Oct. 20, 1953 R. HELL 2,656,240 RECORDING APPARATUS FOR THE RECEPTION OF MESSAGE CHARACTERS Filed June 8, 1950

3. SSSEE 56632 it 3%

ri Patented Oct. 20, 1953 2,656,240

UNITED STATES PATENT OFFICE 2,656,240 RECORDING APPARATUS FOR THE RECEP TON OF MESSAGE CHARACTERS Rudolf Hell, Kiel-Dietrichsdorf, Germany, as signor to Siemens & Halske, Aktiengesellschaft, Berlin-Siemensstadt and Munich, Germany, a German corporation Application June 8, 1950, Serial No. 166,805 In Germany December 20, 1948 17 Claims. (C. 346-35) 1. 2 My invention relates to recorders, generally type, where the slow or incrementally advanc of the facsimile type, for translating a sequence ing paper sheet passes around a fast-revolving of received scanning pulses into directly recorded backing drum, it was found necessary to choose neSSage characters. a relatively large drum diameter. This results Such facsimile recorders operate on a scanning i. in an undesirably large distance between the principle which involves resolving the "picture' backing drum and the paper feed devices. If a area of each character into separate picture ele message is to be cut off immediately after its ments in the manner elucidated in Fig. 1 of the reception, the sheet must be advanced an amount drawing by the example of the letter "E.' AS at least equal to the just mentioned distance shown, the picture area of the character is broken so that much paper is wasted and a more fre up, for instance, into seven Scanning lines or quent replacement required. Furthermore, the strips to 7 extending vertically across the area. magnet system must be reset to the Starting posi The first scanning line is vacant. The second tion after each scanning of a line of characters. line traverses the first One of the Vertical Strips Due to the relatively large mass of the magnet of the character and requires five pulses corre systems in the known recorders and the short sponding to the five area, elements occupied in ness of the available time, the resetting demands this line by the character. The following scan a considerable amount of structural means and ning lines 3 to 6 involve three or two pulses also a special line-change signal pulse. corresponding to the number of area elements Referring to recorders for the reception of occupied by the character in these respective characters according to the above described or lines. The Seventh Scanning line is again free similar methods, it is an object of the invention of occupied elements. to provide a recorder design and performance The transmitter has a usually mechanical that, as regards one or several of the above men apparatus which, for instance, upon actuation tioned aspects, is greatly improved over those of the letter key “E” sequentially issues the pulses 23 heretofore available. More specifically, the in corresponding to the scanning lines to 7. In a wention aims at reducing the Spacing between similar manner, the other letters or characters the recording place and the paper feed means. are broken up into lines of picture elements. Still another object of the invention is to mini There are also transmitting apparatus in which mize the space requirements of the means con the pulse emission is controlled not by a key 30 tacted by the back of the paper sheet at the board, but by a perforated five-unit code tape as printing place. It is also an object of the inven known for teletypewriters. tion to devise a page recorder readily suitable The above described known method of trans for making several copies. mitting message characters is suitable for tape Referring to facsimile page-printing recorders recorders as Well as page recorders. A known 5 5 of the general type above mentioned, and accord design of page printing apparatus has a revolv ing to a feature of my invention, the paper back ing drum equipped with ridges that extend ing device, heretofore consisting of a ridged or axially along the drum surface and have a mutual futed drum, has one or several OScillatory bars Spacing corresponding to the length of the scan which contact the paper behind the printing ning lines, i. e., to the height of the message 40 hammer at a point displaceable across the char characters. The recording sheet passes around acter area by an upward or transverse shifting the drum. While the drum is revolving at a movement inparted to the bars by a reciprocating peripheral Speed corresponding to the speed at drive such as a cam mechanism. This affords a which the individual vertical scanning lines of considerable reduction in the space requirements the character picture areas are scanned in the of the backing device and also results in a greatly transmitter, the paper sheet is advanced at a reduced distance between the printing place and much slower speed either continuously or step the paper feed means. Wise after recording a line of characters. An According to another feature of the invention, inking ribbon or other coloring means is pressed the necessity of resetting the printing hammer is against the sheet surface in the rhythm of the eliminated by providing a unidirectionally rotat received pulses by means of a magnet system ing endless band or the like in front of the record travelling along the drum, thus printing the sheet and mounting several hammer members characters to be recorded. on the band with a mutual spacing sufficient In practice, such recorders still present con to place only one of the hammer members at a siderable problems. In page recorders of this 55 time into printing relation to the sheet. 2,656,240 ry 4. These and other objects, features and advan All five bars are individually pulled by springs, £3.9es of shy invention will he apparent from the Schematically shown at 25 and 27 in a direction following in conjunction with the drawings, in away from the paper and normally rest against wich: two control shafts 2S and 29. The two shafts Fig. 1, already discussed, elucidates the known are driven by respective gear pairs 30, 3, 32, 33, Scanning or integrating principle also applicable from a shaft 34 which is coupled with a motor 35 for recorders according to the invention; and revolves at Such a speed that each complete Fig. 2 shows Schematically and in perspective revolution of shafts 28 and 27 corresponds to an embodiment of a page recorder according to the period of a single scanning line. As appar the invention having a Stationary magnet Sys ent from Fig. 3, five cam members Schematically ten, a translatory printing hammer controlled shown at 25 are disposed on each of the shafts by the magnet system and a backing bar device 28 and 29. The cans of each shaft are helically consisting of five bars; displaced relative to the axis of the control shaft Fig. 3 shows on a larger scale the side view and with a unifornia angular spacing. of a detail of the recorder according to Fig. 2; In Figs. 2 and 3 the mechanism is shown at a Fig. 4 shows schematically and in perspective moment in which one of the cams 25 presses the another embodiment of a page recorder accord ledge 6 in opposition to its spring bias against ing to the invention having continuously rotat the record sheet 4. When, within this time inter ing printing hammers and a backing device with Val, the appertaining printing hammer 7 is Only one backing bar. 20 forced by the magnet 8 against the other side In the interest of lucid illustration, the sta of the sheet 4, the vertical printing edge of the tionary Support Structure of the recorder shown hanner head forces the inking ribbon 2 against in Fig. 2 is represented Only by Some appertaining the sheet and against the ledge 6 at a small pres Or rigidly attached bracket members and 2. Sure area. Which corresponds to one of the picture Mounted on the support structure is a paper feed elements of the One line then being scanned in device from whose drun 3 the record paper 4 the transmitter. After a small angular rotation passes over a stack of backing bars 5, 6, 7, 8, 9 of the control shafts 28 and 29, the next upper of and then between guide rollers. O and . the cans 25 moves toward the ledge and forces Located in front of the paper is an inking rib this ledge forward into engagement with the bOn 2, partially shown, whose feed device is not 30 sheet 4, while the ledge 6 is withdrawn. Then, illustrated because it may be similar to that cus if the printing hammer i is active, an adjacent Onary for typewriters. A guide l'ail 3 extends elemental area of the same scanning line is a CrOSS the paper Surface and is mounted on brack in arked. Due to the helical displacement of the ets 4 and 5. Slidably mounted on rail 3 is a caims, the ledges of the backing device are thus sleeve iS which carries a printing hammer 17 S 5 Sequentially actuated, the lowermost becoming Serving as an intermediate pressure-transmitting active While the uppermost ledge is being with member between the record surface and the actu drawn. It will be recognized that the operation atting magnet System. The magnet system 8 has of this backing device, as regards the resulting a lilovable armature 9 mounted on a shaft 20 printing performance, is similar to that of a Which is revolvably journalled in the brackets f4 revolving ridged drum, but it has the advantage and 5 and equipped with arms 2 and 22 which that the movement of the ledges is only toward Caltry a pressing bar 23 in front of the hammer and away from the paper without any tendency is and along its path of displacement. The bar to tear the paper sheet or to move it in an 23, when actuated by the magnet 8 against the undesired Way. tension of the Spring 24 in the rhythm of the The printing hammer 1 with its guiding sleeve Signals received by the magnet, hits against the 6 is continuously moved from a starting posi hanliner member and forces it against the tion at the left toward the right in synchronism record paper, thus causing the ribbon 2 to pro With the advancing speed of the scanning in the dice a mark on the paper surface. transmitter. This movement is imparted to the A stack of pressure bars comprising five indi sleeve 6 by a rope 38 wound up on a drum 3, vidual bars 5 to 9 is disposed behind the paper which is driven from the shaft 34 of the motor A and extends over the entire width of the sheet. 35 through a worm gear 38 and a magnetic cou The individual bars 5 to 9 of the stack are dis pling device. 39. posed One above the other in close relation to Thus, the movement of the sleeve :6 continues One another, but are out of contact. With the until the coil 4 of the magnetic coupling de paper When in their respective rest positions. Vice 39 is energized. Then the armature 4 , The total height of the stack is in accordance novably mounted on an edge 22, is attracted and With the length of a picture-scanning line and, of its arm 43 raises the upper coupling part 44 course, With the maximum height of the charac which is joined with the drum 3 and which is ters to be Written. 6) axially displaceable on shaft 43. Thus the up One of the bars at a time is moved forward per coupling pait is and the drun 31 are dis against the record paper 4 so that the bars engage engaged from the lower coupling part 43 mount the paper in a given sequence, each bar being ed rigidly on the driven shaft 4S, and the drum returned to the start position as soon as the next 3 is permitted to rotate backwards. This is done bar is in contact with the sheet. After the last by a pull rope 47 connecting the sleeve 6 with a bar having thus been operated in sequence to the rewind-drum 48. This drum is actuated by a others, the first bar will begin the next cycle. return Spring 49 for rapidly returning the sleeve In this manner, the line contact of the backing 6 and haminer f to the starting position. An device with the paper sheet 4 travels always in elastically movable stop member 53 mgunted on the paper feed directicn (or opposite thereto) the rail f3 daimpens the impact, and is displaced With a resultant backing effect similar to that toward the left when the hammer assembly obtained with fluted backing drums, while occu reaches the starting position. This displace Pying considerably less Space than required by ment of member 53 serves to actuate a control Such drums. The means for securing this per contact (not shown). The control circuit of cou formance will be described presently, 75 pling magnet 40 is energized by the reception of 2,656,240 5 6 a special reset signal, for instance a continuous In recorders according to the invention, the signal or a given frequency modulated signal, reciprocating printing assembly can be replaced, and becomes deemergized under control by the as mentioned, by a unidirectional-motion device just-mentioned contact of member 50 when the with an endless band or the like rotating in front hammer assembly is returned to its start posi of the record paper and carrying several sequen tion. This operation can be obtained by various tially operable hammer members. The recorder known circuit combinations of relays and shown in Fig. 4 represents an embodiment of this SWitches whose particular design is not essential type in connection with another form of the to the invention proper. backing ledge device. However, the drum 37 becomes coupled with 0. In the recorder according to Fig. 4, two sheaves the motor 35 only when thereafter the coupling 60 and 6, one of which is driven, are rotatably members 44 and 45 reach a correct phase posi mounted in front of the paper sheet, 4 and Sur tion relative to each other. Consequently, after rounded by an endless steel tape 62 which carries the resetting of the printing hammer f7, its next four printing haminers 63, 64, 65 and G. The advancing movement will start only after a pe edge-like hammer faces engageable with the riod of time determined by the angular displace sheet 4 have a length at least equal to the height ment of the coupling members 44 and 45. of the lines of characters to be printed. It is, of course, also possible to control the re The tape 62 rotates in the direction of the turn movement of the hammer assembly only arrow 6 at a speed corresponding to the advanc mechanically and to replace the illustrated cou 20 ing speed of the scanning performance in the pling by a simple friction coupling with electric transmitter. During this travel, only one of the Or mechanical releasing means. four printing hammers at a time is located in In the illustrated example, the position of the front of the paper. A pressing bai' is extends pressing bar 23 relative to the backing bars 5 to 9 across the paper sheet 4 Within the area, Sur can be accurately adjusted. For this purpose, rounded by the band 62. Two magnets 89 and the entire printing Systern is mounted on a dis have respective armatures and 2 connected placeable plate 5 which is biased by springs 52 with the bar 68 to force it toward the adjacent and 53 toward the stationary brackets ? and 2. portion of the band 62, thus pressing the one Spacing screws 54 and 55 pass through corre hammer engageable with the bar against the Sponding openings of brackets and 2 so that paper surface. At this moment, in cooperation the distance between plate 5 and brackets 1, 2 with the backing device still to be described, a and hence the distance between the printing mark is produced on the paper with the aid of an System and the backing ledge device can be varied inking ribbon (not shown). The magnets 69 by turning the adjusting screws 54 and 55. For and 70 are energized in the rhythm of the re facilitating an accurate adjustment, the spacing ceived signals So that the individual characters screws 54 and 55 may be preferably equipped are printed in the integrating anner explained with large knurled heads (not shown). previously. If the use of a special reset, signal is undesired, The distance between the hammers 63, 64, 65 the release of the hammer return movement may and 66 along tape 62 is preferably equal to the also occur automatically after completing the length of a line of characters so that When a line printing of a line of characters, for instance, by is completed, the printing of the next line is in. locating a limit, Switch with a control member mediately started. However, if it is desired to similar to member 59 at the right, hand end of obtain some overlapping so that, when the last the hammer path. few characters of a line are being printed, the If the receiving recorder is to be intermit : 5 Sane characters are simultaneously printed by tently synchronized with the transmitter as re the next hammer at the beginning of the next gards the printing periods for complete lines of line, then the distance between the hammers characters, that is, if the recording of each line must be made somewhat shorter than the length of characters is to begin at a given moment dic of the line. It will be recognized that an endless tated by the transmitter, the arrangement is de- i. band device with several sequentially operating signed in such a manner that after each release hammers does not require resetting so that, a of the hammer return movement a predeter reset signal or limit switch control means are mined period of time will elapse before the print not needed. However, a reset signal may be ing hammer f is again advanced across the used, if desired, for rapidly advancing the band at, sheet. For instance, it is advantageous to make higher than normal speed to the start position of this predetermined period about equal to that the next operative hammer after recording less required for the transmission of a complete, in than a full line of characters. dividual message character. For coloring the record surface under control In the illustrated recorder, the record sheet by the printing hammer, a carbon paper may be may be fed in continuous motion at such a speed used instead of the above mentioned inking rib that gaps will normally occur between succes bon. The carbon paper may be placed between sive lines of characters. Then, the spacing be the record sheet and hammer, or between record tween the lines of print will become smaller than sheet and backing device. When providing an normal when only a part of a character line is inking ribbon, an automatic reversal of the rib printed and the printing of the next line will 5 bon feed may be provided similar to that cus. begin immediately. To avoid Such an uneven tomary for typewriters. While the ribbon feed spacing, the paper sheet may be fed intermit. may be continuous, it is also possible to provide tently in steps corresponding to the individual a feed control device which moves the ribbon in character lines, the paper feed movement being predetermined intervals of time and in steps cor released by the resetting of the sleeve 6 and the responding to the width of the record sheet, so printing hammer . In this case, the paper that the inking ribbon is stationary during the travel for each step of feed movement is equal printing of each line of characters. For obtain to or larger than the height of a character de ing a visible print, the coloring may also be pending upon the desired spacing between the effected by an endless coloring sheet whose width lines of characters. 75 corresponds Substantially to that of the record 2,656,240 Py 8 sheet and which extends along the back of the movable armatures 7 and T2 act through respec sheet. With a transparent record paper, this tive pressure rods 88 and 89 on the pressure bar device will produce the print on the back Sur 68 which, like those of the preceding embodi face of the sheet to be read from the front of ments, extend in the sequence direction of the the sheet. characters to be printed across the front Side of It is also possible to use beneath the record the record paper. The connection between the sheet a copyable inking ribbon or coloring sheet magnet armatures 7 and 72, the preSSure rods in addition to an ordinary inking ribbon in front 88 and 89 and the pressure bar 68 may be effected of the record sheet. Then two prints are ob through movable joints so that the two magnet tained at both sheet surfaces, of which the One 0. systems are not rigidly coupled with each other. appearing on the back surface is mirror-reversed This arrangement is desirable to permit both and can be used for printing additional copies in magnets to develop their full operating power. accordance with a known reproduction method. The above mentioned motor 8 may be used, Several copies may also be produced by inserting as shown, also for driving the endleSS Steel tape several record sheets with intermediate sheets of 5 or chain 62 carrying the printing hammerS 63 carbon paper or using several record Sheets whose to 66. Sheave 6 is rotated by the motor shaft back surfaces are carbonized. through a worm gear 90. The other sheave 60 The feed movement of the record paper A in is mounted on the pivoted arm 9 of a tensioning the apparatus according to Fig. 4 may be con device biased by a Spring 92 to maintain the end tinuous in the direction of the arrow 73. AC leSS tape 62 under proper tension. cording to another feature of the invention, the As is apparent from the illustrated and de sheet 4 may be guided in a Slanted direction rela scribed embodiments, my invention permits of tive to the tape 62, the angle of Slant being Such various and diversified modifications, and it will that, with a continuous paper feed movement, be readily understood by those skilled in the art, the difference in height between the left and 2 5 upOn a Study of this disclosure, that various al right ends of one and the same line of characters terations and modifications other than those is just compensated by the slanted arrange Specifically referred to can be made without fore ment. To this end, the sheet at the left side is going the objects or advantages of the invention guided higher than at the right side by an amount and within the Scope of its essential features set equal to the height of a character plus the line 30 forth in the claims annexed hereto. spacing. Another possibility consistS in applying I claim: a straight direction of paper feed and placing 1. Facsimile page printing apparatus, com the line printing device in a slanted direction to prising paper feed means, a paper backing de the paper. vice containing reciprocable bar means having The record sheet A moves upwards between rol- 3 line contact With the paper transverse to the ers 74 and 75. The backing device behind the paper feed direction and over the entire length sheet may be the same as in Fig. 2 or, as illus of the lines of characters to be printed, cycli trated, it may have only one bar member 75 cally operating drive means connected with said edgewise contacting the paper acroSS the paper bar means to impart reciprocating motion there Width. The bar member 6 is mounted on Spring to for periodically moving said line contact in strips and 72 which are drawn downwards by Said direction a distance corresponding approxi springs 89. Two axially projecting dog pins 8 mately to the maximum height of the characters and 82 of bar 6 are pressed against respective to be printed, hammer-like printing means mov control cams 83 and 84 mounted on a can shaft able across said paper feed direction at the paper 85. During the operation of the recorder, the Side away from said backing device and having revolving can shaft 85 causes the cans to lift an elongated hammer face extending in said the bar 76 at a relatively low Speed, while the paper feed direction over said height, signal springs take care of rapidly returning the bar responsive means, and means connecting said to a lowermost position determined by the bot Signal-responsive means with said printing tons of the can contOurs. The upward move means for actuating said printing means toward ment of the backing bar 76 has a uniform speed the paper to produce marks on the paper at the corresponding to the line-Scanning Speed of the CrOSSing points of Said printing means With Said transmitter. In the illustrated embodiment, the bar means. backiing bar 6 moves about the pivot points of 2. Facsimile page printing apparatus, com the strips 8 and 19. However, a more accurate prising means for moving a recording sheet, os parallel notion of the backing ledge can be pro cillating sheet backing means extending over the vided, for instance, by arranging a pair of Spring width of the sheet across the direction of sheet Strips at each axial Side of the bar. In OWeinent and having With the Sheet a line The can shaft 85 is driven through gears 86 engagement of Oscillatory novelinent parallel to from a motor S to perform one full revolution 60 said direction over a range Substantially equal Within the period. Of One Scanning line. For in to the maximum height of the characters to bse Stance, When the transiinission corresponds to printed, an intermediate member displaceable the Scanning method explained in the forego transverse to said direction at the sheet side ing with reference to Fig. 1, seven revolutions of opposite said backing means, said member hav the can shaft 85 occur during the period of time ing an elongated hammer face extending in said required for the Seven vertical Scanning lines to direction over said range, and movable control cover the entire picture area of a single chair means responsive to received signals and en acter to be transmitted. Suitable phase adjust gageable With Said member for moving said ing means (not shown) are provided to secure member to Ward Said backing means. the proper phase relation of the movements of 3. Facsimile page printing apparatus, com ledge 76 relative to the Sequence of scanning sig prising paper feed means, a paper backing de nals received by the recorder. vice having oscillatory bar means extending over For printing the characters on the sheet 4, the width of the paper transverse to the paper the embodiment of Fig. 4 is equipped with tWO feed direction and being edgewise engageable stationary magnets 69 and 70, whose respective With the paper to form a line contact therewith, 2,656,240 10 periodic drive means connected with said bar bers extending across the record sheet and hav means for reciprocating said line contact par ing respective longitudinal edges facing the allel to said direction a distance substantially Sheet, said bar members being individually mov equal to the maximum height of the characters able toward the sheet, and reciprocating drive 5 means having a revolvable shaft and a group of to be pivoted, an intermediate member dis Cam means on said Shaft, said can means being placeable transverse to said direction at the angularly displaced relative to each other and sheet side opposite said backing device, Said engageable with said respective bar members member having ai elongated hammer face for Sequentially moving them in a given cycle. facing said backing device and extending in said 10. Facsimile page printing apparatus, com direction over Said distance, and control means O prising paper feed means, oscillatory backing responsive to received signals and engageable 18ans having a line contact with the paper in with said member for applying printing pressure a direction transverse to the paper feed and thereto. reciprocable transverse to said direction a dis 4. Facsimile page printing apparatus coil pris tance Substantially according to the height of ing paper feed means, a paper backing device the individual lines of characters to be printed, having OScillatory bar means extending over the a Signal-responsive magnet having an arnature, width of the paper across the paper feed direc a plurality of printing hammers unidirection tion and having with the paper a line contact ally inovable parallel to said direction at the reciprocable parallel to said direction a distance paper Side away from Said backing means, Said substantially corresponding substantially to the hammers being Spaced from each othei" in said maximum height of the line of characters to direction a distance similar to the length of said be printed, oscillatory-motion drive means con lines of characters, each of said hammers hav nected with Said bar means, a signal-responsive ing an elongated hanner face transverse to said magnet having an armature, a hammer nember direction and of a length similar to said height, displaceable transverse to said direction and ; Said hammer faces being located opposite said movable toward the paper at the paper side backing means, a hammer control bar extending Opposite said means, said harner nenber hav acroSS the paper in Said direction and being ing an elongated hammer face extending in Said movable toward said hammers to apply printing paper feed direction over said distance, drive preSSure thereto, and means connecting said means of substantially constant speed connected armature with said bar for controlling said bar With Said member for displacing said member, by Said magnet. a hammer control bar extending along the path ii. Apparatus according to claim 10, cornpris. of Said member and being movable against said ing an endless and drive of uniform Speed hay member to apply printing pressure thereto, and ing a band neinber extending across the paper means Connecting Said bar. With Said arnature parallel to Said direction, Said hammers being for actuating said bar under control by signals mounted on said band member. received by said magnet. 12. Facsimile page printing apparatus, conn 5. Facsimile page printing apparatus, con prising paper feed means, oscillatory backing prising paper feed means, backing means having means having a line contact with the paper in a a Single bar member extending over the Width direction transverse to the paper feed and re. Of the paper transverse the paper feed direction ciprocable transversely to said direction a distance and having a longitudinal edge directed toward substantially according to the height of the indi the paper, Said bar being reciprocable parallel vidual lines of characters to be printed, a signal to Said direction a distance corresponding to the responsive magnet having an armature, a han height of the line of characters to be printed, iner nember displaceable in said direction aid an intermediate linember displaceable transverse movable toward the paper at the paper side away to said direction at the sheet side opposite said from Said backing means, a hainner control bar backing means and having an elongated ham extending along the displacement path of Said ner face extending in said direction over said member and being movable against said member distance, and movable control means responsive to apply printing pressure thereto, said bar ceiling to received signals for moving said member to connected with Said arnature to be controlled Ward Said backing means. by Said Iaagnet, hanraer displacement, control 6. Apparatus according to clairil 5, comprising means having a constant-speed drive operative reciprocating drive means connected with said in the character printing direction, and reset, bar member and having slow forward strokes 5 5 means having a higher Speed thai said displace and fast return strokes, said forward strokes ment control means and being operative in the being coincident with respective operating Opposite direction, and release ineans connected periods of said control means. With Said control Imeans to render said reset 7. Apparatus according to claim 5, comprising means effective before starting the recording of a a drive having a continuously revolvable shaft 60 line of characters. and a control can on said shaft, said can be 13. In a recorder according to claim 12, said ing in engagement with said bar member and release means being electric and having a circuit shaped to impart to said bar member a slow responsive to receipt of a special reset signal. forward stroke and a fast return stroke. 14. A recorder according to claim i2, coinapiis. 8. In apparatus according to claim 2, said 65 ing a pull rope connecting said hammer merinber backing means comprising a stack of bar mem With Said drive, and said release means being cis bers extending across the sheet and having re posed between Said pull rope and said drive to Spective longitudinal edges facing the sheet, Said disengage them from each other under control by bar members being individually movable toward Said release means, the sheet and away therefrom, and reciprocat 70 15. In a recorder according to claim 12, said ing drive means connected with said bar men reset means having a return spring connected bers for sequentially moving them in a given With Said hammer member and biasing it toward Cycle. a given Start position. 9. In apparatus according to claim 2, Said 16. In a recorder according to claim i2, said backing means comprising a stack of bar men 75 release Ineans being connected with said drive foi

-m- 8,866,840 11 disconnecting said drive to then permit said reset 12 means to return said hammer member to the References Cited in the file of this patent start position, and limit contact means controlled by said hammer member in said position to recon UNITED STATES PATENTS nect Said drive. Nune Name Date 17. A recorder according to claim 12, compris 2,131,741 Kleinschmide et al. --- Oct. 4, 1938 ing coupling means disposed between said drive 2,246,003 Rich ------June 17, 1941 and said hammer member and having two parts 2,280,613 Avey ------Apr. 21, 1942 connected with said drive and said member re 2,298.276 Burcky et al. ------Oct. 13, 1942 spectively and drivingly engageable with each other only in given mutual phase positions where FOREIGN PATENTS by Said drive becomes effective only after elapse Number Country Date of a given period of time after resetting of said 425,883 Great Britain ------Mar. 22, 1935 membel'. 812,688 France ------Feb. 8, 1937 RUDOLE HELL. 15