JPH11306905A - Stopper switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopper switch having a very short length, a proper waterproofness, and a frictionless structure. SOLUTION: The first leaf springs 9 and 13 with peripheries fixed are installed in a housing 1 having a reference surface for stopping 1a for a member to be sensed A at the end face in such a way as parallel with the reference surface 1a. A stopper surface 2a protruding from the reference surface 1a is fixed to the inside surfaces of the first leaf springs 9 and 13 in such a way as perpendicular to the first leaf springs, and the an operating shaft 2 is fixed where the opposite end of the stopper surface 2a is used as a movable contact 14. The second leaf spring 17 with the periphery fixed to the inside of the housing 1 is installed in the position confronting the first leaf springs 9 and 13 and a stationary contact 19 opposing to and situated apart from the movable contact 14 is installed on the inside surface of the second leaf spring 17. A waterproofing means 4 is installed between the opposing inner surface of the reference surface 1a of the housing 1 and the operating shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper switch which combines a stopper member for stopping a detection body at a predetermined position by contact with the detection body, and a switch for outputting a control signal immediately before the stop.

[0002]

2. Description of the Related Art Conventionally, a detection object (for example, a table on which a workpiece or an object to be measured is placed) is brought into contact with a stopper member such as a positioning bolt to stop the detector at a predetermined position. Have been.

In the above case, it is necessary to confirm that the detection object has hit the stopper member, or to perform control to switch the operation to reverse the movement of the detection object. Attaching a switch or dock that outputs such a control signal separately from the stopper member requires time and effort for installation, requires an installation space, and requires troublesome adjustment of the operating position of the switch.

[0004] In order to solve the above problems, the present applicant has
The invention of the stopper switch described in Japanese Patent Application Nos. 7-237544 and 8-355529 was made.

[0005]

The above-mentioned stopper switch requires a shaft that slides in a direction perpendicular to the stopper surface. Therefore, the sliding bearing length and the sliding shaft protrude from the bolt body. The length of the compression coil spring increases the length in the direction perpendicular to the stopper surface, so that there is a problem that a stopper switch having a short length is not suitable for applications requiring a short length. The present invention seeks to obtain a stopper switch having a short length.

[0006]

In order to solve the above-mentioned problems, a stopper switch according to the present invention comprises a housing having a stop reference surface of a detector on an end face, and a stop reference surface provided inside the housing. At least one first leaf spring whose outer periphery is fixed so as to be parallel, and fixed to be perpendicular to the first leaf spring on the inner periphery of the first leaf spring,
A stopper surface protruding from the stop reference surface is formed, and an outer periphery is fixed inside the housing at a position facing the first leaf spring and an operating shaft having a movable contact at an end opposite to the stopper surface. At least one second leaf spring, a fixed contact fixed to the inner periphery of the second leaf spring and opposed to and separated from the movable contact, an inner surface of the housing opposite to a stop reference surface, and the operating shaft. A waterproofing means is provided between the movable contact and the fixed contact while the detecting body is in contact with the stopper surface and the detecting body is displaced together with the stopper surface. The detection object stops at the stop reference position by hitting the stop reference surface.

Also, a housing having a stop reference surface of a detection body on an end surface, and at least one first leaf spring having an outer periphery fixed inside the housing so as to be parallel to the stop reference surface. And fixed to the inner periphery of the first leaf spring so as to be perpendicular to the first leaf spring, projecting from the stop reference surface to form a first stopper surface, and On the opposite side, parallel to the stop reference plane,
A second stopper surface is formed at a predetermined distance, and an operating shaft having a movable contact at the opposite end of the first stopper surface, and an outer periphery inside the housing at a position facing the first leaf spring. At least one fixed second leaf spring, fixed to the inner periphery of the second leaf spring, fixed contacts facing away from the movable contact, the stop reference surface and the second stopper surface To cover, a waterproof means made of a rubber boot is provided between the housing end and the operation shaft, and while the detection body is in contact with the first stopper surface and the detection body is displaced together with the operation shaft, The movable body and the fixed contact are brought into contact with each other, and the second stopper surface contacts the stop reference surface, so that the detection body stops at the stop reference position.

[0008]

FIG. 1 is a front view of a stopper switch according to an embodiment of the present invention, in which a cross section is centered, and FIG.
3 shows a front view of a leaf spring used in FIG. 3 described later.

In FIG. 1, reference numeral 1 denotes a housing, 1a denotes a stop reference plane, 2 denotes an operation shaft, and a left end surface 2a forms a stopper surface.

The operating shaft 2 has an annular projection 5 on a stepped portion 2b,
6, a diaphragm 4 made of a rubber material having
Subsequently, the first intermediate cylinder 7, the first intermediate ring 8 made of an insulating material, the first leaf spring (front) 9 (see FIG. 2), the second intermediate cylinder 10, and the lead wire 11a are soldered. The second intermediate ring 12 and the first leaf spring (rear) 13 (see FIG. 2) are inserted and fastened by the nut-shaped movable contact 14 and then housed in the inner cylinder of the housing 1.

Further, the outer diameter of the third intermediate ring 15 made of an insulating material is fitted to the inner cylinder of the housing 1 while being pressed toward the stop reference surface 1a, and is bonded to the inner cylinder of the housing 1. Have been. Second intermediate ring 12 and third intermediate ring 1
Grooves 21 and 22 in the XX 'direction are provided in a part of the outer periphery of 5 so that the lead wire 11a can pass therethrough.

A second leaf spring 17 (see FIG. 2) to which a nut 16 with a flange is fixed is inserted into the inner diameter of the third intermediate ring 15, and the outside of a fourth intermediate ring 18 made of a conductive material is inserted. The diameter is pressed and bonded.

A conductive pin 18 is provided at the right end of the fourth intermediate ring 18.
a is planted, and the lead wire 11b is soldered.

A screw-shaped fixed contact 19 is screwed into the nut 16 with a flange.
Are screwed into the inner diameter of the fourth intermediate ring 18.

Assuming that the amount of protrusion of the stopper surface 2a of the operating shaft 2 from the stop reference surface 1a is t1, and the distance between the movable contact 14 and the fixed contact 19 is t2, the fixed contact 19 is divided so that t1> t2. Turn 19a to adjust.

Next, the operation will be described. In the state shown in FIG. 1, the detection body A moves rightward (in the direction of the arrow) and abuts against the stopper surface 2a of the operation shaft 2, and the operation shaft 2 contacts the detection body A. Pressed first leaf spring (front) 9 and first leaf spring (rear) 13
Is displaced to the right while the spring is bent, the movable contact 14 at the right end of the operating shaft 2 contacts the fixed contact 19.

Further, when the operating shaft 2 is displaced rightward together with the detection body A, the movable contact 14 is displaced rightward while the second leaf spring 17 is also bent while the movable contact 14 remains in contact with the fixed contact 19. , The detection body A is the stop reference surface 1a of the housing 1.
Stop in contact with.

As described above, the movable contact 14 is fixed to the fixed contact 19.
, The lead wire 11a, the second intermediate ring 12, the first leaf spring (front) 9 and the first leaf spring (rear) 1
3, the second intermediate cylinder 10, the movable contact 14, the fixed contact 19,
A circuit including a nut 16 with a flange, a second leaf spring 17, a fourth intermediate ring 18, a conductive pin 18a, and a lead wire 11b is formed and sends an ON signal to a control circuit (not shown) to detect Make sure that A hits
In the direction of movement of.

FIG. 3 is a front view of a stopper switch according to another embodiment of the present invention. The reference numeral 41 denotes a housing, 41a denotes a stop reference surface, 42 denotes an operating shaft, and a left end surface 42a thereof is a first end. The opposing surface 42b of the housing 41, which is parallel to the stop reference surface 41a, forms a second stopper surface.

The operating shaft 42 has a first intermediate cylinder 46, a first leaf spring (front) 49 (see FIG. 2), a second intermediate cylinder 50,
A second intermediate ring 52 to which a lead wire 51a is soldered, a first leaf spring (rear) 53 (see FIG. 2) are inserted and fastened by a nut-shaped movable contact 54, and then an insulating washer-shaped It is housed in the inner cylinder of the housing 41 via the first intermediate ring 48.

Further, the outer diameter of the third intermediate ring 55 made of an insulating material is provided on the inner cylinder of the housing 41 by the stop reference surface 41a.
The housing 41
Is adhered to the inner cylinder. Grooves 61, 62 in the XX 'direction are provided on a part of the outer circumference of the second intermediate ring 52 and the third intermediate ring 55.
Are provided so that the lead wire 51a passes therethrough.

A second plate spring 57 (see FIG. 2) to which a nut 56 with a flange is fixed is inserted into the inside diameter of the third intermediate ring 55, and the outside of the fourth intermediate ring 58 made of a conductive material is inserted. The diameter is pressed and bonded.

A conductive pin 58 is provided on the right end of the fourth intermediate ring 58.
a is planted and the lead wire 51b is soldered.

A screw-shaped fixed contact 59 is screwed into the nut 56 with a flange.
Are screwed into the inner diameter of the fourth intermediate ring 58.

A groove 42c is provided on the left side of the operating shaft 42, and a round diameter portion 63a at one end of the rubber boot 63 is tightly fitted, and a round diameter portion 63b at the other end of the rubber boot 63 is provided.
Is placed in a groove 41b provided on the left side of the housing 41, and when the dust cover 64 is fitted to the housing 41, the round diameter portion 63b is pressed.

If the distance between the stop reference surface 41a and the second stopper surface 42b of the operating shaft 42 is T1, and the distance between the movable contact 54 and the fixed contact 59 is T2, the fixed contact 59 is set so that T1> T2. Turn the slit 59a to adjust.

Next, the operation will be described. In the state shown in FIG. 3, the detection body A moves rightward (in the direction of the arrow) and the operating shaft 42 moves.
Abuts on the first stopper surface 42a, and the operating shaft 42 is further pushed by the detection body A, thereby causing the springs of the first leaf spring (front) 49 and the first leaf spring (rear) 53 to be bent. When displaced to the right, the movable contact 54 at the right end of the operating shaft 42 becomes a fixed contact 59.
Contact

Further, when the operating shaft 42 is displaced rightward by being pushed by the detection body A, the movable contact 54 is displaced rightward while the second leaf spring 57 is also bent while the movable contact 54 remains in contact with the fixed contact 59. Then, the second stopper surface 42b comes into contact with the stop reference surface 41a of the housing 41, and the detection body A stops.

As described above, the movable contact 54 becomes the fixed contact 59
, The lead wire 51a, the second intermediate ring 52, the first leaf spring (front) 49 and the first leaf spring (rear) 5
3, the second intermediate cylinder 50, the movable contact 54, the fixed contact 59,
A circuit including a nut 56 with a flange, a second leaf spring 57, a fourth intermediate ring 58, a conductive pin 58a, and a lead wire 51b is formed, and an ON signal is sent to a control circuit (not shown) to detect Confirm that A has hit, or reverse the moving direction of the detection object A.

In FIGS. 1 and 3, the first and second leaf springs are two, but may be one, three or more, or the second leaf spring may be plural. Similarly, the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.

[0031]

As described above, the use of the leaf spring makes it possible to obtain a stopper switch having an extremely short length as compared with the conventional case using the sliding shaft and the compression coil spring.

Since a diaphragm and rubber boots are used, necessary and sufficient waterproofness can be obtained.

The frictionless structure does not require a shaft and a bearing structure which slides in the direction perpendicular to the stopper surface, so that there are extremely few failures.

[Brief description of the drawings]

FIG. 1 is a front view of a cross section at the center of a stopper switch.

FIG. 2 is a front view of a leaf spring.

FIG. 3 is a front view of a cross section at the center of a switch according to another embodiment.

[Explanation of symbols]

 1, 41 Housing 1a, 41a Stop reference surface 2, 42 Operating shaft 2a Stopper surface 4 Diaphragm 9, 49 First leaf spring (front) 13, 53 First leaf spring (rear) 14, 54 Movable contact 17, 57 Second leaf spring 19, 59 Fixed contact 42a First stopper surface 42b Second stopper surface 63 Rubber boot 64 Dust cover A Detector

Claims (2)

[Claims] 1. A housing having an end surface having a reference surface for stopping a detection body, and at least one first leaf spring having an outer periphery fixed inside the housing so as to be parallel to the reference surface for stopping. And a stopper surface fixed to the inner periphery of the first leaf spring so as to be perpendicular to the first leaf spring and protruding from the stop reference surface, and the opposite end of the stopper surface is referred to as a movable contact. Operating shaft, at a position facing the first leaf spring, at least one second leaf spring having an outer periphery fixed inside the housing, and fixed to an inner periphery of the second leaf spring. A fixed contact opposed to and separated from the movable contact, and a waterproof means provided between the inner surface of the housing opposite to the stop reference surface and the operating shaft, wherein the detection body contacts the stopper surface, and the detection body is While displacing with the stopper surface, A stopper switch characterized in that the movable contact and the fixed contact are brought into contact with each other, and the detection body stops at a stop reference position when the detection body hits the stop reference plane. 2. A housing having an end surface having a reference surface for stopping a detection body, and at least one first leaf spring having an outer periphery fixed inside the housing so as to be parallel to the reference surface for stopping. And fixed to the inner periphery of the first leaf spring so as to be perpendicular to the first leaf spring, projecting from the stop reference surface to form a first stopper surface, and On the opposite side, a second stopper surface is formed at a predetermined distance in parallel with the stop reference surface, and further opposes the operating shaft having the opposite end of the first stopper surface as a movable contact, and the first leaf spring. At least one second leaf spring having an outer periphery fixed inside the housing, and a fixed contact fixed to the inner periphery of the second leaf spring and opposed to and separated from the movable contact; How to cover the stop reference surface and the second stopper surface Waterproof means made of rubber boots is provided between the jing end and the operating shaft, and the movable contact and the movable contact are provided while the detector is in contact with the first stopper surface and the detector is displaced together with the operating shaft. A stopper switch, wherein the fixed contact is brought into contact and the second stopper surface contacts the stop reference surface, so that the detection body stops at the stop reference position.