| 摘要 |
An automatic seam welder (10) for thermoplastic material includes a single piece frame (12) riding on two drive wheels (18, 22) and a caster (20), the drive wheels (18, 22) being driven by a drive motor (52) through a helical spring clutch (56). A heat gun (14) is gimbal mounted to the frame (12) and includes a blower, heating element (36), and shaped foot (38) to direct hot air between overlapped thermoplastic sheets. A thermocouple (40) in the foot (38) directly senses the air temperature and, through a control circuit in a control instrument enclosure (16), is used to control power to the heater element (36). A guide wheel, foot rest (44) and air dam (74) are also provided. |
