JPH0319154Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a limit switch mechanism suitable for a positioning device or the like.

[Technical background of the invention and its problems]

In positioning devices and the like, limit switches are installed at positions that limit the range of movement of a moving body in order to prevent it from overrunning. For example, as shown in FIG. 2, limit switches 3, 3 are installed at positions that limit the range of movement of the moving path 2 of the moving object 1, and wiring 4 is installed in each. When the movable body reaches the limit position, the contact pieces 5 of the movable body 1 abut against the limit switches 3, 3, and the stop process is performed depending on whether the movable body is electrically conductive or non-conductive.

However, in this device, limit switch 3,
3 requires wiring 4 for each, and changing the stopping position is not easy. Additionally, the limit switch 3 had drawbacks such as being prone to failure when excessive force was applied.

[Purpose of the invention] The present invention has been made to eliminate the above-mentioned disadvantages, and an object of the present invention is to provide a limit switch mechanism that is less likely to fail and whose movement range can be easily changed.

[Summary of the idea]

In the present invention, a tape switch that is shaped like a tape and conducts electricity when pressed is provided along the moving path of the moving body, and an actuating body that presses the tape switch or releases the pressure when the moving body comes into contact is provided at a restriction position. This is the configured limit switch mechanism.

[Example of idea]

The details of the present invention will be explained below with reference to an embodiment shown in FIG. First, a positioning device to which this embodiment is applied will be explained. Reference numeral 11 denotes a base, on which bearing brackets 12, 12 are mounted spaced apart from each other. These bearing brackets 12, 12
A feed screw body 13 is rotatably supported on the
Further, a guide body 14 is supported and fixed to both bearing brackets 12, 12 in parallel with the feed screw body 13. Furthermore, a movable body 15 is slidably fitted into the guide body 14, and as the feed screw body 13 rotates, the movable body 15 is fed and positioned at a predetermined position. The drive body 16 of this feed screw body 13
The explanation will be omitted.

Now, a limit switch mechanism for preventing the moving body 15 of the above-mentioned positioning device from overrunning will be explained. Reference numeral 21 denotes a tape switch formed in a tape shape and made conductive by pressing, and is connected to the bearing bracket 12,
A moving path 22 along which a moving body 15 moves is laid inside the moving body 12 . Actuating bodies 23, 23 are attached to the sides of the tape switch 21 at positions that limit the range of movement of the movable body 15. An L-shaped contact 27 is rotatably attached to a bracket 25 attached to the base 11 via a pin 26, and this contact 27 has a pressing portion 28 at the tip of one (lower) side. is in contact with the surface of the tape switch, and a sliding contact piece 29 made of a flexible leaf spring is attached to the tip of the other side. Further, a contact body 32 is attached to the lower surface of the movable body 15 and has contact slope portions 31, 31 formed at both ends thereof. This limit switch is configured as described above.

Next, the operation of this embodiment will be explained. When in operation, tape switch 21 is energized but not conductive. Now, suppose that the movable body 15 moves in the direction of the arrow 34 due to the rotation of the feed screw 13 and reaches the position within the movement restriction range.
9, the contact 27 rotates clockwise, and when the movable body 15 moves further, the sliding contact piece 29 bends, and due to its elasticity, the pressing part 28 sufficiently presses the tape switch 21 to conduct the current. As a result, a process is taken to stop the drive body 16 that is rotating the feed screw body 13, and the movable body 15 is stopped.
Incidentally, a plurality of tape switches may be provided so that they are always conductive and when they come into contact, they are disconnected.

[Effect of idea]

As detailed above, since the limit switch mechanism of the present invention uses a tape switch, when changing the limit range, it is only necessary to change the position of the operating body, and there is no need to change the wiring at all, so changes are extremely easy. It is. Further, since the wiring is provided outside the positioning device, it is easy to install.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a front view of a conventional example. 15...Moving object, 21...Tape switch, 2
2...Movement path, 23...Working body.

Claims (1)

[Scope of utility model registration request] A tape switch is formed in the shape of a tape and conducts when pressed and extends along the moving path of the movable body; and a tape switch is provided near the tape switch and is actuated to conduct when the movable body comes into contact with the tape switch. A limit switch mechanism characterized in that it is equipped with an actuating body that causes electrical disconnection.