Speed setting device for a sewing machine

Claim 1

A device for use in a sewing machine for generating a speed setting signal in resonse to an angular displacement caused by an operator's action, comprising: a first member pivotally mounted at one end thereof on a first rotary axis of a stationary member and adapted to turn about said rotary axis in response to said angular displacement; a second member pivotally mounted at one end thereof on a secondary rotary axis of said stationary member spaced from said first rotary axis; a shaft extending transversely from one of said first and second members to the other member through an opening provided on said other member for rotatably coupling said first and second members at a point adjacent said first rotary axis but remote from said first rotary axis so that said second member rotates through an angle greater than the angle through which the first member rotates; means for urging said first and second members against each other for minimizing the amount of loose play which might otherwise exist between said shaft and said opening; magnetic flux generating means; magnetic flux sensing means for generating said speed setting signal, one of the flux generating and sensing means being mounted on said second member in coaxial relationship with said secondary rotary axis, the other of said flux generating and sensing means being mounted on said stationary member coaxially with and spaced from said means mounted on said second member; and means for maintaining the spacing between the flux generating means and the flux sensing means constant in the axial direction of said second rotary means comprising: (i) spacer means located between said flux generating means and said flux sensing means so that the flux generating means abut against oppositely disposed segments of the spacer means, and (ii) means for urging said flux generating means and said flux sensing means in a direction toward each other.

Claim 2

A device for use in a sewing machine for generating a speed setting signal in resonse to an angular displacement caused by an operator's action, comprising: a first member pivotally mounted at one end thereof on a first rotary axis of a stationary member and adapted to turn about said rotary axis in response to said angular displacement; a second member pivotally mounted at one end thereof on a secondary rotary axis of said stationary member spaced from said first rotary axis; a shaft extending transversely from one of said first and second members to the other member through an opening provided on said other member for rotatably coupling said first and second members at a point adjacent said first rotary axis but remote from said first rotary axis so that said second member rotates through an angle greater than the angle through which the first member rotates; means for urging said first and second members against each other for minimizing the amount of loose play which might otherwise exist between said shaft and said opening; magnetic flux generating means; magnetic flux sensing means for generating said speed setting signal, one of the flux generating and sensing means being mounted on said second member in coaxial relationship with said secondary rotary axis, the other of said flux generating and sensing means being mounted on said stationary member coaxially with and spaced from said means mounted on said second member; and means for maintaining the spacing between the flux generating means and the flux sensing means constant in the axial direction of said second rotary means comprising: (i) spacer means located between said flux generating means and said flux sensing means so that the flux generating means abut against oppositely disposed segments of the spacer means, and (ii) means for urging said flux generating means and said flux sensing means in a direction toward each other.

Claim 8

A device for use in a sewing maching for generating a speed setting signal in response to an angular displacement caused by an operator's action, comprising: a first member pivotally mounted at one end thereof on a first rotary axis of a stationary member and adapted to turn about said rotary axis in response to said angular displacement; a second member pivotally mounted at one end thereof on a second rotary axis of said stationary member spaced from said first rotary axis; a shaft extending transversely from one of said first and second members to the other member through an opening provided on said other member for rotatably coupling said first and second members at a point adjacent said second rotary axis but remote from said first rotary axis so that said second member rotates through an angle greater than the angle which the first member rotates; means for urging said first and second members against each other for minimizing the amount of loose play which might otherwise exist between said shaft and said opening; means for generating a flux field; means for sensing the flux field derived by the flux field generating means; the flux field generated and sensed by said generating and sensing means being of a type that changes in characteristic as a function of distance and offset between the flux field sensing and generating means, the flux field sensing means responding to the flux coupled to it from the flux field generating means for generating said speed setting signal, one of the flux generating and sensing means being mounted on said second member in coaxial relationship with said secondary rotary axis, the other of said flux generating and sensing means being mounted on said stationary member coaxially with and spaced from said means mounted on said second member; and means for maintaining the spacing between the flux generating means and the flux sensing means constant in the axial direction of said second rotary means comprising: (i) spacer means located between said flux generating means and said flux sensing means so that the flux generating means abuts against oppositely disposed segments of the spacer means, and (ii) means for urging said flux generating means and said flux sensing means in a direction toward each other.

Claim 9

A device for use in a sewing maching for generating a speed setting signal in response to an angular displacement caused by an operator's action, comprising: a first member pivotally mounted at one end thereof on a first rotary axis of a stationary member and adapted to turn about said rotary axis in response to said angular displacement; a second member pivotally mounted at one end thereof on a second rotary axis of said stationary member spaced from said first rotary axis; a shaft extending transversely from one of said first and second members to the other member through an opening provided on said other member for rotatably coupling said first and second members at a point adjacent said second rotary axis but remote from said first rotary axis so that said second member rotates through an angle greater than the angle which the first member rotates; means for urging said first and second members against each other for minimizing the amount of loose play which might otherwise exist between said shaft and said opening; means for generating a flux field; means for sensing the flux field derived by the flux field generating means; the flux field generated and sensed by said generating and sensing means being of a type that changes in characteristic as a function of distance and offset between the flux field sensing and generating means, the flux field sensing means responding to the flux coupled to it from the flux field generating means for generating said speed setting signal, one of the flux generating and sensing means being mounted on said second member in coaxial relationship with said secondary rotary axis, the other of said flux generating and sensing means being mounted on said stationary member coaxially with and spaced from said means mounted on said second member; and means for maintaining the spacing between the flux generating means and the flux sensing means constant in the axial direction of said second rotary means comprising: (i) spacer means located between said flux generating means and said flux sensing means so that the flux generating means abuts against oppositely disposed segments of the spacer means, and (ii) means for urging said flux generating means and said flux sensing means in a direction toward each other.