JPH11170355A - Method and apparatus for releasing cylindrical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for releasing a cylindrical film which can release the film automatically from a molding mold. SOLUTION: An apparatus for releasing a cylindrical film 4 molded by a column-shaped molding mold 11 from the mold 1, which is a hollow rubber grip member 104a for gripping the film 4 together with the mold 1, is equipped with the grip member 104a which is expanded by introducing gas to grip the film 4 together with the mold 1 from the periphery, an extrusion member 102 which contacts one end part of the mold 1 and extrudes the mold 1 from the film 4 with the film 4 gripped by the member 104a, and an air cylinder 103 for driving the extrusion member 102 in the extrusion direction of the mold 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for releasing a cylindrical film formed by winding a sheet film around a cylinder and releasing the cylindrical film from the mold.

[0002]

2. Description of the Related Art Conventionally, the operation of removing a cylindrical film formed by a cylindrical molding die and a cylindrical molding die disposed on the outer periphery thereof from the cylindrical molding die or the cylindrical molding die is performed manually using a tool. I was

[0003]

However, in order to cope with the automation of the production of the cylindrical film, it is essential to automatically release the cylindrical film from the molding die. Development was requested.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an apparatus and a method for releasing a cylindrical film from a molding die. It is to provide.

[0005]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a cylindrical film releasing device according to the present invention is a cylindrical film releasing device for releasing a cylindrical film formed by a cylindrical molding die from the molding die. A rubber-made hollow gripping member for gripping the cylindrical film together with the molding die, which is expanded by feeding gas and grips the cylindrical film together with the molding die from the outer periphery. A gripping member, and an extruding member for extruding the molding die from the cylindrical film by contacting one end of the molding die while the cylindrical film is gripped by the gripping member; and And a driving means for driving the molding die in an extrusion direction.

Further, in the cylindrical film releasing apparatus according to the present invention, the extruding member is a columnar member formed to have an outer diameter slightly smaller than the outer diameter of the molding die. I have.

Further, in the cylindrical film releasing apparatus according to the present invention, a fitting hole is formed at the one end of the mold, and the fitting hole is fitted at an end of the pushing member. It is characterized in that a fitting projection is formed.

Further, in the cylindrical film releasing apparatus according to the present invention, there is further provided a drawing means for gripping the other end of the forming die and pulling the forming die from the cylindrical film. And

Further, in the cylindrical film releasing apparatus according to the present invention, a groove is formed at the other end of the molding die, and the pulling-out means has a projection which engages with the groove. It is characterized by.

Further, in the cylindrical film releasing apparatus according to the present invention, the extracting means includes an air cylinder for driving the protrusion in a direction in which the molding die is extruded.

Further, in the cylindrical film releasing apparatus according to the present invention, the driving means is constituted by an air cylinder.

[0012] The method for releasing a cylindrical film according to the present invention is a method for releasing a cylindrical film from a molding die, the method comprising the steps of: A gripping step of gripping the cylindrical film together with the molding die from the outer periphery by gripping means, and in a state of being gripped by the gripping means, an extruding member is brought into contact with one end of the molding die, and the molding die is moved. It is characterized by comprising an extrusion step of extruding from the cylindrical film, and a pulling step of pulling out the molding die from the cylindrical film by gripping the other end of the molding die with a gripping means.

Further, in the method for releasing a cylindrical film according to the present invention, the extrusion member is a columnar member formed to have an outer diameter slightly smaller than the outer diameter of the forming die. I have.

In the method for releasing a cylindrical film according to the present invention, a fitting hole is formed at the one end of the molding die, and the fitting hole is fitted at an end of the extrusion member. It is characterized in that a fitting projection is formed.

In the method for releasing a cylindrical film according to the present invention, a groove is formed at the other end of the molding die, and the gripping means has a projection which engages with the groove. It is characterized by.

Further, the cylindrical film releasing apparatus according to the present invention is a cylindrical film releasing apparatus for releasing a cylindrical film formed by a cylindrical forming die from an inner peripheral surface of the forming die. An apparatus, comprising: gripping means for gripping the molding die from the outer periphery; and a hollow contact member made of rubber, which is inserted into an inner peripheral portion of the cylindrical film and gas is introduced. A contact member that expands due to and adheres to the inner peripheral surface of the cylindrical film, and a pulling unit that pulls out the adherent member from the molding die in a state where the adherent member adheres to the inner peripheral surface of the cylindrical film. It is characterized by having.

Further, in the cylindrical film releasing apparatus according to the present invention, the pressure of the gas fed into the close contact member is controlled by the first pressure for peeling the cylindrical film from the forming die and the cylindrical pressure. Switching means for switching to a second pressure lower than the first pressure for gripping the cylindrical film without deforming after the cylindrical film is peeled from the mold, and wherein the cylindrical film is formed by the molding. A sensor for detecting detachment from the mold, wherein the switching unit switches between the first pressure and the second pressure based on a detection signal of the sensor.

Further, in the cylindrical film releasing apparatus according to the present invention, the extracting means is constituted by an air cylinder.

Further, the method for releasing a cylindrical film according to the present invention is characterized in that the method for releasing a cylindrical film formed by a cylindrical mold from an inner peripheral surface of the mold is provided. A method for gripping the mold from the outer periphery, an inserting step of inserting a rubber-made hollow contact member into an inner peripheral portion of the cylindrical film, and air inside the contact member. Is fed and expanded, and in the contact step of bringing the inner peripheral surface of the cylindrical film into close contact with the inner peripheral surface of the cylindrical film,
A step of pulling out the contact member from the mold.

Further, in the method for releasing a cylindrical film according to the present invention, in the contacting step, a gas at a first pressure for releasing the cylindrical film from the molding die is introduced, and After the film is peeled from the mold, the pressure is switched to a second pressure lower than the first pressure for gripping the cylindrical film without deformation.

Further, in the method of releasing a cylindrical film according to the present invention, the drawing step is performed by driving the close contact member by an air cylinder.

[0022]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 6 is a view for explaining a method of forming a cylindrical film to which the release method according to the embodiment is applied.

In order to form the cylindrical film, first, an aluminum material having a relatively large coefficient of thermal expansion (thermal expansion coefficient: Wind around a cylindrical inner mold 1 using 2.4 × 10 −5). Thereafter, a stainless steel material having a lower coefficient of thermal expansion than the cylindrical inner mold 1 (coefficient of thermal expansion: 1.
The inner mold 1 and the sheet film 4 are inserted into a cylindrical outer mold 2 using 5 × 10 −5). Outer diameter of inner mold 1 and outer mold 4
Is set to such a size that a gap having a predetermined thickness is formed between the outer peripheral surface of the inner mold 1 and the inner peripheral surface of the outer mold 2 during the heat molding. In this state, the heating furnace is used to perform heat forming by a heating process determined according to the melting temperature of the film material and the thermal deterioration characteristics of the film.

When the inner mold 1, the film 4, and the outer mold 2 are heated, the inner mold 1 and the outer mold 2 begin to expand according to their respective thermal expansion coefficients, and the film 4 softens as the temperature rises.
When a predetermined heating state is reached, the gap between the outer peripheral surface of the inner mold 1 and the inner peripheral surface of the outer mold 2 becomes a desired film thickness while the softened film is sandwiched, and the step of the overlapping portion of the film 4 is reduced. Will be erased.

After the step of the film is eliminated, the inner mold 1,
The film 4 and the outer mold 2 are cooled, the outer mold 2 is removed, and the cylindrically formed film 4 remains in the inner mold 1. Finally, inner mold 1
Is pulled out (released) from the formed cylindrical film 4 to complete the cylindrical film 4.

FIG. 2 is a side view showing the structure of a release device for releasing the cylindrical film 4 from the inner die 1.
3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is a sectional view taken along line BB of FIG.

2 to 4, reference numeral 1 denotes an inner mold after the cylindrical film 4 is formed, and the cylindrical film 4 is left on the outer peripheral surface thereof without being released. Inner mold 1
2 has a fitting hole 1a for fitting with the inner die pushing rod 102 at the right end thereof, and an inner die pulling mechanism 110 at a portion near the left end in the figure where the cylindrical film 4 does not exist. Has a groove 1b for engagement with the jaw 112.

The inner die pushing rod 102 is formed in a cylindrical shape having a diameter slightly smaller than the outer diameter of the inner die 1, and has a fitting portion 102 a that fits into the fitting hole 1 a of the inner die 1 at the tip. Have. The inner extrusion rod 102 is attached to an extrusion air cylinder 103. The inner die 1 is set by being inserted into the fitting portion 102a of the push rod 102.

Reference numeral 104 denotes a rubber actuator for holding the formed cylindrical film 4 together with the inner mold 1, and is a metal ring-shaped base 1 having an air supply / exhaust port.
A hollow body 104a of chloroprene rubber is attached to the inside of 14. By injecting air into the hollow body 104a, the hollow body 104a expands inward, and holds the cylindrical film 4 and the inner mold 1 firmly in a soft and large area without damaging the cylindrical film 4. The actuator 104 is attached to a column 105 and is fixed to the device base 106. Reference numeral 116 denotes a straightening plate 107 for correcting deformation of the hollow body 104a in the pulling direction when the inner die 1 is pulled out from the cylindrical film 4.
Is an inner mold gripping mechanism for gripping the inner mold 1 when the inner mold 1 is pulled out. This air cylinder 118 is
The stage 122 includes a stage 122 which is attached via the first cylinder 0 and a pull-out air cylinder 124 for moving and driving the stage 122 in the direction of arrow C in FIG.

FIGS. 5 to 10 are views showing the operation of the release device.

First, as shown in FIG. 5, the inner die 1 after forming the cylindrical film 4 is inserted into the fitting part 102a of the inner die extruding rod 102 and attached.

Next, as shown in FIG. 6, the hollow body 104a is expanded inward by supplying air to the actuator 104, and the cylindrical film 4 is gripped together with the inner mold 1.

Next, as shown in FIG. 7, while the cylindrical film 4 is held by the actuator 104, the inner die pushing rod 102 is pushed by the pushing air cylinder 103.
Is extruded leftward in the figure, and the inner mold 1 is extruded from the cylindrical film 4. The cylindrical film 4 has a hollow body 104 made of rubber.
It stays at that position due to the frictional force with a, and is in a state of being transferred to the inner die pushing rod 102 by the holding length of the actuator 104.

Next, as shown in FIG.
When the jaw 112 is closed by operating the 18, the portion of the groove 1 b of the inner mold 1 is grasped.

Next, the air cylinder 124 is operated to pull out the inner mold 1 from the cylindrical film 4 as shown by an arrow D in FIG. The removed inner mold 1 is shown in FIG.
As shown in (1), the jaw 112 is released and collected at the end of extraction of the extraction air cylinder 124.

Next, as shown in FIG. 10, the air from the actuator 104 is discharged to release the gripping of the inner extrusion rod 102 and the cylindrical film 4, and
By extracting the cylindrical film 4 from the inner extrusion rod 102, the cylindrical film 4 is completely released.

As described above, according to the present embodiment, the cylindrical film can be automatically released from the cylindrical inner mold.

(Second Embodiment) In the first embodiment, when a cylindrical film is formed by sandwiching a film between a cylindrical inner mold and a cylindrical outer mold, the cylindrical mold is removed. Although the case where the film has adhered to the inner mold side has been described, the cylindrical film may adhere to the outer mold depending on the method of selecting the coefficient of thermal expansion of the materials of the inner mold and the outer mold.

In the second embodiment, a description will be given of a mold release device in a case where a formed cylindrical film is adhered to an outer mold.

FIG. 11 is a side view showing the structure of a release device for releasing the cylindrical film 4 from the outer die 2. As shown in FIG.

Reference numeral 2 denotes an outer mold for molding, and a cylindrical film 4 is molded by its inner surface. Numerals 203a to 203d denote outer mold gripping mechanisms having claws at their ends for centering and gripping the outer mold 2. Reference numeral 204 denotes a sensor for detecting the presence or absence of the outer mold 2, and reference numeral 205 denotes a sensor for detecting the presence or absence of the cylindrical film 4, each of which is connected to an input of the program controller 210.

Reference numeral 206 denotes a rubber gripping member for gripping the cylindrical film 4 and releasing it from the mold, and grips the cylindrical film 4 by expanding it into a balloon shape. Reference numeral 207 denotes an air cylinder for pulling out the cylindrical film 4 from the outer mold 2, and the above-mentioned gripping member 206 is attached to a tip end. Reference numerals 208a and 208b denote switching mechanisms for switching the air pressure formed by two air valves, and a first mechanism necessary for peeling the cylindrical film 4 from the outer mold 4.
And the second air pressure lower than the first air pressure, which is the minimum necessary for transporting the cylindrical film 4 after peeling.

209a and 209b are respectively a first air pressure necessary for releasing the cylindrical film 4 from the outer mold 2 from the original pressure of the compressed air supply source, and the cylindrical film 4 after peeling. This is a regulation that produces a second air pressure lower than the first air pressure, which is the minimum required for transport.

Reference numeral 211 denotes a stopper table for setting the outer mold 2, and reference numeral 212 denotes a table on which the released cylindrical film 4 is placed. Note that in FIG.
The air piping and wiring to the air cylinder 207 are not shown.

FIGS. 12 to 16 are views showing the operation of the release device. First, as shown in FIG.
When the outer mold 2 to which the cylindrical film is attached is recognized by 04 to be set on the stopper base 211 of the apparatus, the outer mold 2 is centripably held by the outer mold holding mechanism 203.
Thereafter, the cylinder rod 207a of the air cylinder 207 for pulling out the cylindrical film 4 is extended.

Next, as shown in FIG. 13, after the cylinder rod 207a reaches the forward end, the first air pressure necessary for peeling the cylindrical film 4 from the outer mold 2 is changed by the switching mechanism 208. It is supplied to the holding member 206.

Next, as shown in FIG.
With the cylinder 6 fully expanded and holding the cylindrical film 4 with a sufficient friction pressure, the cylinder rod 207a of the air cylinder 207 is pulled in to start releasing. In the meantime, when the end of the cylindrical film 4 is detected by the sensor 205 for detecting the presence or absence of the cylindrical film 4, in order to transport the cylindrical film 4 lower than the first air pressure. Switch to the minimum required second air pressure. The reason for switching from the first air pressure to the second air pressure is as follows. The first air pressure is an air pressure for generating a frictional force necessary for peeling and separating the film from the outer mold 2. At a position where the gripping portion is separated from the outer mold as it is, the first air pressure expands outward to form the film film. It will be deformed. For this reason, at a position where the gripping portion comes off from the outer mold 2, the film is dropped to a second air pressure for gripping without deforming the film and gripping is performed.

Next, as shown in FIG. 15, during the release,
Sensor 20 for detecting the presence or absence of cylindrical film 4
When it is detected that the rear end of the cylindrical film 4 has passed, as shown in FIG. 16, the second air pressure is exhausted, and the cylindrical film released from the outer mold 2 is placed on the table. 21
Drop to 2.

According to the above method, the cylindrical film can be automatically released from the outer mold 2.

FIG. 17 is a diagram showing an LBP as an example of a product using a heat fixing film which is a cylindrical film released from the mold according to the method of the present embodiment, and a fixing portion of a copying machine.

In FIG. 17, the toner transferred onto the paper 306E is supplied to the heater holder 306B and the transport roller 3A.
06D, and the ceramic heater 3 disposed with the fixing film 320 (cylindrical film 4) interposed therebetween.
06A for heat fixing. The fixing film 320
A thin film rotatable on the heater holder 306B, and rotates together with the paper 306E while fixing the toner.

FIG. 18 is a view showing the construction of an LBP, which is a product using a cylindrical film as a transfer belt, and a developing portion of a copying machine.

In FIG. 18, the negatively charged toner is transferred from the photosensitive drum 407 to the positively charged transfer drum 408.
, And then conveyed onto paper 409. The transfer belt 420 (cylindrical film 4) is attached to a transfer roller 421 to which a bias voltage is applied, and the surface layer of the belt is charged to + ions having a higher potential than the transfer drum 408. Then, the paper 4 on the transfer drum 408 side
The secondary transfer of the toner from the transfer drum 408 onto the paper 409 is performed by charging the surface of the image 09 to a strong +. The paper 409 is transferred by the transfer belt 420 to the transfer drum 408.
And is transported to the next step.

[0055]

As described above, according to the present invention,
The cylindrical film can be smoothly released from the cylindrical inner mold without causing any damage or breakage.

Further, by providing a groove at the end of the cylindrical inner mold and providing a mechanism for engaging with the groove in the pulling mechanism, the cylindrical film can be reliably pulled out from the cylindrical inner die. .

Further, since the outer diameter of the extruding member for extruding the cylindrical inner mold is smaller than the outer diameter of the inner mold, the transfer of the cylindrical film can be performed smoothly.

Further, when the cylindrical film is released from the outer mold, it is possible to prevent the cylindrical film from being wrinkled or broken, and to prevent the cylindrical film from swelling and deforming upon release.

[0059]

[Brief description of the drawings]

FIG. 1 is a view for explaining a method of forming a cylindrical film to which a release method according to a first embodiment of the present invention is applied.

FIG. 2 is a side view showing a configuration of a release device for releasing a cylindrical film from an inner die.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a diagram illustrating an operation of the release device according to the first embodiment.

FIG. 6 is a diagram illustrating an operation of the release device according to the first embodiment.

FIG. 7 is a view showing the operation of the release device of the first embodiment.

FIG. 8 is a diagram showing the operation of the release device of the first embodiment.

FIG. 9 is a view showing the operation of the release device of the first embodiment.

FIG. 10 is a diagram showing an operation of the release device of the first embodiment.

FIG. 11 is a side view showing a configuration of a release device for releasing a cylindrical film from an outer die.

FIG. 12 is a view showing the operation of the release device of the second embodiment.

FIG. 13 is a diagram illustrating an operation of the release device according to the second embodiment.

FIG. 14 is a diagram illustrating an operation of the release device according to the second embodiment.

FIG. 15 is a view showing the operation of the release device of the second embodiment.

FIG. 16 is a diagram illustrating an operation of the release device according to the second embodiment.

FIG. 17 is a view showing an example of a product using a heat fixing film which is a cylindrical film.

FIG. 18 is a diagram illustrating an example of a product using a transfer belt that is a cylindrical film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner die 2 Outer die 4 Cylindrical film 102 Inner die pushing rod 103 Extruding air cylinder 104 Actuator 105 Support 106 Device base 107 Inner die gripping mechanism 110 Inner die pulling mechanism 112 Jaw 114 Ring-shaped base 116 Straightening plate 118 Air cylinder 120 Support 122 Stage 124 Pull-out air cylinder 204, 205 Sensor 206 Holding member 207 Air cylinder 210 Program controller 211 Stopper base 212 Stand

Claims (17)

[Claims] 1. A cylindrical film releasing apparatus for releasing a cylindrical film formed by a cylindrical molding die from the molding die, the gripping device including the cylindrical film together with the molding die. A gripping member made of rubber, which is expanded by feeding gas and grips the cylindrical film from the outer periphery together with the molding die; and the cylindrical film is gripped by the gripping member. In this state, an extruding member for abutting against one end of the molding die and extruding the molding die from the cylindrical film, and a driving unit for driving the extruding member in the extrusion direction of the molding die. A cylindrical film releasing device, comprising: 2. The mold release of a cylindrical film according to claim 1, wherein the extruding member is a columnar member having an outer diameter slightly smaller than an outer diameter of the mold. apparatus. 3. A fitting hole is formed at said one end of said molding die, and a fitting projection fitted into said fitting hole is formed at an end of said extruding member. The cylindrical film releasing device according to claim 1. 4. The cylindrical film separating apparatus according to claim 1, further comprising a drawing means for gripping the other end of the forming die and pulling the forming die from the cylindrical film. Mold device. 5. The cylindrical film according to claim 4, wherein a groove is formed in the other end of the molding die, and the pull-out means has a projection that engages with the groove. Release equipment. 6. The apparatus for releasing a cylindrical film according to claim 4, wherein said pull-out means includes an air cylinder for driving said projection in a direction in which said mold is pushed out. 7. The apparatus according to claim 1, wherein the driving means comprises an air cylinder. 8. A method of releasing a cylindrical film from a molding die, the method comprising: releasing a cylindrical film formed by a cylindrical molding die from the molding die; A gripping step of gripping by means, an extrusion step of abutting an extruding member on one end of the molding die in a state of being gripped by the gripping means, and extruding the molding die from the cylindrical film; A step of gripping the other end of the cylindrical film with a gripping means and pulling out the molding die from the cylindrical film. 9. The mold release of a cylindrical film according to claim 8, wherein the extruding member is a columnar member having an outer diameter slightly smaller than an outer diameter of the molding die. Method. 10. A fitting hole is formed at said one end of said molding die, and a fitting projection fitted to said fitting hole is formed at an end of said extruding member. The method for releasing a cylindrical film according to claim 8. 11. The cylindrical film according to claim 8, wherein a groove is formed at the other end of the molding die, and the gripping means has a projection that engages with the groove. Release method. 12. A cylindrical film releasing apparatus for releasing a cylindrical film formed by a cylindrical mold from an inner peripheral surface of the molding die, wherein the molding die is gripped from an outer periphery. Gripping means for, a hollow contact member made of rubber, which is inserted into the inner peripheral portion of the cylindrical film, expands by gas being introduced, and expands on the inner peripheral surface of the cylindrical film. A mold release of a cylindrical film, comprising: a close contact member that adheres, and a pull-out unit that pulls out the close contact member from the mold in a state where the close contact member is in close contact with an inner peripheral surface of the cylindrical film. apparatus. 13. The pressure of the gas fed into the close contact member is changed to a first pressure for separating the cylindrical film from the mold and the cylindrical pressure after the cylindrical film is separated from the mold. A switching unit for switching to a second pressure lower than the first pressure for holding the film without deforming, and a sensor for detecting that the cylindrical film has been peeled from the mold. 13. The cylindrical film release device according to claim 12, further comprising a switching unit that switches between the first pressure and the second pressure based on a detection signal of the sensor. 14. An apparatus according to claim 12, wherein said drawing means comprises an air cylinder. 15. A cylindrical film releasing method for releasing a cylindrical film formed by a cylindrical forming die from an inner peripheral surface of the forming die, wherein the forming die is gripped from an outer periphery. A gripping step for inserting a rubber hollow contact member into an inner peripheral portion of the cylindrical film; and A cylinder comprising: a step of bringing the contact member into close contact with the inner peripheral surface; and a step of pulling out the contact member from the mold in a state where the contact member adheres to the inner peripheral surface of the cylindrical film. Release method for a film-like film. 16. In the contacting step, a gas at a first pressure for releasing the cylindrical film from the molding die is supplied, and after the cylindrical film is released from the molding die, the cylindrical film is removed. The method for releasing a cylindrical film according to claim 15, wherein the pressure is switched to a second pressure lower than the first pressure for gripping the cylindrical film without deformation. 17. The method according to claim 15, wherein the drawing step is performed by driving the contact member with an air cylinder.