US1027391A - Platen mechanism for type-writing machines. - Google Patents

Description

J; RABER.

PLATBN MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED FEBFIQ, 1909.

1,027,391, Patehted May 21, 1912.

UNITED STATES ragnntr orrion.

JOSEPH RABER, OF 'POPLAR "BLUFF, MISSOURI, ASSIGNOR TO ADDING TYPEWRITER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

I'LA'IEN MECHANISM FOR TYPE-WRITING- MACHINES.

Bluff, Missouri, have invented a new and useful Platen Mechanism for Type-\Vriting Machines, of which the following is a specification.

This invention relates toplaten mecha-.

nisms for typewrit-ing machines, and has for its object to provide devices arranged to cooperate with a rat'chetwheel on the platen shaft effectively to adjust the platen at'the exact position desired at which line space movement in combination. with friction devices arranged to cooperatewith the platenwhereby the platen will be held iii-any desired adjustment, and controlling means whereby any of saiddevices may be brought into operative position. j

In the drawings Figure 1 is a perspective view of the subject matter of the present in vention detached from the platen. -Fig.' '2 is a sectional view taken on the line 2-2 of Fig. 4. Fig. 3 is a sectional view taken on the line of Fig. 4: showing the friction devices in connection with a platen. Fig. is a front elevation of a portion of the platen having'my present invention arranged to cooperate therewith. Fig. 5 is a perspective view of the controlling or operating shaft whereby the line space controlling devices and the friction devices are operated.

The platen 1 is of the usual construction mounted on a shaft 2. whereby the platen may be rotated to move the paper longitudinally in its line spacing movements. A

feed ratchet wheel 3 is attached on the shaft for cooperation with any suitable line space mechanism the arrangement and construction of which are immaterial to thepresent inventionf A second ratchet wheel is interposed between the end of the platen and the wheel 3 being also in rigid connection with the platen shaft. A. shaft 5 is sup ported .parallel with the platen shaft 2 and carries a bracket 6 in which is journaled a shaft or spindle 7. Upon the shaft 5 two curved arms 8 are pivoted and carry rollers 9 on their free ends. 7 Asprmg 10 connects the arms 8 acting to hold the rollers 9 in engagementwith the teeth on the periphery of the wheel 4;, so that when the platen is oper-' ated to move the'paper in line spacing, the tension ofthe spring 10 will cause the rollers 9 to act upon the wheel 4 effectively to move and hold the platen'at the exact adjustment desired. The arms 8 have extensions beyond the shaft 5 which embrace the spindle 7.. The spindle 7 is formed with a narrow portion 7 formed by cutting away portions of the opposite sides thcreof,'said narrow portion being embraced by the extended portions of the arms 8- as shown in Fig. 2. lVhen the spindle 7 ,is-adjusted as' shown in Fig. 2. the rollers 9 are held in engagement with the ratchet wheel 4: by their spring 10, but rotation of'the spindle will operate the arms 8 effectively to raise the rollers 9 out of engagement with the wheel t into the position shown in Fig. 3, thereby permitting the platen to stop in any position.

12 indicates two curved arms pivoted upon the shaft 5 having their free ends extending between the end of the platen and the ratchet wheel 4.. and their opposite ends provided with extensionsv on opposite sides of the spindle'i. The arms 12 are connected by a spring 13 acting to draw the free ends of said armsint-o contact with a hub or collar 14 on the platen shaft between the end of the platen and the wheel 4. v

A narrow portion 7 is formed on the spindle 7 and is arranged to coi'iperat'e with the extensions of the arms 12 in such manner that said arms will be held' out-of engagement with 'thehub or collar ll when is attached to the spindle 7 constituting manually operable means for turning said Specification of Letters Patent. Patented Blay 21, 1912,

Application filed February 19, 1909. Serial No. 478,970.

spindle as required to operate the arms 8 Y or 12. thebracket (l and has one end arranged to cooperate with the fiat surfaces 7 on the head of the spindle 7 to hold said spindle and the arms 8 and 12in their different A spring plate 16 is attached tov placed, whether in complete'line' space position or in any fractional portion of the line space.

I am aware that there may be modifications and alterations in the construction and i arrangement of the parts embodying this invention without departure froxnthe spirit and scope of the invention, and I do not restrict myself to identical features of construction or arrangement, but

What I claim'and desire to securely Let-- ters Patent is--- I 1-. The combination with a platen, a wheel rigid therewith having teeth on its periph- 'ery, arms arranged to engage with said ratchet wheel, friction devices, and a lever operabletorelease said arms from engagement with said ratchet wheeland to cause i5,

said friction devices -to operate, substantially asspecified.

. 2i-The combination with a laten, a ratchet wheel rigid therewitlnand a'hub or collar rigid with said ratchet wheel and platen, of friction, devices operable-i0 engage with'said hub or collar, arms arranged to engage wi said ratchet wheel, and a 3. The combination with a platen, of a shaft or spindle devices for holding the platen inexact pcsition at each line space so ration, a spring for actuatin said de-' vices t'oQhold said platen, a friction device rate with the platen when devices are inoperative, a

arran ed to 006 said ISlV-Ilitlll spring for'actuating said, friction device to coiiperatewith the platen, an element for operating said shaft or spindle effectively to actuate said first-named devices or said friction devices to different adjustments, I

to engage with said wheel, a friction device pivoted on said shaft and arranged to cooperate with the .platen when said detent is ino erative, a lever operable to disengage said etent from said wheel and to cause said friction device to move to position efiective to restrain rotation of said platen, separate springs for actuating said detent and said friction device, and an element arranged to hold said friction devicein the position aforesaid, substantially as specified.

5. In a typewriting machine, a platen, a wheel rigid with said platen, a detent arranged to engage with said wheel, a spring actuating said detent, a friction device, a separate spring actuating said friction device, a lever controlling said detent and said friction device, to-move them inopposition to said s rings at dilferent times, and a latch hol in I said detent and said friction device-in di erent adjustment, substantially as specified.

In testimony whereof, I hereunto afiix my si ature to this specification this 28th day 0 January, 1909, in the presence of two witnesses. I

JOSEPH RABER. [1,. s.]

Witnesses: I

' CHARLES PIcKLEs,

JOHN E. Gnnvn,

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