DD201285A5 - ROW PRINTER, ESPECIALLY FOR ELECTRONIC CASH REGISTERS - Google Patents

Abstract

The invention relates to a line printer, in particular for electronic cash registers, in which the pressure roller (8) cooperating with a Druckrad (1) under the drive by a cam disk shaft (2) by means of a specially designed lever gear against the upper edge of the Druckrad (1) pivoted set print line, then unrolled by the height of the print line along this at the Druckradwalze (1) and then lifted off of this and returned to the initial position. Fig. 1

Description

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Line printers, especially for electronic cash registers

Field of application of the invention:

The invention relates to a line printer, in particular for electronic cash registers, with a Typenradwalze and a- with this cooperating rotatable pressure roller, which is mounted on a, actuated by means of a drivable Uockenscheibenwelle lever mechanism.

Although the line printer according to the invention is intended primarily for electronic cash registers, it can also be used in mechanical cash registers or other data processing systems.

Characteristic of the known technical solutions:

In a known printing device (DE-AS 2 414 023), the pressure roller is struck against the type carrier, so that the guided between the pressure roller and the type carrier recording paper is printed by the respective type of printing. By means of a pawl is rotated each time by a certain angle of rotation, as soon as it has been lifted from the type handle again. ·

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Aim of the invention;

With the invention, a structurally particularly simple and very reliable line printer is to be provided.

Explanation of the essence of the invention;

With the invention, the problem is solved, ..einen-line printer of the aforementioned. To provide a type in which the pressure roller for the printing process against the Druckrad- moves roller, then rolled on the Druckradsprze on the set Drucktypenzeile, and. is then lifted from the Typenradwalze and moved back to its original position.

Thereby, the types of printing on the Typenradwalze convexly curved or preferably substantially, be formed., And the pressure roller is, by.Your rolling on the Typenradwalze or, between the pressure roller, and the Typenradwalze against this, pressed, to be printed paper strips at each printing by a, determined by the height of the print line rotation angle rotated so that they at the next printing with one, another. Area of its circumference is pressed against the Druckradwalze.

According to the invention, in a line printer with the features mentioned, the pressure roller senk.zur roller axis against the force of a return spring resiliently mounted in a bracket which is pivotally mounted on the one arm of a first two-armed angle lever whose other arm with a first cam of Cam disk shaft for pivoting the angle lever and the bracket with the pressure roller to the Typenradwalze cooperates against the force of a return spring. An extension rod is hinged at one end of the bracket, the other end at the other end

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on which one arm of a second two-armed angle lever is angeienkt whose other arm cooperates with a second cam disc of the cam disk shaft for pivoting the second angle lever for pivoting the bracket with the pressure roller pressed against the pen roller down against the force of a return spring,

Here are the cams of the cam disk shaft, which performs a full revolution for each printing and. each cooperating with the cams angle lever is designed such that for each printing first the first angle lever is pivoted with the pressure roller against the Druckradwalze and then the bracket is pulled with the pressure roller on the drawbar and the second angle lever on the Druckrad down under pressure, whereupon the first bell crank of the associated cam disc for pivoting back into the starting position under the force of,

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Return spring is released. At the same time or briefly, the second angle lever is released from the associated second cam for pivoting back the bracket with the pressure roller up under the force of the associated return spring, so that the lever mechanism then assumes the starting position again _o

Characterized in that, according to the invention, the pressure roller is mounted resiliently against the force perpendicular to the pressure roller axis against spring force, it can during the pivotal movement of the bracket, the pressure roller supporting end while a. Circular path, controlled by the outer shape of the pressure types resiliently evade, where it is unrolled in the downward pivotal movement of the bracket, so that its axis, for example,. along a straight line «, then it is under the force of the return spring again

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moved back to their original position. The resilient mounting of the pressure roller in the bracket is preferably achieved in that the pressure roller is mounted with their journal each in a bracket formed on the bearing recess, which has a larger diameter than the journal, on an angular two-armed, pivotally supported on the bracket holding lever resting on one arm and held pressed against the upper edge of the bearing recess under the force of acting on the other arm of the holding lever Bückstellfeder. In the displacement of the pressure roller thus their axle journals are rolled on the upper edge of the bearing recess or slidably moved on this, so that. they are printed in accordance with .Kreisbogenform the edge of the bearing recess slightly downwards, and thereby the retaining lever on which they rest, is slightly pivoted against the force of the return spring. At the end of the printing process, the journals with the pressure roller under. the force of the return spring is restored to its original position «'

Although it is possible for the aforementioned three. Return springs each to use separate springs, these are formed in a preferred embodiment of the invention all by the return spring, which engages the pressure roller resilient holding lever.

Embodiment;

The invention will be explained in more detail below with reference to a preferred embodiment, which is apparent in its details from the drawings. In the drawings show:

1 is an overall perspective view of a line printer according to the invention,

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Pig, 2 in side view of the pressure roller of the line printer according to FIG, 1 having! EIL thereof in the starting position of the pressure roller before each printing operation,

Pig. 3 is a side view of the part of the line printer of FIG. 2, but in a position in which the pressure roller is pivoted at the beginning of the printing operation against the type carrier roller.

In the case of the line printer apparent from FIG. 1, a type wheel roller 1 is provided of a plurality of counter-rotating type wheels, with which a width substantially equal to the width of the printing wheel roller 1 has. Printing roller 8 for line by line printing a paper strip (not shown), which between the Typenradwalze 1 and. the pressure roller 8 optionally passes together with a color carrier, cooperates upon the arrival of a pressure signal, which is given after the adjustment of the type wheels of the type wheel 1 to the desired line image. The type wheels of the Typenradwalze 1 are polygonal and have a plurality of segmentförmi ge n pressure types, one of which is shown schematically at 21 in Figs. 2 and 3. In this embodiment, the printing types 21 are substantially trapezoidal in cross-section with the shorter trapezoidal side facing the printing roll and producing the printed image upon printing

For each printing operation, the pressure roller 8 is to be moved from the exit point shown in FIG. 2 against the type wheel 1 to the position of FIG. 3, in which it is pressed against the upper edge of the pressure type line formed by the set types 21, then to to be rolled down over the height of the print type line. For this movement of the pressure roller 8, this is obtained from the position according to FIG. 2.

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speaking the arrows in Fig. 3, first pivoted forward to the pressure types 21 and then pulled down, whereupon it is returned to its initial position shown in FIG.

The rotatable pressure roller 8 is mounted with its journal each in a circular arc, extending bearing recess 18 whose diameter is larger than the diameter of the Achszapfeη 20. In the from Figs. 2 and. 3 apparent embodiment, the diameter der'Lagerausnehmungen by about half the diameter of the axle journal 20 is greater than the diameter of the pin 20. _The bearing recesses are provided on the one end face of a generally u-shaped bracket 5 is formed "The pressure roller. 8 is in the bearing recesses by means of two, each pivotally supported on one of the legs of the bracket 5. Holding lever 6 is held, which are each formed as a two-armed angle lever and on one arm 19, the axle journals 20 of the pressure roller 8 rest. At dem.arm arm of the holding lever 6 engages a tension spring formed as a return spring 7, so that the journal 20 of the pressure roller 8 are printed by the arms 1-9 of the retaining lever 6 against the upper sand of the associated bearing recess 19. Der.Bügel 5 is pivotally mounted at its end facing away from the pressure roller 8 at two gleich.ausgebilden angle levers 4, each to. a common fixed axis 14 are pivotable to them and carry at their other, each lever a roller 15. The roller 15 each cooperate with a cam 3. The cams 3 are seated on a fixedly mounted camshaft shaft 2, which is rotated by a full revolution (not shown) for each printing operation by a drive motor.

In addition, each of the arms of the bracket 5 has one end ·

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of two tie rods 12 of equal design at a distance from the anvil axis of the bow 5 to the handle! Lifting into 4 hinged The other end of the tie rods is in each case on the one arm. a pair of the same, trained second angle levers 11 hinged, which in turn are pivotable about a fixed axis 13 which is parallel to the axis 14 of the angle lever 4 at a distance from this. The other lever arms of the Winke1 lever 11 each cooperate with a second cam 9 on the cam disk shaft 2. Due to the apparent from Fig. 1 overall training of the lever mechanism of the two act on the holding levers 6 return springs ,? also the angle lever · 4 and 11 acted upon so that 'they are printed against the cams and follow their Survenform. At the same time by means of the return springs 7 and the bracket 5 in his from Pig. 2 apparent starting position drawn «

Thus, during each printing operation, the pressure roller 8 is held in the position shown in FIGS. 1 and 2. Upon rotation of the camshaft shaft 2 in the arrow direction due to the pressure signal first reaches the cam of the cams 3 in singing engagement with the associated roller 15 of the angle lever 4, so that iait of these the bracket 5; the pressure roller 8 is printed to the front of the print wheel 1 in the direction shown in FIG. 3 position. In this pivot position, the angle lever 4 are held on the cam of the cams 3, while the cam of the cams 9 siit the angle lever 11 engages, causing it to pivot about the stationary axis 13 down and therefore on the pull rod 12 of the bracket 5 with the Pressure roller 8 is pivoted about the Anienkachse • the bracket 5 at the angle levers 4 down. Thereby, the pressure roller 8 on the printing type 21 corresponding to the arrow entered in Pig · 3 on the pressure roller 8

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unrolled. As can be seen from FIGS. 2 and 3 a of the comparison, the position of the black point on the axle journal of the pressure roller 8, this is displaceable in its bearing recess on the bracket 5, so that, despite the pivotal movement of the bracket on a circular path during its rolling movement, While it is pulled by the tie rod 12 down, the rectilinear surfaces of the pressure types 21 can follow .. In this evasive movement, the axis of the pressure roller 8 is lowered relative to the bracket 5 against the force of the retaining levers 6 acting on the return springs 7.

Once the squat of the cams 3 is disengaged from the associated roller 15, the angle levers 4 under the tension of the holding lever 6 of the. Pressure roller 8 attacking return spring 7 um. stationary axle 14 pivoted back so that the pressure roller 8 is lifted from the Typenradwaize 1 again. At the same time., The pressure roller 8 is raised with its journals 20 under the train of return springs 7 of the holding levers 6 again in the apparent from Fig. 2 starting position relative to the bracket 5 »Then the cam of the squib discs 9 except singing engagement with the · angle levers eleventh , so that - also under the train of the return spring 7 - the bracket 5 is pivoted about its pivot point on the angle levers Λ upwards, so that thereby the pressure roller 8 is pivoted back to the starting position in Fig, 2 up _o

Claims (3)

- 233274 4 Srfindungsansprueh: 1. Zeileaarucker, in particular for electronic cash registers, with a Typenradwalze and cooperating with this rotatable pressure roller which is mounted on an actuatable by means of a drivable cam disk shaft lever mechanism, characterized in that the pressure roller (8) perpendicular to the. Roller axle against the force of a Hückste11feder (7) is resiliently mounted in a bracket (5) which on the. an arm of a first two-armed Winielhebels (4 ·) is pivotally mounted, the other arm with a first cam plate (3) of the cam disk shaft (2) for pivoting the angle lever (A-) and the bracket (5) with the pressure roller (8 ) to the Druckradwalze (1) against the force of a return spring (7) cooperates, and in that on the bracket (5) a tie rod (12) is articulated with its one end, with its other end to the one arm .a second articulated with two-armed angle lever (11), the other arm with a second cam disc (9) of the cam disc shaft (2) for pivoting the bracket (5) with the pressure roller (1) pressed on the pressure roller (8) down against the force of a Return spring (7) cooperates « 2 * line printer, according to item 1, characterized in that the pressure roller (8) is mounted with its journal (20) in each of the bracket (5) formed bearing recess (18) of larger diameter than that of the journal (20) on a lug-shaped two-armed, on the bracket (5) pivotally supported retaining lever (6) on one arm (19) and rest under the force of the other arm of the holding lever (6) acting on the return spring (7) against the. pressed on the upper edge of the bearing recess (18). 233274 4 3 · Row retour after point 1 and 2 ,. characterized in that the return spring (7) acting on the holding lever (6) is at the same time the return spring acting on the first angle lever (4 ·) and the restoring spring acting on the bar (5) and the second angle lever (11) , - For this 2 sheets drawings -