HK1026871B - Print unit - Google Patents

Description

Printing device

The present invention relates to a printing apparatus.

A rotary offset printing press with a blanket cylinder and a plate cylinder is known from EP0644048a 2. The blanket and plate cylinders are coupled in pairs by a mechanical coupling into cylinder groups for common driving thereof. Such roller sets are driven by their own drive motors, respectively.

DE4430693a1 discloses a printing unit on a rotary offset printing press, in which at least one cylinder is driven individually, while the associated plate cylinder and blanket cylinder are driven in combination.

EP0812683a1, which is published subsequently, describes a sheet-fed rotary printing press in which each printing unit has a plate cylinder, a blanket cylinder and an impression cylinder. Each plate cylinder of the printing couple has its own drive motor.

The aim of the invention is to provide a printing device.

According to a first aspect of the present invention, there is provided a printing unit for an offset printing press comprising at least two plate cylinders and at least two transfer cylinders, where each plate cylinder is driven individually by a suitable drive motor, characterised in that at least two transfer cylinders are coupled together for driving and have their own drive motors.

According to another aspect of the present invention, there is provided a printing apparatus of an offset printing press, which includes a plate cylinder, a transfer cylinder, and an impression cylinder, respectively, where the plate cylinder is driven by a drive motor alone, characterized in that: the mating transfer and impression cylinders are coupled together for driving to print the paper and are driven by the same drive motor, which is independent of the plate cylinder.

In a preferred embodiment, the printing apparatus of the present invention eliminates a mechanism for performing circumferential register adjustment. If the circumferential positioning of the plate cylinders is adjusted by means of separate drives, the relative rotational angles of the blanket cylinders are kept the same by changing the phase of the plate cylinders relative to one another. The flutes of the blanket cylinders remain in the same position relative to each other. Although the position of the plate cylinder's grooves varies relative to the grooves of the blanket cylinder, the grooves of the plate cylinder do not extend beyond the groove area of the blanket cylinder because the grooves (i.e., the non-print areas) of the plate cylinder are generally smaller than the grooves of the blanket cylinder. Therefore, even in the case of the circumferential register adjustment, the printing area is not reduced by the groove of the blanket cylinder. The expenditure on the electric equipment is considerably reduced compared to printing units whose cylinders each have their own separate drive.

In particular, for quick change printing plates ("printers"), each plate cylinder of the printing unit can be selectively stopped when the sheet leaves the associated blanket and impression cylinders.

Embodiments of the invention are illustrated in the drawings and will be described in detail below. Wherein:

FIG. 1 is a schematic top view of a printing apparatus in a first embodiment;

FIG. 2 is a schematic side view of a printing unit in a first embodiment;

FIG. 3 is a schematic side view of a printing unit in a second embodiment;

FIG. 4 is a schematic side view of a printing unit in a third embodiment;

FIG. 5 is a schematic side view of a printing unit in a fourth embodiment;

FIG. 6 is a schematic side view of a printing unit in a fifth embodiment;

fig. 7 is a schematic top view of a printing apparatus in a sixth embodiment.

In the first embodiment (fig. 1; fig. 2) a printing unit 1 of an offset rotary printing press of the so-called bridge type construction is described. The printing unit 1 is essentially formed by two pairs of plate and blanket cylinders 2, 3, 4, 6, for example plate and blanket cylinders 2, 3, 4, 6, which interact in pairs. The two blanket cylinders 4, 6 form a printing point 7 in their contact area, where a material web 8, for example a paper 8, is printed. The plate and blanket cylinders 2, 3, 4, 6 are provided at both ends with journals 9, 11-14, 16-18, which are arranged in side frames 19, 21 of the offset rotary printing press. The plate and blanket cylinders 2, 3, 4, 6 are arranged to be adjustable in on-and off-pressure in a known manner, for example by means of eccentric bushings. For example, the blanket cylinders 4, 6 can be arranged so as to be adjustable in and out with respect to the associated plate cylinders 2, 3. On the drive side of the printing unit 1, the journals 9, 12, 14, 17 of the plate and blanket cylinders 2, 3, 4, 6 pass through a lateral frame 19. The journals 14, 17 of the two blanket cylinders 4, 6 are provided with interacting gear wheels 22, 23. The two blanket cylinders 4, 6 are driven by the same drive 24, for example by a positioning motor 24. The rotor of the electric motor 24 is mounted directly on the blanket cylinder 6, for example by means of a coupling, i.e. without a transmission ratio, but the drive 24 can also be mounted directly or indirectly on either blanket cylinder 4, 6, for example by means of a linkage (gear or belt). The two forme cylinders 2, 3 are each provided with their own drive 26, 27, for example positioning motors 26, 27. The drive of the respective forme cylinder 2, 3 can also be mounted directly or via a linkage. The drive 24 of the blanket cylinders 4, 6 and the drive 26, 27 of the plate cylinders 2, 3 are synchronized with each other.

It is also possible to press a third pair of plate and blanket cylinders against one of the two blanket cylinders 4, 6. At this time, the third blanket cylinder forms a second printing dot with the second or first blanket cylinder. The third blanket cylinder is also provided with a gear which meshes with, for example, the gear of the interacting blanket cylinder. The third blanket cylinder is mechanically, e.g., reasonably shaped, coupled to the first and second blanket cylinders. The third forme cylinder is furthermore provided with its own positioning motor and is driven separately.

In a second embodiment, a printing device 28 is described, which is referred to as an H-structure. In this printing apparatus 28, four pairs of plate and blanket cylinders 29, 34 are provided; 31. 36; 32. 37; 33. 38, wherein two blanket cylinders 34, 36 or 37, 38 are arranged to be pressed together, respectively, for printing on the sheet 8. The two interacting blanket cylinders 34, 36 or 37, 38 are coupled to and driven by a drive motor 39, 41, respectively. However, it is also possible to couple all four blanket cylinders 34, 36, 37, 38 and to drive the four coupled blanket cylinders 34, 36, 37, 38 by means of the same drive motor.

Each plate cylinder 29, 31, 32, 33 has its own drive motor 42, 43, 44, 46 independent of blanket cylinders 34, 36, 37, 38.

In the third embodiment, a printing device 47 called a 9-satellite is described. In this printing apparatus 47, four pairs of plate and blanket cylinders 48, 53; 49. 54, a first electrode; 51. 56; 52. 57 interact in pairs with a satellite cylinder 58 acting as impression cylinder 58. Here, at least two blanket cylinders, preferably all blanket cylinders 53, 54; 56. 57 are all coupled to each other and driven by the same drive motor 59. It is also possible to combine the blanket cylinders into any desired group and to drive each group by its own drive motor (for example, with one drive motor for each two groups of two blanket cylinders 53, 54; 56, 57).

In this embodiment, the satellite cylinders 58 have their own drive motors 61, but may be coupled to a set of blanket cylinders. In a 9-satellite printing apparatus, it is preferred that all blanket cylinders 53, 54, 56, 57 and satellite cylinder 58 be coupled together and driven by the same drive motor. In this case, the drive motor first acts on the satellite drum 58, and the blanket drums 53, 54, 56, 57 are driven again by the satellite drum 58. Here, each plate cylinder 48, 49, 51, 52 has its own drive motor 62, 63, 64, 66 independent of blanket cylinders 53, 54, 56, 57.

In the fourth embodiment, a printing device 67 called a 10-satellite is described. This printing device 67 is arranged in an axisymmetric manner with respect to the vertical plane and has two satellite cylinders 68, 69 which function as impression cylinders 68, 69. The two impression cylinders 68, 69 are equipped with two pairs of plate and blanket cylinders 71, 73, respectively; 72. 74 or 76, 78; 77. 79. In this case, two blanket cylinders 73, 74 or 78, 79 are coupled with the associated impression cylinder 68 or 69, respectively, and are driven by drive motors 81, 82, respectively. Each associated plate cylinder 71, 72 or 76, 77 has its own drive motor 83, 84 or 86, 87. However, it is also possible to provide each impression cylinder 68, 69 with its own drive motor without coupling to the associated blanket cylinder 73, 74 or 78, 79. In this case, the two associated blanket cylinders 73, 74 or 78, 79 are coupled and have their own drive motors which are independent of both the plate cylinders 71, 72 or 76, 77 and of the impression cylinders 68, 69.

Common to all embodiments is that the plate cylinders 2, 3; 29. 31, 32, 33; 48. 49, 51, 52; 71. 72; 76. 77 each have their own drive motor 26, 27; 42. 43, 44, 46; 62. 63, 64, 66; 83. 84; 86. 87 and the printing device 1; 28; 47; 67 at least two blanket cylinders 4, 6; 34. 36; 37. 38; 53. 54, 56, 57; 73. 74; 78. 79 are coupled together and have their own independent plate cylinders 2, 3; 29. 31, 32, 33; 48. 49, 51, 52; 71. 72; 76. 77 of the drive motor 24; 39. 41; 59; 61; 81; 82.

for holding the blanket cylinders 4, 6; 34. 36; 37. 38; 53. 54, 56, 57; 73. 74; 78. 79 or impression cylinders 58, 68, 69 are mechanically coupled, it being possible to provide other transmission means, for example belts, instead of a gear transmission. For the common drive, the blanket cylinders 4, 6 are preferably realized by means of a form-appropriate drive connection via gears or toothed belts; 34. 36; 37. 38; 53. 54, 56, 57; 73. 74; 78. 79 or impression cylinders 58, 68, 69.

In the fifth exemplary embodiment, a printing couple 88 is described, which is composed of a plate cylinder, blanket cylinder and impression cylinder 89, 91, 92. The plate cylinder 89 is driven individually by a drive motor 93, and the blanket and impression cylinders 92 are coupled together for driving and driven by the same drive motor 94. The transmission of the blanket and impression cylinders 91, 92 is independent of the transmission of the plate cylinder 89.

In the sixth embodiment, a modification of the fourth embodiment is described. On the plate cylinder 71; a journal 96 of 72; 97 are respectively rotatably mounted with a gear 98; 99. by means of a clutchable coupling 101; 102, preferably a one-way clutch, the gear 98; 99 can be selectively coupled to journal 96; 97 to achieve a rotationally fixed connection. The gear 98; 99 and a blanket cylinder 73; 74 journal 103; 104 rotating a fixedly connected gear 106; 107 are engaged together. On the blanket cylinder 73; journal 103 of 74; 104 rotatably mounting a second gear 108; 109. by means of a coupling 111 which can be coupled; 112, the gear 108; 109 may be selectively connected to the blanket cylinder 73; journal 103 of 74; 104 achieve a rotationally fixed connection. Two blanket cylinders 73; 74, the gears 108; 109 mesh with the gear 113 of the impression cylinder 68. This gear wheel 113 is connected in a rotationally fixed manner to a journal 114 of the impression cylinder 68. The brakes 116, 117 may be associated with two blanket cylinders 73; 74, for example a brake may be arranged on the blanket cylinder 73; 74 on the second journal 118, 119.

In a first mode of operation, blanket cylinder 73; the coupling 111 of 74; 112 are engaged, and thus the gears 108; 109 and journal 103; 104 are rotationally fixedly connected, and a blanket cylinder 108; 109 is driven by the motor 81 of the platen roller 68. A plate cylinder 71; 72, coupling 101; 102 are in the off state, and therefore, on plate cylinder 71; gears 98 on journals 96, 97 of 72; 99 may be idle. A plate cylinder 71; 72 is driven by a motor 83; 84 are driven. In the second operating mode, for example, the plate cylinder 71 can be stopped for changing printing plates. The associated blanket cylinder 73 can also be stopped by disengaging the coupling 111 and engaging the brake 116. In the "non-printing" position, plate cylinder 71 can only be rotated by motor 83 while blanket cylinder 73 is at rest. In a third mode of operation, plate cylinder 71 and blanket cylinder 73 are coupled to each other and can be rotated together by motor 83 independently of impression cylinder 68 in the "non-printing" position. In this case, the coupler 101 of the plate cylinder 71 is in the engaged state, and the coupler 111 of the mating blanket cylinder 73 is in the disengaged state.

The drum is preferably driven by means of a positioning motor, for example an ac motor. The rotor of the drive motor may be mounted directly on the journal of the drum, but it may also be indirectly connected to the journal of the drum through a linkage (e.g., gears or belts).

During printing, the driving of the plate cylinder is done by its own drive motor, which is independent of the mating transfer cylinder, i.e. not shape-wise coupled together.

Can be moved by means of the plate cylinders 2, 3; 29. 31, 33, 32; 48. 49, 51, 52; 71. 72; 76. 77; 89 of the drive motors 26, 27; 42. 43, 46, 44; 62. 63, 64, 66; 83. 84; 86. 87; 93 pairs are plate cylinders 2, 3; 29. 31, 33, 32; 48. 49, 51, 52; 71. 72; 76. 77; 89 are driven, for example, by means of a gear or belt drive or by means of one or more drive motors of their own.

In all embodiments, the printing unit is arranged in a web-fed rotary printing press for printing sheets.

Referring to legend 1, printing device 2, plate cylinder (1), 3, plate cylinder (1), 4 blanket cylinder, transfer cylinders (1), 5-6 blanket cylinder, transfer cylinder (1), 7, printing dots 8, paper 9 journal (2), 10-11 journal (2), 12 journal (3), 13 journal (3), 14 journal (4), 15-16 journal (4), 17 journal (6), 18 journal (6), 19 side bed 20-21 side bed 22, gear (4), 23, 24, drive motor (4, 6), 25-26, drive motor (2), 27, drive motor (3), printing device 29, plate cylinder (28), 30-31, plate cylinder (28), 32 cylinder (28), 33, 34 blanket cylinder (28), 35-36 blanket cylinder (28), 37 cylinder (28), 38 blanket cylinder (28), 39 blanket cylinder (28) Motors (34, 36) 40-41 drive motors (37, 38)42 drive motor (29)43 drive motor (31)44 drive motor (32) 45-46-47 printing device 48 plate cylinder (47)49 plate cylinder (47) 50-51 plate cylinder (47)52 plate cylinder (47)53 blanket cylinder (47)54 blanket cylinder (47) 55-56 blanket cylinder (47)57 blanket cylinder (47)58 impression cylinder (47)59 drive motor (53, 54, 56, 57) 60-61 drive motor (58)62 drive motor (48)63 drive motor (49)64 drive motor (51) 65-66 drive motor (52)67 printing device 68 impression cylinder (67)69 impression cylinder (67) 70-71 cylinder (67)72 plate cylinder (67)73 blanket cylinder (67)74 Blanket cylinders (67) 75-76 plate cylinders (67)77 plate cylinders (67)78 blanket cylinders (67)79 blanket cylinders (67) 80-81 drive motors (68, 73, 74)82 drive motors (69, 78, 79)83 drive motors (71)84 drive motors (72) 85-86 drive motors (74)87 drive motors (77)88 printing apparatus 89 plate cylinders (88) 90-91 blanket cylinders (88)92 impression cylinders (88)93 drive motors (89)94 drive motors (91, 92) 95-96 journal (71)97 journal (72)98 gear (71)99 gear (72) 100-101 coupling (71)102 coupling (72)103 journal (73)104 (74) 105-106 gear (73)107 gear (74)108 gear (73)109 gear coupling (74) 110-111 coupling 111 (73)112 coupling (74)113 gear (68)114 journal (68)115 and 116 brake (73)117 brake (74)

Claims (11)

1. A printing unit (1; 28; 47) of an offset printing press, comprising at least two forme cylinders (2, 3; 29, 31, 33, 32; 48, 49, 51, 52; 71, 72; 76, 77) and at least two transfer cylinders (4, 6; 34, 36, 37, 38; 53, 54, 56, 57; 73, 74; 78, 79), wherein each forme cylinder (2, 3; 29, 31, 33, 32; 48, 49, 51, 52; 71, 72; 76, 77) is driven individually by a suitable drive motor (26, 27; 42, 43; 44, 46; 62, 63, 64, 66; 83, 84; 86, 87), characterized in that: at least two transfer cylinders (4, 6; 34, 36, 37, 38; 53, 54, 56, 57; 73, 74; 78, 79) are coupled together for driving and have their own drive motors (24; 39; 41; 59; 81; 82).

2. A printing device according to claim 1, wherein: the transfer cylinders (53, 54, 56, 57; 73, 74; 78, 79) are each provided with an impression cylinder (58; 68; 69).

3. A printing device according to claim 2, wherein: the impression cylinder (58; 68; 69) is coupled to a transfer cylinder (53, 54, 56, 57; 73, 74; 78, 79) for driving, and the transfer cylinder (53, 54, 56, 57; 73, 74; 78, 79) and the impression cylinder (58; 68; 69) have the same drive motor (81, 82).

4. A printing device according to claim 2, wherein: the impression cylinder (58; 68; 69) has its own drive motor (61).

5. A printing device according to claim 2, wherein: the two transfer cylinders (73, 74; 78, 79) are provided with an impression cylinder (68; 69).

6. A printing device according to claim 2, wherein: the four transfer cylinders (53, 54, 56, 57) are provided with an impression cylinder (58).

7. A printing device as claimed in claim 5, wherein: the printing device (47) is formed by a 10-satellite printing device.

8. A printing device as claimed in claim 6, wherein: the printing device (47) is formed by a 9-satellite printing device.

9. A printing unit (88) of an offset printing press, comprising a plate cylinder, a transfer cylinder and an impression cylinder (89, 91, 92), respectively, where said plate cylinder (89) is driven individually by a drive motor (93), characterized in that: the mating transfer and impression cylinders (91, 92) are coupled together for driving to print the sheet (8) and are driven by the same drive motor (94) which is independent of the plate cylinder (89).

10. Printing device (1; 28; 47; 88) according to claim 1 or 9, characterized in that: the printing unit is arranged in a web printing press.

11. Printing device (1; 28; 47; 88) according to claim 1, characterized in that: the transfer cylinder (73; 74) can be selectively coupled to the plate cylinder (71; 72) for driving by means of a coupling (111; 112).