Patent GB-190222930-A (GB)
Title: Improvements in Automatic Stop-mechanism for Paper Feeding, or other, Machines.
Filed: 1902-10-21
Granted: 1902-12-18
Abstract: 22,930. Lake, H. H., [Economic Machine Co.]. Oct. 21. Feeding sheets; stopping and starting apparatus. -Relates to stop mechanism for sheet-feeding and other machines, for stopping the machine when two sheets, or an abnormal thickness of material, are fed. Fig. 3 shows a sectional elevation of apparatus used with a paper-folding machine. The sheets, as they are fed from the pile to the roller S and drop rollers S<1>, pass between a lower stationary piece B and an upper revolving detector or calipering-member C. The member C moves over the paper when the latter is at rest, before the rollers S<1> drop. The detector C, Figs. 6 and 7, consists of a curved arm pivoted at d on the lower end of an arm D on a shaft e geared to a shaft e<3> driven by a chain f <1> from the shaft f. Stops c, c<1> on the lever C limit its movement on its pivot d. A knifeedge c' on the detector C engages a groove in the short arm h of a lever H pivoted at h<1> in the revolving arm D. The lever H is pressed, by a spring i, against a stop i<1>. When only one sheet is fed, the detector C sweeps over it, but, when two or more are fed, the detector is moved on its pivot, and presses up the arm h, thereby moving the upper end h<3> of the lever H to the rear (to the left of Fig. 6). When so moved, the flared edge h<5> on the lever end h<3> engages the flared edge of a curved arm K, Fig. 10, pivoted at m on a projection of the bracket L carrying the shaft e and arm D. The bracket L is adjustable up and down by a screw and spring, for adjusting the distance of the detector C from the fixed member B, and the spring may yield in case the detector encounters an undue thickness of material. The pivot of the arm K is adjustable longitudinally by a screw M, so that the arm may be moved into exact portion for engagement of the flared edge h<5>. The arm K is connected by a rod to a bolt, which slides in the framing, and which normally projects into a hole in a block p<3> pivoted at p<5>, and holds this block in raised position. When the arm K is rocked by the lever H, the bolt is withdrawn, and the block p<3> is free to fall, when a roller q thereon encounters a depression in the cam Q. The cam Q has a raised portion q<2>, which raises the block p<3>, and relieves the bolt of its weight during the time that the bolt may be withdrawn by the operation of the arm K. The lower arm of a weighted elbow-lever p' rests on the block p<3>, the other arm being connected by a rod p<1> to the arm p of a weighted elbow-lever P, loose on a shaft n, and having a pin n<1> projecting over an arm n' fixed on the shaft n. On the shaft n is also fixed a clutch-operating crab G, of well-known construction. The clutch shown comprises a driven wheel f<5>, loose on the shaft f, carrying a pawl g<1> normally engaging a notch in a disc g keyed to the shaft f. The pawl g<1> has a slot engaged by a pin on a disc o<2> pivoted on the wbeel f and held in either of two positions by a spring rod o<6>. On the disc o<2> are two pins o<4>, o<5>, which, in the normal driving position, run clear of the arms of the crab G. When the crab is rocked with the shaft n, on the withdrawal of the bolt by the arm K, it is in position to engage the pin o<4> and rock the disc o'to lift the pawl g<1> out of the notch in the disc g, and thereby stop the machine. The crab is returned to normal or starting position by hand operation, and in this position it engages the pin o<5> and rocks the disc o<2> to engage the pawl g<1>. The shaft n and crab may be moved by hand by means of a rod n<4> connected to an arm n<3> on the shaft n. After operating the crab G, the lever P, block p<3> and parts connecting them, are returned to normal position by the cam Q. The drop rollers S<1> are prevented from falling, when the machine is stopped, by an arm u on the shaft n, which is moved into the path of an arm t<1>, pivoted at t<2>, and connected by a rod t to an arm T on the shaft s<1> of the drop-roller arms s. If desired, the stopping- mechanism may be operated electrically, the arm K acting to close the circuit at the contacts r<1>, r<2>.