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Constant pressure mechanism and constant torsion mechanism

A cam mechanism and pressure technology, applied in mechanical equipment, mechanical measuring devices, mechanical devices, etc., can solve the problems of inconvenient operation of constant pressure mechanism, complicated mechanism structure, and change of contact pressure, etc.

Inactive Publication Date: 2003-11-05
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So, the problem is that every time the contact moves, the contact pressure changes
Therefore, the size of the structure for supporting the contacts is quite large, and the operation of the constant pressure mechanism is inconvenient, or the constant pressure mechanism prevents measurement in a narrow space
[0006] In addition, although a mechanism for obtaining constant torque has been proposed in JP-Y-5-21324, this constant torque mechanism can only be used for screw drive
Therefore, the structure of the mechanism is too complicated to be applied to a simple measuring device such as a caliper

Method used

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  • Constant pressure mechanism and constant torsion mechanism
  • Constant pressure mechanism and constant torsion mechanism
  • Constant pressure mechanism and constant torsion mechanism

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0077] figure 1 with 2 Shows the first embodiment of the constant pressure mechanism of the present invention, in which the pressure transmitting member 3A compressed by the coil spring 1A is placed inside a housing 2A containing the coil spring 1A, so that the pressure transmitting member 3A is in one direction Sliding.

[0078] In addition, a follower 4A slidable in a direction perpendicular to the direction of movement of the pressure transmitting member 3A is placed inside the housing 2A. The contact piece 5A whose end can contact the surface S to be measured is fixed to one end of the driven piece 4A, and figure 1 The tooth condition 6A shown by the two-dot chain line is fixed to the other end of the follower 4A. The amount of movement of the contact 5A is measured by the tooth condition 6A.

[0079] In order to make the follower 4A follow the linear sliding of the pressure transmitting member 3A, a displacement conversion cam mechanism is provided between the pressure tra...

no. 2 example

[0087] Figure 4 Shows the constant pressure mechanism according to the second embodiment of the present invention. in Figure 4 In, combined with figure 1 with 2 Similar components in the first described embodiment are represented by adding "B" after the corresponding numbers.

[0088] The feature of the second embodiment is that the aforementioned cam surface 8A is deformed into a quadratic cam groove 8B. Therefore, the elastic force of the coil spring 1B is transmitted to a follower 4B through a displacement conversion cam mechanism composed of a push rod 7B and a conic cam groove 8B.

[0089] Therefore, with the constant pressure mechanism of the second embodiment, of course, similar effects to the first embodiment can be obtained.

[0090] The above-mentioned first and second embodiments are both in terms of a constant pressure mechanism in which the push rods 7A and 7B are respectively provided in the pressure transmitting members 3A and 3B, and the cam surface 8A and the ...

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Abstract

A constant pressure mechanism, comprising: a pressure transmitting member movable linearly in a predetermined direction and pushed by a pushing member; a rotating member rotatable around a central axis in a casing, the casing accommodating the pressure transmission member; a follower supported to the housing to move linearly; and a displacement conversion mechanism interposed between the pressure transmission member, the rotating member and the follower, the displacement The switching mechanism has a first link arm pinned between one end of the rotating member and the pressure transmitting member, and a second link arm pinned between the other end of the rotating member and the driven member. lever arm.

Description

Technical field [0001] The present invention relates to a constant pressure mechanism and a constant torque mechanism, for example, used in contact measuring devices or similar equipment. technical background [0002] As is well known, in measuring devices such as spiral micrometers or similar devices, a contact piece (measurement piece) is pressed against the surface to be measured by the force of a spiral spring, so that measurement can be performed. However, in the structure in which the contact is pressed only by the coil spring, the urging force of the coil spring changes according to its deflection state. Therefore, the problem is that every time the contact moves, the contact pressure changes. [0003] That is, when the thrust of the coil spring changes with a certain amount of movement of the contact piece, the contact pressure of the contact piece acting on the surface to be measured will change in all such cases. Therefore, due to the reaction force corresponding to the...

Claims

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Application Information

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IPC IPC(8): B25B23/14F16F1/12G01B5/00G01B5/012G01B21/00
CPCG01B5/012Y10T74/18984
Inventor 仁科信吾
Owner MITUTOYO CORP