Sheet feeding or delivering – Feeding – By means to change direction of sheet travel
Patent
1996-12-06
1999-11-09
Terrell, William E.
Sheet feeding or delivering
Feeding
By means to change direction of sheet travel
271303, 198442, 209900, B65H 500, B65H 3910, B65G 4226
Patent
active
059798912
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device intended to effect a selection of cut paper- or cardboard blanks on a dispensing machine, in particular in order to eliminate from a flow or products those which are considered as defective. The present invention relates in particular to a selection device enabling the rate of selection to be very appreciably improved.
It is known that, after an operation of cutting out a web of paper- or cardboard, during which a flow of paper- or cardboard blanks and in particular cases, are formed, certain of the latter may prove to be defective. Such defective blanks are most often eliminated at the level of reception of the cases, which causes both a loss of time and a complication of the production process.
One solution consists in making this selection during displacement of the blanks, before they are received, so as to eliminate the additional sorting operation. It is known that one difficulty of such a modus operandi comes from the high speed of advance of these blanks which involves extremely rapid and precise selection means.
In annexed techniques, sorters have been used, capable of sorting products of about 30 cm in length in displacement at a speed of the order of 180 m/min, which represents a selection of 600 products per minute. Under such conditions, it is estimated that the reliability of sorting is of the order of 99.7%.
It is an object of the present invention to propose a selection device able to improve both the number of possible selections per minute and the reliability thereof.
The present invention thus has for an object a device for selecting cut paperboard blanks as they are fed between at least two series of drive belts defining two paths for the blanks, namely an upper path and a lower path forming an angle of bifurcation, this device comprising a path selection means consisting of a flap disposed in the angle of bifurcation of the two paths, and which is pivotably mounted about a downstream shaft capable of being placed in two positions, i.e. a lower, normal operating position in which the blanks are fed to the upper path, and an upper, selection position in which the blanks are fed to the lower path, characterized in that: the upstream and downstream portions adjacent to the pivotable flap, with a substantially uniform radius of curvature, the belt extending thereabove, so that, in the selection position, it defines therewith a substantially parallel path.
In one form of embodiment of the invention, the concavity of the curve is oriented towards the flap and the front part of the upper surface or the flap is incurved downwardly.
In another form of embodiment of the invention, the lower path of the belts driving the blanks, at least in the upstream and downstream parts close to the pivotable flap, forms a curve of which the radius of curvature is substantially uniform, the concavity of the curve preferably being oriented away from the flap. Furthermore, the lower surface of the flap may present a curvature close to that of the belt extending therebelow, so that, in position of normal operation, it defines therewith a substantially parallel path.
The device according to the invention preferably comprises means adapted to maintain the cardboard blank, at least at the moment of its passage at the level of the flap, over at least a part of its surface, between two holding elements of which at least one is constituted by a belt side. The other holding element may be constituted by another belt side or by a roller.
In one form of embodiment of the invention, the device comprises at least four belt which define the two upper and lower paths. In this device, upstream of the flap, a first portion of the lower side of a first belt or upper belt, and a first portion of the upper side of a second belt, or lower belt, are in contact, and downstream of the flap, a second portion of the lower side of the first belt is in contact with the upper side of a third belt and a second portion of the upper side of the second belt is in contact with the lower side of a fourth
REFERENCES:
patent: 3264917 (1966-08-01), Califano et al.
patent: 3791516 (1974-02-01), Tramposch
patent: 4102253 (1978-07-01), Gennicott
patent: 4120491 (1978-10-01), Lang
patent: 4570922 (1986-02-01), Akers
patent: 4747493 (1988-05-01), Nakinishi
Bower Ku
Komori-Chambon S.A.
Terrell William E.
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