Patent ID: 11969836
Assignee: ILLINOIS TOOL WORKS INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 6:
7. A reciprocating welding wire feed system, comprising:
a first drive roll configured to contact a welding wire;
a second drive roll disposed adjacent to the first drive roll on a same side of the welding wire, wherein the second drive roll is configured to contact the welding wire,
a first expandable roll disposed opposite the first drive roll relative to the welding wire; and
a second expandable roll disposed opposite the second drive roll relative to the welding wire;
wherein the first expandable roll is configured to expand radially upon application of an electrical signal to the first expandable roll, and the second expandable roll is configured to expand radially upon application of the electrical signal to the second expandable roll.