JPS59133150A - Transfer paper conveying device - Google Patents

Abstract

PURPOSE:To correct the position of a conveying belt without adversely affecting the transfer of a toner image to a sheet of transfer paper by detecting the deviation of said conveying belt during the time when the toner image is not transferred to the transfer paper and shifting the correcting direction of the deviation in an electronic copying machine. CONSTITUTION:The conveying device B in an electronic copying machine which conveys a sheet of transfer paper fed from a paper feeding device, has a looped conveying belt 11 which consists of a dielectric, and with which a sensitizing body (figure omitted) is brought in contact on the front side, and a driving and a driven roller 12, 13 which rotate the belt in the direction of (a). It also has a sensor 22 which detects the passage of a detection piece 21 fixed to the conveying belt 11 at the time when the toner image on the sensitizing body is not transferred to the transfer paper, and a deviation sensor 24 which detects the deviation of the conveying belt 11 by detecting a detection piece 23 fixed to the conveying belt 11. And, when the deviation sensor 24 detects the deviation of the belt 11, the deviation is corrected by shifting the deviation correcting roller 14 through an adjusting means 15.

Description

Detailed Description of the Invention Technical Field The present invention relates to an electronic copying machine in which transfer paper fed from a paper feeding device is conveyed between a photoreceptor and a transfer device, and the transfer paper on which a toner image has been transferred is transferred to an electronic copying machine. The present invention relates to a transfer paper transport device that transports paper to a fixing device.

2. Description of the Related Art As a prior art transfer paper conveyance device, one is known in which a loop-shaped conveyance belt conveys the transfer paper, and a belt position correction means corrects the deviation in the position of the conveyance belt. However, in this transfer paper conveyance device, when the belt position correction means corrects the deviation in the position of the conveyance belt while the toner image on the photoreceptor is being transferred to the transfer paper, the correction direction may be switched. Therefore, there is a drawback that it adversely affects the transfer of the toner image onto the transfer paper.

OBJECT It is an object of the present invention to provide a transfer paper conveyance device that does not adversely affect the transfer of a toner image onto a transfer paper when a belt position correcting means corrects the deviation in the position of a conveyance belt.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

In FIG. 1, numerals 1 and 2 indicate photoreceptors, respectively. Around these photoreceptors 1 and 2, there are a paper feeding device A, a transfer paper conveyance device B, a transfer device C, a fixing device, and the like.
A charging device, an exposure device, a developing device, a cleaning device, a static eliminating device, etc., which are not shown, are arranged. The toners for developing the electrostatic latent images on the photoreceptors 1 and 2 are of different colors.

The paper feeding device A includes a cassette 4 which is disposed at a predetermined distance from the photoreceptor 1 and accommodates a plurality of transfer papers 3, and a cassette 4 which is rotatably disposed inside the cassette 4 and which contains transfer papers 3. 3 is placed on the rotating bottom plate 5, and the rotating bottom plate 5
and the bottom plate 4a of the cassette 4, and presses the rotating bottom plate 5 upward; the paper feed roller 7, which is placed on the front of the cassette 4; A friction pad 8 which is in elastic pressure contact with the lower part of the paper roller 7, a pair of registration rollers 9 arranged between the paper feed roller 7 and the photoconductor 1, and the paper feed roller 7 and the registration rollers. 9 and a guide plate 10 disposed between the guide plate 9 and the guide plate 10.

The transfer paper 3 in the cassette 4 is pressed against a paper feed roller 7 by the pressing force of a spring 6.

When this paper feed roller 7 is rotated in the direction of the arrow during paper feeding, the transfer paper 3 is moved to the registration roller 9 by rotational force and frictional force.
is fed in the direction of The seven transfer sheets 8 prevent a plurality of transfer sheets 3 from being fed simultaneously by the sheet feed roller 7. The registration roller 9 is the paper feed roller 7.
The transfer paper 3 is sent to the photoreceptor 1 (transferred by
．． Send in direction 2.

The transfer paper transport device B includes a loop-shaped transport belt 11 made of a dielectric material, a driving roller 12 and a driven roller 13 for moving the transport belt 11 in the direction of arrow a.
, a deviation correction roller 14 for correcting the deviation in the position of the conveyor belt 11 , a roller position adjustment means 15 for adjusting the position of the deviation correction roller 14 , and a transfer paper 3 sent from the registration roller 9 . A charging device 16 that charges the material and brings it into close contact with the conveyor belt 11 using electrostatic force.
, a static eliminator 17 for removing electricity from the transfer paper 3 after transfer in order to separate the transfer paper 3 from the conveyor belt 11, and a paper separation member 18 for separating the transfer paper 3 after transfer from the conveyor belt 11. , a cleaning member 19 that cleans the conveyor belt 11, a static eliminator 20 that neutralizes the portion of the conveyor belt 11 that has been charged by the transfer device C, and a cleaning member 19 that cleans the conveyor belt 11; belt 1
The sensor 22 detects the passage of the detection target piece 21 fixed to the conveyor belt 11, and the detection target piece 23 fixed to the conveyor belt 11 detects that the position of the conveyor belt 11 is deviated from the proper position. A bias sensor 24 that detects
It consists of

The transfer paper 3 sent from the registration roller 9 is charged by the charging device 16 and transferred to the conveyor belt 1 by electrostatic force.
The transfer device C charges the conveyor belt 11 and transfers the charged toner image of the photoreceptor 1.2 onto the transfer paper 3 by electrostatic force as the conveyor belt 11 passes through the gap. Next, the transfer paper 3 is neutralized by a static eliminator 17, separated from the conveyor belt 11 by a paper separation member 18, and sent to a fixing device.

As shown in FIG. 2, the roller position adjustment means 15 includes a latch solenoid 15a, a drive circuit 15b that supplies current to drive the latch solenoid 15a, and the deviation correction roller 14.
One end is engaged with the shaft of 15cK, and the middle part is engaged with the shaft of
A rotatably supported lever 15d, the other end of this lever 15d, and an operating rod 15 of a latch solenoid 15a.
and a connecting plate 15f that connects the The drive circuit 15b is capable of supplying current in different directions to the latch solenoid 15a.
When a current in a direction different from vc is supplied, the actuating rod 15e is moved in the direction indicated by the arrow or in the opposite direction. The latch solenoid 15a stops the actuating rod 15e at a predetermined position when a current in the opposite direction to the previously supplied current is not supplied.

The bias correction roller 14 and roller position adjustment means 15
constitutes belt position correction means.

When the bias correction roller 14 is disposed at the position shown in FIG. 2, the direction of correction of the position of the conveyor belt 11 is in the direction of arrow C, and
When the actuating rod 15e is moved in the direction indicated by the arrow C and the position of the bias correction roller 14 is moved, the correction direction of the conveyor belt 11 is switched to the direction opposite to the direction of the arrow C.

The sensor 22 includes a light emitting element, such as a light emitting diode 22a that emits infrared light, and a light receiving element, such as a phototransistor 22b.

The bias sensor 24 also includes a light emitting element, such as a light emitting diode 24a that emits infrared light, and a light receiving element, such as a phototransistor 24b. The detection target pieces 21 and 23 are made of aluminum foil.

The positional relationship between the detection target piece 21 and the sensor 22 is such that the toner image is not transferred to the transfer paper 3 after the toner image has been transferred to the preceding transfer paper 3, and the toner image is transferred to the following transfer paper 3. The detected piece 21 passes through a position that receives infrared rays from the light emitting diode 22a of the sensor 22 within the time until image transfer is started. When the infrared rays from the light emitting diode 22a of the sensor 220 are irradiated onto the detection target piece 21, the infrared rays reflected from the infrared rays are incident on the photodiode 22b. The positional relationship between the detected piece 23 and the low sensor 24 is such that only when the conveyor belt 11 is biased to one side, the sensor 2
20, the bias sensor 2
The detected piece 23 passes through a position receiving infrared rays from the 40-light emitting diode 24a. When the detection target piece 23 is irradiated with infrared rays from the light emitting diode 24a of the bias sensor 24, the infrared rays reflected from the infrared rays are incident on the photodiode 24b. In addition, when the conveyor belt ll is biased toward the sacrum, the detected piece 23
does not pass through the position where the bias sensor 240 receives the infrared rays from the light emitting diode 24a.

Next, a means for controlling the operation of the belt position correction means consisting of the deviation correction roller 14 and the roller position adjustment means 15 based on the output signal of the sensor 22 and the deviation sensor 24 will be explained with reference to FIG.

In FIG. 3, reference numeral 25 indicates a terminal to which a predetermined positive voltage is applied by the power supply circuit.

Between this terminal 25 and the ground, there are connected a resistor 22c and a light emitting diode 22a in series, a resistor 22d and a phototransistor 22b, and a resistor 22e and a resistor 22f.
series connected bodies are connected in parallel. The above resistance 22d
and the connection point d between the phototransistor 22b and the resistor 22
The connection point e between e and the resistor 22f is connected to the comparison circuit 22g, respectively.
is connected to the input terminal of The light emitting diode 22
The infrared rays from a are irradiated onto the detection target piece 21, reflected from the infrared rays, and incident on the phototransistor 22b, whereby the phototransistor 22 b 7! /X Only when conduction occurs, the voltage at the connection point d between the resistor 22d and the phototransistor 22b becomes lower than the voltage at the connection point e between the resistor 22e and the resistor 22f, and the comparator circuit 22g outputs a high voltage. The light emitting diode 22a, phototransistor 22b1 resistor 22C922d, 22e, 22f and comparison circuit 22
g constitutes the sensor 22 mentioned above.

Further, between the terminal 25 and the ground, there are connected a resistor 24c and a light emitting diode 24a in series, a resistor 24d and a phototransistor 24b, and a resistor 24e and a resistor 2.
4f series connected bodies are connected in parallel. Above resistance 2
The connection point f between the phototransistor 4d and the phototransistor 24b and the connection point g between the resistor 24e and the resistor 24f are connected to the comparison circuit 24, respectively.
4 connected to the input terminal of g. Only when the phototransistor 24b becomes conductive as the infrared rays from the light emitting diode 24a are irradiated onto the detection target piece 23 and reflected from the phototransistor 24b, the phototransistor 24b becomes conductive.
The voltage at the connection point f between the resistor 24d and the phototransistor 24b becomes lower than the voltage at the connection point g between the resistor 24e and the resistor 24f, and the comparator circuit 24g outputs a high voltage. The light emitting diode 24a, the phototransistor 24b1, the resistor 24
c, 24d, 24e, 24f and the comparison circuit 24g constitute the bias sensor 24.

The output terminals of the comparison circuits 22g and 24g are connected to the input terminal of an AND circuit 26.
The output terminal is the drive circuit 15 of the roller position adjustment means 15.
connected to b. The output terminal of the comparison circuit 22g is connected to the AND circuit 270 input terminal, and the output terminal of the AND circuit 26 is connected to the AND circuit 270 input terminal via the inverter 28. This AND circuit 27
The output terminal of is connected to the drive circuit 15b.

When the output voltage from the comparison circuit 22g is high and the output voltage from the comparison circuit 24g is high, the AND circuit 2
A high output voltage is given to the drive circuit 15b only from the drive circuit 6. When the output voltage from the comparison circuit 22g is high and the output voltage from the comparison circuit 24g is low, only the AND circuit 27 provides a high output voltage to the drive circuit 15b. When the output voltage of either the AND circuit 26 or 27 is high, the drive circuit 15b operates to
Although the iCt current is supplied, the direction of the current supplied to the latch node 15a differs depending on whether the output voltage of the AND circuit 26 is high or the output voltage of the AND circuit 27 is high.

Therefore, when the sensor 22 detects the detected piece 21 and the deviation sensor 24 detects the detected piece 23, the direction of correction of the deviation of the conveyor belt 11 is determined by the direction in which the sensor 22 detects the detected piece 21. , and the direction is opposite to the direction in which the deviation of the conveyor belt 11 is corrected when the deviation sensor 24 does not detect the detected piece 23, and the direction in which the deviation of the conveyor belt 11 is corrected is the time during which no toner image is transferred to the transfer paper 3. can be switched to

In addition, when the above-mentioned conveyance belt 11 has a connection part,
(conveyance bell) IIK fixed detection target piece 21 and conveyance bell)
By adjusting the relative positional relationship of the connecting portions of the conveyor belt 11, it is possible to prevent the transfer paper 3 from being placed on the connecting portions of the conveyor belt 11. Like this conveyor bell) 11
If the transfer paper 3 is not placed on the connecting portion of the conveyor belt 11, the toner image will not be transferred to the transfer paper 31C at the connecting portion of the conveyor belt 11. can be prevented from giving.

Effects In the transfer paper conveyance device of the present invention, when the belt position correction means corrects the deviation 1) in the position of the conveyance belt, the direction of correction of the position of the conveyance belt is switched during a time when no toner image is transferred to the transfer paper. Does not adversely affect the transfer of toner images to transfer paper.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a part of an electronic copying machine having a transfer paper conveyance device of the present invention, FIG. 2 is a partially cutaway perspective view showing the transfer paper conveyance device of the present invention, and FIG. FIG. 3 is an electric circuit diagram showing a means for controlling the operation of a belt position correcting means of the transfer paper conveying device. 1st work: Conveyor belt, 14: Unbalance correction roller,
15...Roller position adjustment means, 21.23...Detected piece, 22...Sensor, 24...Bias sensor agent Fumoto Takashi Akira 35

Claims (1)

[Claims] Transfer paper that transports the transfer paper sent from the paper feeding device between the photoreceptor and the transfer device using a loop-shaped transport belt, and transports the transfer paper with the toner image on the photoreceptor to the fixing device. In the conveying device, during a time when the toner image is not transferred to the transfer paper, it is detected that the position of the conveying belt is deviated from the proper position, and the direction of correction of the upward position of the conveying belt is switched. transfer paper conveyance device.