US1427398A - Typewriting machine - Google Patents

Description

K. A. LEHMANN.

TYPEWRITING MACHINE. APPLICATION FILED ocT. I4, 192|.

1,427, 39 8 A Patented Aug. 29, 1922.

2 SHEETS-SHEET I.

K., A. LEHMANN.

TYPEWRITING MACHINE.

APPLICATION FILED ocT. I4, 1921.

Patented Aug. 29, 1922.4

2 SHEETS-SHEET 2.

STATES APATENT oFFlcE.

KARL AUGUST LEHMANN, 0F ESSEN, GERMANY, ASSIGNOR T0 FRIED. KRUPP vAKTIEN GESELLSCHAFT, 0F ESSENON-THERUHR, GERMANY.

TYPEWRITING MACHINE specification of Lettersratent. 'Patented Aug, 29, 1922 Application filed October 14, 1921. Serial No. 507,754.

T 0 all whom t may] convent.'

'Be it known that I, KARL AUGUs'r @EH- machines, a special latch rail is required to lock the type keys and the type levers. The object of' the present invention is to provide a machine of the kind mentioned which will not require a special latch rail and which by this reason is simpler in construction than existing machines. rl`his object is attained by causing the locking of the keys and levers both by the margin adjuster and by the said special element to result from locking the universal bar.

The invention is illustrated in the drawing, in which,

Fig. 1 is a cross section through the machine, with the parts omitted which are not pertinent to the invention.

Fig. 2 is a section on line 2-2 of Fig. 1, looking from the right.

Fig. 3 is the same cross section as Fig. 1, with the parts in dilierent positions.

Fig. 4 is a section on line 1 -t of Fig. 1, looking from above and on `a larger scale.

Fig. 5 is a detail section ot' Figs. 1 and 3, with a part in another position.

The type levers B, connected as usual with the type lkeys C. are pivotally mounted on a partition wall A1, connecting the side walls A of the machine frame. In the rear face of said wall A1 is formed an arc-shaped groove a2 of rectangular cross section in which engages the universal bar D formed of a correspondinglyv curved sheet metal strip. Each type lever B is provided with a nose b1, with which said lever engages against the universal bar D, in moving `from its position of rest to its writing position, thus moving said bar parallel to itself. To the bar D is riveted, as appears in the drawing, a guide pin d1', which is guided in a hole a3 passing through the partltlon wall A1. Also, two levers d2 aremounted on the bar D, symmetrically with respect to the 'end of a bent lever G, ivoted on a bolt secured in the side wall in the axial line of the shaft E. The lever G is acted upon by a tension spring g1, which tends to hold said lever vin the position shown in the drawing, in which position its Jfr ee end stands at a certain distance from the end of the lever e2. To the lever G is connected a pull-rod g2 the other end of which is connected to one arm of a two-armed lever H H1 pivoted on theadjacent side wall. Against one arm of this two-armed lever bears the springpressed bolt J of an automatic margin adjuster, while the other arm H1 stands a short distance away from the end of a lever N. The automatic margin adjuster has a nose /tl adjustably secured to the carriage frame K, which nose, when engaged by a swinging abutment M, presses the bolt J downwardly. The lever N is fast on a pin nl, rotatable and longitudinally movable against the action of a spring n3 in the adjacent side wall A (Fig. 4;). The pin n is provided with a knurled head n2 for turning it. The head n2 carries a stop finger '114, by which said head can engage in a vertical or in an inclined groove a5.

In writing, the parts take the position of Fig. 1, in which, in particular, the springpressed bolt J takes its upper position and in which, further, the head 01.2 engages by its stop finger n4 in the vertical latch groove a5. When now a type key C is depressed, the tcorresponding type lever B is moved into the writing position, as usual. In its movement from its position of rest to its writing position, the type lever B engages, when it comes into the intermediate position shown in dotted lines in Fig. 3, the universal bar D with its nose b1, and moves said bar, and with it the two levers d2, parallel to itself in the direction of the arrow (Fig. 1). This movement of the levers Z2 causes a swinging movement of the levers el, pivoted thereto, and of the shaft E and lever e2, in the direction of the arrow y (Fig. 1).

'lhe shaft ll is not hindered iu this moveiueut b v the lever (i, since the latter takes, in the position mentioned of the bolt J and ot' the head nl and under the iniiuence ot the spring (1' au angular position (see Fig. .1), in which its free end 1s at a'suiiicieutly great distance-away from the tree end of the lever ("1. The type lever B accordingly strikes on the paper roll and the universal bar I), moves in the direction of the arrow. 11.', causes the several elements o the machine to be moved as necessary Jor writing. After release of the depressed key C, all of the said parts return to their position of rest. I As soon as the bolt J is pressed downwardly, in the neighborhood of the line margin, by the engagement of the nose k1 with the abutment BT, the two-armed lever H H1 is turned into the angular position shown in Fig. 3, in the direction of the arrow z. This causes, through the rod g2, the lever G to be rocked in the opposite direction to the arrow y. Thereby the lever G is moved into the angular position shown in Fig. 3, in which its free end engages the free end of the lever e2 and thereby locks the shaft E in the angular position correspending to said lever position.l But by this locking of t-lie shaft E, the universal `bar D, which is connected to said shaft by the levers d2 and el, is locked in the position shown in Fig. 3 also. Now when a type key C is depressed and the corresponding type lever B is moved into the intermediate position shown in Fig. 3, in which its nose b1 strikes against the universal rail D, the latter, in consequence of the locking of t-lie shaft E, cannot move and the type lever B and the type key C are also locked. As soon as, by returning the paper carriage, the nose 7.11 of the margin adjuster has again moved away from the abutment M, the bolt J returns, under the iniiiience of its spring, into its upper position shown in Fig. 1, and the double lever H H1, together with the rod g2 and the lever G, returns, under the influence of the spring g1, also into its original position shown in Fig. l, in which the lever G no longer prevents rotation of the shaft E' and lever e2.

When, in any position of the paper carriage, the type keys C and type levers B are to be locked, the pin nl is `pulled out, by

the head n2, against the action of the spring n3, so that the stop finger n4 is disengaged from the vertical groove a5, and then turned until said inger stands opposite the inclined groove a5. Then said head is released and the bolt n1 engages by the finger n,

under the influence ot' the spring n3, in said inclined latch grooye. The bolt nl is now secured in the angular position shown in Fig. 5, in which its lever N has turned the double lever H H1, with the rod g2 and lever G, into the locking position. The depression of any vtype key C, to cause the corresponding type lever B to strike t-lie paper roll, isnow impossible. When this locking of the type keys and levers issto be released, the bolt nl is turned back into the position shown in Figs. .1, 3 and 4, whereupon the double lever H H1, together with-the rod g2 and lever G, return into their unlocking posit-ion shown in Fig. 1.

Claims:

l. In combination with the type lever actuating devices of a typewriting machine, type levers actuated b said devices, a universal bar normally displaced by said type levers on actuation of the latter by said devices, and an independent dual control means for locking said bar and type levers,

one of said control means being an automatic margin adjuster and the second of said control means being a manually controlled device for locking at will said bar and type levers whether said irst control is actuated or not.

2. In combination with the type lever actuating devices of a typewriting machine, type levers actuated by saiddevices, a common bar normally displaced by said type levers, a common bar locking means, a bell crank lever actuating said bar locking means and a plurality of means for independently operating the crank members of the bellcrank lever, said plurality of means comprising a margin adjuster means and a inaniial control means for actuatinor said bar e locking means at will whether said adjuster means is operated or not.

8. In combination with the type lever actuating devices of a typewriting machine, type levers actuated by said devices, a. comnion bar displaced by said type levers when in normal operation, a common bar lockingr means, a bell-crank lever actuating said bar locking means when actuated one way, and

, a plurality of means for independently conber, i921.

KARL AUGUST LEHMANN,

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