US2318445A

US2318445A - Method and apparatus for making die rolls

Info

Publication number: US2318445A
Application number: US297861A
Authority: US
Inventors: Wintritz George
Original assignee: Conmar Products Corp
Current assignee: Conmar Products Corp
Priority date: 1939-10-04
Filing date: 1939-10-04
Publication date: 1943-05-04
Anticipated expiration: 1960-05-04

Description

Maly 4, 1943.

G. wlNTRlTz METHOD AND APPARATUS FOR MAKING DIE ROLLS Filed Oct. 4. 1939 Sheets-Shee? 1 l l l I |"T INVENTOR f GEORGE WINTRITZ ATTORNEY May 4, 1943. G. WINTRlTz Y METHOD AND APPARATUS -FOR MAKING DIE ROLLS Filed-06T.. 4, 1939 4 Sheets-Sheet 2 INVENTOR GEORG: WINTRITZ May 4, 1943.- G. WINTRlTz Y r `2,318,445

yIVIETIOD AND APPARATUSl FOR MAKING DIE ROLLS4 y Filed 0m54.195s 4 sheets-sheen( 06 lNvENToR Fig GEORGE WINTFSITZ Patented May 4, 1943 METHOD AND APPARATUS ForN DIE nous MAKING George Wintritz, Staten Island,lN. Y., assigner to Conmar Products Corporation, Bayonne, N. J., a corporation of New Jersey Application October 4, 1939, Serial No. 297,861

23 Slaims.

This invention relates to die rolls, `and more particularly to a method and apparatus for making such die rolls.

Die rolls may be used t'oform a series of impressions along a wire or strip of material. The luse of such rolls makes it possible to form the desired impressions at exceedingly high speeds.,y and with a minimum of cost, compared, for example, to coining the impressions in a reciproaround the periphery of the roll must be equally spacedI and of equal depth. They must be perfectly shaped and absolutely uniform in every respect, so that no one part of the roll periphery can be distinguished from any other part.

Furthermore, I have foundthat even the internal strain of the metal within the roll must be uniform, for after it has been completed, the roll must be hardened. The necessary heat treatment will distort the roll from the desired per fect condition if the internal strains in the metal of the roll are substantially different from one another.

The primary object of my invention is to make it possible to obtain perfect die rolls, .and toprovide a generally improved process and apparatus for making such die rolls. excellent results may be obtained by prelimi- 'narily forming a master punch, the end of Which is negative to one of the impressions to'be formed around the roll. This punch is .mounted in a press and is used to strike the roll in order to form the desired impressions therein. The roll is appropriately mounted, so that it may be rotated an amount equal to the desired spacing between impressions. However, it is not desirable to punch each impression to its full depth either by one or by successive blows at one point on the roll, and to then move the roll to the next I have found that point, for there-#fis resulting distortion in the struck by the master punch for only a., slight depth, whereupon the roll is rotated an amount equal to the desired spacing between impressions,

and again struck to the same slight depth, etc., until the roll has been turned through.acom

lplete revolution. The roll is then struck `by the roll.

master punch to a slightly increased' depth and is intermittently rotated to the successive impressions, each of which is struck to the new slightly increased depth, untilall of the impres- -sions have been struck a second time. This operation is repeated over and over again until the desired final depth is'Areached. Y

I have-found that even with this precaution, there may be a noticeable change or departure from uniformity at the end point, when a single endpoint is maintained, and a further object of my invention is to avoid this difficulty, which I do by carrying the operation at each depth through more than one revolution, or from a diierent viewpoint, by using endpoints, which differ each time, so that the endpoint itself moves relative to the roll. Specically, the initial operation is preferably continued through one revolution, plus one or more .additional impressions, Similarly, the second operation or second depth of the impressions is carried through one revolution plus one or more addi` pressions may not remain in desired position, due to elasticity of the metal in the roll itself; and

perhaps due to elasticityin the pre`ss andl roll mounting, etc. In accordance with a further feature and object of my invention, when 4the final depth is reached, the operation of the punch v is preferably continued at the final depth during at least several extra complete rotations of the The depth of the punch blow at this time may, if desired, be accurately fixed by theprovision of appropriate stop blocks between the relatively movingparts of -the press. This insures that there is no Variation in the terminal position ofdthe punch Aduring the series of repeated corrective or finishing movements against the roll.

The operation as so lfar described would be a rather slow and painstaking one. It might take amachinist approximately a full day to shape a pair of small die rolls in the press, even with the master punch already available. A further object of my invention is to speed up the making of the die rolls, and for this purpose I have devised apparatus provided with appropriate ratchet feed means operated by the press for turning the roll holder through the desired arc between successive operations of the press. A pilot and suitable pilot holes may be provided to insure a/ccuracy. It is obvious that this automatic. rotation of the roll between reclprocations of the press will greatly speed up the operation. In fact, the

press may be operated continuously, and in accordance with a further feature and object of my invention the press may be provided with a counter set to count the number of impressions around the roll, plus one or more additional impressions. If the punch is advanced by hand as,

for example, by very slightly turning the pitman screw of the press, the counter may be arranged to automatically stop the driving motor of the `press after the roll has been treated at each depth, thus affording an opportunity for the operator to advance the punch to a slightly greater depth.

A further object of my invention is to provide fully automatic apparatus for shaping the`die rol1,and for this purpose I provide automatic feed means for the punch, said means functioning to automatically advance the punch a slight amount after the roll has gone a little more than `one revolution. I .further provide automatic stopping means to stop the feed of the punch after it has reached full depth, butat this time the press is not stopped, but instead continues its operation for several more revolutions of the roll so as to fix or set the impressions, all as was previously explained. 'Ihe press is then stopped and the attendant has nothing further to do tha-n to remove the shaped roll; to insert a new roll;

' Fig. 1 is a partially sectioned elevation taken through apparatus embodying features of my invention;

tory of the operation of fully automatic apparatus embodying additional features of my invention. Referring to the drawings, and more particularly to Fig. 4, the invention may be best practiced with the aid of a press which, however, may be of conventional character.` In the present case, the press comprises a body i2 mounted on a supporting frame I4, and carrying a main crank shaft i6, the motion of which may be steadied by means of flywheel I8. The press is driven yby an electric motor which is located on the opposite side and, therefore, is not visiblel in Fig. 4. The. crank shaft operates to reciprocate a slide 20, the latter being connected to the crankby means of a pitman 22 includingr a pitman 'screw 24. In accordance with the presentinvention, a roll holder, generally designated H, is mounted on the bolster or table 26 of the press. I The holder is equipped with ratchet mechanism operated by a rod or link 28 extending upwardly to an auxiliary crank 30 ofadjustable radius. The operations of the ratchet mechanism are preferably counted. as by means of a counter 32, and this is preferably so arranged as to control a contact or switchfor an electric circuit. l

Referring now to Figs. 1, 3 and 11 of the drawings, -a blank roll R is mounted in holder H. The

K Vroll is operated upon by a master punch 34 carried in a holder 36 secured in slide 20 as by means of a conventional cap and cap studs. The punch holderis preferably enlarged at 38 to fix its location relative to the slide.

The'end of punch 34 is shaped negatively to one of the series of` impressions Yitis desired to form around the periphery of the roll R. The roll is centered between cone centers 40 and 42, the

latter being advanced or retracted by a convenl tional crank and' screw or tail-stock mechanism.

Fig. 2 is a schematic wiring diagram for the apparatus;

Fig. 3 shows a part of the apparatus in plan;' Fig. 4 is a side elevation of a pressequipped with the apparatus of my invention;

Figs. 5 and 6 are side and end elevations of a blank roll preparatory to forming impressions therein:

Figs. 7 and 8 are side and end elevations re-y spectivelyoi a finished femaleA roll intended to make slide fastener wire; l

- Figs. 9 and 10 are end and side elevations respectively of a male roll intended to work in mating cooperation with the female roll for the pro-v duction of slide .fastener wire;

Fig. 1l is an end elevation of the ratchet mechanism for the roll holder;

Fig. l2 is a section showing a detail and' is taken inthe plane of the line I2-I2 of Flg..11; Fig.13 is an end elevation of the roll holder and punch mechanism looking at the end opposite. that shown in Fig. 11, fromfthe piane of the line I3-i3 of Fig. 1;

, Fig.`14 is a sideelevation showing automatic punch feed mechanism mounted on the slide of the press:

not shown.

The roll is intermittently rotated Iby means of a pawl 44 (Figs. 3 and 11) cooperating with a ratchet wheel 46. The ratchet wheel is keyed to which is freely oscillatable 'on shaft 48. Pawl arm is oscillated (see Figs. 4 and 11) by link 28 through pivoted connection 58. The ratchet wheel 46 is held against return movement by a check pawl 61|. The number of teeth in ratchet wheel 46 is made equal to the number of impressions which are to be formed around the periphery of roll R. The stroke of link 28 is made somewhat greater than needed to move the -ratchet wheel one tooth at a time, this stroke being adjustable by a 'slidable connection on crank 30 (Fig. 4). v will be advanced an amount equal to the spacing between impressions for each operation of the press.

The periphery of pilot wheel 50. is provided with a series of pilot holes 62, these being spaced accurately and uniformly around the periphery of the pilot wheel and corresponding in number to the desired number of impressions around the roll. In other words, they correspond to the number of teeth on ratchet 46. The slide'28 of the press is provided with a suitable arm or tting It will be evident that the roll I4 in which is mounted a pilot 86 (Fig. 1) dimensioned to accurately fit the pilot holes. The latter are preferably lined with hardened steel bushings. It will be evident that any slight inequalities resulting from the ratchet movement are overcome by the pilot mechanism, and further that the pilot mechanism locks the roll against any possibility of movement at the time that the roll is being struck by the master punch 34.

The centers-40 and 42 are not subjected to the load of the press. Instead, this load is taken by a special support block 68 which, as is best shown -in Figs. 3 and 1 3, is provided with a semi-cylin-V drical recess 10 which receives or cradles the roll as is indicated at 12 (Figs. l and 3), at the point ing box 82, and then wait until the press is automatically stopped. 'I'he operator then again feeds the punch downwardly a few thousandths of aninch, and again starts the press.

Referring now to Figs. 5 through l0, the specic olls there illustrated are intended to die roll a wire in order to deform the same into a series of embryo slide fastener elements. A rollingy mill for this purpose, which utilizes the.ro1ls` application, Serial No. 215,180, filed June 22, 1938,

where the impressions are punched in the roll, so

that the stress attendant upon the punching op-V eration is taken by the roll immediately at`each side of but not directly on the impressions .being made.

The position roll, may be varied by means of the pltman screw 24 (Fig. l), and in` the present case this is assumed to be manually operated, as by means of a capstan bar 'I4 which is slid into one of a series A of holes 16 in a capstan head formed on screw 24.

It will be evident that'rotation of the screw raises or lowers the slide 20, and consequently the punch 34, relative to the pitman 22, and consequently relative to the roll I0 and holder H. In accordance with the present invention th punch is fed downwardly or advanced by screw 24 until it lightly strikes the surface of the roll R'. No attempt is made to strike the impression to full depth. Instead, the impression is made to a depth ranging, say, between 2 .thousandths and 15 thousandths of an inch. The depth is preferably kept at the smaller end of this recommended range, say, at 4 thousandths4 of an inch. The press is operated continuously until impressions have been made entirely around the roll R. In fact, the operation is preferably carried more than one revolution. carried one or more impressions further than one revolution, so that the point of change of depth Vis not constant, but instead itself moves relative to the roll. After working around the roll plus,

of the punch sa, relative to the It may, for example, be'` since issued on Maynli, 1940,Y asV Patent No. 2,201,068. In this case roll 9.0, best shown in Fig. ,7, and a male roll 92, best shown` in Fig.y 10.' The wire is rolled between the impressions 94 in female roll 90, and the impressions 96 on male roll 92. The portions of the rolls on each side of the impressions may be made of equal diameter for rotationat equal speed, and may be of such diameter as 'to run substantially y in contact with one another. The rolls areA pro vided with tapered shanks 98 which are received in the shafts of the rolling mill. Each roll is in-v ternally threaded at i0!! to" receive' a .suitable draw rod which pulls the tapered shank into position. c

Referring now to Fig. 5, I rst form a blank roll R which is somewhat longer and somewhat larger in diameter thanthe finished rolls. It is provided with the internal thread |09, previously referred to.l It is preliminaly grooved at |02 to the correct diameter for the particular roll about to be made. A dat |06 `may be provided at one end to receive the set screw iii@ (Fig. l) of the dog 52.A

It will be understood that two master punches are provided, one for producing the female remay be machined to bring it tothe correct say, one impression more, the press is stopped.

the capstan bar 14 is inserted in'one of the holes 16 and is shifted by hand a very slight amount, the movement by the operator to correj spond to the desired advance or feed of the punch, this being a matter of only a few thousandths of an inch, as was previously explained.

' counts the ynumber of impressions needed for one revolution, plus the desired excess of, say, one impression. Thus, in 'the present case, the roll has eighteen impressions, and counter 32 may be 'set to count up to, say, nineteen, at whi'ch'time it closes a contact or electric switch.

Referring now, t Fig. 2, the driving motor 18 of the press is supplied with power from line 80 through starting box 82. The starting box may be released or shut down by means of a trip circuit 84 controlled by a contact or switch 8G. which in turn is controlled by the counter 32.

By thus-adding-the counter 32, the operator after feeding the punch downwardly a few thousandths oi an inch need'only start the press at the startlset and' fix the impressions on the roll.

diameter and length, and to give it the desired tapered shank.' y Y Before this machine work is performed, thev roll is preferably annealed or normalized to relieve any strain produced in the metal during the forming of the impressions therein, and to facilitate machining of the roll. After the roll has been machined it is hardened, then ground to exact dimension, and finally may be brushed to clean out and polish the impressions on the roll.

After the punch has been feddownwardly until y the impressions are of full depth, the roll is pref erably turned through two or three, or even more. extra revolutions. while the position of the punch is leftunchanged. This is in order to definitely It is desirable that the depth oi' operation of the punch be very accurately iixed at this time,l and to avoid any variations which may arise in the drive linkage extending from the punch to and including the crank shaft of the press. kFor'this purpose, Iv prefer to employ positive stop blocks fordefinitely limiting lthe downward movement` of the punch. Referring to Fig. 13, a bottom stop block lili, preferably made of hardened`- steel, is mounted on the roll support 68. A mating stop block H2, also preferably made of hardened steel, is mountedon the bottom of slide 20 in such a position as to contact the stop block ill). The punch Se is so mounted in its holder 38 as to provide the desired depth of impression when the stop blocks H9 and H2 meet. The

olls comprise a female carrying pawl 4 4.

punch holder 38 is, of course, inserted all the way home into the slide 20. Thus the operator feeds the punch downwardly a. few thousandths of an inch at a time until the stop blocks hit and prevent any further effective movement of the punch. The operator may then start the press er elements naturally have a larger number ofv impressions around the periphery of the roll.

Referring to Figs. 1 and 3 it will be seen that there is a second ratchet Wheel ||4 alongside the ratchet wheel 46. The pawl 4 4 may be used with either ratchet wheel. In Figs. 3 and 12. it is shown in position to engage the ratchet wheel 46. However, by pulling the knurledv knob ||6 (Figs. 11 and 12)4 downwardly a pin. ll8is released from a groove |20 in rod |22 The rod |22 may then be pulled outwardly by means of knurled knob |24 until a second groove |26v reaches the pin ||8. Bythen releasing the `bottom knob ||6, the pin ||8 is raised upwardly into giioove |26 by means of a push spring surrounding the pin. In this way the pawl 44 is shifted to engage the ratchet. wheel ||4 instead of the ratchet wheel 46. The pawl is normally urged toward the ratchet wheels by means of torsion -spring |28, best shown in Figs. 3 and12. The ratchet wheel is' omitted in Fig. 11.

The pilot wheel 50 is provided with a second row of pilot holes |30 (Fig. 3), these being properly spaced to correspond to the ratchet wheel ||4. Referring to Fig. 1, the pilot pin 66 may be shifted from the position shown for cooperation with the pilot holes 62, to a position for cooperation with the pilot holes |30. For this purpose, the screws |32 are loosened and pin 66 is removed from one clamping groove to a similar but displaced clamping groove |34 mating with the pilot holes |30. l

As so far described, the operation of the apparatus is only semi-automatic. It may, if desired, be made fully automatic. Referring to Figs. 14 and 15 the pitman screw 24 is provided with a worm gear |40 meshing witha worm |42 mounted on a shaft |44 carried in bearings |46 cast integrally with a mounting plate |48 bolted on the front of slide 20 by means of `bolts |50.

, slight rotation of the pitman screw which, however, is adequate to produce the desired slight feed movement of the punch. The effective stroke of feed pawl |56 is varied at the cre |62., as by means of a threaded brass rod |10 projecting downwardly from core |62 and carrying adjustable, but normally locked nuts |12. These nuts limit the upward movement of. the pawl. The downward movement is determined by` attraction of the solenoid core'|62 fully into the solenoid. Change o1 the stroke of the feed pawl may be made to correspond with a change of the ratchet wheel or, particularly when using a ratchet wheel with fine teeth, to change the number of teeth moved at each stroke of the pawl.

trical contacts, best shown 1n Fig. 13. Referring to that figure, it will be seen thata preferably yieldable, but non-adjustable contact |18` is mounted on slide 20 or, as here shown, on stop block ||2. The mounting is preferablyian insulated one. as by means of insulation |18 inserted between the parts. A micrometrically adjustable contact |80 is mounted on stop block |0, this contact being adjustable by knob |82,and its ad justment being locked by nut |84. Here again, the contact is preferably insulatedly mounted, as by means of insulation inserted at |86. The contact |80 is so adjusted that contact is made when The adjustment is critical, yet is easily made because the punch is advanced downwardly by an appreciable increment during each feed movement. If the feed is, for example, 4 thousandths of an inch,

then there is a tolerance of almost 4 thousandths changed the relative position of the contactsby 4,-thousandths of an inch.

The stop -contacts might be usedto stop the entire press, but this would not provide the desired extra revolutions of the roll R to finally set or x the impressions therein. The contacts are therefore used to first lstop only the feed of the punch and to later stop the press.

Referring to Fig. 16, the driving motor v18l of' the press is `driven by power taken from line 80 through starting boxV 82. The circuit through feed solenoid |64 runs through a relay |88, as well as through the control switch |14. ,This relay is normally closed to the left, as shown. Cur-l, rent then flows through wires4 |90 and |92 to the through Wire |94 to solenoid |64. The ,solenoid circuit is completed by means of wire |96, control switch |14 and wires |98, |99 leading back to wire 200 and the motor circuit. It will be evigins to operate. mechanism is not operative until a feed starting 2,318,445 c dent that each momentary closing of control right-hand position opens the circuit between wires |92 and |94, and thus prevents further energization of feed solenoid 64. At the same time the relay is closed to the right, and this supplies 'current from wire |90 through wire 206 to a time- K delay relay 208, which in turn is appropriately connected to the starting box82 in such a manner as to trip and open the starting box after a predetermined desired amount of time has elapsed.

YThe delay relay 208 may be of any conventional type, such as those using a heating coil' 2|0 and a bi-metallic or other thermostatic element which becomes heated up enough to close a previously open circuit.. Inr the present case the circuit which is controlled by the relay, is indicated by the wires 2|2 and functions within starting box V82 to release vor open the starting box. The time delay produced by relay 208 is made suflicient to provide the desired extra revolutions of the roll after the punch has reached full depth.

The;press then stops and the circuits are all de-energized until a new roll is placed in the machine, and the machine again started.

When a new roll is placed in the machine, it is necessary to return the punch to its retracted or elevated position. For this purpose the shaft |44 (Fig. 15) is provided with a. squared end `2M adapted to receive a small removable crank "which is not shown in the drawing. The feed pawl |58 is provided with a handle 2| 6 '(Figs. 14 and and this is pushed inwardly whileworm shaft |44 is being cranked in reverse direction the small amount needed to raise the punch to its initial position. Feed pawl handle 2|6 is then released preparatory to renewed operation of th e press.

While referring to Figs. 14 and 15, it may be explained that there is a slight oscillation of pitman 22 and pitman screw 24 relative to slide 20 during operation ofthe press. This oscillation is,

lay |88 to swing from its right-hand or latched` position to the left-hand position shown. This makes the feed mechanism operative and it refy mains. so until the contacts |16, |80 are closed, at which time the relay |88 is again moved to the right and latched in that position.

It is believed that my improved method fior making die rolls, and the construction and operation of my improved apparatus, as weil as the many advantages thereof, will be apparent from the foregoing detailed description. The rolls may bemade rapidly in onlya small fraction ofan houx'ginstead of, say, la half' day or more for each` roll. The impressions on' the roll are perfectly uniform and equally spaced and there are no abnormal or non-uniform strains in the metal of the roll.

pressions .have been brought Ato ,proper depth."

` The procedure is as follows: A master punch is rst made which is negative'to thel desired recess. Preferably a master master punch is first made whichvv corresponds to the recess, thismaster master punch being used when making the master punch. The master punch ismountedin the press. ,A blank cylinder is turned to ap? proprlate sizeand may be provided witha groove at the location of the impressions. then treated, as above described, until the im- The` end point at each depth is preferably varied, and the roll is preferably treated at the final" depth through a number ofrevolutions.

-The roll is then annealed or normalized to remove .any strains which may have been set up by the coining operation. The roll is then machined to provide the proper outside shape and dimension. For example. a tapered shank may be provided. The-roll is then hardened and finally ground and brushed for smoothness.

accommodated at the ball joint 222. The axis of wormf |42 is spaced from wormgear|40 an,

amount adequate to provide the necessary clearance between the gears to accommodate the. oscillation of the pitman screw and-with it the the necessary stroke 0f the press is small, and

furthermore the gear I4|iv is located very close to the ball joint 222. The depth of the teethl is greater than the movement involved, and the :teeth always assume the same relative mesh at the instant the feed solenoid is actuated. 'I'he pitman screw is self-locking because'of its large diameter relative to the pitch and also because any desired amount of friction may be introduced at the studs 224.

Reverting now to Fig. 16 the press is started by appropriate manipulation at thestarting box 8l. This starts the press motor 18, and the press be- However, the automatic feed button 2|8 is`depressed, this energizing a magnet 220 which'releases latclr 204, thus permitting re-- worm gear |40. `The movement is small .because equal to the desired spacing between impressions,

again striking the roll to the same slight depth. vand so on, continuing this operation. until the roll has been turned through at least one revo- It. win be understood that the screw reed for The roll is the ,punch need not vbe the pitman screw, but.

instead may be a special screw, and in fact the feed need not be a screw at lall. Moreover, in-

stead of moving the punch, the table and'roll,

holdermay be moved upwardly` by a suitable' feed, such as is used on milling machines. ,The

press itself need not be crank-operated, and may be hydraulic or even foot-operated. 't

It will therefore be apparent that while I have shown and described my invention in several preferred forms, many changes and modifications may be made in the method and structures disclosed without departing from. the spirit of the invention definedk in the following claims.

A."Iclaim:

,1. The method ofmaking a series of uniform l impressions around a. blank die roll, which ini cludes making a master punch negative to one v of the impressions to be formed around the rou, striking the .blank rou 'with the master punch .l

for a slight depth, rotating the roll an amoun lution,y striking the rollv with the 'master punch to a slightly increased depth, rotating the roll to successive impressions and' striking each-'oi' these to the slightly increased depth fr't '1am one revolution, and so on, untilthe desired final depthicreaehed.v l

2. The method of making a series of uniform impressions around n.blank die roll. "which includes making a. vmaster punch negative to one oi' the impressions to be formed around the roll, striking the blank roll with 'thejmaster punch for a slight depth, rotating the roll an amount equal to the desired spacing between limpressions, again striking the roll `to the same slight depth, and so on, continuing this operation until the roll has been turned through one revolution plus one or more additional impressions, thereupon strikingthe roll with the mas- 'ter punch to a slightly increased depth, rotating the roll to successive impressions and striki turned through one revolution, means to then automatically advance the master punch to a slightly increased depth, the alternate operation of the master punch and the roll rotating means l being continued at the slightly increased depth for one revolution, and `so on, until the desired iinal depth is reached, and means to thereupon stop the feed of the master punch without stopping the alternate operations of the master punch and the kroll rotating means.

7.,Apparatus for making a series of uniform impressions around a blank die roll, said apparatus comprising a master punch negative to one of the impressions to be formed around the roll,

means to repeatedly strike the roll with the master punch for a slight depth, means to intermit- V tently rotate the roll an amount equal to the dea slight depth, rotating the roll an amount equal to the desired spacing between impressions, again striking the roll to the same slight depth, and so on, continuing this operation until the'roll has been turned through one revolution, striking the roll with the master punchto a slightly increased depth, rotating the roll to successive impressions and striking each of these to the slightly increased depth for one revolution, and so on, until the desired iinal depth is reached, and thereupon again striking the roll to the same slight depth,

and so on, continuingthis operation until the roll has been turned through onerevolution plus one or nore additional impressions,thereupon striking the roll with the master punch ,to a slightly increased depth, rotating the roll to lsuccessive impressions and striking each of these to the slightly increased `depth for one revolution plus .one or more additional impressions, and so sions at the nal depth during one or more extra revolutions of the blank.

5. Apparatus for making a series of uniform impressions around a blank die roll, said apparatus comprising a master punch negative to one of theimpressicns to be formed around the roll, means to repeatedly strike the roll with the master punch for a slight depth, means to intermittently rotate the roll an amount equal to the desired spacing between impressions, said latter means operating lbetween the successive operations or the master punch, and means operable to advance the master punch to a slightlyincreased depth, whereby the alternate operation of the master punch and the roll rotating means may be continued at Ysuccessive slightly increased depths', until the desired final depth is reached.

. 6. Apparatus for making a j series of uniform impressions around 'ablankdie roll, said apparatus comprising a master punch negative to one of the impress/ions to be formed around the roll, means to repeatedly strike the roll with the 0 master punch fora slight depth. means to inter- I mitiently rotate the roll an amount equal tofthe desired spacing between impressions, said latter means operating between the successive operaon, until the desired nal depth is reached, and thereupon striking each of the successive impres- Y- Y' sired spacing between impressions, said latter means operating between the successive operations of the master'punch, until the roll has turned through one revolution, means to advance the master punch to a slightly increased depth, the alternate operation ofthe master punch and the roll rotating means being continued at the slightly increased 'depth for one revolution, and so on, until the desired nal -depth is reached, means to thereupon stopfthe feed of the master punch without stopping the alternate operations of the master punch and roll rotating means until the roll has turned through one or/ more extra' of the complete apparatus.

8. Apparatus for making a die roll out of a generally cylindrical blank, said apparatus comprising a reciprocating press including a'table, a crank shaft thereabove, a slide therebetween, and a -pitman connecting said crank shaft to revolutions, and means to then strip the operation said slide, a rotatable roll holder mounted on said table and vincluding centers, arranged to.accu

rately receive the ends of the blank, ratchet feed means connected to said roll holder and operated by said press, a master punch mounted in a slight amount at a time.

9, Apparatus for making a die roll, said apparatus comprising a reciprocating "press, a roll holder mounted in said press. ratchet feed means connected to said roll holder and operated by said press, a master punch mounted in the press, a. disc secured to said roll holder and having pilot 4 recesses spaced at the desired spacing ofthe impressions around the'roll, a pilot reciprocated by said press -to enter said pilot recesses, and means "adapted to advance the `punch aslight amount at a time. f

10. Apparatus formaking a Adie roll, said apparatus comprising-a reciprocating press including a table, a crank shaft, a slide, anda vpitmari connectingsaid shaft to said slide, a roll holder mounted on said table, ratchet feedI means connected to said holder and Operated b'y said press.- a master punch mounted in the slide, a disc secured to said lroll-holder and havingv pilot recesses spaced at the desired` spacing oi the impressions around the roll, a pilotreciprocated by said slide to enter said pilot recesses, and a pitman screw adapted to advance the punch a slight amount at a time.

11. Apparatus for making a die roll, said apparatus comprising a reciprocating press, a rotattions of the master punch, until ythe roll has able roll holder mounted in said press, ratchet feed means connected tosaid holder andop. erated by said press, a master punch mounted in the press, readily accessible means operable to advance the punch a slight amountat a time,

desired full depth relative to the roll holder, despite further operation of the aforesaid means to advance the punch.

12. Apparatus for making a die roll, said apparatus comprising a reciprocating press, la roll -holder Vmounted in said press, ratchet feed means connected to said holder and operated by said press, a master punch mounted in the press, a disc secured to said rollholder and having pilot recesses spaced at the desired spacing of the impressions around the roll, a pilot reciprocated by said press to enter said vpilot recesses, means adapted to advance the punch a slight amount at a time, and stop blocks to limit movement of the punch when it has reached a predetermined desired full depth relative to the roll holder.

13. Apparatus for making a die roll, said apl and stop blocks to positively limit ,movement of the punch when it has reached a predetermined paratus comprising a reciprocating press, a roll holder mounted in said press, ratchet feed meansj connected to said roll holder and operated by said press, a master punch mounted in the press,

, a disc secured to said roll holder and having pilot in order to afford an opportunity to advance the punch. l

14. Apparatus for making a die roll, said apparatus comprising a reciprocating press, a roll holder mounted in said press, ratchet feed meansY connected to said roll holder and operated by said press, a master punch mounted in the press, a disc secured to said roll holder and having pilot operates said `feed means to advance the punch after each such revolution of theJ roll, and means to automatically stop theY feed of the punch when the punch has reached a desired full depth relative to the'roll holder. 17.` Apparatus for making a die roll, said apparatus comprising `a reciprocating press, i a roll holder mountedin said press, ratchet feed means connected to said roll holder and operated bl'y said press, a master punch mounted in the press, punch feed means to advance the-punch a slight amount at a time, a counter for counting the operations of the press yfor approximately one f l revolution of the roll, means whereby said counter operates said feed means to advance the punch after each such revolution of the roll, means to automatically stop thek feed of the punch without stopping the press when Athe punch has reached a desired full depth, and means to automatically stop the press some time later after the roll has been turned through one or more additional revolutions.

18. Apparatus for making a dielroll, saidapparatus comprising a reciprocating press including a table, a shaft, a slide and a pitman connecting said shaft to said slide, a roll holder mounted on said table, ratchet feed means connected yto said i recesses spaced at the desired spacing of the impressions around the roll, a pilot reciprocated by said pressand arranged to enter said pilot recesses, means adapted to advance the punch a slight amount at a time, a motor for driving the press, a trip counter set tolcount the number of ratchet movements and to trip after one revolution of the roll holder plus one or more additional impressions, and means responsive to tripping of said counter to stop the motor of the press, in order to afford an opportunity to advance the pitman screw.

15. Apparatus for making a die roll, said apparatus comprising a reciprocating press, a roll holder mounted in said press, ratchet feed means connected to said roll holder and operated by said press, a master punch mounted in the press, punch feed means to advancethe punch a slight amount at a time, a counterfor counting the ratus comprising a reciprocating press, a roll holder mounted in said press, ratchet feed means n connected to said roll holder and operated by said press, a master punch mounted in the press,- punch feed means to advance the punch a slight amount at a time, av counter forvcounting the operations of the press for approximately one revolution of the roll, means whereby said vcounter roll holder and-operated by said press, `a master punch mounted in the slide of the press; adisc secured to said roll holder and having pilot recesses spaced at the desired spacing of the impressions around th'e roll, a pilot reciprocated by said press and arranged to enter said pilot recesses, a pitman screw adapted to advance the punch a slight amountat a time. automatic feed a means including a solenoid, pawl and ratchet feed mechanism operated thereby, and worm and gear mechanism driven by said feed ratchet for turning said pitman screw ja small amount at a time, a. counter for counting the operations ofthe press for approximately one revolution of the roll, means whereby said counter operates said feed solenoid to advance the punch after` each suchl revolution of the roll, and means to automaticallystopthe feed of the punch when the punch has reached a desired depth.

19. Apparatus for making a'die roll, said apparatus comprising areciprocating press includ'- ing a table, a shaft, a slide, and a pitman conncting said shaft to vsaid slide, a roll holder mounted on said table, ratchet feed means connected to said roll holder and operated bysaid` i press, amaster punch mounted in the slide of the press, a disc secured to said roll holder and having pilot recesses spaced at the desired spacing of theimpressions around the roll, a pilot reclprocated by said press and arranged to enter l said pilot recesses, a pitman screw adapted to advance the punch a slight amount at a time, automatic feed means includinga solenoid,paw1 and ratchet feed mechanism operated thereby, and f worm and gear mechanism driven by said feed ratchet for turning said pitman screw a small amount at a' time, a counter for counting the operations of the press for one revolution of the roll plus a snrall additional amount, means wherekby said counter operates said feed solenoid to advance the punch after each such revolution-plus of the punch without stopping the .press when Y the punch has reached a 'desired depth, and means to automatically stop the prasome time f later after the roll has beenturned through one or more additional revolutions. v Y

20. Apparatus for making a'die 'rollout of'al generally -cylindrical blank, said apparatus comprising a reciprocating press including a table, a crank shaft, a slide, and a `pitman connecting said shaft to said slide, a rotatable roll holder mounted on said table, ratchet feed means connected to said rotatable roll holder and operated by said press, a master punch mounted in the slide, means operable to advance they punch a slight amount at a time, and a recessed support` block on saidv table directly beneath and suby stantially in contact with said blank to take the' p reaction ofthe punch.

Y 21. Apparatus for making a die roll out of a generally cylindrical blank, said apparatus com- Y prisving a reciprocating press, a rotatable -rol1 holder mountedi'n said press, ratchet feed means' connected to said rotatable holder and operated by said press, a master punch mounted in the press, means operable to advance the punch a slight amount at a time, a support block directly beneath and substantially in contact withsaid blank to take the reaction of the punch, and stop blocks to limit movement o the punch when it I has reached a predetermined desired full depth relative to the roll holder.

22. Apparatus for making a die roll with either oi.' two sizes of impression, said apparatus comprisinga reciprocating press including a table, a crank shaft, a slide and a pitman connecting said shaft to said slide, a roll holder mounted on said table, ratchet feed means connected to lsaid holder and `operated by said press,` said feed means including two adjacent ratchet wheels having vdifferentl numbers of teeth, a master punch mounted in the slide, circular means secured to said roll h'older and having two sets of different` iy spaced pilot recesses spaced at the desired spacing of the impressions around the roll, one

set .of pilot recesses corresponding to one ratchet a slight depth, rotating the roll an amount equal l to the desired spacing between impressions, again striking the roll to the same slight depth,l and so on, continuing this operation until the roll has been turned through morethan one revolution, striking the roll with. the master punch to a slightly increased depth, rotating the roll to suc,-Jv

cessive impressions and striking each of these to the slightly increased depth for more than one revolution, and so on, until and including rotation for more than one revolution at the desired final depth.

' GEORGE WINTRITZ'.