JPS62167919A - Roll holder - Google Patents

Abstract

PURPOSE:To reduce the time for replacing rolls by disposing a suitable number of engaging claws capable of rising and setting in the radial direction of a tube with the movement of a moving member, and providing an engaging piece always projecting in the radial direction of the tube on the other moving member. CONSTITUTION:As an engaging piece 34 of a roll holder 22 always projects over the peripheral surface of a hollow support tube 24, at the time of installing a roll body 14, the end portion of the roll body is brought into contact with the engaging piece 34 to be prevented from positioning outside the moving range of moving members 28, 30. When a reverse screwed shaft 26 is turned by a handle 46, the moving members 28, 30 approach each other, and simultaneously the moving member 28 moves through a through hole of a sleeve 48, so that an engaging piece 32 is expanded by a taper portion 28b. When the reverse screwed shaft is further turned, the sleeve 48 moves with the moving member 28, and inclined portions 32a, 34a enter an opening portion of a core 16 of the roll body 14 to fix the roll body 14 to the hollow support tube 24.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a roll holder, and more particularly, to a roll holder that is extremely easy to load and unload a web-wound roll;
Moreover, the present invention relates to a roll holder that can automatically center the roll in the web feeding direction when loading the roll.

Prior Art Single webs of long paper, films, metal foils, etc., composite sheets such as laminated films (hereinafter simply referred to as "webs")
A roll body made by winding a material (called ``synthesis'') around a hollow core is widely used in various industrial fields for various purposes. For example, in a bag making, filling and packaging machine, a roll body made by winding up a synthetic resin web as a packaging material is loaded into a predetermined position within the machine frame, and the web is continuously fed out to form a bag body. Various pillow packaging bags are manufactured by filling the bag with articles. In this type of packaging machine, when the original roll is used up, it is necessary for an operator to replace it with a new roll.

In the conventional roll exchange, a roll holder of the form shown in FIG. 5 was used. That is, an abutment block 12 having a conical taper is fixed to a support shaft 10 whose one end is rotatably held in a machine frame (not shown), and the winding core 16 of the roll body 14 is inserted through this support #10. After fitting one opening of the winding core 16 into the conical surface of the block 12 and abutting it, another conical block 18 is inserted into the support shaft 10. Then, the conical surface of the block 18 is inserted and fitted into the other opening of the winding core 16, and both blocks 12.
The roll body 14 is held between the blocks 18 and the block 1
8 by rotating the handle 2o attached to the block 18.
By fixing to the support shaft 10, the roll body 14 is attached to the support shaft 10.

The problem that the invention seeks to solve However, according to the roll holder having the structure described above.

Remove the conical block 18 every time the roll is replaced.

After the roll body 14 is fitted into the block 12 and abutted,
Lift up the fairly heavy roll body so that the centers of the roll body 14 and the support shaft 10 coincide with each other, and W! 4 m, and then it was necessary to install the block 18, which required an extremely complicated operation.

Also, due to the order change of the web, the roll body 14
If the width of the roll body 14 is changed, it is necessary to center the roll body 14 in the web feeding direction and adjust it so that the web is not fed out unevenly to the left or right, and this adjustment requires skill and time. It required

OBJECTS OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the roll holders according to the prior art, and has been proposed to suitably solve these problems. It is an object of the present invention to provide a roll holder having a novel configuration that can automatically center the roll body.

Means for Solving the Problems In order to achieve the above object, the roll holder according to the present invention has the following features: A plurality of through-long grooves extending in the longitudinal direction are bored at a required center angle on the circumferential surface of the tube body, and the roll holder is provided with a web-wrapped roll. With a hollow support tube that removably supports the extrapolation.

a reverse screw shaft that is rotatably inserted and supported within the hollow support tube with its axes aligned and rotated in forward and reverse directions by a rotation means; and a rotational action of the reverse screw shaft that is screwed into the reverse screw shaft. A pair of moving members are provided below, which are guided by the long through groove of the hollow support tube and can move toward and away from each other. An appropriate number of locking pawls that can be protruded and retracted in the radial direction are provided on the other movable member, and a locking piece that always projects outward in the radial direction of the tube body from the long through groove is provided on the other movable member. It is characterized by

Embodiments Next, preferred embodiments of the roll holder according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a roll holder according to an embodiment of the present invention, in which a roll holder 22 is inserted into and supported by a hollow support tube 24 with its axis aligned with the hollow support tube 24. A threaded shaft 26 and a shaft 1 mounted relative to the reverse threaded shaft 26.
It basically consists of a pair of moving members 28, 30. That is, the hollow support tube 24 is as shown in FIG.

For example, the support tube 2 is horizontally and rotatably supported at an appropriate location (loading location for web winding rolls) of a bag-forming-fill-sealing machine.
By inserting the winding core 16 of the roll body 14 through the free end portion of the roll body 4, the roll body 14 can be detachably supported. On the circumferential surface of the hollow support tube 24,
As shown in FIG. 3, through-long grooves 36 and 38 extending in the longitudinal direction for guiding the locking claws 32 and locking pieces 34, which will be described later, have a total central angle of 120° in the circumferential direction of the hollow support tube 24. Three holes have been drilled.

A reverse threaded shaft 26 is rotatably inserted and supported inside the hollow support tube 24 with its central axis aligned with the tube body.

That is, the reverse threaded shaft 26 is provided with a male thread 40, 42 which is threaded as a reverse thread, and is supported by a bearing 44° 44 disposed at the longitudinal end of the inside of the hollow support tube 24 so as to be able to rotate freely once. A handle 46 as a rotating means is attached to the left end of the reverse threaded shaft 26 (on the free end side of the hollow support tube 24), and by manually rotating the handle 46, the reverse threaded shaft 26 can be rotated. It is designed to rotate in forward and reverse directions.

As shown in FIG. 2, a pair of movable members 28, 30 formed by threading internal threads of internal threads are respectively screwed into the male threads 40, 42 of the reverse threaded shaft 26 in a corresponding manner. The one moving member 28 has one cylindrical portion 28 as shown in FIG.
a, a tapered portion 28b consisting of a cone with a larger diameter,
A sleeve 48, which includes a flange portion 28c and a locking pawl 32, which will be described later, is slidably fitted into the cylindrical portion 28a. On the free end side of the cylindrical portion 28a,
A U to prevent the sleeve 40 fitted therein from falling off.
Ring 50 is attached. Bolts 52 can be screwed onto the outer circumferential surface of the flange portion 28c at positions corresponding to the three long through grooves 36, and the bolts 52 are made to face the long through grooves 36 within the hollow support tube 24. The rotation of the moving member 28 is thereby restricted.

The moving member 30 screwed onto the right side of the reverse screw 26 is formed of a cylindrical body, and a total of three locking pieces 34 projecting in the radial direction are fixed to the circumferential surface of the moving member 30 at a center angle of 120 degrees. This locking piece 34 is attached to the hollow support tube 24 at a center angle of 120°.
Facing into the three long through grooves 38 drilled in
The dimensions are set so that the movable member 3o always protrudes in the radial direction from the movable member 8, so that the movable member 3o can travel in the longitudinal direction and restrict rotation in the circumferential direction. Therefore, the reverse threaded shaft 2
6, the moving member 28.6 is rotated under the reverse screw action.
It will be appreciated that the tubes 30 move relatively closer and further apart within the hollow support tube 24.

Next, a mechanism for expanding the locking pawl 32 that is attached to the movable member 28 will be explained. As is clear from FIGS. 1 and 2, the locking pawl 32 is composed of a plate material having an inclined portion 32a, a contact portion 32b, and a sliding portion 32c, and is rotatably pivoted to the sleeve 48 at its base. has been done. That is, as shown in FIG. 1, a total of three slits 5 are formed on the outer peripheral surface of the sleeve 48 at intervals of 120° in the circumferential direction.
4, and by inserting the pin 56 through the slit 54 and the base, each of the locking pawls 32 is rotatably pivotally attached to the sleeve 48. Ru. Further, the three locking claws 32 include the locking claws 32 .
so that it does not always protrude from the long through groove 36 of the hollow support tube 24.

An O-ring 60 made of an elastic material is wound around the locking pawl 3.
2 is always urged toward the center of the hollow support tube 24. Note that in the closed state of the locking claw 32, the abutting portion 32c of the locking claw 32 is.

The sleeve 48 is dimensioned so as to slightly face into the long through groove 36, thereby restricting rotation of the sleeve 48.

The sleeve 48 is inserted into the hollow support tube 24 while being slidably fitted onto the movable member 28. At this time, two annular grooves formed on the outer periphery of the sleeve 48 have grooves.
O-ring 58 that can contact the inner wall of the hollow support tube 24.
58 are respectively fitted, and at the beginning of the movement of the moving member 28,
The sleeve 48 itself is subjected to resistance due to friction between the circle ring 58 and the inner wall of the tube, so that movement in the axial direction is restricted. When the movable member 28 moves in a direction approaching the sleeve 48 whose movement is restricted, the locking pawl 32 engages the tapered portion 28b of the movable member 28.
The sliding contact portion 32c has settled down.

Due to the wedge effect, the locking pawl 32 expands radially outward and finally projects from the long through groove 36.

Note that the sliding contact portion 32c is the flange portion 2 of the moving member 28.
8c, the contact portion 32b of the locking claw 32 protrudes from the circumferential surface of the hollow support tube 24 at right angles, as shown in FIG.

Furthermore, three locking pieces 34 are fixed to the other moving member 30 as described above. This locking piece 34 is formed with an inclined surface 34a and a vertical surface 34b, and the end of the core 16 of the roll body 14 is pressed by the vertical surface 34b. Further, since the locking piece 34 always protrudes from the circumferential surface of the hollow support tube 24, when the roll body 14 is inserted into the hollow support tube 24, the vertical surface 34b
This serves as a stopper for 4.

The male threads 40.42 of the reverse threaded shaft 26 and the corresponding female threads of the moving member 28.30 are threaded at the same pitch. Therefore, the amount of movement of the movable member 28 and the movable member 30 when the reverse screw shaft 26 rotates is the same, and as a result, the center of the roll body 14 held between the locking pawl 32 and the locking piece 34 in the web feeding direction is automatically It will be determined based on the

Next, the function of the roll holder according to the present invention will be explained.

In the roll holder 22 according to the present invention, the roll body 14
When it is removed, there are three locking claws 3 as shown in Figure 2.
2 does not protrude from the circumferential surface of the hollow support tube 24, so that the roll body 14 can be easily inserted into the hollow support tube 24. In this case, the locking piece 34 arranged in the direction of the outer insertion of the roll body 14 always protrudes from the circumferential surface of the hollow support tube 24, so that the end of the roll body 14 will eventually be connected to this locking piece. 34 and is prevented from moving, thereby preventing the movable members 28, 30 from being located outside the range of movement.

After the roll body 14 is inserted into the hollow support tube 24, the handle 46 attached to the end of the reverse threaded shaft 26 is manually operated to rotate the reverse threaded shaft 26 in a predetermined direction. .30 in a direction closer to each other. At the beginning of the movement of the moving member 28, the sleeve 48 fitted into the moving member 28 does not move due to the frictional resistance between the O-rings 58, 58 and the inner wall of the hollow support tube 24, and does not move through the through hole of the sleeve 48. Only the moving member 28 moves in the axial direction.

That is, the tapered portion 28b formed on the moving member 28
Due to the wedge effect, the locking pawls 32 are expanded radially outward and protrude from the circumferential surface of the hollow support tube 28. The sliding contact portion 32c of the locking pawl 32 is connected to the movable member 2.
The expansion is stopped by contacting the flange portion 28c.

If you further rotate the reverse screw 4i11126, the sleeve 4
8 moves in the axial direction together with the moving member 28 against the frictional resistance between the O-rings 58, 58 and the inner wall of the hollow support tube 24 due to the axial pressing force of the moving member 28. Then, the inclined portions 32a and 34a formed on the locking claw 32 and the locking piece 34 are inserted and fitted into the opening of the winding core 16 of the roll body 14 as the moving member 28.30 moves. Furthermore, a pressing force in the axial direction acts, and as shown in FIG. 4, the locking pawl 32
The contact portion 32b and the vertical portion 34b of the locking piece 34 are pressed against the open end of the winding core 16, and the roll body 14 is reliably loaded and fixed to the hollow support tube 24.

Next, when removing the roll body 14, the handle 46
By rotating in the opposite direction, the surface moving member 28.3
0 are moved away from each other. At this time, the locking pawl 32 is always urged in the closing direction by the O-ring 60, so as the movable member 28 moves, it slides into the hollow support tube 24 while slidingly contacting the tapered portion 28b of the movable member 28. He will die. Therefore, the force pressing the roll body 14 in the axial direction is released, so that the roll body 14 can be easily removed.

Note that the sleeve 48 fitted into the moving member 28 is attached to the O-rings 58, 58 at the beginning of the movement of the moving member 28.
Because of the frictional resistance, it does not move inside the hollow support tube 24. However, when the moving member 28 moves further, the U-ring 50 attached to the moving member 28 comes into contact with the end of the sleeve 48 and moves in the hollow support tube 24 in the same manner as the moving member 28.

According to the roll holder according to the present invention as described in detail,
Unlike conventional holders, it does not require a series of complicated operations such as removing the conical block and aligning the central axis of the inserted roll body every time the roll is replaced, and even someone without particular experience can use it. This allows for easy roll replacement work. Furthermore, even when the width of the roll body is changed due to an order change, the center of the web in the feeding direction can be automatically determined, and the time required for replacing the rolls can be reduced. Therefore, the time during which production line operations are stopped can be minimized.

It has advantages such as being able to improve production efficiency.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a roll holder according to the present invention, and FIG.
The figure is a longitudinal sectional view taken at a central angle of 120°, showing a roll holder according to the present invention in a state where it is waiting to be loaded with a web winding roll; FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2; FIG. 4 is a vertical cross-sectional view of the roll holder according to the present invention, cut at a central angle of 120°, in a state in which a web winding roll is loaded and held, and FIG. 5 is an explanatory diagram of the roll holder according to the prior art. .

Claims (3)

[Claims] (1) A hollow support tube in which a plurality of long through grooves (36, 38) extending in the longitudinal direction are bored at a required central angle on the circumferential surface of the tube, and the web winding roll (14) is removably inserted and supported on the outside. (24
), a reverse threaded shaft (26) which is rotatably inserted and supported within the hollow support tube (24) with its axes aligned and rotated in forward and reverse directions by a rotating means (46); (26) and is screwed into the reverse threaded shaft (26).
) of the hollow support tube (24).
a pair of moving members (28, 30) that can be moved close to and apart from each other while being guided by the moving members (28, 38);
) from the through-long groove (36) to the tube body (24).
) are provided with an appropriate number of locking pawls (32) that are retractable in the radial direction, and the other movable member (30) is provided with the long through groove (38).
) is provided with a locking piece (34) that always projects outward in the radial direction of the tube body (24). (2) The roll holder according to claim 1, wherein the rotating means (46) is a manually rotated handle. (3) The locking pawl (32) is pivotally supported by a sleeve (48) that is slidably inserted over the moving member (28) within a predetermined range, and is configured to be rotatable in the radial direction. A roll holder according to claim 1.