JPS636764A - Heat roll - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a heat roll used in copying machines and the like.

"Prior Art" Heat rolls are used in copying machines, printing machines, and various other applications, and are required to have uniform temperature distribution characteristics. Therefore, various types have been used in the past.

``Problems to be Solved by the Invention'' However, the temperature distribution characteristics of a heat roll, for example, as shown in Figure 13, when the temperature of the roll is measured after being heated while being removed from a copying machine, etc., the temperature of the entire roll is Approximately 20
Even at temperatures around 0°C, when measuring the temperature characteristics during operation when mounted on a device such as a copying machine, we find that the temperature characteristics of bearings rotatably supported at both ends of the shaft integrated with the roll and other parts attached to the roll shaft are measured. There is a problem in that heat is radiated from the attached accessories, etc., and the temperature at the end of the heat roll drops to about 182° C., making it impossible to obtain uniform temperature distribution characteristics.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and includes a method of fixing a large-diameter roll tube to a shaft and storing and sealing a heat medium in a storage chamber formed inside the tube. and attaching a helical portion to the shaft;
A configuration in which a heat source is provided inside or outside the tube and the heat medium is circulated by rotating the shaft is used as a means to solve the above problems.

"Function" A spiral section is provided in one of the two-layered flow passages provided inside the roll tube, and a heat medium is accommodated therein, and the heat medium accommodated in the roll tube is directly or indirectly heated while The roll tube can be heated to a uniform temperature by rotating the shaft integrated with the roller and circulating the heat medium.

"Example" Example of the present invention will be described based on FIGS. 1 to 3.
is a hollow shaft having a bottomed portion 2 at one end and an opening 3 at the other end, and a rod-shaped heater 4 is inserted into the shaft through the opening 3.

A large diameter roll tube 5 is fixed concentrically to the outer periphery of the shaft 1 by means of side plates 6.6 installed at both ends of the shaft 1.

A storage chamber 7 is formed in the roll tube 5 and stores a liquid heat medium (eg, oil, water, etc.) suitable for the roll operating temperature.

Between the shaft 1 and the roll tube 5, two intermediate cylinders 1) and 12 are pivoted, located on the left and right sides from the center of the storage chamber 7, so that the storage chamber 7 is concentrically formed into two layers. Two internal passages 13, 14 are formed between the shaft 1 and the intermediate cylinders 1) and 12, respectively. The intermediate cylinder 1). 12 and the roll tube 5 form two outer passages 15 and 16, respectively, and the inner passage 13.1.
4 is provided with a helical portion 8.9, each inner passageway being formed in an opposite helical shape.

The second embodiment will be described based on FIG. 4.5. A large diameter roll pipe 5 is fixed concentrically to the outer periphery of a shaft 1 located at the center, and is arranged at intervals within the roll pipe 5. two intermediate cylinders 1
). 12 concentrically connects the inner passage 23.24 and the outer passage 2
5.26 respectively. Intermediate cylinder 1). 12 and the roll tube 5, two spiral portions 28, 29 are attached symmetrically from the center to form an outer passage 25, 26 in a spiral shape.

Next, to explain the operation of this embodiment, when the roll tube 5, which is heated by energizing the heater 4, is rotated in the direction of the arrow X in FIG. The heating medium is moved along the helical part and forced to move from the center of the shaft l in the direction of both ends in the spirally formed inner passage 13, 14, while the heat medium is rapidly heated by the heater 4 through the shaft l. heated to.

The heat medium moving in the inner passages 13 and 14 while being heated from the central portion of the roll tube 5 toward both ends moves radially along the side plates 6 at both end portions of the roll tube 5 and moves inside the roll tube 5. After moving toward the surface, it passes through the outer channel 15.16, joins in the central part of the roll tube, moves centrally towards the center where the shaft 1 is located, and flows again into the inner channel 13.14. In this way, the surface temperature of the roll tube 5 is maintained uniformly through the heat medium heated by the heater 4 without circulating through the inner and outer passages.

Inner path 13°1 in the roll tube 5 from the center to both ends
The hot heat medium heated while moving through the roll tube 4 first heats both ends of the roll tube 5 and then moves along the inner surface of the roll tube 5 through the outer passage 15,16.
The central surface portion of the roll tube 5 is heated, while the surface portion of the roll tube 5 is heated as the intermediate tube 1). Since the heating medium is isolated from the shaft l containing the heater 4 by the heating medium 12, the temperature of the heating medium decreases slightly while moving through the outer passage 15, 16. Therefore, as shown in FIG. 12, the surface temperature distribution of the roll tube 5 is, for example, when the temperature at the center is set to about 200°C, the temperature at both ends slightly rises to about 203°C. However, if the rotational speed of the rolled tube 5 is increased or the number of turns of the spiral portion 8°9 or 28.29 is decreased, the flow rate of the heat medium from the central portion of the rolled tube toward both ends can be increased. This makes it possible to make the heat medium temperature uniform.

In order to force the heat medium in the roll tube 5 to form a VB ring, the first step is to
．． As shown in Figure 2, the spiral portion 8
．． 9 from the central part symmetrically, or the spiral part 28 can be attached to the outer passage 25° 26 as shown in Fig. 4.5.
．． 29 may be provided.

In this embodiment, the heater 4 and the shaft 1 are brought into close contact with each other and are rotated together, but the heater 4! , lIl may be provided, and only the shaft 1 may be rotated by providing a gap (not shown) between them. Moreover, the spiral part 32 for moving the heat medium in the accommodation chamber 7 by rotating the shaft 1 has a groove integrally formed from the outside to the inside of the cylindrical body 31 (FIG. 6). The helical passage 33 may be formed by attaching it to the outer periphery of the shaft 1.

Furthermore, it is also possible to form a spiral passage 36 by winding and attaching a U-shaped channel member 35 shown in FIG. 8 in a spiral manner around the outer periphery of the shaft 1.

The intermediate cylinder does not necessarily have to be cylindrical, and although the heat source in this embodiment uses a heater housed within the shaft, it is possible to heat the heat medium inside the roll tube with a heat source installed outside the roll tube. By rotating the shaft, the heating medium may be forced to circulate through the spiral portion to uniformly heat the roll tube.

The heat roll of the present application may be of a double-sided type (FIG. 10) or a cantilever type (FIG. 1).

"Effects of the Invention" The present invention forms two-layer passages in a roll tube, provides a spiral portion in one of the passages, and heats a heat medium sealed in a storage chamber in the roll tube with a heat source. By rotating the tube, the heat medium can be circulated throughout the roll tube, thereby making it possible to equalize the temperature distribution throughout the roll tube.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall vertical sectional view, FIG. 2 is a vertical sectional side view showing the circulation direction of the heat medium in the inner and outer passages, and FIG. 3 is the same as that shown in FIG. 1. - An enlarged sectional view in the direction of the A line, FIG. 4 is a longitudinal sectional view of the entire second embodiment, FIG. 5 is a longitudinal sectional view showing the circulation direction of the heat medium in the inner and outer passages, and FIG. A cross-sectional view of the spiral cylinder in the example, FIG.
Fig. 8 is a perspective view of the U-shaped channel material, Fig. 9 is a sectional view of state iB in which the U-shaped channel material of Fig. 8 is wound around the shaft, Fig. 10 Figure 1) is a front view showing a double-sided heat roll support part, Figure 1) is a front view showing a cantilever type heat roll support part, and Figure 12 is a temperature distribution diagram during mounting operation of the heat roll according to the present invention. FIG. 13 is a temperature distribution diagram of a conventional heat roll during mounting operation. 1... Shaft, 5... Roll tube, 7... Accommodation chamber, 13°14.23.24... Inner passage, 15.16.25°2
6...Outer passage, 8.9.28.29...Spiral part.

Claims (4)

[Claims] (1) A large-diameter roll tube is fixed to a shaft, a heat medium is housed and sealed in a storage chamber formed inside, a spiral portion is attached to the shaft, and a heat source is provided inside or outside the roll tube; A heat roll characterized in that the temperature of the roll tube is made uniform by circulating a heat medium by rotating the shaft. (2) A large-diameter roll tube is fixed to a shaft to form a storage chamber therein, a liquid heat medium is hermetically contained in the storage chamber, and a two-layer flow path is formed inside and outside the roll tube; At least one spiral portion is provided in one of the flow paths, a heat source is provided outside or inside the roll tube, and the heat medium is circulated along the flow path by rotating the roll tube. 2. The heat roll according to claim 1, wherein the heat roll has a uniform temperature distribution. (3) A spiral portion is disposed in the axial direction from a required portion within the roll pipe, and the spiral directions of the spiral portions are arranged in opposite directions. heat roll. (4) The heat roll according to any one of claims 1 to 3, wherein the heat medium is injected into the roll tube, the inside of the roll tube is evacuated, and then the roll tube is hermetically sealed. .