Heater and image heating conduction device thereof

Abstract

A heater comprises more than two groups of heating wires, and the distance between at least one group of heating wires and other heating wires is widened or narrowed. The utility model further provides an image heating conduction device, which comprises the heater and the image heating conduction device, the heater is positioned on the inner side of the fixing film; the pressure roller is positioned on the outer side of the fixing film, and a gap is formed between the pressure roller and the fixing film. According to the utility model, the problem of poor paper fixing caused by uneven temperature in the process of conducting heat to paper by the heater is solved. The waste of paper, carbon powder and energy consumption caused by poor fixing effect of the printed manuscript is reduced, and the quality of the printed manuscript is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heating device, more particularly to a fixing heater and an image heating and conducting device thereof. BACKGROUND

[0002] The existing laser printer has the following several kinds of heaters. However, they all have technical defects.

[0003] The first kind is that two heating wires heat in the same circuit. The heating wires are symmetrical with several points in the middle. The disadvantage is that the heating circuit is single, and when printing different papers, the edge fixing temperature is often too high, which can easily cause the silicone or PI (polyimide) material at the edge of the fixing film to become brittle and thus broken, thereby shortening the service life of the heater assembly.

[0004] The second kind is that two heating wires heat in two different circuits. The heating wires are symmetrical with several points in the middle. The disadvantage is that the overall heating is not balanced, which can cause the printing temperature on one end of the film surface to be too high, ghosting when printing papers below 80g, and the fuse to be disconnected too late.

[0005] The third kind is that three heating wires heat in two different circuits. The heating wires are symmetrical with several points in the middle. The disadvantage is that the overall heating is not balanced, which can easily cause the single heating wire to be at a high temperature and the fuse to be disconnected too late.

[0006] The fourth kind is that four heating wires heat in two different circuits. The heating wires are symmetrical with several points in the middle. The disadvantage is that the overall heating is not balanced, which can cause the printing temperature on one end of the film surface to be too low, the paper not to be fixed, and the fuse to be disconnected too late. INVENTION CONTENTS

[0007] In view of the problems in the background art, the utility model provides a kind of heater, comprising: two groups of heating wires, wherein at least one group of heating wires is widened or narrowed in distance from other heating wires.

[0008] The utility model further provides an image heating and conducting device, comprising: the heater as described above;Fixing film, the heater is located in the inside of the fixing film;Pressure roller, it is located the outside of the fixing film and is spaced apart with the gap of the fixing film.

[0009] Further, the distance between the at least one group of heating wires and other heating wires at the end is widened or narrowed.

[0010] Further, the distance between the at least one group of heating wires and other heating wires at the middle position is widened or narrowed.

[0011] Further, the heater comprises: a base material made of alumina or aluminum nitride ceramic; a conductor layer arranged on the base material; and the heating wire embedded on the conductor layer and encapsulated.

[0012] The beneficial effects of the present application include: in one aspect, the temperature unevenness of the heater during heat conduction to the paper causes poor fixing of the paper. The waste of paper, toner and energy consumption caused by poor fixing of the printed document is reduced, and the quality of the printed document is improved.

[0013] Further, the at least one group of heating wires is widened or narrowed in distance from other heating wires at the corresponding area of the hot face resistance of the image heating transmission device.

[0014] Further, the at least one group of heating wires is widened or narrowed in distance from other heating wires at the corresponding position of the thermal fuse of the printer.

[0015] Further, the at least one group of heating wires is narrowed in the area close to the thermal fuse.

[0016] Further, the at least one group of heating wires is wider than the remaining area from one end close to the gear to 40% of the overall length of the heating wire.

[0017] Further, the width of the heating wire is gradually widened by 15-30% within the range of 0.5-5cm from the middle of the conductor layer.

[0018] In another aspect, the problem that the thermal fuse connected to the heater cannot be disconnected in advance when the temperature is too high is solved. The probability of damage to one end of the fixing film is reduced, and the service life of the heater assembly is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more easily understand the present application, the present application will be described in more detail by referring to the specific embodiments shown in the drawings. These drawings only depict typical embodiments of the present application and should not be considered as limiting the scope of protection of the present application.

[0020] Figure 1 The cross-sectional view of the heater assembly to which the heater of the present application is applied.

[0021] Figure 2 The top view of one end of the heater of the present application.

[0022] Figure 3 The top view of the heater of the present application in which the heating wire is widened at the thermistor.

[0023] REFERENCE NUMERALS

[0024] 1-heater, 11-heating wire, 12-conductor layer, 13-encapsulation layer, 14-substrate, 2-fixing film, 3-pressure roller, 4-printing paper, 5-heating sheet support, 6-thermistor, 7-thermal fuse, 8-wire, 9-gear, A-heater center, B-unadjusted width heating wire, C-adjusted width heating wire. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described below with reference to the accompanying drawings, so that those skilled in the art can better understand the present application and implement it. The embodiments listed are not intended to limit the present application, and the embodiments described below and the technical features in the embodiments can be combined with each other without conflict, wherein the same components are denoted by the same reference numerals.

[0026] Figure 1 The heater assembly under the printing process is shown, which includes the heater 1 of the present application. The heater 1 is located inside the cylindrical fixing film 2, and a gap is left between the fixing film 2 and the pressure roller 3 for the printing paper 4 to pass through. When the printing paper 3 passes between the fixing film 2 and the pressure roller 3, the heater 1 provides heat, which is conducted to the printing paper 3 through the fixing film 2. The pressure roller 3 applies pressure to extrude the softened toner on the printing paper 3 into the gap of the paper fibers.

[0027] Preferably, the heater is a ceramic thick film heating device, which is attached to the inner wall of the fixing film 2, has a substrate, and is provided with 2 or more groups of heating circuits (heating wires) on the substrate.

[0028] The pressure roller 3 (pressurized elastic roller) is attached to the outer wall of the fixing film 2. The pressure roller 3 has a metal shaft core and a silica gel with elasticity. The production movement path of the printed matter passes through the gap between the pressure roller 3 and the fixing film 2.

[0029] Figure 2 The top view of one end of the heater of the present application is shown. The heater includes a substrate 14 made of alumina or aluminum nitride ceramic. The substrate 14 is provided with a conductor layer 12, and the conductor layer 12 is provided with heating wires 11, which are then encapsulated. Figure 2 In the shown embodiment, the heating wires of the heater are four groups at the heater center area A, and the heating wires 11 evolve into the form at one end: b is the heating wire without width adjustment, and the end C is the heating wire after width adjustment (three groups of heating wires). The edge heating wires (red line marked part) of the heater of the present application are narrowed, so as to adjust the heat distribution of the heater, and the local narrowing will obtain higher temperature, solving the problem of low temperature in this section, so as to improve the fixing effect.

[0030] The size of the heating wire of the heater is adjusted, so that the heat distribution of the heater is adjusted, to compensate for the imbalance of local temperature caused by the uneven heat removal of the printer during movement. In the process of continuous printing, the pressure fluctuation caused by local movement can cause the place with large pressure to contact the heat-sensitive fixing film closely, and the heat is more easily removed. The place with small pressure contacts the heat-sensitive fixing film relatively loosely, and the heat conduction efficiency is low, and the heat cannot be removed. The local temperature is high.

[0031] Figure 3 An embodiment of the heating and conducting device of the utility model is shown. The position relationship of the heater support, the thermistor, the heater and the local heating wire of the heater is shown in the figure.

[0032] The heater support 5 is used to support the heater 1, and five groups of heating wires are shown in the figure. The heating wire has a thermistor (red part). Four groups of heating wires are in normal position (yellow part), and one group of heating wires is widened (green part), and preferably, the position of the widened heating wire is the thermistor, so as to reduce the heat of the local part, and the temperature of the green area heating wire detected by the thermistor is lower than that of the yellow area, so as to increase the temperature of all the yellow areas, so as to solve the problem of insufficient fixing temperature.

[0033] The heating and conducting device of the utility model further comprises a thermistor, and the resistance is distributed in the middle of the short side direction of the heater 1, and is distributed along the long side of the heater 2 and more than 2.

[0034] The heater assembly further comprises a thermal circuit breaker, which is connected in series in the circuit of the heater 1, and when the temperature of the above-mentioned heater exceeds the set limit, the power supply of the heater is cut off.

[0035] In summary, the heating wire on the heater of the utility model is 2 groups and more than 2 groups. If it is two groups, one group has a change in width at a certain place: widening or narrowing. If it is 3 groups, 1 group or 2 groups can be changed. Preferably, the width changes at the end of the heating wire, or the width changes at the thermistor, or the width changes at the thermal fuse.

[0036] The heating wire of the heating device of the utility model is 2 and more than 2 groups of heating wires, and preferably, one group of heating wires heats the paper in the range of 18-25 cm. The other group heats the heating piece in the range of 27-30 cm of the paper. When printing different sizes of paper, different heating ranges are provided for the printed matter, so as to reduce the ghosting problem caused by the heat accumulation at the edge of the heater.

[0037] A group of heating wires on the corresponding position of the main thermistor, the heating width is different from other areas of the heating wire, forming different temperature distribution on the whole heating wire. It is used to raise or lower the overall temperature of the fixing film.

[0038] Another group of heating wires, for the edge heating wire, the width of the heating wire is widened by 15%-30% in the range of 0.5-5cm from the middle of the conductor layer, so as to lower the temperature of the edge of the heater, thereby prolonging the service life of the fixing film.

[0039] One of the groups of heating wires near the middle of the ceramic sheet is narrowed in the area near the thermal fuse to increase the temperature of the area. The temperature is higher than that of any area on the whole heater.

[0040] At least one group of heating wires, from the end near the gear to the area of 40% of the overall length of the heating wire, the width of the heating wire is wider than the remaining area. In this way, the temperature of the gear end is lowered, and the phenomenon of ghosting caused by temperature rise and the premature termination of the service life of the fixing film is reduced.

[0041] The above-described embodiments are only the preferred specific embodiments of the present application, and the phrase "in an embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments" in the specification can refer to one or more of the same or different embodiments according to the present disclosure. The usual changes and replacements made by those skilled in the art within the scope of the technical scheme of the present application should be included in the protection scope of the present application.

Claims

1. A heater characterized by, Comprising: Two or more groups of heating wires, wherein at least one group of heating wires is widened or narrowed in distance from other heating wires, and the position of the widened or narrowed heating wires is at the position of the thermistor.

2. The heater according to claim 1, wherein, The at least one group of heating wires is widened or narrowed in distance from other heating wires at the end, and the position of the widened or narrowed heating wires is at the position of the thermistor.

3. The heater according to claim 1, wherein, The at least one group of heating wires is widened or narrowed in distance from other heating wires at the middle position, and the position of the widened or narrowed heating wires is at the position of the thermistor.

4. The heater of claim 1, wherein Comprising: A substrate made of alumina or aluminum nitride ceramic; A conductor layer arranged on the substrate; The heating wires are embedded on the conductor layer and encapsulated.

5. An image heating conduction apparatus characterized by, Comprising: The heater according to any one of claims 1-4; A fixing film, wherein the heater is located inside the fixing film; A pressure roller located outside the fixing film and spaced apart from the fixing film by a gap.

6. The image heating and conducting device according to claim 5, wherein, The at least one group of heating wires is widened or narrowed in distance from other heating wires at the corresponding area of the hot face resistor of the image heating and conducting device.

7. The image heating and conducting device according to claim 5, wherein, The at least one group of heating wires is widened or narrowed in distance from other heating wires at the corresponding position of the thermal fuse of the printer.

8. The image heating and conducting device according to claim 5, wherein, The at least one group of heating wires is the heating wire near the middle of the ceramic sheet, and the area near the thermal fuse is narrowed.

9. The image heating and conducting device according to claim 5, wherein, The at least one group of heating wires is wider than the remaining area from the end near the gear to the area of 40% of the overall length of the heating wire.

10. The image heating and conducting device according to claim 5, wherein, The width of the heating wire is gradually widened by 15-30% within the range of 0.5-5 cm from the middle of the conductor layer.

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