JPH0565006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application> The present invention relates to an apparatus for efficiently measuring the cylindricity, pitch, and lead of the effective diameter of a screw continuously and simultaneously.

<Prior art> Conventionally, screws have been measured using a three-dimensional coordinate measuring machine or a dedicated lead measuring machine, but the above items cannot be measured simultaneously and continuously, and the measurement takes time and effort. There were some drawbacks that required it. The present invention does this automatically.

<Embodiment of the present invention> In the figure, a rotating part 2 is provided on a base 1. As shown in FIG.
This is rotated by a motor 6, and its rotation angle is detected by a detector 4. An inclination adjustment table 3 is mounted on the rotating part 2 to make the screw 26 to be measured stand upright and to align the rotating part and the screw coaxially. As a result, the rotation center of the rotary portion and the screw shaft center line of the screw 26 are accurately aligned, and the screw 26 stands upright, and rotates at a constant speed.

The mechanism on the upper right side of the screw 26 presses the contact 23 into the groove of the screw and detects the displacement of the contact in the vertical direction (referred to as the Z direction) and the radial direction (referred to as the X direction) when the screw rotates. This is the mechanism.

A slide member 7 in the X direction is placed on the base 1, and a feed screw 8 and a slide amount detector 9 adjust the position of the entire detection means in the X direction. A Z direction guide 11 is attached to the X slide member 7,
A Z slide member 10 is provided to move in the Z direction accordingly. This is moved in the Z direction by the feed screw 12 by rotation of a motor 13 attached to the X slide member 7. Z direction slide member 1
0 has a first fulcrum 14, on which a first lever 15 having a horizontal T-shape is pivotally supported. and the first
A first detector 16, for example a differential transformer, is provided between the lever 15 and the Z slide member 10 to detect the deflection of the first lever. And the first lever 15 is in Z
In order to take a stable relative position with respect to the slide member 10, it is restricted from above and below by coil springs 22. The first lever is in a position horizontal to the fulcrum 14, and the second
A second lever 18 is attached perpendicularly to this fulcrum. A contact 23 is provided at the bottom of the second lever 18 so as to protrude in the X direction, and a second detector is provided between the top of the second lever 18 and the first lever 15 to detect the displacement of the contact in the X direction. 19, and insert the pressure measuring spring 24 between the first and second levers. In addition, the scale 20 is lowered from the top of the X slide member 7, and the reading head 21 of the scale is
is provided on the upper part of the first lever 15. Note that reading is possible without contact between the scale 20 and the reading head 21.

<Function and measurement operation> In the above structure, the X slide member 7 is advanced to the left by turning the feed screw 8, and the position of the contact 23 is adjusted by the motors 6 and 13, and the contact is inserted into the groove of the screw. Insert with constant pressure measurement.

Here, in order to align the horizontal rod portion of the first lever 15 with the X direction and always press the contact from the X direction, the output of the first detector 16 is always controlled to a constant value (for example, zero point). The rotation of the motor 13 is controlled. Then, the screw shaft 26 is
When the contactor 23 is rotated, pressure is applied by the spring 24 to move in the Z direction along the thread groove, and the first lever rotates about the fulcrum 14. Therefore, the motor 13 is rotated by the output of the first detector 16 to cause the position of the fulcrum 14 to follow the thread groove. That is, when the shaft rotates, the slide member 10 is moved so that the contact 23 always comes into contact from the X direction.
Move by Z. The amount of movement is then output as a detection value of the reading head 21 of the scale 20. The first lever 15 to which the reading head is attached is controlled to always maintain its orientation, so the relationship between the scale 20 and the head 21 is such that a constant distance is maintained and there is resistance to the operation of the first lever 15. To read the Z position of a contactor 23 over a wide range without adding At the same time, the displacement of the contact in the X direction is detected by a second detector 19. Therefore, the lead is detected from the relationship between the rotation angle of the screw shaft of the rotation angle detector 4 and the amount of displacement in the Z direction detected by the reading head 21, and the cylindricity is determined based on the rotation angle and the output of the second detector 19. Concentricity can be detected.

In addition, by setting the master piece on the table and storing the detection values of the X slide amount detectors 9 and 19, and reading the detection values of the detectors 9 and 19 of the thread to be measured, it is possible to determine the effectiveness of the screw. Diameter can be measured.

The cylindricity, lead, etc. are read by the detector as described above, but the pitch can be determined from the output value of the detector by additionally using a separate arithmetic device.

<Other embodiments> By installing the guide 11 in the Z direction so that the inclination corresponds to the inclination angle of the tapered screw, or by installing the guide 11 in the Z direction to match the inclination angle of the tapered screw,
It is also possible to measure a tapered screw by controlling the feed screw 8 by a motor (not shown) so as to keep the output of the X-slide member 9 constant and moving the X slide member 7 at a predetermined speed.

<Effects> As described above, in the present invention, after setting the apparatus, it is possible to perform measurements with high precision and in a short time fully automatically according to the desired measurement items on the recording paper.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing the configuration of the present invention. 2: Rotating part, 4: Rotation angle detector, 6, 13: Motor, 7: X slide member, 8: Feed screw, 9:
First detector, 10: Z slide member, 11: Z
Directional guide, 12: Feed screw, 14: First fulcrum, 1
5: first lever, 16: detector, 17: second fulcrum, 18: second lever, 19: detector, 20: scale, 21: reading head, 22, 24: spring,
23: Contact, 26: Screw shaft (object to be measured).

Claims (1)

[Scope of Claims] 1. A screw measuring device that measures the cylindricity, pitch, lead, etc. of a screw by rotating the screw shaft to be measured on an inclination adjustment table installed on a base, comprising: an X slide member that is movable in the X direction by a feed screw and has a Z direction guide; a Z slide member that can be driven by the feed screw along the Z direction guide and has a first fulcrum; a first displacement detector that is pivotally supported and has a first displacement detector between the Z slide member and a second fulcrum;
a lever; a second lever that is pivotally supported on a second fulcrum, has a contact, and has a second displacement detector between it and the first lever; a scale in the Z direction provided on the X slide member; The scale reading head installed on the first lever and the Z
A screw measuring device having a motor that controls driving of a sliding member.