US2300276A - Strip feed for typewriting machines - Google Patents

Description

m. 27, 1942. L. F. HAGEMAN 2,300,276

STRIP FEED FOR TY-PEWRITING MACHINES Filed Dec. 9. 1939 4 Sheets-Sheet 1 ATTORNEY 0a. 27, 1942; F. HAGE MAN 2,300,276

STRIP FEED FOR TYPEWRITING MACHINES 4 Sheets-Sheet 2 Filed Dec. 9, 1939 ATTORNEY Oct. 27, 1942. L. F; HAGEMAN STRIP FEED FOR TYPEWRITING MACHINES Filed Dec. 9, 1939 4 Sheets-Sheet 3 ATTORN EIY Oct? 1942- F. HAGEMAN STRIP FEED FOR TYPEWRITING MACHINES 4 Sheets-Sheet 4 Filed Dec. 9, .1939

' INVENTOR Lou/w F fiaszwmfl,

ATTO R N EY Patented Oct. 27, 1942 STRIP FEED FOR TYPEWRITING MACHINES Louis F. Hageman. Niagara Falls, N. Y., assignor to American Sales Book Company, Inc., Niagara lit-Evy f measles Falls, N. Y., a corporation of Delaware Application December 9, 1939, Serial No. 308,438

4 Claims.

This invention relates to improvements in typewritingand similar inscribing means, and more particularly to improvements in the mechanism for feeding the record strips into writing position and for feeding the carbon or transfer strips into transfer position with reference to the record strips.

;It is a general object of the invention to provide an imprbvedfeeding mechanism for the record strips and also .an improved feeding mechanism for the transfer or carbon strips, assuring at all times sufiicient carbon material in transfer position, so that the transfer inscriptions are always full and easily readable.

A further and more particular object of the invention is to provide an improved differential feed mechanism for feeding the carbon strips at g a slower rate of speed than the feeding movement of the record strips, thus assuring clear,

legible transfer copies at all times and, at the same time, utilizing substantially all of the transfer material of the transfer strips, and economizing in the use thereof.

A further object of the invention is to provide for machines of the class mentioned an improved strip feedin mechanism for drawing the record strips by tractive effort into writing position on a writing platen of the flat stationary type. A further object is to provide for a differential feeding mechanism for transfer strips, an improvedreleasing connection or coupling for setting the feed in different driving positions, and providing for the returnof the transfer strip supply carriage to itsinitial position after it has i been moved forwardly by the differential feed ing mechanism.

Still another object of the invention is to provide an improved equalizing mechanism for equalizing the movements of the transfer strip supply carriage as it is fed forwardly to effect feeding movement of the transfer strips, and to avoid:

binding or skewing of the carriage during its feeding movements.

Other objects of the invention will be in part pointed out in the following detailed description of an illustrative but preferred embodiment of,

the invention, and will be in part obvious in connection therewith.

The invention accordingly comprisesthe features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the claims.

For a more comprehensive disclosure of the 55 Fig. 1 is an end elevation of a typewriting machine embodying the invention; I

Fig. 2 is an end elevation of the opposite end of the machine shown in Fig". 1;

Fig. 3 is an enlarged fragmentary plan view of the machine shown in Figs. 1 and 2, parts being removed, broken away, and in section to reveal the structure and arrangement more clearly.

Fig. 4 is a vertical sectional view taken substantially centrally of Fig. 3, looking toward the right in Fig. '3;

Fig. 5 is an enlarged vertical sectional view taken substantially on the lines 55 of Figs. 3 and 4, parts being shown in elevation and parts being broken away;

-F'ig. dis a fragmentary sectional view taken substantially on the line 6-5 of Fig. 4; r

Fig. '7 is a detailed sectional view taken substantially on the line 11 of Fig. 4; and

.Fig. 8 isa perspective view. of an assembly of,

record strips such as used in machines of this type.

Referring to the specification for a detailed description of the embodiment there shown, the improvements have been incorporated in a typeplaten carriage and for other purposes that need not be herein described. A release key 13 is connected to the platen carriage of the machine for releasing the carriage to movement in letter spacing direction.

Mounted in the upper part of the typewriter frame is the platen carriage l4 mounted for transverse movements of the typewriter frame for letter spacing as by means of supporting rolls IS in well known manner. A platen i6 is attached firmly in operative position on the carriage It being preferably connected at its oppo-. site ends to the supporting end plates [1 of the carriage. The platen carriage includes a sepa-i rate unit or frame including the end plates" carrying the platen I 6 andmovable vertically for bringing type characters into alignment with the platen as later described. This platen, as shown, is preferably of thestationary type having a surface for supporting the record strips in writing position adjacent to the type of the type bars l 2. This platen may be provided with a striking surface adapted to yield slightly upon impact of the type bars. This surface, as shown, is provided by means of a facing I8 that may be constructed of hard rubber or similar firm resilient material. The striking surface of the platen need be only of sumcient width to accommodate the type, its diameter being only slightly greater than the height or length of type forming each character.

The separate unit or frame of the platen carriage is mounted for vertical movements in the main part of said carriage so as to position the platen opposite to the upper characters of the type bars when the carriage unit is raised, and opposite tothe lower characters when the unit is lowered. This vertical movement is provided for by supporting lugs l9 attached to the end frames or plates l1 and engaging in vertically elongated slots 20 in supporting brackets 2| attached to the platen carriage by supporting members 2| and movable therewith in letter spacing direction.

The vertically movable frame or unit of the platen carriage is supported in its lowermost position by means of supporting lugs 22 and is raised from this position by means of actuating levers 23 engaging with supporting pins 24 connected to the end plates l1. These actuating levers may' be operated to move the vertically movable unit or frame of the platen carriage upwardly and.

downwardly by connections to one of the keys of the keyboard II in a manner well understood in the art.

It will be noticed that the entire platen carriage is movable transversely of the typewriter frame on the supporting rails I5 for letter spacing, whereas the platen unit or frame including the supporting end plates I1 is movable vertically upon the main part of the platen frame for bringing the platen into alignment with the upper andlower characters of the type bars. The two opposite-supporting plates l1 may be appropriately connected together to provide a unitary platen frame by means of transverse tie rods 25. Record strip feeding mechanism is provided for feeding the record strips into inscription receiving position adjacent to the platen I 6. As shown, this feeding mechanism includes two laterally spaced flexible feeding units or feed chains 26' having pivotally connected links and being mounted upon rotary sprockets 21, one of which is a driving sprocket. This feeding mechanism, as shown, is mounted upon the vertically movable platen unit or frame and is positioned above or beyond the platen IS in the path of strip feed for pullin the record strips with a tractive effort across the writing surface of the platen. Any number of record strips from one or two to six or eight, or more, may thus be fed over the writing platen and it will be noticed that the parts of the strips adjacent to the platen are free from extraneous pressure so that the carbon strip or strips may be fed relatively to the record strips to bring different parts thereof into transfer position as later more fully described.

The driving sprocket wheels 21 for the feed chains 26 are mounted upon rotary shafts 28, one of which, as for example the upper shaft, is provided with an operating extension positioned outside of the adjacent supporting plate l1 and provided with an operating knob or handle29, by means of which the feed chains may be operated to feed the record strips. The operating means may be provided with 'a clutch 38 and a toothed I lower ends of the end plates ll of the verticallywheel3l, with which engages a roller mounted upon a spring pressed arm 32 for effecting step by step feeding action in measured amounts for the tie rods 25, one bracket for each of the flexible pin feed elements 26. These brackets 33 extend between the two opposite sprockets 21 so as to provide a rigid frame unit. This structure is fully described in the Mabon Patent No. 2,171,003, issued August 29, 1939, and, therefore, need not be described in detail herein. Also, the feed pins 34 of the feed chains are, as shown, preferably mounted so that the strip engaging feed transmitting parts thereof are disposed substantially below the pitch line of the feed chain; also, as fully' described in the Mabon patent referred to. This mounting of the pins provides for more accurate feeding and positioning of the record strips as fully set forth in said prior patent.

.A strip guiding and retaining member 35 is adapted to engage the record strips adjacent the v path of engagement therewith by the feed pins 34, as best shown in Figs. 4 and 6. The strip guide 35 has an elongated guide plate 35 adapted to engage the surface of the strips and having an elongated slot 31 in which the fed pins run. The strip guide 35 is mounted for pivotal movement at 38 on a bracket 38 and is provided with a leaf spring 40 secured thereto, engaging a, part of the bracket 39 so as to tend to urge the guide into its normal operative strip guiding position as shown in Fig. 6. During threading of the strips into feeding relation with the feed pins, the guide may be swung away from the pins upon its pivot 38 and is held in its raised position by engagement of the end of the leaf spring '40 with the flat surface of the bracket plate 4|.

Strip guiding plates 42 are connected to the movable platen unit or frame, extending transversely across the strip path adjacent to the platen l6 and spaced apart slightly so as to provide guiding channels for the reception of the record and transfer strips to guide the latter into writing position with reference to the platen. These guide plates 42 may be appropriately attached in position to'the end plates I1.

The carbon supply carriage 43 embodies an upright frame including upright end plates or brackets 44 between which are the housings or 1 spools 45 for the carbon supply rolls 46. At

' their lower ends the end brackets 44 of the carbon carriage are provided with guiding and supporting member or blocks 41 having channels on their outer surface for slidably receiving the'supporting rails 48. The channel blocks 41 receive the rails 48 in closerelation so as to provide slides providing for movement of the carbon carriage toward and away from the writing platen I5. Also, engagement of these channel supporting members 41 with the supporting rails 48 function to maintain the carbon carriage in substantially upright position as seen in Fig. 4. The supporting rails 48 are preferably attached in operative position as shown in Fig. 4 being attached to and supported by the supporting brackets 2i, and they may be integral therewith as shown. These rails extend rearwardly from the supporting brackets in laterally spaced relation. As shown, it is desirable in some cases that these supporting rails incline downwardly toward the ments :of the opposite sides of the carriage along the supporting rails and to avoid skewing and obstruction to feeding movements. As shown, this equalizing device includes racks or rack-bars 49, shown as being connected to and extending along the respective supporting rails 48. Engaging with the teeth of the rack bars are toothed pinions 50 firmly attached to and rotating asa unit with the rotary shaft mounted in the end plates or brackets 44. The pinions 50 are thus constrained to rotate as a unit so that any tendency of one end of the carriage to move ahead or behind the other end iscompensated or equalized by this equalizing connection. Freedom of movement of the carriage along the supporting rails is thus assured and binding tendencies are counteracted.

The carbon supply spools or housings 45, as shown, are preferably in the form of metallic cylinders having slots 52 through which the carbon strips extend from the supply rolls 48. The cylinder housings are provided at their ends with supporting trunnions or pins 53 engaging in supporting slots 54 in the end plates 64. The cylinders thus extend between the Plates 44 in supported position. Transverse frame members 55 connect the opposite end brackets 44 providing a frame which is sufliciently rigid for supporting the carbon cylinders in position.

As shown, in Fig. 3 each carbon cylinder or housing '45 has a removable end piece 56 connected to which is an inner spiral spring 51 having attached at its inner end a disk 58 yieldingly pressed into engagement with the cylindrical core or spool 59 on which the carbon supply 46 is wound. The opposite end of the core 59 has a flange B0 contacting with the adjacent end of the cylinder. The disk 58 is thus yieldplaten during feeding of the record strips. As best shown in Figs. 3 and 5, this driving connection includes a coupling head 58 recessed to rotatably receive the adjacent end of the equalizer shaft 5|. The connecting end of this shaft has a circumferential groove 69 receiving the connecting lug III of the connecting screw ll. Thus the coupling head is firmly attached to the end of the shaft 5| so asto transmit tractive effort to the carbon carriage, while free relative rotation of the shaftand head is permitted by means of the connection described- At its underside the coupling head 68 has a recess 12 in which a driving half nut 13 is mounted for vertical sliding movement and is restrained against lateral movements by engagement with the walls of the'recess I2. This driving member or half nut 13 is provided at its upper surface with a semi-cylindrical recess threaded for driving engagement with the threads of the driving shaft 52. An operating pin I4 is mounted for sliding movementin the coupling head, being connected at its lower end with a connecting extension of the half nut 73. The upper end of the operating pin has an operating button 15 beneath which a spiral spring 16 is compressed in such a manner as to urge the operating half nut into operative engagement with the threads of the shaft 52. This structure provides a releasable coupling in the driving connections for the carbon carriage 63. This coupling may be very readily released by pressure upon the button 15 and set again at ingly urged against the end of the core 59 so .as to yieldingly resist' the withdrawal of the carbon strip from the supply roll by friction of the disk on the core. The carbon cylinders are easily installed in operative position in the slots 54 of the end plates and easily removed therefrom. Eachspool is maintained in its normal operative position with the strip exit slot facing downwardly by means of a positioning lug 6| attached to the end of the cylinder and engaging in the slot 54. The yielding friction of the end piece 56 against the plate 44 together with a seat or depression at the inner end of the slot 55 retains the cylinder in its operative position.

The differential feeding mechanism for feeding the transfer strips forwardly at a slower speed than that of the record strips includes a rotatable threaded driving shaft or rod G2'rotatably mounted, one end in a bearing 63 connected to an angular bearing block 64, having a second bearing 65 for the outer end of an integral extension 56- of the driving .shaft. 28 of the pin feed mechanism for feedin" the record strips. Intermeshing bevelled gears 51 firmly mounted upon the shaft extension 55 and the threaded shaft 62 provide for transmission of driving force from the feed shaft 28' to the threaded driving shaft 62.

The threaded part of the driving shaft 52 is operatively connected to the carbon supply carriage 43 so as to efiect feeding movement thereof to feed the carbon strips slowly toward the any desired operating position along the length of the operating threads of the shaft 52.

An assembly of record strips S adapted for being fed in the machine above described is shown in Fig. 8. There may be as many strips S in the assembly as desired and the strips are. provided with apertured feed bands 8' along-each of the longitudinal marginal portions thereof for engagement withthe feed pins 34. The complete strip assembly is' for convenience zigzag folded along transverse lines into zigzag folded supply pad S Each strip S is ordinarily provided with longitudinally spaced trans= verse weakened severance lines S formed by perforations, scores, slits or the'like along which the strip may be severed into form sheets or leaves, each having a blank form 8*.

An illustrative embodiment of the invention having been fully set forth above, the operation will be briefly reviewed. The record strips S are led from the zigzag supply pad S over the carbon cylinders or housings 45 which thus act as strip guides, and thence to the guid g channels between the guiding plates 42 on the Ver tically movable platen frame. At the same time the carbon strips C, in this instance two, are led from the supply rolls 46v in the housings t5 and interleavedv in transfer relation with the record strips. These interleaved record and transfer strips are then led from the guiding channels in loose condition upwardly "over the V of the platen.

feeding the record strips forwardly step by step in the usual manner. During this operation of threaded driving connection between the driving shaft 62 and the half nut 13, the feed of the carbon carriage and the carbon strips C will be very slow as compared with the feeding move-' ment of the record strips. In the embodiment shown the carbon strips, will be fed forwardly a distance substantially equal to the pitch of the threads of the driving shaft 62 at each complete revolution thereof. Although this feeding movement of the carbon strips is very slow it is suflicient to keep fresh transfer material in transfer position at all times at the platen l6 clear, legible transfer inscriptions are thus assured. Although the forward parts of the carbon strips are not positively fed into inscription position the friction of the feeding record strips upon these portions of the carbon strips is sufllcient to carry the latter forwardly simultaneously with record strip feed to effect the feeding adjustment of the carbon strips at the platen. The record and carbon strips are not pressed tightly together at the platen and at the writing line thereof, being sufficiently loose at this point to permit the record strips to move forwardly with reference to the carbon strips, relative sliding movement of the record strips over the carbon strips occurring during this feeding. In this connection it'will be noted that the record and transfer strips will be maintainedin sumciently loose condition at the writing platen and at the writing line thereof to permit the record strips to advance relatively to the transfer strips without imposing undue stresses upon the latter such as would tend to tear or othertion, chief of which are the tractor feed mechathe strips may be severed to remove the end poring of the one time type in which the paper is very thin, severance of the depleted ends can be effected quite readily at the time of severance of the record strips on the weakened lines S In order to permit the forward ends of the carbon strips to be moved forwardly so that they can be severed, the carbon carriage 43 can be moved forwardly upon the supporting rails 48 by releasing the threaded driving coupling. This can be easily accomplished by depressing the operating button 45 to disengage the threads of the half nut 13 with the threads of the driving shaft 62. After severance of the carbon strips the carbon carriage 43 will then be retracted to its rearward position as shown in Fig. 4, the threaded coupling. of course, being released. During this rearward movement of the carbon carriage the forward ends of the carbon strips will be stopped abreast of the platen i6 by pressing the strips against the platen surface. During the remain der of the rearward movement of the carbon car-- riage the carbon strips C will be fed from the supply rolls 46 appropriate tension being maintained by the frictional engagement of the disks nism positioned beyond the platen and the strip guiding plates 42 between the strips opposite to the platen from the strip feed mechanism. The tractive eflort or pull of the feed mechanism on the record strips is directed longitudinally substantially along the length of the writing surface of the platen l6 and so nearly parallel thereto as to avoid undue strip pressure with consequent strip friction at the writing surface, while at the same time the strips are sufficiently close together at the writing line to assure good legible transfer inscription. Also the guide plates 42 are positioned closely adjacent to the opposite side of the platen from the strip feed mechanism between the strips, thus further promoting this loose condition of the record and transfer strips at the platen so as to avoid the dimculty mentioned with reference to undue friction between the strips at the writing surface of the platen such as would impede the differential feeding movements of the record and transfer strips at said writing surface and writing line As soonas the typing is completed on a set of record form sheets the inscribed sheets may be severed from the complete record assembly along the weakened severance lines 8.

When it isdesired to severthe used and depleted end portions of the carbon strips C, these strips may be fed forwardly with the record strips and the used ends severed at the time of severing the record strips along the weakened lines S or 58 of the housing against the end of thecore 59. Ordinarily, as shown the carbon strips will be slightly narrower than the record strips so that the longitudinal marginal portions ofthe carbons do not overlapthe feeding bands S of the record strips. I

When it is desired to renew the supply of carbon strip in any one of the housings 45 this may be very quickly and easily accomplished by removing the housing from its support in the carriage 43, whereupon the end piece or cover 58 can be takenofl' and a new supply inserted into the housing. When the housing cylinder is replaced its position with its exit slot 52 in downward position will be determined by engagement of the positioning lug 6| in the slot 54 of the supporting end bracket. Since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a machine of the character described, in combination, a platen, means positioned beyond said platen in the direction of strip feed for feeding record strips into inscription receiving position on said platen, a transfer strip supply carriage mounted for movement toward and from said platen, a rotary threaded driving rod hav.- ing threaded driving connection with said carriage, drivingconnections for driving said threaded rod by operation of said record strip feeding means so as to cause feeding movement of the transfer strip differentially with reference to record strip feed, and releasing means for said driving connection for setting the same in different driving positions along said threaded rod.

2. Ina machine of the character described, in combination, a platen, means positioned beyond said platen in the direction of strip feed for feeding record strips-into inscription receiving position on said platen, a transfer strip supply carriage, means for mounting said carriage for movement toward and from said platen and ineluding spaced supporting rails with racks, pinions engaging said racks and mounted for unitary rotation on said carriage for maintaining the transfer strip in alignment with the record strips, a rotary threaded driving -rod having threaded driving connection with said carriage,

and driving connections for driving said threaded rod by operation of said record strip feeding means so as to cause feeding movement of the transfer strip differentially with reference to record strip feed.

3. In a machine of the character described, in combination, a platen, means for feeding record I strips into inscription receiving position on said platen, a transfer strip supply carriage having one or more carbon strip supply housing extending transversely of the carriage and forming record strip guides for guiding the strips into writing position, means for mounting said carriage for movementtoward and from said platen and including spaced supporting rails'with racks inclined downwardly toward the platen, .pinions engaging said racks and mounted on the carriage *for unitary rotation, a rotary threaded driving rod having threaded driving connection with said carriage,- and driving connections for driving said 4' threaded rod by operation of said. record strip I said platen, a rotary threaded driving rod having I 0 threaded'driving connection'with said carriage, driving connections for driving said threaded rod by operation of said record strip feeding means so as to cause feeding movement of the transfer strip differentially with reference to record strip feed, and releasing means'for said threaded driv-' ing connection for setting the same in different driving positions along said rod, said releasing means for said driving connection including a coupling head connected to said supporting carriage, a threaded member mounted for movement to and from driving engagement with the threads of said driving rod, and controlling connections on said coupling head for controlling the coupling and uncoupling movements of said movable threaded member.

Louis F. HAGEMAN.

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