JP2503879Y2 - Inner diameter measuring instrument with protection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application This invention is an inner diameter measuring device that measures the inner diameter of a workpiece by opening and closing the touch lever, and uses a touch lever and a detector when setting workpieces of different dimensions. The present invention relates to an inner diameter measuring instrument with a protection mechanism that prevents damage.

(B) Conventional Technique Next, a configuration diagram of an inner diameter measuring device according to the conventional technique will be described with reference to FIG. In FIG. 4, 1 is a detector, 2 and 3 are touch levers, 2A is a fulcrum of the touch lever 2, and 3A is a touch lever 3.
Fulcrum, 6 is a spring that spreads the touch levers 2 and 3, 9A
And 9B are actuators, 9E and 9F are arms, 10 is a guide,
Reference numeral 11 is a work whose inner diameter is measured.

In Fig. 4, when actuator 9A is driven, rod 9C
Goes in and out of actuator 9A. The arm 9E is attached to the outside of the touch lever 2, and the arm 9F is also attached to the outside of the touch lever 3. When the actuator 9A is driven so that the rod 9C comes out of the actuator 9A, the touch lever 2 rotates inward.

The relationship between actuator 9B, rod 9D, and arm 9F is the same as the relationship between actuator 9A, rod 9C, and arm 9E. Actuator 9A moves in the direction in which rods 9C and 9D come out at the same time.
・ When 9B is driven, the distance Q between the tips of the touch levers 2 and 3
Becomes shorter. Guide 10 is touch lever 2/3 and work 11
It is attached to the detector 1 in order to align the center of the measurement part of and to prevent measurement error.

The touch levers 2 and 3 contact the work 11 from the state shown in FIG. 4 and transmit the inner diameter of the work 11 to the detector 1. Detector 1
There is a differential transformer inside the touch lever 2
・ Measure the inner diameter of the workpiece 11 from the position 3. Note that the relationship between the touch levers 2 and 3 and the detector 1 is, for example, as follows.
It is also described in Japanese Patent No. 46410.

When the distance Q between the touch levers 2 and 3 is larger than the guide diameter P of the guide 10 when the work 11 is inserted into the guide 10, the touch levers 2 and 3 come into contact with the work 11 to detect the touch levers 2 and 3 and the detection. The vessel 1 may be damaged.

To prevent damage to the touch levers 2 and 3 and the detector 1, when inserting the workpiece 11, push out the rods 9C and 9D with the actuators 9A and 9B and push the arms 9E and 9F to touch the lever 2
・ The interval Q of 3 should be smaller than the guide diameter P of the guide 10.

Next, the perspective view of FIG. 4 will be described with reference to FIG. Fifth
The drawing is a state diagram in which the guide 10 of FIG. 4 is taken out from between the touch levers 2 and 3. The guide 10 has a cylindrical shape, and has a T-shaped cross section so as not to interfere with the touch levers 2 and 3 when the guide 10 is attached to the detector 1.

Next, a state in which the work 11 is being measured will be described with reference to FIG. FIG. 6 shows the actuator from the state of FIG.
9A and 9B are driven to retract rods 9C and 9D, the distance between touch levers 2 and 3 is widened by the force of spring 6, and touch levers 2 and 3 are brought into contact with work 11 to detect the inner diameter of work 11. It is a state diagram which is measured in 1.

When measuring a workpiece with different dimensions from the workpiece 11 with the inner diameter measuring device in Fig. 4, a measurement error will occur if the centers of the touch levers 2 and 3 deviate from each other. Therefore, the guide 10 should be changed according to the inner diameter of the workpiece. Replace with a guide.

(C) Problems to be solved by the invention When measuring workpieces of different dimensions with the inner diameter measuring device of FIG. 4, the actuator 9A is used to replace the guide and not to damage the touch levers 2 and 3 when inserting the workpiece.
・ A control mechanism to drive 9B is required. However, there is a possibility that the touch levers 2 and 3 are left open due to a malfunction of the control mechanism or an operation error by the user. When the work is inserted into the guide in this state, the touch lever 2
・ There is a problem that 3 or the detector is damaged.

This device is based on the actuators 9A and 9B and the rod shown in FIG.
Instead of 9C / 9D and arms 9E / 9F, touch levers 2.3
By installing different arms inside the, the size from the mounting surface of the guide and the detector to the end face of the guide is changed according to the inner diameter of the work, and the end face of the guide hits the newly provided arm, the touch lever 2・ Change the interval Q of 3,
An object of the present invention is to provide an inner diameter measuring instrument with a protection mechanism that does not require a control mechanism for exchanging workpieces of different sizes.

(D) Means for Solving the Problems In order to achieve this object, the present invention comprises a touch lever 2 rotating on a fulcrum 2A and a touch lever 3 arranged on the opposite side of the touch lever 2 and rotating on a fulcrum 3A. , An arm 4 fixed inside the touch lever 2, an arm 5 fixed inside the touch lever 3, and a detector forming a mounting surface 1A for mounting a guide to be replaced corresponding to the inner diameter of the workpiece to be measured. 1, the guide is formed in a T-shape in cross section, and an end face protruding toward the mounting surface 1A side in the axial direction is formed by an arbitrary dimension such that the protruding dimension Y of the touch levers 2 and 3 from the guide is appropriate. Then, the end face comes into contact with the arm 4 and the arm 5 by being attached to the attachment surface 1A, and the protrusion dimension Y of the touch levers 2 and 3 from the guide is appropriately set.

(E) Operation Next, the configuration diagram of the inner diameter measuring instrument with the protection mechanism according to the present invention will be described with reference to FIG. 1A in FIG. 1 is a detector mounting surface, 4 and 5 are arms, 7 is an end surface of the guide 7, 7B is a depth dimension of the guide 7, that is, an end surface 7A protruding from the mounting surface 1A by a dimension V. The dimensions are the same as in FIG. The arm 4 is fixed inside the touch lever 2, and the arm 5 is fixed inside the touch lever 3.

That is, FIG. 1 shows the actuators 9A and 9B shown in FIG.
Arms 4 and 5 are provided instead of the rods 9C and 9D and the arms 9E and 9F, and the guide 7 exchanged for each work defines the dimension V from the mounting surface 1A to the end surface 7A, and the arms 4 and 5 are attached to the end surface 7A. It is something that comes into contact.

The guide 7 has a T-shaped cross section, and has an end face 7A axially protruding from the mounting surface 1A by a dimension V corresponding to the inner diameter X of the work 11. In FIG. 1, the guide 7 is attached to the detector 1.
When it is mounted on the mounting surface 1A, the end surface 7A contacts the arm 4 and the arm 5.

Next, a partially enlarged view of the guide 7 and the touch lever 2 before inserting the work 11 in FIG. 1 will be described with reference to FIG. The dimension Y in FIG. 2 is the protrusion amount of the touch lever 2 from the guide 7. If the dimension Y is too large, the work 11 hits the touch lever 2 when inserting the work 11,
Not only will the work 11 not be inserted, but the touch levers 2 and 3 and the detector 1 will be damaged. Also, the dimension Y
If is too small, the inner diameter of the work 11 cannot be measured.

Therefore, the dimension Y is set so that the touch levers 2 and 3 and the detector 1 are not damaged when the work 11 is inserted into the guide 7 and that the work 11 contacts the work 11.

Next, a state diagram when the workpieces 12 having different inner diameters are measured by the inner diameter measuring device of FIG. 1 will be described with reference to FIG. In FIG. 3, 8 is a guide and 12 is a work. The guide 8 in FIG.
The outer diameter Z and the depth dimension 8B, that is, the dimension from the mounting surface 1A to the end surface 8A protruding axially by the dimension W from the mounting surface 1A are different from those of the guide 7 in FIG. 1, and the dimension W corresponds to the outer diameter Z of the guide 8. Is formed.

Touch lever 2 that fits the guide 8 according to the dimension W
The protrusion size Y of 3 can be obtained, the work 12 and the touch levers 2 and 3 contact each other, and the inner diameter of the work 12 is measured.

(G) Effect of the Invention According to this invention, arms are provided inside the touch lever, and the guide is changed in the axial dimension from the mounting surface of the detector to the end surface of the guide according to the inner diameter of the work. However, the end surface of the guide hits the arm by mounting on the mounting surface of the detector so that the interval between the touch levers is changed. Even if the guide is exchanged, the control mechanism for exchanging workpieces with different internal dimensions becomes unnecessary, and damage to the touch lever and detector due to malfunction of control equipment or operation mistake can be eliminated. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of an inner diameter measuring instrument with a protection mechanism according to the present invention, FIG. 2 is a partially enlarged view of the touch lever 2 and guide 7 of FIG. 1, and FIG. 3 is the inner diameter measuring instrument of FIG. 4 is a sectional view of the inner diameter measuring device according to the prior art, FIG. 5 is a perspective view of FIG. 4, and FIG. 6 is a diagram showing the inner diameter measuring device of FIG. FIG. 1 ... Detector, 1A ... Mounting surface, 2 ... Touch lever, 2A
…… Support point, 3 …… Touch lever, 3A …… Support point, 4 …… Arm, 5 …… Arm, 6 …… Spring, 7 …… Guide, 7A…
… End face, 8 …… guide, 8A …… end face, 9A ・ 9B …… actuator, 9C ・ 9D …… rod, 9E ・ 9F …… arm, 10 ・ ・ ・
… Guide, 11/12 …… Work.

Claims (1)

(57) [Scope of utility model registration request] 1. A first touch lever (2) which rotates at a first fulcrum (2A) and an opposite side of the first touch lever (2) which rotates at a second fulcrum (3A). A second touch lever (3), a first arm (4) fixed to the inside of the first touch lever (2), and a second arm fixed to the inside of the second touch lever (3). An arm (5) and a detector (1) forming a mounting surface (1A) for mounting a guide to be replaced corresponding to an inner diameter of a workpiece to be measured are provided, and the guide is formed in a T-shaped cross section, By forming an end face projecting to the axial mounting surface (1A) side by an arbitrary dimension that makes the protruding dimension Y of the touch lever (2, 3) from the Comes into contact with the first arm (4) and the second arm (5), and touches from the guide. Lever protection mechanism with an inner diameter measuring instrument, characterized in that (2, 3) is properly set constituting the jumping out dimension Y of.