Patent ID: 6415725
Filing Date: 2002-07-09
Classification: D05B

Abstract:
A sewing machine with a work pressing bar positioning device having a work pressing bar having a work pressing foot removably attached to a lower end thereof and being vertically movable between a first set position in which the work pressing foot is in contact with a needle plate in a lower position and a second set position in which the work pressing foot is vertically spaced up from the needle plate, said sewing machine comprising:(a) means for giving a pressure to said work pressing bar, thereby to press said work pressing foot against said needle plate; (b) means for transmitting said pressure given by said pressure giving means to said work pressing bar when said work pressing bar is in the first set position; (c) means operated to cancel the transmission of said pressure to said work pressing bar; (d) means operated in response to operation of said transmission canceling means to move said work pressing bar from said first set position to said second set position; (e) means for operating said transmission canceling means to change over a set position of said work pressing bar between said first set position and said second set position; wherein said means for transmitting said pressure to said work pressing bar includes: (1) a means mounted on said work pressing bar and being movable axially of said work pressing bar, said mounting means being normally subjected to said pressure giving means, (2) a means fixedly connected to said work pressing bar at a lower position with respect to said axially movable means, (3) a first link having one end operatively connected to said axially movable means, (4) a second link having one end operatively connected to the opposite end of said first link and has the opposite end operatively connected to said means which is fixedly connected to said work pressing bar, and (5) a means provided between said axially movable means and said fixedly connected means and normally exerting a force to move said fixedly connected means towards said axially movable means.