CN1784635A - Image forming device - Google Patents

Abstract

A line sensor (51) for detecting the edge location of a recording sheet is installed on the upstream side of a transfer point (G) where an image formed on a first photosensitive drum (3a) is transferred to a recording sheet. In order to form an image without white border, when the edge location of the recording sheet is detected, the size of the transfer image on the first photosensitive drum (3a) to the recording sheet is made small depending on the result of the detection by the line sensor (51). The image of thus changed size on the first photosensitive drum (3a) is formed successively on the recording sheet.

Description

Image processing system

Technical field

The present invention relates to a kind of image processing system of electrofax mode, in particular to be not transferred on the paper and the countermeasure of the amount of the developer that is recovered to a kind of the minimizing as far as possible.

Background technology

Generally speaking, in this image processing system, make electrostatic latent image, this electrostatic latent image is developed in developing apparatus, and the developer image is formed on the image-carrier according to the view data that is input on the image-carrier.To be formed on developer image on this image-carrier to the paper that sends, in fixing device, make fusion of developer image and photographic fixing on paper afterwards by heat and pressure.

But when taking place to transmit the position deviation that deviation etc. causes because of paper between developer image that forms on the image-carrier and the paper that sends, the position of the position of the original image that reads and the image of making dissimilates.The transmission deviation of this paper in most cases is uncertain, according to the size of paper, the difference of kind, perhaps accommodates the difference of accepting unit of paper and difference.Therefore, when the non-flanged image that carries out forming image on whole of paper forms (image forms) comprehensively,, be transferred to produce in the image on the paper and lose, forms very ugly image formation thing when between developer image and the paper during occurrence positions deviation.

Therefore, consider that developer image and the paper between the paper on the image-carrier transmit the caused position deviation of deviation, carry out following correspondence: the image (developer image) that on image-carrier, is formed with the large-size of surplus, even under the situation that produces paper transmission deviation, also can form the preferable image of not losing like this.

But in said apparatus, when the formation size significantly surpasses the image of the paper that sends on image-carrier, be not transferred to paper and increase by the developer that cleaning unit is recovered, can't utilize once more in the image processing system of the developer that is reclaimed, the developer that reclaims is dropped, be very uneconomic, and the cycle that the developer that reclaims overflows become very short.And, as shown in figure 25, in the cleaning unit c that has been wholely set container a (the developer t on the transfer belt d of said vesse a recovery absorption and transmission paper p), the developer t that is reclaimed is at the position of the left and right sides portion that is arranged in the paper p vertical with paper conveyance direction, part deflection and a large amount of the storage, the developer t branch that reclaims leaks, and is easy to take place cleaning problems.

Therefore, exist in the prior art with lower device: paper conveyance direction upstream one side of leaning at the transfer printing point that is transferred to paper than the image that forms on image-carrier, be provided for detecting the detecting unit of the end position of the paper that transmits to transfer printing point, according to the picture size of determining by the detected antiquarian of this detecting unit on the image-carrier, determine the image that forms on the image-carrier after the size according to this and on paper, form image, thereby on image-carrier, form its size and the image that the paper that sends mates, be not transferred to paper and the developer (for example opening flat 10-186951 communique) of the unit recovery that is cleaned with reference to the spy to reduce.

But, in above-mentioned existing apparatus, because detecting unit forms image after carrying out the detection of paper end position on image-carrier after the picture size of having determined on the image-carrier, therefore detecting unit need be provided with far away than the close paper conveyance direction upstream of transfer printing point one side.So, the paper transport path that begins till the transfer printing point from the check point of the paper end position of detecting unit must be very long on paper conveyance direction, and it is very big that the size of image processing system just becomes.If elongated from the paper transport path that the check point of detecting unit begins till the transfer printing point, then image forms the required time and also becomes elongated thereupon.

And, if it is elongated from the paper transport path that the check point of the paper end position of detecting unit begins till the transfer printing point, then the accuracy of detection of the paper end position of detecting unit is understood step-down, have because of paper transmits deviation and cause the danger that generation is lost on the paper, if and with detecting unit near the transfer printing point, then in the moment of the end position that detects paper, begun to write to the image of image-carrier, image-carrier epigraph determining dimensions is not in time carried out.

And than image-carrier near paper conveyance direction upstream one side, be provided with positioning unit as the sequential matching unit, be used to make the location matches of the paper of the image that forms on this image-carrier and transmission, after the paper that sends is temporarily stopped, carry out the sequential coupling, and begin once more.This positioning unit not only has the function of the image that makes on the image-carrier and sequential coupling, and has the function of crooked (the tilting to transmit) of correcting the paper that sends.

But the crooked function of the rectification of this positioning unit is limited, crookedly can't carry out correcting deflection fully for what overrun, and the situation that paper sheet askew transmits takes place once in a while.In this case, in order to judge the askew status of paper, must carry out the detection of end position to the paper that sends in the many places of direction of transfer, therefore in order earlier to judge the askew status of paper than the moment that forms image on the image-carrier, the position that must make detecting unit is paper conveyance direction upstream one side further away from each other.When making this detecting unit be positioned at, must further make image processing system become big than the more close paper conveyance direction of positioning unit downstream one side.

Summary of the invention

The present invention produces in view of above each point just, its purpose is to provide a kind of image processing system, can shorten from check point and begin paper transport path till the transfer printing point, realize densification when guaranteeing the accuracy of detection of the end position of paper end position that detecting unit carries out or paper and askew status, and reduce the developer that reclaims by cleaning unit as far as possible, and prolong developer and overflow the cycle, can effectively prevent to clean simultaneously bad.

Image processing system of the present invention is, view data according to input forms image on image-carrier, above-mentioned image is transferred on the paper that is transmitted, and on this paper, form image, this image processing system is characterised in that: in upstream one side that is transferred to the more close paper conveyance direction of transfer printing point of above-mentioned paper than the image that forms on above-mentioned image-carrier, detecting unit is set, be used to detect the end position of the above-mentioned paper that transmits to above-mentioned transfer printing point, when the picture size on the above-mentioned image-carrier than when the size of the above-mentioned paper of above-mentioned transfer printing point transmission is big, be transferred to the size of images on the above-mentioned paper above-mentioned image-carrier midway after the detection of the above-mentioned paper end position that above-mentioned detecting unit is carried out, testing result according to above-mentioned detecting unit changes, image on the above-mentioned image-carrier that is changed according to this size, the image to above-mentioned paper after proceeding forms.

Form device according to this inventive images, before above-mentioned detecting unit carries out the detection of above-mentioned paper end position, for the above-mentioned paper that sends to above-mentioned transfer printing point, transfer printing is than the image on the big above-mentioned image-carrier of above-mentioned antiquarian, when detecting the end position of above-mentioned paper by above-mentioned detecting unit, according to this testing result, the picture size on the above-mentioned paper above-mentioned image-carrier midway of change transfer printing.That is, before the testing result of the above-mentioned paper end position that the above-mentioned detecting unit of acquisition carries out and after detecting, the picture size that forms on the above-mentioned image-carrier is changed.Therefore, before above-mentioned detecting unit detects, even do not carry out the detection of above-mentioned paper end position,, can because of transmitting deviation, above-mentioned paper cause that the good image of missing image is transferred on the above-mentioned paper with not taking place by than the image on the big above-mentioned image-carrier of above-mentioned antiquarian.After above-mentioned detecting unit detects, even above-mentioned image-carrier epigraph determining dimensions is not in time carried out, also can be according to the testing result of the end position of above-mentioned paper, change picture size on the above-mentioned image-carrier based on the size of above-mentioned paper end position.So, can reduce the developer that is not transferred to above-mentioned paper and is recovered by cleaning unit as much as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in the incorporate cleaning unit of the container of the developer of accommodating recovery, the developer that can suppress to reclaim is the developer deflection of more storage partly, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And, by carry out on above-mentioned image-carrier, forming image before the above-mentioned paper end position detection at above-mentioned detecting unit, above-mentioned detecting unit is provided with near above-mentioned transfer printing point.So, the transfer path that begins the above-mentioned paper till the above-mentioned transfer printing point from the check point of the above-mentioned paper end position of above-mentioned detecting unit shortens in above-mentioned paper conveyance direction, can realize the densification of above-mentioned image processing system, and can shorten image and form the required time.

And, in image processing system of the present invention, it is characterized in that: carry out being formed on before the detection of above-mentioned paper end position the image on the above-mentioned image-carrier at above-mentioned detecting unit, consider the transmission deviation of the above-mentioned paper that transmits to above-mentioned transfer printing point and be set to the bigger size of surplus.

Form device according to this inventive images, even do not carry out the detection of the above-mentioned paper end position of above-mentioned detecting unit, image on the above-mentioned image-carrier of large-size that also can be by surplus is arranged prevents that effectively above-mentioned paper from transmitting the missing image that deviation causes, preferable image comparatively can be transferred on the paper.

And, in image processing system of the present invention, it is characterized in that: above-mentioned detecting unit is arranged on downstream one side of positioning unit, above-mentioned positioning unit carries out above-mentioned paper end position at this detecting unit and corrects the transmission inclination of above-mentioned paper before detecting, and adjusts image on the above-mentioned image-carrier with respect to the position of above-mentioned paper.

Form device according to this inventive images, be positioned at downstream one side of above-mentioned positioning unit by making above-mentioned detecting unit, the inclination transmission of the above-mentioned paper that transmits to above-mentioned transfer printing point is corrected by above-mentioned positioning unit.By detecting the end position of above-mentioned paper under the state that is transmitted rightly at above-mentioned paper, the end position that can high Precision Detection go out above-mentioned paper, and above-mentioned detecting unit carry out above-mentioned paper end position detect before the big I of the image that surplus is arranged on the above-mentioned image-carrier of formation diminish as much as possible.Therefore, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: from the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking, above-mentioned detecting unit carries out above-mentioned paper end position and detect the picture size that forms in the past on above-mentioned image-carrier, be set according to predetermined data, and, above-mentioned detecting unit carries out above-mentioned paper end position and detects picture size on the later above-mentioned image-carrier, changes according to the testing result of above-mentioned detecting unit.

Form device according to this inventive images, from the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking.The detection of the above-mentioned paper end position that above-mentioned detecting unit carries out can be carried out in the stage early, the testing result of the above-mentioned paper end position after the detection of carrying out according to above-mentioned detecting unit, and the picture size on the above-mentioned image-carrier is changed rapidly.So, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: have a plurality of image-carriers, be configured in side by side on the direction of transfer that carries the paper carrier that transmits above-mentioned paper, above-mentioned paper is formed image respectively, picture size on the above-mentioned image-carrier that is positioned at the upstream of above-mentioned paper conveyance direction one side in above-mentioned each image-carrier, image after above-mentioned detecting unit carries out above-mentioned paper end position detection forms and is changed midway, and, the testing result of the above-mentioned paper end position that the picture size on remaining above-mentioned image-carrier is carried out according to above-mentioned detecting unit was changed before image forms.

Form device according to this inventive images, in having the tandem type image processing system of a plurality of image-carriers, because the position difference of above-mentioned each image-carrier, therefore the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit, it is different with the sequential of formation image on each above-mentioned image-carrier to change the sequential of the size of images on the above-mentioned image-carrier.At the above-mentioned image-carrier that is arranged in the upstream of above-mentioned paper conveyance direction one side, image after the above-mentioned paper end position that above-mentioned detecting unit carries out detects forms midway, size of images is changed, and in remaining above-mentioned image-carrier, forming on each above-mentioned image-carrier before the image, forming the image of size (making the little size of surplus as far as possible) of the testing result of the above-mentioned paper end position that carries out based on above-mentioned detecting unit.So, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: in any one in above-mentioned each image-carrier, has correction data, be used to proofread and correct the image formation position deviation of remaining above-mentioned image-carrier with respect to this above-mentioned image-carrier, the picture size that on each above-mentioned image-carrier, forms, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit, and above-mentioned correction data set.

Form device according to this inventive images, the testing result of the end position of the above-mentioned paper that the above-mentioned detecting unit that is provided with according to correction data with near the above-mentioned image-carrier that is positioned at the upstream of above-mentioned paper conveyance direction one side is detected, set the image range that forms on each above-mentioned image-carrier, above-mentioned correction data is used for proofreading and correct at the image processing system of tandem type and image as the image-carrier of benchmark and forms position deviation, the offset of ascending the throne is poor, the position deviation of writing unit, the deviation that has other image-carriers that the transmission of transfer belt tilts, tilt etc.So, even have deviation, inclination etc. in other the above-mentioned image-carriers except that the above-mentioned image-carrier of benchmark, carry out the detection of above-mentioned paper end position at above-mentioned detecting unit after, for the above-mentioned paper that on the transfer printing carrier, transmits, also can on each above-mentioned image-carrier, form the image of lucky scope.

And, in image processing system of the present invention, it is characterized in that: on above-mentioned image-carrier, form the position or the multiplying power of image, according to the testing result of the above-mentioned paper end position that carries out with above-mentioned detection device irrelevant, predetermined data set.

Form device according to this inventive images, will be when above-mentioned paper being carried out the change midway of image formation in the scope of carrying out image formation on the above-mentioned image-carrier, after change of location, multiplying power, image loses continuity, perhaps image takes place crooked, if but the position of image, multiplying power were set according to predetermined data, then could carry out preferable image and form.

And, in image processing system of the present invention, it is characterized in that: selectively be provided with the non-flanged image and form pattern, be used for above-mentioned paper is formed the non-flanged image, when this non-flanged image formation pattern is selected, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit is carried out image and is formed.

Form device according to this inventive images, when forming the non-flanged image,, just can carry out the control of the image formation scope of the above-mentioned paper end position testing result of carrying out based on above-mentioned detecting unit only by selecting no image to form pattern.So, can prevent the missing image on the above-mentioned paper, and can suppress not to be transferred to above-mentioned paper and the amount of the developer of the waste that is recovered, the cycle till the developer recovery container that can prolong cleaning unit overflows.

And, in image processing system of the present invention, it is characterized in that: when the picture size on the above-mentioned image-carrier than when the size of the above-mentioned paper of above-mentioned transfer printing point transmission is big, the detection of the above-mentioned paper end position that is undertaken by above-mentioned detecting unit, further detect the crooked of above-mentioned paper, above-mentioned paper after it midway, the end position of the above-mentioned paper that the picture size on the above-mentioned image-carrier is carried out according to above-mentioned detecting unit and the testing result of askew status change, image on the above-mentioned image-carrier that is changed according to this size, the image to above-mentioned paper after proceeding forms.

Form device according to this inventive images, before above-mentioned detecting unit carries out the detection of above-mentioned paper end position and askew status, for the above-mentioned paper that sends to above-mentioned transfer printing point, transfer printing is than the image on the big above-mentioned image-carrier of above-mentioned antiquarian, when end position that detects above-mentioned paper by above-mentioned detecting unit and askew status, according to this testing result, change is transferred to the picture size on the above-mentioned paper above-mentioned image-carrier midway.That is, before the testing result that obtains above-mentioned paper end position that above-mentioned detecting unit carries out and askew status and after the detection, the picture size that forms on the above-mentioned image-carrier is changed.Therefore, carry out at above-mentioned detecting unit before the end position and askew status detection of above-mentioned paper, even do not obtain the testing result of above-mentioned paper end position and askew status, also can be by than the image on the big above-mentioned image-carrier of above-mentioned antiquarian, the good image that the missing image that above-mentioned paper sheet askew causes can not take place is transferred on the above-mentioned paper.On the other hand, after above-mentioned detecting unit carries out the detection of the end position of above-mentioned paper and askew status, even above-mentioned image-carrier epigraph determining dimensions is not in time carried out, also can change picture size on the above-mentioned image-carrier according to the testing result of the end position of above-mentioned paper and askew status based on the size of above-mentioned paper end position.So, can reduce the developer that is not transferred to above-mentioned paper and is recovered by cleaning unit as much as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in the incorporate cleaning unit of the container of the developer of accommodating recovery, the developer that can suppress to reclaim is the developer deflection of more storage partly, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And, by carry out on above-mentioned image-carrier, forming image before the detection of above-mentioned paper end position and askew status at above-mentioned detecting unit, above-mentioned detecting unit is provided with near above-mentioned transfer printing point.So, the transfer path that begins the above-mentioned paper till the above-mentioned transfer printing point from the check point of the above-mentioned paper end position of above-mentioned detecting unit shortens in above-mentioned paper conveyance direction, can realize the densification of above-mentioned image processing system, and can shorten image and form the required time.

And, in image processing system of the present invention, it is characterized in that: above-mentioned detecting unit carries out the image that above-mentioned paper end position and askew status form before detecting on above-mentioned image-carrier, considers the bigger size that is set to surplus to the transmission deviation of the above-mentioned paper of above-mentioned transfer printing point transmission.

Form device according to this inventive images, even do not obtain the above-mentioned paper end position of above-mentioned detecting unit and the testing result of askew status, image on the above-mentioned image-carrier of large-size that also can be by surplus is arranged prevents that effectively above-mentioned paper from passing the crooked missing image that causes, preferable image comparatively can be transferred on the paper.

And, form in the device in this inventive images, it is characterized in that: above-mentioned detecting unit be arranged on than positioning unit by under above-mentioned paper conveyance direction downstream one side, above-mentioned positioning unit be used for this detecting unit carry out above-mentioned paper end position and askew status detect before image on the above-mentioned image-carrier of adjustment with respect to the position of above-mentioned paper.

Form device according to this inventive images, be positioned at downstream one side of the above-mentioned paper conveyance direction of above-mentioned positioning unit, corrected by above-mentioned positioning unit to the crooked transmission of the above-mentioned paper of above-mentioned transfer printing point transmission by making above-mentioned detecting unit.By under the crooked state of being corrected of above-mentioned paper, detecting the end position and the askew status of above-mentioned paper, can high Precision Detection go out the end position and the askew status of above-mentioned paper.And the big I of the image that surplus is arranged on the above-mentioned image-carrier that carries out forming before above-mentioned paper end position and the askew status detection at above-mentioned detecting unit diminishes as much as possible.Therefore, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: from the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking, the picture size that above-mentioned detecting unit carries out forming on above-mentioned image-carrier before above-mentioned paper end position and the askew status detection is set according to predetermined data, and, above-mentioned detecting unit carries out above-mentioned paper end position and askew status detects the picture size that forms on the later above-mentioned image-carrier, changes according to the above-mentioned paper end position of above-mentioned detecting unit and the testing result of askew status.

Form device according to this inventive images, from the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking.The above-mentioned paper end position that above-mentioned detecting unit carries out and the detection of askew status can be carried out in the stage early.Afterwards, the end position of the above-mentioned paper that carries out according to above-mentioned detecting unit and the testing result of askew status, the picture size on the above-mentioned image-carrier is changed rapidly.So, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: from the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking, the picture size that forms on the above-mentioned image-carrier is set according to the testing result of the above-mentioned paper end position that above-mentioned detecting unit carries out, when detecting the askew status of above-mentioned paper by above-mentioned detecting unit, the picture size that forms on above-mentioned image-carrier after this detection changes according to the testing result of the askew status of above-mentioned paper.

Form device according to this inventive images, owing to need when detecting the askew status of above-mentioned paper, transmit above-mentioned paper to a certain extent and carry out the detection of the end position of above-mentioned detecting unit, therefore the askew status that detects above-mentioned paper needs the time, time after the beginning sequential that forms than image is leaned on, detect the askew status of above-mentioned paper.When detecting the askew status of above-mentioned paper, the askew status of the picture size on the above-mentioned image-carrier afterwards according to above-mentioned paper promptly can be changed, and can reduce the amount of the developer of the waste that is not transferred to above-mentioned paper and is recovered.

And, in image processing system of the present invention, it is characterized in that: have a plurality of image-carriers, be configured in side by side on the direction of transfer that carries the paper carrier that transmits above-mentioned paper, above-mentioned paper is formed image respectively, picture size on the above-mentioned image-carrier that is positioned at the upstream of above-mentioned paper conveyance direction one side in above-mentioned each image-carrier, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status, forming the beginning back at image is changed, and, the above-mentioned paper end position that picture size on remaining above-mentioned image-carrier is carried out according to above-mentioned detecting unit and the testing result of askew status are changed before image forms beginning.

Form device according to this inventive images, in having the tandem type image processing system of a plurality of image-carriers, because the position difference of above-mentioned each image-carrier, therefore the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status, it is different with the sequential of formation image on each above-mentioned image-carrier to change the sequential of the size of images on the above-mentioned image-carrier.Therefore, at the above-mentioned image-carrier that is arranged in the upstream of above-mentioned paper conveyance direction one side, image in the testing result that has obtained above-mentioned paper end position that above-mentioned detecting unit carries out and askew status forms beginning back (image forms midway), size of images is changed, and in remaining above-mentioned image-carrier, beginning to form on each above-mentioned image-carrier before the image, forming the image of size (making the little size of surplus as far as possible) of the testing result of the above-mentioned paper end position that carries out based on above-mentioned detecting unit and askew status.So, can make the quantitative change of developer of the waste that is not transferred to above-mentioned paper and is recovered little, and the cycle of the developer recovery container that can prolong cleaning unit till overflowing.

And, in image processing system of the present invention, it is characterized in that: in any one in above-mentioned each image-carrier, has correction data, be used to proofread and correct remaining above-mentioned image-carrier and form position deviation with respect to the image of this above-mentioned image-carrier, the above-mentioned paper end position that the size of images that forms on each above-mentioned image-carrier is carried out according to above-mentioned detecting unit and the testing result of askew status, and above-mentioned correction data set.

Form device according to this inventive images, the end position of the above-mentioned paper that the above-mentioned detecting unit that is provided with according to correction data with near the above-mentioned image-carrier that is positioned at the upstream of above-mentioned paper conveyance direction one side is detected and the testing result of askew status, set the picture size (scope) that forms on each above-mentioned image-carrier, above-mentioned correction data is used for proofreading and correct at the image processing system of tandem type and image as the image-carrier of benchmark and forms position deviation, the offset of ascending the throne is poor, the position deviation of writing unit, the deviation that has other image-carriers that the transmission of transfer belt tilts, tilt etc.So, even have deviation, inclination etc. in other the above-mentioned image-carriers except that the above-mentioned image-carrier of benchmark, after the above-mentioned detecting unit of acquisition carries out the testing result of above-mentioned paper end position and askew status, for the above-mentioned paper that on the transfer printing carrier, transmits, also can on each above-mentioned image-carrier, form the image of lucky scope.

And, in image processing system of the present invention, it is characterized in that: on above-mentioned image-carrier, form the position or the multiplying power of image, according to the testing result of above-mentioned paper end position that carries out with above-mentioned detection device and askew status irrelevant, predetermined data set.

Form device according to this inventive images, will be when above-mentioned paper being carried out the change midway of image formation in the scope of carrying out image formation on the above-mentioned image-carrier, after change of location, multiplying power, image loses continuity, perhaps image takes place crooked, if but the position of image, multiplying power were set according to predetermined data, then could carry out preferable image and form.

And, in the image processing system of the present invention, it is characterized in that: can select the non-flanged image to form pattern, be used for above-mentioned paper is formed the non-flanged image, when this non-flanged image formation pattern is selected, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status are carried out image and are formed.

Form device according to this inventive images, when forming the non-flanged image,, just can carry out the control of image formation scope of the testing result of the above-mentioned paper end position that carries out based on above-mentioned detecting unit and askew status only by selecting no image to form pattern.So, can prevent the missing image on the above-mentioned paper, and can suppress not to be transferred to above-mentioned paper and the amount of the developer of the waste that is recovered, the cycle till the developer recovery container that can prolong cleaning unit overflows.

Description of drawings

The synoptic diagram of the summary structure of the image processing system of electrofax mode that Fig. 1 is the utilization that relates to of expression first embodiment of the invention.

Fig. 2 is the synoptic diagram of first and second photosensitive drums peripheral structure of expression.

Fig. 3 is the planimetric map from top observation line sensor periphery.

Fig. 4 is the block diagram of the structure of the presentation video image formation system that forms device.

Fig. 5 is the key diagram that is used to illustrate the image forming area of the image that forms on first photosensitive drums.

Fig. 6 is the key diagram that is used to illustrate the image forming area of the image that forms on first and second photosensitive drums.

Fig. 7 is used to illustrate that line sensor detects the key diagram of the image forming area of the image on first photosensitive drums that is changed front and back.

Fig. 8 is used to illustrate that line sensor detects the key diagram of the image forming area of the image on second photosensitive drums that is changed front and back.

Fig. 9 is the process flow diagram of expression based on the change step of the image forming area of the electrostatic latent image of the testing result of line sensor.

Figure 10 is the disconnection of the sequential of representing to write electrostatic latent image respectively on each photosensitive drums, the registration roller clutch coupling detection sequential that connects sequential, line sensor, and the sequential chart of the detection sequential of alignment sensor.

The synoptic diagram of the structure of first and second photosensitive drums periphery of the image processing system of electrofax mode that Figure 11 is the utilization that relates to of expression second embodiment of the invention.

Figure 12 be used for the declare record paper askew status, from the observed planimetric map in transfer printing travelling belt top.

Figure 13 is the block diagram of the structure of the presentation video image formation system that forms device.

Figure 14 is the key diagram that is used to illustrate the image forming area of the image that forms on first photosensitive drums and second photosensitive drums.

Figure 15 is used to illustrate that line sensor detects the key diagram of the image forming area of the image on first photosensitive drums that is changed front and back.

Figure 16 is used to illustrate that line sensor detects the key diagram of the image forming area of the image on second photosensitive drums that is changed front and back.

Figure 17 is used to illustrate that line sensor detects the key diagram of the image forming area of the image on the 3rd and the 4th photosensitive drums that is changed front and back.

Figure 18 is the process flow diagram of expression based on the change step of the image forming area of the electrostatic latent image of the testing result of line sensor.

Figure 19 is the disconnection of the sequential of representing to write electrostatic latent image respectively on each photosensitive drums, the registration roller clutch coupling detection sequential that connects sequential, line sensor, and the sequential chart of the detection sequential of alignment sensor.

The process flow diagram based on the change step of the image forming area of the electrostatic latent image of the testing result of line sensor of the image processing system of electrofax mode that Figure 20 is the utilization that relates to of expression third embodiment of the invention.

Figure 21 is the key diagram of the image forming area of the image on first photosensitive drums that is changed before and after the detection that is used to illustrate under second check point that line sensor carries out.

The synoptic diagram of the summary structure of the digital copier of the monochromatic mode of electrofax mode that Figure 22 is the utilization that relates to of expression four embodiment of the invention.

Figure 23 be other variation relate to, from the planimetric map of top observation line sensor periphery.

Figure 24 be other variation relate to, from the planimetric map of top observation line sensor periphery.

Figure 25 is used to illustrate that the toner that blocks the cleaning device periphery that conventional example relates to reclaims the key diagram of state.

Embodiment

Below with reference to the accompanying drawings embodiments of the present invention are described.

(first embodiment)

Fig. 1 represents the major part of the image processing system of the electrofax mode that first embodiment of the invention relates to, and in this image processing system X, is provided with transfer printing conveyer mechanism 1.This transfer printing conveyer mechanism 1 has: be supported for the driven roller 11 that can rotate freely in a side (being the left side among Fig. 1); Be supported for the driven voller 12 that can rotate freely at opposite side (being the right side among Fig. 1); Be erected between this two roller 11,12, drive along the arrow Z direction shown in Fig. 1, as the ring-type transfer printing travelling belt 13 of paper carrier, by making recording paper P Electrostatic Absorption as paper on the surface of this transfer printing travelling belt 13, make the recording paper P that provides by registration roller 10,10 be sent to a side (downstream one side) from opposite side (upstream one side) as positioning unit.Above-mentioned registration roller the 10, the 10th temporarily is kept at the device of the recording paper P that transmits among the paper transport path S.And,, have the function of opening P corresponding to the rotation of each photosensitive drums 3a-3d with good sequential transfer sheet in order to make multiple well being transferred on the recording paper P of toner image on each photosensitive drums 3a-3d.That is, registration roller 10,10 is set according to the detection signal of alignment sensor 10a output, and transfer sheet is opened P, makes that the top of the print range among top and the recording paper P of the toner image on each photosensitive drums 3a-3d is corresponding.At this moment, transfer printing travelling belt 13 utilizes the film about thick 100 μ m-150 μ m to form ring-type.

Downstream one side (being the left side among Fig. 1) at the recording paper P of above-mentioned transfer printing conveyer mechanism 1 direction of transfer is provided with fixing device 2, by this fixing device 2, makes recording paper P go up the toner image photographic fixing of transfer printing formation on recording paper P.Fixing device 2 has warm-up mill 21, backer roll 22 up and down, makes at transfer printing conveyer mechanism 1 (transfer printing travelling belt 13) and goes up the pros and cons of the recording paper P that transmits by the roll gap between warm-up mill 21 and the backer roll 22.

And, above transfer printing conveyer mechanism 1, first image form station S1, second image form station S2, the 3rd image form station S3, and the 4th image form station S4 respectively near transfer printing travelling belt 13, from recording paper transfer path upstream one side (be the right side Fig. 1) beginning spacing parallel arranging setting successively to be scheduled to.At this moment, the recording paper P on the transfer printing travelling belt 13 be sent to successively first image form station S1, second image form station S2, the 3rd image form station S3, and the 4th image form station S4.

Each image forms station S1-S4 and is essentially identical structure, have on arrow F direction shown in Figure 1 rotation respectively, as first to fourth photosensitive drums 3a-3d of image-carrier.At the periphery of this each photosensitive drums 3a-3d, be provided with successively: make the first to fourth charged device 4a-4d that each photosensitive drums 3a-3d is charged, form electrostatic latent image on the outer peripheral face of each photosensitive drums 3a-3d along the sense of rotation (arrow F direction) of each photosensitive drums 3a-3d; The electrostatic latent image that will form on the outer peripheral face of each photosensitive drums 3a-3d develops by toner and is first to fourth developing apparatus 5a-5d of visual image; The toner image (visual image) that on the outer peripheral face of each photosensitive drums 3a-3d, develop be transferred to recording paper P, as first to fourth transfer roll 6a-6d of transfer printing unit; Remove the cleaning device 7a-7d of toner residual on the outer peripheral face of each photosensitive drums 3a-3d.At this moment, cleaning device 7a-7d and container are integrally formed.

And, above each photosensitive drums 3a-3d, be provided with first to fourth exposing unit 8a-8d.This each exposing unit 8a-8d is a writing unit, according to image information, for example by light such as LED, laser image is written on the surface of each charged photosensitive drums 3a-3d.So, on each photosensitive drums 3a-3d, form electrostatic latent image.

First image that is arranged in upstream one side of above-mentioned transfer printing travelling belt 13 direction of transfers forms the first exposing unit 8a of station S1, import the picture element signal corresponding with the black content image of colored original image, form among the second exposing unit 8b of station S2 at next second image, import the corresponding picture element signal of cyan component-part diagram picture with the colored original image, further form among the 3rd exposing unit 8c of station S3 at next the 3rd image, import the corresponding picture element signal of magenta component-part diagram picture with the colored original image, form the 4th exposing unit 8d of station S4 at the 4th image that is arranged in downstream, the corresponding picture element signal of yellow component-part diagram picture of input and colored original image.So, corresponding with the original image information of colour switching electrostatic latent image is formed on the outer peripheral face of each photosensitive drums 3a-3d.

Accommodate the toner of black among the first developing apparatus 5a of first image formation station S1, accommodate the toner of cyan among the second developing apparatus 5b of second image formation station S2, accommodate the toner of magenta among the 3rd developing apparatus 5c of the 3rd image formation station S3, and in the 4th developing apparatus 5d of the 4th image formation station S4, accommodate yellow toner.Electrostatic latent image on each photosensitive drums 3a-3d outer peripheral face is developed by these versicolor toners and is visual image, and so, original image information is reproduced as toner image by versicolor toner.

Form between station S1 and the transfer printing travelling belt 13 at first image, be provided with the charged device (not shown) of recording paper absorption usefulness.The charged device of this recording paper absorption usefulness is the device that makes the surface charging of transfer printing travelling belt 13, the recording paper P that will be provided by the paper feed tray 19 of the bottom that is arranged on image processing system X is adsorbed onto on the transfer printing travelling belt 13 effectively, begin to form between the S4 of station thereby form station S1, recording paper P bias free ground is transmitted to the 4th image at first image.

And, undertaken by transfer roll 6a-6d to the transfer printing of the toner image of recording paper P with reverse side one side contacts of transfer printing travelling belt 13 from each photosensitive drums 3a-3d.Each transfer roll 6a-6d has applied the transfer bias (with the high pressure of (+) of charged polarity (-) opposite polarity of toner) of the high pressure that is used for the transfer printing toner image.Each transfer roll 6a-6d is substrate with metal (for example stainless steel) axle of diameter 8-10mm, the resilient material of its surface coverage electric conductivity (for example EPDM, foaming urethane etc.).By the resilient material of this electric conductivity, can apply uniform high pressure to recording paper P.In addition, in this first embodiment, used transfer roll 6a-6d, also can use brush etc. as the transfer printing electrode.

And, be the factor of polluting recording paper P reverse side by being attached to toner on the transfer printing travelling belt 13 with contacting of each photosensitive drums 3a-3d, therefore remove, reclaim by transfer belt cleaning unit 13a.Be provided with the cleaning doctor (not shown) that contacts with transfer printing travelling belt 13 among the transfer belt cleaning unit 13a, the transfer printing travelling belt 13 of the position of cleaning doctor contact (below between the 3rd image formation station S3 and the 4th an image formation station S4) side is from the negative supported by transfer printing travelling belt driven voller 13b.And, below first image formation station S1, also be provided with transfer printing travelling belt driven voller 13c, by this transfer printing travelling belt driven voller 13c, transfer printing travelling belt 13 side from the negative is supported.

Paper feed tray 19 is to be used to store the pallet that image forms employed recording paper P, is arranged on the downside of the image forming part of this image processing system X.And, the row's paper disc 17 that is arranged on this image processing system X top be used for will finish the pallet of the recording paper P placed face down that forms of image, the row's paper disc 18 that is arranged on this image processing system X sidepiece is to be used for finishing the pallet that recording paper that image forms faces up and places.

And, in image processing system X, be provided with the recording paper P that makes in the paper feed tray 19 paper transport path S via the S word shape of transfer printing conveyer mechanism 1, fixing device 2 row's of being sent to paper discs 17.Further, begin to dispose the paper transport path S till the paper disc 18 to row's paper disc 17 and row from paper feed tray 19: pick-up roller 19a, registration roller 10, direction of transfer switch the connecting gear portion 300 that guides 34, transfer sheet are opened the transfer roller 35 etc. of P.

Transfer roller 35 is made of the small-sized roller that is used to promote, auxiliary record paper P transmits, and is provided with a plurality of along paper transport path S.

Direction of transfer switching guides 34 can be rotatably set on the side lid Xa of image processing system X, by being the state shown in the dotted line from the state transformation shown in the solid line, the recording paper of separation midway P at paper transport path S makes recording paper P output to row's paper disc 18 of image processing system X sidepiece.When direction of transfer switched guides 34 and is transformed to state shown in the solid line, recording paper P switched row's paper disc 17 that transport unit Sa (part of paper transport path S) between the guides 34 outputs to top by being formed on fixing device 2 and side lid Xa and direction of transfer.

And, as characteristic of the present invention, as shown in Figure 2, the toner image (image) that forms on the first photosensitive drums 3a than S1 that above-mentioned first image formation is stood is transferred to upstream one side (recording paper P is adsorbed onto transfer printing travelling belt 13 position before) of the more close recording paper direction of transfer of transfer printing point G of the recording paper P on the above-mentioned transfer printing travelling belt 13, be provided with line sensor 51, be used to detect the marginal position (end position) of the recording paper P that transmits to transfer printing point G as detecting unit.As shown in Figure 3, this line sensor 51 is arranged on the below with the side (being downside among Fig. 3) of the direction of transfer vertical direction of recording paper P.And as shown in Figure 2, line sensor 51 has the relative up lighting unit 52 across paper transport path S, whether is recorded the marginal position that paper P blocks detection record paper P by the irradiates light from lighting unit 52.And, line sensor 51 is arranged on recording paper direction of transfer downstream one side of above-mentioned registration roller 10,10, on-line sensor 51 carries out before the marginal position detection of recording paper P, correct the transmission of recording paper P by registration roller 10,10 and tilt, and adjust toner image (image) on each photosensitive drums 3a-3d with respect to the position of recording paper P.In this case, because the irradiates light that penetrates from lighting unit 52 is directly inputted to line sensor 51, therefore can set the luminous intensity of lighting unit 52 lower, line sensor 51 can be disposed to such an extent that also can not utilize lens unit can detect the marginal position of recording paper P accurately near recording paper P.And, as line sensor 51, the line image sensing head that the small scanning of use market sale is used.Therefore has the performance about resolution 200-300dpi, pixel count 864-1216, read range 104mm, as shown in Figure 3, even for example the full-size with recording paper P is made as A3 (shown in the solid line of Fig. 3), and when making minimum dimension be postcard (shown in two dot-and-dash lines of Fig. 3), also can cover the recording paper P from full-size to the minimum dimension.In addition, in Fig. 3, the maximal value of correcting a deviation (among Fig. 3 shown in the dot-and-dash line), and the maximal value of correcting a deviation of opposite side (being upside among Fig. 3) (among Fig. 3 shown in the dotted line) of having corrected the side (being downside among Fig. 3) of the recording paper P when transmitting by registration roller 10,10 have been shown respectively.

And, as shown in Figure 2, the check point R of the marginal position of the recording paper P that carries out from line sensor 51 begins distance L 1 till the transfer printing point G and sets to such an extent that write the distance L 0 of a Q till the above-mentioned transfer printing point G less than what undertaken by the first exposing unit 8a from the first photosensitive drums 3a that forms station S1 to first image that electrostatic latent image (image) writes.

(structure of image formation system)

Fig. 4 is the block diagram of the structure of the presentation video image formation system that forms device X.

In this Fig. 4, image formation system has: image data input unit 401, the image processing part 403 with storage part 402, light write section 404, operating portion 405, data store 406, operational part 407, line sensor 51, and alignment sensor 10a.This image formation system is by control part 40 control various pieces.In addition, this image formation system further has: above-mentioned connecting gear portion 300, charged device 4a-4d, developing apparatus 5a-5d, transfer roll 6a-6d, and fixing device 2.

And, be provided with change-over switch (not shown) in the aforesaid operations portion 405, switch to the non-flanged image when being used for and form pattern recording paper P formation non-flanged image.When switching to the non-flanged image by this change-over switch and form pattern, be written to first image than the big electrostatic latent image of size of the recording paper P that detects marginal position by line sensor 51 and form on the first photosensitive drums 3a of station S1.Line sensor 51 carries out after the marginal position detection of recording paper P, for the size of the electrostatic latent image on the first photosensitive drums 3a of the transfer printing midway of this recording paper P, changed according to the testing result (testing result of the marginal position of recording paper P) of above-mentioned line sensor 51.Electrostatic latent image (toner image) on the first photosensitive drums 3a that is changed according to this size, image to this recording paper P of proceeding after it forms.

Particularly, as shown in Figure 5, the recording paper P of horizontal wide W0 (left and right directions vertical with the direction of transfer of recording paper wide) is transmitted, when arriving registration roller 10,10, the transmission of the recording paper P among the paper transport path S is tilted by being corrected with the coupling of the apical position of registration roller 10,10.By correct a deviation (the solid line shown in Figure 5 and deviation between the dotted line) of the recording paper P under this rectification, try to achieve the effective wide W1 on the direction vertical with the direction of transfer of recording paper P.As shown in Figure 6, add margin value W2, W2 about 1mm respectively in the both sides of this effective wide W1, determine the wide W4 (W1+W2 * 2) of the horizontal image forming area vertical with the recording paper direction of transfer.Electrostatic latent image that will this horizontal wide W4 of image forming area is written on the first photosensitive drums 3a that first image forms station S1 by the first exposing unit 8a after, develop by the first developing apparatus 5a, form the toner image of the horizontal image forming area wide W4 bigger than the horizontal wide W0 of recording paper P.At this moment, the set value of horizontal wide W0 by selected recording paper P, and the wide W4 of horizontal image forming area of the electrostatic latent image of input, the position and the multiplying power of the image on the setting recording paper P, also automatically or the structure of manually setting by the TipWizard of image processing system X.

The wide W4 of horizontal image forming area that this first image forms the toner image (electrostatic latent image) on the first photosensitive drums 3a of station S1 is in the horizontal scope vertical with the recording paper direction of transfer of initial setting, the size according to each recording paper P, kind and store the value of data store 40 in advance into.As shown in Figure 7, W5 is the margin value that comprises the direction of transfer (vertically) of the initial change of the recording paper P that registration roller 10,10 causes and surplus, and this margin value W5 also stores data store 406 in advance according to size, the kind of each recording paper P.And W7 is the set value of the length of recording paper direction of transfer, and the set value W7 of the length of this recording paper P also stores in the data store 406 in advance according to size, the kind of each recording paper P.And, the set value W7 of margin value W5 by the recording paper direction of transfer and the length of recording paper P determines that first image forms the length of image forming area longitudinally W9 (W7+W5 * 2) on the first photosensitive drums 3a of S1 in the station, parallel with the recording paper direction of transfer of toner image (electrostatic latent image).In addition, these values are calculated by predetermined value, but the set value W7 of the length of the margin value W5 of recording paper direction of transfer, recording paper P also can store data store 406 in advance according to size, the kind of each recording paper P.

And the testing result of the marginal position of the recording paper P that carries out according to above-mentioned line sensor 51 obtains the actual horizontal stroke wide W01 vertical with the direction of transfer of recording paper P.Calculate the wide W6 of horizontal image forming area (W01+W3 * 2) that adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 to the left and right sides of the wide W01 of actual horizontal stroke of this acquisition respectively by operational part 407.On-line sensor 51 carries out before the marginal position detection of recording paper P, the wide W4 of horizontal image forming area of the electrostatic latent image that will on the first photosensitive drums 3a, write (by the toner image of first developing apparatus 5a development) by the first exposing unit 8a, change to the landscape images of electrostatic latent image that forms the marginal position testing result of the recording paper P that line sensor 51 midway carries out based on the image on the first photosensitive drums 3a and form regional wide W6, and on the first photosensitive drums 3a, continue to write electrostatic latent image by the first exposing unit 8a.Promptly, before the marginal position of the recording paper P that on-line sensor 51 carries out detects and afterwards, the landscape images that the first photosensitive drums 3a is gone up the electrostatic latent image that writes by the first exposing unit 8a (toner image of developing by the first developing apparatus 5a) forms wide the changing to from W4 in zone and reduces to W6.

And, second to the 4th image that forms the close recording paper direction of transfer downstream of S1, station one side than first image forms among the S2-S4 of station, write electrostatic latent image (image) by what exposing unit 8b-8d carried out to photosensitive drums 3b-3d, the marginal position of the recording paper P that on-line sensor 51 carries out carries out after detecting, as shown in Figure 8, landscape images on these photosensitive drums 3b-3d forms regional wide W61 and reaches image forming area length W91 longitudinally, the testing result of the marginal position of the recording paper P that carries out according to line sensor 51, change in advance before carrying out writing of electrostatic latent image by exposing unit 8b-8d.

Particularly, the set value W71 that second to the 4th image forms the longitudinal length of the toner image (electrostatic latent image) on the photosensitive drums 3b-3d of station S2-S4 is that the top of the recording paper P that carries out according to line sensor 51 and the testing result of rear end are calculated the value of trying to achieve, both sides, front and back at the set value W71 of this longitudinal length add margin value W8 (for example about 1mm) respectively, determine to be written to vertical image forming area length W91 (W71+W8 * 2) of the electrostatic latent image on the photosensitive drums 3b-3d.On the other hand, the set value W01 that second to the 4th image forms the lateral length of the toner image (electrostatic latent image) on the photosensitive drums 3b-3d of station S2-S4 is that the top of the recording paper P that carries out according to line sensor 51 and the testing result of rear end are calculated the value of trying to achieve, the set value W01 left and right sides in this horizontal length adds margin value W3 respectively, determines that the landscape images that is written to the electrostatic latent image on the photosensitive drums 3b-3d forms zone length W61 (W01+W3 * 2).

(flow process of the image forming area change step of electrostatic latent image)

Then, describe with reference to the process flow diagram of Fig. 9 image forming area change step the electrostatic latent image of the testing result of the marginal position of the recording paper P that carries out based on line sensor 51.

At first, in the step ST1 of the process flow diagram of Fig. 9, the start button of press operating part 405 after the beginning image forms action, in step ST2, judges whether that having switched to the non-flanged image by change-over switch forms pattern.When being judged as of this step ST2 do not switch to the non-flanged image and form the "No" of pattern, advance to step ST12, finish common have edge image to form after, advance to following step ST10.

When being judged as among the step ST2 switches to the "Yes" of non-flanged image formation pattern, in step ST3, dimension information by the recording paper P that uses, according to the data that are stored in data store 406, set respectively: the landscape images of the electrostatic latent image on the first photosensitive drums 3a of first image formation station S1 forms regional wide W4; The margin value W5 that comprises the electrostatic latent image of the initial change of the recording paper P that registration roller 10,10 causes and margin range; And vertical set value W7 of the recording paper direction of transfer of electrostatic latent image.

Then, in step ST4, form at first image on the first photosensitive drums 3a of station S1,, form regional wide W4 with landscape images and begin writing of electrostatic latent image by the first exposing unit 8a.

Then, in step ST5, detect the transverse edge position parallel (about on one side side position) by line sensor 51, obtain the horizontal reality horizontal wide W01 vertical with the direction of transfer of recording paper P according to this testing result with the direction of transfer of recording paper P.Afterwards in step ST6, the landscape images that the left and right sides of calculating the wide W01 of actual horizontal stroke that obtains by operational part 407 in above-mentioned steps ST5 adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 respectively forms regional wide W6, on-line sensor 51 carries out before the marginal position detection of recording paper P, the landscape images of the electrostatic latent image that will write by the first exposing unit 8a on the first photosensitive drums 3a (by the toner image of first developing apparatus 5a development) forms regional wide W4, changes to based on the image on the first photosensitive drums 3a to form midway, the landscape images of the electrostatic latent image of the marginal position testing result of the recording paper P that line sensor 51 carries out forms regional wide W6.

Afterwards, in step ST7, form writing of electrostatic latent image (image) among the S2-S4 of station, that carry out to photosensitive drums 3b-3d by exposing unit 8b-8d for form second to the 4th image of station S1 than first image near recording paper direction of transfer downstream one side, the marginal position testing result of the recording paper P that carries out according to line sensor 51, as shown in Figure 8, set landscape images on these photosensitive drums 3b-3d and form regional wide W61 and margin value W8 longitudinally, beginning is carried out the writing of electrostatic latent image by exposing unit 8a-8d to photosensitive drums 3b-3d.

Afterwards in step ST8, second to the 4th image is formed the set value W71 of the longitudinal length of the electrostatic latent image (toner image) on the photosensitive drums 3b-3d of station S2-S4, the top of the recording paper P that carries out according to line sensor 51 and the testing result of rear end are calculated, add margin value W8 (for example about 1mm) in the both sides, front and back of the set value W71 of length longitudinally to this respectively, determine to be written to vertical image forming area length W91 (W71+W8 * 2) of the electrostatic latent image on the second photosensitive drums 3b that second image forms station S2.Afterwards, in step ST9, form regional wide W61 and vertical image forming area length W91 according to the landscape images that forms on the second photosensitive drums 3b that sets among the S2 of station at above-mentioned second image, on photosensitive drums 3c, the 3d of the 3rd and the 4th image formation station S3, S4, write electrostatic latent image by exposing unit 8c, 8d.

Afterwards, in step ST10, develop by developing apparatus 5a-5d and be toner image being written to electrostatic latent image on the photosensitive drums 3a-3d that each image forms station S1-S4, behind the recording paper P that is transferred to successively on the transfer printing travelling belt 13, in step ST11, the image of the recording paper P after the above-mentioned transfer printing is undertaken on photographic fixing and the row's of the outputing to paper disc 17,18 by fixing device.

(electrostatic latent image write sequential chart)

Then, with reference to the sequential chart of Figure 10 each image is formed detection sequential, and the alignment sensor 10a detection sequential of carrying out of marginal position of disconnecting sequential, recording paper P that line sensor 51 carries out of registration roller clutch coupling of the driving force that writes sequential, disconnecting registration roller 10,10 of the electrostatic latent image on photosensitive drums 3a-3d of station S1-S4.

In the sequential chart of Figure 10, what first image formed station S1 writes electrostatic latent image on the first photosensitive drums 3a, with detection (ON) time that begins of alignment sensor 10a be benchmark, almost begin simultaneously be connected (ON) of the registration roller clutch coupling of T2 after second.The writing of the electrostatic latent image on the first photosensitive drums 3a that forms station S1 from this first image begins T4 after second, promptly, after the detection of on-line sensor 51 marginal position (position, the left and right sides) parallel that carry out (beginning T3 after second) from the detection of alignment sensor 10a with the direction of transfer of recording paper P, before the marginal position of 51 couples of recording paper P of on-line sensor detected, the landscape images that is written to the electrostatic latent image on the first photosensitive drums 3a by the first exposing unit 8a formed regional wide W4, changed to the landscape images of electrostatic latent image of carrying out the testing result of recording paper P marginal position that the first photosensitive drums 3a epigraph forms midway and formed regional wide W6 based on line sensor 51.

And, second to the 4th image form among the S2-S4 of station, write electrostatic latent image (image) by exposing unit 8b-8d to photosensitive drums 3b-3d and be: the electrostatic latent image on the first photosensitive drums 3a that forms station S1 since first image writes the second through T4, and the schedule time carried out successively at interval after the marginal position of the recording paper P that on-line sensor 51 carries out detected.Promptly, the testing result of the marginal position of the recording paper P that carries out according to line sensor 51, landscape images on the photosensitive drums 3b-3d of second to the 4th image formation station S2-S4 forms regional wide W61 and vertical image forming area length W91, carries out being set after changing in advance before electrostatic latent image writes at exposing unit 8b-8d.

In this case, the dotted line that reads sequential of line sensor 51 is represented: beginning (ON) with the detection with alignment sensor 10a is that the registration roller clutch coupling of T1 after second of benchmark is connected (ON) simultaneously, the reading of initial sensor 51.And, the actual time of reading in the recording paper P on-line sensor 51 that the solid line that reads sequential of line sensor 51 is represented to transmit on transfer printing travelling belt 13, in the moment (the front-end edge position probing time that line sensor carries out begins T5 after second) that detects the marginal position of recording paper P rearward end by this line sensor 51, the connection of registration roller clutch coupling is disconnected (OFF).In addition, in this first embodiment, the detection of the recording paper P marginal position that line sensor 51 carries out is carried out continuously till the rear end of the recording paper P to the transfer printing travelling belt 13, but is not limited thereto, and also can be only the part of necessity be detected by line sensor 51.Promptly, also can be according to the size of selected recording paper, only by the top ends of recording paper and the secondary detection at least of rearward end, sequential is passed through by sequential, marginal position (left and right sides end positions), the rear end parallel with direction of transfer in the top that detects recording paper.

And in the tandem type image processing system X as this first embodiment, misalignment becomes problem when forming multicolor image, causes image quality reduction, obtains good image quality for reducing this image quality reduction, carries out color registration (color-match) and proofreaies and correct control.That is, in the data store 406 of image processing system X, storage in advance is used for proofreading and correct with respect to data benchmark photosensitive drums (the first photosensitive drums 3a of for example upstream one side), form position (sequential) to the image of other photosensitive drums 3b-3d.And, according to the picture position that each photosensitive drums 3b-3d of this adjustment of data go up to form, make each photosensitive drums 3b-3d go up the image that forms and deviation can not take place, thereby and control and make it correct overlappingly misalignment can not take place.

Therefore, in the above-described first embodiment, when the change-over switch by operating portion 405 switched to non-flanged image formation pattern, the electrostatic latent image bigger than the size of recording paper P began to be written to first image and forms on the first photosensitive drums 3a of station S1.When detecting the marginal position of recording paper P by line sensor 51, the testing result (testing result of the marginal position of recording paper P) of carrying out according to above-mentioned line sensor 51 changes the size that is transferred to electrostatic latent image on the recording paper P first photosensitive drums 3a midway after it.Image to this recording paper P that electrostatic latent image (toner image) on the first photosensitive drums 3a that is changed according to this size is proceeded after it forms.Particularly, when the recording paper P of the wide W0 of horizontal stroke is transmitted and be positioned roller 10,10 rectification tops, as shown in Figure 5, try to achieve the effective wide W1 of recording paper P by correcting a deviation of the recording paper P under this rectification.As shown in Figure 6, determine that the landscape images that adds the recording paper of margin value W2, W2 about 1mm respectively in these effective wide W1 both sides forms regional wide W4 (W1+W2 * 2), the electrostatic latent image that this landscape images is formed regional wide W4 begins to be written on the first photosensitive drums 3a of first image formation station S1 by the first exposing unit 8a.Testing result when the recording paper P marginal position that carries out according to line sensor 51, when trying to achieve the wide W0 of the actual horizontal stroke of recording paper P, as shown in Figure 7, calculate the landscape images that adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 respectively to the wide W0 of the actual horizontal stroke left and right sides of this acquisition by operational part 407 and form regional wide W6.And, on-line sensor 51 carries out before the marginal position detection of recording paper P, the landscape images of the electrostatic latent image that will write by the first exposing unit 8a on the first photosensitive drums 3a (by the toner image of first developing apparatus 5a development) forms regional wide W4, landscape images testing result, electrostatic latent image that changes to the recording paper P marginal position that carries out based on the formation of the image on first photosensitive drums 3a line sensor 51 midway forms regional wide W6, and continues to write electrostatic latent image by the first exposing unit 8a on the first photosensitive drums 3a.Promptly, before the detection of the recording paper P marginal position that on-line sensor 51 carries out and afterwards, to form regional reductions few for the landscape images that the first photosensitive drums 3a is gone up the electrostatic latent image that writes by the first exposing unit 8a (toner image of developing by the first developing apparatus 5a).Therefore, before on-line sensor 51 detects, even the marginal position of recording paper P does not detect, also can the transmission deviation that can not produce because of recording paper P be caused that the good image of missing image is transferred to recording paper P by than the toner image (electrostatic latent image) on the first big photosensitive drums 3a of the size of recording paper P.On the other hand, after on-line sensor 51 detects, even the first photosensitive drums 3a epigraph determining dimensions is not in time carried out, also can be according to the marginal position testing result of recording paper P, make the first photosensitive drums 3a go up the toner size of images and change to size based on the marginal position of recording paper P.So, can reduce the toner that is not transferred to recording paper P and in cleaning device 7a, reclaims as far as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in the incorporate cleaning unit 7a of the container of the developer of accommodating recovery, the developer that can suppress to reclaim is the developer deflection of more storage partly, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And the rim detection of carrying out recording paper P by on-line sensor 51 was written to electrostatic latent image on the first photoreceptor 3a by first exposing unit in the past, and line sensor 51 is provided with near transfer printing point G.The transmitting range L1 that begins the recording paper P till the transfer printing point G from the check point R of the recording paper P marginal position of line sensor 51 shortens at the direction of transfer of recording paper P, can realize the densification of image processing system X, and can shorten image and form the required time.

And, line sensor 51 is arranged on downstream one side of registration roller 10,10, made before the marginal position of the recording paper P that this line sensor 51 carries out detects, the transmission of recording paper P tilts to be corrected, and therefore the inclination transmission of the recording paper P that transmits to transfer printing point G is corrected by registration roller 10,10.Therefore, under the state that recording paper P is transmitted rightly, detect the marginal position of recording paper P by line sensor 51, can high Precision Detection go out the marginal position of recording paper P, and the size of the image that surplus is arranged on the first photosensitive drums 3a that forms before detecting of the marginal position that can reduce the recording paper P that on-line sensor 51 carries out as much as possible.So, can make the quantitative change of developer of the waste that is not transferred to recording paper P and is recovered few.

And, since with the check point R of line sensor 51 begin distance L 1 till the transfer printing point G set less than to the electrostatic latent image of the first photosensitive drums 3a write the distance L 0 of a Q till the above-mentioned transfer printing point G, so the detection of the marginal position of the recording paper P of line sensor 51 can be carried out than the stage of morning.The testing result of the marginal position of the recording paper P after detecting according to this line sensor 51, the size that the first photosensitive drums 3a goes up electrostatic latent image is promptly changed, and can more efficiently reduce the amount of the toner of the waste that is not transferred to recording paper P and is recovered.

And, first image in the upstream of the direction of transfer that is arranged in recording paper P forms the first photosensitive drums 3a of station S1, and the size that the image after 51 couples of recording paper P of on-line sensor marginal position detects forms midway, be written to the electrostatic latent image on the first photosensitive drums 3a by the first exposing unit 8a is changed.And form among the photosensitive drums 3b-3d of station S2-S4 at second to the 4th image of more close direction of transfer downstream one side than it, before electrostatic latent image being written to photosensitive drums 3b-3d respectively, carry out writing based on the electrostatic latent image of the size (reducing the size of margin range as far as possible) of the testing result of 51 couples of recording paper P of line sensor marginal position by exposing unit 8b-8d.So, form among the cleaning device 7b-7d of station S2-S4 at second to the 4th image, can reduce the toner amount of the waste that is not transferred to recording paper P and is recovered effectively, there is tremendous lengthening in the cycle till the container of cleaning device 7b-7d is overflowed.

And, in the data store 406 of image processing system X, storage in advance is used for proofreading and correct the data that form position (sequential) with respect to the image that forms image to other photosensitive drums 3b-3d of benchmark photosensitive drums (the first photosensitive drums 3a of for example upstream one side), go up the picture position that forms according to each photosensitive drums 3b-3d of this adjustment of data, and control the image that each photosensitive drums 3a-3d go up to be formed and deviation can not take place, thereby correct overlappingly misalignment can not take place.Therefore, each photosensitive drums 3a-3d goes up the image range of formation also according to the transmission sequential of the recording paper P that is obtained by line sensor 51, the data of delivering position, and be used to carry out the correction data of color registration and determine, thereby can be not by the position deviation of each photosensitive drums 3a-3d, write about institutes such as the position deviation of electrostatic latent image, the transmission inclination of transfer printing travelling belt 13 to photosensitive drums 3b-3d by exposing unit 8b-8d, can make the surplus degree of the scope that forms image less.

Further, because the landscape images according to the electrostatic latent image of the set value of the horizontal wide W0 of selected recording paper P and input forms position and the multiplying power that regional wide W4 comes setting recording paper P epigraph, therefore when the scope that electrostatic latent image is written to the first photosensitive drums 3a when recording paper P being carried out the change midway of image formation when change of location, multiplying power, then image can lose continuity, or image produces crooked, if and the position of image, multiplying power are set according to predetermined data, then can carry out preferable image and form.

And, in the above-described first embodiment, first image forms to accommodate among the first developing apparatus 5a of station S1 to accommodate among the second developing apparatus 5b that black toner, second image form station S2 to accommodate among the 3rd developing apparatus 5c that cyan toner, the 3rd image form station S3 among the 4th developing apparatus 5d that magenta toner, the 4th image form station S4 accommodates yellow toner, and this is an example.Black toner, cyan toner, magenta toner and yellow toner can be housed in each image in any order and form in the developing apparatus at station.

(second embodiment)

In the above-described first embodiment, line sensor 51 marginal position of detection record paper P only.And in second embodiment, its marginal position that changes to recording paper P is detected at two places of recording paper direction of transfer, but the also askew status of detection record paper P is carried out following explanation to this embodiment.In addition, be marked with identical reference marks, and explanation is mainly based on difference for the component parts identical with first embodiment.

Figure 11 is the synoptic diagram of first and second photosensitive drums peripheral structure in expression second embodiment.Figure 12 be used for the declare record paper askew status, from the observed planimetric map in transfer printing travelling belt top.

Line sensor 51 detects the marginal position of the recording paper P that transmits to transfer printing point G at two places of recording paper direction of transfer (the first initial check point R1 of marginal position that comprises recording paper P).So, as shown in figure 12, according to recording paper P about the parallel center line o in a side edge (limit parallel) with direction of transfer with respect to the inclination angle [theta] of the parallel lines h parallel with the recording paper direction of transfer, detect the askew status of recording paper P.In this case, according to line sensor 51 for the first time and secondary assay intervals (mistiming), this first time and secondary testing result, be the transfer rate that reads result (position), recording paper P at the edge of one side about recording paper P, calculate the inclination angle [theta] of recording paper P by control part 40a (with reference to Figure 13).

And, as shown in figure 11, the first initial check point R1 of the recording paper P marginal position that carries out from line sensor 51 begins distance L 1 till the transfer printing point G and sets to such an extent that write the distance L 0 of a Q till the above-mentioned transfer printing point G less than what undertaken by the first exposing unit 8a from the first photosensitive drums 3a that forms station S1 to first image that electrostatic latent image (image) writes.(structure of image formation system)

Figure 13 is the block diagram of image formation system structure of the image processing system X of expression second embodiment.And, only be control part 40a with the difference of Fig. 4 of first embodiment.

By being arranged on being used on the operating portion 405 when switching to change-over switch (not shown) that the non-flanged image forms pattern and switching to the non-flanged image and form pattern, form on the first photosensitive drums 3a of the S1 that stands than beginning to be written to first image to the big electrostatic latent image of size of the recording paper P that transfer printing point G transmits by transfer printing travelling belt 13.When marginal position that detects recording paper P by line sensor 51 and askew status, size to electrostatic latent image on the first photosensitive drums 3a of this recording paper P transfer printing midway after it is changed according to the marginal position of 51 couples of recording paper P of above-mentioned line sensor and the testing result of askew status.Electrostatic latent image (toner image) on the first photosensitive drums 3a that is changed according to this size, the image of proceeding this recording paper P after it forms.

Particularly, as Fig. 5 and shown in Figure 14, the recording paper P of horizontal wide W0 (left and right directions vertical with the recording paper direction of transfer wide) is transmitted, when arriving registration roller 10,10, the transmission of recording paper P is tilted by being corrected with the coupling of the apical position of registration roller 10,10 among the paper transport path S.Correct a deviation (deviation between two dot-and-dash lines shown in Figure 14 and the dotted line) by recording paper P under this rectification, try to achieve effective wide W1 on the direction vertical (comprise the deviation that is shifted when correcting the recording paper P that is sent to registration roller 10,10, consider that also recording paper P's that registration roller 10,10 has not been corrected is crooked) with the direction of transfer of recording paper P.Add margin value W2, W2 about 1mm in the both sides of this effective wide W1 respectively, determine that the landscape images vertical with the recording paper direction of transfer forms regional wide W4 (W1+W2 * 2).Begin to be written on the first photosensitive drums 3a of first image formation station S1 by the first exposing unit 8a at the electrostatic latent image that this landscape images is formed regional wide W4, when developing, begin to form the toner image that the landscape images bigger than the horizontal wide W0 of recording paper P forms regional wide W4 by the first developing apparatus 5a.At this moment, the set value of horizontal wide W0 by selected recording paper P, and the landscape images of the electrostatic latent image of input form regional wide W4, the position and the multiplying power of setting recording paper P epigraph, but also automatically or the structure of manually setting by the TipWizard of image processing system X.

The landscape images that this first image forms the toner image (electrostatic latent image) on the first photosensitive drums 3a of station S1 forms that regional wide W4 is in the horizontal scope vertical with the recording paper direction of transfer of initial setting, the size according to each recording paper P, kind and store the value of data store 406 in advance into.And, as shown in figure 15, W5 is the margin value that contains before and after the direction of transfer (vertically) of the initial change of the recording paper P that registration roller 10,10 causes and surplus, and this margin value W5 also stores data store 406 in advance according to size, the kind of each recording paper P.And W7 is the set value of the length of recording paper P direction of transfer, and the set value W7 of the length of this recording paper P also stores in the data store 406 in advance according to size, the kind of each recording paper P.W71 is the set value that the set value W7 of recording paper P length is converted to the composition of the length parallel with the recording paper direction of transfer.And, the set value W71 of margin value W5 by the recording paper direction of transfer and the length parallel with recording paper P direction of transfer determines that the first photosensitive drums 3a that first image forms S1 in the station goes up the vertical image forming area length W9 (W7+W5 * 2) parallel with the recording paper direction of transfer of toner image (electrostatic latent image).In addition, these values are calculated by predetermined value, but the set value W7 of the margin value W5 of recording paper direction of transfer, recording paper P length also can store data store 406 in advance according to size, the kind of each recording paper P.

And the testing result of the recording paper P marginal position under the first check point R1 that carries out according to above-mentioned line sensor 51 obtains the actual horizontal stroke wide W01 vertical with recording paper P direction of transfer.Calculate the landscape images that adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 respectively to the wide W01 of the actual horizontal stroke left and right sides of this acquisition by operational part 407 and form regional wide W6 (W01+W3 * 2).On-line sensor 51 carries out before recording paper P marginal position under the first check point R1 detects, the landscape images of the electrostatic latent image that will write by the first exposing unit 8a on the first photosensitive drums 3a (by the toner image of first developing apparatus 5a development) forms regional wide W4, change to the landscape images of electrostatic latent image that forms the testing result of the recording paper P marginal position under the first check point R1 that line sensor 51 midway carries out based on the first photosensitive drums 3a epigraph and form regional wide W6, and on the first photosensitive drums 3a, continue to write electrostatic latent image by the first exposing unit 8a.Promptly, before the detection of the recording paper P marginal position under the first check point R1 that on-line sensor 51 carries out and afterwards, the landscape images that the first photosensitive drums 3a is gone up the electrostatic latent image that writes by the first exposing unit 8a (toner image of developing by the first developing apparatus 5a) forms wide the changing to from W4 in zone and reduces to W6.

And, the detection of the recording paper P marginal position under the first check point R1 that carries out from above-mentioned line sensor 51 begins through after the stipulated time, when the testing result under the R2 on next second check point of acquisition, according to the testing result under testing result under this second check point R2 and the above-mentioned first check point R1 (about recording paper P one side's edge read result), the assay intervals (schedule time is poor) of the first check point R1 that line sensor 51 carries out and the second check point R2, the transfer rate of recording paper P, calculate the inclination angle [theta] of recording paper P by control part 40a, detect the askew status of recording paper P according to this inclination angle [theta].Promptly, the testing result of the recording paper P marginal position under the second check point R2 that carries out according to line sensor 51, calculate the inclination angle [theta] of recording paper P, when detecting the askew status of recording paper P, before on-line sensor 51 carries out the detection of the recording paper P marginal position under the second check point R2 (askew status of recording paper P detect before), to be written to the testing result of the horizontal margin value W3 of the electrostatic latent image (by the toner image of first developing apparatus 5a development) on the first photosensitive drums 3a by the first exposing unit 8a according to askew status, change to less margin value W31 (for example about 1mm), the inclination angle [theta] of corresponding record paper P is controlled its deflection laterally (main scanning direction) simultaneously, and continues electrostatic latent image is written on the first photosensitive drums 3a by the first exposing unit 8a.In a word, before the askew status of the recording paper P that on-line sensor 51 carries out detects and after, to be reduced to W31 from the W3 change by the horizontal margin value that the first exposing unit 8a is written to electrostatic latent image on the first photosensitive drums 3a (toner image of developing by the first developing apparatus 5a), control corresponding to the inclination angle [theta] of recording paper P simultaneously, make it be partial to laterally (main scanning direction).

And, write electrostatic latent image (image) by the second exposing unit 8b to form the second photosensitive drums 3b that second image of station S1 near recording paper direction of transfer downstream one side form the S2 that stands than first image, after the detection of the recording paper P marginal position under the second check point R2 that on-line sensor 51 carries out, promptly after the detection of the askew status of recording paper P, carry out.As shown in figure 16, landscape images on this second photosensitive drums 3b forms regional wide W61 and the long W91 of vertical image forming area, the recording paper P marginal position under first and second check point R1, the R2 that carries out according to line sensor 51 and the testing result of askew status, carry out before electrostatic latent image writes change in advance at the second exposing unit 8b.Promptly, the long W91 of vertical image forming area on the second photosensitive drums 3b adds margin value W51 respectively according to both sides (both sides, front and back on the center line o) before and after the set value W71 of the testing result of recording paper P marginal position under first and second check point R1, the R2 that carry out to line sensor 51 and askew status longitudinal length that try to achieve, parallel with recording paper P direction of transfer and determines.On the other hand, the landscape images on the second photosensitive drums 3b forms the wide W01 of the actual horizontal stroke left and right sides that regional wide W61 goes up toner image (electrostatic latent image) by the second photosensitive drums 3b that forms from station S2 to second image and adds margin value W31 respectively and determine.

Further, forms the writing of the three photosensitive drums 3c of station S3, S4, electrostatic latent image (image) that 3d carry out to form station S2 than second image near the 3rd and the 4th image of recording paper direction of transfer downstream one side by exposing unit 8c, 8d, also be after marginal position that on-line sensor 51 carries out recording paper P under the second check point R2 detects, promptly after the askew status detection of recording paper P, carry out.As shown in figure 17, landscape images on the 3rd and the 4th photosensitive drums 3c, the 3d forms regional wide W61 and the long W92 of vertical image forming area, the marginal position of recording paper P and the testing result of askew status under first and second check point R1, the R2 that carries out according to line sensor 51, carry out before electrostatic latent image writes change in advance at exposing unit 8c, 8d.Promptly, the long W92 of vertical image forming area on the 3rd and the 4th photosensitive drums 3c, the 3d adds margin value W8 (for example about 1mm) respectively according to both sides (both sides, front and back on the center line o) before and after the set value W71 of the testing result longitudinal length that try to achieve, parallel with recording paper P direction of transfer of the marginal position of recording paper P under first and second check point R1, the R2 that carry out to line sensor 51 and askew status and determines.On the other hand, the toner image (electrostatic latent image) that forms on the second photosensitive drums 3b that regional wide W61 and second image that adds margin value W31 to the horizontal wide W01 of the reality left and right sides respectively form station S2 of the landscape images on the 3rd and the 4th photosensitive drums 3c, the 3d is identical.

(process flow diagram of the change step of the image forming area of electrostatic latent image)

Then, with reference to the process flow diagram of Figure 18 the image forming area change step based on the electrostatic latent image of the recording paper P marginal position of line sensor 51 and askew status testing result is described.

At first, in the step ST101 of the process flow diagram of Figure 18, at the start button of press operating part 405 and begin in step ST102, to judge whether that switching to the non-flanged image by change-over switch forms pattern after image forms action.The judgement of this step ST102 is when not switching to the non-flanged image and forming the "No" of pattern, advances to step ST114, finish common have edge image to form after, advance to following step ST112.

Each processing that among the step ST103,104 each handled among the step ST3,4 with Fig. 9 is identical.

Afterwards, in step ST105, detect the transverse edge position parallel under the first check point R1 (about a side side position) by line sensor 51,, obtain the horizontal reality horizontal wide W01 vertical with the direction of transfer of recording paper P according to this testing result with recording paper P direction of transfer.Afterwards in step ST106, calculate the landscape images that adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 respectively to the wide W01 of the actual horizontal stroke left and right sides that in above-mentioned steps ST105, obtains by operational part 407 and form regional W6, on-line sensor 51 carries out before the detection of recording paper P marginal position, the landscape images of the electrostatic latent image that will write by the first exposing unit 8a on the first photosensitive drums 3a (by the toner image of first developing apparatus 5a development) forms regional wide W4, form the testing result of recording paper P marginal position under the first check point R1 that line sensor 51 midway carries out according to the image on the first photosensitive drums 3a, the landscape images that changes to electrostatic latent image forms regional wide W6.

Afterwards, in step ST107, detect the transverse edge position parallel under the second check point R2 (about a side side position) with recording paper P direction of transfer by line sensor 51.Then in step ST108, in the testing result of above-mentioned steps ST107, the transfer rate of the assay intervals (mistiming) of first and second check point R1, the R2 that carries out according to line sensor 51, the testing result under this each check point R1, R2 (marginal position read result), recording paper P, calculate the inclination angle [theta] of recording paper P, and the askew status of detection record paper P.And, the horizontal margin value W3 of electrostatic latent image is changed to less margin value W31, make landscape images form the inclination angle [theta] deflection horizontal (main scanning direction) of zone, continue electrostatic latent image is written to the first photosensitive drums 8a by the first exposing unit 8a corresponding to recording paper P.

Afterwards, in step ST109, to forming regional wide W61 (with reference to Figure 16) and vertical margin value 51 to the landscape images that forms the electrostatic latent image (image) that photosensitive drums 3b-3d that second to the 4th image of station S1 near recording paper direction of transfer downstream one side form station S2-S4 writes than first image by exposing unit 8b-8d, the recording paper P marginal position that carries out according to line sensor 51 and the testing result of askew status are set, and begin to write electrostatic latent image by the second exposing unit 8b on the second photosensitive drums 3b.Afterwards, in step ST110, second to the 4th image is formed the set value W71 of the longitudinal length of the electrostatic latent image (toner image) on the photosensitive drums 3b-3d of station S2-S4, the recording paper P marginal position that carries out according to line sensor 51 and the testing result of askew status are calculated.Determine that both sides add vertical image forming area length W91 (W71+W51 * 2) of margin value W51 respectively before and after the set value W71 of this longitudinal length, and proceed the second photosensitive drums 3b that second image forms station S2 and go up writing of electrostatic latent image.Further, both sides add margin value W8 respectively (with reference to Figure 17 before and after the 3rd and the 4th image forms the photosensitive drums 3c of station S3, S4, the set value W71 of longitudinal length of electrostatic latent image (toner image) on the 3d, for example about 1mm), determine to be written to photosensitive drums 3c, the vertical image forming area length W92 (W71+W8 * 2) of the electrostatic latent image on the 3d that the 3rd and the 4th image forms station S3, S4.Afterwards, in step ST111, begin to form station S3, S4 by exposing unit 8c, 8d and write electrostatic latent image to the 3rd and the 4th image.

Each processing among the step ST112,113 is identical respectively with each processing among the step ST10,11 of Fig. 9.

(sequential chart that electrostatic latent image writes)

Then, with reference to each image of the sequential chart subtend of Figure 19 form the disconnecting sequential of the registration roller clutch coupling of the driving force that writes sequential, disconnecting registration roller clutch coupling 10,10 that writes electrostatic latent image on the photosensitive drums 3a-3d of station S1-S4, recording paper P marginal position that line sensor 51 carries out the detection sequential, and the detection sequential of alignment sensor 10a describe.

In the sequential chart of Figure 19, forming to first image and writing electrostatic latent image on the first photosensitive drums 3a of station S1 is benchmark with detection (ON) time that begins of alignment sensor 10a, with T2 after second be connected (ON) of registration roller clutch coupling almost begin simultaneously, write electrostatic latent image from the first photosensitive drums 3a that forms station S1 to this first image and begin T4 after second, promptly, after the detection of on-line sensor 51 marginal position (position, the left and right sides) parallel that carry out (beginning T3 after second) from the detection of alignment sensor 10a with recording paper P direction of transfer, before the recording paper P marginal position of on-line sensor 51 detected, the landscape images that is written to the electrostatic latent image on the first photosensitive drums 3a by the first exposing unit 8a formed regional wide W4, changed to the landscape images of electrostatic latent image that image on the first photosensitive drums 3a forms the testing result of the recording paper P marginal position that carries out based on line sensor 51 midway and formed regional wide W6.

And, at the marginal position T41 that detects recording paper P under the first check point R1 by line sensor 51 after second, the detection of recording paper P marginal position under the second check point R2 that carries out being undertaken (about a side side position) by line sensor 51.In this testing result, the transfer rate of the assay intervals (mistiming) of first and second check point R1, the R2 that carries out according to line sensor 51, the testing result under this each check point R1, R2 (marginal position read result), recording paper P, calculate the inclination angle [theta] of recording paper P, and the askew status of detection record paper P.And, second to the 4th image forms among the S2-S4 of station writing of electrostatic latent image (image) that carry out to photosensitive drums 3b-3d that undertaken by exposing unit 8b-8d, write electrostatic latent image at the first photosensitive drums 3a and begin second through T4 from the S1 that stands to the formation of first image, after the detection of the recording paper P marginal position that on-line sensor 51 carries out, further pass through T41 second, the recording paper P marginal position under the second check point R2 that on-line sensor 51 carries out detects back (after the askew status detection of recording paper P) interval preset time to carry out successively.Promptly, landscape images on the photosensitive drums 3b-3d of second to the 4th image formation station S2-S4 forms regional wide W61 and vertical image forming area length W91, W92, the testing result of the recording paper P marginal position that carries out according to line sensor 51 carries out setting after changing in advance before electrostatic latent image writes at exposing unit 8b-8d.

In addition, the dotted line that reads sequential of line sensor 51 and the implication of solid line etc. are the same with first embodiment that reference Figure 10 is illustrated.

And, in the image processing system X of this second embodiment, also carry out color registration and proofread and correct control.That is, in the data store 406 of image processing system X, storage in advance is used for proofreading and correct with respect to data benchmark photosensitive drums (the first photosensitive drums 3a of for example upstream one side), form position (sequential) to the image of other photosensitive drums 3b-3d.And, carry out the testing result of recording paper P marginal position and askew status under first and second check point R1, the R2 according to these data and line sensor 51, proofread and correct each photosensitive drums 3b-3d and go up picture position and the image forming area that forms, and control the image that each photosensitive drums 3b-3d go up to be formed and deviation can not take place, thereby correct overlappingly misalignment can not take place.

Therefore, in the above-described 2nd embodiment, when the change-over switch by operating portion 405 switched to non-flanged image formation pattern, the electrostatic latent image bigger than the size of recording paper P began to be written on the first photosensitive drums 3a of first image formation station S1.When detecting the marginal position of recording paper P by line sensor 51, the size of the electrostatic latent image on the first photosensitive drums 3a that the recording paper P after it is transferred midway, the testing result (testing result of recording paper P marginal position under the first check point R1) of carrying out according to above-mentioned line sensor 51 changes.And, when detecting the marginal position of recording paper P under the second check point R2 by line sensor 51, calculate the inclination angle [theta] of recording paper P according to this testing result, and detect recording paper P askew status, when the landscape images of change electrostatic latent image forms the zone, corresponding to the inclination angle [theta] deflection horizontal (main scanning direction) of recording paper P.Proceeding its image to this recording paper P afterwards according to the electrostatic latent image (toner image) on this first photosensitive drums 3a that is changed forms.Particularly, when the recording paper P of the wide W0 of horizontal stroke is transmitted and be positioned roller 10,10 rectification tops,, try to achieve the effective wide W1 of recording paper P by correcting a deviation of the recording paper P under this rectification as Fig. 5 and shown in Figure 14.And, determine that the landscape images that adds the recording paper of margin value W2, W2 about 1mm in the both sides of this effective wide W1 respectively forms regional wide W4 (W1+W2 * 2), the electrostatic latent image of the wide W4 of image forming area that this is horizontal begins to be written on the first photosensitive drums 3a of first image formation station S1 by the first exposing unit 8a.Testing result when the recording paper P marginal position that carries out according to line sensor 51, when trying to achieve the wide W0 of the actual horizontal stroke of recording paper P, as shown in figure 14, calculate the landscape images that adds the image (electrostatic latent image and toner image) on the first photosensitive drums 3a of margin value W3 respectively to the wide W0 of the actual horizontal stroke left and right sides of this acquisition by operational part 407 and form regional wide W6.And, on-line sensor 51 carries out before the marginal position detection of the recording paper P under the first check point R1, the landscape images of the electrostatic latent image that will write by the first exposing unit 8a on the first photosensitive drums 3a (by the toner image of first developing apparatus 5a development) forms regional wide W4, form the testing result of recording paper P marginal position under the first check point R1 that line sensor 51 midway carries out according to the image on the first photosensitive drums 3a, the landscape images that changes to electrostatic latent image forms regional wide W6.Further, when detecting the marginal position of recording paper P under the second check point R2 by line sensor 51, the transfer rate of the assay intervals (mistiming) of first and second check point R1, the R2 that carries out according to line sensor 51, the testing result under this each check point R1, R2 (marginal position read result), recording paper P, calculate the inclination angle [theta] of recording paper P, and the askew status of detection record paper P.And, when the horizontal margin value W3 with electrostatic latent image changes to less margin value W31, make landscape images form the inclination angle [theta] deflection horizontal (main scanning direction) of regional corresponding record paper P, on the first photosensitive drums 3a, continue to write electrostatic latent image by the first exposing unit 8a.Promptly, with afterwards, the landscape images that the first photosensitive drums 3a is gone up the electrostatic latent image (by the toner image of first developing apparatus 5a development) that writes by the first exposing unit 8a forms regional wide change minimizing before the recording paper P marginal position that on-line sensor 51 carries out and the detection of askew status.Therefore, on-line sensor 51 carries out before the marginal position and askew status detection of recording paper P, even marginal position and the askew status of recording paper P do not detect, also can the crooked good image of missing image that causes that can not produce because of recording paper P be transferred to recording paper P by than the toner image (electrostatic latent image) on the first big photosensitive drums 3a of recording paper P size.On the other hand, on-line sensor 51 carries out after recording paper P marginal position and the askew status detection, even the first photosensitive drums 3a epigraph determining dimensions is not in time carried out, also can be according to the testing result of recording paper P marginal position and askew status, make the first photosensitive drums 3a go up the toner size of images and change to size based on recording paper P marginal position.So, can reduce the toner that is not transferred to recording paper P and in cleaning device 7a, reclaims as far as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in the incorporate cleaning unit 7a of the container of the developer of accommodating recovery, the developer that can suppress to reclaim is the developer deflection of more storage partly, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And, being undertaken before recording paper P marginal position and askew status detect by on-line sensor 51, electrostatic latent image is written on the first photoreceptor 3a by the first exposing unit 8a, can make line sensor 51 near transfer printing point G settings.The transmitting range L1 that begins the recording paper P till the transfer printing point G from the check point R1 (R2) of the recording paper P marginal position of line sensor 51 shortens at the direction of transfer of recording paper P, can realize the densification of image processing system X, and can shorten image and form the required time.

And line sensor 51 is arranged on the downstream that the recording paper of registration roller 10,10 transmits, and therefore the inclination transmission of the recording paper P that transmits to transfer printing point G is corrected to a certain extent by registration roller 10,10.Therefore, under the state that recording paper P almost is corrected, detect the marginal position of recording paper P by line sensor 51, can high Precision Detection go out the marginal position of recording paper P, and can reduce the size of the image that surplus is arranged on the first photosensitive drums 3a that recording paper P marginal position that on-line sensor 51 carries out and askew status form before detecting as much as possible.So, can make the quantitative change of developer of the waste that is not transferred to recording paper P and is recovered few.

And, set less than writing the distance L 0 of a Q till the above-mentioned transfer printing point G because the check point R1 (R2) of line sensor 51 is begun distance L 1 till the transfer printing point G, so the detection of the recording paper P marginal position of line sensor 51 can carried out than the stage of morning from what write electrostatic latent image to the first photosensitive drums 3a.Detect the recording paper P marginal position afterwards and the testing result of askew status according to this line sensor 51, the size that the first photosensitive drums 3a goes up electrostatic latent image is promptly changed, and can more efficiently reduce the amount of the toner of the waste that is not transferred to recording paper P and is recovered.

And, form the first photosensitive drums 3a of station S1 at first image that is arranged in the upstream of recording paper P direction of transfer, the image after the recording paper P marginal position of on-line sensor 51 and heeling condition detect forms midway the size that is written to the electrostatic latent image on the first photosensitive drums 3a by the first exposing unit 8a and is changed.And form among the photosensitive drums 3b-3d of station S2-S4 at second to the 4th image of more close direction of transfer downstream one side than it, before electrostatic latent image being written to photosensitive drums 3b-3d respectively, carry out writing based on the electrostatic latent image of the size (reducing the size of margin range as far as possible) of the testing result of the recording paper P marginal position of line sensor 51 by exposing unit 8b-8d.So, form among the cleaning device 7b-7d of station S2-S4 at second to the 4th image, can reduce the toner amount of the waste that is not transferred to recording paper P and is recovered effectively, there is tremendous prolongation in the cycle till the container of cleaning device 7b-7d is overflowed.

And, in the data store 406 of image processing system X, storage in advance is used for proofreading and correct and forms the data of position (sequential) with respect to benchmark photosensitive drums (the first photosensitive drums 3a of for example upstream one side) to the image of other photosensitive drums 3b-3d, first and second check point R1 that carries out according to these data and line sensor 51, the testing result of recording paper P marginal position and askew status under the R2, proofread and correct each photosensitive drums 3b-3d and go up the picture position that forms, deviation can not take place in the image that each photosensitive drums 3b-3d go up to be formed, thereby and controls and make it correct overlappingly misalignment can not take place.Therefore, even exist each photosensitive drums 3a-3d position deviation, carry out the position deviation that writes of electrostatic latent image, the transmission inclination of transfer printing travelling belt 13 etc. by exposing unit 8b-8d to photosensitive drums 3b-3d, also can be after the testing result that obtains recording paper P marginal position that line sensor 51 carries out and askew status, for the recording paper P that on transfer printing travelling belt 13, transmits, the image of as far as possible little scope is formed on each photosensitive drums 3a-3d, can makes the surplus degree of the scope that forms image less.

(the 3rd embodiment)

In the 3rd embodiment of the present invention, changed from the check point of line sensor and begin the distance till the transfer printing point and a little begin distance till the transfer printing point from writing of exposing unit.Be explained according to Figure 20 and Figure 21.And, except the check point from line sensor begins distance and writing the setting that a little begins the distance till transfer printing point from exposing unit till the transfer printing point, other structures are identical with above-mentioned second embodiment, be marked with same symbol for identical part, and omitted its detailed description.

Promptly, in this 3rd embodiment, the distance setting that the check point that carries out recording paper P marginal position from line sensor begins till the transfer printing point must be than fully long from writing the distance that writing of electrostatic latent image (image) a little begin till the transfer printing point by the first exposing unit 8a to the first photosensitive drums 3a that first image forms the S1 that stands.

(process flow diagram of the image forming area change step of electrostatic latent image)

Describe with reference to the process flow diagram of Figure 20 change step at this image forming area of the electrostatic latent image of the testing result of the recording paper P marginal position that carries out based on line sensor 51 and askew status.

At first, in the step ST21 of the process flow diagram of Figure 20, the start button of press operating part 405 begins in step ST22, to judge whether that having switched to the non-flanged image by change-over switch forms pattern after image forms action.When being judged as of this step ST22 do not switch to the non-flanged image and form the "No" of pattern, advance to step ST33, finish common have edge image to form after, advance to following step ST31.

When being judged as among the step ST22 switches to the "Yes" of non-flanged image formation pattern, in step ST23, detect the transverse edge position parallel under the first check point R1 (about a side side position) by line sensor 51 with recording paper P direction of transfer, according to this testing result, obtain to transmit literary composition to the horizontal wide WO1 of vertical horizontal reality (with reference to Figure 21) with recording paper P.Afterwards in step S24, dimension information by the recording paper P that uses, to be stored in the data in the data store 406, as shown in figure 21, set respectively: the first photosensitive drums 3a that first image forms station S1 goes up margin value W5, and vertical set value W71 of the recording paper direction of transfer of electrostatic latent image of electrostatic latent image of horizontal margin value W3 (joining the margin value of the wide W01 of the actual horizontal stroke left and right sides of recording paper P respectively), the initial change that comprises the recording paper P that registration roller 10,10 causes and the margin range of electrostatic latent image.

Then, in step ST25, the first photosensitive drums 3a that forms station S1 to first image upward forms writing of regional wide W4 (W01+W3 * 2) beginning electrostatic latent image by the first exposing unit 8a with landscape images.

Among the step ST26-30 each handle respectively among the step ST107-111 with Figure 18 respectively handle identical.

Among the step ST31,32 each handle respectively among the step ST10,11 with Fig. 9 respectively handle identical.

Therefore, in the above-described 3rd embodiment, the distance setting that begins till the transfer printing point of the check point of the recording paper P marginal position that carries out from line sensor must be than fully long from writing the distance that writing of electrostatic latent image a little begin till the transfer printing point by the first exposing unit 8a to the first photosensitive drums 3a that first image forms station S1.Therefore, when detection record paper P marginal position, after transfer sheet is opened P and finished the detection of recording paper P marginal position under the first check point R1 of line sensor 51, begin to carry out writing by the electrostatic latent image of the first exposing unit 8a on the first photosensitive drums 3a.So, can make the testing result that is written to recording paper P marginal position under the first check point R1 that size that the first photosensitive drums 3a that first image forms station S1 goes up electrostatic latent image carries out according to line sensor 51 be set at less size.Further, recording paper P marginal position and askew status also can be detected in the stage early under the first check point R1 of line sensor 51, the size that the first photosensitive drums 3a after it goes up electrostatic latent image can promptly change according to the askew status of recording paper P, can more efficiently reduce the amount of the toner of the waste that is not transferred to recording paper P and is recovered.

(the 4th embodiment)

Then the 4th embodiment of the present invention is described with reference to Figure 22.

In this embodiment, be suitable for the digital copier of monochromatic mode as image processing system.

That is, as shown in figure 22, this digital duplicating machine X1 has scanner section 60, carries out image formation system that image forms and paper delivery mechanism 700 from P to this image formation system transfer sheet that open to recording paper P.Below each several part is described.

(explanation of scanner section 60)

Scanner section 60 has the original copy mounting table 61 that is made of clear glass etc., transmits the two-sided corresponding automatic manuscript handling device (RADF of original copys to this original copy mounting table 61; ReversingAutomatic Document Feeder) 62, be the part that is used to read the original image on this original copy mounting table 61 and makes view data.

Above-mentioned RADF62 has the multipage original copy that will the place automatic paper feeding dish 62a of automatic paper feeding to the original copy mounting table 61 page by page.And this RADF62 can make following scanning element 63 read the single or double of original copy according to user's selection.Particularly, have and be used for the original copy on the automatic paper feeding dish 62a is sent to transfer path on the original copy mounting table 61, makes and should read the two-sided of original copy and the reversing paths of counter-rotating original copy by scanning element 63.And, when only reading the single face of original copy, only use transfer path, and in reversing paths, reverse, and be sent to once again on the original copy mounting table 61 when reading the original copy that original copy will be sent to via transfer path on the original copy mounting table 61 when two-sided.Therefore, be provided with the sensor group (all omitting diagram) that the path is transmitted switch unit and is used to discern the original copy delivering position in each path.Structure for RADF62 is well-known, therefore omits its detailed description.

And this scanner section 60 has and is used to read the scanning that is sent to the original image on the original copy mounting table 61 single 63.This scanning single 63 has: lamp reflector assembly 64, a plurality of catoptron 65a, 65b, 65c, optical lens body 66, photo-electric conversion element (CCD) 67.

Above-mentioned lamp reflector assembly 64 is the devices that are used for to being placed on the original copy irradiation light on the original copy mounting table 61.Each catoptron 65a, 65b, 65c are shown in two dashdotted light paths among Figure 22, and will be from the reflection downwards after the left reflection in figure temporarily of the reflected light of original copy, right-hand reflection in figure afterwards be with towards optical lens body 66.

Image as original copy reads action, when original copy is placed on the above-mentioned original copy mounting table 61, the first scanning element 63a that is made up of lamp reflector assembly 64 and catoptron 65a scans in the horizontal direction along original copy mounting table 61, to original copy WBR light.At this moment, the second scanning element 63b that is made up of catoptron 65b, 65c is for the above-mentioned first scanning element 63a, moves to same direction with the speed of estimated rate (relative to half speed of the first scanning element 63a).

And, having passed through image formation by rays by the optical lens body 66 of above-mentioned each catoptron 65a, 65b, 65c reflection on photo-electric conversion element 67, reflected light is transformed to electronic signal (original image data) in this photo-electric conversion element 67.

And, the view data that is obtained is sent to following image processing part (not shown) like this, after finishing various processing, temporarily store in the video memory (not shown), according to output command, view data in the video memory is read out, and the image that is used for image formation system forms action.

(explanation of image formation system)

Image formation system has laser writing unit 81 and electrofax handling part 82.Laser writing unit 81 is that the laser radiation of the view data that will send based on the original image data that are transformed in the above-mentioned photo-electric conversion element 67, from personal computer etc. is to the device as photosensitive drums 3 surfaces of the image-carrier of electrofax handling part 82.Particularly, this laser writing unit 81 has: the semiconductor laser light resource that shines the laser corresponding with above-mentioned view data, make the polygon prism of this laser, the f-θ lens that the laser of proofreading and correct, make this constant angular velocity to be partial to scans with uniform velocity etc. on photosensitive drums 3 with the constant angular velocity deflection.

Photosensitive drums 3 along direction shown in arrow rotation, forms electrostatic latent image from the laser of laser writing unit 81 by be reflected mirror 81a reflection and irradiation in its surface in Figure 22.

And the structure of electrofax handling part 82 is configurations around above-mentioned photosensitive drums 3: charged device 4, developing apparatus 5, transfer printing device 6, discharger 83, stripper, cleaning device 7, and fixing device 2.Charged device 4 makes and forms the predetermined current potentials of the preceding photosensitive drums of electrostatic latent image 3 surface bands.Developing apparatus 5 is to develop by the electrostatic latent image that toner forms photosensitive drums 3 surfaces to be the device of visual image.Transfer printing device 6 is to make photosensitive drums 3 surfaces go up the device that the toner image that forms is transferred to recording paper P.Fixing device 2 is to make the toner image that is transferred to recording paper P by the device of heat fixer to recording paper P, has warm-up mill 21 and backer roll 22.Discharger 83 is used to remove the residual charge on photosensitive drums 3 surfaces.Stripper and cleaning device 7 are being removed remaining toner on photosensitive drums 3 surfaces after the toner transfer printing.At this moment, cleaning device 7 is integrally formed with container.

So, when forming image on recording paper P, make photosensitive drums 3 surfaces have predetermined current potential by charged device 4, laser writing unit 81 will form electrostatic latent image to photosensitive drums 3 surfaces based on the laser radiation of view data.Afterwards, developing apparatus 5 visual image that colour developer forms on photosensitive drums 3 surfaces is transferred to toner image the recording paper P that transmits from paper delivery mechanism 700 by transfer printing device 6.Afterwards, this recording paper P is heated by fixing device 2, and toner image is by photographic fixing.On the other hand, the residual charge on photosensitive drums 3 surfaces is removed by discharger 83, and the toner that remains in photosensitive drums 3 surfaces is removed by stripper and cleaning device 7.So, form the one-period end of action (printing action) to the image of recording paper P.By carrying out this cycle repeatedly, multipage recording paper P, P... are carried out image serially form.

(explanation of paper delivery mechanism 700)

Paper delivery mechanism 700 is that recording paper P, the P... that will be housed in first, second and third carton 71,72,73, the compound manual dish 74 transmit page by page, the image that carries out under the above-mentioned image formation system forms, and will form record images paper P simultaneously and output to first, second or the 3rd device of arranging paper disc 91,92,93.And this paper delivery mechanism 700 has double-sided copying unit 75, is used for another side being carried out being formed by the image that image formation system carries out after forming record images paper P on the temporary transient recovery single face.

In each carton 71,72,73, contain recording paper P, the P... of different size, from the carton of the recording paper P that accommodated user's required size, take out recording paper P page by page successively, be sent to image formation system successively via transfer path 70.

Transfer path 70 as this paper delivery mechanism 700 comprises main transfer path 76 and counter-rotating transfer path 77.

One end of main transfer path 76 (upstream extremity one side of recording paper direction of transfer) branch, respectively with each carton 71,72,73, and discharge one side of compound manual dish 74 relative, simultaneously the other end (downstream end one side of recording paper direction of transfer) via transfer printing device 6 and fixing device 2 with to have the after-treatment device 90 of arranging paper disc 91,92,93 relative.

One end (upper end among the figure) of counter-rotating transfer path 77 is connected with main transfer path 76 in the side (left side among the figure) than the more close downstream of allocation position of fixing device 2, and midway partly (middle body of above-below direction among the figure) branch into first and second individual path 77A, 77B.The first individual path 77A extends to vertical lower.And the end of the second individual path 77B is relative with transmission one side of double-sided copying unit 75.

The coupling part of main transfer path 76 and counter-rotating transfer path 77, and the component of counter-rotating transfer path 77 on be respectively equipped with the pawl 77a of first and second branch, 77b.

The first pawl 77a of branch the primary importance of closing counter-rotating transfer path 77 and close main transfer path 76 discharge a side, make between the second place that this main transfer path 76 and counter-rotating transfer path 77 be communicated with, can rotate freely along transverse axis.When the pawl 77a of this first branch is positioned at primary importance, directly be discharged to paper disc 91,92,93 via the recording paper P of image formation system.On the other hand, when the first pawl 77a of branch is positioned at the second place, be provided to counter-rotating transfer path 77 via the recording paper P of image formation system.

The second pawl 77b of branch is at the first individual path 77A that opens counter-rotating transfer path 77 and close the border the primary importance of the second individual path 77B and open the second individual path 77B and close between the second place of the first individual path 77A, can rotate freely along transverse axis.When the pawl 77b of this second branch was positioned at primary importance, the recording paper P that is sent to counter-rotating transfer path 77 was directed into the first individual path 77A and is sent to its lower end position.When the second pawl 77b of the branch direction of transfer that becomes the second place, recording paper P was reversed afterwards, this recording paper P was sent to second fen branch road 77B through branching portion, and is provided to double-sided copying unit 75.That is, recording paper P is provided to double-sided copying unit 75 through first fen branch road 77A and second fen branch road 77B, thereby this recording paper P is upside down when being provided to image formation system, can carry out image to the reverse side of recording paper P and form.

The upstream extremity of main transfer path 76 (with carton 71,72,73, compound manual dish 74, and the relative part of discharge one side of double-sided copying unit 75) on be provided with pick-up roller 78.And, be provided with a plurality of paper-feed rolls 79 that the recording paper P that is used for taking out is sent to main transfer path 76 in the downstream of each pick-up roller 78 side.By the rotation of this pick-up roller 78 and paper-feed roll 79, be housed in carton 71,72,73, compound manual dish 74, and the recording paper P of double-sided copying unit 75 can optionally be sent to main transfer path 76 page by page.

And, as mentioned above,, have first and second row's paper disc 91,92 of two sections up and down as row's paper portion of this digital duplicating machine X1, equipped one the 3rd row's paper disc 93 of the not shown bookbinding processing machine that is installed on the after-treatment device 90.That is, have the transfer path that connects main transfer path 76 downstream end and each row's paper disc 91,92,93 in the inside of after-treatment device 90, according to row's paper disc 91,92,93 of discharging recording paper P, transfer path is switched.

And, than photosensitive drums 3 more close recording paper P direction of transfer upstreams one side, be provided with registration roller 10,10, be used for the temporary transient recording paper P that is sent to image formation system through transfer path 70 successively that preserves.And, the toner image (image) that forms on than above-mentioned photosensitive drums 3 is transferred to upstream one side of the more close recording paper direction of transfer of transfer printing point of recording paper P, is provided with the line sensing 55 that is used to detect to the marginal position (end position) of the recording paper P of transfer printing point transmission.This line sensing 55 is arranged on the side top of the direction vertical with recording paper P direction of transfer.And, line sensor 55 one have lighting unit (not shown) and the light receiving element to transfer path 70 1 sides (below) irradiation irradiates light, the recording paper P reflection that whether is transmitted according to the irradiates light from this illumination unit also receives the marginal position of detection record paper P by the light receiving element.And, line sensor 55 is arranged on downstream one side of the recording paper direction of transfer of above-mentioned registration roller 10,10, on-line sensor 55 carries out before the marginal position detection of recording paper P, correct the transmission of recording paper P by registration roller 10,10 to a certain extent and tilt, and adjust on the photosensitive drums 3 toner image (image) with respect to the position of this recording paper P.At this moment, beginning distance setting till the transfer printing point from the check point of the recording paper P marginal position of line sensor 55, must to carry out the distance that writing of electrostatic latent image (image) a little begin till the above-mentioned transfer printing point than the laser writing unit 81 from photosensitive drums 3 short.In addition, the 40 expression control parts of the reference marks among Figure 22.

Therefore, in the above-described embodiment, be transferred to the recording paper P that sends to the transfer printing point than the image on the big photosensitive drums 3 of recording paper P size.When detecting the marginal position of recording paper P by line sensor 55, according to the testing result of line sensor 55, change is transferred to the size of recording paper P photosensitive drums 3 epigraphs midway after it.That is, before obtaining the detection of testing result that line sensor 55 carries out recording paper P marginal position and after detecting, change is formed on the picture size on the photosensitive drums 3.Therefore, before on-line sensor 55 detects, even do not carry out the detection of recording paper P marginal position, also can cause that with not producing missing image, good image are transferred on the recording paper P by than the image on the big photosensitive drums 3 of recording paper P size owing to recording paper P transmits deviation.Even the first photosensitive drums 3a epigraph determining dimensions is not in time carried out, after on-line sensor 55 detects, also can be according to the testing result of the marginal position of recording paper P, make picture size on the photosensitive drums 3a change to size based on the marginal position of recording paper P.So, can reduce the toner that is not transferred to recording paper P and in cleaning device 7, reclaims as far as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in incorporate cleaning unit 7, the developer that can suppress to reclaim is the developer deflection of more storage partly at the container of the developer of accommodating recovery, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And, undertaken on photosensitive drums 3, forming image before the recording paper P rim detection by on-line sensor 55, line sensor 55 is provided with near transfer printing point G.So, the transfer path that begins the recording paper P till the transfer printing point G from the check point of the recording paper P marginal position of line sensor 55 shortens at direction of transfer, can realize the densification of image processing system X1, and can shorten image and form the required time.

Further,, therefore can make line sensor 55 and lighting unit integrated, assembling is become easily, and can use the small scanning line image sensing head of market sale because line sensor 55 has lighting unit and light receiving element integratedly.

(the 5th embodiment)

In the above-described 4th embodiment, line sensor 55 marginal position of detection record paper P only.And in the 5th embodiment, with the marginal position of its two detection record paper P of place that change at the recording paper direction of transfer, but the also askew status of detection record paper P is carried out following explanation to this embodiment.In addition, be marked with identical reference marks, and explanation is mainly based on difference for the component parts identical with the 4th embodiment.

In the 5th embodiment, before on-line sensor 55 carried out the detection of recording paper P marginal position and askew status, the recording paper P transfer printing that transmits to transfer printing point was than the image on the big photosensitive drums 3 of recording paper P size.When detecting recording paper P marginal position and askew status by line sensor 55, after it, according to the recording paper P marginal position of line sensor 55 and the testing result of askew status, change is transferred to the picture size on the recording paper P photosensitive drums 3 midway.That is, before the detection of the testing result of recording paper P marginal position that obtains line sensor 55 and askew status and after detecting, the size of images that is formed on the photosensitive drums 3 becomes big.Therefore, on-line sensor 55 carries out before the detection of recording paper P marginal position and askew status, even do not carry out the detection of recording paper P marginal position and askew status, also can be by than the image on the big photosensitive drums 3 of recording paper P size, will can not produce since the missing image that the transmission deviation of recording paper P causes, good image is transferred on the recording paper P.Even the first photosensitive drums 3a epigraph determining dimensions is not in time carried out, on-line sensor 55 carries out after the detection of recording paper P marginal position and askew status, also can the picture size on the photosensitive drums 3a be changed to based on the marginal position of recording paper P and the size of askew status (inclination angle [theta]) according to the marginal position of recording paper P and the testing result of askew status.So, can reduce the toner that is not transferred to recording paper P and in cleaning device 7, reclaims as far as possible, suppress the developer waste, use developer economically, and can prolong the cycle that the developer of recovery overflows.And in the incorporate cleaning unit 7 of the container of the developer of accommodating recovery, the developer that can suppress to reclaim is the developer deflection of more storage partly, can prevent that the part of the developer that reclaims from leaking the cleaning problems that causes.

And, undertaken on photosensitive drums 3, forming image before recording paper P marginal position and the askew status detection by on-line sensor 55, line sensor 55 is provided with near transfer printing point G.So, the transfer path that begins the recording paper P till the transfer printing point G from the check point of the recording paper P marginal position of line sensor 55 shortens at direction of transfer, can realize the densification of image processing system X1, and can shorten image and form the required time.

(other embodiments)

And, the invention is not restricted to the respective embodiments described above, also comprise other various variation.For example, in the respective embodiments described above, in a side vertical line sensor 51,55 is set with recording paper P direction of transfer, also can be as shown in figure 23, line sensor 51,51 (perhaps 55,55) is set respectively on the side (being downside in Figure 23) of the direction vertical with recording paper P direction of transfer and opposite side (being upside among Figure 23).And, as shown in figure 24, also can to opposite side (being upside among Figure 24) line sensor 56 long on the left and right directions be set from a side (being downside Figure 24) of the direction vertical with recording paper P direction of transfer.In this case, the marginal position of the recording paper P left and right sides can be comparatively correctly detected, the detection of high-precision marginal position can be carried out.

And, in above-mentioned first to the 3rd embodiment, the check point that line sensor carries out recording paper P marginal position begins the distance till the transfer printing point of writing a little of the electrostatic latent image that must be undertaken by the first exposing unit 8a (laser writing unit 81) than the first photosensitive drums 3a (photosensitive drums 3) that forms station S1 since first image to the distance setting of transfer printing point position, and line sensor carry out the check point of recording paper P marginal position begin to the distance of transfer printing point position also can set the electrostatic latent image that carries out from the exposing unit of photosensitive drums of ratio write a little begin till the transfer printing point apart from weak point.In this case, when detecting the askew status of recording paper, owing to need the detection of recording paper P marginal position under the second check point R2 that transfer sheet Zhang Bingjin line sensor to a certain extent carries out, therefore need the time for the askew status that detects recording paper, after leaning on, the time that photosensitive drums writes electrostatic latent image detecting the askew status of recording paper than beginning by exposing unit.When detecting the askew status of recording paper, the picture size on the photosensitive drums after it is changed rapidly according to the askew status of recording paper, can reduce the toner amount of the waste that is not transferred to recording paper and is recovered.

Further, in above-mentioned the 4th, the 5th embodiment, electrostatic latent image (image) is written to photosensitive drums 3, also can uses and utilize the solid state scanning type light pen unit of light-emitting device arrays such as LED, EL to write electrostatic latent image by laser writing unit 81.

In addition, the present invention can implement under the prerequisite that does not break away from its spirit and principal character in every way.Therefore, the foregoing description only is simple example from every side, must not do determinate explanation.Scope of the present invention is not subjected to any constraint of instructions text shown in the claim scope.And interior distortion, the change of impartial scope that belongs to the claim scope all belongs within the scope of the invention.

The application's request is willing to 2003-130453 number, and the right of priority of being willing to the 2003-134609 patented claim the spy of Japan's application on May 13rd, 2003 based on the spy in Japan's on May 8th, 2003 application.Therefore its content all comprises in this application.And the document of quoting in this instructions all comprises in the present invention.

The possibility of utilizing on the industry

As mentioned above, image processing system of the present invention is applicable to for example colored and monochromatic mode The image processing system of the electrofax such as digital copier, printer mode etc.

Claims (17)

1. an image processing system forms image according to the view data of importing on image-carrier, and above-mentioned image is transferred on the paper that is transmitted, and forms image on this paper, and this image processing system is characterised in that:

Upstream one side be transferred to the more close paper conveyance direction of transfer printing point of above-mentioned paper than the image that forms on above-mentioned image-carrier is provided with detecting unit, is used to detect the end position of the above-mentioned paper that transmits to above-mentioned transfer printing point,

When the picture size on the above-mentioned image-carrier than when the size of the above-mentioned paper of above-mentioned transfer printing point transmission is big, above-mentioned detecting unit is carried out above-mentioned paper end position detect the size that is transferred to above-mentioned paper above-mentioned image-carrier epigraph midway afterwards, testing result according to above-mentioned detecting unit changes

Image on the above-mentioned image-carrier that is changed according to this size, the image to above-mentioned paper after proceeding forms.

2. image processing system according to claim 1 is characterized in that:

Carry out above-mentioned paper end position at above-mentioned detecting unit and be formed on image on the above-mentioned image-carrier before detecting, consider to the transmission deviation of the above-mentioned paper of above-mentioned transfer printing point transmission to be set to bigger size with surplus.

3. image processing system according to claim 1 is characterized in that:

Above-mentioned detecting unit is arranged on downstream one side of positioning unit, above-mentioned positioning unit carries out above-mentioned paper end position at this detecting unit and corrects the transmission inclination of above-mentioned paper before detecting, and adjusts image on the above-mentioned image-carrier with respect to the position of above-mentioned paper.

4. image processing system according to claim 1 is characterized in that:

From the check point of above-mentioned detecting unit begin distance till the above-mentioned transfer printing point be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking,

Above-mentioned detecting unit carries out above-mentioned paper end position and detect the picture size that forms in the past on above-mentioned image-carrier, is set according to predetermined data, and,

Above-mentioned detecting unit carries out above-mentioned paper end position and detects picture size on the later above-mentioned image-carrier, is changed according to the testing result of above-mentioned detecting unit.

5. image processing system according to claim 1 is characterized in that:

Have a plurality of image-carriers, be configured in side by side on the direction of transfer that carries the paper carrier that transmits above-mentioned paper, above-mentioned paper is formed image respectively,

Picture size on the above-mentioned image-carrier that is positioned at the upstream of above-mentioned paper conveyance direction one side in above-mentioned each image-carrier is carried out the image formation of above-mentioned paper end position after detecting at above-mentioned detecting unit and is changed midway, and,

Picture size on remaining above-mentioned image-carrier, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit was changed before image forms.

6. image processing system according to claim 5 is characterized in that:

In in above-mentioned each image-carrier any one, have correction data, be used to proofread and correct the image formation position deviation of remaining above-mentioned image-carrier with respect to this above-mentioned image-carrier,

The picture size that on each above-mentioned image-carrier, forms, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit, and above-mentioned correction data be set.

7. according to any described image processing system of claim 1 to 6, it is characterized in that:

On above-mentioned image-carrier, form the position or the multiplying power of image, according to the testing result of the above-mentioned paper end position that carries out with above-mentioned detecting unit irrelevant, predetermined data are set.

8. according to any described image processing system of claim 1 to 6, it is characterized in that:

Can select the non-flanged image to form pattern, be used for above-mentioned paper is formed the non-flanged image,

When this non-flanged image forms pattern when selected, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit is carried out image and is formed.

9. image processing system according to claim 1 is characterized in that:

When the picture size on the above-mentioned image-carrier than when the size of the above-mentioned paper of above-mentioned transfer printing point transmission is big, the detection of the above-mentioned paper end position that is undertaken by above-mentioned detecting unit, further detect the askew status of above-mentioned paper, with the picture size that is transferred to afterwards on the above-mentioned paper above-mentioned image-carrier midway, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status change

Image on the above-mentioned image-carrier that is changed according to this size, the image to above-mentioned paper after proceeding forms.

10. image processing system according to claim 9 is characterized in that:

The image that carry out above-mentioned detecting unit above-mentioned paper end position and askew status form on above-mentioned image-carrier before detecting is considered to the transmission deviation of the above-mentioned paper of above-mentioned transfer printing point transmission to be set to the bigger size with surplus.

11. image processing system according to claim 9 is characterized in that:

Above-mentioned detecting unit is set at than positioning unit more by above-mentioned paper conveyance direction downstream one side, above-mentioned positioning unit be used for this detecting unit carry out above-mentioned paper end position and askew status detect before image on the above-mentioned image-carrier of adjustment with respect to the position of above-mentioned paper.

12. image processing system according to claim 9 is characterized in that:

Begin distance till the above-mentioned transfer printing point from the check point of above-mentioned detecting unit, be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking,

Above-mentioned detecting unit carries out above-mentioned paper end position and askew status detects the picture size that forms in the past on above-mentioned image-carrier, be set according to predetermined data, and,

Above-mentioned detecting unit carries out above-mentioned paper end position and askew status detects the picture size that forms on the later above-mentioned image-carrier, is changed according to the above-mentioned paper end position of above-mentioned detecting unit and the testing result of askew status.

13. image processing system according to claim 9 is characterized in that:

Begin distance till the above-mentioned transfer printing point from the check point of above-mentioned detecting unit, be set than the image from above-mentioned image-carrier write a little begin till the above-mentioned transfer printing point apart from lacking,

The picture size that forms on the above-mentioned image-carrier, the testing result of the above-mentioned paper end position that carries out according to above-mentioned detecting unit is set,

When detecting the askew status of above-mentioned paper by above-mentioned detecting unit, the size of images that forms on above-mentioned image-carrier after this detection is changed according to the testing result of the askew status of above-mentioned paper.

14. image processing system according to claim 9 is characterized in that:

Have a plurality of image-carriers, be configured in side by side on the direction of transfer that carries the paper carrier that transmits above-mentioned paper, above-mentioned paper is formed image respectively,

Be positioned at the picture size on the above-mentioned image-carrier of the upstream of above-mentioned paper conveyance direction one side in above-mentioned each image-carrier, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status, form the beginning back at image and changed, and

Picture size on remaining above-mentioned image-carrier, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status are changed before image forms beginning.

15., it is characterized in that according to claim 13 or 14 described image processing systems:

In in above-mentioned each image-carrier any one, have correction data, be used to proofread and correct the image formation position deviation of remaining above-mentioned image-carrier with respect to this above-mentioned image-carrier,

The size of images that on each above-mentioned image-carrier, forms, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status, and above-mentioned correction data set.

16. any described image processing system according to claim 9-14 is characterized in that:

On above-mentioned image-carrier, form the position or the multiplying power of image, according to the testing result of above-mentioned paper end position that carries out with above-mentioned detecting unit and askew status irrelevant, predetermined data set.

17. any described image processing system according to claim 9 to 14 is characterized in that:

Can select the non-flanged image to form pattern, be used for above-mentioned paper is formed the non-flanged image,

When this non-flanged image forms pattern when selected, the above-mentioned paper end position that carries out according to above-mentioned detecting unit and the testing result of askew status are carried out image and are formed.

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