Abstract: A sheet correcting device includes a plurality of curved surface members including curved surfaces, respectively, to deform a sheet along the curved surfaces, the plurality of curved surface members disposed along a conveyance direction of the sheet, a plurality of pressing members disposed facing the curved surfaces of the plurality of curved surface members, respectively, to press the sheet against the curved surfaces of the plurality of curved surface members, respectively, a sheet tensioner to apply tension to the sheet, and a heater to heat the sheet that is bent by the curved surfaces of the plurality of curved surface members.

Abstract: A post-processing apparatus includes memory and a processor configured to control a curving device that curves a sheet, which is transported to the curving device, by pressing the sheet, control folding processing that is performed on a sheet curved by the curving device, and control, when folding processing is performed such that two ends of a sheet in a transport direction of the sheet face outward in opposite directions after the folding processing has been performed on the sheet, the curving device so as to curve the sheet in plural directions with respect to a transport surface.

Abstract: The curl straightening device includes supporting rollers, an endless belt, a curl straightening roller, and a contact member. The supporting rollers are disposed rotatably about a shaft extending in a direction orthogonal to a conveying direction of the sheet. The endless belt is stretched across the supporting rollers, and circulates in the conveying direction. The curl straightening roller makes contact with an outer peripheral surface of the endless belt between the supporting rollers so as to form a nip portion, and straightens curl of the sheet which passes through the nip portion. The nip portion is shaped so that the endless belt curves along a peripheral surface of the curl straightening roller. The contact member is disposed to oppose a center portion of the curl straightening roller in an axial direction, and makes contact with the curl straightening roller so as to prevent deformation of the curl straightening roller.

Abstract: The problem of web flutter experienced by webs spanning the draw between a drying area of a fiber web manufacturing machine and winder, wherein the web is assisted by airfoils is mitigated by using at least one airfoil having multiple conduits connected to at least one air supply, at least two areas with openings in form of slots or rows of holes (or elongated openings) are oriented a direction substantially parallel to the direction of web movement, wherein the openings communicate with the multiple conduits, a Coanda surface disposed adjacent to the openings, and wherein the openings are configured to direct air flowing from the air source through the multiple conduits, through the openings over the Coanda surface in a direction substantially perpendicular to the direction of web movement.

Abstract: A disperser plate segment for removing contaminants from fiber stock, the segment comprising: radially inner and outer edges, multiple radially concentric rows of teeth, each row of teeth having multiple teeth defining multiple channels disposed intermediate the teeth, each of the channels having a lower channel base surface and each of the teeth having a top surface, at least one face surface extending from the channel base surface to the top surface, and wherein at least one of the face surfaces comprises at least two grooves.

Abstract: The present invention provides a surface-reading apparatus that includes a subject-flexing mechanism and a surface-reading component. The subject-flexing mechanism causes a subject to flex in one of a convex form and a concave form. The surface-reading component reads a characteristic of a surface condition of the subject that has been flexed by the subject-flexing mechanism. The surface-reading component can includes an optical reading component that optically reads the characteristic of the surface condition of the subject. The optical reading component may be a reflected light-reading component that reads the characteristic of the surface condition of the subject with reflected light or may be a transmitted light-reading component that reads the characteristic of the surface condition of the subject with transmitted light.

Abstract: In a paper or board machine drying line after the wire section, during dewatering a web's (W) width is affected in a direction crosswise to the web's traveling direction. Starting from an edge, at least one device (20A, 20B) brings about a force effect of a desired magnitude which is directed all the way to a desired arbitrary crosswise web position in order to modify web characteristics. A device in a paper or board machine line after the wire section has means for processing the web and for dewatering. The paper or board machine line after the wire section further has at least one device (20A; 20B) for directing a force effect at a desired partial area (WS) of the web (W) in the cross machine direction in order to modify the web's characteristics profile in the cross machine direction.

Abstract: An image forming apparatus having: an image forming portion to form an image on a sheet; a fixing device to fix the image to the sheet by heating; a conveying path switching member to switch a conveying direction of the sheet, which is provided on downstream of the fixing device in a sheet conveying direction; a first conveying path which has a first curved portion and is provided on downstream of the conveying path switching member; a second conveying path which has a second curved portion and is provided on downstream of the conveying path switching member; a curl applying member which is provided on downstream of the fixing device, and on upstream of the first and second curved portions; and a control unit to control driving of the conveying path switching member and of the curl applying member.

Abstract: To provide a curl straightening method for image receiving paper for sublimation dye transfer, which is capable of realizing a smaller roll core diameter of the roll paper. The curl of an image receiving paper 100 for sublimation dye transfer having stiffness from 500 to 2,500 mg in a direction parallel to the printing direction, which is measured according to JIS L1085, JIS L1096, is straightened by allowing the image receiving paper 100 to pass through gaps 4a, 5a of a guide 3 that bends the image receiving paper 100 in a reverse curling direction.

Abstract: A running web is decurled by controlling web tension as well as the angle of wrap on a decurler roll and a cooperating pivot roll, all without affecting web tension in the downstream web converting process. An upstream brake roll and a downstream pull roll control web tension within the decurler apparatus and independent decurler rolls are provided for removing up-curl and down-curl.

Abstract: The invention relates to a press roll (1) comprising a flexible rotating endless-loop blanket (3) of a liquid-impervious material, two disc-shaped roll heads (4, 5), and a clamp element (14) filled with a pressurized medium for clamping the lateral rims (21) of the blanket (3) to the respective ones (4, 5) of the roll heads. The invention is implemented by adapting between the pressurized-medium-filled clamp element (14) and the blanket (3) an annular ring (18) serving to press the rim of the blanket (3) during the pressurization of said clamp element against the inner rim surface (15) of a sector plate (7) and, respectively, serving to contract the clamp element (14) when the pressure of the clamp element (14) is removed or lowered.

Abstract: A sheet curl measurement system and method and an automatic sheet decurling system controlled thereby for the printed paper sheets output of printer. The sheet curl may be remotely sensed without contacting or interfering with the motion of the sheets in their normal sheet path, using a simple but accurate optical sheet curl sensor operating on a portion of the moving sheet at an angle thereto and perpendicularly thereto, with displacement insensitive optics, in both an angular direction substantially parallel to the sheet movement direction and an angular direction substantially transverse to the sheet movement direction, with ratioing of the two output signals.

Abstract: A running web is decurled by controlling web tension as well as the angle of wrap on a decurler roll and a cooperating pivot roll, all without affecting web tension in the downstream web converting process. An upstream brake roll and a downstream pull roll control web tension within the decurler apparatus and independent decurler rolls are provided for removing up-curl and down-curl.

Abstract: Machine for use in manufacturing a fibrous material web and a method of manufacturing the fibrous material web. The machine includes at least one electrostatic air boundary layer swirler arranged near a moving surface. The moving surface includes at least one of the fibrous material web, a belt, a roll, a felt, and a surface which supports the fibrous material web. The at least one electrostatic air boundary layer swirler includes at least one charging electrode and at least one counterelectrode. At least one device for moistening is arranged near the at least one electrostatic air boundary layer swirler. The at least one electrostatic air boundary layer swirler is adapted to at least one of at least partially remove a laminar air boundary layer formed on the moving surface, and at least partially disturb a laminar air boundary layer formed on the moving surface.

Abstract: Process for laterally sealing at least one excess pressure or vacuum zone adjoining a moving surface in a paper-making machine by way of a sealing device that includes at least one sealing element, the process comprising arranging the sealing device in a receptacle area of a holder, placing the sealing device relative to the holder against the moving surface, wherein the receptacle area is designed as a clamping receptacle, and acting on the sealing element with a clamping force through clamping surfaces of the clamping receptacle during its movement relative to the holder and in its applied state.

Abstract: Apparatus and process for processing material web. Apparatus includes a rotatable cylinder, in which material web is guided over rotatable cylinder, first fixed carrier, and at least three belt guide rolls, in which one of the at least three guide belts is pivotably coupled to fixed carrier. Endless belt is mounted on and guided by at least three belt guide rolls, where endless belt is guided over rotatable cylinder in a same direction as material web, and pivotably coupled belt guide roll is pivotably positionable between a tensioning position and a retracted position relative to endless belt. Second fixed carrier is provided and tensioning roll is positioned outside of endless belt and pivotably coupled to second fixed carrier, so that tensioning roll is pivotably positionable between a retracted position and a loading position of endless belt. Tensioning roll is further positioned between pivotably coupled belt guide roll and adjacent belt guide roll.

Abstract: For levelling webs of paper (3) gaps (20) are provided, each defined by a deflection roll (17) and a stationary bending face (16). For changing the wrap angle at the bending face (16) and also for non-bended passage of the web (3) through the device (1) the deflection roll (17) is transferable into varying positions powered by a positioning device (30). Thereby high speed operation with reliable function and simple construction are achieved.

Abstract: A recording apparatus is capable of preventing both contamination on a recording surface due to a contact of a recording medium on an ink discharging surface even when recording on the recording medium with a concave/convex portion and an ill-discharged state of an ink. The recording apparatus has a feeding unit for feeding a recording medium and a recording head as a recording unit for recording an image on the recording medium fed by the feeding unit. A first guide member (shaft) and a second guide member that serve as a correcting mechanism are provided upstream in a feeding direction from the recording head, for correcting the concave/convex portion of the recording medium.

Abstract: A strip of material is fed continuously to a machine, along a given path extending through a curling station for the strip, at which the path has a curved segment which forms a loop. The strip inside the curling station is subjected to flexing, by applying suction to the strip along at least part of the loop.

Abstract: A sheet decurler such as may be used to decurl liquid or solid toned printed or copied sheets. The decurler has an extended multidirectional nip having first and second decurling members for removing multiple curl conditions from a sheet.

Abstract: A decurling apparatus and method to decurl a substrate in a xerography machine. The invention combines a decurling apparatus having a penetration roller with a small diameter penetrating into a belt. The penetration roller is adjustable and as it pushes into the belt, more decurling of a copy sheet will occur. A controller determines the amount of decurling that is necessary and sends an electrical signal to a driver which operates the penetration roller. The penetration roller is either pressed into or away from the decurling belt. A cam shaft is turned by a motor to cause the cams to move the penetration roller. Although the controller stores the information on the cam location, a home sensor is required to indicate home position. The cam shaft is returned to home position before adjusting the penetration roller to a new level of decurling.

Abstract: A system for decurling a sheet which is being advanced in a predetermined path within a printing machine includes a mechanism for generating a flow of room ambient air. The decurling system further includes a mechanism for directing the flow of room ambient air onto the sheet. Moreover, the decurling system includes a decurler adapted to apply mechanical force to the sheet after the flow of room ambient air has been directed onto the sheet by the directing mechanism. Finally, a mechanism is included for rotating the sheet to advance the sheet to the decurler in a direction substantially perpendicular to the direction of the predetermined path.

Abstract: An image reproduction machine has an outlet opening through which successive image-imprinted paper sheets are forwardly discharged by a spaced series of exit roller sets. The discharged sheets are delivered into an open-topped housing well area having a horizontal bottom surface with a back edge forwardly and downwardly offset from the outlet opening, and a ramped surface extending downwardly and rearwardly from the horizontal surface back edge. A deflector bar adjacent the outlet opening has first downwardly projecting portions that engage each discharging sheet and temporarily corrugate and stiffen it in a manner assuring that its front end portion will forwardly clear the rear horizontal surface edge before bending down to its level. These downwardly projecting portions are interdigitated with the exit roller sets and positioned to perform their temporary corrugation function without crinkling the discharging sheets.

Abstract: The apparatus for straightening sheet curls of the present invention is operating in the following processes 1 and 2 when splicing the sheets from the parent rolls:1 The wrap angle adjusting apparatus starts to return one of the main backup rolls and the decurler bar from the position corresponding to the small parent roll to the position corresponding to the large parent roll.2 The apparatus for suddenly changing the wrap angle causes the other of the main backup rolls and the decurler bar to retract from the standard position at which the sheet is pushed inwardly to a position at which the sheet is not pushed inwardly or moderately so as to suddenly change the wrap angle of the sheet substantially at the same timing as the start of return above described in process 1. During this operation, the sheet is guided by the secondary backup rolls, and the wrap angle of the sheet is set to a value appropriate to the diameter of the second parent roll having a large diameter.

Abstract: A web decurler for selectively removing the different degrees of curl from a running web. The decurler includes first, second and third relatively large diameter, rotatable rollers and a fourth roller assembly having at least one relatively small diameter, rotatable roller. All of the rollers are disposed adjacent to the web path so that the running web may wrap about a portion of their outer peripheral surfaces. The positions of the first and second rollers remain fixed with respect to the decurler, while the third roller is spaced a fixed predetermined distance and may be moved about the central longitudinal axis of one of the first and second rollers. The fourth roller assembly is spaced from and is movable about a preselected axis that is spaced from the other rollers. A first member supports the fourth roller assembly for movement about the preselected axis.

Abstract: The present invention provides an apparatus for straightening sheet curls in which a wrap angle .theta. is provided for a sheet wound off from a winding roll by applying a decurler bar to the sheet between two backup rolls, the apparatus comprising a wrap angle adjusting device for adjusting the wrap angle of the sheet by relatively displacing the backup rolls and the decurler bar, and a controller which serves to calculate an optimum wrap angle in accordance with changes in the diameter of the winding roll using the logical equation: .theta.=A/D.sup.q +B (wherein A, B, q are constants which are previously determined) from which the optimum wrap angle .theta. can be calculated for the diameter D of the winding roll, and to control the wrap angle adjusting device on the basis of the results of this calculation. In consequence, the present invention is able to realize automatization of straightening of curls with a simple configuration and in a rapid and highly precise manner.