Note: Descriptions are shown in the official language in which they were submitted.
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DUPLEX lay SYSTEM TV USE IN ~opIERJDupl~IcATlNG Michelin
This invention relaxes to automatic electrostatographic duplicating
machines and particularly to the improvement of a duplex tray system having
5 cooperative integration with the operation of one or more copy sheet supply
soys terms.
With the advent of high volume electrostatographic duplicating
machines, the preferred use has been for reproduction runs involving duplex
copying in order Jo save paper and cost -thereof. For very large production
10 runs, considerable space and weight is saved relative to the handling and
storage of copy sets by producing two-sided copies. Some duplicating
machines include in their systems an automatic document handling apparatus,
a copy sheet processor which may be provided with two or more copy sheet
feed devices, and a stitching or stapling apparatus.
These machines may also include a dedicated duplex tray arranged
to receive copy sheets for a transition or buffer period during which time a
predermined number of single-sided copies are produced and are transported
to the tray for temporary storage. Upon completion of the production of this
predetermined number, the sheets are fed from the tray back into the
processor to receive a second image on the second side of the sheets. Such
reproduction machines utilizing this procedure include a document handling
apparatus which is not of the recirculating type but rather provide f or
multiple exposures of a document sheet while the same is held upon an
exposure platen and before another document sheet is placed on the platen, or
before the first document sheet is inverted and brought back to the platen for
similar exposure to its second side, and so on. Copy sheets produced in this
manner are fed into the dedicated duplex tray and fed out again to receive
second images and then transported to a sorter to be collated in copy sets in
accordance with the arrangement of the document sheets being copied.
In the above-discussed manner of copying, it is imperative that the
configuration of the duplex tray be compatible Vito that of the one or more
sheet supply trays. As known in the art and in commercial copiers in the
market, sheet supply trays are usually endowed with edge guides which are
arranged for adjustment to accommodate various sheet sizes. Normally, copy
sheets are fed in a copy processor side edge first, that is, in the direction oftheir shortest dimension. For example, for the YO-YO inch x 11 inch size paper,
the sheets would be fed inn the processor in the direction parallel to the YO-YOinch dimension. In this instance, the supply tray would include guides against
the sheet edges which are spaced apart the longer dimension, and these guides
would be adjustable mounted to permit the affected edges to be placed
5 there against. In the event 8~'2 inch x 13 inch paper is to be used, the operator
would adjust the edge guides to be 13 inches apart. Some supply trays are
even equipped with an adjustable back stop which will accommodate copy
sheets having small variations in their short dimension, such for example, copy
sheets used in some foreign countries.
Due to the recent widespread use of many machines in foreign
countries, or the use of foreign sizes of copy sheets in copiers, it becomes
increasingly important that the operator be aware of these many sizes and
what sizes are in each of the supply trays of the copier being used. The need
for this knowledge is particularly important in the event two-sided or duplex
15 copies are to be produced. In this event, the positioning of the edge guides in
the duplex tray must correspond to positioning of the corresponding edge
guides of the supply tray being used.
In the prior art, US. Patent No. 4,153,242 discloses a two tray
sheet supply arrangement which permits the loading of one tray while the
20 other tray is in its sheet feeding mode. The switching of one tray for another,
however, must be made at the expense of idling the operation of the host
copying machine for the time it takes for an elevator to move each supply tray
vertically sequentially and to move each tray horizontally. There is no
disclosure of side edge guides nor the need f or a structure to accomplish
25 aligned edge guides.
In US. Patent No. 4,00~,957~ an arrangement of two sheet supply
trays is disclosed as having side edge guides f or each tray and a control
arrangement whereby in the event one of the trays runs out of paper during its
use, the other tray will automatically be activated for use to permit
30 continuation of the job for which the first tray was involved. In the event the
second tray contains coy sheet which are of a size not compatible with the
sheet size of the job in progress, the copying machine will be inhibited to
continuing copying operation. There is no disclosure of a duplex tray nor of
any tray which has motor-driven side guides which are automatically postponed
35 to receive copy sheets of a size being fed from a supply tray which has been
adjusted for that size.
In a broader sense, US. Patent No. 3,820,777 discloses the use of a
main sheet supply tray and an auxiliary sheet supply tray, the latter tray to beused for sheets of a size different than that in the main tray. In this
arrangement, if the operator desires to use sheets of another size, rather than
5 stopping the copying machine to change the sheets presently in the machine,
the auxiliary tray may be activated to provide the other size. Manually
actuated switches are provided to permit activation of either of the two trays.
In US. Patent No 3,592,464~ a collection tray for receiving
processed sheets has motor-driven side edge guides arranged to correspond
10 with the positioning of the side edge guides associated with a sheet supply
tray. A plurality of switches are arranged along the path of movement of the
guides for the supply tray one of which is actuated by the guides depending on
the size of paper used, the switch then controlling the motor-driven guides in
the receiving tray in accordance therewith.
Still another US. Patent No. 4,190,246 discloses a circuit which
encodes a plurality of sheet sizes in respective supply trays, determines if anyone of the sizes corresponds to the operator selected sizes, and then
automatically feeds from that tray.
In the Xerox Disclosure Journal, Vol. 1, Number 9/10, September/
20 October, 1976, pages 41-42, a system is disclosed wherein the side guides of a
duplex tray are automatically set when the size of paper in an input sheet tray
is changed or selected thereby insuring that sheets of the size selected will befed into and out of the duplex tray.
The present invention is directed a control and drive arrangement
25 between a duplex tray and one or more supply trays which will automatically
effect the the adjustment of the edge guide members in a duplex tray in
accordance with the previously set edge guide members of either or both of
the supply trays. In accordance with the invention, a common drive is
associated with the edge guide members of both of the supply trays and the
30 duplex tray whereby the adjustment of one or both of the supply trays for a
particular sized paper sheet will automatically adjust the guide members in
the duplex tray in accordance therewith. The common drive mechanism serves
to insure that the necessary adjustments will be accurate with no chance that
relative errors between the respective guides will be able to occur. In
35 addition, by utilizing a common drive mechanism and in accordance with the
present invention, a novel control system, as will be described hereinafter, can
be integrated with the drive operations to insure that
automatic adjustment will take place and that it be in
proper order.
Therefore it is an object of an aspect of
the present invention to condition a copier having duplex
capability with a duplex tray and paper path therefore
for the proper reception of copy sheets therein after
the sheets have received first side images.
An object of an aspect of the present invention is
to insure that the size adjustments of a duplex tray is
compatible with the size of copy sheets being used in a
copier.`
An object of an aspect of the invention is to into-
grate the size adjusting devices of one or more sheet
supply mechanisms with the size adjusting device of a
duplex tray mechanism.
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Other aspects of this invention are as follows:
In a reproduction machine capable of duplex copying and
including a sheet supply tray and a duplex tray arranged for collecting copy
sheets having an image on one side copied thereon, and means adjacent the
duplex tray for feeding the copy sheets out of the duplex tray to receive a second image on the other side, the improvement including
at least one edge guide member associated with the duplex tray
being arranged for movement toward a position adjacent a side edge of copy
sheets to be collected therein,
at least one edge guide member associated with the sheet supply
10 tray being arranged or movement toward a side edge of copy sheets therein
by an operator in accordance with the size of the copy sheets,
drive means operatively associated with said edge guide of the
duplex tray for moving the same in a direction toward said position,
sensing means associated with said edge guide of the supply tray
15 and said drive means for actuating the layer when the said edge guides are not
positioned to receive the same sized copy sheets.
In a reproduction machine capable of duplex copying and
inducting a sheet supply tray and a duplex tray arranged for collecting copy
20 sheets having an image on one side copied thereon, and means adjacent the
duplex tray for fading the copy sheets out of the duplex tray to receive a
second image on the other side, the improvement including
at least one edge guide member associated with the duplex tray
being around or movement toward a position adjacent a side edge of copy5 sheets to be collected therein,
at least one edge guide member associated with the sheet supply
tray being arranged for movement toward a side edge of copy sheets therein
by an operator in accordance with the size of the copy sheets
drive means operatively associated with said edge guide of the0 duplex tray for moving the same in a direction toward said position,
sensing means associated with said edge guide of the supply tray
and having an element movable by said drive means as the same moves said
edge guide of the duplex tray for effecting actuation of the latter when eye
said edge guides are not positioned to receive the same sized copy sheets.
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in a copying machine capable of duplex copying and including a
sheet supply tray and a duplex tray arranged for collecting copy sheets having
an image on one side copied thereon, and means adjacent the duplex tray for
feeding the copy sheets out of the duplex tray to receive a second image on
5 the other side, the improvement including
at least one edge guide member associated with the duplex tray
being arranged for movement toward a position adjacent a side edge of copy
sheets to be collected therein,
at least one edge guide member assodated with the sheet supply
10 tray being arranged for movement toward a side edge of copy sheets therein
by an operator in accordance with the size of the copy sheets,
drive means operatively associated with said edge guide of the
duplex tray for moving the same in a direction toward said position,
sensing means associated with said edge guide of the supply tray
and said drive means,
said sensing means inducing a first sensing member assodated
with said edge guide of the supply tray and a second sensing member adapted
for coincidence with said first member and being movable by the drive means
as the same moves said edge guide of the duplex tray, said sensing means
20 inducing a circuit connected to said drive means and assisted with said
sensing members whereby said drive means is actuated Jo move said edge
guide of the duplex tray in said direction when said sensing member are not in
coincidence.
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In a copying machine capable of duplex copying and including a
sheet supply tray and a duplex tray arranged for collecting copy sheets haying
an image on one side copied thereon, and means adjacent the duplex tray for
feeding the copy sheets out of the duplex tray to receive a second image on
the other side, the improvement inducing
at least one edge guide member associated with the duplex tray
being arranged for movement toward a position adjacent a side edge of copy
sheets to be collected therein,
a least one edge guide member associated with the sheet supply
tray being arranged for movement toward a side edge of copy sheets therein
by an operator in accordance with the size of the copy sheets,
drive means operatively Acadia with said edge guide of the
duplex tray for moving the same in a direction toward said position in response
to a control signal,
sensing means including first and second operative elements
movable relative to each other and when not in coincidence being adapted to
produce said control signal said first element being operatively connected
with said edge guide of the surly tray to be movable therewith, said second
element being operatively connected to said dryer means said drive means
being actable upon said edge guide of the duplex tray to move the same to
said position when said elements are not In Canadians as indicative that the
edge guides are not positioned to receive the same sized sheets.
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in a copying machine capable of duplex copying and including a
sheet supply tray and a duplex tray arranged for collecting copy sheets having
an image on one side copied thereon, and means adjacent the duplex tray for
feeding the copy sheets out of the duplex tray to receive a second image on
5 the other side, the improvement including
at least one edge guide member assodated with the duplex tray
being arranged for movement toward a position adjacent a side edge of copy
sheets to be collected therein,
at least one edge guide member associated with the sheet supply
tray being arranged err movement toward a side edge of copy sheets therein
by an operator in accordance with the size of the copy sheets,
sensing means associated with said edge guide of the supply tray
and arranged for producing a signal when the said edge guides are not
positioned to receive the same sized copy sheets,
drive means operathtely assodated with said edge guide of the
duplex tray for moving the same in a direction Howard said position in response
to said signal, and,
actuating means movable in unison with said edge guide of the
duplex tray toward said position operable to inhibit the production of said
20 signal as being indicative that said edge guides are positioned to receive the
same sized copy sheets.
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These and other objects of the present invention will become
apparent upon considering the following description taken in conjunction with
the accompanying drawing wherein:
Figure 1 is a perspective view of a duplicating system in corpora-
tying an automatic documenting apparatus, a copy sheet processor and sorting
modules to which the present invention is applied.
Figure 2 is a side elevation Al schematic view of the paper path for
sheet feed devices in the duplicating system of Figure l;
Figure 3 is a schematic illustration of the structural integration of
the edge adjustment devices of a duplex tray mechanism and two sheet supply
devices in accordance the present invention;
Figures 4-6 are block diagrams of the control function utilized in
the cooperative actuation of the edge adjusting devices; and
Figure 7 is an electrical schematic of a control system utilized in
the present invention.
For a general understanding of an automatic electrostatographic
duplicating machine to which the present invention may be incorporated,
reference is made to Figure 1 wherein components of a typical electrostato-
graphic printing machine are illustrated. The printing system is preferably of
the xerographic type as one including a xerographic processor 11, a document
handling apparatus 12, and a sorter arrangement 13. Preferably, the printing
system 11, 12 and 13 is the commercial, highly sophisticated embodiment of
the Xerox machine model 9500 which utilizes flash, full frame exposure, for
very high speed production. Document sheet handling and exposure, image
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processing and copy sheet transport/handling ore under control by a machine
programmer and are effected in timed sequence in conjunction with the
machine clock system, and in accordance with the program an operator has
preset in the machine. Further details in this regard are not necessary since
the Xerox 9500 Duplicator operates in this manner and is well known. Details
of the timing relationships and devices, the programmer, and related
structure and events are described in US. Patents Nos. 3,790,270; 3,796,486;
and 3,917,396.
As in all xerographic systems, a light image of an original to be
reproduced, or an electronic facsimile thereof is projected onto the sensitized
surface of a xerographic photosensitive surface to form an electrostatic latent
image thereon Thereafter, the latent image is developed with toner material
to form a xerographic powder image corresponding to the latent image on the
photosensitive surface. The powder image is then electrostatically transferred
to a record material such as a sheet or web of paper or the like to which it
may be fused by a fusing device whereby the powder image is caused to adhere
permanently to the surface of the record material.
The xerographic processor 11 is arranged as a self-contained unit
having all of its processing stations located in a unitary enclosure or cabinet.The processor includes an exposure station at which a document sheet to be
reproduced is positioned on a glass platen 14 for projection onto a photo-
sensitive surface in the form ox a xerographic belt 13. The document or set of
individual document sheets is selectively transported by the document feed
apparatus 12 including a transport belt from the beginning of the set of
sequenced document sheets in the apparatus to the platen f or exposure a
predetermined number of times and then returned on completion of these
exposures until the entire stack has been copied, at which time the document
set handling cycle may be repeated indefinitely as described in US. Patent No.
3,829,082 entitled "Automatic Document Handler" and commonly assigned
with the present invention.
Imaging light rays from the document which is flash illuminated by
suitable lamps are projected by first mirror 20 and a projection lens 21 and
another mirror 22 onto the xerographic belt 15 at the focal plane for the lens
21 along a path indicated by dotted lines 23.
~'~ 35 The xerographic belt 15 is mounted for movement around three
parallel arranged rollers 24, 25, and 26 suitably mounted in the f fame of
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processor 11. The belt is continuously driven by a suitable motor (not shown)
and at an appropriate speed. The exposure of the belt to the imaging light
rays f rum the document discharges the photoconduc live layer in the area
struck by light whereby there remains on the belt an electrostatic image
5 corresponding to the light image projected from the document. As the belt
continues its movement, the electrostatic latent image passes a developing
station at which there is positioned a developer apparatus 27 for developing
the electrostatic latent image. After development, the powdered image is
moved to an image transfer station S whereat record material or sheets of
10 paper was previously separated from either a sheet supply stack on a main
sheet feed apparatus 28 and transported by a conveyor 29 or, from a similar
stack on an auxiliary sheet feed mechanism 30 and transported by a conveyor
31, to the transfer station. A-t the transfer station, the sheet is held againstthe surface of the moving belt to receive the developed powder image
15 therefrom. The sheet is moved in synchronism with the movement of the belt
during transfer of the developed image. After transfer, the sheet of paper is
conveyed to a fusing station where a fusser device 32 is positioned to receive
the sheet of paper for fusing the powder thereon. After fusing, the sheet may
be transported selectively to a catch tray T, the sorter 13, or finisher (not
shown) or the like, or alternatively, transported back into the processor for
duplexing, as will be discussed below.
The reproduction system 1 1, 12, 13 is under control of a pro-
grimmer 35 which permits an operator various options: to turn the entire
system ON or OFF; to program the reproduction system for a desired number
of reproduction sets to be made of an original document set; to select one of
many different copy reduction sizes; and to select whether simplex or duplex
copies are to be made. If the duplex copying mode is selected, each sheet of
copy paper bearing an image and which has passed through the fusing
apparatus issue transported to the top of a dedicated duplex tray apparatus 36
having a bottom sheet feed device 37 by way of a transport 38. The duplex
tray 36 stores one-sided copy sheets until such appropriate time as determined
by the programmer 35. The apparatus 36 commences transporting the stored
sheets by way of a conveyor 39 which again presents the shoe is to the
xerographic belt 15 for permitting the transfer of developed images thereon to
35 the second side of the sheets. The duplex copies are again transported to the fusing apparatus whereat the second sided images are fixed.
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Further details of the processing devices and stations in the printer
system are not necessary to understand the principles of the present invention.
However, a detailed description of these processing stations and components
along with the other structures of the machine printer are disclosed in US.
Patent No. 4,054,380 which is commonly assigned with the present invention
In accordance with the present invention, the electrostatographic
duplicating machine 11, 12 and 13 exemplifying a variety of high speed
duplicating systems with flexible and sophisticated features and options to
10 automatically and conveniently process and manipulate copies or copy sets by
varied selective methods or sequences, for the purpose ox receiving copies in
any of numerous desired quantities, formats, enhancements, and arrangements,
is adapted to be converted to copying document material or the like with many
convenient and automatic control features and much versatility. The resulting
15 apparatus provides the full compliment of processing and manipulating
features for copying from document sheets and document sets.
The illustrated copyin~/duplicating machine contemplates the use
of document counters in an automatic document handling apparatus which are
arranged to count the number of document sheets of a document set in the
20 apparatus to be copied in a reproduction run. This counting may be
accomplished either by automatic precoun~ing as the document sheets are
stewed just prior to copying or concurrently as the documents are being
handled during actual copying. The machine also contemplates the use of
counters in the copy paper supply/feeders and along the copy paper transport
25 path which includes the sorting modules in the duplicating system.
The control of all of the exemplary sheet handling systems
disclosed herein may be accomplished by conventionally activating them by
signals from the controller/pro~rarnmer 35 in response to simple programmed
commands and switch inputs from the copier console selected by the operator,
30 such as selecting the number of copies, selecting simplex or duplex copying,
selecting whether the documents are simplex or duplex, etc. These signals
may conventionally actuate conventional electrical solenoid or cam controlled
sheet deflector fingers and drive motors or their clutches in the selected stepsor sequences as programmed. Conventional sheet path sensors or switches and
bail bars, connected to the controller may be utilized for counting and
keeping track of the positions of documents and copy sheets, as is well known
in the art, and taught in the above and other patents and products. Known
post-collation copying systems utilize such conventional microprocessor
control circuitry and connecting switches for counting the number of dock-
mint sheets as they are exposed a predetermined number of times when placed
5 upon the exposure platen 14, counting the number of completed document set
circulations, and thereby controlling the operation of the document and cop
sheet feeders and inventors, etc.
All references cited herein, and their references, are incorporated
by reference herein for appropriate teachings of additional or alternative
10 details, features and/or technical background.
As shown in Figure 2, the sheet feed apparatus 28, 30 and 36 are in
approximate vertical alignment with the main feed apparatus 28 including a
top feed belt device 41, the auxiliary feed apparatus including a top feed belt
device 43, and the duplex apparatus 36 including the bottom feed device 37.
15 Copy sheets being fed from the main apparatus 28 are transported by the
transport 29 to the transfer station S and then by a vacuum transport 45 to
the fusser 32.
After the fusing operation, the sheets are directed into one of two
paths by a post-fusing transport 46 and a deflector 47, one path conveying the
20 sheets out of the processor 11 and to the sorter modules 13, the catch tray Tor a finishing station, or the other path conveying sheets to the duplex tray 36by way of a turn-around drum 48 working in conjunction with a belt transport
49. Copy sheets fed out of the duplex tray 36 follow the same sequence of
movements as sheets fed from the main tray 28 except that the conveyor 39
25 and the transport 31 direct sheets from the tray 36 to a predetermined point
on the transport 29 so the no machine pitches or cycles are lost when sheets
are fed from the trays alternately
The duplex sheet return path comprises the drum 48/belt 49
conveyor, the transport 38, a pair of guide chutes 50 which directs copy sheets
30 upwardly, a roller/belt transport 51, which finally directs the sheets into the
tray 36. Sheets fed from the duplex tray are transported by a roller pair 52, a
pair of guide chutes 53, the transport 39, a pair of guides 54 to the auxiliary
tray transport 31, thence onto the transport 29 whereby the continued
movement is the same as the sheets fed from the main feeder. As shown in
35 Figure 2, the distance of sheet movement from the auxiliary tray 30 to the
transfer station S is greater than the distance of sheet movement from the
I
main tray 28 to the station S. Similarly the distance of sheet movement from
the duplex tray 36 to the transfer station is greater the the distance of sheet
movement from the auxiliary tray to the transfer station. In order that a
sheet arrives at the transfer station at precisely the same time regardless
5 which of the trays was the source of supply for that sheet, the speeds of the
transports 39, 31 and 29 are approximately the same and the timing of
operation for each of the sheet feeding devices 37, 41 and 43 are arranged so
that a sheet f rum either of the sources will arrive at the registration
-fingers/rollers mechanism 55. More detailed descriptions of the mechanism 55
and the registration window it provides can be found in US. Patent 3,804,507
incorporated herein by reference. With this arrangement, no loss in machine
pitch or cycling is lost regardless of the source of the copy sheets. The
relative speeds of the transports 39, 31 and 29 may vary slightly in ascending
order to prevent buckling of the sheets as they travel Tom one transport to
another.
As previously stated, the three trays 36, 30 and 28 are generally
arranged in vertical alignment relative to one another. With this arrangement,
a unique control system has been devised which directly integrates the
structural components of the trays for the purpose of insuring that the
configuration of the duplex tray is compatible with the configuration of either
source of input paper, that is, the supply trays 28 and 30. The structural/
control system is shown schematically in Figure 3 wherein each of the three
trays are depicted as including left-hand sheet side edge guides 60, 62, and 64,respectively, and right-hand sheet side edge guides 66, 68, and 70, respect
lively. The edge guides 60, 66 for the duplex tray 36 driven by a double helicalscrew 72 arranged with let t-hand and right-hand segments threadedly
received in internally threaded members 74, 75 to which each of the guides 60,
66 are secured, respectively. Upon rotation of the screw 72 in one direction,
the guides will be driven outwardly at same rate while rotation in the other
direction will drive the guides inwardly. The guides 60, 66 are spaced one
from another a distance equal to the length of the copy sheets to be contained
therein, such spacing being effected by a bidirectional asynchronous motor M.
The motor M includes a pulley 76 which is connected by a timing belt 77 to a
double pulley 78 secured to one end of the screw 72.
Each of the supply trays 28~ 30 are provided with the conventional
side edge guide adjusting devices In the case of the main tray 28, the guides
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64, 70 are each connected to a gear rack 88, 90, respectively which are
operatively associated with a gear 92. Rotation of the gear 92 in either
direction will drive the guides 64, 70 toward or away from each other.
Similarly, the auxiliary tray guides 62, 68 are connected to gear racks 94~ 96,
5 respectively, which in turn are operatively connected to a gear 98. The gears
92 and 98 are rotated by suitable manual operated knobs (not shown) by the
operator when copy sheets are placed in trays 28, 30 and the corresponding
edge guides are brought against the ends of the sheets in the conventional
manner. In the alternative, the auxiliary tray guides may be moved manually
by the operator by means other than racks 94, 96 and gear 98.
In accordance with present invention as the operator actuates
either of the gears 92 or 98 to effect movement of the respective edge guides
as the case may be, the edge guides 60, 66 in the duplex tray 36 will likewise
move correspondingly. To this end, the control system as illustrated in Figure
3 includes a helical screw 100 having a pulley 101 secured to one end and
drivingly connected to the pulley 78 by a belt 102. Energization of the motor
M to impart rotation thereof in either direction will cause corresponding
rotation of the screw 100 in unison with the screw 72.
An internally threaded member 104 receives the screw 100 and is
mounted in a manner so that as the screw turns in either direction the member
will travel axially thrilling. The member 104 has secured thereto an upper
flag element 105 and a lower flag element 106, both flags being movable with
the member. The upper flag 105 cooperates with a U-shaped sensing element
107 secured to the right-hand edge guide 68 associated with the auxiliary tray
30. This cooperation involves the movement of the upper end of the flag 105
into and through the U-shaped element 107 to obstruct or to clear the optical
path within an LED/phototransistor device 108 as the member 104 travels
along the screw 100. Similarly, the flag 106 cooperates with a U-shaped
sensing element 109 mounted on the right-hand edge guide 70 associated with
the main tray 28. The flag 106 moves into and through the element 109 as the
member 104 travels along the screw 100 during rotation thereof and serves to
obstruct or to clear the optical path within an LED/phototransistor device 110
mounted within the element 109.
As will be described hereinafter, the LED/phototransistor devices
108 and 110 are connected to the electrical energizing circuit for the motor
M. When either the main tray 28 or the auxiliary tray 30 has been selected
for use as the source of paper supply and the operator has actuated a tray
selection switch on the machine console 35, the motor M will be energized
when the optical path associated with the respective LED/phototransistor
device is clear, that is, unobstructed. For example, as shown in Figure 3,
assuming the operator selected to use the auxiliary tray 30, the edge guides
62, 68 are moved by the operator inwardly or outwardly for the particular size
of copy sheets to be used. The ensuing movement of the guide 68 displaces the
sensing element 107 away from the flag 105 thereby clearing the optical path
within the LED/phototransistor device 108. With the optical path so
unobstructed, the motor M will become energized to effect inward or
outward movement of the edge guides 60, 66 of the duplex tray 36 and
corresponding movement of the member 104 by virtue of the rotation of the
screw 100 produced when the motor M became energized.
This energization will continue until the flag 105 once again moves
into the sensing element 107 and obstructs the optical path of the LED/
phototransistor device 108. Actually in operation, since the flag 105 is
insensitive as to which direction the sensing element 107 has been moved when
the operator caused the guide 68 to be moved, the circuit is devised so that
energization of the motor M will first rotate the screws 72, 100 in a preset
direction in order to drive the guides 60, 66 and the member 104, respectively
into home positions. When the member 104 reaches its home position, -the
direction of rotation of the motor M will reverse to drive the member 104 in
the opposite direction until the flag 105 is positioned within the sensing
element 107 to obstruct the optical path therein to effect deenergization of
the motor M. This latter action will occur as the guides 6G, 66 are spaced
apart the same distance as the guides 62, 68 thereby assuring that the copy
sheets to which the auxiliary tray was fitted will also be accepted by the
duplex tray.
In the event the operator wishes to use the main tray as a paper
supply source, a main tray select switch is actuated on the console 35 and the
gear 92 is rotated in the direction to bring the guides 64, 70 against the sidesof the copy sheets placed in the tray. As shown in Figure 3, the guides 64, 70
are initially positioned further apart than the guides 609 ok of the duplex tray36 and the flag 106 is out of operative contact with the sensing element 109.
Assuming the guides 64, 70 are in their proper position for a particular size
paper, upon actuating the machine "Print" button, the motor I will become
energized to drive the guides 60, 66 and the member 104 to their respect he
home positions. After reaching these positions, the motor will reverse in
direction of rotation to drive the guides 60, 66 apart and the member to the
left until the flag 106 enters the sensing element 109 and obstructs the
LED/phototransistor optical path therein. Upon this occurrence, the motor
will become cleenergized with the guides 60, 66 in positions compatible with
the size of the paper placed in and fed from the main tray 28.
The circuit for the operation of mechanisms described above and
the programming therefore in block diagram form are illustrated in loggers 7
and I respectively. The motor M, as shown in Figure 7, includes a coil
winding W-l which when energized, will drive the side guides 60, 66 of the
duplex tray 36 inwardly, and a second winding W-2 for driving these guides
outwardly when energized. To energize the winding W- 1, a relay R- 1 is
connected in the circuit thereto and Includes a relay contact K-l arranged to
be closed upon energization of a coil C-l which derives its electrical power
from an do source through a limit switch 111. As shown in Figure 3, the limit
switch 111 is arranged to be actuated by the inward movement of the threaded
member 75 as the edge guides 60, 66 for the duplex tray 36 reach their most
inward positions. This actuation causes this switch to open thereby effecting
deenergi~ation of the coil C-l and the consequent termination of the inward
movement of the edge guides 60, 66.
The electrical connection to the coil C-l is grounded through a
trial 112 which is triggered to be conductive by the machine control system
(logic) when the edge guides 64, 70 of the main tray 28, or the edge guides 62,
68 of the auxiliary tray 30, depending upon which of these trays were
selected, are not in alignment with the respective edge guides 60, 66 for the
duplex tray 36. Pus previously indicated, this condition will exist when either
of the flags 105 or 106~ associated wit to the chosen supply tray, is not in
position to intercept the optical path of its sensing element 108 or 109.
After the limit switch 111 has been actuated to its open condition
by the movement of the side edge guide 66 to its most inward position, about
four seconds of time are allowed to elapse by a suitable timer in the machine
logic before a signal from logic energizes an LED 114 for rendering a
phototransistor 115 conductive. The LED 114/phototransistor 115 device
serves as an optical relay in the illustrated circuit. Conduction of this
phototransistor completes the circuit to a trial K-2 from a do source to
21~
energized to drive the guides 60, 66 and the member 104 to their respective
home positions. After reaching these positions, the motor will reverse in
direction of rotation to drive the guides 60, 65 apart and the member to the
left until the flag 106 enters the sensing element 109 and obstructs the
LED/phototransistor optical path therein. Upon this occurrence, the motor
will become deenergized with the guides 60, 66 in positions compatible with
the size of the paper placed in and fed from the main tray 28.
The circuit for the operation of mechanisms described above and
the programming therefore in block diagram Norm are illustrate d in figures 7
and I respectively. The motor M, as shown in Figure 7, includes a coil
winding W-l which when energized, will drive the side guides 60, 66 of the
duplex tray 36 inwardly, and a second winding W-2 for driving these guides
outwardly when energized. To energize the winding Wylie, a relay R-l is
connected in the circuit thereto and includes a relay contact K-l arranged to
I be closed upon energization of a coil C-l which derives its electrical powerfrom an do source through a limit switch 111. As shown in Figure 3, the limit
switch 111 is arranged to be actuated by the inward movement of the threaded
member 75 as the edge guides 60, 66 for the duplex tray 36 reach their most
inward positions. This actuation causes this switch to open thereby effecting
I deenergizatiorl of the spoil C-l and the consequent termination of the inward
movement of the edge guides 60, 66.
The electrical connection to the coil C-l is grounded through a
trial 112 which is triggered to be conductive by the machine control system
(logic) when the edge guides 64, 70 of the main tray I or the edge guides 62,
68 of the auxiliary tray 30, depending upon which of these trays were
selected, are not in alignment with the respective edge guides 60, 66 for the
duplex tray 36. As previously indicated, this condition will exist when either
of the flags 105 or 106, associated with the chosen supply tray, is not in
position to intercept the optical path of its sensing element 108 or 109.
After the limit switch 111 has been actuated to its open condition
by the movement of the side edge guide 66 to its most inward position, about
four seconds of time are allowed to elapse by a suitable timer in the machine
logic before a signal from logic energizes an LED 114 for rendering a
phototransistor 115 conductive. The LED 114/phototransistor 115 device
serves as an optical relay in the illustrated circuit. Conduction OX this
phototransistor completes the circuit to a trial K-2 from a do source to
-14-
phototransistor device 108 will be conductive thereby completing the energize
in circuit to the trial K-2 as was the case for the selection of the main tray.
When the flag 105 enters the sensing element 107 to cause interception of the
optical path therein, the transistor 124 becomes non-conductive and the
5 circuit to the trial K-2 is spelled to terminate operation of the motor I As
in the case with the main tray, a pulp resistor 125 and a diode 126 are
connected in the tray select circuit to inform the machine control that the
selected tray has its edge guides compatible with the edge guides of the duplex
tray. Continued operation of the machine may now be provided now that this
10 interlock condition has been eliminated.
rum the foregoing it will be appreciated that the present
invention insures that the duplex tray in a copier having one or more supply
sources will always be compatible to the particular source in regard to sheet
size and that in the event the copier is endowed with automatic tray selection,
the supply tray which is automatically activated as a supply source after the
originally operated tray experiences a low or no paper condition, the second
supply tray must be compatible with the duplex tray as to sheet size or the
copier will be inhibited from continued operation.
While the invention has been described with rev erroneous to the
20 structure disclosed, it is not confined to the details set forth, but is intended
to cover such modifications or changes as may come within the scope of the
following claims.
