JP2001348148A - Method and device for controlling carriage of polymeric web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry a polymeric web in good conditions in response to the expansion of the polymeric web due to a temperature change. SOLUTION: This device comprises a heating mechanism 24 for heating a photographic material web 14 to a desired temperature, a temperature detecting mechanism 26 for detecting the surface temperature of the heated photographic material web 14 on line, an expansion operating circuit 28 for operating the expansion amount of the photographic material web 14, and a speed ratio changing circuit 30 for changing the carrying conditions of the photographic material web 14 in accordance with the operated expansion amount of the photographic material web 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling the transfer of a polymer web for heating the polymer web to a desired temperature and for transferring the polymer web.

[0002]

2. Description of the Related Art In general, a recording medium such as a photographic light-sensitive material having a polymer support is often used in a roll state due to a demand for handling workability and the like. For example, a recording medium web (polymer web) is rewound from a recording medium wound in a roll shape (hereinafter referred to as a roll-shaped recording medium), and the recording medium web is cut into predetermined lengths to form a sheet-shaped recording medium. Work for forming a medium is widely performed.

[0003] By the way, this kind of roll-shaped recording medium is liable to be given a curl (hereinafter, referred to as curl) due to deformation over time or the like in a roll state, and has a sheet-like shape after a recording medium processing step such as cutting. The curl may remain on the recording medium. As a result, there is a problem that the transportability and the stackability of the sheet-shaped recording medium are significantly deteriorated.

Therefore, various proposals have been made to remove this kind of curl.
Japanese Patent Application Publication No. 653 discloses a method for properly correcting the curl of a recording medium such as a photographic photosensitive material by changing heating conditions according to the material of the support.

[0005]

By the way, the polymer support constituting the recording medium has a very large change in Young's modulus with temperature. For this reason, the recording medium itself is likely to expand and contract, and the recording medium is transported in a state in which a predetermined tension is applied. Due to this, there is a concern that the recording medium may be damaged and quality may be degraded.

At that time, for example, Japanese Patent Application Laid-Open No. 9-226998
According to the publication, as the winding of a winding material (for example, a recording medium) progresses, the advance speed is dynamically determined by a value calculated based on the winding tension, cross-sectional area, Young's modulus, and line speed of the material. Is known. Thereby, regardless of the material,
It is stated that over-tension at the time when the tip is wound around the reel is prevented, and stable winding control without drawing or breakage becomes possible.

[0007] However, in the above-mentioned prior art, in order to change the advancing speed of the material with high accuracy, the tension of the material must be measured on-line. For this reason,
It has been pointed out that the configuration and control are considerably complicated.

The present invention is intended to solve this kind of problem, and does not cause damage or the like to the heated polymer web, and enables high-speed transport of the polymer web smoothly and efficiently. It is an object of the present invention to provide a method and an apparatus for controlling transport of a molecular web.

[0009]

According to the method and apparatus for controlling the transport of a polymer web according to the present invention, the surface temperature of the heated polymer web is detected online, and based on this surface temperature, the polymer web is controlled. After the expansion / contraction amount is calculated,
The transfer condition of the polymer web is changed based on the amount of expansion and contraction. Accordingly, even if the polymer web expands and contracts greatly due to heating, the transfer conditions of the polymer web are changed in accordance with the amount of expansion and contraction, so that the polymer web may be over-tensioned or loose. Therefore, the polymer web can be transported with high precision and smoothness.

The relative speed (speed ratio) of the motor for the heating roller for heating the polymer web is changed with respect to the speed of the main feed motor for transporting the polymer web at a predetermined speed. Thereby, the transfer condition of the polymer web is changed. The speed of the main feed motor is usually set to be higher than the speed of the heating roller motor, and the polymer web is conveyed (over-feeded) while applying a certain tension.

Therefore, when the length of the polymer web changes according to the temperature, the amount of expansion and contraction of the polymer web is calculated, and the relative speed between the main feed motor and the heating roller motor is changed. As a result, even if the so-called overfeed ratio changes and the length of the polymer web greatly changes, the polymer web does not slip due to a difference in peripheral speed. Therefore, the polymer web is not damaged, and the transport of the polymer web can be efficiently controlled while the quality of the polymer web is reliably maintained.

[0012]

FIG. 1 is a schematic diagram illustrating the configuration of a recording medium processing system 12 in which a polymer web transport control device 10 according to an embodiment of the present invention is incorporated.

The recording medium processing system 12 includes a recording medium web having a polymer support, for example, a roll-shaped photosensitive material 1 on which a photosensitive material web (polymer web) 14 is wound.
6, a web delivery unit 18 for delivering the photosensitive material web 14 from the roll-shaped photosensitive material 16, a main feed suction drum 20 for delivering the photosensitive material web 14 from the web delivery unit 18 at a constant speed, A transport control device 10 according to the present embodiment is provided, and a plurality of guide rollers 22 are disposed between the web delivery unit 18 and the suction drum 20.

The transport control device 10 includes a photosensitive material web 14
A heating mechanism 24 for heating the photosensitive material web 14 to a desired temperature, a temperature detecting mechanism 26 for detecting the surface temperature of the heated photosensitive material web 14 online, and a temperature detecting mechanism 26 based on the detected surface temperature of the photosensitive material web 14. Expansion / contraction calculating circuit (expansion / contraction calculating mechanism) 28 for calculating the expansion / contraction of the photosensitive material web 14
And a speed ratio conversion circuit (transport condition setting mechanism) 30 for changing the transport condition of the photosensitive material web 14 based on the calculated amount of expansion and contraction of the photosensitive material web 14.

A heating mechanism 24 heats the photosensitive material web 14 by induction heating, wraps the photosensitive material web 14 around the heating roller 32, and heats the photosensitive material web 14. Roller 34 whose wrap angle with respect to the peripheral surface of the roller can be changed
And

The heating roller 32 is a belt pulley means 3
6, the suction drum 20 is connected to the first servomotor 38 via the belt / pulley means 4.
0 is connected to the second servo motor 42. The first and second servo motors 38 and 42 are drive-controlled via first and second servo controllers 44 and 46.

A cooling zone 48 is provided on the downstream side of the heating roller 32, and, for example, a cooling air is jetted on both surfaces of the photosensitive material web 14 heated by the heating roller 32 and subjected to the curl removal processing. Then, the photosensitive material web 14 is subjected to a cooling process. On the downstream side of the cooling zone 48, radiation thermometers 50a,
No. 0b is arranged opposite to both surfaces of the photosensitive material web 14.

The temperature signals detected by the radiation thermometers 50a and 50b are sent to the sequencer 52 as analog signals, and the digital signals converted by the sequencer 52 are sent to the expansion / contraction calculating circuit 28. As shown in FIG. 2, the expansion / contraction calculating circuit 28 stores a conversion graph of the surface temperature (web temperature) of the photosensitive material web 14 and the elongation amount (web elongation amount) of the photosensitive material web 14. The speed ratio conversion circuit 30 receives a speed ratio conversion coefficient corresponding to the web elongation calculated by the expansion / contraction amount calculation circuit 28. The speed ratio conversion circuit 30 includes a second servo controller 4
6, a speed signal of the suction drum 20 is input, and a first signal calculated from the speed signal and the speed ratio conversion coefficient is used.
The conversion speed of the servo motor 38 is sent to the first servo controller 44.

The operation of the transport control device 10 configured as described above will be described below in relation to the transport control method according to the present embodiment.

First, based on the type (material, thickness, etc.) of the roll-shaped photosensitive material 16, the heating temperature of the heating roller 32 corresponding to the type of the roll-shaped photosensitive material 16 to be loaded into the web delivery section 18 is determined. Is done. When the heating roller 32 is heated to a predetermined heating temperature, the heating time of the photosensitive material web 14 is determined, and the lap angle of the swing roller 34 is set according to the heating time.

For this reason, the photosensitive material web 14 held on the outer periphery of the swing roller 34 is wrapped around the peripheral surface of the heating roller 32 at a predetermined wrap angle, and the photosensitive material web 14 is rotated by the rotation of the suction drum 20. Is fed out of the roll-shaped photosensitive material 16. Suction drum 2
Numeral 0 indicates that the photosensitive material web 14 is rotated at a constant line speed from the web delivery unit 18 under the rotation of the second servomotor 42 via the second servo controller 46, and the heating mechanism 24 Transported to

In the heating mechanism 24, the heating roller 32 is rotated by a first servomotor 44 under the action of a first servomotor 38. At this time, the rotation speed of the heating roller 32 is synchronously driven with the rotation speed set to be lower than the rotation speed of the suction drum 20 by a fixed speed, and the photosensitive material web 14 is in a state where a predetermined tension is applied. At a constant speed via the suction drum 20.

The photosensitive material web 14, which has been subjected to the curl removing process by the heating mechanism 24, is cooled by cooling air on both sides thereof when passing through a cooling zone 48, and then conveyed to the temperature detecting mechanism 26. You. Temperature detection mechanism 26
In the figure, radiation thermometers 50a and 50b are arranged opposite to both surfaces of the photosensitive material web 14, and the radiation thermometers 50a and 50b are arranged.
a and 50b detect both surface temperatures of the photosensitive material web 14, and the detection signals are converted into analog signals by the sequencer 5a.
Sent to 2.

The sequencer 52 performs A / D conversion, converts both surface temperatures of the photosensitive material web 14 into digital signals, and sends the digital signals to the expansion / contraction calculating circuit 28. In the expansion / contraction amount calculation circuit 28, as shown in FIG. 2, the relationship between the web temperature and the web elongation amount is stored as a conversion graph, and based on the surface temperature signal input from the sequencer 52,
The amount of elongation of the photosensitive material web 14 is calculated. Further, the expansion / contraction amount calculating circuit 28 calculates the first servomotor 38 and the second servomotor 42 based on the calculated web expansion amount.
Is calculated, and the speed ratio conversion coefficient is sent to the speed ratio conversion circuit 30.

The speed ratio conversion circuit 30 receives a rotation speed signal of the second servomotor 42, and changes the speed ratio (relative speed) of the first servomotor 38 to this speed signal based on the above speed ratio conversion coefficient. Is done. Then, the converted speed command is input to the first servo controller 44.
Therefore, the rotation speed of the first servo motor 38 is changed via the first servo controller 44, and the rotation speed of the heating roller 32 is changed according to the amount of elongation of the photosensitive material web 14.

As described above, in this embodiment, after the photosensitive material web 14 is subjected to the curl removal processing under the action of the heating mechanism 24, the surface temperature of the photosensitive material web 14 constitutes the temperature detecting mechanism 26. It is measured online via the radiation thermometers 50a, 50b. Next, based on the surface temperature of the photosensitive material web 14, the photosensitive material web 1
4 is calculated, and the speed of the first servo motor 38 is reduced to the second speed based on the calculated web expansion amount.
The speed ratio is changed to a predetermined speed ratio with respect to the reference speed of the servo motor 42, and the rotation of the heating roller 32 is controlled.

As a result, the photosensitive material web 14 is separated from the suction drum 20 as the main feeder and the heating roller 3.
2 while maintaining a desired tension between the suction drum 20 and the heating roller 32 when the material is greatly expanded and contracted by a change in surface temperature.
And the speed ratio is sequentially changed.
Reference numeral 4 does not cause slippage on the peripheral surface of the heating roller 32 due to a difference in peripheral speed. Therefore, the photosensitive material web 14 can always be transported in a good state, and the desired quality can be reliably maintained without causing any damage due to slippage.

In particular, the photosensitive material web 14 is provided with a polymer support, and the Young's modulus of the polymer support is liable to change extremely greatly due to a temperature change. Therefore, in the present embodiment, as shown in FIG. 3, a change in the Young's modulus due to the web temperature is calculated as the web elongation, and a conversion graph of the web temperature and the web elongation is created in advance (see FIG. 2). This conversion graph is stored in the expansion / contraction amount calculation circuit 28.

Therefore, in the present embodiment, even if the photosensitive material web 14 expands and contracts significantly due to a temperature change, the speed control of the first servomotor 38 is performed only by controlling the speed of the first servo motor 38 according to the change in the amount of expansion and contraction. The transport of the photosensitive material web 14 can be controlled efficiently. Moreover, in the present embodiment, there is an advantage that the configuration and control of the entire transport control device 10 are effectively simplified and economical.

In this embodiment, the heating mechanism 24 includes the heating roller 32 and the swing roller 34.
However, the present invention is not limited to this.
For example, various configurations such as supplying hot air while conveying a belt can be applied.

Although the temperature detecting mechanism 26 has the analog radiation thermometers 50a and 50b, it is also possible to use a digital radiation thermometer, a contact-type temperature detector, or the like.

[0032]

According to the method and the apparatus for controlling transfer of a polymer web according to the present invention, the surface temperature of the heated polymer web is detected online, and the amount of expansion and contraction of the polymer web is calculated based on the surface temperature. Therefore, the conditions for transporting the polymer web can be set well, and it is possible to reliably prevent the damage and poor transport of the polymer web from occurring. Moreover, it is only necessary to detect the surface temperature of the polymer web, and the configuration and control are effectively simplified.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view of a recording medium processing system in which a polymer web transport control device according to an embodiment of the present invention is incorporated.

FIG. 2 is an explanatory diagram of a conversion graph stored in an expansion / contraction amount calculation circuit included in the transport control device.

FIG. 3 is an explanatory diagram showing a relationship among a web temperature, a Young's modulus, and a web elongation when creating the conversion graph.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Conveyance control apparatus 12 ... Recording medium processing system 14 ... Photosensitive material web 16 ... Roll photosensitive material 18 ... Web delivery part 20 ... Suction drum 24 ... Heating mechanism 26 ... Temperature detecting mechanism 28 ... Extension / contraction amount calculating circuit 30 ... Speed ratio Conversion circuit 32 Heating roller 34 Swing roller 38, 42 Servo motor 44, 46 Servo controller 48 Cooling zone 50a, 50b Radiation thermometer 52 Sequencer

Claims (4)

[Claims] 1. A method for controlling the transport of a polymer web for heating the polymer web to a desired temperature and transporting the polymer web, comprising: controlling the surface temperature of the heated polymer web online. Detecting; calculating the amount of expansion and contraction of the polymer web based on the detected surface temperature of the polymer web; and calculating the amount of expansion and contraction of the polymer web based on the calculated amount of expansion and contraction of the polymer web. Changing the transfer condition of the polymer web, and controlling the transfer of the polymer web. 2. The transfer control method according to claim 1, wherein the change of the transfer condition of the polymer web is performed with respect to the speed of a main feed motor for transferring the polymer web at a predetermined speed. A method for controlling the transport of a polymer web, wherein the method is performed by changing a relative speed of a motor for a heating roller for heating a molecular web. 3. A polymer web transport controller for heating a polymer web to a desired temperature and transporting the polymer web, wherein the heating mechanism heats the polymer web to a desired temperature. A temperature detecting mechanism for online detecting the surface temperature of the heated polymer web; and a stretching amount calculating mechanism for calculating the stretching amount of the polymer web based on the detected surface temperature of the polymer web. And a transfer condition setting mechanism for changing a transfer condition of the polymer web based on the calculated amount of expansion and contraction of the polymer web. 4. The transfer control device according to claim 3, wherein the heating mechanism includes a heating roller for heating the polymer web, and a heating roller motor for rotating the heating roller at a predetermined rotation speed. Wherein the transport condition setting mechanism changes a relative speed of the heating roller motor with respect to a speed of a main feed motor for transporting the polymer web at a predetermined speed. Transport control device for molecular web.