BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a sheet conveying apparatus for an electrophotographic
copying machine, a printing press, a printer, an automatic document feeder (ADF) or
the like, more specifically to a paper jam treatment technique.
Related Background Art
[0002] In the past, it was the most efficient measures for a paper jamming treatment incidental
to the sheet conveyance in this kind of sheet conveying device for such as an electrophotographic
copying machine and a printer that the subsequent sheet was not allowed to be conveyed
before a sheet of copying paper had been completely ejected from the apparatus so
that the treatment could be completed if only the jammed sheet was removed. Such paper
conveying system was applicable to a low-speed small sized machine, but not suitable
for a high-speed large sized machine. An improved sheet conveying apparatus was therefore
employed in which the interval of sheet conveyance was set as short as possible to
in order to speed up with regard to the high-speed large sized machine. Such sheet
conveying apparatus could be, for example, utilized for image forming apparatus to
obtain a high-productivity per hour.
[0003] On the other hand, due to development of multi-function such as color copy and multiple
copy, the distance of sheet conveyance was liable to be elongated with the result
that the number of sheets resting on the conveyance path was increased in the above-mentioned
image forming apparatus.
[0004] There has been also proposed a sheet conveying apparatus which was adapted for the
automatization of collation or finishing process by connecting an output sheet processing
apparatus such as a sorter or a finisher therewith as well as aforementioned development
of speed-up and multi-function.
[0005] However, in the prior art described above, the entire conveying operation of sheet
conveying apparatus including output sheet processing apparatus stopped immediately
after paper jamming occurs in, for example, the output sheet processing apparatus.
As a result, the sheets being conveyed remained on the conveyance path, so that an
operator had to remove the remaining sheets as well as the jammed sheet in the output
sheet processing apparatus by inspecting the respective portions of the conveyance
path, resulting in a poor jamming treatment.
[0006] Specifically in the electrophotographic copying machine, the operator's hands were
soiled with unfixed toner when removing the jammed sheet between a photosensitive
body of image forming portion and a fixing device.
[0007] Furthermore, as the sheet supplying portion tended to have a further complicated
and elongated path for sheet conveyance, there were more points to be inspected for
remaining sheets. Accordingly the inspection and removal of the jammed paper was a
time-consuming, and a lot of time was required for jam return, in other words, normalization
of the apparatus.
[0008] Moreover, some sheet conveyance apparatus in the use of an electrophotographic copying
machine, etc., functioned to automatically eject the sheets on the conveyance path
from the apparatus without removing the sheets on the path one by one providing jammed
sheet was treated (referred to as autoclear function). However, the sheet which was
stopped on the pass in the middle of image forming caused to have a defective image,
thereby being discharged as a mere miss sheet. In consequence, there was a drawback
that aforesaid miss sheets and normal sheets were mingled to disorder pages of the
sheets.
SUMMARY OF THE INVENTION
[0009] The present invention was conceived to overcome the above problem in the prior art,
and the main object thereof is to provide a sheet conveying apparatus in which the
sheets being conveyed on the conveyance path are gathered at a predetermined place,
enabling the removal of sheets to be easily performed and prompt jam return.
[0010] In order to achieve the above object a sheet conveying apparatus according to the
present invention has a jam detecting means by which the sheet conveyance is stopped
in case of jam occurrence to carry out a jam treatment, in which there are provided
an accommodating portion for jam treatment leading to aforementioned conveyance
path, and a conveyance control means to accommodate the sheets being conveyed on the
conveyance path into the accommodating portion for jam treatment when the jam detecting
means senses a paper jamming.
[0011] The present invention with above constitution enables all the sheets on the conveyance
path to be gathered in the accommodating portion of jam treatment in case of paper
jamming by putting away the same into the accommodating portion.
[0012] According to the present invention, there is also provided a conveyance controlling
portion which controls so as to accommodate the sheet being conveyed on the conveyance
path into the accommodating portion for jam treatment, so that all the sheets can
be removed in a lump with no need to remove the sheets resting on the different places
of the conveyance path one by one as in the past, rendering the removal treatment
(jam treatment) easier.
[0013] Moreover, the present invention was also conceived to overcome the second problem
in the prior art mentioned above, and the object is to provide a sheet conveying apparatus
in which the sheets being conveyed on the conveyance path are discharged into a predetermined
place, thereby enabling easier removal of jammed and other enclosed sheets of copying
paper and prompt jam return.
[0014] It is still further object of the present invention to provide a sheet conveying
apparatus in which the occurrence of miss sheets can be reduced while predetermined
image formation is carried out onto the sheets being conveyed.
[0015] In order to achieve the objects mentioned above, a sheet conveying apparatus has
a jam detecting means for sensing a paper jamming, thereby stopping conveying the
sheet on the conveyance path in case of jam occurrence, wherein there are provided
a standby accommodating portion for discharge which is arranged to accommodate the
sheets being conveyed on the conveyance path when paper jamming is sensed with the
aid of aforementioned jam detecting means, and a discharged means which rejects the
sheets being put away in the standby accommodating portion for discharge. There are
also provided an image forming portion which carries out a predetermined image formation
on aforesaid sheet, and an image forming controlling means which functions to perform
the image formation on the sheets being put away in the standby accommodating portion
for discharge. In addition, it is more effective to prohibit a further image forming
which causes the disturbance of the image previously formed on the sheets.
[0016] According to the second invention having the above constitution, all the sheets resting
on the conveyance path are accommodated in the standby accommodating portion for discharge
to be gathered in the predetermined place, making ready to be discharged outside
the apparatus after jam return. There is also provided an image forming portion to
carry out the image formation onto the sheets to be put away in the standby accommodating
portion for discharge, thereby preventing miss sheets from occurring. Furthermore,
since image forming is prohibited during the rejection of sheets, the image previously
formed on the sheets is not to be disturbed.
[0017] According to the present invention, in case of jam occurrence, the sheets being conveyed
on the conveyance path are temporarily accommodated in the standby accommodating portion
for discharge and then rejected outside the apparatus after jam return. As a result,
the apparatus has an advantage that there is no need to remove the sheets lying scattered
on the conveyance path one by one as in the past, instead the sheets to be discharged
can be removed collectively, thereby rendered the removal process or jam treatment
easier, preventing the paper jam from occurring again due to the carelessly remaining
jammed sheet, and shortening and downtime to be required for jam return.
[0018] Because of the image forming portion which is provided to carry out the image formation
onto aforesaid sheets to be accommodated, the sheet on the conveyance path can be
discharged as a regular output sheet, thereby reducing the occurrence of miss sheets.
[0019] In addition, image formation is prohibited when the sheets are discharged, so that
the image previously formed on the sheets is not to be disturbed, leading to the maintenance
of the quality of image on the sheets.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020]
Fig. 1 is a block diagram of a copying machine incorporating a sheet conveying apparatus
according to one embodiment of the present invention.
Fig. 2 is a flow chart showing a jam treatment controlling procedure according to
the present invention;
Fig. 3 is a structural cross-sectional view of a copying machine adopting a sheet
conveying apparatus according to one embodiment of the present invention;
Fig. 4 is a structural cross-sectional view showing the movement of the copying machine
illustrated in Fig. 3 in case of jam occurrence;
Fig. 5 is a block diagram of a copying machine applying a sheet conveying apparatus
according to the second embodiment of the present invention;
Fig. 6 is a flow chart showing a jam treatment controlling procedure according to
the second embodiment of the present invention;
Fig. 7 is a structural cross-sectional view of the copying machine incorporating a
sheet conveying apparatus according to the second embodiment of the present invention;
Fig. 8 is a structural cross-sectional view showing the movement of the sheet accommodation
in case of jam occurrence of the copying machine illustrated in Fig. 7; and
Fig. 9 is a structural cross-sectional view showing the movement of sheet discharge
after jam return of the copying machine illustrated in Fig. 7.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] The present invention will hereinafter be described in detail with reference to the
accompanying drawings.
[0022] Fig. 3 is a structural cross-sectional view showing a copying machine applying a
sheet conveying apparatus according to one embodiment of the present invention.
[0023] In the figure, a copying machine body 100 is equipped with an image forming portion
101, a conveying portion 102 which defines a conveying path along the image forming
portion 101 to convey sheets S (recording media), and reconveying means 200 possessing
a both sides processing function by which sheets S are turned over to be recorded
on both sides thereof, and a multiple recording function by which the same recording
face can be recorded a plurality of times. The re-conveying means 200 opening into
the conveying portion 102 has an intermediate tray 201 for accommodating the sheets
which have passed the image forming portion 101, the intermediate tray serving as
an accommodating portion for jam treatment according to the present invention. Reference
numeral 300 designates a circulating document feeder (referred to as "ADF" hereinafter),
numeral 400 denotes a sorting device for accommodating the sheets S which have already
been recorded into a plurality of bin tray 401 (hereinafter referred to as "Sorter"),
and numeral 500 represents a pedestal provided with a deck 501 for accommodating a
great number of sheets S (for example, 200 sheets). These apparatus, the ADF 300,
the sorter 400, and the pedestal 500 can be optionally combined with relation to the
copying machine 100. The ADF 300 is mounted on the platen glass 103 of the copying
machine and the sorter 100 is connected to an output side, down-stream of a discharging
roller 105. Sheets S which is supplied through a deck 501, cassettes C₁, C₂, or a
manual paper feed inlet C₃, after adjusting the conveying timing by means of a regist
roller 105, are conveyed along the image forming portion 101 with the aid of the conveyance
portion 102. By using a well-known electrophotographic process, a toner image developed
on the photosensitive drum 106 is transferred and fixed onto the sheets S by means
of a fixing device 107. A flapper 108 is provided just downstream of the fixing device
107, whereby the conveyance path is alternatively led through the conveyance portion
102 either to the sorter 400 following the discharging roller 104 or to the intermediate
tray 201 of the re-conveyance means 200. Now during image forming in continuous copying
operation, suppose that n-th sheet (shown by
n in the figure) is jammed in the sorter 400. At this time, e.g., in the bin tray 401
already output sheets from 1st to (n-1)th are accommodated, (n+1)th sheet resting
at the fixing device 107 disposed in the upsteam of discharging roller 104, (n+2)th
sheet being in contact with the photosensitive drum 106, and (n+3)th sheet being located
in the position just after the deck 501. A document corresponding to the (n+2)th sheet
is mounted on the platen glass 103, which is about to be replaced by the document
corresponding to the (n+3)th sheet. Paper jamming in the sorter 400 is detected by
means of photo-sensor 402 serving as a jam detecting means.
[0024] In the prior art, a sorter jamming due to the n-th sheet stopped all conveyance of
the copying machine 100, while in the present invention any sheets do not remain on
the conveyance path as shown in Fig. 4. Adjacent to the 108 there is provided a sensor
109 by which the presence or absence of sheet can be detected. Providing that any
sheets preventing the movement of the flapper 108 is not present, and therefore sheets
on the conveyance path can be accommodated into the intermediate tray 201, the flapper
108 is operated so as to lead the conveying portion 102 into the intermediate tray
201, thereby accommodating the sheets on and after (n+1)th into the intermediate tray.
On the way to the intermediate tray 201, another flapper 202 is provided on the conveyance
path which acts to selectively change over reverse or non-reverse mode for sheets
corresponding to whether the image is formed on the opposite side or superimposed
on the same side.
[0025] In non-reverse mode, the sheets are directly guided to a discharge gate 203 and stacked
up, with the image formed surface downward, through the discharge gate 203 corresponding
to the sheet size. In reverse mode, the sheets are temporarily led to a reverse path
(switch-back path) 204, guided to the discharge gate 203 with the trailing edge thereof
ahead, and is accommodated to stack up with the image formed surface upward. In case
of jam occurrence, the conveying operation in the copying machine 100 is not interrupted,
so that (n+3)th sheet in the position just after feeding as shown in Fig. 3 could
be conveyed into the accommodating portion, and accommodated in the intermediate tray
201 before long.
[0026] Fig. 1 shows the block diagram of the copying machine adopting the sheet conveying
apparatus according to one embodiment of the present invention, wherein the identical
structures thereof to those shown in Figs. 3 and 4 are marked with identical signs
to those in these figures. In Fig. 1, reference numeral 1 designates a controlling
portion which controls entire operation of the copying machine. In case paper jamming
takes place in the sorter 400 and the jam signal is inputted with the aid of the photo-sensor
402, the controlling portion 1 controls the flapper 202, discharge gate 203 or the
like in such a way that the sheets being conveyed and adapted to be accommodated into
the intermediate tray 201 are caused to be accommodated therein after making sure
that there are no sheets to prevent the movement of the flapper 108. The control portion
1 also controls the movement of several portions in accordance with the respective
key commands of the operating portion 2 and permits the displaying portion 3 to indicate
a message and the like according to the operating condition.
[0027] A control procedure for jam treatment in the control portion 1 illustrated in Fig.
1 will now be described in accordance with the flow chart shown in Fig. 2.
[0028] In the first place, the controlling portion 1 stands by for paper jamming which occurs
in the sorter 400 etc. (Step 601), and stops immediately the operation of the sorter
400 while continuing the conveying operation in the machine (Step 602).
[0029] In the second place, the controlling portion 1 detects the sheets which makes the
flapper 108 inoperative with the aid of the sensor 109 (Step 603), actuates the flapper
108 so as to accommodate the sheets being conveyed into the intermediate tray 201
when there are no sheets to be found (Step 604), actuates the flapper 202 according
to the reverse/non-reverse mode of the sheets (Step 605), and leads the sheets on
the conveyance path to the discharge gate 203. The discharge gate 203 is changed over
in accordance with the sheet size (Step 606), and the sheets are accommodated in the
intermediate tray 201 (Step 607).
[0030] Afterward, the controlling portion 1 confirms whether the sheets are present or not
on the conveyance path by the signal of well-known jam detecting device (not shown
in the figure) disposed at several points of the conveyance path, judges whether all
the sheets on the conveyance path have been accommodated into the intermediate tray
201 (Step 608) and stops the conveying operation of the copying machine 100 when judged
"YES" (Step 609) to complete the process.
[0031] On the other hand, when judged "NO" at Step 6, it instructs to jump to Step 609 therefrom,
whereby the conveying operation of the copying machine 100 is stopped at once to complete
the process. Moreover, the displaying portion 3 indicates appropriate display when
paper jamming takes place.
[0032] As discribed above, the sheets on the conveying path can be gathered into the intermediate
tray 201 by incorporating the sheet conveying apparatus according to the present
invention, for example, into a copying machine, so that all the sheet can be removed
at one time, thereby eliminating the troublesome process of removing the sheet lying
scattered at several places on the conveyance path one by one with close inspection.
Furthermore, the use of existing intermediate tray 201 leads to space and cost efficiency
compared to that of newly manufactured accommodating tray and ensures the reliability
of the copying machine. As well as soiling of operator's hands with the unfixed toner
in the vicinity of the fixing apparatus, re-occurrence of paper jamming due to carelessly
remaining jammed sheet can be prevented, and down-time required for jam return is
to be shortened.
[0033] When the sheets are accommodated into the intermediate tray 201, they may be carried
in either mode of reverse or non-reverse, and regardless of the method thereof.
[0034] In the above embodiment, the sorter jam is typically shown, but the present invention
is also effective against paper jamming at the discharge portion of the apparatus
body (discharge roller 104) or ADF 300. In this case, it is necessary that the conveyance
path leading to the intermediate tray 201 is maintained operative, while stopping
only the operation of the discharge portion or ADF 300 being subjected to paper jamming.
[0035] In the above description, the sensor 108 is disposed just before the flapper 108
to judge whether to accommodate the sheets into the intermediate tray 201 or not.
However the sensor 109 is not necessarily indispensable means, instead a sensor (existing
one available) located at the upstream of the flapper 108 and a standard pulse generating
means may be used in combination, whereby the position of the sheets on the conveyance
path could be detected to make the above judgement.
[0036] In the above embodiment, a sheet conveying apparatus is applied to an electrophotographic
copying machine based on optical information, otherwise this invention is applicable
to a printer based on electronic information, a printing press, an ADF serving as
a sheet conveying apparatus, or the like. In addition, the accommodating portion for
jam treatment may be provided at several places as long as jam treatment is facilitated
thereby.
[0037] Next the second embodiment of the present invention will be described in detail with
reference to the accompanying drawings, Figs. 5 to 9. In this embodiment, the sheets
being put away in the standby accommodating portion for discharge is to be ejected
outside the apparatus after jam treatment. Accordingly, the description of the same
operations as those in the first embodiment will be omitted, and the procedure after
jam treatment will be described in detail.
[0038] When the jammed sheet
n is taken off and proper jam treatment is conducted, the sheets being accommodated
in the intermediate tray 201 are discharged outside the apparatus as shown in Fig.
9. The sheets are again fed from the intermediate tray 201 into the conveying portion
102 by means of the paper feed roller 205. In order to know the completion of re-feed,
one may previously count the number of sheets being accommodated in the intermediate
tray by means of a memory, etc., or may provide a sensor in the intermediate tray
201, thereby detecting the running out of re-feed sheets. The conveying portion 102
opens into the sorter 400 through the flapper 108 and the sheets are discharged onto
the other tray 403 than the bin tray 401 on which the sheets were ejected before as
shown in the figures. The sheets may be discharged on the bin tray 401 where the sheets
have already piled up.
[0039] Furthermore, when the sheets on the conveyance path are accommodated into the intermediate
tray due to jamming in the sorter as shown in Fig. 8, image forming can be normally
carried out onto the sheets. In other words, the sheets are to be accommodated into
the intermediate tray after image forming thereon as usual. In this case, when the
sheets are subsequently discharged, it is desirable that white image (no image) be
overlaid to be multiple images in order not to disturb the image which has already
been formed on the sheet. In order to procure a similar effect, image forming operation
at the image forming portion 101 may be made inoperative, more specifically, a blank
exposure may be entirely applied onto the photosensitive drum 106 in such a way that
latent image is not to be formed regardless of the document to be mounted on the platen
glass 103. It may be otherwise conceived that the developing device 110 is not made
to be actuated, or that the toner image is not made to be transferred onto the sheet
by breaking the corona of a transfer electrifying device 111. With above constitution,
the sheet on the conveyance path which was disposed of as a miss sheet in the past,
can be used as a regular output sheet.
[0040] Fig. 5 designates a block diagram of the copying machine illustrated in Figs. 7 -
9 applying a sheet conveying apparatus according to the second embodiment of the present
invention. In the figure, the same numerals or signs denote identical members to those
in Figs. 1 - 4 and Figs. 7 - 9.
[0041] Reference numeral 1 represents a controlling portion which controls the entire operation
of the copying machine, and which has an accommodation controlling means 1a, a discharge
controlling means 1b, an image forming controlling means 1c and the like. The accommodation
controlling portion 1a allows the sheets being conveyed on the conveyance path to
be accommodated into the intermediate tray, when for example, the photo-sensor 402
detects a paper jamming. After completing jam treatment, the discharge controlling
portion 16 causes the re-conveying means 200 to re-supply the sheets being accommodated
in the intermediate tray 201 into the conveying portion 102, and then causes the sorter
400 to discharge the sheets outside the apparatus, according to the jam clear signal
which is input by pressing a jam reset switch 404. The image forming controlling portion
1c allows the image forming portion 101 to form a predetermined image onto the sheets,
carries out the image forming onto the sheets which is accommodated in the standby
accommodation portion for discharge, and prohibits newly image forming which disturbs
the image which has been already formed on the sheets in case of sheet discharge.
The controlling portion 1 controls the operations of several portions in accordance
with the respective key commands of the operating portion 2, and allows the displaying
portion 3 to show the message, etc., according to the state of operation.
[0042] A jam treatment controlling procedure in the controlling portion illustrated in Fig.
5 will be hereinafter described in accordance with Fig. 6.
[0043] In the first place, the controlling portion 1 stands by for a paper jamming which
takes place in the sorter 400 etc. (Step 601), and stops the operation of the sorter
400 immediately while proceeding with the conveyance in the machine and the image
forming in case of a sorter jam (Step 602).
[0044] In the second place, the accommodation controlling portion 1a detects, if any, the
sheets which will bring about an inoperativeness of the flapper 108 by means of the
sensor 109 (Step 603), actuates the flapper 108 to accommodate the sheets being conveyed
into the intermediate tray 201 when there is no sheets to be found (Step 604), actuates
the flapper 202 according to the reverse/non-reverse mode for the sheets (Step 605),
and guides the sheets on the conveyance path to the discharge gate 203. The discharge
gate 203 is changed over according to the sheet size (Step 606), and allows the intermediate
tray 201 to accommodate the sheets (Step 607).
[0045] In the following steps, the accommodation controlling portion 1a confirms the presence
or absence of the sheets on the conveyance path with the aid of the signal of such
as jam detecting device (not shown) which was disposed at several places on the conveyance
path in the prior art, judges whether all the sheets on the conveyance path have been
accommodated into the intermediate tray 201 (Step 608), and stands by for jam return
when judged "YES" (Step 609).
[0046] Afterward, when jam is cleared and jam cleared signal is input, the discharge controlling
portion 16 initiates discharge of the accommodated sheets (Step 610), judges whether
all the accommodated sheets have been discharged (Step 611), and stops the conveying
operation of the copying machine 100 when judged "YES" (Step 612), to complete the
process. In the course of above steps 610 - 612, there is prohibited an image formation
onto the sheets.
[0047] On the other hand, when judged "NO" at Step 603, the process jumps to Step 612 where
the conveying operation of the copying machine 100 and the image formation are stopped
at once to complete the process. Upon occurring of jam, the displaying portion 3 indicates
a proper display.
[0048] As described above, the sheets which have been temporarily accommodated into the
intermediate tray 201 is discharged into one bin tray of the sorter 400, so that it
is unnecessary to remove the sheets lying scattered on the conveyance path one by
one with careful inspection.
[0049] By incorporating the sheet conveying apparatus into an image forming apparatus such
as a copying machine, a regular image can be formed onto the sheets to be disposed
of, thereby reducing the number of miss sheets. Furthermore an existing intermediate
tray is utilized so that space and cost efficiency can be procured compared to a newly
provided accommodation tray, resulting in maintaining reliance of the copying machine.
[0050] In a sheet conveying apparatus having a jam detecting means, there are provided an
accommodating portion for jam treatment and a conveyance controlling means to accommodate
sheets on a conveyance path into said portion, enabling all the sheets on the path
to be gathered in one place and rendering the removal treatment easier. In another
aspect of this invention, in case of jam occurrence, the sheets being conveyed are
temporarily accommodated in the standby accommodating portion for discharge and then
rejected outside the apparatus after jam return, while an image forming portion carrying
out the image formation onto the sheets to be accommodated so that they can be discharged
as regular output sheets, and image formation being prohibited when the sheets are
discharged, resulting in that the image previously formed on the sheets is not to
be disturbed.
1. A sheet conveying apparatus having a jam detecting means which senses a sheet jam
to stop conveying sheets on a conveyance path thereby carring out a jam treatment
in case a jam occurs, comprising:
an accommodating portion for jam treatment communicating with said conveyance path;
and
a conveyance controlling means which allows said sheets being conveyed on said conveyance
path to be accommodated into said accommodating portion for jam treatment, when said
sheet jam is sensed by said jam detecting means.
2. A sheet conveying apparatus according to claim 1, wherein said accommodating portion
for jam treatment is an intermediate tray located in a recycling path.
3. An image forming apparatus provided with a sheet conveying apparatus having a jam
detecting means which senses a sheet jam to stop conveying sheets on a conveyance
path thereby carrying out a jam treatment in case a jam occurs, comprising:
an accommodating portion for jam treatment communicating with said conveyance path;
and
a conveyance controlling means which allows said sheets being conveyed on said conveyance
path to be accommodated into said accommodating portion for jam treatment when said
sheet jam is sensed by said jam detecting means.
4. An image forming apparatus according to claim 1, wherein said accommodating portion
for jam treatment is an intermediate tray located in a recycling path.
5. A sheet conveying apparatus having a jam detecting means which senses a sheet jam
to stop conveying sheets on a conveyance path thereby carrying out a jam treatment
in case a jam occurs, comprising:
a standby accommodating portion for discharge which accommodates said sheets being
conveyed on said conveyance path when said sheet jam is sensed by said jam detecting
means; and
a discharge means which discharges said sheets being accommodated in said standby
accommodating portion for discharge outside the apparatus after completion of jam
treatment.
6. A sheet conveying apparatus according to claim 5, wherein said standby accommodating
portion for discharge is an intermediate tray located in a recycling path.
7. An image forming apparatus provided with a sheet conveying apparatus having a jam
detecting means which senses a sheet jam to stop conveying sheets on a conveyance
path thereby carrying out a jam treatment in case a jam occurs, comprising:
a standby accommodating portion for discharge which accommodates said sheets being
conveyed on said conveyance path when said sheet jam is sensed by said jam detecting
means; and
a discharge means which discharges said sheets being accommodated in said standby
accommodating portion for discharge outside the apparatus after completion of jam
treatment.
8. An image forming apparatus according to claim 7, wherein said standby accommodating
portion for discharge is an intermediate tray located in a recycling path.
9. An image forming apparatus according to claim 7, further comprising an image formation
controlling means which carries out said image forming onto said sheets to be accommodated
into said standby accommodating portion for discharge.
10. An image forming apparatus according to claim 9, wherein said image formation
controlling means prohibits the newly image formation which disturbs said image having
been already formed on said sheets in case of discharging thereof.