DE1059930B - Key-controlled printing unit for typewriters with rotatable and slidable type cylinder - Google Patents

Description

There are printing units for typewriters are known in which a type cylinder for setting for the Imprint is both axially displaced and rotated. The setting is done by a pointer, which is connected to the type cylinder via a gear, and the stop occurs after the Adjustment by pressing a single button. There are also printing units for typewriters an adjustable type cylinder known by cables, which only with a few, z. B. equipped with seven buttons are. For the setting of the type cylinder, a certain combination must be used for each letter the buttons are operated. However, these printing units still require a paper trolley that is shifted by one letter step in the line direction after each type stop, and the axial Shifting the type cylinder is only used to select the letter to be displayed. To the reprint of the letter, the type cylinder is moved against the paper roller.

Another well-known printing unit for typewriters uses instead of a paper roller as Pressure abutment a hammer that pushes the sheet of paper to be inscribed from backwards against a type cylinder presses. This typewriter also has a paper carriage that can be moved in the line direction.

A typewriter is also known which adjusts the type wheel by means of control rails which are arranged perpendicular to the key levers and which are provided with sawtooth-shaped incisions. It is also known in teletyping machines to move the type basket in relation to the sheet of paper to be labeled and to advance the sheet of paper only line by line: '■' - '.' ■

All of these devices work very slowly, as for. the adjustment of the type cylinder large masses must be moved. Another disadvantage is that the keyboard in most of the known devices differs completely from the keyboards used in conventional typewriters. ■ ~ ■? ■.

The 'subject matter of the invention avoids this Disadvantages of type cylinder printing units for typewriters, especially small typewriters, with one that is longitudinally displaceable and rotatable when the button is actuated by drive cables guided over pulleys Type cylinder and line-by-line adjustable recording medium in that when striking a key of the associated key lever control rails with pulleys arranged on them in per se moves in a known manner and thereby guided by means of these and fixed pulleys Cable pulls the type cylinder in the printing position Key-controlled printing unit

for typewriters with rotary

and sliding type cylinder

Applicant:

IBM Germany
International office machines

Gesellschaft mbH,
Smdelfingen (Württ), Tübinger Allee 49

Claimed priority:
V. St. v. America January 19, 1953

John Edwin Hickerson, Wappingers Falls, N.Y.

(V. St. A.),
has been named as the inventor

compared to that in itself. known print hammer brings the electromagnetically driven print hammer triggers the type cylinder and the print hammer via a lever and a step-by-step mechanism Adjusted by one switching step in the writing direction.

Another feature of the invention is a key-operated system formed by a ratchet system Stepping mechanism for the gradual shifting of the printing mechanism with the one driven by spring force Ratchet wheel and the firmly connected pulleys for the various cables.

The advantage of the invention lies in its type

.-. cylinder pressure for. Typewriters that itself especially for small typewriters that can be produced at low cost with a particularly flat design. . -As a result of the small size of the Type cylinder enables the with the object

- ' ^: The machine equipped with the invention has a high operating speed, as it has been so far from the known printing units for typewriters. could not be achieved with type cylinders. -

Further features of the invention emerge from the patent claims and the description. The invention is explained below using an example with reference to drawings. The drawings have the following meaning:

Fig. 1 is a perspective view of the

- typewriter ;: - _;

909 558/10

Fig. 2 is a perspective view of the type cylinder;

Fig. 3 is a development of the type cylinder;

4 shows a position of the type cylinder in relation to the printing hammer with parts of the machine;

Fig. 5 is a section 5-5 of the article in Fig. 4 looking in the direction of the arrows;

6 is a perspective schematic illustration of the lateral movement of the type cylinder effecting organs;

Fig. 7 shows schematically the organs causing the rotation of the type cylinder;

Fig. 8 shows schematically the organs required to move and trigger the print hammer;

9 is a perspective view of the exchangeable type cylinder with the receiving device;

Figure 10 is an overview of the basic elements shown in Figures 6, 7 and 8;

11 is a section through the exchangeable type cylinder with the receiving device;

Fig. 12 is a section 12-12 of the article in Fig. 10 looking in the direction of the arrows;

Figure 13 is a section 13-13 of the article in Figure 10 looking in the direction of the arrows;

14 shows the arrangement of the key levers in relation to the control rails.

The type cylinder 4 (Fig. 2) has the shape of an octahedral prism, of the surface of only seven Areas are each equipped with six types. The characters are aligned in columns on each surface, d. that is, each character is either above or below a corresponding character of the neighboring surfaces.

The letter "C" (Fig. 3) located approximately in the middle of the development of the type cylinder 4 is located in the printing position when the type cylinder is in the basic position 6.

The mode of operation of the type cylinder can best be explained with reference to FIGS. The sheet of paper 7 to be inscribed is inserted between the type cylinder 4 and the printing hammer 5, while the ink ribbon or carbon paper tape 8 is clamped between the paper and the type cylinder. The stop surface of the printing hammer 5 is just as wide as any type, and it presses in a known manner with each hammer blow paper and ink ribbon against the set character of the type cylinder. After each imprint of a character, the print hammer 5 and the type cylinder 4, which has returned to the basic position 6, jump to the right by one switching step width. If the key C is continuously hit, the type cylinder would advance synchronously with the hammer 5. In order to display a different character, however, the type cylinder 4 must still perform a movement relative to the printing hammer before the printing process.

According to FIG. 6, the type cylinder 4 is fastened in a bearing 9, which upon axial movement a shaft 10 slides. An anchor block 11 is attached to the bearing 9, on both sides 16 and 20 of which one each End of a rope 12 is removably attached. The type cylinder is when the cable 12 taken that both the change of the type cylinder base position 6 and that of the relative Carries out position of the type cylinder against the basic position. This dual function is made possible by the Rope 12 in cooperation with the rope pulleys 13, 14, 15, 17, 18 and 19 causes. The rope 12 runs from the one side over the pulleys 13, 14, 15, 21, 22 and

23 to the anchor bolt 25 (Fig. 10) of a drive pulley 24 and from there via the pulleys 26, 27, 28, 19, 18 and 17 back to the anchor block 11 (Fig. 6).

In the described cable arrangement, the drive pulley 24 moves the type cylinder 4 between the Pulleys 13 and 17 back and forth depending on the requirement. The movable pulleys 21, 22 and 27, 28 act here as a relative adjusting means for the type cylinder4

ίο and are arranged to each other so that they are attached to the rope apart from a switching step effected by the drive pulley 24, an additional movement can be issued can. A gradual rotation of the drive pulley 24 counterclockwise (Fig. 6) causes an adjustment of the type cylinder 4 by one letter step. This movement of the type cylinder a further movement corresponding to the adjustment of the movable rope pulleys 21, 28 or 22, 27 superimposed.

ao So that the rope always has a constant tension, every shift of the movable rope pulley 21 with respect to the fixed rope pulley 15 by an equal displacement of the movable rope pulley 28 compared to the pulley 15 are compensated. For this reason, the pulleys 21 and 28 are in one fixed distance from each other placed on a control rail 29, which is perpendicular to the button levers 33 can be moved. The second pair of movable pulleys 22 and 27 is on a second, for Control rail 29 set in parallel displaceable control rail 30. Any shift in the movable pulleys 21 and 28 in the direction of the stationary rope pulley 15 with the drive pulley stationary

24 moves the type cylinder 4 by a corresponding distance to the right (FIG. 6), e.g. B. from point B to point b. The basic position 6 of the type cylinder 4 is shifted relative to the printing hammer 5.

The ones known from certain typewriters

Control rails 29 and 30 are provided with incisions 31 according to FIG. 6, which have inclined flanks 32. The control rails can be moved laterally by moving the button lever 33 downwards. The key levers 33 (Fig. 6) cross a total of four control rails 29, 30, 53 and 54. The inclined flanks 32 end downwards in vertical slots 35 which are as wide as the key levers.

Since 42 characters are arranged in seven longitudinal rows of the type cylinder 4 in the described embodiment are, the movement of the type cylinder from the basic position 6 (Fig. 3) is a maximum of two units to the right or three units to the left.

The control rails 29 and 30 are designed so that for each letter a certain number of Inclined surfaces are actuated to move the type cylinder. It can e.g. B. by pressing the D-button lever (Fig. 3 and 14) the control rail 29 can be moved one unit to the left, whereby a displacement of the movable rope pulleys 21 and 28 by one distance unit to the right is effected and the row of characters to the left of the basic position, e.g. B. the "D" in the writing position got. On the other hand, pressing the button lever for the number 4 (Figs. 3 and 14) makes a movement of the control rail 29 by one distance unit to the left and a movement of the control rail 30 caused by two units of distance to the right. The movable pulleys 21 and 28 then move by one distance unit to the left and the movable pulleys 22 and 27 by two distance units To the right. The starting position of the standard cylinder

ders 4 moves three units to the right in this case, so that one of the at the left end of the type cylinder characters located (Fig. 2 and 3) reaches the writing position.

In addition to the axial displacement, the type cylinder 4 must also perform a rotation to any desired To be able to bring the type into the printing position. The type cylinder is used to perform this rotation 4 connected to the shaft 10 in such a way that, although it is displaceable along the shaft, at the same time but when the shaft rotates, it rotates with it. The shaft 10 is therefore with a long keyway 36 (Figs. 5 and 11) in which the wedge 37 moves. The bearing 9 for the rotation of the type cylinder is connected to the rope 12 by block 11.

The rotary movement of the shaft 10 is brought about by a gear 40 (FIG. 7) which is fastened to one end of the shaft 10 and which meshes with a drive gear 41. This is driven by the rope 43 from the rope pulley 42 firmly connected to it. The rope 43 runs from the anchor 55 attached to the typewriter frame via the rope pulleys 50, 49, 48, 47, 46, 42 and from there via the rope pulleys 44, 45, 52 and 51 back to the anchor 55. Of these pulleys, the pulleys 50 and 51 are fastened on the control rail 53 and the pulleys 49 and 52 on the control rail 54 in order to cause the pulley 42 and the gear wheel 41 to rotate when the control rails 53 and 54 are displaced. A shift z. B. the pulleys 49 and 52 to the left (Fig. 7) has a corresponding movement of a point C on the rope 43 down to a new point c, a rotation of the pulley 42 and thus a rotation of the type cylinder 4 result.

The control rails 53 and 54 are notched and are similar to the control rails 29 and 30 by the depressed button lever 33 on the inclined flanks 56 together with the pulleys 49, 52 and 50, 51 shifted laterally, whereby the described rotation of the type cylinder is effected. The control rails 53, 54 also have vertical grooves 57 as a continuation of the inclined incisions, which are used to accommodate the key levers. When you press any key lever, simultaneously the control rails 29, 30, 53 and 54 actuated, and these thus cause an axial and a rotating movement of the type cylinder 4, so that the selected character is conveyed into the printing position.

The control rails 29,30,53,54 are axial The direction of displacement is braced by springs 58 (FIGS. 6 and 10), which are attached to the opposite Ends of each control rail. The purpose of the springs 58 is to return the control rails to their normal or to reset the basic position (Fig. 10) when a key lever releases the control rails, as a Shifting the control rails always results in a movement of the type cylinder 4, which cause After each imprint of a character, the type cylinder 4 returns to its basic position. In addition to the above-described setting of the type cylinder relative to the printing point, the step-by-step Adjustment of the type cylinder in line direction a corresponding step-by-step movement of the Print hammer 5.

According to FIG. 8, a rope 60 runs around the disk 59 and serves to actuate the pressure hammer 5, which is slidably mounted on the hammer carrier 61. The rope 60, which is anchored to the drive pulley 59 on an anchor bolt 62, runs from here clockwise around the drive pulley 59, via the pulleys 75 a, 63, 64, 65, 68, 69, 70 and 75 back to the drive pulley 59. The rope is fastened at points 66 and 67 (FIG. 10) of the hammer carrier 61 between the rope pulleys 65 and 68. Since the print hammer 5 in the line direction over the entire paper. web is to move, the length of the large arc of the drive pulley 59 from point 73 to point 74 must be at least equal to the required lateral movement of the printing hammer 5. The hammer carrier 61 is slidably mounted on the shaft 76.

To ensure an even step movement from pressure point to pressure point, a Stepping mechanism 77 (Fig. 6) is provided, which controls the movement of the printing hammer 5 and the type cylinder 4 controls over the entire width of the writing line.

The stepping mechanism 77 consists essentially of a ratchet wheel 78, which is connected to the drive pulleys 24 and 59 are firmly connected, and two pawls 81 and 82. The drive pulleys 24 and 59 are dimensioned so that when the ratchet wheel 78 is indexed step-by-step, the type cylinder 4 and the hammer carrier 61 in the same size. Steps in line direction.

The pawl 81 can be rotated on a pin 84 and, due to the slot-shaped design of its bearing, can be displaced in its longitudinal direction (towards the nose — stop 83). At its rear end it is bent over to form a stop 83, against which a lever 86 seated on the shaft 87 presses when a key lever is actuated. A spring 85 pulls on the arm of the pawl 81 to press it against the teeth of the ratchet 78 and to keep the pawl 81 normally in engagement with the ratchet 78. The pawl 82, which is normally disengaged from the ratchet 78, is rotatably mounted on the pin 90 and is held by a spring 91 with its stop 93 in contact with the adjusting screw 92 at an angle of the pawl 81, so that when the pawl 81 is rotated clockwise the pawl 82 is pivoted clockwise. The adjusting screw 92 is set so that the pawl 81, when rotated counterclockwise, does not release the ratchet wheel 78 until the pawl 82 has reached the area of the ratchet teeth of the ratchet wheel. The angled stop 83 of the lever arm of the pawl 81 cooperates with the pivot arm 86 fastened on the shaft 87. A bracket 88 common to all key levers is also attached to the shaft 87.

When a key lever 33 is depressed, the bracket 88 with the shaft 87 and the swivel arm are used 86 (Fig. 12, 6) the pawl 81 is pivoted counterclockwise and the pawl 82 is pivoted clockwise. As soon as the pawl 82 has reached the area of the ratchet teeth of the ratchet wheel 78, comes the Pawl 81 disengaged from the ratchet wheel. The pawl 82 thus locks the ratchet wheel. the The pawl 81 moves in its slot-shaped bearing under the action of the spring 85 about Amount of a tooth pitch in the direction of the pawl tip. If the button lever 33 is now released again, so pivot the bracket 88 with the shaft 87 and the pivot arm 86, the pawls 81 and 82 below the action of the springs 85 and 91 return to their rest position. In the process, the pawl 82 disengages from the ratchet wheel, so that the pawl 81 must take over the locking of the ratchet wheel and as a result of its slot storage allows ratchet 78 to rotate one ratchet pitch. This will make the

Type cylinder 4 and print hammer 5 advanced by one switching step.

So that the ratchet 78 can rotate when released, a constant rotating force acts against the Stopping action of the pawls 81 and 82. This turning force is provided by a coil spring 94 (Fig. 10) underneath of the ratchet wheel 78 exercised. After each setting of the type cylinder 4 and the printing hammer 5 In the new printing position, the print hammer must be released in order to print a character cause. According to FIGS. 4 and 8, the print hammer 5 is in guides 95, 96 (FIG. 4) on the hammer carrier 61 slidably mounted. A spring 97 pulls the hammer 5 against the type cylinder 4. So that the Print hammer does not smear the imprint, it must be withdrawn immediately after each stroke will.

The required hammer actuation takes place (see Fig. 8) by means of the rope 98, which is attached at its ends to the fixed anchors 99 and 106, respectively. The rope runs from the anchor 99 over the pulley 100 of the hammer carrier 61, the pulley 101 of the pressure hammer 5, around a second pulley 102 of the hammer carrier 61, around the pulleys 103, 104 and 105 to the anchor 106. The pulley 104 is rotatable a bell crank 107 which is normally held in the locked position shown in FIG. The print hammer 5 is held against the action of the spring 97 (FIG. 13) by the cable 98 in its tensioned position. The rotary movement of the toggle lever 107 (FIG. 8) is controlled by a solenoid 108 together with the release of a latch 109. In the arrangement of the parts shown in FIG. 8, the bolt 109 is pivoted about its pin 111 against the action of the spring 121 by pulling a rod 110 in order to release the toggle lever 107 which carries the pulley 104. Assuming that the solenoid 108 is not energized at this time, the disc 104 moves upwards under the action of the spring 97, and the toggle lever 107 rotates about its pin 111 a:

In the illustrated embodiment, the solenoid is

108 to a power source, e.g. B. the battery 170 connected and connected by a conductor 171 to the other pole of the battery. To control the contact point '112 A lever 115, which is rotatably mounted on the pin 116, and the contact spring 117 with an arm are used of contact 112 touches. When the lever 115 is turned counterclockwise (FIG. 8), the Contact spring 117 moves so that contact 112 closes. Below the outer end of the lever 115 extends a rail 113, which by a spring 172 upwards against the underside of the lever 115 is pulled. The front end of the rail 113 is shown in FIG. 12 by a rod 119 with a Lever arm 120 of the shaft 87 connected. When a button lever 33 is pressed, the bracket 88 is actuated, the Rotated shaft 87 and pushed the rail 113 forward. The length of the rail 113 is set so that that its rear end moves out from under the lever 115 just before the key lever 33 is pushed to its lowest position. The latch

109 is intended to release the toggle lever 107 after the rail 113 has moved out from under the lever 115 has been.

Pressing a button lever 33 initially causes the longitudinal displacement of the selector rails 29, 30, 53 54. As a result, the type cylinder 4 is displaced relative to the print hammer 5 until that of the key lever selected character is in front of the print hammer. The bracket 88 is operated during this time to to rotate the shaft 87 and thus move the rail 113 forward. After the button lever presses the Has reached lower edges of the flanks 32, 56 on the selector rails and into the vertical grooves 35 and 57 begins to move, the rail 113 comes out from under the lever 115. Another slight pressure on the key lever causes the release of the knee lifter 107 by the bolt 109, so that the print hammer is thrown by the spring 97 against the type cylinder.

The rail 113 is raised by the spring 172 as soon as the toggle lever 107 is raised, the stroke of the rail is limited by a stop (not shown) so that the end of the Rail detected the lever 115 during the return movement. By pivoting the bracket 88 through the Key lever will also cause the pawls

ao 81 and 82 are pivoted in the manner described above. When the key lever is released, the bracket 88 is pivoted upwardly by the action of the spring-actuated pawl 81 on the pivot arm 86, and the shaft 87 rotates at the same time to allow the return movement of the rail 113 by the tension of the spring 121 α (FIG. 12) . Immediately before the key lever leaves the vertical grooves 35 and 57, the rail 113 pivots the lever 115 to close the contact 112 to excite the solenoid 108 to retract the hammer 5 into its cocked position. When the rail 113 moves backwards, the rod 110 also moves backwards under the action of the spring 121 (FIG. 8) until a lug 122 on the head of the bolt 109 touches the toggle lever 107 in its upper position. When the solenoid is excited, the toggle lever is pivoted counterclockwise and pushes the bolt 109 forward until the toggle lever is locked by the bolt under the action of the spring 121. During its downward movement, the toggle lever grasps the rail 113 and brings it into the starting position under the lever 115 so that the contact 118 can open again.

When the key lever 33 moves up from the vertical grooves 35 and 57 (Fig. 6), are the control rails 29, 30, 53, 54 returned to their central position by the action of the springs 58. As a result, the type cylinder 4 is returned to its basic position without dirtying the writing surface, since the print hammer 5 is already withdrawn. By pivoting the Bracket 88 is also the pawl 82 released from the ratchet 78, so that this is in the opposite direction clockwise (Fig. 6) rotates until the pawl 81 stops moving. The discs 24 and 59 rotate with the ratchet wheel and operate the ropes 12 and 60, respectively, around the type cylinder and the hammer to bring into the new printing position.

Another feature of the invention is interchangeability of the type cylinder 4. According to FIG. 9, the. Shaft 10 has a sliding type cylinder carrier 38, onto which a prismatic type cylinder 4 with a recess 125 is pushed can be.

For this purpose, the type cylinder carrier 38 has a wedge-like projection 124 and on one side a stop disk 39 and a thread 128 on the other side. The jacket-shaped type cylinder is attached to the type cylinder carrier 38 with a

knurled nut 127 screwed tight. The stop washer 39 and the knurled nut 127 are with Grooves 130 and 131 are provided in which the forked ends 129 of the bearing 9 engage. Through this simple Arrangement, the bearing 9 can be withdrawn from the shaft 10 when the rope 12 has been loosened (Fig. 9). After unscrewing the nut 127, the prismatic type cylinder 4 can be turned to the right subtracted from.

1, 10 and 13 show a mechanical device for resetting the type cylinder and the Print hammer after a line has been labeled. With the help of an arm 132, which consists of a Protruding slot on the front of the machine, the type cylinder and print hammer are in the left margin position of each print line returned. A third drive pulley 133 of the same diameter as pulleys 24 and 59 is axially thereon attached. ■ runs around the drive pulley 133 a rope 134 which is attached to the anchor bolt 135 (FIG. 10) of the disc 133. The rope 134 is over pulleys 136, 137 guided from the drive pulley 133 to the end points 138, 139 on the handle 136 in order to to move this with the rope 134 with the step-by-step movement of the type cylinder to the right. at Returning the handle 132 by hand to the left (FIG. 10) will drive pulleys 133, 24 and 59 rotated clockwise, whereby the spiral spring 94 is tensioned and thus also the type cylinder and the print hammer can be brought to the left edge position.

The ribbon 8 (Fig. 5) is between a supply spool 140 (Fig. 10, 12, 13) on one side of the Machine and a winding spool 141 on the other side of the machine so that a section of the ribbon between these two spools rests in guides so that the ribbon between the Writing paper 7 and the type cylinder 4 lies. The ribbon 8 remains during the movement of the type cylinder and the print hammer stand. However, when the type cylinder 4 and of the print hammer 5 to the left edge is wound onto the spool 141, while a new ribbon section passes between the coils 140, 141. For this purpose, the take-up reel 141 is through the Shaft 142 connected to an overrunning clutch 143. This in turn is driven by the ratchet wheel 78. By moving the ratchet 78 counterclockwise (Fig. 10), through which the type cylinder 4 and the print hammer 5 move from left to right across the paper, the take-up reel 141 not rotated, but only when resetting type cylinder 4 and the printing hammer 5, when the direction of rotation of the ratchet 78 is reversed.

According to Fig. 10, 12 and 13, the empty step mechanism comprises a space bar 145, a toggle lever 146, which at an actuation of the space bar is pivoted clockwise (Fig. 13) and a push rod 147, which is connected to the toggle lever 146 in order to actuate the stepping mechanism 77. The space bar 145 is connected to the shaft 148 by the arms 149. The shaft 148 is rotatably mounted in bearings 150 and carries the toggle lever 146. The push rod 147 is rotatably connected to the toggle lever 146 at 151 guided below the control rails 30, 54, 29 and 53 and works with the angled stop of the lever arm of the pawl 81 together. A spring 152 holds the push rod 147 via the toggle lever usually in the withdrawn position.

By pressing the space bar 145, the shaft 148 and the toggle lever 146 are rotated, the push rod 147 pushed back against the stop 83 and pivoted the pawl 81 counterclockwise. This movement actuates the stepping mechanism 77 in the manner described above in order to move the type cylinder 4 and to move the print hammer 5 step by step in the line direction.

It has already been explained that the writing paper 7 between the print hammer during the writing process 5 and the type cylinder 4 is held. By a known paper guide, which in the consists essentially of a slide 153 (FIG. 5), the writing paper 7 is placed between the type cylinder 4 and print hammer 5 brought. The slideway 153 comprises two guide plates 154, 155, which in a little Distance from one another from the opening 156 to the curve 157 close to the two transport rollers 158, 159 lead. Shortly before these, the sheets 154, 155 are attached to transverse rods 160 and 161, respectively. The transport rollers 158, 159 convey the writing sheet 7 up to the writing position between the type cylinder 4 and the print hammer 5. The transport roller 158 is by an outside of the machine frame attached rotary head 170 (Fig. 1) rotated by hand.

Furthermore, a device is provided which brings the type cylinder 4 into an exact line position. A star wheel 162 (FIGS. 8 and 12), which has as many pointed teeth as the type cylinder, is used for this purpose Has surfaces. The angled end of a pin 164 engages in the teeth of the star wheel Alignment lever 163, which is actuated by an intermediate lever 165 mounted on the pin 166 will. With a forward movement of the rail 113, the intermediate lever 165 is due to the angle attachment 167 is pivoted clockwise (Fig. 8), whereby the alignment lever into the teeth of the star wheel 162 intervenes. Minor inaccuracies in the setting of the type cylinder are compensated for in this way.

Claims (1)

Patent claims: l.Type cylinder printing unit for typewriters, in particular small typewriters, with a when the key is actuated by drive cables which are guided over pulleys and which are longitudinally displaceable and rotatable type cylinder and line-wise adjustable recording medium, characterized in that that when a key (2) is struck, the associated key lever (33) control rails (29, 30, 53, 54) with rope pulleys (21, 28; 22, 27; 50, 51; 49, 52) arranged on them in known Way shifts and thereby by means of these and firmly arranged pulleys (13 to 15, 17 to 19, 23, 26, 44 to 48) guided cables (12, 43) opposite the type cylinder (4) in the printing position the known print hammer (5) brings the electromagnetically driven print hammer (5) is triggered via a lever and the type cylinder (4) is activated via a stepping mechanism (77, 78) and the print hammer (5) is adjusted by one switching step in the writing direction. 2. Apparatus according to claim 1, characterized in that that of a pawl system (81, 82, 83, 86) formed key-controlled stepping mechanism (77, 78) for the step-by-step Displacement of the printing unit (4, 5) with the ratchet wheel (78) and driven by spring force (94) "- _ ■ 909 558/10 the pulleys (24, 59) for the various cables (12, 60) works together. 3. Device according to claims 1 and 2, characterized in that the return of the type cylinder (4) and the printing hammer (5) in the line start position and the ribbon transport over an entire line length through the on the spring-loaded pulleys (24, 59, 133) connected cables (12, 60, 134) is carried out. ίο 4. Apparatus according to claim 1, characterized in that the exact line setting of the prismatic, replaceable type cylinder (4) is monitored by a star wheel (162). 5. Apparatus according to claim 1, characterized in that the triggering behind the Recording medium (7) under the tension of a spring (97), which is under the tension of a pressure hammer (5), when a key is pressed, an angle lever (107) connected to a solenoid (108 ) is released and the solenoid (108) is excited and the angle lever (107) is pivoted back. and thereby brings about the return of the print hammer (5) into its tensioned position. Considered publications:
German patent specifications No. 181 189, 288 930, 451860, 898 304; Swiss Patent No. 32,988; British Patent No. 7105 dated 1903. In addition 3 sheets of drawings ■ 909 558/10 6.59