JP2020044587A - Manufacturing method of tire sound absorbing material and slit machining device - Google Patents

Abstract

To improve yield of the tire sound absorbing material.SOLUTION: A slit machining device 20 in the present disclosure feeds a rectangular foam sheet 110 made by providing a plurality of projected lines 15 on an upper face in parallel, in an extended direction of the projected lines 15 to supply the foam sheet to a slitter 22, thereby, divides the foam sheet 110 in a sheet width direction on a valley groove 16 between the projection lines 15 themselves to provide a plurality of belt-like foam bodies. The slit machining device 20 includes a slitter blade position storage means which stores a position of the blade 23 of the slitter 22 in the sheet width direction, a valley groove center detection means which detects the center of the valley groove 16 in the sheet width direction, a deviation amount calculation means which calculates a deviation amount of the center of the valley groove 16 from the position of the blade 23 of the slitter 22 and a sheet position regulation means which moves the foam sheet 110 in the sheet width direction such that the deviation amount becomes within a prescribed value based on the deviation amount calculated by the deviation amount calculation means.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a tire sound absorbing material fixed to a tire in a tire cavity, and a slit processing apparatus used for the method.

  BACKGROUND ART Conventionally, as a tire sound absorbing material, there has been known a tire sound absorbing material which is formed of a band-shaped foam and has a ridge extending on one surface thereof in a longitudinal direction (see Patent Document 1). The tire sound-absorbing material is attached to the tire cavity by attaching the surface opposite to the ridge to the tire along the tire circumferential direction. Such a tire sound-absorbing material is supplied to a slitter by sending a rectangular foam sheet having a plurality of ridges on one side in parallel in the extending direction of the ridges, and supplying the foamed sheet with a valley groove between the ridges. Is divided (cut) in the sheet width direction.

Patent No. 4723330 (paragraphs [0015] to [0017], FIGS. 1 to 4)

  By the way, the above-mentioned rectangular foam sheet is manufactured as follows. First, the polyurethane foam is cut into a sheet, and the sheet-like foam is cut into a shape in which a plurality of ridges extend in the longitudinal direction. Next, a double-sided tape is pressure-bonded to the surface of the obtained cut material opposite to the protrusion, and the cut material is cut into a predetermined size. Thereby, a rectangular foamed sheet having a plurality of ridges on one side in parallel is obtained. In the production of the above-described tire sound-absorbing material, the foamed sheet formed in a predetermined shape may shift in the sheet width direction, expand or contract due to a plurality of manufacturing steps or due to the tension of the double-sided tape. When they are stacked, the location where the foam sheet is cut is shifted, and as a result, there is a problem that a defective product in which the arrangement of the ridges is significantly shifted in the band-shaped foam is generated. For this reason, improvement in the yield of the tire sound absorbing material is required.

  The invention of claim 1 made in order to solve the above-mentioned problem is used for manufacturing a tire sound-absorbing material composed of a band-shaped foam and fixed to a tire in a tire lumen, and a plurality of ridges are arranged in parallel on one side. By feeding the rectangular foam sheet provided in the slitter with the ridges facing upward in the extending direction of the ridges and supplying the slitter with the ridges, the foam sheet is formed in the valley grooves between the ridges. A slit processing apparatus that obtains a plurality of the band-shaped foams by dividing in the sheet width direction, wherein the slitter blade position storage unit that stores a position of the slitter blade in the sheet width direction, and the slitter in the sheet width direction. A valley groove center detecting means for detecting the center of the valley groove, the center of the valley groove detected by the valley groove center detecting means and the position of the slitter blade stored in the slitter blade position storage means. A shift amount calculating unit that calculates a shift amount of the center of the valley groove from the position of the slitter blade based on the shift amount, and the shift amount is set in advance based on the shift amount calculated by the shift amount calculating unit. And a sheet position adjusting means for moving the foamed sheet in the sheet width direction so as to be within the specified value.

  The invention according to claim 2 has a camera that images the valley groove from directly above, and the valley groove center detection unit detects the center of the valley groove from an image of the camera that has captured the valley groove. Item 2. A slit processing device according to item 1.

  According to a third aspect of the present invention, there is provided the slit processing apparatus according to the second aspect, further comprising an illumination unit that illuminates the periphery of the valley groove.

  The invention according to claim 4, further comprising a laser device that irradiates a laser beam in a feeding direction of the foam sheet and hits the blade of the slitter, wherein the slitter blade position storage unit captures an image of the camera that captures the laser beam. The slit processing apparatus according to claim 2, wherein a position of the laser beam is detected from the position information, and the position is stored as a position of a blade of the slitter.

  The invention according to claim 5, wherein the plurality of cameras are arranged right above a plurality of locations on the foam sheet, and the displacement amount calculating means calculates an average of the displacement amounts at the plurality of locations on the foam sheet. The slit processing device according to any one of claims 2 to 4, wherein the sheet position adjusting means moves the foamed sheet so that the average of the shift amount is within the specified value.

  The invention according to claim 6, wherein a plurality of feed guides extending in the feed direction of the foam sheet and entering the valley grooves are provided in the sheet width direction, and the sheet position adjusting means adjusts the feed guide to the sheet width. The slit processing apparatus according to any one of claims 1 to 5, wherein the slit processing apparatus is moved in a direction.

  The invention according to claim 7, wherein the feed guide is in contact with one of the two ridges sandwiching the valley groove, and has a gap between the feed guide and the bottom of the valley groove. It is a slit processing device.

  The invention according to claim 8 is the slit processing apparatus according to claim 6 or 7, wherein the sheet position adjusting means moves the feed guide in the sheet width direction by an electric slider.

  The slit processing according to any one of claims 1 to 8, wherein the slitter blade is formed in a disk shape and attached to a support shaft extending in the sheet width direction. Device.

  A tenth aspect of the present invention is a method for manufacturing a tire sound absorbing material, wherein the tire sound absorbing material is manufactured using the slit processing apparatus according to any one of the first to ninth aspects.

[Inventions of claims 1 to 5, 9, and 10]
According to the first and tenth aspects of the present invention, the shift amount between the center of the valley groove in the foam sheet and the position of the slitter blade is calculated, and the position of the foam sheet is adjusted based on the shift amount. Thereby, in the band-like foam obtained from the foam sheet, the position of the ridge in the width direction is stabilized, and the yield of the tire sound absorbing material is improved.

  Note that the center of the valley groove may be detected from an image of the camera by using a camera that images the valley groove from directly above (the invention of claim 2). In addition, if an illuminating unit that shines light around the valley groove is provided, the image of the camera is suppressed from being darkened, and the center of the valley groove is easily detected (the invention of claim 3).

  In addition, the position of the slitter blade is determined by irradiating a laser beam in the feeding direction of the foamed sheet, irradiating the slitter blade, detecting the position of the laser beam from the image of the camera that captured the laser beam, and slitting the detected position. The position of the blade. According to this configuration, it is possible to accurately determine the deviation between the center of the valley groove and the position of the slitter blade from the image of the camera when the valley groove is imaged (the invention of claim 4).

  In addition, a camera is provided directly above a plurality of locations of the foam sheet, and the average of the amount of displacement at the plurality of locations is within a specified value, so that the center of the valley groove and the slitter over the entire foam sheet are provided. It is possible to reduce the amount of deviation from the blade (the invention of claim 5).

  The slitter blade is formed in a disk shape and attached to a support shaft extending in the sheet width direction, so that the position of the slitter blade can be easily changed. This makes it possible to obtain a band-like foam from a foam sheet having different lengths of valleys and ridges in the sheet width direction (the invention of claim 9).

[Inventions of claims 6 to 8]
In moving the foam sheet in the sheet width direction, the foam sheet may be pushed or pulled from one side in the sheet width direction, or may be configured to have a belt or a roller below the foam sheet, or may be a foam sheet. It is also possible to provide a plurality of feed guides which extend in the feed direction and enter the valley grooves, and the feed guides are moved in the sheet width direction (the invention of claim 6). According to the configuration including the feed guide, the foam guide can be guided in the feed direction by the feed guide, and the movement in the sheet width direction can be suppressed.

  Here, if the feed guide is configured to be in contact with one of the two ridges sandwiching the valley groove and to have a gap with the bottom of the valley groove, a plurality of types having different shapes and sizes of the valley groove are provided. Can be handled by one type of feed guide (the invention of claim 7).

  If the feed guide is moved by the electric slider, the movement accuracy of the feed guide can be improved (the invention of claim 8).

(A) Perspective view and (B) sectional view of a tire sound absorbing material according to an embodiment of the present disclosure. (A) Side sectional view of a tire sound-absorbing material mounted in a tire lumen, (B) Cross-sectional view cut at one location in the tire circumferential direction Schematic configuration diagram of slit processing device Sectional view of slit processing machine cut in sheet feeding direction Block diagram of slit processing equipment Flow chart of slit processing Top view of a laser device that applies laser light to the slitter blade (A) Image of laser beam applied to slitter blade, (B) Image of valley groove

  As shown in FIG. 1A, the tire sound-absorbing material 10 according to the present embodiment is configured by a band-shaped foam 11. On the surface on the front side of the tire sound-absorbing material 10, a ridge 15 extending in the longitudinal direction of the tire sound-absorbing material 10 is provided. The ridge 15 is arranged so as to avoid the edge in the width direction of the tire sound absorbing material 10, and the ridge 15 has a trapezoidal cross-sectional shape (see FIG. 1B). In the tire sound absorbing material 10 of the present embodiment, a plurality of ridges 15 are provided, and a valley groove 16 is formed between the ridges 15.

  As shown in FIGS. 2A and 2B, the tire sound absorbing material 10 is mounted in a tire cavity 90 formed between a tire 91 and a rim 92. Specifically, the tire sound-absorbing material 10 is disposed so as to extend along the circumferential direction of the tire 91 in the tire lumen 90, and the back surface of the tire sound-absorbing material 10 is attached to the rim-facing surface 91 </ b> M of the tire 91. Can be Note that a double-sided tape may be attached to the back surface of the tire sound absorbing material 10. In this case, a release film is attached to the surface of the double-sided tape facing the side opposite to the tire sound absorbing material 10.

  The band-shaped foam 11 constituting the tire sound absorbing material 10 is obtained by dividing the foam sheet 110 shown in FIG. The foam sheet 110 has a rectangular shape in a plan view, and a plurality of protrusions 15 extending in the longitudinal direction are provided in parallel on one surface of the foam sheet 110. Then, one foam sheet 110 is divided by the valley grooves 16 into a plurality of band-shaped foams 11, whereby a plurality of tire sound absorbing materials 10 are manufactured at one time.

  The slit processing device 20 is used for dividing the foam sheet 110. The slitting device 20 includes a slitter 22 for dividing the foamed sheet 110 in a sheet width direction (that is, a short direction of the foamed sheet 110), and a sheet conveying device 21 for feeding the foamed sheet 110 to the slitter 22. Have. Hereinafter, the feeding direction of the sheet conveying device 21 is referred to as a “sheet feeding direction”.

  The sheet conveying device 21 includes a sheet mounting portion 21R on which the foam sheet 110 is mounted, a conveying belt or a conveying roller that contacts the lower surface of the foam sheet 110 mounted on the sheet mounting portion 21R, and the conveying belt or And a transport motor 21K (see FIG. 5) for rotating the transport rollers. The foam sheet 110 is arranged such that the extending direction of the ridge 15 is the sheet feeding direction with the ridge 15 facing upward. Then, when the transport belt or the transport roller is driven to rotate by the transport motor 21K, the foam sheet 110 placed on the sheet placing portion 21R is transported toward the slitter 22 as shown by an arrow in FIG. Is done.

  A pair of guide walls 25, 25 are provided on the upper surface of the sheet conveying device 21 to restrict the falling of the foam sheet 110 from the sheet mounting portion 21R with the sheet mounting portion 21R sandwiched in the sheet width direction. In addition, a support frame 26 (see FIG. 4) that covers the sheet placement unit 21 </ b> R from both sides and the upper side in the sheet width direction is attached to an upper portion of the sheet conveying device 21.

  In the present embodiment, the conveyance belt or the conveyance roller is also arranged on the upstream side in the sheet feeding direction with respect to the sheet placement unit 21R, and the placement of the foam sheet 110 on the sheet placement unit 21R is performed as follows. This is performed by feeding the foamed sheet 110 arranged on the upstream side of the sheet placing portion 21R by a transport belt or a transport roller. Here, the sheet conveying device 21 is provided with a position sensor 21S for detecting the leading end of the foam sheet 110 at the downstream end of the sheet placing portion 21R (see FIG. 5). The foam sheet 110 is fed until the tip of the foam sheet 110 is detected by the sensor 21S.

  The slitter 22 includes a plurality of blades 23 at regular intervals in the sheet width direction. In the present embodiment, the plurality of blades 23 are formed in a disk shape, are arranged so that their central axes face the sheet width direction, and are attached at equal intervals to a support shaft 24 extending in the sheet width direction.

  As shown in FIGS. 3 and 4, the slitting device 20 includes a feed guide 30 for guiding the foamed sheet 110 in the sheet feeding direction above the sheet placing portion 21R. Specifically, the feed guide 30 is formed in a rod shape extending in the feed direction of the sheet conveying device 21 (hereinafter, referred to as “sheet feed direction”), and enters the valley groove 16 of the foam sheet 110. The upstream end of the feed guide 30 in the sheet feeding direction is formed in a shape that is sharpened toward the upstream side. Thereby, the feed guide 30 can easily enter the valley groove 16 of the foamed sheet 110 sent by the sheet conveying unit 21.

  As shown in FIG. 4, the feed guides 30 are arranged in pairs in the sheet width direction. Here, the width of the feed guide 30 (length in the sheet width direction) is smaller than the width of the valley groove 16 of the foam sheet 110, and the pair of feed guides 30, 30 sandwich the valley groove 16. 15 are in contact with the ridges 15 arranged outside in the sheet width direction. More specifically, the feed guide 30 is in contact with a portion of the ridge 15 near the vertex, and has a gap between the feed guide 30 and the bottom of the valley groove 16. As described above, the slit processing apparatus 20 of the present embodiment is configured such that the feed guides 30 are formed narrower than the valley grooves 16 and are arranged in pairs in the sheet width direction, so that the ridges of the foam sheet 110 are formed. 15 can be surely directed in the sheet feeding direction, and can be applied to foamed sheets 110 having different widths of the valley grooves 16. In addition, the slit processing device 20 can be applied to the foam sheet 110 in which the depth of the valley groove 16 is different because the feed guide 30 has a gap between the feed guide 30 and the bottom of the valley groove 16. In the slitting device 20, the use of the feed guide 30 makes it possible to apply the foamed sheet 110 having various types of ridges 15 having different widths of the valley grooves 16 and different depths of the valley grooves 16, thereby improving productivity. Is achieved.

  As shown in FIG. 3, a plurality of pairs of feed guides 30, 30 are provided at intervals in the sheet feeding direction. In the present embodiment, the pair of feed guides 30, 30 are disposed at positions near both ends in the sheet width direction above two portions of the sheet placing portion 21R, that is, the upstream portion and the downstream portion in the sheet feeding direction. ing.

  The cross-sectional shape of the feed guide 30 cut in the sheet width direction is formed in a trapezoidal shape having a narrow width on the lower side. It is more vertical than it is. As a result, the contact area between the side surface of the feed guide 30 and the side surface of the ridge 15 can be reduced, and the sliding resistance of the feed guide 30 when feeding the foam sheet 110 can be reduced.

  As shown in FIG. 4, the feed guide 30 is movable in the sheet width direction by an electric slider 31. The electric slider 31 is supported by a beam member 27 extending in the seat width direction. The beam member 27 is provided on the support frame 26 described above.

  As shown in FIGS. 3 and 4, the slit processing device 20 includes a camera 40 above the sheet placement unit 21R. The camera 40 is, for example, a CCD camera, and captures an image of a certain range including the valley groove 16 in the foam sheet 110 conveyed by the sheet conveying device 21.

  In the present embodiment, a plurality of cameras 40 are provided. Specifically, the plurality of cameras 40 are disposed immediately above both ends in the sheet width direction in the upstream portion and the downstream portion in the sheet feeding direction of the sheet placing portion 21R. As a result, the plurality of cameras 40 are provided at four locations (specifically, both ends in the sheet width direction at the upstream portion and the sheet width direction at the downstream portion) of the foam sheet 110 placed on the sheet placement portion 21R. Both ends) can be imaged.

  As shown in FIG. 4, the slit processing device 20 includes a light 41 for illuminating an object to be imaged by the camera 40, thereby suppressing an image of the camera 40 from being darkened. The lights 41 are provided corresponding to each of the plurality of cameras 40. In the example shown in FIG. 4, one light 41 is provided for one camera 40, but a plurality of lights 41 may be provided.

  FIG. 5 shows an electrical configuration of the slit processing device 20. As shown in the drawing, the slit processing device 20 includes a control unit 50 that controls the above-described sheet conveying device 21, the electric slider 31, and the camera 40. The control unit 50 is constituted by, for example, a PC (personal computer) and includes a CPU 50A, a RAM 50B, and a ROM 50C. The CPU 50A executes various processes for controlling the sheet conveying device 21, the electric slider 31, and the camera 40. The image data of the camera 40 is temporarily stored in the RAM 50B. The ROM 50C stores a slit processing program PG1 (see FIG. 6) executed by the CPU 50A.

  In the present embodiment, the position data of the blade 23 of the slitter 22 is temporarily stored in the RAM 50B and then stored in the ROM 50C. The position of the blade 23 is detected using the camera 40. Specifically, as shown in FIG. 7, in a state in which a laser device 42 that emits laser light downstream in the sheet feeding direction is arranged on the upstream side in the sheet feeding direction with respect to the sheet placing portion 21R, The laser light is applied to the blade 23 of the slitter 22. At this time, the laser light is applied to the blade 23 that cuts the valley groove 16 captured by the camera 40. Then, the laser light is imaged by the camera 40 in a state where the laser light hits the blade 23. The control unit 50 detects the position of the laser beam in the image from the image data, and temporarily stores the position in the RAM 50B as the position of the blade 23 of the slitter 22 (position as coordinates in the sheet width direction). FIG. 8A shows an example of an image when the camera 40 captures a laser beam. In this example, the vertical direction of the image is the sheet width direction, and a laser beam (indicated by a dashed line in the figure) is arranged at a position X1 from the upper end of the image. .

  FIG. 6 shows a flow of the slit processing program PG1 executed by the CPU 50A. In the slit processing program PG1, first, an initial position setting process S11 is executed. In the initial position setting process S11, the driving of the conveying motor 21K of the sheet conveying device 21 is controlled, and the foam sheet 110 is mounted on the sheet mounting portion 21R (see FIG. 3).

  When the initial position setting processing S11 ends, a valley center detection processing S12 is then performed. In the valley center detection processing S12, first, a control signal is transmitted to the camera 40 to cause the camera 40 to image the valley grooves 16 at a plurality of locations on the foam sheet 110. Data of the image captured by the camera 40 is transmitted to the control unit 50. Then, the image data is analyzed to determine the position of the center of the valley groove 16 in the image. FIG. 8B shows an example of an image when the camera 40 captures an image of the valley groove 16. In this example, the valley groove 16 is shown in light gray, and the center of the valley groove 16 (indicated by a dashed line in the figure) is arranged at a position X2 from the upper end of the image. ing. The detection of the center of the valley groove 16 is performed for each of the images captured by the plurality of cameras 40.

  When the valley center detection processing S12 ends, next, a deviation amount calculation processing S13 is executed. In the shift amount calculation processing S13, the position of the blade 23 of the slitter 22 (the position as the coordinate in the sheet width direction) stored in the RAM 50B or the ROM 50C and the position of the center of the valley groove 16 detected in the valley center detection processing S12. , The deviation amount ΔX (that is, X2−X1) of the center of the valley groove 16 in the sheet width direction with respect to the position of the blade 23 is calculated. In the present embodiment, the shift amount ΔX calculated in the shift amount calculation process S13 is an average of the shift amounts ΔX calculated from the images of the plurality of cameras 40.

  When the shift amount calculation process S13 ends, a process S14 of determining whether the calculated shift amount ΔX is within a preset specified value is performed. If it is determined in this process S14 that the deviation amount ΔX is not within the specified value, a sheet position adjustment process S15 is executed.

  In the sheet position adjustment processing S15, the position of the foam sheet 110 in the sheet width direction is adjusted so that the deviation amount ΔX calculated in the deviation amount calculation processing S13 falls within a specified value. Specifically, the foam sheet 110 is moved in the sheet width direction so that the displacement amount ΔX becomes zero. The movement of the foam sheet 110 is performed by transmitting a control signal to the electric slider 31 to move the feed guide 30 in the sheet width direction.

  In the present embodiment, when the sheet position adjustment processing S15 ends, the valley center detection processing S13 is executed again. Therefore, the sheet position adjustment processing S15 (that is, the position adjustment of the foam sheet 110 in the sheet width direction) is repeatedly performed until the deviation amount ΔX is determined to be within the specified value in the processing S14.

  If it is determined in the processing S14 that the deviation amount ΔX is within the specified value, the slit processing S16 is executed, and the slit processing program PG1 ends. In the slit processing S16, a control signal is transmitted to the conveying motor 21K of the sheet conveying device 21 to send the foamed sheet 110 to the slitter 22. Then, the foam sheet 110 is cut by the slitter 22 in the sheet width direction at the valley grooves 16, and the foam sheet 110 is divided (cut) into a plurality of strip-shaped foams 11. Then, the tire sound absorbing material 10 is formed from each band-shaped foam 11.

  As described above, in the slit processing apparatus 20 of the present embodiment, the shift amount ΔX between the center of the valley groove 16 in the sheet width direction and the position of the blade 23 of the slitter 22 is calculated, and the foam sheet 110 is calculated based on the shift amount ΔX. Is adjusted. Accordingly, a number of manufacturing steps such as cutting the sheet-like foam into a shape in which a plurality of ridges 15 extend in the longitudinal direction and pressing a double-sided tape on a surface opposite to the ridges 15 are performed. Even after passing, in the band-shaped foam 11 obtained from the foam sheet 110, the position of the ridge 15 in the width direction is stabilized, and the yield of the tire sound absorbing material 10 is improved.

  In the present embodiment, since the center of the valley groove 16 is detected from the image of the valley groove 16 captured by the camera 40, the center of the valley groove 16 can be accurately detected. In addition, the provision of the light 41 for illuminating the periphery of the valley groove 16 prevents the image of the camera 40 from being darkened, and makes it easier to detect the center of the valley groove 16.

  Further, in the present embodiment, the position of the laser light in the sheet width direction is detected from the image of the laser light irradiated in the sheet feeding direction and hitting the blade 23 of the slitter 22, and the position of the laser light is determined by the blade of the slitter 22. 23 is stored. According to this configuration, it is possible to accurately obtain the shift amount ΔX between the center of the valley groove 16 and the position of the blade 23 of the slitter 22 in the sheet width direction.

  Further, in the present embodiment, the camera 40 is provided right above a plurality of locations of the sheet placing portion 21R, so that the average of the deviation amounts ΔX at the plurality of locations of the foam sheet 110 is within a specified value. The position 110 in the sheet width direction is adjusted. This makes it possible to reduce the amount of deviation ΔX between the center of the valley groove 16 and the position of the blade 23 of the slitter 22 in the sheet width direction over the entire foam sheet 110.

  In the present embodiment, the RAM 50B and the ROM 50C of the control unit 50 correspond to “slitter blade position storage means” described in the claims, and the light 41 corresponds to “illumination means” described in the claims. . Further, the control unit 50 when performing the valley center detection processing S12 corresponds to “valley groove center detection means” described in the claims, and the control unit when performing the shift amount calculation processing S13. Reference numeral 50 corresponds to the "shift amount calculating means" described in the claims, and the control unit 50 when executing the sheet position adjustment processing S15 corresponds to "the sheet position adjusting means" described in the claims. I do.

[Other embodiments]
(1) In the above embodiment, the camera 40 is arranged above the sheet conveyance path 21R of the sheet conveyance device 21. However, if the camera 40 is arranged above the foam sheet 110 before being fed to the slitter 22, The present invention is not limited to the area above the sheet conveying path 21R. That is, the camera 40 may be arranged above the foam sheet 110 set at the initial position in the initial position setting process of FIG.

  (2) In the above embodiment, the number and arrangement of the feed guides 30 are not particularly limited. For example, only two feed guides 30 may be provided at intervals in the sheet width direction. Further, when the feed guide 30 abuts both of the two ridges 15 sandwiching the valley groove 16, only one feed guide 30 may be provided.

  (3) The number of protrusions 15 included in the tire sound absorbing material 10 (the band-like foam 11) may be one, or may be three or more.

  (4) In the above-described embodiment, the number and arrangement of the cameras 40 are not particularly limited. For example, two cameras 40 may be positioned immediately above both ends in the sheet width direction in the downstream portion of the sheet placing portion 21R. It may be arranged.

  (5) In the above embodiment, the position of the blade 23 of the slitter 22 (the position as a coordinate in the sheet width direction) is temporarily stored in the RAM 50B by image analysis and then stored in the ROM 50C, but is stored only in the RAM 50B. Or may be stored as a fixed value in the ROM 50C from the beginning.

  (6) In the above embodiment, the pair of feed guides 30, 30 are arranged so as to be in contact with the protrusions 15 located on the outer side in the sheet width direction among the two protrusions 15 sandwiching the valley groove 16. , May be arranged so as to be in contact with the ridge 15 located inside in the sheet width direction.

DESCRIPTION OF SYMBOLS 10 Tire sound absorbing material 15 Ridge 16 Valley groove 20 Slit processing device 21 Sheet transport device 22 Slitter 23 Blade 30 Feed guide 40 Camera 50 Control unit 110 Foam sheet

Claims (10)

Used in the manufacture of tire sound-absorbing material composed of a band-shaped foam and fixed to the tire in the tire lumen,
By feeding a rectangular foamed sheet comprising a plurality of ridges in parallel on one side in the extending direction of the ridges with the ridges facing upward and supplying the same to the slitter, a gap between the ridges is provided. A slit processing apparatus that divides the foam sheet in the sheet width direction at a valley groove to obtain a plurality of the band-shaped foams,
Slitter blade position storage means for storing the position of the blade of the slitter in the sheet width direction,
A groove center detecting means for detecting the center of the groove in the sheet width direction,
The center of the valley groove from the position of the slitter blade based on the center of the valley groove detected by the valley groove center detection unit and the position of the slitter blade stored in the slitter blade position storage unit. Deviation amount calculating means for calculating the deviation amount of
Sheet position adjusting means for moving the foamed sheet in the sheet width direction such that the shift amount is within a predetermined value based on the shift amount calculated by the shift amount calculating means. , Slit processing equipment. Having a camera that images the valley groove from directly above,
The slit processing apparatus according to claim 1, wherein the valley groove center detecting unit detects a center of the valley groove from an image of the camera that has captured the valley groove.   The slit processing apparatus according to claim 2, further comprising an illumination unit that emits light around the valley groove. Having a laser device that irradiates a laser beam in the feed direction of the foam sheet and hits the blade of the slit,
4. The slit according to claim 2, wherein the slitter blade position storage unit detects a position of the laser light from an image of the camera capturing the laser light, and stores the position as a position of the slitter blade. 5. Processing equipment. A plurality of the cameras are arranged directly above a plurality of places in the foam sheet,
The shift amount calculating means calculates an average of the shift amounts at a plurality of locations in the foam sheet,
The slit processing apparatus according to claim 2, wherein the sheet position adjusting unit moves the foamed sheet such that an average of the deviation amount is within the specified value. Extending in the feed direction of the foam sheet and entering the valley groove, having a plurality of feed guides in the sheet width direction,
The slit processing device according to claim 1, wherein the sheet position adjusting unit moves the feed guide in the sheet width direction.   The slit processing device according to claim 6, wherein the feed guide is in contact with one of the two ridges sandwiching the valley groove, and has a gap between the ridge and the bottom of the valley groove.   The slit processing apparatus according to claim 6, wherein the sheet position adjusting unit moves the feed guide in the sheet width direction by an electric slider.   The slit processing device according to any one of claims 1 to 8, wherein a blade of the slitter is formed in a disk shape and attached to a support shaft extending in the sheet width direction. Using the slit processing device according to any one of claims 1 to 9,
A method for producing a tire sound-absorbing material, the method comprising producing the tire sound-absorbing material.