Free transport for settling and singling of letters
View Patent ↗The disclosed concepts provide for a method and apparatus for processing batched items, which may comprise a multitude of flats, e.g., letters. The individual items are conveyed in a row and abut against a band conveyor with one edge. They are at least partially resting against and overlapping each other in a shingle-like manner. The overlapping flats are further separated (fanned out) by guiding mechanisms on each side of the overlapping flats that accelerate and decelerate as necessary.
1. A method for processing a batch comprising individual flat items, where the individual flat items are at least partially resting against each other and are overlapping each other in a shingled array, and where the overlapping individual flat items are further separated by the following process steps:
conveying the batch on a bottom edge by way of a band conveyor at a conveyance speed;
decelerating a first side of the batch relative to the conveyance speed;
accelerating a second side of the batch relative to the conveyance speed by way of a side band to form a row of individual flat items in the shingled array; and
separating an individual flat item from the batch,
wherein the side band is driven at a higher speed than the conveyance speed of the band conveyor.
2. The method according to claim 1 , further comprising the step of feeding the separated individual flat item for a single pull-off.
3. The method according to claim 1 , wherein the individual flat item is conveyed standing on edge.
4. The method according to claim 1 , further comprising the step of setting parameters of deceleration or acceleration or transport speed such that an individual flat item at the head of the row is separated from an individual flat item in the row of at least a predetermined distance.
5. The method according to claim 1 wherein the batch is transported freely on the at least one edge without lateral clamping.
6. The method according to claim 1 , further comprising the steps of
conveying a plurality of batches in a heap;
separating each of the plurality of batches from the heap; and
orientating each of the plurality of batches on an edge.
7. The method according to claim 6 , further comprising the step of setting the conveyance speed such that that upstanding individual flat items are tipped onto their longitudinal edge.
8. A device for processing a batch comprising individual flat items, comprising:
a band conveyor for conveying the batch standing on edge;
a transport channel formed by:
a brake mechanism on a first side,
an acceleration mechanism on a second side, said acceleration mechanism comprising a side band driven at a higher speed than a conveying speed of the band conveyor, and
the band conveyor on a third side of the transport channel, wherein the individual flat items of the batch are fanned out through the conveying speed of the band conveyor, braking of the brake mechanism and accelerating of the acceleration mechanism to form a row of individual flat items; and
a chute, over which the batch is delivered, in which the individual flat items lying heaped on top of each other fall into a trench, wherein the individual flat items hit the bottom of the trench on one edge, and wherein the trench has walls, which hold the individual flat items in the standing position, and where there is a band conveyor at the bottom of the trench, which conveys the standing individual flat items along a bottom edge across the trench to the transport channel, wherein the band conveyor inclines at an angle of more than 30° at the bottom of the trench relative to a horizontal surface positioned below the band conveyor.
9. The device according to claim 8 , further comprising a single pull-off positioned to separate an individual flat item at the head of the row.
10. The device according to claim 8 , further comprising a free transport portion forming at least part of the transport channel, wherein the brake mechanism and the acceleration mechanism are separated by a distance such that individual items of the flat batch may be conveyed by the band conveyor without substantial influence from the brake mechanism or the acceleration mechanism.
11. The device according to claim 8 , wherein the brake mechanism comprises a wall having an adhesion factor against which the individual flat items on one side of the batch abut.
12. The device according to claim 8 , wherein the brake mechanism comprises a side band against which the individual flat item on one side of the batch abut, where the side band moves at a slower speed as the band conveyor but in the same direction.
13. The device according to claim 8 , wherein the acceleration mechanism comprises a drive device for driving the side band running in the same direction of the band conveyor but at the higher speed, wherein the individual flat item abutting against the drive device are accelerated.
14. The device according to claim 8 , wherein the acceleration mechanism and brake mechanism are arranged at an acute angle and converge in funnel-form in the transport direction.
15. The device according to claim 14 , wherein the funnel-form converges to a separation distance of less than three individual items.
16. The device according to claim 8 , wherein
the brake mechanism is seated shiftably or pivoted at right angle towards the transport direction, and
the brake mechanism is loaded with a spring force in the direction of the band conveyor.
17. The device according to claim 8 , wherein the length of the transport channel is sufficient to ensure a settling of the individual flat items before being inserted into the transport channel.
18. A device comprising:
a continuous chute comprising an upper chamfer directly connected to and in-line with a lower chamfer, the upper chamfer having a first inclination less than a second inclination of the lower chamfer, the chute adapted to deliver a batch of individual flat items, in which the individual flat items are lying heaped on top of each other;
a trench positioned below the lower chamfer of the chute, adapted to receive the individual flat items from the lower chamfer of the chute on one edge, wherein the trench includes side walls which hold the individual items in a standing position; and
a band conveyor being associated with the trench and the band conveyor being inclined at an angle of more than 30° relative to a horizontal surface, the band conveyor adapted to convey the standing individual flat items along a bottom edge across the trench to a transport channel, wherein the horizontal surface is positioned below the band conveyor.