US1912491A - Buffing machine - Google Patents

Description

W. T. MlNETT BUFFING MACHINE June 6, 1933.

2 Sheets-Sheetl Filed Jan. l2, 19294 /A/ VEN m5'.- l

W. T. MINETT BUFFING MACHINE June 6, 1933.

Filed Jan. l2, 1929 2 Sheets-Sheet 2 Patented June 6, 1933 UNITED STATES 4PATENT 'OFFICE WILFRID THOMAS MINETT, OF LEICESTER, ENGLAN'D, ASSIGNOR T0 'UNITED SHOE MACHINERY CORPORATION, OF PATTERSON, NEW JERSEY, A. CORPORATION OF NEW JERSEY BUFFING- MACHINE Application led January 12, 1929, Serial No. 332,164, and in Great Britain January 17, 1928.

This invention relates to buffing or scouring machines and is herein illustrated as embodied in a machine, for buifing or scouring shoe bottoms, of the type shown in United States Letters Patent No. 1,157,725, granted October 26, 1915 upon the application of William A. Reed and James Foley, wherein the abrading action is effected by means of a cylindrical roll Which is rotated and is also reciprocated axially.

It has been found, particularly in treating shoe bottoms, that a superior finish is imparted to the surface of the Work and that the life of the abrasive covering of the roll is prolonged if a longitudinal reciprocation is imparted to the roll as it is rotated so that there is no opportunity either for the Work to contact 'with the same circumferential portion of the roll for any great length of time or for any particle of abrasive of undue size' to make a scratch upon the Work. Accordingly, machines of this type have been arranged so that the shaft carrying the buffing rolls is given an axial reciprocation at a relatively sloW speed While the shaft is rotated at high speed (for example, from three to four thousand revolutions per minute). Inasmuch as the shaft carrying such rolls must be of substantial size andiweight, it will be evident that unless adequate lubrication is provided, wear will rapidly ensue and that such Wear will be accompanied not only by noise but also by vibration which will be detrimental to the production'of a good quality of Work.

One of the objects of the present invention is to provide an improved machine having a mechanism for reciprocating the shaft which mechanism, by reason of its compactness, may

be enclosed in a housing which contains lubricant.

To this end and in accordance With one feature of the invention, the illustrated machine is provided with a collar carried upon a shaft carrying a bufiing roll, the collar having an annular guidevvay, such as a slot, disposed in a plane inclined to the axis of the shaft, a gimbal ring surrounding the collar, means engaging the guideway and connected t0 said gimbal ring for reacting upon said collar to the collar to the shaft.l In the illustratedv machine, the gimbal ring is mounted upon trunnions having an axis which intersects the axis of the shaft, and the guideWay-engaging means is connected to the gimbal ring by trunnions having an axis offset from the axis of the shaft. The collar and the means cooperating therewith may be compactly arranged Within a housing containing lubricant.

In accordance With another feature of the invention improved means actuated by the shaft are provided for supplying lubricant to the mechanism which reciprocates the shaft axially. As illustrated, means is provided for supplying lubricant to a cylinder in which the 'shaft reciprocates, and the plunger-like action of the shaft forces the lubricant from the cylinder through a passage in the shaft itself to the engaging surfaces of the shaftvand the means for reciprocating the shaft. The above and other features of the invention, including details of construction, will now be more particularly described with reference to the accompanying drawings, in which:

Fig. 1 is a general view in perspective of a machine embodying the invention in a preferred form:

Fig. 2 is an enlarged vertical sectional view of shaft reciprocating mechanism, taken through the axis of the hui'ng roll shaft illustrated in Fig. 1; and

Fig. 3,is a transverse sectional view taken on the line III-III of Fig. 2.

The illustrated machine for treating the bottoms of shoes, shown as a whole in Fig. 1, comprises a frame 10 provided with bearings 12, 12 for a shaft 14 upon which the buffing rolls 15, 15 are mounted, the spacing of the rolls from the bearings being such that axial reciprocation of the shaft is permitted. Associated with the elongated cylindrical buffing rolls are hoods 17, 17 and dust-collecting 'a housing 22.

the final buiiing upon both the treads and the shank portions of the bottoms, the machine is also provided with pads 23, v23 of the wellknown Naumkeafr type, the pads being rotatable about uprigilit forwardly inclined axes and positioned just above the scouri rolls 15 so that they are accessible for useily the operator without-any substantial change in stance. Tlie machine is also provided with a pressure pump 25 of the type illustrated in United States Letters Patent No. 822,154 granted May 29, 1906 upon the application of A. W'. Rogers for supplying air under pressure to the Naumkeag pads 23, 23. Power for rotation of the builing tools 15, 15 is derived from a drive shaft 20 at the base of the machine which is connected to the shaft 14 by means of a belt 18 running over a pulley 16 on said shaft.

In order that the shaft 14 carrying the buffing rolls may be reciprocated during its rotation, novel mechanism is provided, which is included within and largely concealed by This housing 22 is bolted to the frame adjacent to and surrounding the left-hand end of the shaft 14. A collar 24 (Fig. 2), extending within the housing 22, is carried upon the shaft 14 and is freely rotatable with respect thereto, the collar 24 being driven by a pulley 26 keyed to the collar 24 upon a hub 27 which extends outside the housing 22. The pulley 26 is driven at a slower rate than the shaft 14 by abelt 28 from the drive shaft 20. The opposite end of the collar 24 within the housing 22 acts upon the shaft 14 through a double thrust bearing 30 carried by the collar 24 to transmit any longitudinal movements of the collar 24 to the shaft 14. The portion of the collar 24 between the thrust bearing 30 and pulley 26 is enlarged and has formed in it an annular guideway in the form of a slot 32 of square cross section, the annular slot 32 bei concentric with the axis of the shaft 14, while the plane of the slot 32 is inclined to the axis of the shaft 14. Surrounding the collar 24 is a gimbal ring 34 supported by a fixed fulcrnm in the form of diametrically opposed external horizontal trunnions 36 (Figz 3). mounted to fit freely in bearings 38 in the sides of the housing 22, the axis of the trunnions 36 being perpendicular to and intersecting the axis of the shaft 14. rihe gimbal' ring 34 is connected by a second pair of coaxially opposed trunnions 40 extending inwardly from the gimbal ring 34 to a block 42 which is in the form of a ring mounted to slide within and fitting the slot 32. The axis of the trunnions 40 is perpendicular to and intersects the axis of the trunnions 36. rlhe block 42 does not form a complete annulus butlias a gap cut in it to allow its being assembled over the collar 24, as shown in Fig.

3. The axis of the trunnions 40 (Fig. 3) is ofset from the axis of the shaft 14 so that on the rotation of the collar 24 the block riri 42 will cause the gimbal ring 34 to oscillate a out -24 would have no effect at all upon the axial position of the shaft 14. However, inas much as the axis of the trunnions 40, and therefore the fixed point of intersection of the axes of the two sets of trunnions, is oset from the axis of the shaft 14, a reaction will be set up between the trunnions of the gimbal ring 34, which trunnions are journaled in the housing 22, and the rotating collar 24. This will cause the collar 24 to reciprocate along the axis of the shaft 14, and such reciprocation of the collar 24 will be transmitted to the shaft 14 through the double thrust bearing 30, causing the shaft 14 to oscillate axially. That such must be the case will be evident when it is considered that the block ring 42 is confined to rotation about the axis of the trunnions 36 and also about the axis of the trunnions 40. The block ring 42 is thus confined to movement about the intersection of the axes of the two sets of trunnions. This intersection, being in the fixed axis of the trunnions 36, is a fixed point. The rotation of the collar 24, with its inclined guideway 32, will cause the block ring 42 to oscillate about the above-mentioned intersection of the trunnion axes as a fixed center. Since this fixed center lies outside of the axis of the collar 24, the component of oscillatory movement of the block ring 42 which is in line with the axis of the collar 24 will be transmitted to the collar 24; in other words, the collar 24 will be reciprocated along its own axis.

lnuorder to provide for lubrication of the above-described mechanism, a Well 44 is formed in the bottom of the housing 22. A chain 46 carried upon the shaft 14 adjacent to its end dips into the Well 44 and picks up oil which it delivers to a helical groove 48 formed in the shaft 14 and extending from a point adjacent to the chain 46 to the adjacent end of the shaft 14. That end of the shaft 14 is received within a cylindrical recess in a block 50, hereinafter termed a cylinder, which is mounted on the end wall of the housing 22. An axially disposed passage 52 extends through the shaft 14 from the end of the shaft 14 toward a point adjacent to the end of the hub-of the collar 24 which extends outside the housing 22. IThe passage 52 connects with a radial passage 54 which in turn connects with a second helical groove 58 in the periphery of the shaft 14 to supply lubricant to the engaging surfaces of the collar 24and of the shaft 14. The shaft 14, acting as a plunger by reason of its reciprocating movement, will force the lubricant which collects in the. cylinder 50 through the assages 52 and 54 to the groove 58. A cylim rical recess 60 is formed in the collar 24 at the point where the radial passage 54 emerges. Any excess of lubricant delivered through the passage 54 will be collected in the recess (3() from which it will return to the interior of the housing 22 through a passage (i2 in the collar 24. Air which might otherwise be trapped in the passages 52 and 5l will also escape through the recess 60 and the passage (32.

For lubricating the trunnions 36, oil holes 64 (Fig. 3) are provided in the bearings 38. A pair of downwardly sloping rods 66 (Fig. 2) are each supported at one end from the upper wall of the housing 22. The lower opposite ends of the rods 66 terminate directly above the oil holes 64. The rotation of the collar 24 will cause the oil within the housing 22 to splash and some of the oil which is thus splashed will collect upon the rods 66 and will thus be conducted to the lower ends of the rods 66 from which the oil will drop into ,the oil holes 64 to lubricate the trunnions.

Having thus described my invention, what I claim as new and desire to secure by Letter.; Patent of the United States is:

1. In an abrading machine, a shaft mounted for axial movement, means for rotating said shaft, a collar carried upon said shaft and having an annular guideway disposed in a plane inclined to the axis of said shaft, means for rotating said collar, a fixed fulcrum having an axis which intersects the axis of said shaft, a gimbal ring pivotally mounted on said fulcrum and surrounding said collar, a ring slidably engaging said guideway, pivotal connecting means between said slidable ring and said gimbal ring constructed and arranged to cause said slidable ring to react upon said collar as the latter rotates to reciprocate said collar along the axis of said shaft, and means for transmitting said reciprocatory movement of said collar to said shaft.

2. In an abrading machine, a shaft mounted for rotation and for axial movement for carrying an abrading roll, a collar carried upon said shaft and having an annular guideway disposed in a plane inclined to the axis of said shaft, means for rotating said collar, a gimbal ring surrounding said collar, means including a pair of trunnions for supporting said gimbal ring, means engaging said guideway and including a second pair of trunnions carried in said gimbal ring, the axes of said pairs of trunnions being mutually perpendicular and one of said axes being offset from the axis of said shaft, whereby the reaction of said collar against said gimbal ring as the collar rotates will cause reciprocation of the collar along the axis of said shaft, and means for imparting the reciprocation of said collar to said shaft.

3. In an abrading machine, a shaft mounted for axial movement for carrying an abrading roll, a collar carried upon said shaft and having an annular guideway disposed in a plane inclined to the axis of said shaft, means for rotating said collar, a gimbal ring surrounding said collar, means including a pair of trunnions having a fixed axis perpendicular to and intersecting the axis of said shaft for supporting said gimbal ring, means engaging said guideway and including a second pair of trunnions carried in said gimbal ring, said second pair of trunnions havin r an axis which is perpendicular to the axis of the first said pair of trunnions and which is offset from the axis of said shaft, whereby the reaction of said collar upon said gimbal ring as the collar rotates will cause reciprocation of the collar along the axis of said shaft, and means for transmitting the reciprocation of said collar to said shaft.

4. In an abrading machine, a horizontal shaft mounted for rotation and for axial movement, means for reciprocating said shaft, a cylinder within which an end portion of said shaft reciprocates, said shafthaving a groove in its periphery for conducting lubricant to the interior of said cylinder and having also an internal passage for conducting to a point of use the lubricant forced from said cylinder by the plunger action of said shaft, and means for supplying lubricant to said peripheral groove in said shaft.

5. In a machine for buiiing boot and shoe bottoms, a horizontal shaft having a projecting end portion, a housing mounted on the frame of the machine and surrounding said end portion, said housing being constructed and arranged to hold a liquid lubricant, mechanism within said housing for imparting an axial reciprocation to the shaft including a driven collar rotatable upon the shaft and having a hub portion extending through the housing adjacent to the shaft, driving means for said collar associated with said projecting hub portion, and means within said housing for conducting the lubricant to the parts of said mechanism which require lubrication.

6. In an abrading machine, a shaft mounted for rotation and for axial movement, means carried upon said shaft and movable relatively thereto for reciprocating said shaft. a cylinder for receiving one end of said shaft, and means for supplying lubricant to the interior of said cylinder, said shaft having a passage to permit the ioW of lubricant from said cylinder to the engaging surfaces of said shaft and said reciprocating means, whereby lubricant is forced from said cylinder through said passage by the plunger action of said shaft in its reciprocating movement.

7. A machine having, in combination, a housing the lower portion of which forms a reservoir for lubricating oil, a. shaft mounted for rotary and axial movement, a collar carried by the shaft and dipping into and splashing the oil in the reservoir, said collar` having an annular guidewayy disposed in a planey y vinclined to the axis of the shaft, means for rotating said collar, a gimbal ring surrounding said collar, a pair of trunnions having a fixed axis perpendicular to the axis of the shaft and su porting` said gmbai ring, a second pair o trunnions carried by said gimbal ring and having an axis perpendicular to the axis of the first pair of trunnions and offset from the axis of the shaft, a member carried by the second pair of trunnions and 'positioned in the guideway of the collar whereby the rotation of the collar causes re ciprocation of the collar am'ally of the shaft, means for transmitting reciprocation ofthe collar to the shaft, and means within the housing for collecting some of the oil splashed by the collar and conducting it to parts of the shaft reciprocating mechanism which require lubrication.

8. A11 abrading nation, a shaft, earings in which machine having, in combithe shaft is mounted for rotary and amial movement,

titi:

Gti

means for rotating the shaft, means for reciprocating the shaft., said shaft being provided with an axial oil hole and the surface of the shaft being supplied with an oil groove both communicatin with a chamber receiving an end of the s aft, and vmeans for supplying oil to said groove by which itis transmitted to the chamber whereby reciprocation of the shaft forces the oil from the chambery through the axial oil hole of Vthe shaft to parts Which require lubrication.

ln testimony whereof f have signed my name to this specication'.

missin Thomas im.

Images