JPH0442305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a winding shaft for paper, cellophane, resin film, etc. (hereinafter referred to as film).

(Prior Art) Conventionally, in a film winding shaft, a plate spring pawl 7 is generally used as a means for fixing a paper tube inserted into the shaft, and the typical shape thereof is as follows. As shown in Figures 4 to 6 of the attached drawings of Utility Model Application No. 54-130181, the tips of these claws are wide. When this is used on the film winding shaft of a uniaxial slitter, the film inevitably has uneven thickness (uneven thickness), and even if this uneven thickness is extremely small,
During the winding process, the diameter of the thicker part naturally becomes larger than that of the thinner part, which increases the tension, and eventually the paper tube may collapse and become unable to be removed from the shaft.
Although many sliding devices have been provided in the past, a single-axis system as shown in FIG. 4 cannot be used because the claws span two paper tubes due to the structure. Next, the air shaft method was devised, with a hollow pipe as the axis.
A large number of elongated holes are provided in the shaft, and a long lug on the upper surface is projected from inside the shaft by air pressure, and the upper surface of the lug presses the inner surface of the paper tube to hold the paper tube. Even with this method, the lug may span two paper tubes, so it cannot be used with a single shaft method.

(Problems to be Solved by the Invention) The claws 7 of the conventional sliding device bite into the paper tube and generate paper waste, and since the tip of the claw 7 has a width, the tip of one claw 7 As shown by the dotted circle in Figure 4, no slipping occurs when the paper tube straddles two adjacent paper tubes. Therefore, it is not used for single-shaft winding shafts, but only for two-shaft winding shafts. The winding tension is controlled by pressure from the sides, so when the tension increases, pressure only acts on the paper tube on the side, making it difficult to apply pressure to the paper tube inside, making smooth tension control impossible. In this case, not only will the film not be wound evenly, but in extreme cases, the paper tube will break and winding will not be possible, and the paper tube will not be able to be removed from the shaft. Of course, it would be possible to adjust the position of the tip according to the width of the paper tube, but this would complicate the structure of the device, increase the cost of the device, and take a long time to adjust before winding. However, it has not actually been implemented. In order to avoid this drawback of the conventional method, a method has been adopted in which multiple shafts are used to alternately wind the slit narrow film. However, in this multi-shaft type, the rewinding position is higher than the slitting position of the film. Because of the long distance between the slits and the narrow width of the film, it swings laterally, so in order to wind the cut edges evenly, you need to use brim-like pads on both sides of the paper tube, or separate each paper tube into a slit. It is necessary to attach a presser roll, which complicates the structure of the device and increases the cost of the device. This invention improves the above-mentioned drawbacks of conventional film winding shafts, and when used in a single-shaft type, one sliding device does not straddle and abut two paper tubes, and can always be used. It is an object of the present invention to provide a paper tube winding shaft equipped with a sliding device that contacts the paper tube at one point and has a sliding function, has a simple structure, is inexpensive, and does not require troublesome work for attaching and detaching the paper tube. .

(Means for solving the problem) A winding shaft for film, etc. is inserted into each hole of a pipe having a large number of holes, which is a rotating shaft, and the tip thereof has a hemispherical shape, and is biased inward by a spring. A sliding device having a slider is attached, and the air inside the pipe is pressed against the slider, and the hemispherical tip of the slider protruding outside the pipe touches the inner surface of the paper tube fitted into the pipe. The paper tube is supported by pressure, and when the tension becomes large on the paper tube where a narrow film with thick uneven thickness is wound up, the hemispherical tip of the slider moves against the inner surface of the paper tube by eliminating frictional resistance. This allows the rotation to slow down so that the sliding circumferential speeds are equal.

(Function) The spring of the sliding device biases the slider inward of the pipe so that the tip of the slider does not protrude beyond the surface of the pipe, which is the rotation axis, and makes it easier to insert the paper tube into the pipe, thereby preventing the slider from sliding. The child is pushed by compressed air injected into the pipe and slides against the spring, causing its hemispherical tip to protrude outward from the pipe surface.

The hemispherical tip of the protruding slider pushes and supports the paper tube at one point.

As the pipe, which is the rotating shaft, rotates, the paper tube winds the film due to frictional resistance. When the tension of the film increases due to the uneven thickness of the film, the hemispherical tip of the slider pushing the paper tube slips against the frictional resistance, slowing down the paper in the paper tube, and the tension of the film decreases to the specified tension. When it returns to , the film is wound at the original constant speed. Meanwhile, the other paper tubes are rotating at a constant speed. In this way, the film wound onto each paper tube is wound at the same speed. The air in the tube exerts a constant pressure on the tube, and therefore applies an average pressure on the slider of each sliding device installed on the pipe, which is the axis of rotation.

(Example) The embodiments shown in the drawings will be described below.

Reference numeral 1 denotes an outer pipe, in which a large number of screw holes 11 are bored. The screw holes 11 are preferably provided in a staggered manner.

Reference numeral 2 denotes a sliding device which also serves as a support means for the paper tube. The sliding device 2 is attached to the screw hole 1 of the outer pipe 1.
1, a slider 22 that slides inside the tube 21, and a spiral push spring 23. The slider 22 has a spherical recess at the tip of a cylindrical portion 22a. A steel ball 22b is adhered or welded to the recess, and an enlarged head 22c is provided at the other end. The push spring 23 may have another structure. The enlarged head 22c is large enough to pass through the screw hole 11. Instead of fixing the steel ball 22b to the tip of the slider 22, the slider 22 may be formed by grinding the tip of a steel cylinder and hardening it into a hemispherical shape. The push spring 23 winds around the cylindrical portion 22a, has one end locked to the lower end of the cylinder 21 (in the figure), and the other end to the enlarged head 22c, urging the slider downward (in the figure) to force the steel ball 22b The whole tube is 21
Immerse yourself inside.

The sliding device 2 is not limited to the structure described above, but may have another structure that maintains the airtightness of the outer pipe 1. For example, the hole in the outer pipe 1 may not be a screw hole, the tube 21 may be omitted, and the cylindrical portion 2 of the slider 22 may be
Slider 22 with a groove provided in 2a and an O-ring attached
Attach it to the hole of outer pipe 1. In this case, tube 4 is not required.

Inside the outer pipe 1, there is built-in a metal inner pipe 3 with a large number of ventilation holes, and an intermediate pipe 5 that covers the outside of a rubber tube 4 that covers the inner pipe 3.
The outer pipe 1, the inner pipe 3, and the intermediate pipe 5 are connected by a collar (not shown) to form a rotating shaft.

A hole 51 is provided in the intermediate pipe 5 at a position corresponding to the expanded head 22c of the sliding device 2 installed on the outer pipe 1.

The inner pipe 3 is connected to an air cylinder (not shown) to allow the injection of compressed air and the evacuation of air in a known manner.

When using this winding shaft in a slitter, insert the outer pipe, which is the rotating shaft, into a plurality of connected paper tubes 6, attach the paper tube 6 to the outer pipe, and inject compressed air into the inner pipe 3. , air enters the tube 4 through the ventilation hole and inflates the tube 4, but since the intermediate pipe 5 is present at this time, the tube expands outward from the hole 51 and pushes the enlarged head 22c of the sliding device 2. , the slider 22 is slid upward (in the figure) against the push spring 23, and the steel ball 22b protrudes from the cylinder 21 and presses against the paper tube 6, thereby fixing the paper tube 6. When one end of the slit narrow film is secured to each paper tube 6 and the pipe 1 is rotated by an electric motor (not shown), the narrow film is wound up. When film is produced, it is inevitable that uneven thickness will occur, although it may be slight. When a small width film is wound onto the paper tube 6 with a predetermined tension, the tension increases in the paper tube around which the narrow width film of the thick uneven thickness portion is wound, eliminating frictional resistance and causing the paper to roll. The steel ball 22b in contact with the inner surface of the tube 6 slides, and its rotation is slowed down so that the circumferential speed is equalized. steel ball 22b
Since it contacts the inner surface of the paper tube 6 at one point, it does not cross over and contact two adjacent paper tubes.
Even if the steel ball 22b slips on the paper tube 6, the other paper tubes 6, on which the narrow film is wound with a predetermined tension, continue to wind the film at a constant speed. Therefore, the tension of the film in the paper tube 6 whose winding is delayed immediately returns to the predetermined tension, and the film is wound at a constant speed. . In this way, the plurality of paper tubes 6 attached to the pipe 1 are not distorted or broken due to uneven thickness of the film, and both ends of the film are slit uniformly and simultaneously into the plurality of connected paper tubes 6. Align and wind.

Although the intermediate pipe 5 provided with the hole 51 can be omitted, it is preferable to attach the pipe 5 because the tube 4 expanded with air can reliably and equally press the expanded head 22c of the slider 22.

The pressure of the air injected into the tube 4 may be lower than that of the side pressurized air in the winding tension control method described in the prior art section so that the tip of the slider 22 slides smoothly. good.

The winding shaft for film, etc. according to the present invention is not limited to use in a slitter, but can be used for mounting a printing machine and other paper tubes by slightly increasing the air pressure.

(Effects) In the winding shaft for films, etc. according to the present invention, the tip of the slider of the sliding device has a hemispherical shape and contacts the paper tube at one point, so that a plurality of paper tubes can be mounted adjacent to one shaft. Also, two slider tips of one sliding device are adjacent to each other.
Since there is no contact across two paper tubes, the tip of the slider slides against the frictional resistance on paper tubes where the tension of the film is increased due to uneven thickness of the film, delaying the winding of the film and immediately The tension of the film is returned to a predetermined tension, and the film is wound at a constant speed. When a tube is used, it is expanded by air pressure and presses the sliders of any sliding device with equal pressure, so that the sliding device operates reliably. During this time, other paper tubes wind the film without being affected by this. Therefore, even if a large number of paper tubes are installed adjacent to one shaft, each paper tube will not be twisted or broken due to uneven thickness of the film, and the edges of the film will be aligned and wound evenly. It can make the removal of paper tube from smooth and easy. Therefore, if this winding shaft is used, there is no need for a multi-shaft system, and a single shaft is sufficient, and there is no need to put in and take out the paper tube, and the winding device itself has a simple structure and is inexpensive to manufacture. I'm done. Of course, there is no problem in using this winding shaft in a multi-shaft type device.

Since the tip of the slider of the sliding device that comes into contact with the paper tube has a hemispherical shape, even if the tension of the film increases, the tip does not bite into the paper tube, so paper waste is not generated.

[Brief explanation of drawings]

What is shown in the drawings is an embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional end view of the main part of the winding shaft in a state where the tube is not inflated, FIG. 2 is a cross-sectional end view of the main part, and FIG. The figure is a longitudinal sectional end view of the main part of the winding shaft with the tube inflated, and FIG. 4 is a longitudinal sectional end view of the main part of the conventional winding shaft. DESCRIPTION OF SYMBOLS 1...Outer pipe, 11...Threaded hole, 2...Sliding device, 21...Cylinder, 22...Slider, 22a...Cylindrical part, 22b...Steel ball, 22c...Enlarged head, 23... ...Press spring, 3...Inner pipe, 4...
Tube, 5...Middle pipe, 6...Paper tube, 7...
…nail.

Claims (1)

[Claims] 1 A sliding device having a hemispherical tip and a slider biased inwardly into the pipe by a spring is attached to each hole of a pipe having a large number of holes, which is a rotating shaft, The slider is pushed by the pressure of the air inside the pipe, and the hemispherical tip of the slider that protrudes outside the pipe presses the inner surface of the paper tube fitted into the pipe, supporting the paper tube and reducing the narrow width of the thick uneven wall part. When the tension increases in a paper tube around which a film is wound, frictional resistance is eliminated and the hemispherical tip of the slider slides on the inner surface of the paper tube, making it possible to slow down the rotation so that the circumferential speed becomes equal. A winding shaft for film, etc., characterized by: