Patent GB-417589-A (GB)
Title: Improvements in guards or shields for the operating parts of carding engines and like machines
IPC: F16P3/08
Filed: 1933-01-31
Abstract: 417,589. Machinery guards. FAIRBAIRN LAWSON COMBE BARBOUR, Ltd., Wellington Foundry, and BEE, J. R., 7, Simpson Street, Armley Road, both in Leeds. Jan. 31, 1933, No. 2943. [Class 80 (iv).] A carding-engine or like machine is provided on its driving side with protecting grilles 2, 2<a>, Fig. 10, the grille 2 being fixed to the machine while the grille 2<a> can be removed vertically. On the opposite side the machine is provided with grilles 112, 112<a>, Fig. 8, mounted to slide horizontally one behind the other. The lower rails 2b, 2<c>, Fig. 3 of the grilles 112, 112a have openings 4, 4a engaged by locking bolts 3, 3<a> carried by arms 6, 6<a> mounted on shafts 7, 7<a> carrying arms 8, 8<a> the slotted ends of which are engaged by pins 9, 9<a> on a bar 10 slidably mounted in the framework of the machine. The locking bolts 3, 3<a> are actuated by a handle 12 on the shaft 7<a>. A wheel 23 driven directly or through gearing from a convenient rotating part of the machine carries a brake band 19 encircling a disc 17 loosely mounted on a shaft 18; a crank pin 17<a> on the disc 17 is pivotally connected to the upper end of a rod 16, the lower end of which is secured to an arm 14<a> secured to a hub having another arm, the end of which is formed as an inclined stop surface 13<a>. While the machine is working, the disc 17 is frictionally acted upon by the rotating brake band 19 and the rod 16 is held depressed, in which position the stop 13<a> engages a pin 10<b> on the sliding bar 10 ; a pin 9<b> on the other end of the bar 10 then engages the framework, so that the bar 10 is held immovable, and the handle 12 cannot be operated to unlock the grilles 112, 112<a>. When power is shut off from the machine, the wheel 23 continues to rotate due to the momentum of the rotating parts of the machine, and during this period the grilles are still locked ; when the wheel 23 comes to rest, however, the rod 16 is raised by a spring 17b, disengaging the stop 13a from the pin 10<b> and permitting the unlocking of the grilles 112, 112<a>. The shaft 7<a> carrying the handle 12, carries a lever pivotally connected to the lower end of a rod 25, Fig. 6, the upper end of which is connected to a pivoted lever 26. When the handle 12 is operated to unlock the grilles 112, 112<a> the free end of the lever 26 engages an opening 28<a> in a sliding bar 28 carrying the belt shifting fork. Until the grilles 112, 112<a> are replaced in their protecting positions the handle 12 cannot be operated to free the bar 28, so that the machine cannot be restarted. Means are also provided to prevent the re-starting of the machine while the grille 2<a> is out of position, as described hereinafter. The top cross bar 2<w> of the vertically movable grille 2<a> carries a hook 30 having a notch which is engaged by a catch plate 31 slidably mounted on the upper cross bar 2<x> of the fixed grille 2, so that the grille 2<a> cannot normally be lifted out of position. When the rod 25 is depressed as described above, an inclined face 29<a> on an arm 29 carried by the rod 25 slides the catch plate 31 to disengage it from the notch in the hook 30, so unlocking the grille 2<a>. As the latter is removed, an inclined face 30b on the hook 30 moves the plate 31 still further, causing it to engage a notch 29<c> in the arm 29, thus locking the rod 25 and preventing re-starting of the machine while the grille 2<a> is out of position. During the replacement of the grille 2<a> an inclined face 30<c> on the hook 30 moves the catch plate 31 back again, releasing the hook 29. When the rod 25 is moved upwardly, an inclined face 29b on the arm 29 moves the catch plate 31 still further to engage the notch in the hook 30 and so re-lock the grille 2a.