Note: Descriptions are shown in the official language in which they were submitted.
2061863
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TITLE OF THE INVENTION
Apparatus for Cutting Adhesive Tape Roll Stocks
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for
cutting adhesive tape roll stocks into product rolls.
An adhesive tape roll is manufactured by cutting
an elongated roll stock into a predetermined length. A
conventional cutting process includes feeding a tape
roll stock to a cutting section, chucking the tape roll
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stock, feeding the chucked stock a predetermined
length, cutting the stock into product rolls, and
discharging the product rolls. In the conventional
apparatus, at most two adhesive tape roll stocks can be
cut at the same time, because of requirements for the
accuracy of the product. In addition, speed of
production can not be increased due to constructional
limitations.
SUMMARY OF THE INVENTION
2 An object of the present invention is to provide
an apparatus which may cut a plurality of adhesive tape
roll stocks at the same time, thereby remarkably
improving the productivity.
According to the present invention, there is
provided an apparatus for cutting adhesive tape roll
stocks comprising a tape stock holding device having a
plurality of shafts each of which is arranged to be
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axially moved so as to be inserted into a corresponding
paper bobbin of a tape stock, a cutting blade receiving
shaft device having axially movable receiving shafts
each of which is to be inserted into the corresponding
bobbin, a chucking device having chucks each of which
is arranged to be axially moved and to grip the
corresponding bobbin and to rotate the bobbin, and a
cutting device having blades for cutting the tape
stocks at predetermined positions on the receiving
shaft.
In an aspect of the invention, each chuck is
provided coaxially with the shaft and has a cylindrical
spindle into which the shaft is inserted, and the
cutting blade receiving shaft device is arranged so as
to remove a cut out tape by retracting the receiving
shaft.
The other objects and features of this invention
will become understood from the following description
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a side view of an apparatus for cutting
an adhesive tape roll stock according to the present
invention;
Fig. 2 is a front view of the apparatus;
Fig. 3 is a side view of a tape stock holding
device;
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Fig. 4 is a side view showing a chucking device;
Fig. 5 is a sectional view of a chuck;
Fig. 6 is a side view of the chucking device;
Fig. 7 is a sectional side view of a cutting
device; and
Fig. 8 is a side view showing a tape roll stock.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figs. 1 and 2, the apparatus of the
present invention has an adhesive tape roll stock
(hereinafter called tape stock) feeder 2, tape stock
holding device 3, chucking device 4, cutting blade
receiving shaft device 5, and cutting device 6.
The tape stock feeder 2 has a rack 10 which engage
with a pinion 11. The frame rack 10 is adapted to be
reciprocated in the stock feeding direction by the
rotation of pinion 11. On the rack 10, six sets of
stock holding devices 12 are provided, arranged in the
feeding direction. Each holder comprises a pair of
arms 13 mounted on a supporting plate 14 secured to the
rack 10.
Referring to Figs. 1 and 3, the tape stock holding
device 3 has a stock 20 slidably mounted on rails 21
and six supporting shafts 22 which are disposed in
parallel. Each shaft 22 is supported by the stock 20
at a rear end thereof and by a cylindrical spindle 35
(Fig. 5) of the chucking device 4. Both ends 25a, 25b
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of a chain 25 which engages with sprocket wheels 26,
27, 28 and 29 are connected to the stock 20. The stock
20 is moved to a stopper 30 by the rotation of the
sprocket wheels 26.
Referring to Figs. 3 to 6, the chucking device 4
has a slide 31 slidably mounted on the rails 21 and a
nut box 32 secured to the underside of the slide 31. A
nut in the box 32 engages with a feed screw 33 which is
connected to a motor 34 through a belt and pulley
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device, so that the slide 31 is reciprocated along
rails 21 by the motor 34. On the slide 31, six chucks
8 are mounted, each of which is provided coaxial with
supporting shaft 22.
Referring to Fig. 5, the chuck 8 has a casing 36
in which the spindle 35 is rotatably mounted by ball
bearings. Four jaws 39 are provided in a front portion
of the spindle at 90 degrees angular displacement.
Each jaw 39 is provided in a slit formed in the spindle
and pivotally mounted on a shaft 44. A rear end of the
jaw 39 engages with a cylindrical cam 42 which is urged
by a spring 40 to a cylindrical piston 41 through a
ball bearing 43. These elements are covered by a cover
46. When compressed air is supplied to a cylinder 41a
to push the cam 42 by means of the piston 41, jaws 39
are contracted by the cam to grip a paper bobbin 7 of a
tape stock 9 at a projected portion 7a, as described
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hereinafter. When the air in the cylinder 41a is
drained, the piston 41 is returned by the spring 40,
and each jaw 39 is expanded by a return spring 45 to
release the paper bobbin 7.
A toothed pulley 37 is secured to the spindle 35.
A timing belt 38 engages with pulleys 37 of all chucks
and with a cylindrical drive pulley 49. The drive
pulley 49 is rotatably mounted in the box 32 and
engages with a spline shaft 47. The shaft 47 is
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operatively connected to a motor 53 through a chain 55
and a clutch 54. Thus, the shaft 47 is rotated by the
motor, so that spindle 35 is rotated through timing
belt 38 and pulley 37.
On the front end of the supporting shaft 22, a
supporting ring 56 is rotatably mounted and a center 58
is slidably mounted in the shaft 22 and biased by a
spring 57 to a projected position.
The cutting blade receiving shaft device 5
includes six shafts 15 each corresponding to the shaft
22. The shaft 15 is slidably supported by a frame 59
and connected to a connecting member 65 which is
slidably mounted on guide shafts 64. On the shaft 15,
a blade receiving member 62 having a receiving chip 61
of sintered hard alloy is pivotally mounted in a recess
and urged by springs 63 to an operating position. The
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connecting member 65 is connected to a piston rod 67 of
an air cylinder 66.
Referring to Figs. 2, 7 and 8, the cutting device
6 has six disk blades 16 each corresponding to the
receiving chip 61. Each cutter blade 16 is secured to
a shaft 16a rotatably supported on a bracket 70.
A blade angle adjusting device is described
hereinafter. The bracket 70 is secured to a swing
plate 71 which is pivotaly connected to an arm 72
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through a pin 73. The arm 72 is secured to a support
plate 74 which is connected to a piston rod 86 of an
air cylinder 87 secured to a machine frame 75. In the
apparatus, the blade edge of the cutter blade 16 is
located on the axis of the pin 73.
A pair of projected ends 71a of the swing plate 71
is pivotally connected to an operating rod 76 through a
lever 77. The rod 76 is connected to a ball screw 78
comprising a screw and balls engaged with the screw. A
pulley 81 secured to the screw is connected to a pulley
82 of motor 83 through a belt 84.
Thus, pulley 81 is rotated by the motor 83, so
that the rod 76 and the lever 77 are axially moved. As
a result, the swing plate 71 is pivoted about the pin
2 73. Thus, the plane of the cutter blade 16 passing the
blade edge thereof is pivoted with respect to the axis
of the pin 73, and hence the blade angle defined by the
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plane of the blade with respect to the axis of the tape
stock 9 is changed.
In operation, when six tape stocks are fed to a
cutting section, shafts lS are inserted into the
corresponding paper bobbins 7 by the operation of
piston rod 67 of air cylinder 66 and shafts 22 and a
front end portion of the spindle 35 are also inserted
into the corresponding paper bobbins 7. The shaft 22
stops when the front end thereof abuts on the end of
the shaft 15 and the center 58 engages with a conical
hole 60. Each chuck 8 is moved to the bobbin 7 and
grips the projected portion 7a on the bobbin 7, and
then rotated to rotate the tape stock 9. Blades 16 are
lowered by the air cylinder 87 and engaged with
rotating tape stock 9, thereby cutting the tape stocks.
Referring to Fig. 8, the cutting of the tape stock
is started from the right side of the tape stock. At
the first cutting designated by the numeral I, an ear
portion 9a is cut off with a width 10 to 15 mm. Since
the ear portion 9a is thin and the blade edge has a
V-shaped section, the blade edge deflects to the right
as the cutting depth increases. As a result, the ear
portion can not be exactly cut off. In order to
precisely cut the ear portion, the blade angle is set
to +3 degrees, namely, the blade 16 is outwardly
inclined. The inclination of the blade is performed by
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the above described blade angle adjusting device.
Since the blade 16 is outwardly inclined, the ear
portion can be precisely cut off without deflection of
the blade. A product tape having a width of 50 mm is
cut off at the blade angle of +1 degree. The last 50
mm product tape 9C is cut off at the blade angle of
-0.5 degrees since the remaining tape stock has a small
width. A product tape 9d having 25 mm width is cut off
at the blade angle of -3 degrees with a remainder 9e.
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When the cutting of product tape 9i (Fig. 1)
finishes, the shafts 15 are moved away from the shaft
22 by the air cylinder 66, so that the cut out tape
products are removed from shafts 15 and dropped. At
that time, the tape stock 9 on shaft 22 is supported by
a pair of supporting rolls 90 (Fig. 1). Thereafter,
shaft 15 are moved again to shafts 22, and chucks 8 are
fed a predetermined stroke. Thus, cutting is repeated.
Product tapes are fed to a belt conveyer 91 through a
shoot 92, and waste tapes 9a, 9e at both ends are
discharged to a belt conveyer 93, where the shoot 92 is
retracted by the operation of a piston rod 94 of an air
cylinder 95.
From the foregoing, it will be understood that the
present invention provides an apparatus which may cut
six or more tape stocks at the same time with accuracy
at high speed.
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While the presently preferred embodiment of the
present invention has been shown and described, it is
to be understood that this disclosure is for the
purpose of illustration and that various changes and
modifications may be made without departing from the
scope of the invention as set forth in the appended
claims.
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