Winding device and printing-and-winding system

Abstract

To provide a winding device allowed to improve the quality of a print image and a printing-and-winding system.SOLUTION: A winding device comprises: a take-up shaft on which a printing medium fed from a printing device having a feed unit to feed the printing medium is wound; a power input unit to which power for the feed unit is inputted; a power transmission mechanism that transmits power inputted to the power input unit to the take-up shaft; a lever that is arranged between the printing device and the take-up shaft and bends an advancing direction of the printing medium into a vertical direction; and a friction unit that is arranged between the printing device and the lever and contacts the printing medium being fed toward the take-up shaft and gives friction resistance to it. The friction unit has a roller provided with a one-way clutch that does not rotate if the take-up shaft rotates in a direction to wind the printing medium and rotates the printing medium in a direction of feeding toward the printing device if the take-up shaft rotates in a direction to unwind the printing medium.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a winding device and a printing and winding system.

Background Art

[0002] Patent Document 1 discloses a winding device and the like in which an adverse effect on the feeding accuracy of a printing medium is suppressed. The winding device disclosed in Patent Document 1 includes a printing device having a feeding unit that feeds roll paper, a winding shaft around which the roll paper sent from the printing device is wound, a power input unit to which power from the feeding unit is input, and a winding-side power transmission mechanism that transmits the power input to the power input unit to the winding shaft. This winding device is movable between a first position that bends the feeding path of the roll paper from the printing device to the winding shaft and a second position that bends the feeding path at an angle shallower than the first position, and includes a lever on which a force toward the first position acts.

[0003] In the above-described winding device, in some cases, a friction portion is provided that suppresses the force applied to the roll paper, which is the printing medium, when it is wound around the winding shaft. The friction portion imparts a frictional force to the printing medium that is fed out by contacting the printing medium on the conveyance path of the printing medium. Thereby, in the winding device, the force applied to the printing medium by the feeding unit is alleviated. Furthermore, among the above-described printing devices, some perform reverse-feed printing in which the printing medium sent to the winding device side by the feeding unit is sent back to the printing device side again for printing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in a winding device such as Patent Document 1, when the printing device performs reverse printing, there is a risk that the print image quality may deteriorate because a frictional force is applied to the printing medium by the friction portion.

Means for Solving the Problem

[0006] One aspect for solving the above problems is a take-up shaft around which the printing medium sent from a printing device having a feeding unit for feeding the printing medium is wound, a power input unit to which the power of the feeding unit is input, a power transmission mechanism for transmitting the power input to the power input unit to the take-up shaft, a lever disposed between the printing device and the take-up shaft for bending the traveling direction of the printing medium in the vertical direction, and a friction portion disposed between the printing device and the lever for applying frictional resistance in contact with the printing medium sent toward the take-up shaft, wherein the friction portion does not rotate when the take-up shaft rotates in the direction of winding the printing medium, and rotates in the direction of sending the printing medium toward the printing device side when the take-up shaft rotates in the direction of feeding out the printing medium, and the take-up device has a roller provided with a one-way clutch.

[0007] Another aspect for solving the above problems is a printing and take-up system having the take-up device and the printing device.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the descriptions of directions such as front, rear, left, right, up, and down are the same as the directions with respect to the printing apparatus 2 unless otherwise specified. In each figure, the reference sign FR indicates the front of the printing apparatus 2, the reference sign UP indicates the upper side of the printing apparatus 2, and the reference sign LH indicates the left side of the printing apparatus 2.

[0010] FIG. 1 is a main part side view showing each part related to the conveyance path R of the printing and winding system 1. In FIG. 1, for convenience of explanation, the conveyance direction C, the crossing direction I, and the printing medium 100 are indicated by a one-dot chain line. As shown in FIG. 1, the printing and winding system 1 includes a printing apparatus 2 and a winding apparatus 120 attached to the printing apparatus 2. The printing apparatus 2 is a so-called line type inkjet printer that includes a line-shaped inkjet head and ejects ink from the inkjet head to print characters and images on the printing medium.

[0011] The printing medium used for printing in the printing apparatus 2 is a cut sheet or a continuous sheet cut to a predetermined size. These sheets are formed of paper, synthetic resin, or the like. These sheets may be, for example, fine paper that has been surface-treated to enhance the ink absorption ability and fixing property and is suitable for inkjet printing.

[0012] The continuous sheet may be, for example, a roll paper housed in the printing apparatus 2 in a rolled state, or a fanfold paper supplied to the printing apparatus 2 from the outside of the printing apparatus 2 in a folded state. As the roll paper, in addition to papers such as plain paper and fine paper rolled in a roll shape, label papers with adhesive attached to the back surface and arranged on a release paper, which is a backing paper, in a roll shape may also be used.

[0013] The printing apparatus 2 includes an apparatus case 10 having a substantially rectangular parallelepiped shape. The apparatus case 10 is formed by combining side panels, front panels, etc., to form the outer shell of the printing apparatus 2. On the front surface of the apparatus case 10, a display / operation panel 12 on which a display, operation buttons, etc. are arranged is provided in the upper half closer to the left. As shown in FIG. 1, on the front surface of the apparatus case 10, a slit-shaped paper discharge port 14 extending in the left-right direction is formed substantially at the center closer to the right. In the printing apparatus 2, the printed print medium 100 is discharged from the paper discharge port 14.

[0014] A paper cover 16 is provided on the rear part of the apparatus case 10 so as to be openable and closable from the right side surface to the upper surface. A storage portion 20 is provided inside the paper cover 16. In the printing apparatus 2, by opening the paper cover 16, the roll-shaped print medium 100 can be loaded into the storage portion 20.

[0015] FIG. 2 is a main part side view showing each part related to the conveyance path R of the printing and winding system 1. In FIG. 2, for convenience of explanation, the print medium 100 in the conveyance path R is indicated by a one-dot chain line. In the following drawings, as in FIG. 2, for convenience of explanation, the print medium 100 in the conveyance path R is indicated by a one-dot chain line. The printing apparatus 2 includes a storage portion 20 for storing the print medium 100, a printing portion 22 for printing on the print medium 100, and a conveyance portion 24 for conveying the print medium 100 from the storage portion 20 to the printing portion 22. In the printing apparatus 2, the storage portion 20 is provided on the rear side, the printing portion 22 is provided on the front side of the storage portion 20. The conveyance portion 24 is provided below the printing portion 22.

[0016] The storage unit 20 includes a roll shaft 26 to which the printing medium 100 is attached. The roll shaft 26 is a rod-shaped member provided rotatably in the circumferential direction. The printing medium 100 is stored in the storage unit 20 by inserting the roll shaft 26 through the center of the roll of the printing medium 100. A driving device such as a motor may be connected to the roll shaft 26 and may rotate with the driving of the driving device. In the printing apparatus 2, the printing medium 100 rotates as the roll shaft 26 rotates.

[0017] In the printing apparatus 2, a conveyance path R is formed through which one end of the printing medium 100 attached to the roll shaft 26 is drawn out and conveyed to the paper discharge port 14. In the conveyance path R, a tension lever 28 is attached above the printing medium 100 stored in the storage unit 20. The tension lever 28 has a curved surface in the circumferential direction and is formed in a columnar shape extending in the left-right direction. The tension lever 28 applies tension to the printing medium 100 to prevent slack. One end of the printing medium 100 is drawn upward, contacts the tension lever 28, is bent by the tension lever 28, and then extends forward.

[0018] A paper guide unit 30 is provided in front of the tension lever 28. The paper guide unit 30 guides the printing medium 100 forward and suppresses skewing of the printing medium 100 and deviation in the conveyance of the printing medium 100.

[0019] A paper guide unit 30 is provided in front of the tension lever 28. The paper guide unit 30 guides the printing medium 100 forward and suppresses skewing of the printing medium 100 and deviation in the conveyance of the printing medium 100. The paper guide unit 30 includes a lower guide member 32 that supports the printing medium 100 from below and a paper pressing member 34 located on the upper surface side of the printing medium 100. The printing medium 100 is conveyed in a state of being sandwiched between the lower guide member 32 and the paper pressing member 34 in the paper guide unit 30.

[0020] In front of the paper guide unit 30, a printing unit 22 for printing on the printing medium 100 is provided. The printing unit 22 includes a platen 40 and a print head 42. The print head 42 of the present embodiment ejects four colors of ink, namely C (cyan), M (magenta), Y (yellow), and K (black), to form dots on the printing surface of the label. The print head 42 includes a nozzle section 41 for ejecting K (black) ink, a nozzle section 43 for ejecting C (cyan) ink, a nozzle section 45 for ejecting M (magenta) ink, and a nozzle section 47 for ejecting Y (yellow) ink. A plurality of nozzles for ejecting ink are arranged in a row in the width direction of the printing medium 100 in the nozzle sections 41 to 47. The nozzle sections 41 to 47 are arranged along the intersection direction I in which the nozzles provided in each of them intersect the conveyance direction C. As shown in FIG. 1, in the present embodiment, the intersection direction I is a direction orthogonal to the conveyance direction C. The intersection direction I coincides with the width direction of the printing medium 100.

[0021] The print head 42 is a line inkjet head capable of ejecting ink without performing scanning in the width direction of the printing medium 100. Therefore, the nozzle rows of the nozzle sections 41 to 47 are formed to have a width that is at least the same as or wider than the printable range of the printing medium 100. In the present embodiment, the printable range corresponds to the printing surface of the label. In the present embodiment, a configuration example in which the nozzle sections 41, 43, 45, and 47 are arranged in this order along the conveyance direction C of the printing medium 100 is given, but the arrangement order of the nozzles of each color in the conveyance direction C is arbitrary.

[0022] The platen 40 has a plane arranged along the conveyance direction C. This plane is located below the conveyance path R and faces the print head 42. The nozzle sections 41 to 47 and the platen 40 are arranged with a space therebetween, which is a so-called platen gap. The platen 40 supports the printing medium 100 from below. The platen 40 is provided over at least the entire printing range in the printing unit 22. The plane of the platen 40 is arranged substantially horizontally in the installed state and the used state of the printing apparatus 2.

[0023] The conveying unit 24 includes a cylindrical conveying roller 50. The conveying roller 50 is arranged with its longitudinal direction extending along the intersecting direction I and is rotatably provided in the circumferential direction. The conveying roller 50 is arranged in front of the paper guiding unit 30 and at the rear end of the platen 40.

[0024] For example, a driven wheel is provided at one end of the conveying roller 50. A transmission belt 51 is wound around the driven wheel. This transmission belt 51 is wound around the drive shaft of the conveying motor 52. Thereby, the conveying roller 50 and the conveying motor 52 are connected via the transmission belt 51. The conveying motor 52 is a driving device for rotationally driving the conveying roller 50. The conveying motor 52 can rotate in two directions, namely, the direction of sending out the printing medium 100 from the accommodating part 20 toward the paper discharge port 14 and the direction of sending out from the paper discharge port 14 toward the printing part 22. The conveying motor 52 and the transmission belt 51 are provided below the platen 40.

[0025] The conveying unit 24 includes a plurality of paper feed driven rollers 54. A plurality of the paper feed driven rollers 54 are rotatably arranged along the longitudinal direction of the conveying roller 50. All of the paper feed driven rollers 54 are biased so that their circumferential surfaces are in contact with the circumferential surface of the conveying roller 50. Thereby, the conveying roller 50 and the paper feed driven rollers 54 are arranged opposite to each other. Therefore, the conveying roller 50 is arranged on the lower guide member 32 side, and the paper feed driven rollers 54 are arranged on the paper pressing member 34 side.

[0026] In the conveying unit 24, when the conveying motor 52 is driven, the conveying roller 50 is rotationally driven via the transmission belt 51, and the paper feed driven rollers 54 are driven to rotate passively. Thereby, the printing medium 100 loaded between the lower guide member 32 and the paper pressing member 34 is sandwiched between the conveying roller 50 and the paper feed driven rollers 54 and is conveyed to the printing part 22 as the conveying roller 50 rotates. When the printing medium 100 is conveyed to the printing unit 22, it is printed by the printing unit 22. After that, the printing medium 100 is discharged from the paper discharge port 14 by the driving of the conveying unit 24.

[0027] In the printing apparatus 2, by driving the conveyance motor 52 in a direction opposite to the rotation direction in which the printing medium 100 is sent out from the storage unit 20 toward the paper discharge port 14, it is possible to pull back the printing medium 100 discharged from the paper discharge port 14 to the printing unit 22. And in the printing apparatus 2, it is possible to print on the printing medium again by the printing unit 22. In the following description, the direction in which the printing medium 100 is sent out from the storage unit 20 toward the paper discharge port 14 is defined as the forward feeding direction, and the direction in which the printing medium 100 is pulled back from the paper discharge port 14 toward the printing unit 22 is defined as the reverse feeding direction.

[0028] Note that the conveyance roller 50 may be arranged on the lower guide member 32 side, in other words, on the paper guide unit 30 side. Also, for example, the conveyance unit 24 may include a conveyance belt movable on the upper surface of the platen 40 instead of the conveyance roller 50.

[0029] In the printing apparatus 2, a label detector 56 is provided in the conveyance path R on the downstream side of the paper guide unit 30 and on the upstream side of the conveyance roller 50. The label detector 56 detects the leading end and trailing end of the printing medium 100, and the leading end and trailing end of the label. The label detector 56 is, for example, an optical transmissive sensor provided with a light emitting unit 58 on the lower surface side of the printing medium 100 and a light receiving unit 59 on the upper surface side of the printing medium 100 in the conveyance path R. The light emitting unit 58 and the light receiving unit 59 are arranged to face each other with a space therebetween that allows the printing medium 100 to pass along the vertical direction. That is, the light emitting unit 58 and the light receiving unit 59 are arranged at substantially the same position in the front - rear direction.

[0030] Note that the label detector 56 may be disposed on the downstream side of the conveyance roller 50 and on the upstream side of the print head 42. For example, the light emitting unit 58 may be disposed on the side of the paper pressing member 34, and the light receiving unit 59 may be disposed on the side of the lower guide member 32. Similarly, the light emitting unit 58 may be disposed on the side of the platen 40, and the light receiving unit 59 may be disposed on the side of the print head 42.

[0031] For the light emitting unit 58, a light emitting element such as an LED (Light-emitting diode) is used. For the light receiving unit 59, a light receiving element such as a photo transistor, a photo IC, or a photo diode is used. When the light receiving element receives light having a signal intensity equal to or greater than a predetermined value, it outputs a detection voltage as an output value indicating the amount of received light according to the amount of received light.

[0032] In the label detector 56, the light emitting unit 58 and the light receiving unit 59 can be arranged at positions where the light receiving unit 59 can receive the light emitted from the light emitting unit 58 at a predetermined signal intensity. In this case, the output value indicating the amount of light received by the light receiving unit 59 differs depending on whether there is no print medium 100 directly below the light receiving unit 59, whether there is a backing sheet, or whether there is a label. Therefore, the label detector 56 can detect the leading and trailing ends of the print medium 100 and the leading and trailing ends of the label based on the output value indicating the amount of light received by the light receiving unit 59.

[0033] A cutter unit 110 is disposed on the downstream side, i.e., the front side, of the print head 42. The cutter unit 110 includes a fixed blade 112 and a movable blade 114 disposed with the conveyance path R therebetween, and the movable blade 114 is connected to a drive device such as a motor that drives the cutter via a gear or the like. In the cutter unit 110, when the motor is driven, the movable blade 114 moves toward the fixed blade 112 side to cut the print medium 100. The cutter unit 110 may make a cut that leaves a part in the width direction of the print medium 100, or may completely cut the print medium 100. The printing apparatus 2 cuts the print medium 100 printed by the print head 42 to a predetermined length by the cutter unit 110 and discharges it from the paper discharge port 14. Note that the cutter unit 110 is formed separately from the printing apparatus 2 and may be detachably provided, for example, on the front surface of the printing apparatus 2.

[0034] The printing apparatus 2 includes a control board 18 that controls each part of the printing apparatus 2. The control board 18 includes a CPU, a ROM, a RAM, etc. as an arithmetic execution unit. In the ROM of the control board 18, firmware executable by the CPU, data related to the firmware, etc. are stored non-volatilely. Also, in the RAM, data related to the firmware executed by the CPU, etc. are stored temporarily. The control board 18 may include other peripheral circuits, etc. The control board 18 may include a storage unit capable of storing various programs and data such as control programs and data related to these control programs non-volatilely.

[0035] The control board 18 is formed so as to be able to detect operations by the user and the conveyance amount of the printing medium 100, etc. The control board 18 is formed so as to be able to control drive devices included in the printing apparatus 2 such as the conveyance motor 52. In the printing head 42, the control board 18 supplies voltage to a pump that supplies ink from the ink tank and piezo elements provided in the nozzle parts 41 to 47 of the printing head 42 to operate them. Thereby, in the printing apparatus 2, ink droplets are ejected from each nozzle of the nozzle parts 41 to 47 to form dots. The control board 18 is formed so as to cause the light emitting element to emit light and to be able to acquire the detection value of the label detector 56. That is, the label detector 56 functions as a detection means in cooperation with the control board 18.

[0036] FIG. 3 is a main part side view showing each part related to the conveyance path R of the printing and winding system 1. In FIG. 3, the lever 90 and the friction part 130 are omitted and shown. As shown in FIGS. 2 and 3, on the front surface of the printing apparatus 2, a winding device 120 is detachably formed below the paper discharge port 14. The winding device 120 includes a winding drum 122 that winds the print medium 100 discharged from the paper discharge port 14. The winding drum 122 is a columnar or cylindrical shaft member whose longitudinal direction extends along the intersection direction I. The winding drum 122 is driven by power input from the conveyance motor 52 via a printing-side power transmission mechanism 60 provided in the printing apparatus 2 and a winding-side power transmission mechanism 70 provided in the winding device 120.

[0037] As shown in FIG. 3, the printing-side power transmission mechanism 60 includes an output gear 62 connected to the output shaft of the conveyance motor 52 and a connecting gear 64 that meshes with the output gear 62.

[0038] The winding-side power transmission mechanism 70 includes a connecting gear 72 provided at an end portion located on the printing apparatus 2 side in the winding device 120. A one-way clutch 73 is provided on the connecting gear 72. The winding-side power transmission mechanism 70 includes a small pulley 74 and a large pulley 76 that share the same axis as the connecting gear 72. An endless belt 78 is looped around the small pulley 74 and the large pulley 76. The winding-side power transmission mechanism 70 includes an intermediate gear 80 and a shaft gear 82 that share the same axis as the large pulley 76, and the shaft gear 82 meshes with the intermediate gear 80. The shaft gear 82 shares the same axis as the winding drum 122.

[0039] In the printing and winding system 1, when the winding device 120 is attached to the front surface of the printing apparatus 2, the connecting gear 64 and the connecting gear 72 mesh with each other. Thereby, the printing-side power transmission mechanism 60 and the winding-side power transmission mechanism 70 are connected. When the conveyance motor 52 is driven so that the print medium 100 is fed in the forward feed direction, the winding drum 122 is driven by power input from the conveyance motor 52 via the printing-side power transmission mechanism 60 and the winding-side power transmission mechanism 70.

[0040] The take-up drum 122 rotates toward the front side of the printing apparatus 2 to take up the print medium 100 discharged from the paper discharge port 14. When the take-up apparatus 120 is used, the printing apparatus 2 does not cut the print medium 100 with the cutter unit 110 and discharges the print medium 100 from the paper discharge port 14 in a long state. The take-up apparatus 120, for example, prints all of one roll of the print medium 100 stored in the storage unit 20 in one operation of the printing apparatus 2, and by rotating the take-up drum 122 in the direction in which the take-up drum 122 takes up the print medium 100, it is possible to take up the print medium 100 on the take-up drum 122. The take-up drum 122 corresponds to the "take-up shaft".

[0041] As described above, the one-way clutch 73 is provided in the connecting gear 72. The one-way clutch 73 transmits the power of the conveyance motor 52 to the connecting gear 72 when the conveyance motor 52 is driven so that the print medium 100 is fed in the forward feed direction. The one-way clutch 73 does not transmit the power of the conveyance motor 52 to the connecting gear 72 and idles the connecting gear 72 when the conveyance motor 52 is driven so that the print medium 100 is fed in the reverse feed direction. As a result, in the print take-up system 1, when the print medium 100 is fed in the reverse feed direction, the power of the conveyance motor 52 being applied to the print medium 100 is suppressed. For this reason, in the print take-up system 1, it is possible to reduce the tension applied to the print medium 100 when the print medium 100 is fed in the reverse feed direction. When the print medium 100 is fed in the reverse feed direction, the take-up drum 122 rotates in the pay-out direction, which is the direction opposite to the forward feed and the direction in which the print medium 100 is paid out.

[0042] FIG. 4 is a main part side view showing each part related to the conveyance path R of the print take-up system 1. In FIG. 4, the print side power transmission mechanism 60 and the take-up side power transmission mechanism 70 are shown with omission. As shown in FIG. 4, the take-up apparatus 120 includes a lever 90. The lever 90 includes a lever roller 92 and a roller shaft 94 that rotatably supports the lever roller 92.

[0043] One end of the roller shaft 94 is inserted into a moving opening 121 provided in the take-up device 120. The moving opening 121 is an opening disposed between the paper discharge port 14 and the take-up drum 122 in the conveyance direction C. The moving opening 121 is formed in an arc shape centered on the rotation axis of the take-up drum 122 when viewed from the crossing direction I. The roller shaft 94 inserted into the moving opening 121 is cantilever-supported by the take-up device 120 so as to extend parallel to the take-up drum 122 while being biased downward in the vertical direction by a biasing member such as a spring material.

[0044] The lever roller 92 has a cylindrical shape that extends substantially parallel to the take-up drum 122 while being inserted through the roller shaft 94. The lever roller 92 has a length dimension of at least the width dimension of the print medium 100 or more. The outer peripheral surface of the lever roller 92 is formed of a rubber material or the like having a predetermined coefficient of friction.

[0045] The print medium 100 sent out from the paper discharge port 14 is wound around the outer peripheral surface located on the lower side of the lever 90 and then wound around the take-up drum 122. As described above, the lever 90 is attached to the take-up device 120 in a state of being biased by a biasing member via the moving opening 121. Thereby, the lever 90 can move up and down along the vertical direction according to the tension of the print medium 100 being wound. For this reason, in the print take-up system 1, it is possible to reduce the tension applied to the print medium 100 by the lever 90. In the present embodiment, the lever 90 can move along the vertical direction from below the rotation axis of the take-up drum 122 to a position substantially at the same height as the rotation axis of the take-up drum 122.

[0046] In the take-up device 120, the print medium 100 is conveyed in a state of being bent downward by being wound around the lever 90. Thereby, in the print take-up system 1, even when there is a variation in the mounting position when the take-up device 120 is attached to the printing device 2, it is possible to suppress the print medium 100 from being sent obliquely.

[0047] The lever roller 92 is driven to rotate passively by the friction with the printing medium 100 being fed. For this reason, in the printing winding system 1, the lever 90 suppresses the rubbing of the printing surface of the printing medium 100.

[0048] The winding device 120 includes a friction portion 130. The friction portion 130 includes a friction roller 132 and a roller shaft 134 that rotatably supports the friction roller 132. The roller shaft 134 is fixed so as to extend substantially parallel to the lever 90 between the paper discharge port 14 and the lever 90 in the conveyance direction C.

[0049] The friction roller 132 has a cylindrical shape that extends substantially parallel to the winding drum 122 while being inserted through the roller shaft 134. The friction roller 132 has a length dimension of at least the width dimension of the printing medium 100 or more. The outer peripheral surface of the friction roller 132 is formed of a rubber material or the like having a predetermined coefficient of friction. The printing medium 100 sent out from the paper discharge port 14 is wound around the outer peripheral surface located on the upper side of the friction roller 132 and then wound around the winding drum 122 via the lever 90. The friction roller 132 corresponds to a "roller".

[0050] The friction roller 132 is connected to the roller shaft 134 via a one-way clutch 136. When the printing medium 100 is fed in the forward feeding direction, the friction roller 132 does not rotate by the one-way clutch 136. As a result, the printing medium 100 is given frictional resistance by moving in contact with the outer peripheral surface located on the upper side of the friction roller 132.

[0051] When the printing medium 100 is fed in the forward feeding direction, a force in the direction of pulling out the printing medium 100 from the printing device 2 is generated on the printing medium 100. In the present embodiment, by applying frictional resistance by the friction roller 132, a frictional force is applied in the direction opposite to the force. As a result, the winding device 120 can suppress a decrease in the feeding accuracy of the print medium 100 by the printing device 2. Therefore, in the print winding system 1, it is possible to suppress the landing position of the ink from shifting and suppress a decrease in print quality.

[0052] When the print medium 100 is fed in the reverse feed direction, the friction roller 132 is idled by the one-way clutch 136. As a result, when the print medium 100 is fed in the reverse feed direction, the friction roller 132 rotates, and thus no frictional resistance by the friction roller 132 is applied to the print medium 100.

[0053] FIG. 5 is a side view schematically showing the force applied to the print medium 100 conveyed to the print winding system 1. As shown in FIG. 5, when the print medium 100 is fed in the reverse feed direction, a force F is applied to the print medium 100. The force F is a so-called conveyance load of the print medium 100. The force F is represented by the following formula (1). F = T × e μθ (1) In formula (1), T is the tension applied to the print medium 100. μ is the coefficient of friction between the print medium 100 and the friction roller 132. θ is the winding angle formed by both ends in the arc formed by the region where the outer peripheral surface of the friction roller 132 contacts the print medium 100 and the rotation center of the friction roller 132.

[0054] FIG. 6 is a rear view schematically showing the friction portion 130 and the lever 90. As shown in FIG. 6, in the winding device 120, depending on the assembly accuracy of the winding device 120 and the like, the friction portion 130 and the lever 90 may be arranged so as to extend in a direction intersecting the longitudinal direction with respect to the intersecting direction I. That is, in the winding device 120, in a rear view, the friction portion 130 and the lever 90 may be arranged so as not to be substantially parallel. In this case, the path length L1, which is the distance between the ends located on the right side of the friction portion 130 and the lever 90, and the path length L2, which is the distance between the ends located on the left side of the friction portion 130 and the lever 90, have different length dimensions.

[0055] FIG. 7 is a plan view schematically showing the forces applied to the printing medium 100 conveyed to the printing winding system 1. As described above, when the path length L1 and the path length L2 have different lengths, in the printing medium 100, a stretching force is applied to the end side with the longer path length, and the paper sags on the end side with the shorter path length. As a result, a tension difference occurs in the printing medium 100 along the crossing direction I. For this reason, as shown in FIG. 7, the force F, which is the conveyance load, occurs at a position biased from the approximate center in the direction along the crossing direction I to one end in the direction along the crossing direction I in the printing medium 100.

[0056] As a result, a moment M that rotates along the crossing direction I may be generated in the printing medium 100. The moment M is represented by the following formula (2). M = F × L (2) In formula (1), L represents the distance between the center of the printing medium 100 and the position where the force F is applied to the printing medium 100 in the crossing direction I. The position L is determined by the parallelism between the friction portion 130 and the lever 90. For this reason, the position L is represented by, for example, the following formula (3). L = f(L1, L2) (3) When the moment M occurs, the printing medium 100 may be skewed, which is so-called skew. In this case, in the printing winding system 1, when printing is performed by reverse-feeding the printing medium 100, there is a risk that the landing deviation of the ink on the printing medium 100 may occur.

[0057] In the present embodiment, when the conveyance motor 52 is driven so that the printing medium 100 is conveyed in the reverse conveyance direction, the one-way clutch 136 does not transmit the rotation of the friction roller 132 and allows the friction roller 132 to idle. As a result, it is possible to suppress the application of the frictional resistance of the friction roller 132 to the printing medium 100, and the coefficient of friction μ between the printing medium 100 and the friction roller 132 is reduced. For this reason, in the printing winding system 1, an increase in the force F and the moment M applied to the printing medium 100 is suppressed. Then, in the printing winding system 1, it is possible to improve the printing accuracy.

[0058] In the winding device 120, depending on the assembly accuracy of the winding device 120 and the like, the friction portion 130 and the lever 90 may be arranged so as to extend in a direction intersecting the longitudinal direction with respect to the conveyance direction C. That is, in the winding device 120, in a plan view, the friction portion 130 and the lever 90 may not be arranged substantially parallel to each other. In this case, the path length, which is the distance between the end portions located on the left side of the friction portion 130 and the lever 90, and the path length, which is the distance between the end portions located on the left side of the friction portion 130 and the lever 90, have different length dimensions.

[0059] Even in such a case, by providing the one-way clutch 136, in the printing winding system 1, an increase in the force F and the moment M applied to the printing medium 100 is suppressed. For this reason, in the printing winding system 1, it is possible to improve the printing accuracy.

[0060] The above embodiment merely shows a specific example to which the present invention is applied. The present invention is not limited to the configuration of the above embodiment, and can be implemented in various aspects without departing from the gist of the invention.

[0061] FIG. 8 is a main part side view showing each part related to the conveyance path R of the printing winding system 1 in the modification. As shown in FIG. 8, in the printing and winding system 1, a pair of eccentric cams 140 are provided on the winding device 120. Each of the eccentric cams 140 is attached to each of both ends of the cam shaft 142. The cam surface 141 of the eccentric cam 140 has different distances from the cam shaft 142 along the circumferential direction.

[0062] Each of the eccentric cams 140 abuts on the roller shaft 134 at the cam surface 141. The roller shaft 134 is supported at both ends by each of the eccentric cams 140. When the printing device 2 performs reverse feed printing, a drive mechanism provided in the printing device 2 is connected to the cam shaft 142. By the drive mechanism, the cam shaft 142 and the eccentric cam 140 are rotationally driven.

[0063] FIG. 9 is a side view showing the force applied to the printing medium 100 conveyed to the printing and winding system 1 in the modified example. When each of the eccentric cams 140 is rotationally driven, as shown in FIG. 9, it moves from the position P1 when the friction part 130 is fed forward to a position P2 located below the position P1. Thereby, in the printing and winding system 1, the winding angle θ becomes smaller. For this reason, in the printing and winding system 1, the increase in the force F and the moment M applied to the printing medium 100 is suppressed, and the printing accuracy can be improved.

[0064] Each of the eccentric cams 140 may be attached to the cam shaft 142 with the phases of the cam surfaces 141 shifted from each other. In this case, by rotating the cam shaft 142, the inclination of the roller shaft 134 with respect to the intersection direction I can be adjusted. Thereby, in the printing and winding system 1, the difference in the length dimensions between the path length L1 and the path length L2 can be reduced. For this reason, in the printing and winding system 1, the increase in the moment M applied to the printing medium 100 is suppressed, and the printing accuracy can be improved.

[0065] Further, the eccentric cam 140 may be provided only at one end of the camshaft 142. In this case, by rotating the camshaft 142, the inclination with respect to the intersection direction I of the roller shaft 134 can be adjusted. As a result, in the printing winding system 1, the difference in the length dimensions between the path length L1 and the path length L2 can be reduced. For this reason, in the printing winding system 1, the increase in the moment M applied to the printing medium 100 is suppressed, and the printing accuracy can be improved. The eccentric cam 140 corresponds to an "angle adjustment unit" and a "roller movement unit".

[0066] In the above-described embodiment, a label printer is exemplified as the printing device 2. However, the printing device 2 is not limited to a label printer. The printing device 2 may be any device that includes a conveying device for conveying a printing medium and a printing unit for performing printing on the printing medium. For example, the printing device 2 may be a large-format printer or a printing machine for performing printing by dyeing.

[0067] In the above-described embodiment, a line head type is exemplified as the printing head 42, but it is not limited thereto, and a serial head type may also be used. Further, the printing method of the printing head 42 is not limited to an inkjet type.

[0068] The above-described directions such as horizontal and vertical, and various numerical values and shapes in the embodiment include a so-called equivalent range that exhibits the same effects as those directions, numerical values, and shapes unless otherwise specified.

[0069] [Summary of the Present Disclosure] Hereinafter, a summary of the present disclosure is appended.

[0070] (Appended Note 1) A take-up shaft around which the print medium sent from a printing apparatus having a feeding unit for sending the print medium is wound, a power input unit to which power of the feeding unit is input, a power transmission mechanism for transmitting the power input to the power input unit to the take-up shaft, a lever disposed between the printing apparatus and the take-up shaft for bending the traveling direction of the print medium in the vertical direction, and a friction unit disposed between the printing apparatus and the lever for applying frictional resistance in contact with the print medium sent toward the take-up shaft, wherein the friction unit includes a roller provided with a one-way clutch that does not rotate when the take-up shaft rotates in the direction of winding the print medium and rotates in the direction of sending the print medium toward the printing apparatus when the take-up shaft rotates in the direction of feeding out the print medium. Thereby, in the take-up device, an increase in the force and moment applied to the print medium is suppressed.

[0071] (Appendix 2) The power transmission mechanism according to Appendix 1, which transmits the power input to the power input unit to the take-up shaft when the feeding unit sends the print medium, and does not transmit the power input to the power input unit to the take-up shaft when the feeding unit returns the print medium. Thereby, in the take-up device, the print medium can be wound, and when the print medium is sent in reverse, the tension applied to the print medium can be reduced.

[0072] (Appendix 3) The lever according to Appendix 1 or Appendix 2 is movable between a first position and a second position that bends the traveling direction of the print medium at an angle shallower than the first position, is biased toward the first position, and the friction unit bends the traveling direction of the print medium toward the lever by contacting the print medium. Thereby, in the take-up device, even when there is a variation in the mounting position when the take-up device is mounted on the printing apparatus, it is possible to suppress the print medium from being sent obliquely.

[0073] (Appendix 4) The roller is provided so as to be movable in the vertical direction, and a roller moving unit is provided which positions the roller at a third position when the winding shaft rotates in the winding direction and positions the roller at a fourth position lower than the third position when the winding shaft rotates in the feeding direction. The winding device according to any one of Appendices 1 to 3. As a result, in the winding device, the winding angle at which the printing medium is wound around the roller becomes smaller, and an increase in the force and moment applied to the printing medium is suppressed.

[0074] (Appendix 5) The winding device according to any one of Appendices 1 to 4, comprising an adjustment unit that adjusts the angle of the roller with respect to the axial direction. As a result, in the winding device, an increase in the moment applied to the printing medium is suppressed.

[0075] (Appendix 6) A printing and winding system having the winding device according to any one of Appendices 1 to 5 and the printing device. As a result, in the winding system, the same effects as those of the above-described winding device can be obtained.

Explanation of Reference Numerals

[0076] 1... Printing and winding system, 2... Printing device, 14... Paper discharge port, 20... Storage unit, 22... Printing unit, 24... Conveying unit, 26... Roll shaft, 40... Platen, 42... Printing head, 50... Conveying roller, 60... Printing-side power transmission mechanism, 70... Winding-side power transmission mechanism, 73... One-way clutch, 90... Lever, 92... Lever roller, 94... Roller shaft, 100... Printing medium, 120... Winding device, 121... Moving opening, 122... Winding drum, 130... Friction part, 132... Friction roller (roller), 134... Roller shaft, 136... One-way clutch, 140... Eccentric cam, C... Conveying direction, F... Force, I... Crossing direction, L, P1, P2... Positions, L1, L2... Path lengths, M... Moment, R... Conveying path, θ... Winding angle, μ... Coefficient of friction.

Claims

1. A take-up shaft around which the printing medium sent from a printing apparatus having a feeding unit for sending the printing medium is wound, a power input unit to which power of the feeding unit is input, a power transmission mechanism that transmits the power input to the power input unit to the take-up shaft, a lever disposed between the printing apparatus and the take-up shaft, and bending the traveling direction of the printing medium in the vertical direction, a friction unit disposed between the printing apparatus and the lever, and applying frictional resistance in contact with the printing medium sent toward the take-up shaft, characterized by comprising: the friction unit not rotating when the take-up shaft rotates in the direction of winding the printing medium, and having a roller provided with a one-way clutch that rotates in the direction of sending the printing medium toward the printing apparatus when the take-up shaft rotates in the direction of feeding out the printing medium a take-up device.

2. The power transmission mechanism transmits the power input to the power input unit to the take-up shaft when the feeding unit sends the printing medium, and does not transmit the power input to the power input unit to the take-up shaft when the feeding unit returns the printing medium The take-up device according to claim 1.

3. The lever is movable between a first position and a second position that bends the traveling direction of the printing medium at an angle shallower than the first position, is biased toward the first position, and the friction unit bends the traveling direction of the printing medium toward the lever by contacting the printing medium The take-up device according to claim 1 or claim 2.

4. The roller is provided so as to be movable in the vertical direction, and includes a roller moving unit that positions the roller at a third position when the take-up shaft rotates in the winding direction, and positions the roller at a fourth position lower than the third position when the take-up shaft rotates in the feeding direction The take-up device according to claim 1 or claim 2.

5. comprises an adjusting unit that adjusts the angle of the roller in the axial direction The take-up device according to claim 1 or claim 2.

6. A printing take-up system comprising the take-up device according to claim 1 or claim 2, and the printing apparatus. ​

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