JP2018172191A - Winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device capable of reducing a cost while decreasing irregularities at an end part of a medium wound in a roll shape.SOLUTION: A winding device includes a winding roller for winding a medium in a roll shape, a dancer roller for applying tension to the medium wound around the winding roller, a stopper for regulating movement in a direction of applying tension to the medium in the dancer roller, and a control unit supplying the medium over a predetermined period corresponding to time for which the dancer roller moves in a predetermined distance to thereby supply the medium even after stopping the movement of the dancer roller by the stopper and cause the medium to be wound around the winding roller in a state in which the medium is slackened from the dancer roller up to the winding roller.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a winding device for winding a long medium into a roll.

  For example, a printing apparatus that prints an image on a long medium generally includes a winding device that winds the printed medium into a roll. Patent Document 1 discloses a technique in which a medium is wound after being slackened by a predetermined amount so as to suppress the winding deviation in the width direction of the medium and align the ends of the medium wound in a roll shape.

JP 2014-76900 A

However, in the apparatus of Patent Document 1, winding control is performed based on whether or not there is a medium between a light emitting unit and a light receiving unit arranged in a direction intersecting the medium conveyance direction. Thus, when the sensor directly detects that the medium has slackened by a predetermined amount, an expensive sensor is required because the distance between the light emitting unit and the light receiving unit is increased.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a winding device that achieves cost reduction while reducing unevenness at the end of a medium wound in a roll shape.

The main invention for achieving the above object is to provide a winding roller for winding a medium in a roll shape, a dancer roller for applying tension to the medium wound around the winding roller, and a tension for the medium in the dancer roller. After stopping the movement of the dancer roller by the stopper by allowing the medium to be supplied over a predetermined period according to the time when the dancer roller has moved a predetermined distance. And a control unit that causes the take-up roller to take up the medium in a state where the medium is supplied and the medium from the dancer roller to the take-up roller is slackened. Take-off device.
Other characteristics of the present invention will be made clear by the description and drawings described later.

  ADVANTAGE OF THE INVENTION According to this invention, the winding apparatus which aimed at cost reduction can be provided, reducing the unevenness | corrugation of the edge part of the medium wound up by roll shape.

1 is a perspective view of a printing apparatus 1. FIG. It is the schematic sectional drawing which looked at the printing apparatus 1 from the side. 2 is a block diagram illustrating a configuration of the printing apparatus 1. FIG. 3 is a perspective view of the winding device 20. FIG. FIG. 6 is a diagram for explaining a winding operation of the medium 2. FIG. 6 is a diagram for explaining a winding operation of the medium 2. FIG. 6 is a diagram for explaining a winding operation of the medium 2. FIG. 6 is a diagram for explaining a winding operation of the medium 2. FIG. 6 is a diagram for explaining a winding operation of the medium 2. FIG. 6 is a diagram for explaining the operation of the winding device 20 in the printing apparatus 1.

[1. Basic configuration of printing device)
FIG. 1 is a perspective view of the printing apparatus 1. FIG. 2 is a schematic cross-sectional view of the printing apparatus 1 as viewed from the side. FIG. 3 is a block diagram illustrating the configuration of the printing apparatus 1.

  As shown in FIG. 2, an original fabric roll 3 in which a long medium 2 such as paper or film is wound in a roll shape is set in the printing apparatus 1. The printing apparatus 1 includes a main body apparatus 10 that prints an image on the medium 2 fed out from the original roll 3 and a winding apparatus 20 that winds the medium 2 on which the image is printed in a roll shape. The printing apparatus 1 has an X direction, a Y direction, and a vertical direction, and the width direction of the medium 3 corresponds to the X direction of the printing apparatus 1.

  The main body device 10 includes a support roller 11 that supports the original fabric roll 3, a conveyance unit 12 that feeds the medium 2 from the original fabric roll 3 and conveys the medium 2 in the Y direction, a printing unit 13, and the entire main body device 10. And a control unit 14 for controlling.

  The transport unit 12 includes a transport roller 121, a pinch roller 122 disposed above the transport roller 121, a transport motor 123 that drives and rotates the transport roller 121, and a motor driver 124 that controls the rotation of the transport motor 123. . The transport roller 121 and the pinch roller 122 rotate with the X direction as an axial direction. The medium 2 is conveyed by the rotation of the rollers 121 and 122 while being sandwiched between the rollers 121 and 122.

  The printing unit 13 includes a print head 131, a carriage 132, and a platen 133. The platen 133 is disposed to face the print head 131 and supports the medium 2 from below. The carriage 132 carries the print head 131 and reciprocates in the X direction by a motor (not shown). The print head 131 is an inkjet head, and ejects ink toward the medium 2 while moving in the X direction together with the carriage 132. The transport roller 121 is arranged on the upstream side of the print head 131, and a part of the peripheral surface is exposed from the upper surface of the platen 133.

  The printing apparatus 1 is a serial type printing apparatus, and an ejection operation (pass) in which ink is ejected while the print head 131 moves in the X direction and a conveyance operation in which the medium 2 is conveyed in the Y direction are alternately performed. Repeated. As a result, an image is printed on the medium 2.

[2. (Configuration of winding device)
FIG. 4 is a perspective view of the winding device 20.
The winding device 20 is a device that winds the printed medium 2 supplied from the main body device 10 in a roll shape by driving the conveyance roller 121. The winding unit 30 and a dancer roller 40 that applies tension to the medium 2. And the stopper 21 for restricting the movement of the dancer roller 40, the first sensor 22 and the second sensor 23 arranged at predetermined intervals on the movement locus of the dancer roller 40, and the entire winding device 20. And a control unit 24.

  As shown in FIG. 2, the winding unit 30 is disposed downstream of the printing unit 13 and below the vertical direction, and drives the winding roller 31 and the winding roller 31 that winds the medium 2 in a roll shape. It has a winding motor 32 that rotates, a motor driver 33 that controls the rotation of the winding roller 31, and a case 34 that houses the winding motor 32. When the winding roller 31 rotates with the X direction as the axial direction, the medium 2 is wound around a paper tube or the like set on the winding roller 31. As shown in FIGS. 1 and 4, the winding motor 32 and the case 34 are arranged on the side in the X direction with respect to the winding roller 31.

  The dancer roller 40 applies tension to the medium 2 wound around the winding roller 31, that is, applies tension to the medium 2 between the transport roller 121 and the winding roller 31, and extends in the X direction. And a pair of arm portions 42 attached to both ends of the roller portion 41, a pair of swing shafts 43 attached to the ends of the pair of arm portions 42, and a detection piece 44.

  The swing shaft 43 is attached to the side plate 4 of the printing apparatus 1 and the case 34 of the winding motor 32 so as to be swingable with the X direction (the width direction of the medium 2) as the axial direction. Therefore, the roller portion 41 and the arm portion 42 can swing around the swing shaft 43. Further, the roller unit 41 and the arm unit 42 are held in a forward tilted posture, that is, inclined to the downstream side (downstream side in the Y direction) where the medium 2 is conveyed by the supply of the medium 2 with respect to the vertical direction. Posture is maintained. Therefore, as the medium 2 is wound around the circumferential surface of the roller unit 41 and the medium 2 is supplied from the upstream side, the roller unit 41 and the arm unit 42 swing downward, and a predetermined amount is applied to the medium 2. Tension is applied. Thereby, the medium 2 is appropriately transported and wound up in a roll shape without loosening.

  The swing range of the roller portion 41 and the arm portion 42 is limited by the pair of stoppers 21 that abut on the arm portion 42. Specifically, the lower stopper 21a of the pair of stoppers 21 regulates the movement of the dancer roller 40 in the direction in which tension is applied to the medium 2 in the dancer roller 40, that is, in the vertical downward direction of the present embodiment. In addition, the dancer roller 40 moves in the direction in which the dancer roller 40 moves when the take-up roller 31 winds up the medium 2 by the upper stopper 21b, that is, in the vertical direction in the present embodiment and upstream in the Y direction. Movement is restricted.

  The detection piece 44 is a member detected by the first sensor 22 and the second sensor 23. As shown in FIG. 4, the detection piece 44, the first sensor 22, and the second sensor 23 are accommodated in a case 34 of the winding motor 32.

  The first sensor 22 includes a first light emitting unit 221 and a first light receiving unit 222 that are arranged to face each other in the X direction. The second sensor 23 also includes a second light emitting unit 231 and a second light receiving unit 232 that are arranged to face each other in the X direction. Specifically, the first light emitting unit 221 and the second light emitting unit 231 are attached to a partition plate 341 in the case 34 of the winding motor 32, and the first light receiving unit 222 and the second light receiving unit 232 are attached to the case 34. It is attached to the side plate 342.

  The detection piece 44 is attached to the swing shaft 43 of the dancer roller 40. Specifically, the detection piece 44 is attached to the swing shaft 43 of the arm portion 42 on the side where the winding motor 32 is disposed in the pair of arm portions 42. Therefore, the detection piece 44 swings together with the swing shaft 43. At this time, the detection piece 44 exists between the first light emitting unit 221 and the first light receiving unit 222, or exists between the second light emitting unit 231 and the second light receiving unit 232.

  As shown in FIG. 3, the control unit 24 of the winding device 20 includes a motor driver 33 of the winding motor 32, a first sensor 22, a second sensor 23, and a motor driver 124 of the transport motor 123 included in the main body device 10. Is communicably connected.

[3. Winding operation of medium 2]
FIGS. 5 to 9 are diagrams for explaining the winding operation of the medium 2 and are schematic cross-sectional views of the winding device 20 as viewed from the side. FIG. 10 is a diagram for explaining the operation of the winding device 20 in the printing apparatus 1. In FIG. 10, the ejection operation in the printing apparatus 1 (main device 10) is represented as “pass”, the transportation operation is represented as “conveyance”, and the time is represented by numbers in squares representing the pass and transportation.

  The control unit 24 of the winding device 20 supplies the medium 2 even after the dancer roller 40 has stopped swinging (moving) by the stopper 21, thereby loosening the medium 2 from the dancer roller 40, and the winding roller 31. The medium 2 is wound up. By doing so, the unevenness | corrugation of the edge part of the medium 2 wound up by roll shape can be reduced.

  For this purpose, the control unit 24 determines whether the dancer roller 40 swings a predetermined angle (angle θ in FIG. 7) and moves a predetermined distance in the vertical direction (L in FIG. 7). The medium 2 is supplied even after the downward movement of the dancer roller 40 by 21a is stopped.

Hereinafter, a specific winding operation of the medium 2 will be described.
First, as shown in FIG. 5, the first sensor 22 detects a detection piece 44 that is a part of the dancer roller 40. Specifically, the detection piece 44 exists between the first light emitting unit 221 and the first light receiving unit 222, and the light emitted from the first light emitting unit 221 is blocked by the detection piece 44. Then, the control unit 24 of the winding device 20 communicates with the motor driver 124 for the transport roller 121 included in the main body device 10, and counts when the transport roller 121 is driven or the transport roller 121 starts driving ( Time measurement) starts. As described above, the control unit 24 counts the time while the medium 2 is being transported, that is, while the transport roller 121 is being driven, and does not count the time when the transport roller 121 is stopped.

  Referring to FIG. 10, the first sensor 22 detects the detection piece 44 during the pass 1 of the print job 1. Therefore, the control unit 24 starts counting at the start of the conveyance 1 after the pass 1.

  As the medium 2 is supplied from the main body device 10 by driving the transport roller 121, the dancer roller 40 swings about the swing shaft 43 and moves downward as shown in FIG. The first sensor 22 is in a non-detection state of the detection piece 44.

  Thereafter, as shown in FIG. 7, the second sensor 23 detects the detection piece 44. Specifically, the detection piece 44 exists between the second light emitting unit 231 and the second light receiving unit 232, and the light emitted from the second light emitting unit 231 is blocked by the detection piece 44. If it does so, the control part 24 will acquire the time after starting a count. That is, the control unit 24 acquires time T (hereinafter also referred to as “reference time”) from when the first sensor 22 detects the detection piece 44 to when the second sensor 23 detects the detection piece 44.

  Further, the control unit 24 calculates a time 4T (hereinafter, also referred to as “predetermined multiple time”) that is a predetermined multiple of the reference time T, here four times. Further, the control unit 24 keeps counting even after the second sensor 23 detects the detection piece 44.

  Referring to FIG. 10, the second sensor 23 detects the detection piece 44 after the end of the conveyance 2 of the print job 1 (when the count is 2). Therefore, the control unit 24 acquires the reference time T as “2” and calculates the predetermined multiple time 4T as “8”.

  Thereafter, as the medium 2 is supplied from the main body device 10, the dancer roller 40 swings downward, and when the arm portion 42 of the dancer roller 40 comes into contact with the lower stopper 21a as shown in FIG. Then, the downward swing of the dancer roller 40 stops. In FIG. 10, the swing of the dancer roller 40 is stopped during the conveyance 3 of the print job 1.

  Even after the swing of the dancer roller 40 by the lower stopper 21a is stopped, the control unit 24 causes the main body device 10 to supply the medium 2 without causing the take-up roller 31 to take up the medium 2. Then, as shown in FIG. 9, the medium 2 is loosened from the dancer roller 40. In addition, after the medium 2 is loosened from the dancer roller 40, the amount of the medium 2 that descends from the platen 133 is increased, so that tension is applied to the medium 2 due to its own weight.

  Then, the control unit 24 causes the take-up roller 31 to take up the medium 2 when the predetermined multiple time 4T has elapsed since the start of counting. However, it is preferable not to perform the winding operation of the medium 2 simultaneously with the conveying operation of the medium 2 in order to prevent the conveyance error of the medium 2.

  Referring to FIG. 10, during the conveyance 3 of the print job 2, a predetermined double time 4T has elapsed from the start of the count (count 8). Therefore, when the pass 4 after the conveyance 3 starts, the control unit 24 drives the winding roller 31 to wind the medium 2 on the winding roller 31.

  Then, as the take-up roller 31 winds up the medium 2, the slack of the medium 2 from the dancer roller 40 decreases, and when the slack of the medium 2 disappears, the dancer roller 40 swings upward, that is, supply of the medium 2. Swing to the side.

  Then, as shown in FIG. 5, when the dancer roller 40 returns to a position where the first sensor 22 detects the detection piece 44, the control unit 24 stops driving the winding roller 31. At this time, the dancer roller 40 is inclined to the downstream side (downstream side in the Y direction) where the medium 2 is conveyed by the supply of the medium 2 with respect to the vertical direction. Thereafter, the control unit 24 again counts the time during the conveyance of the medium 2.

  In addition, said winding operation | movement is an example and is not limited to said thing. For example, the count may be reset after the reference time T is acquired (after the detection piece 44 is detected by the second sensor 23), and a new count may be started. Alternatively, the medium 2 may be wound up until the arm portion 42 of the dancer roller 40 contacts the upper stopper 21b.

  Further, in the design process of the printing apparatus 1 and the like, a predetermined time (here, based on the amount of the medium 2 conveyed during the reference time T and the desired amount of the medium 2 to be loosened from the dancer roller 40 during winding) Then, it is preferable to determine 4 times the reference time T). The desired amount of the medium 2 that is desired to be loosened from the dancer roller 40 is a value that is previously held as a design value. For example, the medium 2 does not reach the floor, and the positional deviation in the width direction of the medium 2 can be restored. Amount. As described above, the desired amount of the medium 2 that is desired to be loosened from the dancer roller 40 is a value that is previously held as a design value, and the dancer roller 40 can be calculated without calculating the speed of the dancer roller 40 or the amount of slackness of the medium 2. Since it can be calculated from only the travel time, slack can be set easily.

  Preferably, the predetermined time is set to a time longer than twice the reference time T. By doing so, the medium 2 can be wound up in a state where the medium 2 is loosened from the dancer roller 40 more reliably.

  In addition, there may be a slight characteristic difference in the transport operation of the medium 2 between the state where the dancer roller 40 applies tension to the medium 2 and the state where the medium 2 is loose from the dancer roller 40. Therefore, the predetermined time is set to 3 to 4 times the reference time T, the time during which the dancer roller 40 applies tension to the medium is shortened, and the time during which the medium 2 is slack from the dancer roller 40 is lengthened. By doing so, the difference in image quality due to the difference in the transport operation of the medium 2 can be made inconspicuous, and the image quality can be improved.

  Further, the winding device 20 may have only the “slack winding mode” in which the medium 2 is wound in the state where the medium 2 is slackened from the dancer roller 40 as described above. However, in addition to the slack winding mode, there is a “normal winding mode” in which the medium 2 is wound while the medium 2 from the dancer roller 40 to the winding roller 31 is tensioned. You may comprise so that switching is possible with a switch. When the normal winding mode is set, the medium 2 is supplied with the printing, the dancer roller 40 moves downward in conjunction with the printing, and the dancer roller 40 hits the first sensor 22 or the second sensor 23, The control unit 24 may cause the take-up roller 31 to take up the medium 2. By doing so, the normal winding mode can be implemented using the first sensor 22 and the second sensor 23 used in the slack winding mode, and can be realized with a simple configuration.

[4. (Modification)
In the above embodiment, the first sensor 22 and the second sensor 23 are arranged in the swing range of the dancer roller 40. However, the present invention is not limited to this. For example, a rotary encoder is provided on the swing shaft 43 of the dancer roller 40, and the arm unit 42 swings a predetermined angle based on the rotary encoder, that is, the dancer roller 40 moves a predetermined distance. You may make it acquire time.

  In the above embodiment, the dancer roller 40 swings in the X direction (paper width direction) in the axial direction. However, the present invention is not limited to this. For example, the dancer roller may move in the vertical direction by a pinion rack type or the like, and the medium 2 may be loosened according to the time for which the dancer roller moves a predetermined distance in the vertical direction.

[5. effect〕
According to the embodiment of the present invention as described above, the following effects can be obtained.
(1) The control unit 24 of the winding device 20 supplies the medium 2 over a predetermined period (the above-mentioned predetermined multiple time, for example, 4T) according to the time when the dancer roller 40 has moved a predetermined distance. Even after the movement of the dancer roller 40 in the direction in which tension is applied to the medium 2 by the stopper 21 (lower stopper 21a) is stopped, the medium 2 is supplied and the medium 2 from the dancer roller 40 to the take-up roller 31 is loosened. In the state, the medium 2 is wound on the winding roller 31. The supply of the medium 2 over a predetermined period may be not only when the medium 2 is continuously supplied, but also when the supply and stop of the medium 2 are repeated. It is sufficient that the total is within a predetermined period.

  The dancer roller 40 moves as the medium 2 is supplied. Therefore, for example, if the time during which the dancer roller 40 has moved a predetermined distance is long (that is, if the speed of the dancer roller 40 is slow), the time during which the predetermined amount of the medium 2 is conveyed is long, and the predetermined amount of the medium 2 is The time to relax from 40 also becomes longer. Therefore, the control unit 24 is in a state where the medium 2 is loose from the dancer roller 40 according to the time that the dancer roller 40 has moved a predetermined distance (that is, the speed of the dancer roller 40 that moves the predetermined distance). I can guess if there is. Therefore, the control unit 24 determines the winding timing according to the time, so that the winding roller 31 can wind the medium 2 while the medium 2 is loosened from the dancer roller 40.

  Thus, by loosening the medium 2 before winding the medium 2 into a roll shape, the positional deviation in the width direction of the medium 2 can be restored, and the unevenness at the end of the medium 2 wound in the roll shape can be reduced. Can be reduced. Note that, when the winding of the medium 2 is completed, the slack of the medium 2 is eliminated.

  In the present invention, the sensor detects that the dancer roller 40 has moved a predetermined distance. Therefore, for example, compared with the case where the sensor directly detects the medium 2 slacking a predetermined amount from the dancer roller 40, the distance between the light emitting unit and the light receiving unit can be reduced, and the cost of the sensor can be reduced.

  Further, for example, when calculating that the medium 2 is loosened by a predetermined amount from the dancer roller 40 by accumulating the transport amount for each transport operation of the medium 2, the control unit 24 of the winding device 20 causes the main body device 10. It is necessary to communicate with the control unit 14 in detail information relating to the print job. Since this is not necessary in the present invention, the configuration of the control unit 24 can be simplified, and the cost of the control unit 24 can be reduced.

  In the present invention, there may be some variation in the amount of the medium 2 that loosens from the dancer roller 40 during winding. However, if the medium 2 is wound from the dancer roller 40 in a slack state, the unevenness at the end of the medium 2 wound in a roll shape can be reduced. Therefore, as described above, there is no problem even if the sensor does not directly detect that the predetermined amount of the medium 2 is loose from the dancer roller 40. That is, in order to return the positional deviation in the width direction of the medium 2 at the time of winding, precise management of the amount of slack is not necessary, and it is sufficient if there is a certain amount of slack. Therefore, if the speed of the dancer roller 40 (the conveyance speed of the medium 2 and the winding speed of the medium 2) is increased, the required amount of slack (the time for generating the slack) decreases, and the speed of the dancer roller 40 (the conveyance of the medium 2). If the speed and the winding speed of the medium 2 are reduced, the necessary amount of slack (the time for generating slack) increases. Therefore, the necessary amount of slack is estimated from the moving time of the medium that moves a predetermined distance.

(2) The controller 24 of the winding device 20 detects the dancer roller 40 moved to the second sensor 23 side by the supply of the medium 2 after the first sensor 22 detects the dancer roller 40. By measuring the time (the above-mentioned reference time T) until the start and supplying the medium 2 over a predetermined period (the above-mentioned predetermined double time, for example, 4T) corresponding to the time, the dancer roller 40 to the take-up roller The medium 2 up to 31 is loosened.

  Thus, by arranging the first sensor 22 and the second sensor 23 in the range in which the dancer roller 40 moves (swings), the control unit 24 can acquire the time when the dancer roller 40 has moved a predetermined distance.

  (3) Not limited to the above, the control unit 24 of the winding device 20 has a time from when the first sensor 22 detects the dancer roller 40 to when the second sensor 23 detects the dancer roller 40 (the reference time described above). T) and the length (L) of the medium 2 conveyed during the time (T), the conveyance speed (L / T) of the medium 2 is calculated, and the medium 2 is loaded on the winding roller 31. The time (Tn) obtained by dividing the desired amount (S) of the medium 2 to be loosened from the dancer roller 40 when winding is divided by the conveyance speed (L / T) of the medium 2, that is, the time required for the formation of slack (Tn = According to (S × T / L), the medium 2 from the dancer roller 40 to the take-up roller 31 may be slackened.

  Note that the length L of the medium 2 conveyed while the dancer roller 40 moves from the first sensor 22 to the second sensor 23 and the desired amount S of the medium 2 to be loosened are designed by the winding device 20. It is assumed that the value has in advance.

  Specifically, the control unit 24 may cause the take-up roller 31 to take up the medium 2 after elapse of time Tn necessary for forming slackness after the second sensor 23 detects the dancer roller 40.

  However, strictly speaking, the slack of the medium 2 is not generated for a minute time Tm from when the second sensor 23 detects the dancer roller 40 until the dancer roller 40 is stopped by the lower stopper 21a. Therefore, the control unit 24 causes the take-up roller 31 to take up the medium 2 after a lapse of a minute time Tm and a time Tn necessary for forming slackness after the second sensor 23 detects the dancer roller 40. May be. The minute time Tm can be calculated from the length of the medium 2 conveyed while the dancer roller 40 moves from the second sensor 23 to the stopper 21a below and the conveyance speed (L / T) of the medium 2.

  Also in these cases, the medium 2 can be taken up by the take-up roller 31 in a state where the medium 2 of a desired amount or a quantity close thereto is loosened from the dancer roller 40. Therefore, the unevenness | corrugation of the edge part of the medium 2 wound up by roll shape can be reduced.

  (4) As shown in FIG. 4, the detection piece 44, the first sensor 22, and the second sensor 23 of the dancer roller 40 are placed in a case 34 that houses a winding motor 32 that drives the winding roller 31. Contained.

  By doing so, it can prevent that detection piece 44 grade | etc., Touches a wearer, and is damaged and gets dirty, and the fall of detection accuracy can be prevented. In addition to the case 34 for housing the winding motor 32, the number of members can be reduced and the cost can be reduced as compared with the case of providing a case for covering the detection piece 44 and the like.

  (5) The detection piece 44 is provided coaxially with the swing shaft 43 of the dancer roller 40 and swings together with the swing shaft 43.

  By doing so, for example, compared with the case where the detection piece 44 is attached to the swing shaft 43 via a gear, the control unit 24 is the time when the dancer roller 40 has moved a predetermined distance, that is, a predetermined amount of the medium 2. It is possible to accurately measure the time when the is conveyed. Therefore, the control unit 24 can accurately estimate that the medium 2 is loose from the dancer roller 40.

  (6) When the first sensor 22 detects the dancer roller 40 (detection piece 44) swinging toward the first sensor 22 by driving the winding roller 31, the control unit 24 of the winding device 20 takes up the winding roller 31. Stop driving.

  By doing so, after winding the medium 2 by the winding roller 31, the first sensor 22 can detect the dancer roller 40 (detection piece 44) again, so that the time when the dancer roller 40 has moved a predetermined distance is repeatedly measured. it can. Further, for example, a sensor that detects that the dancer roller 40 swings upward, that is, a sensor that notifies the timing of stopping the driving of the take-up roller 31 is less expensive than the case where a sensor is provided separately from the first sensor 22. Can be realized.

  (7) Moreover, as shown in FIG. 5, when the 1st sensor 22 detects the dancer roller 40, the dancer roller 40 (arm part 42) is a forward leaning posture, and is perpendicular | vertical (dotted line in FIG. 5). On the other hand, it is assumed that the medium 2 is inclined to the downstream side (downstream side in the Y direction) when the medium 2 is fed.

  By doing so, after the medium 2 is taken up by the take-up roller 31, the dancer roller 40 can swing downward again as the medium 2 is supplied, and tension can be applied to the medium 2.

  (8) The control unit 24 of the winding device 20 does not count the time during which the dancer roller 40 moves a predetermined distance while the transport roller 121 that supplies the medium 2 to the winding device 20 is stopped.

  By doing so, printing is performed during measurement of the time during which the dancer roller 40 travels a predetermined distance (reference time T) or while the medium 2 is loosened from the dancer roller 40 (during measurement of the predetermined double time 4T). Even if the time of the ejection operation (pass) is changed after the job is switched or the printing is stopped due to maintenance or the like, the control unit 24 is not affected by them, and the medium 2 is loosened from the dancer roller 40. I can guess the state.

  For example, in FIG. 10, if the time is counted even while the transport roller 121 is stopped, the reference time T is 4 and the predetermined double time 4T is 16. In this case, the print job is switched halfway, and the pass time becomes longer. Therefore, the predetermined double time 4T is reached in pass 2 of the print job 2. Also in this case, the medium 2 is wound in a state where the medium 2 is loosened from the dancer roller 40, but is wound at a timing earlier than in the above-described embodiment.

  Therefore, by not counting the time while the transport roller 121 is stopped, the medium 2 can be taken up in a state where the desired amount or the amount of the medium 2 is loose from the dancer roller 40. Therefore, the unevenness | corrugation of the edge part of the medium 2 wound up by roll shape can be reduced more reliably.

  Further, as described above, it is preferable that the transport operation and the winding operation of the medium 2 are not performed simultaneously in order to prevent the transport error of the medium 2. Therefore, the control unit 24 of the winding device 20 needs to communicate with the main body device 10 regarding whether or not the transport roller 121 is driven. Since this information can be used so that the time is not counted while the transport roller 121 is stopped, the configuration of the control unit 24 can be realized without complicating the configuration.

  As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

  In the above-described embodiment, a serial type ink jet printing apparatus is illustrated as the printing apparatus 1, but is not limited thereto. For example, a full line type using a head that is long in the width direction of the medium 2 or a photosensitive or thermal transfer type printing apparatus may be used.

  In the above embodiment, the winding apparatus 20 is provided in the printing apparatus 1, but is not limited thereto. For example, a winding device for various devices that process a long medium, such as a cutting device that cuts a medium into a desired shape, or a printing / cutting device that prints an image on a medium and cuts the periphery of the image. 20 can be provided or connected.

DESCRIPTION OF SYMBOLS 1 ... Printing apparatus, 2 ... Medium, 3 ... Raw material roll,
10 ... Main unit, 11 ... Support roller,
12 ... Conveying unit, 121 ... Conveying roller, 122 ... Pinch roller,
123 ... Conveyance motor, 124 ... Motor driver,
13: Printing section, 131: Print head, 132: Carriage,
133 ... Platen, 14 ... Control part,
20 ... Winding device, 21 ... Stopper,
21a ... lower stopper (stopper), 21b ... upper stopper,
22 ... 1st sensor, 221 ... 1st light emission part, 222 ... 1st light-receiving part,
23 ... 2nd sensor, 231 ... 2nd light emission part, 232 ... 2nd light-receiving part,
24 ... control unit,
30 ... winding portion, 31 ... winding roller, 32 ... winding motor (motor),
33 ... Motor driver, 34 ... Case,
40 ... dancer roller, 41 ... roller part,
42 ... arm portion, 43 ... oscillating shaft, 44 ... detection piece

Claims (8)

A winding roller for winding the medium into a roll;
A dancer roller that applies tension to the medium wound around the winding roller;
A stopper for restricting movement of the dancer roller in a direction in which tension is applied to the medium;
By supplying the medium over a predetermined period according to the time when the dancer roller has moved a predetermined distance, the medium is supplied even after the movement of the dancer roller by the stopper is stopped, and the dancer roller And a control unit that causes the winding roller to wind the medium in a state where the medium up to the winding roller is slackened. The winding device according to claim 1,
A first sensor and a second sensor arranged on the movement path of the dancer roller at a predetermined interval;
The control unit measures a time from when the first sensor detects the dancer roller to when the second sensor detects the dancer roller that has moved to the second sensor side by supplying the medium, A winding device characterized in that the medium from the dancer roller to the winding roller is loosened by supplying the medium over the predetermined period corresponding to the time. The winding device according to claim 1,
A first sensor and a second sensor arranged on the movement path of the dancer roller at a predetermined interval;
The controller is
The time from when the first sensor detects the dancer roller to the time when the second sensor detects the dancer roller that has moved to the second sensor side due to the supply of the medium, and is conveyed during that time. Calculating the transport speed of the medium according to the length of the medium,
A winding apparatus characterized by loosening the medium from the dancer roller to the winding roller according to a time obtained by dividing a desired amount of the medium to be loosened from the dancer roller by the transport speed. The winding device according to claim 2 or 3, wherein
A motor for driving the winding roller, and a case for accommodating the motor;
The dancer roller has a detection piece detected by the first sensor and the second sensor,
The winding device, wherein the detection piece, the first sensor, and the second sensor are accommodated in the case. The winding device according to claim 4,
The dancer roller swings around a swing axis along the width direction of the medium,
The said detection piece is provided coaxially with the said rocking | fluctuation shaft of the said dancer roller, and rock | fluctuates with the said rocking | fluctuation shaft, The winding apparatus characterized by the above-mentioned. The winding device according to any one of claims 2 to 5,
The dancer roller swings around a swing axis along the width direction of the medium,
The control unit stops driving of the winding roller when the first sensor detects the dancer roller swinging toward the first sensor by driving of the winding roller. . The winding device according to claim 6,
When the first sensor detects the dancer roller, the dancer roller is inclined to the downstream side where the medium is conveyed by the supply of the medium with respect to the vertical direction. . The winding device according to any one of claims 1 to 7,
The said control part does not count the time when the said dancer roller moves the said predetermined distance during the stop of the conveyance roller which supplies the said medium to the said winding apparatus, The winding apparatus characterized by the above-mentioned.

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