A method for reducing the effects of variations in an unwinding, convolutely wound roll of web material is disclosed. The method utilizes the steps of: a. selecting a reference objective relating to a downstream operation, b. choosing at least one feedback device correlated to the reference objective, c. collecting process data from the at least one feedback device at different positions within a time-varying operation cycle for at least one operation cycle at a learning speed, d. calculating an error as the difference between the collected process data from step (c) and a reference signal related to the selected reference objective, e. generating a correction signal based upon the calculated error from step (d) and, f. applying the correction signal to the actuator during a succeeding time-varying operation cycle.

Provided is an image forming apparatus with rollers capable of coming into contact with or leaving a recording medium, in which meandering of the recording medium is suppressed. The apparatus includes a tension adjuster for adjusting a tension applied to the recording medium nipped between a plurality of roller pairs. The tension adjuster is located upstream of, among the roller pairs, the most upstream roller pair located on the most upstream side in the conveyance path or downstream of, among the roller pairs, the most downstream roller pair located on the most downstream side in the conveyance path and the tension adjuster rotates in the direction of conveyance of the recording medium to adjust the tension of the recording medium.

A printing apparatus includes a transport unit 30 that transports a medium M in a transport direction F, a printing unit that prints on a printing surface M1 of the medium M, and a removal unit 60 that is provided on an upstream side in the transport direction F with respect to the transport unit 30 and is provided so as to come into contact with the printing surface M1.

An image forming apparatus includes: a conveyance section configured to convey a sheet in a direction opposite to a first conveyance direction during image formation, the direction being a second conveyance direction; and a distortion correction section disposed on an upstream side of a transfer nip in the first conveyance direction and configured to correct, when the sheet is conveyed by the conveyance section in the second conveyance direction, distortion of the sheet generated when the sheet passes through a fixing nip.

The present invention provides a guide device for guiding print medium onto a take-up roll in a printing system. The guide device comprises a first guide member presenting a substantially planar surface for limiting or preventing lateral deviation of a printed medium output from the printing system as the medium moves along a transport path towards a take-up roll for winding or taking up a length of the medium. The first guide member is stationary in use. A position of the first guide member is adjustable in a direction transverse to the transport path for setting the position to limit or prevent lateral deviation of the medium along the transport path. The guide device further comprises a second guide member presenting a support surface configured and arranged to support the medium thereon as the medium travels along the transport path towards the take-up roll. The first guide member and the second guide member are preferably integrally formed as a guide unit. Further, the invention provides a printing system which incorporates such a guide device.

A printing apparatus is configured to perform in a first mode in which a second driving unit drives a second spool to feed out a sheet from a roll to a printing unit via a second guide, the printing unit performs printing on the fed sheet, and a basket unit receives the printed sheet printed on by the printing unit, and a second mode in which a first driving unit drives a first spool to feed the out the sheet from a roll to the printing unit via a first guide, the printing unit performs printing on the fed sheet, and the second driving unit drives the second spool to wind up the printed sheet printed by the printing unit as a roll.

A slitter device includes a first tension detecting unit for obtaining a raw-cloth tension value which is a tension value of a sheet material fed out from a let-off mechanism, a second tension detecting unit for obtaining a divided material tension value which is the sum of the tension values of each of divided sheet materials, and a drive control device which includes a comparator to which the first tension detecting unit and the second tension detecting unit are connected, and which compares the raw-cloth tension value and the divided material tension value with each other; and a drive controller which controls an operating state of a roll driving motor such that the raw-cloth tension value and the divided material tension value coincide or substantially coincide with each other based on the comparison result of the comparator.

A roll feeder is usable to convey a hoop material to a pressing machine. The roll feeder includes a paired first roll and second roll configured to be disposed so as to clamp the hoop material and feed the hoop material along a conveyance direction, a motor configured to drive at least one of the first roll and the second roll, and a controller configured to control drive of the motor. The controller includes a process drive instruction component configured to drive the motor so as to feed the hoop material to a pressing machine side in between one press working and next press working, and a working drive instruction component configured to drive the motor so as to feed the hoop material to the pressing machine side during press working.

The invention relates to a winding device (500) for web-type material, wherein the winding device (500) has at least one first frame (501) and at least one first roll holding device (519) having at least one roll holding means (522) that is rotatable about a first rotational axis (521), and wherein the winding device (500) has at least one throw-on element (503), and wherein the at least one throw-on element (503) is disposed movably relative to the first frame (501) in at least one adjustment direction (B) and/or opposite said at least one adjustment direction (B), and wherein this at least one adjustment direction (B) has at least one component that points toward the first rotational axis (521), and wherein a guidance system (504) for at least one webbing-up means for webbing up at least one material web (02) is disposed such that a first guidance section (506) of the guidance system (504) is disposed fixedly relative to the at least one first frame (501), and in that regardless of the position of the at least one throw-on element (503), at least one rectilinear connection between the at least one throw-on element (503) and the first rotational axis (521) always intersects a second guidance section (507) of the guidance system (504), and also relates to a method for threading a material web into a winding device.

The invention relates to a winding device (500) for web-type material, wherein the winding device (500) has at least one first frame (501) and at least one first roll holding device (519) having at least one roll holding means (522) that is rotatable about a first rotational axis (521), and wherein the winding device (500) has at least one throw-on element (503), and wherein the at least one throw-on element (503) is disposed movably relative to the first frame (501) in at least one adjustment direction (B) and/or opposite said at least one adjustment direction (B), and wherein this at least one adjustment direction (B) has at least one component that points toward the first rotational axis (521), and wherein a guidance system (504) for at least one webbing-up means for webbing up at least one material web (02) is disposed such that a first guidance section (506) of the guidance system (504) is disposed fixedly relative to the at least one first frame (501), and in that regardless of the position of the at least one throw-on element (503), at least one rectilinear connection between the at least one throw-on element (503) and the first rotational axis (521) always intersects a second guidance section (507) of the guidance system (504), and also relates to a method for threading a material web into a winding device.