JPS6145901A - Automatic measuring machine for screw diameter - Google Patents

Abstract

PURPOSE:To take a measurement automatically by fixing measuring elements which contact a root part of a screw to be measured to a couple of measuring bodies which move mutually through leaf springs which flex elastically only at right angles to the moving direction. CONSTITUTION:Holders 6 at one-terminal parts of the couple of measuring bodies 5 which are fitted to a measuring part machine frame 3 with leaf spring 12 and rotatable around a virtual fulcrum 4 and holders 10 where measuring elements 9 are fixed are fixed through leaf springs 12. The size of movement when movable iron cores 16 fixed to other-terminal parts of the measuring bodies 5 move in a primary coil 18 and a secondary coil 19 through which an alternating current flows is led out of the coil 19 as a voltage to read the pitch diameter of the screw 8 to be measured. Further, the piston 22 of a cylinder 21 is moved as shown by an arrow, the measuring elements 9 are put close to the screw 8 placed on a measurement block 23, and contact parts 9a are allowed to root parts of the screw 8 through the elastic flexion of the springs 12, taking a measurement automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an automatic thread diameter measuring machine, which enables automatic measurement by elastically holding a measuring element so that it can always come into contact with the thread root.

Conventional Techniques A three-needle method is widely used to measure the pitch diameter of a screw, but it is difficult to automate the operation of bringing the needle into contact with the root diameter, making automatic measurement difficult.

Problems to be Solved by the Invention The present invention makes it possible to automatically measure the diameter of a thread by allowing a probe to easily come into contact with the root diameter of the thread.

Means for Solving the Problems In order to solve the above problems, the present invention has taken the following technical measures.

That is, the screw of the screw to be measured (8) is attached to a pair of measurement bodies (5) (5) which are held movable toward or away from each other and are configured in conjunction with a measurement unit 051 that measures the movement dimension. This is an automatic measuring machine in which measuring elements (9) that can contact the troughs (8a) are respectively fixed via leaf springs (12) that are formed to be elastically bendable only in a direction orthogonal to the above-mentioned moving direction.

Examples and effects Next, one embodiment of the present invention will be described based on the drawings.

Fig. 1 shows a front view of the main part, Fig. 2 shows a perspective view of the main part, and Fig. 3 shows a perspective view of the whole. A holder (6) is attached to one end of a pair of measuring bodies (r5) (51), which are attached to each other and are formed to be able to rotate slightly within the plane of the paper in FIG. 1 about a virtual fulcrum (4). (6) respectively bolts (force (7)...
Attach using the screw root (8a) of the screw to be measured (8)
Screw the probe (9) with a conical contact part (9a) that can be inserted and contacted into the mounting screw hole of the holder c++Il and fix it with the bolt Q1), and connect the holder [6) and Ql.
The leaf spring (1
. The measuring part α of the embodiment has a movable iron core +1 at the end of the measuring body (5) on the opposite side to the mounting side of the measuring head (9).
01 is installed with bolts 0η and AC current is flowing 1
The movement dimension when the movable iron core (10 moves) inside the secondary coil (1st stage and secondary coil (1!l) can be extracted as a voltage from the secondary coil +11 and read as the pitch diameter of the screw to be measured (8). The measurement unit frame (3) is attached to the cylinder 121 attached to the measurement unit body (2CPH).
) piston! 23 (to 2'!r, bracket (c)
Since it is installed through the piston f221 +22
When the is moved in the direction of the arrow in Figure 1, the measuring block (2
Measurement screw (8) placed in the V-shaped groove (Z3a) of 3)
As the probe f9) (91 approaches),
The contact portion (9a) (9a) is exposed at the thread root (8a), and the plate plate-h (121 (121) is elastically bent in the axial direction of the screw to be measured (8), as illustrated in Fig. 71. The probe (9) (9) will come into contact with the screw root (8a),
The measuring element (9) (9) aligns the thread root (8a) with the axis 151 f15! This can be measured as the thread diameter of the thread to be measured (8).

As an example, it is measured screw with pitch between 125 (8
). Measuring unit (1 is the one shown in the figure, and 2 can be used with other structures having similar functions).

Effects of the Invention The automatic screw diameter measuring machine according to the present invention is configured as described above, and is configured to be interlocked with a measuring section that is held movable toward or away from each other and measures this moving dimension. A measuring element (9) that can contact the thread trough (8a) of the screw to be measured (8) is elastically bent only in a direction orthogonal to the above-mentioned movement direction. Since the plate springs (+3) are each fixedly formed so that the pair of probes f9 (9) can approach the thread to be measured (8), the screw root (8a) Measuring head (9) +9
) will move a little in the axial direction of the screw to be measured (8) due to the elastic bending action of the leaf springs 112+1121, and the probes (9) (9) will correctly contact the thread root (8a). , the screw diameter can be measured almost accurately with the measuring part (151), and in this way, it is not necessary to manually align the measuring element (9) (9) with the screw root (8a), and the screw root can be measured with accuracy. The thread diameter can now be automatically measured by moving the probe f9) (91) closer to the portion (8a).

[Brief explanation of the drawing]

The figure shows an example of this invention, and Figure 1 is a front view of the main part;
FIG. 2 is a perspective view of a main part, FIG. 3 is a perspective view of the whole, and FIG. 4M is a front view of the measuring state. Description of symbols (5)... Measuring object (8)... Thread to be measured (8a)... Thread valley (9)... Measuring element (121... Leaf spring (+51... Measuring part) Patent applicant: Ongo Iron Works Co., Ltd.
″, Mino

Claims (1)

[Claims] A pair of measurement bodies that are held so as to be movable toward or away from each other and are configured in conjunction with a measurement unit that measures the movement dimension,
Automatic thread diameter measurement characterized in that measuring elements capable of contacting the thread root of the thread to be measured are fixed via leaf springs formed to be elastically bendable only in a direction perpendicular to the above-mentioned direction of movement. Machine.