Patent GB-190814628-A (GB)
Title: An Improved Duplicating Attachment for use in connection with Sewing Machines.
Inventor: MCCAW FREDERICK
Filed: 1908-07-10
Granted: 1909-04-08
Abstract: 14,628. McCaw, F. July 10. Grouped machines; feed; work-supports.-To produce a series of duplicates from one pattern by means of a number of sewing-machines, a frame is provided which is capable of universal movement and moves the work under the several machine heads similarly and simultaneously, the frame being also capable of either longitudinal or lateral reciprocation in synchronism with the needle-bars, such reciprocation being adjustable to vary the length of the stitches. Fig. 2 is an elevation of three machines supplied with this attachment, and Fig. 4 is a sectional plan on the line Y-Y, Fig. 2. The machines a are mounted on a bench A and are driven from a shaft c, to produce the required pattern on the work which is held in hoops e placed above the bed-plates f, which hoops are rotated by gearing and telescopic connexions from the countershaft c<1>, a double friction clutch n<8> being provided on the connexion, so that rotation may be produced in either direction as desired. The connexion also includes a Hooke's or other universal joint to allow of the transmission of the rotation in any position of the movable frame g, in which the hoops are mounted. This frame has at one end a part g<1> projecting into a slotted cross-bar g<2>, which is movable longitudinally in guides g<3> by means of a screwed spindle i working in a bearing i<1> and rotated in either direction from the shaft c' when one of the disks i' of a friction clutch is operated by suitable means. The frame g is supported between rollers h<2> on standards h<1> projecting from a lower frame h, which is capable of being moved laterally by similar connexions and clutches, as shown in Fig. 2, being for this purpose supported on rollers h<3> working in slots in the standards B of the frame A. The longitudinal vibrating motion is given to the frame from a crank-disk k<5> driven from the shaft c, through a connecting- rod k<4> and an oscillating rod k<3>, the motion being imparted therefrom to a slotted disk k<2> mounted on a vertical rod k. A pin k<7> on the shaft k<3> projects through a slot in a collar k<8> on the extension j<2> of the spindle i, and the rod k is provided with a spring and is given an up-and-down movement by connexions l<1>, l<4> actuated by the operator. The arrangement is such that, when the centres of the disk k<2> and pin k<7> coincide, no movement is transmitted, but, when the lever k is lifted by the operator, a reciprocation takes place the amount of which is regulated by the distance between the centres. The shaft j<2> is connected to the spindle i by means which allow of the vibrating movement being given without interfering with the rotary movement. Similar mechanisms are provided in connexion with the lateral spindles i to give the required lateral reciprocations. The regulation of these reciprocations allows of the alteration of the length of the stitches. To enable the operator at the table C, which is mounted at the end of the frame and rotates with the hoops, to follow the pattern thereon and to vary the position of the hoops and frames, a horizontal rod p carrying a pointer p<1> is attached to the frame. The hoops are fitted in casings which are screwed together, and are provided with guide-pinions as well as driving-pinions, by means of which they are driven from the shaft n<6>. Fig. 10 shows a modified form of frame, in which the upper frame g is arranged close to the lower frame h and works on bearings r, the hoops being in this case mounted on vertical shafts. The hoops may also be formed in four parts forming four separate work-holders, each having its own hinged binder for holding the work. Again, the bench may be double and in this case the hoops of four machines may be arranged round and simultaneously driven from one pinion. The hoops, which may be quadrantshaped, may also be driven by worm or screw gearing. Needle-bars, vibrating laterally.- With machines having hinged needle-bars, these bars may be driven from a common shaft and vibrated by means similar to that used for vibrating the frame ; in this case it is unnecessary to vibrate the frame laterally, as the length of stitch in this direction may be varied by altering the throw of the needles.