JP2018034928A - Taking-up control method, and taking-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slack when taking up a printed medium and to prevent peeling of an adhesive tape.SOLUTION: A control part 70 measures a pulse number from an encoder 57, and so keeps an electric current of a powder clutch 55 via a powder clutch current control part 71 as to be a minimum current value according to a paper kind of a long paper 16a until the pulse number reaches a pulse number equivalent to rotation of about two laps of a rewinder rotary shaft 52. Thereafter, when the pulse number reaches the pulse number equivalent to rotation of about two laps of the rewinder rotary shaft 52, the control part 70 so sets an electric current of a powder brake 55 via the powder clutch current control part 71 as to be a usual current value according to a paper kind of the long paper 16a so that a tensile force becomes an original holding power of a printer body 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a winding control method and a winding device.

  Conventionally, there is an electrophotographic image forming apparatus. In this image forming apparatus, the photosensitive drum of the developing device is uniformly charged and initialized, a latent image is formed on the photosensitive drum by optical writing, and the latent image is converted into a toner image (development). The toner image is directly or indirectly transferred to a printing medium and fixed by a fixing device.

  2. Description of the Related Art Conventionally, in the image forming apparatus, for example, a public notice or the like is continuously printed on a long paper wound in a roll shape, and the long paper after printing is wound on a take-up shaft (paper tube). In this case, on the winding side, at the start of winding, after fixing the leading end of the long paper to the winding shaft (paper tube) using an adhesive tape or the like, printing and winding are started (for example, Patent Document 1). reference).

JP, 2015-121734, A

  However, the above-described image forming apparatus winds up a long paper after printing in the case of a thick long paper wound in a roll shape, for example, a long paper having a label formed on a mount. In this case, since a larger tension is required during winding, the following new problem arises.

(1) When winding is started with a large tension at the start of winding, the adhesive tape that fixes the leading edge of the long paper is detached, and the long paper is detached from the winding shaft (paper tube).
(2) If an adhesive tape with strong adhesive strength is used to prevent the adhesive tape from coming off, when the wound long paper is unwound to a subsequent device, the long paper fixed with the adhesive tape Problems such as tearing when the edge is opened or breaking of the unwinding device due to failure to open.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent sagging at the time of winding a printing medium, to prevent the adhesive tape that fixes the front end of the printing medium from coming off, and the failure of a device that unwinds the printing medium.

  A winding control method according to the present invention is a winding control method for winding a printing medium around a winding shaft in a roll shape, and the torque of the winding shaft at the start of winding of the printing medium is The adjustment is made according to the paper type of the printing medium.

  The winding device according to the present invention is a winding device that winds a printing medium around a winding shaft in a roll shape, and the torque of the winding shaft at the start of winding of the printing medium is determined by the winding material. An adjustment unit that adjusts according to the paper type of the medium is provided.

  According to the present invention, it is possible to prevent sagging at the time of winding the printing medium, to prevent the adhesive tape that fixes the front end of the printing medium from being detached, and the failure of the device that unwinds the printing medium.

1 is an overall conceptual diagram of an image forming apparatus 10 for printing on long paper (a printing medium) according to an embodiment of the present invention. 2 is a side view illustrating a configuration of a winding device 50 of the image forming apparatus 10 according to the present embodiment. FIG. FIG. 3 is a perspective view showing a method for fixing the long paper 16a to the take-up shaft (paper tube) of the image forming apparatus 10 according to the present embodiment. 2 is a block diagram illustrating a partial configuration of a control system of the image forming apparatus 10 according to the present embodiment. FIG. 5 is a flowchart for explaining an operation (winding process) of the image forming apparatus 10 according to the present embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A. Configuration of Embodiment FIG. 1 is an overall conceptual diagram of an image forming apparatus 10 for printing on a long paper (print medium) wound around a paper tube in a roll shape according to an embodiment of the present invention. In FIG. 1, the image forming apparatus 10 includes a long paper holding unit (paper feed roll holding unit) 15, a printer main body (engine: image forming unit) 30, and a winding device 50. The long paper holding unit 15 is installed in the lower part of the printer main body 30, and a paper feed roll 16 fitted to the unwinder shaft 20 is installed. More specifically, the paper feed roll 16 is composed of a long paper 16a wound around a paper tube (core), and the paper roll (winding core) is fitted to the unwinder shaft 20 so as to be long. It is installed in the paper holding unit 15.

  The paper feed roll 16 is held rotatably about the unwinder shaft 20 as a rotation axis. The unwinder shaft 20 is not provided with a driving means (such as a motor), and rotates when the long paper 16 a is pulled out from the paper supply roll 16 by the transport roller in the printer main body 30. The paper guide roller 17 changes the conveyance direction of the long paper 16 a pulled out from the paper supply roll 16 and guides it to be conveyed toward the upper printer body 30.

  A powder brake 28 is installed in the drive system of the unwinder shaft 20 to which the paper feed roll 16 is fitted. The powder brake 28 controls the cohesive force of the magnetic material according to a control current from a control system (not shown), applies a predetermined brake to the rotation of the paper feed roll 16, and controls the load tension of the paper. Further, the unwinder shaft 20 is provided with an encoder (not shown) that detects the rotation of the unwinder shaft 20.

  The edge sensor 18 is disposed between the paper guide roller 17 and a paper guide roller 19 to be described later, and detects the positions of both ends in the paper width direction perpendicular to the conveying direction of the long paper 16 a pulled out from the paper supply roll 16. The skew of the long paper 16a is detected. Although one end sensor 18 is shown in FIG. 1, it is actually disposed at each end of the long paper 16a.

  The paper guide roller 19 changes the transport direction of the long paper 16 a that has passed through the end sensor 18 and guides the transport to the upper printer body 30. The paper transport rollers 21 and 23 sandwich the long paper 16 a fed from the paper feed roll 16 from both sides and transport it toward the upper printer body 30. Each of the sheet transport rollers 21 and 23 includes a clutch mechanism in at least one of the pair. When the clutch mechanism is turned on, the driving force of the rotating shaft is transmitted to the roller, and when it is turned off, the driving force from the rotating shaft is cut off and driven.

  At the start of printing, when the long paper 16a is transported into the printer main body 30 and is sandwiched between transport rollers in the printer main body 30 (main body entrance transport roller 47 described later), the driving force of the paper transport rollers 21 and 23 is applied. OFF (disengage the clutch). After the driving force of the paper transport rollers 21 and 23 is turned off, the long paper 16a is transported within the printer body 30 (main body entrance transport roller 47, secondary transfer backup roller 41 and secondary transfer roller 42 described later). , A roller in the fixing device 36). The paper transport rollers 21 and 23 are driven by the transported long paper 16a.

  The auto cutter 22 cuts the long paper 16a when the paper feed roll 16 is installed for the first time to feed the long paper 16a or when printing is completed. The paper passage sensor 24 detects the passage of the leading edge or the trailing edge of the long paper 16a conveyed to the printer main body 30.

  As described above, the long paper 16 a drawn from the paper feed roll 16 passes under the paper guide roller 17 from the unwinder 25 and passes through the paper guide roller 19, the paper transport roller 21, the auto cutter 22, and the paper transport roller 23. Then, the paper is fed to the printer main body 30.

  The printer main body 30 is an electrophotographic tandem color image forming apparatus of an intermediate transfer system, and includes a drum / developing device 31, a transfer belt device 32, a toner cartridge 33, an electrical unit 34, a paper feeding unit 35, and a fixing device. 36 or the like.

  A toner cartridge 33 is disposed above the transfer belt device 32, and a drum / developing device 31 is disposed substantially immediately below the transfer belt device 32. The transfer belt device 32 includes an intermediate transfer belt 37, a driving roller 38, and a driven roller 39. The drum / developing device 31 is configured by contacting four lower developing devices 31k, 31c, 31m, and 31y in a multi-stage manner in contact with the lower running surface of the intermediate transfer belt 37 of the transfer belt device 32 from the right to the left in FIG. Is done. The developing devices 31k, 31c, 31m, and 31y include four toner cartridges 33, and black (K), cyan (C), magenta (M), and yellow (Y) indicated by K, C, M, and Y in FIG. ) Toner is supplied. A fixed amount of toner is conveyed from the toner cartridge 33 into the drum / developing device 31.

  The drum / developing device 31 includes four developing devices 31k, 31c, 31m, and 31y arranged in a multistage manner. Each of the developing devices 31k, 31c, 31m, and 31y has the same configuration except for the color of the toner that develops the image. The three developing devices 31c, 31m, and 31y on the upstream side (the left side in the figure) respectively transfer color images with cyan (C), magenta (M), and yellow (Y) color toners, which are three subtractive primary colors, as intermediate transfer belts. The developing device 31k forms on the intermediate transfer belt 37 a monochrome image using black (K) color toner mainly used for dark portions of characters and images.

  The long paper 16 a is pressed against the intermediate transfer belt 37 when being transported between the secondary transfer backup roller 41 and the secondary transfer roller 42. As a result, on the long paper 16a, a color image formed with the cyan (C), magenta (M), and yellow (Y) color toner and a monochrome image formed with the black (K) toner formed on the intermediate transfer belt 37 are formed. The images are sequentially transferred and supplied to the fixing device 36.

  The fixing device 36 is a belt-type heat fixing device, and fixes the toner image transferred to the long paper 16a. The long paper 16 a carried out from the fixing device 36 is taken up by a take-up shaft (paper tube) 51 of the take-up device 50 via the face-up unit 45.

  FIG. 2 is a side view showing the configuration of the winding device 50 of the image forming apparatus 10 according to the present embodiment. In the winding device 50, a paper tube 51 that winds roll paper is detachably fixed to a rewinder rotating shaft 52. The rewinder rotating shaft 52 is rotated by the rotational force of the rewinder driving motor 56 transmitted through the powder clutch 55 by belts / gears 53 and 54 and the like. The powder clutch 55 has a rewinder drive motor 56 connected to its input shaft and a rewinder rotary shaft 52 connected to one output shaft.

  The powder clutch 55 controls the cohesive force of the magnetic material according to a control current from a control system (not shown), and maintains the tension of the long paper 16a from the rewinder drive motor 56 to the rewinder rotary shaft 52. Controls the driving force (transmission torque) transmitted. That is, the transmission torque from the input shaft to the output shaft of the powder clutch 55 can be adjusted by the current value supplied to the powder clutch 55. The larger the current value, the more the slippage between the output shaft and the input shaft. The torque is reduced and the torque transmitted to the output shaft is increased.

  More specifically, the driving force of the driving source applied to the input shaft of the powder clutch 55 is coupled with a transmission torque corresponding to the electrical control of the powder clutch 55, and the rotational driving force beyond that is connected to the powder clutch 55. Is not transmitted due to slipping. Therefore, the rewinder rotary shaft 52 is controlled to rotate in accordance with the conveyance speed of the long paper 16a determined by the printer main body 30, and the tension of the long paper 16a to be wound can be arbitrarily adjusted. It has become.

  Further, the rewinder rotary shaft 52 includes an encoder 57 for detecting the rotation of the rewinder rotary shaft 52. The encoder 57 detects the presence / absence of rotation of the rewinder rotary shaft 52 and the rotation speed. The encoder 57 is fixed in the vicinity of the rotary plate provided on the shaft of the rewinder rotary shaft 52, detects the passage of the slit on the rotary plate that rotates with the rotation of the shaft, and rotates the rotational speed of the rewinder rotary shaft 52. That is, a pulse signal having a cycle corresponding to the conveyance speed of the long paper 16a and the roll diameter of the long paper 16a wound around the paper tube 51 is output.

FIG. 3 is a perspective view showing a method for fixing the long paper 16a to the take-up shaft (paper tube) of the image forming apparatus 10 according to the present embodiment. At first, the user manually attaches the leading end of the long paper 16 a discharged from the printer main body 30 to the paper tube 51 attached to the rewinder rotating shaft 52 with the adhesive tape 60. Thereafter, the long paper 16a conveyed in the B direction is automatically wound on the paper tube 51.
When the leading end of the long paper 16a is attached to the paper tube 51 with the adhesive tape 60, the paper tube 51 has a length of excess paper that causes the slack of the long paper 16a discharged from the printer main body 30. The length should be short enough to ensure that the sheets overlap when rotated.

  Here, in general, if the paper is not wound around the paper tube 51 while being pulled, the paper tube 51 cannot be wound up neatly, and the paper is misaligned and rolled due to handling of the rolled paper after winding. Since the misalignment of the shape is likely to occur, the tension on the outer diameter of the long paper 16a wound around the paper tube 51 in a roll shape is a length necessary for winding the roll into a roll shape without causing the miswinding. As described above, the current value of the powder clutch 55 is adjusted so that an appropriate tension corresponding to the type of the paper 16a is obtained. That is, generally, the long paper 16a is wound from the start of winding to the end of winding with a tension such that the wound roll paper does not cause winding deviation.

  Further, since the tension necessary for properly winding the wide long paper 16a is relatively large, the torque transmitted by the powder clutch 55 is correspondingly large. However, when this large tension is also applied to the beginning of winding as shown in FIG. 3, the tension of the long paper 16a is applied to the adhesive tape 60 to which the long paper 16a is stuck, and the holding force due to the adhesion. As a result, the adhesive tape 60 is peeled off, and the long paper 16 a is detached from the paper tube 51 as a result.

  In particular, in the case where the long paper 16a is thick and slippery paper having a label formed on the mount, in order to maintain an appropriate predetermined tension that does not cause the long paper 16a to be wound, a powder is used. The transmission torque of the clutch 55 has to be increased, and the long paper 16a is pulled more strongly, so that the adhesive tape 60 is peeled off and is easily detached from the paper tube 51.

Therefore, in the present invention, using the encoder 57 attached to the rewinder rotary shaft 52, first, when there is no encoder pulse from the encoder 57, that is, when the rewinder rotary shaft 52 is stopped, the current of the powder clutch 55 is reduced. Is set to a small value (a current value sufficient to take up the long paper 16a that has come out of the printer main body 30 and the adhesive tape 60 does not peel off, hereinafter referred to as a minimum current value). At this time, the minimum current value investigated in advance is set according to the paper type of the long paper 16a (type of printing medium such as paper quality, paper thickness, paper width, etc.).
That is, the current of the powder clutch 55 is set so as to increase the transmission torque of the powder clutch 55 as the paper type has a higher bending rigidity of the long paper 16a with respect to the winding around the paper tube 51.

  Here, when the conveyance of the long paper 16a is started, the rewinder rotary shaft 52 starts to rotate, so that the generation of the encoder pulse from the encoder 57 is detected. From this time point, the number of pulses is measured, and the current of the powder clutch 55 is set to the minimum current corresponding to the type of the long paper 16a until reaching the number of pulses corresponding to the rotation of the rewinder rotary shaft 52 about two revolutions. Keep the value. In other words, the minimum current value is a current value smaller than the current of the powder clutch 55 necessary to maintain an appropriate predetermined tension that does not cause the winding of the long paper 16a.

  The fact that the rewinder rotary shaft 52 has rotated about two rounds means that the long paper 16 a wound around the paper tube 51 overlaps, and the long paper 16 a fastened to the paper tube 51 with the adhesive tape 60. The long paper 16a is restrained by the wound long paper 16a, and the possibility that the long paper 16a is detached from the paper tube 51 is eliminated. In other words, during the period in which the paper tube 51 rotates twice, the torque transmitted by the powder clutch 55 is set to the minimum setting that allows the long paper 16a to be wound without sagging, and the long paper 16a is wound around the paper tube 51. . In other words, during the period in which the paper tube 51 rotates twice, the torque transmitted by the powder clutch 55 is greater than the torque of the powder clutch 55 required to maintain an appropriate predetermined tension that does not cause the long paper 16a to be wound. The long paper 16a is wound around the paper tube 51 with a small torque setting.

  And, when the number of pulses corresponding to about two rotations of the rewinder rotating shaft 52 is reached, an appropriate tension necessary for winding the original long paper 16a into a roll shape without causing winding deviation is obtained. A normal current value is set in the powder clutch 55. That is, the normal current value that has been investigated in advance is set in accordance with the type of the long paper 16a (type of printing medium such as paper quality, paper thickness, and paper width). Thereafter, by measuring the pulse period of the encoder 57, if the transport speed of the long paper 16a is constant, the diameter of the long paper 16a wound around the paper tube 51 at that time can be calculated. The current value of the powder clutch 55 described above is increased so that the set torque is proportional to the diameter.

  By this control, the original strong tension is applied when the long paper 16a is wound around the paper tube 51 with an overlap. At this time, the adhesive tape 60 does not peel off and the long paper 16a does not come off the paper tube 51. In addition, since the adhesive tape 60 having an easily peelable adhesive force can be used regardless of the type of the long paper 16a (the type of printing medium such as paper quality, paper thickness, paper width, etc.), When the paper 16a is unwound to the subsequent apparatus, the rear end of the long paper 16a fixed with the adhesive tape 60 is broken when it is opened, or the winding device is broken because it cannot be opened. Can be prevented.

  FIG. 4 is a block diagram illustrating a partial configuration of a control system of the image forming apparatus 10 according to the present embodiment. Note that portions corresponding to those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted. The control unit 70 detects the rising edge of the pulse signal from the output signal from the encoder 57, derives the pulse period between the rising edges, and derives the rotation speed of the rewinder rotary shaft 52 from the pulse period. In particular, in this embodiment, the control unit 70 measures the number of pulses from the encoder 57, and until the number of pulses corresponding to about two rotations of the rewinder rotary shaft 52 is reached via the powder clutch current control unit 71. The current of the powder clutch 55 is maintained at the minimum current value corresponding to the paper type of the long paper 16a.

  Thereafter, when the number of pulses corresponding to about two rotations of the rewinder rotating shaft 52 is reached, the control unit 70 does not cause the original long paper 16a to roll up in a roll shape without causing winding deviation. The current of the powder clutch 55 is set to a normal current value corresponding to the paper type of the long paper 16a through the powder clutch current control unit 71 so as to be in tension. Thereafter, the control unit 70 controls (increases) the current of the powder clutch 55 via the powder clutch current control unit 71 based on the pulse period from the encoder 57 (rotational speed of the rewinder rotary shaft 52). The powder clutch current control unit 71 controls the current to the powder clutch 55 under the control of the control unit 70.

  Further, the control unit 70 changes the tension of the long paper 16a based on the rotation speed of the rewinder drive motor 56 that rotates the rewinder rotation shaft 52 and the rotation speed of the rewinder rotation shaft 52 (rotation speed of the encoder 57). To detect. That is, if the long paper 16a is wound around the paper tube 51 while being tensioned, the current value to the powder clutch 55 is controlled so that a predetermined tension is always applied to the long paper 16a to be wound. Therefore, when the slip amount of the powder clutch 55 is zero, the powder clutch 55 is controlled by controlling the rotation speed of the rewinder rotating shaft 52 (rotation speed of the encoder 57) rotated by the rewinder drive motor 56 and the current value to the powder clutch 55. The difference between the rotational speeds of the rewinder rotating shaft 52 (rotational speed of the encoder 57) rotated by the rewinder drive motor 56 while sliding is a predetermined rotational speed (constant within a predetermined allowable range).

  On the contrary, when the long paper 16a is detached from the paper tube 51, or when the end of the long paper 16a cut by the auto cutter 22 comes out of the printer main body 30, the powder clutch 55 does not slip, and the rewinder rotating shaft 52 is the rotational speed of the rewinder rotating shaft 52 rotated by the rewinder drive motor 56 when the slip amount of the powder clutch 55 is zero (the rotational speed of the encoder 57) (within a predetermined allowable range). The same). Therefore, the end of the long paper 16a fixed by the adhesive tape 60 is detached from the paper tube 51, or the end of the long paper 16a cut by the auto cutter 22 is pulled out of the printer main body 30 and wound up. It is determined that the tension is not applied to the long paper 16a.

  That is, the actual rotational speed of the rewinder rotary shaft 52 (rotational speed of the encoder 57) and the rotational speed of the rewinder rotary shaft 52 that the rewinder drive motor 56 rotates when the powder clutch 55 does not slip (rotational speed of the encoder 57). From the above, the amount of tension applied to the actual long paper 16a is detected by calculating the slip amount of the powder clutch 55. When it is determined that the tension is not applied to the long paper 16a by detecting the tension, the rotation of the rewinder rotating shaft 52 is stopped.

B. Operation of Embodiment Next, the operation of this embodiment will be described.
FIG. 5 is a flowchart for explaining the operation (powder clutch current control process) of the image forming apparatus 10 according to the present embodiment. First, the control unit 70 sets the current of the powder clutch 55 so that the long paper 16a that has come out of the printer main body 30 can be wound, and the long paper is so tensioned that the adhesive tape 60 is not peeled off. The minimum current value specified in advance according to the paper type 16a (type of printing medium such as paper quality, paper thickness, paper width, etc.) is set (step S10). Next, the control unit 70 determines whether or not the pulse output from the encoder 57 has been detected, that is, whether or not the rewinder rotary shaft 52 has started rotating (step S12). If no pulse is detected from the encoder 57 (NO in step S12), if the rewinder rotary shaft 52 has not yet rotated, the control unit 70 returns to step S10 and supplies the current of the powder clutch 55. Waiting for a pulse to be detected from the encoder 57 while maintaining the minimum current value.

  In this state, the user manually attaches the leading end of the long paper 16 a discharged from the printer main body 30 to the paper tube 51 attached to the rewinder rotary shaft 52 with the adhesive tape 60. After that, printing on the printer main body 30 is started, and the long paper 16a after printing is sent out from the printer main body 30 and is automatically wound on the paper tube 51 by the rewinder rotary shaft 52. It has become.

  On the other hand, when the pulse output from the encoder 57 is detected (YES in Step S12), the control unit 70 determines that the rewinder rotary shaft 52 has started to rotate, and starts counting the number of pulses output from the encoder 57 (Step S12). S14). Next, the control unit 70 determines whether or not pulses from the encoder 57 are continuously detected (step S16). If no pulse is detected from the encoder 57 (NO in step S16), the rewinder rotary shaft 52 is not rotating and the long paper 16a is not wound around the paper tube 51. Wait without counting up.

  On the other hand, when the pulse from the encoder 57 is detected (YES in step S16), the rewinder rotary shaft 52 rotates and the long paper 16a is wound around the paper tube 51. The pulses from the encoder 57 are counted up (step S18). Next, the control unit 70 determines whether or not the number of pulses counted from the encoder 57 has become 200 or more (step S20). Here, 100 pulses are output from the encoder 57 in one revolution of the rewinder rotating shaft 52. That is, in step S20, it is determined whether or not the rewinder rotary shaft 52 has made two or more turns, or the long paper 16a is wound around the paper tube 51 with overlap, and the long paper 16a is not likely to come off the paper tube 51. doing.

  If the number of pulses counted from the encoder 57 is not 200 or more (NO in step S20), the long paper 16a has not yet been wound around the paper tube 51. Then, the process returns to step S16, and the count up of pulses from the encoder 57 is continued. During this time, the minimum current value is maintained in the powder clutch 55. On the other hand, when the number of pulses counted from the encoder 57 is 200 or more (YES in step S20), the control unit 70 is necessary for winding the long paper 16a into a roll without causing winding deviation. In order to obtain an appropriate tension, the current of the powder clutch 55 is set via the powder clutch current control unit 71 according to the type of the long paper 16a (the type of printing medium such as paper quality, paper thickness, paper width, etc.). The normal current value specified in advance is set (step S22). As a result, the long paper 16a discharged from the printer main body 30 is wound around the paper tube 51 while maintaining a predetermined tension without sagging.

  Next, the control unit 70 determines whether or not the pulse period from the encoder 57 is changed in the winding process of the long paper 16a (step S24). Here, the case where there is no change in the pulse period does not mean that there is no change at all, but means that the change is within an allowable range. Since the transport speed (linear velocity) of the long paper 16a is constant, the pulse cycle from the encoder 57 gradually becomes longer (rewinder rotation) as the long paper 16a is wound around the paper tube 51 and its diameter increases. The rotational speed of the shaft 52 becomes slow). If there is no change in the pulse period from the encoder 57 (NO in step S24), the control unit 70 repeats step S24 and maintains the normal current value to the powder clutch 55.

  On the other hand, when there is a change in the pulse period from the encoder 57 (YES in step S24), the control unit 70 determines the length of the long paper 16a wound around the paper tube 51 at that time from the pulse period of the encoder 57. The diameter is calculated, and a current corresponding to this diameter is applied to the powder clutch 55 via the powder clutch current control unit 71 with reference to a table (not shown) corresponding to the paper type (step S26). Thereafter, the control unit 70 returns to step S24 and thereafter increases the current value to the powder clutch 55 as the pulse period of the encoder 57 becomes longer. Accordingly, the long paper 16a discharged from the printer main body 30 does not sag regardless of the winding amount around the paper tube 51, and does not cause winding misalignment. The paper tube 51 is wound with the tension maintained.

  According to the above-described embodiment, according to the type of the long paper 16a, the slack at the time of winding the long paper 16a is prevented, and the adhesive tape that fixes the leading end of the long paper 16a is prevented from peeling off. Can do.

  According to the above-described embodiment, when the long paper 16a is fixed to the paper tube 51, the adhesive tape 60 having an adhesive force that can be easily peeled regardless of the paper type can be used. It is possible to prevent a failure of the apparatus for winding the paper 16a.

  Further, according to the above-described embodiment, the powder clutch 55 calculated from the rotation speed of the rewinder rotation shaft 52 and the rotation speed of the rewinder drive motor 56 is provided by including the encoder 57 for detecting the rotation of the rewinder rotation shaft 52. From the slip amount, the tension of the long paper 16a to be wound can be detected.

As mentioned above, although several embodiment of this invention was described, this invention is not limited to these, The invention described in the claim, and its equal range are included.
Below, the invention described in the claims of the present application is appended.

(Appendix 1)
The invention according to appendix 1 is a winding control method for winding a printing medium around a winding shaft in a roll shape, and the torque of the winding shaft at the start of winding of the printing medium is calculated as the printing target. It is a winding control method characterized by adjusting according to the paper type of the medium.

(Appendix 2)
The invention according to appendix 2 is characterized in that a current value to be supplied to a clutch unit that adjusts the torque of the winding shaft according to a supply current is set according to the paper type of the printing medium. The winding control method according to claim 1.

(Appendix 3)
The invention according to appendix 3 is a winding device that winds the printing medium around the winding shaft in a roll shape, and the torque of the winding shaft at the start of winding of the printing medium is determined by the winding medium. It is a winding apparatus characterized by including the adjustment part adjusted according to the paper type of this.

(Appendix 4)
The invention according to appendix 4 further includes a clutch unit that adjusts the torque of the winding shaft in accordance with a supply current, and the adjustment unit determines a current value supplied to the clutch unit as a paper type of the printing medium The winding device according to Supplementary Note 3, wherein the winding device is set according to the above.

(Appendix 5)
The invention according to appendix 5 further includes an encoder that detects the number of rotations of the take-up shaft, and the adjustment unit is configured such that the take-up shaft has a predetermined value after starting winding based on an output pulse from the encoder. It is determined whether or not the rotational speed has been reached, and the current value supplied to the clutch unit is maintained at a minimum current value until it is determined that the winding shaft has reached a predetermined rotational speed. This is the winding device according to Supplementary Note 4.

(Appendix 6)
According to the sixth aspect of the present invention, when the adjustment unit determines that the winding shaft has reached a predetermined number of rotations based on an output pulse from the encoder, the adjustment unit applies a predetermined tension to the print medium. The winding device according to appendix 5, wherein the current value supplied to the clutch unit is reset to a current value during normal winding according to the paper type of the printing medium. is there.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 15 Long paper holding part 16 Paper feed roll 16a Long paper (printing medium)
17, 19 Paper guide roller 18 End sensor 20 Unwinder shaft 21, 23 Paper transport roller 22 Auto cutter 24 Paper passage sensor 25 Unwinder 28 Powder brake 30 Printer body 31, 31k, 31c, 31m, 31y Drum / developer 32 Transfer Belt device 33 Toner cartridge 34 Electrical unit 35 Paper feed unit 36 Fixing device 37 Intermediate transfer belt 38 Drive roller 39 Driven roller 41 Secondary transfer backup roller 42 Secondary transfer roller 45 Face-up unit 47 Main body entry transport roller 50 Winding device 51 Paper tube 52 Rewinder rotating shaft 53, 54 Belt / gear 55 Powder clutch 56 Rewinder drive motor 57 Encoder 60 Adhesive tape 70 Control unit 71 Powder clutch current control unit

Claims (6)

A winding control method for winding a printing medium around a winding shaft in a roll shape,
A winding control method, wherein a torque of the winding shaft at the start of winding of the printing medium is adjusted according to a paper type of the printing medium. A current value to be supplied to the clutch unit that adjusts the torque of the winding shaft according to a supply current is set according to the paper type of the print medium;
The winding control method according to claim 1. A winding device for winding a printing medium around a winding shaft in a roll shape,
A winding device comprising: an adjustment unit that adjusts torque of the winding shaft at the start of winding of the printing medium according to a paper type of the printing medium. A clutch unit for adjusting the torque of the winding shaft according to a supply current;
The adjustment unit sets a current value to be supplied to the clutch unit according to a paper type of the print medium.
The winding device according to claim 3. An encoder for detecting the rotational speed of the winding shaft;
The adjustment unit determines whether the winding shaft has reached a predetermined rotational speed after starting winding based on an output pulse from the encoder, and the winding shaft reaches a predetermined rotational speed. Until the current value supplied to the clutch portion is kept at the minimum current value until it is determined that
The winding device according to claim 4. When it is determined that the winding shaft has reached a predetermined number of rotations based on an output pulse from the encoder, the adjustment unit applies a predetermined tension to the print medium. Reset the current value to be supplied to the current value during normal winding according to the paper type of the printing medium;
The winding device according to claim 5.

Images