JPS604286Y2 - switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device that automatically performs a switching operation of an electronic device using a soft touch operation, and particularly relates to a switching device that can perform the switching operation without malfunction.

2. Description of the Related Art Conventionally, various types of soft-touch operation switches for tape recorders and the like have been provided.

However, since all of these use a plunger as a driving source, they require a large-capacity power source, and have drawbacks such as an increased size and increased cost.

Furthermore, portable type tape recorders, etc.
Due to limitations in power supply capacity, it is difficult to actually employ the plunger drive method.

The present invention provides a soft-touch operable switching device that can easily and reliably perform automatic switching operations even with a small capacity power supply. This provides a new technology that prevents this.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a switch device in a tape recorder that switches between a plurality of operations.

In the figure, reference numeral 1 denotes a machine frame, and a plurality of (seven) pinions 5 integral with a shaft 4 are attached to the upper portions of both side plates 2 and 3.

A pinion 6 is attached to the outside of the side plate 2 and rotates integrally with the side plate 2, and is connected to the shaft of the reel driving motor.

Note that this pinion 6 may be coupled to a capstan shaft or another motor shaft.

A shaft 7 is attached to the center between the two side plates 2.3.

On this shaft 7, gears 8 with partially missing teeth are rotatably arranged in parallel so as to correspond to the pinions 5 described above.

As shown in FIGS. 2 and 3, the partially toothed gear 8 is composed of a toothed portion 8a and a partially toothed portion 8b.

This partially toothed gear is provided with a lubricating cam piece 9 on its right side and a circular magnet 10 on its left side.

This cam piece 9 consists of a small diameter portion 9a, a straight portion 9b, and an arcuate portion 9c continuous thereto.

The magnet 10 has an S pole and an N pole magnetized in the diametrical direction including the toothless portion 8b of the toothless gear 8.

11 is a shaft installed between the above-mentioned side plates 2 and 3, and this shaft 1
Arms 12 facing the cam pieces 9 are rotatably arranged in parallel to each other.

Reference numeral 13 denotes an elastic plate attached to the lower surface of the bottom plate 1a of the machine frame 1, and a plurality of spring pieces 14 are formed on the upper part of the elastic plate.

Each of these spring pieces 14 constantly presses each of the cam pieces 9 to urge or prevent the partially toothed gear 8 from rotating.

Reference numerals 15 and 16 indicate upright pieces formed by standing up a part of the bottom plate 1a at a position facing the magnet 10, and the upright piece 15 is extended so as to approach the periphery of the magnet 10.

An auxiliary member 17 having a bent portion 17a is stacked on the upright piece 16, and a bobbin 18 having a coil 19 wound thereon is attached.

The end of the bent portion 17a extends around the magnet 10.

Current is supplied to this coil 19 by each switch operation such as playback or rewinding.

Reference numeral 20 designates an operating lever or a lever associated therewith for instructing the tape recorder to play, rewind, etc. It is constantly biased by a spring 21, for example, to the right in FIG. can be locked to.

Next, the operation of the above switch device will be explained.

Before the switch device operates, it is in the state shown in FIGS. 1 to 3, and when the tape recorder is in the operation mode,
The pinion 6 is constantly rotating.

Therefore, the pinion 5 is also rotating. At this time, since the spring piece 14 is constantly pressing the arm 12, the arm 12 comes into contact with the straight part 9b of the cam 9, and maintains a large contact resistance, so that the missing tooth is removed as shown in FIG. The counterclockwise rotation of gear 8 is restricted.

On the other hand, the magnet 10 forms a magnetic circuit with the upright piece 16 and the auxiliary member 17 as the iron core, and the bottom plate 1a and the upright piece 15 as a closed magnetic circuit. Magnetization is performed by slightly biasing the magnet in the clockwise direction.

This slight bias is smaller than the holding force of the arm 12 against the cam 9.

In this state, the partially toothed gear 8 is stable.

Here, for example, when a regeneration operation button is pressed, a current momentarily flows through the coil 19, and the end of the bent portion 17a constituting the iron core is magnetized to the north pole, and the end of the upright piece 15 is magnetized to the south pole.

In this case, the magnetic force of the S pole of the upright piece [5 is weak because the bottom plate 1b forming a long magnetic path is long.

Therefore, the N pole at the end of the bent portion 17a and the N pole of the magnet 10
The poles repel each other, and the repulsive force causes the magnet 10 to
begins to rotate counterclockwise in Figure 2.

As the magnet 10 rotates, the teeth 8a of the partially toothed gear 8 mesh with the pinion 5 as shown in FIG.

Note that if the range of the missing tooth portion 8b is large, the N
Following the repulsion between the poles, the S pole of the magnet 10 is attracted to the N pole of the iron core, so the partially toothed gear 8 rotates in the same manner as described above, ensuring that the teeth 8a mesh with the pinion 5. It will be held on.

In this case, since the force of the spring 14 is relatively small, the cam 9 is lightly held by the arm 12.

Then, the above-mentioned coil 19 is not energized, and the partially toothed gear 8
When the arm 12 is not in operation, that is, until the tooth portion 8a meshes with the pinion 5, the arm 12 is in contact with the same diameter portion 9a of the cam 9 as shown in FIG. The rotation of the partially toothed gear 8 at least from the stop to the start of operation is caused by a relatively small magnetic force, that is, the coil 19.
It is easily performed even if the current applied to it is small.

In other words, the required rotational torque obtained by excitation of the coil 19 can be small.

Thus, the partially toothed gear 8 meshed with the pinion 5 is in the fifth position.
As shown in the figure, the lever 20 is forcibly rotated, and during one rotation, the arm 12 pulls the lever 20 against the spring 21 and pulls it back again to perform operations such as playback on a tape recorder or the like.

Further, when it rotates once, the tooth portion 8a separates from the pinion 5, returns to the state shown in FIGS. 2 and 3, and stops at the stable position described above.

By the way, when the pinion 5 approaches the toothless portion 8b of the toothless gear 8 from the state shown in FIG. 5, the cam 9 is in an unstable position.

At this time, as shown in FIG.
2 is pressed against the pinion 5 with a relatively large force under the force of the spring 21, and receives inertia due to the pressing force, so that in the section where the toothless portion 8b extends to the pinion 5,
The partially toothed gear 8 rotates freely, and its teeth 8a are immediately engaged with the pinion 5 again.

Therefore, this malfunction may be repeated continuously, causing an overrun of the automatic switching operation.

In other words, when the cam 9 rapidly shifts from the top dead center to the bottom dead center, the toothless gear 8 receives large rotational inertia, and the toothless portion 8b
speeds up the rotation in the section where the pinion 5 reaches the tooth 8 again.
a meshes with pinion 5.

In order to solve this problem, in the present invention, a viscoelastic oil having a braking effect is interposed between the shaft 11 of the arm and the member supporting it.

As a result, when the cam 9 moves from the top dead center to the bottom dead center, the rotation of the arm 12 by the spring piece 14 becomes slow, and the rotation of the partially toothed gear 8 is braked.

Therefore, by such braking, the partially toothed gear 8 is reliably stopped at the position where the arm 12 contacts the linear portion 9b of the cam 9, and waits at the correct position for the next operation.

As described above, according to the present invention, by bringing an arm whose rotational support part is coated with a damping agent into contact with the cam of the partially toothed gear of the automatic switching mechanism operated by a soft touch operation, this arm is activated. The rotational biasing of the partially toothed gear is performed slowly, thereby ensuring the stability of the automatic switching operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a switching device according to the present invention, FIGS. 2 and 3 are a right sectional view and a left sectional view of FIG.
6 through 6 are right side sectional views showing the state before and after the operation of the partially toothed gear. 5... Pinion, 8... Missing tooth gear, 9
...Cam, 10...Magnet, 12
...Arm, 14...Spring piece,
17,18.19... Electromagnet.

Claims (1)

[Scope of utility model registration request] A partially toothed gear, a magnet and a cam provided on the side of the partially toothed gear, a pinion for a drive source provided at a position facing the partially toothed gear, and abuts against the cam under the action of a spring. and an electromagnet that faces the magnet and repulses the magnet by passing an electric current therethrough, and a braking agent is applied to the shaft portion of the arm to dampen the bias against the cam. A switching device characterized by: