CN100370366C - Image forming apparatus capable of regulating paper transmission time - Google Patents
Image forming apparatus capable of regulating paper transmission time Download PDFInfo
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- CN100370366C CN100370366C CNB021574758A CN02157475A CN100370366C CN 100370366 C CN100370366 C CN 100370366C CN B021574758 A CNB021574758 A CN B021574758A CN 02157475 A CN02157475 A CN 02157475A CN 100370366 C CN100370366 C CN 100370366C
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Abstract
An image forming device having a sheet conveying path extending from a feeder unit to an image forming unit. In the feeder unit, a sheet supply roller is rotated at a peripheral speed Vs. A convey roller positioned immediately downstream of the sheet supply roller is rotated at a peripheral speed V3 lower than Vs. Additional convey roller positioned immediately downstream of the first convey roller it rotated at a peripheral sped V2 lower than V3. A register roller positioned downstream of the second convey roller is rotated at a peripheral speed V1 lower than V2. A transfer roller of the image forming unit is rotated at a peripheral speed V0 lower than V1. Bach convey roller, the register roller, the sheet supply roller is connected to each clutch. Sheet sensors are provided each positioned between neighboring rollers for detecting a leading edge of the sheet. Upon detection of the leading edge by one of the sensors, the roller positioned immediately upstream of the one of the sensors is shifted to its non-driving state by the clutch associated therewith.
Description
Technical field
The present invention relates to a kind of electricity seal (electrophoto-graphic) formula image forming apparatus that is used for laser printer, photoprinter, facsimile recorder and similar devices.
Background technology
For example in open Japanese patent application notification number HEI-10-35941, just disclosed a kind of traditional electrical seal formula image forming apparatus such as laser printer.In such image forming apparatus, when a recording medium passed between a transfer roll and sensitization tube, the toner figure that is formed on the sensitization tube just was transferred on a paper or another recording medium.Then, recording medium passes between a single warm-up mill and a single backer roll, toner is heated melt and toner image is fixed on the surface of recording medium.A paper feeding unit is set, is used for a ground feeding to be stacked on recording medium in the paper feeding pallet.From paper feeding unit this recording medium is passed through the image forming portion that the relative transfer roll of this transmission path to one sensitization tube is placed by a paper feeding roller that is provided with along a transmission paths, a plurality of intermediate conveyor roller and alignment roller.When many intermediate conveyor rollers rotate, the intermittently-driving alignment roller.When medium during by all delivery roll feedings, the leading edge of image recording media abuts against on the alignment roller that stops, so that the zone line of recording medium can be crooked.As a result, just leading edge can be positioned on the suitable direction, also can regulate to the supply time of image forming portion simultaneously medium.
When on many recording mediums, forming image continuously, be provided with as follows from paper feeding unit and begin to supply second and time of follow-up paper.If the leading edge of the tail end limit of last paper and back one paper leans on too closely, because leading edge position inhomogeneous of paper in the paper feeding pallet, the leading edge of back one paper just may just arrive along a paper sensor of the transmission path setting of sending the unit from paper feeding unit to before passing completely through sensor detecting last paper.Under one situation of back, just make not feeding of paper the preceding but the judgement of staying the paper sensor position, therefore will carry out a fault processing of following paper to box-up irrelevantly.
Feeding before if follow-up paper separates from the paper feeding roller in the tail end limit of preceding paper, just undesired to some extent power is applied on the paper of front, and this can reduce the transmission performance of paper.For fear of this problem, generally will supply between the leading edge of the tail end limit that is arranged in last paper the zero hour of paper and back one paper the interval of an ormal weight will be provided, for example about 60 millimeters, and the image transitions period also taken into account.
In order to supply each paper from paper feeding unit, use a friction separating mechanism to come from the stacker of remainder is opened, to separate a piece of paper and open.Such friction separating mechanism adopts a separating pad that is pressed against on the paper feeding roller to produce the friction force that is used to separate paper.But the paper leading edge in paper feeding unit can become uneven sometimes.When using such friction separating mechanism, because the top paper and the effect followed the preceding in the paper feeding pallet than the tractive force between the paper of below, when paper transmitted in front, back one paper just can be resisted the friction force between paper feeding roller and the friction separating pad and move along transmission direction.In this case, follow-up paper just stops when the paper feeding roller has stopped, and its leading edge turns to the downstream of transmission direction from a reference point at the paper feeding roller and the clamping zone between the separating pad that rubs.
If the paper of back stops and its leading edge turns to the downstream too many from the reference point at clamping zone when the paper feed roller stops, just can't satisfying the desired condition that between adjacent paper, keeps a predetermined distance.Therefore, when driving the paper feeding roller and rotate a schedule time that is designed to keep one predetermined distance between paper, paper sensor may detect a paper and be box-uped, perhaps the view data distribution time enough that can't will print for conversion.
Summary of the invention
The invention provides a kind of image forming apparatus that is used for forming image on the image recording media of well cutting, it comprises a drive source, a paper feeding unit, image formation unit, a transmission paths and at least two paper transmission unit.In paper feeding unit, stored a folded image recording media.At the image formation unit place, on image recording media, form a visual image.Transmission path extends between paper feeding unit and image formation unit.Each image recording media passes transmission path and is transferred to image formation unit with transmission direction from the paper feed unit.At least two transmission unit links to each other with drive source, and comprises the transmission unit in a downstream and the transmission unit of a upstream side.The transmission unit in downstream is arranged along transmission path and is used for one first transmission speed images recording medium.The transmission unit of upstream side arranges along transmission path, and the upstream that is positioned at the downstream transmission unit in transmission direction is used for the second transmission speed images recording medium greater than first transmission speed.
In one embodiment, image processing system also comprises at least two clutch couplinges and controller of a first clutch and a second clutch.First clutch is connected between drive source and the downstream paper transmission unit, and provides a "on" position that drives the downstream transmission unit and one to cut off the off-position that the electric power of side transmission unit downstream transmits.Second clutch is connected between drive source and the upstream side paper transmission unit, and provides a "on" position that drives the upstream side transmission unit and one to cut off the off-position that the electric power of side transmission unit upstream transmits.Controller is controlled these at least two clutch couplinges so that provide off-position in the upstream side transmission unit when the downstream paper transmission unit is clamped a leading edge part of image recording media.
In another aspect of this invention, provide a kind of being used for to form the image forming apparatus that forms image on the medium at the image of well cutting, it comprises that one provides the drive source of driving force, a paper feed unit, image formation unit, a transmission paths, first a paper delivery roll, a first clutch, a second clutch and a controller.Paper feeding unit comprises that many image recording medias are stacked into the paper storage area of a quires therein.The paper feeding roller is suitable for isolating an image recording media and along the isolated image recording media of paper feed direction feeding from a quires of remainder.At the image formation unit place, on image recording media, form a visual image.Image formation unit comprises that one is loaded with one and is used for the developer image is transferred to transfer roll on the image recording media as the dive Electrifier frame, photoreceptor of image and one of the static that wherein is loaded with developer of developer image.Transmission path extends between paper feeding unit and image formation unit.Each image recording media passes transmission path and is transferred to image formation unit with direction of feed from the paper feed unit.The first paper delivery roll is along the transmission path layout and between paper feeding roller and transfer roll.The peripheral speed of the first paper delivery roll is less than the speed of paper feeding roller and greater than the speed of transfer roll.First clutch is connected on the first paper delivery roll selectively to transmit the driving force of power supply to the first paper delivery roll.First clutch provides "on" position that drives the first paper delivery roll and the off-position that stops the first paper delivery roll.Second clutch is connected on the paper feeding roller selectively to transmit the driving force of power supply to the paper feeding roller.Controller comprises breaker device and drives starting apparatus.The tail end limit that breaker device is provided at the previous image recording medium moves through first paper delivery roll off-position afterwards, so that the leading edge and the first paper delivery roll adjacency that stops of back one image recording media, with the interval between the leading edge of the tail end limit of paper before being adjusted at and follow-up paper.Drive starting apparatus, after adjusting at interval, make first clutch be in "on" position to begin to drive the rotation of the first paper delivery roll.
The accompanying drawing summary
In these figure:
Fig. 1 is the sectional view of expression according to a laser printer ordinary construction of first embodiment of the invention;
Fig. 2 is the synoptic diagram of expression according to paper transport path and the paper transmission unit of first embodiment;
Fig. 3 is the electric power connecting gear that to paper transmission unit transmit driving force of expression according to first embodiment;
Fig. 4 is the side view that is illustrated in a clutch coupling that is used for driving off and on a paper feeding roller among first embodiment;
Fig. 5 is the stereographic map of an expression clutch coupling shown in Figure 4;
Fig. 6 is the block scheme that is illustrated in the function of a controller among first embodiment;
Fig. 7 roughly represents the process flow diagram according to the control procedure of first embodiment;
Fig. 8 is expression according to the time diagram of the driving time of the detection time of each sensor of first embodiment and each transmission unit;
Fig. 9 is the process flow diagram of roughly representing according to a control procedure of second embodiment of the invention;
Figure 10 is expression according to the time diagram of the driving time of the detection time of each sensor of second embodiment and each transmission unit;
Figure 11 (a) is at the side view according to a paper leading edge adjustment unit in the image forming apparatus of third embodiment of the invention;
Figure 11 (b) is the planimetric map of expression according to the geometric position of a pair of paper leading edge adjustment unit of the 3rd embodiment;
Figure 12 is the block scheme that is illustrated in the function of a controller among the 3rd embodiment;
Figure 13 represents that roughly according to the 3rd embodiment one is used for controlling the process flow diagram of the control procedure of paper leading edge position; And
Figure 14 is expression according to the 3rd embodiment with according to its paper transmission time of a modification and the time diagram that the leading edge position concerned between the adjustment time.
Embodiment
With reference to Fig. 1 to 8, an image forming apparatus according to first embodiment of the invention is described below.Following description relates to one and implements laser printer 1 of the present invention.As shown in fig. 1, laser printer 1 comprises a main casing 2.Have in the main casing 2 and a plurality ofly be used for supplying feed unit 4 as the paper 3 of recording medium, one and be used for forming the image formation unit 5 of specified image and one and be used for image is fixed to fixed cell 19 on the paper at the paper 3 that comes from feed unit 4 feedings.
Each feed unit 4 is provided with a paper feeding pallet 6 that is removably mounted on main casing 2 bottoms,, a paper pressing plate 8 that is located at paper feeding pallet 6 inside, an and paper feeding roller 12 and place top and the separating pad 13 on an end of paper feeding pallet 6.One transmission paths 7 forms a curve as illustrated in fig. 1, by this transmission paths 7 paper 3 is transferred to image from paper feeding roller 12 and forms position (contact point between a sensitization tube 23 and transfer roll 25, that is transfer position).Order from upstream extremity, be provided with as a paper feeding roller 12 of the 4th transmission unit, as a pair of intermediate conveyor roller 11 of the 3rd transmission unit with as a pair of intermediate conveyor roller 10 of second transmission unit with suitable interval along transmission path 7, and as just placing image to form before the position and an alignment roller 9 of first transmission unit in intermediate conveyor roller 10 downstreams in transmission direction.
Leave the end of paper feeding roller 12 pressing plate 8 farthest and support pivotly, so that the end of the most close paper feeding roller 12 can move up and down.Place a spring 8a on pressing plate 8 downsides that the free end of pressing plate 8 is made progress.Paper feeding roller 12 and separating pad 13 are staggered relatively.Separating pad 13 comprises the separating pad 13a that a pad supports part 13c, place spring 13b on the pad supports part 13c downside and to have big friction factor, exert pressure by the pressure of spring 13b on paper feeding roller 12.Adjoining position is as a paper feeding position between paper feeding roller 12 and the separating pad 13a.
Shorter at width dimensions than the width of paper 3 perpendicular to separating pad 13a in the transmission direction and paper feeding roller 12.When transmission paper 3,12 central parts that approximately contact paper 3 Widths of separating pad 13a and paper feeding roller.
Be layered in going up most and being pressed towards paper feeding roller 12 of paper 3 on the pressing plate 8.The rotation of paper feeding roller 12 causes on ground of individual paper that this stacker is opened the top and enters between paper feeding roller 12 and the separating pad 13.Then, individual paper 3 between paper feeding roller 12 and separating pad 13 just is transferred to intermediate conveyor roller 10 and alignment roller 9 successively by intermediate conveyor roller 11.After having carried out suitable alignment by alignment roller 9, paper 3 just is transferred to image and forms the position.
The position of one side of main casing 2 above top feed unit 4 is provided with the multi-functional pallet 14 and the multi-functional paper feeding unit 15 that are used for manual supply paper 3.Unit 15 comprises that a multi-functional feed rolls 15a, one are used for feeding and are stacked on Multi-function cushion 15b and the spring 15c of the paper 3 in the multipurpose tray 14.Spring 15c is placed on the downside of Multi-function cushion 15b Multi-function cushion 15b is pressed to multi-functional paper feed rolls 15a.When a paper 3 that is stacked on the multipurpose tray 14 enters between the multi-functional paper feed rolls 15a of rotation and the Multi-function cushion 15b, be transferred to alignment roller 9 by a pair of transmission roller 16 once individual paper.
Machining cell 18 comprises a tube box and a Developing box 24.The sensitization tube 23 as Electrifier frame, photoreceptor, 37 and transfer rolls 25 of charging device (scorotoron charger) in the tube box, have been assembled as transfer device.Developing box 24 is removably mounted on the box.Developing box 24 comprises that a unit that holds toner 26, one adjust blade 28 and a toner feed rolls 29 as the developing roll 27 of display, a toner thickness.
Hold toner unit 26 and be filled with a kind of developer, this developer is a kind of condensate toner of positively charged, non magnetic, one-component in the present embodiment.Toner is fed to developing roll 27 by toner feed rolls 29, and by the friction that produces between toner feed rolls 29 and the developing roll 27 lotus that becomes positively charged.When developing roll 27 rotates, toner thickness adjust blade 28 just scraped on the developing roll 27 with toner, thereby on the surface of developing roll 27, form the uniform toner thin layer of thickness.The sensitization tube 23 that rotates is placed on and developing roll 27 opposite positions and ground connection.There is the photographic layer of a positively charged polycarbonate or other organic photo material on the surface of sensitization tube 23.
In such laser printer 1, remain in sensitization tube 23 lip-deep residue toners and regain by developing roll 27 after sensitization tube 23 is transferred to paper 3 by transfer roll 25 at toner image.This toner is collected the method that is also referred to as no remover.Be retracted in sensitization tube 23 surfaces by the method for using this no remover and go up remaining toner, just need not to provide a blade or other cleaning device, also need not to be used for collecting the memory storage of waste toner, thereby simplified the structure of equipment and helped the reduction with cost of reducing of size.
When sensitization tube 23 rotated, the whole surface that charging device 37 just crosses sensitization tube 23 produced positive charge.Therefore, the surface of sensitization tube 23 just is exposed under the high-velocity scanning of the laser beam of launching from scanning element 17, and forms the static image of diving from the teeth outwards based on the view data of regulation.
Then, the lip-deep positively charged toner at developing roll 27 just contacts with sensitization tube 23 when developing roll 27 rotates.Simultaneously, thereby be exposed under the laser beam and on than the low part of the remainder electromotive force on homogeneous band electric charge surface the time, be formed on the sensitization tube 23 lip-deep static image of diving and just be transformed into visual picture when toner selectively is attracted to sensitization tube 23.An inverted image (toner image) just forms by this way.
Then, as shown in Figure 1, fixed cell 19 is arranged in the side and the downstream of machining cell 18.Fixed cell 19 comprises the backer roll 32 that a single warm-up mill 31, are exerted pressure to single warm-up mill 33 and is arranged in single warm-up mill 31 and a pair of delivery roll 31 in backer roll 32 downstreams.Single warm-up mill 31 is made by aluminium or other metal material, and is provided with a Halogen lamp LED or other heating arrangement.When passing, fixed by paper 3 toner that machining cell 18, is transferred on the paper 3 from the heat of single warm-up mill 31 between single warm-up mill 31 and backer roll 32.Therefore, delivery roll 33, a pair of delivery roll 34 and a pair of paper at transmission path are sent the outlet roller 35 transmission paper 3 of end, and paper 3 passed out to send on the pallet 36.
In the present embodiment, laser printer 1 is provided with a loopback cell 41, forms image with the back side at paper 3.Loopback cell 41 is made of a reversing-gear 42 and loopback pallet 43 integral body.Reversing-gear 42 links to each other with the rear end of main casing 2, and the pallet of loopback simultaneously 43 is removably mounted in the main casing 2 and can be inserted in the top of top feed unit 4.
Reversing-gear 42 comprises that an xsect is roughly the box body 44 of rectangle.Box body 44 is installed in the outside of the rear panel of main casing 2.Reversing-gear 42 also comprises a catch 45, a pair of reverse rollers 46 and a pair of stripper rolls 47 that is arranged in box body 44 inside.Reverse guide plate 48 raises up from the top of box body 44.Loopback cell 41 also comprises a pallet 50, tilting roller 51, a shaped form guide plate 52 and a loopback guide plate 53.
Catch 45 pivots and movably is arranged in main casing 2 rear portions near the delivery roll 33 and is positioned at its downstream.When an o (not shown) an energising or outage, on the one side surface, be formed with image and by the paper 3 of delivery roll 33 transmission just can selectively lead delivery roll 34 or reverse rollers 46.When the paper 3 that a side printed is sent to when sending pallet 36, catch 45 just moves on pivotally.When the both sides of print paper 3, catch 45 just moves to reverse rollers 46 pivotally.Reverse rollers 46 can forward and rotate backward.When paper 3 was between this is to reverse rollers 46, reverse rollers 46 was rotated forward earlier, and paper 3 is transmitted to reverse guide plate 48.Then, back kick is passed to stripper rolls 47 to paper 3 by the backward rotation of reverse rollers 46.Stripper rolls 47 is along a shaped form guide plate in loopback pallet 43 52 transmission paper 3 and being transferred on the pallet 50 downwards.Tilting roller 51 at pallet 50 tops transmits paper 3 along pallet 50, and keeps the side of paper 3 to contact with an alignment plate (not shown) simultaneously.Paper 3 transmits through loopback guide plate 53 gets back to intermediate conveyor roller 10.By this process, with regard to reverse paper 3 so that its on the unprinted surface, position of intermediate conveyor roller 10 and alignment roller 9 upwards.Therefore, when paper 3 forms the position through out-of-date from image, just can form image at the back side of paper 3.
Below with reference to Fig. 2, be described extend to the part that image forms the sheet conveying path 7 of position from paper feeding roller 12 as the 4th transmission unit.A pair of shaped form guide plate 7a, 7b are set to determine forming curve sheet conveying path 7 between the position at the paper feeding position at form feeder 4 places of the top and image.The main surface of each guide plate 7a, 7b and paper 3 become towards relation to guide the transmission of paper 3.The 3rd transmission unit 11 that comprises a drive roll 11a and a driven voller 11b is positioned at adjacent with paper feeding roller 12 and on the position in its downstream.Second transmission unit 10 that comprises a drive roll 10a and a driven voller 10b is positioned at adjacent with the 3rd transmission unit 11 and on the position in its downstream.Be arranged in adjacent and on the position in its downstream as an alignment roller 9 of first transmission unit that comprises a drive roll 9a and a driven voller 9b with second transmission unit 10.Be provided with an alignment roller sensor 56 as first paper sensor in the upstream of alignment roller 9 with being right after, be provided with one second paper sensor 55 in the upstream of delivery roll 10 with being right after, and be provided with one the 3rd paper sensor 54 with being right after in the upstream of delivery roll 11.Be provided with an image timer 57 in the downstream that is right after of alignment roller 9.
Each sensor 54,55,56 and 57 all is provided with pivotal axis 54a, a 55a, 56a, 57a; Rodmeter 54b, a 55b, 56b, 57b, this bar pivot is bearing on the pivotal axis with changeing, and can be along with each a end and the adjacency of paper leading edge and moving; And fixing detecting device 54c, 55c, 56c, a 57c, be used for the position separately of each the other end of detecting sensor bar 54b, 55b, 56b, 57b arriving a precalculated position with leading edge and detecting to paper 3.Can be used as each detecting device 54c, 55c, 56c, 57c with a light blockout device.
This comprises a drive roll and a driven voller to delivery roll 16.In addition, this to the upstream arrangement that is right after of delivery roll 16 one the 4th paper sensor (not shown).The structure of the 4th paper sensor is identical with the structure of each sensor 54 to 57.
Fig. 3 shows a train that is used for driving paper feeding roller 12 and sensitization tube 23, comprises drive roll 9a, 10a, 11a.This train comprises that one first train 62, one second train 64, a third round are that 65, four-wheels are 67 and one the 5th trains 68.First train 62 is used to drive and a paper feeding roller 12 that gear 62i is coaxial.It is coaxial that one first driving motor 63 is set to a pinion wheel 63a, and this pinion wheel 63a and one are set to and the public transmission gear 62a engagement that public transmission gear 62b is coaxial.This public transmission gear 62b and a gear 62c engagement, gear 62c and a gear 62d are coaxial, gear 62d and a gear 62e engagement, gear 62e and a gear 62f engagement, gear 62f and jagged gear 62g, 62h engagement, and gear 62g, 62h mesh with gear 62i and are used to drive paper feeding roller 12.
Second train 64 comprises one and common gear 62b meshed gears 64a.Gear 64a meshes in a gear 64b, and gear 64b and the axle with drive roll 11a are coaxial to rotate the gear 64c engagement of drive roll 11a on clockwise direction shown in Figure 3.Third round is 65 to be used to drive drive roll 10a, it comprise one with gear 64c meshed gears 65a.Gear 65a and a gear 65b engagement, gear 65b and a gear 65c engagement, gear 65c and the coaxial gear 65d engagement of rotating drive roll 10a with the clockwise direction in Fig. 3 of the axle with drive roll 10a.
Be provided with second driving motor 66 that has a pinion wheel 66a for driving sensitization tube 23.Four-wheel be 67 comprise one with pinion wheel 66a meshed gears 67a.Four-wheel is 67 also to comprise a gear 67b and a gear 67c coaxial with the driving shaft of sensitization tube 23.The 5th train 68 is used to drive drive roll 9a, and it comprises one and gear 67a meshed gears 68a.The 5th train 68 also comprise a gear 68b and one and gear 68b engagement and with the coaxial gear 68c of axle of the drive roll 9a of alignment roller 9.
Be provided with one with first clutch 82 as alignment roller 9 associated of first transmission unit, one with second clutch 81 as delivery roll 10 associated of second transmission unit, and three-clutch 80 with delivery roll 11 associated that are used as the 3rd transmission unit.These clutch couplinges the 82,81, the 80th, electromagnetic clutch.The on-state of each electromagnetic clutch provides a power supply delivery status, and its off-position provides a power-off state, drive roll 9a, 10a, 11a and driven voller 9b, 10b, the 11b idle running of being correlated with under power-off state.
First and second driving motors 63 and 66 rotating speed, and the reduction gear ratio of above-mentioned train 62 to 68 and these rollers 9,10,11,12 diameter is designed to have following length velocity relation: if in the peripheral speed of the sensitization tube 23 at the contact area place of sensitization tube 23 and transfer roll 25 diameters, that is the transmission speed of paper, be V0, alignment roller (first transmission unit) 9 just provides a paper transmission speed V1 (V1=1.15V0) of 15% higher than transmission speed V0 so, delivery roll (second transmission unit) 10 provides a paper transmission speed V2 (V2=1.15V1) than transmission speed VI high 15%, delivery roll (the 3rd transmission unit) 11 provides a transmission speed V3 (V3=1.15V2) than transmission speed V2 high 15%, and paper feeding roller (the 4th transmission unit) 12 provides a transmission speed Vs (Vs=1.15V3) than transmission speed V3 high 15%.
In other words, the paper transmission speed that transmission unit provided in a downstream is lower than the speed that transmission unit provided of a upstream side (V0＜V1＜V2＜V3＜Vs), wherein to form the desired paper transmission speed in position is V0 to image.
Shown in Figure 4 and 5, be provided with a clutch coupling 70 optionally to transmit driving force to paper feeding roller 12.First train 62 also comprises a cam disc 71 that is integrally formed between recess gear 62g and the 62h.Cam disc 71 is provided with a joint step 71a. Recess gear 62g and 62h and cam disc 71 are fixed on the axle 72.Recess gear 62g is arranged on the opposite of the neutral gear 62f of driving side, and simultaneously recess gear 62h is with relative with the coaxial slave end gear 62i of paper feeding roller 12.
The engaging lever 73 of a pivot can contact with the peripheral surface of cam disc 71 or with its disengaging.One end of engaging lever 73 links to each other with a bar 74d as the o 74 of actuator.The other end of pivotal engagement bar 73 is provided with an engaging claw 73a.This engaging claw 73a is pressed to cam disc 71 by a spring 75 peripheral surface with engage step 71a and engage.Rotate an end that promotes spring 77 and be rotatably connected on the excentric shaft 76 that is arranged on recess gear 62g (or the recess gear 62h) side, the other end of spring 77 is connected on the framework (not shown) simultaneously.Rotating the function that promotes spring 77 is that promotion recess gear 62g, 62h and cam disc 71 rotate on the counter clockwise direction of Fig. 4 as an individual unit.
The rotary state of these gears 62f, 62g, 62h and 62i is arranged to when the engaging step 71a and engage of the engaging claw 73a of engaging lever 73 and cam 71, stop the rotation of cam 71, neutral gear 62f is positioned on the position of the notch part of crossing recess gear 62g and the tooth of two gears leaves mutually.Similarly, slave end gear 62i also is positioned on the position of the notch part of crossing recess gear 62h and the tooth of these two gears leaves.In this state, the rotating drive power of first driving motor, 63 (see figure 3)s does not just pass on the slave end gear 62i, thereby makes driven side wheel 62i and make paper feeding roller 12 can freely rotate (idle running).
Usually, when a paper feed operation beginning, o 74 is carried out temporary transient (off and on) energising, bar 74a is drawn in o 74 with the expulsive force of antagonistic spring 75 once the signal of receiving a regulation.At this moment, engaging claw 73a is disengaged step 71a.Rotating the expulsive force that promotes spring 77 causes cam disc 71 and recess gear 62g (recess gear 62h) to rotate with the counter clockwise direction in the Figure 4 and 5, make tooth and the neutral gear 62f of recess gear 62g mesh, and transmit its rotating drive power, recess gear 62h and slave end gear 62i engagement simultaneously, and to rotating force of paper feeding roller 12 transmission.Because the energising of o 74 is temporary transient, so engaging claw 73a just keeps sliding contact with the peripheral surface of cam disc 71 by spring 75 expulsive forces when electromagnet 74 cuts off the power supply.After cam disc 71 is finished a revolution, engaging claw 73a just with engage step 71a engagement, the transmission that stops operating.
Do not have in the delivery status of power supply at this, paper feeding roller 12 still can dally.Therefore, because the idle running of paper feeding roller 12, so when the leading edge of paper 3 when transmitting downstream between intermediate conveyor roller 11 and the like in pairs, even when the rear end of paper 3 between paper feeding roller 12 and separating pad 13, paper 3 also is to transmit downstream reposefully.
The a plurality of transmission units of control will be described below to improve the process that on paper 3, forms the speed of image.Fig. 6 is the block scheme of the function of a controller 84 of expression.Controller 84 is the electronic controllers such as microcomputer.Controller 84 comprises: a central processing unit (CPU) 85, and it is used for carrying out the various calculating in the transmission operation of control alignment roller 9, second transmission unit 10, the 3rd transmission unit 11 and paper feeding roller 12; One is used for storage control program and similar information ROM (read-only memory) (ROM) 86; A random-access memory (ram) 87 that is used for temporary transient store various kinds of data; An I/O (I/O) interface (not shown) and similar parts.View data, image form instruction and other data transmit from a main control unit 89 such as principal computer.
The 3rd paper sensor 54, second paper sensor 55, first paper sensor (alignment sensor) 56 and image timer 57 link to each other with CPU 85 by input interface.The detection signal that comes from each sensor all is input to the CPU 85.External unit in output system comprises first driving motor 63, second driving motor 66, is used for the four clutches 70 of paper feeding roller 12, is used for the three-clutch 80 of the 3rd transmission unit 11, the first clutch 82 that is used for the second clutch 81 of second transmission unit 10 and is used for first transmission unit (alignment roller), and they all are connected on the CPU 85 by output interface.
To the control procedure of transmission paper 3 be described below.At first, come the situation that only is provided with a feed unit 4 in printer is described with reference to process flow diagram among Fig. 7 and the time diagram among Fig. 8.
When energized, in S1, carry out various initialization operations.Here, second driving motor 66 is started working, and the sensitization tube 23, transfer roll 25 and the developing roll 27 that drive in machining cell 18 rotate.In addition, the warm-up mill 31 in fixed cell 19 begins to rotate, and connects the well heater of warm-up mill 31.In S2, CPU 85 judges whether to receive a print command from principal computer 89.If received a print command (in S2 for being), so just transmit the dimensional data (as the paper of A4 size) and the view data of the paper 3 that will print thereon.In S3, view data just then converts the form of a print data to and is stored among the RAM 87.
If CPU 85 has changed back (in S4 for being) in the view data of ormal weight and has received a paper feed signal, CPU 85 is with regard to short time energising (startups) o 74 so, and then it become outage (disconnection) state serving as that driving paper feeding roller 12 is to driving force of its transmission in S5.By driving paper feeding roller 12, between paper feeding roller 12 and separating pad 13a, only pull out the plurality of sheets of paper that is stacked on the pressing plate 8 and open 3 go up most one, and other paper that itself and stacker are opened is separated.Paper feeding roller 12 transmits this individual paper 3 with speed Vs, with the leading edge with paper 3 take to the 3rd paper sensor 54 on the paper transport path near.
Since receive the paper feed signal through one first stipulated time Δ T1 (see figure 8) after, CPU85 judges whether paper 3 in S6 leading edge pivot rotates the 3rd paper sensor 54 and sensor 54 is become connection from disconnection.In to estimation, suppose to exist between the leading edge of the tail end limit of paper in front and next paper the interval of a regulation through the first stipulated time Δ T1.Because the 3rd paper sensor 54 detects last paper when next paper is sent a paper feed signal, thus the first stipulated time Δ T1 just be set to one more than or equal to last paper 3 from moment that the paper feed signal sends by the 54 required times of the 3rd sensor and paper cross corresponding to the paper interbody spacer apart from required time within (Fig. 8).When the 3rd sensor 54 kept on-state after the first stipulated time Δ T1 goes over, paper has taken place in CPU 85 supposition box-uped, and ends transmission course.
If the 3rd sensor 54 is set to connect (in S6 for being), CPU 85 just in S7, be provided with immediately three-clutch 80 for connection to begin to drive delivery roll (the 3rd transmission unit) 11.Paper feeding roller 12 transmits the leading edge of paper 3 between drive roll 11a and driven voller 11b after, delivery roll 11 with transmission speed V3 (＜Vs) with paper 3 transmission to delivery roll (second transmission unit) 10.In delivery roll 11 transmission paper 3,12 idle running of paper feeding roller, as mentioned above.Therefore, paper feeding roller 12 just do not limit paper 3 the back half, paper 3 can be transmitted downstream by the driving force of delivery roll 11.
The second stipulated time Δ T2 in the past after, CPU 85 judges whether paper 3 in S8 leading edge pivot rotates second paper sensor 55 and second sensor 55 is become connection from disconnection.Here, the second stipulated time Δ T2 (see figure 8) is based on the same reasons that the first stipulated time Δ T1 is set and stipulates.
That is to say that detect next paper 3 and begin to drive moment of delivery roll 11 at the 3rd paper sensor 54, second paper sensor 55 has just detected last paper 3.Therefore, the second stipulated time T2 is set to one and strides across and the schedule time of paper interbody spacer within the needed time of corresponding distance by the 55 needed times of second paper sensor and at paper 3 after beginning to drive delivery roll 11 more than or equal to last paper 3.When second paper sensor 55 was in on-state after the second stipulated time Δ T2 goes over, CPU 85 concluded that paper takes place box-upes, and interrupts transmission course.
As in the process of above-mentioned S6, if second paper sensor 55 is (in the S8 for being) that connect, CPU 85 is provided with second clutch 81 immediately to connection in S9, begin to drive delivery roll (second transmission unit) 10.Connected after the leading edge of paper 3 becomes the period of a regulation between drive roll 10a and driven voller 10b by the leading edge of paper 3 from second paper sensor 55, just, after one the 3rd stipulated time Δ T3 (see figure 8) is over and done with, CPU 85 is provided with three-clutch 80 to disconnecting in S10, make delivery roll (the 3rd transmission unit) 11 idle running on the upstream extremity of transmission direction.Such structure is arranged, second delivery roll 10 with transmission speed V2 (＜V3) paper 3 is transferred to a downstream end (alignment roller 9 sides).
(see figure 8) after the 4th stipulated time Δ T4 goes over, CPU 85 judges whether that in S11 the leading edge of paper 3 has touched the alignment sensor 56 that is positioned at alignment roller 9 upstreams and connected alignment sensor 56.Here, the 4th stipulated time Δ T4 is set to the time based on the same reasons that the second stipulated time Δ T2 is set.
In S12, connecting short time interval (one the 5th stipulated time T5) constantly beginning from alignment sensor 56 after past, CPU 85 connects first clutches 82, drives alignment roller 9 rotations, and disconnect second clutch 81, second delivery roll 10 can be dallied.Therefore, alignment roller 9 with transmission speed V1 (＜V2) form location transmission paper 3 to image.
The drive roll 9a of alignment roller 9 and driven voller 9b are positioned to their axle vertical orientation in the transmission path of paper alignment operation.That is, when the leading edge of paper 3 and drive roll 9a and driven voller 9b in abutting connection with the time, the first half of paper 3 just by bending slightly so that the leading edge of paper 3 can be orientated vertical with transmission direction.With after transmission direction is vertical, CPU 85 just drives drive roll 9a and rotates, the leading edge of transmission paper 3 between drive roll 9a and driven voller 9b at the leading edge of paper 3.As a result, just each paper all can be adjusted on the correct direction.
When the image that is located immediately at alignment roller 9 downstreams in the leading edge of paper 3 and the transmission direction forms sensor 57 and contact and connects image timer 57 (in S13 for being), CPU 85 just in S14 gated sweep unit 17 begin to launch laser to rotation sensitization tube 23.As a result, on sensitization tube 23, just formed a latent image of the static based on view data.This latent image forms a visual image (toner image) by the toner of supply on developing roll 27, and visual image is brought to image formation position.
One from moment that image timer 57 is connected until paper 3 move between sensitization tube 23 and transfer roll 25 the 6th stipulated time Δ T6 in the past after (see figure 8), CPU 85 breaks first clutch 82 at S15, and the drive roll 9a of alignment roller 9 can be dallied.Therefore, the leading edge of paper 3 just places on the position between sensitization tube 23 and the transfer roll 25, and paper 3 with transmission speed V0 (＜V1) transmit.The visual image (toner image) that arrives the contact point (image formation position) between sensitization tube 23 and the transfer roll 25 just is transferred on the surface of paper 3.
When alignment sensor 56 (in S16 for being) has been passed through on the tail end limit that CPU 85 detects paper 3, then one the 7th stipulated time Δ T7 that passes completely through alignment roller 9 until the tail end limit of paper 3 from detection time among S16 in the past after, alignment roller 9 has just been passed through on the tail end limit of paper 3.Just stop exert pressure drive roll 9a and driven voller 9b together this moment with a regulation.
Based on another control program, CPU 85 judges whether that according to the size of view data operation finishes.When opening on 3 when continuing image information at plurality of sheets of paper, process just begins to repeat from S4.Send second and time of the feeding signal of follow-up paper 3 be that the tail end limit transmission of last paper 3 is through leaving the supplying position needed time of predetermined distance L downstream.
When opening at plurality of sheets of paper when forming image continuously on 3, paper feeding roller 12 just at a feeding feeding zero hour paper 3 with a predetermined distance L between the leading edge of the tail end limit that is implemented in last paper 3 and follow-up paper 3.Paper 3 also transmits with transmission speed Vs.But when the leading edge of paper 3 arrives the downstream of the 3rd delivery roll 11, as previously discussed, the 3rd delivery roll 11 is just with speed V3 (＜Vs) transmission paper 3.Be positioned at paper feeding roller 12 idle running of upstream extremity, thereby make paper 3 can not relax with transmission speed V3 transmission.As mentioned above, by carry out between the 3rd delivery roll 11 and second delivery roll 10, between second delivery roll 10 and the alignment roller 9 and alignment roller 9 and image form deceleration-operation between the position, and the transmission unit (wherein having only individual paper 3 to pass through constantly at any one) from this position upstream is dallied, just shorten along the transmission path that forms the position from paper feeding roller 12 to image at the interval between the tail end limit of the leading edge of last paper 3 and back one paper 3.
In first embodiment, the paper at paper feeding roller 12 places is spaced apart 60 millimeters.Form at image between the leading edge of the tail end limit of last paper of position and back one paper paper at interval L0 roughly be made as 10 millimeters.Suppose that traditional image formation speed is 38/minute, just may transmit 50 millimeters needed times (in the present embodiment by paper is shortened to 10 millimeters from 60 millimeters at interval) shortening paper the time period.Therefore, the present invention can reduce and is equal to 38 * 50 millimeters=1900 millimeters image formation time.Because the length of the paper 3 of A4 size is 297 millimeters, thus image forms speed can increase 1900/297=6.3 and open/minute, and need not to change the peripheral speed of sensitization tube 23.
The 5th stipulated time Δ T5 after the leading edge that detects paper 3 in alignment sensor 56 is past tense, just allows 10 idle running of second delivery roll, and drives alignment roller 9 simultaneously.But when printing continuously plurality of sheets of paper and open 3, a timer can be set calculate from alignment sensor 56 and detect the tail end limit of paper 3 through time until the leading edge that detects back one paper 3.If adjust the time that begins to drive alignment roller 9 based on the time of counting, so just can compensate uneven in the feed unit spare paper 3 leading edge positions, thereby realize the interval of being wanted between all paper 3 with this timer.Interval between all paper 3 also can be adjusted by changing the start time that drives the 3rd delivery roll 11 and second delivery roll 10, rather than changes the start time that drives alignment roller 9.
Then, come an image forming apparatus according to second embodiment is described with reference to a process flow diagram among Fig. 9 and a timetable among Figure 10.The mechanism of second embodiment is provided with and is basically the same as those in the first embodiment, but the transmission course of controlling paper 3 and first embodiment's is different.In a second embodiment, the clutch coupling of paper feeding roller 12 be with first embodiment in clutch coupling 80,81 and 82 similar electromagnetic clutchs (not shown).Therefore, when each electromagnetic clutch was connected, corresponding clutch coupling just was made as power delivery or connection status with transmission of drive force.When the outage of each electromagnetic clutch, corresponding clutch coupling just is made as non-transformer transmission or off-state, and transmission of drive force not, makes the drive roll and the driven voller idle running that are positioned at the clutch coupling corresponding position.
When power connection, in S21, just carry out various initialization operations.Here, second driving motor 66 is started working, and the sensitization tube 23, transfer roll 25 and the developing roll 27 that drive in machining cell 18 rotate.In addition, the warm-up mill 31 in fixed cell 19 begins to rotate, and connects the well heater of warm-up mill 31, and similar operation.In S22, CPU 85 judges whether to receive a print command from principal computer 89.If received a print command (in S22 for being), so just transmit the dimensional data (as the paper of A4 size) and the view data of the paper 3 that will print thereon.In S23, view data just then converts the form of a print data to and is stored among the RAM 87.
If CPU 85 has changed back (in S24 for being) in the view data of ormal weight and has received a paper feed signal, CPU 85 just connects clutch coupling, three-clutch 80 and the second clutch 81 of paper feeding roller 12 in S25 so, drives paper feeding roller 12, the 3rd delivery roll 11 and second delivery roll 10 and rotates.As a result, between paper feeding roller 12 and separating pad 13a, only pull out in feed unit 4 and open 3 a piece of paper of going up most, and other paper that itself and stacker are opened is separated from the plurality of sheets of paper that is stacked on the pressing plate 8.Paper feeding roller 12 transmits this individual paper 3 with speed Vs, with the leading edge with paper 3 take to the 3rd paper sensor 54 on the paper transport path near.
In S26, the leading edge that CPU 85 judges whether paper 3 pivot rotates the 3rd paper sensor 54, and the 3rd sensor 54 is connected.If the 3rd paper sensor 54 is (in the S26 for being) that connect, becoming connection (in S26 for being) since the 3rd paper sensor 54 has so passed through after one the tenth stipulated time Δ T10, CPU 85 just breaks the clutch coupling that is used for paper feeding roller 12 at S27, and paper feeding roller 12 can be dallied.The tenth stipulated time Δ T10 (see figure 10) is to move to needed transmission time between the 3rd delivery roll 11 from moment that the 3rd paper sensor 54 is connected by the leading edge of paper 3 until leading edge.After the leading edge of paper 3 is transferred to the 3rd delivery roll 11 and moves between them, just allow paper feeding roller 12 idle running, make paper 3 can with transmission speed V3 (＜Vs) to 10 transmission of second delivery roll, and can not be subjected to the obstruction of paper feeding roller 12.
In S28, CPU 85 judges whether to detect at second paper sensor, 55 places the leading edge of paper 3, that is whether second sensor 55 has been connected.If second paper sensor 55 is (in the S28 for being) that connect, CPU 85 has just passed through (see figure 10) after one the 11 stipulated time Δ T11 from the moment that second paper sensor 55 becomes connection in S29, disconnect three-clutch 80, the 3rd delivery roll 11 can be dallied.The 11 stipulated time Δ T11 arrives needed transmission time of position between second delivery roll 10 from moment that second paper sensor 55 is connected by the leading edge of paper 3 until leading edge.When the leading edge of paper 3 is transferred to second delivery roll 10 and moves between them, just allow the idle running of the 3rd delivery roll 11, make paper 3 can with transmission speed V2 (＜V3) to alignment roller 9 transmission, and can not be subjected to the obstruction of the 3rd delivery roll 11.
Similarly, in S30, CPU 85 judges whether to detect at alignment roller sensor 56 places the leading edge of paper 3, that is whether alignment roller sensor 56 has been connected.In S31, CPU 85 disconnects second clutch 81 after having passed through one the 12 stipulated time Δ T12 from the moment that alignment roller sensor 56 becomes connection (among S30 for be), and second delivery roll 10 can be dallied.The 12 stipulated time Δ T12 be from the moment that alignment sensor 56 is connected by the leading edge of paper 3 reach until leading edge between the alignment roller 9 that stops the position and with this needed transmission time of aliging or aiming at leading edge.By this way, paper 3 just can carry out an alignment procedure so that leading edge is concordant with alignment roller 9 as described above.
In the 12 stipulated time Δ T12 past back (see figure 10), CPU 85 drives alignment roller 9 in S32.Therefore, the leading edge of paper 3 transmits between alignment roller 9, second delivery roll, 10 idle running simultaneously, make paper 3 with transmission speed V1 (＜V2) form location transmission to image, and the latter half of paper 3 can not be subjected to the obstruction of second delivery roll 10.
When the leading edge of paper 3 touches the image timer 57 that is arranged in alignment roller 9 direct downstreams in the transmission direction and connect image timer 57 (at S33 for being), CPU 85 just in S34 17 beginnings of gated sweep unit to rotating sensitization tube 23 emission laser (S34).As a result, on sensitization tube 23, just formed a latent image of the static based on view data.This latent image forms a visual image (toner image) by the toner of supply on developing roll 27, and visual image is brought to image formation position.
(leading edge of paper 3 moves to the needed time between sensitization tube 23 and transfer roll 25 to connect the 14 stipulated time Δ T14 that constantly begins at one from image timer 57, see Figure 10) after the past, CPU 85 breaks first clutch 82 at S35, and drive roll 9a can be dallied.Therefore, the leading edge of paper 3 just places on the position between sensitization tube 23 and the transfer roll 25, and paper 3 with transmission speed V0 (＜V1) transmit.The visual image (toner image) that arrives the contact point (image formation position) between sensitization tube 23 and the transfer roll 25 just is transferred on the surface of paper 3.
When alignment sensor 56 (in S36 for being) has been passed through on the tail end limit that CPU 85 detects paper 3, then one the 15 stipulated time Δ T15 (see figure 10) of passing alignment roller 9 until the tail end limit of paper 3 from detection time among S36 in the past after, alignment roller 9 has just been passed through on the tail end limit of paper 3.Just stop exert pressure drive roll 9a and driven voller 9b together this moment with a regulation.
In another control program, CPU 85 judges whether that according to the size of view data printing finishes.When opening on 3 when continuing image information at plurality of sheets of paper, process just begins to repeat from S24.
When second and follow-up paper 3 on when printing, the 3rd delivery roll 11 just is driven in the past once more disconnecting constantly one the 16 stipulated time Δ T16 that has passed through the 3rd delivery roll 11 until the tail end limit of paper 3 from the 3rd sensor 54.Second delivery roll 10 is driven in the past once more at one the 17 stipulated time Δ T17 that has passed through second delivery roll 10 until the tail end limit of paper 3 from the 55 disconnection moment of second sensor.
In control procedure, when importing the feeding signal of first paper 3 of feeding, begin rotation and can begin to drive simultaneously the 3rd delivery roll 11 and second delivery roll 10 at paper feeding roller 12.In addition, be not such as in the above-described embodiments when leading edge that detects institute's transmission paper 3 with paper sensor 54-56 and image timer 57 or tail end limit by counting the on/off operation that Δ T1 comes solenoidoperated cluthes 70-82 to Δ T17 computing time based on detection signal, can be according to the dimensional data that is located at the paper in the feed unit with from calculate the time that the time that drives each transmission unit and permission unit dally as the data of the path-length of paper feeding roller 12 to the 3rd delivery rolls 11, second delivery roll 10 and the alignment roller 9 of the 4th transmission unit.
In described embodiment, laser printer 1 be provided with two feed units 4,4 '.If paper 3 is from down feed unit 4 ' feeding, paper 3 is just from one the 5th delivery roll 11 in following feed rolls a 12 ' downstream ' be transferred to the 3rd delivery roll 11 so.Therefore, be provided be used for the 5th delivery roll 11 ' one the 5th clutch coupling 83, shown in the block scheme of Fig. 6.The 5th delivery roll 11 ' being actuated to a transmission speed greater than the 3rd delivery roll 11 transmits paper 3, simultaneously to the control operation of the 5th clutch coupling 83 and similar to the described control operation of other clutch coupling in above embodiment.In addition, even the leading edge of the paper in feed unit 4 or 4 is not alignment mutually, also can between adjacent paper, provide desired interval by the tail end limit of detecting last paper and the leading edge that detects next paper.
In the above-described embodiment, be provided with a plurality of (not limiting to a number or amount) transmission unit with speed transmission paper 3 on the direction in downstream along transmission path to reduce.When the leading edge of recording medium moves between the transmission unit in a downstream, just for making the upstream transmission unit, its off-state is in a not state of driving by the clutch coupling of controlling this tight adjacent upstream transmission unit.Therefore, when opening (recording medium) last formation continuously image at plurality of sheets of paper, even the paper feed time cause feed unit 4,4 ' near paper broad at interval, also can shorten the tail end limit of the last paper before image forms the position just and the back interval between the leading edge of a paper.Therefore, just make the time waste that causes at interval owing to the paper of broad minimum, and the quantity of the paper of having printed image in image forming course in the time per unit is increased, and need not the peripheral speed of sensitization tube is increased to bigger than traditional speed.
In addition, friction factor is different in various types of paper 3, and can skid and similar problem between paper 3 and the roller at all transmission units.As a result, the peripheral speed of transmission unit is just inconsistent with the transmission speed of paper 3.The transmission speed of general paper 3 is slower than the peripheral speed of roller.When the time of the idle running that switches on and off clutch coupling, beginning transmission unit was set based on designed transmission unit peripheral speed, paper just may not line up.On the contrary, by the upstream that is right after at each transmission unit a sheet detecting apparatus is set in an embodiment of the present invention, can solenoidoperated cluthes being used for being arranged on sensing result's basis contiguous this sensor and transmission unit at its upstream is non-driven state, thereby realizes the accurate timing of control transmission unit.
In all transmission units each all is configured with a drive roll and a driven voller that rotates with drive roll.By being each drive roll setting clutch coupling separately, just can carry out the operation that drive roll can be dallied by a foolproof structure.
In addition, because clutch coupling is an electromagnetic clutch or other slip clutch, switches so can proceed to the on/off of the power supply of transmission unit promptly, thereby further improved print speed.
Moreover, all transmission units are to be arranged in a separating layer to be stacked in the paper feed position of one of all recording medium in the feed unit and primary feed and one and to form between the position at the image that forms image on the paper.Also have, all transmission units are configured to form from the paper feed position to image on the direction in downstream of position and transmit paper with the speed that reduces.Therefore, just can simply be constructed by simply the conventional transmission unit of arranging along transmission path being added clutch coupling.
In addition, because the transmission speed of each transmission unit is set to prevent that the tail end limit of last paper is overlapping with the leading edge of back one paper,, described embodiment box-upes so can preventing along the paper of transmission path.
Recently to the requirement of high speed image information, that is increase time per unit imaging paper number require increasing.In order to meet this requirement, if the peripheral speed of sensitization tube increases, time waste just becomes a typical problem that obtains aspect, predetermined paper interval so.In described embodiment, just need between adjacent paper, not improve bigger interval, also need not increase the peripheral speed of Electrifier frame, photoreceptor for high speed image information.
Be described to 14 pairs of image forming apparatus with reference to Figure 11 (a) below according to third embodiment of the invention, among these figure, with the same section shown in Fig. 1 to 10 and member with identical label and letter representation.The 3rd embodiment relates in a feed unit 4 adjustment to paper leading edge position.
Identical with the embodiment of front, the width of paper feeding roller 12 and separating pad 13 width than paper 3 on perpendicular to the direction of paper 3 transmission directions is little, and paper feeding roller 12 only contacts with the substantial transverse center of paper 3 with separating pad 13.
Shown in Figure 11 (a) and 11 (b), a pair of leading edge adjustment unit 180 is arranged in the horizontal left side and the horizontal right side of a separating pad 113a and paper feeding roller 12, so that the free end of adjustment unit 180,180 can projection enter paper transport path near formed paper separation point position between paper feeding roller 12 and the separative element 113.As expression best in Figure 11 (a), each leading edge adjustment unit 180 comprises that one is positioned at a motionless locational pivot 181, adjusting lever 182, biasing spring 183, a stopping part 184 and an actuator 185.Adjusting lever 182 is bearing on the pivot 181 pivotally, and movable in the paper transmission direction.Biasing spring 183 is used for the individual free end of each adjusting lever 182 is pressed to a upstream side in the paper transmission direction.Stopping part 184 is arranged on the fixing position, and is used for when the free end of adjusting lever 182 stretches into paper transport path and adjusting lever 182 adjacency.Actuator 185 is os, and it promotes the free end of adjusting lever on adjusting lever 182 links to each other with the direction of leaving paper transport path at one, shown in the double dot dash line among Figure 11 (a).
Adjusting lever 182 extend into extended position in the transmission path be and between paper delivery roll 12 and separating pad 113a formed end, upstream of clamping the zone corresponding to, so just can limit paper leading edge mobile to the downstream of the end, upstream of clamping the zone.
Below the leading edge position adjustment of carrying out with leading edge adjustment unit 180 will be described.Figure 12 shows the control structure that is used for this purpose.Electronic controller such as microcomputer is as a controller 186.Controller 186 comprises a central processing unit (CPU) 187 that is used for carrying out the various operations of paper leading edge position adjustment.Controller 186 comprises that also 189, one of a ROM (read-only memory) (ROM) that are used for storage control program and similar information is used for the random-access memory (ram) 188 of temporary transient store various kinds of data, I/O (I/O) interface (not shown) and similar parts.View data, image form instruction and other data transmit from a main control unit 190 such as principal computer.
Output peripheral equipment comprises first driving motor 63, second driving motor 66 and an o 74, solenoid 185,185 in pairs, and they are connected on the CPU 187 by output interface (not shown).Identical with aforesaid embodiment, first motor 63 is used to drive the intermediate conveyor roller 11,10 in paper feeding roller 12 and paper delivery roll 12 downstreams.Second driving motor 66 is used to drive other mechanism and the machining cell 18 in alignment roller 9 downstreams.O 74 is used at driving condition and does not switch paper feeding roller 12 between the driving condition.
Then be described with reference to the process of the process flow diagram among Figure 13 to the position adjustment of control paper leading edge.When energized, in S51, just carry out initialization operation.Just, first driving motor 63, second driving motor 66 and similarly parts start working, rotate sensitization tube 23 in machining cell 18 and transfer roll 25, developing roll 27, warm-up mill 31, intermediate conveyor roller 10 and 11 and similar component.In addition, the heating arrangement in warm-up mill 31 has also been connected.In these initial operations, o 74 is made as off-position (disconnection), so that the power of first driving motor 63 is not sent to paper feeding roller 12.Also have, in initial operation S51, cause o 185 to disconnect so that the free end of adjusting lever 182 can stretch in the paper transport path under the effect of the pressure of spring 183.Then, print command passes after CPU 187 from control device 190 in S52, just to the dimensional data (as representing the paper data of A4 paper size) of CPU 187 transmitted image data and the paper 3 that will print thereon.The result is in S53, and view data just then converts a print format to and is stored among the RAM 188.
In S54, o 74 switches to "on" position (connection) and switches to off-position (disconnection) then to transmit a driving force to paper feeding roller 12.As a result, paper feeding roller 12 accurately rotates a circle off and on, and only pull out between paper feeding roller 12 and separating pad 113a that the stacker that is stacked on the pressing plate 8 opens go up one most, and other paper that itself and stacker are opened is separated.Then, the leading edge of paper 3 just is brought to the free end of outstanding adjuster bar 182 adjacent.After adjacency, in pairs o 185 is switched on (S55) immediately, regains the free end of adjusting lever 182,182 with the bias force of resisting this spring 183 from paper transport path with leaving, takes this paper 3 is moved to paper delivery roll 11.When the leading edge of paper 3 is clipped in just between the intermediate conveyor roller 11 in paper feeding roller 12 downstreams, just idle running of paper feeding roller 12.Therefore, paper 3 can transmission downstream under the effect of the driving force of intermediate conveyor roller 11.
After step S55, whether a predetermined amount of time Δ T is judged (S56) in the past, and after the tail end limit of paper 3 moves past paper feeding roller 12 and separating pad 113a immediately to o 185,185 outage (S57).Therefore, the free end of adjusting lever 182,182 stretches into paper transport path again.Therefore, though back one paper since in the last paper of operation the friction absorbability that produced be pushed to downstream direction, the leading edge of a back paper also can with adjusting lever 182,182 adjacency.Therefore, can prevent that leading edge from leaving regional big the moving downstream of clamping between paper feeding roller 12 and the separating pad 113a.In other words, just can eliminate undesirable reducing at interval between the leading edge of the tail end limit of last paper and back one paper, but can keep a suitable interval.As a result, just can be set the paper feed start time, thereby improve the speed (quantity of per minute print paper) of print processing with a suitable time interval.In other words, the time interval (this can cause lower print processing speed) that just need not to prolong the paper feeding time makes great efforts to the view data conversion and avoids mistake to be judged as paper and box-up the enough time is provided.
Then, based on the size of view data to whether print procedure stops judging (S58).If remaining view data is still arranged, and (S58: not), program will forward S54 to and repeat control and stop until print procedure.When print procedure termination (S58: be), program just finishes.The driving (connection) of o 74 relevant and 185 energising (connection) and outage (disconnections) time and paper feeding roller 12 and driving (disconnection) time is shown in the time diagram of Figure 14 with step S54 to S58.
In the 3rd embodiment, owing to can provide suitable paper interval by adjusting the leading edge position, so can form suitable image at the appropriate area place of paper 3.In addition, because the time that can correctly provide paper feeding to begin, so also accelerated the speed of print processing.
Revise modification for one as the 3rd embodiment, when adjusting lever 182 free ends when their retrieving position is shifted to their extended position, as long as adjusting lever 182 can not hamper the moving of leading edge of last paper, can also shown in dot-and-dash line among Figure 14, shorten the duration of the on-state of o 185 with the order of an a-b-c-d.
In the 3rd embodiment, paper leading edge position adjustment unit 180 is operated to allow paper to move in time relatively with separating pad 113a and paper disengaging time.Therefore, in case need to separate, can be ideally from the stacker of remainder is opened feeding paper the preceding.
Moreover, owing to adopted electromagnetic clutch, so paper leading edge position adjustment unit 180 can move between adjustment position and non-adjustment position apace, paper subsequently just can be subjected to the adjustment of leading edge position reliably.
In addition because be that the upstream extremity place of clamping the zone between paper feed roller 12 and separating pad 113a adjusts, so adjustment unit 180 can zero defect ground the leading edge of the follow-up paper of adjustment.
Moreover, paper leading edge position adjustment unit the 180, the 180th is symmetrical in that paper feeding roller 12 arranges, that is adjustment unit the 180, the 180th, on paper feeding roller 12 next doors paper 3 transversely, promptly perpendicular to the symmetric arrangement in a lateral direction of paper transmission direction.Such layout is arranged, and the leading edge of paper just can be adjusted on a direction perpendicular to the paper transmission direction.This means that paper can be positioned on the direction, so that the leading edge of paper is oriented orthogonal to transmission direction when adjustment unit leaves leading edge.Therefore, just can prevent feeding paper obliquely.
Therefore, the above embodiments can provide a kind of image processing system, and it can reduce and follows paper to stipulate at interval and the time waste that produces, and increases the formation image number of paper of time per unit.In addition, the foregoing description can provide one can form the device for image forming that image also keeps high processing rate simultaneously in the appropriate position on recording medium.Although the present invention is described in detail with reference to its specific embodiments, concerning those those skilled in the art that, it is evident that, wherein can carry out various modifications and variations and do not exceed the principle and scope of the present invention.For example, paper feeding roller 12 in the above-described embodiments can form from a side and see shape as alphabetical D, has paper transmission curved surfaces and a straight line surfaces of not transmitting.In addition, the above embodiments have adopted the feed unit of a friction separate type, and the friction separating pad made of the material that a usefulness is had big friction factor is arranged in the opposite of paper feeding roller 12 circumferential surfaces therein.But the present invention also can be applied in the feed unit that has ramp type (bank-type) separating mechanism.In a kind of feed unit in back, paper feed roller is placed to stacker is opened and goes up one most and contact, and a ramp member is placed to and is approximately perpendicular to paper transport path to stop paper.When driving the rotation of paper feeding roller, go up a piece of paper most and can cross ramp member by utilizing the linear directional character of paper after bending.
Also have, the above embodiments relate to a laser printer 1.But when use a color laser printer, ink-jet printer, thermal printer, when dot matrix collides printer and similar printer, the present invention also can reduce the time waste that causes owing to the large-spacing between the paper of consecutive transmissions and can be increased in the per minute speed of paper in the image forming course, and can negative effect not arranged to print quality.Moreover, use sensitization tube 23 in the above-described embodiment as Electrifier frame, photoreceptor, but also can the usability light belt.Although transfer process has been used a transfer roll 25, also can use corona discharge systems.In addition, the transmission speed of multi-functional feed rolls 15a, delivery roll 16 and alignment roller is successively decreased to the downstream direction of transmission path.
Claims (11)
1. printing equipment that is used on the image recording media of well cutting forming image, it comprises:
A drive source;
A folded image recording media (3) has wherein been stored in a paper feed unit (4);
An image formation unit (5), a visual image is formed on the image recording media at described image formation unit place;
, a transmission path that between paper feed unit and image formation unit, extends (7), each image recording media passes transmission path and is transferred to image formation unit with transmission direction from the paper feed unit; And
At least two paper transmission unit that link to each other with drive source (9,10,11), comprise the transmission unit (9) in a downstream and the transmission unit (10 of a upstream side, 11), the transmission unit in downstream (9) arranges that along transmission path (7) are used for one first transmission speed images recording medium, and the transmission unit (10 of upstream side, 11) arrange along transmission path (7), and the upstream that is positioned at the downstream transmission unit in transmission direction is used for also comprising with the second transmission speed images recording medium greater than first transmission speed:
Comprise a first clutch (82) and a second clutch (81,80) at least two clutch couplinges, first clutch (82) is connected between drive source and the downstream paper transmission unit (9), provide a "on" position that drives the downstream transmission unit and one to cut off the off-position that the electric power of side transmission unit downstream transmits, and second clutch (81,80) be connected drive source and upstream side paper transmission unit (10,11) between, provide a "on" position that drives the upstream side transmission unit and one to cut off the off-position that the electric power of side transmission unit upstream transmits; And
A controller (186) is controlled described at least two clutch couplinges so that provide off-position in upstream side transmission unit (10,11) when downstream paper transmission unit (9) is clamped a leading edge part of image recording media.
2. printing equipment as claimed in claim 1 is characterized in that, paper feed unit (4) comprise that provides the paper feeding roller (12) greater than the 3rd transmission speed of the second paper transmission speed.
3. printing equipment as claimed in claim 1, it is characterized in that, controller (186) comprises and is used for stopping the clamping device of the driving operation of downstream paper transmission unit (9) at least, so that the leading edge of image recording media abuts in the downstream paper transmission unit (9) that has stopped, with the interval between the leading edge of the tail end limit of image recording media before being adjusted at and subsequent image recording medium.
4. printing equipment as claimed in claim 3 is characterized in that, downstream paper transmission unit (9) comprises an alignment roller perpendicular to the extension of paper feed direction.
5. printing equipment as claimed in claim 1, it is characterized in that, comprise that also one is connected to controller (186) and is arranged in paper sensor (56 between downstream paper transmission unit and the upstream side paper transmission unit along paper transport path (7), 55), it is used for producing one at image recording media during by paper sensor and detects the paper signal, and
Wherein, controller (186) comprises the device that is used for when the sensor generation detects the paper signal second clutch being switched to off-position.
6. printing equipment as claimed in claim 5, it is characterized in that controller (186) comprises and is used for that first clutch (82) switched to its off-position and switches to its "on" position then to detect the device that stops period of controlling a subsequent image recording medium at the tail end limit of preceding image recording media and the leading edge that detects the subsequent image recording medium based on paper sensor.
7. printing equipment as claimed in claim 1, it is characterized in that downstream paper transmission unit (9) comprises first driven voller (9b) that first drive roll (9a) that links to each other with first clutch (82) and can rotate with the rotation of first drive roll (9a); And
Wherein upstream side paper transmission unit (10,11) comprise second drive roll that links to each other with second clutch (81,80) (10a, 11a) and one can with second drive roll (10a, second driven voller that rotation 11a) is rotated together (10b, 11b).
8. printing equipment as claimed in claim 1 is characterized in that, each in first clutch and the second clutch all comprises a power clutch.
9. printing equipment as claimed in claim 1, it is characterized in that, paper feed unit (4) comprises that is used for piling up therein the paper bin (6) that many images form medium, it provide epigraph form medium from remaining folded the paper feeding position of separation, and wherein image formation unit (5) provides an image to form the position, and described at least two paper transmission unit are arranged in the paper feeding position and image forms between the position.
10. one kind is used for forming the printing equipment that forms image on the medium at the image of well cutting, and it comprises:
The drive source that driving force is provided;
A paper feed unit (4), comprise that many image recording medias (3) are stacked into the paper storage area (6) and a paper feeding roller (12) of a quires therein, described paper feeding roller (12) is used for isolating an image recording media and along the isolated image recording media of paper feed direction feeding from remaining quires;
An image formation unit (5), a visual image is formed on the image recording media (3) at described image formation unit place, and described image formation unit (5) comprises that one is loaded with one and is used for the developer image is transferred to transfer roll (25) on the image recording media as the dive Electrifier frame, photoreceptor (23) of image and one of the static that wherein is loaded with developer of developer image;
, a transmission path (7) that between paper feed unit (4) and image formation unit (5), extends, each image recording media (3) passes transmission path (7) and is transferred to image formation unit (5) with direction of feed from paper feed unit (4);
Arrange and be positioned at the first paper delivery roll (9) between paper feeding roller (12) and the transfer roll (25) that its peripheral speed is less than the peripheral speed of paper feeding roller (12) and greater than the peripheral speed of transfer roll (25) for one along transmission path (7);
One is connected to the first paper delivery roll (9) upward selectively to transmit the first clutch (82) of the driving force of power supply to the first paper delivery roll, and it provides the "on" position and the off-position that stops the first paper delivery roll (9) that drive the first paper delivery roll;
One is connected to paper feeding roller (12) and goes up selectively to transmit the second clutch (70) of the driving force of power supply to the paper feeding roller; And
A controller (186), it comprises:
Breaker device, it moves through the first paper delivery roll (9) off-position is provided afterwards in the tail end limit at preceding image recording media, so that the leading edge of subsequent image recording medium and first paper delivery roll (9) adjacency that stops, with the interval between the leading edge of the tail end limit of paper before being adjusted at and follow-up paper; With
Drive starting apparatus, after adjusting at interval, make first clutch (82) be in "on" position to begin to drive the rotation of the first paper delivery roll (9).
11. printing equipment as claimed in claim 10 is characterized in that, the off-position that second clutch (70) provides a "on" position that drives paper feeding roller (12) and cut-out to transmit to the electric power of paper feeding roller (12) from power supply; And
Image forming apparatus also comprises:
One is provided with and is arranged on second delivery roll (10 between the paper feeding roller (12) and the first paper delivery roll (9) along paper transport path (7), 11), the peripheral speed of described second delivery roll (10,11) is less than the peripheral speed of paper feeding roller (12) and greater than the peripheral speed of the first paper delivery roll (9);
One is connected to the second paper delivery roll (10,11) selectively to transmit the three-clutch (81 of the driving force of power supply to the second paper delivery roll, 80), it provides one to drive the second paper delivery roll (10,11) "on" position and one stop the off-position to transmit to the electric power of the second paper delivery roll (10,11) from power supply; And
Wherein, controller (186) also comprises:
Second breaker device, it is provided the off-position of a second clutch (70) when clamping by the second paper delivery roll (10,11) at the leading edge of an image recording media;
The 3rd breaker device, it is provided the off-position of a three-clutch (81,80) at the leading edge of image recording media when clamping by the first paper delivery roll (9); And
The 4th breaker device, it provides the off-position of a first clutch (82) when the leading edge of image recording media is clamped between Electrifier frame, photoreceptor and transfer roll.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001387834A JP3753063B2 (en) | 2001-12-20 | 2001-12-20 | Image forming apparatus |
| JP2001387834 | 2001-12-20 | ||
| JP2001-387834 | 2001-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1427315A CN1427315A (en) | 2003-07-02 |
| CN100370366C true CN100370366C (en) | 2008-02-20 |
Family
ID=19188095
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021574758A Expired - Fee Related CN100370366C (en) | 2001-12-20 | 2002-12-20 | Image forming apparatus capable of regulating paper transmission time |
| CN 02292575 Expired - Lifetime CN2663144Y (en) | 2001-12-20 | 2002-12-20 | Image forming device for regulating paper transmission time |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02292575 Expired - Lifetime CN2663144Y (en) | 2001-12-20 | 2002-12-20 | Image forming device for regulating paper transmission time |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3753063B2 (en) |
| CN (2) | CN100370366C (en) |
| HK (1) | HK1056230A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3753063B2 (en) * | 2001-12-20 | 2006-03-08 | ブラザー工業株式会社 | Image forming apparatus |
| JP4235528B2 (en) * | 2003-10-16 | 2009-03-11 | キヤノン株式会社 | Sheet supply apparatus and image forming system |
| JP4371960B2 (en) * | 2004-09-06 | 2009-11-25 | キヤノン株式会社 | Image forming apparatus |
| JP2006201720A (en) * | 2005-01-24 | 2006-08-03 | Kyocera Mita Corp | Paper sheet conveyance control unit of image forming apparatus |
| JP4623663B2 (en) * | 2006-07-10 | 2011-02-02 | 株式会社リコー | Sheet material conveying apparatus and image forming apparatus |
| JP4829717B2 (en) * | 2006-08-23 | 2011-12-07 | キヤノン株式会社 | Recording apparatus and conveyance control method |
| JP4886426B2 (en) * | 2006-08-23 | 2012-02-29 | キヤノン株式会社 | Recording apparatus and conveyance control method |
| JP5659662B2 (en) * | 2010-09-27 | 2015-01-28 | ブラザー工業株式会社 | Image recording device |
| JP6693156B2 (en) | 2016-02-08 | 2020-05-13 | 富士ゼロックス株式会社 | Image forming device |
| CN113335969B (en) * | 2021-05-31 | 2023-03-17 | 重庆恒亚实业有限公司 | Coiling mechanism of aluminium book |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04275564A (en) * | 1991-03-04 | 1992-10-01 | Ricoh Co Ltd | Image forming device and its form carrying method |
| JPH1035941A (en) * | 1996-07-18 | 1998-02-10 | Mita Ind Co Ltd | Transfer paper carrying mechanism of image forming device |
| US5878321A (en) * | 1996-11-16 | 1999-03-02 | Mita Industrial Co., Ltd. | Image-forming machine |
| US6311039B1 (en) * | 1998-10-26 | 2001-10-30 | Canon Kabushiki Kaisha | Sheet conveying apparatus and image forming apparatus provided with the same |
| CN2663144Y (en) * | 2001-12-20 | 2004-12-15 | 兄弟工业株式会社 | Image forming device for regulating paper transmission time |
-
2001
- 2001-12-20 JP JP2001387834A patent/JP3753063B2/en not_active Expired - Fee Related
-
2002
- 2002-12-20 CN CNB021574758A patent/CN100370366C/en not_active Expired - Fee Related
- 2002-12-20 CN CN 02292575 patent/CN2663144Y/en not_active Expired - Lifetime
-
2003
- 2003-11-19 HK HK03108412A patent/HK1056230A1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04275564A (en) * | 1991-03-04 | 1992-10-01 | Ricoh Co Ltd | Image forming device and its form carrying method |
| JPH1035941A (en) * | 1996-07-18 | 1998-02-10 | Mita Ind Co Ltd | Transfer paper carrying mechanism of image forming device |
| US5878321A (en) * | 1996-11-16 | 1999-03-02 | Mita Industrial Co., Ltd. | Image-forming machine |
| US6311039B1 (en) * | 1998-10-26 | 2001-10-30 | Canon Kabushiki Kaisha | Sheet conveying apparatus and image forming apparatus provided with the same |
| CN2663144Y (en) * | 2001-12-20 | 2004-12-15 | 兄弟工业株式会社 | Image forming device for regulating paper transmission time |
Also Published As
| Publication number | Publication date |
|---|---|
| CN2663144Y (en) | 2004-12-15 |
| JP2003182880A (en) | 2003-07-03 |
| CN1427315A (en) | 2003-07-02 |
| JP3753063B2 (en) | 2006-03-08 |
| HK1056230A1 (en) | 2004-02-06 |
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