JPS5841512B2 - Genkou Fukushiya Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to original copying apparatus, and more particularly to an original copying apparatus having an improved failure prevention system.

Due to possible failures such as jamming of copy paper, etc. in duplicating or copying machines, especially high-speed machines, means are usually built in to automatically stop the equipment in the event of a failure. There is.

For example, a jam detector is provided to detect whether copy paper is present or absent at a particular location at a particular time.

An abnormality at this point would indicate a jam and the copying machine would stop.

However, when a malfunction occurs, such as a jam, it is not possible to check whether the problem has already been fixed when trying to restart the machine.

It is possible that such defects cannot be eliminated, especially in large offices where many people use the copying machine.

In addition, this type of machine usually has a fixing device for permanently fixing the reproduced image.

Usually this is equipped with a heater or oven.

Failures such as jams or overheating can also occur within the fuser, and the fuser must be protected from them.

However, it is desirable to minimize operator effort in handling the sometimes very hot fuser, and it is therefore useful to isolate failures in the fuser from failures elsewhere.

It is a principal object of the present invention to provide a new and improved original copying apparatus which eliminates the disadvantages of the machine described above.

To provide an original copying device equipped with a control device capable of suppressing the restart of a copying machine until the trouble is corrected when a trouble such as a jam or overheating occurs in a fixing device of the copying machine. This is another object of the present invention.

It is also an object of the present invention to provide a document copying apparatus with a control system that can distinguish between a jam in the paper feeder and a failure, such as overheating in the fuser.

In order to achieve the above objects, the present invention provides a device for forming a latent image of an image of an original to be copied, a device for developing the latent image, a device for transporting copy paper within a copying device, and a device for transporting copy paper within a copying device. and a device for fusing the image to the copy paper following transfer of the image. In an original copying device configured to be openable so that paper can be removed therefrom, a device for stopping the copying device in response to a jam or an overheating condition in the fixing device; a latch device that is triggered and prevents the reproduction device from restarting;
and a reset device that releases the latch device in response to opening and re-closing of the transport device and the fixing device to restart the copying device. be done.

The configuration and effects of the present invention will become clear from the following description and drawings.

With particular reference to FIGS. 1 and 2 of the drawings, there is shown by way of example a copying or reproducing machine, generally designated by the reference numeral 10, incorporating the automatic program or recovery feature of the present invention. .

As in all electrostatic devices, such as the illustrated electrophotographic type machine, a light image of an original to be reproduced is projected onto the photosensitive surface of an electrophotographic plate to create an electrostatic latent image.

The latent image is then developed with an oppositely charged developer material to form an electrophotographic powder or toner image corresponding to the latent image on the plate surface.

The toner image is then electrostatically transferred to the support surface, where it is fused by a fusing device, permanently adhering the toner image to the support surface.

In the copier 10, an original document 12 to be copied is placed on a transparent platen 14, indicated generally by the reference numeral 15, fixed within an illumination device located at one end of the copier 10.

While on the platen, the document 12 is illuminated, thereby producing an image beam corresponding to the informational surface on the document.

This image beam is projected by an optical device onto the photosensitive surface of the electrophotographic plate.

In the illustrated copier or reproduction machine 10, the electrophotographic plate is in the form of a flexible photoconductive belt 17 supported within a bell 1-assembly 18.

The belt assembly 18 consists of three rollers 20, 21 . arranged on parallel axes approximately at the vertices of a triangle. and 22.

The upper roller 22 is rotatably supported on a shaft 23 which is connected to a suitable motor and drive (not shown).
is rotatably driven to drive the belt 17 in the direction shown by the arrow in FIG.

During this movement of the belt, the reflected optical image of document 12 on platen 14 impinges on the photosensitive surface of belt 17 at exposure location 25, creating an electrostatic latent image thereon.

This electrostatic image is carried on belt 17 from exposure station 25 to development station 26 where the electrostatic latent image is developed with toner using a compound magnetic brush arrangement 29.

The now developed image on the belt 17 is transferred from the development station 26 to a transfer station 30 where the developed image is transferred from the main paper plate 34 or from the auxiliary paper plate 35 as shown, usually The image is transferred to a support surface, which is a sheet of copy paper 31.

Copy paper 31 is passed between transfer roller 32 and bells 1-17 at transfer station 30 at a speed approximately equal to the speed of belt 17 and transferred by electrical bias on transfer roller 32 in a manner understood by those skilled in the art. will be implemented.

Following transfer, belt 17 is moved to cleaning station 3 in preparation for the next image.
It will be cleaned at 6.

There, a suitable cleaning brush 37 housed within the vacuum chamber 38 removes the residual toner and the 1-hener is deposited by the vacuum from the vacuum chamber 38 through a passageway 39 to a suitable collection location (not shown). being sucked out.

A cleaning corotron 40 is provided upstream of the vacuum chamber 38 to aid in cleaning.

Following cleaning of belt 17, belt 17 is once again charged by charging corotron 41 in preparation for the next image.

It will be appreciated that whenever the copier 10 is operated to perform multiple copies, multiple images 42 will be on the belt 17 at the same time in various processing stages, as described above.

Photoconductive belt 17 has a selenium c photoconductive layer on a conductive backing which is the photosensitive surface and the imaging medium for the device.

Further details regarding the construction of this belt assembly and its relationship to the machine and supports are disclosed in related U.S. patent application Ser. No. 102,312, filed December 29, 1970.

Copy paper 31 is supplied from either a main paper plate 34 or an auxiliary paper plate 35.

The main paper plate 34 has a bottom plate 44 of a suitable elevator type, on which a pile 45b3 of copy papers 31 is stacked, and this bottom plate 44 is arranged so that the paper at the top of the pile of copy papers 31 on the elevator 44 is moved by a paper feed roller. It is supported for automatic up-and-down movement by suitable devices (not shown) designed to be in operative contact with 46.

A paper feed roller 46 operates intermittently in the direction indicated by the solid arrow in time to match the interval between the images 42 on the belt 17.
serves to feed the top paper from the stack of copy sheets 45 between a belt 47 and paper feed rollers 48, which in turn convey the paper to a master paper feed conveyor 50.

The conveying device 50 includes one or more endless feed bells 1 51 extending around support rollers 52, one or both of which are driven as appropriate.

The paper guide 54 is arranged in an operative position above the conveyor belt 51 and while the five sheets 31 are moving along the paper supply conveyor 50.
It functions to be placed in tight contact with the belt 51.

Conveying device 50 advances paper 31 to transfer roller 32 .

In the exemplary device shown, an auxiliary tray 35 is placed above the live blood 34, and it has a suitable elevator-type bottom plate 55 through which the supply of paper 31 can take place.

As with the main feed pan 34, a suitable device (not shown) may be used to lift the bottom plate 55 of the auxiliary pan 35 in order to place the paper feed rollers 56 of the auxiliary pan 35 in operative contact with the top paper as the paper supply progresses. ) is provided.

A paper feed roller 56, which is driven intermittently like the main feed roller 46, feeds one sheet of paper at a time between a belt 57 and a paper feed roller 58, which in turn transport the paper to an auxiliary paper feed conveyor. Proceed to device 59.

Support roller 6, one or both of which is driven by 1 as appropriate.
A conveying device 59 having one or more endless belts 60 extending around the auxiliary tray 3
5 is arranged to discharge the paper 31 removed from the feed conveyor 50 onto the working path of the main feed conveyor 50.

The paper 31 coming from the auxiliary tray 35 is then sent to the transfer roller 32.

The guide 63 serves to keep the paper in snug contact with the belt while it travels along the auxiliary paper feed conveyor 59.

Transfer roller 32 is provided with a suitable biasing device designed to attract and adhere paper 31 electrostatically.

In this way, the paper 31 discharged from the main feed conveyor 50
is conveyed by transfer roller 32 across belt 17 to vacuum conveyor 65 in spaced but operative relationship.

It can be seen that the transfer of the image from belt 17 to copy paper 31 occurs as paper 31 passes between transfer roller 32 and belt 17.

Following transfer, copy paper 31 is stripped from belt 17 by suitable means (not shown) and the image-bearing paper is conveyed by vacuum transport 65 to fusing device 69.

The conveying device 65 is provided with a suitable source of vacuum (not shown).
It has a vacuum space 66 supplied from.

The conveying device 65 has an endless conveying belt 67 arranged around rollers 68 and suitably perforated so that the paper 31 fed thereto can be attracted by the vacuum from the vacuum space 66.

The fusing device 69 has a suitable housing 70 containing a lower heated fusing roller 71 and an upper pressure roller 72, the rollers 7L72 together forming an entrance through which the copy sheet 31 passes.

Rollers 71,72 are provided with suitable drives (not shown).
are suitably supported so as to be rotationally driven in unison.

Pressure roller 72 is made of a relatively flexible rubber-like material, so that the contact pressure between rollers 71, 72 deforms the surface of pressure roller 72.

In this way, increased contact between the copy paper and the heated fuser roller 71 is obtained.

In the illustrated exemplary apparatus, fuser roller 71 is hollow and formed of a suitable thermally conductive material.

A heat source, such as an electric light 73, is placed therein.

A suitable temperature change resistor or thermistor 74 is supported on the fuser housing 70 in heat exchange relationship to sense the temperature conditions within the fuser 69.

Appropriate control circuitry (not shown) is provided to control the fuser light 73 in response to the fuser temperature condition sensed by thermistor 74.

The copy paper 31 leaving the fixing device 69 is transferred by an intermediate copy paper output transport device 75 to a copy paper output transport device 76 and from the transport device 76 to a copy paper discharge transport device 78 or to the sorter 1.
00 to any of the inlets of a copy paper handling device.

If the sorter 100 is not in use or if no copy handling device is provided, the blocking gate 79 serves to direct all copies toward the ejection conveyor 78.

A discharge conveyor 78 conveys the copy paper to an exit tray 80.

The copy paper output conveyor 75, 76 and the copy paper discharge conveyor 78 each have one each arranged to be driven around two support rollers 82, one or both of which are driven once. Or it has two or more endless conveyor belts 81.

A guide 83 is placed in operative relationship with each of the transport devices 75, 76, 78 and serves to place the copy paper in operative contact on the associated transport belt.

The guides 54, 63, and 83 are removably supported so that the respective carrier can be opened and viewed in the event of a jam.

A sensor 84 placed in operative relationship with the guides 54, 63, and 83 for the conveying device 50, 59, 75, 76, and 78 indicates that the guide has been removed by the user when a jam occurs. is detected and the copying machine 10 is restarted using the guide 54.
63 and 83 return to their original positions as shown in the figure, and the sensor 84
It is set to Suppression 1 until it is activated.

In the exemplary apparatus illustrated in FIG.
is operatively integrated with copier 10.

The sorter 100 functions to sort copy sheets as they exit the copier 10.

The sorter 100 should be easily movable, preferably on the leg shaft 1.
03 has a suitable frame 102 attached thereto.

The sorter 100 has upper and lower rows 10 of copy paper storage boxes.
5 and 106 are attached respectively.

Each row 105, 106 has a number of regularly spaced bins or pans 108 tilted to one side for receiving and holding sorted copies, each bin having a number of bins or pans 108 for receiving and holding the sorted copies; The top is open to provide an inlet 109.

A generally horizontal copy paper transport device 110, 111 is arranged above each row 105, 106 of the storage box 108 and spaced apart from the population 109.
The operating length of is such that the conveying device 110° 111 can sufficiently transport the copy paper to the extreme end of the storage box.

The conveying devices 110 and 111 are each driven by a suitable device (not shown) on one or both of them.
It has one or more endless conveyor belts 114 supported by rollers 115.

A series of antral rollers 117 are connected to the conveying devices 110, 11
1 and located near the population 109 of each bin 108 in operative contact therewith.
A roller 117 is provided.

Idler roller 117 holds the copy paper in operative contact with transport belt 114 and also serves as a platform for the copy paper to be conveyed by adjacent diverter 120 into the lower storage bin entrance 109.

An individually actuatable diverter 120 is located slightly downstream of each roller 117.

When driven to the raised position, diverter 120 cooperates with the surfaces of rollers 117 to divert the copy paper from the associated paper transport device 110 or 111 to storage bin 108 below.

The sorter 100 has a copy sheet stack 122 formed by a pair of paper guide plates 123, and the height of the sorter plate 122 is approximately equal to the operating height of the copy paper discharging and conveying device 76.

The copy sheets from the discharge conveyor 76 thus pass into the sorter 100 where they are sorted.

It can be seen that in such operation, the gate 79 of the copier 10 is in the down position.

A pair of sorted amount supply rollers 125 are provided adjacent to the discharge side of the inlet guide 123.

A pair of rollers 125 driven in the direction indicated by solid arrows in the drawing serve to feed copy sheets into the sorter 100.

A movable selector inlet diverter 130 is provided immediately downstream of the pair of rollers 120, and when in the solid line position shown in the drawing, the diverter 130 directs the copy paper to the conveying device 111 and the lower row of storage bins 106. It works to direct towards.

The copy paper 31 is transferred to the transport device 110 and the upper row of storage boxes 105.
An elevating conveyance device 132 is provided so as to be able to supply the same.

The conveying device 132 has one or more endless belts 133 supported by a pair of rollers 134, one or both of which are driven by a suitable device (not shown).

A series of idler rollers 135 transport the copy paper to the conveyor 13.
2 and is arranged so as to come into contact with the operation of the conveyor belt 133.

A lifting conveyor 132 is positioned in operative relationship with a diverter 130 immediately downstream of the pair of rollers 125 where the diverter 13
0 functions to send the copy paper 31 coming out of the pair of rollers 125 to the conveying device 132 when moved to the dotted line position shown in the drawing.

A pair of curved paper guides 138 are operatively disposed between the -L discharge end of the conveyor 132 and the partial conveyor 110.

A pair of guides 138 serve to redirect copy sheets leaving transport 132 through an approximately 90 degree arc to transport 110 above.

During use, copy paper 31 leaving the copying machine 10 is passed through a sorter 100.
1122 and is advanced by the pair of rollers 125 to either the lower conveying device 111 or the ascending conveying device 132 depending on the position of the diverter 130.

The copy paper present in the transport device 1321 is thereby lifted towards the seventh transport device 110.

Copy paper 3 in either transport device 110 or 111
1 is placed into a selected storage box 108 in either the upper or lower storage box row 105, 106 by driving the five selected converters 120, respectively.

In the exemplary arrangement shown, generally numbered 150
An automatic document handler is provided, shown in FIG. 3 and best seen in FIG.

As can be seen, the document handler 150 functions to transport one document at a time from a source 151 to a copying position on the platen 14 of the copier 10 where one or a series of copies are made.

Following copying, each document is automatically returned to document source 151 and the next document, if any, is brought to the copy position on platen 14.

As shown, upon completion of the copy program.

Documents returned to source 151 are recycled by handler 150 or simply removed by the user.

The document handler 150 includes a tilted base plate 153 whose lower end is rotatably supported by a shaft 154, and a plate member 155 that can be adjusted from side to side.

[■ is approximately U-shaped when viewed in cross section, and each has a bottom 157, a lid 158 spaced apart above the bottom 157, and a side plate 159.

A portion of the bottom 157 of each tray is a primary document supply roller 160.
It is notched at its upper end to accommodate the.

The book member 155 has a shaft 154 for accommodating originals of various sizes.
can be adjusted accordingly.

The document supply roller 160 is connected to the drive shaft 16 under the substrate section 153.
1 , where a roller 160 is rotatably supported.
A part of the same side of is protruding from the surface of the document plate.

A suitable window is made in the base plate portion 153 to accommodate the roller 160.

The supply roller drive shaft 161 is suitably supported for rotation;
It is then driven once in the direction indicated by the solid arrow in FIG. 3 by a suitable device (not shown).

The pair of document restriction rollers 163 and 164 are the supply roller 1
60, and functions so that only one document passes through at a time.

The shaft 165 of the lower limit roller 164 is rotated in the direction indicated by the solid arrow in FIG.

The seven limit rollers 163 supported by the shaft 166 are 60
-The friction created between the rubber parts 163° and 164 is larger than a specified value.
As long as it is L, it is adjusted to be driven by the lower control roller 164.

In the case of a reduction in roller friction, which occurs when two documents overlap and are about to pass, the lower roller 163 is driven by a suitable drive device (not shown) to move the document as indicated by the dotted arrow in FIG. Rotated in the direction of rejection.

The documents exiting the restriction rollers 163, 164 are advanced to the platen transport device 171 by intermediate transport rollers 168, 169 below the curved document guide 170.

A conveyance device 171 including a belt-type conveyor carries the original to the copying machine 1.
0 onto the platen 14.

A register edge 172 is provided on the population side of the platen 14,
It serves as a register or positioner at a predetermined position on the platen 14-1 for copying a document.

For this purpose, platen transport 171 is reversed after the document has completely passed register edge 172.

Reversing the transporter 171 moves the document back so that the trailing edge of the document contacts the l/jister edge 172.

When copying is complete, platen transport 171 is again actuated in the reverse direction to move the document back and off platen 14.

The register edge 172 is retracted by a suitable device (not shown) for this purpose.

The document guide 170 deflects or guides the returning document upwardly into a pair of first return transport rollers 174, which guide the returning document between the appropriate return guides 176. carry and place the original on the plate member 155.1
56 to a pair of second return conveying rollers 178 .

The return document (conveniently labeled with L number 151) is kept separated from the document source 151 waiting to be fed and transferred by the primary supply roll 160 after feeding the last sheet of the first document source 151. To prevent the return document 151 from being re-fed, a removable crossbar or partition bar 180 is provided approximately in front of the feed roller 160 in the -L direction.

The crosspiece 180 is supported by a swingable transverse @t+181.

The shaft 181 is suitably pivoted within the support frame structure of the document handler 150, and the base portion 153 of the handler 150 is suitably drilled to permit the placement of the crosspiece support arm 182 therethrough.

A suitable device (not shown) for selectively rotating horizontal shaft 181 and lifting crosspiece 180 resting thereon from beneath document 151 and then returning crosspiece 180 to the top of the pile of documents. ) is provided.

In addition to preventing the manuscript from falling out of the tray, especially the crossbar 1
A plate cover 183 is provided to help guide the document back into the document mold when the document 80 is lifted.

Cover 183 is supported on shaft 154 so that cover 183 can be opened to access document tray member 155 when loading and unloading documents.

Referring to the control circuit diagram in FIG.
is located in a secure location along the copy paper path within the copier 10, i.e. at the location of the selector 100, and is responsive to a jam or blockage of the copy paper path in conjunction with appropriate operating circuitry. do the work.

To sense a failure such as overheating within the fuser 69, a fuser overheat detector 260 is provided to protect the device from overheating within the fuser 69.

The output signal of detector 220 is provided to transport failure detection circuit 207, while the output signal from fuser detector 260 is provided to fuser failure detection circuit 208.

When detector 220 detects a jam and triggers circuit 207, or alternatively when detector 260 detects a fuser overheat condition and triggers circuit 208, circuit 207 or 208 activates Stop 8 circuit 210 to stop copying. Stop the operation.

At the same time, signals from circuits 207 and 208 trigger print blockage circuit 222, which inhibits restart of copier 10.

When the transport failure detection circuit 207 is triggered, a signal therefrom sets the gold circuit 226 for transport.

If the failure is within the fuser 69, the trigger of the fuser failure detection circuit 208 sets both the fuser lock circuit 228 and the transport circuit 226.

When triggered, the signal output of the latch circuits 226, 228 provides a hold signal to the stop circuit 210 and the print blockage circuit 222 to prevent them from being reset to a no-fault condition until the fault is corrected.

The transport is provided with a transport reset circuit 2306i to reset the gold circuit 226, which is connected to the transport detector 84.
Triggered by a human signal from.

In the event of a jam on the transport path, restart of copier 10 is inhibited until paper transports 50, 59, 75, 76, and 78 are at least opened and closed and sensed by transport detector 84. ing.

During the process of opening and opening several paper carriers, the operator will likely remove the jammed object.

A fuser reset circuit 232 is provided to reset the fuser lock circuit 228 so that the copier 10 can be restarted after a failure such as overheating within the fuser.

A detector 233 is provided on the housing 70 of the fixing device, and the detector 233 detects opening and closing of the housing of the fixing device.
It functions to trigger.

The generated signal from detector 233 to reset circuit 232 triggers circuit 232, and the signal therefrom resets fuser lock circuit 228 so that copier 10 can be restarted.

A trap solenoid 235 for the fuser inlet conveyor 65 is used to prevent copy sheets upstream of the fuser 69 from entering a malfunctioning fuser and from becoming jammed therein when the copier 10 is stopped. is provided.

The solenoid 235 is supported in an operating position opposite the operating passageway below the transport device 65 and includes an armature 236 which, when the solenoid is energized, moves the transport frame 66 between the moving transport belts 67. It is arranged to move into physical contact with a portion so that all copy sheets on the transport device 65 are stopped at that point.

As will be seen later, subsequent copies upstream of transporter 65 are stopped by jam solenoid 235.

The discharge diverter 79 has a suitable solenoid operator 238 adapted to rotate the diverter 79 to the dotted position shown in FIG. 1 when actuated.

In this position, the copy paper is directed into the sorter 100 population.

Simultaneously with the deenergization of solenoid 238, a suitable biasing device (
output conveyor 83 (not shown) rotates converter 79 to the solid position, where the copy sheet is transferred to tray 80.
carried upwards.

When the carrier latch circuit 226 is activated, a signal from that circuit activates the activation circuit for the solenoids 235 and 238 to prevent the -L flow of copy paper from entering the fuser 69. Solenoid 238 was deenergized at the same time.
then sends the copy sheet being processed to paper [T1180.

If a jam occurs in any one of the paper transport devices, the signal from the affected detector 220 is transferred to the circuit 20.
7, and it sequentially triggers the metal circuit 2.
26, and on the other hand, the copying machine stop circuit 210 and the mark-11 block circuit 222 are respectively activated.

Confirmation signals from the transport hook circuit 226 sequentially activate the jam solenoid 235 so that the copy paper being processed is transferred to the fixing device 6.
9 and on the other hand diverter solenoid 23.
8 from working, and then place the copy paper being processed on plate 80.
send to

In order to restart the copy paper 10, the paper transport device 50,5
Each of 9, 75, 76, and 78 must be opened and closed again to activate their associated detectors 84.

Following this, the combined signal power of detector 84 triggers conveyance reset circuit 230, which in turn resets latch circuit 226.

The signal from circuit 226 resets print blockage circuit 222 so that copier 10 can be restarted.

In the event of a fuser 69 failure, the detector 260 triggers the fuser failure circuit 208, which in turn activates the copier stop circuit 210 to shut down the copier 10 and restart the copier 10. In order to prevent this, the print blocking circuit 222 is activated.

At the same time, a signal from circuit 208 is sent to gold circuit 2 for the fuser.
28 and the carrying hook energize both metal circuits 226.

As previously described, circuit 226, when actuated, sets diverter 79 in the dished position while blocking jam solenoid 23.
Activate 5.

In order to restart after the fuser fault detection circuit 208 is activated, the fuser 69 must be opened and the fault fixed; in the case of a paper jam, this removes the paper stuck in it. It is necessary.

Fuser housing 70 is then closed again.

Closure of the fuser housing 70 triggers the fuser reset circuit 232 which resets the fuser gold circuit 228 and releases the stamp blockage circuit 222.

Since the carrier latch had the metal circuit 226 also 1-rigged, some paper carriers had the carrier reset circuit 230 1-rigged.
It must be opened and closed again to trigger, which in turn triggers the carrier circuit 226 to restart the copier 10.

As will be appreciated, if the fault is an overheating condition within the fuser, the detector 260 is operative to shut down the copier 10.

In this case, the fuser 69 is opened and the failure occurs in the copier 10.
I have to fix it so I can restart it.

If the fuser device 69 has a pressure relief mechanism of the type described in Oskar Braun and related U.S. patent application Ser. The signal from the device failure circuit 208 is further transmitted to the fuser rollers 71, 72.
Activating the mechanism to release the pressure between the fixing device 6
9 is deactivated.

In this case, reset of the fuser is inhibited until the fault is corrected and the gold circuit 228 for the fuser is reset.

Other conditions or failures can be imagined that would trigger the fuser failure circuit 208 and thus activate both the fuser and transport hook circuits 228 and 226, respectively.

For example, a failure to open the processor lock or release the copy paper from the photoconductive belt 17 after image transfer is considered a fuser jam and triggers the fuser failure circuit 208 as described above. can be used for.

As described above, in the original copying apparatus according to the present invention, the copying apparatus stops in response to not only a jam but also an overheating state in the fixing device. The device is configured so that it cannot be restarted until the cause of the jam or overheating inside the fixing device is removed and the transport device and fixing device are closed again. This means that the cause of the failure cannot be removed or the operator may be careless. This has the remarkable effect of preventing restarts.

Although the invention has been described with reference to the illustrated structure, it is intended that the invention not be limited to what has been described in detail, but that it will cover modifications and variations within the scope of the appended claims.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of an electrostatic copying machine using the improved control device of the present invention, Fig. 2 is a top view of the Hirakata machine shown in Fig. 1, and Fig. 3 is the same as Fig. 1. FIG. 2 is an enlarged sectional view of the automatic document handler for the copying machine shown in FIG. FIG. 4 is a schematic circuit diagram of the improved control device of the present invention. 10.091.・Copy machine, 50...Transportation device,
69...Fixing device, 207...Transportation detection device, 208...Fixing device failure detection device, 2
10...stop device, 222...mark m!
J-blocking circuit, 232...Transportation reset device, 2
32... Fixing device reset device, 260...
・−・Fuser overheat detector.

Claims (1)

[Claims] 1. A device for forming a latent image of the image of the original to be copied, a device for developing the latent image, a device for transporting copy paper within the copying device, a device for transferring the developed image onto the copy paper, a device for fusing the image to the copy paper following transfer of the image, said conveying device and said fixing device being releasable so that the copy paper can be removed therefrom in the event of a copy paper jam or overheating condition. A device for stopping the copying device in response to a jam that occurs or an overheating state in the fixing device, and a latch device for preventing restart of the copying device triggered by the stopping device. and a reset device that releases the latch device in response to opening and re-closing of the transport device and the fixing device to restart the copying device. .