US948879A - Nail-making machine. - Google Patents

Description

W. H. HART e LE. DoBsoN.

NAIL MAKINGl MACHINE. APPLIGATION FILEDJAN.14.1908.

Patented Feb. 8, 1910.

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W. H. HART L J. E. DOBSON. NAIL MAKING MAGHINE APPLICATION FILED JAN.14, 1908.

Patented Feb; 8, 1910.

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APPLICATION FILED JAN.14, 1908.

948,879?, Petented Feb. 8,1910.

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w om V) W. H. HART; J. E. DOBSON. NAIL MAKING MACHINE..

APPLICATION FILED M1114, 190s.

Patented Feb. 8, 1910.

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W. H. HART & J. E. DOBSON.

NAIL MAKING MACHINE.

APPLICATION FILED IAN.14, 1908.

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Patented Feb. 8, 1910.

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NAIL MAKING MACHINE.,

APPLICATION FILED JAN. 14, 1908.

948,879. Patented Feb.8, 1910.

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Ilm l umm WILLIAM I-I'. HART, 0F BATTLE CREEK, AND JOHN E. IDOBSON, OF DETROIT, MICHIGAN, ASSIGNORS TO H. B. SHERMAN MANUFACTURING- COMPANY, OF BATTLE CREEK, MICHIGAN, A CORPORATION OF MICHIGAN.

NAIL-MAKING MACHINE.

Specification of Letters Patent.

Patented Feb. 8, 1910.

To all whom 'it may concern.

Be it known that we, llLLIAM H. HART, of Battle Creek, Calhoun county, Michigan, and JOHN E. DonsoN, of Detroit, lNayne county, Michigan, have invented certain new and useful Improvements in Nail-Making Machines; and we hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is an improvement in nail making machines and is particularly designed for making roofing nails having wire Shanks and large disk-like sheet metal heads.

The machine comprises mechanism for feeding the wire; dies for clamping the wire after a. nail length has been advanced; means for feeding a met-al strap across the line of wire feed and in front of the end of the wire; means for punching a nail head from the strap, and driving it onto the end of the wire, (the wire punching its way through the head) g and also if desired, concave-corr veXing the head, means for s vaging the end of the wire to the head, and means for severing a nail length, with the attached head, from the wire and for pointing the nail. Preferably the wire is fed forward after the head is attached thereto, and the wire then seifered; and the same dies which cut the wire also point the same.

The invention will be clearly understood from the following description of the inachine illustrated in the accompanying drawings, which represent the present preferred practical embodiment of the invention, such machine being adapted to turn out nails having cylindrical concave-convex sheet or strap metal heads and barbed, or roughencd,

and pointed wire shanks.

In said drawings-Figure 1 is a top plan view of the complete machine. Fig. 2 is a side elevation thereof. Fig. 3 is a kcentral longitudinal vertical section thereof, some of the parts being shown in elevation. Fig. et is an enlarged sectional plan view of the die portion of the machine, showing parts in position just prior to the severance of the completed nail. Fig. 5 is a plan view with the blanking dies and the wire clamping dies closed. Fig. 6 is an enlarged detail sectional view of the dies just prior to heading the nail. Fig. 7 is an enlarged horizontal sectional view showing the position of the dies and header rod after the completion of the heading operations. Fig. S is a detail perspective view of the wire clamping dies and the female blanking die separated. Fig. 9 is a. detail transverse section on line 9 9, Fig. 1. Fig. 10 is a side elevation of the strap feeding device removed from the machine. Fig. 11 is a plan view of one of the strap guide plates. Fig. 12 is an enlarged sectional view of the wire feeding device on line 12H12, Fig. 3. Fig. 13 is a horizontal sectional view of the strap feeding device on line 13-13, Fig. 10. Fig. 111 is a detail transverse sectional view showing the drive shaft and its cams. Fig. 15 is a perspective view of one of the completed nails.

The wire fw is fed in by means hereafter described through a wire clamping die composed of opposite similar parts 1, 1, (see F G, 7, 8,) mounted in blocks 1a and 1". Block 1b is fastened in a casting 1X secured to an upstanding bracket F1 on the main frame; and the block 121 is slidably mounted in said casting and capable of movement to and from block 1" so as to open or close the die 1. As shown, block 1d is connected by a link 1 to an oscillating lever l pivoted at l on the main frame and in turn connected by a link 1p to a yoke 1c1 loosely supported on shaft S and carrying rollers 1l' engaging opposite sides of an eccentric cam 1s attached tothe main shaft S (see Figs. 1 and 14). By means of these parts the wire clamping die is opened and closed at the proper time.

The inner ends of the parts 1 of thc ,clamping die 1 are semi-cylindric, as shown at 1t and the extremity of this cylindric portion is preferably convex as shown at 1". Around this cylindric portion 1t of the clamping die is removably mounted an annular female blanking die 2, the opening in which corresponds in form to the contour of the head of the nail, being preferably circular. The blanking die 2 has an annular flange 2 which lits into corresponding recesses in the inner faces of blocks 1d and 1b, and secured thereto by means of plates 2" and 9.@ fastened to the blocks by suitable screws. A sufficient play is left between the blanking die 2 and part 1t of the clamping die to allow the clamping die to be opened and closed, this movement of the clamping dic being very slight.

Arranged opposite and in axial alinement with the dies l and 2 is a male blanking die 3, the end of which is adapted to enter the female blanking die 2, and such end is preferably concaved opposite the convex portion lt of die l, so as to co-act therewith and impart a concavo-convex shape to the nail head, as indicated in Figs. 4, G, 7. Die 3 is provided with an annular flange 3 fitted into a corresponding recess in a threaded boss 3b on a plate 3, which is secured to a cross head 5. The die 3 is detachably attached to plate 3c by means of a cap-nut 3d screwed onto the boss 3b (see Figs. 4, 5, 7 The cross head 5 is provided with side base fianges 5 engaging guides F2 on the frame, and this cross head is reciprocated in the guides by means of pitmen 5e pivotally connected to bolts 5d, which are adjustably connected to ears 5C on the cross head, and the pitmen 5e are also connected with eccentric bands 5f engaging cams 5s on the main shaft S (see Figs. 1l4). In this manner the cross head and dies thereon are moved to and from the dies l and 2 at each revolution of the main shaft. Vithin the die 3 is a header rod 4 Which operates axially of the die 3 and is connected to a bar 4 which is guided in a box 5 on cross head 5, and bar 4a is connected at its rear end to a pitman 4b, which is preferably made extensible, as shown, and is connected to an eccentric box 4 engaging an eccentric 4s on shaft S, so that the header rod is reciprocated in and like the cross head, but has a different time of movement, as hereinafter explained. A spring 3X may be placed upon the die 3 and project beyond the end thereof sufficiently to clear the strap S from the die 3 after each punching operation.

Opposite the line of Wire feed are cutting and pointing dies G, which are removably attached to slides 6a, as shown in Figs. 4, 5, said slides being mounted in boxes F 3 on the main frame and being reeiprocated by suitable means. As shown, each slide is engaged by one arm of a crank lever 6 pivoted at Gd on the main frame, the other arm of said lever being connected by a rod 6e to a yoke Gf loosely embracing the shaft S, said yoke carrying a roller 6g engaging a race cam groove in a cam (is fast on shaft S, as shown. These parts are so timed that at the proper moment the cutting and pointing dies are advanced and sever a nail length of Wire.

rlhe Wire may be fed in any suitable manner. As shown, it is fed between rolls 7 mounted upon shafts 7a journaled in a bracket F4 attached to the main frame. The shafts 7a are provided With intermeshing gears 7b. @ne of the shafts 7 is ex tended at one side, and to it is secured a hand Wheel 7c and a ratchet 7d, which ratchet is engaged by a dog 7e pivoted to one arm of a lever 7i loosely mounted on the shaft adjacent latchet 7d, and the other arm of said lever is connected, as indicated in Figs. 1 2, to a rod 7g Which is in turn connected to a slide 7h loosely resting on shaft S and provided with rollers 7 i, 7i, engaging a cam 7s attached to the shaft S (see Fig. 1 14). The rod 7 may be adjustably connected to arm 7" by means of a stud 7Jy adjustably secured in a slot 7k in lever 7 f by a bolt 71, and by adjusting the pin 7J' in slot 7k the throw of lever 7f can be changed so that any desired length of Wire can be fed through the Wire clamping dies l at the time desired.

rl`he peripheries of rolls 7, 7, are serrated r deeply milled, as shown, so as to firmly bite the Wire and also roughen the edges j thereof, so that the shanks of the completed nails will be roughened or barbed, as shown in Fig. l5.

Strap feed-The strap metal from Which the nail heads are formed may be fed toward the line of Wire feed by any suitable means. iis shown the strap s is led in over a grooved guide Wheel 8m j onrnaled on arms F7 mounted on a casting FG attached to bracket F1. From VWheel 8m the strap passes between feeding' rolls 8 mounted upon shafts 8a jonrnaled in suitable bearings supported in castings FG. These shafts 8a have intermeshing gears 8b and one of the shafts is extended at one side and carries a ratchet 8, Which engages a dog 81 pivoted on the lever 8e hung upon shaft 8, and this lever is connected by a link 8f to an eccentric strap 81' inclosing an eccentric 8s on shaft S. A friction brake 8g may be applied to one of the shafts 8a (see Figs. 1 13) to prevent any non-positive movement of the strap feeding rolls. Preferably the strap is fed down after the blanking dies have separated and before the nail is severed. The straps s after passing rolls 8 may be positioned relatively to the blanking die 3 by means of a slotted guide 8X attached to the cross head 5. The strap may be directed to the rolls 8 by means of a guide plate 8 (see Fig. 3-11) mounted on casting F G and provided with grooved rollers 8o adapted to engage the edge of the straps, as shown in Fig. 1l. A similar guide plate may be attached tol-1 the under side of the brackets FG to keep the st-rap in proper position. Preferably the casting FG carrying the strap feeding devices is pivoted to lugs f on brackets F l as shown, so that the strap feeding devices may be thrown back out of the Way when it is desired to get to the dies l, 2, 3; and to facilitate the adjusting or repairing of the dies.

Operation-The several mechanisms and parts .thereof are so constructed, and the ac tuating cams and eccentrics so timed, that at each complete revolution of the main shaft a nail is made. The several steps in and a disk or nail head H is blanked therefrom by dies 3 and 2 and forced into die t2 and against the end of the wire w clamped in die l, the head H being forced onto the end of the wire, which punches its way through the center of the head. A further inward movement of the die 3 then pinches the head between the convex end lt of die l and the concave end of die 3, which impart a concave-convex shape to the nail head. lVhile the parts are in this position the header rod l, which has been following up die 3, is moved farther forward and impinges upon the end of the wire projecting through the head H and swages the same down upon the head and firmly rivets the wire to the head. Preferably a slight annular recess l is formed in the outer end of the part lt around the wire groove la, so that when the header 4 compresses the wire a ridge 7L is formed on the shank under the head, as well as the nut tl outside of the head (see Figs. 6 7), thus making a very firm and tight joint between the wire and the head. The header rod 4; and the die 3 then move away from die 2, and about simultaneously the wire feed comes into operation and moves the headed end of the wire out toward the retreating die 3 until a length of wire equal to the desired length of a nailshank has been projected through die 2. Thereupon, while the die 3 and the strap s are clear of the headed wire, the pointing and severing dies 6 are actuated so as to cut ott' the headed portion of the wire, which completes the nail; as the dies 5 point the nail. simultaneously with the severance of the wire after the wire is severed, it remains at rest-and held by die l-unt-il another head H has been attached thereto. Meanwhile the strap feed may be operated so as to feed in enough of the strap s to bring a fresh portion thereof between the dies 2 and 3, so that at the next inward movei'nent of the die a new head can bc blanked from the strap and fastened upon the end of the wire in the manner above described. rlhe cutting and pointing dies 6 retreat out of the way as the die 3 advances toward die 2. The above described cycle of operations is performed with each rotation of the main shaft S and all of them occur in proper sequence. By shortening die 3 and elongating the part lt of dies l so as to lill die 2, the machine can be used for forming box strapping.

Having described our invention what we claim as new and desire to secure by Letters Patent is:

l. The combination in a nail making machine, of a wire clamping die, a female blanking die surrounding the end of the clamping die, and a male blanking die movable to and from the female die; means for opening and closing the wire clamping die, and means for operating the male blanking die.

2. The combination of a wire gripping die composed of opposite part-s having reduced portions on their inner ends, a blanking die loosely fitted over the reduced portions of the clamping die, and a male blanking die movable to and from the female blanking die.

3. rlhe combination of a wire gripping die composed of opposite parts having reduced parti-cylindric portions on their inner ends, an annular blanking die loosely fitted over the cylindrie portions of the clamping die, and projecting beyond the same; and a male blanking die movable to and from the female blanking die.

et. In a nail making machine the combination of a wire clamping die, fixed and movable blanking dies, means for feeding a wire through the clamping die, means for feeding a strap between the blanking dies across the line of wire feed, and a strap guide movable with the male blanking die.

5. In a nail making machine the combination of a wire clamping die, fixed and movable blanking dies in axial alinement with the wire clamping die, means for feeding a wire through the clamping die, means for feeding a strap between the blanking dies across the line of wire feed, a strap guide movable with the male blanking die, a header rod, and means for disengaging the perforated strap from the male blanking die.

6. The combination of a female blanking die, a male blanking die, means for feeding a strap between the blanking dies, and a guide for the strap movable with the male blanking die.

7. In a nail making machine, the combination of a wire clamping die, means for feeding a wire through the clamping die, means for feeding a strap across the line of wire feed, a header rod and a strap guide movable with the header rod.

In testimony that we claim the foregoing as our own, we aflix our signatures in presence of two witnesses.

WILLAM H. HART. JOHN E. DOBSON. In presence of- FRANK M. ANDREss, ARTHUR E. DownLL.

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