JP2008195507A - Clearance adjustment device and method of roller for crease working of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically adjust a clearance to the optimum size without requiring huge database in a device and a method for adjusting a clearance of rollers for working crease on a signature by a printing machine. <P>SOLUTION: The clearance adjustment device is provided with a pair of crease working rollers 14, 14 installed on the printing machine 2, pressing the signature 1 and working the crease; a clearance adjustment mechanism 17 for adjusting the clearance between these rollers; an actuator 22 for driving the clearance adjustment mechanism 17; a sensor 23 for measuring the clearance; and a controller 24 for controlling operation of the printing machine 2 and the actuator 22. When the printing condition is changed, the controller 24 adjusts the clearance such that it becomes an initial stage distance according to the printing condition before the usual operation of the printing machine 2, and relaxing-operates the printing machine 2. The controller 24 passes the signature 1 between the rollers, sets the optimum value of the clearance based on a measurement value of the clearance obtained from the sensor 23 at this time, and controls operation of the actuator 22 such that the clearance becomes the optimum value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is an apparatus for adjusting a gap between a pair of crease processing rollers that are provided in a printing press such as a rotary offset printing press and pressurize a crease formed by being printed and cut on a printing paper to process a crease. It is about the method.

  Generally, in a printing press such as a rotary offset printing press, a continuous paper (web) supplied from a paper feeding device is used as printing paper, and printing is performed by the printing device. The former is folded vertically (folded in the direction along the conveying direction), cut into a folded state, and then folded in a folding cylinder (folded in a direction perpendicular to the conveying direction). Further, there is a type in which the paper is further folded vertically (chopper-folded) by a chopper device, and after a crease is pressed by a pair of chopper rollers to process the crease, the paper is ejected by a paper ejection device using an impeller or the like.

  In addition, the folding machine of the rotary printing press is composed of a former (triangular plate), a folding cylinder and a saw cylinder, and a pair of folding drag rollers from the upstream side, and the web is vertically folded (folded along the longitudinal direction) with the former. After cutting, the web is cut with a folding cylinder and a saw cylinder, further folded with a folding blade of the folding cylinder (folded along the cutting direction), and the crease is pressed with a lower drag roller, Some of them are sequentially sent to an impeller device and a conveying device downstream of the folding machine.

Both the chopper roller and the folding drag roller are common in that they function as a crease processing roller (nipping roller) that presses the crease to process the crease.
The crease processing roller will be described by taking the chopper device that performs the chopper folding as an example. For example, as shown in FIG. 3, the signature 1 that has been transported from the upstream by the transport belt 11 is transferred to the slit 12 a of the chopper table 12. A pair of chopper rollers (folding rollers) provided on the lower side of the chopper table 12 from the slit 12a is folded on the chopper table 12 by a chopper blade 13 that moves upward and downward. 14, 14 is passed between the two, and is sent to a paper discharge device (not shown) provided below the chopper rollers 14,14.

  In such a chopper roller, when the printing press is operated, the gap between the chopper rollers 14 and 14 through which the folded signature 1a 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 between the chopper rollers 14 and 14 is too large, a sufficient crease cannot be made in the signature 1a, and if the gap between the chopper rollers 14 and 14 is too small, the signature 1a moves between the rollers 14 and 14. Since it cannot pass smoothly, there exists a possibility that damage may arise in the signature 1a or a trouble may arise in conveyance of the signature 1a.

  Therefore, in such a chopper device, for example, as shown in FIG. 4, the gap d between the chopper rollers 14 and 14 can be adjusted. In the structure shown in FIG. 4, each of the rollers 14 and 14 is rotatably supported by one end (upper end) 15 a of a support arm 15 that swings around the support shaft 16, and the other end ( If the lower end 15b is approached, the gap d between the rollers 14 and 14 is enlarged, and if the other end 15b of each support arm 15 is separated, the gap d between the rollers 14 and 14 is reduced. Yes.

  A clearance adjusting mechanism 17 is provided that restricts the approach while allowing the one end 15a of each support arm 15 to be separated. In this structural example, the gap adjusting mechanism 17 includes a spring 18 interposed between the other ends 15b of the support arms 15, and a stopper member 19 disposed outside the other end 15b of each support arm 15. A screw shaft 20 for adjusting the position of the stopper member 19 is provided.

  As a result, the spring 18 biases the other end 15b of each support arm 15 in the direction of separating from each other. Further, the stopper member 19 at the other end 15 b of each support arm 15 abuts on the corresponding other end 15 b, and the other end 15 b of each support arm 15 is restricted from being separated by the urging force of the spring 18. Thereby, the other ends 15b of the support arms 15 can approach each other against the urging force of the spring 18, but the separation by the stopper member 19 is restricted. Paying attention to the above, the rollers 14 and 14 are restricted from approaching more than the gap corresponding to the stopper member 19 and allowed to be separated.

  In this example, an annular portion is formed at the other end 15b of each support arm 15, and each stopper member 19 is disposed inside the corresponding annular portion at the other end 15b. Each stopper member 19 is formed with a contact surface 19c that contacts the outward surface of each other end 15b, and a female screw 19a or 19b. Each stopper member 19 is rotated by a rotation restricting structure (not shown). Is regulated.

  On the outer periphery of the screw shaft 20, male screws 20a and 20b are formed at a predetermined interval. One of the male screws 20a and 20b (here, the male screw 20a) is a right screw, and the other (here, the male screw 20b) is a left screw. The female screw 19a of one stopper member 19 is formed as a right-hand screw, and is screwed into the male screw 20a of the right-hand screw. The female screw 19b of the other stopper member 19 is formed as a left-hand screw, and the male screw of the left-hand screw. 20b. Furthermore, a handle 21 for rotating is provided at one end of the screw shaft 20 (the right end in FIG. 4).

  Accordingly, when the handle 21 is operated to rotate the screw shaft 20 clockwise as viewed from the right in FIG. 4, the stopper member 19 having the right-handed female screw 19a moves to the right, and the left-handed female screw. The stopper member 19 having 19b moves to the left. That is, both stopper members 19 and 19 approach. Conversely, if the screw shaft 20 is turned counterclockwise when viewed from the right in FIG. 4, the stopper members 19 and 19 are separated from each other.

Therefore, it is possible to adjust the gap d between the rollers 14 and 14 to an appropriate state by operating the handle portion 21 by manual operation.
Further, the gap adjusting mechanism 17 using such a “screw shaft” is provided at each of the shaft end positions of the one end and the other end of the chopper rollers 14, 14, and by manually operating each mechanism 17, The gap between the rolls can be adjusted separately at one end and the other end of each chopper roller 14, 14.
Note that the gap adjusting mechanism similar to the gap adjusting mechanism 17 is also provided for the above-described folding drag roller.

  However, in such a technique, when the gap between the rollers is adjusted, the above-described screw shaft with the handle is manually rotated, so that it takes time and a long switching time is required for changing the paper thickness of the printing paper. In addition, each time the thickness of the printing paper is changed, this manual switching operation is required, which increases the burden on the operator.

  In particular, manual handle operation is performed separately on both sides of the shaft end of each chopper roller, so it is difficult to accurately grasp the amount of movement of the screw shaft on each side, and the parallelism of each chopper 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.

  And if the parallelism of each chopper roller is not out, inconveniences such as clogging or biasing between the chopper rollers will occur, and this will cause an increase in waste paper, so a lot of time 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, Patent Document 1 discloses that the screw shaft of the gap adjusting mechanism of the chopper roller can be driven by a driving means such as a motor, and the paper thickness of the printing paper passing between the rollers and the roller interval corresponding to the paper thickness. Based on the relationship with the appropriate gap, 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, the screw shaft of the gap adjusting mechanism of the folding drag roller is driven by a driving unit such as a motor, and the control unit prints the cut folded paper that passes between the rollers. Obtain the appropriate roller gap according to the paper data related to the thickness and physical properties of the paper and the operating speed of the rotary press, and automatically 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 the gap adjustment can be performed by the method, and the burden on the operator when changing the paper thickness of the printing paper and the switching time can be greatly reduced.
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.

  The present invention has been devised in view of such a problem, and when changing the printing conditions, it is not necessary to have an enormous database, and the optimal size for the crease to pass through the gap between the two crease processing rollers. Another object of the present invention is to provide a gap adjusting device and a gap adjusting method for a crease processing roller of a printing machine, which can be adjusted automatically.

  In order to achieve the above object, a crease processing roller gap adjusting device according to the present invention (Claim 1) is provided in a printing machine, and is a crease formed by cutting printed printing paper. For a pair of crease processing rollers that pressurize the crease, a clearance adjustment mechanism that adjusts a clearance between the crease processing rollers, an actuator that drives the clearance adjustment mechanism, and the pair of crease processing rollers A controller for controlling the operation of the printing press, and a controller for controlling the operation of the actuator so that the clearance becomes an optimum value based on a measurement result of the sensor. When the printing conditions are changed, before the normal operation of the printing press, the operation of the actuator is controlled so that the gap becomes an initial distance according to the printing conditions. Then, the printing machine is operated slowly, and the optimum value of the gap is determined based on the measured value of the gap obtained from the sensor when the fold passes between the pair of crease rollers. It sets, and the operation of the actuator is controlled so that the gap becomes the optimum value.

The crease processing roller is a chopper roller that presses a fold that has been chopper-folded to process the fold, or a fold-down drag roller that presses a fold that has been folded horizontally by a fold blade of a fold cylinder to process the fold. (Claims 2 and 3).
The controller performs a slow operation of the printing machine and measures the gap when the signature passes between the pair of crease processing rollers with respect to a plurality of preset signatures. It is preferable to set the optimum value of the gap based on the average value of the plurality of measurement values obtained thereby.

Furthermore, it is preferable that the controller sets a value obtained by reducing the measured value by a minute amount based on the measured value as the optimum value of the gap.
The gap adjusting mechanism includes a biasing member that applies a biasing force to the pair of crease processing rollers in a direction that regulates the enlargement of the gap, and a direction that regulates the reduction of the gap facing the biasing member. Preferably, the actuator includes a movable stopper member that contacts a support member of a pair of crease rollers, and a position adjustment member that adjusts a position of the movable stopper member, and the actuator drives the position adjustment member. 6).

  In this case, the movable stopper member includes a first stopper member that contacts the support member of one of the pair of crease processing rollers and a second stopper member that contacts the support member of the other roller, and The first stopper member and the second stopper member are processed with female screws in opposite directions, and the position adjusting member is a male screw that engages with the female screws of the first stopper member and the second stopper member. Are respectively processed screw shafts, and the first stopper member and the second stopper member are arranged so that the first stopper member and the second stopper member approach or separate as the screw shaft rotates. It is preferable that the rotation is restricted (claim 7).

Further, the gap adjusting mechanism, the actuator, and the sensor are provided on one end side and the other end side of the pair of crease processing rollers, respectively, and the controller is based on the measured values from the sensors. It is preferable to control the operation of each actuator.
The printing conditions include the type of printing paper (including paper thickness), the number of pages of the folds entering the pair of crease rollers (corresponding to how many folds are folded), or Folded state (longitudinal fold or horizontal fold state), ink transfer state of the printing (for example, including the printing line drawing rate and ink transfer thickness, etc.) and the printing atmosphere (for example, the temperature during printing, (Including humidity and the like) is preferably included (claim 9).

  According to the present invention, there is provided a method for adjusting a gap between crease forming rollers of a printing press (Claim 10), which is provided in a printing press and presses a crease into a crease formed by cutting printed printing paper. The crease processing roller is provided with a clearance adjustment mechanism for adjusting a clearance between the crease processing rollers and an actuator for driving the clearance adjustment mechanism. Before the operation, the actuator is operated to adjust the gap so that the gap becomes an optimum value. The gap adjustment method of the crease processing roller of the printing press is such that the gap becomes an initial distance according to the printing conditions. And a step of slowly operating the printer to measure the size of the gap when the fold passes between the pair of crease rollers. An optimum value setting step for setting an optimum value of the gap based on the measurement value obtained by the measurement step, and then the optimum value for which the gap is set by the optimum value setting step; And a gap adjusting step for operating the actuator.

  A clearance adjustment method for a crease processing roller of a printing press according to the present invention (Claim 11) uses the clearance adjustment device for a crease processing roller of a printing press according to any one of Claims 1 to 9. When the printing conditions are changed, the controller operates the actuator to adjust the gap so that the gap becomes an optimum value before normal operation of the printing press. In the adjustment method, a preparation step of operating the actuator so that the gap becomes an initial distance according to the printing conditions, and then, the printing press is operated slowly so that the gap between the pair of crease processing rollers is reached. A measurement step of measuring the size of the gap when the compromise passes, and then an optimum value for setting the optimum value of the gap based on the measurement value obtained by the measurement step A constant step, then, the gap is characterized in that it includes a, a gap adjustment step for actuating the actuator so that the optimum value set by the optimal value setting step.

  In addition, it is preferable to stop the said printing machine once after the said measurement step.

  According to the crease processing roller gap adjusting device (claim 1) and the gap adjusting method (claims 10 and 11) of the present invention, when the printing conditions are changed, the printer is actually operated to The optimum value of this gap is set based on the measured value of the gap between the rollers obtained by passing the crease between the crease processing rollers, and the gap is adjusted to this set optimum value. Can be reliably optimized. In particular, since the gap adjustment can be automatically performed through the controller, the gap can be optimized very easily. In addition, since it is not necessary to prepare a database, preparation time and preparation cost for preparing the database become unnecessary, and the burden on this point can be reduced.

The controller operates the printing machine slowly, passes a plurality of creases between the crease rollers, and sets the optimum value of the gap based on the average value of the plurality of measured values obtained thereby. Therefore, the optimum value of the gap can be set with higher accuracy.
In addition, the controller can set the optimum value of the gap with higher accuracy by setting the value obtained by reducing the measured value by a minute amount as the optimum value of the gap (claim 5).

  The gap adjusting mechanism includes a biasing member that applies a biasing force in a direction that regulates the enlargement of the gap between the rollers, a movable stopper member that contacts each crease processing roller in a direction that regulates the reduction of the gap, and a movable stopper member The gap between the rollers is regulated to a minimum value according to the movable stopper member, but if the thickness of the fold is larger than this gap, the fold is not Since the gap can be expanded to a size corresponding to the crease against the urging member, the printer can be operated slowly to pass the crease between the crease processing rollers. By making the initial distance of the gap smaller than the thickness of the signature, the size of the clearance corresponding to the signature can be reliably measured.

Of course, during normal operation of the printing press, if the value obtained by reducing the measured value by a minute amount is set as the optimum value of the gap (Claim 5), it is possible to press the signature with an appropriate pressure when passing between the rollers. Thus, the required crease processing can be carried out while smoothly transporting the folds (claim 6).
In this case, the movable stopper member is composed of a first stopper member that abuts on the support member of the one crease processing roller and a second stopper member that abuts on the support member of the other crease processing roller, and the position adjusting member is a screw. If the shaft is used so that the first stopper member and the second stopper member approach or separate as the screw shaft rotates, the gap between the crease processing rollers can be adjusted easily and accurately. (Claim 7)

  In addition, if a clearance adjustment mechanism, an actuator, and a sensor are provided on each of one end side and the other end side of the pair of crease processing rollers, and the operation of each actuator is controlled by the controller based on the measured value from each sensor. It is possible to easily and appropriately realize the adjustment of the gap between the rollers to the required parallelism (usually not completely parallel but substantially parallel with a slight angle) (Claim 8).

  The thickness of the signature for setting the initial distance of the gap is the printing condition, that is, the type of the printing paper (including the paper thickness), and the thickness of the signature that enters the pair of crease processing rollers. Number of pages (corresponding to how many folds are folded) or folded state (vertical fold or lateral fold state), ink transfer state of the printing (for example, printing line rate of printing, ink transfer thickness, etc.) And the printing atmosphere (for example, including temperature and humidity at the time of printing), etc. (Claim 9).

  Further, if the printing press is stopped once after the step of measuring the size of the gap (measurement step), the gap adjustment can be performed while suppressing the generation of waste paper.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a clearance adjusting device and a clearance adjusting device for a crease forming roller of a printing press according to an embodiment of the present invention. FIG. 1 is a configuration diagram showing the clearance adjusting device, and FIG. It is a flowchart which shows the clearance gap adjustment method.

(Device configuration)
The crease processing roller according to the present embodiment is a chopper roller installed downstream of the chopper device described as the conventional example. As shown in FIG. 3, the chopper device is installed in a rotary printing machine such as a commercial offset rotary printing machine, and the signature 1 that has been transported by the transport belt 11 from the upstream is installed above the slit 12 a of the chopper table 12. A pair of chopper rollers (folding rollers) 14 provided on the lower side of the chopper table 12 from the slit 12a while the folded fold 1a is folded on the chopper table 12 by the chopper blade 13 that moves up and down. 14, and the signature 1 a that has passed through the gap between the chopper rollers 14, 14 is pressed by the chopper rollers 14, 14 to be processed into a crease, and below the chopper rollers 14, 14. It is sent to a provided paper discharge device (not shown).

  The crease processing roller gap adjusting device of the printing press according to the present embodiment adjusts the gap between the chopper rollers (hereinafter also simply referred to as rollers) 14 and 14, as shown in FIG. A gap adjusting mechanism 17 that adjusts the gap between the rollers 14 and 14, an electric motor (actuator) 22 that drives the gap adjusting mechanism 17, a distance sensor 23 that measures the gap d between the pair of rollers 14 and 14, A controller 24 is provided for controlling the operation of the printing press 2 and for controlling the operation of the motor 22 so that the gap d becomes an optimum value based on the measurement result of the sensor 23.

  Also in this embodiment, each of the rollers 14 and 14 is rotatably supported by one end (upper end) 15a of the support arm 15 that swings around the support shaft 16, and the other end ( If the lower end 15b is approached, the gap between the rollers 14 and 14 is enlarged, and if the other end 15b of each support arm 15 is separated, the gap between the rollers 14 and 14 is reduced. The gap adjusting mechanism 17 is configured to restrict the approach while allowing the one end 15a of each support arm 15 to be separated.

That is, the gap adjusting mechanism 17 is disposed outside the other end 15b of each support arm 15 and the spring (biasing member) 18 interposed between the other ends 15b of each support arm 15, respectively. A movable stopper member 19 that contacts the end 15b and a screw shaft (position adjusting member) 20 that adjusts the position of each stopper member 19 are provided.
When the pair of rollers 14 and 14, the support arms 15 and 15, and the stopper members 19 and 19 are distinguished from each other, one of them (the left side in FIG. 1) is connected to the first roller 14A and the first support arm 15A. , The first stopper member 19A and the other side (right side in FIG. 1) are called the second roller 14B, the second support arm 15B, and the second stopper member 19B.

  Therefore, in the gap adjusting mechanism 17, the other ends 15b of the support arms 15A and 15B are urged in the direction of being separated from each other by the spring 18, while the stopper members 19A and 19B are moved in the direction of being separated from each other. It is regulated. Thus, the other ends 15b of the support arms 15A and 15B can approach each other against the biasing force of the spring 18, but the movement in the separation direction is restricted by the stopper members 19A and 19B. Yes. If attention is paid to the gaps between the rollers 14A and 14B, the rollers 14A and 14B are restricted from approaching more than the gaps corresponding to the stopper members 19A and 19B and allowed to be separated.

  In this example, an annular portion is formed at the other end 15b of each support arm 15A, 15B, and each stopper member 19A, 19B is disposed inside the annular portion at the other end 15b of each support arm 15A, 15B. ing. Each stopper member 19A, 19B is formed with a contact surface 19c that contacts the outward surface of each other end 15b, and a female screw 19a or 19b. , 19B are restricted in rotation.

  A first male screw 20a and a second male screw 20b are formed on the outer periphery of the screw shaft 20 at a predetermined interval. The first male screw 20a is a right screw, and the second male screw 20b is a left screw. On the other hand, the first female screw 19a of the first stopper member 19A is formed as a right screw, and is screwed into the male screw 20a of the right screw, and the second female screw 19b of the second stopper member 19B is formed as a left screw. The left screw male screw 20b is screwed. Further, a motor 22 that rotationally drives the screw shaft 20 is connected to one end (right end in FIG. 1) of the screw shaft 20.

  Accordingly, when the motor 22 is operated and the screw shaft 20 is rotated clockwise as viewed from the right direction in FIG. 1, the first stopper member 19A having the right-handed female screw 19a moves to the right, and the left-handed screw The second stopper member 19B having the female screw 19b moves to the left. That is, both stopper members 19A and 19B approach. Conversely, if the screw shaft 20 is turned counterclockwise when viewed from the right in FIG. 1, the stopper members 19A and 19B are separated from each other.

  The sensor 23 that measures the gap d between the pair of rollers 14 and 14 may be a sensor that directly measures the gap between the rollers 14 and 14 in a non-contact manner. 15 and 15 corresponds to the distance between the moving positions in the height direction on one end 15a side or the other end 15b side, and the inclination angle of both support arms 15A and 15B. Based on this, the gap d between the rollers 14 and 14 may be calculated.

The support shaft 16 and the support arm 15, the gap adjustment mechanism 17, the motor 22 and the sensor 23 are provided at both one end and the other end of each of the supported rollers 14A and 14B. The gaps 14A and 14B are adjusted separately at one end and the other end thereof.
The controller 24 controls the operation of the printing machine 2 and the motor 22 according to a preset program. However, regarding the adjustment of the gap between the rollers, if there is a predetermined change in the printing conditions, each end of the rollers 14A and 14A is controlled. The gap adjustment process is executed.

  Here, the printing conditions are the type of printing paper used for printing (including the paper thickness), the number of pages of the signature 1a entering between the rollers 14 and 14 (corresponding to how many layers are folded). Or folded state (longitudinal fold or lateral fold state), printing ink transfer state (for example, including the printing line drawing rate and ink transfer thickness, etc.) and printing atmosphere (for example, printing temperature, All of which are conditions under which the thickness of the signature 1a entering between the rollers 14 and 14 can change.

  That is, if the paper thickness of the printing paper changes, the thickness of the signature 1a entering between the rollers 14 and 14 changes, and the thickness of the signature 1a changes if the number of pages of the signature 1a changes. Even if the number of pages of the fold 1a does not change, if the type of printing paper changes, the volume in the folded state changes, so the substantial thickness of the fold 1a changes, and the folded state of the fold 1a changes. However, the substantial thickness of the signature 1a varies. Furthermore, although the print line ratio of the printing plate is high or the transfer thickness of the ink is large, the substantial thickness of the signature 1a increases. The smaller the transfer thickness, the smaller the substantial thickness of the signature 1a. That is, the substantial thickness of the signature 1a also depends on the ink transfer state of printing. The substantial thickness of the signature 1a 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 1a entering between the rollers 14 and 14 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 1a entering between the rollers 14 and 14 changes, the thickness of the signature 1a always changes. It is determined that the thickness of the signature 1a can change even when the ink transfer state of the printing changes to a preset standard or when the printing atmosphere changes to a preset standard or more. .

  The controller 24 has a function (determination unit) for determining whether or not the thickness of the signature 1a can be changed when the next operating condition of the printing press is input. The thickness of the signature 1a is determined by this determination unit. When it is determined that the change can be made, when the previous printing is finished and the printing press is stopped, the control is performed according to the control program so as to control the adjustment of the gap between the rollers 14 and 14 as shown in FIG. The processing step configuration will be described below with reference to FIG.

(Processing step configuration)
That is, first, when the determination unit determines that the thickness of the signature 1a can be changed, and ends the previous printing and stops the printing press 2, this control is started. First, the gap between the rollers 14 and 14 is set to an initial distance while the printing press 2 is stopped (step S10). The initial distance is given according to the printing conditions described above. The rough thickness of the signature 1a is estimated from the printing conditions, and the signature 1a is passed between the rollers 14 and 14 in the next step. At this time, the gap between the rollers 14 and 14 is preset so that the distance between the rollers 14 and 14 is surely smaller than the thickness of the signature 1a. Therefore, this initial distance may be given very roughly.

  Here, based on the printing conditions described above, the type of printing paper used for printing, the number of pages of the signature 1a entering between the rollers 14 and 14, and the folding state are divided into several ways, and the signature 1a is determined based on these combinations. The rough thickness may be estimated, but the operator may select and input one according to printing conditions from several preset initial distances.

  Next, the controller 24 sends the signature 1 that has been printed, cut, and folded into a predetermined state to the chopper device while starting the printing machine 2 and operating it slowly. In the chopper device, the chopper blade 13 folds the signature 1 and causes the folded signature 1a to enter between the rollers 14 and 14 (step S20). In this case, the slow operation speed is set to 20 rpm or less, which is significantly lower than the normal operation speed of 800 rpm.

  During this slow operation, the gap between the rollers 14 and 14 is reliably preset in a state smaller than the thickness of the signature 1a in the previous step (step S10), so the signature 1a is placed between the rollers 14 and 14. When entering, the rollers 14 and 14 are separated while compressing the spring 18 according to the thickness of the signature 1a. The sensor 23 measures the distance between the rollers 14 and 14 at the most distance or the value of the parameter corresponding thereto, and detects or calculates the distance between the rollers 14 and 14 through which the signature 1a can pass without a gap ( Step S30).

  In the present embodiment, the crease 1a is passed through the gap between the rollers 14 and 14 by a predetermined number of copies (several parts, for example, 3 parts) (step S40), and a plurality of measurements for the distance d between the rollers 14 and 14 is performed. The result (or calculation result) dm is obtained. When the distance dm between the plurality of rollers 14 and 14 is obtained, the printing press 2 is temporarily stopped (step S50), and an average value dav of the obtained distance dm between the plurality of rollers 14 and 14 is calculated (step S60). .

  Next, a target value (optimum value of the gap) dt of the gap d between the rollers 14 and 14 is set based on the average value dav of the distance between the rollers 14 and 14 (step S70). In this embodiment, the target value (optimum value of the gap) dt (= k · dav, where k <1) is obtained by multiplying the average value dav of the distance d between the rollers 14 and 14 by a coefficient k slightly smaller than 1. In addition, k≈1) is calculated. In order to allow the crease 1a to pass through the gap between the rollers 14 and 14 and pass the crease 1a smoothly, the gap is slightly smaller than the thickness of the crease. This is because it is preferable to make it smaller. If the gap between the rollers 14 and 14 is equal to the thickness of the fold 1a, the applied pressure for making a crease is not sufficient, and if the gap between the rollers 14 and 14 is too narrow relative to the thickness of the fold 1a, The signature 1a cannot be passed smoothly. The target value (optimum value of the gap) dt (= dav−s, where 0 <s << 1) is calculated by subtracting the minute value s from the average value dav of the distance d between the rollers 14 and 14. Good.

Then, the distance d between the rollers 14 and 14 is adjusted according to the set target value (optimum value of the gap) dt. That is, by operating the motor 22 and rotating the screw shaft 20 by a predetermined angle in a predetermined direction and adjusting the distance between the stopper members 19A and 19B, the other ends (lower ends) of the support arms 15A and 15B. The interval of 15b is adjusted, and the interval of one end (upper end) 15a of support arms 15A and 15B which support each roller 14A and 14B is adjusted. As a result, the distance d between the rollers 14 and 14 is adjusted to the target value (optimum value of the gap) dt.
The adjustment of the distance d between the rollers 14 and 14 is performed at one end and the other end of the rollers 14 and 14, respectively.

(Function and effect)
Since the gap adjusting device and the gap adjusting method for the crease processing roller of the printing press according to the embodiment of the present invention are configured as described above, the folding condition is changed and the crease entering between the rollers 14 and 14 is changed. When the thickness of 1a changes, the measured value (or measurement) of the gap between the rollers 14 and 14 obtained by actually operating the printer (slow operation) and passing the signature 1a between the rollers 14 and 14 is measured. Since the target value (optimum value) dt of this gap is set based on the calculated value) dm based on the result and the gap d between the rollers 14 and 14 is adjusted to this set target value (optimum value) dt, the roller 14 and 14 can be reliably optimized.

  Further, since the measurement of the gap is performed while the printing press is operated slowly, the generation of damaged paper is small. In the case of this embodiment, the distance between the rollers 14 and 14 is measured through a plurality of (for example, three) copies of the signature 1a, and these measurement results are averaged to obtain a measured value of the distance between the rollers 14 and 14. For this reason, the distance between the rollers 14 and 14 can be obtained with higher accuracy, but even in this case, the generation of damaged paper is only a few (several parts).

  Further, since the gap between the rollers 14 and 14 is automatically adjusted through the controller 24, the gap can be optimized very easily by reducing the burden on the operator. In the present embodiment, since determination of whether or not to adjust the gap between the rollers 14 and 14 and the setting of the initial distance between the rollers 14 and 14 at the time of this gap adjustment are automated, a certain amount of database is stored. Although it is necessary to prepare, since it is not necessary to prepare a huge database, preparation time and preparation cost for preparing the database are greatly reduced, and an increase in burden on this point can be reduced.

In addition, since the target value (optimum value) dt of the gap is set to a value slightly smaller than the measurement result (average value) dav of the distance between the rollers 14 and 14, additional necessary for making a crease in the fold 1a. It is possible to smoothly pass the signature 1a between the rollers 14 and 14 while applying pressure.
Further, in the present embodiment, after the step of measuring the size of the gap (measurement step), the gap adjustment is performed after the printing press 2 is stopped once, so that the occurrence of damaged paper is suppressed. The gap can be adjusted.

  Further, for example, as shown in FIG. 3, the signature 1a entering between the rollers 14 and 14 has one end (right side in the drawing) of the rollers 14 and 14 folded, or a roller 14 and 14 may have different numbers of folds, and in this case, the greater the number of folds, the greater the substantial thickness of the fold 1a. Since the gap is adjusted separately at one end and the other end of each roller 14, 14 reflecting the substantial thickness of the signature 1a, the gap according to the thickness at each end of the signature 1a. It is possible to realize a gap state that is not simply completely parallel, but appropriately non-parallel (however, non-parallel is slight and remains substantially parallel). While applying the pressure necessary to make a crease, the fold 1a is moved between the rollers 14 and 14. It can be passed through the slip.

(Other)
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.
For example, in the above-described embodiment, a chopper roller that presses a chopper folded crease and processes the crease as a crease processing roller will be described. However, the present invention adds a fold folded laterally by a folding blade of a folding cylinder. The present invention can be widely applied to other crease processing rollers such as a downward drag roller for processing a pressure crease.
The clearance adjustment mechanism is not limited to the configuration of the above embodiment as long as it has a function of adjusting the clearance between the crease processing rollers. 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. Application of an electric or fluid pressure driven linear motor or the like is also conceivable.

In the above embodiment, the controller 24 automatically performs all processes related to the gap adjustment, including the determination of whether or not to perform the gap adjustment and the setting of the initial distance between the rollers 14 and 14 during the gap adjustment. However, some of these processes, such as determination of whether or not to perform gap adjustment and setting of an initial distance, may be performed manually by an operator.
Furthermore, in the above-described embodiment, the distance between the rollers 14 and 14 is measured through a plurality of copies of the signature 1a. However, a proper number of signatures such as the distance is measured for only one signature of the signature 1a. The distance can be measured for 1a.

  In the above embodiment, after the step of measuring the size of the gap (measurement step), the printing press 2 is stopped at one end. You may implement clearance adjustment. In this case, the generation of waste paper is slightly increased, but the processing time for adjusting the gap can be shortened by this amount because there is no need to stop the printing machine 2 and then restart it.

In addition, if the signature is limited to the one in which the gap does not need to be appropriately non-parallel and is simply required to be completely parallel, a sensor is provided only at one end of the rollers 14 and 14, and this sensor value Or based on the average value of the sensor values at both ends, the same target value may be set for each end of the rollers 14 and 14, and each end may be controlled to be in the same state.
In the present embodiment, the target value (gap) is obtained by multiplying the measured value of the gap (average value dav of the distance between the rollers 14 and 14) by a coefficient k slightly smaller than 1 or subtracting the minute value s. Dt), the correction coefficient k and the correction amount s for the measured value of such a gap are set to one of the above-mentioned various printing conditions, and the main printing (normal operation of the printing press). It is also possible to set a value according to the printing speed at the time or a combination thereof, and thereby setting the target value (the optimum value of the gap) to a value according to the printing conditions and the printing speed at the time of actual printing. Can do.

It is a block diagram which shows the clearance gap adjustment apparatus of the crease process roller of the printing press concerning one Embodiment of this invention. It is a flowchart which shows the clearance gap adjustment method of the crease processing roller of the printing press concerning one Embodiment of this invention. It is a perspective view explaining the conventional chopper apparatus and a chopper roller. It is a block diagram which shows the clearance gap adjustment apparatus of the crease processing roller of the printing machine concerning a prior art example.

Explanation of symbols

1, 1a signature 11 transport belt 12 chopper table 12a slit 13 chopper blade 14, 14A, 14B chopper roller (folding roller)
15, 15A, 15B Support arm 15a One end (upper end) of the support arm 15
15b The other end (lower end) of the support arm 15
16 Support shaft 17 Gap adjustment mechanism 18 Spring 19, 19A, 19B Movable stopper member 19A First stopper member 19B Second stopper member 20 Screw shaft 21 Handle 22 Motor (actuator)
23 Sensor 24 Controller

Claims (12)

A gap adjusting mechanism for adjusting a gap between the pair of crease processing rollers with respect to a pair of crease processing rollers that are mounted on a printing press and pressurize a crease into a crease formed by cutting printed printing paper. When,
An actuator for driving the gap adjusting mechanism;
A sensor for measuring the gap between the pair of crease rollers;
A controller for controlling the operation of the printing press, and controlling the operation of the actuator so that the gap becomes an optimum value based on the measurement result of the sensor;
When the printing condition is changed, the controller controls the operation of the actuator so that the gap becomes an initial distance according to the printing condition before the normal operation of the printing machine. Based on the measured value of the gap obtained from the sensor when the signature passes between the pair of crease processing rollers, the gap is set to an optimum value. A gap adjusting device for a crease processing roller of a printing machine, wherein the operation of the actuator is controlled to be an optimum value. 2. The gap adjusting device for a crease processing roller of a printing press according to claim 1, wherein the crease processing roller is a chopper roller that presses a chopper folded crease to process the crease. 2. The fold processing roller of a printing press according to claim 1, wherein the fold processing roller is a folding drag roller that presses a fold folded by a folding blade of a folding cylinder to process the fold. Gap adjustment device. The controller performs a slow operation of the printing machine and measures the gap when the signature passes between the pair of crease processing rollers with respect to a plurality of preset signatures. The crease processing roller for a printing press according to any one of claims 1 to 3, wherein an optimum value of the gap is set based on an average value of a plurality of measurement values obtained thereby. Gap adjustment device. 5. The printing according to claim 1, wherein the controller sets a value obtained by reducing the measured value by a minute amount based on the measured value as an optimum value of the gap. Clearance adjustment device for crease processing roller of machine. The gap adjustment mechanism is
An urging member that applies an urging force to the pair of crease processing rollers in a direction that restricts expansion of the gap;
A movable stopper member that abuts against the support member of the pair of crease processing rollers in a direction that opposes the biasing member and regulates the reduction of the gap;
A position adjusting member for adjusting the position of the movable stopper member;
The gap adjustment device for a crease processing roller of a printing press according to any one of claims 1 to 5, wherein the actuator drives the position adjustment member. The movable stopper member includes a first stopper member that contacts a support member of one of the pair of crease processing rollers and a second stopper member that contacts a support member of the other roller, and the first stopper The member and the second stopper member are machined with female screws in opposite directions,
The position adjusting member is a screw shaft on which a male screw to be screwed with each female screw of the first stopper member and the second stopper member is processed.
The first stopper member and the second stopper member are restricted in rotation so that the first stopper member and the second stopper member approach or separate as the screw shaft rotates. The gap adjusting device for a crease processing roller of a printing machine according to claim 6. The gap adjusting mechanism, the actuator, and the sensor are provided on one end side and the other end side of the pair of crease processing rollers, respectively, and the controller is configured based on the measured values from the sensors. The gap adjusting device for a crease processing roller of a printing press according to any one of claims 1 to 7, characterized in that the operation of each of the actuators is controlled. The printing conditions include any of the type of the printing paper, the number of folded pages entering the pair of crease rollers or the folded state, the ink transfer state of the printing, and the printing atmosphere. The gap adjusting device for a crease processing roller of a printing press according to any one of claims 1 to 8, wherein A gap adjusting mechanism for adjusting a gap between the pair of crease processing rollers with respect to a pair of crease processing rollers that are mounted on a printing press and pressurize a crease into a crease formed by cutting printed printing paper. And an actuator that drives the gap adjustment mechanism, and when the printing conditions are changed, before the normal operation of the printing press, the actuator is operated to adjust the gap to an optimum value. A clearance adjustment method for a crease processing roller of a machine,
A preparation step of operating the actuator so that the gap is an initial distance according to the printing conditions;
Thereafter, the measurement step of measuring the size of the gap when the fold passes between the pair of crease processing rollers by operating the printing machine slowly.
Thereafter, an optimum value setting step for setting the optimum value of the gap based on the measurement value obtained by the measurement step;
And a gap adjusting step for operating the actuator so that the gap becomes the optimum value set by the optimum value setting step. Adjustment method. When the printing condition is changed by using the gap adjusting device for a crease processing roller of the printing press according to any one of claims 1 to 9, before the normal operation of the printing press by the controller, A method for adjusting a gap of a crease processing roller of a printing machine, wherein the actuator is operated so that the gap is adjusted to an optimum value.
A preparation step of operating the actuator so that the gap is an initial distance according to the printing conditions;
Thereafter, the measurement step of measuring the size of the gap when the fold passes between the pair of crease processing rollers by operating the printing machine slowly.
Thereafter, an optimum value setting step for setting the optimum value of the gap based on the measurement value obtained by the measurement step;
And a gap adjusting step for operating the actuator so that the gap becomes the optimum value set by the optimum value setting step. Adjustment method. The method for adjusting a gap of a crease processing roller of a printing machine according to claim 10 or 11, wherein the printing machine is stopped once after the measuring step.

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