JPH0522775Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a motor actuator for operating an object driven by a motor. [Prior Art] For example, in a refrigerator equipped with a divided freezer compartment and a refrigerator compartment, cold air cooled by a cooler is sent into the freezer compartment or the refrigerator compartment. The supply of cold air is controlled by opening and closing a butthole provided in the passage from the cooler to the freezer compartment or from the cooler to the refrigerator compartment, and a motor actuator is used as the drive source for opening and closing. There is. This motor actuator uses the temperature of the refrigerator compartment as an input condition to turn on and off, and also uses the open/closed state of the driven object as an input condition. The rotation source of the above motor actuator is, for example,
Since it is an AC motor, its rotation direction is not limited to normal rotation, but may also rotate in reverse with a certain probability.
Further, the rotation of this motor is transmitted to the cam via a suitable reduction gear. This cam generates a signal to stop the rotating motor by turning on or off a corresponding switch. Therefore, when the profile of the cam changes from a low section to a high section or vice versa, the corresponding switch is switched on or off, and the motor is then automatically stopped. [Problems with the prior art] By the way, when a restart signal is given to a stopped motor, the motor reverses in an instant, and this reversal causes the cam to rotate in the opposite direction. The on/off switching direction will be reversed, leading to malfunctions in position detection such as bumps. Thus, due to the possibility of motor reversal,
There is a cause for malfunction in this type of motor actuator. [Purpose of the invention] Therefore, the purpose of the present invention is to take measures to prevent malfunctions even when the motor is reversed, thereby preventing malfunctions of the motor actuator. [Solution Means and Effects of the Invention] Therefore, the present invention provides a mechanism for controlling the rotation of the motor between a rotating member driven by the motor and a cam driven by the rotating member for operating the switch lever. When rotating in the opposite direction, the rotational force is directly transmitted, but when rotating in the reverse direction, a mechanism is incorporated that transmits the rotation of the motor to the cam after half a rotation of the rotating member, and the driven object is operated by rotating in the opposite direction. The switch is set to change from Therefore, not only when the motor rotates in the normal direction, but also when the motor rotates in the reverse direction, the driven object can be operated in the same way as when the motor rotates in the normal direction. [Example] First, FIGS. 1 and 2 show the overall configuration of a motor actuator 1 of the present invention. This motor actuator 1 is assembled inside a split-shaped case 2 and a case cover 3. The motor 4 as a rotational drive source is, for example, an AC motor that can rotate in reverse, and is attached to the side of the case cover 3, and its motor shaft 5
The motor gear 6 is exposed inside the case 2. This motor gear 6 is sequentially meshed with gears 7 and 8 for compound reduction, and a first gear consisting of gears.
The rotational force is transmitted to the rotating member 9 of. These gears 7, 8 and first rotating member 9 are fixed to case 2 and rotatably supported by shafts 10, 11, 12 supported by case cover 3. Further, the first rotating member 9 meshes with a second rotating member 13 made of a gear at a gear ratio of 1:1. Therefore, although the first rotating member 9 and the second rotating member 13 rotate in different directions, they always rotate in the same phase. The second rotating member 13 is
The cage is rotatably supported between the case 2 and the case cover 3 by its own shaft 14, and has a first cam member 15 integrally formed on one side. The first cam member 15 of this embodiment is configured as an end cam, as shown in FIGS. 1 and 2, and also shown in FIGS. Cam surfaces 16a and 16b with the same inclination and different orientations are formed symmetrically with the position P ₁ and the high second position P ₂ as boundaries, that is, in intervals of approximately 180 degrees of central angle, and the intermediate pin 17
is in contact with The intermediate pin 17 is supported so as to be slidable in the axial direction inside a guide tube 18 formed in the case 2, and when it is in contact with the first position P ₁ , the intermediate pin 17 is attached to the buttful 32 as an example of a driven object. Let be a blockage state,
Conversely, when it is in contact with the second position P ₂ ,
The buttful 32, which is an example of a driven object, is placed in an open state. The buttful 32 is rotatably supported by a support shaft 35 with respect to the member forming the opening 33, and is always urged in the direction of closing the opening 33 by a spring 34. ing. Further, the shaft 12 rotatably supports a third rotating member 19. As shown in FIGS. 5 and 6, the third rotating member 19 in this embodiment has an engaging portion 21 formed by a projection on one side surface, and a second engaging portion 21 formed on its outer peripheral surface. Cam member 20
A low portion 22a, a high portion 22c, and inclined portions 22b and 22d connecting the ends of these portions are integrally formed. As shown in FIGS. 7 and 8, the engagement portion 21 corresponds to a forward rotation side engagement portion 23a and a reverse rotation side engagement portion 23b formed on the side surface of the first rotating member 9. ing. Therefore, when the engaging portion 21 is engaged with either of the engaging portions 23a, 23b, the first rotating member 9 and the third rotating member 19 rotate together, but they rotate half a rotation. When there is no abutting relationship in the section, even if the first rotating member 9 rotates, the third rotating member 19 does not rotate and remains stationary. A switch lever 24 is rotatably supported inside the case 2 by its support shaft 25.
A permanent magnet 27 at the tip corresponds to a switch 28 such as a reed switch, and a contact surface 26 on the back side connects the lower part 22a and the inclined part 22.
b, is in a state where it can touch the high part 22c and the slope part 22d. As shown in FIG. 13, the switch 28 is inserted into the recess of the case 2, the case cover 3 is placed over the top of the case 2, and then the printed circuit board 39 is applied and soldered. It is fixed to a printed circuit board 39. This printed circuit board 39 is attached to the case cover 3 on the opening surface of the case 2.
It is also fixed with a screw or the like, and is also used as a relay for the lead wire 40 of the switch 28. The switch lever 24 is always moved away from the switch 28 by a leaf spring 29 built into the case 2, that is, the contact piece 2
is biased in a direction that contacts the outer periphery of the second cam member 20. Next, FIG. 9 shows a control circuit 30 for the motor 4. As shown in FIG. This control circuit 30 controls the on/off state of the motor 4 using the on/off signal from the switch 28 as well as the signal from the temperature sensor 31 as input conditions. Temperature sensor 31 detects the internal temperature of the refrigerator and sends the temperature information to control circuit 30. Further, the on/off signal of the switch 28 is input to the control circuit 30 via a fall detection circuit 36 or a rise detection circuit 37 and a delay circuit 38. First, the operation of the control circuit 30 will be explained. When the temperature inside the refrigerator is higher than the target temperature and the baffle 32 is closed, the control circuit 30 starts the motor 4 and moves the buffle 32 in the opening direction (operation mode A). Further, when the internal temperature of the refrigerator is higher than the target temperature and the buffer 32 is in an open state, the control circuit 30 sends cold air into the refrigerator by continuing this state (operation mode B). The temperature inside the refrigerator is lower than the target temperature, and the temperature is full 3.
2 is open, the control circuit 30 determines that cold air is not needed and moves the buffle 32 in the closing direction (operation mode C). Further, when the temperature inside the refrigerator is lower than the target temperature and the buffer 32 is closed, the control circuit 30 continues this state as not requiring cold air (operation mode D). Such operating conditions include operating modes A, B, C,
The table below shows the on/off state of the switch 28 for each D.

[Effect of idea]

The present invention has the following unique effects. Not only when the motor rotates in the forward rotation direction, but even when the motor rotates in the reverse direction, the first cam member obtains the same rotational motion as when it rotates in the forward direction, so the rotation direction of the motor also Regardless of the situation, the driven target can be operated without malfunction. When the motor rotates in reverse, after the first rotating member has rotated approximately half a rotation, the rotation of the first rotating member changes to the third rotating member and the second rotating member due to the engagement relationship of the engaging portions.
Since the signal is transmitted to the cam member, the switch lever or switch is reliably switched after the operation of the driven object in the same way as when the motor rotates in the normal direction. Due to the existence of such functionality, no reversing mechanism is required in the motor, and the rotary drive source is therefore replaced by an inexpensive motor.

[Brief explanation of drawings]

Fig. 1 is a bottom view showing the motor actuator of the present invention with the case cover removed, Fig. 2 is a sectional view taken along the meshing line of the gears, Fig. 3 is a plan view of the first cam member, Figure 4 is a cross-sectional view of the cam curve and the buttful portion of the driven object, and Figure 5 is the cross-sectional view of the third
FIG. 6 is a plan view of the rotating member, FIG. 6 is a sectional view thereof, and FIG.
Figure 8 is a plan view of the first rotating member, Figure 8 is its sectional view, Figure 9 is a block diagram of the control circuit, Figure 10A is a time chart during normal rotation of the motor, and Figure 10 is a diagram of the control circuit. 11 and 12 are plan views showing the relative positional relationship between the rotating member and the cam member, and FIG. 13 is a sectional view of the switch mounting portion. 1...Motor actuator, 4...Motor,
9...first rotating member, 13...second rotating member, 15...first cam member, 16a, 16b...
...Cam surface, 17... Intermediate pin, 19... Third rotating member, 20... Second cam member, 21... Engaging portion, 22a... Low portion, 22b... Inclined portion, 22c
...Tall part, 22d...Slope part, 23a, 23b...
...Engagement portion, 24...Switch lever, 28...Switch, 30...Control circuit, 32...Bumpful as an example of a driven object, 36...Fall detection circuit, 37...Rise detection circuit, 38... ...Delay circuit.

Claims (1)

[Scope of utility model registration request] A motor 4 that can rotate in reverse; a first rotating member 9 and a second rotating member 13 that rotate in the same phase in response to the output rotation of the motor 4;
A third rotary member 19 that can be interlocked with the rotation of the first rotary member 9, and a cam surface 1 that rotates integrally with the second rotary member 13 and has a different direction for each approximately 180 degree central angle section.
The first cam member 15 that moves the driven object by 6a, 16b, the forward rotation side engagement portion 23a provided on either one of the first rotation member 9 and the third rotation member 19, and the reverse rotation side engagement portion 23a. An engaging portion 23b;
Engagement portion 23 provided on the other of the first rotating member 9 and the third rotating member 19 on the forward rotation side and reverse rotation side
an engaging portion 21 that engages only in a half-rotation section with respect to a and 23b, and a low portion 22a that rotates integrally with the third rotating member 19 and is formed at approximately every 180 degrees of central angle;
High portion 22c and sloped portion 2 that smoothly connects these parts
A motor actuator 1 comprising a second cam member 20 that drives a switch lever 24 at 2b and 22d to turn a switch 28 on and off.