US947688A - Pneumatically-operated type-writing machine. - Google Patents

Description

M. SOBLIK. PNEUMATIGALLY OPERATED TYPE WRITING MACHINE.

APPLICATION FILED flEPT. 22, 1909.

Patented Jan 25, 1910.

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MAX SOBLIK, F DUSSELDORF, GERMANY.

v PNEUMATIcALLY oPERATED TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Jan. 25, 1910 Application filed September 22, 1909. Serial No. 518,979;

I To all whom it may concern:

Be it known that I, MAX SOBLIK, a subof the German Emperor, and residing at Dusseldorf, Germany, have invented certain new and useful Im rovements in Pneumatically Operated ype Writing Machines, of which the following is a specifi cation.

' ing machines of the kind described in the; .Letters Patent Nos. 659,703, 676,59 0-and 1 5 757,066 the types are struck owing to a compressed air duct rotating with the typewhee'l feeding uninterruptedly with-com- V pressed air an open system of piping which opens into the keys; when said duct passes a normally closed end of a pipe the pressure of air produced operates mechanism which checks the rotation of the typewheel, causes the type to strike and the typewheel to retatelagain afterthe ty e has struck.

1 'stantly rotating typewheels it is necessary a that the operator pay particular attention to the duration of pressure on the keys and at once retract his finger, since otherwise the same type can be unintentionally struck a ain. I

?A primary object of my invent-ion is to obviate such danger and -to make the machine suitable for use'by less practiced operators. To this end I provide a new keyboard having an lmprovcd arrangement of valves such that when a, valve tor admitting compressed air is opened by a key be;

ing depressed it remains'openonly for an instant and automatically closes again at once.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawing wherein:

Figure 1 is a vertical transverse section through my new keyboard; Fig. 2 is a like view through one key and its appertaining valve in the normal position, and Fig. 3

shows the same when the valve has closed automatically after be ng opened by depressing the appertaining key.

In the machines re erred to having co n.

Referring to the drawing, my new keyboard cornprises the air-tight box 6 which can be connected detachably in Well-known manner withdthe compressed air conduit 01": the machine. Air is supplied uninterrn tedly intothe box through its inlet 0. Be ow each key Z) is arranged a valve box a. 'lhe-spring-pressed valve rod f in the latter carries the valve 9 which, with the intcrmediary of an elastic disk 7), closes the compressed air pipe [L which is in open relation with the ty ewriting machine,

z' is a ro or stem attached at its upper end to a key (Z and carrying revolubly at its bottom end an angle lever or pawl j.

Now. when the s ring-pressed key is depressed the arm Z 0 the lever will first abut against the head 0 of the valve rod f and open the spring-pressed valve 9, 7), as indicated in dotted lines in Fig. 2, when compressed air will flow from box I) through uct q into pipe 72 and on tothe members in question in the typewriting machine.

Simultaneously the other arm of the lever will strike the abutment 70 on the valvelbox and impart to the lever a rotary motion which will liberate the arm Z from the head of the valve rod, so that the head 0 of the latter can slide backalong the face m of the lever into its closed position, independently as to whether the finger has released the key or not. Obviously, in any event when the key is depressed once the type can only be struck once, sincethe quantity of air sent into the pipe it only suiiiccs for checking the motion of the typewheel once.

I claim 1 '1. In a keyboard for, a pneumatically operated typewriting machine, the combinapivoted in the valve box at the end of said I In testimony whereof, I aflix my signature item above saidd valve red, one arm of saig in the presence of two Witnesses.

ever bein a a ted to abut a ainst sai 7' valve rod 5nd o i en the valve w en the key SOBLIK is depressed, whereupon the other arm of Witnesses:

said lever coacting' with said abutment re- OTTO KGNIG,

lenm the former arm from the valve red. CHAS. J. WRIGHT.

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