JP2004345100A - Seamless belt take-over device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seamless belt take-over device capable of stably and continuously taking over even a seamless belt having a large inner diameter. <P>SOLUTION: This seamless belt take-over device is constituted so as to continuously take over the seamless belt extruded in a molten state from an annular die 1 to be molded and equipped with the outside take-over mechanism arranged outside the seamless belt and the inside take-over mechanism arranged inside the seamless belt corresponding to the outside take-over mechanism. The outside take-over mechanism is equipped with the first roller 10 arranged on the upstream side of a take-over direction, the second roller 11 arranged on the downstream side of the take-over direction and the take-over belt 13 trained over at least the first and second rollers 10 and 11. The inside take-over mechanism is equipped with the third roller 14 arranged on the downstream side of the first roller 10 and the upstream side of the second roller 11 so as to eject the seamless belt to the outside and the seamless belt is taken over while held by the take-over belt 13 and the third roller 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seamless belt take-up device for continuously taking a tubular seamless belt melt-extruded from a die.
[0002]
[Prior art]
2. Description of the Related Art Copiers and printers use a conductive belt wound around a plurality of support rollers as an intermediate transfer unit for transferring an image formed on the surface of a photosensitive drum or the like to a transfer material (paper or the like). Can be This belt is required to clean the toner adhered to the surface and to make the electric resistance uniform over the entire belt. Therefore, an endless belt having no joint, that is, a so-called seamless belt is preferably used.
[0003]
This seamless belt is continuously melt-extruded and formed into a tube shape from a so-called annular die. The melt-extruded seamless belt is cooled by a cooling mandrel provided below the annular die, and is continuously taken up by a seamless belt take-up device below the same. As such a take-up device, techniques disclosed in Patent Literatures 1 and 2 below are known.
[0004]
In Patent Literature 1, a tube body melt-extruded from an annular die is cooled by a cooling mandrel and taken up by a nip roll. The nip roll includes an outer roller arranged outside the seamless belt and an inner roller arranged inside, and the outer roller and the inner roller sandwich and take the seamless belt.
[0005]
In Patent Literature 2, a cylindrical core is disposed below a cooling mandrel, and four take-off devices are disposed around an outer periphery of the core. The take-off device includes a belt wound around a pair of rollers, and takes the belt in a state where the belt is sandwiched between the surface of the belt and the core.
[0006]
[Patent Document 1]
JP-A-2000-898 (paragraphs 0024 to 0026, FIG. 1)
[Patent Document 2]
JP-A-2000-280321 (Claim 1, FIG. 1)
[0007]
[Problems to be solved by the invention]
The above prior art has the following problems. That is, as in Patent Literature 1, when a roller is pulled between rollers, the roller comes into contact with the seamless belt at a point contact, so that a load is applied to the seamless belt and distortion occurs. In addition, when the take-up is performed only by the take-off belt as in Patent Literature 2, wrinkles are generated on the surface of the seamless belt due to a difference between a frictional force between the seamless belt and the take-up belt and a frictional force between the seamless belt and the core. there's a possibility that.
[0008]
In particular, in recent years, the inner diameter of the seamless belt tends to increase, the contact surface with a cooling mandrel (sizing die) increases, and the frictional force also increases. As a result, the force required for taking over is increasing. Therefore, a technique for stably pulling out the seamless belt even when the frictional force is increased is required.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seamless belt pulling device that can stably and continuously pull a seamless belt having a large inner diameter.
[Means for Solving the Problems]
In order to solve the above problems, the seamless belt pulling device according to the present invention is
A seamless belt take-up device for continuously taking a tubular seamless belt melt-extruded from a die,
An outer take-off mechanism arranged outside the seamless belt,
An inner take-up mechanism arranged inside the seamless belt corresponding to the outer take-up mechanism,
The outer take-off mechanism,
A first roller disposed upstream in the take-off direction;
A second roller disposed downstream;
At least a take-up belt wound around the first roller and the second roller,
The inner take-off mechanism,
A third roller disposed downstream of the first roller and upstream of the second roller, and disposed so as to project a seamless belt outward.
The present invention is characterized in that the take-up belt and the third roller are configured to take up the seamless belt while nipping the seamless belt.
The operation and effect of the seamless belt take-up device having this configuration are as follows. This take-up device includes an outer take-off mechanism arranged outside the seamless belt and an inner take-up mechanism arranged inside. The outer take-off mechanism includes a first roller, a second roller, and a take-up belt around which the first and second rollers are wound. The surface side of the seamless belt contacts the surface of the take-up belt. Further, a third roller is provided as an inner take-off mechanism, and is disposed at an intermediate position between the first roller and the second roller. Further, the third roller is arranged so that the seamless belt protrudes outward. Then, the seamless belt is picked up while being held between the pick-up belt and the third roller. Therefore, when the seamless belt is pulled, slipping hardly occurs, and the seamless belt does not wrinkle due to a difference in frictional force. In addition, by arranging the third roller in the direction in which the seamless belt projects as described above, tension can be applied to the take-up belt between the first roller and the second roller. Therefore, the seamless belt can be pulled with a stable force. As a result, it is possible to provide a seamless belt pulling device capable of stably and continuously pulling even a seamless belt having a large inner diameter.
[0010]
As a preferred embodiment of the present invention, the take-up belt is configured to wind around the first roller, the second roller, and an adjustment roller, and the position of the adjustment roller is changed to form the take-up belt. Of which the tension can be adjusted.
[0011]
Thereby, an appropriate tension can be applied to the take-up belt.
[0012]
As another preferred embodiment of the present invention, the cross-sectional shape of the outer peripheral surfaces of the first, second, and third rollers perpendicular to the take-off direction is formed in an arc shape along the cross-sectional shape of the seamless belt. Is raised.
[0013]
By forming the outer peripheral surface of each roller in an arc shape, the take-off operation can be performed without giving a large distortion to the seamless belt.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of a seamless belt take-up device according to the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of an annular die and a seamless belt take-up device.
[0015]
In FIG. 1, an annular die 1 has a substantially cylindrical shape whose axial direction extends along a vertical direction, and a supply unit 2 is provided at an upper portion. An extruder is connected to the supply unit 2, and the belt forming material is supplied from the direction of arrow A. An annular discharge port 3 is provided below the annular die 1, and a tubular seamless belt S is continuously melt-extruded and formed. Inside the annular die 1, a first path 4 extending in the horizontal direction and a second path 5 extending in the vertical direction are provided. The vertical path 5 is annular, thereby forming a tubular seamless belt. A heater is provided at an appropriate position in the inner and outer peripheral portions of the annular die 1 to melt the belt forming material.
[0016]
A known cooling mandrel 6 is provided below the annular die 1 and has a function of cooling the seamless belt melt-extruded from the annular discharge port 3. A mechanism (not shown) for guiding a cooling medium is provided inside the cooling mandrel 6.
[0017]
Further below the cooling mandrel 6, a seamless belt pulling device 7 (hereinafter abbreviated as a pulling device) according to the present invention for pulling a seamless belt is provided. As shown in FIG. 3, four take-off devices 7 are provided at equal intervals in the circumferential direction of the seamless belt S. FIG. 3 is a cross-sectional view taken along a plane (AA in FIG. 2) perpendicular to the direction in which the seamless belt S is taken off.
[0018]
Next, details of the take-up device 7 will be described. FIG. 2 is an enlarged view of a main part of the take-off device 7. The structure of the four take-off devices 7 is the same. The take-up device 7 is composed of an outer take-up mechanism arranged outside the seamless belt S and an inner take-up mechanism arranged inside. First, the outer take-off mechanism will be described. The first roller 10 is provided on the upstream side (upper side) in the take-up direction of the seamless belt S, and the second roller 11 is provided on the downstream side (lower side) in the take-up direction. A line connecting the rotation centers of the first roller 10 and the second roller 11 coincides with the vertical direction. The first roller 10 and the second roller 11 have the same outer diameter. An adjusting roller 12 is provided further outside the first and second rollers 10 and 11. Further, a rubber take-off belt 13 around which the first roller 10, the second roller 11, and the adjustment roller 12 are wound is provided. The position of the adjustment roller 12 can be changed, so that the tension of the take-off belt 13 can be adjusted.
[0019]
Further, as shown in FIG. 2, engagement protrusions 10a, 11a, and 12a are formed along the width direction of each roller. The take-up belt 13 also has an engagement recess 13a formed along the width direction, and is engaged with the engagement protrusions 10a, 11a, 12a of the rollers 10, 11, 12. Thereby, the take-up belt 13 can be reliably driven without causing a slip. A motor (not shown) for driving the take-off belt 13 is connected to the first roller 10 or the second roller 11.
[0020]
A third roller 14 is provided as an inner take-off mechanism. The third roller 14 is disposed downstream of the first roller 10 and upstream of the second roller 11. The rotation center of the third roller 14 is located exactly in the middle between the rotation center of the first roller 10 and the rotation center of the second roller 11 when viewed in the height direction. The third roller 14 is arranged such that the outer peripheral surface of the third roller 14 causes the seamless belt S to slightly project outward. The third roller 14 is also driven by a motor (not shown), but may be a driven roller interlocked with the driving of the take-off belt 13. Four third rollers 14 are also provided on the inside, and are mounted and supported by the support 15.
[0021]
When the seamless belt S is picked up and conveyed, the seamless belt S is picked up with the seamless belt sandwiched between the surface of the pick-up belt 13 and the peripheral surface of the third roller 14. Since the seamless belt S can be taken off from the surface of the take-up belt 13 or the surface of the third roller 14 without slipping, it can be taken out in a stable state. Further, even if the diameter of the seamless belt S is increased, the seamless belt is taken off in a surface contact state, so that the seamless belt can be taken out in a stable state.
[0022]
As shown in FIG. 3, the surfaces of the take-up belt 13 and the third roller 14 are flat surfaces, but are formed in an arc shape along the cross-sectional shape (circular) of the seamless belt S as shown in FIG. Is also good. That is, the front surface 13b of the take-up belt 13 has a concave arc shape, and the outer peripheral surfaces of the first and second rollers 10, 11 and the adjustment roller 12 wound around the take-up belt 13 have the same shape. The surface of the third roller 14 is formed in a convex arc shape. Thereby, the seamless belt S can be taken out without giving unnecessarily distortion. The cross-sectional shape does not have to be a perfect arc, may be an elliptical shape, or may be an arbitrary curved shape.
[0023]
In the embodiment of FIGS. 1 to 3, the example in which the take-off belt 13 is driven by engagement between the concave portion and the convex portion is shown. However, as shown in FIG. Holes 13a 'may be formed on both sides in the corresponding width direction of the belt 13, and the protrusions 10a' may be fitted into the holes 13a '.
[0024]
Alternatively, the take-off belt 13 may be formed thick, only the side that contacts the seamless belt may be formed into a concave arc shape as shown in FIG. 4, and the side that contacts the roller may be formed as a flat surface. In this case, as the shape of the roller, a roller having a normal form as shown in FIGS. 1 to 3 can be used.
[0025]
<Still another embodiment>
(1) The material of the seamless belt to be taken up is not limited to a specific material. The same applies to the use of the seamless belt.
[0026]
(2) The material of the roller used may be metallic or resin. The amount by which the third roller 14 causes the seamless belt to protrude outward can be appropriately set according to the characteristics of the seamless belt to be taken. In addition, the position of the third roller 14 may be adjusted so that the degree by which the seamless belt projects can be adjusted.
[0027]
(3) In the present embodiment, three rollers are wound by the take-off belt 13, but may be configured by only two of the first roller 10 and the second roller 11. In this case, either the position of the first roller 10 or the position of the second roller 11 may be moved so that the tension of the take-up belt 13 can be adjusted.
[Brief description of the drawings]
FIG. 1 is a view showing a configuration of an annular die and a seamless belt take-up device. FIG. 2 is an enlarged view of a main part of the take-up device. FIG. Cross section cut in various directions)
FIG. 4 is a diagram showing a configuration according to another embodiment.
DESCRIPTION OF SYMBOLS 1 Annular die 6 Cooling mandrel 7 Seamless belt take-up device 10 First roller 11 Second roller 12 Adjusting roller 13 Take-up belt 14 Third roller S Seamless belt

Claims (3)

A seamless belt take-up device for continuously taking a tubular seamless belt melt-extruded from a die,
An outer take-off mechanism arranged outside the seamless belt,
An inner take-up mechanism arranged inside the seamless belt corresponding to the outer take-up mechanism,
The outer take-off mechanism,
A first roller disposed upstream in the take-off direction;
A second roller disposed downstream;
At least a take-up belt wound around the first roller and the second roller,
The inner take-off mechanism,
A third roller disposed downstream of the first roller and upstream of the second roller, and disposed so as to project a seamless belt outward.
A seamless belt take-up device, wherein the take-up belt and the third roller are configured to take up the seamless belt while holding the seamless belt therebetween. The take-up belt is configured to wind the first roller, the second roller, and an adjustment roller, and by changing a position of the adjustment roller, the tension of the take-up belt can be adjusted. The seamless belt take-up device according to claim 1, wherein: 3. The cross section of the outer peripheral surface of the first, second, and third rollers perpendicular to the take-off direction is formed in an arc shape along the cross section of the seamless belt. 4. Seamless belt take-off device.

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