JPH0113562B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a driving member that reciprocates in an arcuate trajectory and a driven member that is pulled by the driving member and moves approximately linearly. For example, when a tape player's loading mechanism, head crimping mechanism, etc. is operated using a drive source such as a motor, the link on the drive source side and the traction mechanism This relates to a lock mechanism used to maintain an engaged state with a member such as a loading mechanism.

[Technical Background of the Invention] Recently, automation of tape players has progressed, and an autoloading mechanism that automatically loads and ejects a cassette has been proposed. With this autoloading mechanism, when the cassette is inserted into the pack guide, the power switch is turned on, and then the driving force of the motor sets the cassette in the playing position on the reel base, and then moves the head forward. It automatically performs a series of operations to press the tape onto the tape. When the cassette is installed, the spring is stored with the driving force of the motor, and when the eject operation is performed, the stored spring force is released to move the head back from the tape, and then The cassette is taken out from the playing position to the outside of the tape player.

Compared to conventional manual loading mechanisms, tape players equipped with such an autoloading mechanism use the driving force of the motor to store the springs for retracting and ejecting the head, making it easier to load the cassette. It has the advantage that the movement can be performed with extremely light force.

Incidentally, in this type of tape player, it is necessary to transmit driving force from a motor serving as a driving source to various driven mechanisms such as a loading mechanism. In this case, the rotational force of the motor is generally converted into linear motion using a cam, but it is sufficient if the motor and the driven mechanism are installed in close proximity to each other. The motion is transmitted to a driven mechanism located away from the motor using a link.

FIG. 1 shows a conventional example of such a driving force transmission device, in which one arm 2a side of a link 2 rotatably attached to a support shaft 1 is driven by a motor to perform linear motion. It is connected to a member on the drive source side. A roller-shaped driving member 3 is provided at the tip of the other arm 2b of the link 2, and this drives the arm 2.
A stepped portion 4a of the driven member 4 extending in a direction substantially orthogonal to b.
engaged within. This driven member 4 has a stepped portion 4
At the end opposite to a, it is connected to a driven mechanism such as a loading mechanism or a head crimping mechanism,
Each mechanism is operated by the reciprocating movement of the driven member 4. Further, the stepped portion 4a in the driven member 4
A roller-shaped guide member 5 is provided on the back side of the link 2 , and the driven member 4 is held between this guide member 5 and the driving member 3 of the link 2 .

In such a conventional driving force transmission device, when the link 2 rotates in response to the driving force of the motor, the driving member 3 moves in an arc shape, and the driven member 3, which is engaged with this at the stepped portion 4a, moves in an arc shape. The member 4 is pulled along its length. Here, the driven member 4 has a stepped portion 4a.
Since it is supported by the guide member 5 from the back side of the drive member 3, even if the drive member 3 moves in an arc shape, the driven member 4 does not escape to the support shaft 1 side of the link 2, and the driven member 4 is connected to the stepped portion 4a and the drive member 3. is in a locked state and moves approximately linearly.

[Problems with the Background Art] However, in the above-mentioned device, since the sliding contact portion between the driven member 4 and the guide member 5 is linear, the driving member 3 that draws an arcuate trajectory has a stepped portion 4a. It will move back and forth within. Therefore, the stepped portion 4a
As such, a large one with a long contact portion with the driving member 3 is required, and the driven member 4 provided with this stepped portion 4a is
However, a wide width is required, which is one of the reasons for preventing the miniaturization of tape player parts. Furthermore, when the drive member 3 reciprocates within the stepped portion 4a, the frictional resistance when the driving member 3 and the stepped portion 4a slide is correspondingly large, and the driving force is not transmitted smoothly. The disadvantage arises that a roller must be used as the member 3.

[Object of the Invention] The present invention was proposed in order to solve the problems in the conventional driving force transmission device as described above. It is an object of the present invention to provide a locking mechanism for a downsized driving force transmission mechanism device that has less resistance and requires less width of a stepped portion.

[Summary of the Invention] The lock mechanism of the present invention has a sliding contact portion of the driven member with the guide member having an arcuate shape that protrudes toward the guide member in symmetry with the locus of the driving member. is guided by a guide member during movement to draw an arcuate trajectory, thereby eliminating the deviation in trajectory between the step portion of the driving member and the driven member,
This locks the two in such a way that the stepped portion can follow the driving member.

[Embodiments of the Invention] Hereinafter, embodiments in which the locking mechanism of the present invention is applied to a loading head crimping mechanism of a tape player will be described with reference to the drawings.

Lock mechanism...Figs. 3 to 6 In this embodiment, the stepped portion 4a formed on the driven member 4 has a dimension such that the engaged driving member 3 does not come off, for example, larger than the radius of the driving member 3 and smaller than the diameter. The width is also slightly narrower. The tip end edge of this stepped portion 4a forms an arcuate relief portion 4b that follows the locus of the roller-shaped drive member 3 of the link 2. On the other hand, the edge of the driven member 4 opposite to the stepped portion 4a protrudes in an arc shape toward the guide member in symmetry with the locus of the roller-shaped driving member 3.
This projecting portion serves as a sliding contact portion 4c with the roller-shaped guide member 5. Note that this driven member 4 is biased toward the opposite side of the driving member 3 (downward in the figure) by a spring 4d.

The guide member 5 is provided on the plunger link 10 in this embodiment. This plunger link 10 has a support shaft 11 at its center.
one arm 10 of which is rotatably attached to the
A suction piece 13 for the electromagnetic plunger 12 is provided at the tip of a, and this suction piece 13
Spring 1 that pulls the electromagnetic plunger 12 toward the electromagnetic plunger 12 side.
4 are provided. Note that this spring 14
The force is weaker than that of the spring 4d that pulls the driven member 4 described above. In addition, an electromagnetic plunger 1 is provided near the plunger link 10.
2 self-holding switch SW2 is arranged, and this self-holding switch SW2 is arranged on the plunger link 10.
A pressing piece 10b is formed.

On the other hand, the arm 10 on the opposite side of the plunger link 10
Reference numeral c represents a holding plate 15 of the head crimping mechanism, and this holding plate 15 is formed with an arc-shaped elongated hole 16 having a stepped portion 16a for engagement. A locking pin 18 of a head link 17 that interlocks with the head is inserted into this elongated hole 16. This head link 17 has a generally T-shape as a whole, and the lock pin 1 is attached to the tip of the vertical piece.
8, a head pressing pin 19 that interlocks with the head is provided at the tip of one horizontal piece. The head link 17 is urged clockwise about the support shaft 20 by a spring (not shown), that is, toward the backward direction of the head. Also, head link 1
7 is connected to the pulling plate 21 at its lock pin 18. That is, the pulling plate 21 is connected to the end of the driven member 4 at one end, and the lock pin 10 of the head link 17 is inserted into an engagement hole 22 formed in the pulling plate 21 at the other end. .

Drive mechanism...Figs. 7 and 8 A drive mechanism that is intermittently driven by a motor is connected to the other arm of the L-shaped link 2 having the drive member 3. As this drive mechanism, one having the following configuration is used, for example.

This drive mechanism includes a drive gear 30 that is constantly rotated by the driving force of a motor, and an intermittent gear 31 is provided on the side of this drive gear 30. This intermittent gear 31 has a notch 32 around which gear teeth are not formed, and when this notch 32 faces the drive gear 30, rotation from the drive gear 30 is prevented. If the transmission is not carried out and the position of the notch 32 is shifted, the drive gear 30
It is driven once again to the position of the notch 32 by the following steps. On the bottom surface of this intermittent gear 31,
A recess 33 is provided to match the position of the notch 32. The tip of a stopper 34 provided on the side of the intermittent gear 31 is engaged with this recess 33. This stopper 34 is urged by a spring 35 so that its tip always enters into the recess 33. This stopper 34
is removed from the recess 33 when the cassette is inserted or when the return lever is operated from the stopped state.

The stopper 34 is provided with a protruding switch pressing piece 36 separate from the engaging portion of the intermittent gear 31 into the recess 33, which faces the power supply switch SW1 for the motor and suction plunger provided near the stopper 34. ing. When the stopper 34 is engaged in the recess 33 of the intermittent gear 31, the switch pressing piece 36 turns off the power-on switch SW1 without pressing it, and the stopper 34 rotates counterclockwise. However, if it comes out of the recess 33, the power supply switch SW1 is pressed to turn it on. Note that this power-on switch SW1 is the self-holding switch
It is electrically connected in parallel with SW2.

A drive cam 37 is integrally formed on the surface of the intermittent gear 31, which consists of a drive part that expands in a spiral shape from the center, and a return part that runs on a substantially straight line connecting the largest diameter part and the smallest diameter part of the drive part. It is set in. A power plate 38 is disposed above the drive cam 37 so as to be able to reciprocate, and a roller-shaped cam follower 3 is provided on the lower surface of the power plate 38.
9 is in contact with the outer peripheral portion of the drive cam 37. The position of this cam follower 39 is the same as that of the intermittent gear 31.
is set to be located approximately at the center of the linear return portion of the drive cam 37 when the drive cam 37 is locked by the stopper 34. Further, the power plate 38 is pressed upward in the figure by a spring (not shown).

On the back side of such a power plate 38, there is an L
A drive plate 41 is connected via a letter-shaped link 40. The drive plate 41 is a plate-shaped member extending in the width direction of the tape player, and is supported by the tape player so as to be movable along its longitudinal direction. The L-shaped link 2 having the roller-shaped drive member 3 is connected to the opposite end (right side) of the drive plate 41 .

(2) Operation Next, the operation of this embodiment having the above configuration will be explained.

Stopped state of drive member...FIGS. 3 and 7 Since the tape player is in a power-off state before the cassette is inserted, the motor is stopped and the electromagnetic plunger 12 is not energized. At this time, the intermittent gear 31 of the drive mechanism is locked to the stopper 34,
The power plate 38 is stopped at a position where its cam follower 39 touches a substantially central portion of the linear return portion of the drive cam 37. Therefore, this power plate 3
The driving member 3 of the present invention, which is interlocked with the L-shaped link 40, the drive plate 41, and the L-shaped link 2, also stops slightly closer to the tip of the driven member 4 than the stepped portion 4a of the driven member 4. ing.

At this time, the guide member 5 supporting the driven member 4 from behind is connected to the plunger link 10 provided with the guide member 5.
Since it is not attracted to the electromagnetic plunger 12, it is movable to the side opposite to the stepped portion 4a, and the driven member 4 cannot be held between the guide member 5 and the driving member 3. Therefore, the driven member 4 is pulled toward the head crimping mechanism by the spring 4d.
The driving member 3 is not locked with the stepped portion 4a, but is in contact with a relief portion 4b formed at the tip side of the stepped portion 4a. As a result, although the plunger link 10 is pulled toward the electromagnetic plunger 12 by the spring 14, it is pressed by the driven member 4 pulled by the spring 4d and is moved to a position away from the electromagnetic plunger 12. be.

Start of locking operation...FIG. 4 When the stopper 34 of the intermittent gear 31 comes off as the cassette is inserted, the cam follower 39 of the power plate 38 pulled by the spring slides down the linear return portion of the drive cam 37. At this time, the intermittent gear 31 rotates slightly due to the pressing force of the cam follower 39, and the position of the notch 32 shifts, causing the intermittent gear 3
1 meshes with the drive gear 30. This stopper 34
When the stopper 34 is removed from the intermittent gear 31,
The pressing piece 36 presses the power supply switch SW1, and the motor is supplied with power and starts rotating.
The electromagnetic plunger 12 is also energized.

In accordance with this drawing operation of the power plate 38, the driving member 3 interlocked therewith moves slightly toward the proximal end of the driven member 4 and enters the stepped portion 4a. Then, the driven member 4 becomes movable toward the driving member 3 by the step portion 4a, and the plunger link 10, which had been pressed by the driven member 4, is moved by the spring 1.
4 and comes into contact with the electromagnetic plunger 12. At this time, since the electromagnetic plunger 12 is energized by the closing switch, the plunger link 10 is fixed, and the guide member 5 provided thereon is also fixed. At the same time, the plunger link 10 presses the self-holding switch SW2 with its pressing piece 10b.

Traction operation of driven member...FIGS. 5 and 8 When the intermittent gear 31 meshing with the drive gear 30 rotates, the power plate 38 is pressed by the cam 37 and moves downward in the figure. Then, the driving member 3 interlocked with this moves upward in the figure in an arcuate trajectory centering on the support shaft 1, and as a result, the driven member 4 moves between the driving member 3 and the stepped portion 4a. Because they are in mesh with each other, they are pulled by the drive member 3 and move. At this time, the driven member 4 moves while being supported by the guide member 5, but since the sliding contact portion 4c with the guide member 5 is formed in an arc shape, the driven member 4 also moves in an arc shape. It will draw a trajectory. As a result, the step portion 4a also draws an arcuate locus protruding toward the guide member side symmetrically with the locus of the drive member 3, and the step portion 4a
The drive member 3 does not move within a.

Due to such movement of the driven member 4, the pulling plate 2
1 moves and is pulled by this pulling plate 21 to operate the loading mechanism or the head pressure bonding mechanism. For example, the head crimping mechanism is
1 rotates the head link 17 in the counterclockwise direction, and the press pin 19 provided thereon advances to the position where the head is pressed against the tape. and,
The head link 17 is held in the head forward position by its locking pin 18 engaging the step 16a of the holding plate 15. Since the holding plate 15 is interlocked with the plunger link 10, it holds the head link 17 as long as the electromagnetic plunger continues to be energized.

Stopped state of driven member...FIG. 6 When the intermittent gear rotates once and separates from the drive gear 30, the power plate 38 stops at a position where its cam follower 39 is approximately at the center of the linear return portion of the cam 37. At this time, the stopper 34 returns to its original position and the closing switch SW1 is turned off, but the electromagnetic plunger 12 is kept in an energized state by the self-holding switch SW2, and the plunger link 10 and its guide member 5 are still in the fixed position. For that reason,
When the drive member 3 interlocking with the power plate 38 stops at a position slightly further back than the front end of its stroke (same position as before inserting the cassette), the drive member 3 does not come off from the stepped portion 4a. , the driven member 4 and the pulling plate interlocked therewith are in a position where they are pulled slightly upward in the figure.

Released state of driven member...Figure 3 When the power supply to the electromagnetic plunger 12 is stopped by an electromagnetic off switch (not shown) installed in series with the self-holding switch SW2, the plunger link 10 is free to be simply pulled by the spring 14. state. Here, a spring 4d having a stronger force than this spring 14 is attached to the driven member 4.
is provided, the driven member 4 moves toward the front side while pressing the plunger link 10 in a direction away from the electromagnetic plunger 12. At this time, since the guide member 5 escapes together with the free plunger link 10, the driving member 3 is removed from the stepped portion 4a, and the lock between the driven member 4 and the driving member 3 is released.

At the same time, the holding plate 15 that interlocks with the plunger link 10 is also moved by being pressed by the driven member 4, and the step 16a of the holding plate 15 disengages from the lock pin 18 of the head link 17, and the head link 17 is pulled by a spring (not shown). and rotate clockwise. As a result, the head pressing pin 19 moves,
The head is retracted to a position away from the tape.

Also, due to the rotation of the plunger link 10, the switch pressing piece 10b is pressed against the self-holding switch SW.
2 and turns it off, even after the electromagnetic off switch is no longer pressed and turned on, the electromagnetic plunger 12 will not be energized, and the tape player will continue to operate until the next pressing operation of the power on switch SW1. remains stopped.

(3) Effects of Embodiment As described above, according to this embodiment, the driven member follows the driving member, which draws an arcuate trajectory, along a similar arcuate trajectory, so that the driven member follows the same arcuate trajectory. Large movements within the stepped portion of the member are eliminated.
Therefore, it is possible to reduce the width of the stepped portion, contributing to miniaturization of the tape player, and the sliding resistance between the stepped portion and the driving member is reduced, resulting in smooth transmission of driving force. As a result, without necessarily using a roller-shaped drive member,
A simple protruding member can be used without applying unnecessary load to the motor or other drive source, and the configuration can be simplified.

Further, a guide member 5 supporting the driven member 4
is provided on the plunger link 10 which is fixed by the electromagnetic plunger 12, so that the driven member 4 and the driving member 3 can be unlocked by simply turning the electromagnetic plunger 12 on and off.

Furthermore, the stop position of the driving member 3 is changed to the driven member 4.
By making it slightly closer to the tip than the stepped portion 4a,
When the electromagnetic plunger is de-energized, the driving member 3 connects to the plunger link 10 via the driven member 4.
Even if the plunger link 10 is constantly pulled toward the electromagnetic plunger 12 by the spring 14, the plunger link 1
0 and the electromagnetic plunger 12 can now be separated. As a result, the suction operation is performed by the spring 14, and only the suction is performed by the electromagnetic plunger 12, so there is no need to use a large-capacity suction type electromagnetic plunger 12, and the effect is that a small-capacity one exclusively for suction can be used. There is.

[Other Embodiments] The present invention can be used in general driving force transmission mechanisms in other devices besides the drive system of a tape player.

Further, the shape of the guide member is not limited to the illustrated embodiment. For example, in the case where the driven member and the driving member are always engaged, the guide member 5
will be fixed to the frame or elsewhere. Further, the start (stop) position of the driving member may be such that the driven member enters the stepped portion when it is closest to the user. That is, in the illustrated embodiment, the stopping position of the driving member is selected in order to separate the plunger link from the electromagnetic plunger, but if the driven member and the driving member are constantly engaged, such consideration is unnecessary. It is.

Although the illustrated embodiment uses a power plate that operates intermittently as a driving source, the present invention can also be applied to systems in which a link provided with a driving member is continuously moved and a driven member is constantly reciprocated. . Furthermore,
The returning operation of the driven member uses a spring that acts in the opposite direction to the driving member, but it is also possible to provide a pair of front and rear step portions on the driven member so that the driving member can press the driven member even when returning.

[Effects of the Invention] As described above, the present invention has a simple structure in which the sliding part formed on the driven member and the guide member is formed into an arc shape that projects toward the guide member side in symmetry with the locus of the driving member. However, by making the width of the stepped portion provided on the driven member narrower, the driven member can be made smaller, and the sliding resistance between the driven member and the driving member can be reduced.

[Brief explanation of drawings]

1 and 2 are plan views showing an example of a conventional driving force transmission device, and FIGS. 3 to 6 are plan views showing an embodiment in which the lock mechanism of the present invention is utilized in a tape player. The figure shows before locking starts, Fig. 4 shows when locking starts, Fig. 5 shows when the driven member is being pulled, and Fig. 6 shows when the driven member is being pulled.
The figure shows the driven member at rest. Figures 7 and 8
The figures are plan views showing an example of a drive mechanism that moves a drive member, with FIG. 7 showing the stopped state and FIG. 8 showing the operating state. SW1...Power on switch, SW2...Self-holding switch, 1...Spindle, 2...Link, 3...
...Engaging member, 4...Driven member, 4a...Step part,
4c...Circular sliding contact portion, 5...Guide member, 10
... Plunger link, 12 ... Electromagnetic plunger, 13 ... Adsorption piece, 14 ... Spring, 15
...Holding plate, 17...Head link, 21
... Pull plate, 30 ... Drive gear, 31 ... Intermittent gear, 34 ... Stopper, 37 ... Cam, 38
...Power plate, 41...Drive plate.

Claims (1)

[Claims] 1. A drive member that reciprocates in an arcuate trajectory, and a driven member that is provided with a step that engages with the drive member, and a drive member that is opposite to the drive member with the driven member in between. A drive characterized in that a guide member is provided on the side of the driven member in sliding contact with the driven member, and the sliding contact portion of the driven member with the guide member is formed into an arc shape projecting toward the guide member side in symmetry with the locus of the driving member. Locking mechanism of force transmission device. 2. A locking mechanism for a driving force transmission device according to claim 1, wherein the guide member is provided on a plunger link that is attracted and fixed by an electromagnetic plunger. 3 The driven member is biased by a spring in the opposite direction to the pulling direction of the driving member, the driving member reciprocates intermittently, and the stopping position is off the step of the driven member. 3. The locking mechanism for a driving force transmission device according to claim 2, wherein the plunger link is pressed in a direction to separate from the electromagnetic plunger.