Weighing scales – Weigher responsive material control – Discharge valve or gate
Reexamination Certificate
2000-10-10
2002-10-08
Gibson, Randy W. (Department: 2841)
Weighing scales
Weigher responsive material control
Discharge valve or gate
C177S108000, C222S181100, C222S181200, C222S505000, C222S508000, C222S077000
Reexamination Certificate
active
06462288
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to a metering device, and particularly to a metering device, which provides a weighing platform and is possible to sense and control the weight of delivered substances much more accurately.
2. Description of Related Art:
A prior art of metering device as shown in
FIG. 1
provides a feeding funnel a′ being disposed above a series of feeding device b′ and weighed substances are fed to the feeding devices b′ sequentially through the feeding funnel a′. Then, the substances are sent out by way of the feeding device and fall into a scale barrel
10
′. A weight part
20
′ at a lateral side of the scale barrel
10
′ senses the weight of the weighed substances in the scale barrel
10
′. When a predetermined value of weight set up in the weight part
20
′ is going to reach, the feeding speed may slow down to deliver a very small amount of weighed substance or single weighed substance till the predetermined value exactly reached. At this time, a movable box plate of the shut mechanism c′ may open to admit the weighed substances falling down to a packing bag so as to complete the operation of metering. Referring to
FIG. 2
, a micro-feeding mechanism c′ is mounted beside or above a feeding device b′. When the weight part
20
′ has sensed the predetermined value is going to reach, the feeding device b′ stops to deliver the weighed substances such that the micro-feeding mechanism c′ then send out a very small amount of weighed substance or single weighed substance slowly. When the predetermined value is exactly reached, the micro-feeding mechanism stops running and the movable box plate
12
of the shut mechanism
30
′ admits the weighed substances falling down to the packing bag so as to complete the operation of metering.
Referring to
FIG. 3
, a further conventional metering device provides a rotating threaded rod b
1
′ in the feeding device b′ to send weighed substances into the scale barrel
10
′. When the weight part
20
′ has sensed the predetermined value is going to reach, the rotating speed of the threaded rod is slow down to send out a very small amount of weighed substance. When the predetermined value is exactly reached, the threaded rod stops rotating and the movable box plate
12
of the shut mechanism
30
′ admits the weighed substances falling down to the packing bag so as to complete the operation of metering.
It can be understood that there is a large difference of elevation between the scale barrel
10
′ and the micro-feeding mechanism c′ and/or the feeding device b′ for the prior art. That is, weighed substances falling down from the scale barrel
10
′ to the micro-feeding mechanism and/or the feeding device b′ takes a long way. Hence, it may result in a long responding time for measuring weight and a greater acceleration of gravity of the weighed substances. Moreover, these factors affect the accuracy of weight sensing performed by the weight part
20
′ substantially.
SUMMARY OF THE INVENTION
A main object of the present invention is to provide a metering device, with which a weighing platform at least at a lateral side of the scale barrel is mounted to touch falling weighed substances before the scale barrel receiving the weighed substances. Therefore, a metering operation can be accurately performed and easily controlled.
Another object of the present invention is to provide a metering device, with which a moving rod in the shut mechanism has both ends thereof be pivotally attached by a connecting rod respectively extending along lateral outer sides of the movable box plate. A free end of the connecting rod is provided a groove to fit with a projecting piece on a stationary box plate while the movable box plate is in a state of closing to keep the movable box plate from moving accidentally.
REFERENCES:
patent: 3540538 (1970-11-01), Connors et al.
patent: 3578094 (1971-05-01), Henry et al.
patent: 4393950 (1983-07-01), Klopfenstein et al.
patent: 4635831 (1987-01-01), Kinoshia
patent: 4644786 (1987-02-01), Jacobsen
patent: 4693355 (1987-09-01), Bochi et al.
patent: 5191947 (1993-03-01), Peterson
patent: 5379923 (1995-01-01), Sagastegui et al.
patent: 5637836 (1997-06-01), Nakagawa et al.
patent: 6188029 (2001-02-01), Miyamoto et al.
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