JPS62138267A - Printer - Google Patents

Abstract

PURPOSE:To make the easy printing possible regardless of the type of the use paper to be printed, by a method wherein the panel on the rear of a printer is made capable of being opened and closed, the reverse part fixed to this panel being used as a discharge paper tray and a manual tray is established in front of the printer. CONSTITUTION:A rear panel 18 is, in a freely opening and shutting manner, attached to a body 1 utilizing its bottom end as a center of rotation and the switch 19 detecting the opening and shutting state of the panel 18 is provided to the body 1 at a position facing the upper end of this panel 18. Then, the reverse part of a circular arc form 20 is fixed inside this panel 18. In the case of the use paper of thick paper, thin transparent paper, etc., the rear panel 18 is opened and the paper is supplied from a manual tray 14. The feed paper from the manual tray 14 is carried out with manual rollers 15a and 15b and the paper is conveyed to resist rollers 11a and 11b by the rotation of those rollers. The fixerd paper 7 is discharged on the reverse part 20 fixed inside the panel 18 with discharge rollers 17a and 17b utilizing the reverse part 20 as a discharge tray.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer that forms an image on a sheet of paper, and more particularly to a laser beam printer.

[Conventional technology]

A laser beam printer that forms an image on a sheet of paper using a laser beam has conventionally been constructed as shown in FIG. That is, a photosensitive drum 2 is rotatably mounted approximately at the center of the main body 1, and an electrophotographic process is performed around it. An iF electric device 3, a developing device 4, a transfer device 5, a cleaner 6, etc. are provided. A paper cassette 8 for storing paper 7 is removably installed on one side of the main body 1, and a paper ejection tray 9 for storing the printed paper 7 is removably installed on the opposite side of the main body 1. There is.

Inside the main body 1 on the side where the paper cassette 8 is installed, there is a pickup roller 10 and registration rollers lla and ll for straightening the bend of the paper 7 inserted from the cassette 8.
A pair of fixing rollers 12a, 12b and a discharge roller 13a are provided in the main body 1 on the side where the paper discharge tray 9 is attached.

13b is provided6 According to the conventional printer described above, since the paper cassette 8 and the paper ejection tray 9 protrude from both sides of the main body 1, a large installation area is required.

In order to solve this problem, as shown in FIG. 5, a paper output tray 9 is provided at the top of the main body 1, a paper cassette 8 is housed at the bottom of the main body 1, and the paper path is bent. A printer in which the size of the printer is approximately equal to the size of the main body 1 has been proposed. According to this proposal, the paper 7 is loaded with the printed side facing down in the paper output tray 9,
The advantage is that there is no need to rearrange the pages.

However, since the path through which the paper 7 passes is bent, there is a problem in that it is difficult for thick paper or extremely thin transparent paper such as OHP to pass through.

[Problem that the invention seeks to solve]

As mentioned above, the present invention solves the problem that occurs when printers are miniaturized, which makes it difficult to print on thick or thin paper due to bends in the paper path, and enables easy printing regardless of the type of paper being printed on. The purpose is to provide printers.

[Means for solving problems]

In the present invention, paper is taken out from a paper cassette provided in the main body of the printer, printed using an electrophotographic method, and then transferred to a paper output tray provided at the top of the main body via a reversing section provided on the back side of the main body. In a printer configured to load with the printed side facing downward, a manual feed tray is provided on the front surface of the main body opposite to the back surface of the main body where the reversing section is provided, and a panel on the back surface of the main body is formed to be openable and closable. The reversing section is fixed to the panel, and the printed paper is stacked with the printed side facing up when the panel is open.

[Effect]

According to the above configuration, when printing on plain paper, the paper is taken out from the paper cassette as before, the panel is closed, and after printing, the paper is stacked with the print side down on the paper output tray at the top of the device via the reversing section. However, if the paper is thick paper or thin transparent paper, leave the panel open, feed the paper from the manual feed tray, go straight after printing, and use the reversing section fixed to the panel as a paper output tray to remove the printed surface. Since it can be stacked upside down, it only requires an area equal to the installation area of the main body of the printer, and printing can be done easily by opening the panel only when printing on thick paper or ultra-thin paper.

〔Example〕

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

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

In this figure, parts that are the same or equivalent to those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals, and their explanation will be omitted. A manual feed tray 14 and a manual feed roller 15 are provided at the center of the front of the main body 1 to feed paper from sources other than the paper cassette 8.
a and 15b are provided. A paper detection switch 16 for detecting the paper 7 and a paper detection switch 16 for detecting the paper 7 are provided downstream of the fixing rollers 12a and 12b for fixing the toner on the paper 7.
Discharge rollers 17a and 17b are provided for discharging. In addition, the rear panel 18 is attached to the main body 1 so that it can be opened and closed with its lower end as the center of rotation.
A panel 1 is provided on the main body 1 at a position opposite to the upper end of the panel 8.
A switch 19 is provided to detect whether the switch 8 is open or closed. Inside this panel 18 is an arc-shaped inverted portion 20.
is permanently installed. At the top of the back of the main body 1 is a panel 18.
Discharge rollers 13a, 13b that direct the paper 7 onto the paper discharge tray 9 when the paper is closed, and a paper detection switch 21 are provided. Further, a control circuit 22 for controlling the apparatus and a laser optical system 23 for exposing the photosensitive drum 2 are provided at the upper part of the main body 1 and below the paper output tray 9. A display panel 24 is provided on the upper front surface, and LEDs 25 are attached to indicate the status of the panel 18. 26 is a roller for supplying toner to the photosensitive drum 2.

The operation of this embodiment will be explained below. paper cassette 8
The paper 7 stored in the photosensitive drum 2 is extracted by the rotation of the pickup roller 1o, straightened by registration rollers 11a and llb, and conveyed to the photosensitive drum 2. - The force photosensitive drum 2 is charged and exposed by a charger 3 and a laser optical system 23, and a toner image is formed on its surface by a developer 4.

Next, the paper 7 conveyed by registration rollers lla and llb comes into contact with the photosensitive drum 2, and the toner image on the photosensitive drum 2 is transferred onto the paper 7 by the action of the transfer device 5. Thereafter, the photosensitive drum 2 is put into a reusable state by the cleaner 6. On the other hand, the paper 7 to which the toner image has been transferred is transferred to the fixing roller 12a.

12b, and discharged onto the paper discharge tray 9 by discharge rollers 17a, 17b and 13a, 13b. Control circuit 2 is activated by turning OFF the paper detection switch 16.21.
2 makes a jam judgment.

On the other hand, if the paper 7 is thick paper or thin transparent paper, the rear panel 18 is opened and the paper is fed from the manual feed tray 14. Paper is fed from the manual feed tray 14 by a manual feed roller 15a,
15b, and the rotation of these rollers causes the registration rollers 11a to rotate.

11b. The following operation until fixing is cassette 8.
This is the same as when paper is fed from. As shown in FIG. 2, the fixed paper 7 is delivered to a discharge roller 17a.

Inversion part 20 fixed to the inner surface of panel 18 by 17b
It is discharged to the top. At this time, the paper detection switch 21 does not operate, but since the switch 19 is OFF, the control circuit 22 does not determine that there is a jam.

When the panel 18 is open, the control circuit 22 illuminates the LED 26 on the display panel 24, prompting the operator to open the panel 18.
8 is open. Note that it is also possible to feed paper from the cassette 8 even when the panel 18 is open. However, the printed paper 7 has its printed side facing upward.

According to this embodiment, when printing on plain paper, the printing surface can be turned downward, there is no need to rearrange the pages, and printing on thick paper is also possible.

FIG. 3 is a sectional view showing a second embodiment of the present invention, in which a solenoid 27 is provided at the bottom of the panel 18, and an operation switch 28 is provided on the display panel 25. In this embodiment, when the operation switch 28 is pressed, the solenoid 27 is activated and the panel 18 is opened. Then, when the operating switch 28 is pressed again, the solenoid 27 closes the panel 18. The panel 18 can also be opened and closed according to instructions from the host computer.

That is, even if an instruction is given to feed paper from the cassette 8 with the panel 18 forgotten to be closed, the panel 18 can be automatically closed and the paper 7 can be stacked on the paper discharge tray 9 with the printed side facing down.

According to this embodiment, since the panel 18 can be opened and closed with one touch, forgetting to close the panel 18 can be prevented.

〔Effect of the invention〕

As described above, according to the present invention, the rear panel of the printer can be opened and closed, the reversing section fixed to this panel can be used as a paper output tray, and the manual feed tray is provided on the front of the printer. Paper such as thick paper or ultra-thin paper can be fed, ejected, and printed in a straight line, and plain paper can also be loaded with the print side facing down on the paper output tray, making it possible to handle many types of paper with a small printer. It can be printed by.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the printer according to the present invention, FIG. 2 is a vertical cross-sectional view of main parts showing the operation of this embodiment, and FIG.
The figure is a longitudinal sectional view showing another embodiment of the present invention, and FIGS. 4 and 5 are longitudinal sectional views showing a conventional printer, respectively. 1... Main body, 7... Paper, 8... Paper cassette, 9... Output tray, 14... Manual feed tray, 1
8... Panel, 20... Reversing section, 27... Solenoid, 28... Operation switch.
1- parable

Claims (1)

[Claims] 1. Take out paper from a paper cassette provided in the main body of the printer, print it using an electrophotographic method, and then transfer the paper through an inversion section provided on the back side of the main body to the paper cassette provided on the top of the main body. In a printer configured to load paper with the printed side facing down on a paper output tray, a manual feed tray is provided on the front of the main body on the opposite side to the back of the main body where the reversing section is provided,
A printer characterized in that a panel on the back of the main body is formed to be openable and closable, and the reversing section is fixed to the panel, and the printed paper is stacked with the printed side facing up when the panel is open. 2. The printer according to claim 1, wherein the lower end of the panel is rotatably supported by the main body, and is rotated by a drive source provided in the main body. 3. The printer according to claim 1 or 2, wherein the drive source is a solenoid operated by an operation switch.