JP2001250299A - Video deck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and to reduce the number of assembling steps by uniting a tape cassette constituting a tape deck with a mechanism part for loading/unloading a tape cassette and traveling a tape to form an integral mechanism unit. SOLUTION: This video deck is provided with a cassette guiding part having a freely opened/closed opening for inserting a tape cassette having a tape wound, an LS main body part for fixing the left and right hubs of the tape cassette guided by the cassette guiding part to a reel, and moving it to a position for driving control, and a tape driving control main body part for pulling out the tape of the tape cassette fixed to the LS main body part, loading the tape in a position where a video recording/reproducing drum is slidably in contact, and guiding it to a position for tape traveling. The tape driving control main body part is provided with a lever mechanism unit, where an opening/ closing mechanism part for locking the opening when the LS main body part is moved to the position for the driving control of the LS main body part, a reel braking mechanism part for braking a reel, and a tape traveling mechanism part for moving a pinch roller to a capstan shaft are integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video deck, and more particularly, to an improvement in a mechanism for driving / controlling tape loading / unloading and tape running.

[0002]

2. Description of the Related Art A video deck according to the prior art is shown in FIG.
As shown in FIG. 1 and FIG. 12, a tape drive control main unit 100 for controlling the tape to slide on the drum, and an LS for moving the tape up and down with respect to the tape drive control main unit 100 so as to control the rotation drive and insertion / removal of the tape. (Linear Skatin
g) It is composed of a main body section 140 and a cassette guide section (not shown) which is attached to the LS main body section 140 and guides insertion and removal of the cassette 170. In such a structure, when the tape cassette 170 is put in and out, the LS main unit 140 connected by closing the tape guide unit while inserting the tape cassette from above with the cassette guide unit opened is opened. The tape cassette is mounted on the tape drive control main unit 100 while automatically moving downward and performing a tape cassette loading operation.

As shown in FIG. 13, a tape drive control main body unit 100 has a recording / reproducing drum 101 arranged at a substantially central position in the depth direction of a substantially rectangular chassis, and a tape is slid on the drum 101. Coaster part 102
And first and second loading gears 103 and 104 for controlling loading / unloading of the tape, and an LS main body guide arm 1 provided on the first loading gear 103.
LS main body driving knob 106 for rotating the LS 05, a soft brake guide 107 for controlling a soft brake 149 of the LS main body 140 driven according to the rotation of the first loading gear 103, and a second loading gear 104.
And a hard brake guide 108 for controlling a hard brake 150 of the LS main body 140 driven in accordance with the rotation of. The first loading gear 103 is rotated by the rotation of the tape drive motor 110. The LS main body guide arm 105 is attached to the mounting projection 116b.
A rotating groove 117 that engages with the LS main body driving knob 106 that moves in conjunction with the rotation of the first loading gear 103 and moves up and down.
Guide groove 152 of LS cam plate 148 of LS main body 140
And an LS main body guide convex portion 118 that engages with the LS main body.

The driving of the soft brake guide 107 is controlled by the rotation of the second loading gear 104, and the hard brake guide 108 is driven by the first loading gear 1.
The pinch roller guide portion 109 that is driven and controlled by the rotation of the motor 03 and guides the connected pinch roller 147 is controlled. Further, the first loading gear 103 moves the connecting plate 112 connected to the tape guide portion 11 of the coaster portion 102 in the vertical direction by rotation, and moves the tape guide portion 111 toward the drum 101 to rotate the tape to the drum 101. Make sliding contact.

Further, at a position near the drum 101, a capstan support portion 113 for running the tape is provided.
Is composed of a capstan motor 114 and a capstan support shaft 115 which rotates in conjunction with the capstan motor 114. When the tape is running, the capstan support shaft 115 and the pinch roller 147 of the LS main body 140 are used. The tape is sandwiched between the pinch roll 147a and the tape drive roller 147a to drive the tape.

The tape drive control main body 100 is provided with four mounting protrusions 116a to 116d, and the LS main body 140 is connected to the mounting protrusions 116a to 116d.
It is structured to engage and attach to d so that it can slide up and down.

The LS main body 140 has walls 141 and 142 formed by cutting and raising left and right ends of a plate member formed in a substantially rectangular shape.
And an LS base 144 having a wall 143 cut and raised at a part of the back, a supply reel 145, a take-up reel 146, and a take-up reel 146 that are rotatably arranged on the left and right sides of the LS base 144.
Is moved between the pinch roller 147 and the guide roller (not shown) provided at a position near the supply side reel 145 and the wall 143 behind and at a position close to the wall, and the LS main body 140 is moved up and down. LS cam plate 148 serving as a support shaft for soft brake and soft brake 149 and hard brake 150 provided near the take-up side reel 146.
It is composed of The walls 141 and 1 are located at the left and right ends.
The first, second, and third grooves 151a, 151b, 151c formed of elongated grooves along 42 and the supply-side reel 1
A fourth groove 151d provided at a lower position of the groove 45 is formed, and the first to fourth grooves 151a to 151d are grooves to be mounted on the mounting protrusions 116a to 116d of the tape drive control main body 100. Further, an LS cam plate 148 is provided at a position near the supply-side reel 145 to engage with the LS main body guide projection 118 provided on the LS main body guide arm 105 of the tape drive control main body 100. .

To mount the LS main body 140 having such a structure on the tape drive control main body 100, the LS main body guide arm 105 is inserted into the guide groove 152 of the LS cam plate 148.
Of the tape drive control main body 100 into the first to fourth grooves 151a to 151d, and the pendulum gear 1
60 and the pendulum gear 161 are attached.

[0009] Of the operations in the tape deck having such a structure, especially the loading operation is shown in FIG.
This will be described with reference to FIGS.

First, in FIG. 14, when the LS main unit 140 is loaded from the unloaded state in which the LS main unit 140 is positioned upward with respect to the tape drive control main unit 100, the first
Loading gear 103 rotates rightward. Then, the LS main body driving knob 106 is rotated rightward to move the LS main body guide convex portion 118 downward, and the L
The S body 140 is moved downward. At the same time, the second loading gear 104 rotates counterclockwise, but since the groove of the second loading gear 104 is on the same circumference, the soft brake guide 108 does not move. Further, since the LS main body guide arm 105 moves downward, the two tape guide portions 111 connected by gears via the connection plate 112 are provided.
Slips on the coaster section 102 so that the drum 101
Move in the direction.

Next, in FIG. 15, when the first loading gear 103 further rotates clockwise, the LS main body drive knob 106 moves in a free state in the rotation groove 117, and the hard brake guide 108 Moves rightward and then leftward by the clockwise rotation of the first loading gear 103 to bring the reel 146 into a stopped state. At the same time, the pinch roller guide portion 109 is also moved by the hard brake guide portion 108 in the left direction and then in the right direction, so that the pinch roller 147 can be reliably guided, and the pinch roller 147a of the pinch roller 147 is sandwiched by a tape (not shown). Is the capstan spindle 11
Contact 5

Next, in FIG. 16, the first loading gear 103 further makes two clockwise rotations to move the hard brake guide 108 to the left and to rotate the pinch roller guide 109 to the right to pinch. Roller 147
Of the pinch roll 147a to the capstan support shaft 115 is stabilized. At the same time, when the second loading gear 104 rotates counterclockwise, the soft brake guide portion 108 guided by the groove on the same circumference is guided by the groove deviated from the groove on the same circumference. The upward movement of the soft brake 149
Rotate to the right to apply the soft brake. Thus, the loading operation is completed, and the tape (not shown) can be run with the soft brake applied.

[0013]

However, the mechanical structure of the video deck according to the prior art is, in particular, the vertical movement of the LS main body, the soft brake of the reel, and the contact mechanism of the pinch roller with the capstan. Have a separate structure, so that there is a problem that the number of assembling steps is large and the structure is complicated.

Therefore, there is a problem which must be solved to reduce the number of parts and the number of parts while increasing the functions of the conventional mechanical mechanism.

[0015]

In order to solve the above-mentioned problems, a video deck according to the present invention has the following configuration.

(1) A cassette guide section having an openable and closable opening into which a tape cassette wound with a tape can be inserted, and a tape cassette guided by the cassette guide section is mounted on a reel and moved to a position where drive control is performed. An LS main unit to be driven, and a tape drive control main unit that draws out a tape of a tape cassette mounted on the LS main unit, loads the tape into a position where it slides on a recording / reproducing drum, and guides the tape to a position where the tape can run. The tape drive control main body includes an opening / closing mechanism for locking the opening when the LS main body moves to a position controlled by the drive, a reel brake mechanism for applying a brake to a reel, and a capstan shaft. A video having a lever mechanism integrated with a tape running mechanism for moving a pinch roller. Tsu key. (2) The tape running mechanism is configured such that one end of the long plate member is used as a support shaft and the other end is urged by an urging member, and the pinch roller is moved to a substantially intermediate position with the capstan shaft. (1) The video deck according to (1), wherein a biasing end portion for pressing is provided.

As described above, the tape drive control main body is
An opening / closing mechanism for locking the opening when the S body moves to the position controlled by the drive, a reel brake mechanism for applying a brake to the reel, and a tape running mechanism for moving the pinch roller to the capstan shaft. Is provided, it is possible to assemble and assemble the lever mechanism in advance, thereby reducing the number of assembly steps and the number of parts.

[0018]

Next, an embodiment of a video deck according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the mechanical structure of the video deck according to the present invention includes a tape drive control main body 20 for controlling the tape wound on the tape cassette 10 to be in sliding contact with the drum. An LS (Linear Skating) main unit 50 that moves up and down with respect to the tape drive control main unit 20 to control the rotational drive and insertion / removal of the tape; And a unit 80. In such a structure, the tape cassette 10 can be moved in and out by opening the cassette guide section 80, inserting the cassette tape 10 around which the tape is wound from above, and closing the cassette guide section 80. The LS main unit 50 moves downward in the tape drive control main unit 20 side, and performs a loading operation of the tape cassette 10 to load a tape into the tape drive control main unit 20.

As shown in FIGS. 3 and 4, the tape drive control main body 20 cuts and raises one side of a chassis formed in a substantially square shape, and the cut and raised plate member 21 has two elongated LS main body guides. The structure is provided with grooves 22a and 22b. At the approximate center of this chassis, in the depth direction (Fig. 3
A right side of the drum 23 includes a drum mounting section 24 in which the drum 23 is disposed in an inclined state.
5, and a capstan motor 26 for running the tape is arranged at the left side of the drum 23.

The capstan motor 26 includes a capstan support shaft 2 rotatably supported by a capstan support 26a.
6b, the capstan support shaft 26 is provided.
Reference numeral b denotes a support shaft that rotates in accordance with the rotation speed of the capstan motor 26, and has a configuration in which the tape is run between pinch rolls.

The tape drive motor 25 rotationally drives four gears. The first gear 27 for transmitting the rotational drive from the motor 25 and the LS main body 50 are connected to the tape drive control main body 20 side. A second gear 28 for sliding up and down, a third gear 30 for driving a tape guide portion 29 so as to bring the tape into sliding contact with the circumferential surface of the drum 23, and a lock for the cassette guide portion 80. A fourth gear 32 for driving the release / supply side soft brake and a lever mechanism 31 for pressing the lock and pinch roller 57 against the capstan support shaft 26b.
It is composed of

The second gear 28 moves the LS main body guide arm 33 up and down, and
The rotation of the take-up side reel 56 of the LS main body 50 is controlled by interlocking the shift bar 34 with the vertical movement of.

As shown in FIG. 4, the LS main body guide arm 33 is formed of a plate member having a substantially S-shaped shape, provided with a through hole 35 at one end thereof, and a second hole at a substantially intermediate position. A first convex portion 36 fitted into the groove 28a of the gear 28,
The other end is provided with a first convex portion 36 and a second convex portion 37 projecting in the opposite direction. The second convex portion 37 is engaged with the LS cam plate 60 of the LS main body 50 to move the LS main body 50 up and down.

The shift bar 34 is mainly shown in FIGS.
As shown in FIG. 5, the LS main body guide arm 33 is rotatable to prevent the LS main body from coming off and to control the braking of the take-up side reel 56. A substantially triangular plate member is provided on a rectangular side surface. At the apex of this triangular shape, a convex portion 38 that fits into the groove 28a (see FIG. 4) of the second gear 28, and grooves 39a, 39b for vertically moving in a rectangular linear shape, 39c is provided.

The lever mechanism 31 is, as shown in FIG.
The lever base 40 includes a stepped lever base 40 and a pinch roller biasing section 42 that rotates by the biasing force of the spring 41. The lever base 40 is formed with a step at a substantially middle position in a substantially trapezoidal shape in FIG. , The pivot hole 40 at the bottom left end
a, a cassette eject end 43 cut and raised at the right end thereof, a soft brake end 44 cut and raised at an upper position opened to accommodate the spring 41, and a soft brake end 44. Hard brake end 45 cut and raised near the right direction
Is provided. Pinch roller urging section 42
Is connected to the lever base 40 by one end formed in an elongated shape.
, And the other end is attached to a spring 41 to always obtain a biasing force. And
It has a structure in which a pinch roller biasing end 46 cut and raised at a substantially central position is provided. As shown in FIG. 4, a structure in which a lever mechanism cover 48 is placed over the lever mechanism 31 and disposed. Has become. The lever mechanism cover 48 includes a guide plate 48a for guiding a brake mechanism 61 of an LS main body 50 (see FIG. 6) described later. In this, the cassette eject end 43 is L
An opening / closing mechanism that locks the open / close portion of the cassette guide unit 80 in a closed state with respect to the S body unit 50 to a closed state, and releases the locked state to open the state when unloaded.

As shown in FIGS. 3 and 6A, the LS main body 50 and the pinch roller biasing end 46 of the lever mechanism 31 (see FIG. 3) constitute a tape running mechanism. An LS base 54 having walls 51 and 52 formed by cutting left and right ends of a substantially square plate member and a wall 53 formed by cutting a part of the rear thereof, and a left and right side of the LS base 54 can be rotated. Supply and take-up side reels 55 and 56, a pinch roller 57 and a guide roller 58 provided near the take-up side reel 56, and a guide roller also serving as a brake provided near the supply side reel 55 The LS cam plate 6 serving as a support shaft for vertically moving the LS main body 50 provided between the supply-side reel 55 and the rear wall 53 and close to the wall. 3, a brake mechanism 61 for forming a soft brake and a hard brake of the take-up side reel 56, a supply side brake mechanism 62 for applying a brake to the supply side reel 55, and both reels 55, 56 shown in FIG. An opening 63a of a size to be seen;
And a lid 75 having a cover 63b. Further, between the LS main body 50 and the tape drive control main body 20, the rotation speed from the caps motor 26 is applied to the reel (55).
Or 56) is mounted. The reels 55 and 56 are assembled such that two soft reels 55a and 56a and hard reels 55b and 56b are always rotated with a predetermined frictional force with a magnet interposed therebetween.
When the hard reels 55b and 56b are locked, the reel 5 is driven to rotate with frictional force.
The rotation of 5, 56 stops.

As shown in FIG. 6 (B), the pinch roller 57 comprises a pinch roll 57a formed in a cylindrical shape and rotatably attached thereto, and a supporting body 57b for rotatably supporting the pinch roll 57a. Have been. The support body 57b has a pinch roll 57a attached to one end and a rotatable support shaft 57c provided at the other end. The support body 57b is bent downward at a position near the support shaft 57c to form a pinch roll at the end. An urging pressing portion 57d for urging the capstan shaft 57a against the capstan support shaft 26b (see FIG. 3).
Is provided.

As shown in FIG. 6, the brake mechanism 61 includes a soft brake 63, a hard brake 64, and a rotary gear 65 centered on a pin provided near the take-up reel 56. I have.

The soft brake 63 is made of a metal member, and is bent to form circular openings of different sizes so as to face each other, and a soft stopper 66 which is a claw to be engaged with the soft reel 56a. The structure has a soft guide end 67 for rotating the soft stopper 66 in a direction to be inserted between the teeth of the soft reel 56a.

The hard brake 64 has an insertion hole 68 for inserting a pin at a substantially central position, a hard stopper 69 which is a claw engaging with the hard reel 56b at one end, and a hard stopper 69 at the other end. The LS main body 50 includes a hard brake guide 70 that is interlocked with the vertical movement of the LS main body 50, and a stopper guide 71 that is formed to protrude substantially in the circumferential direction.

The tape drive control main body 2 having such a structure
0, the LS main body 50, and the cassette guide 80, as shown in FIG.
0 LS main body guide grooves 22a, 22b and LS main body 50
The two convex portions 77a and 77b provided on the outside of the tape drive control body 20
The grooves 78a and 78b of the LS main body 50 are engaged with a and 48b, and a fixing bar 79 is attached from above and screwed and attached. Then, the S-shaped groove 81 of the cassette guide portion 80 is engaged with the convex portion 75a of the LS main portion 50 in the LS main portion 50 attached to the tape drive control main portion 20, and the hinge portion 82 is connected to the LS main portion. The assembly is completed by engaging with 50 semicircular hinge receiving portions 75b.

Next, the operation of the lever mechanism 31 of the tape drive control main body 20 and the brake mechanism 61 of the LS main body 50 having the above-described configuration will be described with reference to unload end (ULE) and load / unload (L / L). The operation at the time of UL), stop (STOP), and reel running (RP) will be described with reference to the drawings.

At the time of the unload end (ULE), as shown in FIG. 7, the LS main body 50 is in the upward state, that is, the tape guide 10 is accommodated in FIG. In the closed state, the hard brake guide 70 of the hard brake 64 of the brake mechanism 61 shown in FIG. 7 is engaged with the guide plate 48a of the lever mechanism cover 48 (see FIG. 4). Is done. Soft stopper 66 and hard stopper 69
Is located away from the reel 56, and the reel 56 is in a free state. That is, when the tape cassette is engaged with the reel 56, the tape cassette can be easily attached and detached by keeping the reel 56 free.

Next, when loaded from the unload end (ULE) state, as shown in FIG. 8, when the LS main body 50 starts to slide in the downward direction toward the tape drive control main body 20, the lever is released. The brake mechanism 61 starts sliding on the upper part of the mechanism 31. The slide is performed in a state where the hard brake guide 70 of the brake mechanism 61 is in contact with the guide plate 48a, and the tape (not shown) is loaded so as to slide on the drum. And
When the hard brake guide section 70 reaches the bent end of the guide plate section 48a, the contact state is released from the contact state,
Hard brake 64 is rightward (clockwise) in FIG.
To the hard stopper 69 and the hard brake 56
The reel 56 in the free state enters the gear b in the stop state. At this time, the soft brake 63 has the soft guide end 67 in contact with the soft brake end 44, so that the soft stopper 66 is prevented from entering the gear of the soft reel 56a.

Next, in order to change from the load state to the stop state, as shown in FIG. 9, the hard brake guide 70 of the brake mechanism 61 rotates through the bent portion of the guide plate 48a. Then, the hard stopper 69 enters between the gears of the hard reel 56b and stops, and the lever mechanism 31 rotates upward, so that the soft guide end 67 moves in the direction to come off the soft brake end 44. The hard brake end 45 moves to a position where the stopper guide 71 can be pressed.

Next, in order to make the tape run from the stop state, the soft brake end 44 is urged by further rotating the lever mechanism 31 as shown in FIG. When the soft guide end 67 comes off, the soft stopper 66
It enters the direction a and engages between the gears of the soft reel 56a. At the same time, when the hard brake end 45 pushes the stopper guide 71 and the hard stopper 69 is disengaged from the hard reel 56b, the soft reel 56
a) The soft brake is applied. Furthermore,
The pinch roller urging end 46 is synchronized with the pinch roller 57
By pressing the urging pressing portion 57d of the
By pressing the pinch roll 57a against the capstan support shaft 26b in a state where the urging force is applied, the tape is sandwiched between the pinch roll 57a and the capstan support shaft 26b so as to rotate in the rotation direction of the capstan support shaft 26b. Tape can be sent out.

[0038]

As described above, in the video deck according to the present invention, the opening of the LS main body, the soft brake of the reel, and the pressure driving of the pinch roller are collectively performed as one component. There is an effect that a mechanical mechanism corresponding to miniaturization can be realized by reducing the number of assembly steps and the number of assembly parts.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an overall configuration diagram in which a video cassette according to the present invention is opened and a tape cassette is inserted.

FIG. 2 is a perspective view schematically showing the entire configuration of the video deck in a closed state.

FIG. 3 is an exploded perspective view showing an exploded mechanical structure of the video deck.

FIG. 4 is an exploded perspective view showing an arrangement relationship of each component in the tape drive control main body.

FIG. 5 is an exploded perspective view of the lever mechanism.

FIG. 6 is an exploded perspective view of the LS main body.

FIG. 7 is an explanatory diagram showing an unload end state of the operation of the lever mechanism and the brake mechanism.

FIG. 8 is an explanatory diagram showing a load / unload state among operations of the lever mechanism and the brake mechanism.

FIG. 9 is an explanatory diagram showing a stop state of the operations of the lever mechanism and the brake mechanism.

FIG. 10 is an explanatory diagram showing a reel running state among the operations of the lever mechanism and the brake mechanism.

FIG. 11 is an exploded perspective view of a main part showing a state in which a tape cassette can be inserted with a mechanical deck in an open state in a conventional technique.

FIG. 12 is an exploded perspective view of a main part showing a state in which a tape can be loaded with a mechanical deck closed in a conventional technique.

FIG. 13 is an exploded perspective view of a tape drive control main body and an LS main body constituting a mechanical deck according to the related art.

FIG. 14 shows a conventional tape drive control main unit and L
It is explanatory drawing which showed the movement at the time of loading with S main part.

FIG. 15 shows a conventional tape drive control main unit and L
It is explanatory drawing which showed the movement at the time of loading with S main part.

FIG. 16 shows a conventional tape drive control main unit and L
FIG. 9 is an explanatory diagram showing a movement in a loading completed state with the S body.

[Explanation of symbols]

10: tape cassette, 20: tape drive control main body,
21; plate member, 22a; LS body guide groove, 22b; L
S body guide groove, 23; drum, 24; drum mounting part,
25; tape drive motor, 26; capstan motor, 26a; capstan support, 26b; capstan support shaft, 27; first gear, 28;
a; groove, 30; third gear, 31; lever mechanism, 3
2; fourth gear, 33; LS main body guide arm, 34;
Shift bar, 35; through hole, 36; first convex portion, 37; second convex portion, 39a to 39c; groove, 40; lever base, 4
0a; rotating hole, 41; spring, 42; pinch roller urging portion, 43; cassette eject end, 44; soft brake end, 45; hard brake end, 46; pinch roller urging end, 48; Lever mechanism cover, 48
a; guide plate portion, 50; LS main body portion, 51; wall, 52;
Wall, 53; wall, 54; LS base, 55; supply side reel, 56; take-up side reel, 56a; soft reel, 56b; hard reel, 57; pinch roller,
57a; pinch roll, 57b; support body, 57c; support shaft, 57d; biasing and pressing portion, 58; guide roller, 59;
Guide roller, 60; LS cam plate, 61; brake mechanism, 63; soft brake, 63a; opening, 63b;
Opening, 64; hard brake, 65; rotating gear, 6
6; soft stopper, 67; soft guide end, 6
8; insertion hole, 69; hard stopper, 70; hard brake guide portion, 71; stopper guide portion, 77; convex portion, 78a; groove, 78b; groove, 79;
Cassette guide portion, 81; groove, 82; hinge portion

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Fujii 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D081 AA07 DD02 EE04 EE09 EE14

Claims (2)

[Claims] A cassette guide having an openable and closable opening into which a tape cassette wound with a tape can be inserted;
LS for mounting the tape cassette guided by the cassette guide section on a reel and moving the tape cassette to a position for drive control
A tape drive control main body for pulling out a tape of a tape cassette mounted on the LS main body, loading the tape in a position where the tape is in sliding contact with a recording / reproducing drum, and guiding the tape to a position where the tape can travel; A drive control main body, which is configured to lock the opening when the LS main body is moved to a position controlled by the LS main body;
A video deck comprising a lever mechanism unit integrally comprising a reel brake mechanism unit for applying a brake to a reel and a tape traveling mechanism unit for moving a pinch roller to a capstan shaft. 2. The tape running mechanism section includes a long plate member having one end portion as a support shaft and the other end portion being urged by an urging member, and capping the pinch roller at a substantially intermediate position. 2. The video deck according to claim 1, wherein a biasing end for pressing the stun shaft is provided.