JP2903436B2 - Roll paper transport mechanism of automatic drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a mechanism for winding and feeding a roll paper of an automatic drafting machine.

[0002]

2. Description of the Related Art In a paper moving (paper driving) type plotter shown in FIG. 11, a drawing roll for drawing by feeding a rolled-out portion of a roll paper 2 on a platen 1 in forward and reverse directions by forward and reverse rotations of a driving roller 3. Paper feeding operation,
There are a roll paper supply / conveyance operation for supplying the roll paper 2 for one drawing onto the platen 1 and a roll paper take-up / conveyance operation for winding the formed roll paper 2 around the take-up scroller 4.

The roll paper supply / transport operation includes the following:
(A) A roll paper supply scroller (not shown) is rotated by a motor, a roll paper 2 for one image is drawn out from the supply scroller, and the roll paper is pulled up on a platen by a driving roller 3 and a pinch roller 5. There is a method of drawing the roll paper directly from a roll paper supply scroller that is freely rotatable by the drive roller 3 and the pinch roller 5 (B).

[0004]

According to the above method (A), the platen curve, the position of the screw hole for mounting the platen,
Due to the manufacturing errors such as the winding position and the left and right mounting positions of the supply scroller, the transport path lengths at the left and right ends of the roll paper, that is, the transport path length between the supply scroller and the drive roller are different.
The roll paper cannot be transported accurately.

[0005] In addition, the above method (B) has a problem that, in addition to the above problem, the roll paper is likely to be displaced with respect to the driving roller and the pinch roller.

The above problem causes a problem that line segments are not continuous in so-called joint drawing. Further, at the time of winding and transporting the roll paper, there is a defect that the tension of the roll paper becomes uneven right and left and the transport of the roll paper is shifted.

Further, the conventional apparatus has a defect that the roll wire rubs the edge of the platen during roll paper winding and feeding and transport, and the roll paper is damaged. An object of the present invention is to eliminate the above defects.

[0008]

In order to achieve the above object, the present invention holds a roll paper on a paper loading member between a driving roller and a pinch roller, and places the roll paper on the paper loading by forward and reverse rotation of the driving roller. While moving the drawing head on the member in the front-rear direction, the drawing head is controlled to move in a direction crossing the roll paper on the paper placing member so as to draw a predetermined pattern on the roll paper, and the roll paper is drawn. The roll paper supply scroller disposed below the placing member is drawn out onto the placing member by rotation of the driving roller, and the rolled-out portion of the roll paper is wound around a winding scroller disposed below the placing member. In the roll paper transport mechanism of the automatic drafting machine described above, one of or both of the front and rear portions of the paper placing member is positioned below the roll paper feeding portion so as to face the rolled portion. A paper tension member is disposed, and the paper tension member is displaceably supported at two positions of a protruding position in contact with the roll paper and a retracted position away from the roll paper opposed to the paper tension member. The paper tension member is automatically driven to the protruding position, and is automatically driven to the retracted position during image formation.

[0009]

When the roll paper is pulled up onto the paper placing member by the rotation of the drive roller and the roll paper is conveyed onto the platen, or when the roll paper is wound, the paper tension member is automatically transferred to the roll paper. The pressure member is pressed and the impact of the tension member on the roll paper is absorbed by the flexure of the tension member, and the paper tension member in contact with the side where the roll paper is strongly pulled is largely flexed. The tension on the left and right sides of the paper becomes uniform, and there is no conveyance deviation.

At the time of printing, the paper tension member is automatically retracted so as not to come into contact with the roll paper, thereby preventing a change in the tension of the roll paper or the elongation of the roll paper during printing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to embodiments shown in the accompanying drawings. In FIG. 1, reference numeral 6 denotes a paper placing member (platen) of a paper-driven automatic drafting machine (paper moving plotter).
(The other is not shown).

A slit is formed in the curved upper surface plate of the paper placing member 6 in the Y direction, and a driving roller 8 is rotatably arranged in this slit in association with an X-axis driving system.

A Y-rail (not shown) extending along the Y-axis between the main bodies 29 on the legs 7 is disposed in parallel on the paper placing member 6, and the Y-rail is attached to the Y-axis. A drawing head 9 linked to a drive system is movably mounted.

Pinch rollers 10, 11 are provided on the Y rail.
Are supported by the drive roller 8 so as to be able to move up and down, and the pinch rollers 10 and 11 are in elastic contact with the drive roller 8 by a spring force.

A take-up scroller 12 is rotatably connected to a rotation drive system (not shown) between inner surfaces of the leg 7 which are located below the front and back of the paper placing member 6 and opposed to each other. It is detachably supported.

A tension roller 13 is rotatably supported between the legs 7 near the take-up scroller 12.

A roll paper supply scroller 14 is detachably supported between the legs 7 below the rear portion of the paper placing member 6 in association with a rotary drive system.

A plurality of sliding keys 15 are fixed on the lower bottom wall of the paper placing member 6 in a direction perpendicular to the lower front and rear surfaces 6a and 6b of the placing member 6, and the keys 15 The key grooves 18 of the side L-shaped slide members 16 and 17 disposed on the front and rear portions of the lower bottom wall of the placing member 6 respectively.
Are slidably fitted.

The opposite ends of the sliding members 16 and 17 are bent in the vertical direction, and the vertical surface 16 of the bending portion is bent.
A cylindrical cam 20 rotatably supported between the legs 7 via a bearing 19 is disposed between the cylindrical cams 20 and 17a.

The slide members 19 and 17 are urged in a direction approaching each other by a return spring 23, and the urging force causes the vertical surfaces 16a and 16a of the slide members 16 and 17 to move.
17a is in elastic contact with the cam 20.

Each of the slide members 16 and 17 has
The rear ends of the paper tension members 24 and 25 made of an elastic resin sheet or the like are fixed.

The paper tension member 23 fixed to the slide member 16 is divided into three components and arranged, and the open ends of each component are arranged as shown in FIG.
The tip of the roll paper 26
It is bent vertically so as not to damage it.

A sheet tension member 25 composed of three components is similarly fixed to the slide member 17 side.

A pair of tension rollers having a space slightly larger than the thickness of the roll paper are rotatably disposed on the paper transport path between the supply scroller 14 and the tension member 25, and the roll paper 26 is moved by the tension. You may make it pass between rollers.

In FIG. 1, an actuator 27 such as a rotary solenoid is fixedly mounted on the other leg not shown, and an output rotation shaft 28 of the actuator 27 is connected to the support shaft 21 of the cam 20.

A Y-axis driving device for driving the drawing head 9 along the Y-rail, a pen lifting / lowering driving device built in the drawing head 9, an X-axis driving device for rotating and driving the driving roller 8;
The winding drive for rotating the winding scroller 12, the supply driving device for rotating the supply scroller 14, and the actuator 27 are connected to a controller (not shown) built in the main body 29 so as to be controlled by this controller. Is configured.

Next, the operation of this embodiment will be described in detail with reference to the flowchart shown in FIG. When the operator enters the drawing program from the label 1, first, in step 2, the supply scroller 14 on which the roll paper 26 is wound is set between the legs 7, and the roll paper 26 is extracted from the supply scroller 14, and the extraction is performed. The portion is passed through a front portion of the paper placing member 6, between the drive roller 8 and the pinch rollers 10 and 11, a rear portion of the paper placing member 6, and a lower side of the tension roller 13, and is wound by the winding scroll roller 13.

When the setting of the roll paper 26 is completed in step 2, the controller proceeds to a drawing operation in step 3.

At the time of drawing, the forward and reverse rotation of the drive roller 8 causes
The roll paper 26 sandwiched between the driving roller 8 and the pinch rollers 10 and 11 is sent on the paper placing member 6 in the front-rear direction (X-axis direction), while the drawing head 9 is moved in the longitudinal direction of the roll paper 26. A predetermined pattern is drawn on the roll paper 26 on the paper placing member 6 by moving on the paper placing member 6 in the orthogonal Y-axis direction.

During the drawing operation, the roll paper 26 keeps a slack state below the front and rear portions of the paper placing member 6 to prevent a change in tension of the roll paper 26 during drawing. . A change in the tension of the roll paper 26 during drawing causes a drawing error.

In FIG. 3, R1 and R2 are the roll paper 2 being plotted.
6 shows the locus of movement on the winding side, and the paper tension member 24 in the retracted state does not come into contact with the roll paper 26. The same applies to the tension member 25.

When the drawing operation is completed, the controller determines in step 4 whether or not to draw on the next page of the roll paper, and when the determination is affirmative, proceeds to step 5 for winding the roll paper 26. At this time, the supply scroller 14 is rotated to draw out the roll paper 26 for the next drawing.

The controller determines whether or not the winding has been completed in a determination step 6, and if the determination is negative, the controller rotates the winding scroller 12 in the winding direction in a step 7. At this time, the controller determines in step 8 that the actuator 2
7 is turned ON. As a result, the wide portion of the cam 20 is located between the vertical surfaces 16a and 17a of the slide members 16 and 17.

At this time, the slide members 16 and 17 move toward the front and rear of the sheet placing member 6 against the tensile force of the return spring 23, respectively.

By the movement of the slide members 16 and 17, the paper tension member 25 comes into contact with the roll paper 24 below the front portion of the paper placing member 6, and the paper tension member 25 Below the rear,
It contacts the roll paper 24.

When the tension member 24 comes into contact with the roll paper 26, the roll paper 26 on the winding side is in a tension state.

The right and left tensions at the time of winding the roll paper 26 are made uniform by the tension member 24, so that the right and left displacement of the roll paper 26 is eliminated, and the impact tension applied to the roll paper 26 is absorbed by the bending of the tension member 24. Thereby, the roll paper 26 and
Deviation between the driving roller 8 and the pinch rollers 10, 11 is prevented.

The controller repeats the operations of Steps 6 to 9 and, if affirmative in Step 6, determines in Step 1
At 0, the rotation of the winding scroller 12 is stopped.

Next, the drive roller 8 is rotated by the slap 11, and the roll paper 26 for one drawing is pulled up onto the paper placing member 6.

As another method, the roll paper is not drawn out from the supply scroller 14 in advance in step 5, but the rotation of the drive roller 8 causes the supply scroller 14 that freely supports the roll paper 26 to freely rotate. It is pulled out directly onto the paper placing member 6 for one drawing.

When the roll paper is supplied, the roll paper 2
The difference in the left and right tensions of the roll paper 26 due to the difference in the lengths of the right and left transport paths is absorbed by the deflection of the paper tension member 25 abutting on the roll paper 26 strongly pulled by the drive roller 8. Accordingly, the length of the left and right transport paths of the roll paper 26 is adjusted by the paper tension member 25, and the roll paper 24 is driven by the drive roller 8 and the pinch rollers 10,
The paper is smoothly supplied onto the platen 6 with equal tension on the left and right without shifting between the rollers 11.

During the supply of the roll paper, the roll paper 26 is conveyed while being pressed against the paper tension member 25, and the impact when the roll paper 26 is pulled is absorbed by the bending of the paper tension member 25.

When the roll paper 26 pulled out from the supply scroller 14 is pulled up by the driving roller 8, tension is generated in the roll paper 26 because the roll paper 26 passes through a pair of tension rollers (not shown) when the roll paper 26 passes between the pair of tension rollers (not shown). This is because the stopping force works.

Next, at step 12, the controller turns off the actuator 27. As a result, the slide members 16 and 17 move in the direction approaching each other due to the tension of the return spring 23, and the tension members 24 and 25 move back to a position where they do not come into contact with the opposing roll paper 26. , 25 are released (step 13). Next, the controller proceeds to step 3.

As shown in FIGS. 7 to 9, the lower part of each of the front and rear parts of the paper placing member 40 of the automatic paper moving drafting machine has a mounting member 41 centered on an axis parallel to the Y-axis direction.
Is rotatably supported by a shaft 42, and the rotation shaft 4 of the mounting member 41 is
2 is connected to an output rotary shaft of an actuator 43 such as a rotary solenoid fixed to a leg (not shown), a paper tension member 44 is fixed to the mounting member 41, and the mounting member 41 is returned by a spring 45. It may be configured to bias in the direction.

In the above configuration, when the actuator 43 is energized and driven, the mounting member 41 rotates in the horizontal direction, and the paper tension members 44 on the roll paper take-up side and the supply side mounted on the mounting member 41 are as shown in FIG. As shown in the drawing, the roll paper 46 comes into contact with the rolled-out portion of the roll paper 46 to apply tension thereto.

When the actuator 43 is turned off, the mounting member 41 swings in the return direction by the tensile force of the spring 45, as shown in FIG.
It is separated from the rolled portion of the roll paper 46 hanging down below the front and rear portions of the paper placing member 40, and does not come into contact with the roll paper 46 during drawing.

In the embodiment shown in FIG.
1 was driven by the actuator 43, but as shown in FIG.
7, the output shaft of gears 48 and 49, pulley 50, belt 5
1, a pulley 52, a shaft 53 interlocked with the pulley 52, a torque limiter 54, and a one-way clutch 55 connected to the rotation shaft 42 of the mounting member 41. When the winding scroller 12 rotates, the paper tension member is automatically set. 44
Is projected to a position where it contacts the roll paper 26 on the take-up side, and when the rotation of the take-up scroller 13 stops, the paper tension member 44 is automatically retracted by the return spring 45 to a position where it does not contact the roll paper 26. You may.

In the above configuration, the rotation of the take-up scroller 12 is transmitted to the tension shaft 53 and the
Rotates and comes into contact with the stopper, and thereafter, the torque limiter 54 operates and the shaft body 53 idles. The attachment member on the roll paper supply side also cooperates with the winding scroller 12 by a transmission mechanism similar to that shown in FIG. 10, and when the winding tension roller 12 is rotating, the paper tension member contacts the roll paper 26 and the winding scroller 12 stops. , So that the contact is released.

In this embodiment, when the tension is applied to the roll paper 26 from the tension member while the take-up scroller 12 is rotating and the rotation of the take-up scroller 12 is stopped, the roll paper 26 is in a non-tension state. The roll paper supply operation by the rotation of the drive roller in step 11 in step 4 needs to be performed while the winding scroll roller 12 is rotating. Specifically, in FIG. 4, the supply operation of the roll paper is performed in parallel with step S7.

As shown in FIG. 6, a paper placing member 32 (table) of a known flat bed type automatic drafting machine having a roll paper supply scroller 30 and a winding scroller 31 is provided.
The paper tension members 33, 34 are disposed so as to be able to protrude and retreat by driving of an actuator 35 under and below the paper tension members 33, and are controlled by a controller.
May be driven and controlled in the retreating direction. In FIG. 6, 38 is a drawing head, and 39 is a Y rail.

When the tension members 33 and 34 are in the protruding state, they come into contact with the roll paper 37 to apply tension thereto, and the roll paper 37 is supplied and wound when the roll paper 37 is supplied.
Of the tension on the left and right sides of the roll paper 37
To prevent transport deviation.

In the retracted state, the tension members 33 and 34 separate from the roll paper 37 and do not apply tension thereto. Therefore, tension is not applied to the roll paper 37 during drawing, and the roll paper is not stretched, so that a drawing error does not occur.

Next, the operation of the flatbed type automatic drafting machine shown in FIG. 6 will be described with reference to the flowchart shown in FIG. First, in step 1, the operator draws out the roll paper 37 from the supply scroller 30, and
2 and rolled up by the winding scroller 31.

In step 2, the controller executes drawing with the drawing head 38 on the roll paper 37 on the placing member 32.

When the drawing is completed, the controller determines in step 3 whether or not to print the next page.
The winding of the roll paper 37 by one rotation is started.

The controller determines in step 5 whether or not the winding has been completed. If the controller determines in the negative, the controller continues the rotation of the winding scroller 31 in step 6.

At this time, the actuator 35 is turned on, and the paper tension members 33 and 34 are brought into contact with the roll paper 37 to bring the roll paper 37 into a tension state (step 8).

If an affirmative determination is made in step 5, the rotation of the winding scroller 31 is stopped in step 9, and then the actuator 35 is turned off in step 10. This allows
The paper tension members 33 and 34 are retracted by the return spring, and the tension on the roll paper 37 is released.

Next, the controller proceeds to step 2. In the embodiment of FIG. 6, the tension members 33, 34 are used.
The structure for projecting and retracting is the same as the embodiment shown in FIG. 1 or the embodiment shown in FIG.

When the tension member projecting and retracting mechanism shown in FIG. 10 is employed in the flat bed type automatic drafting machine, the actuator on / off operations of steps 7 and 10 in the flowchart of FIG. 5 are not required.

[0062]

According to the present invention, when the roll paper is taken up or supplied, the paper tension member automatically protrudes toward the roll paper transport path and comes into contact with the roll paper, so that the non-uniform tension applied to the roll paper becomes uniform. Adjustment can be made, and the impact of the impact on the roll paper can be absorbed to prevent roll paper transport misalignment.

During drawing, the paper tension member is automatically retracted to release the tension on the roll paper.
In addition to preventing the roll paper from being stretched due to the tension applied to the roll paper, the paper moving plotter has the effects of preventing a change in tension on the roll paper during drawing.

[Brief description of the drawings]

FIG. 1 is an external view.

FIG. 2 is an external view of a main part.

FIG. 3 is a side view of a main part.

FIG. 4 is a flowchart.

FIG. 5 is a flowchart of another embodiment.

FIG. 6 is an external view showing another embodiment.

FIG. 7 is an external view showing another embodiment.

FIG. 8 is a side view for explaining the operation of the embodiment shown in FIG. 7;

9 is an operation explanatory side view of the embodiment shown in FIG. 7;

FIG. 10 is an external view showing another embodiment.

FIG. 11 is an external view of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Platen 2 Roll paper 3 Drive roller 4 Take-up scroller 5 Pinch roller 6 Paper placement member 7 Leg 8 Drive roller 9 Drawing head 10 Pinch roller 11 Pinch roller 12 Take-up scroller 13 Tension roller 14 Supply scroller 15 Key 16 Slide member 17 slide member 18 key groove 19 bearing 20 cam 21 support shaft 23 spring 24 paper tension member 25 paper tension member 26 roll paper 27 actuator 28 output rotation shaft 29 main body 30 supply scroller 31 take-up scroller 32 paper mounting member 33 paper tension member 34 Paper Tension Member 35 Actuator 36 Panel 37 Roll Paper 38 Drawing Head 39 Y Rail 40 Paper Loading Member 41 Mounting Member 42 Axis 43 Actuator 44 Paper Tension Member 46 Spring 47 Motor 48 Gear 49 Gear 50 Pulley 51 Belt 52 Pulley 53 Shaft 54 Torque limiter 55 One-way clutch

Claims (2)

(57) [Claims] 1. A roll paper supply scroller and a take-up scroller are rotatably disposed below the front and rear portions of a paper placement member, and the roll paper on the roll paper supply scroller is wound through the paper placement member. In a roll paper transport mechanism of an automatic drafting machine that is wound up around a scroller, a paper tension member is disposed under one or both of the front and rear portions of the paper mounting member so as to face the roll paper unwinding portion, The paper tension member is displaceably supported at two positions, a protruding position that comes into contact with the roll paper and a retreat position that separates from the roll paper, and automatically winds and supplies the paper tension member when the roll paper is wound and supplied. A roll paper transport mechanism for an automatic drafting machine, wherein the roll paper transport mechanism is driven to a protruding position and is automatically driven to the retracted position during drawing. 2. A roll paper on a paper placing member is sandwiched between a driving roller and a pinch roller, and the roll paper is fed forward and backward on the paper placing member by forward and reverse rotation of the driving roller, while the paper is fed. The drawing head is controlled to move in a direction crossing the roll paper on the placing member so as to draw a predetermined pattern on the roll paper, and the roll paper is fed from a roll paper supply scroller arranged below the placing member. Machined by the rotation of the drive roller on the mounting member,
In a roll paper transport mechanism of an automatic drafting machine configured to wind up a rolled-out portion of the roll paper on a winding scroller disposed below the placing member, one or both of the front and rear portions of the paper placing member may be disposed. A paper tension member is arranged facing the rolled portion of the roll paper, and the paper tension member can be displaced to two positions of a protruding position in contact with the roll paper and a retreating position separated from the roll paper facing the roll paper. Supporting, automatically winding the paper tension member to the protruding position when winding and feeding the roll paper, and automatically driving the paper tension member to the retracted position when drawing. Machine roll paper transport mechanism.