JPS6042438Y2 - Cam mechanism of time-limited relay - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor-type return type time-limited relay.

Conventionally, in this type of time-limited relay, a driven gear is set at an arbitrary rotation angle by a time-limited setting device, and the rotational force from a synchronous motor is transmitted through a clutch mechanism linked to a movable iron piece of an electromagnet to bring it to the zero position. There is a device that opens and closes the time limit contact by rotating the time limit card slightly in conjunction with the cam portion of the driven gear when the time limit card rotates up to .

However, in this case, when the time limit card returns, the gap between the card and the outer peripheral surface of the cam part, that is, the return position of the protrusion that contacts the cam part of the time limit card must be adjusted using a thickness gauge. Moreover, since adjusting this gap also affects the contact portion and the electromagnet linking portion, these must be readjusted, which is extremely complicated.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to provide a cam mechanism for a time-limited relay that allows for easy adjustment of the gap between the time-limited card and the outer peripheral surface of the cam part at the time of return. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings, which are exemplary embodiments.

First, the cam mechanism of the time-limited relay according to the present invention will be explained with reference to FIGS. has been done.

This cam portion 41 is always biased in the clockwise direction (returning direction after time limit operation), and the protrusion 42 comes into contact with a stopper piece 96 attached to a knob of a time limit setting device (not shown) as shown in FIG. The return rotational position is regulated by this, and the rotational drive is driven in the counterclockwise direction during the time limit operation.

Further, a recess 41a is formed on the outer peripheral surface of the cam portion 41, and the recess 41a protrudes from the outer peripheral surface of the cam portion 41 immediately after the direction in which the cam portion 41 of the recess 41a rotates during time-limiting operation (counterclockwise direction). A protrusion 41b is formed, and another recess 41c is formed immediately after the protrusion 41b.

The time limit card 31 has contact operation pieces 32a and 32b, and is rotatably attached to the support shaft 3, and is always rotated counterclockwise around the support shaft 3 by a coil spring 39 whose one end is locked to the protrusion 34. The projecting piece 33a is biased so as to come into contact with the outer circumferential surface of the cam portion 41.

This protruding piece 33a is formed into a bifurcated shape with a rigid protruding piece 32b, and the bent protruding piece 3 has a spring property toward the protruding piece 33b side.
It is pressed toward the cam portion 41 by the tip of the adjustment screw 37 screwed onto the cam portion 3b.

Therefore, the gap between the projecting piece 33a and the outer peripheral surface of the cam portion 41 can be adjusted by screwing the adjusting screw 37 in and out.

To explain this adjustment method, first, as shown in Figure 1,
Screw in the adjustment screw 37 and attach the protrusion 33a to the cam portion 41.
It is bent to the side and plunged into the recess 41c.

At this time, the protruding piece 33a comes into contact with the side surface of the protrusion 41b because the cam portion 41 is biased clockwise.

As the adjusting screw 37 is screwed out, the protruding piece 33a moves upward due to its own springiness, and when its tip matches the tip end surface of the protrusion 41b (see the opening in FIG. 13), the cam part 41 returns to rotation. Due to the force, the protrusion 42 rotates approximately one rotation in the clockwise direction until it comes into contact with the stopper piece 96 (see the opening in FIG. 13).

At this time, the gap between the outer circumferential surface of the cam portion 41 and the protruding piece 33a is adjusted to G shown in FIG. 13.

Therefore, the protruding piece 33a can be adjusted to the gap G at any time using this adjustment method.

That is, the amount of protrusion of the protruding piece 41b from the cam portion 41 is set to be an amount corresponding to the gap G to be adjusted.

Further, the time limit is set by rotating a setting knob (not shown).

The cam portion 41 is set at an arbitrary rotation angle by the projection 42 of the cam portion 41 being rotated in conjunction with the rotation of the stopper piece 96 which rotates together with the setting knob (see FIG. 13-2).

When an electromagnet (not shown) is turned on at the set position,
The time limit card 31 rotates slightly counterclockwise about the support shaft 3, and the waist protrusion 33a comes into contact with the outer peripheral surface of the cam portion 41 (see FIG. 13-2).

At the same time as the electromagnet is turned on, a synchronous motor (not shown) is started and the cam portion 41 rotates counterclockwise together with the driven gear.

When the settling time has elapsed, as shown in FIG. 13E, the protruding piece 33a falls into the recess 41a, and the time limit card 31 rotates slightly counterclockwise to open and close the time limit contact and turn off the synchronous motor.

Thereafter, when the electromagnet is turned off, the time limit card 31 rotates clockwise, and the cam portion 41 returns to rotation in the clockwise direction until its protrusion 42 abuts against the stopper piece 96.

Next, a self-resetting type time-limited relay equipped with the above-mentioned cam mechanism will be explained.

1 to 5, the time-limited relay generally includes a frame 1, an electromagnet 10, a contact drive section 30, a clutch mechanism 45, a contact mechanism 50, a Warren motor 75,
It is composed of a base 85, a case 90, and a time setting device 95 attached to the upper surface of the case 90.

The frame 1 is made by outsert-molding resin onto a metal plate, and a printed circuit board 9 holding an indicator lamp 8 is installed on the side of the mounting base 2.

An electromagnet 10 has a coil 1 attached to an iron core 12 fixed to an iron core frame 11.
A movable iron piece 15 is rotatably attached to the tip of the iron core frame 11 and a return force is applied by a return spring 16. It is fixed by tightening screws 17 and 17 from the side piece 11a of the iron core frame 11 above.

The operation lever 18 is connected to the contact drive unit 3 via a conversion lever 26, which will be described in detail below, to operate the movable iron piece 15 of the electromagnet 10.
0, transmitted to the clutch mechanism 45 and instantaneous contacts 52, 54
a.

54b, which opens and closes the guide hole 19.19 (13th
(see illustration) is loosely fitted into the protrusion 24 and pin 25 (see Fig. 2) of the guide plate 23 so that it can slide freely in the left and right directions in Fig. 2, and the hole 20 formed at one end is at the tip of the movable iron piece 15. It is engaged with a protrusion 15a formed at the center in the width direction.

Note that the guide plate 23 has the protrusion 24 and the pin 25 at the tenth position.
It is fixed by being inserted into the holes 69a, 69b, and 69c of the terminal block 65 shown in the figure.

As shown in FIG. 7, the conversion lever 26 is rotatably mounted by loosely fitting the center hole 27 into the pin 25 of the guide plate 23, and has an operating piece 28a1 for operating the time limit card 31 of the contact drive section 30. The operating piece 28b that operates the clutch lever 46 of the clutch mechanism 45 and the operating piece 28b that operates the clutch lever 46 of the clutch mechanism 45 and the operating piece 28b that operates the clutch lever 46 of the clutch mechanism 45;
Protrusions 29a and 29b are provided at rotationally symmetrical positions of 80 degrees.

This protrusion 29a engages with a groove 21a formed on the side of the operating lever 18.

In addition, in this self-resetting type, the operating lever 18 shown in FIG. When the operating lever 18 rotates clockwise in FIG. 1 and moves to the left in FIG. 2, the conversion lever 2
6 rotates clockwise, demagnetizes, and when the operating lever 18 moves to the right, the conversion lever 26 rotates counterclockwise.

On the other hand, if the electric return type is used, the other configurations remain the same), and the operating lever 18 shown in the opening in Figure 6 is used, and the groove 2 is used.
1b is engaged with another protrusion 29b of the conversion lever 26, and the conversion lever 2
Contrary to the self-resetting type, 6 is rotated counterclockwise when energized and clockwise when demagnetized, thereby changing the operation.

These series of operations will be explained in detail later.

The contact drive unit 30 consists of a time limit card 31 and a driven gear 40, and the time limit card 31 is rotatably mounted on a support shaft 3 protruding from the mounting base 2 of the frame 1, as shown in FIG. and a contact operation piece 32a.

32b1 Above protruding pieces 33 a, 33 b, adjustment screw 3
7, one end of which is locked to the tip of the operation piece 28a of the conversion lever 26, and the other end of the coil spring 39 is locked to the protrusion 34, so that the coil spring 39 is constantly biased in the counterclockwise direction in FIG. There is.

Further, the time limit card 31 is operated by rotating the conversion lever 26 counterclockwise as described below and contacting the operating piece 28a with the adjustment member 36 attached to the protrusion 35, as shown in FIG. It rotates in the rotational direction and is restrained.

The adjustment member 36 has an eccentric hole (not shown) that fits into the protrusion 35 of the time limit card 31, and by rotating it to an appropriate angle, the position where the operation piece 28a of the conversion lever 26 comes into contact can be finely adjusted. be.

The driven gear 40 has a ring-shaped cam portion 41 formed on its lower surface with the above-mentioned recesses 41a, 41c1 and projections 41b, and has a projection 42 on its upper surface that engages with a stopper piece 96 (see FIG. 4) of a well-known time limit setting device 95. is formed, and frame 1
It is rotatably mounted on a supporting shaft 4 projecting upward, and is constantly biased clockwise in FIG. 1 by the unwinding force of a coiled return spring 44 (see FIG. 3).

This driven gear 40 is restricted from the biasing force of the return spring 44 by the projection 42 coming into contact with the stopper piece 96 of the time setting device 95 in the clockwise direction, and when setting the time, by rotating the knob 97, It rotates following the stopper piece 96 that rotates together with the knob 97, and is set to an arbitrary rotation angle.

The clutch mechanism 45 includes a clutch lever as shown in FIG.
A clutch gear 47 is attached to the upper and lower ends of the shaft portion 46a formed at 46.
a, 47b are directly connected and rotatable, and the boss part 4
6b is rotatably mounted on the same axis (support shaft 4) as the driven gear 40, and is constantly biased in the clockwise direction in FIG. 1 by locking one end of the return spring 44 to the lever part 46c. ing.

The clutch gear 47a is the output gear 7 of the Warren motor 75.
Since the clutch lever 46 is installed coaxially with the driven gear 40, the clutch gear 47b can be engaged with the driven gear 4 by rotation of the clutch lever 46.
0 and maintains the engaged state.

Further, when the conversion lever 26 is rotated counterclockwise, the operating piece 28b can come into contact with the lever part 46c of the clutch lever 46.
6 rotates slightly counterclockwise in FIG. 1, and the clutch gear 47a is disengaged from the output gear 77 of the Warren motor 75.

The contact mechanism 50, as shown in FIGS. 10 to 12,
Fixed contact piece 5 having a fixed contact 52 constituting a momentary contact
1. Movable contact pieces 53 a, 53 b having movable contacts 54 a, 54 b, a fixed contact piece 55 having a fixed contact 56 constituting a time-limited contact, a movable contact 58 a,
movable contact pieces 57a, 57b having 58b, and a fixed contact piece 59 having a fixed contact 60 constituting a motor contact;
It consists of a movable contact piece 61 having a movable contact 62.

The fixed contact pieces 51, 55, 59 are fixed to the terminal block 65 by insert molding, as shown in FIG.

The movable contact pieces 53a, 57a, 61 are fixed to the terminal block 70 by insert molding, as shown in FIG.
It is integrated by fitting into the

One movable contact piece 53b, 57b is also shown in FIG. 1 or 4.
It is fixed to the terminal block 72 shown in the figure by insert molding, and is fixed to another side surface of the terminal block 65.

For example, the side surface of the terminal block 70°72 has a movable contact piece 53.
Since the movable contact pieces 53a, 53b, 57a, 57b, and 61 are inclined at an angle θ with respect to the installation direction of the terminal 65 and are in close contact with the side surfaces of the terminal 65, the movable contact pieces 53a, 53b, 57a, 57b, and 61 are attached inward by their own spring properties. The contact pressure for the fixed contacts 52, 56, and 60 is obtained.

The contact mechanism 50 thus formed into a block is fixed by bringing the lower surface of the projections 67 and 67 of the terminal block 65 into contact with the mounting base part 2 of the frame 1 and holding it with the claw parts 68. Ru.

At this time, the upper parts of the movable contact pieces 53 a and 53 b are pressed against the operating piece 22 of the operating lever 18 , and the movable contact pieces 5
The upper portions of 7a, 57b, and 61 are pressed against the contact operation pieces 32a, 32b of the card 31 at the upper limit.

The Warren motor 75 has a rotor section 7 equipped with an output gear 77.
6 and an electromagnetic core 79 equipped with bear coils 80, 80.
, and a stator section 78 consisting of an electromagnetic coil 81.The rotor section 76 is temporarily fixed to the lower surface of the mounting base section 2 of the frame 1 by gripping claws (not shown).

Next, a time-limited relay (self-resetting type) consisting of the above configuration
Explain the operation.

First, when the power to the electromagnet 10 and Warren motor 75 is turned off, the electromagnet 10 is demagnetized, so the movable iron piece 15 returns and rotates counterclockwise in FIG. 1, and the operating lever 18 moves to the right. However, as for the instantaneous contacts driven by the operation piece 22, the movable contact 53a opens and closes, and the movable contact 53b closes.

At this time, the conversion lever 26 has the protruding piece 29a inserted into the insertion lever 1.
Since it is engaged with the groove 21a of No. 8, it has rotated slightly counterclockwise about the pin 25 from the position shown in FIG. 2 as a fulcrum.

Due to this rotation, the adjustment member 36 of the time limit card 31 is pressed by the operation piece 28a of the conversion lever 26, and the time limit card 31 is urged clockwise in FIG.
a is restrained at a position spaced apart from the cam portion 41 of the driven gear 40.

At this time, the contact operation pieces 32a and 32b of the time limit card 31
The time limit contact and motor contact driven by the time limit card 31 are rotated clockwise to move the movable contact 58a
is opened and separated, and the movable contact 58b is closed, and the movable contact 62 is closed.

On the other hand, the operation piece 28b of the conversion lever 26 is a clutch lever.
46, the clutch lever 46 rotates clockwise in FIG. 1 against the spring force of one end of the return spring 44, and the clutch gear 47a
The meshing with the output gear 77 of No. 5 is released.

Time setting is performed by rotating the knob 97 of the time setting device 95.

That is, the stopper piece 96 rotates together with the knob 97.
As described above, the driven gear 40, which engages with the protrusion 42 and rotates accordingly, is set to an arbitrary rotation angle.

Now, when the power is turned on, the electromagnet 10 is energized, the movable iron piece 15 is attracted to the iron core 12, and the rotating waist operating lever 18 moves to the left in the clockwise direction in FIG. 54b is closed and the indicator lamp 8 lights up.

Further, based on the leftward movement of the operating lever 18, the conversion lever 26 rotates clockwise in FIG.
a releases the restriction on the time limit card 31, and
The operation piece 28b releases the restraint on the clutch lever 46.

At this time, the time limit card 31 is pulled by the coil spring 39 and rotates counterclockwise in FIG. The clutch gear 47a rotates in the clockwise direction and meshes with the output gear 77 of the Warren motor 75.

At the same time (when the power is turned on, motor contacts 60 and 62
is closed), the Warren motor 75 starts, and the rotational driving force is transferred from the output gear 77 to the clutch gear 47a,
47b to the driven gear 40.
rotates counterclockwise in FIG. 1 while winding up the return spring 44.

FIGS. 1 to 5 illustrate this state.

When the driven gear 40 rotates by a predetermined angle in the counterclockwise direction in FIG. The protruding piece 33a falls into the recess 41a of the cam part 41 by the spring force of the coil spring 39, and this falling occurs when the time limit card 31 slightly rotates counterclockwise in FIG. Rotation is regulated by the adjustment member 36 coming into contact with the operation piece 28a of the conversion lever 26.

At this time, the time-limiting contacts 58a and 58b are switched (the movable contact 58a is closed and the movable contact 58b is opened), the motor contacts 60 and 62 are opened and separated, and the Warren motor 75 is stopped.

The time-limited operation is thus completed, and when the power is turned off, the movable iron piece 15 returns counterclockwise in FIG. 1 and returns to the state described above.

That is, the operating lever 18 moves to the right, the movable contact 53a opens and closes, the indicator lamp 8 goes out, and the movable contact 53b closes.

At the same time, the conversion lever 26 rotates counterclockwise in FIG. 2, and the operating piece 28a presses the adjustment member 36, so that the time limit card 31 rotates clockwise in FIG. 1 and is restrained. The movable contact 58a, which is a time-limiting contact, opens and closes, and the movable contact 58b closes, and the motor contacts 60 and 62 close.

On the other hand, the operation piece 28b of the conversion lever 26 is connected to the clutch lever.
By pressing the lever portion 46c of the clutch lever 46, the clutch lever 46 is rotated counterclockwise in FIG. 1, and the clutch gear 47a is disengaged from the output gear 77.

Further, the driven gear 40 is rotated clockwise again by the return spring 44 until the protrusion 42 comes into contact with the stopper piece 96, that is, to the settled rotation angle, and becomes movable again for a fixed time.

As is clear from the above explanation, according to the present invention, the time-limiting card and the cam can be moved by simply displacing the spring-like projecting piece of the time-limited card along the protrusion formed on the cam section using a spring means. The gap with the outer peripheral surface can be adjusted accurately and easily.

Moreover, this gap adjustment only moves the protrusion that comes into contact with the cam part and does not move the entire time limit card, so it does not affect the contact part or the electromagnet linking part, and there is no need to readjust these parts. It is.

[Brief explanation of drawings]

Figure 1 is a plan view of a time-limited relay equipped with a cam mechanism according to the present invention, Figure 2 is a front view of Figure 1, Figure 3 is a rear view of Figure 1, and Figure 4 is the right side of Figure 1. 5 is a left side view of FIG. 1, FIG. 6 is a front view of the operating lever, FIG. 7 is a perspective view of the conversion lever, FIG. 8 is a perspective view of the time limit card, and FIG.
The figure is a perspective view of the clutch lever, Figures 10 and 11 are perspective views of the contact mechanism, Figure 12 is a plan view of the contact mechanism, and Figure 13 is a perspective view of the clutch lever.
Figures A9, C, II and H are explanatory views of the operation of the cam mechanism according to the present invention. 10... Electromagnet, 15... Movable piece of iron,
31...Limited time card, 32 a, 32 b
...Contact operation piece, 33a...Protrusion piece, 3
7...adjustment screw, 40...driven gear,
41...cam part, 41a...recessed part, 4
1b...Protrusion, 47a, 47b...Clutch gear, 50...Contact mechanism, 75...
... Warren motor, 77 ... Output gear.

Claims (1)

[Scope of utility model registration request] When the driven gear, which is set at an arbitrary rotation angle by the time setting device, rotates to the zero position by transmitting the rotational force from the synchronous motor through the clutch mechanism that is linked to the operation of the movable iron piece of the electromagnet, the time limit card is activated. In a time relay in which the time limit contact is opened and closed by slightly rotating in conjunction with the cam portion of the driven gear, and the driven gear returns to the time setting position and rotates, the time limit card is capable of coming into contact with the cam portion. A projecting piece having spring properties is formed, and the position of this projecting piece with respect to the cam part can be adjusted as appropriate by a screw means,
A cam of a time-limiting relay characterized in that a recess into which the protruding piece falls is formed in the cam part, and a protrusion protruding from the outer peripheral surface of the cam part is formed immediately after the direction in which the cam part of the recess rotates during time-limited operation. mechanism.