JPH052515Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper tube holding device, and more specifically, it is used when winding sheet-like materials such as paper, plastic, aluminum foil, copper foil, etc. onto a paper tube, Suitable for use in a mechanical lock type paper tube holding device that is inserted into the end of the paper tube and held by a holding claw when unwinding the sheet-like material wound around the tube. It is something.

[Prior Art] As is well known, in the feeding and winding processes of printing machines, paper making machines, plastic machines, slitters, etc., sheets of paper, plastic, aluminum foil, copper foil, etc. are wound around paper tubes. Or, the sheet material wound around the paper tube is rewound.

In this way, when winding up a sheet-like body around a paper tube or unwinding a sheet-like body wound around a paper tube, it is necessary to firmly hold the paper tube while allowing it to rotate freely. A paper tube holding device is used for this purpose.

The paper tube holding device is inserted into each of both ends of the paper tube so as to be able to hold the paper tube. Therefore, one of the features of the prior art of this type of paper tube holding device is a tapered cone shape 1', as shown in FIG. This is the both ends 3' and 4' of the paper tube 2'.
A tapered cone 5' is inserted inside each so that its tapered surface portion 6' presses the end 7' of the paper tube outward.

According to the above-mentioned prior art, since the paper tube holding device is formed in a tapered cone shape when it is inserted into both ends of the paper tube, there are several problems to be solved in the following points. That is, when the inner circumferential surface of each end of the paper tube is pressed, only a portion around the tapered cone 5' and the end of the inner circumferential surface of the paper tube are in linear contact. Therefore, there was a problem in that it was difficult to obtain a high pressing force and the paper tube could not be firmly held.

By the way, in recent years in the industry, as typified by ultra-thin films, extremely severe tension control and high torque are required.
In addition, high-mix, small-lot production and maintaining high quality are absolutely necessary conditions. Therefore, if the paper tube is not held firmly, there will be problems such as slipping or deformation of the paper tube during high torque or sudden braking.

Therefore, a technique capable of preventing such inconveniences has been proposed in Japanese Patent Laid-Open No. 155362/1983. The "wound cylindrical body tightening head" proposed in the above publication has a plurality of external wedge pieces for flatly contacting and pressing the inner peripheral surface and end surface of the cylindrical body. By sliding the outer wedge piece on the slope surface formed on the inner wedge piece, the inner circumferential surface of the cylindrical body moves forward in a radial direction, that is, in a radial direction when viewed from the shaft center. and is configured to press and hold the end face.

Therefore, the wound cylinder body tightening head described above can hold the cylinder body even with a large contact area, and prevents the cylinder body from slipping or collapsing during high torque or sudden braking. can be prevented.

[Problems to be solved by the invention] However, when the external wedge piece is configured to slide in this way, the external wedge piece is formed separately from the main body, so that it cannot be removed from the cylindrical body. It is necessary to increase the resistance force against the applied radial force. Therefore, in order to obtain a large resistance force in the radial direction, the wound cylindrical body tightening head has the circumferential surface of the internal wedge piece formed into a polygonal shape, and the inner surface of the external wedge piece formed around the circumference of the internal wedge piece. It is formed into a polygonal shape corresponding to the surface shape. As a result, even if a radial force is applied from the cylindrical body side, the internal wedge piece and the external wedge piece do not slip, and the cylindrical body can be firmly held. However, processing the inclined surface into a polygonal shape in this way is extremely troublesome, requires a lot of effort and technology, and has the problem of significantly lowering manufacturing efficiency.

In view of the above-mentioned problems, it is an object of the present invention to provide a paper tube holder that can increase the area of contact with the inner circumferential surface of the paper tube and is easy to manufacture.

[Means for solving the problems] The present invention has the following technical means to achieve the above object. That is, to explain using the reference numerals used in the attached drawings corresponding to the embodiments, when winding a sheet-like material such as paper, plastic, aluminum film, copper film, etc. onto a paper tube, or In a paper tube holding device for holding the paper tube by being inserted into the end of the paper tube and pressing the inner surface of the end when unwinding a sheet-like object such as: Attachment means 10 A recess 11 is formed in the rear end surface 9 for inserting the
A slide guide groove 1 is provided along the axial direction on the circumferential surface of the
8 are formed in plural numbers at predetermined intervals; a holding claw 6 is slidably disposed in the slide guide groove 18; and the holding claw 6 is attached to the lock body 4. It includes a compression spring 7 that biases toward the tip, and a stopper body 5 that the holding claw 6 comes into contact with when the holding claw 6 is pressed by the compression spring 7 and advances to the tip of the lock body 4. The slide guide groove 18 has a substantially T-shaped cross section, and its bottom is formed as a slope core surface 15 that slopes away from the shaft center as it goes from the tip to the base. In addition, walls 16 and 17 are formed on both sides to act as stoppers for allowing the lock body 4 to slide in the axial direction while restricting rotation in the periaxial direction, and the retaining claws 6, the slope core surface 1
5, and a surface located on the opposite side of the slide surface for pressing the inner circumferential surface 38 of the paper tube 2.
A contact surface 30 provided parallel to the axial direction of the paper tube 2; This paper tube holding device is characterized in that an end portion 31 that abuts the end surface 3 is formed.

[Function] Since the present invention comprises the above-mentioned technical means, the paper tube holding device 1 is inserted into each end portion 3 of the paper tube 2 for use. At this time, the device 1 is larger than the inner diameter of the paper tube 2.
Since it is smaller, the above-mentioned insertion and attachment can be easily performed.

Next, as the paper tube 2 is pressed from both ends 3, the holding claws 6 attached to the lock body 4 of the device 1 slide on the slope core surface 15 formed on the lock body 4. , the contact surface 30 formed on the upper surface of the slide guide groove 1
Advance towards the outside of 8. As a result, the contact surface 3 is attached to the inner circumferential surface 38 of both ends 3 of the paper tube 2.
0 makes firm contact. In addition, in this abutting state, the end 31 of the holding claw 6 and the end surface 3 of the paper tube 2 strongly abut, so a large abutting area is obtained as a whole, and these large abutting parts The paper tube 2 is firmly held.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, reference numeral 1 indicates the entire paper tube holding device, and when winding up a sheet-like material such as paper, plastic, aluminum foil, or copper foil, or when unwinding a sheet-like material wound around the paper tube 2, the paper tube holding device 1 is used to hold the paper tube. It is used to be inserted into both ends 3 of the tube 2 and held from the inside.

To explain this in detail, this paper tube holding device 1 is roughly composed of a lock body 4, a stopper body 5, a plurality of holding claws 6, and a compression spring 7.

As shown in FIGS. 4 to 6, the lock main body 4 has a substantially cylindrical overall shape, and a cylindrical flange is formed at one end 8. As shown in FIGS. Also formed in the end face 9 is a recess 11 for inserting attachment means 10 for attachment to the device or to the drive cylinder piston.

Furthermore, slide guide grooves 18 are formed around the periphery 13 of the front portion 12 at predetermined angle intervals along the circumferential direction. For example, five slide guide grooves 18 are formed at intervals of 72 degrees. A slope core surface 15 is formed on the bottom surface of the slide guide groove 18. The slope core surface 15 is an inclined surface that approaches the center of the shaft as it approaches the front end 14.

Both sides of the slide guide groove 18 are walls 16,
17 is formed, and its cross-sectional shape is T-shaped.

Further, a hole of a predetermined size is formed in one end side 8 of this slide core surface 15.

Further, in the center portion 19 of the lock body 4, there is a bolt hole 2 for fixing the above-described attachment means 10.
0 is formed.

Next, as shown in FIGS. 9 and 10, a stopper body 5 is formed in a cylindrical shape to be inserted into the front end 14 of the lock body 4. The above-mentioned bolt hole 20 is formed in this central part 21, and a recess 2 formed in the front surface 22 of the lock body 4 is formed in the center part 21.
3, a convex portion 25 is provided on the back surface 24 of the stopper body 5 at a position corresponding to the concave portion 23.
is formed.

In addition, in order to fix this stopper body 5,
Between the adjacent slope core surfaces 15 of the lock body 4, that is, with respect to this slope core surface 15.
Bolt holes 26 each at positions shifted by 36 degrees to the left and right
The lock body 4 and the stopper body 5 are integrally screwed together with a bolt 27.

In this example, it is screwed by five bolts 27. Furthermore, the bolt 27 is designed not to protrude beyond the surface 28 of the stopper body.

Next, the holding claw 6 will be explained with reference to FIGS. 7, 8, and 12. This holding claw 6
As mentioned above, there are 5
The slope core surface 15 formed at the T
They are respectively fitted into slide guide grooves 18 formed in a mold shape.

The overall shape of the holding claw 6 is formed into a plate shape, and a planar contact surface 30 is formed on one side 29. Further, the end portion 31 of the holding claw 6 is raised perpendicularly to the contact surface 30.
Further, an insertion groove 34 for inserting the guide body 33 is formed on the other side 32, and two bolt holes 35 for inserting and screwing the guide body 33 into this insertion groove 34. formed in places. Further, a notch portion 37 is formed in the front end portion 36 of this holding claw 6.

By inserting the guide body 33 into the insertion groove 34 and screwing it into the holding claw 6, the guide body 33 is engaged with the T-shaped slide guide groove 18 of the slope core surface 15 of the lock body 4. I have to.

Furthermore, by pressing both ends 3 of the paper tube 2 in this engaged state, the holding claws 6 are pressed against the slope core surface 15 and both wall surfaces 16, 17 of the T-shaped slide guide groove 18. It slides while being guided and presses the inner circumferential surface 38 of the end 3 of the paper tube 2 with the contact surface 30 .

Therefore, the planar contact surface 30 of the holding claw 6
The paper tube 2 is pressed and held by the end portions 31 and 31. At this time, a spring support member 3 is attached to the cylindrical flange formed on the one end 8 side of the lock body 4 and the end 31 of the retaining claw 6.
A compression spring 7 is inserted between the springs 9 and 9.

Further, in this example, a recess 11 formed in the end surface 9 on the one end 8 side of the lock body 4 has a first
A key-fixing type attachment means 10 as shown in FIGS. 3 and 14 is used.

Note that a flange type attachment means 10 can be used other than the key fixed type.

Furthermore, although this embodiment shows an example in which the holding claws 6 are provided at five locations, the number may be increased.

For example, slide guide grooves 18 are formed at eight locations, that is, at intervals of 45 degrees, and these slide guide grooves 1
A holding claw 6 may be provided on each of the holding claws 8.

Next, an example of use of this embodiment will be explained based on the above configuration.

When winding up a sheet material such as paper, plastic, aluminum foil, copper foil, etc. onto the paper tube 2, or when unwinding the sheet material wound around the paper tube 2, paper is applied to both ends 3 of the paper tube 2, respectively. Insert the tube holding device 1. At this time, the device 1 is larger than the inner diameter of the paper tube 2.
Since it is smaller, it can be easily inserted and installed, improving work efficiency.

Next, when both ends 3 of this paper tube 1 are pressed, the end 31 provided on the holding claw 6 attached to the lock body 4 of the device 1 comes into contact with the end surface of the paper tube, and in this state, When pressed, the planar contact surface 30 provided on the holding claw 6 contacts the slope core surface 1 formed on the lock body 4.
Slide over 5. As a result, the plurality of holding claws 6 move rearward and protrude in the radial direction. Therefore, it is firmly abutted against the inner circumferential surface 38 of both ends 3 of the paper tube 2.

In addition, in this abutting state, the end 31 of the holding claw 6 and both ends 3 of the paper tube 2 are firmly abutted, so that a large contact area is obtained as a whole, and the paper tube 2 Be able to hold it firmly.

Since the paper tube holder of this embodiment holds the paper tube 2 in this manner, it is easy to insert the paper tube 2 into both ends 3 of the paper tube 2, and when pressed, the plurality of holders have a planar contact surface 30. The claws 6 can firmly hold the inner peripheral surfaces 38 of both ends 3 of the paper tube 2. Therefore, in recent years, in the converting industry, as typified by ultra-thin films, metal foils, vacuum-deposited films, and magnetic tapes, extremely severe tension control and high torque are required, and high-mix, small-lot, High-quality protection is required, resulting in high torque and the ability to prevent slippage during sudden braking.

In addition, in order to improve the sliding characteristics on the sliding surface such as the slope core 15 on which the holding claw 6 slides, the sliding surface or the entire device may be subjected to a secondary treatment to improve the slipperiness. good.

[Effects of the invention] As detailed above, the invention makes it possible to increase the contact area between the inner circumferential surface 38 of each end 3 of the paper tube 2 and the holding device by bringing them into planar contact. I can do it. This makes it possible to firmly hold the paper tube 2 and the holding device without slipping even during high torque or sudden braking, and both the slope core surface and the holding claw surface form only a flat inclined surface. It has various advantages, such as being able to obtain a large resistance force in the radial direction and improving the manufacturing efficiency of paper tube holding devices with a large contact area and a large holding force. .

[Brief explanation of the drawing]

The attached drawings, FIGS. 1 to 14, show an embodiment of the present invention, in which FIG. 1 is a side view including a partial cross section showing the inserted state, and FIG. 2 is a partial cross section of the paper tube holding device. 3 is a front view seen from the direction indicated by arrow P in FIG. 2, FIG. 4 is a front view of the front part of the lock body, and FIG. 5 is a view shown in FIG. FIG. 6 is a cross-sectional view taken along line XX shown in FIG. 5, and FIG. 7 is a cross-sectional view taken along line Y-Y shown in FIG.
FIG. 8 is a front view of the holding claw as viewed from the direction indicated by arrow Q in FIG. 7, FIG. 9 is a front view of the stopper body, and FIG. Longitudinal side view along the Z-Z line shown, 1st
Fig. 1 is a side view including a partial cross section to show the operation, Fig. 12 is a front view showing a state in which the holding claw is inserted, Fig. 13 is a sectional view showing the attachment means, and Fig. 14. 13 shows a front view indicated by arrow R in FIG. 13, and FIG. 15 shows a sectional view showing the prior art. In addition, in the figure, 1...paper tube holding device, 2...paper tube, 3...end, 4...lock body, 5...stopper body, 6...holding claw, 7...compression spring, 8 ...One end, 10... Attachment means, 12...
Front part, 13... Surroundings, 14... Front end, 15...
... Slope core, 16, 17 ... Wall, 18 ... Slide guide groove, 30 ... Contact surface, 31 ... End of holding claw, 38 ... Inner peripheral surface, respectively.

Claims (1)

[Scope of claim for utility model registration] When winding a sheet-like material such as paper, plastic, aluminum foil, copper foil, etc. into a paper tube, or when unwinding the above-mentioned sheet-like material wound around a paper tube, In the paper tube holding device that is inserted into the end of the paper tube and holds the paper tube by pressing the inner surface of the end; 9 and the front portion 12
A slide guide groove 1 is provided along the axial direction on the circumferential surface of the
8 are formed in plural numbers at predetermined intervals; a holding claw 6 is slidably disposed in the slide guide groove 18; and the holding claw 6 is attached to the lock body 4. It includes a compression spring 7 that biases toward the tip, and a stopper body 5 with which the holding claw 6 comes into contact when the holding claw 6 is pressed by the compression spring 7 and advances to the tip of the lock body 4. The slide guide groove 18 has a substantially T-shaped cross section, and its bottom is formed as a slope core surface 15 that slopes away from the shaft center as it goes from the tip to the base. At the same time, walls 16 and 17 are formed on both sides to act as stoppers for allowing the lock main body 4 to slide in the axial direction while restricting rotation in the periaxial direction. 6, the slope core surface 1
5, and a surface located on the opposite side of the slide surface for pressing the inner circumferential surface 38 of the paper tube 2.
A contact surface 30 is provided to be parallel to the axial direction of the paper tube 2, and a contact surface 30 is raised at right angles from the contact surface 30, and when the paper tube 2 is held, the paper tube 2 is A paper tube holding device characterized in that an end portion 31 that abuts the end surface 3 is formed.