JPH0252843A - Meandering detecting device and meandering correcting method - Google Patents

Abstract

PURPOSE:To perform accurate detection of meandering and easy correction of meandering by a method wherein inclination of a roller following slackness occurring due to meandering of a sheet form substance is detected as the rotation angle of a pivotally-supported arm, torque of a brake is changed to regulate the tension of the two ends in the direction of width of a recording material. CONSTITUTION:When a heat-sensitive sheet D meanders, slackness is generated on the one side in the direction of width, a small roller 160 following the heat-sensitive sheet D is inclined, and an arm 162 is rotated. In which case, the one encoder 164 detects the rotation angle of the arm 162 to detect meandering of the heat-sensitive sheet D. When meandering detecting device 136 detects meandering of the heat-sensitive D, control device controls braking of a brake 142 to regulate tension exerted on the heat-sensitive sheet D by a brake roller 138, and the heat-sensitive sheet D is conveyed to a proper conveyance passage by means of a roller 82. Namely, when the magnitudes of the tension of the two end parts in the direction of width of the heat-sensitive sheet D are differed from each other, the heat-sensitive sheet D is moved in the direction of width so that the one tension is made equal to the other tension being higher as it is conveyed by means of the roller 82, and a running passage is straightened.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a meandering detection device and a meandering correction method in an apparatus for conveying a sheet-like object, and more particularly, to a meandering detection device and a meandering correction method for a device that conveys a sheet-like object, and more particularly, to CAD (
The present invention relates to a meandering detection device and a meandering correction method for recording devices that are effective for computer-aided automatic drafting devices and the like.

[Conventional technology]

As devices for recording on AO recording paper, printing devices using a photographic method, recording devices using an electrostatic recording method, etc. are well known and are used in a variety of fields.

Further, CAD has been put into practical use to facilitate the creation of design drawings, and various recording devices for use therein have also been proposed.

When recording on a large-sized recording paper such as an AU version, it is not preferable to perform simultaneous recording on the entire surface because the configuration of the recording device becomes complicated. It is done by doing.

For example, a recording device using an electrostatic recording method includes a charging member having a main scanning length approximately equal to the width of the recording paper, charges the recording paper to form a latent image, and causes toner or ink droplets to adhere to the latent image. An image is formed using the images.

[Problem to be solved by the invention]

For example, when thermal paper is used as the recording material, printing is performed by relatively sub-scanning the thermal paper with a thermal head having a predetermined main scanning length. In a recording device where the thermal head is divided into multiple parts along the main scanning direction, these are arranged in multiple rows, and one line is printed by RAD to all the thermal paper while conveying the thermal paper, the thermal head The sub-scanning direction of the thermal head or thermal paper must match the moving direction of the thermal head or thermal paper.

However, if the conveyance path of the recording material is long, the slight meandering in the upstream direction of conveyance will be magnified downstream, and the sub-scanning direction of the thermal head will not match the conveyance direction of the recording material, resulting in accurate printing in the print recording section. The problem is that it cannot be done.

A first object of the present invention is to solve the above-mentioned problems, and to provide a device that accurately detects meandering in order to accurately convey a sheet-like object.

A second object of the present invention is to provide a method for easily correcting meandering in order to perform accurate print recording.

[Means and operations for solving the problems] The first object of the present invention is to provide a meandering detection device for a device for stretching and conveying a sheet-like object, which At least one roller placed on the upper surface of the sheet-like body, an angle detector connected to a rotation fulcrum shaft of the arm, and the arm is simultaneously rotated so that the roller contacts the sheet-like body with a predetermined pressure. This is achieved by a meandering detection device comprising a moving drive means.

In other words, when the amount of slack in the sheet changes due to meandering, the roller in contact with the top surface of the sheet also follows and changes the angle of the arm, so meandering can be prevented by detecting changes in the angle of the arm that supports the roller. Can be detected accurately.

The second object of the present invention is to provide a recording medium in which a plurality of printing means each having a predetermined main scanning length and performing sub-scanning along the recording material conveyance direction are provided in a plurality of rows, and the recording material is conveyed by a pair of rollers. A method for correcting meandering of a recording material in an apparatus, wherein brake rollers disposed at both widthwise ends of the recording material apply tension to the recording material being conveyed in a direction opposite to the conveying direction, thereby correcting the meandering of the recording material. This is achieved by a meandering correction method characterized by increasing or decreasing the tension applied by the brake roller depending on the amount.

That is, by increasing or decreasing the torque of the brake roller according to the amount of meandering of the recording material and controlling the load on both ends of the recording material in the width direction, meandering can be electrically corrected.
Accurate records can be made.

The sheet-like body and recording material used in the present invention are:
Any material may be used, such as a heat-sensitive recording material. The heat-sensitive recording material may be any material, such as paper or plastic film, as long as printing can be performed by heating.

[Dear Hibiki]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a schematic diagram of a recording apparatus using thermal recording paper.

This recording device prints and records on AO-size thermal paper based on an image signal processed by an image processing device (not shown) such as a computer.

The recording device consists of a thermal paper accommodating section i0 that accommodates a roll of thermal paper, and a print recording section 40 that performs printing and recording on the thermal paper fed out from the accommodating section 10.

The thermal paper in the storage section 10 has a width of 914 mm and is wound around the winding core 12 to a length of 200 m.

In the accommodating section 10, an upper housing 14 is rotatably supported by a shaft 16, and the accommodating section 10 can be opened when loading or unloading thermal paper.

The housing section 10 is provided with a motor 20 for rotationally driving a shaft 18 to which the winding core 12 is fixed, and the winding core 12 is rotationally driven by the motor 20 via a belt 22 stretched between the two. Ru. Further, in the storage section 10, a conveyance roller is provided for feeding out the thermal paper wound around the core 12 and conveying it to the front (hereinafter, "front" refers to the downstream direction in the traveling direction of the thermal paper, etc.). 24, 26 and the conveyance roller 24,
A motor 28 is provided for rotationally driving 26. The conveyor rollers 24 and 26 are connected to a belt 30 stretched between the ends of the conveyor rollers 24 and 26 and the output shaft of the motor 28.
It is rotationally driven by a motor 28 via. Further, a vertically movable dancer roller 32 is provided between the conveyance rollers 24 and 26 so as to be in contact with the upper surface of the thermal paper to adjust the tension of the thermal paper.

Note that the conveyance rollers 24 and 26 and the dancer roller 32 located above are provided integrally with the upper housing 14 and move together when the upper housing 14 rotates.

The print recording unit 40 includes two rows of thermal heads 42 and 44 arranged at a predetermined interval on the conveyance path of the thermal paper, and the thermal heads 42 and 44 are electrically connected to the image processing device. Printing is performed on thermal paper based on the image signal.

Platen rollers 46, 48 are provided below each thermal head 42, 44. the platen roller 46,
48 is a gear 50, a one-way clutch 52, and a belt 5
4 and is rotated by a motor 56 as necessary. Also, the support members 60. of the thermal heads 42.44.
62 is rotatable about an axis 64.66, and an eccentric cam 68.70 abuts on the support member 60.62.

Further, the print recording section 40 is equipped with a conveyance roller 72 for conveying the thermal paper from the storage section 10 toward the thermal head 42, 44, and the conveyance roller 72 is connected to a gear 74, a clutch 76, and a belt. Motor 8 via 78
Rotationally driven by 0. In addition, the thermal head 42.
44 is provided with a conveyance roller 82 for accurately feeding the printed thermal paper from the print recording section 40, and the conveyance roller 82 is rotationally driven by a motor 86 via a gear 84. Here, the conveyance roller 82 located above
is supported by a rotating member 90 that rotates about a shaft 88, and by rotating the rotating member 90, it can easily come into contact with and separate from the lower conveyance roller 82.

The upper housing 92 of the print recording section 40 is rotatably supported by a shaft 95, and the print recording section 40 can be opened when thermal paper jams during printing.

Note that the conveyance roller 72 located above is provided integrally with the upper housing 92 and moves together when the upper housing 92 rotates.

Further, the printing and recording section 40 is provided with a discharge table 94 for discharging the thermal paper after printing and recording.

Furthermore, a fixing device 98 consisting of a plurality of lamps 96 is provided above the discharge table 94 as necessary, and fixes the image onto the thermal paper by irradiating light onto the printing surface of the thermal paper. Furthermore, a cutter 100 for cutting the thermal paper is provided at the front end of the discharge table 94. The ejection table 94, fixing device 98, and cutter 100 are integrally constructed, and the ejection table 94 is rotatably supported by a shaft 102. When the recording device is not in operation, the ejection table 94 can be rotated clockwise in the figure to overlap the front surface of the print recording section 40.

To load thermal paper into this recording device, first
Then, the upper housing 14.92 of the print recording section 40 is rotated to expose the thermal paper conveyance path.

Next, the rotary member 90 in the print recording section 40 is rotated to separate the pair of conveying rollers 82 , position the front end of the thermal paper in the width direction, and sandwich it between the pair of conveying rollers 82 . After the thermal paper is sandwiched between the pair of conveying rollers 82, the storage section 10 and the upper housing 14 of the print recording section 40 are moved.
By closing 92, each upper transport roller 24, 26.72, which is integral with the upper housing 14.92,
and the conveyance rollers 24, 26.72 located below,
Hold the thermal paper. Further, in the storage section 10, the dancer roller 32 is in contact with the upper surface of the thermal paper and applies a predetermined tension to the thermal paper.

In the vicinity of the storage section 10 of the print recording section 40, there is a storage section 10.
Thermal paper D cut into a different shape than the inner thermal paper
An insertion opening 104 is provided for inserting the holder 10a along the inclined surface of the upper housing 14 of the accommodating portion 10. When inserting the thermal paper Da from the insertion opening 104, the thermal paper loaded in the print recording section 40 in advance is reversely conveyed backward by the reverse drive of the winding core 12 prior to the insertion of the thermal paper Da. It is retreated backward from the conveyance roller 72 near the insertion opening 104. Next, when another thermal paper Da is inserted from the insertion slot 104, the conveyance roller 72.8 in the print recording section 40
2 is driven, and the thermal paper Da is transported to the transport roller 82.
After being bitten by the printer, printing is performed by the thermal heads 42 and 44. When printing on the thermal paper in the container 111'1S10 again, the conveyance rollers 24 and 26 in the container 10
is driven, the thermal paper is conveyed to the print recording section 40, and after being bitten by the conveyance roller 82, the thermal head 42.44
Printing is performed by.

Next, the printing section will be explained. FIG. 2 is a perspective view of the printing section.

The thermal heads 42 and 44 are arranged in two rows, and one line of printing is performed by the two rows of thermal heads 42 and 44. Two thermal heads 42 in the rear row
are arranged in the same row, and a conveyance roller 106 is arranged between the thermal heads 42. One thermal head 44 is arranged in the front row, and conveyance rollers 108 are arranged on both sides of the thermal head 44. Each thermal head 42, 44 has a length one-third the width of the thermal paper and prints at a density of 400 dots/inch. That is, in the three equal regions in the width direction of the thermal paper, the regions at both ends are printed by the rear thermal head 42, and the central region is printed by the front thermal head 44. Therefore, when printing one line of thermal paper, first the rear thermal head 42 prints on both ends, and after a predetermined period of time, the thermal paper below the rear thermal head 42 prints on the front thermal head 42. When it reaches below 44,
The front thermal head 44 performs printing in the center.

The thermal paper during printing by the thermal head 42 and 44 is
The paper is transported by a transport roller 82 near the discharge section shown in FIG. Here, the conveyance rollers 106 and 108 in the same row as the thermal heads 42 and 44 are connected to the motor 56 via the one-way clutch 52, so that when the conveyance roller 82 near the discharge section is overloaded during conveyance, roller 10
6.108 idles. On the other hand, during automatic paper feeding, the transport rollers 106 and 108 are rotationally driven to transport the thermal paper forward.

In addition, as shown in FIG. 1, the thermal head 42, 44
Eccentric cams 68 and 70 are in contact with the support members 60 and 62, and when not printing, such as during automatic paper feeding or reverse conveyance,
The eccentric cam 68. By rotating the TO by a predetermined angle,
The thermal head 4.2° 44 is separated from the thermal paper.

FIG. 3 is a schematic diagram of the thermal paper transport mechanism in the print recording section 40.

The thermal paper is ejected from the storage section 10 by the roller 82 and is printed and recorded by the thermal head 4244 while being conveyed. Behind the rollers 82, brake rollers 138 are provided to apply tension in the direction opposite to the conveying direction to the thermal paper conveyed by the rollers 82, so as to sandwich both edges of the thermal paper. Brake roller 1
The position where 38 is provided is not particularly limited as long as it is behind the roller 82. Also, between the brake rollers 138, a free roller 14 that follows the running of the thermal paper is provided as necessary.
0 is set. The brake roller 138 includes a brake 14 for rotationally driving the brake roller 138.
2 are provided respectively.

A meandering detection device 136 is provided between the roller 82 and the brake roller 138 to detect meandering of the thermal paper. The meandering detection device 136 includes an elongated small-diameter roller 160 in contact with the upper surface of the thermal paper, a pair of arms 162 that pivotally support the small-diameter roller 160, and a pair of arms 162 that are connected to a rotation fulcrum shaft of the arms 162. An encoder 164 for detecting the rotation angle and a biasing device 166 for biasing the arm 162 in the clockwise direction in the figure so that the small diameter roller 160 contacts the thermal paper with a predetermined pressure are provided.

The biasing device 166 includes a driven gear 168 fixed to each rotation fulcrum shaft of the pair of arms 162, a drive gear 170 meshing with the driven gear 168, and a drive gear 170.
It consists of a shaft 172 to which the shaft 172 is fixed and a motor 176 connected to the shaft 172 via an overload clutch 174.

The encoder 164 of the meandering detection device 136 and the brake 142 that brakes the brake roller 138 are connected via a control device for controlling the braking force of the brake 142 according to the amount of meandering detected by the meandering detection device 136. electrically connected.

In the meandering detection device 136, a predetermined driving force is transmitted to the driving gear 170 by the motor 176, and the driving force is transmitted to the small diameter roller 16 via the driven gear 168 and the arm 162.
0, and the small diameter roller 160 acts as a force to press the thermal paper. When the thermal paper meanderes, slack occurs on one side in the width direction of the thermal paper, and the small diameter roller 160 that follows the thermal paper tilts and the arm 162 rotates. Then,
One of the encoders 164 detects the rotation angle of the arm 162 and detects meandering of the thermal paper.

When the meandering detection device 136 detects meandering of the thermal paper, the control device controls the braking of the brake 142 to adjust the tension applied to the thermal paper by the brake roller 138, so that the thermal paper is properly conveyed by the roller 82. It is designed to be transported by road. When the tension is different at both ends of the thermal paper in the width direction, the thermal paper is conveyed by the rollers 82 and
The running path is corrected by moving in the width direction so that the tension at both ends becomes equal to the larger tension.

Note that the meandering detection device 136 uses a long small diameter roller 16.
Although the configuration is such that the entire width direction of the thermal paper is pressed by two rollers, it is also effective to use a configuration in which both ends of the thermal paper in the width direction are pressed by two rollers, respectively.

FIG. 4 is a schematic diagram of a thermal paper transport mechanism equipped with a meandering detection device 133 having another configuration.

In order to restrict the proper conveyance path of the thermal paper, meandering detection devices 133 each consisting of a pair of light emitting elements 132 and a light receiving element 134 are provided slightly outside the area where both edges of the thermal paper run. ing.

The meandering detection device 133 and the brake 142 operate the brake 14 according to the amount of meandering detected by the meandering detection device 133.
They are electrically connected via a control device for controlling the braking force of No. 2.

The traveling thermal paper deviates from the proper conveyance path and interposes between the light emitting element 132 and the light receiving element 134, and the light receiving element 13
When the amount of light received by brake 1 changes, the control device changes the amount of light received by brake 1.
By controlling the braking force of the brake roller 138, the tension applied to the thermal paper is adjusted so that the roller 82 conveys the thermal paper to an appropriate conveyance path.

FIG. 5 is a configuration diagram of the control device 150.

The detection signals from the pair of meandering detection devices 136 are each supplied to an amplifier 152, and the output signal of the amplifier 152 is supplied to an AND circuit 144 and an identification circuit 146. Identification circuit 146 identifies which detection device 136 has been activated. The output signal from the identification circuit 146 is supplied to a drive circuit 148, which controls the rotation of the motor 1.42 to load the rotation of the brake roller 138 on the opposite side of the actuated meander detection device 136. .

When a load is applied to one motor 142 and the tension at one end of the thermal paper is increased, the thermal paper moves in the direction in which the increased tension is reduced, that is, in the direction in which the meandering is corrected.

〔Effect of the invention〕

According to the present invention, since the inclination of the roller that follows the slack due to the meandering of the sheet-like object is detected as the rotation angle of the arm that pivots the roller, meandering can be accurately detected and the sheet-like recording In a recording device using materials, accurate print recording can be performed.

Further, according to the present invention, by changing the torque of the brake roller and increasing or decreasing the tension applied to both ends of the recording material in the width direction, meandering of the recording material can be easily corrected, and accurate printing records can be achieved. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the recording apparatus, FIG. 2 is a perspective view of the printing section, FIGS. 3 and 4 are schematic diagrams of the transport mechanism, and FIG. 5 is a diagram of the control device. Symbols in the figure: IO storage section 24.26.72.82 Conveyance roller 40 Print recording section 32 Ten/Jin roller 42.44 Thermal head 46 Platen roller 90 Rotating member 94 Ejection table 98 Fixing device 132 Light emitting element 134 Light receiving element 133. 1
36 Meandering detection device Brake roller Free roller AND circuit Drive circuit Amplifier Arm biasing device Drive gear Overload clutch Brake identification circuit Control device Small diameter roller Encoder Driven gear Shaft motor 15cr' Fig.

Claims (2)

[Claims] (1) A meandering detection device for a device for tensioning and conveying a sheet-like object, which includes at least one roller supported by a pair of rotatable arms and placed on the upper surface of the sheet-like object; A meandering detection device comprising: an angle detector connected to a rotation fulcrum shaft; and a drive means for simultaneously rotating the arm so that the roller contacts the sheet-like body with a predetermined pressure. (2) A method for correcting meandering of a recording material in a recording apparatus which is equipped with a plurality of rows of a plurality of printing means each having a predetermined main scanning length and performs sub-scanning along the recording material conveyance direction, and conveys the recording material by a pair of rollers. The brake rollers disposed at both ends of the recording material in the width direction apply tension to the recording material being conveyed in a direction opposite to the conveyance direction, and the tension by the brake rollers is adjusted according to the meandering amount of the recording material. A meandering correction method characterized by increasing and decreasing.