US1017881A - Grinding-machine. - Google Patents

Description

A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

Patented Feb. 20, 1912.

5 SHEETSSHBET l.

D/witnesses @zQ-Z. 2222a,.

A. B. LANDIS.

GRINDING MACHINE. APPLICATION FILED JULY 17 Patented Feb. 20, 1912.

5 SHEETS-SHEET 2.

GHQ (Ma V A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17 1909. 1,017,881.

5 SHEETS-SHEET 3v 5] I I zmww MMZWMI Patented Feb. 20, 1912.

A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

Patented Feb. 20, 1912.

5 SHEETSSHEET 4.

llll: hm!

w ww

ANN-neg.

' A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED JULY 17,1909.

1,017,881, Patented Feb. 20, 1912.

5 SHEETS-SHEET 5.

m m \n Q 1* u: g P IQ O5 WITNESSES.-

ABRAHAM B. LANDIS, OF WAYNESBORO, PENNSYLVANIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed July 17, 1909. Serial No. 508,232.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIS,

a citizen of the United States, residing at.

construction, whereby a machine of this character for this purpose is providedadapted to perform the Work automatically and in a very efficient and expeditious manner, all as willbe hereinafter more fully described and claimed.

Beferring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure '1 is a front elevation of a grinding machine of the character described embodying my said invention, Fig. 2 anen d elevation thereof showing the parts in the position they occupy during the operation, Fig. 3 a similar view showing the parts in the position they occupy as the work is beingbrought to position for the operation, Fig. 4: a view partly in horizontal section and partly in top plan with the parts in the position shown in Fig. 2, Fig. 5 a central sec-' tional view through the head-stock and footstock, showing the holding devices on an enlarged scale, Fig. 6 a view similar to a portion of Fig. 5, showing the head-stock chuck on a still further enlarged scale with the chuck in the position it occupies when holding the'work, Fig. 7 a similar view showing the chuck in position with the work released, Fig. 8 a face view of Fig.- .7, and Fig. 9 a detail view on the dotted line 99 in Fig. 5.

In said drawings the portions marked A represent the bed of the machine, B the work table and G the grinding wheel base. The bed A may be a bed of a grinding machine of any appropriate general con struction and requires no detailed description thereof. The work table B is mounted on bed A by means of clamping bolts a in the usual manner and isof a form and construction suitable to support the work-carrying and the feeding mechanism, as will be presently more fully described. The grinding wheel base 0 is also of any appropriate construction mounted on one side of the bed A in the usual or any suitable manner and carries the grinding wheel C mounted in suitable bearingsc, 0' on saidbase provided with a driving pulley C as usual.

The invention relates particularly to the means for feeding and holding the work to the grinding wheel which is mounted upon the table B. It consists of a work-holding chuck 10 mounted on the innerend of a rod which is mounted to slide in the perforation in a hollow head-stock spindle 11. Said spindle is mounted in suitable bearings on the head-stock frame B and provided with a driving pulley let by which it is geared to the driving power. Said chuck 10 is secured on the rod 60 by a socket with a screw-threaded connection at .its inner end and at its outer end is split into several clamping jaws,'as best shown in Fig. 8, the recess in the outer faces of said jaws being adapted to surround the head ofthe pin to p be ground. The outside surface of the inner end of said chuck is tapered and it is mounted within a tapered socket in the inner end of the spindle 11. A sliding discharging pin 61 is mounted with itshead in a socket in the inner end of said chuck the pin being adapted to slide in a central perforation to project beyond its outer face within the jaws and normally held outward by a coiled spring 62 inserted between the head of said pin and the inner end of the rod 60. Said chuck 10 is held from turning independently of spindle 11 by a transverse pin 75 mounted in a perforation in said spindle with its inner end engaging a longitudinal groove in the side of said spindle. Near the outer end of said rod 60 it is provided with a collar 63 between which'and a collar 64, abutting the outer end ofspin le 11, is mounted a coiled spring 65 which normally tends to draw said rod 60 outwardly and to pull the chuck 10 with its tapered outer face into the tapered socket in the inner end of the outer end of said rod, said bearing plate being adapted to rotate freely thereon, ballbearings being interposed between a head 68 on the outer end' of said rod and the inner surface of said bearing plate. Said plate is preferably formed cup-shaped and adapted to inclose said head 68. A roller 69 is mounted on a shouldered screw 70 in the top of a standard 71 on a bracket 72 secured by a bolt 73 to the bed A for a purpose to be presently described.

The head-stock and foot-stock frames B and B are mounted upon a frame or base B mounted on pivots b and b which extend through brackets on the front edge of table B into pivot holes in the ends of said base. A transverse shaft 15 is mounted in the head-stock frame B immediately beneath the head-stock spindle l1 and is provided with a gear g with which a worm 16 on said spindle engages. On the outer end of said shaft is mounted a cam 17, which is adapted to rest upon a bearing block 18 mounted on a pivot 19 on base B Said cam 17 is concentric with the axis of shaft 15 for the greater portion of its periphery but on one side is cut away as best shown in Fig. 1. During the contact of the concentric portion of the periphery of said cam with bearing block 18 the pivoted base B will be held in position to support the work in position to be operated upon by the grinding wheel, but during the contact ofthe portion which is eccentric to the axis of said shaft the frame is permitted to be tilted backward to carry the work away from the grinding wheel for a purpose to be presently described. The tilting base B is thrown back, away from the work, by the action of a spring 20 mounted in a horizontal socket in frame B and bearing against a lunger 29, mounted in the front end of sai socket with its outer end bearing against a depend? ing arm 6 of said tilting base. The holding point 12 in the foot-stock spindle 21 is normally held against the work under pressure by a spring 22 which surrounds said spindle and bears at its forward end against a shoulder therein and at its rear end against a collar 23 forming the bearing for its outer end. A wheel 24 with a tapered inner face is mounted on the outer end of said spindle 21 and when the base carrying the foot-stock is tilted backward said tapered face is adapted to contact with a roller 25 mounted on the top of a stud shaft in a bracket 26 supported from the table B adjacent thereto, which serves to draw, said spindle backward in its bearings and release the holding point from the work.

A work-holding and feeding Wheel 30 is mounted on a shaft 31 in brackets B also forming a part of the pivoted base B It is provided at regular intervals inits periphery with notches for containing the work, said notches being of a depth to receive the pins and hold them so that a portion of their peripheries will project beyond the surface of the wheel for contact with the grinding wheel. A magazine 32, consisting of an upright with a T-slot to receive the heads of the pins is bolted to the side of the bracket B and into this the pins are fed by hand,

or any appropriate mechanism. A spring retainer 33 is secured to the front edge of magazine 32 by a screw 34 and is of a form to extend from over wheel 30 to a point near the point of contact between the grinding wheel and the work and serves to hold the pins in place, as clearly shown in Figs. 2 and 3. A similar spring retainer 46 is mounted on the frame under the wheel and extends up adjacent to the point of contact between the grinding wheel and work and serves to guide the pins to the point of discharge after being ground. The adjacent ends of said springs 33 and 46 bear against the pins and steady them during operation. See dotted lines in Fig. 2. A spring pawl 35 is mounted on a rod 36 mounted rigidly on a shaft 37 on the upper end of a post 38 and is adapted to engage with the notches in the periphery of said wheel 30 and advance said wheel step by step during the operation of the machine. A spring 39 on said rod 36 bears between the lower end of said pawl and a nut 40 on the lower end of said rod for operating said pawl. A spring 41 connected at its upper end to a pin 42 whichprojects into the shaft 37 and atits other end to a pin 43 in the post 38 operates to hold said pawlforward normally in engagement with the periphery of said wheel. A brake wheel 44 is mounted on the outer end of a spring 45 secured on the lower end of bracket B and is held by said spring into contact with the periphery of said wheel and is adapted to engage the notches therein and halt said wheel in its forward movementinthe proper position for operation.

A diamonding tool 50 is mounted on the forward end of a screw rod 51 which is mounted in a transverse perforation in the foot-stock bracket B in the position for dressing the grinding wheel when needed. The adjustment of-said screw rod 51 is provided for by nuts 52 and 53 engaging with screw-threads thereon in the well known manner. A clamping screw 54 is arranged to impinge against the side of rod 51 and hold it in any adjusted position.

In operation the pins to be ground being placed in the magazine 32 as shown most plainly in Figs. 2 and 3 and the parts being in operative position, as shown in Fig. 2, the grinding wheel C will operate to grind the face of the pin w (see Fig. 4) which is being rapidly rotated by means of the power transmitted to the head-stock spindle 11 through the pulley 14 thereon, the grinding wheel being driven through the pulley O in the usual manner. As the head-stock spindle 11 revolves the screw 16 thereon, operating in mesh with the gear 9 on shaft 15, turns cam 17 until its eccentric portion is reached, when the tilting base B is permitted to tilt backward under the action of spring 20, carrying the work away from the wheel. As the base is tilted backward from the position shown in Fig. 2 to the position shown in Fig. 3, by reason of the power of the spring 20 being greater than the power of the spring 39, the pawl 35 on rod 36 is carried downward on said rod and said spring 39 compressed while spring 41 is extended by the rocking of the shaft 37. The wheel 30 is, however, held by said pawl 35 which engages with the notch in its periphery so that'this operation will turn it forward slightly on its shaft 31 and bring the magazine 32 back of the notch with which it registered while standing in operative position. During the tilting back of the base B bearing plate 66 rides over roller 69, which brings its central or highest point in line with the axis of said roller and operates to force rod 60 inward releasing the jaws of chuck 10 from the work w. Cam wheel 24. on spindle 21 then strikes roller 25 and draws back said spindle to release its holding point 12 from the work and permit spring 62 operating through discharging pin 61 to force the work out of chuck 10 and discharge it from the wheel. Asthe cam 17 turns to bring the part concentric with its axis in contact with the block 18, the base B carrying the work holding devices is tilted forward, when pawl 35, through the action of spring 39, will operate to turn Wheel 30 until the brake wheel drops into the next notch in the periphery of said wheel, which will bring the next pin in said wheel into position to be ground by the grinding wheel C and bring the notch at the top of the wheel into position to receive the next pin from the magazine 32. As the wheel passes to position to bring the pin to into position to be ground the tapered wheel 24: is released from contact with the roller 25 and spring 22 is permitted to force spindle 21 forward carrying the holding point 12 against the point of the pin and driving the head of said pin into chuck 10 carried by spindle 11, when bearing plate 66 will be moved so that its side, or lower point of its bearing face, will bear on the side of a strike, such as a wheel 6.9, as shown in Figs. 4 and 5, whenspring will operate to draw rod 60 outward and the chuck to within the tapered socket in the inner end of the spindle, forcing its jaws firmly onto the work to clamp it and hold it to rotate with said spindle '11, which rapidly rotates the work and subjects it to the operation of the grinding wheel. Thus the operation may be continued as long as pins are supplied to the magazine.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a grinding machine, the combination of a frame, the grinding wheel, and the work-holding and feeding devices comprisgrinding wheel, a work table, work-holding and feeding devices mounted on said tablej comprising a tilting frame carrying the head-stock and foot-stock and a rotary" heel for receiving and carrying forward the pins to operative position, and means for operating the frame to carry the work away from operative position, substantially as set forth.

3. In a grinding machine, the-combination of a frame, a grinding wheel, means for operating said grinding wheel, a work table, means mounted on said work table for holding and feeding the work comprising a head-stock and foot-stock carrying the work-holding means mounted on a tilting base, a rotary wheel alsomounted on said base and formed with notches in its periphery to receive and carry the work, means for driving the'work-holding means, arotary cam carried on said tilting frame and geared to the work-driving mechanism, a contact block for said cam on the work table, and means for holding said tilting frame with said cam under pressure against said. block, substantially as set forth.

at. In a grinding machine, the combination of a frame, a grinding wheel, means for operating said grinding wheel, a work table, means for holding and feeding the work mounted on said work table comprising a head-stock and foot-stock mounted on a tilting base, said head-stock carrying a chuck for clamping one end of the work and said foot-stock carrying a holding point for engaging the other end of the work, means for driving said head-stock, a spring for holding said work engaging holding point into contact with the work, a cam on said foot-stock adapted to engage a contact point on the table and withdraw said holding point from the work when the table is tilted backward, a rotary wheel formed with notches toreceive and carry the work, and means for moving said wheel step by step, substantially as set forth. i

5. In a grinding machine, the combina; tion of a frame, a grinding wheel, means for operating said grinding wheel, a work table,

means for holding and feeding the .work

mounted on said table comprising a headstock and a foot-stock mechanism mounted on a tilting base, means for holding said &

. the work, means for tilting said base to carry the work away from operative position, means for releasing the work, a rotary wheel on said tilting base formed with work-holding notches in its periphery, and means for moving said wheel forward step by step between the grinding operations, substantially as set forth.

6. In a grinding machine, the combination of a frame, a grinding wheel, means for operating said grinding wheel, a work table, work-holding and feeding devices on said table comprislng a tilting base carrying the foot-stock and head-stock, said headstock carrying a work-holding chuck, said foot-stock yieldingly mounted and carrying a point for engaging the work, means for withdrawing said point from engagement with the work automatically as the base is tilted, a rotary wheel also mounted on said tilting base and formed with workcarrying notches in its periphery, means for holding the work in said notches, and means for advancing said wheel one notch at each tilting operation of said base, substantially as set forth. 1 p

7. In a grinding machine, the combination ofaframe, a grinding wheel, means for operating said grinding wheel, a tilting base carrying the work-holding and feeding devices, said work-holding and feeding devices comprising a rotar wheel with work-receiving notches in 1ts periphery, a spring pawl engaging with the notches in the rear of said wheel, means for tilting said frame toward and from the operative position, and a brake adapted to engage the notches in the periphery of said wheel successively to halt it atthe point which will bring the work to operative position, substantially as set forth.

8. A grinding machine for grinding pins,

with said notches for holding the wheel in the proper position and bring the work to the grinding point, means for tilting said frame, and meansfor holding and driving the work, substantially asset forth.

9. A grinding machine comprising a frame, grinding mechanism and work-holding and feeding devices, said work-holding v and feeding devices being mounted on a tilting frame, and means for tilting said frame back and forth toward and from the grinding wheel which operation serves to feed the work to the holding devices and the grinding wheel, substantially as set forth.

10. A grinding machine comprising the grinding mechanism, a tilting frame carrying the work-holding and feeding mechanism, means for holding said frame in position for the grinding wheel to operate upon the work, means fortilting said frame to receive and feed the work, holding devices comprising a sliding chuck adapted to receive and clamp thework, a spring for sliding said chuck to clamp the work, and a strike arranged to contact with a tapered surface and slide said chuck to open it, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Washington, District of Columbia this 29th day of June, A. D. nineteen hundred and nine.

-ABRAHAM B. LANDIS. [L. s.]

Witnesses:

E. W. BRADFORD, J. D. YOAKLEY,

Images