JPS60242544A - magnetic tape device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves pulling out a magnetic tape from a cassette containing a pair of reel hubs for winding the magnetic tape to the outside of the cassette, and running the magnetic tape along a magnetic head such as a rotating magnetic head installed outside the cassette. The present invention relates to a magnetic tape device for recording and reproducing signals, storing and reproducing (hereinafter referred to as recording/reproducing).

Generally, in a magnetic tape device such as a cassette-type video tape recorder, a magnetic tape is pulled out from a cassette and then transported to a rotating magnetic node or attached to a fixed magnetic head for audio.
However, if the tape drive motor is used to pull out the magnetic tape, a plunger or complicated latch mechanism is required to switch and transmit the motor drive force to the magnetic tape drawer and tape drive. Therefore, many devices are equipped with a motor dedicated to drawing out the magnetic tape. Therefore, switching the operating mode of the device is performed using a drive system that is completely independent of the tape drawing operation, such as a solenoid, which is complex in structure, heavy in weight, and high in cost.

The present invention solves the problems of such conventional magnetic tape devices, and provides a magnetic tape device that has a simple structure and can drive the magnetic tape drawing operation and the operation of switching the operation mode with a single motor. It is something.

Hereinafter, the present invention will be explained based on illustrated embodiments.

In each figure, the shaft 12.1 is embedded on the upper surface of the substrate 10.
When the cassette 20 is installed at a predetermined location on the main body of the apparatus, the supply reel stand 16 and the take-up reel stand 18, which are each rotatably supported by the cassette 20, are rotated. They are engaged with the take-up reel hub 24 so that they can rotate together. The magnetic tape 26 wound on the supply reel knob 22 is guided so as to cover the front surfaces of a pair of notches 28 and 30 provided at the front of the cassette 2o, and is then guided to the take-up reel knob 22. 24. Guide posts 34, 36 and 38, 40 are disposed within the pair of notches 28, 30 for pulling out and guiding two magnetic tapes 32, respectively.

On the other hand, a motor 5 is mounted on the shaft 42 installed on the back side of the board 10.
A gear 48 rotated from 0 through a belt 44 and a pulley 46 is supported, and near the gear 48 a cam 52 meshed with the gear portion 48 formed on the outer periphery is supported by a shaft 58 implanted on the back surface of the base plate 10. It is rotatably supported. As clearly shown in FIGS. 7A and 7H, the cam 62 is a positive cam with two grooves 54 and 66 extending over 3,600 times on both sides, and its lift curve is shown by curves a and b in FIG.
As shown, the lift amount changes over a range of rotation angles. Note that a in FIG. 8 indicates a lift curve of the groove portion 54, and b indicates a lift curve of the H groove portion 56.

In one groove portion 54 of the cam 52, a first cam face (A lower), which will be described later, is interlaced with the first cam face A lower, which will be described later.
It looks like the cam follower is moving. A shaft 60 is disposed on the back side of the substrate 10, and a sector gear 64 having a first cam follower 62 that intertwines with one of the grooves 54 of the cam 52 is rotatably supported on this shaft. 64
66 teeth, said guide post) 34.36°38.4
0 from the inoperative position shown in FIG. 1 to the operative position shown in FIG. 3 and vice versa. . That is, when the cam 52 starts rotating counterclockwise from the position shown in FIG.
0 in the counterclockwise direction as shown in FIG. direction and pull out the magnetic tape 32 to the outside of the cassette 20. Then, when the rotation angle of the cam 620 reaches 3600, the rotation of the sector gear 64 stops at the position shown in FIG. Then, the magnetic tape 68. is a drum with a rotating head (not shown) inside as shown in Figure 2.
and a fixed head 2 for recording/reproducing audio signals.

On the other hand, the rotation angle of the cam 52 is from 00 to -26°'! .

During this period, the lift amount of the groove portion 54 does not change as is clear from the curve a in FIG.
It is stopped at the position shown in the figure.

A capstan 74 rotatably disposed on the substrate 10.
is rotated via a capstan belt 76 by a capstan motor 78 that can be rotated in forward and reverse directions.

The main rod 82 having the second cam follower 8o that fits into the other groove 66 of the cam 52 is connected to the guide shaft 84.
86 and a guide groove 88 formed in the main rod 82,
It is guided by 90 and can freely reciprocate in a straight line.

The other groove portion 56 of the cam 52 also extends over 3600 mm, and is a positive cam. As shown by b in FIG. 8, the lift curve is such that the second cam follower 80 moves only in the section where the lift amount changes. That is,
When the cam 52 begins to rotate counterclockwise from the position shown in FIG. 2, the first 200 i
d Main Rondo 82 does not move at all, but the rotation angle is 200
2, the main rod 82 begins to move to the left in FIG.
The motor 6o is moved to the position shown in the figure, a recording/reproducing operation completion switch (not shown) is turned on, and power is supplied to the motor 6o.

A pinch roller lever 94 is rotatably supported on a shaft 92 installed on the upper surface of the substrate 10.

A shaft 9e implanted at one end of the pinch roller lever 94
A Kid pinch roller ~98 is rotatably supported. The other end of the pinch roller lever 94 and the main rod 82
A tension spring 100 is pushed between the two, and the locking portion 102 provided on the pinch roller lever 94 and the tip of the adjustment screw 104 held in the main door 82 are in contact. Therefore, when the cam 52 starts rotating counterclockwise in FIG.
Since the main rod does not move at all, the pinch roller lever 94 and the pinch roller 98 are also stopped at the position shown in FIG. When the rotation angle reaches 200, the main rod 8
2 moves to the left in FIG. 2, or to the right in FIG. 1, and the pinch roller lever 94 begins to rotate counterclockwise in FIG. On the way that the main rod 82 reaches the position shown in FIG. When the tip and the locking part 102 of the pinch roller lever 94 are separated, the tension spring 100 is stretched and the main rod 82 is moved to the position shown in FIG. This is done so that you can obtain the crimp force.

In FIG. 3, the magnetic tape 68 that has been pulled out is transferred to the right in FIG. 3 by the cooperation of the carburetor's tongue 4 and the pinch roller 98, and is transferred onto the ℃ take-up reel hub 24 by well-known means. Allow it to be rolled up.

Reference numeral 114 denotes an idler lever rotatably supported on a shaft 106 implanted on the back surface of the board 10.

This has a bingo 10 that engages and disengages with the protrusion 108 of the main rod 82, and is urged to rotate counterclockwise in FIG. 2 by a tension spring 112. Further, one end of a support plate 124 is rotatably supported on a shaft 116 installed at one end of the idler lever 114, and a capstan belt 7 is mounted near the other end of the support plate 124.
6 and a quick-winding pulley 118 and 2 which are rotationally driven by a capstan motor 78 via a fast-winding belt 116.
A fast winding idler 120 that selectively intervenes and contacts one of the two reel stands 16 and 18 is attached to the spindle 122.
It is rotatably supported at . The rotation angle of the cam 62 is 0
At the position of 0 to 425 degrees, as shown in FIGS. 2 and 4, the idler lever 114 can be rotated counterclockwise in FIG. 110 is locked to the projection 10B of the main rod 82, it is restricted to the position shown in FIG.
A guide (not shown) is provided so that the supply reel table 16 and the take-up reel table 18 are spaced apart from the winding pulley 118 and the supply reel table 16 and the take-up reel table 18 at substantially equal distances. cam 62
When the main rod 82 rotates clockwise from the position shown in FIG. 2, the main rod 82 begins to move to the right in FIG.

When the cam 52 rotates to a rotation angle of −25°, the main rod 82 moves to the position shown in FIG.
As the protrusion 108 of No. 2 moves, the idler lever 11
4 is rotated counterclockwise in FIG. 2 by the urging force of the tension spring 112, and the idler 120 moves downward in FIG. 1 and comes into contact with the quick-winding pulley 118. At this time, the fast winding idler 120 is biased to the left or right in FIG. The fast-winding pulley is selectively brought into contact with the fast-winding pulley +7-118, and the rotational force of the fast-winding pulley is transmitted to the reel stand.

As described above, the clutch mechanism does not transmit the driving force of the interfering motor 6o when the cam rotation angle is o0 to 26 degrees to the magnetic tape pulling means, but only to the main rod 82 that switches the operation of the device. , so that operation switching can be performed with a simple structure.

Next, the operation will be explained.

When the record/playback switch (not shown) is pressed from the stopped state shown in Fig. 1, the capstan motor 7
8 rotates counterclockwise, and the cab's tongue 4 rotates clockwise in FIG. Now, the motor 50 starts rotating clockwise in Figure 2. The rotation of this motor 50 is transmitted to the cam 52 via the belt 44 and gear 48.
As is clear from the curve a in FIG. 8, even when the motor 6o starts rotating, the sector gear 64 does not start moving immediately.

When the rotation angle of the cam 62 exceeds 600, the first cam follower 62 fitted into one groove 54 of the cam 52
moves to the left in FIG.
3 in the counterclockwise direction as shown in FIG.
4.36 and 3B, 40d move in the direction of the arrow in FIG. 1 and pull out the magnetic tape 32 to the outside of the cassette 2o. When the rotation angle of the cam 62 reaches 3600, the guide post 34
．． 36 and 38.40 are moved to the position shown in FIG. As is clear from the curve a in FIG. 8, when the rotation angle of the cam 520 is 3600 degrees or more, the sector gear does not move, and the τ guide posts 34, 36 and 38, 40i are held at the positions shown in FIG. 3.

On the other hand, when the record/playback switch is pressed from the stopped state shown in FIG. 1, the motor 6o begins to rotate counterclockwise in FIG. 2 as described above. Although this rotation is transmitted to the cam 62, the main rod 82 does not start moving immediately, as is clear from the curved line in FIG. Therefore, pinch roller 98 remains in the position shown in FIG. and,
When the rotation angle of the cam 62 exceeds 200 degrees, the second cam follower 8o, which is in contact with the other groove 56 of the cam 52 (4-+), moves to the left in FIG. 84 and 86 to the left in FIG. 2. As a result, the pinch roller lever 94 begins to rotate counterclockwise in FIG. 1, and the pinch roller 98 comes into contact with the capstan 74. , when the steering wheel 52 rotates and the rotation angle reaches 426°, the main rod 82
moves to the position shown in FIG. 4, a recording/reproducing operation completion switch (not shown) is turned on, and power supply to the motor 50 is stopped. The pinch roller 98 is pressed against the capstan 74 by the elastic force of the tension spring 100 as shown in FIG.
is transferred at a constant speed to the right in FIG. 3, and the take-up reel hub 24 winds it up by known means.

In this manner, the magnetic tape 68 runs along the drum 7o and the fixed head 72, and signals are recorded/reproduced.

When a stop switch (not shown) is pressed, the power supply to the capstan motor 78 is cut off and the carburetor stan 4 is stopped. At the same time, the motor 60 is energized, the motor 60 rotates counterclockwise in FIG. Return to the position shown in the figure. At this time, the magnetic tape 68 that has been pulled out is cassetted by well-known means.
It is designed to be stored inside the throat 2o. Then, when the stop position detection switch (not shown) is turned on, the motor 50
rotation stops and returns to the stopped state.

During the above operation, since the bin 110 implanted in the quick-winding idler 120id and the idler lever 114 is locked by the protrusion 108 of the main rod 82, the supply reel stand 16, take-up reel stand 18 and It is spaced apart from the winding pulley 118.

Next, when a fast forward switch (not shown) is pressed, the capstan motor 78 rotates counterclockwise in FIG. 2, and the fast winding boot IJ-118 [clockwise in FIG. 1] rotates. The motor 5o rotates counterclockwise in FIG. 2, the cam 52 rotates clockwise in FIG. 2, and the main rod 82 moves rightward in FIG.

The idler lever 114 rotates counterclockwise in FIG. When the cam 62 rotates to a rotation angle of -25°, the main rod 82 moves to the position shown in Fig. 6, the quick winding operation completion switch (not shown) is turned on, and the power supply to the motor 6o is cut off. It will be done. Early winding idler 12011j: comes into contact with the early spring pulley 118, but in this case, the early winding idler 1
．． 1-118ij Since it is rotating clockwise in FIG. 1, the fast-winding idler 120 [is biased toward the right in FIG. It comes into contact with the IJ-118 and the take-up reel stand 18. Since the take-up reel stand 18 is rotated clockwise in FIG. 5, the magnetic tape 2e wound around the supply reel hub 22 is wound onto the take-up reel hub to perform a fast forwarding operation. In this case, the pinch roller 98 rotates in the position shown in FIG. When a stop switch (not shown) is pressed, the power to the capstan motor 78 is cut off, and the rotation of the capstan 74 is stopped, so that the fast winding pulley 1
18 also stops rotating. At the same time, the motor 50 is energized and rotates clockwise as shown in FIG. 6, performing an operation opposite to that described above, and moving along the fast winding idler 120ij guide (not shown) to the neutral position shown in FIG. The main rod 82 and the pinch roller 98 also return to the positions shown in FIG.

When the stop position detection switch (not shown) is turned on,
The power supply to the motor 60 is cut off, and the motor 60 returns to the stopped state.

During the above operation, the guide posts 34, 36 and 38,
40iTj is stopped at the position shown in FIG. 1, and the main rod 82 is reciprocated between the stop position and the fast-winding position without driving the magnetic tape pull-out means.

When a rewind switch (not shown) is pressed, capstan motor 78 rotates counterclockwise in FIG. 1, and fast winding pulley 118 also rotates counterclockwise.

The motor 50 [rotates counterclockwise in FIG. 2, the main rod 82 moves to the position shown in FIG. 6 in the same manner as during fast forwarding, and the fast winding idler 120 moves as shown by the dotted line in FIG. It contacts the fast winding boot IJ-118 and the supply reel stand 1e, rotates the supply reel stand 16 counterclockwise in FIG. 5, winds the magnetic tape 26 onto the supply reel hub 22,
When the stop switch (not shown) is pressed during the rewinding operation, the fast winding idler 118, main rod 82 and pinch roller 98 are moved in the same way as when the stop switch (not shown) is pressed after the fast forwarding operation described above. It returns to the position shown in FIG. 1 and enters a stopped state.

As described above, if the cam is configured to be driven in the direction of the recording/playback position with a positive rotation angle across the stop position, and in the direction of the fast winding position with a negative rotation angle,
The transition from the recording/reproducing mode to the fast-winding mode is very smooth.

As is clear from the above description, the present invention provides a connection between the first position where the magnetic tape in the cassette is pulled out and the second position where the magnetic tape is pulled out of the cassette and attached to the drum and fixed head. a magnetic tape pull-out means that reciprocates, a first cam that drives the magnetic tape pull-out means, an operation switching means that switches the operation mode of the apparatus, a second cam that drives the operation switching means, and the first cam that drives the magnetic tape pull-out means. cam and a motor for driving the second cam, and the magnetic tape drawing means and the operation switching means are driven by one motor, so the structure is extremely simple and light in weight. It is possible to realize an inexpensive magnetic tape device with a small number of parts.

Furthermore, in this embodiment, since the first cam and the second cam are formed on one rotating member driven by a motor, it is possible to obtain a compact magnetic tape device with fewer parts. can get.

In addition, in this embodiment, an actuating plate is provided that follows the second cam and moves to multiple positions such as the recording/reproducing position, the stop position, and the fast-winding position, and is configured to switch to the corresponding operation mode. Therefore, the operation mode can be switched reliably with a simple structure.

In addition, in this embodiment, the lift curve of the second cam is configured to have at least two flat parts, and each of the flat parts corresponds to the position of the operating mode of the device. In addition to being able to reliably switch the mode,
Since accurate positioning is achieved, there is also the effect that the operating mode can be maintained accurately.

Furthermore, in this embodiment, by using positive cams as the first cam and the second cam, accurate strokes of the fan teeth and the main rod can be obtained, making it even more effective.

In this embodiment, both the first cam and the second cam are positive cams, but the above-mentioned effects can also be obtained by using at least one of them as a positive cam.

3 and 4 are a top view and a back view of the main part in the recording/reproduction mode of the same embodiment, and FIGS. 5 and 6 are the main part back view of the same embodiment. Fig. 7A is a top view and a back view of the main part in the early spring mode of Embodiment 1, a top view and a back view of the cam in the same embodiment, and Fig. 8 is a lift curve diagram of the cam.

16... Supply reel stand, 18... Take-up reel stand, 32.69... Magnetic tape, 34.36
,38゜40 ・Guide post, 50... Motor, 5
2...Cam, 54.66...Groove, 62...
・First cam follower-64...Sector gear, 65
····gear.

7o...Drum, 72...Fixed head, 74...
... Capstan, 78 ... Capstan motor, 80 ... Second cam follower, 82 ...
・・Main rod, 98・・Pinch roller-111
8... Fast winding pulley, 120... Fast winding idler.

Claims (5)

[Claims] (1) A magnetic tape in which the magnetic tape is pulled out of the cassette from a cassette with a built-in pair of reel hubs for winding the magnetic tape, and is run along a magnetic head installed outside the cassette to record or play back signals. The apparatus includes a magnetic tape pull-out means that reciprocates between a first position where the magnetic tape in the cassette is pulled out and a second position where the magnetic tape is pulled out of the cassette and attached to the magnetic head. , a first cam that drives the magnetic tape pull-out means, an operation switching means that switches the operation mode of the apparatus, a second cam that drives the operation switching means, and the first cam and the second cam. 1. A magnetic tape device comprising: a motor for driving said magnetic tape drawing means and said operation switching means, said magnetic tape drive means being driven by one motor. (2) The magnetic tape according to claim 1, which has a rotating member driven by a motor, and the first cam and the second cam are formed on one rotating member. Device. (3) The operation switching means has an operation plate that moves to a plurality of positions following the second cam, and when the operation plate moves to the plurality of positions, the device is switched to a corresponding operation mode. A magnetic tape device according to claim 1, characterized in that: (4) The lift curve of the second cam has at least two flat portions, and the flat portions correspond to the operational position of the device. magnetic tape device. (5) Claim 1 characterized in that at least one of the first cam and the second cam is a positive cam.
Magnetic tape device described in Section 1.