Double-needle chuck assembly with movable knife for sewing machine
OwnerKevin B. Bonnerinventor
Life of this patent
Estimating the term…
Abstract
A double-needle chuck assembly for a sewing machine is provided with a knife that is moveable from a position on one side of the needles to a position on the other side. This enables a closed slit, as might be required for a pocket of a garment, to be produced with stitching on both sides and at the ends thereof without reversing the direction of movement of the fabric or using a separate step in a production line. The knife is mounted on a rod which engages a slot extending between the needles, with the rod being securable in either of the two positions by a detent mechanism. Movement of the rod to change positions of the knife may be performed manually or by a pneumatic actuator.
Claims8
A double-needle chuck assembly for a sewing machine comprising:
- a supporting block;
- means for attaching said block to a vertically reciprocating member of a sewing machine;
- a pair of needles for producing two rows of stitches in a workpiece to be sewn vertically mounted in said block in spaced apart, parallel relation and defining a line therebetween;
- a knife supported by said block and positioned to make a closed end slit in said workpiece perpendicular to said line between said needles and intermediate to said two rows of stitches produced by said needles;
- and
- means associated with said block for moving said knife from a first operating position on one side of said line between said needles to a second operating position on the opposite side thereof comprising:
- a track carried by said block and having an axis perpendicular to said line, a knife-supporting element slidably mounted for linear movement along said axis in said track, said knife being mounted in a fixed position on said element;
- whereby said knife may be placed in trailing relation to said needles at each end of said closed end slit;
- and
- means carried by said block for removably securing said knife-supporting element in a first location along said axis whereby said knife is held in said first operating position and in a second location along said axis whereby said knife is held in said second operating position.
Dependencies are inferred from the claim text.