Process for regulating or controlling an injection molding machine
US5916501A · kind A · utility
Inventor
Key dates
| Filing date | Dec 18, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Dec 18, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2043/5833
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a control process speed stages are predetermined for the displacement of a movable unit and a nominal speed curve is derived therefrom. From the nominal speed curve a nominal path/time curve is calculated, from which, in turn, a position reference variable for the speed control is determined. At the time t.sub.i determined for the modification position s.sub.i where the speed level is to be changed for the successive speed stage, the speed of the movable unit is maintained until time t.sub.i' which is the moment at which the movable unit actually reaches the modification position s.sub.i. Upon this occurrence a triggering is initiated which equates the actual time t.sub.i' with the nominal time t.sub.i and which causes the nominal speed course to be superseded by a new nominal speed course progressing from the actual point in time t.sub.i'. The new nominal speed course corresponds to that portion of the superseded nominal speed course which progresses forwardly from the nominal time t.sub.i at which the movable unit should have reached the modification position s.sub.i.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.