Material or article handling – Apparatus for moving intersupporting articles into – within,... – Unstacking apparatus
Patent
1995-05-02
1997-06-24
Merritt, Karen B.
Material or article handling
Apparatus for moving intersupporting articles into, within,...
Unstacking apparatus
4147966, 4147967, 4147968, B65H 324
Patent
active
056412665
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for feeding a part of a stack, or a substack, formed by one or multiple sheets from the sheet stack. The invention also concerns an apparatus implementing the method according to present invention.
BACKGROUND OF THE INVENTION
Sheets are conventionally fed to a cut saw individually, after which the cut sheets are stacked on a stacking table into a stack for subsequent trimming sawing. The trimming sawing is performed in substacks of multiple stacked sheets. When sawing thin sheets, the feed system of sheets to a sawing line has generally been a limiting factor for the capacity of the sawing line.
To overcome the sheet feed problem from forming a capacity limiting factor, methods have been developed for feeding multiple sheets simultaneously, even a full stack at a time from the sheet stack to the sawing line. However, such methods are generally applicable to thick sheets only.
SUMMARY OF THE INVENTION
It is an object of the present invention to achieve a method in which even thin sheets can be fed reliably as substacks to the cutting saw. The characterizing properties of the method and apparatus according to the invention are disclosed in the annexed claims.
The method according to the invention offers several benefits over conventional techniques. The implementation according to the present method makes it possible to feed multiple thin sheets in a substack to the cutting saw. Longitudinal deviations from parallelity of edges or defects on the leading edge of the sheet substack do not hamper the feed method according to the invention. Only a single measurement sensor location is required for the measurement of the sheet substack being fed.
BRIEF DESCRIPTION OF DRAWINGS
In the following the invention is examined by way of an exemplifying embodiment with reference to the annexed drawings in which
FIG. 1 shows a top view of a sawing line layout for a cutting saw.
FIG. 2 shows a side view of a feed apparatus operating by virtue of the method according to the invention.
FIG. 3 shows a simplified diagram of the back gauge and the sheet stack end at the back gauge side.
FIG. 4 shows another simplified diagram of the back gauge and the sheet stack end at the back gauge side.
FIG. 5 shows a simplified diagram of a pusher of the feed station.
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, a cutting saw line is shown. During the operation of the line, a sheet substack is transferred by means of a feed conveyor 1 to a feed station 2, wherefrom the sheets are fed either individually or in substacks via a stacking table 3 to cutting saw sections 4, 5. Subsequent to sawing, the sheets are transferred to a stacking station 6 and further to an outfeed conveyor 7.
With reference to FIG. 2 the feed station 2 is illustrated having a sheet stack 8 piled onto a lift table 9 or equivalent apparatus. The lift table 9 is adapted to be vertically movable along a frame 10 of the feed station. The lift table upward/downward movement is implemented by means of lift machinery. The lift machinery comprises chains 17 attached at their one ends to the lift table 9, and passing over chain sprockets 18, at their other ends to an lift machinery 16, whose movement is controlled to implement the upward/downward movement of the lift table 9. The lifting movement can be implemented by means of a different arrangement such as a scissor-lift platform. The feed station is provided with a pusher carriage 11 which is movable on horizontal rails by means of a mechanical, hydraulic or pneumatic actuator machinery. A back gauge 12 is arranged to the opposite end of the sheet stack relative to the pusher 11. The pushing force delivered by the pusher 11 is controllable. Advantageously, the force control function is implemented by means of a pressure-limiting valve in a pneumatic and hydraulic system, while a motor torque limiter is employed in a mechanical system.
The pusher 11 pushes a desired number of sheets from the sheet stack 8 over the back gauge 12 into the nip between pinch rollers 13
REFERENCES:
patent: 3744649 (1973-07-01), Ward, Jr.
patent: 3844426 (1974-10-01), Campbell
patent: 3908836 (1975-09-01), Ikeda
patent: 4726724 (1988-02-01), Jenkner
patent: 4988265 (1991-01-01), Schwab et al.
patent: 5018940 (1991-05-01), Hognestad et al.
patent: 5205705 (1993-04-01), Jenkner
patent: 5443356 (1995-08-01), Naldi
Merritt Karen B.
Morse Gregory A.
Sunds Defibrator Panelhandling Oy
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