JPH0239329Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a time-limited relay that opens and closes contacts for a limited time.

<Prior art and its problems> Conventionally, in this type of time-limited relay, the drive card that opens and closes the contacts for a limited time comes into contact with the movable iron piece of the energized electromagnet when it rotates, and its rotation stroke is regulated. At the same time, the movable iron piece is pressed and rotated back due to the return operation of the movable iron piece as the electromagnet is demagnetized. However, according to this method, since the drive card directly contacts the movable iron piece, the rotation stroke can only be adjusted by adjusting the set position of the drive card or the movable iron piece, and assembly adjustment is extremely troublesome. There was a drawback.

As another conventional example, in order to eliminate the above-mentioned drawback, an adjustment tool whose protrusion amount can be adjusted is provided on the movable iron piece, and the drive card is brought into contact with the engagement part of the adjustment tool to regulate the rotation stroke. There is a device in which the rotation stroke is also adjusted by adjusting the amount of protrusion of the adjustment tool.

However, in any of the above-mentioned conventional examples, the drive card comes into contact with the movable iron piece or its adjustment tool during rotation due to the spring force, and is further impulsively pressed by the movable iron piece or its adjustment tool when it returns to rotation. .
In the latter case, the movable iron piece or its adjustment tool rotates and therefore simultaneously slides into frictional contact with the abutment portion of the drive card.

For this reason, the movable iron piece or the engaging portion of the adjustment tool is extremely susceptible to wear due to the above-mentioned impact and friction, resulting in a drawback that the initial adjustment position may be deviated. For this reason, some devices have been devised such as making the adjustment tool made of PBT resin containing glass fibers or making the tip semicircular, but in the case of the former, the exposure of the glass fibers due to initial wear may actually accelerate the wear. However, all of them had the drawback of being insufficient. In addition, in this case, in order to overcome the frictional resistance caused by the above-mentioned friction, it was necessary to increase the spring force that urges the movable iron piece in the return direction, which increases the power consumption of the electromagnet that operates the movable iron piece, resulting in cost reduction. This has disadvantages in that the temperature inside the device rises and the lifespan of parts is shortened.

<Purpose of the invention> The object of the invention is to provide a time-limited relay that eliminates the above-mentioned drawbacks by suppressing wear and frictional resistance caused by impact contact with the drive card, friction, etc.

<Configuration and Effects of the Invention> As described above, in the configuration of the time-limiting relay according to the present invention, the engaging portion of the adjustment tool of the movable iron piece that comes into contact with the drive card is coated with a relatively hard fluorocarbon resin. Therefore, when the drive card comes into impactful contact with the engagement part of the adjustment tool, or when the drive card is impulsively pressed by the engagement part to return to rotation and at the same time frictionally slides into contact, the engagement of the adjustment tool Since the hardness of the part is increased by the coating, it will not wear out due to the above-mentioned impact contact and friction, and the initial adjusted position can be maintained well, improving the accuracy of operation. In addition, since the engaging part of the adjustment tool has a high hardness due to the coating, the sliding friction due to sliding contact is extremely small, and the power consumption of the electromagnet required for this can be reduced, which is advantageous in terms of cost, and also reduces the temperature rise in the device. It has the advantage of improving lifespan.

<Embodiment of the invention> Figures 1 and 2 are exploded perspective views and assembled perspective views showing one embodiment of the time-limited relay according to the invention, respectively, and Figures 3 and 4 show the case with the case removed. They are a front view and a back view of the left state.

The time-limited relay according to the present invention generally includes a forming frame 1,
Contact drive section 15, contact mechanism section 35, and electromagnet 5
5, a synchronous drive machine 70, a base 75, and a case 85. Each member will be explained below in the order of assembly.

The molding frame 1 is integrally molded from a suitable synthetic resin, and includes a mounting base 2 for the contact drive section 15, a support column 7,
7', 8, terminal block mounting part 9 formed at one end;
It consists of a mounting base 11 for an electromagnet 55.

The contact drive unit 15 consists of a clutch arm 16, a drive card 20, and a driven gear 26. The clutch arm 16 is approximately L-shaped, and clutch gears 17a and 17b are coaxially attached to one end of the clutch arm 16 so as to be rotatable together. , by loosely fitting the boss portion 18 formed at the other end onto the support shaft 3 formed on the mounting base 2 of the molding frame 1, the molding frame 1 is rotatably mounted on the mounting base 2 using the support shaft 3 as a fulcrum. There is. Further, this clutch arm 16 has a ring 19b of a return spring 19 wound around the boss portion 18 fitted into the protrusion 4, and one end 1
By engaging the clutch arm 9a with the stepped portion 16a, the clutch arm 16 is constantly biased in the direction of arrow A, and this biasing force causes the side surface 16b of the clutch arm 16 to come into contact with the lever portion 63 of the movable iron piece 62 of the electromagnet 55, which will be described in detail below. regulated by.

The drive card 20 has contact operation pieces 21, 22 and a cam follower piece 23, and a hole 24 bored at one end is secured to a support shaft 5 formed in the mounting base 2 of the molding frame 1 with an E ring 32. By loosely fitting the support shaft 5
It is rotatably mounted on the mounting base 2 using the fulcrum as the fulcrum. Further, a colored time limit operation display section 25 is formed on the upper surface of the drive card 20, and a protrusion is formed on the side of the display section 25, that is, on the side where the drive card 20 rotates in the direction of arrow B (see FIG. 6). 25a is formed, and the movement of the protrusion 25 along with the rotation of the drive card 20 after a set time has elapsed can be visually observed from the display window 87 of the case 85, as will be described in detail below. The driven gear 26 has a flat plate portion 2 on the upper surface.
7. It has a ring-shaped cam 28 with a cutout 28a on its lower surface, and is rotatably attached to the support shaft 3 by loosely fitting the center hole 29 into it. This driven gear 26
The clutch gear 17b meshes with the clutch gear 17b, the driven piece 23 of the clutch arm 20 can come into contact with the outer peripheral surface of the cam 28, and the other end of the return spring 19 is inserted into the hole 31 formed in the flat plate portion 27. 19c
By fixing the driven gear 26, when the driven gear 26 is forcibly rotated in the direction of arrow A, the return spring 19 is wound around the boss portion 18 of the clutch arm 16, and a return rotational force in the opposite direction of arrow A is applied. .
Further, the driven gear 26 is fixed by the return spring 19 when the movable pointer 30 provided on the flat plate portion 27 abuts the stopper piece 93 protruding downwardly from the setting pointer 92 of the knob 90 of the time limit setting device 89 in the clockwise direction. The force is regulated, and when setting the time, by rotating the knob 90, it rotates following the switch piece 93 that rotates together with the knob 90,
Set to any rotation angle.

The contact mechanism section 35 includes a fixed contact piece 36 having a fixed contact 37 constituting a time-limited contact, a movable contact 39a,
39b, a movable contact piece 41 having a movable contact 42 constituting a motor contact, and a fixed contact piece 43 having a fixed contact 44.
, a fixed contact piece 46 having a fixed contact 47 and a movable contact piece 48 having a movable contact 49, which constitute a momentary contact. Each of the above contact pieces 38a, 38b,
A reinforcing plate 40 made of a conductive material is provided at the bottom of 43 and 48.
a, 40b, 45, 45a are fixed, and the contact piece 3
The reinforcing plate 45 is attached to a terminal block 50 made of synthetic resin as appropriate along with 6, 41, and 46, and the reinforcing plate 45 functions as a stopper for regulating the operating position of the fixed contact piece 43.

This contact mechanism part 35 is attached to the terminal block mounting part 9 of the molding frame 1 from below, and the protrusion 51 is attached to the molding frame 1.
The terminal block 50 is inserted into the small hole 10 from below, and fixed by passing a mounting screw 82b (described below) from the mounting hole 81b of the base 75 into the small hole 53 drilled in the projecting piece 52 of the terminal block 50. The mounting direction of each contact piece is the same direction as the output shaft of the synchronous motor 70. In addition, the movable contact pieces 38a, 38
The upper part of the movable contact piece 41 is provided with a spring property on the right side in FIG. They are in pressure contact and apply a return force (rotational force about the support shaft 5 as a fulcrum) to the drive card 20 in the direction of arrow B in FIG.

The electromagnet 55 has a spool 59 wound with a coil 60 fitted onto an iron core 58 fixed to an iron core frame 56, and a movable iron piece 62 rotatably attached to one end of the iron core frame 56 and a return force applied by a return spring 61. The iron core frame 56 is mounted on the mounting base 11 provided on the side adjacent to the side of the forming frame 1 to which the contact mechanism section 35 is attached.
The mounting screw 82a is inserted through the mounting hole 81a of the base 75, which will be described in detail below, with the lower surface of the base 75 placed in contact with the
It can be attached by screwing into the screw hole 57. The movable iron piece 62 has lever parts 63, 64, 6
5, the tip of the lever portion 63 can come into contact with the side surface 16b of the clutch arm 16 as described above, and the lever portion 64 has an adjusting tool 66 (FIGS. 3 and 8).
(see figure) is fixed.

That is, the adjustment tool 66 has a fixing hole 66a at the bottom.
, an engaging protrusion 67a and an engaging stepped portion 67b on the upper part,
A thin plate portion 66c having flexibility is integrally molded in the intermediate portion using a suitable synthetic resin. Here, the engaging protrusion 67a has a hard coating portion 69 coated with a fluororesin (for example, polytetrafluoroethylene) at its tip, as shown by the matte pattern in FIG.

The adjustment tool 66 has a protrusion 66b with a fixing hole 66a formed on its inner surface, so that it fits into the protrusion 64a of the lever section 64 of the movable iron piece 62, and the adjustment screw 68 is screwed into the screw hole 64b of the lever section 64. the tip of the adjustment screw 68 is in the recess 6 of the adjustment tool 66.
6d (see FIG. 3), the thin plate portion 66c is slightly bent, and the engagement protrusion 67a and the engagement step portion 67b are displaced forward. Adjustment screw 68 to the rear
By loosening the thin plate portion 66c, the thin plate portion 66c is displaced. The coating portion 69 of the engagement protrusion 67a of the adjustment tool 66 has the operation piece 22 of the drive card 20.
The end surface 22a of the engaging step portion 67b can be brought into contact with the engaging step portion 67b.
The upper part of the movable contact piece 48 of the contact mechanism section 35 can come into contact with the movable contact piece 48 . Further, the instantaneous operation display board 33 (see FIG. 6) having the display section 33a has one end connected to the movable iron piece 6.
The movable iron piece 62 is fixed to the tip of the lever part 65 of the molding frame 1, and the elongated hole 34 formed at the other end is loosely fitted to the support shaft 5 of the molding frame 1. Based on
The display window 88 of the case 85 slides to the left and right as shown in FIG.
It is visible from the

The synchronous motor 70 has a built-in motor main body in the lower part, a reduction gear device in the upper part, and an output gear 71 protruding from the upper surface. It protrudes upward from the hole 6 and meshes with a clutch gear 17a provided on the clutch arm 16.

The base 75 has pin terminals 76 and positioning protrusions 77 on its lower surface so as to be inserted into a predetermined socket, and the pin terminals 76 are wired with lead wires 78 on its upper surface. The base 75 has a screw hole 57 in which a mounting screw 82a is inserted from the mounting hole 81a of the base portion 80 into the core frame 56 of the electromagnet 55.
At the same time, screw the mounting screw 82b into the mounting hole 8.
It is fixed to the molding frame 1 by screwing into holes (not shown) drilled in the lower surface of the supports 7, 7' of the molding frame 1 from 1b. At this time, the mounting base 11 of the forming frame 1 is fixed by being clamped between the stepped part 80a of the stand part 80 of the base 75 and the iron core frame 56 of the electromagnet 55. Further, the synchronous drive machine 70 has a lower surface and a base 75.
An elastic rubber plate 72 is interposed between the molding frame 1 and the molding frame 1 to be housed in the central space 12 while maintaining impact resistance. Further, a large number of lead wires 78 are connected to the contact pieces 36, 38a, 38b, 41, 43, 4.
6 and 48 to a predetermined circuit, and a resistor 69 is attached to the side of the column 8 of the forming frame 1.
and is connected to a predetermined circuit.

The case 85 is integrally molded of a suitable synthetic resin, is placed over the molding frame 1, and is fixed by fitting the engagement hole 91 into the protrusion 79 of the base 75. Further, the display windows 87 and 88 are provided on the upper surface 86 of the case 85, and a well-known time limit setting device 89 is installed, and the knob 90 is connected to the support shaft 3 via a slip means (not shown). ing.

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

First, the power is turned off, the movable iron piece 62 of the electromagnet 55 rotates counterclockwise in FIG. 3, and the lever portion 63 of the movable iron piece 62 in FIG. The clutch arm 16 rotates in the opposite direction of arrow A around the support shaft 3, and the clutch gear 17a rotates in the direction opposite to the arrow A.
The meshing with the output gear 71 is released, and
The other clutch gear 17b is the driven gear 26.
It meshes with the Adjuster 64 for the movable iron piece 62
The coating portion 69 of the engagement protrusion 67a of the adjustment tool 66 provided in the adjustment tool 66 comes into contact with the end surface 22a of the operation piece 22 of the drive card 20, and the drive card 20 rotates in the direction opposite to the arrow B using the support shaft 5 as a fulcrum. As shown in FIG. 3, when contact 39a is closed, contact 3
9b is opened, the motor contacts 42, 44 are closed, and the instantaneous contacts 47, 49 are opened when the movable contact piece 48 is pressed against the engagement step 67b of the adjustment tool 66.

Time setting is performed by rotating a knob 90 of a time limit setting device 89 installed in the case 85 by a predetermined angle. That is, the movable pointer 30 is attached to the stopper piece 93 that rotates together with the knob 90 as described above.
The driven gear 26, which is engaged and rotates accordingly, is set at an arbitrary rotation angle.

Now, when the power is turned on, the movable iron piece 62 is attracted to the iron core 56 and rotates clockwise in FIG. Therefore, the clutch arm 16 is slightly rotated in the direction of arrow A by the spring force of the return spring 19, and the clutch gear 17a
meshes with the output gear 71 of the synchronous motor 70. Since the clutch arm 16 of the other clutch gear 17b is coaxially attached to the driven gear 26 and the support shaft 3, it rotates slightly while being meshed with the driven gear 26.

Further, the engagement step portion 67b of the adjustment tool 66 releases the pressing force against the movable contact piece 48, and the instantaneous contact 4
7 and 49 are closed.

At the same time as the motor contacts 42 and 44 are closed, the synchronous motor 70 starts, 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, when 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 drive card 20.
As described above, since the movable contact piece 41 applies a returning force in the direction of arrow B, the drive card 20 falls into the cutout part 28a of the cam 28, and the drive card 20 is attached to the support shaft 5.
It rotates slightly in the direction of arrow B about the fulcrum, and the rotation is restricted by the end surface 22a of the operating piece 22 coming into contact with the coating portion 69 of the engagement protrusion 67a of the adjustment tool 66. At this time, time-limited contacts 39a, 39
When b is switched, the motor contacts 42 and 44 are opened, and the synchronous drive machine 70 is stopped.

This completes the time-limited operation and turns off the power.
The movable iron piece 62 rotates counterclockwise in FIG. 3 and returns to the above-mentioned initial state. That is, the clutch arm 16 rotates in the direction of arrow A,
While the clutch gear 17a is disengaged from the output gear 71 of the synchronous drive 70, the drive card 20
rotates slightly in the direction opposite to arrow B, and the time-limiting contacts 39a,
39b is switched, and the motor contacts 42, 4
4 is closed, and instantaneous contacts 47, 49 are opened.

In the above configuration, in the drive card 20, the end surface 22a of the operation piece 22 is connected to the engagement protrusion 67a of the adjustment tool 66.
The rotation stroke is regulated by contacting the coating portion 69 of the movable iron piece 62, and the return movement of the movable iron piece 62 (rotation in the counterclockwise direction in FIG. 3) when the electromagnet 55 is demagnetized causes the adjustment tool 66 to It is pressed and rotates back. Adjustment of this rotational stroke is performed by screwing the adjustment screw 68 in and out.

In this case, since a hard coating portion 69 is formed on the engagement protrusion 67a of the adjustment tool 66,
Despite the impact contact of the drive card 20 with the engagement protrusion 67a and the impact contact and frictional sliding contact of the engagement protrusion 67a with the drive card 20 when the drive card 20 returns to rotation, the engagement does not occur. Coupling protrusion 6
7a accurately maintains the initial setting position with almost no wear, improving operational accuracy. Furthermore, since the coating portion 69 has a large hardness and an extremely small coefficient of friction, the movable iron piece 62 operates efficiently, and the power consumption of the electromagnet 55 can be reduced, which is advantageous in terms of cost, and also suppresses heat generation of the device and improves its life. sell.

[Brief explanation of drawings]

Figures 1 and 2 are an exploded perspective view and an assembled perspective view showing an embodiment of the time-limiting relay according to the present invention, respectively, and Figures 3 and 4 are front views with the case removed, respectively. 5 is a partially cutaway left side view of the case and the knob, FIGS. 6 and 7 are a partially cutaway plan view and a plan view, respectively, and FIG.
The figure is an exploded perspective view of the main parts. 15... Contact drive unit, 16... Clutch arm, 17a, 17b... Clutch gear, 20...
Drive card, 26...driven gear, 28...cam,
35...Contact mechanism section, 37, 39a, 39b...
Time-limited contact, 55...electromagnet, 62...movable iron piece,
64... Lever part, 66... Adjustment tool, 67a...
Engagement protrusion, 69... coating portion, 70... synchronous motor.

Claims (1)

[Scope of utility model registration request] A driven gear is rotated by a predetermined angle by rotating a time setting device attached to the case, and the rotational force from the motor is transmitted through a clutch gear that is displaced in conjunction with the movement of a movable iron piece as the electromagnet is excited. In the time relay, the drive card rotates at a predetermined angle in conjunction with the cam portion of the driven gear to open and close a predetermined time contact when a set time has elapsed. An adjusting tool having an engaging part coated with a relatively hard material is installed, and the driving card comes into contact with the engaging part of the adjusting tool during the rotation to restrict the rotational stroke, and furthermore, the driving card A time-limited relay configured to be pressed by the engaging portion and rotated back by the return operation of the movable iron piece as the electromagnet is demagnetized.