JPS5881Y2 - micrometer head - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a micrometer head for measuring the amount of movement of a mounting table or the like of a projection inspection machine.

Some conventional micrometer heads are designed so that when the operating knob is rotated to move the spindle into the micrometer body to its maximum extent, the inner end of the spindle comes into contact with a rotating member that is integrated with the operating knob. .

In this micrometer Rad, when the spindle is rapidly inserted into the micrometer body, the inner end of the spindle collides with the rotating member, and this impact applies unreasonable force to the threaded part of the feed screw. On the other hand, there was a problem that the inner end of the spindle bit into the rotating member, making it impossible to turn the operating knob smoothly with a small amount of force during the next measurement. .

The present invention provides a micrometer head that solves these problems, and is characterized by an elastic ring made of an elastic member interposed in the part where the spindle collides with the rotating member on the micrometer body side. That is.

An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a cylindrical micrometer main body, and a small-diameter spindle holding portion 1a is formed at one end thereof.

An outer cylinder 2 fitted onto the outer periphery of the micrometer main body 1 is fixed with a set screw 3.

An end plate 4 is fixed to the other end (right end in the figure) of the micrometer main body 1 with screws (not shown).

A shaft portion 6a of a feed screw 6 is rotatably fitted into a cylindrical bearing metal 5 fixed to the center portion of the end plate 4.

A movement restricting flange 7 that comes into contact with the inner surface of the bearing metal 5 is protruded on the left side of the shaft portion 6a, and a movement restricting nut 8 and a lock nut 9 are provided on the threaded portion 6b formed on the right side of the shaft portion 6a. are screwed together.

The movement restriction 7 flange 7 and the movement restriction nut 8 contact the bearing metal 5 to restrict displacement of the feed screw 6 in its axial direction.

A cylindrical body mounting flange 10 and an operation knob 11 are integrally fixed to the outer end of the feed screw 6, and a rotary cylinder 12 is integrally provided on the cylindrical body mounting flange 10.

13 is a spindle.

This spindle 13 has a female screw tube 15 screwed onto the outer periphery of the feed screw portion 14 of the feed screw 6, and one end fixed to the female screw tube 15 and the other end slidably fitted into the spindle holding portion 1a. A hard tip 18 made of cemented carbide is affixed to the head of a bolt 17 which is formed into a rod shape by the fitted tip attachment tube 16 and is screwed into the tip of the tip attachment tube 16.

A spring locking cylinder 19 is fixed to the outer periphery of the inner end of the chip mounting cylinder 16 with screws 20 .

A compression coil spring 21 is interposed between the spring locking cylinder 19 and the stepped surface 20 of the spindle holding portion 1a.
The spindle 13 is urged toward the end plate 4 side.

A key groove 22 extending in the axial direction is formed on the outer circumferential surface of the tip mounting cylinder 16, and a tip portion 23a of a screw 23 screwed into the spindle holding cylinder 1a is inserted into this key groove 22.
are fitted.

A retaining groove 24 having an arc-shaped cross section is formed in the shaft portion of the feed screw 6 adjacent to the left side of the movement regulating flange. An elastic ring 25 having ring-shaped elasticity is fitted therein.

Note that this elastic ring 25 does not necessarily have to be made of rubber or the like, and a spring washer, a disc spring, or the like may be used.

Next, the operation of the micrometer head having such a configuration will be explained.

Rotation of the spindle 13 in the circumferential direction is restricted, so when the operating knob 11 is rotated, the spindle 13
moves forward and backward in the direction of its axis.

When the spindle 13 is moved into the micrometer main body 1 to the maximum extent by operating the operating knob 11, the end of the female threaded cylinder 15 of the spindle 13 comes into contact with the elastic ring 24.

At this time, when the spindle 13 is suddenly displaced, the female threaded cylinder 15 collides with the elastic ring 25, and the impact is absorbed, and at the same time, biting into the movement restriction flange 7 is prevented.

As explained above, in the present invention, an elastic ring made of an elastic material is interposed at the part where the rotating member on the micrometer body side collides with the spindle that protrudes and retracts from the inside of the micrometer body. When stored in the meter body to its maximum capacity, the elastic ring absorbs impact force and prevents excessive force from being applied to the threaded part of the feed screw.Moreover, this elastic ring has a movement-restricting flange at the inner end of the spindle. Since the spindle is well prevented from being bitten by the micrometer body, the operation knob can be turned smoothly with a small amount of force after the spindle is housed in the micrometer body to its maximum extent.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. 1...Micrometer head, 6...
Feed screw, 7...Movement restriction flange, 13...
...Spindle, 25...Elastic ring.

Claims (1)

[Scope of utility model registration request] A feed screw is rotatably held in the micrometer head body, a flange is provided protruding from the outer periphery of the intermediate portion of the feed screw, and a spindle is screwed into the feed screw so as to move forward and backward on the axis of the feed screw with respect to the flange. , the spindle is held in the micrometer body so as to be slidable in the axial direction without rotating;
A micrometer head characterized in that an elastic ring is interposed between the flange and an end surface of the spindle facing the flange.