JPH0316190Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a periodic operation switching mechanism for a timer used in a controlled device such as a microwave oven.

BACKGROUND ART Conventionally, various structures have been known as periodic operation switching mechanisms for timers applied to, for example, microwave ovens. One such method is to have a periodic operation switch built into the timer body, a camshaft for externally operating the switch protruding from the back of the timer, and a lever fixed to the camshaft. In addition, the timer body of this mechanism is fixed to a mounting bracket, and a switching mechanism is placed at an appropriate position on this mounting bracket to switch the switching knob shaft for the periodic operation switch, and this switching mechanism and the aforementioned lever are connected to each other. are connected by a slide lever, and the lever is remotely operated by a switching knob shaft.

Furthermore, another mechanism having the following structure is also known. That is, the timer body of this mechanism has a built-in periodic operation cam, and the switch lever follows this cam.
A part of this switch lever is made to protrude to the outside of the timer to operate a periodic operation switch attached to the outside of the timer. Note that an actuator lever is attached to this periodic operation switch. Further, the timer main body is fixed to a mounting bracket, and a switching knob shaft and a switching mechanism for a periodic operation switch are arranged at an appropriate position on this mounting bracket, and this switching mechanism and the actuator lever are connected to each other. It is connected via a slide lever and has a switching knob shaft.
The actuator lever is controlled remotely.

However, the periodic operation switching mechanism of the timer configured as described above has the following drawbacks.

For example, in the former structure, the slide lever is placed on the back of the timer, so when this mechanism is incorporated into a microwave oven, the internal wiring of this microwave oven is often placed near the slide lever. However, if the slide lever comes into contact with internal wiring, the operation of the slide lever is inhibited. In addition, since both structures are slide levers, the longer the lever is, the more the lever will bend and the error will become larger. Therefore, if you want to change the periodic operation switch to multiple stages (the periodic operation switch is used for the output adjustment device of the microwave oven) (There are 2-stage switching, 5-stage switching, 7-stage switching, and stepless switching, etc.), but the disadvantage is that accurate remote control switching is difficult.

Purpose of the invention Therefore, the purpose of the present invention was made in view of the above-mentioned shortcomings.The purpose of the present invention was to locate the remote control transmission mechanism in a position away from the internal wiring of the controlled device such as a microwave oven, and to To provide a periodic operation switching mechanism for a timer that can accurately transmit movement to a periodic operation switch mechanism.

Summary of the invention Therefore, the present invention includes an output shaft for periodic operation switching that protrudes from inside the timer case, and an output shaft that is attached to the mounting bracket, in a space formed by a mounting bracket for mounting a controlled device, and a timer. The structure includes a rotation transmission mechanism that connects the control shaft to the operating shaft for switching the periodic operation. In this way, since the transmission mechanism is placed in the space formed by the mounting bracket and the timer, even if the switching mechanism is incorporated into a controlled device such as a microwave oven, the transmission mechanism will come into contact with the internal wiring of the controlled device. Such things can be prevented, and malfunctions of remote control can be prevented.
In addition, since the mechanism that connects the output shaft for periodic operation switching and the operation shaft for periodic operation switching is a rotation transmission mechanism, the position setting of the operation axis for periodic operation switching can be accurately transmitted to the output shaft side. , Therefore, multi-step switching transmission can be performed accurately.

Configuration of Embodiment Hereinafter, details of the present invention will be explained using an embodiment shown in the drawings.

1 to 3 show a periodic operation switching mechanism 1 for a timer according to the present invention. The periodic operation switching mechanism 1 is provided with a mounting bracket 2 on its upper side for attachment to a controlled device (not shown) such as a microwave oven. An operating shaft 3 for periodic operation switching is rotatably attached to the mounting bracket 2, and the lower end 3a of the operating shaft 3 is rotatably supported by a receiving plate 4 that is a part of the mounting bracket 2. The bearing is mounted on the shaft. Further, a switching gear 5 is fixed to a portion of the operating shaft 3 between the mounting bracket 2 and the receiving plate 4, and below the switching gear 5, a positioning cam 6 and a perpendicular cam 7 are installed. Fixed. This positioning cam 6 has a switching stage number, for example, 2 stages, 5 stages,
It is formed into a cam shape that corresponds to seven stages and is stepless, and is fixed at each position by the pressing action of a leaf spring (not shown). Further, the perpendicular cam 7 corresponds to a perpendicular perforator (not shown) provided on the receiving plate 4, thereby regulating the angle at which the operating shaft 3 can rotate.

Further, the switching gear 5 meshes with a gear 10 of an output shaft 9 for periodic operation switching via an idle gear 8. As shown in detail in FIG. 2, the idle gear 8 is rotatably held on a support shaft 13 attached between the mounting bracket 2 and the timer case 12 of the timer body 11. As shown in FIG. 1, the switching gear 5 and the gear 10 of the periodic operation switching output shaft 9 are always in a meshing relationship. Furthermore, the periodic operation switching output shaft 9
The gear 10 portion is projected upward from the timer case 12, so the gear 10 is
It is arranged in a space 14 formed by the mounting bracket 2 and the timer case 12. Further, a flange portion 15 is formed at an approximately intermediate position in the axial direction of the periodic operation switching output shaft 9, and a pair of protruding cams 16 are provided on the lower surface side of the flange portion 15 on the diametrical line. It is being Furthermore, as shown in FIG. 3, one external operation cam part 17 is provided on the peripheral surface of the flange part 15.

On the other hand, as shown in detail in FIG. 2, a periodic operation cam member 18 is rotatably supported on a portion of the periodic operation switching output shaft 9 below the flange portion 15. A cam 19 is provided on the upper surface side of the periodic operation cam member 18 and protrudes upward by a predetermined amount in correspondence with the protruding cam 16 provided on the lower surface side of the flange portion 15 of the periodic operation switching output shaft 9. ing. The cam 19 has gentle slopes on both sides, and is formed such that the center portion is the most protruding portion upward.
Further, the periodic operation cam member 18 is always pushed upward by the elastic force of a coil spring 21 disposed between the periodic operation cam member 18 and the receiving plate 20 located on the lower end side of the output shaft 9 for periodic operation switching. It is configured to be pressed and biased. When the cam 16 on the flange portion 15 side and the cam 19 on the periodic cam member 18 side face each other, the periodic cam member 18 resists the elastic biasing force of the coil spring 21.
It is guided by the periodic operation switching output shaft 9 and is pressed downward. Further, on the outer peripheral surface side of the periodic operation cam member 18, a contact surface portion 22 with which one end portion 24a of the switch lever 24 abuts and engages is formed on the upper side, and a gear portion 23 is formed on the lower side thereof. There is. Further, the other end 24b of the switch lever 24 is in constant contact with a switch push button 25a of the switch 25. That is, this switch lever 24 is
As shown in detail in the figure, the timer case 12 is rotatably supported by a support shaft 26 that is fixed upright, and its shape when viewed from the top is approximately "H" shaped. The one end 24a abuts and engages with the stepped contact surface 22 of the periodic action cam member 18, and the other end 24b abuts and engages the switch push button 25a of the switch 25. . Now, FIG. 3 shows one end 2 of the switch lever 24.
4a is abuttingly engaged with the abutting surface portion 22 of the periodic movement cam member 18, so that the switch lever 24
The other end 24b is in a state where a switch push button 25a of the switch 25 is pushed into the switch case 25b. On the other hand, the cam 16 provided on the flange portion 15 of the periodic operation switching output shaft 9 and the cam 19 of the periodic operation cam member 18 abut and engage,
When the periodic cam member 18 is pushed downward in FIG.
2 is disengaged. Therefore, the other end 24b of the switch lever 24 is connected to the switch push button 25.
Due to the elastic force of a spring (not shown) that constantly presses and biases a in the projecting direction, it is pushed to the right in FIG. 3, and as a result, it rotates clockwise (in the direction of arrow A). Further, the external operation cam portion 17 provided on the circumferential surface side of the flange portion 15 of the output shaft 9 for periodic operation switching is connected to one end portion 24a of the switch lever 24.
In the engaged state, the switch lever 24 is always pushed outward, so that the other end 24b of the switch lever 24 pushes the switch push button 25a of the switch 25 against the force of the spring. It is in a state where it is pushed into the switch case 25b. Therefore, in this case, the switch 25 can be continuously turned on regardless of the rotation of the periodic cam member 18.

On the other hand, the gear portion 23 of the periodic cam member 18
A timer gear train 27 is always in mesh with the timer gear train 27.
The driving force from the driving source is transmitted to the periodic cam member 18 via the timer gear train 27 and the like. Further, as shown in FIG. 3, a cam 28 is provided on the upper surface side of the periodic cam member 18
The curved surface 28a of the cam 28 pushes the one end 24a of the switch lever 24 that has come off the contact surface 22 of the periodic cam member 18 outward again, as shown in FIGS. 2 and 3. It is now set to the position. Note that in FIG. 1, reference numeral 29 indicates a timer axis.

Effects of the Embodiment Next, the effects of the timer periodic operation switching mechanism 1 configured as described above will be explained.

First, the operating shaft 3 for periodic operation switching is rotated. Then, the rotation is transmitted to the gear 10 of the periodic operation switching output shaft 9 via the idle gear 8,
A cam 16 provided on the flange portion 15 of the periodic operation switching output shaft 9 is set at a predetermined position. Thereafter, the drive source for driving the timer gear train 27 and the like is turned on, and the periodic cam member 18 is rotated clockwise via the timer gear train 27 and the like. In this state, the periodic operation cam member 18 is urged toward the flange portion 15 of the periodic operation switching output shaft 9, that is, upward, by the elastic force of the coil spring 21. Therefore, the flange portion 15
When the cam 19 of the periodic movement cam member 18 coincides with the position of the cam 16, this periodic movement cam member 18
is pushed downward against the elastic force of the coil spring 21. By the way, one end 24a of the switch lever 24 is pressed against the contact surface 22 of the periodic cam member 18 by the return force of the spring of the switch push button 25a. However, as described above, when the periodic cam member 18 moves downward, this causes the switch lever 2 to move downward.
The one end 24a of the switch 4 comes off the contact surface 22, and due to the return force of the switch push button 25a, the third
In the figure, it moves clockwise, that is, toward the center of the periodic operation switching output shaft 9, thereby releasing the pressing of the switch push button 25a by the other end 24b of the switch lever 24. So, switch 2
5 is in an off or on state.

Next, when the periodic operation cam member 18 continues to rotate, the engagement between the cam 16 on the periodic operation switching output shaft 9 side and the cam 19 of the periodic operation cam member 18 is released, but the one end 24a of the switch lever 24 teeth,
The switch lever 24 remains inserted in the center direction of the output shaft 9 for periodic operation switching, and when the switch lever 24 continues to rotate, one end 24a of the switch lever 24 touches the curved surface of the cam 28 provided on the upper surface side of the periodic operation cam member 18. 28a in a counterclockwise direction, ie, outwardly of the periodic cam member 18. As a result, the periodic cam member 18 is rotated by the coil spring 21.
The switch lever 24 returns to its initial position again due to the elastic force, and the one end 24a of the switch lever 24 engages with the contact surface 22. Therefore, the switch lever 24
The other end 24b again pushes the switch push button 25a into the switch case 25b against the force of the spring, thereby setting the switch 25 in the on or off state.

In addition, the cam 16 of the output shaft 9 for periodic operation switching
is moved by setting the rotational phase position of the periodic operation switching output shaft 9, so the position that matches the cam 19 of the periodic operation cam member 18, that is, the position where the switch lever 24 is reversed, is the position of the periodic operation switching output shaft 9. It can be set arbitrarily by turning 9. Further, the position at which the periodic movement cam member 18 returns is always constant because the position of the curved surface portion 28a of the cam 28 of the periodic movement cam member 18 is constant. As described above, the operating position of the switch 25 is constant, and the reversal position can be set arbitrarily.
As a result, the duration of on or off of the switch 25 can be changed during one rotation of the periodic cam member 18.

Note that when the external operation cam portion 17 of the periodic operation switching output shaft 9 is engaged with one end portion 24a of the switch lever 24, the switch lever 24 is forced into the state shown in FIG. Therefore, it is possible to maintain continuous operation regardless of the rotation of the periodic operation cam member 18.

The above is an explanation of the operation of the variable timer of the periodic operation switch section. For example, in the case of a defrosting timer in a microwave oven, the operating position and the reverse position of the switch 25 are controlled by the curved surfaces 28a and 28b of the periodic operation cam member 18. will be determined. In this case, each cam 16 of the periodic operation switching output shaft 9 and the periodic operation cam member 18,
19, the contact surface portion 22, and the coil spring 21 are no longer necessary.

Next, an application example where the above periodic operation switching mechanism is used in a microwave oven will be described. The switch 25 is used as an output adjustment device for a microwave oven, and its output adjustment has two stages (intermittent and continuous), five stages (intermittent 1 to 4, continuous), and seven stages (intermittent 1 to 6, continuous). , and stepless (intermittent to continuous)
There are examples.

For example, if you want to switch from intermittent to continuous mode with a two-stage switching mechanism, use the operating shaft 3 for periodic operation switching.
Rotate clockwise by a predetermined angle. Then, the rotation is transmitted to the gear 10 of the periodic operation switching output shaft 9 via the idle gear 8, and the external operation cam portion 17 of the periodic operation switching output shaft 9 touches one end 24a of the switch lever 24. In FIG. 3, the other end 24b is pushed counterclockwise.
presses the switch push button 25a, turning the switch 25 on. In this state, the switch 25 remains on continuously regardless of the movement of the periodic cam member 18. If you want to switch to the opposite direction, rotate the operating shaft 3 counterclockwise until the degree cam 7 comes into contact with the degree. Then, the engagement between the external operation cam part 17 and the switch lever 24 is released, and the switch lever 24 is moved to the periodic operation cam member 18.
This movement causes the switch 25 to be turned on and off.

Next, in the five-stage switching mechanism, from intermittent 1 to
When it is desired to switch to intermittent operation 3, the operation shaft 3 is rotated by a predetermined angle, and the periodic operation switching output shaft 9 is rotated accordingly. Here, the periodic operation switching output shaft 9, the switch 25, the switch lever 24, the periodic operation cam member 18, and the coil spring 21 are turned on,
It constitutes a periodic operation switch that varies the off ratio. Therefore, by rotating the operating shaft 3, the switch 25 is switched from the intermittent state 1 to the intermittent state 3. Furthermore, if it is desired to switch to a continuous ON state, the operating shaft 3 is rotated clockwise until the percussion cam 7 abuts on a predetermined perforation. Then, as in the case of two-stage switching, the operation shaft 3 → idle gear 8 → output shaft 9 for periodic operation switching → cam part 17 for external operation → switch lever 24
→The switches 25 are turned on continuously in the order of the switches 25. In addition, there are 7 stages, and 5 for no stages.
This is the same operation as step switching.

In this embodiment, the operation axis 3 for periodic operation switching is
and the output shaft 9 for periodic operation switching on the timer main body 11 side.
Since only the idle gear 8 is interposed between the idle gear 8 and the idle gear 8, for example, if you want to change the position of the operating shaft 3 due to a design change of the microwave oven, you can easily change the design by appropriately selecting the number of teeth of the idle gear 8. can.

Other Embodiments In the above-mentioned embodiments, a gear mechanism was used to accurately transmit rotation, but the configuration is not limited to this, and there is a thread hook using a pulley, a rubber A transmission drive mechanism using a stainless steel belt or a stainless steel belt can also be used instead. Alternatively, a transmission mechanism using a rack and pinion may be used.

Effects of the Invention As explained above, according to the periodic operation switching mechanism for a timer according to the present invention, the transmission mechanism that connects the periodic operation switching operation shaft and the periodic operation switching output shaft can be connected to the transmission mechanism for attaching the controlled device. Because it is arranged in the space between the mounting bracket and the timer,
For example, even if this switching mechanism is incorporated into a microwave oven, it is possible to reliably prevent the transmission mechanism from coming into contact with the internal wiring of the microwave oven. Therefore,
It is possible to eliminate the conventional problem of malfunction of the transmission mechanism due to contact with internal wiring.

In addition, since the operating shaft and the periodic operation switching output shaft are connected by a rotation transmission mechanism,
Compared to the conventional slide lever method, the position setting of the operating shaft can be transmitted to the output shaft more accurately. Therefore,
Multi-step remote control switching can now be performed accurately.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a timer equipped with a periodic operation switching mechanism according to the present invention, FIG. 2 is an enlarged sectional view of the timer, and FIG. 3 is a partially plan view of the timer. DESCRIPTION OF SYMBOLS 1...Timer periodic operation switching mechanism, 2...Mounting bracket, 3...Operation shaft, 9...Output shaft for periodic operation switching, 12...Timer case, 14...
space, 16... cam, 17... cam section for external operation, 18... periodic operation cam member, 19... cam,
21... Coil spring, 22... Contact surface portion, 23...
...Gear part, 24...Switch lever, 25...Switch, 28...Cam.

Claims (1)

[Scope of utility model registration request] An operating shaft for periodic operation switching is attached to a mounting bracket for attachment to a controlled device, and a timer having a periodic operation switching function is attached to the mounting bracket at a predetermined distance, and the timer is formed by the mounting bracket and the timer. A periodic operation switching mechanism for a timer, characterized in that an output shaft for periodic operation switching protrudes from within a timer case into a space, and the output shaft and the operating shaft are connected by a rotation transmission mechanism.