Severing by tearing or breaking – Breaking or tearing apparatus – Work-parting pullers
Reexamination Certificate
1997-07-18
2001-03-27
Ashley, Boyer (Department: 3724)
Severing by tearing or breaking
Breaking or tearing apparatus
Work-parting pullers
C225S004000
Reexamination Certificate
active
06206262
ABSTRACT:
FIELD OF THE INVENTION
The invention pertains to a separating device for severing perforated tube sections.
BACKGROUND OF THE INVENTION
A separating device of this type is, for example, disclosed in DE 4,113,792 A1. In this known separating device, a tubular web is transported at a certain advance speed by the advancing mechanism. During this advance motion, the tubular web passes through a tearing mechanism that is arranged behind the advancing mechanism viewed in the transport direction, namely such that the rolls or cylinders of the tearing mechanism or the bands that are guided over said rollers or cylinders come in contact with the tubular web. If it is intended to separate a tubular web into tubular web sections by tearing the tubular web along a perforation that extends perpendicular to the longitudinal direction of the tubular web, the rolls or cylinders of the tearing mechanism are moved against the tubular web and driven at a higher circumferential speed than the rolls or cylinders of the advancing mechanism in order to tear off the tubular sections. During this tearing process, a tensile force is exerted upon the entire following web due to this differential speed. This tension also acts upon the advancing mechanism as long as the perforations are not separated. In the aforementioned separating device, the opposing rollers or cylinders of the advancing mechanism are arranged offset to one another. Consequently, the tubular web extends between these rollers or cylinders in the shape of a serpentine. However, practical experience has shown that the pressing force that is exerted upon the tubular web via the bands that extend around the rollers or cylinders does not suffice for retaining the tubular web once the tearing mechanism is engaged and—as described previously—exerts a tensile force upon the following tubular web. This causes an undesirable slippage that influences the tearing process unfavorably and can also lead to striations because the web slides along the bands.
DE 4,243,105 A1 discloses another separating device developed for severing perforated tube sections in which the rollers or cylinders that are arranged underneath the tubular web to be separated in the tearing mechanism as well as in the advancing mechanism are pressed against the tubular web in a synchronized fashion so as to tear off the perforated tube sections. In this case, the rollers or cylinders are respectively moved back and forth in a translational fashion, namely in a direction that extends perpendicular to the tubular web. However, the constructive realization of this separating device is comparatively complicated due to the translational guidance of the rollers or cylinders.
SUMMARY OF THE INVENTION
The invention is based on the objective of further designing a separating device of the initially mentioned type in such a way that said separating device has a simple design and allows the safe and undamaged separation of tube sections from a perforated tubular web.
According to the invention, this objective is attained by arranging the opposing rollers or cylinders of the tearing mechanism in respective swivel arms that can be swiveled around swiveling axes that oppose one another in the transport direction of the tubular film in such a way that the swivel arms can be swiveled apart in opposite directions. This simple measure makes it possible that the opposing rollers or cylinders can simultaneously come in contact with the tubular web when tearing off a perforated section. In this case, it is not necessary to guide an entire set of rollers or cylinders in a translational fashion. On the contrary, only a swiveling motion that is comparatively simple to implement is required. This particularly simple solution is possible because the swiveling motions of the swivel arms that carry the rollers or cylinders extend in the same direction.
According to one advantageous embodiment of the invention, a connecting rod is coupled with one of the swivel arms arranged on top of the transport plane of the tubular web and a pressure rod is coupled with one of the swivel arms arranged underneath the transport plane of the tubular web. A lever and a cam plate act upon the connecting rod and the pressure rod in such a way that the swivel arms can be swiveled toward one another as well as apart from one another around their respective swiveling axis.
In another embodiment, the rollers or cylinders of the opposing rollers or cylinders which are arranged on top of the transport plane of the tubular web are situated on shafts that are rigidly connected with the bearing shield. However, the rollers or cylinders arranged underneath the transport plane of the tubular web are situated on shafts that are connected with plates which are movably guided in the bearing shields, with a piston-cylinder unit engaging on one swiveling point of the movable plates. One roller or cylinder is situated on a shaft that is rigidly connected with the plates while two rollers or cylinders are situated on shafts that are arranged in a rocker that is suspended in the plates in a swiveling fashion. This arrangement of the rollers or cylinders makes it possible for all three rollers or cylinders which are situated adjacent to one another simultaneously to come into contact with the opposite rollers or cylinders when they are actuated by the piston-cylinder unit because any unevenness is immediately compensated by the swiveling motion around the respective swiveling points.
According to one additional advantageous embodiment of the invention, movement that controls the connecting rod or the pressure rod of the tearing mechanism is also transferred onto the movable rollers or cylinders of the advancing mechanism by means of an arrangement of rods, with these rods preferably engaging on one side of the rocker. A push rod of these transfer rods can be coupled with the additional components of the rods by means of a spring. This measure prevents the roller or cylinder upon which the rods act from being abruptly pressed against the tubular web because a spring-dampened movement of the roller or cylinder against the opposite roller or cylinder is attained.
The bearing shields of the tearing mechanism and the advancing mechanism which are arranged on top of the transport plane of the tubular web can also be arranged in such a way that they can be swiveled around an axis, with the swiveling axis coinciding with the rotation axis of those deflection rollers for the conveyor band which lie toward the rear viewed in the transport direction of the tubular web. This pivoting apart in a direction that extends opposite to the transport direction makes it possible to pivot the conveyor belts that lie on top of the transport plane apart if a foreign object, e.g., a screwdriver or the like, is transported between these belts. The aforementioned pivoting apart prevents the destruction of the adjoining rollers or cylinders.
The conveyor belts of the tearing mechanism and the retaining mechanism can, in particular in the latter described embodiment of the invention, be driven by means of a mechanically driven toothed belt. In this case, the toothed belt is guided over toothed pulleys that are arranged in a rotationally rigid fashion on shafts of deflection rollers, with the toothed pulleys situated on top of the tubular web being arranged on the axis around which the bearing shields can be swiveled.
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Achelpohl Fritz
Brinkmeier Friedhelm
Eckelt Ulrich
Feldkamper Richard
Ashley Boyer
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Windmoller & Holscher
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