Patent GB-190619631-A (GB)
Title: Improvements in Nail Forming and Driving Machines.
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1906-09-03
Granted: 1907-08-29
Abstract: 19,631. Justice, P. M., [Manufacturers' Machine Co.]. Sept 3. Making nails; shearing.-In a nail making and inserting machine of the type in which tapered nails are cut from a metal ribbon or strip, which is reversed after each nail is severed, the strip is fed obliquely to the driver and is reversed about its edge as an axis, in order that two nails may be severed each time the strip is advanced. Means are also provided for transferring several nails into position beneath the driver. The driving-pulley 4, Fig. 1, on the main shaft 3 is provided with a number of studs 5 to engage a clutch dog 6, pivoted to an arm mounted on the shaft, and normally pressed by a spring 9 upon a table 10 on a starting-lever 11. When the lever 11 is depressed by means of a treadle, the dog 6 is thrown out radially by the spring 9 and is engaged by one of the studs 5. The shaft 3 makes one or more complete revolutions until the table 10 again rises to throw the dog 6 out of engagement, To ensure the shaft always stopping in the same position, an arm 14 engages the lever 11 in its raised position and is held by a spring latch on the lever. The lever 11 is slightly resilient. The strip S from which the nails are cut is drawn from a reel which may rotate when the strip is reversed, or may be stationary, the flexibility of the strip allowing the front end to be turned. The strip is led through a sleeve 39, pitched slightly from the horizontal, and mounted in bearings in a yoke 40, which is adjusted and clamped by screws 41, 42, Fig. 6. To reverse the strip after each nail is severed, the sleeve 39 is oscillated in its bearings. A block 44, sliding radially in the sleeve 39, is slotted at 45 to receive the head 46 of a pin 47 on an actuating-lever 48, Fig. 1, jointed at its upper end, by means of an eccentric adjustable pin 49, to an arm on the spring shaft 20. Besides being raised in this manner, the lever 49 is reciprocated laterally by means of a slot and sliding block mounted on a pin on a toothed wheel 55, which is driven by a pinion on the shaft 3 having half the number of teeth of the wheel 55. The lever 48 is thus oscillated once for each revolution of the shaft 3, and the sleeve 39 is turned over after each nail is severed. The sleeve 39 is so arranged that the strip turns about one edge as axis Fig. 12 shows the form of nail, and how the reversal of the strip into the position shown in dotted hues advances a fresh blank in relation to the driver 38 without a separate feeding movement. After every second nail has been severed, the strip is fed forward by the mechanism shown in Figs. 1, 6, and 8. A rod 58, sliding in the yoke 40 and normally pressed outwards by an adjustable spring, carries a block 61 to which is pivoted a jaw 64. The strip S is gripped between serrated faces on the block 61 and jaw 64, which is kept in position by a spring pin 65. A slide 66 on a reciprocating head 68 enters a wedge-shaped space between the block 61 and jaw 64, as shown in Fig. 6, and causes the jaw to grip the strip, at the same time feeding it forward. When the slide 66 returns, the rod 58 is pressed back by its spring until it encounters an adjustable stop 78; the slide 66 then retires and leaves the jaw 64 free. The jaw 64 is raised automatically by the turning of the strip. The head 68 is reciprocated by a lever 70 and a cam on a toothed wheel 73 which is driven at half the rate of the shaft 3, so that the feed-motion takes place at every alternate action of the severing and driving mechanism. The strip is held in the sleeve 39 by a detent consisting of a plate 76 controlled by a spring 77. The cutting-mechanism, shown in Figs. 2 and 6, comprises a stationary cutter 81 adjusted by a wedge 82, and a movable cutter 86 adjusted by a wedge 87. The movable cutter is pivoted to its carrier 83 and held by a spring 89, which enables it to return freely over the end of the strip S. The carrier 83 is reciprocated by a lever 92 and a cam 95 on the shaft 3. The severed nail lying on the movable cutter is held by a presser plate 96 acted upon by a spring 97, and is transferred by the motion of the cutter into a position opposite the driver passage, into which it is pushed by the bent end of a spring plate 98. To restore the pusher 98 to permit the return movement of the presser 96, a stud 101 on the pusher has a bevelled inner end and is engaged by the bevelled end of a vertically-sliding pin, actuated by a screw 103 on a lever 104 which is struck by the driver bar 36.