US 4,074,507 A · Bag filling machine for powdery material

Abstract

A machine is disclosed to bag powdery material wherein primary and secondary preconditioning chambers are used, having a volume sufficient to give enough time for the powdery material to become de-aerated. This de-aerated powdery material is then supplied to a bulk filling station and a dribble filling station. Bags spouted at the bulk filling station are filled to about 90 percent of their normal capacity and are then moved laterally to the dribble filling station whereat the bags are rapidly filled to a weight close to the desired exact weight and by automatic speed changing means filled to exact weight at a slower rate. The bags are supported at the top by grippers at both filling stations with the calibrated weight scale being actuated by weight on the grippers at the dribble filling station. An auger at the bulk filling station forces the powdery material down into a generally closed bag to force the bag open by the incoming material to thus keep air out of the bag as much as possible. This saves time in the filling of the bags because time need not be spent waiting for the air to escape out of the powdery material in the bag before the bag can be closed and sealed. A vacuum probe may be inserted into the bag while being filled to help this de-aeration. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Claims26

Dependent claims

A bag machine comprising in combination,

means to supply bags sequentially to said machine,
means to open an openable end of each said bag,
primary bulk filling means to fill at a first rate each successive bag with powdery material to a major portion of its nominal maximum capacity of material,
secondary filling means,
first means to shift said majority filled bag to said secondary filling means,
means at said secondary filling means to fill said sequentially supplied bags at a second rate,
means to support any said bag near the top thereof,
calibration means at said secondary filling means connected to said support means to terminate the secondary fill of the bags upon reaching a predetermined calibrated value,
closing means,
second means to shift said filled bag to said closing means,
and means at said closing means to close said filled bag.

8 more elements

Dependencies are inferred from the claim text.

Bag filling machine for powdery material

Life of this patent

Bag filling machine for powdery material

Life of this patent

Abstract

Claims26