Patent GB-191112202-A (GB)
Title: Improved Yarn Testing Machine.
Inventor: HEIM BENEDICT
IPC: G01N3/08
Filed: 1911-05-20
Granted: 1912-08-20
Abstract: 12,202. Heim, B. May 20. Testing yarns and threads.-In automatic machines for testing and recording the tensile strength of yarns and threads, successive lengths of yarn are fed forwards by intermittently driven rollers and are held in position while they are engaged by a reciprocating arm, which is connected to a weight. The arm is moved until the thread breaks, whereupon a marking- wheel actuated from the moving arm is caused to make a record of the breaking-strain on a moving strip of paper. The thread M is drawn off the cop and after passing through a guide N is fed forwards through rollers G, G<1>, G<2>, the two latter of which are mounted in a pivoted frame F connected by a chain G<3> to a weighted lever H. The projecting end of the thread is lapped round a felt-covered roller J<2>, and is gripped between that roller and a fluted roller J. These rollers are carried by connected levers I, I<1>, and are raised by a cam D engaging a bowl on the lever I until a gear-wheel on the spindle of the roller J engages a gear-wheel on the shaft E<6>, which is driven through bevel-gearing E<4>, E<3> and a chain E from a constantly driven shaft B. The roller J drives the felt-covered roller J<2> by frictional contact, and a driving- part on that roller engages a friction disk on the shaft of the roller G and rotates the delivery rollers. When the roller J<2> is raised by the cam D a link K between the lever I and the lever H raises the latter until a projection H<2> engages a notched supporting-arm O'. This relieves the pressure between the rollers G', G<2>, and G and allows the yarn to be fed forwards readily. The yarn is engaged by a hook R<7> at the end of an oscillating arm R, and is thus drawn out. The arm R is pivoted to a second arm R<1>, and they are rocked about a pivot R<2> by a cam D<1> and a bowl P on a lever P<1>. The arm R is connected to a weighted arm T<2>. When the arms reach a vertical position, a projection C<1> on the worm-wheel C, which drives the cams, knocks away the supporting-arm O<1> and releases the lever H. The thread is then gripped between the rollers G, G<1>, and G<2>, and J, and J<2>, and is strained by the movement of the weighted arm R. The arms R<1>, R now separate, and their relative movement causes the movement, through the sector T<4> and pinion T<5>, of a marking-wheel T<6>. When the thread breaks under the strain, the arm R flies back, and the marking-wheel locked by the pawl U is carried over and depressed upon a moving tape, thus recording the breaking-strain. The various parts are then moved back into position by the cams D, D', and the operations are repeated. The pawl U is raised on the return movement of the marking-wheel to allow the ratchet-wheel U' and the marking-wheel to return to the zero position. The hook R', as it is moved forwards, is moved to one side by a projection R<5>, on the rod R<4> to which it is attached, engaging an incline S. The movements of the lever I<1> are arranged to operate a ratchet traverse motion for the guide N. The device may be arranged to be stopped when a given number of tests have been made. The whole device is enclosed in a locked case A<1>.