JPH01128251A - Gear rotating and stopping mechanism - Google Patents

Abstract

PURPOSE:To instantly and easily stop or rotate a gear on the operating side without using an intermittent gear and to contrive the miniaturization of a device by meshing a changeover gear provided on a turning member with a driving gear at the same time that a cam gear becomes released from its lock. CONSTITUTION:The cam gear 2 having a cam 3 formed with two grooves 3a is meshed with a connecting gear 4. Then, the turning member 5 having the changeover gear 7 is pivotally supported by a pivot 5a and energized toward the cam gear 2 side by a spring 6, and usually the gear 2 is locked by engaging an engaging protrusion 5b with a groove 3a. Now, when a solenoid 8 is excited, the turning member 5 is moved to the right to release the lock, so that the changeover gear 7 is simultaneously meshed with the driving gear 1 to allow the cam gear 2 to rotate instantly. Thus, the gear 2 on the operating side can instantly and easily be rotated and stopped without using an intermittent gear, while the device concerned can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gear rotation/stop mechanism used as a driving force transmission mechanism of, for example, a tape player.

(Conventional technology) The number of devices mounted on vehicles is increasing and becoming more diverse due to recent technological developments. The available mounting space is severely limited.

On the other hand, in tape players and the like, a mechanism formed by meshing a plurality of gears is used as a driving force transmission mechanism for transmitting driving force from a driving source to an operating member. In order to rotate and stop such a gear mechanism, it is sufficient to turn on and off the drive motor, etc. in the drive source, but in normal equipment, one drive motor can simultaneously rotate multiple Do not operate the drive motor because the
A mechanism is required to rotate and stop the gears on the connected side while the gears are being connected.

Conventionally, such a mechanism for rotating and stopping a gear has been constructed by meshing a gear on the driving side with an intermittent gear on the operating side. When the operation is completed, the intermittent part of the intermittent gear on the operating side is opposed to the gear on the driving side, and the gear V on the operating side is stopped by externally meshing both gears. .

However, in a gear rotation/stop mechanism using such an intermittent gear, the intermittent portion becomes play and cannot be used as an operating stroke, so there is a problem that the intermittent gear becomes larger due to the intermittent portion. Furthermore, in order to engage the intermittent gear with the drive-side gear from a position where the intermittent portions are opposed to each other, it is necessary to perform a so-called pull-in operation in which the intermittent gear is slightly rotated by some means. Here, in order to perform the priming operation, a means for biasing the intermittent gear in the priming direction is required. Furthermore, in order to reliably pull in, either the intermittent gear or the drive-side gear that meshes with the intermittent gear must be made thicker, which also poses the problem of expanding the installation space. In addition, when a cam is provided on an intermittent gear to drive an operating member, there is a problem that the cam becomes unnecessarily large due to the intermittent portion.

(Problems to be solved by the invention) The present invention was proposed to solve the problems of the prior art as described above, and its purpose is to improve the rotation of gears without using intermittent gears. - To provide an excellent gear rotation/stop mechanism that can stop the gear, is compact and simple on the R side, and can reduce the installation space.

[Structure of the Invention] <Means for Solving the Problems> The gear rotation/stop mechanism according to the present invention uses a cam gear having a cam with a groove as the operating gear, and
A rotating member is provided that slides on the outer circumference of the cam of the cam gear and has an engaging protrusion that falls into the groove of the cam and locks the cam gear, and a switching gear is rotatably attached to this rotating member and engaged. When the protrusion is on the outer periphery of the cam, the switching gear engages with both the drive gear and cam gear, and when the engagement protrusion falls into the groove of the cam, the switching gear engages with either one of the drive gear or cam gear. The feature is that it is configured to disengage from the mesh.

(Function) In the present invention having the above configuration, by rotating the rotating member, the gears can be changed, that is, the cam gear, which is the operating gear, can be immediately switched between rotating and stopping. can. In this way, in the present invention, since no intermittent gear is used, the entire circumference of the cam gear can be used as an operating stroke, eliminating waste in the configuration. That is, the gear can be made smaller by not providing an intermittent portion, and since there is no pull-in, there is no need for a means for biasing the intermittent gear in the draw-in direction, and there is also the advantage that the gear can be made thinner.

(Embodiment) An embodiment of the gear-V rotation/stop mechanism according to the present invention as described above will be specifically described with reference to the drawings.

*Configuration of Example* In FIG. 1, reference numeral 1 denotes a constantly rotating drive gear connected to a drive motor (not shown). A cam gear 2 is provided as a gear on the operating side of the drive gear 1, and a cam 3 having grooves 3a at two locations is provided on one side of the cam gear 2. A connecting gear 4 is arranged on the drive gear 1 side of the cam gear 2 so as to mesh with the cam gear 2 at all times.

A rotating member 5 is provided between the drive gear 1 and the cam gear 2 and is rotated by a screw 5a.
The spring 6 biases the cam gear 2 toward the cam gear 2, and the engagement protrusion 5b, which is usually provided at the tip of the engagement protrusion 5b, slides on the outer periphery of the cam 3 of the cam gear 2.
When it reaches the groove 3a, it falls into the groove 38 and the cam gear 2
is designed to be locked.

In addition, a switching gear 7 that meshes with both the drive gear 1 and the connecting gear 4 and connects both gears is rotatably attached to the rotating part (15). Part 5
When the engaging protrusion 5b is on the outer circumference of the cam 3, that is, when the rotating part
When A5 rotates to the side in the figure, it meshes with both the drive gear t1 and the connecting gear 4, and when it falls into the engagement protrusion 5b of the rotating part 11715 or the groove 3a of the cam 3. , that is, the rotating part vJ
When gear 5 rotates to the left in the figure, it is disengaged from drive gear 1.

Further, in this embodiment, a solenoid 8 is used as a means for rotating the rotating member 5 in the unlocking direction. That is, when the cam gear 2 starts to be driven after being locked, the solenoid 8 is energized to attract the solenoid attraction portion 5C of the rotating member 5, and the rotating member 5 is moved in the unlocking direction on the right side of the figure against the spring 6. It is designed to be retained.

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

First, as shown in FIG. 1, when the engaging protrusion 5b of the rotating member 5 is in contact with the outer periphery of the cam 3 of the cam gear 2, the rotating portion 4Δ5 is located on the right side in the figure, and the switching gear 7 is Since it meshes with both the drive gear 1 and the connection gear 4, the rotation of the drive gear 1 is transmitted to the cam gear 2 via the connection gear 4, and the cam gear 2 rotates. When the cam gear 2 rotates, the engagement protrusion 5b of the rotating member 5 slides on the outer periphery of the cam 3.

When the engagement projection 5b of the rotating member 5 reaches the groove 38 of the cam 3, the urging force of the spring 6 causes the engagement projection 5b to reach the groove 38 of the cam 3.
b falls into N3a. That is, the rotating member 5 instantaneously rotates to the left in the figure as shown in FIG. The transmission of driving force is cut off. Here, an inertia force is generated in the cam gear 2, but since it is locked by the rotating part (5th part), there is no problem of it rotating unnecessarily.

In addition, when rotating the cam gear 2 again from the state shown in FIG. 2, the solenoid 8 is energized as shown in FIG. All you have to do is mesh the gear 7 with the drive gear A71. In this case, as a result of the cam gear 2 rotating slightly, the engagement protrusion 5b of the rotating member 5 rides on the outer periphery of the cam 3, and the cam gear 2 is unlocked. can be rotated.

As described above, in this embodiment, the rotation and stopping operations of the gear can be switched instantaneously without using an intermittent gear. Therefore, compared to the conventional technology that uses an intermittent gear, the intermittent part (pugia) can be reduced, and there is no need for a pull-in stage, and there is no need to make the gear thicker.

As a result, it can significantly contribute to the miniaturization and simplification of equipment.

By the way, the gear mechanism of this embodiment can be specifically used in a program change mechanism as shown in FIG. 4, for example.

In FIG. 4, reference numeral 12 is a change gear using the cam gear 2 of this embodiment, which has grooves 13a at two places on the cam 13, and an engagement roller 12a at one end. The matching roller 12a changes from change play 1 to
14 of the engagement holes 14a. With this engagement configuration, the change play 1 to 14 is connected to the change gear 12.
It moves from the left operating position to the right operating position or from the right operating position to the left operating position every half rotation, and
At each operating position on the left side or stone side, the engine gear 1
2 is locked, it is indirectly locked.

Here, the change plays 1 to 14 are members that restrict the position of one side of the binder roller plays 1 to 15 and switch between the forward and reverse pinch rollers 16F and 16R. Furthermore, the pinch roller plays 1 to 15 are rotatably attached to a head plate (not shown) by a shaft 15a, and when the head plate moves forward, the corresponding pinch rollers 16F, 16R are pressed by the pressing parts 15F, 15R of the left stone. Press and capstan @1
7F.

This is a member that is crimped onto 17R.

When the change plate 14 is in the left operating position as shown in FIG.
4r, the engagement roller 15r on the opposite side of the pinch roller plates 1 to 15 is regulated backward, and the pinch roller plate 15
The pinch roller 16 on the opposite side is
The engaging protrusion 16b of R is regulated backward, the pinch roller 16R on the opposite side is regulated in a position away from the capstan shaft 17R, and the pinch roller spring 18 is pressed by the pressing portion 15F on the positive side of the pinch roller plate 15. The pinch roller 16F on the positive side can be pressed onto the capstan shaft 17F via the pinch roller 16F. Conversely, when the change plate 14 is in the right operating position, the positive side engagement roller 15f of the pinch roller plate 15 is regulated backward by the positive side position regulating portion 14f, and the positive side engagement roller 15f of the pinch roller plate 15 is Engagement protrusion 1 of the positive side pinch roller 16F at the side position regulating part 15G
6C is regulated rearward, and the pinch roller 16F on the positive side is regulated in a position away from the capstan shaft 17F, and the pinch roller 16F on the opposite side is regulated at a position away from the capstan shaft 17F, and the pinch roller 16F is regulated on the opposite side via the pinch roller spring 18 at the pressing portion 15R on the opposite side of the pinch roller plate 15. It can be pressed onto the pinch roller 16R or the capstan shaft 17R. In addition, 168 in FIG. 4 indicates the forward and reverse pinch rollers 16F, 1.
This is the axis of 6R.

*Other Embodiments* The present invention is not limited to the above-mentioned embodiments; for example, the shape of the rotating member and the arrangement of the gears can be selected as appropriate. Also, means for positioning the rotating member on the cam gear side,
The means for positioning the rotating member on the unlocking side is not limited to a spring or a solenoid, and can be freely changed.

Further, the mechanism to which the present invention is specifically applied is not limited to a program change mechanism, but can be widely applied to various power transmission mechanisms using gears.

[Effects of the Invention] As explained above, in the present invention, the rotation of the cam gear, which is the gear on the operating side, is controlled by a simple configuration using a cam gear, a rotating member, and a switching gear, without using an intermittent gear.・It is possible to provide an excellent gear rotation/stop mechanism that allows instantaneous and easy switching of stops, reduces the installation space, and contributes to the miniaturization and simplification of equipment.

[Brief explanation of the drawing]

1 to 3 are plan views showing one embodiment of the gear rotation/stop mechanism according to the present invention.
The figure shows the stopped state, and FIG. 3 shows the unlocked state. FIG. 4 is a plan view showing a specific example in which the same embodiment is applied to a program change mechanism. 1... Drive gear, 2... Cam gear, 3... Cam,
3a...Groove, 4...Connection gear, 5...Rotating member,
5a... Shaft, 5b... Engaging protrusion, 6... Spring, 7... Switching gear, 8... Solenoid. 12... Change gear, 12a... Engagement roller, 1
3...Cam, 13a...Groove, 14...Change play 1-14a...Engagement hole, 14f, 14. r...
Position regulating part, 15... pinch roller plate, 15a
...shaft, 15F, 15R...pressing part, 15f, 15
r-...Engagement roller, 15b, 15c...Position regulating portion, 16F, 16R...Pinch roller, 16a...Shaft, 16b, 16c...Engagement protrusion, 17F, 17R...
・Capstan shaft, 18...pinch roller spring.

Claims (5)

[Claims] (1) a. Drive gear that constantly rotates. b. Cam gear with a cam with grooves. c. Rotating member rotatably provided. d. An engaging protrusion provided on the rotating member that slides on the outer periphery of the cam of the cam gear and falls into the groove of the cam to lock the cam gear. e. When it is rotatably attached to the rotating member and the engagement protrusion is on the outer periphery of the cam, it meshes with both the drive gear and the cam gear, and when the engagement protrusion falls into the groove of the cam, it engages with both the drive gear and the cam gear. A switching gear that disengages one of the gears and the cam gear. A gear rotation/stop mechanism having each of the above configuration requirements. (2) Claim 1, in which a cam gear that meshes with the switching gear via a connecting gear that constantly meshes is used as the cam gear.
The gear rotation/stop mechanism described in section. (3) The gear rotation/stop mechanism according to claim 1, wherein the cam gear is used as a change gear that switches the pinch roller between forward and reverse directions. (4) The rotating member includes a spring that urges the peripheral member in the direction of contact with the cam, and a lock release means that rotates the member in the unlocking direction against the spring when the cam gear starts driving from the time of locking. A gear rotation/stop mechanism according to claim 1. (5) The gear rotation/stop mechanism according to claim 4, which uses a solenoid as the lock release means.