JP4906623B2 - Sheet feeding method and sheet feeding apparatus. - Google Patents

Description

  The present invention relates to a sheet feeding method for sheet-like workpieces such as cardboard and a sheet feeding device for sheet-like workpieces.

  A sheet-like work printing device such as a corrugated cardboard is a sheet-feeding device that feeds the lowermost sheet-like workpiece of the stacked sheet-like workpieces to a feed roller, a feed roller that sends the sheet-like workpiece to the printing unit, and a sheet-like workpiece And a printing unit that prints on the workpiece. The printing unit accurately prints at a predetermined position of the sheet-like workpiece and performs a printing process at a high speed. For this reason, the sheet-like work sheet feeding device is required to quickly send the sheet-like work to the printing unit side from a preset reference position. The sheet-like workpiece has various sizes and various different materials depending on the application.

  2. Description of the Related Art Conventionally, a sheet-like workpiece (corrugated cardboard) sheet feeding device includes a plurality of sheet feeding rollers for feeding a lowermost sheet-like workpiece among the stacked sheet-like workpieces to a printing unit, and a protrusion with respect to the plurality of sheet feeding rollers. Front that forms a grate that adjusts the contact and separation between the paper feed roller and the lowermost sheet-like workpiece by adjusting the amount of movement, and a gate for sending only the lowermost sheet-like workpiece to the printing unit side With gauges.

  Here, the gate is a gap formed at the lower end of the front gauge. If this gate (gap) is larger than the thickness of the sheet-like workpiece, the sheet-like workpiece is fed from the paper feed roller side to the printing unit side. If the gate (gap) is smaller than the thickness of the sheet-like workpiece, the sheet-like workpiece is not sent out from the paper feed roller side to the printing unit side.

In Patent Document 1, an outer periphery of the feed roller is provided with an abutting portion that can contact the lowermost paperboard and a notch portion that cannot contact the lowermost paperboard, and sucks the paperboard stacked by the vacuum portion However, there is disclosed a paper feeding device that sequentially carries out the paper from the lowermost paperboard of the laminated paperboard to the side through the gate gap by rotating the feed roller (claim 1). In Patent Document 2, a weight support member having a cross-section arc-shaped portion that temporarily holds a front end on the feeding side of a stacked corrugated cardboard sheet and transfers it to a discharging means on a front guide (front gauge) of a sheet feeding hopper section. Is disclosed (claim 1). Patent Document 3 discloses a corrugated sheet provided with an auxiliary sheet feeding device that assists sheet feeding by pressing the corrugated sheet toward the downstream side only for a predetermined period immediately after the start of sheet feeding on the rear end side of the sheet. Is disclosed (claim 1). That is, the conventional sheet-like workpiece sheet feeding device is provided with a notch on the outer periphery of the sheet feeding roller in order to intermittently send the lowermost sheet-like workpiece to the printing unit side (Patent Document 1). In order to reduce the stacking weight applied to the lowermost sheet-like workpiece, a weight support member (front stopper) is arranged (Patent Document 2), or in order to push out the lowermost sheet-like workpiece, a predetermined immediately after the start of paper feeding An auxiliary sheet feeding device (back stopper) that assists sheet feeding by pressing the sheet-like workpiece toward the downstream side only for a period is provided (Patent Document 3). In addition, a supply device is disclosed in which a plurality of sheet-like works (corrugated cardboard sheets) are erected and aligned, and dropped one by one to a corrugated cardboard box assembly device (Patent Document 4).
JP-A-9-156785 JP 2000-191153 A JP 2002-362761 A Japanese Patent No. 3810021

  However, in the conventional sheet-like workpiece feeding device, it is possible to prevent a problem that the lowermost sheet-like workpiece cannot be sent out from the gate to the printing unit side or a paper jam caused by sending out a plurality of sheet-like workpieces to the printing unit side. If the lowermost sheet-like workpiece is not accurately set at the preset reference position, the reference position of the lowermost sheet-like workpiece and the traveling direction of the lowermost sheet-like workpiece can be There is a problem that the printing position shift is caused by the shift amount from the leading edge (start position) (Patent Documents 1 to 3). In the case of a supply device that drops and supplies a sheet-like workpiece (corrugated cardboard sheet), when the sheet-like workpiece falls, the supply speed of the sheet-like workpiece is irregularly contacted with the supply device or other sheet-like workpiece Is not constant, and the posture of the sheet-like workpiece is not stable, so that it is not realistic to supply the printing unit that requires positional accuracy (Patent Document 4).

  In general, in a sheet-like workpiece feeding device, the lower end on the upstream side of a front gauge that forms a gate for feeding only the lowermost sheet-like workpiece to the printing unit side is set as a preset reference position. Here, the upstream side refers to the side opposite to the traveling direction of the sheet-like workpiece, and the downstream side refers to the side in the traveling direction of the sheet-like workpiece. Generally, in a sheet feeding device for sheet-like workpieces such as corrugated cardboard sheets, the stacked sheet-like workpieces are set by pressing against the upstream surface of the front gauge. Each sheet-like workpiece descends along the upstream side of the front gauge as the paper feed proceeds, but the corrugated sheet contact surface of the front gauge is inclined toward the direction of travel from the middle, so each sheet-like workpiece is inclined. However, due to the friction between the sheet-like workpieces and the weight load of the sheet-like workpieces stacked on top of each other, there is a gap between the leading edge of the sheet-like workpiece in the traveling direction and the upstream side of the front gauge. . This gap tends to be reduced by the frictional force generated between the lowermost sheet-like workpiece and the sheet-like workpiece laminated thereon when the lowermost sheet-like workpiece is fed from the gate to the printing unit side. Is not constant. Also, even if the tip of the lowermost sheet-shaped workpiece among the stacked sheet-shaped workpieces is accurately aligned with the reference position in advance, the sheet-shaped workpiece to be fed next will be Since it moves by the reaction when leaving the stopper, the position of the sheet-like workpiece that is the next lowermost layer is not constant. When the tip of the lowermost sheet-like workpiece is displaced from the reference position, the lower end of the front gauge, which is the reference position of the lowermost sheet-like workpiece, and the leading edge (start position) of the lowermost sheet-like workpiece in the traveling direction There is a problem that the printing position shift occurs by the amount of the shift (Patent Documents 1 to 3).

  Here, even in the conventional sheet feeding device, an attempt is made to align the advancing side end face at a certain position when the sheet-like workpiece is sent out each time. For example, in a paper feed device having a grate that adjusts the contact amount between the paper feed roller and the lowermost sheet-like workpiece by adjusting the amount of protrusion with respect to a plurality of paper feed rollers by the raising and lowering movement, Using the motion, the sheet-like workpiece is moved up and down to bring the sheet-like workpiece into contact with the rotating paper feed roller so that the advancing side end face is aligned at a fixed position each time the sheet-like workpiece is delivered. Operation is possible on a trial basis. However, it is mechanically difficult to take the timing of the operation of the great and the paper feed roller, and although there are some effects in low speed operation such as test operation, the actual situation is that it is not effective in high speed operation. In addition, due to the rotation driving of the sheet feeding roller, there is a tendency that the leading end of the sheet-like workpiece collides with the front gauge and damages the leading end of the sheet-like workpiece. In addition, it is difficult to control the rotational driving force of the paper feed roller in the conventional mechanical (mechanical control) paper feeding device, and even in the electrical (electric control) paper feeding device, the rotation angle of the paper feeding roller is not controlled. Control was not possible.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet-like workpiece feeding method and a sheet-like workpiece that are accurately aligned with a preset reference position without damaging the lowermost sheet-like workpiece among the laminated sheet-like workpieces. It is to provide a sheet feeding device.

The sheet-like workpiece sheet feeding device according to the present invention includes a plurality of sheet feeding rollers for feeding the lowermost sheet-like workpiece among the stacked sheet-like workpieces to the printing unit side, and a protruding amount with respect to the plurality of sheet feeding rollers. A grate that adjusts the contact / separation between the sheet feed roller and the lowermost sheet-like workpiece by adjusting by raising and lowering, a front gauge that forms a gate for sending the lowermost sheet-like workpiece to the printing unit side, and and a gate plate to open and close by the lifting movement of the gate, the gate plate is disposed below or above the gate, until said intermediate position Great that the feed roller is slightly protruded from the Great from is lowered, the progress side tip of the lowermost sheet-shaped workpiece by rotating the feed roller to the gate plate closed the gate Is contact, then causes further lowered the Great to the lowest position of the Great said feed roller once stops the sheet feed roller protrudes to the set height, the progress of the lowermost sheet-shaped work to open the gate The contact between the side tip and the gate plate is released, and then the sheet feeding roller is rotated to feed the sheet-like workpiece .

According to the present invention, it is possible to accurately align with the position of the front gauge, which is a preset reference position, without damaging the leading edge of the lowermost sheet-like workpiece.

The sheet-like workpiece feeding method of the present invention includes a plurality of sheet feeding rollers for feeding a lowermost sheet-like workpiece among the stacked sheet-like workpieces to the printing unit side, and a protruding amount with respect to the plurality of sheet feeding rollers. Great to adjust the contact and separation between the paper feed roller and the lowermost sheet-like workpiece by adjusting by raising and lowering, a front gauge that forms a gate for sending only the lowermost sheet-like workpiece to the printing unit side, using the feeding device of the sheet-like workpiece having a gate plate to open and close by the lifting and lowering the gate, it is lowered the Great to an intermediate position where the feed roller is slightly protruded from the Great from abut progression side tip of the lowermost sheet-shaped workpiece by rotating the feed roller to the gate plate in the state of closing the gate, then, before Causes further lowered the Great once stops the sheet feed roller to the lowest position in Great projecting to the paper feed roller is set high, the gate plate to the advancing side tip of the lowermost sheet-shaped work to open the gate releasing the contact between, then by rotating the feed roller, characterized in that feeding the sheet-like workpiece.

  According to the present invention, the lowermost sheet-like workpiece is moved by the sheet feeding roller by rotating the sheet feeding roller after the sheet is lowered to an intermediate position where the sheet feeding roller slightly protrudes from the grating. Only the driving force necessary to bring the sheet plate into contact with the gate plate is obtained, and when the lowermost sheet-like workpiece is brought into contact with the gate plate, the sheet feeding roller temporarily stops. Excessive force is not applied to the workpiece, and alignment can be performed without damaging the advancing front end of the lowermost sheet-like workpiece and the contact surface with the paper feed roller. Further, at the lowest descending position of the great where the feed roller protrudes from the great to the set height, the gate plate opens the gate and releases the contact between the leading edge of the lowermost sheet-like workpiece and the gate plate, Next, since the sheet-like workpiece is sent out by rotating the paper feed roller, an excessive force is not applied to the lowermost sheet-like workpiece to be sent out, and the leading end of the lowermost sheet-like workpiece or the entire deformation is generated. Without passing through the gate.

In the sheet-like workpiece feeding method according to the present invention, the plurality of feeding rollers are rotated by a small angle by an independent driving unit for each drive shaft, and the leading end of the lowermost sheet-like workpiece is closed at the gate. It is preferable to contact the gate plate. In the sheet-like workpiece feeding device according to the present invention, the plurality of feeding rollers are provided with independent driving motors for each drive shaft, and the feeding roller is rotated by a small angle so that the lowermost sheet-like workpiece is provided. It is preferable that the advancing side tip is brought into contact with the gate plate with the gate closed . Here, rotating the paper feed roller by a minute angle refers to rotating the paper feed roller by a minute angle by phase-controlling the rotation angle of a drive motor that is a driving means of the paper feed roller. Rotating the paper roller at a rotation angle of less than 10 degrees is defined as minute angle rotation. However, the minute angle rotation amount of each paper feed roller is not necessarily equal. After the leading edge of the lowermost sheet-like workpiece is brought into contact with the gate plate, the feeding roller and the lowermost sheet-like workpiece slip slightly, and the leading edge of the lowermost sheet-like workpiece is not damaged. Therefore, in order to prevent an unnecessarily large sheet driving force from being applied, when the drive shaft is a four-axis feed roller, the rotation amount of the two-axis feed roller is set to the other two-axis feed roller. You may make it make it less than the rotation amount. In other words, only the initial drive for overcoming the static friction may be a 4-axis drive, and once the drive is started, the drive may be switched to a 2-axis drive.

  By providing a drive motor that is an independent drive means for each drive shaft of the plurality of paper feed rollers, the plurality of paper feed rollers can be independently controlled in rotation angle, and the lowermost sheet The sheet feed roller can be rotated by a small angle by a peripheral length corresponding to the positional deviation of the leading end of the sheet-shaped workpiece, so that the sheet-shaped workpiece on the bottom layer can be brought into contact with the gate plate. There is no waste in rotation. In addition, by stopping rotation in order from the paper feed roller that has finished sending out the lowermost sheet-like workpiece, only the lowermost sheet-like workpiece is reliably sent out. There is no worry of paper jams due to sending out.

Sheet feeder of a sheet-like work of the present invention, the gate plate is preferably a sensor for detecting the abutment of the sheet-shaped workpiece is disposed. Sensor disposed on the gate plate detects the contact of the lowermost sheet-shaped workpiece, and by sending the contact sensing signal to the control circuit, the progress side tip of the lowermost sheet-shaped workpiece is the gate plate At the same time, the control circuit sends a stop signal to the paper feed roller to forcibly stop the paper feed roller. The sensor is preferably a contact sensor such as a microswitch or a pressure sensor, but a non-contact sensor can also be used.

Paper sheet workpiece of the present invention, the standby time of the sheet feed roller after completing the transmission of the lowermost sheet-shaped workpiece to the start of the delivery of the next sheet-like work, the paper feed roller It is preferable that the lowermost sheet-like work is brought into contact with the gate plate with the gate closed . By effectively utilizing the waiting time, it can improve the tact time of the sheet feeding device of the sheet workpiece.

According to the sheet-like workpiece feeding method of the present invention, the sheet feeding roller is rotated by rotating the sheet feeding roller after the sheet feeding roller is lowered to an intermediate position where the sheet feeding roller slightly protrudes from the grating. Only the driving force required to bring the lowermost sheet-like workpiece into contact with the gate plate can be obtained in step. When the lowermost sheet-like workpiece is in contact with the gate plate, the paper feed roller temporarily stops. Therefore, an excessive force is not applied to the lowermost sheet-like workpiece, and the alignment can be performed without damaging the leading end of the lowermost sheet-like workpiece and the contact surface with the paper feed roller. The gate plate opens the gate to release the contact between the leading edge of the lowermost sheet-like workpiece and the gate plate at the lowest position of the great where the feed roller protrudes from the great to the set height, Next, since the sheet-like workpiece is sent out by rotating the paper feed roller, an excessive force is not applied to the lowermost sheet-like workpiece to be sent out, and the leading end of the lowermost sheet-like workpiece or the entire deformation is generated. Without passing through the gate. Therefore, it is possible to accurately align with the position of the front gauge which is a preset reference position without damaging the tip of the lowermost sheet-like workpiece. Further, according to the paper feeding device of the sheet-like work of the present invention, the front gauge without lifting movement, a gate plate to open and close by the lifting movement of the gate, by rotating the feed roller after the progress side tip of the lowermost sheet-shaped workpiece is brought into contact with the gate plate in the state of closing the gate, since it is configured to open the gate, without burdening the number of sheet-like workpieces which are stacked, The tip of the lowermost sheet-like workpiece can be accurately aligned with the position of the front gauge, which is a preset reference position. Further, the gate plate, by being arranged on the lower side or upper side of the gate, the range of the lifting and lowering of the gate plate can be minimized.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Conventional example)
FIG. 10 is a side view schematically showing a conventional corrugated sheet feeding apparatus X1 and its operation. In the corrugated cardboard sheet feeding device X1 of the conventional example, the lowermost corrugated cardboard sheet n1 of the laminated corrugated cardboard sheets n (n1, n2, n3,...) Is arranged on the printing unit side by its frictional rotational force. The plurality of paper feed rollers K (Ka, Kb, Kc, Kd) that feed in the direction of the feed roller R1 and the amount of protrusion with respect to the plurality of paper feed rollers K are adjusted by their up-and-down movements, so that the paper feed roller K and the lowermost layer Greater Q for adjusting contact / separation with the sheet-like workpiece n1, and the uppermost sheet feed roller K and the upper end thereof are set at the same height, and the lowermost corrugated cardboard sheet n1 is arranged between the great Q and the feed roller R1. And a bridge plate E that bridges from the paper feed roller K side to the feed roller R1 side, and the bridge plate E sends out only the lowermost corrugated cardboard sheet n1 to the printing unit side. Greater than the thickness d of the one sheet ball seat comprises a front gage Fk1 to form small gate (gap) i than cardboard sheets two sheets of thickness 2d. The conventional front gauge Fk1 may be moved up and down by a driving means or the like when adjusting the setting conditions, but is usually fixed at a set position. The gate (gap) i is a height difference i between the lower end of the front gauge Fk1 and the upper end of the bridge plate E (FIG. 10A). On the side opposite to the front gauge Fk1 side in the direction of travel a of the cardboard sheet n, a back stopper B is disposed, and the rear ends of the cardboard sheets n2, n3,. The lowermost corrugated cardboard sheet n1 and the rear ends of the corrugated cardboard sheets n2, n3,... Above are separated to reduce the weight load on the lowermost corrugated cardboard sheet n1. A suction box S is disposed below the great Q, and the lowermost corrugated cardboard sheet n1 is drawn from the back stopper B to the great Q side by air suction. The feed roller R1 rotates in synchronization with the belt roller R2 that drives the conveyance belt U, conveys the corrugated cardboard sheet n1 by the conveyance belt U, and sends it to a printing unit (not shown) in the direction of travel a.

  Next, the sheet feeding method of the corrugated sheet feeding apparatus X1 of the conventional example will be described below. FIG. 11 is a timing chart schematically showing the operation of the corrugated cardboard sheet feeding apparatus X1 of the conventional example. FIG. 11A shows a timing chart when the vertical axis represents the rotation speed V of the plurality of paper feed rollers K and the horizontal axis represents the apparatus phase θ. FIG. 11B shows a timing chart when the vertical axis is the elevating position L of the great Q and the horizontal axis is the apparatus phase θ. FIG. 11C shows a timing chart when the vertical axis is the gate (gap) i and the horizontal axis is the apparatus phase θ. Here, among the laminated corrugated cardboard sheets n (n1, n2, n3,...), The lowermost corrugated cardboard sheet n1 is initially a reference position in which the tip in the traveling direction a is set in advance. A description will be given of a case where the front gauge Fk1 is disposed on the PP line at the lower end on the upstream side (the lower end on the side of the laminated cardboard sheets) (FIG. 10A). Here, the upstream side refers to the opposite side of the direction of travel a of the cardboard sheet n, and the downstream side refers to the side of the direction of travel a of the cardboard sheet n.

  By rotating the plurality of paper feed rollers K in contact with the lowermost corrugated cardboard sheet n1, the lowermost corrugated cardboard sheet n1 is fed in the direction of travel a by the rotational frictional force and accelerated to a predetermined level. Is conveyed to the sheet feeding unit side by the feed roller R1 and the conveyor belt U (FIG. 10B). The great Q is lowered in accordance with the acceleration of the rotational speed V of the plurality of paper feed rollers K, and the great Q is at the lowest lowered position −La when the plurality of paper feed rollers K is at the rotational speed Vk. The gate (gap) i is always a gap through which one cardboard sheet (thickness d) can pass, and is a gap through which two cardboard sheets (thickness 2d) cannot pass (FIG. 11C). ). After the lowermost corrugated cardboard sheet n1 is fed from the front gauge Fk1 toward the traveling direction a, the great Q rises to the highest ascending position La which is higher than the upper ends of the plurality of paper feed rollers K, and the upper end of the great Q And the lower end of the front gauge Fk1 is a gap through which one corrugated cardboard sheet (thickness d) cannot pass, so the front end of the corrugated cardboard sheet n2 to be sent next in the traveling direction a is the corrugated cardboard sheet of the front gauge Fk1. It contacts the n-side surface (FIG. 10C). Then, the sheet feeding roller K decelerates its rotation, the great Q is lowered, and the corrugated cardboard sheet n2 to be delivered next is attracted from the back stopper B to the great Q side by the air suction of the suction box S, and the back Due to the recoil from the stopper B, the tip in the direction of travel a is separated from the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position, by a gap w (is displaced). (FIG. 10 (d)). The gap w is an uncertain value because, for example, the reaction of the cardboard sheet n coming off the back stopper B is not constant.

  In the conventional corrugated sheet feeding apparatus X1 and its feeding method, the corrugated sheets n (n1, n2, n3,...) Are stacked and set by pressing against the upstream side surface of the front gauge Fk1. As the paper feed proceeds, each cardboard sheet n1, n2, n3,... Descends along the upstream side surface of the front gauge Fk1, but the cardboard sheet contact surface of the front gauge Fk1 inclines toward the traveling direction a from the middle. Therefore, although each corrugated cardboard sheet n1, n2, n3,... Descends along its inclination, the progress of the corrugated cardboard sheet is caused by the friction between the corrugated cardboard sheets or the weight load of the corrugated cardboard sheets laminated thereon. A gap is opened between the front end side in the direction and the upstream side surface of the front gauge Fk1. For example, when the lowermost corrugated cardboard sheet n1 is fed to the feed roller R1, the next corrugated cardboard sheet n2 moves with a slight conveying force in the feeding direction due to the frictional force between the corrugated cardboard sheets (n1 and n2). However, the gap between the leading end side of the next corrugated cardboard sheet n2 and the upstream side surface of the front gauge Fk1 tends to be small. However, since the next corrugated cardboard sheet n2 has a larger frictional force with the upper corrugated cardboard sheet n3 (the contact area is large), the conveying force until it abuts against the front gauge Fk1 cannot be obtained. Further, since the load is reduced by the remaining number of the corrugated cardboard sheets, the conveying force is not constant. As the paper feed speed increases, the above-described conveying force further decreases. Therefore, the gap w between the upstream lower end of the front gauge Fk1, which is a preset reference position, and the front end side in the advancing direction of the corrugated cardboard sheet n is not constant, and positional deviation and positional variation occur.

  Then, even if the leading end of the corrugated cardboard sheet n2 to be sent next is aligned with the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position, the paper feed roller K In the state where the rotation is decelerated, the great Q is not lowered to the intermediate position Lc where the paper feed roller K slightly protrudes from the great Q (FIG. 11B), and in the state where the paper feed roller K starts to rotate. Since the great Q further descends, and the gap between the upper end of the great Q and the lower end of the front gauge Fk1 is becoming large enough to pass one cardboard sheet (thickness d), the traveling direction a of the corrugated cardboard sheet n2 Cannot be aligned with the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position. It is actually difficult to accurately align the first lowermost corrugated cardboard sheet n1 with the sheet feeding device X1 as described above.

(First embodiment)
FIG. 1A is a side view schematically illustrating a corrugated cardboard sheet feeding device according to a first embodiment of the present invention, and FIG. 1B is a diagram within a one-dot chain line circle in FIG. It is a partial enlarged view. The corrugated cardboard sheet feeding device Z1 of the present invention has a front gauge Fg1 that opens and closes a gate (gap) i for feeding only the lowermost sheet-like work (for example, n1) to the printing unit side by its up and down movement. Prepare. The gate (gap) i is the height difference i between the lower end of the front gauge Fg1 and the upper end of the bridging plate E, and coincides with the height difference h between the lower end of the front gauge Fg1 and the upper end of the paper feed roller K. (FIG. 1 (b)). The front gauge Fg1 is moved up and down by a drive motor Mf1, which is a driving means, and is moved up and down by bringing the front end of the sheet-like work into contact with the front gauge for each sheet work in the lowermost layer. In the conventional corrugated cardboard sheet feeding apparatus, there is a sheet feeding apparatus having a mechanism in which the front gauge moves up and down by the driving means or the like when adjusting the setting conditions. However, as in the present invention, the driving means (driving motor) Therefore, the sheet feeding device is not a mechanism that moves up and down by bringing the leading end of the sheet-like workpiece into contact with the front gauge for each sheet-like workpiece in the lowermost layer. Further, the drive motors Mka, Mkb, Mkc, Mkd, which are drive means for the plurality of paper feed rollers K (Ka, Kb, Kc, Kd) and the drive means (drive motor) Mq for the great Q are driven independently. . The other mechanism of the corrugated cardboard sheet feeding apparatus Z1 of the present invention is the same as that of the corrugated sheet feeding apparatus X1 of the conventional example.

  A paper feeding method according to the first embodiment of the present invention will be described below. FIG. 2 is a side view schematically showing a corrugated sheet feeding device and its operation according to the first embodiment of the present invention. FIG. 3 is a timing chart schematically showing the operation of the cardboard sheet feeding device according to the first embodiment of the present invention. FIG. 3A shows a timing chart when the vertical axis is the rotation speed V of the plurality of paper feed rollers K and the horizontal axis is the apparatus phase θ. FIG. 3B shows a timing chart when the vertical axis is the elevating position L of the great Q and the horizontal axis is the apparatus phase θ. FIG. 3C shows a timing chart when the vertical axis is the gate (gap) i and the horizontal axis is the device phase θ. The lowermost corrugated cardboard sheet n1 of the laminated corrugated cardboard sheets n (n1, n2, n3,...) Is a reference in which the leading end in the traveling direction a is set in advance, as in the alignment method described later. The position is accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fg1 (the lower end on the side of the laminated cardboard sheets) (FIG. 2 (a)).

  By rotating the plurality of paper feed rollers K in contact with the lowermost corrugated cardboard sheet n1, the lowermost corrugated cardboard sheet n1 is fed in the direction of travel a by the rotational frictional force and accelerated to a predetermined level. Is conveyed to the sheet feeding unit side by the feed roller R1 and the conveyor belt U (FIG. 2B). The great Q is at the lowest lowered position −La (FIG. 3B), the gate (gap) i is a gap through which one cardboard sheet (thickness d) can pass, and two cardboard sheets ( This is a gap through which the thickness 2d) cannot pass (FIG. 3C). After the lowermost corrugated cardboard sheet n1 is fed from the front gauge Fg1 to the feed roller R1 side in the traveling direction a, the plurality of paper feed rollers K decelerate the rotation. The plurality of paper feed rollers Ka, Kb, Kc, and Kd are provided with independent drive motors Mka, Mkb, Mkc, and Mkd for each drive shaft, and the paper feed rollers Kd to Kd that have finished sending the lowermost corrugated cardboard sheet n1. , Kc, Kb, Ka to stop the rotation in order, so that only the lowermost corrugated cardboard sheet n1 is surely sent out, so there is no fear of sending out a plurality of corrugated cardboard sheets to the printing unit side. Further, since the inclination of the rotation deceleration curve of the paper feed roller K can be arbitrarily adjusted, the inclination of the rotation deceleration curve can be relaxed as necessary. The plurality of paper feed rollers K decelerate the rotation, and the great Q rises to the highest rising position La that is higher than the upper ends of the plurality of paper feed rollers K, and the upper end of the great Q and the lower end of the front gauge Fg1 Since the gap is a gap through which one cardboard sheet (thickness d) cannot pass, the tip of the next corrugated cardboard sheet n2 in the traveling direction a contacts the upstream side surface of the front gauge Fg1 (FIG. 2C). ).

  Next, the front gauge Fg1 is lowered in the downward direction cd by a predetermined amount. Here, the predetermined amount is, for example, an amount corresponding to the increase amount (decrease amount) of the great Q. Then, the great Q descends, and the corrugated cardboard sheet n2 to be delivered next is attracted to the great Q side from the back stopper B by the air suction of the suction box S, and the reaction in the advancing direction a is caused by the recoil from the back stopper B. The tip in the direction is separated from the PP line at the lower end on the upstream side of the front gauge Fg1 which is a preset reference position by a gap w (is displaced) (FIG. 2 (d)). At this time, the gate (gap) i has a size in which one cardboard sheet (thickness d) cannot pass (FIG. 3C).

  Then, after the great Q is lowered to the intermediate position Lc where the paper feed roller K slightly protrudes from the great Q, the paper feed roller K rotates in contact with the lowermost corrugated cardboard sheet n2, so that the rotational friction Because of the force, the lowermost corrugated cardboard sheet n2 is fed out in the direction of travel a, and the gate (gap) i is so large that one corrugated cardboard sheet (thickness d) cannot pass through (FIG. 3 (c) )), The leading end of the corrugated cardboard sheet n2 is brought into contact with the upstream side surface of the front gauge Fg1, and the lowermost corrugated cardboard sheet n2 has a front gauge Fg1 whose leading end in the traveling direction a is a preset reference position. Is accurately positioned on the PP line at the lower end on the upstream side (FIG. 2 (e)). The plurality of paper feed rollers K (Ka, Kb, Kc, Kd) are provided with independent drive motors Mka, Mkb, Mkc, Mkd for each drive shaft, and the plurality of paper feed rollers K are independently controlled in rotation angle. The leading edge of the lowermost sheet-like workpiece can be rotated by rotating the plurality of feeding rollers K by a small angle by the circumferential length of the feeding roller K corresponding to the positional deviation of the leading edge of the lowermost corrugated cardboard sheet n2. Can be brought into contact with the upstream side surface of the front gauge Fg1, so there is no waste in the rotation of the plurality of paper feed rollers K. Although depending on the size of the cardboard sheet n, the rotation angle of the plurality of paper feed rollers K is usually less than 10 degrees.

  Then, the front gauge Fg1 rises upward by a predetermined amount and returns to the initial position (position shown in FIG. 2A) (FIG. 2F). Since the front gauge Fg1 returns to the initial position (the position shown in FIG. 2A), the gate (gap) i is a gap through which one cardboard sheet (thickness d) can pass, and two cardboard sheets. This is a gap through which (thickness 2d) cannot pass (FIG. 3C). The first lowermost corrugated cardboard sheet n1 is also accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fg1 in the same manner as the alignment method shown in FIGS. 2 (d) and 2 (e).

  According to the first embodiment of the present invention, the front end surface of the lowermost sheet-like workpiece (for example, n2) is brought into contact with the upstream side surface of the front gauge Fg1 by the paper feed roller K, and then the front gauge The front gauge Fg1 in which the tip of the lowermost sheet-like workpiece n is a preset reference position is opened by moving up and down Fg1 to open a gap through which only one cardboard sheet (thickness d) can pass through the gate i. Is positioned accurately on the PP line at the lower end of the upstream side. Further, the plurality of paper feed rollers K are rotated by a small angle by the circumferential length of the paper feed roller K corresponding to the position shift of the leading edge of the lowermost sheet-like workpiece (for example, n2), and the lowermost sheet-like workpiece is advanced. Since the leading end can be brought into contact with the upstream side surface of the front gauge Fg1, there is no waste in rotating the plurality of paper feed rollers K, and the leading end of the lowermost sheet-like workpiece contacts the upstream side surface of the front gauge Fg1. After the contact, the plurality of paper feed rollers K do not slip and rotate more than necessary, and the lowermost sheet-like work is not damaged.

(Second Embodiment)
FIG. 4A is a side view schematically showing a corrugated sheet feeding device Z2 according to the second embodiment of the present invention. FIG. 4B is a partially enlarged view within a one-dot chain line circle in FIG. In the corrugated sheet feeding device Z2 according to the second embodiment of the present invention, a gate plate G1 is provided immediately below the front gauge Fk1 at a position facing the front gauge Fk1. Further, a bridging plate E for transferring the lowermost sheet-like work (for example, n1) sent from the plurality of paper feed rollers K to the transport belt U is disposed between the paper feed roller K and the transport belt U, and the great Q It is installed on the lower side. The gate plate G1 is moved up and down by a drive motor Mg1 as drive means, and the gate (gap) i is opened and closed by the movement up and down, and is built in the bridge plate E (FIG. 4B). )). The gate plate G1 moves up and down for each lowermost sheet-like workpiece. The dimension of the thickness t of the lower end of the front gauge Fk1 and the thickness t of the upper end of the gate plate G1 are the same. The drive motors Mka, Mkb, Mkc, Mkd, which are the drive means for the gate plate G1, and the plurality of paper feed rollers K (Ka, Kb, Kc, Kd) and the drive means (drive motor) Mq for the great Q are independent of each other. To drive. The gate (gap) i is the smaller of the difference in height between the lower end of the front gauge Fk1 and the upper end of the bridge plate E, or the difference in height between the lower end of the front gauge Fk1 and the upper end of the gate plate G1. The gate i with the gap i and the gate plate G1 built in the bridge plate E coincides with the height difference h between the lower end of the front gauge Fk1 and the upper end of the paper feed roller K (FIG. 4B). )). A sensor J for detecting the contact of the lowermost sheet-like workpiece is disposed on the upstream side surface of the gate plate G1, and the control for controlling the driving means (driving motor) by the detection signal from the sensor J is provided. The circuit C is built in the bridge plate E (FIG. 4B).

  FIG. 5 is a side view schematically showing the paper feeding operation of the corrugated cardboard sheet feeding device Z2 of the second embodiment to which the present invention is applied. A paper feeding method according to the second embodiment of the present invention will be described below. FIG. 6 is a timing chart schematically showing the operation of the cardboard sheet feeding device Z2 of the present invention. FIG. 6A shows a timing chart when the vertical axis is the rotation speed V of the plurality of paper feed rollers K and the horizontal axis is the apparatus phase θ. FIG. 6B shows a timing chart when the vertical axis is the elevating position L of the great Q and the horizontal axis is the apparatus phase θ. FIG. 6C shows a timing chart when the vertical axis is the gate (gap) i and the horizontal axis is the apparatus phase θ. The lowermost corrugated cardboard sheet n1 of the laminated corrugated cardboard sheets n (n1, n2, n3,...) Is a reference in which the leading end in the traveling direction a is set in advance, as in the alignment method described later. The position is accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fk1, and the gate plate G1 is built in the bridge plate E (FIG. 5A).

  By rotating the plurality of paper feed rollers K in contact with the lowermost corrugated cardboard sheet n1, the lowermost corrugated cardboard sheet n1 is fed in the direction of travel a by the rotational frictional force and accelerated to a predetermined level. Is conveyed to the sheet feeding unit side by the feed roller R1 and the conveyor belt U (FIG. 5B). Great Q is at the lowest position −La (FIG. 6B), and gate (gap) i is a gap through which one cardboard sheet (thickness d) can pass, and two cardboard sheets. This is a gap through which (thickness 2d) cannot pass (FIG. 6C). Then, after sending the lowermost corrugated cardboard sheet n1 from the front gauge Fk1 toward the traveling direction a, the great Q rises to the highest ascent position La that is higher than the upper ends of the plurality of paper feed rollers K, and the great Q Since the gap between the upper end of the front gauge Fk1 and the lower end of the front gauge Fk1 is a gap through which one cardboard sheet (thickness d) cannot pass, the front end in the direction of travel a of the corrugated cardboard sheet n2 to be sent next is the front gauge Fk1. It contacts the upstream side surface (FIG. 5C).

  Next, the gate plate G1 moves upward by a predetermined amount. Here, the predetermined amount is, for example, an amount corresponding to the increase amount (decrease amount) of the great Q. The front gauge Fk1 and the gate plate G1 are in contact with each other, or even if there is a gap, the size of one cardboard sheet (thickness d) cannot pass. Then, the great Q descends to an intermediate position Lc where the paper feed roller K slightly protrudes from the great Q (FIG. 6B), and the next corrugated cardboard sheet n2 is fed back by the air suction of the suction box S. From the PP line at the lower end on the upstream side of the front gauge Fk1, the front end in the direction of travel a is pulled back from the stopper B toward the great Q side and moved away from the back stopper B, which is the preset reference position. It is separated by w (is displaced) (FIG. 5D).

  Then, the great Q is lowered to the lowest position -La (FIG. 6B), and the sheet feeding roller K rotates in a state of being in contact with the lowermost corrugated cardboard sheet n2. The corrugated cardboard sheet n2 is fed out in the direction of travel a, and its forward end is brought into contact with the upstream side surface of the gate plate G1. At this time, the gate i is closed (FIG. 6C). A sensor J that detects the contact of the lowermost corrugated cardboard sheet n2 is disposed on the upstream side surface of the gate plate G1 (FIG. 4B). The leading edge of the lowermost corrugated cardboard sheet n (n2) contacts the gate plate G1, and at the same time, the sensor J disposed on the gate plate G1 detects the contact of the lowermost corrugated cardboard sheet n2 and detects the contact. Is sent to the control circuit C, the control circuit C sends a stop signal to the drive motors Mka, Mkb, Mkc, Mkd, which are drive means for the paper feed rollers K (Ka, Kb, Kc, Kd). K (Ka, Kb, Kc, Kd) is forcibly stopped. The sensor J is preferably a contact sensor such as a microswitch or a pressure sensor, but a non-contact sensor can also be used.

  Then, the lowermost corrugated cardboard sheet n2 is accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fk, which is the reference position set in advance in the direction of travel a (FIG. 5 (e)). ). Since the gate plate G1 descends by a predetermined amount in the downward direction cd and returns to the initial position (position in FIG. 5A) built in the bridge plate E, the gate (gap) i is equivalent to one cardboard sheet. This is a gap through which (thickness d) can pass, and a gap through which two corrugated cardboard sheets (thickness 2d) cannot pass (FIG. 6C). The first lowermost corrugated cardboard sheet n1 is also accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fk1 in the same manner as the alignment method shown in FIGS. 5 (d) and 5 (e).

  According to the second embodiment of the present invention, the gate (gap) i is opened and closed by the raising / lowering of the gate (gap) i without raising / lowering the front gauge Fk1 that easily contacts a large number of stacked sheet-like works. A sensor J for detecting the contact of the lowermost corrugated cardboard sheet n2 is disposed on the upstream side surface of the gate plate G1, and the lowermost sheet-like workpiece (for example, n1) is provided by the paper feed roller K. ) Is in contact with the upstream side surface of the gate plate G1, and at the same time, the sensor J disposed on the gate plate G1 detects the contact of the lowermost corrugated cardboard sheet n2 and sends a contact detection signal to the control circuit C. For sending, the control circuit C sends a stop signal to the drive motors Mka, Mkb, Mkc, Mkd of the paper feed rollers K (Ka, Kb, Kc, Kd) to forcibly stop the paper feed rollers K. That. Then, by opening the gate i by raising and lowering the gate plate G1, the tip of the lowermost sheet-like work (for example, n1) in the direction of travel a is not applied to the stacked many sheet-like works. It is accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position.

(Third embodiment)
FIG. 7 is a side view schematically showing the corrugated sheet feeding device Z3 and its sheet feeding operation according to the third embodiment of the present invention. In the corrugated cardboard sheet feeding device Z3 according to the third embodiment of the present invention, the gate plate G2 is attached below the downstream side surface (the surface on the feed roller R1 side) of the front gauge Fk1. The position of the gate plate G2 is above the gate i (FIG. 7B). The gate plate G2 is moved up and down by a drive motor Mg2 that is a driving means, and the gate i is opened and closed by the lift and lowering operation, and is moved up and down for each sheet work in the lowermost layer. The gate (gap) i is the smaller of the difference in height between the lower end of the front gauge Fk1 and the upper end of the bridge plate E, or the difference in height between the lower end of the gate plate G2 and the upper end of the bridge plate E. The gate i with the gap i and the lower end of the gate plate G2 raised to a position higher than the lower end of the front gauge Fk1 has a height difference h between the lower end of the front gauge Fk1 and the upper end of the paper feed roller K. They match (FIG. 7 (b)).

  A paper feeding method according to the third embodiment of the present invention will be described below. The lowermost corrugated cardboard sheet n1 of the laminated corrugated cardboard sheets n (n1, n2, n3,...) Is a reference in which the leading end in the traveling direction a is set in advance, as in the alignment method described later. The gate plate G2 is in a raised state because the position is precisely positioned forward by the thickness t of the lower end of the front gauge Fk1 from the PP line on the lower end on the upstream side of the front gauge Fk1 (FIG. 8). (A)). By electrically or mechanically offsetting the position information ahead by the thickness t of the lower end of the front gauge Fk1, the lowermost corrugated cardboard sheet n1 is a reference position in which the leading end in the direction of travel a is set in advance. This is equivalent to accurate positioning on the PP line at the lower end on the upstream side of the front gauge Fk1.

  By rotating a plurality of paper feed rollers K in contact with the lowermost corrugated cardboard sheet n1, the lowermost corrugated cardboard sheet n1 is fed to the feed roller R1 side in the direction of travel a by the rotational friction force. Then, it is accelerated to a predetermined transport speed, and is transported to the paper feed unit side by the feed roller R1 and the transport belt U (FIG. 8B). After the lowermost corrugated cardboard sheet n1 is fed from the front gauge Fk1 toward the feed roller R1 in the traveling direction a, the great Q rises to a position higher than the upper ends of the plurality of paper feed rollers K, and the upper end of the great Q and the front Since the gap with the lower end of the gauge Fk1 is a gap through which one cardboard sheet (thickness d) cannot pass, the tip of the next cardboard sheet n2 to be sent in the direction of travel a contacts the upstream side surface of the front gauge Fk1. (FIG. 8 (c)).

  Next, the gate plate G2 is lowered in the downward direction cd by a predetermined amount. Here, the predetermined amount is, for example, an amount corresponding to the increase amount (decrease amount) of the great Q. Then, the great Q descends, and the corrugated cardboard sheet n2 to be delivered next is attracted to the great Q side from the back stopper B by the air suction of the suction box S, and the reaction in the advancing direction a is caused by the recoil from the back stopper B. The tip in the direction is separated by a gap w from the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position (displacement) (FIG. 8D).

  Then, the sheet feeding roller K rotates while being in contact with the lowermost corrugated cardboard sheet n2 at this time, so that the lowermost corrugated cardboard sheet n2 is fed out in the direction of travel a by the rotational friction force, The front end of the advancing side is brought into contact with the upstream side surface of the gate plate G2, and the lowermost corrugated cardboard sheet n2 has a P− at the lower end on the upstream side of the front gauge Fk whose front end in the advancing direction a is a preset reference position. It is accurately positioned at the front position by the thickness t of the lower end of the front gauge Fk1 from the P line (FIG. 8 (e)). By electrically or mechanically offsetting the position information ahead by the thickness t of the lower end of the front gauge Fk1, the lowermost corrugated cardboard sheet n1 is a reference position in which the leading end in the direction of travel a is set in advance. This is equivalent to accurate positioning on the PP line at the lower end on the upstream side of the front gauge Fk1. Then, the gate plate G2 rises upward by a predetermined amount and returns to the initial position (position shown in FIG. 8 (a)), so that the gate (gap) i has one cardboard sheet (thickness d). It is a gap that can pass, and a gap that cannot pass two corrugated cardboard sheets (thickness 2d). As for the first lowermost corrugated cardboard sheet n1, the thickness of the lower end of the front gauge Fk1 from the PP line on the lower end on the upstream side of the front gauge Fk1 is the same as the alignment method shown in FIGS. 8D and 8E. It is accurately positioned at the front position by t.

  According to the third embodiment of the present invention, the gate plate G2 that opens and closes the gate by moving up and down without moving up and down the front gauge Fk1 that easily contacts a large number of stacked sheet-like workpieces. A plurality of stacked sheet-like sheets by opening the gate after the advancing side tip of the lowermost sheet-like workpiece (for example, n1) is brought into contact with the upstream side surface of the gate plate G2 by the paper feed roller K. Without applying a load to the work, the front end of the lowermost sheet-like work (for example, n1) in the direction of travel a is the front from the PP line on the lower end on the upstream side of the front gauge Fk, which is a preset reference position. The gauge Fk is accurately positioned at the front position by the thickness t at the lower end of the gauge Fk, and the position information ahead by the thickness t at the lower end of the front gauge Fk1 is electrically or mechanically turned off. By setting, the lowermost corrugated cardboard sheet n1 is equivalent to being accurately positioned on the PP line at the lower end on the upstream side of the front gauge Fk1, which is the reference position set in advance in the direction of travel a. become.

(Fourth embodiment)
FIG. 9A is a side view schematically showing a corrugated sheet feeding device Z4 according to the fourth embodiment of the present invention. FIG. 9B is a partially enlarged view in the alternate long and short dash line circle of FIG. In the corrugated cardboard sheet feeding device Z4 according to the fourth embodiment of the present invention, the gate plate G2 is built in the lower side of the front gauge Fk1. The upstream side surface of the gate plate G2 is on the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position. Is the thickness t1 of the lower end of the gate plate G2 equal to the thickness t of the lower end of the front gauge Fk1? Small (FIG. 9B). The position of the gate plate G2 is above the gate i (FIG. 9B). The gate plate G2 is moved up and down by a drive motor Mg2 that is a driving means, and the gate i is opened and closed by the lift and lowering operation, and is moved up and down for each sheet work in the lowermost layer. The gate (gap) i is the smaller of the difference in height between the lower end of the front gauge Fk1 and the upper end of the bridge plate E, or the difference in height between the lower end of the gate plate G2 and the upper end of the bridge plate E. The gate i with the gap i and the gate plate G2 incorporated in the front gauge Fk1 coincides with the height difference h between the lower end of the front gauge Fk1 and the upper end of the paper feed roller K (FIG. 9B). )).

  According to the fourth embodiment of the present invention, the gate plate G2 is aligned with the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position, so that the gate plate G2 is aligned with the front gauge Fk1. The front gauge Fk1 that is easy to contact a large number of stacked sheet-like workpieces is provided with a gate plate G2 that opens and closes the gate by moving up and down without moving up and down. A plurality of stacked sheet-shaped workpieces are formed by opening the gate after the leading edge of the lowermost sheet-shaped workpiece (for example, n1) is brought into contact with the upstream side surface of the gate plate G2 by the sheet feeding roller K. The front end of the lowermost sheet-like workpiece (for example, n1) in the direction of travel a is the reference position set in advance without applying a load. And thus it is accurately positioned in P-P line of the upstream-side lower end of the gauge Fk.

  In FIG. 9B, the plate-like gate plate G2 is built in the front gauge Fk1, but the comb-like gate plate G2 is built in the front gauge Fk1, or the front gauge. A configuration in which the lower end portion of Fk1 itself is replaced with the gate plate G2 may be used. In any case, by aligning the upstream side surface of the gate plate G2 with the PP line at the lower end on the upstream side of the front gauge Fk1, which is a preset reference position, the traveling direction of the lowermost sheet-like workpiece (for example, n1) The tip in the direction a is accurately positioned without being offset on the PP line at the lower end on the upstream side of the front gauge Fk, which is a preset reference position.

  According to these embodiments of the present invention, the gate plate G1 (G2) is disposed below (or above) the gate i, so that the range of the vertical movement of the gate plate G1 (G2) can be minimized. . In general, the front gauge Fk1 (Fg1) serves as a guide at the leading end in the direction of travel a of a large number of sheet-shaped workpieces whose upstream side surfaces are stacked. Since a heavy load corresponding to the amount is applied, a large-scale drive mechanism may be required for the lifting operation, but according to the second to fourth embodiments of the present invention, the lowermost sheet Since a small (small area and light weight) gate plate G1 (G2) that contacts only the advancing side tip of the workpiece (for example, n1) may be moved up and down, a small drive mechanism is sufficient. Further, by adding a small-scale modification to the existing sheet workpiece feeding device X1, the sheet workpiece feeding devices Z2, Z3, and Z4 of the present invention can be used.

  As described above, the present invention is not limited to the embodiment described above. For example, the timing at which the gate plate G1 (G2) is raised (lowered) is not limited to the timing described above, and sheet feeding is performed after the lowermost sheet-like workpiece (for example, n1) is fed from the front gauge Fk1. Any timing may be used until the roller K rotates in contact with the next sheet-like workpiece (for example, n2). In the sheet feeding method of the present invention, the feeding of the next sheet workpiece (for example, n2) is started after the sheet feeding roller K completes the feeding of the lowermost sheet workpiece (for example, n1). It is preferable that the sheet-like workpiece (for example, n2) in the lowermost layer is brought into contact with the upstream surface of the front gauge Fk1 or the upstream surface of the gate plate G1 (G2) by the paper feed roller K during the standby time until the start. By effectively using the waiting time, it is possible to improve the tact time of the sheet-like work sheet feeding device.

  Further, in the sheet-like workpiece feeding method of the present invention, the sheet feeding roller K is lowered to the intermediate position where the sheet feeding roller K slightly protrudes from the grating Q, and then the sheet feeding roller K is started to rotate. The leading Q of the lowermost sheet-like work (for example, n1) is brought into contact with the upstream surface of the gate plate G1 (G2) by the paper feed roller K, and the paper feed roller K protrudes to a set height. In the lowest position, it is preferable to stop the rotation of the paper feed roller K. The sheet Q is lowered to the intermediate position where the sheet feed roller K slightly protrudes from the sheet Q, and then the sheet feed roller K is started to rotate. Only the driving force necessary to bring (for example, n1) into contact with the upstream surface of the gate plate G1 (G2) is obtained, and the lowermost sheet-like workpiece (for example, n1) is placed on the upstream surface of the gate plate G1 (G2). In the abutted state, the paper feed roller K stops, so that excessive force is not applied to the lowermost sheet-like work (for example, n1), and the lowermost sheet-like work (for example, n1) may be damaged. Absent. The sheet-like workpiece sheet feeding device Z1 (Z2, Z3) of the present invention is preferably provided with a driving motor as a driving unit for each of the driving shafts of the plurality of sheet feeding rollers K. Since a drive motor is provided for each drive shaft of the plurality of paper feed rollers K, the plurality of paper feed rollers K can be driven independently. For example, the lowermost sheet-like work n1 is By stopping the rotation in the order of Kc, Kb, and Ka from the feeding roller Kd that has been sent out, only the lowermost sheet-like work (for example, n1) is surely sent out. There is no need to worry about paper jams due to feeding to the side. However, the minute angle rotation amounts of the respective feed rollers Ka, Kb, Kc, Kd are not necessarily equal. After advancing the front end of the lowermost sheet-like workpiece (for example, n1) to the front gauge Fg1 or the gate plate G (G1, G2), the sheet feeding rollers Ka, Kb, Kc, Kd and the lowermost sheet In order not to give more sheet driving force than necessary, it is necessary to prevent the workpiece (e.g. n1) from slipping a minute amount and not to damage the leading edge of the lowermost sheet-like workpiece (e.g. n1). With the four-axis feed rollers Ka, Kb, Kc, Kd, the rotation amount of the two-axis feed rollers (for example, Kc, Kd) is set to the rotation amount of the other two-axis feed rollers (for example, Ka, Kb). The amount may be less than the amount. That is, four-axis driving may be performed only in the initial stage for overcoming the static friction, and after driving once, switching to only two-axis driving may be performed. The front gauge Fg1 or the gate plate G (G1, G2) is preferably provided with a sensor J for detecting the contact of the lowermost sheet-like workpiece n. Since the sensor J detects the contact of the lowermost corrugated cardboard sheet n and sends a contact detection signal to the control circuit C, the front end of the lowermost corrugated cardboard sheet n is at the front gauge Fg1 or the gate plate G (G1). , G2), and at the same time, the control circuit C sends a stop signal to the drive motors Mka, Mkb, Mkc, Mkd, which are drive means for the paper feed rollers K (Ka, Kb, Kc, Kd), and feeds the paper feed rollers. K (Ka, Kb, Kc, Kd) is forcibly stopped. The contact sensor J is preferably arranged on the upstream side surface of the front gauge Fg1 or the gate plate G (G1, G2), but it is also possible to arrange a non-contact sensor at a predetermined position other than the above.

  Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

FIG. 1A is a side view schematically illustrating a corrugated cardboard sheet feeding device according to a first embodiment of the present invention, and FIG. 1B is a diagram within a one-dot chain line circle in FIG. It is a partial enlarged view. FIG. 2 is a side view schematically showing a corrugated sheet feeding device and its operation according to the first embodiment of the present invention. FIG. 3 is a timing chart schematically showing the operation of the cardboard sheet feeding device according to the first embodiment of the present invention. FIG. 4A is a side view schematically illustrating a corrugated cardboard sheet feeding device according to the second embodiment of the present invention, and FIG. 4B is a diagram within a dashed-dotted line circle in FIG. It is a partial enlarged view. FIG. 5 is a side view schematically showing the operation of the cardboard sheet feeding device according to the second embodiment of the present invention. FIG. 6 is a timing chart schematically showing the operation of the cardboard sheet feeding device according to the second embodiment of the present invention. FIG. 7A is a side view schematically illustrating a corrugated cardboard sheet feeding device according to a third embodiment of the present invention, and FIG. 7B is a diagram within a dashed-dotted line circle in FIG. It is a partial enlarged view. FIG. 8 is a side view schematically showing the operation of the cardboard sheet feeding device of the third exemplary embodiment of the present invention. FIG. 9A is a side view schematically showing a corrugated cardboard sheet feeding device according to a fourth embodiment of the present invention, and FIG. 9B is a diagram within a dashed-dotted line circle in FIG. It is a partial enlarged view. FIG. 10 is a side view schematically showing a conventional corrugated sheet feeding apparatus and its operation. FIG. 11 is a timing chart schematically showing the operation of the conventional corrugated cardboard sheet feeding device.

Explanation of symbols

Z1, Z2, Z3, Z4 Sheet-like work sheet feeding device (corrugated cardboard sheet feeding device),
Fg1, Fk1 front gauge,
G, G1, G2 gate plate,
Mf1, Mg1, Mg2 drive motor (drive means),
h The gap between the front gauge and paper feed roller,
i Gate (gap between the front gauge and the bridge plate),
J sensor,
Q Great,
P reference position,
K paper feed roller,
B Back stopper,
E Bridge board,
S suction box,
n, n1, n2, .. sheet-like workpiece (corrugated cardboard sheet),
d Thickness of sheet-like workpiece (thickness of cardboard sheet)

Claims (5)

Among the stacked sheet-like workpieces, the lowermost sheet-like workpiece is sent to the printing unit side, and the amount of protrusion with respect to the plurality of paper feed rollers is adjusted by its up-and-down movement, so that Great for adjusting contact / separation with the lower sheet-like workpiece, front gauge forming a gate for sending only the lowermost sheet-like workpiece to the printing unit side, and opening and closing the gate by raising and lowering the gate Using a sheet-like workpiece feeding device with a gate plate,
Gate plate in a state in which the paper feed roller from lowers the until said intermediate position Great that slightly protrudes from the Great, the progression side tip of the lowermost sheet-shaped workpiece by rotating the feed roller closed gate is brought into contact, then causes further lowered the Great to the lowest position of the Great said feed roller once stops the sheet feed roller protrudes to the set height, the lowermost sheet-shaped work to open the gate contact releases the then paper sheet workpiece, characterized in that feeding the the rotated with the sheet-like work of the paper feed roller of the advancing side tip and the gate plate. In the waiting time from when the sheet feeding roller completes feeding of the lowermost sheet-like workpiece to when the feeding of the next sheet-like workpiece is started, the plurality of feeding rollers are driven independently for each drive shaft. small angular rotation is allowed by the paper sheet workpiece according to claim 1, wherein said causing abutting the progression side tip of the lowermost sheet-shaped workpiece to the gate plate closed the gate with. Among the stacked sheet-like workpieces, the lowermost sheet-like workpiece is sent to the printing unit side, and the amount of protrusion with respect to the plurality of paper feed rollers is adjusted by its up-and-down movement, so that Great for adjusting contact and separation with the lower sheet-like workpiece, a front gauge that forms a gate for sending the lowermost sheet-like workpiece to the printing unit, and a gate that opens and closes the gate by its vertical movement and a plate, the gate plate is disposed below or above the gate,
The gate plate with the gate closed at the leading edge of the lowermost sheet-like workpiece by rotating the paper feed roller after lowering the grate to an intermediate position where the paper feed roller slightly protrudes from the grate After that, the paper feed roller is temporarily stopped to further lower the grate to the lowest position where the paper feed roller protrudes to the set height, and the gate is opened to open the lowermost sheet-like workpiece. A sheet-like workpiece feeding device, wherein the sheet-like workpiece is fed out by releasing the contact between the forward end of the sheet and the gate plate, and then rotating the feeding roller . Each of the plurality of paper feed rollers is provided with an independent drive motor for each drive shaft, and the paper feed roller is rotated by a small angle so that the leading edge of the lowermost sheet-like workpiece is brought into contact with the gate plate with the gate closed. 4. The sheet work sheet feeding device according to claim 3 , wherein the sheet feeding device is in contact with each other. Wherein the gate plate, sheet-like work of the sheet feeding apparatus according to claim 3, wherein the sensor for detecting the contact of the sheet workpiece are disposed.

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