DE454272C - Device for putting the sheets on and off in platen printing presses, especially in platen printing presses for multi-color printing - Google Patents

Description

The invention relates to a device for the automatic creation and removal of the Sheets in platen printing presses, i.e. lifting the sheets from the stack, transferring them to the feed table, the advancement in the gripper and straightening in this; further the movement over the printing forms, holding during the printing process to achieve a precise register, depositing on the depositing table and transferring to the depositing pile. The invention is suitable for use on simple platen printing presses, but in particular also on those for Multicolor printing. Of these, those types of platen press are the most suitable for the application of the invention, in which both crucibles, provided that there are, for example is a two-color printing machine, are arranged at an angle to each other and together against the associated pressure foundations be moved without performing a substantial angular movement.

The object of the invention is illustrated on the drawings, namely put dar:

Fig. Ι and 2 the type of movement of the grippers on a platen printing press for two-color printing in two end positions in front view, Fig. 3, 4 and 5 three different ways of arrangement of the loading and unloading table on the two crucibles in connection with the gripper track, also in front view, Fig. 6 the sheet lifting and transferring device in its two end positions in a general representation in side view,

Fig. 7 and 8 the same device in a detailed representation in a side view or supervision,

Figs. 9 and 10 show part of the same device in two embodiments,

Fig. 11 and 12 show a section of the gripper path with gripper and feed device in front view and top view, this with a partial longitudinal section along the line α in Fig. 11,

Fig. 13 a part of the same device in a plan view,

Fig. 14 shows an embodiment of the stop for backing and holding the Gripper during the printing process in connection with a section of the gripper path in front view,

Fig. 15 a second embodiment of the stop in the form of a lever, also in a front view,

Fig. 16 a roll paper holder viewed from above,

Fig. 17 the device for four-color printing.

The platen printing press equipped with the feeding and laying device (Fig. 1 and 2) for the production of two-color prints consists of two crucibles 1 in a known manner

and 2, which are articulated at both ends of a yoke 3 and by means of the push rods 4 can be moved against the two associated pressure foundations 5 and 6. These are also articulated in the machine frame stored and cooperate with the crucibles in such a way that both are inevitably linked to each other shortly before and after printing be guided so that a parallel pressure is created. During the rest of the larger Part of the stroke, on the other hand, moves the crucible and pressure foundations independently of one another and in their angular deflection by guides not shown in the drawing and stops limited. The push rods 4 are only in the vertical direction in guides 7 of the machine frame are movable and encompass the eccentric disks by means of three rollers 8 9, which sit on the main shaft of the machine. As a result of these arrangements, crucibles 1 and 2 appear in motion in its upper end position a rest, the length of which is the distance of the upper Roles 8 depend on each other. The subject matter of the invention thus initially closes these known devices indicates that the backs of the crucibles together have an interrupted center, and storage form serving level. Behind this are the two stacking tables 11 and 12, of which the first for the feed pile, the second for the discard pile is determined.

In the upright position of the crucibles, both the crucible backs and the two are located Stacking tables 11 and 12 on one level - in Fig. 2 in cover - so that the overview of all important processes during the pressure is much easier and also promoted by the low height of the machine will. The stacking table is known with the stack of paper on it Mechanically lifted way, with a sensing device used to regulate the circuit.

Above the stack 11 is the attachment device attached to the machine frame like a console (Fig. 6, γ, 8, 9 and 10). This consists of a shaft 13 running across both stacking tables 11 and 12 (Fig. 6), which is driven by means of a gear 14 from a "'rack 15. This is on a vertically movable part of the machine, for example on the push rod 4, and therefore rotates the gear 14 now in one direction, now in the other. This movement is transmitted by means of a gear 16, which is fastened to the end of the shaft 13, to a rack 17, which is in the holder 18 (Fig 7 and 8) of the feeding device. At the front end, the rack 17 carries the feeding gripper, which consists of the pincer lever 19 and the counter plate 20. The sheet 21 (Fig. 6) to be applied for printing is clamped between the two The necessary opening of the gripper 19, 20 and storage takes place by means of a rod 23 under a spring tension 22, which is housed in the interior of the U-shaped rack 17 and is connected to one end of the pincer lever 19. The left end the pull rod 23 is hinged to a small lever 24 at the end of the rack 17, in the protective sleeve 25 a trap

26 is rotatably mounted. When the rack 17 turns to the left, the lever 24 also pushes its upper end against the trap 26 and performs a clockwise rotation to finally hit through. With these movements the opening is immediate subsequent closing of the feed gripper 19, 20 during the lifting of a sheet 2i from the Stack linked. When the rack 17 is clockwise, the lever 24 hits with his lower end to the adjustable pin

27 and opens the positioning gripper 19, 20, to release the sheet conveyed onto the feed table 35 there.

The lifting of a sheet from the stack 11 is carried out by a device on Holder 18 is attached and consists of a "horizontal axis 28 rotatable in this", at both ends of which two levers 29 are articulated, which are jointly with the axis

28 in vertical planes and independently of one another in approximately horizontal planes about the seated in the axis 28 vertical pin 28 ° can swing. One Leaf spring 30, the sic] i against surfaces on the The ends of the lever 29 applies, thereby ensuring that they return to the normal position. On the Top of the levers 29, near their front ends, are inclined sliders 31 arranged of a special shape, while on the underside of the lever 29 in i ° 5 Holders 32 rubber blocks 33 are clamped.

Figs. 9 and 10 show two different forms of the contact surface of the rubber blocks 33, the first form for lifting a stiffer printing paper, the second form for thinner, such as newsprint, is suitable.

A clamp 34 attached to the rack 17 engages the sliders when it is turned to the left 31 from the outside, presses them down on the upper sloping surfaces and at the same time the lateral inclined surfaces together to release them when they have reached the left end position, the return to the normal position takes place under the influence of the spring. These movements cause a pressure of the Rubber blocks 33 on the uppermost sheet 21 underneath (Fig. 6) of the stack, where-

at the same time by pushing the bow together its bulging in the middle takes place. The resulting arch pad is laterally through the rubber blocks 33 and above limited and regulated by the plate 20. During the formation of the puff in the arch 21 is captured by the opened positioning gripper 19 the edge of the arch in the wad, immediately afterwards it closes, approximately ίο at the turning point of his movement. The levers 29 are released from the bracket 34, which passes between them when they go back, without depressing them, so that the lifted sheet is pulled freely to the right on the feed table 35, where he by opening the feed gripper 19.20 as a result Pushing the lever 24 against the pin 27 is deposited.

The feed table 35 (Fig.i and 2) is either through the level, horizontal crucible back itself formed or arranged on this as a special rotatable plate. The bow laid down on the feed table is started from the rear edge or with the help of rubber strips pushed into one of the crucible grippers 36 described below and then in known Way adjusted by a laterally arranged, not shown in the drawing sliding mark.

The crucible gripper 36 (FIGS. 11, 12, 13) consists of two strips 36 and 37 which are connected to one another in a hinge-like manner by an axis 38 and which are pressed against one another by torsion springs 39. The resulting friction between the gripper and the sheet of paper is reinforced by rubber cords which are embedded in grooves 40 in the upper strips 36 and inserted at the ends through bores 41. The sheet is held in a fixed position in the gripper 36, 37 by stops 42 which are fastened in the base strip 37 and protrude through holes above the upper strip 36. This is provided at both ends with the pressure levers 43 used to open the gripper. The crucible gripper 36 is articulated by means of the longer base strip 37 at both ends in links which, similar to those of a GaIlsee chain, consist of two tabs 44 and riveted track rollers 45. In the link 44 on one side, the gripper bar 27 can be rotated by a bolt 46, while in the link on the other side it is also slightly longitudinally displaceable by means of an elongated hole 47 in order to compensate for any small lateral movements that may occur. The members 44 lie loosely on each side of the crucibles 1 and 2 in U-shaped tracks 48 which are open inward and form rings around both crucibles (Figs. 1 and 2) according to their shape; However, in order to be able to follow the slight oscillating movement of the crucibles 182, these are interrupted in the middle at the top and at the bottom. The length dimensions of the links 44 and their number is dimensioned so that they fill the tracks 48 so far that they can follow the oscillating movement of the crucibles as well as the directional movement of the two grippers 36, 37 located on the pressure foundations 5 and 6 during the printing process .

In the embodiment chosen as an example, a platen printing press for two-color printing are four grippers 36, 37 erf order-Hch, whereby at the moment of printing the first in front of the feed table 35, the second and the third stands in front of crucibles 1 and 2 and the fourth above the delivery table (Fig. 1). To each press these four crucible grippers 36, 37 are by one field, i.e. by the distance between to move two neighboring grippers in the opposite direction to the clockwise movement, so that one stroke takes up half of this distance (Fig. 2). For the purpose of this Displacement of the crucible grippers 36, 37 are on the outside of the rails 48 racks 49 attached, in each of which two gears 50 engage, which are guided by two sliders that can be moved on the racks 51 supported shafts 52 are connected to one another. On one side of the crucible; about the front, i are mounted in the sliders 51 bolts 53 ,, which the Shift levers 54 serve as points of application (Fig. Ι and 2). You are rocker 54 mounted on a cross piece of a push rod 4 and by rollers 55 in curves 56 out, which are connected to the machine frame. As a result, the Upward movement of the push rod 4 spreads the two shift levers 54 (Fig. 2) and move the sliders 51 by means of small links 57 encompassing the switching pins 53 outwardly. These movements are transmitted through the mediation of the shafts 52 also on two pairs of pawls 58 and 59, which sit on the shafts 52 by means of hollow axles 60. The pawls 58 are pressure pawls and act when the shift lever 54 is spread apart, so when lifting the crucible; the pawls 59 (Fig. 2) are pull pawls and act when switching levers 54 approach one another, i.e. when lowering the crucible. Both Pawl pairs 58 and 59 alternately move the bolts 61,. those on individual links 44 protrude inward and for the purpose of precise alignment of the crucible grippers 36, 37 with one another with eccentrically adjustable Bolt heads (Fig. 13) are provided.

The structure of the gripper tracks 48, i.e. the guide line of the crucible grippers 36, 37 against, -

above the feed table. 35 and table 6: can be of different types (Fig. 3, 4, 5) If the tables 35 and 62 are to be given a fixed position in one plane (Fig. 3), then by the shapes of the gripper tracks 48 to ensure that the crucible grippers 36, 37 to stand exactly in front of the edge of the feed table 35 to get the To allow insertion of the arch. This is done by shutting down the Grab track 48 under the feed table. 35 and leading up on its edges, so that the crucible gripper 36, 37 can pass under the feed table 3 S to 'its surface to be kept free for interim mooring, but at the same time what is ultimately necessary Position opposite the table edge of the feed table 35 to achieve. The gripper track 48 is used for storing the sheet guided over the delivery table 62, so that the sheet by opening the crucible gripper 36, 37 falls on the plate 62.

In contrast to this arrangement, the gripper track 48 on the feed table 35 and feed table 62 run in a straight direction (Fig. 4), which means easier manufacture and less wear and tear during operation is, so will the feed table. 35 is also attached above the gripper track 48; however, the crucible gripper 36, 37 does not get directly into the area where it is to be placed

required position. For this purpose, the feed table 35 is rotatably arranged and, after the crucible gripper 3 6, 2> 7 has reached its end position in front of the table, is lowered by the necessary amount, "as indicated in Fig. 4 by a dashed line The other structure is the same as in the embodiment illustrated by FIG.

In order to combine the advantages of the two previous embodiments to a certain extent, ie to bring the feed table 35 and the lay-down table 62 into one plane and to guide the gripper track straight, a device is chosen in which the crucible grippers 36, 37 over both tables walk away (Fig. 5). The feed table 35 must therefore be lifted for the insertion of the sheet onto the crucible gripper 36, 37, as indicated in Fig. 5 by a dashed line. The same applies to the delivery table 62 when using the device described below of a two-color platen printing press for four-color printing. In this embodiment it should be noted that the sheet must be laid down on the feed table 35 before the next crucible gripper 36, 37 reaches it. The positions that the crucible grippers 36 through. Mediation of the shift lever 54 obtained, are not of the certainty due to the necessary clearance between the members 44 that they ensure the exact accuracy of the individual work during the pressing. Thus, the application of the sheet in the crucible gripper 36 * 37 must be done with care in order to achieve the same distances from the front and side edges with every single print. For this purpose it is necessary to give the crucible gripper 36,37 a steady and unchangeable position in front of the edge of the feed table 3S. The members 44, between which the crucible grippers 36, 37 are mounted (FIG. 11), are therefore equipped with inwardly projecting bolts 63 which are grasped and held at the appropriate time by fork levers 64 mounted on the gripper track 48. The fork levers 64 are connected to one another by a shaft 65 and are driven from the outside in an expedient manner, whereby they first grasp the bolts 63 and a little later press down the Hebei 43 of the crucible gripper 36, 37 by means of the pressure bolts 66 seated on them and therefore open them . As the movement continues, the outer fork part hits the lever 67 (Fig. 11), the deflection of which causes the movement of the slide mark for the sheet - not shown in the drawing. In a chronological order, the crucible gripper 36, 37 is first held, then its opening, whereupon the sheet is straightened in the crucible gripper 36, 37, then it is closed and finally released by the fork lever 64.

The same accuracy as when applying the sheet must be used when setting the crucible gripper 36, 37 in front of each of the two crucibles 1 and 2 can be observed during the printing process, as this provides the correct overpressure of the two Colors on top of each other, the so-called register, depends. To avoid any malfunction of the register. Wrinkling of the arch To prevent this, this is given an additional movement in the direction of the sheet feed shortly before printing, which at the design of the platen printing press assumed here, for example, is all the more advantageous, than the arches under the crucibles are in a hanging position and therefore cause wrinkles tend. When generating the additional movement of the arches and when subsequently holding on the crucible gripper 36, 37 is based on the consideration that it is necessary the crucible gripper 36,37 not actually to the crucible 1 or 2 on which it is guided is, rather than to the foundation 5 or 6 supporting the printing forme in a to bring a fixed position, since this is the

intermediate sources of error are eliminated. There are two embodiments of such a device (Figs. 14 and 15). Both set a sufficient one Clearance between the links 44 ahead so that no jamming occurs.

In the first embodiment (Fig. 14) are within the gripper track 48 and tight next to this on each pressure foundation 5 and 6 on both sides two bifurcated above Lasehen 68 fastened in the which also serve to hold the gripper members 44 Pin 61 fit exactly. One leg 69 of the forked part of the tabs 68 serves to slide off and move the gripper member carrying a crucible gripper 36, 37 44 when it approaches the pressure foundation 5 together with the crucible 1. Here is the sheet held by the crucible gripper 36,37 with the assistance of below described paper holders tightened until shortly before the pressure the bolts 61 in the parallel Part of the forked tabs arrive and thus the crucible gripper 36, 37 in its position hold tight. Instead of being fixed, the tabs 68 can also pivot about a bolt on the foundation 5 are arranged to ensure an exact parallel position of the crucible gripper 36, 37 for To be able to make edge of the pressure foundation 5.

The second embodiment of the device for the same purpose (Fig. 15) consists in the use of a lever .70 which can perform a compound pushing and rocking movement. For this purpose, the lever 70 is mounted by means of a cut hole on the correspondingly shaped head of a short lever 71 articulated on the pressure foundation 5. At the other end of the lever 70 there is a cutout 72 of a shape corresponding to the cross section of the crucible gripper 36, 37. At the bottom, the lever 70 is provided with a stop 73 which contains a cam 74 which slides on a bolt 75. When the crucible 1 is lowered, the crucible gripper 36, 37 lies in the cutout 72 of the lever 70 and presses it downwards against the action of a spring 76, the lever 70 being pushed along the bolt 75 by means of the curve 74; the end position is indicated in Fig. 15 by a dot-dash line. As a result, the lever 70 initially receives a compound feed and rotary movement and then a short pure rotary movement, which is communicated to the crucible gripper 36, 37 and causes the sheet to tighten shortly before printing. The exact adjustment of the levers 70 to one another can be achieved in that the bolts 75 are arranged on levers yy , which can be adjusted by screws 78 attached to the pressure foundation 5.

The smoothing of the sheets resting on the crucibles 1 is due to the hanging Position, as it is assumed here, to be effected with special care, otherwise an impairment of the register can easily take place. Also requires the small space available between the crucible surface and the foundation during printing as well as the ease of adjustment the bow holder sitting on the crucible, that these are kept mechanically very simple. This is done by observation assumed that the bow drawn between two bow holders 79 the endeavor shows sagging in the middle without special tutoring. This disadvantage is avoided by (Fig. 16) in near the two edges of the sheet 21 on the crucible adjustable holder 79 attached the ends of which are bent outwards and there are small crowned ones Bear roles 80. These lie with spring pressure against the arches 21 and give it the effort to move outwards when pulling it through in the direction of the arrow to move towards. This gives the arch a certain tension across its width, go which compels him to lie flat on the crucible despite the hanging position. The roles 80 can also be coated with a coating such as rubber when processing smooth types of paper, be provided.

The general arrangement of the, machine and in particular the bow guide allows it to be without essential additional organs of the present platen printing press instead of two colors in one operation, their too to print four on top of each other, although the paper size to be processed is only about half the size it can be for two-color printing. It will be on every pressure foundation two printing forms closed next to each other; accordingly, each inking system must be subdivided so that it has two colors can promote separately on these printing forms, which is based on well-known models is effected. The most important measure here is the guidance of the printed sheet through the platen press (Fig. 17).

For this purpose, the sheet is removed from the stacking table 11 in the manner described above lifted off and by means of the positioning gripper 19, 20 seated on the rack 17 on the front Part of the feed table 35 placed, where it is by sliding marks 81 in the crucible gripper 36 is pushed and adjusted there. The sheet 21 then comes under the two crucibles and is printed there with two colors, whereupon he moves to the front

Part of the filing table 62 is placed. There takes place by means of the slide 82 and while a gripper passage a shift of the sheet 21 to the rear part of the Deposit table 62 instead, whereupon it moves through the slide 83 into the next crucible gripper is moved. This takes the sheet back on the rear part of the feed table 35j where he is through the sliding marks 84 in the to receive a new sheet-opening gripper 36 is adjusted to now again under both Crucible to arrive. There the third and fourth colors are printed and the sheet finally placed on the rear part of the filing table 62, where it is removed from the filing is detected and conveyed onto the stacking table 12. This dropping the one and pushing the new sheet over on the delivery table 62 takes place at the same time, so that a four-color print is produced with each double stroke of the platen printing press.

Claims (19)

Patent claims: i. Device for putting on and taking off the sheet in platen printing presses, especially in platen printing presses for multi-color printing, in which the platen Angled to each other and short with the associated pressure foundations before and after printing are inevitably and in parallel, characterized in that that two stacking tables (11 and 12) with an add-on table (35 or 62) in the upright position the crucibles (1 and 2) lie in one plane and the arches from Stacking table (11) at the side of the feed table (35), then under the two crucibles (1 and 2) are led away to the delivery table (62), from which the sheet is laterally be placed on the stacking table (12). 2. Apparatus according to claim 1, wherein by bulging the to be applied A bow puff is formed, characterized in that the puffing of the sheet (21) by pressing it down and pushing it together at the same time two symmetrically arranged fountain blocks (33) takes place in the conveying direction and the edge of the sheet is then grasped at the building site by the application gripper (19, 20). 3. Apparatus according to claim 2, characterized in that two after all Sides articulated, the fetlock blocks. (33) carrying lever (29), which is in the normal position by a spring (30) are held, equipped with sliding surfaces (31) arranged at an angle in the room are, which are arranged by a on the reciprocating feed gripper (19, 20) Bracket (34) are influenced. 4. Apparatus according to claim 3, characterized in that the fetlock blocks (33) are provided with straight or inclined, different depths of corrugations or grains to make them the work surface adapt to the type of paper to be processed. " 5. Apparatus according to claim 1 to 3, in which the crucible gripper consists of two hinged strips, characterized in that the adhesion between the sheet and the crucible gripper (36,37) by in the grooves a gripper strip (37) lying rubber cords (40) is increased. 6. Apparatus according to claim 5, characterized in that the crucible gripper (36, 37) rotatable with one end, otherwise immovable, with the other end rotatable and laterally displaceable in members (44) provided with track rollers (45) which together with clawless members (44) in their entirety two on both sides of the Crucibles (1 and 2) arranged, their shape adapting, 'on two opposite Fill in places with interrupted tracks (48) with little margin. 7. Apparatus according to claim S, characterized in that two on the 'Rails (48) sliding pieces (51), "which by means of toothed racks (49) and Gears (50) are moved uniformly by two with the sliders (51) related pawls (58) directly or indirectly the crucible gripper (36, 37) move. 8. Apparatus according to claim 7, characterized in that the pawls (58) sit on a tube (60) that is pushed over the shaft (52) connecting the gears (50). 9. Apparatus according to claim 7, characterized in that the of the The latch (58) of the pin (61) of the gripper members (44) is mounted eccentrically are. 10. The device according to claim 9, characterized in that two with the Crucibles (1 and 2) moving up and down lever (54), those of scenes (56) a symmetrical angular movement is given on the machine frame, alternately move the two feed devices for the crucible grippers (36, 37). 11. The device according to claim 1, characterized characterized in that the loading and unloading table (35 or 62) in one plane lie and the gripper track (48) under the feed table (35) and above the feed table (62) is designed so that the crucible gripper (36,37) in the plane of the Arrive feed table (35) when creating a sheet. 12. The device according to claim ii, characterized characterized in that the gripper track located above the crucible (r, 2) (48) guided in a straight line and the feed table (35) can be swiveled over the grab track, the delivery table (62) is firmly arranged under the grab track (Fig. 4). 13. Apparatus according to claim 11, characterized characterized in that when the gripper track (48) is guided in a straight line over the crucibles, both the feed table (35) and the delivery table (62) are also pivotably arranged under the gripper track. 14. The device according to claim 1, characterized in that the crucible grippers (36, 37) are detected and held directly or by means of bolts (63) of the gripper members (44) during the creation of a sheet by fork levers (64), the time one after the other also the Open the crucible gripper and cause the sliding mark to move (Fig. 11). 15. The device according to claim 14, characterized in that the crucible grippers {36,2,7) during the pressure on the crucibles (1 and 2) directly or by means of bolts (61) on the members (44) a small feed movement in the direction the sheet conveyance is granted with subsequent holding against the pressure foundation (5 or 6), namely in that the bolts (61) slide along the flanks (69) of sliders (68) which are fixed to the pressure foundations (5 and 6) or adjustable. 16. The device according to claim 14, characterized characterized in that the crucible gripper (36,37) directly or indirectly a small advance movement in the direction of the paper feed followed by Hold on to the pressure foundation (5 or 6) by rotatably and displaceably mounted their movement obtained by bolts (7.5) and curves (74) receiving spring-loaded lever (70), which at the front end for receiving the Crucible grippers are provided with a cutout (72). 17. The device according to claim 16, characterized in that the cam bolts (75) are mounted on levers {77) which are adjustable by means of screws (78). 18. The device according to claim 1, characterized characterized in that the sheet (21) adhering to the crucible (1,2) is resilient Holders (79) are provided at the front with obliquely outwardly directed rollers (80). 19. The device according to claim 1, characterized characterized in that on each of the two pressure foundations (5 and 6) two Printing forms are closed next to each other and the sheet (21) by half After the front printing forms have been printed, the crucible format is pushed back onto the delivery table (62) and then over the feed table (35) also passed the rear molds and then, printed with four colors, is filed. For this purpose 2 sheets of drawings.