JPS6367298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor timer for controlling the operation of electrical appliances and the like.

Recently, household appliances such as room air conditioners,
BACKGROUND ART Motor timers are widely used in electric fans, electric rice cookers, and the like in order to time-control these devices and improve the convenience of use.

In general, this motor timer uses a synchronous motor as a driving source to rotate a disk cam at a constant speed via a reduction gear train, and the disk cam directly opens and closes a switch means such as a leaf switch. In addition, from a functional standpoint, this motor timer can be used for one circuit with one set of switches for timed control of one connected device, or for one circuit for timed control of two connected devices. It is classified as a two-circuit type equipped with two sets of switches in order to perform multi-stage time-limited control on one connected device.

By the way, when manufacturing a motor timer, 1.
It is necessary to make the components for circuits and those for three circuits compatible and to reduce manufacturing costs.

For this reason, in the conventional motor timer, the case is formed in advance so as to have space for storing two sets of switches, and the switches are selected and mounted using support blocks.

Therefore, as a motor timer for one circuit, there is a problem that it becomes large in size. In order to solve this problem, it would be possible to manufacture a motor timer for one circuit only, but it would be better to manufacture a motor timer for one circuit or two circuits.
Specialized parts that are not compatible with each other are required for the circuit, leading to an increase in manufacturing costs.

The present invention was made in view of these points,
A support part for supporting a lever having a cam part that engages with the disc cam and a switch actuation part that opens and closes a switch in the switchbox is provided in the case, and a through hole through which the switch actuation part freely passes is provided in the case. Due to its extremely simple configuration, it is a compact motor timer for one circuit, and by attaching only a few parts, it can be used for two circuits.
The present invention provides a motor timer that can be used for circuits. The configuration and the like will be explained in detail below with reference to embodiments shown in the drawings.

Fig. 1 is an exploded perspective view showing a motor timer according to the present invention, Fig. 2 is a bottom view of the case cut away, and Fig. 3 is a sectional view taken along the line - - of Fig. 2. Fig. 4 shows a switchbox. FIG. In these figures, the reference numeral 1 indicates a case formed of a resin material such as plastic into a substantially box shape with an opening at one end, and 2 is a lid covering the opening of the case 1. As shown in FIG.

Reference numeral 3 denotes a synchronous motor that is a driving source, and this synchronous motor 3 includes a rotating shaft 4, a rotor 5 mounted on the rotating shaft 4, a driving gear 6, and an annular coil bobbin 7.
It is composed of a stator plate 8 for holding the coil bobbin 7, a bobbin case 9, and a stator case 10 for attaching these to the case 1. And this synchronous motor 3 is case 1
The rotating shaft 4 is positioned and fixed by engaging claws 1a, 1b, .

Reference numeral 11 denotes a reduction gear train that reduces and transmits the rotation of the synchronous motor 3, the first stage gear 11a of which meshes with the drive gear 6, and the final stage gear 11b of which is a cam drive gear 13 that drives the disc cam 12. It meshes with. The cam drive gear 13 is connected to a setting shaft 14 rotatably supported by a bearing integrally provided in the case 1 and a through hole 2a bored in the lid 2.
Fixed on top. Reference numeral 15 designates a set of leaf switches that are opened and closed by the disc cam 12 that engages with the leaf switches, and are disposed within the case 1 and have a plurality of contact points 15a, 15a.

Reference numeral 16 denotes a switch box for making this motor timer for two circuits, and is formed into a substantially box shape with one side open, and a set of leaf switches 17 are housed in the inner space. The engaging protrusion 16a formed on the side surface of the switchbox 16 is coupled to the engaging hole 1c formed in the case 1, so that the switch box 16 is removably mounted on the case 1. That is, the engagement hole 1c constitutes a mounting portion for attaching the switchbox 16 to the case 1 in a detachable manner. Reference numeral 18 denotes a lever that engages with the disk cam 12 and opens and closes the leaf switch 17 in the switch box 16. Switch actuator 18b that opens and closes 17
and a fulcrum part 18c in which a shaft hole is bored, and the whole has a substantially dogleg shape.

Further, this lever 18 extends along the leaf switch 15 on the outside of the disc cam 12, and a support portion 1d integrally provided in the case 1 passes through the shaft hole of the support portion 18c so as to be freely insertable and removable. As a result, the disc cam 12 is rotatably supported in the axial direction. Switch operating part 18b at the tip
The switch box 16 is inserted through a through hole 1e formed in the case 1 in the vicinity of the disc cam 12.
It faces inside and is engaged with the leaf switch 17.

The motor timer constructed in this manner does not require the switch box 16 or the lever 18 when used for one circuit. That is, by rotating the setting shaft 14 clockwise, the control time of the connected equipment is set, and at the time of this setting, the disc cam 12 closes the leaf switch 15 that is engaged therewith. A disc cam 12 is gradually rotated by the synchronous motor 3 through the reduction gear train 11 in the counterclockwise direction shown by the arrow.
When the leaf switch 15 returns to its initial position, the leaf switch 15 engages the cam groove of the disc cam 12 and becomes open.

Moreover, if the switch box 16 and the lever 18 are removably attached and fixed to the above-mentioned one-circuit device, it can be used for two circuits. At this time, the leaf switch 15 in the case 1 is controlled as described above, but the leaf switch 17 in the switch box 16 is controlled by the lever 18. This means that the lever 18 is the support part 1d of the case 1.
This is because the switch actuating portion 18b at the tip is regulated at a predetermined position because the cam portion 18a at the approximately center is engaged with the disk cam 12. The switch operating portion 18b loosely passes through the through hole 1e formed in the case 1, and presses the leaf switch 17 in the switch box 16 to open or close it.

That is, the lever 18, which is disposed inside the case 1 and has a portion protruding outside the case 1, can control the opening and closing of another set of switches attached to the outside of the case 1.

As explained above, according to the present invention, a support part that rotatably supports a lever that engages with a disc cam is provided in the case, and the end of the lever freely passes through and protrudes outside the case. With the extremely simple structure of providing a through hole in the case, if a lever is provided inside the case so as to be freely inserted and removed, this lever can be used to control the opening and closing of a switch mounted outside the case.

Therefore, only one set of switches needs to be stored in the case, compared to a single-circuit motor timer that conventionally had storage space for two sets of switches in the case to ensure compatibility. This has the effect of making it more compact. In addition, the number of parts can be reduced because the support block that supports the switch, which was conventionally required, can be reduced, and a two-circuit motor timer can be manufactured by simply attaching only a few parts to a one-circuit motor timer. Another effect is that production costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a motor timer according to the present invention, Fig. 2 is a bottom view of the case cut away, Fig. 3 is a sectional view taken along the line - - of Fig. 2, and Fig. 4 shows a switchbox. FIG. DESCRIPTION OF SYMBOLS 1...Case, 1d...Bearing part, 1e...Through hole, 3...Synchronous motor, 11...Reduction gear train, 1
2... Disk cam, 15, 17... Leaf switch, 16... Switch box, 18... Lever, 18b... Switch operating section.

Claims (1)

[Claims] 1 A synchronous motor 3 fixed to the case 1 and a reduction gear train 11 that transmits the rotation of this synchronous motor 3
, a disc cam 12 to which the rotation reduced by this reduction gear train 11 is transmitted, and this disc cam 12
A motor timer equipped with a set of switches 15 that are opened and closed by a switch box 16 that houses another set of switches 17 in the case.
The switch 17 inside the switch box is provided with a mounting part for detachably attaching the switch 17 to the inside of the switch box by freely penetrating the through hole 1e drilled in the case 1 and facing inside the switch box.
A motor timer characterized in that a support part 1d for rotatably and detachably supporting a lever 18 having a switch operating part 18b for opening and closing and a cam part 18a for engaging the disk cam 12 is provided in the case.