Cutting – Tool or tool with support – Joint or connection
Reexamination Certificate
1999-02-22
2001-07-24
Ashley, Boyer D. (Department: 3724)
Cutting
Tool or tool with support
Joint or connection
C083S345000, C083S674000
Reexamination Certificate
active
06263775
ABSTRACT:
CROSS-REFERENCE TO RELATES CASES
This application claims the priority of German patent application Serial No. 198 07 111.6 filed Feb. 20, 1998. The disclosure of the German patent application, as well as that of each patent mentioned in the specification of the present application, is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The invention relates to improvements in cross cutters for running webs of paper, cardboard, metallic foil, plastic foil or the like, and more particularly to improvements in rotary knife holders or knife carriers which are utilized in such apparatus.
It is known to provide the rotary knife carriers of cross cutters for running webs of paper or the like with longitudinally extending peripheral recesses for elongated knives. Successive knives on one of the carriers (at one side of the path for the running web) cooperate with successive knives on the other carrier (at the other side of the path for the running web), not unlike the blades of shears or scissors, to sever the moving web in such a way that the cut is started at one marginal portion and proceeds transversely of and toward the other marginal portion of the running web. The selected planes of the knives in the respective recesses are or can be such that the cutting edges of the knives project from the respective recesses and that the knives are parallel or nearly parallel to imaginary tangents to the peripheral surfaces of the respective (normally cylindrical) carriers.
It is also known to employ readily detachable knives which are clamped against the respective carriers, namely against portions of surfaces bounding the respective recesses in the rotary drum-shaped carriers, and it is equally known to adjustably secure at least some knives to their carriers so that the knives on one of the carriers can be properly positioned relative to the complementary knives on the other carrier and/or that the knives can be adjusted in order to compensate for wear at and to sharpen the cutting edges. Reference may be had, for example, to German Petty Patent (Utility Model) No. 295 12 032.
The making of transverse cuts which begin at one marginal portion and proceed toward the other marginal portion of the running web is achieved by employing knives having a slightly helical shape. An important prerequisite for the making of clean cuts is that the pairs of cooperating knives on the two rotary carriers be properly adjusted relative to each other so that their cutting edges slide, without play, relative to each other in a manner known from the blades of shears, scissors or analogous cutting implements.
OBJECTS OF THE INVENTION
An object of the invention is to provide a novel and improved cross cutter for running webs or strips of paper, cardboard or the like.
Another object of the invention is to provide a novel and improved rotary carrier for use in a cross cutter.
A further object of the invention is to provide the carrier with novel and improved means for adjustably, accurately and reliably securing one or more knives to the rotary carriers in cross cutters for webs of paper or the like.
An additional object of the invention is to provide a novel and improved adjustable mounting for one or more knives on the rotary carriers of cross cutters for running webs of paper or the like.
Still another object of the invention is to provide novel and improved means for separably and adjustably securing knives to the rotary knife carriers of cross cutters for paper or the like.
A further object of the invention is to provide rotary carriers which can reliably support and permit accurate adjustments of simple and inexpensive (such as throw-away) knives adapted to be mounted in longitudinally extending peripheral recesses of their carriers.
Another object of the invention is to provide a novel and improved carrier-knife combination wherein all parts are readily accessible and (if necessary) removable or replaceable with little loss in time.
An additional object of the invention is to provide lightweight and inexpensive but long-lasting carriers which can be utilized in various types of cross cutters for running webs or strips of paper or the like.
Still another object of the invention is to provide a novel and improved arrangement of clamping, tensioning and adjusting means for the knives which are utilized in rotary carriers of cross cutters for running webs of paper or the like.
A further object of the invention is to provide a novel and improved method of installing, securing and adjusting knives in, to and relative to rotary carriers of cross cutters for running webs of paper or the like.
SUMMARY OF THE INVENTION
The invention is embodied in a cross cutter for running webs of paper, cardboard or the like. The improved cross cutter comprises a carrier (e.g., an elongated shaft or drum or cylinder) which is rotatable about a predetermined axis and is provided with a recess extending at least substantially in the direction of the axis. The carrier has a supporting surface which bounds a portion of the recess, and the cross cutter further comprises an elongated knife having a first lateral surface abutting the supporting surface in the recess and a second lateral surface which is or can be parallel to the first lateral surface. The cross cutter further comprises an elongated (one-piece or composite) clamping member which is at least partially received in the recess and has a retaining surface abutting the second lateral surface, at least one tensioning member which is affixed to the carrier and serves to urge the clamping member against the second lateral surface, and at least one adjusting member for the clamping member. The adjusting member is mounted on the carrier and is actuatable to move the clamping member and the knife transversely of the axis of the carrier. This causes the first lateral surface of the knife to slide along the supporting surface in the recess of the carrier.
The cross cutter further comprises a form-locking (e.g., mechanical and/or frictional) connection which is provided between the second lateral surface of the knife and the retaining surface of the clamping member (and/or elsewhere between the knife and the clamping member) and serves to compel the knife to share the movements of the clamping member under the action of the at least one adjusting member.
The carrier can further comprise a guide surface which bounds a further portion of the recess and includes a portion spaced apart from the knife. The clamping member of such cross cutter can have a contact surface which abuts the guide surface under the urging of the at least one tensioning member, and such contact surface is arranged to slide along the guide surface of the carrier in response to actuation of the at least one adjusting member. If the peripheral surface of the carrier is an at least substantially cylindrical surface, the guide surface in the aforesaid recess can extend substantially tangentially of the peripheral surface (and more particularly in substantial parallelism with an imaginary tangent to the peripheral surface).
The at least one tensioning member can include a threaded fastener extending through the clamping member in such orientation that its axis is at least substantially normal to the guide surface of the carrier. Te axis of the threaded fastener can extend at least substantially radially of the axis of the fastener. The at least one adjusting member can include a threaded fastener having an axis which is at least substantially normal to the axis of the threaded fastener forming part of or constituting the at least one tensioning member.
The supporting surface and the guide surface of the carrier make an oblique angle, e.g., an angle of close to but less than 180°. At least the first lateral surface of the knife can be at least substantially parallel to the supporting surface in the recess of the carrier.
The aforementioned form-locking connection between the clamping member and the knife can comprise a projection extending from the second lateral surface of the knife or from the adjacent retaini
Szczepaniak Wolfram
Vössing Dirk
Ashley Boyer D.
E.C.H. Will GmbH
Kinberg Robert
Spencer George H.
Venable
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