Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Means joining flexible indefinite length or endless bodies...
Patent
1991-01-18
1993-05-04
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Means joining flexible indefinite length or endless bodies...
156507, 242 584, B65H 1902
Patent
active
052078590
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for connecting the rear end of a web of material, which downstream undergoes a treatment or processing operation, to the front end of a following web of material, comprising a frame with guide rollers which determine a throughput section for the web of material, two pressure elements which are fitted on either side of the throughput section, and which are movable towards each other and away from each other virtually at right angles to said throughput section, and also cutting elements for cutting through the one and/or the other web of material.
Such a device is generally known and is used in, for example, printing machines in which the offcoming end of a used roll of paper has to be adhered to the beginning of a new roll of paper. In these known devices two rollers cooperating with each other are used as the pressure elements. The disadvantage of this is that the pressure force of these rollers has to be transferred via the bearings of these rollers, so that the pressure forces to be applied are limited. Besides, as a result of the deflection of the rollers, these known devices can be made only with a limited width, and processing of wide webs of material with them is thus not possible.
The object of the invention is to produce a device which can be made sufficiently wide for interconnecting wide webs of material, said device also being compact in structure and easy to operate.
These objects are achieved according to the invention in that the pressure elements each comprise a bar which is fixed between two plates movably suspended in the frame, each bar having a pressure face extending virtually along its entire length in the direction of the throughput section, the bars are provided with a slit-type recess extending virtually at right angles to the pressure face in the lengthwise direction of the bar, said slits connecting to each other when the bars are lying against each other, and a wire-type cutting element is fitted between the two bars at the level of these slits which can be displaced from a central position into the one or the other recess for cutting through a web of material.
The use of bars instead of rollers has the advantage that the structure can be made more rigid, so that the device can be made correspondingly wider. In addition, the pressure forces can easily be applied to the bars. It is particularly advantageous here to use a wire-type cutting element, which always remains between the two webs of material when the splice is being made, and can subsequently cut through the old offcoming web of material near the splice regardless of the side of this web on which the cutting element is located. This design of the cutting element thus permits a very compact and uncomplicated structure of the device.
In a preferred embodiment of the invention the two side plates by means of which each bar is suspended in the frame are hingedly connected at one side to an arm rotatably fixed on the frame, and at the other side are movably guided in a guide of the frame, in such a way that the bars are displaceable to the outside of the frame by turning through about 90.degree.. In this way the pressure faces of the pressure elements are easily accessible for the operating personnel, in order to prepare the two webs of material on the pressure face.
Other advantageous characteristics and features according to the invention emerge from Sub-claims 3-8.
The invention is explained in greater detail with reference to the drawings, in which:
FIG. 1 is a schematic picture of a plant in which a device according to the invention is incorporated;
FIG. 2 shows schematically a partial view of the device according to the invention;
FIG. 3 shows a more detailed cross-section of a pressure bar on an enlarged scale;
FIG. 4 shows schematically a cross-section of the pressure bar with retractable cutting plate.
The plant shown in FIG. 1 comprises a housing 1, in which is disposed rotatably a first roller 2 from which a web of material 3 runs to a device 5. A second roller 6 is also sup
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patent: 4374576 (1983-02-01), Ryan
patent: 4455190 (1984-06-01), Bianchetto et al.
patent: 4859270 (1989-08-01), Martin et al.
Ball Michael W.
Maki Steven D.
Meller Michael N.
Stork Contiweb B.V.
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