JP3727018B2 - Paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding device of an electrophotographic apparatus such as a copying machine or a laser printer that handles cut paper.
[0002]
[Prior art]
In a conventional paper feeding device comprising upper and lower two-stage paper feeding units, the lower roller and the separation roller are exchanged by raising the upper table and covering the opening of the stay that partitions the upper and lower paper feeding units. Replacement work was performed after removing the parts. Further, when there is no opening in the stay, it is necessary to replace the roller in a limited area only on the lower side of the stay.
[0003]
[Problems to be solved by the invention]
In this type of paper feeding device, the roller replacement of the lower paper feed unit in the upper and lower two stages is performed by replacing the roller after removing the part that closes the opening of the stay with the upper table raised. To do so, spent a lot of time on work time. Also, with such a structure, there is a problem such as causing an accident when forgetting the work to return the removed parts, and if there is no opening in the stay, the roller in the limited area under the stay The replacement work had to be done, and work efficiency was not good. In addition, since it is difficult to check whether the roller is completely installed, the roller may not be installed at a predetermined position, causing problems such as paper jamming. This was a major problem in printer maintenance.
[0004]
An object of the present invention is to provide a paper feeding device in which the paper feeding roller and the separation roller can be easily replaced and stable paper conveyance can be obtained.
[0005]
[Means for Solving the Problems]
The object is to provide two paper feed rollers having a plastic snap fit for retaining, a separation roller, a drive roller drive shaft having a snap fit groove, a rotation shaft of the separation roller, and a paper feed. A paper pick unit composed of a motor for driving a roller, a paper stacking table, a wire for moving the table up and down, a pulley, a paper stacking unit composed of a motor for raising and lowering the table, and a sheet when the table moves up and down A paper feed unit composed of a paper guide serving as a paper guide on the pick unit side and a paper guide unit provided with a roller cover that can be opened and closed around the paper feed roller and the separation roller is provided in two upper and lower stages. In a paper feeder equipped with a structured frame, the stay that separates the upper and lower two-stage paper feeders is made of plastic that closes the openings and the openings. It is achieved by the configuration having a transparent cover.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
First, an example of a paper feeding device of the present invention and a printing device for printing paper fed from the paper feeding device will be described with reference to FIG. In addition, as a printing apparatus, the structure of the laser printer for cut sheets was illustrated. In this case, in particular, a sheet feeding device having two sheet feeding units having a sheet stacking capacity of 1000 sheets or more in the vertical direction is provided.
[0008]
In FIG. 3, a sheet 24 is set on the table 6, and the set sheet 24 is conveyed to the registration roller 17 by the sheet feeding roller 1, the conveying roller 15, and the timing roller 16. The sheet 24 is conveyed by the registration roller 17 in synchronization with the rotation of the drum 18, and the toner image 19 on the surface of the drum 18 is transferred to the surface of the sheet 24 by the transfer device 20. Further, the toner image 19 on the paper 24 is conveyed to the fixing device 21, and is pressed and heated by the fixing device 21 to be fixed on the paper 24. The paper 24 is transported from the fixing device 21 to the stacker 23 by the transport roll 22 and stacked. The printing operation is continued by repeating the above operation.
[0009]
Next, the configuration of the sheet feeding device will be described in detail with reference to FIGS.
[0010]
FIG. 1A shows the remaining structure of the sheet feeding device of the present invention. The paper feed unit is driven by two paper feed rollers 1 having a plastic snap fit 2 for retaining, a separation roller 3, and a paper feed roller having a snap fit groove in FIG. A shaft 1a, a rotating shaft 4 of the separation roller 3, a paper pick unit comprising a motor 5 for driving the paper feed roller 1 via the drive shaft 1a, a paper stacking table 6, and a wire 7 for raising and lowering the table 6. , A paper stacking unit including a pulley 8 and a table raising / lowering motor 9, a paper guide 10 serving as a paper guide on the paper pick unit side when the table 6 raises and lowers the paper 24, a paper feed roller 1, and a separation roller 3. It is composed of a paper guide portion provided with a roller cover 11 that can be opened and closed at the peripheral portion.
[0011]
As shown in FIG. 1B, the sheet feeding device has a sheet feeding unit provided in two upper and lower stages on the frame 12, and has an opening 13a that is closed by a transparent cover 14 between the upper and lower two sheet feeding units. The stay 13 is configured to partition.
[0012]
In FIG. 2, the paper feed roller 1 and the separation roller 3 in the lower paper pick section can be confirmed through the transparent cover 14 from the opening 13 a of the stay 13.
[0013]
1 and 2, the replacement operation of the lower feed roller 1 and separation roller 3 of the paper feeder is performed by opening the lower roller cover 11 with the upper table 6 raised, and the stay 13 If the positions of the feed roller 1 and the separation roller 3 are confirmed through the transparent cover 14 from the opening 13a and the roller is directly accessed from the lower side of the stay 13, the roller is simply fixed to the shaft by the snap fit 2 so that it is easy. Further, the paper feed roller 1 and the separation roller 3 can be attached and detached from the drive shaft 1 a and the rotary shaft 4.
[0014]
As another embodiment of the present invention, for example, the same effect can be obtained even if the stay 13 has a structure in which holes having a diameter of 10 mm or less are provided so that the sheet feeding roller 1 and the separation roller 3 can be confirmed from the upper stage. It is done.
[0015]
According to the above configuration, when the paper feed roller 1 and the separation roller 3 of the lower paper feed unit of the paper feed device having the upper and lower two paper feed units are replaced, the cover 14 that is more transparent than the opening 13 a of the stay 13 is replaced. Since the replacement operation can be confirmed visually, the sheet feeding roller 1 and the separation roller 3 can be easily replaced.
[0016]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a paper feeding device in which the paper feeding roller and the separation roller can be easily exchanged and stable paper conveyance can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a paper feeding device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a paper feeding device according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a paper feeding device and a printing device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Paper feed roller, 1a ... Drive shaft, 2 ... Snap fit, 3 ... Separation roller, 4 ... Rotation shaft, 5 ... Motor, 6 ... Table, 7 ... Wire, 8 ... Pulley, 9 ... Table raising / lowering motor, 10 ... Paper guide, 11 ... Roller cover, 12 ... Frame, 12a ... Top cover, 13 ... Stay, 13a ... Opening, 14 ... Cover, 15 ... Conveying roller, 16 ... Timing roller, 17 ... Registration roller, 18 ... Drum, 19 ... toner image, 20 ... transfer machine, 21 ... fixing machine, 22 ... transport roller, 23 ... stacker, 24 ... paper.

Claims (2)

At least a table, a sheet stacking unit composed of a wire for moving the table up and down, a pulley, and a table lifting motor; a sheet guide serving as a sheet guide for the sheet pick unit when the table moves the sheet up and down; a sheet feeding roller; In a sheet feeding device composed of a separation roller and a frame having a structure provided in two upper and lower stages,
A paper feeding device comprising an opening and a transparent cover that closes the opening in a stay that partitions the upper and lower two-stage paper feeding units. At least a table, a sheet stacking unit composed of a wire for moving the table up and down, a pulley, and a table lifting motor; a sheet guide serving as a sheet guide for the sheet pick unit when the table moves the sheet up and down; a sheet feeding roller; In a sheet feeding device composed of a separation roller and a frame having a structure provided in two upper and lower stages,
A paper feeding device, characterized in that openings provided in a stay that partitions between the paper feeding units in the upper and lower stages of the paper feeding device are a large number of holes of about φ10 mm or less.

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