Thread take-up lever switching mechanism and sewing machine
AssigneeJanome Corporation
InventorsToyohiro Azuma, Ushio Yokoyama
Life of this patent
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Abstract
A thread take-up lever switching mechanism can switch the operation of a thread take-up lever which is interlocked with an upper shaft. The thread take-up lever switching mechanism includes: a cylindrical cam provided on the upper shaft, the cylindrical cam having a plurality of cam surfaces; a contact portion provided on the thread take-up lever, the contact portion contacting a first surface of the plurality of cam surfaces; and a switch for switching the contact portion from a first position of contacting the first surface of the plurality of cam surfaces to a second position of contacting a second surface of the plurality of cam surfaces.
Claims5
A thread take-up lever switching mechanism provided on a double chain stitch sewing machine for changing an operation of a thread take-up lever which is interlocked with an upper shaft, the thread take-up lever switching mechanism comprising:
- a cylindrical cam provided on the upper shaft, the cylindrical cam having a plurality of cam surfaces;
- a contact portion provided on the thread take-up lever, the contact portion contacting a first surface of the plurality of cam surfaces;
- and
- a switch for switching the contact portion from a first position of contacting the first surface of the plurality of cam surfaces to a second position of contacting a second surface of the plurality of cam surfaces, wherein
- when an axial direction of the upper shaft is a left-right direction, a longitudinal direction the thread take-up lever is arranged in the left-right direction and the contact portion is protruded in a front-rear direction from the thread take-up lever.
Dependencies are inferred from the claim text.