PAPER-HANGINGS 



477 



1589 



connected by its rodj, to the swinging curvilinear rack k, which takes into the toothed 

 wheel I, that turns freely upon the axle of the feed-drum e, e. From that wheel the 

 arms, m m, rise, and bear 

 one or more palls, n, which 

 work in the teeth of the 

 great ratchet-wheel o o, 

 mounted upon the shaft of 

 the drum e. 



The crank-plate g being 

 driven round in the direc- 

 tion of its arrow, will com- 

 municate a see-saw move- 

 ment to the toothed arc k, 

 next to the toothed wheel 

 I, in gearing with it, and 

 an oscillatory motion to 

 the arms m m, as also to 

 their surmounting pall n. 

 In its swing to the lei't 

 hand, the catch of the pall 

 will slide over the slope 

 of the teeth of the ratchet- 

 wheel o ; but in its return 

 to the right hand, it "will 

 lay hold of these teeth, 

 and pull them, with their 

 attached drum, round a 

 part of a revolution. The 

 layers of paper in close 

 contact with the under 

 half of the drum will be 

 thus drawn forward at 

 intervals, from the reels, 

 by the friction between its 

 surface and the endless 

 felt, and in lengths corre- 

 sponding to the arc of 

 vibration of the pall. The 

 knife for cutting these 

 lengths transversely is 

 brought into action at the 

 time when the swing arc is 

 making its inactive stroke, 

 viz. when it is sliding to 

 the left over the slopes 



of the ratchet-teeth o. The extent of this vibration varies according to the distance 

 of the crank stud i, from the centre, /, of the plate g, because that ddstance regulates 

 the extent of the oscillations of the curvilinear rack, and that of the rotation of the 

 drum e, by which the paper is fed forwards to the knife apparatus. The proper 

 length of its several layers being by the above-described mechanism carried forward 

 over the bed, r, of the cutting knife or shears r, v, whose under blade, r, is fixed, the 

 wiper s, in its revolution -with the shaft/, lifts the tail of the lever t, consequently 

 depresses the transverse moveable blade v(as shown in Jiff. 1591), and slides the slant- 

 ing blades across each other obliquely, like a pair of scissors, so as to cause a clean 

 cut across the plies of paper. But just before the shears begin to operate, the trans- 

 verse board, , descends to press the paper with its edge, and hold it fast upon the 

 bed r. During the action of the upper blade v, against the under r, the fall board u 

 is suspended by a cord passing across pulleys from the arm y of the bell-crank lever 

 t, t. Whenever the lifter cam, s, has passed away from the tail of the bell-crank t, 

 the weight z t hung upon it, will cause the blade v and the pinching board u, to be 

 moved up out of the way of the next length of paper, which is regularly brought 

 forward by the rotation of the drum e, as above described. The upper blade of the 

 shears is not set parallel to the shaft of the, drum, but obliquely to it, and is, more- 

 over, somewhat curved, so as to close its edge progressively upon that of the fixed 

 blade. The blade v may also be set between two guide pieces, and have the necessary 

 motion given to it by levers. 



PAPER-HANGINGS, called more properly by the French, pajticrs peints. The 



