Central bobbin shuttle
OwnerDaniele Cerlianiinventor
Life of this patent
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Abstract
A shuttle unit of the type comprising a discoid shuttle body provided with two conical portions, one front and one rear, disposed specularly with respect to the median plane of said shuttle body passing through the race of the shuttle body, and a shuttle driver guided in rotation to make the shuttle body oscillate. The front and rear portions define a containing cavity for the bobbin case and the thread bobbin. The front conical portion forms a base angle with the median plane of the shuttle body comprised between 43° and 49°.
Claims23
A shuttle unit of the type comprising a discoid shuttle body provided with two conical portions comprising a front conical portion and a rear conical portion, the conical portions disposed specularly with respect to a median plane of said shuttle body passing through a race of the shuttle, and a shuttle driver guided in alternating rotation to make said shuttle body oscillate, said conical portions defining a cavity for containing a bobbin case which is rotatably mounted, together with a thread bobbin, on a pin of the rear conical portion of said shuttle body, characterized in that the front conical portion forms a base angle α with the median plane of the shuttle body comprised between 43° and 49°.
A shuttle unit comprising:
- a discoid shuttle body provided with two conical portions comprising a front conical portion and a rear conical portion, the conical portions disposed specularly with respect to a median plane of said shuttle body passing through a race of the shuttle, said front conical portion cut at a top with a cam profile formed by a succession of points disposed at variable height with respect to the plane of said race, said cam profile divided into three portions comprising a first portion formed by a succession of points disposed along increasing heights with increments every 15 degrees of between 0.5 and 1.25 mm, a second portion formed by a succession of points disposed according to constant or increasing heights with increments every 15 degrees of not more than 0.25 mm, and a third portion formed by a succession of points disposed along decreasing heights with decrements every 30 degrees comprised between 0.05 and 0.5 mm, said conical portions defining a cavity for containing a bobbin case which is rotatably mounted, together with a thread bobbin, on a pin of the rear conical portion of said shuttle body, wherein the front conical portion forms a base angle α of between 43 and 49 degrees with the median plane of the shuttle body;
- and
- a shuttle driver guided in alternating rotation to make said shuttle body oscillate.
A shuttle unit comprising:
- a discoid shuttle body provided with two conical portions comprising a front conical portion and a rear conical portion, the conical portions disposed specularly with respect to a median plane of said shuttle body passing through a race of the shuttle, said conical portions defining a cavity for containing a bobbin case which is rotatably mounted, together with a thread bobbin, on a pin of the rear conical portion of said shuttle body, wherein the front conical portion forms a base angle α of between 43 and 49 degrees with the median plane of the shuttle body, wherein said shuttle body comprises a bottom end protruding from said rear conical portion and disposed parallel to the median plane of said race to support said pin, said bottom end comprising two sloping profiles comprising a top profile and a bottom profile, said two sloping profiles converging in proximity to said pin, and said bottom profile being disposed along a straight line forming an angle Θ with a horizontal, wherein said bottom profile is joined with the bottom end of the rear conical portion which has a straight portion parallel to the rear plane of said race and spaced from said plane by a distance of 0.5 mm or less;
- and
- a shuttle driver guided in alternating rotation to make said shuttle body oscillate.
Dependencies are inferred from the claim text.