US633895A - Machine for grinding surfaces of metals. - Google Patents

Description

"0.333,895. Patented sept. 2s, |899.

s. w. PAcKEn. MACHINE FUR GHINDING SURFACES 0F METALS.

(A.pp1ic|.tion led Kay 20, 1889.) (Ilo Model.) w 5 5 Sheets-Sheet l,

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No. 633,895. Patented Sept. 26, |899. E. Vl. PACKE'R.

IACHiNE F08 GENUINE SUBFACES GFIETALS.

(Appliucion med my 2o, 189e.)

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INVENTOR Patented Supt. 26, |399' a. w. Mcm-zn. IGHIKE FOR GMIDING SURFES 0F IETLS.

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. no. 633,895. Patented sept. 2s, 1899.

a. w. PAcKl-n. MACHINE FOR GBINDING SUM-'ACES UF METALS.

(Application filed Hay 20, 1899.) (llo I`odal.) 5 Sheets-Sheet 4. l

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Patented Sept. 26, |899. G. W. PAGKER. v MACHINE FUR GBINDING SUBFADES 0F METALS.

(Application lei my 20, 1899.)

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PATENT Fries.

GEORGE ritenne, on oni-caso, ILLINOIS.

` MACHINE Foa GRINDIVNG eURI-ACES oF METALS, l;

srnoinlca'rxonforming part 'or Lectersratent No. 533,895, dated september 2e, ieee.`

Application filed my 20,1899.' sennuanimre. oramai.)

To ctZZ whom it may concern,.- A

Be it known that I, GEORGE NV. PACKER, a citizen of the United States, residing at Chicago, in the county of Cook and State of .Illinois, have inventedcertain new and useful Improvements in Machines for Grinding Surfaces of Metals; and I do hereby declare the` v following to be a full,clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

Figure 1 is a plan .view of my machine; Fig. 2, a side elevation; Fig. 3, an end elevation; Fig. 4t, a section alview of feeding device. Fig. 5 is a side elevation of thatpor-V tion of the machineV having -to do more par ticularly with feeding and grinding the sections of cutters ofharvesting-machines. Fig. 6 is aperspective view of a portion of the cross-carriage. Fig. 7 is a plan viewot' the section-feeding devices, and Fig. 8 is a front 'elevation of the said section-feeding devices. Figs. 9 and10 show details of the cross-cav` riage. Figs. l1, .12, 13, and 14 are details ofl the chuck and carriage. Figs. 15, 16, 17, and 18 are details of the universal support for the blank. Fig. 19 is a detail of the arm for holding the blanks in the chute.v Figr20 is a detail of the plate secured to the side of the chute and its connected parts. Fig, 2l shows in detail the means for roughing the surface of the'grinding-wheel.Y Y v l The object of my invention is to provide a machine that shall automatically accomplish the work of grinding the surfaces of parts cut from sheet metalthat may be placed' therein; and its nature consists inv providing ,a feeding-hopper into 'which' the parts to be ground may be stood, in means for moving the said parts to positionto be taken' bya' carrier and moved across the surface of a grinding-stone, and in providing various devices for accomplishing the work in the most perfect manner.

rlhe machine is shown as particularly adapted to the grinding o f vsickle-sections for harvesting machinery.

In the drawings, A is a discoidal grindingstone hollowed out at its centenas shown in dotted lines, across thefac'e of which the sections are moved by a cross-'carriage B, a chuck in which takes them from the hopper C andl a beltf4.

4the belt g. pinion g2, adapted to mesh into the gear e moves them forth-and back over the face of the stone.v The cross-carriagev B .moves on guideways supported upon the carriage D,

vwhich is adjustable in such a manner that the saidV carriage may follow vnpthe stone as the latter wears away. The carriage 'is moved by a. crank formed upon the shaft E. All of these parts are suitably mounted upon a strong yframe F.

The construction and operation may best be made clearby referringV -to the various partsin detail and thendescribing their cooperations whereby the results are produced.

-Mounted'upon the main frame F are the pillow-blocks f and f, in which is journaled the shaft f 2, carrying the face-platefuto which -the grinding-,stone A is firmly secured. Upon theV shaft is a suitable pulleyfrotated hy Upon the shaft is also the small pulleyf. Upon a counter-shaft G,Fig. 3, immediately below the shaft E is the pulley g, around which and the pnlleyy"5 is thrown Upon the counter-shaft G is the upon the shaft E. Upon the latter shaft is a crank-Wrist c', secured in the disk e2. Extending from this Wrist to the cross-carriage is the pitman e3, pivoted at c4. The pitman at each end is secured to the wrists by means otuniversal joints, so as to have an abundance of freedom of movement. By movementv of the shat'tf2 it is thus seen that the grinding-stone and the cross-carriage are given Vthe desired movements relative to each other. 'As stated, the cross-carriage is supported upon the main carriage D and by the latter is movedA to compensate for the Wearing away of the grinding-stone. lln order that. it may so move, the gear e is keyed to the grooved shaft insuch a manner that the shaft is free to slide therethrough. The main carriage D is supported upon the frame F and guided by the racks d and d', suitably secured to the latter. Upon the shaft d2 are keyed the pinlions d3 and d4. Upon the end of the shaft d2 is secured by ratchet h and upon the lever H a pawl h', and also the adjustable' Weight h2. The purpose ot' the weighted lever is to move the carriageD toward the grinding-stoneand maintain it there under yielding pressure.

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After the stone has become worn itis necesi sary, of course, to raise the lever H and adjust the pawl h to a new tooth of the ratchet.

As there is an interval, for reasons soon to be explained, when there is no section being ground, the main carriage D would be free to move toward the stone were not means provided for preventing the same. Such means consist in the conical roller I, supported upon a stationary pin held in the bracket t' upon the carriage D.

As a certain degree of roughness is required on stones for this purpose, a many-toothed roller K (see Fig. 2l) is journaled in a support pivoted upon the cross-carriage. (See Figs. 1, 2, 3, and 2l.) Horizontally through an upreaching part of the cross-carriage is a hole k, (see Fig. 5,) th rough which passes the pin k', Fig. 2l. The toothed roller K and its connected parts are omitted from Fig. 5 to avoid complicating the drawings and to show parts beyond. This pin serves as a pivot for the framework k2. Upon the pin 7c3 are several toothed disks,which const-itute what may be termed the roller K. It is of disks in order that it may be more easilymanufactured, and also that the parts may rotate at diiferentrates of speed, the said rates depending upon the radial distance from the axis of the grinding-stone. Across the upper part of the frame k2 is the pin 164, suitably supported, and to this is connected the screw-rod h5. Surrounding the screw 705, Fig. 21, however, is the doubly-flanged sleeve los, which passes through the slot Z3 in the upwardly-directed projection Z4, having any suitable means for rotating it-as, for instance, a hand-wheel k7, as shown. The flanges upon the sleeve 766 prevent the latter from moving longitudinally. By turning the hand-wheel the roller K may be moved to position to act upon the wheel and give the desired roughness by the points pecking into it.

The devices for feeding the sickle-sections or whatever parts the machine is adapted to grind are shown in the various detailed figures.

The cross-carriage may be better understood by referring to Figs. G, 7, and 8. It consists, preferably, of a single casting having certain parts secured to it. In the perspective View Fig. 6, L is the main portion of the cross-carriage. This rests upon the main carriage at D, where suitable guideways C17 and da are provided. tion to the minimum, the cross-carriage is provided with the rollers ZZZ. Upon the crosscarriage are the lugs l and Z'. Between these the end of the pitman c4 is secured by Aa suitable pin Z?, upon which it may oscillate. The rotation of the crank e', it will thus be seen, gives the cross-carriage the necessary reciprocating movement to carry the sections held by its chuck across the face of the grindingstone. In order to hold the cross-carriage down, a roller Z5 is secured thereto, adapted to run under a guide m on the main carriage In order to reduce fric-- ceases D, as shown in Figs. 5 and 10. In order to reduce friction,all of these rollers are provided with antifriction-bearings consisting of rollers, as shown in Fig. 10.

The feeding devices may bebest studied in Figs. 1, 2, 4, 5, 6, and 8.

C is ahopperin which the sections are stood, its width being such as to confine the said sections within reasonable limits. The bottom of this trough-like hopper is slotted. Within the trough is adapted to move the feeder c, connected to which and extending through the slot is a stud-bolt c. To the latter is secured the chain c2, which, passing around the rollers c3 and c4, is attached to the Weight c5, which through the instrumentality of the chain and the feeder applies constant pressure to the assembled sections within the troughlike hopper. The feeder is provided wiiha handle c6, by which it can be moved back when the operator wishes to put a new supply of sections in place. Upon the face of the crosscarriage are the ledges p and p', which form a kind of chuck, (see Fig. 6,) which are adapted to grasp a section as the carriage recedes. As the carriage moves forward the section is carried along the face of the stone. The ledges p and p' are the ends of a plate P, bent to form the same,p', as shown in Fig. 1I. These pass all the Way through the cross-carriage, as shown in section in Fig. 14. This angled plate P is made adjustable by means of the screws p2 and p3. (See Figs. 8, 9, 10, and 14 and as shown in detail in Fig. 11.)

As grinding-stones wear away more in some places than others, the surfaces often lack -mathematical correctness, and the sickle-sections or other parts cut from sheet metal are often somewhat warped. As absolute uniformity in thickness is not always necessary, but, on the contrary, the production of a perfectly-plain surface being required the part of the cross-carriage which lies behind the section and constitutes a chuck, holding it in position while being ground, is pivotally supported, as will be duly described.

To the main portion of the cross-carriage, against the vertical plane r (shown in the perspective view Fig. 6) is the plate r', Figs. 16 and 9, having as one piece therewith the hemisphere r2.. This plate is secured by any suitable means to the cross-carriage in the position stated.

R, Fig. l5, is a plate of metal provided with a socket adapted to fit onto the hemisphere r2. (Shown in the two views in Fig. 16.) The hole in the hemisphere is threaded and adapted to receive the screw r3, (shown in Fig. 18,) which also passes loosely through the eye 'r4 in the plate R, Fig. 15. A spring 1*5 is placed upon the screw merely for the purpose of holding the two parts of what may be called a ball-and-socket joint in proper relative position, yet with sucient freedom that the planes of the two plates which the ball and socket connect may vary relatively.

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ceases v f 't s is a slot into which the linger s drop-s when a section is discharged from the hopper C into the carriage B.v

S is a plate of metal, secured to the plate R,

'tion heldin the position shown in dotted lines,

Fig. 6, the plate S when the cross-carriage B is moving across the stone may be free to adjust itself so that its plane may conform as nearly as possible to the plane of the grinding-su rface of the stone whether the latter be a perfect plane or undulating on account of some portions wearing more easily than others. The method of securing the plate S, against which the section rests when being ground, by means of ball-and-socket joint is shown in detail in Fig. 14. The method of securing the rollers to the carriage is shown in Fig. 13, where an oil-tube t is provided for suitably lubricating the antifriction-rollers.'

In the plan view in Fig. 7 is shown a bar U beside the trough-like hopper. Itis provided with two slots u, as shown in Fig. 20, through which screws u' pass and secure it to the said hopper. A spring u2 is secured .to the main frame and adapted to press against the part its of this slide. Upon the slide is the plate n4, having the right-angled end 'a5 and the inclined end n.

Turning now to Fig. 2, it will be seen that as the carriage moves a section forward it must pass the plate M4, which it freely does because of the fact that the edge u, which it rst reaches, is beveled. The springyielding, as it does, permits the section to pass freely; but upon thepreturn of the cross-carriage the section is forced against the rightangled edge a5 of the plate and pushed out of the recess in the cross-carriage which sustains the section during the operation of grinding and drops away. The ledge p (shown in Fig. 6) is (see Fig. 4) immediately below the section next to be taken, (marked s2.) To a lug projecting from the trough-like hopper is pivoted the finger s', adapted to press against the column of sections at intervals and force them backward. Its movement for rthe purpose is accomplished by the plate b upon the cross carriage having the incline b2. As shown in Fig. 4, this finger presses against the plate next to be taken. As the cross-carriage movesthe ledges p and p', sustaining the section, move `it out of position in the hopper toward the grinding-stone. Immediately after it has passed entirely out of the hopper the incline b2 moves behind the finger s and forces the column of sections away. The working end of this finger is in such position as to press upon the sections about their middle and keep them from falling out of place.

The vertical position of this finger is shown in Fig. 5.

ftional view Fig. 7.

cross-carriage.

, In order topress the sections being opera*- ted upon elastically against the grindingstone, a guide M, Fig. 7, is provided, against which the roller at the back of the 'cross-carriagejmoves. Thisguide is elasticallyv held in position by the springs m' and m', the pressure of which is adjustable. The springs are in cases that are secured to the main carriage'bybolts, and the pressure of the springs is regulated by the sleeves m2 and fm2, threaded into the casiugs. The main carriage D is always held in 'its proper relative position to the grinding-stone determined by the conical roller I, which is held against it by a pressure due to the weight h2 on the lever H, which is Y always greater than the pressure on the springs. The details of construction of the springs and their casings are shown in sec- The headsof the bolts m3,l which limit the movement of plate M, are countersunk into the said plate M. The end of the plate M where the cross-carriage strikes it is beveled'off to more readily guide the roller. The tendency of the carriage is to force the plate back slightly when the parts are in position (shown in Fig. 3) and then y maintain it until the section has been ground. The requisite amount of grinding is predeter- .mined by the adjustment of the lock-nuts m4.

Nis a lever havinga head which'is pivoted Y eccentrically to the end of the bolt n., whichl in turn is secured to plate M. By the operation of this/lever the pressure of the springs m' upon the carriage is relieved.

In order to prevent the trough-like hopper from rising, a barV (shown in full lines, Fig. 1, and in dotted lines,` Fig. 2) is so placed as to lie 'above the carriage-roller d5.

The main carriage D is suitably mounted on rollers d5 and d6, so as to reduce friction as much as possible.

The pitman is composed ot' the parts e3 and e5; the part e3 being threaded into the pitmanhead e6 and the part e5 threaded into an enlarged portion of the pant e3. By uncoupling the pitman from either of the wrists it may be lengthened or shortened by turning one part or the other. This ad justmentis for the purpose of giving the cross-carriage more or less movement in the direction desired. If small parts are being ground, the travel on the stone may be but little.

The operation is as follows: The feeder C is pulled back, so as to give room in the hopper for a new supply of sections. The Weight c5 then serves to press them forward to the position of being engaged by the chuck of the VWith the latter in the position shown in Fig. 7 the section next to be operated upon is pressed by the weight into the position relative to the carriage,` shown by dotted lines in Fig. 6. By the rotation of the'shaft E through the instrumentality of the crank and pitman the cross-carriage is moved in the direction to move the section to be operated u pon across the face of the grind- ICO IIO

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ing-stono and back.

Upon the return movement of the carriage the section is engaged or moves against the plate u" and the carriage thus permitted to pass on without, it. Thus freed it drops into any convenient receptacle below. Constant action upon the sections gradually wears away the stone and the conical roller wears, in which case the conical roller I is readj usted.

What I claim as my invention, and desire to secure by Letters Patent, is

l. In a grinding-machine, the combination of a main frame, a rotary grinding-stone supported thereon, a supply-hopper, a main carriage provided with devices for automatically moving` the blanks to be ground from said hopper and delivering them to the grindingstone, said main carriage being yieldingly held against the stone and automatically adjustable to compensate for the Wearing away of the stone.

2. In a grinding-machine, the combination of the main frame, a grinding-stone supported thereon, a supply-hopper, a main carriage provided with means for automatically moving the blanks to be ground from the supplyhopper and delivering them to the grindingstone, racks secured to the main frame, a shaft jonrnaled in said carriage and provided with pinions adapted to engage said racks, and means for turning said shaft.

3. In a grinding-machine, the combination of a main frame, a grinding-stone supported thereon, a supply-hopper, a main carriage provided with means for automatically moving the parts to be ground from said hopper to the grinding-stone, racks secured to said main frame, a shaft journaled in said carriage and carrying pinions adapted to engage said racks, and a Weighted lever having a ratchet-and-pawl connection with said shaft.

4f. In a grinding-machine, the combination of a main frame, a main driving-shaft suitably journaled thereon, a grinding-stone carried by said shaft, a main carriage, a crosscarriage mounted upon said main carriage, a sliding shaft journaled in the main frame and carriage and geared to the main shaft, and a crank-and-pitman connection between the said sliding shaft and cross-carriage, whereby adjustment of the main carriage and crosscarriage relative to the grinding-stone may be made to compensate for wear of the grinding-stone.

5. In a grinding-machine, the combination of the main frame, a shaft journaled thereon and carrying a grinding-stone, a carriage having means for engaging and moving the blank to be ground across the face of the grindingstone, and means for adjusting the path of travel, of said carriage with relation to the face of the grinding-stone.

6. vIn a grinding-machine, the combination `of a main frame, a shaft journaled thereon and carrying a grinding-stone, a supply-hopper, a main carriage, a cross-.carriage adapted to automatically engage and move the blanks from the suppl y-hopper to the grinding-stone, and means movable with the main carriage for actuating the cross-carriage.

7. In a grinding-machine, the combination of a supply-hopper, a carriage, and means to move the blanks to be ground to the discharge end of the hopper to deliver a blank to the carriage as it moves past the hopper, and means to hold the supply away from the discharge end of the hopper on the reverse movement of the carriage.

8. In a grinding-machine, the combination of a grinding-stone, an automatic carriage and a supply-hopper to receive the blanks to be ground, said hopper having an automatically-acting follower adapted to intermittently move the blanks to be ground to position to be engaged by the carriage.

9. In a grinding-machine, the combination of a grinding-stone, a movable carriage for presenting the parts to be ground to the grinding-stone, said carriage adapted to move toward the grinding-stone to compensate for wear, and a roller journaled upon said carriage and adapted to bear upon the grindingstone to control the position of the carriage relative to said grinding-stone.

10. In a grinding-machine, the combination of a grindingstone, a carriage adapted to move on a line parallel with the face of the grinding-stone, a chuck in said carriage having a ledge that when movedinone direction shall engage and move the blank to be ground, and when moved in the reverse direction permit the said blank to be forced out.

1l. In agrinding-machine, the combination with a grinding-stone, of a carriage provided With a chuck adapted to carry the parts to be ground across the face of the stone, asupplyhopper across the end of which the carriage passes, said hopper being provided with means for holding the supply of blanks away from the carriage to permit the chuck to pass in its backward movement, but to permit it to engage one of the blanks in its forward movement.

l2. In agrinding-machine, the combination of a grinding-stone, a cross-carriage adapted to traverse the same and provided with a chuck, and an inclined plate, a supply-hopper having a finger adapted to be operated by said inclined plate on the carriage to move the blanks out of position to permit the chuck vto pass said blanks in its backward movement.

13. In a grinding-machine, the combination of a grinding-stone, a carriage to move blanks to be ground across said stone, said carriage being provided with a chuck connected thereto bya joint permitting the blanks to conform to the face of the stone.

14:. In a grinding-machine, the combination of a grinding-stone, a carriage adapted to move parts to be ground across the face of the stone, and a chuck secu red to the carriage by a universal joint.

15. In a grinding-machine, the combination of a grinding-stone, a carriage movable paral- IOO IIO

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lel to the face of the grinding-Stone, and yieldi ing devices for holding said carriage in position relative to the face of the stone.

1G. In a` grinding-machine, the combination of a grinding-stone, a carriage movable parallel to the face of the grinding-stone, and elas- 'tically-yielding guides for holding said earriage in position relative to the face of said grinding-stone. r

17. Ina grinding-machine, the combination of a carriage provided with a ehuek -having supporting-ledges to hold the blank to be ground, a hopper, a bai' at the side ofl the hopper providediwith a plate having an inolined and a right-angled edge, whereby the bar is moved by Contact of said inclined edge with a blank to permit the blanks to be oarried in one direction by the chuck, and to be pushed from the chuck on theii'everse movement thereof by the right-angled edge;

18. Inagrinding-rnachine, the combination of a grindingstonea main carriage movable toward arid from 'said stone', means acting normally to force said carriage toward theV stone, a Ciossleariiage mountedonthe main carriage, and means to move it across the face ofsaid stone.

In testimony whereof I affix myv signature inl presence of two Witnesses.

GEORGE YV. `PACKER- CEAS. M; CHAMBERS, JOHN F. SVTEWARD.

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