Automatic drawing instrument

(42) Date of commencement of the patent: 15.10.1989 (45) Date of issue: 25. 4.1990

<td>(30) Priority:</td><td>(73) Patent owner:</td>

<td>12. 2.1981 DE 3104962 claims.</td><td>HERO KURT D-7218 TROSSING (DE).</td>

<td>(56) Documents:</td><td></td>

<td>DE-0S2724855 DE-AS1194735 DE-AS2230671 DE-AS2809480. US PS3753384</td><td></td>

(54) AUTOMATIC WORKING DEVICE (57) An automatic drawing machine consists of a trolley (1) equipped with wheels or castors and a swivel unit (4, 5) rotatable about an axis parallel to the writing plane, on which the pen holder (3) supporting spindles (7) with motors (6) are attached. It is intended in that the pivoting unit (4, 5) is equipped with a DC motor (8) with eccentric disc (9) for raising and lowering the pen holder (3), that the motors are designed as hollow shaft motors (6) and the spindles as threaded spindles (7), and that the wheels or rollers (11) of the carriage (1) have a toothing and mesh in a rack ruler (2) resting on the writing plane, which is provided with a scale (12) to facilitate the dimensioning.

CO

AT 390 400

<img file="AT390400B_D0001.tif" />

DYRoraaiß

No. 390 400

The invention relates to an automatic drawing device with a equipped with wheels or rollers, movable on the writing plane carriage, with a about an axis parallel to the writing plane rotatable pivoting unit on which the pen holder carrying spindles are mounted with motors.

Devices for automatically inscribing drawings in which the pen is attached to a carriage which can be moved on the writing plane are known.

Thus, DE-OS 27 24 855 describes a device for automatic labeling of drawings with alphanumeric characters, drawing symbols u. like. with a carriage that can be moved on the drawing, who carries a controllable writing device, and with a control unit, which is connected via flexible lines to the car, which is characterized that the writing device has a pen, which is held at the hingedly connected ends of two arms, freely pivotable about an axis perpendicular to the plane of the drawing, are arranged at an angle to each other on the car, that the length of the arms is variable by means of a feed screw and that the feed screws are each driven by electric motors, which can be selected by means of a program selection device, programs stored in the control unit are controllable.

From DE-AS 28 09 480 a drawing device is known with a computer, with an input keypad for numerical information, one or more stores, a writing device and drive means for moving the writing device and control devices, the data retrieved from the memory control the drive direction of the writing device, which is characterized that the computer is a calculator and that one or more motors are provided for independent of a reference device and independent movement of the drawing device by wheels or tracks on the desk pad, the controllers having data retrieved from the memory, z. Β. X and Y coordinates of a curve controlling motors for moving the drawing device and the drive means for moving the writing device.

DE-AS 22 30 671 describes a device with a writing device of a matrix dot matrix printer, which is arranged on the underside of a movable carriage. This car is moved by hand on the writing surface, which measured by running on the drawing wheels of the feed and the commands for the character print done after predetermined feed distances.

Finally, from DE-PS 11 94 735 a device for holding and guiding of dimensioning and labeling machines on drawing boards u. like. known, at least one mounting rail extending in the longitudinal direction of the drawing board parallel to the plane of the drawing, at least one retaining rail extending at right angles to the support rail and at least one extending at right angles to the support rail and parallel to the support rail, the presetting and labeling machine bearing guide rail are arranged and the support rail is adjustably connected via a sliding head with the support rail and the guide rail via a sliding head with the support rail, which is characterized that the mounting rail has a toothing, which corresponds to the letter spacing of the dimensioning and labeling machine and the holding rail is provided with a the line spacing of the dimensioning and labeling machine corresponding toothing, while the sliding heads have cooperating with the teeth of the rails cushioned pawl.

All of these previously known drawing devices, no matter whether equipped by means of a manually, mechanically or electrically movable on the writing plane car, have the disadvantage that a certain slip of the friction running on the drawing wheels occurs, resulting in uneven character spacing and Zeichenverzeirungen can. Even a blur of the drawing can not be excluded because it is not possible at the moment, the writing pressure of the pen on the drawing the respectively used pins, such as felt pens u. like. adapt, so that the application of the previously known devices is limited to a limited number of types or symbols.

The object of the present invention is to improve the writing quality of such devices in a decisive manner, d. H. to avoid or exclude the slip of the wheels running on the writing plane and to allow easy lifting and lowering of the pens used in each case, the device and the movable carriage be sized small and light and the labeling with any drawing and symbols continuously and in any Size should allow.

This object is achieved in a device of the type mentioned in, that the swivel unit is equipped with a DC motor with eccentric disc for raising and lowering the pen holder, that the motors are designed as hollow shaft motors and the spindles as threaded spindles, and that the wheels or rollers of the carriage have a toothing and mesh in a rack ruler resting on the writing plane, which is scaled to facilitate the dimensioning.

An embodiment of the invention will be described with reference to the drawing, in which Fig. 1 is a perspective view of the writing instrument and Fig. 2 is a sectional view from above through the carriage.

The carriage (1) with keyboard (Fig. 1) is equipped with toothed wheels or rollers (11) which mesh on the rack ruler (2) with scale (12). With (3) the pen holder is designated.

In Fig. 2, the pivoting means (4) with leaf springs (5) arranged thereon hollow shaft motors (6) with threaded spindles (7) which carry the Schreibstifthalterung (3). The DC motor (8) with its eccentric disc (9) serves to raise and lower the pivot unit (10).

-2Nr. 390 400

The carriage is controlled by a control unit in which the programs are stored. The programs can be called up from the keypad on the cart. Thus, for example, the control of the pen for the display of a character can be selected and a command given for driving the wheels of the carriage. After writing, the carriage continues by one character pitch and takes the position required to write the next character. Slip of the carriage during the procedure is excluded because the toothed wheels mesh in the rack ruler. While the characters are being written, the carriage stops, so that distortion of the characters can not occur.