CN101386236A - Sheet adsorption device, transport device, and image forming apparatus - Google Patents
Sheet adsorption device, transport device, and image forming apparatus Download PDFInfo
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- CN101386236A CN101386236A CNA2008101296962A CN200810129696A CN101386236A CN 101386236 A CN101386236 A CN 101386236A CN A2008101296962 A CNA2008101296962 A CN A2008101296962A CN 200810129696 A CN200810129696 A CN 200810129696A CN 101386236 A CN101386236 A CN 101386236A
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Abstract
The invention provides a sheet adsorption device, a transport device and an image forming apparatus, for obtaining stable adsorbability, and little noises caused by air flowing and alternation of the load of a negative pressure generating mechanism and reduced power consumption, independent of the size and gradient of the adsorbent sheet. A flow path shifting unit (70) selects the section of the flow path according to the presence of recording media for covering a suction hole (42). Accordingly, air flow at the suction hole (42) not covered by the recording media is relatively reduced, therefore, no matter of the size and the gradient of the adsorbent sheet, stable adsorbability is obtained, the sheet adsorption device (30) is obtained, wherein the noises and alternation of the adsorbent load caused by air flow are reduced.
Description
Technical field
The present invention relates to sheet adsorption device and used its conveying device, used these image processing system.
Background technology
As the device of sheets such as absorption recording medium, knowing has the negative pressure utilized to produce the device that mechanism attracts the single face of sheet.In addition, know the device that utilized electrostatic force is arranged, to have utilized device by the method for pressing tablets such as magnet.
By negative pressure produce influence that device that mechanism attracts sheet causes at static to electric parts few aspect, because there is not magnet etc. in the single face of sheet, therefore, the aspect etc. that the roughly whole zone of the single face of sheet can be used in printing etc. is superior.
Know to have and be formed with on the gripper shoe of a plurality of airports, poriferous zone with the porose adsorption plane that is formed with a plurality of airports is moved, utilizing negative pressure to produce mechanism attracts via the airport that is formed at gripper shoe, at porose adsorption plane fixedly the adsorption section of recording medium (for example, with reference to patent documentation 1).
If all attract often about a plurality of airports, then under the situation of the size variation of the recording medium on the porose adsorption plane, the airport that is covered by recording medium and the rate of change of unlapped airport can not get stable adsorption effect, or producing air stream, noise increases.Therefore, on poriferous zone, set a plurality of porose adsorption plane in advance corresponding to the size of recording medium.
No. 3707640 specification of [patent documentation 1] Japan Patent (4 pages～5 pages, Fig. 3)
Size at recording medium does not correspond under the situation of the porose adsorption plane that sets in advance, or recording medium tilts and under the situation about departing from from porose adsorption plane, can not get stable adsorption effect, or produce air stream, increases noise.In addition, the load variations to negative pressure generation mechanism needs superfluous electric power.
Summary of the invention
The present invention makes in order to address the above problem at least a portion, realizes by following mode or suitable example.
[being suitable for example 1]
A kind of sheet adsorption device is characterized in that, possesses: the sheet adsorption plane; Attract the hole, it is arranged at described adsorption plane; The stream switching mechanism, it has or not according to the sheet that covers described attraction hole, switch first state and second state of the connection stream that is communicated with described attraction hole, described second state is that the stream sectional area is littler than described first state, and the state of not inaccessible described connection stream.
According to this suitable example as can be known, the stream sectional area that is communicated in not the connection stream in the attraction hole that is covered by sheet is compared with the size of the stream sectional area of the connection stream that is communicated in the attraction hole that is covered by sheet and is diminished.In addition, the stream switching mechanism is selected the stream sectional area according to the having or not of sheet that cover to attract the hole, and therefore, the gas flow at the place, attraction hole that is covered by sheet does not tail off.On the other hand, in the attraction hole that is covered by sheet, be communicated with stream not by obturation, therefore, gas flow takes place hardly, and the change of the load of attraction is few.Thereby the size of the sheet that no matter adsorbs, gradient all obtain stable absorption affinity, and the change of load that obtains the mobile noise that causes of air and attraction is few, consumes the sheet adsorption device that electric power reduces.
[being suitable for example 2]
In above-mentioned sheet adsorption device, it is characterized in that described stream switching mechanism possesses: the first static pressure unit, it is communicated with described attraction hole; The second static pressure unit, it is communicated with the described first static pressure unit; Valve, it partly opens and closes the described connection stream between described first static pressure unit and the described second static pressure unit according to the pressure reduction of described first static pressure unit and the described second static pressure unit.
In this suitable example, when attracting Kong Wei to be covered by sheet, the pressure that approaches in the atmospheric first static pressure unit becomes greater than the pressure in the second static pressure unit that attracts.Because partly open and close the valve that is communicated with stream, the stream sectional area of the gas between the first static pressure unit and the second static pressure unit diminishes, therefore, diminish from the gas flow that attracts orifice flow to go into.On the other hand, when attracting the hole to be covered, diminish from the gas flow that attracts orifice flow to go into by sheet.On the other hand, when attracting the hole to be covered by sheet, come the gas flow in self-gravitation hole roughly to be interdicted, therefore, the pressure in the first static pressure unit and the second static pressure unit becomes roughly the same negative pressure, the absorption sheet.Thereby, the main attraction hole that covered by sheet of attracting, the size of the sheet that no matter adsorbs, gradient all obtain stable absorption affinity, and the change of load that obtains the mobile noise that causes of air and attraction is few, consumes the sheet adsorption device that electric power reduces.
[being suitable for example 3]
In above-mentioned sheet adsorption device, it is characterized in that described connection stream has: the first stream portion and the second stream portion, described valve opens and closes described first-class road portion.
In this suitable example, valve opens and closes the first stream portion, therefore, is communicated with stream and is communicated with in the second stream portion.Thereby,, also regulate the pressure at the place, valve both sides that is communicated with in the stream easily by the second stream portion even under the state of shut off valve.
[being suitable for example 4]
In above-mentioned sheet adsorption device, it is characterized in that described valve has: the barrier film that between described first static pressure unit and the described second static pressure unit, is provided with.
In this suitable example, therefore valve, constitutes the stream switching mechanism with simple structure by the connection stream of the open first static pressure unit, membrane portions ground and the second static pressure unit.Thereby it is small-sized, slim that the stream switching mechanism becomes, and obtains small-sized, slim sheet adsorption device.
[being suitable for example 5]
In above-mentioned sheet adsorption device, it is characterized in that described stream switching mechanism possesses: first plate-shaped member, it is formed with the breakthrough part that constitutes the described first static pressure unit; Second plate-shaped member, it is formed with the breakthrough part that constitutes the described second static pressure unit; The 3rd plate-shaped member, it is disposed between described first plate-shaped member and described second plate-shaped member, and is formed with described barrier film.
In this suitable example, the stream switching mechanism is made of the stacked simple structure that forms by plate-shaped member, therefore, when selecting the attraction hole that is covered by sheet, need be from the electric power of outside.Thereby being reduced consumes the sheet adsorption device of electric power.In addition, constitute the stream switching mechanism by stepped construction, therefore, it is small-sized, slim that the stream switching mechanism becomes, and obtains small-sized, slim sheet adsorption device.
[being suitable for example 6]
In above-mentioned sheet adsorption device, it is characterized in that, described barrier film by at least one direction by the support portion of dual-gripper, with a described at least direction roughly on the direction of quadrature by the matrix of dual-gripper in described the 3rd plate-shaped member.
In this suitable example, valve has so-called universal joints structure, and therefore, when barrier film moved, barrier film was few with respect to the situation that gas flow tilts.Thereby, control gas flow well by the barrier film repeatability, selected the sheet adsorption device in the attraction hole that covered by sheet reliably.
[being suitable for example 7]
In above-mentioned sheet adsorption device, it is characterized in that described barrier film has: the through hole that is used under described second state, connecting described first static pressure unit and the described second static pressure unit.
In this suitable example, by changing the size of through hole, the effect of the mobile barrier film that causes of adjustments of gas is selected not cover when attracting the hole and the effect of the suitable barrier film in when covering corresponding to sheet.Thereby, selected the sheet adsorption device in the attraction hole that covered by sheet reliably.
[being suitable for example 8]
In above-mentioned sheet adsorption device, it is characterized in that described stream switching mechanism possesses: first plate-shaped member, it is formed with the breakthrough part that constitutes the described first static pressure unit; Second plate-shaped member, it is formed with the breakthrough part that constitutes the described second static pressure unit; The 3rd plate-shaped member, it is disposed between described first plate-shaped member and described second plate-shaped member, and is formed with described barrier film; The 4th plate-shaped member, it is clamped between described second plate-shaped member and described the 3rd plate-shaped member, and the 4th plate-shaped member is formed with the breakthrough part of the valve cap that constitutes described valve.
In this suitable example, be not with base material processing and form valve cap, but the stacked plate-shaped member that is formed with breakthrough part form, therefore, improve form accuracy, also reduce cost.
[being suitable for example 9]
In above-mentioned sheet adsorption device, it is characterized in that, described valve has: can the configuration of displacement ground between the first static pressure unit and the described second static pressure unit valve body, the grant power of this valve body by force application part often with described connection stream to the direction application of force that is in described first state, and, under the situation of pressure reduction above the power of granting of described force application part of described first static pressure unit and the described second static pressure unit, overcome this and grant power, make described connection stream to the direction displacement that is in described second state.
In this suitable example, make by the valve body of the force application part application of force by pressure reduction according to the first static pressure unit and the second static pressure unit, change the stream sectional area that is communicated with stream.Therefore, constitute the stream switching mechanism with simple structure.That is, when attracting Kong Wei to be covered by sheet, the pressure that approaches in the atmospheric first static pressure unit becomes bigger than the pressure in the first static pressure unit that attracts.Therefore, the pressure reduction of the first static pressure unit and the second static pressure unit surpass force application part grant power the time, valve body overcomes the power of granting of force application part and to the direction displacement that becomes second state that the stream sectional area that is communicated with stream diminishes, reduces from the gas flow that attracts orifice flow to go into.On the other hand, when attracting the hole to be covered by sheet, roughly interdict from attracting the gas flow of orifice flow in the first static pressure unit, therefore, the pressure of the first static pressure unit and the second static pressure unit becomes about equally.Therefore, the power of granting of force application part becomes greater than the negative pressure that acts on valve body, grants power based on this, and valve body is to the direction displacement that increases the stream sectional area that is communicated with stream.Thereby, can suppress attraction from the attraction hole that is not covered by sheet, and, can suitably give attraction to sheet.
Be suitable for example 10]
In above-mentioned sheet adsorption device, it is characterized in that, described valve has valve seat, this valve seat makes the power of granting that overcomes described force application part, and with the described valve body that described connection stream has carried out displacement to the direction that is in described second state position that falls, at least one side in described valve body and described valve seat is provided with interconnecting part, and this interconnecting part is used for making under described second state described first static pressure unit and the described second static pressure unit to be communicated with.
In this suitable example, by at least one square one-tenth interconnecting part in valve body and valve seat, even under the situation of the direction displacement of second state that becomes the stream sectional area that reduces to be communicated with stream, also the first static pressure unit and the second static pressure unit are communicated with via interconnecting part at valve body.Thereby, constitute the stream switching mechanism with simple structure.
[being suitable for example 11]
A kind of conveying device, it is adsorbed in the sheet adsorption plane with sheet and carries, and it is characterized in that possessing: the travel mechanism of described adsorption plane; Described sheet adsorption device.
According to this suitable example as can be known, possess above-mentioned sheet adsorption device, therefore, the size of the sheet that no matter adsorbs, gradient all obtain stable absorption affinity, and the change of load that obtains the mobile noise that causes of air and attraction is few, consumes the conveying device that electric power reduces.
[being suitable for example 12]
A kind of image processing system, it forms image on sheet, it is characterized in that, possesses: described sheet adsorption device or described conveying device.
According to this suitable example as can be known, possess above-mentioned sheet adsorption device or conveying device, therefore size, the gradient of the sheet that no matter adsorbs all obtain stable absorption affinity, the change of load that obtains the mobile noise that causes of air and attraction is few, consumes the image processing system that electric power reduces.
In addition, under the situation of the large-scale image processing system of the use roller paper that does not use conveying device, also in the direct adsorption roller paper of sheet adsorption device, carry, obtain identical effect thus.
Description of drawings
Fig. 1 is the overall structure block diagram of the image processing system of first embodiment.
Fig. 2 is the summary partial perspective view of image processing system.
Fig. 3 is the summary section of image processing system.
Fig. 4 is the exploded stereogram of sheet adsorption device.
Fig. 5 is the stereogram from the band of sheet adsorption plane side observation and band gripper shoe.
Fig. 6 is the enlarged drawing of valve.
Fig. 7 is the part sectioned view of sheet adsorption device.
Fig. 8 is near the amplification profile the stream switching mechanism.
Fig. 9 is the summary section of the image processing system of second embodiment.
Figure 10 is the summary section of the static pressure control part of the 3rd embodiment.
Figure 11 is near the amplification profile of stream switching mechanism of variation 1.
Figure 12 is near the amplification profile of stream switching mechanism of variation 2.
Figure 13 (a) is the stereogram from the valve body of the variation 3 of top observation, (b) is the stereogram from the described valve body of beneath.
Figure 14 (a) is the stereogram from the valve body of the variation 4 of top observation, (b) is the stereogram from the described valve body of beneath.
Figure 15 (a) is the stereogram from the valve body of the variation 5 of top observation, (b) is the stereogram from the described valve body of beneath.
Among the figure: 10-jet head liquid; 11-black liquid; 20,85-conveying device; 30,66,80-sheet adsorption device; 40-as the band of travel mechanism; 41,612-sheet adsorption plane; 42,613-attraction hole; 50-fan; 61,68-as the band gripper shoe of first plate-shaped member; 62,75-as the valve plate of the 3rd plate-shaped member; 63-as the sept plate of the 4th plate-shaped member; 64,69-as the main body of second plate-shaped member; 762,810,820,830-valve body; 70,73,74-stream switching mechanism; 71-as the feeding-in roll of travel mechanism; 72-as the paper takers-in of travel mechanism; 100,200-image processing system; 600-connection stream; 611,682-the first static pressure unit; 76,620-valve; 621,750-barrier film; 622-support portion; 623-the first arm; 624-the second arm; 625-through hole; 630-as the breakthrough part of valve cap; 640,691-the second static pressure unit; 684-bearing surface; 685-valve seat; 764-as the spring of force application part; 686-as the intercommunicating pore of interconnecting part; 812-as recessed of interconnecting part; 821-as the through hole of interconnecting part; S-as the recording medium of sheet.
The specific embodiment
Below, based on accompanying drawing, embodiment is described.
(first embodiment)
Fig. 1 represents the overall structure block diagram of the image processing system 100 of present embodiment.
Control conveying device 20 and jet head liquids 10 from the image processing system 100 of accepting printed data as the computer 300 of external device (ED) by controller 90, form image at recording medium S as sheet.In addition, form situation in the device 100 by detector set 110 monitoring pictures, based on this testing result, controller 90 control conveying device 20 and jet head liquids 10.
Fig. 2 is the summary partial perspective view of the image processing system 100 of present embodiment.The summary section of image processing system 100 has been shown among Fig. 3 in addition.
In Fig. 2, image processing system 100 possesses a plurality of jet head liquids 10 and conveying device 20.The image processing system 100 of present embodiment is the so-called device that is called line printer, is to spray black liquid, and the coloured image that forms image forms device.In Fig. 2, do not describe all liq injector head 10.
Show the throughput direction of recording medium S among Fig. 2 with white arrow.Recording medium S utilizes conveying device 20 to carry.
In Fig. 2, jet head liquid 10 is disposed at and utilizes the opposed position of single face of the recording medium S of conveying device 20 conveyings.Also have, jet head liquid 10 with the direction of the throughput direction quadrature of recording medium S on form row and arrange four lines.Two row constitute one group in the four lines, and the arranged spaced of one group two row is narrow, and two groups arranged spaced is broad.
In addition, the configuration of one group two row jet head liquids 10 is as described below, that is: delegation with respect to another capable along with the direction of the throughput direction quadrature of recording medium S on wrongly block and arrange, be configured to so-called staggered.
In Fig. 3, conveying device 20 possesses: donor rollers 21, door roller (gate roll) 22, air roll 23 and driven roller 24.Among the figure, represent the direction of rotation of roller with solid arrow.
Recording medium S sends in the conveying device 20 by donor rollers 21.Secondly, recording medium S delivers to sheet adsorption device 30 by door roller 22 and air roll 23.
Recording medium S is adsorbed in sheet adsorption device 30, is transported to from the position of the black liquid 11 of jet head liquid 10 ejections by conveying device 20.
With 40 driven roller 24 and the driven vollers 25,26 that are erected at spaced reciprocally configuration, being set to can be to rotation counterclockwise.
In Fig. 2 and Fig. 3, the single face with 40 is a sheet adsorption plane 41, is formed with a plurality of attractions hole 42 at sheet adsorption plane 41.Attract hole 42 on 40 throughput direction, to form row disposing with 40.Staggering on throughput direction and dispose in the attraction hole 42 of adjacent row, is set to so-called staggered.Attract hole 42 to be arranged on the roughly whole zone with 40 sheet adsorption plane 41.
Recording medium S is adsorbed in sheet adsorption plane 41, is transferred by being with 40.
Below, sheet adsorption device 30 is described in detail.
Fig. 4 is the exploded stereogram of sheet adsorption device 30.Recording medium S also together is shown among the figure.
Static pressure control part 60 be disposed at be with 40 and fan 50 between, control respectively attracts the attraction in hole 42.
Be with 40 can use resin film, but preferably have flexibility but the little film of retractility.
The rotating vane of fan 50 drives by motor, produces negative pressure.White arrow among Fig. 4 is represented discharge directions.Produce mechanism as negative pressure, except fan 50, use the piston-type negative pressure to produce mechanism and also can.
Static pressure control part 60 possesses: as the band gripper shoe 61 of first plate-shaped member, as the 3rd plate-shaped member valve plate 62, sept plate 63, as the main body 64 and the coffer 65 of second plate-shaped member.
Illustrated among Fig. 5 from sheet adsorption plane 41 sides observe with 40 and the stereogram of band gripper shoe 61.The throughput direction of representing recording medium S with white arrow.
On band gripper shoe 61,, be formed with a plurality of grooves 610 with staggered corresponding to the row in the attraction hole 42 of the throughput direction of recording medium S.Groove 610 slenderly forms on the throughput direction of recording medium S.The length of the throughput direction of the recording medium S of groove 610 forms two the interval degree that attract hole 42 lining up row at the throughput direction of recording medium S, with with in 40 move, under the situation that move in attraction hole 42, any one of attraction hole 42 is stuck on the groove 610.
Thereby,, also be stuck in any one of the groove 610 arranged on the throughput direction even be formed at 40 attraction hole 42 under with 40 situations about moving along throughput direction.
Be formed with in the bottom of groove 610 as one of the breakthrough part (hole) of the first static pressure unit 611.This breakthrough part can be for a plurality of, also can in the optional position that is positioned at the bottom of groove 610.
The band gripper shoe 61 preferred materials that are difficult to be out of shape that use.For example, can use metal, resin etc.
In Fig. 4, on valve plate 62,, be formed with a plurality of valves 620 corresponding to the position of the first static pressure unit 611.Fig. 6 represents the enlarged drawing of a valve 620.
Among Fig. 6, valve 620 possesses: barrier film 621, support portion 622, the first arm 623, and second arm 624.
Two the first arm 623 dual-grippers that barrier film 621 passes through to form in one direction are in annular support part 622.Support portion 622 by with the direction of the first arm 623 quadratures on two second arms 624 forming, in valve plate 62 dual-grippers in the matrix of the exterior lateral area that becomes valve 620.Like this, valve 620 has: make the different and support barrier film 621 of the distance from the center that is positioned at a pair of the first arm 623 that forms on the straight line and second arm 624, so-called universal joints structure that can displacement on the thickness direction of the first arm 623 and second arm 624.
Being shaped as of barrier film 621 is discoid, and through hole 625 is formed at the center.
Between the matrix of support portion 622 and valve plate 62, be formed with gap 626, between support portion 622 and barrier film 621, be formed with gap 627.
In Fig. 4, on sept plate 63,, be formed with a plurality of breakthrough parts 630 as valve cap corresponding to valve 620 as the 4th plate-shaped member.The size of the peristome of breakthrough part 630 is the size of valve 620 degree.
On main body 64,, be formed with a plurality of breakthrough parts (hole) as the second static pressure unit 640 corresponding to barrier film 621.Forming greatly of the peristome of the second static pressure unit 640 is littler than barrier film 621.
In addition, a plurality of second static pressure unit 640 are communicated with respectively by stream 641.
On coffer 65, the suction inlet 51 corresponding to fan 50 forms porose 650.The suction inlet 51 of fan 50 is communicated with stream 641 by hole 650.Thereby the second static pressure unit 640 is communicated with fan 50.
The part sectioned view of sheet adsorption device 30 has been shown among Fig. 7.
The center configuration of the center in the hole of the center in the hole of the first static pressure unit 611, the second static pressure unit 640 and valve 620 becomes to be positioned on the axle shown in the single-point line.The first static pressure unit 611 and the second static pressure unit 640 are communicated with and formation connection stream 600 via valve 620.Being communicated with stream 600 is represented by dotted arrow.
At this, constitute switching by the first static pressure unit 611, valve 620, breakthrough part 630 and the second static pressure unit 640 and be communicated with first state of stream 600 and the stream switching mechanism 70 of second state.
Below, describe the effect of the valve 620 in the stream switching mechanism 70 and first state and second state that is communicated with stream 600 in detail.
Near the stream switching mechanism 70 amplification profile has been shown among Fig. 8.The stream of the gas under the situation that arrow is represented to attract with fan 50 among the figure.
In valve 620, the gap 626 between support portion 622 and the valve plate 62, the gap 627 that reaches between support portion 622 and the barrier film 621 constitute the first stream portion, and through hole 625 constitutes the second stream portion.
Solid arrow represents that gas flows through the appearance of the second stream portion, and the double dot dash line arrow represents to flow through the appearance of the first stream portion.
In Fig. 7 and Fig. 8, when covering, few from the inflow of the gas that attracts hole 42 with 40 attraction hole 42 printing medium S.In addition, the first static pressure unit 611 and the second static pressure unit 640 are communicated with by through hole 625.In this case, because the pressure compensation that comes the inflow of the gas in self-gravitation hole 42 to produce is little, therefore, do not produce big difference between the pressure in the pressure in the first static pressure unit 611 and the second static pressure unit 640.Thereby the power that gas flow causes does not put on barrier film 621.
Gas flows through first stream portion (by the path in gap 626 and gap 627) and the second stream portion (by the path of through hole 625).This state is for being communicated with first state of stream 600.When printing medium S covered with 40 attraction hole 42, the pressure in the first static pressure unit 611 approached atmospheric pressure.On the other hand, the second static pressure unit, the 640 interior pressure that attract by fan 50 become negative pressure.Thereby gas flow is, with the direction pushing of barrier film 621 to the second static pressure unit 640.
Gas flows through the second stream portion.This state is for being communicated with second state of stream 600.
Second state is that the stream sectional area is littler than first state, is communicated with stream 600 not by the state of the second stream portion obturation.Thereby, attract hole 42 not have printing medium S to cover, when connection stream 600 is in second state, also from attracting hole 42 to attract a little.
If this state is to utilizing recording medium S to cover the state transitions that attracts hole 42, then owing to come the inflow of the gas in self-gravitation hole 42 to reduce, the pressure of the first static pressure unit 611 reduces, and barrier film 621 moves to by the position shown in the 622A.
At this, consider not have the situation of through hole 625 at barrier film 621.In this case, the attraction hole 42 not state of printing medium S covering is that barrier film 621 is positioned at position 621B, is communicated with stream 600 fully by the state of obturation.
In case obturation even then attract hole 42 printing medium S to cover afterwards, is not carried out the attraction in attraction hole 42 certainly fully yet, do not adsorb recording medium S as if under this state, being communicated with stream 600.That is, be atmospheric state in the first static pressure unit 611, the second static pressure unit 640 becomes negative pressure state by fan 50.
Like this, the structural reason that forming under second state does not entirely shut is communicated with stream 600 is by covering having or not of the recording medium S that attracts hole 42, changing the pressure of the first static pressure unit 611.
If form through hole 625, then the pressure in the first static pressure unit 611 attracts the having or not of recording medium S in hole 42 to change according to covering.
Also have, through hole 625 is arranged at band gripper shoe 61, valve plate 62, sept plate 63 and main body 64, the first static pressure unit 611 and the second static pressure unit 640 is communicated with also can.
At this, sept plate 63 is communicated with the stroke of stream 600 from the barrier film 621 of first state when second state transitions by its thickness regulation.Switch to second state reliably in order to be communicated with stream 600, importantly stipulate the trip well, therefore, shown in present embodiment, preferably use the structure of plate member for each barrier film 621 precision.
Also have, as with the different structure of structure of using sept plate 63, form in integratedly main body 64 also can, but compare with present embodiment, be difficult between each barrier film 621, stroke be stipulated equably.
Size, the capacity of the first static pressure unit 611, the size of breakthrough part 630 and the capacity of the second static pressure unit 640 etc. in the attraction of the size of through hole 625, fan 50, attraction hole 42 suitably are designed to, when printing medium S covers in attraction hole 42, overcome the spring force of the first arm 623 and second arm 624, stop up the peristome of the second static pressure unit 640.
If the size design of through hole 625 is got greatly, then attracting under the situation that printing medium S does not cover of hole 42 (being communicated with stream 600 is under the situation of second state), a large amount of gases are attracted from attracting hole 42 by through hole 625, and therefore, the loss (loss) of the negative pressure that is produced by fan 50 becomes big.On the contrary, if the size design of through hole 625 is got little, then the pressure corresponding to the first static pressure unit 611 that has or not that covers the recording medium S that attracts hole 42 changes spended time, therefore, reduces the response of barrier film 621.The size of through hole 625 is preferably suitably set in view of such situation.
In addition, the volume of the first static pressure unit 611 and groove 610 is more little, and corresponding to rapid more the causing of pressure variation of the first static pressure unit 611 that has or not that covers the recording medium S that attracts hole 42, therefore, the response of barrier film 621 improves.
As stream switching mechanism 70, except the mechanism that uses barrier film 621, also can be the situation that attracts hole 42 printing medium S to cover by perception such as sensors, and drive the mechanism of selecting by the little fan that attracts hole 42 each setting.In addition, also can attract the situation of hole 42 printing medium S covering, use the drive unit or the electromagnetism barrier film of shutter and shutter, select to attract hole 42 by perception such as sensors.
According to such present embodiment as can be known, has following effect.
(1) the stream sectional area of the connection stream 600 that is communicated with attraction hole 42 that printing medium S not covers is compared with the size of the stream sectional area of the connection stream 600 that is communicated in the attraction hole 42 that printing medium S covers and is diminished.That is, stream switching mechanism 70 attracts the having or not of recording medium S in hole 42 suitably to select the stream sectional area corresponding to covering.Therefore, can reduce the not gas flow at 42 places, attraction hole of printing medium S covering relatively.Thereby, size, the gradient of the recording medium S that no matter adsorbs, all obtain stable absorption affinity, the change of load that can access the mobile noise that causes of air and attraction is few, consumes sheet adsorption device 30, conveying device 20, image processing system 100 that electric power reduces.
(2) when attracting hole 42 printing medium S covers, the pressure that approaches in the second static pressure unit 640 that the pressure ratios in the atmospheric first static pressure unit 611 are attracted is big.At this moment, owing to partly open and close to be communicated with valve 620, the first static pressure unit 611 of stream 600 and the stream sectional area of the gas between the second static pressure unit 640 diminishes, therefore, can reduce from the gas flow that attracts hole 42 to flow into.Thereby, the main attraction hole 42 that attracts printing medium S to cover, size, the gradient of the recording medium S that no matter adsorbs, all obtain stable absorption affinity, the change of load that can access the mobile noise that causes of air and attraction is few, consumes sheet adsorption device 30, conveying device 20, image processing system 100 that electric power reduces.
Covering by recording medium S under the state that attracts hole 42, be communicated with stream 600 not by obturation.Therefore, according to having or not of the recording medium S that cover to attract hole 42, the pressure oscillation of the first static pressure unit 611 can suitably change the position of barrier film 621.
(3) valve 620 switchings are as the gap 626 and the gap 627 of the first stream portion, and therefore, connection stream 600 passes through to be communicated with as the through hole 625 of the part of the second stream portion.Under valve 620 closing state, also by through hole 625, thereby the pressure that can easily be communicated with the place, valve 620 both sides in the stream 600 is regulated.
(4) therefore valve 620, constitutes stream switching mechanism 70 by simple structure by the connection stream 600 of the partly open first static pressure unit 611 of barrier film 621 and the second static pressure unit 640.Thereby it is small-sized, slim that stream switching mechanism 70 becomes, and can access small-sized, slim sheet adsorption device 30, conveying device 20, image processing system 100.
(5) stream switching mechanism 70 is made of the stacked simple structure that is formed with band gripper shoe 61, valve plate 62, the sept plate 63 of the first static pressure unit 611 and is formed with the main body 64 of the second static pressure unit 640, therefore, and need be from the electric power of outside.Thereby can be reduced consumes sheet adsorption device 30, conveying device 20, the image processing system 100 of electric power.In addition, stream switching mechanism 70 is made of stepped construction, therefore, can make stream switching mechanism 70 small-sized, slim, can access small-sized, slim sheet adsorption device 30, conveying device 20, image processing system 100.
(6) valve 620 has so-called universal joints structure, and therefore, barrier film 621 when mobile, can reduce the degree that barrier film 621 tilts with respect to gas flow in the breakthrough part 630 as valve cap.Thereby repeatability by barrier film 621 control gas flow, can access sheet adsorption device 30, conveying device 20, the image processing system 100 that can select reliably by the attraction hole 42 of recording medium S covering well.
(7) stackedly be formed with the sept plate 63 of breakthrough part 630 and form, therefore, compare, can improve the precision of shape, can also reduce cost with the situation that valve cap is formed as base material processing.
(8) the attraction hole 42 that covers by printing medium S not suppresses to attract, and therefore, can suppress the flowing of air of the outer rim vicinity of recording medium S, the image processing system 100 of the flight bending of the black liquid 11 that sprays from jet head liquid 10 of can being inhibited.
(9) when covering by recording medium S, become negative pressure in the first static pressure unit 611 and the second static pressure unit 640 and get final product, therefore, not only can actual air volume type fan, but also can use the piston-type pump.
(10), can determine the position that stops and the response of barrier film 621 by the size that changes through hole 625, the width of support portion 622, the size in gap 626,627.
(11) when the driving of fan 50, suppress on the other hand, to give big attraction to the attraction hole 42 that printing medium S covers from the not attraction in the attraction hole 42 of printing medium S covering with 40.Therefore, when being with 40 to carry, under fan 50 and situation that a plurality of attractions hole 42 is communicated with, also can on throughput direction, give suitable absorption affinity in front end and the rear end to recording medium S at mounting recording medium S.That is, can be to mounting in the recording medium S that carries with 40, suitably give absorption affinity to the front end of its throughput direction integral body till the rear end, recording medium S stably can be supported in 40 lip-deeply carry simultaneously.In addition, under the situation about using with the size of the width of throughput direction quadrature and other recording mediums S recording medium S inequality or under the situation of the recording medium S that changes halfway of the width of use a slice recording medium S, also according to the having or not of recording medium S that attracts on the hole 42, change the sectional area that is communicated with stream, therefore, give big attraction by the attraction hole 42 that only printing medium S is covered, can under absorption comprises whole the state of end of recording medium S, stably carry.
(second embodiment)
The summary section of the image processing system 200 of present embodiment has been shown among Fig. 9.The image processing system 200 of present embodiment is continuously in printing as the recording medium S of roller paper.The point inequality with first embodiment is to be with 40 not to be contained in this point in the conveying device 85.
In Fig. 9, conveying device 85 possesses: feeding-in roll 71, paper takers-in 72 and sheet adsorption device 80.
When recording medium S is adsorbed in sheet adsorption plane 612, be transferred to paper takers-in 72 from feeding-in roll 71.Sheet adsorption device 80 possesses: as the fan 50 and the static pressure control part 60 that attract mechanism.
In the sheet adsorption device 80 of present embodiment, sheet adsorption plane 612 becomes Fig. 5, the Fig. 7 of first embodiment and the face that is provided with groove 610 of band gripper shoe 61 shown in Figure 8.Thereby recording medium S directly is adsorbed in the face that is provided with groove 610.
In addition, in the present embodiment, replace Fig. 5, shown in Figure 7 with the 40 attraction holes 42 that form at first embodiment, as the hole of the first static pressure unit 611 also as attracting hole 613 to play a role.
In the present embodiment, Fig. 5, Fig. 7 are not set and groove 610 shown in Figure 8 also can.In this case, recording medium S covers and attracts hole 613.
According to such embodiment as can be known, has following effect.
(12) in the large-scale image processing system 200 that uses roller paper, also can access the effect identical with first embodiment.
Also have, be not limited to above-mentioned embodiment, can in the scope that does not break away from its aim, carry out above-mentioned various changes in addition.
(the 3rd embodiment)
The summary section of the sheet adsorption device 66 that the image processing system of present embodiment has has been shown among Figure 10.Among the figure, the stream of the gas under the situation that arrow is represented to attract with fan 50.In addition, white arrow is represented the throughput direction of recording medium S.Also have, in the present embodiment, the structure beyond the sheet adsorption device 66 is identical with first embodiment.Specifically, be disposed in the sheet adsorption device 66 with 40 and fan 50 between static pressure control part 67 control respectively attract the attraction state in hole 42, therefore, switch first state and second state that are communicated with stream 600.
As shown in figure 10, sheet adsorption device 66 possesses: as the band gripper shoe 68 of first plate-shaped member, it can be via supporting the recording medium S of mountings on 40 with 40; Main body 69 as second plate-shaped member; Coffer 65.Also have, be with gripper shoe 68, main body 69, reach coffer 65 stacking gradually from the top with fan 50 sides of 40 sides towards the below.
With the band gripper shoe 61 of first embodiment in the same manner, at the upper surface of band gripper shoe 68,, staggeredly be formed with a plurality of grooves 681 corresponding to the row in the attraction hole 42 of the throughput direction of recording medium S.Groove 681 slenderly forms on the throughput direction of recording medium S.The length of the throughput direction of the recording medium S of groove 681 forms two the interval degree that attract hole 42 lining up row at the throughput direction of recording medium S, with with in 40 move, under the situation that move in attraction hole 42, any one of attraction hole 42 is stuck on the groove 681.
Also have, the bottom notch of the groove 681 in this band gripper shoe 68 is provided with the roughly cylindric first static pressure unit 682, and, be formed with the through hole 683 that connects the lower surface of being with gripper shoe 68 in the bottom of this first static pressure unit 682.Also have, the opening edge part chamfering of the upside that becomes the first static pressure unit, 682 sides of this through hole 683 forms the valve seat with conical surface-shaped bearing surface 684 685 of upside hole enlargement thus.
In addition, the lower surface of band gripper shoe 68 be formed with near the position through hole 683 with the axis of through hole 683 abreast towards above to extend the back crooked and to the intercommunicating pore 686 as interconnecting part of the medial surface opening of the first static pressure unit 682 to horizontal direction.Also have, the diameter of this intercommunicating pore 686 forms less than the through hole 683 (that is, the stream sectional area is little) that partly is formed with valve seat 685 at the upside opening edge.Also have, in the present embodiment, utilize the through hole 683 in big footpath to constitute the first stream portion that is communicated with stream 600, and, utilize the intercommunicating pore 686 of path to constitute the second stream portion that is communicated with stream 600.
In addition, be provided with the roughly cylindric second static pressure unit 691 in the upper surface of main body 69 depression, this second static pressure unit 691 is being stuck on the throughput direction of recording medium S on two the first static pressure unit 682.Also have, these two first static pressure unit 682 are communicated with in the through hole 683 of each the first static pressure unit, 682 inner opening and intercommunicating pore 686 and the second static pressure unit 691 via an end.Also have, the volume of the second static pressure unit 691 forms greater than the first static pressure unit 682, is formed with the through hole 692 to the lower surface perforation of main body 69 in its bottom.Be formed with a plurality of second such static pressure unit 691 in main body 69, each second static pressure unit 691 is interconnected via the stream 693 that is communicated with separately through hole 692.
In addition, coffer 65 is structures identical with the coffer 65 of first embodiment, forms porose 650 corresponding to the suction inlet 51 of fan 50.Also have, suction inlet 51 is communicated with the stream 693 of main body 69 by this hole 650, and fan 50 is communicated with each second static pressure unit 691 thus.
And then, in the second static pressure unit 691 in main body 69, form gripper shoe 695, with opposed with the through hole 683 of each first static pressure unit 682 of upside with supported hole 694 with main body 69.In this supported hole 694, can insert the logical lower end side that constitutes the cylindric rod unit 761 of valve 76 slidingly and movingly.The upper end of this rod unit 761 is positioned at the first static pressure unit 682, forms the roughly circular cone trapezoidal shape valve body 762 that can contact with 684 of the bearing surfaces of valve seat 685 in the upper end of this rod unit 761.Also have the bearing surface that is conical surface-shaped 763 in this valve body 762 and bearing surface 684 butts of valve seat 685, the inaccessible first stream portion that is communicated with stream 600.
In addition, insert the spring 764 that is equipped with as force application part between gripper shoe 695 and valve body 762, valve 76 is by the power of granting of this spring 764, with the direction application of force of valve body 762 to the stream sectional area that increases connection stream 600.That is, valve 76 form often valve body 762 from valve seat 685 away from the valve state of opening (the first valve state).At this, the power of granting of spring 764 is the power that becomes the first static pressure unit 682 of atmospheric pressure state less than printing medium S not covers and utilize the pressure reduction of the second static pressure unit 691 that fan 50 attracts, and when the pressure in the first static pressure unit 682 and the second static pressure unit 691 is identical, become can make valve body 762 from valve seat 685 away from size.Also have, in the present embodiment,, constitute and switch first state that is communicated with stream 600 and the stream switching mechanism 70 of second state by the first static pressure unit 682, the second static pressure unit 691, valve 76, and valve seat 685.
Below, describe the effect of the valve 76 in the stream switching mechanism 70 and first state and second state that is communicated with stream 600 in detail.
Also have, shown in Figure 10 about two valves 76 usually the power of granting by spring 764 to valve body 762 from valve seat 685 away from direction by the application of force, form the valve state of having opened as the through hole 683 of the first stream portion of opening (the first valve state).Also have, if under this state drive fan 50, then the pressure in the second static pressure unit 691 is because the attraction of fan 50 becomes negative pressure, becomes above the power of granting of spring 764 with the pressure reduction of the interior pressure in the atmospheric first static pressure unit 682 roughly.Like this, valve 76 becomes its valve body 762 and overcomes the granting power of spring 764 and move towards the direction that falls to being positioned at valve seat 685, locking is communicated with stream 600 and forms second state as the valve state that closes (the second valve state) (with reference to the valve 76 in the left side among Figure 10) of the through hole 683 of the first stream portion.
Secondly, under this state, the attraction hole 42 that covers with printing medium S in the attraction hole 42 in 40 that suppresses mounting recording medium S and carry is followed with 40 move and become under the location status corresponding with the first static pressure unit 682, and gas flows into situation in the first static pressure unit 682 from the outside via described attraction hole 42.Also have, gas flows in the second static pressure unit 691 on a small quantity via the intercommunicating pore 686 as the second stream portion in the first static pressure unit 682, and the pressure reduction of the first static pressure unit 682 and the second static pressure unit 691 diminishes gradually, becomes at last less than the power of granting of spring 764.Like this, valve 76 become the grant power of its valve body 762 by spring 764 towards from valve seat 685 away from direction move, opened the valve state of opening (the first valve state) (with reference to the valve 76 on the right side among Figure 10) as the through hole 683 of the first stream portion, will be communicated with stream 600 from second state to first state transitions.
Also have, under this state, mounting recording medium S and carry with in the attraction hole 42 in 40 not the attraction hole 42 that covers of printing medium S follow with 40 move and become under the location status corresponding with the first static pressure unit 682, gas flows into situation in the first static pressure unit 682 from the outside via described attraction hole 42.Like this, the pressure in the first static pressure unit 682 become and approach atmospheric pressure, surpass the power of granting of spring 764 with the pressure reduction of pressure in the second static pressure unit 691 that becomes negative pressure.Like this, valve 76 becomes its valve body 762 and overcomes the granting power of spring 764 and move towards the direction that falls to being positioned at valve seat 685, locking as the valve state that closes (the second valve state) (with reference to the valve 76 in the left side among Figure 10) of the through hole 683 of the first stream portion, will be communicated with stream 600 from first state to second state transitions.
According to such embodiment as can be known, has following effect.
(13) not according to barrier film, and possess form can with respect to valve seat 685 fall the position valve body 762 and be set to valve body 762 often to from valve seat 685 away from the direction application of force spring 764 and constitute under the situation of valve 76, also can access and first embodiment and the identical effect of second embodiment.Therefore, constitute stream switching mechanism 70 by simple structure.
(14) and then, the second static pressure unit 691 that becomes negative pressure chamber when attracting drive fan 50 is not the stacked valve plate that is made of spring steel and the main body 69 that is made of the material beyond the spring steel and the airtight structure that forms.Therefore, for example, (for example possessing heating arrangements for the drying of the black liquid that promotes recording medium S is sprayed, heater or warm wind device) situation under, also different with thermal coefficient of expansion and main body 69 valve plates is different with the situation that the mode of the airtight formation second static pressure unit 691 is laminated in main body 69, does not cause the distortion that causes by the heat conduction.Thereby, can enlarge band gripper shoe 68 that constitutes static pressure control part 67 or the selection width that forms the parts of main body 69.
Each volume of (15) the first static pressure unit 682 and the second static pressure unit 691 forms as follows, that is: follow the driving of fan 50 and become earlier negative pressure conduct first negative pressure chamber the second static pressure unit 691 volume greater than after become the volume of the first static pressure unit 682 of conduct second negative pressure chamber of negative pressure.Thus, during to first state transitions, can give big attraction from second state being communicated with stream 600 to recording medium S.The front end that therefore, can on throughput direction, suitably adsorb recording medium S.
(variation 1)
Near the stream switching mechanism 73 in the variation 1 amplification profile has been shown among Figure 11.
Structure beyond the stream switching mechanism 73 is identical with first embodiment.Specifically, replace barrier film 621, use movable part 700 and spring 730, switch first state and second state of connection stream 600 shown in Figure 7.
In Figure 11, stream switching mechanism 73 possesses: the first static pressure unit 611, movable part 700, spring 730, breakthrough part 630, the second static pressure unit 640 and be communicated with the first static pressure unit 611 and the through hole 740 of the breakthrough part 630 and the second static pressure unit 640.
Below, describe in detail the movable part 700 in the stream switching mechanism 73 effect, and be communicated with first state and second state of stream 600.
The stream of the gas under the situation that arrow is represented to attract with fan 50 among Figure 11.
In Figure 11, gap 703 constitutes the first stream portion, and through hole 740 constitutes the second stream portion.
Solid arrow represents that gas flows through the appearance of the second stream portion, and two dash-dot arrows represent to flow through the appearance of the first stream portion.
In Figure 11, when covering, few from the inflow of the gas that attracts hole 42 with 40 attraction hole 42 printing medium S.In addition, by through hole 740 and gap 703, be communicated with the first static pressure unit 611 and the second static pressure unit 640.In this case, the pressure compensation that comes the inflow of the gas in self-gravitation hole 42 to produce is little, therefore, does not produce big difference between the pressure in the pressure in the first static pressure unit 611 and the second static pressure unit 640.Thereby the power that gas flow causes does not act on movable part 700.
Gas flows through the first stream portion and the second stream portion.This state is for being communicated with first state of stream 600.
When printing medium S covered with 40 attraction hole 42, the pressure in the first static pressure unit 611 approached atmospheric pressure.On the other hand, the second static pressure unit, the 640 interior pressure that utilize fan 50 to attract become negative pressure.Thereby gas flow is, with the direction pushing to the second static pressure unit 640 of the dividing plate 701 of movable part 700.
Gas flows through the second stream portion.This state is for being communicated with second state of stream 600.
(variation 2)
Figure 12 shows near the amplification profile the stream switching mechanism 74 in the variation 2.Specifically, the shape difference of barrier film 750.
Structure beyond the stream switching mechanism 74 is identical with first embodiment.
In Figure 12, barrier film 750 has the hemispherical Shell shape, utilizes arm 751 to be fixed in valve plate 75 by cantilever support.Be formed with through hole 752 at barrier film 750.
Below, describe effect, and first state and second state of connection stream 600 shown in Figure 7 of the barrier film 750 in the stream switching mechanism 74 in detail.
The stream of the gas under the situation that arrow is represented to attract with fan 50 among Figure 12.
In Figure 12, the gap 753 of a side that does not have cantilever support of the barrier film 750 of cantilever support constitutes the first stream portion, and through hole 752 constitutes the second stream portion.
Solid arrow represents that gas flows through the appearance of the second stream portion, and two dash-dot arrows represent to flow through the appearance of the first stream portion.
In Figure 12, when covering, few from the inflow of the gas that attracts hole 42 with 40 attraction hole 42 printing medium S.In addition, by through hole 752 and 753, the first static pressure unit 611, gap and 640 connections of the second static pressure unit.In this case, the pressure compensation that comes the inflow of the gas in self-gravitation hole 42 to produce is little, therefore, does not produce big difference between the pressure in the pressure in the first static pressure unit 611 and the second static pressure unit 640.Thereby the power that gas flow causes does not act on barrier film 750.
Barrier film 750 stop at the attraction of fan 50 and act on the power of barrier film 750 and restoring force balance that the spring force of arm 751 causes by the position 750A shown in two chain-dotted lines.
Gas flows through the first stream portion and the second stream portion.This state is for being communicated with first state of stream 600.
According to the size in through hole 752 and gap 753, determine these stop position.
When printing medium S covered with 40 attraction hole 42, the pressure in the first static pressure unit 611 approached atmospheric pressure.On the other hand, become negative pressure in the second static pressure unit 640 that utilizes fan 50 to attract.Thereby gas flow is that barrier film 750 is pushed to the second static pressure unit, 640 directions.
Barrier film 750 overcomes the spring force of arm 751 and moves in breakthrough part 630, at the peristome that is stopped up the second static pressure unit 640 by the position 750B shown in two chain-dotted lines.
Gas flows through the second stream portion.This state is for being communicated with second state of stream 600.
By with the protuberance 756 of the valve plate 75 of barrier film 750 opposed positions, can determine the width in gap 753.This protuberance 756 can not have yet.
(variation 3)
The stereogram of the valve body 810 in the variation 3 has been shown in Figure 13 (a) and (b).
Structure beyond the valve body 810 is identical with the 3rd embodiment.Specifically, by being formed at recessed 812 of conical surface-shaped bearing surface 811 in the valve body 810 when being formed on bearing surface 684 butts of the bearing surface 811 of valve body 810 and valve seat 685, be communicated with the interconnecting part of the conduct second stream portion of the first static pressure unit 682 and the second static pressure unit 691.
Therefore, valve body 810 from valve seat 685 away from first state of connection stream 600 under, with the situation of the 3rd embodiment in the same manner, the gap of valve body 810 and valve seat 685 and the through hole 683 road portion that gains the first rank, S gives attraction to recording medium.On the other hand, fall to being positioned at valve body 810 under second state of connection stream 600 of valve seat 685, the bearing surface 811 of valve body 810 and bearing surface 684 butts of valve seat 685, the gap of the bearing surface 684 by recessed 812 and valve seat 685 forms the second stream portion.
According to this as can be known, can not form under the situation of intercommunicating pore 686, form the second stream portion with simple structure in main body 69.And then, utilize two recessed 812 and form two second stream portions, therefore, even cause under the situation of one recessed 812 obstruction, also can transmit negative pressure by other one recessed 812 the first static pressure unit 682 to first state at black liquid owing to paper powder or drying.
(variation 4)
The stereogram of the valve body 820 in the variation 4 has been shown in Figure 14 (a) and (b).
Structure beyond the valve body 820 is identical with the 3rd embodiment.Specifically, form through hole 821 at the central portion of valve body 820 along axis direction, be communicated with the interconnecting part of the conduct second stream portion of the first static pressure unit 682 and the second static pressure unit 691 when being formed on bearing surface 684 butts of the bearing surface 822 of valve body 820 and valve seat 685.
Therefore, valve body 820 from valve seat 685 away from first state of connection stream 600 under, with the 3rd embodiment in the same manner, the gap of valve body 820 and valve seat 685 and the through hole 683 road portion that gains the first rank, S gives attraction to recording medium.On the other hand, fall to being positioned at valve body 820 under second state of connection stream 600 of valve seat 685, utilize the through hole 821 that is formed at valve body 820 to form the second stream portion.
According to this as can be known, the through hole 821 by the central portion at valve body 820 forms can form the second stream portion with simple structure.
(variation 5)
The stereogram of the valve body 830 in the variation 5 has been shown in Figure 15 (a) and (b).
Structure beyond the valve body 830 is identical with the 3rd embodiment.Specifically, replace intercommunicating pore 686, a plurality of protuberances 832 of whole formation at the bearing surface 831 of valve body 830 are formed on the interconnecting part that is communicated with the conduct second stream portion of the first static pressure unit 682 and the second static pressure unit 691 when valve seat 685 falls to being positioned at valve seat 685.
Therefore, valve body 830 from valve seat 685 away from first state of connection stream 600 under, with the 3rd embodiment in the same manner, the gap of valve body 830 and valve seat 685 and the through hole 683 road portion that gains the first rank, S gives attraction to recording medium.On the other hand, fall to being positioned at valve body 830 under second state of connection stream 600 of valve seat 685, the protuberance 832 of valve body 830 and bearing surface 684 butts of valve seat 685, the gap of the bearing surface 831 by valve body 830 and the bearing surface 684 of valve seat 685 forms the second stream portion.
According to this as can be known, by a plurality of protuberances 832, between the bearing surface 684 of the bearing surface 831 of valve body 830 and valve seat 685, form a plurality of second stream portions.Thereby, even under the situation that the black liquid owing to paper powder or drying causes stopping up between the adjacent protuberance 832, also guarantee the second stream portion each other by other a plurality of protuberances 832.
Except variation, also can carry out various changes.
For example, replace being provided as the sept plate 63 of the 4th plate-shaped member, form valve cap in main body 64 and also can as second plate-shaped member.
In addition, attract quantity, shape, size, configuration, the shape of groove 610, size, the configuration in the hole in hole 42,613 suitably to select according to the recording medium S that handles.
In addition, the material of valve 620 and barrier film 621, the size of through hole 625 that is formed at barrier film 621 and the shape of shape, support portion 622 and arm 623,624 etc. can be so that the peristome of the second static pressure unit 640 is stopped up the situation whether barrier film 621 can be capped according to recording medium S or open mode be selected.
Specifically, according to attraction and the shape in attraction hole 42 and shape and size, the shape of breakthrough part 630 and the shape and the size of size, the second static pressure unit 640 and static pressure unit 642 in size, the first static pressure unit 611 and attraction hole 613 of fan 50, the suitable size of selector valve 620 and barrier film 621 etc., shape, material etc.
In addition, can form protuberance and recesses at the fall valve seat 685 of position of valve body, also can both form protuberance and recess at valve body and valve seat 685.At this moment, a side recess does not need that both open to the first static pressure unit 682 and the second static pressure unit 691, forms the structure of utilizing both recess that is formed at valve body and valve seat 685 to be communicated with the first static pressure unit 682 and the second static pressure unit 691 and gets final product.
In addition, pass through by making gas, and big material (for example, the porous parts of sintered body and so on) the formation valve body of flow path resistance, will also can as the second stream portion by the stream of the gas in the valve body.
In addition, in the respective embodiments described above, be applicable to that coloured image forms device, but applicable object is not limited to this, the black white image that also goes for so-called formation monochrome image forms device.
And then sheet adsorption device 30,80 in the respective embodiments described above and conveying device 20,85 are not to be only applicable to image processing system 100,200.For example, go for the fixing usefulness of sheet in X-Y logger, announcement usefulness panel, the wall of dwelling house, the instrument board of car etc., the conveying of the substrate in the manufacturing process.
Claims (12)
1. sheet adsorption device is characterized in that possessing:
The sheet adsorption plane;
Attract the hole, it is arranged at described adsorption plane;
The stream switching mechanism, it has or not according to the sheet that covers described attraction hole, switches first state and second state of the connection stream that is communicated with described attraction hole,
Described second state is that the stream sectional area is littler than described first state, and the state of not inaccessible described connection stream.
2. sheet adsorption device according to claim 1 is characterized in that,
Described stream switching mechanism possesses:
The first static pressure unit, it is communicated with described attraction hole;
The second static pressure unit, it is communicated with the described first static pressure unit;
Valve, it is according to the pressure reduction of described first static pressure unit and the described second static pressure unit, partly opens and closes the described stream that is communicated with between the described first static pressure unit and the described second static pressure unit.
3. sheet adsorption device according to claim 2 is characterized in that,
Described connection stream has: the first stream portion and the second stream portion,
Described valve opens and closes described first-class road portion.
4. according to claim 2 or 3 described sheet adsorption devices, it is characterized in that,
Described valve has: the barrier film that is provided with between described first static pressure unit and the described second static pressure unit.
5. sheet adsorption device according to claim 4 is characterized in that,
Described stream switching mechanism possesses:
First plate-shaped member, it is formed with the breakthrough part that constitutes the described first static pressure unit;
Second plate-shaped member, it is formed with the breakthrough part that constitutes the described second static pressure unit;
The 3rd plate-shaped member, it is disposed between described first plate-shaped member and described second plate-shaped member, and is formed with described barrier film.
6. sheet adsorption device according to claim 5 is characterized in that,
Described barrier film by at least one direction by the support portion of dual-gripper, with a described at least direction roughly on the direction of quadrature by the matrix of dual-gripper in described the 3rd plate-shaped member.
7. according to each described sheet adsorption device in the claim 4～6, it is characterized in that,
Described barrier film has through hole, and this through hole is used for making under described second state described first static pressure unit and the described second static pressure unit to connect.
8. according to each described sheet adsorption device in the claim 4～7, it is characterized in that,
Described stream switching mechanism possesses: first plate-shaped member, and it is formed with the breakthrough part that constitutes the described first static pressure unit;
Second plate-shaped member, it is formed with the breakthrough part that constitutes the described second static pressure unit;
The 3rd plate-shaped member, it is disposed between described first plate-shaped member and described second plate-shaped member, and is formed with described barrier film;
The 4th plate-shaped member, it is clamped between described second plate-shaped member and described the 3rd plate-shaped member, and the 4th plate-shaped member is formed with the breakthrough part of the valve cap that constitutes described valve.
9. according to claim 2 or 3 described sheet adsorption devices, it is characterized in that,
Described valve has: the valve body that between described first static pressure unit and the described second static pressure unit, can dispose to displacement,
The grant power of this valve body by force application part usually with described connection stream to the direction application of force that is in described first state, and, under the situation of pressure reduction above the power of granting of described force application part of described first static pressure unit and the described second static pressure unit, overcome this and grant power, make described connection stream to the direction displacement that is in described second state.
10. sheet adsorption device according to claim 9 is characterized in that,
Described valve has valve seat, and this valve seat makes the power of granting that overcomes described force application part, and with the described valve body that described connection stream has carried out displacement to the direction that is in described second state position that falls,
At least one side in described valve body and described valve seat is provided with interconnecting part, and this interconnecting part is used for making under described second state described first static pressure unit and the described second static pressure unit to be communicated with.
11. a conveying device, it is adsorbed in the sheet adsorption plane with sheet and carries, and it is characterized in that possessing:
The travel mechanism of described adsorption plane;
Sheet adsorption device in claim 1～claim 10 described in each.
12. an image processing system, it forms image on sheet, it is characterized in that, possesses:
Each described sheet adsorption device or the described conveying device of claim 11 in claim 1～claim 10.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-205039 | 2007-08-07 | ||
| JP2007205039 | 2007-08-07 | ||
| JP2007205039 | 2007-08-07 | ||
| JP2008-132801 | 2008-05-21 | ||
| JP2008132801 | 2008-05-21 | ||
| JP2008132801A JP2009057207A (en) | 2007-08-07 | 2008-05-21 | Sheet suction device, carrying device, and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101386236A true CN101386236A (en) | 2009-03-18 |
| CN101386236B CN101386236B (en) | 2011-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101296962A Active CN101386236B (en) | 2007-08-07 | 2008-08-07 | Sheet adsorption device, transport device, and image forming apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2009057207A (en) |
| CN (1) | CN101386236B (en) |
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