DE1195528B - Line printer that can be triggered by pulses - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

G06k

German class: 43 a - 41/03

Number: 1195 528

File number: S 65963IX c / 43 a

Filing date: November 25, 1959

Opening day: June 24, 1965

Z * Z

The invention relates to line printers which can be triggered by pulses and which supply the printing force and determining the exact time of printing, in a constant relationship with the Type carrier permanently moving drive means, as desired in particular for data processing devices are. With the help of such a line printer it should be possible to print ten lines with z. B. to accomplish seventy characters per second.

It is already known to carry out the so-called flying print for such purposes, i. H. for example to use a print hammer that can be controlled according to a time code and with a continuously rotating type carrier, for example a type wheel, cooperates. For line printers, a number of type wheels for a type roller corresponding to the number of possible characters per line united.

It is also known that the imprint energy and the very precise imprint time within the for the time available for the character selected with the means mentioned moved by one with the type carrier in a constant ratio, e.g. as a disk with radial striker pins to derive trained organ. One known high-speed printer of this type is electrodynamic controllable. The mechanical triggering impulse comes from the movement of one in the magnetic field of a permanent magnet lying conductor when an electrical pulse is applied.

However, printers of the last-mentioned type have the disadvantage that they use high currents for triggering claim. In particular, however, there is a risk with all of the printers mentioned that if they are not in time Return of the mechanical impulse transmission member from the area of the pressure member or an associated intermediate link, bouncing blows and false impressions occur.

In the case of line printers that can be used in particular for data processing devices Kind, each pressure point with a single to connect the drive means with the corresponding Equipped with a pressure hammer and a coupling element that can be engaged by means of a trigger pulse generator there is a desire to be able to use simple pulse generators, e.g. electromagnets, to which no extremely high requirements with regard to the reset time corresponding to the high printing speed, z. B. Fall time of the electromagnets need to be placed. This is done according to the invention in such a way that the decoupling of this line printer which can be triggered by pulses

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,

Munich 2, Witteisbacherplatz 2

Named as inventor:
Dipl.-Ing. Erich Eißfeldt, Munich;
Dipl.-Ing. Fritz Reinecke, Kiel;
Fritz Schulze,
Hermann Kuchenbecker,
Gerhard Teichmann, Munich

Coupling link from the trigger pulse generator unaffected by its current position by the action of the drive means happens.

The decoupling takes place in contrast to known, controlled in the manner mentioned above Printers not under load. The wear of the parts is thereby kept within tolerable limits, and the energy to be used for printing only needs to be small. Furthermore, it is easily possible to use the masses to keep the controlling members very small, which in turn increases the working speed relieved. In addition, it is particularly when the pressure element returns to its starting position before the end of the period corresponding to the pulse raster frequency or returns in their vicinity, the pressure organ is even less prevented from doing this than at known printers.

According to a further development of the invention, the print hammer touches down during its forward movement the recording medium continues the decoupling effect of the drive means by means of its projection.

According to another development of the invention, the coupling element is decoupled below initial maintenance of the operative connection between the drive means and the print hammer.

A particularly favorable embodiment of the invention results from the fact that the decoupling of the coupling member from the drive means by one upon engagement of the coupling member in a known per se Way tensioned spring is supported. It is useful to use the one at the beginning of the printing process tiltable coupling member engaging spring provided so that this at the same time to tilt the coupling link back into the rest position

509 597/216

and removing this member from the range of motion of the drive means is used.

For example, with the help of known coincidence circuits, the impact of the from the drive means, e.g. B. a cam or pin washer, to be influenced coupling member on the front avoided a cam or pusher pin.

In the case of electromagnetically triggered printers with longitudinally movable print hammers, this is preferably used a pull or push wire as a magnet anchor approach. An additional resilient transmission and Deflecting member also act as an armature return spring.

Other developments of the invention emerge from further subclaims.

Three exemplary embodiments of the invention are described below and illustrated in the drawings. It shows

Fig. 1 is a schematic diagram of a printer with an intermediate member between electromagnetic armature and pressure hammer,

Fig. 2 is a view of a differently constructed printer of this type,

FIG. 3 shows an embodiment of a line printer with printing systems similar to FIG. 2.

The printing systems explained in the following are by means of simple electromagnets that do not operate special measures have been set up for quick response and exceptionally quick dropping out need to be triggerable. This makes it possible to achieve a good level of efficiency for the electromagnets. Her Electromagnetic armatures are spring-tied to the dropped position. In the systems shown, the The magnet armature has only reached its rest position shortly before reaching the next possible trip.

The printing systems shown are structured as follows: That as a writing pad serving paper sheet 1 is, if necessary with the interposition of a non-drawn ribbon, between a type wheel 2 and a print hammer; this only triggers the movable one Print hammer electromagnetically, while its kinetic energy from a particular as rotatable Cam or pin disc trained drive means is derived. The movement of this Organs is in such a constant relationship to that of the type wheel that in each case the Print hammer can only press the paper against the type wheel if a type is accurate facing. For example, when using a cam or pin disc with twelve cam or The cam or pin washer becomes the cam or pin washer on the circumference and a type wheel with sixty types Driven at five times the speed of the type wheel, taking into account the print hammer movement time in a precisely chosen phase relationship that is related to the Type wheel speed does not change proportionally, because then in particular the deceleration during free flight of the print hammer will be of different sizes after leaving the drive means.

When training according to the principle diagram F i g. 1, only the push pin 5 a is shown on the pin washer 5. It is assumed that the print hammer 13 is guided by jaws 12 so that it can only perform longitudinal movements from bottom to top and vice versa. The electromagnetic armature 14 is movably connected to an arm 14 ″ which carries a nose 14 b. In the position shown, this arm is latched via the nose 14 b with a longitudinally displaceable intermediate member 16, which is spring-bound by a spring 15 to the left end position, by means of a counter nose 16 a.

The mode of operation of this embodiment is as follows: As soon as the electromagnet 18 is excited, the armature arm 14 α pushes the intermediate member 16 to the right. This member arrives in this way in the range of motion of the pin 5 a of the pin washer 5. Swiveling the intermediate member 16 around its bearing point 17 and the armature arm 14 a around its pivot point 14 c on the armature 14, the pressure hammer 13 is pushed upwards. About his approach

13 a he takes the free end of the anchor arm

14 a with and uncoupled the noses 146, 16 a. The spring 15 can now pull the intermediate member 16 back into its drawn starting position which is determined by a stop which is not shown for the sake of clarity. As soon as the print hammer and the armature 14, which is tied to its lifted position by a spring 19, have reached their rest position again, the lugs 14 b and 16 a can latch again.

Fig. 2 shows a printer in side view with the trip solenoid omitted. The print hammer 43 is guided in a longitudinally movable manner by a component 41 and is tied to the rest position by a spring 48. It rests on a particularly horizontally movable but also tiltable coupling member 45, which in turn rests with its part located below the print hammer 43 and adjacent to the free end 45 a on a projection 46 a of a guide component 46. With its left end, this intermediate link is only guided laterally. It has, in the left third of its total extent of a downwardly projecting extension 45 b and is so to an edge 46b of the guide member against the force of a force acting on the lug 45 spring 49 pivot. A wire-shaped electromagnet armature attachment 44 is longitudinally displaceable to the right when the release magnet is excited. It carries a buffer 44 a at the right end and is also guided through the component 46. A pin washer 42 is provided as a clock-generating drive means.

The mode of operation of this printer is as follows: When the wire-shaped anchor attachment 44 and thus the coupling element 45 are triggered to the right, this coupling element comes into the range of motion of the pin washer 42 and is pivoted around the edge 46 & counterclockwise with a sudden upward movement of the print hammer 43. The parts 45 and 44 a are decoupled from each other; the spring 49 can then press the projection 45 b against the edge 460, so that the coupling member 45 finally assumes the position shown in dashed lines. When the print hammer is moved downwards again after the print as a result of its gravitational force, supported by the spring 48, it strikes the coupling element and pivots it back into the initial position shown, unless it has already been done under the action of the spring 49. If at this point in time the anchor extension 44 has not yet been withdrawn into the initial position shown, the buffer 44 a is pressed slightly upwards against the force of the spring 47 and its outermost end rests on the left end of the coupling member 45.

As soon as the electromagnetic armature has fallen off again and thus the armature attachment 44 is withdrawn to the left is, the spring 47 also returns the buffer 44 a to the standby position shown.

3 shows part of a line printer in which the six electromagnetic systems 50, 56, 57, 58, 59, 60 of six individual printers of the line printer lying next to one another at a character spacing of one line are attached in two rows to a common holding plate. Apart from minor structural changes, the components 41, 42, 43, 45, 46, 48 and 49 of FIG. 2 can easily be recognized from this figure. The wire-shaped armature attachment 44 of the foremost individual printer, which is controllable by the electromagnet 50 and is articulated to the magnet armature 40 and which is guided in part 46 c of the guide component 46 so that it can be longitudinally displaced, now no longer engages directly on the tiltable coupling element 45, but on one that can be pivoted about a bolt 51 Lever 52 which, together with a J-shaped curved leaf spring 53, forms a transmission and deflection element between the components 44 and 45. The leaf spring 53 is pretensioned in such a way that it rests with its free end on a bolt 54 with a force fit. The edge 46 & of FIG. 2 is replaced by a further bolt 55, the bolts 51, 54 and 55 running parallel and being fastened in a thin plate 46 d which extends perpendicularly thereto and which belongs to the guide component 46. The spring 47 of the previous exemplary embodiment according to FIG. 2 is replaced by the leaf spring 53. Six adjacent wire-shaped anchor attachments, which serve to trigger six adjacent individual printers belonging to adjacent printing positions of the line printer, are combined in the manner explained above with their lengths staggered. The leaf spring 53 serves at the same time as an armature return spring. Due to its shape and bias, a straight movement of the free end of this spring acting on the coupling member 45 is guaranteed. To make the type roller composed of many individual type wheels 2 easier to see, the sheet of paper between the print hammer head and the type roller has been omitted in this figure. It can be funded gradually from bottom to top.

Embodiments are within the scope of the invention possible, which differ in many ways from the exemplary embodiments. So can on Place of the cam or pin discs. ^ Other drive means be used, e.g. B. those that consist of reciprocating shock members. For reasons the advantageous accommodation of the printing systems proves that shown in the embodiments radial movement of the organ cooperating with the cam or pin disk, however as particularly useful.

Claims (10)

Patent claims: 1. Line printer that can be triggered by pulses with a drive means that delivers the pressure force and determines the exact time of printing, is constantly moving in a constant relationship with the type carrier and, for each printing point, a single coupling element which is used to connect the drive means to the corresponding print hammer and can be engaged by means of a trigger pulse generator, characterized that the decoupling of the coupling member (16; 45) from the trigger pulse generator (14, 14 ″, 14 b; 44) takes place unaffected by its current position by the action of the drive means (5; 42). 2. Printer according to claim 1, characterized in that the print hammer (13) continues the decoupling effect of the drive means (5) during its movement towards the recording medium by means of its projection (13 a). 3. Electromagnetically triggerable printer according to claim 2, characterized in that a shoulder (14 b) of the magnet armature (14, 14 a) at the end of the armature stroke is in positive connection with the coupling member (16), which is spring-loaded in the decoupling sense, and that the armature shoulder ( 14 b) and the coupling member (16) are decoupled from the print hammer (13) on the way there in the direction of the substrate to be inscribed. 4. Printer according to claim 1, characterized in that the decoupling of the coupling member (45) while initially maintaining the operative connection between the drive means (42) and the print hammer (43) happens. 5. Printer according to claim 1, characterized in that the decoupling of the coupling member (45) of the drive means of a known per se upon engagement of the coupling member Way tensioned spring (49) is supported. 6. Printer according to claim 5, characterized in that the at the initiation of the Printing operation tiltable coupling element (45) attacking Spring (49) is provided so that it is at the same time to tilt back the coupling member in the Rest position and removal of this member from the range of motion of the drive means (42) is used. 7. Electromagnetically triggerable printer according to one of claims 1 to 6 with longitudinally movable Pressure hammers, characterized by a pulling or pushing wire (44) as a magnet armature attachment. 8. Printer according to claim 4, characterized by a resilient transmission and deflection element (52/53) between the element (44) and directly controlled by the trigger pulse generator with the longitudinal movement of this member a longitudinal movement offset by about 90 ° in the Triggering performing coupling link (45). 9. Printer according to claim 8, characterized in that the transmission and deflection element (52/53) is pretensioned so that after the return of the element controlled by the pulse generator (44) and the coupling member (45) in the starting position automatically in the standby position falls behind. 10. Electromagnetically controllable printer according to claim 8, characterized in that the transmission and deflection element (52/53) is also effective as an armature return spring. Considered publications:
German Patent No. 746411;
German interpretative document No. 1055 047;
U.S. Patent No. 2,766,686. 1 sheet of drawings 509 597/216 6.65 © Bundesdruckerei Berlin