US314935A - Screw-pointing machine - Google Patents

Description

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H. A. HARVEY & G. S. CLARK. SGREW POINTING MACHINE.

No. 314,935. Patented Mar. 31, 1885.

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H. A. HARVEY & 0. s. CLARK. SCREW POINTING MACHINE.

No. 314,935. Patented Mar. 31, 1885.

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SCREW POINTING MACHINE. 1

N0. 314,935. Patented Mar. 31, 1885.

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I UNITED STATES PATENT OFFICE.

HAYIVARD A. HARVEY, OF ORANGE, NEW JERSEY, AND CHARLES S. CLARK, OF PROVIDENCE, RHODE ISLAND; SAID CLARK ASSIGNOR TO THE HARVEY SCREIV AND BOLT COMPANY, OF CONNECTICUT.

SCREW-POINTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 314,935, dated March 31, 1885.

Application filed March 12, 1834. (No model.)

T aZZ whom it may concern.-

Be it known that we, HAYWARD A. HAR- vEY, of Orange, New Jersey, and CHARLES S. CLARK, of Providence, Rhode Island, have invented certain Improvements in Multiple Screw-Pointing Machines, of which the following is a specification.

Our improvements relate to a type of screwmachines for operating simultaneously upon to a number of blankswhich are so supported in equidistant transverse notches or grooves formed in the periphery of a rotating carrying-wheel that the longitudinal axes of the blanks are parallel with the axis of rotation I 5 of the carrying-wheel, and in which a stationary guard which partially surrounds the carrying-wheel holds the blanks in the grooves during that part of their orbital revolution in the course of which they are being operated upon.

Our invention consists in the adaptation of a machine of this character to the purpose of pointing screw-blanks by the provision of a series of devices for rotating the blanks upon their longitudinal axes,which devices partake of the rotatory movemement of the carryingwheel, and by providing cutting-tools which are suitably supported upon and rotate with the carrying-wheel, and against the cutting- 0 edges of which the tail ends of the blanks, re-

- spectively, are pressed while they are being rotated upon their longitudinal axes, whereby during that part of the orbital revolution of the blanks in the course of which they are 5 being operated upon their tail ends are cut into cone-shaped points.

For the purpose of imparting rotation to the blanks upon their longitudinal axes, ordinary rotating spindles provided with jaws, and

having the capacity of endwise movement,

may be employed, or we may employ, as shown in the drawings, a series of rotating screwdrivers arranged in longitudinal alignment with the grooves and having an endwise re- 'ciprocating feeding movement. In either case the screw-drivers or other devices for rotating the blanks upon their longitudinal axes are by means of a suitable cam successively held away from the face of thecarrying-wheel, while the blanks which have been pointed are being discharged and new blanks are being fed into the grooves respectively. The devices for rotating the blanks are then released by the can1,and are forced by their own gravity,

or by a spring, as the case may be, into en- 5 gagement with the heads of the blanks which have been fed into the grooves with the requisite pressure to feed the tail ends of the blanks against the cutting-tools. By this mode of performing the cutting operation, by means of a cutting-tool rigidly affixed to the holder in which the screw-blank is carried, and in which the blank is fed endwise against the cutting-tool, we are enabled to out upon the tail end of the blank a very perfect and accurately-pointed cone.

The accompanying drawings represent a machine embodying our improvements, in which the carrying -wheel rotates upon a vertical axis. The carrying-wheel may, however, be arranged to rotate upon a horizontal axis, in which case the mechanism for feeding the blanks to the machine will require to be changed by the substitution of either of several well-known forms of feeding devices in the place of the one shown in the drawings, which is also well known, and which in itself does not form any part of ourinventionl The drawings are as follows: Figure 1 is a side elevation. Fig. 2 is a top view of a part of the machine, showing the rotating system of screw-drivers and the disk in which they have their upper bearings, and the stationary cam for giving them their endwise movement. Fig. 3 is a central vertical section of the car- 8 5 rying-wheel, the external guard, the two disks in which the screw-driver spindles have their bearings, the cam for elevating the screwdriver spindles, and a portion of the frame in which the shaft of the carrying-wheel has its 0 upper bearing. Fig. 4is a detached top view of the cam for elevating the screw-driver spindles. Fig. 5 is a top view of the carrying-wheel and the stationary guard whichpartially surrounds it, showing the check for delivering the 5 blanks to the grooves in the carrying-wheel, and a portion ofthe ways for guiding the blanks from the hopper, also showing the chute and the stripper for discharging the pointed blanks from the grooves into the chute. Fig. 6 is a x00 vertical section of a portion of the carrying-- wheel and the stationary guard, showing the pointing-tool affixed to the under side of the carrying-wheel and ablank engaged by one of the rotating screwdrivers in the position which it occupies when the pointing operation has been completed. Fig. 7 is an elevation of one of the grooved portions of the periphery of the carrying-Wheel. Fig. 8 is a top view of the parts shown in Fig. 7. Fig. 9 is a vertical section of a portion of the carrying-wheel, showing a cutting-tool and a blank engaged by one of the rotating screwdrivers in the position which it occupies at the commencement of the pointing operation.

The machine is erected upon a suitable frame, A. The driving-shaft B is horizontal and is driven by a belt upon the pulley B. A bevel-pinion, 1), upon the inner end of the driving-shaft engages a bevel-wheel, b, affixed to the vertical shaft 0 of the carrying-wheel D. A bevel pinion, 5", on the driving-shaft B engages a bevel-wheel, b affixed to a counter-shaft, E, provided with a crank, e, which is connected by means of the pitman 6 with the oscillating lifter e", for elevating the screwblanks by their heads from the hopper F and discharging them into the inclined ways 1, down which they slide, hanging by theirheads, and from the lower end of which they are successively fed to the carrying-wheel by means of the usual checking mechanism, G, operated by the levers g g, which are acted upon by the cam-wheels g and g, affixed to the carryingwheel shaft 0.

The periphery of the carrying-wheel D is provided with transverse grooves d, for con taining the shanks of the blanks successively fed to the carrying-wheel by the checking mechanism G. The blanks are held in their grooves (1 during a suitable portion of their orbital revolution by means of the shield or guard H, which partially surrounds the periphery of the carrying-wheel. The guard H is a segment, preferably of hardened steel, seated in a groove formed in theconcave face of a cast-iron segment, H, which is adjustably secured to the horizontal member a of the frame of the machine by means of the vertical bolts h, inserted through the iron segment, and through suitably slotted or enlarged holes in the horizontal member a of the frame. The adjustment of the guard is effected by the setscrews h, inserted through holes tapped in radial directions through the horizontal member a of the frame, and bearing upon the convex side of the cast-iron segment.

'Fastened to the under side of the carryingwheel' in proper proximity to each of the grooves d is a cutting-tool, 1. Each of the tools I is seated in a groove, 1', formed in the under side of the carrying-wheel, extending from the periphery toward the center of the wheel, 'and is held therein. by means of the clamp I and the bolts 1 I. The Width of the groove z'is slightly greater than the width of .the tool, an'd the cutting-edge 13 of. the tool is held in proper position by means of the adjusting-screw 11 (Shown in dotted lines in Figs. 7 and 8.)

The rotation of the blanks upon their 1ongitudinal axes is effected by means of the rotating screw-drivers J, affixed to the lower ends of the vertical spindles K, having their hearings in the parallel disks L and M, affixed to the carrying-wheel shaft 0. The spindles partake of the rotatory movement of the carrying-wheel, and are hence revolved bodily around a common center.

The rotation of the screw-driver spindles K upon their axes is effected by means of the belt K, which bears upon the pulleys k,affixed to ,the screw-driver spindles, during the required portion of the orbital movement of the spindles, and is driven by the pulley K",affixed to the vertical shaft K*, which is rotated by the engagement of the bevel-pinion K* upon its lower end with the bevel-wheel K affixed to the main shaft B of the machine. A downward pressure is exerted upon the spindles K v by means of the expanding spiral springs j, the upper ends of which abut against the un der side of the disk M,while their lower ends abut against the hubs of the pulleys 7c, respectively.

The elevation of the screw-drivers after the conclusion of the pointing operation is effected by means of the stationary cam J, which is fastened to the hollow boss a, in which the carrying-wheel shaft Chas its upper bearing.

The upper end of each screw-driver spindle K is provided with a collar, j, which is fastened to the upper end of the spindle by means of the set-screw f The under side of the collar j bears upon the upper side of the loose collar J. The lower side of the loose collar J 2 bears upon the face of the stationary cam J.

The spindles K are made to rotate upon their longitudinal axes during a sufficient part of their orbital revolution to enable the pointing of the blanks to be completed. By the continued rotation of the carrying-wheel after the pointing of each blank is completed, the pulley it upon its screw-driver spindle is withdrawn from contact with the belt K and the spindle ceases to rotate upon its own axis. Its collar J 2 then engages the rise 1 on the cam J, and as the collar rides up the rise 1 its spindle K is elevated into the position in which the left-hand spindle is represented in Fig. 3 of the drawings. This withdraws the screwdriver from contact with the head of the blank, and, as the carrying-wheel continues to revolve, theshank of the pointed blank is brought into collision with the edge of the stationary stripper N, and is thereby forced out of its groove in the carrying-wheel and dropped into the chute N, by means of which it is discharged in a prescribed direction. The screw-driver spindle remains elevated until after the pointed blank has been dis .charged from its groove and a new blank has been fed into the groove, after which its collar J rides off the edge 2 of. the elevated part IIO of the stationary cam J, spiral spring j then presses the spindle downward until the screw driver J is carried against the head of the blank which has been fed into the groove. In the meantime the pulley k is engaged by the driving-belt K, the spindle is rotated, and the screw-driver is thus made to find the nick in the head of the blank and to rotate the blank upon its longitudinal axis and at the same time press the tail of the blank against the cutting-tool.

It will be understood that the expanding spiral spring j may be made stiffer when the carrying-wheel is arranged to rotate upon a horizontal axis, and that when the machine is arranged as shown in the drawings, so that the screw-driver spindles are vertical, the spring j may be made very light, or may be in some cases entirely dispensed with when the weight of the spindles is sufficient to cause them, when released by the cam, to press the blanks against the cutting-tools with the required force.

It will also be understood that, for the purposes of ourinvention, revolving spindles with jaws for seizing the heads of the blanks are the perfect equivalents of the screw-driver spindles, and that the cam for elevating-the screwdriver spindles and holding them up during the successive discharges of the pointed blanks from their grooves and the feeding of fresh blanks in their places will also operate in the same way to elevate a spindle provided with jaws; and, finally, that the revolving spindle provided with jaws may also be allowed to fall by its own gravity or be forced down by a spring, in order to engage the head of the blank which has been fed into the groove beneath it; a

We claim as our invention-- 1. In a multiple screw-pointing machine, a rotating carrying-wheel for carrying in a curved path a series of screw-blanks successively delivered to the carrying-wheel by suitable feeding mechanism, and a series of pointingtools supported upon and revolving with the said carrying-wheel, and a corresponding series of devices, also supported upon and partaking of the motion of the carrying-wheel,for rotating the blanks upon their longitudinal axes, and at the same time pressing the tails of the blanks against the cutting-tools during and the expanding that part of the orbital motion of the blanks in the course of which they are undergoing the pointing operation preparatory to'lbeing discharged from the carrying-wheel.

2. A carrying-wheel having in its periphery a series of equidistant transverse grooves, a concentric shield or guard partially surrounding the carrying-wheel, means for feeding the screw-blanks successively into the said transverse grooves, and a seriesof pointing-tools partaking of the rotatory movement of the carrying-wheel and arranged with their cuttingedges, respectively, opposite the ends of the grooves upon one side of the carrying-wheel, in combination with a series of screw-drivers affixed to spindles, also partaking of the rotatory motion of the carrying-wheel and arranged upon the opposite side of the carryingwheel in longitudinal alignment with the said transverse grooves, means for rotating the screw-driver spindles upon their longitudinal axes, and a cam for disengaging the screw drivers from the blanks successively as the pointing operations are completed and, after each blank has been discharged and a fresh blank fed to thecarrying-wheel in its place,

releasing the screw-drivers to the action of' gravity or to the action of springs, whereby the screw-drivers are permitted to engage the heads of the blanks and to rotate the blanks, and at the same time press them with an endwise movement against the cutting-tools.

3. The rotating carrying-wheel D, adapted to receive a series of screw-blanks and carry them in a circular path, and provided with the cutting-tools I, affixed thereto, the system of screw-drivers J, affixed to the spindles K, partaking of the rotatory motion of the carrying-wheel shaft, and each provided with a pulley, 7c, in combination with the driving-belt K, for engaging the pulleys 7c and rotating the spindles upon their longitudinal axes during a portion of their orbital movement, and the stationary cam J, for varying the distance of the screwdrivers from the carrying-wheel, as and for the purpose set forth.

H. A. HARVEY. CHARLES S. CLARK.

Witnesses:

W. H. THURSTON, E. P. ALLEN.

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