JPH0537982Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a device for wrapping rectangular paper tubes, more specifically, a mandrel part that allows smooth removal of a rectangular paper tube whose outer periphery is seamed. Regarding structure.

[Conventional technology]

Conventionally, in order to manufacture rectangular paper tubes used for the bodies of containers, etc., a cylindrical flat-wound paper tube is manufactured using a circular mandrel, and then this paper tube is soaked with moisture to make it soft, and then the square shaft is made. A square paper tube was obtained by inserting a paper tube into a shaped mold, shaping it, and removing it from the mold after drying.

[The problem that the idea aims to solve]

By the way, the conventional method of producing a cylindrical paper tube and then forming it into a square paper tube requires many processing steps.
This increases the cost of the product, and since the circular paper tube is deformed, the finished appearance and strength deteriorate, resulting in a lower commercial value.

Therefore, in order to solve the above-mentioned problems, the problem of this invention is to efficiently produce a rectangular paper tube with excellent appearance and strength at a low cost by directly seaming the rectangular paper tube. The purpose of the present invention is to provide a device for tightening rectangular paper tubes.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention forms the mandrel body around which the paper tube is wound and formed in the shape of a rectangular column, and the mandrel body is mounted on a support stand so that it can move freely in the axial direction in a horizontal state. A motor for rotating the mandrel body is provided on the support base, and the outer surface of the mandrel body is the outer circumferential surface of the mandrel body. The movable member is fitted, and one end of the movable member located on the support stand side is pivoted to the mandrel body using a pivot fitting so that it can swing freely in the radial direction about the pivot fitting, and the mandrel body A spring is provided between the free end of the movable member and the other end of the movable member, which biases the movable member with rotational elasticity in a direction in which the outer surface of the movable member retracts from the outer peripheral surface of the mandrel body, and the mandrel body is moved to the forward position. A rotary shaft protruding from the center of the distal end surface is fitted and held in a position facing the free end surface of the movable member, and a cam having an inclined surface on the outer peripheral surface is fixedly disposed, and When the mandrel body is in the forward position, it rests on the inclined surface of the cam and pushes up the movable member,
A trochanter is installed to align the outer surface of the movable member with the outer circumferential surface of the mandrel body, and the tip is close to the outer circumferential surface of the mandrel body at the position of the support base side end of the mandrel body in the forward position, and the trochanter is placed in position to align the outer surface of the movable member with the outer circumference surface of the mandrel body. The mandrel adopts a configuration in which a pull-out plate is arranged to receive the end of the square paper tube to prevent it from moving during the mandrel body, and to pull out the square paper tube from the mandrel body.

[Effect]

The movable member is pushed outward, and a rectangular paper tube is wound and formed around the outer peripheral surface of the mandrel while holding its outer surface so as to become a part of the outer peripheral surface of the rectangular mandrel body.

When pulling out the square paper tube, the movable member is immersed into the incision and a portion of the outer circumferential surface of the mandrel is reduced in diameter, thereby weakening the tension on the inner circumferential surface of the square paper tube against the mandrel, and the square paper tube is pulled out in the axial direction. When the mandrel main body is retracted, the ends of the rectangular paper tube come into contact with the pull-out plate to prevent movement, and the mandrel main body is pulled out from the rectangular paper tube.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

Figure 1 shows the overall structure of a rectangular paper tube manufacturing device. Between a pedestal 1 that supports base paper A and a seaming device 2 placed in front of it, the extracted base paper A is fed to the seaming device 2. and guiding, xantharola,
Roller group 3 including rear feeding roller, front feeding roller, etc.
and a gluing mechanism 4 that applies adhesive to one side of the base paper.
A shower mechanism 5 that moistens the base paper and a cutter mechanism 6 that cuts the base paper into a predetermined length are arranged side by side. It is designed to automatically form a paper tube.

The mandrel 7 of the seaming device 2 includes a mandrel main body 8 having a rectangular columnar shape with rounded corners, and a cutout 9 formed along the width direction with a predetermined width on one surface of the peripheral wall of the main body 8. Movable member 10 incorporated into
The mandrel body 8 is fixed to a horizontal rotating shaft 11 in a coaxial arrangement.

As shown in FIG. 2, etc., the rotating shaft 11 is rotatably supported by a support base 15 that moves along a rail 13 laid on the floor by the expansion and contraction of a cylinder 14, and is rotated by a motor 16. When the mandrel 7 is in the forward position at the paper tube forming position, the tip of the rotating shaft 11 is fitted and supported by a bearing 17 provided on the floor, so that it rotates without wobbling. .

The mandrel main body 8 is provided with a wide cutout 9 extending over the entire length in the axial direction on one surface of the rectangular cylindrical peripheral wall, and the movable member 10 has a width and length that just fits into the cutout 9. The outer surface thereof is formed to become a part of the peripheral wall of the mandrel body 8, and is fitted so as to be movable in the radial direction within the cutout 9.

The movable member 10 is attached to the end wall 8a of the mandrel main body 8 by a hinge-shaped pivot fitting 18 at one end on the side of the support base 15, and a cutout 9 is formed in the center of the pivot fitting 18 in the radial direction. It can swing freely.

As shown in FIG. 4, the other end of the movable member 10 is given elasticity in the direction of sinking into the cutout 9 by the tension of the spring 19, and a trochanter 20 is attached to this end, as will be described later. It forms the cam and operating mechanism.

When the mandrel 7 is in the advanced paper tube forming position as shown in FIG. 2, the trochanter 20 rests on the inclined surface 22a of the cam 22 provided on the rotating shaft 21 of the bearing 17, and the movable member 10 is pushed up. The outer surface becomes one of the outer peripheral surfaces of the mandrel body 8, and the entire outer peripheral surface of the mandrel 7 has a rectangular cross-sectional shape.

Further, when the mandrel 7 retracts together with the support base 15, the trochanter 20 is released from the cam 22 and falls into the incision 9, and as shown in FIG.
is inclined, and some of the four peripheral surfaces of the mandrel 7 become small in diameter, weakening the tightening force of the rectangular paper tube B wound around the outer periphery of the mandrel 7 to the mandrel 7, and preventing the rectangular paper tube B from being pulled out in the axial direction of the mandrel. enable.

A large number of suction holes 23 are arranged in the axial direction on the peripheral wall of the mandrel body 8 on the side opposite to the movable member 10, and each suction hole 23 is connected to the suction box 2.
4 and piping 25, a passage 26 of the rotating shaft 11, and a rotating joint 27, the suction device 28 provided on the support base 15 is connected to The base paper is held firmly in place by the suction force of the base paper, and winding of the base paper can be started automatically.

In the case of the suction device 28 shown in FIG. 9, a pump 29 connected to the suction hole 23 is driven by a motor 30 to generate suction force.

When the mandrel 7 is in the advanced paper tube forming position, the drawing plates 32, 32 whose tips are close to the outer periphery of the mandrel 7 are placed at positions on both sides corresponding to the end on the support stand 15 side, as shown in FIG. is arranged by standing up on the floor, and when the mandrel 7 retreats after forming the square paper tube, the ends of the square paper tube B come into contact with the pull-out plates 32, 32, and are prevented from moving. Paper tube B is designed to fall out automatically.

Directly above the mandrel 7, a press roller 33 that can freely swing up and down and a heater 34 that can move up and down are provided so that the heater 34 welds and fixes the winding end of the rectangular paper tube B. It's getting old.

Directly below the mandrel 7, a push-up roller 35 that moves up and down with a cylinder is arranged to press the base paper A so that slips do not occur during the seaming process.

In the above-mentioned gluing mechanism 4, the gluing press roller 4a is movable up and down by the cylinder 4b so that the connecting agent is not applied by the length of the outer circumference of the mandrel 7 from the winding start end of the base paper A, and the shower mechanism 5 is By spraying moisture at the position where the base paper A is to be cut, giving flexibility to the beginning and end of the winding of the base paper to be wound around the mandrel 7, and preventing the occurrence of splashing,
It enables automatic winding and complete connection at the end of winding.

Inside the support base 15, a motor 1 is mounted on the rotating shaft 11 by detecting the orientation of the four circumferential surfaces of the mandrel body 8.
A positioning means 41 is provided for controlling the posture of the mandrel body 8 so that when the mandrel body 8 is stopped, the surface provided with the suction holes 23 is located at the top and the four circumferential surfaces are always oriented in the vertical and horizontal directions. A brake mechanism 42 is provided at the rear end to prevent the mandrel body 8 from rotating after positioning.

Therefore, during the process of extracting the rectangular paper tube B,
The rectangular paper tube B can be reliably extracted by the extraction plates 32, 32.

Note that drawing out, gluing, showering, cutting, seaming, demolding, etc. of the base paper are automatically controlled electrically based on signals input in advance, and the control mechanism changes according to each of the above conditions when the diameter of the mandrel 7 used changes. is now automatically selected.

The seaming device of this invention has the above-mentioned configuration, and when the mandrel 7 advances to the paper tube forming position as shown in FIG. The base paper A is pulled out in a position where the surface is square and the suction hole 23 is located at the top, passes through the gluing mechanism 4, the shower mechanism 5, and the cutter mechanism 6 in order, and is impregnated with moisture. When the tip faces the mandrel 7, the suction device 28 is activated and the tip is suctioned and fixed to the mandrel 7 through each suction hole 23.

Next, the brake mechanism 42 is opened, the mandrel 7 is rotated by starting the motor 16, the presser roller 33 is lowered, the push-up roller 35 is also raised, and the base paper A is wound around the outer circumference of the mandrel 7. . At this time, the adhesive is not applied to the base paper A by a length equal to the circumferential length of the mandrel 7 from the tip, which improves the mold releasability when the wound contact portion with the mandrel 7 is pulled out.

An adhesive is applied to the overlapping portion of the base paper A from the double stitch by the gluing mechanism 4, and is sequentially wrapped around the outer circumference of the mandrel 7 by applying pressure from the outside, and the overlapping surface is fixed with adhesive. be done.

When the winding of base paper A reaches the set length, first,
The gluing mechanism 4 stops applying the adhesive, then the shower mechanism 5 impregnates the end position of the adhesive application with moisture, and then the cutter mechanism 6 cuts the base paper A at the end position of the adhesive, and the base paper At the same time as the drawing of the base paper A stops, the mandrel 7 stops when the end of the base paper A reaches the upper part of the mandrel 7, and the heater 34 descends to heat and fix the end.

Presser roller 33, push-up roller 35, and heater 3
4 is separated from the mandrel 7, a rectangular paper tube B is completed on the outside of the mandrel 7, and the mandrel main body 8 is fixed in a predetermined position by the positioning means 41 and the brake mechanism 42. 1 unit
5, the mandrel 7 moves backward by the cylinder 14, and the trochanter 20 is released from the cam 22, so that the movable member 10 falls into the cutout 9 as shown in FIG. 8, and the movable member 10 becomes rectangular. By separating from the inner surface of the paper tube B, the mandrel 7 of the square paper tube B
The tightening force against is weakened.

The ends of the rectangular paper tube B come into contact with the pull-out plates 32, 32 placed during the retreat of the mandrel 7, and the movement of the rectangular paper tube B is blocked, so that the mandrel 7 is pulled out from inside the rectangular paper tube B. When the mandrel 7 reaches the retracted position, the rectangular paper tube B falls to the lower position and is ejected, completing the automatic demolding and moving to the 9th
A square paper tube B as shown in the figure is completed.

When the drawing is finished, the mandrel 7 returns to the forward position again, and the movable member 10 returns to the pushed-up position by the cam 22 and the roller 20, in preparation for the next winding of the paper tube.

〔effect〕

As described above, according to this invention, it becomes possible to automate the pulling out of the rectangular paper tube formed around the outer periphery of the rectangular columnar mandrel body with a simple structure, and to cut only one surface of the mandrel. Since an opening is provided and this is closed by a movable member, the square shape of the mandrel is improved, and a square paper tube with excellent strength and high precision can be manufactured at low cost.

In addition, by using a spring, cam, and trochanter, the movable member is retracted and pushed up to be flush with the outer periphery of the mandrel body by utilizing the forward and backward movement of the mandrel. There is no need to use a driving source, and the structure can be simplified.

Furthermore, the rectangular paper tube can be extracted simply by retracting the mandrel using the extraction plate, and the rectangular paper tube can be easily and reliably extracted from the mandrel.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a paper tube manufacturing apparatus using the seaming device according to this invention, Fig. 2 is an enlarged sectional view of the main parts of the same, Fig. 3 is a cross-sectional plan view of the same, and Fig. 4 is the same as the above. Fig. 5 is a left side view of the same, Fig. 6 is a longitudinal sectional view showing the state when the paper tube is pulled out, Fig. 7 is a perspective view showing the same mandrel as above, and Fig. 8 is a left side view of the same as above. 9 are perspective views of the completed rectangular paper tube. 1... Frame, 2... Sealing device, 4... Gluing mechanism, 6... Cutter mechanism, 7... Mandrel, 8
...Mandrel body, 9...Incision part, 10...
Movable member, 11... Rotating shaft, 18... Pivoting fitting,
19... Spring, 22... Cam, 32... Pulling plate, B... Square paper tube.

Claims (1)

[Scope of utility model registration request] The mandrel body, around which the paper tube is wound and formed, is formed into a square column shape, and the mandrel body is rotatably supported by a support stand so as to be movable in the axial direction in a horizontal state. A motor for rotating the mandrel body is provided on the support stand. A movable member, the outer surface of which becomes the outer circumferential surface of the mandrel body, is fitted into a cutout provided along the axial direction on one surface of the mandrel body, and one end of the movable member located on the support stand side is attached to the mandrel body by a pivot fitting, and the movable member is capable of swinging in the radial direction around the pivot fitting. a spring is provided between the free end of the mandrel body and the other end of the movable member for urging the movable member with a rotational elasticity in a direction in which its outer surface recedes from the outer circumferential surface of the mandrel body, a rotating shaft protruding from the center of the tip surface is fitted and held in a removable manner at a position opposite to the free end surface of the mandrel body when it has moved to the advanced position, a cam having an inclined surface on its outer circumferential surface is fixedly disposed, and when the mandrel body is in the advanced position, the tip of the movable member is placed on the inclined surface of the cam to push up the movable member,
A roller is attached to align the outer surface of the movable member with the outer peripheral surface of the mandrel body, and a pulling plate is disposed at the support base side end of the mandrel body in the forward position, the tip of which is close to the outer peripheral surface of the mandrel body, receives the end of the square paper tube when the mandrel body retracts, prevents it from moving, and pulls the square paper tube out of the mandrel body.