US2179021A - Typewriting machine - Google Patents

Description

D. Y. READ Zmventor lllIlIIlIlllIlll/llll.

TYPEWRITING MACHINE original Filled Nav. '7, 1952 Nov. 7, 1939 Patented Nov. 7, 1939 t UNITED STATES TYPEWRITING MACHINE David Y. Read, New York, N. Y., assignor of onefourth to Jessie P. Grandy, andjonei-fourth to Henry H. Snelling, both. of Washington, D. C.

Original application November .7. 1932, Serial No.

641,630. Divided and this applicationl May 17,

1937, serial No. 143,186

11 claims. (C1. 1er-6e) p y Fast to the top of the sleeve 38| is a head 386 This invention relates to typewriting and calculating machines and has for its object the im. provement of the carriage operating mechanism.

A particular object of the invention is the provision of a simple motor ldriven carriage retur for typewriters. j

This is a division of my application, vSerial No. 641,630 filed November 7, 1932, now Patent Number 2,114,270 dated April 12, 1938.

Figure 1 is a fragmentary vertical transverse section of a machine taken through the motor return shaft.

Figure 2 is a side elevation of the parts shown in Figure 1, this part being taken at 90 to Figure 1.

Figure 3 is a top plan view of the parts shown in Figures 1 and 2.

Figure 4 is a plan view in an inclined plane of the snap spring for holding the motor shaft sleeve in its elevated position.`

Figure 5 is a side elevation of the carriage rail partly broken away.

Motor carriage return- While naturally the typewriter carriage can be returned by hand it is convenient to provide means to save the operator this eXtra exertion. I therefore provide a carriage motor return key 366 mounted rather high above the level of the horizontal portion of its lever 36| so that the key itself may be in line with the letter keys and the lever may be below all of the letter key bars and also the space bar levers. The lever 36| is pivoted at 362 between a pair of depending ears 363 on the central bracket 364 of a casting 365 which supports most of the motor carriage return mechanism.

A downwardly projecting lug 361 is bored on opposite sides as at 368 to receive the ends 369 of a double convex spring 310 which actsv as a toggle to keep the rear end of the lever 36| either all the way up or all the way down. The center of this spring 310 is received in a kerf 31| in the lever 35| which passes outside or just to the right of the vertical motor shaft 311 having on its bottom a gear 318 receiving power from a motor shaft 319 thru a worm 380. A sleeve journalled in the central bracket 3641 and also in an upper bracket 383 of the casting 365 is splinedto the constantly revolving vertical shaft 311 by meansV of a rounded end screw 381i which ts loosely in a slot 335 in the shaft 311 so that while the sleeve 38| is forced to revolve with the shaft 311 it may move vertically with respect to it when the lever 36| is moved about its pivot 362 since this lever lies tight to the shaft 311 and engages the bottom of the sleeve as best seen in Figures 1 and 2.

having a cooperating member or collar 381, forming with it' a clutch. The head is fast to the sleeveand forms its support, this clutch element having a bearing on the top surface of the upper bracket 383 of the casting 365 which by the way is secured to the lower frame or bed of the machine so as to be readily detachable therefrom, preferably'from the outside as for example, by the f i screws 389. The collar 381 or upper portion of the clutch is guided and retained by the shaft 311 and is normally held in place by gravity only.

Thecarriage return drum 214 is journaled as at 390 'to the underneath side of the table 86 whichfis the top plate of the hood and this drum has teeth 39| engageable with similar cooperating teeth 393 on the collar 381. The drum 214 has fast toits peripheral groove a cord 213 which passes over a pulley 394 journaled to the rail l and has its free end attached to the blade 262 which is carried by the rail but has a slight movement with respect thereto for a purpose fully explainedv and claimed in'm-y Patent No. 1,888,144,'dated kNovember 15, 1932. The function of the'spiral spring 395 on the shaft 390 the cord 213 taut at all times and the spring is preferably a small hair spring offering no'appreciable obstruction tov the movement of the carriage.

The operation of the motor carriage return is asfollows: The key 360 is pressed down. The rear end ofthe motor carriage return key lever 36| compresses the spring 310 while raising the sleeve 33|. When the key 360 is pressed half or more of its travel the spring 31|] starts to ex- .and connected to the pulley 394 is merely to keep pand and forces the sleeve 38| to its upper limit i of travel, carrying the collar 381 into contact with the drum. The rotation of the shaft and sleeve is4 now transmitted to the drum which winds up the cord 213 until the carriage movement is stopped. The shaft 311 howeverl is constantly revolving and since the collar 381, which is not fast to the shaft 311 in any way, 'can no longer revolve with the shaft311 since the cord 213 is nowtaut, the steep angular faces between vthe head and collar cam down the sleeve which is held up only by the spring 310, and which is purposely relatively weak. This actionlowers the head` 336 and the height of the teeth in the clutch is sufcient to carry `the spring 310 past the so-called dead line position considering it as a toggle and the spring 310 therefore snaps the lever 36| back to normal position.v The collar 381 which now has nothing to keep it aloft falls by gravity with the sleeve 38| into the position shown in Figures 1 and 2.

The drawing up or winding of the cord 213 on the drum 214 accomplishes two substantially simultaneous motions as in an ordinary typewriter, one the return of the carriage and the other the line spacing operation. In an ordinary typewriter however these two operations, while substantially simultaneous, may take place one before the other and in any event the line spacing is positively moved, whereas in the present machine the line space is merely set and a spring shown in my Patent No. 1,888,144 dated November 15, 1932 performs the actual line spacing of the paper holder only after the cord 213 is released. The return of the carriage is had since the pulley 394 is fast to the carriage rail III and the line spacing setting is had since the blade 262 is pulled to the left with respect to the rail as viewed by the operator. p

Considering now Figure 5, the winding of the drum 214 moves the rail iii to the right as viewed from the operator. The blade 2612 is moved generally in the same direction since it is secured to the carriage rail frame by the bracket pins 21| but in view of the connections, as best seen in Figure 3 the blade is given a reverse movement with respect to the rail during the motor carriage return operation. This causes the blade rack teeth 288 to turn the gear |21 and consequently the rod H8 in a clockwise direction as seen in Figure 5i which may operate linkage for any desired purpose, for vexample to set the line spacing mechanism as fullydescribed in my Patent No. 1,888,144 dated November 15, 1982; this linkage is not shown herein because it is only incidental to the present invention. In other words as far as the carriage return is involved the free end of the cord 213 might be connected directly to the rail.

What I claim is:

v1. In a motor driven carriage return mechanism, a constantly driven shaft, a sleeve slidably splined thereto, a carriage return drum adjacent the sleeve, a clutch actuated by shifting of the sleeve for operatively connecting the drum and sleeve, means controlled by the operator for shifting the sleeve to clutching position, and additional means, cooperating with the last mentioned means and operative in response to a predetermined load on the clutch, for automatically disconnecting the clutch and drum when said drum is checked, y

2. In a carriage motor return, in combination, a rotatable member connected to a carriage to move the same, a drive shaft, a clutch element carried by said rotatable member, connecting means slidably spined to said shaft, a second clutch element carried by said connecting means, means for shifting said connecting means and thereby moving said elements into clutching position to connect said shaft and rotatable member, and means for automatically separating said clutch elements in response to increase in load produced when the rotatable member is checked, said connecting means including load responsive means for initiating ,the separating movement of said clutch elements.

3. rIhe device of claim 1 in which said additional means includes a snap over toggle spring for yieldingly holding the sleeve in clutchingor disconnecting position.

4. The device of claim 1 in which the clutch is in three parts, one secured to the drum, a

second part secured to the sleeve and the third part is between the two clutch parts just mentioned, said third part engageable with the first part to drive the same and having an inclined plane driving connection with the second part and designed to force the sleeve toward disconnecting position in response to a stopping of the drum.

5. In a typewriting machine motor driven carriage return mechanism, a carriage, a drum operatively connected to the carriage, a motor driven shaft, means including a clutch for connecting said drum and shaft to return the carriage, a key depressible for moving the clutch to operative position, yielding snap over toggle means for retaining the key in depressed position and the clutch in clutched position during movement of said drum, and means in the clutch and cooperating with said yielding means for automatically restoring the clutch and key to normal position upon checking of the carriage return movement.

6. In a typewriter, a carriage, a drum, a band v connecting said drum and carriage to return the carriage, a constantly revolving shaft, a clutch element slidably supported on said shaft but constrained to revolve with it, a loose collar having clutch engagement with the drum and with the clutch element separately and with both togather, means for shiftingthe clutch element and thereby moving the collar into engagement with the drum to cause the drum to be driven by said shaft, said means including mechanism for yieldingly holding said elements in such position, the engagement between the clutch element on the shaft and the collar including steeply sloping teeth so that the collar and clutch element are disconnected upon the stopping of the drum due to an 'obstruction to the carriage.

'7. The device of claim 6 in which the clutch element is fast to a sleeve which surrounds the shaft, and the collar is supported by the clutch element and guided by the shaft.

y, 8. The device of claim 6 in which said shifting means includes a motor carriage return control lever for raising the collar into engagement with the drum, snap over toggle means for holding said lever in collar elevated position and for restoring said lever when the clutch elements are disconnected.

9. In combination, a three-piece clutch, an elongated flexible carriage return member secured to one of saidpieces, a motor, a carriage return key, mechanism movable by said key to connect the motor and member through said clutch to move the member in carriage return direction, two of the pieces of the clutch having cooperating steep angular faces whereby the clutch pieces are quicklyseparatedwhen the member is locked against rotation, a snap over toggle spring positioned to hold the key in clutching position or in normal position, said cooperating faces being dimensioned to move the key past mid position in separating said clutch pieces whereby the toggle then throws the key to normal position-thereby disconnecting the motor from the carriage return member, v

10. In a motor driven carriage return mechanism, a constantly driven shaft, a sleeve slidably splined thereto and having a normal position and a clutching position, a carriage return drum adjacent the sleeve, a clutch for operatively connecting the drum and sleeve, carriage return key means for shifting the sleeve to clutching position, and declutching means responsive to a prethe drum teeth, a head, cooperating steep angular teeth on said head and collar, a motor driven shaft coaxial With the drum, collar, and head, a splined connection between thev shaft and head for Winding the member on the drum when the head is moved toward the drum, a carriage return key for moving the head toward the drum, and means for returning the parts to initial position When the resistance to rotation of the drum causes the steep angular teeth' to 10 separate the head andcollar.

DAVID Y. READ.

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