JPS6136043Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time switch, and particularly relates to an improvement of a time dial for setting the time.

In general, a late-night power time switch consists of a time dial that is rotatably attached to a final stage output shaft that is fixed to a shaft plate via a group of gears that transmit constant speed rotation of an electric motor, and is equipped with a final stage gear. It consists of a switch controlled by a single rotating cam.

By the way, it is necessary to set the time with a time switch, but with a conventional time dial, as shown in FIG. A final stage gear 23 is attached to a sleeve 22 to which a dial 27 and a time cam 26 are fixed via a disc spring 25 and a friction plate 24 using frictional force.
When setting the time, the pin 27a provided on the dial 27 must be pinched to overcome the frictional force and rotate freely relative to the gear 23. A screw 17a is formed at the tip of the final stage output shaft, and a washer 28 is formed to prevent the dial 27 from falling off.
A nut 29 is attached via.

However, in the above structure, [1]
It is difficult to maintain and manage the frictional force at a constant level.
[2] When adjusting the time, the operating force is relatively large, resulting in poor operability. [3] When adjusting the time, frictional force is applied to the gear group, which has a negative impact on the tooth profile and the connection of the gear shafts. [4] The nut was exposed in the center of the time dial, spoiling its appearance.

The object of the present invention is to provide a time dial that eliminates the above-mentioned drawbacks. Therefore, in the present invention, the final stage gear is fixed to the collar to which the dial block, which is integrally molded with the operating knob and cam of synthetic resin, etc., is loosely fitted to the inner diameter of the collar and loosely fitted to the final stage output shaft. By engaging the sleeve with a one-way clutch using a coil spring, it is completely driven by the final stage gear during operation,
When setting the time, we achieved the desired purpose by creating a time dial that can rotate freely relative to the final stage gear.

An embodiment of the present invention will be described below with reference to the drawings. 2 and 3 show an embodiment of the time dial according to the present invention, with FIG. 2 being a sectional side view and FIG. 3 being a plan view of the dial block shown in FIG. In both figures, the center hole of the sleeve 31 is rotatably fitted onto the final stage output shaft 17, and one end of the sleeve 31 is positioned at the stepped portion 17b of the final stage output shaft 17, and the final stage gear is fixed to the sleeve 31. 2
3 meshes with the pinion 12b of the gear group. A right-handed coil spring 34 constituting a one-way clutch is press-fitted into the large-diameter portion 31a of the sleeve 31 by approximately half of its total length, with its inner diameter portion being press-fitted with a desired press-fitting allowance. Narrow diameter portion 31 of sleeve 31
The inner diameter part 32a of the collar 32 is rotatably loosely fitted into b, one end of which is brought into contact with the stepped part of the sleeve 31, and the outer diameter part is press-fitted into the inner diameter part of the coil spring 34 with a desired press-fitting allowance. It is fitted. A mounting seat 33 is fixed to the other end of the collar 32, and two screw holes 33a are provided. Movement of the collar 32 in the thrust direction with respect to the sleeve 31 is regulated by a locking member 35 such as a washer fixed to the distal end of the sleeve 31 by caulking. Further, movement of the sleeve 31 in the thrust direction with respect to the final stage output shaft 17 is regulated by fitting a locking member 36 such as an E-shaped washer into a groove provided at the tip of the final stage output shaft 17.

Next, the dial block 18 has a cam surface 18a on the outer periphery, a post-shaped operation knob 38 that serves as a knob and a pointer 41 on the front, and a recessed hole 18b concentric with the outer shape of the dial block 18 on the back.
18c, 18d and a mounting hole 18e provided in the mounting step 18f, and are integrally molded from, for example, synthetic resin. Dial block 18 and color 32
The connection is made by aligning the screw hole 33a of the mounting seat 33 with the mounting hole 18e of the dial block 18 and tightening the mounting screw 37 from the front of the dial block 18. At this time, the eccentricity between the dial block 18 and the collar 32 is controlled by forming the inner diameter of the recessed hole 18b of the dial block 18 so that it fits loosely with the outer diameter of the mounting seat 33 with a small gap. In addition, the recessed hole 18d of the dial block 18
The inner diameter of the locking member, for example, the E-shaped washer 36, is formed to a dimension that reduces the gap between the outer diameter of the E-shaped washer 36 and the outer diameter of the E-shaped washer 36 so that the locking member, for example, the E-shaped washer 36, does not come off the groove at the tip of the final stage output shaft 17. It is fitted. Next, the operation knob 38 of the dial block 18 has a groove 39 so that it can be easily pinched with fingers, and a pair of side surfaces 38a of the knob, on which the fingers rest when rotating clockwise, are approximately perpendicular to the front surface of the dial block. A pair of side surfaces 38b, on which fingers rest when rotating counterclockwise, are sloped with respect to the front face of the dial block and slope upward in the counterclockwise direction. The inclination angle of this upward slope is determined as appropriate depending on the strength of the gear group, etc.

The operation of the time dial according to the embodiment of the present invention constructed as described above is as follows. When the time switch operates, the final stage gear 23 rotates clockwise around the final stage output shaft 17, and the sleeve 31 integrated therewith also rotates clockwise, so that the coil spring 34 and the large diameter of the sleeve Part 31a
Frictional force based on the press-fit acts between the coil spring 34 and the coil spring 34 to be wound tightly. Therefore, the coil spring 34 rotates clockwise together with the sleeve 31 without slipping. The rotation of the coil spring 34 is transmitted to the collar 32 by frictional force based on the press fit with the outer diameter portion of the collar 32. Therefore, the dial block 18 connected to the mounting seat 33 fixed to the collar 32 rotates together with the final stage gear 23.

Next, when setting the time, use the pair of side surfaces 38 of the operation knob 38 of the dial block 18.
Place your finger on a and rotate it clockwise. At this time, the collar 32 rotates clockwise relative to the coil spring 34, so the coil spring 34 receives the action of loosening the coil from the outer diameter part of the collar 32, and the collar 32 is rotated clockwise relative to the coil spring 34.
The friction between the outer diameter portion of No. 2 and the coil spring 34 disappears instantly. Therefore, the outer diameter portion of the collar 32 slides against the coil spring 34, and the coil spring 34 does not rotate. As a result, the dial block 18 becomes free relative to the final stage gear 23 and can be rotated easily.

When turning the dial block 18 clockwise to set the desired time, move the dial block 18 slightly ahead of the set time and then change the fingers to the pair of side surfaces 38b of the operating knob 38 to remove the backlash of the gear group. Rotate it in the opposite direction to match. On this occasion,
Since a small torque is required for reverse rotation to eliminate backlash of the gear group, it can be operated even if the knob side surface portion 38b is formed as an inclined surface. If you accidentally try to rotate the knob in the opposite direction,
A finger slips on the inclined surface of 8b and cannot be rotated in the opposite direction while applying a large torque. This prevents a large torque from being applied to the gear group, thereby preventing damage to the gear group and the fixing screw.

As detailed above, if the time dial of the present invention is applied to a time switch, the dial block will be completely driven by the final stage gear when the time switch is operating, and when setting the time, the dial block will be completely driven by the final stage gear when rotating clockwise. Since it is freed from the gear and can rotate freely, it is easy to operate, and since no torque is applied to the gear group, there is no adverse effect on the tooth profile or the connection between the gear and the shaft. Furthermore, since the dial block can be mounted without eccentricity on the mounting seat, effects such as being able to accurately mark the time can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a conventional example of a time dial, Figs. 2 and 3 show an embodiment of the time dial according to the present invention, Fig. 2 is a side sectional view, and Fig. 3 is a side sectional view. FIG. 3 is a plan view of the dial block of FIG. 2; 16...Shaft plate, 17...Final stage output shaft, 18...
...Dial block, 18a...Cam surface, 18
b, 18c, 18d... recessed hole, 18e... mounting hole, 18f... mounting step, 23... final stage gear,
31... Sleeve, 31a... Large diameter portion, 31b...
...Small diameter part, 32...Collar, 33...Mounting seat, 3
3a...Screw hole, 34...Coil spring, 35,3
6...Locking member, 38...Operation knob.

Claims (1)

[Scope of utility model registration request] a large diameter part having an outer diameter that is rotatably fitted into a center hole of a final stage output shaft fixed to a shaft plate, has a final stage gear at one end, and is press-fitted into an inner diameter part of a coil spring constituting a one-way clutch; a sleeve having a narrow diameter portion that continues from the large diameter portion with a stepped portion; the right-handed coil spring having the inner diameter portion press-fitted into the large diameter portion of the sleeve by approximately half of the total length; and the inner diameter of the coil spring. The outer diameter portion is press-fitted into the sleeve, one end is abutted against the stepped portion of the sleeve, the inner diameter portion is rotatably fitted loosely into the narrow diameter portion of the sleeve, and the other end has a mounting seat and a screw hole. a locking member provided at the tip of the final stage output shaft to restrict movement of the sleeve in the thrust direction; a locking member provided at the tip of the sleeve to restrict movement of the collar in the thrust direction; and a camera on the outer periphery. A mounting step portion having a surface and an operating knob formed on the front surface, and a mounting step portion having a recessed hole and a mounting hole on the back surface that loosely fit into the outer diameter portion of the mounting seat of the collar, and the outer surface of the locking member at the tip of the final stage output shaft. A time dial comprising a dial block having a recessed hole with an inner diameter that fits loosely into the diameter part, and the dial block is fixed to the collar by a mounting screw with the mounting step part abutting the mounting seat of the collar.