JPH0881124A - Stacker control device - Google Patents

Abstract

PURPOSE: To improve stacking property by composing a folding tool for pressing the crease of a paper and its adjacent portion onto a stacking table so as to move it from a reference position to a designated corrected position on the center side of the stacking table when a stack sensor detects any faulty stack. CONSTITUTION: A printing device such as a continuous paper printing has a stacker for winding and stacking a printed continuous paper P and the stacker comprises a stacker table 1 and a pair of impellers 3a serving as a folding tool turning above its both ends part for pressing a crease of the paper P and its adjacent part in the stacker table 1. A fault detecting signal is outputted by a stack sensor 80 when a paper detecting signal in front and rear of crease of the paper P is not detected. Then, a movement control means actuates a motor for moving through a driver and moves the impellers 3a from a reference position to a center side of the stacker table 1 by a distance set from the reference position so as to hold the paper P securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacker control device used in a printing device such as a continuous paper printer, and more particularly to a stacker control device for improving stacking of sheets on a stacker table, that is, stacking property. It is a thing.

[0002]

2. Description of the Related Art A printing apparatus such as a continuous paper printer is provided with a stacker for folding and stacking printed continuous paper at creases, and this stacker has a stacker table for receiving paper and a stacker table for receiving the paper. In order to improve the stackability of the sheets, a folding tool that rotates above the stacker table and presses the folds of the sheets and the vicinity thereof to the stacker table may be provided.

As the folding tool, a pair of ladder chains 102 and 103 arranged above the stacker table 101 as shown in FIG. 12 and a stacker table 201 as shown in FIG. There is a pair of impellers 203 and 204.

In the stacker provided with the ladder chains 102 and 103, the paper P has two ladder chains 10.
The sheet P is fed into the stacker table 101 from between 2.103 and the leading edge of the paper P is
After hitting the upper surface of the stacker table 101, the stacker table 101 slides to a predetermined position toward one end and is received at the predetermined position.

From the leading edge of the sheet P to the first fold (one page), as the sheet P is fed, the portion in contact with the upper surface of the stacker table 101 gradually expands from the leading edge. Is curved so as to swell toward the side opposite to the leading end, and the sheet P contacts the ladder chain 103 on the side opposite to the leading end of the sheet P.

The ladder chain 103 presses the contacted paper P to the side opposite to the front end of the paper, and feeds the first fold of the paper P toward the end of the stacker table 101 opposite to the front end of the paper.

By forming perforations at the folds of the sheet P, the waist is easily bent at the folds. Therefore, when the ladder chain 103 presses the first fold and the vicinity of the sheet P fed toward the end of the stacker table 101 opposite to the leading edge of the sheet, the sheet P folds at the fold and the stacker table 101 The portion of the paper P (page 2) following the first fold starts to be folded on the first page stacked on the paper, and at the same time, the paper P starts to separate from the ladder chain 103.

When the paper P is further fed, two pages are sequentially overlapped with respect to the first page from the first fold side, and when the paper P is fed to some extent, the second page is curved so as to bulge toward the leading end side of the paper P, Comes in contact with the ladder chain 102 on the tip side of the.

The ladder chain 102 draws the contacted paper P to the front end side of the paper, the next fold of the paper P is fed to the end of the stacker table 101 on the front end side of the paper, and the paper P is positioned on the front end of the stacker table 101. The sheet is folded at the next fold fed into the stacker, and the portion of the next sheet of paper P (page 3) starts to be folded over on page 2 on the stacker table 101.

In order to detect the upper surface of the paper P folded on the stacker table 101 in this way, a paper height sensor 40 is provided, and the paper height sensor 40 is provided.
When the upper surface of the paper P is detected by the stacker table 10
1 is moved downward so that the distance between the upper surface of the sheet on the stacker table 101 and the ladder chains 102 and 103 is kept within a predetermined range.

When the impellers 203 and 204 are used,
In order to guide the paper P to the positions of the impellers 203 and 204, a swing guide 202 that swings at a predetermined cycle above the stacker table 201 is provided.

The swing guide 202 is first moved to a position where the leading edge of the sheet P is fed to the lower side of the impeller 203 at one end of the stacker table 201, and the leading edge of the sheet P is at one end of the stacker table 201. Send to.

At one end of the stacker table 201, the leading edge of the paper P contacts one impeller 203, and the impeller 203
Stacker table 201 so that it can be stroked by
Hold down.

When the leading edge of the sheet is received at one end of the stacker table 201 at a predetermined position, the swing guide 202 starts to swing toward the opposite side of the stacker table 201 and comes into contact with the stacker table 201 of the sheet P. The part spreads from the tip in order.

When the first fold line of the sheet P is fed into the impeller 204 on the side of the stacker table 201 opposite to the leading edge of the sheet, the rotating impeller 204 presses the sheet P onto the stacker table 201, which facilitates folding. The waist of the paper P is folded at the fold, and two pages start to be stacked on one page.

The swing guide 202 starts to swing in the direction opposite to that of the first page in synchronism with the folding of the sheet P, and the second page sequentially folds into the first page stacked on the stacker table 201. Overlap from the side. Next, the impeller 20 of the stacker table 201 on the leading edge side of the sheet
When the next fold line is fed to 3, the rotating impeller 203 presses the sheet P onto the stacker table 201, and page 3 starts to be stacked on page 2.

In this way, the upper surface of the paper P folded over the stacker table 201 is detected by the paper height sensor 40, and the stacker table 201 is moved every time the upper surface of the paper reaches the height of the paper height sensor 40. It is moved downward so that the distance between the upper surface of the sheet on the stacker table 201 and the impellers 203 and 204 is kept within a predetermined range.

When a plurality of sheets P having different sheet sizes are used, as shown in FIG. 14, a sheet guide 30 for aligning one end of the sheets P on the stacker table 301.
2 is provided and is configured to move the paper guide 302 according to the paper size.

[0019]

By the way, if environmental conditions such as the type of the paper P, the print mode (especially when the print density is not uniform), the humidity, etc., or the paper P has vertical wrinkles, for example, In the case of the stacker including the impellers 203 and 204, as shown in FIG.
Stacking failure in which the paper P is not pressed by the impeller 203 at all, and the pressing effect of the impeller 203 decreases as shown in FIG. 16, and the paper P swells outward. Etc. may occur. This kind of stacking failure also occurs in the stacker including the ladder chains 102 and 103. In the stacker device without the following stack sensor, conventionally, when the above-mentioned stacking failure occurs, printing is continuously performed as it is until the end of printing, the paper P is sent to the stacker, and the stacker tables 101, 201, 30
Paper P is stacked on top of 1.

However, if the sheets P are continuously stacked while such a stack defect occurs, not only the stacking state of the sheets P (stacking property) deteriorates, but also
Around the paper P, dirt may be attached, jamming of the paper P may be caused by jamming of the paper P, and jamming may occur in the printer or stacker. The paper may be torn.

On the other hand, as shown in FIG. 15 and FIG. 16, in order to detect the stacking state of the sheets P sequentially stacked on the stacker table 1, a stack sensor 303 including a light emitting element and a light receiving element is provided, and this stack is provided. There is also developed a stack control device having a function of monitoring a state where the paper P blocks the optical path of the state detection sensor 303 and determining whether or not the stack state is normal. However, in this type of stack control device, when a stack defect is detected, printing is stopped, and the stack defect is manually eliminated.

The present invention has been proposed based on the above conventional circumstances, and an object thereof is to provide a stacker control device for recovering a defective state without stopping printing when a defective stack occurs. To do.

[0023]

To achieve the above object, the present invention employs the following means. That is, FIG.
As shown in FIG. 3, the stacker table 1 that is lifted and lowered by the lift drive device 2 and the folding tool 3 that is rotated above the stacker table 1 by the rotation drive device 4 and presses the fold line of the paper P and its vicinity to the stacker table 1. In the provided stacker control device, the stack sensor 80 for detecting the stacking state of the sheets and the folding tool 3 configured to be displaceable in the sheet length direction by the movement drive device 7.
And a movement control means 91 for controlling the movement drive device 7 so as to move the folding tool 3 from the standard position to a predetermined correction position on the center side of the stacker table 1 when the stack sensor 80 detects a stack defect. Prepared for configuration.

The movement control means 91 moves the folding tool 3 from the standard position to a predetermined correction position on the center side of the stacker table 1 and then returns the folding tool 3 to the standard position when the stack defect is eliminated. Move drive device 7
Is controlled.

The folding tool 3 is mounted on a paper guide provided on the stacker table 1 so as to be displaceable in the paper length direction according to the paper size, so as to be displaceable in the paper length direction on the stacker table 1. , The movement control means 91,
The folding tool 3 is provided so as to move in the paper length direction on the stacker table 1 with respect to the paper guide.

Further, the present invention provides a stack sensor 80.
When the stack failure is detected, the rotation control means 92 for controlling the rotation drive device 4 is provided so as to increase the rotation speed of the folding tool 3 above the standard rotation speed.

The rotation control means 92 stops the increase of the rotation speed of the folding tool 3 when the stack sensor 80 detects the elimination of the stack defect while the rotation of the folding tool 3 is increased more than the standard rotation speed. To do so.

Further, the rotation control means 92 starts to increase the number of rotations of the folding tool 3 from the reference number of rotations, and then, at a predetermined time after the stack sensor 80 detects the elimination of the stack defect, the rotation control means 92 is folded. It is also possible to return the rotation speed of the tool 3 to the standard rotation speed.

Further, according to the present invention, the stack sensor 8 is provided.
Stacker table 1 when 0 detects a stack defect
It is also possible to realize by providing a configuration including an elevating / lowering control means 93 for controlling the elevating / lowering drive device 2 so as to raise it to a predetermined height after it is once lowered.

Further, according to the present invention, the paper length setting means 20 for setting the paper length or the paper length detecting means 10 for detecting the paper length, and the set value of the paper length setting means 20 or the detection of the paper length detecting means 10 This can also be realized by providing the rotation control means 96 for controlling the rotation drive device 4 so as to increase or decrease the standard rotation speed of the folding tool 3 based on the value.

The sheet length detecting means may use the position stack sensor 80 for detecting the position of the sheet guide, or the stack cycle detecting means 30 for detecting the paper length based on the length of the stack cycle. .

[0032]

[Operation] The first stacker control device of the present invention is a paper P
When a stack defect that does not reach the folding tool 3 occurs, the movement control unit 91 that detects this stack failure controls the movement driving device 7 to move the folding tool 3 from the standard position to the predetermined position on the center side of the stacker table 1. To the correction position and contact the paper P. As a result, the paper P comes into contact with the folding tool 3 and is pressed down, and the stack defect is eliminated.

In the above-mentioned stacker control device, as long as this kind of stacking failure occurs continuously, the folding tool 3 is held at a predetermined correction position on the center side of the stacker table 1 to prevent the stacking failure from occurring successively. Is preferred,
If the folding tool 3 is left at the correction position even after the stack defect is eliminated, the P-paper and the folding tool 3 may be damaged, and in particular, the wear of the folding tool 3 may significantly progress. .

Therefore, in the above stacker control device, after the transfer control means 91 moves the folding tool 3 from the standard position to the predetermined correction position on the center side of the stacker table 1, the stack sensor 80 has a defective stack. It is preferable to control the movement driving device 7 so as to return the folding tool 3 to the standard position when the elimination is detected to minimize the damage given to the paper P and the folding tool 3.

In the above stacker control device,
When a paper guide for receiving the folds of the paper P on the stacker table 1 is provided so as to be displaceable in the paper length direction on the stacker table 1 according to the paper size, the position of the fold, that is, the position of the paper guide The relative position with respect to the folding tool 3 becomes a problem.

Therefore, in this case, the folding tool 3 is further mounted on the sheet guide so as to be displaceable in the length direction of the sheet on the stacker table 1, and the movement driving device 7 is used for the folding tool 3.
Must be provided so as to move in the paper length direction on the stacker table 1 with respect to the paper guide.

In the second stacker control device of the present invention, the rotation control means 9 is used when a stack defect occurs in which the sheets P swell outward due to insufficient pressing force of the folding tool 3.
The rotation driving device 4 is operated by 2 to increase the number of rotations of the folding tool 3. As a result, the pressing force applied to the paper P by the folding tool 3 at the time of one folding increases, so that the paper P is pressed and the stack defect is eliminated.

Also in the second stacker control device,
In order to minimize the damage given to the paper P and the folding tool 3, after the rotation control means 92 starts to increase the rotation speed of the folding tool 3 from the standard rotation speed, the stack sensor 80 eliminates the stack defect. It is preferable to control the rotation drive device 4 so as to stop the increase in the number of rotations of the folding tool 3 when is detected. Further, it is preferable to control the rotation driving device 4 so as to return the rotation speed of the folding tool 3 to the standard rotation speed after stopping the increase of the rotation speed of the folding tool 3 as described above.

In the third stacker control device of the present invention, when a stack defect occurs in which the paper P swells outside the folded position, the elevating control device 93 operates the elevating drive device 2 to move the stacker table. By lowering 1, the bulge of the paper P is reduced.

As described above, the elevating / lowering control means 93 raises the lowered stacker table 1 to the original height or a position lower than the original height, whereby the stack defective state is recovered.

In the third stacker control device, how to set the trigger to raise the once lowered stacker table 1 is free, and for example, the rise start time of the lowered stacker table 1 is set by a timer. It can also be controlled.

According to the fourth stacker control device of the present invention, the rotation control means 96 determines the standard rotation speed of the folding tool 3 based on the set value of the paper size setting means 20 or the detection value of the paper size detecting means 10. The length of the long paper P is small and the length of the short paper P is large, so that the folding tool 3 keeps the opportunity to contact the stacked paper P at a certain level or more while the folds are folded back.

As a result, the pressing force of the folding tool 3 is insufficient and the sheets P bulge outward, causing a stack defect, or conversely, the folding tool 3 is worn or damaged due to excessive rotation of the folding tool 3. Can be minimized.

The above paper size can also be determined by detecting the stack cycle. However, when the rotation speed of the folding tool 3 is controlled based on the stack cycle, it is possible to cope with a change in the stack cycle that is not based on the paper size.

Any of the above-mentioned position control of the folding tool 3, rotation speed control of the folding tool 3 based on stacking failure, elevation control of the stacker table 1, and rotation speed control of the folding tool 3 based on the sheet size (stack period). By combining two or more kinds of control, it becomes possible to achieve the object of the present invention more effectively.

[0046]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in the configuration diagram of FIG. 2, a stacker device to which an embodiment of the present invention is applied is a stacker table 1 that can be moved up and down, and a stacker as a lift drive device 2 that drives the stacker table 1 up and down. The motor 2a, a pair of impellers 3a as a folding tool 3 that rotates above both ends of the stacker table 1 and presses the fold line of the sheet P and its vicinity to the stacker table 1, and each impeller 3a are rotated. The rotary drive device 4 includes an impeller motor 4a, a swing guide 5 that alternately guides the paper P to the rotation region of each impeller 3a, and a wiper motor that swings the swing guide 5.

Further, in this stacker device, each impeller 3a is
Are supported on the guide rails 6 via the corresponding impeller motors 4a so as to be able to advance and retreat in the length direction (left and right direction in the drawing) of the sheets P stacked on the stacker table 1, and the movement as the movement drive device 7 is performed. It is configured to be reciprocally driven by the motor 7a.

Although the paper guide is not shown in FIG. 2, the paper guide 302 similar to the conventional paper guide 302 shown in FIG. 14 can be used as the paper guide. Further, in the present invention, the configuration shown in FIG. 3 in which the paper guide and the impeller are combined can be used.

In FIG. 3, the sheet guide 61 is supported by a guide rail 63 via a slide 62 so as to be movable in the length direction of the sheets P stacked on the stacker table 1. Further, the frame body 65 is supported by the sub-rail 64 supported by the slide 62 so as to be movable in the length direction of the sheets P stacked on the stacker table 1 with respect to the sub-rail 64.

The paper guide 61 and the frame body 65 are configured to be manually positioned selectively at one of a plurality of positions determined according to the length of the paper P to be used. .

The frame body 65 rotatably supports the impeller 3a, and also supports an impeller motor 4a for rotating the impeller 3a and a moving motor 7a. or,
A pair of front and rear rollers 66 rolling in the sub-rail 64 are rotatably supported on the frame body 65, and the impeller 3a is moved relative to the paper guide 61 by driving the rollers 66 by the moving motor 7a. The sheets P stacked on the stacker table 1 are moved in the length direction.

A stacker control device according to an embodiment of the present invention applied to this stacker includes a stack sensor 80 shown in FIGS. 4 and 8 and a stack detection means 8 for outputting a detection signal from the output of the stack sensor 80. It is equipped.

As shown in FIG. 4, the stack sensor 80 comprises a light emitting element 80a and a light receiving element 80b for detecting the stacking state of the sheets P on the stacker table 1,
The light emitting element 80a and the light receiving element 80b are slightly higher than the height of the upper surface of the paper, and are arranged so that the optical path is slightly inclined from the paper width direction, and on both sides of the stacker table 1 closer to the center than the impeller 3a. Two pairs are arranged in the position.

A stack detecting means 8 including a waveform shaping circuit 81 and a detecting circuit 82 is provided at the subsequent stage of the stack sensor 80. By the way, when the paper P guided by the swing guide 5 comes into contact with the impeller 3a, it is pressed onto the stacker table 1 by the impeller 3a and folded at the fold.

Therefore, when the sheet P is pressed onto the stacker table 1 by the impeller 3a, the light emitting element 8
The optical path from 0a to the light receiving element 80b is interrupted, and the waveform shaping circuit 81 provided at the subsequent stage of each light receiving element 80b has an optical path before and after the fold of the paper P at a constant cycle as shown in the timing chart of FIG. A paper detection signal S that changes in a pulse shape each time the paper is cut off is output.

The light emitting element 80 of the stack sensor 80
The sheet P descending by arranging a and the light receiving element 80b so as to be slightly oblique to the sheet width direction as described above.
Interrupts the optical path for a certain time or longer, and the difference between the noise of the output of the stack sensor 80 and the sheet detection signal S indicating the optical path interruption by the sheet P becomes remarkable.

When a stack failure occurs in which the paper P does not come into contact with the impeller 3a as shown in FIG. 15, the paper detection signal S before and after the fold of the paper P as shown in the waveform diagram of FIG.
When the stacking defect occurs in which the sheet P is swelled and the sheet P is swollen due to insufficient pressing force of the impeller 3a as shown in FIG. 16, the sheet detection signal S after the fold of the sheet P is generated as shown in FIG. Lack.

In the subsequent stage of the waveform shaping circuit 81, there is a stack defect in which the paper P does not come into contact with the impeller 3a, or the paper P
A state detection circuit 82 shown in FIG. 8 for detecting whether or not the stack is defective is provided.

That is, as shown in FIG. 9, two pulses P1 and P2 (P3, P3, P3, P3 (P3, P3) output from the waveform shaping circuit 81 (stack sensor 80) corresponding to the page to be folded back and the page after it are folded.
At the rising edge of the first pulse P1 of P4), the output of the flip-flop 82a is set to "1" and the counter 82b is enabled. Next, at the rising edge of the pulse P2, the output of the counter 82b is read by the time monitor 82c to detect whether or not the time T1 is within a predetermined range, and the counter 82b is reset. As a result, when the time monitor 82c detects that the time T1 is not within the predetermined range (when the stacking defect in which the pressing force of the impeller 3a is insufficient and the paper P is swollen) occurs, the first A defect detection signal is output.

Similarly, the pulses P corresponding to both ends of the paper P are
2 and P3, the output of the flip-flop 82d is set to "1" at the rising edge of the pulse P2, and the counter 82e is enabled. Next, at the rise of the pulse P3, the output of the counter 82e is read by the time monitor 82f to detect whether or not the time T2 is within a predetermined range, and the counter 82b is reset. As a result, when it is detected that the time T2 is not within the predetermined range (when it is detected that the stack failure occurs in which the paper P does not contact the impeller 3a), the time monitor 82.
f outputs the second defect detection signal.

As is apparent from FIG. 4, since the stack sensors 80 are provided corresponding to the left and right sides of the sheet in this embodiment, the waveform detection circuit 81 and the state detection circuit 82 are also provided in the respective stack sensors 80. Two sets are provided correspondingly, which makes it possible to detect the stack state more accurately.

At the subsequent stage of the stack detecting means 8, there is provided control means 9 which operates based on the first and second defect detection signals output from the stack detecting means 8. The control means 9 includes a movement control means 91 and a rotation control means 9 which will be described later.
2. In addition to the elevation control means 93, a swing control means 94 for controlling the swing cycle of the swing guide 5 conventionally provided in this type of stacker device, and a height control means 95 for controlling the height of the stacker table 1 are provided. Prepare

As shown in FIG. 2, in the stack control device of the present application, as in the conventional case, in addition to the stack sensor 80,
Paper height sensor 40 is provided for detecting the height of the sheet P, as shown in the block diagram of FIG. 10, the output of the paper height sensor 40 is input to the height control unit 95.

The height control means 95 outputs a table lowering command when the sheets P are piled up to the height of the sheet height sensor 40 after the stacking of the sheets P is started, and the driver 73 outputs the stacker table 1. The stack motor 2a is driven so as to move down over a predetermined distance.

Further, the swing control means 94 operates the wiper motor so that the swing of the swing guide is repeated according to the size of the paper P output by the paper size setting means 30, and swings the swing guide 5. It only needs to be configured.

The control means 9 of the present invention will be described below with reference to FIGS. 10 and 11. The above-mentioned movement control means 91 and rotation control means 9 which are constituent requirements of the control means 9.
2. The elevation control means 93 may be provided independently of each other, or two or more of them may be combined.

As shown in FIG. 6, when the paper detection signals S before and after the fold of the paper P are both missing, the stack detection means 8
Then, the second defect detection signal (state “1”) is output and input to the movement control means 91. As a result, the movement control unit 91 causes the movement distance setting unit 51a to set a predetermined distance (for example, 10 to 10 mm) from the standard position (for example, the position where the impeller 3a presses about 5 mm from the fold of the paper P on the upper surface of the paper). 15 mm), the moving motor 7a is operated via the driver 71 to move it to the center side of the stacker table 1.

As a result, the impeller 3a comes into contact with the paper P, and the paper P is pressed against the stacker table 1 by the impeller 3a, and the stack defect is eliminated.
When the impeller 3a is rotated considerably inside the sheet edge as described above in the state where the stack defect is eliminated, the state where the impeller 3a largely contacts the upper surface of the sheet is continued, and the sheet P and the sheet P The impeller 3a is greatly damaged and disadvantageous.

Therefore, when the stack defect is resolved as described above, the stack detection means 8 sets the second defect detection signal to "0" indicating the defect recovery state, and upon receipt of the "0", the movement control means. 91 is a moving motor 7 via a driver 71.
By reversing "a", the stacker table 1 is returned to the standard position set by the standard position setting means 51b.

The moving distance setting means 51a may be distance setting means for setting an actual distance, or may be a timer for setting the operating time of the moving motor 7a. Further, as shown in FIG. 3, in the structure in which the paper guide 61 and the impeller 3a are integrated,
The impeller 3a is set at the origin position regardless of the paper size, but as shown in FIG.
In the structure in which 1 and the impeller 3a are not integrated, it is necessary to control the impeller 3a to move to the origin position according to the paper size.

Although only the case where the impeller 3a is used as the folding tool 3 has been described above, when the ladder chain is used as the folding tool 3, the spread width of the ladder chain opened in the shape of an eight is defined as above. It is configured to be controlled by the movement control means 91.

Next, when the sheet P expands and the first defect detection signal (state "1") in which the sheet detection signal S after the fold of the sheet P is missing is output from the stack detection means 8, the rotation control is performed. The means 92 instructs the driver 72 to rotate the impeller motor 4a faster than the standard speed based on the value set in the rotation speed setting means 52a. As a result, the pressure of the impeller 3a applied to the paper P is increased, and the defective stack state is eliminated. Such a high rotation speed improves the stackability, but on the other hand, the paper P
It is desirable to return the number of rotations of the impeller 3a to the standard value after the stack defect is eliminated because the damage to the blade is large. Therefore, when the stack detection circuit 8 detects that the stack defect is eliminated (when the first defect detection signal becomes "0"), the rotation control means 92 causes the driver 7 to operate.
2 is instructed so that the rotation speed of the impeller motor 4a is returned to the standard value set in the standard rotation speed setting means 52b.

In the above structure, when a ladder chain is used as the folding tool 3, the rotation speed of the ladder chain is controlled. Similarly to the above, when the paper detection signal S after the fold of the paper P is lacking, the stack detection means 8 inputs the first defect detection signal to the lift control means 93. As a result, the lift control means 93 causes the driver 7
A descending command is output to 3, and the stacker table 1 is lowered based on the set value of the descending distance setting means 53a. As a result, the bulge of the paper P is reduced, the paper P is folded at the fold line, and the stack defect is eliminated.

Then, the elevating / lowering control means 93 descends the stacker table 1 by a predetermined distance as described above, and then the driver 7
3, a rise command is issued to raise the stacker motor 2a based on the set value of the rise distance setting means 53b. The ascending distance at this time may be the same as the descending distance or may be a shorter value.

In the above, it is ideal to detect whether the defective stack state has been recovered while the stack table 1 is fully lowered, but it is actually very time-consuming to detect the recovery of the defective stack state. Therefore, the stack state is detected after the above descending and ascending. The actual distance may be set in each of the distance setting means 53a and 53b, or the time may be set.

When the rotation speed of the impeller 3a is constant regardless of the paper size, it is necessary to adjust the rotation speed to the smaller paper size in order to reduce stacking errors. However. In this case, the rotation speed becomes too high for the paper P having a large paper size, and the impeller 3a and the paper damage increase.

Therefore, as described below, the impeller 3a
It is desirable to set the number of rotations of (1) to a value according to the paper size. That is, as shown in FIG. 11, the standard rotation speed of the corresponding paper size is read from the rotation speed setting means 54 based on the paper size detected by the paper size detection means 10, and the rotation control means 96 is based on this value. The driver 74 is instructed of the standard rotation speed of the impeller 3a.

As shown in FIG. 11, the paper size detecting means 10 includes a plurality of (here, three) paper length sensors 10a, 1 for detecting the position of the paper guide 302 (61).
0b ... In the above configuration,
The standard rotation speed of the impeller 3a is increased or decreased based on the output of each paper length sensor 10a, 10b ... However, a paper selection key 20 is provided instead of the paper length sensor 10a, 10b.
The standard rotation speed of the impeller 3a may be increased or decreased based on the output of the paper selection key 20.

Further, in FIG. 9, the output cycle of the pulse P1 (P2, P3, P4) output from the waveform shaping circuit 81 indicates the cycle (stack cycle) in which the sheets for two pages are stacked. A large cycle indicates a large paper length, and a small cycle indicates a small paper length. Therefore, the size of the sheet can be detected by detecting this stack cycle by some method.

That is, the stack period detecting means 30 is provided at the subsequent stage of the stack sensor 80 (waveform shaping circuit 81), and the rotation control means 96 determines the sheet length based on the stack period detected by the stack period detecting means 30. The configuration. The stack cycle detection means 30 can be configured by a PLL circuit that receives the output of the waveform shaping circuit 81 as an input. According to this configuration, even if the stack cycle changes due to factors other than the paper size, the rotation speed of the impeller 3a can follow the change in the stack cycle.

[0081]

As described above, in the first stacker control device of the present invention, the stacking tool is moved to the center side of the stacker table 1 when a stack defect in which the sheets do not contact the stacking tool is detected. Therefore, the folding tool can be brought into contact with the sheet, and the stack defect can be eliminated.

Further, in the second stacker control device of the present invention, when a stack defect in which sheets swell out occurs, the rotation speed of the folding tool is increased to increase the force with which the folding tool presses the sheets on the stacker table. Therefore, the stack defect can be eliminated.

Further, in the third stacker control device of the present invention, when a stack defect in which the paper swells occurs, the stacker table 1 is lowered to eliminate the swelling of the paper, and the blister-free paper is stacked by the folding tool. By pressing down on the table, stack defects can be eliminated.

Further, after eliminating the stack defect, the stacker table is raised to the height at the time of stack defect occurrence or a predetermined height lower than this, so that the distance between the folding tool and the upper surface of the paper is too wide, and the stacking occurs. It is possible to prevent defects.

In the fourth stacker control device of the present invention, the number of rotations of the folding tool is reduced for long sheets corresponding to the length of the sheet, and the contact between the folding tool and the sheet during one stack cycle is kept below a certain level. Since it is held in place, damage to the paper and the folding tool due to contact between the folding tool and the paper is minimized, wear of the folding tool is prevented for a long time, and stack failure is induced by the wear of the folding tool. Can be prevented for a long time,

[Brief description of drawings]

FIG. 1 is a principle view of the present invention.

FIG. 2 is a configuration diagram of the present invention.

FIG. 3 is a configuration diagram of another embodiment.

FIG. 4 is a plan view showing the arrangement of the detection device according to the embodiment.

FIG. 5 is a timing diagram of an example.

FIG. 6 is a stack sensor output waveform diagram when a stack is defective.

FIG. 7 is an output waveform diagram of the stack sensor 80 when another stack is defective.

FIG. 8 is a block diagram of stack detection means of the present invention.

9 is a time chart of FIG.

FIG. 10 is a block diagram of control means of the present invention.

FIG. 11 is a block diagram of control means of the present invention.

FIG. 12 is a configuration diagram of a conventional stacker.

FIG. 13 is another conventional stacker configuration diagram.

FIG. 14 is a configuration diagram of another conventional stacker.

FIG. 15 is a schematic view of a stack defect.

FIG. 16 is a schematic diagram of another type of stack failure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stacker table 2 Lifting drive device 3 Folding tool 4 Rotational drive device 7 Movement drive device 80 Stack sensor 91 Movement control means 92 Rotation control means 93 Elevation control means 96 Rotation control means

Claims (10)

[Claims] 1. A stacker control device comprising: a stacker table that is lifted and lowered by a lift drive device; and a folding tool that is rotated above the stacker table by a rotation drive device and presses a fold line of a sheet and its vicinity to the stacker table. A stack sensor that detects the stack state, the above-mentioned folding tool that can be displaced in the paper length direction by a movement drive device, and when the above-mentioned stack sensor detects a stacking failure, move the folding tool from the standard position to the center side of the stacker table. 2. A stacker control device, comprising a movement control means for controlling the movement drive device so as to move it to a predetermined correction position. 2. When the stack sensor detects elimination of a stack defect after the movement control means moves the folding tool from the standard position to a predetermined correction position on the center side of the stacker table, the folding tool is returned to the standard position. The stacker control device according to claim 1, wherein the stack drive control device controls the movement drive device so as to perform the control. 3. The movement control is provided such that the folding tool is displaceably mounted in the paper length direction on a paper guide provided on the stacker table so as to be displaceable in the paper length direction according to the paper size. 3. The stacker control device according to claim 1, wherein the means is provided so as to move the folding tool with respect to the paper guide in the paper length direction on the stacker table. 4. A stacker control device comprising: a stacker table that is lifted and lowered by a lift drive device; and a folding tool that is rotated above the stacker table by a rotation drive device and presses a fold line of paper and its vicinity to the stacker table. A stack sensor for detecting the stacking state of the sheets, and a rotation control means for controlling the rotation drive device so as to increase the rotation speed of the folding tool more than the standard rotation speed when the stack sensor detects a stack failure A stacker control device characterized by. 5. The rotation control means stops increasing the rotation speed of the folding tool when the stack sensor detects elimination of a stack failure while increasing the rotation of the folding tool above the standard rotation speed. 4. The stacker control device according to item 4. 6. A stacker control device comprising: a stacker table that is lifted and lowered by a lifting drive device; and a folding tool that is rotated above the stacker table by a rotation drive device and presses a fold line of paper and its vicinity to the stacker table. A stack sensor for detecting a stack state, and a lift control means for controlling the lift drive device so that the stacker table is once lowered when the stack sensor detects a stack defect and then raised to a predetermined height A stacker control device characterized by. 7. A stacker control device comprising: a stacker table that is lifted and lowered by a lift drive device; and a folding tool that is rotated above the stacker table by a rotation drive device and presses a fold line of paper and its vicinity to the stacker table. A paper length setting means for setting the paper length or a paper length detecting means for detecting the paper length, and a standard rotation number of the folding tool is increased or decreased based on the set value of the paper length setting means or the detection value of the paper length detecting means. A stacker control device comprising rotation control means for controlling the rotation drive device so as to control the stacker control device. 8. The stacker control device according to claim 7, wherein the paper length detection means is a position sensor that detects the position of the paper guide. 9. The stacker control device according to claim 7, wherein the paper length detection means is a stack cycle detection means for detecting the paper length based on the length of the stack cycle. 10. The rotation control means increases or decreases the number of revolutions of the folding tool from the standard number of revolutions in accordance with the length of the stack cycle, and then folds when the stack cycle reaches the standard cycle corresponding to the sheet length. The stacker control device according to claim 9, wherein the rotation drive device is controlled so as to stop the increase and decrease in the rotation speed of the tool.