US1650411A - Punching machine - Google Patents

Punching machine Download PDF

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Publication number
US1650411A
US1650411A US60027A US6002725A US1650411A US 1650411 A US1650411 A US 1650411A US 60027 A US60027 A US 60027A US 6002725 A US6002725 A US 6002725A US 1650411 A US1650411 A US 1650411A
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tool
power driven
plunger
engagement
lever
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US60027A
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Arthur T Yates
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Buffalo Forge Co
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Buffalo Forge Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/02Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/04Centering the work; Positioning the tools
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8696Means to change datum plane of tool or tool presser stroke
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8759With means to connect or disconnect tool and its drive
    • Y10T83/8761Continuously moving drive means [e.g., "gag"]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8759With means to connect or disconnect tool and its drive
    • Y10T83/8761Continuously moving drive means [e.g., "gag"]
    • Y10T83/8762Hand actuated connecting means

Description

Nov. 22, 1927. 1,650,411 r A. T. YATES PUNGHING MACHINE Filed Oct. 2. 1925 2 Sheets-Sheet l Nov. 22, 1927.
r gm 1 2a 33" A. T. YATES PUNCHING MACHINE Filed Oct. 2. 1925 2 Sheets-Sheet 2 Nov. 2?}, W27.
hearse stares anrnznn T. YATES, or ennnnnvrnnn, new YORK, Assrcnvon TO no PANY, or BUFFALO, NEW YORK.
rear orr cscj runonmo Macrame.
Application filed October 2, 1925. Serial No. 60,027.
This invention relates to punching mas e J. chines, or torming, or blanking presses or the kind in which a reciprocatory member is actuated by power driven means to force a punch or tool toward or through the" work, and more particularlyto machines or presses of this kind in which the punchfor thepa'rt c *ying the same maybe disconnected from its power driven means to enable the punch to he accurately positioned with referenceto the work.
The objects of this invention are to provide a machine of this kind of improved construction which is so organized that the punch head or plungermay hemoved toward and from the work and connected with the power driven means with the use ot-only one hand, the other hand being thus left free to use in positioning the work; also to provide a machine otthis kind with friction means for counterha-lancing the weight of the plunge or head, soythat theplunger'will remain in any position" in which itvmay he set; alsoto provide a machine of this kind with adjustable means for disengaging the punch from its power drivenmeans at different positions of the stroke of the plunger, so that the stroke of the plunger orhead may be decreased when the machine isused' on thin material; also to provide ania'chine or" this kind which isso constructed that the, power driven ram may be connected with the plunger regardless of the position of the plunger in its path of movement; also to provide means for forming a connection between the ram and the head whichconnection will not raise the plunger or head until. the down stroke of the plungel' completed' also to so construct the connection plunrza; also to improve the 'constructicnof between the ram and the head that this con-- machines of this kind in other respects hereinafter specified. i i
In the accompanying drawings, Fig. -1 is alongitudinal central sectionalelevation of the front end of-a punchingmachine embodying'myinvention, Fig. 2 is a similar central sectional elevation thereof showing some of the parts in different position. V
-Fig. 3 is asectional lines-23, Fig. 1.
Fig. 4 is a fragmentary sectional elevation thereof on an, enlarged scale on line 4t l, Fig. 3. V
Fig. 5 is a -i:'ragmentary longitudinal central sectional elevation thereof similar to- Figs. 1 and 2 and showing some of the parts in another position. 1
Fig. 6 is a fragmentary front elevation thereof, partly broken away. 1
Fig.7 is a fragmentarylongitudinalsec tional elevation thereof on line 7-}7', Fig. 6. Fig. 8 is a fragmentary side elevation thereof. I r
plan view thereof on Fig. '9 is a sectional elevation thereof on line9,-9, Fig. 3, on an enlargedscale F 1g. 101s a fragmentary sectional elevationthereof on line 1010, Fig. 5.
The accompanying drawings illustrate one embodiment of my invention applied to a punching machine for punching holes in metal or other work; but it will be understood that it is not intended to limit my in vention to use only: in connection with punching machines, since the same can be used on various" kinds of presses, such as blanking or forming presses, or shearing machines, and the words punching machine? as used in the specification and claims, is intended to include such presses plicable; i v p 'A' represents the punch orother tool,- and B thedie with whichthe tool A cooperates orinto which the punch enters after passing and machines to which this invention is apthrough the work X, which may be-pos1- tionedupon the die B. '6 represents the frame of the punching machine and D the usual rocker arm, which is pivoted at E on the framenGtof the machine. Thefdrive FFALQ FORGE cor/rmeans for imparting an oscillating motion to the rocker arm D are not shown, since these means may be of any suitable construction. All the parts so far described are commonly used in connection with punching machines. and of themselves constitute no part of this invention.
represents a guide or bearing member secured on the front part of the frame C of the machine, which frame may include two substantially parallel upright plates, as shown in Fig. 3, to which the guide or l )earing member 15 is secured by means of bolts 16 or other suitable means, which extend through the two plates of the frame of the machine, and a rearwardly extending part 17 entering between the two plates of the frame C. The guide member also has forwardly extending upright bearing flanges or walls 18 which are spacediapart, and a front wall or plate 19, suitably bolted or otherwisesecured to the front faces of the bearing flanges or walls 18 of the guide member.
The punch or'tool A is secured to the lower end of a reciprocatory tool carrying head or plunger 20, which is guided in its vertical movement by the front, side and rear walls of the guide member 15, the plunger or head as shown being of substantially U- shaped construction, including a pair of upwardly, extending arms or parts 21, connected at their lower ends by-the'portion of the head or plunger 20 on which the tool or punch A is removably held. 22 represents a wear plate or shim interposed between one of the upright ar1ns'21 and the side wall 18 ofthe bearing block 15, and 23 represents a bearing or thrust block interposed between the upright arms 21 of the plunger or head and resting upon a horizontal face extending between the upright'arins 21, and the bearing block 23 being held in place by means of screws or bolts 21 extending through the upright-arms 21 and from opposite sides of the plunger or head and engaging the opposite sides of the bearing block 23.
Reciprocatory movement in opposite directions is imparted .to the plunger or head 20 by means .of a power driven member or ram 27, which is pivotally mounted on the rocker arm D at the upper end of the rain, and receives power therefrom, and which is adapted to move into and out of engagement with the tool carrying head or plunger. In the particular construction shown, the lower end of the power driven member or ram i; adapted to seat on a rounded face 28 of the hearing or thrust block 23 of the tool carrying head 20. In the'embodimentot' the invention shown in the drawings, the am is pivoted at its upper and on the forward end of the rocker arm D, a pivot or pin 29 'beingemployed for this purpose which extends through two flanges 30 of the rocker arm D, and the upper end of the ram bears against a bearing block 31 secured on the rocker arm D between the flanges 30 thereof. It will be understood that the rocker arm D is oscillated continuously through the medium of a motor or other source of power, and thus imparts lengthwise movement to the ram 27, which movement, however, is only imparted to the tool carrying head or plunger 20 when the ram is in engagement with the bearing block 23 thereof, and when the rocker arm is not thus in engagement with theplunger, the ram is adapted to mov:
lengthwise in a space or recess 32 formed in the rear portion of the guide member '15. The ram occupies a position between the upright arms 21 of the plunger or head 20.
The ram may be held out of engagement with the plunger or head 21 by means of a ratchet or detent link or latch 35, pivoted at 35 in a recess in the front face of the ram and having a notch 36 near its other end which is adapted to engage with a detent or latch holding plate or member 37 secured on the front wall. or plate 19 of the guide member 15, the plate 37 extending across an opening 38 in the front wall 19 of the guide member. Thus when the notch of the detent link is in engagement with the ratchet plate 37 as'shown in Figs. 2 and 5, the ram 27 is held out of engagement with the plunger and reciprocates in the recessed portion 32 of the guide member, the detent link 3:) swinging about its connection with the holding plate 37 during this movement of the ram. When, however, the detent lever is released from its connection with the holding plate 37, the ram is yieldingly moved into engagement with the tool carrying member by any suitable means. such, for example, as a spring 35), which in the construction shown is in the form of a leaf springsecurcd at one end to the hearing or wear block 31 of the rocker arm D, and the other, or free end of which bears against the rearface of the ram 27, and thus moves the ram into its operative position shown in Fig; 1 when the detent link 35 is released from its holding plate 37.
It is desirable after each operating stroke of the plunger '20 that the ram be moved automatically into inoperative position in which the link engages the plate 37, so that when this link is disengaged from its hi'rlding place, the machine will actuate the punch A only once. In the particular construction shown for this purpose, the ram 27 is provided with a projecting part or knock-out pin 42 which may be formed integral with the ram 27 or which may, as shown in the drawings, be formed of a separate part secured in a hole in the ram 27 and extending forwardly therefrom. The upper face of the knock-out pin 42 is adaptintent-1 ed to engagewith a projection or part on a fixed part of the machine, for example,
*ith the rearwardly projecting end ota knock-out lever (l3, which is pivoted at el l on the upper portion of the front plate or wall 19 or the side member. 7 The forwardly extending arm ofthe knock-out lever is preferably,though not necessarily, made to cooperate with adjusting nieanswhereby the rearwardly extending knock-out projection ofthe lever 43 may be raised or low.- ered' to controlthe releasing of the M11112? from the plunger at the desired part of the stroke of the plunger. In; the particular construction shown,the forward end; of the knock-out lever 43 bears against an adjust able screw 46 suitably adjustably secured in a forwardly extending projection 47 of'the front wall or plate 19 of the guide member. In the operation of the knock-out mechanism, Fig. 1 shows the knock-outprojection 41-2 and lever 43 in engagement, the plunger having reached the upper limit of its stroke. Upon further upward movement of the rain 27, the knockout projections 42 and 43 engage and cause the-ram to swing into the position shown in Fig. 2, against the action of the spring 39. The swinging back of the ram 27 also causes the notched pore tion 36 of the detent link to engage the holding plate 317.
In order to cause the power oriven in her or rain 27 to raise the tool carrying 11 i d or plunger 20 after completing the donnward stroke, suitable resilient means are pro wided on therein which engage with par is on the plunger only when the rain is properly seated on the plunger. hese means may he of any suitable or desired construction and may he organized as follows:
The rain 27 is provided at eachlside with an upwardly extending arm 50, the two arms being secured on a pin or shaft 51 pivoted, or journalled on the rain. The upwardly extending arms 21 of the plunger or head 20 are provided with recessed portions 52 into which the upwardlyextending ariins SOare adapted to enter, and in which the arms are adapted to engage with parts of the plunger or head, for example, set screws may be secured in the upper ends of the arms 21' of the plunger, the set screws extending downwardly into the recesses and are adapted to be engaged by the upper ends of the arms 50. the set screws 53 being adjustable vertically in virtue of their threadeden; gageinent with the arms of the plunger, and are held in their adjusted positions by means of lock nuts 54, see Fi s. 6 and 7 T he arms 50 may be resiliently held in t1 upright or operativepositions by any suitable or desired means. In the particular construction shown for this purpose, a pinor projection 56 is arranged on the shaft 5]. and extends rearwardly therefrom through a re great accuracy on cess 57 in the rear faceof the rain 27, and
j the outerendofi this pin 56*is connected with one end of the spring 58, and other end of which connected to, a pin 59 secured on the ram 27.- The spring 58 normally draws the pin 56 intoa position against a stop face Q0 of the recess 57, and when the pin 56 is r u; engagement with the stop face 60, thelitt-v in whicl itcanoperatively seat on the hear- 111g lace 28 or the. plunger or head, the yieldlllg lllltll1g. Ll'lll3 50 will permit thespring 6S) toinove the rain toward its opera tron, the litting arins being. moved oaclo wardly against the action or the spring 58, by the engugen'ient with the sides oi the set screws 53 orother parts of the plunger, and as soon as the rain seats on the bearing plate 23 or the plungeiy tlie lifting illlllS 50 will be quickly moved by the spring into their operative positions under the. set screws 53, and when the rain begins ment, the. lifting arms engaging the set screws 53 raise theplunger until the knockout project-ion or pin 42 engages the rear cxtension of the'lrnoclr out lever 43, whereupon the rain 27 willbeswung rearwardly during which movement. the upper ends of the lifting arms 50 slide out of engagement with the ends of the set screws 53. .By providing set screws withwhich the upper ends of the lifting arms engage, this'partot the machine can be readily adjusted so that the engage a head can be properly timed.
ment of the liitin arms with the plunger or l The construction of the punching machine described makes it possibleto lower and raise the tool carrying head or plunger 20 toward and from of engagement therewith, so that an accu rate positioning of the punch with reference to, the work can hesecured. For example, in the punching of rivet holes in structural steel, it will he obviouswthat in corresponding parts must be accurately centered, since otherwise the holes in two parts will not register, and in order to make it possible to curacy the plunger 20 can be lowered bv hand, while the ram is out oi engagement therewith. so that the central projection or tip (lot the punch Aycan be positioned with other mark on the work X, and by means of ny construction, the head or plunger remains in this position until engaged by the ram during its downward movement to punch through'theworls order to obtain these 3y providing its upward lllOVG-m the work, while the rain 22? is out the rivet holes punch holes with, extreme aca prick punch hole or too spring. This enough to overcome results, I have provided frictional means for supporting the plunger or head 20 in any'adjusted position, and also an adjusting device whereby the plunger or head may be moved against the frictional holding means to position the same correctly with reference to the work. As a result of these frictional means, the plunger or head 20 will remain in such position until engaged by the ram. Frictional means of any suitable kind may be employed for holding the plunger or head in this position, those shown in the particular construction illustrated being organized as follows: 1
In order to hold the head or plunger in any desired position, by means of friction, the friction is applied to a drum arranged on one side of the guide member 15, which drum is mounted on a shaft 66 journalled in a guide member 15, and having a pinion at one end thereof which engages with a rack 68 formed in or secured to one of the upwardly extending legs 21 of the plunger, see particularly Figs. 3 and 7. Friction may be applied to the drum.65 by any suitable means, such, for example, as a brake band 70 which extends around the drum 65, brake material or lining 71 being shown interposed between the band 70 and the drum 65. The ends of the band 70 terminate in proximity to each other, one end of the band being fastened to a pin 72 secured in a side wall of the guide member 15 or other fixed part of the machine, and the other end of the brake band being acted upon by means of a spring 73 arranged around a bolt 74 extending through holes in two ends of the brake drum, and an adjustable nut or collar 75 on the bolt 74 may be used for regulating the force exerted by the force is preferably just the weight of the plunger and the parts mounted thereon. Any
.other means for fri'ctionally holding the plunger in any position in which it is set may be employed.
The adjusting of the plunger to position the same relatively to the work is preferably also effected through the medium of the shafttiti, pinion 67 and rack (38 and for this purpose a second drum is secured on the shaft 66, and a clamping lever 81 is provided with a substantially circular split portion 82 surrounding the drum 80. The free end of the split portioh or clamping member 82 of the lever 81 is connected with a tension member or link 83, which may be pivotally secured to a lug 84 extending outwardly from the free end of the clamping band or part .82 of the lever 81, and the upper end of the tension member 83 is preferably pivoted at 85-to a finger lever 86 pivoted at 87 on the lever 81. Consequently, when an operator grasps the end of the lever 81, his fingers encircle the finger lever 86 and by pressing this lever toward the end of the lever 81, tension will be applied to the member 83 which will cause the split portion or clamping member 82 of the lever to grip or clamp the drum 80. Consequently, when the lever 81 is in gripping engagement with the drum 80, the swinging of the lever will cause a turning of the shaft (36 against the friction afforded by the brake band 70, so that the plunger may be moved into its desired position relatively to the work. Other means for positioning the plunger against the action of the friction means acting on the plunger may be employed.
7 As soon as the plunger has thus been accurately positioned relatively to the work, the rain retaining link 35 may be moved out of its retaining position to permit the ram to move the plunger through the work. in order to facilitate the operation of the machine, I have provided means whereby the lever 81 can be used for releasing the ram after the plunger has been set into the desired position, and these'means may, for example, be constructed as follows :-A detent releasing or trip lever 88 is pivoted at 89 on one of the side walls 18 of the bearing member 15 for the plunger, the lever extendinir through a recess 92 in the rear face of front plate 19 of the guide member 15. One end of this lever extends underneath the holding or detent link 35, preferably in rear of the detent plate 37, as is clearly shown in Figs. 1, 2 and 5, and the other end of the lever extends into the path of movement of the lever 81 about the axis of the shaft- 66. Consequently, by swinging the lever 81 downward- 1y into theposition shown in dotted lines in Fig. 8, the end of the trip lever 88 is engaged by the hand lever 81, causing the trip lever to swing about its pivot 89, so that the other end of the lever arranged underneath the link 35 is raised to disengage the holding link 35 from its detcnt plate 37, and. thus permit the rain to seat in the plunger. This construction is particularly desirable because it facilitates the operation of the machine, since the operator, by clamping the lever 81 to its drum 80, can move the lever forwardly to adjust the plunger relatively to the work, and when this has been done, the operator relieve; the tension on the linger lever 86, and continues the forward movement of the hand lever 81 until this lever strikes the end of the trip lever 88, thus releasing the ram from its inoperative position. Since the longer end of the lever 88 lies below the detent link the lever 88 will fall by gravity into the inoperative position shown in full lines in Fig. 6.
During the use of the machine, the operator may adjust the punch with reference to the work, and then move the hand lever 81 into engagement with the trip lever 88 at any portion of the stroke of the rain or loJ power drivenineniber, and the inaehineisso organized that the power driven n cnnber. vzll not raise the plunger fronrits ad usted position, even though the ram may 3e naposition below that at which it can seat on i the bearing plate 23 when the trip lever is actuated. Any suitable means may be employed for keeping the rain out of engagement with the tool carrying member until the downward stroke of the rain. .in the construction shown, the rain is provided with an inclined. or beveled face 90 which is adapted to engage a correspondingly beveled face 91 on the bearing block 23 than ing the upward stroke of. the ltll'l1,.tl!1(;lll'l6 lower extremity of tl' e rainjis rounded as shown at 93, and is adapted to fitinto the correspondingly rounded portion28 ofthe bearing bloelr23, which rounded face terminates in a projection .94 on the wear block which extends somewhat abovethe lowestportion of the seat- 28 in the bearing block. Consequently, by means of the-engagement of the beveled faces 90 andQl, respectively, of the rain and bearing block ofthe plunger, and of the rounded lower face 9230f the rain with the upwardly {extending projection 94 of the bearingbloch, theupwardly extend ing arms of the rain will'be kept out of engagement with the set screws 53. In order to furtherinsure against lifting of the head or plunger by the ra n during the upward stroke thereof before the ram is properly seated in the plungenthefront face or edge of each of the upwardly.extending arms 50 is, preferably rounded or beveled as shown at 95, and the portions of. the sides 21 of the head or plunger which extend over the recess 52 therein, are also provided with bevelled faces 96, see particularly'Fig. Consequently,when the rounded or beveled faces 9-5 of-the arms strike eitherthe set screws or the beveled face 96' of the sides 0-. the plunger, the upwardly extended lifting arms 50 of the ram will be pushed back wardly against the action of the springfotl, so that no raising of theplunger results. Howe er, when the rain moves downwardly, the li Lug-arms 50 can readily yield against the action of the spring 58 and permit the rain to enter into its seated position in which the rounded lower face thereof engages the 28 of the bearing plate at which time the lifting arms 50 will also snap forwardly into their operative positions to cooperate with the set screws 53 to raise the plunger.
-Means are preferably provided whereby the lever 81 will be swun out of the osi- 5"! tion shown in dotted lines in Fig. 8, after this lever is released by. the operator, and for this purpose a plunger 97 is arranged in a hole or recess in the lever. 81, see particularly Fig. 9, which plunger ispressed into enga ement with the drum 80 by means of the spring 98. Ti -here isjust enough fric-' through the bumpers or after shearing of the metal is effected the resistance oftered byjthe bumpers or the"pperator to swing with the drum, and,
consequently, upon the upward movement of theheador plunger. 21, the rack 68 causes the pinion. 67 to rotate the shaft 66 in a direction opposite to that in which the shaft is turned for adjusting the plunger, and this movement of the shaft 66 causes the lever 81 to be returned toits upright position as shown in full lines in Fig. 8, whereupon the Sameis ready to, be again actuated bythe operator, This plunger 97 also moves the hand lever 81 positively out of engagement with the trip detent link 35 to function after each operation of the machine. 7 Q r VVhen my invention is applied to a ma or sheared, after sheared the work, the last portion of the downward stroke of the punclrfrequently resultsfin a sudden jerkingof the plunger downwardly after the resistance ofv the work has ceased, this being particularly true when almaehine is used in connection with hard metal. In order to, prevent this downward jerking of the plunger, shock absorbersjor bumpers are employed, which yieldingly oppose the, movement of the plunger, justas the punch shears the metal. In the construction shown for this purpose, a pair of shock absorbers 99 are providedwhich may be made of rubber or other resilient material, andwhich in theconstruction shown rest on the upper surface of a shelf or ledge 100 secured to the, upper edge of one of the side walls, 18 'ofthe plunger guide, the ledge or shelf 100 being secured toithe side walls 18 by means of bolts 101,01 the like. The inner portion of the shelf or ledge 100 extends over one of the sides 21 of the head or plunger, and rods 102 secured at their lower ends in one of the sides 21 ofthe head or plunger extend through the ledge 100*and shock absorbers 99 and are provided at their upper ends with suitablestops, such, for example, as a pair of lock nuts 103, which are so positioned thatithey engage the upper ends of the bumpersor shock absorbers 99 just'as the punch has sheared then etal. Consequently,
further downward movement of, the punch a gainst shock absorbers 99, and the nuts 103 are ad ustable so that-they can be correctly posie tioned with referencetdthe bumpers or shock absorbers. p, y 1
Means are also preferably employed for limiting the upward movement of the head or plunger. 20, this head israised to a point beyond that at whiclrthe lower end ofthe ram Q'Fmay seat on thebearingblock 23 of the head or lever 88, thus permittinggthe since it willbe obvious-that if the punch or-tool 11215 plunger, the ra n will not be able to effect downward movement of the plunger. In order to limit this movement a stop bolt or screw 105 is provided in the ledge or shelf 100, the stop screw preferably engaging in a threaded hole in the shelf 100, and a lock nut 106 securely holds the screw in its adjusted position. The lower end of this screw is adapted to engage the upper end of one of the upwardly extending arms 21 of the head or plunger, and this screw is also adjustable so that the upper limit of the movement of the head or plunger can be accurately controlled as desired."
In'the operation of the punching machine described, the operator places the work X on the die B and then grasps the hand lever 81 and finger lever 86, pressing the finger lever toward the hand lever to clamp the hand lever on the drum 80. Upon drawing thevhand lever forwardly, the drum and shaft 66 will be turned causing the pinion 67 to cooperate with the rack 68 to move the tool earrying member 20 downwardly, and at the same time the vtip a of the punch is accurately positioned with reference to the work X. When this has been done, the finger lever 86 is released to permit the hand lever to be turned about the drum 80 without turning. the drum, and the hand lever 81 is pulled forwardly to strike the trip lever 88 which raises the latch or detent link 35 out of engagement with the holding plate 37, and-permits the spring 39 to move the ram 27 forwardly; This forward movement ofithe ram during the downward stroke thereof will cause the same to seat on the plunger or head as shown in Fig. 1, whereupon the continued downward movement of the ram will force the plunger downwardly and the punch A through the work. Upon the upward or return stroke of the ram, the arms thereof will engage the set screws 53 and raise the head or plunger until. the knockout projection 42 of the ram engages the rearwardly projecting portion of the lever 43, whereupon the ram will be swung about its pivot 29 out of its operative connection with the head or plunger and the notched portion 36 of the detent link 35 willagain engage the holding plate 36, so that only one working stroke of the tool carrying head results from the releasing of the detent lever, and the machine is then ready to be again actuated. The operator, after having pressed the hand lever 81 into engagement with the trip lever 88, releases the hand lever, and theifriction of the plunger 97 in the hand lever 81 hearing on the drum 80 will cause the hand lever again to swing into its upper or upright position during the upward stroke of the head or plunger 20, so that the machine is'ready for the next operation. If the trip lever is actuated during the time that the ram 27 isbelow its seating position with reference to the plunger or head, the ram will move upwardly without raising the head 20, as has been described, and consequently, the tool or punch A will not be moved out of the position into which it has been set.
The machine described has the advantage that the tool carrying head, aftcr having been set into its correct position, will be positively held in this position by the friction drum and band 70, and the desired friction can be very quickly adjusted by merely adjusting the tension of the spring 73. Furthermore, the adjusting of the punch with reference to the work and the actuating of the trip lever to start the operation of the machine can be done by practically a continuation of the same movement of one hand of the operator, leaving the other hand free to position or hold the work. The mechanism is so constructed that none of the parts are subject to excessive wear, and those parts which are subject to wear are made adjustable, so that any wearing of these parts can be readily compensated for. Also by adjusting the knock-out lever 43, the machine may be controlled so that a knocking out of the ram takes place at different portions of the stroke of the tool carrying head. For example, when working on thin metal, the knock-out lever 48 can be adjusted so that the punch is raised only a slight distance above the metal, thus requiring very little downward movement of the tool carrying head by means of the hand lever 81, and when working on thicker metal, an upward adjustment of the rearward projection of the knock-out lever 43 can be made. The shock absorber or bumpers 99 save much of the wear and tear on the machine in that they cushion or yieldingly rcsist further downward movement. of the plunger at the time that. the metal is sheared.
I claim as my invention 1. A punching machine including a reciprocatory tool carrying head, a power driven member adapted to be connected with and disconnected from said head to impart movement thereto, and frictional means for bolding said head in diii'erent set positions when disconnected from said power driven member.
2. A punching machine including a reciprocatory tool carrying head, a power driven member adapted to be connected with said head to impart movement thereto and to be disconnected from said head, frictional means for holding said head in different set positions when disconnected from said power driven member, and hand operated means for moving said head against the action of said friction means.
A punching machine including a reciprocatory too]. carrying head, a power driven member adapted to be connected with said head to impart movement thereto, and. ad jnstable friction means adapted to counterbalance the weight of said, head when dis: connected from said powerdriven member.
4-. it punching machine includinga reciprm'ratory tooi carry ii'ig head, a power driven member adapted to be connected with. said head to impart movement thereto, frictional means for holding said head in different set positions when disconnected from saidpower driven member, means for adjusting said fractional means to vary the extent to which these. 7 its movement of, said head, and hand. operated means for movingsaid head against the actioirof said frictional means when said head is disconnected from said power driven member,
5. The combinationof a reciprocatory tool carrying member, a power driven .member adapted to be connected with said tool carrying member, and a friction drumwhich is rotated when said tool carrying member is reciprocated and which holds said tool carrying member in any position in which the "et when disconnected from said power driven member.
G. The combination'of a reciprocatory tool carrying member, a power driven member adapted to be connected with said tool carrymember, a drum wiich is rotated when '1. tool carrying member is reciprocated, =nd fri counterbalance the inn member.
7. The combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with said tool carrying member, a friction drum which is r0 tated when said tool carrying member is reciprocated and which holdssaid tool carry inn" n'iember in any position in which the same is set when disconnected from said power driven men'ibeiyand means for turn;
inc; said friction drum against the friction,
to vary the "iber. l i v H he combination of a reciprocatory tool carry member, a power driven. n'iember adapted tobo c-onnectedwith said tool carryin member, a friction drum which .is ro in e-i' when said tool carrying member is .reciprecatedand which holds said tool carry,-
position of said tool carrying in inc-beiin any position inlwhich the same set when disconnected from said power driven member, and a clamping memb adapted to reieasably engage apart connected with said friction'drnm to turn the same for adjusting sai toolcarrying neme ber relatively to the work.
9. The combination of a reciprocatory tool carrying member, a power 'drivenmember a pted to be connectec iember, a friction drum connected with ea c tool carrying member andjrotatedb'y the reciprocatcry movement of said tool .WlllCl'l said t mg lever adapted ,to be moved intoh'olding ion means acting on said drum to weight of said tool carry-' bar, a pinion engaging said rack,
with said tool carry in which the same is set when, disconnected from said power drivenmember, a shaftcn lrum is mounted, and a clamp engagement with said shaii't for turning said .ill'itjtiOll drum to ad ustsaid tool carrying member.
10. 'ihe combination of a reciprocatory tool carrying member, power driven member adapted to be connected with and disconnected from said tool carrying member, a rack movable with said tool carrying men1- her, a pinion engaging said rack, and frietion means cooperating with said pinion to support thetool carrying member in any position in which the same is set when dis connected from said power driven member.
11. The combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with and disconnected from said tool carrying member, a rack movable with b er, a pinion engaging said rack, friction means cooperating with said pinion to snp port the too carrying member in any position in which the same is set when discon means connected with said pinion for turning the same against the action of said friction means to adjust the tool carrying member relatively to the work. 12. The combination of a reciprocatory toolcarrying member, a. power driven member adapted to be connected with and disconnected from said tool carrying member, a, rack movable with said tool carrying memfriction to sup- 'nected from said power. driven member, and
means cooperating with said pinion port the tool carrying member in anyyposi- [SCOH- I tion in which'the same is setwhen nected from sald power driven member, a shaft onwhlch said. pinion is mounted, a
friction drum mounted on said shaft for hold1hg said tool carrymgmember in any position in which the same set when disconnected from said power driven member, and clamping means adapted to engage said shaft forturningthe same against the action of said friction drum to adjust said tool carrying member. y i
18. The combination of a reciprocatory tool carrying member, a power driven "member adaptedto be connected with said tool carryingmember, friction means for bold ing said tool carrying member in any position in which the same is set when disconnect-ed from said power driven member,v a rotary member connectednvith said tool carrying member and on which said friction means are mounted, "a, clamping lever adapted to clamp said rotary member for'adjusting the position of said tool carrying memher, and a frictional connection between said saidtool carrying memclamping lever and said rotary .member whereby the movement of said tool carrying member away from the work by said power driven member causes the clamping lever to return to its initial position.
' a 14;. The combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with said tool carrying member, means for holding said.
with said tool carrying member. and means for adjusting said tool carrying member when said power driven member is out of engagement therewith, afrotary member connected with said tool carryingmember, and a lever adapted to engage said rotary memberfor turning the same to adjust said tool carrying member, and adapted to be moved about the axis of said rotary member to releasesaid holding means. I
16. The combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with-said tool carrying member, means opposing the weight of said tool carrying member, means for holding said power driven member out of engagement with said tool carrying member, means including a lever adapted'to be actu ated for adjusting the position of said tool carrying member. saidlever being adapted to be disconnected from said tool carrying member and to be moved into a position to release said holding means to permit saidpower driven member to engage said tool :arrying member. v
17.'The combination of a reciproi'atory tool' carrying member, a. power driven membe' adapted to be connected with said tool carrying member, a rotatable member connected with said tool carrying member and rotated by the reciprocatory movementthereof, a gripping lever adapted to engage said rotary member for turning the same to adjust said tool carrying member, means for holding said power driven member out of engagement with said tool carrying member, said lever being adapted to be'moved into a. position to release'sai'd holding member, and a. frictional engagement between said lever and said rotary member. whereby the movement of saidtool'carrying memberin a direction away from the work causes said rotary member to move said lever into its initial position and out of engagement with said holding means.
18. The combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with and dis connected from said tool carrying member to move the same through a power stroke and a return stroke, and means with which said power driven member moves into engagement at the completion of its return stroke for moving said power driven mem ber out of engagement with said tool carrying member.
19. The combination oi a rccipromtory tool carrying member, a power driven member adapted to be connected with and disconnected from said tool carrying member to move the same through a power stroke and a return stroke, means with which said power driven member moves into engagement at the completion of its return stroke for moving said power driven member out of engagement with said tool carrying member, and a releasable holding member for holding said power driven member out of engagement with said tool carrying member.
20. In a machine of the kind described, the combination of areciprocatory tool carrying member, a power driven member adapted to be connected with and disconnected from said tool carrying member, a tixed part on said machine cooperating with a part on said power driven member for moving said power driven member out of engagen'ient with said tool carrying member after said power driven member has moved said tool carrying member out of engagement with the work and a latch pivoted on said power driven member and adapted to engage a fixed part of the machine for holding said power driven member in its inoperative position.
21. In a machine o'lthekind described, the combination of a rcciprocatory tool carrying member, a. power driven member adapted to be connected with said tool carrying member to move the same through a working stroke and a return stroke, means for yieldingly urging said power driven member into engagement with said tool carrying member, adetent member for normally holding said power driven member out of engagement. with said tool *arrying member and which may be released at will to permit said means to move said power driven member into engagement with said tool carrying member, and cooperating means on said machine and said power driven member to move said power driven member out of engagement with said tool carrying member and to place said detent member into its holding position.
In a machine of the kind described, the combination of a reciprocatory tool'carrying member, a power driven member adapted to be connected with and disconnected'from said tool carryinginember to move said tool carrying member through a workingstroke and a return stroke, and means engaged by a part of said power driven member during its return stroke for moving said power driven member out of engagement withsaid tool carrying member, said means being adjustable to engage said power driven member at diiferent portions of the return stroke power driven member moves out of engagement with said tool carrying member to determine the restthereof.
23. In a machine of the kind described, the
combination of a reciprocatory tool carrying member, a power driven member adapted to be connected with and disconnected from said tool carrying member to move said tool carrying member through a working stroke and a return stroke, a fixed part on said machine and a part on said power driven member which are adapted to engage for moving said power driven member out of engagement with said tool carrying member during the return stroke thereof, and means for adjusting one of saidparts relatively to the other to vary the portion of thereturn v V gaging a fixed part to releasably-hold said "power driven member out ';with said tool carrying member.
stroke at which said power driven member is moved out ofengagement with'said tool carrying member to vary the position of the tool carryingmember with reference to'the a tool carrying member having a base portion work. a a
24. In a machine of the kind described, the combination of a reciprocatory tool carrying member, a pivoted power driven member adapted to swing into and out of engagement with said tool carrying member to move said tool carrying member through" a working stroke and a return stroke, and a part engaged by said power driven member during its return stroke which positively swings said power driven member out of engagement with said tool carrying member to determine the rest position of said tool carrying member. i y
25. In a machine of the kind described,
the combination of a reciprocatory tool' carrying member, a'pivotedpower driven member adapted to swing into and out of engagement with said tool carrying member to move said tool carrying member through a working stroke and a return stroke, a part on said inachineadapted to engage a part of said power driven member durin the return stroke thereof to move said power driven member out of engagement with said tool carrying member, and means for adjusting said part on said machine to cause said power driven member to move out of en gagement with said tool carrying member at different portions of the return stroke thereof to determine the rest position of said tool carrying member. I
26. In a machine of the kind described, the combination of a reciprocatory tool carrying member, pivoted power driven member working stroke and said arms.
adapted to swing into and out of engagement with said tool carrying member to move, said tool carryingmemberthrough a a return stroke, a knock out lever pivoted on a fixed part of the machine and adapted to engage apart ofsaid power driven member to move the same out of engageinentwith said tool carrying member during the return stroke thereof, and means for adjusting said lever to vary the portion of the return stroke at which the position of said tool carrying member. p
'27. The combination of a reciprocatory tool carrying member having a pair of upwardly extending arms spaced apart, a
carrying member for actuating the same when in a position between said arms, and
a holding member extendingbetween said armsnnd pivoted to said power driven member and having a part for positively enof engagement 28. The combination of a reciprocatory and upwardly extending arms spaced apart,
a power driven member adapted to swing nto the space between sa d arms and toseat against the base portion thereof to move holding said parts on said powerdriven member in positionsto engage the parts on 29. The combination of a reciprocatory tool carrying ineniberhaving side portions spaced apart and a connecting base portion, a power driven member adapted to enter be tween said side portions of said tool carrying member and to seat on said base port on, arms on said power driven member adapted to engageparts on the side portions of said tool carrying member when said power 7 driven member is seated on the base portion of the tool carrying member said arms being movable relatively to said power driven member, and yielding means'for normally holding said arms in positions to engagesaid parts on said side portions. Q 1
30. The combination of "a reciprocatory tool carrying member, a powertdrive'n" mem ber means for moving said power driven member into engagement with said tool carrying member, a rigid part on said power driven member engaging with a rigid fixed part for positively moving said power driven member out of engagment with said tool carrying member atter the completion of a working stroke, means for adjusting said tool carrying member relativelyto the work when said power driven member is out of engagement therewith, and means for holdin said power driven member out of engagementwith said tool carrying member except when said power driven member is moving in a direction to move said tool carrying member first in its working stroke. 7 31. The combination of a reciprocat'ory tool carrying member movable through a working stroke and a return stroke, areciprocatory power driven member adapted to be connected with said tool carrying member for actuating the same, means for ad- ,yu sting said tool carrying member relativey to the work when said power driven member is out of engagement therewith, said I power driven member having a part adapt- ,ed to move said tool carrying member through its working stroke and another part adapted to move said tool carrying member through its return stroke, and means for fprevent-ing said other part from engaging said tool carrying member until after the part of said power driven member which moves said tool carrying member through its working stroke has engaged said tool carrying member.
32.The combination of a reciprocatory tool carrying member movable through a working stroke and a return stroke, a reciprocatory power driven'member adapted to be connected with said tool carrying member 'for actuating the same, means for adjusting said tool carrying member relatively to the work when said power driven member is out of engagement] therewith, a part on said power driven member which seats on said tool carrying member to move said tool earrying member through its working stroke,
arms on said power driven member which engage parts of said tool carrying member 'tovmove said tool carrying member through vits return stroke, and means for preventing said arms from engaging said tool carrying member until after the parts of said members which move said tool carrying member through its working stroke are in engagement.
33. The combination of a reciprocatory tool carrying member adapted to move through a working stroke and a return stroke, a reciprocatory power driven member having a'part adapted to be moved into and out of engagement with said tool carrying member and adapted to move the same through its working stroke, parts on said power driven-memben adapted to engage parts on said tool carrying member for moving said tool carry ng member through its return stroke, and means for holding said i last mentioned parts out of engagement unber until the faces said tool carrying member, coo
til after said parts which move saidtool carrying member through its working stroke are in engagement.
3%. The combination of a tool carrying on said power driven member which are adapted to engage parts on said tool carrying member for moving said tool carrying memher through its return stroke, and means for holding said parts on said power driven member out of engagement with the corresaid tool carrying mem sponding parts on of said two members are in engagement.
35. The combination of a tool carrying member movable'through a working stroke and a'return stroke, a power driven member movable into and out of engagement with said tool carrying member, cooperating faces on said power driven member and saidtool carrying member for moving said tool car- 'rying member throughitsworking stroke when said power driven member is'rn engagement with said tool carrying member, and pivoted arms on said power driven member Wlilli are adapted to swing into engagement with cooperating parts on said tool carrying member aiter said faces of said power driven member and tool carrying member are in engagement.
'36. The combination of a tool carrying member movable through a working stroke and a return stroke, a power driven member movable into and out of engagement with )erating faces on said power driven member and said tool carrying member for moving said tool carr 'in member throu h its workin" stroke b O b when said power driven'n'iember in engagement with said tool carrying member, arms pivotally mounted on said power driven member and adapted to engage cooperating parts on said tool carrying member for moving said tool carrying member through its return stroke, and means for yieldingly holding said arms in their operative position, said means permitting said arms to swing out of their operative position until the faces of said power driven member and said'tool carrying member are in engagement.
37. The con'ibinatiou of a tool carrying member movable through a workingstroke and a return stroke, a power driven member movable into and out of engagement with said tool carrying member, cooperating faces on said power driven member-and said tool carrying member for moving said tool carrying member through its working stroke when said power driven member is in engagement with said tool carrying member, adjustable parts on said tool carrying member, and parts on said power driven member adapted to engage said adjustable parts 011 said tool carrying member for mo *ing' said tool carrying member through its return stroke. a
38. The combination of a tool carrying member movable through a working stroke and a return stroke, a power driven member movable into and out of engagement with said tool carrying member, cooperating faces on said power driven member and said tool carryii'ig member for moving said tool carrying member through its working stroke when power driven member is in engagement with said tool carrying member, adjustable parts on said tool carrying memer, pivoted arms on said power driven member, and resilient means tending to move said arms into position to engage the said adjustabl parts on said tool carrying memtln'ough its return stroke.
239. The combination oi a reciprocatory tool carrying member, a power driven member adapted to move into engagement with said reciprocatory member to move the same through a working stroke and a return stroke, means for adjusting said tool carrying member relatively to the work while said power driven member is out of engagement therewith, and inclined cooperating faces on said members which prevent said power driven member from engaging said tool carrying member while said power driven member is moving in the direction of the return stroke. r
4&0. The combination of a reciprocatory tool carrying member, a power driven member movable into a position out of engage ment with said tool carrying member and into engagement with said tool carrying member to actuate the same, a detent link pivoted on said power driven member and adapted to engage a fixed part of the machine to hold said power driven member out of engagement with said tool carrying member, and means for moving said detent link out of its holding position to permit said power driven member to engage said tool carrying member.
ll. The combination, of a reciprocatory tool carrying member, a power driven member movable into a position out of engagement with said tool carrying member and into engagement with said tool carrying member to actuate the same, a detent link pivoted on said power driven member and adapted to engage a fixed part of the machine to hold said power driven member out oer for moving said tool carrying member of engagement with said tool carryingmemmember, and means upon the completion of the return stroke of: said tool carrying member to move said power driven member out of engagement with said tool carrying mem ber and to-return said detent link to its holding position. i
42. The combination of a reciprocatory tool carrying member, a power driven member movable into a position out of engagement with saidtool carrying member and into engagement with said tool carrying member to actuate the same, a detent link pivoted on said power driven member and adapted to engage a fixed part of the machine to hold said power driven member out of engagement with said tool carrying member, means for moving said detent link out of its holding position to permit said power driven member to engage said tool carrying member, means for adjusting said tool carrying member with reference to the work when said power driven member is out of engagement therewith, and a connection between said adjusting means and said detent link for moving said detent link out of its holding position upon the completion of the adjustment, to permit said power driven member to actuate said tool carrying member.
3. The combination of a reciprocatory tool carrying member, a power driven mem-/ ber movable into a position out of engagement with said tool carrying member and into engagement with said tool carrying member to actuate the same, a detent link pivoted on said power driven member and adapted to engage a fixed part of the machine to'hold said power driven member out of engagement with said tool carrying member, means for moving said detent link out of its holding position to permit said power driven member to engage said tool carrying member, means for adjusting said tool carrying member with reference to the work when said power driven member is out of engagement therewith, a connection bet-ween said adjusting means and said detent link for moving said detent link out i of its holding position upon the completion of the adjustment, to permit said power driven member to actuate said tool carrying member, and means upon the completion of the return stroke for moving said power ARTHUR T. YATES.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640541A (en) * 1950-03-15 1953-06-02 Buffalo Forge Co Power stop device for power presses
US2675078A (en) * 1950-03-10 1954-04-13 Teletype Corp High-speed reperforator
US2851888A (en) * 1953-09-22 1958-09-16 Scholin Axel Portable punch press
US2953203A (en) * 1957-02-06 1960-09-20 Ncr Co Perforating apparatus
US2957380A (en) * 1957-08-02 1960-10-25 American Photocopy Equip Co Punch
US3127014A (en) * 1964-03-31 Horizontal metal-tube and extrusion presses
US4907481A (en) * 1987-09-02 1990-03-13 Jim Dvorak Powered press with manual punch and die alignment capability

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127014A (en) * 1964-03-31 Horizontal metal-tube and extrusion presses
US2675078A (en) * 1950-03-10 1954-04-13 Teletype Corp High-speed reperforator
US2640541A (en) * 1950-03-15 1953-06-02 Buffalo Forge Co Power stop device for power presses
US2851888A (en) * 1953-09-22 1958-09-16 Scholin Axel Portable punch press
US2953203A (en) * 1957-02-06 1960-09-20 Ncr Co Perforating apparatus
US2957380A (en) * 1957-08-02 1960-10-25 American Photocopy Equip Co Punch
US4907481A (en) * 1987-09-02 1990-03-13 Jim Dvorak Powered press with manual punch and die alignment capability

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