JPH0790932B2 - Paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding a cardboard sheet or other cardboard cut to a predetermined size to a processing device such as a printing device.

[Conventional technology]

As a conventional paper feeding device for feeding a corrugated board sheet to a printing device, there is a device generally called a kicker system. This kicker device is generally a kicker for kicking only the lowermost corrugated cardboard sheets to a table for stacking corrugated cardboard sheets and sending them horizontally on the table, and is provided on the lower surface of the table and rotatably connected to the kicker. The link includes a link, a swing lever rotatably connected to the link, and a rotary disc that swings the link through a crank pin.

When the cardboard sheet sent by the kicker device is sent through a gap between the guide plate at the front end of the paper feeding device and the table, which can pass only one corrugated cardboard sheet, the feed provided at the downstream front end of the next process. It is sandwiched between rolls and sent to the next printing process.

In the above-mentioned kicker type paper feeding device, when the corrugated cardboard sheet is warped or bent, only a part of the rear end portion of the lowermost corrugated cardboard sheet comes into contact with the kicker. When it is sent by the kicker against the weight of the sheet, the rear end of the sheet may be bent or torn, which may cause a feeding error at the kicker, or the bottom corrugated cardboard sheet,
When passing through the gap between the table and the guide plate, a catch may occur and continuous feeding may not be possible.

Therefore, as shown in FIG. 5, the guide plate at the front end of the sheet feeding device is
A suction unit 03 is provided below the table 02 near 01 to adjust the thick paper W such as a corrugated cardboard sheet so as to be flat, and a paper feed roll 04 is provided in the suction unit. Has already proposed a suction-feed type paper feeding device for feeding the thick paper W to the feed roll 05.

(A) is a schematic vertical sectional view of the entire structure, (b) is a state in which the thick paper W is fed by the paper feed roll 04 and is caught in the feed roll 05, (c) is approximately half the thick paper W fed, A state in which the arcuate portion of the paper feed roll 04 rotates downward and is lowered, and the paper feeding operation by the paper feed roll 04 is stopped,
(D) shows a state in which the thick paper W is almost fed and the arcuate portion of the paper feed roll 04 is rising due to the next feeding operation.

[Problems to be Solved by the Invention]

However, as described above, in the kicker type only paper feeding device, when the corrugated cardboard sheet is curved or bent, only a part of the rear end portion of the corrugated cardboard sheet of the lowermost layer comes into contact with the kicker. When the corrugated cardboard sheet is sent by the kicker against the weight of the upper corrugated cardboard sheet, its rear end may bend,
If it is torn, it causes a feed error in the kicker, or when sending the bottom corrugated cardboard sheet from the gap between the front guide plate and the table, the front end part gets caught in the guide plate and cannot be sent out. Problems may occur.

On the other hand, in the paper feeding device of the suction device and the paper feeding roll provided inside, the cardboard thick paper and the paper feeding roll that feeds it out easily slips, making the feeding amount uncertain and The timing of feeding paper to the process is likely to be incorrect.

Further, in the paper feed roll method, since the synchronization of each operation timing such as acceleration, synchronization, deceleration, and stop of the paper feed roll with respect to the feed roll is performed by a mechanical mechanism,
It has a drawback that the structure is complicated and an error is likely to occur.

The present invention has been made in view of the current state of the art of the above-described conventional paper feeding device, and an object of the present invention is to provide a paper feeding device that accurately feeds a cardboard cardboard without bending or damaging it. .

[Means for Solving the Problems]

Therefore, in the present invention, as a means for solving the above problems, a kicker for intermittently advancing and retracting the lowermost layer of cardboard sheets such as corrugated cardboard sheets stacked on a feeding table one by one, and a cardboard for the lowermost layer A suction unit that sucks at least a portion downward, and a paper feed roll that rotates in contact with the thick paper at the time of feeding the thick paper are synchronized with the thick paper feeding speed of the kicker that accelerates to the rotation speed of the roll in the next process, and The sheet feeding device is configured by providing a drive control unit that controls the feeding speed of the sheet feeding roll so that the synchronized state is maintained until the trailing end of the thick paper fed out passes through the sheet feeding roll.

[Action]

In the paper feeding apparatus according to the present invention configured as described above, the thick paper stacked on the paper feeding table is first fed by accelerating the kicker and the paper feeding roll at a synchronized speed. After the lapse of a predetermined time, when the feeding speed of the thick paper is synchronized with the rotation speed of the roll in the next process, the thick paper is caught in this roll.

Here, the roll of the next step is, for example, a feed roll provided at the inlet when the next step is a printing device or a printing roll when this feed roll is not provided, that is, a roll including a plate cylinder and an impression cylinder. means. Below, it is called the next process roll.

When the thick paper bites into the next process roll, it is fed at the feed speed of the next process roll, and then the paper feed roll remains in synchronization with the next process roll, but the kicker decelerates away from the rear end of the thick paper, Eventually, it will stop, move backward and return to the initial setting position for the next feed operation. During this time, the thick paper is continuously fed in synchronization with the feeding speed of the next process roll, and when the trailing edge of the thick paper separates from the paper feed roll, the paper feed roll is stopped.

During the above-described cardboard feeding operation, the cardboard is always sucked downward by the suction unit to prevent the cardboard warping, bending, etc. from interfering with the cardboard feeding operation.

When one piece of thick paper is fed as described above, the next lowermost thick paper is sucked again by the suction unit and fed by the kicker and the paper feed roll in a flat state, and the same cycle is repeated.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a sheet feeding device according to the present invention is provided on a sheet feeding table 1 on which cardboard sheets W and other cardboards W are stacked and placed, and slides horizontally so that the lowermost layers of the cardboard are separated one by one. A kicker 2 for intermittently advancing and retreating and sending out, and a suction unit 3 for sucking down the front end portion of the lowermost thick paper W.
And a paper feed roll 4 which is provided in the suction unit 3 and rotates in contact with the thick paper W when the thick paper W is fed out. A feed roll 5 is provided in the front part of the next process for feeding the thick paper W fed by the kicker 2 to the next process.

Since the thick paper W is fed to the front end of the paper feed table 1 one by one, a gap 6 for one thick paper is formed between the paper feed table 1 and the front end.
A vertical guide plate 7 is provided so as to form

The suction unit 3 sucks the thick paper W downward through a suction tube 8 connected to a suction blower (not shown).
The upper part of the suction unit 3 is largely open, and the paper feed rolls 4 are arranged in a zigzag pattern inside the suction unit 3.

The paper feed roll 4 is rotationally driven with respect to a circular roll shown in the drawings via a brake, a clutch, and a motor (AC servomotor) described later.

The kicker 2 includes a rapid feed mechanism 9 and a rotary shaft 10 as shown in the figure.
Levers 11 and 11 'which are integrally formed in a V shape via
It is connected to a link 12 and a link receiver 13 which are connected to this, whereby the kicker 2 reciprocates horizontally with respect to the paper feed table 1.

The rapid feed mechanism 9 includes a rotating plate 9b rotated by a rotating shaft 9a.
And a crank pin 9c provided therein and a guide groove 11a provided in the lever 11 into which the crank pin 9c is fitted.

In addition, the rotary shafts 9a and 10 and the rotary shafts 5a and 5a of the feed rolls 5 and 5 provided in the next step, and the feed rolls 5 and 5,
5, a rotary shaft or the like for rotating a plate cylinder or the like (not shown) of the printing apparatus P provided behind the printer P is mechanically connected to the rotary shaft and the like. Etc. are all performed by a mechanical coupling mechanism.

The operation of this embodiment configured as described above will be described.

FIG. 2 illustrates the action of the fast-forward mechanism 9 that horizontally reciprocates the kicker 2. As is well known, rotating plate
When 9b is rotated, lever 11 is actuated by the action of crank pin 9c.
Oscillates between the illustrated angles θ. In this case, the crank pin 9c rotates by the angle β with respect to the forward movement of the kicker 2 and by the angle α with respect to the backward movement, and the rotation angles α and β are α> β. Then, the horizontal movement speed of the kicker 2 in the forward direction becomes maximum near the position (bottom dead center) of the angle θ / 2 (or β / 2).

The horizontal movement speed of the kicker 2 by the lever 11 is the third
It changes as shown in FIG.

t ₀ is the rotation start point of the paper feed roll, and the sensor A detects this point. When the rotating plate 9b rotates in the direction of the arrow in FIG. 2, the rotation accelerates the kicker 2 along the curve shown in the figure, and at time t ₁ , the leading end of the thick paper W is fed by the feed roll 5,
Bitten by 5. After that, the thick paper W is sent to the printing device P which is the next processing unit by the feed rolls 5 and 5.

The speed of the kicker 2 in the forward direction is gradually decelerated after passing the time t ₁ , so that the rear end of the thick paper W separates from the kicker 2. When the crank pin 9c rotates by the angle β from the rotation start point (time t ₂ ), the kicker 2 switches from forward to reverse, and the speed of the kicker 2 temporarily becomes zero. After that, the kicker 2 starts to move backward, and the crankpin
When 9c rotates to the angle α / 2 and reaches the top dead center (time
The reverse speed is accelerated until t ₃ ) and after time t ₃ and time t ₄
Until then, the speed is decelerated and returns to the original phase angle at time t ₄ which is the switching point from backward to forward of kicker 2,
After this, exactly the same cycle as the speed fluctuation in one cycle is repeated.

It should be noted that the speed curve in one cycle described above takes time t _{0 to} t ₁
The time integration between the two corresponds to the length l ₁ in FIG.

Now, with respect to the feeding speed of the paperboard by kicker 2 described above, the feeding speed of the sheet feed roller 4 and the feed rate, between the time t ₀ ~t ₁ as shown in FIG. 3 (b) completely tuned The speed must be If the feed speed of the paper feed roll 4 is too fast, an accurate feed speed by the kicker 2 cannot be obtained,
On the contrary, if it is too late, the cardboard may be bent by the force pressed by the kicker 2.

When the thick paper W is caught in the feed rolls 5 and 5 at time t ₁ , thereafter, the motor of the paper feed roll 4 is rotated so that the feed speed of the paper feed roll 4 is synchronized with the feed speed of the feed rolls 5 and 5. . The tuning time t ₁ ~t ₁ 'has at least a rear end of the cardboard becomes to away from the paper feed roll 4 of the forwardmost end, the movement distance l ₁ from the time t ₁ in this period of time t _1' moving distance in (L -l _2: thick paper to a considerable) to that time integration between FIG. 3 (b) the sheet feeding for the time t ₀ ~t rate curve ₁ of rolls' moves.

Time for the trailing edge of the thick paper W to pass through the frontmost paper feed roll 4
t ₁ ′ is detected by an electric control circuit which will be described later, and at the moment when time t ₁ ′ is detected, the one clutch is turned off and the brake is turned on to suddenly stop the paper feed roll 4 and at least until time t _4. To stop the motor.

When the crank pin 9c of the rotating plate 9b is time t ₄ reaches (t _0),
The one clutch is turned on again by the signal of the sensor A, the brake is released, and the above one cycle is repeated.

In the above embodiment, the paper feed operation by the paper feed roll 4 is stopped by using the one-way clutch and brake, but as an alternative method, the one-way clutch and brake are not used, and at time t ₁ ′. It will be clear that any method of lowering the feed roll 4 can be used. In this case, the paper feed roll 4 is raised at time t ₄ (t ₀ ).

The operation of the above embodiment is controlled by the electric control circuit 20 shown in FIG. This control circuit 20 sends a signal from the timing signal generating circuit 25 by this signal when the signal of the sensor A that detects the starting point (time t ₀ point) of one cycle of the crank pin 9c of the fast-forwarding mechanism 9 is detected. The brake 31 is turned off and the clutch 32 is turned on so that the motor 33 (AC servomotor) can be rotationally driven.

At the same time, the signal of sensor A is also sent to the function generator 21. Then, the function generator 21 are interlocked mechanically rotational shaft 9a and the rotating plate 9b, the pulse generator PG _a for detecting the rotational speed of the rotating shaft 5a of the feed rolls 5 which is part of the next step
Speed signal [Phi _a of is always given as a constant rotational speed. The function generator 21 generates the same speed voltage signal V _a as the forward rising speed curve, which is a mechanically unique speed curve of the kicker 2 determined by the input speed signal Φ _a , and supplies this to the motor drive circuit 24. Drive the motor 33.

Speed voltage signal V _a at time t ₁ in the speed curve of the speed voltage signal V _a of the function generator 21 is generated is maximum, at this time (time t _1), is driven to rotate based on the speed voltage signal V _a The rotation speed of the paper feed roll 4 corresponding to the speed signal Φ _a matches the rotation speed of the feed roll 5 that rotates. After that, the function generator 21 outputs a speed voltage corresponding to the speed signal Φ _a of the feed roll 5, whereby the motor of the paper feed roll 4 is driven.
33 is rotationally driven in synchronization with the rotational speed of the feed roll 5.

When the paper feed by the kicker 2 and the paper feed roll 4 is started, the paper feed distance by the rotation speed of the motor 33 is measured by the pulse generator 34, and the output signal Φ _b is sent to the distance comparison unit 22.

In the comparison unit 22, the length L of the thick paper W shown in FIG. 1 is preset by the setting unit 23, and the paper feed roll 4 is set from this value L.
The feed amount [Phi _b cardboard W subtracted by (L-Φ _b) and l ₂
Is compared with. When (L-Φ _b ) is larger than l ₂ , the rear end of the thick paper W has not passed through the frontmost paper feed roll 4, so that the thick paper W by the paper feed roll 4 in synchronization with the feed roll 5 is The sending can be continued. (L-Φ _b ) is l ₂
At a time t ₁ ′ corresponding to, the trailing edge of the thick paper W passes through the frontmost paper feed roll 4.

At this time t ₁ ′, the signal from the distance comparison unit 22 is sent to the timing signal generation circuit 25, and the signal from this circuit turns on the brake 31 and turns off the clutch 32 to turn the paper feed roll 4
Stop quickly. Further, the signal from the distance comparison unit 22 is also sent to the function generator 21, and the output voltage signal V _{a is set} to zero on the basis of this signal to rapidly decelerate the motor 33 and stop it until at least time t ₄ . The thick paper W is fed at a constant speed by the feed rolls 5 and 5 even after the time t ₁ ′.

The rotary plate 9b of the fast-forward mechanism 9 makes one rotation and its crank pin
When 9c is detected again by sensor A, the moment is t
₄ (t ₀ ), and the detection signal is sent to the timing signal generation circuit 25 to release the brake 31 and the clutch 32.
The control cycle described above is repeated after turning it on.

Note that the thick paper W may be directly fed to the plate cylinder and the impression cylinder of the printing apparatus P in the next step without providing the feed rolls 5 and 5.

In this case, the signal Φ _a may be output from the shaft of the plate cylinder.

〔effect〕

As described in detail above, according to the present invention, a kicker as a paper feeding device, a paper feeding roll whose rising speed is synchronized with the kicker, and a unit for sucking thick paper downward are provided, and the kicker is used until the thick paper is caught by the next process roll. And the paper feed roll are perfectly synchronized to feed thick paper with both, and after being bitten by the next process roll, the paper feed roll is synchronized with the speed of the next process roll to feed thick paper. The thick paper can be continuously and reliably processed in the next process without sagging the thick paper when it is installed, stopping the paper feed due to bending, or causing the paper feed timing error that occurs when only the suction unit and the paper feed roll are installed. It has the advantage that it can be sent to

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a sheet feeding device according to the present invention, and FIG.
FIG. 3 is an explanatory view of the operation of the fast-forward mechanism, FIG. 3 is an explanatory view of speed fluctuations of a kicker and a paper feed roll, FIG. 4 is a block diagram of an electric control circuit of the paper feed device, and FIG. 5 is a paper feed roll and suction. It is a schematic diagram of a sheet feeding device of a conventional example provided with a unit. 1 ... Paper feed table, 2 ... Kicker, 3 ... Suction unit, 4 ... Paper feed roll, 5 ... Feed roll, 6 ... Gap, 9 ... Fast-forward mechanism, 9b ... Rotating plate, 9c ... … Crank pin, 9a, 10 …… Rotary shaft, 11,11 ′ …… Lever, 12 …… Link, 13 …… Link receiver.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Togawa 4-1-1186 Daikai, Fukushima-ku, Osaka City, Osaka Prefecture Rengo Co., Ltd. Central Research Laboratory (56) Reference JP-A-54-115872 (JP, A) ) Actual development Sho 48-51775 (JP, U)

Claims (1)

[Claims] 1. A kicker which is driven synchronously with a roll in the next step and intermittently moves back and forth one by one to feed the lowermost layers of cardboard sheets such as corrugated cardboard sheets stacked on a paper feeding table, and the lowermost cardboard. A suction unit that sucks at least a portion downward, and a paper feed roll that rotates in contact with the thick paper when the thick paper is fed out are synchronized with the thick paper feed speed of the kicker that accelerates to the rotation speed of the roll in the next process, and A sheet feeding device comprising a drive control unit for controlling a feed speed of a sheet feeding roll so that the synchronized state is maintained until a trailing end portion of the thick paper fed out passes through the sheet feeding roll.