US1955578A - Typewriting machine - Google Patents

Description

A ril 17, 1934. c. w. CRUMRINE TYPEWRITING MACHINE 2 Sheets-Sheet 1 Filed Sept. 50, 1951 INVENTOR CHE STER l/V. (RU/4H ATTORNEY Patented Apr. 17, 1934 NITED STATES PATENT OFFICE TYPEWRITING MACHINE Application September 30, 1931, Serial No. 565,998

4 Claims.

This invention relates to improvements in typewriting machines, and particularly to the paper feeding devices of such machines, and the principal object of the invention is the provision of simple, inexpensive and efficient means for feeding small work sheets, such as cards or narrow strips, past the printing line on the platen while moving all parts of the work sheet in parallel paths substantially perpendicular to said printing line on the platen.

Another object of the invention is the provision of a type guide and ribbon guide spaced from the front of the platen, and paper feeding devices comprising an apron and feed rolls arranged below the printing line and releasable from the front of the platen so that a card or other work sheet can be conveniently inserted from the front of the platen between it and the paper feed devices, means being also provided for retaining the means for releasing said rolls and apron in releasing position, a greater extent of movement being provided for the ribbon vibrator so that it moves out of the path of -a sheet being inserted from the front.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear from the following description when read in conjunction with the accompanying drawings, the novel features being pointed out in the claims at the end of the specification.

In the drawings: Fig. 1 is a fragmentary transverse section of so much of a typewriting machine as is necessary to illustrate one possible embodiment of the invention;

Fig. 2 is an inverted plan view of the paper feeding devices; 7 I

' Fig. 3 is a fragmentary transverse sectional view of devices shown in Fig. 1, but showing the front paper feed rolls released from the platen,

and

Fig. 4 is a fragmentary end elevation of the carriage.

Referring particularly to the drawings, the invention is illustrated applied to a power operated typewriting machine of well known type and comprising a revoluble platen 1 mounted in the frame of a carriage'2 which is mounted fonmovement transversely of the frame 3 of the machine on antifriction bearings 4 arranged in guideways provided therefor inthe carriage and frame of the machine.

Type bars 5 are pivoted in a .ype basket 6 in the frame of the machine and are provided with types 7 adjacent their free ends adapted to engage the platen or the Work sheet thereon when the type bars are swung on their pivots. Power driven devices are provided for operating the type bars or other printing instrumentalities of the machine. form of hell crank levers 8 pivoted on a common pivot rod 9 and having one arm connected with an arm of a bell crank lever 11 by means of the link 12. The bell crank lever 11 is pivoted on the common pivot rod 13 and its other arm 14 is connected with the free end of a toggle lever 15 by means of a link 16 The lever 15 is pivoted to the arm 16 of the type bar, and at its other end is pivotally connected with the free end of a toggle link 17 pivoted on a fixed part of the frame. A spring 18 connects the arm 14 of the bell crank with a fixed part of the frame and resiliently maintains the parts in the normal position shown in Fig. 1 of the drawings, in which the type bar is retracted and the toggle 15, 17 in straightened position. When the actuator lever 8 is swung to pull the link 12, it operates to swing the lever 15 in a direction to break the toggle and swing the type bar into printing engagement with the platen.

. The bell crank 8 has an arm 19 projecting downwardly, on the free end of which a cam 21 is revolubly mounted adjacent the surface of a power driven roller 22. A spring-pressed arm 23 engages a lug 24 on the cam and tends to swing 35 it on its pivot into engagement with the roller or a projection 20 thereon into engagement with a stop 25 on a detent lever 26 pivoted on the bell crank 8. At its upper end, the lever 26 has a lateral projection whereby itis engaged by the slotted end of an arm 27 projecting downwardly from a key lever 28. The key lever is pivoted on the common pivot rod 13 and has a key 29 whereby it may be manually operated. A spring 31 connects the key lever with a fixed part and resiliently maintains the key lever and parts connected therewith in: the normal position shown in Fig. 1. When the key is depressed, it swings the detent lever to move its stop 25 out of the pathof the projection 20 and permits the cam to turn under the action of the arm 23 into engagement with the roller. The cam is then rotated by the roller and swings the lever 8 to swing the bell crank 11, which swings the type bar into engagement with the platen. The parts thus far described are or may be of usual construction and form no part of the present invention except as they enter into combination therewith.

A type guide 32 projects upwardly and rear- Said devices comprise actuators in the mounted in the frame.

wardly from the type basket to a point adjacent the printing point on the platen. A ribbon vibrator 33 is slidably mounted on the type guide to move to and from a point to interpose the ribbon over the printing point on the platen in a well known manner. The ribbon vibrator is automatically operated by the devices which operate the type bars and has a downwardly projecting arm 34 whereby it is pivotally mounted onthe free end of an arm 35-pivotally mounted on a fixed part of the frame. A stop 36 projects upwardly from the frame of the machine into the path of the arm 35 and limits its movement in a downward direction. A link 37 is pivoted to the arm 35 and connects it with a stud 38 arranged in a three-armed slot in an actuator 39 pivoted on a fixed part of the frame. The actuator 39 is operatively connected with a universal bar 41 by means of a link 42 which is pivotally connected to an arm 43 projecting rearwardly from the bar 41 and having a downwardly projecting arm 44 which is connected with a fixed part by means of a spring 45. The universal bar is pivoted on a fixed part and resiliently engages arms 46 on the bell cranks 11 under the action of the spring 45. When one of the bell crank levers 11 is actuated to operate a type bar, it swings the universal bar against the tension of the spring 45 to swing the actuator 39, and through the link 37 moves the ribbon vibrator to. the printing point.

The stud 38 is manually adjustable in its slot to vary the extent of movement imparted to the vibrator to move different parts of a bichrome ribbon to the printing point or to. silence the.rib-' bon vibrator when stenciling operations are being performed. To this end, a link 48 is con-- nected with the stud 38 at one end, and at itsother end is pivoted to an arm 49 fixed on a rock shaft 51 which is revolubly mounted in the frame. A second arm 52 is fixed on the rock shaft and pivotally connected with a push rod 53 slidably At its forward end, the push rod has a button 54 secured thereto by which it may be manually operated. A detent 55 is fixed on the frame and resiliently engages one or another of a plurality of projections 56 on the 'rod for resiliently retaining it in adjusted position. Assuming that the parts are adjusted for moving the vibratorto print from the black portion of the ribbon, as shown in Fig. 1, a pull on the rod 53 adjusts the stud 38 farther from the axial center of the actuator so that greater extent of movement is imparted to the vibrator to move the lower or red portion of the ribbon to the printing point. If, however, the rod 53 is pushed inwardly from the position shown in Fig. 1,the stud is moved into the curved portion of the slot in the actuator, and movement of the actuator is not imparted to the vibrator as when performing stencilling operations. It will be noted that the type guide and ribbon vibrator are spaced at some distance from the front of the platen and below the printing point thereon to provide a wide clearance for a work sheet or a plurality of work sheets with carbons arranged between them to be inserted at the front of the platen. In the Paper feeding devices are provided which dooperate with the bottom and front side of the platen and are manually movable from the front of the platen to receive the work sheet. Said paper feeding devices comprise a frame having curved end members 61 and 62 which are secured intermediate their front and rear ends to the opposite ends of a rod 63 extending longitudinally of the platen and arranged beneath the same. The rod 63 is seated in a slot provided therefor in an arm 64 projecting rearwardly from a rock shaft 65 mounted in the carriage frame at a point substantially midway between the ends of the platen and engages the rod 63 at a, point substantially midway between the end members 61 and 62. At one end, the left hand end as shown in the drawings, the rock shaft 65 projects through the end member 66 of the carriage in which it has a bearing, and at its outer end has an arm 67 secured thereto. The arm 64 and feed roll frame are held in operative position as in Fig. 1 by means of spring 80 secured at one end to the rock shaft 65 and at its other end to the'end member 66 of the carriage. The arm 67 is pivotally connected with the end of a piece 69. Intermediate its ends, the lever 68 is pivotally connected with a link '71 pivotally mounted on the end member 66 of the carriage frame.

Revolubly mounted on the arms 61 and 62 adjacent their rear ends and extending between them is a rear feed roller 72. The feed roller 72 preferably comprises a plurality of relatively short sections, as shown, which are adapted to project through openings in a paper apron 73 into engagement with the platen. The feed roller is mounted on a shaft -'74 which turns on cone bearings 75 adjustably mounted on the end members 61 and 62 and projecting inwardly therefrom. A front feed roller 76 also comprises a plurality of sections adapted to engage the platen through openings in the apron 73, which are mounted on a shaft 77 which is revolubly mounted on cone bearings on the end members 61 and 62 in a manner similar to the rear feed roll shaft 74. The paper apron 73 is fixedly secured to the upper sides of the end members 61 and 62, so as to be arranged between said members and the surface of the platen and extends upwardly at the front of the platen and terminates at a point below the printing point. A spring '78 is coiled about the rod 63 and has .hand lever 68 which is providedwith a finger one end anchored on the arm 64 and at its other end engages the paper apron and tends to press the paper apron and with it the feed rolls into engagement with the platen, as seen in Fig. 1. It will be noted that by this arrangement, the frame in which the paper feeding devices are mounted is supported by a single means at a point adjacent its center, that is, substantially midway between its ends and sides so that'either end or side may yield against the tension of the spring away from the platen under the influence of the work sheet engaged thereby while other parts may engage the platen. The spring engages the frame at a point substantially intermediate the rod 63 and the shaft for the rear feed rolls so that when the arm 64 is moved away from the platen, thus releasing the pressure on the rod, the front part of the frame with the front feed rolls swings away from the platen to the position shown in Fig. 3 about the axis of the rear feed rolls as a center, which are retained in contact with the platen under the tension of the spring.

When a sheet is to be inserted on the platen, the lever 68 is swung forwardly to swing the arm 67 downwardly and with it the arm 64 to release the front feed rolls and permit them and the front of the paper apron to swing away from the platen to the position shown in Fig. 3, in which one or a plurality of superimposed work sheets may readily be inserted from behind the type guide and ribbon vibrator between them and the platen. During such forward movement of the finger piece, the arm 71 swings forwardly until the pivotal points of the lever 68 reach a position alined with its axis, in which position they are retained and lock, the front feed rolls in a position released from the platen. Thus it will be noted that the arm 71 cooperates with the lever 68 to form in effect a toggle which moves to the straight position when the rock shaft is actuated to release the front feed rolls from the platen and serves to retain said rolls in released position. When the lever 68 is again actuated, it breaks the toggle and permits the feed rolls to reengage the platen. A stop 79 fixed in the carriage end member 66 may be arranged in the path of the lever 68 to limit its movement in one direction.

It will be noted that the devices herein described provide simple and convenient means for feeding short work sheets, such as cards or invoices, which may be inserted at the front of the platen betweenlthe front feed rolls and the platen and which are then fed forwardly in substantially straight lines past the printing point.

Although only one embodiment of the invention is shown and described herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claims.

I claim:

1. In a typewriting machine'having a frame and a carriage thereon, the combination of a platen revolubly mounted in the carriage, a rigid rod extending longitudinally of the carriage beneath the platen, a pair of oppositely projecting arms on each end of said rod, a paper apron connecting and mounted on 'said arms and arranged adjacent the bottom and front sides of the platen, a single pivoted arm on which said rod is mounted, resilient means cooperating with said arm and engaging said apron at a point in rear of the rod for pressing the apron toward the platen, and means for swinging said arm to release the front side of the paper apron to permit it to swing away from the platen while its rear portion is resiliently pressed toward the platen.

2. In a typewriting machine having a frame and a carriage thereon, the combination of a platen revolubly mounted in the carriage, a frame extending longitudinally of the carriage beneath the platen and comprising a rigid rod, front and rear feed rolls revolubly mounted in said frame, an arm in which said rod is loosely seated, resilient means cooperating with said arm and engaging said frame for pressing the frame toward the platen to engage the feed rolls therewith, and manually operated means for swinging said arm to release the'pressure of said resilient means from the front of the frame to permit the frame to swing to move the front feed rolls from the platen while maintaining the rear feed rolls in engagement therewith.

3 In a typewriting machine having a frame anda carriage thereon, the combination of a platen revolubly mounted in the carriage, a rigid rod extending longitudinally of the carriage beneath the platen, transversely arranged arms on the ends of said rod and rigidly connected therewith, front and rear feed rolls revolubly mounted in said arms, a paper apron connecting said arms and secured thereto and provided with 100 openings through which the feed rolls project into engagement with the platen, an arm on which said rod is loosely seated, resilient means cooperating with said arm and engaging the paper apron to press the feed rolls into engagement with the platen, and manually operated means for swinging said arm to release the pressure of said resilient means from the front of the apron to permit said arms to swing about the axis of the rear feed rolls to move the front feed rolls from engagement with the platen.

ings through which the feed rolls engage the platen, a rock shaft on the carriage, an arm fixed to the rock shaft in which said rod is loosely seated, said rod being engaged by the arm at a point substantially equidistant from said first mentioned arms and between the same, resilient means engaging said apron and cooperating with said arm for resiliently pressing the feed rolls into engagement with the platen, and manually operated means for turning said rock shaft to swing the arm away from the platen to release 3 the pressure on the frontfeed rolls to permit them to move away from the platen.

CHESTER W. CRUMRINE.

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