JP3051970U - Tool holding device - Google Patents

Abstract

(57) [Summary] In a mechanism for grasping a tool 32 by using a claw 20b created on a diaphragm 20a, a rotational torque is applied to a differential screw 22 to generate a large thrust on a push rod 21 to cause the diaphragm 20a to move. By deforming, the claw 20b is opened, the tool 32 is inserted, and then the differential screw 22 is rotated in the reverse direction to eliminate the thrust of the push rod 21, thereby making the tool 32 stronger and more accurate by the elastic restoring force of the diaphragm 20a. A tool gripping device that enables gripping. Further, the balance weight 20c is formed on the diaphragm 20a to maintain strong and high precision even during high-speed rotation. [Effect] The tool can be gripped with high precision and high grasping force, and can be maintained even during high-speed rotation.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a tool holding device.

[0002]

[Prior art]

 Conventionally, to grip a tool, a hole 31 slightly larger than the tool diameter is drilled at the tip of the taper holder 20 as shown in FIG. 5, a tool 32 is inserted, and a push screw 34 is inserted into a female screw 33 drilled at a right angle to the hole 31. Is fixed by pressing the screwing tool 32 from the side.

[0003]

[Problems to be solved by the invention]
The tool 32 is mounted eccentrically by a gap 35 from the center of the hole 31 formed in the center of the tapered holder 20. The eccentricity of the clearance 35 is not constant due to a diameter error of the tool 32 and a diameter error of the hole 31. Therefore, no correction is possible. It is an issue of the present invention to solve this.

[0004]

[Means to solve the problem]

 As shown in FIGS. 1, 2, 3, and 4, a diaphragm 20a is formed integrally with the tip of the tapered holder 20, and a claw 20b for holding a tool 32 is formed on the right surface of the diaphragm 20a. A balance weight 20c is created on the left side. The push rod 21 is arranged so as to press the center of the diaphragm 20a. A female screw portion 21 a is formed inside the push rod 21, and the small-end male screw portion 22 a of the differential screw 22 is screwed in. The push rod 21 is guided by a plurality of push screws 20e so as not to rotate. The large-end male screw portion 22 b of the differential screw 22 is screwed into the rear female screw portion 20 d of the tapered holder 20.

[0005] A hexagonal hole 22c is provided inside the large-end male screw portion 22b of the differential screw 22. The pull stud 24 has a hole 24a at the center, and is screwed and fixed to a rear internal thread portion 20d of the taper holder 20. The diameter of the claw 20b is finished to the same size as the diameter of the tool 32 in a state where the diaphragm 20a is bent to the right by the push rod 21.

[0006]

[Action]

 (1) When the hexagon wrench 23 is inserted into the hexagonal hole 22c of the differential screw 22 and rotational torque is applied, the differential screw 22 rotates to move the large-end male screw portion 22b to the right by the pitch and the small-end male screw portion 22a. Move the push rod 21 to the left by the pitch.

(2) As a result, the push rod 21 is moved rightward by the pitch difference between the large-end and small-end male threads, and a large thrust is generated with a small rotation torque.

[0008] (3) The push rod 21 pushes the center of the diaphragm 20a by thrust to deform the diaphragm 20a. {Lower half state in FIG. 4} When the diaphragm 20a deforms to the right, the claw 20b opens and the tool 32 is inserted. I do.

(4) When the hexagon wrench 23 is rotated in the reverse direction and the push rod 21 is completely returned to the left so that no thrust is applied to the diaphragm 20a, the diaphragm 20a returns to its original state due to the elastic restoring force. Accordingly, the claws 20b close and the elasticity of the tool 32 is accurately grasped.

(5) Even if the taper holder 20 rotates and the grasping force is reduced due to the centrifugal force of the claw 20b, the balance weight 20c compensates for this and the grasping force does not decrease.

[0011]

【Example】

 The embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a diaphragm 20a integrated with a tape holder 20 is formed by a wire cutting machine. At this time, a nail 20b is created at the right end, and a balance weight 20c is created at the left end.

The claw 20b is divided into two, and the balance weight 20c is also divided into two. The center of the diaphragm 20 a is arranged to be pushed by the push rod 21, a female thread 21 a is provided at the left end of the push rod 21, and the small-end male thread 22 a of the differential screw 22 is screwed. The large-end male screw portion 22b of the differential screw 22 is screwed into a rear female screw portion 20d provided inside the tape holder 20.

A hexagonal hole 20 c is provided in the differential screw 22 and a through hole 24 a is provided in the pull stud 24 so that a torque can be applied by a hexagonal wrench 23. A cover 25 is screwed into the left part to protect the diaphragm 20a.

A torque is applied to the differential screw 22 using a hexagon wrench 23 to generate a thrust on the push rod 21 to deform the diaphragm 20a to the right. In this state, the inner diameter of the claw 20b is finished to the diameter of the tool 32.

When the differential screw 22 is tightened with a stronger torque after finishing the claw 20b, the claw 20b is further opened, and the tool 32 can be inserted into the claw 20b. After inserting the tool 32 into the claw 20b, the hexagon wrench 23 is rotated in the reverse direction to remove the deformation of the diaphragm 20a. As for the tool 32, the elastic restoring force of the diaphragm 20a is transmitted to the claw 20b, and the tool 32 grasps the tool 32 precisely and strongly.

[0016]

[Effect of the invention]

 According to the present invention, the concentricity between the tape holder 20 and the tool 32 can be realized with remarkably high accuracy, and a tool gripping device having high gripping rigidity and gripping force can be provided.

[Brief description of the drawings]

FIG. 1 is a three-dimensional perspective part view showing an embodiment of the present invention.

FIG. 2 is a three-dimensional perspective assembly view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention;

FIG. 4 is an assembled sectional view showing an embodiment of the present invention.

FIG. 5 is a sectional principle view showing a conventional technique.

[Explanation of symbols]

 Reference Signs List 20 taper holder 20a diaphragm 20b claw 20c balance weight 20d rear female screw 20e push screw 21 push rod 21a female screw 22 differential screw 22a small male screw 22b large male screw 22c hexagon hole 23 hexagon wrench 24 pull stud 24a through hole 25 Cover 31 Hole 32 Tool 33 Internal thread 34 Push screw 35 Clearance

Claims (1)

[Utility Model Registration Claims] 1 A claw for gripping a tool is created on one side of a diaphragm. Create a balance weight on the other side. The push screw pushes the center of the diaphragm and the claw is opened. After the tool is inserted, the differential screw is rotated in the reverse direction to retract the push rod and generate a force for gripping the tool with the pawl. A tool holding device having the above configuration.