US3588344A - Encoding mechanism - Google Patents

Encoding mechanism Download PDF

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Publication number
US3588344A
US3588344A US716150A US3588344DA US3588344A US 3588344 A US3588344 A US 3588344A US 716150 A US716150 A US 716150A US 3588344D A US3588344D A US 3588344DA US 3588344 A US3588344 A US 3588344A
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United States
Prior art keywords
shutter
actuator
spring
keylever
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US716150A
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English (en)
Inventor
Francis P Kahanic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Teletype Corp
Original Assignee
Teletype Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teletype Corp filed Critical Teletype Corp
Application granted granted Critical
Publication of US3588344A publication Critical patent/US3588344A/en
Assigned to AT&T TELETYPE CORPORATION A CORP OF DE reassignment AT&T TELETYPE CORPORATION A CORP OF DE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE AUG., 17, 1984 Assignors: TELETYPE CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs

Definitions

  • Miller ABSTRACT An encoding mechanism comprising an actuator mounted for rotation through four equally spaced positions, a spring for retaining the actuator in each of the four positions and for driving the actuator to the next position upon a predetermined amount of rotation of the actuator, a keylever for rotating the actuator the predetermined amount, a rotatably mounted shutter and a plurality of fingers extending from the actuator and positioned to engage the shutter, to rotate the shutter through a predetermined arc and to release the shutter as the actuator moves to the next position under the action of the spring.
  • an encoding mechanism useful in the keyboard encoding mechanism disclosed in the above-identified Gianni et al. patent is comprised of an actuator movable from a first position through a second position to a third position, a keylever for moving the actuator from the first position to the second position, means responsive to movement of the actuator to the second position for moving the actuator to the third position independently of the keylever, and encoding member and means on the actuator for operating the encoding member as the actuator moves from the second position to the third position.
  • FIG. 1 is a right side view of an encoding mechanism employing the present invention
  • FIG. 2 is a view similar to FIG. 1 showing the component parts of the mechanism in the position they occupy at a different stage in the operation of the device, and
  • FIG. 3 is a view similar to FIG. 2 showing the parts at the position they occupy at a still different stage in the operation of the device.
  • the encoding mechanism shown in FIG. 1 employs many parts that are similar to parts employed in the encoding mechanism disclosed in said patent.
  • the encoding mechanism 31 shown in FIG. 1 employs a keylever 55 having a keytop 56 that is mounted on a frame 50 for reciprocatery movement with respect thereto initially against and with the action of a spring 81 that is attached to the frame 80 by a fastener 82 and subsequently against and with the action of both the spring 81 and a keylever return mechanism 61.
  • the keylever 55 is guided in its reciprocatory movement by a pair of pins 83 and 84 that extend through a pair of slots 85 and 86 in the frame 80 respectively.
  • FIG. 1 also employs rotary shutter 106 that is pivotally supported on a shaft 107 for rotary movement with respect to a fixed stop 117.
  • the shutter 106 is positioned in a cutaway portion 105 of the frame 80 and has a plurality of tabs 110 extending radially from it.
  • the tabs 110 are positioned to cover individual ones ofa plurality of light conducting holes 112 extend through the frame 80 and are adapted to be selectively broken away so that their respective light conducting holes 112 are not covered upon rotary movement of the shutter 106.
  • the device shown in FIG. 1 employs a pair of square rods 71 and 74 which extend through square keyways 70 and 72 respectively in the frame 80 to position the encoding mechanism 31 with respect to similar devices.
  • a spring 116 is connected between the shutter 106 and the frame to rotate the shutter 106 counterclockwise with respect to the frame 50 into engagement with the pin 117. Because of this a universal hole blocking tab 113 of the shutter 106 is oriented to normally position a pin 111 at the bottom of a slot 115 extending through the frame 80 and a universal hole 111 is positioned just above, rather than just below, the tab 113.
  • the left-hand or front'leg of the keylever 55 is positioned in a shallow cutaway area 1511 of the frame 80 on the same side of the frame 80 as the shutter 106 rather than on the opposite side of the frame.
  • a tab and a hole 121 are positioned on the upper side of the frame 50 rather than on the lower side.
  • the major difference between the device shown in the drawing and the mechanism disclosed in the above-identified Gianni et al. patent is that the shutter 106 is operated by a shutter actuator 151 positioned within a deep cutaway area 152 of the frame 80 rather than by the shutter actuating mechanism disclosed in the Gianni et al. patent.
  • the shutter actuator 151 is pivotally supported with respect to the frame 80 on a post 153 by a bearing 154i and is comprised of a shutter engaging portion 155, a spring engaging portion 156 and a keylever engaging portion 157.
  • the shutter actuator 151 may be formed from a unitary body of material or the component parts thereof may be individually formed and then rigidly joined one to the other.
  • a square notch 162 is formed in the right-hand edge of the left-hand or front leg of the keylever 55 and is defined by an upper surface 163, a side surface 164 and a bottom surface 165.
  • the keylever engaging portion 157 of the shutter actuator 151 is provided with four equally spaced fingers 166 each of which extends radially from the keylever engaging portion 157 for enough to be engageable by the upper surface 163 and the bottom surface 165 of the notch 162 of the keylever 55.
  • the spring engaging portion 156 is provided with four flat side surfaces 167 that are arranged in a square about the post 153.
  • the shutter engaging portion is provided with four equally spaced shutter engaging fingers 168 that extend radially far enough from the shutter engaging portion 155 to engage the post 111 of the shutter 106 during rotation of the shutter actuator 151.
  • Rotation of the shutter actuator 151 with respect to the post 153 is controlled by the surfaces 163 and of key lever 55 and by a spring 169 that extends from a hole 170 around a post 171 and then substantially parallel to the left-hand or front leg of the keylever 55.
  • the spring 169 is positioned in a medium cutaway portion 172 of the frame 80 in engagement with one of the sides 167 of the spring engaging portion 156 of the shutter actuator 151 and serves to retain the actuator 151 in each of four rotative positions each characterized by one of the sides 167 extending parallel to the spring 169.
  • any further rotation of the shutter actuator 151 from the equilibrium point causes the spring 169 to impose a force component on the shutter 151 that tends to drive the shutter.
  • actuator 151 into its next rotative position, that is, into the position whereat the side 167 of the spring engaging portion 156 positioned adjacent the side 167 of the portion 156 that was last in engagement with the spring spring 169 is in engagement with the spring 169.
  • This action occurs regardless of whether the keylever 55 is further depressed, is released or is held stationary, that is, the shutter actuator 151 immediately snaps to its next rotative position independently of the keylever 55.
  • the shutter engaging fingers 168 of the shutter engaging portion 156 of the shutter actuator 151 are positioned on the shutter actuator 151 so that they are out of engagement with any portion of the shutter 106 at all times when the rotation of the shutter actuator 151 is under control of the keylever 55.
  • the spring 169 that is, when the shutter actuator 151 is rotated just past the equilibrium position shown in FIG. 2, one of the fingers 168 engages the post 114 of the shutter 106.
  • the sole function of the keylever 55 of the encoding mechanism 31 is to rotate the shutter actuator 151 past its equilibrium point thereby placing its continued rotation solely under control ofthe spring 169 and rendering it completely independent of the'keylever 55.
  • This feature of the mechanism in combination with the positioning of the shutter engaging fingers 168 for engagement with the shutter 106 only during the portion of the rotation of the shutter 106 actuator 151 controlled by the spring 169 prevents any rotation of the shutter 106 until a complete function, including the rotation of the shutter 106 to a blocking position and the return of the shutter 106 to the position shown in FIG. 1, is assured.
  • any keylever or combination of keylevers of the keyboard encoding device can be held partially depressed while any other keylever is actuated without causing the generation of an erroneous character.
  • an encoder is arranged for cycling in a first path between a passive and an active condition in response to manual depression of key means mounted in a keyboard for reciprocation in a linear path between a start stroke position past a medial position to an end stroke position, and having means for restoring the key means to its start stroke position, and means for restoring the encoder to a passive position
  • the subcombination of means for releasably coupling said key to said encoder comprising:
  • first extension means arranged for movement into and out of said linear path as said key means moves from its start stroke through its medial position for angularly moving said interposer; second extension means connected from said interposer and proportioned to project into said first path as said key means is depressed beyond its medial position for moving said encoder from its passive to its active position; and
  • biasing means associated with interposer for urging said key means to its start stroke position through said first extension means upon release of said key means when depressed while said first extension is disposed in said linear path, and for urging said encoding means towards its active position upon release of the said key means when depressed while said first extension means is disposed out of said linear path.
  • biasing means is a spring having an overcenter condition for rotating said interposer in opposite angular directions.
  • interposer has a plurality of symmetrically arranged corners proportioned for rotation into and out of engagement with said spring as said interposer is rotated to tension and relax said spring.
  • the key means comprises a key and an associated arm arranged for linear reciprocation in said linear path, said arm having a flat surface proportioned (1) for engaging said first extension means as said key means moves from its start stroke position toward its medial position for rotating said interposer and (2) for disengagement from said first extension means as said interposer moves beyond its medial position toward its end stroke position.
  • said first extension means comprises a plurality of first extensions projecting outwardly from said interposer in symmetrically spaced associated.
  • said second extension means comprises a plurality of second extensions corresponding with the first extensionsand projecting outwardly from said interposer in symmetrically spaced association whereby said encoder is cyclable repeatedly during each interposer cycle.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
US716150A 1968-03-26 1968-03-26 Encoding mechanism Expired - Lifetime US3588344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71615068A 1968-03-26 1968-03-26

Publications (1)

Publication Number Publication Date
US3588344A true US3588344A (en) 1971-06-28

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US716150A Expired - Lifetime US3588344A (en) 1968-03-26 1968-03-26 Encoding mechanism

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US (1) US3588344A (en))
BE (1) BE730400A (en))
FR (1) FR2004784A6 (en))
GB (1) GB1269411A (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247211A (en) * 1978-03-04 1981-01-27 Olympia Werke Ag Optically coded keyboard arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247211A (en) * 1978-03-04 1981-01-27 Olympia Werke Ag Optically coded keyboard arrangement

Also Published As

Publication number Publication date
BE730400A (en)) 1969-09-01
GB1269411A (en) 1972-04-06
FR2004784A6 (en)) 1969-11-28

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AS Assignment

Owner name: AT&T TELETYPE CORPORATION A CORP OF DE

Free format text: CHANGE OF NAME;ASSIGNOR:TELETYPE CORPORATION;REEL/FRAME:004372/0404

Effective date: 19840817