JPH073081Y2 - Rotating body stop structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] In a mechanism having a rotating body such as a gear installed so as to rotate one rotation or more, one side of the rotating body is locked so that the rotating body is locked at a predetermined rotation position. The spiral groove is provided on the and the locking member provided with the protrusion that engages with the spiral groove is placed so as to overlap the rotating body.

[Industrial application field]

 The present invention relates to a stopping structure for a rotating body such as a gear.

[Conventional technology]

Rotating bodies such as gears are used as means for transmitting motion in various mechanisms. For example, when the power of a drive source is transmitted to actuate a target constituent member, it is often the case that the constituent member is caused to perform a predetermined operation using a gear train formed of gears having different shapes and numbers of teeth. At this time, when it is necessary to limit the operating range, operating time, etc. of the constituent members, as one means, stoppers are provided on the gears of the gear train to stop the rotational movement of the gears. For example, this stopper is formed by providing a protrusion on the side surface of the gear and bringing the protrusion into contact with another stationary member. However, the stopper having such a structure limits the rotational movement of the gear to an operation within one rotation as long as the gear rotates at a fixed position. In other words, this stopper could not be provided on a gear that rotates more than once. Therefore, when a stopper is provided, the gear train is configured such that there is a gear that does not rotate more than one rotation between the start point and the end point of the operation of the target component member, and the stopper is provided on the gear. Was there.

[Problems to be solved by the device]

In order to provide a gear that does not rotate more than one rotation in the gear train according to the operating range of the component to be operated, it is necessary to increase or decrease the number of gears or adjust the reduction ratio by increasing or decreasing the gears. Priority is given to one. Increasing the number of gears or the number of teeth increases the manufacturing cost and the size of the mechanism. On the contrary, if the number of gears is reduced, it is impossible to obtain a predetermined torque or rotation speed. In order to construct a compact and high-performance mechanism, a gear train structure that prioritizes size and performance by eliminating the conventional method of restricting the rotation of the gears in the gear train is required.

An object of the present invention is to provide a rotating body stop structure that can lock a rotating body such as a gear at a predetermined rotation position even when it is rotated one rotation or more, and can be manufactured inexpensively without taking up a space. Is.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the stop structure for a rotating body provided by the present invention has the following configuration.

FIG. 1 and FIG. 2 are views showing the principle structure of a rotating body stop structure according to the present invention. In this figure, the rotating member 1 and the locking member 2 are placed on the support body 3 in an overlapping manner. Here, the locking member 2 is installed so as to be reciprocally movable in the diametrical direction through the center of the rotating member 1. Rotating member 1
A spiral groove 5 having a predetermined length (center angle 2π + 2α in the figure) of one turn or more around the rotation axis 4 is provided on one surface of the. The groove 5 is provided with a substantially uniform depth, and therefore, both ends are provided with end faces in the extension direction. The locking member 2 has a protrusion 6 that engages with the groove 5. Since the locking member 2 is movable as described above, when the rotating member 1 is rotated in either the left or right direction, the projection 6 is formed in the groove 5 along with the movement of the locking member 2.
It is designed to slide inside.

[Action]

When the rotary member 1 rotates in the direction of arrow a in FIG. 1, the projection 6 slides in the groove 5 and the locking member 2 moves in the direction of arrow b as described above. When the rotation member 1 rotates to a position where the projection 6 contacts the end surface of the groove 5, the rotation member 1 is locked in that position by the locking member 2 via the projection 6 (see FIG. 3a). From the position shown in FIG.
When rotation starts in the direction, the projection 6 slides in the groove 5 in the direction opposite to the above while the locking member 2 moves in the direction of arrow d. When the rotary member 1 rotates more than one rotation and the projection 6 comes into contact with the other end surface of the groove 5, the rotary member 1 is locked by the locking member 2 at that position (see FIG. 3b).

〔Example〕

Fig. 4a is a side view showing an embodiment of the present invention,
An example of application to a cartridge insertion / ejection mechanism in a DAT (digital audio tape) deck or the like is shown. First
FIG. 4b is a plan view showing FIG. 4a from below.

The cartridge insertion / ejection mechanism in the deck mechanism is, roughly speaking, a support portion 12 that always supports the cartridge 10,
A drive unit 14 for moving the cartridge 10 between the insertion completion position and the ejection position for reproducing the cartridge 10 via the support unit 12, and a drive unit in response to a signal from a switch unit (for example, 16) interlocking with the drive unit 14. Control means for controlling the operation of 14 (not shown)
And a mechanism for automatically inserting and ejecting the cartridge in cooperation with each other.

In this embodiment, the drive unit of the cartridge insertion / ejection mechanism
14 is a side plate 15a inside the deck, as shown in FIG. 4b.
It is provided between the outer side plate 15b and the motor 18, which is a drive source, and a gear train which is composed of several gears and transmits the drive force from the drive source. The gear train includes an intermediate gear 20, a gear 22 with a stopper, and a soot ridge drive gear 24. Here, the motor 18, the intermediate gear 20, and the gear 22 with a stopper are attached to the outer side plate 15b of the deck, while the cartridge drive gear is attached to the inner side plate 15a. The gear 22 with a stopper is provided with the rotating body stopping structure according to the present invention shown in FIG. 1 as described below.

According to FIG. 4a, the gear 22 with a stopper is composed of a gear member 221 and a locking plate 222 arranged so as to overlap with the gear member 221. The gear member 221 has a spiral groove 22 centered on the rotary shaft 224 on one surface.
Equipped with 5. The spiral groove 225 has a substantially uniform depth and has end faces in the extension direction at both ends. Further, on the other surface of the gear member 221, a smaller diameter gear 228 having a cam surface 227 on a part thereof is integrally formed with the shaft shared. The locking plate 222 has a rectangular shape and has two elongated holes 229 extending in the longitudinal direction arranged in series. The rotary shaft 224 of the gear member 221 penetrates through one of the two elongated holes 229, and the support pin 230 penetrates through the other elongated hole. Both the rotary shaft 224 and the support pin 230 are fixed to the side plate 15b outside the deck. Therefore, the locking plate 222 is
It can reciprocate in the diametrical direction through the center of the gear member 221. Between the two elongated holes of the locking plate 222, the gear member 2
A projection 226 that engages with the spiral groove 225 is provided on the surface facing the 21. The protrusion 226 slides in the spiral groove 225 as the gear member 221 rotates, and the locking plate 222 moves in the vertical direction in the figure with it. With the above configuration, the stopper-equipped gear 22 is securely locked at the position where the protrusion 226 rotates until it comes into contact with either end surface of the spiral groove 225.

The cartridge drive gear 24 includes an arm 26 and a gear portion 28 having a cam surface 27 on the outer circumference, and the gear portion 28 engages with the coaxial cam gear 228 of the gear 22 with a stopper to transmit rotation. The arm 26 has a holding hole 26a, and a guide shaft 30 connected to the cartridge support portion 12 extends through the side plate 15a inside the deck and is movably held in the holding hole 26a. The side plate 15a on the inside of the deck is provided with an elongated guide hole 32 that defines the moving direction of the guide shaft 30, and the guide hole 32 is used as the guide shaft.
30 penetrates. The positions of the cartridge support portion 12 when the guide shaft 30 reaches each end of the guide hole 32 are the insertion completion position and the ejection position of the cartridge, respectively, and the rotation of the cartridge drive gear 24 moves the cartridge between the positions. To do.

The cartridge driving gear 24 must stop the rotational movement, that is, the movement of the cartridge supporting portion 12, at the insertion completion position and the ejection position of the cartridge. This action is performed, in part, by the guide shaft 30 contacting each end of the guide hole 32 to lock the movement of the guide shaft 30. At this time, it is necessary to simultaneously stop the driving force of the motor 18 in order to prevent the gears from being damaged or idling. Therefore, the rotating body structure according to the present invention is used as the gear 22 with a stopper.

Here, the gear with stopper 22 and the cartridge drive gear 24
The operation from the cartridge ejection position to the insertion completion position will be described with reference to FIGS. 5a to 5c. Figures 5a to 5c
In the drawing, for the sake of understanding, only the cam gear 228 which is coaxial with the stopper gear 22 is shown.

FIG. 5a shows the states of the cam gear 228 and the cartridge drive gear 24 at the cartridge ejection position. In this position both gears are out of mesh and the cam faces 227 and 2
7 abut each other. The guide shaft 30 held by the arm portion 26 of the cartridge drive gear 24 is in contact with the left end of the guide hole 32 provided in the side plate 15a of the deck shown in FIG. No more rotation in the direction. At this time, in the gear 22 with a stopper, the projection 226 of the locking plate 222 abuts on the end surface of the groove 225 of the gear member 221 to stop the rotational movement.

When the cartridge is inserted into the deck, a switch (not shown) is actuated to start the motor 18, which causes the gear 22 with a stopper, that is, the cam gear 228 to rotate in the direction of arrow B in FIG. 5b. Then, the contact between the cam surfaces 227 and 27 is released, and the gear of the cam gear 228 engages with the gear portion 28. Further cam gear 2
When 28 continues to rotate, the cartridge drive gear 24 rotates in the direction of arrow C in FIG. 5b accordingly, and the guide shaft 30 moves in the direction of arrow D in FIG. 5b along the guide hole 32.

When the gear further rotates, the guide shaft 30 comes into contact with the other end portion (not shown) of the guide hole 32. This position is the cartridge insertion completion position.
Shown in Figure 5c. Even in this position, both gears are disengaged from each other and the cam surfaces are in contact with each other. Since the guide shaft 30 is in contact with the end portion of the guide hole 32, the cartridge drive gear 24 cannot rotate in the arrow C direction any more.
At this time, the stopper-equipped gear 22 is also locked by the action of the groove 225 and the protrusion 226 and cannot rotate in the arrow B direction. When the inserted cartridge is ejected, the motor 18 rotates in reverse and the
From the state shown in the figure, each gear rotates in the opposite direction (arrow h) to move to the state shown in Figure 5a.

In the state shown in FIGS. 5a and 5c, the operation of the motor 18 is stopped by the action of the control means (not shown) as described below. At this time, as described above, since the gears of the stopper-equipped gear 22 and the cartridge drive gear 24 are disengaged from each other and the cam surfaces are in contact with each other, the reverse rotation of the gears is prevented.

The rotation shaft 34 of the cartridge drive gear 24 penetrates the side plate 15a inside the deck, extends across the deck, and further penetrates the side plate 15c on the opposite side. On the outside of the side plate 15c, the rotary shaft 34
A cartridge drive plate 36 having a shape similar to the cartridge drive gear 24 is fixed to the tip of the. Cartridge drive plate 36
Moves the cartridge support portion 12 and the cartridge in conjunction with the cartridge drive gear 24, and when the support portion 12 reaches the insertion position and the discharge position of the cartridge, operates the switch portion 16 to send a signal to a control means (not shown). Acts to send. Based on the signal sent from the switch unit 16, the control means such as the microcomputer is controlled by the motor 18 of the drive unit 14.
Stop the operation of.

From the above, the gear with stopper 22 in the present embodiment
Indicates that the above control means does not operate accurately and the trouble prevention function in the case where the motor 18 does not stop is also waited.

[Effect of device]

In the rotating body stopping structure according to the present invention, the rotating member and the locking member are arranged so as to overlap each other, and the spiral groove is provided on one surface of the rotating member, and the protrusion engaging with the spiral groove is provided on the locking member. Since the stop member is configured to be capable of reciprocating in the diametrical direction through the center of the rotating member, the rotational movement of the rotating member is locked by the action of the projection that abuts the end surface of the spiral groove. The rotating member can be locked at a predetermined rotation position even when the rotating member rotates one or more times. As a result, a gear train that can transmit a predetermined motion can be configured without adding gears, and manufacturing is easy. Therefore, it is effective in downsizing the mechanism and reducing manufacturing cost.

[Brief description of drawings]

FIG. 1 is a view showing a principle structure of a rotating body stop structure according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and 3a.
FIGS. 3 and 3b are views for explaining the operation of the rotating body stopping structure of FIG. 1, FIG. 4a is a side view showing an embodiment of the present invention, and FIG. 4b is an embodiment of FIG. 4a from the bottom side. Shown in plan view, FIGS. 5a-5c
The figure illustrates the operation of the gear train in the embodiment of FIG. 4a. 1 ... Rotating member, 2 ... Locking member, 5 ... Groove, 6 ... Projection, 18 ... Motor, 22 ... Gear with stopper, 221 ...
Gear member, 222 ... Locking plate, 225 ... Spiral groove, 226 ... Protrusion, 24 ... Cartridge drive gear, 26 ... Arm part, 30
…… Guide axis.

Claims (1)

[Scope of utility model registration request] 1. A disk-shaped rotating member, and a locking member arranged at a position overlapping with the rotating member and reciprocally movable in the diametrical direction through the center of the rotating member. A spiral groove having a predetermined length of one turn or more about the rotation axis is provided on one surface of the rotating member, and the engaging member engages with the groove and the rotating member rotates inside the groove. A locking projection that slides on the rotary member is provided, and the rotary member is locked by contacting the end surface of the groove at a predetermined position where the rotary member has made one rotation or more. Stop structure for rotating body.