US 1478380 A
Description (OCR text may contain errors)
Dec. 25, 1923.
' 1,478,380 M. c. CRAWLEY TYPEWRIT I NG MACHINE Filed July 25 1,922 5 SheetsSheet 1 ATTORNEYS Dec. 25, 1923.
Sheets-Sheet 3 INVENTOR ATTORNEYJ Emma.
M. C. CRAWLEY TYPEWRITING' MACHINE Filed July 25 I N Q NAN E Dec. 25, 1923. 7 0
I M. C. CRAWLEY I TYPEWRITING MACHINE Filed July 25 .922 3 She ets-Sheet 5' v a vI ATTORNEYS Patented Dec. 25, 1923.
UNITED STATES PATENT OFFICE.
MANSFIELD C. CRAWLEY, OF GROTON, NEW YORK, ASSIGNOE TO ADDOGRAPH COM- PANY, LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.
Application filed July 25,
i Tompkins, and State of New York, have in vented certain new and useful Improvements in Typewriting Machines, of which the following is a full and clear specification.
The object of this invention is to provide 2 a simple roller arrangement for clamping the sheet to the platenroll in such manner as to smoothly and accurately feed the paper with the platen-roll, simple means being provided for throwing the rolls off and on, as
more fully hereinafter set forth.
In the drawing- 7 Fig. 1 is a bottom view showing the rolls in the off position;
Fig. 2 is a similar view with the rolls in the on position;
Fig. 3 is a front view showing the rolls in working position;
Fig. 4 is a vertical sectional view showing the rolls in clamping relation to the work sheet on the platen;
Fig. 5 is a view similar to Fig. 4 showing the rolls in the off position;
Fig. 6 is a detail perspective View of one of the pairs of rolls;
Figs. 7 and 8 are views of details hereinafter described; and
Figs. 9 to 13 inclusive are views of additional details hereinafter described.
Referring to the drawings annexed by reference characters 10 designates the platen roll journaled in the side plates 11 of a platen shift frame, these side plates being mounted on the forward ends of two pairs of parallel links 12 connected to the platen carriage at their rear ends. The numeral 13 designates the usual sheet metal paper-apron or guide extending around under the platen and provided with the usual openings for the underside pressure rolls 14, said apron being rigidly connected to plates 11 by arms 43 and 44.
Connecting the side plates 11 is a rod 15 arranged under the platen and adapted to afford support for the pressure rollers and the throw-off bar hereinafter described. The rolls 14 are arranged in pairs, each roll having its pintles 16 restingin notches 17 formed in arms 18 pivotally mounted on the aforesaid rod 15. Each pair of arms 18 is connected by a bar 19, and each pair of roll- 1922. Serial No. 577,359.
supporting arms is normally pressed toward the platen surface by means of a coil spring 20, this spring surrounding the rod 15 at a point about midway between the arms 18 and having its two free end portions 20 hooked to the respective bars 19 to thereby uniformly press the two tandem rolls of each pair toward the platen.
Each of the arms 18, at a point under the rod 15, is provided with a depending booklike cam lug 22, the lower hook part of each adjacent pair of lugs extending in opposite directions fore and aft of the machine and each having an upwardly-facing shoulder. Supported on the shoulders of these hooks is a bar 23 extending transversely of the machine, the engagement with the bar being by means of a longitudinal cam slot 24 in the bar for each pair of hooks, each slot having a narrow portion at one end and a widened portion at its other end, the walls of these two portions of the slot being parallel and connected by the inclined walls 24. With this arrangement of slots, it will be seen that when the bar 23 is pushed in one direction each pair of depending hooks will enter the narrow portions of the slots, and when the bar is pushed in the opposite direction these hooks will enter the wider portions of the slots. When the hooks slide into the narrow portions of the slots, the hooks of each pair are brought into overlapped relation, thus rotating the roller-carrying frames on the shaft 15 in a direction away from the platen, to thereby move the rolls to off position, as shown in Figs. 2 and 5. When the bar is adjusted to bring the hooks into the wider portions of the slots, the hooks are allowed to spread apart, as shown in Fig. 4, suiiiciently to permit the springs 20 to force rolls 14 against the platen. In this simple manner, all the rolls may be quickly and simultaneously shifted to off or on position. As a simple means for reciprocating the bar 23 endwise transversely of the machine, I pivot a bell-crank lever 25 at on a lug 46 carried by one of the side plates 11, one end of this bell-crank being pivotally connected by means of a screw pivot 26 to one end of the bar 23 and its other end having a slot 47 in which engages the lower end of an upstanding finger lever 27, this finger lever being ivoted at 28 to the adjacent side plate 11.
swinging the finger lever 27 forwardly the rolls 14 are thrown to off position, and by swinging it backward the rolls are restored to workingposition. The rolls will remain in oil position when lever 27 is moved forward and released, owing to the frictional engagement of hooks 22 with the oppositelyfacing parallel tacos ot the narrow parts of the camslots 24, thereby avoidingthe necessity of using extraneous locking means. It will be observed also that the hooks are always in interlocking engagement with the actuator-bar 23 and,.turther, that the actuatorbar is practically entirely suspended on the hooks, the only additionalsupport being the bell-crank 25 which affords a support for one end 01 the bar. This construction contributes greatly to simplicity as well as certainty of operation.
A scale bar 29 is supporteo in front ofthe platen on the upper ends ot'a pair or arms 30 pivotally supported at their lower ends upon ears 31 extending forwardly from the side plates 11. i The scale bar 29 is rigidly held. to arms 30 and has its upper edge curved rearwardly so as to stilien the same and also form a housing for a series or sleeve-like metal rollers 32 rotativel'y mounted on a stationar rod 33 ii idl. connectin a l h the arms 30. A coil spring 34L normally tends to pull the upper ends of the arms toward the platen to thereby keep the rolls 32 inworking relation with the platen.
By swinging the scale bar 29 forwardly far enough to carry the coil springs 34: over the centers of thepivot screws 36 of the arms 30, the scale bar will come to rest at a considerable distance from the platen, as shown in dotted lines in Fig. 5, this position being maintained by reason'ot the contact of lingers 37, carried by thearm's 30, with lugs 38 on theiside plates 11. This tar-0H adjustment of the scale bar is desirable in making certain adjustments of the work sheets, but when it is desirable merely to throw the rolls 32 away from the platen to release the work sheets this may be accomplished simultaneously with the throwing 0H 01 the under rolls 1 1, by interposing between the throw-off lever 27 and the adjacent side arm. 30 a bar 39 slidably mounted on two screws 40 tapped into the adjacent side plate 11. With this arrangement, when the throw-ofli lever is thrown forwardly to throw ofi the main rolls 1 1, the bar 39 will be pushed forwardly far enough to. release the front rolls 32, as shown in Figs. 5 and 9. In this case it will, of course, be understood that the springs 3d are not carried far enough forwardly to pass. over the centers of the pivot screws 36, so that the springs 34: will tend to hold the arm'30 against the forward end of the bar 39. When lever 27-is thrown back to restore rolls 1a springs 34- will restore the'rolls 321 and force. slide rearward at the, same time.
any suitable. means maybe employed for preventing the roller-carrying arms 18 slid ing on the rod 15, but I prefer to accomplish this purpose by striking up lugs 41 from the sheet metal paper apron 13, these lugs being positioned to slidingly engage the side faces of the arms 18. It is desirable also to brace the long rod 33 with respect to the scale bar 29. For this purpose I fasten to the rod, at suitable intervals, small sheet metal brackets 12, as shown in Figs. 11 and 13, and shape the upper and rear edges of these brackets to abut against the inner curved face of the bent scale bar. To tasten these bracing brackets to the rod T provide each with a' rounded notch in which the shaft fits, and crimp the brackets rigidly upon the shaft. The channel} scale bar 29 is mounted on the arms 30, a desirable way of doing this being to make the arms and the scale bar of sheet metal and form them integral, the arms being formed on the ends of the bar and, bent so asto lie at right angles to the bar.
hat I claim is:
1. A paper-feeding mechanism for typewriting machines consisting of pairs of rollcarrying pivoted arms each having a depending hook-lug, a spring for each pair of arms adapted to normally toreetherolls toward the platen, a bar and means for shifting it longitudinally of the platem'said bar being provided with a plurality of longitudinal cam-slots each of which is wider at one end than at the other and each of which engages a pair of hooks on the roll-carrying arms.
2. In combination with a typewriting machine, a paper-feeding mechanism embodying a plurality of pairs of roll-carrying arms, depending lugs carried bythese arms, springs for normally swinging the roll carrying ends of the arms toward the platen, and a reciprocable bar for sinnil'taneously actuating saidlngs, said bar being supported on said lugs.
3. A paper-feed mechanism for platen consisting 01 a rod supported below the platen, roll-carrying arms pivotally mounted on said rod, spring means tor forcing said roll-carrying arms toward the platen, each of said arms being provided with a depending hook having an upwardly tacinr shoulder, a reciprocable bar provided witn a cam-slot for each pair of said hooks, said bar being supported on said shoulders.
4. In a paperdieed tor roll-platens, a p1urality of roll-carrying frames and means for normally pressing them'toward the platen,
each of said frames being provided with a cam lug, and a reciprocable bar provided with longitudinal cam-slots for interlocking engagement with saidlugs to forcibly. withd a the; o l twin the p ten.
5. a typewritingi machine a paper feed mechanism embodyi g a er Of und r r0118 and means for throwing them OE and on embodyin an upstanding lever, a front roll pivoted to swing back and forth eet to the platen, and means interposed between said throw-off lever and said f ont oil structure to cause the front rolls thrown off when said lever is actuated to throw ed t ie under rolls, said means con- ,L J: J1, 'l SlS'e i 5 or a rore-and-ait slidable oar mounted on one of the side-plates of the platen frame and having abutting relation at one end with said upstanding lever and abutting relation the other end with said front roll structure.
6. in typewriting machine, a paper feed mechanism embodying a series of under rolls and means for throwing them off and on embodying an upstanding lever, a front roll structure pivoted to swing heel: and forth with respect to the platen, and means intered between said throw-ofi? lever and said *ont roll structure to cause the front rolls to 'e thrown off when said lever is actuated to hrow off the under rolls, said means emodying slidable bar mounted on the platen ltlllle.
T. in a paper feed mechanism for typewriting machines, a front feed roll structure embodying a pair of arms pivoted in a ilaten frame, a rod connecting these arms, a chanr scale bar mounted on the arms, a
is of bracing brackets atlixed to the rod and abutting the inner face of the scale bar.
8. n a typewriting machine, a platen frame carrying a roll-platen, a rod mounted on said frame and extending along underneath the platen, a plurality of feed-rolls mounted on arms pivoted on said rod, spring means for normally swinging said rollcariying arms toward the platen, means for forci swinging said feedrolls away from the 1 (en and holding them away, this latter means embodying lugs projecting from said roll-carrying arms, a reciprocable bar lying parallel with the aforesaid rod and provided with cam-faces for engagement with said lugs, some of said cam-faces being arranged to face rearwardly and the other cam-faces being arranged to face forwardly, and devices for endwisely reciprocating said bar.
9. A paper feed mechanism for typewriting machines embodying a front roll structure consisting of a pair of arms pivotally mounted on the platen frame, a scale bar connecting said arms and formed integral therewith, the upper edge of said scale bar being bent rearwardly to form a housing and a rod connecting said arms and carrying rolls lying within said housing.
10. In a paper-feed for roll-platens, a plurality of roll-carrying frames and means for normally pressing them toward the platen, each of said frames being provided with a cam-lug, and a reciprocable bar provided with longitudinal cam-slots for engaging said lugs to forcibly withdraw the rolls from the platen, said cam-slots each consisting of two parts one narrower than the other, the walls of the narrower part being so shaped as to frictionally hold the camlugs when they are forced into said narrower part and thus lock the rolls in off position.
11. In a typewriting machine, a platen roll and frame, forwardly-extending and rearwardly-extending f e e d-r o l l-carrying pivoted arms and spring means for normally forcing the roll-carrying ends of the arms toward. the platen, cam-lugs projecting from both sets of arms, and means for swinging the roll-carrying ends of the arms away from the platen through the medium of said cam-lugs against the action of said spring means, embodying a bar lying under the platen-roll and parallel therewith and adapted to be endwisely shifted, said bar being provided with pairs of oppositelyfacing cam-faces positioned to engage and swing the lugs carried by the forwardlyex tending roll-carrying arms in one direction and the lugs carried by the other set of rollcarrying arms in the opposite direction.
In testimony whereof, I hereunto affix my signature.
MANSFIELD C. CRAl VLEY.