JPH09136745A - Chuck for roll paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce sliding resistance and to increase the holding force of a chuck by making a gap between the bottom surface of a dovetail groove and a pressure plate and inserting a linear roller bearing into the gap. SOLUTION: When roll paper 9 is mounted, the roll paper is carried and placed at a specified position and a roll paper chuck 10 is inserted into the roll paper 9 from both ends thereof via a roll paper supporting arm 12 and is moved to the center side. The projecting part 3a of a claw 3 is put into contact with metal 15 at the end of a paper pipe 14 and is pressed back to the base end and outward in a radial direction of a shaft 2 along a slanted groove to expand the diameter of a supporting part engaging with the metal 15 of the paper pipe 14 (A part, the outer end of the jaw 3) and to hold the roll paper 9 by the expanding force P1 produced thereby. A linear roller bearing 7 inserted between the claw 3 and the bottom of the groove 8b formed in the shaft 2 greatly reduces friction resistance caused by the movement of the claw 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper roll chuck for holding a paper tube at the center of a roll of paper wound from both ends thereof. This device is widely applied to a supporting device for supporting a roll-shaped sheet by being installed in a rotary printing machine, a corrugating machine, a loom, and the like.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view of a conventional paper roll chuck, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. In the figure, 2
Is a shaft, and includes a shaft portion 2a and a flange portion 2b. Reference numeral 1 is a washer attached to the tip of the shaft portion 2a of the shaft, 3 is a claw attached to the side portion of the shaft portion 2a, 4 is a spring receiver, 5 is a holding plate, and 6 is a compression spring. A roll paper chuck 16 is mainly composed of these parts, and this chuck is provided on the end face of the rotary shaft 13
A plurality of bolts 1 penetrating the flange portion 2b of the shaft
It is installed by 1. The rotary shaft 13 is pivotally supported by a paper roll support arm (not shown).

The shaft portion 2a is formed with a plurality of sloped grooves 8 having a predetermined groove bottom angle θ ₀ so as to be gradually shallowed from the front end toward the flange portion 2b at a plurality of positions on the outer peripheral surface thereof. The gradient groove 8 has a slit-shaped groove 8a and the same groove 8a.
And a dovetail groove 8b having a constant cross section, which is connected to the bottom of the groove and is slightly wider than the groove 8a. The slope of the bottom of the dovetail groove 8b is θ ₀ described above. The holding plate 5 is for preventing the claw 3 from falling off, and is attached to the bottom surface of the claw 3.
With the claw and the holding plate integrated, the claw 3 has a sloped groove 8a.
The pressing plate 5 is inserted into the dovetail groove 8b and can reciprocate along the groove. The projection 3 a of the claw 3 abuts against the base 15 of the paper roll paper tube 14 and is pushed, and moves with respect to the shaft 2. With this movement, the distance of the claw 3 from the center line of the device changes. That is, the outer edges of the plurality of claws 3 (A in FIG. 6)
It has a structure in which the outer diameter formed by can be expanded or reduced.
In the figure, 14 is a paper tube at the center of the paper roll, and 15 is a ferrule at the end of the paper tube. The upper half of FIG. 6 shows the state before the pawl engages with the paper tube, that is, the initial setting state, and the lower half of the figure shows the state where the pawl engages with the paper tube, that is, the web holding state. Shows.

A compression spring 6 is mounted between the spring receiver 4 and the shaft flange portion 2b. The pressing force of the compression spring 6 presses the plurality of claws 3 toward the front end side of the shaft 2 via the spring receiver 4. The washer 1 prevents the claw 3 pushed toward the front end from coming off. A taper is formed at the front end of the washer 1 to facilitate insertion into the paper tube. The web chuck 16 is configured as described above.

In this apparatus, when the paper roll 9 is mounted, first, the paper roll 9 is loaded and placed at a predetermined position.
16 is inserted, and both chucks 16 and 16 are moved to the center side. By the above operation, the claw 3 is pushed back to the base side by the mouthpiece 15 at the end of the paper tube 14 via the protrusion 3a, and is pushed out in the diametrical direction of the shaft 2 along the sloped groove 8, so that the support portion inscribed in the mouthpiece 15 is inscribed. The diameter of (the portion A in FIG. 6 and the outer edge of the claw 3) is increased, and the pushing and expanding force P ₂ generated by this
Therefore, the roll paper 9 is supported. Also, roll paper 9
When releasing from the chuck 16, the reverse operation to the above may be performed. In other words, when the web 9 is transferred to the predetermined position and then the chuck is moved in both directions via the web supporting arm, the pawl 3 is pushed out to the front end side of the shaft 2 by the pressing force of the compression spring 6 as it is pulled out from the paper tube 14. And the engaging portion of the claw 3 with the mouthpiece 15 of the paper tube 14 (A portion in FIG. 6)
The diameter of is reduced. As a result, a gap δ is formed in the engaging portion, which enables extraction.

FIG. 7 is a functional comparison diagram of the present invention, which will be described later, and the above-mentioned conventional technique, and FIG. 7B is a functional explanatory diagram of the above-mentioned conventional paper-feed chuck. The conventional paper roll chuck 16 is configured and functions as described above. Due to its structure, a large sliding (friction) occurs between the holding plate 5 of the claw portion and the bottom of the dovetail groove 8b formed on the shaft 2 as shown in the figure. The resistance f ₀ is generated, which causes a problem that the sliding surface is seized and the claw 3 does not move. In addition, in relation to the above, since the frictional resistance f ₀ becomes high, the gradient θ ₀ of the gradient groove 8 cannot be increased, and a predetermined tightening force (pushing force for the paper tube) P
₂ to obtain the amount of expansion and contraction, the groove 8 of the shaft 2, namely the shaft 2a
It was necessary to lengthen the length L _{0 of the} part.

[0007]

SUMMARY OF THE INVENTION The conventional paper roll chuck is provided with pawls that slide in the axial direction along inclined grooves formed at a plurality of locations on the outer peripheral surface of a shaft. After inserting the chuck, the claw portion is retracted by further approaching it, the outer edge portion of the claw is moved in the diametrical direction, and the paper roll is held by the action force of pushing the paper tube from the inside. In order to obtain the paper tube supporting force based on the above structure, it is necessary to set the holding force of both chucks to be strong.
At this time, a large sliding (friction) resistance is generated between the inclined groove of the shaft and the engaging portion of the claw. Therefore, if an attempt is made to increase the holding force of the chuck, the sliding surface of the claw will be seized and smooth movement cannot be achieved. If the groove gradient is reduced as a means for reducing the sliding resistance of the claw, the shaft shaft portion must be made long in order to obtain a predetermined paper tube tightening force (pushing force) and expansion / contraction amount. On the other hand, when the length of the gradient groove is not changed and only the gradient angle is reduced, the amount of expansion / contraction of the claw portion is reduced and the versatility of adapting to paper tubes of various diameters is reduced.

The present invention solves the above-mentioned drawbacks of the prior art and reduces the sliding resistance to strengthen the holding force of the chuck.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and comprises a slit-shaped groove and a dovetail groove having a constant cross section continuous with the slit-shaped groove on the outer peripheral surface of a shaft pivotally supported by a supporting arm of a paper roll. Sliding into the gradient groove with a plurality of gradient grooves formed so that the groove bottom gradually becomes shallower from the front end of the shaft toward the base, and a holding plate slidably inserted in the dovetail groove. A paper roll having a plurality of claws attached to the paper roll, and when the shaft is inserted into the paper core of the paper roll, the above-mentioned pawl moves along the sloped groove and is pushed outward to engage the paper pipe to hold the paper roll. In the chuck, there is provided a gap between the bottom surface of the dovetail groove and the holding plate, and a linear type roller bearing is incorporated in the gap to reduce the sliding resistance of the claw, and to a paper roll chuck. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of a paper web chuck according to an embodiment of the present invention, FIG. 2 is a II-II sectional view of FIG. 1, FIG. 3 is a III-III sectional view of FIG. FIG. 4 is a two-sided view of a linear roller bearing used in the above-mentioned device, (a) is a plan view and (b) is a sectional view.

This device is mainly composed of a washer 1, a shaft 2, a claw 3, a spring receiver 4, a holding plate 5, a compression spring 6, a linear roller bearing 7, and the like. By reciprocally moving the claw 3 in the axial direction along the gradient groove 8 formed on the outer peripheral surface of the shaft 2, and contracting the outer edges of the plurality of claws, that is, the diameter of the circle formed by the engaging portion with the paper tube, The basic function of the paper roll chuck for attaching and detaching the paper roll 9 is the same as that described in the section of the above-mentioned prior art, and a pair is installed at both width ends of the paper roll 9 to be carried in and brought into contact with and separated from each other. The point that works by is the same.

The shaft 2 is fixed to a rotary shaft 13 which is pivotally supported by a paper support arm 12 through a plurality of bolts 11 which are composed of a shaft 2a portion and a flange 2b portion and are inserted into holes of the flange 2b portion. The shaft 2a of the shaft has a predetermined gradient θ so that it gradually becomes shallower from the front end toward the base (flange) 2b at three points (generally, three or more points) equally divided to the outer peripheral surface of the shaft 2a. A gradient groove 8 is formed. The gradient groove 8 is composed of a slit-shaped groove 8a and a dovetail groove 8b of a constant cross section which is continuous with the bottom portion of the groove 8a and is slightly wider than the groove 8a. The slope of the bottom of the dovetail is the above θ. The claw 3 is a holding plate 5 fixed to the bottom.
Together with the grooves 8a and 8 formed on the shaft 2a of the shaft.
It fits into part b and moves back and forth along the groove. When the protrusion 3a of the claw 3 comes into contact with the mouthpiece 15 of the paper tube 14 of the paper roll 9 and the jaw 3 moves with respect to the shaft 2, the diameter of A in the drawing which engages with the inner diameter portion of the mouthpiece 15 can be enlarged or reduced. It is like this.
The pressing plate 5 functions to prevent the claws 3 from falling out in the radial direction of the shaft 2 by fitting in the dovetail groove 8b of the shaft 2.

In FIG. 2, reference numeral 4 denotes a spring receiver, which holds a compression spring 6 interposed between the flange 2b of the shaft 2 and a plurality of pawls engaged by the pressing force of the compression spring 6. 3 is pushed out in synchronization with the front end of the shaft 2. Further, reference numeral 1 in FIG. 2 is a washer to form a taper at the front end to facilitate insertion into the mouthpiece 15 portion fixed to the paper tube 14 and the claw 3 pushed out through the compression spring 6 to the tip of the shaft 2. It prevents it from falling to the side. The above functions are the same as in the conventional technique.

The present invention is different from the conventional one in that in FIG.
The point is that a sufficient gap is formed at the position indicated by S, that is, between the holding plate 5 and the dovetail groove 8b, and the linear type roller bearing 7 shown in FIG. 4 is incorporated therein. The linear roller bearing 7 functions to reduce the running resistance associated with the linear movement by the rotation of the roller. As shown in FIG. 4, the cage 7b holds the rollers 7a at a small pitch to increase a large rated load and a high load. It has rigidity, and has a structural feature that the sectional height (thickness) t can be suppressed small. The web chuck 10 of this embodiment is configured as described above.

Based on the above structure, the function will be described below. The upper side of the center line in FIG. 2 shows the initial setting state, and the lower side shows the rolled paper support state. When mounting the paper roll 9, first, the paper roll chucks 10 and 10 are inserted into the paper roll 9 carried into the predetermined position from both width ends via the paper roll support arms 12. Subsequently, the chucks 10 and 10 are further moved to the center side of the paper roll. By the above-described operation, the projection 3a of the claw 3 is pushed back toward the base by contacting the base 15 at the end of the paper tube 14 and is pushed outward in the radial direction of the shaft 2 along the gradient groove. The diameter of the support portion (the portion A in the figure, the outer edge of the claw 3) that engages with the ferrule 15 of the tube 14 increases, and the paper 9 is held by the pushing force P ₁ generated thereby.
Further, in order to release the paper roll 9 from the chuck 10, the reverse operation to the above may be performed. As the claw 3 is pulled out from the paper tube 14, it is pushed out to the front end side of the shaft 2 by the pressing force of the compression spring 6 and the paper roll Base 1 fixed to tube 14
The diameter of the engaging portion (A portion in the figure) with 5 is reduced, and a gap is formed in the same portion, so that extraction is possible.

Since the paper web chuck 10 of the present invention functions as described above, as shown in FIG. 7 (a), the linear roller bearing 7 installed in the middle of the claw 3 and the bottom of the groove 8b formed in the shaft 2 is assembled. The frictional resistance f associated with the movement of the claw 3 can be greatly reduced by the action of (1), and troubles such as seizure of the sliding surface, which has been a problem in the past, are eliminated. Further, since the claw 3 can be smoothly moved by the same function and the inclination angle θ of the groove 8 formed on the shaft 2 can be increased, when the same tightening force (pushing force for the paper tube) P ₁ and expansion / contraction amount are obtained,
It becomes possible to shorten the length of the shaft 2a portion.

The paper roll chuck of the present invention may be replaced by another linear bearing having the same function in place of the illustrated linear type roller bearing 7. Further, it can be applied to a supporting device for roll-shaped sheets such as woven cloth other than the paper roll.

[0018]

In the paper roll chuck of the present invention, a gap is provided between the bottom surface of the dovetail groove and the holding plate, and a linear roller bearing is incorporated in the gap. (1) Gradient groove formed on the shaft The frictional resistance of the claws that move along is small, and there is no fear that the sliding surface will seize. (2) Since the gradient angle can be increased in relation to the first term, when the same tightening force and expansion / contraction amount are obtained, the length of the groove, that is, the length of the shaft can be shortened. (3) In relation to the above item (1), the movement state (movement distance, frictional resistance) of the plurality of claws that move along the sloped groove does not change, and the center of the paper roll tube center with respect to the paper roll chuck is eliminated. Can be accurately matched, and the vibration when feeding the paper can be reduced. (4) The work time for maintenance, inspection, repair, etc. can be shortened. And so on.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a paper web chuck according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a two-sided view of a linear roller bearing used in the apparatus of the above embodiment, (a) is a plan view,
(B) is sectional drawing.

FIG. 5 is a cross-sectional view of a conventional paper roll chuck.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a functional comparison diagram of the present invention and the prior art,
(A) is a figure in the case of the present invention, and (b) is a figure showing the case of a prior art.

[Explanation of symbols]

1 Washer 2 Shaft 2a Shaft Part 2b Flange Part 3 Claw 4 Spring Receiver 5 Presser Plate 6 Compression Spring 7 Linear Type Roller Bearing 8 Gradient Groove 8a Groove 8b Dovetail Groove 9 (Roll Sheet) 10 Rolling Paper Chuck (Invention) 11 Bolt 12 winding paper arm 13 rotary shaft 14 paper tube 15 cap 16 winding paper chuck (conventional) P ₁ , P ₂ paper tube clamping force R direct pressure θ ₀ , θ groove inclination angle L ₀ , L shaft groove length f ₀ , f Friction resistance μ ₀ , μ Friction coefficient

Claims (1)

[Claims] 1. An outer peripheral surface of a shaft pivotally supported by a support arm for a paper roll, which is formed by a slit-shaped groove and a dovetail groove having a constant cross section that is continuous with the slit-shaped groove so that the groove bottom gradually becomes shallower from the front end of the shaft toward the base. A plurality of sloped grooves and a plurality of claws slidably mounted in the sloped grooves having a holding plate slidably inserted in the dovetail groove, When the shaft is inserted, the claw moves along the sloped groove and is pushed outward to engage the paper tube to hold the paper roll.In the paper roll chuck, there is a gap between the bottom surface of the dovetail groove and the holding plate. The paper roll chuck is characterized in that a linear roller bearing is installed in the gap to reduce the sliding resistance of the claw.