Oct. 20, 1953 R. HELL 2,656,240 RECORDING APPARATUS for the RECEPTION of MESSAGE CHARACTERS Filed June 8, 1950
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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.