In production, "Band" is usually a conveyor. "Einschleusen" would be s.th. like "feed" (cf. Muret-Sanders).

Got a number of hits on "feed conveyor" (in-feed and out-feed, depending on function - einschleusen would definitely be in-feed), also "feeder conveyor", see below:
Material is pushed onto the in-feed conveyor by a front-end loader.
www.allancompany.com/sandiego/page3.html

Feeder conveyor having opposed grippers (17 patents)
www.delphion.com/patlist?&xcl=209&upc_ob=c

Typical out-feed conveyor common in many applications. An SCS Synchronisation Encoder attached to this conveyor provides positional data to ...
www.appliedautomation.com.au/applications-pcm-19.htm

CPT Woodworking Machinery - SC-230 SERIES - Precision cut- ...
... PERFORMANCE SERVO MOTOR A high performance AC servo motor drives the in-feed conveyor belt, allowing precise positioning of the workpiece. TILTED INFEED ROLLER ...
www.c-p-t.com/sc230.html

Another possibility might be "supply conveyor"; see below:
Hisec MFD Media Assembly Machine (x 2) - The hub, discharged by the ball feeder is transferred to the glue dispenser table and glued. The media supplied to the supply conveyor by the transport is discharged to the supply conveyor by the transport is bonded with the hub and discharged to the discharge conveyor - 72pcs/min
www.eyecote.com/mfd/convert2.htm

Excerpts from OSHA Ergonomic Report: Truck Transportation and ...
... Redesign the sort station so it has 3 conveyor levels on the other side of the aisle away from the incoming supply conveyor. Two of the conveyors could be in ...
www.osha-slc.gov/SLTC/ergonomics/ergonomicreports_pub/up991... up991012.html

Excerpts from OSHA Ergonomic Report: Packing Filled Bottles ...
... grips with the wrist in a deviated posture, to move bottles from the supply conveyor to the packing box. Deviating the wrist while performing frequent and/or ...
www.osha-slc.gov/SLTC/ergonomics/ergonomicreports_pub/dp940... - 34k

See what works within your context. Good luck.