JP2006218741A - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high speed and stable conveying action, even if a component or a mechanism causing resonance is contained from a motor to a detecting means. <P>SOLUTION: The recording device is provided with a conveying means for conveying with paper feeding rollers and pinch rollers, a driving means for driving the paper feeding rollers, a detecting means for detecting the rotary angle of the paper feeding rollers, a controlling means for controlling the driving means, an identifying means for identifying the characteristics from the driving means to the position detecting means, and a deformation component compensator for compensating the deformation components of the paper feeding rollers. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording apparatus equipped with a sheet conveying apparatus that conveys a sheet equipped in an image forming apparatus such as a copying machine, a laser beam printer, and a facsimile to a recording position.

  2. Description of the Related Art Conventionally, recording devices equipped in printers, copiers, facsimiles, etc., or recording devices used as output devices for multifunction devices and workstations including computers, word processors, etc., use paper or plastic thin plates (for example, An image (including characters and symbols) is recorded on a recording material such as an OHP sheet. This recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type, a thermal transfer type, a laser beam type, etc., depending on the recording method of the recording means used.

  Among the above recording apparatuses, in the serial scan type recording apparatus in which the recording head performs main scanning in the direction crossing the conveyance direction (sub-scanning direction) of the recording material, after setting the recording material at a predetermined recording position, An image (including characters and symbols) is recorded by a recording means (recording head) mounted on a carriage that moves (main scans) along the recording material, and a predetermined amount of paper is recorded after recording for one line is completed. By repeating the operation of feeding (sub-scanning) and then recording the next row of images (main scanning), the image is recorded in the desired range of the recording material.

  FIG. 3 shows a schematic perspective view around the recording material conveying means in the conventional recording apparatus (see, for example, Document 1). As conveying means, a paper feed roller 2 and a pinch roller 3 that is always pressed against the recording material 1 or the paper feed roller 2 are arranged. The paper feed roller 2 is driven by a motor 4 that is a driving means.

  The motor 4 appropriately controls the difference between the conveyance amount of the recording material 1 calculated from the signal of the rotary encoder 5 which is a rotation angle detection unit connected to the paper feed roller 2 and a desired predetermined amount by the control unit. And is driven based on the signal amplified by the amplifier 9. The control means is determined in consideration of resonance frequency characteristics up to the rotation angle detection means.

  The recording head 12 records an image on the platen 13 on the recording material 1 conveyed by the paper feed roller 2 and the pinch roller 3.

The serial scan type recording apparatus is relatively inexpensive and easy to increase in size, so it can be used in large printers that can print on large paper with a width of 420 mm or more for large CAD drawings and poster creation. ing.
JP-A-6-327276 (page 4 FIG. 2)

  In the conventional configuration, since the control means has only the function of removing the resonance frequency, the control system can be prevented from becoming unstable, but cannot be driven at high speed.

  Further, in a printing apparatus such as a large printer, since the material, thickness and width of the recording material suitable for the application are selected and used, the load on the paper feed roller varies greatly depending on the use conditions. Therefore, the resonance frequency characteristic from the motor drive signal to the detection means is not uniquely determined. In addition, the characteristics change due to wear and deterioration over time such as the rollers and bearings that make up the transport means, so when using control means that are designed and determined in advance, the control system becomes unstable or the convergence slows down. The problem could not be solved.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and a recording unit for recording on a recording material, and the recording material is sandwiched between a paper feed roller and a pinch roller and conveyed to the recording unit. Identification for estimating characteristics from the transport means, the drive means for driving the paper feed roller, the detection means for detecting the rotation angle of the paper feed roller, the control means for controlling the drive means, and the drive means to the position detection means And a deformation component compensator that compensates for a deformation component of the paper feed roller, wherein the identification unit sequentially adjusts the deformation component compensator.

  The control means and the deformation component compensator are divided, and further, the deformation component compensator is sequentially adjusted by the identification means even when the material of the recording material, the thickness, the width, the parts are consumed or deteriorate with time, and the characteristic fluctuation is large. As a result, high-speed and stable conveyance becomes possible.

  As described above, according to the present invention, the control means and the deformation component compensator are divided, and the deformation component compensator for compensating the resonance frequency component of the paper feed roller is sequentially changed by the identification means, so that the type of recording material High-speed and stable conveyance is possible without being affected by width, wear of parts, and changes with time.

  A schematic perspective view of a recording apparatus according to the present invention is shown in FIG. A schematic operation will be described with reference to FIG.

  A recording head 10 for recording on the recording material 1, a conveying means comprising a paper feeding roller 2 and a pinch roller 3 for conveying the recording material 1 to the platen 11, a driving means 4 for driving the paper feeding roller 2, etc. Consists of

  The recording material 1 is conveyed by a predetermined amount to the platen 11 while being sandwiched between the paper feed roller 2 and the pinch roller 3. Thereafter, the recording head 10 slidably supported by a guide shaft (not shown) performs recording while moving in a direction perpendicular to the recording material 1 conveyance direction. By repeating the above operation, an image is recorded in a desired range of the recording material.

  The control means 10 converts the object to be converted, which is converted through a deformation component compensator 9 that compensates a twist component from a predetermined amount of paper feed determined in advance and the rotation angle of the paper feed roller 2 observed by the rotary encoder 8 or the like. Comparing the conveyance amount of the recording material 1 and performing a compensation calculation. Thereafter, it is appropriately amplified by an amplifier and the driving means 4 is driven.

  The control means 10 may use a generally used PI compensator.

  Next, the deformation component compensator 9 will be described. The characteristic from the drive means 4 to the position detection means is a characteristic having a resonance frequency represented by the following equation. Further, other than the expression 1 may be used as an expression of the resonance characteristics.

そこで、変形成分補償器９は共振周波数成分をキャンセルする構成になり、式２で表すことができる共振周波数成分のみを除去するノッチフィルタを使っても良い。

Therefore, the deformation component compensator 9 is configured to cancel the resonance frequency component, and a notch filter that removes only the resonance frequency component that can be expressed by Expression 2 may be used.

また変形成分補償器９として、前記駆動手段４から位置検出手段までの特性の逆特性を実現してもよい。

Further, as the deformation component compensator 9, a reverse characteristic from the driving means 4 to the position detecting means may be realized.

  The identification unit 7 sequentially estimates the characteristics from the drive unit 4 to the position detection unit from the drive signal and the output signal of the position detection unit. Any adaptive algorithm may be used for the estimation. The deformation component compensator 9 is adjusted using the result.

  FIG. 2 shows the effect of the present invention. When the load variation is larger than expected, the waveform becomes oscillating in the conventional example, but according to the present invention, the load converges quickly even when the load variation is large.

1 is a schematic perspective view of a recording apparatus according to the present invention. The graph which shows the effect of this invention. FIG. 6 is a schematic perspective view of a conventional recording apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording material 2 Paper feed roller 3 Pinch roller 4 Drive means,
5 Rotary encoder 6 Deformation compensation means 7 Identification means 8 Control means
9 Amplifier 10 Recording head 11 Platen

Claims (1)

  A recording unit that records on a recording material, a conveying unit that sandwiches the recording material between a paper feeding roller and a pinch roller and conveys the recording material to the recording unit, a driving unit that drives the paper feeding roller, and a driving unit are connected. Detecting means connected to the opposite end of the paper feed roller for detecting the rotation angle of the paper feed roller; control means for controlling the drive means; identification means for estimating characteristics from the drive means to the position detection means; And a deformation component compensator that compensates for the deformation component of the paper feed roller, wherein the identification unit sequentially adjusts the deformation component compensator.

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