JP2017144544A - Paper sheet conveying and cutting apparatus provided with mechanism for preventing sticking of cut piece of paper margin to cutter blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means for preventing sticking of a cut piece of a paper margin to a cutter blade.SOLUTION: A paper margin cut piece scraping-off device 14 is attached to cutter blades 5 and 6, the tip of the device is brought into contact with the cut surface of a paper margin cut piece 9 pressed into contact with the tips of the cutter blades, the cut surface of the paper margin cut piece is slid by the tip while tilting the paper margin cut piece scraping-off device by further motions of the cutter blades, the cut surface of the paper margin cut piece is peeled off from the tips of the cutter blades, and thus electrostatic suction between the tips of the cutter blades and the cut surface of the paper margin cut piece can be reduced. In addition, it has been found that the paper margin cut piece is kicked off at the time of completion of the cutting by the deformation stress of the paper margin cut piece generated between it and a paper margin uncut piece by the sliding of the cut surface before the completion of the cutting.SELECTED DRAWING: Figure 6

Description

  In the present invention, a sheet is cut in two directions, a direction crossing the sheet feeding direction (hereinafter referred to as a sheet feeding lateral direction) or a sheet feeding direction (hereinafter referred to as a sheet feeding longitudinal direction), With regard to an apparatus for obtaining a cut paper having a size different from the size of the printed sheet, or a cut paper divided into a plurality of pieces, the blank cut pieces generated when the paper is cut in the lateral direction are attached to the cutting machine blade. The present invention relates to a sheet conveying and cutting apparatus having a mechanism for preventing and eliminating the discharge retention and clogging of blank cutting pieces, clogging, and mixing into cutting paper.

  FIG. 1 schematically shows the structure of a cutting apparatus. In the conventional technique, the sheet 1 is fed out in the direction of the cutting machine 4 by the pair of upstream rollers 2 of the cutting machine, and the cutting length is determined by the amount of feeding from the cutting machine 4, and the downstream pair of rollers 3 in the cutting machine at the time of cutting. After being cut, the cutting paper supported by is discharged as a finished cutting paper by the pair of rollers 3 on the downstream side of the cutting machine. However, as shown in FIG. 2, when the paper leading edge feeding length 7 is shorter than the downstream roller pair / cutting machine distance 8, the blank cutting piece is supported by the cutting machine downstream roller pair 3. When the cutting is completed, the blank cutting piece falls between the cutting machine 4 and the pair of rollers 3 on the downstream side of the cutting machine. Further, when the trailing edge of the sheet is not supported by the upstream roller pair 2 on the upstream side of the cutting machine and remains on the upstream side of the cutting machine 4 at the time of cutting, the portion is a blank cutting piece and the cutting machine 4 and the cutting machine. It falls between the upstream roller pair 2. In either case, there is a risk that the blank cutting piece will stick to the cutting machine blade due to electrostatic attraction when it falls freely, and there is a problem with expecting a reliable discharge. The paper discharge system may be clogged or mixed into the cut paper.

  The blank cut pieces are discharged out of the system by free fall from a gap between the cutting machine 4 and the cutting machine upstream roller pair 2 or the cutting machine downstream roller pair 3. However, when static electricity is generated on the cut surface by cutting the sheet 1 in the paper feeding direction, the free fall of the blank cut pieces may be hindered by the electrostatic attraction of the cut surface.

  When the mass of the blank cutting piece is large, the mass overcomes the electrostatic attraction and falls freely, but when the mass is small, the electrostatic attraction cannot be overcome and sticks to the surface of the cutter blade. Will remain.

  Adhesion of the blank cut pieces to the cutting machine blade surface occurs when a cutting surface on which static electricity is charged is attracted to the cutting machine blade edge during cutting. The blank cut piece that is being cut is held by the uncut portion and does not fall, but when the cutting is completed, the blank cut piece is rotated downward by its mass about the cutting surface that is electrostatically attracted to the cutter edge. As a result, the blank cut piece sticks flatly to the surface of the cutter lower cutter.

  It is not easy to mechanically remove the blank cut pieces that are stuck flat on the surface of the cutter blade, and many attempts have been made so far, but there is a lack of decisiveness.

  The present invention has been made in view of the above points, and provides a means for preventing the blank cutting piece from sticking to the surface of the cutting machine blade during the cutting of the blank cutting piece. There is provided a method for smoothly and reliably discharging the liquid without sticking to the surface of the film in a flat manner.

  The present invention provides a mechanism for peeling the cutting surface from the cutting edge of the cutting machine blade during cutting on the cutting machine blade, or a device for limiting the free fall behavior after the cutting of the blank cutting piece is completed, and cutting the blank cutting piece. It is characterized by physically preventing sticking to the machine blade due to static electricity.

In particular, inside the paper cutting range of the cutting machine blade, there is a mechanism that contacts a part of the blank cutting piece during cutting and removes the cutting surface of the blank cutting piece from the cutting surface of the cutting machine blade by the operation of the cutting machine blade. It is characterized by preventing the sticking of the blank cutting piece to the cutting machine blade.

  Still further, a protrusion is provided on the inclined blade surface inside the paper cutting range of the cutting machine blade to prevent sticking of the blank cutting piece to the inclined blade surface when the cutting is completed, and the blank cutting piece is twisted. Alternatively, it is characterized in that a rotational movement is given to prevent sticking of the blank cutting piece to the cutting machine blade.

  In this way, since the margin cutting piece is narrow and lightweight, if the margin cutting piece cannot fall freely due to electrostatic attraction, the cutting surface starts from the tip of the lower cutter in conjunction with the movement of the upper cutter. The blank cut piece was partially peeled off before the cutting was completed by the apparatus for scraping off the blank, and the sticking of the blank cut piece could be prevented.

  Further, in the present invention, the projection attached to the cutting machine lower blade surface within the paper cutting range obstructs the flat sticking of the blank cutting piece to the cutting machine lower blade surface when the cutting is completed. It was possible to prevent the corrugated paper pieces from sticking to the cutter blade surface due to free fall.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a process of cutting the sheet / cut paper 10. The section AA shows an uncut state, and the leading edge of the sheet / cut paper 10 is fed out from the cutting machine 4 by a length corresponding to the width of the front margin blank cut piece 9. Cross section B-B shows the state of the sheet / cut paper 10 at the cutting point. The sheet / cut paper 10 is subjected to shear stress by the cutting machine upper blade 5 and the cutting machine lower blade 6, and the sheet is cut. At the same time as the cutting of the cutting paper 10, the front edge blank cut piece 9 is twisted downward. A section CC shows a state after cutting. As a result of the front edge blank cut piece 9 being twisted and bent downward, the cut surface is pressed against the cutting edge of the upper blade 5 of the cutting machine.

  FIG. 4 shows the behavior of the front edge blank cut piece 9 after the cutting is completed. In FIG. 4A, the front edge blank cut piece 9 immediately before cutting is completed is attracted to the cutting edge of the cutting machine upper blade 5 by electrostatic attraction, and is held diagonally without drooping by the slight holding force of the uncut portion. It shows the state. In FIG. 4B, as a result of the completion of cutting, the holding force of the uncut portion is lost, and the front edge blank cut piece 9 hangs down with the linear electrostatic attraction between the cut surface and the cutting machine upper blade 5 as the axis. It shows the state. When the upper blade 5 of the cutting machine is raised after the cutting is completed, the front edge blank cutting piece 9 is attached to the lower blade 6 of the cutting machine to be in the state shown in FIG. 4C or is pulled up to the cutting edge of the upper blade 5 of the cutting machine. As a result, the state shown in FIG.

  In order to guarantee the free fall of the front edge blank cut piece 9 by analyzing the mechanism by which the front edge blank cut piece 9 cannot freely fall after cutting is completed, the cutting surface and the cutting machine of the front edge blank cut piece 9 before the completion of cutting are as follows. It has been found that it is necessary to weaken the adsorption due to electrostatic attraction with the blade edge of the upper blade 5. From this point of view, a scraper for scraping off the cut surface of the front end blank cut piece 9 from the upper blade 5 during cutting of the sheet / cut paper 10, or a blank cut piece scraping device equipped with a brush is provided. It was decided to equip the cutting machine lower blade 6.

  FIG. 5 shows a state in which a blank cutting piece scraping device 14 for scraping the blank cutting piece 9 from the cutting edge of the cutting machine upper blade 5 is attached to the cutting machine lower blade 6. The blank cutting piece scraping device 14 comes into contact with the cutting surface of the front edge blank cutting piece 9 that is lowered by electrostatic adsorption to the cutting edge of the upper blade 5 of the cutting machine before the cutting is completed. It acts to scrape off the cut surface of the front edge blank cut piece 9 before the cutting is completed. For this purpose, the leading edge (working point) of the blank cutting piece scraping device 14 is located between the cutting start position 11 and the cutting completion position 12, and before the cutting is completed, the tip of the cutting machine upper blade 5 is electrostatically charged. It is necessary to contact the cutting surface of the front edge blank cutting piece 9 that is adsorbed, and as shown in FIG. 5, the blank cutting piece scraping device 14 is attached to the inside of the cutting range from the cutting start position 11.

  FIG. 6 shows the function of the margin cutting piece scraping device 14. FIG. 6 (A) shows a state in which the cutting machine upper blade 5 is in the stop position, and the tip (working point) of the blank cutting piece scraping device 14 is located below the cutting edge of the cutting machine lower blade 6. I understand. FIG. 6B shows a state immediately before the cutting machine upper blade 5 is lowered and the cutting is completed, and the front end (working point) of the blank cutting piece scraping device 14 is electrostatically attracted to the cutting machine upper blade 5. It is in contact with the cut surface of the blank cut piece 9. FIG. 6C shows a state in which the cutting machine upper blade 5 is further lowered, and the leading edge (working point) of the blank cutting piece scraping device 14 is further pushed down by the cutting edge of the cutting machine upper blade 5, and the leading edge (working point). ) Slides on the blade surface of the upper cutter 5 together with the margin cutting piece 9, the margin cutting piece scraping device 14 is tilted, and the cutting surface is peeled off from the lower cutter 6.

  Immediately after this, the cutting of the front edge blank cutting piece 9 is completed, but a part of the cutting surface has already been peeled off from the lower cutting blade 6 of the cutting machine, and the cutting is performed by the deformation stress applied to the front edge blank cutting piece 9 at that time. At the completion, the front end blank cut piece 9 is flipped off, and the front end blank cut piece 9 is effectively prevented from sticking to the cutter blade.

  The leading edge (working point) of the blank cutting piece scraping device 14 slides on the blade surface of the cutting blade upper blade 5 because the blank cutting piece scraping device 14 is elastically attached to the lower cutting blade 6 and the blank is cut. This is because the cutting piece scraping device 14 is inclined, and the blank cutting piece scraping device 14 is made of an elastic material, or is attached to the cutting machine lower blade 6 via an elastic body such as a spring. Because.

  The tip (working point) of the blank cutting piece scraping device 14 is exemplified by a spatula such as a scraper, but may be made of a suitable material such as a brush or rubber.

  Hereinafter, an embodiment of the rear edge cut paper piece 15 of the present invention will be described with reference to the drawings. FIG. 7 shows a process of cutting the sheet / cut paper 10. Cross section AA shows an uncut state, and the rear end of the sheet / cut paper 10 is left by a length corresponding to the width of the rear end blank cut piece 15 from the cutting machine 4. Section BB shows the state at the cutting point of the sheet / cut paper 10, and the sheet / cut paper 10 is subjected to shear stress by the upper cutter blade 5 and the lower cutter blade 6, and simultaneously with the cutting. The rear edge blank cut piece 15 is twisted upward. Section C-C shows the state after cutting, and the rear end of the cut sheet / cut paper 10 is pushed down by the cutting machine upper blade 5, and the end margin cutting piece 15 is twisted upward and simultaneously, The cut surface is pressed against the cutting edge of the lower cutter 6.

  FIG. 8 shows the behavior of the trailing edge blank cut piece 15 after cutting is completed. FIG. 8 (A) shows that the trailing edge blank cut piece 15 immediately before the cutting is completed is attracted to the cutting edge of the cutting machine upper blade 5 by electrostatic attraction and held diagonally without drooping due to a slight holding force of the uncut portion. It shows the state being done. FIG. 8B shows that as a result of the completion of cutting, the holding force of the uncut portion is lost, and the trailing edge blank cut piece 15 that has been attracted to the cutting edge of the lower cutting blade 6 by electrostatic attraction is dropped on the axis. And the state which has stuck on the inclined blade surface of the cutting machine lower blade 6 is shown. When the cutting blade upper blade 5 rises after the cutting is completed, the trailing edge blank cutting piece 15 freely falls by its own weight as shown in FIG. 8C, or the cutting device lower blade 6 as shown in FIG. 8D. It will be in the state which sticks to an inclined blade surface stably and remains.

  FIG. 9 shows an attachment method for applying the blank cutting piece scraping device 14 proposed in the first embodiment to scraping off the trailing edge blank cutting piece 15. Since the cutting surface of the trailing edge cutting piece 15 electrostatically attracted to the cutting edge of the cutting machine lower blade 6 is scraped off from the cutting edge of the cutting machine lower blade 6, the blank cutting piece scraping device 14 is not the cutting machine lower blade 6 but the cutting machine. The upper blade 5 is attached to the inside of the cutting range from the cutting start point 11.

  FIG. 10 shows a cutting process of the trailing edge blank cutting piece 15 in a state where the blank cutting piece scraping device 14 is mounted on the upper blade 5 of the cutting machine. FIG. 10A shows a state before starting cutting. FIG. 10B shows the trailing edge margin in which the cutting (cutting point) of the blank cutting piece scraper 14 attached to the cutting blade upper blade 5 is electrostatically attracted to the cutting edge of the cutting blade lower blade 6 as the cutting progresses. The state which is contacting the cutting surface of the cutting piece 15 is shown. FIG. 10C shows a state in which the cutting blade upper blade 5 is further lowered and one step before the completion of cutting. The margin cutting piece scraping device 14 has its tip (operating point) already on the cutting surface of the cutting blade lower blade 6. The front edge cannot be lowered because it is riding, and the leading edge (working point) is slid onto the inclined blade surface of the lower cutter 6 while the margin cutting piece scraper 14 is tilted, and the trailing edge margin is simultaneously cut. The piece 15 is peeled off from the cutting edge of the lower cutter 6 and positioned on the blade surface.

  The trailing edge blank cutting piece 15 immediately before the cutting is completed is placed on the inclined blade surface of the lower cutting blade 6 at the front end position of the blank cutting piece scraping device 14, and at the cutting point, it is twisted upward by shearing stress of cutting. Therefore, the rear end blank cut piece 15 is subjected to deformation stress of torsional stress. For this reason, it can be expected that the trailing edge blank cut piece 15 is repelled by the release of the stress when the cutting is completed and falls freely from the inclined blade surface of the cutting machine lower blade 6. However, when the cutting is completed, the trailing edge blank cutting piece 15 is located not on the free-falling space but on the inclined blade surface of the lower blade 6 of the cutting machine. It is doubtful to stop.

  In Example 2, there was a concern that the trailing edge blank cut piece 15 may remain without falling on the inclined blade surface of the lower blade 6 of the cutting machine without dropping. Therefore, in the third embodiment, the lower edge cutter 15 shown in FIG. 11 is used so that the trailing edge blank cut piece 15 after cutting is not stuck in a flat surface to the inclined blade surface of the lower cutter 6 and remains stably. A blade protrusion 16 was provided. The cutting machine lower blade edge projection 16 is positioned between the blank cutting piece scraping device 14 and the cutting end position 12, and prevents the rear end blank cutting piece 15 from contacting the flat surface with the cutting machine lower blade edge surface. The function of holding the edge margin cutting piece 15 near the paper plane is shown.

  As shown in FIG. 12, the trailing edge blank cutting piece 15 is pushed down in the direction of the cutting machine lower blade surface at the position of the blank cutting piece scraping device 14, and the cutting machine lower blade at the position of the cutting machine lower blade blade surface projection 16. It is lifted to the vicinity of the horizontal surface of the cutting edge, and further, at the cutting point, it is twisted upward by the shearing stress during cutting. As a result, the trailing edge blank cutting piece 15 is prevented from being electrostatically attracted to the cutting edge by the blank cutting piece scraping device 14 immediately before the cutting is completed, and is subjected to twisting and bending deformation stress. Once the cutting is completed and the restraint by the uncut portion is released, the trailing edge blank cut piece 15 will pop off and the surface of the lower cutting blade 6 of the cutting machine 6 will not come into surface contact, so it will fall freely. It becomes.

  Sheet conveyance by two pairs of rollers and a cutter   The front margin of the paper is fed to the downstream side of the cutting machine   Cutting process of leading edge blank cut pieces by cutting machine   4A Front edge blank cut piece immediately before cutting completion FIG. 4B Front edge blank cut piece immediately after cutting completion FIG. 4C Cut off after completion of cutting and stuck to the vertical surface of the lower blade of the cutting machine Front end margin cutting piece Fig. 4D Front end margin cutting piece cut off by cutting completion and picked up by the upper blade edge of the cutting machine   Attaching the blank cutting piece scraping device to the lower blade of the cutting machine   Scraping operation progress of the front edge blank cut piece by the blank cutting piece scraping device Fig. 6A State before starting cutting Fig. 6B Front edge blank cutting piece during cutting Fig. 6C Blank cutting piece scraping device immediately before cutting from the upper blade edge of the cutting machine Scraped off front edge margin   Cutting process of trailing edge blank cut pieces by cutting machine   8B Rear end margin cutting piece immediately before cutting completion FIG. 8B Rear end margin cutting piece immediately before cutting completion FIG. 8B Rear end margin cutting piece immediately after cutting completion FIG. Fragment Figure 8D Rear edge blank cut piece cut off by cutting completion and attached to the cutting blade lower blade inclined blade surface   Installation condition of the blank cutting piece scraper to the upper blade of the cutting machine   Scraping operation progress of the trailing edge blank cut piece by the blank cutting piece scraping device FIG. 10A State before starting cutting FIG. 10B Rear edge blank cutting piece during cutting FIG. 10C Cutting blade lower blade by blank cutting piece scraping device immediately before cutting completion The trailing edge margin trimmed from the blade edge   Cutting state of cutting blade lower blade surface projection on cutting blade lower blade surface   Cutting machine lower blade edge protrusions trailing edge margin cutting effect to prevent sticking

1. Sheet of paper 2. 2. Cutting machine upstream roller pair 3. A pair of rollers on the downstream side of the cutting machine 4. Cutting machine Cutting machine upper blade (movable blade)
6). Cutting blade lower blade (fixed blade)
7). 7. Paper tip feed length 8. Distance between downstream roller pair / cutting machine Front edge margin cutting piece 10. Sheets and papers 11. Cutting start position 12. Cutting completion position 13. Cutting point 14. 15. Blank cutting piece scraping device Rear edge margin cutting piece 16. Cutting machine

Claims (3)

  In a device that transports a sheet by two pairs of rollers and cuts the sheet into a predetermined length by a cutter located between the two pairs of rollers, from the cutting start position of the lower blade of the cutter The cutting surface of the front edge blank cutting piece, the tip of the blank cutting piece scraper attached at the inner position of the cutting range is lowered and pressed against the cutting blade upper blade surface as the cutting blade upper blade is being cut. The upper edge of the cutting machine is pushed down by the lower edge of the cutting machine, and the inclined cutting surface of the upper edge of the cutting machine slides along with the cutting surface of the front edge blank cutting piece while tilting the blank cutting piece scraping device. The front edge blank cut piece loses the holding power of the uncut part and the electrostatic suction force by the lower cutting edge of the cutting machine of the cut surface, and the front edge blank cut piece is accumulated by the deformation stress of the front edge blank cut piece accumulated just before the cutting is completed. Cutting Sheet cutting apparatus, characterized in that has a function to flick off from the lower blade   In an apparatus that transports a sheet by two roller pairs and cuts the sheet into a predetermined length by a cutter located between the two roller pairs, from the cutting start position of the upper blade of the cutter The leading edge of the blank cutting piece scraper attached at the inner position of the cutting range comes into contact with the cutting surface of the trailing edge blank cutting piece located on the cutting blade lower blade surface as the cutting blade upper blade being cut is lowered. When the upper cutting edge of the cutting machine is further lowered, the blank cutting piece scraper is tilted and the inclined blade surface of the lower cutting blade slides along with the cutting surface of the trailing edge blank cutting piece, and cutting is performed upon completion of cutting. The trailing edge blank cut piece loses the holding power of the uncut part and the electrostatic attraction force by the lower cutting edge of the cutting machine of the cutting surface, and the trailing edge margin cutting is performed by the deformation stress of the trailing edge blank cutting piece itself accumulated immediately before the cutting is completed. From the cutting blade lower blade Sheet cutting apparatus, characterized in that has a function to skip upcoming   In the sheet cutting apparatus presented in claim 2, when the trailing edge blank cut piece is not sufficiently blown off from the cutting machine lower blade when cutting is completed, the cutting machine lower blade surface is not a vertical surface but an inclined surface. Therefore, there is a possibility that the trailing edge blank cut piece that has been cut due to cutting may remain in contact with the inclined blade surface of the lower blade of the cutting machine, and prevent the rear edge blank cutting piece from contacting the surface of the lower blade edge of the cutting machine. A sheet cutting device characterized in that a protrusion is provided on the blade surface of the lower blade for the purpose.

Images