JPH0233621B2 - MAKIGUSEKYOSEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a curl correction device for roll paper, film, etc.

(Prior art) Conventionally, this type of curl correction device includes, for example, an endless belt that rotates from an inlet to an outlet, and a roller that presses against the endless belt, and curled paper or the like is inserted from the inlet. There is a device that corrects curl by passing paper between an endless belt and a swinger to return the warp (see Japanese Patent Publication No. 54-39550). However, with this configuration, although it is possible to manually adjust the pressing action of the idler against the endless belt, there is no means for specifically detecting the amount of curling or the remaining amount of paper or the like.

Generally, in roll paper, etc., the smaller the roll diameter, the stronger the degree of curling. Therefore, curl correction is not so necessary in areas where the roll diameter is large, but becomes necessary as the roll diameter becomes small. However, in the conventional example, unless the pressing force of the roller is adjusted visually, the correction is uniformly performed regardless of the size of the roll diameter. There was a problem that correction was insufficient in small areas.

Another conventional example includes means for detecting whether or not the paper is curled and the direction of the curl, and a curl removing means located behind the detecting means and controlled by a detection signal from the detecting means. , a method has been proposed that automatically corrects the curl according to the direction of the curl (see Japanese Patent Laid-Open No. 48343/1983). With this configuration, curl detection is performed, but
However, since the straightening mechanism is a roller type and has a structure that can deal with curls in both directions, the apparatus has the disadvantage of being large-scale and high in cost.

(Purpose) The present invention improves the drawbacks of the conventional examples described above, and detects the roll diameter or amount of curling of roll paper, film, etc. and starts correction at the point when correction is required, or corrects the amount of curling. To provide a compact, low-cost curl correction device that controls correction according to the curl.

(Structure) In order to achieve the above object, the present invention includes a remaining amount detection means for detecting the remaining amount of roll paper, a correction roller for correcting the curl of the roll paper,
a first elastic member that can press against and separate from the correction roller; a second elastic member that guides the roll paper to be wound around the correction roller; 1, a means for bringing an elastic member into pressure contact with the correction roller, further comprising a means for controlling rotation and stopping of the correction roller, and a means provided near the correction roller to control the leading edge and the rear of the recording paper. A means for detecting the edge and a means for detecting the feeding amount of the recording paper are provided, and when the leading edge of the recording paper comes close to the correction roller when the curling correction is performed, the correction roller starts rotating. , the rotation is stopped when the trailing edge of the recording paper leaves.

(Example) Hereinafter, an example will be described in detail based on the drawings.
FIG. 1 shows a paper conveyance path on the receiving and recording side of a facsimile machine. Reference numeral 1 denotes a roll paper as a recording paper, and the roll paper pulled out from a storage section is recorded in a recording section between a thermal head 2 and a feed roller 3, and then cut into a predetermined size by a cutter section 4. The cut paper continues to the left,
Enter the curl correction department. The curl correction unit includes a correction roller 5, a leaf spring 6 (first elastic member) that can be pressed against and separated from the roller, and a guide leaf spring 7 (second
(elastic member). The recording paper passes through this curl correction section and advances upward until it reaches the discharge roller 8.
is discharged onto the stacker 9. In addition, 10
1 is a paper discharge motor, and 11 is a recording paper conveyance motor.

The correction roller 5 in the curl correction section is made of a rubber roller, and the curl of the rolled paper is corrected by pushing a leaf spring 6 against it and feeding the paper while squeezing it. The guide leaf spring 7 is provided with some clearance from the roller 5 and is structured to guide the recording paper so as to wrap it around the roller 5. If the contact pressure of the leaf spring 6 is weak, the curling correction will not be sufficient, and if it is too strong, the load torque applied to the correction roller 5 will increase or the roller will bend.

Conventionally, in the drive system of each roller on the recording side, as shown in FIG. It was configured to be driven by a motor 10 via a pulley and a belt. By the way, in general, there is a relationship of conveyance torque>curling correction torque>>sheet discharge torque, so in this embodiment, as shown in FIG. Instead of being driven by the conveyor motor 11 having a high torque.

Normally, during conveyance, when the gear 3a fixed to the feed roller shaft rotates forward (in the direction of the solid arrow, counterclockwise),
The first transmission gear 12 rotates to the right, and the first intermediate gear 13 rotates to the left. As a result, the correction roller 5 rotates clockwise to convey the recording paper while correcting the curl. At this time, the second transmission gear 14 rotates to the left, but since the second intermediate gear 15 has a one-way clutch, no driving force is transmitted. If the recording paper is cut after receiving the final page, the leading edge of the next recording paper must be returned to the recording section. On the other hand, the cut recording paper remains in the curl correction section, so the conveyance motor 11 is reversed to return the recording paper, but at this time the gear 3a of the feed roller is reversed (in the direction of the dotted arrow, clockwise) )
However, the first transmission gear 12 rotates to the left. moreover,
Since the second transmission gear 14 rotates to the right and the second intermediate gear 15 rotates to the left, the straightening roller 5 rotates to the right, thus conveying the recording paper while correcting curls as in normal rotation. At that time, the first intermediate gear 1
3 has a one-way clutch, so no driving force is transmitted. Note that during normal conveyance (forward rotation), the feed roller requires a pulling force from the roll paper, but when pulling back after cutting (reverse rotation) it is not necessary, so the conveyance speed of the correction roller drive system during reverse rotation is can be increased accordingly.

Conventionally, the leaf spring 6 of the curl correction section was always in contact with the correction roller 5, and correction was performed in the same state whether the roll paper diameter was large or small. Therefore, if the diameter is large, curling may occur, and as shown in FIG. 4, a torque of A is required as the motor torque. However, in reality, curl correction is required only after the roll diameter becomes small to a certain extent. Further, the overall conveying torque decreases by the amount of decrease in the roll paper pull-out torque, which decreases correspondingly as the roll diameter decreases. The present invention makes effective use of this point, and if straightening is started after the roll diameter has decreased to a certain extent, the torque B shown in FIG. 4 will be sufficient. At this time, a motor with extremely low torque is sufficient as the paper ejection motor.

Next, a means for detecting the timing to start correcting curling curls will be explained using FIGS. 5 to 7. First, Fig. 5 shows a method for detecting the timing to start straightening based on changes in the outer diameter of the roll paper.
As the diameter of the roll paper 1 gradually decreases, the lever 22 having a roller 21 at its tip rotates around the fulcrum _q1 , and its position moves from _p1 to _p2 to _p3 .
At that time, the light is detected by a photo sensor 23 consisting of a light-emitting and light-receiving element that has been installed in advance at an appropriate position. The detection in this case can also serve as the remaining amount detection (near end) of the roll paper.
As another detection method, for example, a black mark or the like may be printed at an appropriate position on the recording back side of the roll paper and then detected.

In FIG. 6, the amount of curling is detected just before the straightening roller 5 and the start of straightening is determined. The lever 24 for detection is rotatable around the fulcrum _q2 , and the spring 2
5 and is pressed against the guide 26. Recording paper 1
When the curl is small as in a, the force to press the lever 24 is weak, and when the curl is large as in the case of the recording paper 1b, the lever 24 is pushed and rotated by the waist of the recording paper, and the lever 24 touches the photo sensor 27. or once detected.

FIG. 7 shows a method for detecting curling curls in the stacker 9.
The detection lever 24, which is rotatable about _q3 , is basically the same as the case shown in FIG. 6, except that it is lowered by its own weight. Note that 29 is a stopper.

In general, the winding pattern varies depending on not only the roll diameter but also the temperature and humidity and the recorded pattern (for example, black, regular characters, triangles, diagonal lines, white, etc.). From this, the configuration shown in Fig. 6 is excellent because it can detect and correct each sheet of recording paper, but in reality, even within a single sheet of recording paper, the recording pattern varies depending on the location, and curls may occur. also corresponds to this, so this point needs to be taken into account. Further, in the configuration shown in FIG. 7, since the recording paper discharged to the stacker is detected, correction is performed starting from the next recording paper, and there is a disadvantage that the operating point changes depending on the number of stacked sheets.

If it is determined through the above detection that curling correction is necessary, the correction is started, and FIGS. 8 and 9 each show an embodiment of the curling curl correction means. In both cases, figure a shows the normal state, and figure b shows the state of curl correction.

First, in the one shown in FIG. 8, the solenoid 31 is sucked to bring the leaf spring 6 into contact with the correction roller 5 to start correction of curling. Here, the clearance between the roller 5 and the leaf spring 6 in FIG. Any distance may be used as long as it is longer than the distance to the roller 8.
In addition, in the normal conveyance state, as shown in FIG. 8a, the leaf spring 6 is brought into light contact with the roller 5 to perform weak correction, and the contact pressure is increased by suctioning the solenoid 31 to perform strong correction. You may also do so.

The one in Fig. 9 has a flat spring 6 (second
When the elastic member (elastic member) is in light contact with the straightening roller 5 and a signal that requires strong straightening is received, the solenoid 31 is activated and the guide leaf spring 7
(first elastic member) is brought into pressure contact with the correction roller 5. Therefore, with this configuration, curl correction is performed twice.

Note that the signal is generated in two stages, the first signal brings the leaf spring 6 into contact, and the next signal brings the guide leaf spring 7 into contact.
By bringing them into contact with each other, it is possible to perform finer curl correction and to further equalize the load torque applied to the motor in FIG. 4.

Fig. 10 shows another embodiment of the curl correction means. This system attempts to reduce the required driving torque by rotating the rollers only when there is recording paper in the unit. After the leading edge of the recording paper 1 is detected by the photo sensor 32, when it is fed by a predetermined amount, the leading edge enters between the correction roller 5 and the leaf spring 6.
If the recording paper is fed to the extent that it has a bulge as shown by the dashed dotted line 1c, the paper will penetrate better and less likely to cause poor feeding accuracy due to tension between the paper curl correction section and the feeding roller section. If the correction roller 5 is rotated with the paper inserted, the paper can be transported while being corrected with a small torque. After the end of the recording paper is detected by the photo sensor 32, the rotation of the roller 5 is stopped when the recording paper has been fed a predetermined amount (until the end passes the contact portion between the correction roller and the leaf spring). The rotation of the correction roller 5 may be controlled by an electromagnetic clutch or the like, and the feed amount may be determined by counting the number of steps of a stepper motor. In this case, it can be easily driven using the driving method shown in FIG.

(Effects) As explained above, according to the present invention, since the roll diameter or the amount of curling curl is detected and the curling curl correction is performed from the point at which it is necessary, proper correction results with no excess or deficiency can be obtained. is obtained. Furthermore, since the straightening section is activated from the time when the load on the feed roller is reduced, the load torque on the motor is made uniform, and the drive section can be made smaller and less expensive, and noise and heat generation can be reduced.

Furthermore, since the roll diameter detection can also serve as the roll paper remaining amount detection (near end), the number of detection units can be reduced, resulting in cost reduction. Also,
In a configuration in which the straightening roller starts rotating when the leading edge of the recording paper comes near it and stops rotating when the trailing edge moves away, the load on the straightening roller is reduced, making it possible to use small, small-capacity A motor can be used, and the drive unit can be made smaller and less expensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a receiving and recording section of a facsimile device to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing a conventional recording side drive system in a facsimile device, and FIG. 3 is a diagram showing the present embodiment. FIG. 4 is a diagram showing the required torque of the drive motor with respect to the roll diameter, FIG. 5 is a configuration diagram of an embodiment of the roll diameter detection means, and FIGS. 6 and 7 are diagrams showing the recording side drive system. 8 and 9 are block diagrams of an embodiment of the curl correction means, respectively, and FIG. 10 is another embodiment of the curl correction means. FIG. 1... Roll paper, 2... Thermal head, 3...
...Feed roller, 5... Correction roller, 6... Leaf spring, 7... Guide leaf spring, 8... Paper ejection roller, 9
... Stacker, 10 ... Paper ejection motor, 11 ...
Conveyance motor, 22, 24... Lever, 23, 2
7, 32...Photo sensor, 31...Solenoid.

Claims (1)

[Claims] 1. Remaining amount detection means for detecting the remaining amount of roll paper;
a correction roller for correcting the curl of the roll paper; a first elastic member that can be pressed against and separated from the correction roller; and a second elastic member that guides the roll paper to be wound around the correction roller. parts and
A curl correction device comprising means for pressing the first elastic member against the correction roller in response to a detection signal from the remaining amount detection means. 2 remaining amount detection means for detecting the remaining amount of roll paper;
a correction roller for correcting the curl of the roll paper; a first elastic member that can be pressed against and separated from the correction roller; and a second elastic member that guides the roll paper to be wound around the correction roller. parts and
means for bringing the first elastic member into pressure contact with the correction roller in response to a detection signal from the remaining amount detection means; a means for controlling rotation and stop of the correction roller; and a means provided near the correction roller. It consists of a means for detecting the leading edge and trailing edge of the recording paper, and a means for detecting the feed amount of the recording paper, and when the leading edge of the recording paper comes close to the correction roller when performing curl correction, the correction is performed. A curl correction device characterized in that the roller starts rotating and stops rotating when the trailing edge of the recording paper is separated.