Patent GB-735073-A (GB)
Title: Improvements in and relating to boot or shoe sole sewing machines
IPC: D05B55/06
Filed: 1953-01-12
Abstract: 735,073. Sewing-machines. JUNKER & RUH AKT.-GES. Jan. 12, 1953 [Jan. 10, 1952], No. 933/53. Class 112. A boot-sole sewing- machine has a curved eyed needle which feeds the work in a straight line; no awl is used. Members are provided to support the needle against lateral stresses. Lock-stitching; needles; needle-guides; presser-feet. In the outsole sewing-machine shown, the needle 1 which has a thread groove along its outer side, is secured to a carrier 17 oscillating with an axiallymovable shaft 7; the carrier may be made of spring plate, or be otherwise elastically deformable laterally, and is oscillated by a rod 18 from a crank on the main shaft of the machine. The needle is projected further into the work during the feed movement. The shank of the presserfoot 6 is formed into a part-cylindrical member 5 which supports the needle on its outer side, and this support is continued beneath the work 9 by a part 13 of the work-support 11. The presserfoot and work-support are slotted to allow the feed movement of the needle. A needle-guide 4, mounted on the shaft 7 for axial movement with it and connected to the needle carrier 17 through a spring 3, has its end forked to embrace the needle, 'and fits close to the member 5 to form an eye supporting the needle. The needle is supported on its inner side below the work by contact with the shuttle cap 15, the shuttle guiding rib 16 being displaced from a central position to permit this. In a modification, the shaft 7 does not move axially, and the needle-carrier and other parts are able to move along it for the feed movement. Feed; channelling. All the parts taking part in the feed movement of the needle are carried by the shaft 7 and receive the feed movement from this shaft, which is reciprocated axially by a cam on the main shaft acting through two levers connected at a point which is adjustable along their length to provide a variable feed. The needle is. assisted in feeding the work by a member (not shown) below the work, which moves along its axis with the shaft 7. and against which the needle is deflected by contact with. the shuttle cap 15. This member also carries the channelling knife (if used), which is constantly in contact with the work and which cuts the channel on the return movement after the feed, the work being bulged through the aperture in the worksupport by the presser to facilitate the channelling. The channel knife may be of any required section according to the form of channel desired. Pressers, periodic control of. The presser-foot is raised during the feed of the work, and is then released to fall on to the work under spring pressure. Its downward movement may be limited to avoid damage to soft material. In the machine described a cam on the main shaft acts on two follower levers, one of which lifts the presser, against a spring, through a pair of toggle links while the other breaks the toggle to allow the presser to fall on to the work at a moment which is determined by an adjustable connection in the mechanism; the toggle is restored by a spring. In a modification, the presser may be lifted by mechanism including a pawl which is tripped to allow the fall of the presser.