Patent GB-190909694-A (GB)
Title: Improvements in or relating to Machines for Inserting Fasteners or the like.
Inventor: BOULT ALFRED JULIUS
IPC: A43D69/02
Filed: 1909-04-23
Granted: 1910-05-23
Abstract: 9694. Boult, A. J., [United Shoe Machinery Co.]. April 23. Loose - nailing. - In a loose - nailing or like machine in which the depth of penetration of the awl is controlled automatically by the thickness of the work operated upon, the awl is positively actuated and is maintained under constant control during its operative movements. The awl 66, Fig. 2, is clamped in an awl-bar 96, which has a vertical portion adapted to slide in a frame 98, the frame 98 being provided with an horizontal portion 100 arranged to slide in a slideway 102. The portion 100 is reciprocated by a lever 104, operated by a cam 118 on a shaft 20 and provided with a fulcrum block 108, which slides in guides formed in the lever and is pivoted on a pin 110, which may be adjusted on the machine head to vary the horizontal feed movement of the awl. The awl is reciprocated vertically by a lever 125, Fig. 4, carrying on one of its arms a segment rack gearing with a rack on the awl-bar 96. The other arm 126 of the lever comprises a casing in which are mounted two slide bars 1280, 1281. The lower bar 1280 is provided with teeth meshing with the teeth of a pinion 132 on a shaft 124, passing through the sleeve which forms the central part of the lever 125. The upper slidebar receives, through an opening in the casing 126, a pivot 134 upon a block 136, which can be moved vertically in a lever 138, pivoted at one end to the machine head, and at its other end carrying a cam-roll 142 engaging a cam on the shaft 20. The block is held yieldingly in its lowest position by a spring. A lever 152, carrying at one end a segment rack 156 engaging a pinion at the end of the shaft 124, is connected at its other end by a rod 160, Fig. 1, to a slide 162. The position of the slide 162 is controlled by the thickness, and thus the position of the pivot 134 is controlled, through the slides 1280, 1281, the pinion shaft 124, and the lever 152, by the thickness of the work. The movement of the slide 162 due to an alteration in the thickness of the work is timed to occur when the casing 126 and the slide 138 are parallel, so that no movement of the awl is occasioned. When the casing 126 is inclined, the slide 1281 jams, thus holding the pivot 134 in its adjusted position. The slide 162 is normally pressed into its lowest position by a spring 164, which bears at its upper end against a cross-piece in the column 4 supporting the machine head. The pressure of the spring is transmitted to the lever through toggle-links 168, 170 and a lever 172. The toggle is straightened by a rocking lever 178 operated by a cam. When the toggle is broken, the spring 164 is locked against action upon the horn bv pawls on the slide 162 engaging teeth on its bed. The pawls are released, when the toggle is straightened, by engaging projections on the link 168. The horn is depressed, for inserting work, by a treadle 12. When the thickness of work exceeds a predetermined amount, the awldepth controlling-means ceases to cause variations in the movement of the awl, the lever 152 coming in contact with a stop 199. Free movement of the horn, after the lever has reached this position, is allowed for by providing a yielding connexion between the rod 160 and the slide 162. The machine is preferably used in conjunction with nail feeding and delivering mechanism, as described in Specifications 4471/03, 8403/10, and 8555/10. A short portion of one side of each nail race at its lower end can be moved outwards, to permit nails to fall out when it is desired to empty the race. An edge-gauge, which is adjusted to take up a position directly behind the awl, is shown in Fig. 7. The gauge member 402 is formed on a slide 404, which can be moved transversely to the work by a pinion 414. This slide moves on a plate 410 secured to the work abutment 266 by bolts 406. A pinion shaft 417, carried by the slide 404 engaging a rack on the abutment 266, provides means for moving the gauge parallel with the work. The main clutch of the machine, shown in Fig. 12, comprises a loose pulley 18, which is mounted on an adjustable bush 334. A double cone member 348, which is slotted to receive a spider 350 attached to the shaft 20, is normally pressed into engagement with the pulley by a spring 352. It is released and brought into engagement with a hollow cone facing on the frame when a cam-roll 374 comes to a rise on a face cam 376, thus pushing over the cam lever 370, and forcing an adjustable stop 368 on the lever against a stop 367 on a link which operates a lever 362 to press the double cone member outwards against the pressure of the spring 352. The stops 367, 368 are thrown clear by depressing the starting- treadle, thus raising the rod 260, and pulling down the link 366. An adjustable stop 384, in the form of an eccentric, regulates the distance the treadle has to be depressed to throw in the clutch. The cone member may, when desired, be held in a position in which it engages neither of the hollow faces.