Cutting – By endless band or chain knife – Including plural cutting zones
Patent
1983-10-19
1986-03-11
Meister, James M.
Cutting
By endless band or chain knife
Including plural cutting zones
83808, 83820, 83871, B23D 5508
Patent
active
045746753
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a band-saw including several blades for cutting blocks, e.g. frozen fish-blocks, into several slices.
In the manufacturing of e.g. fish-stick, one starts from big frozen fish-blocks (about 0.6.times.0.25.times.0.5 m) which are divided in three long stocks, called loaves. Those loaves are sliced longitudinally into several slices, usually 3-6, which finally are cut transversely in order to produce fish-sticks or bigger portion pieces.
The first cutting of the block is usually made by means of a double band-saw, i.e. two identical band-saws positioned beside each other, whereby the fish-block is fed perpendicular to the saw blades. In this way, the cutting is made in a single operation. Alternately, the cutting of the block into loaves is made by a single saw in several operations.
The final sawing from slices to portion bits is usually made by feeding the slices transversely over several disc saw blades, which are spaced from each other a distance corresponding to the width of the desire fishpin or portion piece. Also this partition can be made in a single operation.
The sawing operation which constitutes a problem today is the slicing of the loaves into slices.
It is not possible to make this slicing in the same manner as the partition of the portion pieces, i.e. to use several parallel disc saw blades. If so, sawing depth must be at least equal to the width of the loaf, i.e. between 8 and 9 cm, and in order to avoid unnecessary spill and in order to achieve a fine cutting surface, which is essential for the appearance of the final product, the saw blade must be very thin, about 0.4 mm. Such a thin blade would vibrate very heavily, would not provide high precision, and would not withstand the high loads occurring in the sawing of deep-frozen blocks.
Thus, the use of a band-saw is ultimative. However, the above-mentioned double band-saw will give a maximum of three slices in the same operation.
This slicing operation is today performed by slicing each single slice in a single band-saw. This means that in order to achieve five slices, the loaf must be fed through the saw four times, and so on.
Thus, the operation cannot be included in a fully automatic chain, since it has to be performed manually, which is very time consuming and expensive.
According to another known method, the loaves are sliced by means of a device comprising five separate band-saws positioned after each other. However, this device has several drawbacks. It is about five meters long and is thus very bulky, which makes it unsuitable for smaller industries. The investment costs are high and the time and expenses for cleaning and service are considerable. Moreover the sawing spill must be collected at several positions.
The object of the present invention is to provide a band-saw for slicing a desired number of slices in a single operation. Such a band-saw can be included in a fully automatic chain.
Another object of the present invention is to provide a band-saw which lacks the above-mentioned drawbacks.
Said objects are achieved by a band-saw for slicing a block of e.g. deep-frozen fish, into slices, wherein two drums are arranged on a support. At least two endless band-saw blades are mounted on said drum close to and adjacent to each other. At least one guide for each saw blade is positioned between the drums and is adapted to twist each saw blade a certain angle in relation to the axis of the drum. The guide comprises inserts of a hard metal which guides the saw blades so that each saw blade is completely parallel with the adjacent saw blade.
Further objects and advantages of the invention will become apparent from the description below of a preferred embodiment of the invention with reference to the appended drawings.
FIG. 1 is a front perspective view of the band-saw with the front cover removed.
FIG. 2 is a perspective view corresponding to FIG. 1 wherein the feeding direction of the fish block is shown.
FIG. 3 is an elevational view and shows the guiding unit for the saw blades in detail.
FIG. 4 is a s
REFERENCES:
patent: 283157 (1883-08-01), Smith
patent: 1322743 (1919-11-01), Wright
patent: 1855706 (1932-04-01), Criner et al.
patent: 2126987 (1938-08-01), Criner
patent: 2261816 (1941-11-01), Williams
patent: 2297710 (1942-10-01), Kottmann et al.
patent: 2705510 (1955-04-01), Stocke
patent: 3534647 (1970-10-01), Mills
Meister James M.
Northern Food-Line Machines K.S.
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