JPH081722B2 - Rotation speed control device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a speed control device with a switch for performing a switching operation while suppressing the rotational movement of an input member to a constant speed.

[Conventional technology]

For example, a soft eject device is provided in a cassette tape recorder, a cassette video tape recorder, or the like. This soft eject device has a built-in speed control mechanism inside, and by controlling the speed of the mechanical moving member to a constant speed, the operation of ejecting the cassette or vice versa can be performed smoothly, and mechanical I try to soften the shock of such movements. For example, the official gazette of Japanese Utility Model Laid-Open No. 57-193439 shows an example.

By the way, when such a speed control mechanism operates, in some applications, for example, in the soft eject device described above, the recording / recording mode, the reproduction mode, etc. are canceled, and the corresponding circuit on / off operation and the recording / reproduction head are performed. A switching operation of the switch is required to switch the operating actuator on and off.

[Object of the Invention]

Therefore, it is an object of the present invention to incorporate a switch inside such a mechanical speed control mechanism so that the switch can be automatically switched in cooperation with the speed control mechanism.

[Structure of Invention]

Therefore, in the present invention, the rotational force of the input member to be speed-controlled is increased by the speed increasing train wheel, and the speed-increasing rotation causes the speed adjusting member to rotate at a high speed. This speed control member applies a braking force to the rotational force of the input member by generating a centrifugal force or an eddy current at the time of high speed rotation, and keeps the speed within a certain range. Therefore, the rotation of the input member is performed at an almost constant speed from the initial rotation to the end thereof after the transient rising rotation.

On the other hand, the speed-up gear train has a switch cam formed by any one of the gears as a member for switching the switch, and the switch cam is supported at the initial rotation of the input member or at the time of entering the constant speed operation range. By switching the switches, the required switching operation is obtained in relation to the speed control operation.

This switch can also be forced off by an external reset button. At this time,
The reset button, together with the reset lever, sets the rotation angle of the switch cam to a predetermined angle, thereby setting the switching operation during the subsequent speed control operation to a predetermined time. In this way, during speed control operation,
In synchronism with the start, the switching operation is simultaneously performed. Such a reset operation can be performed independently of the rotation of the speed control train wheel.

In addition, when a rotational force in the opposite direction is applied to the input member, the rotational force is interrupted by a one-way clutch, etc. provided in the middle of the speed increasing train, and transmitted to the switch or the final stage of the speed increasing train. Not done. Therefore, malfunction can be reliably prevented.

Generally, as a constant speed device, a motor is used as a drive source,
There is a technique of detecting the speed of a motor with a rotary encoder and producing a constant speed by feedback control.However, compared to such a conventional device, the rotation speed control device of the present invention has a special drive source and rotation speed. Since it can be realized by a mechanical mechanism without requiring the detecting means etc., it can be provided as a small and inexpensive device.

〔Example〕

1 to 3 show a rotation speed control device 1 of the present invention.
Is shown. The rotation speed control device 1 is a space formed inside the case 2 on the main body side and the case 3 on the lid side, and gears 4, 5, 6, 7, 8 as a speed increasing train wheel, a worm 9, a speed adjusting member. 10, a switch switching member 11, a switch 12, a reset lever 13 and a reset bonder 14 are housed.

The gear 4 is fixed to the end of the input member 15 as a rotation speed control target (speed control target) in a non-rotating state, and meshes with the small teeth of the composite gear 5. The gear 4 enters inside through the openings of the cases 2 and 3 and constitutes a part of the speed-up gear train.

Further, the gears 5 and 6 are both of the composite type, and the case 2 and
It is rotatably fitted in a shaft 16 fixed between the two. Then, the ratchet pawl formed integrally with the gear 5
17 and a ratchet 18 formed on the inner peripheral surface of the gear 6
Engage with each other to constitute one-way rotation transmitting means for transmitting only one direction, that is, counterclockwise rotation in FIG.

Further, the gear 6 is a compound type gear 7 with large teeth.
Of the compound type gear 8 meshes with the large tooth of the compound type gear 8, and the gear 8 meshes with the worm 7 at the large tooth portion. The gears 7 and 8 are rotatably supported by shafts 19 and 20 which are similarly fixed between the cases 2 and 3. The shafts 16, 19, 20 may be integrally formed with the cases 2, 3.

Also, the worm 9 is an axis by itself,
It is rotatably supported between a bearing portion 21 of the case 2 and a bearing portion 23 of a cup 22 fitted in the case 2.

Further, the worm 9 integrally holds the speed adjusting member 10 inside the cup 22 by the pressing plate 24 fixed by press fitting and the stop ring 25. As shown in FIG. 4, the speed control member 10 of this embodiment is formed in a substantially S-shape by a flexible member such as rubber, and is deformed by a centrifugal force in a direction to increase its outer diameter. As a result, the cup 22 comes into contact with the inner peripheral surface of the cup 22, and the braking force is generated by the frictional force at that time.

On the other hand, the gear 6 meshes with the switch gear 26 supported by the shaft 19 at its small tooth portion. The switch gear 26 transmits a rotational force to the switch switching member 11 supported coaxially by a one-way clutch spring 28. Then, this switch switching member 11
For example, four cam projections 27 are formed on the outer circumference at equal intervals and correspond to the switch 12.

The switch 12 includes a pair of movable contact plates 30 and a fixed contact plate 31. One of the movable contact plates 30 is made of a spring material and, as shown in FIG. 5, is engaged with a notch 32a of a contact receiver 32 fixed to the case 2 by a locking piece 30a at one end of the curved portion. The locking piece 30b at the other end is fitted in the receiving groove 33 of the case 2 and further has a reinforcing bead formed by an extension of a part thereof.
30c faces the stepped portion of the reset button 14. The movable contact plate 30 performs a so-called click movement with a straight line connecting the contact receiver 32 and the receiving groove 33 as an unstable region and an on position or an off position as a stable region. The other fixed contact plate 31 corresponds to the movable contact plate 30 and the contact 34, and is fixed to the case 2 by means such as fitting.

Further, the reset lever 13 has a support shaft 35 inside thereof.
It is rotatably supported by, and is fitted in the elongated hole 14a of the reset button 14 by the projection 13a at the substantially central portion thereof, and further, faces the angular shaft portion 29 by the claw 14b at its tip. The side surface of the angular shaft portion 29 is a concave surface corresponding to the arc-shaped movement locus of the claw 14b. Further, the reset button 14 is slidably housed inside the case 2 in a state of being biased by a spring 36 and a part of which is projected to the outside. The elongated hole 14a is formed obliquely with respect to the sliding direction of the reset button 14. In addition, the reset lever 13 and the reset button 14 described above.
Represents a resetting means, and is held by an intermediate plate 37 fixed to the case 2 so as not to interfere with the gear 6 and the like.

Next, the operation of the rotation speed control device 1 will be described with reference to FIG.

First, when the reset button 14 is pushed against the elasticity of the spring 36 in the direction of pushing it into the cases 2 and 3, the return piece 30c moves from the position shown by the imaginary line in FIG. 3 to the direction shown by the solid line. Switch 12 is set to the off state. At this time, the curved portion of the movable contact plate 30 is displaced to the rotation range of the cam protrusion 27. At the same time, the reset lever
13 rotates in the clockwise direction around the support shaft 35, and its claw 14
By b, it hits the angular shaft portion 29 of the switch switching member 11 and regulates it to a predetermined rotation angle. The rotation of the switch switching member 11 at this time is due to the one-way clutch spring.
It is not transmitted to the switch gear 26 due to the interposition of 28. In this way, the reset operation of the switch 12 is completed.

After that, when the input member 15 rotates, the rotation is transmitted as a high rotational speed to the speed adjusting member 10 via the speed increasing train wheel, that is, the gears 4, 5, 6, 7, 8 and the worm 9. At this time, the speed control member 10 is subjected to centrifugal force during rotation,
A frictional braking force is generated between the outer periphery and the inner peripheral surface of the cup 22, and the rotation of the input member 15 to be speed-controlled is suppressed to a constant rotation speed.

At the same time, the rotational force of the input member 15 is transmitted through the gear 6, the switch gear 26, and the one-way clutch spring 28,
It is transmitted to the switch switching member 11 as a counterclockwise rotation in FIG. While the switch switching member 11 is rotating, the cam projection 27 hits the curved portion of the movable contact plate 30 and presses it toward the fixed contact plate 31. Therefore, the contact 34 comes into contact with the movable contact plate 30, and as a result, the switch 12 is set to the ON state.
Even after the switch 12 is turned on, the switch switching member 11 continues to rotate without contacting the movable contact plate 30.

Here, when the switch 12 is turned on, the input member 15
It is set at the beginning of the rotation of, or a period after which it is suppressed to a constant speed. Such a setting can be appropriately set by changing the number of cam projections 27, the rotation angle of the switch cam 27 at the time of resetting, the gear ratio, or the like.

In addition, when a rotational force in the opposite direction is applied to the input member 15,
Since the ratchet pawl 17 does not mesh with the ratchet 18 and moves while sliding, the reverse rotation of the input member 15 is only transmitted to the gears 4 and 5, and the subsequent gears 6 and 7,
Not transmitted to 8.

[Other Examples]

The speed control member 10 of the above embodiment is a centrifugal force system, and utilizes the frictional braking force of a flexible material, but this speed control means is an eddy current system using a magnet and a disk-shaped conductor, Alternatively, other braking means may be used. In addition, switch 12 is
It is not limited to the contact plate type as shown in the figure, but may be a micro switch, a photoelectric switch or the like.

Further, in the above embodiment, the ratchet pawl 17 and the ratchet 18 are interposed as one-way clutch means in the middle of the speed increasing train, but such a clutch function is provided, for example, in the input member 15 itself, in the reverse rotation direction. A means to prevent
Alternatively, it may be omitted if the speed control member 10 can be rotated in any direction without providing such means, for example, if it is the eddy current speed control means as described above.

〔The invention's effect〕

 In the present invention, the following unique effects are obtained.

In the process in which the rotation is transmitted from the input member of the rotation speed control target to the worm through the speed increasing train wheel, the unidirectional rotation transmission means is interposed, so that only the rotation of the input member in one direction is the target of the rotation speed control. Since the other rotation is not the control target, the rotation of the input member due to the other rotation can be driven without a load torque, and the switch switching member is interlocked with the rotation of the input member in one direction. Is operated, whereby the switch is automatically switched, so that the speed control function and the switching function are simultaneously obtained in a synchronized state, and the switched switch and the switching member after rotational displacement are forced by the reset means. Since it can be restored to its original state, it can be switched when a return action such as a switch is necessary regardless of the rotation action of the input member. And, specific effects can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the rotation speed control device of the present invention seen from a plane, FIG. 2 is a vertical cross-sectional view thereof, FIG. 3 is a cross-sectional view seen from the back surface, and FIG. 4 is a plan view of a speed control member. FIG. 5 is a side view of the switch portion, FIG. 6 is a partial sectional view showing the relationship between the reset lever and the reset button, and FIG. 7 is a time chart diagram during operation. 1 ... Rotation speed control device 2, 3 ... Case, 4, 5,
6, 7, 8 ... Gears as a speed increasing train, 9 ... Worm, 10 ... Speed adjusting member, 11 ... Switch switching member, 12
...... Switch, 13 …… Reset lever, 14 …… Reset button, 15 …… Input member, 17 …… Ratchet claw, 18 ……
Ratchet, 26 …… Switch gear, 27 …… Cam projection, 30
...... Movable contact plate, 31 …… Fixed contact plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Nagatsura 1006, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References: 57-193439 1150 (JP, U) Actual development Sho 58-105093 (JP, U)

Claims (1)

[Claims] 1. A worm housed in a case, a speed increasing train wheel for transmitting rotation to the worm, and a one-way rotation transmitting means provided on the speed increasing train for transmitting only one direction of rotation to the worm. , An input member for controlling the rotational speed that drives the speed increasing wheel train, a speed adjusting member that rotates integrally with the worm, or a speed increasing wheel train that is closer to the worm than the one-way rotation transmitting means. And a switch switching member that is interlocked with the rotation in one direction by the one-way rotation transmitting means, a switch that is switched by the switch switching member, and a reset means that forcibly returns the switch and the switch switching member. A rotation speed control device for the input member.