Cutting – Tool or tool with support – Joint or connection
Patent
1998-08-05
2000-09-12
Rachuba, M.
Cutting
Tool or tool with support
Joint or connection
83599, 8369911, B26D 726
Patent
active
061161349
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cutter, in particular for trimming sealed packaging-tube ends.
BACKGROUND OF THE INVENTION
Cutting tools for the trimming of sealed packaging-tube ends are used in tube filling machines where the tubes are processed in an in-line procedure; i.e., empty tubes provided with a closure are set into a holder in the machine, the tubes are indexed to a filling station where the tubes are filled with product through their open ends and then closed in order to be finally fed out in the form of filled tubes.
Apart from these process steps, there are normally additional steps in the form of checking operations, marking stations and trimming (i.e., clean-cutting) of the seal which provides the closed end after filling.
Present machines operate at a high production speed, which requires precision in the various processing stations.
It has been shown that certain tube materials, typically those in laminate form, comprise layers which cause a great deal of wear on the cutting tools or the cutting edges. This wear is possibly due to the presence of silicon oxide in the material.
An object of the present invention is to allow self-adjustment of the cutting tool while at the same time maintaining precision, as well as allowing readjustment as soon as the self-adjustment is no longer sufficient.
In British Patent No. 2,248,577 there is disclosed a cutter which is designed particularly for cutting paper in fax machines. Primarily, the cutter provides adjustment means for positioning an active blade and a passive blade such that the effective distance between the cutting edges of the blades is not too long. By using a resilient support for the passive blade, the cutter blades initially are set to overlap.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been realized by the invention of a cutter comprising a first blade holder for a first cutting blade, a second blade holder for a second cutting blade, support means for supporting the first and second blade holders juxtaposed with each other, a maneuvering mechanism for moving the first and second blade holders parallel to each other in a cutting direction between forward cutting positions wherein the first and second cutting blades meet in parallel movement in order to effect the cutting and return positions wherein the first and second cutting blades are separated from each other, at least one of the first and second blade holders comprising a sprung holder including an upper surface, a lower surface, a predetermined width parallel to the cutting direction, a pair of material weakening channel zones associated with one of the first and second cutting blades defining a supporting zone for the one of the first and second cutting blades, each of the pair of material weakening channel zones including a first material weakening channel extending from the upper surface of the sprung holder and across the entire predetermined width of the sprung holder, the second material weakening channel juxtaposed with the first material weakening channel, the second material weakening channel extending from the lower surface of the sprung holder and across the entire predetermined with of the sprung holder, thereby creating material bridges between the first and second material weakening channels creating an elongation zone, and an adjustment screw positioned in at least one of the material weakening channels whereby the material bridges may be displaced in order to displace the supporting zone in an adjustment direction substantially perpendicular to the cutting direction.
In accordance with a preferred embodiment of the present invention, the adjustment screw is conical and positioned in at least one of the first and second material weakening channels parallel to the cutting direction. In another embodiment, the first and second material weakening channels are provided by spark machining of the spring holder.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention may be mor
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Fransson Jan-Olof
Nilsson Jan
Norden Pac Development AB
Rachuba M.
Tran Kim Ngoc
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