US2294762A - Typewriting machine - Google Patents

Description

Sept. 1, 1942.

.1. L. PETZ."

TYPEWRITiNG MACHINE Filed Nov. 50, 1938 3 Sheets-Sheet 1 2:2]?TOR y mi,

Sept. 1, 1942.

.1. L. PETZ 2,294,762 TYPEWRITING MACHINE Filed Nov. 30, 1938 3 Sheets-Sheet 2 p J. L PETZ TYPEWRITING MACHINE Filed Nov. 50, 1938 3 Sheets-Sheet 3 vlllrlflllllliflllllll INVENTOR X4 %Y Patented Sept. 1, 1942 TYPEWRITING MACHINE John L. Petz, Rochester, N. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application November so, 193 Serial No. 243,125

6 Claims.

each set of forms has been typed and thereafter a shifting the carbon sheets to the next set of forms. As fast as a portion of the transfer material on the carbon sheets becomes exhausted, the retracting movement of the carbon sheet carrier is readjusted to bring fresh portions of the carbon sheets into cooperation with the areas on the forms on which imprints are made by the typewriter.

Such machines have the disadvantage that it is diflicult to maintain exact registry of the forms whereby the entries do not appear in exactly the same positions on all the forms, even when fanfolded forms are used. In order to maintain. sets of forms in registry, there have been developed various forms of sprocket or pin feed devices. whereby sprocket feed pins on the platen engaging rows of marginal perforations in the forms maintain the latter in exact registry at the writing line. It has been the practice to use these sprocket feed devices with a relatively fixed platen and to either spot-face the backs of the forms with transfer material or use the so-called one-time carbons as a means of producing manifold copies. When carbon sheets are used, they take the form of continuous webs which are fed to the platen between the forms and, as each set of forms is typed and separated from the succeeding set, the used portions of the carbon webs are severed along with the forms and thrown away although in most cases only small portions of the transfer material on the discarded portions of the carbon web have been utilized in typing the severed forms. This results in a considerable item of expense for carbon paper which it has'been found difficult to avoid.

As an alternative to using the so-called onetime carbons, the forms are sometimes spotfaced with transfer material on the backs of the portions of the forms in which entries are made. These spot-face carbons, however, are rather expensive and are not a completely satisfactory solution to the problem because of the fact that the forms have transfer material remaining on the backs after the typing operation which makes the forms rather disagreeable to handle as the transfer material soils the hands of everyone handling the sheets and also soils other documents with which they may come in contact.

Thus, on the one hand, there is a considerable expense due to the fact that the one-time carbons are of little use for any other purpose after the forms have been typed, and on the other hand, the spot-faced'carbons are disagreeable to handle and soil everything with which they come in contact.

At first glance, it might seem possible to utilize marginally perforated forms and a pin feed platen, as it is-called in the art, in a machine of the general type disclosed in Patent No. 1,132,055 employing a displaceable platen and a retractible carbon carrier whereby the carbon sheets may be used over and over again until the transfer material becomes exhausted. The problem, however, is not one of simple substitution as might seem at first glance, because the displacement .of the platen causes the sprocket pins of the pin feed platen to become disengaged from the marginal perforations in the forms and the straightening of the forms as a preliminary to displacing the carbon sheets to the next set of forms causes misalignment of the marginal pe'rforations and there is nothing in such machines to compel the pins ofthe platen to properly reengage the marginal perforations in the forms. One reason for this is that the pins are made retractible so as to cause the least amount of interference with the paper deflector, feed rolls,

usually project the greatest extent at the writing line and thus maintain the forms in exact align ment at the writing line. However, to employ these pin feed platen constructions in the machine of the type disclosed in Patent No. 1,132,055, it is essential, if the pins are to reengage the marginal perforations properly when the platen is restored to typing position, that the projecting pins confront the paper deflector whereby, when the platen is lowered to typing position, the pins will reenter the holes in the forms.

The object of the present invention is to provide a means to enable a so-called pin feed platen to be used in a continuous billing machine of the general type disclosed in Patent No. 1,132,055.

An object is to provide means to retain the forms in registry with the pins when the platen is displaced whereby to maintain the registry of the forms while the latter are stretched flat for the purpose of effecting a. shif ting movement between the carbon sheets and the forms.

Another object is to provide a means for automatically effecting a displacement of the pins whereby th latter are brought into a position to cooperate with the marginal perforations in the forms while the latter are stretched out flat for effecting a shifting movement between th carbon sheets and the forms.

Further objects of the instant invention reside in any novel feature of construction or operation novel combination of parts present in the embodiment of the invention described and shown in the accompanying drawings whether within or without the scope. of the appended claims and irrespective of. other specific statements as to the scope of the invention contained herein.

In the drawings:

Fig. 1 is an end view of acarriage embodying the present invention and shows the platen in a normal or typing position,

Fig. 2 is a similar view showing the platen in elevated position,

Fig. 3 is a front elevation of the platen shown,

Fig. 4 is a vertical section on the line 4-4 in F1 .3,

ig. 5 is a vertical longitudinal section through the axisoi the platen.

The reference numeral I0 (Figs. 1 and 2) generally designates the carriage which includes end plates rigidly joined by a channel shaped member I2 formed with two grooves in which ride anti-friction roller trucks l3 by means of which the carriage is movably supported on the front rail [4 and the rear rail l5 of th typewriting machine, The carriage also includes extension plates l6 which are rigidly joined together by means of a cross rod H. The platen is generally designated ill in Figs. ,1 and 2 and is rotatably mounted in arms I9 which are pivotally connected by studs 20 to short arms 2|.

The latter are pivotally mounted on the extension plates l6 by mean of studs 22 riveted to arms 2|. The studs 22 extend through holes in plates l6 and are flattened slightly to receive oblong holes in arms 23 (Fig. 2) whereby the arms- 2|, 23 are keyed together on opposite sides of the plates l6. Attached to the arms 23 are springs 24 (Fig. 2) which are anchored to plates 25 on studs 28 whereby the arms 23 and 21 tend to rock clockwise in Figs. 1 and 2.

There is secured to the left-hand end of the platen (Figs. 3 and 5) a trunnion 21 which has a tubular portion 21a. Secured to this tubular portion 21a is the usual platen rotating knob 28 by -means of which the platen may be rotated by hand. Housed in the bore of the tubular portion m is a plunger 29 having secured to its outer end a finger piece 30 by means of which the plunger 29 may be moved inwardly or to the right in Fig. 3 to release the usual variable spacing clutch. This clutch is disclosed in Patent No. 2,120,360 and is designed to couple the main part of the platen 18 to the line spacing ratchet 3| whereby, under normal conditions, the platen will be rotated by the line space mechanism. On the righthand side of the machine, the tubular portion 21a is replaced by a short shaft 211) (Fig. 5) to which is secured a similar platen rotating knob 28a.

The platen is journaled upon the arms l9 by means of sleeves 32 (Figs. 1 and 3) which are circumferentially grooved at 321a (Fig. 3) to enable the sleeves to. be readily grasped by the operator and moved longitudinally of the tubular portion 21a and of the stub shaft2'lb at the other end of the platen. The sleeves 32 each hav a shouldered portion 32b (Figs. 1 and 3) which fit in an open ended partly circular slot 19a (Fig. 1). The open end of the slot is large enough to permit the free passage of the tubular portion 21a and the stub shaft 211) at the opposite end of the platen but is not larg enough to permit removal of the shouldered portion 32!: except by longitudinal movement toward the knobs 28, 28a (Fig.

3) Such movement of the sleeves 32 is prevented when the platen is in place by plates 33 secured to the'sides of the sleeves 32 by means of screws 34 (Figs. 1 and 3). Riveted to each plate 33 is a stud 35 which fits loosely in a hole drilled in the side of the sleeve32 and designed to maintain the plate 33 parallel with the longitudinal axis tubular portion 21a. Each plate 33(Figs. 1 and 3) has two lugs 33a on opposite sides of the end nearest the adjacent arm I9 and the lugs engage the edges of arms I! alongside of the reduced portion of the slot l9a as shown in Fig. 1 so as to normally prevent longitudinal movement of its sleeve 32. Right-hand movement of the left-hand sleeve 32 (Fig. '3) is limited to some extent by a collar 36. A grooved bushing 36a (Fig. 3) is provided at the opposite end of the platen.

The groove in bushing 36a fits a slot I la in the I right-hand plate ll (Fig. 5) and prevents end play of the platen in the normal position. .The collar 36 loosely lies in a similar slot in the lefthand plate ll.

When it is .desired to remove the platen, the screws 34 are loosened with a screw driver sumciently to permit the plates 33 to move radially of the tubular portions 21a and stub shaft 2") far enough for the lugs 33a to clear the edges of the arms 19. Then sleeves 32 may be moved outwardly toward the platen rotating knobs 28, 28a to disengage the shouldered portions 32b from arms l9 and permit the platen to be detached from said arms by sliding it to the left and downwardly (Fig. 2).

This feature of removability of the platen-is a' distinct advantage in continuous billing machines as the requirements of users of the machine in respect to the number of manifold copies frequently make it necessary to remove the platen and substitute difierent sizes according to the number of manifold copies desired. It is often necessary to substitute a platen having a smaller diameter to accommodate a thicker pack of work sheets with interleaved carbons and vice versa. For ordinary correspondence work and work requiring only a few carbon copies, a standard platen is satisfactory as the feed rolls can yield enough to accommodate the thickness of the pack, but where a very large number of carbon copies is required, the paper deflector and feed rolls cannot yield enough to accommodate the thick paper of work sheets and still latch in typing position properly and it is therefore necessary to reduce the size of the platen. Also there may not be sufficient clearance between the platen and type guide to permit typing a thick pack of forms.

The arms H! are integrally joined together by means of tube 31 (Figs. 1, 2 and 3) and are latched in normal position by means of a pair of latches 38. The latter are secured to a rod 38 shown by dotted lines in Fig. 3, the rod 33 being pivotally mounted in the arms l9 and extending through the tube 31. The latches 38 are located outside of the arms l9 and engage ofl'set lugs 40a of latch platesv 40 adjustably secured to the end plates ll of the carriage. Each latch plate 48 has two slots through which pass bolts ll by means of which the latch plates are secured to the end plates ll of the carriage. By loosening bolts 4| the latch plates 40 may be adjusted longitudinally to provide the proper latching relationship with latches 38.

The platen I8 is raised manually from the position of Fig. 1 to the position of Fig. 2 by means of a. hand lever 42 pivoted on the rod 33 between the left hand arm l9 and the left hand latch 33 (Fig. 3). A stud 42a. on the lever 42 engages an arm 38a (Figs. 1 and 2) formed in the left hand latch 38 whereby, when the lever 42 is raised, both of the latches 38 are released from lugs 400 by the initial movement of the lever. Furthe'r movement of the lever 42 causes the platen to become elevated to the position of Fig. 2. Normally, springs 43 anchored to pins 38b and Nb on the latches 38 and the arms 19 respectively, hold the latches in the position of Fig. 1. These springs, of which there is one for each arm l9, through the pressure of arm 38a on pin 42a, hold the lever 42 against a stop pin lac on the left-hand arm l9 which pin l9c. limits clockwise movement of the lever 42.

After the platen has been raised an extent sufficient for the latches 38 to clear the lugs 4011, a latch lever 44 (Figs. 1 and 2) becomes efi'ective to hold the latches in disengaged position. The lever 44 is formed with two arms with the upper arm provided with a bent-over lug 44a. in the plane of a latch finger 380 formed in the lefthand latch 38. The lower arm is bent inwardly toward plate II and forwardly or to the right in Fig. 1 behind the left-hand latch 38 and normally rests upon the lug 40a, being held against said lug by means of a spring 45 anchored to the pin I9!) and to a pin on the upper arm of the latch lever 44.

Bearing in mind that the lever 42 initially rotates the latches 38 in a counterclockwise direction (Fig. 1) to disengage the latches 38 from the lug 40a before movement of the platen takes place, the subsequent upward movement of the platen will permit the lever 44 to rock in a clockwise direction relative to the left-hand arm l9 whereby lug 44a assumes a position in front of the latch finger 38c thereby: holding the latches 38 in their retracted position as in Fig. 2. The lever 44 is so proportioned that, when the platen is lowered to the position of Fig. 1, the lug 44a will be gradually withdrawn from engagement with the latch finger 380 as the platen approaches the position of Fig. 1 owing to theeventual engagement of the lower arm of lever 44 with the lug 40a.

The object of the construction described above is to relieve the operator of the load which would secured to the outside faces of carriage end plates I l and extension. I6. The slots 48a are so shaped that the axis of the platen generates an irregular curve in its upward movement whereby the platen follows the path shown by the dot and I and 2) and then move vertically. For this purotherwise be imposed upon her by frictional COl'l tact of the lug 40a with the ends of the latches 38. This frictional load would be considerable as it is necessary to provide fairly stiff springs 43 to securely hold the latches 38 inthe position of Fig, 1. Without the member 44, difiiculty is experienced clue to failure of the latches 38 to assume the position of Fig. 1 because, before the platen reaches the position ofFig. 1, it ordinarily has to push down the usual paper deflector and feed roll assembly. This load with the frictional load of latches 38 on lugs 40a, is so great as to require considerable force to latch the platen in normal position.

When the machine is properly adjusted, the lever 44 will not free the latches 38 until the hooked portions thereof are sufliciently below the lug 40a to permit the latches 38 to move to the position of Fig. 1 without wiping over the lower edge of the lug 40a.

The latch lever 44 is pivoted upon a stud 46 carried by the left-hand arm l9. The right-hand arm l9 carries a somewhat similar stud in the same position and on both of these studs are mounted rollers 41 shown in dotted lines in Figs. 1 and 2. The rollers engage the walls of curved pose, the cam slots 48a'are given the curved shape shown in Figs. 1 and 2. The springs 24 are tensioned sufficiently so as to have aslight tendency to raise the platen and when properly tensioned are slightly superior to the weight ofthe platen and the mechanism carried by arms l9 .so as to yieldinglyhold the platen in the elevated position of Fig. 2. It thus requires relatively little effort to raise and lower the platen as the springs 24 fully counterbalancetheweight of the parts carried by the arms I9. In restoring the platen to typing position, the platen has to push down the usual paper deflector and feed roller assembly. Sice fairly stiff the normal position in advance of the platen.

This means consists of a lever system operated by one of the'platen supporting arms for actuating the paper deflector and feed roller assembly. The lever system is so arranged as to require only a small force exerted over a relatively much longer period during the descent of the platen than the period required to disengage the platen from the feed roller and paper deflector assembly during the ascent of the platen. The mechanical advantage of this lever system is one of'force with a high leverage ratio whereby a large movement of the platen and the expenditure of little force is.required to restore the paper deflector and feed roller assembly to normal position.

Pivoted on the. stud 46 (Figs. 1 and 2) carried ,by the left hand arm I9 is a lever 49 having a pin 49a overlying the arm 38a on the left-hand latch 38. The lever 49 is normally held in the position of Fig. 1, with the pin 49a resting upon the arm 38a and lever 42, by a spring 50 anchored to pins carried by the levers I9 and 49, respectively. It is apparent that the initial-movement of lever 42 in rocking the latches 38 will also rock the. lever 49 in a counterclockwisedirection relative to arm l9 to the position shown in Fig. 2. ,Pivotally mounted on a stud 5| carried by arm I9 is an arm 52 having a pin 52a in the plane of the lower'end of lever 49. A spring 53, connected to pins carried by the lever 49 and arm 52, respectively, tends to urge the pin 52a into-contact with the lever 49 whereby, when the lever 49 is rocked to the position of Fig. 2, the arm 52 tends to follow the movement of said lever. The right-hand edge of the arm 52 is formed as an arc of a circle and is in the plane of a lug 54a formed, in an arm slots 48a in slotted plates 48 which are adjustably 54 secured to a cross shaft 55 which is journaled in the carriage end plates II. The shaft 55 extends the full length of the platen between the end plates H and has secured to it an arm 56. The arm is located at substantially the mid-point of the shaft 55 and supports the paper deflector 51. The latter comprises a partly cylindrical sheet metal plate (see Fig. 4 also) on which are mounted the front pressure rollers 56 and the rear pressure rollers 59.

Screwed into a hole in the channel shaped member l2 at substantially the middle of the carriage and underneath the end of the arm 56 is a sleeve 60 (Figs. 1 and 2) having a shoulder for seating the lower end of the coil spring 6i.

The upper end of the coil spring is seated on a shoulder formed in a plunger 62 having a reduced portion at its upper end projecting into a hole in the end of the arm 56. The paper deflector 51 is universally pivotally mounted near 'its midpoint on the arm 56 and the spring 6|,

, acting on the plunger 62 tends to press the paper deflector 51 and feed rollers 58, 59 against the underside of the platen 18 to cooperate therewith to feed work sheets. When the platen is raised, the pressure of spring 6| on the arm 56 causes the feed rollers and paper deflector to follow the platen a limited extent.

The preliminary movement of the lever 42 to disengage the latches 38 results in moving the lever 49 to the position of Fig. 2. This brings the arm 52 into contact with the lug 54a which prevents further movement of the arm 52 for the time being but lever 49 can move a further extent owing to the fact that such lever and arm are resiliently interconnected by the spring 53.- Thus, the initial movement of the lever 42 places the spring 53 under greater tension. As the platen rises, in consequence of further movement of the lever 42 after releasing the latches 38, the circular edge of arm 52 wipes over the lug 54a. Before the platen reaches the position of Fig. 2, however, the end of arm 52 rides of! the lug 54a and snaps to the position of Fig. 2 with the pin 52a again engaging the lower end of lever 49.

Referring now to Fig. 2, as the platen descends, the arm 52 swings in an arc to assume a position overthe lug 54a early in the downward stroke of the platen. With continued downward movement of the platen to. its writing position, the arm 52, pressing on the top of the lug 54a, rocks the lever 54 downwardly and thereby causes the paper deflector 51 and the pressure rollers 58, 59 carried thereby to become lowered in advance of the platen. The parts are so proportioned that when the platen reaches its latching position, the paper deflector 51 and rollers 56, 59 remain in their extreme downward positions until the latches 38 have rotated clockwise with reference to Fig. 1. This allows pin 49a to move downwardly whereby lever 49 rotates clockwisetorurge pin 52a rearwardly so that the end of arm 52 rides oil the lug 54a and permits the spring 6i to rock the arm 54 back to the position of Fig. l.

The arm 52 is made of such length that the pressure rollers 58, 59 are :moved well below their normal position before being released whereby, even with a thick pack of forms, the pressure rollers 58, 59 do not actually press the paper in contact with the platen until the platen is in its normal position. Arm l9, link 2|, arm 52, and arm 54 comprise a compound lever system having a mechanical advantage of force with high leverage ratio with arm i9 as the powerarm. Thus. during the descent of the platen, there is little obstruction oflered to its movement and the restoring movement is very easy and positive.

. The rear or left hand end (Figs. 1 and 2) oi the arm 54 has an arcuate slot 64b through which projects a stud 66 on the carriage end plate Ii. Rotatably mounted on the stud 66 is a release lever 64 having a notch 64a in which is located a roller carried by -a stud 54c on the arm 54. The lever 64. adjacent the notch 64a. is

formed as a cam 64b. counterclockwise movement or the lever 64 is limited by a projecting part 640 of the lever 64 by engagement with the roller on the stud 54c. Adjacent the projection 640 the edge of the'lever 64 is somewhat flattened in a plane at right angles to a line drawn radial of the stud 63 whereby the lever 64 is yieldingly held in displaced position by the lever 54 with no tendency for lever 64 to rotate in either'direction. Secured to the outer end of the stud 63 is a spring plate 66 having a depressed portion 65a embossed thereon engaging a shallow depression in the side of lever 64 to yieldingly hold said lever in the position of Fig. 1.

When it is desired to cast off the feed rolls 56, 59, as for the purpose of straightening work sheets wrapped around the platen, the lever 64 is moved rearwardly or counterclockwise in Fig. l. The cam 64b, in cooperation with the roller on the stud 54c, rocks the lever 54 downwardly thereby rocking. the shaft to depress the paper deflector 51 and the feed rolls 56, 59. Counterclcckwise movement of the lever 64 is limited by virtue of the stop finger 64c. Clockwise movement of lever 64 from the position of Fig. 1 is.

movement thereof in a clockwise direction (Fig.

liVhen the platen is being lowered from 'the pc- I sition of Fig. 2, the lever 64 will be held against clockwise movement until the arm 52 has engaged lug 54a and moved the lever 54 downwardly far enough for the roller carried by stud 540 to clear the lower end of the lever 64 adjacent said roller. Without means to prevent such action, it would be possible to accidentally displace the lever 64 in a clockwise direction during the time that the arm 54 is descending. Owing to the shape of the lever 64, if such action occurred, said lever might prevent the full restoration of the arm 54 to the position of Fig. l. The means to prevent the lever 64 from being moved in a clockwise direction from the position of Fig. 1 while the arm 54 is descending consists of a bentover lug 54d formed in the arm 54. It is appar-. ent in Fig. 1 that afterthe arm 54 has moved downwardly asmall amount, the lug 54 will be positioned in the plane of the lever 64 and prevent said lever from being rocked in a clockwise direction while the lever 54 is depressed below its normal position. It would, of course, be posignates the usual carriage release lever of which there is one on each side of the machine. Each lever is pivoted on a stud like 28 and engages a bail 14 pivoted in the plates H, which the bail actuates the escapement dog release lever 15 piv-,

oted on the top of the rear rail IS. The reference numeral 16 designates the usual line space control lever by means of whiclr the line space mechanism may be set to rotate the platen one, two or three spaces.

Pivotally mounted upon shaft 55 as best shown in Fig. 3 is a bail consisting of arms 11 and a rod 18 attached to the arm 11 by means of screws.

19. The rear or left hand side of the rod 18 (Fig. 2) has a longitudinal slot in which is secured a tearing knife 80 which confronts the platen. The rod 18 also slidably supports two form guides 8| (Figs. 1, 2, and 3) which consist of upstanding plates mounted on a hub 8|a having thumb screws 82 by means of which the form guides may be adjustably seeuredalong the rod 18. The hubs 8|a are slotted to receive the knife 86 which prevents the hubs from turning on rod 18 The construction of the platen is most clearly illustrated in Figs. 3, 4, and 5. Since the variable spacing clutch does not form part of the present invention it will not be described here in, but reference may be made to Patent No. 2,012,360 for a detailed description. Essentially, the platen consists of a shell 84 formed of a section of cylindrical tubing into the ends of which are pressed the end plugs 85, 86. The end plug 85 may have substantially the same shape as in Patent 2,012,360. Integral with the end plug 85 is a tubular portion 81 which extends through a hole in the center of end plug 86. The shaft 21b, by means of which the righthand end of the platen is mounted in the machine, is pressed into the right-hand end of the tubular portion 81.

On the outer surface of the shell as is fixed a tube of resilient material such as rubber 88 which provides the backing for the work sheet. At the ends of the tube 88 are metallic rings 89 which are pressed on the tube 84. Also pressed into the tube 88 are discs 90 having holes through which the tubular portion 81 and a tube 9| pass. The tube 95 is freely rotatable on the tubular portion 81 and in the holes in the end plug 86 at the portions of the platen which are diametrically opposite the writing line. In other words the pins are fully projected at the delivery side of the platen and fully retracted at the introductory side. In Fig. 4, the position of the writing line is indicated by the pin 93 which projects the greatest extent beyond the platen. The shape of the cam is such that 'only a few of the pins 93 actually project beyondthe platen, whereby the forms will be held in absolute alignment at the writing line; but will not interfere with the paper deflector 51.

For the purpose of holding the tube 9| immovable while the platen rotates there is secured to such tube at the right-hand end thereof; a disc 94 to which is adjustably secured, by means not shown, an arm'95. This arm 95 (Figs. 1 and 2) has a slot 95a which embraces the rod 18 carrying the knife 80. While the platen is in the writing position as in Fig. 1, the tube an is held by the arm 95 in a position to cause the pins 93 to be projected the greatest extent at the writing line. When the platen is raised the arm 95 is caused to rotate in a clockwise direction to the position of Fig. 2 thereby causing the pins 93 to project the greatest extent opposite the paper deflector 51 at a point approximately 120 in a clockwise direction from the writing line, as shown in Fig. 2.

In order to keep the forms impaled on the pins 93 while the operator is effecting a relative shifting movement between the forms and the carbon sheets, there is provided a pair of flexible members 96 most clearly shown in Figs. 2, 3, and 4.

and in the discs 98. Secured to the tube 9| adjacent to the discs 98 are cams 92 having cam ribs 92a. The shell 84 and end rings 89 are drilled radially of the axis of the tube 9| and loosely receive two rows of sprocket feed aligning pins 93 which are designed to be moved radially of the bore of the tube 9| and for this purpose they are provided with slots or notches These members are preferably made of metal .such as spring steel or phosphor bronze of high resiliency and are very thin so as to have extreme flexibility to enable the members 96 to be partially wrapped around the platen when the platen has moved to the typing position as shown inFig. 4. The members 96 'are secured to bent over portions 91a, 98a of two levers 91, 98 which are pivotally mounted on the end plug 85 and on a hub forming part of the end plug 86, respectively. The levers 91, 98 each have an arm formed with a slot embracing the tube 31 whereby the levers are prevented from rotating about the axis of the platen.

The members 96 each have a central longitudinal slot 96a to prevent the pins 93 from striking members 96 and also to enable said members 96 to press the forms loosely against the platen when the platen is raised, whereby it is impossible to disengage the pins from the forms without tearin the forms. At the same time the forms are held loosely enough to prevent binding the carbon sheets, whereby the carbon sheets may be moved relatively to the forms. Because of the slots 96a the bent-over portions 91a, 98a of levers 91, 98 supporting said members are bentyokeshaped at 91b, 98b (Fig. 3). This construction permits the pins 93 to pass the bent-over portions 91a, 98a of the arms 91, 98 without collision therewith. For the purpose of avoiding interference between the ends of the levers 91, 98 which support the members 96 and the paper deflector 51, the latter is provided with suitable openings 51a as clearly indicated in Fig. 4.

In order to retain the levers 91, 98 in their proper position on the platen spacing collars 99, I are placed on the shell 84 and on the hub of the end plug 86, respectively. The collar 99 is loosely mounted on the shell 84 between the end plug and the left-hand lever 91 while the collar |00 is loosely mounted on the hub of the end pointed out the fundamental novel features of the invention as applied to a single embodiment, it

will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. In combination with the carriage of a typewriting machine; a platen rotatably mounted in the carriage, said platen being provided-with one or morerows of movable pins disposed circumierentially of the platen and movable radially of the axis of rotation of the platen and having means cooperating with the'pins for causing some oi'the pins to be projected beyond the surface of the platen as the platen rotates, said pins normally being caused to project the greatest extent on the side of the platen on which the writing line is located whereby to align a pack of superposed forms at the writing line; means to displace the platen irom its normal position to 'a non-typing position, means automatically operative, when the platen is displaced to the nontyping position, to cause the pin actuating means to retract the pins ,at the side containing the writing line and to project the pins at the side of the platen confronting the space occupied by the platen when in typing position, and flexible strips movable with the platen for retaining the forms in contact with the platen and in registry with said pins when the platen is displaced to its non-typing position.

2. In combination with the carriage of a typewriting machine, a platen, means to displaceably mount the platen in the carriage for movement from a typing position to a non-typing position, means associated with the platen for aligning forms at the writing line, and means, including a pair of flexiblestrips partially wrapped around the platen when the platen is in its typing position, for retaining the forms in registry with the aligning means when the platen is displaced to a non-typing position, said strips straightening out flat with the forms when the platen is displaced so as to loosely support the forms in registry with the aligning means.

3. In combination with the carriage of a typewriting machine, a platen movably mounted in the carriage for displacement from a typing to a non-typing position; a paper deflector mounted in the carriage and cooperating with the platen to wrap a pack of work sheets with interleaved carbon sheets around the platen when the platen is in its typing position, said paper deflector and platen becoming separated when the platen is displaced to non-typing position to permit the work sheets to be straightened out as a preliminary to effecting a relative displacement between the carbon sheets and the forms; form aligning means movable with the platen and including pins registering with form aligning perforations in the forms, said form aligning means being operative to hold the forms in registry on the 4 registry with the aligning means.

platen; and apair oi flexible strips mounted for movement with the platen and disposed between the forms and the paper deflector, said strips being partially wrapped around the platen when the latter is in typing position and becoming straight when the platen is displaced and efiective to loosely retain the forms in registry with the form aligning means when the platen is displaced and the forms are stretched out flat, whereby to hold the forms in alignment when the carbon sheets are shifted relative to the forms.

4. In combination with the carriage of a typewriting machine, a platen, means to displaceably mount the platen in the carriage for movement from a typing position to a non-typing position, means associated with the platen for aligning forms at the writing line,-and means, including a pair of flexible elements partially wrapped around the platen when the platen is in its typing position, for retaining the forms in registry with the aligning mean when the platen is displaced to a non-typing position, said elements straightening out flat with the forms when the platen is displaced so as to loosely support the forms in 5. In combination with the carriage of a typewriting machine, a-platen movably mounted in the carriage for displacement from a typing to a nontyping position; a paper deflector mounted in the carriage and cooperating with the platen to wrap a pack of work sheets with interleaved carbon sheets around the platen when the platen is in its typing position, said paper deflector and platen becoming separated when the platen is displaced to non-typing position to 'permit the work sheets to be straightened out as a preliminary to effecting a relative displacement between the carbon sheets and the forms; form aligning means movable with the platen and including pins registering with form aligning perforations in the forms, said form aligning means being operative to hold the forms in registry on the platen; and a pair of flexible members mounted for movement with the platen and disposed between the forms and the paper deflector, said members being partially wrapped around the platen when the latter is in typing position and becoming straight when the platen is displaced and effective to loosely retain the forms in registry with the form aligning means when the platen is displaced and the forms are stretched out flat, whereby to hold the forms. in alignment when the carbon sheets are shifted relative to the forms.

6. In combination with a carriage of a typewriting machine, a platen, means to displaceably mount the platen in the carriage from moving from a typing to a non-typing position, means associated with the platen and projecting through openings in the forms for aligning the forms at the writing, line; and means, including at least one flexible element apertured to receive the aligning means and capable of being partially wrapped around the platen when in its typing position, for retaining the forms in registry with the aligning means when the platen is displaced to a non-typing position, said element straightening out flat with the forms when the platen is displaced so as to loosely support the forms in registry with the aligning means.

JOHN L. PE'I'Z.

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