Note: Descriptions are shown in the official language in which they were submitted.
This device relates to a reliable loading mechanism having
relatively simple construction, ~or winding up a tape drawn out by loading,
into a cassette when unloading. The device makes it possible to rewind
the loaded tape into the cassette without forcing it.
In accordance with the invention there is provided a loading
mechanism for a video tape recorder, having a plunger turned-on by operat-
ing a playback or video recording button; a slide plate slidable in the
operating direction when the plunger is actuated; an idler for driving a
take-up reel cooperatively through the slide plate and a spring; a gear
mechanism which is operated by the playback or video recording button to
draw a video tape out of a cassette at least through the pinch roller and
put the tape Oll the rotary head or the like, allowing the pinch roller to
press-contact with the capstan and load the roller for running the tape,
and is operated by at least the stop button to restore the pinch roller
toward the cassette, to thereby change it over to unloading; a swingable
plate formed at the gear mechanism and operating when changed over to un-
loading; and a swingable board operating in association with the pin formed
at the swingable plate, thereby restraining the slide plate from restoring,
when said plunger is turned-off by at least operating said stop button to
put said slide plate in condition of being restorable and changed-over to
unloading. ~lence, following restoration of the pinch roller toward the
cassette, the drawn-out tape may be rewound into the cassette, through the
take-up reel.
The error prevention mechanism of the device, which is applied to a
video tape recorder, will be described with reference to the drawings in
which:
Figure 1 is a general view;
6~:
Figures 2 through 4 are views of explanation for a cassette;
Figure 5 is a view of explanation for function when the cassette is
set to load the tape in playback condition;
Pigure 6 is a view of explanation for a gear train;
Figure 7 is a sectional view of a support gear at a first loading
gear ring in condition of being fixed to the chassis.
Figures 8 through 11 show switching conditions of gear ~rain;
in which:
Figure 8 is a view of explanation of loading function;
Figure 9 is a view of explanation of operation at an end of loading;
Figure 10 is a view of explanation of unloading operation;
Figure 11 is a view of explanation of operation at an end of un-
loading.
Figures 12 and 13 are views of explanation of operating condition
of each mechanism when a pinch ro].ler press-contacting plunger operates and
stops;
Figures 14 and 15 are views of explanation of a guide for the pinch
roller;
F~gure 16 is a side view of a draw-out pin;
Figure 17 is a view partiall~ showing rapid feed condition;
Figure 18 is a partial view of rewinding condition;
Figure 19 is a view of explanation of brake member;
Figures 20 and 21 are views of a lever mechanism for control buttons;
Figures 22 and 23 are views of explanation of operation,-showing
playback control locked condition in Figures 20 and 21;
Figure 24 is a view of explanation of a lock mechanism for control
buttons in non-control condition; and
-- 2 --
~6i~
Figures 25 and 26 are views of explanation of operation in Figure 24.
Figures 6 and 7 precede ~igure 5 in the drawings.
An embodiment of the invention will be detailed with reference to
the drawings. Figure 1 shows the whole mechanism not in operation, in which
1 is a group of control buttons, 2 is a ~eeder reel, 3 is a take-up reel, 4 is
a pinch roller, 5 is a tape take-out pin, 6 is a rotary head, 7 is a voice
control head, 8 is a whole width erasing head, 9 is a voice erasing head, 10 is
a capstan, 11 is a flywheel, 12 is a first loading gear ring pivotally support-
ing the pinch roller 4, 13 is a second loading gear ring provided with the
tape take-out pin 5, 14 is a plunger to press-contact the pinch roller 4 with
the capstan 10, 15 is an idler for driving the take-up reel 3, 16 is a rapid
feed transmission gear, 17 is a return transmission gear, 18 is a motor, 19
is a gear train for transmitting rotation of motor 18 to the first loading
gear ring 12 and second loading gear ring 13, and 20 is an automatic stopping
plunger. Detailed construction and relative functioll of each of the above
will be described as follows.
A cassette 21 for video tape used in this embodiment is the smallest
at present and is about 106mm wide, 68 mm long, and 12 mm thick. A magnetic
video tape 24 wound onto a pair of tape reels 22, 23 are housed within the
cassette 21 as shown in a plan view of Figure 2, a bottom view of Figure 3,
and a side view of Figure 4. The cassette 21 has at its tape take-out face
of the front edge an opening-and-closing lid 25 pivo*ed at 26 thereto, the
lid 25 being closed tight in normal by a spring or the like. The casset-te 21
also, as shown in Figures 3 and 5, is provided at the front bottom with a
recess 27 accommodating therein the pinch roller 4 and a recess 28 accommodat-
ing the tape take-out pin 5. Figure 4 shows the cassette 4 set on a cassette
mount base 29 located above the reels 2, 3. The cassette base 29, as shown
-- 3 --
in Figure 5, has cassette level keeping pieces 30, 31, 32 and 33, the pieces
32, 33 forming abutments 34, 35 for the lid 25. When the cassette 21 is set
on the base 29 as shown in Figures 4 and 5, the lid 25 abuts at its foremost
end against abutments 34, 35, thereby being kept as is opening at the front.
At this time, the pinch roller 4 pivoted to the first loading gear ring 12 and
the tape take-out pin 5 formed at the second loading gear ring 13 are posi-
tioned within the recesses 27, 28. In order to pull-out the tape 24 shown by
the solid line in Figure 5 and keeping it in loading condition (video recording
or regenerating condition), the pinch roller 4 and take-out pin 5, as shown
by the phantom line, are positioned at the rear of tape 24 within the recesses
27, 28 respectively. Then, the first and second loading gear rings 12 and 13
are rotated in the opposite directions to move the pinch roller 4 and take-out
pin 5 in the loading direction, thereby drawing out the tape 24. Hence, the
tape 2~ applies loading to electric elements, such as rotary head 6, voice
control 7, whole width erasing head 8, and voice erasing head 9, and further
press-contacts with the capstan 10 through the pinch roller 4, whereby feed
rotation of capstan 10 by the motor 18 and windîng-up of the take-up reel 3
through idle roller 15 carry out tape drive for video recording and re-
generation.
~0 Rotations of the first and second loading gear rings 12 and 13
necessary for the above loading by tape 24 are carried out by the gear train
19 connected properly to the motor 18.
In detail~ a basic gear 36, as shown in Figure 6, is provided at the
rotary shaft of motor 18 and connected to two gears 37, 38 in the relationship
of being properly switched thereto, the gears 37, 38 being in neutral position.
One gear 37 is rotatable in normal and connected to a larger gear 39, and the
other gear 38 for reversing is connected to the larger gear 39 through an
~ 4
intermediate gear 40. Also, the gear 37 is pivoted to a swingable plate 43
of T-like shape and having pins 41, 42 at both opposite ends thereof, the
plate 43 being pivoted at an intermediate portion between both ends to a shaft
44 of larger gear 39, the pin 41 being biased by a spring 45 in the direction
of connecting the gear 37 with the basic gear 36. The gear 38 is pivoted
to one end of a rocking plate 47 of L-like shape and having at the other end
a pin 46, the plate 47 being pivoted at its intermediate portion to the shaft
44 o~ larger gear 39 thereby biasing the pin 46 by a spring 48 in the direc-
tion of connecting the gear 38 with the basic gear 36. Thus, the two rocking
plates 43, 47 are switched to transmit the normal and reverse rotations to
tl-e larger gear 39. The larger gear 39 is integral with a pinion 49 whose
rotation is transmitted to a speed change gear 50 and a pinion 51 integral
therewith.
On the other hand, the first loading gear ring 12 has at its inner
periphery a geared groove and is supported radially by support pinions 52,
53 and 54 in mesh with the geared groove. One support pinion 52 is integral
with a gear 55 in mesh with the pinion 51 driven by the motor 18 through the
gear 37 or 38, whereby normal or reverse rotation of motor 18 is transmitted
to the first loading gear ring 12. Upon rotation of first loading gear ring
~O 12, another connecting gear 56 in mesh with the inner geared groove at the
ring 12 is rotated. Then, reverse rotation of first loading gear ring 13 is
transmitted through a pinion 57 integral with the gear 56 to the second load-
ing gear ring 13 provided rotatably onto the outer periphery of rotary head
6. ~lence) the pinion 37 is switched to rotate the first and second loading
gear rings 12 and 13 in the opposite dîrection as shown by the arrows, there-
by driving the pinch roller 4 and take-out-pin 5 out of the recesses 27, 28
following the rotations of rings 12, 13, thus drawing the tape 24 out of the
-- 5 --
G,2
cassette 21 toward the opposite peripheral sides of rotary head 6. The pinch
roller 4 press-contacts the tape 24 with the capstan 10 by means of the
plunger 14 turned-on by a mechanism to be hereinafter described, at which
time the tape 24 is put onto the pinch roller 4 side from the taken-out side
by pin 5 successively through the whole width erasing head 8, rotary head 6,
voice erasing head 9, voice control head 7, and capstan 10. In addition, the
support gears 53, 54, which support the first loading gear ring 12 at the
inner periphery thereof, are, as shown in Figure 7, fixed to gear shafts 59
rotatably supported to a press-fit member 58 fixed to a chassis C respectively.
A mechanism for a cessation of rotation at a finish of loading or
unloading by the first and second loading gear rings, comprises semicircular
recesses 60, 61 of different depths and provlded at the outer periphery of
ring 12, and two rollers 62, 63 insertable into the recesses 60, 61 respec-
tively as shown in Figures 8 through 11. A cessation when loading ls finished,
as shown in Figure 9, is carried out by the roller 63 fit into the recess 61.
In detail, the roller 63 is mounted rotatably on one end of a rocking pla~e
66 which is pivoted to a spindle 64 and biased by a spring 65 to always press-
contact the roller 63 with the outer periphery of ring 12, the rocking plate
G6 being angled to approach the ring 12 in the loading direction and to escape
~0 from the ring 12 in the unloading direction. A V-like shaped recess 67 is
formed at the rocking plate 66, which engages with the pin 41 at one end of
T-like shaped rocking plate 43 provided at the normal rotation gear 37. When
the roller 63 is fit into the recess 61 from the outer periphery of ring
12 in the loading condition shown in Figure 8, the rocking plate 66 swings
in the direction of the arrow in Figure 9 and moves the pin 41 at rocking
plate 43 through one side of V-like shaped recess 67 against the spring 45 to
thereby swing the rocking plate 43 around the shaft 44, thus disengaging the
-- 6 --
gear 37 from the basic gear 36. Ilence, the ring 12, which is rotated in
normal through the gear 37, stops its rotation in the loading direction.
The ring 1~, when the unloading is finished, stops its rotation by
the roller 62 fit into the recess 60. In detail, the roller 62 is provided
rotatably at one end of a rocking plate 70 which is pivoted 'co a shaft 68 and
biased by a spring 69 to always press-contact the roller 62 with the outer
periphery of ring 12, the rocking plate 70 being angled to move the roller 62
toward the ring 12 with respect to the unloading direction and to escape
from the ring 12 in the loading direction. Also, the rocking plate 70 has at
its other end a hook 71 which corresponds to the pin 46 at L-like shape~
rocking plate 47 provided at the reverse gear 38. When the roller 62 in un-
loading condition shown in Figure 10, is fit into the recess 60 from the outer
~eriphery of ring 12, the rocking plate 70 turns in the direction of the arrow
in Figure 11 to pull the pin 46 at rocking plate 47 to thereby turn the
rocking plate 47 around the shaft 44, thus disengagîng the gear 38 from the
basic gear 36. Consequently, the ring 12 reversely rotated through the gear
38 stops its rotation in the unloading direction. The recess 60 is so posi-
tioned that when the pinch roller 4 and take-out pin 5 in association relative
therewith are positioned within the cavities 27, 28 at the cassette 21, the
roller 62 is fit into the recess 60. The recess 61 is so positioned that when
the pinch roller 4 and take-out pin 5 turn to reach the loading finish posi-
tions respectively, the roller 63 is fit into the recess 61.
Furthermore, the normal rotation gear 37 and reverse rotation gear
38 are mutually switched by a regeneration or playback button (PLAY) and video
recording button ~REC) in a group 1 of operating buttons of self-locking type
to be hereinafter described. The button (PLAY) or (REC) is operated to move
a common slide plate 74 through slide plates 72, 73, the slide plate 74 being
-- 7 --
pulled by a spring 75 against the operating direction and having at the tip
a cam 76. The cam 76~ as shown in Figure 11, has cam faces 77, 78 different
in level, the cam faces 77, 78 abutting against the pin 42 at the T-like
shaped rocking plate 43 at normal rotation gear 37. When the cam face 77
restricts the pin 42 against the spring 45, in other words, in condition of
not operating the buttons 72, 73, the gear 37 disengages from the basic gear
36 to transmit no rotation to thé rings 12, 13. However, when the but~on 72
or 73 is operated, the common slide plate 74 moves to abut the cam face 78
against the pin 42, whereby the T-like shaped rocking plate 43 slightly turns
through the spring 45 and the normal rotation gear 37 meshes with the basic
gear 36. Hence, the motor 18 rotates both the rings 12, 13 through the trans-
mission gear train to move the pinch roller 4 and take-out pin 5 in the load-
ing direction.
At the other edge of common slide plate 74 are formed stepped cam
faces 79, 80, which abut against the pin 46 at L-like shaped rocking plate 47
carrying the reverse rotation gear 38. When the cam face 79 restricts the
pin 46 against the spring 48, in other words, in condition of operating the
button (PLAY) or (REC), the gear 38 disengages from the basic gear 36. When
the stop button (STOP) is operated or automatic stopping mechanism acts, in
condition of loading as shown in Figure 12, the regeneration button ~PLAY)
or video recording button (REC) is released through -the self-locking mechanism
in control button group 1, and simultaneously the common slide plate 74
returns through the spring 75. Then, the pin 46 at L-like shaped rocking
plate 47 moves from the cam face 79 to the cam face 80 and abuts thereagainst
and the plate 47 slightly turns through the spring 48 to mesh the reverse
rotation gear 38 with the basic gear 36, thereby transmitting reverse rotation
L6~
to the rings 12, 13 to be in the unloading condition. In addition, when the
unloading is finished to fit the roller 62 into the recess 60 as foregoing,
the pin 46 at the L-like shaped plate 47, even when abutting against the cam
face 80, is restricted by the hook 71 at rocking plate 70, whereby the reverse
rotation gear 38 is not engaged with the basic gear 36, thus transmitting no
rotation to the rings 12, 13.
Upon operation of regeneration button (PLAY~ or video recording
button (REC), the normal rotation gear 37 engages with the basic gear 36 thro-
ugh the cam face 76 at common slide plate 74 and associates with the rings 12,
13 to be in loading condition. When the loading is finished and the pinch
roller 4 and take-out pin S move together with the tape 24 so as to reach the
fi~ed position as shown in Figure 12, the roller 63, as shown in Figure 9, is
fit into the recess 61 at ring 12 to move the normal rotation gear 37 away
from the basic gear 36 to thereby stop the loading. At the rocking plate 66
carrying the roller 63 is provided an actuator 82 for turning-on a switch
81 to actuate the plunger 14, so that the plunger is actuated upon the stop-
ping of loading. At the utmost end of plunger l4 is provided a pusher 83
turnable around its spindle 84, the pusher 83 urging the pinch roller 4 against
the capstan 10 through a contact surface 85 and being connected in association
with an elongate slide plate 86 through a connector 87, the slide plate 86
engaging or disengaging the idler 15 with or from the take-up reel 3 in order
to transmit thereto rotation of regeneration or video recording. The loading
s*arts from condition in Fi`gure 1 and the plunger is actuated as shown in
Figure 12, then the contact surface 85 pushes the pinch roller 4 spindle,
thereby press-contacting roller 4 with the capstan 10 to convey the tape 4
sandwiching it therebetween.
A tongue 88 is provided at the pusher 83 and abuts against one end
of connector 87. The connector 87 swings~ around its spindle 89 and connects
at the other end with one rising 90 at the elongate slide plate 86 and
associates therewith. The idler 15 is provided at an arm g2 swingable around
a spindle 91, the arm 92 being opposite at its edge 93 to the other rising 94
of slide plate 86 through a spring 95. Hence, when the plunger 14 is turned-
on, the idler 15 abuts against a smaller diameter portion 96 integral with the
lower portion of take-up reel 3, following the movcment of slide plate 86 in
the direction of the arrow, thereby transmitting rotation in the take-up
direction to the reel 3 through a drive mechanism to be hereinafter described.
IO Next, when the regeneration or video recording is finished and the
stop button ~STOP) is operated, the plunger is turned-off to release the pinch
roller 4 from press-contact with the capstan 10. The pin 42 at the T-like
shaped rocking plate 43 carrying the normal rotation gear 37 which disengages
from the basic gear 36 through the roller 63 fit into the recess 61, is
abutting against the cam face 77 at the common slide plate 74 which returns
by the stop button (STOP), thereby keeping the gear 37 in disengagement from
the basic gear 36. Simultaneously, the pin 46 at L-like shaped rocking plate
47 carrying the reverse rotation gear 38 abuts against the cam face 80 at the
common slide plate 74, because the roller 62 is positioned on the outer peri-
~0 phèry of ring 12 ~eing not fit into the recess 60) and the hook 71 at the
rocking plate 70 is released from the pin 46. At this time the reverse
rotation gear 38 meshes with the basic gear 36 to put the ring 12 in unloading
condition. ~lowever even when the plunger 14 is turned-off to put the ring in
unloading condition, the loading tape 24 must be wound-up within the cassette
21. }lence, the elongate slide plate 86, as shown in Figure 13, is provided
with a rocking plate 97 which restrains the plate 86 from its return even
when the plunger 14 is turned-off, and which keeps the -idler 15 in condition
- 10 -
z~
of press-contacting with the sma.ller diameter portion 96 at take-up reel 3.
The rocking plate 97 is pivoted at its intermediate portion onto a spindle g8,
is inserted at one end between two risings 99, 100 formed at the elongate
slide plate 86, and abuts at the other end against the pin 42 at L-like shaped
rocking plate 47. In the unloading condition of meshing the reverse rotation
gear 38 with the basic gear 36 as foregoing, the pin 46 at rocking plate 47
urges the other end of rocking plate 97 to turn the plate 97 around the spindle
98 and the other end of plate 97 checks through the rising 99 the slide plate
86 which tends to return by turn-off of plunger 14. As a result, even during
the unloading, the idler 15 abuts against the smaller diameter portion 96 so
as to allow the take-up reel 3 to wind up the tape 4.
Furthermore, a mechanism for placing the tape 4 on the rings 12, 13
will be detailed. The pinch roller 4, as shown in Figures 14 and 15, is
pivoted onto a spindle 103 at one end of arm 102 pivoted at its other end
through a spindle 101 to a cylinder 113 fixed to the ring 12. A pin 104 is
provided at the foremost end of arm 102. A small arm 106 is pivoted at its
one end to an intermediate portion of arm 102 through a spindle 105 and has at
the other end a tapered roller 107. The arm 102 fixedly supports a spindle
101 which is mounted vertically movably to the cylinder 113 through a spring
108 and supports the pinch roller 4 to escape radially outwardly (in the
arrow direction~ from the ring 12. The tapered roller 107 similarly is formed
to escape radially outwardly of the ring 12 through a spring 9. Also, a load-
ing guide 110 properl~ fixed to the chassis C is provided in the loading rack
of pinch roller 4, so that the pinch roller 4 and tapered roller 107, which
are biased radially outwardly of ring 12 through the springs 108, 109 in the
escaping direction, abut against the guide roller 110 and are guided therewith
from the starting point of loading to the terminus thereof. In the loading
-- 11 -
track of pinch roller 4) a guide plate 112 having a tapered surface abutting
against the upper portion of spindle 101 for fixing the arm 102, is fixed
to a head base 113a carrying heads 7, 8 and 9. Thé tape 4, which is pulled
out by pinch roller 4 simultaneously with the loading, is placed on and along
a tape guide groove 115 which is slanted corresponding to a head cap 114 at
the cylinder portion of rotary head 6. At this time; the upper end of spindle
101 is guided along the tapered lower surface of guide plate 112 corresponding
to the guide groove 115, pinch roller 4 carrying the tape 4 moves downward
against the spring 108 between the arm 102 and the cylinder 113, and the tape
4 is placed slantwise on the tape guide groove 115 at rotary head 6 from the
side of take-out pin 5 moving relative to pinch roller 4, which is for the
purpose of recording video signal slantwise on the tape 4, The tapered
roller 107, which is provided at the small arm 106 pivoted to arm 102 at pinch
roller 4, abuts against a pin 116 formed at the terminus of loading as shown
in Figures 5 and 12, small arm 106 turns the spring 109, and tapered roller
107 carrying the tape 24 allows the tape to escape outwardly, so that the
tape 24 may not back-scrape against the tape guided toward rotary head 6 and
heads 7, 8.
The take-out pin 5, as shown in Figures 14 and 16, is pivoted onto
the upper end of spindle 118 provided on an arm 117 extending from the second
loading ring 13, and has a rocking plate 120 pivoted to a spindle 119 fixed
to the arm 117. The rocking plate 120 is pivoted to arm 117 through the
spindle 119 slightly shifted toward the ring 13 side with respect to the take-
out pin, and is provided outwardly from the pin 5 with a tape pin 124. The
plate 120 is shaped to surround the spindle 118 outwardly thereof and toward
the tape pin 124 side through a curved portion 123, and has at the outer end
a projection 122 abutting against a pin 121 formed at the position where the
- 12 -
pin 121 is opposite to the pin 116 at the terminus of loading. Also, the
plate 120 allows the curved portion 123 to always abut against the periphery
of spindle 118 at the take-out pin 5. When the pin 5 moves until the loading
terminus, the projection 122 at the utmost end of rocking plate 120 abuts
against pin 121, so that the plate 120 turns against the spring 124', whereby
the pin 124 carr~ing the tape 24 leaves the take-out pin 5, thus preventing
the tape 24 from back-scrape against the tape guided toward the rotary head
6 and head 8.
Hence, the tape 24, as shown in Figure 5, is drawn out of the reels
22 and 23 within the cassette 21 and loaded toward the tape reel 2 at take-up
reel 3 from the tape reel 23 fit to the feed reel 2 shaft successively through
tlle pin 124, take-out pin 5, whole width erasing head 8, rotary head 6, voice
erasing head 9, voice control head 7, between capstan 10 and pinch roller 4,
pin 104, pinch roller 4, and tapered roller 107.
Next, tape rapid feed and rewinding mechanism is shown in Figures
17 and 18. A rapid feed button ~FF) is operated to be self-locked. A rapid
feed transmitting gear 16, which is pivoted to a slide plate 125 between the
pair of reels 2 and 3, engages with a gear formed at the outer periphery of
take-up reel 3 as shown in Figure 17, thereby rotating the take-up reel 3 in
the winding-up direction through the gear 16 rotatable through a drive
mechanism to be hereinafter described, the slide plate 125 being biased in
the direction of restoration through a spring 127.
The rewind button (REW), when operated, is self-locked, and a rewind-
ing transmitting gear 17, which is pivoted to a slide plate 128 between the
pair of reels 2 and 3, engages with a gear at the outer periphery of feed reel
2 and with the rapid feed transmitting gear 16 as shown in Figure 18, thereby
transmitting to the feed reel 2 through the rewinding gear :l6 the rotation
- 13 -
~:~6~
of rapid feed gear 16 rotatable through a drive mechanism to be hereinafter
described, thus rotating the feed reel 2 in the rcwinding direction, the slide
plate 128 being biased in the return direction through a spring 130.
The rapid feed transmitting gear 16 and rewinding transmitting
gear 17 move between the pair of reels 2 and 3, the gear 16 being coupled with
the take-up reel 3, the gear 17 being coupled with the gear 16 stationary and
with the feed reel 2. Hence, pivot points of gears 16, 17 and locations of
slide plates 125, 128 are set to carry out ~he above operations. The reels
2, 3 and gear 17 are made from synthetic resin and gear 16 is metallic, where-
by the metallic gear 16 directly driven by the drive source is rotating to
mesh with the gear of stationary reel 3 and gear 17 to thereby keep a good
gear train. The gear 17 on the slide plate 125, when the rewind button (REW)
is pushed, slightly moves against the spring 127, and simultaneously the gear
17 is coupled with the gear of reel 2, thereby improving the connection
between the gears 16 and 17.
The slide plates 125, 128 associate at the tips thereof with a brake
member 131, which is of T-like shape, has at both ends elastic members 132,
133 press-contacting with the smaller diameter portions 96, 96a of reels 2,
3 respectively, and is slidable in the operating direction through a slot 135
into which a pin 134 fixed to the chassis C is inserted. A spring 138 wound
at its center onto the pin 134 is retained at both ends to pins 136, 137 pro-
jecting from the both ends of T-like shaped member 131, thereby biasing the
member 131 in the return direction ~the braking direction~. The top 139 of
T-like shaped member 131 abuts against the tips 140, 141 of slide plates
125, 128, so that when the slide plate 125 or 128 abuts against the top (when
in rapid feed or rewinding~, the member 131 slides against the spring 138 to
move the elastic members 132, 133 apart from the smaller diameter portions 96,
- 14 -
æ
96a at reels 2, 3J thereby releasing the reels 2, 3 from braked conditions.
An idle cutout 142 and a fixture 143 are formed at a root of T-like
shaped member 131, so that a pin 144 at the chassis C may be properly switched
between the cutout 142 and the fixture 143. In detail, a rising 145 is pro-
vided at one side edge of member 131 and associates with the rising 150 formed
halfway of the elongate slide plate 86, through two rocking plates 148, 149
swingable around spindles 146, 147 respectively as shown in Figure 13. Hence,
during regeneration, video recording and unloading, the rising 150 at the
slide plate 150 in an active condition, pushes the rising 145 at braking
member 131 through the rocking plates 148, 149, whereby the member 131 rotates
around the pin 134 in the arrow direction to contact the pin 144 with one wall
at the cutout 142, at which time the elastic member 132 leaves the smaller
diameter portion 96 and 133 abuts against the smaller diameter portion 96a.
Thus, while braking the reel 2, the reel 3 is released to be rotatable by the
idler 15 to thereby wind-up the tape 24 in tension.
Furthermore, another brake member 151, as shown in Figure 1, is
provided for the reel 2, which is pivoted at its intermediate portion, is turn-
able at one end through a tongue 152 toward the arm 117 carrying the take-out
pin 5 to thereby release the reel 2 from braking, and forms at the other end
a tongue 153. The tongue 153 engages with one end of a cassette mounting
case (a case pivoted to the chassis, housing the cassette and opening and
closing on the cassette base 29) not shown, so that the brake member 151, when
the unloading ends, turns to disengage the tongue 151 from the cassette mount-
ing case to thereby keep the case openable. In other words, during loading,
the member 151 is kept in the aforesaid engagement to lock the case not to
open.
The group 1 of control buttons is of self-locking type, which will
- 15 -
be described according to ~igures 20 through 23. Bracket members 154, 155
are fixed on the chassis through screws. A single lever shaft 156 is hori-
zontally mounted between the bracket members and pivotably supports at regular
intervals operating levers 157, 158, 159, 160 and 161 for the rewind button
(REl~), rapid feed button ~FF), stoppillg button (STOP), regeneration button
(PLAY) and video recording button (REC). To the bracket members 15~, 155 are
pivoted retainers 162 each of L-like type as shown ~n Figure 22~ a partially
sectional view of the regeneration button (PLAY). A spring 163 is wound onto
the pivot position of the retainer 162 and is seated at one end on the bracke~
member 155 and engages at the other end with the lower surface of retainer
162, thereby always biasing the retainer 162 to be turnable clockwise. A
spring 16~ is wound onto the lever shaft 156 and engages at one end with the
regeneration lever 160 and at the other end with a proper spring seat 165,
thereby biasing the regeneration lever 160 always in the not-operating con-
dition. The regeneration lever 160 and other levers 157, 158, 159 and 161, as
shown in Figure 21 have projections 166 integral with the levers respectively,
so that when the respective levers 157 through 161 are active, the projec~ion
166 abuts against the retainer 162 through a slide face 167 to keep each lever
in operating condition, and when the levers are inactive, the retainer 162
engages at its tip with a stopper 168 at the respective levers 157 through
161.
An actuator 169a is provided at the respective levers 157 through
161 and abuts against a leaf spring 169 provided at an operating end of each
of the rewinding slide plate 128, rapid feed slide plate 125, regeneration
slide plate 72 and video recording slide plate 73. When each of levers 157
to 161 is operated, the leaf spring 169 allows the respective slide plates
12~, 125, 72 and 73 to slide and to be locked in operating condition. The
- 16 -
L16Z
reason for interposing these leaf sprlngs 169 is to absorb a stroke difference
because the actuator 169a is larger in stroke than the respective plates 128,
125, 72 and 73, thereby ensuring action of actuator 169a. In addition, the
utmost end of lever 159 for stopping button (SIOP) (the-utmost end correspond-
ing to the actuator 169a) abuts against a stopper 170 not to engage the tip of
retainer 162 with a projection (corresponding to the projec-tion 166) at the
chassis C, whereby the stopplng lever (STOP) only is no~ locked.
~ hen the regeneratlon sllde plate 72 or video recording sllde plate
73, is ln operatlng condition, the rewinding slide plate 128 and rapid feed
slide plate 125, i.e., rewinding button (REW) and rapid feed button (FF), are
locked not to operate. Conversely, when the plate 128 or 125 is in operating
condition, other slide plates 72, 73, i.e., regeneration button (PLAY) and
video recording button ~REC), are locked not to operate. In detail, projec-
tions 171, 172, 173 and 174, as shown in Figure 24, are provided from the
respective plates 128, 125, 72 and 73 at its slde of operating the respective
levers 157, 158, 160, 161. Whlle, a lock plate 179 having tapered faces 175,
176, 177 and 178 abuttlng against the projections 171 to 174 respectlvely is
provided to be slidable through elongate slots 180, 181 and pins 182, 183 on
the chassis in the direction of intercrossing the sliding direction of the
respective levers 157, 158, 160 and 161. Also, the lock plate 179 has at
its central portion a projection 184 which keeps the plate 179 neutral and is
positioned together with another pin 185a on the chassis within a U-like shap-
ed spring 186 wound onto a pin 185. Referring to Figure 25, for example, when
the regeneration button IPLAY) astuates the lever 160, the projection 173 at
slide plate 72 abuts against the tapered face 177 of lock plate 179 to move
the plate 179 leftwards and bias it in the return dlrectlon through a spring
186. The video recording button (REC) is the same as the above. At this time,
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the projections 171, 172 abut against the stopp:ing faces 187, 188 to restraln
the levers 157, 158 from moving in the operating directions respectively.
On the contrary, when the rapid feed button (FF) actuates the lever 158, the
projection 172 at slide plate 125 abuts against the tapered face 176 at the
lock plate 179 to thereby move the plate 179 rightwards and bias it in the
return direction through the spring 186. At this time, the projections 173,
174 abut against the stop faces 189, 190 at lock plate 179 to thereby restrain
the levers 160, 161 from moving in the operating directions respectively.
Furthermore, the feed reel 2, take-up reel 3 and capstan 10, as
shown by the phantom line in Figure 1, are driven in such a manner that one
pulley 191 is coupled with the flywheel 11 through a belt 1937 the other pulley
192 is coupled with a pulley 195 at the rapid feed gear 16 through a belt 194,
and another pulley 196 at the gear 16 is coupled with a pulley 198 through
a belt 197.
Furthermore, the automatic stopping mechanism actuates the plunger
20 to turn on through electric elements ~not shown~ for detecting the finish
of unloading. The plunger 20, as shown in Figures 20 through 23, engages an
actuating arm 199 at its hook 200 with the foremost end of L-like shaped
retainer 162 at the video recording button ~REC) side thereof, so that the
plunger 20 is actuated to turn the retainer 162 against the spring 163 to
thereby disengage the retainer 162 from the projection 166 at the lever, 157,
158, 160 or 161 of any button in operation.
Furthermore, the capstan 10 and group of heads- 7, 8 and 9, are set
opposite to the pair of reels 2, 3 sandwiching the rotary head 6. Especially,
in this embodiment, the axis of capstan 10, the axis 201 of rotary head 6, and
the center between the pair of reels 2, 3, are aligned. The first loading
gear ring 12 and second loading gear ring 13 are aligned at the axes thereof
- 18 -
on the above straight line. I-lence, the pinch roller ~ and take-out pin 5 are
relatively loaded or unloaded to or from the caps~an 10 and heads 7, 8 and 9
in the vicinity of the rotary head 6, thereby drawing out the tape nearly at
random. Consequently, the mechanism necessary for loading is designed with
ease and the tape cassette of small size is adopted to make the whole mechanism
simple and compact.
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