US2741076A

US2741076A - Ware foot abrading machine

Info

Publication number: US2741076A
Application number: US210952A
Authority: US
Inventors: Jordan Jacob
Original assignee: SHENAUGO POTTERY Co
Current assignee: SHENAUGO POTTERY Co
Priority date: 1951-02-14
Filing date: 1951-02-14
Publication date: 1956-04-10
Anticipated expiration: 1973-04-10

Description

April 10, 1956 J. JORDAN WARE FOOT ABRADING MACHINE 3 Sheets-Sheet 1 Filed Feb. 14, 1951 11F]! Illllllllllll lllllllllllll Illl INVENTOR Jacob Jordan BY Qu ck 5 14 2.

ATTORNEYS April 10, 1956 J. JORDAN 2,741,076

WARE FOOT ABRADING MACHINE Filed Feb. 14, 1951 s Sheets-Sheet 2 Jacob Jordan ATTORNEYS April 10, 1956 J. JORDAN WARE FOOT ABRADING MACHINE 3 Sheets-Sheet 3 Filed Feb. 14, 1951 INVENTOR Leah Jordan BY 6&

.. I JIIIIIIIIII({(((( mun ATTORNEYS posite end of the shaft 45.

These threads are engaged by a nut segment 52 which is removably secured to the body 44 by any suitable means, such as a bolt 55 and plate 56. Extending from the center of the shaft 45 to the left end thereof, as reviewed in Figure 4, is a slot 57. Keyed to this slot is a ratchet wheel 59 which rotates in the portion 60 of the body 44. A spring loaded holding pawl 61 prevents rotation of the ratchet wheel in the counter-clockwise direction as viewed in Figure 7.

Mounted for vertical reciprocation in the portion is a rod 63. A shoulder 64 limits upward movement of this rod. A washer 65 bears against another shoulder 66 on the rod 63 and retains a spring 67 which constantly urges the rod upwardly. Fixed to the rod 63 by means of a bolt 68 and nut member 69 is a resilient pawl 70. With each downward movement of the rod 63 the ratchet wheel 59 is advanced one tooth. Adjacent each abrading wheel mounting assembly on the turntable 12 is a vertical plate 72 having adjustably bolted thereto an abutment 73 which extends over a domed nut 74 threaded to the end of the rod 63.

Under each arm 41 is a lifting rod 75 which passes through the turntable 12 and is supported for reciprocating movement by a suitable sleeve 76 and sleeve inserts 77. A stud 78 on the lifting rod 75 engages a slot in the sleeve'76 to prevent rotation of the lifting rod. A roller 80 is fastened to the lower end of the lifting rod. This roller is adapted to engage a fixed .cam 81 as the particular associated abrading wheel mounting assembly approaches the station A. The fixed cam 81 is supported by an assembly bolted to the base plate 7 and generally indicated at 82 in Figure 2. This assembly is also used to support an upper bearing 83 for the vertical shaft 25.

Details of the resilient ware chuck 14 may be seen in Figure 4. The chuck is adapted to receive a piece of ware 85, the rim of which rests upon a suitable soft or resilient ring 86. A plurality of upstanding lugs 87 have a piece of resilient material 88, such as a suitable type of rubber, attached on the inner side thereof. With this arrangement the ware is free to be urged slightly from one side to the other in its resilient mounting.

Each of the abrading wheels 50 is soft or friable enough to enable a ware foot 90 to wear or form its own groove therein. Wheels of this nature may be made from a wheel may also be made in the form of a low pressure pneumatic tire supporting an abrasive band. The tire is inflated to grip the band andhas enough flexibility to allow it to curve around the contour of the foot.

In operation,.the motor 30 is constantly driven to keep the turntable 12 turning. As a given chuck'14 passes station A, its associated pulleys are out of contact with the belts 16, so that the chuck is not turning on its own axis. A piece of ware is placed in inverted position on the chuck by an operator. As the turntable 12 progresses, the pulleys 15 associated with the particular chuck come into contact with the belts 16 and the chuck begins to turn.

At station A the abrading wheel mounting assembly associated with the particular chuck is held in raised position by the push rod 75. As the chuck leaves staremainder of the cycle of turntable 12 until the particular chuck again approaches station A. At this time the pulleys 15 move out of contact with the belts 16 and the chuck stops turning. The roller 80 contacts the cam 81 and causes the push rod 75 to lift the abrading wheel mounting assembly. As this occurs, the nut 74 on the end of the rod 63 strikes its associated abutment 73 to depress the rod 63 and thereby index the ratchet wheel. 59 by one tooth. The shaft is simultaneously rotated through the same angle and, through interaction of the threads 51 and the nut segment 52, is caused to advance slightly to the right as viewed in Figure 4. By means of this indexing arrangement, a fresh portion of the abrading wheel is presented to successive pieces of ware.

After the abrading wheel 50 has been raised and the chuck 14 has stopped turning relative to the turntable 12, the ware is unloaded by an operator. A fresh piece of ware to be abraded is then placed in the chuck by the same operator and the operations described above are repeated.

After a number of pieces have been polished, the used portions of the abrading wheel will form an interrupted spiral path as shown in Figure 5. When the entire surface of the abrading wheel has been used, it is replaced by a fresh one. A used wheel may be redressed to remove the surface notches and may then be re-used. This may be repeated until the wheel is too small in diameter to func-;

rim of the ware foot are almost always slightly out of 7 round with respect to the vertical axis of the ware and with respect to each other. However, the groove worn by the foot in the wheel 50 together with the resilient mounting 88 enable the abrading wheel to guide the ware, so that tion A, roller 89 rides down off cam 81 causing the the ware is caused to make slight transverse movements in the resilient mounting to compensate for any irregularity of dimension. In this manner, effective automatic abrasion of the ware feet is accomplished despite the dimensional irregularity of successive pieces of ware.

In order to simply remove irregularities on the ware feet by abrasion, rather than to actually cut or reshape the feet, it is preferable to rotate the chucks 14 at a relatively low speed. This low speed also facilitates tracking of each foot 90 and avoids any problem of inertial resistance to high speed transverse movement of ware in the resilient mountings.

While a practical and presently working embodiment of the invention has been herein disclosed, it is to be understood that many alternatives in construction will suggest themselves to those familiar with associated arts. For instance, other drive linkages'and other polishing wheel lifting mechanisms may be provided. The. chuck lugs 87- may be made adjustable to accommodate various sizes of ware, or, to enable still faster changeover between various sizes of ware, chucks of various sizes may be provided having a standard coupling projection mating l. Inan abrader, a turntable, means to rotate said turntable past a fixed station and about a central axis, a plurality of arms hinged to said turntable, a plurality of ware receiving chucks rotatably mounted on said turntable, each of said chucks being associated with one of said arms, means to rotate any given chuck relative to said turntable at all times except when said given chuck is opposite said fixed station, abrading wheel means carried on each of said arms, means to raise each of said arms as it approaches said fixed station and to lower each of said ..;arms;as it, leaves said fixed station whereby saidabra'ding :iwheelmeans are raised from and lowered to contact with were carried by said chucks, and means holding each said turntable, each said abrading wheel means comprising a friable abradingaggregate penetrable by relatively moving edges .of chuck-held ware.

,2. -In amachine for abradingpiecesof warelhaving at least one upstanding circular ridge varying in distance from the ware axis of revolution by not In re than a first dimension, ware chuck means mounted on a base rotatable about an axis of rotation and mounting successive pieces of ware for resilient transverse movement through a second distance relative to said axis of rotation, said second distance being at least equal to said first dimension, means to rotate said chuck means in transverse planes to rotate successively held pieces of ware about their axes of revolution, abrading means penetrable by said ware, means to periodically position said abrading means in apposition to said chuck means and in fixed position relative to said base and to remove said abrading means from said apposition whereby engagement of said abrading means with said ware ridges will be successively etiected and terminated.

3. In a machine for abrading pieces of ware having at least one upstanding circular ridge varying in distance from the ware axis of revolution by not more than a first dimension, a plurality of ware chucks to mount successive pieces of ware for resilient transverse movement through a second distance relative to each of said chucks, said second distance being at least equal to said first dimension, first means to successively translate each of said chucks through a cycle, a second means to rotate each of said chucks in transverse planes to rotate successively held pieces of Ware about their axes of revolution, a plurality of abrading tools penetrable by said ware, each of said abrading tools being associated with one of said chucks, third means to periodically position each of said abrading tools in apposition to its associated chuck and in fixed position relative to said first means and to remove each abrading tool from said apposition whereby gripping and abrading engagement of each of said abrading tools with ware ridges will be successively effected and terminated.

4. In a machine for abrading pieces of ware having at least one upstanding circular ridge varying in distance from the ware axis of revolution by not more than a first dimension, the combination comprising a chuck rotatable about its longitudinal axis in a mounting, resilient work gripping means on said chuck, said work gripping means being displaceable by gripped work through a second distance at least equal to said first dimension, abrading means adapted to be placed in apposition with the face of said chuck means to bear on work gripped in said chuck, means to hold said abrading means stationary relative to said chuck mounting during the time said chuck is rotated relative to said chuck mounting, said abrading means comprising an abrading aggregate penetrable by ware to be abraded whereby said abrading means is grooved by initial contact with successive work pieces and thereupon shifts successive workpieces trans versely in said chuck to compensate for workpiece dimensional variation.

5. In a machine for abrading pieces of ware having at least one upstanding circular ridge varying in radial distances from the ware axis of revolution by not more than a first linear amount, the combination comprising a chuck rotatable in a mounting and adapted to receive successive pieces of work for rotation with said chuck, said chuck comprising resilient gripping means transversely displaceable by gripped work through a second distance at least as great as said first linear amount, abrading means movable into and out of contact with .6 work gripped in said chu k, said abrading,means comprising an abrading aggregate penetrable by ware to be abraded. a g

6. An abradingmachinecomprisinga.table, mounting means to successively rotatably mount on'said table work pieces each having ansupstandingiacircnlar ridge',sabrading =means mounted-onesaid .tablesand comprising an abradingaggregate penetrableby :eachof said ridges to establish gripping. and-abrading tcontact therewith, :means to-successively bringlsaid abrading-means in contact with ri'd gee on workpiecessuccessively.mounted insaid mounting means whereby ridge-abrading means gripping contact thereby established will, in response to variation in ridge radius, cause transverse ware-abrading means shifting relative to said table, and resilient means to yieldingly accommodate said shifting.

7. The combination defined in claim 6 together with means to present a fresh portion of said abrading aggregate to successive work pieces.

8. In a device, a turntable, means to rotate said turntable past a fixed station, a plurality of ware receiving chucks rotatably mounted on said turntable, means to rorate any given chuck relative to said turntable at all times except when said given chuck is opposite said fixed station, abrading means associated with each of said chucks, means to lower each of said abrading means into contact with ware held by each associated chuck as said associated chuck leaves said fixed station and to raise each of said abrading means from contact with said ware held by each associated chuck as said associated chuck approaches said fixed station, and means holding each said abrading means against movement relative to said turntable throughout the majority of each rotation of said turntable, said abrading means comprising friable abrading aggregates penetrable by relatively moving edges of chuck-held ware, and means to automatically present a fresh portion of each of said abrading means to successive pieces of ware held in each associated chuck.

9. In an abrader, a turntable, means to rotate said turn table past a fixed station and about a central axis, a plurality of arms hinged to said turntable, a plurality of ware receiving chucks rotatably mounted on said turntable, each of' said chucks being associated with one of said arms, means to rotate any given chuck relative to said turntable at all times except when said given chuck is opposite said fixed station, abrading wheel means carried on each of said arms, means to raise each of said arms as it approaches said fixed station and to lower each of said arms as it leaves said fixed station whereby said abrading wheel means are raised from and lowered to contact with ware carried by said chucks, and means holding each said abrading wheel means against rotation about its own axis throughout the majority of each rotation of said turntable, each said abrading wheel means comprising a friable abrading aggregate penetrable by relatively moving edges of chuck-held ware, and said abrading wheel means comprising a cylindrical wheel carried on a shaft threadedly engaged with said arm, ratchet means associated with said shaft whereby when said arm is raised said ratchet means turns said shaft to rotate and advance said cylindrical wheel relative to its associated chuck.

10. In a ware foot finisher a plurality of chucks, first means to successively translate each of said chucks through a cycle, second means to rotate each of said chucks relative to said first means at all times during said cycle except during at least one minor portion of said cycle, third means to bring an abrading tool in contact with work carried in each one of said chucks at all times except during said at least one minor portion, and means holding said abrading tool against movement relative to said first means throughout a majority of said cycle, each said abrading tool comprising an aggregate penetrable by relatively moving edges of chuck-held ware, and indexing means to present a fresh surface of said abrading tool to said work during successive cycles of said each one of said chucks.

7 Refe re'nces Cited in the file of this patent UNITED STATES PATENTS 5 Munday Oct. 6, 1931 Rank: Oct. 4, 1932 Raule Apr. 25, 1933 Johnson Jan. 25, 1938 m Dunbar et a1. Dec. 27, 1938 Leguillon et a1 Oct. 31, 1939 8 Wallace Q Mar. 26, 1940 Flygare Apr. 22, 1941 Carlson Feb. 3, 1942 Phillips Jan. 26, 1943 Carlson -5. June 12, 1945 Hutto Nov. 21, 1950 FOREIGN PATENTS Austn'a Apr. 25, 1916 Germany Mar. 27, 1922