US2843667A - Line feed suppression device - Google Patents

Line feed suppression device Download PDF

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US2843667A
US2843667A US491015A US49101555A US2843667A US 2843667 A US2843667 A US 2843667A US 491015 A US491015 A US 491015A US 49101555 A US49101555 A US 49101555A US 2843667 A US2843667 A US 2843667A
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function
bar
line feed
bars
carriage return
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US491015A
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Ransom D Slayton
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AT&T Teletype Corp
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AT&T Teletype Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/16Apparatus or circuits at the receiving end

Description

July 15, 1958 R. D. SLAYTON LINE FEED SUPPRESSION DEVICE Filed Feb. 28, 1955 ATTORNEY 2,843,667 Patented July 15, 1958 LINE FEED SUlPlPREiSliQN DEVTQE Ransom D. Slayton, Lombard, Iii, assignor to Teletype Corporation, Chicago, 1th., a corporation of Application February 23, 1955, Serial No. ifiiylilfi 5 tllaims. (Cl. 173-25) The present invention pertains to page printing telegraph apparatus and more particularly to improvements in function controlling mechanisms therefor.

The primary object of this invention is to provide a function suppression means automatically efiective after the first of a succession of related function responses.

This invention contemplates the effectuation of limited line feed functions pursuant to a condition which would otherwise result in a plurality of line feeds. This requirement is predicated 011 the inclusion of an automatic line feed on receipt of a single carriage return code signal combination, which is provided in the first instance in order to prevent printing over existing copy. This function is commonly called line feed on carriage return. When sequences of carriage return and line feed code signals are employed for control purposes other than those normally assigned to them, it is desirable to prevent these signals from mutilating or overlining the printed record or copy. Moreover, the arrangement according to the present invention protects the printed record against bursts of static encountered in radio circuits that would result in spurious carriage returns.

Another feature of the invention resides in the fact that on receipt of a carriage return line feed sequence (for example, (ZR-LP or CR--CR-LF) at the end of a line, the copy will be advanced only one line, rather than two or three lines, in order to minimize the waste of stationery.

Thus, in order to minimize garbled copy, and also to prevent paper waste the arrangement according to the present invention accomplishes (1) normal line feed operation on receipt of single or multiple line feed signals, (2) carriage return and line feed operations on the receipt of a single carriage return signal and (3) carriage return and single line feed operation on receipt of a CRLF or CR-CR-LF sequence.

The foregoing and other objects and features of the invention will be more apparent in the following detailed description of the invention when taken in conjunction with the accompanying drawings, wherein:

Fig. l is a transverse cross sectional view of the selective control unit taken substantially at the position of the line feed function lever;

Figs. 2 and 3 are fragmental top views of the arrangement shown in Fig. 1;

Fig. 4 is an elevational view of the line feed mechanism, and

Fig. 5 is a schematic elevational view of a page printer embodying the mechanism according to the present invention.

Having reference to Fig. 1, there is shown the basic function mechanism with which the line feed mechanism according to the present invention is associated. This basic function mechanism is located in the receiving page printers at all outlying stations. For a more thorough description of the printer with which the basic function mechanism shown in Fig. 1 is designated to be used, reference should be had to the United States Patent No.

Ad 2,505,729, the disclosure of which is incorporated herein by reference. Reference may also be had to United States Patent No. 2,666,095 covering the basic function mechanism.

A set of code bars, indicated generally by the numeral 20, is suitably mounted within the printer, which code bars are comparable to code bars 62 or 70 of said Patent No. 2,5ti5f/29. Moreover, code bars 20 are positioned permutably under the control of a signal responsive means, exemplified by selector magnet 10 (Fig. 3), comparable to magnet 13 of said Patent No. 2,505,729. Certain of said code bars 20 are movable longitudinally to one of two positions in accordance with the marking and spacing impulses of the Well known Baudot code. Other of said code bars 20 are shifted longitudinally under predetermined operating conditions as indicated in said Patent No. 2,505,729. A plurality of function bars 21 are suitably mounted in the apparatus with respect to the code bars 26, and are urged to the right (as viewed in Fig. 1) towards the code bars 26 by means of springs 22 indi vidual to each function bar. Each function bar 21 has a plurality of code projections 23 which cooperate with code notches 24 in each of the code bars 20, in well known manner.

A power shaft 31 carries thereon an eccentric cam 30 (Fig. l). A collar 32 is mounted rotatably on the eccentric 36 and has an arm 33 by which the cam 30 is attached pivotally to a lever 34 supported pivotally on a shaft 35. A bail 36 (Fig. 1) has a pair of arms 3'7 which are mounted pivotally on a stationary shaft 38. A pair of toggle links 39 are secured pivotally at ii to the arm 37, and are secured at the other ends thereof to pivots 42 to which the lever 34 is also secured. As the shaft 31 rotates, the lever 36 is oscillated about the shaft 35 to thereby, through the toggle links 39, oscillate the bail 36.

A function pawl or secondary member 436 has an elongated slot 67 by means of which said function pawl 46 is mounted for longitudinal movement on a shaft 48. A spring -59 continuously urges the function pawl 46 to the right (Pig. 1) and counterclockwise about the shaft 43. which cooperates with a shoulder 51 on the function bar 21. Normally the latch 56 rides on the top of the shoul der 51 (as illustrated in Pig. 1) thereby permitting the spring %9 to retain the function pawl 46 in its rightward position. A function operating lever or instrumentaiity 53 is mounted pivotaily on a shaft 54 and cooperates with a laterally directed portion 56 on the function pawl 46. The function operating lever 53 is biased in a clockwise direction by a spring 57. Associated with the lower end of the function operating lever 53 is an interponent member 59 the purpose of which will be described hereinafter. interponents 5% are slidably carried in a guide bracket 55.

Spring 57 is distended between lever 53 and a latch element 61 individually associated therewith. Element 61 is pivotally mounted on a rod 62 and is normally biased clockwise by spring 57 into cooperative relation with lever 53. Element 61 is provided with a shouldered portion 63 adapted to coact in latching relation with a projection 64 on lever 53. Element 61 is also provided with a projection 65 adapted to cooperate with a stripper bail 66.

Assuming that a permutation of positions of the code bars 20 has been set up which correpsonds to the function bar 21, the bail 36 moves to the right and all of the projections 23 are opposite notches 24. The spring 22 is thereby permitted to move the function bar 21 to the right, the projections 23 entering the notches 24, and the shoulder 51 underriding the latching shoulder 50 to thereby engage said latching shoulder 50 due to the action of spring 49 upon function pawl 46. There- The function pawl 46 has a latching shoulder 50 after as the bail 36 moves back to the left during its return stroke it moves the function bar 21 also, the function bar 21 in turn moving the function pawl 4-6 to the left. As the function pawl 46 moves to the left in this manner, the lateral projection 56 thereon engages and pivots the function operating lever 53 counterclockwise against the action of spring 57 to cause the interponent 59 to be thrust rightwardly (as viewed in Fig. 1). At the same time, the lever 53 becomes latched in its counterclockwise position, through the interaction of its projection 64 and the shoulder 63 of the latch element 61.

During the above-mentioned selective operation of function bar 21, the function pawl 46 was shifted from its solid line position to the dotted line position 67 over a vertically reciprocating stripper bail member 66. Thereafter, as a new selection is being made in the code bars 20, the stripper bail 66 in its upward and downward movement acts in proper timed relation to strip or disengage the function pawl 46 from latching engagement with its corresponding function bar 21, and also the latch element 61 from its associated lever 53. Stripper bail 66 is reciprocated vertically by suitable camming instrumentalities associated with the shaft 31.

Having reference to Fig. 4, the line feed mechanism contemplated herein is of the type disclosed in United States Patent No. 2,667,256, issued January 26, 1954, to B. F. Madsen, and comprises a gear 71 fixedly related to the platen 72 of the printer, and a pair of drive or rack members 72 and 7d. The gear 71 rotates with the platen 72 and the rack members 73 and 74 are adapted to be alternately engageable with the teeth on the gear 71 with a slight overlap of engageability being provided, so as to impart rotative motion to the gear 71 and platen 72. The rack members '73 and 74- are connected to eccentrics 75 and 76, respectively, which are operatively.

related to the line feed clutch 77 (Fig. l) hereinafter described. Power for operating said racks 73 and 74 is derived from the main shaft 31 through said clutch 77. The eccentrics thus control the reciprocatory motion of the rack members 73 and 74. As shown in Fig. 4, the rack members 73 and 74 are adapted to be rotated on a movable pivot 78 comprising a roller 79 cooperable with slots 81 and 82 in said rack members 73 and 74. The pivot roller 79 is carried on the vertical arm of a bell crank 83 pivotally mounted on a pivot stud 84 fixed to the side frame of the apparatus. The bell crank 83 is normally biased clockwise about pivot 84 by a spring 85 against an adjustable stop 86.

Upon rotation of the eccentrics 75 and 76, a combination of rocking motion about pivot 78 and vertically reciprocating motion is imparted to the rack members 73 and 74. When the rack members 73 and 74 are rotated clockwise alternately about the pivot roller 79 by their respective eccentrics 75 and 76, the teeth on the rack members 73 and 74 will engage the teeth of gear 71. To permit the rack teeth to mesh with the gear teeth under pressure during a line feed cycle, the fulcrum or pivot roller 79 is made movable so that slight counterclockwise movement is imparted to bell crank 83, thus increasing the tension of spring 85.

As viewed in Fig. 4, the eccentrics 75 and 76 are rotated in a counterclockwise direction. When the long radius of eccentric 76 is operative to the left of the vertical center line of the shaft 87, the rack member 73 is actuated clockwise about pivot 78 to bring the rack teeth into engagement with the gear 7 ll. The rack member 73 is also actuated downwardly to impart counterclockwise rotation of the gear 71, and hence to platen 72. Then, when the long radius of eccentric 76 is operative to the right of said vertical center line, the rack member 73 is actuated counterclockwise about pivot 78 to disengage the rack teeth from the gear 71. The rack member 73 is further actuated upwardly with the teeth thereon free of the gear 71. The same actions are imparted to the rack member 74 by the eccentric 75 except that they occur alternatively, thereby imparting smoothly accelerated and decelerated movement to the gear 71.

In the performance of the line feed operation, the line feed code signal is received by the selector mechanism, such as described in said Patent No. 2,505,729, to effect a setting of the code bars 20 to select the line feed function bar 121, Figs. 2 and 3 (similar to bar 39 shown in 29 of said patent). Pursuant to the receipt of the line feed code signal, the bail 36 will be oscillated, whereupon the function bar 121 will be reciprocated to permit shoulder 51 to engage the step 50 of the pawl 46. Then, upon leftward movement of the function bar 21, the lever 53 will be rotated counterclockwise to force the interponent 59 rightwardly.

Cooperating with the interponent 59 is an arm 91 of a clutch trip lever 92, the other arm of which is provided with a stop portion 93 adapted to coact with a laterally directed stop projection 94 on the stop disc 95 of the three-stop line feed clutch 77, which is operatively related (frictionally or otherwise) in well known manner to the power shaft 31. The clutch trip lever 92 is normally biased counterclockwise by a spring 96 and is held against a stop 97. The line feed gearing is such that each one-third revolution of the clutch will advance the platen by one line. That is, each one-third revolution of the line feed clutch 77 causes its attached spur gear 90 (Fig. 4) to rotate the line feed eccentric spur gear 99 and its attached eccentrics 75 and 76 one-half revolution.

The carriage return mechanism is exemplified in Fig. 3 by the carriage return function bar 100 which is coded to respond to the carriage return signal. In Fig. 5, the carriage return mechanism is illustrated schematically as embodied in a printer of the type disclosed in said Patent No. 2,505,729. The strap is adapted to be wound around a carriage return drum 116, and extends around the idler pulleys 117 and 118 to the spacing drum 113. The character spacing means is herein exemplified by spacing pawl 11 and spacing ratchet 12 (Fig. 5), Which are comparable to spacing pawl 517 and spacing ratchet 519, shown in Fig. 25 of Patent No. 2,505,729. Fixed to the strap 115 is the movable type carriage 114 adapted to cooperate with the fixed platen 72. With the arrangement according to the invention, forward spacing is accomplished in a step-by-step manner, and normal carriage return is, also accomplished as disclosed in said Patent No. 2,505,729 or as described in copending application Serial No. 260,151, filed December 6, 1951, by B. F. Madsen. The carriage re turn function bar 100 (Fig. 3) is selectively operated in the manner herein described to actuate an operating lever similar to lever 53 to, in turn, actuate an interponent similar to interponent 59 to effect the carriage return operation as set forth in said copending application. In Fig. 1, a carriage return auxiliary bar 101 is shown, which is coded in the same manner as said carriage return function bar 100 located on the opposite side of I, the apparatus. It has been shown how a line feed operation is performed in response to a line feed signal. As previously mentioned, a line feed operation may also be performed simultaneously with a carriage return operation in response to a carriage return signal. T o achieve this result, a second function bar, identified as the line feed on carriage return" function bar 102 is provided adjacent to the line feed function bar 121. Function bar 102 is coded on its forward or leading edge in the same manner as the carriage return function bar 100 and also the carriage return auxiliary bar 101, so that upon the setting of the code bars 20 in response to the carriage return code signal both of the bars 101 and 102 will be selectively operated; the bar 101 acting in the manner to be described, and the bar 102 acting simultaneously therewith to control the line feed clutch 77 to effect a line feed operation.

The operating lever (similar to lever 53) individual to the carriage return auxiliary bar 101 is articulated pivotally to a slidable bar 183 operable in a guide 104. Bar 103 is provided at its forward end (right end, as viewed in Fig. 1) with a depending portion 105 which is adapted at its lower end to cooperate with shoulders 106 and 107 of function bars 121 and 102, respectively.

Thus, when the carriage return auxiliary bar 101 is operated rightwardly in response to the carriage return signal, it will engage shoulder 50 of its function pawl (similar to pawl 46), so that when it is thereafter actuated toward the left by bail 36, its function operating lever (similar to lever 53) will be rotated countercloclc wise to become latched by its associated lever 61. As said operating lever 53 was rotated counterclockwise, the bar 103 was actuated toward the left to present its de pending portion 105 immediately in front of the shoulders 106 and 107 when the bars 121, 101 and 102 are in their normal position Shown in Fig. 1. It should be recalled that the line feed on carriage return bar 102 was actuated simultaneously with the bar 1011, thereby effecting a line feed operation.

Assuming, now, that the lever 53 (associated with the carriage return function bar) is latched by its latch lever 61, and the associated pawl 46 is in its dotted line position 67, and the bar 103 is held in its leftward position by said lever 53, the timing of operation of the stripper bail 65 is such that it is actuated from its normal posi tion (shown in Fig. l), first, downwardly to impinge against projection 65 of latch 61 to permit lever 53 to become unlatched. However, lever 53 will not at this time become unlatched because it will still be held in its counterclockwise position since pawl 46 still remains in its dotted position 67. Then, when the bail 66 is raised to its uppermost reciprocating position, the latch 61 will re-engage the lever 53 before the pawl 46 is released from function bar 101. Therefore, bar 103 will be retained in its leftward position during the next successive selective autuation of bar 101, thus preventing the rightward or selective movement of bars 121 and 1102, thereby suppressing a line feed operation, It is thus noted that, in this manner, in response to a CRCR--LF sequence, a line feed operation is permitted during the first carriage return operation, but is suppressed during succeeding carriage return and/or line feed selections in the same sequence.

Thus, in accordance with the present invention the selective operations of both the line feed and the line feed on carriage return function bars are suppressed after the first carriage return signal of a predetermined sequence has been received. Moreover, the present invention provides a function suppression means automatically effective after the first of a succession of related function responses. Of course, it is understood that other arrangements may be devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. In a page printer including a type carriage and a platen carriage, carriage return means, line feed means, character spacing means for moving one carriage with respect to the other, selector mechanism comprising a plurality of code bars arranged in superposed parallel planes, signal responsive means for controlling the permutative positionment of said code bars, a plurality of function bars slidably mounted for movement toward and away from said code bars, said plurality of function bars including normally selective carriage return and line feed function bars, a special function bar invariably operated simultaneously with said carriage return bar, a carriage return auxiliary bar, and means controlled by said carriage return auxiliary bar upon its initial operation for pre venting the selective operation of said normally selective line feed function bar and said special function bar.

2. In a telegraph printer, selector mechanism comprising a plurality of permutation bars arranged in superposed parallel planes, a plurality of function bars slidably mounted for movement toward and away from said permutation bars, the leading edge of each function bar adapted to cooperate selectively with said permutation bars, a bail member constantly contacting said leading edges to hold said function bars away from said permutation bars against the action of individual springs which normally tend to urge respective function bars toward said permutation bars, a secondary member associated with each function bar and disposed thereabove, spring means individually associated with said secondary members to urge said secondary members in a direction toward said permutation bars, each secondary member provided with an engaging portion adapted to be interengageable with an engaging portion on its associated function bar, means for operating said bail member periodically to enable movement of said function bars toward said permutation bars by said individual springs, whereby one of said function bars is selected according to a permuted setting of said permutation bars to effect cooperative interengagemen-t between the engaging portions of said selected function bar and its respective secondary member, whence, upon the return movement of the selective function bar by said bail, said secondary member is actuated positively, a lateral projection on said secondary member, operating means controlled by said lateral projection to control the initiation of a function, latching means for said operating means, means articulated to certain of said operating means effective to restrain the operation of predetermined others of said function bars, and periodically operated stripper means effective to successively render said latch= ing means ineffective and to disengage said secondary member from said selected function bar, whereby pursu'ant to the sequential operation of predetermined func tion bars, the performance of one of a predetermined function is limited to a single operation.

3. in a page printer including a type carriage and a platen carriage, a carriage return means, line feed means, character spacing means for moving one carriage with respect to the other, selector mechanism comprising a plurality of code bars arranged in superposed p arallel planes, signal responsive means for controlling the permutative positionment of said code bars, a plurality of function bars slidably mounted for movement toward and away from said code bars, said plurality of function bars including normally selective carriage return. and line feed function bars, a special function bar invariably operated simultaneously with said carriage return bar, a secondary member associated with said carriage return function bar and disposed thereabove, said secondary member provided with an engaging portion adapted to be interengageable with an engaging portion on its associated carriage return function bar, means to effect cooperative interengagement between said engaging portions, an operating instrumentality associated with said carriage return function bar, means on said secondary member for actuating said instrument-ality, and means articulated to said instrumentality effective to prevent the selective operation of said line feed function bar and said special function bar.

4. In a telegraph printer, selector mechanism comprising a plurality of permutation bars arranged in superposed parallel planes, signal responsive means for controlling the permutative positionment of said permutation bars, a plurality of function bars slidably mounted for movement toward and away from said permutation bars, said plurality of function bars including normally selective carriage return and line feed function bars, a special function bar invariably operated simultaneously with said carriage return bar, a secondary member associated with each function bar and disposed thereabove, each secondary member provided with an engaging portion adapted to be interengageable with an engaging portion on its associated function bar, means to effect cooperative interengagernent between said engaging portions, whereby said secondary member is actuated positively, an operating instrumentality associated with said carriage return bar, means on said secondary member for actuating said instrumentality, and blocking means articulated to said instrumentality and controlled by said carriage return bar, said blocking means effective upon the initial operation of said carriage return bar to prevent the selective operation of said normally selective line feed function bar and said special function bar.

5. In a page printer including a type carriage and a platen carriage, a carriage return means, line feed means, character spacing means for moving one carriage With respect to the other, selector mechanism comprising a pinrality of code bars arranged in superposed parallel planes, signal responsive means for controlling the permutative positionrnent of said code bars, a plurality of function bars slidably mounted for movement toward and away from said code bars, said plurality of function bars in cluding normally selective carriage return and line feed function bars, a special function bar invariably operated simultaneously With said carriage return bar, a secondary member associated with said carriage return function bar and disposed thereabove, each secondary member provided With an engaging portion on its associated function bar, means to effect cooperative interengagement between said engaging portions, an operating instrumentality associated with said carriage return function bar, means on said secondary member for actuating said instrumentality, latching means for said operating instrumentality, means articulated to said instrumentality to prevent the selective operation of said line feed function bar and said special function bar, and periodically operated stripper means effective to successively render said latching means ineffective and to disengage said secondary member from said selected carriage return function bar.

References Cited in the file of this patent UNITED STATES PATENTS 2,701,823 Madsen a Feb. 8, 1955

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456078A (en) * 1965-09-20 1969-07-15 Teletype Corp Retraction type carrier mechanism
US3504780A (en) * 1967-03-08 1970-04-07 Siemens Ag Line shift device of electrically operated tele-communication typewriters
US4531850A (en) * 1980-04-15 1985-07-30 Ing. C. Olivetti & C., S.P.A. Line spacing device for printing machines
US20080166895A1 (en) * 2007-01-04 2008-07-10 Whirlpool Corporation System for Supplying Service From an Appliance To Multiple Consumer Electronic Devices

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701823A (en) * 1953-11-16 1955-02-08 Teletype Corp Line feed mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701823A (en) * 1953-11-16 1955-02-08 Teletype Corp Line feed mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456078A (en) * 1965-09-20 1969-07-15 Teletype Corp Retraction type carrier mechanism
US3504780A (en) * 1967-03-08 1970-04-07 Siemens Ag Line shift device of electrically operated tele-communication typewriters
US4531850A (en) * 1980-04-15 1985-07-30 Ing. C. Olivetti & C., S.P.A. Line spacing device for printing machines
US20080166895A1 (en) * 2007-01-04 2008-07-10 Whirlpool Corporation System for Supplying Service From an Appliance To Multiple Consumer Electronic Devices

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