Needle Severing Devices TRIZ Cases

An arc-shaped movable knife rotates around the rotary shuttle to cut thread while shrinking needle plate seat space and simplifying the drive.

A foreign matter detector signals the control unit to stop the movable blade before mistaken cutting occurs.

A coaxial movable knife frame follows the rotary shuttle’s arc, reducing needle plate volume and simplifying thread-cutting transmission.

A compact automatic thread cutting device for sewing machines uses a motor-driven worm gear rod to actuate a passive piece and thread hooking member.

A retaining element holds the lower thread along a circular-arc path to simplify sewing operations.

Segmented gripping grooves on a pivoted blade cut thick threads sequentially, reducing maximum cutting force and preventing interference.

Dynamic thread margin adjustment resolves fixed-length limitations in sewing machines, allowing variable thread settings for diverse fabric types.

A sewing machine thread cutter uses a moving knife and air blow mechanism to guide the upper thread end portion for precise cutting.

A thread catcher clamp and tensioning device guide the upper thread initial section beneath fabric to create a controlled seam start.

Dual seizing assemblies move threads toward a blade near the needle hole, eliminating excess thread length and preventing entanglement.

A multi-needle sewing machine uses a guide member and elastic clamping members to position the upper thread end portion between the presser foot and needle bar.

A dyeing unit colors thread while a remover extracts used portions near the needle to maintain precise control.

A sewing machine thread cutter uses two reciprocating seizing assemblies to position needle and bobbin threads against a fixed blade.

Integrating an anti-rotation stop directly onto a sewing machine thread-pulling knife consolidates mechanical functions into a single component.

A sewing machine uses a switching mechanism to position a contact member relative to the needle bar.

Replacing complex cam mechanisms with direct stepping motor drive eliminates transmission errors in sewing machine thread cutting operations.

A cam drive activated by a single stroke magnet synchronizes thread cutting and lead-in stitching motions with the primary shaft rotation.

A sewing mechanism positions needle thread loops away from the drop point to maintain interlocking density during stitching operations.

A cordless stitch remover uses a segmented blade with upper and lower teeth to cut fabric layers precisely.

Tensioning the upper thread extracts the lower thread end to the exterior surface, eliminating manual removal and preventing material damage.

A CB hook mechanism with a lifting magnet actuator cuts upper and lower threads simultaneously to precise lengths.

Clamping device on pressure bar holds thread end while cutting element trims upper thread, eliminating manual post-processing of protruding starts.

A sewing machine thread cutting device uses a conversion link to transform linear motion into circular knife movement.

A sewing machine thread holder applies predetermined resistance via a passage resistance applier to prevent needle thread disengagement during threading.

An actuated thread clamp pre-tensions threads at the puncture point, resolving inconsistent seam start reliability across varying material thicknesses.

Thread take-up mechanism secures needle thread after cutting, eliminating the picker to enlarge the sewable area and reduce production costs.

Segmented clamping elements and movable thread knife enable precise cutting of sewing threads within the eyelet stitch area.

Continuous counter knife positioning minimizes wear and extends service life while maintaining reliable thread cutting performance.

Bulged bed portion separates lower thread from cloth, guiding the upper knife to cut reliably despite strong tension.

Segmented thread catchers and a sliding fixed blade resolve reliability and maintenance contradictions in sewing machines.

Segmented cutting elements pivot selectively to minimize vibration and wear from simultaneous mass acceleration in large embroidery machines.

A slidable thread holding secures yarn on a sewing machine hooking base through simple manual movement.

Movable cutter swings near needle hole to trim sewing thread, eliminating long loose ends that require manual trimming.

A sewing machine holding member moves between a lowered threading position and a retracted operational position to clear the needle area.

A sewing machine for composite materials uses pneumatic fiber supply to enable continuous stitching.

A sewing machine design uses a single drive source to power both the thread cutting mechanism and the picker movement.

A sewing machine thread-pulling knife features a lengthened, rounded end section to guide needle thread smoothly.