US2065066A - Thread rolling machine - Google Patents

Description

Dec. 22, 1936. R. J.' FRETER Er Al. '2,055-066 THREAD ROLLING MACHINE Filed April 4, -1936 Sheets-Sheet 1 Bec, 22,1936 R. J. FETR ET Al. 2,055,066

' THREAD ROLLING MACHINE Filed April 4, '1936 Sheets-Sheet 2 iM 10 I 7 d- 24- i En i f l s Patented Dec. 22, 1936 UNITED STATES PATENT OFFICE THREAD ROLLING MACHINE Connecticut Application Api-11 4, 1936, sei-m No. 12,756

9 Claims.

. a fixed concave die and a continuously rotating convex die.

The object of the invention is to provide a machine of this type through which the blanks will travel in such direction and will be acted upon in such a'manner that operative speed of the machine may be accelerated and thus the output increased above that of the prior thread rolling machines.

This object is attained by so designing and relating thecooperating blank feeding and thread 'rolling mechanisms that the blanks will travel down an inclined track and be fed to and between the fixed die and rotating threading die and be operated upon by the dies without change in the parallelism of their longitudinal axes, which is accomplished by inclining the dies to substan-l tially the same `degree as the inclination of the feed track, so that the travel of the blank will be continuously downward on the same incline to the vertical fromv the time the blanks are deposited in the track to the point where they are discharged fully threaded.

In the accompanying drawings Fig. 1 shows a side Aelevation of the machine with parts'of the frame cut in section to expose the interior construction. Fig. V2 isl a View looking at the feeding and threading mechanism in the direction indicated by the arrow 2 adjacent to Fig. 1. Fig. -3 is a. plan on larger scale of the monitor which lets but one blank at. a time down the feed track. Fig. 4 is a sectional elevation of the parts shown in Fig. 3. Fig. 5 is a plan view of'the gate for locating a blank at the lower end of the track and the pusher for en- 40 tering the blank between the dies. Flg. 6 is an elevation of the parts shown in Fig. 5. Fig. I shows in elevation the levers which :1o-operatively connect the monito gate and pusher.

The unthreaded blanks -are thrown in a promiscuous mass into a hopper from which they are transferred to an inclined track. Any common type of hopper may be used, that shown having walls 8 supporting elevator arms 9, which are rotated by suitable chain connections I6 50 driven from the pulley shaft Il, for picking up and depositing the blanksin the upper end of the inclined track I2, Fig. 1. Y The blanks slide i'n `succession hanging by their heads vdown the track until they are arrestedby the monitor. The monitor shown has a detaining pin I3 and a separating pin Il. These pins project from laterally movable slides I5 and I6 which are alternately reciprocated in a bracket I1 that is bolted to the machine frame, Fig. 3. Projecting downward from the slide I5 is a pin I8 that 5 is engaged by a forked end of a rocker I9 and projecting downward from the slide I6 is a pin 20 that is engaged by a forked end of the rocker I9, which turns on the stud 2I, Fig. 4. The slide I5 is normally drawn back by a spring 22 10 and is pushed forward by a screw 23 that is carried by a lever 24. This lever has a forked end that is engaged by a stud 25 which extends upward from a lever 26 that is fastened to a rocker shaft 21 which has an arm, 28-with a 15 roll 29 that is held in engagement with the periphery of the cam 3l! on the cam shaft 3I by the tension of the spring 32. By the action of this mechanism the pin I3 at the proper time is withdrawn and allows the lowest of the blanks 20 detained by the pin to continue down the track. As the detaining pin I3 is withdrawn the rocker causes the separating pin Il to be advanced so as to hold the remaining blanks in the track until such time as the detaining pin is advanced, then 25 the separating pin is withdrawn.

The cam shaft is supported on an incline with its axis substantially 90 degrees from the incline of the feed track, by a long bushing 33 fixed in the frame and a shorter bushing 34 held by a 30 bracket 35 attached to the frame, and is connected by a coupling 3B with a shaft 31 'that is continuously driven from the pulley or motor shaft Ii through a reduction gearing 38, mounted in the frame.

On the end of the cam shaft is a sleeve 39 and the rotatory die I0 is clamped on the shaft between the sleeve and a. collar 4I on'tlie shaft, Fig. 1. The fixed die I2 is adjustably fastened to the frame adjacent to the lower end of the 40 track, Figs. 2, 5. The rotatory die shown has two peripheral convex threading segments 43 so that in each cycle two blanks will be threaded, and the cam 30, which is adjustably fastened by bolts ll to the collar 45 xed to the cam shaft, 45

Fig. 1, has two low sections I6 in order that two blanks will be allowed to feed during each cycle. There may be as few or as many threading sections on the rotatory die as is desirable and of course to co-operate therewith there will be a corresponding number of low sections on the cam which actuates the feed mechanism.

SlidabLy retained between the end of the fixed die and the lowerend of the track is a gate 41 that normally closes the entrance end of the the gate 41 to be moved up the track and the vtating die, in the same inclined plane.

opening between the fixed and rotatory dies. Engaged with this gate is the end of anl arm 48 that projects from the lower end of a spindle 49 to the upper end of which is attached an arm 50, Figs. 3, 4. The tension of a spring 5| tends, through these arms and spindle, to keep the gate in closed position so that a blank cannot pass into the opening between the dies. A pin 52 extending upward from a curved slide 53, at the correct time, engages the arm 50 and so pushes it that the gate will be moved up the track and open the entrance to dies and permit the feeding of a blank between the dies.

The slide 53 is movable in a curved way 54 in the frame and fastened to it is an arc-shaped pusher plate 55, that curves about the rotatory die, Figs. 5, 6. An end of the slide 53 is forked and pivotally connected with a block 56 that is movable in a forked end of an arm 51 which is pivoted on the rocker shaft 21 and is adjustably fastened, by bolt 58, to an arm 59 that is fastened to the rocker shaft, Figs. 5, 7. When a low section of the cam 30 passes under the roller 29 vand allows the shaft to be rocked by the lever 26 and spring 32 the pusher slide 53 is moved and through the means described causes pusher plate 55 to thrust a blank from the lower end of the track into the opening between the dies, the gate, of course, moving out of the path' of the blank slightly in advance of the pusher. As the blanks reach the end of the xed die they drop through an opening 60 into a pan 6l.

In this machinethe axis of the cam shaft be'- ing inclined at substantially 90 with relation to the incline of the track, the blanks slide down the track, are fed directly to` the dies and are carried between the dies by the continuously ro- This allows the machine to' be run very rapidly. The rotating dieand the single cam which controls the actions of the interconnected monitor, gate' and pusher mechanisms, being on the same shaft the active members co-operate to perform their respective functions accurately and synchronously, which ensures precision work notwithstanding the machine is operated at'high speed. The cam shaft is not only supported for a considerable distance along its length, but is also supported beyond the rotatory die by a substantial bearing so that the thrust caused by the rolling of a blank between the dies is sustained without yielding or side wear of the shaft. The dies are adjustable to ensure their exact cooperation, and dies for different sizes of blanks and characters of thread may be readily substituted.

The invention has been illustrated and described herein as embodied in a machine constructed for rolling screw threads, which is the.

primary object of the invention, however, it is obvious, and is within the scope of the invention, that the machine can be utilized for knurling, planishing, sizing,lserrating, grooving and marking blanks, by simply substituting the requisite dies. For these operations the. monitor, gate and pusher mechanisms may be disconnected, allowing the blanks to run through the machine in a continuously uninterrupted-manner a`s for these purposes it would be unnecessary to mate the xed and rotatory dies. Y

The invention claimed isz- 1. A machine for rolling screw threads which comprises a fixed concave die and a co-operating 'continuously rotating convex di`e,the axes of said dies being substantially coincident and vertically inclined, a track for leading blanksdirectly to A said gate, monitor and pusher.

2. A machine for rolling screw threads which comprises a fixed concave die having an inclined operating face, a co-operating continuously rotating convex die having an inclined operating face, a vertically inclined cam shaft carrying the rotating die, the degree of inclination of said shaft being the same as that of said die faces, an inclined track lfor leading blanks directly to the opening between said dies, a monitor for permitting the blanks to slide bygravity one at a time down the track, a gate normally obstructing the path of the blanks from the track to the dies, a pusher for moving the blanks from the track to the dies, interconnected means for actuating said monitor gate and pusher, and a cam on said cam shaft for actuating said interconnected means.

3. A machine for rolling screw threads which comprises a fixed concave die, a co-operating continuously rotating convex die for rolling threads on blanks, the arcs of said dies having substantially coincident vertically inclined axes, and a vertically inclined track down which the blanks feed by gravity hanging by their heads directly to the entrance opening between said dies, the inclination of said track and the faces of the dies being so related that the blanks to be threaded pass down the track and between thewhich the blanks f eed by gravity hanging by their heads directly to the entrance opening between said dies, said track being vertically inclined in a line that is substantially at right angles to and radial with relation to the axes of the dies.

5. A machine for rolling screw threads which comprises a single xed concave die, a co-oper-v ating continuously rotating convex die having a plurality of threading segments on its periphery the axes of the arcs of said dies being substantially coincident and horizontally inclined, and a single vertically inclined track down which the blanks feed by gravity hanging by their heads directly to the entrance opening between said dies, the inclination of 'said track and faces of the dies being so related that the blanks to be threaded pass down the track and between the rolling edges of the dies inclined to horizontal.

6. A machine for rolling screw threads which comprises a xed concave die, a co-operating continuously rotating convex die for rolling threads on blanks, the .arcs of said dies having substantially coincident vertically inclined axes, a vertically inclined track down which the blanks feed by gravity hanging bytheir heads directly to the entrance opening between said dies, the inclina- 7'5 tion of said track and the faces of the diesrbeing so related that the blanks to be threaded pass down the track between the rolling edges of said dies in substantially the same inclined plane, a

gate at the lower end of the track normally obstructing the path to the opening between 'the dies, a cam rotatable with the rotating die and means actuated by said cam for moving said gate out of the path of the dies.

7. A machine for rolling screw threads which comprises a fixed concave die, a co-operating continuously rotating convex die for rolling threads on blanks, the arcs of said dies having substantially coincident vertically inclined axes, a vertically inclined track down which .the blanks feed by gravity hanging by their heads directly to the entrance opening between said dies, the inclination of said track and the faces of the dies being so related that the blanks to be threaded pass down the track and between the rolling edges of said dies in substantially the same inclined plane, a slidable gate normally obstructing the path from the gate to the opening between the dies, a cam rotatable with the rotating die, and means actuated by said cam for sliding said gate up the track and out of the path to the dies.

8. A machine for rolling metal blanks which comprises a nxed concave die. a co-operating continuously rotating convex die for rolling threads on blanks, the axes of tbe arcs of said dies being substantially coincident and inclined to horizontal, and an inclined track leading directly to the opening between said dies. the inclination of the aires of said dies and track being so related that the blanks to be rolled, hanging by their heads with their axes inclined, pass down the track by gravity and between the dies in substantially the same continuous inclined plane.

9.AA machine for rolling metal blanks which comprises a fixed concave die and a co-operating continuously rotating convex die for rolling threads on the blanks, the axes of the arcs of said dies beingsubstantially coincident and inclined to horizontal, and a track for leading blanks to the opening between said dies, said track being vertically inclined in-a plane that extends substantially at the same inclination as the faces of the dies, whereby the blanks will pass down the track and between the working edges of the dies lin the same continuous inclined plane with their axes inclined to horizontal. i

ROY J. FRETER. ALBERT H. GAESS.

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