JPH032886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a positioning mechanism that can accurately position the axis of one end of a moving drive shaft.

[Prior Art] A positioning mechanism that can reproduce the same position at the same location in the same state as the previous one is particularly required in precision machinery, and one example is a mechanical optical switch that directly mechanically switches the optical path of an optical fiber. can be mentioned.

Mechanical optical switches employ a two-position positioning mechanism that allows a reflector such as a reflective mirror or prism to protrude onto the optical path. This only concerns whether the reflector placed above can be reproduced on the optical path in the same state as before, and the position repeatability of the reflector that is retracted from the optical path when the drive shaft is not operating is No questions asked.

Therefore, it is an object of the present invention to provide a positioning mechanism with good reproducibility, which is suitable for use in devices and parts that require precision only when the driving means is in operation or not in operation. It is an object.

[Means for Solving the Problems] Therefore, the positioning mechanism according to the present invention includes a fixed base 4, a rod-shaped drive rod 2 that passes through the base 4 and is movable in the axial direction, and a drive rod 2 that is movable in the axial direction. base 4
a bearing 5 of the drive rod 2 provided on the drive rod 2; and a moved member 10 provided on the one end 2a of the drive rod 2.
Convex portions 3a and 3b are provided coaxially with the other end portion 2b of the drive rod 2 and on opposing portions with the drive rod 2 at the center.
The position block 3 is formed with the base lower surface 4.
b, and the convex portions 3a, 3 of the position block 3
It is characterized in that it is provided with a stopper 7 in which the recesses 7a and 7b fit into the movement direction surface of b.

[Operation] The drive rod 2 is moved upward in the axial direction by the drive means 6 connected to the lower end 2b of the drive rod.

Immediately before the drive rod 2 stops at the upper position, the protrusions 3a and 3b of the flange 3 fit into the recesses 7a and 7b of the stopper 7 provided on the lower surface 4b of the base. Therefore, when the drive rod 2 stops at the upper position, the flange 3 is angled, and the drive rod 2 that is concentric with the flange 3 has an upper end 2a, which is one end of the drive rod, separated from the base upper surface 4a. It can always protrude to the same location, and the moved member 10 on the drive rod upper end 2a is accurately positioned.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an exploded perspective view showing the positioning mechanism 1. FIG. A position block 3 is provided at the lower end 2b of the long rod-shaped drive rod 2. This position block 3
Wedge-shaped protrusions 3a and 3b are formed at symmetrical positions with respect to the drive rod 2, respectively, with upper edges 3c and 3d facing upward.

The drive rod 2, which is concentrically integrated with the position block 3, is
The base is fitted from below into a bearing 5 embedded in a fixed base 4 constituting the chassis of the positioning mechanism 1, and is operated by an operating piece 6a of a drive means 6 comprising an electromagnetic coil or the like connected to the lower end 2b of the drive rod 2. 4
It is freely movable in the vertical direction, and its upward movement is restricted by the position block 3.

A stopper 7 is provided on the lower surface 4b of the base, directly below the protrusions 3a, 3b of the position block 3, such that the recesses 7a, 7b thereof face each other.

This stopper 7 is provided with recesses 3a and 3b corresponding to the positions of the wedges of the protrusions 3a and 3b. Part 3
The upper edges 3c, 3d of the upper edges 3c, 3d of the stopper 7 and the apexes 7c, 7d of the recesses 7a, 7b of the stopper 7 are shaped to be inclined outward from the center of the position block 3 and the stopper 7, respectively.

At the upper end 2a of the drive rod 2, a moved member 10 that requires precision to be reproduced at the same location when the drive rod 2 is positioned above is placed or fixed.

Next, the operation of the positioning mechanism 1 having the above-described structure will be explained based on the operation diagrams shown in FIGS. 2a and 2b as seen from the side.

In the state shown in FIG. 2a, the drive rod 2 is stopped at the lower position. Also, at this time, the convex portions 3a, 3b of the position block 3 are connected to the concave portions 7a, 7b of the stopper 7.
It is located below.

When the actuating piece 6a of the driving means 6 is about to move upward as shown in the state of FIG. 2b, the driving rod 2
are the convex portions 3a, 3 of the position block 3 of the lower end portion 2b.
b enters the recesses 7a and 7b of the stopper 7 provided on the lower surface 4b of the base, and the drive rod 2 moves upward in the axial direction while movement of the drive rod 2 in the rotational direction is restricted. At this time, if a suction type electromagnetic coil using a return spring or the like is used as the drive means 6, the drive rod 2 can be moved upward in either operating or non-operating state, and is not particularly limited. is the upper position and the lower position
One that moves in position is desirable.

When the drive rod 2 stops at the upper position, the convex portion 3 of the position block as shown in the partially enlarged perspective view of FIG.
The upper edge 3c of the stopper 7 is in contact with the apex 7c of the recess 7a of the stopper 7, and the position block 3 and the drive rod 2
The drive rod 2 can always be positioned at the same angle, and the rotational direction of the drive rod 2 is automatically adjusted, and the axial direction is also automatically positioned.

Therefore, the upper end 2a of the drive rod 2 can protrude at the same angle at the same location, and the member 10 to be moved on the upper end 2a of the drive rod is accurately positioned at a predetermined distance upward position each time the drive rod 2 moves. can.

Such a positioning mechanism 1 can be used, for example, as a switch mechanism for an optical system, and is particularly suitable for a mechanical optical switch. In other words, if the reflector 10 is placed as a moving member on the upper end 2a of the drive rod 2, the optical path can be switched so that the reflector 10 protrudes onto the optical path by upward movement of the drive rod 2, and the mechanical The position reproducibility of the reflector 10 required for an optical switch can be ensured.

Alternatively, the position block 3 may be provided with a protrusion having a recess, and the stopper 7 may be provided with a protrusion corresponding to the recess.

Further, the convex portion and the concave portion that fits therein may have a trapezoidal shape or a circular shape and a shape that fits therein other than the wedge shape.

Also, instead of the stopper 7, the lower surface 4b of the base 4 can be directly installed.
The recesses 7a and 7b may be formed by cutting.

[Effect of the invention] As explained above, according to the positioning mechanism according to the invention, when the moved member moves a predetermined distance,
The member to be moved can always be positioned at the same angle and at the same location, which has the effect of allowing precise positioning.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a positioning mechanism according to the present invention, FIGS. 2a and 2b are explanatory diagrams of the operation of the same mechanism, and FIG. 3 is a partially enlarged perspective view of the same mechanism. DESCRIPTION OF SYMBOLS 1...Positioning mechanism, 2...Drive rod, 3...Position block, 3a, 3b...Protrusion, 3c, 3d...
...Upper edge, 4...Base, 5...Bearing, 6...Driving means, 7...Stopper, 7a, 7b...Recess, 7c, 7d...Vertex, 10...Moved member.

Claims (1)

[Claims for Utility Model Registration] A fixed base 4; A drive rod 2 formed in a rod shape passing through the base 4 and movable in the axial direction; A bearing 5 for the drive rod 2 provided on the base 4.
and; a moved member 10 provided on one end 2a of the drive rod 2; and a convex portion 3a coaxially with the other end 2b of the drive rod 2 and opposite to the drive rod 2, respectively. , 3b are formed on the lower surface 4b of the base, and the concave portion 7 is provided on the movement direction surface of the convex portions 3a, 3b of the position block 3.
A positioning mechanism characterized by comprising a stopper 7 into which parts a and 7b fit.