US1881103A - Copyholder - Google Patents

Description

F. M. SPERLING COPYHOLDER Filed June 16, 1932 3 Sheets-Sheet l ze Vze;

Afval/Zz?? MMM-y Oct. 4, 1932.

F. M. SPERLNG COPYHOLDER Filed June 16 1932 3 Sheets-Sheet 2 llllllllllll @Mor/nego.

Oct. 4, 1932. F. M. sPl-:RLlNG COPYHOLDER Filed June 16111932 5 Sheets-Sheet 3 2;@ 2.5 f7 ze Womad-0.

Patented Oct. 4, 1932 UNITED STATES FRANK M. SPERLING, F BRISTOL, PENNSYLVANIA COPYHOLDER rv i Application filed June 16, 1932. Serial No. 617,657.

The device which forms the subject matter orp this application is an improvement upon the copyholder disclosed in my prior Mapplication No. 597,530, led `on the 8th [Q day of March, 1932.

' In the present application, there is disclosed novel electro-mechanical means whereby the line-finder will be fed downwardly, step-by-step, bythe` operation of a ,101 switch which may be placed on a typewriting machine, or elsewhere, it being possible tofeed the line-i'inder downwardly by a purel ly mechanical operation, as distinguished from an electro-mechanical operation, if de- 163 sired. Divers improvements are proposed in the mechanism whereby the line-lnder is carried, and in the mechanism whereby a step-by-step downward movementy of they n line-finder is rendered. possible. It is within the province oi the disclosure to improve generally and to enhance the utility of devices of that type vto which the invention appertains.

With the abo-ve and other objects in view, which will appear Aas. the description proceeds, the invention resides in the combination and arrangementot parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scopeof what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings:

Fig., 1 shows in iront' elevation, a copyholder embodying the present improvements, parts being broken away;

Fig. 2 is a vertical longitudinal section, c wherein many parts are shown in elevation;

Fig. 3 is avertical longitudinal section, parts appearing in elevation, 'the observer looking in the direction opposite to that in which he is looking in Fig. 2; Y

,y Fig. 4 is a transverse section, at right angles to the table, looking at the electro-magnet, and parts by which the releasing member is mounted and actuated;

Fig. 5 is atop plan of the structure depicted' in Fig-.4;

L Fig. 6 is a sectional view, illustrating the inenting Fig. 6 in the disclosure of one of the stops.

Fig. 11 is a rear view of the electromagnet and parts associated therewith.

The device forming the'subject matter of 65 this application preferably is made of ymetal throughout.

In defining the relative positions of the parts, the words fright and left will be used under the assumption that the operator is looking at the forward side of the device as in Fig. 1, and not at the back thereof, unless otherwise specified. c

lThe copyholder which gives rise to this application comprises a substantially fiat table 1 (Fig. 1) which may be placed as desired. By preference, however, as shown in F ig. 2, the table 1 has a backward slant. Any suitable means may be provided for supporting the table 1, and large latitude is desired in this respect. It may be expedient to connect angle brackets 2 to the lower part oi the table 1, these angle brackets being secured to the upper ring 3 of a support 4, including a lower ring 5, the rings 3 and 5 being connected, as shown at 6 in Fig. 2, in any suitable way, so that the ring 3 and the table 1 which is carried upon it by means of the angular brackets 2, may be adjusted about a substantially vertical aXis. The device may be used with the well-known Morkrum printing machine, which is employed by telegraph companies, railroad companies, and others, although the machine may be used not only by railroad and telegraph companies, but by public speakers, typists, and others, as well. In the present embodiment of the invention, it has been pre-supposed, without prejudice to any other use, that the article is to be employed in connection with a typewriter 7, one of the cally adjustable, if desired, that feature being something lying well within the skill of a mechanic andrequiring no speciiic showing in the drawings. Y

VOn the upper edge of the table 1 there are upwardly extended brackets 10, to which is secured a transverselyv extended track 11. A

carriage 12 is mounted 0n thetrack 11 for4 sliding movement transverselyy of the table 1, and is secured'in place,- for reciprocating `movement from right to left and from left to right as shown at 14 in Fig. 2. Near to its right hand end, the carriage-12phas a rear-y wardly extended shaft'15 (Figs. 2 and 3), on which isjournaled af lr'o'ller"16, mounted to .move between ythe track 11 and an inverted,

U-shaped guide 17,1carried by the track, the parts 16 and 17 cooperatingto'steady the carriage 12 for sliding movement along thev track 11. A f

A transversely disposed rack bar 18 is secured toy upwardly' and rearwardly extended parts 19 of the carriage 12. .Bearings 2O are mounted'on the rear side of the table 1, and in these bearings, aY shaft 21 is journaled for rotation. A pinion 22 iSsecured to-the upper end of the shaft 21 and meshes ywith the rack bar 18 of the carriage 12.; For therotation of the shaft A21, at the willof an operator, the same is provided at its lower end, below `the table 1,'with a turning button 23V. I f- I Two parallel, upwardly extended posts 24 yare mounted vat their lower'en'ds on the car?` yriage 12., 'rlheupper ends of the posts 24 are v'connected by a cross piece 25.

piece 25 is received' within a forwardly extended, U-shaped latch 26 (Fig.` 3) whichv is pivotally mounted intermediate its ends on the cross piece 25, as shown at 27. On the forward end of the latch 26 there isa linger piece Y28. A'pull spring 29 (Fig. 2) -is connected to the cross piece 25 and to the latch V 26, behind thefulcrum 27 of the latch, the tendency of the pull spring being to swing the latch 26 to the right in Fig. 1.

A verticallyl adjustable frame, designated generally by the numeral 30 in Fig.

1,v is provided, and includes a headblo-ck 31,

which can be slidup and downpat the will of anoperator, on the posts 24 of-the carriage 12. The frame 30 is slid upV and kdown by `means of a handle 32 on the headblock 31.` The headblock 31 carries an upwardly extended, bevelled keeper 33, adapted to en-- gage automatically with the spring-actuated `latch 26, when the headblock is raised by means of the handle 32, and lby means of the The cross nger piece 28, the latch 26 can be tilted, on its fulcrum 27, to disengage the latch 26 from the keeper 33, and then' the headblock will slide down the posts 24 on the carriage 12.

The upper end of a guide 34is rigidly secured to a downwardly extended part 94 ofthe headblock 31, and the guide extends downwardly along the table 1, in spaced re, lation thereto. On the lower end of the guide 34, a transverse' arm 35 (Fig 1) is mounted.

A first rack-bar 36 (Figs. 2 and 3) extends downwardly along the table 1 in parallel relation thereto. Upon one edge, the bar 36 has ka rack 37, the teeth of which are spaced widely'enough apart to enable the said rack to Vbe used in connection with typewritten matter that is double spaced. On the opposite edge ofthe bar36l there is a rackv 38, the teeth of which are separated less widely than are the teeth of the rack 37-f0rA single space work. In orderthat the bar 36 may be turned on its axis, Atopresent either the rack 37 Vor the rack38 uppermost, and inoperative position, the lower end of the bar 361s supplied with a knob 40. The lower end portion 95 (Fig. 2) of the bar 36 is cylindrical, and is journaled in the arm 35 on the guide 34, and the upper end 96 (Fig. 3),V

of the bar 36 is journaled in a laterally oset bearing 39'on the headblock 31.

VThe lirst rack bar 36, having the racks 37 andr38von its opposite edges, is mounted to rotate on itsfaxis, .at the will of an operator. Above the first rack bar 36 is located a second rack bar 41l (Fig. 4) having rectangular, downwardly extended teeth 42 (F ig. 3) on its lower edge, the teeth 42 alternating with the teeth 37 Vor 3.8 of the first rack bar 36, dependingV upon whether theV teeth 37 or the teeth38k are disposed uppermost and inoperative position. The second rackbar 41 does not turn o-n its axis, but keeps the position shown in'Fig. 2. The upper end of the rackbar 41 is secured to the headblock 31`by means ofan angle bracket 43, which is shown best in Fig. 5. I Vlhelower end of the rack barf41l is carried byV a post 44 (Fig. 1), and this post is carried (Fig. 2) on the cylindrical lower end 95 of the first, rack bar 36, the said cylindrical lower end of the rack bar36 being mounted to rotate in the post 44. lThepost 44 is located immediately below the arm 35 that is mounted on the guide 34. `A spring tongue 45 is secured to the outer-side of the iixed or` second rack bar 41, as shown in Figs. 7V and 2; The spring tongue 45 bears l against the flat side ofthe first or rotatable rack bar36. When the rotatable rack bar 36V is turned on its axis, by means of the Vknob 40, to present either theV rack 38Lor`the rack 37 of Fig. 3 Y

uppermost, the selected rackwill remain in operative position, because the bar 36 is held releasably against turning on fY axis,

:teeniesV` tongue 45.

- A 'slide block 46 is mounted to reciprocate `ontlhe guide. 34, and on the lower. end of the :5 slide block 46 there is all-shaped extension 47 (Figg2), the upper and lower Varms of which'b'ear, respectively,.onv the upper and lower ends of the guide 34 and cause the slide'block 46 to move smoothly and evenly lmonthe guide 34. On'the upper end of the slide block 46 there is asimilar extension43, having a like purpose.l

. Figure shows that, in the bottom of the.

slide block 46,. therev is a recess 49. An ad- 153 justingmemberf50, in the form of a iod, ex-

tends across-the'recess 49 .and has limited adjustment up and down the table v1, that is,

in-afdirection parallel to the guid-eV 34. VGn the lower end of the adjusting member 50 203 therel is a handle 51, and on the upper end l .of theY adjusting meinberthere is ahead 52,

in which a line-finder 53 is mounted. for longitudinal sliding adjustment, at the will of an operator, transversely of the table 1, as

l 255 Fig. 1 will show. A spring 54 (Fig. 10) is located in the recess 49 of the slide block 46, and is secured to theslide block. The spring bears on the upper edge of the adjusting member 56.u Taking hold of the handle 51, the operator Ycanl slide the' member 50 of Fig. 10 up and down in the block 46, thereby moving the line-finder 53 of Fig. l up or down the table., the line-finder thus being adjusted manually to the position of the 355 line on the paper on the table 1. rlhe spring .B4-of Fig. 10 is a friction brake, function-g ing to hold the line-finder 53 in any position to which it may have been adjusted, as aforesaid.

405 A paper holder 55 extends lengthwise of the table 1 and transversely of the line-finder V53, beneath the line-nder. The upper endA ofthe paper holder A55 is connected, as shown inV Fig. 2, to the part 94 of the headblock31,`

455 the lower end of the paper holder being connected to the arm 35 on the guide 34, as Figs.

1 and7 will makemanifest. Y

The upper end of the slide block 46 (Fig. 1) is locatedv within a U-shaped latch lever 5M 56,' fulcruined intermediate its ends at 57 (Fig.V on the Y slide block. The downward movement'of the upper end of the latch lever 56 is limited by a stop 58 on the slide 55? block. ln the upper endV ofthe latch lever 56 is secured a transverse finger 59, which as shown in Fig. 3, is of angular form.Y The transverse finger 59 has a thinned end 60 (Fig. 9) which, when the lever 56 is swung 6,05 up and' down on its fulcrum 57 ,moves up and downbetwecn the teeth of the single spaee'rack 33 on the first or rotatable rack bar 36 and the teeth 42 of the second or fixed rack bar.41f: or between Vthe teeth 42of-the 65E rackbar 41 and the teeth 37 of the rack bar 36, if'the teeth 37 are uppermost, for double spacing.

A laterally offset shaft 61 (Fig. 1) extends lengthwise of the table 1, across and above the linger 59 (Fig. 8) of the lever 56, inwardly of the thinned end 60 of the linger. It is shown in Fig. 7 that the lower end of the shaft 61is mounted to rock in the post 44 of Fig. 2. Referring to Fig. 3, the upper end of the shaft 61 is journaled in the bracket 43 which connects the rack bar 41 to the headblock 31. lThroughout the major portion of its length, the shaft 61 is parallel to the second rack bar 41, the guide 34 and the paper holder 55, as Fig. 1 will show.

A releasing member 62 extends lengthwise of the table 1 (Fig. 1) and is located underneath the finger 59 (Fig. 8) that is carried by the latch lever 56. At its lower end, the releasing member 62 has a laterally offset arm 63 (Fig. 7) which is pivoted to the transverse member 35 (Fig. 1) on the guide 34. rEhe arm 63 of the releasing member 62 has a laterally extended finger piece 64, shown in Fig. 1, and employed to operate the releasing member manually, although the releasing` member generally is actuated by an electro-mechanical means connected to the typewriter fra-me bar 8, and described hereinafter.

Secured to the upper end of the releasing member 62 is a hanger 65 which is U-shaped in top plan (Fig. 5). The upper arm 66 of the hanger 65, is, in substance, an arm on the releasing member 62, like the lower arm 63 of Fig. 7. rllhe arm 66 is pivoted at 67 (Fig. 4) on the headblock 31. lThe lower arm 69 of the hanger on the releasing member 62 has a notch 7 O (Figs. 4 and 1) that receives the crank or offset portion of the shaft 61. A;

pull spring 71 is connected to the lower part of the hanger 65, below the pivotal mounting 67 of the hanger, and to a part 72 of the paper holder 55. An angular stop 97 (Figs 5 and 11) is secured to the upper or back side of the arm 66 of the releasing member 62, and has a reaiuvardly-extended end 98, located above and about parallel to the upper surface of the headblock 31, the end 93 of the stop working beneath a guard 99, superposed on the bracket 43 and secured, with the bracket, to the headblock 31. Noting the arrows in Fig. 11 and the pull spring 71 of Fig. 4, it will be clear that as the spring 71 tilts the upper end of the hanger 65 to the right in Fig. 4, on the fulcrum 67, to lower the releasing member 62, the end 98 of the stop 97 will engage the upper surface of the headblock 31, and terminate the movement of the hanger 65 and the releasing member 62. Noting the electro-magnet 7 4 of Figs. 4and 5, to which the hanger' 65 is responsive, as hereinafter explained, lit will be understood that as the electro-magnet causes the upper end of the hanger 65 to swing to the left in Fig. 4, the end 98 of the stop 97 will engage the upper surface of the i headblock 31V and terminate the ino'vem'ent of v the hanger and the releasing member.Y

Itk is Ashown in Fig. that an Varmature ,Y 1 713. is mounted on the upper arm 66 of the 5- hanger 65 and isinsulated therefrom. The.

armature 73 is responsive to the aforesaid electro-magnet 74, which is mounted on the headblock 31. The `ends of the winding 75 (Fig. `1) of the electro-magnet 74 are connected to spring tongues 76 carried by brackets 77 on the headblock 31,;the tongues 7 6V being insulated from the brackets. The spring tongues 76 bear against conducting standards 78, mounted on the carriage 12, but insulated therefrom. To the upper ends of the standards 78 are joined conductors 79 lleading to a normally open electrical switch 80, mounted .the shelf 9, and are held down, nearto the right hand margin, by the paper holder 55. The line-finder 53 is under the lineof matter which is being copied, and casts no shadow. The paper holder 5,5 can be adjusted readily, Vto the left or to the right, so as to hold down the papers, and at the same time obscure little or none of the text. The adjustment of the paper holder 55, yto the right or to the left, is brought about .by turning thel button 23 of'Fig. 1, the shaft21 being rotated, and the pinion 22fon the shaft cooperating with the rack bar 18 of the carriage 12, to move the carriage to the left or to the right. Vlhenl the carriage 12 is moved transversely of the table 1, the frame 30 (which'includes the paper holder 55) isl moved laterally, also, because the headblock 31l of the frame 30 is carried by the posts 24 of the carriage 12, as vthe carriage slides on the track 11. rllhe frame 30 may be adjusted vertically, through Y the medium of the handle 32 on the headblock 31, because the headblock 31 of the frame can slide vertically on the posts24 of the carriage 12. ylhis vertical adjustment of the frame 30 and of the paper holder 55 of course enables thevr paper holder to cooperate with the stack of papers on the tablel, regardless ofthe heightof the stack. The headblock 31, and parts carried thereby, are heavy4 enoughV to cause the. paperholder 55 to have a firm pressure on the stack of papers.

When the frame 30 is elevated by the handle 32, as theheadblock 31 slides upwardly on the post 24 of the carriage 12, the beveledv keeper 33 on the headblock engages automaticaliy Yizvtlfdi'e) iat-@526mm i's-pvotci at 2T on@ the cross piece and is actuated by the spring 29. The latch 26 may be swung manually by means of the linger piece 28, to ydisengage the latch 26 from the keeper 33 and let `the frame V slide downwardly onfthe posts 24 of the carriage 12, to the position of Figs. 1 and 3.

' As to the up and down transverse adjustmentof the line-finder 53, relatively to the si'ldeblock 46, as distinguished from the movement brought about when'the block 46 is. slid bodily along the guide bar 34, lit will be clear, when Figsl() and-2 are compared, that `all that the operator has todo is to move the member (which carries the line-finder 53)- up or down in the-slide block 46, the said member being frictionally held in its adjusted position by the'spring By means ofthe knob 40, thejsecond rack Y Bll bar 41 may be reversed on-its axis, to bring either therack l38 or the rack 37 ofFig. 3 uppermost, depending upon whether the matter to be copied is single spaced or double spaced. n v

Referring, first, to the'operation of the latch lever 56 of Fig'. 3,in conjunction with Fig. .A8, Yand disregarding for thek moment the remote control lof the latchlever, it will be clearA that as theupper end of the latch lever 56 is raised, the thinned outer end 60 of the finger 59 on-th-e latch lever will move out of the rack 38 on thebar 36 (Fig. 9), into engagement with the teeth 42 of therack bar 41 and when the upper end ofthe latch lever 56 in Fig. 3 moves downwardly, the thinned end ofthe finger 59Vwill engage with the next lower tooth 38 of the rack bar 36, the slide blocky 46 .moving downwardly one stepV along Vthe guide34, and the line-finderl 53 being carriedk downwardly one step, accordingly.

In the preceding paragraph, reference has.

been made to the remote controlof the latch lever 56 andthe linger 59 of the latch lever. rlhere are two' remote controls, one being purely mechanical, andthe other being electro-mechanical. The purely mechanical control willbe discussed first, notbecause it is of primary importance, but because it is the c simpler of the two, and forms abasis from which the description of the operation of the electro-mechanical control can be built up.

Referring to Fig. 1, and noting the linger piece 64 on the arm 63 (Fig. 7) of the releasing member 62 (Fig. 8) it will be understood that when the nger piece 64 Vis pressed downwardly, the releasing member 62 will be raised, Vthe releasing member swinging upwardly o-n its pivotal connection 64 (Fig. 7) with the arm 35 at the lower end of thel guide 34, and on the pivotal connection 67 (Fig. 1) between the hanger and the slide block 31, it being recalled that the hanger 65 is, in substance, an offset a-rm onthe releasing mem- 1-lcated above the finger 59,1ser'ves to keep the end 60 of the finger 59 engaged with the rack j b.er62,resembling the lower arm 63 (Fig: 7

' of the releasing member.

,Asthereleasingmember 62 8) moves upwardly, it raises the thinned end 60 of the linger 59 out of engagement with the rack 38 38 ofthe bar 36, but when the releasing member 62 is raised as aforesaid, the shaft or holding member 61 willl be raisedalso, per-` mitting the end 60 ofthe finger 59 to rise out of therack` 38 lon the bar 36... The raising of,

theA holding member 61 is `brought about by the lower arm 69 of the hanger 65, the offset partof the shaft 61 beingreceived slidably in the notch 7 O of the arm 69; y, The hanger Y65, including the part 69 is,'in substance, an arm on the lupper end of the releasing member 62, and resembling,in broad function,

the arm 63 shown on the lower end of the re-y leasing member 62 -inFig 7. As thehanger 65 and-its arm 69 swing upwardly, on the pivotal connection 67V (Fig- 1) betweenthe hanger' and the headblock 31, the holding member 61 of Fig. 8 will be raised at the same time that the releasingvm-ember 62 .is raised toV release the part ofthe finger 59 from the rack 38 on the bar 36.V Nhen the operator relieves the pressure on, the finger piece 64 of Fig. 1, the parts will resume the po-v sition of Fig. 8, under the pull of the spring 71 of Fig. 4, the said spring being connected tothe hanger that carries the upper end of the releasing member 62, and to the bracket 72 on'the headblock 31.

The description'iabove concluded relates to the purely mechanical control of the step-by- Y step downward movement of the slide block 56 and the line-finder 53. Passing to the electro-mechanical control, it will be observed that 'when the operator closes the switch 80 on the frame 8 of th-e typewriting machine 7,

by means of the push button 81 of Figs. 1 and 2, an electrical circuit through the winding 77 of the electromagnet 74 is closed, the magnet is energized, the armature 7 3 on the hanger 65 (which carries the releasing member 62) is attracted by the magnet 74, and the same operation takes place as occurs when the parts are actuated by the finger piece 6l. A comparison of the finger piece 64C and the armature 7 3 inv Fig. 1 will indicate at a glance, their similarity in function.

rThe circuit that is closed by the push button81 of the switch 8O includes the conduc- Vthe push button 81 of the switchV 80 is located Y closely adjacent to the keys ofthe typewriter 7, andcan be operated as easily as any of the standard typewriter keys, or the spacing bar of the typewriter.

What is claimed is 1. In a device of the class described', a paper-holding table, a gravity-actuated slide, means for mounting the slide for movement downwardly along the table, a linefinder carried by the slide, mechanism for limiting the downward movement of the slide and thel line-finder to a step-by-step progression, said mechanism including a movable actuating part for said mechanism, electro-mechanical means for operating said actuating part, and a device for controlling the electro-mechanical means from a remote point.

2. A device of the class described,y con-V structed as set forth in claim 1, and further characterized by the fact that the electromechanical means comprises an electro-magnet supported .from the table, an armature on said movable Vactuating part and responsive to the electro-magnet, a circuit including the winding of the electro-magnet, and said device being a switch interposed in said circuit.

3. In a device of the class described, a table, a gravity-actuated slide, means for mounting the slide for movement downwardly along the table, a line-finder carried by the slide, a rack supported by the table, a latch cooperating with therack to limit the downward movement ofthe slide and the line-nderto a step-by-step progression, means for mounting the latch movably on the slide, cooperating parts including a member .holding the latch engaged with the rack and a member engaging the latch to disengage the latch from the rack, means for supporting said cooperating partsmovably with respect to the table, interengaging elements on said cooperating parts formoving them in synchronism when one of them is actuated, and means for actuating one of said cooperatmg parts.

LA vdevice of the class described, con.-`

as Y,

the downward movement of theA slide and the line-finder to a step-by-step progression, means for mounting the latch movably on the slide, a pair of shafts having cranks located on opposite sides ofthe latch, theV movable tomove'thelatcli Ybe,-` tween the' ncranks, longitudinally of the shafts, kmeans for mounting the' shafts forV grocki-ngmovement, means for Connecting the v.shafts operatively togethenand means forVA 'operating one sha-ft.V

6..'A device V.of the class described, con- `stifuctedas set forth in claim 5, and further characterized Vby the fact that the means for v 4connecting the shafts operatively together is a transverse arm on one shaft, the arm being 'engaged with the'crank ofthe o therl "shaft A H i i l7.-'fIn a device ofthe class described, aV Vtable,"a guide extended-along the table, a slide mounted to reciprocate upon the guide,

means for controlling thel movement of the slide, a line-finder, and means for mounting Mthe line-finder v`on Vthewslide Lfor adjustment with respect to the slide, transverselyyof the line-findendand longitudinally of the guide. y

fio

" 8. Inj a device of the; class describeda table, guideV extended v along the table, faslidemounted togreciprocate upon thel guide, means fory controlling,.the/movement of the slide, an operating `member movable in the` slide, at theqwill of operator, in a direction substantially parallelto the guide, a l eline-Ender disposed transversely of the guide` and carried'by the operating member, and means fory holding the operating member in adjusted positions with respect to the slide.

ably, mountedgonithe slide and cooperating one@ posts, a keeper calamity. @he Bead! block, across piece connecting the posts, a Y

latch movably moun'ted'vonv the cross piece, spring means for operatingthe latch to hold' itin the pathof the'keeper, when the head- Yblock is moved upwardly yon-the post's,a line nder cooperating with the table,`and means forfmounting the line-finder Von the headblock.v I y v 12. In a device of they class described, a tafor movement with respect Yto the table, aline` linder carried by ltheslide'and cooperating with the table, a' latch movablyv mounted onv Y.the slide, a first'racklocated below the. latch and having lines of teeth, the teeth. ofthe lines being` differently'. spaced, means for mounting the., first rack for axial rotation, to present either line of teeth to the latch, a second raclrand meansfor mounting the second rack .abovethelatch, the .secondfrackv having teeth which alternate with the teeth of both Vlines on the first rack, and means un-y der the control of anoperator for actuating the -latch to causevthe latchgto move between Y the teeth of the selected line on the first rack andthe teeth ofthe second rack.v l Y Y 13. In a device ofthe class described, atabl'e, a gravity operated, releasable line-nder,` means for mounting the line-finder forvmove ment withv respect tothe table, mechanism. Vfor constraining the'movement of the linefinder to a step-by-step` movement,-when the 71'5 y, ble, a slide, means for Asupporting the, Slide L p soi line-finder is released, andan electro-'mechanf .00

ical means accessiblefrom a remote pointand under the control'ofan operator for releasing the line-finder. Y v 1 y In testimony that I claim the. foregoing as. my `own, I have hereto affixed my signature.

- FRANK M. SPERLING.

with the rack tol-limitfthe movement of the n s slide toa stepby-step progression, a shaft inr-k cluding a `crank portion engaged with] the`V latch to disengage the latch from the rack, the

shaft including arms, one of which is pivoted f to the headbloclr7 the other of which'is pivoted e to the'means for mounting the slide, means for rocking the shaft, and a stop carried bythe first specified one of said arms and engaging the headblock tov limitl the movement of theV shaft.

10.7A.kv device of the class describedfccinnstructedy asY set forth in claim 9 and furtherk characterized by thefact that the'means for v rocking the shaft-embodies an armature onfV said one of the arms, fand anrelectro-ymagnet.

O nthe headblocl, the armaturebeing responp sive to the electro-magnet.

l1. j-A device of he class Vdescribed compris- Y ing fa table, a carriage movable transversely of ,the table, means formoving the carriage `V`4transversely of the table, posts mounted on Y l 'the"carriage, a headblock slidable vertically y lso

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