JP4472214B2 - Roll paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to an image recording apparatus such as a facsimile machine, a copying machine, or a printer that uses roll paper as recording paper, and a curl correcting member that corrects curl (curl) attached to a portion drawn from the roll paper. The present invention relates to a provided roll paper feeding device.
[0002]
[Prior art]
Conventionally, in a roll paper feeding device that draws roll paper wound in a roll shape from one end side and feeds it in a predetermined direction, the roll paper portion drawn to a predetermined length is cut, and the cut paper is fed in the paper feeding direction Although it is configured to feed downstream, the cut paper is usually curled due to the curl when it is rolled up, so if you feed it as it is, This can cause troubles in paper feeding such as jams.
[0003]
Therefore, a decurling member that contacts the upper surface of the pulled-out portion and applies a pressing force to the upper surface so that the portion pulled out from the roll paper bends in the direction opposite to the curling direction is installed. There is a roll paper feeding device having a curl correction mechanism for correcting curl.
[0004]
However, in the roll paper feeding device having such a configuration, when the roll paper is exchanged, the user pulls out a portion of the new roll paper installed at a predetermined position to the lower side (pressing side) of the decal member. Therefore, it is necessary to set the pulled-out portion so that the decurling member is pressed to be in a curl correcting operation state. However, in some cases, a general user places the pulled-out portion of the roll paper on the decurling member. In the wrong setting state, the paper feeding operation may be started as it is, causing troubles in paper feeding.
[0005]
For this reason, the present inventor has filed as Japanese Patent Application No. 2000-281197 an invention in which the part pulled out from the roll paper when replacing the roll paper can be accurately and easily set in a predetermined state. did. In the present invention, when the roll paper is replaced, the decurling member can be raised from the curl correction position to the standby position and maintained at that position.
[0006]
[Problems to be solved by the invention]
However, in the roll paper feeding device of Japanese Patent Application No. 2000-281197, the configuration is simple, but the amount of movement of the decurling member from the curl correction position to the standby position is small. There is a problem that it is not enough to avoid an erroneous set on the top of the screen.
[0007]
Therefore, the object of the present invention is to solve the above-mentioned conventional problems, to ensure that the curl correction of the roll paper is performed well, and the set of the part where the roll paper is pulled out when the roll paper is replaced is surely performed. To provide a roll paper feeding device.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the roll paper wound in a roll shape is pulled out from one end side and fed in a predetermined direction, and the upper surface of the drawn roll paper is pressed down. a curl correcting member for correcting the curl which stuck to the roll paper and a cover member provided to be openable and pivoted to the apparatus main body top, the receiving rotating force for rotating the cover member of this curl straightening A drive member that moves the member from the curl correction position to the upper retracted position, and as the drive member , a drive gear is provided on the rotation shaft of the cover member, and the drive gear is provided on the rotation shaft of the curl correction member. In the roll paper feeding device provided with the driven gear for receiving the rotational driving force from the rotary gear, an annular operating portion having a cutout portion is formed on a side portion of the driven gear, and the curl correction member is disposed below the cutout portion. And above Supported by the rotation shaft of the driven gear so as to be able to rotate between them, and the upper or lower portion of the notch is in contact with a part of the curl correcting member by receiving the rotational force of the cover member. The curl correction member is configured to move between the curl correction position and the retracted position . With this configuration, when the roll paper is replaced, the curl correction member has a rotation angle of the cover member. Since it rotates to the same extent and is moved to a sufficiently high standby position, when the part pulled out from the roll paper is set below the curl correction member, the curl correction member does not get in the way and is easy and accurate. This can be done, and it can be prevented that the part pulled out from the roll paper is erroneously set on the upper side of the curl correction member. Moreover, it becomes possible to easily set the rotation condition of the curl correction member according to the installation state of the notch portion in the annular operation portion.
[0011]
According to a second aspect of the present invention, in the roll paper feeding device according to the first aspect , any one of a driving gear or a driven gear, or an intermediate gear provided between the driving gear and the driven gear to transmit a rotational driving force. A cramp torque limiter is provided. With this configuration, the turning torque is restricted, so that the cover member can be prevented from turning suddenly.
[0013]
According to a third aspect of the present invention, in the curl paper feeding device according to the first or second aspect , the driving gear and the driven gear are connected by a timing belt to transmit the rotational driving force. With this configuration, it is possible to obtain a simplified and relatively low-cost structure without using an intermediate gear.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 is a perspective view showing a configuration of a main part of a roll paper feeding device for explaining an embodiment of the present invention, wherein 1 is a box-like shape in which a part for installing roll paper 2 is provided on one side part. The decal roller 3 is provided so as to straddle the paper feed path in the frame 1 in the horizontal direction, and 4 is provided at both ends of the decal roller 3 projecting outward from the recesses 1 a formed on both side walls of the frame 1. A pair of curl correction levers 5, each supported by one end portion 4 a and having the other end portion 4 b rotatably provided on the frame 1 as will be described later, are the roll paper 2. In this example, the pick-up roller 6 installed in the frame 1 so as to extend in parallel with the longitudinal direction of the paper covers the upper part of the frame 1 excluding the installation portion of the roll paper 2 and is downstream of the paper feeding direction a. Both ends on the side are pivoted to the frame 1 5 is a cover that is pivotally supported by 5, and is in pressure contact with the pickup roller 5 installed in the frame 1 on the upstream side of the paper feed direction a in the cover 6 (the set position side of the roll paper 2). A roller 7 is rotatably supported, and further, a conveyance roller 8 that conveys the recording paper is rotatably supported so as to be in contact with the conveyance roller 9 installed in the frame 1 on the downstream side in the paper feeding direction a. Has been.
[0016]
In the left side of the frame 1 in FIG. 1, as shown in an enlarged view in FIG. 2, the other end 4b opposite to the one end 4a provided with the decurling roller 3 in one curl correction lever 4 is provided. The rotating shaft 11 of the gear with operating portion 10 is rotatably supported. As shown in the perspective view of FIG. 3, the gear 10 with the operating portion is formed with a gear portion 10 a on one side and an annular operating portion 12 having a notch 12 a on the other side, and the curl correction lever 4 is annular. The actuator 12 is driven to rotate by contacting the notch 12a portion of the operating portion 12.
[0017]
As shown in FIG. 4, the gear portion 10 a in the gear 10 with the operating portion is a driven gear that rotates in conjunction with the drive gear 14 via a gear train 13 including a plurality of intermediate gears. The number of gears installed in the gear train 13 is set as appropriate according to the specifications, but the drive gear 14 and the gear 10 with the operating portion are configured to rotate in the same direction. The drive gear 14 is fixed to a rotation shaft 15 that is a rotation fulcrum of the cover 6, and is rotated with the rotation of the cover 6. The drive gear 14, the gear train 13, and the gear with an operation unit are provided. 10 constitutes a driving member for rotationally driving the curl correcting lever 4.
[0018]
FIG. 5 is an explanatory diagram of the sheet feeding operation in the present embodiment. During feeding, a portion 2a pulled out from the roll paper 2 passes under the decurling roller 3 and pressurizes with the pickup roller 5 as indicated by a solid line. The paper is fed in the paper feeding direction a by the rotation of the pickup roller 5 and the pressure roller 7 while being held at the nip of the roller 7. During feeding, the drawn portion 2a is pressed by the decurling roller 3 while being tensioned by the roll paper 2 and the nip between the pickup roller 5 and the pressure roller 7, so A pressing force is applied in the opposite direction to the curl due to, and a correction action is applied so that the curl is removed.
[0019]
When the roll paper 2 is replaced or set, the cover 6 is driven by rotating the cover 6 clockwise about the rotation shaft 15 from the state where the decurling roller 3 of the curl correcting lever 4 is in the lower position shown in FIG. The gear 14 also rotates in the same clockwise direction, and the rotational driving force of the cover 6 is transmitted to the gear portion 10a of the gear 10 with the operating portion via the gear train 13, and the gear 10 with the operating portion rotates in the clockwise direction. . By the rotation of the gear 10 with the operating portion, the curl correcting lever 4 contacts the lower portion of the notch portion 12a in the annular operating portion 12 and is driven to rotate in the clockwise direction, and the curl is fully opened in the cover 6 shown in FIG. The correction lever 4 rotates to a substantially vertical standby position. The curl correcting lever 4 is maintained at the standby position when the stopper 17 contacts the side wall of the frame 1.
[0020]
In a state where the curl correction lever 4 is in the standby position, the decurling roller 3 is also moved upward, and the portion 2a pulled out from the roll paper 2 is placed under the decurling roller 3 as shown by a two-dot chain line in FIG. Then, the leading end of the portion 2a pulled out is set at a position sandwiched by the nip between the pickup roller 5 and the pressure roller 7. In this way, the roll paper 2 is set with the curl correction lever 4 standing and the decurling roller 3 clearly present at the upper standby position. It is possible to prevent erroneous setting such that the 2a is positioned on the decal roller 3.
[0021]
After the setting of the roll paper 2 is completed, as shown in FIG. 7, when the cover 6 is turned counterclockwise so as to be closed, the drive gear 14 is also turned counterclockwise, via the gear train 13. Then, the rotational driving force of the cover 6 is transmitted to the gear portion 10a of the gear 10 with the operating portion, and the gear 10 with the operating portion rotates counterclockwise. By the rotation of the gear 10 with the operating portion, the curl correcting lever 4 is pushed by the upper part of the cutout portion 12a (positioned on the right side in FIG. 7) of the annular operating portion 12 and rotated counterclockwise by its own weight. Then, it comes into contact with the lower part of the notch 12a and stops, and stops at a predetermined stop position as the gear 10 with the operating part rotates.
[0022]
The notch size of the notch 12a in the annular actuating part 12 of the gear with actuating part 10 corresponds to the angle at which the curl correcting lever 4 is rotated, and accordingly is set according to the standby position of the curl correcting lever 4 and the like. To do.
[0023]
Further, if a torque limiter is provided in any of the drive gear 14, the gear 10 with the operating unit, or the gear train 13 to restrict the rotational torque, the problem caused by the sudden rotation of the cover 6, particularly the cover. Risk of closing can be eliminated.
[0024]
FIG. 8 is a perspective view showing a main part of another example of a drive member that rotationally drives the curl correction lever in the present embodiment. The drive member shown in FIG. 8 will be described with reference to FIG. 14 and the gear portion 10a of the gear with operating portion 10 are configured to transmit the rotational driving force using the timing belt 21, and the cost is reduced by eliminating the gear train 13 for transmitting the rotational driving force. Is intended.
[0025]
In the example of FIG. 8, instead of the drive gear 14 and the gear portion 10a of the gear 10 with the operating portion, a driving pulley is provided on the rotating shaft 15, and an annular operating portion as shown in FIG. It is also conceivable to provide a driven pulley with 12 and connect the two pulleys with a belt to transmit the rotational driving force of the cover 6 to rotate the annular operating portion 12.
[0026]
【The invention's effect】
As described above, according to the present invention, when the roll paper is replaced, the curl correction member can be sufficiently moved to the upper standby position in accordance with the opening / closing operation of the cover member. A roll paper feeding device that can accurately and easily set the roll paper drawer portion without causing the curl correcting member to become an obstacle is realized. Moreover, it becomes possible to easily set the rotation condition of the curl correction member according to the installation state of the notch portion in the annular operation portion.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a main part of a roll paper feeding device for explaining an embodiment of the present invention. FIG. 2 is an enlarged view showing an installation portion of a curl correcting lever in the embodiment of the present invention. FIG. 3 is a perspective view showing a gear with a working part in an embodiment of the present invention. FIG. 4 is a side view for explaining the operation of the main part in the embodiment of the present invention. FIG. 6 is an explanatory view of the roll paper setting and paper feeding operation in FIG. 6. FIG. 6 is an explanatory view of the operation when the cover is fully opened in the embodiment of the present invention. ] Perspective view showing another example of drive member for curl correction lever in this embodiment.
DESCRIPTION OF SYMBOLS 1 Frame 2 Roll paper 2a Part pulled out from roll paper 3 Decal roller 4 Curl correction lever 6 Cover 10 Gear with operation part 10a Gear part 11, 15 Rotating shaft 12 Annular operation part 12a Notch part 13 Gear train 14 Drive gear 21 Timing belt

Claims (3)

A paper feed member that pulls out the roll paper wound in a roll shape from one end side and feeds it in a predetermined direction; a curl correction member that depresses the upper surface of the drawn roll paper and corrects the curl attached to the roll paper; a cover member provided to be openable and pivoted to the apparatus main body top, a drive member for moving said curl correction member receives the rotational force for rotating the cover member of this from the curl correction position upward retracted position The drive member is provided with a drive gear on the rotation shaft of the cover member, and the driven gear receiving the rotation drive force from the drive gear on the rotation shaft of the curl correction member. In the paper feeder ,
An annular working part having a notch part is formed on a side part of the driven gear, the curl correction member is supported on a rotating shaft of the driven gear so as to be rotatable between a lower part and an upper part of the notch part, and the cover A configuration in which the curl correcting member is moved between the curl correcting position and the retracted position by rotating the upper or lower part of the notch portion in contact with a part of the curl correcting member by receiving the turning force of the member. A roll paper feeding device characterized by that . The torque limiter is provided in any one of the drive gear, the driven gear, or an intermediate gear that is provided between the drive gear and the driven gear and transmits a rotational driving force . Roll paper feeder. The driving gear and the driven gear and the roll paper feeding apparatus according to claim 1, wherein it has a structure for transmitting the rotational driving force in conjunction with the timing belt.

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