Sheet feeding or delivering – Special articles
Patent
1991-10-02
1993-08-24
Schacher, Richard A.
Sheet feeding or delivering
Special articles
271176, 271228, B65H 2902
Patent
active
052382346
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a continuous-operation device for the treatment of leather and similar materials, in particular a printing, dyeing, smoothing, or dewatering device, with a traversing path that extends through at least one roller unit, especially a pair of rollers. Such continuous-operation devices are frequently and widely used in tanning and leather working. Conveyor, vacuum, and pressure equalization belts, or similar endless-loop flexible elements often extend along the traversing path between the surfaces of the roller pair on the outlet side or, if applicable, of upstream roller pairs.
In the discharge area of the roller unit, the emerging edge area of the leather pieces adhere more or less strongly to a roller surface or to the surface of a revolving belt extending through the roller pair involved. For the sake of simplicity, a roller surface will be referred to exclusively in this context in the following discussion.
Generally speaking, the problem arises of quickly and reliably releasing the edge area of the emerging leather pieces from the roller surface to which the leather adheres so that the continuous operation process will not be impeded and the leather will not be damaged. Hence the problem to be solved by the invention is creation of continuous operation devices of the type referred to in the foregoing that permit such separation of the leather from the roller outlet in continuous operation.
SUMMARY OF THE INVENTION
This problem is solved by the two alternative embodiments of the present invention, which in principle are to be used separately but if desired can be applied advantageously together in appropriate combinations. They are based on a common inventive concept. Among other things, this concept involves keeping at least the sensitive grain side of the leather free from relative movement with respect to machine elements, that is, from undesirable sliding or frictional application, and thus from damage, during the process of emergence over the length of the leather piece, inside the leather surface, except at most in the narrow area of the emerging edge. This is particularly important in the case of continuously operating staining and imprinting machines, inasmuch as the grain or outer side of the leather just provided with stain is still sensitive to pressure. Both the pulling of the leather by driven gripping means and the release by means of compressed air jets provide optimum satisfaction of these operational requirements. The first embodiment is especially well suited for leather having surfaces difficult to separate from the roller.
Other objects and advantages of the present invention will become more apparent to those persons having ordinary skill in the art to which the present invention pertains from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a leather staining machine of the present invention.
FIG. 2 is a plan view of the embodiment of FIG. 1.
FIG. 3 is a partial longitudinal section of the gripping means of the embodiment of FIGS. 1 and 2.
FIG. 4 is an enlarged side view of the roller discharge area of the embodiment of FIGS. 1 through 3.
FIG. 5 is a schematic diagram of the control process of the embodiment of FIGS. 1 through 4.
FIG. 6 is a second operating situation wherein the gripping means is in the waiting position.
FIG. 7 is a front view of a second embodiment of the present invention.
FIG. 8 is a side view of the embodiment of FIG. 7.
FIG. 9 is a third embodiment of the present invention.
FIG. 10 is an enlarged view of the embodiment of FIG. 9.
FIG. 11 is an enlarged sectional view of the embodiment of FIGS. 9 and 10 showing the distribution of gripping means over the roller.
FIG. 12 is an enlarged side view of the roller of FIGS. 9, 10 and 11.
FIG. 13 is a view of the embodiment of FIGS. 9 through 12 showing the punching element in the inactive state.
FIG. 14 is a view of the embodiment of FIGS. 9 through 12 showing the punching element in the active state.
REFERENCES:
patent: 4588184 (1986-05-01), Jeschke
patent: 4776579 (1988-10-01), Romand
Finco Rocco
Kerber Werner
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