JPS6322439A - Recording device having refeeding means - Google Patents

Abstract

PURPOSE:To continuously carry out both side copying by refeeding plural sheets which are sent out of a sheet cassette and copied on their top faces, one sheet at a time from an intermediate tray on which said sheets are accumulated in a lump. CONSTITUTION:Sheets of paper 7 are fed one sheet at a time from a cassette 6 by means of a roller 5 and conveyed 4, 3, a latent image is transferred 8 from a sensitizing drum 1, and the sheet of paper 7 is conveyed 21 and the image is fixed 22. In the case of one side copying, the sheets of paper are discharged onto a tray 26 by means of a discharge roller 24 and due to a gate 8. At the time of both side copying, the sheets of paper are accumulated in a lump on an intermediate tray 27 due to the gate 28. Then, the sheet of paper 7 is fed back by means of rollers 29, 30 and conveyed up to the top side of the cassette 6 by means of rollers 31, 32 and a guide plate 33. Based on the direction of both side copying, the inverted sheet of paper 7 the top side of which was already copied is conveyed 4, 3 by means of a spacer roller 75 which is coaxial with, while having a smaller diameter than that of the roller 5, subjected to a treatment similar to that on the top face, and discharged out onto the tray 26. Thereby, the mechanism can be simplified, enabling continuous both side copying.

Description

[Detailed description of the invention] The present invention relates to a recording apparatus having a refeeding means.

Conventionally, refeeding means for double-sided recording devices required a feeding means for refeeding because the conveyance paths for feeding from sheet stacking means (cassettes, etc.) and refeeding were different. . In addition, there are some devices that can be used for both feeding and re-feeding, but in this case, they have only been able to handle recording one sheet at a time.

The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a recording apparatus having a refeeding means that can handle recording of a plurality of sheets.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are enlarged sectional views showing important parts of the conveyance path. In the figure, an image of a document placed on a document stacking table 19 is illuminated by a halogen lamp 17, and mirrors 16, 15.
An image is formed by a lens 14 and a mirror 13 onto a tram l covered with an optical semiconductor. The tram 1 is uniformly charged by a charger 12, and after an image is exposed on the tram 1, it is transferred to a developer 2.
The toner image is visualized on the tram l by the toner image. Then, the visible image is transferred by a transfer charger 8 onto a sheet that is conveyed in a timely manner by a register roller 3, and the latent image and toner image remaining on the drum 1 are then transferred to the drum 1 by a lamp 10 and a cleaner 11. removed from above. On the other hand, the seed door is stored in a cassette or the like 6, and is sent out by a half-moon-shaped paper feed roller 5 (Fig. 4) and a register roller 3 in synchronization with the toner image on the drum l, and is transferred by a transfer charger 8. After that, it is separated from the drum 1 by a separation roller 9, and sent through a conveying section 21 to a fixing device 22 such as a heat fixing device.

For normal one-sided copying, use the flap 28 for copying after fixing.
is located at the position shown in FIG. 1 (solid line position in FIG. 2), and is transported onto the first tray 26 by the transport rollers 23 and 24. In the case of double-sided copying, for a sheet on which only the front side (one side of both sides) has been copied, the flap 8 is moved counterclockwise as shown in the figure to the position shown by the two-dot chain line in FIG. By rotating the first tray 26 by rotating the first tray 26, a second tray 26 for storing sheet-time, which is integrally formed with the first tray 26, is placed directly below the first tray 26.
The required number of sheets are stored in the tray 27, and then the sheets are sequentially separated and discharged by a pair of reversing rollers 29 and 30 at an appropriate timing. The tray is the first tray 26
A two-tiered tray system in which the first and second trays 27 are integrated constitutes a so-called intermediate tray in double-sided copying.
It is also possible to integrate the second trays 26 and 27, the separation conveyance section, and the flap mechanism (unitization). If these units are driven by the drive system of the fixing section, the units can be easily attached and detached by removing the electrical wiring connector 48 (FIG. 2). In this case, it is also possible to convert it into a general single-sided copying machine by independently attaching another normal paper ejection unit, such as a paper ejection roller and tray, to the main body. Next, the sheets sent out from the separating and conveying sections 29 and 30 are moved to the overall standard position by diagonal feeding sections 31, 32, 33, and 34 for moving the sheets to the standard position, and then the sheets 7 of the cassette 6 are moved to the standard position. The guide 33.3 maintains a constant distance between the axis of the paper feed roller 5 and the axis of the paper feed roller 5, and moves the guide 33.
4 and be guided. Next, as with the front side copying, timing is taken, and the sheet with the front side copied is sent out preferentially by the paper feed roller (half-moon roller) 5, and after transfer and fixing, the sheet is sent out by the conveyance roller 23.
- 24 and is carried out onto the first tray 26.

Next, details of each part will be explained. In FIGS. 2 and 3, a unit section including sheet discharge after the fixing device 22, first and second trays 26 and 27 (hereinafter also referred to as two-tier trays), and sheet separation and conveyance sections 29 and 30 will be explained. do.

This part is a unit in which each component is attached to a side plate 47 (also in the front), and is slidable and rotatable through the elongated hole 471 of this side plate 47 or the shaft 45.
The shaft 45 is connected to the lower stay 80 of the fixing device 22 via the shaft support plate 61.
It is held in place with screw 60. The shaft of the conveying roller 23 passing through the side plate 47 enters into the round notch 64 of the lower plate 46 of the fixing device 22. The driving force is the fuser 22
Drive gear 22. is transmitted to the drive gear 223 of the unit by a gear train 222 (broken line), so that when a sheet jams, the entire unit can be opened using the shaft 45 as a fulcrum as shown by an arrow 62, and the guide plate 40 is rotated around the bin 43 as a fulcrum. Furthermore, the first tray 26 can be freely opened around the pin 44.

The entire unit can be easily removed by removing the screw 60 and connector 48, and can be similarly easily installed.

After leaving the fixing device 22, the sheet is separated by a separator 81, passes through a conveyance roller 23, and then is sent to a solenoid 37, lever 36,
A flap mechanism 28 constituted by a spring 38 divides the sheet into its path, and in the case of single-sided copying, the sheet passes through the conveying roller 24 and is stored in the first tray 26, and in the case of double-sided copying, the sheet whose front side has been copied is stored in the first tray 26. A predetermined number of sheets are temporarily stored in the second tray 27, which has a layered structure, and then the sheets are separated and conveyed one by one by a separation conveyance mechanism consisting of a pressure point roller 30 and a reversing roller 29 facing oppositely thereto. . In addition,
The rollers of this separating and conveying mechanism may be other types such as a belt that rotates in a counter-rotating manner, and if a belt is used, the separating property is better. At this stage, these sheets are generally misaligned in the width direction with respect to the position of the toner image on the tram l, so it is necessary to move such sheets to the reference position and correct them. . For this purpose, a diagonal sheet conveyance section is required.

Next, the diagonal conveyance section will be explained with reference to FIGS. 5 and 6. The sheet sent out from the separation conveyance section is moved by a drive roller 31 mounted at an angle of 0 degrees (approximately 10 to 20 degrees) with respect to a reference guide 74 that determines a reference position, and a spring plate 73 that also serves as a bearing opposite to the drive roller 31. As the sheet is fed between the driven rollers 32 in contact with the driving roller 31 under a predetermined pressure, the sheet is pressed toward the reference guide 74 because of the zero inclination angle of both rollers. Since the sheet is naturally advanced in a slipping state between the sheet and both rollers 31 and 32, appropriate pressing force and material are selected and used.

In addition, the drive of the diagonal conveyance unit is transmitted from other units by a belt or a helical gear, and its speed is faster than other process speeds. Fixes and prevents slowdowns. In this case as well, the belt is not limited to rollers, and any combination such as a belt or one belt and the other a guide plate or rollers is possible.

Furthermore, as shown in FIG. 1, by sharing the lower guide plate 33 and the driven roller 32 with the lid of the cassette 6, the lower guide plate and the driven roller 32 can be removed together with the cassette 7 or independently. Can be done. As a result, it can be made detachable together with or independently of the above-mentioned unit in the discharge section, and it becomes easy to handle jams in the diagonal conveyance section.

Next, details of the paper feed roller section will be explained with reference to FIG. As shown in the figure, the paper feed roller 5 has a half-moon shape with a part of its circumference cut out, and the paper feed roller 5 has a roller 75 smaller in diameter than the half-moon-shaped paper feed roller 5. The half-moon roller 5 and the sheet 7 are in contact with each other with a predetermined pressure, and the distance between the half-moon roller 5 and the sheet 7 is kept constant to suppress flapping of the sheet during paper feeding. At the same time, the sheet that has been brought to the reference position in the diagonal conveyance section is moved by the guide plates 33 and 34 to the roller 75 and the sheet 7.
(Fig. 4 a), the difference in diameter between the rollers 75 and the half-moon roller 5 ensures that the double-sided copying sheet (front-side copying sheet) comes first when the paper feed roller 5 rotates next time. It is about to be sent out.

Also, since there is a difference in length between the start position of the sheet in the cassette 6 and the start position of the double-sided copy sheet as shown in the figure, if the paper feed roller 5 rotates the same number of revolutions as in the case of single-sided copying, Since the amount of feed of the sheet differs depending on the length, the amount of loop formed when the sheet hits the register roller 3 for the timing when the sheet stops differs, and in some cases, it may cause paper feeding failure, bending of the sheet, etc. This may cause trouble, but in this case, change the number of rotations of the paper feed roller 5, for example, twice for one-sided copying and three times for double-sided copying, and rotate the half-moon roller so that the same loop occurs. It is preferable to control the length of the paper feed section 5. Further, as shown in FIG. 7, two or more notches are formed in the paper feed roller to form the paper feed section as a first divided paper feed section 79 and a second divided paper feed section 80, and By appropriately controlling the number of rotations, for example, 2 times for single-sided copying, 234 times for double-sided copying, etc., it is possible to obtain a more accurate sheet feeding length with no difference.

Next, referring to FIG. 8, a two-stage tray will be explained. 1st
The two-stage tray composed of the second tray 26 and the second tray 27, which is an intermediate tray for double-sided copying, is preferably constructed in one piece and is arranged so as to protrude outside the machine. A long hole 35 is provided on the top surface of the first tray 26.
- Either one or both of the notches 36 are provided, and when making the final copy, the presence or absence of sheets in the second tray 27 can be checked from above the first tray 26, and the second tray 27 can be checked by double feeding of sheets. You will be asked to confirm the number of sheets remaining in the tray 27, so you will be asked to check for double feeding. In addition, the elongated hole 35 and the notch 3
For position 6, the size of the sheet to be used and the ejection position must be appropriately considered.

Further, by arranging a large number of elongated holes 35, the frictional force between the tray surface and the sheet can be reduced, and the notch portion 36 can also make it easier to remove the sheet on the first tray 26.

By covering the first tray 26 with a transparent lid, it is possible to prevent dust and hands from touching the sheets of the second tray 27, and the entire two-tier tray is made of transparent resin or the like. Good too.

Next, referring to FIG. 9, an embodiment will be described in which the tray unit is used for a single-sided recording machine or the like. The tray unit section 81 includes a first tray 82, a paper ejection roller 83. Static eliminator 84. It consists of guide plates 85, 86, etc., and is removable from the machine body, and is used for conveying rollers 23, 24, . . . of the double-sided recording machine shown in FIG. First tray 26. second tray 2
7. Flap 28. It can be replaced with a double-sided tray unit consisting of a pair of reversing rollers 29, 30, etc. By replacing this unit, other parts can be changed and
There is almost no need for replacement, and it can be easily applied as a single-sided or double-sided recording machine. In addition, in this example,
This is an example in which the driving roller and driven roller arranged at the upper part of the cassette 6 are excluded. The other parts are numbered the same as those in FIG. 1, and their explanation will be omitted.

As described above, the recording apparatus according to the present invention has the advantage of being able to continuously refeed a plurality of sheets with a simplified configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment to which the present invention is applied, FIGS. 2 and 3 are enlarged sectional views of important parts of the conveyance path, FIG. 4 is a partial enlarged sectional view of the paper feed section, and FIGS. Fig. 6 is a plan view and side view of the diagonal conveyance section, Fig. 7 is a partially enlarged sectional view of another paper feeding section, Fig. 8 is an enlarged perspective view of the tray section, and Fig. 9 is an example of another copying machine. FIG. In the figure, 6 is a cassette 26, a first tray 27, second trays 33 and 34, guides 29 and 30, a pair of reversing rollers 81, a tray unit section 82, and a first tray 83, which are paper ejection rollers.

Claims (1)

[Claims] (1) Sheet loading means; One sheet at a time from the above sheet loading means. a feeding means for feeding the two separately; The sheet fed by the above feeding means a recording processing unit for recording; Recorded by the recording processing section above a tray means for stacking a plurality of sheets; Separate sheets one by one from the above tray means. a re-feeding means for separating and feeding; Sheets fed by the above refeeding means a conveying means for guiding the sheet to the sheet loading means; A recording device having