JP2009280357A - Roller clearance adjusting device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller clearance adjusting device and method for automatically adjusting the clearance between a pair of rollers to a size which is optimal for a sheet to pass through. <P>SOLUTION: The roller clearance adjusting device is provided with: a pair of insertion rollers 44 inserting a signature P chopper-folded in a predetermined position of a folding machine, at a nip part; a clearance adjusting mechanism 51 adjusting the clearance between the pair of insertion rollers 44; a motor 52 driving the clearance adjusting mechanism 51; a sensor 53 measuring the clearance between the pair of insertion rollers 44; and a controller 54 controlling a motor 52 based on the measured result of the sensor 53 so that the clearance S between the insertion rollers 44 is an optimal clearance. The controller 54 adjusts the clearance S between the insertion rollers 44 to an initial clearance S<SB>0</SB>and then controls the motor 52 so that the clearance S between the insertion rollers 44 is the optimal clearance by the clearance adjusting mechanism 51 whenever the signature P passes through between the insertion rollers 44. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gap adjusting device and method for adjusting a gap between a pair of rollers that pinch and convey a sheet. For example, the gap adjusting apparatus and method are provided in a printing machine such as an offset rotary printing machine and printed on printing paper. It is suitable for a pair of folding rollers that pressurize a crease formed by cutting and process a crease.

  In general, an offset rotary printing press uses continuous paper (web) supplied from a paper feeder as printing paper, prints with the printing device, and then folds the web vertically with a former in a folding machine. To make a compromise. Then, this signature is folded horizontally with a folding cylinder, vertically folded with a chopper blade of a chopper folding device (chopper folding), and after pressing the signature with a pair of folding rollers, the crease is processed, and the impeller The paper is discharged by a paper discharge device using

  FIG. 12 is a schematic diagram showing a conventional chopper folding device. In the conventional chopper folding apparatus, as shown in FIG. 12, the folds P conveyed from the upstream by a conveyance belt (not shown) are moved up and down by a chopper blade 103 mounted on the slit 102 of the chopper table 101. The folded fold P is folded between the pair of folding rollers 104 provided on the lower side of the chopper table 101 from the slit 102, and is passed between the folding rollers 104. The paper is sent to a paper discharge device (not shown).

  In such a chopper folding device, when the printing press is operated, the gap S between the folding rollers 104 through which the folded signature P passes is set to an appropriate value according to the thickness of the printing paper used for printing. It is necessary to adjust the interval. That is, if the gap S between the folding rollers 104 is too large, sufficient folding cannot be made on the signature P, and if the gap S between the folding rollers 104 is too small, the signature P smoothly passes between the folding rollers 104. Since it cannot pass, there exists a possibility that damage may be produced in the signature P, or conveyance of the signature P may be hindered.

  Therefore, in the conventional chopper folding device, the gap S between the folding rollers 104 can be adjusted. That is, each folding roller 104 is rotatably supported by one end (upper end) 105a of a support arm 105 that swings around the support shaft 106, and the other end (lower end) 105b of each support arm 105 can be brought close to the folding roller 104. For example, the gap S between the folding rollers 104 is enlarged, and if the other end 105b of each support arm 105 is separated, the gap S between the rollers 104 is reduced.

  A clearance adjustment mechanism 107 that restricts the approach while allowing the separation between the other ends 105b of the support arms 105 is provided. The gap adjusting mechanism 107 includes a spring 108 interposed between the other ends 105b of the support arms 105, a stopper member 109 disposed on the outer side of the other end 105b of each support arm 105, and a stopper member 109. And a screw shaft 110 for adjusting the position of the screw.

  As a result, the spring 108 biases the other end 105b of each support arm 105 in a direction separating them from each other. Further, the stopper member 109 at the other end 105 b of each support arm 105 abuts on the corresponding other end 105 b, and the other end 105 b of each support arm 105 is restricted from being separated by the urging force of the spring 108. As a result, the other ends 105b of the support arms 105 can approach each other against the biasing force of the spring 108, but the separation by the stopper member 109 is restricted. If attention is paid, each folding roller 104 is restricted from approaching more than the gap corresponding to the stopper member 109 and allowed to be separated.

  An annular portion is formed at the other end 105b of each support arm 105, and each stopper member 109 is disposed inside the corresponding annular portion of the other end 105b. Each stopper member 109 is formed with a contact surface 109c that contacts the outward surface of each other end 105b, and a female screw 109a or 109b. The stopper member 109 rotates by a rotation restricting structure (not shown). It is regulated.

  On the outer periphery of the screw shaft 110, male screws 110a and 110b are formed at a predetermined interval. One of the male screws 110a and 110b (here, the male screw 110a) is a right screw, and the other (here, the male screw 110b) is a left screw. The female screw 109a of one stopper member 109 is formed as a right-hand screw and is screwed into the male screw 110a as a right-hand screw, and the female screw 109b of the other stopper member 109 is formed as a left-hand screw and is a male screw as a left-hand screw. 110b. Further, a handle 111 that is rotated is provided at one end (right end in FIG. 4) of the screw shaft 110.

  Accordingly, if the handle 111 is operated to rotate the screw shaft 110 clockwise as viewed from the right in FIG. 4, the stopper member 109 having the right-handed female screw 109a moves to the right, and the left-handed female screw. The stopper member 109 having 109b moves to the left. That is, both stopper members 109 approach. Conversely, if the screw shaft 110 is turned counterclockwise as viewed from the right in FIG. 4, the stopper members 109 are separated from each other.

  Therefore, it is possible to adjust the gap S between the folding rollers 104 to an appropriate state by operating the handle portion 111 by manual operation.

  Further, the gap adjusting mechanism 107 using such a “screw shaft” is provided at each of the shaft end positions of one end and the other end of the folding roller 104, and by manually operating each gap adjusting mechanism 107, The gap between the folding rolls can be adjusted separately at one end and the other end of each folding roller 104.

  However, in such a technique, when adjusting the gap between the folding rollers, the screw shaft with the handle is manually rotated, which is troublesome and requires a lot of switching time to change the paper thickness of the printing paper. Since this manual switching operation is required every time the paper thickness of the printing paper is changed, there is a problem that the burden on the operator increases. In particular, manual handle operation is performed separately on both sides of the shaft end of each folding roller, so it is difficult to accurately grasp the amount of movement of the screw shaft on each side, and the parallelism of each folding roller is determined. There was a problem that it was difficult to put out. However, as for the parallelism in this case, perfect parallelism is not always preferable, and a substantially parallel state with a predetermined minute angle may be preferable.

  If the parallelism of each folding roller is not high, there will be inconveniences such as clogging or biasing between the folding rollers, which will increase the amount of waste paper. However, some degree of parallelism has to be obtained even if a large amount of time is spent, which further increases the burden on the operator and the switching time. An increase in switching time decreases the operating efficiency of the printing press.

  In this regard, the following Patent Document 1 discloses that the screw shaft of the folding roller gap adjusting mechanism can be driven by a driving means such as a motor, and the thickness of the printing paper passing between the folding rollers and the roller corresponding to the paper thickness. Based on the relationship with the appropriate gap between them, the control means controls this drive means so that the gap can be adjusted automatically, reducing the burden on the operator when changing the paper thickness of the printing paper In addition, there has been proposed a technique that can greatly reduce the switching time.

  Further, in Patent Document 2 below, the screw shaft of the gap adjusting mechanism of the folding drag roller can be driven by a driving means such as a motor, and the cutting means of the folded folded paper that passes between the rollers is controlled by the control means. Obtain the appropriate roller gap according to the paper data relating to the paper thickness and paper properties and the operation speed of the rotary press, and control the driving means so that the gap of the folding drag roller becomes this appropriate roller gap, A technique has been proposed in which gap adjustment can be automatically performed so that the burden on the operator when changing the paper thickness of the printing paper and the switching time can be greatly promoted.

JP 7-237812 A JP 2006-312497 A

  However, the technology for automatically adjusting the gap between the rollers as described in the above-mentioned Patent Documents 1 and 2 certainly reduces the burden on the operator when changing the paper thickness of the printing paper and reduces the switching time. The relationship between the thickness of the printing paper that passes between the rollers and the appropriate gap between the rollers according to this paper thickness (Patent Document 1), and the two-fold that passes between the rollers For the appropriate roller gap (Patent Document 2) according to the paper data relating to the paper thickness and physical properties of the cut printed paper and the operation speed of the rotary press, a database is obtained by conducting a number of tests in advance. It must be prepared, and in this respect, it causes a significant increase in preparation time and preparation cost.

  In addition, since the printing paper that actually passes through the gap between the two rollers is folded in two or more, the optimal gap for passing this folded printing paper (fold) is printed. It is difficult to estimate from the paper thickness and the physical properties of the paper. Therefore, it is considered that an error is inevitably generated in the appropriate gap value between rollers that is preliminarily created in a database based on the paper thickness of the printing paper, the physical properties of the paper, and the like.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and provides a roller gap adjusting device and method that can automatically adjust the gap between a pair of rollers to an optimum size for passing a sheet. The purpose is to do.

  In order to achieve the above object, a roller gap adjusting device according to a first aspect of the present invention includes a pair of rollers for nipping and conveying a sheet, a gap adjusting mechanism for adjusting a gap between the pair of rollers, and the gap An actuator for driving the adjustment mechanism, a sensor for measuring a gap between the pair of rollers, and a controller for controlling the actuator so that the gap between the rollers becomes an optimum value based on a measurement result of the sensor, The controller adjusts the gap between the pair of rollers to a preset initial value, and then the gap between the rollers becomes an optimum value by the gap adjustment mechanism every time a sheet is passed between the rollers. The actuator is controlled as described above.

  In the roller gap adjusting device according to a second aspect of the invention, the controller controls the actuator so that the gap between the rollers is largely adjusted every time a sheet is passed between the rollers.

  In the roller gap adjusting device according to a third aspect of the invention, the controller moves the pair of rollers to the maximum separated position or the maximum approach position, and then moves the actuator so that the gap between the rollers becomes an optimum value. It is characterized by control.

  In the roller gap adjusting device according to a fourth aspect of the invention, the controller includes a gap between the pair of rollers and a gap between the rollers based on a displacement amount of the roller when a sheet is passed between the rollers. The actuator is controlled so as to adjust the angle.

  In the roller gap adjusting device according to a fifth aspect of the invention, the controller has a relational expression representing a relationship between a gap between the rollers and a displacement amount of the roller when a sheet is passed between the rollers. And setting a target value for the gap between the pair of rollers based on this relational expression, and the amount of displacement of the roller when adjusted to this target value is adjusted to the optimum value. The actuator is controlled so as to achieve an optimum displacement amount.

  In the roller gap adjusting device according to a sixth aspect of the invention, the controller includes a first and a second that represent a relationship between a gap between the rollers and a displacement amount of the roller when a sheet is passed between the rollers. The first relational expression is set so that the inclination of the displacement amount of the roller with respect to the gap between the rollers is larger than that of the second relational expression, and the gap between the pair of rollers is defined as When the first target value of the gap is set based on the first relational expression and the displacement amount of the roller when adjusted to the first target value is not the optimum displacement amount, the gap between the pair of rollers is set to the second value. A second target value of the gap is set based on the relational expression, and the second target value is set as the optimum value when the displacement amount of the roller when adjusted to the second target value becomes the optimum displacement amount. It is characterized by.

  In the roller gap adjusting device according to claim 7, when the gap between the rollers measured by the sensor is within a predetermined optimum area including an optimum value, the gap becomes an optimum value. Further, the operation of the actuator is controlled to slightly move the roller.

  In the roller gap adjusting device according to an eighth aspect of the present invention, the pair of rollers is a pair of folding rollers that folds a sheet that has been chopper folded at a predetermined position of the folding machine to form a fold. It is a feature.

  According to a ninth aspect of the present invention, there is provided a roller gap adjusting device comprising a pair of rollers for nipping and conveying a sheet, a gap adjusting mechanism for adjusting a gap between the pair of rollers, and an actuator for driving the gap adjusting mechanism. And a sensor for measuring the gap between the pair of rollers, and a controller for controlling the actuator so that the gap between the rollers becomes an optimum value based on the measurement result of the sensor, After the pair of rollers are moved to a predetermined separation position or a predetermined approach position, the actuator is controlled by the gap adjustment mechanism so that the gap between the rollers becomes an optimum value. .

  Furthermore, the roller gap adjusting method according to the invention of claim 10 includes a pair of rollers for nipping and conveying a sheet, a gap adjusting mechanism for adjusting a gap between the pair of rollers, and a gap between the pair of rollers. A roller gap adjusting device comprising: a sensor for measuring; after adjusting the gap between the pair of rollers to a preset initial value by the gap adjusting mechanism, each time a sheet is passed between the rollers, the sensor The amount of displacement of the roller is measured by the above, and the gap adjusting mechanism is operated so that the gap between the rollers becomes an optimum value based on the amount of displacement.

  According to the roller gap adjusting device of the first aspect of the present invention, a pair of rollers, a gap adjusting mechanism that adjusts the gap between the rollers, an actuator that drives the gap adjusting mechanism, and a sensor that measures the gap between the rollers, And a controller that controls the actuator so that the gap between the rollers becomes an optimum value based on the measurement result of the sensor, and the controller adjusts the gap between the pair of rollers to a preset initial value, The actuator is controlled so that the gap between the rollers becomes an optimum value by the gap adjustment mechanism every time the sheet is passed. Therefore, every time a sheet passes between the rollers, the gap between the rollers is automatically adjusted so as to have an optimum value, so that the gap between the rollers can be easily optimized.

  According to the roller gap adjusting device of the second aspect of the invention, the controller controls the actuator so that the gap between the rollers is largely adjusted every time the sheet is passed between the rollers, so that the sheet passes between the rollers. By doing so, the rollers are displaced, so that the gap between the rollers can be adjusted efficiently.

  According to the roller gap adjusting device of the third aspect of the invention, the controller controls the actuator so that the gap between the rollers becomes an optimum value after moving the pair of rollers to the maximum separated position or the maximum approach position. Therefore, the roller can be appropriately moved to an appropriate position in consideration of the shakiness of the support member that supports the pair of rollers.

  According to the roller gap adjusting device of the fourth aspect of the invention, the controller adjusts the gap between the rollers based on the gap between the pair of rollers and the amount of displacement of the roller when the sheet is passed between the rollers. Since the actuator is controlled as described above, the adjustment amount of the gap between the pair of rollers can be appropriately set according to the displacement amount of the rollers.

  According to the roller gap adjusting device of the fifth aspect of the invention, the controller sets a relational expression representing the relationship between the gap between the rollers and the amount of displacement of the roller when the sheet is passed between the rollers. Set the target value of the gap between the rollers based on this relational expression so that the amount of roller displacement when adjusted to this target value becomes the optimum amount of roller displacement when adjusted to the optimum value. Since the actuator is controlled, the next target value reaching the optimum value is set by applying the measurement result of the sensor to a preset relational expression, and the target value can be easily set in a short time.

  According to the roller gap adjusting apparatus of the sixth aspect of the invention, the controller sets the first and second relational expressions, and the first relational expression indicates that the inclination of the displacement amount of the roller with respect to the gap between the rollers is the second. The gap between the pair of rollers is set to be larger than the relational expression, the first target value of the gap is set based on the first relational expression, and the amount of displacement of the roller is optimal when the first target value is adjusted. When the amount of displacement is not reached, a second target value of the gap is set based on the second relational expression for the gap between the pair of rollers, and the amount of displacement of the roller when adjusted to this second target value is the optimum amount of displacement. In this case, since the second target value is set as the optimum value, the second target value reaching the optimum value can be easily set.

  According to the roller gap adjusting device of the seventh aspect of the invention, the controller is configured so that when the gap between the rollers measured by the sensor is within a predetermined optimum region including the optimum value, the gap becomes the optimum value. Since the operation of the actuator is controlled to slightly move the rollers, the gap between the rollers can be adjusted with high accuracy.

  According to the roller gap adjusting device of the eighth aspect of the present invention, the pair of rollers is a pair of folding rollers that fold a sheet chopper-folded at a predetermined position of the folding machine at the nip portion to form a fold. The gap between the folding rollers can be easily optimized, and the product quality can be improved.

  According to the roller gap adjusting device of the ninth aspect of the present invention, the pair of rollers, the gap adjusting mechanism for adjusting the gap between the pair of rollers, the actuator for driving the gap adjusting mechanism, and the pair of rollers. A sensor for measuring the gap and a controller for controlling the actuator so that the gap between the rollers becomes an optimum value based on the measurement result of the sensor are provided, and the controller moves the pair of rollers to a predetermined separation position or a predetermined approach position. After the movement, the actuator is controlled by the gap adjusting mechanism so that the gap between the rollers becomes an optimum value. Accordingly, it is possible to appropriately move the roller to an appropriate position in consideration of the shakiness of the support member that supports the pair of rollers, and automatically to an optimum size for the sheet to pass through the gap between the pair of rollers. Can be adjusted.

  Further, according to the roller gap adjusting method of the invention of claim 10, after the gap adjustment mechanism adjusts the gap between the pair of rollers to a preset initial value, the sensor is used each time the sheet is passed between the rollers. The amount of displacement of the roller is measured, and the gap adjustment mechanism is operated so that the gap between the rollers becomes an optimum value based on the amount of displacement. Therefore, every time a sheet passes between the rollers, the gap between the rollers is automatically adjusted so as to have an optimum value, so that the gap between the rollers can be easily optimized.

  Exemplary embodiments of a folding machine and a rotary printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic configuration diagram showing a roller gap adjusting device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a chopper folding device in the folding device of the present embodiment, and FIG. FIG. 4 is a schematic view showing an offset rotary printing press according to the present embodiment, and FIGS. 5-1 to 5-3 illustrate the operation of the roller gap adjusting device according to the present embodiment. FIG. 6 is a flowchart showing the clearance adjustment control between rollers by the roller clearance adjustment device of the present embodiment, FIG. 7 is a flowchart showing sensor reading control in the clearance adjustment control between rollers, and FIG. 9 is a flowchart showing the first target value setting control in the gap adjustment control, FIG. 9 is a flowchart showing the follow-up control in the inter-roller gap adjustment control, and FIG. 10 is the first flowchart in the inter-roller gap adjustment control. Flowchart showing a target value setting control, FIG. 11 is a graph showing the roller displacement amount with respect to inter-roller gap.

  The printing press of the present embodiment is a commercial offset rotary printing press, and as shown in FIG. 4, a paper feeding device 11, an infeed device 12, a printing device 13, a drying device 14, and a cooling device 15. And a web pass device 16, a folding device 17, and a paper discharge device 18.

  The paper feeding device 11 has a reel stand on which two winding bodies (web rolls) are mounted, and a web drawn out from one winding body and traveling is used as a web of the other winding body. By connecting to the web W, it is possible to continuously supply the web W. The infeed device 12 supplies the web of the paper feeding device 11 to the printing device 13 side. The printing device 13 has four printing units 21, 22, 23, and 24 for each of four ink colors Cyan, Magenta, yellow, and black along the web running direction. Are arranged side by side. The drying device 14 is for drying the ink on the web that has been printed by the printing device 13, and the cooling device 15 is a suitable temperature for the web that stores excess heat after drying in the drying device 14. It is to cool down. The web pass device 16 conveys the dried and cooled web, and the folding device 17 cuts the web after being vertically folded and folds it to a predetermined size to form a fold. The paper discharge device 18 carries out the folded signatures out of the apparatus.

  Accordingly, the roll-shaped web W is pulled out from the winding body by the paper feeding device 11 and is supplied to the printing device 13 by the infeed device 12, and in this printing device 13, by each printing unit 21, 22, 23, 24. The multi-color printing is performed, and the printed web W is dried by the drying device 14, cooled by the cooling device 15, and folded by the folding device 17 conveyed through the web pass device 16, and then discharged. It is carried out by the paper device 18.

  Further, in the folding device 17 in the offset rotary printing press of the present embodiment, as shown in FIGS. 1 to 3, a former (triangular plate) 31 for vertically folding the web W is provided at the uppermost portion. A pair of lead-in rollers 32 and a pair of nipping rollers 33 are provided below. Below the pair of nipping rollers 33, a saw cylinder 34, a folding cylinder 35, and a saddle cylinder 36 are arranged in contact with each other in this order.

  The saw body 34 is provided with a saw blade (not shown) on its peripheral surface, and can cut the vertically folded web W to a predetermined length. The folding cylinder 35 is provided with a needle device (not shown) on its peripheral surface, and this needle device operates in conjunction with the rotation of the folding cylinder 35 and cuts the needle by protruding outward at a predetermined position. While holding the leading end in the running direction of the web W, the holding of the leading end of the web W can be released by returning the needle at a predetermined position. Further, the folding cylinder 35 is provided with an insertion blade (not shown) on the peripheral surface thereof, and the cutting web W is laterally folded at the center in the conveying direction by protruding the insertion blade outward at a predetermined position. can do. The saddle drum 36 is provided with a gripping device (not shown) on its peripheral surface, and this gripping device is operated in conjunction with the rotation of the saddle drum 36 and is protruded from the peripheral surface of the folding drum 35 by the insertion blade. The center portion of the web W can be held and folded horizontally by this holding mechanism.

  Accordingly, the web W is vertically folded by the former 31 and then guided and conveyed by the lead-in roller 32 and the nipping roller 33. When the web W enters between the saw cylinder 34 and the folding cylinder 35, the web W is in a predetermined position. The needle device is actuated to project the needle outward, whereby the tip of the web W is pierced and held. When the folding cylinder 35 continues to rotate in this state, the web W moves while being held on the peripheral surface of the folding cylinder 35. Then, the web W is cut horizontally by a saw blade at a predetermined position. Subsequently, the needle device is actuated to return the needle, thereby releasing the holding of the tip of the web W, and the insertion blade projecting outward from the circumferential surface of the folding cylinder 35, so that the web W is folded. 35 is peeled off from the circumferential surface. Then, the web W protruding from the peripheral surface of the folding drum 35 is gripped by the gripping mechanism of the collar drum 36, whereby a signature (sheet) P is formed.

  A chopper folding device 37 for chopper folding the signature P is provided adjacent to the collar drum 36. In the chopper folding device 37, a chopper table 38 is disposed horizontally, and the chopper table 38 is arranged in a horizontal direction perpendicular to the conveying direction of the signature P by a guide rail (not shown), that is, along the width direction of the signature P. And is supported movably. An upper transport conveyor 39 and a lower transport conveyor 40 are disposed above the chopper table 38. Each of the conveyors 39 and 40 includes an endless conveyor belt, a plurality of guide rollers, and a drive motor. The conveyors 39 and 40 are sandwiched from above and below the signature P released by the rod cylinder 36 to a predetermined position on the chopper table. Can be transported.

  The chopper table 38 has a slit 41 formed at a predetermined position thereof, and a stopper 42 is provided adjacent to the downstream side in the conveyance direction of the signature P from the slit 41. The stopper 42 defines the chopper folding position when the tip of the signature P conveyed by the conveyors 39 and 40 abuts. Above the slit 41, a chopper blade 43 that contacts the central portion of the signature contacting the stopper 42 and pushes into the slit 41 is disposed. The chopper blade 43 is supported by a chopper arm (not shown) so as to be rotatable in the vertical direction.

  A pair of folding rollers 44 are provided below the chopper table 38 so as to be opposed to the lower side of the slit 41 so as to sandwich and fold the signatures P lowered from the slit 41 by nip pressure.

  Accordingly, the folded signature P that has been folded into four by the folding drum 35 and the saddle drum 36 is transported on the chopper table 38 by the upper and lower transport conveyors 39 and 40, and stops at the position where the tip end abuts against the stopper 42. . Then, the chopper blade 43 is lowered with respect to the signature P that stops at the reference position on the chopper table 38 by a drive device (not shown), and the central portion of the signature P is pushed into the slit 41 of the chopper table 38, The folding roller 48 sandwiches the folded sheet P and passes it while folding, so that the folded sheet P is finally folded in eight.

  Further, the folding device 17 according to the present embodiment is provided with a roller gap adjusting device that can appropriately adjust the gap S between the folding rollers 44 according to the paper thickness or quality of the web W used for printing. It has been. This roller gap adjusting device adjusts the gap between the pair of folding rollers 44. The optimum value (optimum gap) of the gap between the folding rollers 44 is set according to the thickness of the signature P, but the folding roller 44, the folding roller 44 is worn by a support member, the spring is bent, etc. As a result, the optimum gap varies. On the other hand, an optimal displacement amount when the signature P passes between the pair of folding rollers 44 is set. In the roller gap adjusting device of this embodiment, this displacement amount is optimal (optimum displacement amount). The optimum gap can be easily adjusted.

  That is, as described above, the chopper folding device 37 folds the signature P that has been transported from the upstream side while folding it on the chopper table 38 by the chopper blade 43 that moves up and down mounted on the slit 41 of the chopper table 38. The folded signature P is fed between the pair of folding rollers 44 from the slit 41. The folds P that have passed through the gap between the folding rollers 44 are pressed by the pair of folding rollers 44, processed into folds, and sent below the folding rollers 44.

  The roller gap adjusting device of this embodiment is for adjusting the gap between the folding rollers 44. As shown in FIG. 1, a gap adjusting mechanism 51 for adjusting the gap between the pair of rollers 44, and the gap adjustment. The electric motor (actuator) 52 that drives the mechanism 51, the sensor 53 that measures the gap S between the pair of rollers 44, the operation of the offset rotary printing press, and the gap S based on the measurement result of the sensor 53. And a controller 54 for controlling the operation of the motor 52 so that the optimum gap is obtained.

  Each folding roller 44 is rotatably supported by one end (upper end in FIG. 1) 62a of a support arm 62 that swings around the support shaft 61, and the other end (lower end in FIG. 1) of each support arm 62. ) 62b approaches the gap between the folding rollers 44, and if the other end 62b of each support arm 62 is separated, the gap between the folding rollers 44 decreases. The gap adjusting mechanism 51 is configured to restrict the approach while allowing the other ends 62b of the support arms 62 to be separated from each other.

  That is, the gap adjusting mechanism 51 is disposed on the outside of the other end 62b of each support arm 62 and the spring (biasing member) 63 interposed between the other ends 62b of each support arm 62. A movable stopper member 64 that abuts the end 62b and a screw shaft 65 that adjusts the position of each stopper member 64 are provided.

  When the pair of folding rollers 44, the support arm 62, and the stopper member 64 are distinguished from each other, one of them (the left side in FIG. 1) is the first folding roller 44A, the first support arm 62A, and the first stopper. The other member (right side in FIG. 1) is referred to as a member 64A, and is referred to as a second folding roller 44B, a second support arm 62B, and a second stopper member 64B.

  Accordingly, in the gap adjusting mechanism 51, the other ends 62b of the support arms 62A and 62B are urged in the direction of being separated from each other by the spring 63, and the movement in the direction of being separated from each other by the stopper members 64A and 64B. It is regulated. As a result, the other ends 62b of the support arms 62A and 62B can approach each other against the biasing force of the spring 63, but the movement in the separation direction is restricted by the stopper members 64A and 64B. Yes. If attention is paid to the gaps between the folding rollers 44A and 44B, the folding rollers 44A and 44B are restricted from approaching the gaps corresponding to the stopper members 64A and 64B and allowed to be separated.

  In this embodiment, an annular portion is formed at the other end 62b of each support arm 62A, 62B, and each stopper member 64A, 64B is disposed inside the annular portion at the other end 62b of each support arm 62A, 62B. Has been. Each stopper member 64A, 64B is formed with a contact surface 64c that contacts the outward surface of each other end 62b, and a female screw 64a or 64b. The rotation of 64B is restricted.

  On the outer periphery of the screw shaft 65, a first male screw 65a and a second male screw 65b are formed at a predetermined interval. The first male screw 65a is a right screw, and the second male screw 65b is a left screw. On the other hand, the first female screw 64a of the first stopper member 64A is formed as a right screw and is screwed into the male screw 65a of the right screw, and the second female screw 64b of the second stopper member 64B is formed as a left screw. Screwed into the male screw 65b of the screw. Further, a motor 52 that rotationally drives the screw shaft 65 is connected to one end (right end in FIG. 1) of the screw shaft 65.

  Accordingly, when the motor 52 is driven to rotate the screw shaft 65 clockwise as viewed from the right in FIG. 1, the first stopper member 64A having the right-handed female screw 64a moves to the right, and the left-handed female screw The second stopper member 64B having the screw 64b moves to the left. That is, both stopper members 64A and 64B approach. Conversely, if the screw shaft 65 is turned counterclockwise when viewed from the right in FIG. 1, the stopper members 64A and 64B are separated from each other.

  The sensor 53 that measures the gap S between the pair of folding rollers 44 may be a sensor that directly measures the gap S between the folding rollers 44 without contact, but the gap S between the folding rollers 44 is determined by the support arm 62A. , 62B corresponds to the distance between the movement positions in the height direction on the one end 62a side or the other end 62b side, and the inclination angle of both the support arms 62A, 62B. Based on this, the gap S between the rollers 44 may be calculated.

  The support shaft 61 and the support arm 62, the gap adjusting mechanism 51, the motor 52, and the sensor 53 are provided at both one end and the other end of each supported folding roller 44A, 44B. The gaps between the rollers 44A and 44B are individually adjusted at one end and the other end thereof.

  The controller 54 controls the operation of the rotary offset printing press and the motor 52 in accordance with a preset program. However, regarding the adjustment of the gap between the rollers, if there is a predetermined change in the printing conditions, each of the rollers 44A and 44B is controlled. At the end, clearance adjustment processing is executed.

  Here, the printing conditions are the type of printing paper (including the paper thickness) used for printing, the number of pages of the signature P that enters between the folding rollers 44 (corresponding to how many layers are folded) or Folded state (vertical fold or horizontal fold state), printing ink transfer state (for example, including the printing line drawing rate and ink transfer thickness, etc.) and printing atmosphere (for example, temperature and humidity during printing) In any case, the thickness of the signature P entering between the rollers 44 can be changed.

  That is, if the thickness of the printing paper changes, the thickness of the signature P entering between the folding rollers 44 changes, and the thickness of the signature P changes if the number of pages with the signature changes, and the signature is changed. Even if the number of pages of P does not change, if the type of printing paper is changed, the folded bulk changes, so that the substantial thickness of the signature P changes and the folding state of the signature P changes. The substantial thickness of the signature P changes. In addition, although the printing line plate rate for printing is higher or the ink transfer thickness is larger, the substantial thickness of the signature P increases, and conversely, the lower the line drawing rate is, The smaller the transfer thickness, the smaller the substantial thickness of the signature P. That is, the substantial thickness of the signature P also depends on the ink transfer state of printing. The substantial thickness of the signature P also depends on the printing atmosphere such as temperature and humidity during printing.

  When it is determined from such printing conditions that the thickness of the signature P entering between the rollers 44 can be changed, the clearance between the rollers is adjusted. In the present embodiment, when the type of printing paper used for printing changes, or when the number of pages or folding state of the signature P entering between the folding rollers 44 changes, the thickness of the signature P can always change. It is determined that the thickness of the signature P can also be changed when the ink transfer state of printing changes to a preset reference or when the printing atmosphere changes to a preset reference or more.

  The controller 54 has a function of determining whether or not the thickness of the signature P can be changed when the next operating condition of the printing press is input, and it is determined that the thickness of the signature P can be changed. When the previous printing is finished and the printing machine is stopped, the control is performed according to the control program so as to control the adjustment of the gap between the folding rollers 44.

  Hereinafter, the roller gap adjustment control by the roller gap adjusting device of the present embodiment will be described in detail based on the flowcharts of FIGS.

In the inter-roller gap adjustment control by the roller gap adjustment device of this embodiment, as shown in FIG. 6, first, in step S11, the operator presses the “automatic adjustment” button while the printing press is stopped. The alarm buzzer sounds and the lamp of the “automatic adjustment” button is displayed in step S12. In step S13, the controller 54 determines whether the gap S between the folding rollers 44 by the sensor 53 is measured is below initial distance gap S ₀ is set in advance. The initial gap is given according to the above printing conditions. When the rough thickness of the signature P is estimated from the above printing conditions and the signature P is passed between the folding rollers 44 in the next process, The gap between the rollers 44 is preset so that the distance between the folding rollers 44 is surely smaller than the thickness of the signature P. For example, from the above printing conditions, the type of printing paper used for printing, the number of pages of folding P entering between the folding rollers 44, and the folding state are each divided into several ways, and a rough summary of the folding P from these combinations. The thickness may be estimated, but the operator may select and input one corresponding to the printing condition from several preset initial distances.

In step S13, the controller 54, when the gap S between the folding rollers 44 by the sensor 53 is measured is determined not to be the initial clearance _{S 0} or less, at step S14, by driving the motor 52, the pair of folding rollers 44 Each folding roller 44 is moved at high speed by the support arm 62 in a direction in which the gap is narrowed. Then, at step S15, the gap S between the folding rollers 44 by the sensor 53 is measured, if it is determined in the initial gap S ₀ and became a distance obtained by adding a predetermined value a, in step S16, stops the motor 52 . Subsequently, in step S17, each folding roller 44 is moved at a low speed by the support arm 62 in a direction in which the gap between the pair of folding rollers 44 is narrowed. Then, at step S18, the gap S between the folding rollers 44 by the sensor 53 is measured, when it is judged to have become the initial clearance _{S 0,} at step S19, it stops the motor 52.

On the other hand, in step S13, the controller 54, when the gap S between the folding rollers 44 by the sensor 53 is measured is determined that the initial gap S ₀ or less, at step S20, by driving the motor 52, the pair folding Each folding roller 44 is moved at a high speed by the support arm 62 in a direction in which the gap between the rollers 44 becomes wider. Then, at step S21, the gap S between the folding rollers 44 by the sensor 53 is measured, if it is determined in the initial gap S ₀ and became a distance obtained by subtracting a predetermined value a, in step S22, stops the motor 52 . Subsequently, in step S23, each folding roller 44 is moved at a low speed by the support arm 62 in a direction in which the gap between the pair of folding rollers 44 is widened. Then, at step S24, the gap S between the folding rollers 44 by the sensor 53 is measured, when it is judged to have become the initial clearance _{S 0,} at step S19, it stops the motor 52.

When the gap S between the pair of folding rollers 44 folding rollers 44 is positioned so that the initial clearance S _0, then in step S25, reads the sensor values. That is, as shown in FIG. 7, when the printing press is started and moved slowly in step S31, the signature P which has been printed, cut and folded into a predetermined state is sent to the chopper folding device 37. Then, the signature P is chopper-folded by the chopper blade 43 and the folded signature P enters between the folding rollers 44. In this case, the slow operation speed is set to 12 rpm or less, which is significantly lower than the normal operation speed of 800 rpm.

Then, during the slow operation of the printing press, the gap between the folding rollers 44 is preset to an initial gap S ₀ smaller than the thickness of the signature P, and when the signature P enters between the folding rollers 44, The folding roller 44 is displaced so as to be separated while compressing the spring 63 according to the thickness of the signature P. In step S32, the sensor 53 measures and stores the distance (gap) s between the rollers when the folding rollers 44 are separated most. In this case, only one part of the signature P is passed through the gap between the folding rollers 44, and the distances s ₁ , s ₂ , s ₃ ... The gap) s is stored as s ₁ , s ₂ , s ₃ . If it is determined in step S33 that the folding roller 44 has rotated a predetermined n times, the printing press is stopped in step S34.

Returning to FIG. 6, in step S25, When the sensor value is read, at step S26, it sets a first target gap _{S 1.} That is, as shown in FIG. 8, based on the distances s ₁ , s ₂ , s ₃ ... Detected by the sensor 53 in step S41, the first target gap is set based on a preset first relational expression. setting the S _1. More specifically, first, the distances s ₁ , s ₂ , s ₃ ... Between the obtained folding rollers 44 are averaged to calculate the gap average value S, and the initial gap S ₀ is calculated from the gap average value S. by subtracting to calculate the initial amount of displacement y _0.

By the way, the controller 54 determines the displacement amount y of the folding roller 44 when the folding sheet P passes between the gap S between the folding rollers 44 and the folding roller 44 in accordance with the printing conditions in consideration of the thickness of the folding sheet P. Have the first and second relational expressions. As shown in FIG. 11, this relational expression is a graph showing the folding roller displacement amount with respect to the gap S between the folding rollers. The first relational expression f ₁ is the inclination theta of folding rollers displacement y for the clearance S between the folding rollers is set to theta _1. The second relational expression f ₂ are inclination theta of folding rollers displacement y for the clearance S between the folding rollers is set to theta _2. The slope θ _{1 of} the first relational expression f ₁ is defined to be larger than the slope θ _{2 of} the second relational expression f ₂ .

Then, when setting the first target gap _{S 1} following the initial clearance _{S 0} applies the first relational expression _{f 1} (inclination theta _1). That is, when the intersection C ₀ is defined from the initial gap S ₀ and the initial displacement amount y ₀ , the first relational expression f ₁ is defined using the slope θ ₁ . The intersection of the first relational expression f ₁ and the horizontal axis (folding roller displacement) becomes the first target gap S _1.

Returning to FIG. 8, in step S <b> 42, the motor 52 is driven, and each folding roller 44 is moved at high speed by the support arm 62 in the direction in which the gap between the pair of folding rollers 44 is widened. Then, in step S43, When the gap S between the folding rollers 44 by the sensor 53 is measured, it is determined to become a gap obtained by adding a predetermined value b to the first target clearance S _1, at step S44, the motor 52 Stop. Subsequently, in step S45, each folding roller 44 is moved at a low speed by the support arm 62 in a direction in which the gap between the pair of folding rollers 44 is narrowed. Then, at step S46, the gap S between the folding rollers 44 by the sensor 53 is measured, when it is judged to have become the first target clearance _{S 1,} at step S47, the stop motor 52.

That is, when moving the pair of folding rollers 44 in a position to maintain the initial gap S ₀ to a first target gap S ₁ between a position, as shown in Figure 5-1, between the pair of folding rollers 44 From the state in which the folding roller 44 is positioned so that the gap S becomes the initial gap S ₀ , the pair of folding rollers 44 are moved away from each other by the motor 52, and as shown in FIG. Stop at position. At this time, the gap S between the folding rollers 44 is the maximum separation gap Smax = S ₁ + b. Next, the pair of folding rollers 44 are moved toward each other by the motor 52 from the position of the folding roller 44 where the gap S between the pair of folding rollers 44 is the maximum separation position Smax, as shown in FIG. Then, it stops at a predetermined approach position. In this case, the gap S between the folding rollers 44, a first target clearance _{S 1.} In this way, by moving the pair of folding rollers 44 to the first target gap S ₁ between a position after moved to a predetermined separation position, between the folding rollers 44 and the support arm 62 backlash, the support shaft 61 It is possible to eliminate errors due to the backlash between the support arm 62 and the sliding resistance with the spring 63.

Returning to FIG. 6, in step S26, After moving to a position where the pair of folding rollers 44 becomes the first target gap S _1, at step S27, it executes the thrust program. When the execution program is finished, an alarm buzzer sounds and in step S28, an “automatic adjustment end” button lamp is displayed. That is, as shown in FIG. 9, when the operator presses the “push” button in step S51 (or automatically after the processing of S47), the sensor value is read in step S52. This process is the same as the process in step S25. As shown in FIG. 7, in step S31, the printing press is started to perform a slow operation, and the chopper folded folds P are inserted between the folding rollers 44. Let it enter. At this time, the folding rollers 44 are displaced so as to be separated according to the thickness of the signature P. In step S32, the sensor 53 measures and stores the distance (gap) between the rollers when the folding rollers 44 are separated most. If it is determined in step S33 that the folding roller 44 has rotated a predetermined n times, the printing press is stopped in step S34.

Returning to FIG. 9, in step S <b> 53, it is determined whether or not the displacement amount y of the folding roller 44 at this time is within a predetermined optimum region including the optimum gap Sx between the folding rollers 44. That is, first, the gap average value S detected by the sensor 53 is calculated, and the first displacement y ₁ is calculated by subtracting the first target gap S ₁ from the gap average value S. Then, it is determined the first displacement y ₁ is greater than the value obtained by subtracting a predetermined value c in the optimum displacement y _x, and, whether the optimal displacement y _x smaller than the value obtained by adding a predetermined value c. Here, the first displacement y ₁ is if it is determined that there is no optimal region, at step S54, sets the second target gap S _2.

That is, as shown in FIG. 10, in step S61, the first target gap _{S 1} and based on the first displacement _{y 1,} the second target gap _{S 2} based on the second equation _{f 2} set in advance Set. As shown in FIG. 11, when the intersection C ₁ first target gap S ₁ from the first displacement y ₁ is defined, the second relational expression f ₂ with inclination theta ₂ is defined. The intersection of the second relational expression f ₂ and the horizontal axis (folding roller displacement) becomes the second target gap S _2.

Returning to FIG. 10, in step S <b> 62, the motor 52 is driven, and each folding roller 44 is moved at high speed by the support arm 62 in the direction in which the gap between the pair of folding rollers 44 is widened. Then, in step S63, When the gap S between the folding rollers 44 by the sensor 53 is measured, it is determined to become a gap obtained by adding a predetermined value b to the second target gap S _2, at step S64, the motor 52 Stop. Subsequently, in step S65, each folding roller 44 is moved at a low speed by the support arm 62 in a direction in which the gap between the pair of folding rollers 44 is narrowed. Then, at step S66, the gap S between the folding rollers 44 by the sensor 53 is measured, when it is judged to have become the second target gap _{S 2,} at step S67, the stop motor 52.

Returning to Figure 9, in step S54, When the second target clearance S ₂ is set a pair of folding rollers 44 to move to that position, at step S51, again, when the operator presses the "thrust" button (or , Automatically after the processing of S47), the sensor value is read in step S52. Since this process is the same as that described above, a description thereof will be omitted. Then, in step S53, it is determined whether or not the displacement amount y of the folding roller 44 at this time is within a predetermined optimum region including the optimum gap Sx between the folding rollers 44. That is, first, the average clearance S detected by the sensor 53 is calculated, and the second displacement y ₂ is calculated by subtracting the second target clearance S ₂ from the average clearance S. Then, it is determined the second displacement y ₂ is larger than the value obtained by subtracting a predetermined value c in the optimum displacement y _x, and, whether the optimal displacement y _x smaller than the value obtained by adding a predetermined value c. Here, the second displacement y ₂ is if it is determined that there is no optimal region, at step S54, sets the third target gap S _3.

Processing for setting a third target gap S _3, since it is almost the same as the process for setting the second target gap S _2, detailed description thereof is omitted. Incidentally, when setting the third target gap S _3, as shown in FIG. 11, based on a second target gap S ₂ based on the second displacement y _2, the third relational expression f ₃ which is set in advance the third sets the target gap _{S 3} Te. That is, when the intersection C ₂ is defined from the second target gap S ₂ and the second displacement y ₂ , the third relational expression f ₃ is defined using the inclination θ ₃ . The intersection of the third relational expression f ₃ and the horizontal axis (folding roller displacement) becomes the third target gap S _3. In this case, the inclination theta ₂ of the second relational expression f ₂ inclination theta ₃ of the third relational expression f ₃ is set to the same slope.

Returning to FIG. 9, on the other hand, at step S53, the second displacement y _2, greater than the value obtained by subtracting a predetermined value c in the optimum displacement y _x, and, by adding a predetermined value c in the optimum displacement y _x If it is determined that the value is smaller than the value, the final target gap _Sx is set in step S55. In step S56, the motor 52 is driven with respect to the final target gap _Sx . That is, as described above, the motor 52 is driven, and the folding rollers 44 are moved at high speed by the support arm 62 in the direction in which the gap between the pair of folding rollers 44 is widened and stopped. Subsequently, each folding roller 44 is moved at a low speed by the support arm 62 in a direction in which the gap between the pair of folding rollers 44 becomes narrow, and the gap S between the folding rollers 44 measured by the sensor 53 becomes the final target gap _Sx . Then, the motor 52 is stopped.

Operation, it is desirable to gap adjusting folding rollers 44 and fine movement, the gap between the folding rollers 44 to adjust the gap S between the pair of folding rollers 44 from the second target clearance S ₂ to the final target gap S _x S can be adjusted to the optimum gap.

Incidentally, in step S53, when the displacement y is determined to not enter the optimal area, less than the value obtained by subtracting a predetermined value c to the displacement amount y is the optimum displacement y _x (lower limit 0), This means that the gap S between the folding rollers 44 is too large, and the target gap S is reset. On the other hand, is larger than a value obtained by adding a predetermined value c to the displacement amount y is the optimum displacement y _x, the gap S between the folding rollers 44 it means that is still small, sets a new target clearance S.

As described above, in the roller gap adjusting device according to the present embodiment, the pair of folding rollers 44 that fold the chopper folded at the predetermined position of the folding machine at the nip portion, and the pair of folding rollers 44. A gap adjusting mechanism 51 that adjusts the gap between the pair of folding rollers 44, a motor 52 that drives the gap adjusting mechanism 51, a sensor 53 that measures the gap between the pair of folding rollers 44, and a distance between the folding rollers 44 based on the measurement result of the sensor 53. The controller 54 controls the motor 52 so that the gap S becomes the optimum gap. The controller 54 adjusts the gap S between the folding rollers 44 to a preset initial gap S ₀ , and then the folding roller 44. Every time the signature P is passed, the motor 52 is controlled by the gap adjusting mechanism 51 so that the gap S between the folding rollers 44 becomes the optimum gap.

  Therefore, every time the signature P passes between the folding rollers 44, the gap S between the folding rollers 44 is easily optimized by automatically adjusting the gap S between the folding rollers 44 to be the optimum gap. be able to. That is, when the printing condition is changed and the thickness of the signature P entering between the folding rollers 44 is changed, the printing press is actually operated (slowly operated), and the signature P is passed between the folding rollers 44. Since the optimum gap is set based on the measured gap between the folding rollers 44 and the gap between the folding rollers 44 is adjusted to this optimum gap, the gap between the folding rollers 44 can be reliably optimized.

  At this time, since the gap between the folding rollers 44 is automatically adjusted through the controller 54, the burden on the operator can be reduced and the gap can be optimized very easily. Further, since it is automated to determine whether or not to adjust the gap between the folding rollers 44 and to set the initial gap between the folding rollers 44 at the time of this gap adjustment, it is necessary to prepare a certain database. However, since it is not necessary to prepare an enormous database, preparation time and preparation cost for preparing the database are greatly reduced, and an increase in burden on this point can be reduced.

  Further, in the roller gap adjusting device of this embodiment, the controller 54 controls the motor 52 so that the gap between the folding rollers 44 is largely adjusted every time the signature P is passed between the folding rollers 44. Yes. Therefore, since the folding roller 44 is displaced when the signature P passes between the folding rollers 44, the gap between the folding rollers 44 can be adjusted efficiently.

  Further, in the roller gap adjusting device of this embodiment, the controller 54 controls the motor 52 so that the gap between the folding rollers 44 becomes the optimum gap after moving the pair of folding rollers 44 to the maximum separation position. ing. Accordingly, errors due to a support member that supports the pair of folding rollers 44, that is, play between the folding rollers 44 and the support arm 62, play between the support shaft 61 and the support arm 62, sliding resistance with the spring 63, and the like. The folding roller 44 can be appropriately moved to an appropriate position.

  Further, in the roller gap adjusting device of this embodiment, the controller 54 is based on the gap between the pair of folding rollers 44 and the amount of displacement of the folding roller 44 when the signature P is passed between the folding rollers 44. The motor 52 is controlled so as to adjust the gap between the folding rollers 44. Therefore, the adjustment amount of the gap between the folding rollers 44 can be appropriately set according to the amount of displacement of the folding rollers 44.

  In the roller gap adjusting device of this embodiment, the controller 54 represents the relationship between the gap between the folding rollers 44 and the amount of displacement of the folding roller 44 when the signature P is passed between the folding rollers 44. A relational expression is set, a target gap between the folding rollers 44 is set based on this relational expression, and the amount of displacement of the folding roller 44 when adjusted to the target gap is optimized for the folding roller when adjusted to the optimum gap. The motor 52 is controlled so as to obtain a displacement amount. Therefore, the next target gap is set by applying the measurement result of the sensor 53 to a preset relational expression, and the target gap can be easily set in a short time.

  Further, in the roller gap adjusting device of the present embodiment, the controller 54 sets the first and second relational expressions, and the first relational expression is set so that the displacement amount of the folding roller 44 is inclined with respect to the gap between the folding rollers 44. The displacement of the folding roller 44 when the first target gap is set based on the first relational expression and the gap between the folding rollers 44 is set to be larger than the second relational expression. When the amount does not become the optimum displacement amount, the second target gap is set based on the second relational expression, and when the displacement amount of the folding roller 44 when adjusted to the second target gap becomes the optimum displacement amount, 2 The target gap is set as the optimum gap. Accordingly, the second target gap can be easily set.

  Further, in the roller gap adjusting device of the present embodiment, when the gap between the folding rollers 44 measured by the sensor 53 is within a predetermined optimum area including the optimum gap, this gap becomes the optimum gap. In this way, the operation of the motor 52 is controlled to slightly move the folding roller 44. Therefore, the gap between the folding rollers 44 can be adjusted with high accuracy.

  In the above-described embodiment, the roller according to the present invention has been described as the folding roller 44 that presses the chopper-folded signature and processes the crease. However, the present invention is not limited to this, and the folding blade of the folding cylinder is not limited thereto. It may be applied to other crease processing rollers such as a downward drag roller for processing a crease by pressurizing a fold folded horizontally. Furthermore, the roller of the present invention is for conveying a sheet while sandwiching the sheet, and may not be used for a folding machine.

  In the above-described embodiment, the gap adjusting mechanism of the present invention is a screw type, but is not limited to this structure. The actuator also depends on the configuration of the gap adjustment mechanism. However, the actuator is not limited to the electric motor as in the above embodiment, but is a fluid pressure motor such as a pneumatic motor or a hydraulic motor, or a fluid pressure cylinder such as a pneumatic cylinder or a hydraulic cylinder. An electric or fluid pressure driven linear motor or the like may be applied.

  The roller gap adjusting device and method according to the present invention can automatically adjust the gap between a pair of rollers to an optimum size for the sheet to pass through. Can be applied.

It is a schematic block diagram showing the clearance gap adjustment apparatus of the roller which concerns on one Example of this invention. It is a schematic block diagram of the chopper folding apparatus in the folding apparatus of a present Example. It is a perspective view of the chopper folding apparatus in the folding apparatus of a present Example. It is the schematic showing the offset rotary printing press of a present Example. It is the schematic showing the action | operation of the gap adjustment apparatus of the roller of a present Example. It is the schematic showing the action | operation of the gap adjustment apparatus of the roller of a present Example. It is the schematic showing the action | operation of the gap adjustment apparatus of the roller of a present Example. It is a flowchart showing the clearance gap adjustment control between rollers by the clearance gap adjustment apparatus of a present Example. It is a flowchart showing the sensor reading control in the clearance gap adjustment control between rollers. It is a flowchart showing the 1st target value setting control in the clearance gap adjustment control between rollers. It is a flowchart showing follow-up control in gap adjustment control between rollers. It is a flowchart showing the 1st target value setting control in the clearance gap adjustment control between rollers. It is a graph showing the roller displacement amount with respect to the clearance gap between rollers. It is the schematic showing the conventional chopper folding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Infeed apparatus 13 Printing apparatus 14 Drying apparatus 15 Cooling apparatus 16 Web pass apparatus 17 Folding apparatus 18 Paper delivery apparatus 37 Chopper folding apparatus 38 Chopper table 41 Slit 43 Chopper blade 44 Folding roller (roller)
51 Clearance adjustment mechanism 52 Motor (actuator)
53 Sensor 54 Controller 62 Support arm 63 Spring member 64 Stopper 65 Screw shaft W Web (sheet)
P eclectic (sheet)

Claims (10)

A pair of rollers for nipping and conveying the sheet;
A gap adjusting mechanism for adjusting a gap between the pair of rollers;
An actuator for driving the gap adjusting mechanism;
A sensor for measuring a gap between the pair of rollers;
A controller for controlling the actuator so that a gap between the rollers becomes an optimum value based on a measurement result of the sensor, and
After the controller adjusts the gap between the pair of rollers to a preset initial value, the gap adjustment mechanism causes the gap between the rollers to be an optimum value each time a sheet is passed between the rollers. Controlling the actuator;
A roller gap adjusting device characterized by the above.   2. The roller gap adjusting device according to claim 1, wherein the controller controls the actuator so that a gap between the rollers is largely adjusted every time a sheet is passed between the rollers.   2. The controller according to claim 1, wherein the controller controls the actuator so that a gap between the rollers becomes an optimum value after moving the pair of rollers to a predetermined separation position or a predetermined approach position. The roller gap adjusting device according to 2.   The controller controls the actuator to adjust a gap between the rollers based on a gap between the pair of rollers and a displacement amount of the roller when a sheet is passed between the rollers. The roller gap adjusting device according to any one of claims 1 to 3.   The controller has a relational expression representing a relationship between a gap between the rollers and a displacement amount of the roller when a sheet is passed between the rollers, and the gap between the pair of rollers is represented by this relationship. The target value of the gap is set based on the equation, and the actuator is controlled so that the displacement amount of the roller when adjusted to the target value becomes the optimum displacement amount of the roller when adjusted to the optimum value. The roller gap adjusting device according to claim 4.   The controller has first and second relational expressions representing a relation between a gap between the rollers and a displacement amount of the roller when a sheet is passed between the rollers. The inclination of the displacement amount of the roller with respect to the gap between the rollers is set to be larger than the second relational expression, and the gap between the pair of rollers is set to a first target value of the gap based on the first relational expression. When the amount of displacement of the roller when adjusted to the first target value is not the optimum amount of displacement, the second target value of the gap is set based on the second relational expression for the gap between the pair of rollers. 6. The roller gap according to claim 5, wherein when the displacement amount of the roller when adjusted to the second target value becomes an optimum displacement amount, the second target value is set as an optimum value. Adjustment device.   When the gap between the rollers measured by the sensor is within a predetermined optimum region including the optimum value, the controller controls the operation of the actuator so that the gap becomes the optimum value, and makes the rollers minute. The roller gap adjusting device according to any one of claims 1 to 6, wherein the roller gap adjusting device moves.   8. The pair of rollers according to claim 1, wherein the pair of rollers is a pair of folding rollers that folds a sheet that has been chopper-folded at a predetermined position of the folding machine at a nip portion to form a fold. The roller gap adjusting device according to claim 1. A pair of rollers for nipping and conveying the sheet;
A gap adjusting mechanism for adjusting a gap between the pair of rollers;
An actuator for driving the gap adjusting mechanism;
A sensor for measuring a gap between the pair of rollers;
A controller for controlling the actuator so that a gap between the rollers becomes an optimum value based on a measurement result of the sensor, and
The controller controls the actuator so that the gap between the rollers becomes an optimum value by the gap adjustment mechanism after the pair of rollers is moved to a predetermined separation position or a predetermined approach position.
A roller gap adjusting device characterized by the above. A pair of rollers for nipping and conveying the sheet;
A gap adjusting mechanism for adjusting a gap between the pair of rollers;
A sensor for measuring a gap between the pair of rollers;
In a roller gap adjusting device comprising:
After adjusting the gap between the pair of rollers to a preset initial value by the gap adjustment mechanism, the displacement amount of the roller is measured by the sensor every time a sheet is passed between the rollers, Operating the gap adjusting mechanism so that the gap between the rollers becomes an optimum value based on
A roller gap adjusting method characterized by the above.

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