Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – And with bending
Reexamination Certificate
1999-12-08
2003-04-22
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
And with bending
C493S359000, C493S360000, C493S365000, C083S343000, C083S345000
Reexamination Certificate
active
06551227
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to a device for seizing of flat material on a transporting surface such as signatures on a outer surface of a paper conducting cylinder such as a folding cylinder of a folding apparatus.
BACKGROUND OF THE INVENTION
EP 0 220 644 A2 discloses a vacuum system for combination fold off control. A signature folder is disclosed in which a vacuum system is provided to prevent tail whipping of the signature when the direction of movement thereof is reversed. The folder provides two counter-rotating cylinders. A portion of the signature moves along the periphery of one cylinder and than reverses direction to move on to the periphery to the other cylinder. A vacuum system is provided adjacent to the signature when it reverses direction. The vacuum system includes a pair of guides and a central, freely rotatable vacuum roll. The vacuum causes the reversing portion of the signature to move into engagement with the guide and rolls and eliminates tail whipping. Further, it guides the signature so that it smoothly moves on to the periphery of the subsequent roll. The major drawback of said vacuum solution according to EP 0 220 644 A2 resides in the fact that by a vacuum source only the outermost layer of a respective leading edge of a web of material can be securely seized on a respective cylinder surface. A web of material including a plurality of different ribbons or different layers is not secured against opening-up during the transitory period after a respective signature has been severed from a web of material and a new leading edge has been created.
A recently published application which is not necessarily prior art to the present application, EP 0 931 748 A1 discloses a pinless folder apparatus assigned to a rotary printing press. This solution comprises a first paper-conducting cylinder the surface of which supports a web of material to be processed in the pinless folder apparatus. Said first paper-conducting cylinder cooperates with a cutting cylinder assigned thereto having a number of knife assemblies assigned to its respective outer circumference. According to this solution of the state of the art cyclically actuatable product holding means are provided either on the circumference of that first paper-conducting cylinder or on the respective circumference of the said cutting cylinder. Said product holding means are actuated so as to engage a respective leading edge supported on said first cylinder surface in counterclockwise direction, to seize a newly created leading edge after a signature has been severed from the respective lead edge of the web of material.
With this solution said respective holding elements have to be activated by a respective cam element which has to be arranged on a respective cylinder's end surface. A cam/cam follower assembly is quite space consuming and subject to maintenance and premature wear. The respective surface of the cam has to be hardened to be wear-resistant which renders the actuating component of the respective holding element more difficult to manufacture.
SUMMARY OF THE INVENTION
In view of the solution according to the state of the art it is accordingly an object of the present invention to provide for a product-seizing element actuatable by cooperation with a paper transporting surface supporting the respective flat material to be seized.
A further object of the present invention is to eliminate cam activation of product-seizing elements.
Still further, an object of the present invention is to provide for reliable positioning of a respective leading edge of a web of material upon a cutting operation when severing a signature from a multi-layered web of material.
According to the present invention a device for seizing a flat material on a supporting surface includes:
a first cylinder having knife assemblies assigned to its circumference,
a paper conducting cylinder supporting a flat material on its outer circumference and
biased product seizing elements assigned to said circumference of said first cylinder adopting upon cooperation with said flat material received on said outer circumference an engaging position.
Advantages of the present invention are the automatic actuation of pretensioned product seizing elements by contact of said product seizing elements with a respective opposite arranged transporting surface without activation of particular elements such as a cam or a cam follower. Said product seizing elements are advantageously mounted integrated within a respective surface of a cylinder either adopting a disengaged extending position due to the biasing force or a position in which they engage in a respective leading edge automatically exerting a force upon said leading edge due to the respective subjecting with a pretensioning element.
In further advantageous embodiments according to the present invention said product seizing elements by punctual contact only exert a seizing force upon said respecting flat material which results in a non-marking of the respecting leading edge by said product seizing elements and consequently in an non opening-up of said multi-layered web of material when including a plurality of ribbons. Said product seizing elements either may extend spaced apart from one another over the entire width of said web of material or the respective paper-conducting cylinder or maybe arranged in the middle or the respective lateral edge portion of said cylinder.
Said product seizing elements either can be biased by having a pretensioning element assigned to corresponding housings of said product seizing elements or having said product seizing elements subjected to a pressure source such as the pneumatic or hydraulic system.
In a very advantageous embodiment according to the present invention said product seizing elements are received movably within a knife box which easily is exchangeably arranged on a respective circumference of a first cylinder, such as respective cutting cylinder. To allow for an engagement of the very first part of the newly created leading edge of a multi-layered web of material said product seizing elements are arranged within a knife box in an inclined orientation. During the respective engaging movement of leading edge said heads of said product seizing elements contact said leading edge close to the cross-cut, severing a respective signature from a web of material thus creating a new product leading edge. By the close orientation of the respective product seizing element to the cross-cut a reliable registration of the respective new created product seizing element is guaranteed maintaining register of said leading edge upon the supporting surface allowing for a clear sharp cross-cutting operation between said two cylinders. Said accurate registration of the newly created product seizing element on the respective transporting surface of the transfer cylinder results in a high accuracy of the following cross-folding operations to be executed within a folder apparatus such as a pinless folding apparatus.
Said product seizing elements may include a rounded head portion and a pad or a layer to provide for a smooth contact surface for said leading edge to prevent marking on the respective product leading edge received and supported on said paper conducting cylinder.
A respective product seizing device advantageously can be used on cooperating cylinders such as folding-/ or paper-conducting cylinders of a folder apparatus, assigned to a web fed rotary printing press for commercial and newspaper applications.
According to a method of operation of a product seizing element on a surface of a cylinder in a folding apparatus said leading edge of a flat material is supported on a transporting surface, whereas said product seizing elements adopt a first disengaged position, prior to the engagement of the leading edge. In a first stage of cooperation said cylinder surfaces do not cooperate with each other but rather move according to the rotational speed gradually towards each other in circumferential direction. Upon contacting of the product seizin
Davidson Davidson & Kappel LLC
Kim Eugene
LandOfFree
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