JPH0726280Y2 - Paper tube chuck that is mounted on the sheet winder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paper tube chuck for mounting a paper tube on a rotary shaft of a sheet winder.

[Conventional technology]

As one of the conventional paper tube chucks, there is one using a cutting blade. This is a structure in which a plurality of cutting blades are attached to the chuck body along the axial direction of the paper tube, and the cutting blades are pierced into the end surface of the paper tube.

However, when using this chuck with a cutting blade, the cutting blade breaks during use, and as a result, the transmission of rotational torque becomes non-uniform along the circumferential direction of the paper tube, making it difficult to wind the sheet. It is also extremely dangerous to handle a sheet wound on a paper tube while having a bad influence or having a broken cutting edge stuck to the end surface of the paper tube.

As another form of the paper tube chuck, there is a configuration in which a plurality of claw members arranged along the circumferential direction are pressed against the inner peripheral surface of the paper tube to clamp the paper tube. There is no problem that the end face of the paper tube is damaged or the cutting blade is broken like a chuck using a cutting blade, but on the inner peripheral surface of the paper tube, only the claw part is localized. The circularity of the paper tube is impaired because the paper is pressed by and the clamping force is not so large. When the roundness of the paper tube is impaired, the winding tension of the sheet during one rotation changes subtly, and the sheet cannot be properly wound at a constant tension. The winding appearance also becomes worse.

[Problems to be solved by the device]

The present invention has a structure in which the paper core is clamped over the entire circumference of the inner peripheral surface of the paper core while the paper core is centered, so that the roundness of the paper core is not impaired and a large clamping force is applied. The problem was to make it possible to clamp the paper tube.

[Means for Solving the Problems]

The paper tube chuck according to the present invention has a rotary shaft having a plurality of tapered grooves axially provided at the tip thereof; and a pressing portion having an arcuate pressing surface pressed against the inner peripheral surface of the paper tube as a leg. A plurality of pressing bodies that are integrally provided on the lower part of the leg portion and have a tapered surface corresponding to the tapered groove of the rotating shaft on the lower surface of the leg portion; A pressing body guide ring, which is provided with a flange portion elastically contacting the end surface, and in which a plurality of guide holes into which the legs of the pressing body are inserted are provided in the main body in a radial direction; Both stroke ends are regulated by stopper portions provided at both ends of the tapered groove, and the pressing body guide ring slidably fitted in the portion of the rotating shaft where the tapered groove is provided is rotated. Urging means for urging the tip surface side of the A leg portion is inserted into each guide hole of the pressing body guide ring fitted to the shaft, and the lower end portion of the leg portion is fitted to the outer periphery of each pressing body fitted to the taper groove of the rotary shaft. And an annular elastic body for connecting the pressing bodies to each other to keep them in the most retracted state.

[Function of device]

A pressing body guide ring is slidably fitted in a portion of the end of the rotary shaft where the taper groove is provided, within a constant stroke, and a guide provided along the radial direction on the body of the pressing body guide ring. The leg portion of the pressing body is inserted into the hole, and the taper surface of the lower surface of the leg portion is fitted into the taper groove provided at the end of the rotary shaft.

Therefore, when the rotation shaft is moved forward, the flange portion of the pressing body guide ring slidably fitted in the tip end portion thereof elastically contacts the end surface of the paper tube. When the rotating shaft is further advanced, the pressing body guide ring is in elastic contact with the end face of the paper tube and cannot move forward. Therefore, due to the advancing of the rotating shaft, the pressing body guide ring moves behind the rotating shaft relative to the rotating shaft. By moving to the end side, each pressing body projects in the radial direction of the rotating shaft. As a result, the arcuate pressing surface provided on the upper surface of each pressing body comes into contact with and presses the inner peripheral surface of the paper tube, and the paper tube is clamped.

Since an arc-shaped pressing surface is provided on the upper surface of each pressing body, when the inner peripheral surface of the paper tube is pressed by a plurality of pressing bodies, the pressing surface is pressed almost all around the inner peripheral surface of the paper tube. The body comes into contact and the paper tube is clamped, and moreover, the plurality of pressing bodies project in the same amount in the radial direction of the rotation axis in synchronization with each other, so if the inner peripheral surface of the paper tube is clamped by this, The paper tube is automatically centered. Therefore, the paper tube can be clamped without impairing the roundness.

In addition, since the taper surface is used to generate the clamping force, a wedge action occurs and the clamping force generated is increased.

Further, the pressing body guide ring is urged toward the front end surface side of the rotating shaft by the urging means, and the plurality of pressing bodies inserted in the respective guide holes of the pressing body guide ring are annular elastic bodies. Since they are connected to each other and are in the most retracted state, when the rotary shaft is retracted, the pressing body guide ring that is in elastic contact with the end face of the paper tube has the tip of the rotary shaft relatively to the rotary shaft. It moves to the surface side, whereby each pressing body is gradually retracted, and the paper tube clamp is released.

〔Example〕

Hereinafter, the paper tube chuck according to the present invention will be described in more detail with reference to examples.

1 to 3, at the tip of the rotary shaft 1,
Three taper grooves 2 of the same shape are provided in the axial direction at equal intervals along the circumferential direction.

The tapered groove 2 is tapered so that the depth of the groove increases toward the end surface of the rotary shaft 1. A flange portion 4 for abutting the stopper plate 3 is projectingly provided on the inner end of the rotary shaft 1 where the tapered groove 2 is formed.

The pressing body guide ring 5 is provided with a paper tube P at one end of a ring-shaped main body 6.
Is integrally provided with a flange portion 7 elastically contacting the end face of the main body 6, and three guide holes 8 are provided in the main body 6 along the radial direction at equal intervals along the circumferential direction. Three spring holes 9 are provided along the axial direction, and a spring groove for inserting the annular spring 11 on the outer peripheral surface of the main body 6.
12 is a structure provided along the circumferential direction. Both sides of the guide hole 8 in the main body 6 are formed in a flat shape.

The pressing body 13 has a leg 14 having an arc-shaped pressing surface 15
16 is integrally provided, and the lower surface of the leg portion 14 is formed to be a tapered surface 17 corresponding to the tapered groove 2 of the rotary shaft 1. The pressing portion 16 of the pressing body 13 is provided with a spring groove 18 along the circumferential direction, and the pressing surface 15 thereof is provided.
Is provided with non-slip unevenness along the axial direction.

After the stopper plate 3 is fitted on the rotary shaft 1, the pressing body guide ring 5 is fitted, and the leg portions 14 of the pressing body 13 are inserted into the guide holes 8 provided in the pressing body guide ring 5, respectively. When the lower end of the leg portion 14 is fitted in the taper groove 2 of the rotary shaft 1 and the annular spring 11 is inserted into the spring grooves 18 and 12 provided in the pressing body 13 and the pressing body guide ring 5, respectively. The pressing bodies 13 are connected to each other and are in the most retracted state.

Then, a return spring 19 is inserted into each spring hole 9 of the pressing body guide ring 5, a spring contact plate 21 is attached to the end surface of the pressing body guide ring 5 with a bolt 22, and a stopper plate is attached to the end surface of the rotary shaft 1. When 23 is attached by the bolt 24, the pressing body guide ring 5 becomes slidable between the stopper plate 3 and the stopper plate 3 and is urged by the return spring 19 toward the tip surface side of the rotary shaft 1. It

A fixedly mounted frame, as shown in FIG.
A sliding guide cylinder 27 is rotatably supported by 25 via a bearing 26, and the rotary shaft 1 is fitted in the sliding guide cylinder 27 so as to be slidable in the axial direction. Are connected to each other and rotate integrally. Further, at the rear end of the rotary shaft 1, an advance / retreat guide cylinder 32 is mounted via bearings 29, 31, and a cylinder 33 fixed to the frame 25 is provided.
The rod 34 and the advancing / retreating guide tube 32 are connected via an arm 35. Therefore, when the rod 34 of the cylinder 33 is moved in and out, the rotary shaft 1 moves back and forth along the axial direction.

2 and 3 show a state in which the rotary shaft 1 is located at the retracted end. In this state, the rod 34 of the cylinder 33
When retracted, the rotary shaft 1 moves forward, and as shown by the chain double-dashed line in the figure, most of the pressing body guide ring 5 is inserted into the inside of the paper tube P, and the collar portion 7 thereof is Make elastic contact with the end face of P. When the rotating shaft 1 further advances, the pressing body guide ring 5 cannot move further than this position, and therefore the rear end surface of the rotating shaft 1 is relatively moved with respect to the rotating shaft 1 against the restoring force of the return spring 19. To the side, whereby each pressing body 13 projects in the radial direction of the rotary shaft 1, and as shown in FIGS. 4 and 5, an arc-shaped pressing surface 15 provided on the upper surface of the pressing body 13.
Touches the inner peripheral surface of the paper tube P and presses it. As a result, the paper tube P is clamped.

Since the arc-shaped pressing surface 15 is provided on the upper surface of each pressing body 13, the inner peripheral surface of the paper tube P is pressed when the inner peripheral surface of the paper tube P is pressed by the plurality of pressing bodies 13. The pressing body 13 is contacted and clamped on almost the entire circumference of the
Are projected in the same amount in the radial direction of the rotary shaft 1 in synchronism with each other. Therefore, if the inner peripheral surface of the paper tube P is clamped by a plurality of pressing bodies 13, the paper tube P is automatically centered. . Therefore, the paper tube P can be clamped without impairing the roundness. In addition, since the taper surface is used to generate the clamping force, a wedge action occurs and the clamping force generated is increased.

Further, the pressing body guide ring 5 is urged toward the tip end surface side of the rotating shaft 1 by the return spring 19, and a plurality of pressing bodies 13 inserted in the respective guide holes 8 of the pressing body guide ring 5 are provided.
Are connected to each other by the annular spring 11 and are in the most retracted state.
When the rotary shaft 1 is retracted by projecting from, the pressing body guide ring 5 that is in elastic contact with the end surface of the paper tube P moves toward the front end surface side of the rotary shaft 1 relative to the rotary shaft 1. As a result, each pressing body 13 is gradually retracted, and the clamp of the paper tube P is released.

[Effect of device]

Since the paper tube chuck according to the present invention is configured such that the paper tube is clamped over the entire circumference of the inner peripheral surface of the paper tube while the paper tube is centered, the paper tube is clamped without impairing the roundness. In addition, since the taper surface is used to generate the clamping force, a wedge action occurs and a large clamping force can be generated. In this way, the paper tube can be clamped with a large clamping force without impairing the roundness of the paper tube, so the winding tension of the sheet during one rotation is almost constant, and the sheet can be wound into a beautiful winding shape. You can

[Brief description of drawings]

FIG. 1 is an exploded perspective view of each component constituting the paper tube chuck according to the present invention, FIG. 2 is a sectional view of a part of the rotary shaft 1 in an unclamped state, and FIG. 3 is FIG. III-
A sectional view taken along line III, FIG. 4 is a sectional view of a portion of the rotary shaft 1 in a clamped state, and FIG. 5 is a sectional view taken along line VV of FIG. The description of the reference numerals of the main parts constituting the present invention is as follows. P: Paper tube, 1: Rotating shaft 2: Tapered groove 3: Stopper plate (stopper part) 5: Push body guide ring, 6: Push body guide ring body 7: Push body guide ring flange, 8: Guide hole 11: annular spring (annular elastic body) 13: pressing body, 14: leg of pressing body 15: pressing surface, 16: pressing portion of pressing body 17: taper surface provided on leg of pressing body 19: return spring (Biasing means) 23: Stopper plate (Stopper part)

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft having a plurality of taper grooves axially provided at its tip end; and a pressing portion having an arcuate pressing surface pressed against the inner peripheral surface of the paper tube integrally with the leg portion. A plurality of pressing bodies which are provided and have a tapered surface corresponding to the taper groove of the rotary shaft formed on the lower surface of the leg portion; one end of an annular main body elastically contacts the end surface of the paper tube A pressing body guide ring provided with a collar portion and a plurality of guide holes radially provided in the main body, into which the legs of the pressing body are inserted; both of the taper groove of the rotary shaft Both stroke ends are regulated by stopper portions provided at the forming ends, and the pressing body guide ring slidably fitted in the portion of the rotary shaft where the taper groove is provided is attached to the tip surface of the rotary shaft. Biasing means for biasing to the side; A leg portion is inserted into each guide hole of the pressing body guide ring, and the lower end portion of the leg portion is hooked on the outer periphery of each pressing body fitted in the taper groove of the rotating shaft, And an annular elastic body for connecting the pressing bodies to each other so as to keep them in the most retracted state, and by advancing the rotating shaft, the collar portion of the pressing body guide ring is elastically contacted with the end surface of the paper tube. , The respective pressing bodies are projected, the pressing surface is pressed against the inner peripheral surface of the paper tube to clamp the paper tube, and the pressing bodies are retracted and the clamp is released by retracting the rotary shaft. A paper tube chuck that is mounted on a sheet winder.