US1991953A - Grinding machine - Google Patents

Description

Feb. 19, 1935. L. F. NENNINGER' 1,991,953

A GRINDING MAHINE Filed March '7, 1932 4 Shets-Sheet 1 @www Feb. 19, 1935. l.. F. Nr-:NNINGfl-:R .1,991,953

GRINDING y MACHINE Filed Mgroh. '7. 1932 4 Smets-Sheet' 2 nl, VQ

w w H F. NENNINGl-:R A 1,991,953

GRINDING MACHINE Feb. 19,1935.

4 She'etS-Sheet 5 Filed March '7, 1952' Patented Feb. 19, 1935 UNITED STATE GRINDING MACHINE Lester F. Nenninger, Cincinnati, Ohio, C cinnati Grinders Incorporated,

assigner to Cincinnati;

This invention lrelates'to improvements in machine tools and especially to improvements in grinding machines.

An object of the invention is the provision of improved means for controlling the automatic operation of machine machines, to control produced thereby tools, particularly grinding the size ci work pieces being and insuring saidwork pieces being held within extremely narrow limits of size, such as one or two ten-thousandths of an inch.

Another object of the sion of an improved sizing invention is the providevice or mechanism that is operated by the work pieces as they pass thereby from the tools of the machine.

Another object of the invention is the provision of a sizing mechanism of the multiplication lever type having the parts means for insuring improved thereof jointed by the proper positive shift between said parts and in which all side or lateral play is positively eliminated.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings, forming a. part thereof, and any modifications may it is to be understood, that be made in the exact structural details there shown and described within the scope of the appended claims, ing from or exceeding the spirit of without departthe invention.

in the drawings: Figure 1 is a front elevation of a grinding machine embodying the improvements of this invention.

Figure 2 is a top in Figure 1.

Figure 3 is an ing the grinding throat of a particularly seen from plan view of the machine shown elevational view of the parts formcenterless grinder as line 3-3 on Figure 1.

Figure 4 is a view partly in elevation and partly in section as seen substantially from line 4--4 of Figure 3.

Figure 5 is a view partly in elevation and partly in section as seen from sectional view taken on line 6-8- Figureiiv is a `of Figure 5.

line 5-5 of Figure 4.

Figure 'I is a fragmentary sectional view on line 7--7 of Figure 3.

Figure 8 is a of Figure 41.

Figure 9 is oi Figure 8.

sectional view taken on line 8-8 sectional view taken on line 9-9 Figure 10 is a fragmentary sectional view taken 0n line 10--10 0f Flgureil'isa Figure 8. sectional view through the control face with guideweys ure 9.

Figure 12 is a sectional view compensator taken substantially on of Figure 9.

Figure 13 is a diagrammatic the electrical circuit involved in Throughout the several views similar reference characters are note the same or similar parts.

As was noted above, this a'n improved size control s PATENT oFFlcE showing the piston line 12-12 view illustrating the invention.

of the drawings employed to deinvention pertains to mechanism for machine tools, having particular reference to grinding machines. The invention is shown in connection with a centerless grinding machine, but it is to be understood that it is equally applicable to a center type and other types of grinding machines or any machine tool that removes stock from a work piece, including a feeding mechanism for the tool or work piece that is to be cut on or increased as the size of the work nears the ultimate desired point.

The grinding machine illustrated in the drawings is of the through feed centerless type, in which the work pieces are continuously passing through the grinding throat is adapted to effect adapted further to other factors when duced to the final desired size.

and which machine a continuous production' and compensatefor wheel wear or the work pieces fail to be re- In general the machine illustrated in the drawings comprises a bed 15 having rising therefromA at one end thereof a pedestal bearing 16 in which is journaled a spindle 17 for a grinding wheel 18. The spindle and grinding wheel are adapted to be rotated at a high grinding rate desirable: means or hi any desirable manner. The

wheel provides a hood 19 enclosing the grinding of speed by any bracket or shelf 20 supporting a truing mechanism 21 adapted to traverse the grinding wheel sharp condition.

The bed 15 is further provided 22 for a be adjusted relative the grinding wheel.

vided with ways 24 for a second the operative face of 18 to maintain same in a true,

on its upper surslide 23 adapted to to the bed'toward and from The slide 23 is further proor upper slide 25 adapted to be actuated relative to the lower slide 23 or clamped thereto by means of 'a clamp 26 whereby the said slides are actuated as a unit. In order to eiIect the independent adjustment of the slides, clamps2'1 are provided for securing the lower slide 23`to the bed. integral therewith and rising bracket'or housing '28 to which is The upper slide 25 has therefrom the pivotally secured a head or housing 29 enclosing a spindle 30 carrying at its one end a regulating wheel 31. The regulating wheel and its spindle are adapted to be rotated at a relatively slow work -rotation controlling rate of speed. The grinding wheel 18 and the regulating Wheel 31 are each rotated in a clockwise direction whereby their proximate portions travel in opposite directions, said portions forming between them a grinding throat in which the work is positioned to be operated upon by the grinding wheel. By oscillating the head or housing 29 about the axis of its pivotal connection the regulating wheel is canted as respects the grinding wheel and Work and thereby effects an axial feed or travel of the work.

The lower slide.23 is provided at its forward end with a work rest block 32 which is positioned beneath the grinding throat and supports a work rest blade 33 peripherally supporting the work 34 as it passes through the-said throat. 'I'he block 32 is provided adjacent the vertical sides of the blade 33 with guides 35 and 36, the former being at the forward end ofthe throat, while the latter is positioned-at the rear end of the throat. As shown in Figure 4, and since they are substantially duplicates of one another it is presumed a description of one of them will suffice for the other, the guide 36 comprises opposed guide blocks 37 and 38, one positioned on-each side of the blade and each having an angular groove formed in the end side thereof respectively receiving a correspondingly shaped tongue 39 and 40 formed respectively at the upper end of arms 41 and 42. The said arms are respectively received in vertical recesses 43 and 44 formed on opposite sides of the work rest block 32. The arm 41 is pivoted'at 45 'ends of the face.

to the block by the pivot passing through the said recess while the arm 42 is similarly pivoted to a rod or shaft 46 extending through the recess 44. 'Ihe block 32 is provided intermediate its upper and lower surface with a threaded perforation 47 in which is screw threaded a plug 48, this plug 48 having a V-shaped notch 49 formed therein to provide a cam face 50 adapted to be engaged by the end of an adjusting screw 51. The lower extremity of the arms 41 and 42 terminate in alignment with one another and on opposite ends of an opening or perforation 52 formed through theA block 32 near its lower end. A spring 53 extends through the perforation 52 and has its opposite ends respectively secured to the said lower extremities of the arms 4l and 42 and this spring tends to draw said' extermities to one another, thereby oscillating the arms 41 and 42 in opposite directions or tending to separate the guide blocks 37 and 38. 'Ihis oscillation of the arms is restrained by the end of the adjusting screw 51 engaging with the cam face 50 and limits the separation of said blocks, which may be varied by adjusting the screw so that the end thereof engages the cam face at a point nearer the upper or lower This adjustment is necessary to permit the machine to handle other than a single size work piece.

The work pieces on passing from the`grinding throat are supported by a blade 54 which has an inclined operative surface 55 co-operating with the inclined surface 56 of guide lblock 57 secured to the inclined portion 58 of a second blade 59 mounted adjacent to the blade 54. The said blades 54 and 59 through the inclined surfaces 55 and 56 form a V- shaped guide trough for guiding the work pieces after they pass from the grinding throat. The said blades are mounted in a recess 60 formed longitudinally of a bracket 61 lsecured in any desirable manner, such as by bolts 62 to the rear face of the work rest block 32. The blades 54 and 59 are adapted to be vertically adjusted relative to the 'recess 60 by means of adjusting screws 63 and 64 to take care of various sizes of work pieces and the said. blades are clamped in their adjusted positions by means of clamp screws 65.

The bracket 6l is formed longitudinally thereof at its upper end with a T-slot 66 receiving the headed end of the bolts 67 which pass through suitable perforations formed in a bracket 68. This bracket 68 carries the size control mechanism and for this purpose is provided with a slide Way 69 receiving. the tongue '70 of a slide 71. 'I'he slide 71 has projecting from it near its upper end a boss 72 in which is rotatably journaled the inner end of an adjusting screw 73 threaded in a nut or lug 74 secured to or formed integral with the upper end of the bracket or standard 68. The screw 73 has secured to its outer end a knob 75 whereby it may be rotated for adjusting the position of the slide 71 and parts carried thereby. 'I'he slide 71 is held yieldably to its seat by means of vsprings 76 which surround studs or bolts 77 extending from the lower surface of the slide 71. The springs abut on one end with the rear face of the bracket or standard 68 and on the other end with lock nuts 78 secured thereto. 'I'he slide 71 is provided on its forward surface with an elongated boss 79 having formed therein a guide groove 80 receiving the tongue 81 projecting from the housing 82. The housing 82 is provided with an elongated perforation 83 through which a clamp bolt or screw 84 extends having its threaded end received in the lug 79 and whereby the housing 82 is adjusted laterally of the slide 71. Asl seen in Figures 3 and 5, the housing 82 is substantially L-shaped including the hollow vertical arm 85 and the cylindrical arm 86, the former containing suitable amplification levers and electrical contacts while the latter contains and supports 'the sizing mechanism operating parts.

The cylindrical arm 86 is adapted .to be positioned beyond the grinding throat so that the Work pieces in passing from the throat pass thereunder and if beyond a given size, one ten-thousandth or so of an inch, engagewith feeler finger or feeler member 87. This member 87 is clamped between the fingers of a block 88 which depends below the arm 86. 'I'he block 88 is connected by means of flat fulcrum members 89 and 90 with a guide block 91 secured in any desirable manner to the swivel head 92 of the gaging mechanism. The head 92 is integral with or secured to a sleeve 93, which is journaled in a suitable bore formed .in the cylindrical arm 86 of the housing 82. By this construction and as will later appear, the head 92 may be rotated or oscillated relative to the arm 86 to position the gaging nger or feeler 87 at any desired angle with respect to the work as it passes thereby. The flat fulcrum members 89 and 90 are secured to the guide screws 91 by means of clamp blocks 94 and screws 95. Any other desirable method, however, may be used for securing these members, such as welding or the like. The upper end of the vertically shiftable gage block 88 is connected by the at fulcrum 96 to the end of arm 97 of bell crank lever 98. The bell crank lever 98 is connected by a flat fulcrum member 99 for oscillatory movement to the head 92 and is adapted to oscillate through the fulcrum member 99 in a single plane, all other movement being prohibited by the said fulcrum 99. 'I'he other arm 100 of the bell crank '98 'is connected by a iiat fulcrum 101 with an axially shiftable rod 102 passing through a relatively large bore 103 in the sleeve 9,3 of the gage head 92. This' rod 102 is formed on the end with a counterbore 104 in which is seated a spring 105 abutting on one end with the base of the counterbore 104 and on the other end with the end of a headed pin 106 slidable within the counterbore 104. The head 107 of the pin 106 abuts the adjacent end of a stop screw 108 adjustably threaded onI the end of a. comparatively long arm 109 positioned within the hollow interior of the arm 85 of L-shaped bracket 82. This arm 109 is pivoted by means of a' flat fulcrum 110 which is located near the stop screw or lower end of the arm 109, being mounted in a boss or lug 111 projecting from the wall of y the arm 85. The 'upper end of the arm 109 is in turn connected by means of a fiat fulcrum 112 with a second vertically disposed arm 113 likewise pivotally mounted by means of a fiat fulcrum 114 to a block or boss 115 carried by the arm 85 interiorly thereof. The lower end 11S of the arm 113 lies adjacent the end of switch contact member 117, which is adapted to have its contact 118 placed in engagement with a contact 119 on secondswitch contact member 120. The switch contactarms 117 and 120 are mounted on an insulation Ablock 121 which has secured thereto the binding posts 122 and 123 for the electrical leads which extend to a compensating device,

feed stop mechanism or the like as will later appear.

'I'he operation of these parts as seen in Figure is as follows. Assuming the over-sized work piece to be traveling to the left, as seen in Figure 5, it will encounter the contact member 87 thereby vertically shifting the gage block 88. This is an absolute vertical movement because the fulcrums 89 and 90 will prohibit any side lay. The `vertical shifting of the gage block 8 pushes upwardly through the fulcrum 96 against the arm 97 of bell crank 98 thereby oscillating it in a clockwise direction about the fulcrum 99 which again is a iiat fulcrum thereby prohibiting any lateral or sidewise movement and insuring a true arcuate travel of the lever. This clockwise oscillation of the lever 98 will through the fulcrum 101 axially shift the rod 102 to the left and again since the fulcrum is aA fiat member prohibiting any lateral or side movement between the parts, will urge the rod in a truly axial direction. The shifting of the rod 102 through the pin 107 which is held in a fixed or stationary position due to the comparatively heavy strength oi the spring 105, will oscillate the arm 109 in a erably nearer' the clockwise direction about the fulcrum 110. Since this fulcrumlll) is a fiat member no sidewise movement of the parts can take place, thereby insuring the arm oscillating through a definite plane. Since the fulcrum 110 is placed considthe upper end of the arm 109 will travel through a considerable' distance compared to the travel of the lower end of the arm. This oscillatory movement of the arm 109 will through the fulcrum 112 oscillate the short arm 113y in a counterclockwise direction about the fulcrum'l14 and sincel the fulcrums 112 and 114 ar'e again fiat fulcrums,A

no sidewise movement of these arms can takel place insuring the proper movementof the mem-l bers through the desired plane. The oscillatory movement of the arm 113 will through its end 1 16 force theyieldable switcharm to the right caus-V `above described for closing lower orfadjusting screw end,`

I ened and the clamp .27

.due to truing thereof.

through one wall of the arm 85 into contact with the adjacent face of the arm 109. The spring 105 above described and contained within the counterbore v104 likewise exerts a pressure to the right for urging the rod102 in that direction and thereby taking the back lash out of all of the parts within the gage head 92. lThe adjustable screw 108 on the lower end of the arm 109 will upon actuation of the arm 109 an undue amount engage with adjustablel stop screw 128 carried by one wall of the hollowvarm 85 and will limit the movement of the parts within the arm 85 to prevent rupture thereof while the spring 104 would yield, to likewise prevent rupture of the parts within the gage head 92.

From the foregoing it will be noted that there has been provided a mechanism in which every effort has been made to insure the proper movement or actuation of the parts and to eliminate all possible side play and thereby out down the ultimate shifting of the parts eliminating a possible chance of error. Furthermore it will be noted that through the large ampliiication in the arm 109 and the further amplification in the arm113 very slight movement is required of the feeler member 87 and gage block 88 for closing the electrical circuit contact and that said contacts may be adjusted to a very line degree for insuring the proper operation of the parts.

As is well known, the work rest blade 33 is provided with an operative inclined surface 129 which is varied depending upon the size of the work piece being operated upon and in order that the'proper distance may be had between the operative face 129, of the blade and the knife edge contact of the feeler 87, the head which carries these parts is,`as above noted, adjustable through the sleeve 93 for aligning said knife edge contact of the member'il'l in parallelism with the angle top 129 of the blade. In this way a true gage is provided through which the work Vpiecesmust pass and if they are slightly over-size even though only one ten-thousandth of an inch, the member 87 will be lifted and thereby operate the parts the electrical circuit. As was noted above, the upper and lower slides 23 and 25 are adapted to be actuated as a unit and relative to one another. resorted to for set up purposes to establish the proper relation between the work rest blade 33 and the Voperative face of the regulating wheel' 31 and to position said parts with respect to the grinding wheel and establish Athe desired size of -the grinding throat therebetween. After the parts have been once set up the clamp 26 is tightloosened whereupon the two slides move as a unit, which movement howor .the reduction in the size of the grinding wheel For this purpose there is provided an adjusting screw 130 having its threads received in a nut 131 rotatably journaled in the rear wall of the bracket' or housing 28. `The other end of therscrew 130 is rotatably mountedl ina The latter movement is ever is'oniy necessary to take care/ofwheel wear 'I'he hydraulic medium ahead of the piston is dis- "15 and the screw is provided beyond with a pilot; or hand wheel 133 whereby it may are fed toward one another to reduce succeed- 1 ing through the swivel bracket 137 into the path l 144 so that when the segmental gear 141 reaches the limit of its movement when rotated in a bracket 132 secured to the rear end of the bed .iusted to operate when the work piece is a tenth this bracket of a thousandth oversize whereupon the wheels be rotated. The nut 131 is also adapted to be ing work pieces the said tenth of athousandth. rotated, for which purpose it has keyed or other- When the piston 147 reaches the end of its movewise secured to it a worm wheel134 meshing with ment, it through a pin 172, see Figure 12, ena worm 135 on one end of a worm shaft 136 rof gages a dog 173 on a slide rod 174 slidable through tatably journaled in a swivel bracket 137. Sesuitable bearings 175 formed on the swivel houscured to the extreme outer end of the worm ing 137. This movement of the rod 174 opens shaft 136 is a hand wheel 137a whereby the shaft the normally closed switch 163 against the yieldmay be manually rotated to make fine adjusting resistance of aspring 176. The rod 174 is proments of the slides 23and 25 as respects the bed vided therein with a pair of notches 177 co-oper- 15. Also carried by the worm shaft 136 is a ating with a spring loaded detent 178 whereby ratchet 138, see Figures 8 and 9, adapted to be the rod is held in its operative positions for either engaged by a pawl 139 pivoted at 140 to a segclosing the switch 163 or holding same open. mental gear 141 loosely joumaled on a sleeve 142' It will be appreciated that the work piece being carried by the swivel bracket 137. A spring 143 gaged is somewhat remote from the work piece abuts the end of theNpawl 139 tending tooscillate actually being operated upon so that the parts the end of the pawl toward the ratchet. Extendcannot be returned too rapidly to their normal positions because a continuous feed would take place until the sliding gage4 block 88 dropped to its normal position to break the contacts 118 and 119 for opening the switch 157. Therefore, the exhaust of the hydraulic medium from ahead of the piston when rotating the worm to feed the work toward the grinding wheel is unrestricted while when the parts are being returned totheir normal position the exhaust from the other end of the cylinder is restricted. Therefore, soon as the piston 146 reaches the end of its movement of oscillation of the pawl 139 is a throw out screw counterclockwise direction, and as seen in Figure 9, the pawl is disengaged from the ratchet so that the shaft 136 may be rotated manually through thehand wheel 137a.

The gear teeth 145 of the gear lil mesh with a rack 146 secured to or formed integral with a piston 147. I'he piston 147 is contained within a cylinder 148 formed integral with the swivel to the left, as seen in Figure 9, the solenoid 152 bracket 137. 'I'he bracket 137 is further formed is de-energized through the opening of the switch with a valve chamber 149 containing valve spool 63,

ment of the grinding throat.' 'me choke vain 179 is so adjusted as to insure that the work piece the time the wheels other side by means of a wire 164 with the remaining lead 159 or 160, There is also shown in tion takes place, if necessary.

this figure diagrammatically a tank or sump 165'/ From the foregoing it will be noted that an containing an hydraulic medium, preferably 011,. improved sizing mechanism has been provided which is adapted to be drawn therefrom through forautomatically compensating for the sin of a pipe 166 by a-pump 167 and discharged under work pies being produced and insuring memo. pressure into` the conduit 168 which terminates duction of 9,11 work pieces within the me limit. in the valve casing 149. The spool valve 150 withof tolerane in the casing connects the pressure conduit 16B what is mined is: with a port or conduit 169 which terminates at 1 In a machine tool orgization the combb one end of the cylinder 148, for actuating. the nat- Piston therein to the left, as seen in Figure 9. porolo.::nzglumtrzzwnzhtg's neanstlgr actuating the work axially -of itself a o m1, terminating 1n the valve casing 149 where it is smntble gggppothatteombmmt of connected with the dischre conduit 171- The the work and adapted to. bemoved if the work a movement of the piston rotates the segmental above the desiredsize means operable by the Seal' 141 which thmugh the ratchet and pawl ro' 'axial shifting of the member for effecting a reltates the worm shaft 136 for rotating the worm charged from the cylinder through a conduit 170 adapted to peripherally support the work, and means supporting the axially shiftpieces as they pass 35 supported vby said able member for adjustment to disposesame in a plane parallel with the supporting surface of the work support. l

2. In a centerless grinder the combination of 5 a bed, a pair of opposed grinding and regulating wheels mounted thereon and forming a grinding throat therebetween, a work rest blade subtending the grinding throat, a trough disposed be; yond the grinding throat for receiving work therefrom, feeding means for shifting one of the wheels toward the other for varying the size of the grinding throat, an L- shaped bracket supported above the blade and trough and having one arm thereof cylindrical for bearing purposes, an axially shifted member supported by said bearing for contact with and adapted to be axiallyvadjusted by the work when the said work is above the desired size, the other arm of the bracket being of hollow rectangular cross section, control means in said hollow arm for energizing the feeding means upon actuation of theaxially shiftable member.

3. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels mounted thereon and forming a grinding throat therebetween, a work rest blade subtending the grinding throat, a trough disposed beyond the grinding throat for receiving work pieces as they pass therefrom, feeding means for I shifting one of the wheels toward the other for varying the size of the grinding throat, an L- shaped bracket supported above the blade and trough and having one arm thereof cylindrical for bearing purposes, an axially shifted member bearing for contact with and adapted to be axially adjusted by the work when the said work is above the desired size, the other arm of the bracket being of hollow rectangularcross section, control means i n said hollow arm for energizing the feeding means upon actuation `of the axially shiftable member, said control means including a plurality of multiplication levers adapted to complete an electrical circuit, and an electrical circuit between the control means and feeding means.

4. In a. sizing mechanism for use with grinding machines the combination with a bracket, of an oscillatory gaging head mounted in the bracket, an axially shiftable member carried by the bracket for movement in a truly axial direction, means connecting the member with the head for insuring such axial movement, a bell crank pivotally mounted on the gaging head, means for connect- 'ing the bell crank with the' member for oscillation in a plane parallel with the plane of movement of the member, a rod extending axially through the gaging head for axial movement upon oscillatory movement of the bell crank, and amplication levers oscillatedby the axial shifting of the rod for completing an electrical circuit.

5. In a sizing mechanism for use with grinding machines the combination with a bracket, of an oscillatory 4gaging head mounted in the bracket, an axially shiftable member carried bythe bracket for movement in a truly axial direction, means connecting the member with the head for insuring such axial movement, a bell crank pivotally mounted on the gaging head, means for connecting the bell crank with the member for oscillation in a plane parallel with the plane of movement `of the member, a rod extending axially through the gaging head for axial movement `upon oscillatory movement of the bell crank, am-

plification levers oscillated by the axial shifting of the rod for completing an electrical circuit,

tween the amplification levers, and additional yielding means for eliminating back lash between the parts carried by the gage head.

6. In a sizing mechanism for use with grinding machines the combination with a bracket, of an oscillatory gaging head mounted in the bracket, an axially shiftable member carried by the bracket for movement in a truly axial direction, means connecting the member with the head for insuring such axial movement, a bell crank pivotally mounted on the gaging head, means for connecting the bell crank with the member for oscillation in a plane parallel with the plane of movement v of the member, a rod extending axially through the gaging head for axial movement upon oscillatory movement of the bell crank, amplification levers oscillated by the axial shifting of the rod for completing an electrical circuit, yieldable means for eliminating back lash between the amplification levers, additional yielding means for eliminating back lash between the parts carried by the gage head, and means mounting the gage head and parts carried thereby for oscillatory adjustment relative to the bracket for aligning the member with the work as it passes thereby.

7. In a centerless grinder comprising opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade disposed in the grinding throat and having an angled operative 'surface inclining in the general directionV of the regulating wheel, guides mounted on opposite sides` of the work rest blade and co-operating therewith to form a work receiving trough of a width substantially equal-to the diameter of the work, means for adjusting the position of said guides as respects the work rest blade, a bracket exteriorly of the grinding throat, a gage mechanismcarried by the bracket and including a gage head overlying the angled surface of the blade, an axially shiftable member carried by the head for contact with the work, and means mounting the gage head in the bracket for oscillatory movement relative thereto to align the operative surface of the axially shiftable member with the angled top of the blade.

8. In a centerless grinder comprising opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade disposed in the grinding throat and having an angled operative surface inclining in the general direction of the regulating wheel, guides mounted on opposite sides of the work rest blade and cooperating therewith to form a work receiving.

trough of a width substantially equal to the diameter of the work, means for adjusting the position i of said guides as respects the work rest blade, a bracket exteriorly of the grinding throat, a gage mechanism carried by the bracket and including a gage head overlying the angled surface of the blade, an axially shiftable member carried by the head for contact with the work, means mounting the gage head in the bracket for oscillatory movement relative thereto to align the operative surface of the axially shiftable member with thel mechanism carried by the bracket and including a gage head overlying the angled surface of the blade, an axially shiftable member carried by the head for contact with the work, means mounting the gage head in the bracket for oscillatory move- -ment relative thereto to align the operative surface of the axially shiftable member with the angled top of the blade, means for effecting a relative feed between the work and grinding wheel, an electrical circuit including the feeding means for effecting the relative feed between the work and grinding wheel, and means carried by the bracket operable by the axially shiftable member of the work head for completing the electrical'circuit, said means comprising contact members in the electrical circuit, means adjusting the space between said contacts, and movement amplification levers operable by the axial shifting of the member.

10. In a sizing device for use with machines comprising a bracket, an axially shiftable member for contact with the work, flat fulcrums connecting the member with the bracket whereby the member is suspended for movement,

in an axial direction only, a bell crank lever, a flat fulcrum supporting the bell crank, a fiat fulcrum connecting the axially shiftable member with one arm of the bell crank, an axially shiftable rod, a fiat fulcrum connecting the bell crank with the rod whereby axial shifting of the member effects an oscillation of the bell crank and axial shifting of the rod in a single plane, and means operated by the axial shifting of the rod for completing an operative electrical circuit.

11. In a sizing device for use with grinding machines comprising a bracket, an axially shiftable member for contact with the work, fiat fulcrums connecting the member with the bracket whereby the member is suspended for movement in an axial direction only, a bell crank lever, a nat fulcrum supporting the bell crank, a fiat fulcriim connecting the axially shiftable member with one arm of the bell crank, an axially shiftable rod, a flat fulcrum connecting the bell crank with the rod whereby axial shifting of the member effects an oscillation of the bell crank and axial shifting of the rod in a single plane, and means operated by the axial shifting of the rod for completing an operative electrical circuit, said means comprising oscillatory amplification levers, fiat fulcrums connecting said levers to the bracket, flat fulcrums connecting said levers to one another, and electrical contacts adapted to be closed upon movement of said levers.

12. In a sizing device for use with grinding machines comprising a bracket, an axially shiftable member for contact with the work, flat fulcrums connecting the member with the bracket whereby the member is suspended for movement in an axial direction only, a bell crank lever, a flat fulcrum supporting the bell crank, a at fulcrum connecting the axially shiftable member with one arm of the bellcrank, an axially shiftable rod, a flat fulcrum connecting the bell crank with the rod whereby laxial shifting of the member eifects an oscillation of the bell crank and axial shifting of the rod in a single plane, means operated by the axial shifting of the rod for completing an operative electrical circuit, said means comprising oscillatory amplification levers, fiat fulcrums connecting said levers to the bracket, at fulcrums connecting said levers to one another, and electrical contacts adapted to be closed upon movement of said levers, and yieldable means operable to eliminate all back lash between the parts.

13. In a sizing device for use with grinding machines comprising a bracket, an axially shiftable member for contact with the work, fiat fulcrums connecting the member with the bracket whereby the member is suspended for movement in an axial direction only, a bell crank lever, a fiat fulcrum supporting the bell crank, a flat fulcrum connecting the axiallyA shiftable member with one arm of the bell crank, an axially shiftable rod, a flat fulcrum connecting the bell crank with the rod whereby axial shifting oi' the member effects an oscillation of the bell crank and axial -shifting of the rod in a single plane, means operated by the axial shifting of the rod for completing an operative electrical circuit; said means comprising oscillatory amplification levers, flat fulcrums connecting said levers to the bracket, at fulcrums connecting said'levers to one another, and electrical contacts adapted to be closed upon movement of said levers, yieldable means operable to eliminate all back lashbetween the parts, and means mounting the axially shiftable member and parts operated thereby for adjustment of the parts relative to the bracket for aligning same with the work to pass thereunder.

14. In a mechanism of the class described the combination with a bed, a tool on the bed, a work support adjacent the tool, and means for effecting a feed between 'the tool and work, of a sizing device for controlling the feed means, said sizing device including a contact member disposed adjacent the work support for engagement with the work as it passes from the tool when the said work is above the desired size, amplification levers associated with the sizing device, flat fulcrums connecting.l the levers with one another whereby they are constrained to move in a given direction, a housing containing the contact member and amplification levers, a bracket supporting the housing, and means adjusting the position of the housing relative to the bracket towar and from the work support.

15. In a mechanism of the class described the combination with a bed', a tool on the bed, awork support adjacent the tool, and means for effecting a feed between the tool and work, of a sizing device for controlling the feed means, said sizing device including a contact member disposed adjacent the work support for engagement with the work as it passes from the tool wher. the said work is above the desired size, amplification levers associated with the sizing device, and at fulcrums connecting the levers with one another whereby they are constrained to'move in a given direction, said contact member being mounted for adjustment to align same in parallelism with the work support. v

16. The combination with a machine tool organization including a tool, a work support adjacent the tool, and means for eifecting a relative feed between the work support and tool, of a sizing mechanism overlying the work support for engagement with the work as it passes from the machine comprising a contact member, a housing supporting the contact member, ampliiication levers within said housing, flat fulcrums connecting said contact and amplication levers with the housing and with one another for movement in denite planes, and means further supporting the contact member for adjustment-relative to the housing to permit same to be disposed parallel with the work support.

17. The combination with a machine tool organization including a tool, a work support adjacent the tool, and means for eiecting a relative feed between the work support and tool, o! a sizing mechanism overlying the work support for engagement with the work as it passes from the machine comprising a'. contact member, a housing supporting the contact member, amplication'levers within said housing flat fulcrums connecting said contact and amplification levers with the housing and with one another for movement in definite planes, means further supporting the contact member for adjustment relative to the housing to permit same to be disposed parallel with the work support, hydro-electric means for actuating the feeding mechanism, and electrical contacts operable by the amplcation levers for energizing the hydro-electric means and actuating the feeding mechanism.

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