JP2006206297A - Sheet transport device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet transport device capable of achieving stable transport of sheets by precluding a jam with sheet certainly in the area around the printing part. <P>SOLUTION: The sheet transport device 11 is equipped with a first transporting means 40 to feed each sheet P from the sheet feeding side onto a platen surface 51 of a printing part 43 and a second transporting means 55 to transport to downstream the sheet P having passed the printing part 43, and at the upstream end of the second transporting means 55 a guide-in member 57 is installed whereby the leading edge of the sheet P levitated from the transporting reference position 73 on the way from the printing part 43 to the second transporting means 55 is guided to the transporting reference position 73 by a guide surface 87, wherein the guide surface 87 assumes a curved surface continued from the starting end 87a set in a position a certain distance apart from the transporting reference position 73 smoothly to the periphery of a guide roller 75 on the uppermost side in the stream of the second transporting means 55. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper transport device that transports paper on a transport path from a paper feed side through a platen surface of a processing unit to a paper discharge side, and in particular, the occurrence of a paper jam around the processing unit. It relates to improvements to prevent.

For example, a printer, a facsimile, or the like incorporates a paper transport device that transports paper on a transport path from the paper feed side through the platen surface of the print processing unit to the paper discharge side.
The print processing unit in the ink jet printer includes a print head that ejects ink droplets onto the paper so as to face the platen surface through which the paper passes.

  In an inkjet printer, paper that has been folded or curled before it is fed, or that has passed through the print processing section or due to wrinkles or curls that occur on the paper due to ink droplet adhesion. Paper jam is likely to occur in the vicinity of the conveying means for nipping and conveying the sheet downstream.

  Therefore, as a paper conveying apparatus for preventing the occurrence of paper jam in these parts, conventionally, as shown in FIGS. 11 and 12, a conveying means 103 that conveys the paper 101 that has passed through the print processing unit while being sandwiched downstream thereof. In the configuration in which the guiding member 104 is provided at the upstream end of the sheet, or on the sheet fed on the platen surface, the wavy shape in the sheet width direction perpendicular to the conveying direction is continuous along the conveying direction. A structure having a cockling imparting mechanism that suppresses lifting of the sheet from the platen surface by applying the sheet is proposed (for example, see Patent Document 1).

  11 and 12 includes pressing rollers 106 and 107 for pressing the upper surface of the paper 101 at two positions spaced apart in the transport direction of the paper 101, and positions facing the pressing rollers 106 and 107. In addition, a pinch roller (not shown) that sandwiches and conveys the sheet 101 in cooperation with these pressing rollers 106 and 107 is provided.

  The guide member 104 has a guide surface 104 a located on the upstream side of the pressing roller 106 on the upstream side of the transport unit 103. The guide surface 104a includes an inclined surface 107 extending from a starting end set at a predetermined distance from a conveyance reference position (for example, a height position of the platen surface) to the vicinity of the conveyance reference position, and an end portion of the inclined surface 107. And a substantially horizontal flat surface 108 extending to a position close to the pressing roller 106, and the leading edge 101 a of the sheet 101 that has lifted from the conveyance reference position is pushed downward by the inclined surface 107 to the pressing roller 106. invite.

  Although not shown, the cockling imparting mechanism is arranged along the paper conveyance direction at appropriate intervals in the paper width direction orthogonal to the paper conveyance direction so as to contact the lower surface of the paper conveyed toward the processing unit. The extended ribs and the downward projections pressing the upper surface of the paper passing over these ribs between the ribs cause the paper conveyed on the platen surface to bend between the ribs (so-called cock ring). ) To prevent paper floating and wrinkles.

Japanese Patent No. 3507485

  By the way, as shown in FIG. 12, in the guide surface 104 a of the conventional guide member 104, the intersection of the inclined surface 107 and the flat surface 108 becomes a bent portion 109, and the bent portion 109 at the end of the inclined surface 107 is pressed against the bent portion 109. A gap s remains between the roller 106 and the roller 106. Therefore, even if the inclined surface 107 corrects the lifting or curling of the leading edge of the paper 101 downward, the leading edge of the paper 101 cannot be smoothly transferred to the outer periphery of the pressing roller 106 as shown by a broken line in the figure. There is a risk that a paper jam will occur. Sometimes, a paper jam may occur due to the leading edge of the paper being caught within the gap s.

Further, in the conventional paper transport device, as a measure for preventing paper jam in the vicinity of the processing unit, there is only one having only one of a guiding member or a cockling mechanism.
A device equipped with a cockling mechanism can exert an effect of preventing the occurrence of paper jam at the time of paper conveyance on the platen surface. If the paper leading edge is lifted from the transport reference position due to the influence of the above, the lifting of the paper leading edge cannot be eliminated. There is a risk of paper jams, such as being caught on the edge.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper transport apparatus that can more reliably prevent the occurrence of a paper jam when the front end of a paper passes from a processing section to a downstream transport means, thereby realizing stable paper transport. It is in.

  A paper conveying apparatus according to the present invention that can solve the above-described problems is a first conveying means for conveying a sheet from a paper feeding side to a platen surface of a processing unit, and conveys the sheet that has passed through the processing unit to the downstream thereof. And a guide member that guides the leading edge of the paper that has lifted from the conveyance reference position from the processing unit to the second conveyance unit to the conveyance reference position by a guide surface upstream of the second conveyance unit. A paper transport device that is provided at an end and transports paper from the paper feed side to a paper discharge side downstream of the second transport means, wherein the guide surface is set at a position away from the transport reference position by a predetermined distance. It is characterized in that the surface is smoothly continuous from the starting end to the outer periphery of the most upstream roller of the second conveying means.

  According to the paper transport device having the above-described configuration, the upstream end of the second transport unit that transports the paper that has passed through the processing unit while holding the paper downstream of the second transport unit is guided to suppress the lifting of the front end of the paper to the transport reference position side by the guide surface. A member is provided. The guide surface of the guide member is a surface that smoothly continues from the starting end set at a position away from the transport reference position to the outermost roller of the uppermost stream side of the second transport means. The leading edge of the sheet guided by the guide surface is reliably transferred to the most upstream roller of the second conveying means without causing a defective delivery of paper due to a step or a gap between the first conveying means and the second conveying means. Therefore, it is possible to reliably prevent the occurrence of a paper jam due to a defective delivery of the paper to the second transport unit.

  Further, in the paper transport device according to the present invention, the paper fed on the platen surface is subjected to squeezing so that the wavy shape in the paper width direction orthogonal to the transport direction is continuous along the transport direction, It is preferable to provide a cockling imparting mechanism that prevents the sheet from lifting from the platen surface.

According to the paper transport device having such a configuration, the paper transported on the platen surface has an apparent rigidity in the transport direction of the paper that is enhanced by the waveform attached by the cockling imparting mechanism. Linearity is increased, and lifting of the paper from the platen surface is suppressed. For this reason, for example, even when printing processing by ink adhesion is performed in the processing unit, it is possible to suppress irregular wrinkles and undulations on the paper on the platen surface due to ink soaking, etc. It is possible to prevent the sheet from being lifted off from the platen surface, and to prevent processing failure and paper jam due to sheet rubbing in the processing unit.
That is, it is possible to reliably prevent the occurrence of a paper jam during the passage of the processing unit and when the paper is passed through the processing unit and is held by the second conveying means, and the guiding member or cockling can be prevented. Compared with a conventional paper transport device that includes only one of the applying mechanisms, the occurrence frequency of paper jam can be greatly improved.

  In the paper conveying apparatus according to the present invention, the roller on the most upstream side of the second conveying means is disposed upstream of the pinch roller provided in the second conveying means for conveying the paper while pinching it. And a plurality of guide rollers that are intermittently arranged in the paper width direction orthogonal to the paper conveyance direction so as to maintain the valley of the paper attached by the cockling imparting mechanism. It is preferable.

According to the paper conveying apparatus having such a configuration, the leading edge of the paper delivered to the second conveying means is first pressed by the guide roller, and the corrugated shape imparted by the cockling imparting mechanism upstream thereof is applied. The paper conveyance is continued with the appearance of being repeated again.
Therefore, also in the second transport unit, stable transport can be realized in a state where the apparent rigidity of the paper is enhanced by cockling, and stable transport to the paper discharge side can be performed.

According to the paper transport device of the present invention, the guide member of the guide member is provided with a guide member at the upstream end of the second transport unit that sandwiches and transports the paper that has passed through the processing unit downstream. Since the surface is smoothly continuous with the outer periphery of the roller on the most upstream side of the second conveying unit, there is no occurrence of a defective paper delivery due to a step or a gap between the guide surface and the second conveying unit. The leading edge of the sheet guided by the guide surface can be reliably transferred to the most upstream roller of the second conveying means, and it is possible to reliably prevent the occurrence of a paper jam due to defective delivery of the sheet to the second conveying means. it can.
In addition, the paper processing apparatus further includes a cockling imparting mechanism that applies a wrinkle shape in the paper width direction orthogonal to the transport direction to the paper sent on the platen surface of the processing unit so as to continue along the transport direction. It is possible to reliably prevent the occurrence of paper jam during the conveyance of the paper.
Therefore, the occurrence frequency of paper jam can be greatly improved as compared with a conventional paper transport device that has only one of a guide member or a cockling imparting mechanism.

Hereinafter, an example of an embodiment of a paper conveyance device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view of an embodiment of an ink jet printer equipped with a paper conveyance device according to the present invention, and FIG. 2 is a schematic diagram of a paper conveyance path by a conveyance device incorporated in the printer shown in FIG. FIG. 3 is a longitudinal sectional view showing the configuration, FIG. 3 is an enlarged view of the periphery of the processing unit of the transport apparatus shown in FIG. 2, and FIG. 4 is a plan view of the platen and the first transport means shown in FIG. 5 is a view taken in the direction of arrow B in FIG. 4, FIG. 6 is a perspective view of the platen and the first conveying means shown in FIG. 4, and FIG. 7 is a plan view of the second conveying means shown in FIG. 8 is a view as seen from an arrow C in FIG. 7, FIG. 9 is a view as seen from an arrow D in FIG. 7, and FIG. 10 is an enlarged view of a portion E in FIG.

The printer 1 according to the present embodiment is a front-feed / discharge-type business-use inkjet printer, and as shown in FIG. 1, the center of the front surface of an apparatus case 4 composed of a lower case 2 and an upper case 3. In addition, a substantially box-shaped paper cassette 5 loaded with a paper to be conveyed is detachably inserted.
Further, a paper discharge tray 6 for receiving the printed paper is provided so as to cover the open top portion of the paper cassette 5. Further, on both sides of the front surface of the device case 4, a display unit 7 and an operation unit 8 for displaying an operation state are provided.

  In the apparatus case 4, as shown in FIG. 2, there is provided a paper transport device 11 that forms an arc-shaped transport path A and a first linear transport path B connected from the arc-shaped transport path A to the paper discharge tray 6. The paper cassette 5, the arc-shaped transport path A, the first linear transport path B, and the paper discharge tray 6 process the paper P fed out from the paper discharge tray 6 and then return it to the front paper discharge tray 6. A character-shaped conveyance path is formed.

The paper transport device 11 includes an ASF (auto sheet feeder) unit and a PF (paper feeder) unit.
The ASF unit feeds paper P accommodated in the paper cassette 5 one by one to the rear of the apparatus, and a circle that feeds the paper P fed by the paper feed mechanism 22 along an arc-shaped transport path. It is comprised from the intermediate | middle roller 31 and the guide part 34 etc. which form an arc-shaped conveyance part.
As shown in FIG. 3, the PF unit sandwiches the paper P conveyed from the arcuate conveyance unit and sends it onto the platen surface 51 of the print processing unit 43, and the first conveyance unit 40. The cockling imparting mechanism 53 for imparting a corrugated shape to the paper P sent onto the platen surface 51 by the second, and the paper P that has passed the print processing unit 43 is sandwiched between the paper discharge tray 6 downstream thereof and conveyed. The conveying means 55 and a guiding member 57 formed continuously at the upstream end of the second conveying means 55 are configured.

  As shown in FIG. 2, the sheet feeding mechanism 22 of the ASF unit is configured such that the rear end of a frame 25 having a pickup roller 21 for feeding at the front end can be rotated in the vertical direction in the figure by a support pin 24. Yes. The sheet feeding mechanism 22 can bring the pickup roller 21 into contact with the uppermost sheet P in the sheet P cassette 5 by swinging the frame 25 in the vertical direction. In the paper feeding mechanism 22, when the printer 1 is at rest, the frame 25 is maintained horizontally as indicated by a solid line in FIG. 2, and the pickup roller 21 is kept away from the paper P on the paper P cassette 5. At the time of paper feeding, the pickup roller 21 is pressed against the paper P on the paper P cassette 5 as indicated by a two-dot chain line in FIG. As the pickup roller 21 rotates, the paper P on the paper P cassette 5 comes into contact with the inclined friction pad 23 and is separated by the frictional force and the strength of the paper P while being separated one by one from the intermediate roller 31 and the guide portion 34. It is paid out during. When printing is started by the print processing unit 43 after the paper feeding is completed, the frame 25 is returned to the original horizontal state as shown by the solid line in FIG.

  As illustrated in FIG. 2, the arcuate conveyance path A includes a guide portion 34 that is provided outside the arcuate conveyance path A (on the back side of the printer 1) and has a guide surface that is curved in a substantially arcuate shape. An intermediate roller 31 that is provided on the inner side of A (the front side of the printer 1) and feeds the paper P from the lower side to the upper side of the guide portion 34 is provided. The guide portion 34 is provided with a retard roller 32 provided on the lower side and an assist roller 33 arranged on the upper side. The paper P sent out by the pickup roller 21 is nipped and conveyed by the intermediate roller 31 and the retard roller 32, and further nipped and conveyed by the intermediate roller 31 and the assist roller 33. As a result, the paper P is transported along an arc-shaped transport path A formed as a gap between the intermediate roller 31 and the guide section 34, and its leading end is directed to the front side of the printer to form a U-shaped transport path. To the first linear transport path B.

  Further, an auxiliary guide member 35 is provided above the intermediate roller 31. The auxiliary guide member 35 is rotatably supported at the rear end side with respect to the guide portion 34, and the front end side is swung. The auxiliary guide member 35 presses the sheet P conveyed from the arcuate conveyance path A to the first linear conveyance path B by its own weight from the upper side, and the sheet P is moved along the first linear conveyance path B. Guide to the front side of the printer 1.

  As shown in FIG. 2, the first conveying unit 40 of the PF unit is configured by a pair of paper feed rollers 41 and 42. The pair of paper feed rollers 41 and 42 is provided at a position a predetermined distance away from the exit end of the arcuate conveyance path A (downstream end of the guide portion 34) on the front side of the apparatus. The paper P that has been sent to the linear path (first linear transport path B) is nipped and transported under the print processing unit 43 that is the printing position. The paper P can be positioned with respect to the print processing unit 43 by controlling the rotational drive amount.

  The print processing unit 43 as a processing unit includes a carriage 45 having a print head 44, and the carriage 45 is supported so as to be movable in the width direction with respect to the fed paper P.

  As shown in FIG. 2, the print head 44 has a discharge nozzle 46 that discharges ink droplets toward the paper P. The print P 44 has a paper P on the front side of the printer 1 with respect to the discharge nozzle 46. And a PW sensor 47 for detecting the width thereof. The PW sensor 47 detects the presence or absence of the paper P by detecting the reflected light of the light emitted toward the paper P, and detects the width of the paper P by the movement of the carriage 45.

  As shown in FIGS. 4 to 6, the cockling imparting mechanism 53 includes a plurality of ribs 63 (eight in the drawing) that are formed on the substrate 61 as a platen and whose upper surface constitutes the platen surface 51. The auxiliary rib 65 is formed with a protruding height lower than that of the rib 63 and a paper guide auxiliary 67 for pressing the paper P against the platen surface 51.

  The ribs 63 extend along the transport direction of the paper P, and are provided at regular intervals in the width direction of the paper P, respectively. The interval L between the ribs 63 is set such that the platen surface 51 that can stably support the paper P can be secured even if the size of the paper P to be processed changes. In the present embodiment, the interval L between the ribs 63 is set to about 27 mm. When the paper P to be processed is A4 size, the eight ribs 63 support the back surface of the paper and the paper P to be processed. In the case of a postcard size, the three ribs 63 can support the back side of the paper.

  In the present embodiment, two auxiliary ribs 65 are provided between the ribs 63, and the height thereof is about 0.3 mm lower than the ribs 63. The auxiliary rib 65 prevents the paper P from being bent excessively by supporting the back surface of the valley of the paper P when the paper P is bent between the ribs 63 to form a corrugated valley.

As shown in FIG. 3, the paper guide assist 67 is attached to the tip of a holder 71 disposed above the paper transport path by the first transport means 40.
Since the paper guide assistant 67 needs to change the pressing width in accordance with the paper size (paper width), in this embodiment, as shown in FIGS. 4 to 6, the paper guide auxiliary 67 is divided into four in the paper width direction. And each is configured to move independently.
As shown in FIG. 6, each paper guide assist 67 includes a first presser portion 67 a for pressing the paper P against each platen surface 51 and a protrusion 67 b protruding between the adjacent ribs 63 and 63. It is configured to be arranged alternately in the width direction.
The protrusion 67b deflects the paper P between the ribs 63 and 63, and causes the paper P to have a corrugated valley.

  The sheet P passes between the substrate 61 as a platen on which the ribs 63 and the auxiliary ribs 65 are formed and the paper guide auxiliary 67 on which the first pressing portions 67a and the protrusions 67b are formed, so that the sheet P is placed on the platen surface 51. The transported paper P is creased by peaks and troughs so that the corrugated shape in the paper width direction perpendicular to the transport direction continues along the transport direction. This corrugated shape enhances the apparent rigidity in the conveyance direction of the paper P, increases the linearity in the conveyance direction, and suppresses the lifting of the paper P from the platen surface 51.

  As shown in FIGS. 2 and 3, the second transporting unit 55 has three rows of guide rollers 75, 76, 77 that press the upper surface of the paper P that has passed through the print processing unit 43 to a transport reference position 73 having a predetermined height. In addition, two rows of pinch rollers 78 and 79 that sandwich and convey the paper P in cooperation with the guide rollers 76 and 77, and a first roller frame that supports the guide rollers 75, 76, and 77 in a predetermined positional relationship. 81 and a second roller frame (not shown) that supports the two rows of pinch rollers 78 and 79.

  As shown in FIGS. 7 and 8, the three rows of guide rollers 75, 76, and 77 are intermittently arranged at predetermined intervals along the paper transport direction X, respectively. These guide rollers 75, 76, 77 are so-called serrated rollers provided with protrusions at regular intervals in the circumferential direction, and are rotatably supported by the first roller frame 81. Further, the guide rollers 75, 76, 77 are supported by a coil spring-like shaft, and are appropriately elastically displaced in a direction orthogonal to the rotation axis when the paper P is pressed, so that the position and contact pressure with respect to the paper are appropriately adjusted. It has become so. Further, as shown in FIGS. 9 and 10, the guide roller 75 positioned on the most upstream side is arranged at the same interval as the protrusion 67 b of the paper guide assist 67 along the paper width direction, thereby providing a cockling imparting mechanism. The corrugated valley portion 53 formed on the paper P is pressed from the upper surface to maintain the corrugated shape.

The two rows of pinch rollers 78 and 79 are arranged corresponding to the two downstream rows of guide rollers 76 and 77 excluding the most upstream guide roller 75, and cooperate with these guide rollers 76 and 77. The paper P is nipped and conveyed by operation.
As described above, the most upstream guide roller 75 is provided on the upstream side of the pinch rollers 78 and 79 provided to sandwich and convey the paper P, and the two rows of pinch rollers 78 and 79 and 2 are arranged. Before the sheet P is sandwiched between the guide rollers 76 and 77 in the row, the upper surface of the sheet is pressed so as to maintain the valley portion of the sheet P attached by the cockling imparting mechanism 53. Therefore, the second transport means 55 can transport the paper P downstream while pinching the paper P while the cockling of the paper P is maintained by the most upstream guide roller 75.

  As shown in FIG. 3, the upstream pinch roller 78 of the two rows of pinch rollers 78 and 79 is supported by a support frame 83 provided continuously on the substrate 61 that provides the platen surface 51. Yes. The upper surface of the support frame 83 is set so as to be flush with the platen surface 51. Similarly to the case of the substrate 61 as the platen, the rib 63 and the auxiliary rib for attaching the paper P to the corrugated shape. 65 is raised.

As shown in FIG. 8, the guide member 57 causes the leading end 85 of the paper P that has passed through the print processing unit 43 and lifted from the conveyance reference position 73 from the print processing unit 43 to the second conveyance unit 55 to be guided by the guide surface 87. Guide to the transport reference position 73.
The guide surface 87 of the present embodiment is close to the outer periphery of the guide roller 75 that is the most upstream roller of the second transport means 55 from the start end 87a set at a position separated from the transport reference position 73 by a predetermined distance d1. A convex curved surface is formed that is smoothly continuous up to the end 87b, and that the vicinity of the end 87b is smoothly connected to the outer periphery of the adjacent guide roller 75. The guide surface 87 is not limited to a curved surface and may be a flat inclined surface.

  According to the paper transport device 11 of the present embodiment described above, the upstream end of the second transport means 55 that sandwiches and transports the paper P that has passed through the print processing unit 43 to the downstream thereof is located at the leading end of the paper P. A guide member 57 that suppresses the lifting to the conveyance reference position 73 side by the guide surface 87 is provided. Since the vicinity of the end 87b of the guide surface 87 of the guide member 57 is formed on a surface that is smoothly continuous with the outer periphery of the guide roller 75 on the most upstream side of the second transport means 55, the guide surface 87 and the second transport The leading edge of the paper P is not caught due to a step or a gap between the means 55 and a delivery failure does not occur. Therefore, as indicated by a broken line in FIG. 8, the leading edge of the paper P pressed by the guide surface 87 can be reliably transferred to the guide roller 75 on the most upstream side of the second transport unit 55, and the second transport unit 55. It is possible to reliably prevent the occurrence of a paper jam due to a defective delivery of the paper P to the paper.

Further, in the paper transport apparatus 11 of the present embodiment, the paper P transported onto the platen surface 51 by the first transport means 40 has an apparent appearance of the paper P due to the waveform attached by the cockling imparting mechanism 53. The rigidity is enhanced and the lifting of the paper P from the platen surface 51 is suppressed.
Therefore, for example, even when a printing process is performed by ejecting ink droplets in the printing processing unit 43, it is possible to suppress irregular wrinkles and undulations on the paper P on the platen surface 51 due to ink soaking, It is possible to prevent the paper P from being lifted from the platen surface 51 due to the occurrence of the wrinkles and undulations, and to prevent the printing processing unit 43 from causing printing defects and paper jams due to rubbing between the print head 44 and the paper P. it can.
That is, it is possible to reliably prevent the occurrence of paper jams when the paper P passes through the print processing unit 43 and when the paper P passes through the print processing unit 43 and is transported while being sandwiched between the second transport means 55. As compared with a conventional paper transport device that has only one of a guiding member or a cockling imparting mechanism, the occurrence frequency of paper jam can be greatly improved.

Further, in the paper transport device 11 of the present embodiment, the leading edge of the paper P delivered to the second transport means 55 is first pressed by the guide roller 75 and is applied by the cockling imparting mechanism 53 upstream thereof. The conveyance of the paper P is continued in a state where the wavy shape is repeatedly repeated.
Therefore, the second transport means 55 can also realize stable transport with the cockling applied to the paper P, and can realize stable transport to the paper discharge side.

  The apparatus on which the paper conveying device according to the present invention is mounted is not limited to the ink jet printer shown in the above embodiment. The paper transport device of the present invention can be incorporated into various devices such as a copying machine, a facsimile machine, and a money changer having a paper transport path as a paper transport device excellent in preventing paper jam.

1 is an external perspective view of an embodiment of an ink jet printer equipped with a paper conveying device according to the present invention. FIG. 2 is a longitudinal sectional view illustrating a schematic configuration of a sheet conveyance path by a conveyance device incorporated in the printer illustrated in FIG. 1. FIG. 3 is an enlarged view of a periphery of a processing unit of the transport device illustrated in FIG. 2. FIG. 4 is a plan view of the platen and first transport means shown in FIG. 3. It is a B arrow view of FIG. FIG. 5 is a perspective view of the platen and first transport means shown in FIG. 4. It is a top view of the 2nd conveyance means shown in FIG. It is C arrow line view of FIG. It is a D arrow line view of FIG. It is an enlarged view of the E section of FIG. It is a top view of the conveyance means with which the downstream of the process part of the conventional paper conveying apparatus was equipped. It is A arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer 11 Paper conveying apparatus 40 1st conveying means 43 Print processing part (processing part)
44 Print head 45 Carriage 51 Platen surface 53 Cock ring imparting mechanism 55 Second conveying means 57 Guide member 61 Substrate as platen 63 Rib 65 Auxiliary rib 67 Paper guide auxiliary 67a First pressing portion 67b Protrusion 73 Conveyance reference position 75, 76, 77 Guide roller 78, 79 Pinch roller 85 Paper tip 87 Guide surface P Paper

Claims (3)

A first transport unit that feeds the paper from the paper feed side onto the platen surface of the processing unit; and a second transport unit that transports the paper that has passed through the processing unit to the downstream side of the first transport unit. A guiding member that guides the leading edge of the sheet that has floated from the conveyance reference position to the conveyance reference position by a guide surface is provided at the upstream end of the second conveyance unit, and from the paper supply side to the downstream of the second conveyance unit A paper transport device for transporting paper to the paper discharge side of the paper,
The paper is characterized in that the guide surface is a surface that smoothly continues from the starting end set at a predetermined distance from the transport reference position to the outermost roller of the uppermost stream side of the second transport means. Conveying device. The paper transport device according to claim 1,
The paper fed on the platen surface is restrained so that the wavy shape in the paper width direction orthogonal to the transport direction continues along the transport direction, thereby preventing the paper from lifting from the platen surface. A paper conveying device comprising a cockling imparting mechanism. It is a paper conveying apparatus of Claim 1 or 2, Comprising:
The roller on the most upstream side of the second conveying unit is disposed upstream of the pinch roller provided in the second conveying unit to convey the sheet while pinching the sheet, and presses the upper surface of the sheet to the conveyance reference position. A paper conveying device, characterized in that a plurality of guide rollers are intermittently arranged in the paper width direction perpendicular to the paper conveying direction so as to maintain the valley of the paper attached by the cockling imparting mechanism.

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