Linear:

These batch weighing machines feed product directly into a weigh bucket and controls the feed rate until the target weight is achieved.    This target is then discharged and the process is repeated. Weigh buckets on this type of machine are usually larger then the Target weight required, although employing the "Double Dump" concept  (on a multi-head machine) allows for a discharge of twice this bucket size.    The feeding may be achieved using vibratory feeders or speed controlled belts.

The Compu-Weigh Linear Batch weighing machine can theoretically have up to 255 weigh heads. (More heads = More Speed)            The machine uses industry standard vibratory feeder drivers, which are voltage controlled.  Two feeders are side by side and act as fast and slow feeders into a single weigh bucket.  The weigh bucket is discharged at the completion of the weigh cycle by a pneumatic cylinder activated by a foot pedal / Feather Switch or automated machinery.

The frame is constructed of 50mm 316 SS square tubing.  All contact parts are food grade stainless steel or food grade rubber.  The supply hopper is connected to the vibratory feeders using rubber sleeves to prevent product spillage and transfer of vibration. These feeders are then mounted on anti-vibration cushions.

The machine is controlled by "off the shelf"  industrial compatible computer boards and operator interface is through a small keypad and a VGA colour screen or an LCD colour touch screen.

When an operator selects the desired product, all the weigh heads are automatically set up with the correct parameters obtained from a Compact Flash Disk.

After the parameters are set, starting the machine sets both feeders going to full vibration level.  As the weight increases the vibration levels are reduced automatically, until only the slow feeder vibrates at a decreasing rate.  Hundreds of vibration changes are made per cycle.  Target weight is made with the slowest possible feed rate for that product.  When target weight is reached, the head waits for permission to discharge the weigh bucket.

Calibration is a single keystroke operation for zeroing of an empty weigh bucket, and spanning using standard test weights or product.  Tuning of product files is done once at the customer's premises after which the " Auto-Tuning" makes adjustments to adhere to machine speed and accuracy.  No operator tuning is required for accuracy or speed.

Grading: 

These machines are purpose designed for the customers application. Items are typically graded by weight into different grades. This has been done on Abelone and Fruit.

Check Weighing:

We only manufacture Static check weighing machines. However the rate of statically weighing items can be as high as 50 p/min. These are typically used to weigh cartons to confirm the contents are complete.

Combination:

This method feeds a portion of the total target into a number of weigh buckets, and then calculates which buckets (when combined) will  discharge the most accurate combination. Similar to linear machines, the feeding may be by vibratory trays or speed controlled belts. In addition to manufacturing special purpose combination weighing machines, Compu-Weigh also converts combination weighing machines from other manufacturers. For details on conversions see  Combo.pdf