JPH09136734A - Paper feeder for sheet of corrugated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly feed a sheet of corrugated board without being affected by the difference in the shape or the structure of the corrugated paper by open ing a gap through which only a sheet of corrugated board can be passed at the bottom of a restriction plate and by disposing a pair of up-and-down feeding rubber roller in the outside of the paper feeding direction of the restriction plate. SOLUTION: When an output shaft 17a is rotated by a servo motor, the rotation force thereof is transmitted to a toothed belt 14 via a large diameter roller 12 and a small diameter roller 13 and the paper at the bottom is passed through a gap 18a between the bottom surface of a restriction plate 18 and a base frame 11 by friction force between the toothed belt 14 and the corrugated paper 1. The sheet of corrugated board 1 is passed between feeding rubber rollers 19 and sent to the next process by rotating the rubber rollers 19 at a constant circumferential speed like an arrow F. The moving speed of the sheet of corrugated board 1 is assisted by the toothed belt 14 after the sheet of corrugated board 1 is pinched by a pair of up-and-down rubber rollers 19 to correctly feed the board 1 to the next processing position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard paper feeder used in a corrugated board box making machine and the like. The present invention relates to a sheet feeding device that supplies the papers with the same timing.

[0002]

2. Description of the Related Art In general, a corrugated cardboard box forming process includes a paper feeding process for supplying corrugated paper cut into a predetermined shape,
A printing process of performing necessary printing on a predetermined portion of the corrugated cardboard paper, a process of forming predetermined cut grooves and bent portions, a gluing process of connecting a body portion, and folding and gluing of paper after gluing. The main working steps are a step, a step of stacking a predetermined number of the obtained products, a step of feeding the stacked products to a binding machine, and a step of binding the fed products.

Generally, as a device for feeding a large number of stacked corrugated paper sheets one by one from the bottom to the next step, three technical means shown in FIG. 3 to FIG. 5 are roughly classified. In the example shown in FIG. 3, the paper feed direction A of the corrugated paper 1 is
The kicker plate 2 is arranged in a position opposite to the above position, and the kicker plate 2 is horizontally reciprocated by a driving source (not shown) to kick the rear end face of the corrugated paper 1 for feeding to the next step. . Usually, the corrugated cardboard paper 1 is set so that the end in the feeding direction abuts on the limiting plate in order to maintain the vertically aligned state, and the gap formed in the lower end surface of the limiting plate is a single corrugated cardboard sheet. Are supposed to pass through. Further, the processing section in the next step, for example, the printing section, the die cutting section, and the groove cutting section are fed by one sheet feeding 1
Since it is a turn, the rear end face of the corrugated paper 1 is set to be perpendicular to the kicker plate 2. Further, a method of moving the kicked corrugated cardboard sheet 1 by the rotational force of a pair of upper and lower feed rubber rolls is usually used.

In the example shown in FIG. 4, the corrugated paper sheets 1 are stacked on a large number of rubber rolls 3 and 3 arranged in parallel, and the rubber rolls 3 and 3 are intermittently rotated in the direction of arrow C, whereby 1 is fed in the paper feed direction A by the frictional force of the contact surface with the rubber rolls 3, 3. In order to increase the frictional force between the rubber rolls 3 and 3 and the corrugated paperboard 1, there is also known a method of sucking the lower surface of the corrugated paperboard 1 as shown by an arrow B by using a vacuum device (not shown) arranged below. There is.

The example shown in FIG. 5 is an apparatus in which a plurality of endless rubber belts 5 are mounted in parallel between a pair of rollers 4 and 4 and a large number of corrugated paper sheets 1 are stacked on the rubber belts 5. Shows. In this example, while rotating the rollers 4 and 4 in the direction of arrow D, the rubber belt 5 is moved to the direction of arrow E,
As shown in E, when the rubber belt 5 is moved up and down at a proper timing, the rubber belt 5 swings as shown by the phantom line, the frictional force of the contact surface with the corrugated paper 1 is increased, and the corrugated paper 1 is transferred one by one. It is transported to the process. Even in the case of this device, a method of sucking the lower surface of the corrugated paper 1 toward the rubber belt 5 side by using a vacuum device (not shown) is also used.

[0006]

However, in such a conventional corrugated board feeding device for a corrugated board box making machine, the rear end surface of the corrugated board 1 is kicked by the reciprocating movement of the kicker plate 2 shown in FIG. In this method, high smoothness is required between the front end of the corrugated cardboard paper 1 passing through the gap formed on the lower end surface of the limiting plate (not shown) and the rear end surface of the corrugated paper board 1 kicked by the kicker plate 2. However, if there is a "warp" in the corrugated cardboard paper 1, there is a problem that a miss kick is likely to occur.

Since the kicker plate 2 reciprocates to kick the corrugated cardboard paper 1, the speed at which the kicker plate 2 advances is highest when the tip of the corrugated paper sheet 1 enters between the pair of upper and lower feed rubber rolls. It is a speed, and it decelerates immediately after that. This is because the motion of the kicker plate is controlled by the crank motion. However, in many cases, the corrugated line in the axial direction is usually processed on the corrugated cardboard paper 1, and the thickness of the paper is compressed at that position, so that the sheet can be sufficiently held at the interval between the pair of upper and lower feed rubber rolls. Instead, the traveling speed is hindered by the frictional force applied to the latter half of the corrugated paper 1 and the paper feeding position becomes inaccurate.
Furthermore, there is a drawback that the rate of occupational accidents caused by the kicker plate 2 is high.

In the case of the apparatus shown in FIG. 4, since the friction area between the rubber rolls 3 and 3 and the corrugated cardboard paper 1 is small, the corrugated corrugated paper having the above-mentioned "sled" is located between the corrugated paperboard 1 and the rubber rolls 3 and 3. There is a problem that the machining position is likely to be displaced due to the contact deviation. Further FIG.
In the device shown in FIG. 3, an irregular deviation may occur when the running rubber belt 5 comes into contact with the lower surface of the corrugated cardboard paper 1, and a vacuum device is used to increase the frictional force between the rubber belt 5 and the corrugated paper 1. Even if sucked, the rubber belt 5 itself swings up and down, so that it is difficult to obtain a stable frictional force, which causes a deviation of the processing position.

[0009] Particularly, the most important problem in feeding the loaded corrugated cardboard sheets 1 one by one from the bottom is that the "sled" of the corrugated cardboard sheets 1 is appropriately processed and separated one by one. is there. But generally the bottom one
Even if the lower surface of the corrugated cardboard paper 1 is sucked using a vacuum device for a sheet, usually, the suction place is widely set with the target of the maximum effective area of the corrugated cardboard paper 1.
When the suction force required for sending out the corrugated paperboard 1 is not sufficient and the area of the corrugated paperboard 1 is small, useless air enters from the suction port that does not adsorb the corrugated paperboard 1 and the suction power is extremely high. It also has the problem that

Therefore, the present invention solves the problems of the above-described conventional corrugated paperboard sheet feeder for corrugated paperboard box making machines and eliminates the above-mentioned "warpage" of corrugated paperboard. To provide a corrugated paper sheet feeding device capable of performing accurate paper feeding without being affected by a positional disorder and a phenomenon that obstructs a traveling speed due to a frictional force and is not affected by a difference in shape or structure of the corrugated paper sheet. The purpose is.

[0011]

In order to achieve the above object, the present invention provides a wind tunnel type base having openings at upper and lower sides and rollers arranged in parallel on the inner upper side of the base. Endlessly attached to the tooth belt, a servo motor that intermittently rotatably drives the roller, a vacuum device that sucks a large number of corrugated cardboard sheets stacked on the base onto the tooth belt surface, and a supply of the corrugated cardboard sheet. A limiting plate which is located at an end portion in the paper direction and maintains a vertically aligned state of the corrugated cardboard paper, and a lower end portion of which is provided with a gap through which only one corrugated paper sheet can pass, The basic structure is a corrugated cardboard paper feeding device including a pair of upper and lower feed rubber rolls.

Then, a free wheel conveyor is arranged between the tooth belts, and a vacuum motor is used to increase the adhesion between a large number of corrugated paper sheets and the surface of the tooth belt, and the servo motor is driven to rotate the tooth belt. By the frictional force between the tooth belt and the corrugated paper, only the bottom corrugated paper is passed through the gap of the limiting plate and fed between the feed rubber rolls, and the corrugated paper is sent to the next process by the rotational drive of the feed rubber rolls. There is provided a configuration in which the movement of the tooth belt is stopped by stopping the servo motor immediately before the end passes through the gap of the restriction plate, and a configuration in which a rubber belt is attached to the surface of the tooth belt.

[0013]

According to such a corrugated paperboard feeding device, a large number of corrugated paperboards are stacked on the base to maintain the alignment state, and the vacuum device is activated before the servomotor is activated. The rotational force of the roller is transmitted from the roller to the tooth belt, and due to the frictional force between the tooth belt and the corrugated cardboard paper, only the bottommost sheet of paper passes through the gap opened between the lower end surface of the limiting plate and the base, and then the upper and lower pairs. And is fed to the next process. The traveling speed of the corrugated cardboard paper during this operation is almost the same as the peripheral speed of the feed rubber roll, and the moving speed after the corrugated paperboard is sandwiched by the rubber roll is also supported by the tooth belt, and the traveling speed of Can be sent accurately.

The servomotor is stopped immediately before the end of the corrugated paper passes through the gap of the limiting plate, and the corrugated paper is moved by the driving force of the feed rubber roll, and then the servomotor is restarted to move to the next stage. Corrugated paper is fed to the next process one by one.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a corrugated paper sheet feeder according to the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, and 11 in the drawing is a wind tunnel type base whose upper and lower sides are opened. A plurality of large-diameter rollers 12, 12 and a small-diameter roller 13, 13 are arranged in a pair in each part, and a plurality of endless tooth belts 14, 14 are arranged in parallel between each pair of rollers 12, 13. It is suspended. A rubber belt is previously attached to the surfaces of the tooth belts 14, 14. Reference numerals 15 and 15 are guide rollers disposed inside the tooth belts 14 and 14, and reference numeral 12a is an auxiliary roller. Numerals 16 and 16 are free wheel conveyors arranged between the tooth belts 14 and 14, and the corrugated paper sheet 1 is drawn by the suction force of the vacuum device.
This is to prevent damage to the suction surface of.

Reference numerals 1 and 1 denote a large number of corrugated cardboard sheets laminated on a base 11, and the plurality of tooth belts 14 and 14 and guide rollers 15 are provided on the lower surface of the corrugated cardboard sheet 1.
15 is in contact. An opening 1a formed below the base 11 is connected to a vacuum fan (not shown), and as shown by an arrow B, the lower surface of the corrugated cardboard paper 1 is sucked and the tooth belts 14, 14 and the corrugated cardboard paper 1 are sucked. It increases the friction force of.

Reference numeral 17 denotes a servo motor, and the output shaft 17a of the servo motor 17 has the large-diameter rollers 12, 1 described above.
It is fixed in a state of penetrating 2. Reference numeral 18 is a limiting plate for maintaining the upper and lower aligned states of the corrugated paper 1.
Between the lower end surface of the limiting plate 18 and the base 11, a gap 1 is set so that only one corrugated cardboard sheet 1 passes.
8a is opened. Numerals 19 and 19 are feed rubber rolls provided outside the limiting plate 18, 20 is a back stop mechanism for elastically abutting and supporting the end face of the corrugated paper 1 from the opposite direction to the limiting plate 18, 21 is a feeding rubber roll 19,
The sensor is provided at a position close to 19 and detects passage of the corrugated paper 1. The servo motor 17 may be either a DC type or an AC type.

The operation of the above embodiment will be described below.
Paper feeding is performed as follows. First, a large number of corrugated cardboard sheets 1 are stacked on the base 11 to maintain an alignment state between the limiting plate 18 and the backstop mechanism 20, and a vacuum fan (not shown) is operated to move the corrugated cardboard sheets 1 to the arrow mark. It is on standby in a state where it is sucked in the B direction and the adhesion with the tooth belts 14, 14 is enhanced. Then, by starting the servo motor 17, the output shaft 17a starts rotating. This rotational force is transmitted from the large-diameter rollers 12 and 12 and the small-diameter rollers 13 and 13 to the tooth belts 14 and 14, and due to the frictional force between the tooth belts 14 and 14 and the corrugated cardboard paper 1, only the bottommost sheet is restricted. Passes through a gap 18a opened between the lower end surface of the base and the base 11.

Further, the feed rubber rolls 19 and 19 are rotationally driven at a constant peripheral speed as indicated by arrows F and F, so that the corrugated paper 1 passes between the rubber rolls 19 and 19 and is fed to the next step. A pair of upper and lower feed rubber rolls 19,1
The spacing of 9 is slightly narrower than the thickness of corrugated cardboard paper 1 (5/10
0 ~ 0.1 mm) is set, this feed rubber roll 19,
The corrugated cardboard sheet 1 is held by 19 and conveyed.

Corrugated paper 1 is a pair of upper and lower rubber rolls 1.
The moving speed after being held by 9, 19 is 1 tooth belt.
It is also supported by Nos. 4 and 14, and even if there is a ruled line portion compressed in the axial direction, it can be accurately fed to the processing position of the next stage without causing slip.

The total running length of the corrugated paper 1 is registered in advance in the computer. The servomotor 17 is stopped immediately before the end of the corrugated paper 1 passes through the gap 18a of the limiting plate 18, and the tooth belts 14 and 14 are also moved. Stop. Therefore, the preceding corrugated cardboard paper 1 moves by the driving force of the feed rubber rolls 19 and 19 after passing through the gap 18a.

Then, the sensor 21 causes the corrugated paper 1
When it is sensed that the paper has passed, the servomotor is restarted in response to the command sent from the sensor 21, and the corrugated paper sheets 1 of the next stage are fed to the next process one by one in the same manner as described above. To be paper.

The traveling speed of the corrugated paperboard 1 during the above operation is almost the same as the peripheral speed of the feed rubber rolls 19, 19. In addition, the corrugated cardboard paper 1 laminated on the base 11
The frictional force of (B) is the frictional force at the contact surface between the bottommost sheet and the second sheet from the bottommost sheet, and (A) is the frictional force applied to the bottom surface of the bottommost sheet. And (B)
If the difference is, that is, (A) − (B) = G, the larger G, the more stable the cardboard paper 1 is sent out.

Now, the total weight of the corrugated paperboard 1 loaded is W
And the friction coefficient of the paper surface is P, the frictional force WP between the upper surface of the bottom paper and the lower surface of the second paper is WP =
B.

On the other hand, if the friction coefficient of the rubber belt attached to the surfaces of the tooth belts 14, 14 that are in close contact with and support the lower surface of the bottom sheet is T, the friction force is WT, but the suction force W of the vacuum fan is W. Since'is added to W, the frictional force of the rubber belt is (W + W ') T. In this case W '
Is a stable numerical value, the corrugated cardboard paper 1 almost completely closes the opening on the upper surface of the wind tunnel base 1, and the calculated suction force W'of the vacuum fan is added to W (W + W ') T = A is required.

As described above, the servo motor 17 is started after receiving the signal from the sensor 21, but the servo motor 17 has the total weight of the tooth belts 14 and 14 and the total weight of the rotating portion which holds the tooth belts 14 and transmits the rotational movement. And the above (W +
W ') A pair of upper and lower feed rubber rolls 1 that rotate while overcoming the total load of the frictional force A of T but rotate at the same time.
The corrugated cardboard paper 1 enters between the rubber rolls 19 and 19 at the moment when the peripheral speeds of 9 and 19 are synchronized. Further, the total running length L of the corrugated paper 1 is registered in advance in a computer (not shown), and the end of the corrugated paper 1 has a gap 18 in the limiting plate 18.
The tooth belts 14 and 14 are stopped immediately before passing through a, and the next-stage sheet is controlled so as not to follow and enter.

In the above embodiment, it is necessary to prevent the weight of the corrugated paper sheets 1 stacked on the base 11 and the suction force of the vacuum device from damaging the tooth belts 14 and 14 and the suction surfaces of the corrugated paper sheets 1. The weight of the stacked corrugated cardboard sheets 1 cannot be neglected. The backstop mechanism 20 has a function of supporting the end portion of the corrugated paperboard 1 and stacking only a substantially constant number of corrugated paperboards 1 to support most of the weight of the paper stacked on the upper surface.

[0028]

As described in detail above, according to the corrugated paperboard feeding apparatus of the present invention, only the bottommost paper sheet passes through the gap of the limiting plate due to the frictional force between the tooth belt and the corrugated paperboard, and then moves up and down. It passes between a pair of feed rubber rolls and is sent to the next process.The traveling speed of the corrugated paper at this time is almost the same as the peripheral speed of the feed rubber rolls, and the moving speed is also supported by the tooth belt to move to the next processing position. Can be sent accurately.

The servomotor is stopped immediately before the end of the corrugated board passes through the gap of the limiting plate and moved by the driving force of the feed rubber roll, and when the sensor detects that the corrugated board has passed, the servomotor turns on. It is possible to start up and feed the next corrugated paper.

Therefore, compared to the method of kicking the rear end surface of the corrugated paper by reciprocating the kicker plate, high smoothness between the front end surface and the rear end surface of the corrugated paper is not required, and the corrugated paper has a "warp". However, the paper can be fed without any problem. Further, there is no shift in the contact between the rubber roll and the corrugated paper due to the size of the friction area between them, and the processing position in the next stage does not shift irregularly.

Furthermore, there is no fear that the suction force for sending out the corrugated paper will be insufficient, or the malfunction will be caused by the intrusion of air from the suction port that does not adsorb the corrugated paper.
The paper feeding operation and the paper feeding position are normalized, and the phenomenon that the traveling speed is obstructed by the frictional force is eliminated, so that accurate paper feeding can be performed without being affected by the difference in the shape or structure of the corrugated paper.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a paper feeding device for corrugated paper according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a schematic perspective view showing an example of a conventional paper feeding device for corrugated paper.

FIG. 4 is a schematic perspective view showing another example of a conventional sheet feeding device.

FIG. 5 is a schematic perspective view showing another example of a conventional sheet feeding device.

[Explanation of symbols]

 1 ... Corrugated cardboard 11 ... (Wind tunnel type) base 12, 13 ... Roller 14 ... Tooth belt 15 ... Guide roller 17 ... Servo motor 17a ... Output shaft 18 ... Limiting plate 18a ... Gap 19 ... Feed rubber roll 20 ... Back stop mechanism 21 ... Sensor 22 ... Air cylinder 22a ... Piston rod 23 ... Rack gear 24 ... Guide roller 25 ... Rotating shaft 26 ... Brake rotor 27 ... Brake pad

Claims (4)

[Claims] 1. A device for feeding corrugated cardboard paper cut into a predetermined shape to a next step, wherein a predetermined cut groove and a bent portion are formed after printing a predetermined portion of the fed corrugated paper. The upper and lower sides are opened in the corrugated board paper feeder of the corrugated board box making machine whose main work steps are the gluing process, the folding and bonding process, the stacking process and the product binding process. A wind tunnel type base, a tooth belt endlessly hung between rollers arranged in parallel on the inner upper side of the base, a servo motor for intermittently rotating the rollers, and a base on the base. A vacuum device for sucking a large number of corrugated cardboard sheets stacked on the tooth belt surface to the tooth belt surface, and a bottom end portion for maintaining the vertically aligned state of the corrugated cardboard sheets at the end in the paper feed direction A corrugated board which is provided with a restriction plate having an opening through which only one corrugated paper sheet can pass and a pair of upper and lower feed rubber rolls arranged outside the restriction plate in the sheet feeding direction. Paper feeder. 2. The paper feeding device for corrugated paper according to claim 1, wherein a free wheel conveyor is arranged between the tooth belts. 3. A vacuum device drives the servomotor to rotate the tooth belt with the adhesion between a large number of corrugated paper sheets and the surface of the toothed belt being enhanced, whereby the frictional force between the tooth belt and the corrugated paper sheet causes the bottom portion of the tooth belt to rotate. Only the corrugated paper is passed through the gap of the limiting plate and fed between the rubber feed rolls, the corrugated paper is sent to the next process by the rotation of the feeding rubber roll, and the servo motor is fed just before the end of the corrugated paper passes through the gap of the limiting plate. The corrugated paper sheet feeder according to claim 1 or 2, wherein the movement of the tooth belt is stopped by stopping. 4. The paper feeding device for corrugated paper according to claim 1, wherein a rubber belt is attached to the surface of the tooth belt.