US2407557A - Article surfacing machine - Google Patents

Description

Sept. 10, 1946.

' R. F. KNEISLEY ARTICLE SURFACING MACHINE Filed May 16, 1945 2 Sheets-Sheet 1 p 1946. R. F. KNEISLEY 2,407,557

ARTICLE SURFACING MACHINE Filed May 16, 1945' 2 Shets-Sheet 2 210 mm]? fflmszzr "w, w

Patented Sept. 10, 1946 ARTICLE SURFACIN G MACHINE Richard F. Kneisley, Toledo, Ohio, assignor to Kneisley Electric Company, Toledo, Ohio, a

partnership Application May 16, 1945, Serial No. 594,024

3 Claims.

Thlsinvention relatesto machines for grinding and truing the surfaces of tubular or cylindrical members, and is particularly adapted and intendedfor operation on short tube lengths of rubber, or other plastic material.

The primary object of the invention is the provision. of a simple and efiicient machine of this character which will simultaneously operate on a plurality of work-pieces to not only grind or abrade the surfaces thereof, but also to render them uniform as todiameter and surface configuration.

Further objects and advantages of. the invention will be apparent from the following detailed description of the invention and from the accompanying drawing illustrating one embodiment thereof, in which r Fig. 1 is a side elevation of a machine embodying theinvention, with the grinding wheel near the left end of its stroke Fig. 2 is a vertical cross-section on the line 2 2 inFig; 1; Fig.3 is a similar section on the line 33 in Fig. 1; Fig. 4 is a fragmentary sectional detail on the line 4-4 in Fig. 2, and Fig. 5 is an enlarged sectional detail on the line 5-5 in Fig. 2, with parts in full, and Fig. 6 is a diagram of the wiring.

Referring to the drawings, l designates a substantially flat table or frame; supported by standards 2 and carrying the operating parts of the machine. Fixedly mounted on the top of the table 1 near one end on standards 3 is a pair of, axially spaced. disks 4 held apart and braced by a plurality of tie-rods 5, eight in the present instance, which are equidistantly spaced in concentric .relation around the aXis of the disks. Carried by the disks 4, with one midway between each pair of adjacent rods 5, is a set of workcarrying spindles 6 and I, the former being the live spindle and the other the dead spindle. These spindles are provided at their adjacent ends with conical centers 8 for engaging the respective ends of .a work-carrying mandrel 9 for concentric turning therewith. The dead or tail spindle 1 -is adapted to have limited axial movements in a sleeve I flcarried by the respective disk 4 and is held in yielding center engagement with the mandrel by theaction of a coiled expansion spring H. The live spindle is provided with a radially projectingpin l2 wich engages an L finger i3 projecting from the adjacent end of the mandrel 9 and causing the mandrel to turn with the spindle. The finger 13, in the present instance, is carried by a collar l4 that is held in adjusted positionithereon by. a set-screw.

2 [5. A work-piece l-B 0f tubular form is mounted on the mandrel 9 with a sufficiently tight fit to frictionally turn therewith. This work-piece, which constitutes a short length of tubing of soft rubber or plastic'material, is mounted on and removed from the mandrel 9 at the tailpiece end thereof before engagement of the mandrel between the centers 8.

The several work-pieces I6, when mounted on the mandrels 9 and held in working position by the sets of spindle centers 8, are disposed in circular series concentric to the axes of the disks 4 in position to be circumferentially engaged-by the peripheral surface of an abrading wheel l1, that is rotatably mounted within the annular space. defined, by. the work-pieces, as hereinafter described. l

The several spindles 6 are driven in unison by a chain l8 extending around spindles I19 on the outer ends of the spindles, and this chain, between two of said sprocket Wheels, extends over a drive sprocketwheel 20 on a drive shaft 2|. This shaft is journaled in standards on a bracket 22 which is mounted on the left end portion of the table I for vertical adjustment to tighten or slacken the chain l8. In the present instance, a motor 23 for driving the shaft 21 is attached to the under side of the adjacent end portion of the table I and has'a suitable belt and pulley driving connection 24 with said shaft; I

The abrading Wheel ll, which is preferably of a nature to grind and reduce the surfaces of the member l6 so as to render them of uniform diameter, is mounted on a'shaft 25 projecting from and driven by the rotor member of a motor 25, and disposed centrally of the set of mandrels 9. This shaft extends beyond the abrading wheel ll and is mounted at each side of such wheel in bearings 21 within tubular housing sections 28, the inner one of which relative to the motor 26 is fixedly attached to the motor housing. These housing sections project through center bearing openings 29 in the disks 4 and the outer one is prevented from turning with the shaft by a feather 30 thereon engaging ,a recess in the opening wall of the respective disk.

The motor 26 is mounted on a carriage 32 for axial movements toward and away from the adjacent disk 4. This carriage is mounted on a track 33 supported by the table I. A feed-screw 34 fixedly projects from the outer or right hand end of the housing oi the motor 26 through the hub of a pulley 35 in threaded engagement therewith. Thi pulley is suitably mounted in standards 3B rising from the table I and held thereby 49 suspended from the bottom of the right end.

portion of the table I, such driving being through a pulley and belt connection 4! toza'count'ershaft 42, and thence from a pulley on said shaft and belt 43 to the feed-screw pulleyiiifir' The;motor- 49 is of the reverse type so as to drive thefeedscrew 34 in either direction as desired, and is controlled by a reversing switchllfi ofTwhichAB is the control handle.

When the carriage 32 is at the limitpfits" movement to the left, anarm 4! thereon engages the control button of-anormally closed: limit switch48"and opens the motor controlcirc-uit,- and wh'en at the limit of its'travel' toztherig ht an arm'41' thereon engages the control'button of a normally closed limit switch wand a'gain'opens" said" motor' control circuit. Since: th'e'operation of'the travel motor 40 is controlled by limiti switches, normally openshunting switches 505 and 51 are provided in parallel'with'the' respective switches 48 and '49"to'loe.'selectively closed during starting of the travel motor to 1 return it' in the opposite direction. Thus, to accomplish" its return; the 1 control arm: 4'6 of the reversing switch 45' is th'r own in th'e oppo'site direction 'aft'eriwhich' the respective *sh'unt switch, 50 or 51', is'normally held closed until the" carriage has started: and: moved sufiiciently in the opposite direction: to effe'ct' release of the limit switch','when.the:.shuntin'g switch maybe released. Itisgpparent'that.

the carriage 32 and grinding wheel I! come :to' rest" at each endof their strokes and remaintat rest until the reversing switch 45 'has'b'een thrown and the respective shunt'switc'h' 50 5]; closed.

In the wiring diagram shown in'Fig;i6,:arthreewire-main line circuit having wires 11, b, and c;

switch 45 is disposed in two of the branch leads to the travel motor 40. Themotorswitch' 53is of the-normally open electro-magnettype, with its solenoid coil disposed in thecontrolcircuit. g'i'n wh'ic'h the two limit switches 48 -an'd 49 are disposedso thatwhen either of said limit switches,- or a-control switch 55, in thecircuitg, is "ope'n'the coil is deenerg ized' so that th'e'motor, contro1 switch 53 isopen and the motors are at rest;

Inth'e operation of the'machine, the grinding of'the work-piecesoccurs during axial travel of the-grinding wheelin on'e direction or the other and-when the wheel travel is atrest'ate'ach end of its stroke, the mandrels are removed with the groundwork-pieces thereon topermi't removal of such pieces fromthe mandrels. When thishas been done and other'workpieces placed on the mandrels, the latter are replaced in connection with-thespindles 8 and the button of the shunt switcliBfl', 5|, associated with the limit switch thatis'th'en open, is pressed to closethe motor control" circuit g and to retain it closed until the carriage 32' is'mo-ved sufficiently in its reverse direction-to release the'engaged limit switch button. The carriage then continues its travel movement until the opposite limit switch has been engaged and opened to effect an opening of the motor control switch 53 and a stopping of the travel of the grinding wheel at the opposite end of it stroke, removal of the ground workpieces and substitution of others on the mandrels may again be repeated.

' I wish it understood thatgmy invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spiritof the claims.

Having thus described my invention, what I claim as'new; and desire to secure by United States-Letters- Patent, is:

1. In a'machine'of the class described, a mandrel mountedrfonrotary movements and adapted to hold an axially elongated cylindrical workpiece, means including an electric motor for rotating said mandrel and work-piece, a carriage mounted for reciprocatory movements-in-aaplane parallel. to the. axis r of rotation: ofthe' mandrel, an electric'motor mounted'on saidcarriage for movement therewith;'a grinding wheel driven by" said last motor forperipheralengagement with a side'of "the work-piece carried 'by the mandrel and for movement with the motor to causethe wheel to traverse from one end to the other of the work-piece; feed means including an electric reversing motor for imparting predetermined opening one or' the other of said limit switches when the carriage'is at one or-theotherend'of its intended-reciprocatory'movement, a normally open shunt switch in said control circuit in association with each limit switch and operable to close the control circuitduring an open period of theassociated'limit switch, and a manually operable reversing switch in circuit with said reversing motor.

2. In'a'machine of the'classdescribed, a'plu ra'lity of mandrels eachfor holding atubular, work-piece, means for-releasably holding said. mandrels in circular series with their-axes. parallelandfor rotating-each mandrel about'its -axis,. anabrading wheel mounted within the series of to impart axial movements to said wheel to move.

it'lengthwise ofthe work-pieces, a second motor. for drivingjsaid feed means, an electriccircuit including, said'motors; a normally open electromagnet switch for closing said motor circuit, and

an electric 'controlycircuit operable when closed to efie'ct a closing of said switch and including a normally closed limitiswit'ch that. is automatically operable to open said control circuit at. a, predeterminedpoint in an axial movement ofsaid wheel and. its driving motor.

3. In a machine of the class, described, a mandrel'ifor holding and rotating a cylindrical work-j piece, means includingan electric motor for driving said. mandrel, a grinding wheel 'rnounted" for axialreciprocatory travel and to have peripheral;

grinding coaction'with the surface of the workreversing switch in circuit with said reverse mo- 6 tor, two normally open limit switches and a control switch in said control circuit, means movable with said wheel and its motor during axial travel thereof to engage and open one or the other of said limit switches at the end of each stroke of said wheel and its motor, and means associated with each limit switch and manually operable to closethe control circuit during an opening thereof by the associated limit switch.

RICHARD F. KNEISLEY.

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