Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
416 words
An attachment assembly operable in a sewing machine for automatically controlling the position of the machine sewing needle comprising, in combination: a. drive means for said sewing needle including a needle drive shaft, b. a main motor for selectively driving said needle drive means, c. an auxiliary motor for said needle drive means to alternatively position said sewing needle at pre-selected positions thereof, d. power transmission means including i. a drive shaft having a drive pulley mounted thereon, said drive pulley being in driving connection with said main motor, ii. a driven shaft telescopically mounted for relative rotation with respect to said drive shaft, said driven shaft having a first pulley mounted thereon in driving connection with said needle drive means and having a second pulley rotatably mounted thereon in driving connection with said auxiliary motor, iii. a first electromagnetic clutch associated with said drive shaft and said driven shaft For selectively connecting said drive shaft in driving connection with said driven shaft upon energization of said first electromagnetic clutch, iv. a second electromagnetic clutch associated with said driven shaft and said second pulley for selectively connecting said driven shaft in driving connection with said second pulley upon energization of said second electromagnetic clutch, and e. control means including i. a first ring formed principally of electrically conducting material and including a relatively small non-conducting portion, said first ring being mounted for rotation with said needle drive shaft, ii. a second ring formed principally of electrically conducting material and including a relatively small non-conducting portion, said second ring being mounted for rotation with said needle drive shaft, iii. a first electrical circuit including two contacts engaging said first ring for selectively energizing said first electromagnetic clutch when both contacts engage conductive portions of said first ring and for selectively deenergizing said second electromagnetic clutch when one of said contacts engages only the non-conductive portion of said first ring at the up position of said sewing needle, iv. a second electrical circuit including two contacts engaging said second ring for selectively energizing said second electromagnetic clutch when both contacts engage conductive portions of said first ring and for selectively deenergizing said second magnetic clutch when one of said contacts engages only the non-conductive portion of said second ring at the down position of said sewing needle, v. switching means for alternately and selectively closing said first and second electrical circuits whereby said second electromagnetic clutch may be energized by either of said first and second electrical circuits.
Claim 2
Dependent Claim
416 words
An attachment assembly operable in a sewing machine for automatically controlling the position of the machine sewing needle comprising, in combination: a. drive means for said sewing needle including a needle drive shaft, b. a main motor for selectively driving said needle drive means, c. an auxiliary motor for said needle drive means to alternatively position said sewing needle at pre-selected positions thereof, d. power transmission means including i. a drive shaft having a drive pulley mounted thereon, said drive pulley being in driving connection with said main motor, ii. a driven shaft telescopically mounted for relative rotation with respect to said drive shaft, said driven shaft having a first pulley mounted thereon in driving connection with said needle drive means and having a second pulley rotatably mounted thereon in driving connection with said auxiliary motor, iii. a first electromagnetic clutch associated with said drive shaft and said driven shaft For selectively connecting said drive shaft in driving connection with said driven shaft upon energization of said first electromagnetic clutch, iv. a second electromagnetic clutch associated with said driven shaft and said second pulley for selectively connecting said driven shaft in driving connection with said second pulley upon energization of said second electromagnetic clutch, and e. control means including i. a first ring formed principally of electrically conducting material and including a relatively small non-conducting portion, said first ring being mounted for rotation with said needle drive shaft, ii. a second ring formed principally of electrically conducting material and including a relatively small non-conducting portion, said second ring being mounted for rotation with said needle drive shaft, iii. a first electrical circuit including two contacts engaging said first ring for selectively energizing said first electromagnetic clutch when both contacts engage conductive portions of said first ring and for selectively deenergizing said second electromagnetic clutch when one of said contacts engages only the non-conductive portion of said first ring at the up position of said sewing needle, iv. a second electrical circuit including two contacts engaging said second ring for selectively energizing said second electromagnetic clutch when both contacts engage conductive portions of said first ring and for selectively deenergizing said second magnetic clutch when one of said contacts engages only the non-conductive portion of said second ring at the down position of said sewing needle, v. switching means for alternately and selectively closing said first and second electrical circuits whereby said second electromagnetic clutch may be energized by either of said first and second electrical circuits.
Claim 3
Dependent Claim
135 words
An attachment assembly as defined in claim 1 and further characterized in that: said telescopically mounted driven shaft has an extending length that is less than the length of said drive shaft; said first electromagnetic clutch includes a first rotatable member secured to said drive shaft at a point adjacent one end of said driven shaft, and a second rotatable member carried on said one end of said driven shaft, said first and second rotatable member being magnetically connected to one another when said first magnetic clutch is energized; and said second electromagnetic clutch includes a first rotatable member secured to said driven shaft, and a second rotatable member carried by said second pulley adjacent said first rotatable member, said first and second rotatable members being magnetically connected upon energization of said second magnetic clutch.