JPH0312194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time switch in which a spring hook is attached to a gear.

[Prior art]

Conventionally, in a time switch that transmits the rotational force of the main shaft to a gear and winds up the mainspring by using a mainspring hook that rotates integrally with the gear, there is a recess 8b in the outer peripheral part 8a of the shaft of the gear 8, as shown in Figs. 9 and 10.
A groove 8c was provided to fit the spring hook 9, and an E-ring 13 was press-fitted into the main shaft 2 to prevent the gear 8 and the spring hook 9 from coming off, but since the spring hook 9 and the E-ring 13 were in contact with metal. Oiling is required, and when the mainspring hook 9 is made of synthetic resin, there is a problem in terms of strength. Furthermore, the height of the shaft outer peripheral portion 8a is approximately half the width of the spring 7 hung on the spring hanging portion 9a, and there is a possibility that the spring 7 may fall and hit the case, resulting in poor stability of the gear 8.

[Purpose of invention]

In view of the above drawbacks, the present invention proposes a time switch in which the mainspring is stably attached with an easy-to-assemble structure that allows the mainspring hook to be inserted from the axial direction on the outer circumference of the shaft of the gear, which is longer than the width of the mainspring. be.

[Structure of the idea]

The present invention is a time switch in which the rotational force of the main shaft is transmitted to a gear and the mainspring is wound up by a mainspring that rotates integrally with the gear. A groove along the axis that allows the hook to be inserted, a groove that is continuous with the groove and allows the fitted spring hook to move in the circumferential direction, and a hitch that allows the spring hook that has been moved in the circumferential direction to hit. This is because we have established a department.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. In the time switch, as shown in FIG. 1, a main shaft 2 is supported by a case 1 and a fixing member 10, and is fixed to the main shaft 2 with pins 11 protruding from both sides.A cam 3 is fitted on the outer periphery of the main shaft 2, and the cam 3 is A pin 11 is fitted into the engagement recess 3a and is rotatably engaged with the rotation of the main shaft 2. The main shaft 2 on the outside of the case 1 is provided with a stepped portion and has an elastic rotary claw plate 4, a gear 5, and a washer 12.
are fitted and prevented from coming off by caulking, and a spring hook 6 is attached to the gear 5, and the starting end of the spring 7 is hooked.

As shown in FIGS. 1 to 4, the gear 5 has a shaft outer periphery 5a that is longer than the width of the mainspring 7 protruding from the back side, and a shaft insertion hole 5b for the main shaft 2 at the center of the shaft outer periphery 5a.
is formed, and a circular groove 5c along the axial direction into which the spring hook 6 can be inserted from the axial direction and a cross groove 5d in the radial direction along the axial direction are formed on the lower side of the shaft outer peripheral part 5a, By forming a hole 5e from the front side of the gear 5 to a depth that overlaps the cross-shaped groove 5d as shown in FIGS. 2 and 5, the lower side of the hole 5e is continuous with the groove 5d, and the spring hook 6 shown in FIG. The spring hook 6 has a groove 5f that can be moved in the circumferential direction, and the side surface of the groove 5f has moved in the circumferential direction.
Thus, a protrusion 5h is formed in the groove 5f.

The spring hook 6 is a ring 6 as shown in Figure 6.
An engaging portion 6b fitted into the groove 5d in a cross shape on a
A spring hook part 6c is formed in one of the engaging parts 6b.

On the front side of the gear 5, as shown in FIGS. 2 and 5, there is a protrusion 5i that is flush with the surface that protrudes inward, a circular groove 5j, a middle part 5k on one side of the protrusion 5i, and a middle part 5k on the inside of the groove 5j. A jetty 5m is formed and the rotary claw plate 4 having elasticity is placed on the jetty 5m, and when the main shaft 2 is rotated when setting a time limit, the outer surface of the claw portion 4a in the shape of the tip of the rotary claw plate 4 touches the protrusion 5i. Then, the mainspring 7 is wound while rotating the gear 5 clockwise as shown in Fig. 5.
On the other hand, after setting the time limit to the maximum, when the main shaft 2 is reversed, the inner surface of the claw portion 4a and the side surface of the claw plate 4 contact the middle portion 5k and the protrusion 5i, respectively, at the end. has been done.

When the spring hook 6 is attached to the gear 5, it is fitted so that the cross groove 5d and the wide cross engagement portion 6b are aligned, and then when it is rotated clockwise as shown in Fig. 4, the spring hook is attached. 6 moves in the groove 5f, one end of each engaging part 6b is brought into contact with the contact part 5g, and the ring 6a is positioned on the protrusion 5h, so that the engaging part 6b is removed from the groove 5f. There is no.

When the starting end of the mainspring 7 is latched onto the mainspring hook 6 and wound around the shaft outer circumference 5a,
After the main shaft 2 is supported by the case 1 and the fixing member 10, the starting end of the mainspring 7 is inserted through a hole (not shown) in the case 1, is hooked to the mainspring hook 6c, and is wound up.

Once the time switch is configured as above,
The spring hook 6 is fitted by fitting into the groove 5d along the axial direction of the shaft outer peripheral portion 5a and moving to the groove 5f in the circumferential direction, so assembly is extremely simple. Also, when the main shaft 2 is rotated clockwise in FIG. 5 to set the time and wind the mainspring 7, the claw portion 4a of the rotating claw plate 4 hits the protrusion 5i and the gear 5 is rotated, and this rotation causes the mainspring to be wound. 6 are rotated together, and the mainspring 7 is wound around the shaft outer peripheral portion 5a. At this time, since the height of the shaft outer peripheral part 5a is made longer than the width of the mainspring 7, the mainspring 7 does not fall easily and does not touch the case 1. Further, since the spring hook 6 is fitted into the groove 5f of the shaft outer circumferential portion 5a, it does not come into direct contact with the main shaft 2 and the washer 12 fitted on the main shaft 2, so there is no need for oiling.

7 and 8 show a modification of the spring hook 6 and a corresponding modification of grooves 5c and 5d along the axial direction, and the groove 5d has a groove 5f that allows the spring hook 6 to move in the circumferential direction. is formed.

In the above explanation, the engaging portion 6b is attached to the mainspring hook 6.
Although it is provided in several locations, it may be provided in one location depending on the strength and the like. Further, the groove 5f in the circumferential direction of the gear 5 is formed into the upper hole 5e.
However, it may also be formed using a horizontal sliding core of a molding die. Further, in the above description, the axial grooves 5d are formed vertically and the circumferential grooves 5d are formed horizontally, but they may be formed as grooves that are inclined with respect to the vertical and horizontal directions.

[Effect of idea]

As mentioned above, the present invention includes a groove along the axis that allows the spring hook to be inserted from the axial direction into the outer circumference of the shaft where the spring of the gear contacts, and a groove that is continuous with the groove and allows the fitted spring hook to be inserted in the circumferential direction. Since the mainspring hook and the gear are configured to rotate together with the movable groove, it is easy to assemble the spring hook to the gear. In addition, the spring hook is fitted into a groove on the outer circumference of the shaft and does not touch the main shaft or washer, resulting in good gear stability and no need for lubrication. Furthermore, it is easier to design the outer circumference of the shaft to be longer, making it easier to prevent the mainspring from tipping over.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a cross-sectional side view of the main part of a time switch, and Fig. 2 is a gear shown in Fig. 4, with the mainspring hook and mainspring omitted.
A cross-sectional side view of the line, Figure 3 is a side view of the main part of the gear,
Figure 4 is a back view of the mainspring wound around the outer circumference of the gear shaft, Figure 5 is a plan view of the gear, Figure 6 is a plan view of the spring hook, and Figures 7 and 8 are modified examples of the spring hook. FIG. 9 is a plan view of a conventional time switch mainspring hook and shaft outer circumference, and FIG. 10 is a cross-sectional side view of the same. 2...Main shaft, 5...Gear, 5a...Shaft outer circumference,
5c... Groove along the axial direction, 5f... Groove that allows the spring hook to move in the circumferential direction, 5g... Hitting portion, 6... Spring hook, 7... Mainspring.

Claims (1)

[Scope of utility model registration request] In a time switch that transmits the rotational force of the main shaft to a gear and winds up the mainspring by means of a mainspring that rotates integrally with the gear, the mainspring can be fitted from the axial direction onto the outer periphery of the shaft where the mainspring of the gear comes into contact. A groove along the axial direction, a groove continuous to the groove and allowing the fitted spring hook to move in the circumferential direction, and a striking portion for making the spring hook moved in the circumferential direction hit. A time switch that is characterized by: