JP2004115181A - Shock absorbing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To absorb impulsive force acting on a web. <P>SOLUTION: A movable pass roller 84 is lowered by releasing the support force of an air cylinder 86 supporting the pass roller 84 as a tension free mechanism, and an old web W1 and a new web W2 are bonded by loosening the old web W1. After completion of bonding, the support force of the air cylinder 86 is set 10 to 20% higher than the pressure received from the web by generating the support force of the air cylinder 86 and lifting the movable pass roller 84. When the looseness is eliminated and the web is simultaneously suddenly tightened, the movable pass roller 84 lowers to absorb the impulsive force acting on the web with an air cushion. At the time of regular traveling, a support force of the air cylinder is switched to the magnitude so that the movable pass roller does not lower with the fluctuation of the web tension. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impact absorbing device that absorbs an impact force acting on a web traveling on an equipment line, and more particularly to an impact absorbing device that absorbs an impact force that is generated when a web that has once slackened when the webs are joined.
[0002]
[Prior art]
A photosensitive lithographic printing plate (hereinafter referred to as “PS plate”) is generally obtained by subjecting a coiled aluminum plate (hereinafter referred to as “web”) to surface treatment such as brushing, anodizing, and chemical conversion treatment alone or in combination as appropriate. Then, the coating liquid is applied to the drying process after the coating process.
[0003]
In the most upstream part of such a PS plate equipment line, as shown in FIG. 7, a coil 20 in which a long web (referred to as “old web W <b> 1”) is wound around a core 16 for convenience of explanation. A two-shaft type feeder 12 in which a coil 22 in which a new web W2 to be fed next is wound around the winding core 18 is loaded is provided.
[0004]
Then, in order to continuously feed the web without stopping the PS plate equipment line, the old web W1 fed to the equipment line is cut before the old web W1 of the loaded coil 20 disappears, and the old web W1. The end portion of the new web W2 unwound from the new coil 22 is joined to the terminal portion by a joining device 24 to maintain the web continuity.
[0005]
In order to join the webs with the joining device 24, it is necessary to stop the webs and release the tension to create a slack. When the joining operation is completed, the winding core 18 of the new web W2 is reversed to remove the slack, or the drive web 60 on the upstream side of the joining device 24 feeds forward to remove the slack.
[0006]
However, the moment the slack is taken, the web is pulled suddenly, so that a large impact load acts on the web, and the joint part may break or the web may jump and damage the equipment.
[0007]
Although there is no appropriate patent document, Japanese Patent Application Laid-Open No. 2001-2775653 describes a shock absorption of a lap.
[0008]
[Problems to be solved by the invention]
In view of the above facts, an object of the present invention is to absorb an impact force acting on a web.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is an impact absorbing device that absorbs an impact force acting on a web due to a variation in tension acting on a web traveling on an equipment line, and a roller that conveys the web, and a roller that is movable and elastic. And a buffer means for supporting it.
[0010]
In the first aspect of the present invention, the roller for conveying the web is supported elastically and movable by the buffer means. Therefore, even if an impact force is applied to the web traveling on the equipment line due to a change in tension, the roller moves while absorbing the impact force, so that the impact force acting on the web is absorbed.
[0011]
According to a second aspect of the present invention, the buffer means includes a shaft support means for supporting the roller so as to be movable, and an air cylinder for generating a support force for elastically supporting the shaft support means. It is characterized by that.
[0012]
In the invention described in claim 2, the buffer means includes shaft support means for supporting the roller so as to be movable, and the air cylinder supports the shaft support means by generating a support force. By using the air cushion of this air cylinder, the impact force acting on the web is absorbed.
[0013]
According to a third aspect of the present invention, there is provided a pneumatic circuit capable of switching a magnitude of a supporting force of the air cylinder.
[0014]
In the invention according to claim 3, the magnitude of the support force of the air cylinder can be switched by operating the pneumatic circuit. For example, the support force of the air cylinder is set to several times the pressure that the roller normally receives from the web when the web is running, so that the web can be supported as if it were a fixed roller.
[0015]
In addition, when the slack of the web is resolved, the air cylinder support force is set to a predetermined value higher than the pressure that the roller normally receives from the web, so that when the web is pulled suddenly, the roller moves and acts on the web. Can absorb the impact force.
[0016]
The invention described in claim 4 is characterized in that the support force of the air cylinder is controlled as follows.
[0017]
When the preceding web is cut and the subsequent web is joined, the supporting force is released and the roller is moved from a fixed position to cause the web to become slack. After the web is joined, the supporting force is generated to fix the roller. Returning to the position, setting the supporting force 10% -20% higher than the pressure the roller receives from the web during running, and taking the web slack, and absorbing the impact force generated on the web as the web slack is eliminated After the roller returns to a fixed position, the step of setting the support force at such a size that the roller does not move with the pressure received from the web during traveling is configured.
[0018]
In the invention according to the fourth aspect, the roller is also used as a tension-free roller that makes the web slack.
[0019]
The supporting force of the air cylinder is released and the roller is moved from a fixed position to cause the web to become slack and join the preceding web and the succeeding web. When the joining of the web is completed, the support force of the air cylinder is generated, the roller is returned to a fixed position, and the support force of the air cylinder at this time is set 10% to 20% higher than the pressure received from the web during traveling.
[0020]
Next, at the same time that the slack of the web is eliminated, when the web is pulled suddenly, the roller moves to absorb the impact force acting on the web. Next, after the impact force acting on the web is absorbed by the air cylinder and the roller returns to the fixed position, the support force of the air cylinder is set to a size that does not move with the pressure received from the web during traveling, The web can be supported in a stable state like a fixed roller.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Outline of PS line equipment line)
As shown in FIGS. 1 and 4, a biaxial feeder 12 is disposed in the most upstream part of the equipment line 10. A coil having a web (referred to as “old web W <b> 1” for convenience of explanation: a web fed in advance) wound around the core 16 in a roll shape is provided on one of the rotating arms 62 of the feeder 12. 20, and a coil 22 in which a web (referred to as “new web W <b> 2”: meaning the web being fed next) is wound around the core 18 in a roll shape on the other side of the rotating arm 62. Is loaded.
[0022]
Then, the rotating arm 62 is rotated around the shaft portion 64, and the positions of the coil 20 and the coil 22 are exchanged, whereby the new web W2 is fed out from the new coil 22, and the coil 20 is extracted, and the next new The coil is loaded.
[0023]
The old web W1 delivered from the delivery machine 12 passes through the joining device 24 and reaches an impact absorbing device 70, a drive conveyance device 60, and a reservoir device 26, which will be described later. When the reservoir device 26 temporarily stops and joins the old web W1 and the new web W2 with the joining device 24, the upper and lower rollers 26A approach and send out the accumulated old web W1 so that the equipment line does not stop. Is.
[0024]
For example, the old web W1 delivered from the reservoir device 26 includes, for example, a brushing / water washing treatment process 28, an alkali etching / water washing treatment process 30, a desmut treatment process 32, an electrolytic surface roughening treatment process 34, and an alkali etching treatment process 36. , Anodizing treatment step 38, sealing treatment step 40, hydrophilic treatment step 42, drying step 44, first photosensitive layer coating step 46, drying step 48, second photosensitive layer coating step 50, and drying step 52. It is accumulated in a reservoir device 54 provided for replacing the side winding core, and is wound around the winding core 56 as a web of a lithographic printing plate.
[0025]
Further, a bridle roll 58 (shown only in one place in FIG. 1) is provided between each process, and the old web W1 is conveyed at a predetermined speed and the web tension is cut. And the tension | tensile_strength required for each process is given to the old web W1.
(Joining equipment)
As shown in FIG. 2 (A), a clamper 66 that holds the old web W1 and a clamper 68 that holds the new web W2 are provided on the upstream side and the downstream side of the joining device 24. On the upstream side of the clamper 66, a guide roller 72 for guiding the old web W1 to an impact absorbing device 70 described later is provided, and on the upstream side of the clamper 68, a guide roller 74 for guiding the new web W2 to the joining portion is provided. It has been.
[0026]
A cutter 76, a welding machine 78, and a rolling roller 80 are disposed between the clamper 66 and the clamper 68. As shown in FIG. 2B, the cutter 76 cuts in a state where the rear end portion of the old web W1 gripped by the clamper 66 and the front end portion of the new web W2 gripped by the clamper 68 are overlapped.
[0027]
Next, as shown in FIG. 2C, the welding machine 78 applies ultrasonic waves to the butted portion and welds the cut surface of the old web W1 to the cut surface of the new web W2. When the welding is completed, the gripping state of the clampers 66 and 68 is released, and the bead B is rolled by the rolling roller 80 so as not to obstruct the web conveyance.
[0028]
In addition, as a joining method, there exists the method of joining with a tape, It is not specified to the joining method mentioned above.
(Shock absorber)
As shown in FIGS. 3 and 4, the impact absorbing device 70 includes a fixed pass roller 82 and a movable pass roller 84 that can move up and down. The shaft plate 90 that rotatably supports the movable pass roller 84 is fixed to the other end of a swing arm 88 that is rotatably attached to a frame 92 by a pin shaft 91.
[0029]
A central portion of the swing arm 88 is rotatably connected to a piston rod 86A of the air cylinder 86. By extending the piston rod 86A, the swing arm 88 is pushed up to a position where it comes into contact with the stopper 94, and the movable pass roller 84 is held at a fixed position. Further, the cylinder portion 86B of the air cylinder 86 is rotatably supported by a bracket 96 provided on the base so that the movement of the swing arm 88 can be followed.
[0030]
Further, as shown in FIG. 5, a pressure regulator 100 is connected to an air supply side port of the cylinder portion 86 </ b> B of the air cylinder 86 via an electromagnetic valve 98. Compressed air is sent from the compressor 102 to the pressure regulator 100. The solenoid valve 98, the pressure regulator 100, and the compressor 102 are connected to the controller 104, and are controlled based on a joining start signal and a joining completion signal transmitted from the joining device 24.
[0031]
Next, the operation of the shock absorber 70 according to this embodiment will be described.
[0032]
When the remaining amount of the old web W1 decreases, the feeding of the old web W1 is stopped (the conveying speed is zero), and the joining device 24 joins the rear end portion of the old web W1 and the front end portion of the new web W2.
[0033]
For this reason, first, as shown in FIG. 2A, the old web W1 is gripped by the clamper 66 and cut by the cutter 76. Here, as shown in FIGS. 4 and 6, the electromagnetic valve 98 is opened, air is exhausted from the air cylinder 86, and the supporting force for supporting the swing arm 88 is released. As a result, the piston rod 86A contracts due to the weight of the old web W1 and the movable pass roller 84, and the swing arm 88 rotates about the pin shaft 91 to lower the movable pass roller 84.
[0034]
When the movable pass roller 84 is lowered, as shown in FIG. 4, the old web W1 in the portion of the guide roller 72 is loosened, and the tension of the old web W1 becomes zero.
[0035]
Here, the new web W2 is gripped by the clamper 68, and the rear end portion of the old web W1 and the front end portion of the new web W2 are overlapped and cut as shown in FIG.
[0036]
Next, as shown in FIG. 2C, the welding machine 78 applies ultrasonic waves to the butted portion and welds the cut surface of the old web W1 to the cut surface of the new web W2. When the welding is completed, the gripping state of the clampers 66 and 68 is released, and the bead is rolled by the rolling roller 80.
[0037]
Before releasing the supporting force of the air cylinder 86, the air cylinder 86 is supplied with air pressure of 4 kgf / cm ² and is twice the tension acting on the normal running web (about 400 kg / width). The movable pass roller 84 does not descend even when the pressure is applied, so that a supporting force that can function as a fixed roller is generated. Here, “width” refers to the web width.
[0038]
When the joining operation is completed, the electromagnetic valve 98 is closed, and the pressure regulator 100 supplies air to the air cylinder 86 at an air pressure of ² kgf / cm ² . This is because the piston rod 86A contracts and the movable pass roller 84 descends when a pressure of about 10% to 20% (for example, 220 kg / width) of the tension (200 kg / width) acting on the normal running web is received. It is the size to do.
[0039]
When air is supplied as described above, the piston rod 86A extends to swing the swing arm 88, the shaft plate 88 hits the stopper 94, and the movable pass roller 84 returns to the home position. Here, when the new web W2 is sequentially fed by the drive conveyance device 60, the impact force (220 kg / width or more) acts on the new web W2 at the moment when the slack disappears.
[0040]
For this reason, while the movable pass roller 84 supported by the air cylinder 86 is lowered, the impact force acting on the new web W2 is absorbed, and in particular, the joint portion is prevented from being broken. When the impact force is absorbed, the tension of the new web W2 returns to the normal state of 200 kg / width, and the movable pass roller 84 also returns to the home position.
[0041]
Here, even if air pressure is supplied to the air cylinder 86 with an air pressure of 4 kgf / cm ^{2 and} the pressure applied to the web during normal running is doubled (about 400 kg / width), the movable pass roller 84 does not descend. To.
[0042]
In this embodiment, the air pressure of the air cylinder that receives the pressure of the web having a tension of 220 kg / width is 2 kgf / cm ² , and the air pressure of the air cylinder that receives the pressure of the web whose tension is 400 kg / width is 4 kgf / cm ² . However, it is needless to say that this set value needs to be changed in consideration of the width, thickness, quality, apparatus configuration, mechanical loss, tension control properties, etc. of the aluminum web used.
[0043]
Further, the impact force acting on the web is absorbed by using the movable pass roller that causes the web to be tension-free and causes slack. However, an impact absorbing device may be provided in a case different from the tension-free roller. . Furthermore, this shock absorbing measure is not limited to an application that absorbs tension fluctuations during joining.
[0044]
Further, the present invention is not limited to an impact absorbing device using an air cylinder, and a mechanism that supports a roller with a spring having a predetermined elastic coefficient when absorbing an impact force and locks the roller during normal traveling may be used.
[0045]
Furthermore, in this embodiment, the piston rod of the air cylinder is lowered by the weight of the movable pass roller and the web, but the movable pass roller may be actively lowered by sending compressed air to the exhaust port side of the cylinder portion. .
[0046]
Further, although the shaft plate of the movable pass roller is supported by the swing arm, the shaft plate may be directly supported by the piston rod of the air cylinder.
[0047]
Here, the manufacturing process of the PS plate will be described.
[0048]
The PS plate is a JIS-A1050 aluminum material containing 99.5% by weight aluminum, 0.01% by weight copper, 0.03% by weight titanium, 0.3% by weight iron and 0.1% by weight silicon. After the surface of the 0.30 mm thick rolled plate was grained using a 20 mesh% aqueous suspension of 400 mesh Pamiston (manufactured by Kyoritsu Ceramics) and a rotating nylon brush (6,10-nylon), Washed well with water.
[0049]
This was immersed in a 15% by weight aqueous sodium hydroxide solution (containing 4.5% by weight of aluminum) and etched so that the amount of aluminum dissolved was 5 g / m ² , and then washed with running water. Further, neutralized with 1% by weight nitric acid, and then in a 0.7% by weight nitric acid aqueous solution (containing 0.5% by weight of aluminum), a rectangular wave with an anode voltage of 10.5 volts and a cathode voltage of 9.3 volts Using an alternating waveform voltage (current ratio r = 0.90, current waveform described in the example of Japanese Patent Publication No. 58-5796), an electrolytic surface roughening treatment was performed at an anode time electric quantity of 160 coulomb / dm ^2. It was. After washing with water, it was immersed in a 10% by weight sodium hydroxide aqueous solution at 35 ° C., etched so that the amount of dissolved aluminum was 1 g / m ² , and then washed with water. Next, it was immersed in an aqueous sulfuric acid solution at 50 ° C. and 30% by weight, desmutted, and washed with water.
[0050]
Further, a porous anodic oxide film forming treatment was performed using a direct current in a 20 wt% sulfuric acid aqueous solution (containing 0.8 wt% aluminum) at 35 ° C. That is, electrolysis was performed at a current density of 13 A / dm ² and the weight of the anodic oxide film was adjusted to 2.7 g / m ² by adjusting the electrolysis time. In order to prepare a negative photosensitive lithographic printing plate using a diazo resin and a binder, this support was washed with water, immersed in a 3% by weight aqueous solution of sodium silicate at 70 ° C. for 30 seconds, and washed and dried.
[0051]
The thus-obtained aluminum support, Macbeth RD920 reflection density was measured with a reflection densitometer 0.30, the center line average roughness _{R a} as defined in JIS B00601 was 0.58 .mu.m.
[0052]
Next, a 1.0% by weight aqueous solution of methyl methacrylate / ethyl acrylate / 2-acrylamido-2-methylpropanesulfonic acid sodium copolymer (average molecular weight of about 60,000) (molar ratio 50/30/20) was applied to the support. It apply | coated so that the application quantity after drying might be set to 0.05 g / m < ² > with a roll coater.
[0053]
Furthermore, the following photosensitive solution-1 was applied using a bar coater and dried at 110 ° C. for 45 seconds. The dry coating amount was 2.0 g / m ² .
Photosensitive solution-1
Diazo resin-1 0.50g
Binder-1 5.00g
Stilite HS-2 (Daido Kogyo Co., Ltd.) 0.10g
Victoria Pure Blue BOH 0.15g
Tricresyl phosphate 0.50 g
Dipicolinic acid 0.20g
FC-430 (3M surfactant) 0.05 g
Solvent 1-methoxy-2-propanol 25.00g
Methyl lactate 12.00g
Methanol 30.00g
Methyl ethyl ketone 30.00g
3.00 g of water
The above diazo resin-1 was obtained as follows. First, 29.4 g of 4-diazodiphenylamine sulfate (purity 99.5%) was gradually added to 70 ml of 96% sulfuric acid at 25 ° C. and stirred for 20 minutes. To this, 3.26 g of paraformaldehyde (purity 92%) was gradually added over about 10 minutes, and the mixture was stirred at 30 ° C. for 4 hours to allow the condensation reaction to proceed. The condensation molar ratio between the diazo compound and formaldehyde is 1: 1. The reaction product was poured into 2 liters of ice water with stirring and treated with a cold concentrated aqueous solution in which 130 g of sodium chloride was dissolved. The precipitate was collected by suction filtration, and the partially dried solid was dissolved in 1 liter of water, filtered, cooled with ice, and treated with an aqueous solution in which 23 g of potassium hexafluorophosphate was dissolved. Finally, the precipitate was collected by filtration and air-dried to obtain 1 g of diazo resin.
[0054]
Binder-1 is a 2-hydroxyethyl methacrylate / acrylonitrile / methyl methacrylate / methacrylic acid copolymer (weight ratio 50/20/26/4, average molecular weight 75,000, acid content 0.4 meq / g). It is an alkali water-soluble film-forming polymer.
[0055]
Stylite HS-2 (manufactured by Daido Kogyo Co., Ltd.) is a polymer compound having higher oil sensitivity than the binder, and is styrene / maleic acid mono-4-methyl-2-pentyl ester = 50/50 (molar ratio). The average molecular weight was about 100,000. The mat layer was formed by spraying the mat layer forming resin solution onto the surface of the photosensitive layer thus prepared as follows.
[0056]
A 12% aqueous solution in which a part of a copolymer of methyl methacrylate / ethyl acrylate / 2-acrylamido-2-methylpropane sulfonic acid (feed weight ratio 65:20:15) copolymer is a sodium salt is prepared as a resin solution for forming a mat layer. Rotating atomizing electrostatic coating machine, atomizing head rotation speed 25,000rpm, resin liquid feed rate 4.0ml / min, applied voltage to atomizing head -90kV, ambient temperature at application is 25 ° C The relative humidity was 50%, and the coating surface was sprayed with steam for 2.5 seconds to wet the coating surface, and then 3 seconds after the wetting, hot air having a temperature of 60 ° C. and a humidity of 10% was sprayed for 5 seconds to dry. The average height of the mat was about 6 μm, the average size was about 30 μm, and the coating amount was 150 mg / m ² .
[0057]
【The invention's effect】
Since this invention was set as the said structure, the impact force which acts on a web can be absorbed.
[Brief description of the drawings]
FIG. 1 is a block diagram of an entire equipment line including an impact absorbing device according to the present embodiment.
FIG. 2A is a side view showing a facility line joining apparatus equipped with an impact absorbing device according to the present embodiment, FIG. 2B is a side view showing a cut form, and FIG. 2C is a side view showing a welding form. FIG.
FIG. 3 is a perspective view of an impact absorbing device according to the present embodiment.
FIG. 4 is an explanatory diagram showing the operation of the shock absorber according to the present embodiment.
FIG. 5 is an explanatory diagram showing the operation of the shock absorber according to the present embodiment.
FIG. 6 is a time chart showing a change in the supporting force of the air cylinder of the shock absorber according to the present embodiment.
FIG. 7 is a block diagram of an entire conventional equipment line.
[Explanation of symbols]
84 Movable pass roller (roller)
86 Air cylinder (buffering means)
88 Swing arm (shaft support means)
98 Solenoid valve (pneumatic circuit)
100 Pressure regulator (pneumatic circuit)
104 Controller (Pneumatic circuit)

Claims (4)

In the impact absorbing device that absorbs the impact force acting on the web due to the fluctuation of the tension acting on the web traveling on the equipment line,
A roller for conveying the web;
Buffer means for supporting the roller in a movable and elastic manner;
A shock absorbing device comprising: 2. The shock absorbing means comprises a shaft supporting means for supporting the roller so as to be movable, and an air cylinder for generating a supporting force for elastically supporting the shaft supporting means. Shock absorber. 3. The impact absorbing device according to claim 2, further comprising a pneumatic circuit capable of switching a magnitude of a supporting force of the air cylinder. 4. The impact absorbing device according to claim 3, wherein the supporting force of the air cylinder is controlled as follows.
When cutting the preceding web and joining the subsequent web, releasing the support force and moving the roller from a fixed position to cause the web to sag;
After joining the webs, generating a supporting force, returning the roller to a fixed position, setting the supporting force 10% -20% higher than the pressure that the roller receives from the web during traveling, and removing the web slack;
Absorbing the impact force generated on the web as the web is loosened, and setting the roller so that the roller does not move with the pressure received from the web during travel after the roller returns to a fixed position;
Consists of.

Images