JP2000288980A - Method and device for cutting paper pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the noise or powder dust in cutting and also the burring by pressing a contact member by a paper pipe advanced prior to the cutting by a cutting blade body, thereby starting the cutting by the blade body while advancing the blade body together with the paper pipe at the same speed. SOLUTION: When an advancing manufactured paper pipe makes contact with a contact member 36, the contact member 36 is rotated together with the paper pipe 60, and a movable base 12 is pressed by the paper pipe 60 to start advancing. When a detecting member consisting of a limit switch detects this advance, the clutch of an electric motor 21 is connected by this detection signal to rotate a hollow shaft 17, and each eccentric weight 33 is rotated, whereby each blade body 32 starts the cutting of the paper pipe 60. The cutting end time can be preliminarily set. The drive of the electric motor 21 is stopped according to the time-up signal to open the blade body 32, the contact member 36 is also rotated, and the cut part of the paper pipe 60 is pushed and fallen by the advancing paper pipe 60.

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 cutting a paper tube manufactured by a paper tube manufacturing apparatus.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional paper tube manufacturing machine which is also applied to the present invention. In this figure, reference numeral 50 denotes a core shaft fixedly arranged at a predetermined position. 5
2 is paper to be wound around this core shaft first, 53 is this paper 52
, For example, two sheets of paper to be wound, 54 is each paper 53
This is a gluing roller that allows quick-drying chemical glue to adhere to the surface. Reference numeral 55 denotes one side driven by a motor (not shown).
A paper tube 60 in which the papers 52 and 53 wound around the core shaft 50 are wound once from the outside with a fastening belt mounted on a pair of pulleys 56 so as to obtain a tightly joined paper tube 60 and in the direction of the arrow. It is designed to move forward while rotating. The paper tube 60 thus manufactured needs to be cut while being advanced.

FIGS. 6 and 7 schematically show a conventional and generally used rough cutting machine for cutting a paper tube 60 manufactured as described above. This rough cutting machine uses a blade 62 made of a circular saw for sawing. The rough cutting machine is driven by a motor (not shown) and moved toward the paper tube 60 by an air cylinder at a position deviated forward from the core shaft 50. It is designed to be cut. In this case, as soon as the blade body 62 starts cutting, it is pushed by the cut surface of the paper tube, and the blade body moves forward. When the cutting is completed, the blade body 62 separates from the paper tube and is returned to the initial position by the return spring 65. This cutting time takes a considerable time, for example, 5 seconds. Further, the blade body has a drawback that a loud noise is generated due to the coarseness of the circular saw and a large amount of dust is generated, which impairs a worker's health. Further, as shown in FIG. 8, the rough cut product 67 does not have a flat cut surface, and burrs 70 are formed on the inside and the outside, and both ends need to be finished and cut again. Had a large amount of dust 72 attached thereto.
Further, as shown schematically in FIG. 9, the finishing cutter inserts a roughly cut product 67 outside the core shaft 75, and makes two circular blades 77 approach and cut while rotating the core shaft. .
When this rough cut product is fitted, the dust 72 resists and cannot be fitted easily. Further, in the case of finish cutting, a product of a plurality of paper tubes having a predetermined size may be obtained by using about 3 to 4 blade bodies 77. Some conventional paper tube cutters use a single circular blade to cut, but the structure and equipment are complicated and costly. In order to start the movement, the blade is cut in a state where the blade is almost stationary with respect to the moving direction of the paper tube, so that some burrs are formed and it is difficult to finish accurate dimensions. Therefore, finish cutting was required.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a simple and inexpensive apparatus can be used for cutting with almost no noise and dust at the time of cutting, and furthermore, there is no burr, the cut surface is flattened, and finish cutting is not required. The present invention provides a method and an apparatus for cutting a paper tube which can be cut in an extremely short time so that a complete product can be selected.

[0005]

SUMMARY OF THE INVENTION The present invention is a paper tube cutting method for cutting a paper tube advancing while rotating around a fixed core axis, wherein the cutting blade body is advanced before cutting. A cutting method is provided in which the cutting member is started while the blade body advances at the same speed together with the paper tube when the contact member is pushed by the paper tube. The present invention is also a paper tube cutting device that cuts a paper tube that advances while rotating around a fixed core axis, and is capable of moving forward and backward with respect to a base, and is returned by a return device when it advances. A cutting blade rotatable by an electric motor mounted on the movable table, and the movable table includes an abutment device capable of setting a position in the front-rear direction so as to be adjustable; It has an abutting member that abuts the leading end portion and rotates together, and the movable table on which the blade body is mounted is advanced at the same speed together with the paper tube by pushing the abutting member by the advancing paper tube. An object of the present invention is to provide a paper tube cutting device, characterized in that the cutting by the blade body is started.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the embodiment of the present invention shown in the drawing, reference numeral 10 denotes a base, and 12 denotes a movable base which can be advanced and retracted in the traveling direction of the paper tube 60 by wheels 14 along a rail 13 provided on the base. The air cylinder 15 is always held at the retracted position. Reference numeral 17 denotes a cylindrical body penetrated through a paper tube 60 advancing to the outside of the core shaft 50, and is rotatably supported by a pair of bearings 19 provided on the movable base 12. Reference numeral 21 denotes an electric motor with a clutch provided on the movable base 12, which is rotated in a predetermined direction by a timing pulleys 23, 24 and a timing belt 25 when a predetermined signal described later is received.

Reference numeral 26 denotes a mounting member which is mounted on the outside of the front end of the hollow shaft 17 or has an integral structure. Three mounting shafts 27 are rotatably penetrated therethrough. One end of an arm 30 is fixed to the front end of each mounting shaft 27. A circular blade 32 is rotatably mounted on the other end of each arm.
Reference numeral 33 denotes an eccentric weight having one end fixed to the rear end of each mounting shaft 23 and is constantly pulled inward by a spring 34. Therefore, the blade body 32 is separated from the paper tube 60 that advances.

Reference numeral 35 denotes an abutting device for abutting the leading end of the paper tube 60. The abutting device 35 has an abutting member 36 having an abutting surface formed to be slightly conical, for example, about 15 degrees.
Reference numeral 37 denotes a shaft of the contact member, which is supported by a bearing 38 and rotates with the paper tube when the tip of the paper tube is pressed. Reference numeral 39 denotes a rod member attached to the front end of the movable base 12 and extends forward. Reference numeral 40 denotes a column movable along the rod member and fixed by screws 41. A bearing 38 for supporting the shaft 37 of the contact member 36 is attached to a lever 42 which extends downward from the upper end of the column 40 so as to be rotatable by an air cylinder (not shown). The lever 42 can be rotated by an air cylinder (not shown) as shown by a dashed line as described later. Reference numeral 46 denotes a centering device provided on the base 10 for centering the paper tube 60 to be sent. The centering device 46 is configured to approach two rolls 47 from both sides to perform centering.

In the construction described above, when the manufactured and advancing paper tube 60 abuts against the abutting member 36, the abutting member 36 rotates together with the paper tube 60 and is pushed by the paper tube to move the movable base. 12 starts moving forward. A signal detected by a detection member comprising a limit switch (not shown) detects the forward movement of the electric motor 21, the hollow shaft 17 rotates, and the respective eccentric weights 33 rotate. Start cutting. Each blade body 32 has a core shaft 6 per second.
The cutting is completed in one second because it is rotated about 0 around 20 times, for example. The time at which the cutting is completed can be set in advance, and when the time comes, the driving of the electric motor 21 is stopped, the blade body 32 is opened, and the contact member 36 is rotated as shown by the dashed line, and the paper is cut. The cut portion of the tube 60 is pushed by the advancing paper tube 60 and falls. In addition, the movable base 12 is also stopped, and at the same time, the air cylinder 1 serving as a return device.
5 starts retreat and returns. Also, the contact member 36
Also returns to the initial state. Thereafter, the same operation can be repeated to cut. When cut in this manner, the cut surface becomes flat, no burrs are generated, and no dust is generated. Therefore, there is no need to perform finish cutting, and the product can be obtained as it is. In the present invention, since the cutting is started after the movable table 12 starts to move, the cutting is started in consideration of the length of advance of the paper tube 60 during that time, so that a product with extremely accurate dimensions can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the eccentric weight 33 is attached to the mounting body 2.
6 may be provided on the same side as the blade body 32. The spring 34 may be connected to the arm 30 in some cases.

[0011]

Since the present invention is constructed as described above, no noise or dust is generated at the time of cutting, and no burrs are generated at the same time. This has the effect that a finished product is obtained and there is no need for finish cutting. Further, the contact surface of the contact member having a slightly conical concave surface has an advantage that the end portion thereof is not damaged when the paper tube contacts.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention partially cut away, sectioned or removed.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a side view showing the centering device.

FIG. 5 is a perspective view showing a conventional method of manufacturing a paper tube.

FIG. 6 is a front view schematically illustrating a main part of a conventional rough cutting machine for cutting a paper tube at the time of manufacturing the same.

FIG. 7 is a side view showing a part thereof as a cross section.

FIG. 8 is a longitudinal sectional view showing a part of a paper tube cut at the time of manufacturing a conventional paper tube.

FIG. 9 is an explanatory view schematically showing a conventional finish cutting machine.

[Explanation of symbols]

 Reference Signs List 10 base 12 movable base 15 air cylinder 17 hollow shaft 26 mounting body 27 mounting shaft 30 arm 32 blade 33 eccentric weight 36 contact member 50 core shaft 60 paper tube

Claims (4)

[Claims] 1. A paper tube cutting method for cutting a paper tube advancing while rotating about a fixed core axis, wherein the abutting member is formed by a paper tube advancing before the cutting blade body is cut. , The cutting is started while the blade body advances at the same speed together with the paper tube at the same speed. 2. A paper tube cutting device for cutting a paper tube that advances while rotating around a fixed core axis, wherein the paper tube cutting device is capable of moving forward and backward with respect to a base, and is returned by a return device when moving forward. A cutting blade rotatable by an electric motor mounted on the movable table, and the movable table includes an abutment device capable of setting a position in the front-rear direction so as to be adjustable. The movable table on which the blade is mounted advances at the same speed together with the paper tube when the abutting member is pressed by the paper tube that has been advanced. A paper tube cutting device, wherein the cutting by the blade body is started while the cutting is performed. 3. A paper tube cutting device for cutting a paper tube that advances while rotating around a fixed core axis, wherein the paper tube cutting device is capable of moving forward and backward with respect to a base, and automatically moves when it advances. A movable table supported by a return device and a front end of a cylindrical body supported by the movable table via a bearing and rotatable by an electric motor that penetrates the core shaft through an advancing paper tube. An attachment body integrated or attached to the
An eccentric weight fixed at one end to each of a plurality of shafts rotatably supported by the mounting body and each of which is always held at a predetermined position by a spring, and a lever fixed at one end to the shaft of the eccentric weight. A circular blade body that is rotatably mounted on the other end and is disposed at a position where the core axis is present on the inside, and is further fixed so as to be adjustable in the front-rear direction with respect to the movable base. The contact device includes a contact member that advances the movable table at the same speed as the paper tube while rotating together while being pushed by the paper tube when the leading end of the paper tube comes into contact. The rotation of the electric motor is transmitted to the cylindrical body by a signal detected that the movable base has moved forward, and each eccentric weight is rotated by centrifugal force to rotate each blade body inward. A paper tube cutting device for cutting a paper tube. 4. The paper tube cutting device according to claim 3, wherein the contact member has a slightly conical concave surface on the surface with which the paper tube contacts.