JPH0691970A - Printer apparatus - Google Patents

Abstract

PURPOSE:To provide a recording type printer device of small size for forming toner images on an image bearing body and transferring them on the sheet, and make the device small and thin in size. CONSTITUTION:The printer apparatus having a printing process unit is that toner Images are formed on the hopper 2 having sheet housed therein and rotating endless image bearing body 10 at the toner image forming parts 11,12.13. and the toner images are transferred on the sheet forwarded from the hopper 2 at a transferring part 14, and thereafter it is fixed at a fixation part 17. The transportation path of sheets is formed into a U-shape, and the hopper 2 is arranged on the U-shaped transportation paths, and a printing process unit is provided between the U-shaped transportation paths, and thus toner images are transferred by the printing process unit 1 at the opposite surface of the U-shaped transportation paths.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Prior Art (FIGS. 13 to 14) Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 3) Working Example (a) First Example (B) Description of second embodiment (FIGS. 8 to 10) (c) Description of third embodiment (FIG. 11) (d) Fourth embodiment Description of an example (FIG. 12) (e) Description of another embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording type compact printer device for forming a toner image on an image carrier, transferring the toner image to a sheet and discharging the sheet.

Due to the recent demands for downsizing and personal use, printers used as output devices for personal computers and the like are desired to be small, thin, and have a small installation area such as a desk.

With the miniaturization of personal computers, word processors, etc., this printer is required to be thin, about A4 size, and is put to practical use in wire dot printers, thermal transfer printers, etc. with a simple printing process. Has been done.

However, since the wire dot printer or the like has a low printing resolution, such a small and thin printer is required for a printer such as an electrophotographic recording system which can realize a high printing resolution.

[0006]

13 and 14 are explanatory views (No. 1) and (No. 2) of the prior art. For example, in an electrophotographic printer device, as shown in FIG. 13, a pre-charger 11 that uniformly charges the surface of the photoconductor 10 around the photoconductor drum 10 such as an organic photoconductor, a Se photoconductor, or an a-Si photoconductor. A laser optical system 12 for image exposure, a developing device 13 such as a two-component developing device, a magnetic one-component developing device, a non-magnetic one-component developing device, and a photoreceptor 1.
A transfer roller 14 for transferring the toner image on the sheet 0 to a sheet, a cleaner 15 such as a fur brush cleaner, a blade cleaner, etc., and a charge eliminating lamp 16 are arranged. A thermal fixing device 17 for fixing the image on the sheet is arranged.

In this operation, the surface of the photosensitive drum 10 is uniformly charged by the pre-charging device 11, and the optical image corresponding to the image is exposed by the laser optical system 12 to form an electrostatic latent image corresponding to the image. The developing device 13 supplies the charged toner to develop the toner.

A transfer roller 14, which is a transfer device, is disposed in the vicinity of the photosensitive drum 10 with the paper sandwiched therebetween, and electrostatically transfers the toner image on the photosensitive drum 10 onto the conveyed paper. While passing through the fixing device 17, the paper is fixed by heat and pressure, printing is completed, and the paper is discharged.

On the other hand, the residual toner on the photosensitive drum 10 after the toner image is transferred onto the paper is cleaned by the cleaner 15, the residual charge is removed by the static elimination lamp 16, the initial state is restored, and the printing operation is repeated. .

In such a printer device, it is troublesome to set the sheets one by one, so that it is necessary to provide a hopper for accommodating the sheets, and the arrangement configuration of the electrophotographic printer having the conventional hopper is required. The one shown in FIG. 14 is known.

In the structure shown in FIG. 14A, the hopper 2 is provided in the lower part of the apparatus, the paper from the hopper 2 is provided with an upward conveying path, and the printing process unit is provided in the vertical direction. After the toner image is transferred on the photosensitive drum 10 in the transport path, the toner is fixed by the fixing device 17 and discharged upward.

In the structure shown in FIG. 14B, the conveying path is linear, the hopper 2 and the printing process unit are provided in series, the paper is fed from the hopper 2 on the left side of the drawing, and the toner is transferred to the photosensitive drum 10. The image is transferred, fixed by the fixing device 17, and discharged to the right side of the drawing.

In the structure shown in FIG. 14 (C), the conveying path is formed in an S shape, and the paper fed from the hopper 2 provided at the lower part of the apparatus is turned in a U shape so that the sheet is moved along the S shape conveying path. The toner image is transferred, fixed, and discharged by the provided print process units 10 and 17.

The configuration shown in FIG. 14D is similar to that shown in FIG.
In the structure shown in (B), the discharge direction is the upper part of the device.

[0015]

However, the prior art has the following problems. In the configuration shown in FIGS. 14A and 14C, since the hopper 2 is provided inside the device, the installation area is small, but the height of the device is high, and it is not possible to achieve thinness.

In the structure shown in FIGS. 14B and 14D, the height of the device is low and the device is thin, but since the hopper 2 is outside the device, the installation area is large. Therefore, it is an object of the present invention to provide a printer device that can be made compact and thin even if a recording method for forming a toner image is adopted.

It is another object of the present invention to provide a printer device which can be installed horizontally or vertically even if a recording system for forming a toner image is used.

[0018]

1, 2 and 3 are principle diagrams (No. 1), (No. 2) and (No. 3) of the present invention.

According to the first aspect of the present invention, toner images are formed on the hopper 2 for accommodating sheets and the rotating endless image carrier 10 by the toner image forming units 11, 12 and 13, and the transfer unit 14 is formed. Toner on the sheet delivered from the hopper 2.
In a printer device having a printing process unit 1 which fixes an image after being transferred by a fixing unit 17, a transport path of the sheet is formed in a U shape, and one side of the U transport path is formed.
The hopper 2 is arranged, the print process unit 1 is provided between the U-shaped transport paths, and the toner image is transferred to the sheet by the print process unit 1 on the opposite side of the U-shaped transport path. Characterize.

According to claim 2 of the present invention, in claim 1,
A roller 30 for feeding the paper of the hopper 2 arranged on the one side to the opposite side is provided at the end of the apparatus.

A third aspect of the present invention is characterized in that, in the first or second aspect, the hopper 2 is provided at an upper portion of the apparatus, and the printing process unit 1 is provided at a lower portion of the hopper 2.

A fourth aspect of the present invention is based on the third aspect.
A discharge path 35 for discharging the sheet fixed by the printing process unit 1 to the upper part of the hopper 2 is provided, and the upper part of the hopper 2 is used as a stacker.

According to a fifth aspect of the present invention, in the fourth aspect,
A cover 39 is provided on the stacker above the hopper 2. Claim 6 of the present invention is claim 1 or 2.
In the above, the hopper 2 is provided in the lower part of the device,
The printing process unit 1 is provided on the upper part of the.

A seventh aspect of the present invention is characterized in that, in the first, second, third, fourth, fifth or sixth aspect, the printing process unit 1 is provided on the discharge side of the U-shaped conveying path.

[0025]

In the present invention, the relationship between the hopper 2, the conveying path, and the arrangement of the printing process units was examined. The hopper 2 can be installed in a small area. Therefore, it is necessary to provide the hopper 2 in the apparatus. Under these conditions, the arrangement of the transport path and the printing process unit 1 was examined as shown in FIGS. 2 and 3.

In the transport path, the height is high and it is difficult to reduce the thickness in the printing mode (FIGS. 14A and 14C) while the sheet from the hopper 2 is transported upward. Therefore, it is desirable to convey the sheet in parallel with the hopper 2.

Therefore, FIG. 2C, FIG.
As in (E) and (F), when the sheet fed from the hopper 2 is rotated toward the hopper 2 side at the end and a transport path for printing is taken, it becomes thin (for example, about 50 mm in height). 2A, 2B, 2E, 2F, and 3F because the conveyance curvature of the sheet is high, the occurrence rate of the sheet jam is high, and it is not easy to remove the sheet due to the jam.
A U-shaped transport path such as (A), (B), (C), or (D) is optimal.

Of these, FIG. 2 (E), (F), and FIG.
As in (A) and (B), at the sheet bending part at the end of the device,
The method of transferring the toner image on the image carrier 10 is difficult to realize because the space for arranging the process unit for forming the toner image on the image carrier 10 is narrowed.

In order to save the space for disposing this process unit, as shown in FIGS. 3C and 3D, the image carrier 1
When 0 is output to the outside of the U-shaped transport path and a process unit installation space is provided at the end of the device, the sheet protrudes from the device, increasing the installation area.

On the other hand, as shown in FIGS. 2 (A) and 2 (B), the print process unit 1 is provided between the U-shaped conveying paths, and the toner image is transferred on the surface opposite to the hopper 2. As a result, the space for disposing the process unit can be secured on the opposite surface, and the sheet does not stick out of the apparatus, so that the installation area can be reduced and the apparatus can be made thinner.

Further, according to the second aspect of the present invention, since the feeding roller 30 feeds it from the hopper 2 to the surface opposite to the U-shaped conveying path, even if it is made thin, the feeding is smooth and a large number of rollers are formed on the conveying curved surface. Since there is no need to provide
The number of parts can be reduced.

Next, according to the third aspect of the present invention, since the hopper 2 is provided on the upper portion of the apparatus, it is easy to fill the sheet even if it is made thin. Next, in claim 4 of the present invention, the discharge path 3
Since the sheet is conveyed to the upper part of the hopper 2 by means of 5, the hopper 2 can be used as a stacker.

Next, according to the fifth aspect of the present invention, since the cover 39 is provided on the stacker, the stacker can be placed horizontally and installed under the display of a personal computer or the like for printing. Can hold a sheet.

According to the sixth aspect of the present invention, since the hopper 2 is provided in the lower portion of the apparatus, the output sheet can be discharged from the upper portion of the apparatus by the U-shaped conveying path, which is convenient. According to the seventh aspect of the present invention, since the printing process unit 1 is provided on the discharge side of the apparatus, the fixing heat is easily dissipated, the fixing heat does not stay inside the apparatus, and the heat dissipation when thinning can be excellent. .

[0035]

【Example】

(A) Description of the First Embodiment FIG. 4 is a configuration diagram of the first embodiment of the present invention, and FIGS. 5 and 6 are partially enlarged views (No. 1) and (No. 2) of the first embodiment of the present invention. FIG. 5 and FIG. 6 are enlarged views of FIG. 4 and are divided into two.

The hopper 2 has a bottom plate 23 for supporting the paper 24.
And an upper plate 21 which is rotatable around the rotary shaft 20 and an upper plate 2
1 and a pressing spring 22 for pressing the containing paper 24 against a feeding roller 30 described later, and is provided on one surface of the U-shaped transport path at the upper part of the apparatus.

The delivery roller 30 delivers the paper 24 from the hopper 2 on one surface of the U-shaped transport path and transports it to the transport path 34 which is the surface opposite to the U-shaped transport path. However, the guide roller 32 is provided on the transport path 34 side.

A power supply / control circuit 40 of the apparatus and a print process unit 1 are provided between the U-shaped conveying paths. The power supply / control circuit 40 is provided on the feeding roller 30 side, and the print process unit 1 is installed. , Provided on the discharge side of the U-shaped transport path, particularly the thermal fixing device 17 of the printing process unit 1.
Makes it easy to dissipate heat.

A guide roller 33 for assisting the conveyance of the paper to the printing process unit 1 is provided on the conveyance path 34 which constitutes the opposite surface of the U-shaped conveyance path. The print process unit 1, as shown in the partially enlarged view of FIG.
A brush charger 11 that rotates around the rotating photosensitive drum 10 to charge the photosensitive drum 10, an optical unit 12 including a solid-state light emitting element such as an electrophotoluminescence (EL) element, an LED array, and a developing device. 1
3 and a transfer roller 14.

The printing process unit 1 uses a cleanerless process in which the cleaner of the photosensitive drum 10 is not used in order to reduce the thickness. That is, the developing device 13
Uses a one-component developer, stores the one-component developer in the stirring chamber 133, stirs the stored one-component developer by the paddle roller 134, and conveys the one-component developer to the developing chamber 132.
Then, the rotating developing roller 1 that contacts the photosensitive drum 10
30 and a blade 131 that regulates the toner (developer) layer thickness of the developing roller 130.

If spherical polymerized toner having a uniform particle size is used as the one-component developer and the transfer roller 14 is used for transferring the toner, the distance between the transfer roller 14 and the photosensitive drum 10 that sandwich the paper and the toner is small. Since the transfer voltage by the transfer roller 14 is evenly applied and the transfer efficiency can be improved, the residual toner on the photosensitive drum 10 is reduced, and the residual toner is easily collected by the developing device 13.

Further, the rotating brush charger 11 scrapes up the residual toner on the photosensitive drum 10 to restore it to a normal potential and evenly disperse it on the photosensitive drum 10. Therefore, the developing roller 130 of the developing device 13 collects the residual toner. Therefore, the residual toner can be collected by the developing roller 130 of the developing device 13 without providing a cleaner.

Further, since the brush charger 11, the optical unit 12, and the developing device 13 are provided on both sides of the photosensitive drum 10, the height of the printing process unit 1 can be reduced, and the apparatus can be thinned.

Further, in the developing device 13, even if the passage between the agitating chamber 133 and the developing chamber 132 is narrowed and installed vertically, the developer in the agitating chamber 133 is prevented from being excessively conveyed to the developing chamber 132. ing.

The heat fixing device 17 provided at the rear of the transport path 34 includes a heat roller 17a and a backup roller 17b.
The sheet is sandwiched between the heat roller 17a and the backup roller 17b, and the toner on the sheet is fixed by heat and pressure.

The discharge path 3 is provided at the subsequent stage of the heat fixing device 17.
5 and a discharge roller 36 are provided, and the paper 38 after fixing is provided.
Is discharged onto the upper plate 21 of the hopper 2 and the upper part of the hopper 2 is used as a stacker.

A manual feed guide 37 for inserting a manual feed sheet is provided on the left side of the apparatus, and the manual feed guide 37 accommodated in the apparatus is opened as shown in the figure to manually feed the sheet to the feeding roller 30. The sheet that can be inserted between the guide rollers 32 is conveyed by the feeding roller 30 through the feeding path 34, and the fed paper is fed.
0 can also be used to convey manual paper.

The operation of this printer will be described. The upper plate 21 of the hopper 2 is opened from the left end of FIG. 4 around the rotary shaft 20, the paper is set on the bottom plate 23, and the upper plate 21 is closed. Set the paper.

In order to perform printing, the paper in the hopper 2 is fed out by the feeding roller 30 and U-turned to the transport path 34. In the printing process unit 1, the brush charger 11
The photosensitive drum 10 is charged by, the photosensitive drum 10 is image-exposed by the optical unit 12, an electrostatic latent image is formed on the photosensitive drum 10, the developing device 13 develops the toner image, and the conveying path 34 is conveyed. The transfer roller 14 transfers the toner image onto the sheet to be formed.

The paper is a photosensitive drum 10 and a transfer roller 14.
While being sent to, the heat fixing device 17 heat-fixes the toner image, passes through the discharge path 35, and is discharged by the discharge roller 36 to the upper plate 21 of the hopper 2 and is stacked.

Further, the sheet inserted from the manual feed guide 37 is conveyed through the conveying path 34 by the feeding roller 30, the toner image similarly formed on the photosensitive drum 10 is transferred by the transfer roller 14, and the thermal fixing device 17 is used. The toner image is heat-fixed, passes through the discharge path 35, and is discharged by the discharge roller 36 to the upper plate 21 of the hopper 2 and stacked.

In this way, the sheet is conveyed by the U-shaped conveyance path, and the hopper 2 is arranged on one side of the U-shaped conveyance path.
The print process unit 1 is provided between the character transfer paths,
By transferring the toner image onto the sheet on the opposite side of the U-shaped transport path, the installation area of the apparatus can be made approximately the sheet size, and the height of the apparatus can be set to the height of the printing process unit 1. It is possible to make it smaller and thinner.

Further, in this embodiment, the sheets can be set from the upper part of the apparatus, the sheets can be set easily, and the hopper 2 can be used as a stacker. FIG. 7 shows the first of the present invention.
It is an explanatory view of an example usage example of.

4 to 6, the apparatus is shown installed horizontally and used, while FIG. 7 shows an example used vertically installed. In FIG. 7A, the feeding roller 3
This is an example in which the apparatus is installed vertically with the 0 side facing down, and the paper from the hopper 2 is fed by the feeding roller 30 and is conveyed upward by the conveyance path 34, so that the photosensitive drum 10
Then, the toner image is transferred onto the paper and is thermally fixed by the heat fixing device 17.

At this time, depending on the direction of the discharge path 35, the paper can be discharged in the upward, oblique, and lateral directions. Also, FIG.
In (B), it is an example in which the apparatus is installed vertically with the heat fixing device 17 side facing down, and the paper from the hopper 2 is fed by the feeding roller 30 and is conveyed downward through the conveyance path 34. The toner image is transferred onto the sheet by the photosensitive drum 10, and is thermally fixed by the thermal fixing device 17.

At this time, if the discharge roller 36 of FIG. 4 is removed, the paper can be discharged in the lateral direction. As described above, the printer device can be installed horizontally and vertically installed, and the installation area can be further reduced and the installation space on the desk can be reduced.

(B) Description of the Second Embodiment FIG. 8 is a block diagram of the second embodiment of the present invention, FIG. 9 is an explanatory view of the second embodiment of the present invention, and FIG. 10 is the second embodiment of the present invention. It is an explanatory view of a usage example of an example.

In the figure, the same components as those shown in FIGS. 4 to 6 are designated by the same symbols, 39 is a cover, which covers the stacker on the hopper 2, and is a guide 39a for the sheet. Is provided.

In this embodiment, a stacker cover 39 is provided in addition to the structure of the first embodiment shown in FIGS. 4 to 6, and in this case, as shown in FIGS. 10 (A) and 10 (C). As described above, printing can be performed by installing the display DP on the printer device PR installed horizontally.

Further, the stacker may be installed vertically beside the desk as shown in FIG. 10A or vertically as beside the personal computer PC as shown in FIG. Paper does not get scattered.

Further, as shown in FIG. 10B, a printer device PR may be installed horizontally under the display DP and a stacker ST may be installed vertically. By opening the cover 39 as shown in FIG. 9, it can be used as a vertical stacker for sheets when installed horizontally.

Incidentally, FIG. 10 (E) shows the embodiment of FIG. 4 installed laterally and used alone.
As shown in (A), it is also possible to accommodate the printer device PR related to the drawer of the desk.

(C) Description of Third Embodiment FIG. 11 is a block diagram of the third embodiment of the present invention. In the figure, the same components as those shown in FIGS. 4 to 10 are designated by the same reference numerals, and 5 is an extension unit, which is provided under the printer device and stores a paper hopper 50 for accommodating paper. A feeding roller 52 for feeding the paper of the paper hopper 50,
An abutment spring 51 that abuts the sheet on the delivery roller 52 in the sheet hopper 50, a guide roller 53 of the delivery roller 52, a guide portion 54 that guides the delivered sheet to the transport path 34 of the printer device, a memory, a fan, and the like. It has an extension circuit 55.

In this embodiment, the expansion unit 5 is provided in consideration of continuous printing of a large amount of paper because the paper hopper 2 of the printer device has a small paper storage capacity.

Since the extension unit 5 can accommodate a larger number of sheets in the sheet hopper 50, the sheets will not run out even if continuous printing is performed, and a printer buffer is provided in the extension circuit 55 to print a large amount of print data from the computer. It can be stored, reducing the load on the computer and
By providing the fan, the printing process unit 1 of the heated printer device can be cooled from the lower side by continuous operation.

Further, the extension unit 55 may be provided with a communication adapter such as a LAN, a hard disk device, a floppy disk device or the like. (D) Description of Fourth Embodiment FIG. 12 is a configuration diagram of a fourth embodiment of the present invention.

The embodiment of FIG. 12 is such that the hopper 2 is provided in the lower part of the apparatus in the configuration of the embodiment of FIGS. 4 to 6. That is, at the lower part of the apparatus, a hopper 2 is provided in which a sheet is accommodated on the bottom plate 21, is pressed by the upper plate 23, and is pressed by the pressing spring 22 against the feeding roller 30.

Then, the sheet of the hopper 2 is delivered to the transport path 34 at the upper part of the apparatus by the delivery roller 30 and is transported to the printing process unit 1, and the toner image on the photosensitive drum 10 is transferred by the transfer roller 14 and heat-fixed. The toner image is fixed by the container 17 and discharged to the left at the left end of the apparatus.

If the hopper 2 is constructed so that it can be inserted and removed from the left end or the right end of the apparatus, it becomes easy to set sheets. With this arrangement, when the printer device is installed horizontally, the paper is ejected from the upper part of the printer device, which is convenient for taking out and can be installed vertically.

(E) Description of Other Embodiments In addition to the embodiments described above, the present invention can be modified as follows. Although the photosensitive drum 10 has been described as having a drum shape, it may have an endless belt shape.

In the above embodiment, the printing process unit 1 is described as an electrophotographic mechanism, but it can be used for other printing mechanism for transferring a toner image (for example, electrostatic recording mechanism, optical backside recording mechanism, etc.). The sheet is not limited to paper, and other media can be used.

An endless transfer belt or transfer charger may be used as the transfer roller of the transfer means. Although the EL (electroluminescence) optical system has been described as the optical unit, it can also be realized by using a laser optical system, an LED optical system, a liquid crystal shutter optical system, or the like.

Although the developing device has been described as one-component non-magnetic developing, a well-known developing method such as two-component magnetic brush developing method and magnetic toner developing method may be used. Although the printer device has been described as the output device of the computer, it may be used for a copying machine, a facsimile or the like.

When the device is installed vertically, a stand or the like may be provided to improve the stability. Although the present invention has been described with reference to the embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0075]

As described above, according to the present invention,
It has the following effects. The transport path is U-shaped, a hopper is provided on one side of the U-shaped transport path, the print process unit is placed between the U-shaped transport paths, and the print process unit is arranged to transfer to the sheet on the opposite side of the U-shaped transport path. Therefore, the size can be the size of the sheet and the height can be the height of the printing process unit, so that a small and thin printer can be realized.

Further, it can be installed vertically, which contributes to a reduction in installation space particularly on a desk or the like, and the desk or the like can be effectively used.

[Brief description of drawings]

FIG. 1 is a principle diagram (1) of the present invention.

FIG. 2 is a principle diagram (2) of the present invention.

FIG. 3 is a principle diagram (3) of the present invention.

FIG. 4 is a configuration diagram of a first embodiment of the present invention.

FIG. 5 is a partially enlarged view (No. 1) of the first embodiment of the present invention.

FIG. 6 is a partially enlarged view (No. 2) of the first embodiment of the present invention.

FIG. 7 is an explanatory diagram of a usage example of the first embodiment of the present invention.

FIG. 8 is a configuration diagram of a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of the second embodiment of the present invention.

FIG. 10 is an explanatory diagram of a usage example of the second embodiment of the present invention.

FIG. 11 is a configuration diagram of a third embodiment of the present invention.

FIG. 12 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram (1) of the conventional technique.

FIG. 14 is an explanatory diagram of a conventional technique (No. 2).

[Explanation of symbols]

 1 Printing Process Unit 2 Hopper 10 Photosensitive Drum (Image Carrier) 11 Brush Charger 12 Optical Unit 13 Developer 14 Transfer Roller 17 Thermal Fixer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kunihiko Sato Kunihiko Sato 1015 Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Fujitsu Limited (72) Inventor Masatoshi Kimura 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Within Fujitsu Limited

Claims (7)

[Claims] 1. A toner image forming unit (11, 12, 13) forms a toner image on a hopper (2) for accommodating a sheet and a rotating endless image carrier (10), and a transfer unit (14). ), The toner image is transferred to the sheet fed from the hopper (2), and then the printer apparatus having a print process unit (1) for fixing the toner image in the fixing unit (17) is used. It is formed in a U shape, and the hopper (2) is arranged on one side of the U-shaped conveyance path, and the printing process unit (1) is provided between the U-shaped conveyance paths, and A printer device, wherein a toner image is transferred to the sheet by the printing process unit (1) on the opposite side. 2. The printer apparatus according to claim 1, further comprising a feeding roller (30) provided at an end portion of the apparatus for feeding a sheet of the hopper (2) arranged on the one surface to the opposite surface. 3. The printer device according to claim 1, wherein the hopper (2) is provided on an upper portion of the apparatus, and the printing process unit (1) is provided on a lower portion of the hopper (2). 4. A discharge path (35) for discharging the sheet fixed by the printing process unit (1) to the upper part of the hopper (2) is provided, and the upper part of the hopper (2) is used as a stacker. The printer device according to claim 3, wherein 5. The printer device according to claim 4, wherein a cover (39) is provided on the stacker above the hopper (2). 6. The printer device according to claim 1, wherein the hopper (2) is provided at a lower portion of the apparatus, and the printing process unit (1) is provided at an upper portion of the hopper (2). 7. The printer device according to claim 1, wherein the printing process unit (1) is provided on the discharge side of the U-shaped transport path.