JPH01122049A - Head shifting mechanism - Google Patents

Abstract

PURPOSE:To miniaturize and simplify a device by surely executing a play position and head shifting by the structure deciding the turning direction of 1st and 2nd rotary members according to the rotary direction of the cam gear of positive and reverse rotary type. CONSTITUTION:The turning direction of a 1st turning member 2 and 2nd turning member 3 is decided by the rotary direction of a cam gear 1. A head plate is then adjusted to a play position by locking the engaging part of the head plate with the play position regulating part 4p of the position regulating hole 4 of the 2nd turning member 3 at playing time. On the other hand the head plate is regulated to quick winding position by locking the engaging part 5 to the quick winding side position adjusting part 4f of the position adjusting hole 4 of the 2nd turning member 3 at quick winding time. And by fixing the 2nd turning member 3 by exciting a solenoid 6, the head plate can be held at the quick winding position surely via the 2nd turning member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cassette tape player, and particularly to a 471 mechanism for performing head shifting.

(Prior technology) With the recent remarkable technological development and diversification of J:ru@Kyodenki, in addition to conventional radios and cassette tape players, videotape players and compact disc players are becoming popular as in-vehicle equipment. Installation is being considered and practical implementation is progressing. While the number of in-vehicle devices is increasing in this way, the installation space for the in-vehicle devices within the vehicle is limited, so there is a strong demand for smaller and simpler devices.

Under these circumstances, miniaturization and simplification of cassette tape players are being pursued, and as a link to this,
Instead of automatically loading a cassette, a configuration has been adopted in which the cassette is set on a reel by a pressing force and only the head is moved back and forth relative to the cassette tape.

With this configuration, there is no need for a drive motor or drive member for autoloading, and there is no need for space for moving the cassette, especially for vertical movement.
The mechanism has been significantly downsized and simplified.

By the way, as a result of the substantial downsizing and simplification of the configuration by omitting the loading mechanism, the next technical issue that is attracting attention is the improvement of the head shift mechanism that shifts the head plate to the operating position.

The head shift mechanism is a mechanism that shifts the head plate to a return position at the rear where the head and tape separate, a play position at the front where the tape is pressed against the head, and a fast winding position where the tape lightly contacts the head. The head plate is urged in the return direction by a spring, and when a play command or early spring command is issued, a cam gear is rotated by a drive motor, and the head plate is moved forward following the cam gear. A solenoid is usually used as a holding means for the head plate advanced to the play position or the fast winding position.

By the way, in the above-mentioned shift configuration, the position of the head play 1- cannot be determined by the amount of rotation of the cam gear due to gear meshing errors, parts precision, and limits of precision, etc. When the head plate is advanced to a predetermined position in response to a fast winding operation command, this must be detected and the position of the head plate must be regulated.

Therefore, in addition to the solenoid and the solenoid adsorption member,
There is a problem in that the number of parts increases and the configuration becomes larger and more complex, such as the need for head plate position detection means and position regulation means.

(Problems to be Solved by the Invention) The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to improve the play position and fast winding with a simpler configuration. It is an object of the present invention to provide a head shifter ljl'rF+ which is excellent in size and simplicity and can reliably perform a positional head shift.

[Structure of the Invention] (Means for Solving the Problems) The head shift mechanism in the present invention uses a cam gear that drives the head plate forward by forward rotation, and a first rotation that rotates in the rotational direction of the cam gear. and a second rotating member whose rotational position is regulated according to the rotational position of the first member.
A feature of the structure is that a position regulating hole having a fast winding side position regulating section one stage rearward from this hole is provided, and an engaging section provided on the head plate is inserted into the position regulating hole.

When playing, the cam gear is rotated forward and the second rotating member is rotated toward the play side, and the head plate is driven forward. During fast winding, the cam gear is first rotated slightly backwards and the second rotating member is rotated toward the playing side. At the same time as rotating the moving member to the fast winding side, the solenoid is energized, and the solenoid adsorption member
The rotating member is fixed, and then the cam gear is immediately reversed and rotated forward to drive the head plate forward.

(Function) In the present invention having the above configuration, the rotation direction of the first and second rotation members is determined by the rotation direction of the cam gear, and during play, the position regulation hole of the second rotation member is positioned on the play side. The head plate is regulated to the play position by locking the engaging part of the head plate to the position regulating part, and during fast winding, the head plate is engaged with the fast winding side position regulating part of the position regulating hole of the second rotating member. By locking the part, the head plate is set in the fast winding position, and by energizing the solenoid and fixing the second rotating member, the head plate can be reliably held in the fast winding position through the part. .

As described above, in the present invention, the head plate can be easily and reliably shifted with a simple configuration that uses a cam gear, a set of plungers and a solenoid adsorption member, and first and second rotating members, and the device can be moved easily and reliably. It can contribute to miniaturization and simplification.

(Embodiment) An embodiment of the head shift mechanism according to the present invention as described above will be specifically described with reference to the drawings.

Configuration of this embodiment* ■Head shift section...Figures 1 and 2Figures 1 and 2
In the figure, 1 rotates forward (clockwise) on a shaft 1a, and uses a power cam 1b provided on its upper surface to move the head plate (not shown in Figures 1 and 2) forward (upward in the figure).
This is a cam gear that drives the The cam gear 1 rotates forward (clockwise) during play, and during fast winding, it first rotates slightly backward (counterclockwise), then immediately reverses and rotates forward. In addition, the cam gear 1 has a coaxial (1a
) is attached to the first rotating member 2. Here, the cam gear 1 and the first rotating member 2 are pulled together so that there is a certain amount of friction between them, so that when the cam gear 1 rotates, the first rotating member 2 rotates in the same direction. ing.

On the opposite side of the first rotating member 2 from the cam gear 1, a second rotating member 3 is provided rotatably about a shaft 3a. This second rotating member 3 is provided with a regulated portion 3b,
The engaging protrusion 2a of the first rotating member 2 engages with this regulated portion 3b from the left side, so as to restrict the position of the second rotating member 3 to the right side. Further, the second rotating member 3 is biased to the left by a spring 3G, and the biasing force of this spring 3C is the 7th direction between the cam gear 1 and the first rotating member 2.
It is said to be smaller than a rickshaw.

In the center of the second rotating member 3, there is a
A long position regulating hole 4 is provided in the head plate, and an engaging protrusion 5 of the head plate is inserted into the elongated position regulating hole 4. Here, the position regulation hole 4 has a shape that widens from the rear toward the front, and a play side position regulation part 4p is provided on the right side at the front end.
On the left side, a fast winding side position regulating part 4f which is one step behind the play side position regulating part 4p is formed in a stepped shape. That is, the second rotating member 3 has a play position when it is rotated on the left side as shown in FIG. 1, and a fast winding position when it is rotated on the right side as shown in FIG.

On the other hand, numerals 6 and 7 in the figure represent a solenoid and a solenoid suction member that is suctioned to the solenoid. The solenoid adsorption member 7 is attached to the shaft 7
When the solenoid is attracted, it rotates counterclockwise in the figure, and locks the tip of the first rotating member 2 at the lock portion 7b provided at the other end on the solenoid attraction side. The engagement pin 2b provided in the section is locked.

Further, the solenoid 6 is energized during play and during early winding. That is, in this embodiment, by attracting the solenoid 6 during fast winding and fixing the first rotating member 2, the second rotating member 3 is indirectly connected to the second rotating member 3 through the engagement protrusion 2a.
The configuration is such that it is fixed.

■Drive unit...Figure 3 As shown in Figure 3, the power cam 1b of the cam gear 1 is engaged with the cam roller 8a of the power plate 8.
The power plate 8 moves back and forth (up and down in the figure) in accordance with the rotation of the power cam 1b. Also, the power plate 8 is pushed backward by the return spring 8b;
'', and this urging force serves as an engagement force with the power cam 1b.

A shift plate 9 is provided on the side of the power plate 8. The position of the engaging portion 9a provided at the rear end of the shift plate 9 is restricted from the rear by the suppressing portion 8C of the power play 1-8, and the shift plate 9 moves forward as the power plate 8 moves forward.

The head plate 10 is provided below the power plate 8 and is connected to the shift plate 9 by a connection spring 11 that is stronger than the return spring 8b of the power plate 8, and when the shift plate 9 moves forward, the head plate 10 is connected to the shift plate 9. The biasing force of the spring 11 causes the shift plate 9 to move forward together with the shift plate 9. Further, the head plate 10 is urged in the backward direction, which is the return side, by a return spring 10a having a smaller urging force than the connection spring 11. Note that 12 in the figure is a head.

Effects of this embodiment* The effects of this embodiment having the above-described configuration are as follows.

■During play...Figure 1 When a play command is given, the cam gear 1 rotates in the positive and clockwise directions as shown in Figure 1, and the first rotating member that has friction between it and the cam gear 1 rotates. 2 rotates in the same direction (training direction), that is, to the left in the figure, the second rotating member 3 is in a free state with respect to the first rotating member 2, and the spring 3G moves it to the play position on the left side in the figure. Rotate to.

As a result, as shown in FIG. 1, the engaging protrusion 5 of the head plate 10 comes to a position facing the play side position regulating part 4p. On the other hand, since the solenoid 6 is excited by the play command, the solenoid adsorption member 7 has its lock portion 7b
The engaging pin 2b of the first rotating member 2 is locked at , and the first rotating member 2 is fixed at the left rotating position.

On the other hand, when the cam gear 1 rotates clockwise, the power plate 8 moves forward via the cam roller 8a. As a result,
The shift plate 9 is moved by the suppressing portion 8G of the power plate 8.
moves forward, and this shift plate 9 and connection spring 11
The head plates 10 connected at 1 move forward.

Therefore, finally, the cam roller 8a of the power plate 8
When the power cam 1a reaches its maximum diameter, which is the drive end point, the engagement protrusion 5 of the head plate 10 is engaged with the play side position regulation part 4p of the position regulation hole 4, and the head plate 10 is fixed so that the head 12 is connected to the tape. It is fixed at the forefront play position where it is crimped to the

□■In early spring...Fig. 2 When the early winding command is issued, the cam gear 1 rotates slightly in the opposite direction (counterclockwise), and the first rotating member 2 rotates in the same direction (counterclockwise), immediately. Since the second rotating member 3 is rotated to the right in the figure, the second rotating member 3 is pressed by the engaging protrusion 2a, and rotates to the fast winding position on the side in the figure.

As a result, the engagement protrusion 5 of the head plate 10 comes to a position facing the fast-winding side position regulating portion 4f.

On the other hand, since the solenoid 6 is excited by the fast winding command, the solenoid adsorption member 7 moves to the first position at its locking portion 7b.
The engagement pin 2b of the rotating member 2 is locked, and the first rotating member 2
to the right rotation position.

Therefore, the second rotating member 3 is held at the fast winding position by the solenoid 6 via the first rotating member 2.

Further, the cam gear 1 immediately reverses and rotates in the forward direction after the second rotating member 3 is held at the upper winding position as described above.

As a result, the power plate 8 moves forward, as in the case of play, and the shift plate 9 and head plate 1 move forward accordingly.
0 moves forward.

During early winding, the engagement protrusion 5 of the head plate 10 engages the position regulating hole 4 before the cam roller 8a of the power plate 8 reaches the maximum diameter portion, which is the driving end point of the power cam 1a. The head plate 10 is latched by the side position regulating portion 4f, and is fixed at a fast winding position, which is slightly rearward of the foremost playing position and where the head 12 lightly contacts the tape.

Note that when the cam gear 1 is reversed, the first and second rotating members 2 and 3 are already held in the fast winding position by the solenoid 6 and the solenoid adsorption member, so they will not rotate due to the rotation of the cam gear 1. do not have.

As described above, in this embodiment, the cam gear 1' 1 does not require a means for detecting the position of the head plate.
By switching the rotational direction, the second rotating member of the position regulating means can be moved to the correct operating position, so that the head plate can be easily and reliably shifted to the play position and the fast winding position. In particular, this embodiment has a simple configuration that only uses the cam gear 1, the solenoid 6, the solenoid adsorption member 7, and the first and second rotating members 2 and 3, and does not require a position detection means as described above. This contributes to the miniaturization and simplification of equipment.

*Other Examples* Note that the present invention is not limited to the above-mentioned examples, and the shapes of the first and second rotating members and the solenoid adsorption member and the engagement configuration of each part can be selected as appropriate. The shape of the position regulating hole provided in the second rotating member can also be selected as appropriate. in this case,
The position regulating hole may have a branched shape instead of having a stepped shape as in the above embodiment.

Further, in the above embodiment, the second rotating member is indirectly held via the first rotating member, but it is of course possible to directly hold the second rotating member regulated by the first rotating member. It is. Roughly speaking, in the above embodiment, the solenoid was energized even during play, but the first rotating member was placed in a position that moved the second rotating member to the fast winding side when the head plate moved forward to the play position. It is sufficient if solenoid adsorption is not necessarily required.

[Effects of the Invention] As explained above, in the present invention, the rotation direction of the first and second rotation members is determined according to the rotation direction of the forward/reverse rotation type cam gear, and the play It is possible to provide a head shift mechanism that can reliably shift the head between the position and the fast winding position, has fewer parts than the conventional technology, and is excellent in size and simplicity.

[Brief explanation of the drawing]

1 to 3 are plan views showing an embodiment of the head shift mechanism according to the present invention, and FIGS. 1 and 2 respectively show the head shift portion during play and during fast winding. FIG. 3 is a plan view showing the return state of the drive section of the same embodiment. DESCRIPTION OF SYMBOLS 1... Cam gear, 1a... Shaft, 1b... Power cam, 2... First rotating member, 2a... Engaging protrusion, 2b
...Engagement pin, 3...Second rotating member, 3a...Shaft, 3b...Restricted portion, 3C...Spring, 4...
・Position regulation hole, 4p...Play side position regulation part, 4f.
... Fast winding side position regulating part, 5... Head plate engagement part, 6... Solenoid, 7... Solenoid adsorption member, 7a... Shaft, 7b... Lock part, 8... - Power plate, 8a... Cam roller, 8b... Return spring, 8C... Pressing part, 9... Shift plate, 9a... Engaging part, 10... Head plate, 10
a...Return spring, 11...Connection spring,
12...Head. 1 time t42 figure

Claims (1)

[Claims] a. A head is provided, a return position at the rear where the head and the tape separate, and a play position at the forefront where the tape is crimped onto the head;
and a head plate that takes a fast winding position where the tape lightly contacts the head. b. A cam gear that is equipped with a cam that drives the head plate forward by forward rotation, and rotates forward during play, and during fast winding, rotates slightly backward at first, then immediately reverses and rotates forward. c, a first rotating member that rotates in the rotational direction of the cam gear; d, a second rotating member whose rotating position is regulated according to the rotating position of the first member; e, a play side position regulating section provided on the second rotating member;
A position regulating hole formed by arranging a fast-winding side position regulating part one stage rearward from the hole in the rotational direction. f. An engaging portion provided on the head plate and inserted into the position regulating hole of the second rotating member. g, a solenoid suction member that is suctioned by the solenoid and fixes the second rotating member; h, Solenoid energized during fast winding. A head shift mechanism characterized by having the above configuration requirements a to h.