DE2125066A1 - Printing device with helical printing roller and electronic control logic - Google Patents

Description

' concerning

Printing device with helical printing roller and electronic control logic

The invention relates to printers, in particular to a printer controllable by coded input signals, such as for example can be used to print out the output data on data processing equipment or computers.

For such printers, the use of a rotating, at least in the area of the lateral surface, a spiral or helically designed rod - hereinafter referred to as pressure helix or simply as helix - proposed, against which a hammer in the form of a

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a blade or a knife "or a striking leg strikes. Every time such a leg "is actuated, it strikes against the rotating pressure spiral and prints in the process one point. Are the flapping legs, knives or blades controlled so that they come to a specific, correctly chosen one When the time hits the rotating printing coil, the printed dots can be put together to form patterns that a desired information, for example alphanumeric characters, can be built up. These types of printers hereinafter referred to as spiral printer, was initially used for paksimile printing, while it was used for printing certain alphanumeric characters for the representation of coded input signals took place later.

Spiral printers are proportionate compared to other impact printers cheap and simple in construction, and multiple copies can be made with it. Although already suggestions exist to use a separate helix with a separate hammer for each seven or eight columns, is usually used for Printing an entire line or row uses a helix and hammer blade. However, for printing alphanumeric characters the hammer blade on a spiral printer must be able to display each character in about thirty-five To be able to hit punch positions in order to ensure a good representation of characters. Since it is very difficult to this day The required, very high impact speeds of the hammer can be achieved with conventional spiral printers only achieve very low line speeds.

The invention is based on the object of the line speed such a spiral printer by a new control logic and an improved hammer construction is very important to increase.

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The invention is "in a printing apparatus having a platen in the form of a helix "or with at least one on one Pressure roller body applied, helical pressure bar, with a drive device acting on the roller axis and with at least one hammer that is used to print a character against the rotating roller or against the Print bar suggests characterized by a device for generating a magnetic field, the one with a hammer Connected wire coil penetrates, which is suspended freely movable in the magnetic field so that a suitable excitation Movement of the coil takes place so that the associated hammer hits against the roller or against the pressure bar.

In the printing device according to the invention, as with conventional ones Printers of this type, such as the print roller with the helical print bar, i.e. the print coil, continuously rotated, and a hammer strikes this helix. Each helix with an associated hammer preferably spans a range of about eleven character positions along the print line, and the hammers are used to increase the Line printing speed operated in parallel.

The binary signals corresponding to an entire line of alphanumeric characters to be printed are stored in a register.

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chert. These characters are sequentially stored in read-only memory and then binary signals corresponding to dot patterns to be printed in a horizontal line are applied Read out shift registers in parallel, with one shift register each is provided for each hammer. The signals corresponding to the dot patterns are then registered from the shift registers pushed out to control the operation of the hammers, which then print the dot patterns along a single line for each revolution of the helix. The each line dot pattern corresponding signals are fed in parallel to the shift registers during the time during which the overlaps of the spiral elevations and the hammer shoulders are in the space between the individual letters. Through this no waiting time is lost to fill the shift register with the dot patterns.

Each hammer blade is lightweight with a wire winding firmly connected, which is arranged in a narrow, even magnetic air gap. The blade is made by one held stiff, lightweight frame, which can be swiveled over a small arc against the helix. The winding or coil, a hammer trigger pulse is applied, whereby the coil is moved a small distance in the magnetic field, whereby the hammer blade moves against the printing coil at high speed, so that a dot is printed with it.

Because of the extremely low inertia of the hammer system, the hammers can be operated at high speed, back to their original position returned and operated again, so that s s this reason the print is alphanumeric Can carry out characters at a much higher speed than was previously possible.

The invention and advantageous details are explained in more detail below using several examples with reference to drawings. E ₃ shows: _109850/1630

Pig. 1 shows the arrangement of a Pressure coil with hammers, as in an inventive Printer can find application;

Pig. 2 shows the side view of a hammer as can be used according to the invention;

Pig. 3 is a sectional view seen in the direction of the arrows on line '3-3 in Pig. 2 in connection with a sectional view of a pressure roller on which a corresponding helix is applied;

Pig. 4 in a block diagram a logic circuit arrangement for controlling the hammer actuation in an inventive Printer and

Pig. 5 illustrates details of the logic circuit according to Pig in a block diagram. 4th

Like Pig. 1 shows, in a printer according to the invention, a Pressure roller 11 is provided, which is kept at a constant high speed by a motor, not shown, while in Immediately mowing parallel to the axis of the roller, a number of pressure hammers 15 are arranged side by side. A ledge 13 is helically or helically applied to the cylindrical surface of the roller 11 so that each a hammer 15 is assigned a complete wrap around the roller. In a preferred embodiment of the invention painted over each hammer 15 eleven character positions along the print line. A 132-column printer has twelve print hammers. As every hammer When the roller 11 revolves a complete turn of the bar 13, the helical bar 13 stands in relation to it each hammer in the same dot pressure position. For example, if the bar 13 is in the third dot printing position Seen from the left edge of the leftmost hammer 15, it is also related to all of them remaining hammers in the third point position. To generate a series of electrical pulse signals that determine the angular position the pressure spiral can display a so-called tone wheel

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be provided on the roller 11. This allows the simultaneous Triggering the hammer to increase the line printing speed reach in an easier way.

Each of the hammers 15 has a hammer blade 17 which is arranged in such a way that the Elingenkante 10 strikes against the coiled strip 13 when the hammer is actuated. Each blade 17 spans only one turn of the coiled strip 13, so that upon actuation of a hammer which is bar 13 hinged at one point \.

Like Pig. 3 reveals, is between the hammer blade 17 and the roller is a paper web 19 and an ink or soleplate ribbon 20 arranged. Of course, other suitable means than the horizontal band 20 for printing a Point apply. So can, for example, pressure-sensitive Use paper or devices to apply ink directly to the filament. When a hammer is operated so the hammer blade 17 pivots against the coiled ledge 13 and it generally becomes a small, rectangular spot or point generated on the paper web 19, the area of which is determined by the area of intersection of the hammer blade 17 and ™ of the helical · strip 13.

The paper web 19 is continuously in the direction indicated by the arrow in 3 is transported further by means of a conventional paper feed device not shown here. The paper web can also be advanced intermittently, if desired, i.e. it becomes each one during printing horizontal line of data stopped. The ribbon 20 may be similar to a typewriter ribbon and is inserted between the Hammering and the paper web 20 is moved in a known manner in the direction perpendicular to the paper advance direction. The hammer 15 are operated at high impact speed to print dot patterns, with a "horizontal line."

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is printed so that lines of alphanumeric characters are printed out while the paper web 19 on the hammer blades passed by.

If the paper web continues to move evenly when the characters are printed, so the series of characters printed by each hammer would be easy with respect to the direction of paper advance inclined or inclined, if each hammer blade were precisely aligned with the axial plane of the roller 11- To this inclination of the printed To prevent characters and to ensure that the character lines are perpendicular to the direction of paper advance, For example, the plane of each hammer blade 17 can be slightly inclined with respect to the axis of the roller 11.

Each character position which is determined as the area on the paper web 19 in which an alphanumeric character is printed out is preferably made of five by seven (5x7) rectangular fields, i.e. made up of 35 point positions. Of course, if desired, character fields can also be made up of more or less than 35 points. Everyone the hammer 15 can be operated so that its blade 17 in any selected cough from point positions of each Character field strikes against the coiled strip 13, so that in this way any desired alphanumeric character can be built up in every character position.

The 3? Figures 2 and 3 show a hammer in more detail. The blade 17 is firmly connected to a lightweight, rigid frame 23. A pair of pins or tenons 25 holds the frame 23 in a U-shaped bracket 27, which has a pivoting movement the blade against the coiled strip 13 allows.

The blade 17 is glued to a thin, circular ring 31 by means of an epoxy resin, which in turn is connected to a coil 33 is made of fine wire glued to a cylindrical

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Bracket 34 is wound of light weight. the annular, serving as a hammer drive winding coil 33 is through, the frame 23 in an air gap 36 between a cylindrical core 35 and an annular pole piece 37 held. One pole of a permanent magnet 45 supports the core 35, while its other pole is magnetically connected to the pole piece 37 via the soft iron pieces 43 and 47. The core part 35 has a shaft 39 with reduced cross-section, which in an opening in a holding block 41 made of aluminum or a engages other suitable material of low magnetic permeability.

It should be noted that the pole piece 37 and core 39 and the parts 43 and 47 are made of material of high magnetic permeability, for example of soft iron. The individual parts can be precisely matched to one another, connected to one another in any known, suitable manner be, for example screwed to one another or glued to one another by means of an epoxy resin adhesive, towards which make sure that no air gap remains between the parts. The hammer 15 are - as indicated schematically - on one suitable base frame 51 placed. An elastic intermediate layer is preferably used between this frame and the hammers 52 introduced to prevent vibrations from being transmitted to the hammer. Appropriately, the U-shaped Bracket 27 screwed to pole piece 37.

The path of the magnetic flux runs from the right pole of the magnet 45 via the core 35 through the narrow, annular one Air gap 36, in which the coil 33 is arranged, to the pole piece 37 and then via the parts 47 and 43 back to the left Pole of the magnet 45 .. The pole piece 37 widens in the region of the shaft 39 of the core part 35, so that behind the annular air gap in which the coil-33 is arranged, a larger, annular air gap remains free, so that the

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lines of magnetic flux in the annular air gap 36 are concentrated and run through the winding 33.

In order to trigger the hammer and to strike the blade 17 against the helical strip 13, the winding 33 A hammer trigger pulse is supplied via the conductors 54. The polarity of the pulse is chosen so that that through the winding 33 flowing current creates a magnetic field that is related to the magnetic PeId in the annular air gap 36 reacts in such a way that the winding 33 is displaced outwards against the roller 11. Through this the blade 17 is also displaced against the coiled strip 13, the frame 23 being pivoted onto the pin 25. The duration of the excitation pulse is very short. The blade 17 strikes against the paper 19 and presses it against the bar 13, snaps back and hits against when moving back Pair of resilient stops 48 on. Advantageously, the blade 17 is made of a material of high permeability, so that the magnetic field in the air gap biases the hammer so that it rests against the stops 48.

Such a stop 48 is provided on each side of the frame 23 near the right and left ends of the blade to prevent the To keep the tendency of the hammer to vibrate as low as possible after the blow. Such vibrations can cause the The hammer again hits the paper web lightly, so that the well-known "ghost characters" are created. With certain patterns however, where the hammer hits a point in two consecutive ones If you want to print positions, the hammer need not return to the stops before the second trigger.

Since the blade 17 spans a number of character positions (e.g. eleven) it must be stiff along its entire length so that the "torsion period" is very short. Strikes the blade 17 in every position except the dead area against the helix 13,

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in this way a torsional moment is generated which triggers a brief torsional oscillation. TJm high quality and consistent To achieve the position of the printed dots along the length of the printing blade, the period of the torsional vibration, 'i.e. the short-term oscillation, kept as small as possible. This is achieved by having a stiffer, however lightweight frame 25 for holding the blade 17 and the "two shock absorbers located near the ends of the rods 48 are provided that absorb the torsional moment.

As the block diagram of FIG. 4 shows, the circuit structure for controlling the printer according to the invention made clear, the signals corresponding to the alphanumeric characters are received by a character recording memory 56 and saved. Each alphanumeric character is represented by a sequence of six binary signals known as one binary character are designated. Are the signals for an entire line of characters to be printed by the printer received, these signals are sent to the one-line buffer memory 53 transmitted and cached. In the preferred embodiment of the invention, there is one to printing character line of 132 characters, i.e. the one-line buffer memory 53 stores one hundred and thirty-two binary characters. To enable the printer to print out with spaces separated To enable alphanumeric characters, a binary character determines the space.

As can be seen from FIG. 4, two timing disks 55 and 57 are coupled to the roller 11. With each revolution of the roller 11 is a reset pulse from the disk 55 on reaching the starting position in which the coiled bar is shown in FIG Generated via a converter 59 which scans the timing disk 55. The timing disk 57, on the other hand, is generated when the roller rotates Pulses through a transducer 61. These pulses are with a

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Sequence of one pulse per horizontal point position generated in the drawing fields as soon as these point positions are in the assigned pressure position to get to the hammers 15. Pur the person skilled in the art it is apparent that instead of the disk 55 and of the converter 59, only a single clock disk can be used, "in which only to generate a reset pulse one tooth is missing.

As "already stated, a hammer spans eleven character positions, and each character field is five dot positions "wide. Each character field is from its adjacent character field Line offset by two point positions. Accordingly, spanned in the preferred embodiment as described herein becomes, each hammer 77 horizontal point positions, and the lactic disk 57 produces seventy-seven evenly spaced Pulses via the transducer 61 during each revolution of the roller 11. The pulses generated via the transducer 61 become one Series of five-bit shift registers 63, one being Slide register 63 is provided for each hammer 15. The impulses from the transducer 61 are only sent to the write register 63 in supplied to the period of time during which the intersection of the coiled strip 13 with the hammer blades 15 the point positions of the drawing field. The pulses generated in the transducer 61 when the overlap between the coiled bar 13 and the hammer blades 15 between the Character fields are not fed to the shift register 63, which is explained in more detail below with reference to FIG Fig. 5 will be explained. If the printer starts to print a new print line after a new one during operation Line of characters is stored in the buffer memory 53, the logic and control circuit 65 corresponds to the signals which correspond to the first or left-hand alphanumeric character to be printed by each hammer 15, a specific five-bit binary code being stored in each of the shift registers 63. As soon as the registers 63 the

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Receiving pulses from transducer 61 cause these pulses to occur a shift operation in the registers 63, so that a serial one Pulse is generated for every binary one stored in the shift registers. Every time a shift register 63 has one If a pulse is generated, it is sent to a corresponding Hammeri driver circuit 67, which in turn, in response to a received pulse of the coil of the associated hammer 15 a Trigger pulse supplies. As a result, the associated hammer 15 strikes in accordance with each of the shift registers generated output pulse against the coiled bar 13. The pulses generated by the transducer 61 are clocked in such a way that the associated hammer trigger pulses generated as a response variable then occur when the intersection between the coiled bar 13 and the hammer blades 17 through the top line of the point positions of the first or whole the character field on the left that is to be printed on by each hammer. This way it becomes the top one horizontal row of dots printed in the first or left-hand character field in association with each hammer. The logic and Control circuit 65, which responds to the corresponding binary characters that are in the buffer memory 53, stores the correct binary codes into the shift register 63 so that the correct character pattern of horizontal dots through each Hammer 15 is printed. In this way, the binary codes stored in the registers 63 give the dot patterns in FIG a horizontal line of the alphanumeric character field, where each binary 1 is a point and each binary 0 is a represent non-existent point, i.e. a free character field.

During the intersection of the coiled bar and the hammer blade the two point positions between the first or the character field on the left and the second, through.-each Hammer passes through the character field to be printed, fills the logic

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and control circuit 65 of each five-bit shift register 63 again with five-bit binary signals on top of that Row of dots corresponds to the second character to be printed by the associated hammer. Once the overlap between the coiled strip and the hammer blade is the dot printing position of the top row of dots in the drawing area passes through in the area of the second character to be printed by each hammer, the transducer 61 sends pulses to the Shift register 63 and thus cause the signals stored therein to be shifted out. Again an is assigned Hammer 15 is triggered every time a pulse representing a binary 1 is shifted out of a shift register 63 and prints a point with it. This way, there will be an accurate dot pattern in the top row of dot positions printed in the respective character fields of the second character to be printed by each hammer.

Similarly, five-bit binary code characters become consecutive stored in the shift registers 63 to reflect the patterns produced by each hammer in the top row of the Dot positions of each subsequent character field are to be printed so that - as already mentioned - the patterns are consecutive to be printed. This process is repeated until the pattern is in the top row of the character fields the entire line with one hundred and thirty-two characters is printed. At this point in time, the drum 11 has completed one revolution, and the timing disk 55 operates via the • Converter 59 the triggering of a pulse which is fed to the logic and control circuit. As the paper web to be printed is continuously advanced, the paper is in the printing position for the second row of dots of the first, through each one Hammer arrives at the moment to be printed at which the roller has completed one revolution. As the roller continues to rotate, it is repeated via the logic and control circuit 65 the process by which the five-bit registers 63.

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padded with five-bit code characters that correspond to the s wide row of the dot positions of each character field correspond to dot patterns to be printed. When choosing the right In the shift registers 63 to be stored code characters, the logic and control circuit 65 speaks in turn to the Six-bit binary characters that are stored in the single-line buffer 53 are stored «laughs at the printing of the second line of dot positions the third "to the seventh line of the dot positions of each character field is printed in a similar pattern distribution, so that the entire line of alphanumeric characters is now printed corresponding to that in the single line buffer 53 stored binary characters. If a whole line is printed so the character input memory 56 transmits that of the next to be printed line corresponding alphanumeric characters to the single line buffer memory 53, whereupon via the inventive Printer prints the next line of alphanumeric characters in the same way.

Like Pig. 5 shows, the single line buffer memory 53 comprises a plurality of 66-bit shift registers 71, each one of the hammer 15 are assigned. Since twelve hammers 15 are provided in the preferred embodiment of the invention, there are also twelve shift registers 71 correspondingly. In eleven six-bit characters are stored in each of these shift registers 71, which correspond to the eleven alphanumeric characters, by the assigned hammers in a print line on the Paper web are to be printed. If the shift pulses are fed to one of the shift registers 71, then the first binary drawing corresponding signals in the shift register are stored, pushed out at the front end of the register and at the same time at the rear end of the register re-entered what is indicated by the channels 73. The shift registers 71 are from the character input memory 56 via a conventional circuit, not shown, with Binary drawing padded. After a new line of binary

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When the shift register 71 has been written, the printer is for printing a new line of alphanumeric characters ready. A signal now arrives from the character input memory 56 to a Plip-Hop 75 and sets this flip-flop 75 so that a gate 77 is activated. The next pulse generated by the transducer 59, which occurs when the roller 11 is in the starting position reaches a flip-flop 79 via the activated gate 77, which is set in such a way that an activation signal reaches a gate 81, which is then generated by a clock pulse generator Receives 83 clock pulses with a frequency of 250 kHz. In order to allow the supplied clock pulses to pass through, the gate 81 must also receive an activation signal from the flip-flop 85.

Due to the rotation of the roller 11 upon reaching the starting position The pulse generated by the transducer 59 is also sent to a counter 87, a twelve-bit ring counter 89 and a counter 91 to set the counters 87 and 91 to zero and the ring counter 89 so that a count of 1 is registered will. If the counter 87 is set to zero, it in turn sets the flip-flop 8-5 in a switching state that an activation signal is delivered to the gate 81. After thus the flip-flop 75 by a signal from the data input memory has been set, the flip-flops 79 and 85 are set when the next pulse is generated by the transducer 59 when the Roller 11 reaches its starting position and thus the gate is activated. If this gate 81 is activated, it runs through the clock pulse generated by the pulse generator 83 passes through the gate 81 and arrives at a set of twelve AND gates 93, one for each shift register 71, and also get these clock pulses to the counter 91, which in turn now begins to count the 250 kHz clock pulses.

The twelve-bit ring counter 89, which is determined by the converter 59 when Passage of the roller 11 generated by its initial position

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Pulse has been set so that it has a content of one, now activates the uppermost gate 93, whereupon the 250 kHz clock pulses pass through this gate 93 to the shift input of the uppermost register 71, which is the first or on the far left standing hammer associated with the printer. The output signals, corresponding to binary data appearing at the front end of one of the shift registers 71 become a corresponding one Output gate 95 supplied.

The twelve-bit ring counter 89 activates a gate 93 at the input of a shift register 71, it simultaneously activates an assigned output gate 95 to the shift input of the uppermost register 71, the binary data signal pulses that are on the front side of this pass through Shift register 71 are shifted out, an associated gate 95 at the output of the shift register and then an OR gate 97 and arrive at a series-parallel converter 99. The clock pulses that pass through gate 81 also arrive to the series-parallel converter 99, so that the output signal pulses, which are pushed out at the front end of the uppermost shift register 71, now also into the series-parallel converter 99 can be inserted. The counter 91, which counts the clock pulses passing through the gate 81, arrives at counting of the next pulse after reaching an amount of five again in the counting state zero. Are the top shift register 71 six shift pulses have been supplied, the counter 91 likewise jumps back to the state zero and generates an output pulse. This pulse is generated by the ring counter 89 counted; which thus has a content of two and thus switches so as to activate the input and output gates 93 and 95, corresponding to the shift register 71 which is on second from the top in Pig. 5 is shown. This means that only six bits, which consist of the first binary character in the uppermost shift register 71 is stored, out and iii the series-parallel converter 99 inserted.

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The signals corresponding to the binary characters stored in the serial-parallel converter 99 are stored in parallel in a read-only memory 101 supplied. The output signal generated by the counter 91. is also supplied to the read-only memory 101, which in response to the pulses received from this counter 91 a] ?: five-bit binary code signal from an address reads out the binary characters present in the serial / parallel converter 99 and the content of the in a row counter 103 stored value is determined. When the data input memory sends a signal to the Plip-Plop 75 and thus indicates that the shift registers 71 with binary characters corresponding to alphanumeric characters to be printed in a line are filled, a signal is sent to the row counter 103 at the same time, so that it is set to zero. Will now the transducer 59 generates the next pulse, the row counter 103 counts this pulse. The counter thus contains 103 a content of one when the counter 91 has an output pulse after the signal pulses representing a binary character have been read out from the uppermost shift register 71 and are written into the serial parallel converter 99. In read-only memory 101 there is a at each memory address Binary code character to be printed in a horizontal line Dot pattern corresponds. These dot patterns can be selected so that any alphanumeric character can be constructed from them. The binary code character or the binary code key, which is transferred from the corresponding memory position through the in the converter. 99 standing binary number and the counting content of the counter 103 is selected, corresponds to a dot pattern of the alphanumeric character, which can be represented by the binary character in the converter 99. The point pattern read out continues to correspond to Line represented by the contents of the counter 103. The signals determining the first binary character are therefore off the uppermost shift register 71 is read out into the converter 99, as a response to the generated by the counter 91

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Pulse on the Hur read memory 101 read out signals that a Dot pattern for the first line of the first character stored in the top shift register.

The signals read out from memory 101 become parallel to one another Row of gates 105 supplied, each of which is assigned to a hammer 15. The twelve-bit ring counter 89 has a content from one to one, it activates the gate 105 assigned to the first hammer, which gate is also assigned to the uppermost shift register 71 is. As already mentioned, the counter 91 generates an output pulse. Bar ring counter 89 counts the supplied pulse and registers a count, corresponding to the gates 95 and 95 in correspondence with the second uppermost shift register 71 in Pig. 5 to activate. At this point in time, the gate 105 associated with the first hammer is activated prevented by the ring counter 89, while on the other hand the gate 105 assigned to the second hammer is activated. Before however, the ring counter 89 can have a count of two and thus the activation of the gate 105 »that is assigned to the first hammer, can interrupt, causes the pulse generated by the counter 91 that the dot pattern corresponding to the transducer 99 is read out and activated via the Gate 105 is written into the shift register 63 corresponding to the first hammer. In this way, the corresponding to the dot pattern of the first character line to be printed in the first or left character position Binary signals in the shift register assigned to the first hammer 63 enrolled.

After the signals representing the first character are read out and fed into the transducer in response to the first six, the gate 81 passing clock pulses have been written, as already mentioned, by the twelve-bit counter 89 the

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Gates 93 and 95 correspond to the second shift register from the top 71 activated. As a result, the next six pulses passing through gate 81, shifting to the first, im signals corresponding to characters stored in the second shift register 71. These signals go through the appropriate one Output gate 95 and gate 97 and are written into serial-to-parallel converter 99. After reading out of the six signal bits from the second shift register 71, the counter 91 again runs to zero and generates an output pulse, which causes in turn the signals corresponding to a line of dot patterns from the read-only memory can be read out. Since the row counter 103 still has a content of one, the dot pattern corresponds to that of the first line of the character that is present in the series-parallel converter. This sign is just before from the top one Shift register 71 in Pig. 5 has been read out. The signals corresponding to this dot pattern are supplied to the gates 105. The ring counter 89, which has now advanced to a count of three in response to the output pulse of the counter 91 , when these signals are read out from the read-only memory 401, still contains a content of two, so that the gate 105 associated with the * second hammer is still activated. The signals thus pass through the activated gate 105 and are in the second hammer of the Printer associated PÜnf-bit shift register 63 is stored. This means that the signals that correspond to the dot pattern are the first Line corresponding to the first character in the second shift register 71 into the J five-bit shift register assigned to the second hammer 63 enrolled.

Every time - as mentioned - a six-bit character is read out and written into the serial / parallel converter 99, the twelve-bit counter 89 moves to the next counting state

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before, so that a character is read out from the next shift register in the serial-parallel converter. Immediately after This readout in the converter 99 causes the output pulse generated by the counter 91 that a dot pattern in the correct shift register 63 is stored. In this way it is achieved that each of the five-bit shift registers 65 stores a pattern of dots corresponding to the first line of the first character in the corresponding 66-bit shift register 71. If the first character in the last shift register 71 has been read out into the converter 99, the ring counter 89 also activates the input and output gates 93 and 95 of this shift register also a gate 111 which is acted upon by the output pulse which arises when the counter 91 jumps back to Hull. As a result, the passes through the counter 91 generated pulse when the first character is read out of the last shift register 71, the gate 111 and sets the Flip-flop 85 back so that it no longer activates gate 81, and thus the clock pulses from the 250 kHz clock pulse generator 83 at gate 81 are stopped.

The counter 87, which counts the pulses generated by the transducer 61, jumps after counting the next pulse after it has been reached a count of six back to full. While the shift register 63 have been filled with signals corresponding to the dot patterns in the manner described above, the signals from Converter 61 via the clock wheel 57 are counted by a counter 87 pulses. Before this counter 87 has a content of two can achieve, all twelve shift registers 63 must in the manner described above with those corresponding to a line dot pattern Signals had been filled. If the counter 87 then reaches the count; two, so he activates a gate 113, which continues to remain open until the counter 87 jumps back to zero after reaching the counting content six and thus the activation of the gate 113 interrupts. The gate 113 are also generated by the clock wheel 57 via the converter 61

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generated pulses which - if this gate is activated - reach the shift register 63. Run through with it the four pulses generated by transducer 61, while counter 87 counts from two "to six, through gate 113. The next, The pulse generated by the transducer 61 causes the counter 87 to jump to Mull, whereupon the gate 113 is no longer activated "remains. This pulse, which causes the counter 87 to jump back to Bull, also runs through - because of the inherent delay of the counter 87 when jumping back to zero - the gate 113 * A sequence of five pulses thus passes through gate 113 to find the ones representing the dot patterns in the shift registers Signals from these shift registers to the hammer driver scarf Lines 67 pass on in order to effect the printing of the dot pattern on the paper web. This will be the first Line of the first character corresponding dot pattern, which is stored in each of the shift registers 71, on the paper web printed. Indeed, in the first, the twelfth, the twenty-third, the thirty-fourth, the forty-fifth, the fifty-sixth, the sixty-seventh, the seventy-eighth, the ninety-eighth, the one hundred and twenty-second character positions in the print line are printed.

The signals representing the binary characters that are sent to the shift register 71 are pushed out, are returned to the back of the register, so that when the first Character has been pushed out of each of the registers, this first character is stored again on the back of the register, " while the second character in each shift register is on the front of the register. These characters are now available for transmission in. the converter 99 ready »

When the dot pattern corresponding to the first line of the first character in each register 71 is printed and the seven-bit counter 87 jumps to zero, the counter 87 delivers a signal

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nal to the Plip-tflop 85, which is then set again and gate 81 is activated. In turn, clock pulses from clock pulse generator 83 pass through gate 81 to the gates 93, the counter 91 and the converter 99. The output pulse generated by the counter 91, which resets the flip-flop 85, see above that the gate 81 no longer remains activated, brings the ring counter 89 again to the count one, so that this Ring counter in turn activates the input and output gates 93 and 95 and the gate 105, which is the uppermost shift register and is thus assigned to the first hammer. The device then operates in a manner similar to that described above, i.e. the shift registers 63 are filled with signals corresponding to row dot patterns corresponding to the second in each of the shift registers 71 stored characters belong. These dot patterns still belong to the dot pattern of the first line because the Row counter 103 always has a content of one. While the registers 63 are still being filled in the manner indicated, the counter 87 counts those generated by the converter 61 Output pulses, and the filling of registers 63 is finished before the counter 87 reaches counting state two. If the counter 87 reaches this state two, the gate becomes 113 is again activated by counter 87, and the next five pulses generated by transducer 61 pass through the Gate 113 and push out the line dot patterns stored in the registers 63, which are then printed on the paper web will. These patterns are in the second, thirteenth, twenty-fourth, thirty-fifth, forty-sixth, • Fifty-seventh, sixty-eighth, seventy-ninth, ninetieth, one hundred first, one hundred and twelfth, and one hundred and twenty-third Character position printed in the print line. These patterns are printed in these positions as the coiled ones Bar 13 faces these character positions at the moment! "to which the characters are read from register 63 will. This relation inevitably occurs because the sliding

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impulses that cause the readout at the shift register 63 ", correspond to the tenth "to thirteenth pulses generated by the transducer 61 after the roller 11 has reached the initial position has passed through, with the seven-bit counter 87 again being full has gone through and has a count of two before these special dot patterns are read out at the shift register 63.

The pulse which causes the last dot position of the patterns stored in the shift registers 63 to be read out brings about also the seven-bit counter 87 again to the counting state zero, so that the gate 113 no longer remains activated. to at this time, the third character stored in each of the registers 71 is sequentially transferred to the serial-to-parallel converter 99 is read out, and in response, row dot patterns are read out from read-only memory 101 and placed in the shift register 63 overwritten. Since the row counter 103 still has a content of one, all of these row dot patterns correspond the patterns of the first character line which are read out from the shift registers 71 to the converter-99. the Row dot patterns are then shifted out of the shift registers 63 in the manner described above and onto the paper web printed. In this way, the first row dot patterns of the third character corresponding to each hammer will be printed. Similarly, the characters remaining in each of the registers 71 are read and become the corresponding one Row dot pattern printed by the hammer for each character. Are all characters read from the shift registers and If the row dot patterns corresponding to each pattern are printed, this is the printing process for the top row dot pattern printed for each of the 132 characters.

Immediately after printing the last row dot pattern and before the next pulse is generated by the transducer 61, the roller 11 comes to its starting position and causes

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the transducer 59 generates an output pulse which the row counter 103 is supplied and brings its count to two ". At this point in time, the counter 87 should have a content of Hull, while the twelve-bit ring counter 89 should have a content of one and the counter 91 should have a content of zero. Should be due to a malfunction in any of these meters do not have the specified content, the output pulse of the converter 59 reaches this counter and thus sets the counters 87 and 91 to full, while the content of the counter 89 is set to one. At this point are too the characters stored in each of the registers 71 are completely returned since the last character is read from each of the registers and has been pushed back into the corresponding register on the back. This is again at this point in time the first character stored in each register 71 on the front side in the associated register.

The printing process repeats itself exactly as described above Manner, except that this time the dot patterns stored in registers 63 to be printed by the printer, the second series of dot patterns of the characters stored in the registers 71 instead of the first series of dot patterns since the row counter 103 has the count state two. Because the paper web during printing is moved further, this row is printed by the printer immediately below the first row. In a similar way the third through seventh rows of dot patterns are printed for each character until the counter 103 becomes seven. When the counting state seven is reached, the next pulse generated by the transducer 59 brings the row counter 103 again to the counting state one when the roller 11 returns to the starting position. Generated when jumping back to one the row counter 103 sends an output pulse which resets the flip-flop and clears the activation signal at gate 81,

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so that no further! clock pulse passes through gate 81 can. In addition, this signal goes to the character input memory to report that the line of characters is printed and that the single-line memory with the registers 71 ″ is ready for recording a new line of characters. This means that the printing process for a line of alphanumeric characters corresponds to the in the binary characters "stored in the shift registers 71" ends.

As already mentioned above, the converter 61 generates each time a pulse when the intersection of the coiled ledge 13 and the hammer blades passes through a dot position in the print line. However, no dots are then printed when the pulses are generated which are a counting of the counter 87 of ETuIl Effect "to two" when the shift registers 63 are filled. This gap between the printed dots in the area of the corresponding Point positions over time while the counter 87 counts from Hull "to two, gives the gaps between the characters. The output of the row counter 103 also resets the flip-flop 75 so that it no longer activates the gate 77. The device is then ready to print a new line of characters ready, and as soon as a signal is received from the character input memory, which reports that the shift register 71 with a new line of characters are filled, begins - since this signal sets the flip-flop 75 again - the printing process for a new line of characters in the manner described above.

With the printer according to the invention with a spiral print roller can be based on the invention and described Structure of the control device for the operation of the hammers and ' due to the new hammer construction alphanumeric characters from binary input characters with very high printing speed represent, so that this printer is particularly suitable for the optical output of the output data from computers or Data processing equipment is suitable. However, it is not supposed to

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remain unmentioned "that the erfindungsgeraässer printer for
■ certain applications or also in sub-combination to corresponding systems can be used independently. For example, the printer can advantageously be used for facsimile printing, in which case the printer logic can be modified accordingly.

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Claims (8)

1A-39 578 Claims η. Printing device with a pressure roller in the form of a helix or with at least one helical pressure bar applied to a pressure roller body, with a drive device acting on the roller axis and with at least one hammer that strikes against the rotating roller or against the pressure bar to print a character , characterized by a device (35,37,43,45,47) for generating a magnetic field which penetrates a wire coil (33) which is connected to the hammer (15) and which is freely suspended in the magnetic field so that when suitably excited a movement of the coil takes place so that the associated hammer (15) strikes against the roller or against the pressure bar (13). 2. Printing device according to claim 1, characterized by a device for receiving binary coded signals corresponding to alphanumeric characters, one responsive to the binary coded signals Logic for controlling the hammer actuation in such a way that the structure of the alphanumeric Characters are made when printing from individual dot patterns. 3. Printing device according to claim 1 or 2, characterized in that a striking edge (10) of the hammer (15) extends over a plurality of character positions along a print line, and that the hammer (15) low inertia and short torsional oscillation period having. 109850/1630 2125G66 4. Printing device according to one of the preceding claims, characterized in that the Hammer has a rotatably mounted frame (23) which carries a striking edge or striking blade (17), and that the coil is connected to the blade. 5. Printing device according to one of the preceding claims, characterized by preferably im Dampers (48) arranged in the region of the ends of the striking blade (17) for damping vibrations of the hammer (15). 6. Printing device according to claim 1 or one of the other preceding claims, characterized in that that the device for generating the magnetic field has a permanent magnet (45), a core (35), which penetrates the coil (33) and has a pole piece (37) that largely encloses the coil (33) in such a way that the magnetic field generated by the magnet is concentrated in the area of the coil. 7. Printing device according to claim 2, characterized in that that the hammer (15) is assigned a device which, when the coil (33) is not energized, Holds the hammer away from the roller or pressure bar. 8. Printing device according to one of the preceding claims 1 to 7, characterized in that 109850/1630 that part of the hammer (15) is made of a material of high permeability, and that the hammer at non-energized coil due to the force of attraction of the hammer which is made of highly permeable material Permanent magnet is pulled away from the roller or the pressure bar. Printing device according to one of the preceding claims, characterized in that the W.endel or the helical pressure bar (13) applied to the pressure roller body, several turns has, and several hammers (15) in the area of the outer surface line of the helix or the helical Pressure bar are arranged so that the striking blades of this hammer each have a different turn of this helix or cover pressure bar, and that each.Hammer a coil firmly connected to this and a device for Generation of a magnetic field penetrating the coil is assigned. 1098 50/1630 Blank page