DE2915720A1 - ELECTRONICALLY CONTROLLED WRITER - Google Patents

Abstract

1. Electronically controlled printing mechanism of modular design for either manually or mechanically fed papers, characterized by the following components : a) a basic module consisting of a desk (3), two friction rollers (6) for feeding the paper, a toothed belt (7) which drives them and which is driven by a large wheel (8) via a pinion (9) by means of an electric motor (10), counter rollers (12) for pressing the paper against the two friction rollers (6), a light barrier (14) arranged at one end of the paper track (4) for generating a pulse to start the feeding of the paper when the paper is fed manually from this end, and a second light barrier (15) for generating pulses for the print and control timing which are triggered when the toothed wheel rim of the large wheel (8) passes through the light barrier (15) so that one pulse per column of a needle character and/or per bit of the magnetic type can be picked up at the toothed wheel rim of the gear wheel (8) for the paper transport, and that the number of teeth on the large wheel (8) is selected such that one tooth corresponds to one column of a needle character or to one bit of the magnetic type, respectively ; b) a supplementary module to enable conversion from the longitudinal type to the transverse type process, consisting of a threaded spindle (16) mounted vertically in relation to the paper feeding device for moving a carriage carrying the printing heads (1 and 13, respectively) along the spindle, a rod (17) for guiding this carriage, a large wheel (18) which drives the threaded spindle (16) via a pinion (19) and via an electric motor (20), and a light barrier (21) for generating pulses for the print and control timing which is effected by means of pulses which are triggered when the toothed wheel rim of the large wheel (18) passes through the light barrier (21), with the number of teeth on the large wheel (18) in combination with the pitch of the threaded spindle (16) being selected such that, as in the case of the basic module according to a), one tooth corresponds to one column of a needle character or to one bit of the magnetic type, respectively ; c) a supplementary module consisting of a printing head (13) mounted on the desk (3) for machine-readable type and/or an electronically controlled printing head (1) arranged above the desk (3) for visually-readable type with a ribbon cartridge (2) and a motor, with the printing head (1) for visually-readable type being swivable through 90 degrees at the carriage for conversion from the longitudinal type to the transverse type process, and the control leads for the motors (10, 20) and the light barriers (15, 21) being exchangeable to enable use of the same print program ; d) a supplementary module for mechanical paper feed from the other end of the paper track (4) opposite the light barrier (14), consisting of a third friction roller (6), a wedge member (11) serving as one longitudinal side of the paper feed channel (5), a rocker (22) mounted longitudinally along the other side of the channel, with a brake shoe (26) pressable against the wedge member (11) to clamp the paper, and with a counter roller (23), with the rocker (22), when caused to swivel by an actuating magnet (24), pressing the counter roller (23) against the friction roller (6) to activate the paper feed from this end of the paper track and moving the brake shoe (26) away from the wedge member (11) so that the paper is freely movable through the feeding channel (5), and a pulse-controlled cutting device (30-35) provided at the opposite end of the paper track (4) adjacent to the light barrier (14) ; e) a supplementary module located adjacent to the supplementary module according to d) for generating pulses for proper form synchronization, consisting of a light rod (27) and a phototransistor (28) which scans form sheets provided with control apertures and provides corresponding synchronization pulses.

Description

Licentia Patent-Verwaltungs-GmbH UE 2-B / Qh / bv

Theodor-Stern-Kai 1 B-N 79/7

D-6000 Frankfurt 7ο

Electronic, controlled writing mechanism

The invention relates to an electronically controlled writing unit in a modular design according to the preamble of claim Λ.

There are already writing works for visual and / or maschio5 nell readable writing is known, further writing works for manually pre-inserted individual forms or for automatically transported continuous paper, writing units for one or more retrievable paper formats, writing units for form-independent or form-correct printing as well Writing notes for the lengthwise or cross-writing method. It is also already known to use these writing works electronically to control. All of these writing works are carried out in the most varied of combinations. But there So far there has been no writing that all of the aforementioned Requirements united in itself.

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The task, therefore, is to create a writing system that can be electronically controlled and that has a modular structure is that it is for both visually and / or machine-readable writing, for manually pre-inserted individual forms

o5 or for automatically transported continuous paper, for a or several retrievable paper formats, for form-independent or form-correct printing as well as for the lengthwise or cross-writing method can be used. Through the modular construction should meet the requirement with a minimum of parts by moving or omitting assemblies and construction volume to be realized.

The object is achieved by the measures specified in the claims.

The invention is illustrated below using an exemplary embodiment explained in more detail by means of a drawing.

The following description is always a needle head for the visually readable writing and a magnetic head for the machine-readable font, although other serial writing heads can also be used for the subject matter of the invention are.

In Pig. 1 shows a needle head 1 with an ink ribbon cassette 2, as well as a desk 3 between the needle head 1 and desk 3 is the paper path 4-. In this and the diagonally underneath paper path 5 all paper movements take place. For this purpose, three identical rubber-covered friction rollers 6, which have a common toothed belt 7 through an upstream spur gear consisting of large gear 8 and pinion 9 Electric motor 1o are driven. The two in the paper career 4- lying friction rollers 6 are so tight

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as possible, to the needle head 1 or the ribbon cassette arranged. The friction roller lying in the paper path 5 6 is arranged according to the invention so that it, in conjunction with the wedge 11, the rectilinear movement of a

o5 nes located in the paper path 4 writing paper not disabled. On the desk 3, two identical counter rollers 12 are assigned to the two opposing friction rollers and are rotatably mounted in this. By one, not shown, on the desk. 3 acting spring are the two counter rollers on the two friction rollers 6 pressed.

Depending on the direction of rotation of the electric motor 1o can be between the roller pairs 6 and 12 located paper to the left between Uadelkopf 1 and desk 3 moved back and forth will. For the magnetic writing and reading of a magnetically coated paper there is an in the Desk 3 embedded magnetic head I3 provided.

The paper movement can be triggered e.g. by pushing a paper manually through the light barrier 1A- from the left is plugged to the right and this the electric motor 1o in the direction of rotation starts, which the friction rollers 6 counter-clockwise rotates so that the paper detected by them is conveyed from left to right.

In the simplest case, this paper movement and through appropriate electronic control of the needle head 1 and / or the magnetic head 13 a serial label of a paper. If only written magnetically or is to be read, a plastic card can be used instead of the paper. For correct control of the needle head 1 and / or the magnetic head

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a control cycle is required that has a fixed ratio is related to the paper movement in order to ensure a high level of uniformity of the needle and / or magnetic writing. When the electric motor 1o is a step o5 motor acts, "its steps are usually used as a control clock for writing. Cheaper the use of a motor with a pulse disc, but here the evenness suffers due to the backlash of the teeth required reduction gear. For further cheapening and high uniformity is being developed According to the invention, instead of a pulse disk seated on the motor shaft, the ring gear of the large wheel to be scanned by means of a light barrier 15 (via the toothed belt 7 acts directly on the friction rollers 6). According to the invention, the number of teeth of the large wheel is 8 and the The diameter of the friction roller 6 is matched to one another so that that one tooth corresponds to one column of the 7 columns of a needle font or one bit of magnetic writing. By the clocking of the heads 1 and / or 13 by means of the light bar 15 play speed fluctuations of the paper drive no longer matter. After completing the line of writing, After the specified number of cycles, the motor 1o switches to reversing operation be switched so that the written paper is ejected to the left again.

The sequence described above can only be a single line because of the rigidly mounted write heads 1 and / or 13 Deliver writing. However, if the print heads 1 and / or 13 made displaceable perpendicular to FIG. 1, can several lines can be written on paper. Only the shift is of practical interest here of the needle head 1. Needle head 1 and ribbon cassette 2 are mounted on a carriage, not shown, with

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its nut thread engages in the threaded spindle 16 and is guided on the rod 17 »The threaded spindle 16 is with large gear 18 from the pinion 19 of the electric motor 2ο driven. The pinions 9 are expediently the same

o5 and 19 as well as motors 1o and 2o. The ring gear of the large wheel 18 is scanned by the light barrier 21 as previously described for the large wheel 8. An electronic counter (not shown) counts the pulses generated at the light barrier 21 when the threaded spindle 16 rotates and can thus bring the needle head 1 to a standstill at predetermined numbers of pulses. (The electronic line tab is set with this input pulse.) Between the line jumps caused by motor 2ο, the paper is moved back and forth by motor 1o for the purpose of writing a line. "Backward ^{writing 11} every second line saves idle movements and time. The line lengths are defined by counting the pulses at light barrier 15 and comparing them with the specified pulse numbers (column tab). Normally, the Motorenio and 2o always work alternately. With simultaneous specification of pulse number pairs for Line and column, however, plotter operation is also possible.

In a further embodiment of the invention it is provided that the needle head 1 with ribbon cassette 2 also perpendicular to the position shown in Fig. 1 on the not shown Slide can be mounted. According to the invention it is also provided that the number of teeth of the large wheel 18 and the pitch of the threaded spindle 16 so matched to one another is that a tooth corresponds to one of the seven columns of a needle character. The threaded spindle 16 moves then the needle head 1 with the ribbon cassette 2 mounted for cross printing in the direction of the cross printing line. By

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the aforementioned measure is achieved that the electronic The writing program can remain completely identical for longitudinal as well as for Q, headers; only the supply lines have to be used of the motors ο and 2o as well as the supply lines of the light

o5 barriers 15 and 21 are interchanged. That Cross-writing method (line direction transverse to the direction of paper transport) is often opposed to the length-writing method preferred because the paper movement is less (but the head movement is greater) and because a journal strip label is only possible across.

In the writing processes explained so far, the paper was always fed into the writing unit by hand as a single form. I ^{1 For} other applications it is necessary to feed the paper mechanically, whereby the paper supply is usual as a roll or in zigzag folds (Leporello). In many cases it is also required that several differently dimensioned and / or colored paper supplies are kept in a writing unit and can be controlled. Finally, it is also required that paper that has been inserted either manually or by machine can be written on. This task is usually fulfilled in separate paper tracks lying next to one another (perpendicular to FIG. 1). This makes writing works considerably wider and more expensive. It is therefore endeavored to write paper fed by hand as well as machine fed paper in the same paper path. Such a solution is already known, which, however, requires considerable effort in flaps, pawls, timing disks and tractors (DE-OS 27 15 428).

According to the invention, a machine paper feed is used instead (Paper dispenser) in the previously described Integrated writing mechanism, that of rocker 22 with counter roller

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and actuating magnet 24 as well as the wedge piece 11 already described at the beginning and the one on the right, in the previously explained writing process remained unused friction roller 6. The roller or

o5 paper 25 held in front of it in fan-fold form runs from the right in the paper path 5 and is there in a known manner is pressed against the wedge 11 by the brake pad 26 seated in the rocker 22. In this rocker position comes the friction roller 6 protruding into the paper path 5 is still not in contact with the paper 25. Only after actuation of the magnet 24 tilts the rocker 22 counterclockwise in such a way that that the counter roller 23 presses the paper 25 against the friction roller 6 and at the same time the brake pad 26 from the wedge 11 lifts off and thus releases the paper 25. if at the same time the motor 1o starts so that the friction rollers 6 clockwise, then the paper 25 runs from the paper path 5 into the paper path 4 and can there as already explained in needle writing and / or magnetic writing, single or multi-line, in longitudinal writing or written in cross-writing. If several paper supplies are required in a writing unit, several paper dispensers can be arranged next to one another, which cooperate with the same friction roller 6 and the same wedge 11. The selection of the special paper supply takes place by activating the special actuating magnet 24.

If the paper supply is available as a form, so are despite precisely programmed line and column tabs Error total tolerances inevitably resulting from Paper stretching, slippage and friction roller abrasion originate can. In this case, the paper must be provided with control holes, which are always in the same position for form printing to have. For this purpose, a continuous light-

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rod 27 attached, which in the paper path 5 a narrow strips of light cast. Opposite sits in the rocker 22 a phototransistor 28, which through the paper is covered, unless there is a control hole in the paper 25. Then the phototransistor 28 gives a signal from, that for the form-correct synchronization of the column tabs, in the case of lengthwise writing or the line tabs is used in the case of the cross script.

After the writing process, the machine-fed paper 25 must be automatically cut off. For this must in the control program a cutting tab can be set in the form of the cycle number that corresponds to the one to be cut Edge in the paper 25 transported out to the left to the cutting edge 29 of the rotary knife 3o and the counter knife 31 brings. When this number of cycles is reached, the motor 1o is stopped and the rotary knife 3o via rocker arm 32, Crank rod 33, crank 34 and knife motor 35 moved. To When the cutting is completed, the motor Io is started in reverse, so that the paper 25 runs back to the right and after reaching a constant number of cycles by stopping of the motor 1o stops. This cycle number results from the length in the paper tracks 4 and 5 between the cutting edge 29 and a point about 5 millimeters to the left in front of the brake pad 26. This point must be such that the paper 25 on the one hand still securely grips the brake pad 26 is, on the other hand, but no longer protrudes into the paper path 4, whereby the free movement is manually pre-inserted Individual forms in. The paper path 4 would be hindered. When the motor 1o stops, the actuating magnet is also activated 24 switched off so that the brake pad 26 clamp the paper on the wedge 11 can. After that this is

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ORIGINAL INSPECTED

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Writing unit free again for a new writing process, be it on manually inserted paper or on paper fed in by machine.

The advantages of the writing unit according to the invention are that it meets all of the requirements mentioned above becomes, and that it is universal by repositioning or omitting assemblies with a minimum of parts and Build volume is to be used.

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Claims (1)

Licentia Patent-Verwaltungs-GmbH NE2-B / Öh / bv Theodor-Stern-Kai 1 B-N 79/7 D-6ooo Frankfurt 7ο Claims 1. Electronically controlled writing unit in a modular design for paper fed by hand or machine, characterized in that, a) that two angled paper tracks voro5 are seen b) that at least one writing device is arranged on one track, c) that three identical friction rollers driven together in the same direction are provided for the paper transport are, of which two are arranged on one and the third on the other paper path are. 2. Writing mechanism according to claim 1, characterized in that a counter-roller can be switched to the third friction roller. - 2 0 ^ -042 / 0603 - 2 - B-N 79/7 3 "writing unit" according to claims 1 and 2, characterized in that a writing device for visually readable writing and a writing device for machine-readable writing are provided for simultaneous operation, o5 4 ·· writing mechanism according to claims 1 to 3 » characterized in that a pulse on the ring gear of the gear wheel for the paper transport as well as for the transverse transport of the needle head can be removed per column of a needle character and / or per bit of the magnetic writing. 5 · Writing mechanism according to claims 1 to 4-, characterized in that the writing device can be rotated by 90 in order to convert from longitudinal to transverse writing. 6. Writing unit according to claims 1 to 5i, characterized in that the supply lines of the motors and the light barriers can be interchanged when converting from longitudinal writing to transverse writing to use the same writing program. _ 3 _
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