| 摘要 |
The invention relates to a servo knife assembly (1) for cutting web material. The servo knife assembly (1) comprises a frame assembly (2) having a fixed blade (3) and a moveable blade (4), a base assembly (5) for linear adjustment of changing pouch lengths, a servo motor and gear box assembly (6) providing actuation, and a crank and linear bearing assembly (7,8), the crank and linear bearing assembly (7,8) drives the moveable blade (4) for cutting operation, wherein the crank and linear bearing assembly (7,8) comprises at least a crank arm (16) and linear bearing means (13f, 13h) guiding the moveable blade (4), wherein the crank motion is transferred to the moveable blade (4) thru the bearing mounted crank arm (16), such that the moveable blade (4) moves in a linear motion relative to the fixed blade (3). The new servo pouch knife assembly (1) uses a unique crank method to translate the rotary motion of a servo motor and gearbox, into a high speed and highly accurate linear motion to cycle the knife blades in and out to cut the web material off during the machine swell cycle.
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