EP0185965B1

EP0185965B1 - Transfer cylinder for a rotary sheet-printing press

Info

Publication number: EP0185965B1
Application number: EP19850115216
Authority: EP
Inventors: Willi Becker; Norbert Dr. Thünker
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 1984-12-28
Filing date: 1985-11-30
Publication date: 1989-03-15
Also published as: JPS61158450A; EP0185965A2; JPH0524837B2; CN85104700A; DE3447596C2; EP0185965A3; DE3447596A1; CN85104700B

Description

The invention relates to a sheet transfer cylinder for sheet-fed rotary printing presses according to the preamble of patent claim 1.
In multi-color sheet-fed rotary printing presses in series, the paper sheet is moved from one printing unit to another in the. transported for example by means of a generic sheet transfer cylinder. The sheet of paper lies with the printed side on the outer surface of the sheet transfer cylinder, which is why it is possible to smear the still wet print.
In order to be able to process different paper qualities and thicknesses from thin pile paper to cardboard paper with a sheet-fed rotary printing press, it makes sense to make said sheet transfer cylinder radially adjustable in order to avoid the risk of smearing as far as possible despite the different material properties of the printing materials used.
In the case of thin, soft substrates, it is necessary to leave as small a gap as possible between the sheet transfer cylinder and the cylinders upstream and downstream of it, so that the paper sheet is well guided and cannot form folds. With cardboard-like substrates, on the other hand, it makes sense to move between the respective cylinders, i.e. H. choose a large distance between their lateral surfaces, since this substrate does not require sheet support due to its inherent stability. A correspondingly large distance then also reduces the risk of greasing.
In this connection, US Pat. No. 1,358,843 is to be mentioned as prior art. The sheet-carrying outer surface there consists of four segments, each of which extends over the width of the sheet transfer cylinder and can be adjusted radially by means of an adjusting mechanism. The adjustment is made for all segments at the same time with a hand lever to be attached to the front. The design effort is relatively high, since in addition to the entire adjusting mechanism, several additional plungers are required as guide means for each segment in order to prevent any transverse movement in the longitudinal direction of the cylinder in addition to the radial movement. Another disadvantage is that the radial adjustment can only be done in stages. Neither is the necessity taken into account to immerse each segment in the sheet transfer cylinder to different depths, since, for example, the end of the paper sheet flutters more than the leading edge of the sheet held by grippers.
Based on this, it is the object of the present invention to provide a sheet transfer cylinder with radially adjustable sheet support segments with which the described disadvantages of the prior art can be eliminated and which allows a centrally operated and stepless radial adjustability of the sheet support segments, the additional possibility should be given to the area assigned to the trailing edge z. B. to be able to adjust radially more than the area assigned to the leading edge of the sheet.
This object is achieved by a sheet transfer cylinder, which is characterized by the features of claim 1.
In addition to the u. a. From the advantages to be derived from the task, the sheet transfer cylinder according to the invention has further favorable properties which can be derived from the following description of the figures and from the subclaims which claim advantageous configurations.
From DD-PS 76 684, a sheet guide cylinder in multicolour sheet-fed rotary printing presses for face or back printing is already known, in which guide segments located on its circumference are arranged such that they can be moved radially and a parallel rocker is provided for the radial movement of the guide segments. The cam-controlled articulated mechanism has a further oscillating parallel crank gear on the oscillating shafts, in order thereby to ensure the forced operation when the cam-controlled circular eccentrics are moved out of their extended position.
Precisely because the radial movement of the guide segments of the sheet transfer cylinder takes place in time with the machine run, this is not suitable for solving the problem on which the present invention is based. In addition, the expenditure on transmission technology is too high.
The present invention is described below using exemplary embodiments. The drawing shows in

1 shows a side view of a sheet transfer cylinder according to the invention with the sheet support segments pivoted out,
2 shows the same sheet transfer cylinder with the sheet support segments pivoted in,
3 shows a further view of the embodiment according to FIGS. 1 and 2,
Fig. 4 shows a sheet transfer cylinder with only radially adjustable sheet support segments in the area of the sheet trailing edge and
FIG. 5 shows the schematic representation of a further embodiment, which, like the embodiment according to FIG. 4, also requires particularly few transmission elements.

1 shows a sheet transfer cylinder 1 with this associated printing cylinders 2, 3 of an upstream or downstream printing unit. In the exemplary embodiment shown, three sheet support segments 5 are provided which are distributed uniformly over the circumference and extend over the length of the sheet transfer extension cylinder 1, each of which can carry a sheet 4.
The gripper bridges 6 each associated with the sheet support segments 5 with grippers 7 and gripper supports 8 acting in the usual way hold each sheet 4 firmly. The gripper bridges 6 are arranged by means of fastening means 9 on corresponding ones on an inner cylinder 10. Web 11 attached. On the end faces 12, 13 (FIG. 3) of the inner cylinder 10, bearing journals 16, 17 are arranged in the side walls 14, 15 of the printing press.
A toothed disk 20, 21 is rotatably mounted on each bearing pin 16, 17 and secured axially by means of a locking ring 22, 23. Into a toothed area 18, 19 of each toothed disc 20, 21, a pinion 24, 25 engages, which is in each case rotatably arranged on an adjusting shaft 26 extending over the length of the sheet transfer cylinder 1, which in turn rotates itself at corresponding bearing points 27-29 of the inner cylinder 10 supports. In the central area of the sheet transfer cylinder 1, a worm wheel 30 is mounted on the actuating shaft 26. A worm 31 engages in this, in the extension of which an adjusting bolt 32 is provided, the upper head end 33 of which can be rotated by means of corresponding working means (eg socket wrench) and which can be locked by means of the locking screw 73. In the exemplary embodiment shown, screw 31 and adjusting bolt 32 are mounted in a holder 34 fastened to one of the three gripper bridges 6.
The prerequisites for a central adjustment of all sheet support segments 5 are thus given.
A coupling rod 39, 40 is articulated at each articulation points 37, 38 of each toothed disk 20, 21, the other articulation point 41, 42 of which is connected to the area of each sheet support segment 5 carrying the trailing edge 4.1 of the bow, as well as to a rocker 43, 44 in Connection is established, which in turn is attached to a frame-fixed articulation point 45, 46, which is located on an extension 47 of the web 11. This gear mechanism is thus designed as an oscillating four-link coupling gear, the drive rocker being determined by the radial distance (from the cylinder center line 72) of the articulation point 37, 38 of the coupling rod 39, 40 on the toothed disk 20, 21.
The area of each sheet support segment 5 which carries the leading edge 4.2 of the sheet has a further articulation point 48, 49 for a further rocker 50, 51 which is rotatably mounted on an extension 52, 53 which is fixed to the frame and is attached to the gripper pad 8. The bearing points described above are formed by appropriately arranged bearing bolts.
It is thus possible to achieve a simultaneous radial pivoting of all three sheet support segments 5 via the central adjustment of the screw 31.
The position of all sheet support segments 5 shown in FIG. 2 can thus be reached. By appropriate selection of the transmission link lengths and the articulation points, the radial adjustment path 60, 61 over the circumferential surface of each sheet support segment 5 differs, namely in the area of the sheet trailing edge 4.1 larger than in the area of the sheet leading edge 4.2.
FIG. 4 shows a further embodiment of a sheet transfer cylinder 62 according to the invention. Only the areas of each of the three sheet support segments 63 carrying the sheet trailing edge 4.1 are radially adjustable. For this purpose, the coupling rod 39, 40 articulated on the toothed disk 20, 21 according to the first embodiment on both end faces 12, 13 of the sheet transfer cylinder 62 is in turn connected to the sheet support segment 63 at the articulation point 37, 38. The area of the sheet support segment 63 which carries the sheet leading edge 4.2 is directly connected at the articulation point 64 to a web 65 of the gripper pad 8 which is fixed to the frame. By turning the toothed disc 20, 21 via the worm wheel drive 30, 31 already described, the sheet support segments 63 can be brought into the position shown in broken lines in FIG. The system is designed as a four-link oscillating coupling gear, the drive rocker in turn being determined by the radial distance (from the cylinder center line 72) of the articulation point 37, 38 of the coupling rod 39, 40 on the toothed disk 20, 21. The output rocker arm is itself formed by the sheet support segments 63.
With the same number of gear links, it is possible with the embodiment shown schematically in FIG. 5 in a particularly advantageous manner, by appropriate selection of the gear link lengths and the articulation points on the sheet support segments 66, these radially both in the area of the sheet leading edge 4.2 and in the area of the sheet trailing edge 4.1 to be adjusted (shown in dash-dot lines), the adjustment paths 60, 61 also being different here. The oscillating four-link coupling gear used on both end faces 12, 13 of the sheet transfer cylinder 67 are each formed by the sheet support segment 66 of the sheet transfer cylinder 67, which represents the paddle, to which the driving pulley 20 and a driven rocker 70 mounted on the articulation point 70 are attached to the articulation points 68, 69 71 attack.
The gear train 20, 21, 24, 25, 30, 31 with a subsequent coupling gear thus allows simultaneous and stepless radial adjustability of the sheet support segments in all embodiments, a rapid adjustment to the respective requirements being possible in a simple manner. The arch transfer cylinder, which is adjustable according to the invention, is therefore characterized by a high degree of flexibility, it being additionally conceivable to take the appropriate precautions (for example, alternatively bores for pivot pins for each articulation point) during its manufacture. This could be different articulation points be placed elsewhere so that the transmission link lengths can be changed, which in turn results in a change in the coupling curves of the individual coupling links, thereby adapting the adjustment range of the radial adjustment of the sheet support segments to the given requirements.
The radial adjustment could, as described above, be carried out manually by a socket wrench or controlled by a motor, hydraulically or pneumatically. The use on other multiple drums (double, quadruple) is also conceivable and is within the scope of the invention.

Parts list

1 sheet transfer cylinder
2 printing cylinders
3 pressure cylinders
4 sheets
4.1 trailing edge of sheet
4.2 Front edge of the sheet
5 sheet support segment
6 gripper bridge
7 grippers
8 gripper pad
9 fasteners
10 inner cylinders
11 bridge
12 end face
13 end face
14 side wall
15 side wall
16 journals
17 journals
18 toothed area
19 toothed area
20 tooth lock washer
21 tooth lock washer
22 circlip
23 circlip
24 sprockets
25 sprockets
26 adjusting shaft
27 depository
28 depository
29 depository
30 worm wheel
31 snail
32 adjusting bolts
33 top headboard
34 bracket
35
36
37 pivot point
38 pivot point
39 coupling rod
40 coupling rod
41 pivot point
42 pivot point
43 swingarm
44 swingarm
45 pivot point
46 pivot point
47 extension
48 pivot point
49 pivot point
50 swingarm
51 swingarm
52 continuation
53 continuation
54
55 56
57
58
59
60 adjustment path
61 adjustment path
62 sheet transfer cylinders
63 sheet support segment
64 pivot point
65 footbridge
66 sheet support segment
67 sheet transfer cylinders
68 articulation point
69 pivot point
70 pivot point
71 output arm
72 cylinder center line
73 locking screw

Claims

1. Sheet transfer cylinder for sheet-fed rotary printing machines having a plurality of sheet-supporting segments (5 ; 65 ; 66) forming the sheet-carrying outer cylindrical surface und extending along the length of said sheet transfer cylinder (1 ; 62 ; 67), said sheet-supporting segments being commonly and essentially radially adjustable by means of a centrally operable adjustment mechanism, characterized in that to each sheet supporting segment (5 ; 63 ; 66) there is respectively assigned, preferably in the region of the two end faces (12, 13) of the sheet transfer cylinder (1 ; 62 ; 67), a swinging linkage gearing (20, 21, 39, 40 ; 43, 44 ; 50, 51 ; 66, 71) having a swinging drive link (20, 21) which engages at the pivot point (37, 38 ; 68, 69) of a linkage member 39, 40 ; 66), and having arranged in front thereof a centrally movable wheel gearing (24, 25, 30, 31) by which said swinging drive link (20, 21) is driven.

2. Sheet transfer cylinder for sheet-fed rotary printing machines according to Claim 1, characterized in that each of the swinging drive links arranged on both sides is constituted of a gear disc (20, 21) mounted on a trunnion (16, 17), whereby the length of every swinging drive link is determined by the radial distance between the pivot point (37, 38, 68, 69) of the afterconnected linkage member (39, 40 ; 66) and the cylinder center line (72).

3. Sheet transfer cylinder according to Claim 2, characterized in that in the toothed zone (18, 19) of each gear disc (20, 21) there engages a pinion (24, 25) which is arranged, so as to be fixed against rotation, on an adjusting shaft (26) extending over the length of said sheet transfer cylinder (1 ; 62; 67) and a worm gear (30) is mounted in the middle region of said adjusting shaft (26) in which engages a worm (31) being turnable by means of adjusting pins (32).

4. Sheet transfer cylinder according to Claim 3, characterized in that the region of each sheet-supporting segment (5 ; 66) assigned to the trailing sheet edge (4.1) is radially more adjustable than that assigned to the sheet front edge (4.2).

5. Sheet transfer cylinder according to Claim 3, characterized in that only the region of each sheet-supporting segment (63) assigned to the trailing sheet edge (4.1) is radially adjustable whereas the region assigned to the sheet front edge (4.2) remains unchanged.

6. Sheet transfer cylinder according to Claim 4, characterized in that at respective, equidistantly arranged pivot points (37, 38) of each gear disc (20, 21) a linking rod (39, 40) is pivoted and its respective other pivot point (41, 42) is in contact with the region of each sheet-supporting segment (5) carrying the trailing sheet edge (4.1) as well as with a swinging link (43, 44), whereas this swinging link, in turn, is fastened at a pivot point (45, 46) which is fixed to an extension (47) of the support part (11) of an inner cylinder (10), and the region of each sheet-supporting segment (5) carrying the sheet front edge (4.2) has a further pivot point (48, 49) for a further swinging link (50, 51) which, respectively, is pivotally mounted on an extension (52, 53) fastened to a gripper bar (6).

7. Sheet transfer cylinder according to Claim 4, characterized in that each sheet-supporting segment (66) of the sheet transfer cylinder (67), by itself, is a component part of the swinging linkage gearing and thus represents the link at which engage, at the pivot points (68, 69), the driving gear disc (20) as well as a swinging drive link (71) being mounted at a pivot point (70) on a stationary support part.

8. Sheet transfer cylinder according to Claim 5, characterized in that at the pivot point (37, 38) of each gear disc (20, 21) a linking rod (39, 40) is pivoted which engages at the region of each sheet-supporting segment (63) carrying the trailing sheet edge (4.1), said sheet-supporting segment (63) representing the swinging drive link of the linkage gearing and being pivoted at a stationary support part (65) in the region of the sheet front edge (4.2).

9. Sheet transfer cylinder according to one or several of the foregoing claims, characterized in that said sheet transfer cylinder (67) has three sheet-supporting segments (5 ; 63 ; 66) equidistantly arranged about its circumference and along its length.