JP2000198576A - Sheet feeder and recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ink stains and roulette-like scores both posed by feed- system parts such as spurs adapted to come into contact with the recording surface of recording paper. SOLUTION: The sheet feeder includes a fixed shank portion 13 with a plurality of branch suction pipes 10 branching from a main suction pipe 5 laid along a shaft and extending to the shank periphery or a sheet feed path, a suction roller 8 with a rotary portion 14 provided with a plurality of holes and rotated about the fixed shank portion 13, and a pump for aspirating air from the branch suction pipes 10 in the fixed shank portion 13 via the holes of the rotary portion 14 of the suction roller 8. Sheets 1 are sucked against those portions of the fixed shank portion 13 which open to the branch suction pipes 10 or against suction holes of the fixed shank portion 13 via the holes cut in the rotary portion 14 of the suction roller 8, and are fed forwards when the rotary portion 14 is rotated to change its sheet sucking hole one from the next.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus for conveying a sheet, and more particularly to a sheet conveying apparatus used for an ink jet type recording apparatus.

[0002]

2. Description of the Related Art Conventionally, a printer adopting an ink jet system uses a quick-drying ink in order to perform recording by discharging ink droplets corresponding to image data on the surface of recording paper. However, since the ink ejected on the surface of the recording paper is not easily dried instantaneously, in the case of a method in which the recording paper is nipped and conveyed by rollers or the like, the recording surface side (the front side) of the recording paper
There is a possibility that ink adheres to the roller in contact with the recording medium and soils the subsequent recording surface. In order to avoid this, a transfer system as shown in FIG. 17 has been proposed.

FIG. 17 is a sectional view showing a schematic configuration of an ink jet printer. 17, reference numeral 102 denotes a mounting table on which a plurality of recording papers 101 can be mounted, and 103 denotes a mounting table 102.
A pick-up roller 104 for feeding one sheet of the recording paper 101 above, a feed roller 104 for conveying only one sheet in conjunction with a retard roller 105 when a plurality of sheets of paper are fed by the pick-up roller 103, and 105 Retard rollers 106 and 107, which act in conjunction with the feed roller 104 to return excess recording paper by applying a torque opposite to the transport direction in order to eliminate double feeding, the transport rollers 106 and 107 are transported by the feed roller 104 and the retard roller 105. A paper feed roller for conveying one sheet of recording paper to the recording section, 108 is a recording head that discharges ink on recording paper 101 according to image data to perform recording, and 109 is a recording paper at a position facing recording head 108. Ten
1 from the non-recording side, and the recording head 108 and recording paper 10
Head cradle that maintains a constant clearance with 1, 11
Numeral 0 denotes a guide pipe for sliding the recording head for smoothly moving the recording head 108 right and left (in the width direction intersecting with the recording paper conveying direction).

Further, reference numeral 111 denotes a spur configured to press the recording paper from the recording surface side to reduce the contact area with the recording paper, and 112 denotes a spur arranged on the non-recording surface side of the recording paper.
Receiving roller for conveying the recording paper held by
Reference numeral 3 denotes a tension roller that transmits power to the receiving roller 112 and plays a role of adjusting the tension when sandwiching the recording paper.

In FIG. 1, the tip of a spur 111 is used to minimize the contact area of the recording paper with the recording surface, and the spur 111 is brought into pin-point contact with the recording surface of the recording paper (point contact). The recording paper on which recording has been performed is conveyed while preventing ink from adhering to the spur 111 as much as possible.

[0006]

However, in the above-mentioned conventional example, even if the spur 111 arranged on the recording surface side of the recording paper is in pinpoint, the spur 111 comes into contact (point contact) with the recording surface of the recording paper. Therefore, the ink may adhere to the spur 111 to some extent depending on the recording position and the drying condition of the ink, and the subsequent recording surface may be soiled.

Further, in order to obtain a sufficient pressure while extremely reducing the contact area of the spur 111 with the recording paper,
The weight per unit area of the spur 111 on the recording paper increases, and a considerable weight is applied to the contact portion. For example, in the case of a paper having a soft print surface, there is a possibility that the mark of the spur 111 may be perforated. Was.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to prevent ink stains from being caused by transporting parts such as spurs in contact with the recording surface of a recording sheet, and to prevent perforations such as perforations.

[0009]

In order to achieve the above object, a typical configuration of the present invention is a plurality of intake branches which branch from an intake main pipe arranged in parallel with a shaft and reach the outer periphery toward a sheet conveying path. A fixed shaft portion provided with a pipe, a conveying means provided with a plurality of holes, and a rotating portion rotating around the fixed shaft portion around the fixed shaft portion, and fixed through a hole provided in a rotating portion of the conveying means A suction means for sucking air from an intake branch pipe provided on the shaft part, and a sheet facing a suction branch pipe provided on the fixed shaft part through a hole provided on a rotating part of the transport means. And transporting the sheet while switching the holes by rotating the rotating unit.

According to the above construction, for example, the non-recording surface side of the sheet on which recording has been performed is attracted to the portion facing the intake branch pipe provided on the fixed shaft portion via the hole provided in the rotating portion of the conveying means. It is possible to convey the sheet while switching the holes by rotating the rotating unit,
A transport system part such as a spur that comes into contact with the recording surface of the sheet is not required, so that the recording surface can be prevented from being stained with ink by the transport system part that comes into contact with the recording surface of the sheet, and a perforated mark is formed. Can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a recording apparatus having a sheet conveying apparatus to which the present invention is applied will be specifically described with reference to the drawings.

[First Embodiment] A recording apparatus provided with a sheet conveying apparatus according to a first embodiment will be described in detail with reference to FIGS. In the following description, a sheet conveying device used in an ink jet printer as a recording device is exemplified.

In FIG. 1, reference numeral 1 denotes a sheet to be recorded;
Is an arrow indicating the direction in which the sheet 1 is conveyed. Reference numeral 3 denotes a recording head serving as recording means, which discharges ink onto the sheet 1 in accordance with image data. Reference numeral 4 denotes a head support, which is a sheet 1 at a position facing the recording head 3.
Are supported from the non-recording surface side, and the clearance between the recording head 3 and the sheet 1 is kept constant. 5 is an intake main pipe for taking in intake air from the intake hole 10a, 6 is intake for sucking a sheet, and 7 is a suction force representing the vector and magnitude acting on the sheet 1 by the intake 6.
Reference numeral 8 denotes a suction roller as a conveying means, and a fixed shaft portion 13 provided with a plurality of intake branch pipes 10 branching from an intake main pipe 5 arranged in parallel to the shaft and reaching the outer periphery toward a sheet transport path; The rotary unit 14 is provided with a hole 14a for rotating the outer periphery of the fixed shaft 13 around the fixed shaft 13. Reference numeral 9 denotes an arrow indicating the rotation direction of the rotating portion 14 of the suction roller 8, and reference numeral 10 denotes an intake branch pipe branched from the intake main pipe 5 and connected to the intake hole 10a.

Then, the sheet 1 is placed on the suction roller 8 from the surface (non-recording surface) opposite to the surface facing the recording head 3.
At this time, it is adsorbed on the portion facing the intake branch pipe 10 provided on the fixed shaft portion 13 via the hole 14a provided on the rotating portion 14, and the rotating portion 14 is rotated to convey while switching the hole 14a. ing.

That is, from the main intake pipe 5 to the intake branch pipe
The suction force 7 acts on the sheet 1 from the recording surface by the suction air 6 sucked through the sheet 10, the sheet 1 is attracted to the suction roller 8 from the non-recording surface side, and the rotating unit 14 is further rotated in the direction of arrow 9 By switching the holes 14a, the sheet is conveyed in the direction of arrow 2.

FIG. 2 shows the above-described series of operations in chronological order in detail. In FIG. 2, reference numeral 11 denotes an induced suction force generated by induced suction used for the purpose of drawing the sheet 1 to the suction roller 8 in advance, and the magnitude of the force is smaller than the suction force 7. 12 is a rotating part 14 (a hole 14a) and an intake branch pipe 10
(Intake hole 10a), and the induced suction force is generated by a small gap, and the size of the gap limits the induced suction force 11. Reference numeral 13 denotes a fixed shaft portion of the suction roller 8, which is provided with a plurality of intake branch pipes 10 branching from the intake main pipe 5 arranged in parallel with the shaft and reaching the outer periphery in the sheet conveying direction as described above. Reference numeral 14 denotes a rotating portion of the suction roller 8 disposed outside the fixed shaft portion 13. As described above, a plurality of holes 14a for sucking the sheet 1 are provided on the surface, and the fixed shaft portion Rotate its outer circumference around 13.

FIG. 2 (a) shows a state in which the hole 14a of the rotating part 14 enters the area of the intake hole 10a of the intake branch pipe 10 of the fixed shaft part 13, and the sheet 1 is fully sucked. Strong suction force 7 is working.

The state shown in FIG. 2B is a state in which the rotating portion 14 is slightly rotated as compared with the state shown in FIG.
14a is still the intake hole 10a of the intake branch pipe 10 of the fixed shaft portion 13.
And the sheet 1 is maintained in a full suction state.

The state shown in FIG. 2C is a state in which the rotating unit 14 has rotated a little more than the state shown in FIG. 2B.
(B) shows the intake hole 10a of the intake branch pipe 10 of the fixed shaft portion 13.
A part of the hole 14a of the rotating part 14 located within the range of the above moves to the outside of the range of the intake hole 10a of the intake branch pipe 10, and the suction force 7 is compared with that in FIGS. 2 (a) and 2 (b). It has become smaller and has not been fully absorbed for a while. However, the rotating part
The hole 14a next to 14 slightly enters into the range of the intake hole 10a of the intake branch pipe 10 of the fixed shaft portion 13, and a weak induced intake 12 is generated. The corresponding induced suction force 11 acts to slightly attract the sheet 1 to the suction roller 8.

By repeating the state described with reference to FIGS. 2A to 2C, the sheet 1 is moved in the direction of the arrow 2 in the conveying direction.
Conveyed in the direction.

FIG. 3 is a diagram schematically showing the entire suction roller. FIG. 3A is a cross-sectional view of the suction roller, and FIG. 3B is a front view of the suction roller. In FIG. 3, reference numeral 22 denotes a bearing for smoothly rotating the rotating portion 14 with respect to the fixed shaft portion 13 of the suction roller 8, and 23 denotes a fixed shaft portion 13 of the suction roller 8.
Reference numeral 24 denotes a main intake drawn from the main suction pipe 5.

In FIG. 3 (a), the main suction pipe 5 and the suction branch pipe 10 are disposed in the fixed shaft portion 13 of the suction roller 8, and a plurality of holes are formed in the rotating portion 14 of the suction roller 8. 14
a is drilled, and the rotating part is
Bearings 22 between them to rotate 14 smoothly
Is provided.

In FIG. 3B, a plurality of holes 14a are provided in a rotating portion 14 which is a surface of the suction roller 8,
Of these, suction is performed only from the hole 14a in contact with the sheet, that is, the hole 14a located within the range of the intake hole 10a of the intake branch pipe 10 provided in the fixed shaft portion 13. The main intake pipe 5
Is arranged on the fixed shaft portion 13 of the suction roller 8 which does not rotate, so that the structure can be simply constructed.

FIG. 4 is a block diagram of a transport system in the printer. In FIG. 4, reference numeral 31 denotes a conveyance control unit that comprehensively controls a sheet conveyance system, 32 denotes a sheet detection sensor that detects the presence or absence and size of a sheet, and 33 denotes that the user himself / herself sets the thickness of the sheet. Sheet thickness setting switch,
34 is a motor used to drive the suction roller and the pickup roller, 35 is a pump for generating intake air (in particular, it can be replaced by a fan, even if it is not a dedicated pump), and 36 is suction with the suction side of the pump 35 Suction pipe connecting the main intake pipe of the rollers, 37 is connected to the discharge side of the pump 35 and is a main exhaust pipe for discharging the air sucked through the suction pipe 36, and 38 is suction for controlling the suction amount and the like of the pump 35 The pressure control unit 39 controls the driving state of the roller drive motor 34 to the transport control unit 31.
A suction roller drive information line for transmitting information from the sheet thickness setting switch 33 to the suction pressure control unit 38 via the conveyance control unit 31; Transfer control unit for information from sensor 32
A sheet detection sensor information line transmitted to the suction pressure control unit 38 via 31, and 42 turns the pump 35 ON / O depending on the recording condition or the like.
An ON / OFF line 43 is an instruction line for performing FF, and a suction control line 43 is an instruction line for controlling the suction pressure of the pump 35.

In the figure, the control of the suction roller 8 varies depending on the thickness and size of the sheet to be used. Specifically, for example, when the sheet thickness is large, the suction pressure is increased, and when the sheet thickness is small, the suction pressure is reduced to prevent the occurrence of sheet skew and wrinkles. That is, a work such as closing the suction hole of the suction roller (the hole 14a of the rotating unit 14 or the suction hole 10a of the suction branch pipe 10) with which the sheet does not contact is performed. That is, by locking the suction pressure control unit 38 via the conveyance control unit 31 in accordance with information from the sheet detection sensor 32, the sheet thickness setting switch 33, and the like, the suction amount according to the sheet is optimized.

FIG. 5 is a schematic sectional view showing a schematic configuration of the printer. In FIG. 5, reference numeral 51 denotes a guide pipe for sliding the recording head for smoothly moving the recording head 3 right and left (in the width direction intersecting with the sheet conveying direction).
Is a mounting table on which a plurality of sheets 1 can be mounted, 53 is a mounting table 52
Pickup roller for feeding one sheet above
Numeral 54 is a feed roller that conveys only one sheet in conjunction with the retard roller 55 when a plurality of sheets are fed by the pickup roller 53, and numeral 55 is a conveyance direction that interlocks with the feed roller 54 to eliminate double feeding. Retard roller that acts to return the extra sheet by applying the opposite torque
57 is a paper feed roller for conveying one sheet conveyed by the feed roller 54 and the retard roller 55 to the recording unit, and 58 is a driving force for rotating the adsorption roller 8 for adsorbing and conveying the recorded sheet. It is a transmission gear.

FIG. 6 is a perspective view of the main part of the transport system of the printer, showing the internal structure of the main part in a three-dimensional manner. In FIG. 6, a hole 14 provided in the rotating portion 14 for sucking a sheet is provided.
“a” is provided on a trajectory line drawn by the intake branch pipe 10 fixed to the fixed shaft portion 13 by the rotation of the rotating portion 14.

As described above, according to the present embodiment, the non-recording surface side of the sheet on which recording has been performed is provided on the fixed shaft portion 13 through the hole 14 a formed in the rotating portion 14 of the suction roller 8. Since the sheet is conveyed while rotating the rotary unit 14 to switch the hole 14a while adsorbing to the portion facing the branch pipe 10 (portion of the intake hole 10a), the sheet conventionally required is No transport system parts such as spurs in contact with the recording surface of the sheet are required, so that ink contamination of the recording surface by the transport system parts in contact with the recording surface of the sheet can be prevented, and marks such as perforations are formed. Can be prevented.

Further, by sucking only the surface where the sheet and the suction roller are in contact, the suction sound can be suppressed to the minimum necessary level.

[Second Embodiment] A recording apparatus provided with a sheet conveying apparatus according to a second embodiment will be described in detail with reference to FIGS. Since the schematic configuration of an ink jet printer as a recording apparatus is substantially the same as that of the above-described embodiment, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

For example, in the case of a thin sheet of special paper or a film-like sheet, if the sheet is sucked by the above-mentioned suction roller, the sheet is likely to wind around the suction roller. Thus, in the present embodiment, the first
In addition to the configuration of the embodiment, a mechanism for improving the separation of the sheet from the suction roller is provided.

FIG. 7 is a sectional view showing a schematic configuration around the suction roller according to the present embodiment. In FIG. 7, reference numeral 61 denotes a plurality of exhaust branch pipes for exhausting air from the holes 14a of the rotating portion 14 on the suction roller surface, 62 denotes an exhaust main pipe for supplying exhaust to the exhaust branch pipe 61, and 63 denotes an exhaust main pipe. Exhaust that is ejected from the suction roller 8 to the sheet 1 via the pipe 62 and the exhaust branch pipe 61, 64 is an exhaust force that is a vector that acts on the sheet 1 in a direction away from the suction roller 8 by the ejected exhaust 63. is there.

In the same figure, when sucking a sheet,
There is no problem as long as the anti-bending performance is comparable to that of plain paper. However, in the case of an extremely thin sheet such as a special glossy paper or a film, the sheet may be wrapped around the suction roller 8. An object of the present invention is to solve the contradictory problems of adsorption performance and smooth paper separation.

FIG. 7 shows a basic method of realizing the mechanism. An exhaust main pipe 62 is provided in the fixed shaft portion 13 of the suction roller 8 in the same manner as the intake main pipe 5, and the intake main pipe 5 sucks the main exhaust pipe. The exhaust air is discharged from the hole 14 a of the rotating unit 14 to the sheet 1 adsorbed by the adsorption roller 8 via the exhaust main pipe 62 and the exhaust branch pipe 61. As a result, the discharge force 75 of the exhaust gas 73 acts on the sheet 1 so as to separate from the suction roller 8, so that the sheet 1 can be prevented from winding around the suction roller 8. The exhaust branch pipe 61 branched from the exhaust main pipe 62 arranged in parallel with the intake main pipe 5 discharges air downstream of the intake branch pipe 10 in the sheet conveying direction as shown in FIG. It is arranged.

FIGS. 8A to 8C show a series of operations according to the present embodiment in chronological order in detail. First, in FIG. 8A, the exhaust hole of the exhaust branch pipe 61 for promoting paper separation is shown.
61a is shut off by the rotating unit 14, and the exhaust 63 is not injected into the seat 1, but sucks the seat 1 only by the intake air 6.
In FIG. 8B, the rotation of the rotating unit 14 advances, and the exhaust branch pipe
The exhaust hole 61a of the rotating member 14 is slightly opened by the hole 14a of the rotating portion 14, and the exhaust 63 is ejected onto the sheet 1 and acts in a direction away from the suction roller 8, thereby preventing the sheet 1 from winding around the suction roller 8. ing. In FIG. 8C, the rotation of the rotating part 14 further advances, and the exhaust hole 61a of the exhaust branch pipe 61 is
The exhaust 63 is ejected to the sheet 1 with the exhaust capacity fully opened and acts in a direction away from the suction roller 8 to completely prevent the sheet 1 from winding around the suction roller 8. I have. At this time, in order to prevent the performance of the exhaust 63 and the performance of the intake air 6 from being reversed, the intake side is taken care of by sucking through the two holes 14a. In addition, as a structural measure to balance the exhaust gas 73 and the intake air 6, the pipe diameter from each main pipe to the surface of the suction roller is dealt with.

By repeating the states shown in FIGS. 8A to 8C, the sheet 1 is conveyed in the direction indicated by the arrow 2 without being wound around the suction roller 8.

FIG. 9 is a diagram schematically showing the entire suction roller provided with a paper separation accelerating mechanism. FIG. 9A is a sectional view of the suction roller, and FIG. 9B is a front view of the suction roller. As shown in FIG. 9, an exhaust system pipe such as the exhaust main pipe 62 described above is newly added to the configuration of the first embodiment. In the drawing, reference numeral 65 denotes main exhaust gas exhausted from the exhaust main pipe 62.

FIG. 10 is a block diagram of a transport system provided with a suction roller provided with a paper separation promoting mechanism. In FIG. 10, 71
Is an exhaust branch point for branching part of the main exhaust from the main exhaust pipe 37 to use the main exhaust to promote paper separation, 72 is an exhaust pressure adjusting valve for controlling the exhaust branched at the exhaust branch point 71, and 73 is an adsorption An auxiliary exhaust pipe 74 for supplying exhaust to the roller 8 is an exhaust control line which is an instruction line for controlling exhaust by the exhaust pressure adjusting valve 72.

In the same drawing, as in the suction pressure control (optimization of the suction amount), the exhaust control (optimization of the exhaust amount) also includes a sheet detection sensor 32 for detecting the presence or absence and size of the sheet, and the sheet thickness of the user. According to the information of the sheet thickness setting switch 33 and the like, the exhaust pressure adjusting valve electrically controls a mechanical mechanism to optimally control the exhaust amount.

FIG. 11 is a perspective view of the main part of the main part of the transport system, which shows the internal structure of the main part in a three-dimensional manner. In FIG. 11, a hole 14a provided in the rotating portion 14 is a hole that is used for both suction and exhaust for improving the suction or separation of the sheet. That is, in the drawing, the intake branch pipe 10 and the exhaust branch pipe 61 are arranged on the same locus drawn by the hole 14a of the rotating part 14 when the rotating part 14 rotates about the axis of the suction roller 8. ing.

As described above, according to this embodiment, the fixed shaft portion is formed through the hole 14a provided in the rotating portion 14 of the suction roller 8.
13 (exhaust hole 61)
From section a), the sucked air is exhausted from the sheet 1 adsorbed to the rotating portion 14 of the adsorbing roller 8, so that in addition to the effects of the first embodiment, the sheet 1 Can be prevented from winding around the suction roller 8.

Further, non-adsorption (intake hole of intake branch pipe 10)
10a is blocked), induction suction (intake branch pipe)
The sequence of suction (the state where the intake hole 10a of the intake pipe 10 is about half open), suction (the intake hole 10a of the intake branch pipe 10 is fully opened), exhaust (exhaust from the exhaust hole 61a of the exhaust branch pipe 61), and non-adsorption. By repeating, smooth adsorption and paper separation can be realized.

Third Embodiment A recording apparatus provided with a sheet conveying apparatus according to a third embodiment will be described in detail with reference to FIG. Since the schematic configuration of an ink jet printer as a recording apparatus is substantially the same as that of the above-described embodiment, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

In this embodiment, in addition to the configuration of the first and second embodiments described above, the sheet is preliminarily (auxiliarily) drawn to the suction roller before the sheet is completely sucked by the suction roller. In this way, the linear suction roller is configured so as not to make point contact with the cylindrical suction roller but to make surface contact slightly in a curved manner. As a result, the area of the sheet in contact with the suction roller is enlarged to completely cover the hole, so that air leakage generated from a gap generated between the sheet and the hole can be drastically reduced, and high suction performance can be achieved. be able to.

In FIG. 12, reference numeral 10a denotes a suction hole which is a main suction hole for sucking the sheet 1, and 81 denotes a guide having a guide hole 81a for performing auxiliary suction for drawing the sheet 1 to the suction roller 8. Intake pipe, 63 is exhaust main pipe 62
12 is an induction suction for drawing the sheet 1 to the suction roller 8, 11 is an induction suction force generated by the induction suction 12, and 1 a is a sheet suction generated by the induction suction force 11. This is a deformed (curved) portion.

In the figure, since the contact area between the cylindrical suction roller 8 and the linear sheet 1 is extremely small, the sheet 1 is deformed by the induced suction force 11 as much as possible.
To increase the area of contact between the suction roller 8 and the sheet 1. Thereby, in addition to the effects of the above-described embodiment, almost complete adsorption without air leakage can be realized.

Further, as described above, non-adsorption (a state in which the intake hole 10a of the intake branch pipe 10 is closed), induction adsorption (a state in which the induction hole 81a of the induction intake pipe 81 is open), and adsorption ( By repeating the sequence of the intake branch pipe 10 with the intake hole 10a fully opened), exhausting (exhausting from the exhaust hole 61a of the exhaust branch pipe 61), and non-adsorption, smooth adsorption and paper separation can be realized.

Fourth Embodiment A recording apparatus provided with a sheet conveying device according to a fourth embodiment will be described in detail with reference to FIG. Since the schematic configuration of an ink jet printer as a recording apparatus is substantially the same as that of the above-described embodiment, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

In the present embodiment, a by-product, that is, sucked air is discharged toward the heating element of the apparatus, thereby obtaining a cooling effect. In FIG. 13, reference numeral 91 denotes a heating element in the apparatus, and reference numeral 92 denotes an exhaust port from the main exhaust pipe 37. The first mentioned above
In the embodiment, the exhaust gas after the suction is not reused,
In the present embodiment, the exhaust gas is blown to the heating element 91 in the device, so that the exhaust gas is actively recycled as a heat dissipation medium.

[Fifth Embodiment] A recording apparatus provided with a sheet conveying apparatus according to a fifth embodiment will be described in detail with reference to FIG. Since the schematic configuration of an ink jet printer as a recording apparatus is substantially the same as that of the above-described embodiment, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

In the present embodiment, the heating element whose temperature has risen in the apparatus and the surrounding warm air are used as an exhaust supply source, and are used to promote quick drying after ink application. In FIG.
Reference numeral 93 denotes an exhaust pump such as an air-cooling fan for collecting heat of the heating element 91; 94, ink ejected from the recording head 3; 95, applied ink in a state where the ejected ink 94 adheres to the sheet 1; Draws warm air 97 from the heating element 91 into the suction roller 8 (
A warm air pipe 97 for sending to the exhaust main pipe of the exhaust pipe 97 is warm air flowing out of the heating element 91. In the figure, the exhaust is heated by a warm air 97 coming out of a heating element 91 in the apparatus via an exhaust main pipe 62 and an exhaust branch pipe 61 (see FIG. 7) used for accelerating the paper separation, so that the exhaust air becomes warm. 1 is sprayed from the non-recording surface to raise the temperature of the sheet to make the applied ink 95 easier to dry (promote the quick drying of the ink).

Sixth Embodiment A recording apparatus provided with a sheet conveying device according to a sixth embodiment will be described in detail with reference to FIGS. Since the schematic configuration of an ink jet printer as a recording apparatus is substantially the same as that of the above-described embodiment, members having the same configuration and function are denoted by the same reference numerals, and detailed description is omitted.

In the above-described embodiment, the case where the cylindrical rotating portion 14 is used as the rotating portion (rotor) constituting the transport means has been exemplified. However, in the present embodiment, a belt is used. In FIG. 15, reference numeral 15 denotes a belt that makes surface contact with the sheet 1 instead of point contact, 16 denotes an arrow indicating a traveling direction (sheet conveying direction) of the belt 15, and 17 denotes a rotation direction when the belt 15 turns. Arrows 5B to 5D indicate that suction holes are further required for surface-sucking the sheet 1, and additional suction main pipes are used. 24B to 24D are for sucking sheets from the added main suction pipes 5B to 5D. Is the main intake.

The sheet conveying apparatus according to the present embodiment shown in FIG. 15 is used not only for conveying a sheet after ink application (after recording) as shown in FIG. 16 but also before ink application (before recording). By doing so, the sheet is suctioned by surface contact, so that stable suction can be performed.

FIG. 16 is a schematic cross-sectional view showing an example in which the above-mentioned transport system is used in an actual printer. As shown in FIG. 16, a suction hole (intake main pipe 5)
By adopting the configuration B), the gap between the recording head 3 and the sheet 1 can be kept constant. Further, when a large amount of ink is applied to a specific portion of the sheet, the sheet may be bent beyond the ink absorbability of the sheet. However, even in such a case, the sheet is bent according to the above configuration. Can be minimized,
It is possible to greatly improve dot deviation and the like in high-definition printing.

[Other Embodiments] In the above embodiment,
Although a printer is illustrated as an example of a recording apparatus, the present invention is not limited to this. For example, another recording apparatus such as a copying machine or a facsimile apparatus may be used. Similar effects can be obtained by applying the invention.

In the above-described embodiment, the sheet conveying apparatus for conveying a sheet such as a recording sheet as a recording target is exemplified. However, the present invention is not limited to this. The same effect can be obtained by applying the present invention to a sheet conveying device that conveys the sheet.

In the above-described embodiment, the ink jet system is exemplified as the recording system. However, the present invention is not limited to this, and another recording system such as an electrophotographic system may be used.

[0059]

As described above, according to the present invention,
For example, by rotating the rotating unit while adsorbing the non-recording surface side of the sheet on which the recording has been performed to a portion opposed to the intake branch pipe provided on the fixed shaft unit via a hole provided in the rotating unit of the transporting unit. Since the sheet is transported while switching the holes,
Conventionally necessary transport system parts such as spurs in contact with the recording surface of the sheet are no longer necessary, so that ink contamination of the recording surface by the transport system parts in contact with the recording surface of the sheet can be prevented, and Such marks can be prevented from being formed.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a schematic configuration around a suction roller in a printer according to a first embodiment.

FIGS. 2A and 2B are main-portion cross-sectional views illustrating a state in which the suction roller conveys a sheet in a time-series manner. FIG. Figure showing a state where the sheet is being sucked from two holes

FIG. 3 is a view schematically showing the entire suction roller;
(A) is a sectional view, (b) is a front view

FIG. 4 is a block diagram of a transport system in the printer according to the first embodiment.

FIG. 5 is a schematic sectional view showing a schematic configuration of the printer according to the first embodiment.

FIG. 6 is a perspective view of a main part of the main part of the transport system of the printer, which shows the internal structure of the main part three-dimensionally.

FIG. 7 is a schematic cross-sectional view illustrating a schematic configuration around a suction roller in a printer according to a second embodiment.

FIGS. 8A and 8B are cross-sectional views showing a state in which the suction roller conveys a sheet in a time-series manner, wherein FIG. 8A is a view in which the sheet is not exhausted, and FIG. The figure of the state where it started and the state where the air is exhausted to the seat

FIG. 9 is a view schematically showing the entire suction roller;
(A) is a sectional view, (b) is a front view

FIG. 10 is a block diagram of a transport system in a printer according to a second embodiment.

FIG. 11 is a schematic sectional view showing a schematic configuration of a printer according to a second embodiment.

FIG. 12 is a schematic cross-sectional view illustrating a schematic configuration around a suction roller in a printer according to a third embodiment.

FIG. 13 is a block diagram of a transport system in a printer according to a fourth embodiment.

FIG. 14 is a block diagram of a transport system in a printer according to a fifth embodiment.

FIG. 15 is a perspective view of a main part of the transfer system of the printer according to the sixth embodiment, showing the internal structure of the main part in a three-dimensional manner.

FIG. 16 is a schematic cross-sectional view illustrating a schematic configuration of a printer according to a sixth embodiment.

FIG. 17 is an explanatory view of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sheet 1a ... Deformed part 3 ... Recording head 4 ... Head pedestal 5 ... Intake main pipe 5B-5D ... Intake main pipe 6 ... Suction 7 ... Suction force 8 ... Suction roller 10 ... Suction branch pipe 10a ... Suction hole 11 ... Induction suction force 12 ... Induction suction 13 ... Fixed shaft part 14 ... Rotating part 14a ... Hole 15 ... Belt 22 ... Bearing 23 ... Shaft 24 ... Main intake 24B ~ 24D ... Main intake 31 ... Transport control part 32 ... Sheet detection sensor 33 ... Sheet thickness setting switch 34 ... Motor 35 ... Pump 36 ... Suction pipe 37 ... Main exhaust pipe 38 ... Suction pressure control unit 39 ... Suction roller drive information line 40 ... Sheet thickness information line 41 ... Sheet detection sensor information line 42 ... ON / OFF Line 43… Suction control line 51… Guide pipe 52… Placement table 53… Pickup roller 54… Feed roller 55… Retard roller 56,57… Paper feed roller 58… Driving force transmission gear 61… Exhaust Pipe 61a… Exhaust hole 62… Exhaust main pipe 63… Exhaust 64… Exhaust power 65… Main exhaust 71… Exhaust branch point 72… Exhaust pressure regulating valve 73… Auxiliary exhaust pipe 74… Exhaust control line 81… Induction intake pipe 81a… Induction Hole 91: Heating element 92: Exhaust port 93: Exhaust pump 94, 95: Ink 97: Warm air

Claims (8)

[Claims] 1. A fixed shaft portion provided with a plurality of intake branch pipes branched from an intake main pipe arranged side by side on a shaft and reaching the outer periphery toward a sheet conveying path, and a plurality of holes provided to form a center on the fixed shaft portion. And a suction unit for sucking air from an intake branch pipe provided in the fixed shaft portion through a hole provided in the rotation unit of the transfer device. Having a portion opposed to an intake branch pipe provided on a fixed shaft portion via a hole provided in a rotating portion of the transporting means, and rotating the rotating portion to switch the hole to transfer the sheet. A sheet conveying device for conveying. 2. A fixed shaft portion of the conveying means is configured to divide a plurality of exhaust branch pipes branching from an exhaust main pipe arranged in parallel with the shaft and reaching an outer periphery toward a sheet conveying path in a sheet conveying direction from the intake branch pipe. Provided on the downstream side, the sucked air was discharged from a portion facing the exhaust branch pipe provided on the fixed shaft portion through a hole provided in the rotating portion of the transporting device, and was adsorbed on the rotating portion of the transporting device. The sheet conveying device according to claim 1, wherein the sheet is peeled. 3. A fixed shaft portion of the conveying means includes a plurality of auxiliary intake branch pipes branched from the main intake pipe and reaching the outer periphery toward a sheet transport path, at a position upstream of the intake branch pipe in the sheet transport direction. Suctioning air from a portion facing an auxiliary intake branch pipe provided in a fixed shaft portion through a hole provided in a rotating portion of the transporting device, and pulling a sheet near a rotating portion of the transporting device. The sheet conveying device according to claim 1, wherein: 4. The sheet conveying apparatus according to claim 1, further comprising a pipe for guiding the sucked air to a heating element, and discharging the sucked air to the heating element from an outlet of the pipe. . 5. An exhaust branch pipe provided on a fixed shaft portion through a hole provided in a rotating portion of the transporting device, comprising intake means for taking in warm air around the heating element. The sheet conveying apparatus according to claim 2, wherein the sheet is discharged from a portion where the sheet is to be discharged. 6. The sheet conveying device according to claim 1, wherein the sheet conveying device is configured to:
Sheet detecting means for detecting the size, presence or absence, etc .; and suction pressure controlling means for controlling the amount of sheet suction by the suction means based on information from the sheet detecting means. The sheet conveying device according to claim 1, wherein a suction amount of the suction unit is controlled based on the conditions. 7. A recording apparatus for recording on a sheet,
7. A recording apparatus comprising the sheet conveying apparatus according to claim 1 as a conveying means for conveying a sheet on which recording has been performed. 8. The recording apparatus according to claim 7, wherein the recording apparatus is an ink jet recording system in which recording means performs recording by discharging ink according to a signal.