EP0668161B1 - Device for transferring individual sheets to the printing cylinder of a rotary sheet printing press - Google Patents

Abstract

The transfer devices has sheet grippers (4) installed on the on the transfer cylinder (2) which have a front stop for the arriving sheets and are adjustable by a controllable positioning device (9,15) during each rotation of the transfer cylinder. The front stop on passing the transfer position, in which a sheet is transferred to the print cylinder, adopts a position through which the exact register of this sheet relative to the position of the printing plate printing it on the plate cylinder is adjusted. The sheet grippers are mounted on a positioning plate (3) located movably on the transfer cylinder and at each end of this plate an individually controllable positioning device (9,13,15) engages.

Description

The invention relates to a device for transferring individual sheets to the printing cylinder a sheet-fed rotary printing press according to the preamble of claim 1.

Such a device is known from EP-A-0 467 832 made known to the same applicant. This Device allows the position of an arch at the transfer to the printing cylinder always automatically the location of the printing on the plate cylinder attached printing plate is adjusted in register. This eliminates the need for the printing plates even when it is clamped on the plate cylinder in need to adjust exactly the same angular distances, what is tedious and time consuming. Deviations from the actual exact mounting position of the pressure plates are in the mentioned device by the automatic adjustment of the sheets on the transfer cylinder corrected.

The conventional sheet transfer devices had in common that the incoming sheets exactly in the transfer the same rhythm to the impression cylinder the transfer point of the transfer cylinder, on the front edge of the sheet from the grippers of the impression cylinder is always the same. To achieve that when printing on the sheets of the Distance between the leading edge of the sheet and the start of printing, so the free front edge of the sheet is always the same width, had to attach the printing plates to the Plate cylinders are carefully taken care that all printing plates are attached at exactly the same distance with a plate cylinder with two, three or four pressure plates an exact angular distance of 180 °, 120 ° or 90 °. The Condition that all printed sheets are the same must have a large front margin, especially when Security printing, especially when printing banknotes, extremely important, in which the arches one Number of security prints arranged in rows and columns exhibit and then into individual Notes are cut up. Different Widths of the front edges of the sheet, the front edge of which Cutting is used as a reference edge, therefore have faulty Centering the notes of value and thus rejects result.

By the known device described above according to EP-A-0 467 832, however, only one Correction of the bow position in one or the other Circumferential direction can be made, the arc can but not possibly somewhat obliquely to the circumferential direction be set if one is appropriate oblique mounting position of the pressure plate on the Plate cylinder that would require. It means that it when attaching the pressure plates to the Plate cylinders are not at exactly the same angular distances arrives, but on an exact axis parallel Adjustment of the pressure plates, their leading edges exactly parallel to the axis of the plate cylinder must be aligned.

The limitation of adjustment options at the known device on a parallel displacement the arches in the circumferential direction is based on the fact that the transfer cylinder is a relative to its shaft in Has circumferentially adjustable drum on which the bow rests so that a rotation of the Arc obliquely to the circumferential direction with this device not possible.

GB-A-339275 is already one Register correction device known with the arches at the transfer from one cylinder to another Cylinder, for example from an impression cylinder a transfer cylinder are adjustable at an angle. For this the bow grippers are movable on one Transfer cylinder mounted mounting plate, and one grips at each end of this shelf individually controllable control device, which at every revolution of the transfer cylinder End of the shelf by a predetermined amount in Circumferential direction of the transfer cylinder relative to this shifts. This is also an adjustment of the Arch possible at an angle to the circumferential direction. This known device works at each end of the Base plate with a pair of interacting Tooth segments, of which one tooth segment, by means of Adjusting screws adjustable in the circumferential direction, on Pressure cylinder and the other tooth segment on the on the Transfer cylinder mounted mounting plate mounted is. Every time the cylinder rotates the two tooth segments of a pair with each other in Intervention, is according to the setting of the Tooth segment on the impression cylinder by means of the other Tooth segment the relevant end of the positioning plate in Shifted circumferential direction. Once the two Tooth segments of a pair disengage, takes the plate on the transfer cylinder under the Effect of a return spring its through one Stop defined rest position. The parts of this known device must therefore partially on Transfer cylinder and partly on the pressure cylinder be assembled and when operating the cylinder work together.

The object of the present invention is to achieve this the basis in the preamble of claim 1 known device described, in which all parts are mounted on the transfer cylinder or cooperate with this so that they improve - like the known device according to GB-A-339275 - also an adjustment of an arc somewhat obliquely to the circumferential direction to allow one possible inclination of the on the plate cylinder attached printing plates to take into account. In addition, the structure of the device is to be simplified will.

This object is achieved by the im Characteristics of claim 1 specified features solved.

By during each revolution of the transfer cylinder each of the two ends of the movable stored storage space individually around a specifiable Amount adjustable is not easy only one shift of an arc in the circumferential direction, but also a turn in an inclined position allows if namely the two ends of the positioning plate be adjusted by different amounts. All that is needed is the movably mounted one Base plate with the bow grippers and not, as with the known device, a whole drum relative to be adjusted to the cylinder shaft.

A preferred embodiment is in the claims 2 and 3 described.

Further expedient configurations, in particular a preferred training of the two Control devices actuating control devices, result from the other dependent claims.

Figur 1 die Anordnung des Uebergabezylinders am Druckzylinder einer Druckmaschine in der Bogenübernahmestellung und

Figur 2 in der Bogenübergabestellung, wobei alle Einzelheiten des Uebergabezylinders und die Stelleinrichtungen fortgelassen wurden,

Figur 3 eine schematische Darstellung der Anordnung nach Figur 1 in verkleinertem Masstab zusammen mit dem Plattenzylinder, der mit dem Druckzylinder zusammenwirkt,

Figur 4 eine schematische Darstellung des im Axialschnitt gezeigten Uebergabezylinders, der Stelleinrichtungen und der Steuervorrichtungen, und

Figur 5 eine schematische Darstellung in Richtung des Pfeils F nach Figur 4 und zwar in der Nullstellung und, strichpunktiert, in der maximal ausgelenkten Stellung des einen Stellgliedes, wobei zur besseren Verdeutlichung der Stelleinrichtung der Uebergabezylinder grösser als in Figur 4 gezeichnet wurde.

The invention is explained in more detail with reference to the drawings using an exemplary embodiment. Show it :

Figure 1 shows the arrangement of the transfer cylinder on the printing cylinder of a printing press in the sheet transfer position and

FIG. 2 in the sheet transfer position, all details of the transfer cylinder and the actuating devices having been omitted,

FIG. 3 shows a schematic illustration of the arrangement according to FIG. 1 on a reduced scale together with the plate cylinder, which cooperates with the printing cylinder,

Figure 4 is a schematic representation of the transfer cylinder shown in axial section, the actuators and the control devices, and

5 shows a schematic illustration in the direction of arrow F according to FIG. 4, namely in the zero position and, dash-dotted lines, in the maximally deflected position of the one actuator, the transfer cylinder being drawn larger than in FIG. 4 for better clarification of the actuating device.

According to Figures 1 to 3 is the transfer cylinder 2 of the device between a feed roller S and the printing cylinder D of a rotary printing press, especially an intaglio printing machine, arranged, the plate cylinder P (Figure 3) interacts in a known manner with the printing cylinder D. The directions of rotation of all cylinders are in the Figures 1 to 3 indicated by arrows.

The plate cylinder P has at least two printing plates, generally N printing plates, where N is greater than 1 is. In the example considered, the plate cylinder P four pressure plates, which are at an angular distance of approximately 90 ° are mounted, so not necessarily on the A fraction of a millimeter exactly at a 90 ° distance must be adjusted, and also deviations from the Can have parallel axes. In Figure 3 are the four printing segments of the printing cylinder D and the Plate cylinder P indicated.

The sheets B are fed by the feed roller S individually one after the other via an only schematically indicated System table T moves and on the transfer cylinder 2 given, each incoming sheet against the front stop 4a of the articulated on the transfer cylinder 2 Bow gripper 4 transported and from these to Transfer to the printing cylinder D is taken. At the feed roller S can in particular be a known, driven at non-uniform speed Act suction roller. In the illustration Figure 1 is an incoming sheet B straight from the Bow grabs 4 taken over, and in the representation after Figure 2 is the leading edge of sheet B from the transfer cylinder 2 to the sheet gripper G2 of the impression cylinder D passed.

The transfer cylinder 2 leads to a full Turn of the plate cylinder N turns off, in example considered four revolutions, and has a diameter that is 1 / N of the diameter of the Plate cylinder P, so in the example considered Quarter of this diameter. With every revolution the transfer cylinder 2 conveys a sheet.

In the example considered, the pressure cylinder D and the plate cylinder P are the same size, and the Printing cylinder D has four printing plates are, four printing segments covered with blankets and in front of each blanket sheet gripper, of which in Figure 1 the grippers G1 and in Figure 2 the grippers G2 can be seen are.

In the area of the feed roller S is common another well-known front brand, not shown here provided for aligning an incoming sheet B serves and is then pivoted downwards, so that this sheet is conveyed to the transfer cylinder 2 can be.

According to Figures 4 and 5, on which the feed roller S, system table T and printing cylinder D not shown are, the transfer cylinder 2 with its Shaft 1 rotatably mounted in the machine frame 30 and is by a gear wheel attached to this shaft 1 32, which engages in the pressure cylinder gear from Printing cylinders with uniform speed driven. The transfer cylinder 2 thus leads four revolutions when the plate cylinder P is one makes full rotation. Since the impression cylinder D the same Diameter as the plate cylinder P has like it usually the case, of course this corresponds to one Rotation of the printing cylinder D. In principle, however the impression cylinder also has a diameter other than the plate cylinder, especially a smaller one Diameter, with the impression cylinder for example can be as big as the transfer cylinder.

The sheet gripper 4, which with a gripper or Sheet support 4 'cooperate to the respective Adjustment of the position of the incoming sheets adjustable arranged on the transfer cylinder 2. To this Purposes are the sheet grippers 4 on a positioning plate 3 mounted, which in the two side walls 5 and 6 of Transfer cylinder 2 is movably mounted. The For this purpose, positioning plate 3 has at both ends Guide lugs 3a and 3b, which in guide slots 5b or 6b of the side walls 5 and 6 engage. On this Side walls 5 and 6 are articulated roller levers 9 and 10, which in bearings 5a and 6a of these side walls about axes parallel to shaft 1 are pivotable. These roller levers are at their, in the transfer cylinder 2 projecting ends with Carriers 11 and 12 and at their other ends with Rollers 13 and 14 provided.

The drivers 11 and 12 grip between two stop parts 7 and 8 fastened to the setting plate 3 a, which run essentially parallel to the shaft 1 and in the circumferential direction of the transfer cylinder 2 face each other. These stop parts 7 and 8 serve as a play-free guide for the drivers 11 or 12. The rollers 13 and 14 engage in one annular guideway 15c or 16c, which by two concentric ring projections 15a, 15b or 16a, 16b of an annular actuator 15 or 16 on one side or on the other side is formed and surrounds the shaft 1. The two Actuators 15 and 16 are each one above the Shaft 1 fixed pin 17 on the device frame 30 or 18 is pivotally suspended so that they are one axis parallel to shaft 1 can be tilted can. The arrangement is such that the Rollers 13 and 14 when the transfer cylinder rotates 2 in the annular guideways 15c and 16c can roll without play.

Using the controls described below the actuators 15 and 16 individually around the pins 17 and 18 in a vertical are swiveled to wave 1 oriented plane, whereby, as explained below, the setting plate 3 with their bow grippers 4 relative to the body of the Transfer cylinder 2 parallel to the circumferential direction of the same or also in an oblique to the circumferential direction oriented position can be adjusted.

Each of the actuators 15 and 16 has its own Control device. Both control devices are constructed the same way and each have a lever arm 19 or 20, which on the pin 17 and 18 facing away Area of the actuator 15 or 16 is attached. At the Lever arm 19 are, as FIG. 4 shows, so many individual adjustable stops 19a to 19d attached, like printing plates provided on the plate cylinder are four adjustable in the example considered Attacks. On the lever arm 20 are accordingly individually adjustable stops 20a to 20d intended.

In Figure 4, the lever arms 19 and 20 are with their attacks, for the sake of clarity their actual position, which is shown in FIG. 5, shown rotated 90 ° downwards. These attacks 19a to 19d and 20a to 20d lie next to each other and can each with a control cam in the form of a cam 24a to 24d or 25a to 25d interact. All Cams sit on the rotatable in the device frame 30 mounted shaft 23 and have the shape of segments, which are each at an angle of approximately 360 ° / N, in the example considered, extend over approximately 90 °. The angular distance between adjacent cams is 360 ° / N, in the example considered it is 90 °, see above that during a quarter turn of the shaft 23, for example the cam 24a or 25a on the stop 19a or 20a can act while the other cams 24b up to 24d or 25b to 25d are ineffective; in the following quarter turn of the shaft 23 can then Cam 24b or 25b on the stop 19b or 20b act while the other cams are ineffective, etc.

The arrangement is such that during a full revolution of the transfer cylinder 2 Shaft 23 makes a quarter turn with the cams. For this purpose, there is a shaft 23 at one end Gear 27 attached, the diameter of which four times is as large as a gear 31 on shaft 1 and driven by this toothed wheel 31 by means of a toothed belt 26 becomes. In general, the shaft 23 leads with the Cams with one full revolution of the transfer cylinder 1 / N revolutions.

The lever arm 19 with its stops 19a to 19d, as shown in FIG. 5, by a lever end attached tension spring 21, the other end of the frame 30 is fixed in the direction of the cams 24a to 24d or in the direction of a fixed stop 22 drawn, which is attached to the frame 30. In the in Figure 5 position shown with solid lines the lever arm 19 is under the action of the spring 21 fixed stop 22 on, since all adjustable stops 19a to 19d assume a position that is sufficient is far from the cams 24a to 24d. This Position of the lever arm 19 with the actuator 15 is referred to as the zero position, in which the annular Guideway 15c concentric to axis 1 of the transfer cylinder 2 lies.

In the dash-dotted line shown in Figure 5 Position of the device takes the stop 19a Position 19a 'on. In this position, he's so far in Adjusted towards the cam 24a assigned to it, that this cam is going through its effective Position pushes against this attack and it so far pushes back that the lever arm 19 with his Actuator 15 relative to the zero position around the pin 17 clockwise, against the action of the spring 21, is pivoted. This dot-dash position should represent the maximum deflection.

The above description applies in the same Way for the arrangement and function of the other actuator 16 with its lever arm 20, for which a corresponding Tension spring and a corresponding fixed stop are provided, as well as for cooperation the stops 20a to 20d with the cams 25a to 25d. Since the control of the two actuators 15 and 16 from each other is independent, this can be an actuator Take zero position while the other actuator pivoted more or less from its zero position is.

With every full revolution of the transfer cylinder 2, the actuators 15 and 16 are individual according to a predetermined program, which is carried out by the individual adjustment of the adjustable stops 19a to 19d and 20a to 20d is defined, either leave it in its zero position or at the fixed pin 17 or 18 adjusted depending on whether a cam 24a to 24d or 25a to 25d when passing their effective position the assigned adjustable Stop 19a to 19d or 20a to 20d by one more or less or less.

The position of the adjusting plate 3 in is essential the moment when the leading edge of a sheet located on the transfer cylinder 2 under Opening the bow gripper 4 to the bow gripper of the Printing cylinder D is transferred, as shown in Figure 2. The position of the arch at this point determines the later registration-based adjustment of this Sheet to the relevant printing plate of the plate cylinder. It is assumed in the following that it is at the two positions shown in FIG these positions when the sheet is handed over.

The zero position is chosen so that a possible Correction of the position of the bow only in the a circumferential direction needs to take place. The maximum possible deflection becomes the size of the tolerance of the According to experience, panel mounting means that maximum inaccuracy when attaching the panels on the plate cylinder, adjusted.

In the position of the transfer cylinder, in which its bow gripper 4 an incoming bow take over, there are the actuators 15 and 16 and thus this bow gripper always in the zero position. If no correction of the bow position is necessary, is the stop in question is set so that it stops from the cam in question is not touched. Therefore take when transferring a sheet from transfer cylinder 2 to the pressure cylinder D both actuators 15 and 16 unchanged their rest position, as in Figure 5 in solid lines for the lever arm 19 with the actuator 15 and the guideways 15c and 16c are concentric to the cylinder axis 1. Therefore no displacement of the positioning plate 3 with the sheet grippers 4, and the sheet experiences on the transfer cylinder 2 no shift.

It is assumed that the following sheet for the purpose of correcting the position in a circumferential direction oblique position must be moved, namely in the maximum bank angle. For this purpose, the following is adjustable stop 19b around the maximum possible amount shifted towards the cams, like that for the position 19a 'of the stop 19a in Figure 5 is shown in broken lines. After the Transfer cylinder 2 a full revolution and therefore the Camshaft 23 has made a quarter turn, the following cam 24b assumes its working position and causes a by pushing back the stop 19b maximum deflection of the lever arm 19 with the actuator 15. The other actuator 16 remains as assumed should be in its zero position. By the deflection of the actuator 15 becomes its guideway 15c eccentric to the cylinder axis 1 in the illustration Figure 5 pivoted to the left. This will make the Positioning plate 3 with the bow grippers 4 on it Figure 5 left end through the roller lever 9 in the shifted one circumferential direction while her other The end remains unshifted. Therefore, he has the Printing cylinder D handed sheets an oblique position, which of the corresponding inclined position of the pressure plate on the plate cylinder.

In an analogous manner, of course, by appropriate Setting one of the stops 20a to 20d on the other hand, the guideway 16c and thus the other end of the plate 3 are moved, so that the bow shifted diagonally in the other direction becomes.

If the appropriate stops on both sides 19a and 20a, 19b and 20b etc. by the same Amount are adjusted and therefore by them assigned cams 24a and 25a or 24b and 25b etc. be repelled by the same amount, then means that the two actuators 15 and 16 by lever arms 19 and 20 by exactly the same Amount adjusted in the same circumferential direction will. That has a purely parallel shift of the Result. Only if due to different Settings of the simultaneously effective stops 19a and 20a, 19b and 20b etc. the two ends of the Placement plate 3 adjusted by different amounts then this corresponds to the adjustment of the concerned Bow in an inclined position.

The stops 19a to 19d and 20a to 20d individually adjusted so that each time the Transfer cylinder an individual correction of the position the positioning plate 3 and thus the position of the sheet takes place, such that this bow when handing over the bow to the impression cylinder to achieve a perfect Print register occupies the required position. To this In this way, all sheets have a constant after printing Margin width between the leading edge and the start of printing.

This individual setting of the stops 19a to 19d or 20a to 20d takes place in the considered Example using the schematically illustrated adjustment screws 28a to 28d and 29a to 29d.

Such an adjustment of the stops can either before the start of the printing operation due to some Test prints by hand, for example using the schematically illustrated adjustment screws, or there are servomotors provided for which are each assigned to an adjustable stop is. These actuators are either by Pressed a button from a control panel or else as a function of automatically by reading register marks measured register deviations controlled. For example, in the case of unprinted sheets the register marks applied during printing, by reading the positions of the following ones Sheets are corrected. When the incoming sheets a first print, for example a surface, can then be applied in the first printing unit Register marks for automatic register correction to serve.

In general, it is enough to have a maximum shift the positioning plate 3 opposite the transfer cylinder To provide 2 of, for example, two millimeters, because the adjustment of the printing plates on the Plate cylinders with a maximum tolerance of two Millimeters without difficulty or time is possible.

Claims (5)

1. A device for transferring single sheets to the impression cylinder (D) of a sheet fed rotary printing machine which has a plate cylinder (P) provided with N printing plates, N being a whole number greater than 1, having a transfer cylinder (2) which interacts with the impression cylinder (D), whose diameter is 1/N of the diameter of the plate cylinder (P) and which completes N revolutions when the plate cylinder (P) does one revolution, having sheet grippers (4) which are installed on the transfer cylinder (2), have a front stop (4a) for the arriving sheets (B) and are adjustable by a controllable setting means (9, 11, 13, 15, 10, 12 14, 16) during each revolution of the transfer cylinder (2) in such a way that, when passing through the transfer position in which a sheet is transferred to the impression cylinder (D), the front stop (4a) assumes a position by means of which the precise register of said sheet is adjusted relative to the position of the printing plate which prints it on the plate cylinder (P), characterized in that the sheet grippers (4) are mounted on a setting plate (3) mounted movably on the transfer cylinder (2), in that the individually controllable setting means (9, 11, 13, 15; 10, 12, 14, 16) engages at each end of said setting plate (3), which setting means displaces the relevant end of the setting plate (3) by a predeterminable amount relative to the transfer cylinder (2) in the circumferential direction thereof during each revolution of the transfer cylinder (2), in that each of the two setting means has an actuator (15; 16) which is arranged at the side of the transfer cylinder (2) and is suspended so as to be pivotable about a stationary journal (17; 18) above the axis (1) of the transfer cylinder (2) in a plane oriented perpendicular to said axis, in that said actuator (15; 16) has an annular guide path (15c, 16c) which surrounds the axis (1) of the transfer cylinder (2), and in that a roller lever (9; 10) is mounted pivotably in each case in each side wall (5; 6) of the transfer cylinder (2), one end (13; 14) of which roller lever is guided without clearance in the said annular guide path (15c, 16c) during rotation of the transfer cylinder (2), and the other end (11; 12) of which is set up to displace the relevant end of the setting plate (3) when the said guide path is located in an eccentric position relative to the axis (1) of the transfer cylinder (2).
2. The device as claimed in claim 1, characterized in that the said roller lever (9; 10) is pivotable about an axis oriented parallel to the axis (1) of the transfer cylinder (2) in the side wall (5; 6) of said transfer cylinder, and in that end of said roller lever acting on the setting plate (3) is a carrier (11; 12) which interacts with stop parts (7; 8) attached to the setting plate (3) and serving as a clearance-free guide.
3. The device as claimed in either of claims 1 or 2, characterized in that each actuator (15; 16) can be pressed under the effect of a spring (21) against a stationary stop (22) which defines a zero position of said actuator.
4. The device as claimed in any of claims 1 to 3, characterized in that a lever arm (19; 20) is attached to each actuator (15; 16), on which lever arm N stops (19a to 19d; 20a to 20d) are arranged adjacently and are individually adjustable by means of adjusting devices (28a to 28d; 29a to 29d), and wherein these adjustable stops can interact with N cams (24a to 24d; 25a to 25d) which are attached adjacently to a common shaft (23), located opposite the relevant stops, and at an angular interval of 360°/N, the shaft (23) bearing the cams completing 1/N revolution during one full revolution of the transfer cylinder (2).
5. The device as claimed in claim 4, characterized in that the individually adjustable stops (19a to 19d; 20a to 20d) are adjustable by means of adjusting screws (28a to 28d; 29a to 29d) or by means of setting motors which can be switched on by hand or can be controlled as a function of the register deviations which are measured automatically by reading register lays.

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