DE1275577B - Setting device for the axially and rotationally adjustable type carrier of key and / or memory-controlled printing units - Google Patents

Description

Adjustment device for the axially and in the direction of rotation adjustable Type carrier of key-controlled and / or memory-controlled printing units The invention relates to an adjustment device for a type carrier, which can be adjusted axially and in the direction of rotation is and is used in printing units, either via keys or from a memory being controlled. Printing units with a single type carrier, which is on its scope all required types have, compared to the conventional type lever printing units various advantages, for example a higher working speed and the Possibility of exchanging the type carrier in a few simple steps. Type carrier of cylindrical shape have compared to comparable type carrier designs, z. B. in wheel or spherical shape, the advantage that their outer surface has a larger number Types can accommodate, which is very desirable for certain purposes. Also is setting a cylindrical type carrier is easier than, say, a spherical one Type carrier, because it is rotated and axially displaced into the printing position of a Character can be moved. The generation of a linear and a rotary movement for the type carrier setting namely requires a relatively low technical Expenditure.

An essential part of a printing unit with such a single one Type carrier is the setting device, with the help of which the type carrier before the actual imprint is to be set in its printing position, so that the selected character comes to lie directly in front of the print point. In such a setting device, the information representing the sign, when entering punched tape or when entering a key, generally in the form of a Binary code are supplied, namely by a certain pulse combination or a combination of several mechanical elements, in analog setting values for the type carrier can be converted. These are determined by a certain linear adjustment path shown for the axial adjustment of the type carrier if it is a cylindrical one Type head acts, and a certain angle through a rotary adjustment path. Appropriate Both adjustment movements run simultaneously in order to achieve the shortest possible adjustment time to reach.

Adjustment devices of this type are known in large numbers. In the U.S. Patent 2,218,113, for example, is a type head adjuster described, in which several cam disks connected in series with a certain stroke are and by combining certain cams different output adjustment paths for the various settings of the type head. Furthermore is a type cylinder setting device is known from the United States patent specification 2 769 029, in the case of the axial and rotary adjustment of the type cylinder, which is constantly on The cams located on the driven shaft can optionally be switched on. The setting of any element with the help of face cam disks, which can be selected individually or in combination are switched on electromagnetically and their axial stroke increases is added to an output result value is finally disclosed by U.S. Patent 3,057,210 became known.

The invention aims to improve the known adjusting devices and is particularly applicable for printing units with a cylindrical type carrier, which have an increased number of characters. The requirements for an adjustment device, which should work quickly, reliably and precisely even over long periods of operation, is easy to manufacture and takes up little space, the larger, the higher the . In other words, the greater the number, the greater the number of possible settings the various letters, numbers and symbols that are arranged on the type carrier are. With the growing importance of data transmission and processing and the desired increase in the number of special characters available and symbols in addition to letters and numbers, the so-called ASCII code, also known as X3-4 code, enforced, which provides seven channels, so for each character seven bits, and thus 128 characters can be represented without that a shift code is used, as is the case with the common telex codes and is used in typewriter-controlled printing units. With the said Code is therefore every character, i.e. capital and small letters, numbers and symbols, fully determined by a 7-bit combination. The need to transfer a special shift code is not applicable.

The adjustment device according to the invention is constructed so that for Generation of proportional to the adjustment paths, via parallelogram arrangements to the type carrier transferable linear movements each a number of the axial and the Rotary adjustment of the type carrier assigned axial cam disk pairs on one common axis are arranged, each consisting of one on the axis only longitudinally displaceable Follower cam disk and one each rotatable and longitudinally displaceable on the axis, by means of an assigned control unit can be optionally connected via a spur gear drive Form cam disc.

The setting device switched in this way enables the incoming To feed code pulses directly to the individual control units, so that a direct Conversion of the coded information into that required for the type carrier setting Adjustment movements takes place. This adjustment device according to the invention enables a very compact design and has the particular advantage that all are moving Parts are in constant contact with each other, any bumps and collisions mechanical parts are therefore prevented.

Preferably the control units according to the invention are on one common, constantly rotating shaft arranged. This is an additional Simplification of the structure of the device according to the invention given. The control units are electromagnetically actuated and can according to further advantageous measures be designed either as single-turn clutches or half-turn clutches; in the latter case, its electromagnet is linked to a second, in which the operative one Position of the cam disk corresponding to the 180 ° position of the half-turn clutch disk can be switched on by means of a switch which can be actuated by the clutch disc, the Effect of the winding-canceling second winding provided, in such a way that in the case of a control unit successively supplied identical control signals The coupling remains locked in its 180 ° position. With the help of this embodiment it is possible to return the type carrier to its basic position from a Position to be set immediately in the next printing position. Of course this is Measure of great influence on the achievable working speed.

With the graduation of the strokes of the individual shaped cam disks according to a binary series of numbers, the first shaped cam disk corresponds to the value " I", the second to the value "2" and the third to the value "4" in the selector for the axial adjustment of the type cylinder. The same applies to the selection device for the rotary adjustment of the type cylinder, only that a fourth pair of cams must be provided, which corresponds to the value "8", which results in a total of sixteen possible angular positions of the type cylinder. It has proven to be useful to arrange two pairs of cam disks instead of a shaped cam disk corresponding to the stroke value "8" and to assign them to a single control unit, each of which is switched on at the same time and whose stroke corresponds to the value "4" so that the effective stroke corresponds to the value " 8 «corresponds to.

The invention is illustrated below with reference to the drawing in an exemplary embodiment explained in more detail. It shows F i g. 1 shows a type printing device in a diagrammatic representation with a cylindrical type head and the associated adjustment device, FIG. 2 one of the cam disk pairs with the associated control unit of the in FIG. 1 shown Device in an enlarged view, FIG. 3 a keypad to control the Adjusting device according to FIG. 1, Fig. 4 a circuit diagram for the control the adjustment device according to FIG. 1 by the device shown in FIG. 3 buttons shown or by a perforated tape reader and F i g. 5 a special circuit arrangement for a control unit equipped with a half-turn clutch for setting the Type carrier immediately to its next printing position without previous reset in its basic position.

F i g. 1 shows a type printing device T with a cylindrical type head 10 which can be displaced along an axis 11 by the row spacings 12 of the characters via a tape roll 13 and rotatable about the axis 11 along a ring axis 14 using a further tape roll 15. The type head 10 is in the device according to FIG. 1 arranged stationary, while the platen 16 is assumed to be longitudinally movable.

The tape roll 13, by means of which the vertical adjustment of the type head 10 is carried out, receives its adjustment movements by means of a parallelogram arrangement 20 with two levers 21 which are pivotably mounted about axes 22 and over whose tape rolls 23 a tape 24 forming a closed loop is guided. The tape 24 is looped once around the tape roll 13, so that a pivoting movement of the lever 21 is transmitted to the tape roll 13 via the tape 24. The levers 21 are connected by means of a rod 25 so that they can only perform the same pivoting movements. The rod 25 is provided with locking grooves 26 which mark each of the possible adjustment positions of the rod 25. A cam-operated locking tooth 27 arrives after each setting act of the device to engage in one of the locking grooves 26, the parallelogram arrangement 20 being aligned and locked in the exact character imprint position.

The tape roll 15 is basically made by means of a parallelogram arrangement 30 driven by the same structure. In this way, the tape rolls 13 and 15 the type head in each case by superimposed adjustment movements in the desired printing position set; the subsequent push-off movement of the Type head 10 takes place by common means that are not shown.

The parallelogram arrangements 20 and 30, via which the type head 10 is set in its respective printing position, are actuated by selection devices 40 and 50, by means of whose linear movements of different sizes are generated and transmitted via slide bushings 28 and 31 to the parallelogram arrangements 20 and 30. The selection device includes three pairs of cams 41, each of which, as shown in FIG. 2 shows, is composed of a shaped cam disk 42 and a follower cam disk 43, which are mounted on an axis 44 with a central axis 45. The shaped cam disk 42 is rotatable about the axis 44 and axially displaceable on it, while the follow-up cam disk 43 cannot be rotated relative to the axis 44 by means of a groove 45a, but only longitudinally displaceable. The sequence cam disk 43 of the cam disk pair 41 of the selection device 40 located furthest to the left (FIG. 1) is fixedly attached to a frame plate 46.

On the cam surface of the shaped cam disk 42 there is an elevation 47a and a depression 47b, which are arranged at a certain angle α to one another and are connected by continuous linear transitions 47c. The axial stroke between the elevation 47a and the recess 47b has a certain size for the row spacing of the types on the type head 10 and is graduated from cam disk pair to cam disk pair, for example according to a binary series of numbers. For example, the distance d of a pair of cam disks 41 corresponds to the row distance 12 of the type rows on the type head 10, for the next pair of cam disks 41 it corresponds to unit 12 twice and for another pair of cams 41 to four row distances. On the cam surface 48 of the following cam disk 43 of each pair of cam disks 41 there is a cam lug 48 a, the effective stroke 48 b of which is greater in the axial direction than the respective distance d of the associated shaped cam disk.

The shaped cam disks 42 can optionally be switched on by individual control units 60 assigned to them, which are connected to them via toothed rollers 61 and grooves 62. The length of the toothed rollers 61 is such that the engagement of the associated pinion is maintained in every position of the axially adjustable form cam disk 42. The slots] 42 are arranged on a common, continuously rotating shaft 63 which is continuously driven by a motor (not shown) via a belt pulley 64. Each pinion 62 is assigned a single-turn clutch, consisting of a pawl 65 and a ratchet wheel 66, which are normally held out of engagement by means of a bolt 67 controllable by an electromagnet 68. Ritze] 62 and toothed roller 61 each have the same number of teeth, so that each time one of the electromagnets 68 is actuated, a full rotation of the corresponding shaped cam disk 42 is triggered.

The selection device 40 contains a total of three pairs of cam disks 41 with the associated control units 60, so that the type head 10 can thus optionally be adjusted by zero to seven row spacings in the axial direction. The setting movement of the type head 10 in the direction of rotation is achieved in a corresponding manner via the selection device 50, which according to FIG. 1 has a total of four control units 60 with the associated toothed rollers and pinions. However, one of the four toothed rollers is assigned two pairs of cam disks 51 which act in opposite directions and whose shaped cam disks 52 have a stroke d of four adjustment units each, so that when the two pairs of cam disks are connected at the same time, the associated control unit 60 generates an adjustment path of eight units. The remaining pairs of cams each have a control unit 60 , as in the selection device 40. The selection device 50 can thus optionally generate a linear displacement of zero to fifteen units, corresponding to the adjustment of the type head 10 in any of a total of sixteen character columns.

In the case of the one shown in FIG. 3, a pin 72 is actuated by pressing a key 71 in that it is released from a tooth 73 and then moves downward under the action of a tension spring 74 and penetrates through a number of control rails 75 lying one on top of the other. At the same time, the pin 72 also strikes a bracket 81 and pivots it clockwise, as a result of which a switch 78 is closed. The bracket 81 also actuates the locking pawl 83 to release a spring-loaded arm 84, which now moves to the left (FIG. 3) and releases the control rails 75. These can now move from their initial position under the influence of springs 76 to the left in their effective position. The coding in the control rails 75 consists of long and short recesses 77 which interact with the selected pin 72 in such a way that only certain selected control slides 75 can move to the left. The character struck by the key is represented by these selected control rails 75.

The spring-loaded arm 84 and the bracket 81 are reset by means of electromagnets 85 and 86, whereupon another button can be pressed. The control rails 75 selected and shifted to the left close switches 78, which are individually assigned to them, in a corresponding combination. As in the following in connection with FIG. 4, by closing these switches 78, the control units 60 (FIGS. 1 and 2) assigned to them are activated, whereby a working cycle of the assigned pairs of cam disks and a stopping process are triggered.

The in Fig. 3 key mechanism K shown has a special feature on, as the package control rails 75 from three groups of control rails 91, 92 and 93 exists, the optional activation of which for actuation of the switch 78 by Shift keys 94, 95 and 96 is controlled. The control rails of each group 91, 92 and 93 are coded differently so that each time a key is pressed 71 optionally one of three different codes becomes effective. That way is it possible with the usual number of keys 71, namely between forty and forty-five keys to choose from a very large number of characters.

The switchover selector device consists of three switchover keys 94, 95 and 96 which, when actuated, push an associated selection finger 94a, 95a or 96a into associated coded recesses 97, whereby one of the control rail groups 91, 92 and 93 is released while the other both are locked. Latches 94 b, 95 b and 96 b cooperate with lugs 94 c, 95 c and 96 c in such a way that an actuated shift key is held in its depressed position; the latches 94 b, 95 b and 96 b are connected to one another by means of a bracket 98, which ensures that, when actuated, one of the toggle keys, which previously locked in its actuated position, is released. So there can only be a single shift key in the depressed position at a time.

The keypad K is operated in such a way that first one of the toggle keys 94, 95 or 96 is pressed and thus one of the control rail groups 91, 92 and 93 is selected and released; then a button 71 is pressed, whereby, as described, certain control rails of the selected control rail group are released and the associated switches 78 close in a corresponding combination.

With the in FIG. 4, the selection devices according to FIG. 1 either from the keypad K according to FIG. 3 or can be controlled directly by a perforated tape reader R. It is shown there that the pinions 62 of the control devices 60 are actuated by associated electromagnets 68 and the magnets 68 are controlled by the switches 78 actuated by the control rails. The perforated tape reader R closes internal switches (not shown) when certain combinations of holes are sensed by the perforated tape. An electromagnet C controls the operation of the type printing device T in such a way that all the functions described in a cycle run in a time-controlled sequence. The actuation of the electromagnet C is controlled either by the switch 82 when the keypad K is actuated or directly by the perforated tape reader R as a function of a reading cycle of the reader. In the latter case, the keypad K for controlling the electromagnets 68 is rendered ineffective by a multiple switch R1 which, when controlled by the perforated tape reader R, is controlled by an electromagnet R. The impression circulation controlled by the solenoid C triggers a number of functions (not discussed here) and also drives cam operated switches 87 and 88 which reset the control rails 75 and stop the impression circulation by actuating the electromagnets 85 and 86.

As mentioned, the cracks 162 lead each time the associated One-turn clutch off one revolution, which causes the shaped cam disks assigned to them 42 or 52 rotate once, whereby the increase 47a becomes effective. At the so far The execution described here is the type head 10 again after each setting reset to a starting position.

F i g. 5 shows a modified control device 100 by means of which the type head 10 moves from a specific printing position directly to the next selected printing position without having to assume its basic position in between. A toothed roller 101 corresponds to the toothed roller 61 in FIG. 2 and is in engagement with a pinion 102 which, like the pinion 62 according to FIG. 2, has the same number of teeth as the toothed roller 101. Instead of the in FIG. 2, however, a half-turn clutch is assigned to the Ritze1102, consisting of a half-turn clutch disc 103, which is under the control of a spring-loaded bolt 104, which in turn can be actuated by an electromagnet 111. A pin 105 is attached to the pinion 102 and is either in the position shown or is displaced by 180 ° from this when the pinion 102 is rotated in steps of 180 °. If the pin 105 is located at 180 ° compared to that in FIG. 5, he closes a switch 112 to indicate that the pinion 102 is in the actuated position.

The electromagnet 111 consists of a core 113, a first winding 114 and a second winding 115. The two windings 114 and 115 are wound in opposite directions around the core 113, so that when they are excited they produce opposite polarity. The latch 104 is therefore actuated by simply switching on one of the two windings 114 or 115, while by simultaneously switching on both windings their magnetic effects cancel each other out and thus prevent the latch 114 from being actuated. Two cam switches 116 and 117 controlled by the print circulation determine the point during the cycle at which the control is actuated. Otherwise, the control takes place in accordance with the released control rails by the associated switches 78 (see FIG. 3).

In the following, the operation of the in F i g. 5 described circuit shown. If the parts are in the position shown, in which the arrow 106 on the toothed roller 101 points upwards, the first winding 114 is activated by closing the selected switch 78 as soon as the switch 116 is closed. The second winding 115 , however, is not excited because the switch 112 is open. The latch 104 is actuated under the control of the switch 116 and releases the pinion 102 for a half turn. Correspondingly, the toothed roller 101 executes half a revolution and brings the elevation of the shaped cam disk assigned to it into its effective position, the arrow 106 now pointing downwards. When the next character is selected, the switch 78 is now either closed or open, depending on the code of this character. Assuming that the switch 78 is closed, which in turn requires the effective position of the shaped cam disk associated with the toothed roller 101 (arrow 106 pointing downwards), the first winding 114 is excited as before when the switch 116 is closed. However, the pin 105 has the switch 112 closed, and the second winding 114 is also energized when the switch 117 closes, whereby, as explained, the magnetic flux of the electromagnet 111 is canceled. The bolt 104 is therefore not actuated and the pinion 101 remains in its operative position (arrow 106 pointing downwards).

If, however, it is assumed that the code corresponding to the second selected character does not require closing of the switch 78, the correct selection would require the return of the pinion 102 and the toothed roller 101 to the starting position (arrow 106 pointing upwards). In this case, since the switch 78 remains open, it will not excite the first winding 114 when the switch 116 is closed. On the other hand, the switch 112 closed by the pin 105 would excite the second winding 115 when the switches 116 and 117 are closed , whereby the bolt 114 is briefly actuated and thereby a rotation of the pinion through 180 ° into its starting position is permitted.

Claims (1)

Claims: 1. Adjustment device for the axially and in the direction of rotation adjustable type carrier of key and / or memory-controlled printing units with a plurality of series-connected, individually and in combination connectable cams of different strokes, characterized in that for generating proportional to the adjustment paths, via parallelogram arrangements (20, 30) to the type carrier (10) transferable linear movements each a number of the axial and the rotary adjustment of the type carrier (10) associated axial cam disk pairs (41, 51) are arranged on a common axis (44), each consisting of one on the axis (44) only longitudinally displaceable follower cam disk (43) and one each on the axis (44) rotatable and longitudinally displaceable, by means of an assigned control unit (60) via a spur gear drive (62,61) optionally connectable shaped cam disk (42, 52). 2. Apparatus according to claim 1, characterized in that the control units (60) are arranged on a common, continuously rotating shaft (63) and are designed as electromagnetically actuated single-turn clutches (65 to 68) . 3. Apparatus according to claim 1, characterized in that the control units (60) are arranged on a common, continuously rotating shaft (63) and are designed as electromagnetically actuated half-turn clutches (103, 104), the electromagnet (111) with a second, in the 180 ° position of the half-turn clutch disk (103 ), which corresponds to the effective position of the shaped cam disk (42, 52), can be switched on by means of a switch (112) that can be actuated by the half-turn clutch disk (103) and the effect of the winding (114) cancels the second winding (115) is in such a way that the half-turn clutch (103, 104) remains locked in the case of control signals supplied in succession to a control unit (60). 4. Apparatus according to claim 1, characterized in that the control unit (60) controlling the largest cam lift is assigned two pairs of cam disks (51) which can be connected simultaneously with the same lift. References considered: U.S. Patent Nos. 2,218,113, 2,769,029, 3057210.