GB507139A - Improvements in or relating to blind stitch sewing machines - Google Patents

Abstract

507,139. Sewing-machines. BELLOW, A. Sept. 10, 1937, No. 24671. [Class 112] In a blind-stitch sewing-machine the worksupporting plunger is made in two parts separable laterally so that the work can be passed down between them to a considerable depth in order to allow the seam to be formed at a considerable distance from the edge of the work or from an existing seam. In the form shown, each plunger half 19 is carried on an arm 13 pivotally mounted by means of a pin 12 in a plunger lever 1 which is mounted on a shaft 2 and is biassed by a spring 8 to its uppermost position, this position being determined by an arm 5 on the shaft 2 engaging an adjustable stop 6. The arms 13, which also carry pivoted spring-pressed work-engaging fingers 20, are urged towards one another by a tension spring (not shown), the distance between the plunger members 19 being determined by adjustable stop screws 17 carried by brackets 16 on the arms 13 and engaging the sides of the lever 1. A fixed cam member 18 engages arms 14 on the pins 12 to spread the arms 13 apart when the lever 1 is pulled down by a treadle or other means. In order that one member 19 may be adjusted in height, its arm 13 is pulled downwards by a spring 27 on its hinge pin 12 against a wedge 23 adjustably placed between this arm 13 and the lever 1.