US1395391A

US1395391A - Device for truing and dressing grinding-wheels

Info

Publication number: US1395391A
Application number: US199889A
Authority: US
Inventors: Edward R Conners
Original assignee: PREC TRUING MACHINE AND TOOL C
Current assignee: PREC TRUING MACHINE AND TOOL C; PRECISION TRUING MACHINE AND TOOL Co
Priority date: 1917-11-02
Filing date: 1917-11-02
Publication date: 1921-11-01
Anticipated expiration: 1938-11-01

Description

E. R. CONNERS. DEVICE FOR TRUING AND DRESSING GRINDING WHEELS.

APPLICATION FILED NOV. 2. I917.

1,395,391. Patented Nov. 1, 1921.

2 SHEETSSHEET I.

' II-I I I 4-2- i 4/ L my? 10! [Wen/0r E. R. CONNERS.

I DEVICE FOR TRUING AND DRESSING GRIIIIDING WHEELS.

APPLICATION FILED NOV- 2, I9I7.

Patented Nov. 1, 1921.

2 SHEETS-SHEET 2.

heavy shaft 16 between said centers. Suit-' able means are provided for clamping the work to the head-spindle on which the headcenter is located, as by a clamp 17 extending from the face-plate 18 fast on the headspindle. Thehead-spindle is rotated by-a step-pulley 19 fast thereon.

The frame has

guideways

21, 22, thereon, along which a carriage 23 is arranged to slide lengthwise of the axes of the head and tail spindles. The carriage has thereon a shaft 26, arranged to be suitably driven, as by a belt received over a' pulley 27 fast on said shaft, the shaft also having releasably clamped fastthereon a grinding wheel 28 which, during the grinding operation, moves with the carriage, the periphery of the grinding wheel in the present instance coacting with the surface of the rotating work for grinding the latter. Suitable means are provided for the movement of the carriage lengthwise of the work, exemplified as comprising a screw-rod 29, journaled in suitable bearings on the frame and having threaded connection with the carriage by means of a nut 30.

The screw-rod is arranged to be rotated in opposite directions by a shaft 33, having gears 34-, 35, normally loose thereon, a clutchcollar 36., having suitable spline and key connection with said shaft. The clutch-collar is located between said gears, the said gears and said clutch-collar having the coacting teeth of clutches 3?, 38, thereon.

Gears 4-1, 42, are fixed to said screw-shaft. The gear 35 meshes with the gear 4-2. The gear 34 meshes with an intermediate gear 43, which in turn meshes with the gear l1. When the clutch 37 is in engagement, the screw-rod rotates in one direction, and when the clutch 38 is in engagement, the screwrod rotates in the opposite direction, whereby the carriage is arranged to be moved lengthwise of the work-support in opposite directions. a

Means are provided for automatically reversing the gear direction of movement of the carriage, accomplished for instance by means of providing the carriage with a tappet-lug 45, arranged to engage tappets 4:6, 47, respectively adjustably secured to a tappet-bar 428 slidable in bearings d9 of the frame. The adjustments may be made by reaching through the front of the machineframe, which maybe open. A socket-piece 51 is on the tappet-bar and has a finger 52 extending therefrom. The finger is pressed outwardly by a spring 53 in the socket of gagement with either inclined face by the tappet-bar, the spring pressing the finger along the inclined face for imparting a quick endwise movement to the slide-bar and a quick engagement and disengagement of the respective clutches.

hen the carriage moves the tappet-bar in one direction, the clutch 37 will become disengaged and the clutch 33 engaged, whereas, when the tappet-bar moves in the opposite direction, a reverse relation in the clutches will take place. Stoppage of movement of the carriage is accomplished by means of a hand-lever 65, fast on the rockshaft 56, by means of which the clutch-collar is positioned for disengaging both clutches, in which relation the finger 52 rests on the plane face 64 on the slide-bar.

It is necessary for obtaining true, accurate ztnd desirable grinding, that the grinding wheel be maintained in proper grinding condition. The grinding wheel may in course of operation become out of true, that is to say, its periphery or grinding surface with the material being ground, in either of which cases it isnecessary to repair the grindlng surface of the grinding wheel.

For accomplishing this, 1' provide abrading wheel, preferably an abrading wheel ofcomparatively small diameter, of a texture much harder than the texture of the grinding wheel to be trued or dressed, and provide means for rotating said abrading wheel at a high peripheral rate of speed, preferably so that the abrading wheel will, in the grinding-wheel contacting portion of its peripheral path,move in a direction opposite to the direction in which the abrading wheel contacting portion of the periphery of the grinding wheel moves. I prefer to employ a carborundum abrading wheel.

I further provide means whereby relative axial movement takes place between the abrading wheel and grinding wheel during the truing or dressing operation, and l preferably provide means, which may be employed if desired, whereby the grinding wheel may be dressed during the grinding operation.

Referring again to Figs. 1 and 2., means nee are provided for adjusting the distance between the grinding wheel and the work, exemplified as accomplished by mounting the bearings of the shaft of the grinding wheel on a slide 66, adjustable crosswise of the carriage on guides 67, as by means of an adjusting screw 68, journaled in the carriage and having threaded connection with the slide by means of a nut 69 fixed to the slide. A clamp-bolt TO secures the parts in ad justed positions.

Exemplifying iny improved device as applied to a grinding machine having a workcarriage, and referrng to Figs. 3 and a, parts are. shown similar to Figs. 1 and 2, with the difference that the work is mounted on a carriage so as to move lengthwise in opposite directions with relation to the grinding wheel, which is stationarily located, but having adjustment toward and from the work by being mounted on a slide to move transversely to the direction of movement of the work-carriage. Tn this eireniplification, the parts are designated by reference numerals similar to the reference numerals applied to the parts in Figs. 1 and 2, raised to the series 100, the screw having connection with the worlocarriage for moving the carriage lengthwise of the axis of rotation of the grinding wheel, and the tappet-bar being operated by the work-carriage.

The aorading wheel of my improved device is designated by the numeral 75. This abrading wheel is represented as a cylindrical ahrading wheel coasting vith the cylindrical grinding wheel.

The apraoing' wheel 18 shown releasably secured a haft 76, which is journaled in a bearing; 1?"? comprising a bushing 78. (See Figs. 5, 6 7.) The bushing is a split bushing, as shown by the split 79. lt-s outer periphery is tapered, received in a tapered bore 80' of the outer bearing-member. The bushing has a threaded end 81, over which a nut 82 is received for clamping the bushing firmi in said bore. TV hen the bushing is worn, it is drawn endwise by said nut for contracting its shaft-contacting inner periphery so that an accurate bearing surface between the shaft 'Ziland its hearing may be always maintained. The bushing is prevented from turning by screws 88 in the outer member received a slot 8 in the he hing.

The hearing 77 is secured to a support 85, shown in the form of a bearing-ring, a setholt 86 clamping bearing-ring to the hearing,

l he ahrading-wheel support is adjustably secured to the worlr support, as by providing the bea 'ig-ring with a stern 87 projecting therei' The stern is arranged to be received -ii unfi l d in a lug 89 on the tail-stock Ii, 2 and 5, in a 109 in the tail-stool;

a suitable aperture 88.,

T" u 4.47., id 1gb, O

- diameter 'th 1 1 wheel and o soi 11 1- in Figs. 8 and i, the stern lacing ranged to be clamped in ad usts i positions in its bearing by means or a set-colt 90 in Figs. 1, 2 and 5, and by a set-bolt 190 in Figs. 3 and The shaft 76 is provided with an annular shoulder 91, forming a flange thereon having end bearing on the bushing, for limiting endwise movement of the shaft in one direction in the hearing. The other end of the shaft is provided with a reduced part "forming a shoulder 92, against which a washer 93 is received, the washer bearing; against the other end of the bushing. The abrading wheel 75 is received between the washer 93 and a washer a4, a nut 95 clamping the abrading wheel to the shaft between sail washers, being received over the threaded end of the reduced portion of the shaft, represented as provided with a left-hand thread, assuming that the abrading wheel is arranged to rotate in a right-hand direction.

The abrading wheel is indicated as rotatingz in the direction of the arrow (1, the grinding wheel being instanced as rotating in the direction of the arrow Z), and the work as rotating in the direction of the arrow 0.

An electric motor 96 is provided, and is instanced as comprising a casing 9! and an armature-shards 88. The bearin W is pro vided with laterally es 99, arranged to be secured to e webs 100 of the casing oi the motor by screws 101. T innor end of the bearing is provider bore received over tloi tnxnble 102 about the bearing 103 of the arnaatunesh The arrna ire-shaft is exemplified ii hly connected with the abrading-wheel sh instanced as accomplished by providing tooth-clutch 104 between the proximate ends of said shafts, the respective clutcl being on said respective shafts.

My improved device is such saving in the durability of wheel is accomplished and the Oil the grinding; wheel is enhanc' plished by the abrading wheel d brushing the foreign substances out recesses and pores in the grinding surf-a the grindi 55 wheel and presen to the grinding; wheel which en danger of gouging into th The abrading wheel is of subs '11 the diameter of the wheel so that the drawing or brusi t ereof may be ei'lective.

in my ture is free to move axially between the fields of the electricmotor, so as to automatically follow the lines of electric force and utilize the motor capacity.

If desired, the abrading wheel may be adjusted to contact the grinding surface of the grinding wheel, preferably with only slight pressure, alternately with the contacts of the rinding wheel with the work. for maintaining the grinding surface of the grinding wheel in accurate condition.

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

1. In a device of the character described; the combination of a work-support, a support for a grinding wheel, means for causing movement between said supports lengthwise of the axis of rotation of said grinding wheel, an abrading wheel for truing said grinding wheel, said abrading wheel mounted on said work-support, and an electric motor mounted'on said work-support for rotating said abrading wheel, said grinding wheel arranged by said movement between said supports to be brought into coactive relation with both the work on said work-sup= port and said abrading wheel during maintenance of position of said grinding wheel on its support.

2. In a device of the character described, the combination of a work-support, a support for a grinding wheel, an abrading wheel for the grinding wheel, a support for the latter mounted on said work-support, and an electric motor mounted on said support for said abrading wheel having a flexible drive-connection with said abrading wheel, said grinding wheel arranged by said movement between said supports to be brought into coactive relation with both the work on said work-support and said abrading wheel during maintenance of position of said grinding wheel on its support.

. 3. In a device of the character described, the combination of a rotatable grinding wheel, a shaft, a rotatable abrading part attached to said shaft for coacting with said grinding wheel in order to surface the grinding surface of said grinding wheel, an electric motor for driving said shaft, means for fixing said shaft endwise the axes of rotation of the armature-shaft of said electric motor'and said shaft being substantially coincident, said shafts having a flexible driving connection between them for axial movements of said armature-shaft relative to said first-named shaft, and means for causing feeding movement between said grinding wheel and said abrading wheel lengthwise of the axis of rotation of said grinding wheel. 7

4. In a device of the character described, the combination with a work-support and the support of a grinding wheel, rotating means on said work-support for rotating the work, means for causing movement between said supports lengthwise of the axis of rotation of said grinding wheel, an ,abradingwheel support provided with a stem, means for securing said stem on said work-support, a shaft journaled in said abrading-wheel support, an abrading wheel secured to said shaft, an electric motor having support on said abrading-wheel support, and a flexible drive connection between the armatureshaft of said motor and said shaft of said abrading wheel, the said rotating means for the work, said grinding wheel and said abrading wheel being so related that upon said movement between said supports said grinding wheel may coactwith both said work and said abrading wheel during maintenance of its position on its support.

5. In a combined grinding and truing machine, the combination of a work-support, a grinding-wheel support, an abrading-wheel support, means for adjustably securing said abradingwheel support to said work-support, a shaft journaled in, said abradingwheel support, an abrading wheel secured to said shaft, an electric motor supported by said abrading-wheel support, and means for causing movement between said worksupport and grinding-wheel support lengthwise of the axis of rotation of said grinding wheel for coaction of said grinding wheel with the work on said work-support and with said abrading wheel during maintenance of position of said grinding wheel on its support.

6. In a combined grinding and truing machine, the combination of a work-support, a grinding-wheel support, a grinding wheel thereon, a support for a rotatable abrading part, a rotatable abrading part thereon, means for adjusting said grinding wheel and said rotatable abrading part in directions transverse to the axis of rotation of the work at opposite sides of the lines of contact between the grinding wheel and the work and between the rotatable abrading part and the grinding wheel, in order to locate the peripheries of said work and said. rotatable abrading' part at the cylindrical projection of said grinding wheel, and means for causing movement between said supports lengthwise of the axis of rotation of said grinding wheel for causing alternate contacts between the grinding wheel and the work and between the rotatable abrading part and the grinding wheel during maintenance of position of said grinding wheel on its support.

7. In a combined grinding and truing ma- -chine, the combination of a work-support,

rotating means thereon for rotating the work, a support for a grinding wheel, rotating means thereon for said grinding wheel, a rotatable abrading part mounted on said work-support and arranged for coaction with said grinding wheel, means for rotating said rotatable abrading part, and means for causing movement between said supports lengthwise of the axes of rotation V rotating means thereon for rotating the work, a support for a grinding wheel, ro-

tatin means for said grinding wheel, a rotatab e part mounted on said work-support, rotating means for rotating said rotatable abrading part, and means for causing movement between said supports lengthwise of the axis of rotation'of said grinding wheel for selectively causing coaction between said rotatable grinding wheel and said rotatable work and between said rotatable abrading part and said rotatable grinding wheel while the angularrelations and distances between said axes of rotation are maintained.

9. In a combined grinding and truing machine, the combination of a work-support,

rotating means thereon for rotatin the work, a support for a grinding whee, ro-

tating means thereon for said grinding wheel, a rotatable abradingpart mounted on said work-support and arranged for coaction with said grinding wheel, an electric motor mounted on said work-support for rotating said rotatable abrading part, and means for causing movement between said supports lengthwise of the axes of rotation of said first two named rotating means for selectively causing coaction between saidrotatable grinding wheel and said rotatablework, and between said rotatable abrading part and said rotatable grinding wheel.

10. In a combined grinding and truing machine, the combination of a work-support, rotating means thereon for rotating the work, a support for a grinding wheel,

rotating-means thereon for said grinding wheel, a rotatable abrading part mounted on said work-support and arranged for coaction with said grinding wheel, an electric motor. mounted on said work-support for rotating said rotatable abrading part, means for causing movement between said supports lengthwise of the axes of rotation of said first two named rotating means for selectively causing coaction between said rotatable grinding wheel and said rotatable 'work and between said rotatable abrading part and said rotatable grinding wheel, the axes of rotation of said rotatable abrading part and the armature shaft of said electric motor being substantially parallel, and flexible driving connection between said armature shaft and said rotatable abrading part.

11. In a device of the character described, the combination of a work-support, a support for a grinding wheel, an emery grinding wheel on said last-named support, means for causing movement between said supports lengthwise of the axis of rotation of said grinding wheel, a carborundum abrading wheel mounted on said work-support, said carborundum abrading wheel having a texture much harder than the texture of said grinding wheel, said grinding wheel arranged by said moveinent between said supports to be brought into coactive relation se- .ports lengthwise of the axis of rotation of said grinding wheel, a carborundum abrading wheel mounted on said work-support, said carborundum abrading wheel having a texture much harder than the texture of said grinding wheel, and constructed and arranged whereby to draw foreign substances out of the recesses in the grinding surface of said grinding wheel, for the purpose described.

13. In a device for truing and dressing grinding wheels, the combination of a worksupport, rotating means thereon for rotating the work, a support for a grinding wheel. rotating means thereon for said grinding wheel, a rotatable abrading part mounted on said work-support and arranged for coaction'with said grinding wheel, means mounted on said work-support causing maintenance of rotation of said abrading part, and means for causing movement between said supports lengthwise of the axis of rotation of said grinding wheel for causing alternate coaction between said rotatable grinding wheel and said rotatable work and between said rotatable 'abrading part and ,said rotatable grinding wheel.