Patent GB-353142-A (GB)
Title: Improvements in or relating to apparatus for the linear measurement of strip material
IPC: G01B5/04
Filed: 1930-05-17
Abstract: 353,142. Measuring continuous lengths. MAZZUCCHELLI, V., 17, Via Aurelio Saffi, Milan, Italy. May 17, 1930, No. 15236. [Class 42 (ii).] A linear measuring apparatus for strip material and comprising a revolutions counter is provided with devices for showing simultaneously the length that has been unwound from the winding-off roll and that which remains to be unwound to complete a predetermined length, with devices for actuating a signalling device when the predetermined length is near completion and for stopping the machine when the length is completed, and with zeroizing means for the several devices. An ordinary revolutions counter comprising numeral wheels for fractions of a unit, units, tens, hundreds, &c., is driven from the unwinding roll by gearing which may be varied to adjust the actual unit measured by the counter and thereby the accuracy of the measurement. Each drum on the counter carries two sets of figures, one arranged in increasing sequence in the direction of relation and the other, mounted on a sliding ring, arranged in the opposite direction. When the first set s arranged at zero, the second is arranged at the number corresponding to the length to be wound off and while the first set registers the amount wound off, the second set indicates the amount vet to be wound. To indicate the approaching completion of the operation and to stop the machine on the actual completion, each counting drum carries a tooth 2 for each of the two devices, one tooth engaging a spring-pressed lever 4 having a hook 4<1> which engages a projection on an upper sprirg-loaded drum 6 and the other tooth a similar lever having a hook 4<11> engaging a projection on a lower drum 6. When all the hooks 4<11> are freed from the projection by the simultaneous action of the teeth 2 on their corresponding levers 4, the lower drum 6 is released and its rotation actuates a signalling device, similar later action on the upper drum 6, causing mechanism for stopping the machine to operate. The teeth 2 are set in the counting drum opposite to the required figure either by pushing or screwing them into holes provided there or by mounting them on displacable flexible rings which permit them to be lifted from sockets in the counting drum and to be replaced in others. Alternatively, the counting drum may carry a notched disc in the desired notch of which a pawl may be engaged. Zeroizing mechanisms. Each counting drum carries a pawl 12 adapted to engage a groove 11 in the spindle 10 on which the drums are mounted and a disc 13 solid on the spindle 10 is formed with a cam recess 14 in which the spindle 15 of the transfer mechanism of the drums rests. On rotation of the spindle 10, the spindle 15 is moved outwards, disengaging the transfer mechanism and the groove 11 picks up the pawls 12 and so rotates the drum until the zeroizing is effected. The spindle 10 may carry a cam 28, Fig. 10, adapted to engage a frame 25 carrying an arm 24 pivoted at its other end to a crank pin 23 within the drum 6 so that the drum 6 is simultaneously re-set, but the drum 6 may be re-set independently of the counting drum by a crank secured to its shaft.