JPH023989B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a copying machine whose mechanical components can be opened and closed, and which is improved by unitizing the paper feeding device.
This relates to a two-part copying machine.

[Prior art]

The internal functions and arrangement of a typical electrophotographic copying machine are as shown in FIG.

In the figure, recording paper P is carried out sheet by sheet in a first direction from a paper feed cassette 2 installed in a copying machine 1, passes through a first paper feed roller 3, makes a U-turn, is reversed, and then reaches a second paper feed roller 4. The timing and conveyance speed are adjusted so that the leading edge of the toner image coincides with the leading edge of a toner image formed on a photoreceptor drum 5, which will be described later.

On the other hand, prior to this, the photoreceptor drum 5, which is uniformly charged on its circumferential surface by the charging electrode 6 and rotates in the direction of the arrow, receives an original document D, which moves in the horizontal direction in synchronization with the circumferential speed of the photoreceptor drum 5. The image of
An electrostatic latent image is sequentially formed on the circumferential surface by a focusing light transmitting member (eg, self-occurring lens, trade name) 8.

As the latent image on the photosensitive drum 5 continues to rotate, it is developed into a toner image by the developing sleeve 9a of the developing device 9 and becomes visible.

The photoreceptor drum 5 further rotates and unites with the recording medium P, which is fed in a direction substantially opposite to the first direction described above, and the transfer pole 10 transfers the toner image on the photoreceptor drum 5 to the recording paper. After the image is transferred onto P, the recording paper P is separated and released at the separation pole 11.

The separated recording paper P is fed to the fixing roller 13 via the conveyance roller 12, and after melting and fixing the toner image, the paper P is sent from the discharge port 15 by the paper discharge roller 14 to the paper discharge tray provided outside the copying machine 1. (not shown)
sent to.

Further, after separating the recording paper P, the photosensitive drum 5 further rotates in the direction of the arrow, and the removal electrode 16
After the charge is removed by the cleaning device 17, residual toner adhering to the photosensitive drum 5 is scraped off. The scraped toner is stored in a cleaner box 18. On the other hand, the photoreceptor drum 5 is again subjected to charge by the charging electrode 6 in order to form an electrostatic latent image based on the next document.

Note that 19 is an insertion slot for recording paper when it is manually fed, and 3a is its first feeding roller.

In the mechanisms and operations of copying machines such as those described above, one of the most common and difficult-to-treat problems is recording paper feeding failure, or jamming. Therefore,
To remove jams, the copying machine 1 is divided into upper and lower parts approximately at the paper feed path, and the upper main body 1 is separated by a hinge H.
A copying machine has been provided in which the main body 1b is openably and closably connected to the lower main body 1b.

By configuring the copying machine 1 in such a way that it can be opened and closed so that the inside can be opened, it not only becomes easier to remove the jam as described above, but it is also convenient for inspecting each functional part and replacing repair parts.

However, the recording paper P is carried out by the half-moon roller 20 from the paper feed cassette 2 to the above-mentioned two-part surface, that is, the second paper feed roller 4, and then the uppermost surface is removed by a sorting roller (not shown). Only one of the sheets has to be squeezed and fed, and has to go through a feeding route that is prone to trouble, such as making a U-turn along the greatly curved guide plate 21. For this reason, feeding failures of the recording paper P before the second paper feed roller 4 are often experienced, and the conventional two paper jam handling methods are
In split-type copying machines, this work is extremely difficult because the parts are not designed to be opened.

[Purpose of the invention]

The present invention provides a two-part copying machine that facilitates jam handling by opening the so-called U-turn paper feeding section from the paper feed cassette to the two-part plane in addition to the two-part splitting. This is the purpose.

[Structure of the invention]

The present invention integrates each feeding roller and guide member constituting the U-turn paper feeding portion and each paper feeding roller and guide portion located on the dividing surface into a unit, and forms an upper main body of a two-part copying machine. The device is configured so that it can be opened following a spring, and the paper fed from the paper storage section is first fed in a first direction, then made a U-turn, and then moved to a second direction, which is almost opposite to the first direction. In a copying machine that feeds paper in a second direction and performs at least image transfer during the paper feeding process in the second direction, at least a portion that performs the U-turn paper feeding is constructed as a unit and is rotatable. A second mechanical component having an image forming section is connected to a first mechanical component including a unit and a frame supporting the paper storage section, with the paper transport path for paper feeding in the second direction as a border. The second mechanical component and the U-turn paper feeding unit are configured to be openable and closable, and when the mechanical component is opened, the U-turn
This is achieved by a two-part copying machine characterized in that a spring is applied in the opening direction of the turn paper feed unit.

〔Example〕

FIG. 2 shows an embodiment of the present invention, in which a copying machine 51
is divided into an upper frame 51a and a lower frame 51b with the paper transport path of the recording paper as a boundary, and the upper frame 51a is rotatably connected and supported by a hinge H, and the upper frame 51a is rotated at approximately 45 degrees. The structure is such that it is stopped and held in the open position by a stay (not shown) or the like.

The upper frame 51a includes a photoreceptor drum 55, a charging electrode 56, an exposure lamp 57, a focusing light transmitter 58, a cleaning device 67, and a developing device 5.
9, etc., forming a first mechanical component, while the lower frame body 51b includes transfer and separation electrodes 60 and 61, and fixing and paper ejection rollers 63 and 64.
The paper storage section 52 and paper feed rollers 53, 5 including
3a, 54, and a driving power source etc. are accommodated,
It forms a second mechanical component.

Furthermore, in the present invention, a half-moon roller 70 and a separating roller (not shown) for carrying out the recording paper from the paper storage section 52, a first paper feed roller 53, a first paper feed roller 53a for manual feeding, and a second paper feed roller 53, paper roller 5
4 and a U-turn guide plate 7 provided between them.
The first unit is made into a U-turn paper feeding unit 51c.

The U-turn paper feed unit 51c is mounted on the hinge H so that it can rotate independently together with the upper frame 51a, and is rotated by a torsion spring 72 suspended between the upper frame 51a and the upper frame 51a. When the upper frame 51a is opened, it receives a clockwise force, but it is locked to the lower frame 51b and maintains the state shown in FIG. 2.

With this configuration, if a paper feed failure such as a jam occurs in the recording paper carried out from the paper storage section 52 before it reaches the second paper feed roller 54, the operation of the copying machine 51 is stopped and the upper When the frame 51a is released and then the lower frame 51b is unlatched, the U-turn paper feed unit 51c easily follows the upper frame 51a due to the action of the torsion spring 72, opens, and records. Since the paper delivery section appears, the above-mentioned jam handling becomes extremely easy.

The present invention not only divides the copying machine 51 into two as described above, but also has a U-turn paper feed unit 51c.
In addition to the advantages of the conventional two-part type copying machine, this copying machine also has elements convenient for handling jams in the U-turn paper feed section. You can.

〔Effect of the invention〕

According to the present invention, it is convenient to inspect, repair, and replace parts of each functional part, and maintenance management is easy, and the conveyance state of recording paper can be inspected over the entire paper conveyance path.
An extremely useful two-part copying machine capable of dealing with feeding errors has now been provided.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional two-segment copying machine. FIG. 2 is a configuration diagram of the two-segment type copying machine according to the present invention when the upper frame body is opened. 51... Copying machine, 51a... Upper frame, 51b
... lower frame body, 51c ... U-turn paper feed unit, 53 ... first paper feed roller, 53a ... first paper feed roller for manual feed, 54 ... second paper feed roller, 7
0...Half-moon roller, 71...Guide plate, 72...
Torsion spring, H...hinge.

Claims (1)

[Claims] 1. Paper is fed from the paper storage section by first feeding the paper in a first direction, then making a U-turn, feeding the paper in a second direction that is substantially opposite to the first direction, and performing a paper feeding process in the second direction. In a copying machine that performs at least image transfer, at least the part that performs the U-turn paper feeding is configured as a unit, and the copying machine includes a rotatable U-turn paper feeding unit and a frame that supports the paper storage section. A second mechanical component having an image forming section is made openable and closable with respect to the first mechanical component with respect to the paper transport path for paper feeding in the second direction, and
A two-part copying machine, characterized in that a spring is applied between the mechanical component and the U-turn paper feed unit in a direction in which the U-turn paper feed unit is opened when the mechanical component is opened.