JPS623537B2 - - 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 interlocked with 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 . That is, when the power is turned on, the synchronous motor starts and the electromagnet is excited to rotate the driven gear via the clutch mechanism interlocked with the movable iron piece. A cam portion having a concave portion on the circumference of the driven gear is formed, and the time limit card 31 shown in FIG. 14 is urged counterclockwise around the fulcrum O by the spring force of the tension coil spring 39. ing. This time limit card 31 is released from its restraint by the movement of the movable iron piece due to the excitation of the electromagnet, and the tension coil spring 39
The cam driven piece 33 is brought into pressure contact with the cam portion of the driven gear by the spring force. When the driven gear rotates to the zero position, the cam driven piece 33 falls into the recess of the cam part due to the spring force of the tension coil spring 39, and the time limit card 3
1 rotates counterclockwise and its contact operating piece 3
2a and 32b open and close the time-limited contacts, open and close the motor contacts, and time-up.

Thereafter, when the power is turned off, the electromagnet is demagnetized, the movable iron piece is returned to its original position by the spring force of the return spring, the crack mechanism is released, and the time limit card 31 is pulled by the return spring to the coil spring 39.
The time-limited contact rotates slightly clockwise against the
Motor contacts also return.

However, at the time of the above time up,
The load on the time limit card 31 due to the contact piece of the time limit contact and the motor contact increases as the time limit card 31 rotates, as shown by D in FIG. 15, and the rotation moment of the time limit card 31 due to the tension coil spring 39 is It is necessary that the load be larger than the load at time-up. On the other hand, as shown in _FIG .
OA is l ₁ , and the angle from B to the perpendicular to OA is θ
_1. When the spring force is P ₁ , the rotational moment M ₁ is expressed by the formula M ₁ =P ₁ ·l ₁ · _cosθ1 . The spring force P ₁ decreases as θ ₁ becomes smaller and l ₁ ·cos θ ₁ decreases as the time limit card 31 rotates during time-up, and the rotational moment M ₁ decreases as shown in Fig. 14 B and Fig. 15 F. It decreases as shown in , and increases due to the rotation at the time of return.

In this case, the spring force P ₁ of the tension coil spring 39 needs to be increased to some extent in order to obtain the rotational moment M ₀ required to open and close the time-limited contact and the motor contact. As mentioned above, the rotational moment at the time of return is obtained from the spring force of the return spring of the movable iron piece of the electromagnet that resists the spring force of the tension coil spring 39, and the spring force is as shown by G in FIG. It is minimum when returning to normal state, and increases when attracting, so an electromagnet with a large attracting force is required, which has the disadvantage of increasing size and cost.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a time-limited relay that can sufficiently restore a time-limited card even with an electromagnet with a small attraction force, and that can be made smaller and reduce costs. It is in.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

1 to 5 show a self-resetting type time-limited relay according to the present invention, which schematically includes a frame 1,
Electromagnet 10, contact drive section 30, clutch mechanism 45, contact mechanism 50, waren motor 75
, 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 on a metal plate, and an indicator lamp 8 is attached to the side of the mounting base 2.
A printed circuit board 9 holding a is installed.

The electromagnet 10 is constructed by fitting a spool 13 with a coil 14 wound around an iron core 12 fixed to an iron core frame 11, and attaching a movable iron piece 15 to the tip of the iron core frame 11 so that the movable iron piece 15 can rotate freely and applying a return force with a return spring 16. It is attached to the iron core frame 11 on the mounting base part 2 of the frame 1.
It is fixed by tightening screws 17, 17 from the side pieces 11a. The operation lever 18 transmits the operation of the movable iron piece 15 of the electromagnet 10 to the contact drive unit 30 and the clutch mechanism 45 via a conversion lever 26, which will be described in detail below, and also transmits the operation of the movable iron piece 15 of the electromagnet 10 to the contact drive unit 30 and the clutch mechanism 45.
It opens and closes a, 54b, and guide holes 19, 1
9 (see FIG. 6A) 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-right direction in FIG.
is engaged with a protrusion 15a formed at the center of the movable iron piece 15 in the width direction of the tip. The guide plate 23 is fixed by inserting the projections 24 and pins 25 into holes 69a, 69b, and 69c of the terminal block 65 shown in FIG. The conversion lever 26 is
As shown in FIG. 7, the center hole 27 is loosely fitted into the pin 25 of the guide plate 23 and is rotatably mounted, and includes an operation piece 28a for operating the time limit card 31 of the contact drive unit 30, and a clutch mechanism. An operation piece 28b for operating the clutch lever 46 of 45, and a protrusion 29 located at a rotationally symmetrical position of approximately 180° about the rotational fulcrum.
a and 29b are projected. This protrusion 29a
is a groove 21 formed on the side of the operating lever 18.
It is engaged with a.

In addition, in the case of a self-resetting type as in this embodiment, the operation lever 18 shown in FIG. The iron piece 15 rotates clockwise in FIG.
When the operation lever 18 moves to the left in FIG. 2, the conversion lever 26 rotates clockwise, and when the operation lever 18 is demagnetized and moves to the right, the conversion lever 26 rotates counterclockwise. On the other hand, when using the electric return type, the other configuration remains the same, and the operating lever 18 shown in FIG.
6 is engaged, and the conversion lever 26 is rotated counterclockwise when energized and clockwise when demagnetized, contrary to the self-resetting type, based on the excitation and demagnetization of the electromagnet 10. We are trying to transform the movement. These series of operations will be detailed later.

The contact drive unit 30 includes a time limit card 31 and a driven gear 4.
0, and the time limit card 31 is rotatably mounted on a support shaft 3 fitted into a hole 64 of a terminal block 65 (see FIG. 10), which will be described below, and as shown in FIG. Pieces 32a, 32b, cam driven piece 33
One end of the tension coil spring 39 is locked to the column 5 of the frame 1, and the other end is locked to the time limit card 31.
By being engaged with a pin 37 protruding from the side, it is constantly biased in the counterclockwise direction in FIG. 1 by the spring force of the tension coil spring 39. Further, the time limit card 31 is operated by rotating the conversion lever 26 in a counterclockwise direction and contacting the adjustment member 36 attached to the protrusion 35 with its operation piece 28a, as shown in FIG. Rotates clockwise 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 conversion lever 26
The position where the operation piece 8a contacts can be finely adjusted. The driven gear 40 has a ring-shaped cam portion 41 having a cutout portion 41a formed on its lower surface, and a protrusion 42 that engages with a stopper piece 96 (see FIG. 4) of a well-known time setting device 95 on its upper surface. It is rotatably mounted on a support shaft 4 protruding from the frame 1, and is constantly biased clockwise in FIG. 1 by the unwinding force of a coiled return spring 44 (see FIG. 3). There is. 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 at an arbitrary rotation angle.

As shown in FIG. 9, the clutch mechanism 45 has clutch gears 47a and 47b directly connected to the upper and lower ends of a shaft portion 46a formed on a clutch lever 46 so as to be rotatable, and a boss portion 46b is connected to the driven gear 4.
0 and is rotatably mounted on the same axis (support shaft 4), and is constantly biased in the clockwise direction in FIG. 1 by locking one end of the return spring 44 to the lever portion 46c. The clutch gear 47a is the Warren motor 7
The clutch gear 47b can mesh with the output gear 77 of No. 5, and the clutch lever 46 can mesh with the output gear 77 of the driven gear 4.
Since it is disposed coaxially with the driven gear 40, the clutch lever 46 remains in mesh with the driven gear 40 even when the clutch lever 46 rotates.

Further, when the converting lever 26 is rotated counterclockwise, the operating piece 28b thereof can come into contact with the lever portion 46c of the clutch lever 46. At this time, the clutch lever 46 can be rotated counterclockwise in FIG. The clutch gear 47a is disengaged from the output gear 77 of the Warren motor 75.

As shown in FIGS. 10 to 12, the contact mechanism 50 includes a fixed contact piece 51 having a fixed contact 52 constituting an instantaneous contact, movable contact pieces 53a and 53b having movable contacts 54a and 54b, and a time-limiting contact. a fixed contact piece 55 having a fixed contact 56,
Movable contact piece 57 having movable contacts 58a and 58b
a, 57b, and the fixed contact 6 that constitutes the motor contact.
0 and a movable contact piece 61 having a movable contact 62. The above fixed contact piece 5
1, 55, and 59 are fixed to the terminal block 65 by insert molding, as shown in Figure 10.

The movable contact pieces 53a, 57a, 61 are
As shown in FIG. 1, it is fixed to the terminal block 70 by insert molding, and is integrated by fitting the holes 71, 71 of the terminal block 70 into the protrusions 66, 66 of the terminal block 65. One movable contact piece 53b, 57b
Also the terminal block 7 shown in Figure 1 or Figure 4
2 by insert molding, and the terminal block 65
It is fixed to one side of the. Above terminal block 7
The side surfaces of the movable contact pieces 53a, 53b, 57a, 57b are inclined at an angle θ with respect to the installation direction of the movable contact piece 53a, for example, and are in close contact with the side surface of the terminal block 65, so that the movable contact pieces 53a, 53b, 57a, 57b ,61
is urged inward by its own springiness, and the fixed contact 5
The contact pressures for 2, 56, and 60 are obtained.

The contact mechanism 50 which has been made into a block in this manner allows the lower surfaces of the protrusions 67, 67 of the terminal block 65 to come into contact with the mounting base part 2 of the frame 1, and the claw part 6
It is fixed by gripping at 8. At this time, the upper portions of the movable contact pieces 53a and 53b are pressed against the operating piece 22 of the operating lever 18, and the movable contact pieces 53a and 53b
The upper part of 7a, 57b, 61 is the above-mentioned time limit card 31
The contact operation pieces 32a and 32b are pressed against each other.

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

Next, the operation of the time-limited relay (self-resetting type) having the above configuration will be explained.

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.
moves to the right, and the movable contact 53a of the momentary contact driven by the operation piece 22 opens and closes, while the movable contact 53b closes. At this time, the protrusion 29a of the conversion lever 26 is engaged with the groove 21a of the operating lever 18, so that the conversion lever 26 is slightly rotated counterclockwise from the position shown in FIG. 2 about the pin 25 as a fulcrum.

Due to this rotation, the time limit card 31 is moved to the adjustment member 3.
6 is pressed by the operation piece 28a of the conversion lever 26 and urged clockwise in FIG. is being restrained.
At this time, the contact operation piece 32a of the time limit card 31,
32b, the movable contact 58a opens and closes, the movable contact 58b closes, and the movable contact 62 closes as the time limit card 31 rotates clockwise. has been completed.

On the other hand, the operating piece 28b of the conversion lever 26 presses the lever portion 46c of the clutch lever 46, and the clutch lever 46 rotates counterclockwise in FIG. 1 against the spring force of one end of the return spring 44. The clutch gear 47a is the output gear 77 of the Warren motor 75.
has been disengaged from the

The time is set using the knob 97 of the time setting device 95.
This is done by rotating the . That is, as described above, the projection 42 engages with the stopper piece 96 that rotates together with the knob 97, and the operating gear 4 rotates accordingly.
0 is set to an arbitrary rotation angle.

Now, when the power is turned on, the electromagnet 10 is energized and the movable iron piece 15 is attracted to the iron core 12 and rotates clockwise in FIG. The contact 54b is closed and the indicator lamp 8 lights up. Further, based on the movement of the operating lever 18 to the left, the conversion lever 26 rotates in the clockwise direction in FIG. 46 will be released. At this time, the time limit card 31 is pulled by the tension coil spring 39 and rotates counterclockwise in FIG.
0, the clutch lever 46 rotates clockwise in FIG.
7a meshes with the output gear 77 of the Warren motor 75.

At the same time (when the power is turned on, motor contact 6
0 and 62 are closed), the Warren motor 75 is started, and the rotational driving force is transmitted from the output gear 77 to the driven gear 4 via the clutch gears 47a and 47b.
0, and 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. cam driven piece 3
3 falls into the cutout part 41a of the cam part 41 by the spring force of the tension coil spring 39, and this fall 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 to the counterclockwise direction in FIG. 1 and returns to the state described at the beginning. 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.
When the operating piece 28a presses the adjustment member 36, the time limit card 31 is rotated and restrained in the clockwise direction in FIG. 1, and the movable contact 58a, which is a time limit contact, is
is opened and the movable contact 58b is closed, and at the same time, the motor contacts 60 and 62 are closed. On the other hand, the contact piece 28b of the conversion lever 26 presses the lever portion 46c of the clutch lever 46, so that the clutch lever 46 rotates counterclockwise in FIG. 1, causing the clutch gear 47a to mesh with the output gear 77. It will be canceled. Further, the driven gear 40 is operated by the return spring 44 until the protrusion 42 comes into contact with the stopper piece 96.
That is, the rotation angle is returned to the fixed rotation angle in the clockwise direction, and time-limited setting can be performed again.

In the above operation, the load on the time limit card 31 due to the movable contact pieces 57a, 57b, 61 of the time limit contact and the motor contact is as shown by D in FIG. ). On the other hand, the rotational moment M ₃ of the time limit card 31 is determined by setting the fulcrum at O, the locking points of the tension coil spring 39 at A and B, OA at l ₃ , and OA and A Assuming that the angle formed by the perpendicular line from to OB is θ ₃ and the spring force is P ₃ , the rotational moment M ₃ is expressed by the formula M ₃ =P ₃ ·l ₃ · _cosθ3 . As for the rotational moment M ₃ , θ ₃ increases _{and P 3 decreases as the time limit card 31 rotates during time-up, but l 3 ·} cos θ ₃ increases more than the amount of decrease, so as a result, It increases as shown by B in FIG. 13 and F in FIG. 16. Therefore, the rotational moment M ₃ at the start of the time-up operation is smaller than the rotational moment M ₀ required to open and close the time-limiting contacts 58a and 58b and to open and release the motor contacts 60 and 62, and the tension and compression are reduced accordingly. The coil spring 39 can be small. Moreover, the rotational moment M ₃ shows the minimum value at the time of return, which means that the electromagnet 1
This means that even if the spring force of the return spring 16 attached to 0 is smaller than the conventional one shown as G in FIG. 15, as shown by G in FIG. You can use a smaller one with less suction power.

As is clear from the above explanation, according to the present invention, the tension coil spring is attached to the time limit card in such a way that when the card rotates at time-up, the rotational force increases as the card rotates. The rotational moment of the card is smaller at the start and return of time-up operation than at time-up, so the return spring force of the movable iron piece of the electromagnet is correspondingly smaller, allowing the use of an electromagnet with a smaller attraction force, and making the time-limited relay itself more compact. Therefore, it is possible to reduce costs.

[Brief explanation of the drawing]

1 is a plan view of a time-limited relay according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a rear view of FIG. 1, FIG. 4 is a right side view of FIG. 1, and FIG. The figures are the left side view of Fig. 1, Fig. 6 A and B are front views 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. 9 is a view of the clutch lever. FIG. 10 is a perspective view of the contact mechanism; FIG. 11 is a perspective view of the contact mechanism;
Fig. 12 is a plan view of the contact mechanism, Fig. 13 is a perspective view of the main parts of Fig. 1, Fig. 13 A and B are explanatory diagrams and graphs showing its rotational moment, and Fig. 14 is a conventional time-limiting relay. 14A and 14B are explanatory diagrams and graphs showing the rolling moment, FIG. 15 is a graph showing the characteristics of the conventional time-limiting relay, and FIG. 16 is the characteristics of the time-limiting relay according to the present invention. This is a graph showing. 1... Frame, 5... Support, 10... Electromagnet, 5... Movable piece of iron, 31... Time limit card, 39
... Coil spring, 40 ... Driven gear, 41 ... Cam portion, 47a, 47b ... Clutch gear, 50 ...
...Contact mechanism, 75...Waren motor.

Claims (1)

[Scope of Claims] 1. A driven gear set at an arbitrary rotation angle by a time-limited setting device is brought to the zero position by transmitting rotational force from a synchronous motor via a clutch mechanism that is linked to the operation of a movable iron piece of an electromagnet. In a time-limiting relay that opens and closes a time-limiting contact by a slight rotation of the time-limiting card in conjunction with the cam part of the driven gear when rotated, one end of the tension coil spring is fixed to a fixed part such as a frame, and the other end thereof is used. is locked to the above-mentioned time limit card so that a spring force acts in the direction in which the card rotates at time-up, and a straight line connecting the rotation fulcrum of the time limit card to the other end locking point of the tension coil spring and the tension coil The angle formed by the locking point at the other end of the spring and the perpendicular to the straight line connecting the rotation fulcrum of the time limit card and the locking point at one end of the tension coil spring increases as the time limit card rotates due to the spring force. time-limited relay.