JPH01122855A - Electrostatic photograph duplicator - Google Patents

Abstract

PURPOSE:To facilitate reutilization of an untransferred sheet, by providing a second control means to feed an untransferred sheet, taken out to a stock part during restarting of duplication, to a transfer part in priority. CONSTITUTION:When the occurrence of a jam is detected, the drive systems of sheet pass routes 12, 17, 18, and 22 are stopped. In which case, after processing of the jam is effected, check of a sheet remaining in the sheet pass route is performed. When it is decided that an untransferred sheet is present on the upper streams side of a transfer part 7, an operation restarting process is entered, a sensitized material 4 is cleaned threat, a route switching mechanism 19 is switched to the switch back sheet pass passage 17 side, and each sheet pass passage system is driven. This constitution takes out an untransferred present on the upper stream side of the transfer part 7 to a stock part, and counts the number of taken-out sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a technology for improving the paper passing form in an electrostatographic copying machine.

[Conventional technology]

In the above-mentioned electrostatographic copying machine, the middle of the paper path from the paper feed section to the paper ejection section, specifically, the location directly downstream of the paper feed section, the vicinity of the transfer section, the vicinity of the fixing section, the paper ejection section, etc. A jam detecting means is arranged to detect the occurrence of a jam in the paper passing path and stop the paper passing drive system, and also to display the location where the jam has occurred by, for example, flashing a lamp, and the remaining jam detecting means detect the occurrence of a jam other than the jam. Some devices are equipped with a panel that displays, for example, the lighting of a lamp, when a sheet of paper is being detected.

According to the above configuration, when the paper feed drive system is stopped based on the jam detection information from the jam detection means, the paper that caused the jam is passed based on the flashing of the lamp. By removing the paper from the paper path and restarting the operation, the paper remaining in the paper path can be taken out to the paper output tray, or the paper remaining in the paper path can be removed based on the lighting of the lamp. Operation can be resumed by eliminating the

[Problem that the invention seeks to solve]

However, among the sheets of paper that have been taken out to the paper output tray and those that have been rejected based on the lighting of the lamps that have not caused the jam, there are some sheets that have not yet been transferred with images. There are many cases where there is paper, and in order to reuse this paper, conventionally the untransferred paper has to be re-stored in the cassette case or manually fed. However, there is a drawback that it takes time and effort to restart copying.

The present invention has been made in view of the above circumstances, and
It is an object of the present invention to make it easier to reuse the untransferred paper by a simple improvement in the paper feeding form, and to make it possible to immediately resume copying work after the jam is cleared.

[Means for solving problems]

In order to achieve the above object, the present invention provides a jam detection means that detects a jam in the paper passing path and stops the paper passing drive system in the middle of the paper passing path from the paper feeding section to the paper discharging section. and a paper take-out means for taking out the paper from the paper passing path to the stock section, and a paper re-passing means for returning the paper taken out to the stock section to the middle of the paper passing path before transfer, and 1i11-11 means for cleaning the photoreceptor and taking out the untransferred paper to the stock section when restarting the operation when the untransferred paper is present in the path leading to the transfer section after the jam has been cleared from the transfer section; The present invention is characterized in that a second control means is provided for causing the untransferred paper taken out to the stock section to be fed preferentially to the transfer section when copying is resumed.

[Effect]

According to the above configuration, when a jam occurs in a situation where there is untransferred paper in the paper path leading to the transfer section, the jam is resolved by removing only the paper that caused the jam and the paper after the transfer section. The untransferred paper is taken out to the stock section by processing and restarting the operation after that, and
When copying is restarted, the untransferred paper taken out to the stock section is first fed to the transfer section, which saves the effort of taking out the untransferred paper from the paper passage and storing it again in a cassette case or the like.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 schematically shows an electrophotographic copying machine in which a copy mode of single-sided copying and double-sided copying can be selected, and is equipped with a document table 1 and a document presser 2. A photoconductor 4 is placed horizontally on a copying machine main body 3, and a charging section 5, a developing section 6, a transfer section 7, and a paper separation section 8 are arranged around the photoconductor 4.
, a cleaning section 9 are arranged in this order in the rotational direction of the photoreceptor 4, an exposure device 10 with a moving optical system is arranged in the upper space of the copying machine main body 3, and the paper in the cassette case 11 is A paper feed conveyance device 12 that conveys the paper to the transfer unit 7, a paper discharge conveyance device 14 that conveys the paper after transfer and separation to the fixing device I3, and a tray 15 that conveys the paper after the fixation.
A pair of discharge rollers 16 are provided to discharge the paper.

A switchback paper passing path I7 for changing the moving direction of the paper after fixing is provided on the upper side of the fixing section 13, and the switchback paper passing path I7 is connected to the return direction path of the switch bank paper passing path 17. A paper passage path 18 for taking out the paper is provided on the lower side of the fixing section 13, and the fixing section 1
3 and the paper ejection roller pair 16, there is provided a path switching mechanism 19 that can freely switch between a state in which the fixed paper is ejected to the paper ejection roller pair 16 and a state in which the paper is ejected to the switch bank paper passage path 17. a stock section 20 for storing sheets of paper after single-sided copying taken out through the sheet take-out paper passing path 18 in the lower space of the copying machine main body 3;
A paper refeeding device 21 having a function to prevent double feeding is provided, and a paper refeeding path 22 is provided for returning the paper stored in the stock section 20 after single-sided copying to the paper feed conveyance device Z12.

Further, a paper passing path (mainly composed of the paper feed conveyance device 12 and the paper discharge conveyance device 14) extends from the cassette case loading section (paper feed section) 23 to the paper discharge roller pair (paper discharge section) 17.

), specifically the cassette case loading section 23.
. . . , and immediately upstream of the transfer section 7 and immediately downstream of the fixing section I3, jam detection means S .
As shown in FIG. 2, based on the jam detection information from the jam detection means S, the drive system of the paper passage path 12.14 extending from the paper feed section to the paper discharge section and the switchback paper passage path 17 are determined. and a drive system for the paper take-out and paper passage path 18, and
A drive stop means A is provided to stop each of the drive systems of the paper re-feeding path 22, and when the jam detection means S detects a jam, a jam occurrence detection means is provided to display where the jam has occurred. Location display panel (as mentioned above, displays the location causing the jam, for example, by blinking a lamp, and when the remaining jam detection means detects paper in the paper feed path, The detected location on the paper is displayed, for example, by lighting a lamp.)P is provided.

The configuration so far is the same as a conventional electrophotographic copying machine, and when the print switch is operated with the single-sided copy mode selected, the paper after transfer, separation, and fixing is taken out to the paper output tray 15. On the other hand, when the double-sided copy mode is selected and the print switch is operated, the paper after single-sided copying is firstly taken out to the stock section 20 via the switchback paper passage path 17 and the paper take-out paper passage path 18. At the time of the next back-side copying, the sheets after single-sided copying stored in the stock section 20 are sequentially fed to the transfer section 7 through the paper re-feeding path 22, and the sheets after double-sided copying are taken out to the paper ejection tray 15. It is.

Now, in the present invention, in the electrostatographic copying machine having the above configuration,
The present invention is characterized in that it is provided with first and second control means that cause the following sheet feeding mode to be adopted when a jam occurs during single-sided copying mode or single-sided copying in double-sided copying mode.

That is, when a jam occurs downstream of the transfer section 7 during one-sided copying, and there is untransferred paper on the upstream side of the transfer section 7, the cause of the jam after the transfer section is resolved. When the copying machine resumes operation after the photoconductor 4
At the same time, clean the untransferred paper and store it in the stock section 2.
A second control means is provided for causing the untransferred paper taken out to the transfer section 20 to be fed preferentially to the transfer section 7 when copying is resumed after the cause of the jam is resolved. A specific example of the control form will be explained based on FIGS. 2 and 3.

First, when the occurrence of a jam is detected in step S, the drive stop means A stops each paper passing path 12° 14.17.
．． 18. The drive system of 22 is stopped (step St), and the occurrence of the jam is displayed on the panel P (step S,).

Here, based on the blinking and lighting of the lamp, a jam processing step (step After step Sa) is completed, the paper remaining in the paper passing path is checked (step Ss).

If it is determined in step S that there is untransferred paper on the upstream side of the transfer section 7, the operation restarts, and the photoreceptor 4 is cleaned (step SV), and the path switching mechanism 19 is switched on. The paper is switched to the back paper passing path 17 side (step SS), and each paper passing drive system is driven (step S,), whereby the untransferred paper existing on the upstream side of the transfer section 7 is transferred to the stock section 20. At the same time as the sheets are taken out, the stock number N of the sheets taken out to the stock section 20 is counted (step S1°).

When the removal of the untransferred paper is completed, the process of restarting copying begins (the path switching mechanism 19 is connected to the paper output tray 15
can be switched to the side. ), and a message indicating that it is OK to resume copying is displayed (step S, 1).

Here, when the print switch operation (step S+z) is performed, it is determined in the next step S13 whether or not untransferred paper is stocked in the stock section 20, and then,
When untransferred paper is stored in the stock section 20, copying is performed by feeding paper from the stock section 20 (step 514) until N=O.

If copying of the set number of sheets is not yet completed even after copying is performed using the untransferred paper, copying is performed by feeding paper from the cassette case 11 (step S's), and during this time, step S0 is performed. When the occurrence of a jam is not detected and the set number of copies have been completed (step Sl?),
The operation of the device is then stopped.

As described above, by providing the first and second control means, the untransferred paper on the upstream side of the transfer unit 7 is not removed from the paper feeding path, and therefore, the untransferred paper is transferred to the cassette case 1.
Copying that reuses the untransferred paper can be performed immediately without the need for resetting the paper.

In this embodiment, a double-sided copying type electrostatic photocopying machine is used, but as shown in FIG. An electrostatographic copying machine of a so-called composite copying type (a copying type in which an image is superimposed on top of the copied image) is equipped with a path 24, and as shown in FIG. An electrostatographic copying machine in which the paper ejection passage path 25 is specially provided so as to be connected to the pre-fixing path, and furthermore, an electrostatic copying machine of a type in which the functions of the above two forms are added with a double-sided copying function. It is possible to implement the present invention.

〔Effect of the invention〕

As explained above, in the electrophotographic copying machine of the present invention, when a jam occurs in a situation where there is untransferred paper in the paper feed path leading to the transfer section, the electrophotographic copying machine of the present invention is capable of handling the paper that caused the jam and the transfer section By restarting the operation after performing a jam clearing process that removes only the paper, the untransferred paper is taken out to the stock section, and when copying is restarted, the untransferred paper taken out to the stock section is first transferred to the transfer section. The feature is that the untransferred paper is fed by paper feed, and when a jam occurs, it is necessary to take out the untransferred paper from the paper passing path and put it back into the cassette case, etc. This made it possible to immediately make copies that reused paper.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional side view of an electrostatographic copying machine, FIG. 2 is a block diagram, FIG. 3 is a flowchart of the control means, and FIGS. 4 and 5 are schematic diagrams of an electrostatic copying machine according to another embodiment. FIG. 4... Photoreceptor, 7... Transfer section, (17, 18), 2
4.25...Paper ejecting means (switchback paper passing route, paper taking out paper passing route), 20...Stock section, 22...Paper re-feeding means (re-feeding route), S...Jam Detection means. Applicant: Mita Kogyo Co., Ltd. Representative: Patent Attorney: Hideo Fujimoto Figure 2

Claims (3)

[Claims] (1) In the middle of the paper passing path from the paper feeding section to the paper discharging section, a jam detection means is provided to detect a jam in the paper passing path and stop the paper passing drive system, and the paper is stocked from the paper passing path. A paper take-out means for taking out the paper in the storage section and a paper re-passing means for returning the paper taken out to the stock section to the middle of the paper passing path before transfer are provided. a first control means for cleaning the photoreceptor and taking out the untransferred paper to the stock section when restarting operation when untransferred paper is present on the path leading to the storage section;
2. An electrophotographic copying machine, further comprising a second control means for feeding untransferred paper taken out to the stock section to the transfer section with priority when copying is resumed. (2) The electrophotographic copying machine according to claim 1, wherein the paper ejecting means comprises a switchback paper passing path for double-sided copying and a paper ejecting paper passing path. (3) The electrophotographic copying machine according to claim (1), wherein the paper ejecting means comprises a paper ejecting path for composite copying.