DE2456014A1 - DEVICE FOR PRINTING CHARACTERS - Google Patents

Description

Patent attorneys

: Dipl.-Ing. W.Beyer::; ";

; - · Dipl.-Wirtsch.-Ing. B. Jochem '

Frankfurt am Mairi '. . . .Staufenstrasse 36

In matters:

FACIT AKTIEBOLAG; ■ ■ ;.
S-597 oo Rtvidaberg / Sweden

Device for printing characters. . ^:

The invention relates to a device for printing characters on a recording medium with two the printing elements longitudinally displaced on both sides of the recording medium Slidable holders, which are rigidly coupled to one another in the direction of displacement, the recording medium being perpendicular zur'Verschiebungsrichtung the brackets is movable.

In known devices of this type, the one holder be provided with a print hammer and the other bracket with a rotating wheel that cooperates with the print hammer and has helical "ridges or ridges. When a recording medium such as a pressure sensitive Paper is placed between these 'printing elements, a point is created on the paper when the print hammer hits one of the Ribs or combs. If the pressure element is relative to are exactly adjusted to each other can be formed by the points Characters, for example letters, are generated when the print hammer is in accordance with a precisely specified. Schedule is operated. When the characters are generated the holders are together across the recording medium bev / egt. One. The condition for achieving the desired text is that the holders are firmly connected to one another. In the known devices, this condition is thereby

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it is sufficient that the colders are connected to one another by a common carrier are connected »This means that a recording medium from, for example, endless breading cannot be used in the known printing devices. Instead of this "These devices have a holder in which the recording medium can be used in the form of a role. When the role is used up, a new role must be used will.

In the case of the printing devices mentioned at the outset, it is also desirable to be able to use an endless recording medium. Since the requirement must be met that the Pia lter are firmly connected to each other, is a satisfactory solution this problem has not yet been identified. For example, if the holder by chains and sprockets or the like. are driven, the wear will relatively soon cause incorrect settings of the holder to each other, so that the printed text becomes incorrect.

/ Aifgabe of the invention is to provide a printing device of the initially to create mentioned type, with v / elcher the holders are immovable to each other, while at the same time an endless recording medium can be used. According to the invention this object is achieved in that the brackets on tapes or the like are arranged, the ends of which are connected in pairs by coupling pieces, one of which has a Coupling with the second, like a yoke to the other Band ends articulated coupling piece is pivotally connected.

Further "features for the advantageous embodiment of the invention and the advantages that can be achieved thereby emerge from the following description of one shown in the drawing Embodiment. Show it:

1 shows a printing device of known design,

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Fig. 2 "shows a printing device according to the invention and

Fig. 3 the measures according to the invention ^ with which the drive members the printing device are driven immovably with respect to one another.

In all figures, the printing device according to the invention is only schematically illustrated in a perspective view and only with those "parts" that are necessary to explain the invention are.

In the known device according to FIG. 1, there are two holders 1o and 11- united by a common carrier 12 in which a roll 13 of a recording medium such as a pressure-sensitive paper 14 can be inserted. The carrier 12 with the holders 1 o and 11 can move forward and moved backwards transversely to the direction of the breading 14 by means of drive members not shown.

The holder 10 has a print hammer 15 and the holder 11 has a rotating wheel 16 with ribs or rims 17 as described above. The paper 14 is at all times between your print hammer 15 and the ribs or combs 17. During the movement of the holders over As has also already been described, characters are generated on the paper 14. When a line of characters has been written, the paper 14 is indexed by one line perpendicular to the direction of movement of the holder. " ^: "'. ·.

In the exemplary embodiment of the invention shown in FIG. 2, two holders 18 and 19 with a pressure arm 20 and a rotating so-called helical gear 21 are provided. The latter is attached to a shaft 22 and has ribs 23 which cooperate with the print hammer 2o. A recording medium such as pressure-sensitive paper 24 passes between the print hammer and the screw wheel and it can

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on paper in a corresponding manner, _f .as described above, characters can be produced. The holder 18 has a support in the form of a plate 25, and the holder 19 is carried by a corresponding plate 26. By means of the plates 25, 26, the colds are attached to drive members which, in this exemplary embodiment, are in the form of belts 27 and 28. It is also possible to use ropes or rods instead of straps, the latter preferably being flexible. In the embodiment shown, the bands are connected to the plates by screws 29.

According to the invention, the bands 27 and 28 are relative to one another immovable and displaceable together in their longitudinal direction in such a way that the holders 18 and 19 in the transverse direction to Paper 24 are moved. When a character line is produced by the printing elements, the paper 24 is increased by one Row is indexed substantially perpendicular to the direction of movement of the straps and holders. For this purpose is a Guide 3o for the paper between the belts 27 and 28 is provided. As FIG. 3 also shows, there is a corresponding guide 31 on the opposite edge of the paper. on in this way the paper is movably held between the belts 27 and 28 and the printing elements on the holders.

Fig. 3 illustrates in more detail the manner in which the ligaments and 28 are arranged to be immovable relative to each other. In the exemplary embodiment, the bands run over circumferential rollers 32 and 33, the ends 34 and 35 of the bands being rigidly connected to one another by means of a coupling plate 36 which is pivotably connected to a yoke 33 via a coupling 37. The yoke 38 is in turn pivoted to the other ends 39 and 40 of the belts in such a way that it can pivot slightly in relation to the belt ends. This allows different lengths of the belts 27 and 23 to be balanced out when the belts run over the rollers 32 and 33. If there are belts on the pulleys,

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the coupling plate 36 ensures an immovable relative connection between the ligaments .-- A possible slip or Carriage of the belts on the pulleys 32 and 33 is without Meaning, and neither are wear and tear, cooling, or the like Heating have some influence, v / o the belts 27 and be brushed or lengthened equally. Holders 18 and 19 verden-therefore always exactly in relation to each other the bands 27 and 23 must be set.

As shown in FIG. 3, the guides 3o and 31 have such a shape that the paper 24 between the ribbons only on the side of a plane containing the axes of the pulleys and on which the holders are located.

The details that are not shown in the schematic figures can be of conventional construction. For example can either, the pulley. 32 and the pulley 33, driven by a stepper motor, and the advance of the paper 24 at right angles to the direction of movement the holder can also be made by a stepping motor. To the holder 18 and 19 in a predetermined relative distance perpendicular to the bands 27 and To hold, guides, not shown, can be provided along which the holders move.

Patent claims /

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El FF 114 / 11/26/1974

Claims (4)

Patent claims 1 . j Device for printing characters on a recording medium with two the pressure elements on both sides of the recording means of load-bearing longitudinally displaceable brackets, which are rigidly coupled to one another in the direction of displacement with the recording medium perpendicular to the displacement direction of the brackets is movable, d u r c h g ο indicates that the brackets (18, 19) are on Blindem (27, 23) or the like are arranged, the ends connected in pairs by coupling pieces (3 6, - 38) are, of which one (36) rigidly unites the tape ends there and about a. Coupling (37) with the second coupling piece (33) articulated in the manner of a yoke on the other belt ends is pivotally connected. 2. Device according to claim 1, el a d u r c h g e k e η η-records, that the belts (27, 23) are guided over two oil rings (32, 33) with the formation of two endless loops, where the; Brackets (18, 19) on one side of a die Axes dor guide rollers (32, 33) containing plane arranged and the recording means (24) are only on this side runs between the bands (27, 28). 3. Performing according to claim 2, characterized in that that the. For example, from pressure-sensitive Breading existing recording means (24) in between the belts (27, 23) arranged guides (3o, 31) is guided. 4. Device according to one of the preceding claims, characterized in that · the one holder (19) a rotating screw gear (21) -.lit helical cams (23) and the other holder (18 ) carries a pressure hammer (2o) cooperating with c.an combs, wol ei the recording means (24) is arranged so that it between the screw wheel (21) and the print hammer (2o) hinclurohldult. _E i ppi u / 26. ,1. , 974 509825/0721 "" oma "". Blank page