JPH0575112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus, and more specifically, to a copying apparatus in which a device for indicating a position of a conveyance failure in a recording paper conveyance path in a copying apparatus is improved. It is.

[Conventional technology]

There have been various conventional devices for indicating the position of conveyance failure in the recording paper conveyance path, but all of them have a plurality of conveyance failure detection means, each of which has a lamp connected directly or through a drive circuit,
A display device such as an LED or a liquid crystal is disposed on the display panel section, and the display device corresponding to whichever detection means detects a conveyance defect is displayed by lighting up.

[Problem that the invention seeks to solve]

Conventional indicating devices require a plurality of indicators and require wiring from each conveyance failure detection means to each indicator, resulting in high material and component costs and complicated assembly and maintenance operations.

The present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to provide a copying apparatus having a simple structure and low cost and provided with a recording paper conveyance defective position indicating device.

[Means for solving problems]

The above object is to provide a copying apparatus in which at least a recording paper conveyance means and an original exposure means stop when a conveyance failure occurs in a recording paper conveyance path. This is achieved by a copying apparatus characterized in that it has a display section that displays a conveyance failure position corresponding to a stop position of the indicator provided on the main body.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a first embodiment, and FIG. 2 explains an embodiment of an electrostatographic copying apparatus in which an illumination unit is moved as an original exposure means (original scanning means). FIG.

A transparent glass document placement plate 1 on which the original D is placed is provided in the center of the upper part of the main body of the copying machine, and a scale is provided at the left end of the document placement plate 1 to specify the placement position according to the size of the document D. A board 2 is provided,
Furthermore, the placed original D is placed on the upper part of the original placing plate 1.
A document cover 3 that covers the document is provided so as to be foldable forward. The original D is placed on the original placing plate 1 according to the scale designated by the scale plate 2, and is covered with the original cover 3 to restrict its movement.

In the main body of the copying apparatus below the original plate 1, an illumination unit 12 including an exposure lamp 10 and a first mirror 11 is moved in a straight line parallel to the original plate 1 and in the left-right direction in FIG. The scanner is provided so that the entire surface of the document D can be scanned. This illumination unit 12 is provided with an index attachment part 5, which will be described later. Further, the mirror unit 15, which is constructed by integrating the second mirror and the third mirror, moves in the left and right direction in FIG. 2 at half the speed of the illumination unit 12 so as to maintain a predetermined optical path length. It is designed to be able to move linearly parallel to the document placement plate 1.

The reflected light from the original D on the original plate 1 is reflected by the first mirror 11 and the mirror unit 15, and then enters the lens unit 16. The light exiting the lens 16 passes through the fourth mirror 17. The image of the document D is projected onto the photoreceptor drum 20 as an image carrier through the slit 18, and exposed by the lens unit 16. ing.

The charging electrode 21 uniformly charges the photoreceptor drum 20, and electrostatic latent images are sequentially formed on the photoreceptor drum 20, which rotates clockwise in FIG. 2 by exposure from the optical system. will be done. The developing device 22 converts the electrostatic latent image on the photosensitive drum 20 into a visible toner image.

On the other hand, the feeding device that feeds the recording paper is
a paper feed roller 24 that feeds out recording paper P one by one from a paper feed cassette 23 (here, two are illustrated) that accommodates a paper feed cassette 23 (here, two are illustrated), and a registration roller 25 that feeds the fed out recording paper P to the photoreceptor drum 20 side. between the paper feed cassette 23 and the registration roller 25, and between the registration roller 25 and the transfer pole 28 described later.
It consists of guide plates 26 and 27 arranged between.

During copying, the recording paper P in the selected paper feed cassette 23 is fed out by the paper feed roller 24, guided by the guide plate 26, and reaches the registration roller 25.
The recording paper P is driven with a paper feed timing signal such that the leading edge of the toner image on the recording paper P coincides with the leading edge of the recording paper P.

The transfer pole 28 is used to transfer the toner image on the photoreceptor drum 20 onto the recording paper P, and the separation pole 29 is used to separate the recording paper P from the photoreceptor drum 20. The paper is sent to the fixing device 31 via the transfer conveyance means 30, and after being melted and fixed by a heat fixing roller and a pressure roller, the paper is transferred to the paper ejection roller 3.
2, the paper is discharged onto a paper discharge tray 33. After the transfer process is completed, the photosensitive drum 20 is cleaned by a cleaning device 34 to remove toner remaining on the drum.
is removed and prepared for the next cycle.

In FIG. 2, A is a paper feed section jam detection member located near the transfer section side of the registration roller 25 to detect recording paper conveyance failure in the paper feed section, and B is a separation pole 29.
A transfer section jam detection member C is located between the cleaning device 34 and the transfer section to detect a recording paper conveyance failure in the transfer section. This is a paper discharge section jam detection member for detection. The above detection members A, B and C
is composed of a detection means such as a reflective or transmission type light detection means or a micro switch, and the paper feed section jam detection member A detects the leading edge of the recording paper P during normal operation after the copying operation of the copying machine starts. If the passage of the recording paper P is not detected after the time elapses until the recording paper P reaches the position of the detection member A, the copying operation of the copying machine is stopped by a signal issued by the detection member A. ,
It is designed to detect paper feed conveyance failure in the paper feed section. In the transfer section jam detection member B, after the copying operation of the copying machine starts and the toner image is transferred onto the recording paper P, the recording paper P is separated from the photoreceptor drum 20 and almost reaches the transfer conveyance means 30. After the time required to reach the photoreceptor drum 2
When the presence of the recording paper P on the photoreceptor drum 20 is detected, the copying operation is immediately stopped by a signal issued by the transfer section jam detection member B, so that the recording paper P is not separated from the photoreceptor drum 20. It is designed to detect an abnormality when the photosensitive drum 20 is wrapped around the photosensitive drum 20.

In addition, the paper ejecting section jam detection member C is used from the start of the copying operation of the copying machine until the leading edge of the recording paper P reaches almost immediately in front of the paper ejection roller 32 in normal operation. If the passage of the recording paper P is not detected after the required time has elapsed, the copying operation is immediately stopped by a signal issued by the detection member C, indicating a recording paper conveyance failure in the paper ejection section and fixing section. It is now possible to detect

In parallel with the above-described operation of the copying machine, the illumination unit 5 scans the entire surface of the document D, so that it moves from left to right in FIG. is moving. For example, in this embodiment, when the paper feed section jam detection member A is activated and the copying operation of the copying machine is stopped, the illumination unit 5 is stopped at a position approximately 1/6 of its total stroke.

When the transfer section jam detection member B operates and the copying operation of the copying machine is stopped, the illumination unit 5 is stopped at a position approximately 5/8 of the way through its entire stroke.

Furthermore, when the paper discharge section jam detection member C is activated and the copying operation of the copying machine is stopped, the illumination unit 5 completes its entire stroke and stops at a position about 1/3 of the way back to the left from the end of the stroke. are doing.

As described above, when the jam detection member in any one of the paper feed section, transfer section, and paper discharge section is activated and the copying operation of the copying machine is stopped, the illumination unit 12 is placed at a substantially fixed position corresponding to each section. Since the lighting unit 12 is stopped, the attached indicator 5
The location of the conveyance failure of the recording paper can be known by the display section which displays the position of the conveyance failure corresponding to the position and the stop position of the index 5.

The mirror unit 15 also moves at half the speed of the illumination unit 12;
Since the mirror unit 15 is linearly moved in the left-right direction in FIG. 2 in parallel with the photosensitive drum 20 and in synchronization with the photosensitive drum 20, by attaching an index to the mirror unit 15, it is possible to indicate the position of a recording sheet conveyance failure.

FIG. 1 is an external view of a copying machine of a moving illumination unit type in which an index is attached to the illumination unit 12 to indicate the position of recording paper conveyance failure, and FIG. 3 shows the copying operation of the copying machine described above. It is a flowchart.

Next, an electrophotographic copying apparatus of a type in which an optical system is fixed as an original exposure means (original scanning means) and an original table is moved from side to side will be explained with reference to FIGS. 4 to 6.

FIG. 4 is a sectional view of a main part of the above-mentioned document table moving type copying machine. The upper part of the copying machine main body consists of a transparent glass document placement plate and a document cover 3 that can be folded forward to restrict the movement of the original. A movable document table 4 is provided.

Inside the copying machine body below the document table 4, there are an illumination unit 12 equipped with an exposure lamp, a mirror, etc., and a lens unit 16, and a photosensitive drum 20 is located approximately in the center of the copying machine body. Lighting unit 1
The image of the original illuminated by the lens unit 2 is projected onto the photosensitive drum 20 by the lens unit 16 and exposed. Photosensitive drum 2
The process of charging, exposing, developing, transferring, and cleaning the photoreceptor above, and the recording paper P selected and fed out from either the paper feed cassette 23b or the manual paper tray 23a is transferred to the paper feed roller 24. ,
The process sequence in which the paper is fed in accordance with the paper feeding timing using the registration rollers 25, etc., passes through the transfer and fixing process, and is then delivered to the paper delivery tray 33 is entirely based on the illumination unit movement method explained in FIG. Since it is the same as the copying machine, its explanation will be omitted.

In this apparatus, the method of scanning the original for the above-mentioned exposure is that the original platen 4 moves linearly from side to side in synchronization with the rotation of the photosensitive drum 20 at the top of the copying apparatus as shown in FIG. Since it is necessary to start from one end of the document, for example, in the case where the photosensitive drum 20 and lens unit 9 are arranged in the center of the main body as shown in FIG.
must be moved to the position indicated by the two-dot chain line in FIG. 4 and stand by before the exposure process.
Here, the movement of the document table 4 in the direction of arrow A shown in FIG. 2 is referred to as return, and the movement in the direction of arrow B is referred to as forward.

The document table 4 moves from the standby position to the photosensitive drum 20.
The exposure process begins by moving in the forward direction in synchronization with the rotation of. Then, when the paper feed section jam detection member A operates and the copying operation of this apparatus is stopped, when the transfer section jam detection member B operates and the copying operation of this apparatus is stopped, or when the paper discharge section jam detection member C
FIG. 6 shows the stop positions of each document table 4 when the copying operation of this apparatus is stopped. In addition, the flowchart of the above operation is shown in the fifth section.
As shown in the figure. As shown in FIG. 6, the document table 4 stops at a predetermined position depending on the location where the recording paper conveyance failure occurs, so for example, an index 5 is provided on the side surface of the document table 4 and the above-mentioned stop position corresponds to the stop position. If the location where the recording paper conveyance failure occurs is displayed on the surface of the copying apparatus, the location where the recording paper conveyance failure has occurred can be known.

In addition, in the above explanation, the detection parts of the jam are referred to as A, B,
Although the three locations C are used, it is needless to say that the location is not limited to these.

〔Effect of the invention〕

As explained above, according to the present invention, the position of recording paper conveyance failure can be indicated with an extremely simple configuration.
Not only can the display parts and wiring materials that were conventionally required be saved, but also the complicated assembly work can be eliminated and maintenance becomes easy, resulting in extremely excellent effects.

[Brief explanation of the drawing]

Fig. 1 is an external view of a copying machine using a moving illumination unit type according to the present invention, Fig. 2 is a sectional view of main parts of a copying machine using a moving illumination unit type, and Fig. 3 is a recording sheet of a copying machine using a moving illumination unit type. A flowchart of operations related to indicating the position of poor conveyance; FIG. 4 is a cross-sectional view of a main part of a copying device using the document table moving method; FIG. This is a flowchart of the operation. FIG. 6 illustrates the positional relationship of the document table in the above flowchart. 1...Document placement plate, 3...Document cover, 4...
Original table, 5... Index, 7... Display unit, 12... Lighting unit, 15... Mirror unit, 16...
Lens unit, 20... Photosensitive drum, 21...
... Charger, 22 ... Developing device, 23 ... Paper feed cassette, 24 ... Paper feed roller, 25 ... Registration roller, 28 ... Transfer pole, 31 ... Fixing device, 32 ...
Paper ejection roller, 33... Paper ejection stand, 34... Cleaning device, P... Recording paper, A... Paper feed section jam detection member, B... Transfer section jam detection member, C... Paper ejection section jam detection Element.

Claims (1)

[Claims] 1. Along with the occurrence of a conveyance failure in the recording paper conveyance path,
In a copying apparatus in which at least a recording paper conveyance means and an original exposure means are stopped, there is an indicator that moves in accordance with the movement of the original exposure means, and a conveyance failure corresponding to a stop position of the indicator provided on the main body of the copying apparatus. 1. A copying apparatus, comprising: a display section that displays a position. 2. The copying apparatus according to claim 1, wherein the document exposing means is a movable document table. 3. Claim 1, wherein the document exposure means is a moving illumination means or an optical system.
Copying device as described in section.