摘要:
A method and apparatus are provided for forming a strap loop and securing it about an article (P). The strap free end is pressed against a guide surface (224) and moved in a path to form a primary strap loop (LP) while permitting the primary strap loop (Lp) to twist off of the guide surface (224). With the free end of the strap (S) held against further movement, the trailing portion of the strap (S) is fed to expand the loop to a predetermined larger size. The article (P) is inserted in the loop (L F ) and the trailing portion of the strap (8) is withdrawn to tighten the loop (L F ) about the package (P). The trailing portion of the strap (S) is severed from the tightened strap loop (LF) and the overlapping portions of the strap (S) are then sealed by a friction-fusion weld.
摘要:
A method and apparatus for a two speed strap take up usable in a strapping machine. The two speed strap take up apparatus generally comprises a high speed roller assembly (20) driven by a high speed drive shaft (28), a low speed roller assembly (40) driven by a low speed drive shaft (48), a shaft rotation reduction assembly (56) interconnecting the high speed drive shaft (28) and the low speed drive shaft (48), and a roller clutch assembly (220) inter-connecting the shaft rotation reduction assembly (56) and the low speed drive shaft (48). An input clutch assembly (250) may inter-connect the high speed drive shaft (28) and an input drive means. In operation, a strap (12) is disposed between and frictionally engaged by a high speed roller (22) of the high speed roller assembly (20) and a low speed roller (42) of the low speed roller assembly (40). The low speed roller (42) is then driven in rotation by the high speed roller (22). When a first tension is applied to the strap (12), the high speed roller (22) slips relative to the high speed drive shaft (28) until the roller clutch (220) inter-connecting the shaft rotation reduction assembly (56) and the low speed drive shaft (48) engages and rotates the low speed drive shaft (48) at a reduced rotation rate relative to the rotation rate of the high speed drive shaft (28). The strap (12) is now driven by both rollers (22, 42) at the reduced rotation rate as the high speed roller (22) slips relative to the high speed drive shaft (28). When a second tension, greater than the first tension, is applied to the strap (12), the low speed roller (42) slips relative to the low speed drive shaft (48) at which time the strapping machine may perform additional functions on the strap (12) such as securing it around a package.
摘要:
A method and apparatus are provided for forming a strap loop and securing it about an article (P). The strap free end is pressed against a guide surface (224) and moved in a path to form a primary strap loop (LP) while permitting the primary strap loop (Lp) to twist off of the guide surface (224). With the free end of the strap (S) held against further movement, the trailing portion of the strap (S) is fed to expand the loop to a predetermined larger size. The article (P) is inserted in the loop (L F ) and the trailing portion of the strap (8) is withdrawn to tighten the loop (L F ) about the package (P). The trailing portion of the strap (S) is severed from the tightened strap loop (LF) and the overlapping portions of the strap (S) are then sealed by a friction-fusion weld.