JPS5921092B2 - tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder with a moving head stand.

In conventional tape recorders, as shown in Figure 1,
The head stand 1 is pulled by the spring 2 and is in a retracted position where it comes into contact with the clasp 3, and when recording and playing back, a push button (not shown) is pressed.
is pressed to move the bar 4 forward, and the head 1 is moved through the spring 5.
was moved forward, and the pinch roller 6 was brought into pressure contact with the capstan T, and the heads 81 and 82 were brought into contact with the tape (not shown).

In the conventional head moving mechanism described above, the bar 4 must be moved forward by pressing the push button with a large force against the attractive force of the spring 2, and also because the spring 5, which absorbs the movement impact of the head stand, is stretched. Another disadvantage was that the forward stroke of the bar 4 had to be longer than the forward stroke of the head stand 1.
Although there is a method of using an electromagnet to eliminate the drawbacks of the conventional head moving mechanism described above, it requires an extremely large electromagnet, so it can only be used in expensive tape recorders with limited applications.

The present invention is a head stand moving mechanism for a tape recorder, the object of which is to enable the head stand to be moved reliably by simply pressing a recording/reproducing push button with a light force and a few strokes.

Next, the structure of an embodiment of the present invention will be explained with reference to the drawings. In FIG. 2 showing the embodiment of the present invention in a plan view, a head 91,
92, the head stand 11 provided with the pinch roller 10 is
The elongated hole 13 is engaged with the guide pin 12, and it is pulled by the spring 14 and comes into contact with the catch 15, so that it is in the retracted position. Note that a pin 18 of an L-shaped lever 17, which will be described later, is engaged with another elongated hole 16 of the head stand 11. 19 is a motor pulley, 19' is a friction drive wheel integral with the motor pulley 19, 20 is a belt,
21 is a flywheel, 21' is the flywheel 2
A capstan 22 is the same as 1, and 22 is an intermediate wheel moving lever whose one end is pivotally supported by a shaft 23 of a chassis (not shown).A floating intermediate wheel 24 is supported in a long hole at the other end. The other end b of the intermediate wheel moving lever 22 is biased in the clockwise direction by a spring 25 connected to a shaft (not shown) at the top of the page so as not to interfere with the rotation of the intermediate wheel moving lever. 027 in contact with 26 is a recording/playback push button, 28 is a connecting lever, 29 is a lever pivotally supported on the shaft shaft 30, and 31 is connected to one end of the lever 29 and the tip of the intermediate wheel moving lever 22. 32 is a friction driven wheel pivotally supported on a fixed shaft; 33 is a drive wheel that is the same as the friction driven wheel 32; 34 and 35 are intermediate wheels that are the same; 36 is a cam wheel; and 37 is the aforementioned friction driven wheel. Scroll cam, 17, which is the same as the cam wheel 36
is an L-shaped lever that is pivotally supported on the shaft 38 of the chassis, and the pin 18 at one end engages with the elongated hole 16 of the head stand 11, and the pin 39 at the other end engages the L-shaped lever 40 as shown in FIG. A pin 41 at the tip of the L-shaped lever 40 is engaged at a contact position near the axis of the scroll cam 37.

Further, 42 is a set arm capable of lifting the tip of the L-shaped lever 40, 43 is a connecting lever that transmits the forward movement of the head stand 11 to the intermediate wheel moving lever 22, and 44 is a reel shaft. Next, the operation of the embodiment of the present invention will be explained with reference to the drawings.

In FIG. 2, when the recording/playback push button 27 is lightly pressed with a slight stroke, the lever 29 is rotated in the opposite clockwise direction about the shaft 30, and the spring 3 connected to the other end is rotated.
The intermediate wheel moving lever 22, which is pivotally supported by the shaft 23 via the spring 25, is rotated in the opposite clockwise direction against the spring 25.
By moving one end a to the opposite side of the line connecting the other end b and the shaft 23, the intermediate wheel moving lever 22 is biased in five clockwise directions by the spring 25, and the tip of the intermediate wheel moving lever 22 is biased in five clockwise directions. Idle intermediate wheel 24 supported in a long hole
is simultaneously pressed against the friction drive wheel 19' and the friction driven wheel 32 to transmit the rotation of the motor (not shown) to the friction driven wheel 32,
A driving wheel 33 that is the same body as the friction driven wheel, an intermediate wheel 34 that is the same body,
35, through the cam wheel 36, rotate the scroll cam 37, which is the same body as the cam wheel 36, in the opposite clockwise direction.
1 along the rotating scroll cam 37 and move it to the left via the L-shaped lever 40 and pin 39. L-shaped lever 17
is rotated in the opposite clockwise direction about the shaft 38 as a fulcrum, and the head stand 11 whose elongated hole 16 is engaged with the pin 18 at the tip of the L-shaped lever 17 is advanced against the attractive force of the spring 14. 4
As shown in the figure, the pinch roller 10 is connected to the capstan 2'
At the same time, the heads 91 and 92 are brought into contact with the tape (not shown). Further, as the head stand 11 moves forward, the connecting bar 43 moves forward and comes into contact with the intermediate wheel moving lever 22, as shown in FIG. The spring 25 rotates in the direction of rotation.
One end a crosses the line connecting the other end b and the shaft 23, and the intermediate wheel moving lever 22 is biased in the clockwise rotation direction with one end a crossing the line connecting the other end b and the shaft 23, and the intermediate wheel moving lever 22 is pressed against the stopper 26 to move the idle intermediate wheel 24 to the friction drive wheel 1.
9 (separated from the friction driven wheel 32. Therefore, the scroll cam 37 keeps the pin 41 engaged in the contact position far from the camshaft and keeps the head stand 11 in the forward position. Next, move the head stand 11 to the forward position. To move it backward, the tip of the set arm 42 is raised by a mechanism (not shown) connected to the stop push button 45 in FIG. 4, and the position shown in FIG. 7 is changed from the state shown in FIG. Then, the head stand 11 is pulled by the spring 14 and returns to the retracted position shown in FIG. Return to the position shown in the figure.

FIG. 8 is a partial plan view of another embodiment of the present invention, in which the lever 29, shaft 30, and spring 31 are removed from the embodiment shown in FIG. By changing the position of the shaft 23 and the mounting position of the spring 25, the intermediate wheel moving lever 22 can be directly pressed by the connecting bar 43, and the intermediate wheel moving lever 22 can be pressed directly by the connecting bar 28.
is rotated in the opposite clockwise direction, and the floating intermediate wheel 24 is simultaneously pressed against the friction drive wheel 192 and the friction driven wheel 32 as shown by the dotted line due to the overcenter of one end a of the spring 25.

The forward movement of the connecting bar 43 rotates the intermediate wheel moving lever 22 at the position shown by the dotted line in the clockwise direction, and the overcenter of one end a of the spring 25 moves the idle intermediate wheel 24 to the friction drive wheel 19' and the friction driven wheel. Continuing to maintain the state separated from 32 is the same as in the previous embodiment. Further, an electromagnet (not shown) is provided which can be energized each time the recording/reproducing push button is pressed, and the floating intermediate wheel 24 is brought into pressure contact with the friction drive wheel 19' and the friction driven wheel 32 by the attraction force of the electromagnet. The electromagnet may be de-energized when the head stand 11 reaches a predetermined position. Also, when used as an automatic tape recorder,
Reel/Twin/Reel type power set with built-in tape,
By detecting that it is set on the reel shaft 44 using a micro switch or the like and activating the electromagnet, the head stand 11 can be easily moved to the recording/playback position.

Furthermore, even when recording and playback are finished and the head stand 11 is moved back, the end of the tape wound on the supply reel can be detected using a known technique without using the stop button 45. By using the sensing mechanism, other electromagnets can be energized to operate the set arm 42.

As described above, according to the present invention, the head stand that is in the retracted position due to the spring can be easily advanced to the recording/playback position using the rotational force of the motor, and the head stand that is in the recording/playback position is It can be easily set to the retracted position by disengaging from the cam.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of a head stand of a conventional tape recorder. FIG. 2 is a plan view of an embodiment of the present invention. FIG. 3 is a partial side view of the vicinity of the shaft 38 shown in FIG. 2. Figure 4 shows
FIG. 3 is a plan view showing the operating state of the embodiment of the invention shown in FIG. 2; FIG. 5 shows the scroll cam 37 and pin 41 in FIG.
FIG. FIG. 6 is a sectional view showing the engagement between the scroll cam 37 and the pin 41 in FIG. 4.
FIG. 7 is a sectional view showing the relationship between the floating pin 41 and the scroll cam 37 when the tip of the L-shaped lever 40 is lifted by the set arm in FIG. FIG. 8 is a partial plan view of another embodiment of the invention. 1...
...Head stand, 2...Spring, 3...
Clasp, 4...Bar, 5...Spring, 6.
...Pinch roller, 7...Capstan, 81,82...Head, 91,92...
...Head, 10...Pinch roller, 11...
... Head stand, 12 ... Guide pin, 13
...Long hole, 14...Spring, 15...
... Clasp, 16... Long hole, 17...
L-shaped lever, 18...pin, 19...
Motor pulley, 19'...Friction drive wheel, 20.
...Belt, 21...Flywheel,
2...capstan, 22...intermediate wheel moving lever, 23...shaft, 24...
Idle intermediate wheel, 25... Spring, 26...
Clasp, 27...Push button for recording and playback, 28...
...Connection bar, 29...Lever, 30...
... shaft, 31 ... spring, 32 ... friction driven wheel, 33 ... drive wheel, 34, 35 ...
...Intermediate wheel, 36...Cam wheel, 37...
・Scroll cam, 38...Axis, 39...
...Pin, 40...L-shaped lever, 41...
...Pin, 42...Reset arm, 43...
...Connection bar, 44...Reel shaft, 45.
...Push button for stop, A, b...Both ends of the spring.

Claims (1)

[Claims] 1 (a) A head stand having at least a magnetic head, and (
(b) A spring provided to isolate the head stand from the capstan, (c) A rotatably provided moving lever, (
d) an intermediate wheel supported by the moving lever and in contact with the rotating shaft of the motor, and (e) movement to move the intermediate wheel to a position where it is in contact with the rotating shaft of the motor by movement of the recording/playback push button. (f) a cam wheel having a cam on one surface and rotated by the intermediate wheel that is in contact with the rotating shaft of the motor; and (g) a cam wheel that is in contact with the cam surface and that rotates according to the rotation of the cam wheel (h) a driven lever for moving the intermediate wheel to a position away from the rotating shaft of the motor in connection with the movement of the head stand to a predetermined recording and playback position; A tape recorder comprising a switching means (i) and a holding means for selectively holding the intermediate wheel in two positions, a position in contact with the rotating shaft of the motor and a position away from it.