JP2592269B2 - Kicker origin return control method for paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kicker origin return control method for a sheet feeder, and more specifically, an expensive deceleration mechanism conventionally required for adjusting the origin of a kicker can be omitted. The present invention relates to a control method for reducing the manufacturing cost and eliminating the necessity of disconnecting the downstream paperwork unit each time the origin is adjusted, so that the kicker can be returned to the origin in a short time and efficiently. It is.

2. Description of the Related Art Various types of paperwork units that apply various processes such as cutting, folding, and printing to paper sheet materials are known. For example, in a line for processing a corrugated cardboard sheet cut to a predetermined standard size, a complex machine called "flexo die cut slotter" in which various paper processing units are connected in series is employed. As shown in FIG. 5, the flexo die-cut slotter is provided with a corrugated cardboard sheet at the most upstream side.
A paper feeder 10 that supplies the sheets 22 to the downstream side one by one is provided,
Downstream of the paper feeder 10, a plurality of flexographic printing presses 1
2, Creaser slotter unit 14, Die cut unit 16
And other paperwork units are arranged in series.

The present invention relates to an improvement of a paper feeder related to the above-mentioned various paper processing units, particularly to an improvement of a paper feeder employing a kicker system. First, an outline of the paper feeder will be described with reference to FIG. Will be explained. The illustrated paper feeding device 10 includes:
Paper feed table 20 capable of loading a large number of cardboard sheets 22
And the corrugated cardboard sheet 22 loaded on the paper feed table 20,
A kicker 24 is provided that can reciprocate so as to be kicked and supplied one by one from the bottom to the downstream side. That is, a rotary shaft 30 is horizontally supported by a machine frame 26 of the sheet feeding device 10 via a bearing 28, and a large-diameter spur gear 32 is fixed to one end of the rotary shaft 30. The spur gear 32 is rotatably pivotally mounted at a position eccentric with respect to the rotation shaft 30 with a slider 34 composed of a rotating roll.
36 is slidably fitted. The other end of the rotating shaft 30 has a detection piece 38 for detecting the origin on the outer peripheral surface.
The disc 40 (having an operation described later) provided with the fixing member is fixed to the disc 40 so that the disc 40 can rotate integrally.

A swinging shaft 42 is pivotally supported on the machine frame 26 in parallel with the rotating shaft 30 at a required center angle, and a slider guide 36 extending in the radial direction is fixed to one end of the swinging shaft 42. I have. A slider 34 eccentrically mounted on the spur gear 32 is slidably fitted in a guide groove 36a formed in the slider guide 36. Further, a plurality of crank arms 44 are fixed to the swing shaft 42 at required intervals, and the tip of each crank arm 44 is a lower end of the kicker 24 facing a guide groove 20a formed on the upper surface of the sheet feeding table 20. Are connected to each other via a connecting rod 46.

Therefore, the spur gear is driven by the power from the drive motor described later.
When the 32 is rotated, the slider 34 is eccentrically rotated with respect to the rotating shaft 30 while being guided by the guide groove 36a, and imparts a swinging motion at the required center angle to the swinging shaft 42. This swinging motion is converted into a horizontal reciprocating linear motion of the kicker 24 by the crank arm 44 and the connecting rod 46, and
The lowermost sheet 22 of the many corrugated cardboard sheets 22 stacked on the sheet is kicked out downstream by the kicker 24 and supplied to the flexographic printing press 12.

In addition, on the downstream side of the sheet feeding table 20, a cardboard sheet is provided.
In a vertical relationship across the push line 1 that sends out 22 horizontally,
A pair of sheet delivery rolls 48 and 50 are disposed, and a small-diameter spur gear 56 provided on the driving side (the right side in FIG. 4) of the rotation shaft 54 of the lower delivery roll 50 is attached to the machine frame 26. It meshes with the main gear 60 via the pivoted intermediate gear 58. This main gear
60 has a large-diameter V pulley 62 coaxially and has a large direct current (D
C) A plurality of V-belt groups 68 are stretched between the small V-pulley 66 fixed to the rotating shaft of the motor 64 and the V-pulley 62, and the power of the motor 64 is sent out to the sheet roll 50. It can be transmitted. This direct current (DC) motor 64
It serves as a common drive source for various paper processing units from the sheet feeding device 10 to the die cut unit 16 via a series of gear trains to be described later, and its output is set to be sufficiently large.

Small-diameter spur gears 70 and 72 are provided on the operation side (the left side in FIG. 4) of the rotating shafts 52 and 54 of the pair of sheet sending rolls 48 and 50, respectively. 48,
50 can be rotated in the reverse direction (sheet feeding direction). The spur gear 72 provided on the lower delivery roll 50 meshes with the large-diameter spur gear 32 to give the kicker 24 a horizontal linear reciprocating motion as described above. Further, a spur gear 70 provided on the upper delivery roll 48 is provided.
Is engaged with a large-diameter gear 76 provided coaxially with a plate cylinder (not shown) of the flexographic printing press 12 disposed downstream of the sheet feeding device 10 via the intermediate gear 74, and The printing machine 12 is driven. The rotation of the large-diameter gear 76 is further transmitted to the creaser slotter unit 14 and the die cut unit 16 via a series of gear trains shown in FIG. 5, and in that sense, the direct current (DC) The motor 64 is a common drive source for various paper processing units. As described above, the power from the direct current (DC) motor 64 is transmitted to the series of paper processing units via the gear train, and the power cutoff of the specific unit is performed.
This is achieved by moving the unit relative to the upstream unit and separating it.

As described above, the printing unit 12, the creaser slotter unit 14, and the die cut unit
In a paper processing apparatus in which 16 or the like are arranged in series, corrugated cardboard sheets 22 having various dimensional standards according to the specifications of the user are used as processing targets. In this case, as described above, when the sheet feeding device 10 relating to the mechanism for kicking out the cardboard sheet 22 toward the downstream paper processing unit by the kicker 24 is incorporated, the cardboard sheet 22 set on the sheet feeding table 20 is installed.
It is necessary to adjust the position where the back guide (not shown) is most retracted on the table 20 according to the dimension length in the feeding direction.

That is, the cardboard sheet 22 on the paper feed table 20 is
The rear end of the sheet 22 is kicked by the kicker 24 and sent to the downstream side. At this time, the foremost part of the sheet 22 is bitten by the pair of sheet sending rolls 48 and 50 and transferred further downstream. It is. For this reason, it is required that the foremost part of the corrugated cardboard sheet 22 kicked out by the kicker 24 always properly arrives at the nip portion of the rolls 48, 50. Accordingly, the most appropriate position of the maximum retreat position of the back guide provided on the kicker 24 is set in advance in accordance with the dimensional length (in the sending direction) of the corrugated cardboard sheet 22 to be fed in that order.

However, if the dimensional length of the sheet 22 used in the previous order is different from the dimensional length of the sheet 22 used in the next order (both in the sending direction), The maximum retreat position naturally also differs. Therefore, in this case, the back guide provided on the kicker 24 is adjusted by a screw adjusting mechanism (not shown) so as to conform to the dimensional length of the sheet 22 used in the next order.

The kicker 24 reciprocates under the paper feed table 20.
The stroke length itself is constant even if the dimension length of the sheet 22 is changed, as long as the combination of the slider 34 and the slider guide 36 is used. Then, as means for returning the kicker 24 to its last retreat position (“origin position”),
As shown in FIG. 4, the conventional paper feeder 10 employs a kicker origin return mechanism including a speed reduction mechanism having a high reduction ratio and having a one-way clutch.

That is, the motor frame 26 is provided adjacent to the large-diameter spur gear 32, and is provided with a motor 78 for return to origin provided with a speed reducer having a high reduction ratio.
The rotation shaft 80 is connected to a one-way clutch 82, and a small-diameter gear 86 fixed to an output shaft 84 of the clutch 82 meshes with the spur gear 32. When the paper feeder 10 and a series of paper processing units are operated at a constant speed, the one-way clutch 82 is disengaged, and the small-diameter gear 86 is free to rotate with respect to the rotation of the spur gear 32. .

Next, when returning the kicker 24 to the origin, the motor 78 dedicated to the origin return is rotated at an extremely small speed.
At this time, since the one-way clutch 82 is engaged by an input from the motor 78 side, the output shaft 84 of the clutch 82
The small-diameter gear 86 fixed to the start of rotation in a required direction starts. Accordingly, the large-diameter spur gear 32 meshing with the small-diameter gear 86 is rotated, and the swing shaft 42 is swung under the guiding action between the slider 34 and the guide groove 36a, thereby the crank arm
The kicker 24 connected to 44 is linearly moved on the paper feed table 20 toward the origin. At this time, large diameter spur gear
Together with 32, the disc 40 rotates integrally, the proximity sensor 88 detects the detected piece 38 provided at a required position on the outer peripheral surface, detects that the kicker 24 has reached the home position, and returns to the home position. The rotation of the motor 78 is stopped.

However, since this kicker origin return mechanism needs to be installed independently of the direct current (DC) motor 64 serving as the common drive source, the manufacturing cost is increased as a whole, and the space for installing the moving mechanism is added. However, there is a disadvantage that it is required separately. In addition, since the output of the dedicated motor 78 constituting the kicker origin return mechanism described above is generally small, it is pointed out that when the die cut unit 16 having a large load is connected to the downstream side of the sheet feeding device 10, rotation becomes impossible. You. That is,
A series of paper processing units are connected to the paper feeder 10 via a gear train shown in FIG. 5, and when the dedicated motor 78 is driven to return the kicker 24 to the origin, power is also transmitted to the gear train. Will be done.

However, as described above, when the die-cut unit 16 having a large load is connected to the downstream side of the sheet feeding device 10, the output of the dedicated motor 78 cannot drive the gear train. For this reason, at the time of home position return adjustment, a complicated operation of separating the paper processing unit (for example, the die cut unit 16) on the high load side from other units is required, which causes a significant reduction in work efficiency.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problem inherent in returning the origin of the kicker in the above-described kicker-type sheet feeding device, and has been proposed to appropriately solve the problem. No need for a kicker origin return mechanism equipped with a mechanism, control can be performed only with a motor as a commonly used common drive source, so that overall manufacturing costs can be reduced and mounting space for the mechanism can be reduced. It is an object of the present invention to provide a new control method that can return to the origin of a kicker without disconnecting a high-load paperwork unit such as a die-cut unit, even if the unit is connected.

Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the kicker home position return control method according to the present invention comprises the steps of: A paper feeder equipped with a reciprocable kicker that kicks out one sheet at a time and supplies it to the downstream side, and various types of printing units, creaser slotter units, die-cut units, etc., arranged in series downstream of this paper feeder A paper processing unit, and supplies the power of a motor as a common drive source built in the paper feeder to each of the paper processing units via a series of gear trains, and to the origin, which is the last retreat point of the kicker. At the time of return, in a paper processing apparatus in which the rotation speed of the motor is switched to an extremely low rotation speed as compared with the time of steady operation to return the kicker to the origin, The rotation speed of the motor is switched to the first rotation speed which is sufficiently lower than the rotation speed in the steady operation, and the kicker is moved to the vicinity of the origin position. Second
The first rotation speed of the motor is switched to a lower second rotation speed, and the arrival of the kicker at the home position is detected by the first rotation speed.
And the control is performed to stop the rotation of the motor.

Next, a kicker origin return control method for a sheet feeding apparatus according to the present invention will be described below in relation to a preferred apparatus for implementing the method. The paper feeder 10 in which the method according to the present invention is carried out is provided on the most upstream side of the above-mentioned flexo die-cut slotter, and the basic configuration is as described with reference to FIGS. 4 and 5. However, the paper feeder 10 is not provided with the independent kicker home position return mechanism including the one-way clutch and the home position return dedicated motor as described above. In the method of the present invention, in the direct current (DC) motor 64 serving as a common drive source of various paper processing units from the sheet feeding device 10 to the die cutting unit 16, a wide range of rotation speed control from a high rotation region to a very low rotation region is performed. Is performed, the kicker origin return is preferably achieved.

As described above, in order to cover the rotation speed of the direct current (DC) motor 64 serving as a common drive source in a wide range from high-speed rotation during steady operation to fine-speed rotation for moving the kicker 24 to the origin, the motor 64 is used. Is equipped with a DC tach generator in place of the conventional AC tach generator, thereby responding to the above demand. For example, this direct current (DC)
It is preferable that the motor 64 can perform speed control over a wide range and perform control using a thyristor leonard system, which is superior in terms of adaptability and efficiency. FIG. 3 shows, as an example, a schematic diagram of a thyristor leonard system according to a digital control method.

That is, the speed of the direct current (DC) motor 64 is detected by the DC tacho generator 90, and the current speed value is input to the microcomputer 92. Further, the current value (instantaneous value) of the current in the AC power supply is detected by the AC device CT, and the instantaneous current value digitally converted by the A / D converter 94 is input to the microcomputer 92. The microcomputer 92 performs calculations for speed control and current control, and determines a control angle in the thyristor forward conversion device 96. Then, the generation timing of the pulse that matches the determined control angle is determined while synchronizing with the AC power supply, and the pulse is generated at that timing. After this pulse is shaped and amplified, it is input to the thyristor forward conversion device 96 as a gate pulse, and a direct current (DC)
The rotation speed control of the motor 64 over a wide range is executed. The direct current (DC) motor 64 can cover a wide range, for example, from a high-speed rotation of 1750 rpm in a steady operation to a fine rotation of 7 to 10 rpm for moving the kicker 24 to the origin.

As shown in FIG. 1, on the outer peripheral surface of the disk 40 fixed to the other end of the rotating shaft 30, in addition to the detection piece 38 for detecting the origin, a detection target for detecting the speed switching timing is provided. Piece 99
Is fixed. Then, the detected piece 38 is
A second proximity sensor 89 for detecting the passage of another piece to be detected 99 is provided alongside the first proximity sensor 88 for detecting the passage of the object. That is, the second proximity sensor 89 detects the passage of the detection target piece 99 due to the rotation of the disk 40 and switches the rotation speed of the direct current (DC) motor 64 to a further lower side, as described later, One proximity sensor 88 detects passage of the detected piece 38 and operates to stop the rotation of the motor 64.

Next, actual return control of the kicker 24 based on such an example of the motor control circuit system will be described. First, a paper feeder 10, a flexographic printing press 12, a creasing slotter unit 14,
In the "Flexo Die Katas Lotter", which is a series of various paper processing units such as the die cut unit 16,
It is assumed that the supply of the corrugated cardboard sheet 22 in the previous order is completed, and that the corrugated cardboard sheets 22 having different standard dimensions are being prepared for the next order. At this time, direct current (DC)
The motor 64 has stopped after finishing the high-speed rotation of, for example, 1750 rpm during the steady operation.

Next, in order to return the kicker 24 to the origin, control at a very low speed rotation of the direct current (DC) motor 64 is performed. In the present embodiment, the slow rotation is effectively realized as a two-step control to shorten the set time. However, even a one-step control as described later can be used sufficiently. . That is, the direct current (DC) motor 64 is rotated at a speed sufficiently lower than the high speed rotation at the time of the previous steady operation by the thyristor leonard system according to the digital control method described with reference to FIG. The rotational speed of the motor 64 of the rotation at the start, if the first slow-speed speed RS ₁ shown in FIG. 2, the first slow-speed speed RS ₁ is finally kicker 24 at the time of the arrival at the origin position For example, 7-10r.
than the second slow-speed speed RS ₂ of the pm has a sufficiently large velocity.

Current (DC) to rotate the spur gear 32 is slowly by the rotation of the first slow-speed speed RS ₁ of the motor 64, the slider 34 is eccentrically rotated while being guided by the guide groove 36a, the required times to the pivot shaft 42 Giving a rocking motion in the moving direction. This swinging motion is converted into a horizontal linear motion by the crank arm 44 and the connecting rod 46, and the kicker 24 is directed to the origin corresponding to the size of the corrugated cardboard sheet 22 used in the order in the sending direction. To move. A detection piece 99 provided on the disk 40 that rotates integrally with the spur gear 32 is provided with a second piece
When passing through the detection surface of the proximity sensor 89, the sensor 89
A command signal is sent to the microcomputer 92 shown in the figure to change the rotation speed of the direct current (DC) motor 64, for example, the second speed of 7 to 10 rpm.
Further lowered to a very low speed the speed RS _2. Thus, the kicker 24 is further moved slowly toward the origin, and also rotate the disc 40 in the second fine speed speed RS ₂ mode.

Next, when the detection piece 38 provided on the disk 40 passes through the detection surface of the first proximity sensor 88 disposed at a fixed position, the sensor 88 sends a command signal to the microcomputer 92 and outputs a direct current (DC) motor. The rotation of the kicker 24 is stopped, thereby ending the return of the kicker 24 to the home position. In the present invention, as described above, a large-sized and large-output DC (DC) motor 64 functioning as a common drive source for a series of paper processing units is used as a drive source for moving the kicker 24 to the origin position.
Even if a paperwork unit with a high load is connected as described above, the kicker origin return operation can be performed without disconnecting the unit, greatly contributing to the improvement of work efficiency. Also, it is not necessary to separately provide an expensive dedicated mechanism for returning the kicker to the original point (a reduction gear having a high reduction ratio, a one-way clutch, etc.), thereby realizing a low production cost and a reduction in installation space. .

As described above, the reason that the two-stage speed control is performed on the direct current (DC) motor 64 is that the kicker 24 is first moved quickly to a position short of the origin position at a relatively high speed, and then moved near the origin position. This is because the speed is switched to a slower speed when it reaches the point, and the origin stop is surely achieved, thereby shortening the set time. Therefore, if the setting time is not required to be significantly reduced, the second proximity sensor may be used.
The arrangement of the first proximity sensor 88 and the detection piece 99 is omitted.
And the detection piece 88 may be simply arranged.

In the present invention, a case in which a normal large DC motor is used as a drive motor has been described. However, even with an AC motor, speed control can be freely performed from high-speed operation to extremely low-speed rotation by inverter control. Any type of AC / DC motor may be used as necessary.

Effects of the Invention As described above, according to the kicker home return control method of the paper feeder according to the present invention, an expensive one-way clutch for home return of a kicker and a reduction gear motor having a high reduction ratio required in the conventional apparatus are provided. The disposition can be omitted, and the space for disposing the disposition can be eliminated, so that the manufacturing cost can be significantly reduced. In addition, since a large output motor, which is a common drive source for the entire papermaking unit, is used as the drive source for returning the kicker to the home position,
Even during the home position return control, there is no need to disconnect a paperwork unit such as a die-cut unit having a high load from the series connection system, and a beneficial effect such as a significant improvement in work efficiency is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a paper feeder in which a kicker origin return control method of the paper feeder according to the present invention is suitably implemented, and FIG. 2 is a kicker origin return of the paper feeder according to the present invention. In the control method, a speed graph in the case of controlling the DC motor in two stages is shown. FIG. 3 is an example for controlling the speed of the DC motor used in the kicker origin return control method of the present invention. FIG. 4 is a schematic view of a thyristor leonard system according to the digital control system, FIG. 4 is a perspective view showing a schematic configuration of a sheet feeder having a kicker origin return mechanism including a speed reduction mechanism having a one-way clutch, and FIG. FIG. 3 is a schematic side view of a flexo die cutter slotter in which a plurality of flexographic printing presses, creaser slotter units, and various paper processing units such as die cut units are arranged in series on the downstream side of FIG. , A state where power is transmitted by a series of gear trains. 10 paper feeder, 12 printing unit 14 creamer slotter unit 16 die cut unit 20 paper feed table 22, 22 cardboard sheet 24 kicker 64 motor 88 first sensor , 89… Second sensor RS ₁ … First rotation speed RS ₂ … Second rotation speed

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-44454 (JP, A) JP-A-54-115872 (JP, A) JP-A-61-277521 (JP, A) 84036 (JP, U)

Claims (3)

(57) [Claims] 1. A sheet feeder having a reciprocally movable kicker (24) for feeding a plurality of cardboard sheets (22) stacked on a sheet feed table (20) one by one from a lowermost stage to a downstream side. The paper feed unit (10), and various paper processing units such as a printing unit (12), a creaser slotter unit (14), and a die cut unit (16) arranged in series downstream of the paper feeder (10); The power of a motor (64) as a common drive source built in the paper feeding device (10) is supplied to each of the paper processing units via a series of gear trains, and is the last retreat point of the kicker (24). When returning to the original point, in a paper processing apparatus in which the rotational speed of the motor (64) is switched to an extremely low rotational speed as compared with the normal operation and the kicker (24) is returned to the original point, Turn off the rotation speed in) For example, first sufficiently lower than the rotational speed in normal operation the first rotational speed (R
Is switched to S _1), the kicker (24) is moved to near the home position, that the kicker (24) is close to near the origin position is detected by the second sensor (89), said motor ( 64)
The first rotational speed (RS ₁ ) of the second lower rotational speed (RS ₂ )
The first sensor (88) detects that the kicker (24) has reached the home position, and the motor (64)
A kicker origin return control method for a sheet feeding device, characterized by controlling the rotation of the kicker to stop. 2. A motor according to claim 1, wherein a direct current (DC) motor is used as said motor, and said direct current (DC) motor is controlled, for example, by a thyristor leonard system according to a digital control system. Kicker origin return control method for paper feeder. 3. A kicker for a sheet feeding device according to claim 1, wherein an alternating current (AC) motor is used as said motor (64), and said alternating current (AD) motor is controlled by an inverter system, for example. Home position return control method.