JPS6126143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes the rotational force of a single drive gear to move the head board to the performance position at the start of a performance and to switch the tape running direction when switching the tape running direction. The present invention relates to a reciprocating magnetic recording and reproducing device configured to operate using a trigger means.

Embodiments of the reciprocating magnetic recording and reproducing apparatus of the present invention shown in the drawings will be described below.

FIG. 1 shows a plan view of a reciprocating magnetic recording and reproducing apparatus according to the present invention, in which a cassette 1 is loaded in a vertical direction at a performance position, but the loading method is not particularly illustrated because it is not directly related to the present invention. do not have. Reference numeral 2 designates a head board on which a magnetic head 3 and pinch rollers 4, 4' are mounted, chassis shafts 5, 5' are housed in elongated holes 6, 6', and is installed to be able to slide left and right. is energized and moved to a non-playing position away from the cassette 1.

8 and 9 are reel shafts, and a clutch mechanism (not shown) is provided below, and a clutch operating plate 1
The clutch mechanism is controlled by the engagement of the tapered step portions 11, 11' of 0 and the clutch levers 12, 12', and the clutch actuating plate 10 associated with the tape running direction switching mechanism is slid in the front and rear direction. The movable reel shafts 8 and 9 are configured to be selectively driven. Reference numeral 13 denotes a control shaft 15 which is pivotally connected to the chassis shaft 14 and fixed at one end, and is engaged with a cam groove 16 formed on the head board 2, and at the other end is an engaging tooth that meshes with a gear 17 formed on the reel shaft 8. When the head board 2 is in the non-playing position away from the cassette 1, the rotation prevention lever 13 is rotated counterclockwise by the cam groove 16.
The engaging teeth 18 mesh with the gear 17 of the reel shaft 8 to forcibly stop the rotation of the reel shaft 8, and when the head board 2 moves toward the cassette 1, it is rotated counterclockwise through the cam groove 16 and the gear 17 is rotated counterclockwise through the cam groove 16. The engagement with is released.

Reference numeral 19 denotes a starting gear whose rotation is prevented by a trigger lever 20, and whose toothless portion 21 is normally opposed to a drive gear 23 which is constantly rotated by a motor 22, and forcibly stops the rotation of the reel shaft at the start of a performance. When the trigger lever 20 is moved in the direction of the arrow and rotated counterclockwise due to the activation of a tape end detection device (not shown) in connection with this state, the starting gear is activated. When the starting gear 19 is disengaged from the locking pin 24 installed below the starting gear 19, the starting gear 19 is slightly rotated by a counterclockwise biasing force (not shown) acting on the starting gear 19, and meshes with the driving gear 23. rotated once.

Reference numeral 25 is pivotally supported by a chassis shaft 26, and one end faces a position where it engages with a bent piece 27 of the head board 2, and a spring 28 is installed between the head boards 2.
The activation lever is connected to the head board 2 by the activating lever 25, and has an engaging piece 30 at the other end that comes into contact with a drive shaft 29 provided on the activation gear 19. It is rotated counterclockwise by the drive shaft 29 and moved from the non-operating position to the operating position.

Reference numeral 31 denotes a holding lever that is pivotally supported by the chassis shaft 32 below the starting lever 25, and a connecting pin 33 implanted in the center is located in a cam hole 34 formed in the starting lever 25, and is provided between the chassis. spring 35
It is connected to the activation lever 25 by being biased counterclockwise by. Further, an adsorbent 37 that is attracted to an electromagnet 36 is provided at the end of the holding lever 31, and when the starting lever 25 is rotated counterclockwise, the holding lever 31 is also rotated counterclockwise by the spring 35. When the actuating lever 25 is moved and the attracting element 37 is attracted to the electromagnet 36, the actuating lever 25 is held in the operating position. At this time, the activation lever 25
In order to reliably move the head board 2 to the playing position and ensure that the suction element 37 and the electromagnet 36 are attracted,
The amount of rotation of the starting lever 25 is set to be slightly larger than the amount of movement of the head board 2, and when the head board 2 is moved to the performance position, the connecting pin 33 of the holding lever 31 and the cam hole 34 of the starting lever 25 engage. It is configured to rotate slightly clockwise until it returns.

39 is a drive gear 23 when switching the tape running direction.
It is a reversing gear that is driven half a rotation by meshing with the clutch actuating plate 10 to switch the clutch actuating plate 10 between two positions, and is provided with toothless portions 40, 40' at two locations, and has a protruding shaft implanted at an upper eccentric position. 41 is engaged with the clutch actuating plate 10, and the lock lever 43 is engaged with either one of the projecting pins 42, 42' protruding from two locations below, whereby the lock lever 43 is provided by a spring (not shown). The counterclockwise rotational force is blocked, and one toothless portion 40 is connected to the drive gear 2.
3, so that it is not normally driven, but is driven when the lock lever 43 releases the lock when switching the tape running direction.

44 is slid to the right when the trigger lever 20 is triggered and rotated in the direction of the arrow when the tape running direction is changed, and the lock lever 43 is rotated clockwise against the bias of the spring 45 to lock the lock lever 44. This connection lever is used to release the lever, and is mounted so that by housing the chassis shaft 46 in the small hole 47, it slides to the right against the bias of the coil spring 48 when the trigger lever 20 rotates.
(see figure), 49 is the chassis shaft 50, 50'
1, 51', one end of which is pressed against the head board 2 by the force of the spring 52, and the other end of which faces the position where it comes into contact with the connection lever 44;
In the non-performance state, the control lever 4 is controlled by the head board 2.
9 is moved backward against the spring 52, the connecting lever 44 is rotated counterclockwise against the coil spring 48, and in the playing state, the spring is moved as the head board 2 moves to the playing position. 5
2, and is engaged with the recess 53 formed in the head base plate 2, whereby the engagement with the connecting lever 44 is released.

Next, the operation of the present invention having such a configuration will be explained.

First, when the cassette 1 is loaded into the playing position by a cassette loading device (not shown), the drive mechanism is started. At this time, head board 2 is still in cassette 1.
Although the head board 2 is moving away from the cassette 1, the engaging teeth 18 of the rotation prevention lever 13 are engaged with the gear 17 of the reel shaft 8, and the head board 2 is moving away from the cassette 1. The reel shafts 8 and 9 are forcibly set to a stopped state.

Therefore, a tape end detection device (not shown) is activated, and the trigger lever 20 is triggered counterclockwise, so that the starting gear 19 is unlocked, engages with the drive gear 23, and is driven to rotate. As the starting gear 19 rotates, the drive shaft 29 comes into contact with the engagement piece 30 of the starting lever 25, and the starting lever 25 is rotated counterclockwise around the chassis shaft 26, thereby connecting the starting lever 25 and the spring 28. The magnetic head 2 pinch rollers 4 and 4' are loaded into the cassette 1 and are prevented from rotating through the cam grooves 16. When the lever 13 is rotated counterclockwise and the forced stop of the reel shaft 8 is released, the reel shafts 8 and 9 start rotating and enter a playing state (see FIG. 10).

The starting gear 19 rotates once and stops rotating when the toothless portion 21 faces the driving gear 23, and is locked again by the trigger lever 20. At this time, when the starting lever 25 is rotated counterclockwise, the holding lever 31 is also rotated counterclockwise under the bias of the spring 35, so that the attracting element 37 is attracted to the electromagnet 36. In order to ensure that the head board 2 is moved to the performance position even after the adsorption, the activation lever 25 is further rotated slightly by the drive shaft 29 even after the head board 2 has been moved to the performance position (see Fig. 8). When the contact between the drive shaft 29 and the engaging piece 30 of the starting lever 25 is released by the rotation of the starting gear 19, the cam hole 34 contacts the connecting pin 33 of the holding lever under the bias of the spring 28. The activation lever 2 is rotated clockwise and engaged with the connecting pin 33 positioned by the electromagnet 36.
5 is held in the rotational position, and holds the head board 2 in the rightward sliding position, that is, the playing position (see FIG. 9).

Also, at this time, the trigger operation of the trigger lever 20 is transmitted to the connecting lever 44;
is rotated counterclockwise by the control lever 49 and disconnected from the lock lever 43, and movement of the connection lever 44 to the right is controlled by the lock lever 43.
(See Figure 4). Therefore, the reversing gear 39 is not driven and the tape running direction is not switched. Thereafter, as the head board 2 is moved to the playing position, the control lever 49 is moved forward, and the connecting lever 44 is rotated back to the position where it comes into contact with the lock lever 43 during playing (see Fig. 5). ).

Next, when the end of the tape is reached during performance, the rotation of the reel shafts 8 and 9 is stopped, so that the tape end detection device is activated as described above, and the trigger lever 20 is triggered counterclockwise. The trigger operation of the trigger lever 20 is performed by the connecting lever 44.
When the lock lever 43 is rotated clockwise against the bias of the spring 45 to release the lock of the protrusion pin of the reversing gear 39 (see Fig. 6), the lock lever 43 is rotated counterclockwise. Reversing gear 39 to which rotational force in the direction is applied
is meshed with the drive gear 23 and driven to rotate.
When the reversing gear 39 is rotated half a rotation, the toothless portion 4 is turned again.
0' faces the drive gear 23, and the protrusion pin is further locked by the lock lever 43, so that rotation is stopped. At this time, by half a rotation of the reversing gear 39, the clutch actuating plate 10 is moved to the other position, and a tape running direction switching mechanism (not shown) is operated to switch the tape to run in the opposite direction. At this time, when the trigger lever 20 is rotated, the starting gear 19 rotates once as described above, but the head board 2 remains held at the playing position as shown in FIG. 10.

Next, when the power is cut off during a performance, the electromagnet 36 is demagnetized, the holding lever 31 is released, and the head board 2 is slid to the left under the force of the spring 7. It moves away from the cassette 1 and comes to a halt. At this time, the cassette 1 is not ejected and is held at the playing position, but the head board 2
Since they are separated, there is no problem. Also head board 2
When the rotation prevention lever 13 returns to the left, the rotation prevention lever 13 is rotated counterclockwise, and the reel shaft 8 is forcibly stopped. Therefore, when the power is turned on again, the performance state can be obtained in the same manner as described above.

As described above, the reciprocating magnetic recording and reproducing apparatus of the present invention includes a head board on which a magnetic head is mounted and moves between a non-performance position, a drive gear rotated by a motor, and a drive gear that meshes with the drive gear as appropriate. a starting gear that rotates a predetermined angle, and a starting lever that moves from a non-operating position to an operating position and moves the head board to a performance position;
a control lever that responds to the movement of the head board to a playing position; a reversing gear that meshes with the drive gear as appropriate; a tape running direction switching mechanism that is activated when the reversing gear rotates by a predetermined angle; and a common trigger means that operates to engage the starting gear and the reversing gear with the single driving gear when the tape running direction is switched, and the trigger means is not triggered for the reversing gear until the control lever responds to the operation. Since it is configured to enable operation, the rotational force of a single drive gear is used to move the head board to the performance position at the start of a performance and to switch the tape running direction when switching the tape running direction. Moreover, it can be carried out using a common trigger means, which is extremely advantageous because the structure is simplified and the number of mechanism bases can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the reciprocating magnetic recording and reproducing device of the present invention in a stopped state, FIG. 2 is a view showing the main parts of FIG. 1, FIGS. 3, 4, 5, 6, Figure 7,
FIGS. 8 and 9 are diagrams showing operating states of the main parts of FIG. 1, and FIG. 10 is a diagram showing a reproduction state. 1...Cassette, 2...Head board, 8, 9...
...Reel shaft, 19... Starting gear, 20... Trigger lever, 23... Drive gear, 25... Starting lever, 39... Reversing gear, 36... Electromagnet,
49...Control lever.

Claims (1)

[Claims] 1. A head board on which a magnetic head is placed and moves between a non-playing position and a playing position, a driving gear rotated by a motor, a starting gear that meshes with the driving gear as appropriate, and a head board that moves the magnetic head between a non-playing position and a playing position; An actuating lever that moves from a non-operating position to an operating position by angular rotation and moves the head board to a playing position, a control lever that responds to movement of the head board to the playing position, and meshes appropriately with the drive gear. a reversing gear; a tape running direction switching mechanism operated by rotating the reversing gear by a predetermined angle; and a mechanism for meshing the starting gear and the reversing gear with a single drive gear at the start of performance and when switching the tape running direction. 1. A reciprocating magnetic recording and reproducing device, comprising a common trigger means for performing a trigger operation, and the trigger means is configured such that a trigger operation for a reversing gear is enabled only by a responsive operation of the control lever.