JPH0416359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically writing characters, symbols, etc. on drawings.

2. Description of the Related Art Devices for automatically writing characters, symbols, etc. on drawings are already known, in which a writing instrument is attached to a carriage that can move over the drawings.

West German Patent Application No. 2724855 and Japanese Unexamined Patent Publication No. 54-2829 disclose a device for automatically writing alphanumeric characters, numbers, symbols, etc. on drawings, which is equipped with a controllable writing device. , which has a carriage that can run over the drawing board and a control unit that is connected to the carriage via flexible conductors, which can freely pivot about an axis perpendicular to the drawing board and which are angular to each other. The writing instrument of the writing device is held at the mutually pivoted ends of two arms arranged in the carriage in the form of a frame, the length of each of which arms can be varied by means of a feed spindle. It has become like this,
A version is disclosed in which the feed spindle is driven by an electric motor which is controllable by a program stored in a control unit and which is selectable by a program selection device.

Further, according to West German Patent Application No. 2809480, a computer, an input key field for numerical information, a storage device, a writing device, a drive device for moving the writing device, and a storage device are disclosed. A drawing instrument in which the data retrieved from is provided with one or more motors to independently move it on the drafting table, and a motor that moves the drafting instrument based on data retrieved from a storage device, such as the X and Y coordinates of a curve, and a motor that moves the drafting instrument independently on the drawing table. Types in which the drive for moving the device is controlled are known.

Furthermore, from German Patent Application No. 22 30 671 a drawing instrument is known which has a writing device consisting of a matrix needle printer, which is arranged on the underside of a movable carriage. The carriage of this drafting device is moved over the drawing by hand, and the feeding distance is measured by wheels or rollers that move over the drawing, and after a predetermined feeding distance, characters and symbols are printed. Instructions are given.

These previously known drafting instruments, whether equipped with manually, mechanically or electrically driven carriages, suffer from a certain degree of slippage in the wheels that roll in a frictional connection over the drawing surface, resulting in letters and letters. It has the disadvantage that the spacing between symbols becomes irregular and the characters and symbols are distorted. In addition, at present, it is not possible to adapt the pressure of the writing instrument on the drawing to the writing instrument being used, such as felt-tip pens and similar instruments, so the written characters and symbols may become scratched or blurred. cannot be completely avoided, and the use of conventional drawing instruments is restricted to a limited number of characters and symbols.

The object of the invention is to significantly increase the quality of the work achieved with a device of the type mentioned, namely to reduce or completely avoid wheel slip, to vary the writing pressure, and to , adjusting the writing pressure to suit writing instruments with different writing line thicknesses, making the device and even the carriage smaller and lighter, and making it possible to write any symbols and characters continuously and in any size. The goal is to make sure that

An object of the present invention is to provide a device for automatically writing characters, symbols, etc. on a drawing, which is provided with a carriage that can be moved over the drawing using rollers or wheels driven by a drive motor, and the carriage is controllable. A writing instrument holder holding a writing instrument of the writing instrument is held in a pivot joint of two threaded spindles pivoted at an angle to each other and driven by a hollow shaft motor. The writing device has a writing pressure adjustment device, and in order to configure the writing pressure adjustment device, a hollow shaft motor of a screw spindle is attached to a leaf spring so as to be pivotable about an axis perpendicular to the drawing. The leaf spring is fixed to a rotating body supported by an eccentric plate of a DC motor, and the rotating body is rotated by the action of the eccentric plate, and the leaf spring is raised and lowered and held by the writing instrument holder. The problem was solved in that the writing instrument was raised and lowered, and the rollers or wheels of the carriage were provided with teeth and engaged with a ruler with a rack placed on the drawing board.

Advantageous embodiments of the invention are described in claim 2.

The invention will now be explained with reference to the drawings.

The carriage 1 with the keyboard is equipped with toothed wheels or rollers 11 (FIG. 1). The wheels or rollers 11 mesh with the ratcheted ruler 2 with teeth. Reference numeral 3 indicates a writing instrument holder.

As shown in FIG. 2, the writing instrument holder 3 for holding a writing instrument is attached to two threaded spindles 7, which are designed as threaded spindles and are arranged at an angle to each other. The screw spindle 7 is adapted to be driven by a hollow shaft motor 6. This hollow shaft motor 6 is supported by a leaf spring 5 so as to be able to pivot about an axis perpendicular to the drawing. By suitably controlling the hollow shaft motor 6, the writing instrument holder 3 is moved via the screw spindle 7, whereby the desired characters/symbols are drawn on the drawing using the writing instrument. .

A writing pressure adjusting device 10 is disposed within the carriage 1 in order to adjust the writing pressure by raising and lowering the writing instrument holder 3 relative to the drawing. Pen pressure adjustment device 10
is a rotating body 4 and a leaf spring 5 fixed to the rotating body 4.
and a DC motor 8 having an eccentric plate 9 that supports the rotating body 4. The eccentric movement of the eccentric plate 9 by the DC motor 8 is transmitted to the leaf spring 9 as a vertical movement via the rotating body 4, and this vertical movement finally causes the writing instrument holder 3 to move up and down.

The carriage 1 is controlled by a control unit (not shown) in which a program is stored. This program is called by the keyboard on carriage 1. For example, control of a writing instrument for drawing a character is selected, and a command to drive the wheels of a carriage is issued. After writing a letter/symbol, the carriage is brought to the position where the next letter/symbol is to be written. No slipping occurs when the carriage runs because the toothed wheels mesh with the ratchets. The carriage is stopped while the symbols and characters are being written, so the characters and symbols drawn will not blur.

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
FIG. 1 is a perspective view of the drafting instrument of the present invention, and FIG. 2 is a top view of the inside of the carriage. 1... Carriage, 2... Ruler with rack, 3... Writing instrument holder, 4... Swivel body, 5... Leaf spring, 6... Hollow shaft motor, 7... Screw spindle, 8... DC motor, 9... Eccentric plate, 10... Pen Pressure adjustment device, 11...wheel or roller, 12...scale.

Claims (1)

[Scope of Claims] 1. In a device for automatically writing characters, symbols, etc. on a drawing, there is provided a carriage 1 that can be moved over the drawing using rollers or wheels 11 driven by a drive motor.
are provided, the carriage 1 holds a controllable writing device, and a writing instrument holder 3 for holding the writing instrument of the writing device is driven by a hollow shaft motor 6 and pivoted at an angle to each other. The writing device has a writing pressure adjustment device 10, and the writing device has a writing pressure adjustment device 10.
A hollow shaft motor 6 of a threaded spindle 7 is mounted on the leaf spring 5 so as to be able to pivot about an axis perpendicular to the drawing.
is the rotating body 4 supported by the eccentric plate 9 of the DC motor 8.
The rotating body 4 is rotated by the action of an eccentric plate 9, and the leaf spring 5 is raised and lowered to raise and lower the writing instrument held in the writing implement holder 3. A device for automatically writing characters, symbols, etc. on a drawing, characterized in that a roller or wheel 11 is provided with teeth and meshes with a ruler 2 with a rack placed on the drawing. 2. A device for automatically writing characters, symbols, etc. on a drawing as claimed in claim 1, wherein the ruler 2 with a rack is provided with a scale 12 to facilitate measurement.