Patent GB-190629224-A (GB)
Title: Improvements in Nailing Machines
Inventor: CUMMINGS HENRY HAVELOCK
Filed: 1906-12-22
Granted: 1907-12-19
Abstract: 29,224. Cummings, H. H. Dec. 23, 1905, [date applied for under Patents Act, 1901]. Nailing.-Relates to that type of nailing- machine known as "loose nailers," and more particularly to an arrangement for spacing the nails by adjustment of the awl with respect to the driver, of the kind wherein the awl is held in position at the lower end of the awl-carrying bar and may be moved laterally therein. The invention also comprises means for adjusting the swing of the awl-carrying oscillatory head, to correspond to the various adjustments of the awl. A column A supports the usual frame A<1>, Figs. 2 and 10, with a driving-shaft C, rocking-head B, driver bar 3, driver 3<a>, and awl bar 5. Situated at the front end of the shaft C is a cam adapted to lift the driver bar against the action of an adjustable spring 9, preparatory to delivering a blow. At the rear end of the driving shaft is a friction clutch, Figs. 4 and 10, consisting of a friction disk 14 and loose pulley 15, against the bars of which a suitably-shaped collar 16 may be pressed by the upward movement of a forked wedge 18. Adjacent to this fork is a brake wheel 22 integral with cams 23, 24 and embraced by a band brake 25. which terminates in wedge-shaped blocks 28, 29. These blocks are situated between rollers 30 mounted on the forked wedge, so that depression of the treadle rod 19 has the effect both of releasing the friction clutch and applying the brake. To permit of one nail only being driven, the cam 24 is so shaped that depression of the treadle rod to stop the machine may take place, under the action of the spring 159, at the completion of every nail-driving operation. By maintaining the treadle 161 de. pressed, a number of nails may be driven. The cam 23 works a horn-actuating rod 39 through an intermediate bell-crank lever mounted in bearings 37. Another cam, nearer the front of the machine, operates the bell-crank levers E, F, the former of which is connected by an adjustable stud 48 and sliding blocks 52, Fig. 6, with the rocking-head B, whilst the latter operates segmental gear 59 engaging a rack 60 on the awl bar 5, Fig. 2. The awl is held in one of a number of holes 64 in a T- shaped awl-carrier 62, Fig. 5<a>, which may be slid into the lower end of the awl bar and there secured by a screw 66. The awl is clamped in position by means of a set-screw 65. A corresponding awl-guide 67, removably secured to the nail-receiving block 68, oscillates with the head B, while immediately beneath the block 68 is the usual feeding-plate 69 and edge-gauge 71 carrying a roller 72. The nail-receiving block is grooved to receive tongues 74, 75 formed on the lower end of a raceway 101, Fig. 2 ; a separator lever 76, actuated by a face-cam 81, transfers the nails one by one into a channel in the nail-receiving block. A lever, mounted on the separator shaft F, is provided with a sleeve carrying a hopper and forming a bearing for a drum shaft which carries the usual shelves or lifters. One end of the raceway 101, which is constructed of a pair of plates secured together by spacing-blocks, is situated inside the hopper, while the lower end of the raceway is firmly secured to the rocking-head B, thus preventing lateral displacement between the nail-receiving block and the raceway ; the latter is connected by the usual tongue and groove. The horn-actuating rod 39 is joined to the treadle 120, which is pivoted to the lower end of the horn shaft 122. The horn shaft is provided with the usual adjustable collar 123 and spiral spring 124, and at its upper extremity is threaded to receive the hub 128 of a hanger arm 129. The lower end of the arm is locked in position by two projections on a collar or sleeve 133, and is shaped to provide a bearing for a short shaft 136 having a nut 137 and spring 139 at its lower end. The upper end is secured to a cam-head 138 bearing on a corresponding camface 142, which may be actuated by a handle 143 carrying a ratchet pin 145 engaging a ratchetwheel 146. A link 148 is pivoted to the head 138, and is also pivoted to the lower end of the horn 149. The horn is pulled down, while the awl is feeding the stock, by a pawl 152 pivoted on a carrier 153 attached to the rod 39. This pawl engages, during its upward movement, a rack 155 attached by a rod 156 to the treadle-lever 160; but during its downward movement, a block 157 knocks off the pawl and allows the spring 124 to elevate the horn against the stock.