Patent GB-190325680-A (GB)
Title: Improvements in Wiring Machines.
Inventor: WHEATLEY WILLIAM HUMPHREY
Filed: 1903-11-24
Granted: 1904-11-24
Abstract: 25,680. Wheatley, W. H., [Hull Key Can Co.]. Nov. 24. Metal, sheet, wiring edges of; making cans and canisters; stamping.-Relates to wiring-machines generally and particularly to a machine for introducing a wire inside the cover of a packing vessel or can to facilitate the opening the same by means of a key. The blanks are struck up in a separate press to the form shown in Fig 9, or a die may be attached to the wiring-machine to act upon a flat blank. Dies 2, 3, 4, 5, Fig. 7, in a line at the front of the machine, and punches 7, 8, 9, 10, act in turn upon the blanks ; the punches are operated by means of eccentrics 18, 19, Fig. 2, and suitable levers from a cam shaft. The main shaft 11 is driven by belt gearing, and transmits motion by means of spur gearing to cam shafts in the machine. The feeding- mechanism consists of a continuously - rotating dial 24 driven by a belt from a pulley on the shaft 16, and a stationary table 34, sidewall 35, and guide 36 which narrow down the space along which the blanks are fed, so that only one blank passes to the dies at a time. A conveyer 26 carries the blanks from one die to the next, and consists of two parallel rocking shafts which carry two series of opposed gripping-portions 39,40 pivoted to sleeves which are keyed to shafts so as to rotate therewith, but are capable of longitudinal movement thereon. The longitudinal motion of the sleeves is derived from the cam 44 by means of the lever 45 and a connection comprising a cross-piece engaging grooves, one on each sleeve. A spring returns the sleeves. The rocking motion is imparted to the shafts from a cam on the shaft 16 by means of cranks, links, and levers, so arranged that both shafts rock simultaneously. Springs assist in opening and keeping closed the grippers, and the operations are timed so as to close the grippers upon a blank, then to move longitudinally to the next die, open, and return for the next blank. Stops 58, 59, normally held down and lifted when required by means of cams on the dial and grippers respectively, prevent irregular feeding of the blanks to the conveyer. The dies are provided with knock-out pads 65, 66, 67, 68, which remove the blanks from the conveyer, support them until the punch moves them into the dies, and raise them again into position to be re-gripped by the conveyer. Each pad is normally held above the die by the spring 69, Fig. 3, controlling an arm 70 mounted loosely on the shaft 71 and carrying bifurcated arms 72, each of which engages pins 73 on the stems of the respective pads 65 &c. To depress the pads, a pin 78 in each bifurcated arm is moved downwards by a projection 79 fast on the shaft 71 ; this shaft is operated from the cam 80 by means of the levers 83, 85, and link 84. The second and third dies are provided with rubber springs 86 which assist in lifting the pads out of the dies. The die 2, Fig. 7, has an outer stationary ring 89 with an annular ledge 90, and an inner ring 91 with an annular flange 92, the inner ring being split into four parts and adapted to be expanded by the member 93 operated by means of cranks, links, and levers from the cam 97. The pad 65 serves, in conjunction with the ring 91, to pinch the blank against the wall of the ring 89 so that the lower edge of the rim is coiled over at the point 103 to the form shown in Fig. 10 by the flange 92 projecting over the ledge 90. The die 3 consists of an outer ring 105 and an inner movable ring 106 provided with a projection 107 to extend through an aperture 108 in the pad 66. Rocking shafts 109, 110 carry, respectively, a projection 114 engaging the ring 106, and cutters 115 to cut the openings 215, Fig. 11, in the rim of the blank. The shafts 109, 110 are connected by links so as to rotate simultaneously. A spring normally holds the rocking shafts in the positions shown in Fig. 7, and a plunger 117 carried by the punch 8 operates the shafts so that the ring 106 moves towards the cutters, and pinches the blank between the projection 107 and the outer ring, while the cutters cut the slots. The die 4, Figs. 3 and 7, has an outer vertically-movable ring 116 having an inside peripheral incision 117 and a ledge 118 held normally in position by pins 119 and springs 120. The member 121 upon which the pins rest is operated from the cam 125 by means of the roll 126, arm 127, rod 128, lever 129, and an arm 123 engaging pins 124. An intermediate stationary ring has a circumferential depression, and an inner expansible split ring 132 having an annular flange 133 and a circumferential groove 134, Figs. 8 and 17 ; the split ring is expanded by the member 135 which is operated from the shaft 96. A plate 138, adjacent to the die 4, travels in a curved slot 139 and is operated from the arm 142, Fig. 2, and carries fingers 147,148 and a cutter 149 for severing the wire, which is fed through guides 151 and the cutter 149, over a groove in the finger 147, and through the opening 152 in the die. The wirefeeding mechanism, shown separately in Fig. 20, comprises two rollers 163, 164 driven in one direction intermittently from the cam shaft 16 by means of an eccentric, rack and pinion, and toothed and ratchet gearing. The lower roll is mounted in stationary bearings, and the upper roll is mounted on a toggle-joint 173 controlled from the arm 175 which is normally pressed outwards by a spring. The slider 177 is controlled by links 178, 179 on a shaft 180 operated from the cam 181, Fig. 2, and carries a pivoted dog 185 normally engaging the projection 186. A forward movement of the slider straightens the toggle-joint and lowers the upper roller to feed the wire. A retractor dog 188, carried by the slider 177 and acted upon by the spring 189, normally grips the wire between itself and the steel piece 190 to pull back a certain amount of wire on the return stroke of the slider. The shaft 191 carries a safety dog 192 which, when rocked backwards, engages the pin 193 of the dog 185 and moves it out of engagement with the projection 186, so that the upper roll is prevented from descending when the slider moves forward, and thus no wire is fed. The dog 185, as it is disengaged, moves the retractor dog 188 out of operation by means of a spring and pivoted levers, so that no wire is pulled back. The shaft 191 is controlled by the safety stopping-arrangement 200, Fig. 2, comprising a pivoted lever 201 adjacent to the die 3 and provided with a member 202 which projects into the die if no blank is in it. The lever 201 is connected with the shaft 191 by means of a rod and crank ; the shaft 191 carries a second crank 205 connected with the rod 206 provided with a loose sleeve 208 and a spring 209 adapted to slide on the rod by means of an arm 210 having a roll engaging the cam 212. The cam, as it rotates, slides the sleeve upon the rod and rocks the shaft 191, but, if a blank is in the die 3, the spring 209 is merely compressed and the shaft is not rocked. The die 5, Fig. 7, has a stationary inner ring 154 and outer ring 155, and has pivoted adjacent to it on the arm 156 a movable portion 157 carrying a piece 158 which bends the excess of wire up against the blank, and extends into a cut-out portion of the die and has an arc-shaped surface. The part 157 is operated from the cam 160 through the arm 159. In operation, the blanks are fed upon the dial 24 and the stops 58, 59 are lifted in turn to allow them to pass singly to the conveyer 26, the arms of which close upon the blank and place it upon the die 2. The arms open and move backwards to receive the next blank while the punch 7 descends and the lower edge of the rim is rounded. The pad 65 then raises the blank from the die, to be gripped by the second pair of jaws and carried to the die 3 in which the slots are cut in the rim, and a new blank is carried to the die 2. In the die 3, the impression 216, Fig. 13, which is intended to receive the opening key when the can is wrapped up, is made in the blank. Before the blank reaches the die 4, the outer ring 116 is moved up to bring into operation the inside surface 117 against which an excess of wire is fed. The split ring 132 expands, the flange 133, Fig. 8, projects over the depression 131, and a slight movement of the plate 138 causes the wire to be pinched by the finger 147 in the groove 134 and depression 131, and the other end is moved outwards by the finger 148. The pull-back device tightens the wire against the inner split ring, and the wire is cut off and the free end bent outwards. The blank now comes into position on the die 4, the free end projects through one of the openings, and the plunger 9 in descending forces the cover down in the die and causes the lower edge of the rim to enter the depression 131 of the ring 130, which is then closed to curl the rim over the wire as shown in Figs. 12 and 13. The blank then moves on to the die 5, in which the projecting end of wire is bent as shown in Fig. 14. Blanks or covers of any shape may be acted upon. The outer member of the wiring-die may be stationary and provided with a groove against which the wire is fed. The cutting mechanism and the inner movable member of die 3 may be operated by cams and slides.