Browse Prior Art Database

Typewriter with Reversible Writing Line

IP.com Disclosure Number: IPCOM000075406D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 6 page(s) / 150K

Publishing Venue

IBM

Related People

Palmer, LE: AUTHOR

Abstract

A typewriter like that described in IBM Office Products Division Customer Engineering Service Manual, Form #241-5615-0, published November, 1970, by International Business Machines Corporation, Armonk, New York, is made to type and perform functions such as interword space, backspace, carrier return, and tabulation both for languages reading from left to right and, upon operator selection, for languages that read from right to left.

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Typewriter with Reversible Writing Line

A typewriter like that described in IBM Office Products Division Customer Engineering Service Manual, Form #241-5615-0, published November, 1970, by International Business Machines Corporation, Armonk, New York, is made to type and perform functions such as interword space, backspace, carrier return, and tabulation both for languages reading from left to right and, upon operator selection, for languages that read from right to left.

Incremental left-to-right spacing of the printing point is performed by a cam driven mechanism like that described beginning at page 45 of the service manual and is selected by depression of a trigger member 110 (see Fig. 1). Incremental right-to-left motion of the printing point is generated by mechanism as described beginning at page 52 of the manual, and its operation is initiated by depression of a trigger member 111 (see Fig. 1).

Rapid continuous left-to-right movement of the print point is produced by mechanism somewhat like that described at the beginning of page 55 of the manual but modified as shown in Fig. 2, to operate in response to depression of a trigger member 71, shown in Figs. 1 and 2. Rapid continuous right-to-left motion of the printing point is produced by mechanism like that described beginning at page 63 of the manual and its operation is initiated by depression of trigger member 13 shown in Figs. 1 and 2. Index or line feed movement of the print point is performed by mechanism like that described beginning at page 81 of the manual and partially shown in Fig. 2. The index function is initiated by depression of a trigger member 12 shown in both Figs. 1 and 2.

A type direction control key 112 acts through link 113, vertical crank arm 114, and horizontal crank arm 115 to position a laterally slideable or switch plate 59 to its left position as shown or rightwardly to an alternate position. Switch plate 59 defines a comb having slots 116 that individually position a group of dobbers 117, 118, 119, 120, and 121 in alignment with different ones of the triggers 111, 110, 13, 12, and through a crossover link 122, trigger 71. These dobbers move downwardly upon keyboard manipulation that selects a typing function such as letter space, interword space, backspace, carrier return, or tabulation. Whether the printing point moves to the right or left in order to accomplish the selected function, is controlled by which of the triggers is aligned with the depressed dobber. LETTERFEED.

With the direction control key 112 set in the position as shown in Fig. 1, printing of any letter will be accompanied by an incremental left-to-right step of the printing point. This step is accomplished in the same manner as described on page 39 of the service manual through keyboard filter shaft cam 123 (see Figs. 1 and 3), follower 136, link 141, bracket 133, trigger 98, and escapement torque bar 33. Dobber 117 (Fig. 1) is depressed by cam follower 138 in response to rotatio...