JP2000085955A - Conveying method of sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying method of a sheet material without making a scratch and without making a position fall into disorder at the time when a PS(polystyrene) plate transfers. SOLUTION: PS plates 30 are carried to the downstream by a C conveyor 32. Coveying speed of a CR conveyor 36 is made the same as the C conveyor 32 till head end parts of the PS plates 30 reach the CR conveyor 36. Thereafter, when the PS plate 30 transfers on to the CR conveyor 36 and a sensor Sl detects a rear end of the PS plate 30, the CR conveyor 36 is accelerated and its speed comes to be the same conveying speed as a decelerated CMl conveyor 38. Consequently, it is possible to prevent a flaw of the PS plates 30 and their positions from falling into disorder by making a conveying speed between the upstream and downstream conveyors the same at the time when the PS plates transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for conveying a sheet material such as a photosensitive lithographic printing plate.

[0002]

2. Description of the Related Art A photosensitive lithographic printing plate (hereinafter, referred to as a "PS plate") is generally a sheet-like or coil-like aluminum plate, which is subjected to surface treatment such as graining, anodic oxidation, and chemical conversion treatment alone or in an appropriate combination. Then, after applying and drying a photosensitive solution, it is manufactured by cutting into a desired size.

That is, the PS plate is continuously cut by a slitter to determine a trimming width (width size), and then cut by a flying shear disposed downstream of the slitter to obtain a PS plate length. The size (length in the transport direction) is determined.

[0004] In this way, the PS plate cut by the flying shear is transferred to a stacking section by transiting a plurality of conveyors, stacked in a predetermined number, and then packed and shipped.

[0005] In the cutting line, the transport speed of the downstream conveyor is gradually increased from the upstream transport speed so that the PS plate reaches the collecting section at predetermined intervals.

[0006] However, if there is a speed difference between the conveyors, abrasion may occur when the PS plate is transferred, or the posture may be lost (meaning after the transfer), and the PS plate may not be properly collected at the collecting section. There is.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a method of conveying a sheet material in which a scratch is not generated and a posture is not lost when a PS plate moves. And

[0008]

According to the first aspect of the present invention, a sheet material transits a plurality of conveyors and is conveyed to a predetermined place.

That is, in the first step, a speed difference between the transport speed of the first conveyor and the transport speed of the downstream second conveyor is set within a predetermined range. Therefore, when the sheet material is transferred from the first conveyor to the second conveyor in the second step, no abrasion is generated on the sheet material, and the posture is not lost after the transfer.

Further, when the sheet material is transferred to the second conveyor, the transport speed of the second conveyor is accelerated and the third conveyor on the downstream side is accelerated.
The speed difference from the conveyor speed is within a predetermined range.
Therefore, in the third step, when the sheet material transfers from the second conveyor to the third conveyor, no abrasion occurs on the sheet material.

Next, when the sheet material is transferred to the third conveyor, the conveying speed of the second conveyor is reduced, the speed difference from the conveying speed of the first conveyor is within a predetermined range, and the next sheet material is awaited. Becomes

As described above, when the sheet material moves,
By setting the conveyance speed difference between the upstream and downstream conveyors within a predetermined range, the sheet material can be prevented from being damaged. this is,
The utility becomes remarkable when it is not easy to change the length of the line or the number of conveyors, and when there is a large difference in transport speed between the conveyors.

According to the second aspect of the present invention, the range of the speed difference is determined according to the characteristics of the belt material and the sheet material of the conveyor.

That is, it is desirable that the speed difference is zero. However, attention is paid to the fact that the occurrence of scratches on the sheet material is affected by the properties of the belt material and the sheet material. The limit value is obtained experimentally, and the range of the speed difference has a margin. Thereby, the control mechanism of the transport speed can be simplified.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. (Outline of Cutting Line) As shown in FIG. 1, a feeder 14 for sending out a roll-shaped web 12 is located upstream of a cutting line in which a slitter 10 (cutting device) according to the present embodiment is disposed.
Are arranged. The web 12 sent from the feeder 14 is overlapped with a charged interleaf sheet 18 at a feed roller 16, and reaches a notcher 20.

The notcher 20 punches out the edge or center of the web 12 and cuts the upper trimming blade 22 of the slitter 10.
And the trimming lower blade 24 moves the web 12 at the punching position.
To be able to move in the width direction. Thereby, the trimming width (width size) of the web 12 can be changed while continuously cutting (cutting the slip sheet and the web). Also,
If necessary, the hollow blade 50 hollows out the central portion of the web 12 to form a double web.

In this way, the length of the web 12 having a predetermined trimming width is detected by the length measuring device 26,
The flying shear 28 cuts the web 12 in the instructed cut cycle, and manufactures a PS plate 30 of a set size.

Next, the PS plate 30 includes a C conveyor 32 and a C
The R conveyor 36, the CM1 conveyor 38, the CM2 conveyor 40, and the CM3 conveyor 42 are transited and sent to the stacking unit 34. After a predetermined number of sheets are stacked, they are packed in cardboard or the like and shipped. (Configuration of Transport Line) In the present embodiment, as an example, the line speed (the speed from the upstream of the web to the flying shear 28) is set to 20 m / min.
It is configured to be accelerated to a speed of m / min to stack the PS plates 30.

As shown in FIGS. 2 and 3, the PS plate 30 cut by the flying shear 28 moves onto the C conveyor 32 at a speed of 20 m / min. Here, C conveyor 32
Is set to 20 m / min, and the PS plate 3
No abrasion occurs on 0.

Then, the PS plate 30 is transported downstream by the C conveyor 32. Here, before the leading end of the PS plate 30 reaches the CR conveyor 36 (after being cut by the flying shear 28), the PS plate 30 is moved to the CR conveyor 3.
6 is calculated from the length of the C conveyor 32, the transport speed of the C conveyor 32, and the length of the PS plate 30), and the CR conveyor 36 is reduced from 40 m / min to 20 m / min. It is in low-speed mode.

Next, when the PS plate 30 moves onto the CR conveyor 36 and the sensor S1 detects the rear end of the PS plate 30,
The CR conveyor 36 accelerates to a speed of 40 m / min. The tip of the PS plate 30 is the CM1 conveyor 3
8 (PS version 30 is CM1 conveyor 38
The time immediately before the transfer is calculated from the length of the CR conveyor 36, the transport speed and acceleration of the CR conveyor 36, and the length of the PS plate 30), and the CM1 conveyor 38 is decelerated from 60 m / min to 40 m / min. Is in the low-speed mode.

Next, when the PS plate 30 moves onto the CM1 conveyor 38 and the sensor S2 detects the rear end of the PS plate 30, the CM1 conveyor 38 accelerates to reach a speed of 60 m / min. The time until the leading end of the PS plate 30 reaches the CM2 conveyor 40 (the time immediately before the PS plate 30 is transferred to the CM2 conveyor 40 is the CM1 conveyor 38).
, The transport speed and acceleration of the CM1 conveyor 38, and the length of the PS plate 30), and the CM2 conveyor 40 is decelerated from 80 m / min to 60 m / min, and is in the low-speed mode.

Next, when the PS plate 30 moves onto the CM2 conveyor 40 and the sensor S3 detects the rear end of the PS plate 30, the CM2 conveyor 40 accelerates to reach a speed of 80 m / min. Then, the PS plate 30 is transferred to the CM3 conveyor 42 having a constant conveying speed of 80 m / min, and reaches the stacking unit 34.

In order to make the explanation easy to understand, the PS version 3
0, but the CR conveyor 36, CM
The 1 conveyor 38 and the CM2 conveyor 40 include a sensor S1,
When the rear end of the PS plate 30 is detected in S2 and S3, FIG.
As shown in the timing chart of FIG. 7, the vehicle is decelerated, and waits in the low-speed mode until the next PS plate 30 moves.

Thus, by setting the conveyor speed difference to zero, the PS plate 30 can be conveyed to the collecting section 34 without scratching.

In this embodiment, the conveying method in which the speed difference of the conveyor is zero has been described. However, in practice, the speed difference may be set to an allowable range which does not cause abrasion without making the speed difference zero. The allowable range of the speed difference is affected by the material of the PS plate, the degree of curling of the PS plate, the material of the conveyor belt, and the like.

For example, the C conveyor 32 and the CR conveyor 3
When the material of the belt No. 6 is “Clarino” (a product of Popal Kogyo Co., Ltd.), the allowable range of the speed difference is 12 m /
When it is less than minutes, there is no meandering and no scratches.

Material: PU-12A (product of Nitta Corporation) for CM1 conveyor 38 to CM3 conveyor 42
In order to avoid scratches, the allowable range of the speed difference needs to be 2 m / min or less.

In this embodiment, the PS is controlled by five conveyors.
Although the method of transporting the plates 30 has been described, it is a matter of course that the present invention is not limited to this number.

[0030]

According to the present invention having the above-described structure, the sheet material does not suffer from abrasion and does not lose its posture after being transferred.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a cutting line employing a transport direction according to the present embodiment.

FIG. 2 is an explanatory diagram illustrating a transport method according to the embodiment.

FIG. 3 is a timing chart illustrating a transport method according to the embodiment.

[Explanation of symbols]

 30 PS plate (sheet material) 36 CR conveyor (first conveyor) 38 CM1 conveyor (second conveyor) 40 CM2 conveyor (third conveyor)

Claims (2)

[Claims] 1. A method for conveying a sheet material in which the sheet material transits a plurality of conveyors and is conveyed to a predetermined location, wherein the speed difference between the conveying speed of the first conveyor and the conveying speed of the downstream second conveyor is set to a predetermined range. After the sheet material has been transferred from the first conveyor to the second conveyor, the transfer speed of the second conveyor is increased, and the speed difference between the transfer speed of the third conveyor on the downstream side is determined. A second step of setting the sheet material to be within a predetermined range, and after the sheet material has moved from the second conveyor to a third conveyor on the downstream side, the conveying speed of the second conveyor is reduced to the speed of the conveying speed of the first conveyor. A third step of setting the difference to be within a predetermined range. 2. The method according to claim 1, wherein the range of the speed difference is determined in accordance with a belt material of the conveyor and characteristics of the sheet material.