Trimming mechanism for computer straight buttonhole machine

The utility model discloses a trimming mechanism for a computer straight buttonhole machine. The trimming mechanism comprises an upper thread blade component, wherein the upper thread blade component is fixedly arranged at the lower end of a holding frame component; the upper thread blade component is fixedly connected with a lower thread blade component; an upper end of the holding frame component fixedly sleeves one end of a trimming shaft; the other end of the trimming shaft is fixedly connected with an upper part of a hinge plate; a lower part of the hinge plate is hinged to the right end of a universal connecting rod; a driving plate is hinged to the left end of the universal connecting rod; a sliding slot is arranged on the middle part of the driving plate; an idler wheel is moveably arranged in the sliding slot; the idler wheel is connected with the middle part of a pressing stick lifting rod; the right end of the pressing stick lifting rod is hinged to the frame through a clutch hinge pin; the pressing stick lifting rod is connected with a driven toothed sliding block through a small sliding block; the driven toothed sliding block is meshed with a driving gear; the driving gear can realize driving under the effect of a stepping motor. The trimming mechanism for the computer straight buttonhole machine has the advantages of simple structure, few parts and simple and accurate debugging.