JP2581374Y2 - Wave prevention device for plotter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a recording medium from vibrating in a recording medium drive type plotter.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. Sho 62-196596 discloses that
A plotter is disclosed that absorbs the wave of a sheet of paper having a chain hanging below a paper guide. JP-A-63-231
Japanese Patent Application Publication No. 999 discloses a wave isolator provided with a wave isolator before and after a plotter. 1-1-1387
Japanese Patent Publication No. 95 discloses a plotter that hangs a sheet under a platen to absorb a wave of a sheet. 1
Japanese Patent No. 171696 discloses a plotter in which a braking plate is provided below the platen to prevent paper runaway. JP 2
Japanese Patent Application Publication No. -137982 discloses a plotter in which a chain or sheet is prevented from running out of paper before and after the plotter.

[0003]

[Problems to be Solved by the Invention] In order to prevent the paper from waving by the chain, the contact surface between the chain and the paper is small.
Also, it cannot respond to a change in the paper size. In a plotter using a sheet material, when the sheet is curled, only the leading edge of the sheet contacts the sheet material. When the paper is pulled up, the paper is likely to be ragged, but if only the leading edge of the paper is in contact with the sheet material, the paper rag cannot be effectively prevented. Usually, the paper is often curled. The conventional apparatus using a wave isolator made of a cantilever type sheet has a problem that when the elasticity of the sheet is reduced due to aging, the contact force with the sheet is weakened, and the ability to prevent paper sloppyness is weakened. The purpose of the present invention is to eliminate the above problems.

[0004]

In order to achieve the above-mentioned object, according to the present invention, a recording medium on a guide is sandwiched between a driving roller and a pressure roller, and the recording medium is placed on the guide by forward and reverse rotation of the driving roller. In a plotter in which the pen is sent in a direction crossing the recording medium and recorded on the recording medium while the pen is sent in the front-rear direction, a cylinder is disposed at a position where the hanging portion of the recording medium is located below the guide. The upper portions of both ends of the cylindrical body are rotatably supported.

[0005]

When the recording medium is driven at a high speed in both directions on the guide, a wave is generated in a portion of the recording medium which hangs below the guide. The hanging portion where this wave occurs is in contact with the surface of the cylinder, and swings the cylinder. The swing of the cylinder absorbs the wave of the recording medium, and the wave is not transmitted to the recording medium near the pen and the drive roller.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a paper guide of the paper drive type plotter, which is supported by a plotter body 4 supported by a footrest . The surface of the paper guide 2 has a platen that is substantially horizontal with respect to the floor surface, and front and rear portions of the plotter.
It has a curved plate that curves downward. At the time of drawing, a recording medium 14 such as a sheet on the sheet guide 2 is sandwiched between a driving roller 6 and a pressure roller 8, and the forward and reverse rotation of the driving roller 6 moves the sheet guide 2 on the sheet guide 2 in the left-right direction in FIG. , Driven in the front-rear direction of the plotter.

On the other hand , a drawing head pen 12 movably attached to a Y-rail (not shown) is provided with a drawing roller 1.
5 moves in a direction crossing the recording medium 14 while contacting or separating from the recording medium 14, that is, in a direction perpendicular to the paper surface of FIG. 5, and is output from the host computer to the controller of the plotter. Plotting data is drawn or cut. Reference numerals 26 and 28 denote cylinders disposed in front and behind the paper guide 2 in parallel with the moving direction of the pen 12, that is, in the Y-axis direction. It is rotatably supported by the support shaft 18.

The upper portion of the support shaft 18 is provided with a bolt 22 and a nut 2 on a bracket 20 suspended from a bottom plate of the paper guide 2.
4 fixed. The portion bent horizontally in the lower portion of the support shaft 18 is relatively rotatably fitted into a hole 30 formed in the upper portion of the end surface of the cylindrical body 28. Cylinder 28
Is supported by the other support shaft 18 by the same structure. The cylindrical body 26 has the same structure as described above, and both end surfaces thereof are supported by a pair of support shafts 16. Reference numerals 34 and 36 denote weights, and the cylindrical body 2
The lower end of each of the end faces 6 and 28 is detachably attached by a magnet or a clip.

The contact state between the cylinders 26 and 28 and the medium 14 can be changed depending on the position of the weight. FIG. 4A
In the figures, A, B, and C indicate the positions of the weights on both end surfaces of the cylindrical bodies 26 and 28. As shown in FIG. 4B, when the weight 36 is attached to the position A, the surface of the cylindrical body 28 largely protrudes rightward with respect to the support shaft 18, and the surface of the cylindrical body 28 contacts the medium 14. The area increases.

As shown in FIG. 4C, when the weight 36 is attached to the position B, the contact area between the cylinder 28 and the medium 14 is reduced as compared with FIG. 4B, and as shown in FIG. C
When the weight is attached to the position, the contact area between the cylinder 28 and the medium 14 is further reduced. The relationship between the position of the weight and the contact area with the medium is reversed in the cylindrical body 26, and is maximum at the position C and minimum at the position A.

As shown in FIG. 5, a slide guide 38 for guiding the lever 40 to the ABC position shown in FIG. Connect the weight 36 placed inside the
0 may be used as a guide for the scale 42, and the position of the weight 36 may be changed by engaging the index recess of the slide guide 38.

In the above-described configuration, the recording medium 14 that hangs back and forth between the paper guides 2 at the time of drawing and is driven at high speed back and forth along the paper guides 2 comes into contact with the surfaces of the cylindrical bodies 26 and 28. The cylinders 26 and 28 absorb the wave of the hanging portion of the recording medium 14 by being swung about the support shafts 16 and 18, and the wave of the hanging portion of the medium 14, that is, There is no transmission to the vicinity of the pen 12 and the vicinity of the drive roller 6. Although the cylinders 26 and 28 are formed of a metal or resin ring and a sheet material stretched in a cylindrical shape, the entire body may be formed of a metal cylinder.

[0013]

As described above, the present invention uses a cylinder suspended below the guide as a member for preventing the recording medium from fluttering, so that even if the recording medium is curled, the contact area is increased. This has the effect that the contact pressure with the recording medium does not change due to aging.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of a plotter.

FIG. 2 is an exploded perspective view of a cylinder support mechanism.

FIG. 3 is an external view of a cylindrical body.

FIG. 4 is an explanatory diagram.

FIG. 5 is an external view showing another embodiment.

[Explanation of symbols]

 2 Paper guide 4Plotter body  6 Drive Roller 8 Pressure Roller 10 Drawing Roller 12 Pen 14 Recording Medium 16 Support Shaft 18 Support Shaft 20 Bracket 22 Bolt 24 Nut 26 Cylindrical Body 28 Cylindrical Body 34 Weight 36 Weight 38 Slide Guide 40 Lever 42 Scale

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B43L 13/00 B41J 15/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A recording medium on a guide is sandwiched between a driving roller and a pressure roller, and the recording medium is fed in a front-rear direction on the guide by a forward / reverse rotation of the driving roller, while a pen is moved in a direction traversing the recording medium. In a plotter adapted to record on a recording medium, a cylinder is disposed at a position below the guide where a hanging portion of the recording medium is located, and upper portions of both ends of the cylinder are rotatably supported. A wave preventing device characterized by the following.