Material or article handling – Apparatus for moving intersupporting articles into – within,... – Stack forming apparatus
Patent
1995-10-11
1997-12-02
Krizek, Janice L.
Material or article handling
Apparatus for moving intersupporting articles into, within,...
Stack forming apparatus
271215, 271290, 271294, 414786, 4147907, 4147982, B65H 2958
Patent
active
056928777
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a method for stacking of thin sheets and a device for stacking of thin sheets according to the method. The sheets can be made from paper, plastic film or the like. The invention is primarily intended to be used in connection with print-outs in computer centres delivering a continuous, rapid and lengthy flow of paper sheets.
At larger computer centres there is often an almost continuous production of print-outs. The printers used for this purpose have a great capacity and the speed of the paper can be up to 1 meter per second, corresponding to 4-6 sheets per second.
The printed papers are collected in stacks for further handling. A suitable height of a stack is up to 200 mm, which means that each such stack contains more or less numerous sets of print-outs for different adressees. In order to facilitate the further handling those parts of the stack which are intended for a certain adressee should be displaced relative to the adjacent parts of the stack. Separating stacks by addressee is particularly important with the use of certain high speed printing devices that produce a high speed continuous printed sheet output which is subsequently split up into separate sheets, possibly intended for different addressees. In order to facilitate this handling, the print-outs often have a bar code, either on each separate sheet or on the first and possibly the last paper for an addressee, whereupon the continuous paper sheets can be controlled by impulses which are received directly from the printer or by optical reading of the bar codes. It is then important that there is no further displacement of the paper in relation to other papers.
The invention will below be described more in detail with reference to the embodiment shown in the accompanying FIGURE.
The device shown in the FIGURE has two stackers 2, 20 for collecting of separate sheets to stacks of suitable size. The papers arrive to the device on a conveyer 1 and are received in a paper switch 25 where the paper is directed using air. The paper directed upwards is carried on to the upper stacker 2 and papers directed downwards are brought to the lower stacker 20 by the conveyer 3. The two stackers are of identical design and function. The paper is brought into the stack on a conveyer 4 comprising a number of parallel bands arranged side by side, which are controlled by pulley wheels and supporting wheels 5, 6, 7, 8. The papers are delivered from the conveyer 4 in the slit between the paper stack 16 and a second conveyer 9 which also comprises a number of parallel bands arranged sidewise passing over pulley wheels 10 and 24. The paper stack is supported by several supports 14 each having a resilient support edge 17 towards the paper stack. The stacker can be turned and tilted around an axis 26 at right angle to the plane of the FIGURE.
A paper incoming to the stacker from the conveyer 1 passes the paper switch 25 and it directs the paper towards the upper stacker 2. The paper is caught onto the conveyer bands 4 and leave these after passing under the pulley wheels 7. The paper is then directed at an angle inwards towards the paper stack 16 and is brought up so that it passes in between the stack and the conveyer bands 9. These bands pass over-upper pulley wheels 11 and lower pulley wheels 24. The lower pulley wheels 24 are mounted onto a shaft which is mounted onto arms extending up to the shaft 10 through the centre of the upper pulley wheels 11. The lower pulley wheels 24 can swing freely in this suspension device and if the rear supports 14 are in a certain position the pulley wheels 24 move gradually when further paper is delivered to the stack. In connection with this movement a position switch 15 is affected by the pivoting arrangement of the pulley wheels 24. The supports 14 are arranged so that they can be displaced in a direction towards or away from the conveyer bands 9. This displacement arrangement is effected by the position switch 15 and as the paper stack increases the supports 14 are moved away from the driving arran
REFERENCES:
patent: 3236162 (1966-02-01), Reist
patent: 3343690 (1967-09-01), Dean
patent: 3719266 (1973-03-01), Korn et al.
patent: 3884345 (1975-05-01), Tokuno
patent: 4055339 (1977-10-01), Looney
Ingenjorsfirman Rationella Maskiner AB
Krizek Janice L.
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