A Study of Parameters of the Sewing Thread Cutting Process

Sewing thread cutting processes are widely used in semi-automatic machines in the garment industry. The lack of scientifically justified methods for designing mechanisms for thread trimming in semi-automatic sewing machines makes studying these processes a topical issue. There are works that examine cutting free-hanging yarn using scissors. However, these results cannot be used to develop mechanisms for thread trimming in semi-automatic sewing machines for the following reasons: the properties of free-hanging yarn and sewing thread vary significantly, and the cutting conditions for the thread that grips the blade of a movable knife are different as well. Another reason is that as a rule, sewing thread cutting occurs in a limited space, which imposes a significant restriction on the design parameters of knives and affects the cutting process. There are no such restrictions when cutting yarn. Cutting threads by the method of scissors does not provide complete cutting of all the components of the thread if the knife blades are not in tight contact with each other. To ensure complete trimming, a design scheme of cutting was developed, and calculation formulas were obtained for determining the force exerted by the thread on the movable knife, taking into account the mechanical characteristics of the cut thread.

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