JP2008149481A - Inkjet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an inrush shock to a roller when rolled paper is automatically loaded. <P>SOLUTION: The inkjet recorder has a holding means which holds the recording paper wound in a roll shape, a recording means which carries out recording to the recording paper, a first conveying means which is arranged between the recording means and the holding means and conveys holding the recording paper, and a second conveying means which is arranged at the opposite side to the first conveying means with respect to the recording means and conveys holding the recording paper. Recording is carried out while the recording paper is conveyed in a direction from the second conveying means towards the first conveying means, from a state with the recording paper held by the first conveying means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ink jet recording apparatus that performs a recording operation by discharging a liquid such as ink, and an ink jet recording head used in the recording apparatus. The present invention can be applied to a general printing apparatus, a copying machine, a facsimile having a communication system, an apparatus such as a word processor having a printing unit, or a multifunction recording apparatus combining these apparatuses. In particular, it is suitably applied to a full-line type recording apparatus that performs high-speed and high-quality printing.

  The present invention is applied to a full-line type printer that performs recording with a long inkjet head having a width of a recording medium on a recording medium fed by a conveyance belt. The present invention is applied to a roll paper conveyance type full-line inkjet printer.

  First, a full line type ink jet printer will be described. Among ink jet recording apparatuses, those possessing a recording head having a printing width comparable to that of a recording medium called a full line type ink jet head can achieve overwhelming high-speed printing as compared with a serial type printer. Therefore, in recent years, development for use as a printer in an office is desired.

  First, an outline of the full line type printer will be described. In FIG. 8, 40Bk, 40Y, 40M, and 40C are bubble jet (registered trademark) type recording heads corresponding to black, yellow, magenta, and cyan ink colors, respectively. Each recording head has an electrothermal conversion element as an ejection energy generating means, and ejects ink droplets from ejection ports using bubbles generated in the ink when energized as pressure sources, and is fixed to the block 40.

  Further, the block 40 is provided with a read head 41 for detecting ejection / non-ejection ejection port numbers.

  Reference numeral 45 denotes a platen disposed to face each recording head.

  A paper discharge tray 76 sequentially stocks the discharged recording sheets.

  Next, the operation of the full line printer apparatus having the above configuration will be described. In this configuration, the procedure for feeding and recording roll paper first is shown below.

  The roll paper 101 is rotatably supported in the holder 100 via a spool (not shown), and the roll paper 101 is set in a state where its leading end is sandwiched between the paper feed rollers 48.

  The recording operation starts with a roll paper feeding operation. The paper feed roller 48 rotates to roll out the roll paper from the holder. Thereafter, the image is conveyed to the image forming unit by guidance of the conveyance path 50.

  Next, the roll paper conveyance configuration will be described. After the above-described paper feeding operation is completed, the rotation of the transport roller 121 is transmitted from a motor (not shown) provided outside to transport the roll paper. When the conveyance is started, the leading edge of the roll paper is conveyed to the lower part of the image forming unit, and is first conveyed to the lower part of the cyan head 40C provided on the most upstream side. After being conveyed to the lower part of the cyan head 40C, the leading edge of the roll paper enters a spur 82 provided between the cyan head 40C and the magenta head 40M before being conveyed to the lower part of the next magenta head 40M. The roll paper 90 is prevented from floating, and the roll paper 90 is prevented from being rubbed against the head 40.

  Next, an image forming operation is started, and an image is formed by the image recording head 40 on the recording paper held on the platen 45. When the image forming operation is completed, the recording unit on the recording paper is conveyed until it reaches a position downstream of the cutter 60, and then the roll paper is cut by the cutter 60. Then, the image-formed portion of the recording paper is discharged out of the apparatus by the paper discharge roller 63.

  As printers for forming images on roll paper with a recording head, there are printers disclosed in Patent Document 1 and Patent Document 2.

  Next, an inkjet head to which the present invention is applied will be described with reference to FIG. FIG. 9 shows a cross-sectional view of the full-line type ink jet head in the short direction. As shown in FIG. 9, the inkjet head to which the present invention is applied has a support substrate 102 in which a recording element substrate 101 having an electrothermal transducer 613 for discharging ink is made of a material such as alumina or carbon graphite. Is placed on top. Further, a chip tank 107 is disposed on the surface of the support substrate 102 opposite to the surface on which the recording element substrate 101 is disposed, and ink is stored in an area surrounded by the support substrate 102 and the chip tank 107. Has been. Further, the support substrate 102 is provided with a filter 105 for preventing dust mixed in the ink supplied to the ink jet head 40 from reaching the recording element substrate 101. The ink in the chip tank 107 is supplied to the recording element substrate 101 through the filter 105, through the filter lower liquid chamber 110.

  Next, the recording element substrate 101 having the electrothermal transducer 613 to which the present invention is applied will be described. FIG. 10 shows a fracture structure of the recording element substrate 101. The recording element substrate 101 according to the present embodiment has an electrothermal transducer 613 formed on a silicon substrate having a thickness of 0.5 mm to 1 mm using a film forming technique. A discharge port 604 and the like are formed. Further, an ink supply port 109 is formed in the recording element substrate 101, and the ink supplied to the head 40 is guided to the ejection port 604.

  On both sides of the ink supply port 109, a plurality of electrothermal transducers 613 arranged in two rows at a predetermined interval along the transport direction of the print medium, that is, the longitudinal direction of the ink supply port 109 are shifted from each other by a half pitch. Is formed. And each comprises the discharge energy generation part. In addition to these electrothermal transducers 613, the recording element substrate 101 includes electrode terminals for electrical connection between the electrothermal transducers 613 and the printer main body and electrical wiring (not shown) formed of aluminum or the like. It is formed by membrane technology.

  The electrical wiring substrate connected to the electrode terminals formed on the recording element substrate 101 is for applying an electrical signal for ejecting ink to the recording element substrate 101. The electrical wiring board has an electrical wiring corresponding to the recording element substrate 101 and a contact part (not shown) that is located at the end of the electrical wiring and receives an electrical signal from the printer main body. A drive signal for the electrothermal converter 613 is given from a drive IC (not shown) via the electric wiring board, and at the same time, drive power is supplied to the electrothermal converter 613.

The liquid supplied from the ink supply port 109 into each ink path boils as the electrothermal converter 613 generates heat when a drive signal is given to the electrothermal converter 613 facing the corresponding ink path. Is discharged from the discharge port 604 by the pressure of the bubbles generated by the above and printed on the recording medium.
Japanese Patent Laid-Open No. 9-1883 JP 2002-307724 A

  In the roll paper roller conveyance configuration, there is a concern about conveyance registration misalignment due to a rush shock that occurs when nipping the roller during autoloading. The roll paper conveyance state at the time of the rush shock will be described with reference to FIG. When the roll paper leading edge 901 passes through the lower part of the inkjet heads 40C, 40M, 40Y, and 40BK by the upstream side conveyance roller 80 and enters the downstream side conveyance roller 81, a conveyance registration error due to a rush shock occurs in the conveyance direction. On the other hand, when the roll paper front end 901 enters the downstream side conveyance roller 81, recording is started on the roll paper 90 by the inkjet head in order to reduce waste paper at the front end of the roll paper. For this reason, the conveyance direction misregistration at the time of entry affects the actual print image.

  Accordingly, an object of the present invention is to eliminate image disturbance due to a rush shock to a roller pair (spur) during loading.

The configuration of the present invention for achieving the above object is as follows.
Holding means for holding the recording paper wound in a roll;
Recording means for recording on recording paper;
A first conveying unit disposed between the recording unit and the holding unit and configured to sandwich and convey a recording sheet;
A second conveying unit disposed on the opposite side of the first conveying unit with respect to the recording unit and sandwiching and conveying the recording paper;
A recording apparatus that performs recording while conveying a recording sheet from the second conveying unit toward the first conveying unit from a state in which the recording sheet is sandwiched by the first conveying unit. .

  According to the present invention, it is possible to eliminate image disturbance due to a rush shock to a roller during loading.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A first embodiment to which the present invention is applied will be described. In the present embodiment, as shown in FIG. 1, a full line type ink jet recording head having a width equal to or larger than the width of a printing medium fixed to the apparatus main body is used. A total of four full-line type ink jet recording heads are provided along the recording medium transport direction (paper transport direction) so as to eject black, yellow, magenta, and cyan inks, respectively. A platen 45 that supports the roll paper to be conveyed is provided below the head 40. A spur-like rotator 82 is rotatably provided between each head, and the spur-like rotator 82 constitutes a paper pressing mechanism that presses the roll paper 90 against the platen 45 by a spring bias. It is a rotating member.

  Furthermore, there is a paper feed unit 92 provided with a holder 91 that is a holding means for holding roll paper (recording paper wound in a roll shape) upstream of the conveyance. Between the paper supply unit 92 and the recording head 40, an upstream side conveyance roller pair 80 which is a first conveyance unit for conveying the roll paper 90 is provided. The upstream conveying roller 80 is driven by a driving source such as a stepping motor (not shown). Further, immediately after the paper feed unit, a cutter unit including a cutter 60 for cutting roll paper and a paper discharge tray 76 for stocking the cut paper upstream of the paper feed unit 92 are provided. On the other hand, a buffer area 93 for temporarily storing the roll paper 90 is provided on the most downstream side.

  A printing operation in the ink jet recording apparatus having such a configuration will be described. As an initial state before the start of printing, in order to shorten the time until the initial printing, the roll paper of the paper supply unit 92 is conveyed in the first direction toward the downstream side and sent to the buffer area 93 for N sheets in advance. It is wound and stocked on a winding shaft 93a in the area. When a print command is issued from a controller provided inside the apparatus (not shown), there are two cases.

  (1) When the required number of printed sheets (M) is less than N, the upstream conveying roller 80 as the first conveying means is rotated in the clockwise direction in FIG. Printing is performed while transporting in a second direction opposite to the direction and returning to the paper feeding unit side (upstream) side. When the leading end of the printed area printed on the roll paper is conveyed to the lower part of the cutter, a cutting operation is performed by the cutter, and then the paper path before the paper feeding unit is switched and conveyed to the paper discharge tray 76. .

  (2) When the required number of prints (M) is larger than N, a large amount of printing is performed by carrying out several transport operations. That is, when a print command is issued from a controller (not shown), first, N sheets are printed while the transport upstream roller 80 is rotated clockwise, the paper path 94 before the paper feed unit is switched, and the cutter is used as described above. After the cutting operation, the paper is discharged to the paper discharge tray 76. Thereafter, the paper path 94 is returned to the roll paper feed position, the transport upstream roller 80 is rotated counterclockwise, and the roll paper 90 is transported in the direction of the paper buffer area 93 (downstream). At this time, since printing is not performed and the paper is merely stocked in the paper buffer area 93, it may be conveyed at an ultra high speed. Thereafter, by repeating the same sequence, a large amount of printing can be achieved.

  Further, after all the printing operations are completed, before the next print command is received, N sheets are conveyed in advance to the buffer area 93 to prepare for the next printing.

  Since printing is performed during reverse conveyance of already loaded paper in this way, it is possible to prevent the occurrence of misregistration due to a rush shock.

  Furthermore, a decurling mechanism for taking up the curl of the roll paper can be provided in the paper buffer unit 93. By providing a decurling mechanism before printing, it is possible to improve the conveyance accuracy by making it less susceptible to curling.

  The rotation of the upstream conveying roller 80 is read using a rotary encoder, and the ejection information is fed back to the inkjet recording head 40.

(Second Embodiment)
A second embodiment to which the present invention is applied will be described. As shown in FIG. 2, in the present embodiment, four color heads 40 (40BK, 40Y, 40M, and 40C) that eject black, yellow, magenta, and cyan inks are disposed on the transport platen 45, and A spur 82 is provided between the heads to suppress the floating of the roll paper. A cutter 60 for cutting the roll paper is provided further downstream of the spur 82 farthest from the paper supply unit 92. Immediately after the cutter 60, a switching guide 94, which is a paper path switching mechanism for switching the paper path, is provided. Further, immediately after the paper path switching mechanism 94, a paper discharge tray 76 is provided in the downward direction, and a buffer area 93 is provided in the upward direction.

  Next, the printing operation according to this configuration will be described. As an initial state at the start of printing, the leading end 901 of the roll paper is nipped by the upstream conveying roller 80 (FIG. 2). Thereafter, when a print command for M sheets is issued from a controller portion (not shown), first, the switching guide 94 is moved to a position for guiding the roll paper 90 to the buffer area 93 by a driving source such as a rotary solenoid. Thereafter, the upstream side conveyance roller 80 and the downstream side conveyance roller 81 are rotated, and the roll paper is conveyed to the downstream side which is the paper feeding direction. Then, after the roll paper leading edge 901 is nipped by the downstream side conveyance roller 81, image printing is started. Printing is performed so that the recording is completed with respect to a portion upstream of the most upstream recording head 40C. Alternatively, all the recording heads 40BK, 40Y, 40M, and 40C may be started together. In this case, since printing cannot be performed by the recording head that has already passed, an incomplete image in which some colors are not printed is printed, and complete printing is performed in a portion upstream of the recording head 40C. . The roll paper is guided to the buffer area 93 by the switching guide 94 (FIG. 3).

  When the trailing edge of N images passes the cutter 60, the roll paper is cut by the cutter, and the switching guide 94 is switched to a position for guiding the roll paper to the paper discharge tray 76.

  The paper that is cut from the roll paper 90 and on which N images guided to the buffer area 93 are printed from the middle is stocked in the buffer area 93 and then sandwiched by the buffer section conveyance roller pair 83 that has been opened. Held.

  The recording is continuously performed for the N and subsequent images, and the roll paper on which the complete images from the (N + 1) th sheet to the Mth sheet are printed is guided to the discharge tray 76 by the switching guide 94. The roll paper is cut for each image by the cutter 60 to record MN images, and the paper cut for each image is stacked on the paper discharge tray 76.

  Thereafter, the process proceeds to a sequence for printing on the paper held in the buffer area 93. First, the switching guide 94 which is a paper path switching mechanism is moved to a position where the paper in the buffer area 93 is guided to the transport platen 45. Thereafter, the buffer paper transport roller 83 is driven to return the cut paper to the upstream side. In this way, the paper is transported to the platen 45, and after the paper is nipped by the upstream transport roller 80, the paper is transported further in the upstream direction.

  While the paper is transported in the upstream direction, printing is performed on a portion where printing near the downstream end of the paper is not performed or a portion where incomplete printing is performed (FIG. 5).

  When printing of N images to the downstream end of the paper is completed, the conveyance is started again downstream. The paper path switching mechanism 94 is moved to guide the paper to the paper discharge tray 76. The paper on which image formation for N sheets has been completed is cut for each image by the cutter 60 and discharged to the paper discharge tray 76.

  By such an operation, printing is not performed when the leading edge of the paper enters the transport roller, so that it is possible to prevent the printed image from being disturbed by the impact of the leading edge of the roll paper. In addition, printing can be performed up to the leading end of the roll paper, and continuous printing can be performed without wasting paper.

(Third embodiment)
A third embodiment to which the present invention is applied will be described with reference to FIGS. As a basic configuration, an upstream side conveyance roller 80 that determines a conveyance speed is provided at the closest part of the paper feeding unit, and further, driving is transmitted from the upstream side conveyance roller 80 by a timing belt 96 along the conveyance direction. Downstream conveying rollers 81, 81a, 81b, 81c are provided between the heads. Further, each of the downstream side transport rollers is provided with a one-way clutch 95 for restricting the driving direction from the timing belt 96. The clutch 95 removes the roll paper 90 from the paper supply unit 92 in the buffer area 93 shown in the figure. It becomes On only when transported to. Further, a relationship of φ1 <φ2 is established between the roller diameter φ1 of the upstream side conveyance roller 80 and the roller diameter φ2 of the downstream side conveyance roller 81.

  The operation will be described. The basic print sequence is as described in the first embodiment. First, the roll paper 90 is conveyed downstream from the holder 91 by the number of sheets to be printed (for example, 20 sheets) by the upstream conveying roller 80 driven by a pulse motor (not shown) before printing. The conveyed roll paper 90 is wound around the shaft of the buffer area 93 and stocked. At that time, since the clutch is On, the downstream transport roller 81 to which the drive is transmitted from the upstream transport roller 80 via the timing belt 96 also rotates.

  Next, the roll paper 90 corresponding to the number of printed sheets accumulated in the buffer area 93 is transported in the upstream direction by the upstream transport roller 80. The roll paper 90 is conveyed in a direction opposite to that during loading toward a paper discharge tray 76 provided on the paper supply unit 92 side while a printing operation is performed by the inkjet head 40. At this time, the downstream-side transport roller 81 rotates idly when the clutch is turned off, and suppresses paper floating between the head and the head while being in a low load state.

  The recorded roll paper is cut for each image by the cutter 60, guided to the paper discharge tray 76 by the movable guide 94, and stacked.

  The clutch operation and the conveyance principle of this configuration will be described in more detail with reference to FIG. FIG. 7 shows only the downstream-side transport roller 81 disposed at the most downstream position, but the same applies to the other rollers 81a, 81b, and 81c.

  The downstream side conveyance roller 81 has a clutch outer ring 951 that is rotated by driving transmitted from the upstream side conveyance roller 80 by the timing belt 96. The clutch outer ring 951 is supported so as to idle with respect to the shaft of the downstream side conveyance roller 81. The clutch outer ring 951 has a swingable ratchet claw 951a. The ratchet claw 951a is urged to swing toward the center so as to engage with the claw 952a of the inner ring 952 that rotates in synchronization with the downstream side conveyance roller 81.

  First, during loading in which the upstream conveyance roller 80 rotates counterclockwise, the ratchet claw 951a engages with the claw 952a of the inner ring 952, and the downstream conveyance roller 81 and the upstream conveyance roller 80 rotate at the same rotational speed. . Since the roller diameter φ2 of the downstream conveyance roller 81 is larger than the roller diameter φ1 of the upstream conveyance roller 80, the downstream conveyance roller 81 has a larger conveyance amount per rotation. That is, since the downstream pulling system is used, the slack of the roll paper between the head and head is eliminated, and the paper can be fed to the paper buffer region without rubbing the roll paper against the inkjet head 40.

  On the other hand, during printing, the upstream side conveyance roller 80 rotates clockwise, and the outer ring 951 of the downstream side conveyance roller 81 also rotates clockwise by the timing belt 96. At this time, the ratchet claw 951a moves in the direction of getting over the slanted side with respect to the claw 952a of the inner ring 952, and thus does not engage. Therefore, the one-way clutch 95 runs idle.

  At this time, the downstream side conveyance roller 81 is rotated following the conveyance of the roll paper, and as a result, the clutch inner ring 952 is also rotated. However, since the diameter φ2 of the downstream conveying roller 81 is larger than the diameter φ1 of the upstream conveying roller, the clutch inner ring 952 cannot catch up with the clutch outer ring 951, and is always idle, so that the load becomes low, and the head head It can be transported while preventing paper floating in between. That is, it is possible to prevent paper rubbing on the head. Furthermore, since only the upstream-side transport roller 80 is transporting the roll paper 90 during printing, the transport accuracy is determined in one place, which leads to the transport with less misregistration.

  Such a one-way clutch can also be used in a system in which a roller to be driven between the heads is disposed in order to prevent paper rubbing on the heads and jamming between the heads. Even in such a system, the one-way clutch arrangement configuration can solve the problems of conveyance accuracy and rush shock due to loading during loading.

  As described above, in the above-described embodiment, in the recording apparatus using roll-shaped recording paper, a plurality of full-line type ink jet recording heads arranged along the roll paper transport direction and paper feed for holding the roll paper Power is transmitted from the unit and the drive source, and a pair of upstream conveying rollers for conveying the roll paper is disposed on the paper feeding unit side with respect to the full-line type ink jet head, and a platen is disposed below the head, Further, a printing operation is instructed in the full-line type ink jet recording apparatus, wherein a paper pressing mechanism is disposed between the plurality of full-line type ink jet recording heads and downstream of the most downstream head. Later, in order to execute a loading operation for transporting the roll paper held in the paper feeding unit to the downstream side, The upstream transport roller pair rotates, the roll paper is transported, the predetermined number of sheets are transported in advance, the predetermined number of sheets are temporarily held in the downstream paper buffer area, and then the roller pair rotates in the reverse direction. The printing is performed while returning the roll paper to the paper feed unit side.

  Further, the present invention is characterized in that a cutter unit and a paper discharge tray are provided on the upstream side or the downstream side of the ink jet recording head group in which the ink jet heads are gathered.

  Further, the present invention is characterized by having a buffer area for temporarily holding the roll paper conveyed further downstream of the most downstream head of the ink jet recording head group.

  Furthermore, the buffer area is characterized by having a mechanism for temporarily storing the paper being conveyed while winding it.

  Furthermore, after the printing operation is completed or before the printing operation is started, the roll area is stocked for N printing areas in the buffer area.

  Furthermore, when the number of printed sheets M is smaller than the number N of stocks, printing is performed while conveying roll paper in the paper feeding direction from the initial state.

  Furthermore, when the number M of printed sheets is larger than the number N of stocks, first, N sheets are printed while the roll paper is conveyed in the paper feeding direction immediately from the initial state, and then held by the paper feeding unit. The roll paper being conveyed is conveyed to the buffer area, and thereafter, the printing operation is repeated while the roll paper is rotated in the reverse direction.

  Further, a plurality of full-line type ink jet recording heads arranged along the roll paper conveyance direction, a paper feed unit for holding the roll paper, and an upstream side where power is transmitted from a drive source to convey the roll paper A pair of conveying rollers is arranged on the paper feed unit side with respect to the full-line type ink jet head, a platen is arranged under the head, and further between the plurality of full-line type ink jet recording heads and downstream of the most downstream head. In the full-line type ink jet recording apparatus characterized in that a paper pressing mechanism is arranged on the side, after a printing operation is instructed, the upstream conveying roller pair rotates to convey the roll paper, and N After transporting the sheet to the buffer area, the sheet is cut by a cutter provided downstream of the head, The paper is transported toward the downstream side while performing the MN printing operation on the roll paper arranged at the bottom of the card, discharged to the discharge tray, and the buffer after the MN printing operation is finished. Printing is performed while returning N roll paper sheets arranged in the area toward the paper feed unit.

  Further, the present invention is characterized in that a configuration for switching between the buffer area and the paper path of the paper discharge tray is provided downstream of the cutter.

  Furthermore, the paper pressing mechanism is provided with a member that opposes the platen and is provided with a member that does not transmit drive from an external drive source and rotates with the movement of the roll paper.

  Further, the paper pressing mechanism is a rotating member to which driving is transmitted by the same or different driving source as the upstream side conveyance roller.

  Further, during the loading operation, both the upstream side transport roller and the downstream side transport roller pair rotate in a direction to transport the roll paper downstream, and during the printing operation, the upstream side transport roller and the downstream side transport roller. Both counter-guns rotate in the direction of transporting the roll paper upstream.

  Furthermore, the downstream transport roller pair group is configured to transmit driving by a timing belt from the upstream transport roller pair group, and further, the drive of the upstream transport roller pair is transmitted only in one direction. After the printing operation is instructed, the one-way clutch is rotated when the upstream conveying roller pair rotates in order to convey the roll paper held by the paper feeding unit to the downstream side. Is turned on, the pair of downstream transport rollers also rotates, and a predetermined number of sheets are temporarily held in the downstream paper buffer area, and then the upstream transport roller pair rotates in reverse at the start of the printing operation. The drive is not transmitted to the pair of downstream rollers, and printing is performed while returning the paper to the paper feeding unit side. Inkjet recording apparatus.

  Furthermore, the roller diameter φ1 of the upstream transport roller is smaller than the roller diameter φ2 of the downstream roller.

  Furthermore, the discharge information is fed back to the ink jet recording head by reading the rotation of the upstream conveying roller pair using a rotary encoder.

  Furthermore, the ink jet recording head prints one color for one head.

  Furthermore, the ink jet recording head prints two or more colors per head.

  According to the above-described embodiment, it is possible to eliminate image disturbance due to a rush shock to the roller pair (spur) during loading, and further, the position during which the printing accuracy is determined is determined by using one drive during printing. Can be achieved to achieve high-precision roll paper conveyance.

It is a figure explaining 1st embodiment in this invention. It is a figure explaining 2nd embodiment in this invention. It is a figure explaining 2nd embodiment in this invention. It is a figure explaining 2nd embodiment in this invention. It is a figure explaining 2nd embodiment in this invention. It is a figure explaining 2nd embodiment in this invention. It is a figure explaining the relationship between the two rollers of 3rd embodiment in this invention. It is a figure explaining the conventional full line type inkjet recording device. It is sectional drawing of the conventional inkjet head. It is a figure showing a mode that the roll paper front-end | tip rushes into a conveyance roller in the conventional full line type inkjet recording device.

Explanation of symbols

40 Full Line Inkjet Head 54 Discharge Roller 60 Cutter 63 Discharge Roller 76 Discharge Tray 80 Upstream Conveying Roller 81 Downstream Conveying Roller 82 Spur 90 Roll Paper 901 Roll Paper Tip 91 Holder 92 Paper Feed Unit 93 Buffer Area 94 Paper Path Switching mechanism 95 One-way clutch 951 Clutch outer ring 952 Clutch inner ring 96 Timing belt 97 Driven roller

Claims (23)

  In a recording apparatus using roll-shaped recording paper, power is transmitted from a full-line inkjet recording head that is arranged in a plurality along the roll paper conveyance direction, a paper feed unit that holds the roll paper, and a drive source, A pair of upstream-side transport rollers for transporting the roll paper is disposed closer to the paper feed unit than the full-line inkjet head, a platen is disposed at the lower part of the head, and the plurality of full-line inkjet recording heads In a full-line type ink jet recording apparatus characterized in that a paper pressing mechanism is disposed downstream of the head and the most downstream head, a roll held by the paper feed unit after a print operation is instructed In order to perform a loading operation for transporting the paper downstream, the upstream transport roller pair rotates and rotates. The paper is transported, a predetermined number of sheets are transported in advance, the predetermined number of sheets are temporarily held in the downstream paper buffer area, and then the roller pair is rotated reversely to move the roll paper to the paper feeding unit side. An ink jet recording apparatus that performs printing while returning.   2. The ink jet recording apparatus according to claim 1, wherein a cutter unit and a paper discharge tray are provided upstream or downstream of the ink jet recording head group in which the ink jet heads are gathered.   3. The ink jet recording apparatus according to claim 1, further comprising a buffer region for temporarily holding roll paper conveyed further downstream of the most downstream head of the ink jet recording head group. Inkjet recording device.   4. The ink jet recording apparatus according to claim 3, wherein the buffer area has a mechanism for temporarily storing the transported paper while winding it.   5. The inkjet recording apparatus according to claim 1, wherein roll paper is stocked for N printing areas in the buffer area after the printing operation is finished or before the printing operation is started.   6. The ink jet recording apparatus according to claim 5, wherein when the number of printed sheets M is smaller than the number N of stocks, printing is performed while conveying roll paper in the paper feeding direction from the initial state. .   In the ink jet recording apparatus according to claim 5, when the number of printed sheets M is larger than the number of stocks N, first, printing is performed for N sheets while transporting the roll paper immediately in the feeding direction from the initial state, Thereafter, the roll paper held in the paper feed unit is transported to the buffer area, and then the printing operation is repeated while the roll paper is rotated in reverse.   In a recording apparatus using roll-shaped recording paper, power is transmitted from a full-line inkjet recording head that is arranged in a plurality along the roll paper conveyance direction, a paper feed unit that holds the roll paper, and a drive source, A pair of upstream-side transport rollers for transporting the roll paper is disposed closer to the paper feed unit than the full-line inkjet head, a platen is disposed at the lower part of the head, and the plurality of full-line inkjet recording heads In the full-line type ink jet recording apparatus characterized in that a paper pressing mechanism is disposed downstream of the head and the most downstream head, after the printing operation is instructed, the upstream conveying roller pair rotates. After the roll paper is conveyed and N sheets are conveyed to the buffer area, the roll paper is provided downstream of the head. After being cut by the cutter, it is conveyed toward the downstream side while performing the MN printing operation on the roll paper arranged at the lower part of the head, discharged to the discharge tray, and printed on the MN sheet. An ink jet recording apparatus that performs printing while returning N roll papers arranged in a buffer area in a direction toward a paper feeding unit after the operation is finished.   9. The ink jet recording apparatus according to claim 8, wherein a configuration for switching a buffer path and a paper path of a paper discharge tray is provided downstream of the cutter.   10. The ink jet recording apparatus according to claim 1, wherein the paper pressing mechanism is provided with a member that faces the platen and does not transmit drive from an external drive source and rotates with the movement of the roll paper. An inkjet recording apparatus characterized by comprising:   10. The ink jet recording apparatus according to claim 1, wherein the paper pressing mechanism is a rotating member to which driving is transmitted by the same or different driving source as the upstream conveying roller. The inkjet recording apparatus according to claim 11, wherein
During the loading operation, both the upstream conveyance roller and the downstream conveyance roller pair are rotated in the direction of conveying the roll paper downstream, and during the printing operation, both the upstream conveyance roller and the downstream conveyance roller pair are rotated. An ink jet recording apparatus, wherein the ink jet recording apparatus rotates in a direction in which the roll paper is conveyed upstream.   12. The inkjet recording apparatus according to claim 11, wherein the downstream side transport roller pair is configured to transmit driving by a timing belt from the upstream side transport roller pair, and further, the upstream side transport roller pair. A one-way clutch that transmits the driving of the paper in only one direction, and after the printing operation is instructed, in order to transport the roll paper held by the paper feeding unit to the downstream side, the upstream-side transport roller pair Is rotated, the one-way clutch is turned on, the pair of downstream transport rollers is also rotated, and a predetermined number of sheets are temporarily held in the downstream paper buffer area. The transport roller pair rotates in reverse, but the drive is not transmitted to the downstream roller transport roller pair, and printing is performed while returning the paper to the paper feed unit side. And the ink-jet recording apparatus.   14. The ink jet recording apparatus according to claim 13, wherein a roller diameter φ <b> 1 of the upstream transport roller is smaller than a roller diameter φ <b> 2 of the downstream roller.   The ink jet recording apparatus according to claim 1, wherein ejection information is fed back to the ink jet recording head by reading rotation of the upstream conveying roller pair using a rotary encoder.   16. The ink jet recording apparatus according to claim 1, wherein the ink jet recording head prints one color for each head.   17. The ink jet recording apparatus according to claim 1, wherein the ink jet recording head prints two or more colors for one head. Holding means for holding the recording paper wound in a roll;
Recording means for recording on recording paper;
A first conveying unit disposed between the recording unit and the holding unit and configured to sandwich and convey a recording sheet;
A second conveying unit disposed on the opposite side of the first conveying unit with respect to the recording unit and sandwiching and conveying the recording paper;
A recording apparatus that performs recording while conveying a recording sheet in a direction from the second conveying unit toward the first conveying unit from a state in which the recording sheet is sandwiched by the first conveying unit.   When recording a plurality of images, the first transport is performed by transporting, in the first direction by the first transport unit, a portion of the recording paper on which a plurality of images are recorded from the holding unit before recording. The first direction from the second conveying unit to the first conveying unit from the state where the recording sheet is pulled out from the recording unit to the recording unit side and is sandwiched by the first conveying unit. The recording apparatus according to claim 18, wherein recording is performed while transporting in the opposite second direction.   The recording apparatus according to claim 19, wherein a cutter that cuts recording paper is disposed between the holding unit and the first transport unit, and the recording paper recorded by the recording unit is cut for each image.   When recording a plurality of images, a part of the recording paper on which the plurality of images are recorded is drawn from the holding means to the recording means side of the first conveying means before recording. The recording apparatus according to claim 19, wherein recording is performed on a recording sheet conveyed in the first direction after being sandwiched between the second conveying means.   The recording apparatus according to claim 21, wherein recording is performed while transporting in the second direction to a portion that could not be recorded by recording performed while transporting in the first direction.   The recording apparatus according to claim 21, wherein the recording is completed while being conveyed in the second direction with respect to a portion where incomplete recording is performed by the recording performed while being conveyed in the first direction.

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