US2025714A - Grinding machine - Google Patents

Description

1935' G. w. BINNS 2,025,714

- GRINDING MACHINE v Filed June 7, 19:52 4 Sheets-Sheet -2 Dec. 31, 1935. I w, B|NN5 2,025,714

GRINDING MACHINE I Filed June 7, 1952. 4 Sheets-Sheet 3 Dec. 31, 1935. aw. BINNS enmnme mcrmm Filed June 7, 1932.

4 v Sheets-Sheet 4 ulnhulllll Patented Dec. 31, 1935 t i r 2 025,714,

\ UNITED STATES PATENT OFFICE GRINDING MACHINE George W. Binns, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, hio, a corporation of Ohio Application June 7, 1932, Serial No. 615,863

20 Claims. (01. 51-129) This invention relates to machine tools and essimilar reference characters are employed to depecially to improvements in grinding machines. note the same or similar parts.

An object of the invention is the provision of A machine embodying this invention may-coman automatic centerless grinder for grinding the prise a bed l0 having formed on its upper surface terminal portion of work pieces such as headed a guideway II for a slide l2 which in turn is 5 studs, tappets and the like. provided with a guideway l3 for a bracket or Another object of the invention is the proviupper slide M. The bed III has further rising sion of improved means for actuating the said therefrom at one side thereof a pedestal bearing flat surfaces of the head or stud relative to the IS in which is journaled a spindle. I6 for a grind- 0 grinding wheel while the work piece is being roing wheel I1. The upper slide or bracket I4 has tated. u d to it a h us ng or head l8 in whichis A further object of the invention is the projournaled a spindle l9 to the end of which is vision of improved feeding and ejecting means secured a wheel 20. The wheel 20,-see Figure 3, for properly positioning a work piece on a supis provided in its periphery with a notch 2| havport and ejecting it therefrom at the concluing on each side thereof vertical faces 22 and 23. sion of the grinding operation. From the point 24 0f the face 23 the periphery 25 Other objects and advantages of the present of the wheel gradually rises, which rise termiinvcntion should be readily apparent by referhates at a point 26 from which the periphery. 21 ence to the following specification consideredvin is substantially concentric with the axis of the conjunction with the accompanying drawings, spindle 19. This concentric periphery terminates 20 forming a part thereof, and it is to be understood at a point 28 where it joins the verticalface 22. that any modifications may be made in the exact Thegrinding w eel I] d regulatin Wheel structural details there shown and described withare respectively rotated at a high grinding rate in the scope of the appended claims, without deof speed and a slow work controlling rate ofis v the work, while the latter controls the rotation In the drawings: of the work and feeds same relative to the grind- Figure 1 is a front elevation of a centerless ing wheel. The wheels are spaced from one angrinding machine embodying the improvements other to forma work receiving throat in which of this'invention. the work piece is positioned. In order to support 30 Figure 2 is a top pl n View f the machine shown the work in the grinding throat, there is provided in Figure 1. a work rest blade 29 having an inclined operative Figure 3 is a fragmentary longitudinal sectional surface 30 which inclines in the direction of the a view through the machine particularly illustratperiphery of the wheel 20; The work rest blade 29 ing the grinding throat as seen from line 33 on. is secured in a block 3| mounted on the end of a v Fi ure 2; supplementary slide 32 which has formed on its Figure 4 is an enlarged fragmentary elevational under surface a dove-tailed guideway 33 receivview of the parts shown in Figure 3 which form n a rrespond y s ap d ton ue 34 formed the grinding throat, on the upper surface of the lower slide l2. The

parting from or exceeding the spirit of the in speed, the former effecting the stock removal from 25 Figure 5 is an enlarged transverse sectional block 3| has projecting -from its forward face cars view through the machine as seen from line 5-5 u 35 through w c Passes '8- PiVOt D 35 o Figure 2, passing also through a bell crank lever 31. The

Figure 615 an enlarged fragmentary g-, lever 31 has rotatably mounted at one end of its View of the parts as seen from line on one aim 38 a pressureroller 39 which is adapted ure 5.

Figure 7 is an end elevation! View of the regw periphery of the wheel 20. The other arm 4| of lating or control wheel and parts associated thereh bell crank 31 is nkgwise pmvlded on its end with as Seen from m e on Figure v with a roller 42 which co-operates with a cam 30 Figure 8 is an enlarged Section 81 View through carried by thewheel 20 for removiug the pressure roller 39 from the work at the time a new work piece is tobe positioned in the grinding throat. In order to actuate the lever 31 about the axis of its pivot 36, the arm *4 I has secured at 43 one end of a spring 44 which has its other end secured at the grinding wheel and nose of the grinding wheel spindle illustrating a mechanism whereby the saidwheel is adjusted toward the work to take up for wear on the wheel, I

Throughout the severalviews of the drawings 45 to the slide 32, and tends tooscillate the bell 55 to engage the work 40. and hold same against the crank in a clockwise direction or toward the Wheel 20.

For positioning and adjusting the wheel 20 relative to the grinding wheel in accordance with the particular work piece being operated upon, the

upper slide or bracket M has secured therein a nut 46 in threaded engagement with an adjusting screw 41 which has its rear end rotatably journaled in a bracket 48 carried by an extension 49 of the bed l0. Secured to the projecting portion of the screw 41 beyond the bracket 48 is a pilot or hand wheel 50 whereby the adjusting screw 41 is actuated. In order to shift the upper andv lease of clamp 5| secure the lower slide |2 to the bed so that the upper slide may be adjusted independently.

From the foregoing description of the wheel 20 it will be noted that the vertical face 23 shifts the work intoposition for engagement with the grinding wheel whereupon the eccentric portion 25 feeds the work relative to the wheel at the normal feeding speed until the concentric portion 2'! is reached. At this time relative-movement between the work and grinding wheel is held in abeyance to permit sparking out of the grinding wheel; and work and to provide the desired finish on the work. Upon reaching the point 28 the vertical face 22 effects a rapid withdrawal of the work from the grinding wheel until it reaches the discharge notch 2| whereupon the work is carried from the machine and disposed in a suitable receptacle placed for its reception. In order with the movement of the work. For this reason the slide 32 has pivoted to it by means of the pin 53 one end of a lever 54. This lever 54 is pivoted at 55 intermediate its ends to a lug or ear 56 projecting from the head or housing I8. An antifriction roller 51 is rotatably carried by the upper end of the lever 54 and is adapted to be received in cam track 58 formed on the rear surface of the wheel 29. The cam track 58 bears a definite relation to the periphery of the wheel 20 so that as the said periphery shifts the work 40 toward the grinding wheel, it likewise shifts the slide 32 so that the blade 29 is at all times beneath the -Work and rotatably supporting it during the Figures 5, 6 and 7, the hopper mechanism terminates in a fixed guide or support 6|! on which is slidably reciprocated a slide 6|. The slide 6| is adapted to be shifted from the position shown in Figure 5 into the grinding throat and retracted therefrom once for each rotation of the wheel 29.

Thisreciprocation of the slide 6| takes place during a very small portion of a single rotation of the wheel 20 and for which purpose suitable mechanism is mounted in the base of the hopper 59 and forming no part of this invention, it being comes into play. .In order to position a work piece onthe reciprocating slide 6| a ram head 62 is provided which disposes successive work pieces on the slide with one end thereof behind a shoulder 63 formed on the slide 6| which shoulder 5 acts as a pusher for the work as the slide is moved.

The work rest block 3|, see Figure 6, has secured to its side an arm 64 rising upwardly above the work rest blade 29 and terminating in a head 65. Astripper latch 66 is pivoted at 61 to the head 65 of the arm 64 which stripper has connected to it one end of a spring 68, the other end being connected to the head 65. The spring 68 tends to oscillate the stripper. in a clockwise direction or with its stripping point toward the work rest blade. A pin 16 projects from the head 65 to limit the clockwise oscillation of the stripper 66.

The operation of these parts is as follows: As the slide 6| moves forward with the rear end of the work piece butting the shoulder 63, the forward or head end of the work engages the stripper nose 69, which as will be noted in Figure 5, has a tapered side acting as a cam to raise the stripper nose above the head of the work as it is pushed into the grinding throat. As soon as the head passes beyond the nose 69 the spring 68 expands to return it to its normal position so that upon retracting movement of the slide 6|,

the nose 69 engages behind the head holding the work against retractive movement as the slide 6| is retracted. Continual retraction of the slide 6| permits the work to be dropped onto the inclined surface 30 of the blade 29. The parts are so timed that as the work drops onto the surface 36 the point 24 of the periphery of the wheel 20 is in position to prevent inadvertent discharge of the work from the blade through gravity.

As was noted above, the pressure roller 39 must be rendered inoperative during the loading of a new, unfinished work piece within the throat. For this reason the wheel 20 has secured thereto a segmental camplate having a rapidly rising cam surface 12 terminating in atrack I3 concentric. with the axis of the wheel 20. As the cam 12 engages the roller 42 the bell crank 31 is oscillated in a counter-clockwise direction about the axis of the pivot 36 for disposing the pressure roller 39 in the position shown in Figure 3. The roller is held in this position by the track 13 during the loading of the work.

In order that the new work piece be fed into the grinding throat at the time the parts are in the position to receive same, the wheel 26 has secured'to its forward face atripping cam 14 adapted to engage the nose l5 of a pivotally mounted crank 16 pivoted at 11 to a bracket 18 mounted on the upper surface of the slide |2. The other end of the crank 16 has pivoted to it at 19 a link 80 which trips off the hopper actuating mechanism mounted within the base of the hopper above referred'to.

The lower slide 32 has secured to its upper surface a bracket 8| by .means of a bolt 82 and has adjustably mounted in its upper end a stop member 83 here shown as a screw whereby the operative position of its nose 84 may be adjusted. A lock nut 85 is provided for securing the stop in amusted positions and for holding same against inadvertent movement. The nose 84 insures a definite stop against which the work piece is fedand held by means of the pressure roller 39. This roller, as shown in Figure 5, has its axis disposed at an angle or skewed to the axis 76 of the work 40 and tends to exert a feeding component on the work in the direction of. the grinding wheel which is limited as above noted by the nose 84.

As is well known, grinding wheels are subjectv to wear and must periodically be trued to maintain a clean sharp face and must be adjusted to take up for this wear and truing. As shown in Figure 8, the grinding wheel II is carried by a collet 88 which is keyed as at 81 to a split sleeve 88. The sleeve 88 is in turn keyed at 88 to the tapered nose 98 of the grinding wheel spindle IS. The spindle nose 88 terminates in. a reduced threaded portion 8| receiving a nut 82 which has its inner end butted against a shoulder formed by a counterbore in the sleeve 88. Actuation of the nut 92 toward the left, as seen in Figure 8,

minating in a head 94 received in a slot 95 formed in the sleeve 88. A screw driver slot 88 is formed in the head 84 so that the screw may be readily rotated. It is believed that the adjustment of the grinding wheel l'l relative to the spindle IE will be readily appreciated from the foregoing description and by reference to Figure 8.

It should be noted that there has been provided a centerless grinding machine for grinding the flat surface of headed articles such as tappets and the like in an automatic, expeditious manner, which insures not only the proper finish on the work, but also that the work will be hel within close limits of accuracy.

What is claimed is:

1. In a grinding machine for grinding the terminal portion of a cylindrical work piece the combination of a grinding wheel having an operative lateral or side face, a rotatable cam shaped friction control wheel laterally offset relative to the grinding wheel on the side of its operative lateral side face and having its operative surface so formed as to feed the work relative to the side face of the grinding wheel and present the entire terminal portion of the work to the grinding wheel during asingle revolution of the friction control wheel, and a work support for peripherally supporting the work while'in contact with the cam shaped friction control wheel and during the grinding of its terminal portion. a

2. In a grinding machine for grinding the terminal portion of a cylindrical work piece the combination of a grinding wheel having an operative lateral or side face, a rotatable cam shaped friction control wheel laterally offset relative to the grinding wheel on the side of its operative lateral side face and having its operative surface so formed as to feed the work relative to the side face of the grinding wheel and present the entire terminal portion of the work to the grinding wheel during a'single revolution of the friction control wheel, a work support for peripherally supporting the work while in contact with the cam shaped friction control wheel and during the grinding of its terminal portion, and means for holding the work on the work support and in contact with the operative surface of the cam shaped regulating wheel. I

3. In a grinding machine for grinding the terminal portion of a cylindrical work piece the combination of a grinding wheel having an op- 5 erative lateral or side face, a rotatable cam shaped friction control wheel laterally ofiset relative to the grinding wheel on the side of its operative lateral side face and having its operative surface so formed as .to feed the work relative to the side face of the grinding wheel and present the entire terminal portion of'the work to the grinding wheel during a single revolution of the'friction control wheel, a work support for peripherally supporting thework while in contact with the cam shaped friction control wheel and during the grinding of its terminal port-ion, means for holding the work on the work support a and in contact with the operative surface of the cam shaped regulating wheel, and means for successively placing a work piece on the work sup porting mechanism adjacent the face of the regulating wheel.

4. In a. grinding machine for grinding the ter minal portion of a cylindrical work piece the combination of a grinding wheel having an operative lateral or side face, a rotatable cam shaped friction control wheel laterally offset relative to the grinding wheel on the side of its operative lateral side'face and having its operative surface so formed as to feed the work relative to the side face of the grinding wheel and present the entire terminal portion of the work to the grinding wheel during a single revolution of the friction control wheel, a work support for peripherally supporting the work while in contact with the cam shaped friction control wheel and during the grinding of its terminal portion, means for holding the work onthe work support and in contact with the operativesurfa-ce of the cam shaped regulating wheel, means for successively placing a work piece on the work supporting mechanism adjacent the face of the regulating wheel, and means synchronizing the operation of the .last mentioned means with the rotation of the regulating wheel whereby a single work piece is disposed on the work supporting mechanism for each complete rotation of the friction control member.

5. In a centerless grinder for grinding the terminal portion of cylindrical articles ,the combination of a grinding wheel, an opposed control and feeding wheel, a work rest blade adjacent the periphery of the control and feeding wheel and forming between them a work receiving throat, means yieldably urging the work into contact 5.3 with'the control wheel while within the work receiving throat, means rendering the yielding holding means inoperative, and means feeding work pieces into thework receiving throat when the yielding means is inoperative.

6. In a centerless grinder of the class described the combination of a grinding wheel, an opposed control wheel, said wheels being operated respectively at a high grinding rate of speed and a relatively slow work controlling and feeding rate of speed, the control wheel having a cutaway portion, an eccentric feeding portion and a notched d scharging portion, a workrest blade adjacent the periphery of the wheel for supporting a work piece while in peripheral engagement with the wheel, yieldable pressure means for holding the work in contact with the work rest blade and perlphery of the control wheel, said pressure means limiting the movement of the work toward the grinding wheel.

7. In a centerless grinder of the class described the combination of a grinding wheel, an opposed control wheel, said wheels being operated respectively at a high grinding rate of speed and a relatively slow work controlling and feeding rate of speed, the control wheel having a cutaway portion, an eccentric feeding portion and a notched discharging portion, a work rest blade adjacent the periphery of the wheel for supporting a work piece while in peripheral engagement with the wheel, yieldable pressure means for holding the work in contact with the work rest blade and periphery of the control wheel, said pressure means exerting a feeding component on the work axially thereof toward the grinding wheel, means for limiting the movement of the work toward the grinding wheel, a feed slide shiftable into overlying relation with the work rest blade for placing a work piece on the blade, and means above the work rest blade for stripping the-work from the slide upon retraction thereof.

8. In a centerless grinder of the class described the combination of a grinding wheel, an opposed control wheel, said wheels being operated respectivey at a high grinding rate of speed and a relatively slow work controlling and feeding rate of speed, the control wheel having a cutaway portion, an eccentric feeding portion and a notched discharging portion, a work rest blade adjacent the periphery of the wheel for supporting awork piece while in peripheral engagement with the wheel, yieldable pressure means for holding the work in contact with the work rest blade and periphery of the control wheel, said pressure means.

exerting a feeding component on the work axially thereof toward the grinding wheel, means for limiting the movement of the work toward the grinding Wheel, a feed slide shiftable into overlying relation with the work rest blade for placing a work piece on the blade, means above the work rest blade for stripping the work from the slide upon retraction thereof, and means retracting the pressure roll during the shifting of the slide into overlying relationship with the blade.

9. In a centerless grinder of the class described the combination of a grinding wheel, an opposed control Wheel, said wheels being operated respectively at a high grinding rate of speed and a relatively slow work controlling and feeding rate of speed, the control Wheel having a cutaway portion, an eccentric feeding portion and a notched discharging portion, a work rest blade adjacent the periphery of the wheel for supporting a work piece while in peripheral engagement with the wheel, yieldable pressure means for holding the work in contact with the Work rest blade and periphery of the control wheel, said pressure roll exerting a feeding component on the work axially thereof toward the grinding wheel, means for limiting the movement of the work toward the grinding wheel, a feed slide shiftable into overly! ing relation with the work rest blade for placing a work piece on the blade, means above the work rest blade for stripping the work fromthe slide upon retraction thereof, means retracting the pressure roll during the shifting of the slide into overlying relationship with the'blade, and means synchronizing the rotation of the control wheel with the retraction of the pressure roll and the shifting of the feed slide.

10. In a grindingmachine of the class de scribed for grinding cylindrical work pieces the combination of a grinding wheel, a work rest blade for peripherally supporting a work piece, a carrier for the work rest blade mounted on the bed for movement relative thereto, a rotatable cam shaped control wheel for controlling the I rotation of the work and feeding it relative to 5 the grinding wheel to eflect a stock removal therefrom, and means for shifting the work rest blade carrier toward the grinding wlieel simultaneously with the shifting of the work relative to the grinding wheel to support the work during the grinding operation.

11. In a grinding machine of the class described for grinding cylindrical work pieces the combination of a grinding wheel, a work rest blade for peripherally supporting a work piece, a carrier for the work rest blade mounted on the bed for movement relative thereto, a rotatable cam shaped control wheel for controlling the rotation of the work and feeding it relative to the grinding wheel to effect a stock removal therefrom, and means for shifting the work rest blade carrier toward the grinding wheel simultaneously with the shifting of the work relative to the grinding wheel to suport the work during the grinding operation, including a cam rotatable in timed relation with the rotation of the control wheel, and a link between the blade carrier and cam. 12. In a grinding machine of the class described for grinding cylindrical work pieces the combination of a grinding wheel, a work rest blade for peripherally supporting a work piece, a carrier for-the work rest blade mounted on the bed for movement 'relative thereto, a rotatable cam shaped control wheel forcontrolling the rotation of the work and feeding it relative to the grinding wheel to eifect a stock removal therefrom, means for shifting the work rest blade carrier toward the grinding wheel simultaneously with the shifting of the work relative to the 40 grinding wheel to support thework during the grinding operation, including a cam rotatable in timed relation with the rotation of the control wheel, and a link between the blade carrier and cam, and a yieldably actuated pressure roll carried by the carrier for yieldably holding the Work in contact with the work rest blade and the periphery of the control wheel during the shifting of the work while being operated upon.

13. In a grinding machine of the class described for grinding cylindrical work pieces the combination of a grinding wheel, a work rest blade for peripherally'supporting a work piece, a carrier for the work rest blade mounted on the bed for movement relative thereto, a rotatable earn shaped control wheel for controlling the rotation of the work and feeding it relative to the grinding wheel to effect a stock removal therefrom, means for shifting the work rest blade carrier toward the grinding wheel simultaneously with the shifting" of the work relative to the grinding wheel to support the work during the grinding operation, including a cam rotatable in timed relation with the rotation of the control wheel, and a link between th blade carrier and cam, a yieldably actuated pressure roll carried by the carrier for yieldably holding the work in contact with the work rest blade and the periphery of the control wheel during the shifting of the work while being operated upon, said pressure roll having its axis skewed as respects the axis of the work for feeding the work at an angle to the movement thereof as effected by the cam shaped control member and means for limiting said angular movement of the work.

14. In a grinding machine for grinding cylindrical work pieces the combination of a'bed, a grinding wheel rotatably mounted on said bed, a work rest blade for supporting a work piece in operative relation to the grinding wheel, and a pair of cam shaped members, one for shifting the work relative to the grinding wheel to effect a 'Stock removal therefrom and effect and control the rotation thereof and the second memberfor shifting the work support simultaneously with the shifting of the work relative to the wheel.

15. In a grinding machine for grinding cylindrical work pieces the combination of a bed, a grinding wheel rotatably mounted on said bed, a work rest blade for supporting a work piece in operative relation to the grinding wheel, a pair of cam shaped members, one for shifting the work relative to the grinding wheel to effect a stock removal therefrom and effect and control the rotation thereof and the second member for shifting the work support simultaneously with the shifting of the work relative to the wheel, and yieldable means for holding the work in contact with the work rest blade and said work feeding and rotation control cam member.

16. In a grinding machine for grinding cylindrical work pieces the combination of a bed, a grinding wheel rotatably mounted on said bed, a work rest blade for supporting a work piece in operative relation to the grinding wheel, a pair of cam shaped members, one for shifting the work relative to the grinding wheel to effect a stock removal therefrom and efiect and control the rotation thereof and the second member for shifting the work support simultaneously with the shifting of the work relative to the wheel, yieldable means for holding the work in contact with the work rest blade and said work feeding and rotation control cam member, and means for intermittently supplying work pieces to the work rest blade.

17. In a grinding machine of the class described for grinding the terminal portion of a circular work piece the combination of a bed, a grinding wheel rotatably mounted thereon and having an operative side face, a work rest blade laterally spaced with respect thereto for movement transversely of the said lateral face, a rotatable friction control and feeding member in tandem relation with the blade, said friction control and feed member having a cam shaped peripheral surface for effecting said feed, and a cam member substantially co-axial with the friction control and feed member and rotatable in timed relation therewith for effecting the transverse movement of the blade relative to the wheel simultaneously with the shifting of the work.

18. In a grinding machine of the class described for grinding the terminal portion of a circular work piece the combination of a bed, a grinding wheel rotatably mounted thereon and having an operative side face, a work rest blade having an operative side face, a work rest blade laterally spaced with respect thereto, for movement transversely of the said lateral face, a rotatable friction control and feeding member in tandem relation with the blade, said friction 5 control and feed member having a cam shaped peripheral surface for effecting said feed, a cam member substantially co-axial with the friction control and feed member and'rotatable in timed relation therewith for effecting the transverse movement of the blade relative to the wheel simultaneously with the shifting of the work, and yieldably actuated means for holding the work in peripheral engagement with thework rest blade and rotation control member.

19. In a grinding machine of the class described for grinding the terminal portion of a circular work piece the combination of a bed, a grinding wheel rotatably mounted thereon and 20 laterally spaced with respect thereto for movement transversely of the said lateral face, a ro tatable friction control and feeding member in tandem relation with the blade, said friction control and feed member having a cam shaped peripheral surface for effecting said feed, a cam member substantially co-axial with the friction control and feed member and rotatable in timed relation therewith for effecting the transverse movement of the blade relative to the wheel simultaneously with the shifting of the work, yieldably actuated means for holding the work in peripheral engagement with the work rest blade and rotation control member, and means for intermittently supplying work pieces to the work rest blade.

20. In a grinding machine of the class described for grinding the terminal portion of a circular work piece the combination of a bed, a grinding wheel rotatably mounted thereon and having an 40 operative side face, a work rest blade laterally spaced with respect thereto for movement transversely of the said lateral face, a rotatable friction control and feeding member in tandem relation with the blade, said friction control and feed' 5 member having a cam shaped peripheral surface for effecting said feed, a cam member substantially co-axial with the friction control and feed member and rotatable in timed relation therewith for efiecting the transverse movement of the blade relative to the wheel simultaneously with the shifting of the work, yieldably actuated means for holding the work in peripheral engagement with the work rest blade and rotation control member, means for intermittently supplying work pieces to the work rest blade, and means for rendering the yieldable holding means inoperative during the supplying of work pieces to the blade.

GEORGE w. BINNS.

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