GB1343702A - Sewing machines - Google Patents

Abstract

1343702 Sewing machine FRITZ GEGAUF A G BERNINA NAHMASCHINENFABRIK 19 April 1971 [6 Feb 1970] 20181/71 Heading D1G A sewing machine has a releasable winding mechanism comprising a winder shaft 15 disposed on a fixed axis with a pin 14 for receiving a bobbin 13, a friction driving wheel 24, 25 mounted on a wheel shaft 21 mounted so that its axis may be laterally displaced between an operating position (full lines) and a rest position, (phantom) connecting means being provided between the shafts to maintain connection between them throughout movement between the positions. As shown the connecting means comprise plastics discs 19, 27 secured to a respective shaft and presenting a groove 20 embracing a pin 28. Alternatively the groove may be replaced by a bore or the shafts may present cams engaging each other. The shaft 21 is mounted in a winder arm 23 biassed by a spring 31 into the operating position wherein the friction wheel 25 engages the arm shaft wheel 3. A strong flat spring 40 normally engages the arm 23 to overcome the spring 31 and urge the winder shaft to the rest position. To enter the operating position a release arm 34 pivoted at 36 is swung towards shaft 21, a pin 37 on the arm 34 engaging a ramp 41 on spring 40 to remove the latter from the arm 23, spring 31 then urging the latter towards the drive wheel 3. When the bobbin is wound the rising level of thread thereon abuts a sensing member 32 pivoted to arm 34 to swing the latter back, the released spring 40 engaging arm 23 to overcome spring 31 and move the winder to its release position. The pivoted arms 23, 34 may be replaced by rectilinearly moving slides.