JPS6262409B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a motor type time switch.

Conventionally, this type of time switch has a time limit setting mechanism that can set the time limit arbitrarily by external operation, and a recessed part formed in a part of the outer periphery of a perfect circle that rotates by an angle corresponding to the time limit setting position of the time limit setting mechanism. It has a rotary cam that moves, and an output gear that is mounted on the same axis of the rotary cam and receives the rotational output obtained by decelerating the rotational output from the motor using a reduction gear mechanism. Transmission was transmitted to the rotary cam via a one-way clutch, and the contacts were opened and closed by a switch lever linked to the rotary cam.

The contact point is configured to return when the time limit setting mechanism returns to its initial position and the protrusion of the switch lever fits into the recess of the rotary cam.

However, the above-mentioned rotating cam rotates at a very low speed, and due to the miniaturization of the time switch,
Since a small-diameter rotary cam is used, the convex part of the switch lever cannot be quickly inserted into the concave part of the rotary cam when the contact returns, and the contact returns gradually, causing arcing. They would warp and burn, shortening the life of the contacts. Furthermore, during assembly, it is necessary to adjust the initial position of the time limit setting mechanism so that the concave part of the rotary cam and the convex part of the switch lever are fitted together, which is time-consuming and requires a large number of parts, resulting in high work costs. There are problems such as high

Further, in order to improve this point, a time switch having a structure as shown in FIGS. 1a and 1b has been put into practical use.

This cam 53 has a cam 53 that can rotate freely by slidingly contacting a contact piece 52 of a motor switch 51, and has a recess 53a formed in a part of its outer periphery, and a circular arc-shaped notch is formed on the periphery of the cam 53. engaged groove 5
3b and a cam collar 54 that engages with this engagement groove 53b, and this cam collar 54
is connected to a rotating main shaft (none of which is shown) via a slip mechanism to a main gear that transmits the rotation of the motor via a reduction mechanism. The main shaft is connected to an operating knob with a memory located outside the timer case, and when this knob is manually rotated counterclockwise,
The cam collar 54 turns in the same direction and engages the engagement groove 53b.
The cam 53 is engaged with one end (shown by an imaginary line in the figure).
Rotate counterclockwise with . In this state, the protrusion 52a of the contact piece 52 contacts the outer periphery of the cam 53, bringing the contact piece 52 into contact with the motor contact 51a side, thereby rotating the motor. Due to this rotation, the cam collar 54 turns to the other end side of the engagement groove 53b, and then rotates together with the cam 53 as shown in FIG. 52a, only the cam 53 rapidly rotates due to the spring pressure of the contact piece 52, and as shown in FIG.
As a result, the contact piece 52 is switched to quickly turn off the motor contact.

However, even in such a device, a disc-shaped scale is provided around the main shaft, and the time is displayed on this scale.
If the time could be set finely or the device could be operated with a light rotational force, it would have to be large, and there were restrictions on downsizing it for these purposes.

Furthermore, in the structure as described above, if it is desired to perform continuous motion, for example, as shown by the chain line in FIG.
3a', and at the position where the cam collar 54 has been completely rotated, that is, over the extension of the set time, the other recess 5
By fitting the protrusion 52a of the contact piece 52 into 3a', the motor contact 51a is turned off, thereby enabling continuous operation.

However, in this case, the engagement groove 53b
There is a play between the continuous operation scale and the time setting scale corresponding to the length of , and the interval between the time setting scales is restricted by that amount, making it even more difficult to read.

This invention was made in view of the above problems, and is a time switch that quickly returns the contact, eliminates the need for initial position adjustment during assembly, and eliminates play between the time-limit setting position and the continuous operation position. The purpose is to provide

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. 2 and the following drawings.

FIG. 2 is an exploded perspective view of the time switch of this embodiment, which includes a synchronous motor 3 mounted on a base frame 1, 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 spring 8, a slider 10, and a speed plate 11
, a time-limiting contact switch lever 12 , a motor contact switch lever 13 , a motor contact 14 and a time-limiting contact 15 , which are switched by these switch levers 12 and 13, respectively. A lid 2 is placed over the base frame 1, and a fitting claw 2a extending from the lid 2 is fitted into a fitting hole 1a of the base frame 1, thereby fixing the base frame 1.

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. 3 and 4.
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. 4, 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 pinion gear 7
As shown in FIG. 4, the pinion gear 7 is integrally attached to the upper end of a flexible pinion shaft 7a, and a reduction gear is connected to an input gear 7' also attached to the lower end. Mechanism 5
The rotational output decelerated from the pinion gear 7 is transmitted to the pinion gear 7.

The upper end of the pinion shaft 7a is movably supported in a triangular hole 2b formed in the lid 2, and is further pressed by a spring 8.
Due to this pressing force, the pinion gear 7 meshes 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 slider 10 to return to its initial position. Further, when the slider 10 is slid by an external operation, the pinion shaft 7a is bent and the pinion gear 7 and the rack 10a are disengaged, allowing the slider 10 to slide freely.

As shown in FIG. 2, 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 case 1, and the lever 10b protrudes from a slit 2c formed in the lid 2. The slider 10 can be slid by external operation.

One end of the slider 10, that is, the forward end during manual operation, is tapered to form a tapered portion 10c, and when setting the time limit, the tapered portion 10c controls the first and second switch levers 12, 13. The claw portions 12a and 13a can be smoothly guided and brought into contact with the side surface of the slider 10.

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 third
) are formed, and these allow the slider 10 to slide smoothly within the slide case 1d.

As shown in FIG. 2, 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, can freely move relative to the slider 10 by a certain distance in the sliding direction, and slides inside the slide case 1d along with the slider 10. It is something to do.

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 moves backward and returns, it is located on the left in the figure and its tip The portion 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 the initial position, the claw portion 13a of the switch lever 13 that was in contact with the side surface of the quick-moving plate 11 The first and second switch levers 12, 1 are moved momentarily to the right in the figure by being pressed by the switch levers 12, 1.
3 are both instantaneously returned to their initial positions.

As shown in FIG. 2, each of the switch levers 12 and 13 is rotatably supported at one end by a shaft 1f integrally formed with the base frame 1.
Claw portions 12a, 13a and contact operating portions 12b, 13b are formed on the free end sides of these, and the contact operating portions 12b, 13b are each provided 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 contact the side surfaces of the slider 10 and the speed plate 11, respectively, and the switch levers 12, 1
3 rotates to close the motor contact 14 and operate the time switch. 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, so that the time-limiting contact 15 and the motor contact 1
4 will be instantaneously reversed.

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 and 13 of each switch lever 12 and 13
a is guided by the tapered portion 10c and the slider 10
The switch levers 12 and 13 are rotated in the direction of arrow B to reverse the contact points 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,
The slider 10 approaches the initial position, and the claw portions 12a, 13a of the switch levers 12, 13 taper portion 1.
Even if 0c comes, the claw part 13 on the side of the speed plate 11
Since a is in contact, the contact will not return.

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. The switch levers 12 and 13 move rapidly in the direction of arrow C, and as a result, the switch levers 12 and 13 instantaneously return to their initial positions, and their contacts are instantaneously reversed.

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

Further, on the rear end side surface of the slider 10,
A lower position connected to the rear end of the speed plate 11, that is, a switch lever 1 for the motor contact 14.
As clearly seen in FIGS. 3, 6, and 7a, a tapered notch step 10e is formed on the sliding contact surface of the claw portion 13a of No. 3, and its extension is flattened. be.

Therefore, as shown in FIG. 7a, the claw portions 12a, 13a of the switch levers 12, 13 are respectively located on the side surfaces of the slider 10, and are in sliding contact with the side surfaces of the speed plate 11 and the slider 10, That is, when the slider 10 is moved further forward by manual operation from the ON state of each contact, the claw portion 13a of the switch lever 13 enters the notch step portion 10e, switches the contact piece 17, and turns off the motor contact. In other words, continuous operation is performed adjacent to the maximum time setting position.

Note that if you try to move the slider 10 further forward than this, the forward end of the slider 10 will move toward the slide case 1d.
It is regulated by coming into contact with the end of the

Further, a short flat portion 10f is connected to the rear extension of the rack 10a of the slider 10, and a tapered recess 10g for storing the pinion 7 is continuously formed at the rear of the flat portion 10f, and The rear portion of the recess 10g projects perpendicularly from the inner bottom surface onto the same plane as the flat portion 10f.

The positional relationship between the recess 10g and the notch step 10e is determined by the sliding operation of the slider 10.
As shown in Figure b, the claw portion 13 of the switch lever 13
Their relative positions are set so that the pinion 7 disposed at the rear position of the pawl portion 13a enters the recess 10g immediately before the pinion a enters the notch step portion 10e.

However, in this arrangement, when the motor contact is cut, the pinion 7, which is biased toward the slider 10, elastically enters the recess 10g, producing a clicking sound and providing a good operating feeling. Therefore, it is possible to reliably inform the operator that the time limit has been changed continuously from the set time.

In addition, when returning to the time limit setting value from this state, the pinion 7 first passes through the flat side surface 10f of the slider 10 along the tapered surface of the recessed 10g, and slides into the easy 1
While engaging with the rear end of 0a, by this time the claw part 1
It is led by the tapered surface of the notch 10e of 3a and is located again on the side surface of the slider 10 or the speed plate 11, thereby switching the motor contact 14 to the on side and returning the slider 10.

As explained above, in the time switch of the present invention, the time limit setting mechanism is a sliding type,
The switch lever is rotated by the slider that constitutes this, and a fast-moving plate is installed in this part so that the contact returns instantly when the slider returns to the initial position, so that when the contact is reversed, There is no possibility of arcing between the contacts and burning out the contacts, thereby extending the life of the contacts.Also, the initial position of the time setting mechanism does not need to be adjusted by simply inserting the slider into the slide case. It has advantages such as improved work efficiency.

Furthermore, in this invention, compared to a conventional disc-type time switch equipped with a speed mechanism, there is no play between the time limit setting position and the continuous operation position, and the effective range of the time scale can be correspondingly widened. , the scale does not become difficult to read, which is extremely advantageous when downsizing.

[Brief explanation of the drawing]

Figures 1a and b are explanatory diagrams showing the speed mechanism of a conventional disc type time switch, Figure 2 is an exploded perspective view showing an embodiment of the time switch according to the present invention, and Figure 3 is an explanatory diagram showing the speed mechanism of a conventional disc type time switch. FIG. 4 is a cross-sectional view taken along lines A-A and B-B in FIG. Side view of the slider, Figure 7 is a,
b is an explanatory sectional view showing the operational relationship between the slider and the switch lever. 1d...Slide case, 3...Synchronous motor,
5... Reduction gear mechanism, 7... Pinion gear, 9...
...One-way clutch mechanism, 10...Slider, 1
0a...Rack, 10e...Notch step, 11...
Speed plate, 12, 13...Switch lever, 12
a, 13a...Claw portion, 14, 15...Contact.

Claims (1)

[Claims] 1 A slider having a rack formed along the sliding direction, a motor, a reduction gear mechanism for reducing the rotation output of the motor, and a pinion gear meshing with the rack of the slider, the rotation output of the reduction gear mechanism a one-way clutch mechanism that drives the pinion gear to direct the slider to the initial position and slide it backward; a speed plate that slides along with the slider; and a speed plate that slides the slider appropriately from the initial position. two switch levers that come into operation when they come into contact with the side surfaces of the slider and speed plate when in position and are pressed by the sliders; and a time-limiting contact that is linked to one of the two switch levers. and a motor contact that interlocks with another switch lever, and when the slider is returned to the initial position together with the speed plate, the switch lever moves the speed plate with its contact force. The switch lever and the contact point are moved relative to the slider so that the switch lever and the contact point instantaneously reverse and return, and the sliding contact surface of the switch lever that drives the motor contact point at the rear of the slider A time switch in which a notch is formed, and the motor contact point is switched by engaging the switch lever with the notch when the slider is at its most forward slide position.