US2814919A - Work feeding mechanism - Google Patents

Description

Dec. 3, 1957 A. J. JoNr-:s TAL woRx FEEDING MECHANISM' Filed March 14, 1955 4 sheets-sheet 1 S T Y Elf E Tun N mwh Vi? N A n lmN A VH L0 AJ Y/ m B De@ 3, 1957 A. J. JONES ETAL 2,814,919

y l WORK FEED'ING MECHANISM Filed March 14, 1955 4 Sheets-Sheet 2 lNvEN'roRs AL VIN J. .l0/VES BY JHN H. LER )7 ATTORNEY Dec. s, 1957 A. J. JONES ETAL 2,814,919 WORK FEEDING MECHANISM 4 Sheets-Sheet 5 Filed March 14, 1955 /0 -I INVENTORS Dec 3, 1957 1A. J. JoNEs ETA| 2,814,919

VWORK FEEDING MECHANISM l Filed March 14, 1955. 4.sheetssneet 4 INVENTOR 5 ALVIN J. JNES ATroRNEY United States Patent WORKY FEEDING MECHANISM Alvin J. Jones, Waynesboro, Pa., and John A. Boller, Thurmont, Md., assignors to Landis Tool Company, Waynesboro, Pa.

Application March 14, 1955, Serial No. 494,098

3 Claims. (Cl. 51-215) This invention relates to centerless grinders, particularly to means for introducing work pieces having a head or shoulder portion.

It is an object of this invention to provide an automatic feeding means whereby a work piece is placed in predetermined position relative to the grinding throat and then shifted to the grinding throat.

In the drawings:

Figure 1 is an end elevation showing a magazine in position to place a work piece in the machine.

Figure 2 is the same View with an injector device shifting the work piece from the magazineto the machine.

Figure 3 is the same view with the magazine and injector Withdrawn to inoperative position so that a finished work piece may be ejected.

Figure 4 is a partial sectional plan view of the mounting of the chute and injector.

Figure 5 is a hydraulic and electric diagram.

Numeral indicates the bed of a grinding machine, numeral 11 a grinding wheel rotatably mounted thereon, numeral 12 a work support, all of which are disclosed more in detail in Patent 2,419,940 granted May 6, 1947. The workpiece 13 consists of two cylindrical elements joined to form a T. The stem of the T is the portion to be ground.' The cross member of the T is used to hold the workpiece in the chute. The means for supplying work pieces to the machine consists of a bracket having one end of a shaft 21 secured therein by clamp screws 22. The protruding portion of said shaft has a bushing 23 rotatably mounted thereon and has a work magazine 24 in the form of a chute clamped to said bushing by a clamplng screw 25.

Aninjector member 30 having a work engaging portion 31 is rotatably mounted on bearings 26 which in turn are supported on bushing 23 between magazine 24 and bracket 20 on shaft 21. A spring 32 has one end connected to magazine 24 and the other end to injector member 3i). The upper end of injector member 30 has a link portion 35 to which is attached a link 36. Said link is in turn attached to link member 37 on piston rod 38. Said piston rod is attached to piston 39 which is slidably mounted in a cylinder 40. To one side of cylinder 40 is a second cylindrical portion 41 in which is slidably mounted a plunger 42. Said plunger is held in right hand position by a spring (not shown). An arm 43 on said plunger extends into the path of link member 37 so that when piston 39 moves to the left it shifts plunger 42 to actuate a limit switch 153. The function of the limit switch will be described later. On the back of magalzine 24 is an abutment 27 having adjusting screw 28 thereon for engaging and actuating switch LS158 as shown in Figure 3. The function of switch LS158 will also be described later.

In the position of the parts shown in Figure 1, piston 39 is moved partway to the left and through its connection to injector member has rotated said member in a Counter-clockwise direction. Said injector member,

ice

i2` through' spring 32,-' hasrotated`y magazine 24 into a position such that' the lower portion thereof has placed one of the work piecesA 113 in'alignment with the work support lf2. Thismovementof magazine 24 is limited by engagementofl stop member 601 thereon with the side of work support 12.

In Figure 2 piston 39?-i's'shown` at the end of its movementy to the left in which the injector member has continued its counter-clockwise*movement after the magazine 24l has stopped so that the work engaging portion 31 of said member passes through an opening 19 in the lower portion of said magazine to shift a work piece 13 out of the grip of resilient retaining member 18 and into operative relation to grinding wheel 111. This movement of the work piece 13 is limited by'an ejector rod 65 which serves as a locating means for the work piece 13. Ejector 65 may be actuatedin a manner similar to that disclosed in Patent 2,571,610, granted October 16, 1951, or Patent 2,603,916,` granted July 22, 1952.

In Figure 3, movement-of piston 39 has been reversed andinjector member 30 is moved in a clockwise direction withdrawing'the work engaging portion 31 and thereby 'permitting the droppingv of another work piece into the opening 19. Thereafter the continued Imovement of piston 39 andmemberl 3'0lca'uses *the magazine-also to move in a clockwise direction away fromvthe point of operation so 'that after the work piece has been ground it may be ejected vinto a discharge chute 70;

Operation Pushing `start'button f 100` rcompletes 'a circuit to energize CRS. In the retracted position of wheel 11, the wheel support. (not shown) engages and holds LS161 in closed position,` and with contact lof CRS completes a circuit -tracted position.

CR energizes'valve solenoid 157 shifting the valve to the left and directing fluid under pressure to the left endfoffejector cylinder u to actuate ejector rod 65 and remove a finished workpiece from themachine. Details of the structure and operation of this ejector may be found in Patents 2,571,610 and 2,603,916 referred to above. Operation of the ejector serves` to close LS152 whichcompletesa circuit through normally closed LS153 to energize CR7. LS152 also completes a circuit through normally closed contact 1 of CR11- to energize CRS. CR7 closes a circuit toholditself and also to lay-passl LS152 to hold CRS after LS152 opens.

CRS energizes valve solenoid 151 shifting the piston 39 to the left and shifting injector 30 and magazine 24 in a counter-clockwise direction to place a work piece 13 in the position shown in Figure 2. During this movement of piston 39, said link member 37 engages arm 43 on plunger 42 shifting said plunger to the left to open LS153. At the same time normally closed LS158 is released by screw 28 on magazine 24 to close a circuit through contact 2 of TRM to energize CR10. Contact 1 of CR10 closes providing a holding circuit through said contact 2 of TRM.

Normally closed LS153 is thus opened by plunger 42 to break the circuit to CR7 which in turn will de-energize CRS and valve solenoid 151, permitting said valve to be shifted to the right in which position uid will be directed to the left end of cylinder 4i) to shift piston 39 to the right. This movement of piston 39 will cause magazine 24 and injector member 30 to move in a clockwise direction to inoperative position. In this position LS158 will be opened and the other contact will be closed completing a circuit from contact 1 0f CR10 to energize CR11,

Contacts 2 and 3 of CR11 close to energize valve solenoid 155 shifting the valve to the left and directing uid under pressure to the left Vend of reversing valve 120, shifting said valve to the right in which position uid under pressure is directed to the right hand end of feed cylinder 130 shifting piston 131 and grinding wheel 11 to operative position. At a predetermined point in the movement of said feed mechanism, LS154 will be closed energizing the timer clutch and closing contact 1 of TRM to start the timing motor. When the timer times out contact 2 will open de-energizng CR10 and opening contact 1 of TRM to break the circuit to CR11. De-energizing CR11 will close contact 1 and open contacts 2 and 3. Opening contacts 2 and 3 will de-energize valve solenoid 155 shifting the valve to the right and directing fluid to the right side of reversing valve 120. Reversing valve 120 will then shift to the left directing fluid to the left hand end of feed cylinder 130 and shifting piston 131 to the right to withdraw wheel 11 from grinding position. Upon withdrawal of the wheel 11, LS161 is actuated and completes a circuit through contact 1 of CRS to energize CR6 and ejector valve solenoid 157.

Normally closed contact 1 of CR11 energizes CRS which in turn energizes valve solenoid 151 shifting the valve to the left and directing iluid under pressure to the right end of loader cylinder 40 actuating piston 39 to move the magazine 24 and injector member 30 on shaft 21 to place a Work piece 13 in the machine. LS153 opened by this movement of loader piston 39 de-energizes C117 which in turn de-energizes CRS and valve solenoid 151 to reverse the ow of uid to cylinder 40 and Withdraw magazine 24 and injector member 30 to inoperative position.

When CR6 is de-energized valve solenoid 157 is also dta-energized and the valve shifted to the right. In this position of the valve, uid under pressure is directed to the right end of ejector valve 110 to actuate the ejector as described in Patents 2,571,610 and 2,603,916. As described above the ejector actuates LS152 to start a new cycle.

We claim:

1. In a machine tool, means for supporting the work pieces in position for performing a machining operation thereon, means for placing a Work piece in said position comprising a magazine through which work pieces are adapted to move by gravity, means for placing said magazine in operative relation to the point of operation in said machine tool including a shaft on which said magazine is rotatably mounted, a second member on said shaft and having a resilient connection with said magazine, said second member having means for shifting a work piece from ysaid magazine into said machine tool, means for applying a rotating force to said second member and through said -resilient means to said magazine whereby said magazine is moved into operative position, a positive stop for locating said magazine, said rotating force continuing the movement of said second member after said magazine has stopped, to shift a work piece out of the magazine and into the machine, said resilient means being operable when said rotating means is moved in the o'pposite direction for withdrawing said second member to permit a new Work piece to drop into loading position and thereafter to remove said magazine from operative position, and an ejector and means operable after said magazine has been withdrawn for actuating said ejector to remove a finished workpiece from the machine.

, 2. A loading device for a machine tool comprising a magazine rotatably mounted thereon through which workpieces are adapted to be introduced into the machine, a transfer member mounted for rotation with, but independent of said magazine, resilient means for holding said member yieldingly in predetermined relation to said magazine, means for moving said magazine and transfer member to place a work piece in position to be loaded, means for stopping said magazine in said position, said resilient means permitting continued movement of said transfer member to transfer said Work piece from said magazine to the machine.

, 3. A loading device for a machine tool comprising a magazine rotatably mounted thereon from which Workpi-eces are adapted to be positioned adjacent the operative position in said machine, an injector member mounted for rotation independently of said magazine, means Afor moving said injector member toward said operative position, a resilient connection between said magazine and said member whereby movement of said member causes movement of said magazine, a positive stop for determining the extent of movement of said magazine while said injector member continues to move relatively thereto to remove a work piece from said magazine and insert it in operative position in the machine.

References Cited in the le of this patent UNTTED STATES PATENTS 545,468 Field Sept. 3, 1895 1,319,921 Bock Oct. 28, 1919 1,481,064 Ochs Jan. 15, 1924 1,718,240 Kinney June 25, 1929 1,768,629 Radbruch July 1, 1930 2,086,052 Silven July 6, 1937 2,597,912 Troll May 27, 1952 2,610,448 Mader Sept. 16, 1952 2,678,521 Flohr May 18, 1954 FOREIGN PATENTS 735,930 France Sept. 6, 1932

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