RU2199482C2 - Method of edge cutting of printer's sheets in sheeting machine and sheeting machine with devices for cross cutting of printer's sheet edges - Google Patents

Abstract

FIELD: paper industry, printing. SUBSTANCE: description of invention discloses sheeting machine. In process of operation of said machine cutting of sheets from all sides and dividing of sheets into parts are carried in real time. Printer's sheets in machine are cut over edges by means of cross-cutting devices. First cross-cutting device provides cutting of strip from rear edge of printer's sheet square to direction of transportation. Then printer's sheet is turned to make cut edge of printer's sheet move first. Then printer's sheet edge moving last is also cut square to direction of transportation by means of second cross-cutting device. Sheet is divided into some number of parts located close to each other by means of longitudinal cutting. Longitudinal cuts are checked by means of checking device. Sheet and/or parts of printer's sheet are transported by sheet gripping systems. Proposed method and sheeting machine provide checking both printing and register of cutting, cutting of sheets into parts and sorting out of sheet parts, by means of built in quality monitoring equipment. EFFECT: improved quality of sheet cutting and sorting out. 16 cl, 5 dwg

Description

 The invention relates to high-precision technology for processing printed sheets, and more particularly to a method for trimming the edges of printed sheets in a sheet processing machine and to a sheet processing machine with devices for transversely cutting edges of printed sheets, implementing the specified method.

 Known German patent application AS 1044589, describing a device for the transverse cutting of paper tapes. A tape system is connected to this device for transporting sheets cut from the tape.

 German patent application 4313452 A1 describes a device for cutting sheets from a tape. This device has two cross-cutting devices, through which the front end of the tape is trimmed exactly in size first, and then the sheet is separated from the tape.

 German patent application 4238387 A1 represents a device for adjusting the cutting on the transverse cutters of rotary printing machines. A rotary cutting cylinder is provided here that cooperates with a fixed fixed counter knife.

 Closest to the claimed invention is a method of cutting sheets in a sheet processing machine, disclosed in US patent 5452959 and including trimming the edges of the printed sheets using a device for transverse cutting of sheets. According to this method, first, the rear end of the sheet is cut perpendicular to the transport direction with the first transverse cutting device, while the sheet processing machine further rotates, after which the sheet is cut by the second device.

 The basis of the invention is the creation of a method of trimming the edges of printed sheets in a sheet processing machine, which allows for trimming all the edges of a printed sheet with high quality, which will allow checking the front and back sides of a sheet for both print quality and cutting register, as well as creating a sheet processing machines with devices for transversely cutting the edges of printed sheets, implementing the specified method.

 This problem is solved by the totality of the characteristics specified in paragraphs 1-16 of the claims.

 An additional advantage achieved by the present invention is, in particular, that in a sheet processing machine, it initially performs cross cutting of the beginning and end of the sheet without the use of manual labor.

 In this sheet processing machine, using the built-in control equipment, you can check both the print quality itself and the cutting register. So, for example, it is possible to simultaneously check the front and back sides of a sheet printed by face printing and printing from the back.

 By means of the interaction between the cross-cutting devices and the chain conveyor, the adjustment of the cutting register is simplified, which is carried out by an electric motor with positional regulation, which drives the cutting cylinder. A slitting device is attached to the processing cylinder of the sheet processing machine, so that the cutting of the sheets into two or more parts occurs “in real time”. These sheets can, for example, be stacked in a stack selected by the control device, in other words form sorting stacks with “good” and defective sheets. This method has the advantage that in the event of a malfunction of a part of the sheet, the entire sheet will not be ejected.

 Using this sheet processing machine, all sides of the sheet are cut, and it is cut into pieces. All completed cuts, as well as front and reverse printing, are checked by a control device and sent to stops of your choice. This sheet processing machine performs “real-time” many processing operations, which leads to higher productivity and lower manual labor. This improves the quality of products manufactured in this way.

Hereinafter, the method that is the subject of the present invention, and a sheet processing machine made according to the invention will be described in more detail below with reference to the drawings, in which
figure 1 is a schematic side view of a sheet processing machine;
figure 2 - diagram of the steps of processing sheets in a sheet processing machine;
FIG. 3 is a schematic top view of a slipway of a console of a sheet processing machine;
FIG. 4 is an enlarged schematic view of the processing cylinder of the sheet processing machine shown in figure 1, side view;
FIG. 5 is an enlarged schematic illustration of a processing cylinder of a sheet processing machine according to FIG. 1 and FIG. 5, a top view;
The sheet processing machine 1 for transverse and longitudinal cutting of sheets 2 is equipped with control devices 3, 4, 6. By sheets 2 are meant mainly paper sheets with printed images deposited on them, for example securities. The device for feeding sheets 7 has a first slipway 8, a device for separating sheets 9 and a guide table 11. To this device for feeding sheets 7 is attached a prefix 12, made, for example, in the form of a vibration attachment. The first chain conveyor 13 interacts with this vibrating attachment 12. This chain conveyor has a pair of closed chains 14 to which axial chain gripping systems 16 are attached. The chains 14 are wrapped around the first 17 and second 18 sprockets ("sprockets"). Between the first 17 and second 18 sprockets, the chains, at least partially, extend in a straight line. In the direction of transportation, indicated by arrow T, after the first sprocket, the first control device 3 is installed. The control device 3 has a fume hood 19, the working surface of which, facing the chain gripper systems, is made at least partially transparent. Under this transparent work surface are lighting devices not shown in the drawings.

 The first transverse cutting device 21 is connected to this fume hood 19.

 The transverse cutting device 21 is equipped with a rotating cutting cylinder 22 and a stationary counter knife 24 mounted on the cross member 23. The cutting cylinder 22 contains at least one recess located in the axial direction, in which a nearby chain gripper system 16. The recess width in the circumferential direction is larger than the width required by the chain grip system 16, so that in order to adjust the cutting register, the passing chain grip system 16 and the cutting cylinder 22 can be moved relative to each other in phase. In the presented example, levers rotating on both sides are provided, between which there is an axially elongated cross member for receiving the cutting knife 26.

 The cutting cylinder 22 has a phase-adjustable relative to the chain conveyor 13 drive, which in the present example is designed as an electric motor with positional regulation.

The blade 24 is mounted with a slight slope relative to the axis of rotation of the cutting cylinder 22, in other words, the blade 24 with the direction of transport T makes an alpha solution angle that is not 90 ^° , and is, for example, 89 ^° . In this example, respectively, the angle of inclination of the blade 24 to the axis of rotation of the cutting cylinder 22 is 1 ^o . In addition, the blade 24 is slightly rotated about its longitudinal axis, in other words, the blade 24 is characterized by some twist.

 The electric drive of the cutting cylinder 22 works, creating the same peripheral speed as the chain conveyor 13, so that ultimately, due to the twist and superposition of the transportation speed, a strictly perpendicular cut of the sheet 2 is obtained. The axially-mounted cutting knife 26 of the cutting cylinder 22 somewhat inclined relative to the axis of rotation of the cutting cylinder 22 and is characterized by some twist in the longitudinal direction. The cutting knife 26 of the cutting cylinder 22 and the counter knife 24 are fitted to each other.

 Instead of a fixed counter-knife 24, it is possible to use a rotating opposite cylinder, which, for example, is equipped with a counter-knife 24 to perform cutting according to the principle of scissors, or else performs a counter action. It is also possible to perform a cutting knife 26 and a counter knife 24 parallel to the axis of the cutting cylinder 22 and without twist. The cutting cylinder 22 or the opposite cylinder may also be equipped with several cutting knives.

 A second control device 4 is connected to this cross-cutting device 21 in the area of the chain conveyor 13. This second control device 4 consists mainly of a sensor 27, lighting devices 30 and a fume hood 35.

 A rotary device 28 is connected to the chain conveyor 13. In the illustrated example, the rotary device 28 consists of a storage drum 29 and a rotary drum 31.

The image drum 29 has a "doubled" circumference and is therefore equipped with two controllable gripping systems 32 spaced 180 ^° apart from each other and two exhaust systems 33 located opposite each other. The circumferential distance between the gripping systems 32 and the exhaust systems 33 can be adjusted in accordance with the length of the sheet to be transported. Exhaust systems 33 can move both along a circle and in the axial direction. The rotary drum 31 is equipped with two adjacent controlled gripping systems 34, 36, which are mounted with the possibility of tilt relative to its longitudinal axis.

 The rotary drum 31 and the image drum 29 can be adjusted in phase relative to each other.

 A cylinder 37 is connected to the rotary device 28, for example, a processing cylinder 37 with a longitudinal cutting device 38 interacting with it. This processing cylinder 37 has at least a double circumference and four independently controlled structures designed as gripping systems 39, 41, 42, 43 , retention systems 39, 41, 42, 43. These retention systems 39, 41, 42, 43 can also be implemented as vacuum grips. Two of these systems - 39, 41, or 42, 43 are located in the axial direction relative to the processing cylinder 37 approximately in the position of axial symmetry in the recess of the cylinder next to each other and can be displaced relative to each other in the axial direction. In the presented example, one of the two gripping systems 39 or 42 located adjacent to the axis is fixed in motionless (along the axis), and the second gripping system 41 or 43 can be displaced relative to the first gripping system 39 or 42 by means of the cam 40 and the roller follower 45. Movable however, there may be both gripping systems 49, 41 or 42, 43. The first pair of gripping systems 39, 41 arranged in this way is opposed by the opposing second pair of these gripping systems 42, 43.

 A longitudinal cutting device 38 with several cutting wheels 44, working in conjunction with a processing cylinder 37, is located immediately after the rotary drum 31 in the direction of sheet transport T. In this example, this longitudinal cutting device 38 is equipped with an axial cross member 46 on which three cutting wheels 44 capable of axial movement and independently driven. After the processing cylinder 37, a second chain conveyor 47 is installed with two closed chains 48. Several chains of gripping systems 49 are placed on these chains 48. These chain gripping systems 49 consist of two axial gripping systems located in the axial direction, which are located approximately symmetrically relative to the middle of the machine and are driven independently of each other. Also, the chain conveyor 47 of the capture instead of the processing cylinder 37 may have movable relative to the other axially chain systems.

 Also movable can be more than two capture systems 39, 41 or 42, 43, any number of them. In the case of three gripping systems located next to each other in the axial direction, the gripping system located in the middle can, for example, be fixed motionless in the axial direction, and both external gripping systems can be shifted relative to the central one.

Chains 48 are wrapped around the first and second sprockets 51, 52 ("sprockets"). The central assembly 53 consisting of the first sprocket wheel 51 and the processing cylinder 37 constitutes, with the central assembly 54 formed from the processing cylinder 36 and the cutting wheels 44, a beta solution angle of less than 180 ^° , for example 155 ^° .

 After this sprocket 51 in the chain conveyor 47, a hood 56 is placed under the chain 48. A second cross-cutting device 57 is attached to this hood 56, which is the same as the first cross-cutting device 21. The cross-cutting devices 21 and 57 are used to cutting ends 71, 72 of sheets 2, 82, 83. A third control device 6 with a sensor 58, lighting devices 59 and a drawer 61 is connected to this second cross-cutting device 57.

 Additionally, in the area of the chain conveyor 47, there is a cantilever 62. This cantilever 62 is equipped with six berths 63, 64 and 66 - 69, arranged two next to each other and thus forming three pairs of berths 63-64, 66-67 arranged in series with each other and 68-69. Next to each other, the stocks 63, 64 or 66, 67 of the first two pairs of stocks are each equipped with a common lifting device, so that one pair of stocks can be raised and lowered simultaneously. The third pair of berths has separate lifting devices for both adjacent berths 67-68, so that berths 67, 68 can be raised or lowered independently of each other. Under the gripping systems or chain gripping systems should be understood a certain number of grippers, which are placed on a shaft capable of tilting relative to the longitudinal axis.

 The operating procedure of the sheet processing machine 1 is as follows.

 Sheet 2, in particular a paper sheet coated with front and back printing, is sent from the first stack 8 by means of a sheet disconnecting device 9 to the receiving table 11. From this receiving table 11, the sheet 2 is picked up by the vibrating attachment 12 and fed laterally to the region of the first the sprocket wheel 17 of the first chain conveyor 13 to the chain grab system 16. This chain grab system 16 transports the sheet 2 along the “straight” part of the chain conveyor 13 to the first control device 3. By the first control device the sheet 2 is inspected sequentially in parts for damage, such as, for example, a gap and a hole. The watermarks of sheet 2 are also examined using translucency. Sheet 2 is then sent to the first control device 3 under the influence of the vacuum generated by the fume hood 19.

 The chain gripping system 16 transports the sheet 2 through the cross-cutting device 21 to the second control device 4. Here, the sheet 2 is attracted to the beginning 71 of the sheet 2 by the drawer 35 of the second control device 4. The end 72 of the sheet 2 is still in the cross-cutting device 21, where of this end 72, a narrow strip 73 located in the axial direction is cut off. In this case, the movement speed of the chain conveyor 13 and the rotation speed of the cutting knife 26 are matched to each other, so that the end 72 of the sheet 2 is cut perpendicular to the transport direction T.

 This sheet 2, having a first cut 74, is now checked by the second control device 4. In this case, the front side (face with a face seal) of sheet 2 and the new edge of sheet 2 formed from the trimmed end 72 (cutting register) are inspected.

 Further, the chain gripper system 16 transmits this sheet 2 by the beginning 71 to the memory drum gripper system. This storage drum 29 transports the sheet 2 in the direction of the rotary drum 31. Now, when the end 72 of the sheet 2 falls into the area of the exhaust systems 33 of the storage drum 29, these systems attract the trimmed end 72. The exhaust systems 33 move (approximately in the direction of the arrow) from the middle storage drum 29 and thus stretch the sheet 2 both along the envelope of the drum, and in the directions of the side edges of the sheet.

 The phase shift between the rotary drum 31 and the storage drum 29 is set to the size of the sheet 2 to be processed. The storage drum 29 transports the beginning 71 of the sheet 2 through the gap between the rotary 31 and the storage drum 29, until the exhaust systems 33 fall into this gap. The trimmed end 72 of the sheet 2 is captured by the first gripping system 34 of the rotary drum 31 and is released from the exhaust system 33 by relieving the vacuum. At the junction, both gripping systems 34, 36 of the rotary drum 31 are rotated to each other, and the trimmed end 72 is transmitted from the first gripping system 34 to the second gripping system 36. With their further movement, the gripping systems 34, 36 are deployed to their original position.

 Now, in the transport direction T, the trimmed end 72, captured by the gripping system 36, is front and the beginning 1 is rear.

 From the rotary drum 31, sheet 2 is transferred to a pair of gripper systems 39, 41 or 42, 43 of the processing cylinder 37. On the processing cylinder 37, sheet 2 in the longitudinal direction — that is, in the transport direction T — is subjected to three cuts 76, 77, 78. By means of the second and the third cuts 76, 77 from both long sides of the sheet 2, narrow strips 79, 81 are cut.

 The distribution of the gripper systems 39, 41, 42-43 of the processing cylinder 37 and the width, as well as the position of the sheet 2 are coordinated with each other so that both cut strip 79-81 do not fall into the grippers.

 The fourth section 78 divides the sheet 2 in the middle into two parts 82, 83. Here, in the area of the section, the grips are also absent.

 If all three of these longitudinal sections 76, 77, 78 are made completely, including with a maximum length of sheet 2, both parts of the sheet 82, 83 are moved apart from each other in the axial direction. In the present example, for this purpose, the gripper system 41 (43) or 39 (42) carries out axial displacement using a roller follower cooperating with the disk cam. Both of these parts of the sheet 82, 83 are transmitted in the area of the first sprocket 51 to the chain gripper system of the second chain conveyor 47 only after both parts of the sheet 82, 83 are moved apart from each other. The gripping system 41 or 43 of the processing cylinder 37 returns to its original position before receiving the next whole sheet 2.

 Spaced parts of the sheet 82, 83 are transported further in the same direction and at the same level. From this chain gripper system 49, both parts of the sheet 82-83 are guided to the second cross-cutting device 57. To fix the sheet 2, it is attracted along the entire length of the drawer 56 installed in front of the cross-cutting device 57, and the end 72 of the parts of the sheet 82, 83 located in the chain gripping system 49, it is sent to the third control device 6 by means of a fume hood 61. From the rear end of the sheet 71, now being the rear end, of the two separated parts of the sheet 82, 83, by means of the fifth cut 84 in the axial direction perpendicular to the transport direction T, the strip 86 is cut. Now the sheet is cut from all sides and divided into two parts 82, 83.

 The reverse side of sheet 2, i.e. the reverse sides of both parts of the sheet 82, 83 are checked by the control device 6 in combination with the trimmed long sides and the next last beginning 71 of sheet 2, i.e. the next last trimmed ends of the parts of the sheet 82, 83.

 Control devices 4, 6 verify the correctness of trimming (cutting register) of sheets 2, 82, 83, i.e. the position of at least one cropped edge, preferably all of the cropped edges of the sheets 2, 82, 83, relative to the markings, for example within the printed image. Preferred verification of the whole sheet, including the entire printed image.

 From the control device 6, the chain conveyor 47 transfers parts of sheets 82, 83, cut from all sides and checked from the front and back, to six slipways 63, 64, 66-69 of the console 62.

 Here, optionally, parts of the sheet 82, 83 can be laid out on one of the six slipways 63, 64, 66-69. In this case, it is preferable that the first four slipways 63, 64, 66, 67 accept the so-called “good” sheets, and the last two adjacent to each other slipways 67, 68 are rejected.

 Instead of sheets 2, 82, 83, cutting and checking can also be done with one or more control devices 3, 4, 6 of also printed ribbons, i.e. other print materials. In this case, the cutting device 1, 38, 57 can, for example, be located in the area of the folding apparatus of a rotary rotary printing machine.

 There, the tape is cut, for example, into several parts in the longitudinal direction, and then cut in the transverse direction into signatures. In this case, the correctness of the cutting register can be checked after each cut, or after the tape is completely cut into signatures. The control devices 3, 4, 6 consist, as a rule, of digital video cameras that check the entire sheet.

Claims (16)

 1. The method of trimming the edges of the printed sheets in a sheet processing machine, comprising trimming the edges of the printed sheet using transverse cutting devices of the printed sheets, characterized in that by means of the first transverse cutting device, the strip is cut from the trailing edge of the printed sheet perpendicular to the direction of transportation, after which the printed sheet turn so that the trimmed edge of the printed sheet moves first, and the front edge of the printed sheet moving now last also cut off perpendicular to the conveying direction by means of a second transverse cutting device.  2. The method according to claim 1, characterized in that the printed sheet is divided into a number of adjacent parts of the sheet using a longitudinal section.  3. The method according to claim 1, characterized in that the longitudinal sides of the printed sheet, parallel to the direction of transportation, are trimmed.  4. The method according to claim 1, characterized in that the longitudinal sections are performed between the first and second transverse sections.  5. The method according to claim 1 or 2, characterized in that the sheet after rotation is cut into parts of the sheet.  6. The method according to claim 1, characterized in that after performing the first transverse section, the sheet is checked using a control device.  7. The method according to claim 1, characterized in that after performing the second cross-section, the printed sheet is checked using a control device.  8. The method according to one of claims 1 to 3, characterized in that after all the cuts are completed, the printed sheet or parts of the sheet are checked using a control device.  9. The method according to claim 1, characterized in that before performing the first cross-sectional view, the printed sheet is checked using a control device.  10. The method according to claim 1, characterized in that the printed sheet and / or parts of the sheet are transported by capture systems.  11. A sheet processing machine with devices for transversely cutting the edges of the printed sheet, characterized in that after the first device for transversely cutting the edges of the printed sheet in the direction of transportation of the printed sheet, a device for rotating the printed sheet is installed, followed by a second device for transverse cutting in the direction of transportation of the printed sheet trimming the edges of the printed sheet.  12. The sheet processing machine according to claim 11, characterized in that a control device is installed between the first transverse cutting device and the rotation device.  13. The sheet processing machine according to claim 11, characterized in that after the second transverse cutting device, a control device is installed.  14. The sheet processing machine according to claim 11, characterized in that after the rotation device, a longitudinal cutting device is installed.  15. The sheet processing machine according to claim 11, characterized in that the cross-cutting device is installed in such a way that they interact with chain conveyors that move the sheet.  16. The sheet processing machine according to claim 12 or 13, characterized in that the control device is installed immediately after the cross-cutting device and that the control device is equipped with a fume hood for guiding the sheet.

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