JPS606025B2 - switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device that automatically switches electronic devices, etc., using soft touch operations.

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, with portable tape recorders, etc.
Due to limitations in power supply capacity, it is difficult to actually employ the plunger drive method. In view of the above points, the present invention provides a switching device capable of soft-touch operation that can easily and reliably perform automatic switching operations even with a small-capacity power supply.

Embodiments of the 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. Further, a pinion 6 that rotates integrally with the side plate 2 is attached to the outside of the side plate 2, and is connected to the reel drive motor. In addition, this pinion 6
may be coupled to a capstan shaft or other motor shaft.
A shaft 7 is attached to the center between the side plates 2 and 3. In this koji 7, toothless gears 8 are rotatably arranged in parallel so as to correspond to the respective pinions 5. As shown in FIGS. 2 and 3, this toothless gear 8 consists of a toothed portion 8a and a toothed portion 8b. This toothless gear is provided with a lubricating cam piece 9 on the right side and a circular magnet 10 on the left side. This cam piece 9 has a small diameter portion ga
It consists of a straight line part 9b and a circular arc part 9c continuous thereto. The magnet 10 has an S pole and an N pole attached in the diametrical direction including the toothless portion 8b of the toothless gear 8. Reference numeral 11 denotes a shaft installed between the side plates 2 and 3, and arms 12 facing the cam piece 9 are rotatably arranged in parallel to the shaft 11.

Reference numeral 13 denotes an elastic plate attached to the lower surface of the bottom plate la 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 rotation of the toothless gear 8. Reference numerals 15 and 16 denote upright pieces formed by standing up the negative part of the bottom plate la at a position opposite to the magnet 1, 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 playback or rewinding of the tape recorder, and is constantly biased by a spring 21', for example, to the right in FIG. Can be locked in position. Next, the operation of the above switch device will be explained.

Before the switch bag layer operates, it is in the state shown in FIGS. 1 to 3. When the tape recorder is in the operation mode, the pinion 6 is constantly rotating.
Pinion 5 is also rotating. At this time, since the spring piece 14 is always pressing the arm, the arm i
2 is brought into contact with the linear portion 9b of the cam 9 to maintain a large contact resistance and restrict the counterclockwise rotation of the partially toothed gear 8 as shown in FIG. Upright piece 16 ``The auxiliary member 17 is the iron core, and the bottom plate la,
A magnetic circuit is formed using the upright piece 16 as a closed magnetic path. The toothless gear 8 is stable in a state in which the bias is 4 mm greater than the holding force of the arm 12 against the cam 9.Here, for example, when the regeneration operation plow is pressed, a current momentarily flows through the coil 19. The end of the bent portion 17a constituting the iron core is magnetized to the north pole, and the end of the upstanding piece 15 is magnetized to the south pole.

In this case, the magnetic force of the S pole of the upright piece 15 is weak because the bottom plate lb forming a long magnetic path is long. Therefore, the above bent portion ITa
The N pole at the end and the N pole of the magnet 10 repel each other, and due to the repulsive force, the magnet 1 begins to rotate in the direction of the repulsion meter in Figure 2. By the rotation of the magnet 10,
The teeth 8a of the toothless gear 8 mesh with the pinion 5 as shown in FIG. Note that when the range of the toothless portion 8b is large, the S pole of the magnet 10 is attracted to the N pole of the iron core following the repulsion between the N poles, so the toothless gear 8 is The gear rotates in the same manner, and the teeth 8a are reliably engaged with the pinion 5. 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 coil 19 is not energized and the toothless gear 8 is not operating. That is, until the tooth portion 8a meshes with the pinion 5, the arm 12 is in contact with the light portion ga of the cam 9 as shown in the center diagram, so at least the operation starts from a stop. The rotation of the toothless gear 8 up to this point is relatively easy even when the magnetic force, that is, the current flowing through the coil 19 is small.
The required rotational torque obtained by the excitation of 9 is small. In this way, the toothless gear 8 meshed with the pinion 5 is forcibly rotated as shown in FIG. to perform operations such as playback on a tape recorder, etc. Also, 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.
In addition, the bottom plate la, the upright pieces 15 and 16, and the auxiliary member 17
If it is integrally formed with a magnetic material, it will have both coil mounting and shielding functions, which will be advantageous in terms of work and cost. The pinion for the drive source can be easily engaged with the toothed part of the toothless gear, and the working mode is activated by retracting the arm and automatically operated lever by the toothless gear.
The mode can be switched reliably and arbitrarily.

Therefore, as a power source for performing such an operation, a battery or the like that can slightly energize the electromagnet can be used, making it possible to realize soft-touch switch buttons in small handheld tape recorders and the like.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a switching device according to the present invention, FIGS. 2 and 3 are a right side sectional view and a left side sectional view of FIG. FIG. 6 is a right side sectional view showing the state before and after the operation. 5... Pinion, 8... Missing tooth gear, 9... Cam, 10...
...Magnet, 12... Arm, 14... Spring, 17, 18, 19... Electromagnet. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A partially toothed gear, a magnet and a cam provided on the side surface of the partially partially toothed gear, a pinion for a drive source provided at a position facing the partially partially toothed gear, and one side of the cam receives the action of a spring. and an electromagnet that faces the magnet and repulses the magnet by passing an electric current, and the repulsion action causes the teeth of the partially toothed gear to mesh with the pinion at least until A switching device characterized in that the outer diameter of the cam that contacts the arm is made equal in the section.