Patent GB-190927944-A (GB)
Title: Treadle Operated Machines for Setting Staples and the like.
Inventor: ELLIOTT WILLIAM ELIJAH
IPC: B27F7/17
Filed: 1909-11-30
Granted: 1910-08-25
Abstract: 27,944. Elliott, W. E. Nov. 30 Stapling. - A treadle-operated machine for setting staples, rivets, &c. has means for controlling the extent and character of the movement of the driving-means. The machine comprises a clinching-anvil 2 on which the work is placed, a guide 3 having a loose connexion with the driver 6 and moving up and down with it, and an operating-arm 8 coupled to the driver and actuated by a treadle. A lever 12 is coupled to the staple-guide 3, and actuates a cam 11 to place a stop 10 on a sliding radial link on the cam axis at a point on the path of a lug 9 on the arm 8, corresponding to the position of the staple-guide when it rests upon the work. This stop prevents the driver from being actuated further than is necessary to set the staple. The staples are held in holes around the circumference of a disk 46, preferably of pasteboard, which is held upon a table 15, attached to the guide 3, by a pivoted spring arm 18 carrying a stud 43 which passes through a hole in the centre of the disk 46. A ratchetdisk 16 is secured to this stud, which may rotate in the arm 18, carrying the disk 46 with it by reason of a pin beneath the ratchet-disk, which engages a hole in the disk 46. To feed the staples to the guide 3, a pawl 20 guided by a member 41 engages the teeth of the ratchet-disk, which correspond in number to the holes in the staple-carrier. The pawl is actuated by a lever 31, which has a cam 32 on its upper end. This end is guided in a slotted bracket 33 on the arm 8. As the arm 8 rises, the pawl 20 advances to feed a staple. The stroke of the pawl exceeds the distance between two adjacent ratchet teeth, and the staple disk is stopped when a staple contacts with the staple-guide 3, on one side of which is an opening to admit the staple. This stops the pawl and the lever 31, and, if no staple has been fed by this movement, the lever 31 continues its motion, making its full stroke. A notch 34 on the lever 31 then comes beneath a projection in the slotted bracket 33, and the arm 8 is prevented from descending to operate the driver until the lever 31 has been rocked by hand to feed a staple. A slotted link 38, connected through a bell-crank and a spring on the lever 31, urges this lever rearwards at the end of each upstroke of the arm 8 to ensure the feeding of the staple. The driver cannot make a partial downstroke, and cannot be driven downwards during the feeding of a staple. A projection from the arm 8 carries a spring-controlled double-acting pawl, the dog 28 of which is urged against a rack 25 during the downstroke of the driver; hence, if the treadle is released to allow the arm 8 to move upwards during the driving of a staple, this arm will be locked. At the end of the downstroke of the driver, the pawl is reversed to throw the dog 27 against the rack 25 by means of a shoulder 24, adjusted in position on the rack 25 by connexion with the staple-guide. The dog 27 prevents the driver from being moved downward during the feeding of a staple. At the end of the upstroke, a fixed shoulder 26 on the rack 25 reverses the pawl to throw the dog 28 into action again.