US2488610A - Method of and apparatus for setting feeding mechanisms for material working machines - Google Patents

Description

Nov. 22, 1949 c. sTAcKAwlcz 2,488,519

METHOD OF AND APPARATUS FOR SETTING FEEDING MECHANISMS FOR MATERIAL WORKING MACHINES 'Filed Feb. 14, 1948 r 4 Sheets-Sheet 1 INVEN TOR C. 5734 CKA'W/CZ A 7" TORNEY Nov. 22, 1949 c. STACKAWICZ 2,488,610

METHOD OF AND APPARATUS FOR SETTING FEEDING MECHANISMS FOR MATERIAL WORKING MACHINES Filed Feb. 14, 1948 4 Sheets-Sheet 2 lNVENTOR C. 874 6/04 W/CZ ATTORNEY Nov. 22, 1949 c. STACKAWICZ 2,488,610

METHOD OF AND APPARATUS FOR SETTING FEEDING uscmmxsms FOR MATERIAL WORKING MACHINES Filed Feb. 14, 1948 4 Sheets-Sheet 5 4/ //vv/v TOR 1 f c. 5 TA 6/64 w/cz I A r TORNEV 1949 c. STACKAWICZ 2,488,610

METHOD OF AND APPARATUS FOR SETTING FEEDING MECHANISMS FOR MATERIAL WORKING MACHINES Filed Feb. 14, 1948 4 Sheets-Sheet 4 INVENTOR C. 8 T4 CKA W/CZ' By WW A T TORNEV Patented Nov. 22,1949

UNITED STATES PATENT OFF l- CE 22,488,610 METHOD OFANDKABPARATUS FOR SETTING FEEDING MEGHANISMS :FOR MATERIAL WORKING MAGHI-NES I Carl Stackawicz, Arlington, N. J., assignor to Western Electr-icfiompany, Incorporated, New York, N. -Y., a corporationwofv'New York Application February 14, 1948,,Serial No. 8,464

9 Claims; 1

This invention relates to a method of 'and'appa-l working machines such as automatic punch presses, and has for its objects, a method of and apparatus for varying the material feeding'means -5 parts to determine how far off one way or the for such machines accurately with a minimum other the initial setting of the feeding-mechanism loss of time and no .loss of material as required was made. The operator again adjusts the feedwhen practicing the conventional methods of lug-mechanism attempting to-correct the initialsetting feeding mechanisms of such machines. setting and again operates the machine, feeding The conventional automatic punch presses for 10 material thereto. This method of-setting up-the punching and blanking parts from large coils or press requires considerable time and material. strip stock have feed rolls between which the Itis not possible during this method to determine stock is advanced longitudinally relative to the whether or not the press is set accurately for the punches and blanking-dies of the press. Theldisselected material and the desired speedof the tance the stock is fed during eachoperating cycle press. unless numerous parts have been blanked of the press must vary with variations in the-size from the material. of parts to be blanked from thestock. Further- In accordance with the aforementioned objects, more, in machines of this type, which areoperable the'invention comprises an apparatus by theaid at variable speeds depending upon the :size of-the of. which the method may be practiced for setting part to be blanked and/or the thickness of. the the feeding mechanism of an automatic material material from which it is to be blanked, there Working machinesuch as a punch press including may exist an overrunning of the feed rollsor feed rolls driven by an adjustable mechanism other conditions to cause inaccurate advanceconnected to the crank shaft of the machinethe ment of the material for one or more blanking apparatus including a marking element operated operations throughoutthe length ofrthey'stock. at agiven time during each operating cycle of" In certain instances Where bothqpunching-and thelmachine to marka material or member ad; blanking operations are performed to produce vanced''by the"feed rolls of the machine relative perforated parts blanked from the'stocklsalthougn to a. measuring m n wh r y he material feed both perforating and blanking operations areg m vementsnoi the feed rolls may'be accuperformed simultaneously during an -zopera-tmg, ratelymeasured to determine whether or notthe cycle of the press, they are. in effect,.:per-ormedl drivingmeans .for the feed rolls has been accusuccessively on each partof the :productafrom the: rately set. .A calibrated element for the adjuststock. In other words, a portion of the stock i gmec a sm 0f th dr ving means for the feed from which a part is to be produced, is punched 2;: rolls may be actuated to correct any error in the. during one operating cycle and then advanced initial Setting of the m h n to the blanking die for the next operating-cycle More p y, the ap a atus includes tawhen the part is blanked from the Stock. msucli table o which a material or member m y instances pilot pins r mounted l r blanking, advanced intermittently by the feed rolls of the punch to enter the apertures i th t ck formed machine. A Vernier scale divided into tenthslof, during the previous punching or perforating opan inch is positioned adjacent the path of the eration to make .a final adjustment in the stock; member and a p t vable 0n la.- micrometer freed at that time from the feed rolls, to produce Screw Successive a nt w h the marks an accurate part. However, unless'the stock is n the member c e a magnifyin 'e s nd" advanced the given distance required "for that a locating hairline to Obtain accurate ifi 'O particular part, or withi a minute t o the scale. The distance between the marks-ontherefrom, the pilot pins will fail to enter-the the member caused y h m in e ntdurapertures and will thus damage the part blanked s each operating cycle of the i -m ybe from th t k calculatedin thousandths of an inchl by the'com- Heretofore, the feeding mechanisms of such billed readings @fthevernier a a icm machines have been set by the cut and try method, the setup man, initially guessing at the adjustment of the eccentric connection between the feed roll actuating mechanism and the-crank shaft of the press and then operating the press" 2 while the'feed rolls advance material :to athe rdies. The operator then determines the conditions of the parts produced from the material, observing the positions of the apertures within the blanked eter on the micrometer screw. 'The standard adjusting means including an eccentric connection between the crank shaft of the mach'ineand an actuating rod for intermittently driving the feed rolls includes an adjusting screw-formerly actuated by a wrench which has been replaced by a calibrated wheel movable relative to an arrow or pointer on the wheel by the aid of which additional adjustments may be made to increase or shorten the feeding stroke of the machine by rotating the calibrating wheel a given distance in either direction.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawings, wherein Fig. 1 is a fragmentary rear elevational view of an automatic machine such as a punch press illustrating the apparatus by the aid of which the method may be practiced; I

Fig. 2 is a top plan view of the major portion of the apparatus;

Fig. 3 is a vertical sectional view taken along the line 33 of Fig. 2;

Fig. 4 is an enlarged vertical sectional view of the marking unit taken along the line 4--4 of Fig. 2;

Fig. 5 is a vertical sectional view taken along the line 5-5 of Fig. 2;

Fig. 6 is an enlarged fragmentary sectional view of a portion of the apparatus;

Fig. 7 is a fragmentary end elevational view of the adjusting mechanism for the feed rolls; and

Fig. 8 is a fragmentary sectional view taken along the line 8-8 of Fig. '7.

1 The machine employed to illustrate the invention is an automatic press indicated generally at IU capable of receiving dies for perforating, punching, blanking and/or forming articles of strip or sheet material. The machine includes a, main frame including a base |2 supporting a mounting plate M for a lower die or group of dies l5. A reciprocable ram or upper member I6 is supported for vertical movement in the conventional manner upon guide rods only one of which is shown in Fig. 1 of the drawing. The ram I6 is reciprocated through its operative connection with a crank shaft I8, on one end of which is mounted a head 20 for connection with the feed rolls 2| and 22 of the machine. The head 20 has an integral guide 23 to receive and guide the inner end of a spindle 24. The inner end of the spindle 24 is internally threaded to receive an adjusting screw 26 rotatably supported in the head 20 and held against longitudinal movement therein. The outer end 21 of the adjusting screw 26 is square in crosssection to receive an adjusting wheel 28 having calibrations 29 thereon to be moved relative to a pointer mounted at a suitable position on the periphery of the head 20.

Through rotation of the adjusting screw 26 the axis of the spindle 24 may be moved relative to the axis of the crank shaft I8 to vary the rotary movement imparted to the feed rolls 2| and 22 depending upon the distance the material is to be advanced relative to the dies in the machine during each operating cycle of the machine. A connecting element 30 having its upper end mounted on the spindle 24 has its lower end extending through a sleeve guide 3| and provided with rack-like teeth for operative connection with the conventional drivin means for the drive roll 2| including the conventional roller friction clutch whereby the feed rolls will be driven in one direction during movement of the element 30 in one direction, that is, during one-half cycle of the crank shaft l8, the feed rolls being held against rotation during the other 4 half cycle of the crank shaft. It is not believed necessary to show the mechanism operatively connecting the element 30 with the feed rolls, nor is it believed necessary to show in detail the mechanism for raising the feed roll 22 free of the material during the period of each operating cycle when the dies or other material working tools of the machine are performing work on the material.

In machines of this type capable of automatic operation during variable revolutions per minute and wherein the material may be advanced varied distances during each operatin cycle, and these distances differing within thousandths of an inch, the accuracy required in setting up the machine for producin a given part or article is of great importance. A small variation, one way or the other from an accurate setting of the machine would result in the machine producing useless parts or articles. On the other hand, the cost of manufacturing such parts or articles, not only depends upon how fast they may be produced from the machine, once it is accurately set up for operation, but upon the time spent and the material lost in setting up the machine.

The apparatus, by the aid of which the method may be practiced, for rapidly and accurately setting up machines for operation by adjusting the feeding means thereof to advance material predetermined distances, includes a table 35 having its left end (Fig. 2) nested in a recess 35 of an angular mounting bracket 31 and secured thereto by screws. A bracket 38 mounted on the main frame ll of the machine is grooved at 39 to receive mounting bolts for mounting the apparatus to the machine. A scale 40 is mounted on the upper surface of the table 35 adjacent a path for material 4| advanced intermittently by the feed rolls 2| and 22 of the machine. The scale 4|] is divided first into inches indicated by numerals 42 and then into tenths of inches by graduations 43.

A bracket 45 mounted on the table 35 and extending vertically therefrom carries a friction drag unit indicated generally at 46 and including a ball member 41 urged downwardly on the material 4| by a spring 48, the force of which may be varied by an adjusting screw 49 held in any adjusted position by a lock nut 50. The purpose of the unit 46 is to permit longitudinal movement of the material 4| by the feed rolls 2| and 22 and to hold the material against additional movement when the material is free during the portion of the operating cycle of the machine when the feed roll 22 has been moved upwardly from the material. The structure of the ball member 41 does not interfere with the initial Sliding of the material 4| over the upper surface of the table 35 and between the feed rolls,

A micrometer screw 53 is mounted parallel with the scale 40, one end being journalled for rotation in the bracket 45, while the other end is mounted for rotation in a suitable bearing 54, the screw being held against longitudinal movement. The threads of the screw 53 are of such pitch that one thread equals one tenth of an inch to move a pointer or indicating element 55, threadedly mounted at 56 on the screw, onetenth of an inch during each cycle of rotation of the screw. A micrometer element 58 mounted on the outer end of the screw has graduations 59 thereon-in one thousandths of an inch reading from a zero position 60 relative to an indicating line 6| on a stationary member 62. The screw is-rotated through the raid of a hand crank=63 mounted on thelouter .end thereof adjacent the.

micrometer (58.

The pointer '55 carries a grooved block .85 (Figs. 2 and 6) to straddle the adjacent edge 66 of the table 35 to maintain accurate movement of the pointer relative to the scale 48 and the material 41 during rotation of the micrometer screw 53. An aperture 8'! is formed in the pointer 55 which is oval in general contour and positioned to move over the grad-uations 4.3 and the numbers 52 of the scale 48 to obtain accurate readings as hereinafter described. A wire of a given gage indicated at 68 is stretched across the aperture 61 parallel with the indications 43 and in alignment with the point or indicating edge 18 of the pointer 55. To assist in accurately reading the position of the wire 68 relative to the scale 40, a magnifying unit I2 is positionedabove the pointer 55 and. supported by a bracket I3 mounted on the threaded portion 56 of the pointer unit.

Means is provided to mark the material 4| subsequent to each advancement thereof by the feed rolls to accurately indicate the material feed of the machine for a given setting of the feeding mechanism. This means includes a marking element having an edge 76 to engage the material 4| and form a mark thereon during each reciprocable movement of the element. is mounted on a holder 11 supported for vertical movement in a bracket I8 and normally urged upwardly by a spring 79.

portion 88 at its lower end for movement of the material 4! therebeneath. A round headed screw 8I is mounted in the upper end of the holder TI to be engaged by the adjacent end of a rocking lever 82 (Figs. 2 and 3). The lever 82 is pivotally supported at 83 and has its other end notched at 84 to straddle a pin 85. in a rod 88 connected to a core 81 of a solenoid 88. The lower end of the lever 82 as well as the rod 86 rests upon a cushion 89 mounted upon a lower support 98 of the apparatus. The solenoid,

is energized through an electrical circuit under the control of a microswitch 92 mounted on a bracket 93 supported by the main frame I I of the machine.

A cam 95 mounted in a fixed position on the upper member I6 of the machine is movable therewith to engage a roller 96 of a switch arm 91 to move the switch arm about its pivot 98 to move a plunger 99 inwardly to close the normally open microswitch 92 The cam 95 is so positioned that the switch 92 will be closed after each successive advancement of the material 4| by the feed rolls 2| and 22 near the lower end of the operating stroke of the machine. The switch 92 is in a circuit connected with a supply line through a conductor cable I88. A socket I8I is included in the circuit leading from the switch 92, which is completed by a plug I82 removably connected to the socket, through a conductor cable I83 to the solenoid 88 as illustrated in Fig. 2. In this manner, the microswitch 92 and the cam 95 may be made permanent parts of machines to which the apparatus may be remova'bly connected, the electrical connection being made between the switch and the solenoid '88 by connecting the plug I82 with the-socket I8 I.

The table 35 supports channel members I85 with spaced threaded apertures I86 in the lower portion thereof to receive winged screws I81 for the location of adjustable stops I88 predetermined distances from the scale 48 depending upon the The element 75 The bracket 18 is. 'mounted upon the table 35 and has acutaway The pin 85 is mounted wictnesthe materialdile Elongateapertures I89" I12 carried-in spaced apertures of the bracket 31,. in the groove 39 ofthe bracket 38 on the machineandsecuring the apparatus in place by tighten -v ing the mounting bolts. The upperisurface of the table is positioned to support a material 4I selected to-receive .themarks II 4 made thereonv by the marking element 16. The test material 4I may be-of any desired, inexpensive structure suitable for advancement between the feed rolls 2I' and22 during operationof themachine and to re-H ceive the marks II4 from the marking element.

In this manner, the stock material from which the articles are to be produced during operation of the machine, need notbeemployed during the setting of the machine as was necessary with the former cut and try method.

"The stops I88 are adjusted to guide the material M in a path adjacent the scale 48 as it is advanced between the feed rolls 2I and 22. The operator, knowing the speed at which the machine should operate ;and the linear feed required for the stock material from which the articles are to be produced, makes an initial adjustment of the eccentric connection 24, namely spindle (Figs.

7 and'8) relative to the axis of the crank shaft I8 by rotating the adjusting screw 26 through the aid of the hand Wheel 28. The machine is now set in operation and runs through a given number of operating cycles to cause the feed rolls 2| and 22 to intermittently advance the test material (III.

the solenoid 88, pulling the core 81 upwardly to rock the lever 82 about its pivot, to force the marking element I5 against the force of its spring 19 downwardly, whereby the edge 16 of the element' will form a mark .I I'4Iat a given position operating cycle of the machine may be accurately measured.

After a given number of operating cycles of the machine have been completed, the machine is stopped and'the distances between the mark II'4 are measured. These measurements are accomplished through the cooperation of the pointer 55, the scale 48 and the micrometer 58. The pointer 55 moved to register with the mark 4 nearest the marking element 15, that is, at the farthest position to the right (Fig. 2).

When in this position, the operator vmay note the reading adjacent the wire, or hairline 68, on the scale 48 and. obtain'a complete reading by adding thereto the reading of the micrometer 58, that is, the graduation 59 registering with the indicating line 61'. This may be described as the first reading. The second reading may be determined in the same manner when the pointer 55 is moved to register with the second mark II4 to the leit:

The cam operates the switch 92 into closed position intermediate the advance- "ments of the material to cause energization of ofthefirst mark by rotation of the micrometer screw 53. By subtracting the first reading from the second reading, the distance between the first and second mark will be known. The operator continues taking the readings of the scale 40 and the micrometer 59 at each mark H4 in succession until all of the readings have been made and the distances between the markings determined. In this manner, the operator may determine the average advancement of material by the feeding rolls as a result of the initial setting of the eccentric connection of their driving means with the crank shaft. As previously explained, the distances the material is fed or advanced during each cycle of operation of the machine by the said rolls, are not always identical owing to possible overrunning of the roller friction clutch in the driving mechanism for the rolls. This condition exists mainly when the speed of operation of the machine is increased and for this reason, several operations must be made to determine the average distance the material will be fed or advanced as a result of a given setting of the feeding mechanism. To exemplify this condition, the feeding mechanism may be set to accurately feed the material a given distance during operation of the machine at a given speed and by varying the speed of operation of the machine, there will be a decrease or increase in the overrunning of the feed rolls to change the linear feed of the material without making adjustments in the feeding mechanism.

Subsequent to making the mark H4 on the material resulting from the initial setting of the feeding mechanism and determining the average distances between the mark, the operator may readily determine the additional adjustment necessary in the feeding mechanism, through rotation of the adjusting screw 26, to complete the adjustment of the feeding mechanism for the linear feed desired. The calibrated wheel 28 has graduations representing thousandths of an inch, relating to the linear travel of the material, and if, for example, the material 4| has been advanced two thousandths of an inch too far resulting from the initial setting of the machine, the graduated wheel 28 may be turned relative to its pointer, the distance of two markings 29 on the wheel in a direction to reduce the distance of travel of the feed rolls that amount.

It is to be understood that the above described arrangements are simply illustrative of the application of the principles of the invention. Nu-

merous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. The method of setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on a stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently Variable rotary distances by an operating mechanism interposed between the feed rolls and the main shaft including an adjustable eccentric connection with the main shaft, the method comprising initially setting the material feeding mechanism by adjusting the eccentric connection relative to the axis of the main shaft to a position presumed to cause the feed rolls to advance material a given distance during each operating cycle of the machine, operating the machine through a predetermined number of cycles causing the feed rolls to' advance a material intermittently, marking difference between the average linear feed for each of said cycles and a required feed to produce a given article, and subsequently adjusting the eccentric connection to vary the rotary movement of the feed rolls to condition them to advance a stock material the required linear feed during each operating cycle of the machine.

2. The method of setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on a stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechanism interposed between the feed rolls and the main shaft including an adjustable eccentric connection with the main shaft, the method comprising initially setting the material feeding mechanism by adjusting the eccentric connection relative to the axis of the main shaft to a position presumed to cause the feed rolls to advance material a given distance during each operating cycle of the machine, operating the machine through a predetermined number of cycles causing the feed rolls to advance a material intermittently, marking the advanced material at the end of each movement thereof, measuring the distances between the markings on the material to determine the difierence between the average linear feed for each of said cycles and a required feed to produce a given article, and subsequently adjusting the eccentric connection a measured distance to increase or decrease the rotary movement of the feed rolls to condition them to advance a stock material the required linear feed during each operating cycle of the machine.

3. An apparatus for setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechanism interposed between the feed rolls and the main shaft including an adjustable eccentric connection with the main shaft, the apparatus comprising a table mounted with its upper surface to support a material advanced intermittently by the feed rolls, a marking element positioned over the path of the material, means actuable by the machine at a given time during each operating cycle thereof to actuate the element to make a mark on the material, and means to measure the distances between the markings on the material to indicate the distance stock material would travel between the feed rolls resulting from an initial setting of the adjustable eccentric connection, whereby a predetermined subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance stock material a given distance during each operating cycle of the machine.

4. An apparatus for setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechanism interposed between the feed rolls and the main shaft including an adjustable eccentric connection with the main shaft, the apparatus comprising a table mounted with its" upper surface to support a material'adfractions of an inch, and a pointer movable relative to the material and scale and having aligned portions, one to register successively with the marks made on the material by the marking ere. ment and the other to lie parallel withthe indicia on the scale to indicate the distancestock material would travel between the feed rolls resulting from the initial setting of the adjustable eccentric connection, whereby a known subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance the stock material a given distance during each operating cycle of the machine.

5. An apparatus for setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechan sm interposed between the feed rolls and the main shaft including an adiustable eccentric connection with the main shaft, the apparatus comprising a table mounted with its upper surface to support a material advanced intermittently by the feed rolls, a marking element positioned over the path of the material, means actuable by the machine at a given time during each operating cycle thereof to actuate the element to make a mark on the material, a unit supported by the table and cooperating therewith to hold the material against movement intermediate the longitudinal advancement thereof by the feed rolls, and means to measure the distances between the markings on the mater al to indicate the distance stock material would travel between the feed rolls resulting from an initial setting of the adjustable eccentric connection, whereby a predetermined subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance stock material a given distance during each operating cycle of the machine.

6. An apparatus for setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed ro ls of the feeding mechanism driven intermittently variable rotary distances b an operating mechanism interposed b t een the feed rolls and the main shaft including an adjustable eccentric connection with the main s aft. the apparatus comprising a table mounted with its upper surface to support a material advanced intermittently by the feed rolls, a marking element positioned over the path of the material, means actuable by the machine at a given time during each operating cycle thereof to actuate the element to make a mark on the material, a guide cooperating with the scale and adjustably supported by the table for location varied distances from the scale to guide mate rials of different widths in a given path adjacent the scale, and means to measure the distances between the markings on the material to indicate the distance stock material would travel between the feed rolls resulting from an initial setting of the adjustable eccentric connection, whereby a predetermined "subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance stockmaterial a given distance during each operation cycle of the machine.

mechanism. driven intermittently variable rotary distances by an operating mechanism interposed between the feed. rolls and. the main shaft including an adjustable eccentric connection with the main shaft, the apparatus comprising a table mounted with its upper surface to support a material advanced intermittently by the feed rolls,

a markfng'element. positionedv over thepath of thematerial, means actuable by the machineat a givenitime during eachoperating cycle thereof to. actuate.the element. to make a .mark'. on the material; a scale mounted 011 the table adiacent the path of the material with indicia representing given fractions of an inch, a pointer movable relative to the material and scale and having aligned portions, one to register successively with the marks made on the material by the marking element and the other to lie parellel with the indicia on the scale to indicate the distance stock material would travel between the feed rolls resulting from the initial setting of the adjustable eccentric connection, whereby a known subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance the stock material a given distance during each operating cycle of the machine, and a magnifying lens mounted to move with the pointer to facilitate accurate registration of the first portion of the pointer with the marks successively and accurate reading of the scale adjacent each mark.

8. An apparatus for setting the feeding mechanism Of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechanism interposed between the feed rolls and the main shaft including an adjustable eccentric connection with the main shaft, the apparatus comprisin a table mounted with its upper surface to support a material advanced intermittently by the feed rolls, a marking element positioned over the path of the material, means actuable by the machine at a given time during each operating cycle thereof to actuate the element to make a mark on the material, a scale mounted on the table adjacent the path of the material with indicia representing given fractions of an inch, a pointer movable relative to the material and scale and having aligned portions, one to register successively with the marks made on the material by the marking element and the other to lie parallel with the indicia on the scale, a micrometer screw extending through a threaded aperture of the pointer and having threads of a given pitch to move the pointer the distance between the indicia on the scale during a given rotary movement of the screw, a micrometer rotatable relative to a stationary indicating line to rotate the screw and having indicia thereon representing smaller fractions of an inch than the indicia on the scale and cooperating with the scale to indicate the distance stock material would travel between the feed rolls resulting from the initial setting of 11 the adjustable eccentric connection, whereby a known subsequent adjustment of the eccentric connection may be madeto cause the feed rolls to advance the stock material a given distance during each operating cycle of the machine.

9. An apparatus for setting the feeding mechanism of a material working machine having a main shaft to be driven through operating cycles to cause operation of tools on stock material to be fed to the tools by feed rolls of the feeding mechanism driven intermittently variable rotary distances by an operating mechanism inter- 12 intermittently by the feed rolls, a marking element positioned over the path of the material, means actuable by the machine at a given time during each operating cycle thereof to actuate the element to make a mark on the material, means to measure the distances between the markings on the material to indicate the distance stock material would travel between the feed rolls resulting from an initial setting of the adjustable eccentric connection, whereby a predetermined subsequent adjustment of the eccentric connection may be made to cause the feed rolls to advance stock material a given distance during each operating cycle of the machine, and a wheel to rotate the adjusting screw calibrated correspondingly to the pitch of the threads of the screw to vary the feeding mechanism to vary the linear feed of the material given fractions of an inch by the feed rolls.

CARL STACKAWICZ.

No references cited.

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