EP0835180B1 - Sheet-fed, offset rotary press - Google Patents

Abstract

The object of the invention is to avoid registration problems in a sheet-fed offset rotary press for high-quality colour printing requiring minimum space. For that purpose the rotary press has two form cylinders (33, 34) and two impression cylinders (21, 22) with in each case at least two printing surfaces (36, 37, 38, 39) that cooperate with a printing cylinder (14) that has one printing surface more than a form cylinder (33, 34), and the sheets (97, 98, 99) are removed from the printing cylinder (14) only after printing is completely finished.

Description

The invention relates to a Sheet offset rotary printing machine according to the Claim 1. A similar printing machine is e.g. from the DE-C-432853 or known from US-A-3384011.

From DE-PS 435 592 is a three-cylinder rotary rubber printing machine known at plate and Rubber cylinder at least two printing surfaces each own and a printing cylinder a printing area more than the rubber cylinder has.

The disadvantage of this printing press is that Registration problems can occur because of a printable Sheet already from a gripper system from the impression cylinder is removed before this sheet is completely printed is.

DE 43 03 797 A1 and FR-A-564 212 show Sheetfed offset printing presses, where a sheet only after a printing process between Rubber cylinder and impression cylinder from one bow-removing gripper system is adopted.

WO 90/02044 describes a rotary printing press with one arranged on a forme cylinder, laser-writable printing plate. The forme cylinder is assigned an axially movable laser writing system.

By GB-A-10 154 A.D. 1915 is one Sheet-fed rotary printing machine for multi-color printing with known a central pressure cylinder. This Printing cylinders are two three each With printing areas Assigned forme cylinders.

EP 0 359 957 A2 shows a printing press with a Short inking unit. The short inking unit essentially exists from a doctor blade, an anilox roller and one Inking roller.

DE-PS 521 874 describes one Sheet-fed rotary printing machine for direct multi-color printing with a forme cylinder and an impression cylinder. Here the forme cylinder has four printing surfaces and the Printing cylinder five gripper systems.

US-A-19 19 462 shows one Sheet-fed rotary printing machine for direct Multi-color printing, with a central printing cylinder five forme cylinders are assigned.

The invention has for its object a To create sheet-fed rotary offset printing press.

This object is achieved by a Sheet-fed rotary printing press with the features of Claim 1 solved.

Advantageously, the sheet-fed offset printing machine according to the invention achieves multi-color printing with a register of the highest accuracy, since the sheets to be printed are held on a printing cylinder in a single gripper system during all printing processes. The printed sheets are only taken over by another gripper system and removed from the printing cylinder after the sheet has been completely printed.
By using a sheet feed device synchronized with the printing cylinder, which accelerates the sheets to be fed from standstill to the peripheral speed of the printing cylinder, a safe sheet feed is achieved with a very precise feed register even at high speeds (e.g. 12,000 sheets per hour).
It is particularly advantageous that laser-writing systems are assigned to the forme cylinders and thus laser-imageable plates are imaged directly in the printing press (computer-to-press). This means that there are no registration problems due to the plate mounting on the forme cylinder or due to errors during the production of the plates. This means that circumferential, side or inclined register setting devices can be dispensed with.
The short inking units without ink zones minimize makeready times and simplify operation of the printing press. In particular, the short inking units enable a very small overall size of the entire printing press. The short inking units are only in contact with one printing surface of the forme cylinder, so that, when parked, they are rolled over only against an anilox roller. An existing color relief in the circumferential direction is reduced by different diameters of applicator roller and anilox roller.
The anilox roller interacts with a chambered doctor blade, which completely removes the remains of the ink relief and creates a completely even ink film on the anilox roller.
Damping units are not required when using plates suitable for dry offset, so that known problems caused by dampening solutions, such as, for example, emulsification or increased stenciling, cannot arise.
The investment pile and delivery pile are on one side, which improves usability. In addition, the side to be printed of the sheets to be fed is at the bottom, while the printed side is at the top of the discharged sheets of the delivery stack. As a result, it is not necessary to turn the stacks after the straight printing in order to reprint the sheets.

The sheet-fed offset printing press according to the invention is compact, minimizes set-up times, simplifies Operation and still guarantees multi-colored, stencil-free quality prints with excellent Passer. This makes it suitable Sheetfed offset rotary press especially for small ones Print runs in a range from 100 to 20,000 sheets.

In addition, at least double coloring of the Ink application roller achieved in that the circumferential length the printing area to be inked is less than or equal to one Circumferential length of the assigned inking roller is.

The sheet-fed offset printing press according to the invention is shown in the drawing and is described below described in more detail.

Fig. 1

eine schematische Seitenansicht der Bogenoffsetrotationsdruckmaschine;

Fig. 2

eine schematische Darstellung eines Nockengetriebes zur Steuerung von Farbauftragwalzen.

Show it

Fig. 1

a schematic side view of the sheet offset rotary printing press;

Fig. 2

is a schematic representation of a cam gear for controlling inking rollers.

A scale feeder 1 is connected upstream of a sheet line 2 of a sheet offset rotary printing press. This sheet system 2 is mounted in side frames 3, 4 of the sheet offset rotary printing press and essentially consists of a side aligning device, for example a suction draw mark 6, a sheet feed device 7 and front marks 8, 9.
For example, the sheet feed device 7 is designed as a rotating stop drum 7, which is provided on the circumference with two gripper systems 12, 13 which are offset by 180 ° and extend in the direction of an axis of rotation 11 of the stop drum 7. A row, ie at least two, front marks 8, 9 are arranged in the area of these gripper systems 12, 13. The stop drum 7 is driven, for example, synchronized to the machine cycle by means of an electric drive (not shown), which accelerates the stop drum 7 from standstill to the peripheral speed of a printing cylinder 14 within 180 ° and then brakes it again to a standstill. The sheet feed device 7 can also be designed as a vibrator or suction drum or can also work in several stages from combinations of the suction drum and stop drum or vibrator and is arranged below the sheet to be fed.

The central pressure cylinder 14 with a diameter d14, z. B. d14 = 396 mm, which corresponds to a triple nominal diameter dn = 132 mm, is provided with three gripper systems 17, 18, 19, each offset by 120 ° and extending parallel to its axis of rotation 16. These controllable gripper systems 17, 18, 19, which interact with gripper supports 103, 104, 106, are actuated to open and close by means of cam rollers which interact with variable control cams.
With this pressure cylinder 14 act two double nominal diameter dn rubber cylinders 21, 22 with a diameter d21 and d22, z. B. d21 = 264 mm or d22 = 264 mm together, which each have two equal, opposite pressure surfaces 23, 24 and 26, 27. The respective rubber cylinder 21, 22 can be covered with two rubber blankets 28, 29 or 31, 32 corresponding to the assigned printing surfaces 23, 24 or 26, 27 or with a single rubber blanket corresponding to the two printing surfaces 23, 24 or 26, 27 will.
Corresponding forme cylinders 33, 34 are assigned to these rubber cylinders 21, 22. The double-sized forme cylinders 33, 34 with a diameter d33 or d34, z. B. d33 = 264 mm or d34 = 264 mm, also have two pressure surfaces 36, 37 or 38, 39 assigned to the pressure surfaces 23, 24 or 26, 27 of the rubber cylinders 21, 22. These pressure surfaces 36, 37 and 38, 39 are formed, for example, by printing plate plates 41, 42 and 43, 44, each of these pressure surfaces 36, 37 and 38, 39 of the forme cylinders 33, 34 having its own plate 41, 42 and 43, 44 or both printing surfaces 36, 37 or 38, 39 can be provided with a common plate which then carries two printing forms. Special plates 41, 42, 43, 44 suitable for waterless offset printing are preferably used, so that dampening units can be dispensed with. The sheet offset rotary machine described works with planographic printing plates. But it is also possible to use high pressure plates (letterset). Each forme cylinder 33, 34 is assigned its own laser writing system 46, 47 for direct imaging of suitable plates 41, 42, 43, 44. These plates 41, 42, 43, 44 are located on the forme cylinders 33, 34 before the imaging and can be fed to the forme cylinders 33, 34 individually. However, it is also possible to provide the forme cylinder 33, 34 with a cavity and to arrange a supply and holding spindle of a laser-inscribable film there.
Rubber and forme cylinders 21, 22 and 33, 34 can each be equipped with more than two printing surfaces, the printing cylinder 14 then z. B. a gripper system carries more or less than the number of printing surfaces of a forme cylinder 33, 34. The number of gripper systems 17, 18, 19 of the printing cylinder 14 is not equal to the number of printing surfaces 36, 37 of the forme cylinder 33.
In the exemplary embodiment, the two laser writing systems 46, 47 are mounted together on a traverse 48 which extends parallel to the axis of rotation 16 of the printing cylinder 14. For example, a large number of independent laser diodes are located at a fixed location and are each connected to one end of an optical fiber. The other ends of the light guides are arranged close to one another on a slide, a large number (for example 64) of the light guides being aligned with each forme cylinder 33, 34. The carriage can be moved axially parallel to the longitudinal direction of the forme cylinders 33, 34 on the crossmember 48. The two forme cylinders 33, 34 can thus be imaged at the same time. It is also possible to dispense with the axially displaceable carriage and to arrange the light guides in a stationary manner, aligned with the respective forme cylinders 33, 34, in which case a number of light guides corresponding to the desired resolution of the printed image is provided over an entire length of the forme cylinders 33, 34.
A single imaging system can also be arranged, which can optionally be assigned to both forme cylinders 33, 34, for example by means of a swiveling device, or whose rays are deflected such that both forme cylinders 33, 34 can be imaged.

Each of the printing surfaces 36, 37, 38, 39 of the two forme cylinders 33, 34 is inked by its own inking unit 49, 51, 52, 53. For this purpose, the inking units 49, 51, 52, 53 can be alternately turned on and off on the forme cylinders 33, 34, so that only the associated printing surface 36, 37, 38, 39 is inked. These inking units 49, 51, 52, 53, which are designed as short inking units, essentially each consist of an inking roller 54, 56, 57, 58 that colors the printing surface 36, 37, 38, 39, a driven anilox roller 59, 61, 62, 63 a chambered doctor blade 64, 66, 67, 68 and a collecting trough 69. The respective inking roller 54, 56, 57, 58 can also be designed to be driven, a drive shared with the anilox roller 59, 61, 62, 63 or its own independent, for example controllable, drive being provided can. A diameter d54, d56, d57, d58, e.g. B. = 123 mm, the inking rollers 54, 56, 57, 58 is of a diameter d59, d61, d62, d63, z. B. = 117 mm, the anilox rollers 59, 61, 62, 63 different. Thus, a circumferential length of the printing surface 36, 37, 38, 39 to be inked is less than or equal to the circumferential length of the associated inking roller 54, 56, 57, 58. The chamber doctor blade 64, 66, 67, 68, which has a working and closing doctor blade 71, 72, leads the Anilox roller 59, 61, 62, 63 printing ink, which is metered by means of the doctor blade 71.
Excess printing ink scraped off by the anilox roller 59, 61, 62, 63 by means of the respective closing doctor blade 72 is taken up by the collecting trough 69 and fed back to an ink circuit. Anilox roller 59, 61, 62, 63 and rubberized inking roller 54, 56, 57, 58 are in constant contact with one another, while the inking roller 54, 56, 57, 58 synchronizes with the respective forme cylinder 33, 34 on the associated printing surface 36, 37, 38 , 39 is adjustable. For this purpose, the inking roller 54, 56, 57, 58 is mounted on both sides in single-arm levers 72, 73, 74, 76 which can be pivoted about the anilox roller 59, 61, 62, 63. These levers 72, 73, 74, 76 can be mechanically, e.g. B. by means of a cam gear, or electrically, for. B. by means of a pressurizable working cylinder 78, 79, 81, 82 cooperating solenoid valve.
Their inking rollers are in constant contact with the other inking rollers of the conventional inking unit and, from the respective forme cylinders 33, 34, only ink the respective assigned printing surface 36, 37, 38, 39, and can be switched on and off.
In the direction of production, a sprocket shaft 84 having sprockets 83 is arranged after the two rubber cylinders 21, 22 and cooperates with the pressure cylinder 14. A length l, e.g. B. 414 mm, one of two centers 85, 90 of the blanket cylinder 22 and impression cylinder 14 or sprocket shaft 84 and impression cylinder 14 limited circular arc 95 on the outer surface of the impression cylinder 14 is greater than a length, for. B. 360 mm, the sheet at the maximum format allowed for this machine. An angle alpha enclosed by the center 90 of the impression cylinder 14 and the sprocket shaft 84 and by the center 100 of the impression cylinder 14 and the stop drum 7, e.g. 8. Alpha = 60 °, is smaller than an angle Beta, e.g. B. Beta = 120 °, which is formed by two successive gripper systems 17, 18. The sprocket shaft 84 guides a chain 86 of a chain gripper arm 87. B. four chain gripper systems 88, 89, 91, 92 equipped, a distance a, z. B. 829 mm, two chain gripper systems 88, 89, 91, 92 to each other with a stretched chain 86 corresponds to a circumferential length of a rubber or plate cylinder 21, 22 or 33, 34.
This endless chain 86 designed in this way is deflected by a second sprocket shaft 93 and runs back to the pressure cylinder 14. This distance a can also be made smaller if the chain is non-uniform, for. B. slowed to the sheet deposit, rotates.

The sheetfed offset printing machine according to the invention works as follows:
The scale feeder 1 separates sheets from a stack 94 and feeds them via a suction belt table 96 to the stationary stop drum 7. There, a front edge of a first sheet 97 applied is aligned on the front marks 8 parallel to the axis of rotation 11 of the stop drum 7. Then the suction mark 6 detects the sheet 97 and aligns it laterally. After aligning the sheet 97, the gripper system 12 closes the stop drum 7 and the stop drum 7 accelerates the sheet 97 from standstill to the circumferential speed of the printing cylinder 14. After reaching the circumferential speed, the gripper system 12 of the stop drum 7 transfers the sheet 97 to the first gripper system 17 Printing cylinder 14. This conveys the sheet 97 to the first blanket cylinder 21 and the sheet 97 is printed by the printing surface 23 of the blanket cylinder 21. Before that, the plate 41 of the forme cylinder 33 inked by the inking unit 49, for example with black printing ink, has transferred its printed image to the printing surface 23 of the blanket cylinder 21. The sheet 97 thus provided with a first printed image and the sheet 97 held by the gripper system 17 are transported to the second rubber cylinder 22. There, the sheet 97 is printed with the second printing image from the printing surface 26 previously provided by the inking unit 52 and the plate 43 of the second forme cylinder 34 with a second printing image (for example in the printing ink “cyan”).
Meanwhile, the second gripper system 18 of the printing cylinder 14 passed the stop drum 7 without picking up a sheet.
The third gripper system 19 now takes over a second sheet 98 from the second gripper system 13 of the stop drum 7, which was fed and aligned in the same way as the first sheet 97 of the stop drum 7. This sheet 98 is also printed first by the printing surface 23 of the first blanket cylinder 21 bearing the printed image of the plate 41 and then by the printing surface 26 of the second blanket cylinder 22 bearing the printed image of the plate 43.
In the meantime, the first sheet 97 was conveyed past the sprocket shaft 84 and the stop drum 7 without opening the gripper system 17.
The sheet 97 now reaches the rubber cylinders 21 and 22 for the second time. However, on the first rubber cylinder 21, the sheet 97 is now printed by the second printing surface 24 with the third printing image, which is colored by the inking unit 51, for example with the printing ink "magenta" Plate 42 was transferred to the printing surface 24. The fourth printed image was transferred from the plate 44 inked, for example, with yellow printing ink by means of the inking unit 53 to the second printing surface 27 of the second blanket cylinder 22. This printing surface 44 prints the sheet 97 with the fourth print image.
The second gripper system 18 in the meantime took over a third, sheet 99, from the first gripper system 12 of the stop drum 7, which, like the first and second sheets 97, 98, is now being printed for the first time by the printing surfaces 23 and 26 of the rubber cylinders 21 and 22, respectively.
The completely printed, provided with four printed images first sheet 97 is after the end of the fourth printing process even at maximum format length, z. B. 360 mm, taken from the chain gripper system 91 in the area of the sprocket shaft 84. Here, the gripper system 17 opens for the first time after the unprinted sheet 97 has been taken over from the first gripper system 12 of the stop drum 7, the sheet 97 has thus been printed with four printed images in a gripper closure. This chain gripper system 91 transports the sheet 97 in the chain gripper arm 87 to the area of a stack 101. There the chain gripper system 91 opens and the sheet 97 is placed on the stack 101.
The now empty gripper system 17 then takes over a fourth sheet 102 from the gripper system 12 of the stop drum 7.
The second gripper system 18 transports the third sheet 99 printed with two printed images past the sprocket shaft 84, while the second sheet 98, which has now been provided with four printed images, is transferred to the chain gripper system 92 and transported to the stack 101.
These described processes are repeated periodically, so that each revolution of the forme cylinders 33, 34 and the rubber cylinders 21, 22, respectively, one sheet printed with four printed images reaches the chain gripper arm 87 and is deposited there on the stack 101.

The aforementioned cam gear 75 for the start and Parking the inking rollers 54, 56, 57, 58 can on each page, for example, essentially from a pair of cams 106, 107 and two with these cooperating cam rollers 108, 109 exist and are exemplified using a cam gear 75 of the forme cylinder 33 described. The cams 106, 107 are rigid on a pin 111 of the respective associated forme cylinder 33 attached and run with this around. An outer surface of each cam 106, 107 is in the circumferential direction with an arcuate, adapted to the associated printing surface 36, 37 Recess 112, 113 and an opposite, arcuate elevation 114, 116 which means more gently, in the area of a channel of the forme cylinder 33 horizontal transition curves are connected. The Cam rollers 108, 109 are for example on one Pins 117 and 118 of the inking roller 54 and 56 rotatably mounted. The cam rollers 108, 109 both with a forme cylinder 33 spring cooperating Ink application rollers 54, 56 are in the axial direction offset from one another so that each cam roller 108, 109 a cam plate 106, 107 is assigned. Through the Rotation of the cam disks 106, 107 with the Forme cylinder 33 acts alternately with elevation 114, 116 and the recess 112, 113 of the respective cam 106, 107 together in such a way that during the Interaction of the recess 112, 113 with the Cam roller 108, 109 starting and during the Interaction of the increase 114, 116 with the Cam roller 108, 109 lifting the inking roller 54, 56 from the forme cylinder 33.

Reference list

1

Scale feeder

2nd

Bow system

3rd

Side frame

4th

Rare frame

5

-

6

Suction draw mark

7

Sheet feeding device, stop drum

8th

Front mark

9

Front mark

10th

-

11

Axis of rotation (7)

12th

Gripper system (7)

13

Gripper system (7)

14

Impression cylinder

15

-

16

Axis of rotation

17th

Gripper system (14)

18th

Grid system (14)

19th

Gripper system (14)

20th

-

21

Rubber cylinder

22

Rubber cylinder

23

Printing area (21)

24th

Printing area (21)

25th

-

26

Printing area (22)

27

Printing area (22)

28

Rubber blanket (21)

29

Rubber blanket (21)

30th

-

31

Rubber blanket (22)

32

Rubber blanket (22)

33

Forme cylinder

34

Forme cylinder

35

-

36

Printing area (33)

37

Printing area (33)

38

Printing area (34)

39

Printing area (34)

40

-

41

plate (33)

42

Plate (33)

43

Plate (34)

44

Plate (34)

45

-

46

Laser writing system

47

Laser writing system

48

traverse

49

Inking unit

50

-

51

Inking unit

52

Inking unit

53

Inking unit

54

Inking roller

55

-

56

Inking roller

57

Inking roller

58

Inking roller

59

Anilox roller

60

-

61

Anilox roller

62

Anilox roller

63

Anilox roller

64

Chamber squeegee

65

-

66

Chamber squeegee

67

Chamber squeegee

68

Chamber squeegee

69

Drip pan

70

-

71

Working doctor blade

72

Closing doctor blade

73

lever

74

lever

75

Cam gear

76

lever

77

lever

78

Working cylinder

79

Working cylinder

80

-

81

Working cylinder

82

Working cylinder

83

Sprocket

84

Sprocket shaft

85

Head office (22; 14)

86

Chain

87

Chain grab arm

88

Chain gripper system

89

Chain gripper system

90

Head Office (84; 94)

91

Chain gripper system

92

Chain gripper system

93

Sprocket shaft, second

94

Stack (1)

95

Circular arc (14)

96

Suction belt table

97

Bow, first

98

Bow, second

99

Bow, third

100

Head Office (7; 14)

101

Stack (87)

102

Bow, fourth

103

Gripper pad (14)

104

Gripper pad (14)

105

Gripper pad (14)

106

Cam (75)

107

Cam (75)

108

Cam roller (75)

109

Cam roller (75)

110

-

111

Cones (33)

112

Recess (106)

113

Recess (107)

114

Elevation (106)

115

-

116

increase (107)

117

thong (54)

118

Cone (56)

a

Distance between chain gripper systems (88; 89; 91; 92)

d14

Diameter of the impression cylinder (14)

d21

Rubber cylinder diameter (21)

d22

Rubber cylinder diameter (22)

d33

Diameter of the forme cylinder (33)

d34

Diameter of the forme cylinder (34)

d54

Ink roller diameter (54)

d56

Ink roller diameter (56)

d57

Ink roller diameter (57)

d58

Ink roller diameter (58)

d59

Anilox roller diameter (59)

d61

Anilox roller diameter (61)

d62

Anilox roller diameter (62)

d63

Anilox roller diameter (63)

l

Length of the arc (95)

alpha

Angle between the centers (90; 100)

beta

Angle between two gripper systems (17; 18)

Claims (15)

1. Sheet-fed offset rotary printing machine for multi-colour printing, consisting of a forme cylinder (33), a blanket cylinder (21) and a central impression cylinder (14) provided with a plurality of controlled gripper systems (17; 18; 19), the forme cylinder (33) and blanket cylinder (21) having identical diameters (d33 and d21) and in each case at least two printing surfaces (23; 24 and 36; 37), and a number of gripper systems (17; 18; 19) of the impression cylinder (14) being unequal to the number of printing surfaces (36; 37) of the forme cylinder (33), the impression cylinder (14) being assigned at least one second pair of cylinders consisting of a forme cylinder (34) and blanket cylinder (22), and that [sic] each printing surface (36; 37; 38; 39) is assigned at least one short inking unit (49; 51; 52; 53), that [sic] the short inking unit (49; 51; 52; 53) in each case has an engraved roller (61; 62; 63; 64), a closed metering unit (64; 66; 67; 68) and at least one ink applicator roller (54; 56; 57; 58).
2. Sheet-fed offset rotary printing machine according to Claim 1, characterized in that laser-inscribable plates (41; 42; 43; 44) are arranged on the forme cylinder (33; 34).
3. Sheet-fed offset rotary printing machine according to Claims 1 and 2, characterized in that each forme cylinder (33; 34) is assigned its own laser inscribing system (46,; 47).
4. Sheet-fed offset rotary printing machine according to Claims 1 and 2, characterized in that a single laser inscribing system (46; 47) for the selective imaging of both form cylinders (33; 34) is provided.
5. Sheet-fed offset rotary printing machine according to Claims 1 to 4, characterized in that the laser inscribing system (46; 47) is arranged so as to be axially movable parallel to its associated forme cylinder (33; 34).
6. Sheet-fed offset rotary printing machine according to Claims 1 to 4, characterized in that the laser inscribing system (46; 47) is arranged at a fixed location in the axial direction and is provided with a multiplicity of lasers such that the respective associated forme cylinder (33; 34) is simultaneously imaged along its entire length.
7. Sheet-fed offset rotary printing machine according to Claim 1, characterized in that the central impression cylinder (14) is assigned a sheet supply device (7), in that this sheet supply device (7) can be driven in such a way that a sheet (97; 98; 99; 102) is supplied only to every second controllable gripper system (17; 18; 19) of the impression cylinder (14) and the sheets (97; 98; 99; 102) to be supplied are accelerated from standstill in a single-stage or multistage manner to the circumferential speed of the impression cylinder (14).
8. Sheet-fed offset rotary printing machine according to Claim 7, characterized in that this sheet supply device (7) is designed as a stop drum (7).
9. Sheet-fed offset rotary printing machine according to Claim 8, characterized in that the stop drum (7) is provided on the circumference with two gripper systems (12; 13) offset at 180°.
10. Sheet-fed offset rotary printing machine according to Claim 7, characterized in that a specific electric drive is provided for driving this sheet supply device (7).
11. Sheet-fed offset rotary printing machine according to Claim 1, in that the impression cylinder (14) is assigned a sheet-discharging gripper system (88; 89; 91; 92), in such a way that a sheet (97; 98; 99) having the maximum format length is taken over by this gripper system (88; 89; 91; 92) only after the termination of a printing operation between the blanket cylinder (22) and impression cylinder (14) .
12. Sheet-fed offset rotary printing machine according to Claim 1, characterized in that the ink applicator roller (54; 56; 57; 58) is arranged in constant contact with the associated engraved roller (61; 62; 63; 64) and so as to be capable of being alternately thrown onto and off the forme cylinder (33; 34), so as to ink only the respective associated printing surface (36; 37; 38; 39).
13. Sheet-fed offset rotary printing machine according to Claim 1, characterized in that the short inking unit has only a single ink applicator roller (54; 56; 57; 58).
14. Sheet-fed offset rotary printing machine according to Claim 13, characterized in that this ink applicator roller (54; 56; 57; 58) is arranged so as to cooperate directly with the engraved roller (59; 61; 62; 63) and with the associated printing surface (36; 37; 38; 39).
15. Sheet-fed offset rotary printing machine according to Claim 1, characterized in that the respective ink applicator roller (54; 56; 57; 58) is arranged so as to be mounted in levers (73; 74; 76; 77) pivotable about the associated engraved roller (61; 62; 63; 64).

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