Patent ID: 9382650
Filing Date: 2016-07-05
CPC Classification: D05B

Claim Text:
1. A cutting device for a sewing machine, the sewing machine including a driven shaft and using an upper-blade drive device to move an upper blade of an upper-blade positioning device mounted on a base of the cutting device, on the base being further disposed a lower blade to cooperate with the upper blade; the upper-blade drive device including a driven member linked to a first end of a connecting rod via the driven shaft, and the connecting rod including the first end and a second end; the upper-blade positioning device including the upper blade, an upper-blade holder, a spring, a restricting member and a restricting pin, the upper blade being fixed at a head portion of the upper-blade holder, and the spring and the restricting member being sleeved on a body portion of the upper-blade holder; the cutting device being characterized in that: the upper-blade positioning device further includes an upper-blade drive member, the upper-blade holder is inserted through the upper-blade drive member and the spring, the restricting pin is engaged between the upper-blade drive member and the restricting member; a guide member is fixed to the base, and the upper-blade drive member has one end inserted through the guide member of the base and driven to move by the second end of the connecting rod; the guide member includes a guide hole for insertion of a rod portion of the upper-blade drive member.