JPS5828532B2 - automatic weighing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic weighing machine using weight combination weighing.

Figure 1 shows an automatic weighing machine that applies the weighing method of the first model (Japanese Patent Publication No. 54-14946), in which objects to be weighed are distributed from a supply conveyor A to a conveyor A that is rotated in a fixed direction by a motor B, and then fall onto a disc C. Then, by centrifugal force, the shutter D is opened at the appropriate time from multiple outlets on the circumference, and the parts are distributed to the parts feeder F via the chute E.
The materials are conveyed to the exit while being arranged in a row, and the shutter H is opened at the appropriate time in response to a signal from the weighing machine G, and the materials are dropped into the pool hopper (2) located below, where they are once pooled.

This is put into a weighing hopper J using an appropriate conveyance mechanism, weighed individually by a weighing machine G, and the actual measured values are combined and calculated, and the weighing hopper J corresponding to a predetermined weight or a combination close to it is opened, The unweighed items were collected by a discharge chute K into a timing hopper L and put into a container linked to a packaging machine or the like.

However, in the above-mentioned automatic weighing machine, the sorting mechanism and alignment mechanism are separated, which makes the mechanism complex, and it is difficult to weigh objects that cannot be weighed (e.g. easily scratched objects, long objects, powder). etc)
There are many types of weighing machines, and the scope of use for objects to be measured is limited because they are designed for special purpose machines or objects with similar shapes.

In addition, the total height of the supply conveyor A increases due to the provision of the chute E, which causes a head error, and prevents dust-proofing and waterproofing, which adversely affects the parts feeder F and prevents smooth alignment.

Furthermore, since the journey to the weighing hopper J is long, the weighing object may be damaged or soiled.

In view of the above-mentioned drawbacks of the above-mentioned automatic weighing machine, this invention has been improved and eliminated, and the construction of this invention will be described below with reference to embodiments shown in the drawings.

Figure 2 shows a schematic diagram of the automatic weighing machine of this invention.
1 is a supply conveyor, 2 is a supply feeder, 3 is a parts feeder, 4 is a weighing hopper, 5 is a weighing machine, 6 is a discharge chute, and 7 is a timing hopper.

The supply feeder 2 is supplied with objects to be weighed by a supply conveyor 1.

The object to be weighed in the supply feeder 2 is vibrated by the pie break 8 and sent to the tip, and is supplied to the parts feeder 3 in appropriate amounts.

The parts feeder 3 takes the form of a hanging type, and balls 9 for supply alignment are installed at its lower part.

A plurality of outlets of the object to be weighed are provided on the circumference of this ball 9,
A shutter 10 is installed in each of them, and the shutter 10 is opened at a predetermined time by a signal from the weighing machine 5.

As shown in FIG. 3, a plurality of weighing hoppers 4 are installed circumferentially below the outer periphery of the ball 9, and objects to be weighed are introduced from above the ball 9.

Each weighing hopper 4 is individually associated with the shutter 10, and each shutter 10 is opened and closed when the corresponding weighing hopper 4 finishes discharging the object to be weighed and becomes empty. After supplying objects to be weighed by a set number of objects or approximately a set weight, the container is closed.

The weighing machine 5 individually weighs the objects to be weighed in the corresponding weighing hopper 4, and calculates the weight value by an electronic calculation circuit (not shown).
is supplied as input, all combinations in one weighing are calculated in a very short time by an electronic calculation circuit, and the weighing hopper 4 of the weighing machine 5 corresponding to a predetermined weight or the combination closest to it is released. do.

Since it is a combination of the weights contained in each weighing hopper 4 in this way, each weighing machine 5 can be set individually, and as long as the weight signal of the contents of each weighing machine 5 is output, it will automatically weigh the set weight. can be selected and retrieved.

Furthermore, since this is a combination weighing method, the number of heads for each weighing machine 5 must be determined based on the number of grams of allowable error for the set weight.

The higher the number of heads, the higher the accuracy can be obtained.

The discharge chute 6 is configured to collect the objects to be weighed discharged from each of the weighing hoppers 4 into one location at the bottom, that is, the timing hopper 7.

The timing hopper 1 is opened at a predetermined time to discharge the collected objects to be weighed into a container linked to a packaging machine or the like located below.

In the above configuration, the operation of the automatic weighing machine according to the present invention will be explained as follows.

A supply conveyor 1 feeds the object to be weighed onto a supply feeder 2 in pieces.

The object to be weighed on the supply feeder 2 is conveyed to the tip by vibration, and is thrown onto the ball 9 of the parts feeder 3 in appropriate amounts.

The objects to be weighed on the ball 9 are conveyed from the center of the ball 9 to the outer periphery by the torsional reciprocating vibration of the parts feeder 3, sorted, aligned, and fed into each weighing hopper 4 from each outlet. They are individually weighed by the weighing machine 5, and all combinations for one measurement are calculated in a short time by an electronic calculation circuit. When all combinations have been calculated, the weight corresponding to the set weight or the combination closest to it is weighed. Only the weighing hopper 4 of the weighing machine 5 is opened, and the objects to be weighed are collected by the discharge chute 6 into the timing hopper 7 and thrown into a container.

As explained above, the present invention supplies the objects to be weighed from a supply mechanism that distributes and supplies the objects to be weighed to each of a plurality of weighing hoppers arranged circumferentially at the lower part of the outer periphery of the supply mechanism. The weight of each object to be weighed supplied to the weighing hopper is weighed, calculations are made for each different combination of actual measured values, each calculated value is compared with the required predetermined weight, and a weight of the predetermined weight or a weight close to it is calculated. I made it so that I could get the combination,
In distribution, feeding and alignment can be performed on the balls at once, and the mechanism is very simple, and it has the advantage that a feeding device with a wide width and a wide range of application can be easily designed.

In addition, the parts feeder is of a hanging type, which lowers the overall height of the supply conveyor, making it easier to arrange other mechanics located at the bowl, and making it easier to perform cleaning work at a relatively low position. The journey from the point to the discharge chute is shortened, and the object to be weighed is not damaged or soiled.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the first weight combination type automatic weighing machine, Figure 2
The figure is a schematic diagram of an automatic weighing machine of the present invention, and FIG. 3 is a plan view of the main part of the present invention. 1... Supply conveyor, 2... Supply feeder, 3... Parts feeder, 4...
Weighing hopper, 5... Weighing machine, 6... Discharge chute, 7... Timing hopper.

Claims (1)

[Claims] 1. To distribute the objects to be weighed, a supply mechanism supplies the broken objects to each of the plurality of weighing hoppers arranged circumferentially at the lower part of the outer periphery of the supplying mechanism. The weight of each object to be weighed is measured, calculations are made for each different combination of actual measured values, and each calculated value is compared with a required predetermined weight to obtain a combination of predetermined weights or weights close to them. An automatic weighing machine characterized by: