US1433935A - Typewriting machine - Google Patents

Description

e. w. CAMPBELL.

TYIEWRITING MACHINE.

APPLICATION FILED JAN. 1|, 192|.

15,433,935., 'muted m3191922 N 2 SHEETS-SHED l. f /77/ G. W. CAMPBELL.

TYPEWRITING MACHINE. APPLICATION FILED JAN.11.1921.

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l Patented-Get.. 3l, 1922.

muren s'rn'rrt-sv Y rnxrlirrl OFFICE.

GEORGE W. CAMPBELL, 0F HARTFORD, CONNECTICUT, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWMTING MACHINE.

Application filed January 11, 1921. Serial No. 436,431.

down to receive impressions from the other,

types. p

A feature of the invent-ion comprises a novel form of loc-king or holding means, which may co-operate with the shift-frame,

to ret-ain the platen in its normal position; i the holding means being operable by the shift-keys to release. the shift-frame.

Another feat-ure resides in spring mechanism to restore the shift-frame to, and hold it in, normal position. I

Still another featurel relates to means to maintain a permanent connection between the shiftlframe and the guide-arm therefor.

A further feature of the invention resides in the bearings .for a rock-shaft of the caseshifting mechanism. i

Other features and advantages will hereinafter appear. f

kIn the accompanying drawings,

Figure `1 is an elevation of the machine, as seen from the left-hand side of the ma.- chine, parts being broken away to show the interior structure. f v

Figure 2 is a. fragmentary side elevation, showing the shift-frame moved to its lower position by the depression of one of the shiftkeys.

Figure 3 shows the shift-frame moved to its upper position by the other key.

Figure 4 is a view o-f the shift-key lever actions Figure 5 is a top plan view of the machine, showing the case-sl1ifting mechanism; the carriage being removed. fw

Figure 6 is a. detail. sectional view, taken o n the line 6-6 of Figure 3', and shows the is a view similar to Figure 2, and' latch fon maintaining the connection between the shift-frame and one of the guidearms. Y

F 'igure' 7 is adetail sectional view, taken on the line 7--7 of Figure 3, and shows the manner of fastening the spring mechanism for the shift-frame. d

Figure 8 is a det-ail'sectional View, taken on the line 8 of Figure 2, and shows one of the end bearings for the rock-shaft. of the oase-shifting mechanism. i.

Figure 9 is a diagrammatic` side view, showing the holding mea-ns operated by one of the shift-keys to release the shift-frame before the latter is moved to its lower position. I'-

Figure 10 is a similar view, and shows the locking means operated by the other shiftkey to release the shift-frame before it 'is raised to its upper position.

@The invention is herein shown as applied to an Underwood portable typewriter, disclosed inthe 1,297,085, dated arch 11, 1919, an nin the patent to Dobson, No. 1,335,956, dated Aprill 6, 1920. Each type-bar 10 is provided `with three types 11, 12 andw13 to print against the front of ay platen '14 when the latter. is

atent to Burridcre, No.

in upper, middle, and lower position, respecf' tively. The type-bars 10 may be operated by keys `(not shown.) fThe platen is sup- `ported" in a carriage 15 which moves lia/ck and forth on rails 16 and 16a, forming' part of a shift-frame 17, having end plates-18I and 19 (Figures 1 and 5). The shift-frame 17 is mounted for up-and-down movement in a main framel 2l, the latter comp-rising side plates 22 and 23 joined to each other by cross-bars 24' and 25. The shift-frame 17 is guided relatively to the main frame 21 by links 26 and 27 pivotally mounted on the side lates 22 and 23, respectively, at 28. The links extend forward and are connected to the end plates 18l and 19 of the shift-frame by screws 30 and 31. To assist in guiding 32 and 33 are provided, one at each side of the machine. These arms extend forwardly the shift-frame in its movements, two arms 38 in the end plates of the shift-frame.

To ac-tuate the shift-frame 17, there may be connected therewith an operating arm 40 permanently secured to and extending forwardly from the rock-shaft 34. The forward end of the operating arm 4() is provided with a lateralv projection or lip 41 (Figures 3, 5 and 1G), which may be engaged, when it is'desired to shift the platen vfrom middle to upper position, by a rearwardly-extending arm 42 of a shift-key lever 43 pivoted at 44 on a bracket 45 secured to the cross-bar 25 of the main frame 21. The lever 43 may be depressed by a key 46 thereon, and is provided with a return spring 47 connected to an extension 49 of the lever, said extension engaging with the cross-bar 25 when the shift-key is in its normal posit-ion (Figures' 1 and 4).

To shift the platen from middle to lower position, there is provided a vshifteke-y 48, mounted on the forward end of a shift-lever 50, pivoted at 51 on a bracket 52 secured to the crossbar 24 (Figures 1, 4 and 5). The key-lever 50. has pivotally mounted thereon at 52a an intermediate lever 53, one end 54 thereof engaging the cross-bar 25, the 'latter serving as an abutment or fulcrum-plate for the intermediate lever. When the key-lever 50 is depressed; the rear end 55 of the in- `termediatek lever 53, moves downwardly to actuate the operating arm 40 and rock the shaft 34 in a clockwise direction, thus lowering the forward ends of the guide- arms 32 and 33, and, consequently, the shift-frame 17. The key-lever 50 and intermediate lever 53 are provided with a returnspring 55"L connectedh to the bracket' 52 and to the forward arm of the intermediate lever 53.

Stops 56 and 57 are provided to limit thel store `the` shift-frame with the platen from its extreme positions to normal. The spring mechanism may comprise a wire having a loop' 60 to'l embrace the rock-shaft 34. yTwo Varms or elements 61 and 62 extend from the loop 60 and engage an' abutment' 63 on a bracket 64 secured to the side plate 22 of the main frame. The spring mechanism is located adjacent the guide-arm 32, and is'held in lace'thereon by a strap 65 secured tosai arm, Figures 3 and said strap having a groove 66 to embrace the spring arms 61 and 62. By an inspection of Figure 2, it Will be seen that the spring arm 61 is effective to restore the shift-frame. In Figure 3 the spring arm 62 is effective.

The platen 14 may be held in its middle y position by locking mechanism co-operating with the shift-frame 17. Said locking mechanism may comprise a bail 67 pivoted on the main frame 21 by screws 68 said bail having two arms 70, with projections 71, the latter engaging in openings 72 of brackets 73 on the shifteframe. rlhe brackets 73 are held in place on the shift-frame by screws 74, and are slightly adjustable (Figure 9), so as to facilitate the correct positioning of the platen in its middle position relatively to the types 12,.

The locking bail 67 is operable by the shiftkeys 46 and 48 during the initial parts of their downward movements, to release the shift-frame so that the platen may be shifted. To this end, the shift-key 46 which shifts the platen to upper position is provided with a lip 75 to engage an arm 76 secured to a cross bar 77 of the bail 67, to swing the latter about/its pivot 68 and withdraw the projections 71 from the holes 72, as seen in Figure 10. By an inspection of Figures 1 and 4, it will be seen that there is a lost motion between the arm 42 of the key-lever 43 and the operating arm 40, so that the locking bail may be moved to its ineffective position (Figure 10) before thal lkey-lever engages the operating arm to actuate the shift-frame. While the latter is released, as in Figure 10, the spring mechanism comprising the arms .61 and 62 is effective to hold the shift-frame in its middle position. A further depression of the shift-key 46, however, moves the shiftframe upwardly, againstthe tension o-f the spring arm 62, to the position indicated in Figure 3.

To 'actuate the locking bail by the other key-lever, there may be provided on the keylever 50 a follower 78 to engage a cam 80' on an arm 81 secured to the cross-bar 77 of the holding bail, to swing it to the position indicated in Figure 9. At this time lost motion between the intern'iediate lever 53 and the operating arm 40, Figures 1 and 4, will have been taken up. A. further depression of the shift-key 48 is effective to move the shift-frame to its lower position, F igure` 2, against the tension of the springr arm 61.

As hereinbeforc stated, the spring mech anism is effec-tive to restore the shift-frame cate the shift-frame in this position, afterit is returned by either one of the spring arms 61 and 62, the projections 71 on the locking bail 67 may be in the form of tapered studs that they may readily find their way into the holes 72 in the shift-frame when the locking bail is restored to normal position by means v0f a return spring 82, one end of which is connected with the locking bail, the other end being anchored on thel main frame 2l.

lt will be understood that any suitable form of locking device may be associated with the key-levers 43 and 5() to hold them, if so desired, in their operated positions; various forms of locking devices being shown in the patents to Bul-ridge and Dobson, above mentioned.

F or convenience in assembling the shiftframe 17 on the main frame 2'1, the slots 38 in the shift-frame are vertically disposed, so that it may be set in from the top of the main frame on the studs of the guide- arms 32 and 33. The guldedlnks 26 and 27 may then be connected to the shiftframe by the screws 30 and 31. It is desirable to secure the studs 37 in the slots 38 to maintain the connection between the shiftframe 17 and the operating arm 40 during case-shifting ope-rations. For this purpose, there is provided on each of the end plates 18 and 19 a latch 83. The latches (Figures 3 and 5) may be swung about their pivots i 79 to embrace the studs 37 to keep them in the slots 38. The latches may be frictionally held in position against the end plates. They may be swung rearwardly about their pivots and clear of the studs 37 in assembling or disassembling.

To reduce friction to a minimum and to facilitate the assembling of the rock-shaft 34 of the case-shift mechanism, said rockshaft may be mounted at each endron a roller bearing unit 35, as hereinbefore stated. Each unit 35 (Figure 8) may comprise a stud 84 projecting from av plate 85 secured to the main frame 21 by a screw 86. Rollers 87 are contained within the hole 36 and bear against the stud 84. The rollers 87 may be reduced at their ends 88 to project into grooves 90 and 91. The groove 90 may be formed in flange 92 of the stud 84. The groove 91 at the other ends of the rollers may be formed by the stud and a liange 93 of a disk 94, which may. be secured to `the stud in any convenient manner. Thus. there is provided the roller bearing comprising the arm or plate 85, the stud 84 and the rollers 87 which may be assembled a Single unit 35. The rollers of each unit may then be readily inserted through holes 95 in the main frame 21, and into the holes 36 at the ends of the rock-shaft 34 in assembling the latter on the main frame 21. Variations may be resorted to within the scope ofthe invention, and portions of the improvements may be used without others. Having thus described my invention, I claim: i

1. In a typewriting machine, in combination. a case-shift-frame, spring means for yieldably holding said case-shift-frame in 1ts normal position, means to lock said frame in its normal position including a shiftable frame having a tapered pin to enter an opening,r in the case-shift-frame, means for shifting the case-shift-frame from its normal position. the shifting means including a shaft, operating connections between said shaft and said case-shift-framc, an arm projecting from said shaft, a shift-key-lever, an intermediate lever pivoted on said shift-keylcver, and an abutment to engage one end of said intermediate lever so that depression of the key-lever will actuate said intermediate lever to engage said arm to shift said case-shiftframe, and cam means on said key-lever and shiftable frame whereby depression of the former will shift the latter to ineffective position.

2. In a typewriting machine, in combination, a case-shift-frame, s )ring means for yieldably holding said case-s ift-frame in its normal position, means for shifting said case-Shift-frame comprising an actuating arm connected with said shift-frame, two shift-key-levers, one of said key-levers engaging directly with said actuating arm to operate the latter to move the shift-frame in one direction from its normal position, an intermediate lever pivoted on the other keylever, an abutment for the intermediate lever, the latter engaging the actuating arm, when the associated key-lever is actuated, to move the shift-frame from its normal position in a direction opposite to that effected by the lever engaging directly with the actuating arm, and a spring to resist the turning of said intermediate lever relatively to the associated key-lever and to re turn the latter to its normal position when released. f

3. In a typewriting machine. in combination, a case-shift-frame, spring means .for yieldably holding said case-shift-frame in its normal position, shift-frame actuating means comprising an actuating arm connected with the shift-frame, a key-lever, an intermediate lever pivoted thereon, an abutment for the intermediate leve-r, the latter engaging the actuating arm to move said frame in one direction from its normal position. a spring to resist the movement of the intermediate lever relatively to the key-lever and to return the latter to normal position. a locking device to retain said ,frame in normal position to relieve the return-spring of the weight. of said frame.

means operable by the key-'lever to actuate the locking device to release said shift-frame prior to a shifting operation. and a returnspring for the locking device.

4. In case-shifting mechanism, the combination of a shift-frame, an actuating arm connected with said shift-frame, two shift keylevers, one of said levers engaging directly with said actuating arm to operate the latter to move the shift-frame upwardly from its normal position, an intermediate lever pivoted on the other key-lever, an abutment for the intermediate lever, the latter engaging the actuating arm when the associated key-lever is actuated, to move the shift-frame downwardly from its normal position, stops to limit the movements of said frame in both directions, a spring to` return said frame to normal, and a locking device controlled 'by said key-levers to hold said shift-frame in normal position.

5. In case-shiftin mechanism, the combination of a shiftrame, an actuating arm connected with said shift-frame, aYkey-lever, an intermediate lever pivoted thereon, an abutment for the intermediate lever, the latter engaging the actuating Jarm to move said frame downwardly from its normal position, a stop to limit the downward movement of said frame, a return spring for said frame, a locking device to retain said frame in normal position and to relieve the return spring of the weight ofl said frame, means operable by the key-lever to actuate the locking device to release said frame prior to a shifting operation, and a return spring for the locking device.

6. In case-shifting mechanism, the combination of a shift-frame, an actuating arm connected with saidv fra-me, a key-lever, an intermediate lever pivoted thereon, an abutment for the intermediate lever, the latter engaging-the actuating arm to move said frame downwardly from its norma-l position, a stop to limit the downward movement of s'aid frame, and a return spring for y said frame.

7. In case-shifting mechanism, the combination of a shift-frame having holes, keylevers to actuate said frame in two directions from a middle position, stops to limit the movements of said frame in both directions, a pivoted bail, tapered studs on said bail to enter the holes in said frame, arms on said bail to be engaged by said levers `to operate said bail to release said frame prior to the movement of the latter, and a spring to hold said frame in its middle position, the frame being movable against the tension' of said spring, said tapered studs being effective to accurately locate said frame when the latter is restored to its middle position. i

8. In a typewriting machine, in combination, a case-shift-frame, spring means for yieldably holding said case-shift-frame in lts normal position, case-shift-frame actuating means including an actuating arm connected ,with said frame, a key-lever, an intermediate lever pivoted thereon, an abut` ment to engage said intermediate lever to turn the same relatively to the key-lever when the latter is depressed, the intermediate lever engaging the actuating arm to move the frame `from its normall position, a stop to limit the movement of said frame b said key-lever, a return-spring for said rame,

and a spring to resist the turning of said intermediate lever relatively to the key-lever and to return the intermediate lever and the key-lever to their normal positions when the key-lever is released.

9. In case-shifting mechanism, the combination of a shift-frame, a rock-shaft, a keyoperated arm on said rock-shaft to actuate said frame in two directions from a middle or normal position, spring mechanism to return the frame to its normal position, said spring mechanism including a spring having a loop to embrace the rock-shaft and two arms extending from said loop, said arms having contacting portions close to the loop and then spread apart to form parallel portions, a holding device to embrace the contacting portions of said arms and hold them close together, said holdln device being fastened to said key-operate arm to hold the spring relatively thereto, and a fixed abutment extending between the sprlng arms and normally embraced thereby.

10. In a typewriting machine, in combination, a case-shift-frame comprising two side members, means including a spring to maintain the. case-shit-frame in its mifldle or normal position, locking means for said case-shift-frame comprising two arms ivoted at their lower ends and provide -at their upper ends with tapered projections to enter openings in the front ends of the respective side members, a bar connecting the lower ends of said arms, an arm extending upwardly from Said bar at the rear thereof and curved to the rear at its upper end to. form a hook, an arm extending forwardly from said bar and then upwardly, a cam on the rear face of the upwardly-extending portion of the last-mentioned arm, shifting means for the case-shiftframe including two key-levers extending from the front ofthe machine toward the rear thereof, one pivoted intermediate of its ends and having provisions on its rear arm to engage said hook and thereby release said case-shift-frame, and the other key-lever pivoted at its rear end and provided with a follower to engage said cam and release said case-shift-frame, and means whereby depression of one of said key-levers, after effecting release of` the'case-shift-frame, will lcause the latter to be shifted in one direction, and depression of the other key-lever, af-

ter effecting release of the case-shift-frame, will cause a shifting of the case-shift-frame in the opposite direction.

11. In a typewriting machine, in combination, a platen, a platen carriage, a vertically-movable shift-frame on which said platen carriage is mounted to travel transversely of the machine and with which the platen carriage is removable from the machine, said shift-frame comprising side members each having a vertical open slot at its lower edge,'a transverse shaft, arms projecting substantially horizontally from said shaft adjacent said side members, studs projecting laterally from said arms in such positions that, when the shift-frame is inserted into the machine from above, the studs will be received in said slots, and latches to hold said studs in said slots.

12. Thel combination with a main frame, of case-shifting mechanism comprising `a rock-shaft and r'oller bearings for said rockshaft, each roller bearing comprising an arm, a stud on said arm, rollers to bear against said stud, reduced ends on said rollers, and flanges on said stud to engage the reduced ends to hold the rollers on the stud, each roller bearing being detachably mounted on the main frame.

13. The combination with a main frame, of case-shifting mechanism comprising a rock-shaft and roller bearings 'for said rockshaft, each roller bearing comprising an arm, a stud on said arm, rollers to bear against said stud, reduced ends-on said rol- 1ers, a flange having a groove therein on said stud, and a disk secured to said stud, said disk having a flange to form a groove with said stud, the -reduced ends of the rollers engaging in said grooves to hold the rollers on the stud.

14. In a typewriting machine, in combination, a platen, a platen carriage, a vertically-movable shift-frame on which said platen carriage is mounted to travel transversely of the machine and with which the platen carriage is removable from the machine, said shift-frame comprising side i members each having a vertical open slot at its lower edge and a flange at its lower edge, a transverse shaft, arms lprojecting substantially horizontally from-said shaft adjacent said side members, studs project- 'ing laterally from said arms in such posi- -studs in said. slots, and adjustable stops above and below each flange .to limit the upward and downward movement of the shiftframe.

15. In a typewriting machine, in combination, a case-shift-frame, means for shifting said frame comprisin a forwardly-extending actuating arm, a s ift-key-lever pivoted at the rear of the forward end of said arm, an intermediate lever pivoted on said shift-key-lever, the rear end of the rearwardly-extending arm of said intermediate lever overlying the frontend of said actuating arm, and the forward arm of said intermediate lever extending forwardly and downwardly, an abutment on which said forward arm rests, a springtohold the forward arm against said abutment and thereby hold the rear end of the intermediate lever and also the key-lever in raised position, al second shift-key-lever pivoted at the front of the forward end of said actuating arm and having the rear end of the rearwardly-extending arm underlying the front end of said actuating arm, sald second lever having a downwardly-extending linger mally holding ment.

said finger against said @but- .to engage said abutment, and a spring nor-

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