JP2540257Y2 - Paper feeder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder of the type using roll paper as a transfer material.

[0002]

2. Description of the Related Art As one of general paper feeders of an image forming apparatus utilizing electrophotography, there is known an apparatus in which a plurality of roll papers having different sizes are loaded. In such an apparatus, one of the selected sizes of the roll paper is sent to a cutter, where it is cut to a predetermined length and transported to a transfer section for transfer of a toner image. Each roll paper is loaded in the storage unit so that it can be unwound, and a paper feed roller corresponding to the roll paper of the size rotates to draw the roll paper to a cutter based on an operator's size instruction.

Each roll paper is sent to a cutter through a common path. For this reason, when switching to roll paper of a different size, the leading end of the roll paper of the size before being pulled out to the cutter is retracted from the common path before feeding the roll paper of the selected size, and the selected roll paper is removed. It must be out of the way of paper traffic. For this reason, the paper feed roller of the roll paper to be retracted is rotated in the reverse direction to retract the leading end. At this time, since the roll paper main body remains in the stopped state, the portion of the roll paper that has been pulled back becomes slack. Conventionally, this slack is absorbed by providing a space of an appropriate size in the roll paper storage section.

[0004]

By the way, the roll paper container wall is generally formed of metal or plastic, and such slack is positioned so as to come into contact with the container wall. If the roll paper is left unattended in this state, particularly when placed in a low-temperature, low-humidity environment, a phenomenon may occur in which the transfer loss occurs in a portion that has been in contact with the housing wall. For example, when the power of the image forming apparatus is once turned off, left for a relatively long time, and then turned on again to start up, the temperature inside the image forming apparatus is considerably lower than during operation. For this reason, dew condensation occurs on the surface of the housing portion inner wall formed of the above-described metal or plastic, and the slack portion of the roll paper comes into contact with this, and moisture adheres, and at the time of transfer in the image forming process performed thereafter, Missing transfer occurs.

[0005]

For this reason, the paper feeder according to the present invention is formed of a pulp material on an inner wall of a storage portion for storing the roll paper to which a part of the unwound roll paper can come into contact. Paper material provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a roll paper storage unit 1. The roll paper storage unit 1 forms a part of the image forming apparatus, and a plurality of roll paper storage units 1 are provided corresponding to roll paper of each size to be loaded. Housing 1
1 is formed in a box shape having an open upper part defined by the housing part walls 2 and 3 and both side plates (not shown). 4 is loaded. The roll paper 4 is supported by a shaft center 5 and is rotatably mounted on the apparatus by a bearing (not shown), that is, unwound. The inertia at the time of pulling out the roll paper 4 is suppressed by a brake mechanism (not shown) as necessary.

FIG. 1 shows a state in which the paper feed roller 6 is rotated in the reverse direction and the leading end of the roll paper is retracted from the common path. It is located in contact with a few. In order to prevent the transfer portion from coming off at the contact portion, a pulp material is provided at a portion of the storage portion walls 2 and 3 where the roll paper can contact. FIG. 2 shows an example of such a configuration, and shows a configuration in which pulp materials 9 are bonded to metal bases 8 with adhesives 10 for the housing portion walls 2 and 3. The pulp material may be a commercially available coated cardboard, most preferably of substantially the same quality as the roll paper, and the thickness is preferably as large as possible. .

Further, since the pulp material has a danger of burning, it is possible to prevent overheating by bonding it to a metal or a flame-retardant plastic as the base 8.

In such a configuration, a temperature of 10 to 35
As a result of a test in an environment range of 20 ° C. and a humidity of 20 to 85%, a clear copy was obtained without any transfer omission. In addition, as shown in FIG.
It is more effective to provide a pulp material at a portion where the roll paper can contact, such as 1.

As described above, according to the present invention, a copy image without transfer omission can be formed by leaving the rolled paper that has become slack.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a paper feeding device according to the present invention.

FIG. 2 is a diagram showing a configuration of a housing wall. 1 paper feeder 2 paper feed wall 3 paper feed wall 4 roll paper 7 slack

Claims (1)

(57) [Scope of request for utility model registration] An unwound roll paper may come into contact with a part of the roll paper.
Pulp material is applied to the inner wall of the storage section for storing the roll paper.
A paper feeding device provided with a paper material formed in a predetermined shape.