WO2014187228A1

WO2014187228A1 - Processing box and laser flatbed printer

Info

Publication number: WO2014187228A1
Application number: PCT/CN2014/076491
Authority: WO
Inventors: 苏健强; 何永刚
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2013-05-21
Filing date: 2014-04-29
Publication date: 2014-11-27
Also published as: CN103268062B; CN103268062A

Abstract

A processing box and a laser flatbed printer. The processing box comprises a box body (104), wherein a toner cartridge (101) and a photosensitive drum (103) are provided in the box body (104). A transfer roller (105) is also arranged on the processing box. When it is seen from the cross section, the circumferential surface of the transfer roller (105) from the position where the photosensitive drum (103) accepts toner to the position where the toner is transferred to a print medium (3) is a charged region (1051), and the circumferential surface returning to the photosensitive drum (103) from the print medium (3) is an uncharged region (1052). The charged region (1051) has charges that are contrary to the polarity of the toner on the photosensitive drum (103). A charging device is also arranged on the processing box, so as to charge the charged region (1051).

Description

Processing box and laser flatbed printer

The present invention relates to a laser flatbed printer dedicated to printing a plate-shaped medium and a process cartridge for use in the laser flatbed printer. The present invention is based on a Chinese patent application filed on May 21, 2013, with the application number 201310189856.3, the content of which is hereby incorporated by reference.

A laser printer generally refers to a device that prints toner on a medium such as paper by electrophotographic principle. The main structure of the laser printer can be illustrated by FIG. 4, and a medium conveying system is provided in the body, which makes the paper from the paper box. A set of mechanisms that are transported to the imaging area and sent out after imaging. The key part of the imaging area is the process cartridge 100. The process cartridge 100 is detachably mounted in the laser printer relative to the laser printer. The following is only for the process cartridge 100. The portion related to the imaging operation in cooperation with the process cartridge 100 will be described. A transfer roller 200, a fixing roller 300, and a pressure roller 400 are provided in the medium conveying system. The process cartridge 100 is formed with a powder compartment 101 in its casing. The powder compartment 101 stores toner for imaging, and the casing is also provided with components such as a developing roller 102 and a photosensitive drum 103. When the photosensitive drum 103 is driven by a laser printer. When rotating in the direction of the arrow shown in FIG. 4, the electrostatic latent image region formed on the circumferential surface of the photosensitive drum 103 receives the toner transferred from the developing roller, and transfers the image formed by the toner under the action of the transfer roller 200. The paper 500 is then passed through the fixing roller 300 and the pressure roller 400 to form an image firmly formed on the paper 500.

The printing medium of the conventional laser printer is paper, and its medium conveying system is designed according to the flexibility of the paper, and recently, printing patterns and characters are produced on rigid plate members such as glass, metal, ceramics and plastics. The demand for laser flatbed printers has been created. The laser imaging apparatus disclosed in the Chinese Patent Application Publication No. CN102608888A includes a laser flatbed printer. As shown in the first embodiment, see FIG. 5 of the present application, FIG. The laser flatbed printer does not improve the conventional process cartridge, but only improves the characteristics of the media transport system for the rigid panel. Such a laser flatbed printer has the following drawbacks. First, the print surface of the print medium 800 needs to be performed. Pre-printing processing, that is, forming a conductive coating on the printing surface, and also providing the transfer electrodes 600, 700 in the laser flatbed printer, results in a complicated structure of the laser flatbed printer, and the image quality is not ideal. Another laser flatbed printer is also disclosed in CN102608888A, as its second embodiment, see Fig. 6 of the present application. In the laser flatbed printer 1 illustrated in Fig. 6, the structure of the process cartridge 100 is also unchanged, but only for the laser flat panel. The inside of the printer 1 has been modified in that the photosensitive drum 103 first forms an image on the printing paper 801, and then transfers it to the plate-shaped printing medium 800 by the printing paper 801. Such a laser flatbed printer also requires a conductive coating on the printing surface of the printing medium, and there is also a problem of pre-processing the plate-shaped printing medium.

The main object of the present invention is to provide an improved process cartridge;

Another object of the present invention is to provide an improved laser flatbed printer.

In order to achieve the above main object, the process cartridge provided by the present invention comprises a casing in which a powder silo for containing toner is formed and a photosensitive drum is mounted. A transfer roller is further disposed on the process cartridge, and the transfer roller is disposed in parallel with the axis of the photosensitive drum, and the transfer roller receives the toner from the photosensitive drum to the circumferential direction where the toner is transferred to the printing medium as viewed from a cross section The surface is a charged area, and the circumferential surface returning from the printing medium to the photosensitive drum is an electroless area having a charge opposite to the polarity of the toner on the photosensitive drum. A charging device is also disposed on the process cartridge for charging the charged area.

A specific solution is that the transfer roller comprises a shaft core and a rotating sleeve, and the shaft core is fixed on the box body, and the rotating sleeve is rotatable relative to the shaft core. The charging device includes a charging grid disposed on the core, facing the charged region, and a charging wire on a side of the charging grid facing away from the charged region.

More specifically, the charging device further includes a discharge grid disposed on the core, facing the non-electrical region, and a discharge wire on a side of the discharge grid facing away from the non-electrical region.

Another specific solution is that the charging device includes a charging grid fixed to the casing, a charging grid facing the charging region, and a charging wire on a side of the charging grid facing away from the charging region.

More specifically, the charging device further includes a discharge grid fixed to the casing, facing the non-electrical region, and a discharge wire located on a side of the discharge grid facing away from the non-electrical region.

In the above aspect, it is also possible to apply a layer of fluororesin to the circumferential surface of the transfer roller. A cleaning roller that is in contact with the non-electrical area is also mounted on the casing.

In order to achieve another object of the present invention, a laser flatbed printer provided by the present invention comprises a casing and a set of medium driving rollers, at least a part of which is mounted in the casing, and the axes are in the same plane, and a process cartridge is processed. The cartridge includes a cartridge body in which a powder compartment containing toner is formed, and a photosensitive drum is mounted. The process cartridge is detachably mounted within the housing and above a set of media drive rollers, and a vertical transfer gap between the process cartridge and a set of media drive rollers forms a media transfer passage. The media carrier, which can be driven by a set of media drive rollers, travels through the media transport path. Further comprising a transfer roller disposed on the casing in parallel with the axis of the photosensitive drum, the transfer roller receiving the toner from the photosensitive drum to the circumferential direction of transferring the toner to the printing medium as viewed in cross section The surface is a charged area, and the circumferential surface returning from the printing medium to the photosensitive drum is an electroless area having a charge opposite to the polarity of the toner on the photosensitive drum. A charging device for charging a charged area.

A specific solution is that the laser flatbed printer further includes a heating member fixed in the casing upstream of the medium conveying passage; and a fixing roller located above the medium conveying passage. The upper surface of the media tray is provided with a heating layer.

More specifically, the transfer roller includes a shaft core and a rotating sleeve, and the shaft core is fixed on the casing, and the rotating sleeve is rotatable relative to the shaft core. The charging device includes a charging grid disposed on the core, facing the charged region, and a charging wire on a side of the charging grid facing away from the charged region. A discharge grid disposed on the core, facing the non-electrical region, and a discharge wire on a side of the discharge grid facing away from the non-electrical region.

Another more specific solution is that the charging device includes a charging grid fixed to the casing, a charging grid facing the charged region, and a charging wire on a side of the charging grid facing away from the charged region. It is fixed on the casing, facing the discharge grid of the non-electrical area and the discharge wire located on the side of the discharge grid facing away from the non-electrical area.

The beneficial effects of the present invention are that there is no need for pre-treatment of the conductive coating of the printing medium.

1 is a schematic structural view of an embodiment of a laser flatbed printer according to the present invention, which includes a schematic structural view of a first embodiment of the process cartridge of the present invention;

Figure 2 is a partial enlarged view of A in Figure 1;

Figure 3 is a partial enlarged view of a second embodiment of the process cartridge of the present invention;

4 is a schematic structural view of a conventional laser printer;

Figure 5 is a schematic structural view of a conventional laser flatbed printer;

Fig. 6 is a schematic structural view of another conventional laser flatbed printer.

The invention will now be further described in conjunction with the various embodiments and the accompanying drawings.

The embodiment of the process cartridge of the present invention can be fully realized by the description of the embodiment of the laser flatbed printer. Therefore, only the embodiments of the two laser flatbed printers will be described in detail below.

Laser tablet printer embodiment

Referring to Fig. 1, in order to explain the problem in a simple and clear manner, only the portion closely related to the present invention is shown in Fig. 1, and the same structure as the prior art is omitted. The three media drive rollers 1 are supported in the housing of the laser flatbed printer, and in the same plane are other media drive rollers arranged in parallel with the axis, which can be arranged along the media inlet and the media outlet extending to the housing. The medium tray 2 is used to carry the printing medium 3, and the upper surface of the medium tray 2 is provided with a heating layer 4, which can be made of any existing electrothermal material. After the process cartridge 100 is installed in position, the lowest point of the transfer roller 105 in the circumferential direction will be located at a level slightly lower than the upper surface of the printing medium 3, such that when the media tray 2 carrying the printing medium 3 is shown in FIG. When the upstream (left end) travels downstream (right end), the transfer roller 105 will press against the printing surface of the printing medium. Obviously, such a requirement can be adjusted by the size of the medium carrier in the height direction of the medium conveying path. Simply implemented.

A heating member 5 is further disposed in the casing of the laser flatbed printer, and the heating member 5 is fixed in the housing upstream of the traveling direction of the medium tray 2 and above the medium conveying passage for performing the printing surface of the printing medium 3. Pre-heating before printing.

A fixing roller 6 is further disposed in the housing of the laser flatbed printer, and the fixing roller 6 is rotatably fixed in the housing downstream of the traveling direction of the medium tray 2 and above the medium conveying path for the printing medium 3 Fixing more reliably after imaging.

The structure of the process cartridge used in the present embodiment will be explained in the first embodiment of the process cartridge and the second embodiment of the process cartridge.

Processing box first embodiment

Referring to FIG. 1 and FIG. 2, a cartridge 101 is formed in the casing 104 of the process cartridge 100. A developing roller 102 is mounted at the outlet of the powder cartridge, and a photosensitive drum 103 is mounted in the casing 104. Like the conventional process cartridge, the process cartridge 100 is further provided with a stirring frame in the powder compartment 101, a charging roller and a cleaning blade are mounted around the photosensitive drum, and a powder discharging knife is also installed at the developing roller 102. The prior art is the same. The difference is that a transfer roller 105 and a cleaning roller 106 are further mounted on the casing 104, and the transfer roller 105 is disposed in such a manner that its axis is parallel to the axis of the photosensitive drum 103, and the circumferential surface of the transfer roller 105 is coated. There is a layer of fluororesin. The transfer roller 105 includes a shaft core 151 fixed relative to the casing 104 and a rotating sleeve 152 rotated relative to the shaft core 151. The charging core grid and the discharge grid plate are disposed in the shaft core 151. In this example, the charging grid and the discharge grid The plate constitutes a cylindrical core 151, and the rotating sleeve 152 is divided into a receiving surface from the photosensitive drum 103 to the circumferential surface where the toner is transferred to the printing medium 3, that is, the charged region 1051 shown in Fig. 2, and The printing medium 3 is returned to the circumferential surface at the photosensitive drum 103, that is, the electroless region 1052, and further, a charging wire 1511 and a discharge wire 1512 are disposed in the core 151. The cleaning roller 106 is disposed on the side of the dead zone 1052. All the rotating members in the process cartridge 100, i.e., the respective rollers and the agitating frame, are operated by a gear train provided on the side wall of the casing 104, that is, the axial end portions of the respective rollers, as in the prior art. The electroless region referred to in the present invention means that the discharge wire 1512 is charged to the electroless region through the discharge grid to a polarity opposite to that of the charged region, thereby achieving the technical effect of making the transfer roller working surface electrically neutral in the non-electric region. .

The working principle of the laser flatbed printer embodiment and the first embodiment of the process cartridge of the present invention will be described below with reference to Figs. 1 and 2. When the media tray 2 carrying the printing medium 3 is placed from the entrance of the laser flatbed printer, the heating layer 4 is electrically preheated to the printing medium, the heating member 5 also starts to emit heat, and then the medium driving roller 1 is rotated, and the medium tray is rotated. The frame 2 is operated from left to right as shown in Fig. 1. When the front end 31 of the printing medium 3 is run under the heating member 5, the heating member 5 rapidly heats the upper surface of the printing medium 3, and the current end 31 runs to the fast and transfer roller. When the 105 is in contact, the process cartridge 100 starts to operate, and the charging wire 1511 charges the charging region 1051 with the opposite charge of the toner on the photosensitive drum 103 through the charging grid, so that the toner on the photosensitive drum 103 is adsorbed to the charged region by the transfer roller 105. When the toner on the transfer roller 103 is as fast as the contact with the printing medium 3, the boundary between the charged area and the non-electrical area has been reached. Since entering the non-electrical area, the toner has no adsorption force, and the current end 31 and When the transfer roller 105 is pressed into contact, the toner is fixed on the printing medium 3, and an image is formed on the printing medium 3, and further fixed by the fixing roller 6, so that the image is more stable on the printing medium 3.

Processing box second embodiment

The structure of the second embodiment of the process cartridge of the present invention is substantially identical to that of the first embodiment of the process cartridge, and only the differences between the transfer roller and the charging device will be described below.

Referring to Fig. 3, in this embodiment, the transfer roller 105 is composed of a shaft core and a sleeve fixed to the outside of the shaft core, and is relatively fixed therebetween, and is rotatably fixed to the casing 104 through the shaft core. The charging device in this example is composed of a charging wire 1511 and a charging grid 1513, a discharge wire 1512 and a discharge grid 1514, which are both fixed on the casing 104, and the transfer roller 105 is rotated during operation to be transferred to the receiving photosensitive drum 103. The area where the upper toner is placed to release the toner to the printing medium 3 is the charged area 1051, and the area where the toner is released to return to the photosensitive drum 103 is the dead area 1052. The advantage of the first embodiment of the present embodiment relative to the process cartridge is that since the charging device is disposed outside the transfer roller 105, the structure of the transfer roller 105 is relatively simple, and the electrical connection of the charging device is relatively simple.

It can be seen from the above embodiment that the charged area of the transfer roller has a charge opposite to the polarity of the toner on the photosensitive drum, and the toner on the photosensitive drum can be transferred to the transfer roller and adsorbed thereon, when the toner is transferred When it is adjacent to the printing medium, the toner loses its adsorption force due to entering the electroless area, that is, it is transferred to the printing medium.

Claims

Processing box, including

a cartridge body having a powder compartment for containing toner and having a photosensitive drum mounted thereon;

It is characterized by:

a transfer roller disposed on the casing in parallel with the axis of the photosensitive drum, the transfer roller receiving the toner from the photosensitive drum to transfer the toner to the printing medium as viewed in a cross section The circumferential surface is a charged area, and the circumferential surface returning from the printing medium to the photosensitive drum is an electroless area having a charge opposite to the polarity of the toner on the photosensitive drum;

A charging device for charging the charged area.
The process cartridge according to claim 1, wherein:

The transfer roller includes a shaft core and a rotating sleeve, the shaft core is fixed on the casing, and the rotating sleeve is rotatable relative to the shaft core;

The charging device includes a charging grid disposed on the core, facing the charged region, and a charging wire on a side of the charging grid facing away from the charged region.
The process cartridge according to claim 2, wherein:

The charging device further includes a discharge grid disposed on the shaft core opposite to the electroless region and a discharge wire located on a side of the discharge grid facing away from the non-electrical region.
The process cartridge according to claim 1, wherein:

The charging device includes a charging grid fixed to the casing, a charging grid facing the charging region, and a charging wire located on a side of the charging grid facing away from the charging region.
A process cartridge according to claim 4, wherein:

The charging device further includes a discharge grid fixed to the casing, facing the electric-free area, and a discharge wire located on a side of the discharge grid facing away from the non-electrical region.
A process cartridge according to any one of claims 1 to 5, wherein:

The circumferential surface of the transfer roller is coated with a layer of fluororesin;

A cleaning roller that is in contact with the electroless region is also mounted on the casing.
Laser tablet printer, including

case;

a set of media driven rollers, at least a portion of which are mounted within the housing with the axes in the same plane;

a process cartridge comprising a box body having a powder compartment for containing toner and having a photosensitive drum mounted thereon;

The process cartridge is detachably mounted in the housing and located above the set of media drive rollers, and a gap between the process cartridge and the set of media drive rollers forms a medium transfer passage in a vertical gap ;

a media carrier driveable by the set of media drive rollers to travel in the media transport path;

It is characterized by:

a transfer roller disposed on the casing in parallel with the axis of the photosensitive drum, the transfer roller receiving the toner from the photosensitive drum to transfer the toner to the printing medium as viewed in a cross section The circumferential surface is a charged area, and the circumferential surface returning from the printing medium to the photosensitive drum is an electroless area having a charge opposite to the polarity of the toner on the photosensitive drum;

A charging device for charging the charged area.
A laser flatbed printer according to claim 7, wherein:

Also included is a heating member fixed in the housing upstream of the medium conveying passage; a setting roller located above the medium conveying passage;

The upper surface of the media tray is provided with a heating layer.
A laser flatbed printer according to claim 7 or 8, wherein:

The transfer roller includes a shaft core and a rotating sleeve, the shaft core is fixed on the casing, and the rotating sleeve is rotatable relative to the shaft core;

The charging device includes a charging grid disposed on the shaft core, facing the charging region, and a charging wire on a side of the charging grid facing away from the charging region;

a discharge grid disposed on the shaft core opposite to the electroless region and a discharge wire on a side of the discharge grid facing away from the non-electrical region.
A laser flatbed printer according to claim 7 or 8, wherein:

The charging device includes a charging grid fixed to the casing, a charging grid facing the charging region, and a charging wire located on a side of the charging grid facing away from the charging region;

a discharge grid fixed to the casing, facing the electric-free area, and a discharge wire located on a side of the discharge grid facing away from the non-electrical region.