CN101303541A - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
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- CN101303541A CN101303541A CNA2008100825333A CN200810082533A CN101303541A CN 101303541 A CN101303541 A CN 101303541A CN A2008100825333 A CNA2008100825333 A CN A2008100825333A CN 200810082533 A CN200810082533 A CN 200810082533A CN 101303541 A CN101303541 A CN 101303541A
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Abstract
The invention provides an imaging device. A common driving source (21) transmits a drive force to a driving unit that drives a feeding unit (14) and a conveying unit (15). The driving source (21) is a motor that rotates in either of a normal direction and a reverse direction. The feeding unit (14) includes a mechanical drive-blocking mechanism in its driving sequence. The conveying unit (15) includes a two-system driving sequence and a mechanical drive-blocking mechanism in the driving sequence so as to rotate in one direction regardless of a rotating direction of the driving source (21). A reduction ratio of each driving sequence in the conveying unit (15) is identical.
Description
The cross reference of related application
The application's book is to the statement preference of the Japanese priority text 2007-173185 that submits in Japan in the Japanese priority text 2007-052086 that submitted in Japan on March 1st, 2007 and on June 29th, 2007, and with its full content as with reference to merging.
Technical background
1, technical field
The present invention relates to a kind of imaging device, such as duplicating machine, printer, facsimile recorder or plotting apparatus, each in them all has paper carrier.
2, description of Related Art
Be installed in paper carrier in traditional imaging device and generally comprise feed-in from the paper feed roller of the paper of sheet feed tray be positioned at the downstream of paper feed roller and paper is sent to transfer roller on the opposing roller.As driver element, a plurality of motors of motor driven such as paper feed roller, transfer roller.
At this moment, in conventional art, widely recommend a kind of method, wherein make each roller carry out different motions keeping the paper feeding ability by opening and closing electromagnetic clutch, such as to the control between the paper, prevent paper feeding or paperboard when the hanging togother.For example, in Japanese Patent Application Publication text 2003-176045 number (hereinafter referred to as " patent documentation 1 ") and Jap.P. the 3782721st (to call " patent documentation 2 " in the following text) this conventional art is disclosed.
In patent documentation 1, paper feed roller and transfer roller receive from the driving force of identical motor in order to controlling the selection of time that its each electromagnetic clutch opens and closes, thereby obtain the paper feeding ability.
Yet the decline of permanance causes many defectives, wherein exists in electromagnetic clutch and slides, thereby paperboard takes place.When removal was periodically replaced parts, the parts that have the highest replacement frequency on the market were electromagnetic clutchs.Therefore, rely on the paper feeding of the opening and closing of electromagnetic clutch to construct to such an extent that lack reliability.
For addressing this problem, patent documentation 2 proposes to adopt the paper carrier of feed-in reverse rollers (FRR) (friction separates) method, and wherein forward and reverse rotation and the one-way clutch with motor combines, thereby do not rely on the paper feeding of electromagnetic clutch.
Specifically, having paper feed roller, transfer roller and the paper carrier at the motor of each paper feed section driven roller constructs with following mode: when motor just changes, paper feed roller and transfer roller drive along the paper feed direction, and when motor reversed, transfer roller was along the transmission of paper feed direction.At this moment, reverse rollers and transfer roller driven in synchronism.
Yet, in patent documentation 2 disclosed technology, the reduction gear ratio of the drive sequences the when reduction gear ratio of the drive sequences when transfer roller is just changeing is different from the transfer roller counter-rotating.Therefore, even under identical transfer rate, compare when just changeing during with counter-rotating and use different pulses to come CD-ROM drive motor, thereby cause the complicacy of control table.When using different pulses to come CD-ROM drive motor, there is small velocity contrast when just changeing and between during counter-rotating, so cause making the structure of paper feeding ability variation.
Summary of the invention
The objective of the invention is to solve problem in the conventional art to small part.
According to an aspect of the present invention, provide a kind of imaging device, it comprises: the image-generating unit that forms toner image on photo-sensitive cell; Be transferred to transfer printing unit on the recording medium with being formed at toner image on the photo-sensitive cell; Photographic fixing is transferred to the toner image fixation unit on the recording medium; The feed-in unit of feed-in recording medium one by one; Be located at the downstream of feed-in unit and recording medium be sent to the delivery unit of transfer printing unit; Be located at the downstream of delivery unit and change the alignment unit that recording medium is fed into the time of transfer printing unit; Drive the driver element of feed-in unit, delivery unit and alignment unit; With the common drive source that driving force is passed to the driver element that drives feed-in unit and delivery unit.Drive source is the motor that rotates along forward or backwards.The feed-in unit is included in the driving blocking-up mechanism of the machinery in its drive sequences.Thereby delivery unit comprise two system drive sequences and the machinery in drive sequences driving blocking-up mechanism no matter the sense of rotation of drive source how and along a direction rotation.The reduction gear ratio of each drive sequences in the delivery unit is identical.
Understand specifying of following preferred implementation of the present invention in conjunction with the drawings, can understand above-mentioned and other purpose, feature, advantage and technical and industrial meaning thereof of the present invention better.
Description of drawings
Figure 1 shows that the structural representation of laser printer of an embodiment of image-forming apparatus according to the present invention;
Figure 2 shows that the structural representation of the paper carrier of the laser printer that is used for Fig. 1;
Figure 3 shows that the front-view schematic diagram of the paper feed driver element of driving paper carrier as shown in Figure 2;
Figure 4 shows that the floor map of the paper feed driver element of driving paper carrier as shown in Figure 2;
Figure 5 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor just changes;
Figure 6 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor reverses;
Figure 7 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor just changes;
Figure 8 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor reverses;
Figure 9 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor just changes;
Figure 10 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor reverses;
Figure 11 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor just changes;
Figure 12 shows that the synoptic diagram of paper feed driver element, it drives paper carrier as shown in Figure 2 when motor reverses;
Figure 13 is a synoptic diagram, utilizes paper to arrive the embodiment of the transfer path of the laser printer among opposing roller state description Fig. 1 before;
Figure 14 is a synoptic diagram, utilizes paper to arrive the embodiment of the transfer path of the laser printer among opposing roller state description Fig. 1 afterwards;
Figure 15 shows that the synoptic diagram of imaging device according to a second embodiment of the present invention;
Figure 16 shows that the synoptic diagram when on the imaging device of second embodiment in Figure 15 the expansion dish being housed;
Figure 17 shows that in second embodiment in Figure 15, drive the floor map of the paper feed driver element of paper carrier when motor is just changeing;
Figure 18 shows that in second embodiment in Figure 15, drive the floor map of the paper feed driver element of paper carrier during the motor counter-rotating;
Figure 19 is a synoptic diagram, and it schematically illustrates in second embodiment in Figure 15 when motor is driven the sense of rotation of each roller on the paper feed driver element in the transfer path;
Figure 20 shows that when motor just changes, drive the floor map of the paper feed driver element of paper carrier, this paper carrier is equipped with the relaying delivery unit of the driving blocking-up mechanism with the machinery in the drive sequences; And
Shown in Figure 21 is the floor map of paper feed driver element, and this paper feed driver element drives the paper carrier with the relaying delivery unit among Figure 20 when motor reverses;
Embodiment
Below in conjunction with accompanying drawing the present invention is specifically described.Figure 1 shows that the structural representation of laser printer of an embodiment of image-forming apparatus according to the present invention.Figure 2 shows that the structural representation of the paper carrier of the laser printer that is used for Fig. 1.
In conjunction with Fig. 1 and 2, to will being described, the present invention is applied to an embodiment of color laser printer (hereinafter referred to as " laser printer "), and this color laser printer adopts the imaging device of the direct printing transferring method of xerography.
In Fig. 1, laser printer A forms image with each color in yellow (Y), pinkish red (M), cyan (C) and the black (K).Therefore, be provided with four groups of toner image and form unit 1Y, 1C, 1M and 1K (hereinafter, additional character Y, C, M and the K in each reference number represents to be used for the member of yellow, magenta, cyan and black respectively).
Toner image forms unit 1Y, 1C, 1M and 1K and comprises that respectively the photo-sensitive cell as the image support thing rouses 11Y, 11C, 11M and 11K.In addition, each toner image formation unit 1Y, 1C, 1M and 1K also comprise a developing cell.At the upside place of toner image formation unit 1Y, 1C, 1M and 1K, be provided with and transmit the intermediate transfer unit 6 that the toner image that forms makes image overlay simultaneously.
Except that toner image formed unit 1Y, 1C, 1M and 1K, laser printer A comprised light writing unit 2, sheet feed tray 3 and 4, a pair of opposing roller 5.
Laser printer A comprise the intermediate transfer belt 12 that constitutes transfer printing unit 6 driven roller 6a, the second transfer roll 6b that is positioned at the position relative in second transfer printing unit with driven roller 6a, adopt the fixation unit 7 of band fixation method etc.Laser printer A comprises manual sheet feed tray MF.
Light writing unit 2 comprises among the figure light source that all do not show, polygon mirror, f-θ lens, catoptron etc., and shines the surface of each photo- sensitive cell drum 11Y, 11C, 11M and 11K when scanning based on view data.
Arrow among Fig. 1 is represented the transfer path of transfer paper 13.14 feed-ins of paper feed roller are from sheet feed tray 3 and 4 or from the transfer paper 13 of manual sheet feed tray MF.Then, transfer roller 15 transmits transfer paper 13, and simultaneously, the transhipment guide rail that does not have to show wherein is provided with the time-out position of resisting roller 5 with transfer paper 13 guiding.
After transfer paper 13 suspended in the state that has morphology between transfer roller 15 and opposing roller 5, opposing roller 5 located to transmit transfer paper 13 at the fixed time.On the surface of the transfer paper 13 that is transmitted, the toner image that is formed on the intermediate transfer belt 12 forms the color toner image under the squeezing action of the transfer electric field or the second transfer roll 6b.
After fixation unit 7 photographic fixing color toner images, form color toner image transfer paper 13 thereon by ejection roller 8.Then, transfer paper 13 is ejected into the laser printer A outside as imaging device.
As mentioned above, the laser printer A as imaging device is configured to four drum tandem type color image forming apparatus.
The colored structures of four drum tandem types can provide the imaging device with higher productivity and stable picture quality.
Feature to the embodiment of paper carrier 20 describes below.As shown in Figure 2, paper carrier 20 comprises the paper feed roller 14 that sends stacked paper 13 (as shown in Figure 1), it is set in order to prevent the friction pad 16 of supply paper 13 when the hanging togother.
When separating mechanism is located at paper feed roller 14 places that conduct sends the paper feed unit of stacked paper 13, and when this separating mechanism uses the friction pad method, can eliminate defective with minimum cost, thereby improve separating power and stable paper transfer quality is provided such as feed-in paper when the hanging togother.
Paper carrier 20 comprises the sensor (vertical transfer printing sensor 17) of transfer roller 15 and the transfer position that detects paper 13, and both all are located at the downstream part of paper feed roller 14.Fig. 2 has also shown opposing roller 5, the second transfer roll 6b, opposing sensor 18 and paper feed sensor 19.
Figure 3 shows that the front-view schematic diagram of the paper feed driver element that drives paper carrier.Figure 4 shows that the floor map of the paper feed driver element that drives paper carrier.In Fig. 3 and 4, the motor gear 27 (output unit of drive source) that the motor 21 that is provided as drive source is set up by motor 21 makes paper feed roller 14 and transfer roller 15 rotations, although for ease of understanding, the parts shown in Fig. 3 and 4 are not necessarily corresponding respectively.Strictly speaking, figure denote 14,15 is represented the direct axle that links to each other with transfer roller 15 with paper feed roller 14 respectively.Yet for simplicity, supposition figure denote 14,15 is represented paper feed roller and transfer roller respectively in the explanation below.
In this case, when as driving as the paper feed roller 14 of paper feed unit with as the motor of the driver element of the transfer roller 15 of delivery unit (paper feed-in and transmit motor) the 21st, during permanent magnetism (PM) type step motor, cost can be lowered.
In the drive sequences (gear, one-way clutch) that drives paper feed roller 14, be provided with first gear 24 and the unidirectional paper feed clutch coupling 22 that comprises gear z1 and gear z2.
In the two system drive sequences (gear, one-way clutch) that drive transfer roller 15, two one-way transmission clutch couplinges (the first and second one-way transmission clutch couplinges 23,23 ') are set on the same axis of transfer roller 15.That is to say that the axle of transfer roller 15 supports the first and second one-way transmission clutch couplinges 23 that are provided with one heart, 23 ' axle center.Second gear 25 and the 3rd gear 26 are located at a side of transfer roller 15.
Each unidirectional paper feed clutch coupling 22,23 and 23 ' structure are used the spring regulate and control method.Because this method itself is widely known by the people, so specify in this omission.When one-way clutch uses the driving blocking-up mechanism of machinery, allow to drive conversion reliably with least cost.
When with motor drive shaft in the gear of unidirectional paper feed clutch coupling 22 of motor gear 27 engagement be z1, and when being z2 with first gear, 24 meshed gears, the spring (not shown) that merges becomes winding direction when motor just changes, thereby driving force is passed to gear z1 or gear z2.
When motor reversed, spring became and loosens direction, so only gear z1 becomes idling conditions.The number of gear tooth with in second gear 25 that the number of the gear tooth of unidirectional paper feed clutch coupling 22 is made is identical, so the gear of two system gear arrays in the transfer roller 15 is than identical.Fig. 3 has also shown the 3rd gear 26.
Figure 5 shows that the synoptic diagram that when motor just changes, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.Figure 6 shows that the synoptic diagram that when motor reverses, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.
Among Fig. 5 and 6 each shown paper feed roller (axle) 14, transfer roller (axle) 15, as the motor 21 of drive source, unidirectional paper feed clutch coupling 22, the first and second one-way transmission clutch couplinges 23,23 ', first gear 24, second gear 25, the 3rd gear 26 and the 4th gear 25 '.In addition, each among Fig. 5 and 6 shown the motor gear (output unit) 27 that is installed on the motor 21 and gear z1, the z2 in the unidirectional paper feed clutch coupling 22.
In Fig. 5, when the motor (paper feed-in, transmission motor) 21 as drive source is just changeing, driving force is passed to paper feed roller 14 thereby unidirectional paper feed clutch coupling 22 becomes the locking direction.Change locking direction with the first one-way transmission clutch coupling 23 in the transfer roller 15 of the gear z2 engagement of the less gear unit that protrudes as the central portion place of gear z1 in unidirectional paper feed clutch coupling 22 downwards, thereby drive transfer roller 15.At this moment, by second an one-way transmission clutch coupling 23 that supports ' continuation idle running of transfer roller 15.
In Fig. 6, when motor 21 counter-rotatings, the unidirectional paper feed clutch coupling 22 and the first one-way transmission clutch coupling 23 dally.In this case, second gear 25 and the 3rd gear 26 make the second one-way transmission clutch coupling 23 ' for the locking direction, thereby only driving force are passed to transfer roller 15.
In the motion of the paper carrier in the actual imaging device, paper carrier is usually in the same time CD-ROM drive motor 21 that begins to print, and then, when sensor will arrive to the top of paper when resisting the gap, paper carrier stops motor 21.Make after motor 21 stops the schedule time, with the synchronous paper carrier of the transmission of opposing roller 5 (Fig. 2) motor 21 is carried out inversion driving only driving transfer roller 15 (Fig. 6), thereby avoid a piece of paper under the feed-in.
Below the position that one-way clutch is set is described.As illustrated in Figures 5 and 6, when unidirectional paper feed clutch coupling 22 being set with motor gear 27 engagement the time, second gear 25 that is positioned at the back downstream part becomes and can keep halted state when unidirectional paper feed clutch coupling 22 idle running.As a result, can reduce the necessary moment of torsion and the current value of motor 21, in addition, also be of value to the serviceable life of gear.
When the longer dimension of paper (paper), after the top of paper arrived the opposing gap, paper feed roller 14 was pushed down the rear end of paper.At this moment, when motor 21 along reverse rotation so that during transfer roller 15 rotation, the friction force that produces between the surface of paper feed roller 14 (Fig. 3) because of paper and paper feed roller 14 is rotated.This can cause first gear 24 just changeing, thereby driving force is passed to the transfer roller 15 of two systems.
Therefore, when paper feed roller 14 was pushed down the rear end of paper, even after the top of paper arrives the opposing gap, because of the longer dimension of paper, preferentially the last row (rotation the tip of the axis) at paper feed roller 14 located to be provided with one-way clutch.
Figure 7 shows that the synoptic diagram that when motor just changes, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.Figure 8 shows that the synoptic diagram that when motor reverses, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.
Among Fig. 7 and 8 each shown paper feed roller 14, transfer roller 15, motor 21, the first and second unidirectional paper feed clutch couplinges 28,29, the first and second one-way transmission clutch couplinges 23,23 as drive source ', second gear 25, the 3rd gear 26 and the 4th gear 25 '.In addition, each among Fig. 7 and 8 also shown the motor gear (output unit) 27 that is installed on the motor 21 and gear z1, the z2 in the unidirectional paper feed clutch coupling 28.
The first unidirectional paper feed clutch coupling 28 is located at first row in the drive sequences of paper feed roller 14.The second unidirectional paper feed clutch coupling 29 is located at the last row in the drive sequences of paper feed roller 14.At the two system drive sequences places that drive transfer roller 15, the first and second one-way transmission clutch couplinges 23,23 ' be located on the same axis of transfer roller 15.
Shown in Fig. 7 and 8, when one-way clutch 28 and 29 is located at first row of the drive sequences that is used for paper feed roller 14 respectively and arranges at last, can prevent that the paper transmission from driving, thus the serviceable life of gear during can helping reversing.
With the drive sequences engagement of the output shaft of motor 21 motor gear 27 that directly links to each other and driving blocking-up mechanism (one-way clutch), thereby can reduce load torque with machinery.The last row of paper feed unit (paper feed roller) 14 is manufactured the drive sequences of the driving blocking-up mechanism with machinery, thereby can prevent to transmit driving by paper.
The driving of the machinery in the drive sequences of paper feed roller 14 and transfer roller 15 blocking-up mechanism (one-way clutch) 28,29,23 and 23 ' at least one be arranged on drive source (motor) 21 in the position that directly links to each other of motor gear 27.So,, can reduce unnecessary load and the current value that is carried on the motor 21 with lower cost because the drive sequences except that the drive sequences relevant with the driving blocking-up mechanism (one-way clutch) of machinery all is in halted state.
In the paper carrier of the longer paper of feed-in, the driving of machinery blocking-up mechanism 29 is located at the last row of paper feed unit (paper feed roller) 14, thereby can prevent to transmit the driving from paper.
Figure 9 shows that the synoptic diagram that when motor just changes, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.Figure 10 shows that the synoptic diagram that when motor reverses, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.
Among Fig. 9 and 10 each shown paper feed roller 14, transfer roller 15, as motor 21, the first and second unidirectional paper feed clutch couplinges 28,29 of drive source and first, second and the 3rd one-way transmission clutch coupling 23,23 ' and 30.
In addition, each among Fig. 9 and 10 shown second gear 25 in gear z1, z2, the 3rd gear 26 and the 3rd one-way transmission clutch coupling 30 in motor gear 27, the first unidirectional paper feed clutch coupling 28 that is installed on the motor 21 and the 4th gear 25 '.
The first unidirectional paper feed clutch coupling 28 is located at first row in the drive sequences of paper feed roller 14.The second unidirectional paper feed clutch coupling 29 is located at the last row in the drive sequences of paper feed roller 14.
At the two system drive sequences places that drive transfer roller 15, the first one-way transmission clutch coupling 23 and the second one-way transmission clutch coupling 23 ' be located on the same axis of transfer roller 15.Same first row place in the drive sequences of transfer roller 15 is provided with the 3rd one-way transmission clutch coupling 30.
As mentioned above, will manufacture the drive sequences of driving blocking-up mechanism (one-way clutch), thereby allow to be reduced to the load torque of the moment of torsion that needs most that is used for drive source (motor) with each drive sequences of motor 21 engagements with machinery.
As shown in Figures 9 and 10, when first row place at transfer roller 15 also is provided with one-way clutch 30, also help the serviceable life that further reduces the required moment of torsion of motor, current value and be positioned at the gear array in downstream.
Figure 11 shows that the synoptic diagram that when motor just changes, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.Figure 12 shows that the synoptic diagram that when motor reverses, drives the paper feed driver element of paper carrier, be simplified illustration, in the overlapping mode that can easily see Fig. 4 middle gear it is illustrated at this.
Among Figure 11 and 12 each shown that gear 31 is located at the structure on the axle identical with unidirectional paper feed clutch coupling 22.Among Figure 11 and 12 each shown paper feed roller 14, transfer roller 15, motor 21, unidirectional paper feed clutch coupling 22 and the first and second one-way transmission clutch couplinges 23,23 as drive source '.In addition, each among Figure 11 and 12 shown the motor gear 27 that is installed on the motor 21, second gear 25, the 4th gear 25 ' and the 3rd gear 26.
Whether the driving blocking-up mechanism of machinery is that the one-way clutch of employing spring method or the one-way clutch of employing needle method are indiscriminate.Shown in Figure 11 and 12, when adopt using the one-way clutch of needle method, be provided with the gear 31 that links to each other with driving shaft on the identical axle of unidirectional paper feed clutch coupling 22.
Below the paper feed from manual paper carrier (MF among Fig. 1) is described.As mentioned above, the single-motor that does not have to show drives the paper feed roller 14 among manual paper carrier (dish) MF.
The transmission that is arranged in the downstream 1 in Figure 13 and 14 as described below is similar to as shown in Figure 6, and motor (paper feed-in, transmission motor) 21 drives transfer rollers 15.
Therefore, during manual paper feed, drive the motor 21 that transmits the transfer roller 15 in 1 and at any time carry out reverse drive.So, be fed on the opposing unit 5 from the paper of manual sheet feed tray feed-in.When manually the motor of the drive source of paper carrier is PM type step motor, allow to reduce cost.
When comparing, in manual paper carrier, be essential to the reaction capacity of paper from the paper feed of main body panel.Specifically, needing can the thick paper of feed-in.When the thick paper of manual paper carrier feed-in, the load torque of paper feed roller and transfer roller increases.So, when identical drive source drive roller, need big moment of torsion as the motor of drive source, thereby cause cost to increase.
According to the present invention, the reverse drive that comprises the motor of the unidirectional paper feed clutch coupling in the paper feed 1 drives transfer roller 15, wherein paper feed 1 is the paper feed that is in first section paper carrier of locating 3 among the laser printer A shown in Figure 1, and the manual feed motor that shows does not only drive manual paper feed roller, so but the permissible load moment of torsion promptly drives the load variation.
When using friction pad (reference number in Fig. 1 is 16) as the separating mechanism in the paper carrier, separating power is improved.Do not worry adding motor and can increase motor load as FRR.
As mentioned above, separating mechanism has adopted friction pad, thereby can keep the paper feed quality with low-cost and stable manner, can eliminate defective as feed-in paper when the hanging togother with minimum cost.
Figure 13 is a synoptic diagram, utilizes paper to arrive the embodiment of the transfer path of the laser printer among opposing roller state description Fig. 1 before.Figure 14 is a synoptic diagram, utilizes paper to arrive the embodiment of the transfer path of the laser printer among opposing roller state description Fig. 1 afterwards.
Paper feed to second section paper carrier of locating among the laser printer A shown in Figure 1 (sheet feed tray 4 among Fig. 4) describes below.The structure of having done explanation among its drives structure and Fig. 3 to 6 is identical.Figure 13 and 14 explanation paper feed, simultaneously first section paper feed of locating (sheet feed tray 3 at the upside place among Fig. 1) is defined as paper feed 1 and its CD-ROM drive motor is defined as motor 1, second section paper feed of locating (sheet feed tray 4 at the downside place among Fig. 1) is defined as paper feed 2 and its CD-ROM drive motor is defined as motor 2.
Figure 13 and 14 is defined as paper feed 1 with first section paper feed of locating (sheet feed tray 3 at the upside place among Fig. 1).Paper feed 1 comprises one-way clutch, motor 1, paper feed roller 14 and the transfer roller 15 that does not have demonstration.Figure 13 and 14 is defined as paper feed 2 with second section paper feed of locating (sheet feed tray 4 at the downside place among Fig. 1).In addition, paper feed 2 comprises one-way clutch, motor 2, paper feed roller 14 and the transfer roller 15 that does not have demonstration.
In Figure 13 and 14 each also shown the paper feed roller 14, opposing unit 5, the driven roller 6a that constitutes the intermediate transfer belt of transfer printing unit, second transfer printing unit 6 of manual paper carrier (dish) MF ' in the second transfer roll 6b, fixation unit 7 and the paper delivery unit 8 that are positioned at the position relative with driven roller 6a.
Motor 1 reverse drive, motor 2 forward drive are till paper arrives the opposing gap (seeing Figure 13).After paper arrives opposing place, be fed into second transfer printing unit 6 ' in the second transfer printing gap time, each counter-rotating (seeing Figure 14) in the motor 1 and 2.
When the size of paper hour, if the rear end of paper before the front end of paper arrives the opposing gap through the paper feed roller, have the defective (two adjacent paper are by feed-in) of continuous feed-in so.In this case, when the front end of paper was between transfer roller 15 and opposing roller 5, the motor 2 after just changeing just stopped with counter-rotating.
At this moment because transmit 1 identical with the reduction gear ratio of two systems that transmit the transfer roller in 2, so to locate with 2 per second driving pulse (PPS) the value time in office all be identical to motor 1.When reduction gear ratio differed from one another, though first and second transmission have identical transfer rate, each in the motor 1 and 2 must have different driving pulses, thereby caused complicated control.
When reduction gear ratio differs from one another, because driving pulse and reduction gear ratio differ from one another, can not obtain identical actuating speed, thereby produce adverse influence transmitting quality.According to the present invention, can address this problem, thereby can drive with identical transfer rate with identical driving pulse.
In this case, quicken transfer rate and arrive opposing place, cause the raising of throughput rate and the raising of imaging device throughput rate up to paper.
In this embodiment, because the number of the roller of each motor driven reduces, so the load torque that is carried on the motor reduces.So, help utilizing having undersized cheap PM type step motor.
In the time of in embodiments of the invention being applied to four drum tandem type color image forming apparatus, can provide imaging device with high productivity and stable picture quality.
Below to describing according to a second embodiment of the present invention.Figure 15 shows that the synoptic diagram of imaging device according to a second embodiment of the present invention.Because its basic structure is identical with imaging device shown in Figure 1, thus at this identical digital reference corresponding to identical part, and omit unnecessary explanation.In imaging device, because sheet feed tray has bigger volume, so that transfer path becomes is longer according to second embodiment among Figure 15.
So, except transfer roller 15a, 15b, also be provided with between transfer roller 15a and 15b, transport pass on roller 32, this transfer roller 15a, 15b will send opposing roller 5 to from paper feed roller 14a, 14b in the paper feed section or from the paper among the paper feed roller 14d among the manual sheet feed tray MF respectively.Drive with the drive source at the preceding paragraph place and to pass on roller 32.
Figure 16 shows that the synoptic diagram when imaging device in second embodiment among Figure 15 is equipped with the expansion dish on it.Because its basic structure is identical with imaging device shown in Figure 1, thus append to identical part at this identical digital reference, and omit unnecessary explanation.
As shown in figure 16, even in 4 ' time of expansion dish, be installed thereon, also will receive from as the driving force of the motor (not shown) of the drive source of the second paper feed section pass on roller 32b be arranged on expansion dish 4 ' transfer roller 15c and the transfer roller 15b of the second paper feed section between.In Figure 16, the paper feed roller of each section is represented with reference number 14a, 14b and 14c respectively.Manually the paper feed roller among the sheet feed tray MF is denoted as 14d.The transfer roller of each section is denoted as 15a, 15b and 15c respectively.The roller that passes on is denoted as 32a, 32b.
Figure 17 shows that the floor map that when motor just changes, drives the paper feed driver element of paper carrier in second embodiment among Figure 15.Figure 18 shows that the floor map that when motor reverses, drives the paper feed driver element of paper carrier in second embodiment among Figure 15.
In the paper feed driver element in Figure 17 and 18, pack into one-way clutch in the gear 24 on the paper feed roller 14 and the gear 23,23 on the transfer roller 15 ' in.The position that one-way clutch is set can be used in any drive sequences structure shown in first embodiment.
Figure 19 is a synoptic diagram, and it illustrates when motor is driven, and each roller in the paper feed driver element in second embodiment among Figure 15 is in the sense of rotation at transfer path place.Figure 19 does not show one-way clutch.Yet being provided with in the setting of each roller and the imaging device shown in Figure 16 is identical.Therefore, append to identical part, and omit unnecessary structure, the explanation of motion at this identical digital reference.
In addition, in Figure 17～19, driving force passed to pass in the drive sequences that the gear 33,34 of roller 32 further is positioned in the transfer roller 15.When motor was just changeing shown in Figure 17 and 19, paper feed roller 14 (14a, 14b), transfer roller (15a, 15b) were along the paper feeding direction transmission.
At this moment, pass on roller 32 (32a, 32b) with respect to the paper feeding direction reverse drive.On the other hand, when motor reverses shown in Figure 18 and 19, transfer roller 15 (15a, 15b) and pass on roller 32 (32a, 32b) along the paper feeding direction transmission.
As shown in figure 17, when motor just changes, pass on roller 32 along the direction rotation opposite with respect to paper feeding direction.Yet, at this moment, because do not send the paper of lower paper feed section certainly, so there be not any problem relevant with paper feeding.
Figure 20 shows that the floor map of the paper feed driver element of the paper carrier that when motor just changes, drives the relaying delivery unit that the driving blocking-up mechanism with the machinery in drive sequences is housed.Shown in Figure 21 for when motor reverses, driving the floor map of the paper feed driver element of paper carrier with the relaying delivery unit among Figure 20.
Structure among Figure 20 and 21 is identical with structure in Figure 17 and 18.Therefore, append to identical part, and omit the unnecessary structure or the explanation of motion at this identical digital reference.In this structure, when when motor just changes, not driving the torque margin of three rollers 14,15 and 32, in the gear shown in Figure 20 and 21 34, adopt one-way clutch.
When motor just changeed, paper feed roller 14 and transfer roller 15 were driven.When motor reversed, the transfer roller 15 and the roller 32 that passes on were driven.So, at any time all can allow two roller rotations, thereby can reduce the load torque that is carried on the motor.
With transfer roller 15 with pass on the roller external diameter of roller 32 and manufacture identically, in addition, will make that its reduction gear ratio is identical, thereby can stablize transfer rate and allow shared components and reduce cost
According to some aspect of the present invention, drive source is not provided with the driving blocking-up mechanism of electricity such as the electromagnetic clutch in the drive sequences of paper feed unit, delivery unit and alignment unit.So, can solve defective, and can at any time keep stable paper feeding ability as slip in the electromagnetic clutch or corotation.Make that the reduction gear ratio of two system drive sequences in the delivery unit is identical, thereby can keep the stable moment of torsion of drive source (motor) as possible, thereby simplify control table and balance transfer rate.
Though for fully, clearly openly use embodiment the present invention will be described, but attached claim is therefore not limited, it should be regarded as comprise that those skilled in the art find out thus obviously fall within all changes and optional structure in this basic theory of illustrating.
Claims (17)
1. imaging device comprises:
Go up the image-generating unit (1) that forms toner image at photo-sensitive cell (11);
To be formed on toner image on the photo-sensitive cell (11) and be transferred to transfer printing unit (6) on the recording medium (13);
Photographic fixing is transferred to the fixation unit (7) of the toner image on the recording medium (13);
The feed-in unit (14) of feed-in recording medium (13) one by one;
Be located at the downstream of feed-in unit (14) and recording medium (13) sent to the delivery unit (15) of transfer printing unit (6);
Be located at the downstream of delivery unit (15) and change the alignment unit (5) that recording medium (13) is fed into the time of transfer printing unit (6);
Drive the driver element (21) of feed-in unit (14), delivery unit (15) and alignment unit; And
Driving force is passed to the common drive source of the driver element that drives feed-in unit (14) and delivery unit (15), it is characterized in that,
Described drive source is the motor that rotates forward or backwards,
Described feed-in unit (14) is included in the driving blocking-up mechanism of the machinery in its drive sequences,
Described delivery unit (15) comprises the drive sequences of two systems, always and have for making no matter the sense of rotation of described drive source how described delivery unit along the driving blocking-up mechanism of the machinery of a direction rotation, and
The reduction gear ratio of each drive sequences in the described delivery unit (15) is identical.
2. imaging device as claimed in claim 1 is characterized in that, described drive source comprises at least one output unit that is meshed in the drive sequences with the driving blocking-up mechanism with machinery.
3. imaging device as claimed in claim 1 is characterized in that,
The drive source of described feed-in unit (14) and delivery unit (15) comprises with having mechanical driving blocks the output unit of at least one engagement in the drive sequences of mechanism, and
The driving blocking-up mechanism of machinery is located at the back segment place of described feed-in unit (14).
4. imaging device as claimed in claim 1 is characterized in that,
Described drive source comprises output unit, and
Comprise the driving blocking-up mechanism of machinery with all drive sequences of the output unit of described drive source engagement.
5. as arbitrary described imaging device in the claim 1 to 4, it is characterized in that the transfer rate after the described feed-in unit (14) till the front end of the recording medium (13) of described feed-in unit (14) feed-in arrives described alignment unit and the transfer rate of described delivery unit (15) arrive described alignment unit greater than the front end of described recording medium (13).
6. imaging device as claimed in claim 1 also comprises:
The manual manual feed-in unit (MF) of feed-in recording medium (13) one by one; With
Comprise the driver element in the drive source that is used to drive manual feed-in unit (MF), it is characterized in that,
Described delivery unit (15) is located at the downstream part of the recording medium (13) of described manual feed-in unit (MF) feed-in.
7. imaging device as claimed in claim 6 is characterized in that,
At least one engagement in the identical drive source drives sequence of use of the driver element of described driving feed-in unit (14) and delivery unit (15) and driving blocking-up mechanism with machinery, and
The driving of described machinery blocking-up mechanism is located at the back segment place of described feed-in unit (14).
8. imaging device as claimed in claim 6 is characterized in that,
The drive source of described feed-in unit (14) and delivery unit (15) comprises output unit, and
The drive sequences of the output unit engagement of the drive source of all and described feed-in unit (14) and delivery unit (15) comprises the driving blocking-up mechanism of machinery.
9. imaging device as claimed in claim 6, it is characterized in that the transfer rate after the described manual feed-in unit (MF) till the front end of the recording medium (13) of described manual feed-in unit (MF) feed-in arrives described alignment unit and the transfer rate of delivery unit (15) arrive described alignment unit greater than the front end of described recording medium (13).
10. as arbitrary described imaging device in the claim 1 to 9, it is characterized in that described feed-in unit (14) and delivery unit (15) have separating mechanism.
11. imaging device as claimed in claim 10 is characterized in that, described separating mechanism is a friction pad.
12., it is characterized in that the driving blocking-up mechanism of described machinery is an one-way clutch as arbitrary described imaging device in the claim 1 to 9.
13., it is characterized in that the drive source of described feed-in unit (14), delivery unit (15) and manual feed-in unit (MF) is the permanent-magnet type step motor as arbitrary described imaging device in the claim 6 to 9.
14., it is characterized in that described imaging device is four drum tandem type color image forming apparatus as arbitrary described imaging device in the claim 1 to 13.
15. as arbitrary described imaging device in the claim 1 to 14, it is characterized in that,
Described feed-in unit (14) is set in a plurality of sections,
Described imaging device also comprises the relaying delivery unit (32) that is arranged between feed-in unit hypomere and the feed-in unit epimere, and
Described relaying delivery unit (32) is driven by the drive source of the feed-in unit of described epimere.
16. imaging device as claimed in claim 15 is characterized in that, described relaying delivery unit (32) is included in the driving blocking-up mechanism of the machinery in the described drive sequences.
17. as claim 15 or 16 described imaging devices, it is characterized in that,
The external diameter of described delivery unit (15) is identical with the external diameter of described relaying delivery unit (32), and
Described delivery unit (15) is identical with the reduction gear ratio of the drive sequences of relaying delivery unit (32).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-052086 | 2007-03-01 | ||
| JP2007052086 | 2007-03-01 | ||
| JP2007173185A JP4928369B2 (en) | 2007-03-01 | 2007-06-29 | Image forming apparatus |
| JP2007-173185 | 2007-06-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101303541A true CN101303541A (en) | 2008-11-12 |
| CN101303541B CN101303541B (en) | 2010-09-29 |
Family
ID=39911138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100825333A Expired - Fee Related CN101303541B (en) | 2007-03-01 | 2008-02-26 | Image forming apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (2) | JP4928369B2 (en) |
| CN (1) | CN101303541B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649514A (en) * | 2011-02-28 | 2012-08-29 | 株式会社理光 | Paper feeding device and image forming device |
| CN106315314A (en) * | 2015-07-03 | 2017-01-11 | 山东新北洋信息技术股份有限公司 | Paper distribution mechanism and slice type medium processing device using paper distribution mechanism |
| CN109956346A (en) * | 2017-12-26 | 2019-07-02 | 精工爱普生株式会社 | Medium feeding apparatus and image read-out |
| CN110550472A (en) * | 2018-06-01 | 2019-12-10 | 夏普株式会社 | Sheet conveying apparatus, image forming apparatus including the same, and sheet conveying method |
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| JP5537376B2 (en) * | 2010-10-08 | 2014-07-02 | 株式会社沖データ | Paper feeder |
| JP5867900B2 (en) | 2011-11-22 | 2016-02-24 | 株式会社リコー | Paper feeding device and image forming apparatus |
| JP5971470B2 (en) * | 2012-08-08 | 2016-08-17 | セイコーエプソン株式会社 | Recording device |
| JP6160311B2 (en) * | 2013-07-04 | 2017-07-12 | セイコーエプソン株式会社 | Sheet supply apparatus and image forming apparatus |
| JP6398511B2 (en) | 2014-09-17 | 2018-10-03 | 富士ゼロックス株式会社 | Drive mechanism and image forming apparatus |
| JP6467987B2 (en) * | 2015-02-26 | 2019-02-13 | セイコーエプソン株式会社 | Conveying apparatus and image reading apparatus |
| JP6674650B2 (en) * | 2015-09-02 | 2020-04-01 | 株式会社リコー | Driving device and image forming apparatus |
| JP7272030B2 (en) * | 2019-03-19 | 2023-05-12 | セイコーエプソン株式会社 | Ribbon feeding mechanism and tape printer |
| JP7259442B2 (en) * | 2019-03-19 | 2023-04-18 | セイコーエプソン株式会社 | Ribbon feeding mechanism and tape printer |
| JP6775661B1 (en) * | 2019-12-19 | 2020-10-28 | 株式会社Pfu | Media transfer device, control method and control program |
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| JPS63300044A (en) * | 1987-05-29 | 1988-12-07 | Toshiba Corp | Image forming device |
| JPH0813563B2 (en) * | 1987-09-30 | 1996-02-14 | 富士通株式会社 | Printer |
| JPH0275548A (en) * | 1988-09-09 | 1990-03-15 | Hitachi Ltd | Paper feeding device for transmitting/receiving facsimile |
| JPH05319616A (en) * | 1992-05-22 | 1993-12-03 | Murata Mach Ltd | Image forming device |
| JP3849963B2 (en) * | 1999-09-14 | 2006-11-22 | 長野日本無線株式会社 | Paper transport method for printing apparatus |
| JP3920017B2 (en) * | 2000-10-06 | 2007-05-30 | 株式会社リコー | Image forming apparatus |
| JP3959948B2 (en) * | 2000-10-11 | 2007-08-15 | 富士ゼロックス株式会社 | Drive system and paper feeder using the system |
| JP3580246B2 (en) * | 2000-11-13 | 2004-10-20 | ブラザー工業株式会社 | Image forming device |
| JP2002193462A (en) * | 2000-12-27 | 2002-07-10 | Canon Inc | Sheet carrying device and image forming device |
| JP3782721B2 (en) * | 2000-12-28 | 2006-06-07 | 株式会社リコー | Paper feeding device and image forming apparatus |
| JP2005247463A (en) * | 2004-03-02 | 2005-09-15 | Matsushita Electric Ind Co Ltd | Paper feed control method for image formation device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649514A (en) * | 2011-02-28 | 2012-08-29 | 株式会社理光 | Paper feeding device and image forming device |
| CN102649514B (en) * | 2011-02-28 | 2015-07-08 | 株式会社理光 | Paper feeding device and image forming device |
| CN106315314A (en) * | 2015-07-03 | 2017-01-11 | 山东新北洋信息技术股份有限公司 | Paper distribution mechanism and slice type medium processing device using paper distribution mechanism |
| CN106315314B (en) * | 2015-07-03 | 2018-07-06 | 山东新北洋信息技术股份有限公司 | A kind of paper distributing mechanism and the laminated medium processing unit using the paper distributing mechanism |
| CN109956346A (en) * | 2017-12-26 | 2019-07-02 | 精工爱普生株式会社 | Medium feeding apparatus and image read-out |
| CN109956346B (en) * | 2017-12-26 | 2021-08-20 | 精工爱普生株式会社 | Medium feeding device and image reading device |
| CN110550472A (en) * | 2018-06-01 | 2019-12-10 | 夏普株式会社 | Sheet conveying apparatus, image forming apparatus including the same, and sheet conveying method |
| CN110550472B (en) * | 2018-06-01 | 2021-08-31 | 夏普株式会社 | Sheet conveying apparatus, image forming apparatus including the same, and sheet conveying method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012133385A (en) | 2012-07-12 |
| JP5387704B2 (en) | 2014-01-15 |
| JP2008239343A (en) | 2008-10-09 |
| JP4928369B2 (en) | 2012-05-09 |
| CN101303541B (en) | 2010-09-29 |
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