US1282496A - Automatic metal-working machine. - Google Patents

Description

H. P. TOWNSENDi AUTOMATIC META'L WORKING MACHINE.

' APPLICATION FILED DEC. a, 1914.

1 82,496 Patented Oct. 22, 1918.

2 SHEETSSHEET l 7 W I TNESSES: IN V EN TOR. 6% MW EQ WZJWM/ 4? y I A TT RNE Y.

H. P. TOWNSEND.

AUTOMATIC METAL WORKING MACHINE.

APPLICATION FILED DEC. 8. l9l4.

1 ,282,496, 7 Patented Oct. 22, 1918.

2 SHEETS-SHEET 2.

WITNESSES:

LATENT nnrca.

HARRY P. TOWNSEND, QF HARTFORD, CONNECTICUT, ASSIGNOR TO THE E. P. TOWN- SEND MANUFACTURING COMPANY, 013 HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

AUTOMATIC METAL-WORKING MACHINE.

Specification of Letters Patent.

Patented Oct. 22, 1918.

To all whom it may concern.

Be it known that I, HARRY P. TOWNSEND, a citizen of the United States, residing at Hartford, in the county of 'Hartford and State of Connecticut, have invented a new and Improved Automatic Metal-VVorking Machine, of which the following is a specification.

My invention relates more especially to that type of metal working machines in which the articles being formed are held in a chuck, and an object of my invention, among others, is to provide such a machine with means for preventing any but perfect blanks or blanks of proper size and form from being operated upon by the machine.

A satisfactory construction of machine embodying my invention and in the production and use of which the objects herein set out, as well as others, may be attained, is illustrated in the accompanying drawings, in Which Figure 1 is a view in elevation, partially in section, of a portion of a machine embodying my invention.

Fig. 2 is a top plan view of the same, with parts broken away to show construction.

Fig. 3 is a detail view illustrating the manner of delivering blanks to the carrier.

Fig. 4 is a detail view illustrating the conditions when too short a blank 'is delivered to the carrier.

Fig. 5 is a like view illustrating the conditions when a crooked blank is presented to the carrier.

Fig. 6 is a detail view illustrating the conditions that will exist to prevent too long a blank from being fed to the jaws, this view illustrating a portion of the carrier, feed fingers and pusher.

Fig. 7 is a detail view illustrating the oper ation of the stop motion mechanism.

In the operation of machines of the class herein referred to, in order to produce satisfactory' work much time is required to properly adjust and set the parts, this applying especially to the tools and feeding de vices. Should an imperfect blank or a blank of improper size be permitted to enter the chuck, the tools or other. parts of the machine acting upon the blank will at once become disarranged or broken requiring readjustment and resetting and causing much loss of time. My improved machine, herein secured to and also rising from the table and supporting a hopper 14 at its upper end, and 15 a work spindle mounted in bearings at the upper ends of the posts 11, a loose pulley 16 and a fast pulley 17 being mounted on and secured to the spindle in any desired manner. A runway 18, along which blanks slide from the hopper 14, is secured on the standard, that also has bearings for a carrier shaft 19 towhich a carrier 20 is secured, said shaft being rotated as by a connecting bar 21 with a crank arm 22 to place the carrier in position to receive blanks from the runway,-and said shaft being rotated in the opposite direction by a spring 23 to move the carrier to deliver blanks to a feeding device, one end of said spring being secured to the connecting bar 21 and its opposite end to a carrier operating lever 9 that may be actuated in any suitable manner, as by a cam (not shown) on the cam shaft 24, the carrier operatingmechanism above described being omitted from Fig. 2 of the drawings.

A pin 7 projects from the upper end of the lever 9 into a slot 8 in the connecting bar 21, so that said lever may have a move ment independently of said connecting bar. The spring 23 is sufliciently strong to move the connecting bar 21 and thus operate the carrier 20 under ordinary and normal conditions. When, however, an obstruction is interposed to themovement of the carrier, thenthe spring will yield and permit the pin 7 to move along the slot 8 without effectively moving the carrier. This construction is for a purpose to be hereinafter described.

The cam shaft 24. operates a feed cam 25 for reciprocatin a feed lever 26 mounted on a rock shaft 9 and havin a si'i pporting bar 27 upon which rotatable iced lingers 2% and a pusher 29 are mounted. Many of the parts 'herein illustrated and described form the subject matter of my copending application of Serial Number 847,771, filed June 27, 1914, and, except in combination with the stop motion mechanism, no claim is made herein to the elements above noted.

My invention is more especially:applied to the chuck operating mechanism, and While chucks of various constructions may beemployed I. prefer to use one in Which a reciprocating. member effects movement ofthe chuck jaws. In the special form of constructio'n. herein shown the chuck jaws 30 are 'pi'vota-lly. mounted in a chuck body 31 -s'e cured in any suitable manner toft-he chuck spindle 15 to be rotated thereby. Theinn'er ends' of these jaws are eonnectedby links'32 "With a chuck jaw operating plunger 33 upon the" frame of the machine, of vWhich'the bed constitutes apart, one end 40 of this lever. bein'g'forked and. each branch ofthe ffork' having rollers, 41 arranged to rest against a fiange on the collar 37, as shoivn'in Fig. 1 of the drawings. The-opposite endlof ithisleve r is constructed to engage'a chuck "operating-cam 42 secured to the camshaft 124, as shown'herein this 'end of said lever bearing a roller to engage the cam. lThe parts are so constructed that when the plun- "ger" 33 has-been forced by'the spring 34 in a vdirection to close the chuck jaws, and the-latt'ergraspablank of proper 'size, the'le'ver will be loose orqui'escent, that is-,it will have 10' pressure against theca'm 42 or against the flange .on'the "colla'r37, but Will be at rest and in the position'shoivnlin Fig. 2-of ithe drawings so that therejis no undue Wear'by reason or rotation of; the contacting rollers, "such'riollers being operated only at tlief tiine viih'en'the'lever is mOVed'byQ the can 'projection o'nthe cam 42 inadire'ction to" open the chuck jatvs. The collar '37 however, is: pernitteda movement in a direction toi'cl'ose the chuck'jaws to an extent more than willfbe required to close. such jawsnpon a blank of "proper fsize, and any means may be employed, if desired, for adjusting the parts so that the machine may be adapted to'wo'rk uponclifiei'ent classes of blanks.

The cam 42 has a cam projection on its side-facefor forcing the-lever39 in one di- -rect1on, thiscam-bemg-formed to hold the chuck jaws open until-after ahlan-k has been inserted between sa1d aws and then release the leveroi) vtoip'erniit closing movement of the jaws, and a spring seated stop motion plunger 43 projects through the oam to the .back face thereof, said plunger being so lo catedthat one end, 111 one position of the plunger, may be operated upon by the lever 39 and the opposlte end of the plunger, 111

another positionthereof, Willbe in position to "strike one end of a" stop motion or 'rje'leasmg lever44'1nountec'l upon the frame of the 1nachine,1the opposite end of said lever ing in position to engage a lug 45' projecting from the'un'der side of a belt shifter 46 pivotally mounted upon the frame of the machi'ne in position to move the b'eltfrom the fast to the loose pulley and vice-versa, a "belt shifter spring 47'se'cured to the frame ofthe 'machine and to said-belt shifter operating 'sition, this abnormal position beingvvith 'the roller on 'the end of the lever resting against 'the'side'ofthe cam 42' and hence inthe'path of movement of the stop motion plunger position vvill' be causediivhen no ob ect is between the chuck jaws by 'tl eiaction of the spring 34, plunger 33"a1'id'cella'ri 37.

lVhen'the lever 39 is in" position aiid the stop"motion 'pluiiger "43 is Lcarriedilagain'st the roller on the. end of said lever the rotating cam '42,. saidplu'nger 43 xvi ll' 'be shifted the cam 42so"that its patlr-of inoveirie'nt Will be in line with thefend. or

the stopmotionlever 44, and said leverfby the operationfiofitheplunger 43 W'illflbe rocked on 'its pivot and its end 'opposite'that engaged by said plunger will" befinoved downwardly out of 'engagementYvvith t-he 'iu'g 45 on the beltshifte'r lever, and the latter will be" forced by its spring 47 to 5 shift the belt to'the loose 'p'uue and thus stop the operation of the machine. This exce'ssive or abnormal movement'of the collar 37 vvill take place during ever tyne? ermovement off the machine in which "a defective blank,

as ;-a erOoked blank, too' long. a fblank, too

sho'rt a blank or. too small. a blank, to o large zi -blank may. be presented to the" unwayf for .,deli\7ery to f the ,fcari ier. This "wz-ilhbef'ef "fected' 1n the'followingpmann'er;

..- The rier being eprovlded with blank receiving recesses' .in-Q the carrier --l,ugs 48,..if. too Shane blankbefpresentedthe blank Willie assume the position-shown inFig. 4, 'blockin'glthe carrieragalnst movement. The carrier operating lever 9 W111, however, be moved, the pin 7 traveling along'the slot 8 and'tensioning thespring 23 to permit movement of said lever as hereinbefore described, and a blank being thus prevented from delivery to the feed fingers 28 and thus to'the chuck jaws, the latter will close together, permitting the excessive movement of the collar 37, and effecting operation of the stop motion above described. Should a crooked blank be presented to the c'arrier'it will assume the position shown in Fig. 5, or a reverse position,

the runway being of a Width to compel the blank to assume one of said positions. The carrier will thus be blocked against movement and the actuation of the stop motion mechanism will be effected in the same manher as above described with respect to too short a blank. Should too long a blank be presented to the carrier it will be delivered in position to receive the feed fingers, but in this case the pusher 29 will strike the blank, as shown in Fig. 6 and prevent the feed fingers from grasping it, and the blank will thus not be delivered to the chuck jaws, and operation of the stop motion mechanismwill thus be effected as above described. Should a blank too small in diameter pass along the runway, it will be delivered by various mechanisms to the chuck jaws, but being too small the chuck jaws will close to an abnormal extent and thus permit the excessive movement of the collar 37 and the actuation of the stop mechanism in the manner above described.

Should a blank too large in diameter pass along the runway, the blank receiving recesscs in the lugs 48 will be so small that they cannot receive it, these recesses being substantially the size of the blank intended to be operated upon by the machine. In this case the blank will either block the movement of the carrier or be forced back into the runway, in either instance, no blank being delivered to the feedfingers, the stop motion will be caused to operate in the manner hereinbefore described.

While I have shown herein a satisfactory construction of mechanism embodying my ideas, it will be understood that this may be departed from to a greater or lesser degree and yet be within the spirit and intent of the invention as defined by the claims herein.

I claim- 1. In a metal working machine, a chuck having chuck jaws, means for driving the chuck for operation upon a blank held therein, a chuck aw operating member movable to an excessive degree and beyond a point required to hold a blank, meanstor retaining the jaws in position to hold a blank, and a stop motion mechanism including a member connected with said chuck jaw operating member to be actuated thereby during its excessive movement.

2. In a metal working machine, a chuck having chuck jaws, means for moving the chuck for operation upon a blank held there in, a chuck operatingmember movable to an excessive degree and beyond a point required to hold a blank, a cam to actuate the chuck operating member, a stop motion mechanism, and a member borne by the cam in position to be' engaged and moved by the chuck operating member during its excessive movement and into position toengage and operate'the stop motion mechanism. 1 i

3. In a metal working machine, a chuck having chuck jaws, means for driving the chuck-for operation upon a blank held th erein, chuck operating mechanism including a member movable to an excessive degree and beyond a point required to hold a blank, means for holding the jaws in clamping po- "sition, a cam for operating said member, a

stop motion mechanism including a releasing lever, and a member borne by said cam to be engaged by said chuck operating member during its excessive movement and to be moved into position to strike said releasing lever.

4. In a metal working machine, a chuck having chuck jaws, a chuck operating collar, connections between the jaws and collar, the latter being movable to an excessive degree beyond apoint required to hold a blank, means for holding the jaws in their clamping position, a stop motion mechanism, and a connection between said stop motion mechanism and collar to be operated during the excessive movement of said collar.

5. In a metal working machine, a chuck having chuck jaws, means for moving the chuck for operation upon a blank held therein, a chuck actuating collar operatively connected with the jaws, means for holding the jaws in their clamping position, a lever cooperating with said collar, a cam to operate' said lever, a member borne by the cam for engagement by said lever when positioned by the excessive movement of said collar, and a stop motion mechanism including a part to be operated by said member upon the cam.

6. In a metal working machine, a chuck having chuck jaws, means for driving the chuck for operation upon a blank held there in, a chuck actuating collar operatively connected with the chuck jaws, means for holding the jaws in their clamping position, a lever cooperating with said collar, a cam for actuating the lever,-the latter being positioned for quiescent condition during certain periods, a member borne by the cam to be engaged by said lever when positioned by the excessive movement of said collar, and a stop motion mechanism including a part positioned to be engaged by the member on the cam.

7. In a metal Working machine, a chuck having chuck aWs, meansT-for driving the in, a collar operatively connectedvwith the jaws and movable to an excessive degree beyond a point required to hold a blank, means for-holding the ]LWS'1I1 tl161l clamping position, a cam operatively -connected with said collar, aspring pressed plunger borne by said camand normally positioned to. be operated by the excessive; movement of the collar, and a-stopm-otion including a stop motion lever positioned'to be engaged by said plunger whenmoved -from its normal position. a

V 8. Ina metal working machine, a spindle, a chuck connected With said spindle and having chuck-jaws, a belt shifter operatively positioned 'Wlth respect to said spindle,

means-for forcing'saidshifter in one direotlon, memberborne upon the spindle oper- V atively connected Withsaid jaws and movable to-anexcessive degree beyond a point cessive movement, and a stop tenet-ion lever operatively connected with the belt-shifter and located to be-.eng, ged' by said plunger in its abnormalposition.

' 9. In ametal yvorking.maehine, a chuck having chuck aws, means-"tor dr v ngthe chuck for operation upon ablanl ;helcl tl1e1'e= in, means operativelymconnected with the jaws to close them, blank conveyinglmechanism construoted to prevent delivery of an e improper blank to the chuck jaws, and a stop motion mechanism mperatively connected Wltll said jaw closing -means to be operated thereby.

v HARRY P. TOWNSEND. Witnesses V "ARTHUR .BpJnnnms, F.:EAT0N.

Gopies of.thispatentimaytbeobtained-for'five-eents=each,. by addressing the commissioner bflatents,

Washington, D50.

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