SU1155470A1 - Folding and severing unit of web-fed rotary presses - Google Patents

Abstract

1. FOLDING AND CUT-OFF MACHINE OF ROLLED ROTATIONAL PRINTING MACHINES, containing mechanisms for longitudinal folding of a tape, including a ribbon-driving cylinder, contacting pinch rollers, a folding plate, guide lines and drawing pieces, and a pattern, which is attached to a clamping cylinder, contacting pinch rollers; disk scoring knife, a mechanism for transverse scoring, containing feed rollers, scoring knife and elastic surface for contact with him, placed on one of the feed rollers, mechanism for cross-folding and cutting a ribbon, comprising a folding cylinder with folding blades located on its rollers and cutting means comprising at least one movable knife and folding rollers, the drive of which is associated with the driving of the folding cylinder, characterized in that and productivity of the device, the mechanism for transverse creasing is provided with an additional scoring knife, the creasing knives are mounted on the respective rollers of the folding cylinder of the mechanism for transverse Cutting the tape is diametrically opposite to the corresponding folding knives, with the folding rollers being set eccentrically relative to their geometrical axes. 2. An apparatus according to claim 1, characterized in that the cutting means of the mechanism for transverse folding and cutting the tape have a fixed blade with a spiral cutting edge for interacting with the cutting edge of the movable blade and a knife holder with guides mounted concentrically relative to the folding cylinder, while the movable The knife has a drive of reciprocating movement and is located in the diametral plane of the folding cylinder. 3. The device on PP. 1 and 2, characterized in that the guides of the knife-holder. fixed blades have means for adjusting the radial positions, and the knife is installed in them with the possibility of fixing its positions relative to the folding cylinder circumferentially. 4. An apparatus according to claim 1, characterized in that the disk scoring knife of the mechanism for longitudinal scoring is mounted on the tape-driving cylinder of the mechanism for longitudinal folding of the tape. 5. The device on the PP. 1 and 2, characterized in that the movable knife of the cutting means of the mechanism for transverse folding and cutting of the tape has bevelled cutting edges.

Description

The invention relates to the printing industry and can be used in the folding-cutting apparatus of roll-type rotary printing machines and folding machines.

Known folding machine for rotary printing machines, containing, installed along the process, the mechanism for longitudinal folding of the tape, including a ribbon-like cylinder, contacting with him pressure rollers, folding, guides and the last pairs of rollers, a mechanism for longitudinal bending, including disk scoring knife, a mechanism for transverse creasing containing feed rollers, scoring knife and elastic surface for contact with it, placed on one of the feed rollers, fur a transverse folding and cutting belt comprising a folding cylinder with folding knives arranged on its rollers and cutting means comprising a movable knife and folding rollers, the drive of which is associated with the folding cylinder driving.

However, the mechanism for longitudinal creasing of the tape used in the known device, due to its placement on the folding machine, has disadvantages due to the fact that the transverse position of the tape relative to the beginning (top) of the folding machine is unstable due to the effect on the tape of various disturbances deviating it from the desired direction of movement (different stiffness properties of the tape along its width, due to the state of the tape itself, different effects on the tape along its width of paint, dampening solution, skewing m of tape-guide rollers and ribbon-holding cylinders, etc.), therefore the lateral position of the tape is also unstable with respect to the nozzle of the folding, and the accuracy of the longitudinal folding of the tape is violated; due to the instability of the transverse position of the tape relative to the beginning of the folding, the arrangement of the scoring device relative to the folding (between the ribbon-leading cylinder and the nose of the folding) does not ensure the stability of the movement of the tape and relative to the opening of the folding, since the lateral displacement of the tape relative to the beginning of the folding, causes the same displacement relative to the folding of the folding, as compared to the beginning of the folding, giving the same movement relative to the folding of the folding, relative to the scoring mechanism, and in this displaced state, the tape falls on the nose of the crevice; The use of the known scoring mechanism is intended for longitudinal scoring or one tape processed in a folder, or several tapes at once, in the latter case not

exact alignment of the ribbons along their width assembled on the same cradle is ensured (the ribbons disperse in the transverse direction relative to each other due to the reasons mentioned above), therefore such scoring does not ensure the accuracy of longitudinal folding of several tapes on one folding machine, while the accuracy of longitudinal folding on one folding of several tapes are worse than folding one tape; when the scoring mechanism is applied to several tapes superimposed on each other, the load on the drive of the roller with the scoring knife increases significantly, which means that the energy consumed by the drive of the machine increases. In addition, the mechanism for transverse creasing of the longitudinal folded tape (ribbons) on the folding machine is made on a pair of pull cylinders, and since the free path between these cylinders and the place of its transverse folding is significant, the longitudinal deformation of the longitudinal folded tape is subject to oscillations under the influence of these factors, as well as due to the imbalance and skew of the ribbon-holding cylinders and drag rollers and fluctuations in the belt tension in the print shop itself, the place of ribbon bending can so do not coincide with the place exposing it rebated knife, so that the accuracy of cross-cutting and folding in deterioration of the tape. In addition, in the known folding cutters, the cutting of the tape is carried out with knives at once across the entire width of the longitudinally folded tape. In this case, there are large dynamic loads acting on the drive of the folding-cutter and the entire printing press, which lead to a significant decrease in the performance of the printing presses. In known folding-cutting machines, longitudinal ribbed tape is freely inserted between pulling rollers and contact of folding and cutting cylinders, where the tape is punctured with graphews and then chopped, while the folds of the folding cylinder pierce the tensioned tape and due to the difference in linear speeds of protruding the surface of the folding cylinder of the ends of grapheks and tape at the last at this moment and until the movement of the grafeeks to the contact zone of the folding and cutting cylinders is valid first, a discontinuous force perturbation, which causes a sharp increase in the belt tension, and then a moving load along the stretched section, changing the value of the load. The change in the magnitude of this load is due to the change in the radius of interaction of grapheks with a ribbon, and the displacement of this load by displacement of grafecs with a tape. In addition to graphets, in this section of the conductive tape, the last one is affected by the folding cylinder marzan, as well as elastic pads and the knife of the chopping cylinder. Since all these elements (pads, knife, marzan) protrude above the surfaces of the corresponding cylinders, their effect on the tensioned tape is similar to that of graphees. As a result of such a disturbing effect of these factors, parametric oscillations of its tension occur in the tape, and at some tape speeds, the parametric resonance of the tape oscillations, which affect the accuracy of cutting and transverse folding of the tape, and also cause the tape to break.

The purpose of the invention is to improve the quality and performance of the device.

This goal is achieved by the fact that, in a folding-cutter, roll rotary print masks contain a mechanism for longitudinal folding of belts installed in the course of the technological process, including a tape driving cylinder, pinch rollers in contact with it, folding folders, guide rollers and pulling rollers; longitudinal crease, including a disc creasing knife, a mechanism for transverse creasing, containing feed rollers, a creasing knife and an elastic surface for contact with it, placed on one of the feed rollers, a mechanism For transverse folding and cutting a ribbon, which includes a folding cylinder with folding knives on its rollers and a cutting tool containing at least one movable knife and folding rollers, the drive of which is associated with the folding cylinder drive, a mechanism for transverse The creasing is equipped with an additional creasing knife, and the creasing knives are mounted on the respective rollers of the folding cylinder of the mechanism for cross cutting the tape diametrically opposite, respectively folding knives, folding rollers are set eccentrically relative to their geometrical axes.

In addition, the cutting mechanism for the transverse folding and cutting of the tape has a fixed knife with a spiral cutting edge for engaging with the cutting edge of the movable knife and a knife holder with guides mounted concentrically relative to the folding cylinder, while being movable. the knife has a drive of reciprocating movement and is located in the diametral plane of the folding cylinder.

The guides of the fixed blade holder have means for adjusting the radial positions, and the knife is installed in them with the possibility of fixing its positions relative to the folding cylinder circumferentially.

The disk scoring knife of the mechanism for longitudinal creasing is installed on the tape-driving cylinder of the mechanism for longitudinal folding of the tape.

The movable knife of the cutting means of the mechanism for cross-folding and cutting the tape has high-speed cutting edges.

FIG. 1 is a schematic diagram of the proposed folder-cutting apparatus of a roll-type rotary printing machine; in fig. 2 — Roller mechanism design for transverse creasing; in fig. 3-6 - the structure and elements of the mechanism for g transverse folding and cutting the tape; in fig. 7-9 - schemes of drives of the folding rollers.

The folding machine of the rotary printing machine (Fig. 1) contains a mechanism for longitudinal folding of a tape including a ribbon-holding cylinder 1, its drive 2, pressure rollers 3 with an elastic surface in contact with the ribbon-leading cylinder 1, a folding folder 4, guide rollers 5 , pulling pairs of rollers 6, a mechanism for longitudinal bending, including a disc bending knife 7 mounted on a ribbon-holding cylinder 1. A mechanism for transverse creasing of a folder-cutting apparatus contains feed rollers 8 and 9, b A needle knife 10 and an elastic surface 11 for contact with it, placed on the feed roller 9. The mechanism for transverse folding and cutting the tape of this device includes a folding cylinder 12 with folding blades 14 located on its rollers 13 and cutting tools. The mechanism for transverse creasing of the device is equipped with an additional scoring knife 15. The creasing knives 10 and 15 are mounted on the respective rollers 13 of the folding cylinder 12 of the mechanism for cross cutting the tape diametrically opposed to the corresponding folding blades 14.

The cutting mechanism of the mechanism for transverse folding and cutting of the tape contains movable knives 16 with skewed cutting edges, having a drive of reciprocating movement, and are arranged in the diametral plane of the folding cylinder 12 in the guides 17. The drive of the reciprocating movement of the knives has frames 18 associated with with the corresponding eccentric 19, the supports of which are placed in the walls of the folding cylinder 12. The eccentric shafts 19 by means of the levers 20 are kinematically connected with the corresponding cams 21, locked captured on the frame of the device. The cutting means of the mechanism for transverse folding and cutting the ribbon also comprises a fixed knife 22 with a spiral cutting edge 23 for engaging with the cutting edge of the movable knife 16 and a knife holder 24 with guides 25 mounted concentrically relative to the folding cylinder 12. The guides 25 of the knife holder 24 of the knife 16 have a means for adjusting their position along the radius, made in the form of a drive carriage 27 installed in the guides 26. A fixed knife 16 is mounted in the guides 25 with the possibility of fixing it along relative to the folding cylinder 12 circumferentially by means of the fixing screw means 28, the folding rollers 29 of the folding cutter are equipped with a drive 30, kinematically connected with the driving of the folding cylinder 12, and are mounted eccentrically relative to their geometrical axes by means of levers 31 spring-loaded with spring 32 swinging on the respective axes x 33. The kinematic coupling of the drive 30 with the eccentric axes 34, the folding rollers 29 is carried out by means of gears 35. The drive hinges tsuyuschih rollers 29 configured as a differential gear closed on the basis of the eccentric (Fig. 8) and contains central wheels 36 and 37, freely rotating on axes 34 and connected by means of gears 38 and 39, axes 40 and 41 and transmissions 42 s;) by alcemal cylinder 12 on one side. In addition, the drive of the folding VPL11KOV 29 contains planetary wheels 43 and 44 mounted on the folding rollers 29 freely placed on the axles 45, while the eccentric axes 34 are connected on the other side of the folding rollers 29 by gears 46 and 47, axles 48 and 49 and transferring 50 with a folding cylinder 12 on the other side, closure of this differential gear.

Another variant of the implementation of the drive of the folding rollers, also made in the form of a differential closed gear (Fig. 9), differs from the previous one in that the planetary wheels 51 and 52 are rigidly fixed together with the folding rollers 29 on the axles 45. At the same time, the eccentric axes 34 along the other side of the folding rollers 29 are connected by means of a locking gear 53 to each other.

The operation of the proposed folder cutter is as follows.

After sealing in the printing unit

the tape enters the ribbon-leading pair in front of the folder of the adjacent folder cutter — between the drive ribbon-holding cylinder 1, whose drive 2 is kinematically connected with the drive of the folding cylinder 12 and the pressure rollers 3, while the folding disk knife 7 is paired with the elastic surface of one (middle) roller 3 leaves on the surface of the belt, on its side, facing the surface of the folder 4, a scoring trace - a strip. Thereafter, further posting of the tape can be carried out in two ways. The first option - the tape after this scoring enters the folder of this folder-cutting machine. The second variant — the tape, after bending, enters a band-leading pair of another folding-rezalnogo apparatus, superimposed on the tape that enters this other folding-cutting machine,

5 for example, from an adjacent printing unit. In this case, both tapes are oriented relative to each other along their scoring strips and are fed to the folding set of this folding-cutter, i.e., the selection of tapes from

0 two (in the general case from several) printing apparatuses on one front plate.

With the passage of the tape (or selected tapes) along the folder, the bending strip of the tape falls on the nose of the fold-fold. Due to all this, the tape is oriented relative to the folding in two lines lying in the same plane, defined by the creasing edge of the creasing knife 7 and the edge of the folding section 4 forming the longitudinal fold of the tape. This ensures a stable movement of the tape along the entire surface of the folding and also between the printed apparatus and folding. After the longitudinally folded tape has come off the folder 4, it is guided by rollers 5, crimped by pulling pair of rollers 6 and feed rollers 8 and 9, then the tape enters the contact zone of roller 9 having elastic elastic

Q surface 11 (or marzan 54), with the surface of the folding cylinder 12. The amount of clamp to these surfaces of the longitudinally folded tape is controlled by the mechanism 55. The diameter of the roller 9 with the elastic surface 11 is chosen

5 is constructive and can be equal to the diameter of the folding cylinder 12 that mates with it. 12 - The diameter of the feed roller 9 when the merzan is mounted on it 54

must correspond to half the diameter of the folding cylinder 12.

In this contact zone, the scoring knife 10 (or 15) is subjected to a longitudinally folded tape on the blade cycle and transverse creasing is performed. After the passage of this contact zone, the tape, pressed to the surface of the folding cylinder 12, is punctured cyclically by grates 56, and when the folding cylinder is rotated 180 ° later, by graphews 57. After piercing the ribbon with rifles 56 and 57, it enters the interaction zone of the moving blade the knife 16 and the blades 23 of the fixed knife 22. The relative position of these knives is adjusted by circumferentially shifting the knife 22 and the guides 25 and the radial movement of the knife holder 24 in the guides 26.

Fixed knife 22 can be made of composite - from individual knives 58 with cutting edges, each of which is equipped with a screw 59 adjustment device (Fig. 6). In this case, both the knife 22 and the knives 58 are placed in the knife holder 24 located in the circular guides 25 of the carriage 27 with the locking screw mechanism 28, and the carriage 27 are placed in the horizontal guides 26 with the possibility of moving it relative to the surface of the folding cylinder 12 by means of a drive mechanism (not shown).

In addition, the fixed blade 22 may have holes 60 for sucking paper dust formed after cutting the tape.

The interaction of the movable 16 and the fixed 22 blades is accomplished by radially moving the blade 16 by interacting the cam profile .21 with the roller of the rotation lever 20. The use of different cams 21 for driving different knives 16 leads to less wear on their profiled surfaces, but it is difficult to adjust the interaction of one fixed knife 22 with two movable blades 16. Using one cam 21 to drive both movable blades 16 has the opposite effect, i.e. simplifying adjustment and increasing the reliability of the interaction of both movable knives with a fixed knife, but this increases the wear of the cam.

The movement of the movable knife relative to the fixed knife is characterized by three coordinates (Fig. 4): the angle of rotation Y together with the folding cylinder, the radial displacement x and the longitudinal displacement of the point of contact of the cutting edge of the movable knife relative to the profile of the fixed knife.

The relationship between the speed x of the radial movement of the movable knife, the speed of rotation (of this knife together with the folding cylinder, the rotation angle Vpes of this knife, at which the longitudinally folded tape is cut into its width L, is determined as follows. Tape cutting time t fpez / ta Speed longitudinal (along the width of the tape) movement of the point of contact of the edge of the movable knife relative to the profile of the fixed knife

v

The relationship between the speeds x and f at an angle of 5 ° C (Fig. 3) of the straight line of the beveled edge of the movable knife to the axis of rotation of the folding cylinder x Ytg 5f - Finally, the search link accepts

about .

P "

and The edges of the movable and fixed blades at the point of contact are intertwined curves. In the particular case of these cutting blades can be performed as in the considered case:

5, the blade of the movable knife is a flat line to the axis of rotation of the folding cylinder, the blade of the fixed knife is a spiral line. When such mutually-bending edges of the blades of the knives interact, there is no sliding of the surface being cut.

0 tape. At the point of contact of the knives and ensures its reliable high-quality cut. At the time of cutting the ribbon with the movable knife 16, the corresponding graphs 57, interacting with the front free end of the cut section of the ribbon, release it by withdrawing the folding cylinder inside its outer surface. In this case, the blade of the folding knives, having begun to interact somewhat earlier with the surface of the not yet cut ribbon, after

0, the segments thereof are located vertically opposite the contact zone of the folding rollers 29 and interacting with the cut section of the tape at the place of its transverse creasing. Such an interaction with the folds of the folds tape

5 ensures that it is fed between the surfaces of the folding rollers 29. Since the tape, starting from the point of contact of the feeding patch 9 with the surface of the folding cylinder 12 and ending at the exit point of the grates of it, turns out to be evenly pressed against the surface of the folding cylinder, and the arrangement of the folding and folding knives at the time of implementation transverse creasing and folding is obtained in the same plane, then the place of interaction of the folding of knives with the trace of transverse creasing is located exactly opposite the contact of the folding rollers. The rotation of these rollers around eccentric axes 34 (Fig. 1.7)

provides a close approach of the surfaces of the rollers to the surface of the folding cylinder. This improves the process of tightening the cut section of tape from it and tightening it between the surfaces of the folding rollers.

The chopped off part of the tape is pushed by the folding and is folded by the folding rollers 29. In this case, there is a variable distance between the surfaces of the folding rollers, the folding cylinder 12 and the folding knife 14. Crimping the transversely folded notebook by folding the rollers at a variable linear speed of their surfaces in the contact zone provided by resilient pressing rollers with spring devices 32. With such rotation of the folding rollers, the sheet is jerked off from the surface of the folding cylinder, since ineyna rebated surface speed of rollers in the areas of maximum pribotazheni to the surface of the folding cylinder largest, corresponding to the greatest radius of the rollers. In this case, the transverse fold of the sheet is conducted at the highest linear speed through the contact of the folding rollers, which ensures a tight crimp of the transverse fold. The sheet is withdrawn from the fold of their rollers into the collecting pens (not shown) at the minimum speed — with the smallest radius of the folding rollers in the area of their contact, which increases the reliability of the folding of the folded sheets.

The difference in the operation of the folding rollers shown in FIG. 8, from the work of the previous ones (Fig. 7) is that they perform a complex-plane motion, rotating both with axes 34 and around their geometrical axes 45. The first rotation is carried out from the folding cylinder by means of gears 50, 446, 47 and axes 48 and 49, the second through gears 42, 38, 39, axes 40 and 41 and eccentric planetary gears 36 and 43 and 37 and 44. As a result of this drive of the folding rollers, the linear velocities of all points of their surfaces are provided . This improves the quality of the crimping of notebooks over their entire area and the stability of their output to the collecting device.

For the operation of the folding rollers shown in FIG. 9, characteristic is also the equality of the linear velocities of all points of their surfaces. The difference from the previous folding rollers is that they are rotated together with the axles 45, on which the planetary wheels 51 and 52 are rigidly fixed, receiving rotation from the central wheels 36 and 37, respectively, and the axles 45 together with the axes 34 are kinematically are interconnected by closing the movement with gear 53. As a result, the design of the folding rollers and their drive is simplified in comparison with the previous scheme.

The advantages of the proposed device are that the arrangement of the mechanism for longitudinal bending of the tape in front of the folder on the tape driving cylinder ensures a stable, stable position of the moving tape in the transverse direction over the entire surface of the folder and also between the folder and the press, which improves the accuracy of the longitudinal fold tape, and, in addition, provides a stable lateral register of different tapes relative to each other, collected on the same f ltsvoronke, creasing and reducing force of these tapes, because each ribbon biguets separately prior to assembly; Combining the scoring knives for transverse creasing of the tape and folding knives on the same axis in the folding cylinder increases the accuracy of the transverse folding of the tape, since these operations are performed over the tape that is evenly pressed to the surface of the folding cylinder, resulting in a stable exact orientation of the transverse creasing trace on the tape relative to the line of contact of the folding rollers; the tape is guided to the cutting zone when the tape is pressed to the surface of the folding cylinder on a large portion of the arc of a circle, as a result of which the piercing of the tape with the folding cylinder graphs does not cause any changes in the belt tension, which improves the dynamics of the tape guide in the folder fold; The proposed device that cuts the tape in the transverse direction makes it scissor-cut with a smooth knife with little effort, which improves the quality of the cut, reduces the load on the folder, improves its dynamics, and hence the quality of the folding, and provides an opportunity to increase the output of the folder, by about 30%; the metal consumption of the cutting device is significantly reduced, as well as the energy consumed by the drive by about 40%, the conditions for its adjustment are improved, the safety and noiselessness of its operation is improved; The use of rollers rotating around eccentric axes for transverse folding in combination with transverse creasing (and without it) improves the accuracy and reliability of this operation independent of the properties of the material of the folded tape and the mode of operation of the folding device due to improved conditions for contraction of the cut section of tape from surfaces folding cylinder and folding knife.

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Claims (5)

1. FOLDING-RESAL- A NEW DEVICE FOR ROLLED ROTARY PRINTING MACHINES, containing a mechanism for longitudinal folding of a belt installed along the technological process, including a tape drive cylinder, pressure rollers in contact with it, a folding roll, guides and pulling pairs of rollers, a mechanism for longitudinal creasing, including a blade mechanism for longitudinal cutting scoring, containing feed rollers, creasing knife and an elastic surface for contact with it, placed on one of the feed rollers, the mechanism for transverse folding and p tape, including a folding cylinder with folding knives located on its rollers and a cutting tool containing at least one movable knife and folding rollers, the drive of which is connected with a folding cylinder drive, characterized in that, in order to improve the quality and productivity of the device, the mechanism for cross scoring is equipped with an additional scoring knife, and scoring knives mounted on the corresponding rollers of the folding cylinder of the mechanism for transverse cutting of the tape, diametrically opposed gently to the corresponding folding knives, wherein the folding rollers are eccentrically mounted with respect to their geometric axes. 2. The apparatus by π. 1, characterized in that the cutting means of the mechanism for transverse folding and cutting of the tape has a fixed knife with a spiral cutting edge for interacting with the cutting edge of the movable knife and a knife holder with guides installed concentrically relative to the folding cylinder, while the movable knife has a reciprocating drive and placed in the diametrical plane of the folding cylinder. 3. The device according to paragraphs. 1 and 2, characterized in that the guides of the knife holder. the fixed knife have means for adjusting the position along the radius, and the knife is installed in them with the possibility of fixing its position relative to the folding cylinder around the circumference. 4. The apparatus by π. 1, characterized in that the disk creasing knife of the mechanism for longitudinal creasing is mounted on the tape drive cylinder of the mechanism for longitudinal folding of the tape. 5. The apparatus according to claims. 1 and 2, characterized in that the movable knife of the cutting means of the mechanism for transverse folding and cutting of the tape has beveled cutting edges. SU „„ 1155470>