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US 4,121,527 AGranted
Hook drive for sewing machines
AssigneeThe Singer Company
InventorRalph E. Johnson
Life of this patent
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AssigneeThe Singer Company
InventorRalph E. Johnson
Estimating the term…
This disclosure relates to hook drive mechanisms for sewing machines and in particular to a hook drive mechanism wherein the hook member is freely supported by a bearing means in a hook support plate carried by the bed portion of the frame and is driven by a likewise freely supported drive member. The support plate with the hook member is supported for relative adjustment with the needle for adjusting the hook point-to-needle relationship. The hook member is readily removable in that it is freely supported in the aforementioned bearing means and is otherwise only restrained by a movable restraining means carried by a hook member cover plate which when removed from restraining relationship permits the bobbin and the hook member to be easily lifted out from the machine. Further, means are carried on the hook support plate for adjusting and maintaining tension on a timing belt drive means for the hook mechanism.
A hook drive mechanism for a sewing machine including a frame having a bed portion, a reciprocating needle mechanism, a hook mechanism disposed in said bed portion for cooperation with said needle mechanism for forming stitches, said hook drive mechanism comprising a hook support plate disposed in said bed portion and including a hook drive mechanism bearing means, a hook member having a hook body portion and shaft portion depending therefrom, said shaft portion being freely supported by said bearing means, a hook drive member freely supported by said bearing means, means for initiating rotation of said drive member, interdigitation means on said hook member and said hook drive member freely shiftable into and out of drivingly interconnecting said drive member with said hook member, said hook member and said drive member being freely removable from said bearing means and from each other.
Dependencies are inferred from the claim text.