JPH1183469A - Apparatus for measuring work size - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of size measurement precision by guiding a work size measuring rod with a guide bush, elevating the work size measuring rod with a cylinder for elevation, and measuring the elevated height with a digital gauge. SOLUTION: A work 1 is set on four reception points of a size measuring jig including standard reception points 2a, 2b of the work in the Z direction and positioned. Compressed air at a prescribed pressure is introduced into the inside of a cylinder 4a-3 for elevation from a nipple 4a-4 of a cylinder for elevating a rod for measuring the work size in the Z-direction. A measuring rod 4a-1 is guided by a guide bush 4a-2 for the measuring rod and the work 1 and the measuring rod 4a-1 are elevated at a preset speed proper to prevent wear and damage and the measuring rod is brought into contact with the parts for measuring the size of the work 1 in the Z-direction. The size of the work 1 in the Z direction can be measured from the elevated height of a probe 4a-5a of a digital gauge 4a-5 moved interlockingly with the measuring rod 4a 1. Difference of measured size and deterioration of size measuring precision can be prevented by the method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a work having a strict size standard, such as a television frame, which minimizes a measurement error at the time of repetitive measurement, and has a flaw in a work measuring section and a dimension measurement contact. The present invention relates to an apparatus for measuring a dimension of a work which suppresses wear of a contact portion of a rod.

[0002]

2. Description of the Related Art For example, products such as television frames are required to have strict dimensional standards and no scratches. In a measuring device for measuring each standard dimension of a conventionally used television frame (hereinafter referred to as a work), a device for measuring a height in a Z direction is a device in which a Z direction dimension measuring rod is moved upward by a force of a compression spring. The work is always lifted, and then the work is set on both sides of the measuring jig with two hands. At this time, the Z-direction dimension measuring rod is pushed down from the upper surface of the rod by the weight of the work. The lower surface of the pushed-down Z-direction dimension measuring rod was measured for drop by a commercially available digital gauge to measure the dimension.

[0003]

However, in the above-described method, the Z which is pushed up by the force of the compression spring is used.
If the speed at which the work is set on the upper surface of the dimensional measurement rod with both hands and the Z-direction measurement rod is pushed down exceeds the digital gauge response limit speed of 600 mm / sec,
There is a problem that a measurement dimension shift occurs due to a slit jump of the digital gauge.

Actually, the work was set on the measuring jig with both hands, and a numerical deviation was tested. As a result, a maximum deviation of 0.01 mm was confirmed in 5 out of 100 measurements.
In addition, when the workpiece to be set is positioned in the left-right direction, the contact portion of the Z-direction dimension measuring rod upper surface is deteriorated in dimension measurement accuracy due to wear during repeated measurement,
Further, at the time of position adjustment, the work may be scratched due to the contact between the measuring rod and the Z-direction dimension measuring portion of the work,
A contact error of the work Z-direction measuring rod occurs due to a decrease in compression pressure of the compression spring, and there is a problem in dimension measurement accuracy at the time of repeated dimension measurement.

Accordingly, the present invention is intended to measure a dimension deviation due to exceeding a response limit speed of a dimension measuring digital gauge and a dimension measurement due to abrasion of a dimension measuring contact rod when measuring a work of a strict dimension standard such as a television frame. It is an object of the present invention to provide a work size measuring device capable of preventing deterioration of accuracy and preventing a contact portion between a work and a rod from being damaged.

[0006]

In order to solve the above-mentioned problems, the present invention provides a work size measuring rod disposed below a measuring portion of a work to be measured, and a vertical movement of the work size measuring rod. And a workpiece dimension measuring rod guide bush for guiding the workpiece dimension measuring rod so that the workpiece dimension measuring rod is lifted at a predetermined speed with a predetermined air pressure so as to contact the workpiece measuring portion. A cylinder for elevating a workpiece dimension measuring rod for at least partially surrounding the rod and supplying compressed air to a lower end thereof, and for measuring a height of elevation of the workpiece dimension measuring rod when contacting the workpiece measuring part. And a work size measuring device characterized by having a digital gauge.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
In the dimension measurement in the Z direction (height direction) in the severe dimension measurement items of each dimension such as a TV frame, the work is set on a work dimension measuring jig, the work is positioned at an appropriate position, and the Z of the work is measured. In the state where the dimension in the direction can be measured, the workpiece Z-direction dimension measuring rod is in a state in which a gap is provided between the workpiece Z-direction dimension measuring unit, that is, when the workpiece Z-direction dimension measuring rod is lowered from the workpiece Z direction. After the dimension can be measured, raise the workpiece Z-direction dimension measuring rod at the appropriate pressure and at the appropriate speed, and contact the Z-direction dimension measuring part of the workpiece at the appropriate pressure and at the appropriate speed. In addition, it is possible to improve the measurement accuracy by preventing the pitch jump of the slit of the digital gauge and preventing the wear of the work and the rod for measuring the dimension in the Z direction. Structure of the device itself is simple.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a work size measuring apparatus of the present invention, FIG. 2 is a cross-sectional view taken along a plane indicated by an arrow A in FIG. 1, and FIG. 4 is an enlarged cross-sectional view taken along a plane indicated by an arrow C in FIG. 1, and FIG. 5 is a circuit diagram of electric and pneumatic components of a work dimension measuring device related to the present invention;
FIG. 6 is a perspective view showing a television frame which is an example of a special work handled by the work size measuring device of the present invention.

First, referring to FIG. 6, there is shown a television frame as an example of a special work to be treated as a measuring object by the work size measuring apparatus of the present invention. Work 1, a television frame, consists of four main parts 1a, 1b, 1c, 1d forming it. The measurement by the work size measuring apparatus of the present invention is performed by measuring the Z from the line connecting two points (reference points in the Z direction) at predetermined distances from the centers of the surfaces 1a-1 and 1b-1 in the portions 1a and 1b. It is obtained by measuring the height in the direction (the difference in height between the line connecting the two points and the center).

Actually, as will be described later, the work 1 is measured in a state in which the work 1 is turned upside down from the state shown in FIG. 6, and the measurement load disposed below the work 1 is moved in the Z direction (specifically, Is to measure the height of the lower end of the measurement load when the measurement rod contacts the surface 1a-1 (or 1b-1) by moving the measurement rod upward.

1 to 3, reference numerals 2a and 2b
Indicates a work equalizing side Z-direction reference point receiver, and reference numerals 3a and 3b indicate work reference side Z-direction reference point receivers (the Z direction with respect to the work is shown in FIGS. 2, 4, and 6). These four work Z-direction reference point receivers 2a, 2a
b, 3a and 3b are arranged at predetermined four places so as to support the surfaces 1a-1 and 1b-1 of the work in accordance with the standard dimensions of the work (FIGS. 2 and 4 show the work reference side Z direction reference). It shows a state in which the point receivers 2a and 2b support the surface 1a-1).

The work equalizing side Z-direction measuring device 4a of the present invention and the surface 1b-1 of the work 1 are supported at the center of the work equalizing Z-direction reference point receivers 2a and 2b supporting the surface 1a-1 of the work 1. The work reference side Z-direction measuring device 4b of the present invention is mounted on the work dimension measuring device base 7 at the center of the work reference side Z-direction reference point receivers 3a and 3b. The work equalizing side Z-direction measuring device 4a
Since the configuration and the operation of the work reference side Z-direction measuring device 4b are the same, the following description may be made only for the work equalizing side Z-direction measuring device 4a.

Further, the work right side Y direction size measuring device 5a, the work left side Y direction size measuring device 5b, and the work equalizing side R at other standardized work size measuring points.
Y (R in Y direction) dimension measuring device 6a and work reference side RY
The dimension measuring device 6b is mounted on the work dimension measuring device surface plate 7.

Further, a left and right work positioning device 8a,
8b is operated by a work left / right positioning lever 9,
When the work left / right positioning lever 9 approaches the work size measurement timing detection proximity switch 10, the measurement jig is operated.

Next, the measuring procedure of the work size measuring apparatus of the present invention will be described with reference to FIGS. The work 1 is placed on a work Z-direction reference point receiver 2a, 2b of a dimension measuring jig.
For example, the workpiece is set on the four receivers 3a and 3b with both hands, and the work positioning lever 9 is pulled with the right hand to perform the left / right positioning of the work on the work Z-direction reference point receiver. That is, the left and right positioning devices 8a and 8b are operated to adjust the center of the work to the fixed position of the measuring jig as indicated by the arrow.

At this time, the work size measurement detection switch 1
0 (FIG. 1), that is, the switch PXS10 (FIG. 5) is ON
(ON), but the work size measurement timing timer T
Until R is turned ON, the work Z-direction measuring rod 4a-1 in the sectional view of the main part of the work Z-direction dimension measuring device in FIG.
It is in a state of falling by its own weight.

Thereafter (after 2 seconds), when the work size measurement timing timer TR shown in FIG.
1 is closed, the pneumatic solenoid valve SV (direction switching solenoid valve) is excited, its spool (not shown) is moved, the air pressure path is switched from the illustrated position, and the air supply source is passed through the filter 11 and the relief valve 12. The supplied compressed air is supplied to the work equalizing side Z direction measuring device 4a (and the work reference side Z direction measuring device 4b). In addition, what is shown with the code | symbol 13 is a pressure gauge.

For this reason, the workpiece Z is moved from the nipple 4a-4 of the cylinder for measuring the dimension of the workpiece Z in FIG.
Compressed air in which the pressure and the flow rate are set is introduced into the direction dimension measuring rod lifting cylinder 4a-3.

As a result, the workpiece Z-direction dimension measuring rod 4
The workpiece a-1 is guided by the work Z-direction dimension measuring rod guide bush 4a-2, rises at, for example, a pressure of 0.1 kg and a speed of 10 mm / sec, and comes into contact with the workpiece 1 in the Z-direction dimension measuring part ( , These set pressures and speeds do not wear or damage both the workpiece and the rod).

Therefore, the work Z in contact with the work 1
The dimension in the workpiece Z direction by the probe 4a-5a of the digital gauge 4a-5 (specifically, from the height of the rise of the probe 4a-5a of the digital gauge 4a-5) interlocked with the direction dimension measuring rod 4a-1. Can be measured. The probe 4a-5a is urged upward by, for example, a spring (not shown) so as to follow the rising of the lower end of the work Z-direction dimension measuring rod 4a-1.

Next, when the work Z-direction dimension measurement is completed, the work positioning lever is returned with the right hand to turn off the work dimension measurement detection switch 10 in FIG.
(OFF) and the work dimension measurement timing timer TR
Is turned off, the excitation of the pneumatic solenoid valve SV is turned off, the spool returns to the initial position, the pneumatic path is cut off, and the compressed air in the work dimension measuring rod lifting cylinder 4a-3 is released to the atmosphere. become. As a result, the work Z-direction dimension measuring rod 4a-1 descends by its own weight, and returns to the initial state before measurement. With the above operation, the dimension measurement of the work 1 is completed.

[0022]

As described above, according to the work size measuring apparatus of the present invention, when measuring a work of a strict size standard such as a television frame, the work is performed by exceeding the response limit speed of the size measuring digital gauge. Deterioration of dimension measurement accuracy due to dimension deviation and wear of the dimension measurement contact rod can be prevented. In addition, it is also possible to significantly suppress the damage of the contact portion between the work and the rod.

[Brief description of the drawings]

FIG. 1 is a plan view of a work dimension measuring device according to the present invention.

FIG. 2 is a cross-sectional view taken along a plane indicated by an arrow A in FIG.

FIG. 3 is a cross-sectional view taken along a plane indicated by an arrow B in FIG.

FIG. 4 is an enlarged cross-sectional view taken along a plane indicated by an arrow C in FIG.

FIG. 5 is an electric and pneumatic circuit diagram of a work size measuring device related to the present invention.

FIG. 6 is a perspective view showing a television frame which is an example of a special work handled by the work size measuring device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Work 1a, 1b, 1c, 1d Work part 2a, 2b Work equalization side Z direction reference point receiver 3a, 3b Work reference side Z direction reference point receiver 4a Work equalization side Z direction measurement device 4b Work reference side Z direction measurement device 5a Work right dimension measuring device 5b Work left Y dimension measuring device 6a Work equalizing side RY size measuring device 6b Work reference side RY size measuring device 7 Work dimension measuring device surface plate 8a, 8b Work left / right positioning lever 9 Work left / right positioning Lever 10 Work size measurement detection switch 4a-1 Work Z direction size measurement rod 4a-2 Work Z direction size measurement rod guide bush 4a-3 Work Z direction size measurement rod lift cylinder 4a-4 Work Z direction size measurement rod lift Nipple of cylinder 4a-5 Digital Gauge 4a-5a Probe 11 Filter 12 Relief valve 13 Pressure gauge

Claims (2)

[Claims] 1. A work size measuring rod arranged below a measuring portion of a work to be measured, and a work size measurement for guiding the work size measuring rod so that the work size measuring rod can be moved up and down. A rod guide bush, at least partially surrounding the work dimension measuring rod so as to raise the work dimension measuring rod at a predetermined speed at a predetermined air pressure and contact the work measuring portion, and supply compressed air to a lower end thereof And a digital gauge for measuring the height of elevation of the workpiece dimension measuring rod when the workpiece dimension measuring rod comes into contact with the workpiece measuring part. . 2. A work size measurement rod disposed below a measurement portion of a work to be measured, and compressed air is supplied to a lower end of the work size measurement rod to measure the work size at a predetermined speed at a predetermined pressure. Rod elevating means for elevating a rod to come into contact with a workpiece measuring portion; and the workpiece dimension measuring rod when the workpiece dimension measuring contact rod comes into contact with the workpiece measuring portion in conjunction with the elevation of the workpiece dimension measuring rod. A measuring means for measuring the height of rise of the workpiece, and a work dimension measuring device comprising: