JP2580269B2 - XY plotter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an XY plotter, and more particularly to a paper-moving XY plotter.

[Conventional technology]

The XY plotter is a device for performing a predetermined drawing on a sheet by moving the pen relatively to the sheet in the X direction, the Y direction, and a combination direction thereof. The XY plotter is roughly classified according to the relative movement method between the pen and the paper.
There are a flatbed type in which the pen is moved in the X direction and the Y direction while fixing the paper, and a paper moving type in which the pen is moved only in one direction in the X direction or the Y direction and the paper is moved in a direction perpendicular to this direction. The present invention relates to a paper moving type XY plotter sheet positioning system.
Since the XY plotter performs a predetermined drawing at a predetermined position on a sheet, the positional relationship between the pen and the sheet must be accurately determined. (Generally, commands and data for plotting to the plotter are given from a host computer.) When a sheet is attached to the XY plotter before plotting, one of two methods is generally used to determine the position of the sheet with respect to the pen. Have been. One is a method based on paper position detection. In this method, the paper is moved, an edge of the paper is detected using an optical sensor, and the position is corrected using these coordinates. The other method uses a mechanical stopper to press the end of the sheet against a stopper provided on the plotter when the sheet is loaded, thereby determining the position with respect to the pen. Compared with the method using the paper position detection, the method using the mechanical stopper has the advantage that the cost is low and the reliability is high because a sensor for detecting the paper position and the position correction calculation function are not required.

FIG. 3 shows an outline of a sheet positioning method using a mechanical stopper of a conventional XY plotter. 1 in the figure
Is attached to the plotter such that it can be moved in the Y direction by a pen. (The pen mounting structure is not shown.)
Is a sheet, which is movable in the X direction. In order to move the paper 2 in the X direction, the paper 2 is nipped while being pressed by two pairs of pinch rollers 3 and a friction roller 4, and the friction roller 4 is rotated. Reference numeral 5 denotes a paper stopper, which protrudes from the bed 6. The pen 1, the pinch roller 3, and the paper stopper 5 are all movable in the vertical direction, and are moving upward when the paper 2 is mounted on the plotter (the state shown in FIG. 3). The sheet is inserted and positioned along the bed 6 until the end surface of the sheet comes into contact with the sheet stopper 5. The position of the sheet 2 in the Y direction is determined by pressing the sheet 2 against the guide 7. At the time of drawing, the stopper 5 is lowered below the bead 2 so as not to hinder the movement of the sheet 2,
The pen 1 and the pen 1 are pressed down and pressed against the paper 2.

[Problems to be solved by the invention]

However, such a positioning structure has the following problems. That is, the paper 2 has various properties, some of which are soft and have no "strain".
When such a sheet is used as the sheet 2, the sheet 2 may be deformed when pressed against the stopper 5 as shown in FIG. 4, so that accurate positioning cannot be performed.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem of the prior art, and to provide a method of positioning a sheet by a mechanical stopper capable of performing accurate alignment regardless of the properties of the sheet 2.

[Means for solving the problem]

The above object is achieved by installing a paper stopper on a bed and positioning the paper while sandwiching the paper between the paper stopper and the bead.

[Action]

The paper stopper drops just above the bed when the paper is attached, and forms a narrow space between the paper stopper and the bed. The sheet is inserted between the bead and the sheet stopper and pressed while being restrained in the vertical direction, so that accurate positioning can be performed without deformation.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 and 2, the same numbers as those in FIG. 3 indicate the parts having the same product name.

FIG. 1 shows a state in which a sheet is attached. The pinch roller 3 is rotatably supported by a pinch roller support member 8,
The pinch roller support member 8 is supported by the frame body 9 so as to be rotatable around 8a. On the extension of the pinch roller support member 8, the paper stopper 5 is attached integrally with the pinch roller support member. The paper stopper 5 has an L-shaped tip. Next, the operation of this mechanism will be described. At the time of paper attachment, the pen 1 is moving upward. Pinch roller 3
Is moved upward because an external force is applied clockwise around the support portion 8a of the pinch roller support member 8 (the structure for applying the external force is not shown). At this time, the L-shaped paper stopper 5 attached on the extension of the pinch roller support member 8
Is lowered, and the plane 5a parallel to the bed forms a slight gap with the bed 6. Further, at this time, the vertical surface 5b of the leading end of the paper stopper 5 with respect to the bead 6 is lowered below the upper surface of the bead 6 at the end of the bead 6 as shown in FIG. When the sheet is mounted in such a state, the sheet 2 is inserted from the left side to the right side in FIG. The paper 2 passes through the gap between the pen 1, the pinch roller 3 and the bead 6, passes through a small gap between the paper stopper 5 and the bead 6, and is inserted and stopped until it hits the L-shaped end face 5 b of the paper stopper 5. . At this time, since there is only a small gap between the paper stopper 5 and the bed 6, the paper 2 is restricted by the paper stopper 5 and the bed 6 and cannot be deformed. Therefore, the deformation of the sheet that occurs when the sheet is pressed against the sheet stopper, which is a problem of the related art, is eliminated, and the accurate sheet positioning can be performed.

FIG. 2 shows a state when plotting the XY plotter. The pen 1 and the pinch roller 3 descend and hold the sheet 2 between the pen 1 and the pinch 6. At this time, the paper stopper 5 is raised so as not to hinder the movement of the paper 2.

〔The invention's effect〕

According to the present invention, since the paper can be restrained by the gap between the bead and the paper stopper, there is an effect that when the paper is pressed against the paper stopper, no deformation occurs and accurate paper positioning can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which paper is mounted on an XY plotter of the present invention, FIG. 2 is a view showing a side view at the time of drawing, FIG. 3 is a view showing a conventional XY plotter, and FIG. FIG. 5 is a side view of a state in which a sheet is pressed against a sheet stopper and deformed. 1 ... pen, 2 ... paper, 3 ... pinch roller, 4 ...
Friction roller, 5: paper stopper, 6: bead, 8: pinch roller support member, 9: frame.

Claims (1)

(57) [Claims] 1. An XY plotter in which a sheet moves in one direction and a pen moves in a direction perpendicular to the direction, is a rotatable state for raising and lowering a pinch roller for pressing the sheet against a friction roller. And a substantially L-shaped paper stopper mounted on an extension of the pinch roller supporting member on the side opposite to the pinch roller. The paper stopper is attached to the paper stopper when the paper is mounted. An XY plotter characterized by lowering the paper stopper until a small gap is formed between the parallel surface and the bead.