JP5569420B2 - Paper splicing method for newspaper printing press - Google Patents

Description

  The present invention relates to a paper splicing method for a newspaper printing press.

2. Description of the Related Art Newspaper printing rotary presses use a rotary press that continuously prints newspapers or the like by supplying paper from a web when printing newspapers.
In the rotary press, when the winding paper being fed becomes a small diameter and the remaining paper is low, the winding paper is replaced. Here, in order to prevent a decrease in printing efficiency, it is necessary to replace the web without stopping the rotary press. Therefore, the rotary press includes a paper splicing device that can automatically replace the web while continuing to feed paper (see, for example, Patent Documents 1 to 4). The web splicing device of a rotary press has been disclosed with improved paper splicing accuracy and ease of work. However, with high-speed printing, the amount of used paper is increasing. None have been disclosed, and there are still defective products due to wrinkles.

  FIG. 7 is a process diagram of a web splicing method for a rotary press according to the prior art. As shown in FIG. 7A, the web splicing device 20 of the rotary press places the first web 21 being fed and the second web 22 before being fed on a circumference around the rotation shaft 35. A rack 30 is provided. Further, a fixed roller 28 is provided on which the first paper 11 supplied from the first web 21 is stretched. Furthermore, the first paper 11 is pressed against the second web 22 and adhered, and a paster arm 40 for cutting the first paper 11 is provided. The paster arm 40 is provided with a presser roller 44, a brush 46 and a cutter 48. The presser roller 44 abuts on the first paper 11 in the free running area 25 of the first paper 11 between the first web 21 and the fixed roller 28, and functions as a presser member for the first paper 11.

The web splicing device 20 of the rotary press converts the first paper of the first web 21 from the first paper of the first web 21 to the second paper of the second web 22 when the diameter of the first web being fed decreases to the first predetermined diameter. Start the splicing operation.
First, as shown in FIG. 7B, by rotating the rack 30, the first web 21 is separated from the fixed roller 28, and the second web 22 is brought closer to the paper splicing position. Next, as shown in FIG. 7C, the paster arm 40 is lowered and the presser roller 44 is brought into contact with the first paper 11 in the free running area 25.

  Then, when the diameter of the web being fed further decreases to the second predetermined diameter, the paper splicing is executed. Specifically, the first paper 11 and the second paper are adhered by extruding the first paper 11 with the brush 46. Further, the first paper 11 is cut by the cutter 48 on the upstream side of the bonding portion while the first paper 11 is pressed by the pressing roller 44 and the brush. Thus, the second paper is added to the first paper 11, and thereafter, the second paper is supplied from the second web 22 and the paper splicing operation is completed.

JP-A-8-231091 JP 2003-72994 A JP 2004-155564 A Japanese Patent Publication No.49-17202

  As shown in FIG. 7A, a space between the first web 21 and the fixed roller 28 is a free running area 25 in which the first paper 11 runs free (without being restricted by a roller or the like). The free running area becomes longer due to the decrease in the first web, and in the state before the paper splicing operation shown in FIG. 7A, the length of the first paper 11 in the free running area 25 is a. In the state after the rack rotation shown in FIG. 7B, the first web 11 is separated from the fixed roller 28 by the rotation of the rack 30, so that the length of the first paper 11 in the free running area 25 is c. It is growing.

  FIG. 8 is an explanatory diagram of paper curl and wrinkles. When the length of the free running area 25 of the first paper 11 is increased, the curl 3 is generated at the end in the width direction of the first paper 11. Sag is a phenomenon in which the first paper 11 flutters in the normal direction of the paper surface. Since the tension of the first paper 11 rises at the portion where the curl 3 is generated, uneven tension occurs in the width direction of the first paper 11. As a result, a portion 4 folded on the first paper 11 is generated. When this portion 4 passes through the infeed roller 16 shown in FIG. 1, there is a problem that the first paper 11 is wrinkled.

  In general, the size of the web is expressed by “continuous” (one continuous is the length of paper on which 1000 newspapers having a standard dimension can be printed). As the size of the web is larger, the frequency of replacing the web can be reduced. Therefore, in recent rotary presses, a large size of 70 continuous webs is used, and the printing speed is also increased. Increasing the size of the web makes the free running area longer and the first paper 11 is more likely to curl. Further, the weight of the newsprint has been reduced and the basis weight has been reduced, resulting in a reduction in paper thickness. In addition to the decrease in rigidity due to recycling, the frequency of occurrence of curling is becoming extremely high due to the increase in the mixing ratio of waste paper through the promotion of recycling, and the decrease in rigidity due to the increase in ash content and the increase in fine fibers. It is.

  Accordingly, an object of the present invention is to provide a paper splicing method for a newspaper printing press that does not require a special device and can prevent generation of wrinkles due to paper curling.

In order to solve the above-mentioned problems, a paper splicing method for a newspaper printing press according to the present invention comprises 70 newspaper windings of newspaper printing paper containing 50% or more of waste paper on a circumference centered on a rotation axis. A rack that holds the take-up newspaper being fed at a paper feed position, a fixed roller on which paper supplied from the newspaper take-up is fed during feeding,
In the free running area of the paper between the newspaper winder and the fixed roller during paper feeding, the pressing member capable of contacting the paper, and the remaining amount of the paper web being fed is less than a predetermined amount A web splicing method for a rotary press provided with a winding remaining amount detecting means for detecting that the paper is being fed by the winding remaining amount detecting means during high-speed printing at a printing speed of 150,000 copies / hour or more. The rack is rotated while the first web is placed at the paper feed position in a state before detecting the remaining amount of the first web and adding the second web of the second web. Without holding the first paper in the free running area of 1350 mm to 1670 mm, the holding member is held in the free running area of the first paper at an angle of 30 ° to 70 °, and the pushing amount is 250 mm to 500 mm. Paper to be in contact with A pressing step and a rack for rotating the rack to separate the first web from the fixed roller and to bring the second web closer to the splicing position and to bond the second paper to the first paper Paper splicing of a newspaper printing press that sequentially performs a rotation / adhesion step, a cutting step for cutting the first paper, and a return step for rotating the pressing member to move the second web to the paper feeding position. Method.

According to the present invention, after the free running area of the first paper between the first web and the fixed roller before the paper splicing operation is brought into contact with the first paper in the paper pressing step, the first paper It is divided into a first free running area on the web side and a second free running area on the fixed roller side. When the rack is rotated in the next rack rotation / adhesion process, the length of the first free running area increases, but the length of the first free running area and the length of the second free running area are still set as the splice. It can be suppressed to the length of the free running area before work. Accordingly, the length of the free running area of the first paper in all processes during the paper splicing operation is equal to or less than the length of the free running area before the paper splicing work.
In particular, in a rotary press that uses 70 series of webs, the first paper in the free running area has a length of 1670 mm and is curled. Therefore, the present invention is configured such that the paper pressing step is performed in a state where the length of the first paper in the free running area is less than 1670 mm. As a result, the length of the free running area of the first paper in all processes during the paper splicing operation is less than 1670 mm. Therefore, it is possible to prevent the first paper from being curled and to prevent the generation of wrinkles due to the curling. Further, when the pressing member is brought into contact with the first paper at a time of less than 1350 mm, the generation of wrinkles is surely suppressed, but the generation of paper dust and the pressing member itself and the brush attached thereto are worn, and the surface of the newsprint paper It is not preferable because it affects

  In the paper pressing step, it is preferable that the first paper in the free running area is pressed by the pressing member so that the pressing amount of the first paper by the pressing member is not less than 250 mm and not more than 500 mm. If the push-in amount is less than 250 mm, it cannot be sufficiently suppressed and wrinkles may occur. The larger the amount of pushing, the more effective, but it is not preferable to push over 500 mm because some devices require a change of the arm type rack that holds the web.

  In the paper pressing step, it is preferable that the first paper in the free running area is pressed by the pressing member so that a holding angle of the first paper by the pressing member is not less than 30 ° and not more than 70 °. When printing is performed at a high speed of 150,000 copies / hour, it is not preferable to deviate from this range because the paper curling may not be reliably suppressed, and it may be excessively pressed to cause paper breakage.

In the paper pressing step, it is preferable that the pressing member is brought into contact with the first paper in the free running region in a state where the diameter of the first web is 300 mm or more and less than 400 mm.
Generally, as the remaining diameter of the first web becomes smaller, the length of the first paper in the free running area becomes longer. Even when the free running area is within the above range, if the diameter of the first web is less than 300 mm, the first paper is more reliably prevented from curling in the high-speed printing state of 150,000 copies or more / hour, and wrinkles based on the curling Even if it is possible to prevent the occurrence of this, it is not preferable because the pasting and the cutter operation may not be in time and the paster may fail.

The paper splicing method for a newspaper printing press according to the present invention is effective for splicing newspaper webs with a waste paper content of 50% or more.
If the ratio of used paper increases, fine fibers increase and the paper thickness decreases, so that the rigidity of the paper decreases, and paper dust is likely to be generated due to the influence of fine fibers.
Wrinkles are affected by the lateral stiffness of paper. If the paper splicing method of the present invention is used, wrinkles can be prevented from occurring even when the waste paper content is 50% or more. This is particularly effective for a web having a lateral stiffness (pure bending stiffness) of 15 mNm / 1000 or more and 30 mNm / 1000 or less. A lateral rigidity of less than 15 is not preferable because it affects printability other than wrinkles.

On the other hand, a paper splicing device for a newspaper printing press according to the present invention holds 70 series of newspaper windings of newspaper printing paper containing 50% or more of a plurality of used papers on a circumference around a rotation axis, A rack that arranges the paper take-up being fed at a paper feed position;
A fixed roller on which the paper supplied from the newspaper winder is stretched during paper feeding;
In the free running area of the paper between the newspaper winder and the fixed roller during paper feeding, the pressing member capable of contacting the paper, and the remaining amount of the paper web being fed is less than a predetermined amount A web splicing method for a rotary press provided with a winding remaining amount detecting means for detecting the occurrence of the occurrence of printing, and during the high speed printing at a printing speed of 50,000 copies / hour or more, The rack is rotated while the first web is placed at the paper feed position in a state before detecting the remaining amount of the first web and adding the second web of the second web. Without holding the first paper in the free running area of 1350 mm to 1670 mm, the holding member is held in the free running area of the first paper at an angle of 30 ° to 70 °, and the pushing amount is 250 mm to 500 mm. Paper press And a rack for rotating the rack to separate the first web from the fixed roller and to bring the second web closer to the splicing position and to bond the second paper to the first paper. Paper splicing of a newspaper printing press that sequentially performs a rotation / adhesion step, a cutting step for cutting the first paper, and a return step for rotating the pressing member to move the second web to the paper feeding position. Device.

  According to the present invention, the free running area of the first web is in the range of 1350 mm to 1670 mm without holding a further device, and the holding member is held in the free running area of the first web in the range of 30 ° to 70 °. By rotating the rack after abutment so that the pushing amount is not less than 250 mm and not more than 500 mm, it is possible to prevent the winding of the first winding without causing paper breakage and to suppress the generation of wrinkles due to the turning. It became.

It is a schematic block diagram of a rotary press. 1 is a schematic configuration diagram of a paper splicing device for a rotary press according to an embodiment. It is front sectional drawing of the shaft edge part periphery of a 1st web. It is process drawing of the paper splicing method of the rotary press which concerns on embodiment. It is process drawing of the paper splicing method of the rotary press which concerns on embodiment. It is an enlarged view of a press roller periphery. It is process drawing of the paper splicing method of the rotary press based on a prior art. It is explanatory drawing of paper curl and wrinkles.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Rotary press)
FIG. 1 is a schematic configuration diagram of a rotary press. The rotary press 1 mainly includes a paper supply unit 10 that supplies the paper 11, a printing unit 80 that performs printing on the paper 11, and a folding unit 90 that folds the printed paper. The rotary press of this embodiment performs high-speed printing of 150,000 copies or more per hour. A pulse gear 82 is attached to the rotary machine spindle of the printing unit 80, and the rotation pulse of the rotary machine spindle is counted by the magnetic sensor 81.

  The paper feeding unit 10 includes a feeding unit (20) for feeding the paper from the web, a tension detection unit 18 for detecting the paper tension, and an infeed unit 16 for feeding the paper to the printing unit 80 with uniform paper tension and speed. I have. In the feeding portion (20), 70 webs 21 and 22 are used. The feeding unit (20) automatically adds the second paper of the second winding paper 22 before feeding to the first paper 11 of the first winding paper 21 being fed while continuing feeding. It functions as a paper splicing device 20 for exchanging.

(Paper splicer)
FIG. 2 is an explanatory diagram of a paper splicing device for a rotary press. The web splicing device 20 of the rotary press mainly includes a rack 30 that holds a plurality of 70 webs 21, 22 and 23 on the same circumference around a rotation shaft 35, and a first web 21 that is being fed. The paster arm 40 that bonds the second paper and the first paper 11 of the second web 22 before feeding and cuts the first paper 11. And.

  The rack 30 includes a rotation shaft 35 that is rotated by a rotation driving means 34 such as a motor. A plurality of arms 31, 32, 33 extend radially from the rotation shaft 35. In this embodiment, a three-arm (three-forked) rack 30 is used, but a two-arm rack may be used. The arms 31, 32, and 33 are provided at both ends of the rotation shaft 35, and shafts 36, 37, and 38 are provided so as to span the ends of a pair of arms that have the same phase. The shafts 36, 37, and 38 are rotatably supported with respect to the arms 31, 32, and 33. The sensor 61 mounted on the arm 31 reads the mark 62 mounted on the shaft 36 so that the rotational position of the shaft 36 can be detected.

  On each of the shafts 36, 37, and 38, winding papers 21, 22, and 23 on which printing paper is wound are mounted. By rotating the rotation shaft 35 of the rack 30, the first web 21 is disposed at the paper feed position S (see FIG. 4A) where the web being fed is placed, and paper feeding for paper splicing is performed. The second web 22 is placed at the paper splicing position R where the previous web is placed. Note that when the photoelectric sensor 54 detects the second web 22, the rotation of the rack 30 is stopped, so that the second web 22 can be accurately placed at the paper splicing position R.

  The webs 21, 22, and 23 can be rotated together with the shafts 36, 37, and 38. When the shaft 37 is rotationally driven by a rotational driving means 39 such as a motor, the second web 22 at the joint position R is rotated. When the sensor 64 reads a mark attached to a predetermined position of the second web 22, it can be detected that the end of the second paper of the second web 22 is at a predetermined rotational position.

  FIG. 3 is an explanatory view of the web paper brake device, and is a front cross-sectional view around the shaft end portion of the first paper web. A brake device 50 is provided to adjust the tension of the running paper. In this embodiment, a brake device 50 of the center brake system is employed to cope with high-speed printing of 150,000 copies or more per hour. The brake device 50 is provided at the tip of the arm 31 that supports the shaft 36. The brake device 50 includes a disk 51 fixed to an end portion of the shaft 36, pads 52 disposed on both surfaces of the disk 51, and an air cylinder 53 that presses the pad 52 against the disk 51. Then, by adjusting the pressing force of the pad 52 against the disk 51, the rotational speed of the first web 21 can be adjusted, and the tension of the first paper fed from the first web 21 can be adjusted.

  Returning to FIG. 2, the fixed roller 28 can freely rotate around a fixed central axis, and is disposed adjacent to the rack 30. Note that a space between the first web 21 being fed and the fixed roller 28 is a free running area 25 of the first paper 11 spanned between them.

  The paster arm 40 is disposed on the opposite side of the rack 30 with the free running area 25 interposed therebetween. The paster arm 40 rotates around the central axis of the fixed roller 28 by the expansion and contraction operation of the actuator 41. A presser roller 44 is provided in front of the lower end portion of the paster arm 40 (in the direction of the free running area 25). The presser roller 44 freely rotates around a central axis fixed to the paster arm 40. When the actuator 41 is driven and the paster arm 40 is lowered, the presser roller 44 comes into contact with the first paper 11 in the free running area 25 and pushes the first paper 11 toward the rack 30 side. If the downward movement of the paster arm is stopped when the photoelectric sensor 55 detects the first paper 11, the first paper 11 can be accurately pushed by a predetermined amount. Note that a non-rotating presser bar may be adopted as the presser member instead of the rotatable presser roller 44.

  A brush 46 is provided in front of the paster arm 40 between the fixed roller 28 and the presser roller 44 to press and bond the first paper 11 to the second paper of the second web 22. The brush 46 can move toward and away from the first paper 11 by a moving means (not shown). In place of the brush 46, a brush roller may be employed. A cutter 48 for cutting the first paper 11 is provided in front of the paster arm 40 between the brush 46 and the pressing roller 44. The cutter 48 can move toward and away from the first paper 11 by a moving means (not shown).

(Paper splicing method)
A paper splicing method using the paper splicing device of the rotary press described above will be described.
4 and 5 are process diagrams of a paper splicing method for a rotary press according to the present embodiment. However, FIG. 4A shows a normal printing state. In the present application, the normal printing state means that after the previous paper splicing operation is completed and feeding from a new web placed at the paper feed position is started, the remaining diameter of the web becomes the first predetermined diameter and the next A state in which printing is performed on the fed paper until the splicing operation is started. 4 and 5, the components of the paper splicing device are omitted as appropriate for easy understanding of the drawings.

  In the normal printing state, the remaining diameter (remaining amount) of the first web being fed is monitored. Specifically, while the sensor 61 shown in FIG. 2 continuously reads the mark 62 (that is, while the shaft 36 rotates once), the magnetic sensor 81 shown in FIG. 1 counts the number of rotation pulses of the pulse gear 82 of the rotary press. Count. As the remaining diameter of the first web 21 decreases, the number of rotation pulses of the rotary press during one rotation of the first web 21 decreases. Therefore, when the number of rotation pulses of the rotary press is reduced to a predetermined number, it is detected that the remaining diameter B of the first web 21 shown in FIG. 4A has decreased to the first predetermined diameter (predetermined amount). Can do. That is, the sensor 61 and the mark 62 shown in FIG. 2, and the magnetic sensor 81 and the pulse gear 82 shown in FIG. 1 function as a web remaining amount detecting means. When it is detected that the remaining diameter B of the first web 21 shown in FIG. 4A has decreased to the first predetermined diameter, the second paper of the second web 22 before feeding is changed to the first paper 11. In order to add, a paper splicing operation described in detail below is started. The first predetermined diameter and the length of the free running area at this time will be described later.

  (Paper Pressing Step) First, as shown in FIG. 4B, the paster arm 40 is lowered without rotating the rack 30 with the first web 21 placed at the paper feeding position S. As a result, the presser roller 44 of the paster arm 40 is brought into contact with the first paper 11 in the free running area 25 and the first paper 11 is pushed into the rack 30 side. The pushing amount and the holding angle will be described later. If the lowering of the paster arm 40 is stopped when the photoelectric sensor 55 shown in FIG. 2 detects the first paper 11, the first paper 11 can be accurately pushed by a predetermined amount.

FIG. 6 shows an enlarged view around the pressing roller. In the paper pressing step, the more the pressing roller 44 is pressed against the first paper 11 in the free running area 25, the more reliably the curling of the first paper 11 can be suppressed. The harder the pressing roller 44 is pressed, the deeper the first paper 11 in the free running area 25 is pushed into the rack 30 side. Therefore, in the present invention, the paper pressing process is performed so that the pressing amount H of the first paper 11 by the pressing roller 44 is 250 mm or more. When the pushing amount H exceeds 500, the first paper may come into contact with the rack 30 depending on the apparatus.
Therefore, the paper pressing step is performed so that the pressing amount H becomes 250 mm or more and 500 mm or less.

Further, the pressure roller 44 is more deeply held by the first paper 11 as the pressure roller 44 is strongly pressed against the first paper in the free running area. Therefore, in the present invention, the paper pressing step is performed so that the holding angle of the pressing roller 44 by the first paper 11 (the contact angle of the first paper on the outer periphery of the pressing roller 44) θ is 30 ° or more. When the holding angle θ exceeds 70 °, the first paper 11 may come into contact with the rack 30 depending on the paper break or the apparatus. Therefore, the paper pressing step is performed so that the holding angle θ is 30 ° or more and 70 ° or less.

In the paper splicing method for a newspaper printing press according to the present invention, the first rotor in the free running area has a length of 1670 mm or less, and the presser rotor is brought into contact with the free running area in all steps during the paper splicing process. The free running area of the first paper is 1670 mm or less. Therefore, it is possible to prevent the first paper from being curled and to prevent the generation of wrinkles due to the curling.

(Rack Rotation Step) Next, as shown in FIG. 4C, the rack 30 is rotated around the rotation shaft 35. As a result, the first web 21 is separated from the fixed roller 28 and the second web 22 is disposed at the paper splicing position R. If the rotation of the rack 30 is stopped when the photoelectric sensor 54 shown in FIG. 2 detects the second web 22, the second web 22 can be accurately placed at the paper splicing position R.
Further, the rotation driving means 39 shown in FIG. 2 is driven to rotate the second web 22 until the traveling speed of the outer peripheral surface of the second web 22 is the same as the traveling speed of the first paper 11.

  (Adhesion process) Similar to the normal printing state, the remaining diameter of the first web 21 being fed is monitored after the start of the paper splicing operation. Then, when it is determined that the remaining diameter of the first web 21 has decreased to the second predetermined diameter (<first predetermined diameter), the bonding step of bonding the second paper of the second web 22 to the running first paper 11 To start. Specifically, the sensor 64 shown in FIG. 2 reads the mark 65 attached to the predetermined position of the second web 22 to detect that the end of the second paper of the second web 22 is at the predetermined rotation position. To do. Note that one side of the double-sided tape is previously attached to the end of the second paper. Here, as shown in FIG. 5A, the brush 46 of the paster arm 40 is brought close to the first paper 11, the first paper 11 is pressed against the end of the second paper, and the other side of the double-sided tape is attached to the first paper 11. Affix to one sheet 11. As a result, the second paper is bonded to the first paper 11. Instead of pressing the first paper 11 against the end of the second paper with the brush 46, the rack 30 may be rotated to press the end of the second paper against the first paper 11.

(Cutting Step) Next, as shown in FIG. 5A, the cutter 48 is moved closer to the first paper 11 while pressing the first paper with the pressing roller 44 and the brush 46 of the paster arm 40. Then, the first paper 11 is cut by the cutter 48 on the upstream side of the bonding portion with the second paper.
(Retraction Step) Next, as shown in FIG. 5B, the paster arm 40 is raised and the paster arm 40 including the presser roller 44 is retracted from the free running area 25.
(Returning Step) Next, as shown in FIG. 5C, the rack 30 is rotated to move the second web 22 to the paper feeding position S. As a result, the paper splicing device (paper feeding unit) 20 returns to the normal printing state shown in FIG. Normal printing is performed in a state in which the web 30 is fixed at the paper feed position S without rotating the rack 30. The used first web 21 that has been moved to the standby position is replaced with a new web.
Thus, the web splicing operation of the rotary press is completed.

  By the way, in the paper splicing method of the rotary press according to the prior art, the rack rotation shown in FIG. 7B is first performed from the normal printing state before the paper splicing operation shown in FIG. The paper presser shown in c) is performed. In this case, in the state before the paper splicing operation shown in FIG. 8A, the length of the first paper 11 in the free running area is a, whereas after the rack rotation shown in FIG. In the state, the length of the free running area extends to c.

  FIG. 8 is an explanatory diagram of paper curl and wrinkles. When the length of the free running area of the first paper 11 is increased, the curl 3 is generated at the end of the first paper 11. Sag is a phenomenon in which the first paper 11 flutters in the normal direction of the paper surface. Since the tension of the first paper 11 rises at the portion where the curl 3 is generated, uneven tension occurs in the width direction of the first paper 11. As a result, a portion 4 folded on the first paper 11 is generated. When this portion 4 passes through the infeed roller 16 shown in FIG. 1, there is a problem that the first paper 11 is wrinkled.

Particularly, in a rotary press that uses a large size of 70 continuous webs, the length of the free-running region is long, and the first paper 11 is likely to curl. Further, in a rotary press that performs high-speed printing of 150,000 copies or more per hour, the traveling speed of the first paper 11 is increased, so that the first paper 11 is likely to curl. In addition, when the basis weight (weight per unit area) of the paper is as low as 38 g / m ² or more and 45 g / m ² or less, the stiffness of the paper is lowered, so that the first paper 11 is easily bent. In addition, when the amount of used paper is as large as 50% or more, the amount of fine fibers increases and the thickness of the paper decreases, the stiffness of the paper decreases, and the net bending stiffness of the web that affects the twist is increased. Since it becomes easy to generate | occur | produce the 1st paper 11 especially when it becomes 30 mNm / 1000 or less, it is preferable to apply this invention.

Examples of the present invention will be described below.
For a rotary press X manufactured by P Company, 70 series of rolled paper A having a wastepaper content of 50%, a basis weight of 45 g / m ² and a pure bending stiffness of 25.4 mNm / 1000, and a wastepaper content of 100%, a basis weight of 38 g / m ² Table 1 shows the results of paper splicing under each condition using 70 series of rolled paper B having a pure bending stiffness of 16.1 mNm / 1000.
For the free running area where the pressing member is in contact, calculate the free running area based on the trigonometric function from the figure of the old winding diameter value and guide roll arrangement, obtain the old winding diameter value, This is reflected in the winding diameter setting.

(Basis weight)
It measured based on the method as described in JISP8124 "basis weight measuring method".
(Pure bending stiffness)
After adjusting the humidity at 23 ° C. and 50% RH, the test piece cut to a width of 50 mm (in the direction perpendicular to the coating direction) was subjected to a pure bending stiffness tester (trade name KES-FB2-A, Kato Tech ( The product was bent and deformed at a deformation rate of 0.5 cm / sec. The curvature and torque at that time were measured, the amount of bending moment change per unit curvature change (per unit specimen width) was determined, and this was defined as the pure bending stiffness.

A: Length of the first paper in the free running area B: Remaining diameter H of the first web: Push-in amount S: Paper feed position R: Paper splice position 1: Rotary press θ: Holding angle 11: First paper 12: First Sheet 2 20: Paper splicing device 21: First roll (winding paper)
22: Second roll (winding paper)
25: Free running area 28: Fixed roller 30: Rack 35: Rotating shaft 44: Pressing roller (pressing member)
61: Sensor (winding paper remaining amount detecting means)
62: Mark (winding paper remaining amount detecting means)
81: Magnetic sensor (winding paper remaining amount detecting means)
82: Pulse gear (winding paper remaining amount detecting means)

Claims (2)

A rack for holding a plurality of newspaper windings of 70 series of newspaper printing paper containing 50% or more of used paper on a circumference around a rotation axis, and arranging the newspaper winding being fed at a paper feeding position When,
A fixed roller on which the paper supplied from the newspaper winder is stretched during paper feeding;
In the free running area of the paper between the newspaper winding and the fixed roller during paper feeding, a pressing member capable of contacting the paper and the remaining amount of the newspaper winding during paper feeding is less than a predetermined amount since it a splicing method of a rotary machine having a winding Tozan amount detecting means for detecting the, during high-speed printing or printing speed of 15 million parts / hour, by the winding Tozan amount detecting means, the sheet and detecting the remaining amount of the first winding of the paper, in a state before entering the work annex the second sheet of the second winding to the first sheet of the first winding, the first winding The holding member is held in the free running area of the first paper at an angle of 30 ° in a state where the free running area of the first paper is 1350 mm to 1670 mm without rotating the rack while being arranged at the paper feeding position. It is made to contact so that the amount of pushing becomes 250 mm or more and 500 mm or less at 70 degrees or less. A paper pressing step, and then a rack is rotated to separate the first winding from the fixed roller, the second winding is brought close to a paper splicing position, and the second paper is moved to the first paper. A rack turning / bonding step for bonding to the paper, a cutting step for cutting the first paper, and a return step for turning the pressing member to move the second winding to the paper feeding position. A newspaper splicing method for a newspaper printing press. ^2. The newspaper printing ring according to claim 1, wherein the newspaper printing paper has a basis weight of 38 g / m ² to 45 g / m ² and a transverse pure bending stiffness of 15 mNm / 1000 or more and 30 mNm / 1000 or less. A paper splicing method for a turning point.

Images