EP0027560A2 - Drucknadelanordnung für ein Druckwerk - Google Patents

Drucknadelanordnung für ein Druckwerk Download PDF

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Publication number
EP0027560A2
EP0027560A2 EP80105771A EP80105771A EP0027560A2 EP 0027560 A2 EP0027560 A2 EP 0027560A2 EP 80105771 A EP80105771 A EP 80105771A EP 80105771 A EP80105771 A EP 80105771A EP 0027560 A2 EP0027560 A2 EP 0027560A2
Authority
EP
European Patent Office
Prior art keywords
printing
print
wires
assembly
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80105771A
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English (en)
French (fr)
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EP0027560A3 (en
EP0027560B1 (de
Inventor
Albert William Oaten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0027560A2 publication Critical patent/EP0027560A2/de
Publication of EP0027560A3 publication Critical patent/EP0027560A3/fr
Application granted granted Critical
Publication of EP0027560B1 publication Critical patent/EP0027560B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/245—Print head assemblies line printer type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements

Definitions

  • the present invention relates to devices for mounting print wires and, more particularly, such devices used in wire matrix printers comprising multiple print heads and several print wires.
  • a print wire control assembly for a wire matrix printer operating at high speed and which can be composed of a large number of print wire control devices and printing wires arranged along a printing line, the control devices being arranged so that the ends of the printing wires define a sawtooth configuration.
  • the structure of the assembly is such that one can easily access any printing wire or a certain number of them and remove them for maintenance without disturbing the adjacent print wire and print wire controls.
  • the control devices are mounted in two groups so that the ends of the printing wires of each group are aligned and that the two planes defined respectively by the axes of the printing wires of each group make a determined angle between them .
  • Figure 1 is a schematic representation of an exemplary system which includes a main system 1 and the printing subsystem 2 which itself includes a printer control unit 3 and a set of electronic circuits 4.
  • the control and data signals are delivered from the main system via the interface 5 and the execution and control signals are delivered by the print control unit 3 to the circuits.
  • printing electronics 4 via the control bus bar 6.
  • the status signals are supplied by the printing control unit 3 to the main system 1 via the interface 5.
  • D ' in a conventional manner, the main system 1 generates information comprising orders and data and monitors the states.
  • the print control unit 3 receives the control and data signals, decodes the commands, searches for errors and generates status information, controls the printing and spacing and conducts print diagnostics.
  • the electronic printing circuits 4 execute decoded commands coming from the control unit, control all the operations of the printer, control the printing wires, control the motors, detect the transmitter signals from the printer and control the operator panel lights and switching circuits. These same electronic circuits control the drive-platen mechanism, the ribbon drive, the carriage carrying the print head (i.e. the control unit), the operator control panel and the printer detectors.
  • control unit and the electronic circuits of the printer include one or more microprocessors or microcomputers for analyze orders and data and to order operations.
  • FIGS 2 and 3 show various elements of the printer which are all housed in the console 10. Also shown are various access panels or covers such as elements 11, 12 and 13.
  • the top cover 11 has a window 14 which, when closed, allows the operator to observe the movement of the paper during printer operation.
  • the sheets (documents) 15 are delivered from a stack 16 and can be driven up or down as seen in Figures 2 and 3 by means of a sheet feeding assembly 20 which includes one or more sets of sheet driving elements such as the upper tractor assembly comprising the driving elements 90 and 91.
  • a sheet guiding element 28 guides these, after printing, towards a stack of reception which is not shown but is arranged below the printing mechanism and at the rear of the printer console.
  • the printer includes a printing assembly 30 which is generally disposed horizontally relative to the sheets 15 at the printing station 32.
  • the printing assembly 30 is shown more clearly in other figures. This is also true with respect to the printer ribbon drive assembly 40 which is disposed in the vicinity of the front of the printer.
  • a ribbon 41 is wound on one of the reels 42 or 43.
  • Each ribbon box will preferably contain a protective ribbon element 46 located between the printing assembly 30 and the sheets 15 to keep the ribbon 41 in proper alignment and to minimize ink stains on the sheets 15.
  • Two motors drive the ribbon 41 in a reciprocating movement between the coils 42 and 43.
  • the print control unit detects any ribbon jams and the end of the ribbon run (EOR).
  • EOR end of the ribbon run
  • a ribbon jam turns on an indicator light and stops printing.
  • An EOR state reverses the direction of the ribbon drive.
  • the printer includes an operator control panel 26 which is comprised of multiple control keys, two LEDs, a two-position on / off power switch, and the operator display panel.
  • a 16-position operating mode switch 65 has a direct position which allows printing to be controlled by the user system. All other positions are independent and do not allow printing to be started by the user system.
  • FIGS. 4 to 9 are detailed representations of the sheet feeding assembly 20, the printing assembly 30 and the ribbon drive assembly 40.
  • the sheet feed assembly 20 has end plates (side frames) 21 and 22 which carry the various sheet feed mechanisms including a drive motor 23 which drives the tractor elements 90 to 93 by the intermediate of the toothed belt 109 and a plate 29 disposed behind the sheets and against which the printing wires 33 are applied during printing.
  • the motor 23 includes a sheet feed transmitter assembly 24. A transmitter indicates the end of the paper and the jamming of the sheets,
  • the printing assembly 30 comprises a base 75 carrying various mechanisms comprising the printing motor 76, represented in phantom lines in order to be able to more easily represent other elements, and which is excited to drive a head carriage printing 31 with the control unit 77 in a horizontal back-and-forth movement for printing on a sheet inserted into the printer.
  • the printing assembly also drives a printing emitter 70 comprising an emitting glass 71 and an optical detection assembly 72.
  • the ribbon drive assembly 40 comprises a support frame 44, a cover 45 and drive motors 49 and 50.
  • the sheet feeder assembly 20 pivots and moves away from the base 75 at pivot points 80 (80a) and 81 (81a) to allow the paper to be fed into the machine.
  • the latches 83 and 84 are lifted by the operator so that the ends 83a and 84a are released from the eccentric fingers 85 and 86 of the sheet feeding device.
  • the sheet feeder then pivots away from the operator as seen in Figures 2 to 4 and to the right as seen in Figure 6. This provides access to the drive devices 90-93 so that the operator can load the paper.
  • the sheet feed assembly is then closed and relocked by the latches 83 and 84 to allow normal operation of the machine. While the sheet feeder assembly is rotated rearward to return it to service, a switch 94 prohibits operation of the machine. This switch is actuated by a tab 95 of the sheet feeding assembly when the latter is closed.
  • Figures 4 to 9 also show the sheet feed assembly which includes means for adjusting the machine according to the thickness of said sheets.
  • the entire sheet feeder assembly pivots rearward and clears from the rest of the printer around pivot points 80 and 81.
  • the sheet feeder assembly allows a spiral guide element 96 to urge a finger 97 from the main carriage shaft 98 of the assembly printing 30.
  • the adjustment of the spiral guide element 96 is such that it causes the rotation of the main carriage shaft 98.
  • the element 96 is retained in position by a locking assembly loaded by spring.
  • This assembly includes a spring loaded finger which engages in the notches of element 9.6 so as to be maintained in the position established by the operator.
  • eccentrics such as the part 98a of the left end of the shaft 99 comprising the stud 100 on which the lock 83 engages.
  • the rotation of the shaft 98 thus releases the locks 83 and 84, which modifies the distance separating the ends of the printing wires 33 from the plate 29.
  • This adjustment allows the printer to receive sheets of various thicknesses.
  • the printer can handle sheets ranging in thickness from 1 to 6.
  • Paper is supplied by the four sets of tractor elements 90-93. Two are arranged above the printing line and two below the printing line.
  • the individual drive elements comprise drive chains to which are attached fingers separated by an appropriate distance allowing their engagement in the holes of the sheet.
  • the drive element 90 comprises a drive chain 101 having fingers 102.
  • the chain 101 is driven by a wheel 103 fixed to a shaft 104 which also drives the wheel and the chain of the drive element.
  • the drive elements 92 and 93 are driven from the shaft 10.5. Due to the fact that the drive elements are arranged above and below the printing line, the printer can move the paper in either direction.
  • the normal sheet feeding direction is up in Figures 2, 3, 4 and 6. However, it is also possible to feed the paper down.
  • the driving of the shafts 104 and 105 in rotation and the feeding of the leaves are provided by the motor 23 in the appropriate direction, which causes the pulleys to be driven 106 and 107 (to which shafts 104 and 105 are connected) from the motor pulley and via the toothed drive belt 109,
  • the cover 110 protects the belt 109 and the pulleys 106-108 during their rotation .
  • the sheet feed transmitter assembly 24 includes a transmitter wheel 47 bearing marks to indicate its rotation and a light-emitting diode assembly 48 used to indicate the amount of rotation of the motor 23 in one or the other. another direction and, consequently, the importance of the movement of the sheets when they are driven by the motor 23.
  • the printer's ability to feed paper in two directions has certain advantages. For example, in order to better see the print line when the stop button is pressed by the operator, the paper can be moved up a few centimeters above its normal position so that it can be easily read and adjusted to its proper position. When the start key is pressed, the paper is returned to its normal printing position and the print line is no longer visible to the operator.
  • the printer can also be used in case tracing operations are necessary. In this case, a plot can be obtained by calculating one point at a time and moving the paper up and down like a plotter rather than calculating the complete curve and printing it from the top at the bottom as for the scanning of a frame.
  • the frames 88 and 89 carrying the drive elements 90-93 can be adjusted to the left or to the right by a coarse adjustment operation in order to adjust the machine according to the size of the sheets used for a particular application. After an appropriate positioning, the frames are locked in position on the shaft 67 by locking screws such as the locking screw 87.
  • All the drive elements are driven by the two shafts 104 and 105 from the motor 23 as described above.
  • the position of the motor is adjusted in the lateral frame 21 by means of the recesses 120 in order to ensure an appropriate tension of the belt 109.
  • a fine adjustment to adjust the position of the printing on the sheets in very small steps.
  • This operation is ensured by a notched button 66 which urges the shaft 67 to which the two frames of the drive elements are fixed. This shaft floats laterally between the lateral frames 21 and 22. The notches of the button urge the threads of the right end of the shaft 67.
  • the button is held in a fixed position by a fork 68. The button 66 therefore remains in a fixed position and the notches laterally drive the shaft 67 to the left or to the right, depending on the direction in which the button 66 is turned.
  • the shaft 67 is always returned in one direction by a spring 69 arranged on the end left of the tree.
  • a spring 69 arranged on the end left of the tree.
  • an adjustment operation is carried out.
  • This adjustment operation is ensured by the introduction of a template or a piece of paper into the drive assembly, which places the lower fingers in an appropriate position relative to the upper fingers.
  • This operation is ensured by loosening a collar 121 located on the end of the shaft 104. Once this position is obtained, the collar 121 is tightened and indeed, the upper set of drive elements is in correspondence with the lower clearance so that the perforations of the paper are correctly requested by the two sets of drive elements.
  • Sheets can be driven brought into the sheet feeding mechanism by turning the button 122. This button simply biases the upper drive shaft 104 of the upper drive assembly and via the toothed belt 109 , causes the lower drive assembly to rotate.
  • Figures 4 and 9 show a carriage 31 comprising a control unit 77 and the support 78; this carriage can receive all the print heads with their wire control devices 35 and the print wires 33.
  • This assembly is structured so as to be able to receive 2 to 8 or 9 groups of print heads from eight order each.
  • a printer having eight groups of printheads as shown in Figure 4, has 64 print wire controls and 64 associated print wires. Only two control devices 35 are shown in Figure 4. The other 62 control devices would be arranged in the openings 133, some of which have been shown. So that the print wires have a long service life, lubrication assemblies 134 containing wicks of lubrication are arranged near the printing wires.
  • the print thread controllers control the threads to print dots that form characters.
  • the carriage 31 is driven back and forth by an endless screw 36 controlled by the motor 76.
  • the endless screw 36 drives the carriage in a back and forth movement by means of nuts attached to the carriage.
  • a cam 37 fixed to the carriage, urges a finger 38 fixed to the main carriage shaft 98. If the machine has not carried out printing for a certain time, (de the order of a few seconds), the print control unit indicates to the carriage that it must move completely to the left, in which case the cam 37 requests the finger 38 to drive the main carriage shaft 98 in rotation over approximately 15 °.
  • Eccentric fingers such as finger 100 described above are mounted at each end of the shaft. These fingers urge the latches 83 and 84 so that the distance between the printing assembly and the paper drive assembly is controlled by the latches. When the shaft 98 is rotated, the eccentrics associated with the locks 83 and 84 separate the paper drive assembly from the printing assembly.
  • the current required to energize the print controllers is applied to them by the wiring assemblies 73 f Figure 9, one set being provided for each group of eight controllers.
  • the wiring such as the cable 73a, Figure 4 is arranged in the machine in a semicircular loop so that when the carriage 31 is moved back and forth, the cable can be wound according a certain radius and therefore undergoes no undue stress. This loop is formed and maintained by a steel flange 74.
  • a set of cables is provided for each group of eight control elements or a maximum of eight groups of cable holding clamps on each machine.
  • the ribbon drive assembly 40 of the printer is shown mainly in Figures 3, 4 and 9.
  • Figure 3 shows the spools 42 and 43 which carry the ribbon on each side of the machine near the front of this one. These reels carry, in a conventional manner, 150 meters of a 3.8 cm wide nylon ribbon.
  • Figure 4 shows flanges 118 and 119 which hold the ribbon coils 42 and 43 respectively.
  • the coil 43 is driven, for example, by the motor 50, via the pinion 132 which drives a corresponding pinion 123 machined in the lower side of the flange 119, the movement then being transmitted to the spool 43.
  • the ribbon leaves the left spool 42, passes through the balusters 125 and 126, Figures 3, 4 and 9, crosses the front of the ribbon drive assembly located between the print heads 34 and the sheets 15, then passes through the balusters 127 and 128 and enters the straight ribbon spool 43.
  • the protective element of the ribbon is generally disposed between the balusters 126 and 127 and is mounted on two flexible fastening elements 130 and 131.
  • Figure 7 shows a protective tape 46 more particularly used in the printer shown in Figures 3, 4 and 9.
  • Figure 8 is a sectional view taken along lines 8-8 of Figure 7.
  • the element protective 46 has an elongated opening 46a extending substantially over its entire length. The opening allows the print wires 33 to be applied against the ribbon in the printer through the protective element in order to ensure printing on the sheets 15.
  • the element 46 has slots at its opposite ends 46b and 46c which facilitate its mounting in the printer on the flexible elements 130 and 131 of the ribbon drive assembly as shown in FIGS. 3 and 6.
  • the element 46 and the Ribbon 41 are shown slightly at an angle in Figures 3 and 6, which constitutes a more normal position in the printer.
  • the tape drive assembly 40 is also disposed slightly at an angle to the horizontal in order to establish the slightly offset angular position of the element 46 and of the tape 41. In this condition, the opening 46a is in horizontal position with respect to the printing wires 33 and to the sheet 15.
  • FIGs 10-22 are enlarged representations of the control assembly 77, guide 79, control devices 35, lubrication assemblies 134, and various other associated mechanisms.
  • Other versions of the control assembly for 2, 4, 6 and 8 printheads are shown in Figures 23-26 and will be described briefly. Referring to FIG. 10, it can be seen that this represents the arrangement of the passages 133 provided in the control assembly 77.
  • the passages 133a are used to mount control elements 35 while the passages 133b allow passage rods 136 of the control elements 35 through the control assembly 77 and the guide 79 to the printing line.
  • a conventional lubrication assembly 134 includes a cover 140, a felt member 141, a lubricating wick 142 and a housing 143 which contains lubricating oil.
  • Figure 11 shows a part of the face 79a of the guide 79 while Figure 12 shows a part of the face 79b of the guide 79-.
  • the rods 136 of the control devices 35 pass through the passages 145 of the face 79.a of the guide 79 and are retained by bolts such as the bolt 146 passing through the passages 147 from the opposite side of the guide 79.
  • Control rods 136 and printing wires 33 knock out openings 148 shown in FIGS. 9 and 12.
  • Figures 13 to 18 show several arrangements which allow the mounting of a greater number of control devices in a given space through the assembly of 77 and Guide 79.
  • Figures 13-15 illustrate a possible mounting arrangement for the control devices while Figures 16-18 illustrate the actual mounting arrangement described above with reference to Figures 4-9 and 10- 12.
  • Figures 13-15 show print control devices 35a and their associated print wires for an eight-wire print head (1-8), the eight wires being arranged on a straight slope 150.
  • This distance separating the printing wires from the platen and which is referenced 8x, is critical both as regards the travel and the flight time of the printing wires.
  • Figures 16-18 The preferred arrangement of Figures 16-18 has a number of advantages including improved operation, increased space for the coils and greater ease of manufacture.
  • the printing wires arranged in a set 1-8 are mounted in two offset subsets 152a and 152b forming a sawtooth configuration.
  • the sub-assembly 152a comprises the printing wires 1-4 of the assembly while the sub-assembly 152b comprises the printing wires 5-8.
  • This arrangement combined with a straight surface 153 of the control assembly 77 and the angularly interlocked actuating devices 35, FIG. 17, ensures the alignment of the ends of the printing wires facing the platen as shown in FIG. 18.
  • the distance "x" separating the printing wire end from the platen is a minimum distance. It allows a higher printing speed and avoids wire breakage.
  • the angular offset of the sets of printing wires allows greater spacing of the wires, which allows the use of a control coil of larger dimensions.
  • Figures 19-22 show a preferred type of control device 35.
  • This control device is based on the operating principles described and claimed in the patent application EPO 80.101919.1 filed by the applicant on 10.04.80.
  • a printing wire is presented comprising an armature which is retained in the rest position by a permanent magnet.
  • an electromagnet When dot printing is to be performed, an electromagnet must be energized to overcome the magnetic forces exerted by the permanent magnet and to draw the printing wire to the paper.
  • Figure 19 is a side view of the control device while Figure 2Q is a view from the opposite side.
  • the control device comprises a certain number of elements arranged in a generally concentric manner on the support 155. It will be noted that Figure 20 is somewhat enlarged with respect to Figure 19. Reference will also be made to Figures 21 and 22 for a more detailed representation of the various elements making up the control device. In addition, it will be noted that certain minor differences in structures appear between the control device in Figures 19-22 and those shown in Figures 13-18, the control devices in Figures 13-18 being illustrated in a more schematic manner. .
  • the control device comprises a rod 135 which carries a printing wire 33 held in a position suitable for printing when it is mounted in the control assembly 77 and the guide 79.
  • An armature 156 is fixed to the left end of the printing wire 33 as seen in Figure 21 and this armature is applied against a stop 157a of an adjusting screw 157 by the action of forces exerted by a permanent magnet 158.
  • a locking nut 159 Figure 19, maintains the adjustment screw 157 in the appropriate position.
  • the electromagnet 160 is rapidly excited from an external power source via the connectors 161.
  • a coil case 162 made of metallic material provides shielding with respect to the electromagnet 160. It has been found that this arrangement is advantageous when several print control devices are mounted in position on the control assembly 77 and the guide 79 since it prevents parasitic pulses from passing from a control device to the neighboring device. This arrangement has proved particularly advantageous when multiple print control devices are used as in the printer described here.
  • a core 163 determines a position for stopping the front movement for armature 156.
  • Figure 22 is an end view of the housing 162 taken along lines 22-22 of Figure 21.
  • FIGs 23-26 respectively represent the control assemblies which are used in printing units comprising 2, 4, 6 and 8 printheads. These are combined front and end views of the respective printheads.
  • the control assembly for the eight-printhead unit of Figure 26 has been described previously with specific reference to Figures 10-12.
  • Each of Figures 23-26 has a legend providing useful information about the print head.
  • the control assembly for the two-head printing unit has the legend "2-8-11.20.”. This simply indicates that this control assembly has two print heads with eight print wires and that the first wire in one print head is placed 11.20 cm from the first print wire in the other print head. 'impression.
  • the set for four printheads, Figure 24, has the caption "4-8-7.10". This indicates that it is a set with four printheads, each printhead having eight print wires and the first print wire in each printhead is arranged at 7.10 cm. of the first printing wire of the following printing head,
  • the same principles apply to the legends of the control assemblies of Figures 25 and 26,
  • the characters that are printed are dots printed on paper. These dots are printed by wires which are mounted in groups of eight on a carriage 31 which is moved back and forth adjacent to the printing line.
  • the printing is bi-directional, complete printing lines being formed from right to left and from left to right. Reference is made to Figures 27a and 27b.
  • a character is formed on an area eight points high and nine points wide. As seen in Figure 27a, two of the nine horizontal dot positions (1 and 9) are provided for character spacing. Any thread can print a stitch in four of the seven remaining horizontal stitch positions (2 to 8). The printer can print ten characters per inch (2.54 cm) or fifteen characters per inch (2.54 cm).
  • the number of groups of printing wires varies according to the model of the printer and these can be conventionally two, four, six or eight in number.
  • the printing speed increases with the number of thread groups.
  • Figures 27a and 27b when assembled in the form of Figure 28 form a diagram showing the physical relationship between the print heads of the eight head print unit, when these are in position rest, relative to the positions of the characters on a sheet to print. In addition, relationships with issuers are also shown.
  • Figure 27a shows a print head 1 with eight print wires and which is normally to the left of the left margin when it is in the rest position.
  • the print head 2 is located to the right of the left margin when the print assembly is in the rest position and the other print heads, which can reach the number of eight for example, are arranged in positions successively shifted to the right with respect to the sheet.
  • the printing threads are arranged in an inclined sawtooth configuration and a printing thread is separated horizontally from the neighboring printing threads by two character positions and vertically by a point position.
  • it is necessary that all the printing wires of the print head 1 scan the position of the character "H" in order to print the individual dots.
  • each thread passes to the appropriate position for printing its dot positions in the vertical direction, it is triggered.
  • the formation of the characters takes place in a regular manner as far as the printing of the dots is concerned. That is to say that a complete vertical column of dots as in the left part of the character "H” is not formed at once but by a succession of strokes when the eight wires of the head of impression 1 sweep this column. This is true with regard to the printing of all other character columns.
  • each printhead must pass far enough for all of the wires in that printhead to print both the first vertical column of dots in the first character required as well as the last column of dots in the last character to print in the group of character positions assigned to this print head.
  • the print head 1 during the printing movement of the carriage 31, prints all the characters which would normally appear under the print head 2 when the print heads are in their rest position.
  • the printing of the dots associated with the print head 2 takes place under the rest position of the print head 3 and so on.
  • Box 196 illustrates the relationship between real and optional transmitters, which are sometimes referred to as "false" transmitters, for both the ten character per inch pitch and the fifteen character per inch pitch. While the characters are being printed in steps of ten characters per inch, actual transmitters are arranged as shown. These are real physical transmitters derived from the transmitting glass 71 when the printing assembly scans from left to right or from right to left during printing. The same actual transmitters are used for printing in fifteen character per inch steps.
  • an additional transmitter is required between each successive pair of real transmitters to form the individual characters while if the characters are printed in fifteen character steps per inch, two additional transmitters (optional) are required between each successive pair of real transmitters to manipulate the printing of dots for these characters.
  • Box 197, Figure 27a illustrates the character positions associated with the right-most print wire from the print head 2 and the left-most print wire from the print head 3.
  • the heads 4-7 are not shown since their relationships are essentially similar to those shown for the 1-3 printheads.
  • the right-most wires of the print head 8 are shown in box 198, Figure 27b.
  • Box 199 shows that at the rate of ten characters per inch, 132 characters can be printed on a full print line while at a step of fifteen characters per inch, 198 characters can be printed.
  • Figure 29 shows various interesting blocks of the printer.
  • a power supply unit 245 delivers drive and control power to the unit.
  • the on / off switch 240 controls the power supply 245. From the power supply, the hood interlock switch 242 conditions and deconditions the 48 volt drive which controls most of the printing logic 243.
  • Logic 243 once conditioned, searches the operator control panel 26 for information regarding the operations to be performed.
  • the mode switch 65 indicates to the logic which type of test procedure operation is to be performed.
  • the printing assembly 30 is controlled by the printing logic at the same time as the paper feeding assembly 20.
  • the transmitting devices 24 and 70 deliver position information to the printing logic.
  • the printing logic also controls and enters into conversational relation with the interface panel 247 and transfers information to other parts of the printer.
  • the ribbon motors 49 and 50 are all or nothing controlled by the printing logic 243 which receives inputs from the ribbon control assembly to determine the occurrence of an end of ribbon condition.
  • the command 252 ensures the passage of the print head in the appropriate position at the appropriate time for the triggering of the control devices.
  • the 253 paper control is a control block which brings the paper to the desired positions.
  • the fans 254-258 are used to control the temperature inside the machine.
  • the printing logic 243 comprises two microprocessor adapter blocks 200 and 210. The first is the CMA communication adapter which accepts an input and transfers it to the second which is the CTA control adapter which actually controls the printer.

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  • Accessory Devices And Overall Control Thereof (AREA)
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EP80105771A 1979-10-19 1980-09-25 Drucknadelanordnung für ein Druckwerk Expired EP0027560B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/086,483 US4278020A (en) 1979-10-19 1979-10-19 Print wire actuator block assembly for printers
US86483 1993-07-01

Publications (3)

Publication Number Publication Date
EP0027560A2 true EP0027560A2 (de) 1981-04-29
EP0027560A3 EP0027560A3 (en) 1983-01-05
EP0027560B1 EP0027560B1 (de) 1985-05-29

Family

ID=22198853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105771A Expired EP0027560B1 (de) 1979-10-19 1980-09-25 Drucknadelanordnung für ein Druckwerk

Country Status (5)

Country Link
US (1) US4278020A (de)
EP (1) EP0027560B1 (de)
JP (1) JPS5663468A (de)
CA (1) CA1147866A (de)
DE (1) DE3070703D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549419A1 (fr) * 1983-06-24 1985-01-25 Caracteres Sa Tete porte-aiguilles pour machine imprimante
EP0101018B1 (de) * 1982-08-05 1986-11-12 Nec Corporation Schlagdruckkopf, welcher imstande ist, Punkte in einem Abstand voneinander zu drucken, der kleiner ist als die Dicke eines Druckelements

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552064A (en) * 1982-10-27 1985-11-12 Sanders Royden C Jun Dot matrix printers and print heads therefor
US4527469A (en) 1983-04-15 1985-07-09 Dataproducts Corporation Dot matrix print actuator
KR910004028B1 (ko) * 1987-10-15 1991-06-22 도오꾜오 덴끼 가부시끼가이샤 석방형 도트 프린터헤드 및 그 제조방법
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Also Published As

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EP0027560A3 (en) 1983-01-05
CA1147866A (en) 1983-06-07
EP0027560B1 (de) 1985-05-29
US4278020A (en) 1981-07-14
DE3070703D1 (en) 1985-07-04
JPS5663468A (en) 1981-05-30

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