JPH0674744A - Signal gauge - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a compact, highly accurate and inexpensive signal gauge. [Structure] Switch means 38, 39, 40, 41 which are integrally displaced with a measuring shaft 34 are provided inside a housing 31, and opening / closing means 43, 44 for the switch are provided in the housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal gauge for automatically measuring the shape and dimensions of parts.

[0002]

2. Description of the Related Art In a conventional signal gauge, a switch mechanism is fixedly provided on an inner wall of a housing to obtain a signal. For this reason, the position and dimensions of the detection object are configured to be linked to the measurement axis that moves in contact with the detection object and to be measured by operating through several gears or several levers. There is.

Further, the setting position of the signal point is set by moving the mounting position of the switch mechanism.

An example of the conventional switch mechanism of the signal gauge as described above will be described with reference to FIG. FIG. 4 (a),
(B) and (C) are operation | movement block diagrams which respectively show the outline of the principal part operation | movement of the switch mechanism of the signal gauge currently implemented. Reference numeral 1 shown in FIG. 4 is a measuring shaft that is vertically movable so as to come into contact with an object to be measured and perform measurement. Above the measuring shaft 1, there are provided support rods 2 and 3 which are formed at a predetermined interval so as to project in the same direction. Supports 4 and 5 are provided on the housings (not shown) at the lateral positions corresponding to the support rods 2 and 3, respectively, and bell crank-shaped levers each having a turning tendency in the clockwise direction are provided. One end is in contact with the supporting rods 3 and 4, and the other end is in contact with movable contacts 8 and 9.

By the operation of the supporting rods 2 and 3, when one end of each lever is rotated by abutting, the movable contacts 8 and 9 located at the other end of the lever are rotated. Fixed contacts 6 and 7, respectively, are provided in (not shown).

The operation of the switch mechanism having the above structure will be described with reference to FIGS. 4 (a), 4 (b) and 4 (c). In the state of FIG. 4A, the measuring shaft 1 is in a descending state. The movable contacts 8 and 9 located at the other ends of the levers 2 and 3 of the measuring shaft 1 are separated from the fixed contacts 6 and 7 by the contact of one end of each lever. ing. That is, the circuits are all open circuits.

In the state shown in FIG. 4B, the measuring shaft 1 is raised. That is, the movable contacts 9 located at the other ends of the levers 2 and 3 of the measuring shaft 1 are brought into contact with the fixed contacts 7 when one end of each lever is brought into contact with the fixed contacts 7. The movable contact 8 is slightly separated from the fixed contact 6, but is still separated from the fixed contact 6. Therefore, the movable contact 9 and the fixed contact 7 form a closed circuit, and the movable contact 8 and the fixed contact 6 form an open circuit.

In the state shown in FIG. 4 (c), the measuring shaft 1 is in a state further raised from the state shown in FIG. 4 (b). That is, on the lower end surfaces of the supporting rods 2 and 3 of the measuring shaft 1, one end portion of each lever is further raised from FIG.
Also contacts the fixed contact 6 to form a closed circuit, and the movable contact 9
A closed circuit is formed with the fixed contact 7.

[0009]

In the conventional signal gauge having the above structure and method, the switch mechanism is fixed to the fixing member (main body) such as the side wall in the housing, so that the housing becomes larger than necessary. There was a problem. In addition, the structure for accurately moving the mounting position of the switch device becomes complicated, which causes a problem in terms of cost.

The present invention was made in view of the above problems, and a small switch is integrally mounted and displaced on a measuring shaft slidably provided on a housing to reduce the size of the entire apparatus, and It is an object of the present invention to provide a signal gauge that can be manufactured at a low cost with improved accuracy.

[0011]

According to the present invention, there is provided a measuring shaft projecting outward from a side surface of a housing and configured to be slidable, and a switch means provided integrally with the measuring shaft in the housing.
A signal gauge comprising: a biasing unit configured to constantly bias the measurement axis in the measurement direction of the object to be measured.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a vertical cross section of a signal gauge according to the present invention, and FIGS. 2 and 3 are plan views showing a vertical cross section of an operating state of the signal gauge shown in FIG.

The rectangular parallelepiped shown in FIG. 1 is a casing 31,
At the center of the outer peripheral bottom wall of the housing 31, a cylindrical shank 32 is provided so as to project downward. The tip of the measuring shaft 34 is slidably fitted and mounted on the inner diameter of the shank 32. The base end of the measuring shaft 34 is inside the housing 31, and a rectangular movable body 33 is inserted and fixed by the hole formed therein. A contact 35 that comes into contact with the object to be measured is provided at the tip of the measuring shaft 34.

An elastic member 36 is provided between the inner surface of the upper wall of the housing 31 and the base end of the measuring shaft 34 so as to constantly urge the measuring shaft 34 in the tip (measurement) direction. ing.

Further, one side (the right side piece in FIG. 1) of one side of the movable body 33, which is integrally formed with the measuring shaft 34 and is formed of an insulating material in the shape of a box, around the measuring shaft 34 is a cylindrical shape. A hole 37 for inserting and configuring the switch device is formed. One ends of ring-shaped fixed contacts 38 and 39 are inserted into the openings of both ends of the hole 37. Spherical movable contacts 40 and 41 are disposed between the upper and lower fixed contacts 38 and 39, and an elastic member (conductive coil) that urges outward between the movable contacts 40 and 41, that is, outward. The movable contact 40 and 41 are pressed (biased) toward the respective end portions, and the fixed contact 38 and 39 are electrically connected. There is.

The movable contact 4 is formed on the inner wall of the housing 31 at a position corresponding to the hole 37 in which the movable contact 41 is arranged.
A push pin 43 that pushes up 1 to open and close the fixed contact 39 and the movable contact 41 is implanted through an insulating ring.

Similarly to the movable contact 41, the movable contact 40 at the upper position has the above-mentioned inner wall of the upper end surface of the housing 31 at a position corresponding to the hole 37 in which the movable contact 40 in the movable body 33 is disposed. A push pin 44 is provided so as to open and close between the movable contact 40 and the fixed contact 38 as the measurement shaft 34 is pushed, and the push pin 44 corresponds to the operation (movement) amount of the measurement shaft 34 and generates a signal. Is adjustable and is insulated from the housing. A circular setting knob 55 that facilitates adjustment is integrally provided at the base end protruding to the outside of the push pin 44.

At one end of the fixed contacts 38 and 39,
Lead wires 45 and 46 are connected to form a bundle 47, respectively.
And taken out to form a predetermined circuit.

A shank 32 protruding from the housing 31.
A slotted hole 50 is provided on the outer circumference in the generatrix direction, and a screw portion is provided on the outer circumference at the end so that the nut 53 can be screwed.

In order to hold the signal gauge 30,
In a device (not shown), a shank 32 is inserted through an elastic member 52 into a hole 49 provided in a mounting bracket 48 having a base end attached, and the nut 53 is screwed. On the other hand, the rotation stop screw 5 screwed to the bracket 48
Since No. 1 is fitted in the slot 50 of the shank 32, the position of the shank 32 can be adjusted in the rectilinear direction by turning the nut 53.

As shown in the drawing, a groove for preventing rotation of the movable body 33 is formed in the other side edge (left side piece in FIG. 1) of the movable body 33, and a pin 54 is slidably fitted in the groove. Are planted on the inner bottom wall surface of the housing 31.

Next, the operation of the signal gauge 30 having the above structure will be described. The state shown in FIG. 1 shows a state in which the measuring contact 35 arranged at the tip of the measuring shaft 34 is not abutted on the object to be measured. Measuring shaft 3 by elastic member 36
4 and the movable body 33 connected to it are also lowered until they come into contact with the inner bottom portion of the housing 31, and the tip of the push pin 43 is inserted from the central hole of the fixed contact 39 and pushes up the movable contact 41 so that the fixed contact 39 and Is disconnected. On the other hand, the fixed contact 38 and the movable contact 40 arranged above are in contact with each other, but the fixed contact 39 and the movable contact 40 are separated from each other.
An open circuit is formed between the lead wires 45 and 46.

Next, when the measuring shaft 34 is pushed in a predetermined amount by the object to be measured with which the measuring contact 35 is in contact,
As shown in FIG. 2, the movable contact 41 is
It moves in the direction of contacting the fixed contact 39 and connects with the fixed contact 39. That is, the movable contact 41 and the fixed contact 39 are electrically connected. On the other hand, since the fixed contact 38 and the movable contact 40 arranged above are still in contact with each other, a closed circuit is formed between the lead wires 45 and 46 via the conductive elastic member 42. This position is the generation point of the first signal. To set the generation point of the first signal, the nut 53 is rotated to linearly and finely move the signal gauge 30 with respect to the bracket 48, and the pushing amount of the measurement shaft 34 due to the measurement contact 35 hitting the measured object is adjusted. You can make fine adjustments by doing.

When the measuring shaft 34 is further pushed in, the push pin 44 pushes the movable contact 40 against the bias of the elastic member 42 to break the contact with the fixed contact 38, as shown in FIG. Again, a closed circuit is formed between the lead wires 45 and 46. This position is the generation point of the second signal. This position can be set by rotating the setting knob 55 and finely adjusting the position of the push pin 44.

As the measuring shaft 34 is pushed in as described above, the circuit is constructed as open → closed → open.

[0026]

According to the present invention having the above-mentioned structure, since the switch mechanism is fixedly mounted on the movable measuring shaft, it can be assembled in a compact and reliable manner, which is remarkable in terms of cost and quality. Produce an effect.

[Brief description of drawings]

FIG. 1 is a plan view showing a signal gauge according to an embodiment of the present invention.

FIG. 2 is a plan view showing a longitudinal sectional view of an operating state of the present invention shown in FIG.

FIG. 3 is a plan view showing the operating state of the present invention shown in FIGS. 1 and 2 in a longitudinal sectional view.

FIG. 4 is an operational configuration diagram showing a main part of a switch mechanism implemented in a conventional signal gauge.

[Explanation of symbols]

 30 signal gauge 31 housing 32 shank 33 movable body 34 measuring axis 35 measuring contact 38, 39 fixed contact 40, 41 moving contact 36, 42, 52 elastic member 43, 44 push pin 45, 46, 47 lead wire 48 mounting bracket 53 nut 55 knob

Claims (1)

[Claims] 1. A measuring shaft projecting outward from a side surface of a housing and configured to be slidable, a switch means integrally provided with the measuring shaft in the housing, and the measuring shaft constantly measuring an object to be measured. Signal gauge, comprising: a biasing means configured to bias in a direction; and an opening / closing means for the switch, which is provided in the housing in the axial direction of the measurement axis.