1. Field of the Invention
The present invention relates to an image forming system which cuts a roll sheet to form an image by an image forming portion.
2. Description of Related Art
In recent years, the print demand has been changed. Print on demand (hereinafter, referred to as “POD”) for performing various small-lot prints has been increased in comparison with the demand for printing a large quantity of the same print matters. In the print demand like POD, cost and time loss are high in an offset printing apparatus which needs to make a printing plate and a screen for each print like a printing press. There have been great expectations for an electrophotograph image forming apparatus.
In the related art, many electrophotograph image forming apparatuses store recording sheets which are cut to a predetermined size such as an A system or a B system in a paper manufacturing process in a feeding deck and feed them one by one therefrom to perform image formation. Such feeding system is assumed to be used in offices and at home. As in the offset printing apparatus, when a large number of recording sheets are printed, they run out in the feeding deck immediately. A large-capacity feeding deck which increases a storable number of sheets has been typically known. The recent technical progress has been remarkable. The productivity of the electrophotograph image forming apparatus has been improved drastically. The problem that the sheets run out immediately even in the large-capacity feeding deck cannot be solved.
In recent years, it has been proposed that the problem is solved by multiply-coupling the large-capacity feeding decks. The problem that sheets to be fed run out immediately can be solved by multiply-coupling the large-capacity feeding decks. The cost for preparing for plural large-capacity feeding decks is increased. The entire apparatus is made larger.
As a method for solving these problems, there has been typically known a roll sheet feeding unit as seen in the offset printing apparatus, in which an uncut roll sheet is provided and is cut at the time of printing for feeding. An apparatus in which the roll sheet unit is attached to the electrophotograph image forming apparatus has been actually proposed (Japanese Patent Application Laid-Open (JP-A) No. 2005-250273).
The roll sheet feeding unit can produce recording sheets of which number is larger than that of the recording sheets previously cut. The frequency in which the sheets to be fed run out can be reduced. There is a merit that the cost for feeding the recording sheets can be reduced.
Japanese Patent Application Laid-Open (JP-A) No. 2007-136717 discloses a configuration which cuts a roll sheet so as to stack and store cut sheets in a storage portion and feeds the sheets from the storage portion to the image forming portion. The operation of cutting the roll sheet and feeding the cut sheets to the storage portion so as to stack them in the storage portion and the operation of feeding the sheets from the storage portion to the image forming portion cannot be performed at the same time. The productivity of the configuration of JP-A No. 2007-136717 is low.
The present invention provides an image forming system which uses a roll sheet to efficiently feed cut sheets for enabling image formation.
The representative configuration in the present invention for solving the above problems is an image forming system having: a sheet feeding unit which cuts a roll sheet and feeds cut sheets, a stack unit which stacks and stores the sheets fed by the sheet feeding unit and feeds the stored sheets, an image forming portion which forms an image on the sheets fed from the stack unit, and a controlling unit configured to control the feeding unit and the stack unit so that the stack unit feeds a sheet stored in the stack unit to the image forming portion when the sheet feeding unit feeds a sheet to the stack unit so as to stack the sheet from the sheet feeding unit into the stack unit.
The present invention can provide the image forming system which uses the roll sheet to efficiently feed the cut sheets for enabling image formation.
Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).
An image forming system according to an embodiment of the present invention will be described specifically with reference to the drawings.
[First Embodiment]
The Overall Configuration of the Image Forming System
The overall configuration of the image forming system will be described with reference to
The image forming system according to this embodiment is largely divided into an image forming apparatus 100, a recording sheet stack unit 200, a roll sheet cut unit 300, and a roll drive unit 400.
The roll drive unit 400 and the roll sheet cut unit 300 configure a sheet feeding unit which feeds a roll sheet S2 from a sheet roll S1 on which the sheet is wound, cuts the roll sheet S2 to a predetermined size, and feeds cut sheets S3. The recording sheet stack unit 200 configures a stack unit which stacks and stores the cut sheets.
The roll S1 on which the long sheet is wound is rotatably attached to the roll drive unit 400. A rotational shaft 1401 is rotated by a driving source, not illustrated, to rotate the roll S1, thereby feeding the roll sheet S2. The fed roll sheet S2 is cut to the predetermined size by the roll sheet cut unit 300. The cut sheets cut by the roll sheet cut unit 300 are conveyed to the recording sheet stack unit 200 and are then stacked in a recording sheet stack portion 203. When performing image formation, the image forming apparatus 100 as an image forming portion feeds the cut sheets stacked in the recording sheet stack portion 203 to perform recording.
<Image Forming Apparatus>
The image forming apparatus 100 of this embodiment is a copying machine which performs printing by an electrophotograph process.
The read information is recorded onto a recording sheet by the image forming portion. Specifically, a photosensitive drum 104 is irradiated with a laser beam output by the exposure portion 103 and an electrostatic latent image is formed on the photosensitive drum 104. The electrostatic latent image on the photosensitive drum 104 is toner developed by a development device 105 so as to be a visible image. The toner image is transferred onto the conveyed sheet for image formation, is fixed by a fixing device 106, and is discharged onto a discharge tray 107.
<Sheet Stack Unit>
The sheet stack unit 200 as a stack unit will be described.
The cut sheets S3 cut by the roll sheet cut unit 300 are fed to the sheet stack unit 200. These cut sheets are stacked in the recording sheet stack portion 203. A regulation plate 204 of the recording sheet stack portion 203 is slidable in the double-headed arrow A direction of
To align the fed recording sheets, the regulation plate 204 performs a regulation operation, if necessary, and aligns the cut sheets fed from a feeding path 201 so that they are not disordered.
The recording sheet stack portion 203 has a feeding portion (a supplying unit) 202 which receives a feeding signal and feeds the cut sheets to the image forming portion when the image forming apparatus 100 performs image formation. The feeding portion 202 separates the lowermost sheet stacked in the recording sheet stack portion 203 from other sheets and then feeds (supplies) the sheet to the image forming apparatus 100. The sheets are fed from the sheet stack unit 200 to the image forming apparatus 100 and, at the same time, the cut sheets fed from the roll sheet cut unit 300 can be stacked on the stacked sheets.
The quantity of the cut sheets S3 stacked in the recording sheet stack portion 203 is determined depending on the productivity of the roll sheet cut unit 300 and the roll drive unit 400. The quantity of the recording sheets fed from the recording sheet stack portion 203 to the image forming portion of the image forming apparatus 100 is determined depending on the productivity of the image forming apparatus 100.
<Roll Sheet Cut Unit>
Next, the roll sheet cut unit 300 as a sheet feeding unit will be described. In
The roll sheet slacking portion 301 slacks the roll sheet when the feeding speed of the roll sheet S2 fed from the roll drive unit 400 is higher than that of the cut sheets S3 fed to the image forming apparatus. This prevents the excessive feeding of the roll sheet from the roll drive unit 400.
The fed roll sheet S2 is curled in a roll direction and is decurled by the decurler portion 302. The decurler portion 302 has a pair of pressed rollers. When passing through the nip of the pair of rollers, the sheet is decurled. The decurl amount can be controlled by changing the nip pressure of the pair of rollers by a pressing mechanism, not illustrated.
The decurler portion 302 controls the decurl amount according to the remaining amount of the sheet, the thickness of the sheet, and the type of the sheet held in a memory portion. As the remaining amount of the sheet is reduced, the roll diameter of the sheet is smaller and the curl amount is larger. As the remaining amount of the sheet is reduced, the decurl amount is larger.
The cutter unit portion 303 is a unit which cuts the conveyed roll sheet to a desired conveying direction length by a cutter (not illustrated) and feeds cut sheets into the recording sheet stack portion 203. For cutting by the cutter, the length of the sheets is measured by an encoder attached to the roller conveying the sheets to determine the cutting timing.
After cutting, the cut sheets are conveyed at a speed higher than the roll sheet feeding speed and are then fed to the image forming apparatus while a constant interval between the sheets is held. Cutting by the cutter is executed after the sheet conveyance is stopped. At the time of the sheet cutting, the roll sheet is fed from the roll drive unit 400. The sheet of the feeding length is held while a constant tension is applied by the roll sheet slacking portion 301.
<Feeding and Cutting of the Roll Sheet>
As illustrated in the flowchart of
The feeding of the roll sheet is controlled according to the remaining amount of the roll sheet and the thickness of the sheet.
In order to make the sheet feeding speed (sheet surface speed) constant, the roll motor need be controlled based on the remaining amount of the roll sheet itself. The roll diameter and the sheet surface speed are changed according to the remaining amount of the sheet. It is necessary to consider the speed according to the thickness of the roll sheet. In
The controlling portion of the image forming apparatus 100 controls the remaining amount of the roll sheet by summation of sheet lengths stored in the memory portion, not illustrated. The remaining amount of the roll sheet is calculated based on the number of rotations counted by the encoder provided in the roll motor and the thickness of the sheet stored in the memory portion. It is because when the thickness of the sheet is large at the same number of rotations, the rate to the entire amount of the sheet used is high.
Namely, the driving speed of the roll motor is increased as the remaining amount of the roll sheet is smaller. As compared with the thin sheet, the thick sheet increases the rate of the change in the speed of the roll motor. This can make the sheet surface speed constant to feed the roll sheet.
<Controlling Portion>
A feeding ACC I/F (Interface) 520 is a feeding accessory or in this embodiment, a circuit for communication with the roll drive unit 400. Data exchange with the roll drive unit 400 is realized using this circuit. A stacker remaining recording sheets calculation unit 521 calculates the number of the sheets fed to the recording sheet stack unit 200 and the number of the sheets fed from the recording sheet stack unit 200 based on data communicated via the feeding ACC I/F 520. The number of sheets stored in the recording sheet stack unit 200 is calculated.
A copy job and a scan job are generated according to the informed operation mode by the program of the job controlling portion 501. The job controlling portion 501 is connected to a reader control communication I/F 506, a PDL control communication I/F 507, and a print controlling portion 511. The entire control of the image forming apparatus 100 is managed by the job controlling portion 501.
The reader control communication I/F 506 is a communication I/F with a CPU circuit, not illustrated, which controls the reading portion 102 reading an original image. The PDL control communication I/F 507 is a communication I/F with a CPU circuit of a PDL image controlling portion, not illustrated, which develops PDL image data transmitted from a personal computer, not illustrated, to a bitmap image. The print controlling portion 511 drive controls the image controlling portion 502 which controls image data to generate image data which transmits the PDL image and the reader image to each development station of the image forming apparatus 100 and each load and forms an image.
An image controlling portion 502 is a circuit which sets each image related circuit according to the job generated by the job controlling portion 501. In this embodiment, the image controlling portion 502 sets an image selector 510 which determines which of the PDL image data transmitted from a PDL image I/F 508 and the reader image transmitted from a reader image I/F 509 is effective to an image memory 503. The image controlling portion 502 sets in which area of the image memory 503 the image data from the image selector 510 is stored. The image controlling portion 502 performs the setting of an image stacking portion 505 configured by a nonvolatile memory typified by a hard disk, the setting of compressing the bitmap image data from the image memory 503 to transmit the compressed data to the image stacking portion 505, and the setting of an image compression extension portion 504 which extends the compressed image data from the image stacking portion 505 to return the extended data to the image memory 503. To actually develop and record the image data, color image data is read from the image memory 503 and is then subjected to desired image processing by an image processing portion 514.
The print controlling portion 511 receives image data of color finally transmitted by a color decomposition portion 516 according to each of the settings of the image controlling portion 502 set by the contents instructed from the job controlling portion 501. The print controlling portion 511 provides an instruction to a print image controlling portion 513 so as to transmit the image data to an exposure controlling portion 110. The print image controlling portion 513 sets an LUT (Look Up Table) 515 in which the sensitivity characteristic of the photosensitive member is reflected to the image data according to the instruction from the print controlling portion 511. The LUT 515 also changes the image density of the input image data to a desired density when the image density is not the desired density due to the change in the sensitivity characteristic on the photosensitive member, the laser exposure amount, and the charging amount from a primary charger. The image data via the LUT 515 of each color is output to a laser beam circuit portion 517. A latent image is formed on the photosensitive member by the development device 105.
A sheet conveying controlling portion 518 controls the sheet conveyance by the image forming apparatus 100 and the operations of the sheet stack unit 200, the roll drive unit 400, and the roll sheet cut unit 300.
When the cut sheets are stored in the sheet stack portion 203, the sheet size selected from the operation portion 500 is informed to cut the roll sheet S1 so as to have the specified size by the cutter unit portion 303. The informing of the size is selected by pressing the select button for each size provided in the operation portion 500. When the sheets are stacked in the recording sheet stack portion 203, only the previously specified size is selectable.
<Timing for Feeding the Cut Sheets to the Sheet Stack Portion>
Timing for feeding the cut sheets to the sheet stack portion of this embodiment will be described.
In this embodiment, as illustrated in
The image forming interval for each of the sheets of the image forming portion for continuous image formation is t1, and the feeding interval for each of the sheets in which the sheets cut by the roll sheet cut unit 300 is continuously fed to the sheet stack unit 200 is t2. The feeding state of the cut sheets from the roll sheet cut unit 300 can be switched between a first sheet feeding state in the relation of t1<t2 and a second sheet feeding state in the relation of t1>t2. According to the result from a sheet quantity determination unit (stack quantity detection unit) which determines the quantity of the sheets (stack quantity) stacked in the sheet stack unit 200, when the quantity of the stacked sheets is below a predetermined quantity, the sheets are fed to the sheet stack unit 200 in the first sheet feeding state. When the quantity of the stacked sheets is above the predetermined quantity, the sheets are fed to the sheet stack unit 200 in the second sheet feeding state.
This operation will be described specifically. When image formation is started, the recording sheets are fed from the sheet stack portion 203 to the image forming apparatus. The recording sheet stack portion 203 stores over a predetermined number of the recording sheets (a first predetermined number of sheets) until a timing T1. The roll sheet cut unit 300 cuts the roll sheet at a predetermined second cut interval to feed the cut sheets to the sheet stack unit 200 (the second feeding state). The cut interval is longer than the feeding interval of the cut sheets to the image forming portion. Therefore the quantity of the cut sheets stacked in the sheet stack unit 200 is reduced.
When the number of the recording sheets stacked in the sheet stack unit 200 at the timing T1 is below the first predetermined number of sheets, the roll sheet cut unit 300 cuts the roll sheet at a first cut interval which is a cut interval shorter than the second cut interval to feed the cut sheets to the sheet stack unit 200 (the first feeding state).
The first cut interval is shorter than the feeding interval of the cut sheets to the image forming portion. Therefore, the number of the cut sheets stacked in the sheet stack unit 200 is increased. At a timing T2, the quantity of the remaining recording sheets is above the first predetermined number of sheets again. The roll sheet cut unit 300 cuts the recording sheets at the second cut interval again. When the quantity of the remaining recording sheets is below the first predetermined number of sheets at a timing T3, the recording sheets are cut at the first cut interval again for feeding.
The plural thresholds of the quantity of the remaining sheets stacked in the sheet stack unit 200 may be set to switch between the first cut interval and the second cut interval.
There will be described a flowchart which detects the number of the remaining recording sheets in the sheet stack unit 200 feeding the recording sheets to the image forming apparatus 100 by the stacker remaining recording sheets calculation unit 521 as the stack quantity detection unit will be described with reference to
When the cut process is started in S1000, the sheet feeding completion information or the sheet discharge completion information is received from the recording sheet stack unit 200 via a feeding ACC I/F 320. The sheet feeding completion information is informed when the recording sheets are fed by the roll sheet cut unit 300. The sheet discharge completion information is informed when the feeding of the recording sheets is completed from the recording sheet stack unit 200 to the image forming apparatus 100. In S1001, the informing of either the sheet feeding completion information or the sheet discharge completion information is waited for and, if there is no informing, the routine is advanced to S1004. If there is informing, the routine is advanced to S1002 to determine whether the informed information is the feeding completion information. If the informed information is the feeding completion information, one is added to the number of the remaining recording sheets in S1003. If not, one is subtracted from the number of the remaining recording sheets in S1005. In S1004, it is determined whether the cut process of the roll sheet is ended. If the cut process of the roll sheet is ended, the routine is advanced to S1006 to end the process. If the cut process is continued, the routine is returned to S1001 to check whether the feeding completion information or the discharge completion information is informed.
When the image forming process is started in S1100, the first cut interval is informed via the feeding ACC I/F 320 to the roll sheet cut unit 300 in S1101. In S1102, the number of the remaining recording sheets in the recording sheet stack unit 200 detected by the flowchart of
The sheets are thus fed in this way. The image forming system which uses the roll sheet to efficiently feed the cut sheets for enabling image formation can be provided.
In this embodiment, the state of cutting the roll sheet to feed the cut sheets to the sheet stack unit 200 is changed in association with the sheet intervals in the image forming portion. When the detection unit detects that the quantity of the sheets stacked in the sheet stack unit 200 is below the predetermined quantity, the roll sheet cut unit 300 may feed the sheets to the sheet stack unit 200.
In the above description, there has been illustrated the example in which the lowermost one of the sheets stacked in the sheet stack unit 200 is fed to the image forming apparatus 100. The uppermost sheet may be fed to the image forming apparatus 100.
There has been illustrated the form in which the control of the sheet stack unit 200, the roll sheet cut unit 300, and the roll drive unit 400 is performed by the sheet conveying controlling portion 518 of the image forming apparatus 100. A controller may be provided in the sheet stack unit 200 or the roll sheet cut unit 300 so that the controller arranged in the sheet stack unit 200 or the roll sheet cut unit 300 may control the sheet stack unit 200, the roll sheet cut unit 300, and the roll drive unit 400 according to a request from the image forming apparatus 100. The controller may be provided in each of the units.
[Second Embodiment]
An apparatus according to a second embodiment will be described. The basic configuration of the apparatus of this embodiment is the same as the first embodiment and the overlapped description is omitted. The configuration which is the feature of this embodiment will be described here.
In the first embodiment, there has been illustrated the example in which the feeding speed of the cut sheets to be fed to the sheet stack unit 200 is changed corresponding to the image forming speed. In this embodiment, the sheet feeding speed is changed according to the quantity of the sheets stacked in the sheet stack unit 200.
Specifically, the quantity of the sheets stacked in the sheet stack unit 200 is detected and, when the quantity of the sheets is below the predetermined quantity, the feeding speed of the cut sheets from the roll sheet cut unit 300 is higher than the set value. When the quantity of the sheets stacked in the sheet stack unit 200 is above the predetermined quantity, the feeding speed of the cut sheets from the roll sheet cut unit 300 is lower than the set value.
The control procedure for that operation is illustrated in the flowchart of
If the quantity of the remaining sheets is below the predetermined quantity, the rotation speed of the sheet roll by the roll drive unit 400 is set to be higher than the reference value and the feeding speed of the cut sheets to the sheet stack unit 200 is increased. The feeding quantity is set to be somewhat larger (S402 and S404).
The roll sheet is cut at the set feeding speed and the cut sheets are fed to the sheet stack unit 200 (S405). The cut sheets are fed until the set feeding quantity is reached, thereby stopping the rotation of the roll (S406 and S407).
The cut sheets are thus fed. Therefore, the recording sheets cut from the roll sheet can be stably fed to the image forming apparatus 100.
[Third Embodiment]
An apparatus according to a third embodiment will be described. The basic configuration of the apparatus of this embodiment is the same as the first embodiment and the overlapped description is omitted. The configuration which is the feature of this embodiment will be described here.
<Sheet Stack Unit>
In the first embodiment, the roll sheet is cut by the roll sheet cut unit 300, the cut sheets are stacked in the sheet stack unit 200, and the stacked cut sheets are fed to the image forming apparatus 100. The cut sheets to be fed are stacked on the upper portion of the sheets stacked in the sheet stack unit 200. The sheet stacking operation and the operation of feeding the sheets from the upper portion of the stacked sheet bundle to the image forming apparatus 100 are difficult to be performed at the same time. In this embodiment, plural stack portions are provided in the sheet stack unit 200.
As illustrated in
The two stack portions 203a and 203b can be moved up and down by a moving mechanism 299. As illustrated in
As illustrated in
If there is the only one stack portion stacking the sheets, it is considered that while the sheets are stacked in the stack portion, the sheets cannot be fed from the stack portion and the operation of the image forming apparatus need be stopped. In this embodiment, the two stack portions are provided and are used alternately. When the sheets are fed from the roll sheet cut unit 300 to the sheet stack unit 200 so as to stack the sheets in one of the stack portions, the sheets stacked in the other stack portion are fed to the image forming apparatus 100.
Regulation plates 204a and 204b which are regulation members regulating and aligning the edge positions of the stacked cut sheets are slidable in the double-headed arrow A direction of
<Sheet Stack Operation>
The operation of the sheet stack unit 200 of this embodiment will be described.
If the first stack portion 203a is stacking the sheets, to feed the sheets from the second stack portion 203b (referred to as a “stack portion B” in
If the first stack portion 203a is not stacking the sheets, to feed the sheets from the first stack portion 203a, the first stack portion feeding flag is turned on (S506) to feed the sheets from the first stack portion 203a (S507). When the feeding from the first stack portion 203a is ended, the first stack portion feeding flag is turned off (S508) and the routine is ended.
If there is not the sheet feeding request in S501, it is determined whether the stack request is received (S509). If the sheet stack request is received, it is determined whether the first stack portion 203a is feeding the sheets (S510).
If the first stack portion 203a is feeding the sheets, to stack the sheets in the second stack portion 203b to respond to the received stack request, the second stack portion stacking flag is turned on (S511) to stack the sheets in the second stack portion 203b (S512). When the stacking in the second stack portion 203b is ended, the second stack portion stacking flag is turned off (S513) and the routine is ended.
If the first stack portion 203a is not feeding the sheets, to stack the sheets in the first stack portion 203a to respond to the received stack request, the first stack portion stacking flag is turned on (S514) to stack the sheets in the first stack portion 203a (S515). When the stacking operation in the first stack portion 203a is ended, the first stack portion 203a stacking flag is turned off (S516) and the routine is ended.
When the sheets are received in the stack portion, the stack portion is moved to the height suitable for receiving the sheets and is coupled to the receiving path 205 (S611). The regulation plate is moved to the defined position (the retracted position) which is easy to receive the sheets (S612). When the sheets are ready to be received, the cut sheets are received (S613) to sequentially stack the received sheets (S614). The aligning of the sheet edge positions by the regulation plate is executed to the stacked sheets (S614).
The stack portion is moved to the height suitable for the sheet feeding operation (S711) to pick up one of the stacked sheets (S712). The pickup sheet is conveyed to the image forming apparatus 100 (S713).
In this embodiment, the plural sheet stack portions are provided. The reception of the sheets from the roll sheet cut unit 300 and the feeding of the sheets to the image forming apparatus 100 can be performed at the same time.
The sheet stack unit 200 has a direct conveying path 298 which conveys the sheets received from the roll sheet cut unit 300 to the image forming apparatus 100 not via the first stack portion and the second stack portion. The direct conveying path 298 is a conveying path used for feeding the sheets of a size other than the predetermined size of the sheets stacked in the sheet stack unit 200 to the image forming apparatus 100.
[Modification of the Third Embodiment]
The form in which the receiving path 205 has one outlet and each of the plural stack portions is moved to the position receiving the sheets from the outlet of the receiving path 205 and the position feeding the stacked sheets by the first and second sheet separation feeding portions 206a and 206b has been described as the third embodiment. The form may be configured as in the modification illustrated in
In the image forming system illustrated in
The stacking of the sheets into the sheet stack unit 200 and the operation of feeding the sheets from the sheet stack unit 200 may be executed as follows. When the first stack tray 902 is empty while the sheets are continuously fed from the first stack tray 902 to the image forming apparatus 100, the sheets are fed from the second stack tray 901. At that time, the sheets are fed from the roll sheet cut unit 300 to the empty first stack tray 902 so that the sheets are stacked in the first stack portion 205a. It is determined based on a first sheet presence/absence sensor 902a that the first stack tray 902 is empty.
When the second stack tray 901 is empty while the sheets are fed from the second stack tray 901 to the image forming apparatus 100, the sheets are fed from the first stack tray 902. At that time, the sheets are fed from the roll sheet cut unit 300 to the empty second stack tray 901 so that the sheets are stacked on the second stack tray 901. It is determined based on a second sheet presence/absence sensor 901a that the second stack tray 901 is empty.
[Fourth Embodiment]
An apparatus according to a fourth embodiment will be described. The basic configuration of the apparatus of this embodiment is the same as the first embodiment and the overlapped description is omitted. The configuration which is the feature of this embodiment will be described here.
<Sheet Stack Unit>
In the first embodiment, the cut sheets fed from the roll sheet cut unit 300 are stacked in the sheet stack unit 200 and are then fed to the image forming apparatus 100.
In the first embodiment, only the sheets stacked in the sheet stack unit 200 can be fed to the image forming apparatus 100. When the recording sheets of a different size are desired to be fed to the image forming apparatus 100, the sheets remaining in the sheet stack unit 200 need be removed by the user or be automatically discharged.
In the present embodiment, the sheets of a size different from the size of the sheets stacked in the sheet stack unit 200 can be fed to the image forming apparatus 100.
In this embodiment, there is provided the direct conveying path which feeds the sheets cut by the roll sheet cut unit 300 to the image forming apparatus 100 not via the sheet stack unit 200.
When the sheets of a size other than the predetermined size of the sheets stacked in the sheet stack unit 200 are fed to the image forming apparatus 100, they pass through the direct conveying path and are then fed to the image forming apparatus 100.
Specifically, as illustrated in
<Sheet Feeding Operation>
In the above configuration, by the input from the operation portion, when the setting of the selected recording sheet size and the setting of the size of the sheets stacked in the stack portion 203 are the same, the sheets are automatically fed from the stack portion 203 by the sheet supplying unit 600.
By the input from the operation portion, when the setting of the selected recording sheet size and the setting of the size of the sheets stacked in the stack portion 203 are different, the sheets are cut to the selected recording sheet size by the roll sheet cut unit 300 and the cut sheets are fed by the direct feeding portion 601.
The sheets are thus fed. Therefore, the sheets of a size other than the size of the sheets stacked in the sheet stack unit 200 can be fed to the image forming apparatus 100 without providing the plural sheet stack portions. Thus, the recording sheets of an arbitrary size can be fed to the image forming apparatus 100 without making the apparatus larger.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefit of Japanese Patent Application No. 2008-288355, filed Nov. 11, 2008, which is hereby incorporated by reference herein in its entirety.
Number | Date | Country | Kind |
---|---|---|---|
2008-288355 | Nov 2008 | JP | national |
Number | Name | Date | Kind |
---|---|---|---|
3612511 | Godlewski | Oct 1971 | A |
3709595 | Turner et al. | Jan 1973 | A |
3830590 | Harris et al. | Aug 1974 | A |
4478400 | Commers | Oct 1984 | A |
4866472 | Yamakoshi et al. | Sep 1989 | A |
4968014 | Yamakoshi et al. | Nov 1990 | A |
5474287 | Takahashi | Dec 1995 | A |
5512993 | Endo et al. | Apr 1996 | A |
5532799 | Watanabe et al. | Jul 1996 | A |
5575463 | Parkander | Nov 1996 | A |
5588758 | Yamamoto | Dec 1996 | A |
5642949 | Yamamoto | Jul 1997 | A |
6246491 | Matsumoto et al. | Jun 2001 | B1 |
6397035 | Kataoka et al. | May 2002 | B2 |
6751426 | Akiba et al. | Jun 2004 | B2 |
6793425 | Yoshikawa et al. | Sep 2004 | B2 |
7050751 | Watanabe et al. | May 2006 | B2 |
7391980 | Sekiguchi et al. | Jun 2008 | B2 |
20080246205 | Fujii et al. | Oct 2008 | A1 |
20090323094 | Hayashi et al. | Dec 2009 | A1 |
Number | Date | Country |
---|---|---|
59-86527 | May 1984 | JP |
63-8131 | Jan 1988 | JP |
1-106060 | Apr 1989 | JP |
2005-250273 | Sep 2005 | JP |
2007-136717 | Jun 2007 | JP |
Number | Date | Country | |
---|---|---|---|
20100117289 A1 | May 2010 | US |