JP2888196B2 - Core holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding shaft for winding a web such as paper or film, and more particularly to a core holder constituting a winding shaft for winding a large number of webs individually and frictionally on the same axis. is there.

[0002]

2. Description of the Related Art Generally, a number of individual friction core holders of a fixed length are arranged side by side on a coaxial axis for each individual friction winding shaft in a slitter. As such a core holder, Japanese Patent Publication No. 1-15459 filed by the applicant of the present invention is provided with an outer cylinder so as to be able to protrude and retract in the radial direction of the cylinder from windows formed at a plurality of locations along the circumferential direction. Claw, and a claw support member that supports the claw inside the outer cylinder and is displaceable to the outside in the cylinder radial direction by air pressure. The claw protrudes from the outer surface of the outer cylinder by air pressure and is fitted to the outer cylinder outside. There is disclosed a structure in which the provided core is fixed to the outer cylinder by a claw pressed against the inner surface thereof.

The core holder has a feature that a core (winding roll) having an arbitrary width can be fixed at an arbitrary position on a shaft, and only the core can be attached and detached without disassembling other parts. However, in the core holder, the slit width may sometimes cause the nail of the core holder to be very slightly attached to the core, thereby damaging the end of the core and scattering the paper dust of the core. Disadvantages occur. In addition, the core holder cannot cope with a demand for adjusting a ratio of a torque to a slit width or winding with a particularly small torque.

In order to solve the above problem, it is necessary to adopt a configuration in which the claws of a specific core holder do not lock the core. As such, the present applicant has proposed a new winding shaft in Japanese Patent Publication No. 5-81503. In this winding shaft, another outer cylinder having a window in which a claw can be protruded and retracted is fitted on the outer cylinder of the core holder constituting the same so as to be displaceable in the circumferential direction, and the two outer cylinders are relatively displaced. By rotating so that the phases are shifted in phase, it is possible to select between a state in which the projection of the nail from the outermost outer cylinder is allowed and a state in which the projection of the nail is prevented.

[0005]

However, in the conventional core holder using another outer cylinder, the outer cylinder has to be very thin because of its dimensional restrictions, resulting in a high cost for processing. And it is difficult for the operator to rotate the cylindrical outer cylinder having a large diameter.

Further, the outer cylinder may rotate spontaneously when the operation is stopped or during idling without supplying air pressure, for example. There was a risk that the blocking state might change in an unwanted direction without your knowledge. Further, in the conventional core holder, there is a problem that the screw to which the claw is attached is loosened during operation, and the screw and the claw fall off.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily and reliably select a state in which the projection of the pawl from the outer surface of the outer cylinder is permitted and a state in which the projection of the pawl is prevented with a simple structure. An object of the present invention is to provide a core holder in which a nail, a mounting member thereof and the like do not easily fall off.

[0008]

In order to solve the above-mentioned problems, a core holder according to the present invention is provided so that an outer cylinder can freely move in and out in a radial direction of a cylinder from windows formed at a plurality of locations along a circumferential direction of the outer cylinder. And a claw supporting member that supports the claw inside the outer cylinder and is displaceable to the outside in the cylinder radial direction by air pressure. The claw protrudes from the outer surface of the outer cylinder by air pressure, and the outer cylinder outer side. In a core holder in which a core fitted into the core is fixed to an outer cylinder by a claw pressed against its inner surface, the claw is rotatably supported on a claw support member via a rotation shaft in a cylinder radial direction. At the same time, a pair of projections is provided at the bottom of the claw that can be engaged with the inner surface of the outer cylinder and the window at a position symmetrical with respect to the rotation axis. By changing the engagement position, the outer cylinder Is characterized in that protruding state and claw protruding nails from the surface is allowed to allow selection of the condition to be prevented.

In the above configuration, since each pawl is rotatably supported by the pawl support member via the rotating shaft, unlike the conventional screwing with a screw, it is caused by the loosening of the screw. The nails do not fall off.

The pair of projections limit displacement of the pawl with respect to the outer cylinder in the radial direction of the cylinder when air pressure is supplied. The limit position depends on the engagement position of the projections on the inner surface of the outer cylinder. I do.

When the projections are arranged in the cylinder axis direction by rotating the pawl, the projections can be engaged with the inner surface of the outer cylinder along a straight line parallel to the cylinder axis. The state in which the projection of the claw is allowed to the maximum is obtained. In this state,
When air pressure is supplied to the core holder, the claw support member is urged outward in the radial direction of the cylinder, and the claw projects from the outer surface of the outer cylinder to lock the core fitted to the outer cylinder to the outer cylinder.

When the projections are disposed in a direction perpendicular to the cylinder axis by rotating the pawl 90 degrees from the above state, the projections can be engaged with the inner surface of the outer cylinder along an arc. Then, the claws sink down from the outer surface of the outer cylinder, and the projection of the claws from the outer surface of the outer cylinder is completely prevented. In this state, even if air pressure is supplied to the core holder and the claw support member is urged outward in the cylinder radial direction, the claw is prevented from protruding from the outer surface of the outer cylinder, so that the claw is fitted to the outer cylinder outer side. Never detain a core.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1A and 1B show a core holder according to an embodiment of the present invention in a state in which a nail is allowed to protrude from an outer surface of an outer cylinder. FIG. 1A is a plan view of the core holder, and FIG. . 2A and 2B show a core holder according to the embodiment of the present invention shown in FIGS. 1A and 1B in a state in which a projection of a claw from an outer surface of an outer cylinder is prevented, FIG. It is sectional drawing. FIG. 3 is a perspective view of a nail used in the core holder shown in FIGS.

In FIG. 1, an outer cylinder 1 of each core holder is shown.
Windows 2 are drilled at a plurality of locations along the circumferential direction at the center of the center, and claws 3 are loosely fitted in the respective windows 2 so as to be freely protruded and retracted in the radial direction of the cylinder.
Each pawl 3 is rotatably supported by a rectangular leaf spring 6 serving as a pawl supporting member via a rivet 5 in a cylindrical radial direction as a rotating shaft fitted in a mounting hole 4 at the center thereof. An operation hole 7 for engaging the rotating jig is formed in the surface so as to penetrate two places with the mounting hole 4 interposed therebetween, and the leaf spring 6 is loosely fitted in a groove on the inner surface of the outer cylinder 1. A pair of projections 8 are provided at the bottom of the claw 3 at both ends symmetrical with respect to the operation hole 7 or the rivet 5, and these projections 8 can be engaged with the inner surface of the outer cylinder 1 with the window 2 interposed therebetween. . Further, a rubber tube 9 is provided inside the core holder, and both side surfaces of the tube 9 are sealed by a known method for each core holder so that air does not leak. In addition, since a known mechanism is applied to the configuration other than the above in the core holder,
The description and illustration thereof are omitted.

In the core holder having the above-described structure, a rotating jig (not shown) is engaged with the operation hole 7 on the top surface of the pawl 3 when the air pressure is not supplied to the tube 9 so that the pawl 3 is moved around the rivet 5. By rotating the projection 8 by a predetermined angle, as shown in FIG.
Can be engaged with the inner surface of the outer cylinder 1 along a straight line parallel to the cylinder axis, and the projection of the claw 3 from the outer surface of the outer cylinder 1 is allowed to the maximum. In this case, a sufficient projection stroke of the claw 3 Is not exceeded.
In this state, when air pressure is supplied to the tube 9, the tube 9 expands, whereby the leaf spring 6 is pushed up in the radial direction of the cylinder and the pawl 3 protrudes from the outer surface of the outer cylinder 1. When a core (not shown) is fitted, the claws 3 bite into the inner surface of the core and lock the core to the outer cylinder 1. In this state, when the supply of air pressure to the tube 9 is stopped, the tube 9
Is contracted, the pawl 3 sinks down from the outer surface of the outer cylinder 1 by the restoring force of the leaf spring 6 inward in the cylinder radial direction, and the lock of the core on the outer cylinder 1 is released.

Further, when the air pressure is not supplied, the pawl 3 is rotated by 90 degrees from the protruding allowable state, whereby
As shown in FIG. 2, when both projections 8 are arranged in a direction perpendicular to the cylinder axis direction, both projections 8 can be engaged with the inner surface of the outer cylinder 1 along an arc, and the claw 3 is moved in the cylinder radial direction As a result, the claw 3 protrudes from the outer surface of the outer cylinder 1 and is completely blocked. In this state, even if air pressure is supplied to the tube 9 and the leaf spring 6 is urged outward in the radial direction of the cylinder, since the claw 3 is prevented from protruding from the outer surface of the outer cylinder 1, There is no binding of the fitted core.

To rotate the pawl 3 as described above, the pawl 3
Since there is sufficient resistance due to the tightening force of the rivet 5 between the plate spring 6 and the rivet 5 and the frictional force between the two projections 8 and the inner surface of the outer cylinder 1, there is no possibility that the claw 3 will rotate by itself. The spring 6 is provided with small circular projections (not shown) which can be fitted to the respective operation holes 7 in the protruding permissible state and the protruding preventing state of the pawl 3 so as to be fitted thereto. The pawl 3 is fixed to the leaf spring 6 by a well-known snap action at each angular position corresponding to each of the above-mentioned states, so that the pawl 3 is stabilized so as to provide resistance to movement.

It is needless to say that the structure of the core holder can be applied not only to the individual friction winding shaft, but also to an air shaft for simply fixing the core. Further, in the above embodiment, the claw 3, the inner surface of the outer cylinder 1, and the like can be appropriately modified into another shape as long as the above-mentioned action can be obtained.

[0019]

Since the core holder according to the present invention is constructed as described above, it is possible to simply select the state in which the projection of the claw from the outer surface of the outer cylinder is allowed and the state in which the projection of the claw is prevented. With the structure, it can be carried out easily and reliably, and the nails and their attachment members do not easily fall off.

[Brief description of the drawings]

FIG. 1 shows a core holder according to an embodiment of the present invention, in which a projection of a claw from an outer surface of an outer cylinder is allowed;
(A) is a plan view thereof, and (B) is a sectional view of an essential part thereof.

FIGS. 2A and 2B show a core holder in a state in which a claw is prevented from protruding from an outer surface of an outer cylinder according to the embodiment of the present invention shown in FIG. 1, wherein FIG. It is a fragmentary sectional view.

FIG. 3 is a perspective view of a claw used in the core holder shown in FIGS. 1 and 2;

[Explanation of symbols]

 Reference Signs List 1 outer cylinder 2 window 3 claw 4 mounting hole 5 rivet (rotating shaft) 6 leaf spring (claw support member) 7 operation hole 8 protrusion 9 tube

Claims (1)

(57) [Claims] A claw provided in the outer cylinder so as to be able to protrude and retract in a radial direction of the cylinder from windows formed at a plurality of positions along a circumferential direction of the outer cylinder; A claw support member provided so as to be displaceable to the outside in the direction, the claw protruding from the outer surface of the outer cylinder by air pressure, and the core fitted outside the outer cylinder is restrained by the claw pressed against the inner surface of the outer cylinder. In the core holder, the pawl is rotatably supported by the pawl support member via a pivot shaft in the cylinder radial direction, and the inner surface of the outer cylinder and the window are sandwiched between the pawl bottom and the symmetrical position with respect to the pivot axis. By providing a pair of projections that can be engaged with each other, and by rotating the claw about the rotation axis to change the engagement position of both projections on the inner surface of the outer cylinder, the projection of the claw from the outer surface of the outer cylinder is allowed. Selection between the state and the state where the nail is prevented from protruding Core holder being characterized in that to enable.