JP2578746Y2 - Paper press mechanism of paper-pving plotter - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

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

In order to solve these problems, as shown in FIG. 4, 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 6 linked to a motor 6 is provided. Arrangements have been developed to prevent deflection of the shaft 8.

[0004]

However, in the above configuration, the pressure from the pressure roller 10 which 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 pressure (3 kg or more) is transmitted to the platen box 12. Also, the reaction force of the pressure of the pressure roller 10 is transmitted to the Y-rail supporting the pressure arm. Therefore, the platen box and Y
Both rail reinforcements were needed. The purpose of the present invention is to solve these problems.

[0006]

According to the present invention, at least a pair of short drive rollers are supported on a drive shaft rotatably supported by a platen box supporting a platen. A sheet placed on the platen is sandwiched between the pressure roller and the pressing roller, and the sheet is fed forward and backward on the platen by forward / reverse rotation of the drive roller, while a Y rail disposed on the platen wherein the sheet pressure mechanism of the paper moving plotter as by moving the pen in the direction transverse to the paper performs a predetermined drawing in the paper, substantially each of the pair of support arms having a roller receiving the tip along the A substantially intermediate point of a pressure arm having a pressure roller attached to the tip at the intermediate point is rotatably supported so that the two arms have a scissor structure, and the lower arm of the pair of support arms A receiver is disposed below the drive roller, and the rear portions of the support arm and the pressure arm are biased by springs in a direction in which the tips of the two arms approach each other. A pressure shaft for widening the ends of both arms is rotatably arranged, and the pair of support arms is attached to the Y-rail, or the pair of support arms is attached to the platen box. is there.

[0007]

The spring force for urging the rear portions of the support arm and the pressure arm toward each other does not act on the Y-rail or the platen box supporting the support arm due to the scissor structure of both arms.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction 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 denotes a platen box supported by a machine body (not shown), and a sheet mounting plate, that is, a platen 32 is fixed to the platen box. Drive 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 plurality of short drive rollers 3 having the same diameter as the drawing roller 38 are provided near both ends and an intermediate portion of the drive shaft 36.
9, 43, 41, and 40 are fitted and fixed corresponding to various paper widths.

The drive shafts 34 and 36 are connected to an output shaft of an X motor 42 via a power transmission mechanism, and are configured to rotate at the same rotational speed in the same direction in conjunction with each other. A Y-rail 44 is provided on the body above the platen 32, and an object head 48 holding a pen 46 is movably attached to the Y-rail 44 via a Y cursor (not shown). Have been. Part of the peripheral surfaces of the drawing roller 38 and the driving rollers 39, 43, 41, 40 are loosely fitted in slits formed on the platen 32 in a direction parallel to the longitudinal direction of the Y rail 44. .

Reference numerals 50 and 52 denote a pair of drive roller support arms, and flat plate-shaped roller receivers 50a and 52a are formed at the tips. Roller receiver 50 of one support arm 50
a is disposed in contact with a lower end of the driving roller 39 at one end of the driving shaft 36, and a roller receiver 52a of the other supporting arm 52 is provided.
Are movably arranged on the lower surface arrangement line of the drive rollers 41, 40, 43. The support arms 50, 52
Each of the substantially middle U-shaped frame portions has a pressure roller 5
Approximately midpoints of pressure arms 58 and 60 rotatably supporting the shafts 4 and 56 are rotatably supported on shafts 62 and 64 about an axis parallel to the drive shaft 36.

The support arms 50 and 52 and the pressure arm 5
8, 60 constitute a scissor structure. Near the rear ends of the pressure arms 58, 60, the support arms 50, 5
The lower ends of the shaft bodies 66 and 68 provided near the rear end of the shaft 2 are fixed. The shaft body 6 is located between the upper end enlarged portion 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 to 6, 68, respectively. The pressure rollers 54 are urged by the coil springs 70, 72 in a direction in which the rear ends of the support arms 50, 52 and the pressure arms 58, 60 approach each other, ie, close the scissors. , 56 are in elastic contact with the lower drive rollers 39, 40.

A mounting portion 74 at the rear of each of the support arms 50 and 52 is slidably mounted in a groove 45 formed on the Y rail 44 over its entire length in the longitudinal direction. Note that the support arm 50 on one base point side may be fixed to the Y rail 44. Reference numeral 76 denotes a pressurizing shaft which is supported on the machine body substantially in parallel with the Y rail 44 with a degree of freedom in the vertical direction, and has a large eccentric portion a and a small eccentric portion b. The pressing shaft 76 is disposed between the support arms 50 and 52 and the opposing portions behind the pressing arms 58 and 60, and the pressing shaft 76 is rotatable. The platen 32
Is provided with a slit 33 for allowing the support arm 52 to move along the Y-rail 44.

In the above configuration, the pressing shaft 76 is rotated by a predetermined angle manually or by a driving device such as a rotary solenoid, and the eccentric enlarged portion a of the pressing shaft 76 is supported by the support arm 5.
When the support arms 50 and 52 and the pressure arms 58 and 60 are opposed by the eccentric enlarged portions a, the rear portions of the support arms 50 and 52 and the pressure arms 58 and 60 are pushed and expanded against the elasticity of the springs 70 and 72. The pressing rollers 54 and 56 are separated from the opposing driving rollers, for example, 39 and 43 by a predetermined distance. In this state, the paper 78 is inserted between the driving roller 39 and the pressure roller 54 with one side thereof aligned with the driving roller 39 with the driving roller 39 as a reference, and the paper 78 is placed on the platen 32. Place.

According 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 The roller receiver 52a is arranged below the desired drive roller, for example 40;

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

The X motor 4 is controlled by a command from the controller.
2 to control the rotation of the drive shafts 34 and 36 in the forward and reverse directions to feed the paper 78 in the X direction (left and right directions in FIG. 1) on the platen 32, while driving the Y motor to
Is sent along the Y rail 44 in a direction crossing the sheet 78, that is, in the Y direction, and a predetermined drawing is performed on the sheet 78 on the drawing roller 38 by the pen 46.

In the above-described configuration, the force between the pressure rollers 54 and 56 and the drive roller 40 by the springs 70 and 72 is determined by the support arms 50 and 52 and the pressure arms 58 and 60.
The mounting portions 7 of the support arms 50 and 52 are
4 does not act on the Y-rail 44 supporting it.

FIG. 3 shows the driving roller support arm 8 on the other side.
This embodiment discloses an embodiment in which 0 is slidably supported by a slit 84 formed in the Y-axis direction of a platen box 82. In the figure, 80a is a roller receiver, 86 is a platen, 88 is a Y rail, 90 is an image head, 92 is a driving roller, 94 is a drawing roller, 96 is a pressing roller, 98 is a pressing arm, 100 is a pressing arm. A pressure shaft, 102 is a pressure arm 98
, And a shaft 104 slidably fitted in the hole of the support arm 80, the shaft 104 being a pressing arm 98 and a support arm 80.
A spring that presses in the closing direction, 106 is a pen. 9
Reference numeral 9 denotes a slit formed on a platen for enabling the pressing arm 98 to move in the Y-axis direction. Other structures are the same as those of the first embodiment.

In the above-described configuration, the rear portions of the support arm 80 and the pressure arm 98 are urged in the direction in which the scissors are closed, ie, the scissors are closed, by the elastic force of the spring. Crimping to 92.
This pressed state is released by pushing and expanding the rear portions of the support arm 80 and the pressure arm 98 by the eccentric enlarged portion of the pressure shaft 100, and the pressure roller 96 is driven by the drive roller 92.
From a predetermined distance.

[0021]

According to the present invention, as described above, a pair of supporting arms and a pressing arm for supporting the driving roller and the pressing roller are sandwiched, and the driving roller and the pressing roller are biased by a 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 driving roller and the pressing roller from acting on the Y-rail or the platen box supporting at least one of the two arms. Further, there is an effect that a bearing for the drive shaft is not required, and that the deflection of the drive shaft can be prevented by the support force of the roller receiver.

[Brief description of the drawings]

FIG. 1 is a side view.

FIG. 2 is an external view.

FIG. 3 is a side view showing another embodiment.

FIG. 4 is a side view of the prior art.

[Explanation of symbols]

 2 Drive Roller 4 Bearing 6 Motor 8 Drive Shaft 10 Press Roller 12 Platen Box 30 Platen Box 32 Platen 34 Drive Shaft 36 Drive Shaft 38 Drawing Roller 39 Drive Roller 40 Drive Roller 41 Drive Roller 43 Drive Roller 42 X motor 44 Y rail 46 Pen 48 Object head 50 Support arm 52 Support arm 54 Pressure roller 56 Pressure roller 58 Pressure arm 60 Pressure arm 66 Shaft 68 Shaft 70 Coil spring 72 Coil spring 74 Mounting part 76 Addition Pressure shaft 78 Paper 80 Support arm 82 Platen box 86 Platen 88 Y rail 90 Image head 92 Drive roller 94 Drawing roller 96 Pressure roller 98 Pressure arm 100 Pressure shaft 102 Shaft 104 Spring 106 Pen

Claims (4)

(57) [Scope of request for utility model registration] 1. A sheet mounted on a platen between a driving roller and a pressure roller, wherein at least a pair of short driving rollers are supported on a driving shaft rotatably supported by a platen box supporting the platen. scissors on both sides, one being sent to the front-rear direction the paper on the platen by the normal and reverse rotation of the drive roller to move the pen in the direction crossing the sheet along the Y rails disposed on said platen In a paper pressing mechanism of a paper moving plotter configured to perform a predetermined drawing on the paper, a pressure roller having a pressure roller attached to a tip thereof at a substantially middle point of each of a pair of support arms having a roller receiver at the tip. A substantially middle point of the arms is rotatably supported so that the two arms have a scissor structure, and a roller receiver of the pair of support arms is disposed below the driving roller. Biasing each rear part of the holding arm and the pressure arm by a spring in a direction in which the tips of the two arms approach,
A paper wherein a pair of supporting arms are rotatably arranged at the rear portions of the two arms to extend the ends of the two arms against the spring force, and the pair of support arms are attached to the Y rail. Paper press mechanism of moving plotter. 2. The drive shaft supports three or more short drive rollers, and a roller receiver of one of the pair of support arms is provided below a drive roller located at one end of the drive shaft. And the roller receiver of the other support arm is arranged on the lower surface arrangement line of the drive roller, and the other support arm of the pair of support arms can be slid along the longitudinal direction of the Y rail. The paper pressing mechanism of the paper moving plotter according to claim 1, wherein: 3. A sheet mounted on a platen between a driving roller and a pressure roller, wherein at least a pair of short driving rollers are supported on a driving shaft rotatably supported by a platen box supporting the platen. scissors on both sides, one being sent to the front-rear direction the paper on the platen by the normal and reverse rotation of the drive roller to move the pen in the direction crossing the sheet along the Y rails disposed on said platen In a paper pressing mechanism of a paper moving plotter configured to perform a predetermined drawing on the paper, a pressure roller having a pressure roller attached to a tip thereof at a substantially middle point of each of a pair of support arms having a roller receiver at the tip. A substantially middle point of the arms is rotatably supported so that the two arms have a scissor structure, and a roller receiver of the pair of support arms is disposed below the driving roller. Biasing each rear part of the holding arm and the pressure arm by a spring in a direction in which the tips of the two arms approach,
A paper characterized in that a pressurizing shaft for expanding the ends of the two arms against the spring force is rotatably arranged at the rear portions of the two arms, and the pair of support arms are attached to the platen box. Paper press mechanism of moving plotter. 4. A drive roller supporting three or more short drive rollers on the drive shaft and receiving a roller receiver of one of the pair of support arms on one end side of the drive shaft. And the roller receiver of the other support arm is arranged on the lower surface arrangement line of the drive roller, and the other support arm of the pair of support arms can be slid along the longitudinal direction of the Y rail. The paper pressing mechanism of the paper moving plotter according to claim 3, wherein: