Stacking device for a conveyor tray

Details Stacking device for a conveyor tray Stacking device for a conveyor tray

1996-12-16

2000-08-15

Krizek, Janice L.

Material or article handling

Apparatus for moving intersupporting articles into, within,...

Stack forming apparatus

414788, 414907, B65H 3134

Patent

active

061026514

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a stacking device for a conveyor tray.
Such a device is known per se and is used, for example, for the stacking of newspapers, magazines or the like in a so-called cross-assembler.
Such stacks of magazine copies when leaving the cross-assembler and during the transport to the compacting station have a tendency to slip or even topple, which is encouraged when the wire-stitching is applied to the magazines and by an uneven feeding. Stacking robots cannot be used here following the cross-assembler if a stack has slipped, which cannot be taken up.


SUMMARY OF THE INVENTION

For a device of the generic type, it is the object of the invention to have a more stable alignment for the piled-up stacks of items.
The above and other objects of the invention are accomplished in the context of a device for forming a stack of items to be transported on a tray in a conveying direction, for example, stacked newspapers, magazines or the like, wherein the stack is transported by a cross assembler to a compacting tunnel and wherein a blocking device for the stack is provided, and the blocking device has at least one charging device with charging electrodes arranged on both sides of the stack, wherein according to the invention, the charging device comprises means for elctrosdtatic charging of the items in the cross assembler.
In accordance with the teachings for the invention, the stack or partial stack is loaded during the stack formation in the cross-assembler. This has the advantage that the blocking is independent of the stack height. The stack blocking achieved in this way is particularly stable because the stack is also mechanically compacted during the blocking, meaning the mechanical force of pressure and the electrostatic forces complement each other.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present invention.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

For the embodiment according to the invention, a charging device is arranged in the cross-assembler 5. This cross-assembler has a tray designed as a lifting platform 30 for a (partial) stack 41 as well as flaps 31, 32, which can be folded from the displayed horizontal operating position to a vertical operating position. After a counted partial stack (with opened flaps 31, 32) has fallen into the stack guidance of the cross-assembler, the flaps are closed and the lifting platform 30 is raised, causing the partial stack 41 to be compacted. Pairs of electrodes 33, 34 or 35, 36 or 37, 38 or 39, 40 are provided in the side walls of the stack guidance and are shown diagrammatically. These are arranged at a distance to each other, such that the stack/partial stack 41 is located between them. These electrodes can be connected during the compacting--depending on the height of the stack 41--by means of which a charge flows into the partial stack 41 and the individual sides and the items themselves are charged. The pairs of electrodes are arranged in a mirror symmetry to a first (horizontal in the drawing) plane E1 as well as to a second (in the drawing vertical) plane E2.
The flaps 31, 32 as well as the lifting platform 30 on the one hand and the electrodes of the charging device on the other have either opposite polarity, or the flaps and the lifting platform can be connected to a ground. Following the compacting and loading operation, the lifting platform 30 with the blocked partial stack 41 moves downward. Flaps 31, 32 are subsequently folded up. The rotary table 42 rotates by 180.degree.. The previously counted (not shown) partial stack stored there above the cross assembler 5 drops onto the already loaded, blocked partial stack 41. The flaps 31, 32 close and the lifting platform 30 moves upward, so that a renewed compacting and blocking operation takes place with the cross assembled stack 41. Depending on the required, assembled number of copies of items or the height of the stack, the operation is repeated several times, until subsequently the stack is ejected. With a correspond

REFERENCES:
patent: 2640605 (1953-06-01), Chatterton
patent: 4657465 (1987-04-01), Aoki
patent: 5228373 (1993-07-01), Welsch
patent: 5868546 (1999-02-01), Hahne et al.

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