JPH0250021B2 - - Google Patents

Description

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

Prior Art The paper feeding method for conventional electrostatographic printers is as follows:
Generally, this is done by attaching a paper feed cassette to the side of the printer's housing.

Problems to be Solved by the Invention Therefore, there is a drawback that the paper feed cassette largely protrudes from one side of the housing, resulting in a large installation area.
Some models have a paper feed cassette located at the bottom of the housing, but since the vertical mounting distance between the transfer unit and the paper feed cassette is small, the paper pulled out from the paper feed cassette can be bent with a small half-curvature to make a U-turn. I have to let it happen. For this reason, it is difficult to advance the paper straight between the photoreceptor and the transfer section, which poses a problem that may impede printing.

The present invention has been made in view of these points, and provides an electrostatic photographic printer that can significantly reduce the installation area, and furthermore, can open the inside of the housing and the paper path to facilitate internal inspection and jam removal. The purpose is to provide a paper feeding device for

Means for Solving the Problems The present invention provides a casing 1 having a photoreceptor 8, a toner supply section 10, a transfer section 11, a fixing section 14, a paper feeding section 18, etc., and combines this casing 1 with a base 2. A paper feed cassette 20 and a paper feed roller 22 are mounted on the top surface of the main cover 3.
A sub-cover 24 is provided on the housing 1, and a paper guide 29 is formed between the housing 1 and the sub-cover 24.

Moreover, manual feed ports 33 and 34 are formed in the sub-cover 24.

Function: Therefore, by providing the paper feed cassette 20 on the top surface of the main cover 3, the floor space can be significantly reduced. This allows the paper guide 29 to be opened, thereby making it possible to easily perform internal inspection, jam removal, etc.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a housing. This case 1
A box-shaped base 2 with an opening on the top and a box-shaped main cover 3 with an opening on the bottom are rotatably connected by a spindle 4. On the opposite side of the spindle 4, the base 2 and the main cover 3 are not shown in the figure. They are removably connected by a clamp. 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 section 9, a toner supply section 10, a transfer section 11, a lamp 12, and a cleaning section 13 are attached. moreover,
The base 2 includes a fixing roller 14 which is a fixing section, an ejection roller 15, a pressure roller 16 that is in pressure contact with the ejection roller 15, a motor 17 that drives the ejection roller 15 and the fixing roller 14, and a paper feeding section 18. is provided.

In addition, a photoreceptor 8 is provided on the back side of the top surface of the main cover 3.
A light source unit 19 for scanning a laser beam is held,
A holding section 21 is formed on the main cover 3 to face the light source section 19 and hold the paper feed cassette 20 in a detachable manner. A paper feed roller 22 connected to a motor (not shown) is provided at the back of this holding portion 21.

As shown in FIG. 3, a sub-cover 24 is provided with a plurality of protrusions 23 formed on its lower edge. This sub-cover 24 is constructed by inserting a projecting piece 23 into a locking hole 25 formed in the main cover 3 and engaging a leaf spring 26 provided on the inside of the upper surface with the outer periphery of a bearing part 27 for the paper feed roller 22. It is held by the cover 3. A paper guide 29 having a plurality of vertically long ribs 28 is formed between the main cover 3 and the sub-cover 24.
Further, a guide plate 30 held by the drum frame 7 and another guide plate 31 are provided on the base 2 to face each other.

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 toner supply section 10. On the other hand, the paper 32 pulled out from the paper feed cassette 20 by the paper feed roller 22 is guided by the paper guide 29 and guide plates 30 and 31 to the paper feeding section 1.
8 to the lower part of the photoreceptor 8, the toner image on the photoreceptor 8 is further transferred by the transfer section 11, fixed by the fixing roller 14, and further transferred to the lower part of the photoreceptor 8 by the ejection roller 1.
5 and the 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.

Then, by operating the clamp, the main cover 3 can be opened around the support shaft 4 as shown in FIG. The drum frame 7 can also be opened clockwise around the support shaft 5. moreover,
The paper guide 29 is opened by rotating the sub-cover 24 away from the main cover 3 using the insertion portion between the protrusion 23 and the locking hole 25 as a fulcrum, or by removing the protrusion 23 from the locking hole 25. be able to. Therefore, internal inspection and jam removal can be carried out very easily. Since the paper feed cassette 20 is held on the upper surface of the main cover 3 even in the use state, the installation space can be significantly reduced.

Next, a second embodiment of the present invention will be explained based on FIGS. 4 and 5. 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, a manual feed port 33 is formed in the sub-cover 24 through an upper opening that communicates with the paper guide 29. Therefore, this manual feed slot 33 can be used without using the paper feed cassette 20.
It is possible to feed the paper 32 one sheet at a time and print.

Further, as shown in FIGS. 6 and 7, if a guide surface 35 is formed on the side surface of the sub-cover 24 that slopes inward as it goes downward, and a manual feed opening 34 is formed at the bottom of this guide surface 35. Insertion of paper 32 can be facilitated.

Effects of the Invention As described above, this invention can significantly reduce the installation space by providing the paper feed cassette on the top surface of the main cover. At the same time, the sub-cover can be retracted from the housing to release the paper guide, which has the effect of making internal inspection and jam removal extremely easy.

[Brief explanation of the drawing]

Figures 1 to 3 relate to the first embodiment of the present invention, with Figure 1 being a longitudinal side view showing the printed state, and Figure 2 being a longitudinal side view showing the main cover and sub cover opened. Figure 3 is a perspective view of the sub-cover, Figures 4 and 5 are related to a second embodiment of the invention, Figure 4 is a partial longitudinal sectional side view, and Figure 5 is a sub-cover. FIG. 6 is a partial longitudinal sectional side view showing a modification of the means for forming the manual feed port, and FIG. 7 is a perspective view of the sub-cover. DESCRIPTION OF SYMBOLS 1... Housing, 2... Base, 3... Main cover, 8... Photoconductor, 10... Toner supply unit, 11
...Transfer section, 14...Fixing roller (fixing section), 1
8...Paper feed section, 20...Paper feed cassette, 22...
Paper feed roller, 24...Sub cover, 29...Paper guide, 32...Paper, 34, 35...Manual feed slot.

Claims (1)

[Scope of Claims] 1. A housing including at least a photoconductor on which an electrostatic latent image is formed, a toner supply section, a transfer section, a fixing section, and a paper feeding section located near the bottom of the photoconductor; A casing is formed by a base and a main cover that are rotatably connected to each other in a vertical plane, and a paper feed cassette is provided on the upper surface of the main cover, and a paper feeder that pulls out sheets stacked in the paper feed cassette. A roller is rotatably connected to a drive unit, a sub-cover for opening and closing a space outside the side surface of the casing is provided, and a sub-cover is provided between the casing and the sub-cover from the paper feeding roller to the paper feeding roller. 1. A paper feeding device for an electrostatic photographic printer, characterized in that a paper guide is formed that extends to a portion of the paper. 2. A housing is provided which includes at least a photoconductor on which an electrostatic latent image is formed, a toner supply section, a transfer section, a fixing section, and a paper feeding section located near the bottom of the photoconductor. A paper feed cassette is provided on the upper surface of the main cover, and a paper feed roller that pulls out sheets stacked in the paper feed cassette is connected to a drive unit. a sub-cover that opens and closes a space outside the side surface of the casing, and a paper guide extending from the paper feed roller to the paper feeding section is provided between the casing and the sub-cover. A paper feeding device for an electrostatic photographic printer, characterized in that a horizontally elongated manual feeding port is formed in the sub-cover and communicates with the paper guide.