Patent GB-190302299-A (GB)
Title: Improvements relating to Sewing Machines
Inventor: STEWART-WALLACE JOHN STEWART
Filed: 1903-01-30
Granted: 1904-01-21
Abstract: 2299. Wallace, J. S. Stewart-. Jan. 30. Overedge-stitching machines; ornamental-sewing machines; blind-stitching machines; attachments, securing.-Relates to a sewing-machine attachment whereby felling, overseaming, hemming, blindstitching, stoating, and ornamental sewing, &c. may be performed. The attachment is mounted on a plate a<11> which fits in grooves in the workplate of the machine. The work is displaced from the path of the needle b, as frequently as desired, in the present case at alternate stitches, by a sliding pusher a arranged close to the inner edge of a casing a<13>, and actuated by a revolving pinwheel a', which receives an intermittent motion by means of a resilient projection a<2> mounted on a vibrating shuttle carrier D and working in a segmental slot ax. The resilient projection a' consists of a spring-controlled vertical sliding piece, Fig. 6, mounted in a frame a<10>, which is attached to the shuttle carrier D by a screw. The upper end of the sliding piece is inclined, so that, as the shuttle carrier D moves towards the pinwheel, the sliding piece strikes against one of the pins of the pin-wheel and is depressed, passing on to the other side of the pin, and being then raised by a spring a<9> through a distance limited by a collar a<12>, so that as the shuttle carrier D returns, the head of the sliding piece moves the pin-wheel on a step, a spring-controlled retaining-pawl preventing the pin-wheel from returning. The sliding piece is formed with a shoulder adapted, when the sliding piece is pushed downwards, to engage with the frame a<10> and hold the sliding piece in an inactive position, or the sliding piece may be threaded at its lower end so that the collar a<13> acting as a nut, may turn the sliding piece into an inactive position. In another form, the upper part of the resilient projection is hinged and turns against the resistance of a spring, and, when out of action, it is turned down and held by a catch on the frame a<10>. The pin-wheel a' is arranged with alternate long and short pins, and, as it revolves, the long pins actuate an incline a' attached to the pusher a, moving the latter forward until the incline a<7> is released, when a spiral spring a<4> arranged parallel to or surrounding the pusher a returns the latter to its inoperative position. In another form, the spring a<4> is dispensed with, and the pusher a returned to its inoperative position by a star-wheel a<15>, Fig. 9, controlled by a spring pawl a<17> and placed close to a curved end of the incline a'. After a long pin of the pin-wheel a<1> has escaped from the incline a<7>, it strikes one of the arms of the star-wheel, so as to move the latter in the opposite direction to the pin-wheel, and cause the return of the pusher a. Presser feet.-For use with the attachment, the machine is preferably provided with a presser-foot consisting of a plain bar c secured to a presserfoot bar by a screw C', the side of the presser-foot being recessed at c<2>, Fig. 1, to allow sufficient room for the work to be displaced by the pusher a. Attached to the presser-foot is a hinged piece c', Fig. 6a, adapted to move in or at right-angles to the plane of the pusher a, and pressed towards the work-plate of the machine by a spring c<7>. The piece c' has an eye c<8> with which a projection on the pusher a engages during its forward movement. An adjustable work-guide is secured to the presser-foot by a thumb-screw c<5> passing through a slot in a lateral extension c<4> of the guide, which extension lies in a dovetail groove in the presserfoot. Instead of mounting the guide on the presser-foot, it is preferably adjustably mounted on a presser-foot bar C, Fig. 7<a>, in which case the part c<6> carrying the vertical portion c<3> is arranged so that it will lie ont of the way of the pusher a and is provided with a slotted extension, as before. A light narrow spring c<x> carried by the guide presses down upon the material when silk &c. is being operated on. The guide may also be carried by the casing of the attachment, or the plate a", or any other part of the machine. As the needle-bar vibrates, it imparts motion, by means of a pin engaging with a slotted arm, to a crank-arm f Fig. 12, which actuates a member f<6> of a bell-crank lever f<6> , f<6x>, the other member f<6x> of which turns a double-armed rotary piece f<5> slightly about its axis. A radial arm f<3> is mounted on the same axle f<4> as the piece f<5>, and revolves with it, and, during its rotation, it oscillates a hinged or pivoted V-shaped piece f, f<1>, near the free end of the member f of which is a projection f<x>, which actuates the pusher a. The plate a<13> to which the V-shaped piece is attached is connected to the sliding plate a<11> of the machine. In another modification, Fig. 17, the pusher is actuated directly from the radial arm f which, together with the piece f is operated by a rectilinear slide f<10> vibrated by a slotted arm f<11> pivoted at e to the head of the machine, and oscillated by a pin b<1> carried by a projection b<2> on the needle-bar B. As the needle descends, a aleeve f<14> turns about a pin f<15>, and a rocking finger f<13> forming part of the sleeve f 14 is shifted out of the path of the rotary piece f<5>, causing the pusher a to displace the work, as before.