US2116108A - Model positioning means for grading machines - Google Patents

Description

May 3, 1938. FAUNCE MODEL POSITIONING MEANS FOR GRADI NG MACHINES 3 Sheets-Sheet 1 Filed March 12, 1937 lnvenTor.

. Leroy L .Fc1uhce bymal W May 3, 1938. L. FAUNCE 2,116,108

MODEL POSITIONING MEANS FOR GRADING MACHINES Filed March 12, 1957 s Sheets-Sheet 2- InvenTor. Leroy L. Founce May 3, 1938.

L. L. FAUNCE MODEL POSITIONING MEANS FOR GRADING MACHINES Filed March 12, 1937 3 Sheets-Sheet 3 k lnvenror. Leroy L.F aunce bym AI'iys.

Patented May 3, 1938 PATENT oFFicE MODEL POSITIONING MEANS FOR GRAD- ING MACHINES Leroy L. Faunce, Dorchester, Mass. Application March 12 1937, Serial N0. 130,546

' 12 Claims.

This invention relates to improvements in model positioning means operable to duplicate the outline of a master model either in thesame size or any size proportionally increased or decreased from that of the model. In such duplicating machines a tracer, which is caused to follow the outline of the model, actuates, through suitable mechanism, a scriber in such manner as to duplicate the outline of the model eitherin an identical size or any proportionately larger or smaller size. The mechanism for enlarging or diminishing the size of the scribed outline is of a pantograph type, or its equivalent, provided with suitable adjustments to enableit to produce is the desired size of outline. The term scriber is used herein to designate any form of marking or cutting device for the outline which is produced by the action of a tracer which is caused to follow the outline of a master model. I

In many instances, particularly in: grading patterns for shoes and the like, it is desirableto modify certain proportions of the outline produced relatively to those of the model without modifying other portions of the outline with respect to those of the model.

The object of the present invention is to provide a model positioning means for a machine of this type comprising means for supportingthe master model in such position that by causing the tracer to follow a predetermined section of the outline of the model the outline produced by the scriber will be proportional touthat followed by the tracer and-having means for so adjusting the model angularly with relation 'toits normal 35 position that when the tracer iscaused to follow an adjacent section of the outline of the model the scriber will be moved in a path'varying from that which it would follow if the model-were in its normal position, but will cause the outline of 40 the modified section to merge into the outline produced when the model is in its normal position Without interrupting the continuity of the cut lines of the adjacent section.

A preferred embodiment of the invention isil- 5 lustrated in the accompanying drawings 'as applied to a pattern grading machine for producing patterns of the same and different sizes for portions of shoes; The illustrations herein show the application of the invention to thepro- 50 duction of patterns for seamless Vamps of shoes in which the toe portion and the quarter portions of the vamp are integral. In the manufacture of this type of shoe it is desirable that the heel portion of the quarter for different sizes: shall 55 be maintained at approximately the same width.

When patterns of different sizes are made from a master model by usual grading machines, the Width of the heel portion of the quarter is increased or decreased for different sizes in proportion to the increase or decrease in size of the toe portion of the vamp. In order, therefore, to produce the desired width of the heel portion of the quarter it is necessary to vary the adjustments of the duplicating mechanism of the grading machine during the grading operation which requires great accuracy and skill. Furthermore, the result of adjustment of such duplicating mechanism will not cause the outlines produced bylthe normal and adjusted positions of adjacent sections of the pattern to merge properly into a continuous outline. It has, therefore, been customary when larger sizes than that of the model are produced to trim off such excess material as may be necessary to produce the desired width of the heel portion of the vamp.

One of the objects of the present invention is to provide readily operable means for adjusting the angular position of the master model from its normal position in such manner that a desired pattern outline may be produced therefrom by adding to'or decreasing the width of desired sections of the pattern from that which would normally be produced by the duplicating mechanism.

In certain instances, as in the grading of patterns for shoes, it is desirable to maintain cer- 3O tain sections of the pattern the same for all sizes of patterns produced by the grading machine while maintaining the proper outline and width for other portions of the pattern. Another objecto'f the invention is to provide means for ad- '35 justing the master model to accomplish this purpose.

These and other objects and features of the invention will more fully appear from the following description and the accompanying draw- 40 ings and will be particularly pointed out in the claims.

"A preferred embodiment of the model positioning mechanism designed particularly for use in a pattern grading machine for producing patterns forparts of shoes is illustrated in the accompanying drawings, in which,

Fig. 1 is a plan view of the model plate of the machine provided with a rotatable adjustable table to which a master mode-l, which is illustrated in dotted lines, as a seamless Vamp for shoes, may be secured;

Fig. 2 is a front view of the construction illustrated in Fig. 1; l

Fig. 3 is an underneath plan view of the same. a portion of the model plate being cut away;

Fig. 4 is a detail view, mainly in vertical section on lines 44 Fig. 3, illustrating the manner in which the rotatable table is supported, and showing also the mechanism by which the table is clamped in any desired position;

Fig. 5 is a detail sectional view showing the manner in which the master pattern is secured to the rotatable table;

Fig. 6 is a detail sectional view on lines 66 Fig. 1 showing a scale seated in a recess in the model plate and also illustrated above it a supplementary scale adapted to be secured to the seated scale;

Fig. '7 is a diagrammatic view showing the master model in full lines in normal position and in dotted lines in adjusted positions for the purpose of proportionately enlarging the major portion of a pattern before diminishing the heel portion of the vamp of such enlarged pattern;

Fig. 8 is a diagrammatic view showing in full lines the enlarged pattern produced by tracing the model in normal and adjusted positions illustrated in Fig. '1 showing in dotted lines the outline of the master model and in dot and dash lines the margin of the areas reduced by adjustment of the master model; 7

Fig. 9 is a diagrammatic view showing in full lines the model in normal position and in dotted lines. one of the two adjustments of the model required to enlarge the throat of the pattern produced by the scrlber when the tracer is caused to follow the pattern in normal and in adjusted positions; and,

Fig. 10 is a diagrammatic illustration in full lines of the pattern produced by the scriber when the tracer is caused to follow the outline of the model partially in normal and partially in adjusted position, and illustrating in dotted lines the outline of the model and in dot and dash lines the margins of the areas reduced by adjustment of the master model. 7

In the construction illustrated the model plate I is a rectangualr, preferably flat square steel plate, adapted to be set into and clamped in any suitable manner in the usual bed plate of a pattern grading machine of any well known type. The model plate I is provided with a circular opening 2 in which is mounted a flat rotatable table 3 the surface of which is preferably flush with the upper surface of the model plate The table 3 is provided with a plurality of slots 4 extending parallel to the front of the machine and which may register with like slots 5 in the model plate and also with slots 6 extending at right angles to the slots 4 which in turn may register with like slots 1 in the model plate. The table may also be provided with additional slots 8 parallel to the slots 6 which in turn may register with slots 9 in the model plate. All of these slots are undercut as illustrated in Fig. 5 to receive and form guideways for the square heads of bolts l0 by means. of which the master model M usually a metal plate having the desired outline, may be clamped by nuts l2. suitable spacing means l3 being interposed between the model M and the surface of the rotatable table 3. Each of the slots above described is provided with an enlarged preferably square end portion |4 through which the heads ID of the bolts may be introduced and slid into the undercut slot.

The table 3 is fixedly secured, preferably by screw threaded connection l5 to the reduced end 1 portion of a shaft l6 having upper and lower tapered journals l1 and I8 which are mounted respectively in complementary tapered bearings I9 and 2|] in transverse members 2| and 22 of a suitable frame secured to and depending from the lower side of the model plate I. The transverse members 2| and 22 desirably are formed integral with vertical side frames 23 and 24 having flanged upper ends which are connected by suitable machine screws or bolts 25 to the under face of the model plate I. The vertical members 23 and 24 of the frame have secured to their lower ends below the transverse plate 22 horizontally extending supplemental frame members 26 and 21 the end portions 28 and 29 thereof being parallel to the inner faces of the frame members 2| and 22 and firmly clamped thereon by pairs of bolts 39 and 3|. The members 25 and 26 converge toward each other and are united by a preferably integral boss 32.

The supplemental frame provides means for supporting mechanism for rotatably adjusting the table 3 and also for supporting locking mechanism for holding the tablefixedly in any position of adjustment.

The mechanism for rotatably adjusting the table comprises a toothed sector 34 having an arm 35 provided with a boss 36 which is fixedly secured to the reduced lower end 31 of the shaft 5. The toothed sector 34 engages a worm 38 upon a shaft 39 which is journaled in suitable bearings in the boss 32 of the supplemental frame and in a suitable bearing in a boss 40 which is secured to or formed integral with the portion 29 of the supplemental frame.

The shaft 39 has fixedly secured to its end.

which projects beyond the boss 32, a knurled hand wheel 4| which desirably also is provided with a handle 42 to enable the shaft to be rotated rapidly if desired, while the knurled head 4| enables the operator to rotate the shaft slowly for the purpose of accurately adjusting the position of the table. Suitable stops desirably are provided for limiting the extent of rotatable adjustment of the table in either direction. As illustrated herein these stops comprise L- shaped plates 43 and 44 which are bolted to the under side of the transverse member 22 and are provided with downwardly extending flanges 45 having adjustable screws 46 mounted therein in such position that the ends of the screws may be adjustably positioned to engage and limit the movement of the sector arm 35.

Means are provided for indicating the extent of rotary adjustment of the table 3 in order that the'o-perator may accurately adjust the position of the model relatively to its normal position to modify the outline of the pattern in the manner above described. In the preferred construction illustrated a toothed sector 41, concentric with the axis of the shaft I6, is secured to the under face of the table 3 by suitable machine screws 48 which extend through radial slots in the sector 41. In order to provide for properly positioning the sector 41 concentric with'the periphery of the table 3, adjusting screws 49 and 59 are mounted respectively in brackets 5| and 52 with their ends engaging the inner face of the sector 41. Obviously, by loosening the screws 48 the adjusting screws 49 and 50 may be actuated to position the sector 41 accurately and the screws 48 then set up to hold the sector in its proper position.

The teeth of the sector 41 engage the teeth of a pinion 53 which is mounted upon a stud shaft 54 anchored in the model plate I. The pinion 53 has secured to its lower face an index arm 55 provided with an index 56 which extends upwardly through a slot in the model plate into cooperation with a suitable scale 51 which is carried by the upper side of the bed plate in such position that it can be readily observed by the operator. j I

Desirably means are provided for enabling different scales to be readily assembled upon the model plate. In the preferred construction illustrated the model plate is provided with an arcuate recess 58 .into'which scales 5'| corresponding in outline to the outline of the recess may be placed. For convenience: in making different adjustmentsin the production of different portions of the: pattern a readily removable supplemental scale 51a: may be superimposed upon the scale 51.

In order to secure the supplemental scale 51a: in place the scale 51 may be'provided with holes 58 adapted to receive complementary pins 60 projecting; downwardly from the scale 51m. The scale 51. desirably is provided with an arcuate slot through which the index 56 extends in cooperative relation to'the graduations of the posi tioned scale. By reason of this arrangement suitable adjustments of the rotatable table may be made to enable the outlines of portions of the patternito be modified from the outline which would :be produced from-the pattern without adjustment and which'will cause the outlines of the modified portions properly to merge with those produced before the model is angularly adjusted.

The scale plates are provided with scales the central graduation of which indicates the position in which the longitudinal axis of the model coincides with a diametrical line 6| on the table and plate which 'is in alinement with one of the straight line movements of one of the carriages of the pantograph or duplicating mechanism. Symmetrical graduations of the scale extend laterally from the central graduation toenable the table to be rotatedin opposite directions equal amounts to provide for modifications of right and left symmetrical sections of a pattern.

Suitable means are provided for locking the rotatable table in any adjusted position. In the particular construction illustrated herein a bar 62, which in effectis a lever, is secured by a bolt 63 ;tothe under side of the supplemental frame member 21 and is provided at its: opposite end with a boss. 64 through which the screw threaded end 65 vof the reduced end portion 37 of the shaft 26 extends. A nut 66 is adjustably mounted upon the screw threaded end 65 of the shaft and is held in adjusted position by a suitable lock 66w. A bell crank lever 68 is pivotally mounted upon the stud 61 projecting from the central portion of the bar 62 and the outer end of the lever 68 is provided with an offset handle portion 59 positioned to be readily grasped by the operator. The downward movement of the lever 68 desirably is limited by a strap 18 which is fixedly secured at its upper end to the bar 62 and at its l lower end has a U-shaped offset portion ll proa plate 18 which is fixedly secured to the under face of the table 3 and extends beyond the periphery thereof beneath the under face of the model plate I.

The connection between the bell crank lever 68and the link 13 produces a toggle which, when the lever 68 is swung to bring the axes of the pivots 61 of the bell crank lever into alinement with the pivots which connect the end of the bell crank lever to the link and the link to the lever M, swings the lever 14 upwardly and causes the cam face 11 of the lever 14 firmly to clamp the plate 18 against the under face of the model plate, and when the lever is swung downwardly to the position illustrated in dotted lines in Fig. 4 will relieve the clamping action of the lever 14 upon the plate 28. r

By reason of the fact that the fulcrum 61 of the lever 68 is rigid with the bar 62, the straightening movement of the toggle forces the bar 62 downwardly from the position indicated in dotted lines in Fig. 4 to the position illustrated in full lines, so that its connection to the reduced portion 65 of the shaft l6 pulls the shaft I6 downwardly thereby forcing the conical journal I! and H3 firmly into engagement with the complementary bearings I9 and 28 for the shaft, thereby binding the shaft in such manner as also to lock the table against rotation.

The following description of the grading of seamless vamps for shoes is typical of the operation of the machine and for clarity of description relative outlines of the master model are illustrated in full lines in normal position and in dotted lines in adjusted position in the right hand sections of Figs. '7 and 8, while the outline of the desired pattern produced by the adjusted'model is illustrated in full lines in the left hand sections of said figures with the dot and dash lines illustrating the outline which would have been produced from the model without the adjustment.

Certain shoe manufacturers desire to maintain the same throat opening for all sizes of seamless vamp patterns in order that the same die for ornamental pinking of the edges of the throat, or the production of ornamental lines of perforations inthe vamp may be employed for different sizes of shoes, thereby to avoid the necessity of purchasing different dies for each size.

The operation of the invention to produce this result is illustrated in Figs. 7 and 8 in which the pattern is illustrated in Fig. 7 in its normal position in full lines, and in its adjusted position in dotted lines, it being understood that the pattern is secured to the table with its longitudinal axis 19 in axial alinement with the axial line 6| of the machine, the center 88 of the model preferably being superimposed directly in alinement with theaxis of the shaft |6 which corresponds to the center of pantographic movement of the grading mechanism of the machine. The duplicating mechanism is so set as to produce a patern of the same size and shape as that of the model. The tracer of the grading mechanism is then caused to follow the upper end wall 8| of the throat of the model and the sides 82 and 83 for any size pattern which is to be graded. The scriber of the grading machine will then outline or cut a throat having an upper portion 8|, sides 82 and 83 identical with that of the model for any size of vamp.

The mechanism of the grading machine will i larger size is to be cut, as illustrated in Fig; 8 in full lines, the grading mechanism of the machine is set to produce such larger size pattern and the tracer of the machine is caused to follow the outline of the pattern from a point 84 around the toe portion to a point 85 somewhat below the transverse line which would pass through the ball portion of the 'vamp. -The model is then adjusted by rotating the table in a proper direction to such point as indicated upon the scale 58 as will designate the amount to be trimmed from the outer edge of the pattern to produce the desired width of the quarter or heel portion of the vamp. The tracer will then be caused to follow the line 86 of the model, thereby causing the scriber to outline the pattern along the full line 81, thereby reducing the width of the quarter or heel portion of the vamp from the position illustrated by the dot and dash line 88 which would have been followed if the tracer had followed the outline B6 of the pattern in full line positionillustrated in Fig. 7. When the line 81 is produced by the scriber it will merge into the outline at 84 without interrupting the continuity of the outline of the adjacent portions of the pattern. Ihe scriber is then caused to follow the end 89 of the model thereby causing the scriber to outline or cut the heel line 90 of the pattern.

By similar adjustment in the opposite direction an equal amount from the center line 6| as indicated by the scale graduations, the other-side of the pattern may be similarly graded to pro' duce the outline 9| for the quarter portion of the vamp and the heel line 92. By proper rotative adjustments, therefore, of the table, as indicated by a suitably graduated scale, the same width of the heel portion of the quarter may be maintained for all sizes of vamps. It will, however, be obvious that any width of the heel portion. of the vamp may be graded between that-which would be produced from the master model without adjustment of the model and that produced by suitable adjustment of the model according to the graduations of the scale.

In other instances it is desirable to modify the outline of the throat portion from that of the model by producing a wider or narrower separation of the edges of the quarters toward and at the heel part of the pattern. The manner in 661 which a wider throat opening is produced in a larger size than the model is illustrated in Figs. 9 and 10 of the drawings in which the normal position of the model is illustrated in Fig. 9 in full lines and one adjusted position in dotted lines.

In grading such larger pattern the scriber is first caused to follow the upper or wider end of the throat from the point 93 to 94 with the grading machine set on the model size. The scriber will then produce an exact duplicate from the points 93 to 94 upon the pattern. The model is then adjusted to the dotted line position shown in Fig. 9 and the tracer caused to follow the dotted line 95, thereby causing the scriber to outline or cut the pattern along the line 96.

The model may then be adjusted in the opposite direction in like manner according to the scale and the tracer caused to follow the opposite inner edge of the model, thereby causing the scriber to produce the outline or cut on the line 91 shown in Fig. 10.

The grading mechanism is then changed to produce the desired size of pattern. The tracer is then, caused to follow the toe portion of the model from the point 98 to the point 99 with the model set in its normal position in the manner above described. The model may then be adjusted angularly to produce the desired width of the heel portion of the vamp in the manner described with reference to Figs. '7 and 8.

While the mode of operation of the invention has been described with reference to reducing or trimming certain portions of a pattern for a seamless vamp, it will be understood that like variations from a model can be made upon any sort of. a pattern, and further that by reversing the adjustments of the pattern and the grading mechanism portions may be added to desired sections of a pattern.

Although the invention has been particularly described herein with reference to means for positioning a model of a duplicating machine, the same result may be obtained by providing a'rotatable support for the pattern blank with similar means for rotatably adjusting" the support about a fixed center of the pantograph mechanism complementary to the fixed center of the model as will be readily understood by those skilled in the art.

It will, therefore, be understood that the invention is adapted to general use in duplicating machines in which the pattern or design being produced is to be modified from the outline which would normally be produced from the pattern.

7 Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is:

1. Model positioning means for a machine of the pantograph type for proportionately duplicating the outline of a master model comprising means for supporting a master model in such normal position that by causing the tracer of the pantograph mechanism to follow a predetermined section of the outline of the model the scriber of the pantograph mechanism will outline a pattern sect-ion proportional to said section of the model, and means for adjusting the model angularly with relation to said normal position after a predetermined section of the model has been traced to cause the tracer when following an adjacent section of the outline of said model to move the scriber in a path which will vary the area of. the pattern from that which would be produced if the model were traced in its normal position, and which path will merge with the outline produced when the model is in its normal position without interrupting the continuity of the outline of said adjacent sections.

2. Model positioning means for a pattern grading machine of the pantograph type comprising a rotatable table having means for securing a model thereto in longitudinal axial coincidence with a diameter of said table, means for rotatably adjusting said table normally to position said diameter in parallelism with the straight line bodily movement of one of the carriages of the grading machineso that when the tracer of the grading machine is caused to follow a predetermined section of the outline of the model the scriber of the grading machine will outline a pattern section proportional to said section of the model, and means for rotatably adjusting said table relatively to its normal position after said predetermined section of the model has been traced to cause the tracer when following an adjacent section of the outline of said model to move the scriber in a path which will vary the dimensions of an adjacent section of the pattern without interrupting the continuity of the outline of. said adjacent sections.

:3. Model positioning means for a pattern grading machine of the pantograph type comprising a rotatable table having means for securing a model thereto in longitudinalaxial coincidence with the diameter of said tab-1e, means for rotatably adjusting said table normally to position said diameter in parallelism with the straight line bodily movement of one ofthe carriages of the grading machine so that when the tracer of the grading machine is caused to follow a predetermined sectionoi the outline of the model the scriber of the grading machine will outline a pattern section proportional to said section of the model, means for rotatably adjusting said table relatively to its normal position after said predetermined section of the modelhas been traced tocause said tracer when following an adjacent section of the outline of said model to move the scriber in a path which will vary the dimensions of an adjacent section of thepattern without interrupting the continuity of the outline of said adjacent section, and a cooperating index and scale operable by the table-adjusting means to indicate the amount of adjustment of. the model from normal position required to produce a pattern having predetermined variations from that which would be produced by tracing the normally positioned model.

4. Model positioning means for a pattern grading machine comprising a flat plate having a circular aperture therein, a circular flat table rotatably mounted in said aperture having means for securing the model thereto in longitudinal axial coincidence with the diameter of said table, means for rotatably adjusting said table normally to position said diameter in parallelism with the straight line bodily movement of one of the carriages of the grading machine so that when the tracer of the grading machine is caused to follow a predetermined section of the outline of. said model the scriber of the grading machine will outline a pattern section proportional to said section of the model, means for so rotatably adjusting the table relatively to its normal position that when the tracer is caused to follow an adjacent section of the outline of said model the scriber will modify the outline of the pattern without interrupting the continuity of the outline of said adjacent section, an arcuate scale mounted on said plate, and an index positioned to cooperate with said scale movable by said rotatable table in proportion to the graduation upon said scale.

5. Model positioning means for a pattern grading machine comprising a fiat plate having a circular aperture therein, a circular fiat table rotatably mounted in said aperture having means for securing the model thereto in longitudinal axial coincidence with the diameter of said table, means for rotatably adjusting said table normally to position said diameter in parallelism with the straight line bodily movement of one of the carriages of the grading machine so that when the tracer of the grading machine is caused to follow a predetermined section of the outline of said model the scriber of the grading machine will outline a pattern section proportional to said section of the model, means for so rotatably adjusting the table relatively to its normal position that when the tracer is caused to follow an adjacent section of the outline of said model the scriber will modify the outline of the pattern without interrupting the continuity of the outline of said adjacent section, an arcuate scale mounted on said plate, an index pivotally mounted on said plate, and intermeshing gears connected respectively to said index and to said table operable to transmit to said index a movement proportional to the rotation of said table.

6. Model positioning means for a pattern grading machine comprising a rotatable table having means for securing a model thereto in longitudinal axial coincidence with the diameter of said table, means for rotatably adjusting said table normally to position said diameter in parallelism with a straight line bodily movement of one of the carriages of the grading machine so that when the tracer of the grading machine is caused to follow a predetermined section of the outline of the model the scriber of the grading machine will outline a pattern section proportional to said section of the model, means for so rotatably adjusting said table relatively to its normal position that when the tracer is caused to follow an adjacent section of the outline of said model the scriber will modify the outline of the pattern without interrupting the continuity of the outline of said adjacent section, and means operable fixedly to clamp said table in normal or adjusted positions.

'7. Model positioning means for a pattern grading machine comprising a flat plate having a circular opening therein, a frame mounted upon and depending from said plate having a shaft in axial alinement with the center of said opening, a fiat circular table secured to said shaft substantially fitting the opening in said plate, means for securing a master model to said table with its longitudinal axis in parallelism with a diameter of said table, means for accurately ad justing said table normally to position said diameter in parallelism with a straight line bodily movement of one of the carriages of the grading machine or in angular relation thereto, a scale carried by said table, an index mounted on said table in cooperative relation to said scale, and means for transmitting the rotatable movement of said table to said index in a predetermined multiplied ratio.

8. Model positioning means for a pattern grading machine comprising a flat plate having a circular opening therein, a frame mounted upon and depending from said plate having a shaft in axial alinement with the center of said opening, a fiat circular table secured to said shaft substantially fitting the opening in said plate, means for securing a master model to said table with its longitudinal axis in parallelism with a diameter of said table, means for accurately adjusting said table normally to position said diameter in parallelism with a straight line bodily movement of one of the carriages of the grading machine or in angular relation thereto, comprising a worm gear sector fixedly secured to said shaft, and a manually operable shaft mounted in said frame having a Worm engaging said sector and having a wheel adapted to be conveniently grasped by the hand.

9. Model positioning means for a pattern grading machine comprising a flat plate having a circular opening therein, a frame mounted upon and depending from said plate having tapered hearings in axial alinement with the center of said opening, a shaft having complementary tapered sections mounted in said bearings, a fiat circular table secured to said shaft substantially fitting the opening in said plate, means for securing a master model to said table, means for rotatably adjusting said table, and means for moving said shaft axially in its bearing to clamp said table in any adjusted position.

10. Model positioning means for a pattern grading machine comprising a fiat plate having a circular opening therein, a frame mounted upon and depending from said plate having tapered bearings in axial alinement with the center of said opening, a shaft having complementary tapered sections mounted in said bearings, a flat circular table secured to said shaft substantially fitting the opening in said plate, means for securing a master model to said table, means for rotatably adjusting said table, means for looking said table in adjusted positions comprising means for clamping said table to said plate, and means for simultaneously moving the shaft axially to force the tapered sections of the shaftinto their respective bearings.

11. Model positioning means for a pattern grading machine comprising a fiat plate having a circular opening therein, a frame mounted upon and depending from said plate having tapered hearings in axial alinement with the center of said opening, a shaft having complementary tapered sections mounted in said bearings, a flat circular table secured to said shaft substantially fitting the opening in said plate, means for securing a master model to said table, means for rotatably adjusting said table, means for locking said table in adjusted positions comprising an extension underlying said plate, a lever pivotally mounted upon said plate having means to engage said extension, a lever pivotally mount ed upon said frame engaging the lower end of said shaft, and manually operable toggle mechanism operable simultaneously to cause said lever to clamp said table extension upon the plate and simultaneouslyto draw said shaft axially thereby to force the tapered sections of the shaft firmly into their respective bearings.

12. In a machine of the pantograph type for proportionately duplicating the outline of a master model comprising means for supporting a master model in such position that by causing the tracer of the pantograph mechanism to follow a predetermined section of the outline of the model the scriber of the pantograph mechanism will produce an outline of a pattern section upon a patternsheet proportional to said section of themodel, and means for relatively adjusting the model or ,a pattern sheet angularly about a pantographic center with relation to the a normal position thereof, that when the tracer is caused to follow an adjacent section of the outline of the model the scriber will be moved in a path upon the pattern sheet which will vary from that which it would follow if the model or pattern sheet were in their normal position but will merge with the outline produced when the model and pattern sheet are in their normal positions without interrupting the continuity of the outline of adjacent sections.

LEROY L. FAUNCE.

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