JPH0911366A - Paper tube manufacturing device - Google Patents

Abstract

PURPOSE: To manufacture a paper tube with its cut end not to be deformed by making the forward movement speed of a cutting core shaft and a cutter stand conform perfectly to the various axial direction growing speeds of the paper tube being wound obliquely on a static shaft and growing thereon. CONSTITUTION: In a paper tube manufacturing device disposed in tension between a couple of pulleys 8 and growing a paper tube while winding obliquely a paper tape fed obliquely onto the static shaft by an endless winding and driving belt crossing obliquely the static shaft 11 and wound by one round, a cutting core shaft 26 is connected in the extended state with the front end of a rotating spindle running through the static shaft. Simultaneously the rear end of a sliding roll in parallel with the rotating spindle and connecting a cutter stand 28 with its front end is connected with the rear end of the rotating spindle by a connector 15, and a ball screw shaft 23 driven by a servo motor 24 with an encorder is screw engaged with the connector, and the connector, the cutting core shaft and the cutter stand are moved forward at the equal speed to the axial direction growing speed of the paper tube by the rotation of the ball screw shaft performed by the servo motor and the paper tube is cut by a cutter on the cutter stand during the forward movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tape which is stretched between a pair of pulleys and is diagonally wound around a static shaft once by an endless winding drive belt. The present invention relates to a paper tube manufacturing apparatus for adhering a superposed portion of a paper tape to form a paper tube while screwing it forward and cutting it into a predetermined length.

[0002]

2. Description of the Related Art Such a paper tube manufacturing apparatus is disclosed in Japanese Patent Publication No. 52-17568 and Japanese Patent Publication No. 53-5 proposed by the present applicant.
No. 29, Japanese Patent Publication No. Sho 53-2208, and Shokai Sho 54
Japanese Patent Publication No. 24524, Japanese Utility Model Publication No. 61-3617, Japanese Utility Model Publication No. 61-41731, and the like.
These paper tube manufacturing apparatuses have a hollow static shaft horizontally supported by a cantilever at the rear end thereof, and are stretched between a pair of pulleys supported by the aircraft and obliquely intersect with the static shaft. An endless winding drive belt that is wound diagonally once around the outer circumference, a rotating spindle that penetrates the static shaft and can slide in the front-rear direction, and an extended shape extending from the free end of the static shaft to the front end of the rotating spindle. A core shaft that is connected and rotates and slides integrally with the rotary spindle, and a cutter that supports the core shaft from below and that comes into contact with and separates from the shaft are mounted, and are slidably supported on the machine body in the front-rear direction. A sliding rod supported by the body in parallel with the cutter table, the cutting axis and the rotating spindle, and slidable in the front-rear direction by connecting the cutter table to the front end, and the sliding rod and the rear end of the rotating spindle With a joint that connects the overlapping parts of the paper tape The paper tube to be screwed is screwed on the core axis from the free end of the static shaft, and the paper tube is cut to a predetermined length from directly above by the cutter mounted on the cutter base on the core axis. is there. For this reason, the lower end of the swing arm is pivotally attached to the base of the aircraft, and the upper end of the swing arm that swings back and forth by the crank is connected to the cutter table to move the cutter table forward and backward. The shaft is transmitted to the axis through the sliding rod, the connecting body, and the rotating spindle, and the axis is advanced and retracted in synchronization with the cutter table.

[0003] As described above, the cutter table and the core axis advance and retreat at an angular velocity based on the forward and backward swinging of the upper end of the swing arm with the lower end as a fulcrum, so that the speed during forward and backward movements is not constant. Therefore, the length of the cutting axis is slightly longer than the cutting length of the paper tube, and the cutters are installed at the front end and the rear end of the cutter table. The angular velocity when passing through the dead center from the rear to the front approximately matches the axial growth velocity of the paper tube growing while screwing, and at that time, the cutter at the front end on the cutter table,
The cutter at the rear end is simultaneously operated, and the front end of the paper tube is slightly cut off to form a paper tube of a predetermined length, and this paper tube is pushed out from the front end of the core axis at the front end of the succeeding paper tube.

[0004]

[Problems to be Solved by the Invention]
When changing the width of the paper tape for advancing the overlapped portion while adhering the overlapped portion to form the paper tube, it is necessary to change the oblique angle at which the winding drive belt intersects the static axis to the required angle.
Also, when changing the static shafts with different diameters to manufacture paper tubes with different diameters, it is necessary to change the angle at which the winding drive belt intersects the static shaft to the required angle, depending on the width of the paper tape used. There is. In either case, the growth rate in the axial direction of the paper tube that grows while spiraling changes. In the conventional device, the cutter is activated when the rocking arm passes through the top dead center from the rear to the front while the cutter base and the cutting core shaft are moving forward to cut the paper tube during growth. , When the axial growth speed of the paper tube changes variously, it is difficult to match the angular speed at which the rocking arm passes through the top dead center from the rear to the front, to various growth speeds in the axial direction of the paper tube. Skilled skills are required.

Furthermore, since the angular velocity at which the rocking arm passes from the top dead center to the front after the dead center is approximately matched to the growth velocity in the axial direction of the paper tube, the cutting core axis at that time and the cutter table The advancing speed does not exactly match the axial growth speed of the paper tube. Therefore, when the cutter of the cutter table cuts the paper tube to cut the paper tube, the cutter slightly deforms the paper tube under the influence of the speed difference, so that the paper tube cut becomes unsightly.

[0006]

SUMMARY OF THE INVENTION The present invention was developed in order to solve the above-mentioned problems of the prior proposals, and a hollow static shaft having a rear end portion cantilevered and horizontally supported by an airframe is provided. , Is stretched between a pair of pulleys supported by the machine body and crosses the static axis at an angle and is wound once, and the paper tape that is diagonally supplied to the outer periphery of the static axis is wound around the static axis at a slant to the paper tube. An endless winding drive belt for growth, a rotary spindle that penetrates the static shaft and is slidable in the front-rear direction, and is extendedly connected to the front end of the rotary spindle protruding from the front end of the static shaft to grow on the static shaft. A cutting core shaft on which the formed paper tube fits and grows, a sliding rod supported by the machine body in parallel with the rotary spindle and slidable in the front-back direction, and a rear end of the slide rod and the rotary spindle. The cutting core shaft that is connected to the front end of the sliding rod and the connecting body that connects the parts to each other. In a paper tube manufacturing apparatus equipped with a cutter base that is supported from below and that is capable of sliding in the front-rear direction and that is equipped with a cutter that comes in contact with and separates from a cutting core shaft, in parallel with the static axis, screwed with the connecting body The machine is provided with a ball screw shaft and a servomotor with an encoder capable of rotating and rotating the screw shaft, and the servomotor with an encoder is used to rotate the ball screw shaft in the forward and reverse directions to move the connected body forward and backward. During the forward movement, the cutting core shaft and the cutter base are advanced at the same speed as the axial growth speed of the paper core, and the paper core on the cutting core shaft is cut by the cutter of the cutter base. Characterize. Then, connect the rear end of the rotary spindle that connects the cutting core shaft to the front end and the rear end of the sliding rod that has the cutter base attached to the front end, and finally move the connecting body that moves the cutting core shaft and the cutter base forward and backward together. It is preferable to stop and wait at a position where the forward movement is started from the position.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the illustrated embodiments, reference numeral 11 denotes a hollow static shaft horizontally supported by a cantilever at the rear end of the body 1 and 12 denotes a static shaft stretched between a pair of pulleys supported by the body. An endless winding drive belt obliquely intersecting with the shaft and having a drive band wound around its outer circumference once, 13 is a rotating spindle which can pass through the static shaft and can slide in the front-rear direction, and 14 is a body parallel to the rotating spindle. A sliding rod slidable in the front-rear direction supported by
Denotes a connecting body for connecting the sliding rod and the rear ends of the rotary spindle, and these are known members described in the above-mentioned prior proposals.

The machine body 1 includes a base fixed on the floor, a headstock 2 erected on the rear end of the base, and a fixed table 3 which is lower than the headstock and is installed in front of it. Consists of. A short attachment / detachment tube 16 for detachably supporting the static shaft 11 is provided on the upper front surface of the headstock, and the static shaft is horizontally supported by a cantilever having a rear end fixed to the attachment / detachment tube. Detachable cylinder 1
Reference numeral 6 is for fixing and using a static shaft having a diameter corresponding to each diameter of a paper tube to be manufactured.

On the table 3, two arms 5 and 7 diagonally traversing the lower part of the static axis are pivotally mounted in an X-shape at a fulcrum 0 deviating from the perpendicular of the center line of the static axis, and both ends of the arm 5 are supported. A pair of pulleys 6 and 6 ', and a pair of pulleys 8 on both ends of the arm 7,
An endless winding drive belt in which a pair of pulleys 8 'are rotatably erected, and a part of the drive band is wound obliquely once around the outer periphery of a static shaft between a pair of pulleys 6 and 6' and between 8 and 8 '. 12-I and 12-
II is installed. One of the paired pulleys 6, 8 is driven to rotate by a motor M1, a speed reducer, and a pulley, the rotation of which is transmitted via a fulcrum 0, whereby winding drive belts 12-I, 12 are driven.
-II circulates, and the winding portions 17-I and 17-II of the drive band, which are obliquely wound once around the outer periphery of the static shaft, perform a diagonal slip rotation on the outer periphery of the static shaft. The winding part 17-I and the winding part 17
-II winding directions with respect to the static axis are opposite to each other,
Winding drive belt 12 stretched between pulleys 8 and 8 '
For example, when two tapes of the same width coated with an adhesive are supplied to the rear winding portion 17-II so as to overlap one half of the width, both tapes are statically moved by the winding portion 17-II. It is drawn into the outer periphery of the shaft, spirally wound around, and the other half of the width is spirally rotated toward the free end of the static shaft while being adhered together (screw advance), and then the pulley 6 , 6 ', the front winding portion 1 of the winding drive belt 12-I
While being wound around the static axis again by 7-I, the screw advances and passes through the winding portion 17-I, thus rotating spirally toward the free end of the static axis to form a paper tube and grow. I do.

The winding drive belts 12-I and 12-II are slanted to the static axis in accordance with changes in the width of the tape or replacement of the static axes corresponding to the diameters for manufacturing paper tubes having different diameters. In order to adjust the winding angle for winding, the table 3 holds the intermediate portion of the turnbuckle shaft 4 in the front-rear direction, which can be rotated by a handle, rotatably, and the idle pulleys of the arms 5 and 7 are rotated. At the ends having 6'and 8 ', nuts 5'and 7'can be moved in the longitudinal direction of the arm,
The front part of the turnbuckle shaft is threaded through the nut 5 'and the rear part thereof is threaded through the nut 7'. Therefore, by turning the turnbuckle shaft in the forward / reverse direction with the handle 4 ', the arm 5,
7 around the fulcrum 0, and the winding portion 17-
The angle at which I and 17-II wind around the static axis can be adjusted to be large or small. The idle pulleys 6 ', 8 of each arm
′ Is set up on a slide table that can slide in the longitudinal direction of the arm,
Each slide table is pressed toward the end so that a required tension can be applied to the winding drive belts 12-I and 12-II.

A bearing cylinder 18 is provided on the rear wall of the headstock so as to face the removable cylinder 16 on the front surface, and the rotary spindle 1 is provided in the cylinder.
The rotating cylinder 19 of the internal teeth which transmits the rotation to 3 is rotatably held. The rotary cylinder 19 is driven by a motor M2, a speed reducer, and a pulley at a front end protruding from the front end of the bearing cylinder 18 to rotate.

Reference numeral 20 denotes a spline shaft which is detachably connected to the rear portion of the rotary spindle 13 which extends through the static shaft 11 and extends rearward so as to rotate integrally with the rotary spindle 13 and extends rearward.
The spline shaft 20 engages the spline on the outer periphery with the internal teeth of the rotary cylinder 19 and projects rearward from the rear end of the cylinder 19. A rearward-facing shelf 21 is provided on the rear wall of the headstock below the spline shaft 20, and a connector 15 is slidably mounted on the shelf along a front-rear guide 22. The rear end of the shaft 20 is rotatably connected to the connecting body. Further, the rear end of the sliding rod 14 which is slidably supported by penetrating the headstock in the front-rear direction immediately below the rotary spindle is connected to this connecting body. Therefore, the rotating spindle 13 and the spline shaft 20 and the sliding rod 14 slide forward and backward integrally by sliding the connecting body 15 in the front-back direction.

Reference numeral 23 is a ball screw shaft which is parallel to the static axis and which is screwed through the connecting body 15 in the front-rear direction, and 24 is a servomotor with an encoder capable of rotating and driving the ball screw shaft. The rear end of the ball screw shaft and the servomotor are supported by a rear support piece 25 standing on the rear end of the shelf 21, and the front end of the ball screw shaft is supported by the rear wall of the headstock. When the servo motor 24 rotates forward to rotate the ball screw shaft 23, the coupling body 15 screw-engaged with the screw shaft grows on the static shaft while spirally rotating toward the free end of the static shaft. Moving forward at the same speed as the growth speed of the paper tube,
When the servo motor rotates in the reverse direction to rotate the ball screw shaft, the connected body moves backward at the same speed as the forward speed. The rotating spindle 13, the spline shaft 20, and the sliding rod 14 move forward and backward integrally with the forward and backward movement of the connecting body. Linked body 15
The front end of the rotary spindle 13 projects slightly forward from the front end of the static shaft 11 even when the front end of the rotary shaft 13 is at the rearmost position on the shelf.

A short cutting core shaft 26 is provided at the front end of the rotary spindle.
Are connected in an extended manner. Conventional paper tube making machine has a length of 2
When manufacturing a paper tube having a length of 2.3 m, it was necessary to connect a core shaft having a length of 2.3 m, and when manufacturing a paper tube having a length of 1.5 m, a core shaft having a length of 1.8 m was required. In this embodiment, regardless of the length of the paper tube to be manufactured, the length of the core axis is constant, and the stroke of the connecting body 15 which moves forward and backward by the servomotor 24 and the ball screw shaft 23 which rotates forward and backward is 300 mm. In some cases, it may be about 500 mm, which is slightly longer.

To the front end of the sliding rod 14 is connected a cutter base 28 which is slidably supported in the front-rear direction by a guide 27 on the front end of the table 3. The cutter table 28 is circumscribed from below on the core axis and supports a pair of rotatable support rollers 29 and 29 supporting the core axis. A cutter 30 is provided for cutting the paper tube into slices, and a cutter actuator 34 is provided.

In the conventional paper tube manufacturing machine, when a paper tube having a length of 2 m is manufactured similarly to the cutting core shaft, the cutter base needs to have a length of 2.3 m in the front-rear direction. Then, regardless of the length of the paper tube to be manufactured, it may be about 150 mm.

The cutter 30, as shown in FIGS.
In this embodiment, a holder 32 consisting of two arms pivotally attached and fixed in an X-shape, and two round blades rotatably attached to the lower ends of both arms of the holder and cut from both sides of the paper tube from above. 31, 31 and a turnbuckle 33 connecting the upper ends of both arms. Each time the round blade becomes poorly sharpened, it is polished to improve its sharpness. As a result, the diameter of the round blade gradually decreases, and in this case, the turnbuckle is rotated to increase the distance between the upper ends of both arms of the holder, thereby narrowing the distance between the lower ends of both arms of the holder. , 31 are brought close to each other, and the round blade circulates the cutting core shaft to cut the paper tube when the holder descends by a predetermined distance (see FIG. 6B).

In this embodiment, the cutter actuating device 34 has an intermediate part pivoted at a fulcrum 35 'to the upper end of a supporting column 28' which stands from the cutter table, and one end of which is located above the pair of rollers 29, 29. The cylinder end is pivotally attached to the tip of a V-shaped swing arm 35 whose end projects horizontally outward from the side of the cutter base, and the tip of a bracket 36 which projects outward from the side of the cutter base, and the piston end is oscillated. An air cylinder 37 pivotally attached to the other end of the moving arm, a roller 38 pivotally attached to the other end of the swing arm, and a column 3 standing upright on the front of the bed 3 of the airframe.
The cam follower 40 is attached to the front and back direction of the table 3, and the roller 38 is provided on the cam follower 40 contacting from below and the extension table 9 connected to the front end of the table 3 forward, and grows while screwing over the front end of the core axis. And a photoelectric sensor 41 for detecting the front end of the paper tube. On the extension table 9, a pair of rollers 10, 1 long in the front-rear direction supporting the paper tube by circumscribing from below the growing paper tube while screwing beyond the front end of the core axis.
0 is provided, and the photoelectric sensor 41 is installed near the roller.

In order to attach the holder 32 of the cutter 30 to the swing arm 35, as shown in FIG. 7, a bearing tube portion 42 is provided at one end of the arm 35, a collar 44 is provided, and two arms of the holder are provided at the front end. The second half of the holder mounting shaft 43, in which the X-shaped pivot portion is fixed by tightening the nut 45, is rotatably held by penetrating the bearing tubular portion 42, and between the front of the bearing portion and the collar 44. Then, the coil spring 46 in a neutral state is fitted to the holder mounting shaft, the front and rear ends of the spring are bent in the axial direction, and the front bent portion 46a of the spring is inserted into the collar 44 and the rear bent portion 46b is inserted into the bearing tubular portion 42. Then, the circular blade mounting shafts 31 ', 31' at the lower ends of the two arms of the holder are kept on the same horizontal line. As described above, when adjusting the distance between the lower ends of both arms of the holder with the turnbuckle 33, the nut 45 is loosened.

When the holder is rotatably attached to the swing arm via the neutral coil spring 46 in this way, when both round blades 31 and 31 are lowered to cut both sides of the paper tube from above, When the diameter of one of the round blades is smaller than that of the other round blade due to polishing or the like, the round blade having the larger diameter comes into contact with the paper tube and is pushed up first, as shown in FIG. 6C. Along with this, the holder rotates in the clockwise or counterclockwise direction against the coil spring 46, and the round blade with the smaller diameter also contacts the paper tube, and the paper tube is cut by both round blades. When the cutting is completed and both round blades are pulled up, the coil spring returns to the neutral state, and the holder rotates in the opposite direction and recovers.

When the connecting body 15 is in the retracted position on the shelf 21, the roller 38 provided on one end of the swing arm 35 of the cutter actuating device 34 comes into contact with the rear end of the cam follower 40 from below, and the air follows. The cylinder 37 presses the roller 38 against the cam follower by the extension force.

The servomotor 24 rotates in the forward direction to rotationally drive the ball screw shaft 23, whereby the connecting body 15, the rotary spindle 13 and the cutting core shaft 26, the sliding rod 14 and the cutter base 2 are driven.
When the roller 8 starts to move forward as a unit, and moves forward by about half of the stroke amount, the roller 38 passes below the cam follower by passing under the front slope 40 'provided at the front end of the lower surface of the cam follower. As a result, the air cylinder 37 extends the piston and swings the swing arm 35 in the clockwise direction in FIG. 6 about the fulcrum 35 ', and the holder 32 having the two round blades of the cutter attached thereto descends accordingly. On the part supported by the support rollers 29, 29 of the cutting core shaft 26 from below, the round blade 31,
31 cuts the paper tube by contacting both sides of the paper tube from above.
In this way, both round blades contact both sides of the paper tube from above and cut the paper tube. Therefore, the cutting core shaft slightly sways as compared with the case where one round blade cuts the paper tube from directly above. The paper tube can be stably cut even when it turns, and the two round blades cooperate to cut, so the service life of the round blade and the replacement period are extended.

When the cutter table 28 reaches the forward end, the rotation of the servo motor changes to reverse rotation, and at the same time, the air cylinder 3
7, the piston is shortened, the swing arm 35 swings counterclockwise in FIG. 6, the cutter rises, and the roller 38 is located below the lower surface of the cam follower. Thus, the cutter table is retracted integrally with the connecting body 15.

In this embodiment, as shown in FIGS. 4 and 5, the connecting member 15 is always stopped and stands by at a position advanced by a predetermined distance, for example, 10 mm from the retracted position. Assuming that the stroke amount of the connecting body is, for example, 300 mm, as shown in FIG. 9, the connecting body moves forward by 290 mm by the forward rotation of the servo motor, then retreats by 300 mm by the reverse rotation of the servo motor, and then advances by 10 mm by the forward rotation of the servo motor. Stop at the stop position and wait. The forward / backward distance of the coupled body and the forward / reverse rotation of the servomotor are controlled by an encoder incorporating a pulse of the rotation speed of the servomotor. Thus, the connecting body 1
5 and the cutting core shaft 26 and the cutter base 28 move forward to cut the paper tube, the connecting body moves backward and then stops at the advanced position for a predetermined distance and stands by. Therefore, the ball screw shaft 23
Backlash between the ball screw shaft and the nut incorporated in the coupling body that is screw-engaged (allowable mesh gap)
Without this, the cutter table and the core axis start moving forward, so that the variation in the length of the cut paper tube can be eliminated.

The connecting body 15, the cutting core shaft 26 and the cutter base 2
The forward speed and the backward speed of 8 are determined by the pitch of the screw of the nut incorporated in the ball screw shaft 23 and the coupling body screw-engaged with the shaft, and the rotational speed (RPM) of the servo motor for driving the ball screw shaft. Is determined. In this case, since the pitch of the screw is constant, by controlling the number of rotations of the servomotor, the forward speed of the coupled body and the core shaft 26 or the cutter table can be adjusted by the axis of the paper tube on the static axis or the core axis. Different growth rates in the direction can easily be matched.

Therefore, the rotary spindle 13 and the cutting shaft 26
Rotates, and the wrapping drive belt 12 circulates and the static shaft 1
On top of this, a paper tape is grown spirally around the free end of the static shaft as a paper tube while being wound spirally, and the front end of the paper tube exceeds the free end of the static shaft to reach the core shaft 26 and is further extended. The pair of rollers 10, 10 of the table 9 is advanced to the photoelectric sensor 4.
When detected at 1, the photoelectric sensor commands the servo motor 24 to operate. As a result, the servomotor rotates forward to rotate the ball screw shaft 23 to advance the connecting body 15 at the same speed as the axial growth speed of the paper tube. The shaft advances integrally while rotating, and the cutter table 28 connected to the connecting body by the sliding rod 14 also advances integrally. Then, when the cutter table moves forward and the roller 38 pivotally mounted on the other end of the swing arm 35 advances under the cam follower 40 and passes by, the swing arm swings by the extension force of the air cylinder 37. The cutter 30 is lowered to cut the rear end of the paper tube on the core axis.

For example, when the connecting body and the cutter base advance 120 mm from the stop position and the cutter cuts the paper tube, as shown in FIG. 10, when manufacturing a paper tube having a length of 2 m, the cutter at the stop position is used. The photoelectric sensor 41 may be installed on the extension table 2 m in front of.

Therefore, as shown in FIG. 11, a plurality of photoelectric sensors 41 are provided near the rollers 10, 10 on the extension table.
a, 41b and 41c are installed at a distance of 1.5 m, 2.0 m and 2.5 m in front of the cutter at the stop position, for example, so that the changeover switch 47 can select a photoelectric sensor which commands the servo motor 24. The length is 1.
5m, 2.0m and 2.5m paper tubes can be manufactured.

Further, as shown in FIG. 12, a guide 48 in the front-rear direction is provided near the rollers 10, 10 on the extension table,
The photoelectric sensor 41 is mounted so as to be movable and adjustable along this guide, and the mounting position of the photoelectric sensor is adjusted to 1.5 m, 2.0 m, and 2.5 m in front of the cutter at the stop position to fix the photoelectric sensor 41. 1.5 length with photoelectric sensor
m, 2.0 m, and 2.5 m can be manufactured.

Further, as shown in FIG. 13, a photoelectric sensor 41 is installed in front of the cutter at the stop position, at a predetermined position, for example, near the rollers 10 on the extension table of 1.5 m, and the photoelectric sensor and the servo motor are installed. If an adjustable timer 49 is connected between 24 and, for example, the time required for the paper tube to grow 50 cm is 3 seconds, the timer is set to 0 seconds and the photoelectric sensor instructs the servo motor at 0 seconds. 1.
After manufacturing a 5 m paper tube, the timer is set to 3 seconds and the photoelectric sensor issues a command. After a delay of 3 seconds, the timer transmits the command to the servomotor to manufacture a 2.0 m long paper tube. Alternatively, the timer can be set to 6 seconds, and the command of the photoelectric sensor can be transmitted to the servomotor with a delay of 6 seconds to manufacture a 2.5 m long paper tube.

In the illustrated embodiment, the cutter actuator 34
Is composed of a swing arm 35 having a cutter attached to one end, a roller 38 at the other end, a cam follower 40 with which the rollers are in sliding contact, and an air cylinder 37. May be biased to a non-cutting position by a spring, and may be operated to a cutting position by an electromagnet.

Further, on one side of the rollers 10, 10 of the extension table 9, the rollers 10, 1 are kept at a predetermined interval in the front-rear direction.
An air nozzle 50 for blowing air toward the paper tube on the upper side is installed. After the cutter table moves forward, the paper tube is cut by the cutter, and when the cutter table starts retreating, the air nozzles 50 operate from the air nozzles. And the rollers 10,
Preferably, the paper tube lying on 10 is rolled off from the rollers and the extension table by air so that the next growing paper tube can be supported on rollers 10,10.

In the illustrated embodiment, two winding drive belts are used, and two arms having pulleys for tensioning the both belts attached to each end are pivotally mounted in the X-shape at the fulcrum 0. It is not necessary, the first of the above Japanese Patent Publication No. 52-17568.
As shown in FIG. 2 and FIG. 2, the two arms may be arranged in a C-shape and pivoted at separate fulcrums, or may be V-shaped and pivoted at one fulcrum. The number of arms need not be two, but may be one, as in a conventional two-pulley type, and the number of winding drive belts may be one.

Further, as shown in the above-mentioned Japanese Utility Model Publication No. 61-41731, a strut is erected on the intermediate portion of the base between the cutter base and the headstock so as to be positioned behind the static shaft. An arm having a drive belt stretched around a horizontal fulcrum in a direction orthogonal to the static axis may be pivotally attached to the front surface.

Further, in this embodiment, the length of the cutting core and the cutter base is shortened, and the rear end of the paper tube being grown is cut by one cutter on the cutter base.
Use a cutting core axis and a cutter base that are slightly longer than the length of the paper core obtained by cutting, and operate both the front cutter installed on the front end of the cutter base and the rear cutter installed on the rear end at the same time. Alternatively, the cutting may be performed.

[0036]

As is apparent from the above description, in the present invention, the ball screw shaft which is rotationally driven by the servomotor with the encoder which can be rotated forward and backward is penetrated through the connecting body which advances and retreats the cutting axis and the cutter base integrally. The ball screw shaft is rotated forward and backward by the servo motor to move the connected body, the center axis, and the cutter table forward and backward.By adjusting the rotation speed of the servo motor, the connected body and the center The forward speed of the shaft and the cutter table can be easily matched with the axial growth speed of the paper tube that grows while being screwed on the static shaft and the core axis. Therefore, it is easy to manufacture paper tubes of the same diameter using tapes of different widths on the same static axis, or to manufacture paper tubes of different diameters by replacing static axes with different diameters. Further, since the advance speed of the cutting axis and the cutter table coincides with the growth speed of the paper tube in the axial direction, the cut of the paper tube by the cutter is not deformed and is not unsightly.

Then, as described in claim 2, the connecting body for connecting the rear end of the rotary spindle and the rear end of the sliding rod is stopped and waited at a position where the forward movement is started from the last retracted position. Then, when the paper tube is cut next time, the ball screw shaft and the cutter built into the cutter stand without backlash (allowable meshing gap) between the ball screw shaft and the nut incorporated in the connecting body screw-engaged with the ball screw shaft. Since the cutting core shaft starts to move forward, it is possible to eliminate the variation in the length of the cut paper tube.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a paper tube manufacturing apparatus according to the present invention.

FIG. 2 is an elevation view of FIG.

FIG. 3 is a perspective view of a rear part of the body of FIG. 1;

FIG. 4 is a plan view of FIG.

FIG. 5 is a partially cut away elevation view of FIG. 4;

6A is a front view of the cutter and the cutter operating device of FIG. 1, FIG. 6B is a front view when the cutter cuts the paper tube, and FIG. 6C is a front view of two round blades having different diameters. It is an expanded sectional view showing the state where cutting is performed.

FIG. 7 is an elevational view of FIG. 6 (A) and an enlarged sectional view of a part thereof.

FIG. 8 is a plan view of FIG.

FIG. 9 is an explanatory diagram showing that the connected body is controlled to advance and retreat by an encoder built in the servomotor.

FIG. 10 is an explanatory diagram showing that the front end of the paper tube is detected by one sensor and the rear end of the paper tube is cut.

FIG. 11 shows that the front end of the paper tube is detected by a plurality of sensors having different mounting positions, and the sensor is selected to cut the rear end of the paper tube to obtain a plurality of paper tubes having different lengths. FIG.

FIG. 12 is an explanatory view showing that a sensor for detecting the front end of the paper tube is attached so as to be movable in the front-rear direction, and a plurality of paper tubes having different lengths are obtained.

FIG. 13 is an explanatory view showing that a signal from a sensor for detecting the front end of a paper tube is input to a timer, and a plurality of paper tubes having different lengths are obtained by the timer.

[Explanation of symbols]

 1 Airframe 2 Headstock 3 Table 4 Turnbuckle 5 Arm 6 Pulley 7 Arm 8 Pulley 9 Extension table 10 Roller 11 Static shaft 12 Winding drive belt 13 Rotating spindle 14 Sliding rod 15 Coupled body 17 Winding static belt winding Rotating part 18 Bearing cylinder 19 Rotating cylinder 20 Spline shaft 21 Shelf 22 Guide 23 Ball screw shaft 24 Servo motor with encoder 26 Cutting core shaft 28 Cutter stand 30 Cutter 34 Cutter actuator 41 Photoelectric sensor

Claims (2)

[Claims] 1. A hollow static shaft horizontally supported by a cantilever at a rear end portion of a body and stretched between a pair of pulleys supported by the body, and wound once with a diagonal intersection with the static shaft. An endless wrapping drive belt that grows a paper tube while wrapping a paper tape obliquely around the outer circumference of the static shaft on the static axis, and a rotating spindle that can penetrate the static axis and slide in the front-rear direction. A core axis, which is extendedly connected to the front end of the rotary spindle protruding from the front end of the static shaft and grows on the static axis by fitting the paper tube outside thereof, and a body that is parallel to the rotary spindle; A sliding rod supported and slidable in the front-rear direction, a connecting body connecting the sliding rod and the rear ends of the rotary spindle, and a front end of the sliding rod supporting the core shaft from below. A cutter that is slidable in the front-rear direction with a cutter that comes into contact with and separates from the core axis. In a paper tube manufacturing apparatus including a table, a ball screw shaft parallel to the static axis and screw-engaged with the connecting body, and a servomotor with an encoder capable of rotating the screw shaft in the forward and reverse directions are provided as a machine body. Provided, the servomotor with an encoder rotationally drives the ball screw shaft in the forward and reverse directions to move the connected body forward and backward, and at the time of the forward movement, the cutting core shaft,
A paper tube manufacturing apparatus, characterized in that a cutter table is moved forward at the same speed as the axial growth speed of the paper tube, and the paper tube on the cutting core axis is cut by the cutter of the cutter table. 2. The paper tube manufacturing apparatus according to claim 1, wherein the connecting body is stopped and waited at a position in the middle of starting the forward movement from the last retracted position.