JPH0555014U - Cross spring mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The function of the cross spring is maintained even when a pressing force exceeding the elastic stress of the leaf spring acts in the longitudinal direction of the leaf spring that constitutes the cross spring. [Constitution] The shaft 42 is connected to the intersection 30A of the cross spring 30.
The guide hole 46A is formed on the extension line of the above, and is further fitted into the guide member 46 on the shaft 42 and has a constant gap formed in the radial direction of the shaft 42. Then, either one of the shaft 42 and the guide member is provided on the tracing stylus 36, and the other is provided on the measuring device main body. Therefore, when a pressing force that exceeds the elastic stress of the leaf springs 32, 34 acts in the longitudinal direction of the leaf springs 32, 34 that form the cross spring 30, the shaft may move inside the guide hole before the leaf spring is plastically deformed. Since they come into contact with each other, plastic deformation of the leaf spring can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cross spring mechanism, and more particularly to a cross spring mechanism that allows vertical movement of a stylus of a contour measuring machine or the like.

[0002]

[Prior Art]

 The contour shape measuring device measures the contour shape of the object to be measured by moving the needle along the surface of the object to be measured while the object is in contact with the needle. As shown in FIG. 3, the stylus 10 of the contour measuring machine is attached to the tip of the arm 12, and the rear end of the arm 12 is connected to the right end of the oscillator 14. The oscillator 14 is supported by the measuring device main body 18 via a cross spring 16 and swings about an intersection 16A of the cross spring 16. A differential transformer 20 is provided at the left end of the oscillator 14, and the differential transformer 20 detects displacement of the stylus 10.

[0003]

[Problems to be solved by the device]

 However, when the stylus 10 is brought into contact with the object to be measured, if the pressing force exceeding the elastic stress of the leaf springs 16A, 16B acts in the longitudinal direction of the leaf springs 16A, 16B forming the cross spring 16, the leaf springs are acted. There is a problem that the functions of the cross spring 16 are lost due to deformation of 16A and 16B.

The present invention has been made in view of the above circumstances, and functions of the cross spring when the pressing force exceeding the elastic stress of the leaf spring acts in the longitudinal direction of the leaf spring forming the cross spring. It is an object of the present invention to provide a cross spring mechanism capable of maintaining

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a measuring device in which a rocker provided with a stylus is swingably provided on a measuring device main body through a pair of plate springs intersecting in a substantially cross shape. And a guide member having a guide hole in which the shaft is fitted and a guide hole having a constant gap formed on the outer circumference in the radial direction of the shaft is provided. One of the shaft and the guide member is provided on the oscillator and the other is provided on the measuring device body.

[0006]

[Action]

 According to the present invention, the shaft is arranged on the extension line of the intersection of the cross spring, and the guide hole is formed in the guide member and formed with a constant gap in the radial direction of the shaft. Then, either one of the shaft and the guide member is provided on the oscillator and the other is provided on the measuring device main body.

Therefore, when a pressing force exceeding the buckling stress of the leaf spring acts in the longitudinal direction of the leaf spring forming the cross spring, the shaft and the inner circumference of the guide hole come into contact before the leaf spring is plastically deformed. The plastic deformation of the leaf spring can be prevented.

[0008]

【Example】

 The cross spring mechanism according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing a state where the cross spring mechanism according to the present invention is used in a contour measuring machine, and FIG. 2 is a side view thereof. The cross spring mechanism 30 has leaf springs 32 and 34, and the leaf springs 32 and 34 are arranged orthogonally in a substantially cross shape. The lower end portions 32A and 34A of the leaf springs 32 and 34 are fixed to the upper end portion of the oscillator 36 via a screw 38. The upper ends 32B and 34B of the leaf springs 32 and 34 are fixed to the lower end of the measuring device body 40 with screws 38. As a result, the oscillator 36 is swingably supported by the measuring device main body 40 around the intersection 30A of the leaf springs 32 and 34.

Further, the measuring device body 40 is provided with a protruding plate 42. A shaft 44 is planted in the projecting plate 42, and the axis of the shaft 44 is coaxially arranged at the intersection 30A of the plate springs 32 and 34. Further, a protrusion 46 is formed on the oscillator 36, and the protrusion 46 is provided so as to face the protrusion plate 42. A guide hole 46A is formed in the projecting portion 46, and the shaft 44 is coaxially fitted in the guide hole 46A. A predetermined gap is formed between the inner circumference of the guide hole 46A and the outer circumference of the shaft 44.

In FIG. 1, an arm 50 is attached to the right end of the oscillator 36 via a bolt 48, and a stylus 52 is provided at the tip of the arm 50. A differential transformer 54 is provided at the left end of the oscillator 36, and the differential transformer 54 detects the amount of deflection of the stylus 52. The operation of the cross spring mechanism according to the present invention constructed as above will be described. First, the stylus 52 is brought into contact with the measurement surface of the object to be measured (not shown) at the tip of the arm 50. In this case, if the stylus 52 is overloaded due to an erroneous operation, and if a pressing force F that exceeds the buckling stress of the leaf springs 32, 34 acts in the longitudinal direction of the leaf springs 32, 34 due to the overload that occurs, The leaf spring 32 or the leaf spring 34 is bent into a curved shape.

When the leaf spring 32 or the leaf spring 34 is bent into a curved shape, the protruding portion 46 of the oscillator 36 moves, and the inner circumference of the guide hole 46 A of the protruding portion 46 contacts the outer circumference of the shaft 44. . Thereby, the bending of the leaf spring 32 or the leaf spring 34 is limited within the elastic bending range, so that the leaf spring 32 or the leaf spring 34 is prevented from being plastically deformed. Therefore, the function of the cross spring 30 is maintained.

It is also possible to form the shaft 44 and the guide hole 46A of the protruding portion 46 of a conductive member and use each of them as an electrode. That is, when the shaft 44 and the guide hole 46A come into contact with each other, an alarm means (not shown) is activated to generate an alarm sound or the like, and the overload state can be electrically detected.

[0013]

[Effect of the device]

 As described above, according to the cross spring mechanism of the present invention, when a pressing force exceeding the elastic stress of the leaf spring acts in the longitudinal direction of the leaf spring that constitutes the cross spring, the leaf spring is not plastically deformed. Since the shaft and the inner circumference of the guide hole are in contact with each other, the plastic deformation of the leaf spring can be prevented.

Therefore, the function of the cross spring can be maintained even if a pressing force that exceeds the elastic stress of the plate spring acts in the longitudinal direction of the plate spring that constitutes the cross spring.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a cross spring mechanism according to the present invention is used in a contour measuring machine.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a state in which a conventional cross spring mechanism is used in a contour measuring machine.

[Explanation of symbols]

 30 ... Cross spring mechanism 30A ... Intersection 32, 34 ... Leaf spring 36 ... Oscillator 40 ... Measuring device main body 44 ... Shaft 46 ... Guide member 46A ... Guide hole

Claims (2)

[Scope of utility model registration request] 1. A measuring device in which a swinger provided with a stylus is swingably provided on a measuring device main body through a pair of leaf springs that intersect in a substantially cross shape, and is orthogonal to the intersecting direction at the intersection of the leaf springs. A shaft arranged on an extension line in the direction of a guide, and a guide member having a guide hole in which the shaft is fitted and a constant gap is formed on the outer circumference in the radial direction of the shaft. A cross spring mechanism, characterized in that one is provided on the oscillator and the other is provided on the measuring device body. 2. The cross spring according to claim 1, wherein the shaft and the guide member are formed of a conductive member, and the contact between the shaft and the guide hole is electrically detected to detect an overload state. mechanism.