JPH0134084Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spindle lift in a measuring instrument such as a linear gauge or a dial gauge.

First, the known ones will be briefly explained.

In FIG. 1, the measuring instrument includes a spindle 2 that is movably supported on a sleeve 11 of the housing 1 with one end protruding from the bottom of the housing 1, a protrusion horizontally projected from the spindle 2, and a housing 1. It consists of a spring 3, each end of which is fixed between protrusions provided below to constantly apply a pushing force to the spindle 2 in the protrusion direction, and a spindle movement amount detector 40. Note that the movement amount detector 40 in the linear gauge shown in the figure is a long slit plate 41 that is integrally fixed to the spindle 2.
A fixed slit plate (not shown) is fixed to the casing 1 to face the slit plate 41 at an appropriate intersecting angle, and a fixed slit plate (not shown) is fixed to the casing 1 to face the slit plate 41 with both slit plates sandwiched therebetween. Two fixed pairs of light sources 4
2 and 43 and a light receiving element (not shown), and is configured to photoelectrically detect moiré fringes between both slit plates that move in accordance with the movement of the spindle 2.

In this type of measurement, first, the housing 1 is fixed to a holder, and the tip of the spindle 2 is brought into contact with the base. In this state, the measuring device into which the output of the movement amount detector 40 is introduced is reset to zero. Next, the spindle 2 is lifted, the object to be measured is placed on the base, the spindle 2 is pressed onto the object to be measured, and in this state, the measurement value of the measuring device is read. Thereafter, the spindle is lifted again and the object to be measured is removed from the base. The above is one repeated operation for measurement.

Now, in this measurement, it is necessary to lift the spindle 2 in order to carry the object to be measured onto the base, and if this is done manually, there is a risk that excessive force will be applied to the measuring instrument. , the initial holding state of the measuring instrument will shift. In order to avoid this, the spindle lift mechanism 50 is provided. One end is rotatably supported by the housing 1, the needle part 53 of the release 52 inserted into the housing 1 is brought into contact with the side, and the protrusion of the needle part 53 causes the open end side to be attached to the spindle 2. a lift arm 51 that is rotated in the axial direction of the spindle 2, and a protrusion 21 that projects horizontally from the spindle 2.
and a protrusion 54 that protrudes from the open end of the lift arm 51 in a direction perpendicular to the plane of the paper so as to come into contact with the lower side of the protrusion 21. In the above, when the operating section (not shown) at the other end of the release 52 is pressed, the needle section 53 protrudes.
As a result, the left open end of the lift arm 51 moves upward, and its protrusion 54 engages with the protrusion 21 of the spindle 2, so that the spindle 2 is lifted upward. Therefore, the lifting height of this spindle lift mechanism 50 is determined by the length between the center of rotation of the lift arm 51 and the protrusion 54 on the open end side. Therefore, the length of the lift arm is determined according to the stroke of the measuring instrument, and a long measuring instrument inevitably increases in size. Furthermore, in such a case, the operating force at the operating section of the release 52 must be increased accordingly, and as a result, using this lift mechanism 50 for a long measuring instrument poses a problem in terms of operability.

However, when considering the usage conditions of a long dimension measuring instrument, it is not only necessary to measure measurements where the dimensions of the object to be measured vary over the entire stroke of the spindle; In some applications, a portion of the stroke may be within a close range centered around another location of the stroke. In this case, if the height of the object to be measured is high, the spindle must be lifted to a high position each time, which has the disadvantage of poor operability as described above. By the way, in this case, it is not necessary to make the movement range of the spindle 2 the entire stroke, and only a part of the stroke is used at a certain height. Therefore, if this initial height can be changed and the spindle can be lifted within a predetermined range from each initial height, the function as a spindle lift can be fully fulfilled in the above measurement method. Become.

The present invention is based on the results of the above studies, and includes a lift arm whose one end is rotatably supported and whose open end is rotated in the axial direction of the spindle by the protrusion of the needle of the release inserted into the housing; The present invention provides a spindle lift mechanism consisting of a ball clutch that is engaged with the open end of the lift arm and selectively connects and disconnects the spindle depending on the rotational angular position of the lift arm. The spindle is held at a suitable height in the released state, and under that condition the lift arm is rotated, thereby causing the ball clutch engaged with its open end to engage with the spindle, so that the spindle It is designed so that it can be raised from that position by the rotational height of .

Hereinafter, embodiments of the present invention will be described in detail.

In FIGS. 2 and 3, a housing 1, a spindle 2, an extrusion spring 3, a movement amount detector 40 indicated by elements 41 to 43, a release 52, and a needle portion 53 thereof, which are given the same numbers as in FIG. , the lift arm 51 is similar to that shown in FIG. 1, and wired in the same manner. However, the protrusion 54' fixed to the open end of the lift arm 51 is different from the protrusion 54 in FIG.
It is an oval shape with long left and right sides. The ball clutch 60 includes first and second cylindrical bodies 64 and 67, first and second springs 68 and 69, and a ball 70. The first cylindrical body 64 has an upwardly widening taper 61 formed on the inside near the center, an arm 63 protruding from the outside to the left, and a semi-circular cross section 6 at the bottom of the cylindrical body.
2, and the spindle 2 is passed through the cylinder through holes bored in the top and bottom walls of the cylinder. The second cylindrical body 67 is disposed within the first cylindrical body 64 and has an outer diameter slightly smaller than the minimum inner diameter of the taper 61 of the first cylindrical body 64.
At the same time, the spindle 2 is inserted into the hollow hole, and an arm 65 is protruded to the left on the left outer circumferential portion thereof, facing below the arm 63. Both arms 63, 65
A protrusion 54' of the lift arm 51 is located between them. Further, a second spring 69 is provided between the bottom of the second cylindrical body 67 and the bottom inner wall of the first cylindrical body 64;
A ball 70 is arranged at the top of the first cylinder 67, and a washer 71 inserted through the spindle 2 is in contact with the ball 70, and there is a space between the top surface of the washer 71 and the top inner wall of the first cylinder 64. A first spring 68 is interposed in each case. The repulsive force of the second spring 69 is slightly larger than that of the first spring 68, and as a result, the top of the second cylindrical body 67 has a taper 61.
It's going inside.

In the above system, when the needle portion 53 of the release 52 is projected into the housing 1 from the state shown in FIG. As a result, protrusion 5
4' increases in the vertical direction, and a force is applied to move the arm 63 upward and the arm 65 downward, and as a result, the second spring 69 is compressed, and the second spring 69 is compressed. The cylindrical body 67 is moved downward, so that the ball 70 enters the small diameter side of the taper 61,
The taper 61 and the spindle 2 are locked. Thereafter, by rotating the lift arm 51, the ball clutch 60 is raised while being integrated with the spindle 2 (FIG. 3).

Next, when the needle portion 53 of the release 52 is retreated from this state, the spindle 2 is moved to the ball clutch 6.
While being locked at zero, the lift arm 51 descends as the lift arm 51 rotates downward. Then, when the distance in the vertical direction of the projection 54' of the lift arm 51 becomes small again as shown in FIG. The spindle 2 is moved and the lock state with the taper 61 of the spindle 2 is released.

Now, when measuring dimensions, the tip of the spindle 2 is brought into contact with the base, the measuring device into which the output of the movement amount detector 40 is introduced is reset to zero, and then,
From that state (FIG. 2), the needle portion 53 of the release 52
is projected, and the spindle 2 is raised in the same manner as described above.Then, the object to be measured is placed on the base, and the needle portion 53 of the release 52 is retracted to the initial state. Then, the lift arm 51 rotates downward, and accordingly, the ball clutch 60 and the spindle 2 locked thereto descend together. When the tip of the spindle 2 comes into contact with the upper surface of the object to be measured, a downward force from the arm 63 and an upward force from the arm 65 are applied to the protrusion 54' by the repulsive force of the second spring 69, respectively. As a result of the difference in the point of application of each force, that is, the former is located to the right relative to the latter, the lift arm 51 is rotated downward, and the top of the second cylindrical body 67 protrudes into the taper 61. The ball 70 is moved upward so that the first cylinder 64
The lock state between the ball clutch 60 and the spindle 2 is released, and the lift arm 51 rotates downward while being integrated with the ball clutch 60 (sliding in the lateral direction at the engagement part), and the lower left end of the lift arm 51 is rotated downward. It stops in the state shown in FIG. 2 when it comes into contact with the housing 1. Under this state, the spindle 2 and the ball clutch 60 are released, and a predetermined pushing force is applied by the push-out spring 3 onto the object to be measured. Therefore, read the measured value of the measuring device at this time.

Next, when removing the object to be measured from the base, the needle portion of the release 52 is made to protrude again and the lift arm 51 is rotated. Then, the spindle 2 is locked to the ball clutch 60 in the same manner as described above, and the spindle 2 is lifted upward by a height corresponding to the rotation angle of the lift arm 51.
Therefore, the total lifting height of the spindle 2 at this time is the sum of the height of the object to be measured and the stroke of the lift arm. Thereafter, under this condition, the object to be measured on the base is replaced with another object to be measured, and the same measurements as described above are repeated.

In the above embodiment, the downward rotation of the lift arm 51 after the tip of the spindle 2 comes into contact with the object to be measured is caused by the difference in spring force between the first and second springs 68 and 69. I gave an example of a case where
The same effect can be achieved even if a tension spring is connected between the first cylinder 64 or the lift arm 51 and the lower part of the housing 1, and the tension is generated by the spring.

As described above, the present invention engages the lift arm and the ball clutch, and selectively connects and disconnects the ball clutch and the spindle depending on the rotation angle position of the lift arm. The spindle can be further lifted by the stroke, making it easy to replace the object to be measured.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a conventional device, and FIGS. 2 and 3 are partially sectional front views showing an embodiment of the present invention. 51...Lift arm, 54'...Protrusion, 60
... Ball clutch, 64, 67 ... Housing, 70
...Ball, 68, 69...Spring.

Claims (1)

[Scope of utility model registration request] This is a spindle lift for a length measuring device, which consists of a spindle with one end protruding from the housing and movably supported by the housing, a spring that constantly extracts the spindle in the protruding direction, and a spindle travel amount detector. is rotatably supported by the housing, and the open end of the release arm is rotated in the axial direction of the spindle by the protrusion of the needle of the release inserted into the housing, and the lift arm is engaged with the open end of the lift arm. , a spindle lift for a measuring instrument consisting of a ball clutch that selectively engages and engages the spindle depending on the rotational angular position of the lift arm.