JPH06182695A - Paper tube cutting device - Google Patents

Abstract

PURPOSE:To cut a paper tube to the required length and surely fixed the paper tube to the shaft outer periphery without wasting a grip margin. CONSTITUTION:A paper tube 1 is inserted to the outer periphery of a shaft 3, and the shaft 3 is rotatively driven and pressed to a rotary edge 6 to cut the paper tube 1 to the required length. A paper tube cutting device is provided with a coupling body 8 partially protruded from the outer periphery of the shaft 3 when the paper tube 1 is fixed on the outer periphery of the shaft 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tube cutting device which inserts a paper tube into the outer circumference of a shaft and, when the shaft is rotationally driven, presses a rotary blade against the paper tube to cut the paper tube into a required length. .

[0002]

2. Description of the Related Art Conventionally, as a paper tube cutting device of the above type, there is a paper tube cutting device provided with a claw at the base of the shaft for grasping the outer circumference of the paper tube in order to fix the paper tube to the shaft during cutting.

[0003]

However, in the above-described paper tube cutting device, since the paper tube is easily scratched, a trace of being caught by the nail remains on the outer periphery of the paper tube, and that portion cannot be made into a product. There is much waste of paper core. Further, since the shaft has a claw at the base, it is necessary to insert the paper tube to the base of the shaft, which is inconvenient for mounting and removing the paper tube.

An object of the present invention is to insert a paper tube into the outer periphery of a shaft, rotate the shaft, and press a rotary blade to cut the paper tube into a required length, thereby cutting the paper tube into a required length. It is to securely fix the paper tube to the outer circumference of the shaft without wasting.

[0005]

In order to achieve the above-mentioned object, the present invention is characterized by comprising an engaging body part of which protrudes from the outer circumference of the shaft when fixing the paper tube to the outer circumference of the shaft.

[0006]

A part of the engaging body protruding from the outer circumference of the shaft is pressed against the inner circumference of the paper tube inserted into the outer circumference of the shaft, whereby the paper tube is fixed to the shaft.

[0007]

1 to 3 show a first embodiment of the present invention. In FIG. 1, a paper tube 1 is inserted into an outer periphery of a shaft 3 which is supported by a machine frame 2 so as to be rotatable and in a cantilever state, until it is hit by a stopper 4 and fixed to the shaft 3.
The shaft 3 is rotationally driven by and the rotary blade 6 rotatable about an axis parallel to the shaft is pressed to cut the shaft 3 into a required length.

In this embodiment, since the cutting position by the rotary blade 6 is fixed to the shaft 3, the cutting length of the paper tube 1 is changed by adjusting the insertion length of the paper tube 1 into the shaft 3. For that purpose, the stopper 4 can be moved along the longitudinal direction of the shaft 3 and fixed at a required position. In addition,
When the stopper 4 prevents insertion of the paper tube 1 over a required length, the tip of the paper tube 1 may directly contact the stopper 4 or indirectly via a known attachment. Good.

The rotary blade 6 is provided near the tip of the shaft 3 in order to minimize the insertion amount of the paper tube 1, and prevents the shaft 3 from being bent when the rotary blade 6 is pressed against the outer circumference of the paper tube 2. In order to do so, a pair of support rollers 7 for supporting the outer circumference of the paper tube 1 inserted in the shaft 3 are provided at positions corresponding to the rotary blade 6. The rotary blade 6 and the support roller 7 can be moved away from the shaft 3 to a retracted position by a known means so as not to interfere with the attachment and detachment of the paper tube 2.

The paper tube 1 is fixed to the shaft 3 by causing a part of the engaging body 8 provided on the shaft 3 to project from the outer periphery of the shaft 3. In this embodiment, a drive mechanism 9 for projecting the engaging body 8 is provided in the hollow portion of the shaft 3, and the drive mechanism 9 includes the shaft 3
A pressure fluid such as compressed air can be supplied in a timely manner through one end of the rotary pipe joint 10. As shown in FIG. 2, the drive mechanism 9 is provided with a tube 11 made of, for example, rubber, which can expand and contract, and has holders 12a, 1a.
Both ends are held by 2b so that pressure fluid does not leak.

The engaging body 8 is movably inserted in the radial direction of the shaft 36 into an opening 13 communicating from the hollow portion of the shaft 3 to the outer periphery thereof, and has a base portion 8a at the lower end protruding into the hollow portion. A leaf spring 14 is provided between the base portion 8 a and the shaft 3 as a means for urging the engagement body 8 toward the inside of the shaft 3. This leaf spring 14 has one end at the base 8 so as not to fall off.
It is fixed to the upper surface of a.

As shown in FIG. 3, in this embodiment, three engaging members 8 are arranged at intervals in the circumferential direction of the shaft 3, and a head 8b is formed at the upper end of each of them. . Then, when the paper tube 1 is inserted into the outer periphery of the shaft 3, the head portion 8b moves to the shaft 3
The upper end surface of the head portion 8b is formed into a cylindrical surface having substantially the same radius as the outer circumference of the shaft 3 so as not to get out of the outer circumference of the shaft and get in the way. The head 8b can be submerged in 3a. Since the contact area between the head portion 8b and the inner circumference of the paper tube 1 is large, the inner circumference of the paper tube 1 is not easily scratched. The base 8a is made of a cylindrical piece larger than the opening 13 arranged along the outer circumference of the tube 11,
It is fixed to the engaging body 8 with a bolt 8c.

When the pressure fluid is supplied to the drive mechanism 9, the paper tube 1 inserted into the outer periphery of the shaft 3 hits the stopper 4, and the paper tube 1
After you have reached the required position, do it. Then, the tube 11 expands and pushes up the base portion 8a, whereby the head portion 8b of the engagement body 8 projects from the outer periphery of the shaft 3. This head 8
When the paper tube 1 is not inserted, b can project to the position shown by the chain double-dashed line in FIG.

When the head portion 8b of the engaging body 8 projects from the outer circumference of the shaft 3, it comes into frictional engagement with the inner circumference of the paper tube 1 inserted into the outer circumference of the shaft 3 to fix the paper tube 1 to the shaft 3. In addition, in order to increase the restraining force of the paper tube 1, the head 8b may be provided with, for example, a large number of protrusions, or the head 8b may be made of a material having a high friction coefficient.

The pushing up of the engaging body 8 must be continued until the cutting of the paper tube 1 is completed. Generally, the pressure fluid is supplied to the drive mechanism 8 through the switching valve so that the pressure fluid does not escape from the drive mechanism 9 until the cutting of the paper tube 1 is completed.
In that case, it is not necessary to continue sending the pressure fluid from outside the shaft 2 until the paper tube 1 is unfixed.

When the cutting of the paper tube 1 is completed, the pressure fluid is released from the drive mechanism 9. Then, the tube 11 contracts, the engaging body 8 is pushed down toward the hollow portion by the leaf spring 14, and the head portion 8b retracts into the recessed portion 8c of the shaft 3. As a result, the fixation of the paper tube 1 is released.

When the paper tube 1 is fixed to the shaft 3, the shaft 3
A sensor such as a limit switch detects that the paper tube inserted into the outer circumference of the stopper 4 hits the stopper 4, and the switching valve is operated based on the detection signal to automatically supply the pressure fluid to the drive mechanism 9 to rotate the rotary blade 6 Detects that the paper tube 1 has cut and reached the shaft 3 by electrical conduction between the shaft 3 and the rotary blade 6, or by a position detection sensor such as a photoelectric switch, and based on the detection signal, a switching valve is activated. It is preferable that the supply of the pressure fluid is automatically stopped by the operation.

In the second embodiment shown in FIG. 4, the rotary blade 6
Can be moved in the longitudinal direction of the shaft 3 to change the cutting position. Since the length of the paper tube 1 before cutting is shorter than that of the shaft 3, the tip of the shaft 3 projects from the paper tube 1. Therefore, when cutting the shaft 3
The tip of the shaft 3 is supported by the center 15 to prevent the bending of the shaft 3. The center 15 is attached to a support arm 16 so that when the paper tube 1 is attached or detached, it can be retracted from the tip of the shaft 3 by swinging or sliding movement of the support arm 16.

Although the two embodiments of the present invention have been described with reference to the drawings, the embodiments can be variously changed without changing the gist of the invention.

For example, a plurality of shafts for inserting and supporting the paper tube in the outer periphery are attached to the turret, and the shafts are rotated by the rotation of the turrets to form the stopper 4 and the rotary blade 6 in the embodiment of FIG.
And a support roller and a primary cutting position and a secondary cutting position having the rotary blade 6 and the center 15 of the embodiment of FIG. Insert into the shaft, cut into a length corresponding to a plurality of paper tubes of the required length to be cut at the secondary cutting position, remove the remaining cut paper tubes and rotate the turret to rotate the shaft. Replace and insert the next paper tube at the primary cutting position, and cut the paper tube cut at the primary cutting position at the secondary cutting position into multiple paper tubes of the required length and pull it out from the shaft. Good. This enables efficient cutting with less waste of the paper tube.

Further, instead of the drive mechanism 9 shown in FIG.
A pushing-up means having a piston operated by a pressure fluid, a pushing-up means having a cam that moves forward or backward in the longitudinal direction of the shaft may be used. Further, the engaging body may be an elastic body such as rubber, which is compressed and deformed so as to protrude from the outer circumference of the shaft. Further, a tube that expands and contracts by the pressure fluid around the shaft may be arranged as an engaging body. Further, instead of the rotary pipe joint 10 shown in FIG. 1, a valve is directly provided on the shaft, the supply source of the pressure fluid is temporarily connected to the valve immediately before the start of fixing the paper tube, and the pressure fluid is supplied through the valve. The paper tube may be fixed by supplying it to the shaft. Further, the driving force outside the shaft may be supplied by a known mechanical means to cause the engaging body to project.

[0022]

Since the present invention is constructed as described above, it has the following effects.

When the paper tube is fixed to the outer circumference of the shaft, the paper tube is fixed by a part of the engaging member projecting from the outer circumference of the shaft. The paper tube can be fixed to. Therefore, the outer circumference of the paper tube is not scratched and the gripping margin is not wasted. And
The cutting accuracy is good because it does not shift in the longitudinal direction of the shaft during cutting. Further, since no slip occurs in the rotation direction, a clean cut can be surely obtained. Also, the paper core can be smoothly attached and detached. Moreover, since the disposition position of the engagement body is not limited to the root of the shaft as in the conventional case, it becomes possible to provide a paper tube cutting device capable of efficiently attaching and detaching the paper tube.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a paper tube cutting device according to a first embodiment.

FIG. 2 is a longitudinal cross-sectional view showing an engagement body equipped portion of the shaft according to the first embodiment.

FIG. 3 is a cross-sectional view in a right angle direction showing an engagement body equipped portion of the shaft according to the first embodiment.

FIG. 4 is an explanatory diagram of a paper tube cutting device according to a second embodiment.

[Explanation of symbols]

 1 Paper Tube 3 Shaft 4 Stopper 6 Rotating Blade 7 Support Roller 8 Engagement Body 9 Drive Mechanism 11 Tube 13 Opening Portion 14 Spring 15 Center

Claims (1)

[Claims] 1. A paper tube cutting device which inserts a paper tube into the outer periphery of a shaft, cuts the paper tube into a required length by rotating the shaft and pressing a rotary blade, A paper tube cutting device comprising an engaging body, a part of which protrudes from the outer circumference of the shaft when fixed to the outer circumference.