US1394716A - Machine for spirally threading or grooving wire - Google Patents

Description

J. F. CULVER.

SCORING DEVICE.

APPLICATION F1LED1uNE9,192o.

Patented Oct. 25, E921.

INVENTOR.

J. VIES.

MACHINE FOR SPIRALLY ADING 0R GROOVING WIRE, IIIIIIIIIIIIIIII AG.7.1919.

'1,39%7160 Patented Oct.. 25, 1921.

2 SHEETS-SHEET 2.

irED STATES PAET i IA.

MACHINE FOB SPIBALLY THREADING- 0R GROOVING WmE.

Specification of Letters Patent.

Patented Uct. 25, 192i.

Application filed August 7, 1919. Serial.- No. 815,958.

To all whom 'it may concern:

Be it known that I, JOSEPH BAn'rLE'r'r Davies, accountant, subject of the King of Great Britain, residing at 225-231 Queen street, Melbourne, in the State of Victoria, Commonwealth of Australia, have invented certain new and useful Improvements in Machines for Spirally Threading or Grooving Wire, of which the following is a specification.

Thls invention relates to improvements in machines for forming one or more grooves or flat sides or ribs helically around a wire and refers, especially to the formation of spirally threaded or grooved wire for use in the manufacture of nails, and for other pur osea.

itherto it has been the custom to manufacture spirally threaded wire in one of the following ways viz., by twisting wire of angular cross section (such as square) by drawing it through a fixed die of a corresponding shape by means of a winding drum which is itself rotated on the axis passing through the die whereby the wire is twisted to the desired pitch as it leads on to the said drum or by forming a spiral thread around the wire (without twisting the same) by passing the wire between two or more rotating rollers or moving plates having their peripheries or faces as the case may be shaped to form a thread on the wire of a desired pitch, the said rollers either revolving around the wire or being prevented from so revolving.

The disadvantages of the first method are that it involves two separate operations, that is first drawing the wire to the required shape in cross section and secondly twisting the wire so drawn. The twistingoperation strains and weakens the wire and in addition as a length or coil of wire vvis rarely of an uniform degreel of hardness throughout, the softer portions are given a greater twlst than the hard portions with the result that the twist or pitch of the thread is uneven. The disadvantage of the second method is that the mechanism employed is costly to manufacture and maintain and special dies must be employed to shape threads of different lpitch even on wire of the same diameter, whi e inthe cases' where the rollers are prevented from rotating around the wire a rib or ridge is formed longitudinally on the wire.

The object of the present invention is to provide simple and eiiicient means whereby w1re of ordlnary round section may in one operation be provided with a spiral thread or groove of uniform pitch without twisting the same and without forming ridges longitudinally thereon.

The invention moreover comprises means for cleaning or removing any frayed ed es or burs formed on the wire during t e threading or grooving operation.

I accomplish the above mentioned object by providlng means whereby av len h or coil of wire is drawn from a bob in or swift through a rotatable die onto a winding drum or drawing block in such a way that the wire will be drawn to the shape of the die and the rotation of the die will form one or more grooves or flat sides or ribs helically on the wire according to the shape of the said die and without twisting the said wire. A"cleaning appliance is located between the die and the drawing block to remove any frayed edges or burs formed on the wire by the action of the die.

The die can be made to shape the wire to any approved section other than. circular and the pitch of the grooves or flat or other shaped sides formed thereby is determined by the relative speed at which the die is rotated and the speed at which the wire is drawn therethrough. Means are provided for gripping the wire and guiding the same while feeding to the die and vthe gripping face of the die is made narrow to insure it forming a correct s iral on the wire without twisting the same etween the said die and .the drawing block.

In order that the invention may be readily understood reference will now be had to the accompanying sheets of explanatory drawings, wherein Figure 1 is a view in elevation of an apparatus embodying the improvements comprised in the resent invention, parts of the apparatus beln shown broken away for convenience of illustrating purposes.

Fig. 2 is a view in sectional elevation of a die forming an essential feature of the appao Lil n ratus and shows a piece of wire as in the act of passing therethrough and with one end provided with helically formed ribs.

Fig. 3 is a view in sectlonal elevatlon of the die and the means for revolubly supporting the same.

' Fig. 4 is a view in end elevation of a die adapted to impart a triangular section to a wire drawn therethrough.

Fig. 4' is a view showing a piece of wire in side and end elevation as shaped by the die shown in Fig. 4.'

Fig. 5 is a View in end elevation of a die adapted to impart a rectangular shape to a wire drawn therethrough.

Fig. 5 is a view showing a piece of wire in side and end elevation as shaped by the die shown in Fig. 5.

Fig. 6 is a view in end elevation of a die adapted to impart oppositely disposed grooves in a wire drawn therethrough.

Fig. 6"- is a view showing a piece of wire in side and end Ielevation as shaped by the die shown in Fig. 6.

In these drawings the reference letter a has been employed to designate a frame upon one end of which is mounted a drawing block of ordinary design driven by gearing c from a driving shaft d operated in any approved way. The opposite end of the frame a is designed to rotatably support a bobbin e for holding a coil of wire f or the said bobbin may be mounted independently of the frame altogether.

The frame of the machine between the bobbin e and the drawing block b is adapted to support a rotatable die carrying member.

g in one end of which is tted a removable die h. The die carrying member g is adapted to receive its motion by a train of toot-hed gearing i from the driving shaft d and a pair or series of gripping rolls j are mounted on the frame between the die and the bobbin.

The die carrying member is supported in bearings g and its periphery is formed with gear teeth 7J which are adapted to mesh with the teeth of one of the wheels of the gear train z'. The rolls j act as guides for and prevent any tendency the wire may have to twist as it passes to the shaping die h and in order to facilitate the drawing operation the said wire can be passed through a lubricator lc of approved design, mounted on the frame near the guide rolls.

The end of the wire f is passed from the bobbin 'e through the lubricator lc, guide rolls 7' and die h and is secured to the drawing block b which is constructed in such a way as to prevent the wire mounting on itself and thereby increase the speed at which it is drawn through the die and so affect the pitch of the thread The die k is of somewhat similar construction to those commonly used for drawing wire and the opening therein may bepf -to be formed on the Wire without twisting the same in the slightest degree.

t The working or engaging parts Z of the die are shown somewhat exaggerated in size in Figs. 2 and 3 of the drawings with a view to drawing particular attention to this feature of construction.

The die carrying member is tubular in form and the die h is inserted in one end thereof and retained iixedly in position therein by means of pins L.

The ratio of the speeds of the drawing block b and the die h is maintained uniform when imparting a thread of particular pitch to the wire and by varying their respective speeds threads of different pitch can be cformed on the wire without changing the The die L is revolved in a plane at right angles to the forward movement of the wire and the shape of the opening of the die is imparted to the wire in a spiral form, the pitch of the spiral or thread depending entirely upon the relative speeds of the wire and the said die. The wire is drawn straight through the die L and is not twisted or rctated, the helical grooves, flat sides or ribs leing formed by the rapid rotation of the c 1e.

The gearing c for imparting motion to the drawing block b and the gearing i Jfor imparting motion to the die carrying member g are capable of adjustment to permit or variation of relative speeds so that the pitch of the groove or flat faces or ribs formed in or on the wire can be varied as required.

The speed of the die la. can be varied relatively to that of the drawing block b to produce grooves or ribs of different pitch by interchanging some of the gear wheels in the gear train z' or by substituting a wheel or wheels of diierent Sizes for any of the said wheels,y

If necessary, in order to remove any ragged edges or dirt left on the wire after the same has passed through the die the Wire is passed between flexible members as wire brushes m or the like which are pressed against the wire lby springs 'n and the brushes may be arranged to revolve automatically in conformity with the screw thread to eiectually brush off al] ragged edges or burs formed on the wire during the drawing operation.

I claim- 1. In a machine for forming helical threads .or grooves on round wire, a drawing die having an aperture other than circular axis of the said die, and-'means for rotating said die.

2. in a machine for forming helical threads or grooves on round wire, a drawing die having an aperture other than circular in shape, a dared entrance to and narrow bearing faces on the inner wall of the aperture of the die2 said narrow bearing faces being disposed 1n a plane at right angles to the axis of the die, gearing for imparting rotationl to the die, and a rotatable drawing block operated synchronously with the die to draw the wire therethrough substantially as described.

3. In a machine for forming helical threads or grooves on round wire, a drawing die having an aperture other than circular in shape, a flared entrance to and narrow bearing faces on the inner wall of the aperture of the die, said narrow bearing faces being disposed in a plane at right angles to the axis of the die., a rotatable holder for the die, a rotatable drawing block operated synchronously with the die to draw the wire therethrough, and gearing for imparting rotation to the die and drawing block substantially as described.

a. A machine for forming helical threads or grooves on fround wire comprising a frame, a drawing block rotatably mounted on the frame, a driving shaft and gearing for imparting motion to the drawing block, a die carrying member rotatably mounted in bearings on the frame and driven by gearing from the driving shaft, a drawing die fitted removably in the die carrying member and having an aperture other than circular in shape, a dared entrance to and narrow working faces formed on the inner wait of the aperture at the opposite end of the die, and means on the drawing block or engaging the wire to insure the same being -drawn through the said die substantialiy as described 5. A machine for forming helical threads or grooves on round wire fcomprisinf e frame, a drawing block and a spool rota tably mounted on opposite ends of the frame, a driving shaft and gearing tor irnparting motion to the drawing blocks a die carrying member rotatably mounted in bearings on the frame between the spool and drawing block, gearing operated from the driving shaft for imparting rotation to the die carrying member, a drawing die fitted removably in the die carrying member and having an aperte re other than circular in shape, a iared entrance to and narrow woriring faces formed, on. the inner wall of the aperture at the. eppgste end of the die, gripping means on thQ drawing block for engaging the end ofthe wife drawn through the die, and exibe .members interposed be tween the die and the mr/'ing block for removing burs formed @n the wire durin its passage through the Said die substantial y as described.

In testimony whereof I have a'ixed my signature in the presence of two witnesses.

JOSEPH BARTLETT DAVIES.

Witnesses:

WILLIAM A. ASHTON, WM. BoNNERUr.

Images