JP2004360827A - Belt drive for double belt machine and double belt machine with same drive - Google Patents

Abstract

A highly reliable upper and lower belt synchronous driving device for a double belt machine, which does not cause unevenness in physical properties or deformation due to the presence of a friction member even when machining is performed for a long time under the same conditions, To provide a high double belt machine.
An upper and lower metal endless belt (101, 102), which is wound around a pair of drive drums and driven drums arranged vertically and rotates, respectively, has a single drive source (107). Each drum shaft (109, 110) of the belt drive drum (103a, 103b) is transmitted and driven via a sprocket (111-114). At this time, one of the drum shafts (109, 110) of the belt driving drums (103a, 103b) arranged vertically and the corresponding sprocket are connected via a friction member (115).
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is applied to a double belt machine that performs all processes such as heating, pressurizing, and cooling while being transported by being sandwiched between a pair of upper and lower metal endless belts stretched between two or more drums. The present invention relates to a synchronous drive device for both endless belts using a single drive source, and a double belt machine provided with the drive device.
[0002]
[Prior art]
Machines using metal endless belts have been used in the past, for example, coating machines, film forming machines, electronic component manufacturing machines, synthetic resin polymerization machines, sheet pasting machines, various resins, chemicals, foods, etc. It is used in various fields such as cooling, solidifying, and granulating machines. These processing and manufacturing machines are often simply referred to as belt machines. These belt machines use a single metal endless belt, a single belt machine that performs desired processing on a workpiece on the same endless belt running in one direction, and a pair of upper and lower metal endless belts. There is a double belt machine that performs various types of processing on a workpiece between upper and lower endless belts running in the same direction using the same.
[0003]
Among such belt machines, especially double belt machines are used to transport various resins, rubbers, or composite sheets or boards between the running upper and lower belts while simultaneously performing heating / cooling, pressurization / lamination, mirror transfer, and the like. Various processes such as heat treatment, molding and lamination are continuously performed. For example, Patent Literature 1 discloses a metal endless belt in which an inlet sheet in which an IC chip is mounted on a coil antenna is interposed between card base materials, and a work W is vertically arranged and runs in one direction in a counter belt region. There is disclosed a double belt machine that manufactures a resin card with a built-in IC chip by holding it between and heating it with a heating / pressing device, then pressurizing and cooling it. Further, in Patent Document 2, for example, two or more sets of a pair of metal endless belts running in the same direction and at the same speed are installed in series, and the unfoamed resin sheet is pressed and transported by the pair of belts while the temperature condition is maintained. A method for continuously producing a foamed sheet having uniform air bubbles through a plurality of sets of upper and lower belts having different configurations is disclosed.
[0004]
[Patent Document 1]
JP-A-11-338997 [Patent Document 2]
Japanese Patent Application Laid-Open No. 8-156119
[Problems to be solved by the invention]
In this type of double belt machine, for example, unlike the above-mentioned single belt machine, the vertical combination of endless belts and rolls, and the processing machine using upper and lower rolls, the most advantageous point is the speed between the upper and lower belts. As long as there is no difference, it is possible to perform various processing evenly between the front and back while the workpiece is sandwiched and transported between the belts running up and down, that is, for example, in the processing of a continuous sheet, the sheet The same transfer force acts on the front and back surfaces of the sheet-like material even if continuous processing is performed while transferring the objects synchronously while regulating the distance between the front and back surfaces of the sheet, unless there is a speed difference between the upper and lower belts. In addition, since no bending or tensile force acts on the sheet-like material, there is no processing unevenness or deformation unevenness that is likely to occur between the front and back surfaces of the workpiece, and as a result, the finished product has physical properties Also Processing of high-yield high-quality quality is that it is possible.
[0006]
The good yield depends on how accurately the synchronous driving of the upper and lower endless belts can be performed. For driving a conventional double belt machine, such a high-precision synchronous drive is intended, for example, the upper and lower belt drive drums are individually driven independently with a servo motor as a drive source, respectively, or with high precision. Using a machined chain and sprockets, a single servo motor drives the upper and lower belt drive drums simultaneously.
[0007]
When the upper and lower belt drive drums are independently driven by independent servo motors, for example, to change or control the processing conditions according to the sequence, it is advantageous in terms of its responsiveness and quick and accurate switching. However, independently controlling the upper and lower belt driving drums independently under the same conditions for a long time is not advantageous in terms of cost and maintenance. On the other hand, the method of synchronously driving a plurality of belt driving drums via a chain and a sprocket using one single driving source is advantageous when a plurality of driving systems are synchronously driven for a long time, It is considered to be suitable for the double belt machine as described above, and has conventionally been generally employed.
[0008]
However, even if it is a normal operation, even if it is a double belt machine, there is not much problem, but in the case of a double belt machine using a pair of metal endless belts requiring high precision processing as described above, Even with the chain drive by a single drive source that is considered to be highly reliable as described above, the cause is not exactly grasped, but no matter how high precision machined equipment or members are used In particular, it is difficult to completely match the dimensions of the upper and lower driving drums that directly drive the belt. Therefore, a shift, which is considered to be based on the speed difference between the upper and lower belts, occurs on the front and back surfaces of the workpiece, for example, the continuous sheet, and wrinkles may be generated on any of the front and back surfaces of the continuous sheet.
[0009]
The present inventors have repeated many trials and errors in order to solve the above-mentioned problems, and then, despite the simple mechanism, do not cause a shift between the front and back of the workpiece, and have a desired high quality. The present invention has reached the present invention in which synchronous driving of the upper and lower endless belts made of metal from which a product is obtained can be effectively exerted.
[0010]
That is, without directly fixing the sprocket disposed on one of the upper and lower belt driving drums of the double belt machine to the same driving shaft, the sprocket is disposed between the driving shaft and the sprocket. By interposing a frictional member between the upper and lower belts, the friction between the upper and lower belts between the workpiece and the respective belts, or between various drums such as a drive drum, a driven drum, and a belt pressing roll, and the like. Resistance, or temperature fluctuations of the upper and lower belts, dimensional differences between the upper and lower driving and driven drums, and various factors such as a difference in tension between the upper and lower belts, when a slight speed difference is caused between the upper and lower belt drums, By causing a slight slip between the drive drum and the sprocket via the friction member, the speed difference between the upper and lower drive drums is instantaneously absorbed, and the front and back surfaces of the workpiece are When driven in synchronization, it was found that a high-quality product was obtained in which no transfer deviation occurred between the front and back surfaces of the workpiece, and no deformation spots or physical property spots such as wrinkles were obtained. Things.
[0011]
The present invention has been made in order to solve such problems as described above, and a specific object is that even if processing is performed for a long time under the same conditions by a double belt machine, physical property unevenness and deformation unevenness do not occur. An object of the present invention is to provide a highly reliable synchronous driving device for upper and lower belts and a highly reliable double belt machine employing the same.
[0012]
Means for Solving the Problems and Functions and Effects
As described below, the belt driving device of the present invention is preferably applied to a double belt machine that performs various types of processing between upper and lower endless belts made of metal, which require particularly high-precision processing, as described below. Productivity is significantly improved by the double belt machine employing the same drive device.
[0013]
The basic configuration of the device of the present invention is such that various processes such as heating, pressurizing, and cooling are continuously performed between a pair of upper and lower belts facing each other. Endless belt driving device of a double belt machine provided with a pair of metal endless belts, a single drive source, and the same drive source and the drum shaft of each belt drive drum arranged vertically. And an endless chain that transmits and drives via each sprocket, and one of the drum shafts of the belt drive drums arranged vertically and a corresponding sprocket are connected via a friction member. It is in the belt drive for double belt machines.
[0014]
As a typical mode of the belt drive device for a double belt machine according to the present invention, a first drive unit in which a drum shaft of the drive drum coupled via the friction member rotates integrally with the drum shaft. A rotating disk, a second rotating disk integrated with the drum shaft like the first rotating disk, and rotating between the first disk and the second disk; Having the above-mentioned sprocket capable of free rotation on a shaft, wherein the friction member is constituted by a friction disk closely arranged between the first and second rotating disks and the sprocket; Is preferred. At this time, it is preferable that the friction disk is fixed to both surfaces of the sprocket by a fixing means such as an adhesive or a screw. Further, a friction member may be further interposed between the drum shaft and the sprocket.
[0015]
By mounting the belt driving device having the above-described configuration on the double belt machine, the driving of the upper and lower metal endless belts is automatically corrected, and the synchronous driving with high precision is always performed. For example, when there is a processing error in the outer dimensions of the vertical driving drum or the vertical driven drum, and a speed difference is likely to occur between the running speeds of the upper and lower belts, the rotating upper and lower belts are sandwiched between the upper and lower belts. If the frictional resistance between the upper and lower belts and the upper and lower belts and the upper and lower drive drums respectively laid on the upper and lower belts are large, the friction between the upper and lower belts and the workpiece is large. No slippage occurs between the upper and lower belts and the upper and lower drive drums, and slippage occurs between one of the drive drums and the sprocket via the friction member, so that automatic synchronization is achieved. As a result, there is no shift based on the speed difference between the front and back surfaces of the workpiece to be processed between the upper and lower belts, and there is no variation in the quality of the processed product. Greatly improve the performance.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a typical embodiment of a double belt machine to which a drive device for a metal endless belt composed of a pair of upper and lower parts of the present invention is applied will be specifically described with reference to the drawings. FIG. 1 shows a schematic configuration of a continuous machine for optical film, which is one type of the belt machine, and FIG. 2 schematically shows an outline of an upper and lower belt driving device applied to the continuous machine. I have.
[0017]
The belt machine in the present embodiment is a continuous optical film manufacturing machine 100 using a pair of upper and lower metal endless belts 101 and 102 that have been subjected to ultra-mirror finishing with high thickness accuracy in the belt width direction. The pair of upper and lower metal endless belts 101 and 102 are wound around a pair of driving drums 103a and driven drums 104a disposed above and a pair of driving drums 103b and driven drums 104b disposed below, respectively. In the area where the belts 101 and 102 face each other, the belts 101 are positively driven in one direction from the driven side to the driving side.
[0018]
The metal endless belt 101 to be attached to the optical film continuous manufacturing machine 100 is a stainless steel belt having a thickness of 1.5 mm and a belt width of 3 m, both surfaces of which are super mirror-finished. The belt speed is 10 m / min, the heating temperature can be adjusted up to 400 ° C., the cooling temperature can be adjusted to 40 ° C. or less, and the pressure can be adjusted up to 10 MPa.
[0019]
For this reason, in the illustrated example, a plurality of pairs of heating / pressing rolls 105 and 106 are arranged in a row on the inner surface of the facing area of the upper and lower metal endless belts 101 and 102 which are running. These heating and pressing rolls 105 and 106 can be heated at a high temperature, are controlled to a required heat generation temperature with high precision, and have a structure capable of uniformizing the temperature distribution on the roll surface with high precision.
[0020]
The optical film continuous manufacturing machine 100 according to the illustrated example includes a lower endless belt 102 in which an acrylic resin raw material before polymerization whose supply amount is controlled with high precision via a measuring pump (not shown) is driven by a lower driving drum 103b. And is introduced between upper and lower metal endless belts 101 and 102 driven by upper and lower drive drums 103a and 103b, and is transferred in one direction between belts in a belt facing area. An optical film having a uniform thickness in the length direction and the width direction is produced while being polymerized by being heated and pressed at a temperature of ° C., and is continuously fed from a belt end on the drive drum 103a, 103b side by a take-off roll (not shown). The product is taken over.
[0021]
The drive drums 103a and 103b for driving the upper and lower metal endless belts 101 and 102 according to the present embodiment are synchronously driven by a single drive motor 107 and a single chain 108 (not shown) as shown in FIG. Is done. Therefore, sprockets 111 to 113 are attached to the shaft ends of the drum shafts 109 and 110 of the upper and lower drive drums 103a and 103b and the output shaft of the drive motor 107, respectively. Further, an idler sprocket 114 is provided in a part of the drive system.
[0022]
Further, in this embodiment, the sprockets 111, 112 attached to one of the drum shafts 109, 110 of the drive drum pairs 103a, 103b are the corresponding drum shafts 109, 110. , A friction member 115 is interposed between one of the drum shafts 109, 110 and the corresponding sprocket 111, 112. Within the belt driving force set in advance by the drums 103a and 103b, the power of one of the sprockets 111 and 112 is reliably applied to the drum shaft 109 or 110 to which the friction member 115 is attached via the friction member 115. Although transmitted to the upper drum shaft 109 or the lower drum shaft 110, a speed difference is generated between the upper and lower metal endless belts 101 and 102 due to, for example, a difference in the outer dimensions of the drums 103a and 103b. For this reason, a tension greater than or equal to a preset belt driving force is applied to one endless belt 101 or 102 from each of the driving drums 103a or 103b, or is reduced to a tension less than or equal to the belt driving force.
[0023]
When the fluctuation of the tension reaches a condition where a difference occurs in the rotational speed between the upper and lower driving drums 103a and 103b, and a speed difference between the two endless belts 101 and 102 is likely to occur, the friction is reduced. A slip occurs between the member 115 and the sprockets 111 and 112, and the drive drum 103a (103b) on the side to which the friction member 115 is attached follows and at the same speed as the other drive drum 103b (103a). It comes to rotate.
[0024]
As a result, since the belts are driven synchronously without causing a slight speed difference between the upper and lower metal endless belts 101 and 102, a slight transfer between the vertically arranged laminates is particularly performed as in the present embodiment. When high-precision processing that does not allow a difference is required, no processing unevenness occurs between the front and back sheets and the film, and an extremely high-quality product can be manufactured with high yield.
[0025]
FIGS. 3 and 4 show a specific configuration example of the drum shaft portion provided with the friction member 115 of the present invention. In this specific example, the friction member 115 is provided between the sprocket 112 and the drum shaft 110 of the lower drive drum 103b. In the present invention, of course, the friction member 115 can be interposed between the drum shaft 109 of the upper drive drum 103a and the sprocket 111 without being interposed on the lower drum shaft 110 side. In these drawings, members corresponding to members used in the driving device shown in FIG. 2 are denoted by the same reference numerals.
[0026]
As described above, the cause of the speed difference between the running speeds of the upper and lower metal endless belts in this type of double belt machine is slippage between the drive belt and the belt drive drum, and the upper and lower belt tensions are not correct. Balance, difference in frictional force between the upper and lower belts and the workpiece, temperature difference between the upper and lower belts, etc. A major factor is usually a dimensional difference between the upper and lower drive drums 103a and 103b for driving and guiding the upper and lower endless belts 101 and 102 and the driven drums 104a and 104b.
[0027]
These drums 103a, 103b, 104a, and 104b are also manufactured with extremely high dimensional accuracy at the time of their manufacture, but errors are inevitably generated, albeit slightly. As a result, when the continuous production machine 100 for optical films, which is a double-belt machine, is operated, a slight amount of space is formed between the upper and lower endless belts 101 and 102 based on the dimensional difference between the drums 103a, 103b, 104a and 104b. A transfer difference between the upper and lower endless belts 101 and 102 with respect to the workpiece is generated based on the speed difference, and the above-described shift occurs on the front and back surfaces of the workpiece.
[0028]
The effect of the dimensional difference between the drums 103a, 103b, 104a, and 104b is caused by the test operation after setting the drums 103a, 103b, 104a, and 104b on the machine and performing various adjustments with other devices and members. It turns out for the first time. In this embodiment, the running speed of the endless belt 102 wrapped around the lower drive drum 103b and the driven drum 104b with time over this test operation was wrapped around the upper drive drum 103a and the driven drum 104a. It has been found that the running speed of the endless belt 101 tends to be higher. Therefore, in the present embodiment, a friction member 115 is interposed between the drum shaft 110 of the lower drive drum 103b and the sprocket 112 mounted on the drum shaft 110 as follows.
[0029]
At the shaft end of the lower drum shaft 110, a flanged cylindrical body 116 fitted to the drum shaft 110 is fixed in the rotational direction by key connection, and the axial positioning of the drum shaft 110 is performed by a set screw (not shown). It is positioned and fixed at a predetermined position. The sprocket 112 is fitted to the cylindrical portion 116a of the flanged cylinder 116, and one surface of the sprocket 112 is brought into contact with the flange 116b of the flanged cylinder 116 via the first friction member 115a. It is arranged in.
[0030]
Further, on the other surface of the sprocket 112, a donut-shaped disc 117 is disposed so as to be in contact with the cylindrical portion 116a through the second friction member 115b through the cylindrical portion 116a. The surface is pressed by a holding disc 119 disposed via a spring washer 118, and presses the donut-shaped disc 117 against the flange portion 116b side of the cylindrical body 116 with the flange. The donut-shaped disk 117 has five screw holes 117a formed in a peripheral portion thereof. A bolt / nut 122 is screwed into the screw hole 117a, and the holding disk 119 is connected to the dowel-shaped disk 117 via the spring washer 118. And is pressed and fixed by the donut-shaped disk 117. The pressing force is adjusted by the screwing amount of the bolt / nut 122.
[0031]
In this embodiment, the first and second friction members 115a and 115b are made of a donut-shaped sintered metal friction disk, and are integrally attached to the front and rear surfaces of the sprocket 112 with a thermosetting adhesive or the like. Has been Of course, it is also possible to attach and integrate the flange portion 116b and the donut-shaped disk 117 on the respective opposing surfaces. Further, in addition to the bonding by the adhesive, it can be fixed and integrated by a screw or the like. Further, as the material of the friction member 115, in addition to the above-described sintered metal, a friction material in which glass fiber, asbestos, or the like is integrated with a heat-resistant resin, or a friction material made of a ceramic made of an inorganic material is used. Can be.
[0032]
An external thread 116c is cut on the end surface of the cylindrical portion 116a of the flanged cylindrical body 116, and a narrow groove 116d parallel to the axis is formed. The pressing force of the presser disc 119 is adjusted by the amount of tightening of the nut 121 which is tightened into the outer screw 116c via the chrysant washer 120. The valve portion 120a of the chrysanthemum washer 120 is fitted in the narrow groove 116d, and the chrysanthemum washer 120 is moved along the axis of the cylindrical portion 116a based on the tightening amount of the nut 121 and the urging force of the spring washer 118. Let it.
[0033]
The pressing force of the donut-shaped disk 117 via the spring washer 118 on the first and second friction members 115a and 115b of the sprocket 112 according to the tightening amount of the nut 121 is a table of the workpiece collected during the test operation. It is determined by the transmission force transmitted to the drum shaft 110 via the friction members 115a and 115b when the rear surface is displaced. At the same time, the drive of the drive motor 107 is adjusted in advance to a suitable drive speed that minimizes the speed difference generated between the upper and lower endless belts 101 and 102 based on the dimensional difference of the drive drum and the like.
[0034]
Now, on the sprocket 112 of the lower drive drum 103b having the above configuration, a single chain 108 hung on a sprocket 113 fixed to the output shaft of the drive motor 107 is provided to the upper drive drum 103a and the drive system. The driving force of the driving motor 107 is transmitted to the upper and lower driving drums 103a and 103b, and the upper and lower driving drums 103a and 103b are driven synchronously.
[0035]
Now, in the present embodiment, the size of the upper drive drum 103a is slightly smaller than the size of the lower drive drum 103b, and the traveling speed of the lower endless belt 102 is relatively higher than the traveling speed of the upper endless belt 101. Become larger. Before the speed difference causes a shift between the front and back of the workpiece, the lower endless belt 102 tries to return the workpiece backward by the pressing force of the upper endless belt 101. When a force is applied and the force exceeds a preset frictional force between the flanged portion 116b of the flanged cylinder 116 fixed to the lower drum shaft 110, a slip occurs there, and The running speed of the endless belt 102 is synchronized with the running speed of the upper endless belt 101.
[0036]
As a result, even when high-precision processing is required, as in the optical film manufacturing machine 100 according to the present embodiment, the traveling speed between the upper and lower endless belts 101 and 102 is applied to the surface of the workpiece. There is no speed difference enough to cause a shift, and no wrinkles or changes in physical properties occur on the surface of the obtained product, and an extremely high quality product can be obtained.
[0037]
In addition, the above description is only an example of a typical embodiment of the present invention, and the present invention is not limited to the above embodiment, for example, the friction member is bonded and integrated on both front and rear surfaces of a sprocket. However, this friction member can be integrated into the opposed surfaces of the flange of the flanged cylindrical member and the donut-shaped disc, respectively, or can be used alone or together with the above-described embodiment between the drum shaft of the drive drum and the sprocket. It is also possible to interpose, or the applicable model of the belt drive device of the present invention is not limited to the optical film production machine, but a double belt for continuous processing and processing of various sheet materials. Applicable to various processing machines such as a double belt machine that laminates and integrates multiple sheets made of different materials and structures such as machines, rubber, synthetic resins, metal foils, and nonwoven fabrics Rukoto can.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing a typical configuration example of a belt machine to which a metal endless belt according to the present invention is applied.
FIG. 2 is a configuration diagram schematically illustrating an example of a metal endless belt drive system of a double belt machine according to the present embodiment.
FIG. 3 is a side view showing an example of a connection mechanism between a drive drum shaft and a sprocket applied to the belt drive system.
4 is a cross-sectional view taken along the line IV-O in FIG. 3 and viewed from the direction of the arrow B along the line O-IV.
[Explanation of symbols]
100 Optical Film Continuous Production Machine (Double Belt Machine)
101, 102 Upper and lower metal endless belts 103a, 103b Driving drums 104a, 104b Driving drums 105, 106 Upper and lower pairs of heating / pressing rolls 107 Driving motors 108 Chains 109, 110 Upper and lower drum shafts 111 to 114 Sprockets 115, 115a, 115b Friction Member 116 Flanged cylindrical body 116a Cylindrical portion 116b Flange portion 116c External thread 116d Narrow groove 117 Donut-shaped disk 117a Screw hole 118 Spring washer 119 Holding disk 120 Kiku washer 120a Valve portion 121 Nut 122 Bolt, nut

Claims (5)

A pair of metal endless belts that wrap around and rotate around a pair of upper and lower drive drums and driven drums, and perform various processes such as heating, pressurizing, and cooling between the upper and lower belts. A drive device for an endless belt of a double belt machine having a belt,
A single drive source, and an endless chain that transmits and drives the drive source and the drum shaft of each belt drive drum arranged vertically through respective sprockets, and the belt drive arranged vertically. A belt drive device for a double belt machine, wherein one drum shaft of a drum and a corresponding sprocket are connected via a friction member. A drum shaft of the drive drum coupled via the friction member, a first rotating disk that rotates integrally with the drum shaft, and a drum shaft that is integrated with the drum shaft like the first rotating disk; A second rotating disk that rotates by rotation, and the sprocket that is disposed between the first disk and the second disk and that can freely rotate on the drum shaft.
The friction member comprises a friction disk closely disposed between the first and second rotating disks and the sprocket,
The belt drive for a double belt machine according to claim 1, wherein 3. A belt driving device for a double belt machine according to claim 2, wherein said friction disks are fixed to both surfaces of said sprocket with fixing means. The belt driving device for a double belt machine according to claim 2, wherein a friction member is further interposed between the drum shaft and the sprocket. A double belt machine comprising the belt drive device according to claim 1.

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