GB210060A - Tacking and barring machine - Google Patents

Abstract

210,060. Singer Manufacturing Co., (Assignees of Allen, E. B.). Jan. 20, 1923, [Convention date]. Button-hole sewing- machines. - A machine for barring and tacking is provided with a workclamp comprising jaws which are caused to be approached, so as to contract the end of a buttonhole &c. slit, by means operated by the starting device in moving the stop-motion lever to starting position. The clamping.feet 29 are carried by shanks 28 pivoted to a slide 33 held by a plate 35 on a block 21 carried by an overhanging arm 20. The. slide 33 and feet are adapted to be depressed into engagement with the work by a leaf-spring 44 engaging a lateral extension 43 of the slide and may be lifted out of engagement by the manual raising, through an arm 42, of a bar 41 having a projection 40 which engages a stud 39 on the slide. A bar 23 sliding in a slot in the block 21 is provided at its lower end with wings on which are parallel surfaces 26, 26<1> and inclined surfaces 25 which engage rollers 27 on the shanks 28. When the slide is raised the inclined surfaces . cause the approach of the clamping-feet, the parallel surfaces 26<1> being forced tightly against the rollers. In starting the machine the usual stop lever 10 is shifted by the manual actuation of a. lever 60 by which a rod 55 is shifted to turn a. bell-crank lever 52 and to raise the slide 23 and spread the feet, the slide 23 being retained in raised position after the release of the lever 60 and rod 55 by the jamming of the surfaces 26<1> and rollers 27. When the slide 33 and feet 29 are lifted at the close of a sewing operation the rollers are raised clear of the inclines 25 and the feet are moved apart by a spring 37, the slide 23 and bell-crank lever 52 being returned by a spring 57. A thin blade 48 is mounted on an extension of the slide 33, to assist the operator in correctly placing the, button-hole slit.