KR20000002630A - Transcribing roller cleaning device of printer and operating method therof - Google Patents

Abstract

PURPOSE: A transcribing roller cleaning device of a printer and the operating method thereof is provided to remove a residue. CONSTITUTION: A transcribing roller cleaning device which can be engaged with and disengaged from the transcribing roller(21) comprises; a cleaning roller(31) having an adsorbing agent to adsorb developer remaining on the transcribing roller(21); a driving part to engage and disengage the cleaning roller with and from the transcribing roller; and a surface pollution detector(32) to inspect the soil on the transcribing roller(21).

Description

Transfer roller cleaning device for printer and its driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer roller cleaning apparatus for a printing press and a driving method thereof, and more particularly, to a transfer roller cleaning apparatus for a printing press for removing a developer remaining on a transfer roller without being transferred to a recording paper and a driving method thereof.

In general, an electrophotographic printing machine such as a laser printer or a copier has a photoreceptor for forming an electrostatic latent image by exposure to a photosensitive belt or photosensitive drum, and a electrostatic latent image formed on the photosensitive medium with a developer such as toner or liquid ink. A developing device for developing and a transfer device for transferring an image formed of a developer on a photosensitive medium onto a sheet while rotating in contact with the photosensitive medium are provided.

The general transfer apparatus is provided with a transfer roller provided to be in contact rotation with the photosensitive medium, and a fixing roller installed on the transfer roller to pressurize and advance the transfer roller and the paper drawn therebetween.

In order to enable continuous printing by the repetitive repetition of the photosensitive medium, such a printing machine is 100% from the transfer roller and the transfer roller which transfers the image transfer from the photosensitive medium to the recording paper. It must be transferred.

However, 100% transfer of the developer that forms the image from the transfer roller to the recording paper during the transfer process is practically difficult, and after a transfer process from the transfer roller to the paper, there is a slight difference, but a small amount of developer is transferred to the transfer roller. Will remain.

Residual developer, which is not removed from the transfer roller after the transfer process of the transfer roller to the paper, interlocks with the rotating photosensitive medium and prevents the formation of a new image, thereby degrading the print image.

The present invention has been made to solve the above problems, and an object thereof is to provide a transfer roller cleaning apparatus and a driving method thereof of a printing press capable of removing a developer remaining after an image transfer process on a transfer roller.

1 is a view schematically showing a transfer roller cleaning apparatus of a printing press according to the present invention,

2 is a flowchart illustrating a method of driving the cleaning apparatus of FIG. 1.

<Description of the reference numerals for the main parts of the drawings>

11, 12, 13: roller 14: photosensitive belt

15: reset device 16: optical scanning device

17: developing unit 18: drying apparatus

20: transfer device 21: transfer roller

22: fixing roller 23: recording paper

30: cleaning device 31: cleaning roller

31a: absorbent material layer 32: surface contamination inspection unit

32a: light source 32b: photodetector

33: control unit 34: drive unit

In order to achieve the above object, the transfer roller cleaning apparatus of the printing press according to the present invention is detachably installed on a transfer roller which is rotated in engagement with the photosensitive belt to move an image formed of a developer on the photosensitive belt, and the transfer on the surface thereof. A cleaning roller provided with an adsorption material for adsorbing the developer remaining on the roller, a driving unit for contacting and separating the cleaning roller from the transfer roller, and a degree of contamination by the deposition amount of the developer on the surface of the transfer roller are examined. And a control unit for controlling the driving unit for contacting and separating the cleaning roller from the transfer roller by grasping a signal provided from the surface contamination state inspection unit and outputting a signal corresponding thereto.

Preferably, the surface contamination state inspection unit receives a light source for irradiating the surface of the transfer roller, the light irradiated from the light source and reflected from the surface of the transfer roller and outputs a signal corresponding thereto to the controller. It has a photodetector.

In addition, the driving method of the transfer roller cleaning apparatus for achieving the above object comprises the steps of measuring the surface contamination of the transfer roller; Determining whether the surface contamination of the transfer roller has exceeded a set allowable upper limit criterion; If the surface contamination of the transfer roller exceeds the set upper limit standard in the determining step, the cleaning roller is brought into contact with the transfer roller to clean the surface of the transfer roller, and the transfer roller and the cleaning roller are rotated with each other. Performing a cleaning operation, and determining whether the surface contamination of the transfer roller has reached a set allowable lower limit standard by performing the cleaning operation; And removing the cleaning roller from the transfer roller to terminate the cleaning operation when the surface contamination degree of the transfer roller reaches the set lower limit standard.

Hereinafter, with reference to the accompanying drawings will be described in more detail the transfer roller cleaning apparatus of the printing press according to the present invention.

1 is a view schematically showing a transfer roller cleaning apparatus of a printing press according to the present invention.

Referring to the drawings, the printer is a reset device 15, the optical scanning device 16, the developer 17 along the circular track of the photosensitive belt 14 circulated by the rollers (11) (12) (13) ), A drying apparatus 18, a transfer apparatus 20, and a transfer roller cleaning apparatus 30.

The reset device 15 provided between the transfer device 20 and the optical scanning device 16 erases the electrostatic latent image formed on the photosensitive belt 14 and initializes the new electrostatic latent image so that a new electrostatic latent image can be written. It has a charger 15b.

The optical scanning devices 16 scan the light corresponding to the image information to the photosensitive belt 14 to form an electrostatic latent image, and the developing units 17 supply a developer onto the photosensitive belt 14 to develop the electrostatic latent image. .

The drying apparatus 18 is applied to a wet printer using ink as a developer. The drying apparatus 18 includes a liquid carrier element that does not participate in image formation among the ink supplied from the developer 17 onto the photosensitive belt 14. ) To separate by adsorption.

The transfer apparatus 20 is provided with a transfer roller 21 and a fixing roller 22 to transfer the image formed of the toner developer on the photosensitive belt 14 onto the inserted sheet 23.

The cleaning apparatus 30 according to the present invention includes a cleaning roller 31, a surface contamination state inspection unit 32, a control unit 33, and a driving unit 34.

The cleaning roller 31 has a cylindrical rod 31b and an adsorption material layer 31a wrapped around the outer circumferential surface of the rod 31b. The adsorption material layer 31a is formed of an adsorption material such as cloth which can separate the toner as a developer from the transfer roller 21 by adsorption. The cleaning roller 31 is positioned off the image transfer path from the photosensitive belt 14 to the inserted recording paper 23 so that the cleaning operation can be performed while the transfer roller 21 is rotated for image transfer. The paper 23 is provided at a position where it can be contacted / separated from the transfer roller 21 in a direction opposite to the direction in which the transfer roller 21 enters the transfer roller 21. The cleaning roller 31 may be driven by a separate power source in a state where the contact with the transfer roller 21 is maintained, or may be driven in conjunction with the rotation of the transfer roller 21 without a separate power source.

The surface contamination inspection unit 32 checks the degree of contamination on the surface of the transfer roller 21 after the image transfer and leaves the developer and provides it to the controller 33. The surface contamination state inspection unit 32 for contamination inspection receives a light source 32a for irradiating light onto the surface of the transfer roller 21 and a light reflected from the surface of the transfer roller 21 to control a signal corresponding thereto. It has the photodetector 32b output to 33. As shown to FIG. The surface contamination inspection unit 32 provides contamination information by using a principle in which reflectance is changed according to a developer attached to the surface of the transfer roller 21.

The drive unit 34 has a structure and a power source that interfere with the cleaning roller 31 so that the cleaning roller 31 can be contacted and separated from the transfer roller 21. The drive unit 34 for allowing the cleaning roller 31 to be repositioned to each position in contact with and separated from the transfer roller 21 can be implemented by various methods, and can simply rotate the cleaning roller 31. It may be provided with a cylinder (not shown) coupled with the support arm (31c) so that the support arm (31c), which is being supported, can be advanced by power. Alternatively, the driving part 34 is installed to interpose the support arm 31c so as to advance and retract the support arm 31c and to switch the cleaning roller 31 to the contact and separation positions of the transfer roller 21, respectively. A cam member (not shown) and the motor for rotating a cam member may be comprised.

The operation of the drive unit 34 is controlled by the control unit 33.

The control unit 33 judges the contamination level of the transfer roller 21 from the signal provided from the photodetector 32b, and when the cleaning roller 31 exceeds the allowable contamination standard range, the cleaning roller 31 is in contact with the transfer roller 21. The driving of the driving unit 34 is instructed to rotate while being maintained. The control unit 33 stores the upper and lower limit values for the allowable contamination so as to determine whether the contamination value of the transfer roller 21 is outside the allowable range from the signal provided from the photodetector 32b. The upper limit and lower limit reference values are obtained by experiment. Here, the upper limit reference value is determined at a level where the degree of contamination has little influence on the print quality, and the lower limit reference value is determined at a level of fine contamination close to the state in which the contamination is completely removed or the contamination is completely removed.

As a method for effectively using the cleaning device 30 as described above, the cleaning roller 31 is cleaned by the cleaning roller 31 only when the degree of contamination of the transfer roller 21 reaches a predetermined level that affects the print quality. Wear of the surface of the transfer roller 21 and the absorber material layer 31a due to unnecessary driving during power saving and image transfer are not performed rather than being driven at all times when the transfer roller 21 is rotated by performing the operation. The driving method of the cleaning apparatus 30 for suppressing the reduction of the service life according to the following will be described in detail with reference to FIG. 2.

First, the surface contamination state inspection unit 32 is to be operated at all times when the power supply to the printer to provide information on the surface contamination of the transfer roller (21). The control unit 33 reads a signal output from the surface contamination state inspection unit 32 that continuously provides surface contamination state information of the transfer roller 21 while the power is turned on, and measures the surface contamination of the transfer roller 21. (Step 100).

Next, the control unit 33 determines whether the surface contamination degree of the transfer roller 21 has exceeded the set allowable upper limit criterion (step 110). If the signal output from the photodetector 32b of the surface contamination state inspection unit 32 in the determination process (Step 110) is a value that is less than the upper limit of the contamination allowance obtained by experimental measurement, the surface contamination of the transfer roller 21 is The control unit 33 continues to monitor until the pollution allowable upper limit is reached, and the process of determining whether the set allowable upper limit criteria is reached is repeated. In this determination process, when the surface contamination degree of the transfer roller 21 reaches the set allowable upper limit criterion, the cleaning roller 31 controls the drive unit 34 to clean the surface of the transfer roller 21 so that the cleaning roller 31 transfers the transfer roller 21. The position of the cleaning roller 31 is moved so that the contact can be maintained, so that the cleaning operation is performed by rotation of the transfer roller 21 and the cleaning roller 31 by mutual contact (step 120).

While continuing the cleaning operation (step 120), it is determined from the information provided from the surface contamination state inspection unit 32 whether the surface contamination degree of the transfer roller 21 reaches the set allowable lower limit standard (step 130).

When the surface contamination degree of the transfer roller 21 reaches the set lower limit standard, the position of the cleaning roller 31 is moved so that the cleaning roller 31 is separated from the transfer roller by the driving of the drive unit 34 (step 140 ). Subsequently, the control unit 33 repeats the step 110 of monitoring the information provided to the surface contamination state inspection unit 32 to monitor whether the surface contamination of the transfer roller reaches the set upper limit limit.

In the example described so far, the cleaning object has been limited to the transfer roller 21, but the photosensitive belt 14 which has finished transferring the image of the transfer roller 21 at a predetermined position between the transfer roller 21 and the reset device 15 is described. It can be installed and used to remove the developer remaining in the phase.

As described so far, according to the transfer roller cleaning apparatus of the printing press and the driving method thereof, the cleaning roller is in contact with the transfer roller until it reaches the set lower limit only when the surface contamination of the transfer roller reaches the set upper limit. Driven to rotate, it is possible to maintain the print quality within a certain range, as well as wear of the surface of the transfer roller and the absorbent material layer due to unnecessary driving during power saving and image transfer is not performed than the regular driving of the cleaning roller. Can shorten the lifespan.

Claims (3)

A cleaning roller detachably installed on a transfer roller which is rotated in engagement with the photosensitive belt to move an image formed of a developer on the photosensitive belt, and an adsorption material for adsorbing the developer remaining on the transfer roller; A driving unit for contacting and separating the cleaning roller from the transfer roller; A surface contamination state inspection unit which inspects the contamination level by the adhesion amount of the developer on the surface of the transfer roller and outputs a signal corresponding thereto; And a control unit which grasps a signal provided from the surface contamination state inspection unit and controls the driving unit for contacting and detaching the cleaning roller to the transfer roller. The method of claim 1, The surface contamination state inspection unit and a light source for irradiating light to the surface of the transfer roller; And a photodetector configured to receive light reflected from the light source and reflected from the surface of the transfer roller, and output a signal corresponding thereto to the control unit. A cleaning roller detachably mounted to a transfer roller which rotates in engagement with the photosensitive belt to transfer an image formed of a developer on the photosensitive belt, a driving unit for contacting and separating the cleaning roller from the transfer roller, and the surface of the transfer roller surface Surface contamination inspection unit for inspecting the degree of contamination by the adhesion amount of the developer and outputs a signal corresponding thereto, and grasps the signal provided from the surface contamination inspection unit for contact and separation of the cleaning roller to the transfer roller In the driving method of the transfer roller cleaning apparatus of the printing machine having a control unit for controlling the drive unit, end. Measuring the surface contamination of the transfer roller; I. Determining whether the surface contamination of the transfer roller has exceeded a set allowable upper limit criterion; All. If the surface contamination of the transfer roller in the step B exceeds the set upper limit, the cleaning roller is brought into contact with the transfer roller to clean the surface of the transfer roller, and the transfer roller and the cleaning roller are rotated to each other. Performing a cleaning operation; la. Judging whether the surface contamination of the transfer roller has reached a set lower limit standard through the multi-step; hemp. And removing the cleaning roller from the transfer roller and ending a cleaning operation when the surface contamination degree of the transfer roller reaches the set lower limit standard in the step d) of the transfer roller cleaning apparatus of the printing machine. Driving method.