JP2014113700A - Extrusion molding machine of rubber roller, and production method of rubber roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform that a shape error of a rubber roller is satisfactorily reduced even when a feedback gain cannot be raised by a detection time delay of an external diameter.SOLUTION: An extrusion molding machine of a rubber roller includes: a feed-forward control instrument that outputs a command value of a feed rate of a core grid; an external diameter measuring device that measures an external diameter of the rubber roller extruded from an outlet of a cross head, and outputs an external diameter measured value; a reference input shift instrument that outputs a reference input in which a prescribed external diameter target value of the rubber roller is shifted; and a feedback control instrument in which a command value of a feed rate of the core grid that is output from the feed-forward control instrument is compensated so that the external diameter measured value of the rubber roller may agree with the reference input.

Description

  The present invention relates to an extrusion molding machine for manufacturing a rubber roller, and a method for manufacturing a rubber roller.

  A rubber roller, which is a cylindrical rubber member centering on a cored bar, is used for a charging roller, a developing roller, or the like used in an electrophotographic apparatus. In general, an extrusion molding machine is used in the process of manufacturing a rubber roller.

  A general extrusion molding machine is a rubber roller in which a molten rubber material and a core metal having a predetermined length are simultaneously fed into a cross head, and a rubber material having a predetermined thickness is coated on the outer periphery of the core metal. Is pushed out from the outlet of the crosshead. In such an extrusion molding machine, one rubber roller is continuously obtained for each cored bar from the outlet of the cross head.

  The thickness of the rubber material in the rubber roller can be adjusted by changing the feed speed of the metal core to the cross head and the feed speed of the rubber material to the cross head. Thereby, for example, as shown in FIG. 6, the rubber roller can be formed into a shape called a crown shape in which the central portion of the rubber material 62 swells. The rubber material at both ends of the rubber roller is removed in a later separate process. Therefore, as shown in FIG. 6, both ends of the cored bar 61 are exposed in the completed rubber roller 67.

  The outer diameter of the rubber roller is about 5 mm to 10 mm, and the difference between the maximum diameter and the minimum diameter of the crown-shaped portion is, for example, about 200 μm. The length of the rubber roller is about 250 mm for A4 size paper and about 370 mm for A3 size paper. The outer diameter of the cored bar is about 4 mm to 8 mm.

  In recent years, with improvement in performance of electrophotographic apparatuses, improvement in shape accuracy of rubber rollers has been demanded. Patent Literature 1 and Patent Literature 2 disclose feedback control technology of an extrusion molding machine for improving the shape accuracy of a rubber roller.

  In the feedback control of the extrusion molding machine disclosed in Patent Document 1 and Patent Document 2, based on the measured value of the outer diameter of the rubber roller obtained by the outer diameter measuring device installed near the outlet end of the crosshead, Control the feed rate and feed rate of rubber material. Thereby, the shape error of the rubber roller with respect to a predetermined crown shape is reduced.

JP 2009-0666808 A JP 2010-058278 A

  According to the extrusion molding machines disclosed in Patent Document 1 and Patent Document 2, the shape error of the rubber roller with respect to a predetermined crown shape is reduced by removing the influence of physical property value change and temperature change of the rubber material by feedback control. can do.

  However, if the feedback gain is increased in order to further reduce the shape error, the shape error may increase on the contrary. The main cause is a delay in detection time that occurs because the outer diameter measuring instrument is installed about 10 mm away from the crosshead outlet end. According to the control theory, such a detection time delay is known as a dead time characteristic, and the phase is greatly delayed in the feedback loop, which causes vibration when the feedback gain is increased.

  For this reason, there is a limit to increasing the feedback gain, and as a result, it has been difficult to further reduce the shape error of the rubber roller.

  In FIG. 7, the numerical simulation result which shows the performance of the extrusion molding machine concerning a prior art example is shown. The upper row is a waveform overlay of a predetermined crown shape r and outer diameter measurement value z. Since four rubber rollers are extruded in about 20 seconds, four crown shapes appear. The lower row is a waveform of an outer diameter error e which is a difference between a predetermined crown shape r and an outer diameter measurement value z. It can be seen that the maximum outer diameter error is about ± 40 μm and the shape error of the rubber roller cannot be sufficiently reduced, such as being left-right asymmetric.

  Therefore, the present invention provides a rubber roller extrusion molding machine and a rubber roller manufacturing method that can further reduce the shape error of the rubber roller even when the feedback gain cannot be increased due to the detection time delay in the outer diameter measuring instrument. The purpose is to do.

According to the present invention, the core metal feed driving means for continuously feeding a plurality of core bars of a predetermined length to the cross head in the longitudinal direction of the core metal, and the molten rubber material is fed to the cross head A rubber feed driving means, and a rubber roller extrusion molding machine for extruding a rubber roller covered with the rubber material from the outlet of the crosshead, each having a core material,
A feedforward controller that outputs a command value of the feed rate of the cored bar by the cored bar feed driving means;
An outer diameter measuring instrument that is provided near the outlet of the crosshead, measures the outer diameter of the rubber roller pushed out from the outlet of the crosshead, and outputs the measured outer diameter;
A reference input shifter for outputting a reference input obtained by shifting a predetermined outer diameter target value of the rubber roller;
A feedback controller that corrects a command value of the feed rate of the core metal output from the feedforward controller so that the measured outer diameter value of the rubber roller matches the reference input. A machine is provided.

Further, according to the present invention, a core metal feed driving means for continuously feeding a plurality of core bars of a predetermined length to the cross head in the longitudinal direction of the core metal, and a molten rubber material for the cross head A rubber feed driving means for feeding into the rubber roller, and a rubber roller manufacturing method by an extrusion molding machine for extruding a rubber roller covered with the rubber material from the outlet of the crosshead,
Output a command value of the feed rate of the cored bar by the cored bar feed driving means,
Measure the outer diameter of the rubber roller extruded from the outlet of the crosshead,
Output a reference input by shifting a predetermined outer diameter target value of the rubber roller,
There is provided a method of manufacturing a rubber roller, wherein the command value of the feed rate of the core metal is corrected so that the measured outer diameter value of the rubber roller matches the reference input.

  According to the present invention, even when the feedback gain cannot be increased due to the detection time delay in the outer diameter measuring instrument, the effect that the shape error of the rubber roller can be sufficiently reduced can be obtained.

It is a schematic block diagram of the extrusion molding machine of the rubber roller which concerns on the 1st Embodiment of this invention. It is a numerical simulation result which shows the performance of the extrusion molding machine of this invention. It is step response data in a preliminary process. It is a schematic block diagram of the extrusion molding machine of the rubber roller which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram of the extrusion molding machine of the rubber roller which concerns on the 3rd Embodiment of this invention. It is a rubber roller manufactured by an extrusion molding machine. It is a numerical simulation result which shows the performance of the conventional extrusion molding machine.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic configuration diagram of a rubber roller extrusion molding machine 100 according to a first embodiment of the present invention. The extrusion molding machine 100 is an apparatus for manufacturing a rubber roller 7 that covers the entire circumference of the core metal 1 and covers the rubber material 2 with the core metal 1 in the center.

  The extrusion molding machine 100 includes a crosshead 3 into which a core metal 1 and a molten rubber material are fed, a roller 6 serving as a core metal feed driving means for feeding the core metal 1 into the crosshead 3, and a rubber material into the crosshead 3. And a cylinder 4 which is a passage for feeding the air.

  The roller 6 continuously feeds the plurality of core bars 1 to the crosshead 3 in the longitudinal direction. 1a is an abutting portion where the ends of different cores 1 come into contact. The cylinder 4 includes a screw 5 inside, and the molten rubber material 2 is fed into the crosshead 3 by the rotation of the screw 5. When the core metal 1 is fed into the crosshead 3, the entire circumference is covered with the molten rubber material 2 fed into the crosshead 3 from the cylinder 4. Then, the core metal 1 is sent out from the outlet 3a of the cross head 3 as a rubber roller 7 with the rubber material 2 attached to the surface.

  In the extrusion molding machine 100, a so-called crown-shaped rubber roller 7 in which the outer diameter of the rubber material 2 is large is formed at the longitudinal center of each core bar 1. For this purpose, the feed speed of the core 1 by the roller 6 and the feed speed of the rubber material 2 by the screw 5 may be changed.

  The thickness of the rubber material 2 adhering to the cored bar 1 becomes thinner when the feeding speed of the cored bar 1 is increased, and becomes thicker when the feeding speed is decreased. On the other hand, the thickness of the rubber material 2 adhering to the metal core 1 becomes thicker when the feeding speed of the rubber material 2 is increased, and becomes thinner when the rubber material 2 is slowed.

  Thus, the thickness of the rubber material 2 attached to the core metal 1 can be adjusted by either the feed speed of the core metal 1 or the feed speed of the rubber material 2.

  However, the response when the thickness of the rubber material 2 is changed is faster when the feed speed of the metal core 1 is changed by the roller 6 than when the feed speed of the rubber material is changed by the screw 5. Therefore, it is more effective to adjust the thickness of the rubber material 2 adhering to the metal core 1, that is, the rubber outer diameter, by controlling the feed speed of the metal core 1 with the roller 6.

  The feed speed of the core bar 1 by the roller 6 is adjusted by a servo motor 8 connected to the roller 6. The servo motor 8 includes an encoder 9 that can detect the rotation speed and rotation angle of the servo motor 8. The feed speed of the rubber material 2 by the screw 5 is adjusted by the rotational speed of an induction motor (not shown) connected to the screw 5. The rubber rollers 7 sent out from the outlet 3a of the cross head 3 are received one by one per core bar by the take-up machine 10, and are sequentially placed on a pallet (not shown).

  Next, a control system in the extrusion molding machine 100 will be described. The control system includes an outer diameter measuring device 11, a target outer diameter generator 15a, a reference input shift device 16a, a feedback controller (FB controller) 17, a driver 18, a mandrel speed calculator 20, a delay time calculator 21, and The feed forward controller (FF controller) 19a is configured.

  The outer diameter measuring device 11 preferably has a principle of measuring the light-shielding dimension by projecting and receiving a sheet-like laser beam with the rubber roller 7 interposed therebetween. The outer diameter measuring device 11 is arranged in the vicinity of the outlet 3 a of the cross head 3, measures the outer diameter of the rubber roller 7 sent out from the outlet 3 a, and transmits the outer diameter measurement value z to the FB controller 17. The FB controller 17 receives the outer diameter error e which is the difference between the reference input r, which is the output of the reference input shifter 16a, and the outer diameter measurement value z of the rubber roller 7 by the outer diameter measuring device 11, and performs FB control. Unit output u is output.

  Here, for example, a PID filter is used for the FB controller 17. Then, the rotational speed of the servo motor 8 is controlled via the driver 18 so that the outer diameter error e is reduced.

  As a result, the cored bar 1 is fed into the crosshead 3 by the roller 6 so that the outer diameter measurement value z of the rubber roller 7 matches the reference input r. By such a function of the feedback control system, the shape error of the rubber roller 7 with respect to a predetermined crown shape can be reduced to some extent while removing the influence of the physical property value change, temperature change, etc. of the rubber material 2.

  However, as described above, when the feedback gain is increased in order to further reduce the shape error, the shape error may increase. This is a phase in the feedback loop caused by a detection time delay h defined as the time from when the rubber roller 7 is pushed out from the outlet 3a of the crosshead 3 until the outer diameter is measured by the outer diameter measuring device 11. This is due to a delay.

  Therefore, a feed forward (FF) control system is adopted in the extrusion molding machine 100 according to the present invention. The FF controller 19a receives the target value m, which is an outer diameter target value from the target outer diameter generator 15a, and outputs an FF controller output v. Here, as the FF controller 19a, for example, a lead lag filter can be used.

  The FF controller output v is added to the FB controller output u output from the FB controller 17 by the adder in the previous stage of the driver 18 and transmitted to the driver 18. In the present embodiment, a command value for the feed speed of the core 1 corresponding to the target value m is output from the FF controller 19a as the FF controller output v. The FF controller output v is set so that the reference input r and the outer diameter measurement value z coincide with each other, that is, the outer diameter error e which is the difference between the reference input r and the outer diameter measurement value z is reduced. Then, the correction is made by the FB controller output u from the FB controller 17.

  For this reason, even if the operation of the FB controller 17 is delayed due to the limit of the feedback gain, the FF controller output v is transmitted to the driver 18 without passing through the slow FB controller 17. The feed speed of the core bar 1 can be directly adjusted via the driver 18 by the FF controller output v.

  In FIG. 2, the numerical simulation result which shows the performance of the extrusion molding machine 100 of this invention is shown. The upper row is a waveform overlay of the reference input r and the outer diameter measurement value z. Since four rubber rollers 7 are pushed out in about 20 seconds, four crown shapes appear. The lower row shows a waveform of an outer diameter error e which is a difference between the reference input r and the outer diameter measurement value z. The maximum outer diameter error is about ± 20 μm, which is almost symmetrical, and it can be seen that the shape error of the rubber roller 7 can be sufficiently reduced.

  Since the outer diameter measurement value z has a detection time delay, the operation of the FB control system is preferably delayed in time or position with respect to the operation of the FF control system. That is, in order to make both the FB control system and the FF control system work more effectively, FIG. 2 shows the results including not only the FF controller 19a but also the following components and operations. This will be described in more detail below.

  The outer diameter of the rubber is finally determined when it passes through the molding section 12a slightly upstream from the outlet 3a. However, since the outer diameter measuring instrument 11 is installed on the measuring section 12b separated by about 10 mm from the outlet 3a, An outer diameter measurement value z that is delayed is detected. This detection time delay h can be calculated as h = d0 / w where d0 is the distance between the forming cross section 12a and the measurement cross section 12b and w is the feed speed of the core 1.

  Therefore, the core metal speed calculator 20 calculates the feed speed w of the core metal 1 using the rotational speed from the encoder 9 as an input, and the delay time calculator 21 calculates the core calculated by the core metal speed calculator 20. Using the feed speed w of the metal 1 and the distance d0 measured in the preliminary process described later, the detection time delay h that changes every moment according to the feed speed w of the core metal 1 is calculated. Then, the reference input shifter 16a receives h as an input and outputs a reference input r obtained by delaying the target value m from the target outer diameter generator 15a by h. That is, the FB controller 17 needs to be operated in consideration of the influence of the detection time delay h. On the other hand, the FF controller 19a is not affected by the detection time delay h because it does not use the outer diameter measurement value z. Therefore, it is not necessary to delay the target value m from the target outer diameter generator 15a by h, and the target value m may be input as it is. That is, the FF controller 19a may be operated without considering the influence of the detection time delay h.

  A passing sensor 13 is attached to the take-up machine 10 that receives the rubber roller 7. The passage sensor 13 is set so as to generate a timing signal Rst at the moment when the end 1a of the core metal 1 (same as the end of the rubber roller 7) passes through the molding section 12a, and Rst is sent to the target outer diameter generator 15a. Communicated. When Rst is transmitted, the target outer diameter generator 15a outputs a time-series target value m which is the outer diameter profile of the rubber roller according to the elapsed time t. However, Rst is transmitted again and the next core bar 1 is formed. When the cross section 12a is reached, the same target value m is repeatedly output.

  The outer diameter profile of the rubber roller is not only a straight shape having the same outer diameter in the longitudinal direction of the core metal 1, but also a crown shape having a middle portion larger than both ends in the longitudinal direction of the core metal 1, It is possible to correspond to a shape having a taper. As a result, the target value m changes in the longitudinal direction of the core 1 and can be changed with time.

  By the way, the molding cross section 12a is located slightly upstream from the outlet 3a of the crosshead 3. However, it is difficult to accurately know the position of the molding cross section 12a at the stage of designing and manufacturing the extrusion molding machine 100. For this reason, it is preferable to perform a preliminary process in order to obtain the distance d0 which is the distance between the molding cross section 12a and the measurement cross section 12b prior to the mass production process in which the extrusion molding machine 100 is continuously operated.

The preliminary process may be performed by the following step response method. FIG. 3 shows step response data in the preliminary process. That is, first, the feeding speed of the core metal 1 and the feeding speed of the rubber material 2 are set to constant values, and a constant outer diameter is measured by the outer diameter measuring instrument 11. Next, the feed speed of the core metal 1 is changed stepwise from w1 to w2, and the waveform data of the measured outer diameter of the rubber roller 7 at that time is recorded. Then, it is observed that the measured outer diameter that has been constant changes from z1 to z2 with a slight delay. If the time difference Δt between the moment when the feed speed of the core metal 1 is changed stepwise and the moment when the outer diameter starts to change is measured, the distance d0 can be calculated as d0 = w2 × Δt. In practice, it is preferable to obtain a lot of data by changing the speed condition and determine the distance d0 by statistical processing.

  The distance d0 determined in this way can be used for the adjustment of the passage sensor 13, the calculation parameter of the delay time calculator 21, and the calculation parameter of the reference input shifter 16b.

  According to such a step response method, it is possible to obtain a time constant and a gain value expressing the dynamic characteristics of the core feed system and the rubber feed system. And it can utilize for the design for determining the gain coefficient of the PID filter of the FB controller 17, and the break frequency of the lead lag filter of the FF controller 19a.

With the above configuration and operation, in this embodiment, even when the feedback gain cannot be increased due to the detection time delay h in the outer diameter measuring instrument 11, the shape error of the rubber roller 7 can be sufficiently reduced.
(Second Embodiment)
FIG. 4 is a schematic configuration diagram of a rubber roller extrusion molding machine 100 according to the second embodiment of the present invention. The extrusion molding machine 100 according to the present embodiment has the same configuration and the performance of reducing the shape error as those described below in common with the extrusion molding machine 100 according to the first embodiment.

  In the present embodiment, the mandrel position calculator 22 receives the rotational speed or angle from the encoder 9 as an input, calculates the longitudinal position x of the mandrel 1, and transmits it to the target outer diameter generator 15b. The passage sensor 13 is set so as to generate the timing signal Rst at the moment when the end 1a of the core 1 (same as the end of the rubber roller 7) passes through the molding cross section 12a. Used to reset the calculated value of the longitudinal position x of the core 1 to zero.

  In the target outer diameter generator 15b, the outer diameter profile of the rubber roller 7 with respect to the longitudinal position x of the core bar 1 is stored as a numerical table, and the longitudinal position x of the core bar 1 currently passing through the molding section 12a. Is repeatedly output as a time-series target value m.

  It should be noted that the longitudinal position of the core 1 that is currently passing through the measurement section 12b is not x but x-d0. In the first embodiment, it has been described that the outer diameter measurement value z that is delayed in time is detected. However, in the present embodiment, it is reconsidered that the outer diameter measurement value z that is displaced in position is detected. Then, the reference input shifter 16b outputs the outer diameter value corresponding to the longitudinal position x of the core bar 1 currently passing through the forming section 12a, which is output from the target outer diameter generator 15b, as a distance d0. The reference input r shifted by a certain amount is output and transmitted to the FB controller 17. That is, the FB controller 17 needs to be operated in consideration of the influence of the distance d0. In contrast, the FF controller 19a is not affected by the position shift because it does not use the outer diameter measurement value z. Therefore, it is not necessary to shift the target value m from the target outer diameter generator 15a by the distance d0, and the target value m may be input as it is. That is, the FF controller 19a does not need to be operated in consideration of the influence of the distance d0.

With the above configuration and operation, in this embodiment, even when the feedback gain cannot be increased due to the detection time delay h in the outer diameter measuring instrument 11, the shape error of the rubber roller 7 can be sufficiently reduced.
(Third embodiment)
FIG. 5 is a schematic configuration diagram of a rubber roller extrusion molding machine 100 according to the third embodiment of the present invention. The extrusion molding machine 100 according to the present embodiment has a configuration other than the following and the ability to reduce shape errors in common with the extrusion molding machine 100 according to the second embodiment.

  In the present embodiment, the FF controller 19b stores the feed rate corresponding to the longitudinal position x of the core bar 1 as a numerical table, and the longitudinal position of the core bar 1 that is currently passing through the molding section 12a. The feed speed command value corresponding to x is repeatedly output as the time-series FF controller output v.

  Also in this case, the FB controller 17 performs an operation shifted by d0 in position, whereas the FF controller 19b does not need to be operated in consideration of the influence of d0.

  With the above configuration and operation, in this embodiment, even when the feedback gain cannot be increased due to the detection time delay h in the outer diameter measuring instrument 11, the shape error of the rubber roller 7 can be sufficiently reduced.

  The present invention relates to an extrusion molding machine for rubber rollers such as charging rollers and transfer rollers used in electrophotographic apparatuses such as copying machines and laser beam printers.

DESCRIPTION OF SYMBOLS 1 Core metal 2 Rubber material 3 Cross head 4 Cylinder 5 Screw 6 Roller 7 Rubber roller 8 Servo motor 9 Encoder 10 Take-out machine 11 Outer diameter measuring device 12a Molding cross section 12b Measurement cross section 13 Pass sensors 15a, 15b Target outer diameter generators 16a, 16b Reference input shifter 17 FB controller 18 Driver 19a, 19b FF controller 20 Core metal speed calculator 21 Delay time calculator 22 Core metal position calculator 100 Extruder

Claims (9)

A core metal feed driving means for continuously feeding a plurality of core bars of a predetermined length to the cross head in the longitudinal direction of the core metal; a rubber feed drive means for feeding a molten rubber material to the cross head; A rubber roller extrusion molding machine for extruding a rubber roller covered with the rubber material from the outlet of the crosshead,
A feedforward controller that outputs a command value of the feed rate of the cored bar by the cored bar feed driving means;
An outer diameter measuring instrument that is provided near the outlet of the crosshead, measures the outer diameter of the rubber roller pushed out from the outlet of the crosshead, and outputs the measured outer diameter;
A reference input shifter for outputting a reference input obtained by shifting a predetermined outer diameter target value of the rubber roller;
A feedback controller that corrects a command value of the feed rate of the core metal output from the feedforward controller so that the outer diameter measurement value of the rubber roller matches the reference input; Rubber roller extrusion machine. A cored bar speed calculator for calculating the feed rate of the cored bar by the cored bar feed driving means;
A delay time that changes in accordance with the feed speed of the core metal, and calculates a detection time delay that is a time from when the rubber roller is pushed out from the outlet of the crosshead to when the outer diameter is measured by the outer diameter measuring instrument. A calculator, and
The reference input shifter outputs the reference input obtained by shifting the outer diameter target value by the detection time delay based on the detection time delay calculated by the delay time calculator. 2. A rubber roller extrusion molding machine according to 1.   The delay time calculator is configured to calculate the core metal speed when a distance d0 between a molding cross section in which the outer diameter of the rubber roller is determined and a measurement cross section in which the outer diameter of the rubber roller is measured by the outer diameter measuring instrument. The rubber roller extrusion molding machine according to claim 2, wherein the detection time delay is calculated by using the feed rate of the core metal calculated by a container and the distance d0. A metal core position calculator for calculating a longitudinal position of the metal core;
The reference input shifter is configured to shift the reference value of the outer diameter in the longitudinal direction of the metal core based on the position in the longitudinal direction of the metal core calculated by the metal core position calculator. 2. The rubber roller extrusion molding machine according to claim 1, which outputs an input.   The reference input shift device has the outer diameter target value when a distance d0 between a molding cross section in which the outer diameter of the rubber roller is determined and a measurement cross section in which the outer diameter of the rubber roller is measured by the outer diameter measuring device. 5. The rubber roller extrusion molding machine according to claim 4, wherein the reference input is output by shifting the position in the longitudinal direction of the core bar by the distance d <b> 0.   6. The feedforward controller according to claim 1, wherein the outer diameter target value is input, and a command value of the feed rate of the core metal corresponding to the input outer diameter target value is output. The rubber roller extrusion molding machine described.   The feedforward controller receives the position in the longitudinal direction of the cored bar calculated by the cored bar position calculator, and determines the feed rate of the cored bar corresponding to the input position in the longitudinal direction of the cored bar. 6. The rubber roller extrusion molding machine according to claim 4, which outputs a command value. The distance d0 is obtained in a preliminary process performed prior to the mass production process in which the extrusion molding machine is continuously operated.
The preliminary process includes
A step of setting the feed speed of the rubber material by the rubber feed drive means to a constant value, setting the feed speed of the core metal by the core metal feed drive means to a constant value, and setting the outer diameter of the rubber roller to a constant value;
Recording waveform data of the outer diameter measurement value of the rubber roller when the feed rate of the cored bar is changed stepwise from w1 to w2,
Calculating a time difference Δt between the moment when the feed rate of the metal core is changed stepwise and the moment when the outer diameter measurement value starts to change;
Calculating the distance d0 by d0 = w2 × Δt;
A rubber roller extrusion molding machine according to claim 3 or 5, comprising: A core metal feed driving means for continuously feeding a plurality of core bars of a predetermined length to the cross head in the longitudinal direction of the core metal; a rubber feed drive means for feeding a molten rubber material to the cross head; A rubber roller produced by an extrusion molding machine that extrudes a rubber roller covered with the rubber material from the outlet of the crosshead.
Output a command value of the feed rate of the cored bar by the cored bar feed driving means,
Measure the outer diameter of the rubber roller extruded from the outlet of the crosshead,
Output a reference input by shifting a predetermined outer diameter target value of the rubber roller,
A method of manufacturing a rubber roller, comprising: correcting a command value of the feed rate of the core bar so that the outer diameter measurement value of the rubber roller matches the reference input.

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