JP2021130205A - Printing device - Google Patents

Abstract

To provide a printing device that can keep wrinkles of printing medium in a smoothed state, so as to improve accuracy of a printing position.SOLUTION: The printing device comprises: a conveying part 21 that conveys a printing medium W; printing parts 22A and 22B which apply printing processing to the printing medium W being conveyed by the conveying part 21; and wrinkle-smoothing rollers 34 and 36, provided on an upstream side of the printing parts 22A and 22B, which smooth wrinkles generated in the printing medium W being conveyed by the conveying part 21. The conveying part 21 has a support roller 41b that supports the printing medium W and a high friction roller 41a, provided on a downstream side of the wrinkle-smoothing rollers 34 and 36, which is higher in friction force than the support roller 41b.SELECTED DRAWING: Figure 1

Description

The present invention relates to a printing apparatus that performs a printing process on a printing medium while smoothing out wrinkles on the printing medium.

Conventionally, a printing apparatus has been proposed in which a printing medium made of long paper or a film is conveyed by a roller and a printing process is performed on the printing medium.

As such a printing device, for example, an inkjet printing device having an inkjet head has been proposed. In this inkjet printing device, a roll in which a printing medium extending over several meters to several kilometers is wound in a roll shape is installed in a transmission unit, and the printing medium sent out from the roll is conveyed by a roller or the like and is carried under the inkjet head. Printing is performed by passing through. Then, after printing, the winding portion on the downstream side is configured to wind up in a roll shape.

Here, in the inkjet printing apparatus as described above, if the printing medium conveyed directly under the inkjet head has wrinkles, the ink landing position is deviated, which leads to deterioration of image quality. In particular, since the print medium is conveyed while applying a predetermined tension between the side that sends out the print medium and the side that winds it up, as shown in FIG. 9, a compressive force acts in a direction orthogonal to the transfer direction of the print medium. , Wrinkles are likely to occur along the direction extending in the transport direction. Therefore, it is necessary to remove the wrinkles of the print medium conveyed directly under the inkjet head.

Patent Document 1 proposes a method of smoothing wrinkles by providing rollers inclined in a direction of opening each other with respect to the transport direction of the print medium at both ends extending in the transport direction of the print medium.

Japanese Unexamined Patent Publication No. 4-223135

However, in the method described in Patent Document 1, the wrinkles are in a stretched state immediately after the print medium has passed through the roller which is the wrinkle smoothing mechanism, but wrinkles occur again when the transport distance from the roller becomes long. ..

Further, when a plurality of head units are arranged along the transport path of the print medium, installing the rollers for each head unit leads to an increase in cost and an increase in size of the entire device, which is not desirable.

In view of the above circumstances, it is an object of the present invention to provide a printing apparatus capable of maintaining a state in which wrinkles of a printing medium are smoothed and thereby improving printing position accuracy.

The printing apparatus of the present invention is provided on the upstream side of the printing unit, the transport unit that conveys the print medium, the printing unit that performs the printing process on the print medium conveyed by the transport unit, and is conveyed by the transport unit. A wrinkle smoothing mechanism for smoothing wrinkles generated in the printing medium is provided, and a transport portion is provided on a support roller for supporting the print medium and a downstream side of the wrinkle smoothing mechanism, and has a higher frictional force than the support roller. Has a roller.

According to the printing apparatus of the present invention, a high-friction roller is provided with a wrinkle-stretching mechanism for smoothing wrinkles generated in a printing medium, and a transport portion is provided on the downstream side of the wrinkle-stretching mechanism and has a higher frictional force than a support roller. Therefore, it is possible to prevent the wrinkles once stretched by the wrinkle smoothing mechanism from returning to their original state by the high friction roller. That is, since the state in which the wrinkles of the print medium are smoothed can be maintained, the print position accuracy can be improved.

The figure which shows the schematic structure of the inkjet printing apparatus using one Embodiment of the printing apparatus of this invention. The figure which shows an example of the wrinkle smoothing roller Diagram showing other examples of wrinkle smoothing rollers Explanatory drawing for explaining the action of a high friction roller Enlarged view of the vicinity of friction rollers, high friction rollers and support rollers A diagram showing an example of a table in which the type of print medium and the presence / absence of movement of the friction roller are associated with each other. A block diagram showing a configuration of a control system of the inkjet printing apparatus shown in FIG. A flowchart for explaining the printing operation of the inkjet printing apparatus shown in FIG. Explanatory drawing for explaining the principle of wrinkle generation of a print medium

Hereinafter, an inkjet printing apparatus using an embodiment of the printing apparatus of the present invention will be described in detail with reference to the drawings. The inkjet printing apparatus of the present embodiment is configured so that printing can be performed on a long printing medium, and is characterized in a configuration of smoothing wrinkles generated on the long printing medium. However, first, a schematic configuration of the entire inkjet printing apparatus will be described. FIG. 1 is a schematic configuration diagram of the inkjet printing apparatus 1 of the present embodiment. The vertical and horizontal directions indicated by the arrows in FIG. 1 are the vertical and horizontal directions in the inkjet printing apparatus 1 of the present embodiment, the direction orthogonal to the paper surface of FIG. 1 is the front-rear direction, and the paper surface front direction is the front direction.

As shown in FIG. 1, the inkjet printing device 1 of the present embodiment includes a sending section 2, a printing device main body section 3, and a winding section 4. In the following description, upstream and downstream mean upstream and downstream in the transport direction of the print medium W transported from the transmission unit 2 to the winding unit 4.

The delivery unit 2 sends out the print medium W from the roll 10 in which the long print medium W made of a film, paper, or the like is wound in a roll shape. The delivery unit 2 includes a roll support shaft 11 that rotatably supports the roll 10, a brake 12 (see FIG. 7) that applies a brake to the roll support shaft 11, and a transmission control unit 13 that controls the delivery unit 2. I have.

The brake 12 applies a brake to the roll support shaft 11. The brake by the brake 12 applies tension to the printing medium W between the roll 10 and the transfer roller 43 of the printing apparatus main body 3 which will be described later.

The transmission control unit 13 controls the brake 12 based on the tension set value according to the type of the print medium W, which will be described later. By this brake control, tension is generated for the print medium W according to the tension set value. The transmission control unit 13 includes a CPU (Central Processing Unit), a semiconductor memory, a hard disk, and the like.

The printing apparatus main body 3 performs a printing process on the printing medium W while conveying the printing medium W sent out from the sending unit 2. The printing apparatus main body 3 includes a conveying section 21, printing sections 22A and 22B, an operation panel 23, and a printing control section 24.

The transport unit 21 transports the print medium W sent out from the transmission unit 2. The transport unit 21 includes guide rollers 31 to 33, 35, 37 to 40, wrinkle smoothing rollers 34, 36, 10 sets of under-head roller sets 41, meander control unit 42, a pair of transport rollers 43, and friction. It includes a roller 44, a roller moving mechanism 45 (see FIG. 7), which will be described later, and a transfer motor 46 (see FIG. 7).

The guide rollers 31 to 33, 35, 37 to 40 guide the printing medium W conveyed in the printing apparatus main body 3. The guide roller 31 is arranged at the lower part of the left end portion of the printing apparatus main body 3. The guide roller 32 is arranged between the guide roller 31 and the meandering control roller 42a of the meandering control unit 42 described later.

The guide rollers 33, 35, 37 to 40 guide the print medium W between the meandering control unit 42 and the transport roller 43. The guide roller 33 is arranged slightly above the meandering control roller 42b of the meandering control unit 42, which will be described later, in the left direction.

The guide roller 35 has the same height as the wrinkle smoothing roller 34 and is arranged on the right side of the wrinkle smoothing roller 34. The guide roller 37 is located on the left side of the guide roller 36, near the right side of the print medium W between the guide rollers 33 and 34, and at substantially the same height as the guide roller 36. The guide roller 38 is arranged on the lower right side of the guide roller 37. The guide roller 39 is arranged below the guide roller 38 on the slightly right side.

The guide roller 40 guides the print medium W between the transport roller 43 and the take-up unit 4. The guide roller 40 is arranged at the lower part of the right end portion of the printing apparatus main body 3.

The wrinkle smoothing rollers 34 and 36 are rollers for smoothing wrinkles generated in the print medium W transported by the transport unit 21. Specifically, as shown in FIG. 2, the wrinkle smoothing rollers 34 and 36 are rollers for smoothing the wrinkles of the print medium W by applying tension in the width direction of the print medium W. As the wrinkle smoothing rollers 34 and 36, for example, concave rollers (concave rollers) called inverted crown-shaped rollers or drum-shaped rollers can be used. However, the wrinkle smoothing rollers 34 and 36 are not limited to the concave rollers, and for example, as shown in FIG. 3, a groove G that expands toward the transport direction of the print medium W is formed on the cylindrical roller. Rollers may be used. The groove G has a function of applying tension in the width direction of the print medium W as well as conveying the print medium W by coming into contact with the print medium W.

In the present embodiment, the wrinkle smoothing rollers 34 and 36 correspond to the wrinkle smoothing mechanism of the present invention, but the structure of the wrinkle smoothing mechanism is not limited to the rollers as described above, and any other structure is used. May be used.

The wrinkle smoothing roller 34 is located above the guide roller 33 and is arranged on the transport path of the print medium W between the guide roller 33 and the printing unit 22A. Further, the wrinkle smoothing roller 34 is arranged near the upstream side of the printing unit 22A that performs the printing process on the surface of the printing medium W. As a result, the print medium W in which the wrinkles are once smoothed by the wrinkle smoothing roller 34 can be sent below the printing unit 22A.

The wrinkle smoothing roller 36 is located below the guide roller 35 and higher than the guide roller 33. Further, the wrinkle smoothing roller 36 is arranged in the vicinity of the upstream side of the printing unit 22B on the transport path of the printing medium W between the printing unit 22A and the printing unit 22B that performs the printing process on the back surface of the printing medium W. ing. As a result, the print medium W in which the wrinkles are once smoothed by the wrinkle smoothing roller 36 can be sent below the printing unit 22B.

The under-head roller set 41 is provided for each of the head units 51, which will be described later, which constitute the printing unit 22A and the printing unit 22B. In this specification, when the head units 51K, 51C, 51M, 51Y, and 51P, which will be described later, are collectively referred to, the subscripts of the alphabet in the reference numerals are omitted.

The lower head roller set 41 supports the print medium W below each head unit 51 between the wrinkle smoothing roller 34 and the guide roller 35 and between the wrinkle smoothing roller 36 and the guide roller 37.

The under-head roller assembly 41 of the present embodiment includes a high friction roller 41a and a support roller 41b. The high friction roller 41a and the support roller 41b are elongated rollers extending in the front-rear direction. The high friction roller 41a provided below the printing portion 22A is provided on the downstream side of the wrinkle smoothing roller 34 and has a higher frictional force against the printing medium W than the supporting roller 41b. By arranging the high-friction roller 41a on the downstream side of the wrinkle-stretching roller 34 in this way, it is possible to prevent the wrinkles stretched by the wrinkle-stretching roller 34 from returning to their original state, and the wrinkles are stretched. Can be maintained. Specifically, as shown in FIG. 4, the high friction roller 41a generates a frictional force in the opposite direction to the compressive force generated in the direction orthogonal to the conveying direction of the print medium. As a result, it is possible to prevent the wrinkles once stretched from returning to their original state. Note that FIG. 4 is a view of the conveyed print medium W as viewed from above. Therefore, since the print medium W in a state in which no wrinkles are generated can be conveyed below the head unit 51, it is possible to prevent deterioration of image quality due to landing deviation due to wrinkles.

Further, the high friction roller 41a of the lower head roller group 41 provided below the printing portion 22B is provided on the downstream side of the wrinkle smoothing roller 36 and has a higher frictional force against the printing medium W than the support roller 41b. be. By arranging the high-friction roller 41a on the downstream side of the wrinkle-stretching roller 36 in this way, it is possible to prevent the wrinkles stretched by the wrinkle-stretching roller 36 from returning to their original state, and the wrinkles are stretched. Can be maintained. As a result, the print medium W in a state in which no wrinkles are generated can be conveyed below the head unit 51, so that it is possible to prevent deterioration of image quality due to landing deviation due to wrinkles.

As the high friction roller 41a and the support roller 41b, for example, the support roller 41b may be composed of a metal roller, and the high friction roller 41a may be composed of a rubber roller or a ceramic coating roller.

Further, the high friction roller 41a is provided on the upstream side of the support roller 41b, and each head unit 51 ejects ink to the printing medium W conveyed between the high friction roller 41a and the support roller 41b. And print it. As a result, the printing process can be performed on the print medium W in a state in which the wrinkles are stretched more reliably without bending.

The meandering control unit 42 corrects the meandering of the print medium W. The meandering control unit 42 includes meandering control rollers 42a and 42b, a meandering control motor 42c (see FIG. 7) described later, and an edge sensor 42d.

The meandering control rollers 42a and 42b are rotated around a rotation axis parallel to the left-right direction by the meandering control motor 42c.

The edge sensor 42d detects the edge of the print medium W in the width direction (front-back direction). The edge sensor 42d is arranged near the downstream side of the meandering control roller 42b.

The pair of transfer rollers 43 convey the print medium W toward the take-up unit 4 while niping the print medium W. The transport roller 43 is formed in a long shape extending in the front-rear direction. The transport roller 43 is arranged between the guide rollers 39 and 40. The transfer motor 46 (see FIG. 7) rotationally drives the transfer roller 43.

The friction roller 44 is a roller arranged in the vicinity of the upstream of each head unit 51. The friction roller 44 is moved in the vertical direction by the roller moving mechanism 45. The downward movement of the friction roller 44 increases the holding angle of the print medium W in the high friction roller 41a, which increases the frictional force between the high friction roller 41a and the print medium W. The roller moving mechanism 45 includes an actuator for moving the friction roller 44.

FIG. 5 is an enlarged view of the vicinity of the friction roller 44, the high friction roller 41a, and the support roller 41b. As shown in FIG. 5, as the friction roller 44 moves downward, the holding angle of the printing medium W in the high friction roller 41a increases, whereby the frictional force between the high friction roller 41a and the printing medium W is increased. Can be made larger.

For example, when the print medium W is thin paper, the above-mentioned tension setting value is set low in order to prevent breakage. When the tension of the print medium W is low as described above, the frictional force between the print medium W and the high friction roller 41a cannot be maintained, and it is difficult to maintain the wrinkled state of the print medium W. Therefore, in the present embodiment, as described above, the friction roller 44 is moved downward to increase the frictional force between the high friction roller 41a and the printing medium W, so that the wrinkles of the printing medium W are smoothed. Can be maintained.

The distance between the friction roller 44 and the high friction roller 41a is set to a distance at which the holding angle of the print medium W on the high friction roller 41a can be changed by moving the friction roller 44 downward.

The printing unit 22A prints an image of each page on the surface of the printing medium W. The printing unit 22A is arranged near the upper side of the printing medium W between the wrinkle smoothing roller 34 and the guide roller 35. The printing unit 22A includes head units 51K, 51C, 51M, 51Y, and 51P arranged in parallel in the transport direction of the printing medium W.

The head units 51K, 51C, 51M, 51Y, and 51P are arranged side by side in this order from the upstream side in the left-right direction. The head units 51K, 51C, 51M, 51Y, and 51P each include an inkjet head. Each inkjet head has a plurality of nozzles arranged along a direction (front-back direction) orthogonal to the transport direction of the print medium W, and print processing is performed by ejecting ink from the nozzles to the print medium W. Each inkjet head of the head units 51K, 51C, 51M, 51Y, and 51P ejects black (K), cyan (C), magenta (M), yellow (Y), and preliminary ink colors, respectively. As the preliminary ink color, red, light cyan, or the like is used.

The printing unit 22B prints an image of each page on the back surface on the back surface of the printing medium W. The printing unit 22B is arranged near the upper side of the printing medium W between the wrinkle smoothing roller 36 and the guide roller 37. Similar to the printing unit 22A, the printing unit 22B includes head units 51K, 51C, 51M, 51Y, and 51P arranged in parallel in the transport direction of the printing medium W.

The operation panel 23 displays various screens and accepts various setting inputs by the user. In particular, the operation panel 23 of the present embodiment accepts input of the type of print medium W. The operation panel 23 includes a display unit having a liquid crystal display panel and the like, and an input unit having various operation keys and a touch panel and the like.

The print control unit 24 controls each unit of the printing device main body unit 3. The print control unit 24 includes a CPU (Central Processing Unit), a semiconductor memory, a hard disk, and the like.

When performing the printing process, the print control unit 24 controls the printing units 22A and 22B to perform the printing process on the printing medium W while rotating the transport roller 43 by the transport motor 46 to transport the print medium W. That is, the print control unit 24 prints an image at a desired position on the print medium W by controlling the ink ejection timing according to the amount of the print medium W conveyed.

Further, the print control unit 24 controls the roller moving mechanism 45 to move the friction roller 44 according to the type of the print medium W. Specifically, the print control unit 24 is set with a table as shown in FIG. 6 in which the type of the print medium W and the presence / absence of movement of the friction roller 44 are associated with each other. The tension set value shown in the table of FIG. 6 is output from the print control unit 24 to the transmission control unit 13, and the transmission control unit 13 performs the above-mentioned brake control based on the input tension set value. The tension set value is set to a size corresponding to the type of the print medium W. Further, in the present embodiment, three types of print medium W are set: thick paper, plain paper, and thin paper.

Then, when the type of the print medium W is thick paper, the print control unit 24 sets the tension setting value to a value larger than that of the thin paper. In this case, the print control unit 24 ensures that the frictional force between the high friction roller 41a and the print medium W is secured, so that the friction roller 44 does not move. Further, the print control unit 24 sets the tension setting value to a value larger than that of the thin paper even when the type of the print medium W is plain paper. As in the case of thick paper, the print control unit 24 ensures that the frictional force between the high friction roller 41a and the print medium W is secured, so that the friction roller 44 does not move.

On the other hand, when the type of the print medium W is thin paper, the print control unit 24 sets the tension setting value to a value smaller than that of thick paper and plain paper. Then, in this case, the print control unit 24 cannot secure the frictional force between the high friction roller 41a and the print medium W, so that the friction roller 44 is moved by a predetermined amount of movement. It is assumed that the amount of movement of the friction roller 44 is preset according to the tension set value in the case of thin paper.

As described above, even in the case of thin paper having a small tension set value, the holding angle of the printing medium W in the high friction roller 41a can be increased by moving the friction roller 44, so that the holding angle between the high friction roller 41a and the printing medium W can be increased. The frictional force can be increased, and the wrinkled state of the print medium W can be maintained. Thereby, the accuracy of the landing position of the ink with respect to the print medium W can be improved. If the friction roller 44 is moved even when the print medium W is thick paper, for example, the thick paper may be wound, the print medium W may come into contact with the head unit 51, or the quality of the printed matter may be deteriorated. However, in the present embodiment, when the print medium W is thick paper, the friction roller 44 is not moved, so that the above-mentioned problem can be avoided.

Further, in the present embodiment, the friction roller 44 is not moved in the case of plain paper, but the present invention is not limited to this, and the friction roller 44 is also moved in the case of plain paper as needed. May be good. In this case, the amount of movement of the friction roller 44 is set so that the holding angle is larger in the case of thin paper than in the case of plain paper.

The take-up unit 4 winds up the printed print medium W. The take-up unit 4 includes a take-up shaft 61, a take-up motor 62 (see FIG. 7) described later, and a take-up control unit 63.

The take-up shaft 61 is rotated clockwise in FIG. 1 by the take-up motor 62. By the rotation of the take-up shaft 61, the printed print medium W is taken up by the take-up shaft 61. The take-up shaft 61 holds the wound printed print medium W as the printed roll 60.

The take-up control unit 63 controls the drive of the take-up motor 62. The take-up control unit 63 includes a CPU (Central Processing Unit), a semiconductor memory, a hard disk, and the like.

FIG. 7 is a block diagram showing a control system of the inkjet printing apparatus 1 of the present embodiment. The print control unit 24 controls each unit shown in FIG. 7 by executing a program stored in advance in a storage medium such as a semiconductor memory or a hard disk and operating an electric circuit.

Next, the printing operation of the inkjet printing apparatus 1 of the present embodiment will be described with reference to the flowchart shown in FIG.

First, the user sets and inputs the type of the print medium W on the operation panel 23, and the print control unit 24 acquires the type of the print medium W (S10).

The print control unit 24 refers to the above-mentioned table based on the acquired type of print medium W, and acquires the movement amount of the friction roller 44 (S12). Then, the print control unit 24 controls the roller moving mechanism 45 based on the acquired movement amount to move the friction roller 44 (S14).

Next, the print control unit 24 starts driving the transport motor 46, and the take-up control unit 63 starts driving the take-up motor 62. As a result, the printing medium W is started to be conveyed from the sending unit 2 to the winding unit 4 (S16).

Then, when the transport speed of the print medium W reaches a predetermined transport speed, the transmission control unit 14 starts driving the brake 12. When the roll support shaft 11 is braked by the brake 12, tension is applied to the print medium W between the roll 10 and the transport roller 43 according to the type of the print medium W (S18). Further, the print control unit 24 controls the transport motor 46 so as to maintain the print transport speed after the transport speed of the print medium W reaches the print transport speed.

Then, in the printing apparatus main body 3, the meandering control unit 42 corrects the meandering of the printing medium W while the printing medium W is being conveyed (S20). Specifically, the print control unit 24 controls the meandering control motor 42c so as to maintain the position of the edge in the width direction of the print medium W detected by the edge sensor 42d at a predetermined position, whereby the meandering control roller 42a, Adjust the angle of 42b.

Next, the printing medium W in a state in which the wrinkles are smoothed by the wrinkle smoothing roller 34 is conveyed toward the lower side of the printing unit 22A (S22), and the state is changed by the high friction roller 41a provided below the printing unit 22A. It is maintained (S24).

Then, the print control unit 24 controls each head unit 51 of the print unit 22A to perform a print process on the surface of the print medium W (S26).

After printing by the printing unit 22A, the printing medium W is further conveyed toward the printing unit 22B. Then, the printing medium W in the state where the wrinkles are stretched by the wrinkle smoothing roller 36 is conveyed toward the lower side of the printing unit 22B (S28), and the state is changed by the high friction roller 41a provided below the printing unit 22B. It is maintained (S30).

Then, the print control unit 24 controls each head unit 51 of the print unit 22B to perform a print process on the back surface of the print medium W (S32).

The print control unit 24 continues the printing process until the printing of the images on all pages is completed (S34, NO).

Then, when the printing process of all the page images is completed (S34, YES), the transmission control unit 13 gradually weakens the brake 12 as the speed of the transport motor 46 decreases, and when the transport motor 46 stops, the print medium. The brake is maintained with a force such that W does not bend, and the take-up control unit 63 stops the take-up motor 62. As a result, the transfer of the print medium W is completed, and a series of printing operations is completed.

The above is a description of the printing operation of the inkjet printing apparatus 1 of the present embodiment.

In the inkjet printing apparatus 1 of the above embodiment, the holding angle of the printing medium W in the high friction roller 41a is changed by moving the friction roller 44, but the friction roller 44 is not limited to the high friction roller 44. Any configuration may be used as long as the holding angle of the print medium W on the roller 41a is changed, and for example, a simple guide plate may be used.

Further, in the inkjet printing apparatus 1 of the above embodiment, the high friction roller 41a is provided for each head unit 51, but the present invention is not limited to this, and for example, one high friction roller 41a is provided for every two head units 51. In short, the high friction rollers 41a may be provided in such a number that the wrinkles stretched by the wrinkle smoothing roller 34 cannot be restored.

Further, in the inkjet printing apparatus 1 of the above embodiment, the amount of movement of the friction roller 44 is changed according to the thickness of the printing medium W, but the movement amount is not limited to this, and the slipperiness of the surface of the printing medium W is not limited to this. The amount of movement of the friction roller 44 (the holding angle of the print medium W in the high friction roller 41a) may be changed accordingly. For example, when the type of the print medium W has a slippery surface, the amount of movement of the friction roller 44 is increased, and when the surface of the printing medium W is not slippery, the amount of movement of the friction roller 44 is decreased. You may try to do it.

Further, in the inkjet printing apparatus 1 of the above embodiment, the user sets and inputs the type of the print medium W using the operation panel 23, but the present invention is not limited to this, and for example, the print medium W included in the print job. The type may be used.

Further, in the above embodiment, the printing unit of the printing apparatus of the present invention is a printing unit having an inkjet head, but the printing unit is not limited to this, and the printing unit includes a photoconductor unit that transfers toner to perform printing processing. It may be a thing.

Further, the above embodiment is an example in which the present invention is applied to an inkjet printing apparatus 1 that performs a printing process on a long printing medium W wound in a roll shape, but the printing medium W is not necessarily such. It does not have to be a roll-shaped print medium W. That is, the present invention may be applied to any printing apparatus as long as it is a printing apparatus that performs a printing process on a printing medium W in which wrinkles are generated due to tension during transportation.

The following additional notes are further disclosed with respect to the printing apparatus of the present invention.
(Additional note)

The printing apparatus of the present invention can be provided with a holding angle changing mechanism for changing the holding angle of the printing medium in the high friction roller, and the holding angle changing mechanism changes the holding angle according to the type of the printing medium. Can be done.

Further, in the printing apparatus of the present invention, the holding angle changing mechanism can increase the holding angle when the printing medium is thin paper.

Further, in the printing apparatus of the present invention, the high friction roller is provided on the upstream side of the support roller. As a result, the printing unit is conveyed between the high friction roller and the support roller, so that the printing process can be performed by ejecting ink to the printing medium W in a non-flexible state.

1 Inkjet printing device 2 Sending unit 3 Printing device main unit 4 Winding unit 10 Roll 11 Roll support shaft 12 Brake 13 Sending control unit 14 Transmission control unit 21 Conveying unit 22A, 22B Printing unit 23 Operation panel 24 Printing control unit 31 to 33 , 35, 37-40 Guide roller 34, 36 Wrinkle smoothing roller 41 Under-head roller set 41a High friction roller 41b Support roller 42 Serpentine control roller 42a, 42b Serpentine control roller 42c Serpentine control motor 42d Edge sensor 43 Conveying roller 44 Friction roller 45 Roller moving mechanism 46 Conveying motor 51 Head unit 51K, 51C, 51M, 51Y, 51P Head unit 60 Printed roll 61 Winding shaft 62 Winding motor 63 Winding control unit G groove W Printing medium

Claims (4)

A transport unit that transports print media and
A printing unit that performs printing processing on the printing medium transported by the transport unit, and a printing unit.
It is provided on the upstream side of the printing unit and is provided with a wrinkle smoothing mechanism for smoothing out wrinkles generated in the printing medium conveyed by the transport unit.
A printing device in which the transport portion has a support roller that supports the print medium and a high friction roller that is provided on the downstream side of the wrinkle smoothing mechanism and has a higher frictional force than the support roller. A hugging angle changing mechanism for changing the hugging angle of the print medium in the high friction roller is provided.
The printing apparatus according to claim 1, wherein the holding angle changing mechanism changes the holding angle according to the type of the printing medium. The printing apparatus according to claim 2, wherein the holding angle changing mechanism increases the holding angle when the printing medium is thin paper. The high friction roller is provided on the upstream side of the support roller.
The printing apparatus according to any one of claims 1 to 3, wherein the printing unit ejects ink to the printing medium conveyed between the high friction roller and the support roller to perform the printing process.

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