| 摘要 |
A hot-melt glue gun having a rod feeding mechanism (14) comprising trigger means (50) arranged to drive clamping means to grip a solid rod of thermoplastic material and to move the rod towards a melt chamber (17) of the gun. The clamping means includes a carriage (42) movable towards and away from the melt chamber and having a support portion (110) to accept a rod to be fed. The clamping means also includes, pivotally mounted on the carriage, a clamp member having a clamping arm portion (71) for gripping the rod against the support portion (110), and a crank arm portion (70). The crank arm portion has an operating portion (49) with a convex surface (64) arranged to co-operate with pressure means (207) of pivotally-mounted connecting means (52). The connecting means is positioned to be operated by the trigger. By virtue of the disposition of the pivots and the clamping arm and of the shaping of the operating portion of the crank arm, an increased component of the feeding force is applied to the rod in a direction parallel to the axes of the melt chamber and of the rod; thus improving the application of triggering effort in feeding the rod. The clamping arm portion is disposed and shaped to reduce distortion of the rod when gripping the rod. |
