It's for the automobile industry, which means send, send, send knives. For example, Vorschubanpassung is the choice of feed quantity and feed. Vorschubantrieb is a kind of feed conveying equipment.
Vorschub is used in phrases such as der Diktatur V. leisten, JMDM. Einer Sache v Leisten/(geh. auch:) tun。
The German-English Dictionary also explains it this way: advance, advance payment, what is partially paid before the total amount A.