JP2554841B2 - Pneumatic core clamp shaft - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core of a paper tube or the like when winding a film (work) such as paper, plastic foil, aluminum foil or copper foil around a core tube of a cylindrical paper tube or the like. The present invention relates to a pneumatic core clamp shaft used when rewinding a work wound on a pipe.

[0002]

2. Description of the Related Art A conventional core clamp shaft utilizing air pressure is shown in FIG. 14 showing a left end portion of a longitudinal side surface and FIG. 15 showing a partially enlarged view of FIG.
As described below (hereinafter referred to as 253), the hollow expansion ring 17 and the spacer ring 18 are alternately fitted to the hollow shaft 10, and both ends thereof are fastened by the nut 16b at the left end and the similar nut at the right end.

[0003]

In the prior art such as 253, the tightening force of the hollow expansion ring 17 on the hollow shaft 10 is near and between the nut 16b at the left end and the nut at the right end of the hollow shaft 10. Since it is not uniform in the central portion, the hollow expansion ring body 17 in the central portion where the thrust load due to the nut 16b and the nut at the right end portion is difficult to be transmitted is displaced or rotated or slid with respect to the hollow shaft 10. However, the transmission of rotational force to a core tube such as a paper tube tends to be insufficient.

Further, in the configuration of 253, the spacer ring 1
8. In addition to the hollow expansion ring 17, an inner ring 19 is required, which increases the number of parts and increases the cost. In FIG. 14, 11 is a cylinder, 12b is a journal shaft, 13b is a threaded portion,
14b is an end ring, 15b is a holding ring, 25 is a check valve plug, 17a and 17b in FIG. 15 are the inner peripheral edges of the hollow expansion ring 17, 20 is a tapered surface, 21 and 22
Is a tapered surface, 23 is a hole in the cylindrical body 11, and 24 is a hole in the inner ring 19.

In the above case, in order to transmit the thrust load in the axial direction, the spacer rings 18 from both sides of the hollow shaft 10,
It is necessary not only to tighten the nut 16b and the same nut at the right end and the press ring 15b so as to sandwich the hollow expansion ring 17, but also to taper the spacer ring 18, the hollow expansion ring 17, and the inner ring 19. High cost. Further, even if the taper processing is performed, the thrust load cannot be sufficiently transmitted to the hollow expansion ring body 17 located in the central portion.

[0006]

(Means for Solving the Problems) (Claim 1) In FIG. 1, an outer peripheral surface concentric with a center line of the hollow shaft and the outer peripheral surface are provided on an outer circumference of a hollow shaft having one end closed and an air nozzle at the other end. Inwardly-flange-shaped wall portions that extend inward from the opposite ends of the wall surface inwardly orthogonal to the center line, and cylindrical portions that are continuous with the inner peripheral edge of the wall surface portion and that are concentric with the center line and extend outward in opposite directions to each other. Tightly fit a number of hat-shaped hollow expansion rings that are close to each other in cross section including the center line of the hollow shaft and tightly seal each tubular part to the hollow shaft. The pneumatic core clamp shaft is characterized in that a hollow expansion ring is provided in the hollow shaft, and each hollow expansion ring is communicated with the hollow shaft through a radial through hole formed in the hollow shaft. All the hollow expansion rings 2 are airtightly fixed to the hollow shaft 1 by the fasteners 3.

(Invention of Claim 2) With the pneumatic core clamp shaft of Claim 1, the tubular parts 2a, 2a of the two hollow expansion ring bodies 2 which are close to each other are simultaneously tightened by one tightening tool 4 (Fig. 5). is there.

(Invention of Claim 3) An annular projection 5b for compressing the cylindrical portion 2a of the hollow expansion ring is provided on the inner peripheral surface 5a of the fastener 5 (Fig. 8). 2 is a pneumatic core clamp shaft. The cylindrical portion 2a is pressed by the protruding portion 5b.

[0009]

1 to 3 show a pneumatic core clamp shaft A to which the invention of claim 1 is applied. In FIG. 2, which is an enlarged side view of FIG. The clamp shaft A includes a hollow shaft 1 made of, for example, carbon fiber reinforced plastic (CFRP), a plurality of hollow expansion rings 2 made of, for example, synthetic rubber, which are fitted to the hollow shaft 1, and the hollow expansion ring 2 made of the hollow shaft 1. Fastening tool 3 made of steel, for example
And so on.

As shown in FIG. 1, the hollow shaft 1 has an air nozzle 31 at one end, and the air nozzle 31 has opening / closing valves 41 and 43.
1 is connected to the discharge port of the compressor 30 through a pipe 42 having a closed end, and the other end (right end in FIG. 1) is closed. It is provided at a plurality of locations so as to correspond to the hollow portion 2c of the ring body 2.

An on-off valve 41 is provided on the main pipe of the pipe 42, an on-off valve 43 is provided on a branch pipe of the pipe 42 between the on-off valve 41 and the air nozzle 31, and the tip of the on-off valve 43 is open. When 41 is closed and the on-off valve 43 is opened, the pressure in the hollow shaft 1 and the hollow portion 2c becomes atmospheric pressure. When the paper tube 32 is fitted, the open / close valve 41 is closed and the open / close valve 43 is open.
The pressure in the hollow shaft 1 and the hollow portion 2c is atmospheric pressure, the hollow expansion ring 2 is not expanded, the paper tube 32 is fitted into the hollow shaft 1, and the paper tube 32 and the hollow shaft 1 are integrated. At this time, the on-off valve 41 is opened and the on-off valve 43 is closed, and the pressure in the hollow shaft 1 and the hollow portion 2c is the pressure required to integrate the paper tube 32 into the hollow shaft 1, resulting in a hollow expansion. The ring body 2 expands and is integrated with the hollow shaft 1. Further, when the paper tube 32 is removed from the hollow shaft 1, the open / close valve 41 is closed and the open / close valve 43 is opened to bring the pressure in the hollow shaft 1 and the hollow portion 2c to the atmospheric pressure to expand the hollow expansion ring body. 2 is returned to the normal state, the paper tube 32 and the hollow shaft 1 are separated, and the paper tube is removed from the hollow shaft 1.

The hollow expansion ring body 2 is an enlarged view of a cross section including the center line C of the hollow shaft 1, and an outer peripheral surface 2d concentric with the center line C and a center line from both ends of the outer peripheral surface 2d. A hat having an inward flange-shaped wall surface portion 2e that extends in the inward direction orthogonal to C, and cylindrical portions 2a that are continuous with the inner peripheral edge of the wall surface portion 2e and that are concentric with the center line C and that extend outward in opposite directions to each other on both sides. It has a shape and has an outer peripheral surface 2d (outer peripheral wall), and an annular hollow portion 2c formed by a wall surface portion 2e and a cylindrical wall surface 1b.
The hollow portions 2c of all the hollow expansion ring bodies 2 are respectively hollow shafts 1
The hollow shaft 1 and the hollow portion 2c are always communicated with each other by arranging the hollow shaft 1 and the at least one through hole 1a. Also, two adjacent tubular portions 2a, 2a in FIG.
Since the gap 3c is provided between them, the deformation of the tubular portion 2a when the fastener 3 is tightened can be absorbed, and the fastener 3 can be sufficiently tightened.

The fastener 3 is a wall surface portion 2e of the hollow expansion ring body 2.
2 is a ring having a substantially square cross section for holding the tubular portion 2a in a state of being abutted against, and the III-III cross section of FIG. 2 has a shape as shown in FIG. In FIG. 3, the fastener 3 is a steel ring having a notch 8, a through hole 7 having a seat 7a for seating a bolt head of a bolt 9 on one side of the notch 8 and a screw hole 7 on the other side. 'Is provided on the tangent line, the bolt 9 is inserted from the side of the through hole 7 and screwed into the screw hole 7'and tightened. Before tightening the tightening tool 3, a gap is provided in the cut 8 so that the tubular portion 2a can be sufficiently tightened (up to the state shown in FIG. 3) with the bolt 9. Therefore, before tightening the bolt 9, the fastener 3 can be easily inserted into the tubular portion 2a.

The fastener 3 can also fasten the tubular portion 2a of the hollow expansion ring body 2 with a structure other than that shown in FIG. 3, does not project from the outer peripheral surface 2d of the hollow expansion ring body 2, and has a paper tube 32 (see FIG. 1, 4)
Is not obstructed when it is fitted into the pneumatic core clamp shaft A according to the present invention, or when the hollow expansion ring 2 is expanded and the paper tube 32 is supported so as to be integrated with the hollow shaft 1. . For example, as shown in FIG. 16, the block 3 having a hole 36 in the tangential direction at the end of the outer peripheral surface of the substantially C-shaped steel plate ring for fixing the bolt 34 and the nut 35 to the fastener 3 '.
Weld 7 respectively. Although not shown, the wire may be wound around the tubular portion 2a about twice, and both ends thereof may be helically tightened with pliers to be fixed.

FIGS. 4 to 6 show a pneumatic core clamp shaft A to which the invention of claim 2 is applied. In FIG. 5, which is an enlarged side view of FIG.
Is disposed between the hollow expansion ring bodies 2 and 2, and two adjacent tubular portions 2a are simultaneously fixed by one fastening tool 4. At this time, both side surfaces of the fastener 4 are adjacent to the wall surface portion 2
e, 2e, so that the adjacent hollow expansion rings 2, 2 are closest to each other. Further, since the gap 4c is provided between the two adjacent tubular portions 2a, 2a in FIG. 5, the deformation of the tubular portion 2a when the fastening tool 4 is fastened can be absorbed, and the fastening tool 4 can be secured. Can be fully tightened.

7 to 9 show a pneumatic core clamp shaft A to which the invention of claim 3 is applied, and a tightening tool 5 is shown in FIG. 8 in which a part of FIG. 7 showing a longitudinal side view is enlarged.
An annular inwardly projecting portion 5b is provided on the inner peripheral surface 5a, and the cylindrical portion 2a of the hollow expansion ring body 2 is pressed by the projecting portion 5b. At that time, an annular protrusion 2b is also provided on the outer peripheral end of the tubular portion 2a on the hollow expansion ring 2 side, and the protrusion 5b and the protrusion 2b are used to press the tubular portion 2a while tightening the fastener. The pressure contact state between the both side surfaces of 5 and the wall surface portion 2e is secured. The two fasteners 5 in FIG. 8 are in contact with each other.

10 to 12 show a pneumatic core clamp shaft A to which the inventions of claims 2 and 3 are applied, and an enlarged view of a part of FIG. 10 showing a longitudinal side view.
In FIG. 1, two adjacent tubular portions 2a, 2a are simultaneously fixed by one fastening tool 6. Alternatively, two tubular portions 2a, 2a adjacent to each other by the fastener 6 are fixed at the same time, and annular and inwardly projecting portions 6b provided at both ends of the fastener inner peripheral surface 6a have hollow expansion ring bodies 2. The base portion of the tubular portion 2a of is fastened. An annular projection 2b provided on the outer peripheral tip of the tubular portion 2a is adjacent to the projection 6b and prevents the tubular portions 2a from moving in the axial direction with respect to the fastener 6. Also, adjacent 2
Since the gap 6c is provided between the two tubular portions 2a, 2a, the deformation of the tubular portion 2a when the fastening tool 6 is fastened can be absorbed, and the fastening tool 6 can be sufficiently fastened.

FIG. 13 shows that the pneumatic core clamp shaft A according to the second and third aspects has a relatively short length with respect to the pneumatic core clamp shaft A.
It is the figure which fitted the paper tube 32 which wound. Arrow 40
The hollow expansion ring 2 shown by does not support the paper tube 32,
When the internal pressure in the hollow shaft 1 increases, the fasteners 5 and 6 support the hollow expansion ring body 2 and maintain the airtightness between the hollow shaft 1 and the hollow expansion ring body 2.

[0019]

【The invention's effect】

(Invention of Claim 1) (1) Since all the hollow expansion ring bodies 2 can be clamped by the fasteners 3 substantially uniformly at any position in the longitudinal direction, compared with the conventional configuration as shown in FIGS. 14 and 15. , Paper tube (core tube)
Transmission of the rotational force of the hollow shaft 1 to 32 can be made uniform in any of the hollow expansion ring bodies 2, and the hollow expansion ring body 2 does not rotate or slide with respect to the hollow shaft 1. .

(2) As shown in FIGS. 14 and 15, the holding ring 15b (also at the right end) and the inner ring 19 which are indispensable for the conventional pneumatic core clamp shaft are not necessary in the present invention. It is possible to reduce costs by reducing

(3) Nut 1 which is indispensable for the conventional pneumatic core clamp shaft as shown in FIGS. 14 and 15.
Since 6b (also at the right end) is unnecessary in the present invention, it is possible to secure a wide effective support interval for the paper tube (core tube),
A longer paper tube (core tube) can be supported.

(4) When supporting a short paper tube (core tube), in the prior art, the plurality of hollow expansion ring bodies 17 are not individually tightened as shown in FIGS. When the pressure becomes high, the hollow expansion ring 17 at the position where the paper tube (core tube) does not come easily separates from the hollow shaft 10, and the airtightness between the hollow expansion ring 17 and the hollow shaft 10 is not maintained. Although difficult, according to the invention of claim 1, even if there is a hollow expansion ring body 2 without a supporting paper tube (core tube) 32 as shown by an arrow 40 portion in FIG. Since they are firmly fixed to the hollow shaft 1 by fasteners 5 and 6, respectively, the airtightness between the hollow expansion ring body 2 and the hollow shaft 1 should be kept good even if the pressure in the hollow portion 2c becomes high. You can

(Invention of Claim 2) (1) Where two fasteners 3 are required between two adjacent hollow expansion ring bodies 2 in claim 1, one tubular portion 2a is fixed by one. Therefore, it is possible to reduce the number of parts, simplify the assembling work, and reduce the cost.

(Invention of Claim 3) (1) An annular protrusion 5b provided on the inner peripheral surface 5a (FIG. 8) of the fastener, or an annular protrusion 5b provided on the inner peripheral surface 6a of the fastener (FIG. 11). Since the protruding portion 6b presses the tubular portion 2a of the hollow expansion ring body 2, the hollow expansion ring body 2 can be firmly fixed to the hollow shaft 1 and the airtightness can be enhanced.

(2) The annular projection 5b provided on the inner peripheral surface 5a of the fastener (FIG. 8) presses the tubular portion 2a of the hollow expansion ring body 2 to enhance airtightness, and the fastener The annular protrusion 5b provided on the inner peripheral surface 5a meshes with the annular protrusion 2b provided on or formed on the tubular portion 2a of the hollow expansion ring body 2, or the fastener inner peripheral surface 6a (FIG. 11). The annular protrusion 6b provided on the
The cylindrical portion 2a of the hollow expansion ring 2 is pressed to improve airtightness,
In addition, the annular projection 6b provided on the inner peripheral surface 6a of the fastener and the annular projection 2b provided or formed on the tubular portion 2a of the hollow expansion ring body 2 mesh with each other, and the hollow expansion ring body 2 receives the hollow shaft 1 Even when a load is applied in a direction parallel to the center line C of the hollow expansion ring body 2, the hollow expansion ring body 2 remains firmly fixed to the hollow shaft 1 and is adjacent to the hollow shaft 2.
Since the annular protrusions 2b of the two tubular portions 2a and the two annular protrusions 6b provided on the one fastener 6 are adjacent to each other in a meshed manner, the hollow expansion ring body 2 is displaced from the hollow shaft 1. It does not rotate or slide, and airtightness is not impaired.

If the paper tube (core tube) 32 is short (FIG. 13), there may be a plurality of hollow expansion rings 2 that do not support the paper tube (core tube) 32, but in such a case as well. An annular protrusion 5b provided on the fastener 5 (FIG. 8) and a fastener 6 (FIG. 1)
Since the annular protrusion 6b provided in 1) presses the tubular portion 2a of the hollow expansion ring body 2, it can be firmly fixed to the hollow shaft 1 and airtightness can be maintained.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of a pneumatic core clamp shaft to which the invention of claim 1 is applied.

FIG. 2 is a partially enlarged view of FIG.

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

FIG. 4 is a partially longitudinal side view of a pneumatic core clamp shaft to which the invention of claim 2 is applied.

5 is a partially enlarged view of FIG.

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

FIG. 7 is a partially longitudinal side view of a pneumatic core clamp shaft to which the inventions of claims 1 and 3 are applied.

8 is a partially enlarged view of FIG.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a partially longitudinal side view of a pneumatic core clamp shaft to which the inventions of claims 2 and 3 are applied.

11 is a partially enlarged view of FIG.

12 is a sectional view taken along line XII-XII of FIG.

13 is a partially longitudinal side view showing a state where a short paper tube (core tube) is attached to the pneumatic core clamp shaft of FIG.

FIG. 14 is a partially longitudinal side view of a conventional example.

FIG. 15 is a partially enlarged view of FIG.

FIG. 16 is a perspective view showing another example of the fastener in the present invention.

[Explanation of symbols]

 1 Hollow Shaft 1a Through Hole 2 Hollow Expansion Ring 2a Cylindrical Part 3 Tightening Tool 4 Tightening Tool 5 Tightening Tool 5a Tightening Tool Inner Surface 5b Protrusion 6 Tightening Tool 6a Tightening Tool Inner Surface 6b Projection Part 31 Air nozzle C Center line

Claims (3)

(57) [Claims] 1. An inner peripheral surface of a hollow shaft having one end closed and an air nozzle at the other end, which is concentric with the center line of the hollow shaft, and an inner side extending from both ends of the outer peripheral surface in a direction orthogonal to the center line. A hat shape in which a wall surface of a facing flange shape and a cylindrical portion that is continuous with the inner peripheral edge of the wall surface portion and that extends concentrically with the center line and extends outward in opposite directions to each other have cross sections including the center line of the hollow shaft facing each other. A number of hollow expansion rings are fitted close to each other, and each tubular part is attached to the hollow shaft airtightly with a fastener having a smaller outer diameter than the hollow expansion ring, and each hollow expansion ring is attached to the hollow shaft. A pneumatic core clamp shaft, characterized in that it is made to communicate with the inside of a hollow shaft by a provided through hole in the radial direction. 2. The pneumatic core clamp shaft according to claim 1, wherein the tubular portions of the two hollow expansion ring bodies adjacent to each other are simultaneously fastened with one fastening tool. 3. The annular protrusion that compresses the tubular portion of the hollow expansion ring body is provided on the inner peripheral surface of the fastening tool.
Pneumatic core clamp shaft.