CN101500808A

CN101500808A - Method and apparatus for preventing plate cylinder contamination during a plating process

Info

Publication number: CN101500808A
Application number: CNA2006800555028A
Authority: CN
Inventors: M·B·迪迈; J·A·潘特埃里奥斯; L·兹拉廷; M·R·勒梅林
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 2006-08-08
Filing date: 2006-08-08
Publication date: 2009-08-05
Also published as: EP2049334A1; EP2049334A4; WO2008018863A1; JP2010500196A

Abstract

In a preferred embodiment of the invention, the printing press (110) includes plate cylinders (116, 118), blanket cylinders (124, 126) and support means (112, 114) for Plate cylinders are mounted movable in opposite directions relative to the blanket cylinders (124, 126). A urging device (136) is provided and configured to urge the plate cylinders (116, 118) and blanket cylinders (124, 126) toward each other to form a nip (132). In accordance with a feature of the present invention, a stop (150) is positioned and configured to maintain a minimum spacing between said plate cylinders (116, 118) and blanket cylinders (124, 126).

Description

Prevent the contaminated method and apparatus of plate cylinder in the plate change process

Background technology

In offset printing (offset printing) operation, plate cylinder and relative blanket cylinder rotation contact.Described plate cylinder is carrying the forme with the surface that comprises image to be printed, and described blanket cylinder is carrying printing blanket.In described relative roller rotating process, described image by inking and with the form of inking image on the nip (nip) between described plate cylinder and the described blanket cylinder locates to be transferred to blanket on the blanket cylinder.Described blanket on the described blanket cylinder is transferred to described inking image subsequently just on materials printed, such as the coil paper (web of paper) by the blanket cylinder transmission of rotating.

Plate change process (plating process) is the described version of changing by described plate cylinder carrying, to realize the change of presswork.In the plate change process of offset press, with the version removal, will make that the plate cylinder surface temporarily directly contacts relative blanket cylinder before inserting new edition from the plate cylinder.This may cause the pollution on the described surface of described plate cylinder, and described version and described blanket cylinder service life have separately been shortened in the pollution on version surface, have reduced efficient and cost benefit that whole offset printing is operated thus.

Summary of the invention

The invention provides and be used for preventing at the contaminated method and apparatus of plate change process plate cylinder.

In a preferred embodiment of the invention, a kind of printing machine comprises plate cylinder, blanket cylinder and is used for plate cylinder is mounted to bracing or strutting arrangement relative with blanket cylinder one-tenth, that movably concern.Pressing device is set up and is configured to plate cylinder and blanket cylinder are pushed towards each other to form nip.According to feature of the present invention, be provided with and construct stop part so that keep the minimum interval between plate cylinder and the blanket cylinder.

According to another embodiment of the present invention, a kind of being used for carried out the plate change method of operating at offset press, may further comprise the steps: also engage between them, to form nip towards relative blanket cylinder pushing plate cylinder, plate cylinder has the forme that is mounted thereon, and blanket cylinder has the blanket that is mounted thereon.According to feature of the present invention, forme removal from the plate cylinder, and when removal forme from plate cylinder, keep plate cylinder and the interval between the blanket of blanket cylinder.

According to the third embodiment of the present invention, a kind of method that in offset press, forme is installed on the plate cylinder, comprise step: towards having blanket cylinder pushing plate cylinder blanket, relative and engaging, and make between the blanket on plate cylinder and the blanket cylinder and keep the minimum interval, and; By the end with forme is inserted in the slit on the plate cylinder and rotation is pushed plate cylinder and blanket cylinder forme is installed on the plate cylinder, thereby between forme and blanket, forms nip.

Description of drawings

Fig. 1 is the side view of existing offset press in the plate change process.

Fig. 2 is the side view of offset press in the plate change process of carrying out according to characteristics of the present invention.

Fig. 3 is that the offset press of Fig. 2 is in the side view of three during the position at described forme.

Fig. 4 is the side view of the offset press of Fig. 2, and wherein being in the example purpose is that adjustable stop part of expressing according to characteristics of the present invention has omitted printing cylinder and blanket cylinder.

Fig. 5 is another view of the adjustable stop of Fig. 4 characteristics.

The specific embodiment

With reference to accompanying drawing, and, show the side view of the prior art offset press in the plate change process at first with reference to Fig. 1.Printing element 10 comprises pivotable

plate support arms

12 and 14, and each support arm is arranged to be rotatably installed in the end of plate cylinder 16 separately and 18.A pair of

blanket cylinder

24 and 26 respectively supported

structures

28 and 30 rotatably supports, and engages with a corresponding rotation in described plate cylinder 16 and 18.Well-known as the present technique field, but by described

pivotal support arm

12 and 14 with the engaging of being provided that be provided with of described supporting

construction

28 and 30, formed nip 32 between plate cylinder 16 and the blanket cylinder 24 and the nip 34 between plate cylinder 18 and the blanket cylinder 26, the version of being carried from each

printing cylinder

16 and 18 with the image that is used for inking goes up transfer printing (transfer) to the blankets by each

corresponding blanket cylinder

24 and 26 carryings.

As known in the art, each plate support

arms

12 and 14 is mounted to

round pivoting point

20 and 22 separately and moves pivotally, so that described

plate cylinder

16 and 18 can move in throwing off (throw off) process.For this reason, the pressing device such as cylinder apparatus 36 is connected in each

plate cylinder

16 and 18 at

driving coupling

38 and 40 places.Cylinder apparatus 36 optionally activates, in disconnecting process plate cylinder 16 is separated with 26 with corresponding blanket cylinder 24 with 18.A pair of

stop part

37 and 39 is arranged to limit respectively the outside motion of two

plate cylinders

16 and 18.

As known in the art, in printing operation, cylinder apparatus 36 be arranged to push printing cylinder 16 with 18 to contacting with 34 place's pressure at separately nip 32 with 26 with corresponding blanket cylinder 24.

In Fig. 1, show the plate change process, wherein just unload forme 42 from plate cylinder 16.Be clearly shown that as Fig. 1, when the tail end 44 of forme 16 during by nip 32, the pressure pushing of cylinder apparatus 36 make plate cylinder 16 surface and relative blanket cylinder 24 surface engagement and directly contact.As mentioned above, this contact has caused the surface of plate cylinder 16 and the surface of the blanket on the blanket cylinder 24 to be polluted.Surface contamination is extremely undesirable, because this has shortened the service life of version and blanket, has reduced the efficient and the cost benefit of whole offset printing operation thus.

With reference to Fig. 2, show the side view of offset press in the plate change process of carrying out according to characteristics of the present invention.In Fig. 2, the structure of offset press 110 is identical with the basic structure of prior art printing machine shown in Figure 1.Support arm 112 and 114 respectively is arranged to rotatably to install (around pivoting point 120 and 122) end in plate cylinder 116 separately and 118.

A pair of blanket cylinder 124 and 126 is rotatably supported by supporting construction 128 and 130 respectively, and engages with a corresponding rotation in plate cylinder 116 and 118.Described rotation is bonded on and forms nip 132 between plate cylinder 116 and the blanket cylinder 124 and form nip 134 between plate cylinder 118 and blanket cylinder 126, to be used for that the image of inking is transferred to the blanket that is installed on each corresponding blanket cylinder 124 and 126 from the version separately that is installed on each printing cylinder 116 and 118.

As the prior art printing machine 10 of Fig. 1, as known in the art, in printing machine shown in Figure 2, each plate support arms 112 and 114 is mounted to

round pivoting point

120 and 122 separately and moves pivotally, so that plate cylinder 116 and 118 can be moved in disconnecting process.Cylinder apparatus 136 is connected in each plate cylinder 116 and 118 respectively at driving coupling 138 and 140 places.Pressure cylinder arrangement 136 optionally activates, in disconnecting process plate cylinder 116 is separated with 126 with corresponding blanket cylinder 124 with 118.A pair of stop part 137 and 139 is arranged to limit respectively the outside motion of two plate cylinders 116 and 118.As the printing machine 10 of Fig. 1, cylinder apparatus 136 also operate with at separately nip 132 and 134 places with printing cylinder 116 with 118 towards corresponding, relative blanket cylinder 124 and 126 pushings.

According to characteristics of the present invention, in the plate change operating process, when in the operation of removal version, when the tail end 144 that is arranged on the forme 142 in the slit of plate cylinder 116 has surpassed nip 132 (perhaps in the version operation is installed before end 144 enters nip 132), plate cylinder 116 be provided with and be configured to corresponding relative blanket cylinder 124 for separating relation, as shown in Figure 2.Thus, prevented the pollution that causes between the surface of described cylinder.When not having forme 142 in nip 132, by the effect of cylinder apparatus 136,

cylinder

116 and 124 continues to be pushed towards each other, but keeps spaced apart each other.

In a preferred embodiment of the invention, when not having forme in described nip, described interval is set at the thickness less than forme 142 dimensionally.

Referring now to Fig. 4, show the side view of the offset press of Fig. 2, for the purpose that illustrates at the preferred arrangements that keeps described interval, omitted plate cylinder and blanket cylinder.According to characteristics of the present invention, stop part 150 is installed on support arm 112 at the position adjustable ground relative with relative support arm 128.The size of stop part 150 and adjustable extent setting also are configured to: in the plate change operation (when not having forme in described nip), stop part 150 engages supporting construction 128, so that the spaced relationship between plate cylinder 116 and the blanket cylinder 124 to be provided, as Fig. 3 clearly shown in.As mentioned above, the dimension adjustable at described interval also is set at thickness less than the forme 142 of institute's removal, is pushed towards each other to make described relative cylinder by cylinder apparatus 136, but keeps spaced apart each other.

Fig. 3 show Fig. 2 offset press the forme 142 that just is being mounted by nip 132 (and reached 3 constantly positions) afterwards or just by the forme of removal by the side view before the nip 132.In the fitting operation at this moment, for example, push

cylinder

116 and 124 to the thickness of described version open by nip 132 end 144, causes impressing between described cylinder (impression), to carry out effective printing operation.Thus, when in described nip, having forme 142, keep impression,, avoided exposed plate cylinder and the contact of the surface between the relative blanket on the blanket cylinder still by above-mentioned spaced relationship to print.

Because the described size in the described spaced relationship is less than the thickness of described forme, so in case insert forme 142 in plate change operation shown in Figure 3, stop part 150 is removed (displace) from becoming with relative supporting construction 128 contacts.Fig. 5 shows after described forme had been inserted nip 132 (as shown in Figure 3), the gap 152 of the 0.2mm between stop part 150 and the relative supporting construction 128.This makes that having suitable pushing pressure between relative plate cylinder 116 and blanket cylinder 128 impresses.

In aforementioned specification, the present invention has been described with reference to the concrete exemplary embodiment and the example.But, it is evident that, under the spirit and scope of the more broad sense that does not break away from the claims of the present invention of enclosing, can make various modifications and variations to the present invention.Accordingly, this specification and accompanying drawing will not be from limited significance but come in an exemplary fashion to be explained.

Claims

1, a kind of printing machine comprises:

Plate cylinder;

Blanket cylinder;

Bracing or strutting arrangement, it is used for plate cylinder is mounted to blanket cylinder to become relative, movably concern;

Pressing device, its setting also is configured to plate cylinder and blanket cylinder are pushed towards each other, to form nip; And

Stop part, its setting also is configured to make between plate cylinder and the blanket cylinder and keeps the minimum interval.

2, printing machine as claimed in claim 1, wherein, be used for that plate cylinder is mounted to described bracing or strutting arrangement relative with blanket cylinder one-tenth, movably relation and comprise pivotable support arm, described support arm is used for installing pivotly plate cylinder so that plate cylinder towards with away from the motion of described relative blanket cylinder; And described stop part is installed on the described support arm so that keep the minimum interval between plate cylinder and the blanket cylinder.

3, printing machine as claimed in claim 2,

Wherein, described stop part adjustable ground is installed on the described support arm.

4, a kind of method that is used for removal forme from the offset press comprises step:

Also engage to form nip between them towards relative blanket cylinder pushing plate cylinder, plate cylinder has the forme that is mounted thereon, and blanket cylinder has the blanket that is mounted thereon; And

When removal forme from plate cylinder, keep plate cylinder and the interval between the blanket on the blanket cylinder.

5, method as claimed in claim 4,

Wherein, the size at described interval is less than the thickness of described forme.

6, method as claimed in claim 4,

Wherein, the dimension adjustable at described interval is optionally to set described interval.

7, a kind of method that in offset press forme is installed on the plate cylinder comprises step:

Towards having blanket cylinder blanket, relative pushing plate cylinder and engage, and make between the blanket on plate cylinder and the blanket cylinder and keep the minimum interval, and;

By the end with forme is inserted in the slit on the plate cylinder and rotation is pushed plate cylinder and blanket cylinder forme is installed on the plate cylinder, thereby between forme and blanket, forms nip.