JPS642271Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for adjusting the lock position of a head board, and in particular, adjusts the position at which the head board is moved forward and locked by adjusting the angle of a lock pin attached to the head board. The present invention relates to a lock position adjusting device as described above.

When a tape recorder is placed in a recording/reproduction mode, for example, a head substrate to which a magnetic head is attached moves forward, and the front surface of the magnetic head comes into contact with the running magnetic tape. In this state, a locking pin provided on the head board engages with a lock lever or the like, so that the head board is locked in a predetermined forward movement position. However, in conventional tape recorders, the locking pins are directly fixed to the head board, making it extremely difficult to adjust the locking position of the head board. That is,
When adjusting the locking position of the head board after assembling a tape recorder, the conventional method is to forcibly bend the head board near the position where the pin to be locked is fixed, or to tilt the pin to be locked, or by using an electromagnetic magnet etc. that drives the lock lever. He was adjusting his position. However, with this method, workability is extremely poor and adjustment accuracy cannot be expected to be very high.

The present invention has been devised to correct the above-mentioned defects, and provides a lock position adjusting device for a head board that is structurally simple and that can adjust the lock position of the head board extremely easily and with high precision. The purpose is to

An embodiment in which the present invention is applied to a cassette tape deck will be described below with reference to the drawings.

As shown in FIG. 1, the mechanical chassis 2 of the cassette tape deck 1 includes a pair of left and right reel drive shafts 3, 4, a gear stamp shaft 5, and a pinch roller 6.
A pinch roller lever 7 that supports the head and a head board 8 that can move forward and backward in the vertical direction are provided, respectively. A recording/reproducing magnetic head 9 and an erasing head 10 are respectively mounted on the head board 8. In the forward mode, the head board 8 is moved forward to the position shown by the solid line in FIG. Recording and reproduction on the magnetic tape 11 are performed using the magnetic tape 11. In the queue/review mode, the head board 8 is moved to the position shown by the dashed line in FIG. 1 to perform automatic channel selection. However, in each of the stop, fast forward, and rewind modes, the head board 8 is moved back to the position shown by the two-dot chain line in FIG. 1 by the return spring 12. In addition, in FIG. 1, 13 is a tape cassette, 14, 15
1 is a pair of tape reels, 16 to 23 are tape guides, and 24 is a head pad.

On one side 8a of the head board 8, there are shown in FIGS.
As shown in FIG.
0 is set. This leaf spring 30 is fixed to the head board 8 with a fixing screw 31 at approximately the center in the front-rear direction, and a boss 33 of the head board 8 is inserted into a positioning hole 32 provided near the screw 31. There is. Specifically, the leaf spring 30 has a front end 30a and a rear end 30b that are slightly raised from the head board 8, as shown in FIGS. 4 and 5, and the cross section thereof is approximately doglegged. ing. Further, screw insertion holes 34 and 35 are provided in the front end portion 30a and rear end portion 30b, respectively, and adjustment screws 36 and 37 are inserted into the screw insertion holes 34 and 35, respectively.
The tips of the adjustment screws 36 and 37 are screwed into screw holes 38 and 39 provided in the head board 8, respectively. The tightening force of these adjustment screws 36 and 37 causes the first leaf spring part 40 on the rear half of the leaf spring 30 and the second leaf spring part 41 on the front half of the leaf spring 30 to elastically move toward the head board 8 side. It is in a bent state.

One side 8a of the head board 8 has two cutout recesses 43 and 44 as shown in FIGS. 1 and 2.
are formed in front and behind. On the other hand, the leaf spring 30
As shown in FIG. 4, a first locking pin 47 and a second locking pin 48 are implanted in substantially central portions of the first leaf spring portion 40 and the second leaf spring portion 41, respectively. ing. These locking pins 47 and 48 extend toward the mechanical chassis 2 through the notched recesses 43 and 44, and furthermore, the tip portions 47a and 48a of the respective locking pins 47 and 48 extend toward the mechanical chassis 2 in the front-rear direction (in the vertical direction in FIG. 4). ) protrudes to the back side of the mechanical chassis 2 through a pair of elongated holes 45 and 46 formed therein.

On the back side of the mechanical chassis 2, as shown in FIGS. 2 and 3, there are a first lock lever 49, a second lock lever 50, and two electromagnetic magnets 51.
52 are arranged respectively. The first and second lock levers 49 and 50 are provided with a fulcrum pin 53 and a fulcrum pin 53, respectively.
54, and is rotatably supported by the tension spring 5.
5 and 56, it is always urged to rotate counterclockwise in FIGS. 2 and 3. These lock levers 49, 50 include iron pieces 57, 58 and engaging claw portions 59,
60 each. When the iron piece 57 of the first lock lever 49 is attracted to one electromagnet 51 as shown in FIG.
9 engages with the first locking pin 47 of the leaf spring 30 to lock the head board 8 in the forward mode position. Further, when the iron piece 58 of the second lock lever 50 is attracted to the other electromagnetic magnet 52 as shown in FIG. , the head board 8 is locked in the queue/review mode position.

The head board lock position adjusting device is constructed as described above, and after assembling the cassette type tape deck 1, by rotating and adjusting the adjustment screw 37 or 36, the head board 8 can be set in the forward mode or queue review mode. The lock position in the mode is adjusted. Below, the adjustment operations will be described first with respect to the lock position adjustment in the forward mode, and then with respect to the lock position adjustment in the queue/review mode.

In the forward mode, as shown in Fig. 2, the head substrate 8 moves forward against the return spring 12, but the first locked pin 47 attached to the first leaf spring 40 engages with the engagement claw 59 of the first lock lever 49, so the forward movement of the head substrate 8 is locked. If the head substrate 8 is in a specified position in this locked state, there is no problem, but in reality, the lock position of the head substrate 8 varies due to the dimensional accuracy and installation error of various parts. Therefore, it is necessary to adjust the lock position after assembling the cassette type tape deck 1, but this adjustment can be easily performed by the lock position adjustment device of the present invention. That is, if the head substrate 8 protrudes a little too much and the magnetic head 9 is pressed too much against the magnetic tape 11, one of the adjustment screws 37 can be slightly tightened with a screwdriver. Then, the first leaf spring portion 40 bends elastically as shown by the chain line in Fig. 4, and the tip portion 47a of the first locked pin 47 is relatively displaced in the direction of the arrow a in Fig. 4. As a result, the head substrate 8 is moved back slightly in the direction of the arrow b in Fig. 4 by the return spring 12. Also, if the head substrate 8 does not protrude sufficiently, the adjustment screw 37 can be loosened a little.

On the other hand, in the queue review mode, as shown in FIG. 3, the second lock pin 48 implanted in the second leaf spring part 41 engages with the engaging claw part 60 of the second lock lever 50, thereby locking the head board. The return movement of 8 is locked. In this state, if the head board 8 is protruding a little too much, just loosen the adjustment screw 36 a little. Then, the second leaf spring portion 41 is elastically bent as shown by the chain line in FIG. 5, and the tip end portion 48a of the second locked pin 48 is relatively displaced in the direction of arrow c in FIG. Therefore, the head board 8 is moved back slightly in the direction of arrow d in FIG. 5 by the return spring 12. Furthermore, if the head board 8 is not protruding enough, the adjusting screw 37 may be tightened a little. Note that the decorative plate 64 covering the mechanical chassis 2 has an insertion hole 6 for inserting a screwdriver at this time.
5 should be set.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways. For example, in the above embodiment, the adjustment screws 36 and 37 are used as adjustment means for adjusting the angle of the locked pin by bending the leaf spring 30 against its elasticity, but various other adjustment means may be used. . Further, in the above embodiment, the first leaf spring part 40 and the second leaf spring part 4
1 and 2 are integrated, but it goes without saying that they may be separate bodies.

As described above, the present invention allows the angle of the engaged pin to be adjusted by attaching the engaged pin to the head board via a leaf spring, and adjusting the angle of the engaged pin by bending the leaf spring against elasticity using the adjusting means. Therefore, the engaged pin can be easily and accurately displaced, and the lock position of the head board can be adjusted with high precision without changing the locking mechanism of the engaged pin. I can do it. Furthermore, since it is extremely simple in structure and does not take up much space, it is possible to reduce the cost of the lock position adjustment device and contribute to making the tape recorder thinner.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette-type tape deck, and FIG. 1 is a front view in forward mode showing a tape cassette attached to the tape deck body with a portion cut away; Figure 2 is a front view of the main parts of the above with the mechanical chassis omitted, Figure 3 is a front view similar to Figure 2 in queue/review mode, and Figure 4 is an enlarged view of the main parts of Figure 2. FIG. 5 is a longitudinal sectional view showing an enlarged main part of FIG. 3. In addition, in the symbols used in the drawings, 8... Head board, 9... Magnetic head, 12... Return spring, 30... Leaf spring, 36, 37... Adjustment screw, 40... First leaf spring. part, 41... second leaf spring part, 47... first locked pin, 47a...
...Tip, 48...Second locked pin, 48a
... Tip part, 49 ... First lock lever, 50
. . . second lock lever, 59, 60 . . . engaging claw portions.

Claims (1)

[Scope of Claim for Utility Model Registration] a. A leaf spring with one end fixed to a head board to which a magnetic head is attached and moves back and forth; b. A locking pin implanted in the other end of the leaf spring; c. a locking member that locks the head board in a predetermined forward movement position by engaging with the tip of the locking member; d adjusting means that adjusts the angle of the locked pin by bending the leaf spring against its elasticity; , and the angle of the engaged pin is adjusted by bending the leaf spring against elasticity by the adjusting means, whereby the head board is locked by the locking member. A lock position adjusting device for a head board, characterized in that the position is adjusted.