JP3069887B2 - Paper tube manufacturing equipment - Google Patents

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 obliquely supplied on a static shaft by an endless winding drive belt stretched between a pair of pulleys and wound obliquely once around a static shaft. The present invention relates to an apparatus for manufacturing a paper tube, in which a superposed portion of a paper tape is adhered while being screwed forward to form a paper tube and cut 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, while making the length of the cutting axis slightly longer than the cutting length of the paper tube, installing a cutter at the front end and the rear end of the cutter table, the rocking arm moves forward while the cutter table and the cutting axis advance. The angular velocity at the time of passing the top dead center from the rear to the front approximately matches the axial growth velocity of the paper tube that grows while screwing, and then the cutter at the front end on the cutter table and the rear The cutter at the end is operated simultaneously, 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]

The oblique winding around the static shaft,
When changing the width of the paper tape for screwing the overlapping portion into a paper tube by screwing it, it is necessary to change the oblique angle at which the winding drive belt intersects the static axis to a required angle.
Also, in the case of manufacturing a paper tube having a different diameter by changing a static shaft having a different diameter, it is necessary to change the oblique angle at which the winding drive belt intersects the static shaft to a required angle according to 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 apparatus, the cutter is operated when the swing arm passes from the top dead center to the front during the forward movement of the cutter table and the core axis to cut the growing paper tube. In addition, when the axial growth speed of the paper tube changes in various ways, it is difficult to match the angular speed at which the swing arm passes from the top dead center to the front in accordance with the various growth speeds in the axial direction of the paper tube. Requires skilled skills.

Furthermore, since the angular velocity at which the swing arm passes from the top dead center to the front is approximately matched to the axial growth speed of the paper tube, the cutting core axis at that time and the cutter table The forward speed does not exactly match the axial growth speed of the paper tube. Therefore, when the cutter of the cutter base cuts into the paper tube to cut the paper tube, the cutter slightly deforms the cut portion of the paper tube due to the speed difference, so that the cut portion of the paper tube becomes unsightly.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the problems of the above-mentioned prior proposals, and comprises a hollow static shaft having a rear end portion cantilevered and horizontally supported by an airframe. , Which is stretched between a pair of pulleys supported by the fuselage, is wound diagonally with the static axis, and is wound once. An endless wrapping drive belt for growth, a rotating spindle that penetrates the static shaft and is slidable in the front-rear direction, and is extendedly connected to the front end of the rotating spindle protruding from the front end of the static shaft to grow on the static shaft. A core axis, into which the inserted paper tube fits and grows, a sliding rod supported by the body in parallel with the rotating spindle and slidable in the front-rear direction, and a sliding rod and the rotating spindle. A connecting body for connecting the ends, and a cutting core connected to the front end of the sliding rod; And a cutter table that is slidable in the front-rear direction and has a cutter mounted on and separated from the core axis, and a ball screw shaft parallel to the static axis and screw-engaged with the coupling body. And a servomotor with an encoder capable of rotating the screw shaft in a forward / reverse direction, provided on the body, and the servomotor with the encoder drives the ball screw shaft in the forward / reverse direction to advance / retreat the coupled body. In the paper tube manufacturing apparatus, the core axis and the cutter table are advanced at the same speed as the axial growth speed of the paper core, and the paper core on the core axis is cut by the cutter of the cutter table. A connecting body that connects the rear end of the rotary spindle having the cutting axis connected to the front end and the rear end of the slide rod having the cutter table attached to the front end, and integrally moves the cutting axis and the cutter table. Start moving forward from the last retreat position Parked at a point halfway, then characterized by to wait until the forward.

[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 body 1 includes a base fixed on the floor, a headstock 2 erected on the rear end of the base, a fixed table 3 which is lower in height than the headstock and is installed in front thereof. 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 obliquely crossing below the static axis are pivotally connected in an X-shape at a fulcrum 0 which deviates from the perpendicular of the center line of the static axis. , A pair of pulleys 6, 6 ', and a pair of pulleys 8,
An endless winding drive in which the 8 'is rotatably erected, and the middle of the drive band is wound obliquely once around the outer circumference of the static shaft between the pair of pulleys 6 and 6' and between 8 and 8 '. Belts 12-I and 12
-II is installed. One of the pair of pulleys 6, 8 is driven to rotate by a motor M1, a speed reducer, and a pulley to which rotation is transmitted via a fulcrum 0, whereby the winding drive belts 12-I, 1 are driven.
2-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. Winding part 17-I and winding part 1
The winding directions of the 7-II with respect to the static axis are opposite to each other, and the winding drive belt 1 stretched between the pulleys 8 and 8 '
When, for example, two tapes each having the same width and coated with an adhesive are supplied to the rear winding portion 17-II of the 2-II so as to overlap one half of the width, the two tapes are connected to the winding portion 17-II. , The spiral is wound around the outer periphery of the static shaft, 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 Pulley 6, 6 '
While being wound around the static axis again by the front winding portion 17-I of the winding drive belt 12-I stretched therebetween, the winding drive belt 12-I advances and passes through the winding portion 17-I. It grows into a paper tube while rotating spirally toward the free end of the shaft.

The winding drive belts 12-I and 12-II are inclined obliquely to the static axis in accordance with the change of the tape width or the replacement of the static axis corresponding to the diameter in order to manufacture a paper tube having a different diameter. In order to adjust the winding angle of the winding, the table 3 holds the intermediate portion of the turnbuckle shaft 4 ′ in the front-rear direction, which can be turned by the handle 4, in a rotatable manner. Nuts 5 'and 7' are attached to the ends having pulleys 6 'and 8' to be movable in the longitudinal direction of the arm and swingable. The front of the turnbuckle shaft is the nut 5 'and the rear is the nut 7'. ´. Therefore,
By turning the turnbuckle shaft in the forward and reverse directions with the handle 4, the arms 5 and 7 are rotated at the fulcrum 0, and the winding portion 1 of the winding drive belt is wound.
The angle at which 7-I and 17-II wind around the static axis can be adjusted to be large or small. In addition, the idle pulley 6 of each arm
', 8' are erected on sliding bases slidable in the longitudinal direction of the arm, and these sliding bases are pressed toward the ends, and are required for the winding drive belts 12-I, 12-II. Tension can be applied.

A bearing cylinder 18 is provided on the rear wall of the headstock so as to face the detachable cylinder 16 on the front face.
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, and which is detachably connected to rotate integrally therewith.
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 front 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 slidably supported by penetrating the headstock in the front-rear direction immediately below the rotary spindle is connected to the 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 denotes a ball screw shaft which is parallel to the static shaft and penetrates the connecting body 15 in the front-rear direction and is screw-engaged. Reference numeral 24 denotes a servo motor with an encoder capable of rotating and rotating the ball screw shaft. The rear end of the ball screw shaft and the servomotor are supported by a rear support piece 25 erected at 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 and the spline shaft 20 and the sliding rod 14 move forward and backward integrally with the forward and backward movement of the connecting body. Connection 1
Even if 5 is at the most retracted position on the shelf, the rotary spindle 13
Is slightly projected forward from the front end of the static shaft 11.

At the front end of the rotary spindle is a short axis 26
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.

The front end of the sliding rod 14 is connected to a cutter table 28 supported on the front end of the table 3 by a guide 27 so as to be slidable in the front-rear direction. 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 a conventional paper tube manufacturing machine, when a paper tube having a length of 2 m is manufactured in the same manner as the core axis, the cutter table needs to have a length of 2.3 m in the front-rear direction. Then, it is sufficient that the length is about 150 mm regardless of the length of the paper tube to be manufactured.

[0017] As shown in FIGS.
In this embodiment, a holder 32 composed of two arms pivotally mounted and fixed in an X-shape, and two round blades which are rotatably attached to the lower ends of both arms of the holder and cut into 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. This reduces the diameter of the round blade, so in this case, the distance between the lower ends of both arms of the holder is reduced by turning the turnbuckle to narrow the distance between the upper ends of both arms of the holder. When the holder is lowered by a predetermined distance, the round blade circumscribes the core axis and cuts the paper tube (see FIG. 6B).

In this embodiment, the cutter operating device 34 is pivotally mounted at the upper end of a support 28 'standing on the cutter base 28 at an intermediate portion at a fulcrum 35', and one end is located above the pair of rollers 29, 29. The cylinder end is pivotally connected to the tip of a U-shaped swinging arm 35 whose other end protrudes horizontally from the side of the cutter table and a bracket 36 that protrudes outward from the side of the cutter table. An air cylinder 37 pivotally attached to the other end of the swing arm, a roller 38 axially attached to the other end of the swing arm, and a support column 39 erected at the front of the table 3 of the body in the longitudinal direction. A cam follower 40 is attached and comes into contact with the roller 38 from below, and is provided on an extension table 9 connected to the front end of the table 3 in a forward direction.
And a photoelectric sensor 41 for detecting the front end of the paper tube growing while screwing over the front end of the paper tube. On the extension table 9, there are provided a pair of longitudinally extending rollers 10, 10 which circumscribe from below and support the paper tube while circumscribing the growing paper tube while screwing over the front end of the core axis. The sensor 41 is installed beside the roller.

In order to mount the holder 32 of the cutter 30 to the swing arm 35, as shown in FIG. 7, a bearing cylinder 42 is provided at one end of the arm 35, a flange 44 is provided, and two arms of the holder are provided at the front end. Of the holder mounting shaft 43, which is fixed by tightening the X-shaped pivot portion with a nut 45, penetrates through the bearing cylinder portion 42 and holds it rotatably, and between the front of the bearing portion and the flange 44. Then, the coil spring 46 in a neutral state is fitted to the holder mounting shaft, and the front and rear ends of the spring are bent in the axial direction. The front bent portion 46a of the spring is inserted into the flange 44, and the rear bent portion 46b is inserted into the bearing tube portion 42. And the round 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 mounted on the swing arm via the neutral coil spring 46 in this manner, when the two round blades 31 are lowered to cut both sides of the paper tube from above, When the diameter of one round blade 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 first and is pushed up as shown in FIG. Accordingly, the holder rotates clockwise or counterclockwise against the coil spring 46, and the round blade having the smaller diameter also contacts the paper tube, and cuts the paper tube with 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 connector 15 is at the retracted position on the shelf 21, the roller 38 provided on one end of the swing arm 35 of the cutter operating device 34 comes into contact with the rear end of the cam follower 40 from below, and the air The cylinder 37 presses the roller 38 against the cam follower with an extension force.

The servo motor 24 rotates forward to rotationally drive the ball screw shaft 23, whereby the connecting body 15, the rotating spindle 13 and the cutting shaft 26, the sliding rod 14 and the cutter base 2 are rotated.
8 starts moving forward integrally, and when it advances by about half of the stroke amount, the roller 38 passes below the cam follower by passing under a front slope 40 ′ provided at the front end of the lower surface of the cam follower 40. As a result, the air cylinder 37 extends the piston, and swings the swing arm 35 clockwise in FIG. 6A around the fulcrum 35 ′.
The holder 32 to which the two round blades are attached is lowered, and the round blades 31, 31 contact the both sides of the paper tube from above on the portion supported from below by the support rollers 29, 29 of the core shaft 26, and the paper is rolled. Cut the tube. In this way, since both round blades contact the both sides of the paper tube from above and cut the paper tube, the cutting axis slightly deviates as compared with a case where the paper tube is cut from directly above with one round blade. The paper tube can be stably cut even when it turns, and the use life and replacement time of the round blades are extended because the two round blades cooperatively cut.

When the cutter table 28 reaches the forward end, the rotation of the servo motor 24 changes to reverse rotation, and at the same time, the supply and discharge of air to and from the air cylinder 37 change, and the piston shortens.
The swing arm 35 swings counterclockwise in FIG. 6A to raise the cutter, and the roller 38 is located below the lower surface of the cam follower. Thus, the cutter table 28 is retracted integrally with the connecting body 15.

As shown in FIGS. 4 and 5, the connecting body 15 always stops at a position advanced by a predetermined distance, for example, 10 mm from the retreat position, and waits until the next movement. 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, when the core shaft 26 and the cutter table 28 advance to cut the paper tube, the connected body retreats, stops at a predetermined distance, at the advanced position, and waits until the next advance.
The cutter table and the core shaft start cutting forward without backlash (allowable engagement gap) between the ball screw shaft 23 and the nut incorporated in the coupling body that is threadedly engaged with the ball screw shaft. Variations in the length of the tube can be eliminated.

The connecting body 15, the core shaft 26 and the cutter table 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 rotation speed (RPM) of the servo motor for rotating and driving the ball screw shaft. Is determined. In this case, since the pitch of the screw is constant, the forward speed of the connected body, the core axis 26 and the cutter table is controlled by controlling the rotation speed of the servomotor to make the paper tube on the static axis and the core axis move. It can be easily matched to different axial growth rates.

Therefore, the rotating spindle 13 and the core shaft 26
And the winding drive belt 12 circulates and grows as a paper tube toward the free end of the static shaft while spirally winding a paper tape on the static shaft 11, and the front end of the paper tube becomes static. After reaching the core shaft 26 beyond the free end of the shaft, and further on the pair of rollers 10, 10 of the extension table 9, when detected by the photoelectric sensor 41, the photoelectric sensor
Command the operation. This causes the servo motor to rotate forward,
By rotating and driving the ball screw shaft 23, the connecting body 15 is advanced at the same speed as the axial growth speed of the paper tube, and the rotary spindle and the core axis connected to the connecting body by the spline shaft 20 advance integrally while rotating. Then, 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, as shown in FIG. 10, when the connected body and the cutter table advance 120 mm from the stop position and the cutter cuts the paper tube, as shown in FIG. The photoelectric sensor 41 may be installed on an extension table 2 m in front of the camera.

Therefore, as shown in FIG. 11, a plurality of photoelectric sensors 41 are provided near the rollers 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.

As shown in FIG. 12, a guide 48 in the front-rear direction is provided beside the rollers 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, beside the rollers 10 and 10 on a 1.5-meter extension table. An adjustable timer 49 is connected between the timer 24 and, for example, if the time required for the paper tube to grow by 50 cm is 3 seconds, the timer is set to 0 second, and the photoelectric sensor instructs the servomotor at 0 second. A 1.5 m paper tube is manufactured, the timer is set to 3 seconds, and after the photoelectric sensor issues a command, the timer transmits the command to the servo motor with a delay of 3 seconds, and a 2.0 m long paper tube is issued. Or a timer set to 6 seconds, and the command of the photoelectric sensor is transmitted to the servomotor with a delay of 6 seconds to produce a 2.5 m long paper tube.

In the embodiment of FIG. 6A, the cutter actuator 3
4 is a swing arm 35 having a cutter attached to one end,
It is composed of a roller 38 at the other end, a cam follower 40 with which the roller slides, and an air cylinder 37. However, the present invention is not limited to this. For example, the swing arm is urged to a non-cutting position by a spring, and an electromagnet is used. It may be operated at the cutting position.

The rollers 10, 1 of the extension table 9 are provided on one side of the rollers 10, 10 at predetermined intervals 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 embodiment shown in FIG. 1, two winding drive belts are used, and two arms having pulleys for extending the both belts attached to respective ends are pivotally connected in an X-shape at a fulcrum 0, but not necessarily. There is no need for this, and the first of the aforementioned 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 support is erected on the intermediate portion of the base between the cutter base and the headstock, behind the static shaft, and the support is erected. An arm having a winding drive belt stretched around a horizontal fulcrum in a direction perpendicular to the static axis may be pivotally mounted on the front surface of the arm.

Further, in this embodiment, the length of the cutting axis and the length of the cutter table are shortened, and the rear end of the growing paper tube is cut by one cutter on the cutter table.
Using a core axis and cutter base slightly longer than the length of the paper tube obtained by cutting, simultaneously operate both the front cutter installed on the front end of the cutter base and the rear cutter installed on the rear end of the cutter base. Alternatively, the cutting may be performed.

As is apparent from the above description, the ball screw shaft, which is rotationally driven by the servomotor with the encoder which can be rotated forward and backward, penetrates the connecting body for integrally moving the cutting axis and the cutter base and screw-engages. The servomotor rotates the ball screw shaft forward and backward to move the connected body, the core axis, and the cutter base forward and backward.By adjusting the rotation speed of the servomotor, the connected body, the core axis, and the cutter base are adjusted. Forward speed, static axis,
The growth speed in the axial direction of the paper tube growing while screwing on the core axis can be easily matched. 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.

[0037]

According to the present invention, the connecting member connecting the rear end of the rotary spindle and the rear end of the sliding rod is moved from the last retreat position to the middle position until the next advance. Stop and wait, so next time you cut the paper tube,
A paper tube cut to start advancing the cutter table and the core shaft without backlash (allowable mesh gap) between the ball screw shaft and the nut incorporated in the coupling body that is screwed with the ball screw shaft. Can be eliminated.

[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. 3;

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

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

7A and 7B are a side view of FIG. 6A viewed from the right and an enlarged sectional view of a part thereof.

FIG. 8 is a plan view of FIG. 7;

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]

 DESCRIPTION OF SYMBOLS 1 Airframe 2 Headstock 3 Table 4 Turnbuckle shaft 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 Connecting body 17 Static shaft of winding drive belt Winding part 18 Bearing cylinder 19 Rotating cylinder 20 Spline shaft 21 Shelf 22 Guide 23 Ball screw shaft 24 Servo motor with encoder 26 Core shaft 28 Cutter base 30 Cutter 34 Cutter actuator 41 Photoelectric sensor

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B31C 1/00-13/00

Claims (1)

(57) [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 end of the rotating spindle, and a connecting rod connected to the front end of the sliding rod, and A cutter that supports and slides in the front-rear direction with a cutter that comes in contact with and separates from the core axis. A ball screw shaft which is parallel to the static shaft and is screw-engaged with the connecting body; and a servomotor with a forward / reversely rotatable encoder for driving the screw shaft is provided on the body. The ball screw shaft is driven forward and reverse by a servo motor with an encoder to advance the connected body,
When retracted, the core axis and the cutter table are moved forward at the same speed as the axial growth speed of the paper tube when moving forward, and the paper tube on the core axis is cut by the cutter of the cutter table. The paper tube manufacturing apparatus according to claim 1, wherein the connecting body is stopped at a position where the forward movement is started from the last retreat position, and is stopped until the next advance.