| 摘要 |
A looper and knife driving mechanism of sawing machine, wherein an upper looper (30) and a lower looper (40) are provided under a needle plate (8), knife tips (31, 41) are disposed in the same direction so as to pass through the front side side-face of a needle (8) as viewed in the sawing direction, and the upper looper (30) and lower looper (40) are driven so that the route s thereof move on those surfaces substantially in parallel with each other in order to provide both the lock stitch and over-edge chain stitch functions and, in addition, form the sawing at once by a single sawing machine, the rotating motion of the upper shaft (S1) of the sawing machine is converted into a vertical motion through a motion converting mechanism (71) interlocke d with the rotating motion so as to cut off a cloth edge (5c) by the vertical motion using an upper knife (72) and a lower knife (73) moving in associatio n with the upper knife (72), the upper knife (72) being guided slidably by a female driving part (74) (710) pivotally supported by a machine frame FR and the motion converting mechanism (71) being connected to the upper knife (72) through a clutch (75)(750), whereby the clutch (75)(750) transmits a power t o the upper knife (72) when the knife of the knife driving part (74)(710) is operated and drives the female driving part (74)(710) to an escape position when the knife is not operated so as to cut off a power to the upper knife (72).
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