Abstract: A chopper folder for a rotary press folds signatures which are periodically conveyed, one signature at a time, from a folding machine. The chopper folder includes a pair of folding rollers for folding a signature parallel to the conveyance direction, a prime mover, a crank arm fixed to an output shaft of the prime mover to be rotated together with the output shaft, a blade holder connected to the crank arm via a link, a chopper blade held in the blade holder and adapted to push the signature from an upper surface thereof in order to insert the signature into a space between the pair of folding rollers, and guide units for restricting motion of the blade holder such that the blade holder reciprocates only in a direction perpendicular to a conveyance plane along which the signature is conveyed.

Abstract: The folding station of a rotary printing press has a folding cylinder on which the printed paper web is cut into sections. Mounted opposite the folding cylinder, a jaw cylinder has cut in its surface several jaw cavities each extending parallel to the jaw cylinder axis for receiving the midpart of the web section as the same is inserted therein by a folding blade on the folding cylinder. Each jaw cavity has mounted therein a series of fixed jaw parts and a series of movable jaw parts, the latter being jointly movable toward and away from the former for engaging and folding the midpart of the web section. The two outmost ones of the movable jaw parts are positioned closer to the fixed jaw parts than are the other, medial movable jaw parts, in order to more firmly engage the margins of the web section without causing ink offset between the contacting surfaces of the image areas of the web section.

Abstract: A paper jam detection system for a folding machine includes an interval signal generator for generating an interval signal which assumes ON and OFF levels alternately according to cutting intervals of a cutting cylinder; a signature detection mechanism including reflection plates each having a light reflection surface and being arranged circumferentially at an outer circumferential surface portion of a jaw cylinder and a photoelectric sensor adapted to generate a reflection plate detection signal upon detection of the reflection plate; and a control unit for outputting a paper jam signal on the basis of the interval signal and the reflection plate detection signal.

Abstract: Problems exist such as the presence of a narrow gap when the vicinity of a spliced joint of paper webs is passed between an outer surface of a roller and an outer surface of a folding cylinder. Paper blockages due to increased thickness are therefore likely to arise, making it easy for the paper web to become torn. This in turn damages the paper, and machine stoppages are also increased.

Abstract: A printed paper web is cut into sections by a cutting cylinder while traveling on a folding cylinder, and each paper section has its midpart subsequently pushed off the folding cylinder into a jaw cavity in a jaw cylinder thereby to be folded into a signature. The jaw cavity has mounted therein a series of spaced-apart movable jaw parts jointly movable into and out of paper section-folding engagement with a series of spaced-apart fixed jaw parts. The folding cylinder has a retractable folding blade mounted thereto for pushing each paper section into space between the series of fixed and movable jaw parts. Fabricated from sheet metal, the folding blade has a series of discrete folding blade parts each having a portion that is situated out of register with both of the fixed and the movable jaw parts or with the image area of the paper section and which is thicker than the rest of the folding blade part.

Abstract: The folding station of a rotary printing press has a folding cylinder on which the printed paper web is cut into sections. Mounted opposite the folding cylinder, a jaw cylinder has cut in its surface several jaw cavities each extending parallel to the jaw cylinder axis for receiving the midpart of the web section as the same is inserted therein by a folding blade on the folding cylinder. Each jaw cavity has mounted therein a series of fixed jaw parts and a series of movable jaw parts, the latter being jointly movable toward and away from the former for engaging and folding the midpart of the web section. The two outmost ones of the movable jaw parts are positioned closer to the fixed jaw parts than are the other, medial movable jaw parts, in order to more firmly engage the margins of the web section without causing ink offset between the contacting surfaces of the image areas of the web section.

Abstract: A paper jam detection system for a folding machine includes an interval signal generator for generating an interval signal which assumes ON and OFF levels alternately according to cutting intervals of a cutting cylinder; a signature detection mechanism including reflection plates each having a light reflection surface and being arranged circumferentially at an outer circumferential surface portion of a jaw cylinder and a photoelectric sensor adapted to generate a reflection plate detection signal upon detection of the reflection plate; and a control unit for outputting a paper jam signal on the basis of the interval signal and the reflection plate detection signal.

Abstract: A series of offset perfecting press units are stacked for printing multicolor images on both surfaces of a web traveling successively therethrough. Each printing unit has two plate cylinders each split into a pair of halves, and two blanket cylinders in rolling contact with the respective plate cylinders and, via the web, with each other. The plate cylinder halves are capable of independent displacement both axially and circumferentially of the plate cylinder for image registration both transversely and longitudinally of the web. The four plate cylinder halves are driven independently from as many drive motors via respective drive linkages. Two of the four drive motors are further coupled via two associated ones of the drive linkages to the blanket cylinders. Motor power is first transmitted to the blanket cylinders, which are less in diameter than the plate cylinders, then to the two plate cylinder halves.

Abstract: The gap adjusting device for nipping rollers is provided with one roller rotatably provided at a prescribed position and the other movable roller. The nipping rollers are adapted so that the other roller is capable of forcing a paper web passing between the two rollers onto the one roller. A nipping-roller gap adjusting device includes a pair of supporting arms, one end of each of the supporting arms being swingably supported and the other end thereof rotatably supporting the other roller. A pressing force imparting device gives to the support arms a force working in such a direction that causes the other roller to approach the one roller and which, at the same time, can adjust the magnitude of the force. A minimum gap setting device can set a minimum gap between the one roller and the other roller. A gap adjusting device adjusts the size of a gap between the one roller and the other roller. A fixed frame member rotatably supports the one roller. The gap adjusting device is mounted on the fixed frame.

Abstract: A groove for receiving opposite end edges of an object, like a printing plate that extends around a printing cylinder, is formed in a printing cylinder adjacent the outer circumferential surface thereof to extend from an axially extending anchor-shaft hole to the outer circumferential surface of the cylinder body. One wall surface of the groove intersects, at an acute angle, a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the circumferential surface of the printing cylinder. When an anchor shaft inserted into the anchor-shaft hole is rotated by means of elastic force, pins studded into a cutaway surface of the anchor-shaft enter anchor holes formed in an end edge portion of the object and secure the end edge portion within the groove. Thus, the object is attached to the printing cylinder.

Abstract: A tab for fixing a paper web end portion of a paper roll includes a substantially parallelogram-shaped base sheet having two diagonally opposite acute angles. A plurality of linear, discontinuous cuts are formed on the base sheet in parallel with two opposite sides of the base sheet to thereby define a first portion in cooperation with one of the two opposite sides and a second portion in cooperation with the other side. The cuts extend to at least one of other two opposite sides of the base sheet. Adhesive is applied to the first and second portions on the same surface such that an appropriate nonadhesive portion is formed between adhesive applied onto the first portion and adhesive applied onto the second portion. A release sheet having a size greater than that of the tab is attached to an adhesive-applied side of the tab such that a portion thereof is projected beyond the profile of the tab. Alternatively, the release sheet assumes the form of tape.

Abstract: A series of offset perfecting press units are stacked for printing multicolor images on both surfaces of a web traveling successively therethrough. Each printing unit has two plate cylinders each split into a pair of halves, and two blanket cylinders in rolling contact with the respective plate cylinders and, via the web, with each other. The plate cylinder halves are capable of independent displacement both axially and circumferentially of the plate cylinder for image registration both transversely and longitudinally of the web. The four plate cylinder halves are driven independently from as many drive motors via respective drive linkages. Two of the four drive motors are further coupled via two associated ones of the drive linkages to the blanket cylinders. Motor power is first transmitted to the blanket cylinders, which are less in diameter than the plate cylinders, then to the two plate cylinder halves.

Abstract: A groove for receiving opposite end edges of an object such as a printing plate is formed in a printing cylinder in the vicinity of the outer circumferential surface thereof such that the groove extends from an axially extending anchor-shaft hole toward the outer circumferential surface of the cylinder body, thereby opening at the outer circumferential surface. One wall surface of the groove intersects, at an acute angle, with a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the outer circumferential surface of the printing cylinder. The first end edge portion of the object is bent at an acute angle, and the second end edge portion of the object is bent at an obtuse angel which is substantially the supplementary angle of the acute angle.

Abstract: A chopper folder for a rotary press folds signatures which are periodically conveyed, one signature at a time, from a folding machine. The chopper folder includes a pair of folding rollers for folding a signature parallel to the conveyance direction, a prime mover, a crank arm fixed to an output shaft of the prime mover to be rotated together with the output shaft, a blade holder connected to the crank arm via a link, a chopper blade held in the blade holder and adapted to push the signature from an upper surface thereof in order to insert the signature into a space between the pair of folding rollers, and guide units for restricting motion of the blade holder such that the blade holder reciprocates only in a direction perpendicular to a conveyance plane along which the signature is conveyed.

Abstract: In order to accurately perform the gap adjustment of nipping rollers; one roller rotatably provided at a prescribed position and the other movable roller; the nipping rollers being adapted so that the other roller is capable of forcing a paper web passing between the two rollers onto the one roller, there is provided a nipping-roller gap adjusting device comprising: a pair of supporting arms, one end of each of the supporting arms being swingably supported and the other end thereof rotatably supporting the other roller; a pressing force imparting means which gives to the support arms a force working in such a direction that causes the other roller to approach the one roller and which, at the same time, can adjust the magnitude of the force; a minimum gap setting means which can set a minimum gap between the one roller and the other roller; a gap adjusting means which adjusts the size of a gap between the one roller and the other roller; and a fixed frame member which rotatably supports the one roller and on w

Abstract: A groove for receiving opposite end edges of an object such as a printing plate is formed in a printing cylinder in the vicinity of the outer circumferential surface thereof such that the groove extends from an axially extending anchor-shaft hole toward the outer circumferential surface of the cylinder body, thereby opening at the outer circumferential surface. One wall surface of the groove intersects, at an acute angle, with a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the outer circumferential surface of the printing cylinder. The first end edge portion of the object is bent at an acute angle, and the second end edge portion of the object is bent at an obtuse angel which is substantially the supplementary angle of the acute angle.

Abstract: A drag roller device for a printing apparatus comprises a cleaning means for cleaning a drag roller. The cleaning means is in contact with a part of the circumferential surface of the drag roller except for the circumferential area around which a printed continuous sheet fed from a printing section is wound. The cleaning means may be movable within the circumferential area of the drag roller or separable from it. The cleaning means may be supplied with a cleaning liquid.In the drag roller device thus constructed, the cleaning means can remove various stains and/or spots of ink transferred from the circumferential surface of the drag roller and/or additional rollers at each revolution of the drag roller. This cleaning operation of the cleaning means ensures to prevent the printed surface of the continuous sheet succeedingly fed from damaging with the stains and spots of ink from the drag roller and so on.

Abstract: The present invention relates to second-fold rollers for a folding device adapted for cutting and folding superposed paper webs into a folded section of superposed sheets. The second-fold rollers are arranged in a pair in parallel each other, at least one of which is provided with at least one of non-contact section so formed as to prevent from contacting with the rear corners of the paper sheet to be passed between these second-fold rollers. The non-contact section is a recess partially formed in its cylindrical surface near each end of the second-fold roller.

Abstract: This invention relates to a jaw folding device for a jaw cylinder of jaw-type folder which can be switched between a correct run mode for performing a duplicate folding and a straight run mode performing an ordinary folding. This jaw folding device comprises a controllable jaw plate which is secured to a controllable jaw plate shaft, a fixed jaw plate arranged so as to face to the controllable jaw plate, an actuating means for actuating the controllable jaw plate between its opening and closing positions in synchronism with a base machine, and a fixing means for fixing the controllale jaw plate in its opening position where a paper is not picked up.

Abstract: The present invention relates to a jaw folding device for a jaw cylinder of jaw-type folder and comprises a mother member detachably fixed in the groove formed in the cylinder, a fixed jaw plate fixed to the mother member, a controlled jaw plate so arranged as to contact to the fixed jaw plate a controlled jaw plate shaft for fixing the controlled jaw plate and pivotably supported on the mother member, an urging means for urging the controlled jaw plate to the fixed jaw plate and an angular control means for changing the angle of the controlled jaw plate shaft. The angular control means is actuated by a cam mechanism. The controlled jaw plate is isolated from the fixed jaw plate as the angular control means is actuated. The mother member of this jaw folding device can be easily dismounted from the cylinder drum so that the jaw folding device can be removed from the jaw-type folder to perform checking, maintenance, adjustment or replacement it.