JP2002049247A - Transfer-carrying belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image-forming device, capable of obtaining stable high-quality images over a long time by preventing transfer crawling, transfer insufficiency and transfer rolling of transfer material into a photoreceptor by performing constant-current control, in the case of electrifying the transfer carrying belt of a transfer carrying belt device. SOLUTION: This transfer-carrying belt device is provided with a transfer bias constant-current applying means for electrostatically transferring a toner image on a photoreceptor to the transfer material on the transfer carrying belt, a heating means for the transfer carrying belt, and a resistance detection means for the transfer-carrying belt. The transfer carrying belt is constituted of an endless semiconductive rubber belt stretched and laid over two or more rollers. Then, the device is provided with a control means varying the resistance value of the transfer carrying belt, by actuating the heating means according to the output from the resistance detection means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer / conveying belt device in an image forming apparatus, and more particularly, to a transfer material (transfer paper) on which an image has been transferred, being caught in a photoreceptor, causing a transfer shortage, and causing discharge. The present invention relates to a transfer / conveying belt device that eliminates occurrence of image defects such as transfer repelling of a transferred image.

[0002]

2. Description of the Related Art A transfer conveyance belt of a transfer conveyance belt device places a transfer material such as transfer paper on a seamless endless belt and conveys the toner image formed on a photosensitive member onto the transfer material while conveying the transfer material at the same speed as the belt. The transfer is performed to obtain a transfer image, and the transfer position with respect to the photoreceptor from the leading edge to the trailing edge of the transfer material (paper) is stable without fluctuation. Is excellent.

However, the optimum transfer conditions change due to the influence of the water content of the transfer material fluctuating between the environment and the printing on the front and back, and the resistance of the transfer conveyance belt fluctuating due to the environment and the printing history. There was a problem that it could not be obtained stably.

That is, in a transfer / conveying belt apparatus using a semiconductive rubber belt, the resistance value of the rubber belt decreases in a high humidity environment, and the transfer charge cannot be held in the rubber belt. A large amount of transfer charge flows in, causing a problem that the transfer paper is wound around a photosensitive drum. Conversely, in a low-humidity environment, the resistance value of the rubber belt becomes excessively high, and peeling discharge occurs, causing transfer repelling on an image. Defects appear.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transfer / conveying belt device of an image forming apparatus capable of always obtaining a high quality transferred image stably without the above-mentioned drawbacks of the prior art. .

[0006]

This object is achieved by any of the following technical means (1) to (11).

(1) A transfer bias constant current applying means for electrostatically transferring the toner image on the photoreceptor to the transfer material on the transfer / conveying belt, a heating means for the transfer / conveying belt,
A transfer conveyance belt device having a resistance detection means for the transfer conveyance belt, wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers, and an output of the resistance detection means is provided. And a control means for changing the resistance value of the transfer conveyance belt by operating the heating means in accordance with the control means.

(2) The transfer / conveying belt apparatus according to the above (1), wherein the heating means is operated until the output of the resistance detecting means of the transfer / conveying belt reaches a predetermined value.

(3) A transfer and conveyance belt device for carrying and transferring the transfer material in an image forming apparatus for forming images on both front and back surfaces of the transfer material and transferring a toner image from a photosensitive member to the transfer material in a transfer area. A transfer / conveying belt device comprising a control means for setting a transfer condition corresponding to each of the front and back surfaces and controlling image transfer.

(4) In addition to the setting of the transfer conditions, control means for controlling image transfer by further setting a separation condition in correspondence with the front and back surfaces is provided. Transfer conveyor belt device.

(5) In addition to the setting of the transfer conditions, control means for controlling the image transfer based on the environment, the number of prints, or the type of the transfer material, in addition to the setting of the transfer conditions, is provided. (3) The transfer-conveying belt device according to item (3).

(6) In addition to the setting of the transfer condition and the separation condition, control means for controlling image transfer based on the environment, the number of prints, or the type of transfer material is provided in addition to the setting of the transfer condition and the separation condition. The transfer / conveying belt device according to item (4), wherein

(7) A constant current applying means for a transfer bias for electrostatically transferring the toner image on the photoreceptor to the transfer material on the transfer / conveying belt, a heating means for the transfer / conveying belt,
A transfer conveyance belt device having a resistance detection unit for the transfer conveyance belt and a humidity detection unit, wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers. Depending on the output of the humidity detection means,
A transfer / conveyance belt apparatus, further comprising control means for operating the heating means to vary the resistance value of the transfer / conveyance belt.

(8) The transfer / conveyor belt device according to the item (7), wherein the heating means is operated for a predetermined time in accordance with the output of the humidity detecting means.

(9) A transfer / conveying belt apparatus having a transfer bias constant current applying unit for electrostatically transferring the toner image on the photosensitive member onto the transfer material on the transfer / conveying belt, and a heating unit for the transfer / conveying belt. Wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers, and the heating means is in non-contact with the transfer conveyance belt, and forms a loop path in which the belt travels. A transfer conveying belt device provided inside.

(10) A transfer / conveying belt apparatus having a transfer bias constant current applying unit for electrostatically transferring the toner image on the photosensitive member onto the transfer material on the transfer / conveying belt, and a heating unit for the transfer / conveying belt. Wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers, and wherein the heating means is in contact with the transfer conveyance belt. apparatus.

(11) The transfer / transport belt device according to the item (10), wherein the transfer / transport belt is driven when the heating means is operating.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of an image forming apparatus to which the present invention is applied will be described with reference to a schematic configuration diagram of FIG.

An image forming apparatus 1 shown in FIG. 1 is an image forming apparatus of a digital type, and includes an image reading section A, an image processing section B, an image forming section C, and a transfer material transport section D as a transfer material transport section. It is configured.

An automatic document feeder for automatically transporting a document is provided above the image reading section A.
The original placed on the original 1 is moved by the original transport roller 12 to the original 1.
The sheets are separated and conveyed, and the image is read at the reading position 13a. The document for which the reading of the document has been completed is discharged onto the document discharge tray 14 by the document conveying roller 12.

On the other hand, the image of the original placed on the platen glass 13 is read in a V-shape by a reading operation at a speed v of a first mirror unit 15 comprising an illumination lamp and a first mirror constituting a scanning optical system. Reading is performed by moving the second mirror unit 16 including the second mirror and the third mirror located at the speed v / 2 in the same direction.

The read image is formed on a light receiving surface of an image sensor CCD, which is a line sensor, through a projection lens 17. The line-shaped optical image formed on the image sensor CCD is sequentially photoelectrically converted into an electric signal (brightness signal), and then A
After performing / D conversion and performing processing such as density conversion and filter processing in the image processing unit B, the image data is temporarily stored in the memory.

In the image forming section C, a drum-shaped photosensitive member 21 serving as an image carrier and a charger 22 serving as a charging unit, a developing unit 23, and a transfer conveyor belt serving as a transfer unit are provided as image forming units. Device 45, cleaning means 26
And PCL (pre-charge lamp) as light elimination means
27 are arranged in the order of operation. The photoreceptor 21 is formed by applying a photoconductive compound on a drum substrate. For example, an organic photoreceptor (OPC) is preferably used, and is driven to rotate clockwise in the drawing.

After the rotating photoreceptor 21 is uniformly charged by the charger 22, image exposure based on the image signal called from the memory of the image processing unit B is performed by the exposure optical system 30 as image exposure means. Done. An exposure optical system 30 serving as an image exposure means as a writing means uses a laser diode (not shown) as a light emission light source, passes through a rotating polygon mirror 31, an fθ lens 34, and a cylindrical lens 35, and the optical path is bent by a reflection mirror 32 to perform main scanning. In this case, image exposure is performed on the photoconductor 21 at the position Ao, and a latent image is formed by rotation (sub-scan) of the photoconductor 21. In one example of the present embodiment, a character portion is exposed to form a latent image.

The latent image on the photoreceptor 21 is subjected to reversal development by the developing device 23, and a visible toner image is formed on the surface of the photoreceptor 21. In the transfer material transport section D, paper feed units 41 (A) and 41 serving as transfer material storage means in which transfer materials P of different sizes are stored below the image forming unit.
(B) and 41 (C) are provided, and a manual paper feed unit 42 for performing manual paper feed is provided on the side, and a transfer material P selected from any of them is supplied to a guide roller 43.
The transfer material P is fed along the conveyance path 40, and the transfer material P is temporarily stopped by a pair of registration rollers 44 for correcting the inclination and deviation of the fed transfer material P, and then re-fed, and The transfer material is guided by the pre-transfer roller 43a, the paper feed path 46, and the entrance guide plate 47, and the toner image on the photoconductor 21 is placed and transported on the transfer transport belt 454 of the transfer transport belt device 45 at the transfer position Bo. The transfer material P is separated from the surface of the photoreceptor 21, and is conveyed to a fixing device 50 by a transfer conveyance belt device 45.

The fixing device 50 has a fixing roller 51 and a pressure roller 52. By passing the transfer material P between the fixing roller 51 and the pressure roller 52, the toner is heated and pressurized. Weld. The transfer material P on which the toner image has been fixed is discharged onto the discharge tray 64.

The above is a description of a state in which an image is formed on one side of the transfer material. The image forming apparatus 1 of this embodiment performs reverse conveyance before discharging the transfer material P, and An image is formed on the back side, and double-sided transfer can be performed.

In this case, the transfer material P on which the image has been fixed on the front surface is guided by the conveyance direction switching member 62 and descends along the reversing conveyance path 60 to form the switchback path 60a.
Once, is carried out, is carried out, is reversed between the front surface and the back surface, and is driven in the second reversing conveyance path 60b by the conveyance roller pair 43b. Further, the sheet is re-fed along the conveyance path 40 by the guide roller 43. Then, the transfer material P is temporarily stopped and then re-fed by a pair of registration rollers 44 for correcting the inclination and the deviation of the transfer material, and the toner image of the back surface image formed on the photoconductor 21 is transferred to the transfer position. At Bo, the transfer material P is transferred onto the rear surface of the transfer material P while being placed and transported on the transfer transport belt 454 of the transfer transport belt device 45, separated and transported, fixed, and discharged onto the paper output tray 64.

Next, an example of the transfer / conveying belt device of the present invention will be described with reference to the front view of FIG. 2 and the graph of FIG.

The transfer / transport belt 454 of the transfer / transport belt device 45 is a seamless belt having CR rubber as a base material and having a surface coat layer having a low coefficient of friction on the transfer material P carrying surface. , A transfer bias applying roller 241 is provided on the inner surface of the belt 454, and a cleaning blade 455 is provided on the outer surface thereof.
8 is provided inside the transport loop of the belt 454 in a non-contact manner.

The transfer / transport belt 454 is stretched over a drive roller 451 and a driven roller 452 in a state where the transfer / transport belt 454 is extended from the natural length by about 4% in the longitudinal direction of the belt. Slip between the belts is avoided, and stable and accurate conveyance is performed. In addition, the durability of the belt and its coated surface is maintained without deterioration.

In the transfer charging section, a transfer bias applied by a transfer bias applying roller 241 installed inside the transfer / transport belt 454 is supplied to the transfer / transport belt 454 from the high-voltage power supply 242 under the constant current control of a polarity opposite to that of the toner. .

The cleaning blade 455 has a urethane rubber blade in counter contact with the belt 454.

The heater 458 is operated only when the resistance value of the transfer / transport belt 454 is small by a belt resistance detector built in the control means 459, thereby eliminating unnecessary energy consumption and increasing the temperature of the transfer belt itself and the surrounding temperature. The adverse effects on other units can be reduced.

That is, if the current value when a bias is applied between the transfer bias applying roller 241 and the driven roller 452 is larger than a predetermined constant current value which is the lower limit as shown in the graph of FIG. Heater 458 until lower limit
Is turned on.

The above control is performed by the control means 459 shown in FIG.

The transfer / transport belt 454 has a base material of CR rubber, polyurethane rubber, EPD having a thickness of about 0.5 mm.
M rubber or the like is used, and a fluorine-based material having a thickness of about 5 μm is coated on the surface layer.

Further, the transfer bias applying roller 241
Polyurethane, EPDM rubber, sponge, or the like is used as the material of the cleaning blade 455, and polyurethane rubber is used as the material of the cleaning blade 455.

Next, another example of the transfer / conveying belt device of the present invention will be described with reference to the front views of FIGS. 4 and 5 and the graph of FIG.

As shown in FIG.
No. 5, a transfer bias constant current applying means for supplying a transfer charge by a corotron discharger 241C disposed slightly behind the transfer belt 454 made of CR rubber is provided as described above. When the image forming apparatus 1 in which the apparatus is installed performs image formation on both sides of the transfer material P, the transfer current when performing image formation on the front side is high, and the transfer current when performing image formation on the back side is low. By setting, transfer repelling on the back side was prevented, and good image quality was obtained. Further, by controlling the humidity separately on the front and back (the transfer current is high under high humidity and the transfer current is low under low humidity), insufficient transfer under high humidity and transfer repelling under low humidity can be prevented. In addition, the contact plate 2 for grounding is
44 are in contact.

Since the resistance value gradually increases as the number of printed sheets is accumulated and the deterioration of the transfer belt 454 advances, the transfer bias current of the corotron discharger 241C is gradually increased in consideration of this, and the transfer transfer is performed. Belt 45
A good image could be obtained by compensating for the insufficient transfer due to the increase in the resistance of No. 4.

FIG. 5 shows a transfer / conveying belt device 4.
5 is that the transfer member 241 (plate or roller) in contact with the back surface of the transfer transfer belt 454 made of polyurethane constitutes transfer bias constant current applying means for supplying transfer charge. Other than that, the apparatus has the same configuration as that of FIG. 4, and the operation and effect of preventing insufficient transfer under high humidity and transfer repelling under low humidity are completely the same as those shown in FIG. there were.

That is, in the transfer / transport belt device 45 shown in FIGS. 4 and 5, the heater provided inside the loop in which the transfer / transport belt 454 runs via the control means 460 based on the detection information of the humidity detector 461. 458 is controlled to perform heating suitable for the transfer characteristics of the front and back surfaces.

Incidentally, the back surface is the one immediately after passing through the fixing device 50 as compared with the front surface and has a low water content, so that the resistance value of the transfer material is high. The empirical value can also be entered in the control means 460 and controlled.

Then, even when the detection information of the humidity detector 461 is a one-sided image, the control means 4 shown in FIGS.
60 is important because a high quality image can be stably obtained. In that case, the relative humidity in the machine should be 50-100%
FIG. 6 is a graph showing the relationship with the optimal heating operation time at which good image quality is obtained when the temperature is changed to. The vertical axis is O for the heater.
The N / OFF ratio, that is, the duty ratio (%), was set to 10 seconds per cycle.

As shown in this graph, unnecessary energy consumption is eliminated by turning on the heater only for a time corresponding to the internal humidity, and the adverse effect of the increase in the peripheral temperature on the transfer / conveying belt 454 itself and other units can be reduced. it can.

Further, the transfer / conveying belt 45 used in the present invention
The material of No. 4 is an electron conductive type polyurethane, and as the number of times of image formation increases, that is, as the number of printed sheets increases, the destruction of the conductive chain between carbon particles progresses,
The electrical conductivity gradually decreases and the resistance increases. To correct this, although not shown, it is necessary to gradually increase the transfer bias voltage depending on the number of prints to compensate for insufficient transfer due to an increase in the resistance of the transfer conveyance belt 454. In the present embodiment, a good image can be obtained by controlling this. Further, since the optimum resistance value of the transfer conveyance belt 454 differs depending on the type of the transfer material P, it is desirable to include this in the control factor.

In the transfer / transport belt device 45 shown in FIG. 2, FIG. 4, and FIG. 5, a heater 458 is installed inside the loop in which the transfer / transport belt 454 runs away from the belt 454 in a non-contact manner.

When heating is performed from the outer surface of the transfer / conveyance belt 454, the belt 4
In some cases, it is necessary to drive the driving member 54, and there is a case where a peripheral temperature rise has a large adverse effect on other adjacent members. In order to avoid such a situation, as shown in FIGS. 2, 4 and 5, the heater 458 is disposed inside the belt 454 in a non-contact manner, and the effect is great.

However, the non-contact arrangement has a poor heat transfer efficiency. In order to improve the heat transfer, the above-mentioned problem can be reduced by directly heating the belt by contacting the belt. Nevertheless, as described above, contacting the transfer conveyance belt 454 from outside the belt has a great effect on other peripheral members.
As shown in the front view of FIG. 7, instead of the heater 458, the driving roller and the driven roller are replaced with heat rollers 451R and 452R each having a resistance heating element disposed inside, so as to contact from inside.

As an example in which a heater is brought into contact with the outside of the transfer / transport belt 454, as shown in the front view of FIG. 8, the transfer / transport belt 454 is stretched over a drive roller 451 and a driven roller 452. A heat roller 458R having a resistance heating element provided therein at a position where the belt 454 is sandwiched together with the driven roller 452 in contact therewith.
Are arranged. This is the transfer conveyor belt 4
This means that the configuration shown in FIG. 8 may be used if the environment is not so affected by the heat of the peripheral members even outside the area 54.

Transfer transfer belt 4 as shown in FIGS.
In the case where a contact type heater is provided at 54, the transfer / conveyance belt 454 is always driven during the heating operation of the heater, whereby the heat transfer to the transfer / conveyance belt 454 becomes uniform. Occurs.

The transfer / conveying belt device 4 shown in FIG.
5, the corotron discharger 241C is used as a means for applying a constant current of the transfer bias to the transfer conveyance belt 454. However, the transfer conveyance belt device 45 shown in FIGS. A corotron discharger 241C may be used in place of the transfer bias applying roller (or a rod) 241 as a transfer bias constant current applying unit.

Further, by performing constant current control of the transfer / conveyance belt 454, transfer repelling, insufficient transfer, and entanglement of the transfer material in the photoreceptor can be eliminated. Is unnecessary and the production cost is advantageous.

The transfer / conveying belt 454 used in the present invention has a CR rubber having a thickness of about 0.5 mm as described above on its base material.
Polyurethane rubber, EPDM rubber, or the like is used, and a surface material is coated with a fluorine-based material having a thickness of about 5 μm.

The control corresponding to the change of the environment (temperature and humidity) and the number of printed sheets has been described separately for the front and back sides.
Since the transfer conditions are different depending on the type of transfer material (eg, basis weight, special paper, OHT sheet, second original drawing paper, etc.), a constant current amount for applying a voltage to the transfer conveyance belt 454 to satisfy the transfer characteristics for each type of transfer material. The optimum conditions were programmed and controlled in consideration of the relationship with humidity and humidity, and good stable results were obtained.

In addition to the above transfer conditions, it is important to control the constant current value to an appropriate value as a separation condition so as to prevent the transfer material P from being caught in the photosensitive member 21 or the transfer conveyance belt 454. is there.

The resistance heating element of the non-contact heater used in the present invention heats the transfer conveyance belt 454 more uniformly.
A plurality may be arranged. In addition, the contact type heater is a heat roller 451R, 452 having a resistance heating element disposed therein.
R, 458R was used.

In FIG. 2, FIG. 4, FIG. 5, FIG. 7, and FIG. 8 showing the embodiment of the above-described transfer / conveying belt device 45, the transfer / conveying belt 454 includes a driving roller 451 and a driven roller 4
52 shows a state in which it is stretched between two rollers, but the invention is not limited to this, and a plurality of driven rollers can be arranged. FIG. 1 shows an example in which the number of driven rollers is two.

[0060]

According to the present invention, by performing constant current control on the charging of the transfer belt of the transfer belt apparatus of the present invention, transfer repelling, insufficient transfer, and entanglement of the transfer material into the photoreceptor are eliminated. An image forming apparatus capable of obtaining a high-quality image can be provided.

In addition, the high-pressure separator, which has been used in the prior art, becomes unnecessary, which is advantageous in the production cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus to which the present invention is applied.

FIG. 2 is a front view of an example of an embodiment of the transfer / conveying belt device of the present invention.

FIG. 3 is a graph showing a relationship between a change in a constant current value and a change in a heater ON time.

FIG. 4 is a front view of an example of an embodiment of the transfer / conveying belt device of the present invention.

FIG. 5 is a front view of an example of an embodiment of the transfer / conveying belt device of the present invention.

FIG. 6 is a graph showing a relationship between a change in an on-off ratio of an optimal heater and a change in an in-machine relative humidity.

FIG. 7 is a front view of an example of an embodiment of the transfer / conveying belt device of the present invention.

FIG. 8 is a front view of an example of an embodiment of the transfer / conveyance belt device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 21 Photoreceptor 22 Charging device 23 Developing device 26 Cleaning means 30 Exposure optical system 45 Transfer conveyance belt device 50 Fixing device 241 Transfer bias application roller 241C Corotron discharger 242 High voltage power supply 244 Ground contact plate 451 Drive roller 451R Heat Roller 452 Driven roller 452R Heat roller 454 Transfer / transport belt 455 Cleaning blade 458 Heater 458R Heat roller 459 Control means 460 Control means 461 Humidity detector

Claims (11)

[Claims] 1. A transfer bias constant current applying unit for electrostatically transferring a toner image on a photoconductor to a transfer material on a transfer / conveying belt, a heating unit for the transfer / conveying belt, and a resistance of the transfer / conveying belt. A transfer conveyance belt device having a detection means, wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers, and wherein the heating and the heating are performed in accordance with an output of the resistance detection means. And a control means for operating the transfer means to change the resistance value of the transfer conveyance belt. 2. The transfer conveyance belt device according to claim 1, wherein the heating unit is operated until the output of the resistance detection unit of the transfer conveyance belt reaches a predetermined value. 3. An image forming apparatus for forming an image on both front and back surfaces of a transfer material, wherein the transfer material carries and conveys the transfer material and transfers a toner image from a photosensitive member to the transfer material in a transfer area in a transfer area. A transfer / conveying belt device comprising a control means for setting transfer conditions corresponding to each side and controlling image transfer. 4. The transfer according to claim 3, further comprising control means for setting image separation conditions and controlling image transfer in addition to setting the transfer conditions corresponding to the front and back surfaces. Conveyor belt device. 5. In addition to the setting of the transfer condition, a control unit for controlling image transfer based on the environment, the number of prints, or the type of transfer material, in addition to the setting of the transfer condition, is provided. The transfer conveyance belt device according to claim 3, wherein 6. A control means for controlling image transfer based on the environment, the number of prints, or the type of transfer material, in addition to the setting of the transfer condition and the separation condition, corresponding to the front and back surfaces. The transfer conveyance belt device according to claim 4, wherein: 7. A transfer bias constant current applying unit for electrostatically transferring a toner image on a photoconductor to a transfer material on a transfer / conveying belt, a heating unit for the transfer / conveying belt, and a resistance of the transfer / conveying belt. A transfer conveyance belt device having a detection unit and a humidity detection unit, wherein the transfer conveyance belt is
A control means is provided which is constituted by an endless semiconductive rubber belt stretched over at least one roller, and which operates the heating means to vary the resistance value of the transfer conveyance belt in accordance with the output of the humidity detection means. A transfer belt device. 8. The transfer conveying belt device according to claim 7, wherein the heating unit is operated for a predetermined time in accordance with the output of the humidity detecting unit. 9. A transfer / conveyance belt device comprising: a transfer bias constant current application unit for electrostatically transferring a toner image on a photoconductor onto a transfer material on a transfer / conveyance belt; and a transfer / conveyance belt heating unit. And the transfer conveyance belt is 2
An endless semiconductive rubber belt stretched over at least one roller, wherein the heating means is provided in a non-contact manner with the transfer / transport belt and inside a loop path on which the belt travels. Transfer conveyor belt device. 10. A transfer / conveyance belt apparatus comprising: a transfer bias constant current application unit for electrostatically transferring a toner image on a photoconductor onto a transfer material on a transfer / conveyance belt; Wherein the transfer conveyance belt is constituted by an endless semiconductive rubber belt stretched over two or more rollers, and wherein the heating means is in contact with the transfer conveyance belt. . 11. The transfer conveyance belt device according to claim 10, wherein the transfer conveyance belt is driven when the heating unit is operating.