Automatic bobbin changer and apparatus for a sewing machine

An apparatus for automatically changing bobbin assemblies comprising a bobbin in a bobbin casing in a thread shuttle having a supporting shaft in latched engagement with a latch slide operated by a latch lever on the bobbin casing, said apparatus comprising an unlatching lever means having a hooked end for engaging the latch lever and pivoting the same to an open inclined position to cause the latch slide to shift to an unlatched position from the shuttle shaft, a plunger means having a surface for engaging the bobbin casing and for co-operative relationship with the unlatching lever to grip the used bobbin assembly and to pull the same from the shaft on the thread shuttle, a carrier means for carrying said plunger and unlatching lever in a direction from the thread shuttle, a magazine means having a plurality of receptacle openings therein with an open receptacle aligned to receive the used bobbin assembly, means for indexing the magazine means to position an unused bobbin assembly at a transfer station, means for actuating said carrier means to move said plunger to transfer the unused bobbin assembly at the transfer station into the thread shuttle, said plunger being mounted for movement through said receptacle opening in said magazine means.

An apparatus for automatically changing bobbin assemblies comprising a bobbin in a bobbin casing in a thread shuttle having a supporting shaft in latched engagement with a latch slide operated by a latch lever on the bobbin casing, said apparatus comprising an unlatching lever means having a hooked end for engaging the latch lever and pivoting the same to an open inclined position to cause the latch slide to shift to an unlatched position from the shuttle shaft, a plunger means movable along a path coaxial with said shuttle shaft and having a surface for engaging the bobbin casing and for co-operative relationship with the unlatching means to grip the used bobbin assembly and to pull the same from the shaft on the thread shuttle, a carrier means for carrying said plunger and unlatching means in a direction from the thread shuttle, a magazine means having a plurality of receptacle openings therein with an open receptacle axially aligned with said shaft to receive the used bobbin assembly, means for indexing the magazine means to position an unused bobbin assembly at a transfer station, and means for actuating said carrier means to move said plunger to transfer the unused bobbin assembly at the transfer station into the thread shuttle.

An apparatus for automatically changing bobbin assemblies comprising a bobbin in a bobbin casing in a thread shuttle having a supporting shaft in latched engagement with a latch slide operated by a latch lever on the bobbin casing, said apparatus comprising an unlatching lever means having a hooked end for engaging the latch lever and pivoting the same to an open inclined position to cause the latch slide to shift to an unlatched position from the shuttle shaft, a plunger means having a surface for engaging the bobbin casing and for co-operative relationship with the unlatching lever to grip the used bobbin assembly and to pull the same from the shaft on the thread shuttle, a carrier means for carrying said plunger and unlatching lever in a direction from the thread shuttle, a magazine means having a plurality of receptacle openings therein with an open receptacle aligned to receive the used bobbin assembly, means for indexing the magazine means to position an unused bobbin assembly at a transfer station, means for actuating said carrier means to move said plunger to transfer the unused bobbin assembly at the transfer station into the thread shuttle, and an indexing means for indexing the magazine and comprising a pawl means for stepping the magazine.

An apparatus for automatically changing bobbin assemblies comprising a bobbin in a bobbin casing in a thread shuttle having a supporting shaft in latched engagement with a latch slide operated by a latch lever on the bobbin casing, said apparatus comprising an unlatching lever means having a hooked end for engaging the latch lever and pivoting the same to an open inclined position to cause the latch slide to shift to an unlatched position from the shuttle shaft, a plunger means movable along a path coaxial with said shuttle shaft and having an inclined surface for cooperative gripping relationship with the hooked end of said unlatching lever to grip the latch lever, a carrier means for carrying said plunger and unlatching lever means in a direction from the thread shuttle, means for shifting said hooked end of said lever to said gripping relationship with said inclined surface, a release means for swinging said hooked end from said inclined surface and the latching lever, an end wall on said plunger means for pushing a new unused bobbin assembly into said thread shuttle, and means for shifting said carrier means toward and from said thread shuttle.