JPH05254194A - Paper pressing mechanism for image forming device - Google Patents

Abstract

PURPOSE:To avoid deviation of a cut part of a paper occurring due to weight of the paper when the paper is to be cut by a cutter. CONSTITUTION:When a cutter 28 is moved in the direction crossing a platen 2 so as to cut a paper on the platen 2, a presser belt 54 is delivered on the platen 2 from a belt case 52 following the movement of a cut unit 22. The bottom face of the presser belt 54 presses the paper on the platen 2 to the platen 2 so as to avoid deviation from the platen 2 when the paper is being cut. A pressing position of the bottom face of the presser belt 54 for the paper is set on an opposite side of the paper pinching side of a drive roller 12 and a pressure roller based on a cutting part of the paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a paper drive type plotter having a paper cutting mechanism, and more particularly to a paper pressing mechanism for cutting a paper.

[0002]

2. Description of the Related Art In a plotter, a head and a cutting unit are engaged with each other, the cutting unit is moved in a direction traversing the sheet, and the sheet is cut along a cutting groove of a sheet mounting plate. No. 178194.

[0003]

In the above-mentioned conventional apparatus, as shown in FIG. 9, 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 holds a sheet guided by a sheet support by a pinch roller mechanism and rotates the drive roller of the pinch roller mechanism to rotate the sheet. While feeding the paper along the paper support in a predetermined direction,
Draw on the paper by drawing means, and after drawing,
In a paper pressing mechanism of an image forming apparatus in which a cutter is moved in a direction traversing a paper support to cut the paper supported by the paper support, a belt case and the belt case
One of the belt case and the tip of the holding belt of the belt feeding means comprising an elastic holding belt that is biased in the direction of being drawn into the case and can be pulled out from the case. The cutter is connected to the holding side, and the other side is disposed on the side of the sheet support 2, and the press belt is followed by the pinch roller with the cutter as a reference following the movement of the cutter. The paper is fed onto a paper support on the side opposite to the holding side, and the paper on the paper support is held by the holding belt.

[0005]

When the paper is being cut, the presser belt is drawn out from the belt case onto the paper support in accordance with the movement of the cutter, and the side of the paper that hangs down from the paper support is pressed by the press belt to prevent the misalignment of the paper. It

[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
Is a platen (sheet support) fixed to the machine body, and a Y rail 8 is provided above the machine body and is located above the platen. Inside the platen 2, a drawing roller 10 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 on the platen 2 in the Y-axis direction. It is arranged in the formed slit.

The rollers 10 and 12 are rotatably supported on the machine body. 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
The Y-rail 8 has a drawing head 2 that holds a pen 18.
0 and the casing of the cut unit 22 are movably attached. The movement of the drawing head 20 along the Y rail 8 is configured to be performed by a Y-axis driving device.

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. 4).
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 P 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 fitting recess 41 formed in the head portion of 0 is located immediately below the output shaft 46 of the solenoid 44. The detachable hook 36 is attached by a spring 48 in FIG.
It is biased counterclockwise. The drawing head 20 has a hook receiver 5 for engaging the detachable hook 36.
0 is provided. Reference numeral 64 denotes a sensor composed of a micro switch. The sensor 64 is fixedly mounted on the Y rail 8 and when the cutting unit 22 is at the standby position, O
When it becomes N, and moves from the standby position to the left in FIG. 2, it becomes OFF and informs the controller whether or not the cutting unit 22 is at the standby position.

Reference numeral 52 designates a case of a belt feeding means, and a shaft 56 is rotatably supported on the case.
The shaft 56 is provided with reels 60 and 62, and the reel 60 supports a holding belt 54 which is wound in a spiral shape and has elasticity and flexibility. One end of the holding belt 54 is fixed to the shaft 56 with a screw 55 as shown in FIG. A spiral spring 58 is arranged on the reel 62, and one end of the spring 58 is inserted into a slit of the shaft 56 and locked in the slit, as shown in FIG. The other end of the spring 58 is fixed to the belt case 52. The spring 58 urges the shaft 56 in a direction in which the pressing belt 54 is wound.

The belt case 52 is fixedly arranged on a side portion of the platen 2, and the other of the belts 54 is a belt case.
It is pulled out from the slit of the slot 52 and fixed to the lower surface of the arm 24 of the cutting unit 22. The feeding portion of the belt 54 from the case 52 is set parallel to the moving direction of the cutting unit 22, and the lower surface of the belt 54 is disposed in the vicinity of the upper surface of the platen 2 so that the paper on the upper surface of the platen 2 is placed. It is arranged to be crimped. Further, the feeding and retreating path of the pressing belt 54 following the movement of the cutting unit 22 is on the opposite side of the sheet holding side by the drive roller 12 and the pressure roller 16 with the cutter 28 as a reference. It is set on the platen 2 of.

Next, the operation of this embodiment will be described. When the sheet P is placed on the platen 2 and the pressure roller 16 is elastically brought into contact with the drive roller 12 from above the sheet placed on the platen 2, the plotter 4 starts the drawing operation. The sheet of paper is sandwiched between the drive roller 12 and the pressure roller 16, and is fed in the left-right direction (X-axis direction) on the platen 2 in FIG. 4 by the forward and reverse rotations of the drive roller 12. 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, the pen 18 is fed along the Y rail 8 in a direction crossing the paper P (Y-axis direction), and the pen 18 performs predetermined drawing on the paper. Be done.

When the drawing on the sheet P on the platen 2 is completed, the sheet is moved on the platen 2 by the driving roller 12 and the portion to be cut on the sheet is moved on the cutter groove 34 to shift to the sheet cutting operation. .. First, the controller energizes the solenoid 44 and pushes down the pin 40,
In FIG. 2, the detachable hook 36 is swung clockwise around a shaft 38 to lift 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. 2 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 moving leftward in FIG. 2 along the rail 8, the cutting unit 22 interlocks with the head 20 and moves along the Y rail 8
Move along.

Further, when the unit 22 moves leftward along the Y rail 8 in FIG. 2, the rubber roller 26 rotates counterclockwise while pressing the sheet on the platen 2, and this rotation causes a gear speed increasing mechanism. Is transmitted to the round blade cutter 28 via the round blade cutter 28 along the cutter groove 34,
The paper P 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.

While the paper is being cut, the pressing belt 54 is fed out from the belt case 52 onto the platen 2 by the movement of the cutting unit 22, and the side of the cut portion of the paper which is supported by the drive roller 12 and the pressure roller 16. The opposite side, which hangs from the platen 2, is supported by the pressing belt 54. Therefore, the cut portion of the sheet does not shift downward due to the weight of the sheet during cutting, and the sheet is cut accurately by the cutter 28 along the cutter groove 34.
After cutting the paper, the cutter unit 22 moves the drawing head 2
When pushed to 0 and returned to the home position, that is, to the standby position, the belt 54 is wound around the shaft 56 by the elastic force of the spring 58 in the case 52, following the return movement of the cutter unit 22. The linear state of the presser belt 54 on the upper part 2 is maintained.

When the cutter unit 22 reaches the home position, that is, the standby position, the movement of the drawing head 20 is stopped. Next, the sensor 79 is activated (ON), the solenoid 44 is energized, the output shaft 46 projects, and the output shaft 46
Engages with the fitting recess 41 of the head of the pin 40 of the cutter unit 22 and pushes down the pin 40. When the lower end of the pin 40 presses one end of the detachable hook 36, the detachable hook 36 rotates clockwise in FIG. 2 against the force of the spring 48, whereby the detachable hook 36 of the cutter unit 22 and The engagement and disengagement hook receiver 50 of the drawing head 20 is disengaged. The engagement between the output shaft 46 of the solenoid 44 and the pin 40 prevents the cutter unit 22 from being displaced from the home position.

In the above embodiment, the movement of the cutting unit 22 is carried out by utilizing 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. In addition, the above embodiment,
The tip of the presser belt 54 is connected to the cutting unit 22 side, and the belt case 52 is arranged on the side of the platen body on the side of the platen body, but the reverse, that is, the belt case 52 is arranged in the cutting unit. Alternatively, the tip end of the presser belt 54 may be fixed to the platen body side by connecting to the 22 side.

In each of the above-mentioned embodiments, the paper pressing mechanism of the present invention is provided in the image forming apparatus for forming an image on a sheet with a pen. However, a known raster plotter or a known inject plotter or a known one is known. It can also be applied to plotters that use serial heads such as thermal sensitivity and dot impact.

FIG. 10 shows an embodiment in which the present invention is applied to an injet plotter. Platen roller 320
The pressing roller 322 constitutes a pinch roller mechanism. The paper P fed from the paper roll 324 is between the platen roller 320 and the pressing roller 323, between the platen roller 320 and the pressing roller 322, and the paper support 3
The sheet is guided to the sheet discharge port 328 of the injet plotter through the sheet guide surface 26.

An image is formed on the sheet P on the platen roller 320 by the inject head 330.
At the time of drawing, the inject head 330 is fed in the Y-axis direction along the rail 332, and the paper P is fed in the X-axis direction by the rotation of the platen roller 320. When the image formation on the sheet P on the platen roller 320 is completed, the cutter unit 122 is connected to the inkjet head 330 under the control of the controller, and the cutter unit 122 is driven along the rail 332 to cause the cutter unit 122 to move to the sheet. Move across P.

At this time, the paper P is cut by the round blade cutter 128. When cutting this paper, the cutting unit 12
By the movement of 2, the pressing belt 254 is fed from the belt case (not shown) to the paper support 326, and the paper P is pressed against the paper support 326 by the pressing belt 254. In this embodiment, the cutting unit 122
And a mechanism for connecting the inkjet head 330 and the paper pressing mechanism by the pressing belt 254 are the same as those in the embodiment shown in FIGS.

[0024]

As described above, according to the present invention, the cut paper is fixed on the paper support at the lower surface of the holding belt, so that the paper can be cut accurately.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a plotter.

FIG. 2 is a front view of the main part of the plotter.

FIG. 3 is a sectional view.

FIG. 4 is a side view of the plotter.

FIG. 5 is an external view of a main part.

FIG. 6 is a plan view of belt feeding means.

FIG. 7 is a side view of belt feeding means.

FIG. 8 is a side view of belt feeding means.

FIG. 9 is an explanatory diagram of a conventional technique.

FIG. 10 is a side view of an inkjet plotter showing another embodiment of the present invention.

FIG. 11 is an external view of the same.

FIG. 12 is a front view of the same.

[Explanation of symbols]

 2 Platen 4 Plotter 8 Y Rail 10 Drawing Roller 12 Drive Roller 14 Arm 16 Pressure Roller 18 Pen 20 Drawing Line Head 22 Cut Unit 24 Arm 26 Rubber Roller 28 Round Blade Cutter 30 Shaft 32 32 Shaft 34 Cutter Groove 36 Detach Hook 38 Shaft 40 Pin 42 bracket 44 solenoid 46 output shaft 48 spring 50 hook receiver 52 belt case 54 presser belt 56 shaft 58 spiral spring 60 reel 62 reel

Claims (1)

[Claims] 1. A sheet guided by a sheet support is held by a pinch roller mechanism, and the sheet is sent in a predetermined direction along the sheet support by rotation of a drive roller of the pinch roller mechanism. Draw on the paper by the means, and after drawing, move the cutter across the paper support,
In a paper pressing mechanism of an image forming apparatus that cuts a paper supported by a paper support, a belt case and an elastic force that is urged in a direction to be drawn into the belt case and can be pulled out from the case. One of the belt case and the tip of the pressing belt of the belt feeding means including a flexible pressing belt is connected to the side for holding the cutter, and the other side of the sheet support 2 is connected. The press belt is fed out on the paper support on the side opposite to the paper holding side by the pinch roller with the cutter as a reference, following the movement of the cutter. A paper pressing mechanism for an image forming apparatus, wherein the paper is pressed by the pressing belt.