JP6474675B2 - Sheet removal device - Google Patents

Description

  The present invention relates to a sheet removing apparatus capable of removing only a specific sheet without stopping the conveyor when a sheet of sheets is being conveyed by the conveyor.

  2. Description of the Related Art A sheet removing apparatus that can remove only defective sheets without stopping the conveyor when a single sheet is being conveyed by a conveyor is known (for example, Patent Document 1).

  The sheet removing apparatus disclosed in Patent Document 1 is hung between an inlet side roller disposed on the upstream side in the sheet conveying direction, an outlet side roller disposed on the downstream side in the sheet conveying direction, and the inlet side roller and the outlet side roller. A belt conveyor having a conveyed conveyor belt, which sequentially receives and conveys corrugated cardboard sheets continuously supplied from the upstream side onto the conveyor belt and discharges them downstream. Further, the exit side roller is configured to move up and down between a rising position having the same height as the entrance side roller and a lowering position having a lower height than the entrance side roller. It is possible to switch the height up and down.

  In the sheet removing device disclosed in Patent Document 1, when no defect is detected by the defect detection device arranged on the upstream side of the sheet removal device, the corrugated sheet is conveyed while the outlet roller is raised, and a good cardboard sheet is removed. Send to the downstream conveyor. On the other hand, when a defect is detected by the defect detection device, the outlet side roller is lowered to send the defective corrugated cardboard sheet to a defective product container installed below the downstream conveyor.

JP-A-11-278731

  By the way, when installing the sheet removing apparatus of Patent Document 1, it is necessary to set a long distance from the defect detecting apparatus to the sheet removing apparatus in order to secure time required for pass / fail judgment by the defect detecting apparatus.

  That is, the sheet removing apparatus disclosed in Patent Document 1 tracks the position of the front end of the sheet when the defective sheet is detected by the defect detecting apparatus disposed on the upstream side, and the front end of the sheet passes through the sheet removing apparatus. The sheet removal operation (the lowering operation of the exit side roller) is performed at the timing. Here, in order to remove the sheet determined to be defective by the sheet removing apparatus, the sheet before the front end of the sheet (that is, the portion that has advanced to the most downstream side of the sheet) reaches the sheet removing apparatus. It is necessary to complete the pass / fail judgment by the defect detection device. For this reason, when the sheet removal apparatus disclosed in Patent Document 1 is introduced, it is necessary to set a long distance from the defect detection apparatus to the sheet removal apparatus in order to secure time required for pass / fail judgment by the defect detection apparatus. There was a problem that the line had to be relatively long.

  In addition, when the sheet removing device of Patent Document 1 is introduced into an existing sheet conveying line, the existing conveyor is removed and a new conveyor having a structure in which the exit side roller is raised or lowered is installed, or the existing conveyor is installed. It is necessary to make a large modification so that the exit side roller moves up and down. Therefore, there is also a problem that the introduction cost of the sheet removing device is high.

  The problem to be solved by the present invention is to provide a sheet removing apparatus that can be introduced into a relatively short sheet conveying line.

In order to solve the above problems, the present invention provides a sheet removing apparatus having the following configuration.
An arm rotation shaft arranged above a sheet conveying conveyor that conveys a sheet of sheets with a gap between the front and rear sheets;
A rotary which is provided so as to extend radially outward from the arm rotation shaft, and rotates integrally with the arm rotation shaft so as to scoop up the front sheet through the front and rear gaps between the sheets being conveyed by the sheet conveyance conveyor Arm,
An arm tip roller provided at the tip of the rotary arm so as to contact the lower surface of the sheet when scooping up the sheet with the rotary arm;
A sheet discharge that is arranged above the sheet conveying conveyor so that the upper surface of the sheet picked up by the rotary arm contacts, and rotates so as to feed the contacted sheet in the direction opposite to the sheet conveying direction of the sheet conveying conveyor. A driving roller;
A sheet removing apparatus.

  In this case, the sheet being conveyed by the sheet conveying conveyor is picked up by the rotary arm provided above the sheet conveying conveyor and brought into contact with the sheet discharge driving roller, and the contacted sheet is opposite to the sheet conveying direction of the sheet conveying conveyor. Since the sheet is sent and removed in the direction, the sheet can be introduced into a shorter sheet conveying line as compared with the conventional sheet removing apparatus that sends and removes the sheet in the same direction as the sheet conveying direction of the sheet conveying conveyor.

  In addition, when the sheet removing apparatus of the present invention is introduced into an existing sheet conveying line, a member such as a rotary arm is added above the existing sheet conveying conveyor without greatly modifying the existing sheet conveying conveyor. Since it can be introduced, the introduction cost of the sheet removing apparatus can be suppressed.

  The rotary arm is preferably formed in a U-shape that is recessed rearward in the rotation direction.

  This prevents the leading edge in the rotational direction of the rotary arm from interfering with the trailing end of the sheet when the arm leading roller provided at the leading end of the rotary arm is brought into contact with the lower surface of the sheet to scoop up the sheet. Therefore, the sheet can be picked up smoothly.

  It is preferable that at least one pair of the rotary arms is provided so as to be 180 degrees rotationally symmetric about the arm rotation axis.

  In this way, the sheets can be scooped up by alternately using a pair of rotationally symmetric rotary arms of 180 degrees, so that a plurality of sheets conveyed from the upstream side can be removed continuously.

  When at least a pair of the rotary arms are provided so as to be rotationally symmetrical by 180 degrees around the arm rotation axis, the rotary arms are separated from the front of the sheet discharge drive roller in the traveling direction of the sheet fed by the sheet discharge drive roller. A second sheet discharge drive roller that rotates in the same direction as the sheet discharge drive roller is provided at a position between the rotary arm of the pair of rotationally symmetric rotary arms and the sheet discharge drive roller, and the other rotary It is preferable that the sheet is transferred between the arm and the second sheet discharge driving roller.

  In this way, when the sheet is transferred between the one rotary arm and the sheet discharge driving roller and between the other rotary arm and the second sheet discharge driving roller, the two positions are separated in the sheet traveling direction. Since the sheet is guided at this position, the traveling direction of the sheet when the sheet is fed by the sheet discharge driving roller can be stabilized.

  In the sheet removing apparatus of the present invention, the sheet being conveyed by the sheet conveying conveyor is picked up by the rotary arm provided above the sheet conveying conveyor and brought into contact with the sheet discharge driving roller, and the contacted sheet is conveyed in the sheet conveying direction of the sheet conveying conveyor. Therefore, the sheet can be introduced into a shorter sheet conveying line than a conventional sheet removing apparatus that sends and removes a sheet in the same direction as the sheet conveying direction of the sheet conveying conveyor.

The figure which shows the example which installed the sheet | seat removal apparatus of embodiment of this invention in the downstream of a printing machine FIG. 1 is an enlarged view of the vicinity of the sheet removing apparatus. The figure which looked at the sheet removal apparatus shown in Drawing 2 from the upper part FIG. 3 is an enlarged view showing the sheet removing device shown in FIG. Sectional view along line VV in FIG. Enlarged view of the sheet removing apparatus shown in FIG. The figure which shows the state which the rotary arm shown in FIG. 6 rotates, and passes along the clearance gap between the corrugated cardboard sheets in conveyance The figure which shows the state which the rotary arm shown in FIG. 7 further rotated, and scooped up the front cardboard sheet | seat FIG. 8 is a view showing a state in which the corrugated board sheet shown in FIG. 8 is being fed in the direction opposite to the sheet conveying direction of the sheet conveying conveyor by being sandwiched between the sheet discharge driving roller and the arm tip roller FIG. 9 is a diagram illustrating a state in which the corrugated cardboard sheet illustrated in FIG. 9 is transferred from the sheet discharge driving roller to the second sheet discharge driving roller. FIG. 10 is a view showing a state in which the corrugated board sheet shown in FIG. 10 is fed in the direction opposite to the sheet conveying direction of the sheet conveying conveyor by being sandwiched between the second sheet discharge driving roller and the arm tip roller. 11 is a view showing a state in which the corrugated cardboard sheet shown in FIG. 11 is discharged from between the second sheet discharge driving roller and the arm tip roller and is stored in the removal sheet storage unit.

  FIG. 1 shows an example in which a sheet removing apparatus 1 according to an embodiment of the present invention is installed on the downstream side of a printing machine 2. The printing machine 2 is a sheet-fed printing machine that sequentially prints on the corrugated cardboard sheets 3 that are fed one by one from the upstream side, and feeds the corrugated cardboard sheets 3 printed one by one to the downstream side.

  At the outlet of the printing press 2, a defect detection device 4 for determining whether the corrugated cardboard sheet 3 is good or bad is provided. The defect detection apparatus 4 is a printing inspection apparatus that inspects whether there is no printing defect such as chipping or misalignment in the printing of the cardboard sheet 3. When the printing machine 2 is of a type that also performs grooving of the corrugated cardboard sheet 3, a grooving inspection device that detects the shift of the grooving position may be employed as the defect detection device 4.

  A sheet conveying conveyor 5 is provided on the downstream side of the printing machine 2. The sheet conveying conveyor 5 includes a plurality of rollers 6, 7, 8, and 9 disposed at intervals in the sheet conveying direction, and a conveying belt 10 that is stretched between these rollers 6, 7, 8, and 9. 11. Corrugated cardboard sheets 3 discharged from the printing machine 2 one by one are sequentially landed on the conveyor belt 10 and conveyed forward.

  The traveling speed of the conveyor belts 10 and 11 is set to a speed at which the corrugated cardboard sheets 3 sequentially discharged from the printing machine 2 are conveyed without being overlapped and the corrugated cardboard sheets 3 are conveyed with a gap between the front and rear corrugated cardboard sheets 3. . For example, when the length per cardboard sheet 3 is L (m) and the number of cardboard sheets 3 conveyed by the sheet transport conveyor 5 per minute is N (sheets / minute), L × N (m / The conveyor belts 10 and 11 are driven at a traveling speed greater than (min).

  The sheet conveying conveyor 5 includes an inlet conveyor portion 5a on which the corrugated sheet 3 discharged from the printing machine 2 lands, and an inclined conveyor in which the height of the sheet conveying surface (that is, the upper surface of the conveying belt 11) gradually increases toward the downstream side. Part 5b and a horizontal conveyor part 5c having a horizontal sheet conveying surface. The roller 7 on the exit side of the entrance conveyor unit 5a and the roller 7 on the entrance side of the inclined conveyor unit 5b are common rollers. The roller 8 on the outlet side of the inclined conveyor portion 5b and the roller 8 on the inlet side of the horizontal conveyor portion 5c are also common rollers. The inclination of the sheet conveying surface of the sheet conveying conveyor 5 changes from the upward inclination to the horizontal at the position of the roller 8 between the inclined conveyor part 5b and the horizontal conveyor part 5c.

  As shown in FIG. 2, the sheet removing apparatus 1 includes an arm rotation shaft 12 disposed to face an upper side of the conveyance belt 11 of the inclined conveyor portion 5 b, and a rotary arm 13 extending radially outward from the arm rotation shaft 12. A sheet discharge drive roller 14 and a second sheet discharge drive roller 15, and a removal sheet storage unit 16.

  The arm rotation shaft 12 is disposed in parallel to the direction orthogonal to the sheet conveyance direction (that is, the left-right direction of the cardboard sheet 3 being conveyed) within the plane of the cardboard sheet 3. A sheet passage space 17 through which the cardboard sheet 3 can pass is formed between the arm rotating shaft 12 and the conveyor belt 11.

  The rotary arms 13 are provided in at least a pair (in this embodiment, two pairs spaced apart in the axial direction as shown in FIG. 4) so as to be 180 degrees rotationally symmetric around the arm rotation shaft 12. Each rotary arm 13 is fixed to the outer periphery of the arm rotation shaft 12 so as to rotate integrally with the arm rotation shaft 12. The length of each rotary arm 13 is longer than the distance between the arm rotating shaft 12 and the conveying belt 11 (that is, the height of the sheet passing space 17). The rotary arm 13 rotates in a direction (the counterclockwise direction in the drawing) in which the moving direction of the rotary arm 13 when the rotary arm 13 passes through the sheet passing space 17 is the same as the traveling direction of the transport belt 11.

  As shown in FIG. 6, an arm tip roller 18 is provided at the tip of the rotary arm 13. The arm tip roller 18 is a roller that contacts the lower surface of the cardboard sheet 3 when the rotary arm 13 scoops up the cardboard sheet 3. The rotary arm 13 is made of a light alloy such as aluminum in order to suppress the moment of inertia. The outer peripheral surface of the arm tip roller 18 is made of rubber.

  The rotary arm 13 is formed in a U-shape that is recessed rearward in the rotation direction. When the rotary arm 13 is assumed to be a straight line L connecting the center of the arm tip roller 18 and the center of the arm rotation shaft 12 when viewed in the axial direction, the front edge in the rotational direction passes through the rear side of the rotational direction with respect to the straight line L. 21. The front edge 21 in the rotational direction of the rotary arm 13 is an outer circumferential circle of the arm front roller 18 on the rear side in the rotational direction with respect to the straight line L connecting the center of the arm front roller 18 and the center of the arm rotary shaft 12 when viewed in the axial direction. It has a shape that intersects.

  In order to make the operation of scooping up the cardboard sheet 3 with the rotary arm 13 smooth, the arm rotation shaft 12 is preferably provided at a position where the height from the conveyor belt 11 is relatively low. Specifically, the distance from the upper surface of the conveyor belt 11 to the center of the arm rotation shaft 12 is the minimum length of the corrugated cardboard sheet 3 conveyed by the sheet conveying conveyor 5 (here, the corrugated cardboard sheet 3 that can be printed by the printing machine 2). It is preferable to set it to half or less of the minimum length.

  Further, the arm rotation shaft 12 starts from the position of the leg of the perpendicular line that is lowered from the arm rotation shaft 12 to the conveyor belt 11 of the inclined conveyor section 5b, from the roller 8 on the outlet side of the inclined conveyor section 5b, to the conveyor belt 11 of the inclined conveyor section 5b. The distance to the position of the foot of the vertical line that is lowered is shorter than the maximum length of the corrugated cardboard sheet 3 conveyed by the sheet conveying conveyor 5 (here, the maximum length of the corrugated cardboard sheet 3 that can be printed by the printing machine 2). Are arranged as follows. Thereby, it is possible to smoothly scoop up a relatively long cardboard sheet 3 with the rotary arm 13.

  As shown in FIG. 8, the sheet discharge driving roller 14 is configured such that when the corrugated sheet 3 being conveyed is scooped up by the rotary arm 13, the sheet discharge conveyor roller 14 is brought into contact with the sheet discharge driving roller 14. 5 is disposed above. The sheet discharge driving roller 14 is parallel to the arm rotation shaft 12. The sheet discharge driving roller 14 is picked up by the rotary arm 13 and sends the corrugated cardboard sheet 3 in contact with the sheet discharge driving roller 14 in the direction opposite to the sheet conveying direction (rightward in the figure) of the sheet conveying conveyor 5 (leftward in the figure). Rotate like so. The rotation direction of the sheet discharge drive roller 14 is opposite to the rotation direction of the arm rotation shaft 12.

  The second sheet discharge drive roller 15 is disposed at a position away from the sheet discharge drive roller 14 in the forward direction of the corrugated cardboard sheet 3 sent out by the sheet discharge drive roller 14. That is, the second sheet discharge drive roller 15 is provided at a position away from the position of the sheet discharge drive roller 14 in the opposite direction (leftward in the figure) to the sheet conveyance direction (rightward in the figure) of the sheet conveyance conveyor 5. Yes. The second sheet discharge drive roller 15 is parallel to the sheet discharge drive roller 14. The second sheet discharge drive roller 15 rotates in the same direction as the sheet discharge drive roller 14.

  The second sheet discharge drive roller 15 is a state in which the corrugated cardboard sheet 3 is sandwiched between one rotary arm 13 and the sheet discharge drive roller 14 out of a pair of rotary arms 13 arranged in rotational symmetry of 180 degrees. The second sheet discharge driving roller 15 is disposed at a position spaced upward from the rotary arm 13. By arranging the second sheet discharge driving roller 15 in this way, one rotary arm 13 (that is, the rotary arm 13 scooping up the cardboard sheet 3) out of the pair of rotary arms 13 arranged in rotational symmetry of 180 degrees. And the sheet discharge drive roller 14 between the other rotary arm 13 (that is, the rotary arm 13 opposite to the rotary arm 13 scooping up the cardboard sheet 3) and the second sheet discharge drive roller 15. Can be handed over.

  The sheet discharge drive roller 14 and the second sheet discharge drive roller 15 are arranged such that the common tangent passes above the arm rotation shaft 12 when a common tangent in contact with the lower side of both rollers is assumed. This prevents the corrugated cardboard sheet 3 from interfering with the arm rotation shaft 12 when the corrugated cardboard sheet 3 is transferred from the sheet discharge driving roller 14 to the second sheet discharge driving roller 15.

  As shown in FIG. 6, the sheet discharge driving roller 14 includes a roller shaft 22 that is rotatably supported, and an annular roller body 23 that is provided coaxially with the roller shaft 22 so as to rotate integrally with the roller shaft 22. Have A plurality of roller bodies 23 are provided at intervals in the axial direction. The outer peripheral surface of the roller body 23 is made of rubber. The roller body 23 has an outer diameter larger than the outer diameter of the roller shaft 22. The length of the rotary arm 13 is longer than the distance from the arm rotation shaft 12 to the outer periphery of the roller body 23 and shorter than the distance from the arm rotation shaft 12 to the outer periphery of the roller shaft 22. The roller body 23 is disposed at a position shifted in the axial direction with respect to the position of the rotary arm 13. This prevents the rotary arm 13 from interfering with the sheet discharge driving roller 14 when the rotary arm 13 rotates.

  The second sheet discharge driving roller 15 also includes a roller shaft 24 that is rotatably supported, and an annular roller body 25 that is provided coaxially with the roller shaft 24 so as to rotate integrally with the roller shaft 24. A plurality of roller bodies 25 are provided at intervals in the axial direction. The outer peripheral surface of the roller body 25 is made of rubber. The roller body 25 has an outer diameter larger than the outer diameter of the roller shaft 24. The length of the rotary arm 13 is longer than the distance from the arm rotation shaft 12 to the outer periphery of the roller body 25 and shorter than the distance from the arm rotation shaft 12 to the outer periphery of the roller shaft 24. The roller body 25 is disposed at a position shifted in the axial direction with respect to the position of the rotary arm 13. This prevents the rotary arm 13 from interfering with the second sheet discharge drive roller 15 when the rotary arm 13 rotates.

  As shown in FIG. 2, a guide bar 26 is provided between the sheet discharge drive roller 14 and the second sheet discharge drive roller 15. The guide bar 26 is a bar-like member disposed along a position of a common tangent line that is in contact with the lower side of the sheet discharge drive roller 14 and the second sheet discharge drive roller 15. By providing the guide bar 26, when the corrugated sheet 3 is transferred from the sheet discharge driving roller 14 to the second sheet discharge driving roller 15, the front end in the traveling direction of the cardboard sheet 3 collides with the second sheet discharge driving roller 15. It is possible to prevent this.

  As shown in FIG. 3, a plurality of conveying belts 10 and 11 of the sheet conveying conveyor 5 are arranged at intervals in a direction orthogonal to the sheet conveying direction. Two pairs of rotary arms 13 are provided at intervals in the axial direction.

  As shown in FIGS. 4 and 5, the two pairs of rotary arms 13 are fixed to the arm rotation shaft 12 so as to be in phase with each other (that is, the relative position in the circumferential direction of the rotary arm 13 with respect to the arm rotation shaft 12 is the same). Has been. The two pairs of rotary arms 13 are arranged between the adjacent conveyor belts 11 so that the position of the rotary arm 13 and the position of the conveyor belt 11 do not overlap. Between the adjacent conveying belts 11 of the sheet conveying conveyor 5, there is provided an arm relief space 27 through which the tip of the rotary arm 13 can pass when the rotary arm 13 rotates.

  The arm rotary shaft 12 is provided with auxiliary rotary arms 28 on both sides in the axial direction with the rotary arm 13 interposed therebetween. The auxiliary rotary arm 28 is fixed to the arm rotation shaft 12 so as to be in phase with the rotary arm 13. The auxiliary rotary arm 28 prevents the left and right ends of the corrugated cardboard sheet 3 from dropping down when the rotary arm 13 scoops up the left and right central part of the corrugated cardboard sheet 3.

  An arm driving motor 29 that rotates the arm rotating shaft 12 is connected to the arm rotating shaft 12. The arm drive motor 29 is preferably a servo motor in order to accurately perform instantaneous acceleration and deceleration of the arm rotating shaft 12. The servo motor is an electric motor that incorporates a sensor that detects the rotation angle of the motor and performs feedback control based on the difference between the rotation angle of the motor detected by the sensor and the target angle.

  A roller driving motor 30 that rotates the roller shaft 22 is connected to the roller shaft 22 of the sheet discharge driving roller 14. The roller drive motor 30 may use a servo motor, or may use a general-purpose electric motor that does not include a sensor that detects the rotation angle of the motor. The roller shaft 24 of the second sheet discharge drive roller 15 is connected to the roller shaft 22 of the sheet discharge drive roller 14 via a transmission belt 31. Thus, when the sheet discharge driving roller 14 rotates, the rotation of the sheet discharge drive roller 14 is input to the second sheet discharge drive roller 15 via the transmission belt 31, and the second sheet discharge drive roller 15 is driven to discharge the sheet. It rotates together with the roller 14.

  The arm rotation shaft 12, the sheet discharge driving roller 14, and the second sheet discharge driving roller 15 are supported by a portal frame 33 attached to the conveyor frame 32 of the sheet conveying conveyor 5. The portal frame 33 includes a pair of side plates 34 disposed on the left and right sides of the sheet conveying conveyor 5, and an upper stay 35 and a lower stay 36 that connect the side plates 34 to each other. The left and right ends of the upper stay 35 are fixed to a pair of left and right side plates 34, respectively, and the left and right ends of the lower stay 36 are also fixed to a pair of left and right side plates 34, respectively. The pair of left and right side plates 34 are respectively fixed to the left and right conveyor frames 32 of the sheet conveying conveyor 5 by connecting means such as bolts.

  The upper stay 35 is provided with a bearing bracket 37 that rotatably supports the sheet discharge driving roller 14 and a bearing bracket 38 that rotatably supports the second sheet discharge driving roller 15. The guide bar 26 is also attached to the upper stay 35. The lower stay 36 is provided with a bearing bracket 39 that rotatably supports the arm rotation shaft 12. As described above, the lower stay 36 that supports the arm rotation shaft 12 is provided separately from the upper stay 35 that supports the sheet discharge driving roller 14, so that it does not interfere with the corrugated cardboard sheet 3 to be removed from the sheet conveying conveyor 5. The arm rotation shaft 12 can be supported.

  As shown in FIG. 6, the sheet conveying conveyor 5 has the rear end of the corrugated cardboard sheet 3 being conveyed at a position directly below or upstream of the arm front end roller 18 when the rotary arm 13 is in the standby position. A photoelectric sensor 40 for detection is provided. Further, in the vicinity of the second sheet discharge driving roller 15, when the cardboard sheet 3 is transferred from the sheet discharge driving roller 14 to the second sheet discharge driving roller 15, a second end for detecting the front end in the traveling direction of the cardboard sheet 3 is detected. The photoelectric sensor 41 is provided.

  As shown in FIGS. 2 and 3, the sheet conveying conveyor 5 is provided with a removal sheet accommodating portion 16 on the upstream side of the position of the rotary arm 13. The removal sheet storage unit 16 includes a sheet receiving base 42 disposed above the conveyance belt 11 with a gap through which the cardboard sheet 3 being conveyed by the sheet conveyance conveyor 5 passes, and a front end in the traveling direction of the removed cardboard sheet 3. The cushion member 43 is received by buffering. In the figure, the cushion member 43 is a planar member formed of cloth. The upper end of the cushion member 43 is connected to a cushion support bracket 44 attached to the upper stay 35, and the lower end of the cushion member 43 is connected to the seat cradle 42.

  Next, a usage example of the sheet removing apparatus 1 will be described.

  As shown in FIG. 1, the sheet conveying conveyor 5 sequentially receives and conveys a sheet of corrugated cardboard sheets 3 continuously supplied from the upstream printing press 2 onto a conveying belt 10, and downstream (for example, It is discharged to a die cutting device (not shown). The defect detection device 4 determines the quality of the corrugated cardboard sheet 3 (for example, the quality of printing or the quality of the grooving position).

  When no defect is detected by the defect detection device 4, as shown in FIG. 6, as shown in FIG. 6, the rotary arm is set at a standby position where both the rotationally symmetric rotary arms 13 are retracted upward from the conveyance belt 11 of the sheet conveyance conveyor 5. 13 is held. At this time, the corrugated board sheet 3 being conveyed by the sheet conveying conveyor 5 is transferred from the inclined conveyor section 5b to the horizontal conveyor section 5c and is conveyed downstream as it is.

  When the defective cardboard sheet 3 is detected by the defect detection device 4, the control unit (not shown) of the sheet removal device 1 tracks the position of the cardboard sheet 3. This tracking can be performed, for example, by providing a speed sensor (not shown) for detecting the conveying speed of the sheet conveying conveyor 5 and integrating the outputs of the speed sensor.

  When the rear end of the defective corrugated cardboard sheet 3 passes just below the arm tip roller 18 of the rotary arm 13 on the upstream side in the sheet conveying direction, the rotary arm 13 starts to rotate. The timing at which the rotary arm 13 starts rotating is determined by the tracking of the defective cardboard sheet 3 conveyed from the defect detection device 4 toward the sheet removal device 1 and the photoelectric sensor 40 that detects the rear end of the cardboard sheet 3. And based on the signal.

  Thereafter, as shown in FIGS. 7 and 8, the rotary arm 13 scoops up the front sheet through the front and rear gaps between the cardboard sheets 3 being conveyed by the sheet conveying conveyor 5. Specifically, the front end of the rotary arm 13 enters the front and rear gaps between the rear end of the defective corrugated cardboard sheet 3 and the front end of the corrugated cardboard sheet 3 subsequent thereto, and then the same direction as the sheet conveying direction. The rotational speed is accelerated while moving to, and the lower surface of the rear end portion of the defective cardboard sheet 3 is scooped up. When the rotary arm 13 scoops up the rear end portion of the defective cardboard sheet 3, the upper surface of the defective cardboard sheet 3 contacts the sheet discharge driving roller 14. At this time, the defective cardboard sheet 3 is sandwiched between the sheet discharge driving roller 14 and the arm tip roller 18. At this position, the rotary arm 13 stops.

  Here, when scooping up the defective corrugated cardboard sheet 3 with the rotary arm 13, the sheet discharge driving roller 14 and the second sheet discharge driving roller 15 preliminarily contact the corrugated cardboard sheet 3 with the sheet conveying direction of the sheet conveying conveyor 5 (in the drawing). It is rotated so as to feed in the opposite direction (to the left in the figure). The rotation speeds of the sheet discharge driving roller 14 and the second sheet discharge driving roller 15 are higher than the sheet conveying speed of the sheet conveying conveyor 5 (for example, 200 to 300% of the sheet conveying speed of the sheet conveying conveyor 5). The size is set so that the cardboard sheet 3 is fed out. The sheet discharge drive roller 14 and the second sheet discharge drive roller 15 may be rotated only when the rotary arm 13 performs the operation of scooping up the corrugated cardboard sheet 3. Whether the rotary arm 13 performs the operation of scooping up the corrugated cardboard sheet 3 or not. Regardless of the case, it may be always rotated.

  As shown in FIGS. 8 and 9, when the upper surface of the corrugated cardboard sheet 3 comes into contact with the sheet discharge driving roller 14, the corrugated cardboard sheet 3 is opposite to the sheet conveying direction of the sheet conveying conveyor 5 by the rotation of the sheet discharging drive roller 14. Sent out in the direction. At this time, the arm tip roller 18 that is in contact with the lower surface of the cardboard sheet 3 rolls while supporting the lower surface of the cardboard sheet 3. Further, a gap larger than the thickness of the cardboard sheet 3 is formed between the second sheet discharge driving roller 15 and the arm tip roller 18 below the second sheet discharge driving roller 15.

  As shown in FIG. 10, when the defective cardboard sheet 3 is transferred from the sheet discharge drive roller 14 to the second sheet discharge drive roller 15, the second photoelectric sensor 41 detects the front end of the cardboard sheet 3 in the traveling direction. To do. At this time, the rotary arm 13 rotates in a direction in which the distance between the second sheet discharge driving roller 15 and the arm tip roller 18 below the second sheet discharge driving roller 15 is reduced. As a result, the defective corrugated cardboard sheet 3 is sandwiched between the second sheet discharge driving roller 15 and the arm tip roller 18 below the second sheet discharge driving roller 15.

  Then, as shown in FIG. 11, the defective corrugated cardboard sheet 3 is further fed out by the rotation of the second sheet discharge driving roller 15 and is accommodated in the removal sheet accommodating portion 16 shown in FIG. As shown in FIG. 12, after the second photoelectric sensor 41 detects that the rear end of the corrugated cardboard sheet 3 has passed the position of the second photoelectric sensor 41, the rotary arm 13 waits as shown in FIG. Rotate to position and stop.

  The sheet removing device 1 scoops up a corrugated sheet 3 being conveyed by the sheet conveying conveyor 5 with a rotary arm 13 provided above the sheet conveying conveyor 5 and brings it into contact with a sheet discharge driving roller 14. Since the sheet is conveyed and removed in the direction opposite to the sheet conveying direction of the sheet conveying conveyor 5, the sheet is shorter than the conventional sheet removing apparatus that sends the cardboard sheet 3 in the same direction as the sheet conveying direction of the sheet conveying conveyor 5 and removes it. It is possible to introduce it into the transfer line.

  In addition, the sheet removing apparatus 1 can be introduced in a form in which a member such as a rotary arm 13 or the like is added above the existing sheet conveying conveyor 5 without greatly modifying the existing sheet conveying conveyor 5. It is possible to reduce the introduction cost of the removal device 1.

  Further, since the sheet removing apparatus 1 uses a U-shaped rotary arm 13 that is recessed backward in the rotation direction, the arm tip roller 18 is brought into contact with the lower surface of the cardboard sheet 3 to scoop up the cardboard sheet 3. The front edge 21 in the rotational direction of the rotary arm 13 is unlikely to interfere with the rear end portion of the cardboard sheet 3. Therefore, it is possible to smoothly scoop up the cardboard sheet 3.

  Further, the sheet removing apparatus 1 can scoop up the corrugated cardboard sheet 3 by alternately using a pair of rotationally symmetric rotary arms 13 of 180 degrees, so that a plurality of corrugated cardboard sheets 3 conveyed from the upstream side can be continuously connected. Can be removed.

  In addition, the sheet removing apparatus 1 is configured such that the corrugated sheet 3 is transferred from between the one rotary arm 13 and the sheet discharge driving roller 14 to between the other rotary arm 13 and the second sheet discharge driving roller 15. Since the corrugated sheet 3 is guided at two positions separated in the traveling direction of the corrugated cardboard sheet 3, the traveling direction of the corrugated cardboard sheet 3 when the corrugated sheet 3 is fed by the sheet discharge driving roller 14 is stable.

  In the embodiment described above, an example in which the defective cardboard sheet 3 is removed by the sheet removing apparatus 1 has been described. However, the sheet removing apparatus 1 may also remove the corrugated cardboard sheet 3 other than defective products from the sheet conveying conveyor 5. Is possible. For example, it is possible to install an operation switch (for example, a push button) for removing a sheet and remove one cardboard sheet 3 from the sheet conveying conveyor 5 when the operator operates the switch. . Thereby, it becomes possible to remove the corrugated cardboard sheet 3 without stopping the sheet conveying conveyor 5 and to visually inspect the printing of the corrugated cardboard sheet 3 and the like.

  In the above-described embodiment, the example in which the sheet removing device 1 is installed on the downstream side of the printing machine 2 for the corrugated cardboard sheet 3 has been described. However, the sheet removing device of the present invention can be installed in other locations. It is. For example, in a corrugating machine that manufactures corrugated cardboard sheets, a wide continuous corrugated cardboard sheet manufactured through a single facer and double facer is cut into multiple strips with a slitter along the flow direction, and then cut with a cutter in the sheet width direction. Then, the corrugated cardboard sheets are stacked and discharged by a stacker. The apparatus may be installed as a device for removing defective corrugated cardboard sheets 3 between the corrugating machine and the stacker.

  Moreover, in the said embodiment, although the corrugated cardboard sheet 3 was mentioned as an example as a sheet | seat removed with the sheet | seat removal apparatus 1, it is also possible to remove other sheets.

DESCRIPTION OF SYMBOLS 1 Sheet removal apparatus 3 Corrugated sheet 5 Sheet conveyance conveyor 12 Arm rotating shaft 13 Rotary arm 14 Sheet discharge drive roller 15 Second sheet discharge drive roller 18 Arm tip roller

Claims (4)

An arm rotation shaft (12) disposed above the sheet transport conveyor (5) for transporting the sheet (3) in a state where there is a gap between the front and rear sheets (3);
The front sheet (3) is scooped up through the gap between the sheets (3) being conveyed by the sheet conveying conveyor (5), which is provided to extend radially outward from the arm rotation shaft (12). A rotary arm (13) that rotates integrally with the arm rotation shaft (12),
An arm tip roller (18) provided at the tip of the rotary arm (13) so as to come into contact with the lower surface of the sheet (3) when scooping up the sheet (3) with the rotary arm (13);
Wherein disposed above the sheet conveyor so that the upper surface of the sheet that has been picked up by the rotary arm (13) (3) is in contact (5), said sheet conveying said sheet (3) in contact is the scooped A sheet discharge driving roller (14) that rotates so as to feed in a direction opposite to the sheet conveying direction of the conveyor (5);
A sheet removing apparatus.   The sheet removing apparatus according to claim 1, wherein the rotary arm (13) is formed in a U shape that is recessed backward in the rotation direction.   The sheet removing apparatus according to claim 1 or 2, wherein at least a pair of the rotary arms (13) are provided so as to be 180 degrees rotationally symmetric about the arm rotation axis (12).   A second sheet that rotates in the same direction as the sheet discharge drive roller (14) at a position away from the sheet discharge drive roller (14) in the forward direction of the sheet fed by the sheet discharge drive roller (14). A discharge drive roller (15) is provided, and between the rotary arm (13) of the pair of rotationally symmetric rotary arms (13) and between the sheet discharge drive roller (14), the other rotary arm (13) The sheet removing apparatus according to claim 3, wherein the sheet (3) is transferred between the second sheet discharge driving rollers (15).

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