US1571967A - Stamping mechanism for evening and grading machines - Google Patents

Description

Feb. 9 1926. 1,571,967

W. T. B. ROBERTS ET AL STAMPING MECHANISM FOR EVENING AND GRADING MACHINES Filed May 14. 1924 fthrough the machine Patented Feb 9, was;

'VUNITED STATES PATENT OFFICE.

WILLIAM r'nomas BticKmdnAM nonnars AND ran-n RICKS, or nnrensrnn, ENG- I Ji.hl'13, ASSIGNORS TO UNITED SHOE MACHINERY CORPORATION, OF

NE'VV JERSEY, A CORPORATION OF NEW JERSEY.

PATERSON,

STAMPING MECHANISM FOR EVENING AND GRADING MACHINES.

Applicationfiled May 14, 1924. Serial No. 713,227.

BUCKINGHAM Ronnn'rs and FRED Ricks, subjects of the King of England, residingat Leicester, Leicestershire, England, have invented certain Improvements in Stamping Mechanism for Evening and Grading Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters onthe drawings indicating li e parts in the several figures. i Y,

wflhis invention relates to stamping mecha nism and is herein illustrated as embodied in a machine for stamping soles or similar blanks with sunken numerals to indicate the respective thicknesses of the thinnest spots of said soles or other blanks. Y

A machine of this general type is shown and described in Patent No. 8 ll,809, granted January 22, 1907, upon an application tiled in the name of Nichols In that machine there is provided a stamping wheel having numerals on itsperiphery and capable of beingadjusted about its axis to bring the desired numeral into operativeposition. The blank first passes between feeler rolls one of which rises and fallslin response to thicker or thinner spots encountered in the blank; and this rising and falling roll is so vconnected with the stamping wheel that said wheel is adjusted into a-position to cause that numeral on its. periphery, which representsin a selected unit of measurement the thickness of the thinnest spot in the blank, to be brought into lowermost, operative position.- 'The blank, after having passed from between the teeler rolls, cc: rried beneath the stamping wheel and at which. time a cam is rotated by which the wheel is normally held in raised position against the urge of a spring-actuated driver, Rotation of the cam causes the stamping wheel to be brought down forcibly upon the work by the driver and then to be raised again into position to beadjusted by the passage of a succeeding blank through the :teeler rolls. Blanks are thus fed one by one moving. I

In machines of this type, certain undesirable results sometimes occur. The numeral impressed uponthe blank may be blurred owing to too long a contact of the. numeral and stamped while on the stamping wheel with the blank or owing to double stamping due to an uncontrolled rebound or chattering of the stamping wheel. may break certain parts of the machine, for example the cam which releases the wheel for its downward stroke and then raises it. Again the depth of the numerals stamped And this uncontrolled rebound upon the blanks, and consequently. the dis- 7 tinct-ness of the numerals may vary with blanks of different thicknesses by reason of the fact that the spring-actuated driver exerts its force during the entire stroke of the stamping member so that a blow of considerably more force is struckupon a thin blank than upon a thick one...

The, generalobject of the present invention is to obviate these and other disadvantages.

A According to one feature of the present invention, the application of force to the .stamping member to drive it toward the work terminates before the stamping member reaches the work. In the illustrative machine the movement of the driver, by which theyfo-rce is applied to the stamping member, is arrested before the stamping member contacts with the work,-the stamping member completing its movement alone under the impulse imparted to it by the driver. This impulse being always the same, the force with whichthe stamping member strikes the work is "thus substantially uniform irrespective of variations in the thickness ofthe work'or at least substantially uniform within the limits of variation in thickness encountered in sole blanks and similar articles. a V

Inmachines of this kind,as has been explained above, the stamping member frequently rebounds from the work and comes down a second time before it is raised by the cam. In order to obviate the tendency to blur the numeral stamped upon the moving blank when there is such second descent, means are provided, in accordance with another feature of the invention, for raising the stamping member quickly from the wor r and holding it raised. In the illustrative machine, a spring is located between the carrier of the stamping member and the frame of the machine in position to be compressed during thestamping stroke ofthe carrier. This spring not only prevents the till double stan'iping referred to above. but ensures that the stamping member shall not dwell upon the moving work and also obviates the tendency which formerly existed to the breaking of the lifting cam by the uncontrolled rebound or chattering of the carrier oi the stamping member.

These and other features of the invention including certain details ol construction and combinations of parts will he described as embodied in an illustrative machine and pointed out in the appended claims.

Figure l o l the drawings is a Front view partly in elevation and partly in section of a portion oi a machine in which the present invention is embodied, and

Figure 22 is an elevation of part ot' the eonsti'iwtion shown in liigure 1 viewed from the left.

Only the stamping mechanism and a por' tion oi the bed of the machine over which the blanks are fed have been shown since otherwise the machine is or may he substantially the same asthe machine of Pat out No. 1,182,105, granted hlay 9, 1916, upon an application filed in the name of Roberts. It will be understood that each blank first passes through a feeler mechanism which operates to turn the stamping, wheel into a position such that when the stamping wheel is later brought down upon the blank it will indent the blank with the proper numeral to indicate the thickness of the thinnest spot in a selected area or 10- ealit v of theblank encountered by the feeler mechanism. This feeler mechanism is located in. front of the stamping wheel 1, as viewed in Figure 1; and the blank, after it leaves said mechanism, is fed beneath the fitllll'lpll'lg wheel toa splittiiu, or evening mechanism located behind the stamping wheel. The stamping wheel is norn'ially held in raised position above the bed 3 against the force of a spring-aetuated driver Frbv a cam 7 carried at the outer end of a rotary shaft 5), the spring which urges the driver dmvnwardlv at all times about the pivot 12 being: imlicated at ltl. While the blank is passing: beheath the stamping wheel 1, a clutch is automatically thrown in to impart one revolution to the shaft 9 and cam T with the result that the stampin; wheel is forcibly brought down upon the blank by the action of the spring driver a and is then raised once more by the cam into the position shown. As thus far described, the mechanism is or may be the same as in the machine oi Patent No. .l,lt-i2.l(l5, referred to above.

The stamping wheel 1 is mounted in a carrier 1-lwhich is slidable in vertical guideways in the frame of' the machine. At its upper end is a cup-shaped member 1?) which receives the lower, rounded end of a rod 15, the upper end of said rod being received in a similar cup-shaped member 16 carried at the outer end of the springactuated driver 5. Formed on the under side of the driver 5 is a hardened face 17 which, when the driver swings dowmvard- 1 contacts with an adjustable stop 1.9. The driver is thus arrested in its downward movement before the stampiiur wheel reaches the blank, but the carrier 1 1: eontinues its downward movement under the impetus given to it by the driver. Downward movement of the carrier compresses a spring 52L which is mnsiderably weaker than the spring in but is strong enough to raise the carrier. The carrier. lunvover, usually rebounds, and the principal funclion oi the weaker spring is to prevent the carrier from immediately descending a Second time whereby a blurred mark would result upon the blank. The spring 21 at its lower end rests upon lllQlNlilOlfl of a socket formed in the frame of the machine, and at its upper end engages the under side of a brarket 23 which is fastened to the carrier 14:. A. pin 25 carried by the bracket extends into the coils of thespring and serves to prevent the spring" from being displaced. lhe stop Iii! is vertically ad iustable by reason ol: the tart that its stem threaded into a socket; Formed in the frame of the machine. chock nut 27 holds it in adjusted position.

Referring: now more particularly to Figure 2, the direction or rotation of the cam T is indicated bv the arrow. Normally the trailing end 20 engages the under faceof a hardened block 3]. which is fastened to the carrier 14: and thus holds the carrier, and with it the stamping; wheel, in raised position. When, in the course of the operation oi the machine, a blank passes beneath the stamping wheel and one revolution is imparted to the cam, the trailing end 39 oi the cam passes out from beneath the block 31 whereupon the driver 5 instantlp causes the carrier 14:, and with it the stamping); wheel, to be moved forcibly downward to mark the blank. The carrier then instantly rises, either by reason oi its rebound or by reason of the action of the spring" ill or by reason of both; and thereafter, during the con'ipletion ot the rotation oi the cam T. the lifting end 32- thereol'i contacts with theunder taco of the hardened block 31 and raises the can ricr and stamping wheel against the force of the spring; 10, the parts coming to rest in the positions shown with the trailing end of the cam ennagrino the block 31..

The driver 5 thus has a fixed rangeoi movement. such movement being arrested before the stan'iping" wheel contacts 'with the work. As soon as the driver contacts with the stop 19 the application of force to the stamping wheel terminates, the remaining downward movement of the stamping wheel being due to the'impulse imparted to it by the driver. wheel has struck and marked the blank, it may rebound, being assisted in this rebound by the action of the spring 21 which was compressed by the downward move we claim as new-and desire to secure by Letters Patent of the United States is stamping member, a driver therefor, a spring adapted to urgethe driver in a direction to impart stamping movement-to the stamping member, means for normally holding the stamping member in raised position against the force of the driver spring, said means being. adapted to be moved to release the stamping member and thereby permit the driver to impart a stamping stroke to the stamping member, and a stop for arresting the movement of the driver before the stamping member completes its stroke.

2. In a machine in which a blank is moved past stamping mechanism and stamped while moving, a stamping member, a carrier therefor, a driver, a rigid member having one portion in contact with the driver and another portion in contact with the carrier, a comparatively heavy spring urging the driver in a direction to actuate the carrier,

means for raising the carrier against the force of the spring and for thereafter releasing the carrier to permit the (ll'lVBll to operate. a stop to limit the extent of movement of the driver which follows release of the carrier, and a lighter spring for raising the carrier innnediately after thestamping operation has been completed.

3. In a machine of the class described, a stamping member, a driver therefor, a spring adapted to urge the driver in a direction to impart stamping movement to the stamping member, means for normally holding the stamping member in raised position against the force of the driver spring, said means being adapted to be moved to release the stamping member and thereby permit thev driver to impart a stamping stroke to the stamping member, and a stop for arresting the movement of the driver before the After the stamping stamping member completes its stroke, said stop being adjustable to vary the extent of the path of movement of the driver.

a, In a machine of the class described, a stamping member, a spring for urging the stamping member toward the work, means for raising the stamping member and thereby putting the spring under tension and for normally holding the stamping member in raised position, means for tripping the stamping member whereby driving force is applied to said member by the spring, and means for terminating the application of the driving force before the stamping member reaches the work.

5. In a machine in which a blank is moved past stamping mechanism and stamped while moving, a stamping member, a driver therefor, a springnormally exerting force upon the driver in a direction to cause the stamp- 1. Ina machine-0f the class described, a,

ing member to move toward the path of movement of the blank, means normally holding the stamping member spaced from said path against the force of the spring,

means for operating-the holding means to ing said member in raised position above the bed, a driver having a separable connection with the stamping member, a spring urging the driver and with it the stamping member downwardly, means for moving the holding means to release the stamping member, and a stop for arresting downward movement of the driver before the stamping member cont-acts with the work.

7. Ina machine in which a blank is moved past stamping mechanism and stamped. while moving, a bed over which the blank is fed, a stamping member, means for normally holding said member in raised position above the bed, a driver having a separable connection with the stamping member, a spring urging the driver andwith it the stamping member downwardly, means for moving the holding means to release the stamping member, and a stop for arresting downward movement of the driver before the stamping member contacts with the work, said stop being adjustable to vary the locality at which the movement of the driver is arrested.

In testimony whereof we have signed our names to this specification.

WILLIAM THOMAS BUCKINGHAM ROBERTS. FRED RICKS.

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