Sewing machine

A sewing machine includes a stud carried by a journal surrounding a tubular needle bar having a lateral opening. A link connected to the journal normally drives the needle bar when the stud is engaged within the needle bar opening. A disconnecting rod within the tubular needle bar is axially displaceable and includes a ramp engageable with a control member, also within the needle bar, to drive the stud from the needle bar opening and thereby disengage the journal from the needle bar.

We claim:

1. A sewing machine, in which back and forth longitudinal movement of a tubular needle bar, designed to carry a needle, is assured by a journal surrounding the needle bar and connected to a link driven by an eccentric plate mounted on the main drive shaft of the machine, characterized in that said tubular needle bar is provided with a lateral opening, a transversely displaceable stud carried by said journal and engageable within said opening to lock said needle bar to said journal to permit normal back and forth longitudinal movement of said needle bar as said drive shaft is operated, a shiftable control member having a stop and mounted within the interior of said needle bar, a disconnecting rod within the interior of said needle bar movable axially to shift said stop to displace said stud from said lateral opening to provide disengagement between said journal and needle bar.

2. A sewing machine according to claim 1 including an axle transversely mounted within said needle bar, said control member comprising an elongated member pivotally supported upon said axle and having a head adjacent one end and said stop adjacent an opposite end, said disconnecting rod provided with a ramp juxtaposed said control member head whereby, axial movement of said disconnecting rod ramp toward said control member head pivotally shifts said control member about said axle to produce said displacement of said stud from said needle bar opening.

3. A sewing machine according to claim 1 including, slidable means movable to a first position adapted to abut said disconnecting rod at the time of ascent of said needle bar to produce said displacement of said stud from said needle bar opening.

4. A sewing machine according to claim 2 including, slidable means movable to a first position adapted to abut said disconnecting rod at the time of ascent of said needle bar to produce said displacement of said stud from said needle bar opening.

5. A sewing machine according to claim 3 wherein, said disconnecting rod includes an extendable portion projectable from the top of said needle bar, a notch formed in said extendable portion of said disconnecting rod and said slideable means movable to a second position adapted to abut said notch whereby said stop does not displace said stud from said lateral opening.

6. A sewing machine according to claim 4 wherein, said disconnecting rod includes an extendable portion projectable from the top of said needle bar, a notch formed in said extendable portion of said disconnecting rod and said slideable means movable to a second position adapted to abut said notch whereby said stop does not displace said stud from said lateral opening.

7. A sewing machine according to claim 1 including, a guide rod integral with said journal and a guide fork integral with said needle bar and slidably engaging said guide rod in order to prevent any rotation of said needle bar around its longitudinal axis.