JP5874485B2 - Printer folding machine and web folding method - Google Patents

Description

  The present invention relates to a folding machine for a printing press and a web folding method.

  2. Description of the Related Art Conventionally, a rotary printing press is provided with a folding machine for cutting and folding a printed web in a predetermined size inline. In such a folding machine, a web on which a pattern is printed passes through a triangular plate, a nipping roller, a cutter cylinder, a folding cylinder, a holding cylinder, a chopper, and the like to become a printing signature. More specifically, a web on which a pattern is printed and which is continuously conveyed is folded in half by a triangular plate so as to form a fold along the conveyance direction of the web, and the web folded in half by a triangular plate. Is cut by a cutter cylinder along a direction perpendicular to the conveying direction of the web. Then, the signature is folded so as to form a fold extending parallel to the cutting direction by the cutter cylinder by chucking the center position of the cut signature (web piece) with the holding cylinder with the holding cylinder. The choke is further folded by the chopper so as to form a fold extending in a direction perpendicular to the cutting direction by the cutter cylinder. Here, when the web feed position is shifted when the web is sent to the folding machine, the folding position of the web by the folding machine is shifted and the printed signature becomes a defective product. There is.

  As a device for adjusting the folding position of the web, a web guide controller and a cut-off controller installed in a web path portion on the upstream side of the folding machine in a printing machine are used. The web guide controller optically reads the end portion of the continuously conveyed web, and detects and corrects a positional deviation in the left-right direction (width direction) due to the meandering of the web. Further, the cut-off controller optically reads the timing in the feeding direction of the pattern of the web that is continuously conveyed, and corrects the cutting timing in the cutter cylinder. However, these web guide controllers and cut-off controllers are devices that maintain a state in which the print signature is once matched to a non-defective state, and it is not possible to return a large misalignment that occurs at the start of printing to a non-defective state. This is not possible, and it is necessary to perform an operator's visual and manual alignment work. Here, the manual alignment operation has to be performed by repeating the visual check and the operation of the adjusting device, and there is a problem that it takes time until the printing signature becomes a non-defective product and printing loss occurs. .

  In order to solve such a problem, methods disclosed in Patent Documents 1 to 4 are known as methods for adjusting the folding registration position of a print signature. In Patent Document 1, a printed mark on a signature is detected at the timing when the mark is ejected from the folding cylinder, and the folded state of the signature is determined based on this detection information, and the mark is registered so as to be in an appropriate position. A folding register automatic control apparatus is disclosed. Further, Patent Document 2 discloses an inspection device that measures the actual size of a signature by a sensor that detects the positions of the mark in the X direction and the Y direction at two diagonal corners of the signature, and compares it with a normal size. Is disclosed. In Patent Document 3, a mark printed on a web at regular intervals is captured by a camera at regular intervals, the captured mark and a reference mark are displayed on a monitor, and the amount of deviation is notified to an operator. Thus, a method for correcting misalignment is disclosed. Further, in Patent Document 4, a detection sensor for detecting a signature that flows in a sashimi-like manner on a conveyor after passing through an impeller in a folding machine is installed separately from the top and bottom of the signature by the length of the signature. A signature control device is disclosed that controls the cutting position based on the relationship of detection signals.

JP-A-5-309828 Japanese Patent Application Laid-Open No. 7-277592 JP-A-8-174804 JP-A-10-157080

  However, the methods disclosed in Patent Documents 1 to 4 have a problem that it is not possible to simultaneously detect a deviation in the folding position of the web and a deviation in the cutting position of the web in the folding machine. That is, in the method disclosed in Patent Document 1, only the deviation of the cutting position of the web is detected. The method disclosed in Patent Document 2 can measure the size of a signature, but cannot detect the direction of deviation of the folding position or the cutting position. There is a problem that can only be used. Further, in the method disclosed in Patent Document 3, the captured mark and the reference mark are displayed on the monitor, and the operator manually corrects the positional deviation, which is effective in reducing printing loss. There is a problem that is not appropriate. Also, if the web width is different, the position in the direction orthogonal to the web conveyance direction changes, so the reference position is not constant with respect to the camera, and it is impossible to detect the deviation of the folding position in the first chopper. There's a problem. Further, the method disclosed in Patent Document 4 has a problem that it only detects the deviation of the cutting position of the web and cannot detect the deviation of the folding position of the web.

  The present invention has been made in consideration of these points, and can detect a deviation in the folding position of the web and a deviation in the cutting position of the web at the same time. It is an object of the present invention to provide a folding machine for a printing press and a web folding method capable of greatly reducing printing loss as compared with a case where alignment work is performed.

  The folding machine of the printing press according to the present invention includes a triangular plate that folds a continuously conveyed web in half so as to form a fold along the conveyance direction of the web, and a web that is folded in half by the triangular plate, A cutter cylinder for cutting along a direction orthogonal to the web conveyance direction, and a web piece cut by the cutter cylinder along a center line of the web piece extending in a direction orthogonal to the cutting direction of the web by the cutter cylinder A chopper that folds in half, a pair of imaging units that respectively image the web that is folded in half by the triangular plate between the triangular plate and the cutter cylinder, and a conveyance direction of the web that is conveyed from the triangular plate to the cutter cylinder A guide unit that guides the imaging unit so that the imaging unit freely moves in an orthogonal direction and a phase of the cutter cylinder that are provided on the cutter cylinder Based on the rotary encoder and the imaging information of the web folded in half by the triangular plate, respectively imaged by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, And a controller for calculating a deviation in the web folding position, a deviation in the web cutting position in the cutter body, and a deviation in the folding position of the web piece in the chopper.

  According to such a folding machine of the printing press, the controller is based on the imaging information of the web folded in half by the triangular plate, respectively captured by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder. Thus, the deviation of the folding position of the web on the triangular plate, the deviation of the cutting position of the web on the cutter body, and the deviation of the folding position of the web piece on the chopper are calculated. As described above, since the deviation of the web folding position and the web cutting position in the folding machine can be detected at the same time, the printing loss can be greatly reduced as compared with the case where the operator performs visual alignment and manual alignment work. Can be reduced.

  In the folding machine of the printing press according to the present invention, the web sent to the triangular plate is provided with a pair of marks that are symmetrical with respect to the center line along the conveyance direction of the web. The web folded in half by the triangular plate is sandwiched between the triangular plate and the cutter body, and these imaging units respectively capture the front and back surfaces of the web folded in half by the triangular plate. Thus, the marks attached to the front surface and the back surface of the web are detected, respectively, and the controller detects the two marks detected by the pair of imaging units and the detected by the rotary encoder. Based on the phase of the cutter cylinder, the deviation of the web folding position on the triangular plate, the deviation of the web cutting position on the cutter cylinder, and The displacement of the folding position of the web piece in the chopper may be adapted to calculate, respectively.

  Alternatively, at least one mark is attached to the web that is sent to the triangular plate, and the pair of imaging units is located between the triangular plate and the cutter body with respect to the web that is folded in half by the triangular plate. Provided on the same side, one imaging unit detects a mark attached to the web folded in half by the triangular plate, and the other imaging unit detects a fold of the web folded in half by the triangular plate The controller is configured to detect the web folding position on the triangular plate based on the marks and folds detected by the pair of imaging units and the phase of the cutter cylinder detected by the rotary encoder. Deviation, web cutting position deviation at the cutter cylinder, and web piece folding position deviation at the chopper, respectively. You may be made to so that.

  In the web folding method of the present invention, a continuously conveyed web is folded in half by a triangular plate so as to form a fold along the conveying direction of the web, and the web folded in half by the triangular plate is The web piece cut by the cutter cylinder along the direction perpendicular to the conveying direction of the web is cut into the center line of the web piece extending in the direction orthogonal to the cutting direction of the web by the cutter cylinder by the chopper. In the method of folding a web by a folding machine of a printing press that folds in half along, a step of imaging each of the web folded in half by the triangular plate between the triangular plate and the cutter cylinder by a pair of imaging units; A step of detecting a phase of the cutter cylinder by a rotary encoder provided on the cutter cylinder; and the pair of imaging units. Based on the imaged information of the web that was imaged in half by the triangular plate and the phase of the cutter cylinder detected by the rotary encoder, the deviation of the web folding position in the triangular plate, And calculating a deviation of the cutting position of the web and a deviation of the folding position of the web piece by the chopper.

  According to such a web folding method, on the basis of the imaging information of the web that has been imaged by a pair of imaging units and folded in half by the triangular plate, and the phase of the cutter cylinder detected by the rotary encoder, The deviation of the folding position of the web, the deviation of the cutting position of the web on the cutter body, and the deviation of the folding position of the web piece on the chopper are calculated. As described above, since the deviation of the web folding position and the web cutting position in the folding machine can be detected at the same time, the printing loss can be greatly reduced as compared with the case where the operator performs visual alignment and manual alignment work. Can be reduced.

  In the web folding method of the present invention, the web sent to the triangular plate is provided with a pair of marks that are symmetrical with respect to the center line along the conveyance direction of the web. Between the triangular plate and the cutter cylinder, the web folded in half by the triangular plate is sandwiched, and these imaging units respectively capture the front and back surfaces of the web folded in half by the triangular plate Thus, the marks attached to the front and back surfaces of the web are detected, respectively, and the two marks detected by the pair of imaging units and the phase of the cutter cylinder detected by the rotary encoder are detected. On the basis of the deviation of the folding position of the web on the triangular plate, the deviation of the cutting position of the web on the cutter body, and the chopper Displacement of the folding position of the web pieces of the may be adapted to calculate, respectively.

  Alternatively, at least one mark is attached to the web that is sent to the triangular plate, and the pair of imaging units is located between the triangular plate and the cutter body with respect to the web that is folded in half by the triangular plate. Provided on the same side, one imaging unit detects a mark attached to the web folded in half by the triangular plate, and the other imaging unit detects a fold of the web folded in half by the triangular plate Based on the marks and folds detected by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the deviation of the web folding position on the triangular plate, The deviation of the cutting position of the web in the cutter body and the deviation of the folding position of the web piece in the chopper are calculated respectively. Good. Further, the detection of the fold of the web folded in half by the triangular plate may be detected by an optical detector such as a laser type edge sensor in addition to the imaging by the camera.

  According to the folding machine of the printing press and the web folding method of the present invention, it is possible to simultaneously detect the deviation of the folding position of the web and the deviation of the cutting position of the web in the folding machine. The printing loss can be greatly reduced compared to the case of performing work.

1 is a schematic configuration diagram showing an overall configuration of a printing press according to an embodiment of the present invention. It is a perspective view which shows the structure of the folding machine in the printing machine shown in FIG. It is a block diagram of the folding machine shown in FIG. FIG. 4 is a diagram showing a method for calculating a deviation of a web folding position on a triangular plate in the folding machine shown in FIGS. 2 and 3. FIG. 4 is a diagram illustrating a method of calculating a deviation of a folding position of a web piece by a chopper in the folding machine illustrated in FIGS. 2 and 3. FIG. 4 is a diagram showing a method for calculating a deviation of the cutting position of the web in the cutter body in the folding machine shown in FIGS. 2 and 3. It is a perspective view which shows the other structure of the folding machine in the printing machine shown in FIG. It is a block diagram of the folding machine shown in FIG. FIG. 9 is a diagram illustrating a method of calculating a deviation of a web folding position on a triangular plate in the folding machine illustrated in FIGS. 7 and 8. FIG. 9 is a diagram illustrating a relationship between a web folding position and a mark position on a triangular plate on an unfolded web in the folding machine illustrated in FIGS. 7 and 8. FIG. 9 is a diagram illustrating a method for calculating a deviation of a folding position of a web piece by a chopper in the folding machine illustrated in FIGS. 7 and 8. FIG. 9 is a diagram illustrating a method of calculating a deviation of the cutting position of the web in the cutter body in the folding machine illustrated in FIGS. 7 and 8.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are diagrams showing a printing press and its folding machine according to the present embodiment. Among these, FIG. 1 is a schematic configuration diagram showing the overall configuration of the printing press according to the embodiment of the present invention, FIG. 2 is a perspective view showing the configuration of the folding machine in the printing press shown in FIG. FIG. 3 is a block diagram of the folder shown in FIG. FIGS. 4 to 6 show the deviation of the folding position of the web at the triangular plate, the deviation of the folding position of the web piece at the chopper, and the cutting position of the web at the cutter cylinder in the folding machine shown in FIGS. It is a figure which shows the method of calculating each shift | offset | difference.

  First, the overall configuration of the printing press according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, a printing machine 1 according to the present embodiment includes a paper feeding unit 10 that feeds a web W, and a printing unit 12 that prints each color on the web W fed by the paper feeding unit 10. A drying device 14 that dries the web W on which each color has been printed by the printing unit 12, a web path unit 16 that adjusts the path length of the web W dried by the drying device 14 with a compensator roller 17, and a web path unit 16. And a folding machine 20 for cutting and folding the web W having the adjusted path length.

  As shown in FIG. 1, the paper supply unit 10 is provided with a roll 11 around which a web W is wound, and the web W is continuously unwound from the roll 11. A predetermined pattern is offset printed by the printing unit 12 on the web W unwound from the roll 11 of the paper supply unit 10. A cooling unit 15 having a plurality of cooling rollers 15 a is provided on the downstream side of the drying device 14. In the web path portion 16, the compensator roller 17 is movable in the left-right direction in FIG. 1, and the path length of the web W is adjusted by controlling the position of the compensator roller 17.

  Next, a specific configuration of the folding machine 20 will be described with reference to FIGS.

  As shown in FIG. 2 and the like, the folding machine 20 is provided with a triangular plate (former) 22, and the triangular plate 22 allows the web W conveyed from the web path portion 16 to be folded along the conveyance direction of the web W ( In FIG. 2, it is folded in half so as to form (indicated by the reference symbol WN). A folding roller 24 is provided on the downstream side of the triangular plate 22 in the conveyance direction of the web W, and the web W folded in half by the triangular plate 22 is folded by the folding roller 24. Further, a first nipping roller 26 and a second nipping roller 28 are provided on the downstream side of the folding roller 24 in the conveying direction of the web W, and the web W folded in half by the triangular plate 22 is provided with these nipping rollers. It is conveyed continuously while being pinched by 26,28.

  Moreover, as shown in FIG. 2 etc., the folding machine 20 is provided with a cutter cylinder 30, a folding cylinder 32, and a holding cylinder 34. The cutter cylinder 30 cuts the web W folded in half by the triangular plate 22 along a direction (longitudinal direction of the cutter cylinder 30 in FIG. 2) perpendicular to the conveyance direction of the web W. A gripping part (not shown) is provided on the outer peripheral surface of the folding cylinder 32 so that the tip of the web piece cut by the cutter cylinder 30 is gripped by the gripping part. Further, the gripping cylinder 34 is also provided with a gripping portion 34a. The gripping portion 34a of the gripping cylinder 34 chucks (grips) the center position of the web piece gripped by the gripping portion of the folding cylinder 32. The web piece is folded at the center so as to form a fold extending parallel to the cutting direction by the cylinder 30. The web piece W1 gripped by the gripping portion 34a of the holding drum 34 is transported by the transport belt 36. Further, the folding machine 20 is provided with a chopper 38, and the web piece W <b> 1 conveyed by the conveying belt 36 is further halved so as to form a fold extending in a direction perpendicular to the cutting direction by the cutter body 30 by the chopper 38. Folded. The web piece folded in half by the chopper 38 is sent to the folding roller 40 and folded by the folding roller 40 to form a final printed signature.

  Further, the folding machine 20 of the present embodiment includes a pair of imaging cameras 50 and 52 so as to sandwich the web W folded in half by the triangular plate 22 between the first nipping roller 26 and the second nipping roller 28. The front and back surfaces of the web W folded in half by the triangular plate 22 are respectively imaged by the pair of imaging cameras 50 and 52. The imaging cameras 50 and 52 are respectively provided with linear guides (guide portions) 54 and 56, and the conveyance direction of the web W conveyed from the triangular plate 22 to the cutter body 30 by these linear guides 54 and 56. The imaging cameras 50 and 52 are guided so that the imaging cameras 50 and 52 can freely move in a direction orthogonal to the vertical direction in FIGS. 2 and 3. That is, the imaging cameras 50 and 52 are guided so as to freely move along the extending direction of the linear guides 54 and 56 in FIG.

  The cutter cylinder 30 is provided with a rotary encoder 60. The rotary encoder 60 detects a rotation signal that makes the circumference of the cutter cylinder 30 one rotation. With such a rotary encoder 60, the phase of the cutter body 30 is detected.

  Further, as shown in FIG. 3, the folding machine 20 of the present embodiment is provided with a controller 70. The controller 70 includes the imaging cameras 50 and 52, the linear guides 54 and 56, the rotary encoder 60, and the like. It is connected to the. The controller 70 is configured to send imaging information of the front and back surfaces of the web W that has been imaged by the imaging cameras 50 and 52 and is folded in half by the triangular plate 22. Further, the position information of the imaging cameras 50 and 52 on the linear guides 54 and 56 is sent from the linear guides 54 and 56 to the controller 70. In addition, the phase of the cutter body 30 detected by the rotary encoder 60 is sent to the controller 70. Based on the information sent from each of these imaging cameras 50 and 52, each of the linear guides 54 and 56 and the rotary encoder 60, the controller 70 shifts the folding position of the web W on the triangular plate 22 and the web on the cutter cylinder 30. The deviation of the cutting position of W and the deviation of the folding position of the web piece W1 by the chopper 38 are calculated. Details of a calculation method of the deviation of the folding position and the cutting position by the controller 70 will be described later.

  In addition, the controller 70 is provided with a setting unit. With this setting unit, the distance between the reference position of each imaging camera 50, 52 and the reference position of the chopper 38 in the linear guides 54, 56, and each imaging camera 50. 52 are registered in the vicinity of both ends of the web W and the phase of the cutter cylinder 30 by the rotary encoder 60 when a register mark on the web W (hereinafter also referred to as a mark. Details of such a mark will be described later) are detected. The distance between the marks, the distance of the mark from the position where the signature is cut when bookbinding is set, and the like.

  As shown in FIG. 3, a controller 72 is connected to the controller 70. The controller 72 calculates the deviation of the folding position of the web W on the triangular plate 22, the deviation of the cutting position of the web W on the cutter body 30, and the deviation of the folding position of the web piece W1 on the chopper 38 calculated by the controller 70. , A web guide controller (not shown) for detecting and correcting a position shift in the left-right direction (width direction) due to the meandering of the web W, and a triangle plate adjusting device (not shown) for adjusting the position of the triangle plate 22 A chopper adjusting device (not shown) for adjusting the position of the chopper 38, the position of the compensator roller 17 and the like are controlled. More specifically, the control device 72 controls the web guide controller, the triangular plate adjusting device, and the like based on the shift of the folding position of the web W on the triangular plate 22 calculated by the controller 70. Further, the control device 72 controls the position of the compensator roller 17 based on the deviation of the cutting position of the web W on the cutter body 30 calculated by the controller 70. The control device 72 controls the chopper adjusting device and the like based on the deviation of the folding position of the web piece W1 in the chopper 38 calculated by the controller 70.

  Next, an operation of the folding machine 20 having such a configuration, specifically, a method for folding the web W will be described below.

  In the printing press 1 according to the present embodiment, a pair of marks symmetric about the center line along the conveyance direction of the web W is attached to the web W sent to the folding machine 20 in the vicinity of both ends in the width direction. It has become. In FIG. 2, a pair of marks provided in the vicinity of both ends in the width direction of the web W sent to the folding machine 20 is indicated by a reference symbol M. Such a mark is attached on the web W by the printing unit 12 of the printing machine 1, for example.

  After the web W is folded in half by the triangular plate 22, the web W is sent to the cutter body 30 through the first nipping roller 26 and the second nipping roller 28. At this time, the pair of imaging cameras 50 and 52 The mark M attached to the web W is imaged and the position of the mark M is detected. Here, as shown in FIG. 4, when the folding position of the web W is shifted when the web W is folded in half by the triangular plate 22, a pair provided near both ends in the width direction of the web W. The marks M1 and M2 are not aligned. In FIG. 4, a mark M1 indicated by a solid line is located on the front side of the paper surface of FIG. 4, and a mark M2 indicated by a dotted line is located on the back side of the paper surface of FIG. 4 to 6, the position of the chopper 38 is indicated by a two-dot chain line for reference. In FIG. 4, the fold of the web W folded by the triangular plate 22 is indicated by WN.

  In FIG. 4, the left end portions of the linear guides 54 and 56 are reference positions of the imaging cameras 50 and 52. Each of the imaging cameras 50 and 52 moves rightward from the reference position, and moves to a position facing the fold line WN of the web W folded by the triangular plate 22. Thereafter, the imaging cameras 50 and 52 are further moved rightward by a half of the distance between the pair of marks M attached by the printing unit 12. Then, the respective imaging cameras 50 and 52 respectively capture the front and back surfaces of the web W folded by the triangular plate 22, thereby detecting the marks M1 and M2 on the front and back surfaces of the web W, respectively. Accordingly, the marks M1 and M2 are moved from the reference position of each imaging camera 50 and 52 (the position of the left end portion of the linear guides 54 and 56) in the direction orthogonal to the conveyance direction of the web W (left and right direction in FIG. 4). Each distance to the position is measured. Then, the controller 70 calculates the difference between the distance between the mark M1 and the reference position of each imaging camera 50, 52 and the distance between the mark M2 and the reference position of each imaging camera 50, 52. Half of the calculated value is the amount of deviation of the folding position of the web W on the triangular plate 22. Here, when there is no positional deviation when the web W is folded in half by the triangular plate 22, the positions of the marks M1 and M2 in FIG. 4 coincide. In this case, in the controller 70, the difference between the distance between the mark M1 and the reference position of each imaging camera 50, 52 and the distance between the mark M2 and the reference position of each imaging camera 50, 52 is 0. Therefore, the deviation amount of the folding position of the web W on the triangular plate 22 is also calculated to be zero.

  Further, the controller 70 calculates the sum of the shift amount of the folding position of the web W on the triangular plate 22 and ½ of the distance between the marks M. This value is the distance from the crease WN to the mark M at the position where the web W is normally folded on the triangular plate 22. Further, by calculating the sum of this value and the distance from the bookbinding cutting register mark to the mark M, the cutting position in the width direction of the web W is determined. Then, the difference between the cutting position in the width direction of the web W and 1/2 of the cutting dimension is the distance from the reference position of the linear guides 54 and 56 to the folding position of the chopper 38.

  Next, in the folding machine 20 shown in FIG. 2 and the like, a method of calculating the deviation of the folding position of the web piece W1 by the chopper 38 by the controller 70 will be described with reference to FIG. FIG. 5 shows a case where there is no displacement when the web W is folded in half by the triangular plate 22 and the positions of the marks M attached to the front and back of the web W folded in half match. ing. The deviation of the folding position of the chopper 38 is calculated based on the difference between the cutting position in the width direction of the web W and the distance from the reference position of the linear guides 54 and 56 set in advance to the position of the chopper 38. Specifically, in FIG. 5, the folding position by the chopper 38 (indicated by the reference symbol L1 in FIG. 5) at a preset position based on the imaging information by the imaging cameras 50 and 52, and the triangle plate 22 halve it. A distance L3 is calculated between the folded web W and a center line (indicated by reference numeral L2 in FIG. 5) in the conveyance direction. The folding position L1 by the chopper 38 is fixed. In the controller 70, the distance L3 calculated in this way is the shift of the folding position of the web piece W1 in the chopper 38. That is, in FIG. 5, when the folding position L1 by the chopper 38 coincides with the center line L2 in the conveyance direction of the web W folded in half by the triangular plate 22, the folding position of the web piece W1 by the chopper 38 is The deviation amount is 0, and the folding position does not deviate when the web piece W1 is folded by the chopper 38.

  Next, in the folding machine 20 shown in FIG. 2 and the like, a method of calculating the deviation of the cutting position of the web W on the cutter body 30 by the controller 70 will be described with reference to FIG. FIG. 6 shows a case where there is no displacement when the web W is folded in half by the triangular plate 22 and the positions of the marks M attached to the front and back of the web W folded in half match. ing. In FIG. 6, the position of the mark MF imaged by the imaging cameras 50 and 52 when the cutting position does not shift in a predetermined phase of the cutter body 30 is indicated by a dotted line. When calculating the deviation of the cutting position of the web W in the cutter cylinder 30, the phase of the cutter cylinder 30 by the rotary encoder 60 when the imaging cameras 50 and 52 detect the mark M is detected. Then, a phase difference from the phase of the cutter body 30 by the rotary encoder 60 when the imaging cameras 50 and 52 detect the mark M when there is no deviation in the cutting position is calculated. Then, the controller 70 multiplies the phase difference by the resolution of the rotary encoder 60 to calculate the deviation of the cutting position of the web W in the cutter body 30. That is, in FIG. 6, the value obtained by multiplying the phase difference and the resolution of the rotary encoder 60 as described above is the mark M actually detected by the imaging cameras 50 and 52 (indicated by a solid line in FIG. 6), The distance between the target mark MF (indicated by a dotted line in FIG. 6).

  As described with reference to FIGS. 4 to 6, in the controller 70, the imaging information of the front and back surfaces of the web W folded in half by the triangular plate 22 and the rotary encoder 60 captured by the pair of imaging cameras 50 and 52. Based on the detected phase of the cutter cylinder 30, the deviation of the folding position of the web W on the triangular plate 22 (see FIG. 4), the deviation of the cutting position of the web W on the cutter cylinder 30 (see FIG. 6), and the chopper 38. The deviation (see FIG. 5) in the folding position of the web piece W1 is calculated. Then, the control device 72 detects a web position controller in the left-right direction (width direction) due to the meandering of the web based on the misalignment of the folding position and the cutting position calculated by the controller 70, and corrects it. (Not shown), a triangular plate adjusting device (not shown) for adjusting the position of the triangular plate 22, a chopper adjusting device (not shown) for adjusting the position of the chopper 38, the position of the compensator roller 17, and the like are controlled. As a result, it is possible to suppress the occurrence of web W folding or cutting misalignment in the folding machine 20.

  As described above, according to the folding machine 20 of the present embodiment, the web W folded in half by the triangular plate 22 is imaged by the pair of imaging cameras 50 and 52 between the triangular plate 22 and the cutter body 30. The phase of the cutter cylinder 30 is detected by a rotary encoder 60 provided on the cutter cylinder 30. Then, based on the imaging information of the web W folded in half by the triangular plate 22 and the phase of the cutter body 30 detected by the rotary encoder 60, the controller 70 is respectively imaged by the pair of imaging cameras 50 and 52. The deviation of the folding position of the web W on the triangular plate 22, the deviation of the cutting position of the web W on the cutter body 30, and the deviation of the folding position of the web piece W1 on the chopper 38 are calculated. As a result, it is possible to simultaneously detect the deviation of the folding position of the web W and the deviation of the cutting position of the web W in the folding machine 20, and printing loss compared to the case where the operator performs visual alignment and manual alignment work. Can be greatly reduced.

  In the folding machine 20 of the present embodiment, as described above, the web W sent to the triangular plate 22 is provided with a pair of marks M that are symmetrical with respect to the center line along the conveyance direction of the web W. The pair of imaging cameras 50 and 52 detects the marks M attached to the front and back surfaces of the web W folded in half by the triangular plate 22, respectively. Then, the controller 70 shifts the folding position of the web W on the triangular plate 22 based on the two marks M detected by the pair of imaging cameras 50 and 52 and the phase of the cutter cylinder 30 detected by the rotary encoder 60. The deviation of the cutting position of the web W at the cutter body 30 and the deviation of the folding position of the web piece W1 at the chopper 38 are calculated.

  In addition, the folding machine 20 of the printing press 1 and the web W folding method according to the present embodiment are not limited to the above-described modes, and various changes can be made.

  In the present embodiment, the pair of imaging cameras is not limited to an aspect in which the pair of imaging cameras is provided so as to sandwich the web W folded in half by the triangular plate 22. As another aspect, a pair of imaging cameras may be provided on the same side with respect to the web W folded in half by the triangular plate 22. Hereinafter, the folding machine 20a having such a configuration will be described with reference to FIGS. 7 is a perspective view showing another configuration of the folding machine in the printing machine shown in FIG. 1, and FIG. 8 is a configuration diagram of the folding machine shown in FIG. 9 to 12 show the deviation of the folding position of the web on the triangular plate, the deviation of the folding position of the web piece on the chopper, and the cutting position of the web on the cutter cylinder in the folding machine shown in FIGS. It is a figure which shows the method of calculating each shift | offset | difference. Here, FIG. 10 shows the relationship between the folding position of the web on the triangular plate and the position of the mark on the unfolded web in the folding machine shown in FIG.

  The folding machine 20a according to the modification shown in FIG. 7 and the like has a pair on the same side with respect to the web W folded in half by the triangular plate 22 between the first nipping roller 26 and the second nipping roller 28. The imaging cameras 80 and 82 are provided, and a mark on the web W folded in half by the triangular plate 22 (indicated by reference numeral M in FIG. 7) is attached by the pair of imaging cameras 80 and 82. Each surface is imaged. Each of the imaging cameras 80 and 82 is provided with a common linear guide (guide unit) 84, and the linear guide 84 transports the web W transported from the triangular plate 22 to the cutter body 30 (see FIG. 7 and FIG. 7). The imaging cameras 80 and 82 are guided so that the imaging cameras 80 and 82 can freely move in a direction orthogonal to the vertical direction in FIG. That is, each of the imaging cameras 80 and 82 freely moves along the extending direction of the linear guide 84 in FIG.

  Further, in the folding machine 20a according to the modification as shown in FIG. 7 and the like, the imaging camera 80, 82, the linear guide 84, the rotary encoder 60, and the like are connected to the controller 70. The controller 70 is configured to send imaging information of the surface of the web W marked with the triangle plate 22 and imaged by the imaging cameras 80 and 82. Further, the position information of the imaging cameras 80 and 82 on the linear guide 84 is sent from the linear guide 84 to the controller 70. In addition, the phase of the cutter body 30 detected by the rotary encoder 60 is sent to the controller 70. Based on the information sent from each of these imaging cameras 80 and 82, the linear guide 84 and the rotary encoder 60, the controller 70 shifts the folding position of the web W at the triangular plate 22, and cuts the web W at the cutter body 30. The positional deviation and the deviation of the folding position of the web piece W1 at the chopper 38 are calculated. Details of a calculation method of the deviation of the folding position and the cutting position by the controller 70 will be described later.

  Next, the operation of the folding machine 20a having such a configuration, specifically, a method for folding the web W will be described below.

  In the folding machine 20a according to the modification, one mark is attached in the vicinity of one end of the web W sent to the folding machine 20a. In FIG. 7, a mark provided on the web W sent to the folding machine 20 is indicated by a reference symbol M. Such a mark is attached on the web W by the printing unit 12 of the printing machine 1, for example.

  After the web W is folded in half by the triangular plate 22, the web W is sent to the cutter body 30 via the first nipping roller 26 and the second nipping roller 28. At this time, the triangular plate is captured by one imaging camera 80. 22, the position of the fold of the web W folded in half (indicated by reference numeral WN in FIG. 7 and the like) is detected, and the position of the mark M attached to the web W is detected by the other imaging camera 82. It has become.

  In FIG. 9, the left end portion of the linear guide 84 is the reference position for each of the imaging cameras 80 and 82. The imaging camera 80 moves to the right from the reference position and moves to a position facing the fold line WN of the web W folded by the triangular plate 22. Further, the imaging camera 82 moves further to the right from the position of the fold WN of the web W until the mark M is detected. In this way, the position of the fold WN of the web W folded in half by the triangular plate 22 is detected by one imaging camera 80, and the position of the mark M attached to the web W is determined by the other imaging camera 82. To detect. Then, the distance from the folding position of the web W on the triangular plate 22 to the mark M is calculated from the positions of the fold line WN and the mark M in the images captured by the imaging cameras 80 and 82 and the distance between the imaging cameras 80 and 82. Then, the distance from the folding position of the web W on the triangular plate 22 to the mark M and the reference dimension from the folding position of the web W on the triangular plate 22 to the mark M, calculated from the imaging information obtained by the imaging cameras 80 and 82, The amount of deviation of the folding position of the web W on the triangular plate 22 is calculated from the difference between the two. At this time, as shown in FIG. 10, the dimension between the fold line WN of the web W folded in half by the triangular plate 22 and the cutting position C is L4, and the cutting position C on the side far from the mark M and the mark M is Is L5, the distance from the folding position of the web W by the triangular plate 22 to the mark M is calculated by L4 + L5.

  The imaging camera 80 that detects the position of the fold line WN of the web W folded in half by the triangular plate 22 may be detected by detection with an optical detector such as a laser-type edge sensor.

  Further, the folding position of the web piece W1 by the chopper 38 is calculated from the shift amount of the folding position of the web W on the triangular plate 22 and the distance from the cutting position to the mark M. The deviation of the folding position of the web W by the chopper 38 is determined by the difference between the folding position of the web piece W1 by the chopper 38 and the distance of the position of the chopper 38 from the reference position of the linear guide 84 set in advance. Is calculated.

  The calculation method of the deviation of the folding position of the web W by the chopper 38 will be described in detail. In FIG. 11, the folding position by the chopper 38 at a preset position based on the imaging information by the imaging cameras 80 and 82 (FIG. 11 and a center line (indicated by reference numeral L2 in FIG. 11) in the conveyance direction of the web W folded in half by the triangular plate 22 is calculated. The folding position L1 by the chopper 38 is fixed. In the controller 70, the distance L3 calculated in this way is the shift of the folding position of the web piece W1 in the chopper 38. That is, in FIG. 11, when the folding position L1 by the chopper 38 coincides with the center line L2 in the conveyance direction of the web W folded in half by the triangular plate 22, the folding position of the web piece W1 by the chopper 38 is determined. The deviation amount is 0, and the folding position does not deviate when the web piece W1 is folded by the chopper 38.

  Next, in the folding machine 20a shown in FIG. 7 and the like, a method for calculating the deviation of the cutting position of the web W on the cutter body 30 by the controller 70 will be described with reference to FIG. FIG. 12 shows a case where there is no displacement when the web W is folded in half by the triangular plate 22, and the positions of the marks M attached to the front and back of the web W folded in half match. ing. In FIG. 12, the position of the mark MF imaged by the imaging cameras 80 and 82 when the cutting position does not shift in a predetermined phase of the cutter body 30 is indicated by a dotted line. When calculating the deviation of the cutting position of the web W in the cutter cylinder 30, the phase of the cutter cylinder 30 by the rotary encoder 60 when the imaging cameras 80 and 82 detect the mark M is detected. Then, a phase difference from the phase of the cutter body 30 by the rotary encoder 60 when the imaging cameras 80 and 82 detect the mark M when there is no deviation in the cutting position is calculated. Then, the controller 70 multiplies the phase difference by the resolution of the rotary encoder 60 to calculate the deviation of the cutting position of the web W in the cutter body 30. That is, in FIG. 12, the value obtained by multiplying the phase difference and the resolution of the rotary encoder 60 as described above is the mark M actually detected by the imaging cameras 80 and 82 (indicated by a solid line in FIG. 12), This is the distance from the target mark MF (indicated by a dotted line in FIG. 12).

  As described with reference to FIGS. 9 to 12, in the controller 70, the imaging information of the surface with the mark M on the web W folded in half by the triangular plate 22 captured by the pair of imaging cameras 80 and 82, and Based on the phase of the cutter cylinder 30 detected by the rotary encoder 60, the shift of the folding position of the web W on the triangular plate 22 (see FIG. 9) and the shift of the cutting position of the web W on the cutter cylinder 30 (see FIG. 12). And the deviation of the folding position of the web piece W1 by the chopper 38 (see FIG. 11) are calculated. Then, the control device 72 detects a web position controller in the left-right direction (width direction) due to the meandering of the web based on the misalignment of the folding position and the cutting position calculated by the controller 70, and corrects it. (Not shown), a triangular plate adjusting device (not shown) for adjusting the position of the triangular plate 22, a chopper adjusting device (not shown) for adjusting the position of the chopper 38, the position of the compensator roller 17, and the like are controlled. As a result, it is possible to prevent the web W from being folded or cut in the folding machine 20a.

  As described above, according to the folding machine 20a according to the modified example as shown in FIG. 7 and the like, it is folded in half by the triangular plate 22 by the pair of imaging cameras 80 and 82 between the triangular plate 22 and the cutter body 30. Each of the webs W is imaged, and the phase of the cutter cylinder 30 is detected by a rotary encoder 60 provided on the cutter cylinder 30. Then, based on the imaging information of the web W folded in half by the triangular plate 22 and the phase of the cutter cylinder 30 detected by the rotary encoder 60, the controller 70 is respectively imaged by the pair of imaging cameras 80 and 82. The deviation of the folding position of the web W on the triangular plate 22, the deviation of the cutting position of the web W on the cutter body 30, and the deviation of the folding position of the web piece W1 on the chopper 38 are calculated. Accordingly, it is possible to simultaneously detect the deviation of the folding position of the web W and the deviation of the cutting position of the web W in the folding machine 20a, and the printing loss compared with the case where the alignment work is performed manually by the operator and manually. Can be greatly reduced.

  Further, in the folding machine 20a according to the modified example as shown in FIG. 7 and the like, as described above, one mark M is attached to the web W sent to the triangular plate 22, and a pair of imaging cameras 80, 82 is provided on the same side between the triangular plate 22 and the cutter body 30 with respect to the web W folded in half by the triangular plate 22. One imaging camera 80 is a web folded in half by the triangular plate 22. The W fold WN is detected, and the other imaging unit 82 calculates the mark M attached to the web W folded in half by the triangular plate 22. Then, the controller 70 determines the folding position of the web W on the triangular plate 22 based on the mark M and the fold line WN detected by the pair of imaging cameras 80 and 82 and the phase of the cutter cylinder 30 detected by the rotary encoder 60. The deviation, the deviation of the cutting position of the web W at the cutter body 30, and the deviation of the folding position of the web piece W1 at the chopper 38 are calculated. In the folding machine 20a according to the modified example as shown in FIG. 7 or the like, two or more marks M may be attached to the web W sent to the triangular plate 22. In this case, the imaging camera 82 detects one specific mark M among the plurality of marks M attached to the web W.

DESCRIPTION OF SYMBOLS 1 Printing machine 10 Paper feed part 11 Roll 12 Printing unit 14 Drying device 15 Cooling part 15a Cooling roller 16 Web path part 17 Compensator roller 20, 20a Folding machine 22 Triangular plate 24 Folding roller 26 First nipping roller 28 Second nipping roller 30 Cutter body 32 Folding cylinder 34 Holding cylinder 34a Grasping part 36 Conveying belt 38 Chopper 40 Folding rollers 50 and 52 Imaging cameras 54 and 56 Linear guide 60 Rotary encoder 70 Controller 72 Controllers 80 and 82 Imaging camera 84 Linear guide

Claims (6)

A triangular plate that folds the continuously conveyed web in half to form a fold along the conveying direction of the web;
A cutter cylinder that cuts the web folded in half by the triangular plate along a direction perpendicular to the conveyance direction of the web;
A chopper that folds the web piece cut by the cutter cylinder in half along the center line of the web piece extending in a direction orthogonal to the cutting direction of the web by the cutter cylinder;
A pair of imaging units for imaging the web folded in half by the triangular plate between the triangular plate and the cutter body;
A guide unit that guides the imaging unit so that the imaging unit freely moves in a direction orthogonal to a conveyance direction of a web conveyed from the triangular plate to the cutter cylinder;
A rotary encoder provided on the cutter cylinder and detecting the phase of the cutter cylinder;
Based on the imaging information of the web folded in half by the triangular plate captured by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the web folding position of the triangular plate is determined. A controller for calculating a deviation, a deviation of the cutting position of the web in the cutter body, and a deviation of the folding position of the web piece in the chopper;
Folding machine for printing press equipped with. The web sent to the triangular plate is provided with a pair of marks that are symmetrical about the center line along the conveyance direction of the web,
The pair of imaging units are provided so as to sandwich a web folded in half by the triangular plate between the triangular plate and the cutter body, and these imaging units are formed of the web folded in half by the triangular plate. By imaging the front and back surfaces, respectively, the marks attached to the front and back surfaces of the web are detected,
Based on the two marks detected by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the controller shifts the web folding position on the triangular plate, The folding machine of a printing press according to claim 1, wherein a deviation of a cutting position of the web and a deviation of a folding position of a web piece by the chopper are respectively calculated. At least one mark is attached to the web sent to the triangular plate,
The pair of imaging units are provided on the same side of the web folded in half by the triangular plate between the triangular plate and the cutter body, and one imaging unit is folded in half by the triangular plate. The mark attached to the web is detected, and the other imaging unit detects the fold of the web folded in half by the triangular plate,
The controller, based on the marks and folds detected by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the deviation of the folding position of the web in the triangular plate, The folding machine of a printing press according to claim 1, wherein a deviation of a cutting position of the web and a deviation of a folding position of a web piece by the chopper are respectively calculated. A web that is continuously conveyed is folded in half by a triangular plate so as to form a fold along the conveying direction of the web, and the web that is folded in half by the triangular plate is along a direction perpendicular to the conveying direction of the web. A printing machine in which a web piece cut by the cutter cylinder is folded in half by a chopper along the center line of the web piece extending in a direction perpendicular to the cutting direction of the web by the cutter cylinder. In the web folding method of the folding machine,
A step of imaging each of the webs folded in half by the triangular plate between the triangular plate and the cutter body with a pair of imaging units;
A step of detecting the phase of the cutter cylinder by means of a rotary encoder provided in the cutter cylinder;
Based on the imaging information of the web folded in half by the triangular plate captured by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the web folding position of the triangular plate is determined. A step of calculating a deviation, a deviation of the cutting position of the web in the cutter body, and a deviation of the folding position of the web piece in the chopper;
Folding method with web. The web sent to the triangular plate is provided with a pair of marks that are symmetrical about the center line along the conveyance direction of the web,
The pair of imaging units are provided so as to sandwich a web folded in half by the triangular plate between the triangular plate and the cutter body, and these imaging units are formed of the web folded in half by the triangular plate. By imaging the front and back surfaces, respectively, the marks attached to the front and back surfaces of the web are detected,
Based on the two marks detected by the pair of imaging units and the phase of the cutter cylinder detected by the rotary encoder, the deviation of the web folding position on the triangular plate, the cutting position of the web on the cutter cylinder The web folding method according to claim 4, wherein the deviation of the web piece and the deviation of the folding position of the web piece at the chopper are respectively calculated. At least one mark is attached to the web sent to the triangular plate,
The pair of imaging units are provided on the same side of the web folded in half by the triangular plate between the triangular plate and the cutter body, and one imaging unit is folded in half by the triangular plate. The mark attached to the web is detected, and the other imaging unit detects the fold of the web folded in half by the triangular plate,
Based on the marks and folds detected by the pair of imaging units, and the phase of the cutter cylinder detected by the rotary encoder, the deviation of the folding position of the web in the triangular plate, the cutting position of the web in the cutter cylinder The web folding method according to claim 4, wherein the deviation of the web piece and the deviation of the folding position of the web piece at the chopper are respectively calculated.

Images