Patent GB-190920214-A (GB)
Title: Improvements in Needle Thread Guiding Devices for Shuttle Embroidery Machines.
Inventor: BROUGHAM FREDERICK JOHN
IPC: D05C11/08
Filed: 1909-09-03
Granted: 1909-11-25
Abstract: 20,214. Brougham, F. J., [Saurer, A., (Firm of)]. Sept. 3.. Embroidery machines.-In shuttle embroidery machines, a clamping-device is provided for each thread and a rocking thread conductor is arranged between these devices and the spools. This conductor regulates the thread tension, being provided with a brake for each thread, by means of which the thread conductor is moved by the combined pull of the threads against a brake resistance on the shaft, at the same time permitting an equalization of tension in the separate threads. The needle-bar 1, Fig. 1, is operated through a link 5 from an operating-lever 3 mounted on the shaft 4, while the piercer-bar 2 is operated from the lever 9. The braking-devices are mounted on a shaft 11, and each has a friction disk 12 with a roughened peripheral furrow loosely mounted on the forked end of an arm 13 and yieldingly held by a forked spring 14. The near end of the shaft 11 carries a brake disk 15, Fig. 8, acted on by a block 16, carried by a lever 17, under the action of a spring 18, the tension of which is adjustable by the lever 21. The shaft 11 also carries arms 22 which are acted on, to rotate the shaft by arms 23 on the shaft 4, the movement being limited by a stop bar 24. This bar carries the clamping-devices, which consist of fixed disks 25, Fig. 7, mounted on arms 27 and lying against springs, and axially-movable disks 26 mounted on a common bar 28 which is movable against the action of the springs. The threads n pass from the spools 10 through eyes 29, 30, and are laid once round the disks 12 and then passed between disks 25, 26 and over the thread conductors 7, 8 to the needles. When the needle-bar moves towards the work s, the conductors are partly rotated about the shaft 11, but at the same time only the threads under tension greater than normal are able to rotate their disks 12. The tension is thus equalized before the threads are clamped by the disks 25, 26, after which the arms 23 contact with arms 22 and return the conductors from position II, Fig. 1, to which they have been moved, to the normal position I, the threads during this movement turning the disks 12 while being drawn off the spools. When piercing, the length of thread drawn off is generally greater, and thus the first movement turns the conductors further over; and when the needles are next moved forwards, the arms 23 immediately begin to return the conductor so that the extra thread will be taken up by this movement before the clamps 25, 26 act. In the modification shown in Fig. 10, all the resistances of the brake devices of the conductor are capable of being regulated simultaneously, and for this purpose arms 31, 31<1> are fixed on the shaft 11 and carry an axially movable shaft 32, upon which pairs of brake disks are loosely mounted. A spring 34 inserted between two pairs of disks presses them against a collar 35 at one end, or the arm 31<1> at the other, and a regulating-wheel working on a screwed part of the rod 32 regulates the resistance. To ensure the movement of the shaft 32, it is provided at the end with a collar 37 and a spring 39 arranged between loosely-mounted stops 38.