JP2023086984A - Sheet feeding mechanism and sheet processing device including the same - Google Patents

Abstract

To provide a technology capable of suppressing the occurrence of idle feeding.SOLUTION: A sheet feeding mechanism 10 includes: a loading part 20 having a loading surface 20a where a sheet bundle S is loaded; an adsorption conveyance mechanism 24 for allowing an adsorption surface 50 to adsorb one piece of sheet of the top of the sheet bundle S on the loading surface 20a and feeding it; and an adjustment mechanism capable of adjusting the inclination of the adsorption surface 50 with respect to the loading surface 20a relatively, according to warping in the case where warping occurs in the sheet bundle S.SELECTED DRAWING: Figure 7

Description

The present invention relates to a sheet feeding mechanism and a sheet processing apparatus having the same.

A sheet processing device for stopping a sheet by abutting a stopper on the leading edge of the sheet being conveyed, bending the sheet to further convey the sheet in that state, and winding the sheet between two folding rollers to fold the sheet. It has been known.

If the sheet has a high rigidity, the sheet may not be flexed simply by further conveying the sheet that has hit the stopper and stopped, and therefore the sheet may not be caught between the two folding rollers. Patent Document 1 proposes a sheet processing apparatus that includes a creasing portion that creases a sheet before the sheet abuts against a stopper, and a folding knife that pushes the sheet between two folding rollers. there is According to this sheet processing apparatus, even a sheet having a relatively high rigidity can be folded.

WO2003/024853

As a result of studying the conventional sheet processing apparatus described in Patent Document 1, the inventors came to recognize the following problems.

FIGS. 1(a) and 1(b) are diagrams for explaining the problems of the prior art. 1A and 1B show a sheet feeding mechanism 210 of a sheet processing apparatus. The sheet feeding mechanism 210 includes a stacking unit 220 having a stacking surface 220a on which a sheet bundle is stacked, and an adsorption conveying mechanism 224 that adsorbs the uppermost sheet of the sheet bundle on the stacking surface 220a to an adsorption surface 250 and feeds it out. And prepare. The loading surface 220a and the adsorption surface 250 are substantially parallel. In FIGS. 1A and 1B, the sheet and the sheet bundle S are warped. In FIG. 1(a), the sheet and the sheet bundle S are curved downward, that is, the both end sides of the sheet are bent (curled) upward. In FIG. 1(b), the sheet and the sheet bundle S are warped upward, that is, both ends are positioned downward toward the ends. In any case, in FIGS. 1A and 1B, since the sheet is warped, the sheet and the adsorption surface 250 are not parallel. When the rigidity of the sheet is low, the warpage is corrected following the attraction surface 250 and the sheet is attracted to the attraction surface 250. However, when the rigidity of the sheet is high, the warp is not corrected and the sheet is not attracted to the attraction surface 250. - 特許庁. As a result, an idle feed occurs in which the sheet cannot be fed out.

Such a problem can occur not only in the sheet processing apparatus but also in other apparatuses having a sheet feeding mechanism.

The present invention has been made in such a situation, and one of the exemplary objects of certain aspects thereof is to provide a technique capable of suppressing the occurrence of non-feeding of sheets.

In order to solve the above-described problems, a sheet feeding mechanism according to one aspect of the present invention includes a stacking section having a stacking surface on which a sheet bundle is stacked, and an uppermost sheet of the sheet stack on the stacking surface. An adsorption conveying mechanism for adsorbing and feeding a sheet bundle, and an adjustment mechanism capable of relatively adjusting the inclination of the adsorption surface with respect to the stacking surface according to the warpage when the sheet bundle is warped.

Another aspect of the invention is a sheet processing apparatus. This apparatus includes the above-described sheet feeding mechanism and a creasing mechanism for making creases on the sheet fed from the sheet feeding mechanism.

Yet another aspect of the present invention is also a sheet processing apparatus. This device includes the above-described sheet feeding mechanism, and a folding knife that abuts on the sheet fed from the sheet feeding mechanism and causes the sheet to enter between the pair of folding rollers.

Arbitrary combinations of the above constituent elements, and mutual replacement of the constituent elements and expressions of the present invention between methods, devices, systems, etc. are also effective as embodiments of the present invention.

According to the present invention, it is possible to suppress the occurrence of idle feed.

FIGS. 1(a) and 1(b) are diagrams for explaining the problems of the prior art. 1 is a cross-sectional view of a sheet processing apparatus according to an embodiment; FIG. 3 is an enlarged sectional view showing an enlarged sheet feeding mechanism of FIG. 2; FIG. 3 is a view of the sheet feeding mechanism of FIG. 2 viewed from the upstream side in the conveying direction; FIG. FIG. 3 is a diagram of the sheet feeding mechanism of FIG. 2 viewed in the width direction from the right side; FIG. 3 is a perspective view of the air discharge mechanism of FIG. 2 as seen from the upstream side and the upper side; 6(a) to 6(c) are diagrams for explaining the adjustment of the inclination of the attracting surface by the adjustment mechanism of FIG. 3. FIG. FIG. 3 is an enlarged cross-sectional view showing an enlarged creasing portion, a folding portion, and a stacker portion in FIG. 2; FIG. 9 is an enlarged cross-sectional view showing an enlarged folding plate of the folding portion of FIG. 8 and its surroundings; It is a figure explaining adjustment of the inclination of the loading surface by the adjusting mechanism which concerns on a modification.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on preferred embodiments with reference to the drawings. The embodiments are illustrative rather than limiting the invention, and not all features and combinations thereof described in the embodiments are necessarily essential to the invention. The same or equivalent constituent elements, members, and processes shown in each drawing are denoted by the same reference numerals, and duplication of description will be omitted as appropriate.

(overall structure)
Please refer to FIG. The sheet processing device 1 is a device that performs predetermined processing such as creasing and folding on a sheet. A sheet to be processed by the sheet processing apparatus 1 may be warped depending on the processing in the preceding stage and the environment, and is typically paper. The sheet processing apparatus 1 is particularly suitable for use when the sheet has high rigidity, for example, when the sheet is thick paper. That is, the sheet feeding mechanism 2 can feed a thick sheet without causing an idle feed, so that the thick sheet can be creased or folded. Cardboard here may be 200 g/m ² paper.

Hereinafter, the direction in which the sheet is conveyed (the direction from left to right in FIG. 1) will be referred to as the conveying direction X, and the direction perpendicular to the conveying direction X (the direction perpendicular to the paper surface in FIG. 1) will be referred to as the width direction Y.

The sheet processing apparatus 1 includes a sheet feeding mechanism 10 for feeding sheets one by one, a creasing section 12 for making creases in the sheets fed one by one, a folding section 14 for folding the sheets along the creases, and a crease section 14 for folding the sheets along the creases. It includes a stacker section 16 that discharges attached or folded sheets, and a control section 18 that comprehensively controls the sheet processing apparatus 1 . The sheet feeding mechanism 10, the creasing section 12, the folding section 14, and the stacker section 16 are arranged in this order in the transport direction X from the upstream side (left side in FIG. 1).

(Sheet feeding mechanism)
See Figures 3-6. The sheet feeding mechanism 10 includes a stacking section 20 , a level sensor 22 , a suction conveying mechanism 24 , an adjusting mechanism 26 and a detection section 28 .

The stacking section 20 has a flat stacking surface 20a. A sheet bundle S is stacked on the stacking surface 20a. The stacker 20 is driven by a drive mechanism (not shown) to move up and down. The level sensor 22 detects when the uppermost sheet of the sheet bundle S on the stacking surface 20a is positioned above a predetermined height. The driving mechanism raises the stacking section 20 when the level sensor 22 no longer detects the sheet bundle S due to the decrease in the number of sheets in the sheet bundle S, and stops the lifting of the stacking section 20 when the level sensor 22 detects the sheet bundle S. As a result, the uppermost sheet of the sheet stack S is kept at a constant height.

The detection unit 28 detects when the upper surface of the sheet stack S pushes up the suction chamber 42 . When it is detected that the suction chamber 42 is pushed up by the sheet bundle S, the lifting of the stacking section 20 is stopped. As a result, it is possible to avoid a situation in which the stacking unit 20 continues to rise due to, for example, a failure of the level sensor 22 , thereby avoiding a situation in which the stacking unit 20 destroys the suction transport mechanism 24 .

The suction transport mechanism 24 includes a transport mechanism 30 , a suction mechanism 32 and an air ejection mechanism 34 .

The conveying mechanism 30 includes upstream rollers 36 , downstream rollers 38 , and a plurality of feeding belts 40 stretched between the upstream rollers 36 and the downstream rollers 38 . The plurality of feeding belts 40 are provided at predetermined intervals in the width direction Y. As shown in FIG. Downstream roller 38 is a drive roller. The downstream roller 38 is rotatably supported by the left and right fixed frames 8 (only the left fixed frame 8 is shown in FIG. 3). The downstream roller 38 is a drive roller and is connected to a drive motor (not shown) via a clutch and gears, for example. The upstream roller 36 is a driven roller. As the downstream roller 38 rotates, the feed belt 40 rotates.

The suction mechanism 32 sucks the uppermost sheet and causes the suction surface 50 of the transport mechanism 30 to absorb the sheet. The suction mechanism 32 includes a suction chamber 42 provided inside the plurality of feed belts 40 , a suction fan 44 and a valve mechanism 46 .

The suction chamber 42 has a plurality of suction ports 42a on the surface facing the loading surface 20a (that is, the lower surface). In particular, the plurality of suction ports 42a are located at positions avoiding the feeding belt 40, that is, at positions not blocked by the feeding belt 40, specifically between the feeding belts 40 and in the width direction Y. is provided on the outside of the feeding belt 40 in the .

A suction port (not shown) of the suction fan 44 communicates with the inside of the suction chamber 42 . When the suction fan 44 is operated, the suction fan 44 sucks the air inside the suction chamber 42, the pressure inside the suction chamber 42 becomes negative, and the air is sucked from the plurality of suction ports 42a. The suction fan 44 preferably has relatively high performance so that the sheet can be sucked even if the sheet is thick paper, that is, even if the sheet is ^relatively heavy. The maximum static pressure (standard value) may be 1950 Pa or more.

The suction chamber 42 has an air escape hole 42b (see FIG. 4). The valve mechanism 46 includes an opening/closing plate 48 and a solenoid 52 that vertically moves the opening/closing plate 48 to open and close the air escape hole 42b. When the opening/closing plate 48 is lowered to open the air escape hole 42b while the suction fan 44 is sucking air, the inside of the suction chamber 42 is no longer negative pressure, the suction from the suction port 42a is stopped, and the opening/closing plate When the air escape hole 42b is closed by raising the 48, the inside of the suction chamber 42 becomes negative pressure, and suction from the suction port 42a is started.

The air discharge mechanism 34 is provided downstream of the stacking section 20 . The air ejection mechanism 34 ejects air toward the front end of the sheet bundle S stacked on the stacking unit 20, and the uppermost sheet and the top two sheets of the sheet bundle S stacked on the stacking unit 20 are ejected. Improves the separability from the sheet below the eye. The air discharge mechanism 34 includes a discharge air chamber 54 and a blower fan (not shown). The blower port of the blower fan and the inside of the discharged air chamber 54 communicate with each other.

A box-shaped discharge chamber 112 in which a first air discharge port 114 and a second air discharge port 116 are formed is provided in the upper center of the discharge air chamber 54 . A second air outlet 116 is formed below the first air outlet 114 . Air is discharged obliquely upward from the first air discharge port 114 , and air is discharged obliquely downward from the second air discharge port 6 . By sliding the shield plate 118 in the width direction Y, the second air discharge port 116 can be opened and closed. Discharge chambers 120 each having a third air discharge port 122 are provided on both sides in the width direction Y of the discharge chamber 112 in the upper portion of the discharge air chamber 54 . Air is discharged horizontally from the third air discharge port 122 .

If the width of the sheet in the width direction Y is wider than the width of the suction transport mechanism 24, both sides of the sheet in the width direction Y may hang down. Therefore, if there is a step in the discharge chamber 120, the sheet may get caught on the step. As a countermeasure against this, an inclined surface 120b smoothly connected to the upper wall 120a of the discharge chamber 120 without a step is provided on the upstream side of the discharge chamber 120. As shown in FIG. As a result, the sheet is conveyed without being caught on the steps. 6, each of the two discharge chambers 120 has two inclined surfaces 120b spaced apart in the width direction Y. Then, only the inclined surface 120b on the side remote from the other discharge chamber 120 may be provided.

When the air escape hole 42b of the suction mechanism 32 is closed and suction from the plurality of suction ports 42a is started, and air for separation is discharged from the air discharge ports 48a and 48b of the air discharge mechanism 34, the uppermost sheet is The portion of the outer peripheral surface of the feeding belt 40 that faces the loading surface 20a and faces downward is attached to the "suction surface 50". After the sheet is attracted to the attraction surface 50, the feed belt 40 is rotated. As a result, the sheet is sent out toward the creasing section 12 . When the leading edge of the sheet reaches the pair of conveying rollers 56, the air escape hole 36c is opened to stop the suction from the plurality of suction ports 42a.

Please refer to FIGS. 7(a) to (c). The adjustment mechanism 26 is a mechanism for adjusting the inclination of the adsorption surface 50 with respect to the stacking surface 20a. The adjustment mechanism 26 adjusts the inclination by moving the adsorption surface 50 . The adjustment mechanism 26 adjusts the inclination of the adsorption surface 50 with respect to the loading surface 20a to a state in which the loading surface 20a and the adsorption surface 50 are parallel (see FIG. 7A), and a state in which the loading surface 20a and the adsorption surface 50 are in parallel toward the downstream side. It can be adjusted to a state of separating (see FIG. 7(b)) or a state of approaching toward the downstream side (see FIG. 7(c)). The adjustment mechanism 26 may be capable of adjusting the inclination in one step or in a plurality of steps with respect to the state in which the loading surface 20a and the adsorption surface 50 are separated from each other toward the downstream side (the state in FIG. 7B). It may be possible to adjust the inclination steplessly. Further, the adjusting mechanism 26 may be capable of adjusting the inclination in one step or in a plurality of steps with respect to the state in which the loading surface 20a and the attracting surface 50 approach each other toward the downstream side (the state in FIG. 7(c)). The inclination may be steplessly adjustable up to an angle of .

The adjustment mechanism 26 may move the suction surface 50 (that is, the feeding belt 40) together with the suction chamber 42 as shown in FIGS. In FIG. 7C, the suction surface 50 may be moved together with other members (for example, the valve mechanism 46) not shown, or unlike FIGS. 50 (ie, feed belt 40) may be moved.

In FIG. 7A, since the sheet is not warped, the inclination of the adsorption surface 50 is adjusted so that the stacking surface 20a and the adsorption surface 50 are parallel to each other. In FIG. 7B, the sheets are curved downward, that is, the sheets are warped so that both ends are positioned upward toward the ends. adjusting. In FIG. 7(c), the sheets are curved upward, that is, the sheets are warped so that both ends are located downward toward the ends. adjusting. In FIGS. 7B and 7C, the sheet and the adsorption surface 50 are parallel to each other over a wider range by adjusting the inclination of the adsorption surface 50 compared to when the adsorption surface 50 is not inclined. .

An example of a specific configuration of the adjustment mechanism 26 will be described with reference to FIGS. The adjustment mechanism 26 includes a moving frame 60, a lever 62 and a click stopper 64. The moving frame 60 rotates around the downstream roller 38 . When the moving frame 60 rotates, members directly or indirectly supported by it, specifically, the suction chamber 42, the feed belt 40 (attraction surface 50), the valve mechanism 46, and the detector 28 rotate. That is, the adjustment mechanism 26 moves the suction surface 50 together with the suction chamber 42 and also moves the detection section 28 together with the adsorption surface 50 . The adjustment mechanism 26 also moves the suction chamber 42 with the valve mechanism 46 . In this case, the configuration is relatively simple.

The lever 62 is fixed to the upper portion of the moving frame 60 and rotates together with the moving frame 60 . The click stopper 64 is fixed to the fixed frame 8 (not shown in FIGS. 4 and 5). When the user operates the lever 62 and the lower end of the lever 62 engages with one of the plurality of teeth of the click stopper 64, the lever 62, and thus the moving frame, rotates at a rotation angle corresponding to the tooth. 60 and thus the suction surface 50 are positioned. For example, a state in which the loading surface 20a and the adsorption surface 50 are parallel to each other, and a state in which the loading surface 20a and the adsorption surface 50 are separated from each other toward the downstream side and the acute angle formed by the loading surface 20a and the adsorption surface is 2° or 4°. and a state in which the loading surface 20a and the attracting surface 50 approach each other toward the downstream side, and the acute angle between the loading surface 20a and the attracting surface 50 is 2° or 4°. In either position, guide slopes 70 and 72 (see FIG. 2) lead to creasing section 12 .

(creasing part)
Please refer to FIG. The creasing section 12 includes a pair of upstream rollers 74 , a pair of downstream rollers 76 , a blade 78 , a receiving portion 80 and a sensor 82 .

The sensor 82 is provided downstream of the upstream roller 74 . The upstream roller 74 and the downstream roller 76 are driven by a main motor (not shown). The main motor is provided with an encoder. For example, when the leading edge of the sheet is detected by the sensor 82, the pulses from the encoder are counted and the sheet is stopped so that the position where the crease should be formed is directly below the blade 78. FIG. Blade 78 is lowered to score. Make two creases for tri-folding or double-folding. The driving of the upstream rollers 74 and the downstream rollers 76 is resumed to feed the sheet to the folding section 14 .

(Folding part)
Please refer to FIG. The folding section 14 includes a conveying roller 84 , a first folding roller 86 , a second folding roller 88 , a third folding roller 90 , a first folding knife 92 , a second folding knife 94 , and a pair of conveying rollers 96 . and prepare.

Each roller 84, 86, 88, 90, 96 of the folding section 14 is driven by a main motor. That is, the drive is applied from the same drive source as the rollers 74 and 76 of the creasing section 12 . Therefore, while the rollers 74, 76 of the creasing section 12 are stopped, the rollers 84, 86, 88, 90, 96 of the folding section 14 are also stopped.

The sheet sent to the folding section 14 is conveyed in the direction of arrow A by the conveying roller 84 , the first folding roller 86 , and the pair of conveying rollers 96 . When the sheet is not folded (when only the crease is formed), the sheet is discharged to the second stacker section 104 of the stacker section 16 as it is. The pair of conveying rollers 96 can be brought into contact with and separated from each other, and when folding a sheet as described later, the pair of conveying rollers 96 are separated from each other.

When the sheet is folded in half, the pulses from the encoder are counted, and the first folding knife is operated before the leading edge of the sheet reaches the folding section 14, for example, between the conveying roller 84 and the first folding roller 86. 92 is moved to the top dead center side (that is, toward between the first folding roller 86 and the second folding roller 88). The sheet is guided between the first folding roller 86 and the second folding roller 88 by the guide surface 92a of the first folding knife 92 and enters between the two guide plates 68a and 68b of the folding plate 68. As shown in FIG. The pulses from the encoder are counted, and the rollers 84, 86, 88, 90, and 96 are stopped at the timing when the crease made by the creasing section 12 arrives, and the second folding knife 94 and the second folding roller 88 are moved. It advances (moves) in the direction toward the third folding roller 90 . At the moment when the second folding knife 94 comes into contact with the sheet, or slightly before or after that, the driving of the rollers 84, 86, 88, 90, 96 is restarted, and the sheet is folded between the two folding rollers. let in. The sheet is caught between the second folding roller 88 and the third folding roller 90, folded along the crease, and discharged with the crease leading.

When the sheet is folded in three or double-folded, the pulses from the encoder are counted, and the rollers 84, 86, 88, 90, 96 are stopped at the timing when the crease made by the creasing section 12 arrives. The first folding knife 92 is raised in a direction toward between the first folding roller 86 and the second folding roller 88 . At the moment when the first folding knife 92 comes into contact with the sheet, or slightly before or after that, the driving of the rollers 84, 86, 88, 90, and 96 is resumed, and the sheet is folded between the two folding rollers. let in. The sheet is caught between the first folding roller 86 and the second folding roller 88, folded along the folding line, and enters between the two guide plates 68a and 68b of the folding plate 68 with the folding line leading. do.

Further, the pulses from the encoder are counted, and at the timing when another crease made by the creasing section 12 arrives, the rollers 84, 86, 88, 90 and 96 are stopped, and the second folding knife 94 is moved to the second fold. It advances (moves) in a direction between the second folding roller 88 and the third folding roller 90 . At the moment when the second folding knife 94 comes into contact with the sheet, or slightly before or after that, the driving of the rollers 84, 86, 88, 90, 96 is restarted, and the sheet is folded between the two folding rollers. let in. The sheet is caught between the second folding roller 88 and the third folding roller 90, folded along the crease, and discharged with the crease leading.

The timing for stopping the rollers 84, 86, 88, 90, 96 is, for example, the position where the leading edge of the first folding knife 92 or the second folding knife 94 comes into contact with the crease made by the creasing section 12. It is time to stop. Further, for example, the crease made by the creasing section 12 is slightly shifted upstream or downstream from the position where the tip of the advancing first folding knife 92 or the second folding knife 94 abuts. It may be the timing to stop at. Specifically, the position of the fold formed by the first folding roller 86 and the second folding roller 88 or the second folding roller 88 and the third folding roller 90 in the conveying direction X is determined by the creasing section 12 . The timing for stopping the rollers 84, 86, 88, 90, and 96 is appropriately determined through experiments and the like so as to match the positions of the folding lines in the conveying direction X. FIG. If the positional relationship between the crease and the crease varies depending on the quality, thickness, etc. of the sheet, the rollers 84, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86 are adjusted according to the quality, thickness, etc., of the sheet obtained in advance from input by the operator, sensors, communication lines, etc. The timing for stopping 88, 90, 96 may be determined.

Guide plates 75 and 77 are provided between the sensor 82 and the creasing section 12, and guide plates 79, 81 and 83 are provided between the creasing section 12 and the rollers 84 and 86, respectively. It guides the front and back of the sheet to be processed. After passing the sensor 82 , the sheet is conveyed between the guide plates 75 and 77 . After passing the creasing section 12 , the sheet passes between the guide plates 79 , 81 and the guide plate 83 . A guide plate is provided to guide the front and rear surfaces of the sheet over substantially the entire length of the sheet, excluding the creasing portion 12, from the time when the sheet passes the sensor 82 until it is sandwiched between the rollers 84 and 86. FIG. Further, the gaps in the thickness direction between the upper guide plates 75, 79, 81 and the lower guide plates 77, 83 are relatively narrow so that warping of the passing sheets in the thickness direction is suppressed. Specifically, it is, for example, about 1.5 to 2.5 mm. Further, the angle θ of the tangent line of the outer peripheral surface of the downstream roller with respect to the horizontal plane at the point where the outer peripheral surface of the lower roller of the upstream roller 74 and the upper surface of the guide plate 77 intersect is about 12 to 16°. When the leading edge of the conveyed sheet collides with the lower roller, the resistance is not excessive and the sheet can pass smoothly. The same applies to the angle of the tangential line at the point where the outer peripheral surface of the lower roller of the downstream roller 76 intersects with the upper surface of the guide plate 83 . With these configurations, warping of the sheet passing through the guide plates 75, 77, 79, 81, and 83 can be suppressed, and the sheet can be conveyed smoothly. The relationship with the actual conveying amount of the sheet is stabilized. As a result, the positions of the creases provided by the creasing section 12 and the folds provided by the folding rollers 86, 88, and 90 in the conveying direction X can be accurately matched.

The advance amount of at least one of the first folding knife 92 and the second folding knife 94 may be adjustable. If the sheet is thin and thus has low rigidity, the orientation of the leading edge will not be stable, so the advance amount of the folding knife is increased to ensure that the sheet is guided to the nip of the folding rollers. When the sheet is thick and thus rigid, the sheet is close to the folding knife by the thickness and is difficult to follow the outer peripheral surface of the folding roller, so it is easily damaged by sliding contact with the tip of the folding knife. Therefore, the advance amount of the folding knife is reduced. For example, an advance amount adjustment mechanism (not shown) that includes a rotating shaft, a drive motor that rotates the rotating shaft, and a conversion mechanism that converts rotation of the rotating shaft into linear movement of the folding knife. In addition, the advance amount of the folding knife may be managed by acquiring the rotation amount of the motor shaft of the drive motor or the rotation shaft with an encoder.

See FIG. The position of the guide plate 68b is a first position where the lower end is positioned at the first lower end position H1, and a position where the lower end is lower than the first lower end position H1 (that is, between the second folding roller 88 and the third folding roller 90). and a second position located at the second lower end position H2 (closer between ).

When the sheet S1 is thick and therefore rigid, the sheet S1 is difficult to bend. The sheet S1 cannot be completely bent toward between the roller 88 and the third folding roller 90, and is accumulated and jammed. Therefore, when the sheet S1 is thick, the guide plate 68b should be positioned at the first position.

When the sheet S1 is thin and thus has low rigidity, and the lower end of the guide plate 68b is at the first lower end position H1, the leading edge E of the sheet S1 passing between the first folding roller 86 and the second folding roller 88 is not sandwiched between the guide plates 68a and 68b, it becomes unstable and causes double folds and wrinkles. Therefore, when the sheet S1 is thin, the guide plate 68b should be positioned at the second position.

(Stacker part)
Please refer to FIG. The stacker section 16 includes a first stacker section 102 and a second stacker section 104 . The second stacker section 104 is provided below the first stacker section 102 . The first stacker section 102 includes a stacker plate 106 , a belt 108 intermittently driven on the stacker plate 106 , and rollers 110 rolling on the belt 108 . The sheet coming out from between the second folding roller 88 and the third folding roller 90 is discharged onto the intermittently driven belt 108 of the first stacker section 102, pressed by the roller 110 and stacked in half. be done. Sheets that are not folded (only with creases) are discharged to the second stacker section 104 .

(control part)
The control unit 18 has a CPU that executes various arithmetic processes, a ROM that stores various control programs, a RAM that is used as a work area for data storage and program execution, and the like. The control unit 18 controls the operation of actuators such as motors that drive each mechanism.

According to the present embodiment described above, when the sheet is warped, the inclination of the adsorption surface 50 with respect to the stacking surface 20a can be adjusted according to the direction and degree of the warp. As a result, even if a highly rigid sheet is warped, the sheet can be attracted to the attraction surface 50, thereby preventing the occurrence of idle feeding.

The present invention has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is merely an example, and that various modifications can be made to the combination of each component and each treatment process, and that such modifications are within the scope of the present invention. be. Such modifications will be described below.

(Modification 1)
In the embodiment, the case where the inclination of the adsorption surface 50 with respect to the loading surface 20a is adjusted by moving (tilting) the adsorption surface 50 has been described. tilt) to adjust the inclination of the adsorption surface 50 with respect to the loading surface 20a.

Please refer to FIG. A support shaft 21 extending in the width direction Y rotatably supports the upstream end of the stacking section (plate) 20 . The downstream end of the loading section 20 is moved up and down by, for example, a cam 23 . Thereby, the inclination of the stacking surface 20a with respect to the attracting surface 59 can be adjusted. Note that the downstream end of the stacking portion 20 may be supported by the support shaft 21 and the upstream end of the stacking portion 20 may be vertically moved. According to this modified example, it is possible to obtain the same effects as those of the embodiment.

(Modification 2)
Unlike the embodiment and the modification described above, the inclination of the adsorption surface 50 with respect to the loading surface 20a can only be adjusted so that the loading surface 20a and the adsorption surface 50 are separated from each other toward the downstream side (i.e., the non-adjustable). In this case, the warped sheet bundle may be stacked on the stacking surface 20a so that the warp faces upward.

Further, unlike the embodiment and the above-described modified example, the inclination of the adsorption surface 50 with respect to the loading surface 20a can be adjusted only in a state where the loading surface 20a and the adsorption surface 50 approach each other toward the downstream side (i.e., a state in which they separate toward the downstream side). may be non-adjustable). In this case, the warped sheet bundle may be stacked on the stacking surface 20a so that the warp faces downward.

(Modification 3)
Unlike the embodiment, for example, a camera or an appropriate sensor is provided to identify the direction and degree of warpage of the sheet bundle S on the stacking surface 20a, and the adjustment mechanism 26 includes a driving source such as a motor to determine the degree of warp. The adjustment mechanism 26 may automatically adjust the inclination of the adsorption surface 50 with respect to the stacking surface 20a according to the direction and degree of the warp. In this case, the user's burden is reduced.

Any combination of the embodiments and modifications described above is also useful as an embodiment of the present invention. A new embodiment resulting from the combination has the effects of each of the combined embodiment and modification. It should also be understood by those skilled in the art that the functions to be fulfilled by each constituent element described in the claims are realized by each constituent element shown in the embodiments and modified examples singly or in conjunction with each other.

Reference Signs List 1 sheet processing apparatus 10 sheet feeding mechanism 12 creasing section 14 folding section 20 stacking section 20a stacking surface 24 suction conveying mechanism 26 adjusting mechanism 28 detection section 32 suction mechanism 42 suction chamber 42a suction port, 46 valve mechanism, 50 adsorption surface.

Claims (9)

a stacking unit having a stacking surface on which the sheet bundle is stacked;
a suction conveying mechanism for suctioning the uppermost sheet of the stack of sheets on the stacking surface to the suction surface and feeding the sheet;
an adjustment mechanism capable of relatively adjusting the inclination of the adsorption surface with respect to the stacking surface according to the warpage of the sheet bundle when the sheet bundle is warped;
A sheet feeding mechanism. The adjustment mechanism is capable of adjusting the inclination between a state in which the loading surface and the adsorption surface are parallel to each other and a state in which the loading surface and the adsorption surface are separated from each other toward the downstream side or closer to each other toward the downstream side. Item 1. The sheet feeding mechanism according to item 1. 2. The sheet feeding mechanism according to claim 1, wherein the adjusting mechanism can adjust the inclination in multiple steps or steplessly. 2. The sheet feeding mechanism according to claim 1, wherein the adjusting mechanism adjusts the inclination by moving the attracting surface. The suction transport mechanism includes a suction mechanism for sucking a sheet and causing the sheet to be attracted to the suction surface,
The suction mechanism includes a suction chamber having a suction port on a surface facing the loading surface, a suction fan communicating with the suction chamber, and a valve mechanism capable of releasing negative pressure in the suction chamber,
5. The sheet feeding mechanism according to claim 4, wherein the adjustment mechanism moves the suction surface together with the suction chamber. 6. The sheet feeding mechanism of claim 5, wherein said adjustment mechanism moves said suction chamber with said valve mechanism. a detection unit that detects that the suction transport mechanism is pushed up by the sheet bundle on the stacking surface;
5. The sheet feeding mechanism according to claim 4, wherein the adjusting mechanism moves the detecting portion together with the attracting surface. a sheet feeding mechanism according to any one of claims 1 to 7;
a creasing section that creases the sheet fed from the sheet feeding mechanism;
A sheet processing device comprising: a sheet feeding mechanism according to any one of claims 1 to 7;
a folding knife that contacts the sheet fed from the sheet feeding mechanism and causes the sheet to enter between the pair of folding rollers;
A sheet processing device comprising:

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