JP5464538B2 - Roller for heating - Google Patents

Description

  The present invention relates to a heating roller.

  Heating rollers are widely used in various processing machines and copying machines. The heating roller is configured, for example, by incorporating a linear heater in the internal space of a cylindrical roller body. In the case of this type of heating roller, since the heating roller body is made of steel and the thermal conductivity is not so high, the temperature of both end side parts is lower than the central part for heat dissipation to the bearing side, That is, there is a problem that the temperature uniformity on the roller surface is difficult to be maintained. In addition, the air responsiveness was not so good because the air in the internal space performed a heat insulating function.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a heating roller having excellent temperature uniformity and thermal responsiveness.

  In this invention, it comprises a cylindrical roller main body having an outer peripheral surface as a heating surface, and a cast heater that heats the roller main body at an inner peripheral position thereof. The linear expansion coefficient is larger than that of the roller body, and the sheet-like one has a cylindrically deformed slit, and is formed by casting a sheathed heater over the entire base, and the outer peripheral surface of the cast-in heater is Provided is a heating roller characterized by being arranged in contact with the entire inner peripheral surface of a roller body.

  According to the above configuration, the cast heater is disposed so as to be in contact with the entire inner peripheral surface of the roller body, so that heat can be applied from the cast heater to the roller body through the contact surface without waste. Excellent. Further, the cast heater is made of a high heat conductive material, and the cast heater itself maintains a temperature-uniform state, and the roller main body is in direct contact with the cast heater, so that the roller main body is evenly heated, and thereby the surface of the cast heater is uniformly heated. Warmth is maintained.

  In particular, the casting heater base has a cylindrical shape having a linear expansion coefficient larger than that of the roller body, and a sheet-like one having a curved and deformed slit. The heat conduction is further promoted by being in close contact with the entire inner peripheral surface of the roller body, and the thermal response and temperature uniformity are further promoted accordingly. In addition, since the casting heater has a cylindrical shape with a slit, the deformation at the time of expansion described above is not completely restrained by the roller body, and is absorbed by the slit, so that the casting heater does not undergo plastic deformation, and any Adhesiveness to a constant inner peripheral surface is maintained at the operating temperature.

  In the cast-in heater, the sheathed heaters are arranged sparsely in the center part and densely in the both end parts, so that a large amount of heat is applied to both end parts than the center part and heated, so that the roller body is heated uniformly. As a result, the temperature uniformity of the surface is kept better.

  As the high thermal conductive material forming the cast heater, aluminum materials made of various aluminum alloys and copper materials made of copper alloys such as brass are preferably used.

  Since the roller main body is long and a plurality of cast heaters are arranged side by side, the temperature control of the long roller main body surface is carefully performed and the temperature uniformity is improved.

  Since the cast-in heater is provided with a circulation cooling mechanism, the cast-in heater having excellent thermal conductivity is arranged so that the cooling operation by the circulation cooling mechanism is also in contact with the inner peripheral surface of the roller body. This is done quickly by efficiently moving the heat of the main body to the cooled casting heater side.

  According to the present invention, it is possible to obtain a heating roller in which the roller main body is well heated and excellent in thermal response and excellent in temperature uniformity on the roller main body surface.

Cross-sectional configuration diagram of an embodiment of a heating roller of the present invention Side view of cast heater used in embodiment of heating roller of this invention Development view of cast-in heater used in embodiment of heating roller of this invention Cross-sectional configuration diagram of another embodiment of the heating roller of the present invention Sectional block diagram of further another embodiment of the heating roller of the present invention Side view of a cast-in heater used in still another embodiment of the heating roller of the present invention

  FIG. 1 is a sectional view of the heating roller according to the present invention. The heating roller 1 is a cylindrical casting formed by casting a sheathed heater 5 on a base 3 made of an aluminum alloy on an inner circumferential surface of a cylindrical roller body 2 made of carbon steel whose outer circumferential surface is a heating surface. A heater 6 is arranged in contact. The cast heater 6 is fixed to the roller body 2 on both sides by the fixing members 7, and the annular protrusions of the fixing members 7, 7 are respectively formed in the recesses 8, 8 formed by the cast heater 6 being shorter than the roller body 2. 9 and 9 are fitted, and fixed by attaching a detent bolt 10.

  Each of the fixing members 7, 7 has rotating shaft portions 11, 11 received by the bearings 12, 12 and is provided with communication holes 13, 13 communicating with the internal space 14 of the cast-in heater 6. A multipolar rotary connector 15 is attached to the end.

  FIG. 2 is a side view of the cast-in heater 6, and FIG. The cast-in heater 6 is provided with slits 16, the connection terminals 18 and 18 of the sheathed heater 5 are located so as to protrude at positions close to both ends of the inner surface, and the sheathed heater 5 is arranged so as to meander in the entire base 3. Yes. At that time, the sheathed heater 5 is arranged so that the distance L2 in each of the both end portions 6b is narrower than the distance L1 in the center portion 6a of the cast-in heater 6, that is, the both end portions 6b are sparse in the center portion 6a. They are densely arranged in each. As a result, a larger amount of heat is applied to the end portions 6b than to the center portion 6a.

  Each of the connection terminals 18 and 18 is connected to the multipolar rotary connector 15 through lead wires 20 and 20 through the internal space 14 and the communication hole 13. The cast-in heater 6 is formed by being cast into a cylindrical shape by a mold, and then the slit 16 is cut off.

  In the heating roller 1, a power is supplied to the sheathed heater 5 to heat the casting heater 6, and the heat is applied to the roller body 2 to perform a heating operation. As a result, it was confirmed that the thermal response and the temperature uniformity were excellent.

  This is because the caster heater 6 is disposed so as to be in contact with the entire inner peripheral surface position corresponding to the heating action portion A on the outer peripheral surface of the roller main body 2, so that the roller main body from the caster heater 6 through the contact surface. The heat responsiveness is improved when heat is applied to the heating action part A of No. 2 without waste.

  Further, in the conventional product, the temperature is inevitably lowered at both ends of the heating roller where heat is easily escaped, but the base 3 of the cast heater 6 is made of an aluminum alloy having excellent thermal conductivity, and the cast heater 6 itself is in a uniform temperature state. The roller main body 2 is in direct and continuous contact with the cast-in heater 6, and the sheathed heater 5 is sparsely arranged in the center portion 6a of the cast-in heater 6 and densely arranged in both end portions 6b. A large amount of heat is applied to both end portions 6b than 6a to heat the roller body 2, whereby the roller body 2 is uniformly heated and the temperature uniformity of the surface is maintained.

  Furthermore, since the base 3 of the cast-in heater 6 is made of an aluminum alloy and its linearity is sufficiently larger than that of the roller body 2 during heating, the outer peripheral surface of the expanded cast-in heater 6 is in close contact with the inner peripheral surface of the roller main body 2. Thus, heat conduction is further promoted, and accordingly, the temperature uniformity on the surface of the roller body 2 is further promoted. Even when the deformation at the time of expansion is excessive, it is absorbed by the slit 16 and does not cause plastic deformation in the cast-in heater 6, so that the adhesion is not impaired.

  FIG. 4 is a cross-sectional configuration diagram of another embodiment of the heating roller of the present invention. In the figure numbers, the same components as those in the above embodiment are used. In the heating roller 30, three cast heaters 6, 6, 6 are used in parallel with a long roller body 31. Also in this embodiment, good thermal responsiveness and temperature uniformity are exhibited in the same manner as in the above embodiment. In particular, in this embodiment, by controlling the temperature of each of the cast-in heaters 6, 6 and 6, it is long. The temperature of the surface of the roller body 31 is carefully controlled.

  FIG. 5 is a cross-sectional configuration diagram of still another embodiment of the heating roller of the present invention, and FIG. 6 is a side view of a cast-in heater 6 used therein. In the figure numbers, the same components as those in the above embodiment are used. In this heating roller 40, a circulating cooling mechanism 41 is provided integrally with the casting heater 6. The double pipe portion 42 of the circulation cooling mechanism 41 is disposed in the communication hole 13 of the fixing member 7 on the side where the multipolar rotary connector 15 is not attached, and the cooling water circulation pipe 43 is a sheathed heater in the base 3 of the cast-in heater 6. The cooling water circulation pipe 43 is connected to the inner pipe and the outer pipe of the double pipe portion 42, respectively, in a meandering manner. Then, the cooling water from the inner pipe of the double pipe portion 42 is fed into the cooling water circulation pipe 43 and returned to the outer pipe, whereby the casting heater 6 is cooled by circulating in the base 3 of the casting heater 6. As a result, the heating roller 40 is quickly cooled at the end of heating.

  According to the heating roller 40 of this embodiment, good thermal responsiveness and temperature uniformity are exhibited during the heating operation, as in the above embodiments. Further, in the cooling operation by the circulation cooling mechanism 41, the heat of the roller body 2 is cooled by arranging the cast heater 6 having excellent thermal conductivity so as to be in contact with the entire inner peripheral surface position of the roller body 2. This is done quickly by moving efficiently to the cast-in heater 6 side.

1 Heating roller 2 Roller body 5 Seed heater 6 Casting heater

Claims (2)

A cylindrical roller body having an outer peripheral surface as a heating surface;
It consists of a cast-in heater that heats the roller body at its inner circumferential position,
The cast-in heater has a cylindrical shape with a base made of a high heat conductive material and a linear expansion coefficient larger than that of the roller main body, and a sheet-like one having a curved and deformed slit. Cast and formed,
A heating roller, wherein an outer peripheral surface of the cast-in heater is arranged in contact with the entire inner peripheral surface of the roller body.   The heating roller according to claim 1, wherein the cast-in heater includes a circulation cooling mechanism.

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