JP2532649Y2 - Roller heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a heating process such as thermal development or thermal fixing of a curable sheet such as paper or film, which has a relatively long heating time. The present invention relates to a roller heat treatment apparatus that is used for processing and is heat-treated by conduction heat from a heat roller.

[Conventional technology and its problems]

There are two types of devices that perform heat processing such as thermal development and heat fixing on the sheet to be processed. One uses the radiant heat of the lamp and the other uses the conductive heat from the heat roller. The roller heating process uses the conductive heat from the heat roller. The apparatus has a pair of rollers, a heat roller for heating the sheet to be processed, and a backup roller for pressing the sheet to be processed against the heat roller. Then, the sheet to be processed is supplied between the two rotating rollers, and heat-treated while moving in a state of being pressed against the heat roller. This backup roller is made of an elastic material such as silicon rubber, and its surface is also called a soft roller so that the sheet to be processed can be pressed securely. On the other hand, the heat roller has heat conduction. In order to improve the quality, the surface of the aluminum pipe is often coated with Teflon, etc., also called a hard roller, and bearings are attached to both ends of the pipe so that it is freely rotatable. In addition, a tubular heater lamp such as a halogen bulb is arranged.

By the way, in such a roller heat treatment apparatus, it is necessary to heat the sheet to be processed at a uniform temperature for a predetermined time. That is, it is necessary that the temperature distribution in the axial direction of the heat roller is uniform and the sheet to be processed is pressed against the heat roller for a predetermined time. Of course, the structure of the device must be simple.

However, in many of the conventional roller heat treatment apparatuses, a drive mechanism including a belt and a gear is connected to one end of the heat roller, and when the heat roller is driven, the backup roller is often driven. For this reason, both ends of the heat roller have different structures and are asymmetrical, and the side to which the drive mechanism is connected easily transmits the drive mechanism to easily escape heat.
Therefore, there is a problem that the temperature distribution in the axial direction of the heat roller is not uniform, and variation easily occurs. Also, as described above, bearings are attached to both ends of the heat roller and are rotatably held.However, a heater lamp is arranged inside the heat roller, and the end protrudes from the end opening of the heat roller. I have. For this reason, the outer diameter of the part to which the bearing is attached becomes large, and it is necessary to use a large and heat-resistant bearing to transmit heat and escape, resulting in high cost and complicated structure Had become.

Next, like thermal fixing of PPC and laser printers,
When the required heating time is relatively short, a predetermined heating time can be secured only by heating between a pair of rollers, but for example, when a heat developing type diazo photosensitive paper is developed, a relatively long heating time is required. When performing heat treatment that requires heating time,
It is necessary to reduce the rotation speed of the roller, and there is a problem that productivity is reduced.

[Purpose of the invention]

Therefore, the present invention provides a roller heating apparatus having a simple structure, low cost, a long heat treatment time without slowing down the rotation speed of the roller, good productivity, and a small variation in the temperature distribution in the axial direction of the heat roller. It is an object to provide a processing device.

[Structure of the device and its operation]

According to the configuration of the present invention, a bendable sheet such as paper or film is heated by conduction heat from a heat roller between a heat roller having a heater lamp therein and a backup roller pressed against the heat roller. In the roller heat treatment apparatus, the heat roller is rotatably held only by three or more backup rollers surrounding the heat roller, and the sheet to be processed is pressed against the heat roller by all the backup rollers. Is characterized in that at least one of the rollers is driven to rotate each roller.

That is, since the heat roller is freely rotatably held by three or more backup rollers, there is no need to attach large bearings to both ends of the heat roller, and the device can be manufactured simply and at low cost. Since the backup roller is driven and the heat roller is driven, there is no need to connect a drive mechanism such as a belt to one end of the heat roller, and both ends can be made symmetrical. Therefore, the temperature distribution in the axial direction of the heat roller is also improved. Further, since three or more backup rollers are arranged, the sheet to be processed, which moves between the rollers, is sequentially pressed against the heat roller by all the backup rollers while being curved. Therefore, the pressing time to the heat roller becomes longer, and without decreasing the rotation speed,
A predetermined heating time can be secured.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

In FIG. 1, a casing 1 of a roller heat treatment apparatus is shown.
Is provided with a supply port 11 for supplying a curable sheet (not shown) such as paper or film, and a discharge port 12 for discharging after completion of the heat treatment. The heat roller 2 is arranged inside the casing 1 so as to be surrounded by the four backup rollers 3. Here, the angle between the center of the heat roller 2 and the center of two adjacent backup rollers 3 is 18
0 ° or less, so that the heat roller 2 does not move in the radial direction. Then, as shown in FIG.
A flange 33 is provided at the end of the backup roller 3, and the flange 33 covers the end surface of the heat roller 2, so that the heat roller 2 hardly moves in the thrust direction. That is, the heat roller 2 is rotatably held only by the four backup rollers 3.
The heat roller 2 is formed by coating a surface of an aluminum pipe with Teflon, and a heater lamp 21 composed of a tubular halogen bulb having a rated power consumption of 1 kW is disposed along an axis of the heat roller 2.

As shown in FIG. 2, a bearing 34 is attached to the shaft 32 of the backup roller 3 and is held so as to be freely rotatable. The backup roller 3 is made of silicon sponge and has high elasticity. For this reason, the contact portion with the heat roller 2 is deformed following the curvature of the heat roller 2, and the contact area between the two is increased. An endless belt 4 is wound around a sprocket 31 attached to a shaft 32 at one end of each of the three backup rollers 3, an idler 5 rotatably arranged, and an output shaft 61 of a motor 6. When the motor 6 rotates, the three backup rollers 3 are driven to rotate in the direction of the arrow. Therefore, when the three backup rollers 3 rotate, the remaining backup rollers 3 and the heat roller 2 rotate following the rotation. As described above, the belt 4 is not wound around the heat roller 2, and the structure of both ends of the heat roller 2 is equal and symmetric. When the interval between the adjacent backup rollers 3 is large, a plate-like conveyance regulating member (not shown) is provided along the heat roller 2 between the backup rollers 3 so that the leading end of the sheet to be processed is surely adjacent to the adjacent backup roller 3. It is good to be caught by. In FIGS. 1 and 2, some members are omitted for convenience of drawing.

Then, the heater lamp 21 is turned on, the motor 6 is rotated, the heat roller 2 is heated to a predetermined temperature,
When the sheet to be processed is supplied from the supply port 11 in a state where the sheets 2 and 3 are rotating, first, the sheet to be processed is pressure-bonded to the heat roller 2 by the backup roller 3 closest to the supply port 11, and is heated while moving. Is done. Further, the sheet to be processed moves in a curved manner, and is sequentially pressed against the heat roller 2 by the adjacent backup roller 3 and is heated. That is, the sheet to be processed is pressed against the heat roller 2 by all the backup rollers 3 and is heat-treated.
When the heating process is completed, the sheet to be processed is guided to the scraper 7 and discharged from the discharge port 12.

As described above, since the heat roller 2 is held by the backup roller 3 so as to be freely rotatable, there is no need to attach and hold a large bearing to the heat roller 2, so that the apparatus can have a simple structure and a low cost. .
In addition, since the structure of both ends of the heat roller 2 is equal and symmetrical, and one end is not connected to a driving means such as a belt for transferring heat and escaping, there is an advantage that the temperature distribution in the axial direction can be easily made uniform. Next, the sheet to be curved and moved is sequentially pressed against the heat roller 2 by four, that is, all the backup rollers 3, and heated, so that the sheet to be processed is rotated around the heat roller 2 at a wide angle. Touch the surface. Therefore, even when heat treatment for a relatively long time is required, there is no need to reduce the rotation speed of the rollers 2 and 3, and heat treatment can be performed with high productivity.

Note that the backup roller 3 is provided with
The invention is not limited to the book, and it is sufficient that at least three of the books are used. If at least one of the books is driven so that the heat roller 2 is driven, it is apparent that the object of the present invention can be achieved.

[Effect of the invention]

As described above, the roller heat treatment apparatus of the present invention has a structure in which the heat roller is freely rotatably held by only three or more backup rollers, and the heat roller is driven by driving the backup roller. Is simple, and even when a relatively long heat treatment is required, a long heat treatment time can be secured without slowing down the rotation speed of the roller, resulting in good productivity and a temperature distribution in the axial direction of the heat roller. Can be a roller heat treatment apparatus with less variation.

[Brief description of the drawings]

 1 and 2 are sectional views of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Casing, 11 ... Supply port, 12 ... Discharge port 2 ... Heat roller, 21 ... Heater lamp 3 ... Backup roller, 4 ... Belt 6 ... Motor, 7 ... Scraper

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-29822 (JP, A) JP-A-50-137145 (JP, A) JP-A-61-90177 (JP, A) 38544 (JP, A) JP-A-54-60934 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A bendable sheet such as paper or film is heated by conduction heat from a heat roller between a heat roller having a heater lamp therein and a backup roller pressed against the heat roller. In the roller heat treatment apparatus, the heat roller is rotatably held only by three or more backup rollers surrounding the heat roller, and the sheet to be processed is pressed against the heat roller by all the backup rollers, and the backup roller Wherein at least one of the rollers is driven to rotate each roller.