JPS5945167B2 - Clutch mechanism in time-limited relays - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a time-limited relay, in particular, a driven gear rotated by a predetermined angle by a time-limit setting device is transmitted with rotational force from a synchronous motor via a clutch mechanism to return to rotation, and a time-limited contact is activated. This invention relates to a clutch mechanism in a time-limited relay that opens and closes.

Conventionally, as shown in FIG. 1A, the clutch mechanism in this type of time-limited relay has been constructed by fixing a latch gear 93a to one end of a long clutch shaft 92 so as to be able to mesh with the output gear 95 of a synchronous motor 94; Driven gear 90 at the end
By fixing the latch gear 93b so that it can mesh with the latch gear 93b, while locking the tip of the drive lever 98 fixed to the movable iron piece 97 of the electromagnet 96 near the clutch gear 93b of the clutch shaft 92, and magnetizing and demagnetizing the electromagnet 96. Movable iron piece 9
7, the clutch shaft 92 swings via the drive lever 98 with the clutch gear 93a meshing with the output gear 95 of the synchronous motor 94, and the clutch gear 93b
There has been provided a device in which the driven gear 90 engages with and disengages from the driven gear 90.

In addition, as an improvement to the above, one end of the clutch shaft 92 is directly connected to the output shaft of the synchronous motor 94, and a coil spring 92a is provided in the middle of the clutch shaft 92, as shown in the opening of FIG. Based on the operation, the coil spring 92a is deflected via the drive lever 98,
A clutch gear 93b has been provided in which the driven gear 90 is engaged with and disengaged from the clutch gear 93b.

However, in both of the above, the clutch gear 93
The engagement or disengagement operation is performed in a state where b is inclined with respect to the driven gear 90, and there are large variations in the position accuracy of the clutch gear 93b, the pitch interval between the clutch gear 93b and the driven gear 90, etc., and the clutch operation is not possible. Although it is stable, it has the disadvantage that the setting time varies.

In particular, in the former case, the clutch shaft 92 requires a certain length, and the internal structure of the relay itself has the disadvantage of poor space efficiency.

The present invention has been made in view of the above-mentioned drawbacks, and the present invention has been made in view of the above-mentioned drawbacks. By attaching the output gear coaxially with the output shaft and rotatable in conjunction with the movement of the movable iron piece of the electromagnet, one of the clutch gears rotates around the output gear based on the rotation of the Clara and Cheer arm. The clutch is rotated slightly to maintain the engaged state at all times, and the other clutch gear engages and disengages the driven gear.This is a clutch in a time-limited relay that provides stable clutch operation, no variation in set time, and is space-efficient. The purpose is to provide a mechanism.

Next, the present invention will be described with reference to the accompanying drawings, which are one embodiment of the present invention.

The time-limited relay according to the present invention is generally composed of a molding frame 1, a contact drive section 15, a contact mechanism section 35, an electromagnet 55, a synchronous motor 70, a base 75, and a case 85, as described below. Each member will be explained in accordance with the assembly order.

The molding frame 1 is integrally molded from a suitable synthetic resin.
Mounting base for contact mechanism section 15 2. It consists of pillars 7 and 8, a terminal block 9 formed at one end, and a mounting base 11 for an electromagnet 55.

The contact drive unit 15 includes a clutch arm 16 and a drive card 20.
Clutch gears 17a and 1Tb are coaxially and integrally rotatably mounted on one end of the clutch arm 16, and a hole 18 formed at the other end serves as an output shaft of a synchronous motor 70, which will be described below. By loosely fitting into the output shaft 72, the output shaft 72 is rotatably mounted on the mounting base 2 using the output shaft 72 as a fulcrum.

Further, this clutch arm 16 is connected to a ring 19b of a return spring 19 wound around a support shaft 3 formed on the mounting base 2 of the molding frame 1.
is fitted into the protrusion 4, and the one end 19a is connected to the one side surface 1.
By engaging with an engagement groove (not shown) formed in the clutch arm 6a, the clutch arm 16 is constantly biased in the direction of the arrow (see FIG. 2), and this biasing force is generated by the movement of the electromagnet 55, which will be described in detail below, on the side surface 16b of the clutch arm 16. It is regulated by contacting the lever part 63 of the iron piece 62.

The drive card 20 has contact operation pieces 21 and 22 and a cam follower piece 2.
3, and by loosely fitting the hole 24 drilled at -m into the support shaft 5 formed in the mounting base 2 of the molding frame 1 with an E ring 32, the support shaft 5 can be set as a fulcrum. It is rotatably mounted on the mounting base 2 as a.

Further, a time limit display protrusion 25 is provided on the upper surface of the corner of the drive card 20.
is formed, and the movement of the protrusion 25 as the drive card 20 rotates when the set time has elapsed can be visually observed through a display window (not shown) of the case 85.

The driven gear 26 has a flat plate portion 27 on the top surface and a cutout portion 28a on the bottom surface.
It has a ring-shaped cam 28 having a center hole 29 which is loosely fitted onto the upper part of the support shaft 3 and is rotatably attached thereto, and a main shaft 30 is fixed to the center hole 29.

The clutch gear 17b meshes with the driven gear 26, and the clutch arm 20 is attached to the outer peripheral surface of the cam 28.
The driven gear 26 can be brought into contact with the driven piece 23, and the other end 19c of the return spring 19 is fixed to the hole 31 formed in the flat plate portion 27, so that the driven gear 26 returns when forcedly rotated in the direction of arrow A. The spring 19 is wound around the boss portion 18 of the clutch arm 16, and a return rotational force in the direction opposite to the arrow is applied.

The contact mechanism section 35 includes a fixed contact piece 36 having a fixed contact 37 constituting a time-limited contact. Movable contact 39a.

39b, a movable contact piece 41 having a movable contact 42 forming a motor contact, a fixed contact piece 43 having a fixed contact 44, and a fixed contact piece having a fixed contact 47 forming an instantaneous contact. 46, movable contact 4
9 and a movable contact piece 48.

Each of the contact pieces 38a, 38b. Reinforcing plates 4Qa, 40b, 45, 50 made of a conductive material are fixed to the lower part of 43, 48, and are press-fitted into the numerous mounting grooves 10 formed in the terminal block 9 of the molding frame 1 together with the contact pieces 36, 41, 46. The reinforcing plate 45 functions as a stopper for regulating the operating position of the fixed contact piece 43.

Further, the upper portions of the movable contact pieces 38a and 38b can face and come into contact with the operating piece 21 of the drive card 20, and the upper portion of the movable contact piece 41 is provided with spring properties on the right side in FIG. It comes into pressure contact with the operating piece 22 of the drive card 20, and exerts a return force (support shaft 5) on the drive card 20 in the direction of arrow B in FIG.
(rotating force with the fulcrum being the fulcrum).

The electromagnet 55 has a coil 6 attached to an iron core 58 fixed to an iron core frame 56.
A movable iron piece 62 is rotatably attached to one end of the iron core frame 56 and a return force is applied by a return spring 61.
With the lower surface of the iron core frame 56 placed on top of the base 75, a mounting screw 82 is inserted through the mounting hole 81a of the base 75, which will be described in detail below.
It can be attached by screwing a into the screw hole 57.

The movable iron piece 62 has lever parts 63, 64, 65,
As mentioned above, the tip of the lever part 63 is connected to the clutch arm 1.
An adjustment fitting 66 having an elongated hole 67 is fixed to the lever part 64 with a screw 68 so as to be positionable in the direction of arrow C in FIG. 5 through the elongated hole 67.

The end surface 66a (see FIG. 4) of the adjustment fitting 66 can be brought into contact with the end surface 22a of the operation piece 22 of the drive card 20, and the stepped portion 66b can be brought into contact with the upper part of the movable contact piece 48 of the contact mechanism section 35. It is possible.

Further, an instantaneous operation display board 33 is provided on the upper part of the lever part 65.
One end is fixed, and a long hole 34 (see FIG. 5) formed at the other end of the display plate 33 is loosely fitted to the support shaft 5 of the molding frame 1, and is movable by exciting and demagnetizing the electromagnet 55. Iron piece 62
It is possible to visually see from the display window (not shown) of the case 85 that the end portion 33a of the display board 33 moves in the direction of arrow C in FIG.

The synchronous motor 70 has a motor main body in the lower part, a reduction gear device in the upper part, and an output gear 71 on an output shaft 72 protruding from the upper surface.
The output gear 71 projects upward from the hole 6 of the mounting base 2 and meshes with the clutch gear 17a provided on the clutch arm 16.

The base 75 has a pin terminal 76 and a positioning protrusion 77 on the bottom surface.
It is configured to be inserted into a predetermined socket, and a pin terminal 76 is wired with a lead wire 78 on the top surface.

The base 75 connects the mounting screw 82a to the mounting hole 81a of the platform 80.
A screw hole 57 drilled in the core frame 56 of the electromagnet 55 from
At the same time, it is fixed to the molding frame 1 by screwing the mounting screw 82b from the mounting hole 81b into a hole (not shown) drilled in the lower surface of the column 7 of the molding frame 1.

At this time, the mounting base 11 of the forming frame 1 is attached to the base 8 of the base 75.
0 and the core frame 56 of the electromagnet 55.

Further, the synchronous motor 70 is housed in the central space 12 of the molding frame 1 with an elastic rubber plate 73 interposed between its lower surface and the base 75 while maintaining impact resistance.

Further, a large number of lead wires 78 are connected to the contact pieces 36, 38a.
, 38b, 41, 43, 46° 4-8 are connected to a predetermined circuit, and a resistor 69 is attached to the side of the column 8 of the molding frame 1 and connected to a predetermined circuit.

The case 85 is integrally molded by appropriate synthesis, and a time limit setting mechanism (not shown) is attached to the top surface 86.
A movable pointer (not shown) is fixed to the tip of the main shaft 30.

This case 85 is placed over the molding frame 1 and fixed by fitting the protrusion 79 of the base 75 into a recess (not shown).

Next, the operation of the time-limiting relay having the above configuration will be explained.

First, the power is turned off, and the movable iron piece 62 of the electromagnet 55 rotates in the counterclockwise direction in FIG.
The lever part 63 contacts the side surface 16b of the clutch arm 16, and the clutch arm 16 rotates in the direction of the arrow with the support shaft 3 as a fulcrum, and the clutch gear 17b engages with the driven gear 26.
At the same time, the other clutch gear 17a is also meshed with the output gear 71 of the synchronous motor 70.

Further, the end surface 66a of the adjustment fitting 66 provided on the lever part 64 of the movable iron piece 62 comes into contact with the end surface 22a of the operating piece 22 of the drive card 20, and the drive card 20 is moved in the opposite direction of arrow B with the support shaft 5 as a fulcrum. The time-limiting contact 39a is closed and the contact 39b is opened, and the motor contact 4
2.degree. 44 is closed, and the instantaneous contacts 47, 49 are opened when the movable contact piece 48 is pressed against the stepped portion 66b of the adjustment fitting 66.

The time is set by rotating a knob of a time setting mechanism (not shown) installed in the case 85 by a predetermined angle, thereby causing the driven gear 26 to rotate by a predetermined angle in the direction opposite to arrow A via the main shaft 30.

Now, when the power is turned on, the movable iron piece 62 is attracted to the iron core 56 and rotates in the direction of the hour hand in FIG.
Since the lever portion 63 releases the pressing force on the side surface 16b of the clutch arm 16, the clutch arm 16 is slightly rotated in the direction of the arrow by the spring force of the return spring 19, and the clutch gear 17b is rotated against the driven gear 26. mesh.

Another clutch gear 17a is the clutch arm 16
is attached to the output shaft 72 of the synchronous motor 70 coaxially with the output gear 71, so it rotates slightly while meshing with the output gear 71.

Further, the stepped portion 66b of the adjustment fitting 66 is connected to the movable contact piece 48.
The pressing force is released and the instantaneous contacts 47 and 49 are closed.

At the same time as the motor contacts 42 and 44 are closed, the synchronous motor 70 is started, and the rotational driving force is transmitted from the output gear 71 to the driven gear 26 via the clutch gears 17a and 17b. It rotates in the direction of arrow A while being rolled up.

When the drive card 20 has been rotated by a predetermined angle, in other words, after the set time has elapsed, the driven piece 23 of the drive card 20 that has been sliding on the outer peripheral surface of the cam 28 is rotated by the movable contact piece 41 as described above. Since a return force is applied in the direction B, the drive card 20 falls into the cutout 28a of the cam 28, and the drive card 20 slightly rotates in the direction of arrow B about the support shaft 5, and this rotation is caused by the operation lever. The end surface 22a of 22 comes into contact with the end surface 66a of the adjustment fitting 66, thereby being regulated.

At this time, the time limit contacts 39a and 39b are switched, the motor contacts 42 and 44 are opened, and the synchronous motor 70 is stopped.

The time-limited operation is thus completed, and when the power is turned off, the movable iron piece 62 rotates counterclockwise in FIG. 4 and returns to its initial state.

That is, the clutch arm 16 rotates in the direction of arrow B, and the clutch gear 17b is disengaged from the driven gear 26, while the drive card 20 slightly rotates in the direction of arrow B, and the time-limit contacts 39a and 39b open. Upon switching, motor contacts 42.44 are closed and instantaneous contacts 47.49 are opened.

In the above configuration, the clutch mechanism according to the present invention connects the clutch arm 16 to which the clutch gears 17a and 17b are coaxially and rotatably attached to the output gear 71 of the synchronous motor 70.
It is rotatably attached coaxially with the output shaft 72 provided with a rotor, and the return spring 19 applies a return rotational force, and the lever part 63 of the movable iron piece 62 of the electromagnet 55 comes into contact with the measuring surface 16b, causing the clutch arm 16 to move. It is designed to be rotated.

That is, the clutch arm 16 rotates about the output shaft 72 based on the rotation of the movable iron piece 62 by excitation and demagnetization of the electromagnet 55, and the clutch gear 17a rotates so that the clutch arm 16 is coaxial with the output '1iill wheel 71. Because it is attached, the peripheral part of the output gear 71 is kept in an engaged state and rotates slightly, while the other clutch gear 17
b engages and disengages the driven gear 26, turning on and off the transmission of rotational force from the synchronous motor 70 to the driven gear 26.

Therefore, according to the present invention, the clutch gear engages or disengages in parallel with the driven gear, and there is little variation in the positional accuracy of the clutch gear.
Stable clutch operation and accurate setting time can be obtained, and there is no need for a long clutch shaft as in the above-mentioned conventional technology, making it possible to provide a time-limiting relay with good space efficiency.

[Brief explanation of the drawing]

Figure 1A is a cutaway perspective view of a conventional clutch mechanism, Figure 2 and the following figures show a time-limited relay equipped with the clutch mechanism according to the present invention, Figure 2 is an exploded perspective view, and Figure 3 is an assembly of the main parts. 4 is a front view, FIG. 5 is a plan view, and FIG. 6 is a rear view. 16...Clutch arm, 17a, 17b...
...Clutch, gear, 19...Return spring,
26... Driven gear, 37, 39a, 39b...
...Time-limited contact, 55...Electromagnet, 62...
...Movable iron piece, 63...Lever part, 70.
...Synchronous motor, 71 ...Output gear, 7
2...Output shaft.

Claims (1)

[Claims] 1. In a time-limited relay in which a driven gear rotated by a predetermined angle by a time-limit setting device is rotated back by being transmitted with rotational force from a synchronous motor via an appropriate clutch mechanism to open and close a time-limited contact, the synchronous motor's A clutch arm, in which a latch gear capable of meshing with the output gear and a latch gear capable of meshing with the driven gear described above are coaxially and rotatably mounted, is coaxial with the output shaft provided with the output gear of the synchronous motor, and the electromagnet is movable. A clutch mechanism in a time-limited relay, characterized in that it is rotatably mounted in conjunction with the operation of an iron piece.