Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Reexamination Certificate
2001-11-20
2004-02-10
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
C493S424000, C493S427000, C493S432000
Reexamination Certificate
active
06689041
ABSTRACT:
Priority to German Patent Application No. 100 58 758.5, which is incorporated by reference herein, is hereby claimed.
BACKGROUND OF THE INVENTION
The present invention relates to a folding jaw arrangement on product-processing folding cylinders such as a folding jaw cylinder which receives printed products during cross-folding in a folding apparatus.
European Patent Applications EP 0 931 747 A1 and EP 0 931 748 A1 relate to folding apparatuses for rotary printing presses which process material webs. A folding blade cylinder rotating about its axis co-operates with a cutting cylinder which includes additional guide devices in the region of the cutting blade bearing arrangement. The retraction and extending movements of gripper devices on the first copy-carrying cylinder and on the cutting cylinder co-operating with the first copy-carrying cylinder take place parallel between the normals to the lateral surfaces of the cylinders which co-operate with one another.
Via additional holding devices accommodated at the periphery of the cutting cylinder in the vicinity of the cutting blade bearing arrangement thereof, the leading edges of products which are cut off in the cutting gap are pressed onto the peripheral surface of a rotating folding blade cylinder accommodated opposite before they are gripped over at the leading edge by the grippers thereof and, in this manner, are fixed onto the lateral surface of the folding blade cylinder. Thereupon, the holding devices move back into the peripheral surface of the cutting cylinder while the cutting cylinder continues to rotate.
U.S. Pat. No. 6,038,974 relates to a deceleration device co-operating with a folding jaw cylinder. A deceleration device contains five gripper devices which in each case pick up the leading edges of products which are cut off in the cutting gap. Allocated to the gripper devices which constitute the deceleration units are in each case extendable folding blades whose extending movement at the lateral surface is coupled with the release of the leading edge of the copy by the gripper devices. The deceleration device includes five separate arms which can be decelerated in their circumferential speed in such a manner that the products which are grasped by gripper devices provided on the arms overlap one another. At the moment of the extension of the cross-folding blades and of the release of the holding devices, the circumferential speeds of the transferring deceleration devices and that of the folding located opposite jaw correspond to each other.
German Patent No. 44 12 142 C2 relates to a folding apparatus including a gripper- and folding blade cylinder which features a first gripper and a first folding blade as well as a gripper- and folding jaw cylinder which features second gripper- and folding jaw stations for conveying sheets for book production or for making a fold for the cross-fold production in sheets. According to this proposed design approach, the gripper- and folding blade cylinder is constituted by only one cylinder body. The folding jaw stations and the second grippers on the gripper- and folding jaw cylinder are accommodated at a fixed distance from each other. This distance is formed by the sum of half of the length of the sheets, half of the length of the maximum possible pre-fold, and of an additional length. The additional length is made up of the distance between the leading edge of the sheets and the trailing edge of the second grippers as well as a safety margin. The gripper- and folding blade cylinder features a first cylinder body which carries the folding blades and which is coupled to the drive gear of the gripper- and folding jaw cylinder via a gear wheel. Furthermore, this gripper- and folding blade cylinder features a second cylinder body which carries the first grippers, it being possible the two cylinder bodies to be rotated relative to each other during the change-over between book production and cross-fold production.
SUMMARY OF THE INVENTION
The object of the present invention is to improve the holding of printed products in folding jaws during the product transfer from one cylinder surface to another cylinder surface.
The present invention provides a folding jaw arrangement (
11
) on a folding jaw cylinder (
10
) in a folding apparatus of a rotary printing press, comprising a stationary folding jaw part (
13
) and a movable folding jaw part (
14
;
29
,
40
) between which a gap (
12
) is formed into which a folding device or means (
5
) of a further cylinder (
4
) co-operating with folding jaw cylinder (
10
) plunges for folding the products. The movable folding part (
14
;
29
,
40
) is provided with resilient regions (
20
,
27
) which press the product against the stationary part (
13
) during the folding process.
The advantages which can be attained using the design approach proposed according to the present invention are to be seen above all in that, by designing the movable folding jaw part to have resilient regions, on one hand, a holding force which is adapted to the spine thickness of the folded signatures can be produced for the specific product in the folding jaw arrangement configured according to the present invention and, on the other hand, it is guaranteed that by the extending movement of the folding means, for example the folding blade, accommodated at the opposite cylinder, it is prevented that layers of a sheet-like product formed of a plurality of layers are ejected from the folding jaw or that the edges of the layers of the product which are in immediate contact with the folding means are folded over. The resilient regions of the movable folding jaw which produce the individual holding force on the stationary folding jaw depending on the product thickness are preferably arranged in such a manner that they are located in the regions at the periphery of the folding jaw cylinder which, in the case of cylinders working without pins, are encircled by conveyer belts and are disposed such that they correspond to recesses which are provided on the folding means and which facilitate the retraction movement of the folding means from the folding jaw gap with the product being in the pushed in position.
In a variant of an embodiment, the movable folding jaw part can include a plurality of folding jaw sections extending over the width of the folding jaw cylinder. The folding jaw sections can be demountably arranged on a folding jaw shaft which jointly drives all folding jaw sections and which is controlled such in a manner that is phased with the entering movement of the folding means of the product-transferring cylinder, for example, via a roller/cam control or an individual electric drive at the folding jaw cylinder. The individual sections constituting the movable folding jaw can be arranged on the folding jaw shaft in such a manner that clearances are formed between the individual folding jaw sections, the clearances corresponding to the respective positions of lifter elements entering into longitudinal grooves at the lateral surface of the folding jaw cylinder.
In another variant of an embodiment of the basic idea of the invention, it is also possible for the movable folding jaw part to be formed in one piece. The folding jaw formed in one piece can also be replaceably accommodated on a shaft which can be actuated via a roller/cam control or via an individual electric drive.
In a preferred variant of an embodiment of the movable folding jaw part, whether it is composed of a plurality of sections or formed in one piece, the resilient regions are designed as resilient tongues which are bounded by slot-shaped openings. The contact force exerted by the resilient tongues upon the folding spine of the product which is pushed into the folding jaw can be predetermined via the length of the slot-shaped openings in the individual folding jaw sections or in the movable folding jaw part formed in one piece. At the individual resilient regions which are designed, for example, as resilient tongues, additional coatings can be applied with overthickness, i.e., increased material thic
Lanvin Serge
Robert Jean Francois
Robin Philippe
Davidson Davidson & Kappel LLC
Heidelberger Druckmaschinen AG
Kim Eugene
Tawfik Sameh
LandOfFree
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