US2243405A - Feeding mechanism - Google Patents

Description

May 27, 1941; lN' 2,243,405

FEEDING MECHANISM Filed Nov. 17, 1935 2 Sheets-Sheet} Zinnentor EoeAR F! WINE (Ittorneg May 27, 1941. E. P. WINE 2,243,405

FEEDING MECHANISM Filed Nov. 17, 1938 2 Sheets-Sheet 2 I 3n ne ntor E 8 EDGAR F! WIN;

(Ittorneg Patented May 27, 1941 UNITED STATES PATENT OFFICE FEEDING MECHANISM Edgar P. Wine, Waynesboro, Pa., assignor to Landis Tool Company, Waynesboro, Pa.

Application November 17, 1938, Serial No. 241,072

4 Claims.

My invention relates to feed mechanisms for machine tools and particularly for grinding machines.

It is an object of my invention to provide a power operated feed mechanism capable of rapid positioning and slow feeding movements.

A further object is to provide manual means for adjusting the zone of operation of said power operated mechanism.

A further object is to provide a sliding rack which will move with the wheel base during the positioning and grinding movement and which will remain fixed relative to the bed during the adjusting movement.

Heretofore, wheel bases having a hydraulically operated rapid positioning movement required an intermediate slide between the wheel base and the bed. To this slide was attached a power device such as a piston and cylinder for moving the wheel base and slide bodily to place the grinding wheel close to the work. During the succeeding grinding operation the rapid movement would be retarded by a dash pot mechanism or by a throttle valve in the supply or exhaust system. The means for adjusting the zone of operation consisted of a rack or the like on the slide meshing with suitable gearing such as a pinion driven thru reduction gears by a handwheel.

The present invention has for its object to do away with the intermediate slide and to substitute therefor a rack slidably mounted on the bed and operably connected to a power drive means such as a piston and cylinder. Said rack is operably connected to the wheel base thru a vertical pinion shaft with the pinion on the lower end of the shaft and in mesh with the rack. The vertical shaft may be driven thru suitable gearing by a handwheel.

In the drawings:

Figure 1 is a partial end elevation partly in section of the wheel support and feed mechanism of a grinding machine.

Figure 2 is a plan view of the feed mechanism.

Numeral l indicates the bed of a grinding machine. A wheel support II is slidably mounted on guide ways 12 and IS in said bed. The corresponding guides on the wheel support are indicated by the numerals l2a and l3a'. A grinding wheel I4 is rotatably mounted on said wheel support. Said wheel is driven thru belts l5 by a motor l6 mounted on said wheel support II.

A cylinder 20 is mounted in the upper portion of said bed and has a piston 2| slidably mounted therein. A piston rod 22 carries a bracket 23 which in turn is attached to a rack member 24.

Said rack is slidably supported in lugs 25 and 26 in said bed. Fluid under pressure is supplied to said cylinder 20 from a pump 50 thru a valve 5| which directs said fluid to one side or the other of said cylinder.

Movement of said piston and rack is controlled by a dash pot consisting of a cylinder 30, a piston 3| slidably mounted therein and a piston rod 32 protruding from said cylinder in the path of piston rod 22 and bracket 23. Piston 3| is moved to and held in its right hand position by a spring 33. A fluid reservoir 34 above said cylinder is connectedthereto by a divided passage having a single port in cylinder 30. One part of said passage contains an adjustable throttle valve 35, the other part contains a ball check valve 36 which permits a flow of fluid only from the reservoir 34 to the cylinder 30.

The teeth 21 of rack 24 engage a pinion 40 on the lower end of a vertical shaft 41 in wheel base II. On the upper end of said shaftis a worm wheel 42. A worm (not shown) which meshes with said Worm wheel is mounted on one end of a horizontal shaft 43, at the other end of which is a handwheel 44.

Operation Movement of the grinding wheel l4 toward and from the work piece may be effected by piston 2| in response to introduction of fluid under pressure from any suitable source into either end of cylinder 20. Said piston moves at a rapid rate until the piston rod 22 engages the piston rod 32 of the dash pot. Movement of said piston causes a similar movement of rack 24. The teeth on said rack exert a rotating force on pinion 40 but shaft 4| is locked against rotation from this source and the result is that the entire wheel support is moved. forward. This movement is effected at a rapid rate until the wheel is almost in contact with the work. At this point piston rod 22 engages rod 32 of the dash pot and fluid in cylinder 30 is directed back to reservoir 34 at a rate determined by the setting of needle valve 35.

The zone of movement of said wheel support by said piston 2| may be adjusted by rotating hand wheel 44 which thru shaft 43, worm wheel 42 and shaft 4! rotates pinion 48. Rack 24 is locked against movement by the fluid in the cylinder 20 and therefore the rotation of pinion 49 causes said pinion along with the wheel base H to move relatively to said rack.

I claim:

1. A feeding mechanism for a grinding wheel including a base, a wheel support slidably mounted on said base, a grinding wheel rotatably mounted on said support, means for effecting movement of said support toward and from a work piece including a rack member slidably mounted in said base, connections between said rack and said wheel support, a power mechanism and direct connection between said rack and said power mechanism.

2. A feeding mechanism for a grinding wheel including a base, a wheel support slidably mounted thereon, a grinding wheel rotatably mounted on said support, means for effecting movement of said support toward and from a work piece including a rack, means on said base for supporting and guiding said rack, a manually operated said rack and for moving said? support relative to said rack, and a power: operated mechanism directly connected to said rack, for moving said rack and said wheel support bodily.

3,. A feeding mechanism for a grinding wheel including a base, guideways irrsaid base, awheel support having guide surfaces resting on said guide ways, a grinding wheel rotatably mounted in said support, means for moving said support toward and from a work piece including a rack slidably mounted in said base, a gear meshing with said rack, a shaft supporting said gear, a handwheel for rotating said shaft, and power means directly connected to said rack.

4. A feeding mechanism for a grinding wheel including a base, guideways in said base, a wheel support having guide surfaces resting on said guide ways, a grinding wheel rotatably mounted in said support, means for moving said support I toward and from a Work piece including a rack feed mechanism including a pinion for engaging slidably mounted in said base, a gear meshing with said rack, a shaft supporting said gear, a

handwheel'for rotating said shaft, and power means directly connected to said rack for shifting same, said gear, shaft and handwheel assembly being mounted on said Wheel support.

EDGAR P. WINE.

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