JPS6158898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic tape device that records or reproduces video signals on the magnetic tape, or records and reproduces video signals, by winding a magnetic tape around a tape guide drum incorporating a rotating magnetic head. It is related to.

Conventionally, in this type of magnetic tape device, for example, a cassette video tape recorder (hereinafter referred to as a VTR), after a tape cassette containing a magnetic tape is loaded into the device, a portion of the magnetic tape is looped from the tape cassette. Pull it out and wrap it around the tape guide ram. In order to perform so-called tape loading or unloading operations, a dedicated tape loading motor was installed as a drive source for the operations.

The present invention eliminates the dedicated tape loading motor and uses a constant-speed magnetic tape running drive motor (capstan motor) to perform tape loading or unloading, thereby reducing the number of parts in the strap. The present invention provides a magnetic tape device that can reduce costs, reduce costs, and make effective use of space by omitting a tape loading motor.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on illustrated embodiments. Figure 1 shows a small VTR that is an embodiment of the present invention.
FIG. 3 is a plan view of main parts in a stopped state. In the figure, reference numeral 10 denotes a substrate, and a tape guide drum 14 containing two rotating magnetic heads 12 is attached to the upper surface of the substrate. Reference numerals 16A and 16B are tape pull-out members, which are ring-shaped movable bodies 18A and 16B, which are overlapped with each other along the periphery of the tape guide drum 14 and made rotatable in opposite directions by appropriate well-known guiding means. It is rotatably attached to a part of 18B with pins 17A and 17B. Drive gears 20A, 20B are engaged with toothed portions formed on the outer periphery of each of the movable bodies 18A, 18B, and the tape pull-out member 16A, 16B is moved from a first position shown by a solid line to a second position shown by a chain line. A tape cassette 21 has openings (or notches) 22A and 22B at the front end for drawing out the tape, and a supply reel (or hub) 26 and a take-up reel 2 on which the magnetic tape 24 can be wound.
It stores 8.

Insert the tape cassette 21 into the predetermined location of this device.
When the tape drawer member 16A,
Two sets of tape guides 52 planted on 16B
A, 52B, 52C, 52D are tape cassettes 2
1 into the openings 22A, 22B of the tape drawer members 16A, 16B from the first position to the second
By moving to this position, the magnetic tape 24 in the tape cassette 21 is pulled out in a substantially M-shaped loop to a position where it can be wound around the outer periphery of the tape guide drum 14. That is, tape loading is performed.

Reference numeral 30 denotes a drive motor that rotates in a predetermined direction at a predetermined speed by a well-known appropriate speed control circuit and drive circuit, and its power is supplied to the motor pulley 3.
2, is configured to be transmitted to a capstan 38 via a belt 34 and a flywheel 36. Note that when the tape cassette 21 is installed in a predetermined location of the apparatus, the capstan 38 enters into an opening (or notch) 22C formed in the side surface of the tape cassette 21 and inserts the magnetic tape 24 into the opening (or notch) 22C. It is located at the back.

40 is the opening 22C of the tape cassette 21.
The pinch roller is rotatably attached to the tip of a pinch roller arm 42 so as to face the pinch roller arm 42, and the pinch roller arm 42 is rotatably attached to a recording/reproducing rod 54, which will be described later, with a pin 41.

44 is a part of the pinch roller arm 42;
This is a coiled spring installed between a pin 43 fixed on the substrate 10, and when the recording/reproducing rod 54 is pushed in and the pin 41 moves away from the pin 43, the pin 41 is pinched. Rotate the roller arm 42 clockwise from the position shown in FIG.
The pinch roller 40 is inserted into the opening 22C of the tape cassette 21, and serves to press the magnetic tape 24 located in the opening 22C against the capstan 38 with a predetermined pressing force.

46 and 48 respectively indicate tape cassette 2.
These are an erasing head and a magnetic head for recording and reproducing audio signals, which are disposed on the running path of the magnetic tape 24 pulled out from the magnetic tape 1.

50A and 50B are the tape drawer members 16
In order to stop the movement of the tape guides 52A and 16B at the second position, the positioning member has a V-shaped receiving surface that can receive the tape guides 52A and 52B at the end of movement of the tape guides 52A and 52B, and these substrates 10 Fixed on top.

Reference numeral 53 denotes a recording/reproducing operation button for recording or reproducing data on the magnetic tape 24. A recording/reproducing rod 54 is connected to the recording/reproducing operation button 53 and is slidably disposed on the substrate 10 in the longitudinal direction. A locking pin 60A is provided. The lock plate 56 is slidable in the direction of arrow A and the opposite direction using guide pins 62A and 62B provided on the base plate 10 as guides, and is biased to move in the direction of arrow A by a tension spring 64. ing. 66 is a stop button, and 68 is a stop rod, which is provided with a lock pin 60B that fits into the lock release hole 59 of the lock plate 56.

FIG. 2 is an enlarged plan view of the essential parts of the substrate 10 in the vicinity of the capstan 38 in FIG. Hereinafter, the related operations between the capstan 38 and the moving body 18A will be described with reference to FIG. 2.

A first gear 70 is fixed to a capstan 38 that rotates integrally with the flywheel 36. The drive gear 20A meshing with the moving body 18A is rotatably provided on the substrate 10 and is configured to rotate integrally with a second gear 74 provided at the bottom of the substrate 10 via a shaft 72. ing. 76 is a clutch arm, which is attached to the shaft 72
A first idler gear 77 is rotatably provided at one end and configured to mesh with the second gear 74. Furthermore, although the clutch arm 76 is biased to rotate in the direction of arrow B by a suitable spring (not shown), the first pawl 78 of the clutch arm 76 is pressed against the recording/reproducing rod 54. Rotation in the direction of arrow B is restricted by abutting against a stop pin 80 provided at .

82 is a clutch release arm, which is connected to the shaft 8.
4, and is rotatable around the tension spring 8.
6, it is always urged to rotate in the direction of arrow C. A regulating pin 88 is provided at one end of the clutch release arm 82, and this regulating pin 88 engages with a regulating hole 90 of the recording/reproducing rod 54. Furthermore, a release pin 92 is provided in a part of the clutch release arm 82, and when the clutch release arm 82 rotates in the direction of arrow C, it comes into contact with the second pawl 94 of the clutch arm 76 and releases the clutch arm 76. It is provided so that it can be rotated in the direction opposite to arrow B. Furthermore, a roller 96 is provided at one end of the clutch release arm 82, and the roller 96 engages with a convex portion 100 of an end cam of a tape-ending end position detecting member 98. The tape loading end position detecting member 98 is rotatable about a shaft 102, and a concave portion 104 at one end of the tape loading end position detecting member 98 is connected to the moving body 18A.
When the movable body A moves in the tape loading direction, that is, the direction of arrow F, it engages with a pin 106 provided on the movable body 18A, and detects the moving position of the movable body 18A. be. The details will be described later.

Next, referring to FIG. 3, the operation when performing recording/reproducing operations will be explained. When the recording/reproducing operation button 53 is pushed in the direction of arrow D with the tape cassette 21 attached to a predetermined location on the device, the lock pin 60A on the recording/reproducing rod 54 is moved to the lock plate 5.
The lock is held by 6. Recording and playback rod 5
By releasing the restriction on the position of the first pawl 78 by the stop pin 80 of No. 4,
The clutch arm 76 rotates in the direction of arrow B, and the first idler gear 77 on the clutch arm 76 meshes with the first gear 70.

Here, since the capstan 38 is rotated in the direction of arrow E from the drive motor 30 via the motor pulley 32, belt 34 and flywheel 36, the rotation of the capstan 38 in the direction of arrow E causes the first idler gear 77 to rotate. The rotation of the second gear 74 in the direction opposite to the arrow B is transmitted through the drive gear 20A, thereby causing the drive gear 20A to move the movable body 18A in the direction of the arrow F, that is, in the tape loading direction.

As the moving body 18A moves in the direction of arrow F, the pin 106 provided on the moving body 18A
(see FIG. 2) moves in the direction of arrow F, and near the end of tape loading, the pin 106 hits the concave portion 104 of the tape loading end position detection member 98.
At the same time, the tape loading end position detecting member 98 is rotated in the direction of arrow G, and as the roller 96 is engaged with the protrusion 100 of the end cam, the end cam is rotated as shown in FIG. to the recess 108. As the roller 96 moves, the clutch release arm 82 moves toward the arrow C.
By rotating in the direction, the release pin 92 of the clutch release arm 82 is moved to the second position of the clutch arm 76.
the clutch arm 76 in the direction of arrow B.
Rotate it in the opposite direction. Then, the first idler gear 77 that had been meshed with the first gear 70 is released from the mesh, and the capstan 38
The transmission of the rotational force from to the moving body 18A is cut off, and the tape loading operation ends.

Furthermore, when the tape loading operation is completed, as shown in FIG.
00, and as a result, even when tension in the direction opposite to the arrow F is applied by the magnetic tape 24, the rotation of the tape loading end position detection member 98 in the direction of the arrow C is prevented. 96, the moving body 18A moves in the direction of arrow F.
It is designed so that it does not move in the opposite direction.

Next, the tape unloading operation will be explained.

Now, when the stop button 66 is pushed in the direction of arrow G in the tape loading completion state shown in FIG. , the lock plate 56 is moved in the direction opposite to arrow A against the tension spring 64. Then, the lock pin 60A on the recording/reproducing rod 54 is unlocked, and the recording/reproducing rod 54 moves in the direction of arrow D.
Move in the opposite direction and return. Then, regulation hole 6
0 is moved in the direction opposite to arrow C, the end cam of roller 96 is disengaged from recess 108, and tape loading end position detection member 98 is moved in the opposite direction to arrow G. It becomes possible to rotate in the direction of.

In addition, when the stop button 110 is operated, a switch (not shown) provided at a suitable location on the main body is actuated to energize the solenoid 114, and the solenoid bar 116 connected to the plunger of the solenoid 114 is supported. It rotates about the shaft 117 from the position shown by the solid line to the position shown by the chain line. A part of the solenoid lever 116 includes
A bent piece 120 that can come into contact with the side edge of the idle alarm 118 is formed.
The rotation in the direction of arrow H is restricted.

The base of the idler arm 118 is connected to the support shaft 1.
A lever 12 is rotatably attached to the lever 17 and has a second idler gear 122 at its tip.
1 is rotatably attached. Note that this idler arm 118 is urged to rotate in the direction of arrow H by a tension spring 124. By configuring the idler arm 118 in this way,
As the solenoid 114 performs the suction operation, the second idler gear 122 shifts to the first gear 7 as shown by the chain line.
0 and the first idler gear 77, and transfers the rotational force of the capstan 38 to the first gear 70, the second idler gear 122, and the first idler gear 77.
The movable body 18A is moved back in the direction opposite to the arrow F (unloading direction) via the idler gear 77, the second gear 74, and the drive gear 20A. Note that when the moving body 18A is moved in the unloading direction, the tape drawing member 1
When 6A returns from the second position shown in FIG. 4 to the second position shown in FIG. As a result, the solenoid lever 116 and the idler arm 118 return to rotation in the direction opposite to the arrow H, and the second idler gear 122 engages (joins) the first gear 70 and the second idler gear 77. ) is released, and the drive of the moving body 18A in the tape loading direction is stopped.

The tape loading and unloading operations have been described above on behalf of the movable body 18A, but the other movable body 18B is similarly configured to move the movable body 18A at the same time by the drive gear 20B. There is. That is, it is configured to move in the direction of the arrow during tape loading and in the opposite direction to the arrow during tape unloading.

In the above description, a capstan was used as a drive unit of a moving body for tape loading, but the present invention is not limited to this, and the present invention is not limited to this, but a reel stand that is rotationally driven by a capstan motor. Alternatively, a rotating body exclusively for tape loading, which is rotationally driven by a capstan motor, may be used. In short, any device can be used as long as it rotates by receiving power from a drive source that rotationally drives the capstan.

As is clear from the above description, according to the present invention, there is no need to provide a dedicated motor for loading or unloading the tape.
This makes it possible to realize an extremely small and lightweight VTR at low cost.

In particular, the present invention provides a detection lever member (corresponding to 98 in the same embodiment) constituting the tape loading end position detecting means when the protrusion (corresponding to 106 in the above embodiment) provided on the movable body is placed at the tape loading end position. ), the detection lever member is rotated and displaced, and an end surface cam portion is formed that causes the detection lever member to undergo a sudden displacement, and the rotation of the detection lever member causes the end surface cam portion to be rotated. The cam follower of the release lever member (corresponding to 28), which follows the release lever member (corresponding to 28), makes a sudden displacement. A first gear member (corresponding to 70) and a second gear member (74) are connected by an idler gear member (corresponding to 77, 122) which constitutes a clutch means by rapid rotation of the release lever member. By configuring the device to release the connection between the tape-loading device and the tape-loading device (corresponding to be.

[Brief explanation of the drawing]

Fig. 1 is a plan view of essential parts of an embodiment of the present invention, Fig.
3 and 4 are partially cutaway enlarged plan views of essential parts in each state of the same embodiment. 10...Substrate, 12...Rotating magnetic head, 14
... Tape guide drum, 16A, 16B ... Tape drawer member, 18A, 18B ... Moving body, 2
0A, 20B... Drive gear, 21... Tape cassette, 24... Magnetic tape, 30... Drive motor, 36... Flywheel, 38... Capstan, 40... Pinch roller, 50A, 50B...
...Positioning member, 52A, 52B, 52C, 52
D... Tape guide, 53... Recording and playback operation button, 54... Recording and playback rod, 56... Lock plate, 66... Stop button, 70... First gear,
72... shaft, 74... second gear, 76... clutch arm, 77... first idler gear, 82
...Clutch release arm, 86...Tension spring, 9
6...Roller, 98...Tape loading end position detection member, 100...Convex portion of end cam, 10
4... Recess, 108... End cam recess, 114
... Solenoid, 116 ... Solenoid lever,
118...idler arm, 122...second idler gear, 124...tension spring.

Claims (1)

[Claims] 1. A tape guide drum incorporating a rotating magnetic head for at least one of recording and reproducing video signals, and a tape guide drum for loading or unloading a magnetic tape onto or from the tape guide drum by moving along the circumference of the tape guide drum. a ring-shaped moving body for dewinging the magnetic tape; a capstan for moving the magnetic tape at a constant speed in a predetermined direction in cooperation with a pinch roller; and a capstan for rotating the capstan by receiving power from a drive source. a clutch means including a first gear member that drives the movable body, a second gear member that drives the movable body, and an idler gear member that can bring the first gear member and the second gear member into a coupled state and a non-coupled state; Recording and reproducing operation means capable of instructing recording or reproducing on a magnetic tape and actuating the clutch means to move the idler gear member so that the first gear member and the second gear member are in a coupled state. and is capable of detecting a tape loading end position of the movable body, and is interlocked with the clutch means, and when the tape loading end position is detected, the idler gear member of the clutch means is connected to the first gear member and the first gear member. tape loading end position detecting means for moving the second gear member to an uncoupled state; and by operating the recording/reproducing operation means, rotational force from the drive source is transferred from the first gear member to the tape loading end position detecting means. The tape loading end position detecting means transmits the signal to the second gear member via the idler gear member, moves the moving body in the tape loading direction, and when the moving body moves to the tape loading end position. is configured to stop the operation of the clutch means and to release the connection between the first gear member and the second gear member by the idler gear member, thereby stopping the tape loading operation of the movable body. At the same time, the tape loading end position detecting means is rotatably provided near the movable body, and a part thereof is engageable with a protrusion of the movable body, and the other part is provided with an end face cam. and a release lever member having a cam follower that follows the end cam part in one part and a release part that engages with the clutch means in the other part. By operating the means, the tape loading operation by the movable body is performed, and near the end of the tape loading of the movable body, the protrusion of the movable body comes into contact with one end of the detection lever member, and the detection lever member As a result of the rotational displacement of the detection lever member, the cam follower that follows the end cam portion of the detection lever member undergoes a sudden displacement, and in response to the displacement of the cam follower, the release portion of the release lever member operates the clutch means to release the idler gear member. A magnetic tape device characterized in that the tape loading operation of the movable body is stopped by releasing the coupling between the first gear member and the second gear member.