Skip stitch prevention apparatus for sewing machine
AssigneeJuki Corporation
InventorHitoshi Ito
Life of this patent
Estimating the term…
Abstract
A mechanism for a sewing machine for use in forming stitches by use of a looper thread which is controlled by a looper. This mechanism is adapted so that the looper thread which is run from a thread-thru hole to a stitch forming station is prevented from skipping over a needle penetrating point when a looper is moved upon descending of a needle, whereby stitches are formed without any skip stitch.
Claims10
Apparatus for preventing a skipping stitch in a sewing machine having a throat plate, which accomplishes a seam relative to a reciprocating sewing looper, said apparatus comprising:
- a first looper thread blocking device having a surface which is fixed to an under-surface of a throat plate for preventing a looper thread, which exists between a thread-thru hole in a tip of said sewing looper and a stitch forming station, from passing over a penetrating point of a sewing needle as said sewing needle moves downward.
Apparatus for preventing a skipping stitch in a sewing machine having a throat plate, which accomplishes a seam relative to a reciprocating sewing looper, said apparatus comprising:
- a first looper thread blocking device for preventing a looper thread, which exists between a thread-thru hole in a tip of said sewing looper and a stitch forming station, from passing over a penetrating point of a sewing needle as said sewing needle moves downward;
- and
- a second looper thread blocking device for preventing said looper thread from moving into a side of said sewing looper through said thread thru-hole as said sewing needle moves downward.
Apparatus for preventing a skipping stitch in a sewing machine having a throat plate, which accomplishes a seam relative to a reciprocating sewing looper, said apparatus comprising:
- a first looper thread blocking device having a surface which is fixed to an undersurface of a throat plate to prevent a looper thread from passing over a penetrating point of a sewing needle.
Apparatus for preventing a skipping stitch in a sewing machine having a throat plate, which accomplishes a seam relative to a reciprocating sewing looper, said apparatus comprising:
- a first looper thread blocking device having a surface positioned opposite to a backward path of said looper and over a movement path of said looper to prevent a looper thread from passing over a penetrating point of a sewing needle;
- and
- a second looper thread blocking device for preventing said looper thread from moving into a side of said sewing looper through thread thru-hole as sewing needle moves downward.
An apparatus for preventing a skipping stitch in a sewing machine having a throat plate, which accomplishes a seam relative to a reciprocating sewing looper moving along a first plane, said apparatus comprising:
- a first looper thread blocking device having a surface lying in a second plane which intersects said first plane;
- and
- a second looper thread blocking device for preventing a looper thread from moving into a side of said sewing looper through thread thru-hole as sewing needle moves downward.
Dependencies are inferred from the claim text.