CN101402290B - Image forming apparatus and image forming method - Google Patents

Image forming apparatus and image forming method Download PDF

Info

Publication number
CN101402290B
CN101402290B CN2008101619085A CN200810161908A CN101402290B CN 101402290 B CN101402290 B CN 101402290B CN 2008101619085 A CN2008101619085 A CN 2008101619085A CN 200810161908 A CN200810161908 A CN 200810161908A CN 101402290 B CN101402290 B CN 101402290B
Authority
CN
China
Prior art keywords
paper
print
image forming
forming apparatus
pattern
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2008101619085A
Other languages
Chinese (zh)
Other versions
CN101402290A (en
Inventor
田代和也
伊藤丰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of CN101402290A publication Critical patent/CN101402290A/en
Application granted granted Critical
Publication of CN101402290B publication Critical patent/CN101402290B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Ink Jet (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

A sensor reciprocates in a main scanning direction to detect lateral end portions of a sheet conveyed in a sub-scanning direction. A print head is mounted on a carriage reciprocating in the main scanning direction. A sheet-information acquiring unit acquires sheet information including a type and a size of the sheet. A positional-information storing unit stores positional information on lateral positions of the sheet on the conveying belt, corresponding to the size of the sheet. A control unit controls, when the type of the sheet is a pattern-printed sheet, a printing by the print head based on the positional information corresponding to the size of the sheet.

Description

Image forming apparatus and image forming method
Cross-reference to related applications
The application requires the priority of the Japanese priority file 2008-208136 that submits in Japan in the Japanese priority file 2007-261809 that submitted in Japan on October 5th, 2007 and on August 12nd, 2008, and comprises the full content of these files by reference.
Technical field
The present invention relates to a kind of image forming apparatus and a kind of image forming method.
Background technology
In typical image forming apparatus, use is gone up the reflective photoelectric sensor of installing at carriage (carriage) and is detected the fore-end of paper or the side of paper (1ateral end) part, accurately determine the print area of paper thus, described typical image forming apparatus is being uploaded when paper feeding opens at sub scanning direction by utilizing electrostatic force paper to be sticked on the surface of conveyer belt, uses serial head system (by comprising that the carriage of ink gun carries out the print system of printing moving on the main scanning direction) to come print image on paper.Therefore, described image forming apparatus can be accurately on described paper in print area print image, therefore might prevent that conveyer belt from being polluted by China ink.
If image forming apparatus can not on the paper in print area print image, then the part of image is not printed on the paper, perhaps image is not printed on the appointed area of paper, causes misprint.
When the part of image is not printed on the paper, be printed on the conveyer belt corresponding to the image of described part, so conveyer belt is polluted by China ink.Conveyer belt is generally made by extremely thin material, and therefore on its part of being polluted by China ink, the electrostatic force that acts on the paper reduces.As a result, lift paper from conveyer belt.Therefore, it may cause such problem, that is: the fuzzy or printhead of print image is damaged, because because paper unsteady causes paper surface and printhead friction.
In order to handle described problem, for example, Japanese patent application discloses 2006-038639 number and discloses a kind of end (end) position detecting device.Described end position checkout gear basis accurately detects the position of the end of paper about the catoptrical data that detected by reflective photoelectric sensor, and is not subjected to the change color of paper surface or the surface roughness affect of paper.Comprise about the data of the light of going up reflection at supporting member (member) with about the data of the light that on paper, reflects about catoptrical data by described support member support.
But, for example, when when going up print image such as the paper company's letter paper with corporate logo, that have print pattern (hereinafter referred to as " having printed the paper of pattern "), the accuracy of detection that discloses disclosed end position checkout gear in 2006-038639 number in Japanese patent application becomes inaccurate, because caused the wrong detection of photoelectric sensor.For example, when the pattern of printing in the approximate center of the paper of having printed pattern is detected as the end of the paper of having printed pattern, print image on the appointed area of the paper of having printed pattern correctly.
Summary of the invention
The objective of the invention is to solve at least in part the problem in conventional art.
According to an aspect of the present invention, provide a kind of image forming apparatus, having comprised: conveyer belt, it is uploaded paper feeding at sub scanning direction and opens; Sensor, it is reciprocal (reciprocate) on main scanning direction, to detect the side part of paper; Printhead, it is installed on carriage reciprocal on the main scanning direction; The paper information acquiring unit, it obtains the paper information of the type and size that comprise described paper; Positional information storage unit, its store therein corresponding to the size of described paper, about the positional information of the side locations (lateral position) of the paper on described conveyer belt; And, control module, when its type when described paper is the paper of having printed pattern, not according to the side part that is detected by the paper that described sensor detected, but according to controlling the printing of being undertaken by printhead with the big or small corresponding positional information of described paper.
In addition, according to another aspect of the present invention, provide a kind of image forming apparatus, having comprised: conveyer belt, it is uploaded paper feeding at sub scanning direction and opens; Sensor, it is reciprocal on the main scanning direction of described paper, so that detect the fore-end of described paper on sub scanning direction; Printhead, it is installed on carriage reciprocal on the main scanning direction; Registration (registration) roller, it controls described paper just in time to be parked in the front of conveyer belt; The paper information acquiring unit, it obtains the paper information of the type and size that comprise described paper; And, control module, when its type when described paper is the paper of having printed pattern, be controlled at the described paper of having printed pattern be transmitted corresponding to the transmitting range from described alignment rolls to described printhead apart from the time begin the printing undertaken by printhead.
In addition, according to another aspect of the present invention, a kind of image forming method that is used for image forming apparatus is provided, described image forming apparatus comprises positional information storage unit, described positional information storage unit store therein corresponding to the size of paper, about the positional information of the side locations of the described paper on conveyer belt.Described image forming method comprises: the paper information that obtains the type and size that comprise described paper; On sub scanning direction, transmit described paper; Detect the side part of described paper on main scanning direction; Print image on described paper; And, when the type of described paper is the paper of having printed pattern, not according to the side part that is detected by the paper that described sensor detected, but according to controlling printing with the big or small corresponding positional information of described paper.
When read in conjunction with the accompanying drawings, by following detailed description, will understand above-mentioned and other purposes, feature, advantage and technology and industrial significance of the present invention better to currently preferred embodiment of the present invention.
Description of drawings
Figure 1A and 1B are according to the sheet transport system of the image forming apparatus of the first embodiment of the present invention and the schematic diagram of image print system;
Fig. 2 is the block diagram according to the control system of the image forming apparatus of first embodiment;
Fig. 3 is the block diagram at the ios dhcp sample configuration IOS DHCP of the main scanning unit drives unit shown in Fig. 2;
Fig. 4 is the block diagram at the ios dhcp sample configuration IOS DHCP of the subscan unit drives unit shown in Fig. 2;
Fig. 5 is the block diagram at the ios dhcp sample configuration IOS DHCP of the paper feeding unit drives unit shown in Fig. 2;
Fig. 6 is the schematic diagram of the example that transmits of the paper of left-justify (alignment);
Fig. 7 is the schematic diagram of the example of right-aligned paper transmission;
Fig. 8 is the schematic diagram of the example of Centered paper transmission;
Fig. 9 A is the schematic diagram of the example of paper size tables of data;
Fig. 9 B is the schematic diagram of example of the content of the paper size data of storing in the paper size tables of data shown in Fig. 9 A;
Figure 10 is the schematic diagram that is used for the example of the relation of explanation between paper size, print area and margin (margin);
Figure 11 A is the schematic diagram of the example of margin tables of data;
Figure 11 B is the schematic diagram of example of the content of the margin data of storing in the margin tables of data shown in Figure 11 A;
Figure 12 is the schematic diagram that how is used to illustrate according to front-end and back-end (trailing) part that detects paper from the output signal of photoelectric sensor;
Figure 13 is used to illustrate how to detect the right-hand member of paper and the schematic diagram of left end portion according to the output signal from photoelectric sensor;
Figure 14 A and 14B are used to illustrate according to from the output signal of photoelectric sensor and the schematic diagram of the reason of the right-hand member of wrong detection paper and left end portion;
Figure 15 A and 15B are the schematic diagrames that the paper type that shows on the operation display unit shown in Fig. 2 is provided with the example of screen;
Figure 16 A-16C is the schematic diagram that the paper size that shows on operation display unit is provided with the example of screen;
Figure 17 is the flow chart by the example of the processing of carrying out according to the image forming apparatus of first embodiment, assign to determine print area according to the right-hand member of paper and left part;
Figure 18 A shows the schematic diagram of the state that paper do not line up on conveyer belt;
Figure 18 B is the schematic diagram of print area that is used to illustrate the paper of the margin with expansion;
Figure 18 C shows the schematic diagram at the print image of printing on the paper in the print area shown in Figure 18 B;
The paper margin of Figure 19 A-19D is the printing that shows on operation display unit pattern is provided with the schematic diagram of the example of screen;
Figure 20 be by carry out according to the image forming apparatus of first embodiment, be used for the flow chart of example that type according to paper is provided with the processing of margin;
Figure 21 A shows the schematic diagram of the print area that reduces of paper;
Figure 21 B shows at the schematic diagram of printing in the print area that reduces shown in Figure 21 A that is printed image on the paper;
The paper ratio (scale) of Figure 22 A-22C is the printing that shows on operation display unit pattern is provided with the schematic diagram of the example of screen;
Figure 23 is the flow chart by the example of the processing of the ratio of carrying out according to the image forming apparatus of first embodiment, be used to be provided with print image;
Figure 24 is by the flow chart according to the example of the processing of the image forming apparatus of first embodiment processing that carry out, that comprise clean belt;
Figure 25 is the flow chart in another example of the processing shown in Figure 24;
Figure 26 is the flow chart in another example of the processing shown in Figure 24;
Figure 27 A and 27B are the schematic diagrames that is used to illustrate according to the reason of the fore-end that detects paper from the output signal of photoelectric sensor mistakenly;
Figure 28 is the print area of the paper carried out by according to a second embodiment of the present invention image forming apparatus, be used to have determined to print pattern and do not detect the flow chart of example of processing of the fore-end of the paper of having printed pattern;
Figure 29 is the schematic diagram of the example of registration adjustment amount tables of data;
The paper registration adjustment amount of Figure 30 A-30C is the printing that shows on operation display unit pattern is provided with the schematic diagram of the example of screen;
Figure 31 is the flow chart by the example of the processing of carrying out according to the image forming apparatus of second embodiment, be used to be provided with the registration adjustment amount;
Figure 32 is by the flow chart of the example of the processing of carrying out according to the image forming apparatus of second embodiment when big minor error takes place; And
Figure 33 is by the flow chart according to the example of the processing of the image forming apparatus processing that carry out, that comprise clean belt of second embodiment when big minor error takes place.
The specific embodiment
Describe example embodiment of the present invention in detail below with reference to accompanying drawing.
Figure 1A and 1B are according to the sheet transport system of the image forming apparatus of the first embodiment of the present invention and the schematic diagram of image print system.Described image forming apparatus uses serial head (series head) to be used as printhead, and comprises three paper feeding pallets (tray) 1,7 and 12.
Paper feeding pallet 1 comprises paper PP1 therein.The picked roller 2 of the top sheet of paper PP1 picks up, and is fed to a pair of transfer roller 3.Described transfer roller 3 transmits the paper PP1 that is presented to transfer roller piece 4.Transfer roller piece 4 upward deflects paper PP1 so that paper PP1 is sent on the paper path of (up to) alignment rolls 5.Paper sensor 6 is provided at the downstream of transfer roller 3, and detects whether paper PP1 has passed through transfer roller 3.
Paper feeding pallet 7 comprises paper PP2 therein.The picked roller 8 of the top sheet of paper PP2 picks up, and is provided to a pair of transfer roller 9.Described transfer roller 9 transmits the paper PP2 that is presented to transfer roller piece 10.Transfer roller piece 10 upward deflects paper PP2 so that paper PP2 is sent on the paper path of alignment rolls 5.Particularly, paper PP2 is transmitted roller piece 10 and is sent to transfer roller piece 4, and is transmitted roller piece 4 and is sent on the paper path of alignment rolls 5.Paper sensor 11 is provided at the downstream of transfer roller 9, and detects whether paper PP2 has passed through transfer roller 9.
Paper feeding pallet 12 comprises paper PP3 therein.The picked roller 13 of the top sheet of paper PP3 picks up, and is provided to a pair of transfer roller 14.Transfer roller 14 transmits the paper PP3 that is presented to transfer roller piece 15.Transfer roller piece 15 upward deflects paper PP3 so that paper PP3 is sent on the paper path of alignment rolls 5.Particularly, paper PP3 is transmitted roller piece 15 and is sent to transfer roller piece 10, and is transmitted roller piece 10 and is sent to transfer roller piece 4, is transmitted roller piece 4 then and is sent on the paper path of alignment rolls 5.Paper sensor 16 is provided at the downstream of transfer roller 14, and detects whether paper PP3 has passed through transfer roller 14.
Paper sensor 17 just was provided at before alignment rolls 5, and detected any of the paper PP1, the PP2 that are sent on the paper path that leads to alignment rolls 5 and PP3.The paper that is transmitted is pressed (strike) being formed at folding on the part (nip portion) between alignment rolls 5 and the transfer roller 21.
The conveyer belt 20 that is used to transmit paper is transmitted roller 21 and transfer roller 22 supports, and is actuated to constantly move on sub scanning direction.When the surface of conveyer belt 20 is recharged device 23 chargings, produce electrostatic force thereon.Being crushed on the effect of paper by electrostatic force that folds on the part is adhered on the surface of conveyer belt 20.
Particularly, when alignment rolls 5 is carried out transfer operation, be crushed on fold the part on the effect of passing through electrostatic force be adhered on the surface of conveyer belt 20, make this paper with conveyer belt 20 by folding the position.Then, paper is transmitted the print position of band printhead 25.On the other hand, when alignment rolls 5 was not carried out transfer operation, promptly alignment rolls 5 was in when operation, was crushed on the state that folds part with paper and paper is remained on folded the part place.In other words, in this case, paper is not transmitted, and promptly stops to fold the part place.
Behind print image on the paper, electricity is eliminated unit 26 and is eliminated static from paper.Therefore, paper becomes such state that is in, that is, the surface of paper and conveyer belt 20 can be separated.Thereafter, by disengaging pawl 27 from the side of top of form with the surface isolation of paper from conveyer belt 20, and paper is sent to release (discharge) unit (not shown).
The surperficial coated blotting material of cleaning unit 28 is such as absorbent sponge.Cleaning unit 28 is positioned as usually with conveyer belt 20 and keeps a distance.Cleaning unit 28 contacts conveyer belt 20 when needed, and from cleaning surfaces (clean) China ink of conveyer belt 20.
Printhead 25 is installed on the carriage 30.Carriage 30 is reciprocal on the main scanning direction of the image that will print.As printhead 25, use the serial head.Carriage 30 has also been installed reflective photoelectric sensor 31 thereon, and it sends detection light to conveyer belt 20, and detects the light of reflection on conveyer belt 20.
Fig. 2 is the block diagram according to the control system of the image forming apparatus of first embodiment.
System control unit 41 is controlled at the operation of each unit that comprises in the image forming apparatus and print job etc.System storage 42 is used for storing therein the control handling procedure that will be carried out by system control unit 41, carry out the needed data of described handling procedure and about the information of image forming apparatus etc.In addition, system storage 42 is as the workspace of system control unit 41.Operation display unit 43 comprises that the user operates image forming apparatus necessary operations button and indicator.External interface (I/F) 44 is used for image forming apparatus is connected to host apparatus such as personal computer.In other words, external interface 44 is used for image forming apparatus and transmits to the data between the host apparatus.
Sensor groups 45 comprises sensor, and the sensor whether opening (opening) that go up to form such as the shell (enclosure) that is used to detect at image forming apparatus is opened/closes and being used to detects the sensor that the door of image forming apparatus whether is opened/closes.Paper separative element driver element 46 drives each in electricity elimination unit 26 and the disengaging pawl 27.
Print driver element 47 and suitably drive printhead driver element 48.Printhead driver element 48 drives printhead 25 and comes print image.The data that page (paged) memory 49 is used for storing therein about the print image of one page.Main scanning unit drives unit 50 driven brackets 30 move, and drive photoelectric sensor 31.Subscan unit drives unit 51 drives conveyer belt 20.Paper feeding unit drives unit 52 drives corresponding paper feeding unit, so that present any of a PP1, PP2 and PP3 from any one of paper feeding pallet 1,7 and 12.
Cleaning unit driver element 53 drives the surface of cleaning unit 28 clean belt 20.Charger driver element 54 drives charger 23.
System control unit 41, system storage 42, operation display unit 43, exterior I/F44, sensor groups 45, paper separative element driver element 46, printing driver element 47, paged memory 49, main scanning unit drives unit 50, subscan unit drives unit 51, paper feeding unit drives unit 52, cleaning unit driver element 53 and charger driver element 54 are connected to internal bus 55.Mainly via internal bus 55 swap data between these unit.
Fig. 3 is the block diagram of the ios dhcp sample configuration IOS DHCP of main scanning unit drives unit 50.
Main scanning unit drives unit 50 comprises carriage drive unit 50a, main scanning encoder 50b and photo-sensor signal will processing unit 50c.Carriage drive unit 50a driven bracket 30 is reciprocal on main scanning direction.Main scanning encoder 50b is used to detect the coordinate of the position of carriage 30 on main scanning direction.Photo-sensor signal will processing unit 50c handles the detection signal from photoelectric sensor 31.
Fig. 4 is the block diagram of the ios dhcp sample configuration IOS DHCP of subscan unit drives unit 51.
Subscan unit drives unit 51 comprises belt-driven unit 51a and subscan encoder 51b.Belt-driven unit 51a drives conveyer belt 20 and moves.Subscan encoder 51b is used to detect the travel distance of conveyer belt 20 on direction of transfer.
Fig. 5 is the block diagram of the ios dhcp sample configuration IOS DHCP of paper feeding unit drives unit 52.
Paper feeding unit drives unit 52 comprises that paper separates driver element 52a, transfer roller driver element 52b, alignment rolls driver element 52c and paper sensor signal processing unit 52d.Paper separate that driver element 52a drives pick-up roller 2,8 and 13 each can one by one transmit paper respectively to pick up any of corresponding paper PP1, PP2 and PP3, to make.Transfer roller driver element 52b drive many to transfer roller 3,9 and 14 and transfer roller piece 4,10 and 15 in each.Alignment rolls driver element 52c drives alignment rolls 5.Paper sensor signal processing unit 52d handles from each the detection signal in paper sensor 6,11,16 and 17.
Fig. 6 is the schematic diagram of the example of left-Aligned paper transmission.Fig. 7 is the schematic diagram of the example of right-aligned paper transmission.Fig. 8 is the schematic diagram of the example of Centered paper transmission.Described image forming apparatus can be chosen in the alignment schemes of the paper PP (being any of paper PP1, PP2 and PP3) that conveyer belt 20 transmits from the left-justify shown in Fig. 6-8, Right Aligns and center-aligned any one.
For the size (and orientation (orientation)) of paper PP, A3 vertically (portrait), B4 is vertical, A4 is vertical, A4 horizontal (landscape) and A5 laterally are applicable to image forming apparatus in this case.Incidentally, for put into practice convenient for the purpose of, to liken to the vertical bigger size of the A3 of the largest amount among Fig. 6-8 conveyer belt 20 is shown.But this does not mean that distance between transfer roller 21 and 22 is greater than the length of A3 paper.That is, conveyer belt 20 is actuated to constantly move, and makes that conveyer belt 20 can be considered to have unlimited size on moving direction.Therefore, Fig. 6-8 width (on the direction vertical with direction of transfer) of showing conveyer belt 20 is set to be slightly larger than the shorter length of A3 paper.
Under left-Aligned situation (referring to Fig. 6), the left end portion of every paper of all sizes is alignd at coordinate LL1 place.And, A5 laterally and A4 longitudinally each right end portion align at coordinate LL2 place.Equally, B4 longitudinally right end portion in coordinate LL3 place alignment, and A4 laterally and A3 longitudinally each right end portion align at coordinate LL4 place.
Under right-aligned situation (referring to Fig. 7), the right end portion of every paper of all sizes is alignd at coordinate LL4 place.And, A5 laterally and A4 longitudinally each left end portion align at coordinate LL6 place.Equally, B4 longitudinally left end portion in coordinate LL5 place alignment, and A4 laterally and A3 longitudinally each left end portion align at coordinate LL1 place.
Under Centered situation (referring to Fig. 8), A5 laterally and A4 longitudinally each left end portion align at coordinate LM3 place, its each right end portion is alignd at coordinate LM4 place.B4 left end portion longitudinally aligns at coordinate LM2 place, and its right end portion is alignd at coordinate LM5 place.A4 laterally and A3 longitudinally each left end portion align at coordinate LM1 place, and its each right end portion is alignd at coordinate LM6 place.
As each reference position (initial point) of described coordinate, can use the reference position (for example original (home) position of carriage 30) on main scanning direction.
By this way, the length of the print area of the paper PP on main scanning direction depends on alignment schemes, size and the orientation of paper P.In order to define print area, for example the paper size tables of data can be created and is stored in advance in the system storage 42.Fig. 9 A is the schematic diagram of the example of paper size tables of data.Fig. 9 B is the schematic diagram of example of the content of the paper size data of storing in the paper size tables of data shown in Fig. 9 A (that is, about according to the width of the paper of every kind of size and the data of length).Incidentally, only import customization during paper size as the user, just store customized paper size data in the paper size tables of data.
Figure 10 is the schematic diagram that is used to the example of the relation between paper size, print area and margin that illustrates.When print image on paper PP, determine print area AR by margin being set in the left of paper PP, right-hand, top and bottom.Under situation shown in Figure 10, top page back gauge WWa, bottom margin WWb, left margin are spaced apart from WWd apart from WWc and right margin.
Top page back gauge WWa, bottom margin WWb, the left margin standard value apart from WWc and right margin apart from WWd is stored in the margin tables of data as standard page back gauge data.And, about the printing of the value of top page back gauge, bottom margin, left margin distance and the right margin distance of the paper of having printed pattern the paper margin data of pattern also be stored in the margin tables of data.The margin tables of data is stored in the system storage 42.Figure 11 A is the schematic diagram of the example of margin tables of data.Figure 11 B is the schematic diagram of example of the content of the margin data of storing in the margin tables of data shown in Figure 11 A.Incidentally, as will explaining in detail after a while, the paper margin data of pattern have preferably been printed according to each pallet setting.As the paper margin data of having printed pattern, can store deviate with respect to standard value.
Subsequently, will describe the Method of printing of carrying out by according to the image forming apparatus of first embodiment below in detail.In first embodiment, Method of printing according to be used as paper PP1, PP2 and PP3 each the type of paper and different.In this case, have two types paper, promptly without any white common (plain) paper of print pattern (hereinafter referred to as " normal (normal) paper ") and such as the printing of company's letter paper with corporate logo or layout the paper of pattern.Incidentally, the plain paper of the color except white (for example black plain paper) has been regarded as printing the paper of pattern.
At first, the following describes the situation of image forming apparatus print image on normal paper.In this case, use photoelectric sensor 31 whether to detect the fore-end arrival print position of this normal paper, and also detect the right-hand member of normal paper and the position of left end portion.
Figure 12 is used to illustrate how according to the schematic diagram that detects the front-end and back-end part of paper PP from the output signal of photoelectric sensor 31.Figure 13 is used to illustrate how to detect the right-hand member of paper PP and the schematic diagram of left end portion according to the output signal from photoelectric sensor 31.As shown in figure 12, carry out the detection of the fore-end of paper PP with such state, described state promptly: movable support bracket 30 makes photoelectric sensor 31 be positioned at the approximate center of conveyer belt 20.
The light reflectivity of conveyer belt 20 is set to be lower than the light reflectivity of paper PP.Therefore, when photoelectric sensor 31 senses conveyer belt 20, low from the output signal level of photoelectric sensor 31.When photoelectric sensor 31 senses paper PP, uprise from the output signal level of photoelectric sensor 31.
Therefore, when being changed into when high from low, can determine that the fore-end PT of paper PP just arrives the front of print position from the output signal level of photoelectric sensor 31.
Then, when detecting fore-end PT, the detection of the right-hand member of execution paper PP and the position of left end portion.As shown in figure 13, movable support bracket 30 makes photoelectric sensor 31 be positioned on such position, described position promptly: photoelectric sensor 31 can according to carriage 30 on the main scanning direction from moving of home position and on width sensing conveyer belt 20 fully.
In this case, when photoelectric sensor 31 senses conveyer belt 20, low from the output signal level of photoelectric sensor 31.When photoelectric sensor 31 senses paper PP, uprise from the output signal level of photoelectric sensor 31.Therefore, when changing into when high from low, can determine to detect the right end portion PR of paper PP from the output signal level of photoelectric sensor 31.Therefore, by detecting the position of carriage 30 this moment on main scanning direction, can obtain the coordinate of the right end portion PR of paper PP.
When from the output signal level of photoelectric sensor 31 from height change into when low, can determine detect the left end portion PL of paper PP thereafter.Therefore, by detecting the position of carriage 30 this moment on main scanning direction, can obtain the coordinate of the left end portion PL of paper PP.
By this way, before print image on the paper PP, fore-end PT can be detected, and the coordinate of right end portion and left end portion PR and PL can be obtained.Therefore, image forming apparatus can accurately be grasped the position of paper PP.Therefore, image forming apparatus print image on paper PP correctly.
Subsequently, the following describes the situation of image forming apparatus print image on the paper of having printed pattern.If image forming apparatus with the paper of having printed pattern in mode identical under the situation of normal paper on print image, then photoelectric sensor 31 improperly sensing printed the right-hand member and the left end portion of the paper of pattern, so image forming apparatus may not specified print image in the print area on the paper that print pattern.
Figure 14 A and 14B are used to illustrate according to from the output signal of photoelectric sensor 31 and flase drop is surveyed the schematic diagram of the reason of the right-hand member of the paper of having printed pattern and left end portion.Suppose that shown in Figure 14 A the paper PPr that has printed pattern has the bigger print pattern RR that extends in its approximate center on sub scanning direction.From the output signal level of photoelectric sensor 31 during less than the background that sensing the paper PPr that has printed pattern in the output signal level from photoelectric sensor 31, the end of the print pattern RR that photoelectric sensor 31 senses may be defined as having printed the left end portion PL of the paper PPr of pattern improperly when sensing print pattern RR.
In this case, for example,, on having printed the paper PPr of pattern, be printed on the image shown in right-hand among Figure 14 B though the image shown in the left in Figure 14 B will be printed.That is, can not be regarded as left end portion PL improperly because printed the approximate centre of the paper PPr of pattern having printed the image that the printing user is intended on the paper PPr of pattern, promptly print area narrows down.
For fear of such problem, when will be on the paper of having printed pattern during print image, the paper that the user needs to have printed pattern in advance be chosen as print paper, and specifies the selected size of having printed the paper of pattern.
Figure 15 A and 15B are the schematic diagrames that the paper type of demonstration on operation display unit 43 is provided with the example of screen.The user specifies pallet 3 by the screen shown in Figure 15 A, and presses " OK " button, makes to occur at the screen shown in Figure 15 B.The user can confirm to have selected to comprise the pallet 3 of the paper of having printed pattern.As a result, can obtain information about paper (in this case for having printed the paper of pattern) type.
Figure 16 A-16C is the schematic diagram that the paper size of demonstration on operation display unit 43 is provided with the example of screen.The user is by specifying pallet 3 at the screen shown in Figure 16 A, and presses " OK " button, makes to occur at the screen shown in Figure 16 B.The user is by being appointed as the customization paper size at the screen shown in Figure 16 B with the size of the paper (having printed the paper of pattern) that comprises in pallet 3, and presses " OK " button, makes to occur at the screen shown in Figure 16 C.The user uses the numeric keypad input to print the specific size of the paper of pattern, so that the size of the paper of having printed pattern is set.Incidentally, if the user is by being appointed as paper size such as the normal paper of " A3 " size at the screen shown in Figure 16 B and pressing " OK " button, then do not occur at the screen shown in Figure 16 C, promptly the user does not need to import the specific size of the paper of having printed pattern.
In above-mentioned example, be provided with by the paper size that uses numeric keypad on operation display unit 43, to show and import the size of specifying the paper of having printed pattern on the screen.The method of size that the paper of having printed pattern is set is according to the model of image forming apparatus and difference.For example, in the different model of image forming apparatus, on each paper feeding pallet, provide dial (dial) (not shown), printed the size of the paper of pattern so that the user uses dial to specify.In addition, as another example, as one of sensor groups 45, paper size detecting sensor (not shown) can be provided on each paper feeding pallet, make when the user selects to comprise the pallet of the paper of having printed pattern, the paper size detecting sensor that provides on selected pallet detects the size of the paper of having printed pattern automatically, and the size of the paper of having printed pattern is set.As a result, can obtain information about the size of the selected paper of having printed pattern.
In addition, when user's selective printing the paper of pattern during as print paper, system control unit 41 controls are not carried out according to from the output signal of photoelectric sensor 31 and to the right-hand member of the paper of having printed pattern and the detection of left end portion.System control unit 41 is controlled the print area of determining on the width by this way, described mode is promptly: obtain paper size data corresponding to selected paper size from the paper size tables of data of storage in system storage 42, and calculate the right-hand member of the paper of having printed pattern and the coordinate of left end portion according to the paper size data of being obtained, promptly printed the width of the paper of pattern.Thereafter, on the paper of having printed pattern in determined print area print image.
For example, when will be on the vertical paper of A4 that center-aligned ground transmits during print image, the length of A4 paper is 210 millimeters (mm), so the coordinate LM3 of the left end portion of the vertical paper of A4 is-105mm, and the coordinate LM4 of the right end portion of the vertical paper of A4 is+105mm (referring to Fig. 8).Print image in the zone between coordinate LM3 and LM4 on the vertical paper of A4.
By this way, in the present embodiment, might prevent that the flase drop of paper right-hand member and left end portion from surveying.Therefore, print image on paper correctly.
Figure 17 by image forming apparatus carry out, the flow chart of the example of the processing of determining print area according to the right-hand member and the left end portion of paper.
Check that the paper that user whether will print pattern is appointed as print paper (step S101).When the paper that will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S101 not), then according to the right-hand member and the left end portion (step S102) that detect print paper from the output signal of photoelectric sensor 31.Image forming apparatus is carried out print job (step S103) according to the coordinate of right-hand member that is detected and left end portion.
When the paper that will print pattern as the user is appointed as print paper (at step S101 be), by according to the paper size data computation right-hand member that obtains from the paper size tables of data of system storage 42 in, storing and the coordinate of left end portion, the right-hand member of paper of pattern and the position (step S104) of left end portion have been determined to print.Described processing controls proceeds to step S103, and forming device is carried out print job (step S103) according to the coordinate that obtains at step S104.
Incidentally, in the present embodiment, system control unit 41 is controlled on the paper print image in the print area on the width of determining in the following manner: obtain paper size data corresponding to selected paper size from the paper size tables of data, and calculate the right-hand member of paper and the coordinate of left end portion according to the paper size data of being obtained, i.e. the width of paper.Perhaps, can calculate, be stored in advance in the paper coordinate data table as the paper coordinate data promptly according to the width of the paper of every kind of size, and with it according to the right-hand member of the paper of every kind of size and the coordinate of left end portion.In this case, print job is carried out in system control unit 41 control in the following manner: obtain paper coordinate data from paper coordinate data table corresponding to selected paper size, and on the paper in the print area that obtains according to the paper coordinate data print image.
By this way, can prevent the generation of following traditional problem according to the image forming apparatus of present embodiment: since fail accurately on the paper in print area print image, the part of image is not printed on the appointed area of paper or paper.
And, can prevent that according to the image forming apparatus of present embodiment the part of image is not printed on the misprint on the paper.Therefore, this part of image is not printed on the conveyer belt,, can prevent that conveyer belt from being polluted by China ink that is.Therefore, might prevent the lift behavior of paper, because the electrostatic force that acts on the paper is not reduced from conveyer belt.Therefore, the paper surface printhead that can not rub makes to prevent the problem that print image is fuzzy or printhead damages.
Do not using said method, promptly do not printing under the situation of print image on the paper of pattern according to the right-hand member that detects the paper of having printed pattern from the output signal of photoelectric sensor 31 and left end portion, when the paper of having printed pattern on the skew is transmitted on conveyer belt 20, described paper not alignment on conveyer belt 20 of having printed pattern is not promptly alignd on the tram of conveyer belt 20.Figure 18 A is the schematic diagram that the state that paper PP do not line up on conveyer belt 20 is shown.
In this case, if on the print area XP that the coordinate according to the right-hand member of the paper PP that is determined by system control unit 41 and left end portion obtains print image, then the physical location of paper PP does not correspond to the coordinate of right-hand member and left end portion.Therefore, print area XP partly exceeds paper PP, makes that printing is corresponding to the image of regional XX on conveyer belt 20.
For fear of such situation, for example, print area XP is changed and is print area XP ', and right margin distance and the left margin distance of expansion paper PP.Figure 18 B is the schematic diagram of print area XP ' that is used to illustrate the paper PP of right margin distance with expansion and left margin distance.
By this way, can on the paper PP in print area XP ' print image.Therefore, might prevent that conveyer belt 20 from being polluted by China ink.Figure 18 C is illustrated in paper PP goes up the print image of printing in print area XP ' schematic diagram.
For as mentioned above in the printing of margin with expansion print image on the paper of pattern, the user needs in advance by the paper of having printed pattern the value of margin that screen setting has been printed the paper of pattern to be set.
The paper margin of Figure 19 A-19D is the printing that shows on operation display unit 43 pattern is provided with the schematic diagram of the example of screen.The user is by coming the setting of specific page back gauge at the screen shown in Figure 19 A, and presses " OK " button, makes to occur at the screen shown in Figure 19 B.The user is by selecting pallet 3 (wherein comprising the paper of having printed pattern) at the screen shown in Figure 19 B, and presses " OK " button, makes to occur at the screen shown in Figure 19 C.The user is by being appointed as the margin that will be provided with at the screen shown in Figure 19 C with right (dorsal part (back side)) margin, and presses " OK " button, makes to appear at the screen shown in Figure 19 D.The user uses the particular value of numeric keypad incoming page back gauge, makes margin is set.Incidentally, when the travel distance of conveyer belt 20 increases, because the degree that do not line up of skew-caused paper PP broad ways on conveyer belt 20 of paper PP increases.Therefore, preferably, margin is set according to each of paper feeding pallet 1,7 and 12.
The margin that is provided with by the user is stored in as the paper margin data (according to each pallet) of having printed pattern in the margin tables of data that is stored in the system storage 42.
Figure 20 is carried out, is provided with according to paper type the flow chart of example of the processing of margin by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S201).When the paper that will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S201 not), obtain standard page back gauge data (step S202) from the margin tables of data of system storage 42 in, storing.Described image forming apparatus is carried out print job (step S203) according to the standard page back gauge data of being obtained.
When the paper that will print pattern as the user is appointed as print paper (at step S201 be), obtain the paper margin data (step S204) of having printed pattern from the margin tables of data of storage in system storage 42.Described processing controls proceeds to step S203, and described image forming apparatus according to the printing of obtaining at step S204 the paper margin data of pattern carry out print job (step S203).
In said method, when the paper that will print pattern is chosen as print paper, expanding printing the right margin distance and the left margin distance of paper of pattern, prevent that thus image from running out of conveyer belt 20.Perhaps, can downscaled images, so that it is printed on the print area XP that dwindles " in.In this case, might prevent that also image from running out of conveyer belt 20.Figure 21 A shows the print area XP that dwindles " schematic diagram.Figure 21 B shows the print area XP that is dwindling on the paper PP " in print the schematic diagram of print image.
For on the paper of having printed pattern in such print area that dwindles print image, the user needs by the paper of having printed pattern screen to be set in advance ratio (scale) is set.
The paper ratio of Figure 22 A-22C is the printing that shows on operation display unit 43 pattern is provided with the schematic diagram of the example of screen.The user is by coming the designated ratio setting at the screen shown in Figure 22 A, and presses " OK " button, makes to occur at the screen shown in Figure 22 B.The user is by specifying pallet 3 (wherein comprising the paper of having printed pattern) at the screen shown in Figure 22 B, and presses " OK " button, makes to occur at the screen shown in Figure 22 C.The user uses numeric keypad to import special ratios, so that ratio is set.Incidentally, when the travel distance of conveyer belt 20 increases, because the degree that do not line up of skew-caused paper broad ways on conveyer belt 20 of paper PP increases.Therefore, preferably, the ratio of the image that will print is set on paper PP according to each of paper feeding pallet 1,7 and 12.
The ratio that is provided with by the user is stored in as the paper ratio data of having printed pattern (according to each pallet) in the ratio data table that is stored in the system storage 42.
Figure 23 is carried out, is used to be provided with the flow chart of example of processing of the ratio of print image by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S301).When the paper that will print pattern as the user is appointed as print paper (at step S301 be), obtain the paper ratio data of having printed pattern from the ratio data table of storage in system storage 42, and scaled print image (step S302).Described image forming apparatus is printed scaled image (step S303) on the paper of having printed pattern.
When the paper that will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S301 not), processing controls proceeds to step S303, and described image forming apparatus is printed on print paper not by the image of bi-directional scaling (scale) (step S303).
In order to prevent that print image from running out of conveyer belt 20, the method for expansion right margin distance and left margin distance and the method for dwindling print image are as mentioned above.As another kind of method, can be set to narrow down by print area.
When any in using said method printed on the paper of pattern print image, do not carry out the right-hand member of the paper of having printed pattern and the detection of left end portion.Therefore, if user error be provided with incorrect paper size, if perhaps paper PP is on the skew transmitted, then might conveyer belt 20 be polluted by China ink.If carry out print job subsequently under the state that conveyer belt 20 is polluted by China ink, then paper PP subsequently is attached to the China ink pollution of conveyer belt 20.
For fear of such problem, behind print image on the paper of having printed pattern, clean belt 20 even make conveyer belt 20 be polluted by China ink, might prevent that also paper PP subsequently from being polluted by China ink.
Figure 24 is carried out, is comprised the flow chart of example of processing of the processing of clean belt 20 by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S401).When the paper that will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S401 not), detect the right-hand member and the left end portion (step S402) of print paper according to output signal from photoelectric sensor 31.Image forming apparatus is carried out print job (step S403) according to the coordinate of right-hand member that is detected and left end portion.
When the paper that will print pattern as the user is appointed as print paper (at step S401 be), then by according to the paper size data computation right-hand member that obtains from the paper size tables of data of system storage 42 in, storing and the coordinate of left end portion, the right-hand member of paper of pattern and the position (step S404) of left end portion have been determined to print.Described image forming apparatus is carried out print job (step S405) according to the right-hand member that obtains at step S404 and the coordinate of left end portion.Thereafter, the surface (step S406) of cleaning unit 28 clean belt 20.
During each image of on the paper of having printed pattern, having printed according to each page, can carry out the processing on the surface of such clean belt 20.
Figure 25 is carried out, is comprised the flow chart of another example of processing of the processing of clean belt 20 by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S501).When the paper that will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S501 not), detect the right-hand member and the left end portion (step S502) of print paper according to output signal from photoelectric sensor 31.Described image forming apparatus is carried out print job (step S503) according to the coordinate of right-hand member that is detected and left end portion.
When the paper that will print pattern as the user is appointed as print paper (at step S501 be), by according to the paper size data computation right-hand member that obtains from the paper size tables of data of system storage 42 in, storing and the coordinate of left end portion, the right-hand member of paper of pattern and the position (step S504) of left end portion have been determined to print.Described image forming apparatus has been printed the image (step S505) of printing one page on the paper of pattern according to the coordinate of right-hand member that obtains at step S504 and left end portion.Thereafter, the surface (step S506) of cleaning unit 28 clean belt 20.
Check the image (step S507) of whether on the paper of having printed pattern, having printed all pages.When printing the image of all pages on the paper of also not printed pattern (step S507 not), processing controls turns back to step S505, till having printed the image of the last page on the paper of having printed pattern.When having printed the image of all pages on the paper of having printed pattern (at step S507 be), processing finishes.
In order to reduce the required time of image of printing all pages, cleaning unit 28 can be configured to when finishing print job, i.e. the surface of clean belt 20 when finishing the image of printing all pages.In this case, for example can when printing request in the scheduled time slot when having printed image, determine whether on the paper of having printed pattern, to have printed the image of the last page from last.
Figure 26 is carried out, is comprised the flow chart of another example of processing of the processing of clean belt 20 by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S601).When the paper that also will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S601 not), detect the right-hand member and the left end portion (step S602) of print paper according to output signal from photoelectric sensor 31.Described image forming apparatus is carried out print job (step S603) according to the coordinate of right-hand member that is detected and left end portion.
When the paper that will print pattern as the user is appointed as print paper (at step S601 be), then by according to the paper size data computation right-hand member that obtains from the paper size tables of data of system storage 42 in, storing and the coordinate of left end portion, the right-hand member of paper of pattern and the position (step S604) of left end portion have been determined to print.Described image forming apparatus has been printed the image (step S605) of printing one page on the paper of pattern according to the coordinate of right-hand member that obtains at step S604 and left end portion.Check the image (step S606) of whether on the paper of having printed pattern, having printed all pages.When printing the image of all pages on the paper of also not printed pattern (step S606 not), processing controls turns back to step S605, till having printed the image of the last page on the paper of having printed pattern.
When having printed the image of all pages on the paper of having printed pattern (at step S606 be), the surface (step S607) of cleaning unit 28 clean belt 20, and processing finishes.
By this way, in image forming apparatus according to first embodiment, when the paper that will print pattern is chosen as print paper, obtains to have printed the right-hand member of paper of pattern and the coordinate of left end portion by paper size data and determine print area based on storage in advance.Therefore, image forming apparatus can be correctly on the paper of having printed pattern in print area print image.
In first embodiment, the right-hand member of the paper by accurately determining to have printed pattern and the position of left end portion, image forming apparatus is print image on the appointed area of the paper of having printed pattern correctly.In a second embodiment, image forming apparatus is configured to accurately to have determined to print the position of fore-end of the paper of pattern, thus print image on the appointed area of the paper of having printed pattern correctly.Incidentally, suppose that the image forming apparatus according to second embodiment has and the configuration identical according to the image forming apparatus of first embodiment.The part identical with the part of first embodiment represented with identical drawing reference numeral, and omitted the explanation of those parts.
As described in first embodiment, detect the fore-end of paper PP according to output signal from photoelectric sensor 31.But, when with the paper of having printed pattern in mode identical under the situation of normal paper on during print image, photoelectric sensor 31 sensing has improperly been printed the fore-end of the paper of pattern, thus image forming apparatus may not be in the print area in appointment on the paper of having printed pattern print image.
Figure 27 A and 27B are used to illustrate according to from the output signal of photoelectric sensor 31 and flase drop is surveyed the schematic diagram of reason of the fore-end of the paper PPr ' that has printed pattern.For example, suppose as shown in Figure 27 A that the paper PPr ' that has printed pattern has print pattern RR ' on its front, in the zone by photoelectric sensor 31 sensings.Following situation may take place: when retroreflective photoelectric sensor 31 senses print pattern RR ', from the output signal level step-down of photoelectric sensor 31.In this case, the print pattern RR ' by photoelectric sensor 31 sensings may be defined as conveyer belt 20 improperly.
Just at photoelectric sensor 31 by behind the rear end of print pattern RR ', uprise from the output signal level of photoelectric sensor 31, make the fore-end PT that the rear end is defined as having printed improperly the paper PPr ' of pattern.
As a result, for example,, on having printed the paper PPr ' of pattern, be printed on the image shown in the right side among Figure 27 B though will be printed on the image shown in the left side among Figure 27 B.That is, the bottom of image is printed on the conveyer belt 20.
For fear of such problem, determine the position of the fore-end of paper PP according to paper PP from the travel distance of alignment rolls 5, because the distance between alignment rolls 5 and the printhead 25 is structurally roughly constant.
Particularly, at first, temporarily stop the transmission of paper PP with following state, described state promptly: the fore-end of paper PP is crushed on by conveyer belt 20 and transmits the inlet point in the zone of paper PP, and what promptly form between alignment rolls 5 and transfer roller 21 folds the part place.This can carry out in the following manner: from paper PP by described when folding the paper sensor 17 of part upstream paper PP be transmitted time enough so as to be transmitted in paper sensor 17 and the described distance that folds between the part after, stop the transmission of paper PP, make the fore-end of paper PP be crushed on the described part place that folds.Incidentally,, can measure or the unit of the conveying capacity of default paper PP described image forming apparatus if comprising, and then can be but control the transmission of paper PP according to conveying capacity not according to the delivery time.
Then, conveyer belt 20 is actuated to move the distance of advancing, this travel distance with from folding partly to just the distance below photoelectric sensor 31 is corresponding.Described distance depends on the layout (layout) that is used for described transmission, and is write in the system in advance.Can determine whether conveyer belt 20 is actuated to the moving target distance according to the driving amount of monitoring by the change amount that reads subscan encoder 51b with fixed intervals.
When conveyer belt 20 is actuated to move with when folding part to the corresponding travel distance of distance photoelectric sensor 31 below just the paper transmission software control that activation will be carried out when detecting the on-state of sensor.
By such control, even without according to the fore-end that detects the paper of having printed pattern from the output signal of photoelectric sensor 31, image forming apparatus also can be to have printed print image on the appointed area of paper of pattern with precision identical in the situation of the paper except the paper of having printed pattern.
Figure 28 is the print area of the paper carried out according to the image forming apparatus of second embodiment, be used to have determined to print pattern and do not detect the flow chart of example of processing of the fore-end of the paper of having printed pattern.
Check that the paper that user whether will print pattern is appointed as print paper (step S701).When the paper that also will not print pattern as the user is appointed as print paper, be print paper when not being the paper of having printed pattern (step S701 not), according to the fore-end (step S702) that detects print paper from the output signal of photoelectric sensor 31.Detecting the timing of fore-end, described image forming apparatus is carried out print job (step S703).
When the paper that will print pattern as the user is appointed as print paper (at step S701 be), by conveyer belt 20 is driven with move with from alignment rolls 5 to the corresponding travel distance of the distance below photoelectric sensor 31 just, the paper of having printed pattern is sent to printing initiating position (step S704).Thereafter, processing controls proceeds to step S703, and described image forming apparatus is carried out print job.
When the fore-end with paper PP partly was sent to the precalculated position from folding of formation between alignment rolls 5 and transfer roller 21, the site error of paper PP may appear owing to the operate miss of alignment rolls 5.Such site error is called as registration error.Usually, described image forming apparatus has the function of adjusting registration error.
The adjustment amount of storage registration error in registration adjustment amount tables of data.The described registration adjustment amount tables of data of storage in system storage 42.Figure 29 is the schematic diagram of the example of registration adjustment amount tables of data.In described example, registration adjustment amount tables of data comprises registration adjustment amount data, standard registration adjustment amount data and has printed the paper registration adjustment amount data of pattern.Standard registration adjustment amount data are the data about the standard adjustment amount of registration.Register (register) described standard registration adjustment amount data by for example attendant.On the other hand, can at random register the paper registration adjustment amount data of having printed pattern by the user.Preferably these registration adjustment amount data are set according to each pallet.And, as the paper registration adjustment amount data of having printed pattern, can store deviate with respect to standard registration adjustment amount.
The paper registration adjustment amount of Figure 30 A-30C is the printing that shows on operation display unit 43 pattern is provided with the schematic diagram of the example of screen.The user is by specifying the setting of registration adjustment amount at the screen shown in Figure 30 A, and presses " OK " button, makes to occur at the screen shown in Figure 30 B.The user is by selecting pallet 3 (wherein comprising the paper of having printed pattern) at the screen shown in Figure 30 B, and presses " OK " button, makes to occur at the screen shown in Figure 30 C.The user uses numeric keypad to import specific registration adjustment amount, so that the registration adjustment amount is set.
The registration adjustment amount that is provided with by the user is stored in as the paper registration adjustment amount data (according to each pallet) of having printed pattern in the registration adjustment amount tables of data that is stored in the system storage 42.
Figure 31 is carried out, is used to be provided with the flow chart of example of the processing of registration adjustment amount by image forming apparatus.
Check that the paper that user whether will print pattern is appointed as print paper (step S801).When the paper that also will not print pattern as the user is appointed as print paper, when promptly print paper is not the paper of having printed pattern (step S801 not), obtain standard registration adjustment amount (step S802) from registration adjustment amount tables of data.Image forming apparatus is carried out print job (step S803) according to the registration adjustment amount that is obtained.
When the paper that will print pattern as the user is appointed as print paper (at step S801 be), obtain the paper registration adjustment amount (step S804) of having printed pattern from registration adjustment amount tables of data.Processing controls proceeds to step S803, and image forming apparatus is carried out print job according to the registration adjustment amount that is obtained.
By using said method, might prevent that following problems from appearring in image forming apparatus: the part of image is not printed on the paper, perhaps image is not printed on the appointed area of paper, because described image accurately is not printed in the print area.
In addition, image forming apparatus is print image on paper correctly, and promptly the part of image is printed on the conveyer belt and never takes place, and makes to prevent that conveyer belt from being polluted by China ink.Therefore, might prevent the lift behavior of paper, because the electrostatic force that acts on the paper does not reduce from conveyer belt.Therefore, the surface of the paper printhead that do not rub makes to prevent following problems: the fuzzy or printhead of print image is damaged.
Paper PP does not measure in the paper feeding pallet usually in the length on the sub scanning direction, measures and be to use such as the common sensor of paper sensor 17 or the sensor (not shown) that just provides after transfer roller piece 4.
In the present embodiment, when will be on the paper of having printed pattern during print image, do not detect the fore-end of the paper of having printed pattern.Therefore, the size of having printed the paper of pattern on user error ground is set under the situation of the size bigger than actual size, and according to layout, print image may be run out of from the paper of having printed pattern, and promptly conveyer belt 20 may be polluted by China ink.
For fear of such situation,, switch each of paper sensor 6,11 and 16, so that detect the length of paper on sub scanning direction of having printed pattern when will be on the paper of having printed pattern during print image.Therefore, even when the user is provided with the paper of having printed pattern big or small improperly, also can find big minor error (error) in early days.
For example, according to the duration of paper " under any one state that is switched in the paper sensor 6,11 and 16 that the paper of having printed pattern at first passes through transmit " and " speed of transmission paper ", can obtain to have printed the length of the paper of pattern.If it is right to use stepper motor to drive many each in transfer roller 3,9 and 14, then can calculate the length of the paper of having printed pattern according to the driving amount of stepper motor.
When detecting the possibility of big minor error, system's cancellation print job.As the method that is used to cancel print job, there is such operation: " stopping the transmission of paper "; " even image is not printed on fully also cancels print job on the paper, and discharges described paper "; And " if begun print job (being that conveyer belt 20 might be polluted by China ink), then stop the transmission of paper, and if also do not have print job (being that conveyer belt 20 is not polluted by China ink), then discharge not the paper blank of print image thereon ".
Figure 32 is the flow chart of the example of the processing carried out by image forming apparatus when big minor error occurring.
Check that the paper that user whether will print pattern is appointed as print paper (step S901).When the paper that also will not print pattern as the user is appointed as print paper, when promptly print paper is not the paper of having printed pattern (step S901 not), system uses the length (step S902) of common sensor measurement paper on sub scanning direction.Image forming apparatus is carried out print job (step S903) according to measured yardage.
When the paper that will print pattern as the user is appointed as print paper (at step S901 be), system uses in the paper sensor 6,11 and 16 that the paper of having printed pattern at first passes through any one to measure the length (step S904) of paper on sub scanning direction of having printed pattern.At this moment, if detect the appearance (at step S905 be) of big minor error, then print job (step S906) is carried out in the image forming apparatus cancellation.
If do not occur big minor error (step S905 not), then processing controls proceeds to step S903, and image forming apparatus is carried out print job according to the length of the paper of measuring at step S904.
In said method,, do not detect the fore-end of the paper of having printed pattern when will be on the paper of having printed pattern during print image.Therefore, when coming the detected magnitude mistake according to the length of the paper of having printed pattern on sub scanning direction, image forming apparatus can begin to carry out print job according to the size of the paper of having printed pattern.In this case, the width of paper on main scanning direction of having printed pattern might also be provided with improperly.Particularly, when the developed width of the paper of having printed pattern on main scanning direction less than when setting value, conveyer belt 20 is polluted by China ink probably.
For example, though in fact the user should vertically be set to A3 the size of print paper, but when user error A4 is set when vertical, image forming apparatus begins to carry out print job before the length in the length on the sub scanning direction less than A4 longitudinally detecting paper.If image extends across the whole width of the paper on main scanning direction, then print image is run out of from paper, and promptly conveyer belt 20 is polluted by China ink.
Therefore, when detecting big minor error, system identification goes out to need clean belt 20, and stops the transmission of aforesaid paper.Then, the user after internal system removes paper, clean belt 20.Perhaps, after all paper discharges that internal system is transmitted, clean belt 20.
Figure 33 is by the flow chart of the example of the processing of image forming apparatus processing that carry out, that comprise clean belt 20 when big minor error occurring.
Check that the paper that user whether will print pattern is appointed as print paper (step S1001).When the paper that also will not print pattern as the user is appointed as print paper, when promptly print paper is not the paper of having printed pattern (step S1001 not), system uses the length (step S1002) of common sensor measurement paper on sub scanning direction.Then, image forming apparatus is carried out print job (step S1003) according to measured yardage.
When the paper that will print pattern as the user is appointed as print paper (at step S1001 be), described system uses in the paper sensor 6,11 and 16 that the paper of having printed pattern at first passes through any one to measure the length (step S1004) of paper on sub scanning direction of having printed pattern.At this moment, if detect the appearance (at step S1005 be) of big minor error, then print job (step S1006) is carried out in the image forming apparatus cancellation.
Then, determine whether to have image according to aforesaid standard and be printed on the conveyer belt 20, promptly printed any possibility (step S1007) of the developed width of paper on main scanning direction of pattern less than setting value.When existing image to be printed on possibility on the conveyer belt 20 (at step S1007 be), cleaning unit 28 clean belt 20 (step S1008).On the other hand, when not existing image to be printed on possibility on the conveyer belt 20 (step S1007 not), processing controls skips steps S1008.
If do not occur big minor error (step S1005 not), then processing controls proceeds to step S1003, and image forming apparatus is carried out print job according to the length of the paper of measuring at step S1004.
By this way, in image forming apparatus according to second embodiment, when the paper that will print pattern is chosen as print paper, according to the printing that on conveyer belt 20, transmits after the travel distance of paper of pattern detects the position of fore-end of the paper of having printed pattern, print image on the paper of having printed pattern.Therefore, print image on the appointed area of the paper of having printed pattern correctly.
Incidentally, in first and second embodiment, paper PP sticks on the surface of conveyer belt 20 by using electrostatic force.Perhaps, can make micropore (microscopic hole) in conveyer belt 20, the feasible suction fan that utilizes is next air-breathing by described hole, and paper PP can stick on the surface of conveyer belt 20 by the suction that uses suction fan thus.
In addition, in first and second embodiment, use photoelectric detector to detect the position of the front-end and back-end part of the position of the right-hand member of paper PP and left end portion and paper PP.Perhaps, can use charge-coupled device (CCD) to replace photoelectric sensor.
According to an aspect of the present invention, when the paper that will print pattern is chosen as print paper, obtains to have printed the right-hand member of paper of pattern and the position of left end portion by paper size data and determine print area according to storage in advance.Therefore, can be correctly on the paper of having printed pattern in print area print image.
In addition, according to another aspect of the present invention, when the paper that will print pattern is chosen as print paper, according to the printing that on conveyer belt, transmits the travel distance of paper of pattern determined to print the position of fore-end of the paper of pattern.Therefore, print image on the appointed area of the paper of having printed pattern correctly.
Though described the present invention at specific embodiment clearly open to carry out complete sum, but claims are therefore not limited, and (fairly) falls into all modifications and alternative constructions basic instruction set forth herein, that those skilled in the art can expect but should be interpreted as comprising fully.

Claims (9)

1. image forming apparatus comprises:
Conveyer belt, it is uploaded paper feeding at sub scanning direction and opens;
Sensor, it is reciprocal on main scanning direction, to detect the side part of paper;
Printhead, it is installed on the carriage, and described carriage is reciprocal on main scanning direction;
The paper information acquiring unit, it obtains the paper information of the type and size that comprise described paper;
Positional information storage unit, store therein corresponding to the size of described paper, about the positional information of the side locations of the paper on the conveyer belt; And
Control module, when its type at described paper is the paper of having printed pattern, not according to the side part that is detected by the paper that described sensor detected, but according to controlling the printing of being undertaken by printhead with the big or small corresponding described positional information of described paper.
2. according to the image forming apparatus of claim 1, wherein, the reflectivity on surface that transmits the conveyer belt of paper thereon is lower than the reflectivity of described paper.
3. according to the image forming apparatus of claim 1, also comprise: the margin memory cell, store the margin of the print area of the described paper of having printed pattern therein, wherein
Described control is printed also according to controlling printing at the margin of margin memory cell storage.
4. according to the image forming apparatus of claim 1, also comprise: the ratio memory cell, the ratio of storing the print area of the described paper of having printed pattern therein, wherein
Described control module is also according to controlling printing in the ratio of ratio memory cell storage.
5. according to the image forming apparatus of claim 1, wherein, described sensor is installed on the carriage.
6. according to the image forming apparatus of claim 1, wherein, described conveyer belt transmits described paper in its surface by utilizing electrostatic force that described paper is adhered to.
7. according to the image forming apparatus of claim 1, wherein, described sensor is a reflective photoelectric sensor.
8. according to the image forming apparatus of claim 1, also comprise: cleaning unit, it cleans described conveyer belt.
9. image forming method that is used for image forming apparatus, described image forming apparatus comprises positional information storage unit, in this positional information storage unit storage corresponding to the size of the paper on the conveyer belt, about the positional information of the side locations of this paper.Described image forming method comprises:
Obtain the paper information of the type and size that comprise described paper;
On sub scanning direction, transmit described paper;
Detect the side position of described paper on main scanning direction;
Print image on described paper; And,
When the type of described paper is the paper of having printed pattern, not according to the side part that is detected by the paper that described sensor detected, but according to controlling printing with the big or small corresponding positional information of described paper.
CN2008101619085A 2007-10-05 2008-09-27 Image forming apparatus and image forming method Expired - Fee Related CN101402290B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP261809/07 2007-10-05
JP2007261809 2007-10-05
JP208136/08 2008-08-12
JP2008208136A JP5326418B2 (en) 2007-10-05 2008-08-12 Image forming apparatus and image forming method

Publications (2)

Publication Number Publication Date
CN101402290A CN101402290A (en) 2009-04-08
CN101402290B true CN101402290B (en) 2010-12-01

Family

ID=40536509

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2008101619085A Expired - Fee Related CN101402290B (en) 2007-10-05 2008-09-27 Image forming apparatus and image forming method

Country Status (2)

Country Link
JP (1) JP5326418B2 (en)
CN (1) CN101402290B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4902764B2 (en) 2009-05-15 2012-03-21 キヤノン株式会社 Paper feeding method of printing device
US20110043562A1 (en) * 2009-08-24 2011-02-24 Kabushiki Kaisha Toshiba Inkjet recording apparatus
JP5604287B2 (en) * 2010-12-22 2014-10-08 理想科学工業株式会社 Image forming apparatus
JP2014188930A (en) * 2013-03-28 2014-10-06 Seiko Epson Corp Printer controller, printer, and print method
JP6117657B2 (en) * 2013-09-05 2017-04-19 株式会社ミマキエンジニアリング Printing control apparatus, printing apparatus, program, and recording medium
JP6528944B2 (en) * 2015-05-28 2019-06-12 セイコーエプソン株式会社 Liquid discharge device
JP6528946B2 (en) * 2015-05-28 2019-06-12 セイコーエプソン株式会社 Liquid discharge device
JP6528945B2 (en) * 2015-05-28 2019-06-12 セイコーエプソン株式会社 Liquid discharge device
JP2018197788A (en) * 2017-05-23 2018-12-13 コニカミノルタ株式会社 Image forming method and image forming system
CN115107382A (en) * 2022-07-25 2022-09-27 上海商米科技集团股份有限公司 Photoelectric sensing device of printer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3125906B2 (en) * 1993-05-14 2001-01-22 シャープ株式会社 Document processing device with item area designation function
JP3941680B2 (en) * 2002-11-29 2007-07-04 ブラザー工業株式会社 Medium edge setting device and image forming apparatus using the edge setting device
JP2004351837A (en) * 2003-05-30 2004-12-16 Ricoh Co Ltd Image forming apparatus
JP2005283675A (en) * 2004-03-26 2005-10-13 Konica Minolta Business Technologies Inc Image forming apparatus
JP2006044101A (en) * 2004-08-05 2006-02-16 Olympus Corp Image forming apparatus and method for detecting right/left end position of image forming medium
JP4588462B2 (en) * 2005-01-12 2010-12-01 株式会社リコー Image forming apparatus
JP4688187B2 (en) * 2005-02-16 2011-05-25 株式会社リコー Image forming apparatus

Also Published As

Publication number Publication date
CN101402290A (en) 2009-04-08
JP2009101681A (en) 2009-05-14
JP5326418B2 (en) 2013-10-30

Similar Documents

Publication Publication Date Title
CN101402290B (en) Image forming apparatus and image forming method
CN102189779B (en) Double-face print control method and print apparatus
US8113644B2 (en) Image forming apparatus and image forming method
US7871158B2 (en) Image forming apparatus and method for controlling the image forming apparatus
US20070040326A1 (en) Sheet supplying unit and sheet width detecting unit
EP1666980A2 (en) Image forming system, image forming device, post-processor and program
EP1939005A1 (en) Synchronisation of front and back side printing in double sided inkjet web printing
JPH0881121A (en) Document processor
US9460374B2 (en) Printer and printer control method
CN101875265A (en) Printing system, printing device, and printer driver
US7665731B2 (en) Sheet conveying device
US8690315B2 (en) Image recording apparatus and image recording method
CN102616019B (en) Printing control apparatus and printing control method
CN100488780C (en) Recording device
US9090416B2 (en) Paper feed apparatus, image forming apparatus and image forming system
US7164881B2 (en) Apparatus and method for establishing a default media size for an imaging device
US8552879B2 (en) Method and apparatus for determining the amount of media on an elevator that supports a media stack in an image production device
US8313187B2 (en) Modular RFID imaging device option
CN103365145B (en) Image processing system
CN101526769A (en) Post-processing apparatus
US20100259797A1 (en) Image reading apparatus and method, and storage medium
JP2003137444A (en) Paper feeding device
US8505907B2 (en) Method and apparatus for determining the position of adjustable feeder tray side guides in an image production device
JP2003192189A (en) Paper feeding device and image formation device provided with the same
JP2009267654A (en) Image forming apparatus

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101201

Termination date: 20140927

EXPY Termination of patent right or utility model