Patent GB-190428927-A (GB)
Title: Improvements in Embroidering Machines.
Inventor: FAIRWEATHER WALLACE
Filed: 1904-12-30
Granted: 1905-10-05
Abstract: 28,927. Fairweather, W., [Singer Manufacturing Co.]. Dec. 30. Ornamental-sewing machines; lock-stitch shuttle sewing- machines ; cords, applying ; multiple-needle machines; needle-driving; feed.-Relates to a twoneedle machine employing a vibrating threadcarrier which weaves an embroidery thread back and forward between two rows of stitches, by which the thread is secured to the face of the work. Plain or fancy scallops and other fancy figures may be produced. The needle-bars are mounted in a frame secured to a bar 27, Fig. 1, which is reciprocated laterally by means of a stud 26 and grooves 25 at the back of a cam-wheel 23. The cam-wheel is intermittently rotated by the lever 19 and silent ratchets 22, the lever 19 being reciprocated by a cam on the main driving-shaft. The bar 27 is also connected to the shuttle mechanism, the shuttle thereby being always situated in the same lateral relation to the needles. In order to provide for a proper timing of the two needles relative to the shuttle, one of the needles is attached to an auxiliary bar yieldingly mounted on the main needle-bar and governed by a stop which will arrest its descent before the main needle has quite completed its downward movement, and one needle will thus be caused to pause momentarily while the other needle, the loop on which is first taken by the shuttle, completes its downward, and commences its upward, movement. By this arrangement, the two loops are the same size when taken up by the loop-taker, and the " skipping " is thereby prevented. The shuttle is reciprocated through a series of rock-shafts driven by a crank on a vertical shaft geared to the main driving- shaft. The arm 47 embraces a stud 48, the length of which permits of the lateral movement of the shuttle already described. The feed-bar is operated in a well-known manner by a reciprocating lever 51 yoked to an eccentric 53 on the vertical shaft. The fulcrum on which the feed-lever vibrates is attached to the laterally - reciprocating shuttle mechanism so that the feed is automatically varied in such a manner as to lessen it towards the points of the scallops, which are thereby well covered by the embroidery. The lever 60 is universally jointed at its upper end to the frame of the machine, and carries at its lower end the embroidery thread-carrier 61, which swings back and forward in front of the needles. This carrier is mounted to slide vertically in the lever 60, and is pressed downwards by a spring. A projection 63, Fig. 4, rests on a shank 64 attached to the presserbar, so that when the latter is raised the threadcarrier is also lifted out of the way. The lever 60 is operated through the lever 71 by a cam-actuated pitman. The lever 71 is connected at its lower end to the needle-bar frame by a swivel stud, and at its upper end to a stationary semicircular cam 77 by a roller stud 76. By these means the threadcarrier follows the lateral step-by-step movements of the needles, and also has a curved path, caused by the action of the cam 77, so that, when it pauses while the needles are descending, it will be slightly behind the needles. The embroidery thread or cord runs from a spool 79 through a tension device 80, and thence through suitable guides to the carrier. The arm 89 tightens the bights of thread interwoven with the needle-threads, and at each stitch draws a new supply of thread from the spool. Interchangeable cam-wheels 23 are provided to vary the pattern of embroidery.