US1243241A - Platen-grinding machine. - Google Patents

Description

A. R. AIVIES. PLATEN GRINDING MACHINE.

APPLICATION FILED DEC. 6, I916. 1,248,241 Patented 0ct.16,1917.

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APPLICATION FILED DEC. 6. 1916.

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PLATEN GRINDING MACHINE.

APPLICATION FILED DEC. 6. I916.

Patented Oct. 16, 1917.

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PLATEN GRINDING MACHINE. APPLICATION FILED 05c. 6. I916.

Patented Oct. 16, 1917.

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ARTHUR B. AMES, OF LA GRANGE, ILLINOIS.

PLATEN-GEINDING MACHINE.

Specification of Letters Patent.

Patented @ct. 16, 191%.

Application filed December 6, 1916. Serial No. 135,297.

To all whom it may concern:

Be it known that I, ARTHUR R. Arms, a citizen of the United States, residing at La Grange, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Platen-Grinding Machines, of which the following is a specification.

My invention relates generally to grinding machines and has especial reference to machines of this character for grinding cylindrical rolls or platens for type-writers.

One of the objects of my invention is to provide means for independently adjusting the abrading or grinding wheels, preferably of different grades, in their presentation to the work and to present said wheels in such manner that a roughing cut and a finishing cut may be made at a single pass-of the cylindrical platen.

Another object of my invention is to provide means for disconnecting the mechanism, holding the article to be ground,from the platen rotating mechanism and, by manually continuing the movement of the disconnecting lever, or means, to apply a brake to quickly stop the rotation of the platen rotating mechanism.

Another object of my invention is generally to improve the construction and arrangement of the parts of such machines by mounting the driving-motor on a base and belt-support and driving shaft directly on the bed of the machine to make it self contained, thereby avoiding the necessity of arbitrarily placing the machine in positions suitable for overhead shafting.

Other, further and more specific objects of my invention will become readily apparent, to persons skilled in the art, from a consideration of the following description, when taken in conjunction with the drawings, wherein Figure 1 is a front elevation of the machine showing parts in section.

Fig. 2 is an end elevation of the machine.

Fig. 3 is a plan view of the machine.

Fig. 4 is a section taken on line 4-4 of Fig. 5.

Fig. 5 is a broken away plan view of part of the machine showing parts in section.

Figs. 6 and 7 show the connecting mechanism for applying power to the reciprocating carriage upon which is mounted the arbor to be ground.

Fig. 8 is a section taken on line 8-8 of Fig. 3.

In all the views the same reference characters are employed to indicate similar parts.

My machine is especially designed and intended for use for grinding cylindrical platens or rolls used on typewriters. Platens of this character are made-of, more or less, yielding material, such as rubber, which may be vulcanized, to a greater or less extent, and which, being yielding in its nature, tends to crowd away from the cutting tool or wheel if excessive pressure is applied to the surface of the rotating platen. Since these platens must be accurately true in their circumferential and axial dimensions they require for their construction a specially designed machine of unusual accuracy and rather more than ordinary skill of the operator to produce them.

The base 10 of the machine consists of a laterally and rearwardly projecting portion 11 upon which to mount the source of power, such as an internal combustion engine or electric motor 1:2, and the vertically extending pedestal 13. Upon the top of the pedestal is mounted a laterally extending bed 14 provided with parallel grooves or ways 15 and 16 for the reciprocating plate or table 17, which is provided with angular parallel projections 18 and 19 finding bearings in the respective ways 15 and 16 of the bed. The table 17 is adapted to be moved longitudinally upon the bed 14 in a manner hereinafter more fully to be described.

Secured to the rear side of the bed ll are brackets 20 and 21 within which are mounted vertical posts 22 and 23, respectively. Mounted on the upper ends of the posts are shaft bearings Qi-and 25, respectively, for the power shaft 26. The motor 12 is provided with a pulley 27 which is connected with a pulley 28 on the shaft 26 by a driving belt 29 and by this means the shaft 26 is rotated.

The grinding wheels 30 and 31 are of differing grades, the roughing and fine cut finishing wheel. respectively. are mounted upon independently rotatable shafts 32 and 33, upon pairs of bearings 34 and 35, respec tively, that are supported upon the, respective forwardly and rearwardly movable brackets 36 and 37. The arbor 3'2 is driven by a pulley 38, mounted between the pair of bearings 34, through the instrumentality of a belt 39 that in turn is driven by a pulley 40 on the overhead shaft 26. The arbor 33 is driven by a pulley 41 secured thereto and which in turn is driven by a belt 42 that is connected to a driving pulley 43 on the shaft 26. Both of the abrading wheels 30 and 31 are driven in the same direction. The confronting surfaces of these wheels are dished, as at 44 and 45, respectively, to provide cavities within which to contain the attaching nuts 46 and 47, respectively, by which the grinding or abrading wheels are held to their respective arbors. The sliding bracket 37, carrying the wheel 31 is rearwardly and forwardly movable on a fixed bracket 48 that is secured to the side of the bed 14 and which is provided with parallel ways 49 and 50 upon which to guide the bracket 37, in its forward and rearward movement. The bracket 48 is slotted, as at 51, through which a vertically disposed stud 52 passes, which is secured in the bracket 37 by threaded engagement therewith, being held more firmly in place by the nut 53.

The other end of the stud 52 is provided with a transversely extending boss 54, which is threaded for engagement with the threaded end 55 of the rotatable shaft 55. This shaft extends transversely through the bed 14 and isprovided on the front end with a hand wheel 57 whereby upon rotation of the hand wheel the stud 52 is moved in the slot 51 and the grinding wheel 31, which is mounted upon the bracket 37 may be moved toward or from theplaten, or arbor 56, which is being trued up or ground in the machine. The roughing wheel 30 which is chamfered on its circumferential edge is mounted upon the bracket 36 and is slidably movable therewith in the same manner, upon the bracket 57. A bolt or stud 58, similar in character in every respect to the stud 52, is secured to the bracket 36, through a slot in the bracket 57, and is moved transversely by a shaft 60 terminating in the hand wheel 61. When the hand wheel 57 is rotated to the right or to the left, the abrading wheel 31 is moved correspondingly, and in the same manner when the hand wheel 61 is moved or rotated to the right or to the left, the roughingwheel 30 is moved to and from the work in the same manner, by a similar means. .Mounted on the reciprocatable table 17 is a head stock 62, having bearings 63 and 64 for an arbor or stub shaft 65, which is freely rotatable therein. A disk pulley 66 constituting a clutch member is freely rotatable upon the shaft by a belt 67. This belt is connected to a driving means carried on and movable with the table 17 such as an electric motor 68. The motor 68 is mounted upon the head stock 62 and is carried on the frame 69. The wheel clutch member 66 is provided in one of its faces with an inwardly tapering depression, to form a clutch member 70, for a cooperating slidable clutch member 71. The slidable clutch member 71 is rotatably secured to the shaft 65 by a feather 72 over which it is freely movable, in axial direction. The clutch member 71 is an integral part of the hub 73 which is expanded on the other end into a relatively large flat-face disk 74. The parts 72, 73 and 74 comprise a clutching member, by means of which the arbor 56 may be rotated and a brake member by which the arbor may be quickly brought to a stop. Surrounding the hub 73 is'a two piece ring 75 provided with a downwardly extending finger 76. A vertically extending lever 77 is pivoted to the head stock 62, as at 78, and preferably carries upon its upper end a weight 79, and extending laterally and inwardly from the lever 77, near the pivoted end, are two fingers 80 and 81, one on each side of the finger 76. The motor 68 rotates the clutch member 66, freely upon the shaft or arbor 65, at all times. \Vhen the lever '77 is moved upon its pivoted end to the left, as shown in Fig. 1, the clutch member 71 is brought into contact with the rotatable clutch member '66, the tapered surfaces making frictional engagement sulficient to drive the arbor 65 through the instrume'ntality of the feather 72, which engages the clutch member 71 and over which it is freely slidable, whereupon the arbor 65 is driven rotatively when passing before the abrading wheels 30 and 31, the weight on the lever 79 being sufficient to hold engaging relation between the clutch members 66 and 71. When the lever 77 is moved upon its pivoted end 78 in the opposite direction, the clutch members 66 and 71 are thus disengaged and the rotating disk 74 is brough into contact with the relatively stationary confronting disk 74, thus applying considerable friction to the present continued rotation of the shaft 65 and stopping it within a relatively short period'of time, so that the platen 56 may be quickly taken from its position in the grinding machine and another platen substituted in its place.

Fixed to the end of the shaft 65 is a clutch 83, for engaging the platen 56 and at the other end is secured to the reciprocating bed 17 a tail stock 84, provided with an axially movable shaft 85 which carries on its front end a center 86 for engagement with the appropriate end of the platen 56. The shaft 85 is secured in adjusted position in the tail stock 84, by means of a screw 87, which carries a hand lever 88. The tail stock 84 is moved along the ways on the table 17 to adjusted position, and is secured in place by a hand operated clamp screw 90.

The under side of the table or carriage 17 is provided with a longitudinally extending rack 95 which meshes with the pinion 96 carried on the shaft 97. To the front end of the shaft 97 is secured a hand wheel 98 by which the shaft 97 may be rotated by manual means when disconnected from the power driving mechanism. Secured to the outer, or rear end of the shaft 97 is a worm wheel 99, the rotation of which drives the shaft 97 and thereby the pinion 96 which operates to reciprocate the table or carriage 17 upon the ways 15 and 16, of the bed 14. The worm 100, which is secured to the shaft 101 will drive the worm wheel 99 in one direction, when the worm is in mesh therewith, and the worm 102, which is secured to the shaft 103, will drive the Worm wheel 99in the opposite direction, when in mesh therewith. The outer end of the shaft 101 finds bearing in an oscillating bearing 104 at the upper end of the vertically movable rod 105. The shaft 103 finds bearing in a similar box 106 in the lower end of the rod 105. The rod 105 is supported in fixed bearings 107 and 108. A spring 109, secured to the bearing 106, normally holds the worm 100 in mesh with the worm wheel 99, and the worm 102 alternates therewith.

In Fig. 6, we find both worms 100 and 102 out of mesh with the worm wheel 99, being held thereby by controlling mechanism 112. The outer end of the shaft 103 finds bearing in a swiveling bracket 103 to permit some lateral movement of the shafts 101 and 103 to bring the worms 100 and 102 into and out of mesh with the worm wheel 99. Secured to the shaft 101 on the inside of the bracket 113 is a drive wheel 114, driven from the shaft 26 by means of a belt 115 and a pulley 116. The latter is fixed upon the shaft 26. Secured to the outer end of the shaft 101 is a two step pulley 117, 118. Either of these pulleys may be connected to a similar pulley 119 on the shaft 103, the latter being driven by a belt 120. The object of the two step pulley is to change the relative speed of the shafts 101 and 103 so that the table 17, carrying the platen 56, and means for driving it, may be moved before the abrading wheels 30 and 31 with a relatively slow speed during the time when the abrading Wheels are cutting and returned to the initial or starting point at a greater speed, to increase the efliciency of the machine.

Means for connecting the driving power to the reciprocating carriage 17 consists of mechanism that is preferably automatically thrown into and out of gear by the operation of the carriage. A shaft 122 extends transversely of the pedestal or base 13 and carries on its front end a vertically extending lever 123. This lever is in the path of adjustable stops 124 and. 125 that are adjust-ably fixed to the front side edge of the table 17, whereby to stop and reverse the carriage 17 in its longitudinal movement over the bed 14. On the rear end of the shaft 122, and extending upwardly is a crank arm 126 which is pivoted to a link 127 (see Figs. 6 and 7). The other end of the link 127 is pivoted to a rocking trigger 128 which in turn is pivoted to a stationary part of the bed 14, as at 129. The vertically moving rod or shaft 105, carries a laterally extending plate 130. When the trigger 128 is in the position shown in Fig. 7, the plate 130 will bear upon the upper flat of the trigger 128 and the spring 109 will hold the shaft downwardly with the worm 100 in mesh with the gear wheel 99. This will move the table 17 in a direction toward the initial point from which it started after a out has been made. WVhen the bed has arrived at a point where it is desired that it should be stopped, the stop 124, on the table 17 will be brought into contact with the vertically disposed lever 123 which will move the lever into a position shown in Fig. 6, in which position the trigger 128 raises the plate 130 just enough so that both the worms 100 and 102 will clear the gear wheel 99. At this time the table 17 may be moved either backwardly or forwardly by the hand wheel 98, as desired. The lever 123 is provided with a downwardly projecting finger 123 which engages a pivoted latch member 132, which is pivoted, as at 133, to a relatively stationary part, and which is provided with a notch 134 on one of its ends.

Vhen the lever 123 is in the position shown in Fig. 6 the finger 1234 projects into the deepest part of the notch 134 and the spring 135 yieldingly holds the lever 123 in the position in which it has thus been placed, the spring 109 not being strong enough to over-' come the spring 135 to bring the trigger 128 into position shown in Fig. 7, therefore the carriage 17 will remain stationary until the lever 123 is again moved. To start the carfrom the initial point of rest, toward the grinding wheels 30 and 31, the lever 123 may be manually moved to the left which will bring the face 128' of the trigger 128, under the plate 130 which will bring the worm 100 into mesh with the worm wheel 99. For reversing the direction of rotation of the latter and driving the table 17 in the opposite direction the lever 123 should be moved to the right of the position shown in Fig. 6 which will bring the face 128 under plate 130 and raise the worm 102 into mesh with worm wheel 99. The top 124 on the carriage 17 will move lever 123 into neutral position-as shown in Fig. 6-when it makes contact therewith.

Before the plate 56 is removed from the carriage the lever 77 is moved to the right, whereupon the rotating disk 74 will be brought into contact with the relatively stariage'or table 17 in the operative direction,

tionary disk 74, and the rotation of the platen will be quickly stopped. After the platen has been replaced, with one to be ground, the lever 79 is thrown to the left, to engage the clutch members 66 and 71, whereupon the platen will be revolved, by the operation of the platen driving means, such as the electric motor 68 which travels with the table 17.

A hood 140 partly surrounds the abrading wheels 130, 131 and is connected with a pipe 141 to carry away the comminuted material ground off from the platen.

The coarser grinding wheel 30 is chamfered on its circumferential face so as to prevent the formation of a shoulder on the platen, when a coarse heavy cut is being taken and giving a larger cutting'surface of the coarse wheel. The finishing wheel is presented with a'face parallel with its axis to produce a smoother finished surface on the platen.

While I have herein disclosed a single embodiment of my invention for a clear disclosure of the same, it will be manifest that variations therefrom may be made in the configuration and disposition of the parts within the scope of the appended claims.

Having described my invmtion, what I claim is 1. A platen grinding machine comprising means to hold and rotate the platen; means to relatively and axially move the platen and grinding wheels; a plurality of rotatable grinding wheels, of differing grades, and means for independently adjusting said wheels toward and from the platen, whereby to make a roughing and finishing cut with one pass of the platen.

2. A platen grinding machine comprising means to hold and rotate the platen; means to bodily move the platen axially, before the grinding wheel; two rotatable parallcl grinding wheels, of differing grades, having their confronting faces dished to provide cavities within which to contain means for attaching said Wheels to theirArespecth'e shafts; a shaft for each wheel, and independent means for moving said wheels to and from the platen.

3. A platen grinding machine comprising means to hold and rotate the platen; means to bodily move the platen, axially, before the grinding wheels; a relatively coarse grinding wheel having its circumferential edge chamfered to make a more extended rou hing cut; a relatively fine, parallel grindlng maaaar wheel, having its circumferential edge in a plane parallel with its axis; means for independently rotating said grinding wheels and means for independently moving said wheels to and from the platen.

4. A machine of the class described comprising a base; a table bed thereon; a reciprocatable table. longitudinally movable on said bed; a platen arbor rotating mechanism, carried by the table and moving therewith; grinding mechanism mounted on the bed; shaft supports, mounted on the bed, for an overhead driving shaft; an overhead shaft mounted in bearings carried by said supports; a motor, mounted on said base for rotating said shaft; power-transmitting means, operable by said shaft, to reciprocate said table and to rotate said grinding wheels, and independent driving means, carried by the table and movable therewith, to rotate said platen.

5. In a machine of the character described, the combination of a reciprocatable table, carrying a rotatable part to be ground; a bed upon which grindin apparatus is rotatable and mounted; a racr on the bottom of said table; a shaft mounted on said bed; a pinion on said shaft meshing with said rack to drive the table; a worm-wheel on said shaft; two worms for alternate engagement with said worm-wheel to reciprocate the table, and means, operable by the table to disengage one worm and engage the other to move the table in opposite directions.

6. In a machine of the character described the combination of a bed; a table reciprocatable thereon; a head-stock and a tailstock, mounted on said table, to carry a platen to be ground; a clutch member loosely mounted on the shaft of said head-stock;

means carried by the table for transmitting power to said clutch member to'rotate the platen to be ground; a fixed disk on the head stock; a double-disk. clutch-member rotatable with the shaft and axially movable thereon and a lever to move the latter member into clutch engagement with the rotating clutch member, to rotate the arbor, and into contact with the fixed disk to stop rotation thereof.

In testimony whereof I hereunto set hand in the presence of two subscribing nesses.

my wit- ARTHUR R.-AMES. In the presence of Fomn BAIN,

MARY F. ALLEN.

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