JPH0311919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in an automatic drafting machine that performs drafting based on an X-Y coordinate system.

Generally, an automatic drafting machine that performs drafting based on an X-Y coordinate system has a rectangular drafting board and two X rails installed parallel to each other along both sides of the drafting board in the longitudinal direction. , two X cursors facing each other and driven to travel along these two X rails by drive sources such as electric motors,
A Y rail whose end portions are fixed to both X cursors and is orthogonal to both X rails, a Y cursor which is also driven by a drive source such as an electric motor along this Y rail, and a Y rail which is attached to this Y cursor and is an image sensor. It consists of a holder that holds the wire, a winding part provided near the front end of the drawing board, and a feeding part also provided near the rear end of the drawing board. By rotationally driving with a drive source, a long drafting paper wound in a roll is fed into the top surface of the drawing board around the feeding roller of the feeding section.
Stop the part of this drafting paper to be drawn on the top surface of this drawing board, and then press both X cursors and Y
Drawing is performed by driving the cursor to travel according to a predetermined program and controlling the position of the Y cursor, to which a holder for holding a drawing tool is attached, with respect to the X-Y coordinate system. In such things,
An effective range in which drawing can be made is defined on the drawing board based on the travel limits of both X cursors in the feeding direction of the drawing paper, and a point on the leading edge of this effective range is set as the origin, and drawings are performed sequentially from this leading edge. When the Y cursor reaches the trailing edge of this effective range, the Y cursor can be returned to its origin and the next drafting section of the drafting paper can be sent to the top of the drawing board to continue drafting. It will be done.

However, in conventional automatic drawing machines such as this, when the part of the drawing paper where the next drawing is to be made is fed onto the top surface of the drawing board, the final part of the previous drawing is transferred to the drawing set on the drawing board. It is extremely difficult to stop accurately at the leading edge of the possible effective range, and therefore, if you continue drawing, the lines may overlap or break at this leading edge, making it difficult to draw accurately. There were some drawbacks that I mentioned.

The present invention was made to eliminate such drawbacks found in conventional automatic drafting machines, and when the part of the drafting paper on which the next drafting is to be made is fed onto the top surface of the drawing board, the previous drafting To provide a paper feed device for a novel automatic drafting machine that can accurately stop the terminal end portion of the paper at the leading edge of an effective range defined on a drafting board in which drafting is possible.

Hereinafter, details of the present invention will be explained based on the drawings.

FIG. 1 is a plan view of an automatic drawing machine for explaining one embodiment of the present invention, and FIG. 2 is a block diagram of an electric circuit in one embodiment of the present invention.

In Fig. 1, 1 is a rectangular drawing board, 2 and 2' are two X-rails installed parallel to each other along both longitudinal edges of this drawing board 1, and 3 and 3' are opposed to each other. Two X cursors 4 are driven by driving sources such as electric motors (not shown) along these two X rails 2 and 2', and 4 has both end portions connected to these two X cursors 3 and 3'. A Y rail that is fixed and orthogonal to both X rails 2 and 2', 5 is a Y cursor that is driven to run along the Y rail 4 by a drive source (not shown) such as an electric motor, and 6 is a Y cursor 5. A holder, which is attached to a drawing tool (not shown) and holds a photo sensor light emitting part (not shown),
8 is a winding part provided near the front end of the drawing board 1; 8 is a feeding part provided near the rear end of the drawing board; 9
is a long drafting paper that is wound in a roll around a feeding roller (not shown) of this feeding section 8. This drafting paper 9 is attached to a winding roller (not shown) of the winding unit 7.
is rotated by a drive source (not shown) such as an electric motor, thereby being wound around this winding roller and fed onto the upper surface of the drawing board 1. Then, the part of the drawing paper 9 to be drawn that is sent to the top surface of the drawing board 1 is stopped on the top surface of the drawing board 1, and both X cursors 3 and 3' and Y cursor 5 are set in a predetermined program. Therefore, the running drive is carried out,
By controlling the position of the Y cursor 5 to which the holder 6 for holding a drawing tool is attached, with respect to the X-Y coordinate system with the point on the front edge of the effective drawing range defined on the drawing board 1 as the origin. Drafting is performed, but unlike conventional automatic drafting machines, the present invention uses the Y cursor 5.
The holder 6 attached to the drawing tool holds the light emitting part of the photosensor in addition to the drawing tool, and when the Y cursor 5 reaches the rear edge of the effective range for drawing defined on the drawing board 1, , move the Y cursor 5 in the width direction of the drafting paper 9 along the rear part of this effective range, and mark 10 with a drawing tool on the top surface of the drafting paper 9 at a position opposite to the origin on the trailing edge of this effective range. do it like this. Thereafter, by returning the Y cursor 5 to the origin and rotating the winding roller of the winding section 7, the part of the drawing paper 9 to be drawn next is fed onto the top surface of the drawing board 1. At the same time as feeding of the drafting paper 9 begins, the light emitting part of the photosensor held in the holder 6 is operated, and this light transmitted through the drafting paper 9 is directed toward the lower surface of the drafting paper 9 opposite to this light emitting part. The light is received by the light receiving part of the photosensor provided in the structure of the drawing board 1, converted into an electrical signal corresponding to the amount of transmitted light, and this electrical signal is sent to one input terminal of the electrical circuit shown in FIG. 11. The electrical signal applied to this input terminal 11 is amplified by an amplifier 12, and
The signal is sent to both the comparison circuit 13 and the hold circuit 14. The electrical signal sent to this hold circuit 14 is transmitted to the mark 1 on the top surface of the drawing paper 9.
By applying a sampling pulse to the other input terminal 15 connected to the hold circuit 14 for a predetermined period of time before the hold circuit 1
4 and sent to the comparison circuit 13. At this point, both the electrical signal from the hold circuit 14 sent to the comparison circuit 13 and the electrical signal from the amplifier 12 correspond to the amount of light transmitted through the portion of the drawing paper 9 that is not marked with the mark 10. Since the electrical quantities of both electrical signals are equal, no electrical signal is output from this comparison circuit 13.
The drawing paper 9 is subsequently fed onto the top side of the drawing board 1. Then, after a predetermined period of time has elapsed, input terminal 1
Even if the application of the sampling pulse to 5 is removed,
The electric signal held in the hold circuit 14 is continuously sent to the comparison circuit 13, and the mark 10 attached to the top surface of the drawing paper 9 is displayed on the drawing board 1.
The comparator circuit 13 is connected to the amplifier 12 until it reaches the leading edge of the effective drawing range defined in
Since the electric signal corresponding to the amount of transmission in the portion of the drawing paper 9 not marked with the mark 10 continues to be sent from the drawing paper 9, and both electric signals sent to the comparator circuit 13 are still maintained at the same amount of electricity, the drawing The paper 9 is still fed onto the top surface of the drawing board 1,
When the mark 10 attached to the top surface of the drawing paper 9 reaches the front edge of the effective drawing range defined on the drawing board 1, it is blocked by the mark 10 and the amount of light transmitted changes. , the electrical quantity of the electrical signal applied to the input terminal 11 also changes, and two electrical signals with different electrical quantities are sent from the amplifier 12 and the hold circuit 14 to the comparator circuit 13. By outputting an electric signal and releasing the rotational drive of the winding roller of the winding unit 7, the portion of the drawing paper 9 marked with the mark 10, that is, the end portion of the previous drawing, is determined on the drawing board 1. It will stop exactly at the front edge of the effective range where drawings can be made. In this way, the part of the drawing paper 9 where the next drawing is to be made is placed on the drawing board 1.
Once placed on the top surface, drawing is continued by driving both X cursors 3 and 3' and Y cursor 5 according to a predetermined program and controlling the position of Y cursor 5 with respect to the X-Y coordinate system. be exposed.

In this embodiment, a photosensor is used to detect marks placed on the top surface of the drawing paper, but other types of photosensors may be used instead of this photosensor.

In this way, the present invention sequentially draws from the front edge of the effective range that can be drawn defined on the drawing board, and the Y cursor to which the holder for holding the drawing tool is attached is placed after this effective range. Once the edge is reached, a mark is made on the top side of the drawing paper on the trailing edge of this effective range, and this mark is placed on the top side of the drawing board when the next part of this drawing paper is fed onto the top side of the drawing board. By detecting it with a mark sensor, the rotational drive of the winding roller of the winding unit is released, and it is possible to draw a drawing in which the marked part of the drawing paper, that is, the end part of the previous drawing, is defined on the drawing board. The drawing will stop exactly at the front edge of the effective range, so if you continue drawing, the lines will not overlap or break at this front edge.
It has an excellent effect of producing accurate drawings, which is not seen in conventional automatic drawing machines.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an automatic drawing machine for explaining one embodiment of the present invention, and FIG. 2 is a block diagram of an electric circuit in one embodiment of the present invention. 1...Drawing board, 2, 2'...X rail, 3,
3'...X cursor, 4...Y rail, 5...Y
Cursor, 6... Holder, 7... Winding section, 8...
Feeding unit, 9...Drawing paper, 10...Mark, 1
1, 15...Input terminal, 12...Amplifier, 13...
...Comparison circuit, 14...Hold circuit.

Claims (1)

[Claims] 1. A rectangular drawing board and two Xs installed parallel to each other along both longitudinal edges of this drawing board.
a rail, two X cursors facing each other and driven to travel along these two X rails, and a Y rail having both end portions fixed to the two X cursors and orthogonal to the two X rails,
A Y cursor that is driven to travel along this Y rail, a holder attached to this Y cursor and holding a drawing tool, a winding section provided near the front end of the drawing board, and a rear part of the drawing board. By rotationally driving the winding roller of the winding section, a long drafting paper wound in a roll on the winding roller of the winding section is rolled onto the drawing board. The part of the drawing paper to be drawn is stopped on the top surface of the drawing board, and both the X cursor and the Y cursor are driven to run according to a predetermined program, and the drawing tool is Move the Y cursor to which the holder that holds the Y cursor is attached in the direction of feeding of the drawing paper, with the point on the front edge of the effective drafting range defined on the drawing board as the origin.
- By controlling the position with respect to the Y coordinate system, drawing is performed sequentially from the leading edge of this effective range, and when this Y cursor reaches the trailing edge of the effective range where drawing is possible, move this Y cursor to the origin. Then, by feeding the part of the drawing paper on which the next drawing is to be performed onto the top surface of the drawing board, a mark sensor is added to the holder attached to the Y cursor in an automatic drawing machine where drawing is to be continued. At the same time, when this Y cursor reaches the trailing edge of the effective range where drawing is possible, move this Y cursor in the width direction of the drafting paper along the trailing edge of this effective range, and move the Y cursor to the top surface of this drafting paper. After marking a position opposite the origin on the trailing edge of this effective range, move this Y cursor back to the origin and place the part of this drawing paper on which the next drawing is to be made on the top surface of the drawing board. By feeding the drawing paper and detecting the mark made on the top surface of the drawing paper with the mark sensor, the rotational drive of the winding roller of the winding unit is released, and the marked part of the drawing paper is removed from the drawing. A paper feed device for an automatic drafting machine, characterized in that the paper feed device is stopped at the leading edge of a possible effective range.