Brother BM-2000 Instruction Manual page 46

Example 1: If the trailing end of the upper cloth is longer
The feed speed of the upper roller is too slow with respect to the feed speed of the lower roller.
Increase the feed speed of the upper roller.
Feed
direction
Example 2: If the trailing end of the lower cloth is longer
The feed speed of the lower roller is too slow with respect to the feed speed of the upper roller.
Reduce the feed speed of the lower roller.
Feed
42
Lower
cloth
Upper
cloth
Upper
cloth
Lower
cloth
BM-2000
5 SETTINGS BEFORE GLUING