US2821388A

US2821388A - Roll feed adjustment

Info

Publication number: US2821388A
Authority: US
Inventors: Edward V Crane; Sr Frank P Fehn
Original assignee: EW Bliss Co Inc
Current assignee: EW Bliss Co Inc
Priority date: 1956-01-27
Filing date: 1956-01-27
Publication date: 1958-01-28
Anticipated expiration: 1975-01-28

Description

Jan. 28, 1958 E, v, CRANE ETAL 2,821,388

ROLL FEED ADJUSTMENT 2 Sheqts-Sheet '1 Filed Jan. 27, 1956 zzvmvron EDWARD v. cams FRANK P. FEI-IN, 52.

BY ULHLMTX; T ATTQ NEYS Jan; 28, 1958 E. v. CRANE ETAL 2,821,383

' ROLL FEED ADJUSTMENT Filed Jan} 27, 1956 2 Sheets-Sheet 2 48 vTl 35 mmvrox EDWARD V. CRANE BY FRANK P. FEHMSR.

A'r'roansvs United States PatentO ROLL FEED ADJUSTMENT Edward V. Crane and .Frank P. Fehn, Sr., Canton, Ohio, assignors to E. W. Bliss Company, Canton, Ohio, a corporation of Delaware Application January 27, 1956, 'SerialiNo. 561,764

11 Claims. (Cl. 2712 .6)

invention relates to a roll feed auixiliary adjustment, but has reference more particularly "to an adjustmeut of this character which is especially useful for presses in which a strip of metal iisautomatically and intermittently 'fed for operations thereon, .such as blanking, piercing, drawing, etc.

In presses :of this kind, the metal strip, coil or sheet is usually ,fed past the dies by means of a roll which is rotated intermittently through a small arc to expose fresh sections of the metal strip to the action of the dies. Such rotation of the roll is usually effected by means of some suitable ratchet mechanism which in turn, is actuated by the crankshaft of the press through the intermediary of a 4 rod eccentrically connected to the crank-block. The rod is subjected to :a combined oscillatory and reciprocatory movement to oscillate .a shaft and suitable connections from said oscillating shaft ;to said ratchet mechanism.

Methods employed heretofore to adjust the feed stroke of "a roll consisted in varying the eccentricity of said rod by means requiring sthe stopping of the press during the adjustment. :However, the act .of stopping the press renders a time adjustment 'di-flicult to obtain since the press :must be arestarted to determine the efficacy of the I ments for feed stroke adjustment since manual adjustments on :a continuously running mechanism still must depend 'on sthetalertness and skill of the operator to detect and correct imperfect feeding.

Now rthat lithograph type printing of coils of metal strip is increasingly being used onrmany diversified articles of manufacture, the tolerances required in press operations-on such strip are becoming exceedingly close. It follows :therefore ;that :slight misfeeds, which were heretofore not (of sufficient magnitude to justify correction, now sometimes result in a high incidence of scrap. problem isparticularly acute with long coils of lithographed :stoc-k where feed variations during the lithographing process :may create irregularities in the pattern spacing. .Such irregularities .may occur at random and, ifinot compensated for as they occur, will make registration of the,patterns with the press dies impossible regardless of the accuracy .of the feed of the coil strip into the press. For this reason, an .adjustment .in the length of feed must be able to be made .quickly and automatically, while the machine is in operation, since it is .no longer possible 'to relyonmanual adjustments to keep a pressin'operatingadjustmeutsuch as will consistently produce acceptable articles of manufacture from lithographedi coils of metal strip. WI-file this problem 'is particularly associated with long coils, it may also arise "with shorter 2,821,388 Patented Jan. 28, 1958 strips of sheet material and for the sake of brevity and simplicity of exposition the word sheet as used hereinafter is intended to refer to material in any of the above mentioned forms.

It is a principal object of the invention, therefore, to provide an adjustment for roll feeds which will obviate the disadvantages of the aforesaid heretofore employed expedients.

Other objects of the invention include the provision of novel roll feed adjustment means which is fully automatic in operation; the provision of novel roll feed adjustment means which will automatically compensate for misaligned or misspaced patterns on lithographed coiled stock so that good registry is maintained between the patterns and the press punch and die members at all times; the provision of a novel roll-feed adjustment means which automatically compensates for misfeeding of stock whereby good registry is maintained at all times between the press punch andrdie members; the provision of novel feed adjustment means which automatically compensates for misspaced patterns on lithographed stock and/or misfeeding of the stock in combination; the provision of novel roll feed adjustment means which require but a minimum of easily assembled and maintained parts; the provision of novel photoelectric feed control means employed cooperatively with other novel roll feed adjustment means to provide perfect registry in a machine at all times; and .a provisional roll feed adjustment means the use of which will increase the efficiency and reliability of a press so equipped. v

To the accomplishment of the foregoing and further related objects, saidinvention comprises the means here inafter fully described and particularly pointed out in theclaims; the annexed drawings and the following description setting forthin detail certain structure embodying the invention, such structure however, being merely illustrative of various forms in which the principle of the invention may be used.

Figure 1 is a schematic elevational view of a preferred embodiment of the invention showing an adjustingimeans mounted on a press crankshaft crank block;

Figure 2 is anenlarged fragmentary View of the adjusting means shown in Figure 1;

Figure 3 is a sectional view of the adjusting means taken substantially along the line 3-3 of Figure 2;

Figure 4 is a schematic elevational view of another pre ferre d'embodiment of the invention showing an adjusting means mounted for coaction with a pressbackshaft, cross shaft, or the like;

Figure 5 is an enlarged fragmentary view of the em bodiment of the invention shown in Figure 4, partially sectioned, to'bettershow the interior construction;

Figure 6 is a top plan view of the embodiment of the invention shown in Figure 5; and,

Figure 7 'is aside elevational view, partially sectioned, of the embodiment of the invention shown inFi gure 5.

Reference is now madelto the drawings 'in greater detail and, in particular, to Figure 1.

A preferred embodiment comprises a roll feed adjustment 10 secured to the end portion 12 of the crankshaft Mot apress. A pin'l'dis adjustably secured toa circular crankblock or base mounting plate 18 to receive thereon the yoke portion 20 of a connecting rod .22. The lower end 24 of the connecting rod is pivotally secured to an extended armportion 26 of a bell crank 28. The other arm 30 of. the bell crank 28 is pivotally securedjto a train; mel bar 32 which'pivotally connects apair of

feedrolls

34 and 36 through

ratchet arms

38 and 40 to intermittently rotate these rolls. on ratchet means (not shown) of any suitable construction. so as to intermittently rotate the rolls 3413.!!(1 .36

one direction only, namely, the direction of the feed cf

Arms

38 and 40 aremounted.

stock S in the press. A pair of

upper rolls

42 and 44 are positioned above adjacent

lower rolls

34 and 36, respectively, to grip stock therebetween and assist in advancing the stock beneath the punch 46 and die 48.

The base plate or crank block 18 (see Figures 2 and 3) is provided with a collar or sleeve 50 adapted to slip over the end 12 of the press crankshaft 14 to which it may be securely-fixed. The pin 16 is rigidly secured to a non-rotatable nut 52 threaded onto a rotatable shaft 54 journaled on opposite ends in

plain bearings

56 and 58 fastened to the base plate 18. A small fractional horsepower motor 60 is bolted to the crank block 18 and has a worm 62 (see Figure 3) integrally secured to the end of the rot-or shaft 64 projecting normal to the threaded shaft 54. A worm wheel 66 is secured to one end of the threaded shaft 54 for meshed engagement with the worm 62, so that energization of the motor 60 will rotate the worm 62 and wheel 66 to drive the threaded shaft 54 and traverse the non-rotatable nut 52 radially with respect to the axis of the press crankshaft 14.

A light source 68 is mounted above the path of the strip S being fed into the press to cast a beam of light on the surface of the strip. Registration or indexing marks 70 are printed at regular intervals along the margin of the strip S to receive the beam of light from the light source 68 and reflect it toward one of a pair of

photoelectric scanning eyes

72 and 74 also mounted above the path of travel of the material being fed into the press. A suitable limit switch means 76 is provided to energize the motor 60 only after the material has come to rest at its forwardmost position, this period occurring when the

ratchet arms

38 and 40 are passing through the return stroke prior to advancing the material one additional position. However, as an alternative embodiment it may prove expedient under certain conditions to use switch 76 for energizing light source 68 instead of the motor 60. The limit switch 76, as shown in Figures 1 and 4, is positioned to be actuated by a cam 78 secured to the periphery of the circular crankblock 18. As an alternative arrangement, the limit switch may be located adjacent to and actuated by an attachment to the feed drive oscillating shaft 80, or the mechanisms reciprocated thereby. The registration marks 70 are so positioned that when the machine is properly adjusted they should come to rest at a position 71 intermediate that which would reflect light into either the over-scanning eye 72 or the under-scanning eye 74.

Assuming that a press is properly adjusted when it begins operating, the feed rolls may over a period of time underfeed the material a slight amount which is additive during each stroke until the registration mark is no longer advanced to the intermediate normal position 71 described hereinabove. More significantly, the patterns on lithographed sheet material may be irregularly spaced, or a combination situation may develop wherein the lithographed patterns are not only irregularly spaced but the feed rolls may also under feed or over feed the stock. In any event, the registration mark will reach a position with respect to the light source that the reflection of the light source on the registration mark will reflect the beam 82 into the under scanning eye 74. This reflected beam will then energize the under-scanning eye 74 to close an appropriate circuit in control box 84, which, in turn, will energize the electric motor 60 to rotate in a predetermined direction. The electric motor 60 by rotating in said direction increases the eccentricity of the pin 16 with respect to the axis of the crankshaft 14. The stroke of the roll feed adjustment mechanism will then be increased sothat progressively the registration mark 70 on the strips will be advanced forwardly to the intermediate position.

If the feed is over-corrected, the registration mark will then be advanced until it finally reflects beam 88 from the light source 68 into the over-scanning eye 72. The

energize the electric motor 60 causing it to rotate in the opposite direction, whereupon the eccentricity of the pin 16 with the axis of the crankshaft 14 is reduced, thereby shortening the stroke of the roll feed mechanism until the registration mark 70 has been once again zeroed in.

The foregoing discussion has been based on the assumption that the registration marks 70 have higher reflection properties than the surrounding background. There may be circumstances created by the particular design or coating on the material whereby a dark marking of lower reflectance than the surrounding material must be used as the registration mark. In this case, the circuit would be adapted so that the scanning eyes would work in the reverse manner, that is, in the normal situation, both eyes would be energized by the reflected light and if the registration mark shifts from position 71 sufiiciently to interrupt the energization of a scanning eye, the appropriate control circuit will adjust the feed mechanism back to the normal position.

It will be seen, therefore, from the above discussion of the invention that the adjustment process is continuous so that the feed of strip S is controlled within allowable tolerances at all times. With respect to this first discussed embodiment of the invention, appropriate leads 90 and 92 from control box 84 supply current to crankshaft slip rings 94 and 96 which are connected to motor 60 (see Figure 3) by leads 98 and 100. It will be understood that other members of slip rings may be employed depending on the particular circuit used to energize the motor 60. No discussion of the wiring circuits contained in control box 84 and adapted to energize the electric motor 60 for clockwise and counterclockwise rotation has been made since it is recognized that such circuits are well known and do not constitute a part of this invention per se.

Another preferred embodiment of the invention is shown in Figure 4 wherein the stroke adjusting mechanism is incorporated adjacent the trammel bar 32 rather than the press crankshaft 14 (see Figure 4). In this embodiment, the crank block 102 is fitted over the end of the crankshaft in much the same manner as the base plate 18 shown in Figure 3, but it carries thereon a pin 104 which is adjustably secured for coarse feed adjustment to the base plate eccentrically with respect to the axis of the press crankshaft 14. A yoke 106 of a connecting rod 108 is received over the pin 104 for pivotal movement thereon. The lower end of the connecting rod 108 is fitted with a a socket 109 to pivotally receive a ball 110 therein to form a worm 124 (see Figure 7) secured to its rotor shaft over-scanning photoelectric eye 72 then closes a circuit to.

126 journaled on the opposite side of the casing from the motor mounting. The worm 124 threadedly engages the worm wheel 118 to traverse the threaded shaft 114, moving the ball and socket joint outwardly and inwardly with respect to the housing 121. The housing 121 is suitably mounted for pivotal movement on any convenient feed drive oscillating shaft which, if desired, may laterally transfer oscillatory motion from the housing side of the shaft to the opposite side of the press where the roll feed mechanism may be operated. In any event, whether the motion of the housing 121 is adjacent to the opposite side of the press or to the near side, an arm 128 comparable to the arm 30 of the bell crank 28, shown in Figure 1, is provided to pivotally connect with the aforedescribed trammel bar 32. This arm 128 may be in-. te grally secured with the housing 121 or may be in-.

tegrally secured to the backshaft 80. In either case the function and operation will be the same. i I

The energization of the electric metor 122 is. identical to that of electric motor 60 discussed with regard" to the first mentioned preferred embodiment of the invention. However, the change in stroke of the roll feed adjustment is obtained by increasing or d'ecreasingthe length of threaded shaft 114 extending outwardly from the center line 130 (see Figure'4) of the housing 121 toward the connecting rod 108. Accordingly, the eccentricity of the pin 104 does not require the compensating adjustment during operation but the lever arm at the lower end of the connecting rod 108 is adjustable to provide the necessary correction in the feed of the press.

It will be seen, therefore, that whether the stroke adjustment of the workfeed mechanism is obtained at the crank block 18, or at the feed drive oscillating-shaft 80, the necessary adjustments are being continuously made throughout the operation of the press to enable the production of a high percentage ofacceptable workpieces.

It is to be understood that while two preferredembodiments of the invention are shown herein, these embodiments are by way of example only and are not to be construed in a limiting sense. Other similar arrange ments and modifications will occur to those skilled in the art and may be resorted to Without departing from the spirit and scope of the invention.

We claim:

1. In a feed device for intermittently feeding sheet material into a metal working press adapted to perform work thereon, the improvement in feed adjustment means comprising: a light source adapted to project a beam of light on sheet material being fed through said machine; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed mechanism to feed a predetermined length of said sheet ma; terial at each cycle of said machine; and electric motor means adapted to vary the length of feed of said sheet material in response to a signal from said photoelectric scanning means.

2. In a feed device for intermittently feeding sheet material into a metal Working press said sheet material having regularly spaced indexing marks thereon, the improvement in feed adjustment means comprising: a light source adapted to project a beam of light on sheet material being fed through said machine; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a feed mechanism to advance a length of said sheet material substantially equal to the distance between said indexing marks; and electrical motor means adapted to vary said length in response to a signal from said photoelectric scanning means.

3. The apparatus set forth in claim 2, including switch means synchronized with the cyclic operation of said machine to energize said electrical motor means for a predetermined portion of each cycle of operation.

4. In a metal working press including a feed device for intermittently feeding sheet material into said press, the improvement in feed adjustment means comprising: a light source adapted to project a beam of light on sheet material being fed through said machine; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed rolls; means to reciprocate at least one of said feed rolls; an adjustable crank arm drivingly connected to said feed roll reciprocating means; and an electric motor adapted to vary the length of said adjustable crank arm in response to a signal from said photoelectric scanning means.

5. A photoelectric scanning device for controlling the intermittent feed of sheet material, said sheet material having regularly spaced indexing marks thereon adapted to vary the intensity of reflected light, comprising: a light source adapted to project a beam of light on said sheet material; a feed mechanism adapted to intermittently 6 fe d a d sh et m te al; a ai Q hotoele r c .e dap d t c en r ized b ish cfle i om Said sheet material; circuit means responsive to a signal from said p wf sleflriw l adap ed 9 a y h feed stroke of said feed mechanism; and switch means synchronized with the cyclic operation of said feed mechanism to energize said circuit means at a predetermined point in each cycle of operation.

6. A photoelectric scanning device. for controlling the intermittentfeed ofsheet material, said sheet material having regularly spaced indexing marks thereon having a coeflicient of reflection substantially different from the background, comprising: a feed mechanism adapted to intermittently feed said sheet material; a light source adapted'to project a'beam of light on said sheet material; a-pair of photoelectric cells linearly spacedalong a line parallel to the direction of feed of said feed mechanism and adapted to be energized by lightreflectcd from said sheet material, said pair of photoelectric cells being so positioned that the reflected image of an indexing mark is normally midway between said'cells when said light source is energized; control circuit means adapted to vary the length of stroke of said feed mechanism when said image falls on one of said cells to return said image to its normal position between said photo cells; and switch means adapted to energize said control circuit means at a predetermined point in the cycle of operation of said feed mechanism.

7. In ametal Working press including a feed device for intermittently feeding sheet material into said press, the improvement'in feed adjustment means comprising: a light source adapted to'project a beam of light on sheet material being fed through said press; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed-rolls; means to reciprocate at least one of said feed rolls; a reciprocable bell crank mounted on said press and having one arm thereof drivingly connected to said feed roll reciprocating means; a shaft drivingly connected to said press; a connecting rod drivingly connected at one end to the other arm of said bell crank and eccentrically connected at its other end to said shaft; connecting rod throw adjusting means; an electric motor adapted to operate said throw adjusting means; switch means synchronized with the cyclic operation of said press to energize said light source at a predetermined period in each cycle of operation; and means to energize said electric motor responsive to the energization of said photoelectric scanning means.

8. In a metal working press including a feed device for intermittently feeding sheet material into said press, the improvement in feed adjustment means comprising: a light source adapted to project a beam of light on. sheet material being fed through said press; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed rolls; means to reciprocate at least one of said feed rolls; a reciprocable hub member mounted on said press having an arm extending therefrom and drivingly connected to said feed roll reciprocating means; a threaded shaft extending from said hub member; a driveshaft driven by said press; a connecting rod drivingly fastened at one end to said threaded shaft and eccentrically fastened at its other end to said driveshaft; said threaded shaft being adjustably engaged in said hub; a worm wheel in said hub threaded on said shaft; an electric motor mounted on said hub; a worm driven by said motor to rotatably engage said worm wheel; switch means synchronized with the cyclic operation of said press to energize said light source at a predetermined period in each cycle of operation; and means to energize said electric motor responsive to the energization of said photoelectric scanning means.

9. In a metal working press including a feed device for intermittently feeding sheet material into said press, the improvement in feed adjustment means comprising;

a light source adapted to project a beam of light on sheet material being fed through said press; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed rolls; means to reciprocate at least one of said feed rolls; a reciprocable bell crank mounted on said press and having one arm thereof drivingly connected to said feed roll reciprocating means; a connecting rod drivingly fastened at one end to the other arm of said bell crank; drive shaft drivingly connected to said press; a connecting rod throw adjusting means including a housing secured to one end of said drive shaft normal to the drive shaft axis and concentric therewith; a screw journaled in said housing; a nut threaded on said screw and having a stub shaft extending therefrom to receive the other end of said connecting rod thereon; a worm wheel secured to one end of said screw; a worm drivingly connected to said worm wheel; a motor adapted to drive said worm wheel; a motor adapted to drive said worm; and means to energize said motor responsive to the energization of said photoelectric scanning means.

10. In a metal working press including a feed device for intermittently feeding sheet material into said press, the improvement in feed adjustment means comprising:

a light source adapted to project a beam of light on sheet material fed through said press; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed rolls; means to reciprocate at least one of said feed rolls; a reciprocable bell crank mounted on said press and having one arm thereof drivingly connected to said feed roll reciprocating means; a shaft drivingly connected to said press; a connecting rod drivingly connected at one end to the other arm of said bell crank and eccentrically connected at its other end to said shaft; connecting rod throw adjusting means; an electric motor adapted to operate said throw adjusting means; circuit means adapted to energize said electric motor responsive to the energization of said photoelectric scanning means; and switch means synchronized with the cyclic operation of said press to connect said electric motor to said circuit means at a predetermined period in each cycle of operation.

11. In a metal working press including a feed device for intermittently feeding sheet material into said press, the improvement in feed adjustment means comprising: a light source adapted to project a beam of light on sheet material being-fed through said press; photoelectric scanning means adapted to be energized by light reflected from said sheet material; a roll feed including a pair of feed rolls; means to reciprocate at least one of said feed rolls; a reciprocable hub member mounted on said press having an arm extending therefrom and drivingly connected to said feed roll reciprocating means; a threaded shaft extending from said hub member; a driveshaft driven by said press; a connecting rod drivingly fastened at one end to said threaded shaft and eccentrically fastened at its other end to said driveshaft; said threaded shaft being adjustably engaged in said hub; a worm wheel in said hub threaded on said shaft; an electric motor mounted on said hub; a worm driven by said motor to rotatably engage said worm wheel; circuit means adapted to energize said electric motor responsive to the energization of said photoelectric scanning means; and switch means synchronized with the cyclic operation of said press to connect said electric motor to said circuit means at a predetermined period in each cycle of operation.

References Cited in the file of this patent UNITED STATES PATENTS 2,653,023 Russell et al. Sept. 22, 1953