JPS5948321B2 - Straight type micrometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear micrometer, and in particular to a frame provided with an anvil, the micrometer is slidably supported on the frame, and the tip of the micrometer is in contact with an object to be measured during measurement. This invention relates to an improvement in a linear micrometer that is equipped with a linearly moving spindle and measures the length of an object to be measured from the linear displacement of the spindle when the object is held between an anvil and the spindle.

A micrometer is a type of length measuring device that measures the length of an object to be measured.

This includes a frame on which an anvil is disposed, and a rotary spindle or a linear spindle which is screwed onto the frame or is slidably supported and whose tip is brought into contact with the object to be measured during measurement. The length of the object to be measured is measured from the displacement of the spindle when the object is held between the anvil and the spindle. Conventionally, the amount of displacement of the rotating spindle with respect to the frame is measured using a sensor formed at the rear end of the rotating spindle. In addition, a so-called mechanical rotary micrometer is mainly used, which reads the feed amount of a precisely machined screw using magnification due to the slope of the screw. However, with this rotary micrometer, the object to be measured must be released by rotating the screw in the opposite direction and retracting the spindle each time a measurement is made. However, the operation of exchanging the object to be measured was extremely troublesome. This has been proposed in recent years with the advancement of electronics.

A frame on which an anvil is arranged, a linear spindle slidably supported by the frame and whose tip abuts the object to be measured during measurement, a fixed scale fixed to the frame, and interlocked with the linear spindle. The length of the object to be measured held between the anvil and the spindle can be determined from changes in physical quantities between the movable scale and the fixed scale due to the linear displacement of the spindle, such as changes in the amount of transmitted light or reflected light. The same applies to so-called electronic linear micrometers that measure . In order to eliminate the above-mentioned drawbacks of this electronic linear micrometer, it is equipped with a frame on which an anvil is disposed, and a frame that is slidably supported on the frame, the tip of which comes into contact with the object to be measured during measurement. A linear spindle, a fixed scale fixed to the frame, and a movable scale interlocked with the spindle. An electronic linear micrometer for measuring the length of a measured object has a reciprocating mechanism for reciprocating the spindle over the entire stroke, and a reciprocating mechanism for locking the reciprocating mechanism at an arbitrary position. a lock mechanism; a constant pressure mechanism for pressing the spindle against the object to be measured with a constant measuring pressure when the reciprocating mechanism is locked by the lock mechanism; It is conceivable to provide a release mechanism for overcoming the pressing force of the constant pressure mechanism and pulling back the spindle by a predetermined stroke to release the object under test. In the above, a slide arm for operating the slider, which constitutes the reciprocating mechanism, and a snuff arm, for operating the opening arm, which constitutes the opening mechanism, are provided on both sides of the micrometer body, over the entire movement range of the spindle. It was necessary to arrange it so that it could be moved across the body, which was inconvenient in terms of processing and operation of the main body.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks of the conventional art, and to regulate the axial movement distance of the spindle to such an extent that the object to be measured can be easily set in or removed from the measurement position. To provide a linear micrometer capable of measuring a large number of objects to be measured of the same standard with a minimum amount of spindle movement.

In the linear micrometer of the present invention, a spindle is slidably supported by a pair of support parts facing each other with a certain gap, and the spindle between the two support parts is in contact with a support part on the anvil side. A connecting piece biased by a spring is loosely fitted into the connecting piece, and a locking member for integrally coupling with the spindle is provided to overcome the biasing forces of the spring and the constant pressure mechanism. The opening mechanism includes an opening operation member for pulling back the spindle.

According to the above configuration, when measuring a large number of objects to be measured of the same standard, first the spindle is moved so that the objects to be measured can be set between the anvil and the spindle by slightly moving the spindle, and the objects to be measured can be set between the anvil and the spindle. The connecting piece is fixed to and the amount of movement thereof is regulated. Then, after operating the connecting piece with your fingers to move the spindle and positioning the object to be measured between the spindle and the anvil, when you release the force of your fingers on the connecting piece, the pressing force from the spring and constant pressure mechanism is immediately applied. Therefore, the spindle moves toward the anvil together with the connecting piece, and its tip abuts against the object to be measured with a constant measuring force. The length of the object to be measured can be measured from the displaced positions of the movable scale and the fixed scale at this time. Next, operate the connecting piece to pull back the spindle to release the pressure on the object to be measured, remove the object to be measured from the measurement position, set the next object to be measured,
Perform the measurement in the same way as last time. When there is no object to be measured between the anvil and the spindle, when you release your finger from the connecting piece, the connecting piece moves until it comes into contact with the support on the anvil side, and in that state, the movement of the spindle toward the anvil is stopped. Therefore, the next object to be measured can be set at the measurement position by a slight movement of the spindle by the connecting piece. Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 3, this embodiment includes a substantially U-shaped frame 10 having an anvil 12 disposed inside the tip, and a tip 14a that is slidably supported by the frame 10K. a linear spindle 14 that is brought into contact with an object to be measured, and a fixed scale that is fixed to the frame 10 and has light transmitting parts and non-light transmitting parts formed in a striped pattern at equal intervals on a glass flat plate. (not shown), and a movable scale (not shown) fixed to the linear spindle 14 and formed of a glass flat plate in which light transmitting parts and non-transmissive parts are formed in a striped pattern at equal intervals, An electronic device that measures the length of an object to be measured based on the displacement of the amount of light passing between the fixed scale and the movable scale due to the linear displacement of the linear spindle 14 when the object is held between the anvil 12 and the tip 14a of the linear spindle 14. In the type of linear micrometer, for example, the linear spindle 14 is used to press the linear spindle 14 against the object to be measured with a constant measuring force during measurement.
When the tip of the linear spindle 14, which is stretched between the linear spindle 14 and a ratchet stop mechanism that is movable along the linear spindle 14 and is operated by a slide control that moves the linear spindle 14, comes into contact with the object to be measured. a constant pressure mechanism (not shown) having a measuring force imparting spring that acts effectively;
A spindle opening mechanism is provided for overcoming the pressing force of the constant pressure mechanism and pulling back the linear spindle 14 by a predetermined stroke A (for example, the stroke of the constant pressure mechanism) with one hand to release the object to be measured. The mechanism includes a connecting piece 18 that is disposed on the spindle support 10a of the frame 10 and is loosely fitted to the linear spindle 14 within a predetermined stroke A, and the connecting piece 18 is connected to the spindle support 10a. a compression spring 20 for contacting the front side of the left-hand threaded contact thread portion 2 which is threadedly engaged with the connecting piece 18 and whose tip can come into contact with the side surface of the linear spindle 14;
2a, and a finger hook recess 2 protruding from the frame surface.
2C (see FIG. 3) and a screw 22 having a head 22b for fixing and opening operations. The compression spring 20 constituting the opening mechanism is designed such that it does not interfere with the operation and handling of the constant pressure mechanism, etc.
The pressing force is said to be extremely weaker than the pressing force of the constant pressure mechanism.

The action will be explained below.

In the measurement, first, a slide control (not shown) or the like is operated to move the linear spindle 14 backward in the direction shown by arrow B in FIG. Then, the tip of the linear spindle 14 is completely retracted and is ready for measurement. Then frame 10
A running object to be measured is interposed between the anvil 12 and the tip 14a of the straight spindle 14, and the straight spindle 14 is advanced in the direction shown by arrow C in FIG. 1 by operating a slide control or the like.
The object to be measured. It is held between the anvil 12 and the tip 14a of the linear spindle 14. At this time, since the linear spindle 14 is urged in the direction of arrow C in FIG. 1 by a constant pressure mechanism (not shown), the measurement is performed with a predetermined measuring force applied. Specifically, by detecting the amount of relative displacement between the movable scale and the fixed scale due to the displacement of the linear spindle 14 with respect to the reference position from the change in the amount of passing light, it is possible to know the amount of change of the movable scale from the reference position. can. Therefore, the amount of displacement of the linear spindle 14 to which the movable scale is fixed can be known, and the length of the object to be measured can be measured. At this time, since the linear spindle 14 is always pressed in the direction of contacting the object to be measured by the constant pressure mechanism, a constant measuring force is always applied regardless of variations in the operator's operating force, ensuring accurate measurements. It is possible. Further, the connecting piece 18 is kept in contact with the front side of the spindle support portion 10a at all times due to the action of the compression spring 20. Therefore, the movement stroke A of the connecting piece 18 is always ensured. Next, when repeatedly measuring the same type of object to be measured, conventionally, a slide saw or the like was operated one by one in the direction shown by arrow B in FIG. After releasing the
The linear spindle 14 had to be inserted between the front end 14a of the linear spindle 14, and the linear spindle 14 had to be moved forward to the measurement state by operating a slide sob, etc., and this operation was extremely troublesome and time consuming. .

In contrast, in the present invention, when repeatedly measuring the same type of object to be measured, it is sufficient to operate only the screw 22 without operating the slide control or the like.

That is, when repeatedly measuring the same type of object, after the first measurement is completed, place your finger in the finger hook recess 22C of the head 22b of the screw 22 as shown in FIG. Slightly rotate in the counterclockwise direction shown by arrow D in Figure 3. Then, since the abutting threaded portion 22a of the screw 22 is a left-handed thread, the screw 22 moves forward in the direction shown by arrow E in FIG.
Its tip abuts against the side surface of the linear spindle 14, so that the linear spindle 14 and the connecting piece 18 are integrated. Then,
If the head 22b of the screw 22 is moved in the direction of arrow B in FIG. 1 against the compression spring 20 and the measuring force applying spring, the connecting piece 1
8 is pulled back together with the linear spindle 14 within a predetermined stroke A in the direction of arrow B in FIG. At this time, the operating force is the resultant force of the force exerted by the compression spring 20 and the force exerted by the measuring force applying spring, but since the compression spring 20 is extremely weak, the operating force does not increase significantly. In this state, when the object to be measured is replaced and the finger is released from the head 22b of the screw 22, the linear spindle 14 moves forward again to the measurement position due to the action of the compression spring 20 and the measuring force applying spring of the constant pressure mechanism, and immediately next time. measurements are taken. Therefore, when repeatedly measuring the same type of object, there is no need to operate the slide sob each time, and by simply operating the screw 22, a minute gap can be easily created to remove the previously measured object. Then, after the object to be measured is inserted next time, the minute gap disappears and a predetermined measuring force is applied.

In this embodiment, the locking member of the opening mechanism and the opening operation member are integrated, so the configuration is simple.

Furthermore, since the locking threaded portion of the locking member is a left-hand thread, it is possible to operate the locking member with one hand using a -action, and the locking member is highly operable. In the above embodiments, the present invention was applied to an electronic linear micrometer that measures the linear displacement of a linear spindle from changes in the amount of light passing between a movable scale and a fixed scale. The range is not limited to this, but it can be measured by an electronic linear micrometer that measures the displacement of the measurement target from changes in the amount of reflected light between the fixed scale and the movable scale, or from changes in other physical quantities between the movable scale and the fixed scale. It is clear that the present invention can be similarly applied to a general linear micrometer that measures the linear displacement of a spindle.

Further, in the above embodiment, the present invention was applied to a micrometer, but the present invention can be similarly applied to length measuring instruments other than micrometers, such as calipers and eight-meter gauges. It is obvious that Z can be done.

As explained above, according to the present invention, a minute gap for removing the previous measured object can be easily obtained without disposing the opening operation member in a movable state over the entire side surface of the micrometer main body. In addition, immediately after inserting the next object to be measured, the minute gap is returned to its original state and a predetermined measuring force is applied, making it extremely easy to repeatedly measure the same type of object.

In addition, since the spindle opening mechanism is arranged on the spindle support part of the frame, the operation of the opening operation member is extremely easy, even one-handed operation is possible, and the connecting piece is biased toward the anvil by the spring. Because of this, it is possible to take your fingers off the spindle or inlet release mechanism during reading, which reduces operator fatigue, which is especially effective when measuring a large number of products of the same standard. becomes.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the main parts of an embodiment of a linear micrometer according to the present invention, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. It is a front view which shows the head shape of the screw which comprises a locking member and an opening operation member. 10...Frame. ．． 10a...Spindle bearing part, 12...Anvil, 14...
... Straight spindle, 18 ... Connection piece, 2
0...Compression spring, 22...Screw, 22
a... Screw part for contact, 22b... Head, 22c... Recessed part for finger hook.

Claims (1)

[Claims] 1. An anvil fixed to a frame, a linear spindle slidably supported by the frame in opposition to the anvil, and a linear spindle that applies a constant measuring force to the object to be measured during measurement. A linear movement device comprising a constant pressure mechanism for pressing and urging, and a moving means such as a knob for moving the spindle forward and backward, and measuring the length of the object to be measured held between the anvil and the spindle from the linear displacement of the spindle. type micrometer, the frame is provided with a pair of support parts that face each other with a certain gap in the axial direction of the spindle and that slidably support the spindle, and the micrometer is moved in the axial direction between the two support parts. a locking member for integrally connecting with the spindle, a connecting piece being loosely fitted onto the spindle and biased by a spring so as to come into contact with the anvil-side support portion; and an opening mechanism for pulling back the spindle by overcoming the biasing forces of the spring and the constant pressure mechanism. 2. A lock in which the locking member and the opening operation member are screwed together with the connecting piece, and a locking screw portion whose tip can come into contact with the spindle side surface and a finger hook recess projecting from the frame surface are formed. 2. The linear micrometer according to claim 1, wherein the linear micrometer is integrally constructed by a screw consisting of a screw and a head for opening operation.