JPH0237631A - Limit switch - Google Patents

Limit switch

Info

Publication number
JPH0237631A
JPH0237631A JP18584788A JP18584788A JPH0237631A JP H0237631 A JPH0237631 A JP H0237631A JP 18584788 A JP18584788 A JP 18584788A JP 18584788 A JP18584788 A JP 18584788A JP H0237631 A JPH0237631 A JP H0237631A
Authority
JP
Japan
Prior art keywords
return spring
main shaft
shaft
auxiliary
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP18584788A
Other languages
Japanese (ja)
Other versions
JP2621939B2 (en
Inventor
Yoshiyuki Yamawaki
山脇 佳之
Yoshio Takase
高瀬 洋志夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP63185847A priority Critical patent/JP2621939B2/en
Publication of JPH0237631A publication Critical patent/JPH0237631A/en
Application granted granted Critical
Publication of JP2621939B2 publication Critical patent/JP2621939B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

PURPOSE:To easily set the operation position to the required angle by moving an operating shaft against a return spring in the direction crossing the axial direction of a principal shaft with a cam section provided on the principal shaft and having a circular arc-shaped cross section to drive a switch main body. CONSTITUTION:A cam section 13 with a circular arc-shaped cross section is formed on a principal shaft 10 fitted with an actuator 1 on one end and rotatably supported in a head section 21, an operating shaft 19 freely slidable in the axial direction and a return spring exciting it are arranged in a case 2 storing a switch main body, a cam body 14 is fitted to the principal shaft 10, an auxiliary return spring 30 made of a torsion coil spring is also fitted to it. When the principal shaft 10 is rotated to the angle where the return by the return spring becomes difficult, a coupling section 14 provided on the principal shaft 10 is coupled with the auxiliary return spring 30, a return force is applied to the principal shaft from the auxiliary return spring 30. The operation position can be easily set to the required angle.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

本発明はリミットスイッチ、殊にローラアーム型アクチ
ュエータを備えているリミットスイッチに関するもので
ある。
The present invention relates to a limit switch, and in particular to a limit switch equipped with a roller arm type actuator.

【従来の技術】[Conventional technology]

第9図に示すような、ローラアーム型のアクチュエータ
1を備えたリミットスイッチがある。これは、操作体9
がアクチュエータ1先端のローラ11に接してアクチュ
エータ1を回動させる時、アクチュエータ1が所定角度
まで回動したならば、ケース2内に設けられたスイッチ
本体の接点が切り換わるようにしたもので、この種のリ
ミットスイッチとしては、特公昭60−22509号公
報に示されたものがある。 これは第10図乃至第12図に示すように、ケース2に
設けたヘッド部21内に、アクチュエータ1が一端に装
着されている主軸10を挿通するとともに、主軸10と
一体に回動するカム16を配置し、更に両端片をヘッド
部21の内面とカム16とに夫々係止させるねじりコイ
ルばね17を設けて、このねじりコイルばね17が主軸
10とカム16及びアクチュエータ1を中立位置に保持
するものとし、第11図に示すように、アクチュエータ
1と共に主軸10とカム16とが回転する時、カム16
の外面に設けた凹部に嵌まり込んでいた円筒ころ乃至球
からなる部材18が作動軸19を押圧して、スイッチ本
体20の押釦22を押し込むものであり、アクチュエー
タ1に対する押圧力がなくなれば、ねじりコイルばね1
7による復帰力によって、主軸10とカム16及びアク
チュエータ1が復帰し、作動軸19はスイッチ本体20
側から与えられる復帰力によって復帰する。 また、第13図及び第14図に示す形態のものも提供さ
れている。これは主軸10に切り欠きを形成して断面が
円弧状となるカム部13を設け、このカム部13の縁で
直接作動軸19を押圧するものであり、復帰は作動軸1
9を付勢している復帰ばね3によって行なう。
There is a limit switch equipped with a roller arm type actuator 1 as shown in FIG. This is the operating body 9
When the actuator 1 contacts the roller 11 at the tip of the actuator 1 and rotates the actuator 1, if the actuator 1 rotates to a predetermined angle, the contacts of the switch body provided in the case 2 are switched. This type of limit switch is disclosed in Japanese Patent Publication No. 60-22509. As shown in FIGS. 10 to 12, a main shaft 10 with an actuator 1 attached to one end is inserted into a head portion 21 provided in a case 2, and a cam rotates together with the main shaft 10. 16, and further provided with a torsion coil spring 17 whose end pieces are respectively locked to the inner surface of the head portion 21 and the cam 16, and this torsion coil spring 17 holds the main shaft 10, the cam 16, and the actuator 1 in a neutral position. As shown in FIG. 11, when the main shaft 10 and the cam 16 rotate together with the actuator 1, the cam 16
The member 18 made of a cylindrical roller or ball fitted into a recess provided on the outer surface of the switch presses the actuating shaft 19 and pushes the push button 22 of the switch body 20. When the pressing force on the actuator 1 is removed, Torsion coil spring 1
7 causes the main shaft 10, cam 16, and actuator 1 to return, and the actuating shaft 19 returns to the switch body 20.
It recovers by the restoring force given from the side. Furthermore, the configurations shown in FIGS. 13 and 14 are also provided. This is a method in which a notch is formed in the main shaft 10 and a cam portion 13 having an arcuate cross section is provided, and the edge of this cam portion 13 directly presses the operating shaft 19.
This is done by the return spring 3 which is biasing 9.

【発明が解決しようとする課ffl 前者においては、アクチュエータ1を回動させることが
できる範囲、つまりトータルトラベルTTPの量を、9
0’以上の範囲にわたるものとすることができる利点を
有しているのであるが、アクチュエータ1を何度回動さ
せた時にスイッチ本体20が作動するのかの設定、つま
り動作位置OPの設定を希望する角度のものとすること
が難しい。 後者においては、主軸10に形成したカム部13の大き
さを変えることによって、動作位置OPを所要の角度と
することが容易に行なえるのであるが、主軸10の回動
角度θが大きくなると、第15図に示すように、復帰ば
ね3が作動軸19を介して主軸10に与える復帰力によ
る主軸10とアクチュエータ1との復帰が困難となるた
めに、トータルトラベルTTPについての制限が生じて
いる。また、作動軸19を付勢する復帰ばね3のばね力
のみでアクチュエータ1も復帰させることから、主軸1
0のカム部13と作動軸19との間の接触圧が大きくな
るために、第16図に示すように、作動軸19の端面に
ステンレス等の金属からなる保護板19aを取り付ける
ことが行われているが、この場合でも、動作回数が多く
なると、ガム部13及び保護板19aが削れてスイッチ
の動作位置がずれてきたり、削れたことで生じる金属粉
が絶縁不良をを招いたりする。更には、このような削れ
が生じることを防ぐために、復帰ばね3のばね力を小さ
くしたならば、第17図に示すように、ますます復帰不
良を招くおそれが高くなる。 本発明はこのような点に鑑み為されたものであり、その
目的とするところは動作位置を所要の角度とすることが
容易である上に、トータルトラベルも大きくとることが
できるリミットスイッチを提供するにある。 【課題を解決するための手段】 しかして本発明は、回動自在に支持された主軸にアクチ
ュエータが取り付けられ、主軸に設けられた円弧状断面
を持つカム部で主軸の軸方向と交叉する方向に作動軸を
復帰ばねに抗して移動させてスイッチ本体を駆動するリ
ミットスイッチにおいて、主軸にねじりコイルばね型の
補助復帰ばねを装着するとともに、主軸の所要角度以上
の回動で補助復帰ばねと係合して補助復帰ばねからの復
帰力を主軸に与える係合部を主軸に設けていることに特
徴を有している。 [作用] 本発明によれば、作動軸を付勢する復帰ばねによる復帰
が困難となる角度以上に主軸が回動する時には、主軸に
設けた係合部が補助復帰ばねに係合して、補助復帰ばね
から主軸に復帰力が加えられており、主軸の復帰が確実
になされるものである。 [実施例] 以下本発明を図示の実施例に基づいて詳述すると、第1
図に示すように、このリミットスイッチは、作動軸19
の駆動に関し、基本的に前記第13図及び第14図に示
したものと同様の構造を持つもので、アクチュエータ1
が一端に装着されるとともにヘッド部21内において回
動自在に支持される主軸10は、断面円弧状のカム部L
3が形成されており、スイッチ本体を内蔵するケース2
には、軸方向摺動が自在とされた作動軸19と、これを
付勢する復帰ばね(図示せず)とが配設されている。主
軸10が回動する時、そのカム部13が作動軸19を押
圧して、スイッチ本体を作動させるものである。 そして、ここにおける主軸10には、カム体14が装着
されているとともに、ねじりコイルばねからなる補助復
帰ばね30が装着されている。カム体14と主軸10と
の両者を貫通するビン15によってカム体14は主軸1
0と共に回転するように構成され、ねじりコイルばねか
らなる補助復帰ばね30は、そのコイル部が主軸10に
遊転自在に被せられ、両端片が夫々ヘッド部21の内面
に形成されているばね受は段部23,23に夫々当接す
るものとなっている。尚、ノ\ノド部21の内面には、
第5図にも示すように、上記ビン15が当接自在な段部
24,24も備えており、主軸10の回動範囲がこの両
者によって制限されている。 上記カム体14は、第3図及び第4図に示すように、主
軸10の回転角度が所要角度θを越えた時点で補助復帰
ばね30の一方の端片と係合し、主軸10の以後の回動
について、作動軸1つを介して与えられる復帰ばねから
の復帰力だけでなく、補助復帰ばね30からの復帰力も
与える。 今、復帰ばねのばね定数を第17図に示す特性を有する
ものとし、また補助復帰ばね30のばね定数fを第6図
中に破線で示すようなものとして、スイッチ本体の復帰
位置に相当する回動角度に上記θを設定した場き、第6
図に実線で示す特性を得られることになり、トータルト
ラベルTTPを90°とした時にも、アクチュエータ1
に加わる力がなくなると、主軸10は補助復帰ばね30
からの力で復帰を開始し、補助復帰ばね30の力が作用
しなくなる角度、この場合はスイッチ本体の復帰位置ま
で復帰すれば、以後、作動軸1つを付勢している復帰ば
ねの力によって中立位置まで復帰する。 カム体14と補助復帰ばね30との係合が、オーバート
ラベルOT領域において開始されるようにした場合、例
えば第7図に示すように、所要角度θを60°とすると
ともに、復帰ばねのばね定数を前記第15図に示した特
性を発揮するものとした場合には、第8図に示す特性を
得ることができる。この場き、確実な復帰を得られるこ
とはもちろん、アクチュエータ1に衝撃的負荷が加えら
れた時のP&街が補助復帰ばね30によってなされるこ
とにもなる。
Problem to be solved by the invention ffl In the former case, the range in which the actuator 1 can be rotated, that is, the amount of total travel TTP, is set to 9
Although it has the advantage that it can be set over a range of 0' or more, I would like to set the number of times the actuator 1 is rotated to activate the switch body 20, that is, the setting of the operating position OP. It is difficult to get the right angle. In the latter case, by changing the size of the cam portion 13 formed on the main shaft 10, the operating position OP can be easily adjusted to a desired angle, but as the rotation angle θ of the main shaft 10 increases, As shown in FIG. 15, the return force applied by the return spring 3 to the main shaft 10 via the operating shaft 19 makes it difficult to return the main shaft 10 and the actuator 1, resulting in a limit on the total travel TTP. . Furthermore, since the actuator 1 is also returned only by the spring force of the return spring 3 that urges the operating shaft 19, the main shaft 1
In order to increase the contact pressure between the cam part 13 and the operating shaft 19, a protective plate 19a made of metal such as stainless steel is attached to the end surface of the operating shaft 19, as shown in FIG. However, even in this case, if the number of operations increases, the gum portion 13 and the protective plate 19a may be scraped and the operating position of the switch may be shifted, and metal powder produced by the scraping may cause insulation failure. Furthermore, if the spring force of the return spring 3 is reduced in order to prevent such abrasion from occurring, there is a greater possibility that return failure will occur, as shown in FIG. 17. The present invention has been made in view of these points, and its purpose is to provide a limit switch that not only makes it easy to set the operating position to a required angle, but also allows for a large total travel. There is something to do. [Means for Solving the Problems] Accordingly, in the present invention, an actuator is attached to a rotatably supported main shaft, and a cam portion having an arcuate cross section provided on the main shaft moves in a direction intersecting the axial direction of the main shaft. In a limit switch that drives the switch body by moving the operating shaft against a return spring, an auxiliary return spring of the torsion coil spring type is attached to the main shaft, and the auxiliary return spring is activated when the main shaft is rotated beyond the required angle. It is characterized in that the main shaft is provided with an engaging portion that engages and applies a return force from the auxiliary return spring to the main shaft. [Operation] According to the present invention, when the main shaft rotates beyond an angle at which return by the return spring that biases the operating shaft becomes difficult, the engaging portion provided on the main shaft engages with the auxiliary return spring, A return force is applied to the main shaft from the auxiliary return spring, and the return of the main shaft is ensured. [Example] The present invention will be described in detail below based on the illustrated example.
As shown in the figure, this limit switch has an operating shaft 19
Regarding the drive of the actuator 1, it basically has the same structure as shown in FIG. 13 and FIG.
The main shaft 10, which is attached to one end and rotatably supported within the head portion 21, has a cam portion L having an arcuate cross section.
3 is formed, and case 2 has a built-in switch body.
An operating shaft 19 that can freely slide in the axial direction and a return spring (not shown) that biases the operating shaft 19 are disposed. When the main shaft 10 rotates, its cam portion 13 presses the operating shaft 19 to operate the switch body. A cam body 14 is attached to the main shaft 10 here, and an auxiliary return spring 30 made of a torsion coil spring is attached. The cam body 14 is connected to the main shaft 1 by a bottle 15 passing through both the cam body 14 and the main shaft 10.
The auxiliary return spring 30 is configured to rotate with the head 21 and is configured to rotate with the head 21 and has a coil portion placed over the main shaft 10 so as to freely rotate. are in contact with the stepped portions 23, 23, respectively. In addition, on the inner surface of the throat part 21,
As shown in FIG. 5, it is also provided with stepped portions 24, 24 on which the bin 15 can freely abut, and the range of rotation of the main shaft 10 is limited by these two. As shown in FIGS. 3 and 4, the cam body 14 engages with one end piece of the auxiliary return spring 30 when the rotation angle of the main shaft 10 exceeds the required angle θ, and the cam body 14 engages with one end piece of the auxiliary return spring 30, and Regarding the rotation, not only the return force from the return spring applied via one operating shaft but also the return force from the auxiliary return spring 30 is applied. Now, assume that the spring constant of the return spring has the characteristics shown in Fig. 17, and the spring constant f of the auxiliary return spring 30 as shown by the broken line in Fig. 6, which corresponds to the return position of the switch body. When the rotation angle is set to the above θ, the sixth
The characteristics shown by the solid line in the figure can be obtained, and even when the total travel TTP is 90°, the actuator 1
When the force applied to the main shaft 10 is removed, the auxiliary return spring 30
When the force from the auxiliary return spring 30 stops acting, in this case the return position of the switch body, the force of the return spring that biases one actuating shaft will be reduced. returns to the neutral position. When the engagement between the cam body 14 and the auxiliary return spring 30 is started in the overtravel OT region, for example, as shown in FIG. When the constants are set to exhibit the characteristics shown in FIG. 15, the characteristics shown in FIG. 8 can be obtained. At this time, not only a reliable return can be obtained, but also the auxiliary return spring 30 performs the P&return when an impact load is applied to the actuator 1.

【発明の効果】【Effect of the invention】

以上のように本発明においては、主軸に設けられた円弧
状断面を持つカム部で主軸の軸方向と交叉する方向に作
動軸を復帰ばねに抗して移動させてスイッチ本体を駆動
するタイプであることがら、動作位置OPを求める角度
に容易に設定することができるものであり、しがちこの
タイプにおいて復帰力が原因となっているトータルトラ
ベルTTPについての問題は、主軸にねじりコイルばね
型の補助復帰ばねを装着するとともに、主軸の所要角度
以上の回動で補助復帰ばねと係合して補助復帰ばねから
の復帰力を主軸に与える係合部を主軸に設けていること
から、復帰ばねによる復帰が困難となる角度以上に主軸
が回動する時には、主軸に設けたカム体が補助復帰ばね
と係合して補助復帰ばねから復帰力が加えられるもので
あり、従ってトータルトラベルTTPについての問題を
解消することができるものである。
As described above, in the present invention, the switch body is driven by moving the actuating shaft in a direction intersecting the axial direction of the main shaft against the return spring using a cam portion having an arcuate cross section provided on the main shaft. For some reason, the operating position OP can be easily set to the required angle, and the problem with the total travel TTP, which is often caused by the return force in this type, is that the main shaft is equipped with a torsion coil spring type. In addition to installing the auxiliary return spring, the main shaft is equipped with an engaging part that engages with the auxiliary return spring when the main shaft rotates beyond the required angle and applies a return force from the auxiliary return spring to the main shaft. When the main shaft rotates beyond an angle at which it is difficult to return due to It is something that can solve the problem.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明一実施例の分解斜視図、第2図は同上の
主軸の側面図、第3図及び第4図は同上の正面図、第5
図(、)(b)のヘッド部の正面図と断面図、第6図は
同上の動作特性図、第7図は他の補助復帰ばねの特性図
、第8図は同上の動作特性図、第9図はローラアーム型
アクチュエータの動作を示す正面図、第10図及び第1
1図は従来例の断面図、第12図は同上の分解斜視図、
第13図は他の従来例の分解斜視図、第14図は同上の
断面図、第15図は同上の特性図、第1θ図は更に他の
従来例の部分正面図、第17図は同上の特性図であって
、1はアクチュエータ、10は主軸、13はカム部、1
4はカム体、19は作動軸、21はヘッド部、30は補
助復帰ばねを示す。 第3図
FIG. 1 is an exploded perspective view of one embodiment of the present invention, FIG. 2 is a side view of the main shaft of the same, FIGS. 3 and 4 are front views of the same, and FIG.
A front view and a cross-sectional view of the head part in Figures (,) and (b), Figure 6 is an operating characteristic diagram of the same as above, Figure 7 is a characteristic diagram of another auxiliary return spring, Figure 8 is an operating characteristic diagram of the same as above, Figure 9 is a front view showing the operation of the roller arm type actuator, Figure 10 and Figure 1.
Figure 1 is a sectional view of the conventional example, Figure 12 is an exploded perspective view of the same as above,
Fig. 13 is an exploded perspective view of another conventional example, Fig. 14 is a sectional view of the same as above, Fig. 15 is a characteristic diagram of the same as above, Fig. 1θ is a partial front view of another conventional example, and Fig. 17 is the same as above. 1 is a characteristic diagram of the actuator, 10 is the main shaft, 13 is the cam part, 1
4 is a cam body, 19 is an operating shaft, 21 is a head portion, and 30 is an auxiliary return spring. Figure 3

Claims (3)

【特許請求の範囲】[Claims] (1)回動自在に支持された主軸にアクチュエータが取
り付けられ、主軸に設けられた円弧状断面を持つカム部
で主軸の軸方向と交叉する方向に作動軸を復帰ばねに抗
して移動させてスイッチ本体を駆動するリミットスイッ
チにおいて、主軸にねじりコイルばね型の補助復帰ばね
を装着するとともに、主軸の所要角度以上の回動で補助
復帰ばねと係合して補助復帰ばねからの復帰力を主軸に
与える係合部を主軸に設けていることを特徴とするリミ
ットスイッチ。
(1) An actuator is attached to a rotatably supported main shaft, and a cam part with an arcuate cross section provided on the main shaft moves the actuating shaft in a direction intersecting the axial direction of the main shaft against a return spring. In limit switches that drive the switch body, a torsion coil spring-type auxiliary return spring is attached to the main shaft, and when the main shaft is rotated beyond the required angle, it engages with the auxiliary return spring to absorb the return force from the auxiliary return spring. A limit switch characterized in that the main shaft is provided with an engaging portion that acts on the main shaft.
(2)係合部はスイッチ本体の復帰位置以上の回動で補
助復帰ばねに係合するものであることを特徴とする請求
項1記載のリミットスイッチ。
(2) The limit switch according to claim 1, wherein the engaging portion engages with the auxiliary return spring when the switch body is rotated beyond the return position.
(3)係合部はスイッチ本体の動作位置以上の回動で補
助復帰ばねに係合するものであることを特徴とする請求
項1記載のリミットスイッチ。
(3) The limit switch according to claim 1, wherein the engaging portion engages with the auxiliary return spring when the switch body is rotated beyond the operating position.
JP63185847A 1988-07-26 1988-07-26 Limit switch Expired - Lifetime JP2621939B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63185847A JP2621939B2 (en) 1988-07-26 1988-07-26 Limit switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63185847A JP2621939B2 (en) 1988-07-26 1988-07-26 Limit switch

Publications (2)

Publication Number Publication Date
JPH0237631A true JPH0237631A (en) 1990-02-07
JP2621939B2 JP2621939B2 (en) 1997-06-18

Family

ID=16177922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63185847A Expired - Lifetime JP2621939B2 (en) 1988-07-26 1988-07-26 Limit switch

Country Status (1)

Country Link
JP (1) JP2621939B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH043081U (en) * 1990-04-24 1992-01-13

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50123467A (en) * 1974-03-15 1975-09-27
JPS5426479A (en) * 1977-07-29 1979-02-28 Omron Tateisi Electronics Co Limit switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50123467A (en) * 1974-03-15 1975-09-27
JPS5426479A (en) * 1977-07-29 1979-02-28 Omron Tateisi Electronics Co Limit switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH043081U (en) * 1990-04-24 1992-01-13

Also Published As

Publication number Publication date
JP2621939B2 (en) 1997-06-18

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