JPS633074Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a motorized time switch, and more particularly to a one-way clutch mechanism of the time switch.

As is well known, this type of time switch consists of a time limit setting mechanism that can arbitrarily set a time limit by external operation, a rotary cam that rotates by an angle corresponding to the time limit setting position of this time limit setting mechanism, and this rotary cam. and an output gear that is mounted coaxially with the motor to receive the rotational output of the motor that is decelerated by the reduction gear mechanism, and the rotational output of this output gear is transmitted to the rotational cam and the time limit setting via a one-way clutch mechanism. A switch lever interlocked with the rotary cam opens and closes the contacts and returns the time limit setting mechanism to its initial position.

The one-way clutch mechanism includes a main gear that meshes with the rack of the time limit setting mechanism, a leaf spring that presses the main gear against the output gear to bring them into surface contact, and a leaf spring that is interposed between the leaf spring and the main gear. The plate spring slides on the friction plate during a time limit setting operation, allowing only the main gear to rotate together with the time limit setting mechanism, and during time counting, the plate spring presses the main gear against the output gear. The rotational output of the output gear is transmitted to the main gear by frictional force, thereby returning the time setting mechanism to its initial position.

However, the one-way clutch mechanism used in this type of time switch requires only a small operating force when setting a time limit, and must be configured so that the rotational output of the motor is accurately transmitted to the main gear when counting time. However, as is well known, it is difficult to uniformly obtain this performance by adjusting the pressing force of the leaf spring that presses the friction plate. In addition, due to the influence of the surface precision of the main gear and output gear, unevenness tends to occur in the slipping torque between the main gear and the output gear, and this is added to the operating force, so there is a natural limit to reducing the operating force. . In order to reduce the unevenness of the sliding torque, it is necessary to widen the friction surface, which impedes miniaturization of the device. Furthermore, this clutch mechanism has many problems and is complicated, making assembly difficult.

This idea was made in view of the problems of the conventional technology, and its purpose is to create a one-way clutch mechanism that is easy to assemble and has a simple configuration, and that can uniformly transmit the rotation of the motor to the time setting mechanism. By doing so, it is an object of the present invention to provide an easy-to-operate time switch that requires little operating force.

Hereinafter, embodiments of this invention will be described in detail based on the accompanying drawings.

FIG. 1 is an exploded perspective view of the time switch of this invention, which consists of a synchronous motor 3 mounted on a base frame 1 and an idle gear 4.
, a reduction gear mechanism 5 , a frequency switching mechanism 6 , a one-way clutch mechanism 9 consisting of a pinion gear 7 and a filigree spring 8 having a mounting shaft portion 8 a bent at one end at a substantially right angle, and a slider 10 . and speed plate 1
A cover 2 is placed over the base frame 1, and a fitting claw 2a extending from the cover 2 is fitted into a fitting hole 1a of the base frame 1. This is fixed.

The motor 3 is attached from the back of the base frame 1 to a motor mounting portion 1b formed at one end of the base frame 1, and is fixed to the base frame 1 by a locking claw 1c.

The idle gear 4 is an output gear 3 attached to the rotating shaft of the motor 3, as shown in FIGS. 2 and 3.
a, and transmits the rotational output of the motor 3 as it is to the first reduction gear 5a of the reduction gear mechanism 5, and the shaft of the idle gear 4 is connected to the motor mounting portion 1b.
It is integrally formed on the top surface of.

As shown in FIG. 3, the reduction gear mechanism 5 consists of eight reduction gears between 5a and 5h installed on the base frame 1 in parallel with the motor 3, and converts the rotational output from the motor 3 into a predetermined speed. The rotational speed is reduced and the reduced rotational output is transmitted to the input gear 7' below the pinion gear 7.

The frequency switching mechanism 6 switches gears according to the power supply frequency of 60/50Hz, and as shown in FIG.
By externally switching the switching lever 6d, the gear mounting portion 6a is rotated by a predetermined angle, and as shown in FIG. Between the gears 6b, 6
(c) meshes with each other to transmit rotational output at a predetermined rotational speed.

The one-way clutch mechanism 9 includes a slider 10
It is composed mainly of a pinion gear 7 and a wirework spring 8 that mesh with a rack 10a of the pinion gear 7.
As shown in FIG. 3, is integrally attached to the upper end of a flexible pinion shaft 7a, and the reduced rotational output from the reduction gear mechanism 5 is transmitted to the input gear 7' also attached to the lower end. Rotational output is transmitted to the pinion gear 7.

The upper end of the pinion shaft 7a is connected to the cover 2.
It is movably supported in a guide hole 2b formed in the guide hole 2b, and is further pressed by a filigree spring 8, as shown in detail in FIG.

In FIG. 4, the filigree spring 8 is attached to the mounting shaft portion 8a.
is inserted into the mounting hole 30 formed on the side of the slide case 1d, its free end is locked to the upper end side of the pinion shaft 7a, and its middle part is locked to the upper end side of the pinion shaft 7a.
The spring 8 is fitted into a locking recess 31 formed on the side of the slide case 1d in a state where the spring 8 is bent so as to press and bias the slide case 1d in the engaging direction.

The pressing force of the filigree spring 8 causes the pinion gear 7 to mesh with a rack 10a formed on the side surface of the slider 10 along the sliding direction, and the rotational output from the motor 3 causes the pinion gear 7 to
Return to the initial position. Also, slider 10
When the input gear 7' is slid by external operation, the input gear 7' meshes with the reduction gear mechanism 5, and the pinion shaft 7a
cannot rotate, but since the pinion shaft 7a is made of a flexible member, when the pinion gear 7 is pushed by the moving rack 10a, the pinion gear 7 is repelled, the pinion shaft 7a is bent, and the pinion gear 7 and the rack 10a are disengaged, and the slider 10 can be freely slid. At this time, the swinging range of the pinion shaft 7a due to the contact and separation of the rack 10a and the pinion gear 7 is restricted by the guide hole 2b. Furthermore, the cutout 32 of the locking recess 31 is provided to prevent this rocking movement from being obstructed.

As shown in FIG. 1, the slider 10 has a substantially rectangular parallelepiped shape, with a lever 10b vertically protruding from the center of its upper surface, and a rack 10a formed along the sliding direction on one side. There is.

The slider 10 is slidably housed in a rectangular box-shaped slide case 1d that is integrally formed in parallel with one side of the base frame 1, and the lever 10b is inserted through a slit 2c formed in the cover 2. The slider 10 protrudes and can be slid by external operation.

One end of the slider 10 is notched in a tapered shape to form a tapered part 10c, and when setting the time limit, this taper part 10c allows the claw parts 12a and 13a of the switch levers 12 and 13 to be smoothly attached to the side surface of the slider 10. It can be guided and brought into contact.

Further, a projection 10d protruding in the form of a thin line is formed on the lower surface of the slider 10, and a linear guide groove 1e (a second
) are formed, and these allow the slider 10 to slide smoothly within the slide case 1d.

As shown in FIG. 1, the quick-moving plate 11 is a substantially rectangular plate in which a fitting hole 11a is formed which loosely fits into the protrusion 10d on the lower surface of the slider 10 with play in the sliding direction, It is installed between the slider 10 and the slide case 1d, and can freely move relative to the slider 10 by a certain distance in the sliding direction, and can move inside the slide case 1d along with the slider 10. It slides.

When setting the time limit by sliding the slider 10 by external operation, the speed-moving plate 11
is located on the right in the figure, and its tip 11b is located at a position lower than the tapered part 10c of the slider 10, and when the slider 10 returns, it is located on the left in the figure and its tip 11b is lower than the tapered part 10c of the slider 10. 11b moves together with the slider 10 so as to be aligned with the tip of the tapered portion 10c, and when the slider 10 returns to its initial position, it touches the claw portion 13a of the switch lever 13 that was in contact with the side surface of the quick-moving plate 11. By being pressed, the switch levers 12 and 13 are instantaneously moved to the right in the figure, thereby instantaneously returning the switch levers 12 and 13 to their initial positions.

As shown in FIG. 1, the switch levers 12 and 13 are rotatably supported at one end by a shaft 1f integrally formed with the base frame 1, and have claw portions 12a and 13a on their free ends. and contact operating parts 12b, 13b are formed, and the contact operating parts 12b, 13b are each formed with a contact piece 1.
7 and 19 to open and close the contacts.

The motor contact 14 and the time-limited contact 15 are arranged in parallel and one end thereof is fixed to the base frame 1, and the contact pieces 16 and 17 forming the motor contact 14 are normally open contacts, and the contact pieces forming the time-limiting contact 15 are Contact piece 18, 1 among pieces 18, 19, 20
9 is a normally open contact, and contact pieces 19 and 20 are normally closed contacts.

The claw portions 12a and 13a protrude into the slide case 1d when the contact operating portions 12b and 13b are pressed by the spring pressure of the contact pieces 17 and 19, and the slider 10
is in the initial position, the claws 12a, 13a
is in the gap formed by the tapered portion 10c, the motor contact 14 is opened to stop the time switch, and when setting the time limit, the pawl portion 12 is opened.
a, 13a come into contact with the side surfaces of the slider 10 and the speed-moving plate 11, the switch levers 12, 13 are rotated, the motor contact 14 is closed, and the time switch is operated. Further, when the slider 10 returns to its initial position, the claws 12a and 13a are suddenly dropped into the gap by the fast-moving plate 11, as will be described later, thereby instantaneously reversing the time-limiting contact 15 and the motor contact 14. It will be necessary to do so.

In the time switch configured as described above, the speed plate 11 is loosely fitted to the protrusion 10d on the lower surface of the slider 10 as shown in FIG. 5A, and the slider 10 is moved from the initial position as shown in the figure. When the fast moving plate 11 is slid in the direction of arrow A to set the time limit, the left end of the fitting hole 11a in the figure is hooked on the projection 11a, and the fast moving plate 11 moves together with the slider 10. At this time, the tip end 1 of the fast moving plate 11
1b is located at a position lower than the tapered portion 10c,
Claw portions 12a, 13a of switch levers 12, 13
is guided by the tapered portion 10c and comes into contact with the side surface of the slider 10, and rotates the switch levers 12 and 13 in the direction of arrow B to reverse the contact point and operate the time switch.

When the slider 10 is in the return operation state after setting the time limit, as shown in FIG. 5B,
The fast-moving plate 11 moves together with the slider 10 as the right end of its fitting hole 11a in the figure is hooked on the protrusion 11a. At this time, the tip 11 of the fast moving plate 11
b is located in line with the tip of the tapered portion 10c,
As the slider 10 approaches the initial position, the claw portions 12a and 13a of the switch levers 12 and 13 taper portion 10.
Even if c comes, the claw part 13a on the side of the speed-moving plate 11
Since the contacts are in contact with each other, the contacts will not return to normal.

Furthermore, when the switch lever 10 returns to the initial position, the tip end 11b of the speed-moving plate 11 reaches the claws 12a, 13a, and the speed-moving plate 11 is pressed by the pressing force thereof. As the switch levers 12 and 13 move rapidly in the direction of arrow C, the switch levers 12 and 13 momentarily return to their initial positions, and their contacts are momentarily reversed.

In this way, the fast-moving plate 11 is connected to the slider 10.
By preventing the switch levers 12, 13 from gradually returning to their rotational positions along the tapered portion 10c when returning to their initial positions, the switch levers 12, 13 are made to return to their rotational movement instantaneously. The reversing operation will also be performed instantaneously.

As explained above, in the time switch of this invention, the time limit setting mechanism is a sliding type,
Since the rotational output of the motor is transmitted to the slider constituting the slider by meshing the rack and pinion, the rotational output of the motor is reliably transmitted to the slider. The engagement between the rack and pinion is controlled by a pinion shaft made of a flexible member and a wirework spring that presses the pinion shaft, so that the engagement can be easily disengaged when operating the slider, and the operating force can be made minor. Furthermore, the structure of this one-way clutch mechanism is extremely simple as described above, and has advantages such as not only easy assembly but also the ability to miniaturize the device.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the time switch according to this invention, Fig. 2 is a plan view when the cover is removed, and Fig. 3 is a line AA and B-B in Fig. 2. 4 is a schematic enlarged view showing the clutch mechanism, and FIGS. 5A to 5C are plan views showing the operation of the speed plate. DESCRIPTION OF SYMBOLS 1... Base frame, 1d... Slide case, 2... Cover, 2b... Guide hole, 3... Synchronous motor, 5... Reduction gear mechanism, 7... Pinion gear, 7a... Pinion shaft, 8... …Filigree spring,
8a...Mounting shaft portion, 9...One-way clutch mechanism,
10...Slider, 10a...Rack, 11...
... Speed plate, 12, 13 ... Switch lever, 1
4, 15... Contact, 30... Mounting hole, 31... Locking recess.

Claims (1)

[Scope of utility model registration request] A slider is housed in a slide case so as to be reciprocally slidable and can be positioned arbitrarily by external operation, and has a rack formed along the slide direction, and a slider is provided integrally with the slider on one side of the slide case. a base frame, a cover that covers the entire upper part of the slide case and the base frame, a motor attached to the motor housing at one end of the base frame, and a cover on the base frame on the side of the motor housing. A reduction gear mechanism is provided adjacent to and in parallel with the motor to reduce the rotational output of the motor, and a pinion gear is provided on the side of the slide case and meshes with the rack of the slider. a one-way clutch mechanism that drives the pinion gear with rotational output and slides the slider back toward its initial position; and a one-way clutch mechanism that is installed between the slider and the slide case and that is constant in the sliding direction with respect to the slider. a fast-moving plate that can be freely moved relative to each other by a distance and that slides in the slide case along with the slider; and a fast-moving plate that is rotatably attached to a shaft that is erected on the base frame at the side of the slide case. , a switch lever that comes into operation when the slider comes into contact with the side surface of the slider and the speed plate when the slider is at an appropriately slid position from the initial position, and is pressed by the slider; and the other end on the base frame. The pinion gear is provided with a motor contact and a time-limiting contact that are arranged in parallel with the bottom surface of the base frame so that the longitudinal direction of the contact piece is parallel to the bottom surface of the base frame, and the pinion gear has a base end that is parallel to the bottom surface of the base frame. Swinging of a pinion shaft which is rotatably supported by the frame, whose tip is capable of tilting and swinging within a range regulated by a guide hole formed in the cover, and to which the rotational output of the reduction gear mechanism is transmitted. The pinion shaft is fixed to the end side and can be engaged with and disengaged from the rack, and the one-way clutch mechanism is configured by biasing the pinion shaft in the direction of engagement with the wire spring. A mounting shaft portion of the filigree spring, whose base end is bent approximately at right angles, is inserted into a mounting hole formed on the side of the slide case, and its free end is locked to the tip side of the pinion shaft. and the intermediate portion thereof is fitted into a locking recess formed in a side portion of the slide case with the spring bent so as to bias the pinion shaft in the meshing direction. Features a time switch.