JPH05147385A - Paper holding mechanism for plotter of paper-driving type - Google Patents

Abstract

PURPOSE:To prevent cut paper, when cutting is made with a cutter, from slipping out of position by its own weight after the cutting. CONSTITUTION:When paper on a platen 2 is cut by moving a cutter 28 in the direction intersecting the platen 2, a cover 52 shielding a traveling part of a drawing head is pushed downward so that its lower end 52a comes to a position lower than the normal position that is slightly higher than the upper face of the platen 2, and is pressed onto the paper over the platen 2, and thereby the paper is made not to slip out of the platen 2. The position to which the lower end of the cover 52 is pressed on of the paper is set, based on the cutting part of the paper, on the side opposite to a side on which the paper is interposed between a driving roller 12 and a pressure-applying roller 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper pressing mechanism in a paper drive type plotter having a paper cutting mechanism.

[0002]

2. Description of the Related Art Paper driven plotters are known which are equipped with a cutter for cutting roll paper along a cutting groove on a platen.

[0003]

In the above-mentioned conventional apparatus, as shown in FIG. 7, the portion of the roll paper 90 on the drive roller and pressure roller 92 sides is separated from the portion to be cut by the cutter 88 as a boundary. Roller is pressed on the platen. However, since the portion of the sheet 90 on the side opposite to the roller side hangs downward from the platen due to its own weight, when the sheet is cut, the cut portion is shifted downward due to the weight of the sheet 90,
I haven't been able to cut it accurately. Therefore, there is a defect that the paper 90 must be manually pressed during the cutting operation. The present invention aims to eliminate the above defects.

[0004]

In order to achieve the above object, the present invention provides a drive roller 12 for a sheet placed on a platen 2.
And the pressure roller 16 between them, the paper is fed in the front-back direction of the platen 2 by the forward and reverse rotations of the drive roller 12, while the pen 18 is moved in the direction traversing the paper to draw on the paper. Is a paper driven platter in which the cutter 28 is moved in a direction traversing the platen 2 to cut the paper on the platen 2, and a cover 52 covering substantially the entire widthwise direction of the platen 2 is provided at a lower end 52 thereof.
a is swingably supported by the machine body of the plotter between a normal lowered position in which a is slightly raised with respect to the upper surface of the platen 2 and an open position in which the upper surface of the platen 2 is opened.
The lower end 52a of the cover 52 has the platen 2
With the sheet cutting execution portion as a boundary, the sheet can be lowered to a sheet pressing position where it abuts the upper surface of the platen 2 on the side opposite to the sheet holding side.

[0005]

When the work of cutting the paper is performed, the lower end 52a of the cover 52 is lowered to the paper pressing position, and the paper on the platen 2 is pressed by the lower end. In this state, the paper is cut by the cutter 28. While the paper is being cut, the side of the paper that hangs from the platen 2 is pressed by the lower end 52a of the cover 52 to prevent the paper from shifting.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. 2 is a paper-driven plotter 4
It is a platen (paper loading plate) fixed to the machine body 6 of
Located above this, a Y rail 8 is installed on the machine body 6. Inside the platen 2, the drawing roller 1
0 and a driving roller 12 are rotatably arranged in association with an X-axis driving device, and the upper portions of the rollers 10 and 12 are arranged in a slit formed on the platen 2 in the Y-axis direction. ..

The rollers 10 and 12 are rotatably supported by the machine body 6. A pressure roller 16 is rotatably supported by an arm 14 that is swingably attached to the Y rail 8, and the pressure roller 16 can elastically contact the drive roller 12 by the elastic force of a spring. Is becoming On the Y rail 8, a drawing head 20 holding a pen 18 and a casing of a cutting unit 22 are movably attached.

A rubber roller 26 and a round blade cutter 28 are rotatably supported by shafts 30 and 32 on an arm 24 fixed to the casing of the cutting unit 22. The lower part of the round blade cutter 28 has a cutter groove 34 formed in the platen 2 in the Y-axis direction (the direction perpendicular to the paper surface in FIG. 1).
It is located inside. The rubber roller 26 elastically contacts the upper surface of the platen 2 in the vicinity of the cutter groove 34, and is rotated by friction with the platen 2 or the sheet surface on the platen 2 as the cutting unit 22 moves along the Y rail 8. Is configured.

The rotation of the rubber roller 26 is transmitted to the round blade cutter 28 via a gear speed increasing mechanism. A detachable hook 36 is swingably supported on the cut unit 22 by a shaft 38, and a pin 40 slidably supported on the cut unit 22 is engaged immediately above one end of the hook 36. A solenoid 44 is fixed to the bracket 42 fixed to one side of the platen 2.

When the cutting unit 22 is moved to a predetermined standby position at the end of the Y rail 8, the pin 4 is moved.
The upper end of 0 is configured to be located immediately below the output shaft 46 of the solenoid 44. The detachable hook 36 is
It is biased counterclockwise in FIG. 3 by the spring 48. The drawing head 20 is provided with a hook receiver 50 for engaging with the detachable hook 36.

Reference numeral 52 designates the drawing head 2 on the platen 2.
Transparent covers for covering the zero movement range, and both ends of the transparent covers are supported by a machine frame 54 fixed to the machine body 6 so as to be rotatable around a shaft line parallel to the Y rail 8 as a shaft 56. Reference numeral 58 denotes a bracket fixed to the machine body 6, to which a link 60 is rotatably supported by a shaft 62.

Reference numeral 64 denotes a geared motor which is located in the platen 2 and is fixed to the machine body 6, and a circular eccentric cam 66 is fixed to the output shaft of the geared motor. The link 60
Is urged in the clockwise direction in FIG. 1 by an urging means (not shown) such as a spring or a gas coupling, and the lower portion of the link 60 is urged by the urging force.
I am in contact with 6.

Reference numeral 68 is an L-shaped link, one end of which is rotatably supported on the machine frame 54 by a shaft 56. The lower end of the link 68 is rotatably supported by one end of the intermediate link 70 by a shaft 72, and the other end of the intermediate link 70 is connected to the link 60.
A shaft 74 is rotatably supported on the upper part of the. Link 6
A micro switch 76 is fixed to the vertical portion of the switch 8, and a lower end surface 78a of a locking piece 78 protruding from the cover 52 is provided on the upper surface of the casing of the switch 76.
Abuts by its own weight. A projecting piece 80 is provided at the lower end of the locking piece 78, and the projecting piece 80 faces the movable switch shaft 82 of the switch 76 (see FIG. 2).

In a state in which the locking piece 78 is supported on the upper surface of the casing of the switch 76, the lower end 52a of the cover 52 faces the upper surface of the platen 2 with a slight gap. It is set so as to be in the shielding position (normally lowered position).

Next, the operation of this embodiment will be described. When a sheet is placed on the platen 2 and the plotting operation of the plotter 4 is started, the pressure roller 16 makes elastic contact with the drive roller 12 from above the sheet arranged on the platen 2, and the sheet on the platen 2 is The drive roller 12 and the pressure roller 16 hold it, and the drive roller 12 rotates in the forward and reverse directions to rotate the platen 2
The upper part is sent in the left-right direction (X-axis direction) in FIG. on the other hand,
While the pen 18 is controlled to move up and down with respect to the paper on the drawing roller 10, it moves along the Y rail 8 in the direction crossing the paper (Y
The paper is sent in the axial direction) and a predetermined drawing is performed on the paper by the pen 18.

When the drawing on the sheet on the platen 2 is completed, the sheet is moved on the platen 2 by the drive roller 12 and the portion to be cut on the sheet is moved to the cutter groove 34, and the sheet cutting operation is started. First, the controller drives the geared motor 64 to move the enlarged eccentric portion of the cam 66 by 180 degrees from the position facing the link 60, and causes the narrow eccentric portion of the cam 66 to face the link 60.

As a result, the link 60 swings clockwise in FIG. 1 about the shaft 62, and the intermediate link 70 is pushed to the right, and the pushing force causes the link 68 to center on the shaft 56. Swings counterclockwise. The switch 76 descends due to the counterclockwise swing of the link 68, and the cover 52 supported by the switch 76 swings counterclockwise about the shaft 56 by its own weight in FIG.
The lower end 52a of the cover 52 is pressed against the top surface of the platen 2 by its own weight over substantially the entire widthwise direction of the platen 2, and presses the paper against the top surface of the platen 2 near the front of the cutter groove 34.

The cover 52 is centered on the shaft 56, as shown in FIG.
It swings counterclockwise in the middle and its lower end 52a is at the platen 2.
When it reaches, the movable switch shaft 82 is pushed by the inclination of the protrusion 80, the switch 76 is turned on, and the cover lowering completion signal is input to the controller. Next, the controller energizes the solenoid 44 and pushes down the pin 40 to move the detachable hook 36 around the shaft 38 in FIG.
It swings clockwise and lifts the tip of the detachable hook 36.

Next, the head 20 is moved toward the end of the Y rail 8, and when the attachment / detachment hook receiver 50 is moved to the engagement position with the attachment / detachment hook 36, the Y rail 8 of the head 20 is moved.
The movement of the solenoid 44 is stopped, and the energization of the solenoid 44 is released. The attachment / detachment hook 36 swings counterclockwise in FIG. 3 by the pulling force of the spring 48, and the hook portion of the hook 36 and the hook receiver 50 are engaged with each other. Next, head 20
When the cutting unit 22 moves to the left along the rail 8 in FIG.
Move along.

As the unit 22 moves leftward along the Y rail 8 in FIG. 3, the rubber roller 26 rotates counterclockwise while pressing the sheet on the platen 2, and this rotation causes a gear speed-up mechanism. Is transmitted to the round blade cutter 28 via the round blade cutter 28 along the cutter groove 34,
The paper is cut in the moving direction of the head 20 while rotating in the same direction as the rotation direction of the rubber roller 26.

During cutting of the paper, the lower side 52a of the cover 52 supports the side of the already-cut portion of the paper opposite to the side supported by the drive roller 12 and the pressure roller 16 and hanging from the platen 2. Therefore, the paper is
The already cut portion does not shift downward due to the weight of the sheet, and the sheet is accurately cut by the cutter 28 along the cutter groove 34. It should be noted that the cover 52 is rotated about the shaft 56 by a manual operation in FIG. 1 from the shield position where the vertical portion of the cover 52 is substantially perpendicular to the floor surface, and is rotated substantially 100 degrees in the clockwise direction to rotate the platen. It is configured so that the upper part of the traveling portion of the second drawing head can be opened.

In the above embodiment, the cutting unit 22 is moved by using the driving force of the drawing head 20, but the cutting unit 22 is driven by a power source dedicated to the cutting unit 22. Is also good. Further, a mechanism for further lowering the cover 52 from the shield position where the lower end 52a of the cover 52 is slightly elevated from the platen 2 to the position where the lower end 52a of the cover 52 contacts the sheet on the platen 2 is provided with a link mechanism, a gear motor 64, and a cam 66. However, as shown in FIGS. 5 and 6, the mechanism may be manually operated. 5 and 6, the cover 52 has a lower end 52a.
Is locked by a stopper shaft 84 slidably inserted into the machine frame 54 at a normal lowered position, which is slightly raised from the platen, that is, a shielded position.

When the operator pulls the stopper shaft 84 in the direction away from the cover 52 against the force of the spring 86, the cover 52 loses its support and swings about its shaft 56 supporting portion by its own weight, and the cover 52 is released. The lower end of the sheet comes into contact with the platen from above the sheet by its own weight, and the lower end of the sheet comes into contact with the platen from above the sheet by its own weight.

[0024]

As described above, according to the present invention, the side of the cut portion of the sheet that hangs down from the platen is pressed by the lower end of the cover during the sheet cutting operation, so that accurate sheet cutting can be performed, and the platen can be pressed against the sheet retainer. Since the lower end of the cover that covers the entire width of the paper is used, there is an effect that it can hold all sizes of paper to be used.

[Brief description of drawings]

FIG. 1 is a side view of a plotter.

FIG. 2 is an enlarged side view.

FIG. 3 is a front view of the plotter.

FIG. 4 is an external view of a plotter.

FIG. 5 is a sectional view showing another embodiment.

FIG. 6 is an external view showing another embodiment of the cover.

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of Codes] 2 Platen 4 Plotter 6 Aircraft 8 Y Rail 10 Drawing Roller 12 Drive Roller 14 Arm 16 Pressure Roller 18 Pen 20 Drawing Line Head 22 Cutting Unit 24 Arm 26 Rubber Roller 28 Round Blade Cutter 30 Shaft 32 Shaft 34 Cutter Groove 36 Detachable Hook 38 Axis 40 Pin 42 Bracket 44 Solenoid 46 Output Shaft 48 Spring 50 Hook Receiver 52 Cover 54 Machine Frame 56 Axis 58 Bracket 60 Link 62 Axis 64 Motor 66 Cam 68 Link 70 Link 72 Axis 74 Axis 76 Switch 78 Locking Piece 80 Projection Piece 82 Switch Shaft 84 Stopper Shaft 86 Spring 88 Cutter 90 Paper 92 Pressure Roller

Claims (4)

[Claims] 1. A sheet placed on a platen 2 is nipped by a drive roller 12 and a pressure roller 16, and the drive roller 1
The paper is fed in the front-back direction of the platen 2 by the forward and reverse rotations of 2, while the pen 18 is moved in the direction traversing the paper to draw on the paper. After the drawing is completed, the cutter 28 is moved in the direction crossing the platen 2. In the paper-driven plotter configured to cut the paper on the platen 2, the cover 52 that covers substantially the entire area of the platen 2 in the widthwise direction is normally lowered with its lower end 52a slightly elevated with respect to the upper surface of the platen 2. From the position to the open position where the upper surface of the platen 2 is opened, the cover 52 is swingably supported by the machine body of the plotter, and the lower end 52a of the cover 52 forms a sheet with the sheet cutting portion of the platen 2 as a boundary. A paper pressing mechanism characterized by being capable of descending to a paper pressing position in contact with the upper surface of the platen 2 on the side opposite to the holding side. 2. The paper in the paper-driven plotter according to claim 1, wherein the lower end of the cover 52 is pressed against the upper surface of the platen platen 2 by its own weight at the paper pressing position to press the paper on the platen 2. Presser mechanism. 3. The cover 52 is linked to a driving device, and the driving device moves the cover 52 to the open position,
The paper pressing mechanism for a paper drive type plotter according to claim 1, wherein the paper pressing mechanism is controlled to a normal lowering position and a paper pressing position. 4. The locking means for locking the cover 52 urged in the descending direction at the normal descending position is provided, and the locking means can be manually released.
A paper pressing mechanism in the paper drive type plotter described in.