Side-cutter normal sewing machine with cutter connecting and disconnecting mechanism

Abstract

The invention discloses a side-cutter normal sewing machine with a cutter connecting and disconnecting mechanism. The side-cutter normal sewing machine comprises a machine head; a face plate is connected with the machine head; a cutter lowering lever and a cutter lifting lever are arranged on the face plate; a cutter lifting crank component is driven by the cutter lifting lever to transversely pull a driving lever, the driving lever drives a connecting and disconnecting pin to move transversely to be disconnected from a hole of a slider, the cutter connecting and disconnecting mechanism is enabled to enter the disconnected status, and a cutter is incapable of working at the moment; a cutter lowering plate component is driven by the cutter lowering lever to press downwards and drives a cutter bar seat to move downwards; when the cutter bar seat moves to be in contact with a crank, the crank pushes the driving lever to rotate through a driving lever spring, the driving lever drives the connecting and disconnecting pin to move reversely, the connecting and disconnecting pin enters the hole of the slider, the cutter connecting and disconnecting mechanism enter the connected status, and the cutter is capable of working at the moment. Cylinder and slot fit is replaced by fitting between a cylinder section of the connecting and disconnecting pin and the slider hole of the slider and fitting of the slider plane and a slider groove, line contact is avoided, and wear is delayed.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a side cutter lockstitch sewing machine with a cutter clutch mechanism. Background technique [0002] The feature of the side cutter lockstitch sewing machine is that the selvedge is trimmed neatly by the cutter while sewing, so it has been widely used in the garment industry. In the process of producing clothes, sometimes it is necessary to trim the edge, and sometimes it is not necessary to trim the edge, so the side cutter lockstitch sewing machine must have a clutch mechanism. [0003] The way of dropping the knife of the existing side cutter lockstitch sewing machine is to manually press the wrench on the upper end of the knife bar. When the cylinder enters the chute of the knife bar seat, the force can be transmitted to the knife bar. The tool bar of this structure must be very long, and the upper end is always exposed above the machine head, and the hand must be raised very high during...

AI Technical Summary

Problems solved by technology

[0004] The clutch mechanism of the existing side cutter lockstitch sewing machine is that the cylinder directly cooperates with the chute. Since the cylinder and the chute are in line contact, the wear is relatively fast; after the knife is lifted, the end of the cylinder and the knife holder are under the action of the spring. Since contact creates friction, it also wears

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