Method for measuring and controlling the closing force of a plastic injection molding machine
US4832884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1986 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/7653
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
When the mold of plastic injection molding machine is locked, the closing force (K) is measured at the knuckle joint system during a predetermined number of operating cycles (Z). A mean value is computed from these actual value measurements (Si) and if it is within a predetermined tolerance zone (T) around a set-point value (So), no control intervention takes place. But if this mean value is outside of the tolerance zone (T) but in a control zone (R) limited by alarm limits (A), a control intervention takes place by stepwise changing the installed height of the mold until the actual value measured after each operating cycle is again within the tolerance zone (T). The measurement is repeated over another operating period (B); if those measurements stay within the control zone (R), a new mean value is computed only at the end of this operating period and a corresponding decision is made whether or not a control intervention should take place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.