JPH0340840Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a paper ejecting device for an electrostatographic printer.

Conventional technology Conventionally, in electrostatic photographic printers, a discharge roller is used to discharge the paper that has undergone the transfer and fixing process. be.

Problems to be Solved by the Invention Accordingly, support means for the discharge rollers must be arranged on the left and right sides, which increases the number of discharge rollers and causes an increase in costs.

This invention has been made in view of the above points, and an object thereof is to provide a paper ejecting device for an electrostatic photographic printer in which the supporting structure of the ejecting rollers can be simplified and the number of ejecting rollers can be reduced.

Means for Solving the Problems This invention consists of a developing section that develops an electrostatic latent image formed on the outer periphery of a photoconductor, a transfer section that transfers the developed image onto a wide sheet of paper, and a A pair of fixing rollers that sandwich the entire width of the paper are arranged in sequence, and a support shaft that reaches near the center of the paper is placed close to the fixing roller on a side plate located on one side of the fixing roller so that it can be held in a cantilevered state. A plurality of ejection rollers are rotatably attached to these support shafts and hold a portion of the paper that is deviated from the center to one side. Therefore, the ejection roller that ejects the paper is attached to a spindle that extends in a cantilevered manner from one side plate, so the mounting structure is simple, and it can be used even if the paper is wide. The entire width of the paper is held between the fixing rollers, and the ejection roller is provided close to the fixing roller, so the ejection roller only needs to hold the paper at a portion that is biased to one side from the center. This makes it possible to support the discharge roller in a cantilever manner, thereby simplifying its support structure.

Embodiment An embodiment of this invention will be described based on the drawings.
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.
On the opposite side to the support shaft 4, the base 2 and cover 3 are removably connected 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 section 9, a toner supply section 10 which is a developing section, a transfer section 11, a lamp 12, and a cleaning section 13 are attached. Further, the base 2 includes a fixing roller 14, ejection rollers 15 and 16, a motor 17 for driving the ejection roller 15 and the fixing roller 14, and a paper feeding section 18.
is provided.

Further, on the back side of the top surface of the cover 3, a light source section 19 is held that performs optical scanning by irradiating a laser beam onto the photoreceptor 8, and a recessed section 21 that faces the light source section 19 and holds a paper feed cassette 20 in a slidable manner. 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 opposite to the lower part of the guide plate 25 are provided, and a paper guide 27 is formed by these guide plates 23 to 26.

As shown in FIGS. 2 and 3, the upper discharge roller 16 is a rubber roller and is elastically contacted with the lower discharge roller 15. These discharge rollers 15 and 16 are fixed to a cylindrical shaft 28, and these cylindrical shafts 28 are fixed to a support shaft 3 that is cantilevered to the side plate 29 of the base 2 via a flange 30.
1 is rotatably fitted. These spindles 3
1 has a retaining ring 32 at the tip to prevent the cylindrical shaft 28 from coming off.
is fixed. Both the cylinder shaft 28 and the support shaft 31 support the paper 3.
It is not long enough to reach the center of 3, therefore,
The discharge rollers 15 and 16 are arranged biased to one side of the paper 33.

As shown in FIG. 2, a motor 17 that drives the fixing roller 14 via a transmission device 34 is located between the fixing roller 14 and discharge rollers 15 and 16, and is located at the end of the lower fixing roller 14. An idler gear 37 is supported on the side plate 29 of the base 2 and meshes with a gear 35 fixed to the shaft 28 and a gear 36 fixed to the cylindrical shaft 28 holding the discharge roller 15.

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 33 pulled out from the paper feed cassette 20 by the paper feed roller 22 is transferred to the paper guide 2.
7, the paper is sent to the lower part of the photoreceptor 8 by the paper feeding section 18, the toner image on the photoreceptor 8 is further transferred by the transfer section 11, fixed by the fixing roller 14, and further ejected by the ejection rollers 15 and 16. Ru.

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.

As described above, the paper 33 after fixing is ejected by the ejection rollers 15 and 16 on only one side, but just before that, the fixing roller 14 pinches the entire width of the paper 33 and exhibits a paper feeding action, so that the paper 33 is There is no risk of it being ejected tilted. The number of discharge rollers 15 and 16 is also small, and the support structure is simple due to cantilever support, making it possible to reduce costs.

Effects of the invention As described above, this invention consists of a developing section that develops an electrostatic latent image formed on the outer periphery of a photoreceptor, a transfer section that transfers the developed image onto a wide sheet of paper, and a sheet of paper after development. A pair of fixing rollers sandwiching the entire width of the sheet are arranged in sequence, and a support shaft reaching near the center of the paper is placed close to the fixing roller on a side plate located on one side of the fixing roller in a cantilevered state. fixed,
A plurality of ejection rollers are rotatably attached to these spindles to sandwich the portion of the paper that is deviated from the center to one side, so that the ejection roller that ejects the paper extends in a cantilevered manner from one side plate. The installation structure is simple because it is attached to a fixed shaft, and even if the paper is wide, the entire width of the paper is held between the fixing rollers, and the ejection roller is close to the fixing roller. Since the ejecting roller is provided with a support structure, the ejecting roller only needs to pinch the paper at a portion that is biased to one side from the center of the ejecting roller, which makes it possible to support the ejecting roller in a cantilevered manner, thereby simplifying its support structure. It has the effect of being able to.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a vertical side view, FIG. 2 is a partial plan view showing the arrangement of the fixing roller and discharge roller, and FIG. 3 is an exploded perspective view thereof. 8... Photoreceptor, 10... Toner supply section (developing section), 11... Transfer section, 14... Fixing roller, 1
5, 16...Discharge roller, 33...Paper.

Claims (1)

[Scope of utility model registration request] A developing section that develops an electrostatic latent image formed on the outer periphery of a photoconductor, a transfer section that transfers the developed image onto a wide sheet of paper, and a pair of fixing rollers that sandwich the entire width of the sheet after development. They are arranged in sequence, and support shafts that reach near the center of the paper are fixed in a cantilever state in close proximity to the fixing roller on a side plate located on one side of the fixing roller, and the support shafts of the paper are fixed on these support shafts in a cantilevered state. A paper ejecting device for an electrostatic photographic printer, characterized in that a plurality of ejecting rollers are rotatably attached to sandwich a portion biased to one side from the center.