US2121818A - Punching mechanism - Google Patents

Description

2 Shets-Sheet 1 P. H. NAST PUNCHING MECHANISM Filed Dec. 3, 1934 m., EN

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y June 28, 1938. P. H. NAST .2,121,818

PUNCHING MECHANI SM Fil'ed Dec. 5, 1954 2 sheets-sheet 2 I mi A TTORNE Patented June 28V, 1938 f f 2,121,818v PUNGHING MEoHANIsM Paul H. Nast, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application December-3, 1934, Serial No. 755,730

14 Claims.

This invention relates to punching mechanism, and ,more particularly to inflprovementsV in a punching mechanism for reforming the bore of a hollow ,rock drill steel or similar tubular articles.

In hollow rockvdrill steels, and `similar tubular I articles, theborein the steel adjacent thebit and by driving a punch pin with a .hammeringaction 'Frequently during this reforming operation, theV shank becomes deformed during the sharpening process, and it is often necessary to reform the hereafter the sharpeningprocess is completed. This reforming operation is usually accomplished intothe steel bore to open and reform the bore.

punch pin sticks in the, steel bore and some diffi- V culty is lencountered ineffectingreleaseA Vof the punch pin from ,theusteeL A primary object of the present vinvention is to 1 provide an improved drill steel punching mecha.-

nism whereby the punch pinmay be driven with a hammering action into and out of the steel bore, thereby to facilitate the bore reforming process. Another Vobject is to-provide an improved drill steel lpunching mechanism having Van improved vrhammer mechanism vformdriving the punchvpin into` and outJ of .thedrill steel bore, Yet another object isto. provideanimproved hammer mechanism rfor peicussively actuatingV the punch pin bothV during the hole opening and withdrawal operations, the hammerrnotor percussively actuatingthe punch pin during withdrawal, thereby to leliminate any possibility Vof a stuck pin. Still another object is to provide in a punching mecha- `nism'of the above character improved means for ieedingthe punching mechanism toward and from, the work and having embodied therein improved. feed. control means'. Yet another object Iisto.provide an improvedV feedcontrol'meansV for automatically reversingthe direction of ,feed upon completion: ofthe hole, opening function and having associated therewithl improved means for varying' the range of feeding movement. These andother-objectsand.advantages.of the invention will, however, hereinafter-more fully appear.

I-n-the accompanying drawings there is shown, for purposes `of illustration, oneform which th invention'mayvassum'e inV practice. f Y g In thesedrawings,-'` y f Figfl'isaplanview of'y the illustrative embodiment'of the improved :punching mechanism, to-

l i getherA withy fits' associated supporting means. y 1 Fig. 2 is a side elevational viewof the'punching means generally designated II.

Fig. 4 is a vertical sectional view taken substantially on line 4--4 of Fig. 1. i Fig. 5 is a cross sectional view takensubstantially on line 5 5 of Fig. 2. Y

Fig. 6 is a detail sectional View taken on line 6-5 of Fig. 2.

Fig. '7 is an enlarged vertical sectional View similar to Fig. 4 showing parts in a different position.

Fig.Y 8 is a horizontal sectional view takensubstantially on line 8-8 of Fig. 5.

Fig. 9 is a cross sectional view taken substantially on line 9-9 of Fig. 7. f

Fig. 10 is a vertical sectional view taken sub,- stantially on line IU--I of. Fig. 5. v g

Fig. 11 Vis av horizontal sectional view taken substantially on line ll-II of Fig. A5.

Fig. 12 is an elevation of the control valve.

Inithisillustrative embodimentY of the 'invention, there is shown a punching mechanisnngenerally designated I, mounted on a suitablesupport 2 in juxtaposition with a suitable clamping Y mechanism, generally designated 3, this support and clamping mechanism being generally the same as that described in myV copending applica.- tion Serial No. 755,729, vi'lled of evendate'herewith. Supported between the jaws ofthe clamping mechanism 3 is a hollow rock YVdrill steell4 having its bit 5 engaging a suitable stop andpositioning plate 6, the clamp mechanism and stop plate maintaining the drill steel in longitudinal alinement with the punching mechanism so that the punching mechanism maybe fed withrespect to the drill steel to effect reforming of the drill' steel bore upon completion of the steel sharpening process. As the particular form of clamping mechanism and stop plate for vmaintaining the drill steel in bore reforming position do not herein is yconsidered unnecessary.

Now referring to the improvedpunching mechanism I, it will be noted thatsecured to avertical plane face 'l of the support 2, asby screws 8, is a frame 9 having parallel honizontaljguideways I 0, I0 and supporting improved control Mounted in the lframe guideways lare vlateral, guides' I2, I2 formed on projections depending from the bottom of the cylinder I3 of a punch pin hammering mechanism, generally designated I4. This hammering mechanism is Yof the differential piston, valveless type, andthe hammer motor -cylinder I3 has a large bore I5 and anralinedre- 4o mentioned above, further, description of the same duced bore l; and reciprocable in the bores of this cylinder a hammer piston il having a large head i8 fitting the bore i5 and a reduced head i9 fitting the bore i5 and formed on a rearward projection integral with the piston head i8. A punch pin 2li is secured by a suitable pin lock 2l to a cylindrical striking block 22 recprocably mounted in a bore formed in the front motor head 23. The rear end of the motor cylinder is closed by a rear head block 24, and the front and rear heads are maintained in assembled relation with respect to the cylinder by usual side bolts 25, 25. The cylindrical striking blockV 22 has secured within the bore thereof, by across pin 26, the forward end portion of a cylindrical striking rod or bar member 2l extending axially through the bore 2d in the hammer piston and Vhaving at its rear end an integral striking head 29. During forward feeding of the punching mechanism, the hammer piston of the hammering mechanism is adapted to deliver impact blows to the rear annular striking surface of the striking block 22V to drive the punch pin 20 into the drill steelbore, and, upon reversal of the hammering mechanism during punch pin withdrawal, to deliver impact blows to the forward annular striking surface of the striking head 2S to hammer the punch pin out of the steel bore. Formed in the frame 9 with its axis lying in a. vertical plane including the hammer motor axis, and located below the guideways on which the hammering mechanism is guided, is a feed cylinder whose bore ill contains a reciprocatory feed piston 32 having its feed piston rod 33 projecting through the packed rear head of the feed cylinder and secured at 3@ to a depending portion 35 of the rear head block 2d. The forward end of the feed cylinder bore is closed by a threaded plug 36, and formed in the frame@ transversely beneath the feed cylinder bore, substantially midway between the ends of the latter, is a valve bore 3l having mounted therein a rotary control valve 33. Secured to the valve rod of this valve is an operating lever 3Q to which are pivotally connected at iii parallel links Lil, in turn pivotally connected at 2 to a longitudinally slidable operating rod 43. This operating rod is guided Within guiding brackets M, ifi secured to the frame 9, and is formed at its forward end with a grasping handle 135. The rotary control valve 3B is provided with an internal chamber il which communicates with a pressure chamber d8 formed within the frame 9, in turn communicating with any suitable pressure fluid source. The valve chamber il is communicable through a radial valve port i9 with a passage 5u which is connected by a port 5l to a longitudinal passage 52 formed in the frame 9, in turn connected by a conduit 53 with a chamber 54 formed in the rear head block projection 35. The chamber 54 is connected by a passage 55 to an annular chamber formed in the rear head block 2 of the hammer motor. Also communicable with the valve chamber di through radial ports formed in the valve body are reverse and forward feed passages 5l' and 53, the former communicating through a passage 55 with the forward end of the feed cylinder bore, and the latter communicating through a port til with the rear end of the feed cylinder bore.

The fluid distribution means for effecting reciprocation of the hammer piston of the hammering mechanism is of a well known design and motor and communicating through a longitudinal supply passage Biiwith the pressure fluid videdY with a free exhaust passage B1 controlled by the hammer piston. When the control'valve is turned into a position to supply pressure fluid to the port G9, passage Eil, port 5I, longitudinal passage 52, lconduit 53, chamber 54 and passage 55, to the pressure chamber 56, pressure fluid may now through passage 64 and annular recesses 62 and 63, pressure fluid flowing from the former past the reduced exteriorof the hammer piston projection to the rear end of the large bore E5 to act on the rear pressure area of the large piston head i8, and through the latter recess, afterV the piston has moved forwardly, to the rear end of the reduced bore I6 to supplement the pressure coming from the chamber 5S axially of the cylinder and which, though during hammering is somewhat throttled by the head 29, acts constantly on the rear pressure area of the`small piston head I9. At this time the forward end of the cylinder bore i 5 is connected to exhaust through exhaust port 61, and the pressure acting on the rear pressure areas of the hammer piston drives the latter forwardly in its cylinder. Cut-,off to the larger rear area occurs when the head I9 overruns the groove 62.

When the exhaust port 51 is uncovered by the rear edge of the large piston'head I8, the rear end of the bore l5 is connected to exhaust, while the rear edge ofthe small piston head I9 overruns the radial ports of the supply passages 65, 65, thereby admitting pressure fluid from the recess 63 through these passages and ports 66 to the forward end of the large cylinder bore I5, the pressure fluid acting on the large front pressure area of the piston tofdrive the latter rearwardly in its cylinder against the opposing constant pressure acting on the Arear pressure area of the small piston head I9. These operations are rapidly repeated during normal operation of the hammermotor, thereby effecting a rapid hammering action. which is transmitted through the cylindrical punch pin block and bar to the punch pin or to the head 29, depending upon whether hammering in or hammering cut is in progress. By adjusting the control valve 38, pressure'may be supplied either to one end or the other of the feed cylinder, thereby to effect feeding of the punching mechanism either forwardly to drive percussively the punch pin into the drill steel bore, or rearwardly to effect percussive withdrawal of the punch pin from the steel bore.

The improved means for eifecting automatic control of the feed mechanism and for varying the ran-ge of movement of the punching mechanism comprises an upstandingprojection 1U formed integral with the valve operating rod 43 and engageable by a stop plunger 'H mounted in a guide bracket '12, herein formed integral with the rear head block 24 of the hammer motor. The stop plunger 'll is provided with a series of notches 13 with which a positioning pin 14, arranged in a bore in the guide bracket 12, cooperates in the adjustment of therstop plunger. By removing the pin 14 and sliding the stop plunger into different positions, it is evident that the time of engagement of the projection 1I] with the stop plunger may be varied, as desired.

ward pressure area of thefeed piston, and as a Passages 'l5 are provided to conduct lubricant carried in the motor exhausty through port 6.1., to 'the' guideways |0,. lll. and guides I2, l2. guides and guideways may be case hardened t reduce wear. Y f I The operation of the improved punching mechanism will be clearlyapparent from the description given.` When the drill steel 4 is prop- L Y, elly-positioned with respect tozits clamping mechanism'3 and'v stop plate 6, the operator grasps the' handle 45 to push the operating rod, 43 rearwardly, thereby to'rotate, through the links 4l and lever 39, the control valve 38 into a posi-Y tiontosupply motive Vfluid through thev hammer motor supply passages' to thehammer motor cyl- `inder, thereby to effect rapid reciprocation of the hammer piston.V At the same time, pressure fluid is supplied from the valve chamber through passage 58 and port 60 to the rear end of the feed cylinder bore, the pressure iiuid acting on the rear pressure area of the feed piston 32 to feed the hammering mechanism bodily along the frame guideways 10,10. Upon engagement of the point of the punch pin 20 with the drill steel, the cylindrical striking block 22 is held temporarily stationary so that upon vcontinued movement of the hammer mechanismrwith respect thereto this striking block is brought into striking relation with the hammer piston, and as aresult, upon continued forward movement of .the hammering mechanism the punch pin is driven into the rdrill steel bore by the repeated blowsy of the hammer piston against the striking block 22. When the reforming of the drill steel -bore is completed, that is, when the punch pin `has been driven into the drillsteel bore a sufcient distance, -the'stop plunger 1l engages the projection 'IllY of the valve control mechanism, thereby to swing the valve from itsforwar'd feed position to its reverse feed position, while the supply of motive fluid to the hammer cylinder is continued, and as a result the direction of feedV is'automatically reversed. Pressure uid then flows through passages 51,v 59 tothe forward 44end of the feed cylinder b ore to act on the forresult the hammer mechanism is fed rearwardly along the frame guideways. If the punch pin sticks within :the steel bore, the striking block 22 will beheld stationary while the rearward movement of the hammer mechanism continues, thereby bringing` the strikingv head 29 ofthestriking a block rod or bar 21 into a position wherein the rear end of the hammer piston will percussively actuate the same, thereby driving the punch pin Vout of the work witha hammering action. When the punch pin is Withdrawnr fromthe drill steel bore, the operator may operate the control rod 'handle 45 to moverthe control valve into its neutral position, therebygshuttingdown both the hammer motor and feed. As Va resultof this invention, it will be note Y that an improved punching mechanism is provided for reforming the bore of a hollow rock-drill steel subsequent to the drill sharpening process, wherein the punch pin for opening the steel bore is driven into andout of the bore with a hammering action. It will further benoted that by the Y provision of the improved variablelrange Ycontrol mechanism, it is possible .to vary the length of travellof the hammering mechanism and to effect automatic reversal of thedirection of feed when the punch pin has been driven intothe steel bore aV sufficient distance. V.These and other .uses and Y advantages of the improved punchingmechanismV The Will be `clearly apparent to those skilled inthe art. I

f While there is described in this application one form which the invention may assume in practice, it will be understood that this form is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit orv *A the scope of the appended claims.

v v What I claim as new and desire to secure by Letters Patent is: Y Y

' 1. In a Ypunching mechanism, a guide; a harnmer mechanism-mounted on said guide for movement therealong and having reversible hammer- .ing` means for driving with a hammering action a punch pin `into and out of the. work, means for feeding said lhammer mechanism forwardly and rearwardlyalong said guide, means for effecting operation of said hammer mechanism during both forward, and reverse feeding movements thereof, 1

and mechanically actuated means for aut-ornatically reversing the direction of feed when said hammer mechanism has lbeen fed in one direction a predetermined distance including an abutinentimounted exteriorly of and movable with l ysaid hammermechanism, and a reversing control element supported against bodily movement with respect to said guide and having operating means engageable Yand actuated by said abutment.

2. In a punching mechanism, a guide, a reversible punch pin hammer mechanism slidable on said guide and having reversible hammer means for driving the punch pin either forwardly or rearwardly, means for feeding said hammer mechanism forwardly and rearwardly along said guide, means for automatically reversing the direction of feed when said hammer mechanism has been ,-fed in one direction a predetermined ldistance, and associated means for varying the distance of travel of said hammer mechanism.

3In a punching mechanism, a support pro-Y YVidinga guideway, a hammer mechanism mounted on said guideway for movement therealong and having reversible hammering means for hammering a punch pin into and out of a drill steel bore, reversible means for `feeding' Ysaid hammer mechanism forwardly and rearwardly along said guideway, means for effecting operation of said hammer mechanismduring both forward and rearward feeding movements thereof, and mechanically actuated means for automatically reversing said feeding means when said hammer mechanism has driven the punch pin a feeding said hammer mechanism forwardly and rearwardly along said guideway, means for automatically reversing said. feeding means when pin a predetermined distance into the drill steel bore, and associated means for varying the vdistance which the punch pin may be driven'into the drillv steel bore.

5. In a punching mechanism, a support having .a guideway, a hammer mechanism slidable on said guideway for hammering a 'punch pin into said hammer mechanism has driven the punch and out of a drill steel bore, reversible means for feeding said hammer mechanism forwardly and rearwardly along said guideway, means for automatically reversing said feeding means when said hammer mechanism has driven the punch vpin a predetermined distance into the drill steel bore, and associated means for varying the distance which the punch pin may be driven into the drill steel bore, said feed reversing means including a control element for effecting feed reversal and said associated means including a control rod guided on said support, a projection on said control rod and an abutment movable with said hammer mechanism and engagea-ble with said control rod projection.

6. In a punching mechanism, a support having a guideway, a hammer mechanism slidable on said guideway and having reversible hammering means for hammering a punch pin into and out of a drill steel bore, reversible means for feeding said hammer mechanism forwardly and rearwardly along said guideway, means for automatically reversing said feeding means when said hammer mechanism has driven the punch pin a predetermined distance into the drill steel bore, and associated means for varying the distance which the punch pin may be driven into the drill steel bore, said feeding means comprising a feed cylinder containing a feed piston, said reversing means including a reversing Valve for controlling the supply of actuating fluid to the opposite ends of said feed cylinder, and said associated means including an abutment movable with the hammer mechanism and operative upon a predetermined forward feeding movement of said hammer mechanism to effect reversal of said valve.

7. In a punch mechanism, a support having a guideway, a punch pin hammering mechanism slidably mounted on said guideway for driving a punch pin with a direct hammering action into and out of a drill steel bore, reversible feeding means for said hammering mechanism, control means for effecting feed reversal, and operating means for said control means for effecting automatically feed reversal when the punch pin has been driven into the drill steel bore a predetermined distance including a longitudinal rod slidably guided on said support and operatively connected to said control means, and an abutment rod mounted on said hammering mechanism and engageable with said rst mentioned rod.

8. In a punch mechanism, a support having a guideway, a punch pin hammering mechanism slidably mounted on said guideway for driving a punch pin with a direct hammering action into and out of a drill steel bore, reversible feeding means for said hammering mechanism, control means for effecting feed reversal, and operating means for said control means for effecting automatically feed reversal when the punch pin has been driven into the drill steel bore a predetermined distance including a longitudinal rod slidably guided on said support and operatively connected to said control means, an abutment rod mounted on said hammering mechanism and engageable with said first mentioned rod, and means for varying the depth of penetration of the punch pin within the steel bore including adjusting means for said abutment rod, said adjusting means including a series of notches on said abutment rod and a stop pin engagea'ble with said notches to hold said rod in adjusted position, said abutment rod being slidable axially into different positions to engage said first mentioned rod at different times.

9. In a punching Y mechanism, a reversible punch pin hammer mechanism having reversible hammering means for percussively actuating the punch pin to drive the latter either forwardly or rearwardly, means for feeding said hammer mechanism forwardly and rearwardly to move the punch pin toward and from the work during the permissive-action thereon, means for automatically reversing the direction ofY feed when said hammer mechanism has been fed toward the work a predetermined distance, and means incorporated in said automatic means for varying the distance of travel of said hammer mechanism toward the work.

10. In a punching mechanism, a hammer mechanism having reversible hammering means for hammering a punch pin into and out of a drill steel bore, reversible means for feeding said hammer mechanism forwardly and rearwardly to move the punch pin toward and from the drill steel during the hammering action thereon, means for effecting operation of said hammer mechanism during forward and rearward feeding movements thereof, and mechanically actuated means for automatically reversing said feeding means when said hammer mechanism has driven the punch pin a predetermined distance into Ythe drill steel bore including an abutment mounted exteriorly of and movable withV said hammer mechanism and a movable reverse-effecting vcontrol element relative to which said hammer mechanism is bodily movable, said control element engageable and actuated by said movable abutment.

11. In a punching mechanism, a hammer mechanism having reversible hammering means for hammering a punch pin into and out of a drill steel bore, reversible means for feeding said hammer mechanism forwardlyrand rearwardly to move the punch pin toward and from the drill steel during' the hammering Vaction thereon, means for effecting operation of said hammer mechanism during forward and rearward feeding movements thereof, means for automatically reversing Vsaid feeding means when said hammer mechanism has driven the punch pin a predetermined distance into the drill steel bore, and means associated with said automatic means for varying the distance which the punch pin may be driven into the drill steel bore.

Y12. In a punching mechanism, a support providing a guideway, a hammering mechanism mounted on said guideway for movement therealong, reversible means for moving said hammering mechanism forwardly and rearwardly along saidv guideway, means for automatically reversing 'said feeding means when said hammering mechanism has moved along said guideway a predetermined distance in one direction, and associated means for varying the distance of movement in said direction including a control element on said support, for. effecting feed reversal, said hammering mechanism movable bodily relative to said control element, a control rod supported for axial movement on said support, a projection on said control rod, and an adjustable abutment mounted exteriorly of and movable with said hammering mechanism and engageable with said control rod projection for axially moving said control rod.

13. In a punching mechanism, a support pro- Y viding a guideway, a punch pin, hammering mechanism mounted on said guideway for movement therealong, reversible Vfeeding means for said. hammering mechanism for moving the latter forwardly and rearwardly along said guideway, control means for effecting feed reversal,

manual operating means for saidl control means including a longitudinal controlrod supported for operating means for said lcontrol means for effecting automatic feed reversal when.v said ham-4 mering mechanism has moved along said guideway in one direction arpredetermined distance including said longitudinal control rod, and an abutment vrod supported by said' hammering mechanism and engageable with said first mentioned rod for axially moving the latter.'

14.'In a punching mechanism, a support providingv a guidew'ay, a punch pin, hammering mechanism mounted onV said guideway for movement therealong, reversible feeding. means for said hammering mechanism for moving the latter forwardly and rearwardly along said guide- Way, control means for effecting feed reversal, and operating means for said control means for effecting automatic feed reversal when said hammeringA mechanism has moved alongpsaid guide- Way in one direction a'predetermined distance l'including a longitudinal control rod supported for axial movement on said support and operatively connectedto said control means, an abutment rod supported by said hammering mechanism and engageable with said rst mentioned rod for axially moving the latter, and means for varying the depth of penetration of the punch pin with# in the steel bore including adjusting means for said abutment rod, said adjusting means including a series 4of notches on said abutment rod and aV stoppin engageable with said notches to hold said rod in adjusted position, said abutment rod being movable axially into different positions to engage said first mentioned rod at different times.

PAUL H. NAST.

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