| 摘要 |
An apparatus is disclosed for automatically substituting a fully threaded bobbin assembly for a used bobbin assembly in a thread shuttle of a sewing machine having the bobbin assembly latched to the thread shuttle. A pivoted hook unlatches the spent bobbin assembly from the thread shuttle and then a plunger extracts the spent bobbin assembly and places it in a magazine. The magazine carries a new and full thread bobbin assembly and the plunger transfers the full thread bobbin assembly into latched engagement with the thread shuttle. An electric control system including an automatic counter counts the number of sewing operations and after a predetermined number of sewing operations causes the automatic exchange of bobbin assemblies.
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