JP2005193526A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress or prevent a sound (a sound of a rubber) due to vibration of a paper feed roller 51 when the paper feed roller 51 is rotated to convey a recording paper 2 in a sub-scanning direction in a condition that an external circumference of a roll 3 of recording paper is pressed against the paper feed roller 51 in a printer using the roll 3 of recording paper. <P>SOLUTION: The paper feed roller 51 is rotatably held by a paper feed roller holder 55 different from a frame 40 and a weight 56 for preventing resonance is provided to the paper feed roller holder 55 to finely be vibrated. When the vibration of the paper feed roller 51 is transmitted to the weight 56 through the paper feed roller holder 55, the weight 56 is vibrated in a phase different from that of the paper feed roller 51. As the vibrations having different phases are synthesized, the amplitude of the vibration of the paper feed roller 51 can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a printer that uses a recording paper roll in which a long recording paper is wound around a core, and in particular, can directly print an image without using a personal computer by connecting a digital camera or inserting a memory card. The present invention relates to noise reduction of a paper feed roller when a recording paper roll is loaded in a paper feed unit in a printer.

  In recent years, with the spread of digital cameras, printers capable of printing images by directly connecting a digital camera or inserting a memory card without using a personal computer have been put into practical use. In order to distinguish from a printer connected to a conventional personal computer, such a printer is referred to as a “digital camera compatible printer”.

  In a printer compatible with a digital camera, a thick and glossy dedicated recording paper is used in order to obtain a print similar to a silver salt photograph using a conventional film and photographic paper. Also, since the size of the image to be printed is in accordance with the silver halide photography system, it is necessary to correspond to a particularly long landscape print such as a panorama size in addition to a normal image sensor aspect ratio. For this reason, digital camera compatible printers generally use a recording paper roll in which a long recording paper is wound around a cylindrical core, and one of the vertical and horizontal dimensions of the printed image is set to the width of the recording paper. By fixing and changing the cutting length of the recording paper in accordance with the other dimension, images of various sizes are supported.

  In a printer using such a recording paper roll, the outer diameter of the recording paper roll gradually decreases as the recording paper is consumed. Is driven to feed the recording paper from the recording paper roll. If the paper feed roller idles, the recording paper feed amount decreases, the resulting print size decreases, and the image is compressed in the recording paper feed direction, degrading image quality. Therefore, in order to prevent the paper feed roller from idling on the outer peripheral surface of the recording paper roll, the paper feed roller is formed of a material such as rubber having a large friction coefficient, and a spring or the like is used when transporting the recording paper. The paper feed roller is pressed against the outer peripheral surface of the recording paper roll with a very strong force.

  In a paper feeding unit of a printer using such a paper feeding roll, the rotation shaft of the paper feeding roller driven by a motor or the like is not displaced with respect to the frame, and is fitted to both ends of the core of the recording paper roll. The shaft unit is configured to be displaced along a guide groove formed in the frame. A biasing lever biased by a spring is brought into contact with the shaft unit so as to press the shaft unit fitted to the core of the recording paper roll against the rotating shaft side of the paper feed roller.

  In order to load the recording paper roll into the paper feeding unit, first, the shaft units fitted to both ends of the core of the recording paper roll are respectively opened from the opened rear end of the guide groove opposite to the paper feeding roller. The guide groove is fitted and moved along the guide groove. At that time, since the shaft unit contacts the urging lever, when further force is applied, the urging lever rotates in the direction opposite to the urging direction, and the shaft unit gets over the urging lever. After that, the urging lever urges the shaft unit toward the front end of the guide groove, so that even if the user releases the hand, the shaft unit moves along the guide groove as it is, and the outer peripheral surface of the recording paper roll feeds the paper. The contact of the roller stops the movement of the shaft unit. Further, in this state, the recording paper roll is rotated to position the leading end of the recording paper at a predetermined position.

  Incidentally, a driving force transmission mechanism or the like is engaged with the paper feed roller, and a driving shaft of a motor is engaged with the driving force transmission mechanism. Torque for driving the drive force transmission mechanism or motor rather than the friction force acting between the recording paper and the paper feed roller when rotating with the outer peripheral surface of the recording paper roll in contact with the paper feed roller Therefore, the sheet feeding roller does not rotate, and the recording sheet moves while sliding on the sheet feeding roller. Since the vicinity of the surface of the paper feed roller is formed of an elastic body such as rubber, it is deformed by the biasing force of the spring and also deformed by the slip of the recording paper. When the elastic deformation of the paper feed roller becomes large, it tries to recover by elastic force. Therefore, the surface of the paper feed roller is repeatedly deformed and restored to cause minute vibrations, which propagate to each part of the paper feed unit and cause resonance, which causes noise called “squealing” such as “cooking”. Such noise of the paper feed roller is directly heard by the user's ears when the printer cover is opened and the recording paper roll is loaded, leading to a reduction in product quality. Moreover, it is easy to become a target of complaints from users.

  Therefore, it is conceivable to provide a mechanism for turning on / off a spring urging force for pressing the recording paper roll against the paper feed roller in conjunction with opening and closing of the cover of the paper feed unit of the printer. Specifically, a first biasing lever that biases the shaft unit fitted to both ends of the core of the recording paper roll with a weak biasing force regardless of whether the cover is opened or closed, toward the paper feed roller, It is rotated in the direction opposite to the urging direction in conjunction with the opening operation of the cover and locked in the retracted position, and the lock is released in conjunction with the closing operation of the cover, and it rotates in the urging direction with a strong urging force. A two-stage structure of a second urging lever that urges the first urging lever toward the sheet feeding roller side is adopted. In this way, when the user loads the recording paper roll, the frictional force acting on the outer peripheral surfaces of the paper feeding roller and the recording paper roll is reduced, and noise due to vibration of the paper feeding roller can be reduced. . However, the configuration of the paper feeding unit becomes complicated, the number of parts increases, and this causes a cost increase. Furthermore, there is a problem that the paper feeding unit is enlarged.

  On the other hand, in Patent Document 1, a holder that holds a friction pad for pressing a recording sheet against the outer peripheral surface of a sheet feeding roller in a sheet feeding mechanism that takes out the recording sheets cut in advance from the sheet feeding tray one by one and conveys them. It is energized by a leaf spring, and the vibration of the friction pad is reduced by the vibration-proofing action of the leaf spring. Such a configuration is effective for a printer in which the recording sheet is cut in advance and the recording sheet conveyance accuracy by the sheet feeding mechanism may be somewhat rough. However, in a printer that uses a recording paper roll as described above and is required to accurately feed the recording paper without the paper feeding roller sliding on the outer peripheral surface of the recording paper roll, the recording paper roll is used as the paper feeding roller. Since the urging force of the spring for pressing against the spring is very strong, even if a leaf spring is added to reduce vibration, there is almost no effect.

Further, in Patent Document 2, in a printer having a platen and a sound insulation cover, a sound absorbing roller that rotates in synchronization with the platen and a paper pressing roller provided on both sides of the sound absorbing roller are provided. The opening is sealed. According to such a configuration, although noise leaking from the inside of the printer to the outside is reduced, there is a problem that the configuration of the printer is complicated and the size of the printer itself is increased.
JP-A-7-133303 JP 60-46282 A

  The present invention has been made to solve the above-described problem. In a printer using a recording paper roll, the paper feeding unit is not complicated and the paper feeding unit is not enlarged. An object of the present invention is to provide a printer in which noise caused by vibration of a paper roller is reduced.

In order to achieve the above object, the invention of claim 1 is a printer capable of forming an image using digital image data by using a recording paper roll and directly connecting a digital camera or inserting a memory card. And
A paper feed unit that rotatably supports a recording paper roll in which a long recording paper is wound around a cylindrical core, and feeds the leading end of the recording paper in the sub-scanning direction, which is the longitudinal direction,
A recording paper transport mechanism for reciprocally transporting the recording paper fed from the recording paper roll in the sub-scanning direction;
A recording head provided on the downstream side of the recording paper roll in the sub-scanning direction and forming an image on the recording paper one line at a time in the main scanning direction which is the width direction of the recording paper;
A cutter that is provided on the downstream side of the recording head in the sub-scanning direction and cuts a portion of the recording paper on which an image is formed according to the size of the image;
An image data reading unit for reading digital image data from the digital camera or the memory card;
An image formation control unit that drives and controls the recording head using the image data read by the image data reading unit;
A recording paper conveyance control unit that drives and controls the recording paper conveyance mechanism using the image data read by the image data reading unit;
A recording paper cutting control unit for driving and controlling the cutter using the image data read by the image data reading unit;
The image formation control unit drives and controls the recording head using the image data when the image data relates to a single color, and when the image data relates to a plurality of colors, the image of each color Extracting data and controlling the drive of the recording head using the image data for one extracted color is repeated until completion for all colors,
When the image data relates to a single color, the recording paper conveyance control unit drives and controls the recording paper conveyance mechanism in accordance with the image data, so that the recording paper is fixed downstream in the sub-scanning direction. When the image data is related to a plurality of colors, the roll drive mechanism and the recording paper transport mechanism are moved according to the extracted image data for one color. By driving and controlling, the recording paper is fed out to the downstream side in the sub-scanning direction at a constant speed by a predetermined length according to the image size. The recording paper is rewound upstream in the sub-scanning direction, and the formation of the next one color image is repeated for all the colors until completion.
The recording paper cutting control unit is a printer that drives and controls the cutter after an image is formed on the recording paper, and cuts a portion of the recording paper on which the image is formed according to the formed image size. ,
The paper feeder is
A pair of shaft units respectively fitted to both ends of the core of the recording paper roll;
A frame having a guide groove that rotatably supports the shaft unit horizontally and holds the shaft unit slidably;
The recording medium is rotatably supported about the horizontal direction as a central axis, transmits driving force through a driving mechanism, has a large coefficient of friction at the portion in contact with the outer peripheral surface of the recording paper roll, and has elasticity. A paper feed roller that conveys the recording paper in the sub-scanning direction by rotating while abutting the outer peripheral surface of the paper roll;
A paper feed roller holder provided separately from the frame and rotatably supporting the paper feed roller;
Provided with a weight for preventing resonance provided to the paper feed roller holder so as to be able to vibrate minutely,
The vibration of the paper feed roller due to friction when the paper feed roller rotates while contacting the outer peripheral surface of the recording paper roll is canceled by the vibration of the weight.

The invention of claim 2 is a printer using a recording paper roll.
A paper feed unit that rotatably supports a recording paper roll in which a long recording paper is wound around a cylindrical core, and feeds the leading end of the recording paper in the sub-scanning direction, which is the longitudinal direction,
A recording paper transport mechanism for reciprocally transporting the recording paper fed from the recording paper roll in the sub-scanning direction;
A recording head provided on the downstream side of the recording paper roll in the sub-scanning direction and forming an image on the recording paper;
A cutter that is provided downstream of the recording head in the sub-scanning direction and cuts a portion of the recording paper on which an image is formed according to the size of the image;
The paper feeding unit is configured to feed the recording paper in the sub-scanning direction by rotating while contacting the outer peripheral surface of the recording paper roll;
A paper feed roller holder that rotatably supports the paper feed roller;
A weight for preventing resonance is provided on the paper feed roller holder.

  According to a third aspect of the invention, in the printer of the second aspect, the weight is not fixed to the paper feed roller holder.

  According to the first aspect of the present invention, in the printer capable of forming an image using digital image data by directly connecting a digital camera or inserting a memory card using a recording paper roll, a weight for preventing resonance. Is provided on the paper feed roller holder so as to be able to vibrate slightly, so even if the paper feed roller vibrates by rotating while contacting the outer peripheral surface of the recording paper roll, the weight has a phase different from that of the paper feed roller. The vibration of the paper feed roller can be canceled by the vibration. For this reason, even when the printer cover is opened and the recording paper roll is loaded, the noise of the paper feed roller becomes very small and the quality of the product does not deteriorate. In addition, the relatively simple configuration in which the weight is provided in the paper feed roller holder reduces the noise caused by vibration of the paper feed roller without complicating the structure of the paper feed unit and without increasing the size of the paper feed unit. Or it can be prevented. As a result, it is possible to reduce or prevent noise (rubber squealing) due to vibration of the paper feed roller.

  According to the invention of claim 2, since the weight for preventing resonance is provided in the paper feed roller holder so as to be able to minutely vibrate in all printers using the paper feed roller, the paper feed roller is provided on the outer peripheral surface of the recording paper roll. Even if it vibrates by rotating while being in contact with the paper, the vibration of the paper feed roller can be canceled by the fact that the weight vibrates at a phase different from that of the paper feed roller. In addition, the relatively simple configuration in which the weight is provided in the paper feed roller holder reduces the noise caused by vibration of the paper feed roller without complicating the structure of the paper feed unit and without increasing the size of the paper feed unit. Or it can be prevented. As a result, it is possible to reduce or prevent noise (rubber squealing) due to vibration of the paper feed roller.

  According to the invention of claim 3, since the weight is not fixed to the paper feed roller holder, the weight itself can vibrate with a phase different from that of the paper feed roller. Therefore, the amplitude of the vibration of the paper feed roller can be attenuated by superimposing vibrations having different phases.

  The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a printer using a recording paper roll according to an embodiment of the present invention. As shown in FIG. 1, the printer 1 has a paper feeding unit 4 for storing a recording paper roll 3 around which a long recording paper 2 is wound around a core, and a leading end of the recording paper 2 from the paper feeding roll 3. A recording paper transport mechanism 5 that transports the recording paper 2 in the sub-scanning direction, which is the longitudinal direction of the recording paper 2, and a recording head that is provided downstream of the recording paper roll 3 in the sub-scanning direction and forms an image on the recording paper 2 6, a cutter 7 for cutting a portion of the recording paper 2 on which an image is formed, and a recording paper piece cut by the cutter 7, that is, a tray 8 for holding a print on which an image is formed. Has been.

  Further, the printer 1 is read by the image data reading unit 11 and the image data reading unit 11 for reading the digital image data from the digital camera 9 when the digital camera 9 is directly connected or the memory card 10 is inserted. The image forming control unit 12 that drives and controls the recording head 6 using the image data, and the recording paper conveyance control that drives and controls the recording paper conveyance mechanism 5 using the image data read by the image data reading unit 11. And a recording paper cutting control unit 14 for driving and controlling the cutter 7 using the image data read by the image data reading unit 11.

  A pair of shaft units 20 are fitted to both ends of the core of the recording paper roll 3, and are rotatably supported with respect to the frame 40. The diameter of the recording paper roll 3 gradually decreases as the recording paper 2 is consumed. Therefore, the shaft unit 20 that pivotally supports the rotation of the recording paper roll 3 is not driven per se, and is configured to be driven to rotate as the recording paper 2 is conveyed by the recording paper conveying mechanism 5. .

  The recording paper transport mechanism 5 is in pressure contact with the outer periphery of the recording paper roll 3 and is driven to rotate in a predetermined direction, thereby pushing the recording paper 2 in the sub-scanning direction and pulling it back. 51, a driving roller 52 that reciprocates the recording paper 2 drawn out from the recording paper roll 3 in the sub-scanning direction at a constant speed in the sub-scanning direction, a feed roller 51, a driving roller 52, and the like. The motor 53 and a driving force transmission mechanism 54 such as a gear train and a timing belt are included. The shaft unit 20 is urged by a torsion spring 41 and a pressing lever 42 in a direction in which the outer peripheral surface of the recording paper roll 3 is pressed against the paper feed roller 51.

  In the present embodiment, a thermal head that simultaneously forms an image for one line in the main scanning direction, which is the width direction of the recording paper 2, is used as the recording head 6, and a thermal type is used as the recording paper 2. Yes. When the image data read by the image data reading unit 11 relates to a single color, the image formation control unit 12 drives and controls the recording head 6 using the image data, and a single color image is recorded on the recording paper 2. Form. In parallel with this, the recording paper conveyance control unit 13 drives and controls the recording paper conveyance mechanism 5 in accordance with the image data, so that the recording paper 2 is adjusted to the image size at a constant speed downstream in the sub-scanning direction. It is fed out according to a predetermined length. After the image is formed on the recording paper 2, the recording paper cutting control unit 14 drives and controls the cutter 7 according to the image size formed on the recording paper 2 to form an image on the recording paper 2. Cut the marked part. The cut recording paper piece, that is, the print is discharged onto the tray 8.

  On the other hand, when the image data read by the image data reading unit 11 is related to color, that is, a plurality of colors, the image formation control unit 12 selects each color (for example, from the image data read by the image data reading unit 11). , Yellow, magenta, and cyan) are extracted, and the recording head 6 is driven and controlled using the extracted image data for one of the colors (for example, yellow). A yellow image is formed on top. In parallel with this, the recording paper conveyance control unit 13 drives and controls the recording paper conveyance mechanism 5 in accordance with the yellow image data, so that the recording paper 2 has its image size at a constant speed downstream in the sub-scanning direction. It is fed out for a predetermined length according to. When a yellow image is formed on the recording paper 2, the recording paper conveyance control unit 13 drives and controls the recording paper conveyance mechanism 5 to rewind the recording paper 2 upstream in the sub-scanning direction by the amount fed. . Then, the image formation control unit 12 and the recording paper conveyance control unit 13 repeat the same process as described above for all remaining colors (magenta and cyan). When the image of the last color (for example, cyan) is formed on the recording paper 2, the recording paper transport control unit 13 does not rewind the recording paper 2 upstream in the sub-scanning direction, and the recording paper transport mechanism 5. Is controlled to convey the recording paper 2 further downstream in the sub-scanning direction. After all the color images are formed on the recording paper 2, the recording paper cutting control unit 14 drives and controls the cutter 7 according to the image size formed on the recording paper 2, thereby recording the recording paper. 2. Cut the portion of 2 where the image is formed.

  Next, a detailed configuration of the paper feeding unit 4 is shown in FIG. The paper feed unit 4 includes the shaft unit 20, a paper feed roller 51 that constitutes the recording paper transport mechanism 5, a frame 40, a torsion spring 41, and a pressing lever 42. The frame 40 has a guide groove 43 that rotatably supports the shaft unit 20 horizontally and holds the shaft unit 20 slidably. One end of the guide groove 43 is opened so that the shaft unit 20 can be attached and detached. The paper feed roller 51 is supported by a paper feed roller holder 55 provided separately from the frame 40 so as to be rotatable about the horizontal direction as a central axis. The paper feed roller holder 55 is fixed in a cantilever shape with respect to the frame 40, and a resonance preventing weight 56 is provided in the vicinity of the free side end portion of the paper feed roller holder 55 so as to be able to minutely vibrate. Yes. The weight 56 is not fixed to the paper feed roller holder 55. For example, the weight 56 is inserted and held in a space (a slot 55c to be described later) formed inside the paper feed roller holder 55 so as to be finely moved. ing.

  As shown in FIG. 3, the paper feed roller 51 is provided around a metal main shaft 51a rotatably supported by the paper feed roller holder 55 and the main shaft 51a, and has a large friction coefficient such as rubber, for example. And a gear 51 or a timing pulley which is formed of an elastic material and which is formed at one end of the main shaft 51a and which is contacted with the outer peripheral portion of the recording paper roll 3 and through which the driving force is transmitted via the driving force transmission mechanism 54. 51c and the like. The paper feed roller holder 55 is formed by, for example, resin molding, a bearing portion 55a that rotatably supports the paper feed roller 51, and a recording that is positioned downstream of the bearing portion 55a in the sub-scanning direction and is conveyed. A conveyance guide portion 55b that guides the paper 2 and a slot 55c that is provided on the opposite side of the conveyance guide portion 55b with respect to the bearing portion 55a and into which the weight 56 is inserted and held. A plurality of protrusions 55d are formed in the opening of the slot 55c. As the weight 56, for example, an iron plate having a predetermined thickness is cut into a predetermined width and length, and is inserted into the slot 55c using the elastic deformation of the protrusion 55d and held.

  In this way, when the paper feed roller 51 is rotated while being brought into contact with the outer peripheral surface of the recording paper roll 3 by the simple configuration in which the weight 56 is provided in the vicinity of the free end of the paper feed roller holder 55 having a cantilever shape. The vibration of the paper feed roller 51 due to this friction can be canceled by the vibration of the weight 56, and noise (rubber squeal) due to the vibration of the paper feed roller 51 can be reduced or prevented.

  Next, the reason why noise due to vibration of the paper feed roller 51 is reduced or prevented by providing the weight 56 in the paper feed roller holder 55 will be considered. One of the possible reasons is that the weight 56 is not fixed to the paper feed roller holder 55. When the paper feed roller 51 vibrates, the vibration is transmitted to the paper feed roller holder 55 and further to the weight 56. However, the weight 56 is not fixed to the paper feed roller holder 55 and can move within a certain range by receiving vibration. For this reason, the vibration phase of the weight 56 gradually shifts from the vibration phase of the paper feed roller holder 55 during vibration. When vibrations having different phases are combined, the vibration amplitude is attenuated, so that it is considered that noise due to vibration of the paper feed roller 51 is reduced. Further, when the phase is shifted by ½ period, the amplitude becomes zero, so that noise due to vibration of the paper feed roller 51 does not occur. Incidentally, when the weight 56 was fixed to the paper feed roller holder 55 with a double-sided tape, noise due to vibration of the paper feed roller 51 was not significantly reduced.

  Further, it is conceivable that the weight 56 is provided at a position close to the rotation axis of the paper feed roller 51. As shown in FIG. 2, the weight 56 is provided at a position close to the rotation axis of the paper feed roller 51, so that the weight 56 is used before the vibration of the paper feed roller 51 is transmitted to each part of the paper feed unit 4. It is thought that it is attenuated by vibrations with different phases. Further, when the length of the weight 56 in the main scanning direction is variously changed, the noise reduction effect due to the vibration of the paper feeding roller 51 is the most when the weight 56 is provided over the entire width of the paper feeding roller holder 55 in the main scanning direction. Was found to be expensive.

  As described above, according to the printer of the present embodiment, the weight 56 for preventing resonance is provided in the paper feed roller holder 55 so as to be able to vibrate slightly, so that the paper feed roller 51 is provided on the outer peripheral surface of the recording paper roll 3. Even if the weight 56 vibrates by rotating while abutting, the weight 56 vibrates at a phase different from the vibration of the paper feed roller 51, thereby canceling the vibration of the paper feed roller 3. For this reason, even when the printer cover is opened and the recording paper roll is loaded, the noise of the paper feed roller 51 becomes very small and the quality of the product does not deteriorate. In addition, the relatively simple configuration in which the weight 56 is provided in the paper feed roller holder 55 does not complicate the structure of the paper feed unit 4 and does not increase the size of the paper feed unit 4. Noise due to vibration can be reduced or prevented.

  The present invention is not limited to the above-described embodiment, and can be applied to all printers using a recording paper roll. Further, it is sufficient that a weight for preventing resonance is provided in a paper feed roller holder provided separately from the frame, and the position, weight, shape, material, etc. of the weight are not particularly limited, and the width of the recording paper, the recording paper An optimum value may be selected by experiment according to the diameter of the roll and the material of the paper feed roller.

1 is a diagram illustrating a schematic configuration of a printer using a recording paper roll according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a detailed configuration of a paper feeding unit of the printer. The figure which shows the shape of a paper feed roller holder and the paper feed roller hold | maintained at it.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer 2 Recording paper 3 Recording paper roll 4 Paper feeding part 5 Recording paper conveyance mechanism 6 Recording head 7 Cutter 9 Digital camera 10 Memory card 11 Image data reading part 12 Image formation control part 13 Recording paper conveyance control part 14 Recording paper cutting | disconnection control 40 frame 41 torsion spring 42 pressure lever 43 guide groove 51 paper feed roller 55 paper feed roller holder 56 weight

Claims (3)

A printer capable of forming an image using digital image data by directly connecting a digital camera using a recording paper roll or inserting a memory card,
A paper feed unit that rotatably supports a recording paper roll in which a long recording paper is wound around a cylindrical core, and feeds the leading end of the recording paper in the sub-scanning direction, which is the longitudinal direction,
A recording paper transport mechanism for reciprocally transporting the recording paper fed from the recording paper roll in the sub-scanning direction;
A recording head provided on the downstream side of the recording paper roll in the sub-scanning direction and forming an image on the recording paper one line at a time in the main scanning direction which is the width direction of the recording paper;
A cutter that is provided on the downstream side of the recording head in the sub-scanning direction and cuts a portion of the recording paper on which an image is formed according to the size of the image;
An image data reading unit for reading digital image data from the digital camera or the memory card;
An image formation control unit that drives and controls the recording head using the image data read by the image data reading unit;
A recording paper conveyance control unit that drives and controls the recording paper conveyance mechanism using the image data read by the image data reading unit;
A recording paper cutting control unit for driving and controlling the cutter using the image data read by the image data reading unit;
The image formation control unit drives and controls the recording head using the image data when the image data relates to a single color, and when the image data relates to a plurality of colors, the image of each color Extracting data and controlling the drive of the recording head using the image data for one extracted color is repeated until completion for all colors,
When the image data relates to a single color, the recording paper conveyance control unit drives and controls the recording paper conveyance mechanism in accordance with the image data, so that the recording paper is fixed downstream in the sub-scanning direction. When the image data is related to a plurality of colors, the roll drive mechanism and the recording paper transport mechanism are moved according to the extracted image data for one color. By driving and controlling, the recording paper is fed out to the downstream side in the sub-scanning direction at a constant speed by a predetermined length according to the image size. The recording paper is rewound upstream in the sub-scanning direction, and the formation of the next one color image is repeated for all the colors until completion.
The recording paper cutting control unit is a printer that drives and controls the cutter after an image is formed on the recording paper, and cuts a portion of the recording paper on which the image is formed according to the formed image size. ,
The paper feeder is
A pair of shaft units respectively fitted to both ends of the core of the recording paper roll;
A frame having a guide groove that rotatably supports the shaft unit horizontally and holds the shaft unit slidably;
The recording medium is rotatably supported about the horizontal direction as a central axis, transmits driving force through a driving mechanism, has a large coefficient of friction at the portion in contact with the outer peripheral surface of the recording paper roll, and has elasticity. A paper feed roller that conveys the recording paper in the sub-scanning direction by rotating while abutting the outer peripheral surface of the paper roll;
A paper feed roller holder provided separately from the frame and rotatably supporting the paper feed roller;
Provided with a weight for preventing resonance provided to the paper feed roller holder so as to be able to vibrate minutely,
The printer according to claim 1, wherein the vibration of the paper feed roller due to friction when the paper feed roller is rotated while contacting the outer peripheral surface of the recording paper roll is canceled by the vibration of the weight. In a printer using a recording paper roll,
A paper feed unit that rotatably supports a recording paper roll in which a long recording paper is wound around a cylindrical core, and feeds the leading end of the recording paper in the sub-scanning direction, which is the longitudinal direction,
A recording paper transport mechanism for reciprocally transporting the recording paper fed from the recording paper roll in the sub-scanning direction;
A recording head provided on the downstream side of the recording paper roll in the sub-scanning direction and forming an image on the recording paper;
A cutter that is provided downstream of the recording head in the sub-scanning direction and cuts a portion of the recording paper on which an image is formed according to the size of the image;
The paper feeding unit is configured to feed the recording paper in the sub-scanning direction by rotating while contacting the outer peripheral surface of the recording paper roll;
A paper feed roller holder that rotatably supports the paper feed roller;
A printer comprising a resonance preventing weight provided in the paper feed roller holder.   The printer according to claim 2, wherein the weight is not fixed to the paper feed roller holder.

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