US2672110A - Pantograph mechanism - Google Patents

Description

March 16, 1954 K. E. CHRlSTOPHE RSON PANTOGRAPH MECHANISM Filed Aug. 18. 1950 March 16, 1954 'E. CHRISTOPHERSON FANTOCRAPH MECHANISM Filed AugQ 18, 1950 4 Sheets-Sheet 3 INVENT OR f ATTORNEKS March 1954 K. E. CHRISTOPHERSON 2,672,110

' PANTOGRAPH MECHANISM Filed Aug. 18, 1950 4 Sheets-Sheet 4 a zzmw w fi; W MWwWQ Q I W ,V

9 a VENTOR:

ATTORNEYS Patented Mar. 16, 1954 PANTOGRAPH MECHANISM Kenneth E. Christopherson,

Racine, Wis., as-

signor to George Gorton Machine 00., Racine, Wis., a corporation of Wisconsin Application August 18, 1950, Serial N 0. 180,225 20 Claims. (01. 112-102) The invention relates to pantograph mechanisms particularly adapted for the transmission of movements in scaled reproduction; and the nature and objects of the invention will be readily recognized and understood by those skilled in the arts to which the invention relates, from the following explanation and detailed description of the accompanying drawings illustrating what I at present believe to be a preferred embodiment or mechanical expression of the invention from among various other embodiments, expressions, designs, combinations and constructions, of which the invention is capable within the broad spirit and scope thereof as defined by the claims hereto appended.

More specifically, the invention is directed to and deals with pantographic movement transmitting mechanisms of the two-dimensional types in which the pantograph component of the mechanism is formed of pairs of parallel links or bars suitably pivotally connected together to provide a parallelogram form of movement transmitting linkage adapted to be pivotly mounted or hung for movements through a plane parallel with a Working surface, for transmitting and translating movements applied at one point of the parallelogram linkage from a tracer or style, as movements of another point on the linkage in scaled reproduction of the movements transmitted to the linkage. Such pantographic types of movement transmitting mechanisms are used extensively in various types of machines for numerous classes of work, in which it is desired to transmit movements of a tracer,-style or similar element, in scanning or tracing a pattern, template or master, to a work holder and a tool element for Working on a work piece, as relative movements between the work piece and tool element in precise and accurate reduced or enlarged scale reproduction of the movements of the tracer element.

With such pantographic movement transmitting mechanisms or linkages, provision is usually made for adjusting or setting the linkages to obtain different ratios of scaled reproduction between the movements of the tracer element and the relative movements between the work piece and tool element. However, adjustments of such a pantographic movement transmitting linkage generally require adjustments separately of several adjustment points on the linkage, and also require the adjustments at such points to be accurately and precisely coordinated with each other, in order to obtain the required precise setting for accurate operations at the desired ratio of reproduction. These separate adjustments are usually made manually and in sequence by the operator, with the final settings obtained from visual readings of a scale or other markings on the linkage. Any inaccuracies in the setting of the pantograph forming linkage result in inaccuracy of operation and false reproduction with the consequent losses due to imperfectly reproduced work pieces.

A primary object of my invention is to reduce the error potential inherent in such types of pantograph linkages where separate and in sequence adjustment of a plurality of adjustment points is required, by providing for accurate and precise,

complete adjustment of the pantograph linkage from a single adjustment point by a simple rectilinear, straight line movement of that point by the operator.

A further object is to provide a mechanically efficient and functionally accurate mechanism for effecting adjustments of a pantograph linkage from a single adjustment point. 7

Another object is to provide such a pantograph mechanism adapted for adjustment from a single point to selectively set the mechanism for different ratios of reproduction, which will be capa- Y ble of adaptation to and use with a variety of organizations for moving a tool element or a work holder in accurately scaled reproduction of the movements of a tracer element.

A further object is to improve the design, construction and mounting of a parallelogram form of pantograph mechanism.

And a further object is to provide a linkage system in association with a pantograph mechanism for transmitting therefrom the movements generated thereby in scaled reproduction, to a remote working point in 1:1 ratio.

With the foregoing general objects, and certain other objects, features and results in View which will be readily recognized from the following detailed description and explanation, my invention consists in certain novel features in design and construction, and in combinations and sub-combinations of parts and components, making up a mechanism of the invention, as will be more fully and particularly referred to in and specified hereinafter.

Referring to the accompanying drawings in which similar reference characters refer to corresponding parts throughout the several figures thereof:

Fig. 1 is a view in top plan of a pantograph mechanism of the parallelogram form embodying my invention and being shown with an associated linkage for transmitting to a remote point the movements in scaled reproduction imparted thereto by the pantograph.

Fig. 2 is a view in side elevation of the pantograph mechanism and associated linkage of Fig. 1, taken from the right-hand side when facing Fig. 1.

Fig. 3 is a view in rear elevation of the panto graph mechanism and associated linkage of Fig. 1.

Fig. 4 is a view in top plan of the pantograph unit of Fig. 1 in position adjusted to a different setting for a different predetermined ratio of reproduction from that for which the unit is set in Fig. 1.

Fig. 5 is a view in vertical longitudinal section taken as on the line 5-5 of Fig. 1.

Fig. 6 is a view in vertical longitudinal section taken as on the line 6-6 of Fig. 1.

Fig. 7 is a View in vertical section transversely of the tracer arm and through the tracer arm locking means, taken as on the line l-1 of Fig. 1.

Fig. 8 is a view in vertical section through the pattern table and table locking detent means, taken as on the line 8-8 of Fig. '1.

Fig. 9 is a view in vertical, longitudinal section through the long bar of the pantograph linkage, taken as on the line 9-9 of Fig. 1.

Fig. 10 is a top plan view of the short bar of the pantograph linkage showing the series of ratio adjustment notches therein with associated indicia thereon.

Fig. 11 is a top plan view of the long bar of the pantograph linkage showing the ratio adjustment notches and associated indicia thereof.

Fig. 12 is a detail view in top plan of the work holder and the stem and mounting bracket therefor removed from mounted position.

An embodiment of an adjustable pantograph mechanism and a linkage arrangement associated therewith for transmitting movements from the pantograph mechanism, has been selected and illustrated and described herein in a specific form and type adapted for transmitting in scaled reproduction the movements of a tracer to a work holder at a location remote from the basic pantograph organization, in order to move the work holder relative to a fixed tool element to cause the latter to reproduce on the work piece a pattern being scanned by a tracer. It so happens that in the selectedexample, the work holder is in a form to hold a piece of fabric, such as a handkerchief, and to move that fabric relative to a needle of a sewing machine, was to cause the needle to embroider, stitch or sew a design, such as an initial, on the fabric in precise but reduced scale reproduction of a pattern. This example embodiment and the particular use or work for which it was designed, is presented herein purely by way of example for purposes of illustrating and explaining the basic principles and features of my invention by which there is pro vided a pantograph mechanism of parallelogram linkage form which may be adjusted withprecision to a setting for a predetermined ratio of reproduction, from any one of a series of ratio settings, from a single adjustment point by a rectilinear adjustment movement in either direction along a straight line path. This basicpantograph organization may have its take-off point, that is, the point thereon that is moved in scaled reproduction to the movements imparted to the pantograph by a pattern scanning tracer, coupled and operatively connected with any desired element, component or mechanism, either a workpiece holder for movementrelative to a working tool element, or a working-tool element for movement relative to a workholder, or to any desired adaptable form of associated movement transmitting linkage mechanism such as exemplified in the example embodiment hereof.

The example embodiment of pantograph mechanism having associated therewith a movement transmitting linkage arrangement,'includes as a basic component an adjustable pantograph unit P of parallelogram form for movement transmitting operation by a tracer arm '1 carrying a tracer or style S movable over a pattern M mounted "on'a pattern table Hi. The arrangement of the linkage connected with the pantograph P,'is identified generally by the reference character L (seeFig. 1). The linkage L is operatively connected with the take-off point of the pantograph, that is, the point thereon that is moved in scaled reproduction of the movements of the style S, for transmitting from the panto graph P in 1:1 ratio to a-remotely located work holder, the'movements of such take-off point. The work holder F, inthis example, is in the form of a horizontally disposed fabric mounting and stretching frame operatively connected with linkage L for universal movements thereby through a horizontal plane. Aworking element ortool in the form of a vertically disposed needle N is positioned above work holder F for movements of that workholder relative to the needle. The needle N forms a part of and may be taken to exemplify any conventional or adaptable type or form of sewing machine, hence it is notconsidered necessary to illustrate herein such a sewing machine. Suffice it to state, that'the needle N is vertically reciprocated through a piece of fabric on the frame F as the frame is moved in a horizontal plane relative to the vertically reciprocal needle N by the pantograph P and linkage L, so that, the needle N is caused to sew, stitch or otherwise form'on a piece of fabric a precise replica in sealed reduction of the design of a pattern M on the'pattern table it.

The foregoing component organizations making up the example adaptation of the invention, and comprisingthe pantograph unit P, the linkages Land the sewing machine represented by the needle N, may be suitably mounted and arranged on a supporting structure which provides a horizontally disposed base or bed H above which there is mounted and supported in parallel, vertically spaced relation a horizontally disposed platform or work table l2. This work table l2 may be formed to provide a work machine locating area which may include a generallyrectangular opening l4 therethroug-h to provide a mounting location for-a sewing machine, with the portion of the platform or table structure 52 which surrounds opening i l providing amounting seat or attachment structure for the sewing machine.

The pattern table It is in the-form of a rectangular, platelike structure which i mounted and supported in horizontally disposed position on bed or base ll between that base and the platform table 12 thereabove, as will be clear by reference to Figs. 2 and 3 in particular. The pattern table if? is positioned parallel with bed H and table l2, and is mounted on the upper side of bed It for movements in either direction througha horizontal plane along a straight 1ine path.

A minimum'friction mounting arrangement for pattern table I0 is provided by whichthe pattern table is constrained precisely to its straightline path of movements in the horizontal plane parallel with bed II and worktable I2 thereabove. In this example, such minimum friction mounting of pattern table ID on bed II is effected by providing parallel channel structures or tracks I4 fixed to bed I I along opposite sides thereof, respectively. Parallel guide strips I5 are secured in fixed position on and along and depending from the under side of pattern table II]. Guides I5 extend down into and are slidably received in channels I4, respectively, for reciprocation longitudinally therethrough. Series of anti-friction balls I6- are engaged between. the adjacent side wall surfaces at opposite sides of channels I4 and guides I5 for rolling, minimum friction engagement therewith. Thus, pattern table Il may be moved or slid inwardly or outwardly relative to bed II and work table I2 with minimum friction and by the application thereto of light forces, while being constrained precisely to a straight line or rectilinear path of movement by the channels, guide strips and anti-friction ball assemblies.

Pantograph unit P has its primary point of support on base II and is pivotally mounted for swinging bodily in a horizontal plan about that point, The pattern table It forms the single adjustment point, that is to say the single adjustment member which the operator may grasp with on hand and by the application of relatively light forces thereto, slide inwardly or outwardly in the required direction to effect by such straight line movement the adjustment of the pantograph unit P to the required setting thereof to reproduce the movement of the tracer T at the desired ratio of reproduction.

Referring now to Figs. 2 and 4 in particular, the pantograph P is comprised of a, parallelogram formed of pivotly coupled links and bars disposed in a horizontal plane parallel with the pattern table It, work table I2 and the plane of movements of the work holder F. In this instance, the pantograph P includes a short bar 20 normally disposed generally transversely of pattern table II! and being pivotally coupled at one end to the adjacent end of a long bar 2| and at its opposite end to the adjacent end of a link 22 parallel with the long bar 2|. The short bar 20 is positioned disposed at the underside of bar 2I and link 22 but in a plane parallel therewith. The parallel long bar 2| and link 22 are disposed when in normal squared position of the pantograph, parallel with the straight line path of rectilinear movements in or out of the pattern table I0. The pantograph P is completed by a link 25 which is pivotally associated at its opposite ends with adjacent rear ends, respectively, of long bar 2| and link 22. This link 23 is connected and maintained in the organization in parallelism with the short bar 25 at the forward side of the unit P. Link 23'is positioned at and across the undersides of th adjacent end of long bar 2| and link 22 in a plane below but parallel with the planes of the latter members.

The primary pivotal support of the parallelogram linkage 262I22-23 of the pantograph unit P is effected through the medium of pivot block 50 (see Figs. 1 and 6) which is comprised by a body 5| having an open slideway 52 formed in and across its upper side into which the short bar -20 of the pantograph linkage is slidably received and confined. The body 5I of pivot block I 50 is formed with a circular bore 5Ia therethrough, centered with respect to the slideway 6, 52, and an annular, anti-friction bearing assembly 53 of the radial typ is mounted in such circular bore in axial alignment therewith.

A pivot shaft 56 having a reduced diameter upper end 54a and a reduced diameter lower end 541) is mounted with its upper end 54a journaled in the bearing assembly 53 of the pivot block 50. The pantograph unit P is mounted in position above the pattern table I0 and is primarily supported in this position for universal horizontal movements in a horizontal plane on and about the pivot shaft 54 which has support at its lower end in the base or bed II. The pattern tabl II], referring now to Figs. 1 and 6, is formed with an opening lea therethrough disposed transversely thereof, and being of a width to receive therein for free movement therealong the maximum external diameter body portion 540 of the pivot shaft 54. A pivot block guide plate 55 having a pivot shaft guide slot 55a therein of a width less than the width of opening Illa through pattern table I0 is secured in position on and flush with the upper side of pattern table I0, over the opening Illa, with the slot 55a of plate 55 opening into and aligned longitudinally withthe pattern table opening Illa. Guide slot 55a has a width less than the width of the pattern table opening Illa, and is formed to slidably receive therein and therethrough a guide key portion 55 formed on shaft 54 by opposite side, parallel flats 56a located between the reduced upper end of 54a and the maximum diameter body portion 540 of the shaft. This key portion 56 is formed of a width to have a free sliding fit in guide slot 55a.

A reproduction ratio finder plate 50 of generally rectangular form, is secured in fixed position on the upper side of base Il disposed in horizontal position below and with its upper surface in a plane parallel with the plane of hori- 7 wardly from the forward end of plate 60, outwardly toward the long bar 2|.

This ratio finder plate 55 provides the primary support for the pivot block shaft 54 which constitutes the pivotal mounting support for the pantograph unit P. The reduced diameter lower end 54b of pivot shaft 54 is slidably received in the guide or cam slot 6|, the external diameter of shaft end 541) being substantially equal to the width of the cam slot, so as to form therein a sliding fit without lost motion or play of the shaft laterally of the slot. The annular, horizontally disposed shoulder 54d formed between shaft body 540 and the reduced diameter lower end 54b provides a bearing and seating surface located in a horizontal plane perpendicular to the axis of the shaft for seating and slidable bearing engagement on the upper surface of plate 55 and thus supports shaft 54 and the pantograph unit P on and from base I I. Thus mounted and supported, the pantograph unit P is swingable as a unit through a horizontal plane about the axis of shaft 54.

The bars 20 and 2i and links 22 and 23, making up the pantograph unit P, are pivotly connected and joined together by minimum friction, pivotal mountings providing axes parallel with each other and perpendicular to the horizontal plane of the lateral swinging movements of the unit aboutshaft 54, for expansion and contraction of the linkage as it is universally laterally moved through the, horizontal plane about its pivot 54, in the general manner familiar in this art. In this instance, the short bar 28 is pivotally connected to link 22 by the pivot pin 22a fixed in link 22; short bar 29 is pivotly connected tolong bar 2I'- by the pivot pin 20a fixed in bar 2|; long bar '2'! is pivotly connected with link 23 by the pivot pin Zia fixed in bar 2! (see Fig. 5); and link 2-3 is pivotly connected to link 22 by the pivot pin 23a fixed in link 22. Each pivot pin 20a; Zia, 22a and 23a is journaled in an annular, anti-friction bearing unit 25 of the radial type mounted in that link or bar below the link or bar in which the respective pivot pin is fixed, as will beclear by reference to Figs. 5 and 6.

A slider block it is slidably mounted on and receives the long bar this slider block providing a take-off point thereon from which maybe transmitted the movements of the tracer styles which havebeen translated at the takeoff point as movements in sealed reproduction of the style movements.

ing formed in and across the underside thereof an open slideway '52 which siidabi'y receives and constrains therein the long bar 25 for movement of the block it longitudinally of the bar. The slide block i0 is mounted in position on the upper side of long bar 2! and is provided with a pin or stud 13 fixed at its lower end in the block. Stud 13'extends upwardly from block it with its vertical axis perpendicular to the horizontal plane of movements of the pantograph linkage and parallel with the pivotal axes of the bars and links of that linkage and with the pivotal support shaft 54. Stud 73 is positioned with its vertical axis lying in the vertical plane passing through the longitudinal center of slideway l This stud 13 provides the take-off point for the pantograph unit and it is movable with slider block 18 longitudinally along and relative to bar This slider block it, referring now to Fig. 5, comprises a body ll hav 2| to different positions of adjustmentthereon.

The position of the pivot block 5f! axially along the short bar 28 and the position of the slider block Hl axially of the long bar 2 I, will determine the ratio of reproduction, in this instance a scaled reduction, which will be generated at the stud 13 on slider block It, by movements of the pantograph imparted thereto at the axis of pivotal connection of the linkage provided by the pivot pin- 2211. which connects short bar it with the link 22'. In the present form of parallelogram linkage of the pantograph unit P, movement is imparted to the linkage by the tracer arm T which is formed as a longitudinal continuation of the link 22 to extend forwardly beyond short bar 29 to a position for movement of its outer end and of the tracer style S mounted therein,

over a pattern M onthe pattern table it. The

tracer style S is mounted in vertical position with its axis perpendicular to the plane of horizontal movements of pantograph unit P and to the horizontal lane of pattern table It and the upper surface of pattern M. Thus, style S is universally laterally movable with tracer arm T in scanning or tracing the design on the-upper surface of pattern M, and the movements of style S'are impartedby arm T to the unit P' for swinging that unit about pivot shaft 54 and contracting and expanding the parallelogram linkage to effect precise movements of stud 13 on block H1 in scaled reduction of the movements of style s.

While the pivot block 56 and the slider block are movable on bars 23 and 2! to infinite positions of adjustment thereof within the range of movements of the clocks, I have in the example adaptation to the particular uses for which unit is set up, provided for but five 5) adjustment settings for five (5) predetermined ratios of reduction. Referring now to Fig. 4 in particular, the shortbar Zilis provided along its outer longitudinal edge with five (5) V-shaped notches l, 2, 3, dand 5, therein. The long bar 2! is provided along its outer longitudinal edge with five (5) corresponding V-shaped notches I, 2, 3, i, and 5 therein. The notches on bar 2% determine the adjustment positions-for predetermined ratio settings, respectively, of the pivot block 50 on the bar, while the notches on bar 2-! determine the adjustment positions for predetermined ratio settings, respectively, for the slider block "it on that bar for the corresponding positions, respectively, of block 5!} on bar 28.

The pivot block at has mounted thereina spring loaded detent or latch pin M which is mounted in the block at the outer side of and disposed transversely relative to bar 20. Detent pin 5'? is continuously biased inwardly by an expansion spring unit 53 to slidahly engage at its inner end the outer edge of bar 28. The inner end of detent 571 is formed of a shape complementary to theshapeof the V-notches i, 2, 3, 4, and 5, for releasable locking engagementin any one of such notches upon movement of block as to a position aligning the detent with a selected notch.

The slider block it has mounted therein a spring loaded detent or latch pin '55. This detent is mounted in block id at the outer side thereof in horizontal position disposed transversely relative to bar 25, and is continuously biased inwardly by'an expansion spring unit it, so as to 'slidahly engage at its inherend the outer longitudinaledge of bar 2!. The inner end of detent Z5 is formed of a shapecomplementary to the shape of the V-notohes i, 2, 3, 4" and 5', for releasable locking engagement in any one of such notchs upon movement of the slider block liltoa-position aligning the detent with a selected notch.

Suitable index lines 6 are formed transversely across the upper side of bar 23 adjacent but spaced from the notches I, 2, 3, i and 5, respectively.

Each index line ispositioned to lie adjacent and" visible at-atransverse edge of block at when the detent pin 51 of the block isengaged in the notch of that index line. Reduction ratio indicia are provided adjacent to index lines it, respectively, to visually indicate the ratio of reduction at which the pantograph is. set when the block 58 is positioned on bar it with its detent 5'5 engaged in the corresponding notch for that ratio. In this instance, the .ratios' of reduction represented by the:notches..l.,.2,;3, G and 5, are "1/4, fl/3, 1/2, 3/42 and "1, respectively. A similararrangement of index lines 6' and ratio indicating indicia, is provided on the upper side of long bar 21, the ratios of reduction represented by the notches I, '2, 3, it and a, being 1/4, 1/3, 1/2, 3 4 and respectively. (See Figures 10 and 11.)

Following the teachings of my invention, as ex pressed in the particular mechanical adaptation thereof ofthe illustrated example, I provide for complete. precision adjustment of the pantograph unit P'by simple, straight line movements of the pattern table ID in either direction inwardly or outwardly relative to the pantograph unit P and to the bed II and Work table l2 between which his mounted. The pattern table It thus functionsas a single, manually operable member or element which the operator may grasp and move in the proper direction until the pivot block 5!) and the slider block it are moved along bars 29 and 2|, respectively, to positions in which the block detents snap into the desired set of locking notches for setting the pantograph for the predetermined reduction ratio desired by the operator. It will be clear from the description hereinbefore set forth, that if the parallelogram linkage of pantograph unit P is squared to the position shown in Fig. 1 and slider block 10 is constrained against movement then inward movements applied to tracer arm T will bodily move the linkage with its supporting pivot shaft 54. Such movement will cause the long bar 2! to slide through slider block it, while the pivot shaft 54 will be guided and cammed by slot 6| of plate 60 along the angular path of the slot in a direction toward long bar 2| to thereby cause pivot block 53 to slide along the short bar 29.

The pattern table l which provides the single, manually operable adjustment member for applying the inwardly or outwardly acting forces to tracer arm T and the pantograph linkage P must be capable of operative connection with tracer arm T. To this end I provide for releasably looking and securing tracer arm T when in the squared relation of Fig. 1, to the pattern board ill, so that movements of the latter in either direction along a straight line path are directly imparted to the tracer arm it. Referring now to Fig. '2, a socket forming sleeve or bushing 88 is mounted in vertically disposed position in a bore 80a formed vertically through pattern table It. Sleeve 80 is located in board It in position with its vertical axis perpendicular to and intersecting a line passing through the longitudinal center of tracer arm T when that arm and the pantograph linkage are in the squared relation shown in Fig. 1. A locking pin 81 is reciprocally mounted in vertically disposed position in a vertical bore 8| a formed in tracer arm T. Pin 8! is movable downwardly to projected locking position depending from tracer arm T and upwardly from looking position to retracted, inactive position drawn up into bore 81a. When the pantograph linkage is in squared relation, the tracer arm T is positioned with the locking pin 8! thereof located above and in vertical axial alignment with the socket formed by sleeve or bushing 80. If then locking pin 8| is projected downwardly into the socket o-f bushing 30, the tracer arm T and pantograph unit P are locked against movements thereof laterally in the horizontal plane. But the tracer arm T is then operatively coupled with pattern board Ill for movements as a unit with that board along its straight line path of movement inwardly or outwardly relative to unit P.

Manual operating means is provided for actuating locking pin 3| to and from projected locking position and retracted inactive position. In this instance, such means is formed by a lock control shaft 82 journaled in tracer arm T in position transversely thereof with its axis perpendicular to and intersecting the vertical aXis of pin i. At its inner end shaft 82 is provided with an eccentrically mounted, crank forming pin 83 which extends therefrom into operative engagement in a slot 84, milled or otherwise formed, across one side of locking pin 8| adjacent the upper end of the pin, as will be clear by reference to Fig. 7. The outer end of the lock control shaft 82 is suitably knurled for grasping between the fingers of an operator to rotate the shaft to actuate pin 8| to and from its projected, locking position and its locking retracted, inactive position.

Suitable means is provided for locking the stud l3 and slider block Ill against lateral or horizontal movements when the pantograph linkage is in its squared relation of Fig. 1. In the example embodiment, referring now to Fig. 5, the stud 13 projects upwardly a distance from block 10 to thus form a locking pin portion 11 which termi-i nates at its upper end adjacent to but spaced from the underside of the work table I2. A cylindrical plug member is slidably mounted in vertically disposed position in a suitable mounting structure work table I! for vertical reciprocation to and from a projected position depending below the table and a retracted position drawn upwardly into the table mounting structure. This plug member is provided with a socket 9i opening through the lower end thereof for alignment therewith of the stud i3 of lock 70 when the pantograph linkage is in its squared relation. With stud l3 and plug socket 9| vertically axially aligned, the plug member 99 may then be projected downwardly to locking position with the upper end of pin l! of stud i3 seated and received in socket 8!. In this locking position of member 90 the stud l3, and hence block 10 to which it is mounted, are held locked against movements laterally relative to the table.

A manually operable control shaft 92 is journaled in and extends through table [2 in a horizontally disposed position with its axis perpendicular to and intersecting the axis of plug member 90. Control shaft 92 extends forwardly of the table and has its forward end accessible at the forward edge of table 12. The projected forward end of shaft 92 may be suitably knurled for ready grasping thereof between the fingers of an operator for rotating the shaft in either direction. At its inner end shaft 92- is formed with an inwardly projecting eccentrically mounted crank forming pin 93 for operative engagement in a slot milled or otherwise suitably formed across one side of plug 98 adjacent the upper end of the plug. Thus, by rotating shaft 92 in one direction plug 9|] is projected downwardly to locking position over and receiving into socket 9! thereof the upper end of locking pin 1! of stud l3. Rotation in the opposite direction of shaft 92, will retract and raise plug 9;] to position with pin 11 clear of socket 9! to thereby release stud 11 and slider block in for normal movement transmitting operations of the pantograph unit P.

As the pattern table it constitutes and forms the single manually operable member for adjusting the pantograph unit P to a selected, predetermined ratio setting, and as it is advisable to releasably lock the pantograph unit in a setting thereof to which adjusted, I have provided a mechanically simple and functionally eflicient arrangement for this purpose. Referring now to Fig. 8, in connection with Figs. 1 and 4, a pattern board lock plate 31] is secured in position along one longitudinal side edge, in this instance the right hand side edge, of pattern board ID. This lock plate 38 is provided with a series of five (5) notches extending vertically through the plate and opening through the outer vertical side thereof. These notches are identified herein as 31, 32,

33, 34 and 35, and they correspond tothe setsof ratio determining notches i--i 22',, 3-3, 4- -5 and 5-5, respectively, provided on the bars and 2| of the pantograph linkage. Adetent or locking pin is reciprocally mounted in horizontally disposed position in a bracket member 3'! which is attached in fixed position on the bed or base H, with the lock pin 36 positioned thereby with its inner end in sliding engagement with the outer edge surface of the locking plate. Locking pin 36 is continuously biased. inwardly by an ex pansion spring unit 38, so that when pattern table is moved to a position either inwardly or outwardly in which a locking notch is aligned with the pin 36, the pin is snapped into the notch to thereby releasably secure the table in such position against displacement. The pin 35 extends outwardly a distance beyond the outer side of bracket 31, and is suitably knurled for fmger grasping to withdraw the pin axially outwardly against spring unit 38, and thus retract the pin from locking position in a locking notch of the locking bar and thereby permit of ready movement of table It by the operator to another position of adjustment.

The notches 31,32, 33, 34 and 350i the locking plate are so located relative to the plate and to each other, that when the pantograph unit is in the setting represented by notches l--l', of

bars 26 and 2!, locking pin 36 is in look plate notch 31; when the unit isin the setting represented by notches 2-2', pin fat is in notch as; when in the setting represented by notches 3-3, pin 36 is in notch 33; when in the setting represented by notches 4- 1, pin 36 is in notch 34; and when in the setting represented by notches 5-5., pin 36 is in notch '35.

Operation-Pantograph unit With the example embodiment as hereinbefore described, when it is desired to adjust the pantograph unit P to any one of the five (5) predetermined reduction ratio settings provided for in the example, the operator will first move the pantograph unit and the pattern table 19 to its basic squared position of Fig. 1. In this position he will have lined-up locking pin 8! of the locking mechanism mounted on tracer arm T, with the locking sleeve to in the pattern board 10 therebelow, and will have also axially lined-up the socket 91 of the plug member 98 with the upwardly extending locking pins 11 of stud E3 of the slider block it. Such positions of the tracer mounted locking mechanism and the locking mechanism for the slider block 70 are shown by Figs. 5 and '7 of the drawings. In this position of pattern table It and pantograph unit P, the pattern table is at its limit of outward movement relative to base I l and table 52, with the pattern board locking pin 36 releasably engaged in the innermost locking notch of lock plate 30, so that, the pattern table is releasably secured in such position of adjustment.

In the squared position of pantograph unit P, as shown in Fig. 1, the pivot block 50 is in position with its detent pin 51 releasably engaged in notch 5 of short bar as, and with the lower end 541) of pivot'shaft 54 in position at the forward end of the guide or cam slot 51 of the ratio finder plate lit. The slider block 10 for this squared position of the pantograph, is located on long bar 2! at the inner or rear end of that bar with its detent pin 15 releasably engaged in notch 5, and with stud '13 in vertical, axial alignment with and above the pivot pin 2 to which piv- 12 otally joins the adjacent ends of link 23 and lon bar 2!.

After squaring-up the pantograph in the position above described, the operator may then rotate the control shaft 82 of the tracer arm locking mechanism in a direction to project locking pin 8! downwardly into position received and engaged in looking sleeve to to thus firmly releasably lock tracer arm T against lateral movements. Next, the operator may by rotating control shaft 92 of the slider block lock mechanism, in the proper direction, project the plug member which is mounted on table l2, downwardly into position over and with the stud 13 received and firmly engaged in socket 8| of the plug member, so as to thereby lock slider block ID with its stud '13 in a fixed position against lateral movements. In this manner, pantograph unit P with its operating tracer arm T are held in truly squared position against lateral movements in any direction, except along the straight line path of movement of the pattern board It, while the slider block it is releasably looked against any lateral movements whatsoever, but with long bar 2| slidable longitudinally therethrough along a straight line path parallel with the path of straight line movement of pattern table Ill.

The pantograph unit P from this position squared and locked for adjustment, may then be adjusted by the operator with precision by a simple inward, straight line movement of the pattern table It, without any requirement for guidance or measurement by the operator. Let it be assumed that the operator wishes to set the pantograph unit to reproduce movements of the tracer style S at the take-oil point provided by stud l3 as movements reduced one-half of the style movements. To efieot the necessary adjustment the operator merely withdraws spring loaded, pattern board locking pin 36 outwardly clear of locking notch 35, and then pushes pattern board it inwardly to move it into position with pattern board locking notch 33 aligned with pin whereupon he releases the pin which then snaps into locking position in notch 33 of the lock plate 30. As a result of the bodily inward movement inwardly along a straight line path parallel to the path of movement of the pattern board, and as the pivot block 5!! is constrained by the key portion of pivot 54 formed by flats 55a sliding in the slot 55a in guide plate 55, to straight line movements transverse of the path of pattern table movement and longitudinally of the bar 25 the pivot block 55 will have been cammed by guide or cam slot (it of plate Bil in a direction along bar 20 to the left until detent pin 5'6 snaps into locking notch 3 of short bar 20. The same inward movement of pattern board It! will have simultaneously moved pantograph unit P inwardly and with slider block it locked against movement, the long bar 2! will have been moved inwardly through the block it to a position in which the detent pin 15 of that block will have snapped into locking position in the locking notch 3 of long bar 2!. In other words the pantograph unit P will have been moved bodily rearwardly with the pattern table ill while being maintained square, so that, the unit P will have been moved inwardly relative to base I I thereloelowv and the work table l2 thereabove.

After the pantograph unit P is moved to the adjusted position for the desired required setting of pivot 54 relative to bar 26 and stud 53 relative to bar 2% for the desired ratio of reduction, the operator unlocks the tracer arm T by rotating 'jacent lefthand side of the work table I2.

shaft 82 to raise locking pin H from sleeve'80,

-member 90 to position disengaged from the stud 13. The pantograph may then be operated in the usual manner by universally laterally swinging tracer arm T to scan or follow a design on the pattern M with the tracer style S. Such movements of the tracer style S will then be imparted by the tracer arm to the parallelogram linkage and, due to the setting thereof with pivot block 50 locked in notch 3 of bar 20 and slider block I locked in notch 3' of bar 2I, will result in movements of stud 13 in precise scaled reduction of the movements of tracer style S over the pattern.

. The operation of adjusting the pantograph unit P for any selected one of the other predetermined ratios of reproduction within the range provided for by the example embodiment, may be effected in identically the same manner as hereinabove described for adjusting to the setting for the onehalf /2) ratio reduction.

By the utilization of the pattern table I0 as the single adjustment member for manual operation to selectively adjust the pantograph unit P for a desired setting, and by locking tracer arm T to table It) for operation therewith, the proper relationship between the tracer arm T and style S and the pattern M on the board is insured and maintained during adjustment operations. However, if desired or found expedient, an element separate from the pattern table may be provided as the manually operable member for effecting straight line adjusting movements of the pantograph unit.

The associated linkage In the particular adaptation of an adjustable pantograph organization of my invention as presented herein by way of example, it is desirable to transmit'in 1:1 ratio the movements in sealed reduction of the take-off point constituted by the stud 1'3 of the slider block of the pantograph,

to the work holder F which is'located in position spaced above and to the rear of the pantograph for movements in a horizontal plane parallel with the plane of movements of the pantograph. I have devised a suitable linkage L, for comiection and association with the pantograph unit P for so transmitting movements to the work holder.

In the illustrated form such linkage L includes a supporting block I00 secured to the base II at the rear lefthand portion thereof when facing Fig. 1. Supporting block I00 extends vertically upwardly from base II beneath work table I2, and a pair of parallel bars or links It! and E02 are pivotall connected at their rear ends by pivots IBM and mm, with the upper side of supporting block I in positions extending horizontally forwardly and outwardly in a direction away from the pantograph unit P and toward" the ad;

A their forward ends these parallel links IfiI and I02 are pivotally connected by pivots Hill) and I 02b to one leg I 04 of a bell crank lever I 03 which is mounted in horizontally disposed position. Thus, the links I0! and IE2, bell crank leg I 04 and supporting block 00 form a single parallelogram linkage.

The link IOI is also pivotally connected at its forward end to the outer horizontally disposed beam I00 which is located generally transversely of links HM and I512 and which terminates at its inner end adjacent but spaced to the rear of the outer end of pantograph link 23. Abeam I01,

similar to beam I06 is positioned generally parallel with but spaced forwardly from beam I 06 and is pivotally mounted or swiveled at its inner end on stud 13 of slider block 10 of the pantograph unit P. (See Fig. 5.) The outer end of beam I0! is pivotally coupled to the other leg I05 of the bell crank I04 by a pivot Iilla, this bell crank being positioned with leg I04 generally parallel with beams I96 and IIl'l and with leg I05 thereof transverse to such beams. In this arrangement, as will be clear from Fig. l, beam I 07 with the pantograph unit P in its basic squared position, has its longitudinal center lying in the same vertical plane as the longitudinal center of link 23 of the pantograph unit.

An L-shaped bracket member I 98 provides a long arm I09 and a short arm I Ill. The forward end of short arm N0 of bracket I03 is pivotally mounted or swiveled on stud I3 of slider block 10 of the pantograph unit in position above the end of beam Nil which is also mounted on stud 53. This short arm extends rearwardly from stud 73 generally transverse to beams Hit and I01, and at its rear end or junction with the inner end of long arm N39, has pivotally coupled thereto by pivot I I0a the inner end of beam M6.

The long arm I09 of the L-shaped bracket member I08 extends outwardly in general parallelism with link 23 of pantograph unit P when the latter is in the squared position of Fig. 1, and includes at its outer, free end an integral, upstandin split flange member Iilfia. A shaft III is secured firmly at one end in the split flange member I09 and extends vertically upwardly therefrom (see Fig. 3). The upper end of shaft I ll mounts an adjustable bracket member II2 which extends horizontally inwardly therefrom. The work holder F in the form of the fabric mounting and stretching frame of this example, includes a stem or fixture H4 extending radially therefrom in the plan thereof. The work holder frame F is mounted in horizontally disposed position by releasably securing the stem H4 thereof to the bracket member H2 mounted and carried on shaft I I I, as will be clear by reference to Fig. 3' of the drawings. The work table I2 is formed with an opening [2a therethroug-h above and around the free end of long arm I09 of bracket I08, through which opening shaft III extends to the upper side of thetable. Opening I 2a, is of sufiicient area to permit of the full range of movements of shaft I II by the bracket member in the operation of the linkage L by the pantograph unit.

The work holder frame F is positioned by its stem IM and the bracket H2 on shaft III, to lie below the needle N of a sewing machine (not shown) mounted in the angularly disposed position as indicated by the opening I4 in table I2. This work holder frame F is in position for universal lateral movement beneath and across needle N for sewing or embroidering operations as will be readily understood by those familiar with such art.

Thus, it will be apparent that the linkage L connected as described, with the take-01f point constituted by the stud is of slider block 10 of the pantograph unit P will be actuated by the reduced scale movements of stud E3 to transmit such movements in 1 :1 ratio to the work holder frame F to move that holder in a horizontal plane beneath and across needle N. In this manner, the reduced scale movements of stud 13 are transmitted to the remotely located work holder '15 above but parallel with the plane of the movements or the parallelogram linkag of the pantograph and with the plane of the pattern M traced by lateral movements of the style S carried by thetracer arm T.

The adjustable pantograph mechanism of my present invention has been disclosed in operative connection with the associated linkage L of a specific form for operating the fabric mounting Work holder F, primarily for the purpose of giving an illustration of a mechanism which can be operated from the take-off point of the pantograph. However, it is not intended by the illus trated example to limit the use of the pantograph mechanism to association with any par ticular mechanism or organization to be actuated therefrom, as the adjustable pantograph mechanism of the invention is intended for use in any association or for any purpose for which it may be adapted.

It is also evident that various modifications, substitutions, eliminations and additions may be resorted to without departing from the broad spirit and scope of my invention, and hence, I

do not desire or intend to limit the invention in i all respects to the exact disclosures of the specific example thereof herein presented, except as may be required by specific, intended limitations thereto in certain of the claims hereto appended.

What I claim is:

1. In combination, a pantograpnic movement transmitting mechanism including, a parallelogramlinkage comprised of pairs of parallel links pivotally coupled together; a pivot block slidably mounted on one of the links of one of said pairs for movement in either direction longitudinally along such link to adjusted positions thereon; a slider block slidably mounted on one of the links of the other of said pairs of links for movement of such link longitudinally in either direction relative to said slider block to adjust the position of said block on the link; means for setting and releasably locking said linkage in squared position; means for releasably locking said slider block against movement; means for moving said i linkage bodily when locked in squared position in either direction along a straight line path parallel with the longitudinal axis of the link on which said slider block is mounted; and means for forcing and guiding said pivot block longitudinally along the link on which mounted to adjusted positions during movements bodily of said linkage.

2. In combination, a pantographic movement transmitting mechanism including, a parallelogram linkage comprised of pivotally connected i.

links; a pivot block slidably mounted on one of the link of said linkage for movements in either direction longitudinally of such link to adjusted positions thereon; a slider block mounted on another link of said linkage for movements of such link ineither direction longitudinally relative to said slider block to adjust the position of the block on the link; means for releasably locking said linkage in squared position; means for releasably locking said slider block against movement; means for moving linkage bodily in either direction along and constrained to a straight line path parallel with the longitudinal axis of the link on which said slider block is mounted when the linkage is locked in squared position; means for forcing and guiding said pivot block along the link on which mounted to adjusted positions thereon by movements bodily of said. linkage; and a manually operable membenconnected with said linkage moving means-for ill 16 effecting actuation of such means to move the linkage bodily in either direction along said straight line path to adjust simultaneously the setting of said pivot block and slider block relative to said linkage.

3. In the combination defined by claim 2, the link on which said pivot block is slidably mounted being provided with adjustment positioning notches therein and said slider block being provided with a spring loaded detent for releasable locking engagement in any one of said notches; and the link on which said slider block is mounted being formed with adjustment position notches therein corresponding to the notches, respective ly, in said first mentioned link, and said slider block being provided with a spring loaded detent for releasable locking engagement in any one of said notches of said link on, which mounted.

4. In combination, a support structure; a pivot member movably mounted on said support structure; a pantographic movement transmitting mechanism including a parallelogram linkage; a pivot block slidably mounted on one of the links of said linkage for movement in either direction longitudinally therealong, said pivot block being pivotally mounted on said pivot member with said linkage supported therefrom in position disposed in a plane perpendicular to the axis of the pivot member; a slider block slidably mounted on another link of said linkage for movements in either direction longitudinally along such link to adjusted positions thereon; means for releasably locking said linkage in squared position; means for releasably locking said slider block against movement; means for moving said linkage bodily in either direction along a straight line path parallel with the longitudinal axis of the link on which said slider block is mounted when said linkage is locked in squared position and said slider block is locked against movement; and means for forcing and guiding said pivot block to move longitudinally along the link on which mounted and simultaneously with relative movements between said slider block and the link on which said block is mounted during movements bodily of said linkage to an adjusted position relative to said pivot block and said slider block.

5. In combination, a support structure; a pivot member mounted on said support structure in position with its axis perpendicular to the plane of said structure, said pivot member being mounted on said structure for movements laterally relative to the structure; a pantographic movement transmitting mechanism including a parallelogram linkage; one of the links or" said linkage being pivotally mounted on said pivot member with the linkage supported therefrom in position for swinging movements in a plane perpendicular to the axis of said pivot member, said pivot member being mounted for movements laterally in either direction longitudinally along and relative to the link with which coupled; a take-off member mounted on another link of said linkage for movements in either direction longitudinally therealong to adjusted positions thereon; means for releasably locking said linkage in squared position; means for releasably locking said take-off member against movement; means for moving said linkage bodily in a plane perpendicular to the axis of said pivot member in either direction along a straight line path parallel to the longitudinal axis of the link on which said take-oil member is mounted when the linkage is locked in squared position; and means for forcing and guiding said pivot member longitudinally along the link of said linkage on which mounted during movements bodily of said linkage in either direction along its straight line path.

6. In combination, a pantographio movement transmitting mechanism including, a parallelogram linkage; a pivot block slidably mounted on one of the links of said linkage for movements in either direction longitudinally of such link to adjusted positions thereon; a slider block mounted on another link of said linkage and being movable in either direction longitudinally of said link to adjusted positions relative thereto; means for releasably locking said linkage in squared position; means for releasably locking said slider block against movement while permitting movements of the link on which said block is mounted; a pattern board mounted in position in a plane parallel with the plane of movements of said linkage, said pattern board being mounted for and constrained to movements along a straight line path parallel with the longitudinal axis of the link on which said slider block is mounted when said linkage is in squared position; and means for releasably coupling said pattern board to said linkage for movement bodily of the linkage along said straight line path of movements of the pattern board.

7. In the combination defined in claim 6, the link on which said pivot block is mounted being formed with a series of spaced positioning notches therein and said pivot block being provided with a spring loaded detent for releasable locking engagement in any one of said notches; the link on which said slider block is mounted being provided with a series of spaced positioning notches therein corresponding to the positioning notches, respectively, on said first mentioned link; said pattern board being provided with a locking plate thereon having a series of positioning notches therein corresponding to the notches, respectively, of the series of notches on the aforesaid links; and a spring loaded locking pin being mounted for releasable locking engagement in any one of said locking plate notches.

8. In combination, a pantographic movement transmitting mechanism including, a parallelogram linkage; a pivot member; a pivot block pivotally mounted on said pivotmember and slidably receiving one link of said linkage for supporting said linkage for swinging movements in a plane perpendicular to the axis of said pivot member; said pivot member being movable in either direction longitudinally along said link to adjusted positions; a slider block slidably mounted on another link of said linkage withsaid link being slidable through said block in either direction longitudinally of the link to adjusted positions; means for releasably locking said linkage in squared position; means for releasably locking said slider block against movement with the link on which said block is mounted being freely slidable through the block; a pattern board mounted in position in a plane parallel with the plane of movements of said linkage about said pivot member; said pattern board being mounted for and constrained to movements along a straight line path parallel with the longitudinal axis of the link on which said slider block is mounted when said linkage is in squared position; a tracer arm forming an axial continuation of that link of said linkage which is parallel with they link on which said slider block is mounted;

said tracer armbeing extended over said pattern board; and means for releasably coupling said pattern board to said tracer arm for effecting bodily movements of said linkage when in squared position by movements of said pattern board along its straight line path of movement.

9. In combination, a pantograph linkage; a pivot member; one link of said linkage being pivotally mounted on said pivot member with the linkage supported therefrom for movements in a plane perpendicular to the axis of said pivot member; a tracer arm connected with said linkage; a pattern board mounted for movements in either direction along a straight line path; and means for releasably coupling said pattern board to said tracer arm for efiecting movements bodily of said linkage in either direction along the straight line path of movement of said pattern board.

10. In combination, a pantograph linkage comprised of pivotally coupled links; a support structure; a pivot member mounted on said support structure and being movable laterally thereon; one link of said linkage being pivotally mounted on said pivot member with the linkage supported therefrom for movements in a plane perpendicular to the axis of said pivot member; a tracer arm connected with said linkage; a pattern table mounted on said support structure in position in a plane parallel with the plane of movements of said linkage and being movable on said support structure in either direction along a straight line path; and means for releasably coupling said pattern table to said tracer arm for effecting movements laterally of said pivot member and movements bodily of said linkage in either direction along the straight line path of movement of said pattern table.

11. In combination, a pantograph linkage; a support structure; a pivot member on said support structure; one link of said linkage being pivotally mounted on said pivot member in position supported therefrom for swinging of the linkage about said pivot member in a plane for perpendicular to the axis of the member; said pivot member being mounted on said support structure for movements laterally; a pattern board mounted in position in a plane parallel with the plane of swinging movements of said linkage about the pivot member, said pattern board being mounted for and constrained to movements in either direction along a straight line path perpendicular to the longitudinal axis of the link pivotally mounted on said pivot member when said linkage is in squared position; a tracer arm connected with said linkage and being extended over said pattern board; and means for releasably locking said tracer arm to said pattern board with the linkage in squared position.

12. In combination, a pantograph linkage comprised of pivotally coupled links; a support structure; a pivot member on said support structure mounted for movements laterally thereon; one link of said linkage being pivotally mounted on said pivot member with the linkage supported therefrom for swinging about said member in a plane perpendicular to the axis of the member; a pattern table mounted on said support structure for movements to adjusted positions in either direction along a straight line path in a plane parallel with the plane of movements of said linkage and perpendicular to the longitudinal axis of the link pivotally mounted on said pivot member when said linkage is squared; means for releasably locking said linkage to said pattern table with the linkage in squared position for movements bodily of the linkage and said pivot member by movements to adjusted positions in either direction of said pattern table; and means on said support structure for forcing and guiding said pivot member longitudinally to adjusted positions along the link of said linkage which is pivotally mounted on said pivot member as said linkage is moved bodily in either direction by movements of said pattern table along its straight line path of movement.

13. In combination, a pantograph linkage comprised of pivotally coupled links; a support structure; a pivot member on said support structure mounted for movements laterally thereon; one link of said linkage being pivotally mounted. on said pivot member with the linkage supported therefrom for swinging about said member in a plane perpendicular to the axis of the member; a pattern table mounted on said support structure between said pantograph linkage and said structure for movements to adjusted positions in either direction along a straight line path in a plane parallel to the plane of movements of said linkage about said pivot member; said pattern table having a slot therethrough disposed transversely of and perpendicular to the path of straight line movements of the table; pivot member being extended through and slidably received in said table slot; means for releasably locking said linkage to said pattern table when the linkage is in squared position for eiifec""ug movements bodily of the linkage and p o; member by straight line movements in direction of said pat ern table; and means on support structure operatively with said pivot member for forcing said member laterally along a predetermined path to move said pivot member in either direction longitudinally of the link to which coupled by movements in eithe; rec-tion of said pattern table along its straight line path.

i i. In combination, a pantograph linkage comprised of pivotally coupled links; a. support struchire; a pivot member on support structure mounted for movements laterally thereon; one link of said lin rage being pivotally mounted on said pivot member with the supported therefrom for swinging about d member in a plane perpendicular to the axis of the said link being mounted. on said pivot member for movements of the member in either direction. longitudinally along the link to adjusted positions thereon; a slider block slidably mounted on another link of said linkage for-movements of said link longitudinally relative to said block to adjusted positions; means for releasably locking said linkage in squared position; means for releasably locking said slider block against move-- ment; means for moving said linkage bodily when in squared position along a straight line path parallel with the longitudinal of the link on which said slider block is mounted to move said link to adjusted positions relative to the block; and means operatively connected with said pivot member for moving member longitudinally along the link to which mounted to adjusted positions thereon by movements bodily of said linkage when the linkage is in squared position.

15. In combination, a pantograph linkage comprised of pivotally coupled links; a support structure; a pivot member mounted on said support structure for movements laterally thereon; one link of said linkage being pivotally coupled to said pivot member with the linkage supported therefrom for swinging about said member in a plane perpendicular to the axis of the member; a pattern table mounted on said support structure between said pantograph linkage and said structure for movements to adjusted positions in either direction along a straight line path in a plane parallel to the plane of movements of said linkage about said pivot member; said pattern table having a slot formed therethrough disposed transversely of and perpendicular to the path of straight line movements of said table; said pivot member being extended through and slidably received in said table slot; means for releasably locking said linkage to said pattern table when the linkage is in squared position; a guide member on said support structure providing a cam slot therein; and said pivot member being slidably received in the slot of said guide member for forcing said pivot member laterally in directions to move the pivot member longitudinally along the link on which mounted to adjusted positions thereon by bodily movements of said linkage when in squared position.

16. In combination, a pantograph linkage; a pivot member; one link of said linkage being pivotally coupled with said pivot member and said linkage being supported therefrom in position for swinging movements about said member in a plane perpendicular to the axis of the memher; said pivot member being mounted for movements in either direction longitudinall along the link on which mounted to adjusted positions thereon; a take-off member mounted on another link of said linkage with said link being movable longitudinally relative to said take-of:- member to adjusted positions; means for releasably look-- ing said take-cit member against movement; an adjustment member mounted for movements in either direction along a straight line path in a plane parallel with the plane oi movements of said linkage about said pivot member; means for releasably connecting said linkage to said adjustment member when said linkage is in squared position for effecting movements bodily of said linkage to adjusted positions of said take-on member relative to the linkage; and means operatively connected with said pivot member for eiiecting movements of said member to adjusted positions relative to the linkage and said take-off member by movements bodily of the linkage by said moveable member.

1'2. In combination, a pantograph linkage comprised of pivotally coupled links; a pivot member on which said linkage is pivotally mounted in position supported therefrom for swinging movements about said pivot member in a plane perpendicular tovthe axis of said member; said pivot member being mounted for movements to adjusted positions relative to said linkage; a take-off member. mounted on said linkage. for movements to, adjusted positions relative thereto and to said pivotmember; a tracer arm connected with said pantograph linkage; a pattern table mounted and constrained to movements in either direction along a straight line path; and means for releasably coupling said tracer arm with said pattern table for effecting movements bodily of said linkage and pivot member to effect adjustment simultaneously of saidpivot member and take-off member to predetermined positions of adjustment'relative to said linkage and to each other.

18. A monogramming or embroidering machine of the character. describedcomprising a cabinet adapted, to mount a sewing machine head; a

board carriedby and; extending from said cabinet and provided with means for mounting thereon a monogram, design or emblem stencilled pattern or type block; a work holder adapted to be located and moved beneath the needle or the sewing machine head, a tracer device overlying said board, and a pantograph operative connection between said device and work holder whereby movement of said device in conformity with the monogram design or emblem outline on the stencilled pattern or type block is transmitted to said work holder and the same may be reproduced on the work; said board being slidably adjustable inwardly or outwardly relative to said cabinet, and said pantograph operative connection including means for adjusting the same to vary the ratio between the movements of the tracer device and the reproduced movements of the work holder, said cabinet and said board being provided with mean operatively interconnecting the same with said means for adjusting the pantograph operative connections whereby inward or outward adjustment of said board effects actuation of said adjusting means.

19. In combination; a support structure; a pattern board carried by and extending from said support structure; a work holder mounted for universal lateral movements; a tracer device overlying said pattern board; a pantograph operative connection between said tracer device and said work holder whereby movement f said tracer device in following a pattern on said pattern board is transmitted to said workholder; said pattern board being adjustable inwardl or outwardly relative to said support structure; said pantograph operative connection including means for adjusting the same to vary the ratio between the movements of said tracer device and the reproduced movements of said work holder; and said support structure and said pattern board being provided with means operatively inter- 22 connecting the same with said means for adjusting the pantograph operative connections whereby inward or outward adjustment of said board effects actuation of said adjusting means.

20. In combination; a support structure; a pantograph linkage comprised of pivotally coupled links; a pivot member for said linkage mounted on said support structure for movements to selected positions of adjustment thereon; one Of the links of said pantograph linkage being pivotally coupled to said pivot member with said linkage being supported therefrom for swinging about said pivot member as an axis; said pivot member being movable relative to and longitudinally of said link to adjusted positions thereon relative to said linkage; a take-off member mounted on another of said links for movement relative to and longitudinally of such link; means operatively interconnecting said pivot member and said take-off member whereby said pantograph linkage may be moved bodily and simultaneously relative to said pivot member and said take-off member; and means adapted t be connected with said pantograph linkage for moving said linkage to selective positions of adjustment relative to said pivot member and said takeoff member to vary the reproduction ratio of said pantograph linkage.

KENNETH E. CHRISTOPHERSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,395,489 Glover Nov. 1, 1921 2,253,095 Rothweiler Aug. 19, 1941 2,551,953 Larson Ma 8, 1951 2,624,302 Meister Jan 6, 1953

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