JPH0520968Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a dimension measuring device for measuring dimensions such as hole diameters.

<Prior art> This type of dimension measuring device is elastically supported by at least a pair of movable members supported so as to be openable and closable in a direction substantially perpendicular to the direction of movement. A measuring element is provided, and a relative displacement between the measuring element and the movable member is detected by a detector.

<Problems to be solved by the invention> However, when such a dimension measuring device is used to measure the hole diameter, when inserting the gauge head into the object to be measured, the gauge head may scratch the object to be measured. In order to prevent this, an air cylinder or the like is used to pull the probe in a direction away from the measuring surface and retract it to a position where the probe does not interfere with the object to be measured. For this reason, when the retraction is released, there is a fear that the measuring tip elastically supported by the movable member will hit the object to be measured and leave a mark.

In addition, since the sensor head is retracted by an air cylinder, even if the air supplied to the air cylinder is stopped, there is a delay in response due to the air, so the retract of the sensor head is not released immediately and the sensor head is not retracted. I had a problem that took time.

<Means for Solving the Problems> In order to solve the above problems, the present invention includes a shaft located between the movable members and supported in the advancing and retracting direction by the measuring head body, and having a tapered portion at the tip; It is characterized by comprising a locking member attached to the end of the shaft that limits forward and backward movement, and an abutment member attached to the movable member and holding the tapered portion.

<Function> When the locking part provided at the end of the shaft restricts the forward and backward movement of the shaft while the abutment member attached to the movable member holds the tapered part of the shaft, the tapered part of the shaft and A gap is created between the abutting members, allowing measurement with the probe.

<Examples> Examples of the present invention will be described below based on the drawings.

FIG. 1 is a side view showing the entire dimension measuring device of the present invention, which is mainly composed of a measuring head 10, a bed 20, a column 21, and a mounting base 30.

The measuring head 10 is attached integrally to a support 11, which is supported by a cylinder 12 for raising and lowering the head.
The probe is suspended from a probe support base 15 via a guide lock 13 so as to be movable up and down.

A column 21 for supporting the probe support 15 and a mounting base 30 for supporting the object W to be measured are fixed on the bed 20.

The internal structure of the measuring head 10 will be explained based on the sectional view of FIG. 2.

Reference numeral 50 denotes a measuring head main body which also serves as a casing, and is a cylindrical body concentric with the shaft 51. Inside the measuring head main body 50, an integrated lever 61 with a notch 60 is connected to a movable member 62 and a bolt B1.
Connected by B2. A measuring element 63 is attached to each tip of the lever 61. Further, the convex portion 64 of the lever 61 is provided with bolts B3 and B4 for adjusting the protrusion of the measuring element 63.

Further, one end of the movable member 62 is fixed to one end of a U-shaped spring U by a bolt B5, and the other end of this U-shaped spring U is fixed to the measuring head main body 50.

A detector 75 consisting of a coil 70 and a core 71 is attached to the movable member 62, and outputs a detection signal according to the relative displacement between both movable members 62.

Reference numeral 65 denotes an adjustment member having an L-shaped notch 66, one end of which is fixed to the movable member 62 with a bolt B7, and the other end of which is a pin (abutting member) 67 that follows the tapered portion T of the shaft 51. is provided. Further, one side of this adjusting member 65 has a measuring element 6.
A bolt B8 for adjusting the retraction amount of No. 3 is provided. By operating this bolt B8, pin 6
You can adjust the spacing between 7.

The shaft 51 has a flange 68 and a lid 69.
A spring S1 is provided between them. This spring S1 positions the shaft 51 at a position where the flange 68 and the measuring head main body 50 are in contact with each other except during measurement, so that the measuring element 63 and the object W to be measured do not interfere with each other. Also, this shaft 5
A dog (locking member) 81 is provided at one end of the measuring head support 15 to come into contact with a fixed end 80 fixed to the measuring head support 15.

In the above configuration, the measurement head 10 before measurement
This state is at the rising end as shown in FIG. 1, and at this time, the probe 63 is in a retracted state as shown in FIG. Accordingly, when inserting the measuring head 10 into the object W to be measured, the cylinder 12 lowers the measuring head 10 in the direction of arrow A in FIG. Next, when the fixed end 80 fixed to the measuring head support 15 and the dog 81 at the end of the shaft 51 come into contact with each other, the dog 8
1 and the shaft 51 that is integral therewith stop moving. Then, as shown in FIG. 3, the shaft 51 is pulled out, and the pin 67 holding the shaft 51 is displaced following the tapered portion T of the shaft 51, and the amount of retraction decreases, causing the contact point 63 and the object W to be comes into contact. Then, when the measuring head 10 further descends, the spring S2 causes the pair of movable members 62 to expand, using the U-shaped spring U as a fulcrum, the measuring stylus 63 approaches the object W, and the tapered portion T and the pin 67 A gap ε is created between them, allowing measurement.

By reading the detection output of the detector 75 in this state, the hole diameter of the measurement hole is measured.

Although the above embodiment is an example of measuring the inner diameter, the present invention is not limited to this, and by making changes such as making the probe 63 face inward and moving the movable member in the opposite direction, it is possible to measure the outer diameter. is also available.

<Effects of the invention> As described above, the invention includes a shaft that is located between the movable members and is supported in the advancing and retracting direction by the measuring head body and has a tapered portion at the tip, and a shaft that is attached to the movable member and holds the tapered portion. By moving the shaft forward and backward when inserting the probe into the object to be measured, the tapered part allows the probe to gradually come into contact with the measuring surface of the object, thereby preventing scratches or bumps on the object. It has the advantage of not leaving any marks.

Another advantage is that the measuring head can be retracted and retracted during the movement of the measurement head and the movement of the shaft, thereby shortening the measurement time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the internal structure of the measuring head, and FIG. 3 is a diagram for explaining the positional relationship between the shaft and the pin. 10... Measuring head, 51... Shaft, 75
...Detector, 80...Fixed end, 81...Dog, T
...Tapered part, W...Measurement object.

Claims (1)

[Scope of utility model registration request] a measuring head main body supported so as to be movable forward and backward relative to the object to be measured; at least a pair of movable members supported within the measuring head main body so as to be openable and closable in a direction substantially perpendicular to the direction of forward and backward movement; and a distal end. a measuring element supported on each of the movable members in the opening/closing direction of the movable member; and a detector for detecting relative displacement between the measuring element and the movable member. a shaft located between the movable members and supported in the forward and backward directions by the measuring head and having a tapered portion at its tip; and a locking member attached to the end of the shaft that comes into contact with the fixed end and limits the forward and backward movement of the shaft. A dimension measuring device comprising: a stop member; and an abutment member attached to the movable member and sandwiching the tapered portion.