Patent GB-190728401-A (GB)
Title: Improved Automatic Embroidery Machine.
Inventor: PARKES WILLIAM NELSON
Filed: 1907-12-24
Granted: 1908-04-16
Abstract: 28,401. Parkes, W. N. Dec. 24. Ornamental-sewing machines. - A machine for sewing scallop embroidery is provided with two needles reciprocating in a fixed frame and having lateral vibrations of different extent, and a work-carrying frame, which is mounted to revolve with either uniform or variable velocity upon a table running upon a track and provided with means for obtaining vibratory movements of relatively long and short periodic times. Needle-bars, vibrating laterally.-Tbe needle 51 is carried by an arm 50 on the main needle-bar 34, which is oscillated about its own axis by means of a vibrating lever 40, a pin 41 on which slidingly engages with an arm 42 on the needler-bar. The second needle 60 is similarly carried by a bar 58 mounted in the hollow needle-bar 34. A spring 66 secured in the hollow needle-bar 34 presses upon an arm 68 of the needle-bar 58 and tends to keep the needle-arms in contact. A fixed rod 72 forms a stop for the arm 68. The bar 72 may be adjusted to limit or entirely prevent the lateral vibration of the needle 60. Feed ; work-supports.-The work-carrying frame 130 is mounted upon a frame 91 and is rotated through gearing from a ratchet-wheel 105. The frame 91 is provided with rollers, which run upon tracks 94. It is reciprocated by a crank-disk 153, is mounted on the fixed table 25, and is also independently reciprocated by a vibrating quadrant 141, mounted upon the frame 91 itself and forming part of the connexion between the frame and the disk 153. The ratchet-wheel 105 drives the frame 130 through the gear shown in Fig. 6. The gearwheel 117 is connected to the gear-wheel 129 by a block 123, which is pivoted on the wheel 117 and slides in a slot in an arm 125 secured to the wheel 129. If the axes of the two wheels are coincident, the frame is rotated uniformly. In order to produce a changing velocity, the wheel 117 is mounted upon an arm 115 so that it may be placed in a position eccentric to the wheel 129. The ratchetwheel 105 is actuated by a pawl lever 103, which is oscillated by connexion to a shaft 88, also mounted upon the moving frame 91, but oscillated by a lever 83 on a shaft 81, mounted upon the fixed table 25 and oscillated by a cam on the machine shaft. The quadrant 141 is oscillated by a camgroove 139 in a ratchet-wheel 138, actuated from the shaft 88 by a crank and-pitman connexion 140. The quadrant is connected by a pitman 145 to a slotted slide 147, which is connected to an adjustable crank-pin 154 on the disk 153. This disk is rotated through gearing by a ratchet-wheel, which is actuated from the shaft 81. The work is stretched over a hoop 135 and is held by a second hoop 133 sprung over it. The engaging - surfaces of the hoops are faced with india-rubber. The hoops are placed in a circular recess in the rotating frame, and a catch ensures a positive rotation. For producing simple scallops upon a circular material, the crank-pin 154 is placed in an inoperative position. For producing compound scallops, as shown in Fig. 17, all the motions are used, and the rotation of the work-carrying frame is uniform. When embroidering along the sides of a square, to produce scallops of equal pitch at the corners and at the centres of the sides, the speed of rotation of the frame should increase as the stitching approaches the centres. This is obtained by the gear shown in Fig. 6. Cords, applying.-Cords or other fillings may be fed under the stitches. Presser lifted automatically.-The presser is lifted to free the work during the feed by a simple cam-operated lever.