Patent GB-379682-A (GB)
Title: Improvements in or relating to punching or drilling and rivetting machines
IPC: B21J15/26
Filed: 1931-04-16
Abstract: 379,682. Setting tubular rivets. GOBIN, (dit DAUD•), J., 3, Rue de la BoÙtie, Paris. April 16, 1931, No. 11256. [Class 43.] A combined riveting and punching or drilling machine has a table movable with respect to the stationary work and carrying a feeding. device for the rivets and the punching &c. device either of which may be brought by movement of the table beneath an actuating member such as a hammer. A rivet may comprise two parts B, C, Figs. 2 and 3, secured in a work-piece A, the end of the part B being expanded into the cap of the part C. The machine is also suitable for similar rivets in which the element B carries a cap, or singlepiece rivets similar to the element C but having both ends open, or two-piece rivets with both ends open, or rivets in which the lower element is in the form of a hooked eyelet. A hammer 10, beneath which a punching device and the end of a feed device for the upper rivet elements are moved in turn by movement of a table 6, is reciprocated by oscillation of a shaft 12 about a pivot 13 either manually by operation of a lever 17 or mechanically from an eccentric 115 through a shaft 195, nut 197, and slide member 194 during the punching operation, or from an eccentric 43 through a link 39 and jointed lever 38 during the riveting operation. The eccentrics are loosely mounted on a main drive shaft 116, and a shaft 44 geared thereto, respectively, and are coupled thereto by onerevolution clutclies. A clutch-actuating device comprises a rod 183 normally upwardly spring- pressed to engage a recess of a cam 181 to force it to the right and hold a plunger 178 out of engagement with a recess 188 in the member 175. On depressing rod 183, the eccentric 43 is clutched to the shaft, the rod being immediately released to permit it to follow the outer surface of cam 181 until after one revolution it rides into the disengaging recess to move the plunger 178 to the right. A rod 201 actuates a similar device for the eccentric 115. During continuous automatic operation, a revolution of eccentric 115 is followed by a revolution of eccentric 43 which in turn produces a revolution of eccentric 115. Actuating- rod 201 is operated by a pedal through a rod 208, Fig. 11, resiliently-held plunger 216, and a head 205, the latter being overridden by the plunger as the pedal is further depressed to allow release of the rod 201 to actuate the one-revolution device. If the pedal is not depressed sufficiently quickly, the rod 201 is positively raised by a cam 233, Fig. 1, actuating a bracket 232. At the desired point a cam 219 actuates a two-armed lever 223, 228, the latter normally upwardly spring-pressed, to actuate rod 183, lever 223 being pivoted about its axis 224 when such actuation is not desired, as when the machine is used for punching only. A stop 298 rotatable with the shaft 44 in turn rocks a lever 295 to depress the rod 201, this engagement being released by a rod causing lever 295 to slide along its shaft. The hammer is withdrawn by a spring 56 or by positive safety devices comprising a pin 237 moved by a cam and roller 243, 242 to engage the link 39 for the eccentric 115 and a projection 248 on the link 39 which moves over a projection 249 on the lever 12 when the latter is in a position in which surface 12a rests on the end of link 39, respectively. The feeding device for the rivet elements B comprises a receptacle 103 discontinuously rotated by movement of the table 6 through links 108, 106 and a ratchet mechanism, and having apertures on the wall through which the parts pass to a groove leading to the jaws 21, Figs. 1, 2, and 3. The elements C are similarly fed to a conveyer chain 139 having hollow pivots to carry the elements and being given a longitudinal reciprocatory movement with its support while it is simultaneously rotated by a pawl-andratchet device to feed a rivet element to a hole 134 and tube 125. Modified forms of this lower feed mechanism are described. A rod 111 having a curved end to meet a projecting element 113 on an eccentric strap 114 operates distributers 109, 167 which release the rivet elements and may be rendered inoperative by stops 250, 251 which, when riveting takes place, are released by a roller and incline 252, 254. During the revolution of eccentric 115, punch 9, Fig. la, slidable in a cylinder 61, and anvil 8 are beneath the hammer 10, and a hole is formed in the work, a plate 62 carrying the guiding cylinder being at the same time lowered by a lug and fork 70, 69 and positively withdrawing the punch on the upstroke if the resistance of a spring 65 is insufficient. Revolution of eccentric 43 operates the hammer for the riveting operation, raises a die 24 on a holder 23 through a link 27, and before riveting takes place moves the table 6 and bracket 20 to the right, a rod 34 being slidable through a limited distance within the slide 33 and integral with a block 35 carrying a driving bolt 50 which is raised from engagement by a cam and rollers towards the end of the movement to allow the table 6 to be held bv a spring 60 against a stop 59. During upward movement of the die-holder 23 a plate 133 is swung to the left and a tube 125 passes into the position that was occupied by it. The hammer carries an end 85 of reduced diameter which enters the element B of the rivet while the main portion of the hammer forces the element against the jaws 21, Fig. 4, carried on leaf springs 101, first to extend a spring 97 while lowering a bracket 94, 95, and then to force the element through the jaws to effect the riveting operation when a stop 92 abuts against a member 87. The lower die may carry a needle when open-ended rivets are being set. The punching and riveting devices may be duplicated to secure a number of parallel rows of rivets. The work is displaced between successive operations through a distance equal to the pitch of the rivets, by a point 275 which is caused to enter a hole previously punched or a rivet previously set by a cam 259 through a lever 257 and a blade 261. The point is caused to move in an arc by a cam and follower 267, 269 during movement of the table 6, rectilinear movement of the work and its direction beir.g controlled by a ball 277, Fig. 4, on a link 278 pivoted at 279 to a support which may be angularly adjusted about a stud 281. Presser feet 71 normally resiliently held by springs 78, 79 in engagement with the work, are raised during the feed movement by a link pivoted at 284, Fig. 15, and lever 80, Fig. 1. Tongs &c,. to grip the head of a capped rivet may replace the point 275. The machine is adapted for drilling instead of punching by the use of a hollow hammer 10 through which the rotatable drilling shaft passes, the machine in this case performing one automatic cycle after the drilling operation has been manually effected.