JP2013180845A - Sheet feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeder that can prevent a hand from being caught therein due to the erroneous operation of a driving source of a conveying device conveying a roll sheet toward an image forming unit side when drawing the sheet feeder from an image forming apparatus and cutting the tip of the roll sheet.SOLUTION: A roll sheet storage unit includes: a frame 100 to support a roll sheet; a feeding means 200 to feed the roll sheet; a pair of roll sheet cutting means to cut the fed roll sheet by a predetermined length; a driving means 400 functioning as a roll sheet feeding/rewinding power source; and a first transmission means 500, a second transmission means and a third transmission means 700 to transmit driving forces of the driving means 400 to the feeding means 200 and the roll sheet.

Description

  The present invention relates to a paper feeding device that supplies roll paper to an image forming apparatus applied to an electrophotographic apparatus or the like.

  Patent Document 1 discloses a configuration for supplying roll paper to an image forming apparatus used in an electrophotographic apparatus or the like.

  The configuration of Patent Document 1 includes an image forming unit 1 that forms an image on a recording sheet and a sheet feeding device 200. The paper feeding device includes a roll paper accommodation unit (30, 40) in which the roll paper (300, 400) is accommodated in the housing (3, 4). Each housing (3, 4) is pulled out in the roll paper transport direction by the rail mechanism section 10 (the housing 4 is not shown).

  The roll paper stored in the roll paper storage unit is sent to the image forming unit 1 side by a feed roller 31 at a constant speed. Also for the feed roller. The leading portion of the roll paper 300 after the cutting operation is rewound in the direction opposite to the direction in which it is sent to the image forming unit 1 side.

  However, in the configuration of Patent Document 1, since all the cut roll paper is discharged out of the apparatus via the transport path 11, the length for removing the leading edge of the roll paper and tape marks and dirt on the outer periphery of the roll paper. However, the roll paper cut short may be jammed in the transport path.

  For this reason, it is assumed that each sheet feeding device is provided with a cutting device for cutting roll paper, the sheet feeding device is pulled out from the image forming apparatus, and the cutting operation described above is performed by the cutting device.

JP 2000-289904 A

  In such a configuration, a driving source of a cutting device that cuts roll paper, a driving source of a feeding device that feeds the roll paper, and a driving source of a conveyance device that conveys the roll paper to the image forming unit side , It is easy to become.

  For this reason, when the paper feeding device is pulled out from the image forming apparatus and the leading edge of the roll paper is being cut, the drive source of the transport device that transports the roll paper to the image forming unit side is erroneously operated to Including the problem of being caught.

  In order to solve the above problem, according to the present invention, in the invention of claim 1, the roll paper container includes a frame that supports the roll paper, a feeding unit that feeds the roll paper, and a roll paper that has been fed out in a predetermined manner. Cutting means for cutting a pair of roll papers to be cut to length, driving means as a power source for feeding and unwinding the roll paper, and transmission means for transmitting the driving force of the driving means to the feeding means and the roll paper The transmission means comprises a first transmission means arranged on one frame side and a second transmission means arranged on the other frame side, and the driving means is a first transmission means is a drive The second transmission means transmits the driving force of the driving means via the feeding means, and the second transmission means receives the second transmission when the roll paper accommodating portion is pulled out. Transmission of the driving force of the driving means to the means One, wherein the separation mechanism is provided.

  According to the second aspect of the present invention, the driving means transmits the driving force of the driving means to the first transmission means via the power transmission means, and the feeding means has a pair of configurations in which a roller is provided on the roller shaft. The first transmission hand is provided with a first gear attached to one roller shaft, a second gear connected to the connecting means, and a second gear connected to the other roller shaft and meshed with the first gear. The second transmission hand includes a third gear 610 having a one-way clutch provided on one roller shaft and a one-way clutch provided on the other roller shaft. The contact / separation mechanism includes a fifth gear that meshes with the first gear, and a one-way clutch gear that is provided with the fifth gear.

  According to the present invention, when the paper feeding device is pulled out from the image forming apparatus and the leading edge of the roll paper is cut, the drive source of the transport device that transports the roll paper to the image forming unit side is erroneously configured. By actuating, it is possible to prevent the hand from being caught.

1 is a schematic diagram of an image forming apparatus applied to a paper feeding device of the present invention. FIG. 3 is a top view of the paper feeding device according to the present invention. The figure seen from the arrow x direction of FIG. The figure seen from the arrow y direction of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an image forming apparatus of the present invention. This apparatus includes an image forming unit A, a fixing unit B, and a conveying unit C.

  The image forming unit A forms an image on a transfer material supplied from a sheet feeding device described later, and conveys the image forming unit A10 and the transfer material to each image forming unit (A10Y, A10M, A10C, A10BK). And a transfer material transport unit A20 transported to the transport means C.

  The image forming unit A forms a toner image to be transferred onto a transfer material. In the image forming unit A10, yellow Y, magenta M, cyan C, and black BK are arranged in parallel in the order of the transfer material conveyance direction.

  In brief, the image forming means A is a charge eliminating means (FIG. 5) for removing residual charges on the image carrier (A11Y, A11M, A11C, A11BK) around the image carrier (A11Y, A11M, A11C, A11BK). Not shown), charging means (not shown) for charging the surface of the image carrier (A11Y, A11M, A11C, A11BK) to a specific polarity, and static charge of the charged image carrier (A11Y, A11M, A11C, A11BK). An exposure unit (not shown) for forming an electrostatic latent image, and the developing device (A12Y, A12Y, A) for developing an electrostatic latent image formed on the surface of the image carrier (A11Y, A11M, A11C, A11BK) with toner. A12M, A12C, A12BK) and the transfer of the toner image developed on the image carrier (A11Y, A11M, A11C, A11BK) from the paper feeding device It consists transfer means for transferring (A13Y, A13M, A13C, A13BK) and the. Supply of toner of each color is performed by toner cartridges (A14Y, A14M, A14C, A14BK).

  In this embodiment, even if color mixing occurs, in order to make it less noticeable, they are arranged in the order of yellow Y, magenta M, cyan C, and black BK in order of the transfer material conveyance direction. However, the present invention is not limited to this, and black BK, cyan C, magenta M, and yellow Y may be used.

  The transfer material transport unit A20 includes a loop belt (endless belt) A21, a drive unit A22, and a driven roller A23, and is arranged in the vertical direction. The belt A21 is stretched in a tensioned state by the drive unit A22 and the driven roller A23. The drive unit A22 includes two rollers (A22a, A22b).

  The fixing unit B fixes the toner image of the transfer material conveyed through the image forming unit A, and includes a pair of rollers (B11a, B11b) and is disposed above the image forming unit A.

  2 to 4 are schematic views of the sheet feeding device of the present invention. As shown in FIG. 1, the paper feeding device has a structure in which roll paper accommodation units 0 that accommodate roll paper P supplied to the image forming unit A are stacked in multiple stages. The roll paper storage unit 0 includes a frame 100, a feeding unit 200, a cutting unit 300, a driving unit 400, and a transmission unit (500, 600), and is drawn out through a handle (arrow direction X in FIG. 1). Be able to.

  The frame 100 supports the roll paper P, is made of a thin plate-like member, and is provided with an attachment portion 110 to which the roll paper P is attached. The roll paper P is attached by attaching holding means (not shown) on both sides of the roll paper P. The holding means is connected to the second transmission means 600 to which the driving force from the driving means 400 described later is transmitted, and the roll paper P is drawn out and rewound.

  As shown in FIG. 2, the feeding unit 200 feeds the roll paper P to the image forming unit A and includes a pair of rotating bodies (210, 210 ′). Specifically, the feeding means 200 is a roller shaft (220, 220 ′) provided with rollers (230, 230 ′). The feeding of the roll paper P by the feeding means 200 is performed by the driving force of the driving means 400 via the transmission means (500, 600).

  The fed roll paper P is cut into a predetermined length by the cutting means 300 as shown in FIGS. The driving unit 400 serves as a power source for feeding and rewinding the roll paper P, and this driving force is transmitted to the transmission unit (500, 600) via a belt serving as the power transmission unit 800.

  The transmission means (500, 600) transmits the driving force of the driving means 400 described above to the feeding means 200 and the roll paper P, and the first transmission means 500 arranged on one frame 100 side. The second transmission means 600 disposed on the other frame 100 side.

  As shown in FIGS. 2 and 3, the first transmission means 500 includes a first gear 510 and a first electromagnetic clutch 520 that meshes with the first gear 510. The first electromagnetic clutch 520 is disposed on the roller shaft 220 ′ and is provided with a switch (not shown) that turns off when the roll paper storage unit 0 is pulled out (detached) from the image forming apparatus. Have

  As shown in FIGS. 2 and 4, the second transmission means 600 includes a third gear 610, a fourth gear 620, a fifth gear 630, a sixth gear 640, a seventh gear 650, and an eighth gear. 660.

  The third gear 610 is disposed on the other roller shaft 220 'and has a built-in one-way clutch. In this one-way clutch, when the roll paper P is fed, the transmission of the driving force of the first transmission means 500 is cut off, the third gear 610 rotates idly, and when the roll paper P is rewound, the first transmission means 500 is driven. It is configured to transmit force.

  The fourth gear 620 meshes with the third gear 610 and is disposed on the fixed shaft 620 ′ and incorporates a one-way clutch that rotates the fourth gear 620 only when the roll paper P is rewound. The seventh gear has a built-in torque limiter, and an eighth gear is provided through the torque limiter. The seventh gear 650 and the eighth gear 660 are connecting portions of a roll paper spool (not shown).

  Further, the first transmission unit 500 prevents the driving force from being transmitted from the first transmission unit 500 to the second transmission unit 600 when the roll paper P is rewound when the roll paper storage unit 0 is pulled out. Three transmission means 700 are provided.

  The third transmission means 700 includes a second electromagnetic clutch gear 710 that meshes with the first gear 510, an eighth gear 720, a first clutch gear 730, and a second gear 740 that meshes with the first clutch gear 730. Consists of. The second gear 740 has a built-in one-way clutch. When the roll paper P is fed, the second gear 740 is transmitted to the other roller shaft 220 ′, and when the roll paper P is rewound, the second gear 740 is transmitted to the other roller shaft 220 ′. It is configured to cut off.

  Based on the above configuration, the operation of the paper feeding apparatus of the present invention will be described. First, when the roll paper P is supplied to the image forming unit, a paper feeding device is attached to the image forming apparatus. At this time, the opening / closing detection switch (not shown) detects that the roll paper storage unit 0 is mounted, and the first clutch 520 is activated.

    Thereafter, when the driving unit 400 is operated, the driving force is transmitted through the transmission path of the first gear 510 and the first electromagnetic clutch 520 via the power transmission unit 800 as shown in FIGS. Is transmitted to the roller shaft 220 '. By turning on / off the operation of the first clutch 520, it is possible to control the contact / separation of transmitting the driving force of the driving means 400 to the other roller shaft 220 ', and the roll paper P can be drawn out and rewound. .

  By such transmission, the roll paper P is fed by the feeding means 200 and the roll paper P stored in the roll paper storage unit 0 is pulled out. The roll paper P is rewound by driving the driving means 400 in the reverse direction and rotating the gears in the reverse direction.

  Next, when the roll paper storage unit 0 is pulled out, an open / close detection switch (not shown) detects that the roll paper storage unit 0 is not mounted and turns off the operation of the first clutch 520.

  Only the third transmission means 700 can be used. That is, the roller shaft 210 ′ rotates only in the pulling direction of the roll paper P by the one-way clutch of the second gear 740. When the roll paper storage unit 0 is being pulled out, only the roll paper P can be pulled out.

  At this time, since the second transmission means 600 does not rotate when the roll paper P is pulled out by the one-way clutch incorporated in the third gear 610 and the fourth gear 620, the seventh gear 650 and the eighth gear 660 are also Does not rotate. As a result, the driving force of the driving unit 400 is prevented from being caught in the second transmission unit 600.

0 roll paper storage unit 100 frame 110 attachment unit 200 feeding unit 300 cutting unit 400 driving unit 500 first transmission unit 510 first gear 520 first electromagnetic clutch 600 second transmission unit 610 third gear 620 fourth gear 630 fifth gear 640 sixth gear 650 seventh gear 660 eighth gear 700 third transmission means 710 second electromagnetic clutch gear 720 ninth gear 730 first clutch gear 740 second gear 800 power transmission means

Claims (2)

In a paper feeder that contains roll paper to be supplied to the image forming unit and includes roll paper storage units that can be placed in multiple stages,
The roll paper storage unit includes a frame that supports the roll paper, a feeding unit that feeds the roll paper, and a cutting unit that cuts the pair of roll papers that cut the rolled paper into a predetermined length. A drive unit serving as a power source for feeding and rewinding the roll paper, and a transmission unit for transmitting the driving force of the drive unit to the feed unit and the roll paper,
The transmission means comprises a first transmission means disposed on one of the frame sides and a second transmission means disposed on the other frame side,
The driving means is configured such that the first transmission means is connected to the driving means and operates the feeding means.
The second transmission means transmits the driving force of the driving means through the feeding means,
The first transmission means is provided with a third transmission means for cutting off the transmission of the driving force of the drive means to the second transmission means when the roll paper accommodating portion is pulled out. Paper device. The driving means transmits the driving force of the driving means to the first transmission means via power transmission means,
The feeding means has a pair of configurations in which a roller is provided on a roller shaft,
The first transmission hand comprises a first gear and a first electromagnetic clutch meshing with the first gear,
The second transmission hand is composed of a third gear disposed on the other roller shaft and a fourth gear meshing with the third gear,
The third transmission means comprises a second electromagnetic clutch gear that meshes with the first gear, a ninth gear, a first clutch gear, and a second gear that is the name of the first clutch gear. The sheet feeding device according to claim 1, wherein:
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