JP5537231B2 - Sheet feeder for corrugated sheet box making machine - Google Patents

Description

  The present invention relates to a sheet feeding device in a corrugated cardboard box making machine that performs processing such as printing, ruled lines, grooving, and punching on corrugated cardboard sheets, and more particularly, corrugated cardboard sheets while correcting warpage of a plurality of cardboard sheets loaded. The present invention relates to a sheet supply apparatus that supplies sheets one by one to a processing apparatus of a sheet box making machine.

  Generally, as disclosed in Patent Document 1, the corrugated cardboard box making machine includes a plurality of processing devices arranged in order in the conveying direction of the corrugated cardboard sheet. The plurality of processing devices include a sheet supply device that supplies a corrugated sheet from the upstream side in the conveying direction, a printing device that performs printing on the supplied corrugated cardboard sheet, a crease slotter device that performs ruled line and grooving, and punching processing. Die cutting devices and the like to be arranged are arranged. Conventionally, various types of sheet feeding apparatuses such as a kicker type and a feeding roll type have been proposed. As a kicker type, as disclosed in Patent Document 1, the kicker reciprocates back and forth to push out the rear end of the cardboard sheet. In addition, as disclosed in Patent Document 2, the delivery roll type has a configuration in which a number of delivery rolls rotate in contact with the lower surface of the corrugated cardboard sheet and deliver the corrugated cardboard sheet by frictional resistance with the lower surface of the sheet. is there.

JP 2000-62981 A Japanese Patent Laid-Open No. 11-314785

  There are various types of corrugated cardboard sheets depending on the product to be packed. Moreover, since the moisture content of the corrugated cardboard sheet varies depending on the environment at the production stage, if the moisture content differs between the upper surface and the lower surface of the corrugated cardboard sheet, a phenomenon occurs in which the corrugated cardboard sheet warps in various directions. . In particular, the above warp phenomenon appears remarkably in a relatively thin and wide corrugated cardboard sheet.

  Since the sheet supply device needs to supply a plurality of stacked cardboard sheets one by one from the lowermost sheet, the distance between the mounting table on which the cardboard sheets are placed and the front gate is the sheet 1. The interval is set to be larger than the thickness of the sheet and smaller than the thickness of the two sheets.

  However, a plurality of corrugated cardboard sheets are warped in various directions. For this reason, even if the warp of the lowermost corrugated cardboard sheet is corrected to some extent due to the gravity of the plurality of corrugated cardboard sheets stacked in the upper position, the warp phenomenon cannot be reliably eliminated. As a result, in the sheet supply apparatus disclosed in Patent Documents 1 and 2 above, no means for reliably eliminating the warp phenomenon of the corrugated cardboard sheet is employed. There are things to do.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet supply device that can reliably correct the warping phenomenon of a corrugated cardboard sheet and prevent the cardboard sheet from being jammed.

In order to achieve the above object, a first aspect of the present invention according to claim 1 is a sheet supply apparatus in a corrugated cardboard box making machine including a processing apparatus that performs processing such as printing and ruled lines on a corrugated cardboard sheet. A corrugated table on which the corrugated cardboard sheets are stacked and a sheet supply direction in which the corrugated cardboard sheets are fed toward the processing device are positioned on the downstream side of the placing table, and are located at the bottom of the stacked corrugated cardboard sheets. A front gate disposed above the mounting table at an interval allowing passage of the corrugated cardboard sheet on the side, and a corrugated sheet positioned downstream of the front gate in the sheet supply direction and passed through the front gate A conveying unit that conveys the sheet toward the processing device, and a lowermost cardboard sheet of the plurality of stacked cardboard sheets. A feed actuating part that feeds the sheet from the front gate in the sheet feeding direction, and a pressing body that is supported so as to move up and down to press the stacked cardboard sheets from above at a position close to the front gate. And a sheet pressing mechanism that performs a pressing operation in synchronization with a feeding operation cycle of the supply operation unit, and the front gate is supported to be movable in a direction orthogonal to the sheet supply direction, and the pressing body Is supported by the front gate so as to be movable up and down.

In the first aspect of the invention, the supply operation unit may have any configuration as long as it has a function of feeding the cardboard sheet from the front gate. For example, a configuration in which the kicker pushes out the rear end portion of the cardboard sheet or a configuration in which the feed roll contacts the lower surface of the cardboard sheet and sends it out.

In the first aspect of the invention, the pressing body is supported movably by a plate-like pressing member or a rotatable roll as long as the pressing body is configured to press the cardboard sheets stacked on the mounting table from above. It may be a belt .

In the first aspect of the invention, the sheet pressing mechanism is configured such that the feeding operation of feeding the corrugated cardboard sheet from the front gate by the feeding actuating unit is not disturbed by the pressing of the cardboard sheet by the pressing body. Any configuration may be used as long as the cycle and the pressing operation by the pressing body are synchronized. For example, even if the supply operation unit and the sheet pressing mechanism are mechanically coupled to synchronize, the operation position of the supply operation unit and the sheet pressing mechanism is detected to be electrically synchronized. May be. In addition, the operator sets a temporal relationship between the cycle of the feeding operation of the feeding operation unit and the cycle of the pressing operation of the sheet pressing mechanism at the start of operation of the sheet feeding device, and thereafter, both cycles have a synchronous relationship. It may have a configuration in which each is executed.

In the first aspect of the invention, the position where the pressing body presses the plurality of cardboard sheets is such that the warpage of the cardboard sheets can be corrected at least temporarily so as not to hook the tip portion of the cardboard sheets to the front gate. Any position close to the front gate is sufficient. Therefore, the pressing body is not limited to a position close in the sheet supply direction on the front side of the front gate, but is arranged in a position close in the sheet width direction orthogonal to the sheet supply direction, such as the side of the front gate or diagonally in front. It may be a configuration.

  According to a specific aspect of the present invention, the sheet pressing mechanism includes a pressing drive unit that lowers the pressing body so that the pressing body presses the stacked cardboard sheets, and the pressing driving unit. However, from the time when the rear end portion of the lowermost cardboard sheet of the plurality of stacked cardboard sheets reaches the front gate, the supply actuating portion is the lowermost cardboard of the plurality of stacked cardboard sheets. In the predetermined period until the time when the sheet feeding operation is started, the sheet pressing portions of the stacked cardboard sheets are pressed by the pressing body.

  In this specific aspect, the predetermined period of time during which the pressing body presses the front end portion of the sheet, the next lowermost corrugated cardboard sheet is fed out after the rear end portion of the lowermost corrugated cardboard sheet reaches the front gate. The length of the predetermined period is not limited as long as it is at least a part of the period until the operation is started. That is, the predetermined period may be changed according to the size or type of the corrugated cardboard sheet to be pressed, and may be changed according to the environment in which the corrugated cardboard sheet is produced.

  According to a third aspect of the present invention, there is provided a suction mechanism disposed below the placement table for sucking the plurality of stacked cardboard sheets downward.

According to a specific aspect of the present invention, a plurality of the front gates and the pressing bodies are provided, and the plurality of pressing bodies are supported so as to be movable in a direction orthogonal to the sheet supply direction. It is the structure each supported by the gate.

In order to achieve the above object, a second aspect of the present invention according to claim 5 is a sheet supply apparatus in a corrugated sheet box making machine including a processing apparatus that performs processing such as printing and ruled lines on a corrugated cardboard sheet. A corrugated table on which the corrugated cardboard sheets are stacked and a sheet supply direction in which the corrugated cardboard sheets are fed toward the processing device are positioned on the downstream side of the placing table, and are located at the bottom of the stacked corrugated cardboard sheets. A front gate disposed above the mounting table at an interval allowing passage of the corrugated cardboard sheet on the side, and a corrugated sheet positioned downstream of the front gate in the sheet supply direction and passed through the front gate A conveying unit that conveys the sheet toward the processing device, and a lowermost cardboard sheet of the plurality of stacked cardboard sheets. A feed actuating part that feeds the sheet from the front gate in the sheet feeding direction, and a pressing body that is supported so as to move up and down to press the stacked cardboard sheets from above at a position close to the front gate. And a sheet pressing mechanism that performs a pressing operation in synchronization with a feeding operation cycle of the supply operation unit, and the sheet pressing mechanism is for the pressing body to press the plurality of stacked cardboard sheets It is the structure which has a position adjustment part which adjusts a press position with respect to the mounting surface of the said mounting table.

In order to achieve the above object, a third aspect of the present invention according to claim 6 is a sheet supply apparatus in a corrugated board box making machine including a processing apparatus that performs processing such as printing and ruled lines on the corrugated board sheet. A corrugated table on which the corrugated cardboard sheets are stacked and a sheet supply direction in which the corrugated cardboard sheets are fed toward the processing device are positioned on the downstream side of the placing table, and are located at the bottom of the stacked corrugated cardboard sheets. A front gate disposed above the mounting table at an interval allowing passage of the corrugated cardboard sheet on the side, and a corrugated sheet positioned downstream of the front gate in the sheet supply direction and passed through the front gate A conveying unit that conveys the sheet toward the processing device, and a lowermost cardboard sheet of the plurality of stacked cardboard sheets. A feed actuating part that feeds the sheet from the front gate in the sheet feeding direction, and a pressing body that is supported so as to move up and down to press the stacked cardboard sheets from above at a position close to the front gate. And a sheet pressing mechanism that performs a pressing operation in synchronization with a feeding operation cycle of the supply operation unit, and the sheet pressing mechanism is supported in a vertically movable manner, and the stacked plurality A first drive unit fixed to the movable support to move the pressing body up and down between a pressing position and a separation position with respect to the cardboard sheet, and a use position where the pressing body can perform a pressing operation And a second drive unit for lowering or raising the movable support body between the pressing body and a retracted position where the pressing body cannot perform a pressing operation.

In the second and third aspects of the invention, the pressing body may be supported so as to be movable in a direction orthogonal to the sheet supply direction according to the width of the corrugated cardboard sheet. It may be.

In general, a plurality of stacked cardboard sheets are often warped in various directions depending on the distribution of moisture contained therein. For example, the peripheral edge of the cardboard sheet may warp upward, warp downward, or in some cases warp in an S shape. As described above, since each corrugated cardboard sheet is warped in various directions, the leading end portion of the corrugated cardboard sheet is caught by the front gate, and a paper jam may occur. Therefore, in the first aspect of the present invention, the sheet pressing mechanism is supported so that it can move up and down in order to press a plurality of stacked cardboard sheets from above at a position close to the front gate. And the pressing operation is performed in synchronization with the cycle of the feeding operation of the supply operation unit. By the pressing operation of the pressing body, the warp of the stacked cardboard sheets is corrected. The corrected corrugated cardboard sheet can smoothly pass through the front gate, and the corrugated cardboard sheet is reliably supplied.

In the first aspect of the invention , the pressing body is supported so as to be movable in a direction orthogonal to the sheet supply direction. As a result, the pressing body can change the position of pressing the corrugated cardboard sheet according to the width of the corrugated cardboard sheet. Even when the front gate is moved in the direction perpendicular to the sheet supply direction, The cardboard sheet can be reliably pressed.

Furthermore, in the first aspect of the invention , the front gate is supported so as to be movable in a direction orthogonal to the sheet supply direction, and the pressing body is supported by the front gate so as to be movable up and down. As a result, the pressing body can press the portion of the corrugated cardboard sheet that may be caught by the front gate, and can reliably prevent a paper jam.

  According to a specific aspect of the present invention, from the time when the rear end portion of the lowermost cardboard sheet reaches the front gate to the time when the next lowermost cardboard sheet feeding operation starts. In the predetermined period, the pressing body presses the sheet leading end portions of the stacked cardboard sheets. As a result, the warpage of the corrugated cardboard sheet can be reliably corrected without hindering the feeding operation of the corrugated cardboard sheet.

  In a specific aspect of the present invention, the suction mechanism sucks the plurality of stacked cardboard sheets downward. When the corrugated cardboard sheet is warped, the suction mechanism creates a gap between the lower surface of the corrugated cardboard sheet and the upper surface of the mounting table, and cannot sufficiently suck the corrugated cardboard sheet toward the mounting table. In this specific aspect, the warp in the vicinity of the front gate is corrected on the front end side of the cardboard sheet by the pressing body of the sheet pressing mechanism, and the front end portion of the cardboard sheet is sucked by the suction mechanism. By this correction and suction, there is no gap between the front end portion of the corrugated cardboard sheet, particularly the sheet portion near the front gate, and the upper surface of the mounting table, so that the corrugated cardboard sheet can pass through the front gate smoothly. it can.

According to a specific aspect of the present invention, a plurality of front gates and pressing bodies are provided, and the plurality of pressing bodies are respectively supported by a plurality of front gates supported so as to be movable in a direction orthogonal to the sheet supply direction. . As a result, a plurality of pressing bodies can press a plurality of portions of the corrugated cardboard sheet that may be caught by a plurality of front gates. Can be prevented.

In the second aspect of the present invention , the position adjusting unit of the sheet pressing mechanism sets the pressing position for pressing the plurality of corrugated cardboard sheets loaded with the pressing body with respect to the mounting surface of the mounting table. Adjust. The number of corrugated sheets stacked on the mounting table is preferably ensured by a predetermined number of sheets corresponding to a predetermined sheet supply speed from the viewpoint of reducing the warpage of the sheet. The pressing position is adjusted to a position corresponding to a predetermined number of sheets.

In general, when the corrugated cardboard sheet is relatively thin and has a large width and length, various large warpages are likely to occur. On the contrary, when the corrugated cardboard sheet is a sheet having a small width and length, the warpage is small and no correction of the warp is necessary. In addition, small sheets are often supplied at high speed toward a processing apparatus such as printing, and the number of cardboard sheets stacked on the sheet supply apparatus is considerably larger than that of large sheets. For this reason, when the corrugated cardboard sheet is a small sheet, it is necessary to retract the pressing body above the stacked corrugated cardboard sheet in order to increase the number of stacked sheets. Therefore, in the third aspect of the present invention described in claim 6 , the second drive unit includes a use position where the pressing body can perform the pressing operation and a retracted position where the pressing body cannot perform the pressing operation. In the meantime, the movable support is lowered or raised. As a result, when a pressing operation by the pressing body is not required, such as when a sheet having a small width and length is supplied, the pressing body can be raised to the retracted position, so that one sheet feeding device is provided. Therefore, corrugated sheets of various sizes from large sheets to small sheets can be supplied at high speed without paper jams.

1 is a front view showing an overall configuration of a corrugated board box making machine 1 according to an embodiment of the present invention. It is a front view which shows the sheet | seat supply apparatus 2 in the said cardboard sheet box making machine. FIG. 5 is a side view of the sheet feeding device 2 including the sheet pressing mechanism 300 as viewed from the right side (upstream side in the sheet feeding direction). It is sectional drawing which cut | disconnects according to the AA line shown in FIG. 3, and shows the said sheet supply apparatus 2. FIG. FIG. 4 is a side view of the sheet pressing mechanism 300 disposed on the front side (right side in the drawing) in FIG. 3 as viewed from the right side (upstream side in the sheet supply direction). It is a front view which expands and shows sliding body 303A and clamp member 310A by fracture | rupturing a part of sliding body 303A. 3 is a block diagram showing an electrical configuration for controlling the operation of the sheet pressing mechanism 300. FIG. 4 is a flowchart for explaining the operation of the sheet pressing mechanism 300; It is explanatory drawing for demonstrating the state which the press body 304A of the said sheet | seat press mechanism 300 exists in a retracted position. It is explanatory drawing for demonstrating the state which the press body 304A of the said sheet | seat press mechanism 300 exists in separation position PU. It is explanatory drawing for demonstrating the state which the press body 304A of the said sheet | seat press mechanism 300 exists in press position PD. It is a timing chart for explaining the temporal relationship between the pressing operation of the pressing body 304A and the feeding operation of the supply claw portion 217.

[Embodiment]
An embodiment in which the present invention is applied to a corrugated cardboard box making machine that performs processing such as printing and grooving on a corrugated cardboard sheet will be described below with reference to the accompanying drawings. In the drawings, a vertical direction, a horizontal direction, and a front-rear direction are determined according to directions indicated by arrows.

<Overall configuration>
FIG. 1 is a front view showing an overall configuration of a corrugated cardboard box making machine 1 according to the present embodiment. The corrugated cardboard box making machine 1 includes a sheet supply device 2 that supplies the corrugated cardboard sheets SH one by one toward the conveyance path PL, and the cardboard sheet SH supplied from the sheet supply device 2 along the conveyance path PL. The conveyance device 3 includes a conveyance device 3 and a plurality of processing devices arranged along the conveyance path PL in order to sequentially process the conveyed corrugated cardboard sheet SH.

<Schematic configuration of processing equipment>
In the present embodiment, as a plurality of processing devices, a printing device 4 that performs printing on the corrugated cardboard sheet SH, a creaser device 5 that applies ruled lines in the conveying direction to the corrugated cardboard sheet SH, and a slotter device 6 that performs grooving on the corrugated cardboard sheet SH. A die cutter device 7 for punching the corrugated cardboard sheet SH is provided. The printing device 4, the cleaner device 5, the slotter device 6, and the die cutter device 7 of this embodiment are examples of the processing device of the present invention.

  As shown in FIG. 1, the transport device 3 includes a printing transport unit 30, a cleaner transport unit 31, and a slotter transport unit 32. The printing device 4 mainly includes a printing cylinder 40, a printing plate member for printing on the corrugated cardboard sheet SH, an ink application device, and a press roll 43. The creaser device 5 has an upper ruled line roll 50 and a lower ruled line roll 51 across the transport path PL. The slotter device 6 has a double slotter type configuration having a first slotter unit 61 disposed on the upstream side and a second slotter unit 62 disposed on the downstream side along the transport path PL. The die cutter device 7 has a rotary die cutter type configuration, and includes a die cylinder 70 and an anvil cylinder 71 with a conveyance path PL interposed therebetween. A pair of punching dies 73 and 74 for punching the corrugated cardboard sheet SH are attached to a plate-like body such as a plywood veneer, and the plate-like body is wound around the outer peripheral surface of the die cylinder 70 in a positional relationship in which both dies are point-symmetric. Be dressed. Processing devices such as the conveyance device 3 and the printing device 4 are connected to the main drive motor 8 via a known power transmission mechanism.

<Configuration of sheet feeding device>
The configuration of the sheet supply apparatus 2 will be described below with reference to FIG. FIG. 2 is an enlarged front view showing the configuration of the sheet supply apparatus 2. The sheet supply apparatus 2 includes a hopper 20, a belt kicker mechanism 21, and a pair of feed rolls 22A and 22B. Further, the sheet supply apparatus 2 includes a placement table 23 that extends in the horizontal direction at the same height as the conveyance path PL. The mounting table 23 of this embodiment is an example of the mounting table of the present invention.

(Configuration of hopper)
In FIG. 2, the hopper 20 is disposed on the placement table 23, and includes a front gate 201 </ b> A and a back guide 202 that are separated from each other in the sheet supply direction FD of the cardboard sheet SH. The plurality of cardboard sheets SH are stacked and accommodated between the front gate 201A and the back guide 202. The lowermost corrugated cardboard sheet SH is configured to be supplied one by one from the gap between the front gate 201A and the mounting table 23. The distance between the front gate 201A and the placement table 23 is a gap that is larger than the thickness of one cardboard sheet SH and smaller than the thickness of two sheets. The back guide 202 is configured to be movable in a direction parallel to the sheet supply direction FD with respect to the front gate 201A, and is configured to accommodate cardboard sheets having different lengths in the sheet supply direction FD. Further, the back guide 202 performs an operation of lifting the rear end portion of the cardboard sheet SH in the hopper 20 to a height that allows movement of a supply claw portion described later, and the rear end portion of the cardboard sheet SH is viewed from below. A large number of supporting great 203 is provided. Since the back guide 202 has a known configuration as disclosed in Japanese Patent Application Laid-Open No. 2000-62981, etc., detailed description thereof is omitted.

(Configuration of belt kicker mechanism)
The belt kicker mechanism 21 has a suction assist kicker configuration, and is arranged below the placement table 23 and pushes the lowermost corrugated cardboard sheet SH accommodated in the hopper 20 in the sheet supply direction FD. .

  The belt kicker 211 includes a drive pulley 213 fixed to the drive shaft 212, a driven pulley 215 rotatably supported by a support shaft 214, and an endless belt 216 wound around both pulleys. The drive shaft 212 and the support shaft 214 are rotatably supported by the frame of the sheet supply device 2 and are arranged extending in parallel in the front-rear direction. The supply claw portion 217 protrudes from the endless belt 216 so as to abut the rear end portion of the lowermost corrugated cardboard sheet SH accommodated in the hopper 20. The drive shaft 212 is connected to the kicker drive motor 218 via a known power transmission mechanism such as a gear train, and the drive pulley 213 is rotated in the direction of the arrow shown in FIG. 2 by the rotation of the kicker drive motor 218.

  A suction chamber 24 is provided below the belt kicker mechanism 21 and connected to a suction blower 25. Since the lowermost corrugated cardboard sheet SH in the hopper 20 is attracted to the endless belt 216 by the suction action of the suction blower 25, the supply claw part 217 can surely come into contact with the rear end part of the corrugated cardboard sheet SH. . The belt kicker mechanism 21 of the present embodiment is an example of the supply operation unit of the present invention, and the combination of the suction chamber 24 and the suction blower 25 of the present embodiment is an example of the suction mechanism of the present invention.

(Configuration of feed roll)
The pair of feed rolls 22A and 22B are disposed downstream of the hopper 20 in the sheet supply direction FD. More specifically, when the lowermost corrugated cardboard sheet SH in the hopper 20 is pushed out in the sheet feeding direction FD by the feed claw 217, the feed rolls 22A and 22B sandwich the leading end portion of the pushed cardboard sheet SH. It is placed at a position where it can. The feed rolls 22A and 22B are connected to the main drive motor 8 shown in FIG. 2 via a known power transmission mechanism, and rotate in the direction of the arrow shown in FIG. The feed rolls 22 </ b> A and 22 </ b> B are driven to rotate and supply the cardboard sheet SH toward the conveyance path PL while sandwiching the cardboard sheet SH. The feed rolls 22A and 22B of the present embodiment are an example of the conveying unit of the present invention, and the sheet supply direction FD of the present embodiment is an example of the sheet supply direction of the present invention.

<Mechanical configuration of sheet pressing mechanism>
The sheet supply device 2 includes a sheet pressing mechanism 300 that presses a plurality of cardboard sheets SH stacked on the placement table 23 from above. The mechanical configuration of the sheet pressing mechanism 300 will be described with reference to FIGS.

  First, a structure for mechanically supporting the sheet pressing mechanism 300 in the sheet supply apparatus 2 will be described. FIG. 3 is a side view of the sheet supply apparatus 2 as viewed from the right side, and FIG. 4 is a cross-sectional view taken along line AA shown in FIG. In FIG. 3, a pair of support frames 220 and 221 are arranged at the front and rear. A support stay 222 is fixedly installed on the upper ends of the support frames 220 and 221. A pair of guide bars 223 and 224 are installed in the middle of both support frames 220 and 221 in a line up and down. As shown in FIG. 4, a pair of screw shafts 225 and 226 are installed in the middle of both support frames 220 and 221 side by side. In the present embodiment, a pair of front gates 201A and 201B is provided as a front gate. Both front gates 201A and 201B are respectively fixed to a pair of movable supports. Both movable supports are provided with drive gears that are slidably attached to both guide bars 223 and 224 and screwed onto both screw shafts 225 and 226. A positioning motor is fixed on each movable support and rotates the drive gear. In FIG. 4, a movable support 227A to which the front gate 201A is fixed is shown, and a positioning motor 228A is fixed on the movable support 227A. The front gates 201A and 201B of the present embodiment are an example of the front gate of the present invention, and the pair of sheet pressing mechanisms 300 of the present embodiment are an example of the sheet pressing mechanism of the present invention.

  In FIG. 3, a pair of side joggers 229 and 230 are slidably attached to both guide bars 223 and 224. Both side joggers 229 and 230 are in contact with both end portions extending in the sheet supply direction FD of the corrugated cardboard sheet SH, and in the sheet width direction orthogonal to the sheet supply direction FD, Arrange the array. Both side joggers 229 and 230 have a configuration in which both end portions of the corrugated cardboard sheet SH are aligned while swinging, and are well known. Both the side joggers 229 and 230 are positioned in the sheet width direction by driving the positioning motor, similarly to the both movable supports.

  The sheet pressing mechanism 300 is disposed on both front gates 201A and 201B. The sheet pressing mechanism 300 disposed on the front gate 201A will be described below as an example. FIG. 5 is an enlarged side view showing only the sheet pressing mechanism 300 disposed on the front gate 201A.

  The sheet pressing mechanism 300 mainly includes a first air cylinder 301A, a second air cylinder 302A, a sliding body 303A, and a pressing roll 304A. The first air cylinder 301A is fixed to a support base 305A fixed to the upper end of the front gate 201A. The second air cylinder 302A is fixed to the sliding body 303A. The sliding body 303A is attached to the front gate 201A so as to be slidable in the vertical direction. The lower end of the operating rod 306A of the first air cylinder 301A is connected to the upper end of the cylinder case of the second air cylinder 302A. The lower end of the operating rod 307A of the second air cylinder 302A is connected to the main support 308A.

  In FIG. 5, the pressing roll 304A has a main pressing roll 304A1 and a sub pressing roll 304A2. The main support 308A rotatably supports the main pressing roll 304A1. The sub-support body 309A is fixed to the main support body 308A and rotatably supports the sub-press roll 304A2. The auxiliary pressing roll 304A2 is disposed closer to the side jogger 229 than the main pressing roll 304A1.

  As shown in FIG. 5, four clamp members 310A are provided on the sliding body 303A. FIG. 6 is an enlarged front view showing a part of the sliding body 303A in a broken state. In FIG. 6, each clamp member 310 </ b> A includes a screw portion 310 </ b> A <b> 1 that is screwed into a screw hole provided in the sliding body 303 </ b> A, and a lever portion 310 </ b> A <b> 2 that is coupled to the screw portion. When the screw portion 310A1 is tightened into the screw hole, the rubber material fixed to the tip of the screw portion 310A1 is pressed against the right side surface of the front gate 201A. By this pressing, the sliding body 303A is held by the front gate 201A. By changing the holding position of the sliding body 303A with respect to the front gate 201A, the user can adjust the height at which the main pressing roll 304A1 and the auxiliary pressing roll 304A2 are in contact with the upper surfaces of the plurality of cardboard sheets SH, that is, from the placement table 23. The vertical position of both rolls 304A1 and 304A2 can be adjusted. The combination of the sliding body 303A and the clamp member 310A of the present embodiment is an example of the position adjusting unit of the present invention.

  In FIG. 3, the sheet pressing mechanism 300 disposed on the front gate 201B has the operating bar 306B and is fixed to the support base 305B, similarly to the sheet pressing mechanism 300 disposed on the front gate 201A. It mainly includes an air cylinder 301B, a second air cylinder 302B having an operating rod 307B, a sliding body 303B including a clamp member, and a pressing roll 304B. The pressing roll 304B also includes a main pressing roll 304B1 and a sub pressing roll 304B2. The sub press roll 304B2 is disposed closer to the side jogger 230 than the main press roll 304B1. The main pressing rolls 304A1 and 304B1 of the present embodiment are examples of the pressing body of the present invention, and the sub pressing rolls 304A2 and 304B2 of the present embodiment are an example of the sub pressing body of the present invention. The sliding bodies 303A and 303B of the present embodiment are examples of the movable support body of the present invention, and the first air cylinders 301A and 301B of the present embodiment are examples of the second drive unit of the present invention. The second air cylinders 302A and 302B of the embodiment are an example of the first drive unit of the present invention.

  Since both the sub-pressing rolls 304A2 and 304B2 are arranged closer to the side joggers 229 and 230 than the main pressing rolls 304A1 and 304B1, the end portions on both sides of the corrugated cardboard sheet SH positioned apart in the sheet width direction are surely secured. Can be pressed. Accordingly, the front end side of the corrugated cardboard sheet SH can be pressed in a wider range, the warpage of the corrugated cardboard sheet at the lowest position can be effectively corrected, and the front end side of the corrugated cardboard sheet SH can be corrected in the sheet width direction. Even when a sheet with a bent end is newly laminated from above, the swing of the side jogger is reliably imparted to the cardboard sheet, and the positions in the width direction of the cardboard sheet can be effectively aligned.

<Configuration of detector, etc.>
A pulse generator 311 and a position detector 312 are provided in order to synchronize the cycle of the feeding operation of the corrugated sheet SH by the feeding claw portion 217 of the sheet feeding device 2 and the pressing operation of the sheet pressing mechanism 300. In FIG. 2, a pulse generator 311 is connected to the output shaft of the kicker drive motor 218, and generates a pulse signal PS according to the rotation of the output shaft. The position detector 312 generates a detection signal DS when the supply claw 217 reaches a predetermined position. For example, in FIG. 2, when the supply claw portion 217 reaches a position below the drive pulley 213, the position detector 312 detects a mark affixed in the vicinity of the supply claw portion 217 and generates a detection signal DS. To do.

<Electrical configuration>
The basic electrical configuration of the corrugated cardboard box making machine 1 of the present embodiment and the basic electrical configuration of the sheet feeding device 2 are known from Japanese Patent Application Laid-Open No. 2009-291992, and so on. Only the electrical configuration of the sheet pressing mechanism 300 will be described below with reference to FIG. FIG. 7 is a block diagram showing an electrical configuration of the sheet pressing mechanism 300. In FIG. 7, the pressing control device 313 controls the first air cylinders 301A and 301B and the second air cylinders 30A and 302B. The program memory 314 stores a press control program executed by the press control device 313. The pressing control program is executed according to the flowchart shown in FIG. The work memory 315 temporarily stores a processing result when the pressing control program is executed. The pressing control device 313 is connected to the pulse generator 311 and the position detector 312 respectively. Further, the pressing control device 313 is connected to the operation switch 316. The operation switch 316 is operated by the user when the sheet pressing mechanism 300 is a cardboard sheet SH that requires a pressing operation.

  The pressing control device 313 is supplied with various control commands and production processing information from the management device 400 that manages the overall operation of the corrugated cardboard box making machine 1. For example, production processing information such as the production quantity of the corrugated cardboard sheet SH for each order and the size of the corrugated cardboard sheet in the sheet width direction is supplied to the press control device 313. Further, the press control device 313 includes a built-in counter that operates independently of the press control program. The built-in counter counts the pulse signal PS from the pulse generator 311.

<< Operation and Action of Embodiment >>
The operation and action of the sheet feeding apparatus 2 and the sheet pressing mechanism 300 according to the present embodiment will be described below with reference to FIGS.

  The corrugated cardboard box making machine 1 processes corrugated cardboard sheets having different sizes in the sheet supply direction FD and in the sheet width direction orthogonal to the sheet supply direction FD. In general, for a corrugated sheet having a small size, even if the moisture content differs between the front surface and the back surface of the sheet, or between the central portion and the peripheral portion of the sheet, the warpage of the entire sheet is reduced by the front gate. It does not appear so much as to affect the passage of However, for large corrugated cardboard sheets, particularly large and thin corrugated cardboard sheets, warpage of the entire sheet appears greatly due to the difference in moisture content at each location of the sheet. For this reason, when a large cardboard sheet is supplied, a sheet pressing operation is required to correct the warp. However, when a small cardboard sheet is supplied, the sheet pressing operation is not necessary. Further, in order to supply small-sized cardboard sheets at a high speed, it is necessary to stack a large number of cardboard sheets on the mounting table 23. Therefore, the pressing rolls 304A and 304B are retracted upward from the mounting table 23. It is preferable for the sheet to be supplied at high speed.

<Supplying small cardboard sheets>
First, a case where a small-sized cardboard sheet is supplied at high speed will be described. When the cardboard sheet box making machine 1 is powered on, the management device 400 controls the size and processing speed of the cardboard sheet SH in each order in order to execute a plurality of consecutive orders relating to a small cardboard sheet. Information is supplied to a processing apparatus such as the printing apparatus 4 and the sheet supply apparatus 2.

  In the sheet supply apparatus 2, the front gates 201A and 201B are moved and positioned in the sheet width direction in accordance with the size of the cardboard sheet SH in the sheet width direction orthogonal to the sheet supply direction FD, that is, control information indicating the sheet width. . For example, the positioning motor 228A is driven according to the control information, and moves the front gate 201A along the guide bars 223 and 224 and the screw shafts 225 and 226. The position of the front gate 201A in the sheet width direction is determined according to the rotation amount of the positioning motor 228A. Similarly, the side joggers 229 and 230 are also positioned in the sheet width direction according to the control information.

  The press control device 313 is supplied with control information from the management device 400. The press control device 313 reads and executes the press control program stored in the program memory 314 when starting execution of each order of a plurality of consecutive orders commanded by the control information. The pressing control program is executed according to the flowchart shown in FIG. Each step shown in FIG. 8 indicates processing executed by the press control device 313. In this embodiment, before the pressing control program is started, the clamp member 310A is released from tightening, and the sliding bodies 303A and 303B are free to move in the vertical direction along the front gates 201A and 201B. Yes.

  When the pressing control program is started, initial setting is performed (S1). The initial setting includes a process of resetting the contents stored in the work memory 315 and the contents of the built-in counter. For example, the sheet supply number K stored in the work memory 315 is erased and set to “0” in step S1.

  The operating rods 306A and 306B of the first air cylinders 301A and 301B are raised (S2). Further, the operating rods 307A and 307B of the second air cylinders 303A and 303B are also raised. FIG. 9 shows a state where the pressing roll 304A is in a retracted position where the corrugated cardboard sheet SH cannot be pressed. Specifically, the operating rod 306A of the first air cylinder 301A is raised, and the operating rod 307A of the second air cylinder 303A is also raised. In this raised state, the pressing rolls 304 </ b> A and 304 </ b> B are at a retreat position that is largely separated from the uppermost cardboard sheet SH of the plurality of cardboard sheets SH stacked on the placement table 23.

  The number of cardboard sheets SH stacked on the placement table 23 is set according to the execution speed of each order. A relatively large number of cardboard sheets SH are stacked on the mounting table 23 in order to supply small-size cardboard sheets SH at high speed. The number of stacked cardboard sheets SH is detected by a sheet number detector (not shown). This number detector is arranged at a position close to one of the side joggers 229 and 230. An auto feeder is disposed on the upstream side of the sheet supply apparatus 2 in order to convey the cardboard sheet toward the sheet supply apparatus 2. An auto feeder is known from Japanese Patent Application Laid-Open No. 2001-151424. Generally, the auto feeder determines whether or not the number of sheets detected by the sheet number detector is equal to or more than the minimum number according to the execution speed of each order and is within the allowable number range. When it is determined that the number is less than the allowable number of sheets, the auto feeder conveys the cardboard sheet to the sheet supply device 2 and replenishes it.

  As shown in FIG. 9, it is determined whether or not the operation switch 316 has been operated in a state where the pressing roll 304A is located at the retracted position (S3). Since the cardboard sheet SH having a small size does not require a pressing operation, the user maintains the state in which the pressing roll 304A is positioned at the retracted position without operating the operation switch 316.

  When it is determined that the operation switch 316 is not operated (S3: NO), it is determined whether or not a predetermined time has elapsed since step S2 was executed (S4). If the predetermined time has not elapsed (S4: NO), the determination in step S3 is repeated. When the predetermined time has elapsed (S4: YES), the pressing control program ends.

  In step S4, when the operation of the corrugated board box making machine 1 is started after a predetermined time has elapsed, the main drive motor 8 is driven at a speed corresponding to the processing speed of each order. By driving the main drive motor 8, the feed rolls 22A and 22B rotate at a predetermined speed in a direction indicated by an arrow in FIG. The kicker drive motor 218 is also driven at a speed corresponding to the rotational speed of the main drive motor 8. Driving the kicker drive motor 218 causes the drive pulley 213 to rotate in the direction indicated by the arrow in FIG. 2, and the rotational force is transmitted to the driven pulley 215 as the endless belt 216 moves. As a result, the upper belt portion of the endless belt 216 moves from right to left in FIG. 2 at a speed synchronized with the feed rolls 22A and 22B. Further, the supply claw portion 217 also repeatedly moves from right to left along the placement surface of the placement table 23 by the movement of the endless belt 216. In FIG. 2, the supply claw portion 217 linearly moves from right to left after passing the upper position of the driven pulley 215 until reaching the upper position of the drive pulley 213. The supply claw portion 217 contacts the rear end portion of the lowermost corrugated cardboard sheet SH among the corrugated cardboard sheets SH stacked on the mounting table 23 in the course of linear movement from right to left. The supply claw portion 217 pushes the tip end portion of the lowermost corrugated cardboard sheet SH between the feed rolls 22A and 22B through the gap between the lower end portion of the front gate 201A and the placement table 23. After the supply claw portion 217 starts the pushing operation of the rear end portion of the lowermost cardboard sheet SH, the great 203 rises and lifts the rear end portion of the other cardboard sheet SH. When the supply claw portion 217 moves below the placement table 23, the great 203 descends below the placement table 23.

  When the operation of the corrugated cardboard box making machine 1 is started, the suction blower 25 of the sheet feeding device 2 is driven to suck the lowermost corrugated cardboard sheet SH onto the placement table 23. The cardboard sheet SH having a small size has a small warp, and there is almost no gap between the lower surface of the cardboard sheet SH and the placement table 23. Therefore, the cardboard sheet in the lowest position does not get jammed due to its leading end being caught by the front gate.

  A series of sheet supply operations in which the supply claw portion 217 pushes out the rear end portion of the corrugated cardboard sheet SH and the feed rolls 22A and 22B pinch and convey the front end portion of the cardboard sheet SH are repeatedly executed. The sheet feeding operation of the small corrugated cardboard sheet SH is executed without being pressed by the pressing rolls 304A and 304B.

<Supplying large cardboard sheets>
Next, a case where a large cardboard sheet SH is supplied will be described. A large corrugated cardboard sheet SH tends to warp in various directions throughout the sheet. For example, a downward warping phenomenon in which the central portion of the sheet bulges downward and the peripheral portion bends upward, an upward bending phenomenon in which the central portion of the sheet bulges upward and the peripheral portion bends downward, or an S-shape in which the entire sheet is bent in an S shape. The warping phenomenon occurs in various shapes such as the warping phenomenon. These warping phenomena occur not only in the sheet supply direction but also in the sheet width direction orthogonal to the sheet supply direction. For this reason, when supplying a large corrugated cardboard sheet, the leading edge of the corrugated cardboard sheet may interfere with the front gate due to the warp of the sheet, and a paper jam may occur. Therefore, the pressing operation by the pressing rolls 304A and 304B is not performed. Necessary.

  In order to execute a plurality of consecutive orders relating to a large corrugated cardboard sheet, the management apparatus 400 provides control information such as the size and processing speed of the corrugated cardboard sheet SH in each order, a processing apparatus such as the printing apparatus 4, and a sheet supply apparatus. 2 is supplied.

  In the sheet supply apparatus 2, the front gates 201A and 201B are moved and positioned in the sheet width direction according to control information representing the sheet width of the corrugated cardboard sheet SH. The side joggers 229 and 230 are also positioned in the sheet width direction according to the control information.

  The press control device 313 is supplied with control information from the management device 400. The press control device 313 reads and executes the press control program stored in the program memory 314 when starting execution of each order of a plurality of consecutive orders commanded by the control information. Before the pressing control program is started, the clamping of the clamp member 310A is released, and the sliding bodies 303A and 303B are free to move in the vertical direction along the front gates 201A and 201B.

  When the pressing control program is started, initial setting is performed (S1). In the initial setting, the sheet supply number K stored in the work memory 315 is erased and set to “0”.

  As shown in FIG. 9, the operating rods 306A and 306B of the first air cylinders 301A and 301B are raised (S2). Further, the operating rods 307A and 307B of the second air cylinders 303A and 303B are also raised. In this raised state, the pressing rolls 304 </ b> A and 304 </ b> B are at a retreat position that is largely separated from the uppermost cardboard sheet SH of the plurality of cardboard sheets SH stacked on the placement table 23.

  It is determined whether or not the operation switch 316 has been operated in a state where the pressing rolls 304A and 304B are positioned at the retracted position (S3). Since the pressing operation of the pressing rolls 304 </ b> A and 304 </ b> B is necessary to supply the large-sized cardboard sheet SH, the user operates the operation switch 316. By this operation, it is determined that the operation switch 316 has been operated (S3: YES), and the process proceeds to step S5.

  The operating rods 306A and 306B of the first air cylinders 301A and 301B are lowered (S5). At this time, the operating rods 307A and 307B of the second air cylinders 303A and 303B are maintained in the raised state. Specifically, the operating rod 306A of the first air cylinder 301A protrudes downward by a predetermined stroke, and the operating rod 307A of the second air cylinder 302A is in a raised state. FIG. 10 shows a use position where the operating rod 306A of the first air cylinder 301A protrudes and the pressing roll 304A can press the cardboard sheet SH, that is, if the operating bar 306A descends, the cardboard sheet SH can be pressed. The state in the separated position PU which is a possible position is shown. Similarly, the operating rod 306B of the first air cylinder 301B protrudes and the operating rod 307B of the second air cylinder 303B is maintained in the raised state.

(Pressing roll position adjustment)
The number of cardboard sheets SH stacked on the placement table 23 is the number corresponding to the processing speed of the cardboard sheets SH in a plurality of consecutive orders. The vertical positions of the pressing rolls 304A and 304B that are in contact with the uppermost corrugated cardboard sheet SH need to be adjusted and set according to the number of stacked sheets. The user determines the vertical positions of the sliding bodies 303A and 303B with respect to the mounting table 23 so that the larger the number of stacked sheets, the higher the positions of the pressing rolls 304A and 304B. The positions of the pressing rolls 304A and 304B are set by tightening.

(Pressing action of pressing roll)
The pressing operation of the pressing rolls 304A and 304B will be described with reference to FIGS. 10 and 11 show only the pressing roll 304A, but FIG. 10 shows a state where the pressing roll 304A is at a separation position PU separated from the plurality of cardboard sheets SH on which the pressing roll 304A is stacked, and FIG. The state which exists in the press position PD which presses the some cardboard sheet | seat SH made is shown. FIG. 12 shows the generation of the pulse signal PS, the generation of the detection signal DS, the positional change HPR of the pressing rolls 304A and 304B from the mounting table 23, the positional changes PSH1 to SH3 of the rear end portion of the lowermost cardboard sheet, The position change PKC of the supply nail | claw part 217 is shown according to progress of time.

  After the position adjustment of the pressing rolls 304A and 304B is completed, when the operation of the corrugated board box making machine 1 is started at the time TS shown in FIG. 12, the main drive motor 8 is driven at a speed corresponding to the processing speed of each order. Then, the feed rolls 22A and 22B rotate at a predetermined speed. The kicker drive motor 218 is also driven at a speed corresponding to the rotational speed of the main drive motor 8, and the drive pulley 213 and the driven pulley 215 rotate. Endless belt 216 and supply claw portion 217 move at a speed synchronized with feed rolls 22A and 22B.

  The suction blower 25 of the sheet supply device 2 is driven by starting the operation of the corrugated cardboard box making machine 1 and sucks the lowermost corrugated cardboard sheet SH to the placement table 23. Since the corrugated sheet SH having a large size has a large warp and a gap is formed between the lower surface of the corrugated cardboard sheet SH and the mounting table 23, the suction portion of the lowermost corrugated cardboard sheet SH can be formed only by the suction force of the suction blower 25. The warp is not completely corrected, and sometimes it is in a state of being bent upward in front of the front gates 201A and 201B.

  When the supply claw portion 217 moves and passes below the position detector 312 by driving the kicker drive motor 218, the position detector 312 is affixed in the vicinity of the supply claw portion 217 at time T11 shown in FIG. A mark is detected and a detection signal DS is generated.

  It is determined whether or not the detection signal DS is generated (S6). If it is determined that the detection signal DS is not generated (S6: NO), the determination in step S6 is repeated. If it is determined that the detection signal DS has been generated (S6: YES), the process proceeds to step S7.

  A count start command is generated so that the built-in counter starts counting the pulse signal PS from the pulse generator 311 (S7). When the kicker drive motor 218 is driven from the time point TS shown in FIG. 12, the pulse generator 311 generates a pulse signal PS as the motor 218 rotates.

  It is determined whether or not the content of the built-in counter has reached a predetermined set value (Pa + Pt × K) (S8). The value Pa is a predetermined value, and after the detection signal DS is generated at the time T11 shown in FIG. 12, until the pressing rolls 304A and 304B start to descend for the pressing operation at the time T12 shown in FIG. Represents the number of pulses of the pulse signal PS generated during The value Pt is the number of pulses of the pulse signal PS generated from when the detection signal DS is generated until the next detection signal DS is generated as shown in FIG. 12, that is, while the endless belt 216 moves for one cycle. Represent. The value K represents the number of corrugated cardboard sheets SH to be supplied. Since the value K is set to “0” by the initial setting in step S1, the predetermined set value is the value Pa when step S8 is executed for the first time from the start of the pressing control program.

  If it is not determined that the content of the built-in counter has reached a predetermined set value (S8: NO), the determination in step S8 is repeated. When it is determined that the content of the built-in counter has reached a predetermined set value (S8: YES), the process proceeds to step S9.

  The operating rods 307A and 307B of the second air cylinders 302A and 302B are lowered (S9). Specifically, when the operating rods 307A and 307B of the second air cylinders 302A and 302B are lowered at time T12 shown in FIG. 12, the pressing rolls 304A and 304B are lowered from the separation position PU shown in FIG. Then, it moves to the pressing position PD shown in FIG. Before the pressing rolls 304 </ b> A and 304 </ b> B descend, the auto feeder conveys the cardboard sheets SH to the sheet supply device 2, and a plurality of cardboard sheets SH are stacked on the placement table 23. The front end portion of the stacked corrugated cardboard sheet SH is pressed by the main pressing rolls 304A1 and 304B1 immediately upstream of the front gates 201A and 201B, and at the position close to both side ends extending in the sheet supply direction. It is pressed by 304A2 and 304B2. By this pressing, the warp of the front end portion of the corrugated cardboard sheet SH is temporarily corrected, and the front end portion of the lowermost corrugated cardboard sheet SH is attracted to the mounting table 23 by the suction force of the suction blower 25 and is in close contact with it. become. The state where the leading end portion of the corrugated board sheet SH is in close contact is maintained until at least the leading end portion of the corrugated board sheet SH is pushed out from the front gates 201A and 201B by the supply claw portion 217.

  It is determined whether or not the content of the built-in counter has reached a predetermined set value (Pb + Pt × K) (S10). The value Pb is a predetermined value, and after the detection signal DS is generated at the time T11 shown in FIG. 12, the pressing rolls 304A and 304B are raised to stop the pressing operation at the time T13 shown in FIG. This represents the number of pulses of the pulse signal PS generated until the start. Since the value K is set to “0” by the initial setting in step S1, when step S10 is executed for the first time from the start of the pressing control program, the predetermined setting value is the value Pb.

  If it is not determined that the content of the built-in counter has reached a predetermined set value (S10: NO), the determination in step S10 is repeated. When it is determined that the content of the built-in counter has reached a predetermined set value (S10: YES), the process proceeds to step S11.

  The operating rods 307A and 307B of the second air cylinders 302A and 302B are raised (S11). Specifically, when the operation rods 307A and 307B of the second air cylinders 302A and 302B are raised at time T13 shown in FIG. 12, the pressing rolls 304A and 304B are raised from the pressing position PD shown in FIG. , And moves to the separation position PU shown in FIG. Even when the pressing rolls 304 </ b> A and 304 </ b> B are lifted and the pressing operation is stopped, the suction portion of the suction blower 25 can maintain the tip portion of the lowermost corrugated cardboard sheet SH in close contact with the mounting table 23. .

  Supply claw portion 216 moves according to position change PKC indicated by a broken line in FIG. When the supply claw portion 216 reaches the arrangement position PR of the back guide 202 at time T14 shown in FIG. 12, it contacts the rear end portion of the lowermost cardboard sheet SH and pushes the rear end portion in the sheet supply direction FD. be able to. As a result, the tip end portion of the lowermost corrugated cardboard sheet SH can pass through the front gates 201 </ b> A and 201 </ b> B and the mounting table 23 without being caught while being in close contact with the mounting table 23. The leading end portion of the cardboard sheet SH passes through the front gates 201A and 201B, and is then sandwiched and conveyed by the feed rolls 22A and 22B. The rear end portion of the corrugated board sheet SH passes through the arrangement position PF of the front gates 201A and 201B at time T15 shown in FIG. In FIG. 12, the movement of the rear end portion of the first corrugated cardboard sheet SH is indicated by a position change PSH1.

  It is determined whether or not the order is completed (S12). Each order of a plurality of consecutive orders executes the processing of the cardboard sheet SH by the number of processings planned in advance. The determination in step S12 is performed by determining whether or not the sheet supply number K of the actually supplied cardboard sheets SH has reached the number of processed sheets of each order. If it is not determined that the order has been completed (S12: NO), the process proceeds to step S13.

  The sheet supply number K is incremented by “1” (S13). After this increment, the process proceeds to step S14. By this increment, the sheet supply number K is set to “1”.

  It is determined whether or not the detection signal DS is generated (S14). If it is determined that the detection signal DS is not generated (S14: NO), the determination in step S14 is repeated. If it is determined that the detection signal DS has been generated (S14: YES), the process returns to step S8. When the detection signal DS is generated at time T21 shown in FIG. 12, it is determined that the detection signal DS has been generated, and step S8 is executed. After that, when the rear end portion of the cardboard sheet SH passes through the front gates 201A and 201B at time T15 shown in FIG. 12, the operation for supplying the first cardboard sheet SH is completed.

  It is determined whether or not the content of the built-in counter has reached a predetermined set value (Pa + Pt × K) (S8). In this determination, since the sheet supply number K is set to “1” in step S13, the predetermined set value is a value (Pa + Pt).

  When it is determined that the content of the built-in counter has reached a predetermined set value (S8: YES), the operating rods 307A and 307B of the second air cylinders 302A and 302B are lowered (S9). Specifically, when the operating rods 307A and 307B of the second air cylinders 302A and 302B descend at time T22 shown in FIG. 12, the pressing rolls 304A and 304B move from the separation position PU to the pressing position PD. . Before the pressing rolls 304 </ b> A and 304 </ b> B descend, the auto-feeder transports and replenishes one cardboard sheet SH to the sheet supply device 2. The front end portion of the stacked cardboard sheets SH is pressed by the main pressing rolls 304A1 and 304B1 at a position close to the central portion immediately upstream of the front gates 201A and 201B, and the sub pressing roll 304A2 at a position close to both end portions. , 304B2. As a result, the warp phenomenon in the sheet width direction of the corrugated cardboard sheet SH is corrected, and the tip end portion of the lowermost corrugated cardboard sheet SH is attracted to the placement table 23 by the suction action of the suction blower 25 and comes into close contact. .

  It is determined whether or not the content of the built-in counter has reached a predetermined set value (Pb + Pt × K) (S10). In this determination, since the sheet supply number K is set to “1” in step S13, the predetermined set value is a value (Pb + Pt).

  When it is determined that the content of the built-in counter has reached a predetermined set value (S10: YES), the operating rods 307A and 307B of the second air cylinders 302A and 302B are raised (S11). Specifically, when the operating rods 307A and 307B of the second air cylinders 302A and 302B are raised at time T23 shown in FIG. 12, the pressing rolls 304A and 304B move from the pressing position PD to the separation position PU. . Even when the pressing rolls 304A and 304B are raised and the pressing operation is stopped, the tip end portion of the lowermost corrugated cardboard sheet SH is sucked by the suction action of the suction blower 25 and remains in close contact with the mounting table 23. can do.

  When the supply claw portion 217 reaches the arrangement position PR of the back guide 202 at the time T24 shown in FIG. 12, it contacts the rear end portion of the lowermost cardboard sheet SH. Since the tip of the lowermost corrugated cardboard sheet SH is in close contact with the mounting table 23, it can pass between the front gates 201A and 201B and the mounting table 23 without being caught. The leading end portion of the cardboard sheet SH passes through the front gates 201A and 201B, and is then sandwiched and conveyed by the feed rolls 22A and 22B. The rear end portion of the corrugated board sheet SH passes through the arrangement position PF of the front gates 201A and 201B at time T25 shown in FIG. In FIG. 12, the movement of the rear end portion of the second corrugated cardboard sheet SH is indicated by a position change PSH2.

  It is determined whether or not the order is completed (S12). If it is not determined that the order has been completed (S12: NO), the sheet supply number K is incremented by "1" (S13). After this increment, the process returns to step S8. By this increment, the sheet supply number K is set to “2”. At time T25 shown in FIG. 12, the supply operation of the second cardboard sheet SH is completed.

  Similarly, the pressing operation and the supply operation of the third and subsequent corrugated cardboard sheets SH are repeated, and when the sheet supply number K reaches the number of processed sheets of each order, it is determined that the order is completed (S12: YES). After this determination, the press control program ends for one order.

  Before executing the next order, the user needs to release the clamping of the clamp member 310A in preparation for the raising of the operating rods 306A, 306B of the first air cylinders 301A, 301B in step S2. However, if it is not necessary to adjust the position of the pressing rolls 304A and 304B in the vertical direction in each of a plurality of consecutive orders, the user keeps the clamp member 310A untightened. When the clamp member 310A is not tightened, the first air cylinders 301A and 301B need to be operated at a predetermined air pressure so that the protruding state can be maintained even when the operating rods 306A and 306B are pressed.

[Modification]
The embodiment of the present invention has been described above, but various modifications can be made by those skilled in the art without departing from the spirit of the present invention.

(1) In the sheet supply apparatus 2 of the present embodiment, the belt kicker mechanism 21 is used as the supply operation unit, and the supply claw unit 217 circulates once by the movement of the endless belt 216 in the feeding operation cycle. In this period, the pulse signal PS is generated by the number of pulses Pt as shown in FIG. As a kicker mechanism other than the belt kicker mechanism, a configuration may be adopted in which the kicker is moved forward and backward through the operating means by the rotation of the main shaft shown in Patent Document 1. In this kicker mechanism, one forward and backward movement of the kicker corresponds to a cycle of the feeding operation. Moreover, it may replace with the structure of these kicker mechanisms, and a supply action | operation part may be a delivery roll mechanism which has several delivery rolls. When this delivery roll mechanism is used, the delivery operation cycle of the supply operation unit is a cycle in which the receiving plate moves up and down only once in order to bring the plurality of delivery rolls into contact with or away from the lower surface of the cardboard sheet. The delivery roll mechanism is known from Japanese Utility Model Publication No. 8-5963.

(2) In the sheet pressing mechanism 300 of the present embodiment, the pressing rolls 304A and 304B are configured such that the supply claw 217 reaches the arrangement position PR of the back guide 202 after the detection signal DS is generated, as shown in FIG. The structure is such that the corrugated cardboard sheet is pressed for a relatively long pressing period TP until just before the process. However, the present invention is not limited to this configuration, and the suction blower 25 and the like are temporarily corrected after the warp of the lowermost corrugated cardboard sheet, particularly the sheet portion near the front gates 201A and 201B, is temporarily corrected. The supply claw portion 217 is positioned at the position PR of the back guide 202 if the tip end portion of the lowermost corrugated cardboard sheet is sucked to the placement table 23 by the suction mechanism including The configuration may be such that the pressing rolls 304A and 304B press the corrugated cardboard sheet SH only for a short period before reaching.

(3) In the sheet pressing mechanism 300 of this embodiment, after the supply claw portion 217 contacts the rear end portion of the lowermost cardboard sheet SH, the rear end portion of the cardboard sheet SH passes through the front gates 201A and 201B. In the period until the pressing, the pressing rolls 304A and 304B are configured not to rise from the pressing position PD and press the cardboard sheet. However, the present invention is not limited to this configuration. If the sheet supply operation of the lowermost corrugated cardboard sheet SH is not hindered, the rear end portion of the corrugated cardboard sheet SH has not yet passed through the front gates 201A and 201B. The pressing rolls 304A and 304B may be configured to descend to the pressing position PD and press the cardboard sheet. For example, when the conveying force of the feed rolls 22A and 22B is large, even if the pressing rolls 304A and 304B press the cardboard sheet SH, the sheet supply operation is not hindered. Increasing the pressing period TP of the pressing operation by the pressing rolls 304A and 304B is effective in correcting the warp phenomenon of the plurality of cardboard sheets SH stacked above the lowermost cardboard sheet SH.

(4) In the sheet pressing mechanism 300 of this embodiment, the first air cylinders 301A and 301B operate to switch the pressing rolls 304A and 304B between the use position and the retracted position, and the second air cylinders 302A and 302B. However, this is a configuration that operates to selectively place the pressing rolls 304A and 304B at the pressing position PD and the separation position PU. However, the present invention is not limited to this configuration, and the vertical strokes of the operating rods 307A, 307B of the second air cylinders 302A, 302B are long, and the operating rod can be moved up and down at high speed. For example, a configuration including only the second air cylinder without using the first air cylinder may be employed.

(5) In the sheet pressing mechanism 300 of the present embodiment, the pressing force of the corrugated cardboard sheet SH by the second air cylinders 302A and 302B is determined regardless of the type and size of the corrugated cardboard sheet SH processed in each order. . However, the present invention is not limited to this configuration, and the pressing force of the cardboard sheet SH by the second air cylinders 302A and 302B is controlled to be automatically adjusted according to the type or size of the cardboard sheet of each order. It may be configured.

(6) The sheet pressing mechanism 300 of the present embodiment has a configuration in which the pulse generator 311 and the position detector 312 synchronize the corrugated sheet feeding operation cycle and the pressing operation. However, the present invention is not limited to this configuration, and the configuration is such that the pressing operation and the feeding operation are operated with a certain temporal relationship so that the pressing operation is executed at a fixed time that does not interfere with the feeding operation. Any configuration may be used. For example, the vertical movement of the pressing rolls 304A and 304B and the sheet feeding movement of the supply claw portion 217 are generated by converting the driving force from one driving motor by a mechanical mechanism such as a cam and a lever. It may be a configuration.

DESCRIPTION OF SYMBOLS 1 Corrugated cardboard box making machine 2 Sheet supply device 4 Printing device 21 Belt kicker mechanism 25 Suction blower 23 Loading table 201A, 201B Front gate 300 Sheet pressing mechanism 301A, 301B First air cylinder 302A, 302B Second air cylinder 303A , 303B Slider 304A, 304B Press roll 304A1, 304B1 Main press roll 304A2, 304B2 Sub press roll 310A Clamp member PU Separation position PD Press position FD Sheet supply direction SH More than corrugated cardboard sheet

Claims (6)

A sheet supply device in a corrugated cardboard box making machine including a processing device that performs processing such as printing and ruled lines on a corrugated cardboard sheet,
A mounting table on which a plurality of cardboard sheets are stacked;
The cardboard sheet is positioned on the downstream side of the placement table in the sheet supply direction in which the cardboard sheet is supplied toward the processing device, and at an interval that allows the lowermost cardboard sheets to pass through the plurality of stacked cardboard sheets, A front gate disposed above the table,
A conveyance unit that is located downstream of the front gate in the sheet supply direction and conveys the corrugated board sheet that has passed through the front gate toward the processing device;
A supply actuating section for sending the lowermost corrugated cardboard sheets of the plurality of stacked cardboard sheets from the front gate in the sheet supply direction;
In order to press the stacked cardboard sheets from above at a position close to the front gate, the pressing body is supported so as to be movable up and down, and is pressed in synchronization with the feeding operation cycle of the supply operation unit. A sheet pressing mechanism that performs the operation ,
The front gate is supported so as to be movable in a direction orthogonal to the sheet supply direction,
The pressing body is a sheet feeding device supported by the front gate so as to be movable up and down . The sheet pressing mechanism includes a pressing drive unit that lowers the pressing body so that the pressing body presses the stacked cardboard sheets.
The pressing drive unit is configured such that when the rear end portion of the lowermost cardboard sheet of the plurality of stacked cardboard sheets reaches the front gate, the supply operation unit is the most of the plurality of cardboard sheets stacked. 2. The sheet feeding apparatus according to claim 1, wherein a sheet leading end portion of the plurality of stacked cardboard sheets is pressed against the pressing body in a predetermined period until a time point at which a lower corrugated sheet feeding operation is started.   3. The sheet feeding apparatus according to claim 1, further comprising a suction mechanism disposed below the placement table for sucking the plurality of stacked cardboard sheets downward. 4. A plurality of the front gate and the pressing body are provided,
4. The sheet feeding apparatus according to claim 1, wherein the plurality of pressing bodies are respectively supported by the plurality of front gates supported so as to be movable in a direction orthogonal to the sheet feeding direction. A sheet supply device in a corrugated cardboard box making machine including a processing device that performs processing such as printing and ruled lines on a corrugated cardboard sheet,
A mounting table on which a plurality of cardboard sheets are stacked;
The cardboard sheet is positioned on the downstream side of the placement table in the sheet supply direction in which the cardboard sheet is supplied toward the processing device, and at an interval that allows the lowermost cardboard sheets to pass through the plurality of stacked cardboard sheets, A front gate disposed above the table,
A conveyance unit that is located downstream of the front gate in the sheet supply direction and conveys the corrugated board sheet that has passed through the front gate toward the processing device;
A supply actuating section for sending the lowermost corrugated cardboard sheets of the plurality of stacked cardboard sheets from the front gate in the sheet supply direction;
In order to press the stacked cardboard sheets from above at a position close to the front gate, the pressing body is supported so as to be movable up and down, and is pressed in synchronization with the feeding operation cycle of the supply operation unit. A sheet pressing mechanism that performs the operation,
The sheet pressing mechanism, the sheet feeding apparatus having a position adjusting section that the pressing member is a pressing position for pressing the plurality of cardboard sheets the loading, adjusted for placement surface of the placement table. A sheet supply device in a corrugated cardboard box making machine including a processing device that performs processing such as printing and ruled lines on a corrugated cardboard sheet,
A mounting table on which a plurality of cardboard sheets are stacked;
The cardboard sheet is positioned on the downstream side of the placement table in the sheet supply direction in which the cardboard sheet is supplied toward the processing device, and at an interval that allows the lowermost cardboard sheets to pass through the plurality of stacked cardboard sheets, A front gate disposed above the table,
A conveyance unit that is located downstream of the front gate in the sheet supply direction and conveys the corrugated board sheet that has passed through the front gate toward the processing device;
A supply actuating section for sending the lowermost corrugated cardboard sheets of the plurality of stacked cardboard sheets from the front gate in the sheet supply direction;
In order to press the stacked cardboard sheets from above at a position close to the front gate, the pressing body is supported so as to be movable up and down, and is pressed in synchronization with the feeding operation cycle of the supply operation unit. A sheet pressing mechanism that performs the operation,
The sheet pressing mechanism is
A movable support supported to be movable up and down;
A first driving unit fixed to the movable support for moving the pressing body up and down between a pressing position and a separation position with respect to the stacked cardboard sheets;
A second drive unit for lowering or raising the movable support body between a use position where the pressing body can perform a pressing operation and a retracted position where the pressing body cannot perform a pressing operation; sheet feeding apparatus further comprising a.

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