JPS6316119Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holding structure for a disc cam of a motor timer that controls the operation of electrical appliances and the like.

2. Description of the Related Art Recently, in order to make it easier to use household electrical appliances such as electric rice cookers, room air conditioners, electric fans, etc., motor timers have been widely used to time-control household appliances.

In general, this type of motor timer uses a synchronous motor as a driving source to rotate a disc cam at a constant speed via a reduction gear train, and this disc cam directly opens and closes a switch means such as a leaf switch. be. By the way, this motor timer is equipped with two sets of switches, for example, in order to perform multi-stage time-limited control of connected devices using this device, or to perform time-limited control of two connected devices using one device. be. In order to smoothly open and close each switch and prevent damage to the contacts, the disc cam installed in this device is divided into an upper part and a lower part, and is configured so that they can mutually perform quick movements. has been done.

On the other hand, in the manufacture of motor timers, it is desired to reduce manufacturing costs by making components compatible with those with one set of switches and those with two sets of switches.

However, in conventional disc cams, the upper and lower disc cams are not held independently;
Therefore, if it is for one circuit and only requires the upper disc cam, it is necessary to provide some sort of spacer to support the upper disc cam, or to install a disc cam that has an integral spacer part. be. Therefore, there is a problem in that the disc cams cannot be made interchangeable, which leads to problems such as an increase in manufacturing costs.

This idea was created with these points in mind.
The motor timer can be made interchangeable with the disc cam by having an extremely simple structure in which the lower edge of the shaft hole of the upper disc cam is supported by the case and a space is provided below the upper disc cam. A disc cam holding structure is provided. The configuration and the like will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a plan view showing a motor timer equipped with a disc cam holding structure according to the present invention, with its case cut away, and FIG. 2 is a sectional view showing one embodiment of the disc cam holding structure. 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. 3
A drive gear 3 is disposed facing inside the case 1, and the drive gear 3 is mounted on the rotating shaft of a synchronous motor (not shown) fixed on the lower surface of the case 1.

Reference numeral 4 denotes a reduction gear train that decelerates and transmits the rotation of the first stage synchronous motor, the first stage gear 4a of which meshes with the drive gear 3, and the final stage gear 4b that engages with the disc cam 5.
It meshes with the cam drive gear 6 that drives the cam drive gear 6. The cam drive gear 6 is fixed on a cam setting shaft 7 that is rotatably supported by a bearing 1a integrally provided in the case 1 and a through hole 2a bored in the lid 2. . A leaf switch 8 has a plurality of contact points 8a, 8a, and is controlled to be opened or closed by the disc cam 5 that engages with the leaf switch.

To explain this disc cam 5 in more detail, the disc cam 5 is rotatably supported by the cam drive gear 6 facing into its shaft hole and the bearing part 1a of the case 1, and It is divided into a plate cam 5a and a lower disc cam 5b. Further, an elongated hole 9 is bored in the circumferential direction, and an engaging protrusion 6a formed integrally with the cam drive gear 6 and protruding in the axial direction is engaged in the elongated hole 9. And this engagement protrusion 6a
The disc cam 5 is driven by this and controls the leaf switch 8 which is in contact with the cam surface on the circumference. On the other hand, when opening and closing the switch, the leaf switch 8
The engagement force between the elongated hole 9 of the disc cam 5 and the engagement protrusion 6
a slides instantaneously, that is, the disc cam 5 rotates and performs a quick operation, and the switch is smoothly opened and closed.

Reference numeral 10 denotes a lower end peripheral edge of the shaft hole of the upper disc cam 5a, and this lower end peripheral edge 10 is a stepped surface 1 provided on the outer periphery of the bearing portion 1a, which is the upper surface of the bottom plate of the case 1.
It is supported by 1. This step surface 11 is
A space is provided below the upper disc cam 5a in which the lower disc cam 5b is rotatably supported. Further, the upper peripheral edge of the shaft hole of the upper disc cam 5a is in contact with the step surface 6b of the cam drive gear 6.

Reference numeral 12 denotes a projection protruding in the radial direction from the circumferential surface of the disc cam, and reference numeral 13 represents a stopper that comes into contact with the projection 12 to restrict rotation of the disc cam 5.

FIG. 3 is a cross-sectional view showing another embodiment, and in this figure, members that are equivalent or the same as those shown in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted. Reference numeral 14 denotes the lower edge of the shaft hole of the upper disc cam 5a, which is supported by the base edge of the bearing portion 1a, which is the upper surface of the bottom plate of the case 1. This lower end peripheral edge 14 is
It protrudes downward in the axial direction so that a space for housing the lower disc cam 5b is formed below the upper disc cam 5a. Further, a cam drive gear 6 is disposed above, similar to the embodiment shown in FIG.

In the disk cam holding structure configured in this manner, the upper disk cam 5a is supported in the downward direction by the upper surface of the bottom plate of the case 1, and is regulated in the upward direction by the cam drive gear 6. . That is, the upper disc cam 5a is not held integrally with the lower disc cam 5b as in the conventional case, but is supported independently and with the lower disc cam 5b rotatably supported on the lower side. It is rotatably held with a space provided for storage.

Therefore, as a timer for one circuit, only the upper disc cam 5a is arranged, and as a timer for two circuits, the lower disc cam 5b is placed in the space below this upper disc cam 5a.
All you have to do is set up the . That is, the upper disc cam 5a can be made compatible as a component for one circuit and one for two circuits.

Further, in this motor timer, the control time of the connected equipment is set by rotating the cam setting shaft 7 clockwise. In FIG. 1, the protrusion 12 protruding from the disk cam 5 is close to the stopper 13 for locking the protrusion 12, that is, the protrusion 12 is set for the longest time. And a disc cam 5 that keeps the leaf switch 8 in a closed state at the time of setting.
is gradually rotated by the synchronous motor in the counterclockwise direction shown by the arrow via the reduction gear train 4, and when the leaf switch 8 returns to the initial position, the leaf switch 8
The leaf switch 8 becomes open.

In the above embodiment, a disc cam for two circuits in which an upper disc cam and a lower disc cam are disposed is explained, but a disc cam for one circuit is not equipped with a lower disc cam. Needless to say, it is sufficient to dispose only the upper disk cam without the need for the upper disk cam.

As explained above, according to the present invention, the lower end edge of the upper disc cam is supported by the case so as to provide a space below the lower end edge to accommodate the lower disc cam. The disk cam can be held independently.

Therefore, this upper disc cam can also be used as a component of a one-circuit or two-circuit timer. That is, there is an effect that the parts can be made compatible, and since the number of parts can be reduced, there is also an effect that the manufacturing cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a motor timer equipped with a disc cam holding structure according to the present invention, with its case cut away; FIG. 2 is a sectional view showing an embodiment of the disc cam holding structure; and FIG. The figure is a sectional view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Case, 5... Disc cam, 5a... Upper disc cam, 6... Cam drive gear, 8... Leaf switch, 10, 14... Lower end periphery.

Claims (1)

[Scope of utility model registration request] In a motor timer that includes a case, a cam drive gear disposed inside the case, and a disc cam that is driven by the cam drive gear to open and close a switch, the lower edge of the shaft hole of the upper disc cam is A disc cam holding structure for a motor timer, characterized in that the disc cam is supported on the upper surface of a case bottom plate, and a space is provided below the upper disc cam in which a lower disc cam is housed.