Apparatuses, methods, and computer program products for quilting webs. A quilting machine includes a cutting edge, a looper from which thread is provided to form stitches, and an adjuster assembly. The adjuster assembly extends an adjuster toward the thread between the looper and the retainer. When the adjuster is moved, a predetermined amount of thread is pulled away from the looper by the adjuster to provide a controlled length of thread between the looper and the cutting edge. The looper assembly may also include an air nozzle that urges the thread away from the adjuster after the thread has been cut. The thread passes through a thread tension monitor that monitors tension in the thread. The tension monitor includes a lift arm that selectively disables the tension monitor so that a loss of tension in the sewing head does not shut down the quilting machine.

Apparatuses, methods, and computer program products for quilting webs. A quilting machine includes a cutting edge, a looper from which thread is provided to form stitches, and an adjuster assembly that includes a plurality of selectable positions. The adjuster assembly extends an adjuster toward the thread between the looper and the retainer. When the adjuster is moved, a predetermined amount of thread is pulled away from the looper by the adjuster to provide a controlled length of thread between the looper and the cutting edge. The adjuster is configured to be moved to an intermediate selectable position prior to starting a quilting pattern, and from the intermediate position to another selectable position subsequent to starting the quilting pattern.

Apparatuses, methods, and computer program products for quilting webs. A quilting machine includes a cutting edge, a looper from which thread is provided to form stitches, and an adjuster assembly that includes a plurality of selectable positions. The adjuster assembly extends an adjuster toward the thread between the looper and the retainer. When the adjuster is moved, a predetermined amount of thread is pulled away from the looper by the adjuster to provide a controlled length of thread between the looper and the cutting edge. The adjuster is configured to be moved to an intermediate selectable position prior to starting a quilting pattern, and from the intermediate position to another selectable position subsequent to starting the quilting pattern.

A compressed air supplying device of a sewing machine includes an air pump unit including a piston; a piston driving spring applying biasing force to the piston in an exhaust air direction which is a direction in which the air pump unit exhausts air for driving the piston in the exhaust air direction by the biasing force; a lever making the air pump unit perform intake air movements; and an operating force transmitting mechanism transmitting operating force of the lever to the piston for actuating the piston only in an intake air direction which is a direction in which the air pump unit intakes air against the biasing force of the piston driving spring by the operating force.

A compressed air supplying device of a sewing machine includes an air pump unit including a piston; a piston driving spring applying biasing force to the piston in an exhaust air direction which is a direction in which the air pump unit exhausts air for driving the piston in the exhaust air direction by the biasing force; a lever making the air pump unit perform intake air movements; and an operating force transmitting mechanism transmitting operating force of the lever to the piston for actuating the piston only in an intake air direction which is a direction in which the air pump unit intakes air against the biasing force of the piston driving spring by the operating force.

A thread inserting device includes a guide pin having a thread capture portion at its tip for capturing a thread; a holder that fixedly holds the guide pin; a main body (first and second main bodies) slidably mounting the holder; and a thread cutting portion provided to the main body for cutting the thread to a length equal to or smaller than the protrusion of the thread capture portion from a thread captured position on a thread tip 6a side after the thread is captured by the thread capture portion. By shifting the holder, the thread capture portion is protruded to a predetermined length from the main body, and the thread cut to a predetermined length by the thread cutting portion is inserted into the thread inserting hole.

A thread inserting device includes a guide pin having a thread capture portion at its tip for capturing a thread; a holder that fixedly holds the guide pin; a main body (first and second main bodies) slidably mounting the holder; and a thread cutting portion provided to the main body for cutting the thread to a length equal to or smaller than the protrusion of the thread capture portion from a thread captured position on a thread tip 6a side after the thread is captured by the thread capture portion. By shifting the holder, the thread capture portion is protruded to a predetermined length from the main body, and the thread cut to a predetermined length by the thread cutting portion is inserted into the thread inserting hole.

A overlock sewing machine includes a switch limiting arm rockable integrally with a main shaft fixing operating arm and an arm including arms which are actuated by operating a threading switching knob to engage with the switch limiting arm to rock a rocking lever portion and being engageable with a slide plate to move the position of the slide plate to a sewing executable position upon operating the threading switching knob to the sewing executing position side.

A overlock sewing machine includes a switch limiting arm rockable integrally with a main shaft fixing operating arm and an arm including arms which are actuated by operating a threading switching knob to engage with the switch limiting arm to rock a rocking lever portion and being engageable with a slide plate to move the position of the slide plate to a sewing executable position upon operating the threading switching knob to the sewing executing position side.

A device and the method for influencing the position of the knot (31) between the upper thread (23) and the lower thread (17) when sewing with a sewing machine (1) using a computer (37), which calculates for every sewing stitch to be formed a control value for an actuator (39), by which a braking force of the thread tension regulator (23) is controlled.