JPH10180906A - Manufacture and device for spiral paper tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the response speed and manufacture paper tubes at high speed by starting the movement of a cutting device when a paper tube is formed into a length computed based on the distance in the period of time in which the cutting device is changed over from the stopping state to the speed equal to the forming speed of the paper tube, and cutting the paper tube. SOLUTION: When paper tubes 7 are manufactured continuously at the constant forming speed v0, a cutting device is stopped in the standby state. When the distance P from the stopping position of the cutting device 5 and the end of a paper tube 7 reaches the set value Ps, the work of the cutting device 5 is started. At the time when the moving speed (v) of the cutting device 5 is equal to the paper tube forming speed v0, cutting is carried out by the cutting device 5 while moving in parallel with the paper tube 7 and the cutting device is retracted to the original stopping position quickly. The length of formation P of the paper tube is computed directly or based on the feed amount of a paper tape, and the length Ps of the formation of the paper tube at the time of starting the movement of the cutting device 5 is set preliminarily. The response speed of control for cutting is fixed, and the manufacture of the cutting paper tubes can be carried out at high speed accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a paper tube which can cut a formed paper tube into a set length while continuing to manufacture a spiral paper tube. TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a paper tube capable of cutting efficiently and cutting efficiently.

[0002]

2. Description of the Related Art A spiral paper tube is cut into a set length by a plurality of cutting blades arranged at intervals corresponding to the set length, and the leading end of the paper tube is cut off.
In this case, there is a waste in cutting off the leading end of the paper tube every time the cutting is performed. Therefore, as shown in FIG. 11, paper tapes (71), (72) and (73) are supplied obliquely to a mandrel (2) having one end supported on a base (1) and spirally formed by belts (23) and (24). The paper tube is formed by winding the paper tube, and the paper tube is sent out so as to fit on the core shaft (43) on the downstream side, and the slide table (40) equipped with the cutting device (5) is moved to the slide driving device (4). An apparatus (Japanese Patent Publication No. 8-11430) has been proposed which cuts the paper tube by the cutting device (5) while moving the paper tube along the axis of the paper tube in accordance with the feed speed of the paper tube.

In the cutting device (5), if the diameter of the mandrel (2) and the width of the paper tape are determined, the paper tapes adjacent in the axial direction of the mandrel (2) do not overlap, and the paper tape is wound without being separated. When the angle α of the paper tape with respect to the mandrel (2) is determined, and the feed amount L of the paper tape is measured, the formation length P of the paper tube when the paper tape is spirally wound around the mandrel (2) is as follows. The timing of cutting is controlled by utilizing the result obtained by the equation (FIG. 10).
See). P = L sinα

As shown in FIG. 12, a feed roller (390) for supplying a paper tape is provided with a rotary encoder (240).
The feed amount L of the paper tape is detected. The width of the paper tape (71), the diameter of the mandrel (2), and the number of rotations of the drive motor (30) of the belts (23) and (24) are set on the control panel (400) of the paper core manufacturing apparatus, and the paper core is manufactured. Start the equipment. The microcomputer (330) of the control device rotates the drive motor (30), rotates the belts (23) and (24) around the mandrel and the pulley, winds the paper tape in a spiral around the mandrel (2), and winds the paper tube. Form. At the same time, the slide drive (4) is operated to bring the slide base (40) closer to the mandrel (2),
When a detection signal is input from the origin sensor (350), it stops at that position and stands by.

Next, the control operation for cutting the paper tube will be described with reference to FIG. The tip of the formed paper tube is, for example, a cutting blade (51) of a cutting device (5) attached to a slide table (40) (FIG. 1).
1)), the control panel (4
When a reset signal is input from the control device (300) to the control device (300), the microcomputer (330) of the control device (300)
(5) Current position counter (310) and paper tube feed amount counter
(320) is reset (S10). Next, the microcomputer (330) sequentially reads the count value of the feed amount counter (320), and, based on the read value, a cutting device (5).
The paper core length P from the stop position to the tip of the paper core is calculated.
Then, the cutting device (5) is made to wait until the calculated paper core length P reaches a preset cutting length (S11).

When the paper tube length P reaches the preset cutting length, the microcomputer 330 activates the slide driving device 4 to move the cutting device 5 from the stop position (S12). At this time, since the paper tube length P is equal to the cutting length, the position where the paper tube should be cut is at the stop position of the cutting device (5). At the same time, the microcomputer (330)
The feed amount counter (320) is once reset and a new count is started (S12). The paper tube length P calculated by reading the new count value is the length of the paper tube formed after the cutting device (5) starts to advance. Therefore, the paper tube length P indicates the distance from the stop position of the cutting device (5) to the position where the paper tube should be cut.

Next, the microcomputer (330) reads the moving amount of the cutting device (5) from the count value of the current position counter (310), and calculates the cutting device based on the value.
The position of (5) is compared with the position of the paper tube to be cut determined by the feed amount counter (320) (S13). Then, the servo amplifier (340) is driven with the difference between the two (S14). By repeating this comparison and the driving of the servo amplifier (340), the cutting device (5) is moved following the paper tube until the positions match. Cutting device (5)
When the position of the paper tube coincides with the position to be cut, the microcomputer (330) drives the servo amplifier (340) to
The moving speed of the cutting device (5) is matched with the forming speed of the paper tube and held.

The microcomputer (330) operates the cutting device (5) while keeping the speed of forming the paper tube and the cutting device (5) at the same speed, and cuts the paper tube (S1).
Five). Therefore, the paper tube is cut to the set cutting length,
It is cut perpendicular to the central axis of the paper tube. After cutting the paper tube, the microcomputer (330) moves the slide table (40) upstream until a detection signal is input from the origin sensor (350). When the cutting device (5) is returned to the stop position, the microcomputer (330) stops moving the slide table (40) and resets the current position counter (310) (S1).
6). To continue the production of the paper core (S17), step S1
By returning to 1 and repeating the above steps, a paper tube of the set length can be formed continuously.

[0009]

That is, according to the control method of the paper tube manufacturing apparatus, when the paper tube is formed to a set length, the cutting device (5) starts moving in the paper tube feeding direction, Cutting equipment
(5) is made to follow the paper tube. Then, when the position of the paper tube to be cut matches the position of the cutting device (5), and the feed speed of the paper tube and the moving speed of the cutting device (5) match, the paper tube is cut. Control it. Therefore, the cutting device (5)
The moving position along the axial direction of the paper tube must always be compared with the cutting position of the paper tube. The response speed of the control for cutting is slow, and the paper tube is manufactured at a forming speed of 20 m / min or more. I couldn't do it. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for manufacturing a cut paper tube at a high speed and without cutting pieces by a new control method for cutting.

[0010]

An outline of a paper tube cutting method according to the present invention will be described with reference to FIG. The paper tube (7) has a constant forming speed v
When formed continuously at 0, the cutting device (5) is stopped and waiting. Stop position of cutting device (5) and paper tube (7)
When the distance P to the tip of the cutting device reaches a set value Ps described later, the cutting device (5) starts to advance (FIG. 7A). Cutting equipment
At the time Tc (FIG. 7B) when the traveling speed v of (5) is equal to and maintains the paper tube forming speed v0, the cutting device (5) translates with the paper tube (7). Cut (Fig. C)
It rapidly retreats to the original stop position (Fig. D). As a result, a paper tube (74) having the set paper tube length L0 is formed. Forming length P of paper tube
Is directly measured by the sensor means or calculated from the supply amount of the paper tape, and the paper tube forming length Ps when the cutting device (5) should start moving is set in advance by Ps = L0 + Dc−v0 × Tc. Is done. Here, Dc is the moving distance from the start of the movement of the cutting device 5 to the time Tc.

The method of manufacturing the spiral paper tube of the present invention comprises the steps of: a. Stopping the cutting device at a predetermined stop position and waiting; b. The paper tube has a constant forming speed of the paper tube, a period from when the cutting device starts moving from the stopped state until the cutting speed becomes equal to the forming speed of the paper tube, and a length calculated based on a distance traveled during the period. Initiating the advance of the cutting device when is formed, c. The cutting device cutting the paper tube after the traveling speed of the cutting device becomes equal to the forming speed of the paper tube; and d. The step of returning the cutting device to the original stop position is sequentially performed.

[0012]

According to the present invention, the speed pattern from when the cutting device starts moving from the stop state to when the speed becomes equal to the constant forming speed v0 of the paper tube is reproducible by the servo mechanism. , And the distance Dc to go to the period Tc can be predicted. Therefore, when the length of the cutting device from the leading end of the paper tube to the position Dc where the cutting device advances in the period Tc becomes the set forming length, that is, the cutting length L0, the cutting device reaches the position. The length of the paper tube formed at the time when the advance of the cutting device should be started is calculated. If the advance of the cutting device is started in a set pattern at the time when the paper tube is formed at the calculated paper tube length, when the cutting device reaches the position Dc, the length from the leading end of the paper tube to this position is reduced. The cutting length becomes L0, and at the same time, the cutting device moves at a speed v0 equal to the forming speed of the paper tube. Therefore, the cutting device can cut the paper tube to a predetermined cutting length only after the cutting device reaches the position.

[0013]

According to the present invention, a comparison step for checking whether or not the position of the paper tube to be cut and the position of the cutting device coincide with each other is unnecessary, so that the response speed of the control for cutting is high. Therefore, the production of the cut paper tube can be performed at high speed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a paper tube manufacturing apparatus.
0), the downstream side is a paper tube cutting section (101). FIG.
FIG. 2 shows a front view of a paper core manufacturing unit (100). Paper core manufacturing department (10
A hollow cylindrical mandrel (2) is horizontally fixed to a head (11) provided at the upstream end of (0) toward the downstream side. A slide shaft (21) is provided slidably and rotatably through the head (11), through the axis of the mandrel (2). head
(11) is slidably penetrated, and a connecting rod (25) is provided below the mandrel (2) in parallel with the mandrel (2).
The respective upstream ends of the slide shaft (21) and the slide shaft (21) are connected by a connecting member (10), and both slide integrally. The slide shaft (21)
It is rotatably supported by the connector (10). The connecting rod (25) is driven to rotate by a motor (22) provided on a side surface of the head (11).

On the base (1), a total of three cylindrical bases are provided at substantially the center of the length of the mandrel (2), one on one side of the mandrel (2) and two on the other side. The tubes (3), (31) and (32) are arranged vertically. The base cylinder (3) is in a fixed position, and a pair of opening / closing tables (34) and (35) are provided rotatably in a horizontal plane around the base cylinder (3). The other base cylinders (31) and (32) are provided on the free end side of (). Rotary drive motors (12), (13), (14) are independently connected to the respective base cylinders (3), (31), (32), and are forcibly rotated. The screw shafts (36) and (37) are threaded through the free ends of the opening / closing tables (34) and (35), and the screw shafts (36) and (37) are connected to the servomotor (38) for adjusting the winding angle. ).

The first and second belts (23) and (24) straddle between the base cylinders (3) and (31) and between the base cylinders (3) and (32), and are wound around the mandrel (2) once. It is stretched endlessly. Between the first belt (23) on the upstream side and the head (11), a paper tape (71) forming the innermost layer of a paper tube called the first paper from one side with the mandrel (2) interposed therebetween, and a paper tape (71) from the other side. In a state in which two paper tapes (72) and (73) called a third sheet and a third sheet are shifted and overlap each other, they are supplied to the mandrel (2) obliquely toward the downstream side. The width of each paper tape (71) (72) (73) is the same.

The paper tape (71) called the first paper is coated with wax on the inner surface thereof by a brazing device (6) shown in FIG. 5 in order to improve the slip with the mandrel (2). Brazing equipment
(6) Paper tape (71) pulled out from the tape drum (70)
Is guided by a row of rollers (61) to a container (62) containing wax. Of the roller row (61), a rotary encoder is attached to the roller (64) that rotates in accordance with the travel of the paper tape (71).
(63) is provided to detect the supply amount of the paper tape (71). 2
No. 3 and No. 3 paper tapes (72) and (73) are glued (not shown)
Thereby, glue is applied to the back surface.

The paper tapes (71), (72) and (73) are belts (23) and (24)
The paper tube is continuously formed by being wound, and is sent to the downstream side of the mandrel (2) by the winding force.
It is delivered to a core axis (43) described later. Depending on the winding angle of the belts (23) and (24) relative to the mandrel (2), the paper tape (7
The winding angle of 1) is determined, but the paper tape (71) is a mandrel (2)
On the other hand, by spirally winding the adjacent edges so that the edges do not overlap and the edges do not separate from each other, the supply amount of the paper tape is proportional to the length of the paper tube formed. Therefore, the diameter of the mandrel (2) and the paper tape (71) are added to the control panel (80) described later.
When the width of the servo motor (3
8) actuates, rotates the screw shafts (36) and (37), and opens and closes (34)
Adjust the opening angle of (35) so that the belts (23) and (24)
Belt so that (71) is correctly wound around the mandrel (2)
(23) The angle of (24) is automatically adjusted.

FIG. 10 is a view in which the formed paper tube is cut open along the axis. As shown in the drawing, when the paper tape (71) is wound so as to abut the adjacent edges, the side BC becomes the width W of the paper tape (71). Here, the supply amount L of the paper tape (71)
Is represented by a vector AD, the formation length P of the paper tube is represented by a vector ED. The triangle ABC and the triangle ADE are similar, and the side AB is the circumference 2πa of the paper tube (a is the radius of the paper tube).
Is represented by the following equation. P = WL / (2πa) Therefore, if the width W of the paper tape (71) and the radius a of the paper tube are constant, the formation length P of the paper tube is proportional to the supply amount L of the paper tape (71). The proportional constant is W / (2πa). Actually, since the edges adjacent to the paper tape (71) are slightly separated or overlapped, the formation length P of the paper tube is slightly different from the value calculated by the above equation and the measured value (about ± 5 mm per 1 m). Occurs). Therefore, the above equation is corrected based on the error.

FIG. 3 shows the paper tube cutting section (101).
On the base (1), a slide table (40) is provided so as to be slidable in the paper tube feeding direction, and a slide drive device is provided on the slide table (40).
(4) is linked. The slide drive device (4) is a base (1)
The screw shaft (46) is attached to the servo motor (45) that can
And an internal screw member protruding from the lower surface of the slide base (40)
(47) is screwed to the screw shaft (46), and the slide table (40) is reciprocally driven by screw thrust. In the present invention, the slide table (40) driven by the slide drive device (4)
When driving in the traveling direction of the paper tube to cut the paper tube, it is necessary to maintain a predetermined speed in a short time

The slide table (40) is provided with a cutting axis (43) and a cutting device (5). The core axis (43) has the same diameter as or slightly smaller than the diameter of the mandrel (2), and is provided on a pair of long receiving rollers (41) and (41) on the extension of the mandrel (2). ing. The long receiving rollers (41) and (41) are rotatably supported by the short receiving rollers (42) and (42), respectively. Core axis (4
3) is disposed on an extension of the slide shaft (21) penetrating the mandrel (2), and is connected to the slide shaft (21) so as to be detachable and integrally rotatable with the slide shaft (21). The slide base (40) is connected to the connecting rod (25) below the mandrel (2), so that the slide base (40) and the core shaft (43) reciprocate integrally.

As shown in FIG. 4, the cutting device (5)
Guide bar (44) arranged on the slide base (40) parallel to (43)
A support (53) is slidably and positionably disposed on the support, and a cylinder (52) is provided on the support, and the cylinder is rotatably supported by the cylinder at a position directly above the core axis (43). Raise and lower the blade (51). A motor (22) for rotating and driving the core shaft (43) via the slide shaft (21), a servo motor (45) for the slide drive device (4), a winding angle adjusting servo motor (38), a belt circling drive The motors (12) (13) (14) of the base cylinders (3) (31) (32) are connected to a control device (8). The base (1) is provided with a limit switch (15) for detecting that the slide base (40) has reached the stop position. The limit switch (15)
Is connected to a control device (8) comprising a control panel (80).

As shown in FIG. 6, the control device (8) includes a microcomputer (81) for executing various controls.
The microcomputer (81) includes a processing device (not shown) for executing various processes, and a memory for storing various data.
(82). The microcomputer (81) receives a detection signal from the limit switch (15) for detecting that the slide base (40) has reached the stop position. Also, the control device
(8) is an encoder (6) provided in the brazing device (6).
The supply signal counter (8) counts the pulse signal from (3) and sends the count value to the microcomputer (81).
3) is provided. The count value of the supply amount counter (83) is reset by receiving a reset signal from the microcomputer (81).

The control device (8) includes a control panel (80) for displaying and inputting data. Control Panel (8
In (0), a display is provided as data display means, and various switches are provided as data input means. Further, a transparent touch panel is provided on the display as data input means. Control Panel (80)
Receives data from the microcomputer (81) and displays characters or graphics on a display based on the data. Further, the control panel (80) transmits data based on inputs from various switches or a touch panel to the microcomputer (81). In this control panel (80), the operation of various rotary drive motors (12) (13) (14) (22),
Speed adjustment and stop, start and stop of paper core manufacture, start and stop of the operation of cutting the paper core to a predetermined length, input of necessary data such as width W of paper tape (71), radius a of paper core,
And the like, and sends it to the microcomputer (81). An analog signal transmitted from an analog device such as a base cylinder rotation adjusting volume (84) of the data input means is converted into a digital signal by an A / D converter (85) provided in the control device (8). Then, it is transmitted to the microcomputer (81).

The control device (8) includes a servo controller for controlling the rotational drive of the servo motors (38) and (45) based on a control signal transmitted from the microcomputer (81).
(86) and (86) and amplifiers (87) and (8) that drive the servo motors (38) and (45) in accordance with signals from the servo controllers (86) and (86).
7) Further, the control device (8) controls the rotational drive of the other motors (12), (13), (14), and (22) based on a control signal transmitted from the microcomputer (81).
D / A converters (88) and (88) for converting the control signals (digital signals) into analog signals, and amplifiers (89) and (89) for driving motors according to the analog signals.

Next, a method of manufacturing the spiral paper tube according to the present embodiment will be described. First, before starting the production of the paper tube, the control device (8) is operated and the slide driving device is operated.
Slide table (40) and cutting device driven by (4)
(5) is a time Tc required to start a slide from the stop position and reach a predetermined constant speed (hereinafter, referred to as a constant speed arrival time), and a distance Dc (hereinafter, referred to as a constant speed) from the stop position at the time Tc. (Referred to as a constant speed reaching distance) and store it in the memory (82) together with the constant speed. The speed changes of the slide table (40) and the cutting device (5) from the stop position to the constant speed are as shown in FIG. 9, from which the constant speed reaching time Tc and the constant speed reaching distance Dc can be measured. Slide drive
Since (4) is driven by the servomotor (45), the speed change has reproducibility, and therefore, the constant speed arrival time Tc
The constant speed reach Dc depends only on a predetermined constant speed.
That is, if the constant speed is set in advance, the constant speed reaching time Tc and the constant speed reaching distance Dc are specified. The predetermined constant speed is:
Desirably, it is equal to the forming speed of the paper tube (7). Also, if the forming speed of the paper tube (7) can be selected from a plurality of speeds,
It is desirable that the constant speed reaching time Tc and the constant speed reaching distance Dc when the plurality of speeds are set to the predetermined constant speed be stored in the memory (82).

Next, the control device (8) is operated, and the paper tape
(71) width W and paper tube (7) radius a (or mandrel (2)
Is input from the control panel (80). Then, the microcomputer (81) calculates the optimum winding angle of the belts (23) and (24) with respect to the mandrel (2) from the input value, and adjusts the winding angle so that the winding angle becomes the winding angle. Servo motor (38)
To rotate the screw shafts (36) and (37),
The angle of the belt (23) (24) is adjusted by adjusting the opening angle of the belt. Next, the first belt on the upstream side of the paper tube manufacturing section (100)
Between (23) and the head (11), a first paper tape (71) is inserted from one side of the mandrel (2), and a second paper tape is inserted from the other side.
Paper tapes (72) and (73) of No. 3 are wound around the mandrel (2) diagonally toward the downstream side, and sandwiched between the first belts (23). Next, on the control panel (80), each of the base cylinders (3), (31), (3)
Set the rotation speed of the rotation drive motors (12), (13) and (14) in 2) and the rotation speed of the rotation drive motor (22) of the slide shaft (21), and turn on the paper tube forming switch (not shown). To Then, the microcomputer (81) operates the motors (1) of the base cylinders (3), (31), and (32).
2) The (13) and (14) are driven to rotate to rotate the first belt (23) and the second belt (24). The paper tapes (71), (72), and (73) are wound by the orbiting belts (23) and (24) to form a paper tube continuously, and are sent to the downstream side of the mandrel (2) by the winding force. Is transferred to the core axis (43). Also,
The microcomputer (81) is a motor for the slide shaft (21).
The slide shaft (21) is rotated by rotating the (22). The microcomputer (81) is a slide drive device.
By driving the servo motor (45) of (4) to move the slide table (40) to the upstream side, when the detection signal from the limit switch (15) is received, the movement of the slide table (40) is stopped.

Then, when the leading end of the formed paper tube reaches, for example, the stop position of the cutting device (5), the control panel
A paper tube cutting switch (not shown) of (80) is turned on to start cutting the paper tube. At this time, the microcomputer (8
The operation of cutting the formed paper tube to a predetermined length (cut length) under the control of 1) will be described with reference to FIGS.
First, the supply amount counter (83) is reset (S1), and after a lapse of a predetermined period, the rotation speeds of the base cylinder rotation drive motors (12), (13), and (14) are fixed to fix the paper tube forming speed. Then, a lock mode is set in which input of correction data and the like from the control panel (80) is not accepted (S2). Conversely, before entering the lock mode, the rotation speed of the motors (12), (13), and (14) is changed by the base cylinder rotation adjusting volume (84) provided on the control panel (80) to change the paper speed. The formation speed of the tube can be changed, or correction data etc. from the control panel (80) can be
Can be entered in 1). Note that, after the elapse of the predetermined period, if the cutting device (5) can specify the time to start the progress and can start the progress of the cutting device (5) at the time, the predetermined period is:
An arbitrary period can be selected from the start time of the cutting operation or the previous paper tube cutting time. At this time, the paper tube forming speed v0 fixed after the elapse of the predetermined period is determined by calculating the supply amount L of the paper tape (71) calculated from the supply amount counter (83) and the above-described equation P = W
It is determined based on L / (2πa).

Next, the constant speed reaching time Tc and the constant speed reaching distance Dc when the predetermined constant speed of the slide table (40) and the cutting device (5) are equal to the fixed forming speed v0 of the paper tube.
Is obtained from the relationship of FIG. 9 stored in advance (S3).
A plurality of different velocities and a corresponding constant speed arrival time T
c and the data of the constant speed reach Dc are stored in the memory (82) in advance.
Can be entered. In this case, a constant speed corresponding to the fixed paper tube forming speed v0 is searched from the data stored in the memory (82), and the constant speed reaching time Tc and the constant speed reaching distance Dc for the matching constant speed are determined. It only needs to be read from the memory (82). If the constant speed corresponding to the fixed forming speed v0 is not stored in the memory (82),
Among the constant speeds stored in 2), the constant speed reaching time Tc and the constant speed reaching distance Dc relating to the constant speed close to the fixed forming speed v0 are read out, interpolation calculation is performed, and the constant speed equal to the fixed forming speed v0 is calculated. The constant speed arrival time Tc and the constant speed arrival distance Dc may be calculated. Next, from the cutting length L0 of the paper tube, the fixed forming speed v0 of the paper tube, the calculated constant speed reaching time Tc and the calculated constant speed reaching distance Dc, the slide table (40) and the cutting device are used.
At the point of time when the feed drive in (5) is to be started, the formation length Ps of the paper tube from the leading end of the already formed paper tube to the stop position of the cutting device (5) is calculated using the following equation (S4). ). Ps = L0 + Dc−v0 × Tc

When the formation length of the paper tube calculated by the supply amount counter (83) reaches the drive start formation length Ps, the slide driving device (4) is driven, and the slide table (4) is driven.
0) and the cutting device (5) starts to move downstream from the stop position (FIG. 8A). At the same time, the supply amount counter (83) is reset (S5). Subsequent count values are used for the next paper tube cutting control. Slide stand (40) and cutting device (5)
When the constant speed arrival time Tc has elapsed since the start of the movement of the paper tube, the length of the paper tube formed from the leading end of the paper tube to the stop position of the cutting device (5) is L0 + Dc. Furthermore, a cutting device (5)
Reaches a position that is a distance Dc from the stop position, and has a speed equal to the paper tube forming speed v0 (FIG. 8B). At this time or thereafter, the cutting device (5) operates to cut the paper tube (7) (S6) (FIG. 8 (c)). With this, the paper tube
(7) is cut to the set cutting length L0. Also a paper tube
Since the forming speed of (7) is equal to the moving speed of the cutting device (5), the paper tube (7) is cut perpendicular to the central axis. When the cutting of the paper core is completed, the lock mode is released. Paper tube
After cutting in (7), the paper tube cut to the set cutting length L0
(74) is pushed out by the paper tube (7) which is subsequently formed and discharged from the free end of the core axis (43), and the slide table (40) and the cutting device (5) are driven by the slide drive device (4). (S7) (FIG. 8D). If the production of the paper tube is to be continued (S8), the process returns to step S2 and the above operation is repeated. As a result, the paper tube 7 can be repeatedly cut to the set cutting length L0.

As described above, in the present invention, the comparison step for checking whether or not the position where the paper tube should be cut and the position of the cutting device (5) coincide with each other is unnecessary, so that the response speed of the control for cutting is eliminated. Therefore, even if the paper tube is manufactured at a speed of 50 to 60 m per minute, cutting of a set length is possible. Further, since there is no need to know the current position of the cutting device (5) during movement, there is no need to provide a current position counter (310). That is, the sensor means used in the present invention may be only the sensor means (in this embodiment, the rotary encoder (63)) for detecting the forming speed or the forming length of the paper tube. In addition, during periods other than the lock mode period, it is possible to change the paper tube forming speed, change the cutting length, correct the calculation formula, and the like, so that various changes and adjustments can be made without stopping the manufacturing apparatus. In addition, the changes and adjustments are immediately reflected in the next disconnection.

As shown in FIG. 3, a plurality of cutting devices (5), (5a), (5b), (5c) and (5d) are provided on a guide bar (44) of a slide base (40) so as to be adjustable in interval. However, by simultaneously operating or sequentially operating from the downstream side, a plurality of paper tubes of a set length can be cut at a time, thereby further improving the efficiency. Further, in the above embodiment, the formation length Ps of the paper tube at which the feed drive of the slide table (40) and the cutting device (5) should be started is calculated, but the time Ts at which the feed drive should be started may be calculated. . In this case, the length P0 of the core formed between the previous cutting and the fixing of the core speed is measured, and is calculated using Ts = (L0 + Dc-P0) / v0-Tc. Become.

In the practice of the present invention, the formation length of the paper tube was calculated from the supply amount of the paper tape (71).
There is a risk that the edges of the paper tape (71) may overlap or open on the mandrel (2), or there may be an error in the length of the paper tube formed due to slippage between the detection roller (64) and the paper tape. is there. Therefore, a non-contact type sensor (103) that can measure the speed of the moving object from the Doppler shift of the reflected light or from the speckle pattern generated by the interference of the reflected light by irradiating the laser light to the surface of the moving object is used as a core axis. (43) It is arranged toward the transition path of the paper tube above, and the sensor (103) accurately measures the formation speed of the paper tube, and inputs the measured speed to the control device (8). Alternatively, the paper tube may be cut.

The description of the above embodiment is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. or,
The configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

 [Brief description of drawings]

FIG. 1 is a plan view of a paper tube manufacturing apparatus.

FIG. 2 is a front view of a paper tube manufacturing unit.

FIG. 3 is a front view of a paper tube cutting unit.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a perspective view of a brazing device.

FIG. 6 is a block diagram of a control device.

FIG. 7 is a flowchart illustrating a paper tube cutting operation according to the present embodiment.

FIG. 8 is a schematic view showing a cutting operation of a paper tube in the present embodiment.

FIG. 9 is a graph showing a temporal change in speed until the slide table and the cutting device start moving and reach a constant speed in the cutting operation of the embodiment.

FIG. 10 is a plan view when the formed paper tube is cut open along an axis.

FIG. 11 is a front view of a conventional paper tube manufacturing apparatus.

FIG. 12 is a block diagram of a conventional control device.

FIG. 13 is a flowchart showing a conventional paper tube cutting operation.

[Explanation of symbols]

 (1) Base (2) Mandrel (23) Belt (24) Belt (4) Slide drive (40) Slide table (5) Cutting device (6) Brazing device (7) Paper tube (8) Control device

Claims (3)

[Claims] 1. A paper tape is continuously fed to a distal end side of a mandrel while spirally winding a paper tape around a mandrel (2) having a base end supported, and is movable in a traveling direction of the paper tube while forming a paper tube. In a method for manufacturing a spiral paper tube, in which the paper cutting device (5) is cut while moving the cutting device (5) at the same speed as the paper tube, a. Stopping the cutting device (5) at a predetermined stop position and waiting; b. The constant forming speed v0 of the paper tube (7) and the cutting device (5)
Starts moving from the stop state, and the paper tube forming speed v0
When the paper tube (7) is formed at the length Ps calculated from the period Tc until the speed becomes equal to and the distance Dc to advance to the period, c. The traveling speed of the cutting device (5) is equal to the forming speed v0 of the paper tube (7).
The cutting device (5) cuts the paper tube (7) after the speed becomes constant, and d. The cutting device (5) returns to the original stop position,
A method of manufacturing a spiral paper tube. 2. A paper tape is continuously fed out while spirally winding a paper tape around a mandrel (2) having a base end supported, thereby forming a paper tube while being movable in a traveling direction of the paper tube. In a spiral paper tube manufacturing apparatus for cutting a paper tube (7) while moving a cutting device (5) at the same speed as the paper tube, a. Means for stopping the cutting device (5) at a predetermined stop position and waiting; b. The constant forming speed v0 of the paper tube (7) and the cutting device (5)
Starts moving from the stop state, and the paper tube forming speed v0
Means for starting the advance of the cutting device (5) when the paper tube (7) is formed in the length Ps calculated from the period Tc until the speed becomes constant and the distance Dc to advance in the period, c. The traveling speed of the cutting device (5) is equal to the forming speed v0 of the paper tube (7).
After the constant speed, the cutting device (5) cuts the paper tube (7); d. Means for returning the cutting device (5) to its original stop position. 3. A sensor device for detecting a forming speed or a forming length of a paper tube, wherein the sensor device outputs a laser beam to the paper tube.
The spiral paper tube manufacturing apparatus according to claim 2, wherein the non-contact sensor (103) is incident on the side wall of (7), and calculates a forming speed of the paper tube using the Doppler effect.