Патент USA US2412730код для вставки
Dem 17, 19.46- J. E. HECKETHORN FEEDING AND EJECTING DEVIC 2,412,730 E FOR CENTERLESS GRINDERS Filed July 7, 1945 2 Sheets-Sheet l 1% /7 /0 . INVENTOR. joH/v, [am/1400 f/zcmsn/o?/v. ATTORNEY. J. E. HECKETHORN 2,412, 730 FEEDING AND EJECTING DEVICE FOR CENTERLESS GRIND Filed July 7, 1945 ERS 2 Sheets-Sheet 2‘ Patented Dec. 17, 1946‘ v 2,412,730 31 PATENT OFFICE 2,412,130 FEEDING AND EJECTING DEVICE FOR 4 .CENTERLESS GRINDERS J 0hr: E. Heckethorn, Denver, Colo.v Application July 7, 1945, Serial No. 603,658 , - . (Cl. 51-103). 3 Claims. 1 This invention relates to an automatic infeed and ejecting attachment for centerless grinding machines and is designed more particularly as an - improvement over the invention illustrated in copending application Serial No. 497,102, now Patent Number 2,379,961. . _ The principal object of this invention is to pro vide a simple and highly e?icient pneumatically numeral as follows: bed HJ', grinding wheel H, feed wheel l2, feed wheel motor housing [3, feed wheel carriage I 4, feed wheel carriage feed screw l5, feed wheel feed sleeve 16, hand wheel 11, grinding wheel motor I 8, grinding wheel hous ing l9, work rest 20, work rest holder 2|, lower slide 22, ejection plunger 23, and work pieces 54. In such a machine the work being ground rests operated mechanism for automatically placing workpieces in a centerless grinding machine and 10 upon the work rest 20 between the grinding wheel l_ land the feed wheel l2. The feed screw I5 is removing the ?nished pieces therefrom. Another object of the invention is to so con- > rotated by means of the hand wheel l1,'to bring the feed wheel carriage l4 adjacent the work. struct the device that it will operate synchronous The feed sleeve I 6 is then rotated on the feed ly with the advance and withdrawal of the feed screw to move the carriage l4 forwardly fora. wheel of a conventional centerless grinding ma present distance sufficient to bring the work to the , chine. A still further object is to provide a device of, required ?nished diameter. Therefor the amount of rotation of the feed sleeve l6 determines the this character which will be economical to ‘manu amount of grinding which will be done and the facture, rugged in structure and positive in opera sleeve must be circumferentially reciprocated a tion. preset distance for each article to be ground. The Other objects and advantages‘ reside in the de wear of the grinding wheel is adjusted during tail construction of the invention, which is de operation by rotation of the hand wheel l1. signed for simplicity, economy, and e?iciency. > This invention is designed to automatically These will become more apparent from the fol lowing description. ' In the following detailed description of the invention reference is had to the accompanying drawings which forms a part hereof. Like numerals refer to like parts in all views of the drawings and throughout the description. In the drawings: ‘ Fig. 1 is a side view of a typical centerless grind ing machine, illustrating the elements of the in vention in place thereon; er are shown shaded in the drawings. ' Fig. 2 is an enlarged, longitudinal section through the work ejecting mechanism employed in the improved attachment; place the work pieces 54 between the wheels ll and I2; rotate the feed sleeve It at the proper speed'and for the proper distance to bring the workpiece to the acquired ?nished diameter; then ' withdraw the feed wheel l2 by return recipro cation of the feed sleeve l6; and eject the ?nished 30 work piece from between the wheels III and It’. With the exception of the grinding wheel I I, only the parts added to the standard centerless grind The un shaded parts will be found in all standard ‘ma 35 chines. ' _ The mechanism for reciprocating the feed sleeve I 6 is shown and described in detail in the ' Fig. 3 is a detail, cross-section, taken on the line said copending application, Serial No. 497,102., Fig. 4 is a similar cross-section taken on the In this invention the same mechanism is used and I 3-—3, Fig. 6; line 4-4, Fig. 2; 40 will be but brie?y described herein as follows: A base plate 24 is mounted on the motor hous ing l3 and carries an operating motor 25 which, through the medium of a V-belt 26 and a speed Fig. 6 is an enlarged cross-section through the reducer rotates a cam shaft 28. The shaft 28 grinding machine illustrating the attachment in} projects 21, from both faces of the speed reducer and 45 place thereon; taken on the line 6——6, Fig. 1; Fig. 5 is a similar cross-section taken on the line 55-45, Fig. 6; ' . Fig. '7 is a detail View illustrating a valve opera ting cam employed in the attachment; Fig. of the Fig. Fig. on the front face terminates in a large cam mem ber 29 provided with a face cam track. A rocker arm 30 is journalled in suitable hearings on the 8 is a detail view illustrating a face view plate 23 and projects both above and below the valve operated by the cam of 1; 60 latter. The upper extremity of the rocker arm 9 is a side view of the valve of Fig. 8; and terminates in a cam follower 3! which follows the 10 is a cross-section through the valve of face cam in the member 29 to impart a reciproca Fig. 9. ' _ tory movement to the rocker arm 30. The lower Standard parts of a typical centerless grinding machine are designated on the drawings by 55 part of the rocker arm 30 is connected to a crank member 32 on the feed sleeve l6. Thus, at each 2,412,780 medium of a toggle member 63 so that‘each re rotation of the cam ‘member 29, the feed sleeve ciprocation of the piston rod of the cylinder 46' i l6 will be rotated forward and back to move the will be communicated to the‘ ejector head‘ 6| to ' feed wheel |2 toward the work piece and away force the ?nished work piece from the work rest. \. , therefrom. The cylinder 46 is also adjustably supported from‘ ' . The, present invention makes use of the cam 5 an adjusting screw 64 by means of which the shaft 28 for timing its operation so that the in feed and ejection of the ‘work pieces will be in position of the entire assembly may be adjusted. A rocking yoke 65 is mounted on a pivot pin 66 in the hollow bracket 59. One extremity of the synchronism with the movements of the rockerv yoke 65 is positioned opposite the ejection plunger 23 of the grinding machine. The other extremity thereof is forked to receive the ejector arm 30. The present invention employs a valve cam 33 mounted on the cam shaft 28. A two-way value housing 34 is mounted in a valve bracket 35 se rod 68 so as to act against a set collar 61 thereon. cured to the base plate 24 opposite and below This enables the operator to use the conventional the cam 33. The vvalve housing contains a valve 15 ejector mechanism when desired, without inter plug 36 having a stem 31 projecting from the ference with the automatic ejector mechanism. It is believed that the operation of the device _ housing 34. The stem terminates in a valve operating lever 38 carrying a roller 39 in the path of ' can be understood from the above. ‘Briefly, the magazine 53 is ?lled with rough work pieces such the cam 33. Thus, as the cam rotates in a coun Fig. '7, it will contact ' as artillery shells, and the motors driving the the roller 39 causing the lever 38 to rotate the 20 grinding and feed wheels I l and I2 and the oper ter-clockwise direction in valve plug 36 90°. When the 08111;"33 leaves the > ‘ roller 39 a spring 40 will'return the lever 88 to its former position. ating motor 25 are started. . Compressed air from any suitable source is sup plied to the valve housing 34 through a com l2 against the work-piece so that the desired amount of material will be removed by the grind ing wheel 43, respectively. 'The housing is valso provided tionaltwo-way type, that is,'when the plug is ||. . ' The cam 29 will now reverse the sleeve to with! draw the feed wheel l2 and simultaneously the 30 cam 33 will contact the roller 39 so as to rotate rotated in one direction it will connect the feed 7 , ' act on the feedsleeve IE to bring the feed wheel pressed air pipe 4| and flows from and to the housing through a feed pipe 42 and a return pipe with exhaust ports 44. The valve is a conven Let us now assume that one of the work-pieces is resting on the work rest 20. The rotation of the cam 29 will pipe 42 with the compressed air pipe 4| and the of the exhaust ports 44. return 'pipe 43 to one When the plug is rotated in the other direction it 35 will connect the return pipe 43 with the com pressed air pipe 4| and the feed pipe 42 with one of the exhaust ports 44. The feed pipe 42 is con the valve plug 36 to admit air under pressure from the pipe 4| to the outer extremities of the two cylinders 45 and 46. 'It will also simultane ously connect the inner extremities of these cylin ders with the exhaust ports 44. This causes the ejector head to force the ?n ished work-piece from the rest 20 and also causes the pusher block to force the lowermost rough work-piece from the pile in the magazine 53 to’ . nected with the outer extremities of an infeed cylinder 45 and an ejection cylinder 46 through the medium of ?exible hoses 41, and the return pipe 43 is connected with the inner extremity of these two cylinders by means of similar hoses 48. The infeed cylinder 45 is supported ‘in an .in verted channel arm 49 which in turn is supported from the work rest holder 2| in a suitable bracket 50. The bracket 50 also supports a ‘slide track bar 5| (see Fig. 5), along which, a pusher block ~10 a‘ position between the wheels H and I2. The ejector head 6| temporarily supports the latter work piece and the pusher block 52 temporarily supports the pile of rough work pieces in the mag “ azine 53. The cam 33 now releases the roller 39 allow ing the spring 40 to return the valve plug 36 to its former position so as to connect the inner ex ‘ - 52 travels, and a work piece magazine 53 contain tremities‘of the cylinders 45 and 46 with the ing a vertical pile of unfinished work pieces 54. 50 compressed air pipe 4| and the outer extremities The pusher block is designed to-push the lower with the exhaust ports 44 so that both the pusher most work piece 54 from the pile inwardly along block‘ 52 and the ejector head will be snapped a projecting floor member 55 until it falls by outwardly. The cam 29 now brings the feed wheel l2 against the newly inserted work-piece. gravity to the work rest 20. The cylinders 45 and 46 are standard actuat . While a specific form of the improvement has ing cylinders which may be purchased on the been described and illustrated herein, it is de open market and contain a suitable piston (not shown) for actuating a projecting piston rod 56. sired to be understood that the same may be varied, within the. scope of the appended claims, ‘without departing from the spirit of the inven The piston rod 56 of the infeed cylinder 46 is connected to the pusher ‘block 52 to reciprocate the latter inwardly and outwardly. An adjusting screw 51 is connected to the outer extremity-of tion. I the cylinder 46 by means of which the position of the cylinder 46 may be adjusted to properly position the pusher block 52. ,ing 59 and terminates in an ejection head 6| po- ' the work rest onto a receiving chute 62 which carries it from the‘ machine. ‘ The piston rod 56.0f the cylinder 46 is adjusta bly connected to the ejector rod 60 through the ‘ ~ ' type having a grinding wheel, a feed wheel and The ejection cylinder 46 is mounted in a second inverted channel arm 58 which is supported from a hollow bracket casting 59 attached to the side of the work rest holder 2!. An ejector rod 68 ex tends longitudinally of the arm 58 and the cast sitioned to force the completed workpiece 54 from ’ Having thus described the invention, what is claimed and desired secured by Letters Patent is: l. A work-piece feeding and ejecting attach ment for centerless grinding machines, of the a work rest positioned between said wheels com prising: a horizontal in-ieed guide member ex tending into the space between said wheels above said Work rest; a magazine supporting a vertical ,pile of work-pieces on said guide member; a pusher block positioned to push the lowermost work-piece from said pile and from said guide member/so that it may fall by gravity to said work rest; a pneumatic cylinder; 9. piston in said cyl 75 inder; a piston rod extending from said piston to 2,412,730 5 an operative connection with said pusher block to actuate the latter; a two-way valve for alter nately connecting the opposite ends of said cylin der with a source of ?uid pressure; a motor op erated device for moving said feed ‘wheel toward and away from said ‘grinding wheel; means 'for operating said valve from said latter‘ device so that the movements of said valve will be in syn- ' block to actuate the latter; a two-way valve for ‘ alternately connecting the opposite ends of said cylinder with asource of ?uid pressure; a cam shaft; a motor rotating said cam shaft; a ?rst cam in said shaft; meansoperable by said ?rst I cam for-‘moving saidifeed. wheel toward and ‘ away from said grinding wheel; a second cam on said cam shaft; and means for actuatingvsaid valve'fromsaid second cam so that the changes an ejector rod positioned on the opposite side 10 ‘ in ?ow of said ?uid pressure will be in synchro of the work rest from said pusher block in‘ align- ‘ nism with the movements of said feed wheel. ‘ ment with a work-piece‘resting on said‘ rest; a ~ 3. ,Awork-piec'e feeding and ejecting attach second pneumatic cylinder,- a second piston; a chronism with the movements of said feed wheel; ment for, o‘e‘nterless grinding machines, or the second piston rod connecting said second piston vtype having a grinding wheel, a feed wheel and'a with said ejector rod for actuating the latter; and lo work rest positioned between said wheels. com pneumatic conduits connecting said second cyl-l inder with said valve so that the‘ latter will con trol the ejection of the ?nished work pieces from said work rest. ‘ ' prising: pneumatically operated‘ feeding means for placing a work piece on said work rest; a mo tor operated device for moving said feed wheel toward and away from said grinding wheel; a 2. A work-piece feeding and ejecting attach 20 valve controlling said pneumatically. operated ment for centerless grinding machines, of the means; means for operating said valve from said type having a grinding wheel, a feed wheel and motor operated device so that the movements of a work rest positioned between said wheels, com said valve will be synchronized with the move prising: a horizontal in-i‘eed guide member ex of said feed wheel; a pneumatically oper tending into the space between said wheels above 25" ments ated ejecting means positioned on the opposite said work rest; a magazine supporting a vertical of vthe work rest from the pneumatically op pile of work-pieces on said guide member; a‘, side erated feeding means and in alignment with a pusher block positioned to push the lowermost work-piece resting on said rest; and pneumatic work-piece from said pile and from said guide conduits connecting said pneumatically operated member so that it may fall by gravity to said 30 ejecting means with said valve so that the lat work rest; a pneumatic cylinder; a piston in said ter will control the ejection of the finished work cylinder; a piston rod extending from said pis pieces from said work rest. ‘ ton toan operative connection with said pusher JOHN E. HECKETHORN.