JPH0327017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a paper tube by spirally winding a paper tape around a mandrel.

As shown in FIG. 5, conventional spiral paper tubes are made by rotating two endless belts 2, 21 around a mandrel 1 between a pair of rollers 3, 31, 32, 33, respectively, and winding them around the mandrel 1 in a spiral shape. Paper tape T
The mandrel is manufactured by being wound more tightly with belts 2 and 21 and fed in the axial direction of the mandrel.

Figure 4 shows a conventional example of a spiral paper tube manufacturing machine, in which two pairs of rollers 3, 31, 3 on which each belt is applied
Of the rollers 2 and 33, each one roller 3 and 32 is mounted on the base 4.
The other rollers 31 and 33 are
is arranged on a pair of frames 5, 51 which are arranged in a substantially V-shape so that they can be opened and closed, so that they can be positioned in the longitudinal direction of the frames (Japanese Utility Model Publication No. 58-41195).

In the above device, when the tension of the belt is adjusted by changing the positions of the rollers 31 and 33 on the frame, the tension angle of the belt with respect to the mandrel 1 changes because the other rollers 3 and 32 are placed in fixed positions. There was a problem that the winding angle of the paper tape also changed.

Conversely, if you try to change the winding angle of the paper tape, the belt tension will also change. Therefore, it is necessary to adjust both the tension angle and the tension of the belt, and the adjustment work is troublesome.

Further, the drive mechanism for the four rollers 3 to 33 has four driven gears 61a and 61b meshing with a main gear 6a driven by a drive gear 60, and two of the driven gears 61a and 61a are connected to the positioning roller 3. , 32 are directly connected to the other two driven gears 61b, 61b, respectively.
bevel gear mechanism 62, spline shaft 63,
Adjustment roller 3 via second bevel gear mechanism 64
1 and 33 are connected.

As mentioned above, five gears including the drive gear 60 are meshed with the main gear 6a, and each gear 60, 61a, 6
1b and the members on each gear must be prevented from interfering with each other, the main gear 6a necessarily has a large diameter,
0 indicates a small diameter.

However, when the large-diameter main gear 6a is driven by the small-diameter drive gear 60, the drive is reduced, and when the large-diameter main gear 6a is used to drive the small-diameter follower gears 61a, 61b, the drive is increased. Incorporating a speed increase mechanism and a deceleration mechanism into one rotation transmission mechanism in this way causes a large loss of mechanical power and requires a large horsepower motor.

However, there are many problems such as the generation of vibration due to the rotation of the large-diameter main gear 6a, and the early damage of the bearing supporting the main gear due to this vibration.

Also, if the two belts 2 and 21 are stretched at symmetrical angles with respect to the mandrel 1, the force that wraps the paper tape around the mandrel 1 and pushes it downstream will theoretically be different between the two belts. There isn't.

Therefore, if there is no slip between the belt and the paper tape and the winding angle of the paper tape is properly set, the opening of the paper tube to be manufactured, that is, the gap between the spirally wound paper tapes should be constant. In reality, during operation, a slight difference in slip occurs between both belts and the paper tape, causing openings in the paper tube.

〔the purpose〕

In the present invention, the tension angle of the belt does not change even if the tension of the belt is adjusted, and the tension of the belt can be kept constant even if the tension angle of the belt is changed. The purpose is to provide a paper tube manufacturing device.

Another object of the present invention is to provide a paper tube manufacturing apparatus capable of spirally winding tape while preventing opening.

〔composition〕

The paper tube manufacturing apparatus of the present application has two pairs of rollers along the mandrel, one on the inside with a mandrel 1 in between.
A device that manufactures paper tubes by winding two endless belts around a mandrel and passing them around rollers on both sides of the mandrel, and then winding the paper tape around the mandrel in a spiral as the belts rotate and pushing it out downstream. The base ends of a pair of roller support frames 5, 51 are supported on a rotary table 41 across the mandrel 1, and the distal ends of the roller support frames 5, 51 are provided so as to be openable and closable. On the end side, there are first and third rollers 3, 32 on the center of rotation.
is arranged to connect the first and third rollers 3, 32 to a common drive wheel 6, and the distal end side of each roller support frame 5, 51 is movable in the longitudinal direction of the frame 5, 51. 2nd and 4th rollers 31 and 33 are arranged at the frame tip.
33 is characterized in that it rotates simultaneously in conjunction with the first and third rollers 3 and 32 at the base end of each frame, respectively.

[Action and effect]

A pair of rollers 3, 31, 3 on the same frame
By tensioning the belts 2 and 21 on the mandrels 2 and 33, even if the opening angle of the frames 5 and 51 is changed and the tension angle of the belt relative to the mandrel is adjusted,
The distance between the rollers 3, 31, 32, 33 does not change and therefore the tension of the belt does not change and readjustment of the tension is not necessary. Conversely, even if the tension is adjusted, the tension angle of the belt does not change, so there is no need to adjust the tension angle every time the tension is changed.

Since it is only necessary to engage the two driven wheels 61, 61 of the first and third rollers 3, 32 with the driving wheel 6,
The drive vehicle can be made smaller, eliminating the negative effects caused by conventional large drive vehicles.

Furthermore, by slightly rotating the rotary table 41, the angles of the support frames 5, 51 and thus both belts 2, 21 can be stretched at an asymmetrical angle with respect to the mandrel 1.
By making the angle of the second belt 21 smaller than the angle of the first belt 2 with respect to the mandrel 1, the extrusion speed of the paper tape by the second belt 21 is lowered than that of the first belt 2, and between both belts 2 and 21. A force is applied to reduce the gap between the paper tapes T,
This has the advantage of preventing gaps between the paper tapes, or so-called openings.

The present invention will be specifically described below based on embodiments shown in the drawings.

In FIG. 1, a paper tape T is wound on a mandrel 1 in the direction of arrow _A1 to form a paper tube, which is then pushed out in the direction of arrow _A2 .

The belt 2 on the upstream side is called a first belt, the belt 21 on the downstream side is called a second belt, and the two rollers 3, 31 on which the first belt 2 is stretched are called first and second rollers.
Two rollers 32, 3 for tensioning the second belt 21
3 are called the third and fourth rollers. In the example, the first
Between the third rollers 3 and 32, the second and fourth rollers 3
It is narrower than between 1 and 33.

A base 4 is disposed below the mandrel 1, and a circular hollow rotary table 41 is disposed on the base 4 so as to be rotatable in a horizontal plane.

On the upper surface of the rotary table 41, a pair of support frames 5,
The proximal end of the mandrel 51 passes below the mandrel 1 in a substantially V-shape in a horizontal plane, and the distal ends of the mandrel 51 are arranged so as to be openable and closable.

A worm gear 4 is located in the center of the bottom surface 42 of the rotary table 41.
3 is fixed, and a worm 45 that is rotationally driven by a manual handle 44 is connected to the gear 43 to constitute a rotation drive device 46 for the rotation table 41.

A drive main shaft 65 is provided through the bottom surface 42 of the turntable 41 and the worm gear 43 so as to be rotatable independently of the rotation of the turntable 41, and a small-diameter drive wheel 6 is fixed to the tip of the drive main shaft 65 to drive the The base end of the main shaft 65 is linked to a transmission motor 66.

A pair of driven wheels 61, 6 meshing with the driving wheel 6
1 is pivotally provided in the rotary table 41, and each driven wheel 61
The rotating shaft 67 extends upward through the rotating table 41, freely rotates through the base ends of the support frames 5, 51, and locks the first and second rollers 3, 31 at the penetrating ends. .

A guide groove 52 is formed in the support frames 5 and 51 from the proximal end side to the distal end side, and a slide block 53 is slidably fitted into the groove 52.
Second and fourth rollers 31 and 33 are disposed on the upper surface of the roller 3 so as to be freely rotatable.

A spline shaft 63 is rotatably disposed in the guide groove 52, and the tip of the shaft 63 is connected to the rotating shaft 67 by a bevel gear mechanism 62. The spline shaft 63 has a bevel gear 5 pivotally supported within the slide block 53.
4 is slidably fitted into the second and fourth rollers 3 through a threaded shaft 55 that meshes with the bevel gear 54.
1 and 33 are connected.

A screw shaft 55 for slide adjustment is screwed into the slide block 53, and a rotation manual handle 57 is linked to the screw shaft 55 via a gear transmission mechanism 56.

A frame opening/closing device 7 is connected between the supporting frames 5, 51, and the opening/closing device 7 is provided with receiving blocks 71, 71 on the lower surfaces of both the frames 5, 51 so as to be slidable in the longitudinal direction of the frames. A right-handed screw shaft 72 is screwed into one block 71, and a left-handed screw shaft 73 is screwed into the other block 71. Both screw shafts 72 and 73 are connected to a rotating shaft 75 through universal joints 74 and 74, and the shaft 75 is connected to a gear. They are connected by a manual handle 77 via a transmission means 76, and by turning the handle 77, the V-shaped opening of both frames 5, 51 can be expanded or contracted.

Thus, the mandrel 1 is wound between each of the two rollers 3, 31, 32, 33 on the same frame 5, 51, and the first and second belts 2, 21 are stretched.
The drive wheel 6 is rotated.

The driven wheel 61 and the first and third rollers 3 and 32 rotate, and the second and fourth rollers 31 and 33 are forcibly rotated via the bevel gear mechanism 62, spline shaft 63, and bevel gear 54, and the belts 2 and 21 are rotated. rotates, and this causes the paper tape T to move around the mandrel 1.
A paper tube is manufactured by winding the paper into a spiral shape.

When the thickness of the paper tube and the width of the paper tape are changed, the winding angle of the paper tape can be changed accordingly by adjusting the opening angle of the support frames 5, 51 by the opening/closing device 7, and the belts 2, 21 relative to the mandrel 1 are adjusted.
Change the tension angle.

Rollers 3, 3 for tensioning the belts 2, 21
1, 32, 33 are arranged on the same frame 5, 51, even if the opening angle of the frames 5, 51 is changed, the rollers 3, 31, 33 on the frames 5, 51
The distances 32 and 33 do not change and therefore the belt tension does not change.

Therefore, there is no need to readjust the tension every time the tension angle of the belt is changed as in the conventional case.

Also, even if the belt tension is adjusted, the tension angle of the belt does not change.

In the present invention, when the rotating table 41 is slightly rotated in a horizontal plane, the two support frames 5 on the rotating table 41,
The center of rotation of 51 can be displaced.

Therefore, as shown in FIG. 3, the angle θ ₁ of the first belt 2
By making the tension angle θ ₂ of the second belt 21 with respect to the mandrel 1 smaller than that of the first belt 2
A phenomenon in which the extrusion speed of the paper tape by the second belt can be made smaller than the extrusion speed of the paper tape by the belts 2 and 21, and a force acts between both belts 2 and 21 to reduce the gap between the paper tapes T, resulting in a gap between the spirally wound paper tapes.
So-called eye opening is prevented.

Furthermore, in the present invention, since only two driven wheels 61, 61 are engaged with the driving wheel 6, the driving wheel 6
can be made small in diameter, and the disadvantages caused by making the conventional drive wheel 6 large in diameter are eliminated.

If the width of the paper tape is wide, the distance between the first and third rollers 3 and 32 on the drive wheel 6 side is larger than the distance between the second and third rollers on the driving wheel 6 side.
The distance between the fourth rollers 31 and 33 may be narrowed.

It is also possible to use a belt stretched in an X-shape between the first roller 3 and the fourth roller 33 and between the second roller 31 and the third roller 32, respectively.

[Brief explanation of the drawing]

Figure 1 is a plan view of the paper tube manufacturing device, Figure 2 is a sectional view of the same, and Figure 3 shows the tension angle of the first belt
a plan view of an embodiment larger than that of the belt;
FIG. 4 is a plan view of the conventional example, and FIG. 5 is an explanatory diagram of the belt tension state of the conventional example. 1... Mandrel, 3, 31, 32, 33...
Roller, 41... Turntable, 5, 51... Support frame.

Claims (1)

[Claims] 1. Two pairs of rollers are placed along the mandrel, with one roller set on the inside of the mandrel 1, and two endless belts are wound around the mandrel and passed over the rollers on both sides of the mandrel. In this device, a pair of roller support frames 5, 5 straddles a mandrel 1, and a paper tube is manufactured by winding the paper spirally around a mandrel and extruding it downstream.
The base end of the roller supporting frame 5, 51 is rotatably supported on the rotary table 41, and the distal end sides of the roller support frames 5, 51 are provided so as to be openable and closable. rollers 3 and 32 are arranged and the first and third rollers 3 and 32 are connected to a common drive wheel 6;
Further, second and fourth rollers 31 and 33 are disposed on the distal end side of each roller support frame 5 and 51 so as to be movable in the longitudinal direction of the frames 5 and 51. , 33 is a spiral paper tube manufacturing device that rotates simultaneously in conjunction with the first and third rollers 3 and 32 at the base end of each frame.