JPH0455258A - Picture image forming equipment - Google Patents

Abstract

PURPOSE:To improve curl correction for both high quality paper sheets and regenerated paper sheets by judging whether a transcript material is a high quality paper sheet or a regenerated paper sheet, and enlarging the deformation of an elastic roller of a pair of correction rollers in a regenerated paper sheets. CONSTITUTION:A pair of curl correction rollers 18 consist of a rigid roller 18a and a rubber roller 18b. The rigid roller 18a is supported with a shaft on a guide plate 23a side of a transcript material transfer channel 23 and rotationally drived. The shaft of the rubber roller 18b is inserted in a long hole 24a in an arm 24 on a guide plate 23b side, and energized with a spring 25. A circular cam 26 is inserted in a circular hole on the upper portion of the arm 24, and the eccentric portion 26a of which is fixed to a shaft of gears 27, and a motor 29 is connected to the shaft of gears 28 engaging with gears 27. The arm 24 is supported by the cam 26 and swung around a pin 30. When a transcript paper sheet inserted in the transfer channel 23 is judged to be a regenerated paper sheet by a judging means, the motor 29 is operated to swing the arm 24, then the rubber roller 18b can be brought in pressure contact and deformed into the roller 18a to correct the curl of the regenerated paper sheet reliably.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to an image forming apparatus such as a copying machine, a printer, etc.
More specifically, the present invention relates to an image forming apparatus having a curl correction roller for a transfer material.

(B) Prior Art Conventionally, image forming apparatuses have adopted a structure that corrects the curling of transfer material when it is ejected, in order to improve the stacking performance of ejected sheets.

Examples of methods that can be applied to the above conventional configuration include forcibly passing the transfer material through a curved conveyance path, and as shown in FIG. The elastic roller b is deformed by the pressure contact force, and the transfer material is pinched and pressed between the nip portion of the pair of correction rollers.
By conveying the transfer material, the transfer material is given a reverse curl, thereby correcting the curl that has already occurred.

(c) Problems to be Solved by the Invention However, the amount of curl varies depending on the paper type of the transfer material. The paper quality that causes curling is influenced by 1) fiber orientation, 2) moisture content, 2) difference between front and back fibers, and 2) dimensional stability.

For example, recycled paper recycled from newspapers, etc. can be used as a raw material for GP
(clumps of fibers), and the fibers in (■) have poor orientation, resulting in large curls.

In the conventional example, curls are corrected regardless of the paper type, so if the curls are large, such as recycled paper, the curls cannot be corrected completely.

Then, especially when discharging the paper from the discharging roller to the tray of the sorter, if the distance between the discharging roller and the sorter's 1st to 3rd tray is narrow, the transfer material P to be discharged may already be loaded, as shown in FIG. This may interfere with the curled rear end of the transfer material P, which is being rolled, resulting in poor paper stacking properties.

Also, if you change the curl correction roller to match the recycled paper and set it to ``C'', the high-quality paper will end up with excessive reverse curls, and the transfer material in tray There was a problem that P was poorly loaded.

Therefore, the present invention provides a discriminating means for discriminating whether the transfer material is recycled paper or high-quality paper, and also provides a curl correction roller consisting of a rigid roller and an elastic roller on the downstream side of the fixing device. By making the amount of deformation of the elastic roller larger than the amount of deformation for high-quality paper when it is determined that the paper is recycled paper, regardless of whether it is double-quality paper or recycled paper,
It is an object of the present invention to provide an image forming apparatus that prevents discharge and loading failures caused by curling of transfer materials.

(d) Means for solving the problem The present invention has been made in view of the above circumstances, and includes:
For example, referring to FIGS. 1 to 3, the transfer material (P
) of the image forming apparatus (1) transfers the image to the image forming apparatus (1), and the fixing part 02) fixes the transferred image to the transfer material (P). Material (
A curl correction device comprising a discriminating means (33) for discriminating whether P) is recycled paper or high-quality paper, and a rigid roller (18a) and an elastic roller (18b) on the downstream side of the fixing device (12). A pair of rollers (18) are provided, and the transfer material (I) is
) is determined to be recycled paper by the determining means (33), the deformation amount of the elastic roller (18b) of the curl correction roller pair (18) is set to be larger than the deformation amount for high-quality paper. It is characterized by

(e) Based on the structure of ``--, the transfer material (P) is fed to the transfer section (7) of the image forming device (1), and the image is transferred to the transfer material (P).
). Next, the transfer material (P) on which the image has been transferred
is conveyed to the fixing section (12) and the image is fixed on the transfer material (P). At this time, the determining means (33) determines whether the transfer material (1)) is recycled paper or high-quality paper, and once it is determined that the transfer material (P) is recycled paper, curl correction is performed. The amount of deformation of the elastic roller (18b) of the roller pair (18) is made larger than the amount of deformation for the high-quality paper to correct the curl of the transfer material (P), which is recycled paper.

Note that the symbols in the parentheses are illustrative and do not limit the structure in any way.

(f) Example Embodiments of the present invention will be described below along with the drawings.

FIG. 1 shows the entire copying machine 1. As shown in FIG. In the figure, reference numeral 2 denotes the original transport unit, which transports the original transported onto the platen 3 through the optical system 4.
A latent image is formed on the photosensitive drum 5 by the light beam scanned by , and toner images 1 to 1 are formed by the developing device 6 , and transferred to the transfer section 7 .
At this time, the toner images 1 to 1 are transferred onto the transfer material P fed from either the transfer material P loading table 8 or the cassettes 1-9 and 10. Then, the transfer material P on which one toner image has been transferred is transported by the transport section 11 to the fixing section 12, and the toner image is fixed on the transfer material P.

Note that reference numeral 13 is a paper refeed conveyance path for multiple image formation. Further, reference numeral 14 denotes a reversing section, and when the sheet is reversed at the reversing section 14 and then re-fed through the re-feed conveyance path 13, images are formed on both sides.

Then, the transfer material P with the image fixed thereon is transferred to the transport roller pair 1.
5.16, the transfer material P is conveyed to the sorter 21, further passed through the roller pair 17, and conveyed to the curl correction roller pair 18, and the curl-corrected transfer material P passes through the roller pair 19. They are classified and stored.

Note that 22 (22, 222...) is a transfer material storage bin of the sorter 21.

Next, regarding the pair of curl correction rollers 18, FIGS.
A detailed explanation will be given with reference to the drawings.

In FIG. 2, the curl correction roller pair 18 consists of a rigid roller 18a and a rubber roller 18b.
a is pivotally supported on the guide plate 23a side of the conveyance path 23 for the transfer material P, and is driven to rotate in accordance with the conveyance speed of the transfer material P by a drive source (not shown).

Further, the shaft of the rubber roller 18b is guided through a horizontally oriented elongated hole 24a in the lower end of the arm 24 on the guide plate 23b side, and is urged rightward by a spring 25.

A circular cam 26 is inserted into the circular hole in the upper square of the arm 24 with almost no play, and an eccentric portion 26a of the cam 26 is fixed to the shaft of a gear 27.

Further, a gear 28 meshes with this gear 27 from the left side, and a motor 29 is connected to the shaft of this gear 28.

In addition, a long hole 2 facing the vertical direction is provided at one end of the arm 24.
4b is provided, and this elongated hole 24b is provided with a fixed bottle 30.
It is fitted in.

Therefore, the arm 24 is supported by the cam 26 and supported by the bin 30 in the left-right direction so as to swing in the direction of arrow C.

Further, when the arm 24 is in a substantially vertical position and the rubber roller 1
A switch 31 is provided which is turned on by contacting the right side surface of the intermediate portion of the arm 24 in a state where the arm 8b is elastically deformed and pressed against the rigid roller 18a.

In addition, as shown in FIG. 3, which corresponds to A homeland in FIG. It is written on the bottom of the paper, and a lever 33 is provided to move in accordance with the marking on the nameplate 32.

Then, as shown in FIG. 4, which is the homeland of B, the lever 33
A switch 34 that is turned on at the high-quality paper position and a switch 35 that is turned on at the recycled paper position are provided.

Next, the function of the curl correction roller pair 18 in this embodiment will be explained.

When the operator loads recycled paper and makes copies, the lever 33
(Figures 3 and 4) and set it in the recycled paper position. The switch 35 is turned on by the lever 33. Then press the copy button. Then, the copying machine main body 1a recognizes that the transfer material P is recycled paper, and starts the motor 29 (second
(Figure). When the switch 31 is not turned on, the motor 29 moves the rollers 18a and 18 as shown in FIG.
After b is separated, the motor 29 starts rotating, swings the arm 24 to the right due to the eccentricity of the cam 26, and turns on the switch 31 to stop the motor 29.

Then, the rubber roller 18b is deformed and the rigid roller 18a is
The recycled paper is pinched and conveyed by the nip section that is in pressure contact with the paper, and the curls of the recycled paper are corrected. Since the transfer material P is stored in the bin 22 as described above, the transfer material P is stored in an orderly manner.

Further, when copying high-quality paper, when the lever 32 is set to the "high-quality paper position," the switch 34 is turned on. When the switch 31 is on, the motor 29 rotates a predetermined amount to make a copy. The pair of rollers 18a and 18b are separated to the state shown in FIG. 5.The high-quality paper is then neatly stored in the bin 22 as described above without undergoing curl correction and without reverse curling.

In the above, the curl correction roller pair 18 may be located anywhere downstream of the fixing device 12.

Next, another embodiment will be described with reference to FIGS. 6 and 7.

In this embodiment, a switch 36 is further provided in the above embodiment, and the rubber roller 18b is turned on by contacting the left side surface of the intermediate portion of the arm 24 which is in contact with the rigid roller 18a due to a small amount of deformation. It's supposed to be.

When the operator operates the lever 33 (FIG. 4) described above to copy high-quality paper, the switch 34 is turned on. Then, the motor 29 rotates once, and the gears 28 and 2 rotate.
7. When the switch 36 is turned on via the cam 26 and the arm 24, the motor 29 is stopped and the amount of deformation of 8b is reduced.

When copying recycled paper, the lever 33 is moved to the recycled paper position, the switch 35 is turned on, the motor 29 is rotated, and the arm 24 is stopped when the switch 31 is turned on. Then, the amount of deformation of the roller 18b is increased.

(g) Effects of the invention -] 2. As explained above, according to the present invention, when the determining means determines whether the paper is a transfer material or a recycled paper, the amount of deformation of the elastic roller of the pair of curl correction rollers is determined. By making the amount of deformation larger than the amount of deformation for double-quality paper, curls can be corrected for both quality paper and recycled paper, and good paper ejection and stacking can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of a copying machine embodying the present invention, Fig. 2 is a side view of a pair of curl correction rollers, Fig. 3 is a parent view of A in Fig. 1, and Fig. 4 is a parent view of B in Fig. 3. , FIG. 5 is a side view showing the state of the pair of curl correction rollers for double-quality paper, FIGS. 6 and 7 are side views of other embodiments, and FIG. The figure shows the state of the curl correction roller pair for recycled paper, FIGS. 8 and 9 are side views showing the state when the transfer material is stored in the sorter of a conventional copying machine, and FIG. 10 shows the state of the curl correction roller pair for recycled paper. FIG. 3 is a side view showing a pair of correction rollers. 1... Image forming device (copying machine), 7... Transfer section,
12... Fixing section, 18... Curl correction roller pair,
18a...Rigid roller 18b...Elastic roller (rubber roller) 33...Discrimination means (lever)
P...Transfer material

Claims (1)

[Claims] 1. An image forming apparatus in which a transfer section of an image forming apparatus transfers an image onto a transfer material, and a fixing section fixes the transferred image on the transfer material, wherein the transfer material is recycled paper. a discriminating means for discriminating whether the transfer material is recycled paper or high-quality paper; and a curl correction roller pair comprising a rigid roller and an elastic roller on the downstream side of the fixing device, and the discriminating means discriminating whether the transfer material is recycled paper. An image forming apparatus characterized in that the amount of deformation of the elastic roller of the pair of curl correction rollers is larger than the amount of deformation of the high-quality paper when determined by a means.