JPS58169168A - Heating roll - Google Patents

Abstract

PURPOSE:To provide a heating roll small in power consumption and short in temp. rise time, by providing a heat pipe in the inside of the heating roll, and arranging the heat source of the heat pipe at the position for bearing the heating roll. CONSTITUTION:A heating roll 1 is cylindrical, and when it is used for the heating roll fixing device of a copying machine, another pressure roll is pressed into contact with this roll. A heat pipe 3 is arranged in the inside of the roll 1, the side of the bearing part 2 is an evaporation part 4 and the middle of the roll 1 is a condenser part 5. The position of the condenser part 5 is located so as to uniformly heat the roll 1. When power is supplied to a band heater 13, a shaft neck 10 is heated through a bearing housing 12, the heat is propagated through the bearing part 2 by thermal conductivity to the end 2' of the cylinder, the evaporation part 4 is heated through the metallic cylinder 6, and its end is also heated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat roll for fixing a pressurized object such as an electronic copying machine under heat and pressure.

Conventionally, a fixing device using a heat fixing roller of an electronic copying machine carries the unfixed ii* after the image forming process of the copying machine, and the paper separated from the photosensitive drum is heated and transferred by a heating roll and a pressure roll that is in pressure contact with the heating roll. Pressure is applied to fix the image on the paper. A heat roll is used for this heating roll.

The heat roll has a heat source such as a halogen heater in the center, and a hollow roller rotates around the heat source, and unfixed toner on the paper is heated and fused through the roller heated by the halogen heater.

However, with the conventional heat fixing method using a heat roll... l It takes a long time for the surface of the fixing roll to warm up.

2. To shorten the time, it is necessary to increase the heater capacity.

3. Increasing the heater capacity will increase power consumption.

Even The larger the diameter of the fixing roll, the worse the thermal efficiency becomes.

It has the following disadvantages.

The object of the present invention is to provide a heat roll that has less front consumption and a shorter temperature rise time.

In the present invention, the heating roll is a cylindrical heat pipe covered with Teflon, the heat pipe is supported by a shaft on the side of the heat source, and a heater is provided so as to heat the bearing part, and the condensing part of the heat pipe is inside the heat roll. It is arranged as follows.

Practical examples of the present invention will be described below with reference to the drawings. Figure @1 is a front view schematically showing the heat roll.

1 is a heating roll portion having a cylindrical shape, and when used in a heating roller fixing device of a copying machine, a pressure roll is pressed against this generatrix. ko is a bearing part that supports the rotation of the heating roll part/, a heat pipe 3 is arranged inside the heating roll part/, the bearing part side is an evaporation part, and the middle of the heating roll sl is a condensation part ( The position of the condensing part i is arranged so that the heating roll part is heated uniformly.As an alternative embodiment, the heat pipe 3 on the left side of FIG. The heat roll is placed close to the full length of the heating roll part l so that there is a condensation part on the stone part.

FIG. 1 is a partial vertical sectional view of FIG. 1. Heating roll section/
The circle wi6 made of gold crane that extends over the entire length serves to maintain the strength and rigidity of the roll portion 1 and also forms the tube wall of the heat pipe 3. At the position m of the condensing chamber, one end of the heat pipe J is sealed by blocking the cylinder 6 with an end plate. The evaporator s4Im side of the heat pipe J is sealed. The outer periphery of the cylinder 6 is covered with Teflon tubing and provided with a surface material t. The surface material t may be made of rubber.

The shaft 11410 of the bearing portion is supported by a bearing housing saw made of a copper-based φ alloy via a heat-resistant bearing, for example, a bearing made of Rulon. bearing .

The housing l- is fixed to a book frame of a copying rack (not shown). A band heater /3 is arranged around the outer periphery of the bearing housing /J. Figure 11g3 is a perspective view of Figure 1.

Figure 2' is a vertical cross-sectional view of another example of the present invention. In this embodiment, the bearing part of the first embodiment is not a separate part, but is made of gold.
The cylindrical cylinder 4 extends over the entire length of the heat roll, and its ends are also covered with a surface material such as Teflon material. The outer periphery of the bridge portion of the surface material t is supported by a bearing housing saw via a Rulon bearing. 13 is a panto heater.

The operation of the first embodiment shown in FIGS. 1 and 3 is that when the band heater 13 is energized, the shaft neck 10 is heated through the bearing and the housing, and the heat is transferred through the bearing by thermal conduction. The heat is transmitted to the cylindrical end part q', and the evaporator part q is heated through the metal cylindrical number.

Also, the end of the cylinder made of gold paste is heated. The heat medium in the gas phase flows through the center of the heat pipe 3 toward the condensing section at the other end, and the condensing section! The heat medium is evaporated in the wick/da of the heat pipe 3 at 9 degrees, and the heat discharged at the condensing section S heats the metal cylinder 4 and is transmitted in the axial direction. The parts of the cylinder 1 that are heated are the evaporation part q position and the condensation part! 1, the surface material t travels through the cylinder 1 as shown by the arrow in FIG.
heat is transferred to

In the embodiment shown in FIG. 1, the bearing housing and the glue are heated by the band heater 3, which transfers heat to the evaporator section DA through the surface material t, and also heats the cylinder number. That is, heat pipe J
This embodiment differs from the first embodiment in that the metal cylinders 6 and 6 are both directly heated without going through the bearings. Since the surface material t is a thin layer, it hardly reduces the thermal conductivity. Further, the surface material t may be removed from the inner peripheral portion of the bearing housing l.

Next, a comparison will be made between a conventional heat roll using a halogen heater and a heat roll according to the present invention. Assuming that the diameter of the heat roll is OVa and the external dimensions are the same, the calculated values are as follows.

Heater capacity iH/3tyoW (D% (D is
And, moreover, the time required for warm-up is less than i minutes? Shortened to 1 minute.

As mentioned above, since the heat roll of the present invention includes a heat pipe in the heating roll, the warming-up time is considerably short.

Temperature drops quickly after turning off the heater 1. 3. Low power consumption. In the case of heat-fixing equipment for electronic copying machines, a 10oV power supply is required for high-speed machines.

The heater part can be made more compact.

The temperature distribution on the roll surface becomes almost uniform.

The bearing part is supported by a heat-resistant Rulon bearing.

Since the bearing housing is made of a metal with good heat conductivity, and the band heater is used to heat the bearing housing from the outer periphery, it is easily heated even though the heat pipe rotates. The heater is located outside the wiring mechanism, which is advantageous for manufacturing and maintenance.

[Brief explanation of the drawing]

FIG. 1 is a front view of the row of ponds according to the present invention, FIG. 1 is an enlarged vertical sectional view of FIG. 1, FIG. 3 is a perspective view of FIG. 1, and FIG. It is a front view. /...Heating roll part C...Bearing part C'...Cylindrical end J...Heat pipe K...Evaporation part 3
...Condensing part 6...Metal cylindrical part 7...End plate
t...Surface material 10...Shaft //...Bearing l
Co...Bearing/1 housing 13...Band heater
/---Wick. Patent applicant Copia Co., Ltd.

Claims (1)

[Scope of Claims] l A heating roll supported by a bearing that rolls and heats an object to be heated is provided with a double heat pipe inside the heating roll, and a heat source of the heat pipe is arranged at a position where the heating roll is supported. -) o-le. The heat roll according to claim 1, wherein the tube wall of the heat pipe is integrally formed with a part of the metal cylinder of the heat roll. The heat roll according to claim 1, wherein both ends of the heat roll are supported by a metal bearing housing having high thermal conductivity via heat-resistant bearing members, and the heat roll has bearings with a heat source disposed on the outer periphery of the bearing housing.