Conveyors: power-driven – Conveyor system for arranging or rearranging stream of items – By queueing items from quantity source of items into stream...
Patent
1980-11-10
1984-02-07
Valenza, Joseph E.
Conveyors: power-driven
Conveyor system for arranging or rearranging stream of items
By queueing items from quantity source of items into stream...
198357, 198572, 198577, B65G 4768
Patent
active
044297815
DESCRIPTION:
BRIEF SUMMARY
The invention relates to supplying individual items to a conveyor which may be a continuous conveyor wherein the individual item, after the process of being loaded on the continuous conveyor, is made to assume a predetermined geometrical position thereon, the original speed of the individual item, which may in an extreme situation be zero, differing substantially from the conveying speed of the continuous conveyor.
It is known to supply individual piece goods or items to a conveyor or a conveying apparatus or means which distributes the piece goods or items or which is intended to transport them in a specific sequence, when the speed of the individual item prior to supply differs substantially from the speed of the receiving conveyor or conveying apparatus, or means for example due to manual handling.
For the following reasons, a predetermined position is required during the conveying processes described: placed on the receiving conveying apparatus in the closest possible relationship. carrier element is occupied by each individual item, then the individual item must be positioned in the predetermined location in respect of this carrier element. conveying means if the locations on the receiving conveying means were predetermined by a control system even prior to the individual items being received by the conveying means.
The predetermined location of the individual item on the receiving conveying means must be achieved with a variation in speed, as a rule an acceleration. The moment of commencement of this acceleration is triggered by a control signal synchronised to the conveying means which receives the item. Acceleration of the individual item can be effected by a positive application of force (a gripping, pushing or entraining means) or by frictional engagement of force (friction force between individual item and conveying means).
The positive application of force however has the disadvantage of requiring high mechanical cost and considerable space as in the case of the construction according to German Auslegeschrift No. 15 56 221, which is then further increased if the individual items are likely to be of extremely differing dimensions. Furthermore, the force applied in positive fashion to the individual item should as far as possible be so applied as to avoid the individual item being tipped over because, should this happen, it would be impossible adequately to ensure an accurate positioning of the individual item on the conveying means which is to receive it. If the receiving conveying means is left the task of providing the acceleration by positive engagement, then even at quite usual speeds, inadmissibly high impact forces may act upon the individual item which may for example prevent an accurate placement of the receiving conveying means.
The frictional application of force to the individual item is effected by the conveying means described at the outset in the first case in that the individual time is accelerated together with the conveying means and in the second case in that the conveying means runs constantly at a determined speed, the individual item being however, positively prevented from onwards movement until the moment of starting.
In the first case, prior art methods endeavour to carry out acceleration over the shortest possible distance, so that the maximum working frequency remains so high that every possible location on the receiving conveying means can be loaded by one and the same conveying means as described at the outset, or so that the distances between individual items are as small as possible.
It is thereby not entirely out of the question that the maximum possible frictional force between individual item and conveying means is exceeded, resulting in slipping, or that the acceleration force is so great that tipping over is initiated. These unacceptable factors remain tolerable only if the period of action of these forces and thus the acceleration time remains short.
Shortest possible acceleration path and short acceleration time impose limits on the speed to which it is possi
REFERENCES:
patent: 1939184 (1933-12-01), Neuman
patent: 2901083 (1959-08-01), McGrath
patent: 3485339 (1969-12-01), Miller et al.
patent: 3613863 (1971-10-01), Hedrick
patent: 3747781 (1973-07-01), Daigle et al.
patent: 4140213 (1979-02-01), Denison
Kosan Crisplant A/S
Valenza Joseph E.
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