Device and method of manufacturing support shaft cover

Abstract

To provide a device and a method for manufacturing a support shaft cover which can properly prevent ink smudges of a support shaft at low costs.SOLUTION: A support shaft cover manufacturing device 1 includes: a cylindrical casing 11; an inner surface presser 12 which is a metal plate formed in a cylindrical shape with an outer diameter larger than an inner diameter of the casing 11; an air supply part 13 which is disposed at one end in a center axis direction of the casing 11 to supply heated air to the inside of the casing 11; and an exhaust part 14 which is disposed at the other end in the center axis direction of the casing 11 to exhaust air inside of the casing 11. Further, the inner surface presser 12 is inserted into a support shaft cover material 201, which is disposed inside the casing 11 in a wound state and a flexible plate material made of a thermoplastic resin, in a rolled state so that its diameter is reduced and presses the support shaft cover material 201 against an inner peripheral surface of the casing 11 with restoring force of the inner surface presser 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for manufacturing a support shaft cover that prevents ink stains on the plate cylinder support shaft of a gravure printing press. [Background technology]

[0002] A gravure printing press prints by transferring ink to a web pressed against the outer peripheral surface of a rotating plate cylinder. In general, ink is applied to the plate by immersing part of the rotating plate cylinder in ink stored in an ink pan and scraping off excess ink with a doctor blade positioned in contact with the plate cylinder.

[0003] The plate cylinder is supported at both ends by support shafts installed in the gravure printing press, and rotates when one of the support shafts is driven to rotate. Therefore, when ink adheres to the plate cylinder (mainly when scraping it off with a doctor blade), the ink splatters around the support shaft supporting the plate cylinder, causing the periphery of the plate cylinder to become soiled with ink. Furthermore, as printing speeds increase, the amount of soiling caused by ink splatter tends to increase. Removing the adhered ink requires a great deal of effort, which significantly reduces work efficiency.

[0004] As a method for preventing such ink stains, a method for protecting the support shaft with a cover member has been developed. For example, Patent Document 1 discloses a method for preventing ink stains on the support shaft by attaching a cylindrically wound piece of cardboard with tape around a non-rotating sleeve that is placed on the outer periphery of the support shaft, thereby covering the rotating part of the support shaft with the cardboard. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-76375 Summary of the Invention [Problem to be solved by the invention]

[0006] In the method of Patent Document 1, the rolled cardboard is attached to the sleeve with tape, so when adjusting the attachment position, the tape needs to be removed and reattached. In addition, since it is required to tape multiple places, it is time-consuming to remove and reattach the tape every time the printing cylinder is replaced.

[0007] The present invention has been made in view of the above circumstances, and has an object to provide a manufacturing device and manufacturing method for a support shaft cover that can inexpensively and appropriately prevent ink stains on the support shaft. [Means for solving the problem]

[0008] In order to achieve the above object, a support shaft cover manufacturing apparatus according to a first aspect of the present invention comprises: a cylindrical casing; an inner surface support that is a cylindrical metal plate having an outer diameter larger than the inner diameter of the casing; an air supply unit disposed at one end of the casing in a central axis direction and having an air supply port for supplying heated air into the casing; an exhaust unit disposed at the other end of the casing in the central axis direction and having an exhaust port for discharging air inside the casing, The inner surface retainer is The support shaft cover material is a flexible thermoplastic resin plate material that is wound and placed inside the casing, and is inserted in a wound state so that the diameter becomes smaller, The restoring force of the inner surface retainer presses the support shaft cover material against the inner peripheral surface of the casing.

[0009] The air supply unit is provided with a connection unit that is connected to an outlet of a heating means that delivers heated air. This may also be the case.

[0010] In addition, in a method for manufacturing a support shaft cover according to a second aspect of the present invention, Inserting the support shaft cover material in a wound state into the support shaft cover manufacturing apparatus according to the first aspect, The inner surface retainer is inserted into the inside of the support shaft cover material in a rolled-up state so as to reduce the diameter, Heated air is supplied from the air inlet to heat and deform the plate material, thereby forming a cylindrical support shaft cover having a winding spring property. [Effects of the Invention]

[0011] According to the support shaft cover manufacturing device and manufacturing method of the present invention, a support shaft cover that prevents ink stains on the support shaft of a gravure printing machine can be manufactured inexpensively and simply. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a support shaft cover manufacturing apparatus according to an embodiment of the present invention. [Figure 2] A cross-sectional view of A-A' in Figure 1. [Figure 3] 3A to 3C are diagrams showing a support shaft cover manufacturing device according to an embodiment, in which (A) is a left side view, (B) is a front view, and (C) is a right side view. [Figure 4] 5A to 5C are diagrams showing a casing according to an embodiment, in which (A) is a left side view, (B) is a front view, and (C) is a right side view. [Figure 5] (A) is a diagram showing the state in which the support shaft cover material is inserted into the casing, and (B) is a diagram showing the state in which the inner surface retainer is inserted into the casing. [Figure 6] 10A and 10B are diagrams showing the state before the support shaft cover is attached to the support shaft, in which (A) is a front view and (B) is a side view. [Figure 7] 10A and 10B are diagrams showing the state in which the support shaft cover is attached to the support shaft, in which (A) is a front view and (B) is a side view. DETAILED DESCRIPTION OF THE INVENTION

[0013] A support shaft cover manufacturing apparatus 1 according to an embodiment of the present invention will be described below with reference to the drawings. As shown in the schematic diagram of Fig. 1 and the cross-sectional view of Fig. 2, the support shaft cover manufacturing apparatus 1 according to this embodiment includes a casing 11, an inner surface holder 12, an air intake section 13, and an exhaust section 14.

[0014] The casing 11 is a cylindrical member that constitutes the main body of the support shaft cover manufacturing apparatus 1. The casing 11 is made of a material that is heat-resistant enough to be able to heat and form the flexible thermoplastic resin plate material (hereinafter referred to as support shaft cover material 201) that is the material for the support shaft cover 20, and is made of, for example, an inexpensive and easily available steel pipe. In this embodiment, a seamless steel pipe is used as the material for the casing 11 to prevent deformation due to heat.

[0015] As shown in FIG. 2, the inner surface retainer 12 is disposed inside the casing 11. The inner surface retainer 12 is a member such as a metal plate that has heat resistance sufficient to enable the support shaft cover material 201 to be heated and shaped. The inner surface retainer 12 has a plurality of holes formed therein so that the heated air passing through the inside of the casing 11 can properly reach the support shaft cover material 201 disposed between the casing 11 and the inner surface retainer 12. The inner surface retainer 12 is made of, for example, punched metal. The opening ratio of the inner surface retainer 12 is preferably 30% or more to allow the heated air to easily reach the support shaft cover material 201, and is preferably 60% or less to maintain strength.

[0016] In the method for manufacturing a support shaft cover 20 using the support shaft cover manufacturing apparatus 1 according to this embodiment, a support shaft cover material 201 in a wound state, i.e., in a cylindrically rolled state, is inserted into the inside of a casing 11. Furthermore, a cylindrical inner surface retainer 12 is inserted inside the support shaft cover material 201. The inside of the casing 11 is then heated with heated air, and the support shaft cover material 201 arranged between the inner peripheral surface of the casing 11 and the outer peripheral surface of the inner surface retainer 12 is formed into a cylindrical support shaft cover 20.

[0017] The inner diameter of casing 11 is set to be smaller than the outer diameter of the support shaft to which support shaft cover 20 is attached. For example, if the outer diameter of the support shaft to which support shaft cover 20 is to be attached is 115 mm, the inner diameter of casing 11 may be about 90 mm, or about 80% of the outer diameter of the support shaft. In this way, the inner diameter of support shaft cover 20 is formed to be smaller than the outer diameter of the support shaft.

[0018] Furthermore, the outer diameter (outer diameter in its natural state) of the cylindrically formed inner surface retainer 12 may be set based on the inner diameter of the casing 11, the thickness of the support shaft cover material 201, etc., so that the inner surface retainer 12 presses the support shaft cover material 201 with its restoring force. For example, even if the thickness of the support shaft cover material 201 is thin, the outer diameter of the inner surface retainer 12 is set larger than the inner diameter of the casing 11 so that the restoring force of the inner surface retainer 12 can reliably press the support shaft cover material 201 against the inner surface of the casing 11.

[0019] As shown in the front and side views of FIGS. 3(A) to 3(C), an air intake unit 13 is disposed at one end of the casing 11 in the central axis direction. The air intake unit 13 includes a base portion 13a that closes one end of the casing 11 and an air intake port 13b that supplies heated air to the casing 11 to heat the interior of the casing 11. The air intake unit 13 and the casing 11 are fixed together by tightening nuts onto bolts that pass through through holes 13c formed in the base portion 13a of the air intake unit 13 and through holes 11b formed in the flange portion 11a of the casing 11, as shown in FIGS. 3(A) to 3(C) and 4(A) to 4(C), for example. This allows easy switching between an open state in which the support shaft cover material 201 is inserted or removed from the casing 11 and a heated state in which the end of the casing 11 is covered after the support shaft cover material 201 is inserted, by tightening or loosening the fixing bolts.

[0020] Air intake port 13b is a through-hole formed in plate-shaped base portion 13a. Air intake portion 13 may include a connecting portion 13d that connects air intake portion 13 to a heating means that delivers heated air. More specifically, connecting portion 13d is cylindrically erected from base portion 13a around air intake port 13b. Connecting portion 13d is formed so that an outlet of a heating means that delivers heated air, such as a heat gun, can be inserted into connecting portion 13d. This makes it possible to attach a general heating means, such as a heat gun, to connect portion 13d and deliver heated air into casing 11, thereby easily heating support shaft cover material 201 inserted in casing 11 without using special equipment.

[0021] An exhaust unit 14 is disposed at the other end of the casing 11 in the central axis direction (the end opposite the air intake unit 13). The exhaust unit 14 includes a base unit 14a that closes one end of the casing 11, and an exhaust port 14b for discharging hot air supplied from the air intake port 13b into the inside of the casing 11. The exhaust unit 14 may be fixed to the casing 11 by welding or the like, or may be fixed by tightening a nut onto a bolt that is passed through a through hole 14c formed in the base unit 14a of the exhaust unit 14 and a through hole 11d formed in the flange unit 11c of the casing 11.

[0022] Next, a method for manufacturing the support shaft cover 20 using the support shaft cover manufacturing apparatus 1 according to this embodiment will be described.

[0023] First, remove the fixing bolts that fix the air intake unit 13 to the casing 11, and open one end of the casing 11. If the air intake unit 13 is rotated with one of the fixing bolts loosened without being removed, the opening of the casing 11 can be easily opened and closed.

[0024] A thermoplastic resin plate (support shaft cover material 201) that will form the support shaft cover 20 is rolled into a cylindrical shape and inserted into the interior of the casing 11 (FIG. 5(A)). While the material for the support shaft cover material 201 is not particularly limited, it is preferable that it be solvent-resistant and that any ink adhering to it be easily removed (i.e., that the coating film has good peelability). For example, a synthetic resin such as ultra-high molecular weight polyethylene, which is readily available and has high dimensional stability, can be used. The support shaft cover material 201 may have any thickness that allows it to maintain its shape so as to have a springy winding property and to exert a holding force to hold the support shaft of the plate cylinder 40 of the gravure printing press. For example, when ultra-high molecular weight polyethylene is used as the support shaft cover material 201, the plate thickness can be approximately 2 mm.

[0025] After inserting the support shaft cover material 201 into the casing 11, the inner surface retainer 12 is inserted into the inside of the casing 11 (FIG. 5(B)). The natural outer diameter of the inner surface retainer 12 is formed to be larger than the inner diameter of the casing 11. Therefore, the inner surface retainer 12 is inserted inside the support shaft cover material 201 in a rolled-up state so that its outer diameter is smaller than the inner diameter of the support shaft cover material 201 inside the casing 11. The inner surface retainer 12 inserted into the casing 11 presses the support shaft cover material 201 against the inner surface of the casing 11 by its own restoring force.

[0026] Next, air intake part 13 is fixed to casing 11 with fixing bolts so as to cover the opening of casing 11. Furthermore, an outlet of a heat gun, which is heating means, is connected to connection part 13d of air intake part 13.

[0027] Next, the heat gun is operated to supply heated air into the inside of the casing 11, thereby heating the support shaft cover material 201 inserted inside the casing 11. The heating temperature and heating time may be set so that the support shaft cover material 201 can be molded. For example, in the case of the ultra-high density polyethylene according to this embodiment, the heat distortion temperature is about 75°C, so the temperature may be set to about 85°C to 100°C. The heating time may be set based on the thickness and size of the material, for example, about 5 minutes.

[0028] The support shaft cover material 201 is heated while pressed against the inner surface presser 12, and is thereby formed to conform to the inner peripheral shape of the casing 11. After the set heating time has elapsed, the air blowing from the heat gun is stopped. After heating has been completed, the heat gun is removed from the air intake port 13b, and the casing 11 is allowed to cool. There are no particular limitations on the cooling method for the casing 11, and it may be allowed to cool naturally, for example, by leaving it at room temperature.

[0029] The cooled support shaft cover material 201 is fixed in a shape that conforms to the inner circumferential shape of the casing 11. Through the above steps, a cylindrical support shaft cover 20 having winding spring properties is formed.

[0030] The following describes how to use the support shaft cover 20 manufactured by the manufacturing method according to this embodiment. The inner diameter of the support shaft cover 20 formed by the above-described support shaft cover manufacturing method is set to be smaller than the outer diameter of the support shaft of the plate cylinder 40 of the gravure printing press. More specifically, the inner diameter of the support shaft cover 20 is set to be smaller than the outer diameter of a non-rotating sleeve member (fixed support shaft 32) that is arranged outside the rotating support shaft 31 that supports the plate cylinder 40.

[0031] The worker unfolds the support shaft cover 20 and then attaches it by wrapping it around the fixed support shaft 32 (Figs. 6(A) and (B)). The support shaft cover 20 uses its own elasticity to hold the support shaft as a winding spring, so it can be fixed using only the support shaft cover 20 without using a fixing method such as clips or tape (Figs. 7(A) and (B)).

[0032] As described above, the support shaft cover manufacturing apparatus and support shaft cover manufacturing method of this embodiment make it possible to inexpensively and easily manufacture support shaft covers that prevent ink stains on the support shaft of a gravure printing machine. [Explanation of symbols]

[0033] 1 support shaft cover manufacturing device, 11 casing, 11a, 11c flange portion, 11b, 11d through hole, 12 inner surface retainer, 13 air intake portion, 13a base portion, 13b air intake port, 13c through hole, 13d connection portion, 14 exhaust portion, 14a base portion, 14b exhaust port, 14c through hole, 20 support shaft cover, 201 support shaft cover material, 31 rotating support shaft, 32 fixed support shaft, 40 printing cylinder

Claims

1. a cylindrical casing; an inner surface support that is a cylindrical metal plate having an outer diameter larger than the inner diameter of the casing; an air supply unit disposed at one end of the casing in a central axis direction and having an air supply port for supplying heated air into the casing; an exhaust unit disposed at the other end of the casing in the central axis direction and having an exhaust port for discharging air inside the casing, The inner surface support is The support shaft cover material is a flexible thermoplastic resin plate material that is wound and placed inside the casing, and is inserted in a wound state so that the diameter becomes smaller, The support shaft cover material is pressed against the inner circumferential surface of the casing by the restoring force of the inner surface presser. A support shaft cover manufacturing device characterized by:

2. the air supply unit includes a connection unit that is connected to an outlet of a heating means that delivers heated air; 2. The support shaft cover manufacturing apparatus according to claim 1.

3. The support shaft cover material in a wound state is inserted into the support shaft cover manufacturing apparatus according to claim 1 or 2, The inner surface retainer is inserted into the inside of the support shaft cover material in a rolled-up state so as to reduce the diameter, Heated air is supplied from the air inlet to heat and deform the plate material, thereby forming a cylindrical support shaft cover having a winding spring property. A method for manufacturing a support shaft cover.

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