JPH0559019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a paper feeding device for an electrostatographic printer.

Conventional technology Conventionally, the paper feeding method for electrostatic photographic printers is as follows:
There are various types of printers, but in particular, there is an electrostatographic printer of the type in which the paper feed cassette is installed at the top of the housing in order to reduce the footprint and to facilitate monitoring of the paper. Further, in some electrostatic photographic printers of this type, in order to obtain various paper feeding conditions, a manual feeding port or an insertion port is provided in communication with the paper path from the paper feeding cassette to the transfer section.

Problems to be Solved by the Invention In this type of electrostatic photographic printer,
Having multiple paper feed ports means that paper may be fed redundantly during use, leading to problems such as jams.

Means for Solving the Problem A photoconductor on which an electrostatic latent image is formed at least on the outer periphery is provided inside the casing, a transfer section is positioned below the photoconductor, and a developing section is arranged around the photoconductor. The transfer section and the fixing section are sequentially arranged, a paper feed cassette is provided on the upper surface of the housing, and a paper feed roller for drawing out the sheets stacked in the paper feed cassette is located at an end of the paper feed cassette. A paper guide is disposed inside the casing to communicate the paper feed roller and the transfer section and guide the paper fed by the paper feed roller to the transfer section, and forming a manual insertion port communicating with the paper guide in the upper part of the housing on the paper side, and forming an insertion opening communicating with the lower part of the paper guide in the lower side of the housing;
A door having a length that opens and closes the insertion port and closes the paper guide when the insertion port is opened is rotatably attached to the housing.

Effect: Therefore, the position of the door changes depending on whether paper is being fed from the insertion slot or not, and this makes it difficult to connect another paper feeding device to the insertion slot. In this case, since the paper guide is closed by the door, paper is not fed from the paper feed cassette, and there is no risk of duplicate paper feeding.

Embodiment A first embodiment of the present invention will be described based on FIGS. 1 and 2. 1 is a housing. This housing 1 has a box-shaped base 2 with an opening on the top and a box-shaped cover 3 with an opening on the bottom, which are rotatably connected by a support shaft 4.
are removably connected to each other by a clamp (not shown). The base 2 also has a drum frame 7 which rotates around a support shaft 5, is urged downward by its own weight, and is positioned by a stopper 6.

A cylindrical photoreceptor 8 is connected to a motor (not shown) and rotatably supported on a part of the base 2, that is, the drum frame 7, and is electrically charged along the outer periphery of the photoreceptor 8. A developing section 9, a developing section 16, a transferring section 11, a lamp 12, and a cleaning section 13 are attached. Further, the base 2 includes a fixing roller 14 which is a fixing section, a discharge roller 15, a pressure roller 16 that is in pressure contact with the discharge roller 15, a discharge roller 15, and a fixing roller 1.
4 and a paper feeding section 18 are provided.

Further, on the back side of the upper surface of the cover 3, a light source section 19 is held which performs optical scanning by irradiating the photoreceptor 8 with a laser beam, and a recessed section 21 which holds the paper feed cassette 20 in a slidable manner is opposite to this light source section 19. It is formed. A paper feed roller 22 connected to a motor (not shown) is provided at the back of this recess 21 . Further, a guide plate 23 hanging from one end of the recess 21 and a long guide plate 24 are formed on one side of the cover 3, and a long guide plate 24 is formed on the base 2, and is supported by the drum frame 7 and facing the lower part of the guide plate 24. A guide plate 25 and a guide plate 26 opposing the guide plate 25 are provided below the guide plate 25, and these guide plates 23 to 26 form a paper guide 27 that guides the paper 28.

Furthermore, a manual feed slot 29 is formed in the upper part of the housing 1 and communicates with the upper part of the paper guide 27, and a manual feed slot 3 that communicates with the lower part of the paper guide 27 is formed in the side surface of the housing 1.
0 is formed. This outlet 30 has a door 3
1 is provided so that it can be opened and closed freely. As shown in FIG. 2, the mounting structure of the door 31 is such that a pair of left and right support pieces 32 that rotatably hold the door 31 are fixed to the inner surface of the casing 1, and the door 31 is moved in the closing direction by a spring 33. an electromagnet 35 having a plunger 34 energized and connected to one side of this door 31;
is fixed to the inner surface of the housing 1. The length of the door 31 in the vertical direction is such that when the insertion port 30 is opened, the door 31 contacts the inner surface of the guide plate 25 and the paper guide 2
The length is set to close 7.

In such a configuration, in the process of rotating the photoreceptor 8 once, a charged layer is first formed on the outer periphery of the photoreceptor 8 by the charging section 9, and a laser beam from the light source section 19 is scanned onto this charged layer to form an electrostatic latent image. The electrostatic latent image is visualized by supplying toner from the developing section 10. On the other hand, the paper feed roller 22 feeds the paper feed cassette 2.
The paper 28 pulled out from the paper 28 is guided by the paper guide 27 and sent to the lower part of the photoconductor 8 by the paper feeding section 18, and then the toner image on the photoconductor 8 is transferred by the transfer section 11, and then fixed by the fixing roller 14. The paper is then discharged by a discharge roller 15 and a presser roller 16.

After the transfer, the electrostatic latent image remaining on the photoreceptor 8 is transferred to the lamp 1.
The remaining toner is erased by receiving the light of 2, and the remaining toner is wiped off by the cleaning section 13.

In this way, since the paper feed cassette 20 is provided on the upper surface of the cover 3, the installation area can be significantly reduced.

Furthermore, it can also be used to print by inserting sheets of paper 28 one by one through the manual feed slot 29. When the number of copies to be printed is large and the paper 28 in the paper feed cassette 20 is insufficient, install a large paper feed device (not shown) on the right side of the housing 1 and feed the paper from the paper ejection port of this paper feed device. Paper can be fed into the inlet 30. Further, a copying machine (not shown) is adjacent to the right side of the housing 1, and paper on which a design has been copied by this copying machine is supplied from a paper outlet of this copying machine to an insertion port 30, and the design is It is also possible to transfer the image on the photoreceptor 8 to a sheet of paper that has been subjected to the above-mentioned process.

Note that when opening the insertion port 30, the electromagnet 35 is excited to rotate the door 31, but at this time, the door 31 contacts the guide plate 25 and closes the paper guide 27.

Next, a second embodiment of the present invention will be explained based on FIG. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the static elimination brush 3
6 is attached to the insertion port 30. Therefore, the static electricity on the paper fed from the insertion port 30 can be removed from the static electricity removal brush 36 to the housing 1.

Effects of the Invention As described above, the present invention provides a photoreceptor on which an electrostatic latent image is formed at least on the outer periphery inside a housing, and a transfer section is positioned below the photoreceptor so that the photoreceptor is surrounded by a photoreceptor. A developing section, the transfer section, and a fixing section are arranged in sequence, and a paper feed cassette is provided on the upper surface of the housing, and a paper feed roller that pulls out the sheets stacked in the paper feed cassette is attached to the end of the paper feed cassette. A paper guide is disposed inside the casing and communicates between the paper feed roller and the transfer section and guides the paper fed by the paper feed roller to the transfer section, and forming a manual feeding port communicating with the paper guide in the upper part of the housing on the paper feeding side of the cassette;
An insertion port communicating with the lower part of the paper guide is formed at a lower side of the housing, and a door is provided with a length that opens and closes the insertion port and closes the paper guide when the insertion port is opened. Since it is rotatably attached to the housing, the position of the door changes depending on whether paper is being fed from the inlet or not.
As a result, if another paper feeding device is connected to the insertion slot, the paper guide will be closed by the door, so paper will not be fed from the paper cassette, and duplicate paper feeding will not occur. It has the effect that there is no danger.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing a first embodiment of the present invention, Fig. 2 is a perspective view showing a door mounting structure thereof, and Fig. 3 is a partial longitudinal sectional view showing a second embodiment of the invention. FIG. 1... Housing, 8... Photoreceptor, 10... Developing section,
11... Transfer section, 14... Fixing roller (fixing section),
20...Paper feed cassette, 22...Paper feed roller, 2
7... paper guide, 28... paper, 29... manual feed slot, 30... insertion slot, 31... door, 36... static elimination brush.

Claims (1)

[Claims] 1. A photoconductor on which an electrostatic latent image is formed at least on the outer periphery is provided inside the casing, a transfer section is located below the photoconductor, and a developing section, the transfer section, and a fixing section are arranged around the photoconductor. A paper feed cassette is provided on the upper surface of the casing, and a paper feed roller for pulling out the stacked sheets in the paper cassette is located at the end of the paper cassette, and A paper guide that communicates the paper feed roller with the transfer section and guides the paper sent by the paper feed roller to the transfer section is disposed in the casing on the paper feed side of the paper feed cassette. A manual feed port communicating with the paper guide is formed in the upper part, an insertion port communicating with the lower part of the paper guide is formed in the lower side of the housing, and the insertion port is closed and the insertion port is closed. 1. A paper feeding device for an electrostatic photographic printer, characterized in that a door is rotatably attached to the housing and has a length that closes the paper guide when the paper guide is opened.