US2128868A - Web feeding mechanism - Google Patents

Description

Aug. 30, 1938.V F. E. WELLER 2,128,868-

v WEB FEEDING' MEGHANISM Original Filed oct. 6, 1952 4 sheets-sheet 1 I "mmm I l HHM L fzzz zgn vzz` z2 M llullmu n "HU u A i.

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INVENTOR ATTORN EY Aug. 30, 1938. F. E. WELLER 2,128,868

WEB FEEDING MECHANISM Original Filed Oct. 6, 1932 4 Sheets-Sheet 2 lNvENToR BYFranlc l'lmller 05ML sfuma v ATToR Evs Aug. 30, 1938. F. E. WELLER WEB FEEDING MECHANISM 4 Sheets-Sheet 3 Original Filed Oct. 6, 1932 INVENTOR BY Frank EWeller W, M NM1. ATTORNEYJ Allg. 30, 19-38. F, WELLER 2,128,868

WEB FEEDING MECHANI SM Original Filed Oct. 6, 1932 4 Sheets-Sheet 4 ATTORN YJ y Patented Aug. 30, 193% 2,128,868 y WEB FEEDING MEcnANrsM Frank E. Weller, Bloomfield, N. J., assigner to Trans-Lux Corporation, a. corporation of Delaware Original application October 6, 1932, Serial No. 636,490. Divided and this application October 26, 1934, Serial No. 750,079. Renewed January 6 Claims.

My invention relates to mechanism for feeding or drawing a printed web through a projection field.

In an important respect, my invention relates 5 to a combined web-feeding and -tensioning arrangement for feeding the web through a projection field while maintaining the same taut and plane to insure highly satisfactory image projection.

10 My invention has further reference to novel features and characteristics of mechanism of the character stated whereby said mechanism may be efficiently and satisfactorily operated by aperson of little skill.

l5 Various other objects, advantages and characteristics of my invention will become apparent from the following detailed description taken in connection with the accompanying drawings.

My invention resides in the feeding mecha- 2i) nism, arrangements and features of the character hereinafter described and claimed. Y

This application is a division of my pending application Serial No. 636,490, filed October 6, 1932.4

For an understanding of my invention and for an illustration of some of the forms thereof, reference is to be had to the accompanying drawings, in which:

Figure 1 is a side elevational view of mechanism as constructed in accordance with my invention;

Fig, 2 is a side elevational View of the mechanism of Fig. 1 but with various parts in different positions;

Fig. 3 is an enlarged vertical sectional view, partly in elevation, of mechanism as constructed in accordance with my invention;

Fig. 4 is a perspective view of a part of the mechanism shown in Fig. 3;

Fig. 5 is a plan view, with parts omitted, of a part of the mechanism shown in Fig. 3;

Fig. 6 is an elevational view, partly in sectionand is taken approximately on the line 4,. 6--6 of Fig. 3 looking in the direction of the arrows; I

Fig. 7 is an elevational view, partly in section, and is taken approximately on the line 1-1 of Fig. 3 looking in the direction of the arrows; 50 Fig. 7a is a sectional view, partly in pian, o1'

a part of the web-tensioning mechanism;

Fig. 8 is an elevational view illustrating a mod'cation of the invention;

Fi 9 is a plan view of a part of the mecha- 55 nism shown in Fig. 8:

Fig. 10 is an elevational view, partly in section, and is taken on the line II0 of Fig. 9;

Fig. l1 is a vertical sectional view, partly in elevation, illustrating a modification of the invention;

Fig. 12 is a plan view, partly in section, of a part of the mechanism shown in Fig. 11; and

Fig. 13 is a vertical sectional view, partlyl in elevation, illustrating an arrangement for passing convection heat currents into contact with a section of the printed web.

In general, my invention relates to a combined printing device and projector, said device p rinting news items on a web which is moved through the projector to project images of the printed characters on a display screen. Although combined devices of this general character are well y known in the art, my invention is important because involving novel features contributing greatly to improved projection and simplication of operation. I

For a detailed description of my invention, reference is to be first had to Figs. 1 and `2, wherein C represents any suitable cabinet or housing having, as herein shown, a detachable or movable door d. Disposed within the cabinet C isra projector P and a printing device D, the latter being movable to the exterior of the cabinet C as hereinafter more particularly described.

As more fully described in U. S. Letters Patent No. 2,018,691, granted October 29, 1935, I represents a base or support which may be suitably secured to the vbottom wall .of the cabinet C. Rotatably mounted on the base I is a turntable 2 which may carry a pivoted latch 3 coactable with a notch in the base I for retaining the parts in the normal position shown in Fig. 1, the latch 3 being releasable, however, so that the turntable 2 may be rotated through an angle of 180 degrees into the position shown in Fig. 2.

Upstanding from the turntable 2 is -a standard 4 on which the aforesaid projector P is supported in any suitable manner.

Pivoted to opposite sides of the turntable 2 are the lower ends of two pairs of legs 5, and 6, 6, the upper ends of which are pivoted to a table 1. The latter carries a pair of spring-controlled latches 8, 8 which coact, respectively, with latching members 9, 9 carried by the standard 4. As clearly appears, the latches 8, 8 serve to retain the aforesaid pairs of legs in vertical position, Fig. 1, and, when said latches are released, said pairs of legs may be moved to inclined position as shown in Fig. 2 to the extent permitted by one or more chains I0, or equivalent.

The printing device D, in the example herein shown, is of the type known to the art as a Dow- Jones printer. The printing mechanism proper is detachablyretained on the table 'I by a frame plate II secured in suitable manner to said table l. Depending from the table I is a housing I2 for the motor and other operating parts of the printing. mechanism.

As well understood in the art, the printing device D comprises spaced, upstanding plates in which is journaled a horizontal shaft I3, Fig. 3, carrying a type wheel I4 having characters distributed around the periphery thereof. The wheel I4 is freely slidable along the shaft I3 but is keyed thereto for rotatable movement therewith. Coactable with the type wheel I4 isan inking roller I5 to which ink is fed by a roller I6, ink being supplied to the roller I6 in suitable manner as well understood in the art. 'I'he rollers I5 and I6 are supported on a suitable frame I'I slidable on a rod I8 and with which the type wheel I4 together with said rollers I5 and I6 are movable as a unit in either direction longitudinally of the shaft I3. Coactable with the type wheel I4 is a platen or presser bar I9 which is normally biased to the position shown in Fig. 3 and which is intermittently actuated, as hereinafter described, for printing purposes.

As shown in Figs. 1 and 2, a pair of the legs 5, 6 support a suitable bracket on which is mounted a reel 20 having a web W wound thereon. This web, in the example shown, is of suitable transparent or translucent material, such, for example. as Cellophane From the reel 20, the web W extends upwardly between the type wheel I4 and platen I9, said web W further extending through the projector P as hereinafter to be described.

After the printing wheel I4 has been rotated to a selected position, the platen I9 is actuated to thrust the Vweb W intoengagement with the selected character on said printing wheel.

The projector P comprises a housing 2| suitably supported on the standard 4, said housing having disposed therein a lamp bulb 22 or other suitable source of illumination. Light from the lamp 22 emerges as a light beam through a lateral opening 2Ia in the housing 2I.

Arranged in horizontal alinement with the aforesaid opening 2Ia is a light passage formed by a bottom wall 23 and spaced side walls 24 and 24a, these walls forming a single casting which is suitably secured to the lamp housing structure. Disposed in the light passage thus formed are a pair of condenserlenses 25, 25a which are detachably retained in operative position in suitable manner, as by thetransverse rod 26 and spring members 21.

Transversely arranged with respect to the side walls 24, 24a is a front4 wall 28, Figs. 3 and 7, which forms a part of another casting suitably secured to the casting which comprises thewalls 23, 24, 24a and which vis provided with an aperture 28a forming the projection field of the herein described projection mechanism, the condenser lens 25 also abutting said wall 28v as clearly shown in Fig. 3. Y

As illustrated particularly in Fig. 3, the aforesaid front wall 28 comprises upper extensions 29v at the respective opposite sides thereof, 'each of these extensions terminating in a pair of spaced ears 30, 30a, Fig. 7.

The extensions 29 of the front wall 28 form bearings for a. transverse shaft 3| on which a plurality of spaced rollers 32 are mounted for rotatable movement therewith. As shown particularly in Fig. 5, it is desirable that each of the rollers 32 be provided with peripheral rows of corrugations along the respective opposite sides thereof, these rows of corrugations being separated by a channel disposed centrally thereof.

Depending from the aforesaid bottom wall 23 are a plurality of spaced ears which support a transverse rod 33, Fig. 3. Mounted on the rod 33 for free oscillatory movement are a plurality of spaced fingers 34 .which extend in parallel relation beneath the wall 23. Figs. 3 and 7a, each finger 34 terminating in an inclined surface as shown in Fig. 3. The fingers 34 are positively biased for movement in a counterclockwise direction, Fig. 3, and, to this end, it is desirable that each finger be formed with an olset mass of malterial 34a of sufficient weight to obtain the desired biasing effect. To prevent the operative ends of the fingers 34 from dropping unduly, it is desirable for each finger 34 to comprise a section 34b through which is threaded a screw 35 Coactable with the lower surface of the wall 23, Fig. 3.

Referring particularly to Figs. 3, 5 and 6, there is shown a frame 36 which, along each side thereof, comprises a pair of spaced ears 31, 31a so arranged that one pair thereof fits snugly'between one pair of the ears 30, 30a while the other pair thereof fits snugly between the other pair of the ears 30, 30a. As shown on the drawings, a screw 38 is'threaded through the pair of ears 30, 38a at the left, Fig. 7, and the pair of ears 31, 31a. which are registered therewith. It results, therefore, that the frame 36 may be swung clockwise from the full to the broken line position of Fig. 5 about the pin 38 as an, axis. The frame 36 may positively be retained in the full line position of Fig. 5 by a screw 39 threaded in the ear 3l) shown at the right of Fig. 7.

In accordance with my invention, the screws 38 and 39 may be interchanged from the respective positions shown in Fig. 5. If this is done, the frame 36 may be swung from the full to dot-and-dash line position of Fig. 5 about the relocated pin 38 as an axis. 'Ihe advantage of this feature will be hereinafter pointed out.

Mounted in upstanding lugs 48, 40a of the frame 36 is a rod 4I on which a plurality of rollers 42 are mounted. These rollers 42 comprise sections 42a which coact, respectively, with the aforesaid rollers 32 and each roller 42 also comprises sections 4217 which gives Weight thereto. As clearly illustrated in Fig. 3, the rollers 42 are loosely mounted on the rod 4I whereby they are biased in a downward direction for a reason hereinafter to be stated.

The aforesaid frame 36 comprises sections 36a, 36a extending downwardly outside of the path of vthe projecting light beam, said sections carrying a journaledshaft 43 having a plurality of spaced wheels 44 mounted thereon for rotatable movement therewith. Preferably, as illustrated, the wheels 44 are edged and they are so spaced that each wheel 4'4 coacts with one of the aforesaid fingers 34.

Secured tothe frame 36 is a bracket 45 formed in part as an annulus for the reception of the casing 46 of an objective lens. I'he'bracket 45 also' comprises depending sections which carry a plate 41 on which a mirror 48 is suitablyv secured, as by the spring clips 49.

In order to place the herein described projector mechanism in condition for operation, the frame 36 is swung on the pivot 38 until said frame togather with the parts carried thereby are moved into the position shown at the left of Fig. 5. A length of the web W is then drawn through the printing device D and laid against the plate 28, said web resting on the' rollers 32 and projecting therebeyond. The frame 36 is then returned to the full line position illustrated in Fig. 5 and the screw 33 placed in the position shown to positively lock said frame in operative position. In so doing, the rollers 44 move against a transverse section of the web W which is gripped between said rollers and the fingers 34. At the same time, the roller sections 42a come into coacting relation with the respective rollers 32 whereby a second transverse section of said web is gripped.

Preferably, as shown in Figs. 1, 2 and 13, an area of the top wall of the cabinet C, above the lamp housing 2|, is provided with the slots or passages 50. The web W is passed through this top cabinet wall C and arranged in overlying relation with respect to this slotted area, said web 'extending beyond the cabinet and hanging down at one side thereof as clearly shown in Figs. 1 and 2.

The mechanism with the web W properly positioned therein for the printing and projecting operations is shown in Figs. 1 and 3. The printing mechanism D, as hereinbefore described, comprises the printing wheel I4 which moves stepby-step along the shaft I3 transversely of the web W, while the latter is stationary, to print a line of information thereon. At the conclusion of each line-printing operation, the printing wheel 4 is automatically returned to its initial position and, simultaneously, a step of movement is imparted to a train of gear mechanism which includes the gears 5| and 52, Fig. 3. 'Ihe gear 52 is carried by a stub shaft 53 rotatably mounted in a bracket 54 carried by a rod 55 secured to the frame of the printing device D, the bracket 54 being maintained in the proper adjusted position on the rod 55 by a screw 56,. The shaft 53 is operatively connected to the shaft 3| and,

preferably, a flexible shaft 51 is thus utilized, one end of the shaft 51 being connected to the shaft 53, Fig. 4, and the other end of said shaft 51 being connected to the shaft 3|, Fig. 7.

`The rollers 32 are mounted on the shaft 3|, the web W being grippedbetween these rollers and the roller sections 42a. Accordingly, it results that veach return of the printing wheel I4 to its initial position eifects actuation of the rollers 32 whereby a step of movement is imparted to the web W, the gear ratio being so chosen as to obtain the desired spacing between the printed lines. As shown in Figs. 1 and 2, the web 'W extends over the slotted cabinet area 50 and hangs down beside the front cabinet wall. The action of gravity on this hanging web section tends to keep the web relatively taut back to the wheels 42.

It follows, therefore, that the web W is moved upwardly step by step to bring the successive lines of printed matter into the projection field, i. e., the field defined by the aperture 28a of plate 28. Light from the lamp 22 passes from right to left, Fig. 3, through the condenser lenses 25, 25a, through the aperture 28a, and then through the web section defined by said aperture, the light beam thereafter engaging the mirror 48 and being deflected vertically upward through the objective lens 46, said light beam thereafter passing to any suitable reflecting system and screen, not

v shown, where images appear of the tape `characters then on the web section in the projection field 28a. These images remain stationary on the screen while the web remains stationary but, each time that the printing wheel I4 returns to its initial position, the printed lines on the web are stepped upwardly` to thereby impart corresponding movement to the lines of images on the screen.

An important feature of my invention involves the passage of the web W exteriorly of the casing C and over the grooves 50. Heated air from the lamp 22 ascends through these grooves and contacts with the overlying web sectionto effect rapid drying of the ink thereon. This is advantageous because permitting the web section beyond the grooves 50 to be handled without smudging the inked characters thereon.

Another important feature of my invention relates to the disclosed arrangement for transversely gripping the web W at spaced points both above and below the projection field.- It is highly important for that web section in the projection iield at any given time to be substantially taut and plane in configuration, i. e., unwrinkled and undistorted. This, in accordance with the present invention, is accomplished in a highly desirable manner.

Immediately below the projection field, the 4- web W is gripped at spaced .points thereacross by the rollers 44 and the fingers 34 which coact, respectively, therewith, the offset weights 34a on each of the fingers 34 functioning to bias the latter toward the rollers 44 with sumcient force to grip the web W in the desired manner. It follows, therefore, that equal restraining forces are applied to the web W at spaced points thereacross and it is against these forces that the web is pulled upwardly by the rollers 32. The latter together with the roller sections 42a also grip the web at spaced points thereacross and, in an even manner, move the web upwardly against the restraining force applied thereto by the fingers 34. In practice, it has been demonstrated that a Web-restraining and -pulling arrangement of the character just described is highly advantageous and efficient because maintaining the web. section in the projection field plane and even with resultant highly satisfactory projection. The provision of the edged rollers 44 is highly important because these rollers coact with the freshly inked surface of the web W.

However, since these rollers are of knife-edge con-v v34a and the roller sections 42h, gives improved results compared with the spring arrangements which heretofore have been generally utilized for biasing purposes. The heat generated by the projection lamp and other adverse factors cause the force of a biasing spring to vary or change from time to time. The biasing effect of the above described weights, however, is constant and lnvariable.

Another important advantage of the herein described invention relates to the arrangement whereby the frame 35 together with the parts carried thereby may be swung to one side when it becomes necessary to rethread the web through the projector field or otherwise service parts of the machine.4 By virtue of the disclosed arrangement, the web rethreading operation is extremely simple and readily performable even by an unskilled worker.

A further feature of importance relates to the interchangeability of the pivot pin for the frame 36. Accordingly, it follows that said frame may be moved to either of the broken line positions illustrated in Fig. 5, it being necessary simply to reverse the respective positions of the screws 38 and 39 as desired. It may be desirable thus to interchange these pivot screws due to some local condition arising in connection with a particular installation which might prevent pivotal movement of the frame 36 in one direction while permitting free pivotal movement in the other direction.

In Fig. 2, I have illustrated the printing mechanism D in the servicing position thereof. The door d of the cabinet C has been removed and lthe turntable 2 has been rotated through an angle of 180 degrees. Thereupon, after release of the latches 8, the printing mechanism is swung 0n the legs 5, 6 to the extent permitted by the chains I0. It will be observed that the flexible shaft 51 is of such length that the described movement of the printing device D to servicing position may be effected without interfering with the driving connection between said printing device and the web-pulling rollers 32. This, obviously, is a distinct advantage. After the printing device D has been returned to normal position, the web section exteriorly of the cabinet may be grasped to pull the web through the projection eld until the slack has been taken up and, thereafter, the normal printing and webpulling action occurs.

Referring to Figs. 11 and 12, there is illustrated a modified arrangement for biasing the web into engagement with the rollers 44. Thus, in lieu of the fingers 34, there is utilized a bar 60, the length of which is about the same as the width `of the web W. The bar 60 is pivoted for movement in a horizontal plane to a second bar 6| which at one end projects beyond the wall 24 and at its other end projects beyond the wall 24a. Pivoted exteriorly on each of the walls 24 and 24a is a bell crank lever 62 which comprises an offset weight section 62a, the levers 62 being suitably connected to the respective opposite ends of the bar 6|.

The levers 62 tend to move in a clockwise direction, Fig. 12, whereby the bars 6| and 6|) are biased in a direction from right to left, Figs. 11 and 12. The bar 60 comprises a sloping surface and maintains the web W against the rollers 44 with the required degree of pressure, the pivotal mounting for said bar 60 permitting the same to assume the proper operative position with respect to the rollers'44. Thearragngement of Figs. 11 and 12 as thus described gives satisfactory results although the arrangement involving the fingers 34, at present, is preferred thereover.

In Figs. 8 and 9, I have illustrated a modification of the invention as regards the driving connection between the printing device D and the projector mechanism P. As shown, the member 55 supports a bracket 10 which carries a stub shaft 1| having secured thereto a cam 12 together with a gear 13 which meshes with the aforesaid gear 5|. Pivoted on the bracket 19 is a frame 14 carrying a cam follower 15 and a mercury switch 16, the frame 14 being biased by a spring 11 in a clockwise direction, Fig. 8, whereby the follower 15 is maintained in engagement with the cam 12. Leading from the switch 16 is a cable comprising a. pair of conductors which lead to the respective terminals of a solenoid 18, said cable including the plug 19 which is readily detachable from the socket for opening the circuit to the solenoid 18. The solenoid 18 may be mounted on the exterior surface' of the wall 24 and is utilizable for actuating a lever 8| which terminates in a gear segment 82 disposed in meshing relation with respect to a gear wheel 83 loosely mounted on the aforesaid shaft 3|. Rotatable with the gear wheel 83 is a disk 84 to which is pivoted a pawl 85 coactable with a ratchet wheel 86 rotatable with said shaft 3|.

'As clearly appears in Fig. 8, the cam 12 is of the double-surface type and, as shown in this iigure, the cam is in one of its normal positions.-

The gear ratio of the train of mechanism leading up to the gears 5| and 13 is such that each actuation of said train of mechanism, as effected by the return of the printing wheel I4 to its initial position, causes the cam 12 to rotate through an angle of 180 degrees.

It follows, therefore, that when said printing wheel I4 returns to its normal position as stated, the cam 12 is rotated counter-clockwise, Fig. 8, through an angle of 180 degrees. As a result, the switch 16 is tipped in a clockwise direction, Fig. 8, and the circuit through the solenoid 18 is closed. Accordingly, the lever 8| is moved in a counter-clockwise direction, Fig. 8, to thereby impart a rotatable step of movement to the shaft 3| while the web W is correspondingly moved through the projection field.

Movement of the cam 12 through the angle of 180 degrees occurs almost instantaneously and, as will be obvious, the switch 16 is immediately returned to the position shown in Fig. 8. As a result, the circuit through the solenoid 18 is reopened and the lever 8| returns to the position shown, the pawl 85 idling with respect to the ratchet wheel 86. The mechanism is now in condition to impart the next feeding impulse to lthe web W which occurs, in the manner described, as soon as the printing wheel |4 again returns to its initial position.

When the application of energy to the shaft 3| is discontinued in response to deenergization of the solenoid 18, there occurs some reverse movement of the shaft 3| in a counter-clockwise direction, Fig. 8, unless special mechanism is provided to prevent such reverse movement. Mechanism` for this purpose is illustrated in Figs. 9 and 10.

As shown, a housing is suitably secured to the extension 29 of the wall 24 and this housing has a disk 94 rotatable therein, the disk 94 being secured to the shaft `3| for rotatable movement therewith. The housing 95 comprises a passage having therein a ball 93 biased by a spring 90 into engagement with the edge of the disk 94.

When the shaft 3| is moved in web-feeding direction by the pawl 85, it moves in a clockwise direction, Fig.' 10. During such movement of the shaft 3|, the disk 94 merely thrusts the ball 93 against the spring 90. However, as will be obvious from Fig. 10, the ball 93 functions as a locking dog and positively prevents counterclockwise movement of the disk 94 and the shaft 3| which is connected thereto.

Since the ball 93 and disk 94 function as just stated, it results that the shaft 3| does not recede, even slightly, from the position to which advanced by the pawl 85. This is highly desirable because preventing the occurrence of sag of the web section in the projection field. Should this web section sag, the resultant projection is more or less unsatisfactory due to poor image focus.

Use of the mechanism last described, namely, the housing 95, disk^94, ball 93 and spring 90 is highly desirable with all forms of my invention. Hence, in Fig. 7, I have illustrated such mechanism as applied to the shaft 3l to prevent receding movement thereof after the application of 5 energy to the shaft 51 has been discontinued.

With an arrangement of the character described in Figs. 8 and 9, it is necessary merely to detach the members 19 and 80 when the printing device D is to be moved to a position such as l shown in Fig. 2. If desired, the conductor arrangement connected to the members 19 and 80 may be of suicient length to permit said printing device D to be moved to the position last named without separation of said members 19 l and 80. With such an arrangement, operation of the printing device need not be discontinued when the latter is in its servicing position.

In the appended claims, it shall be understood that the expressions means for printing,

20 printing device, or equivalent expressions generically comprehend a Dow-Jones or other printer, or any equivalent arrangement such, for example, as a. typewriter, teiautograph, etc. for

.1 producing or forming characters in line form transversely of a traveling web.

While the invention has been described with respect to certain particular preferred examples which give satisfactory results, it will be understood by those skilled in the art after under- 30 standing the invention, that various changes and modications may be made without departing from the spirit and scope of the invention and it is intended therefore in the appended claims to cover all such changes and modifications,

35 What is claimed as new and desired `to be secured by Letters Patent is:

1. In combination, means for printing characters on a web with ink, a projector including alamp housing for projecting images of said if i characters, Ia cabinet for said printing means and projector, said web passing from said projector across the top wall of said cabinet, and

means whereby heat from said lamp housing has free access to a section of the web overlying said 45 top wall so as to dry the ink thereon.

projector, the top wall of said cabinet above said lamp housing being provided with passages, said web passing from said projector across thev top wall of said cabinet and over said passages whereby heat from said lamp housing dries the 5 ink on the web section overlying said passages.

3. In combination, a projecting device, a printi ing device, a cabinet within which said devices are normally received, means for moving one of said devices to the exterior of said cabinet, and a 10 flexible shaft for transmitting power from one of said devices to the other, said 'flexible shaft thus transmitting power when said one device is .either interiorly or exteriorly of said cabinet.

4'. In combination, a projecting device, a print- 15 ing device, a cabinet within which said devices are normally received, means for moving said printing device to the exterior of said cabinet, and a exibleshaft for transmitting power from said printing device to said projecting device, said 20 iiexible shaft thus transmitting power when said printing device is either interiorly or exteriorly of said cabinet.

5. 'I'he combination with a device for printing characters transversely on a web, said device having a gear wheel actuated at the conclusion of each line-printing operation, of means for drawing said web through a projection field, a shaft for operating said drawing means, a gear wheel in which said shaft terminates, a bracket frame carrying said second named gear wheel, and means for adjusting the position of said frame to dispose said second named gear wheel in meshing relation with said first named gear wheel.

6. The combination with a device for printing characters transversely on a web, of a projector and a projection field mounted in fixed position, means for imparting movement to said web to draw the same through said projection field at the conclusion of each line-printing operation, means 40 for movably supporting said printing device whereby it may be moved to a servicing position wherein it is spaced from the xed projection field, and means whereby said supporting means and said printing device may be located in a predev termined position with respect to said fixed projection eld.

FRANK E. WELLER.

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