JPH0485230A - Transfer paper conveyance device - 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 transfer paper conveyance device, and more particularly to a device for conveying transfer paper to devices such as copying machines, laser beam printers, and facsimile machines. .

[Conventional technology]

2. Description of the Related Art Conventionally, as a device for conveying transfer paper to a copying machine, a means has been adopted in which conveyance rollers are arranged corresponding to the minimum size of paper that can be passed, and the transfer paper is guided by a guide plate between the conveyance rollers.

[Problem to be solved by the invention]

However, in the case of the above-mentioned means, when guiding transfer paper that has curled under high temperature conditions or curled copy paper that has been copied once to the roller, the leading edge or corner of the transfer paper may not fit properly into the roller nip. Transfer paper often folds or jams because it cannot enter the paper.

The conveyance of the transfer paper by the rollers largely depends on the friction coefficient of the roller surface, the pressure applied by the rollers to the transfer paper, the hardness of the rubber surface forming the rollers, and the like. However, since there is a limit to the contact area between the transfer paper and the roller, slippage occurs between the roller surface and the transfer paper, especially when a load is applied to the transfer paper in the direction opposite to the conveying direction. For this reason, in the past, a registration roller was installed just in front of the transfer paper, and the transfer paper was brought into contact with a rubber roller that applied a considerable pressure to form a deflection of the transfer paper. After correcting the skew, the timing was adjusted with the transfer device. A method is adopted in which the transfer paper is sent out by

In this method, the initial transfer paper conveyance performance is excellent, but the friction coefficient decreases due to abrasion of the rubber roller surface, the outer diameter of the rubber roller decreases, and if paper dust adheres to the rubber roller surface, the roller surface There has been a problem in that the conveyance force of the transfer paper is significantly reduced due to reasons such as the small contact area between the transfer paper and the transfer paper.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer paper conveying device that can improve the conveyance of curled transfer paper, can stably convey the transfer paper over time, and can convey the transfer paper at a desired conveyance speed. It's about doing.

[Means to solve the problem]

The above purpose is to provide a belt made of a dielectric material that conveys transfer paper fed from at least one paper feeding device to a transfer device on the downstream side of the transfer paper conveyance, and a driving roller and a driven roller that stretch this belt. A bias roller and an electrically grounded roller are provided at opposing positions across the belt, and means is provided for applying a high voltage to the bias roller and intermittently transmitting a driving force to the drive roller. This is achieved by

[Effect]

The transfer paper from the paper feeding device is guided to the entrance of the gap between the bias roller and the roller, which are disposed opposite to each other with the belt in between. After this, when the drive is transmitted to the drive roller and a high voltage is applied to the bias roller, an electric field is generated between the bias roller and the roller facing it, and electrostatic attraction occurs due to the polarization of the belt and transfer paper. generate force.

The transfer paper is conveyed by this electrostatic adsorption force and the frictional force of the belt.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the configuration 1 of the transfer paper conveying device of the present invention.
) and (B) are explanatory diagrams of the operation of the registration section in the apparatus of FIG. 1.

In this transfer paper conveyance device, there are paper feed cassettes) la,
A drive roller 2 made of rubber with a high surface friction coefficient and a metal roller 3 as a driven roller are arranged in the paper feeder. Belt 4 is stretched.

The metal roller 3 is a small diameter roller with an outer diameter of about 12 mm, and its curvature makes it easy to separate the transfer paper from the belt. Further, the metal roller 3 is grounded via a side plate.

Belt 4 has a volume resistivity of IQI11 to 1013Ω
・It consists of a rubber belt with a diameter of 0.6 mm and a thickness of 0.6 mm, and its surface is polished.

The drive roller 2 is configured to be intermittently driven by an electromagnetic clutch (not shown). Charging sections I and ■, which also serve as registration sections, are installed on the front side in the paper feeding direction when the paper feed cassettes la and lb are installed in the paper feeding device. A ground roller 7 is placed in contact with the back surface of the belt 4.
is installed.

Bias rollers 5a and 5b connected to a high-voltage power source 8 are disposed on both sides of the ground roller 7 in the belt running direction, and roller-shaped counter electrodes 6a and 6b are arranged opposite to these rollers with the belt 4 in between. is installed.

The bias rollers 5a and 5b each consist of a roller having a conductive rubber layer on a stainless steel core, and a high DC voltage is applied to the core at a predetermined timing via a high voltage power source 8. In addition, bias rollers 5a, 5
The bearing portions at both axial ends of the roller b are made of an insulator, such as polyacetal, to prevent electric charges from leaking to the side plates.

The counter electrodes 6a and 6b are made of conductive rollers, for example, stainless steel rollers, and the bearings are made of highly conductive rollers, such as stainless steel rollers, so that the rollers are biased against the belt 4 by springs.
It is electrically grounded using a copper-based sintered bearing.

Upper guide plates 9a, 9b and lower guide plates 12a, 12b are provided between the charging parts (1), (2) and the counter electrodes 6a, 6b, respectively. One end of is fixed. Further, reflective sensors 10a and 10b are installed on the upper surface side of the upper guide plates 9a and 9b to detect the running state of the transfer paper.

In the gaps formed between the upper guide plates 9a, 9b and Mylar lla, 11b, paper feed guide plates 13a,
13b is provided.

Furthermore, a conductive static eliminating brush 14 is installed at the rear of the metal roller 3 corresponding to the separation position of the transfer paper from the belt 4, and is inclined with respect to the running direction of the belt 4 near the drive roller 2. Mylar 1 made of polyester film
5 is in contact.

Next, the operation of the transfer paper conveying device configured as described above will be explained.

The transfer papers taken out from the paper feed cassettes la and lb are separated one by one from the charged parts (separating parts) ■ and ■.
As shown in FIG. 2(A), the transfer paper 16 is guided by the belt 4 along the mylar lla and llb, and the leading edge of the transfer paper 16 is attached to the sensor 1.
Detected by 0a and 10b. At this time, the electromagnetic clutch (not shown) is OFF and the belt 4 does not rotate, so the transfer paper 16 slides on the surface of the belt 4, which has a low coefficient of surface friction, and the belt 4 and the counter electrodes 6a, 6b contact each other. You will be guided between

At this time, as shown in FIG. 2(B), the counter electrode 6a,
6b are each biased toward the belt 4 side by a spring, and the leading end of the transfer paper 16 is connected to the belt 4 and the opposing electrode 6a.
, 6b. For this reason, the transfer paper 16
The Mylar 11a and Ilb are pushed down to form a deflection, thereby correcting the skew.

The electromagnetic clutch (not shown) is connected to the sensors 10a and 10 in advance.
b is set to turn on at a predetermined timing after detecting the leading edge of the transfer paper 16, and at the same time, a high voltage is applied to the bias rollers 5a and 5b. Therefore, the transfer paper 16 is guided between the belt 4 and the opposing electrodes 6a, 6b, and at the same time an electric field is generated between the bias rollers 5a, 5b and the transfer paper 16, and the electric field is generated between the belt 4 and the transfer paper 16. Polarization occurs and electrostatic adsorption force is generated. As a result, the transfer paper 16 is conveyed by this electrostatic adsorption force and the surface friction force of the belt 4.

Further, when the sensors 9a and 9b each detect the leading edge of the transfer paper 16, the timing at which the drive of the paper feed section is stopped is controlled. Therefore, when the transfer paper 16 is conveyed by the electrostatic attraction force and the surface friction force of the belt 4, the electrostatic attraction force depends on the contact area between the belt 4 and the transfer paper 16. Since the drive is stopped and the electrostatic adsorption force overcomes the load in the paper feeding section, there is no problem in conveying the transfer paper 16.

Then, the transfer paper 16 is conveyed and guided to the metal roller 3 while being in close contact with the belt 4 due to electrostatic attraction.

The circumferential speed of the belt 4 at this time is controlled to be the same as the circumferential speed of the surface of the photosensitive drum in the downstream transfer device.

As described above, the metal roller 3 has a small diameter and a large curvature, so the transfer paper 16 conveyed to the metal roller 3 by the heald 4 is easily separated from the metal roller 3 and sent to a downstream transfer device. At this time, the residual charge on the transfer paper 16 is removed via the static elimination brush 14. Further, foreign matter such as paper powder adhering to the surface of the belt 4 from which the transfer paper 16 has been separated is removed by the cleaning mylar 15. Therefore, the surface of the belt 4 guided into the gap between the bias roller 5b and the counter electrode 6b is free of foreign matter, and the bias roller 5a can easily generate electrostatic adsorption force.

In the above-mentioned embodiment, an example is shown in which the paper feed cassette has two stages, but the paper feed cassette may have three or more stages. The number of counter electrodes is set.

〔Effect of the invention〕

As explained above, according to the present invention, since the transfer paper is conveyed while being taken off and landed on the belt by electrostatic adsorption force,
The leading edge of the transfer paper does not break, and the transfer paper gets caught on the guide plate, preventing paper jams from occurring. Furthermore, since the contact area between the transfer paper and the conveyance belt during conveyance is large, slippage of the transfer paper can be reduced and skew registration can be performed at the same time. Furthermore, since the bias roller is used, no ozone is generated like corona discharge, and the working environment is not deteriorated.

[Brief explanation of drawings]

Figure 1 shows the configuration of the transfer paper conveying device of the present invention. Figure 2 (A
) and (B) are respectively explanatory diagrams of the operation of the registration region section in the present invention. Ia, lb...Paper feed cassette, 2...Drive roller,
3... Metal roller (driven roller), 4... Belt,
5a, 5b...bias roller, 6a, 6b...counter electrode, 7...ground roller, 8...high voltage power supply,
9a, 9b...upper guide plate, 10a, 10b
...Sensor, Ila, l1b-... Myra, 12a,
12b... Lower guide plate, 13... Paper feed guide plate, 14... Static elimination brush, 15... Cleaning mylar. Figure 1 Figure 2 (A) (B) Completion; 8 allb Procedural amendment (voluntary) May 13, 1991

Claims (1)

[Claims] A belt made of a dielectric material that conveys transfer paper fed from at least one paper feeding device to a transfer device on the downstream side of the conveyance of the transfer paper, and a driving roller and a driven roller that stretch this belt. A bias roller and an electrically grounded roller are provided at opposing positions, and means is provided for applying a high voltage to the bias roller and intermittently transmitting a driving force to the drive roller. transfer paper conveyance device.