US1113914A

US1113914A - Grinding-machine.

Info

Publication number: US1113914A
Application number: US76236013A
Authority: US
Inventors: Harry T Shearer
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-04-19
Filing date: 1913-04-19
Publication date: 1914-10-13
Anticipated expiration: 1931-10-13

Description

H. T. SHEARER.

GRINDING MACHINE.

APPLICATION FILED APR.19, 191s.

1, 1 1 3,914, f .Patented 001.1311914.

2 SHEETS-SHEET l.

H. T. SHEARER.

' GRINDING MACHINE.

APPLICATION FILED APR. 19, 1913.

11,113,914. l Patented Oct. 13,1914.

2 SHEETS-SHEET 2.

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HARRY T. SHEAEEE, or wAYNEsBoRo, PENNSYLVANIA.

. @BINDING-MACHINE.

To all 'whom it may concern: y Be it known that I, HARRY T. SHEARER, a

'citizen of the United States, residing at Waynesboro, Franklin county, and State of Pennsylvania, have invented and discovered certain new and useful Improvements in Grinding-Machines, of which the followlng.

is a specification. A

My said invention consists in an improved construction and arrangement of parts of automatic cross feed mechanism for the grinding wheels of grinding` machines,

whereby such a mechanism is provided which is positive in its action and which operates during the period of the tarry of the .grinding wheel carriage at each reversing point, all as will be hereinafter more fully described'and claimed.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate .simiv lar parts, Figure 1 is a rear view of a portion of a grinding machine yof the Landis type illustrating the portions of the mechanism to which my said invention relates;

Fig. 2 a detail elevation of the parts as seen when looking in the direction indicated by the arrows from the dotted line 2-2 in Fig. 1; Fig. 3 a detail plan view of the gearing separate fromthe framework, show' g its relative arrangement, one part to another; and, Fig. 4 a detail view on the dotted line 4-4 in Fig. 3. 1

In said drawings the portions marked A represent the grinding wheel carriage; B the grinding wheel base; and C the transverse slide on top of the carriage on which said base is adapted to move to feed the grind`l ing wheel to and from the work. All of" these parts are substantially of the wellknown Landis type and their construction and arrangement being well understood need not be further explained except incidentally in describing the invention. l

rlhe mechanism for feeding the rinding wheel to the work comprises a rac 10, secured to the slide C with which a pinion `11 on the lower'end of a vertical shaft 12 is adapted to engage. Said shaft 12 is-journaled in grinding wheel base B and has a worm gear 13 on its upper end with which a worin 14 on the end oa horizontal shaft 15 engages. Said shaft 15 is supported in appropriate bearings on the carriage and carries a ratchet feed wheel 16 on its outer end adapted to be operated by apawl 17 ISpecication of Letters Patent. y

Application med April 19, i913. serialNo..7z3eo;-. r

connected vwith `a reciprocating member 18 throughthe medium of angle lever 19 pivyoted. at 20 andconnected withfsaid reciproeating member by pivot 21. Said angle 1ever 19 has a segment gear 22 on its upper end adapted to engage with a similar gear 23` on the lower end of an angle arm 24 pivoted at 25 and carrying said pawl 17 on its outer end. Said vreciprocating member 18 is in the form of a weight and at its lower end rests on arm 70 on one side of 'a housing 26 carried on the upper end of the plunatentd 0615.13, 1914.

ger 27.` Said plunger is mounted in a suitable hollow standard 28 carried by the grinding wheel carriage. l

A 'rack bar 29 is mounted to have a limited sliding movement on the under side of the grinding wheel carriage and a rod 30 is connected therewith by a slot 34 and pin 35. Said bar extends between a fixed roller 31 mounted in the lower end of standard 28 and another roller 32 Imounted on a horiplunger 27; A diamond-shaped cam 33 is formedor mounted on said rod 30 adjacent to said

rollers

31 and 32. The slot and pin connection with said slidingrack 29 permits l a limited independent movement. of said rod for a purpose to be presently described. Another rack bar 36 is fixed on the grinding wheel carriage A with which a pinion 37 on lahorizontal transverse shaft 38 is adapted end which meshes with theteeth of rack 29.

A drivingshaft'45 geared to the main drivj ing mechanism (not shown) has -a bevel gear wheel 46 meshin o n .shaft 38 an, is provided with a driving'clutch part 47'adapted to beshifted by with bevel gear wheel 40 Azontal pivot carried by the lower end of g mechanism, comprising a wheel 50 carrying injthis type of machine.

l .ent invention is as follows: The machine being in operation and the parts being in the position illustrated in Fig. l, the carriage is about to reverse and start to travel in the direction indicated by the large arrow at `the top in said figure. The power is transmitted, as above described, from the driving shaft 45 through the gears 46 and 40 to the' shaft 43 which, through the rack 29, operates the carriage back and forth. As the carriage reaches the limit of its movement in one direction and the clutch part 47 is thrown, through the mechanism before described, from one driving gear to the other. The first movement of the gear will operate through the connections above mentioned to slide rack 29 in the direction indicated by the small arrow on the underfside in Fig. 1, and to draw cam 33 from the outside contact with

rollers

31 and 32 between said rollers. As said cam rides up over the lower roller 3l, it elevates plunger 27, reciprocating member 18 and the connected parts, and operates shaft 12 and, through its connection with the rack 10, feeds carriage, B forward, carrying the grinding wheel one step -into the Work. i The movement of said rack before its contact with shoulder 56 is just suiiicient to bring the-apex of the diamondshaped cam over the center line of

rollers

31 and 32, whereupon the weight iof reciprocating part 18, and other parts carried by the plunger 27, serves to slide said rod independently and carry the other end of its slot 34 against pin 35. The end of rack-bar 29 being then against shoulder 56, `the carriageA will start to move. This'operation insures the positivev and accurate feed of the grinding wheel to the work` and While the carriage is standing at a tarry so that the extreme ends of the Work receive the same amount of grinding and are reduced to the same degree as thevother partsl of the work being operated upon. The operation is the same at the opposite end of the work, the parts being fset for-the feeding operation bythe appropriate end of slot 34 being ,in contact with pin 35, and continues in this manner until the work is reduced to av predetermined size,f-faut omatically regulated by mechanism common to this type of machine and not shown or described herein.

Rack 36 operates through shaft 38 to turn wheel 50 carrying dogs 51 and 52 set to operate the reversing mechanism at the desired points. Hand wheel 39 may be used to traverse the carriage A by hand, as for setting, adjustment, etc.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent is:

1. An automatic cross feed for the grinding wheel of grinding machines comprising a reciprocating rack-bar mounted on the grinding wheel carriage and adapted to move independently thereof for a limited distance, feed mechanism connected with the grinding wheel base, a reciprocating plunger for operating said mechanism, and a, cam connected with said rack-bar to have aV limited independent movement and mounted to operate said plunger, substantially as set forth.

2. An automatic feed mechanism for the grinding wheel of grinding machines comprising a wheel base, the grinding wheel carriage on which the wheel base is mounted, a rack-bar carried on said grinding wheel carriage and mounted to have a limited independent movement, gearing connected with said rack-bar for operating the carriage, reversing mechanism, gearing for feeding said wheel base forward step by step, a vertically reciprocating plunger connected to operate said feeding mechanism, and a cam mounted to operate said reciprocating plunger and connected with said rack-bar to have a limited independent movement, substantially as set forth.

3. In a grinding machine the combination of a grinding vwheel carriage, a grinding wheel base mounted to slide transversely on Said carriage, mechanism for feeding said grinding wheel base toward and from the Work step by step, a reciprocating plunger mounted on said grinding wheel carriage for operating said mechanism, a cam for operating said plunger, a rack-bar mounted :on said grinding wheel carriage to have a limited independent movement, a connection between said rack-bar and said cam adapted to permit a limited independent movement between said parts, and gearing connecting said rack-bar with the driving mechanism, substantially as set forth.

4. In a grinding machine the combination of a grinding wheel carriage, mechanism for traversing said carriage, a grinding wheel base mounted to slide transversely on said carriage, mechanism for sliding said wheel base step by step, a reciprocating 'plunger for operating said mechanism, and a .cam for operating said plunger connected to said grinding wheel carriage, substantially as set forth.

5. In a grindin machine the combination of a grinding w eel carriage, a grinding fao wheel base mountedto slide transversely thereon, mechanism for sliding said grind-- ing wheel base step by step, a reciprocating plunger for operating said mechanism, a cam for reciprocating said plunger, a rackbar on said carriage connected with said cam, and traversing and reversing mechanism geared to said rack-bar, substantially as set forth.

6. In a grinding machine the combination of a grinding Wheel carriage, a grinding wheel base mounted to slide transversely on said carriage, means for traversing said carriage back and forth, comprising a rack mechanism for sliding said grinding Wheel base across said carriage, and a cam connected to said rack and arranged to be operated by the traverse of the carriage for oper ating the mechanism for sliding said Wheel base, substantially as set forth.

7. A grinding machine comprising a grinding Wheel carriage, means for traversing said carriage, a grinding Wheel base mounted to slide across said carriage, mechanism for feeding said grinding Wheel base step by step, and a cam for operating said mechanism connected to said grinding wheel carriage to have a limited independent movement whereby the feed of the grinding Wheel to the work is accomplished during the tarry ,of the carriage at each reverse thereof, substantially as set forth.

8. A grinding machine comprising a grinding wheel carriage, a grinding Wheel base .mounted to slide across said carriage, means for operating said base to feed the grinding wheel step by step to the Work, a reciprocating part for operating said mechanism, a cam for operating said reciprocating part, a rack-bar mounted on the grinding Wheel carriage to slide independently thereof for a limited distance, a connection between said rack-bar and said cam to permit a limited independent movement, driving mechanism, and gearing connecting said driving mechanism With'said rack-bar, substantially as set forth.

9. A grinding' machine comprising a grinding Wheel carriage, a grinding Wheel base mounted to slide across said carriage, mechanism for feeding said grinding vvheel` base step by step to the Work, an operative connection between said mechanism and the grinding Wheel carriage embodying a rackbar having a limited independent movement, gearing connecting said rack-bar With-the driving mechanism, said driving mechanism embodying a reversing gear, means for operating said reversing gear, a second rackbar fixed upon said grinding wheel carriage, and a connection between said rack-bar and the means for operating said reversing gear, substantially as set forth.

In Witness whereof, I have hereunto set my hand and seal at Waynesboro, Pennsylvania, this'Qlst day of March, A. D. nineteen hundred and thirteen.

HARRY T. SHEARER.

lVit-nesses:

K. H. WASHABAUGH, C. F. KooNs.