JPH0679590U - Paper runout prevention device for paper driven plotter - Google Patents

Abstract

(57) [Summary] [Purpose] When the paper is reciprocally driven back and forth on the platen, it prevents the paper from floating above the platen. [Configuration] When setting the paper 68 on the platen 2,
When the operator swings the operation lever 18 in a predetermined direction, the sheet setting fins 24 and 26 project upward from the side portion of the platen 2. The side edges of the sheet 68 are brought into contact with the vertical surfaces V of the sheet setting fins 24 and 26 to align the sheet 68. When the operation lever 18 is swung in the opposite direction, the paper setting fins 24 and 26 are lowered, and the paper setting fin 2
The horizontal planes H formed at 4, 26 approach the upper surface of the sheet 68 in parallel with a predetermined gap. At the time of drawing, the paper 68 is moved by the drive roller 6 and the pinch roller 44.
The platen 2 is driven in the front-back direction. At this time, paper 6
When the sheet 8 is lifted from the platen 2, the sheet 68 is brought into contact with the horizontal plane H of the sheet setting fins 24 and 26, thereby preventing the sheet from being largely lifted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper runout prevention device for a paper-driven plotter used as an output device of a computer in a computer-aided drawing system or CAD.

[0002]

[Prior art]

 In a paper-driven plotter, air blower openings are provided in the front and back of the plotter body to apply downward air pressure to the paper on the platen, and a paper rampage prevention device that prevents the paper from rising from the platen during printing is actually opened. It is disclosed in JP-A-61-2794. Also, when setting paper on the platen, project the paper setting fins to the side of the platen and bring the side edges of the paper into contact with the paper setting fins to align the paper. A sheet drive type plotter in which a sheet setting fin can be retracted from a platen is disclosed in Japanese Utility Model Publication No. 1-127893.

[0003]

[Problems to be solved by the device]

 In order to prevent the floating of the paper and the wave phenomenon by providing a blower port, it is necessary to provide a fan (pump) and a blower tube, which complicates the apparatus and raises the cost. The present invention is intended to solve the above problems.

[0004]

[Means for solving problems]

 In order to achieve the above object, the present invention sandwiches a sheet of paper on a platen (2) fixedly mounted on a main body with a driving roller (6) and a pinch roller (44) so that the driving roller (6) can be rotated normally and reversely. While rotating, the paper is fed in the front-back direction of the main body, while the pen head (10) is fed in a direction perpendicular to the paper feeding direction to perform a predetermined drawing on the paper on the platen (2). , When setting the paper on the platen (2), the paper setting fins (24) (26) for contacting the side edges of the paper and aligning the paper are projected to the side of the platen (2). In the sheet drive type plotter that is arranged, the sheet setting fins (24) and (26) are substantially horizontal with a predetermined gap between them and the upper surface of the sheet on the platen (2) during image formation. Provide a horizontal surface (H) to face During drawing, when the paper goes up floating from the sheet placing surface of the platen (2) is obtained by in contact with the horizontal plane (H).

[0005]

[Action]

 During drawing, the paper is driven on the platen (2) at high speed in the front-back direction. At this time, when the sheet floats above the platen (2), the sheet comes into contact with the horizontal plane (H) provided on the sheet setting fins (24) and (26), and the horizontal plane causes the sheet floating phenomenon, that is, the paper. Rampage is stopped.

[0006]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a paper guide plate or platen, which is fixed to a main body (not shown) of a paper drive type plotter (automatic drafting machine). The main body is supported by legs. A slit is formed in the platen 2 in the width direction thereof, and a drawing roller 4 is rotatably arranged below the slit. A drive roller 6 is rotatably arranged in a slit of the platen 2 adjacent to the slit. The rollers 4 and 6 are rotatably supported by a bracket fixed to the main body, and the rollers 4 and 6 are linked to a rotary drive device so as to rotate in the same direction in cooperation with each other. A Y rail 8 is fixedly provided between both sides of the main body, and a pen head 10 is movably attached along the Y rail 8.

A cover 12 is disposed above the moving path of the pen head 10 between the both sides of the main body, and a rear portion of the cover 12 is rotatably supported by a shaft 16 on a bracket 14 fixed to the main body. ing. Reference numeral 18 is an operation lever rotatably supported by a bracket fixed to the main body, and one handle 18a thereof is located just below the lower end of the front portion of the cover 12. The operating lever 18 is biased by a spring 22 in the counterclockwise direction in FIG.

Paper setting fins 24 and 26 have a vertical surface V and an upper horizontal surface H projecting toward the center of the platen 2. Arms 24a and 26a integral with the fins 24 and 26 are rotatably supported by shafts 28 and 30 respectively on brackets of the main body. The arm portion 24a is urged in the clockwise direction about the shaft 28 in FIG. Further, the fin 26 is biased counterclockwise about the shaft 30 in FIG. 5 by the tensile force of the spring 34. A long hole 36 is formed at one end of the arm portion 24a that is integral with the fin 24, and a projection 38 that projects from one end of the arm portion 26a that is integral with the fin 26 is formed in the long hole 36. It is slidably fitted.

Reference numeral 40 denotes a pair of pinch roller operating bars (the other one is not shown) rotatably supported by a bracket 42 of the main body, and a pinch roller 44 rotates on a shaft body installed at one end of these. It is supported freely. The operating bar 40 is biased counterclockwise about the shaft 42 in FIG. 5 by the elastic force of the spring 46. Reference numeral 48 denotes an L-shaped link that is rotatably supported by a bracket of the main body on a shaft 50. One end of the link 52 is rotatably connected about a shaft 54 to the other end of the link 52. One end of an L-shaped link 56 is rotatably connected to the end about a shaft 58.

A circular eccentric cam 60 is fixed to the other end of the link 56. Reference numeral 62 denotes a link, one end of which is rotatably connected to the other end of the operation lever 18 about a shaft 64, and the other end of the link 62 is connected to the other end of the link 48. It is rotatably connected about 66. A pin 68 is projectingly provided on the operation lever 18, and the pin 68 projects above the upper surface of the arm portion 24a.

Next, the operation of this embodiment will be described. A case where the paper 68 is set between the drive roller 6 and the pinch roller 44 will be described. When the cover 12 is lifted up about the shaft 16 and the operation lever 18 is swung clockwise about the shaft 20 against the force of the spring 22, the pin 68 causes the pin 68 to move. When the paper set fins 24 and 26 are separated from the arm portion 24a of the upper part and the pressing force of the pin 68 is released, the paper set fins 24 and 26 swing around the shafts 28 and 30 by the elasticity of the springs 32 and 34, The vertical surface V for guiding the sheet protrudes to the side of the platen 2 from the upper surface of the platen 2 to the highest position, as shown in FIGS. 1, 2 and 6. On the other hand, the swing of the operation lever 18 about the axis 20 in the clockwise direction causes the link 62 to move to the left in FIG. 6, and this movement causes the link 48 to move in the clockwise direction about the axis 50. Rock to. As a result, the links 52 and 56 descend, and the eccentric cam 60 pushes the operating bar 40 downward about the shaft 42 in the clockwise direction. The pinch roller 44 is separated from the drive roller 6 by a predetermined gap due to the clockwise swinging of the operation bar 40 about the shaft 42, and the sheet can be inserted between the rollers 44, 6. It

The operator inserts the paper 68 between the pinch roller 44 and the drive roller 6 and sets the side edge of the paper 68 on the vertical surface V of the paper setting fins 24 and 26 as shown in FIGS. 1 and 2. To match. Next, the operator tilts the operation lever 18 clockwise to a predetermined position around the shaft 20 as shown in FIG. As a result, the paper setting fin 24 is pressed by the pin 68 and swings counterclockwise in FIG. 5 about the shaft 28, and the vertical surface V of the paper setting fin 24 descends by a predetermined distance. Thus, the upper horizontal surface H horizontally approaches the side of the paper 68 on the platen 2. (See Figures 3, 4 and 5)

When the paper setting fin 24 swings counterclockwise about the shaft 28, one end of the arm portion 26 a of the other paper setting fin 26 is pushed up by the protrusion 38, and the paper setting fin 26 is rotated by the shaft 30. Around the center, the vertical plane V of the sheet set fin 26 descends by a predetermined distance, and the upper horizontal plane H horizontally approaches the upper surface of the side of the sheet 68 on the platen 2. On the other hand, when the operation lever 18 swings counterclockwise about the shaft 20 as a center, the link 62 moves to the right in FIG. 5, and the link 48 rotates the shaft 50 as a center in a counterclockwise direction. Rock to. As a result, the link 52 rises and the pressing force applied to the pinch roller actuation bar 40 by the eccentric cam 60 is released, and the actuation bar 42 is swung counterclockwise about the shaft 42 by the elastic force of the spring 46. The pinch roller 44 is pressed against the drive roller 6 via the paper 68.

The force of the spring 22 that urges the operating lever 18 counterclockwise about the shaft 20 causes the force of the spring 32 that urges the arm portion 24 a of the fin 24 about the shaft 28 in the clockwise direction. The force and the arm portion 26a of the fin 26 are set to be stronger than the force of the spring 34 that urges in the counterclockwise direction around the shaft 30, and the operating lever 18 is shown in FIG. , Swings counterclockwise around the shaft 20 and holds a predetermined state. Next, the cover 12 is lowered to cover the periphery of the traveling path of the pen head 10.

The spring 22 may not be provided, and the cover 12 may lock the swing of the operation lever 18 in the clockwise direction about the axis 20. The open / closed state of the cover 12 and the up / down state of the upper horizontal surface H of the fin 24 are detected by the sensors 70 and 72, and the output signals of the sensors 70 and 72 are supplied to the controller. When the operator presses the drawing start button on the operation panel provided on the main body, the controller confirms by the sensor 70 that the cover 12 is lowered to a predetermined position, and the upper horizontal surface H of the fins 24 and 26 is It is confirmed by the signal of the sensor 72 that the platen 2 is descending, and the operation proceeds to the drawing operation. The controller controls the X motor that rotates the drive roller 6 and the drawing roller 4 to feed the paper 68 along the platen 2 in the front-rear direction of the main body, while the pen head 10 moves along the Y rail 8. While rotating the Y motor for feeding in a direction perpendicular to the feeding direction of the paper 68, the writing tool 74 held by the pen head 10 is controlled to move up and down so that the tip of the writing tool 74 contacts the paper 68 on the drawing roller 4 or , Separate. A predetermined pattern is formed on the paper 68 by the interaction of the vertical movement of the writing instrument 74, the movement of the pen head 10 across the paper 68, and the movement of the paper 68 along the platen 2.

Lifting of the paper 68 from the platen 2 and undulating motion of the paper 68 during image formation are restricted by the upper horizontal surfaces H of the paper set fins 24 and 26. The distance between the paper 68 and the upper horizontal planes H of the fins 24, 26 is set to a value obtained by adding an appropriate distance to the thickness of the paper 68, which causes the wave and lift of the paper 68 during drawing to It is regulated to the minimum by the horizontal surface H, and is appropriately set so that the forward movement of the paper 68 does not become heavy due to friction with the horizontal surface H. In order to completely remove the friction between the paper 68 and the vertical surfaces V of the fins 24 and 26 during the printing, the fins 24 and 26 are moved leftward in FIG. The vertical surface V of the fins 24, 26 may be horizontally separated from the side edge of the sheet 68 by a predetermined distance.

7 to 10, recesses G are provided on the upper portions of the fins 24 and 26, and the sheet setting fins 24 and 26 are lowered during image formation so that the vertical surface V is placed on the platen 2 on the sheet. The friction between the sheet setting fins 24, 26 and the sheet 68 can be completely removed by retracting the sheet from the surface and configuring the recess G so as to face the side edge of the sheet 68. . The upper horizontal surface H prevents the paper sheet from being lifted from the platen 2 and undulating during printing. When setting the paper, as shown in FIGS. 7 and 8, the paper setting fins 24, 26 are raised so that the vertical surfaces V of the paper set fins 24, 26 project above the platen 2. Like the embodiment shown in FIG. 5, the paper setting fins 24, 26 can be moved up and down by an operating lever.

[0018]

【effect】

 Since the present invention is configured as described above, it is possible to prevent the paper from floating up with a simple configuration. Furthermore, if the gap between the upper horizontal surface of the paper setting fin and the paper is set to be small, it is possible to perform printing. Therefore, there is an effect that the corrugation phenomenon of the paper that may occur when the paper is pulled up on the platen can be prevented.

[Brief description of drawings]

FIG. 1 is an external view of a main part.

FIG. 2 is a sectional view of the same.

FIG. 3 is an external view of a main part.

FIG. 4 is a sectional view of the same.

FIG. 5 is an explanatory side view of the plotter.

FIG. 6 is an explanatory side view of the same.

FIG. 7 is an external appearance explanatory view of a main part showing another embodiment.

FIG. 8 is a sectional view of the same.

FIG. 9 is an external appearance explanatory view of a main part showing another embodiment.

FIG. 10 is a sectional view of the same.

[Explanation of symbols]

 2 platen 4 drawing roller 6 drive roller 8 Y rail 10 pen head 12 cover 14 bracket 16 shaft 18 operation lever 20 shaft 22 spring 24 paper set fin 26 paper set fin 28 shaft 30 shaft 32 spring 34 spring 36 long hole 38 protrusion 40 bar 42 Axis 44 Pinch roller 46 Spring 48 Link 50 Axis 52 Link 54 Axis 56 Link 58 Axis 60 Cam 62 Link 64 Axis 66 Axis 68 Paper 70 Sensor 72 Sensor 74 Writing instrument

Claims (1)

[Scope of utility model registration request] 1. A sheet on a platen (2) fixed to a main body is sandwiched by a driving roller (6) and a pinch roller (44), and the sheet is rotated by the forward and reverse rotations of the driving roller (6). While feeding in the front-back direction of the main body, the pen head (10) is fed in a direction perpendicular to the feeding direction of the paper to perform a predetermined drawing on the paper on the platen (2). A sheet driving device in which sheet setting fins (24) and (26) for contacting the side edges of the sheet and aligning the sheet when setting the sheet are arranged to project on the side of the platen (2). In the mold plotter, the horizontal plane (H ), And when drawing
A paper ramp-up prevention device for a paper-driven plotter, wherein the paper comes into contact with the horizontal surface (H) when the paper floats from the paper mounting surface of the platen (2).