JPH0631676Y2 - Roller heat treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roller heat treatment apparatus used for heat treatment such as heat development and heat fixation of a curable sheet such as paper or film. It is about.

[Prior art and its problems]

A roller heat treatment device for performing heat treatment such as heat development and heat fixing on a sheet to be processed is a pair of a heat roller for heating the sheet to be processed and a backup roller for pressing the sheet to be processed on the heat roller. It has a roller. Then, the sheet to be treated is supplied between the rotating rollers and is heat-treated while moving in a pressure-bonded state to the heat roller. This backup roller is made of a material with a high elasticity, such as silicon rubber, so that the sheet to be processed can be pressed securely, and it is also called a soft roller.On the other hand, the heat roller does not conduct heat. In order to improve the quality, many aluminum pipes are coated with Teflon or the like, which is also referred to as a hard roller, and a tubular heater lamp such as a halogen bulb is arranged inside the hard roller along the axial direction.

By the way, in such a roller heat treatment apparatus, it is necessary to heat the sheet to be treated at a uniform temperature for a predetermined time. That is, it is necessary that the temperature distribution of the heat roller in the axial direction is uniform and that the sheet to be processed is pressed onto the heat roller for a predetermined time.

When the required heating time is relatively short, such as heat fixing of a PPC or a laser printer, a predetermined heating time can be secured only by heating between a pair of rollers. When performing a heat treatment that requires a relatively long heating time, such as in the case of developing paper, it is necessary to slow down the rotation speed of the roller, which causes a problem of low productivity. Therefore, it is conceivable to arrange a plurality of backup rollers around the heat roller. That is, if the sheet to be processed that moves in a curved manner is sequentially pressure-bonded to the heat roller by a plurality of backup rollers, the pressure-bonding time becomes longer, and a predetermined heating time can be secured without slowing the rotation speed. You can Here, when a single belt is wound and a plurality of backup rollers are driven to rotate the heat roller, there are variations in the outer diameter of each backup roller and the outer diameter of the sprocket on which the drive belt is hung. Therefore, the peripheral speed of each backup roller is not always uniform.
If the peripheral speed of the backup roller close to the supply side of the adjacent backup rollers is high, the speed at which the sheet to be processed is sent out by this backup roller becomes faster than the speed at which the backup roller at the discharge side is pulled in, and The treated sheet is loosened between the backup rollers and separated from the heat roller.
For this reason, not only the heat treatment becomes incomplete, but there is a problem that "wrinkles" are generated on the sheet to be treated.

[Purpose of device]

Therefore, an object of the present invention is to provide a roller heat treatment apparatus capable of surely performing heat treatment without slackening of a sheet to be treated between adjacent backup rollers.

[Constitution of the device and its action]

The structure of the present invention is a roller in which a curable sheet such as paper or film is supplied between a heat roller having a heater lamp inside and a backup roller which is pressed against the heat roller, and is heated and discharged. In the heat treatment apparatus, a plurality of the backup rollers are arranged, and the backup rollers have a peripheral speed which is gradually increased from the backup roller near the supply side of the sheet to be processed toward the backup roller near the discharge side. Is driven so that the sheet to be processed moves in a state where tension is applied.

That is, of the adjacent backup rollers, the peripheral speed of the backup roller closer to the supply side is slower, so the speed at which the sheet to be processed is fed out by this backup roller is faster than the speed at which it is drawn in by the backup roller on the discharge side. The sheet to be processed moves under tension. Therefore, the heat treatment is surely brought into close contact with the heat roller, and "wrinkles" do not occur.

〔Example〕

The present invention will be described in detail below based on the embodiments shown in the drawings.

The casing 1 of the roller heat treatment apparatus is provided with a supply port 11 to which a curable sheet (not shown) such as paper or film is supplied and a discharge port 12 to be discharged after the heat treatment. The heat roller 2 is rotatably arranged inside the casing 1. This heat roller 2 is made by coating the surface of an aluminum pipe with Teflon and has a rated power consumption of 1K along its axis.
A heater lamp 21 made of a W-shaped halogen bulb is arranged. Around the heat roller 2, four backup rollers 3a, 3b, 3c, 3d are rotatably arranged in order from the one close to the supply port 11. This backup roller 3a, 3b,
3c and 3d are made of silicon sponge and are highly elastic, and are in pressure contact with the heat roller 2. Therefore, the contact portion is deformed according to the curvature of the heat roller 2, and the contact area between the both is wide. Then, the sprockets 4a, 4b, 4c, 4d attached to one end of the respective shafts 31 of the backup rollers 3a, 3b, 3c, 3d, the idlers 81, 82 rotatably arranged, and the output shaft 61 of the motor 6.
An endless belt 5 is wound around the motor, and when the motor 6 rotates, the backup rollers 3a, 3b, 3c, 3d are driven to rotate in the direction of the arrow. Therefore, when the backup rollers 3a, 3b, 3c, 3d rotate, the heat roller 2 is driven to rotate. Here, although the outer diameters of the sprockets 4a, 4b, 4c, and 4d are small,
a <4b <4c <4d and backup rollers 3a, 3
The peripheral velocities of b, 3c and 3d are sequentially increased from the backup roller near the supply port 11 to the backup roller near the discharge port 12. Of the four backup rollers 3a, 3b, 3c, 3d, for example, the backup roller 3a is pressed against the heat roller 2 more strongly than the other backup rollers 3b, 3c, 3d, and the rotation speed of the heat roller 2 is It is regulated by the backup roller 3a. Since the surface of the heat roller 2 is very slippery, the other backup rollers 3b, 3c, 3d rotate while slipping slightly. Or sprocket
Backup rollers 3 and 4a, 4b, 4c and 4d have the same outer diameter.
The outer diameters of a, 3b, 3c and 3d may be 3a <3b <3c <3d.

Then, the heater lamp 21 is turned on, the motor 6 is rotated, the heat roller 2 is heated to a predetermined temperature, and the heat roller 2 and the backup rollers 3a, 3b, 3c, 3d are rotated, When the processing sheet is supplied from the supply port 11, the sheet to be processed is first pressure-bonded to the heat roller 2 by the backup roller 3a closest to the supply port 11, and is heat-treated while moving. Further, the sheet to be processed is bent and moved, and is sequentially pressure-bonded to the heat roller 2 by the backup rollers 3b, 3c, 3d adjacent to each other, and subjected to heat treatment. And
When the heat treatment is completed, the sheet to be treated is scraper 7
Is discharged from the outlet 12.

At this time, the peripheral velocities of the backup rollers 3a, 3b, 3c, 3d are from the backup roller located near the supply port 11 to the discharge port 12
Since the speed gradually increases toward the backup roller closer to, the speed at which the sheet to be processed is fed out by the backup roller closer to the supply side is faster than the speed at which the sheet to be processed is sent out by the backup roller closer to the supply side. Therefore, the sheet to be processed moves under tension and is always in close contact with the heat roller, so that the heat treatment is reliable and "wrinkles" do not occur.

[Effect of device]

As described above, the roller heat treatment device of the present invention is
The peripheral speeds of multiple backup rollers surrounding the heat roller are sequentially increased from the backup roller closer to the supply side to the backup roller closer to the discharge side. The sheet is not subjected to tension and is not loosened, and the heat treatment can be reliably performed.

[Brief description of drawings]

 The drawing is a cross-sectional view of an embodiment of the present invention. 1 ... Casing, 11 ... Supply port, 12 ... Discharge port 2 ... Heat roller, 21 ... Heater lamp 3a, 3b, 3c, 3d ... Backup roller 4a, 4b, 4c, 4d ... Sprocket 5 ... Belt, 6 ... Motor, 7 …scraper

Claims (1)

[Scope of utility model registration request] 1. A roller heating in which a curable sheet such as paper or film is supplied between a heat roller having a heater lamp inside and a backup roller in pressure contact with the heat roller, and is heated and discharged. In the processing apparatus, a plurality of the backup rollers are arranged, and the backup rollers have a peripheral speed that sequentially increases from the backup roller near the supply side of the sheet to be processed toward the backup roller near the discharge side. Is driven so that the sheet to be processed moves under tension.