JPS6013136Y2 - Actuator limit switch device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a limit switch device for limiting the operating range of an electric actuator or the like having a reciprocating shaft.

Figures 1 to 3 show conventional examples of this type of device. In the figures, 1 is a driving electric motor, 2 is a gear device that reduces the rotation speed of the electric motor 1, 3 is a gear box, and 4 is a gear device 2. A jack screw shaft 5 that transmits the output of the jack screw shaft 4 is a reciprocating shaft 6 that is screwed into the jack screw shaft 4 and converts rotational motion into linear motion.
is a housing that is connected to the gear box 3 and supports the jack screw shaft 4 and the reciprocating shaft 5 through ball bearings 6a and flat bearings 6b; 7 and 8 are covers that close the opening of the housing 6; 9 is a reciprocating shaft; an actuator protruding from the outer periphery of the motion shaft 5;
10 is a switch that operates by contacting the actuator 9, such as a microswitch; 11 is a switch mounting base that supports the switch 10; 12 is a mounting screw that fixes the switch 10 to the mounting base 11; and 13 is an end supported on the housing 6. The adjusting screw shaft 14 drives the switch mount 11 in the axial direction and adjusts the position of the switch mount 11. Reference numeral 14 is a retaining ring that prevents the end of the adjusting screw shaft 13 from coming off from the housing 6.

As shown in FIG. 2, the adjusting screw shaft 13 consists of a pair of screw shafts 13a and 13b that are parallel to each other, and the switch mounting base 11 is supported at predetermined positions of the screw shafts 13a and 13b, respectively.

With the above structure, the jack screw shaft 4 rotates at a low speed reduced by the gear device 2 as the electric motor 1 rotates.

The reciprocating shaft 5 screwed into the jack screw shaft 4 cannot rotate because the actuator 9 is prevented from rotating by the cover 8, and moves in either the left or right direction depending on the direction of rotation of the jack screw shaft 4.

The reciprocating axis 5 is at the extension end (right side) or contraction end (left side)
When the motor approaches 1, the actuator 9 comes into contact with a switch 10 mounted on a switch mount 11, and the switch 10 is operated to open the control circuit of the motor 1 and stop the motor 1.

When changing the stop position of the reciprocating shaft 5, for example, by rotating the screw shaft 13a from the outside of the housing 6, the switch support 11 is moved to the unsupported screw shaft 1.
Since rotation is prevented by 3b, it is possible to move in either the left or right direction and stop the reciprocating shaft 5 at a desired position.

By the way, in the conventional device configured as described above, the switch mount 11 is attached to two long adjustment screw shafts 13, and when the adjustment screw shafts 13 are rotated to adjust the position of the switch mount 11, Since the adjustment screw shafts 13 are used to prevent the switch mounting base 11 attached to the other screw shafts 13a and 13b from rotating, there is a possibility that the adjustment screw shafts 13 may be bent due to lack of rigidity, and the operation of the switch 10 may become unstable. Ta.

Furthermore, when this type of device is used for aircraft, the cover 7 is constructed so that it cannot be easily removed, and the position cannot be adjusted while looking at the switch mount 11 attached to the adjustment screw shaft 13. If the switch mounting base 11 is set in the wrong position, there is a possibility that an undesirable situation may occur in which the reciprocating shaft 5 or the switch 10 collides with a fixed part such as the ball bearing 6a and stops with an impact. .

The purpose of this invention is to improve the above-mentioned drawbacks. A highly rigid guide member is provided parallel to the reciprocating axis, and the switch mount is guided by this guide member, and the switch mount is attached to the adjustment screw shaft. A limit switch device is provided which is provided with a stop nut that limits the range of movement of the limit switch device.

An embodiment of this invention will be described below with reference to FIGS. 4 to 6.

In the figure, the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts, and 15 is a reciprocating shaft 5 that guides the actuator 9.
A guide member 16 forms a guide groove 15a parallel to the guide member 15, and sliding surfaces 15b and 15c for sliding the switch mount 11 in the axial direction; Leaf spring pressing against 15c, 17
18 is a mounting screw for fixing the leaf spring 16 to the guide member 15;
are the adjustment screws 13 on both sides of the switch mounting base 11.
After the operating position of the switch 10 has been set with a stop nut that is attached to the switch mount 11 and limits the range of movement of the switch mount 11, it is assembled into the machine and glued to the predetermined adjustment range so that the necessary position adjustment can be made. Fix the stop nut with etc.

With the structure described above, the contact 9 of the reciprocating shaft 5 is prevented from rotating by the guide groove 15a formed in the guide member 15, so that the reciprocating shaft 5 can move in either the left or right axial direction depending on the rotation direction of the jack screw shaft 4. do.

The operation of the reciprocating shaft 5 coming into contact with the switch 10 via the contactor 9 and stopping at the extended end or the contracted end is the same as in the conventional art, so a detailed explanation will be omitted.

Next, when changing the stop position of the reciprocating shaft 5, by rotating the adjusting screw shaft 13 from the outside of the housing 6, the switch support base 11 is moved by sliding the guide member 15 as shown in FIG. Since rotation is prevented by the moving surfaces 15b and 15e, the reciprocating shaft 5 can be moved in either the left or right direction and stopped at a desired position.

At this time, if the adjustment screw shaft 13 is accidentally turned more than necessary, the side of the switch mounting base 11 will hit the nut 18, preventing the adjustment range from expanding.

The position of the nut 18 is set so that even if the switch mounting base 11 is set to its full adjustment range, the switch 10 is activated before the end of the reciprocating shaft 5 collides with the fixed part.

As described above, according to this invention, a highly rigid guide member is provided parallel to the reciprocating shaft, and the switch mounting base is guided by this guide member, thereby preventing deflection due to insufficient rigidity of the adjusting screw shaft. Since the adjustment screw shaft is equipped with a stop nut that limits the range of movement of the switch mounting base, the switch is activated and the actuator can be safely stopped before the reciprocating shaft or the switch collides with the fixed part. can.

[Brief explanation of the drawing]

Fig. 1 to Fig. 3 show a conventional example, Fig. 1 is a longitudinal cross-sectional view, Fig. 2 is a cross-sectional view of the main part, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 2, and Fig. 4- FIG. 6 shows an embodiment of this invention, FIG. 4 is a longitudinal sectional view, FIG. 5 is a plan view of the main part, and FIG. In the figures, the same reference numerals indicate the same or corresponding parts, 5
1 is a reciprocating shaft, 9 is an actuator, 10 is a switch, 11 is a switch mounting base, 13 is an adjustment screw shaft, 15 is a guide member, 1
6 is a leaf spring, and 18 is a stop nut.

Claims (2)

[Scope of utility model registration request] (1) An actuator protruding from the outer periphery of the reciprocating shaft, a guide member that guides the actuator into a guide groove formed parallel to the reciprocating shaft, and an actuator that operates in contact with the actuator. A limit switch device for an actuator, comprising: a switch mounting base that supports a switch, is pressed by a spring against the guide member, and is movable in the axial direction; and an adjustment screw shaft that drives the switch mounting base in the axial direction. (2) The limit switch device for an actuator according to claim 1, wherein the adjusting screw shaft has a stop nut that restricts the movement range of the switch mounting base.