US1696225A

US1696225A - Thread-forming mechanism

Info

Publication number: US1696225A
Application number: US28865A
Authority: US
Inventors: Blood Harold Langley
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1925-05-08
Filing date: 1925-05-08
Publication date: 1928-12-25
Anticipated expiration: 1945-12-25

Description

H. L. BLOOD EAD FQRMING MECHANISM THR Filed may s, 1925 im. 25, 192s.

lilfllli Patented Dee z5, 192s.

UNITED .srATEfsf 1,696,225 PAT-ENT OFFICE.'

.HAB'OLD LANGLY BLOOD, 0I OAK PARK,- IIJLINOIS, ASSIGNOR T0 WESTERN ELECTRIC COIPANY, INCORPORATED, F NEW YORK, N. Y., A. CORIQRALIONv OF NEW YORK.

THREAD-nonnina MncHaNrsu.

Application led May 8,

rIhis invention relates to thread forming. mechanisms, and has for its primary ob]ect the provision of an improved mechanism for rapidly and economically forming threads upon blanks. In order to attainthis object thereI is provided in accordance with the general features of this invention in a machine for forming threads upon screw blanks, means for successively feeding blanks in a predetermined spaced'relationship so that threads are formed on a plurality of blanks during each Working stroke of a reciprocating die cooperating with'a fixed die.

Other objects and advanta es of the invention will more fully appear romthe following detailed description taken inconnectionf with the accompanying drawings which illustrate one embodiment thereof, and in Fig. 1 is a fragmentary plan'view of a threadrolling machine embodying the features of the invention with the operating I parts shown in position with two blanks between the threading dies and at the beginning of the threading operation upon the second blank; f

Fig. 2 isa verticalsectional view taken upon the .line 2-2 thereof, and

Fig. 3 is a fragmentary plan view of Fig. 1 showing the relative positions of the blank feedin Afingers during the positioning of a blank tween the threading dies.

Referring to the drawings wherein like reference numerals designate like parts through- `Aout the several views, 10 indicates the frame or bed ofa thread rolling machine -which may be of any well-known type", all parts not necessary to a complete understanding of the in- L0 v'vention having been omitted. A stationary die 11 is suitably mounted in the frame 10 and a movable die 12 carried on a slide member 13 is arran ed to be reciprocated upon a suitable guideway (not shown) provided in the 5 frame. A longitudinal reciprocating move- -ment is imparted to the slide 13 through a connecting rod 16 pivotally connected at one end to the slide as indicated at 17, the opposite end of the rod V16 being operatively connected to a crank disk 18 fixed for rotation upon a driving shaft 19 in turn rotated by suitable driving means (not shown) in the direction indicated by the arrow (Fig. 2). Screw blanks 2O are fed from any suitable of the movable die.

1925 Serial No. 28,865.

hopper-mechanism (not shown) down a chute 21, from which they are delivered one at a time to a position betweenthe stationary and mOvable dies l11' and 12, respectively, by a feedin mechanism to be hereinafter describe `Heretofore, in some machines for rolling threads upon screwblanks a. single blank has been fed to a point between the dies at intervals corresponding to each working stroke of the movable'die, thereby rolling a thread 11pon one screw blank for each: working stroke In the blank feeding mechanism to fbe presently described in detail two blanks are fed in succession and properly spaced from each other between the threading dies during the time thel moving die has advanced a short distance, so that threads are rolled upon two blanks during each working stroke of the movable die.

The blank feedin mechanism shown in the drawings will now e described." Associated with the lower end or outlet point of the chute 21 "(Fig. 2) is a mechanically actuated fingerV 22 which retains the descending column of screw blanks 20 in the chute and at the proper instant separates the lowermost blank from those.behind it and forces the separated blanks outwardly and in front of a pusher retracted and ready to begin separating a blank from the column and moving it into position at the beginning of the next stroke of `the,die 12. The actuating means for the fingers 22 and' 23 comprises the following: Secured to the shaft 19 for rotation therewith, are cam disks 25 and 26' .provided with cam faces 27 and 28, respectively. The cam faces 27 and 28 are adapted to be angularly adjusted relative to each other, the disk 26 being provided with a slot 29 of suitable length through which a screw ,30 is inserted and threaded into the disk 25. The head of the screw when clamped against the outer disk 26 retains the disks and thereby the cam faces 27 and 28 in a set angular relation to each other. The purpose of this adjustment of the cam faces 27 and 28 will be made apparent hereinafter.

In engagement with the cam faces 27 and 28 is a cam roller 33 rotatably mounted upon a lever 34 fulcrumed at its lower end upon the frame 10 as indicated at 35, the upper end thereof being adjustably secured to a rod 36. One end of the rod 36 is threaded and projects through an opening formed in an ofi'- set portion 37 of the lever 34 and at either side thereof. upon the threaded portion of the rod, is threaded a retaining ynut 39. A tension spring 40 suitably connected at opposite ends to'the lever 34`and the frame 10 acts to cause the roller 33 at all times to follow the cam faces 27 and 28. The purpose of providin for the adjustment of the rod 36 upon the ever 34 will be made apparent hereinafter. The right hand end of the rod 36 is pivotally connected as indicated at 41 to a ever'42 fulcrumed intermediate its ends as indicated at 43 upon the frame 10. To the upper end of the lever 42 is pivotally secured one end of a link 44, the opposite end of the link being provided with an elongated slot 45 within which is adapted to slide a pin 48` fixed in the upper end of a lever 49the lower end of which lever is fulcrulned as indicated at 50 u on the frame 10. A tension spring 51 suita ly connected at opposite ends to the lever 49 and the frame 10 normally retains the in 48 at the right hand end ofthe slot 45, t e purpose of which will be made apparent hereinafter. Pivotally-connected to the lever 42 in axial alignment with the pivotal point of the rod 36 therewith, is a slide 52 upon the opposite end of which is formed the pushing finger 23. Adjacent the slide 52 is another slide 53 which is pivotally connected to the lever 49, as indicated at V54, intermediate the ends thereof. The opposite end of the slide 53 carries the finger 22 which is secured thereto by screws 55. The slides l52 and 53 are mounted upon suitable guideways. (not shown) provided in the frame'10. 1 The operation of this mechanism is as folows:

The shaft 19 revolving in a clockwise direction causes the cam faces 27 and v28 of the

disks

25 and 26 to en age the cam roller 33 in succession. The re atlve angular relation of the cam faces 27 and 28 which determines the interval of time between the engagement of the cam faces with the cam'roller is first will be formed upon the blank, while for the first blank the nuts 39 are adjusted upon the rod 36 to cause the blank'to be inserted between the dies when the threads of the.

dies are properly aligned and at substantially the instant the movable die 12 starts upon its working stroke.

In Fig. 1 the parts are shown in their relative positions at the completion of the feeding movement with two blanks positioned between the threading dies, the moving die having advanced only a short distance. As the disk 18 continues to rotate in a clockwise direction the connecting rod 16 will move the movable die 12 to a point shown in dotted outline in Fig.Y 1 whereupon the threaded blanks 20, also indicated in dotted outline, will drop free of the dies and into a suitable hopper (not shown). The die 12 thereafter is .returned to the position shown in Fig. 3 and thereupon the cam face 27 engages the cam roller 33 and rocks the lever 34 counter-clockwise, causing the rod' 36 and attached finger 23v to move toward the left. thereby turning the lever 42 clockwise an movin the link 44 to the right. As the link 44 moves the'spring 51 is allowed. to turn the lever 49 clockwise about its pivot, thereby causing the fin er 22 to advance to the .position shown in ig. 3 to separate a screw blank 20 from the column of blanks in the chute21 and-move it in front of the fin er 23 as shown in Fig. 3. The movement o the fingers'22 and 23 in opposite directions as just described takes place substantially at the same time and in timed relation with the movement of the movable-die 12. Immediately upon the finger 23 feeding a blank in front of the finger 22 and between the dies, the movable die 12 starts to move toward the right upon its working stroke and the rolle 33-rides y,down the cam face 27 whereupon the spring 40 is permitted to move the' rod 36 and atand right respectively and positioning an? 'other blarik in front of ,the fin er 23. In the continued rotation of the cam 'sks the roller 33 rides down the cam face 28, thereby movmg the linger 23 toward the right and inserting the second blank 20 between the cooperating dies asl shown in Fig. 1 ready foi' the completion of the workin stroke of the die 12. In case a blank 20 ecomes lod in front of the finger 22 for some reason t e slot 45 permits the various parts to o rate but the finger 22 is not forced towar the right against the lodged blank.

From the foregoing description!J it will be seen that a mechanism is provided which is of comparatively simple formation in its construction and the arrangement of its parte and one by which the output of a thread rolling machine of the type described may be materially and economically increased.

`What is claimed is:

l. In a thread rolling mechanism, a pair of die members having cooperating die faces, means for causing an intermittent relative motion therebetween to form a screw thread on a blank interposed between said faces, and means for successively feeding a plurality of blanks from a common point to and between.

tween the blanks fed between the die mem bers.

3. In a thread rolling mechanism, a reciprocating slide, a member carried thereby and having a die face, a fixed member having a die face cooperating with the first mentioned die face for formingl threads on a blank interposedy therebetween, means cooperating in timed relation with said slide for feeding a. plurality of blanks between said dies for each working stroke of the reciprocating slide and means for controlling the timed relation of the feeding means and the reciprocating. slide.

4. In a thread rolling'mechanism, a pair of members having cooperating die faces, means holding a supply of blanks, a plurality of oppositely'movable reciprocable fingers for feeding blanks from said supply to said dies at predetermined intervals, and means for causing a relative reciprocatory motion between the membersto form a I thread on a blank" interposed between said faces and for causing said fin ers to feed a plurality of blanks between sai faces during l said thread forming relative movement of the dies. v

5. vIn a thread rolling mechanism, a pair of members having cooperating die faces, means for causing a relative reciprocatory motion therebetween to form a threadl on a blank interposed between said faces, means cooperating in timed relation with said slide for feeding a plurality of blanks between said faces for said thread forming relative movement of the dies, and means for varying the cooperating timed rela-tion between the first and second mentioned means.

6. In a thread rolling mechanism, a pair ofdles, means for causlng a relative reclpro catory motion therebetween lto form a thread on a blank, means cooperating in timed re lation with said means for successively feeding a plurality of blanks between said dies for said thread forming relative movement of the dies, and means for adjusting said last .mentioned means to vary the time interval between successive feeding movements thereof.

7. In a thread rolling mechanism, a pair of dies,means for causing a relative motion therebetween to form a thread on a blank, means for feeding blanks between the dies and a cam member actuated by the first mentioned means for causing the last mentioned' means to successivel feed a plurality of blanks during said t read forming relative p movement of the dies.

8. In a thread rolling mechanism, a pair 'l of dies, means for causing a relative motion therebetween to form a thread on a blank, means for feeding blanks between the dies, a composite cam member comprising a plurality of cam elements actuated by the first mentioned means for causing the last mentioned means to successively feed a plurality of blanks during said thread forming relative movement of the dies, and means for-adjusting therelative position of the cam elements to vary the interval of time between the feeding of the blanks.

.In witness whereof, I hereunto subscribe my, name this 30th day of April, A. D., 1925.

HAROLD LANGLEY BLOOD.