JPH0348601Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a developer squeezing roller device for an electrophotographic engraving machine.

Generally, in electrophotographic engraving machines that charge, expose, develop, and fix photosensitive paper, a developer squeezing roller device is provided on the exit side of the developing section to squeeze out the developer from the photosensitive paper sent out from the developing section. ing. A squeezing roller device usually has a lower drive roller and an upper presser roller whose surface is coated with a rubber layer. The photosensitive paper is pinched and sent to the fixing section. Since the surface of the upper presser roller becomes dirty due to adhesion of developer and photosensitive agent, it is necessary to periodically clean the upper presser roller. For this reason, conventionally, the entire support box with both rollers attached could be removed from the main body of the electrophotographic engraving machine.
In addition to the complicated structure, the entire support box was heavy, making it difficult to take it in and out.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a squeeze roller device with a simple structure in which the upper presser roller can be easily taken out from the main body of an electrophotographic engraving machine.

An embodiment of the present invention will be described below with reference to the drawings.

1 to 9 show an embodiment of the present invention. Referring to FIG. 1, a document table 2 is fixed to the top surface of the electrophotographic engraving machine main body 1.
A paper feeding section 3 and a charging section 4 are provided at one end of the electrophotographic engraving machine main body 1, and a developing section 5 and a fixing section 6 are provided at the other end. A scanning box 7 is provided below the document table 2 and is movable parallel to the document table 2.The scanning box 7 is moved by a motor 8 at a constant speed from the charging section 4 side to the developing section 5 side. and is moved backward from the developing section 5 side to the charging section 4 side.

The scanning box 7 is provided with an optical exposure system 9 equipped with a focusing light transmitter and an odd-numbered reflecting mirror. Two roller devices 11, 12 for feeding the photosensitive paper 10 in the same direction at twice the speed
is installed. The roller devices 11 and 12 include main rollers 13 and 14, and main rollers 13 and 12, respectively.
Presser roller 15,1 pressed against the upper surface of 14
6, the photosensitive paper 10 has a main roller 13,
14 and presser rollers 15 and 16, it is held between the front and rear of the optical exposure system 9. When the scanning box 7 moves forward, the main rollers 13 and 14
rotates with a circumferential speed equal to its moving speed. On the photosensitive surface of the photosensitive paper 10 held between both roller devices 11 and 12, an erect, same-size real image of the surface of the document on the document table 2 is formed by the optical exposure system 9.

A paper feed roller device 18 driven by a motor 17 is provided in the paper feed section 3, and roller devices 19 and 20 are provided on the entrance side of the charging section 4 and the entrance side of the developing section 5, respectively. A squeeze roller device 21 is provided on the exit side of the developing section 5, and a paper discharge roller device 22 is provided on the exit side of the fixing section 6. The roller devices 19-22 are driven by a motor 23. The conveyance speed of the photosensitive paper 10 by the roller devices 18 to 22 is set to be approximately equal to the conveyance speed of the photosensitive paper 10 by the roller devices 11 and 12. The photosensitive paper 10 in the paper feed section 3 is fed out one by one by the paper feed roller device 18, and
9 into the charging section 4. When the start sensor 24 provided on the entrance side of the charging section 4 detects the photosensitive paper 10, a voltage is applied to the charging section 4, and the photosensitive paper 10 in the charging section 4 is charged with a negative charge.

The front end of the photosensitive paper 10 sent out from the charging section 4 is held between the roller devices 11 and 12 of the scanning box 7, which has already started moving, so that the speed of the scanning box 7 is 2
Moves forward at twice the speed. After the scanning box 7 starts moving, the exposure lamp of the optical exposure system 9 is turned on, and an erected real image of the document surface is formed on the photosensitive surface of the photosensitive paper 10.

The front end of the photosensitive paper 10 fed out from the roller device 12 is held by a roller device 20 on the entrance side of the developing section 5 and guided to the developing section 5.

Referring to FIGS. 2 to 5, the developing section 5
includes a lower electrode plate 25 and an upper electrode plate 26, and a photosensitive paper passage 27 is formed between both electrode plates 25 and 26. A developer supplying device 28 is provided on the entrance side of the photosensitive paper passage 27 to cause the developer to flow out into the photosensitive paper passage 27 . Lower electrode plate 2
A mesh plate 29 is disposed on the upper surface of the photosensitive paper 5 for guiding the developer to the lower side of the photosensitive paper 10.

The developer supply device 28 has a cylindrical main body 30 having a substantially rectangular cross section with both ends open.
End plates 31 and 32 are removably attached to both ends of 0. One end of a developer supply pipe 33 is connected to one end plate 31 , and the other end of this developer supply pipe 33 is connected to a developer tank 34 . The developer in the tank 34 is pumped by a pump 35.
The developer is fed into the cylindrical main body 30 via the developer supply pipe 33.

A relatively wide slit 36 is formed in the lower portion of the cylindrical body 30 and extends in the longitudinal direction. The cylindrical main body 30 having such a shape can be mass-produced with high precision and at low cost by extrusion molding of aluminum.

An outlet width adjustment plate 37 is provided on the front side of the cylindrical main body 30.
is attached so that its position can be adjusted up and down. The developer outlet width D of the cylindrical main body 30 is adjusted to about 1 mm by the outlet width adjusting plate 37.

A porous or mesh filter 38 is inserted inside the cylindrical main body 30 . This filter 3
8 is for allowing the developer to flow out evenly from the developer outlet over the entire length of the developer outlet;
The developer that has entered the cylindrical body 30 passes through a filter 38 and is led to the photosensitive paper passage 27 from a developer outlet. The filter 38 is provided with a porous or net-like weir plate 39 that extends in a direction that blocks the lower side of the opening of the developer supply pipe 33 . This weir plate 39
serves to evenly guide the developer into the cylindrical main body 30.

When cleaning the filter 38, the cylindrical body 30
By removing the end plate 31 from the filter 3
8 can be easily taken out.

Next, the structure of the developer squeezing roller device 21 will be explained in detail with reference to FIGS. 6 to 8.

On the photosensitive paper exit side of the developing section 5, two side plates 40 and 41 facing each other are fixed to the electrophotographic engraving machine main body 1, and lower bearings 42 and 43 are provided on the side plates 40 and 41, respectively. Fixed. A lower drive roller 4 is attached to both lower bearings 42 and 43.
Both ends of the core shaft 45 of No. 4 are rotatably attached to each other, and the core shaft 45 is connected to the motor 23.

On the upper side of both lower bearings 42, 43, notch grooves 46, 4 are provided which open at the upper ends of side plates 40, 41, respectively.
7, and upper bearings 48 and 49 are engaged with the notch grooves 46 and 47, respectively, so as to be slidable in the vertical direction. One end of the core shaft 51 of the upper presser roller 50 is attached to one of the upper bearings 48, 49 (here, the upper bearing 48) so as to be rotatable only. That is, one end of the core shaft 51 is axially regulated in position with respect to the upper bearing 48 by retaining rings 54 and 55 mounted in outer circumferential grooves 52 and 53 of the core shaft 51. The other upper bearing 49 has
The other end of the core shaft 51 of the upper presser roller 50 is attached to be rotatable and movable in the axial direction. Tension springs 56 and 57 are removably stretched between the lower bearings 42 and 43 and the upper bearings 48 and 49, respectively.
is pressed against the top surface of the

When cleaning the upper presser roller 50, as shown in FIG. With the upper bearing 48 attached to the presser roller 50, the core shaft 51 of the upper presser roller 50 is attached to the upper bearing 4.
Just take it out from 9.

As shown in FIG. 9, the electrophotographic engraving machine main body 1 here consists of a lower housing 58 and an upper housing 59, and the upper housing 59 can be opened upward. . And side plates 40, 4
1 is fixed to the lower housing 58 side, the above-described removal operation of the upper presser roller 50 can be easily performed with the upper housing 59 open.

As is clear from the above description, according to the present invention, the upper presser roller of the squeezing roller device can be easily removed. Therefore, the upper presser roller can be cleaned easily. Also, since the structure is extremely simple,
It will be possible to provide it at a low price.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of an electrophotographic engraving machine showing an embodiment of the present invention, FIG. 2 is a schematic vertical cross-sectional view of the developing section and squeezing roller device of the embodiment shown in FIG.
Fig. 3 is a cross-sectional view of the main part of the developing section, Fig. 4 is a perspective view of the end of the cylindrical body of the developing section, Fig. 5 is a partial perspective view of the filter of the developing section, and Fig. 6 is a developing aperture roller device. 7 is a front view of the upper squeezing roller device with the upper pressing roller removed; FIG. 8 is an exploded perspective view of the squeezing roller device; FIG.
The figure is a perspective view showing a state in which the upper housing of the main body of the electrophotographic engraving machine is opened. 1...Electrophotographic engraving machine main body, 5...Developing section, 10...
Photosensitive paper, 21... Aperture roller device, 40, 41... Side plate, 42, 43... Lower bearing, 44... Lower drive roller, 45... Core shaft, 46, 47... Notch groove, 48, 49... Upper bearing, 50... Upper part. Presser roller, 51... core shaft, 56, 57... tension spring.

Claims (1)

[Scope of utility model registration request] In the developer squeezing roller device of an electrophotographic engraving machine, which squeezes the developer from the photosensitive paper sent out from the developing unit by a lower driving roller and an upper presser roller on the exit side of the developing unit in the electrophotographic engraving machine main body, Side plates facing each other are fixed to the main body of the electrophotographic engraving machine on the photosensitive paper exit side of the developing section, and both ends of the core shaft of the lower driving roller are rotatably attached to lower bearings fixed to the both side plates, respectively. A notch groove opening at the upper end of the side plate is provided on the upper side of the lower bearing, and one end of the core shaft of the upper presser roller can only be rotated by one of the upper bearings engaged with both the notch grooves. At the same time, the other end of the core shaft of the upper presser roller was attached to the other upper bearing so as to be rotatable and movable in the axial direction, and was removably spanned between the lower bearing and the upper bearing. The upper presser roller is pressed against the upper surface of the lower drive roller by a tension spring, and when one of the tension springs is removed, the upper presser roller is pressed against the upper surface of the other drive roller with one upper bearing attached to the upper presser roller. A developer squeezing roller device for an electrophotographic engraving machine, characterized in that it can be extracted from a bearing.