JP2001357752A - Multistage cam switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage cam switch wherein generation of surge can be surely prevented when a contact point between mutual terminals is cut off, and wherein a rotational drive unit on which this is mounted can be stably actuated thereby. SOLUTION: The cam switch has a cam plate 1 which is mounted on a rotating shaft 12 and at whose circumferential part a large diameter part and a small diameter part are installed, and plural elastic terminals 2, 3, 4 that have been installed at the circumference of the cam plate 1 so as to abut on the large diameter part and the small diameter part accompanied by the rotation of the rotating shaft. The terminals 2, 3, 4 are successively installed in the diameter direction of the cam plate 1 so that mutual contact points 9a to 9d can be freely connected and separated, and mutual contact points are abutted by being pressed to the terminal side which is outwardly adjacent at the large diameter part of the cam plate 1, and contact points are separated from an outwardly adjacent terminal by abutting on the small diameter part at the small diameter part by the elasticity, and mutual contact points are cut off. In this multistage cam switch, plural cam regions 7, 8 are formed toward a shaft line direction at the circumference of the cam plate 1, and the large diameter parts 7a, 8a and the small diameter parts 7b, 8b are formed at respective cam regions, and respective terminals 2, 3 are engaged with respective cam regions 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage cam switch provided on an output shaft of a rotary drive device such as a motor for controlling the start and stop of the drive device.

[0002]

2. Description of the Related Art In general, louvers, louvers, and the like are used in air conditioners, washing machines, electric flushing mechanisms for flush toilets, and the like.
A motor with a built-in reduction gear train for opening and closing various driven parts such as a drain valve and a brake belt is incorporated. When it is necessary to switch the degree of opening of the motor between two or multiple stages as in the case of the louver, for example, the rotation angle of the rotating shaft of the motor can be switched and adjusted in multiple stages. A motor incorporating a multi-stage cam switch is used.

FIG. 3 and FIG.
FIG. 1 shows a multi-stage cam switch in a conventional motor of this type, which has been previously proposed as 163892. FIG.
As shown in FIG. 1, this multi-stage cam switch 10 is provided on an output shaft (rotating shaft) 12 which is driven to rotate in the direction of an arrow by a motor 11 via a reduction gear train. A switching means 14 is provided between the switch and the multi-stage cam switch 10.

The multi-stage cam switch 10 includes a rotating shaft 12
A substantially disc-shaped cam plate 15 rotatably mounted integrally with the cam plate 15, and a first disc plate disposed on the outer periphery of the cam plate 15 in a state of being sequentially superposed in the radial direction of the cam plate 15.
Of the cam plate 15, a first concave portion 15 a which is concave in a radial direction, and a second concave portion 15 b which is deeper than the first concave portion 15 a. Are sequentially formed.

Here, these first to third terminals 16, 1
Each of the first and second terminals 7 and 18 is formed of a leaf spring, and is urged toward the outer periphery of the cam plate 15 and has a second terminal provided outside the first terminal 16 whose tip is swingable. Terminal 17 is swingably provided, and the second terminal 17
The third terminal 18 is fixedly attached to the outside. The second terminal 17 is used as a common terminal, and the first and third terminals 16 and 18 are selectively connected by the changeover switch 19 of the changeover means 14, respectively.

The first terminal 16 is located on the outer periphery of the cam plate 15 between the first terminal 16 and the second terminal 17 and between the second terminal 17 and the third terminal 18. In this case, contact points 20 and 21 are formed which are in contact with each other. Further, the first terminal 16 is engaged with the concave portion 13b of the cam plate 15 at the tip end of the second terminal 17 so that the cam plate 1
When displaced to the fifth side, a stopper 22 for cutting off the contact point 20 is provided by locking the distal end of the second terminal 17 to prevent the first terminal 17 from following. I have.

In the conventional multi-stage cam switch 10 having the above-described configuration, for example, when the opening of the louver is set small, as shown in FIG. Connect to terminal 18. As a result, electric power is supplied to the motor 11, and the output shaft 12 and the cam plate 15 rotate in the direction of the arrow in the figure, and the first recess 15a engages with the first terminal 16 as shown in FIG. Part 16a
Is rotated to the first terminal 1 by the urging force of the leaf spring.
6 and the second terminal 17 are displaced toward the center of the cam plate 15. Thereby, the contact point 21 between the second terminal 17 and the third terminal 18 is disconnected, and the motor 11 stops.

When setting the opening of the louver large, the changeover switch 19 of the changeover means 14 is connected to the first terminal 16 as shown in FIG. As a result, similarly, electric power is supplied to the motor 11, and the output shaft 12 and the cam plate 15 rotate in the direction of the arrow in FIG.
As shown in (b), the first concave portion 15a is connected to the first terminal 16.
Since the first terminal 16 and the second terminal 17 are both displaced toward the center of the cam plate 15 when reaching the engagement portion 16a of
The rotation of the motor 11 is continued without disconnecting the contact 20.

When the motor 11 rotates and the engaging portion 16a of the first terminal 16 engages with the second concave portion 15b of the cam plate 15, the first terminal 16 further moves toward the center of the cam plate 15. While the second terminal 17 is displaced, the distal end of the second terminal 17 is locked by the stopper 22, so that the displacement is prevented. As a result, the contact point 20 between the first terminal 16 and the second terminal 17 is disconnected, and the motor 11 stops. As described above, according to the multi-stage cam switch 10 having the above configuration, there is an advantage that the rotation angle of the rotating shaft can be adjusted in multiple stages with a simple structure.

[0010]

Incidentally, in the conventional multistage cam switch 10, the circuit is formed through a contact 20 between the first terminal 16 and the second terminal 17 shown in FIG. Is formed, when the engaging portion 16a of the first terminal 16 falls into the first concave portion 15a,
First, after the first terminal 16 is displaced toward the center of the cam plate 15 and the first terminal 16 starts displacing, the second terminal 17 is moved to the first terminal 16 side with a very short time. Therefore, after the contact 20 is disconnected once, the contact 20 is connected again. in addition,
Since the first terminal 16 and the second terminal 17 are not provided so as to be swingable coaxially, sliding occurs between the two at the terminal 20.

As a result, instantaneous chattering occurs at the contact 20 between the first and second terminals 16 and 17, and
A surge phenomenon occurs due to a high pulse voltage of several thousand volts. As a result, there is a concern that the motor 11 will be adversely affected, and therefore, measures have been desired.

The present invention has been made in view of the above circumstances, and it is possible to reliably prevent the occurrence of a surge phenomenon when a contact between terminals is cut off, thereby stabilizing a rotation drive device to which the terminal is attached. It is an object of the present invention to provide a multi-stage cam switch that can be operated in a controlled manner.

[0013]

According to a first aspect of the present invention, there is provided a cam plate having a large-diameter portion and a small-diameter portion formed on an outer peripheral portion thereof, the cam plate being attached to a rotary shaft, and the rotating plate being provided on an outer periphery of the cam plate. A plurality of elastic terminals provided so as to come into contact with the large-diameter portion or the small-diameter portion as the shaft rotates, and the terminals are provided with a cam plate so that the contact points thereof can freely contact and separate from each other. Are sequentially provided in the radial direction of the cam plate, and when the large-diameter portion of the cam plate is pressed to the terminal side adjacent to the outside, the contacts come into contact with each other, and the small-diameter portion contacts the small-diameter portion by the elasticity. In a multistage cam switch in which a contact is cut away from an externally adjacent terminal, a plurality of cam regions are formed on an outer periphery of the cam plate in an axial direction, and the large diameter portion is formed in each cam region. And forming a small diameter part To, in each of the cam area, is characterized in that each said pin is engaged.

According to a second aspect of the present invention, in the first aspect, first to third terminals formed by leaf springs are sequentially provided in the radial direction of the cam plate. The third terminal is fixed, and the cam plate has a small-diameter cam region with which the first terminal abuts;
The large-diameter cam region with which the second terminal comes into contact is integrally formed.

According to the multi-stage cam switch according to the first or second aspect, in the multi-stage cam switch having a plurality of terminals, a plurality of cam regions are formed on the outer periphery of the cam plate, each terminal abutting in the axial direction. In addition, since a large diameter portion and a small diameter portion with which each terminal engages are formed in each cam area, the terminals adjacent in the radial direction of the cam plate are connected together in a state where the contacts are connected to each other. It does not fall to the cam plate side, and thus the occurrence of the above-described surge phenomenon can be reliably prevented.

That is, the tips of the small-diameter portions in the plurality of cam regions formed on the cam plate are moved from the cam region corresponding to the terminal located inside the cam plate (hereinafter referred to as the inside terminal) to the above-mentioned position. Toward a cam area corresponding to a terminal adjacent to the outside of the inner terminal (hereinafter, referred to as an outer terminal),
It is formed so as to be sequentially located on the rear side in the rotation direction of the rotation shaft. As a result, when the rotation shaft rotates and the inner terminal first moves to the small diameter portion of the corresponding cam area and is displaced inward of the cam plate, the outer terminal is moved to the corresponding cam. Since the inner terminal is engaged with the large-diameter portion, only the inner terminal falls to the small-diameter portion, and the mutual contact is disconnected.

For example, as in the invention described in claim 2,
In the case of three terminals formed by a leaf spring, the first terminal first falls to the small diameter portion formed in the small diameter cam area with the rotation of the rotating shaft. At this time,
Since the second terminal is in contact with the large-diameter portion of the large-diameter cam region, only the first terminal is displaced inward of the cam plate, and the contact between the first and second terminals is disconnected. . Next, when the rotating shaft further rotates and the second terminal falls to the small-diameter portion of the large-diameter cam area, the third terminal is fixed, so that only the second terminal is inward of the cam plate. And the contact between the second and third terminals is disconnected.

[0018]

1 and 2 show an embodiment of a multi-stage cam switch according to the present invention. Other components such as switching means are the same as those shown in FIGS. 3 and 4. Therefore, the same reference numerals are given below to simplify the description. As shown in FIGS. 1 and 2, the multi-stage cam switch includes a cam plate 1 attached to an output shaft (rotary shaft) 12 of a motor 11 so as to rotate integrally therewith, and a radially outer portion of the cam plate 1. Three of the first to the first
The cam plate 1 is roughly constituted by third terminals 2, 3, and 4. The cam plate 1 further includes a substantially disk-shaped first-stage cam 5,
The second stage cam 6 having a larger diameter than this is formed coaxially and integrally.

The outer peripheral surface of the first stage cam 5 of the cam plate 1 is formed in a small-diameter cam region 7 where the first terminal 2 contacts.
The outer peripheral surface of the second-stage cam 6 is a large-diameter cam region 8 with which the second terminal 3 contacts. These first stage cams 5
The outer peripheral surface of the second stage cam 6 has a large diameter portion 7.
a, 8a and concave portions (small diameter portions) 7b, 8b
Are formed. Here, the distal end of the concave portion 8b of the second stage cam 6 is formed so as to be located behind the distal end of the concave portion 7b of the first stage cam 5 in the rotation direction of the rotating shaft.

On the other hand, the first to third terminals 2, 3, and 4 are each formed by a leaf spring, and the outermost third terminal 4 is fixed, and the first and third terminals 2, 3, and 4 are fixed. The two terminals 2 and 3 are provided so that the tip portions can swing freely. The first terminal 2 is formed to have substantially the same width as the first-stage cam 5, and the first terminal 2 is provided so as to be urged so that the engagement protrusion 2 a contacts the small-diameter cam region 7 of the first-stage cam 5. Have been. The second terminal 3 is formed to have a width that spans between the first terminal 2 and the second-stage cam 6, and the engagement protrusion 3 a is provided in the large-diameter cam region 8 of the second-stage cam 6. It is provided to be urged to abut.

At the leading end of the first terminal 2 and the second terminal 3, the engagement projection 2 a of the first terminal 2 is in contact with the large-diameter portion 7 a of the small-diameter cam region 7. Abut each other at
Contact points 9a and 9b are provided which are separated by the elasticity of the first terminal 2 when engaged with the concave portion 7b. In addition, at the tip of the second terminal 3 and the third terminal 4, the engagement protrusion 3 a of the second terminal 3 is in contact with the large-diameter portion 8 a of the large-diameter cam region 8. Abuts and engages with the concave portion 8b so that the second
Contacts 9c and 9d separated by the elasticity of the terminal 3 are provided.

The first to third terminals 2, 3, 4
Also, as in the case shown in FIGS. 3 and 4, the second terminal 3 is used as a common terminal, and the first terminal 2 and the third terminal 4 are connected by the changeover switch 19 of the changeover means 14, respectively. It is selectively connected.

Next, the operation of the multi-stage cam switch having the above configuration will be described. First, as in the case shown in FIG. 3, when setting the opening of the louver small, for example, the changeover switch 1 of the switching means 14 shown in FIG.
9 is connected to the third terminal 4 side shown in FIG. As a result, electric power is supplied to the motor 11 and the output shaft 12 and the cam plate 1 rotate in the direction of the arrow in the figure, and the engaging portion 2a of the first terminal 2 is moved to the small-diameter cam region 7 as shown in FIG. The first terminal 2 is displaced toward the center of the cam plate 1 by the biasing force of the leaf spring when the first terminal 2 falls from the large diameter portion 7a to the concave portion 7b. At this time, since the engaging portion 3a of the second terminal 3 is in contact with the large-diameter portion 8a of the large-diameter cam region 8, the first terminal 2
However, only the contacts 9a and 9b are disconnected, but the motor 11 continues to rotate as no circuit is formed between the contacts 9a and 9b.

When the motor 11 further rotates and the engaging portion 3a of the second terminal 3 engages with the concave portion 8b of the large-diameter cam area 8, the second terminal 3 is moved toward the center of the cam plate 1. While the third terminal 4 is fixed while being displaced,
The second terminal 3 is separated from the third terminal 4, the contacts 9 c and 9 d therebetween are cut, and the motor 11 stops.

Next, when setting the opening of the louver large, as shown in FIG.
Is connected to the first terminal 2 shown in FIG. As a result, similarly, electric power is supplied to the motor 11 and the output shaft 12 and the cam plate 1 rotate in the direction of the arrow in the figure, and first, as shown in FIG. It falls into the concave portion 7b of the area 7, and as a result, the contacts 9a and 9b between the first terminal 2 and the second terminal 3 are cut, and the motor 11 stops.

As described above, according to the multi-stage cam switch having the above-described configuration, the cam plate 1 is constituted by the first-stage cam 5 and the second-stage cam 6, and each of the first and second stage cams is provided on the outer periphery thereof in the axial direction. Cam regions 7, 8 with which the terminal 2 and the second terminal 3
And large diameter portions 7a, 8a with which the engaging portions 2a, 3a of the terminals 2, 3 engage with the cam regions 7, 8, respectively.
And the small-diameter portions 7b, 8b, the first terminal 2 and the second terminal 3 that are radially adjacent to the cam plate 1 are connected to each other while the contacts 9a, 9b are still connected to each other. The contacts 9a, 9 are not displaced toward the plate 1 side.
It is possible to reliably prevent the occurrence of a surge phenomenon between b.

In the above-described embodiment, only the case where the multi-stage cam switch according to the present invention is applied to a cam switch for controlling the stop of a motor has been described.
The present invention is not limited to this, and the present invention can perform various controls such as stopping of the driving device in multiple stages by attaching to various kinds of rotating shafts. Also, regarding the number of terminals,
The present invention is not limited to the above-mentioned three sheets, and a plurality of terminals are provided in the form of a laminate in the same manner, and a plurality of cam regions having a large diameter portion and a small diameter portion are formed on a cam plate. Can be used for multi-stage switch control.

[0028]

As described above, claim 1 or claim 2
According to the multistage cam switch described in the above, in a multistage cam switch having a plurality of terminals, a plurality of cam regions where each terminal abuts in the axial direction on the outer periphery of the cam plate, and each cam region has Since the large-diameter portion and the small-diameter portion with which each terminal engages are formed, the terminals adjacent in the radial direction of the cam plate can both drop to the cam plate side in a state where the respective contacts remain connected. Absent. As a result, with a simple structure, it is possible to reliably prevent the occurrence of a surge phenomenon between the terminals, and to stably operate the rotary drive device to which the terminal is attached.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of a multi-stage cam switch of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic configuration diagram showing a conventional multi-stage cam switch;
(A) is an initial state, (b) is a state where the contact between the second and third terminals is disconnected.

4A and 4B are schematic configuration diagrams showing a state in which a changeover switch is switched in the multi-stage cam switch of FIG. 3, wherein FIG. 4A is an initial state, and FIG. 4B is a state in which a contact between second and third terminals is disconnected; State (c) is a state in which the contact between the first and second terminals is disconnected.

[Description of Signs] 1 cam plate 2 1st terminal 3 2nd terminal 4 3rd terminal 5 1st stage cam 6 2nd stage cam 7 small diameter cam area 8 large diameter cam area 7a, 8a large diameter part 7b, 8b Recess (small diameter part) 9a, 9b, 9c, 9d Contact 12 Output shaft (rotary shaft)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G019 AA01 AF03 AM03 CY06 SK13 SY04 SY09 SY10 5G025 AA13 BA09 CA02 DA03 FA01 FA05 5H611 AA03 BB01 TT01 UA07

Claims (2)

[Claims] 1. A cam plate attached to a rotating shaft and having a large diameter portion and a small diameter portion formed on an outer peripheral portion, and the large diameter portion or the small diameter portion on the outer periphery of the cam plate with rotation of the rotating shaft. A plurality of terminals having elasticity provided so as to come into contact with the portion, and the terminals are sequentially provided in the radial direction of the cam plate so that the respective contacts can freely contact and separate from each other, and the cam plate In the large diameter portion, the contacts are in contact with each other by being pressed outwardly on the side of the terminal, and separated from the terminal adjacent to the outside by contacting the small diameter portion by the elasticity in the small diameter portion. In the multi-stage cam switch in which the above-mentioned contacts are cut off, a plurality of cam regions are formed on the outer periphery of the cam plate in the axial direction, and the large-diameter portion and the small-diameter portion are formed in each cam region. , Each of the above Multistage cam switch, characterized in that in the region, and the respective said terminal engaged. 2. A first terminal and a third terminal each formed by a leaf spring are sequentially provided in a radial direction of the cam plate.
The third terminal is fixed, and the cam plate is
The multi-stage cam switch according to claim 1, wherein a small-diameter cam region where the first terminal abuts and a large-diameter cam region where the second terminal abuts are integrally formed.