JPH054488A - Pressing mechanism for paper moving plotter paper - Google Patents

Abstract

PURPOSE:To prevent the paper pressing force between a driving roller and a pressing roller from transmitting to a Y rail and a platen box via the arm supporting such rollers and provide two shorter driving rollers adaptable to the various sizes of papers. CONSTITUTION:According to the size of paper, one supporting arm 52 is made to slide along a driving shaft relative to the other supporting arm and a driving roller 40 is made to slide along the driving shaft in conjunction with the supporting arm 52. A pressing arm 60 and a pressing roller 56 are moved in conjunction with the sliding movement of the driving roller 40 along the driving shaft. The force of a spring acting to bias the rear ends of the supporting arm 52 and the pressing arm 60 toward each other will not act on a Y rail or platen box supporting the supporting arm due to the scissors mechanism of both the arms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper moving mechanism for a paper moving plotter, that is, a paper drive type automatic drafting machine.

[0002]

2. Description of the Related Art In this type of paper moving plotter, in order to use papers of different sizes, there has been conventionally known a structure using a long drive roller which covers the entire area of the maximum paper size. The long drive roller is expensive because high accuracy is required so that it can be used uniformly over the entire area, and there is a defect that the roller bends when pressure is applied to the center of the roller. Further, since the weight is large, the inertia is increased, the motor for driving the inertia is increased, and it is necessary to increase the power of the motor driver and the power source.

In order to solve these problems, as shown in FIG. 5, a plurality of short drive rollers 2 corresponding to the paper size are provided, a bearing 4 is provided between the rollers 2, and a drive which is linked to a motor 6 is provided. Structures have been developed to prevent deflection of the shaft 8.

[0004]

However, the above configuration cannot cope with any paper size.
Further, the pressure from the pressure roller 10 that is pressed against the drive roller 2 acts on the platen box 12.

That is, although the platen box 12 is for supporting the platen, the sheet pressing force (3 kg or more) is transmitted to it. Further, the reaction force of the pressure of the pressure roller 10 is also transmitted to the Y rail side that supports the pressure arm. Therefore, the platen box and Y
Both sides of the rail needed to be strengthened. The present invention aims to solve these problems.

[0006]

In order to achieve the above object, the present invention supports a drive roller on a drive shaft rotatably supported by a platen box supporting the platen, and between the drive roller and the pressure roller. A method of sandwiching a sheet placed on the platen and feeding the sheet in the front-rear direction on the platen by the forward and reverse rotations of the drive roller, while traversing the sheet along a Y rail arranged on the platen. In a paper pressure mechanism of a paper moving plotter in which a pen is moved to a predetermined position to perform a predetermined drawing on the paper, the driving rollers are a pair of short rollers, and at least one driving roller of the pair of short rollers. Is slidable along the drive shaft, and the tip ends of a pair of support arms are rotatably mounted on the drive shaft and are positioned on both sides of the drive roller. At least one support arm of the pair of support arms is slidable along the drive shaft in conjunction with the one drive roller, and the pressure roller is provided in a pair corresponding to the drive roller. Each of the pressure rollers is rotatably attached to the tip of the pressure arm, and a substantially midpoint between the support arm and the pressure arm is rotatably supported so that both arms form a scissors structure. Each rear part of the pressure arm is biased by a spring in a direction in which the tips of the both arms approach each other, and a pressure shaft for opening the tips of the arms against the spring force is provided between the rear parts of the arms. The pair of support arms are rotatably arranged and are attached to the Y rails, or the pair of support arms are attached to the platen box, and at least one of the pair of support arms is In a direction parallel to the longitudinal direction of the rail is obtained by slidable.

[0007]

According to the sheet size, one support arm is slid with respect to the other support arm along the drive shaft, and the drive roller is slid along the drive shaft in cooperation with the support arm. The pressure arm and pressure roller move in conjunction with the sliding movement of the drive roller along the drive axis. The spring force that urges the rear portions of the support arm and the pressure arm toward each other does not act on the Y-rail supporting the support arm or the platen box due to the scissors structure of both arms.

[0008]

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. In FIG. 1, reference numeral 30 is a platen box supported by a machine body (not shown), to which a sheet placing plate, that is, a platen 32 is fixed. Driving shafts 34, 36 parallel to each other are rotatably supported between both side walls 30a, 30b of the platen box 30.

A drawing roller 38 is fixed to the drive shaft 34, and a pair of short drive rollers 39 and 40 having the same diameter as the drawing roller 38 are fitted near both ends of the drive shaft 36. As shown in FIG. 3, the drive rollers 39 and 40 rotate by friction in association with the rotation direction of the drive shaft 36 and are slidable in the axial direction.
It is fitted to the drive shaft 36 in a semi-fixed state via the shaft 4. As shown in FIG. 3B, the drive roller 40 is attached to the drive shaft 3 by the fixing screw 26 provided on the bush 24.
6 may be detachably fixed. One drive roller 39 does not need to be moved and adjusted with respect to the drive shaft 36 as a base point side, so it may be fixed to the drive shaft 36, or, like the other drive roller 40, it may be driven. It may be slidable with respect to the shaft 36.

The drive shafts 34 and 36 are connected to the output shaft of the X motor 42 via a power transmission mechanism, and are configured to rotate in the same direction at the same number of rotations by interlocking with each other. A Y rail 44 is installed above the platen 32 on the machine body, and an image line head 48 holding a pen 46 on the Y rail 44 is movably attached via a Y cursor (not shown). Has been. Part of the peripheral surfaces of the drawing roller 38 and the driving rollers 39, 40 are loosely fitted in a slit formed in the platen 32 in a direction parallel to the longitudinal direction of the Y rail 44.

Drive roller support arms 50 and 52 are provided between the side walls of the U-shaped tip portions of the drive rollers 3 and 3.
9 and 40 are rotatably arranged so that the drive rollers 39 and 40 move along the drive shaft 36 in conjunction with the parallel movement of the support arms 50 and 52 along the drive shaft 36. Is configured. Both side walls of the U-shaped end portions of the support arms 50 and 52 are rotatably and axially slidably fitted in the vicinity of both ends of the drive shaft 36. In the substantially U-shaped frame portion in the middle of each of the support arms 50, 52, the drive shaft 36 is provided with a substantially intermediate point of the pressure arms 58, 60 that rotatably support the pressure rollers 54, 56 at their ends.
Shafts 62 and 64 are rotatably supported about an axis parallel to the axis.

The support arms 50 and 52 and the pressure arm 5
8, 60 form a scissors structure. The support arms 50, 5 are provided near the rear ends of the pressure arms 58, 60.
The lower ends of shafts 66 and 68 that are transparently provided near the rear end of the second member 2 are fixed. The shaft body 6 is located between the enlarged upper end portions of the shaft bodies 66 and 68 and the upper surfaces of the support arms 58 and 60.
Coil springs 70 and 72 are compressed and fitted and arranged in the coils 6 and 68. The pressure roller 54 is pressed by a spring force that biases the rear ends of the support arms 50 and 52 and the rear ends of the pressure arms 58 and 60 of the coil springs 70 and 72 toward each other, that is, to close the scissors. , 56 are in elastic contact with the drive roller 40.

The mounting portion 74 at the rear of each of the support arms 50 and 52 is slidably mounted in a groove 45 formed in the Y rail 44 over the entire length in the longitudinal direction thereof. The support arm 50 on the one base point side may be fixed to the Y rail 44. Reference numeral 76 denotes a pressing shaft that is supported in the machine body in a vertical direction with a degree of freedom and is supported substantially parallel to the Y rail 44, and has an eccentric enlarged portion a and an eccentric narrow portion b. The pressure shaft 76 is disposed between the support arms 50, 52 and the rear facing portions of the pressure arms 58, 60, and the pressure shaft 76 is rotatable.

In the above-mentioned structure, the pressing shaft 76 is rotated by a predetermined angle manually or by a driving device such as a rotary solenoid so that the eccentric enlarged portion a of the pressing shaft 76 is supported by the support arm 5.
0, 52 and the pressure arms 58, 60 are opposed to each other, the eccentric bulging portion a pushes the support arms 50, 52 and the rear portions of the pressure arms 58, 60 against the elastic force of the springs 70, 72. The pressure rollers 54 and 56 are the drive rollers 3
It is separated from 9, 40 for a predetermined time. In this state, the paper 78 is inserted between the drive rollers 39 and 40 and the pressure rollers 54 and 56, and the paper 78 is placed on the platen 32.

Corresponding to the size of the paper 78 set on the platen 32, the other support arm 52 is manually slid along the drive shaft 36 with respect to the one support arm 50 and interlocked with the support arm 52. And drive roller 4
0 is slid along the drive shaft 36 to position the drive rollers 39 and 40 on both sides of the paper 78. The pressure arm 60 and the pressure roller 56 move in conjunction with the support arm 52 in conjunction with the sliding movement of the drive roller 40 along the drive shaft 36.

Next, the pressurizing shaft 76 is rotated by a predetermined angle manually or by a driving device so that the eccentric narrow portion b of the pressurizing shaft 76 faces the support arms 50 and 52 and the pressurizing arms 58 and 60, respectively.
The pressure of the pressure shaft 76 on the arms 50, 52, 58, 60 is released. As a result, the pressure rollers 54, 56
Is pressed against the drive rollers 39 and 40 from above the paper 78 by the springs 70 and 72, and the pressure roller 5 is applied to both sides of the paper 78.
4, 56 and the drive rollers 39, 40 are firmly held.

X motor 4 according to a command from the controller
2 to control the rotation of the drive roller 40 in the forward and reverse directions,
Paper 78 on platen 32 in X direction (left and right in FIG. 1)
Drive the Y motor to move the drawing head 48 to Y.
The paper 78 is fed along the rail 44 in the direction traversing the paper 78, that is, in the Y direction, and the paper 78 on the drawing roller 38 is moved by the pen 46.
Perform prescribed drawing on.

In the above structure, the paper holding force between the pressure rollers 54 and 56 and the driving roller 40 by the springs 70 and 72 is the support arms 50 and 52 and the pressure arms 58 and 60.
With the scissors structure, the mounting portion 7 of the support arms 50 and 52
It does not act on the Y-rail 44 that supports 4.

FIG. 4 shows the drive roller support arm 8 on the other side.
0 and a convex portion 84 provided along the Y-axis on the bottom portion of the platen box 82 fitted therein.
By this, the embodiment in which the support arm 80 on the other side is slidably supported on the platen box 82 along the Y-axis is disclosed. In the figure, 86 is a platen, 88 is a Y rail, 90 is a drawing head, 92 is a drive roller, 94 is a drawing roller, 96 is a pressure roller, 98 is a pressure arm, and 10 is a pressure roller.
Reference numeral 0 is a pressure shaft, 102 is a shaft body fixed to the pressure arm 98, and slidably fitted in a hole of the support arm 80.
Reference numeral 4 is a spring for pressing the pressing arm 98 and the support arm 80 in the closing direction, and 106 is a pen. The other structure is the same as that of the first embodiment.

In the above-mentioned structure, the elastic force of the spring urges the support arm 80 and the rear portion of the pressure arm 98 in the direction in which the support arm 80 and the pressure arm 98 are closed, that is, in the direction in which the scissors are closed. Press on 92.
The pressure-bonded state is released by pushing and expanding the rear portions of the support arm 80 and the pressure arm 98 by the eccentric bulge of the pressure shaft 100, and the pressure roller 96 is driven by the drive roller 92.
Isolate from the specified time.

[0021]

According to the present invention, as described above, the pair of support arms for supporting the drive roller and the pressure roller and the pressure arm are sandwiched, and the drive roller and the pressure roller are separated by the spring for urging both arms. Since the pressure is applied to each other, it is possible to prevent the reaction force of the pressing force of the drive roller and the pressure roller from acting on the Y rail or the platen box that supports at least one of the two arms. Further, it is possible to adapt to various paper sizes, there is no need for a bearing for the drive shaft, and there are the effects that only two drive rollers are required.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is an external view.

FIG. 3 is an external view.

FIG. 4 is a side view showing another embodiment.

FIG. 5 is a side view of the prior art.

[Explanation of symbols]

2 drive roller 4 bearings 6 motors 8 drive shafts 10 Pressure roller 12 Platen Box 30 platen box 32 Platen 34 Drive shaft 36 drive shaft 38 Drawing roller 39 Drive roller 40 drive roller 42 X motor 44 Y rail 46 pen 48 stroke head 50 support arm 52 Support arm 54 pressure roller 56 pressure roller 58 Pressure arm 60 pressure arm 62 holes 64 holes 66 shaft 68 Shaft 70 coil spring 72 coil spring 74 Mounting part 76 Pressure shaft 78 sheets 80 Support arm 82 Platen Box 84 convex 86 Platen 88 Y rail 90 stroke head 92 Drive roller 94 Drawing roller 96 pressure roller 98 Pressure arm 100 pressure shaft 102 shaft 104 spring 106 pen

Claims (2)

[Claims] 1. A platen box supporting a platen supports a drive roller rotatably supported by a drive shaft, and a sheet placed on the platen is sandwiched between the drive roller and a pressure roller. The paper is fed in the front-rear direction on the platen by the forward and reverse rotations of the drive roller, and the pen is moved in the direction traversing the paper along the Y rails arranged on the platen to draw a predetermined pattern on the paper. In the paper pressure mechanism of the paper moving plotter, the driving roller is a pair of short rollers, and at least one driving roller of the pair of short driving rollers is slidable along the driving shaft. The tip ends of a pair of support arms are rotatably attached to the shaft at both sides of the drive roller, and at least one of the pair of support arms is attached. The support arm of the above is slidable along the drive shaft in conjunction with the one drive roller,
A pair of the pressure roller is provided corresponding to the drive roller,
Each of the pressure rollers is rotatably attached to the tip of a pressure arm, and a substantially midpoint between the support arm and the pressure arm is rotatably supported so that both arms form a scissors structure. And a pressure shaft for urging each rear portion of the pressure arm by a spring in a direction in which the tips of the both arms approach each other, and opening the tips of the arms against the spring force between the rear portions of the arms. Is rotatably disposed, the pair of support arms are attached to the Y rail, and at least one of the pair of support arms is slidable along the longitudinal direction of the Y rail. Paper pressure mechanism. 2. A platen box supporting a platen supports a drive roller rotatably supported by a platen box, and a sheet placed on the platen is sandwiched between the drive roller and a pressure roller. The paper is fed in the front-rear direction on the platen by the forward and reverse rotations of the drive roller, and the pen is moved in the direction traversing the paper along the Y rails arranged on the platen to draw a predetermined pattern on the paper. In the paper pressure mechanism of the paper moving plotter, the driving roller is a pair of short rollers, and at least one driving roller of the pair of short driving rollers is slidable along the driving shaft. The tip ends of a pair of support arms are rotatably attached to the shaft at both sides of the drive roller, and at least one of the pair of support arms is attached. The support arm of the above is slidable along the drive shaft in conjunction with the one drive roller,
A pair of the pressure roller is provided corresponding to the drive roller,
Each of the pressure rollers is rotatably attached to the tip of a pressure arm, and a substantially midpoint between the support arm and the pressure arm is rotatably supported so that both arms form a scissors structure. And a pressure shaft for urging each rear part of the pressure arm by a spring in a direction in which the tips of the both arms approach each other, and opening the tips of the both arms against the spring force between the rear parts of the both arms. Is rotatably disposed, the pair of support arms is attached to the platen box, and at least one of the pair of support arms is slidable in a direction parallel to the longitudinal direction of the Y rail. Paper pressure mechanism for paper moving plotter.