JPH0736220Y2 - Motor type actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a motor type actuator in which the operation of various controlled members such as a drain valve unit is controlled by a motor.

(Prior Art) There is a motor type actuator in which the operation of various controlled members is controlled by a motor. FIG. 9 shows a conventional example, which is an example in which the drain valve unit is controlled.

In FIG. 9, the rotational force of the motor 1 is represented by the gears 2, 3, 4,
It is designed to be transmitted to a gear train consisting of 5
A gear 6 that is movable in the axial direction is arranged above. The gear 6 is biased by a spring in a direction away from the gear 5. A tip end portion of a lever 7 which is rotatable in a vertical plane and whose rotation position is controlled by a solenoid 8 is located above the axis of the gear 6. The gear 5 and the gear 6 constitute a clutch mechanism. When the solenoid 8 is excited, the lever 7 is rotated to push down the gear 6 against the biasing force so that the gear 6 and the gear 5 are connected. Has become.
A gear 9 is always engaged with the gear 6. A spiral cam 10 is integrally provided on the shaft of the gear 9. On the cam edge of the cam 10, one arm of a lever 11 having a bell crank shape, which is rotatable in a horizontal plane, is pressed against the cam edge by a rotational biasing force of a spring 12. A drain valve 14 of a drain valve unit 13 is connected to the other arm end of the lever 11 via a rod 15. The gear train including the motor 1 and the clutch mechanism is usually configured as a motor unit in one unit.

If the solenoid 8 and the motor 1 are energized at the same time, the rotational force of the motor 1 is transmitted to the gear 9 and the cam 10 is rotationally driven while the clutch mechanism including the gear 5 and the gear 6 is connected. The rotation of the cam 10 pushes the lever 11 against the biasing force to open the drain valve unit 13 as shown in the figure. In this state, if the motor 1 is de-energized, the drain valve unit 13 is held open. Next, when the solenoid 8 is de-energized, the clutch composed of the gears 5 and 6 is disengaged, and the gears 6 and 9 and the cam 10 are in the idle state,
The lever 11 rotates in the urging direction to move the drain valve 14 to the left in the figure, and the drain valve unit 13 is closed. The rotation of the lever 11 causes the cam 10 to be reversed in the original rotation position.

(Problems to be Solved by the Invention) According to the conventional motor type actuator, as is apparent from the conventional example shown in FIG. 9, the motor section requires the gear section including the clutch mechanism, and the external portion of the motor section is not required. However, since it requires a solenoid, a lever, etc., it has a large number of parts, resulting in poor productivity and easy failure. In addition, a separate control circuit and sensor are required to stop the controlled member while moving it to a predetermined position with a cam, and the actuator unit itself does not determine the stop position. I had a problem with.

The present invention has been made to solve the above-mentioned conventional problems, and enables reciprocal movement control of a controlled member with a mechanically and electrically simple structure, and has a bounce phenomenon at the time of starting the motor. However, it is an object of the present invention to provide a motor type actuator that does not malfunction.

(Means for Solving Problems) The present invention provides a motor equipped with a reverse movement prevention mechanism for preventing reverse movement at the time of start-up, and a motor driven by this motor.
A cam member having a drive part for moving the controlled member, a first switch means which is switched by the cam member and which can select one of two energizing paths to the motor, and the first switch. Means for selecting one of two energizing paths to the motor, and second switch means for selecting one of the two energizing paths, wherein the first switch means alternates between the two energizing paths by the cam member. The cam member is composed of two cam members linked by driven means, and one of the cam members is driven by a motor so that the cam member can rotate integrally with the rotation. While being attached,
The other cam member is attached so as to be rotatable relative to the rotation of the motor, and the driven means moves backward when the motor is started until the reverse movement is prevented by the reverse movement preventing mechanism. However, this reverse movement range is characterized by having a play so as not to switch the energizing path.

(Operation) When the cam member is driven by the motor, the controlled member is moved by the drive portion of the cam member. When the controlled member is moved to a predetermined position, the cam member switches the first switch means to select the other energization path to the motor, and the motor stops. Next, when the second switch means selects the other energization path to the motor, the energization path selected by the first switch means is closed, the motor is energized, and the cam is driven again. By driving this cam, the first switch means switches the energization path to the motor again to cut off the energization to the motor.
If the motor tries to move backward when the motor is started, the backward movement prevention mechanism prevents the backward movement. In this reverse movement range, the first switch means is not switched by the play of the follower means of the cam member.

(Embodiment) An embodiment of the motor type actuator according to the present invention will be described below with reference to the drawings. It should be noted that all of the illustrated embodiments are examples in which the present invention is applied as an actuator for controlling a drain valve.

In FIG. 1 and FIG. 2, the motor denoted by reference numeral 21 is a single-phase AC inductor type motor, and the output shaft 27 is rotationally driven through the reduction gear train inside, and prevents reverse rotation at the time of starting. It is equipped with a reverse rotation prevention mechanism to rotate only in a fixed direction. A switch cam 23 and a lever 24, which form a cam member, are attached to the output shaft 27. The switch cam 23 is inserted so as to be rotatable relative to the output shaft 27. The lever 24 is pressed in from above. Output shaft into which lever 24 is press fitted
The end of 27 and the hole of the lever 24 are formed in a D shape to prevent mutual rotation. Pin 24 is attached to the bottom side of lever 24.
a is formed, and the pin 24a has a long hole 23a formed in the rotation direction of the switch cam 23 as shown in FIG.
The pin 24a and the long hole 23a form a follower means for the switch cam 23 and the lever 24 that form a cam member. The switch cam 23 has a play in the rotational direction with respect to the lever 24 in the range of the elongated hole 23a. Lever 2
A pin 24b as a drive unit for moving the controlled member is formed on the upper surface side of 4. The outer peripheral portion of the switch cam 23 is a fan-shaped cam edge having a large diameter portion formed over a range of approximately 180 degrees, and the contact 25a of the micro switch 25 as the first switch means is pressed against the cam edge. is doing. The micro switch 25 has three contacts, and each time the switch cam 23 rotates by 180 degrees, the switch cam is switched between a normally closed contact side and a normally open contact side.
23 cam edges are formed. A cylindrical portion 23c is formed on the lower surface side of the switch cam 23. A leaf spring 26 is in pressure contact with the cylindrical portion 23c so that even if the output shaft 27 rotates, the lever
Within the range of the long hole 23a of the switch cam 23 with respect to the pin 24a of 24, the switch cam 23 is prevented from rotating due to the frictional force due to the pressure contact of the leaf spring 36. In addition, pin 24
The relationship between a and the long hole 23a may be reversed between the switch cam 23 and the lever 24. That is, a pin may be provided on the switch cam side and an elongated hole may be provided on the lever side.

FIG. 3 shows a specific use example of the above embodiment. However,
Here, the switch cam 23 and the lever 24 are simplified and shown as a substantially integrated cam member 23.
Twenty-four pins 24b are shown as the drive portion 24b provided on the cam member 23.

In FIG. 3, one end of a lever 28 is pivotally attached to the drive portion 24b, and the other end of the lever 28 is a drain valve of the drain valve unit 30.
The drain valve unit 30 is pivotally mounted to the cam 29 so that the drain valve unit 30 is opened and closed when the cam member 23 rotates by 180 degrees. Reference numeral 25 is a micro switch having a medium contact CM, a normally open contact NO, and a normally closed contact NC, and the contact 25 of the switch 25.
a is in pressure contact with the cam edge of the cam member 23. The middle contact CM of the micro switch 25, the motor 21, and the AC power supply 31 are connected in series. The normally-open contact NO and the normally-closed contact NC of the microswitch 25 respectively constitute two current-carrying paths to the motor 21, and one of the two current-carrying paths may be selected alternately depending on the operation mode of the microswitch 25. It has become. Further, the switching contacts of the changeover switch 32 as the second switch means are connected to the two energizing paths. The changeover switch 32 is for switching the drain valve unit 30 between the open side and the closed side, the open side contact is connected to the normally closed contact NC of the micro switch 25, and the closed side contact is the normal side of the micro switch 25. Connected to open contact NO. With this connection, the change-over switch 32, together with the micro switch 25, selects one of the two energizing paths to the motor 21.

The changeover switch 32 may be a mechanical contact type or a non-contact electronic type using a switching semiconductor or the like. The micro switch 25 is a cam member.
It may be replaced with a type in which the rotational position of 23 is detected optically or magnetically and switched.

Next, the operation of the above-described embodiment will be described with reference to FIGS. 4 and 5.

In the initial state, the cam member 23 is in the rotation position as shown in FIG. 4, the drain valve 29 closes the drain valve unit 30, and the micro switch 25 is switched to the normally closed contact NC side. ing. The changeover switch 32 is on the closed side, and the energization path to the motor 21 is open.

Therefore, when the changeover switch 32 is switched to the open side by some command or manually, one of the energization paths to the motor 21 is closed and the motor 21 is started. The rotation direction of the motor 21 is constant, and the rotation of the motor 21 causes the cam member to rotate.
The 23 is rotationally driven in the clockwise direction as indicated by an arrow in FIG. 4, for example. When the cam member 23 rotates 180 degrees,
As shown in FIG. 5, the micro switch 25 is switched to the normally open contact NO side, the energization path to the motor 21 is opened, and the motor 21 is stopped. Further, the drain valve 29 is moved to the left and stopped with the drain valve unit 30 open.

Next, when the selector switch 32 is switched to the closing side, the motor 21
The other energization path is closed, the motor 21 is started again, and the cam member 23 is rotationally driven in the clockwise direction. Cam member
When 23 rotates 180 degrees and reaches the rotation position as shown in FIG. 4, the micro switch 25 is switched to the normally closed contact NC side, the energization path to the motor 21 is opened, and the drain valve 29 is opened. The motor 21 stops with the drain valve unit 30 closed and returns to the initial state.

The switch cam 23 and the lever 24 in FIGS. 1 and 2 have been described above as one body. However, in an actual single-phase inductor AC motor, when a reverse rotation prevention mechanism is inserted in the gear train to determine the rotation direction and an attempt is made to rotate in the opposite direction at startup, the rotating body hits the contact portion of the reverse rotation prevention mechanism. There are those that come in contact with each other and bounce back to rotate them in a predetermined direction.In such a motor, the output shaft 27, the switch cam 23, and the lever are provisionally used.
If 24 is integrated, the switch cam 23 may rotate slightly in a predetermined direction at the time of startup and then rotate in a predetermined direction. Therefore, the switch cam 23, which is stopped immediately after the contact of the micro switch 25 is switched, reverses the micro switch 25 to the state before switching again, and the energization path to the motor 21 is opened immediately after being closed. I got burned, and in the end,
Even if the changeover switch 32 is changed over, the switch cam 23 may stop almost without moving.

Therefore, in the above embodiment, the lever 24 and the switch cam 23 are separated from each other, and a slight play is provided between the lever 24 and the switch cam 23 in the rotational direction due to the relationship between the pin 24a and the elongated hole 23a. . With this arrangement, at a predetermined rotation, there is no play on the rotational direction side between the pin 24a and the elongated hole 23a as shown in FIG.
This state is maintained immediately after 25 switches and stops. Then, in this state, when the above-mentioned bounce occurs at the time of starting and then it is attempted to rotate in a predetermined direction, as shown in FIG. 7, the pin 24a once moves backward in the range of the elongated hole 23a. After that, to start moving in a predetermined direction,
The switch cam 23 is never moved in the opposite direction,
Therefore, since the energization path to the motor 21 is not opened, the inconvenience that the motor 21 stops can be solved. In this case, since the leaf spring 26 shown in FIG. 1 holds down the switch cam 23, the switch cam 23 is not rotated in the opposite direction together when the lever 24 is rotated in the reverse direction. In addition, the pin 24a and the long hole 23a forming a part of the cam member
By doing so, it is possible to prevent the energizing path from being switched until the reverse movement prevention mechanism of the motor prevents the backward movement of the motor. It is possible to reduce the size of the device.

INDUSTRIAL APPLICABILITY The motor type actuator according to the present invention can be applied to, for example, a drain valve for a washing machine and others that repeatedly perform a motion of moving a predetermined amount and stopping. Further, the controlled member may have any form of motion as long as it has a predetermined reciprocating motion, and may have a linear motion as well as a rotary motion.

As the first switch means used in the present invention, instead of the microswitch 25 in the above-mentioned embodiment, two two-contact leaf type switches may be used as in the embodiment of FIG. In FIG. 8, a leaf type switch 34 having two contacts a and c1 and a leaf type switch 35 having two contacts b and c2 are symmetrically arranged with the switch cam 23 in between, and the switch cam 23 is 180 The switch 34 and the switch 35 are alternately opened and closed with every rotation. The contacts c1 and c2 of the switches 34 and 35 are connected in common and connected in series with the middle contact of the motor 21, the AC power supply 31 and the changeover switch 32, and the open contact of the changeover switch 32 is the contact a of the switch 34. Further, the closed contact of the changeover switch 32 is connected to the contact b of the switch 35. By connecting the switch 34 and the switch 35 in this manner, one of the two energizing paths to the motor 21 is alternately selected. Reference numeral 28 is a lever, 29 is a drain valve, and 30 is a drain valve unit, which are configured in the same manner as in the above-described embodiment.

The embodiment shown in FIG. 8 operates similarly to the above-mentioned embodiment. Here, the range of the large diameter portion of the switch cam 33 is set to a size such that the switches 34 and 35 are not turned off even when the motor 21 is slightly reversed when starting. Therefore, for example, since the switch 35 is turned on earlier before the switch 34 is turned off due to the rotation of the switch cam 23, the switch 35 is kept in the on state even if it is slightly reversed due to a rebound phenomenon when the motor 21 is started, The motor 21 never stops. Therefore, in the case of this embodiment, it is not necessary to separate the cam member into the switch cam 23 and the lever 24 as in the above embodiment.

According to the present invention, the controlled member is driven by the cam member driven by the motor, and two energizing paths to the motor can be alternately selected together with the second switch means. Since the switch means 1 is switched,
Even if a special sensor, a detection circuit, a solenoid or the like is not provided outside, the motor can be stopped when the controlled member is driven to a predetermined position, and the controlled member can be held at that position. It is possible to provide a motor-type actuator having a small number of parts and high productivity and high reliability. Further, the cam member is composed of two cam members which are integrally rotatable by driven means, and one of the cam members is attached so as to be movable relative to the rotation of the motor. Since the driven means of the cam member has a play for preventing the energization path from being switched in this reverse movement range even if the motor tries to move backward at the time of starting, reliability from which malfunction does not occur in this respect as well. A highly efficient motorized actuator can be provided. Further, since the cam member is formed so as not to switch the energization even when the motor is started and it tries to move in the reverse direction until the reverse movement is prevented by the reverse movement preventing mechanism, the reverse movement preventing means for the cam member is separately provided. The number of parts can be reduced, and the size of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a motor type actuator according to the present invention, FIG. 2 is a partial sectional front view of the same embodiment, and FIG. FIG. 4 is an explanatory view showing the operation of the above embodiment according to FIG. 3, and FIG. 5 is an explanatory view showing another operation mode of the above embodiment according to FIG. 3, FIG. Is a plan view showing the engagement relationship between the switch cam and the lever in the above embodiment, FIG. 7 is a plan view showing another mode of the engagement relationship between the switch cam and the lever, and FIG. 8 is the present invention. FIG. 9 is a schematic view showing another embodiment, and FIG. 9 is a perspective view showing an example of a conventional motor type actuator. 21 ... Motor, 23 ... Switch cam forming part of cam member, 24 ... Lever forming part of cam member, 24b ... Drive part, 25 ... First switch means, 29 ... Controlled Drain valve as a member, 32, 34, 35 ... Second switch means.

Claims (1)

[Scope of utility model registration request] 1. A motor having a reverse movement preventing mechanism for preventing reverse movement at the time of start-up, a cam member driven by the motor and having a drive portion for moving a controlled member, and the cam member. And a first switch means capable of selecting one of two energizing paths to the motor, and one of the two energizing paths to the motor combined with the first switch means. A second switch means, wherein the first switch means is connected by the cam member so that the two energizing paths are alternately switched, and the cam member is linked by the follower means. Two cam members, one of which is driven by a motor and is attached so as to be rotatable integrally with the rotation of the other, and the other cam portion. Is mounted so as to be rotatable relative to the rotation of the motor, and the driven means moves in the reverse direction even when the motor moves backward until the reverse movement is prevented by the reverse movement prevention mechanism at the time of starting the motor. A motor-type actuator having a play in the rotation direction so as not to switch the energization in a range.