JPS6116582Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a limit switch device.

In a lever type limit switch, the movable contact is turned on and off by the rotation of the lever, but there are two factors: the operating displacement of the lever when the movable contact is closed, and the operating limit, which is the mechanical limit of the lever rotation. A certain operating limit displacement amount is determined depending on the product, and it is difficult to close the movable contact by a minute displacement of the object to be detected and to increase the displacement of the lever after the movable contact is closed.

This invention solves the above-mentioned drawbacks by providing a limit switch device in which a movable contact is closed by a small displacement of an object to be detected, and in which a large displacement can be achieved after the movable contact is closed.

An embodiment of this invention will be described below with reference to FIGS. 1 to 5. In the figure, 1 is a base, 2 is a slidable movable body fitted in a bearing 3 fixed to the base 1,
4 is a lever type limit switch; 5 is a first lever consisting of a lever fixed to a spindle 4a of the lever type limit switch 4; 5a is a first lever 5;
6 is a sliding groove consisting of a long hole provided in the sliding groove 5.
a stopper whose position can be adjusted by being fastened to a, 7
9 is a second lever having an engager 8 made of a pin that engages with the sliding groove 5a and is slidable along this; 9 pivotally connects the upper end of the second lever 7 and the lower end of the movable body 2; 10 is a tension coil spring hung between the mounting hole 7a at the lower end of the second lever 7 and the fixed mounting pin 11 of the base 1, 12 is an upper stop pin fixed to the base 1, and 13 is a A lower stop pin 2a fixed to the main body 2 is a detection hole drilled at the upper end of the movable body 2. When a detected object (not shown) is engaged with this detection hole 2a, the upper and lower sides of the detected object are detected. Due to the displacement in the direction, the movable body 2 moves in the vertical direction.

That is, FIG. 1 shows that the displacement of the object to be detected is zero and the lever type limit switch 4 is in the normal state, and due to the downward displacement of the object to be detected, as shown in FIG. The first lever 5 is tilted counterclockwise from its normal position about the spindle 4a, and the movable contact (not shown) of the lever-type limit switch 4 is closed. The inclination angle θ of the first lever 5 at this time is determined by the characteristics of the lever-type limit switch 4.
If you move it along a and fix it at the desired location,
Since the second lever 7 is pressed against the stopper 6 by the tension coil spring 10, the distance R between the engager 8 and the spindle 4a can be adjusted. That is, if the operating displacement amount when the movable contact of the lever type limit switch 4 is closed is L1, L1 is expressed as L1=R sin θ, and when the stopper 6 is moved along the sliding groove 5a in FIG. If it is installed on the right side, the distance R becomes small, and therefore the displacement amount L1 can be set small.

Next, when the detection hole 2a is further lowered as shown in FIG. 3, the first lever 5 rotates until it comes into contact with the lower stop pin 13. If the rotation angle at this time is made slightly smaller than the operating limit angle that the lever type limit switch 4 has as a characteristic, a large load does not need to be applied to the inside of the lever type limit switch 4. Next, when the detection hole 2a further descends, the engager 8 moves along the sliding groove 5a to the second lever 7.
4, the detection hole 2a can be lowered until the engagement element 8 reaches the leftmost end of the sliding groove 5a, as shown in FIG. 2a and the detection hole 2a shown in FIG. 4, that is, the operating limit displacement amount L2 can be set large.

Furthermore, when the detection hole 2a rises from the state shown in FIG. After contact, the first lever 5 begins to rotate clockwise, returning to the state shown in FIG.

Also, when the detection hole 2a rises from the state shown in FIG. 1, the same process as described above is performed. That is, after the first lever 5 rotates clockwise and the movable contact of the lever-type limit switch 4 closes, the rotation progresses further and the first lever 5 comes into contact with the upper stop pin. And the engager 8
slides along the sliding groove 5a toward the rotation end of the second lever 7, and reaches the operating limit position as shown in FIG. Therefore, the stopper 6 can adjust the amount of operational displacement of the movable body 2 required to operate the lever-type limit switch 4, setting the amount of operational displacement small and setting the amount of displacement after operation large. can do.

In this embodiment, the stopper 6 is used to vary the amount of displacement required to operate the lever-type limit switch 4, but this may be omitted if variation is not required. Also, in this embodiment, the movable body 2 is provided, but it is clear that the same effect can be obtained even if this is made up of an essential part of the object to be detected.

As explained above, this invention has a sliding groove in the first lever of a lever-type limit switch, and a second lever that engages with the sliding groove and is biased toward the main body of the lever-type limit switch. When the contact is closed, it rotates with a small rotation radius, and when the rotation limit angle of the lever type limit switch is reached, the engager moves toward the rotation end along the sliding groove of the first lever. It is something. This realizes a limit switch device in which the movable contact is closed by a small displacement of the object to be detected, and in which the displacement after the movable contact is closed is large.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one embodiment of the limit switch device according to this invention, and FIGS. 2 to 5 are diagrams each explaining the operation of the limit switch device of FIG. 1. DESCRIPTION OF SYMBOLS 1... Base body, 2... Movable body, 4... Lever type limit switch, 5... First lever, 5a... Sliding groove, 7... Second lever, 8... Engagement element. In addition,
Identical parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] A lever-type limit switch mounted on a base body, a movable body that is displaced along a predetermined path, a first lever that is made up of the lever of the limit switch and has a sliding groove along its length and that rotates by a predetermined angle from a normal position; a second lever whose axis intersects with the longitudinal axis of the first lever and whose one end is pivoted to the movable body and biased toward the body of the limit switch; The first lever is formed to be movable within the moving part and is engaged with the first lever, and is in the normal position due to the operation of the movable body, and after the first lever reaches a rotation end position, the first lever is moved within the sliding part. A limit switch device comprising: an engaging element that moves toward the rotation end of the first lever.