JP3756083B2 - Image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus that performs an image forming process by supplying a long sheet that is longer than a standard sheet cut to a predetermined size.
[0002]
[Prior art]
Conventionally, fixed-size paper, small-sized postcards, envelopes, and the like have been mainly used for image forming apparatuses such as copying machines and printers. Recently, long-sized paper has been used in home copying machines and the like. There are many more.
[0003]
By the way, a general image forming apparatus is designed such that the width dimension of the paper supply path is determined according to the maximum width paper to be used. That is, the width dimension of the supply path is wider than the maximum width of the sheet so that troubles such as JAM (paper jam) do not occur even when the maximum width of the sheet is supplied. For example, for a standard paper, it is sufficient that it is about 30 to 40 mm wide (15 to 20 mm on one side with respect to the center of the width) in consideration of the compactness of the apparatus.
[0004]
[Problems to be solved by the invention]
However, the situation is different when long paper is used. This state will be described below with reference to FIG. FIG. 7 shows a state in which long paper is supplied obliquely with respect to the supply path (hereinafter, sometimes referred to as “skew”). Reference numeral 110 denotes a typical conveyance roller that is provided on the supply path 120 and controls conveyance of the long paper 115, and includes a cylindrical roller pad 111 and shaft portions 112 and 112 at both ends thereof. The conveying roller 110 is rotatably attached to an apparatus main body (not shown) via a pair of bearings 113 and 113 provided on the shaft portions 112 and 112. Reference numeral 114 denotes a gear for rotating the transport roller 110, which is fixed to one shaft portion 112 and connected to a drive mechanism (not shown). Although not shown, a support member that supports the transport roller 110 and a member that protrudes toward the supply path 120 exist outside the supply path 120. For example, when a cutter (not shown) that cuts the long paper 115 in the width direction across the supply path 120 is provided, the supply is performed near the downstream side of the cutter with respect to the supply direction F of the long paper 115. There is often a member that protrudes toward the path 120.
[0005]
Now, the width W of the supply path 120 is set to be substantially equal to the width of the roller pad 111, and the long paper 115 is supplied obliquely. Since the long paper 115 is long in the supply direction F, once the supply of the long paper 115 proceeds obliquely, the degree of exceeding the width W region of the supply path 120 increases toward the rear end. Go. Then, the side edge portion of the long paper 115 beyond the area of the width W of the supply path 120 is engaged with the bearing 113 and the gear 114, or the support member that supports the transport roller 110 and the supply path 120. Troubles may occur due to interference with the protruding members.
[0006]
In this way, in the case of long paper, even if it is a slight skew that does not cause trouble with regular paper, the paper is caught in parts such as bearings and gears that are located beyond the width of the supply path. It is easy to cause troubles such as In addition, since it is difficult to remove the paper caught in the bearings and gears, the paper is often torn when removing the paper, and if the torn paper remains inside the device, the device again May cause trouble or damage when the is operated. In order to prevent such a problem, it can be easily considered that the width of the supply path is made wider. However, this leads to an increase in the size of the apparatus, and for a member that protrudes toward the supply path. Is not a good idea because it gets worse.
[0007]
Therefore, the present invention has been made in view of the above-described problem, and prevents a problem that a long sheet of paper is caught in or interferes with a component disposed at a position exceeding the width of the supply path. It is an object of the present invention to provide an image forming apparatus capable of performing the above.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, an image forming apparatus according to the present invention is an image forming apparatus that performs image forming processing by supplying a long paper longer than a standard paper.A feeding means for sending a long sheet toward the image forming unit where the image forming process is performed is provided in the supply path of the long sheet, on the upstream side of the sending means.A sensor that reacts to the side edge of the long paper that exceeds the area defined in the width direction of the supply path on both sides of the supply path, and the side edge portion of the long paper that exceeds the area along the supply path. A first cutter for cutting is provided in this order from the upstream side with respect to the supply path, and a second cutter that can move in the width direction of the supply path and cuts long paper in the moving direction is provided upstream of the sensor. Provided inA guide plate is provided in the vicinity of the first cutter, and a through-hole is provided from the end of the guide plate to the outside of the apparatus main body.When the sensor reacts, the long paper is continuously supplied for a predetermined length, and then the long paper is cut by the second cutter, and the long paper is supplied upstream of the second cutter. Is provided with control means for controlling so as to stop.Then, the long sheet in the area on the downstream side cut by the first and second cutters is conveyed to the downstream side of the supply path and discharged to the outside of the apparatus, and the first and second cutters The side edge portion of the long sheet on the downstream side cut by the above is discharged out of the apparatus main body from the through-hole while being guided out of the supply path by the guide plate.
[0009]
  Also,A roller is provided on the guide plate so that the side edge portion of the long sheet cut by the first and second cutters is reliably discharged from the through hole to the outside of the apparatus main body, and the roller is cut. The side edge portion of the long sheet is sent out toward the through hole.It is like that.
[0010]
Further, the second cutter cuts the long sheet in the downstream area cut by the second cutter so as to be surely conveyed to the downstream side of the supply path and discharged to the outside of the apparatus. The predetermined length of the long paper in the control means may be set so that the cut long paper in the downstream area has a length that can be conveyed at least downstream of the supply path. preferable.
[0011]
  AndThe sensor is a PI sensorGood.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 and 2 are external perspective views of an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a main part of the image forming apparatus according to the present embodiment. FIG. FIG. 5 is a diagram showing details of the vicinity of the paper feed unit, and FIG. 6 is a diagram of FIG. 5 viewed from the right side.
[0013]
This image forming apparatus is a copying machine. In FIGS. 1 and 2, reference numeral 1 denotes an image forming apparatus main body having a contact glass 2 on which a copy document is placed. Reference numeral 3 denotes an automatic document feeder (ADF), the rear end of which is pivotally attached to the image forming apparatus main body 1 via hinge mechanisms 4 and 4 and separated from the contact glass 2 as shown in FIG. It can be stationary in the state. The automatic document conveying device 3 includes a conveying unit 90, 91 is a document placing table on which a copied document is placed, and 92 is a guide for regulating the copied document in a direction orthogonal to the conveying direction. An ADF contact glass 93 is provided on the side of the contact glass 2. A slit 94 is provided at a position corresponding to the ADF contact glass 93 on the bottom surface of the automatic document feeder 3. The document is read by an exposure optical system (not shown) when the document passes through the slit 94. It has become. A document mat 95 is provided on the side of the slit 94 at a position corresponding to the contact glass 2. Reference numeral 5 denotes an operation panel for inputting copy information and the like.
[0014]
Reference numeral 6 denotes a front cover, the lower end side of which is rotatably attached to the image forming apparatus main body 1 via hinge mechanisms 7 and 7 and is held in a state of projecting substantially horizontally toward the front when opened to the front side. It is like that. Reference numeral 8 denotes a toner cartridge, and 9 denotes a toner recovery tank.
[0015]
Below the front cover 6, two upper and lower sheet feeding cassettes 10 and 11 are provided. These are for automatically feeding a fixed-size sheet cut to a predetermined size, and are attached to the image forming apparatus main body 1 so as to be freely accessible in the front-rear direction. In addition, a copy storage unit 13 is provided above the front cover 6 for storing a copy discharged from the discharge unit 12.
[0016]
Reference numeral 14 denotes a manual paper feed unit having a manual tray 15. The manual feed tray 15 is rotatably attached to the image forming apparatus main body 1 via a support shaft (not shown) at the base end, and protrudes substantially horizontally toward the side as shown in FIG. Thus, it is possible to take a state in which the image forming apparatus main body 1 is in close contact with the side surface of the image forming apparatus main body 1.
[0017]
The long paper 17 is supplied to the paper feed opening 25 via the manual feed tray 15. The long paper 17 may be cut to an appropriate length or may be wound in a roll shape in the length direction. When the long paper 17 is attached, a sensor 23 (not shown) for detecting the attachment is provided, and this sensor 23 is connected to a control circuit (not shown) of the image forming apparatus main body 1.
[0018]
The description will be continued based on FIG. A paper feed roller 26 is provided at the paper feed port 25 of the manual paper feed unit 14, and a lift plate 27 and a separating mechanism 28 are provided below the paper feed roller 26. The lift plate 27 is rotated about a left end portion of the drawing by a driving mechanism (not shown) so as to be in contact with and away from the outer peripheral portion of the sheet feeding roller 26. The separating mechanism 28 includes a friction pad 29, a solenoid 30, and a link 31 for connecting them.
[0019]
The friction pad 29 is formed of a material having a high coefficient of friction, and one end of the friction pad 29 is rotatably attached to the image forming apparatus main body 1 via a support shaft 32 so as to be in contact with and away from the outer peripheral portion of the paper feed roller 26. It has become. The friction pad 29 is urged in a direction in contact with the sheet feeding roller 26 via a spring (not shown).
[0020]
A support portion 33 is provided at the other end of the friction pad 29, and one end of the link 31 is rotatably attached to the support portion 33 via a pin 34. The solenoid 30 is fixed to the image forming apparatus main body 1 with the movable iron core 30a facing upward, and the other end of the link 31 is rotatably attached to the movable iron core 30a via a pin 35. When the solenoid 30 is energized, the movable iron core 30 a is drawn, and the link 31 rotates the friction pad 29 in a direction away from the paper feed roller 26.
[0021]
Above the friction pad 29, a cutter 50 (hereinafter sometimes referred to as “second cutter”) that cuts the long paper 17 is provided. The cutter 50 is configured such that a moving body that supports a disk-shaped blade so as to be rotatable about a center point runs in the width direction of the long paper 17 and cuts the long paper 17 in the same direction. Registration rollers 36 and 37 are provided above the cutter 50 and are opposed to each other so as to sandwich the sheet conveyance path. The rollers 36 are driven to rotate by a driving mechanism (not shown). Below these, a registration switch 38 for detecting the passage of the paper is provided, and the control circuit drives the registration roller 36 in accordance with a signal supplied from the registration switch 38.
[0022]
Here, in this embodiment, as shown in FIGS. 5 and 6, diagonal lines such as a PI sensor that detects skew of the long paper 17 are provided on both sides of the supply path 80 of the long paper 17 above the cutter 50. A pair of row detection sensors 81 and 82 are provided. Now, when the width W of the supply path 80 is set substantially equal to the width of the registration rollers 36 and 37 and the side edge of the long paper 17 exceeds the width W of the supply path 80 and is supplied in the supply direction F, the skew feeding is performed. The detection sensors 81 and 82 react to the side edges of the long paper 17 so that the skew of the long paper 17 is detected. The skew detection sensors 81 and 82 may be reed switches or micro switches.
[0023]
Above the skew detection sensors 81, 82, a pair of vertical cutters (hereinafter referred to as “first cutters”) that cut the long paper 17 along the supply direction F on both sides of the supply path 80 of the long paper 17. 91 and 91, which may be referred to as “cutters”, are provided across the width W of the supply path 80. The vertical cutter 91 includes a disk-shaped blade 91a and a central shaft 91b of the blade 91a. The central shaft 91b is rotatably supported by the image forming apparatus main body 1 through a bearing portion (not shown). Accordingly, when the side edge of the long paper 17 is supplied in the supply direction F beyond the width W of the supply path 80, that is, when the side edge portion of the long paper 17 passes over the vertical cutter 91, the vertical cutter. The blade 91a of 91 cuts the side edge portion of the long paper 17 while rotating. Then, the long paper 17 is separated into an appropriate portion 17a and an unnecessary portion 17b supplied to the registration rollers 36 and 37.
[0024]
In the vicinity of the vertical cutters 91, 91, guide plates 92, 92 and discharge rollers 93, 93 are provided to guide the unnecessary portion 17 b of the long paper 17 out of the supply path 80. The guide plate 92 is composed of two opposing guide plates 92 a and 92 b, with one end directed on the supply path 80 and the other end connected to an opening 94 provided in the image forming apparatus main body 1. The discharge roller 93 includes a cylindrical roller 93a in which a part of the peripheral surface is exposed in a gap between the two guide plates 92a and 92b, and a central shaft 93b of the roller 93a. The image forming apparatus main body 1 is rotatably supported via a bearing (not shown) and is connected to a driving mechanism (not shown). Accordingly, the unnecessary portion 17 b of the long paper 17 is promoted by the rotation of the discharge roller 93, passes through the gap between the two guide plates 92 a and 92 b, and is sent out from the opening 94 to the outside of the image forming apparatus main body 1.
[0025]
Note that the skew detection sensors 81 and 82 and the vertical cutters 91 and 91 are provided in this order from the upstream side of the registration rollers 36 and 37 with respect to the supply direction F of the long paper 17 as described above. Even if the skew of the long paper 17 occurs, before the side edge portion of the long paper 17 exceeding the width W of the supply path 80 is engaged with the bearings and gears that are usually provided at both ends of the registration rollers 36 and 37. This is to detect the skew and to cut the side edge portion.
[0026]
Although not shown in FIGS. 5 and 6, a support member that supports the registration rollers 36 and 37 and a member that protrudes toward the supply path 80 exist outside the supply path 80. For example, the cutter 50 that cuts the long sheet 17 in the width direction across the supply path 80 is provided above the vicinity of the paper feed roller 26, and toward the supply path 80 above the vicinity of the cutter 50. There is a protruding member.
[0027]
Returning to FIG. 3, the description will be continued. An image forming unit 39 is provided above the registration rollers 36 and 37. The image forming unit 39 includes a photosensitive drum 40 on which a toner image is formed, and a cleaning unit 41, a charger 42, a developing unit 43, a transfer roller 44, and the like disposed around the photosensitive drum 40 along the rotation direction. is doing.
[0028]
A fixing unit 45 is provided above the image forming unit 39. The fixing unit 45 has a pair of rollers 46 and 47 arranged to face each other so as to sandwich the sheet conveyance path. The sheet is sandwiched between the rollers 46 and 47 so as to be heated and transferred onto the sheet. The toner image is melted and fixed on the paper.
[0029]
Above the fixing unit 45, the discharge unit 12 is provided. The discharge unit 12 has a pair of discharge rollers 48 and 49 arranged to face each other so as to sandwich the sheet conveyance path, and the copy storage unit is configured such that the sheet that has passed through the fixing unit 45 is sandwiched between the discharge rollers 48 and 49. 13 is discharged.
[0030]
Further, in the present embodiment, when the long paper 17 is attached, when the sensor 23 (not shown) detects the attachment, it automatically shifts to the long paper mode suitable for the image forming process for the long paper. It has become. Specifically, the contents of the long paper mode are as follows: (1) JAM detection using the registration switch 38 is not performed or the detection time is extended, (2) The image memory is not divided, and (3) the separation mechanism 28 consists of three elements that do not work. These will be described in detail below.
[0031]
First, (1) will be described. The registration switch 38 is turned on when the leading edge of the sheet conveyance direction reaches the registration switch 38, and the registration switch 38 is turned off when the trailing edge of the sheet conveyance direction passes the registration switch 38. The time from ON to OFF is determined by the paper size, and when this time exceeds a predetermined time, the control circuit determines that double feeding has occurred and stops the operation. This process is possible when the standard paper is continuously conveyed, because a gap is generated between the papers. However, since the long paper is continuous, the registration switch 38 remains ON unless cut. Thus, if it is determined with the same length of time as in the case of the standard paper, a malfunction occurs. Therefore, in the long paper mode, such processing is not performed or the detection time is lengthened to prevent malfunction.
[0032]
Next, (2) will be described. When image formation is performed on a standard sheet, the CPU of the control circuit temporarily expands the data read from the scanner in the bitmap memory. In this bitmap memory, the original data is expanded and secured for each page. However, in the long paper mode, the CPU eliminates the area separation for each page and makes the entire memory as one area. I try to secure it.
[0033]
Next, (3) will be described. The separating mechanism 28 presses the overlapped sheet between the sheet feeding roller 26 with the friction pad 29 and prevents the sheet in contact with the friction pad 29 from being conveyed by the action of the friction pad 29 having a high friction coefficient. The two overlapping sheets are separated. In the case of a long paper, double feeding does not occur, so that the friction pad 29 is separated from the paper supply roller 26 in the long paper mode.
[0034]
Even when the long paper 17 is attached, if the user selects the paper cassettes 10 and 11 on the operation panel 5, the paper feeding cassettes 10 and 11 are not shifted to the long paper mode. The paper is fed from. That is, as shown in FIG. 4, when the long paper 17 is attached (step # 10) and the sensor 23 is turned on (step # 20), the CPU selects and inputs the paper cassettes 10 and 11 on the operation panel 5. Is read (step # 30).
[0035]
If the paper cassettes 10 and 11 are selected, the CPU selects a cassette paper feed processing procedure (step # 40) and starts copying (step # 70). If the paper cassettes 10 and 11 are not selected in step # 30, the CPU selects the manual paper feed processing procedure (step # 50), and then shifts to the long paper mode described above (step #). 60) Copying is started (step # 70).
[0036]
When the copy operation is started and the skew detection sensors 81 and 82 do not detect the skew of the long paper 17 in step # 71, the long paper 17 is kept in a predetermined state while the copy operation proceeds as it is. When the length is conveyed, it is cut in the width direction by the cutter 50, and the copying is completed (step # 80).
[0037]
On the other hand, when the skew detection sensors 81 and 82 detect the skew of the long paper 17 in step # 71, the CPU has a length that allows the proceeding long paper 17 to be conveyed to the copy storage unit 13. It is determined whether or not there is (step # 72). That is, it is determined whether or not the length is equal to or longer than the shortest arrangement interval among the arrangement intervals of the registration rollers 36 and 37 and the rollers 46 and 47 that are arranged in the conveyance path and manage the conveyance of the long paper 17. This determination is made, for example, based on the elapsed time from when the registration switch 38 that reacts to the leading end of the long sheet 17 in the conveyance direction is turned on until the skew detection sensors 81 and 82 react.
[0038]
If it is determined in step # 72 that the length can be conveyed, the long paper 17 is immediately cut in the width direction by the cutter 50 (step # 74), and the supply of the long paper 17 is stopped (step # 75). ). Next, the cut and copied paper is transported to the copy storage unit 13 (step # 76), and after the transport is completed (step # 77), the operation of the apparatus (copying operation) is stopped to operate. JAM display is performed on the panel 5 (step # 78). If it is determined in step # 72 that the length is not transportable, the supply of the long paper 17 is continued so that the length is once transportable (step # 73), and the process proceeds to step # 74. The above-described flow is performed. Thereafter, reset is performed (step # 79), and the process returns to step # 10 and the copy operation is performed again. Then, this flow ends.
[0039]
Next, a case where copying is actually performed will be described. First, the long paper 17 is attached, and the leading end of the long paper 17 is inserted into the paper feed port 25 via the manual feed tray 15. When a long copy document is set on the document placement table 91 and the print button on the operation panel 5 is pressed, the copy document is sent in the length direction and the exposure optics placed below the ADF contact glass 93. The image of the original is read by the system. Further, the lift plate 27 rotates upward to press the long paper 17 against the paper supply roller 26 and the paper supply roller 26 rotates to pull the leading end of the long paper 17 into the image forming apparatus main body 1. At this time, the friction pad 29 is separated from the paper supply roller 26.
[0040]
The leading edge of the long sheet 17 rises in the conveyance path, passes through the registration switch 38, hits the registration rollers 36 and 37, and stops. In the image forming unit 39, the surface of the photosensitive drum 40 is charged by the charger 42, the photosensitive drum 40 rotates, and the reflected light of the image of the copy original read by the exposure optical system is reflected on the photosensitive drum 40. The electrostatic latent image of this image is formed on the surface of the photosensitive drum 40. Then, the developing unit 43 develops the electrostatic latent image by attaching toner to the surface of the photosensitive drum 40.
[0041]
When the long paper 17 is stopped and a predetermined time elapses, the registration rollers 36 and 37 are rotated to raise the long paper 17 again. Then, the toner image on the surface of the photosensitive drum 40 is transferred onto the long paper 17 when passing between the photosensitive drum 40 and the transfer roller 44. Then, the long paper 17 reaches the fixing unit 45 and is pressurized and heated between the rollers 46 and 47, whereby the toner image is melted and fixed on the long paper 17. Then, the long sheet 17 on which the image is formed reaches the discharge unit 12 and is discharged to the copy storage unit 13 by the discharge rollers 48 and 49.
[0042]
The long paper 17 is cut in the width direction by the cutter 50 when it is conveyed by a predetermined length. When a new copy document is set on the document table 91 and the print button is pressed, the above-described operation is repeated to perform the next copy.
[0043]
On the other hand, when the skew detection sensors 81 and 82 detect the skew of the long paper 17 during the copying operation, the long paper 17 is subjected to the width direction by the cutter 50 after the predetermined determination and processing described above are performed. And the supply is stopped. The paper that has been cut and copied is conveyed to the copy storage unit 13, and after the conveyance is completed, the driving of the apparatus (copying operation) is stopped and a JAM display is made on the operation panel 5. . At this time, since the paper that has been cut and copied is discharged to the outside of the image forming apparatus main body 1, there is no special work for the user to remove the paper, and the long paper 17 is set again. Thus, the above-described operation is repeated and copying is performed again.
[0044]
On the other hand, the side edge portion (unnecessary portion 17b) of the long paper 17 that is skewed and exceeds the width W of the supply path 80 is cut by the vertical cutter 91 and the cutter 50, although it does not particularly disturb the copying operation. The paper is discharged from the opening 94 to the outside of the image forming apparatus main body 1 by the guide plate 92 and the discharge roller 93.
[0045]
In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation can be given to embodiment mentioned above in the range which does not deviate from the summary of this invention. For example, as long as the sensor 81 for detecting the skew of the long paper and the vertical cutter for cutting the side edge portion of the long paper are provided in this order from the upstream side with respect to the supply path, any location on the supply path The same effect can be obtained even when the user inputs ON on the operation panel 5 instead of the automatic operation of detecting the attachment of the long sheet by the sensor 23 and turning ON.
[0046]
【The invention's effect】
  As described above, according to the present invention, in an image forming apparatus that performs image forming processing by supplying a long paper longer than a standard paper,A feeding means for sending a long sheet toward the image forming unit where the image forming process is performed is provided in the supply path of the long sheet, on the upstream side of the sending means.A sensor that reacts to the side edge of the long paper that exceeds the area defined in the width direction of the supply path on both sides of the supply path, and the side edge portion of the long paper that exceeds the area along the supply path. A first cutter for cutting is provided in this order from the upstream side with respect to the supply path, and a second cutter that can move in the width direction of the supply path and cuts long paper in the moving direction is provided upstream of the sensor. Provided inA guide plate is provided in the vicinity of the first cutter, and a through-hole is provided from the end of the guide plate to the outside of the apparatus main body.When the sensor reacts, the long paper is continuously supplied for a predetermined length, and then the long paper is cut by the second cutter, and the long paper is supplied upstream of the second cutter. Is equipped with a control means for controlling so as to stop. Then, the long sheet in the area on the downstream side cut by the first and second cutters is conveyed to the downstream side of the supply path and discharged to the outside of the apparatus, and the first and second cutters The side edge portion of the long sheet on the downstream side cut by the above is discharged out of the apparatus main body from the through-hole while being guided out of the supply path by the guide plate. ThereforeThus, it is possible to prevent a trouble that a long sheet bites into or interferes with a component arranged at a position beyond the region. Moreover,First,The long sheet in the area on the downstream side cut by the second cutter bites into a part arranged at a position beyond the area.Without being transported to the downstream side of the supply path and discharged outside the deviceTherefore, removing the paper is easy.Further, the side edge portion of the long sheet on the downstream side cut by the first and second cutters does not bite into the parts arranged in the position beyond the region, and from the through-hole to the apparatus main body. Because it is discharged to the outside, there is no risk of trouble. However, since the sensor and the first and second cutters are provided on the upstream side of the feeding means, the skew of the long sheet can be detected at an early stage, and the area defined in the width direction of the supply path It is possible to cut the side edge portion of the long paper exceeding the limit at an early stage, and it is possible to suppress wasteful use of the paper and toner as much as possible.
[0047]
  Also,A roller is provided on the guide plate, and the roller sends out the side edge portion of the cut long sheet toward the through-hole.When it comes toThe side edge part can be reliably discharged from the through-hole to the outside of the device body..
[0048]
Further, the predetermined length of the long paper in the control means is such that the long paper in the downstream area cut by the second cutter has a length that can be conveyed at least downstream of the supply path. If the length is set, the sheet can be more reliably conveyed downstream of the supply path and discharged to the outside of the apparatus.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is an external perspective view of an image forming apparatus according to an embodiment of the present invention.
3 is a longitudinal sectional view of a main part of the image forming apparatus shown in FIGS.
FIG. 4 is a flowchart showing a procedure for setting a long paper mode.
FIG. 5 is a diagram showing details in the vicinity of a paper feed unit.
FIG. 6 is a diagram when FIG. 5 is viewed from the right side.
FIG. 7 is a diagram illustrating a state when a long sheet is supplied while being skewed.
[Explanation of symbols]
1 Image forming device
14 Manual paper feeder
15 Bypass tray
17 Long paper
26 Feed roller
36, 37 Registration roller
50 cutter
80 Supply path
81, 82 Skew detection sensor
91 Vertical cutter
92 Guide plate
93 Discharge roller
94 opening
F Supply direction of long paper 17
W width of supply path 80

Claims (4)

In an image forming apparatus that performs image forming processing by supplying a long paper longer than a standard paper,
A supply means for sending the long paper toward the image forming unit where image forming processing is performed is provided in the long paper supply path,
Sensors that react to the side edges of the long paper exceeding the area defined in the width direction of the supply path on both sides of the supply path on the upstream side of the delivery means, and the long paper that exceeds the area A first cutter for cutting a side edge portion of the paper along the supply path, and in this order from the upstream side with respect to the supply path,
A second cutter that is movable in the width direction of the supply path and cuts the long paper in the moving direction is provided on the upstream side of the sensor ,
A guide plate is provided in the vicinity of the first cutter, and a through-hole penetrating from the end of the guide plate to the outside of the apparatus main body is provided .
When the sensor reacts, the long paper is continuously supplied for a predetermined length, and then the long paper is cut by the second cutter and the long paper on the upstream side of the second cutter. Comprising control means for controlling the supply operation to stop ,
The long paper in the region on the downstream side cut by the first and second cutters is conveyed to the downstream side of the supply path and discharged to the outside of the apparatus, and the first and second papers are discharged. A side edge portion of the long sheet on the downstream side cut by a cutter is discharged from the through hole to the outside of the apparatus main body while being guided out of the supply path by the guide plate. Image forming apparatus. The image forming apparatus according to claim 1, wherein a roller is provided on the guide plate, and the roller sends out a side edge portion of the cut long sheet toward the through-hole . The long paper in the control means is so long that the long paper in the region on the downstream side cut by the second cutter has a length that can be transported to at least the downstream side of the supply path. the image forming apparatus according to claim 1 or 2, characterized in that the predetermined length is set. The image forming apparatus according to claim 1 , wherein the sensor is a PI sensor .

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