JP2015150679A - gripping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gripping device for gripping a target object from inside an inner hole therein which can be implemented with a simple structure and is easy to maintain.SOLUTION: A gripping device 1 includes: a main shaft 21 having a first pressing part 23 with its tip having a large diameter; a base substrate 11 having an insertion hole 12 into which the main shaft 21 can be inserted; a second pressing part 13a that is located to face the first pressing part 23; a pressure introduction part 41 that makes the main shaft movable; and an elastic body 31 disposed between the first pressing part 23 and the second pressing part 13a. When the main shaft 21 is pulled from the pressure introduction part 41, the elastic body 31 is compressed between the first pressing part 23 and the second pressing part 13a, and an inner wall 2b of a target object 2 is pressure-welded so that the target object is gripped. Thus, a gripping device 1 for gripping a cylindrical target object 2 can be provided with a simple structure.

Description

  The present invention is a gripping device for gripping a cylindrical target body having an inner hole, and is mainly a cylindrical core material in which a base material such as a paper material, a resin, or a film is wound in a roll shape. It is related with what grasps from the inside.

  Like the production of cellophane tapes and sheets, the length of the roll-shaped product in which a base material such as paper, resin, film, etc. is wound around the gripped body, which is a cylindrical core material with an inner hole, is used. Need to cut.

There is a gripping device described in Patent Document 1 for gripping a cylindrical gripped body having an inner hole from its inside, which includes a support column, a grip portion made of an elastic body provided in the support column, and a pressure. It consists of an application part.
(For example, see Patent Document 1)

JP2013-240856A

  Another conventional technique is a mechanical gripping device such as a collet chuck. This is gripped from the outside by a claw or the like, but this means sometimes damages or deforms the gripped body. In addition, when mechanically gripping from the outside of the body to be gripped, the cutting efficiency or the like cannot be performed on the gripped portion, resulting in a decrease in production efficiency. Therefore, a gripping device that grips from inside the gripped body has been demanded.

  In addition, the prior art described in Patent Document 1 is gripped by using an elastic body from the inside of a cylindrical workpiece, and is achieved by a large-scale device such as pressing a support post to which a gripping unit is attached by a pressure application unit. It was possible and not a simple means. Moreover, the weight of the object to be gripped cannot be flexibly handled, and the maintenance is not efficient.

  The gripping device of the present invention grips a body to be gripped from the inside of its inner hole, and provides a gripping device that can be achieved with a simple configuration and is excellent in maintenance.

  Therefore, the gripping device of the present invention grips a cylindrical body to be gripped having an inner hole, and a main shaft having a first pressing portion at one end and a shaft body of the main shaft can be inserted. A base body having an insertion hole, an elastic body disposed in the vicinity of the tip of the main shaft, a pressure introducing portion that allows the main shaft to move within the insertion hole, and a second pressing portion at a position facing the first pressing portion The elastic body is arranged between the first pressing portion and the second pressing portion.

  Moreover, it is preferable to arrange a plurality of elastic bodies and arrange a rigid body between one elastic body and another elastic body.

  Further, it is preferable that the rotational force of the power unit is received from the power transmission unit and rotated while the gripped portion is gripped.

  According to the first aspect of the present invention, when the main shaft is pulled and moved to the pressure introducing portion side by the pressure introducing portion, the elastic body is compressed and deformed between the first pressing portion and the second pressing portion, It is pressed against the inner wall of the inner hole of the object to be gripped. The object to be grasped can be grasped from the inner surface side by the pressure contact of the elastic body. Since gripping is performed from the inside, there is no non-workable part like the collet chuck of the prior art, production efficiency is not reduced, and damage due to mechanical gripping can be prevented. Moreover, if it is a simple structure and uses a commercially available elastic O-ring as an elastic body, a maintenance will become easy. Moreover, the gripping force can be easily increased by increasing the elastic body due to the weight of the gripped body.

  According to the second aspect of the present invention, when a plurality of elastic bodies are used and a rigid body is interposed between the elastic bodies, one elastic body is a rigid first pressing portion, Rigid members such as the two pressing parts and the rigid body are always positioned and compressed on both sides. Thereby, even if it is a case where a some elastic body is used, the same compressive force can be applied and the stable holding | grip is attained.

  According to the third aspect of the present invention, it is possible to transmit the rotational power and rotate the gripping device itself, so that it can be used as it is for a cutting device for finally cutting a roll-like object around which a substrate is wound. become.

It is a perspective view which shows an example which attaches the holding | grip apparatus of this invention to a to-be-held body. It is ZZ sectional drawing of only the holding | gripping apparatus of FIG. It is the simplified sectional view showing an example when a to-be-held body contact | abuts to the holding | grip apparatus which concerns on 1st Example of this invention. It is the simplified sectional view showing the 2nd example of the present invention. It is the simplified sectional view showing the 3rd example of the present invention. It is the simplified sectional view showing the 4th example of the present invention. It is the simplified partial expanded sectional view which shows an example when a to-be-held body is hold | gripped with the holding | grip apparatus of this invention. It is the simplified sectional view showing an example when a power transmission means and a power part are attached to a grasping device of the present invention.

  A gripping device 1 of the present invention will be described with reference to the drawings. As shown in FIG. 1, a gripping device 1 according to the present invention grips a cylindrical target body 2 having an inner hole 2a. In this embodiment, the object to be grasped 2 is a cylindrical core material for winding a base material into a roll-shaped object 3. The grasped body 2 is not limited to such a cylindrical core material, and may be a cylindrical core material having an elliptical or polygonal cross section. Even if it is not cylindrical, only the position to which the gripping device 1 is attached may have a dent serving as a gripping portion on the inside thereof.

  The base material wound around the grasped body 2 is mainly a sheet-like material such as a paper material, a metal foil, a resin material, or a film. The wound base material becomes a roll-shaped object 3 and is cut by a cutting member such as a round blade according to the length to be used. The material of the gripped body 2 is mainly a thick paper material, but may be another material such as a plastic resin material.

  As shown in FIGS. 1 and 2, the gripping device 1 includes a base portion 11 covered with a cover 52, and a flange portion 54 having a large diameter on the distal end side (the right front side in FIG. 2) of the cover 52. And the fixing plate 51 are fixed. At this time, the flange portion 54 is located on the front surface side (right front side in FIG. 2) of the fixing plate 51, and many parts of the gripping device 1 pass through the opening portion of the fixing plate 51 and the back surface side (left back side in FIG. 2). ). Further, in the gripping device 1, an end portion 53 having a groove formed on the periphery on the side opposite to the fixing plate 51 is fixed to the end side of the base 11. With this configuration, the flange portion 54, the end surface 13 of the base body 11, and the tip end portion of the shaft body 22 of the main shaft 21 are located on the front surface side of the fixing plate 51, and Elastic O-rings 31 and 31 that are elastic bodies are arranged.

  As shown in FIG. 2, the gripping device 1 used in the present invention is mainly composed of a cylindrical base 11, a main shaft 21 inserted through an insertion hole 12 inside the base 11, and an elastic body arranged on the main shaft 21. The elastic O-rings 31 and 31 and a pressure introducing portion 41 disposed on the left side of the base 11 are configured.

  In the gripping device 1 of the present invention, an elastic O-ring 31 is disposed on a main shaft 21 that is detachably inserted into a base body 11, and the main shaft 21 is moved by a pressure introducing portion 41 so as to be pulled to the left rear side in FIG. Pressure is applied. Specifically, the pressure introducing portion 41 includes a hollow portion 42, a valve 44 disposed in the hollow portion 42, and a pressure shaft 43 that connects the valve 44 and the shaft body 22 of the main shaft 21. A valve 44 (not shown) connected to the cavity 42 moves the valve 44 to the left back side in the cavity 42, and moves the shaft body 21 to the left back side via the pressure shaft 43. The power source may be an air compressor other than the pump. By the movement of the main shaft 21, as will be described later, the elastic O-ring 31 is elastically deformed to press the inner wall 2b of the inner hole 2a of the gripped body 2 and grip the gripped body 2.

  A state in which the gripper 1 grips the gripped body 2 will be described with reference to the first to fourth embodiments. 3 to 8 showing these are different from FIGS. 1 and 2, using a simplified drawing for explanation, a state in which the grasped body 2 is brought into contact with the grasping device 1, that is, the tip of the shaft body 22. A state is shown in which the portion is inserted into the inner hole 2a of the grasped body 2 and the end surface 13 of the base 11 of the grasping device 1 and the end surface 8 of the grasped body 2 are brought into contact with each other.

  A first embodiment using a single elastic O-ring 31 will be described. As shown in FIG. 3, the base 11 is a cylindrical member having a predetermined thickness and having an insertion hole 12 for inserting the main shaft 21 therein. The main shaft 21 is formed with a first pressing portion 23 having a large diameter at its tip, and the first pressing portion 23 and the vicinity of the tip of the main shaft (see FIG. 2) protrude from the end surface 13 of the base 11 to the outside of the base 11. Then, it is inserted into the inner diameter 2a of the grasped body 2. The thickness of the substrate 11 may be such that the substrate 11 and the object to be grasped 2 come into contact with each other when the object to be grasped 2 is grasped from the viewpoint of stability of attachment. It suffices that at least a part of the end surface 8 of the substrate 11 on the substrate 11 side contacts with a part of the end surface 13 of the substrate 11 on the substrate 2 side.

  The insertion hole 12 inside the base body 11 has a length that allows the main shaft 21 to be inserted / removed. As described above, the shaft 22 of the main shaft 21 can be moved by the pressure introducing portion 41. The first pressing portion 23 in the present embodiment is formed at the tip of the shaft body 22 so as to have a larger diameter than the base body 11, so that the first pressing portion 23 is not inserted into the insertion hole 12. is there. Although this 1st press part 23 has shown what formed the front-end | tip of the shaft body 22 in large diameter, other forms, such as arrange | positioning a fixed piece at the front-end | tip of the shaft body 22, may be sufficient.

  In the first embodiment, a part of the end face 13 of the base body 11 on the gripped body 2 side becomes the second pressing portion 13 a that compresses the elastic O-ring 31. The second pressing portion 13 a has a shape capable of compressing the elastic O-ring 31 and needs to be at a position facing the first pressing portion 23. In the form of the second pressing portion 13a, in addition to the form like the end face 13 of the base 11, the end face 13 of the base 11 is formed in a flange shape so that the contact area with the elastic O-ring 31 and the end face 8 of the grasped body 2 is increased. It is good also as a form to increase.

  The elastic O-ring 31 serving as an elastic body is disposed through the periphery of the shaft body 22 so as to be disposed at the tip portion protruding from the base body 11 of the shaft body 22 of the main shaft 21. In this embodiment, the elastic body uses an annular elastic O-ring 31 and is made of a natural rubber material or a resin material. It is preferable that there is. Note that other materials may be used as long as they have elasticity, and the shape does not necessarily need to be circular or annular.

  The first pressing portion 23 and the second pressing portion 13a need to have a predetermined rigidity, but they only compress the elastic O-ring 31 and compress it. For example, when an elastic O-ring 31 made of resin is used, the first pressing portion 23 and the second pressing portion 13a are made of metal having a strength capable of compressing the resin.

  The above is the first embodiment when only a single elastic O-ring 31 is used. In the second embodiment shown below, a rigid O-ring is used as the second pressing portion 33 as shown in FIG.

  In the second embodiment, as shown in FIG. 4, a first pressing portion 23, an elastic O-ring 31, a second pressing portion 33 (rigid O-ring) having a large diameter at the tip of the shaft body 22 from the tip side of the main shaft 21. ) And the end face 13 of the base 11.

  According to the second embodiment, the elastic O-ring 31 is pressed by the second pressing portion 33 including the first pressing portion 23 and the washer-like rigid O-ring, so that the deformed portion of the elastic O-ring 31 is the shaft body 22. The inner wall 2b of the inner hole 2a of the gripped body 2 can be properly gripped without escaping between the base 11 and the base 11 and the gripped body 2.

  Next, a third embodiment will be described. In the third embodiment, unlike the second embodiment, a plurality of elastic O-rings 31 are arranged. As shown in FIG. 5, a plurality of elastic O-rings 31 are arranged on the shaft body 22, and a washer-like rigid O-ring 32 is arranged between one elastic O-ring 31 and another elastic O-ring 31. Thereby, the first shaft 23 having a larger diameter than that of the shaft body 22 from the right side of FIG. 4, the elastic O-ring 31, the rigid O-ring 32 that is a rigid body, The elastic O-ring 31, the second pressing portion 33 (rigid O-ring), and the end surface 13 of the base 11 are formed.

  According to this embodiment, by arranging a plurality of elastic O-rings 31, 31, the portion for gripping the inner wall 2 b of the inner hole 2 a of the body to be gripped 2 can be increased, the gripping force can be increased, and stable gripping can be achieved. to enable. Further, since a rigid O-ring 32 is disposed between the plurality of elastic O-rings 31, 31, a uniform pressing force can be applied.

  5 shows the case where two elastic O-rings 31 and 31 are used, but three or more elastic O-rings 31 and 31 may be used as shown in FIG. Also in this case, washer-like rigid rings 32 and 32, which are rigid bodies, are arranged between the elastic O-rings 31 and 31, respectively.

  A fourth embodiment of the present invention is shown in FIG. In the fourth embodiment, the first embodiment uses the first pressing portion 23 having the tip of the shaft body 22 having a diameter larger than that of the shaft body 22, and this tip is used as the ring fixing portion 24. The washer-shaped rigid O-ring is passed, and then the elastic O-ring 31 is disposed. Specifically, by passing the elastic O-ring 31 and the rigid O-ring through the shaft body 22, the main shaft 21 is arranged from the right side of FIG. 5, and the tip of the shaft body 22 has a larger diameter than the shaft body 22. Ring fixing portion 24, first pressing portion 34 (rigid O-ring), elastic O-ring 31, rigid body (rigid O-ring 32), elastic O-ring 31, second pressing portion 33 (rigid O-ring), base 11 End face 13 is formed. Also in this case, a plurality of elastic O-rings 31 may be used as in the third embodiment.

  According to this embodiment, the ring fixing portion 24 having a diameter larger than that of the shaft body 22 is merely for fixing the first pressing portion 34, and therefore the outer diameter of the ring fixing portion 24 is that of the rigid O-ring 32. What is necessary is just to be able to fix. Further, the elastic O-rings 31 and 31 are all compressed by the rigid O-rings 32, 33 and 34, so that more uniform compression is possible.

  The operation and use method of the gripping device 1 of the present invention will be described. As shown in the direction of the arrow line A in FIG. 1, a first pressing portion 23 and an elastic O-ring 31 having the tip of the shaft body 22 having a diameter larger than that of the shaft body 22 are formed in the inner hole 2 a of the cylindrical body 2. It inserts so that it may enter, and is made to contact | abut to the end surface 8 of the to-be-held body 2, and the end surface 13 of the base | substrate 11. FIG. At this time, it is preferable that the base | substrate 11 and the to-be-held body 2 are coaxial core shape.

  Then, a force for pulling the shaft body 22 of the main shaft 21 to the opposite side of the body to be gripped 2 is applied by the pressure introducing portion 41 shown in FIG. As a result, as shown in the direction of the arrow B in FIG. 7, the shaft body 22 is moved to the base 11 side, and the first pressing portion 23 and the second pressing portion 33 (rigid O-ring) on the end face 13 side of the base 11. The elastic O-ring 31, the rigid O-ring 32, and the elastic O-ring 31 are sandwiched between the two. When the elastic O-rings 31, 31 are further compressed, the object to be grasped 2 can be grasped by being deformed and pressed against the inner wall 2 b side of the inner hole 2 a of the object to be grasped 2. Note that the gripping device 1 shown in FIG. 7 is a third embodiment using three elastic O-rings 31, 31.

  As the elastic O-rings 31 and 31 and the rigid O-rings 32 and 32, commercially available general-purpose products can be used. Since they are simple means, they can be easily exchanged, and the cylindrical object 2 can be gripped by simple means. Is possible. Further, in order to increase the gripping force, the number of elastic O-rings 31 and 31 may be increased, and the gripping force can be easily changed depending on the weight of the gripped body 2.

  As shown in FIG. 8, power transmission units 5, 5 that transmit rotational power from a power unit 4 using a motor are arranged, and are in pressure contact with the surface (end surface) of the base body 11 via the rollers 6, 6. The substrate 11 and the grasped object 2 to be grasped can be rotated. In addition, since case 7 is being fixed via the bearing, case 7 itself does not rotate.

  By this rotation, the entire roll-shaped object 3 can be rotated, and cutting by a cutting part (not shown) can be performed according to the length to be used. Thereby, it becomes the holding apparatus 1 which is easy to use for rotation cutting.

DESCRIPTION OF SYMBOLS 1 ... Gripping device, 2 ... Body to be gripped, 3 ... Roll-shaped object, 4 ... Power part, 11 ... Base | substrate, 12 ... Insertion hole, 13 ... End surface, 13a ... Second press part, 21 ... Main shaft, 22 ... Shaft , 23 ... 1st pressing part, 24 ... Ring fixing part, 31 ... Elastic O-ring (elastic body), 32 ... Rigid O-ring (rigid body), 33 ... Second pressing part (rigid O-ring), 34 ... First Pressing portion (rigid O-ring), 41 ... pressure introducing portion, 42 ... hollow portion, 43 ... pressure shaft, 44 ... valve, 51 ... fixing plate, 52 ... cover, 53 ... end portion, 54 ... flange portion

Claims (3)

It grips a cylindrical object to be gripped having an inner hole,
A main shaft having a first pressing portion at one end;
A base body having an insertion hole through which the shaft body of the main shaft can be inserted;
An elastic body disposed near the tip of the main shaft;
A pressure introducing portion that allows the main shaft to move within the insertion hole;
Having a second pressing portion at a position facing the first pressing portion, and the elastic body is disposed between the first pressing portion and the second pressing portion,
A gripping device characterized by the above.   The gripping device according to claim 1, wherein a plurality of elastic bodies are arranged, and a rigid body is arranged between one elastic body and another elastic body.   The gripping device according to claim 1, wherein the gripping device rotates while receiving the rotational power of the power unit from the power transmission unit while gripping the gripped unit.

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