CN-121992588-A - Thread cutting mechanism and thread cutting method of sewing equipment and sewing equipment

CN121992588ACN 121992588 ACN121992588 ACN 121992588ACN-121992588-A

Abstract

The application relates to a thread cutting mechanism, a thread cutting method and sewing equipment of sewing equipment, wherein the thread cutting mechanism of the sewing equipment comprises a cutter rest assembly, a driving mechanism and a thread cutting mechanism, wherein the cutter rest assembly comprises a movable cutter rest and a fixed cutter rest which are in interactive fit, the movable cutter rest and the fixed cutter rest are used for correspondingly installing a movable cutter and a fixed cutter, and the driving mechanism is respectively in transmission connection with the movable cutter rest and the fixed cutter rest so as to drive the movable cutter and the fixed cutter to be matched with each other to cut threads. According to the technical scheme disclosed by the application, the motion control of the knife rest assembly is changed, the motion of the movable knife rest and the fixed knife rest in the line cutting circulation is actively controlled, the adaptability to different working conditions can be effectively improved after the motion of the movable knife rest and the fixed knife rest are combined, the stability of the line hooking action is improved, the whole action is smooth and stable, and the production efficiency is improved.

Inventors

LI WEICHAO
GONG FUHUA
CHEN BIN
YANG CONGCONG

Assignees

浙江杰克智能缝制科技有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. Thread cutting mechanism of sewing equipment, its characterized in that includes: the knife rest assembly comprises a movable knife rest and a fixed knife rest which are in interactive fit, and the movable knife rest and the fixed knife rest are used for correspondingly installing a movable knife and a fixed knife; the driving mechanism is respectively connected with the movable knife rest and the fixed knife rest in a transmission way so as to drive the movable knife and the fixed knife to be matched with each other to cut the wire.
2. The thread cutting mechanism of a sewing apparatus as recited in claim 1, wherein the drive mechanism comprises: a power source; a conjugate cam coupled to the power source and including at least a first cam and a second cam; The transmission assembly is two sets, wherein the first transmission assembly is connected between the first cam and the movable cutter frame, and the second transmission assembly is connected between the second cam and the fixed cutter frame.
3. The thread cutting mechanism of a sewing apparatus as recited in claim 2, wherein the movement trend of the moving knife comprises, in different directions: A forward stage moving from a first position at one end to a second position at the other end; a return stage, moving from the second position to the first position and implementing thread cutting by matching with the fixed knife in the moving process; The cams are provided with eccentric parts so as to drive corresponding transmission components, and the eccentric parts of the second cams are configured to drive the second transmission components to interfere the moving knife rest at least twice in the return stage of the moving knife.
4. The thread cutting mechanism of the sewing apparatus according to claim 3, wherein the return stroke stage of the movable knife comprises at least a thread hooking stage and a thread cutting stage which are sequentially performed, and the swinging twice is respectively: The first swing corresponds to the thread hooking stage; And swinging for the second time, which corresponds to the thread cutting stage or after the thread cutting stage.
5. The thread cutting mechanism of a sewing apparatus of claim 4, wherein the first transmission assembly comprises: The first swing arm is pivoted to the frame of the sewing equipment, and one end of the first swing arm is linked with the movable knife rest and toggles the movable knife rest to translate; the first moving shaft is driven by the first cam and is slidably arranged on a frame of the sewing equipment along the axis of the first moving shaft; the first connecting rod is hinged between the first moving shaft and the first swing arm.
6. The thread cutting mechanism of a sewing apparatus of claim 4, wherein the second transmission assembly comprises: the second moving shaft is driven by the second cam and is slidably arranged on a frame of the sewing equipment along the axis of the second moving shaft; the second swing arm is pivoted to the frame of the sewing equipment, one end of the second swing arm is hinged and linked with the fixed knife rest, the end of the second swing arm is also in interference and linkage with the movable knife rest, and the other end of the second swing arm is hinged with the second moving shaft through the first motion release hole.
7. The thread cutting mechanism of a sewing apparatus as recited in claim 6, wherein the movable blade carrier is provided with a second motion release hole through which a hinge portion of the second swing arm with the stationary blade carrier passes for interference-coupling the movable blade carrier.
8. The thread cutting method is characterized by comprising the following steps: Providing a knife rest assembly comprising a sliding fit and a moving knife and a stationary knife for performing wire cutting; When cutting the wire, driving the movable knife to enter a forward stage and move from a first position at one end to a second position at the other end; And driving the movable knife to enter a return stage, moving from the second position to the first position, wherein the knife rest assembly at least undergoes first swinging and performs thread hooking during the movement process, and the knife rest assembly swings for the second time to avoid the curved needle.
9. The wire cutting method as set forth in claim 8, wherein the carriage assemblies each have, in terms of overall swing amplitude: the initial state corresponds to the state when the movable knife is at the second position; The first gesture corresponds to the first swing of the movable knife; the second gesture corresponds to the second swing of the movable knife; in the forward stage, the movable knife is reset to an initial state from the first posture by the knife rest assembly.
10. Sewing apparatus, characterized by comprising a thread cutting mechanism of the sewing apparatus of any one of claims 1 to 9.

Description

Thread cutting mechanism and thread cutting method of sewing equipment and sewing equipment Technical Field The application relates to the technical field of sewing equipment, in particular to a thread cutting mechanism and a thread cutting method of the sewing equipment and the sewing equipment. Background A sewing machine is a machine that interweaves or sews one or more layers of stitching material together using one or more stitches to form one or more stitches on the stitching material. Especially, large-scale sewing machines for factories are more widely used in manufacturing enterprises for mass-producing clothes. At present, most industrial sewing machines are added with an automatic thread cutting device so as to save labor, electricity and manpower. An automatic thread cutting device of a sewing machine generally comprises a movable knife and a fixed knife which are matched with each other. The movable knife is provided with a wire hooking groove. In the thread cutting process, the movable knife moves to the vicinity of the thread, and the thread is hooked back to the fixed knife through the thread hooking groove to cut the thread. In the prior art, in order to more conveniently control the movement of the movable knife, the movement process of the movable knife in the knife discharging and knife returning processes is the same. In order to realize stable thread cutting, the position of the cutter head needs to be adjusted according to different needle pitches, the operation is complicated, the adaptability is poor, the risk that the thread is not hooked or is separated in a complex working condition exists, the production efficiency and the production safety are negatively influenced, and an improvement space exists. Disclosure of Invention The thread cutting mechanism of the sewing equipment provided by the application changes the motion control of the knife rest assembly, effectively improves the adaptability to different working conditions, and simultaneously improves the stability of thread hooking action, and the overall action is smooth and stable. The thread cutting mechanism of the sewing equipment comprises: the knife rest assembly comprises a movable knife rest and a fixed knife rest which are in interactive fit, and the movable knife rest and the fixed knife rest are used for correspondingly installing a movable knife and a fixed knife; the driving mechanism is respectively connected with the movable knife rest and the fixed knife rest in a transmission way so as to drive the movable knife and the fixed knife to be matched with each other to cut the wire. The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions. In one embodiment, the driving mechanism includes: a power source; a conjugate cam coupled to the power source and including at least a first cam and a second cam; The transmission assembly is two sets, wherein the first transmission assembly is connected between the first cam and the movable cutter frame, and the second transmission assembly is connected between the second cam and the fixed cutter frame. In one embodiment, the movement trend of the moving blade includes: A forward stage moving from a first position at one end to a second position at the other end; a return stage, moving from the second position to the first position and implementing thread cutting by matching with the fixed knife in the moving process; The cams are provided with eccentric parts so as to drive corresponding transmission components, and the eccentric parts of the second cams are configured to drive the second transmission components to interfere the moving knife rest at least twice in the return stage of the moving knife. In one embodiment, the return stage of the moving blade at least includes a hooking stage and a trimming stage that are sequentially performed, and the swinging twice is respectively: The first swing corresponds to the thread hooking stage; And swinging for the second time, which corresponds to the thread cutting stage or after the thread cutting stage. In one embodiment, the first transmission assembly includes: The first swing arm is pivoted to the frame of the sewing equipment, and one end of the first swing arm is linked with the movable knife rest and toggles the movable knife rest to translate; the first moving shaft is driven by the first cam and is slidably arranged on a frame of the sewing equipment along the axis of the first moving shaft; the first connecting rod is hinged between the first moving shaft and the first swing arm. In one embodiment, the second transmission assembly includes: the second moving shaft is driven by the second cam and is slidably arranged on a frame of the sewing equi