JPH03120139A - Picture forming device - Google Patents

Abstract

PURPOSE:To easily perform jam processing by automatically collecting even any transfer paper, not in use, which exists in the upstream side of a conveying path, in a reusable condition, when a paper jam is detected on a conveying roller in the downstream side from a transcription part. CONSTITUTION:When a paper jam is detected on a conveying path 2a in the downstream side from a transcription part 6, a conveying mechanism on the conveying path 2a is stopped simultaneously with transfer paper, not in use, existing from paper feed parts 18a to 18d via branch parts 19a to 19d over a conveying path 2b or branch conveying paths 20a to 20c, moved onto the conveying path 2b or branch-conveying paths 20a to 20c by normally rotating feed rollers 22a to 22d of the branch parts 19a to 19d. Thereafter by selecting guide plates 21a to 21d of the branch parts 19a to 19d to a side of a collecting tray 25 while reversely driving conveying mechanisms 11, 31 and the feed rollers 22a, 22d in the upstream side of the transfer part 6, transfer paper on and after the third sheet is collected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image forming apparatus that continuously feeds transfer paper stored in a paper feed section to a transfer section provided on a conveyance path. Specifically, the present invention relates to an image forming apparatus having a function of automatically collecting unused transfer paper when a paper jam occurs on a transfer paper conveyance path.

[Prior art]

Conventionally, for example, in a copying machine, when a paper jam occurs on the conveyance path of transfer paper, all drive systems are immediately stopped.
Jam processing is performed. Therefore, in order to remove the jammed transfer paper, it is necessary to check not only the transfer paper that caused the paper jam, but also the condition of the transfer paper being conveyed before and after it, which makes it extremely difficult to remove the jammed transfer paper. If there is a forgotten transfer paper, it may cause a paper jam to occur again, and the transfer paper that did not cause a paper jam may be damaged or wasted when removed.

In recent years, for the purpose of solving the above-mentioned problems, a copying machine equipped with a transfer paper removing device has been proposed, for example, in Japanese Utility Model Publication No. 59-9228.

The drive system that conveys the transfer paper is divided into two parts, one upstream and downstream of the registration rollers just before the photoreceptor, and if a paper jam occurs on either side, the drive system for that part is immediately stopped, and the other part is stopped immediately. The system is configured so that the transfer paper drive system is stopped with a slight delay, the transfer paper conveyance path is switched, and the transfer paper that has not caused a paper jam is automatically ejected, so that only the transfer paper that has caused a paper jam can be removed. has been done.

[Problem to be solved by the invention]

However, in the above-mentioned conventional copying machine, if a subsequent unused transfer sheet reaches the registration rollers when a paper jam occurs, this transfer sheet will be pinched by the registration rollers that are in a stopped state. It cannot be recovered because it has been

Therefore, an object of the present invention is to remove any unused transfer paper present on the upstream side of the conveyance path when a paper jam is detected, for example, on the conveyance path downstream of the photoreceptor constituting the transfer section. An object of the present invention is to provide an image forming apparatus having a function of automatically collecting a quantity in a usable state and easily disposing of a jam.

[Means to solve the problem]

In order to achieve the above object, the first means adopted by the present invention is to continuously feed the transfer paper stored in the paper feed section to the transfer section thrown onto the conveyance path. In the image forming apparatus, the conveyance mechanism on the conveyance path is separately driven on the upstream side and the downstream side of the transfer section, and the downstream side is connected to at least one or more of the paper feed sections via a branch section communicating with the conveyance path. a collection section that connects the branch conveyance path, sequentially connects the upstream side of the branch conveyance path and the downstream side of the branch section corresponding to the other paper feeding section, and further stores the transfer paper in the most upstream branch conveyance path; is provided, and when a paper jam is detected on the conveyance path downstream from the transfer section, the branch section is switched to the collection section side, and the conveyance mechanism and the branch section on the upstream side of the transfer section are reversed, and the transfer section on the conveyance path upstream from and/or
Alternatively, in the image forming apparatus, unused transfer paper present on the branch conveyance path is collected in the collection section.

Furthermore, the gist of the second means adopted by the present invention is that in an image forming apparatus that continuously feeds transfer paper stored in a paper feed section to a transfer section provided on a conveyance path, The conveyance mechanism on the conveyance path is driven separately on the upstream side and the downstream side of the transfer section, and a branch conveyance path is connected to at least one or more of the paper feed sections via a branch section whose downstream side communicates with the conveyance path. The upstream side of the branched conveyance path and the downstream side of the branched section corresponding to the paper feed section of the pond are sequentially connected, and a collection section for storing transfer paper is provided in the most upstream branched conveyance path, and the transfer paper is collected from the transfer section. When a paper jam is detected on the downstream conveyance path, the unused transfer paper that is present from the paper feed section, through the branch section, and the conveyance entanglement or branch conveyance path is rotated forward through the branch section. After moving it onto the transport path or branch transport path, the branch section is switched to the collecting section side, and the transport mechanism and branch section upstream of the transfer section are reversed to move it from the transfer section to the transport path upstream. and/or the image forming apparatus according to the present invention, wherein all unused transfer paper existing on the branch conveyance path is collected in the collection section.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

Here, FIG. 1 (al is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention, and A in the same figure + al)
FIG. 2 is an enlarged view of the section viewed from the arrow, FIG.

In the copying machine according to this embodiment, FIG. 1 (51), (b
l.

As shown in IO), photosensitive drums 3. A transfer section 6 including a transfer charger 41, a separate charger 5, etc. is provided. On the conveyance path 21 downstream from the transfer section 6, there is a conveyor 7, a pair of fixing rollers 8. A paper ejection switch 9, a pair of paper ejection rollers 10, etc. are provided. On the conveyance path 2 on the upstream side from the transfer section 6, a pair of registration rollers 11. Registration switch 12
etc. are provided. These transport mechanisms are driven separately on the upstream side and downstream side of the transfer section 6, and
The registration roller pair 11 can be rotated in reverse.

Inside the mounting table 13 on which the copying machine main body 1 is placed, there are provided, for example, four stages of paper feed cassettes 14m to 14J. Transfer papers of various sizes are housed in 14J to 14J.

Then, each paper feed cassette 14. The transfer sheets in 14J to 14J are continuously fed toward the transfer section 6 by sequential rotation of each sheet feed roller 151 to 15j.

Each of the paper feed cassettes) 14m to 14J has a transfer paper guide path 16. 16- to 16- are connected, and a feed switch 1 is connected to each of the answer guide paths 161 to 16-.
7. 17J to 17J are provided.

In this case, each paper feed section 18. to 1
8- is configured.

Each of the above paper feed sections t8. Branch conveyance paths 20a to 20- are connected to branch conveyance paths 20a to 18J via branch portions 191 to 194 whose downstream sides communicate with the conveyance path 2b, respectively.

Said branch part 19. (As shown in C1, guide plates 21. to 21-, which switch the conveyance path of the transfer paper in a switch bank manner, and the drive system on the copying machine main body 1 side are driven separately from each other. - Reversely rotatable feed rollers 22. to 22J and the above feed rollers 22. to 2
Auxiliary roller 23 is arranged so that its axis is substantially perpendicular to feed roller 2a and is pressed against feed rollers 221 to 22-. to 23J and 24. ~24J
It is configured with the following.

In this case, for example, the paper feed roller 151
together with the feed roller 22. is rotated counterclockwise (
At the same time, the guide Fi21 is driven to swing to the position shown by the solid line, so that the paper feed cassette
The transfer paper in 4a is fed toward the transfer section 6.

On the other hand, the guide plate 21. is driven to swing to the position shown by the two-dot chain line, and at the same time, the feed roller 221 is rotated clockwise (reversely), so that the transfer paper on the transfer unit 6 side is transferred to the paper feed cassette 14&. Instead of returning, it is transported to a collection tray 25 (recovery unit) side, which will be described later, in a switch bank manner.

Branch portion 19 configured as described above. Of branch parts 19. to 19J, which are located on the downstream side of the eel. The downstream side thereof is connected to the conveyance path 2 which extends toward the mounting table 13 side. The downstream sides of the pond branch sections 19s to 19J are sequentially connected to the upstream sides of the branch conveyance paths 2G to 20c corresponding to the other paper feed sections 1B□ to 18c.

Further, the collection tray 25, which stores unused transfer paper in a reusable state, is connected to the branch conveyance path 20- located on the most upstream side. Then, the branch conveyance path 20
A pair of collection rollers 26 that are driven to rotate in the opposite direction and a discharge switch 27 that detects the discharge of the transfer paper to the collection tray 25 are provided at the connection portion between J and the collection tray 25 .

Further, the conveyance path 2t and the branch conveyance path 20° to 20
Conveyance switches 28, 29, and 30 for detecting passage of transfer paper are provided at appropriate locations on J. Further, the copying machine main body 1
A pair of feed rollers 31 are provided which are driven separately from the sides and can rotate in forward and reverse directions.

The copying machine according to this embodiment is configured as described above.

In the above-mentioned copying machine, for example, the conveyance path 2 on the downstream side from the transfer section 6. When a paper jam is detected on the transport path 2. The upper conveyance mechanism is stopped, and the paper feed section 18. The third and subsequent sheets of unused transfer paper that are present from 18- to 18-, through branch portions 19° to 19J, to conveyance path 2T or branch conveyance path 2G to 20c are transferred to branch portion 19. Feed rollers 22. to 19a. By normal rotation of 22- to 22-, the above transport path 2 or branch transport path 201
20c. Thereafter, the branch section 19.
Guide plates 21. to 19J. 〜21J is collection tray 2
At the same time, the transport mechanism on the upstream side of the transfer section 6 (registration roller pair 11 and feed roller pair 31
), the feed rollers 221 to 22a1, and the collection roller pair 26 are driven in the reverse direction, so that the third and subsequent sheets of unused transfer paper are collected into the collection tray 25. Further, the second unused transfer paper present on the transport path 2 and/or the branch transport path 20m+20b on the upstream side from the transfer section 6 is also collected in the collection tray 25.

Thereafter, the conveyance path 28 is processed for jamming.

Continuing on, based on FIG. 1 and FIG. 2, a specific processing procedure when a paper jam occurs in the copying machine will be explained.

In addition, in FIG. 2, Sl, S2. ...indicates each operation step.

In addition, in this apparatus, the presence or absence of a paper jam on the conveyance path and the passage of the transfer paper are determined by the paper ejection switch 9. Registration switch 12. Conveyance switches 28 to 30. Feed switch 17. to 17J.

It is detected by the discharge switch 27, and based on output signals from these switches, on/off control and forward/reverse rotation drive control of the transport mechanism on the transport path is performed.

In this device, during the copying process, the presence or absence of a paper jam on the transport path is constantly monitored (Sl), and after waiting for the copying process to be completed without any paper jamming (S2), all drive systems are turned off. It is stopped (S3).

On the other hand, a paper jam occurred on the above conveyance path (
Sl), if it is determined that this paper jam does not occur in the part related to the copying machine main body 1 (S4), the feed roller pair 31 and the feed rollers 22 to 22- on the conveyance path related to the part where the paper jam occurs The rotation of is stopped (S5).

At this time, if the copying operation is performed in the copying machine main body 1 (S6), only the drive system related to the copying machine main body 1 is drive-controlled, and the copying operation is continued (S7).
.

Further, if it is determined that a paper jam has occurred on the conveyance path of the copying machine main body 1 during the operation of the copying machine (38),
The drive system related to the copying machine main body 1 is also stopped (S9), and the area where the paper jam has occurred is displayed on the operation panel in 310, after which the jam removal is performed by the operator.

In S4, for example, the conveyance path 2 of the copying machine main body l
If a paper jam of the first transfer paper 32 is detected on the conveyance path 21, the drive system (II conveyor 7
, the pair of fixing rollers 8, the pair of paper ejecting rollers 10, etc.) are stopped (311), and if it is determined in 312 that the first and second sheets of transfer paper are being fed (in this embodiment, An example is shown in which the transfer paper 33 reaches the pair of registration rollers 11), the transport roller 21 involved in transporting the transfer paper 33. Upper registration roller pair 11. The rotation of the feed roller pair 31 is stopped (813).

Subsequently, in S14, it is determined whether or not the feeding of the third sheet of transfer paper has started, and if it is determined that the feeding of the third sheet of transfer paper has started (this embodiment Here, the transfer paper 34 fed from the fourth paper cassette 14-
An example is shown in which the feed rollers 22I to 22J, which are involved in conveying the transfer paper 34, are driven in normal rotation (
S15), in this case, the guide plate 21a of the branch part 194
In the first rotation), only the guide plates 21. 21c to 21c are oscillated to positions indicated by two-dot chain lines in the figure.

Then, in S16, if it is determined that the rear end of the transfer paper 34 has passed through the branch section 19J and reached the branch conveyance path 20c (the feed switch 17d causes the transfer paper 34 to
(judged when a predetermined period of time has elapsed since it was detected that the rear end has passed), the guide plate 21j is switched, and the pair of registration rollers 11. Feed roller pair 31
．． Feed roller 22. ~22J9 collection roller pair 26
is driven in reverse rotation (S17).

If it is determined in step 518 that the transfer sheets 33 and 34 have been collected in the collection tray 25, the rotation of all rollers is stopped (S19), and the portion where the paper jam occurred is displayed on the operation panel. (520).

After that, the jam removal is performed by the operator.

The completion of collection of the transfer sheets to the collection tray 25 in step 518 is determined by whether or not the number of transfer sheets remaining on the conveyance path matches the number of on/off signals from the ejection switch 27. This is done by

Therefore, according to the device of this embodiment, when a paper jam occurs,
For example, even if unused transfer paper reaches registration roller pair 11, the unused transfer paper can be automatically collected in a reusable state, and jam removal can be easily carried out. .

Although the apparatus of this embodiment has been described using an example in which four paper feed cassettes are provided, it is also possible to configure the apparatus with only one paper feed cassette.

In this case, in FIG. 1 (Hata), the paper feed section 18. A recovery tray 25, a pair of recovery rollers 26, and an ejection switch 27 are provided on the upstream side of the branched conveyance path 201 corresponding to .

〔Effect of the invention〕

Since the present invention is configured as described above, for example, when a paper jam is detected on the conveyance roller downstream from the transfer section, any unused transfer paper present on the upstream side of the conveyance path can be reused. It is possible to automatically collect the paper in a safe condition and easily perform jam disposal.

[Brief explanation of drawings]

FIG. 1(a) is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention, FIG. B arrow side view in
FIG. 2 is a flowchart showing a processing procedure when a paper jam occurs in the image forming apparatus. [Explanation of symbols] 1... Copying machine main body 2.21+ 2b... Conveyance path 6... Transfer section 11... Registration roller pair 12... Registration switch 14, to 14-... Paper feed Cassettes 16 to 16a...Guide paths 17 to 17J...Feed switches 181 to 1
8-... Paper feed section 19, to 19J... Branch section 20□ to 2L... Branch conveyance path 211 to 21J... Guide plate 221 to 22a... Feed roller 23. to 23
J, 241 to 24a 25...Collection tray (collection section) 28 to 30...Transport switch 31...Feed roller pairs 32 to 34...Transfer paper Sl to 520...Operation step...Auxiliary roller

Claims (1)

[Scope of Claims] 1. In an image forming apparatus in which transfer paper stored in a paper feeding section is continuously fed to a transfer section provided on a conveyance path, the conveyance mechanism on the conveyance path is connected to the transfer section provided on the conveyance path. The upstream side and the downstream side are driven separately, and the downstream side connects a branch conveyance path to at least one or more of the above-mentioned paper feed sections via a branch section that communicates with the above-mentioned conveyance path, and the upstream side of the branch conveyance path and the other paper feed section are connected to each other. The paper section is sequentially connected to the downstream side of the branch section corresponding to the paper section, and a collecting section for storing the transfer paper is provided in the branch conveyance path on the most upstream side, and a paper jam is detected on the conveyance path downstream from the transfer section. At this time, the branching section is switched to the collecting section side, and the transport mechanism and branching section upstream of the transfer section are reversed to remove unused materials existing on the transport path upstream from the transfer section and/or the branch transport path. An image forming apparatus characterized in that the transfer paper is collected in the collection section. 2. In an image forming apparatus in which transfer paper stored in a paper feed section is continuously fed to a transfer section provided on a conveyance path, the conveyance mechanism on the conveyance path is separated into upstream and downstream sides of the transfer section. A branch conveyance path is connected to at least one or more of the paper feed sections via a branch section whose downstream side communicates with the conveyance path, and a branch corresponding to the upstream side of the branch conveyance path and the other paper feed section. A collecting section is provided which stores the transfer paper in the branch conveyance path on the most upstream side, and when a paper jam is detected on the conveyance path downstream from the transfer section, the paper feed section The unused transfer paper existing on the conveyance path or the branch conveyance path through the branch section is moved to the conveyance path or the branch conveyance path by normal rotation of the branch section, and then the branch section is moved to the conveyance path or the branch conveyance path. At the same time, the conveyance mechanism and the branching section on the upstream side of the transfer section are reversed, and all unused transfer paper existing on the conveyance path upstream from the transfer section and/or the branch conveyance path is transferred to the collection section. An image forming apparatus characterized in that it is collected.