US 4,928,473 AGranted

Device for automatically filling and packing predetermined weight of product in containers

AssigneeYamato Scale Company, Limited

InventorsTakeyoshi Nagao, Toru Kohashi

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Abstract

A kind of automatic rotary weighing and packing machine having a plurality of weighers radially or annularly arranged on a circular rotary table for automatically effecting such processes as filling of product, weighing and judgement at respective positions around the table, which is especially suitable in the case where the product to be packed is sticky granular or powdered bulk material and the packing container is a bag or the like. This machine uses no weigh hopper or bucket in which sticky product is liable to remain to cause weight error, and the packing container is held by a holding mechanism attached to each weigher and directly filled with product, which is then weighed and sealed. A fixed amount feeding device is used for feeding product into the container and its throughput is controlled based upon the result of a subsequent weighment for keeping the weight of product packed in each container always at a predetermined value.

Claims17

Dependent claims

A device for automatically filling and packing a predetermined weight of product in containers, comprising a first rotary table including a plurality of weighing heads arranged at equal intervals around said table, each weighing head including weight detecting elements and a bag-like container holding mechanism, and a plurality of operating means disposed at first to sixth operating locations arranged in this order around said first rotary table for applying specific treatments to each weighing heads passing said locations;

characterized by said operating means comprising:
container feeding means for feeding a bag-like container to said holding mechanism to be held thereby when each of said weighing heads arrives at said first operating location,
memory means for reading and storing the weight of said container detected by said weight detecting elements when each weighing head arrives at said second operating location,
product feeding means for filling said container with a predetermined target weight of product when each weighing head arrives at said third operating location,
arithmetic means for subtracting the stored weight of said container from the weight of the filled container detected by said weight detecting elements to calculate the net weight of said product for comparing said net weight with a predetermined allowable range to judge the acceptability thereof and for storing the result of judgement when each weighing head arrives at said fourth operating location,
feed control means for adjusting the amount of feed of said product feeding means based upon the deviation of said net weight from said target weight while each weighing head is at said fourth operating location,
sealing means for sealing the opening of said container to complete a packed product when each weighing head arrives at said fifth operating location, and
delivery means for discharging said packed product from said holding mechanism and, if not acceptable, removing said product based upon said stored result of judgement when each said weighing head arrives at said sixth operating location.

5 more elements

A device for filling bag-like containers with a predetermined amount of product, said device comprising rotary table means, a plurality of heads arranged at spaced intervals around said rotary table means, each head comprising holding means for holding a bag-like container and at least some heads of said plurality of heads further comprising weighing means for detecting the weight of said bag-like container and its contents, and a plurality of operating means disposed at stations arranged around said rotary table means for performing a plurality of sequential operations in connection with each bag-like container held by said holding means as said rotary table means rotates to move the bag-like container in sequence from one station to the next, said plurality of operating means comprising, in sequence;

container feeding means for feeding a bag-like container to a head having both said holding means and said weighing means, whereupon said holding means is operable to hold said bag-like container,
means for reading and storing the weight of said bag-like container as detected by said weighing means,
product feeding means for loading a predetermined amount of product into said bag-like container through an open mouth of the container,
arithmetic means for judging whether the combined weight of said bag-like container and product therein falls within an acceptable range of weight,
sealing means for sealingly closing the mouth of the bag-like container, said holding means thereafter being adapted to release said container, and
delivery means for delivery of a released container to a first destination if the container and product therein falls within said acceptable weight range and to a second destination if the container and product therein falls outside of said acceptable weight range.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/364,259Filed 9 Jun 1989
Priority: JP 63-15305820 Jun 1988
Granted: 29 May 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01G 15/02
Arrangements for check-weighing of materials dispensed into removable containers: with provision for adding or removing a make-up quantity of…
B65B 1/32
Devices or methods for controlling or determining the quantity or quality or the material fed or filled: by weighing
B65B 43/465
Using grippers: for bags
G01G 13/04
Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism: involving…