JPH0544071Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a clamping and rotating device suitable for press-fitting rivets, screws, etc. while rotating, and screwing operations.

(Prior Art) As an example, a screw tightening device used for screwing together screws in industrial robots, etc.
The front part is divided into a plurality of parts and the rear end of the metal collet that can be opened and closed is closed to hold the screw member, and the screw member is held by a synthetic rubber hollow body that expands and deforms when compressed air flows in. It is known for its air chuck.

(Problem to be solved by the invention) However, in the former case, in order to improve the gripping force and screwing torque of the threaded member, increasing the amount of collet closure may actually damage or break the threaded member. Since this may cause problems, some proposals have been made in which the inner surface of the collet is coated with or affixed with soft resin or rubber to increase the frictional force with the threaded member, but these tend to peel off as they are used and have poor durability. In the latter case, although the screw member is less likely to be damaged or damaged, it is not possible to generate the gripping force and screwing torque necessary for screwing the screw member, and in addition, the screw member The problem was that it was easy to lose the center position when holding it.

(Purpose of the invention) The present invention was devised in view of the above-mentioned conventional problems, and provides a clamping and rotating device that can reliably perform screwing operations with sufficient gripping force and screwing and rotational torque. This is what I am trying to do.

(Structure of the invention) The present invention includes a casing that has a tapered portion on the inner surface of the lower part and can be raised and lowered and rotated; It consists of a collet with a slit formed in its body and a cylindrical elastic member fitted into a gripping hole of the collet. By lowering the casing, the head of a rotated member such as a screw can be attached to the elastic member. The gist of the present invention is a clamping and rotating device in which a member is inserted into the casing, the collet is closed and the member is clamped, and a member to be rotated is rotated by rotating the casing.

(Example) Hereinafter, the present invention will be explained in detail based on an example. In FIGS. 1 and 2, reference numeral 1 is a cylindrical casing fixed to a rod 2 which is raised, lowered and rotated by an external drive device (not shown), and the casing 1 is oriented downwardly toward the lower inner surface. It has a widening tapered surface 3. Reference numeral 4 denotes a collet whose front part is divided into a plurality of parts and can be opened and closed;
By rising relative to the casing 1, the tapered surface 3 of the casing 1 causes the tapered outer surface 6 of the front part to
can be pressed and closed. The collet 4 has an inner shape that matches the outer shape of the screw member to be gripped. Further, the collet 4 is designed such that a key 7 provided on the upper side surface thereof is inserted into a key groove 8 of an appropriate length bored in the casing 1 to guide the collet 4 up and down and prevent it from falling and rotating. Reference numeral 9 denotes a cylindrical member made of soft resin or rubber that is fitted into the gripping hole 10 of the collet 4. In the illustrated example, the elastic member 9 is a straight pipe of an appropriate length. Although the elastic member 9 is press-fitted into the collet 4 and deformed by its own elasticity so as to be brought into close contact with the inner surface of the collet 4, the elastic member 9 is one that has been previously formed into a shape that matches the inner shape of the collet 4. You can. 11 is a spacer provided in the collet 4 to regulate the insertion position of the elastic member 9; 12 is a center pin provided in the collet 4 to position the screw member inserted into the elastic member 9. be.

(Operation) The casing 1 is moved onto the screw member that has been set in advance before screwing, and the casing 1 is lowered to fit the elastic member 9 onto the screw member. The insertion position of the screw member into the collet 4 is the center pin 1.
2, so if the casing 1 is further lowered, the screw member will be regulated by the casing 1.
It is gripped via an elastic member 9 by the collet 4 which rises and closes relative to the collet. When the casing 1 is rotated, the collet 4 is also rotated in synchronization, so that the screw member is tightly gripped on its outer surface by an elastic member with a high coefficient of friction, and has sufficient gripping force and screwing torque to ensure secure screwing. is screwed onto.

Note that the center pin 12 in the above embodiment is not necessarily necessary, and as shown in FIG.
The elastic member 9 has a bottom, and the bottom 13 of the elastic member 9 has a bottom.
The insertion position of the screw member may be determined by using the screw member.

(Effects of the invention) As described above, the present invention includes a casing that has a tapered portion on the lower inner surface and can be raised and lowered and rotated; It consists of a collet with a slit formed in a cylindrical body and a cylindrical elastic member fitted into a gripping hole of the collet.By lowering the casing, a screw or other object can be attached to the elastic member. The head of the rotating member is inserted and the collet is closed and clamped, and the rotated member is rotated by rotating the casing, so the screws can be tightened with sufficient gripping force and screw tightening torque. The work can be done reliably, and since the elastic member is cylindrical, there is no problem of peeling as in the past.
Long-term use becomes possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is an external perspective view of the collet shown in Fig. 1, and Fig. 3 is a longitudinal sectional view showing another example. . 1... Casing, 4... Collet, 5... Spring, 9... Elastic member.

Claims (1)

[Scope of utility model registration request] a casing that has a tapered portion on the lower inner surface and is movable up and down and can rotate; a collet that is located inside the casing and has a slit formed in a substantially cylindrical body that can be opened and closed and is urged downward by a spring; It consists of a cylindrical elastic member fitted into the gripping hole of the collet, and by lowering the casing, the head of a rotated member such as a screw is fitted into the elastic member and the collet is closed. A clamping and rotating device that clamps and rotates a rotated member by rotating the casing.