JP4424969B2 - Piercing device - Google Patents

Description

  The present invention includes, for example, a carcass ply material as a tire component, a belt layer material, or the like that is included in a rubber sheet in which a reinforcing layer cord is embedded, or remains between layers that are laminated when forming a raw tire or the like. The present invention relates to a piercing device used for drilling a large number of small holes in a rubber sheet for the purpose of smooth and sufficient extraction of air, etc. It is an object of the present invention to provide a technique capable of preventing the action and sufficiently preventing the unnecessary expansion of the perforated small hole and the deformation of the rubber sheet.

  As a conventional piercing device of this type in which a small hole is drilled in a rubber sheet without fear of breakage of a puncture needle, for example, the one shown in Patent Document 1 is known, and FIG. As shown, the device 90 rotates the outer cylinder 91 and the inner cylinder 92 around respective fixed shafts 94 and 95 that are eccentric to each other by δ, and is inserted into the inner cylinder 92. However, it is known that a needle access hole 96 provided in the outer cylinder 91 can be freely entered and exited (for example, Patent Document 1).

According to this, each of the outer cylinder 91 and the inner cylinder 92 is pushed out of the needle entry / exit hole 96 by rotating eccentrically on the fixed shaft based on the pressing of the outer cylinder 91 to the rubber sheet S to be run. The rubber sheet S is pierced by the piercing needle 93 and the piercing needle 93 that has finished the work can be smoothly drawn into the outer cylinder 91 from the needle loading / unloading hole 96.
Japanese Patent Publication No. 50-29752

  However, in this conventional apparatus, the structure in which the puncture needle 93 stabbed into the rubber sheet S wound around the outer cylinder 91 has to move relative to the rubber sheet S along its traveling direction. For this reason, there were problems that unnecessary expansion of the perforated small holes and deformation of the rubber sheet occurred. The cause of this relative movement will be described below. When the radius of the outer peripheral surface of the outer cylinder 91 is r, and the rubber sheet S is wound around the outer cylinder 91 in the direction of the arrow shown in FIG. 7 and travels at a constant linear velocity v, the surface speed of the outer cylinder 91 is also Since v, the rotation speed of the outer cylinder 91 is v / r.

  The insertion needle 93 starts to pierce the rubber sheet S at the wrapping start point A of the rubber sheet S, and the insertion needle 93 and the rubber sheet S do not move relative to each other at the start point A. Since the radius of rotation to the inner peripheral surface of the rubber sheet S at the starting point A is approximately r, the rotational speed of the inner cylinder 92 must be v / r, similar to the rotational speed of the outer cylinder 91. On the other hand, in order to prevent the puncture needle 93 and the rubber sheet S from moving relative to each other at the intermediate point B where the outer cylinder 91 is rotated 90 degrees from the starting point A, the rubber sheet S of the puncture needle 93 at the intermediate point B. Since the rotation radius to the inner peripheral surface is (r−δ), the rotation speed of the inner cylinder 92 must be v / (r−δ).

  If only one puncture needle 93 is provided on the inner cylinder 92, the puncture needle 93 and the rubber sheet S are moved relative to each other by changing the rotational speed of the inner cylinder 92 according to the rotational position. It is possible to prevent it from occurring. However, in the conventional apparatus 90, since all the insertion needles 93 positioned at a predetermined interval in the circumferential direction are integrally implanted in the inner cylinder 92, the needles at different rotational positions The rotation speed of the inner cylinder 92 must be the same. Eventually, the inner cylinder 92 also rotates at a substantially constant rotation speed, and is rotated once every time the outer cylinder 91 rotates. Therefore, particularly in the vicinity of the intermediate point B, the relative movement of the puncture needle 93 and the rubber sheet S becomes remarkable, and it has not been possible to prevent expansion of the drilled small hole.

  The present invention has been made in view of such a problem, and prevents an excessive force from being applied to the piercing needle, sufficiently expanding unnecessary small holes, deformation of the rubber sheet S, and the like. An object of the present invention is to provide a piercing device that can prevent the piercing needle 3 from expanding a small hole formed in the rubber sheet S even when the insertion needle 3 enters and leaves the rubber sheet S. is there.

  (1) In the present invention, a rotationally driven outer cylinder is supported by bearings on one of the shafts that are eccentric to each other, and a radius is provided on the other shaft in the outer cylinder at a circumferential interval. A plurality of needles protruding outward in the direction are arranged independently of each other so as to be rotatable, and each needle can enter and exit the outer cylinder surface through a through-hole formed in the outer cylinder. The piercing device comprises a needle restraining member which is rotationally driven on the other shaft and transmits a rotational force to the insertion needle.

  (2) The present invention is the piercing device according to (1), wherein each of the outer cylinder and the needle restraining means is connected to a driving means that rotates them at a constant speed.

  (3) According to the present invention, in (1) or (2), piercing is performed such that the rotational radius of the outer cylinder surface is equal to the rotational radius of the tip of the piercing needle, and the eccentric amount of each axis is in the range of 10 to 15 mm Device.

  According to (1), a plurality of piercing needles protruding radially outward at intervals in the circumferential direction are disposed independently of each other and can be freely rotated. The insertion needle can be inserted into the rubber sheet through the through-hole formed in, and then freely rotated by being driven by the rubber sheet without any extra restraining force. Therefore, it is possible to prevent an excessive force from being applied to the puncture needle, and to sufficiently prevent unnecessary expansion of the drilled small hole and deformation of the rubber sheet.

  According to (2), since each of the outer cylinder and the needle restraining means is connected to the driving means that rotates them at a constant speed, the average peripheral speed of the rubber sheet feed and the average peripheral speed of the needle insertion Therefore, the punching of the rubber sheet with the piercing needle can be continued stably without applying an excessive force.

  According to (3), since the rotation radius of the outer cylinder surface and the rotation radius of the tip of the insertion needle are made equal, it can be inserted or escaped substantially perpendicularly to the rubber sheet, The enlargement can be prevented more reliably, and the eccentric amount of the shaft at this time is set to 10 to 15 mm, so that the hole can be surely made in the rubber sheet, and the hole does not become too large.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing a piercing device 1 of this embodiment, FIG. 2 is a cross-sectional view corresponding to the arrow II-II in FIG. 1, and FIG. 3 corresponds to the arrow III-III in FIG. It is sectional drawing. The piercing device 1 is supported by bearings 11A and 11B, and is rotatably provided on a fixed shaft 8 and an outer cylinder 2 integrally connected to a rotating shaft 7 that is rotationally driven by a motor M, and is spaced circumferentially. And a plurality of piercing needles 3 protruding outward in the radial direction. Here, the rotating shaft 7 constitutes one axis having X1 as an axis, and the fixed shaft 8 constitutes the other axis having X2 as an axis, and these axes X1 and X2 are eccentrically provided by δ.

  The bearings 11 </ b> A and 11 </ b> B are fixed to the stay 13, and the base end of the fixed shaft 8 is fixed to the stay 14 and the distal end thereof is supported by the rotating shaft 7 via the bearing member 12. Since the stay 13 and the stay 14 are integrally connected, the bearings 11A and 11B, the fixed shaft 8, the stays 13 and 14, and the bearing member 12 are all integrated.

  In the example shown in the drawing, the piercing needles 3 are provided in two rows in the axial direction, six on the circumference of each row, a total of twelve. The insertion needles 3 in each row are connected to bearings 4 (4a to 4f) provided to be rotatable independently of each other in a one-to-one correspondence. The needle 3a is connected to the bearing 4a, the insertion needle 3b is connected to the bearing 4b, and the insertion needles 3c to 3f are connected to the corresponding bearings 4c to 4f, respectively. Then, the bearings 4a to 4f can rotate around the axis X2 independently of each other. Therefore, the needles 3a to 3f can also rotate around the axis X2 independently of each other.

  The insertion needle 3 (for example, 3a) is inserted into and attached to a hole provided at the tip of the needle support 26a attached to the bearing 4a, and the needle 3a is positioned for the radial positioning of the insertion needle 3a. The positioning needle 27a is fixed to the needle support 26a, and the insertion needle 3a can be positioned by inserting the convex portion of the needle positioning plate 27a into the notch formed in the insertion needle 3.

  Further, the outer cylinder 2 is provided with a through hole 5 at a position corresponding to the piercing needle 3, and the piercing needle 3 protrudes radially outwardly of the outer cylinder 2 with respect to the outer cylinder surface. The tip can be moved in and out. For example, if the radius of the outer cylinder 2 and the rotation radius of the tip of the puncture needle 3 around the axis X2 are set to the same diameter r, and the eccentricity δ between the axis X1 and the axis X2 is set to 10 mm The maximum protrusion amount of the puncture needle 3 from the outer cylinder 2 outward in the radial direction is 10 mm.

Here, when the radius of the outer cylinder 2 and the rotation radius of the tip of the piercing needle 3 around the axis X2 are set to the same diameter r, the piercing needle 3 with respect to the rubber sheet S is substantially the same speed. While moving, it can be inserted or exited in a substantially vertical direction, which is preferred, but in practice, these radii need only be substantially the same, ie, the turning radius of the piercing needle 3 is The radius of the outer cylinder 2 may be slightly larger or smaller as long as the needle 3 provides a small hole having a size that is acceptable for the rubber sheet S.
The maximum protrusion amount of the needle 3 from the outer cylinder 2 in the radial direction is preferably in the range of 10 mm to 15 mm, and if this is less than 10 mm, the needle 3 that has stabbed into the corded rubber sheet S is made of rubber. It is difficult to pierce a small hole just by stretching it thin, and if it exceeds 15 mm, the small hole to be pierced becomes too large, leading to the entry of other types of rubber into this small hole, or the cross section of the tire The problem arises that the shape cannot be smoothed.

  The fixed shaft 8 having the other axis X2 as an axis has a needle restraining member 6 supported by bearings. The needle restraining member 6 is provided with guide bars 9 arranged at equal intervals in the circumferential direction. The guide bar 9 extends in parallel with the axes X1 and X2, and both axial ends thereof are fixed to the end plates 15 and 16. An internal gear 22 is attached to the end plate 16 concentrically with the axis X2. On the other hand, an internal gear 22 is attached to the end of the outer cylinder 2 in the axial direction concentrically with the axis X1, and the internal gear 21 and the internal gear 22 are attached. Is engaged with each other via the intermediate gear 23, and the internal gear 21 and the internal gear 22 are set to have the same number of teeth, so that the outer cylinder 2 and the needle restraining member 6 are completely synchronized. Then rotate.

  The operation of the apparatus 1 when a small hole is formed in the corded rubber sheet S wound around the outer cylinder 2 using the piercing apparatus 1 configured as described above will be described below. As shown by the arrow in FIG. 2, when the outer cylinder 2 is driven counterclockwise, the rubber sheet S wound around the outer peripheral surface of the outer cylinder 2 with a winding angle of 180 degrees also moves in the direction of the arrow. Travel at the same speed as the surface speed of 2. The puncture needle 3 that has reached the winding start point A of the rubber sheet S begins to stab the rubber sheet S and is driven by the rubber sheet S to start rotating around the axis X2. The rubber sheet S is not subjected to unnecessary force because it is not subjected to any constraint other than being driven by the motor.

In FIG. 2, when the puncture needle 3 passes the point immediately above the axis and reaches the winding end point B, the puncture needle 3 comes out of the rubber sheet S. During this time, the puncture needle 3 and the rubber sheet Since it is moving in synchronism with S, it is possible to prevent the small holes from expanding or the rubber sheet S from being deformed. Since the outer cylinder 2 rotates 180 degrees between the start point A and the end point B, the rotation center X2 of the needle 3 is eccentric from the axis X1 of the outer cylinder 2, so The needle 3 is further rotated by an angle θ corresponding to the amount of eccentricity δ.

  In addition, at the starting point A and the ending point B where the rubber sheet S is wound around the outer cylinder 2, the piercing needle 3 can be pierced or withdrawn substantially perpendicularly to the rubber sheet S. When the insertion needle 3 enters and exits the sheet S, the small holes to be drilled are not unnecessarily enlarged.

  The puncture needle 3 detached from the rubber sheet S is given a rotational force by the guide bar 9 rotating in synchronization with the outer cylinder 2 and can return to the starting point A. The above operation can be repeated by starting to pierce.

  The number and arrangement of the needles described in the above examples are not limited to those illustrated, and the winding angle is not limited to 180 degrees. The device 1 can be applied to a rubber sheet in which a cord is provided at a right angle to the traveling direction. However, in the conventional device of this type, the small holes are enlarged along the traveling direction of the rubber sheet as described above. By applying the piercing device 1 of the present invention to a rubber sheet without a cord or a cord without a cord or a cord with the cord facing the traveling direction, the piercing device 1 of the present invention is more easily expanded. A remarkable effect can be obtained.

  Further, a drive device for running the rubber sheet S can be provided separately from the piercing device, and the outer cylinder 2 can be driven by the rubber sheet S. However, as in the present embodiment, the outer cylinder 2 is By being driven by the motor M, the piercing device 1 can be provided with a function of driving the rubber sheet S so that space and cost can be saved.

  As described above, the embodiment has been described by taking the case where the needles 3 are arranged in two rows in the axial direction as an example, but in this embodiment, when the needles are increased and arranged more densely in the axial direction. However, the number of bearings must be increased by that amount, but the number of bearings that can be arranged in a line on the shaft is naturally limited. Therefore, another manner of attachment to the bearing of the needle that can be used even in such a case will be described with reference to FIGS.

  4 is a cross-sectional view showing another piercing device in which the manner of attaching the needle to the bearing is different, FIG. 5 is a cross-sectional view corresponding to the arrow V-V in FIG. 1, and FIG. It is the front view which looked at the part which supports a needle | hook from the front, In these figures, except the part regarding attachment to the bearing of a piercing needle, it is completely the same as the corresponding | compatible part shown in FIGS. These parts are denoted by the same reference numerals as in FIGS. 1 to 3, and in the following description, the description of the same configuration part is omitted.

  In the example shown in the figure, the puncture needle 33 is attached to the radially outer end of a needle support plate 36a in which four puncture needles 33 (for example, 33a) arranged in the axial direction extend in the radial direction. In addition, six needle support plates 36a to 36f are arranged in the circumferential direction, and therefore a total of 24 needles 33 are provided. On the other hand, twelve bearings 34a1 to 34f1 and 34a2 to 34f2 are arranged on the axis X2, and these bearings are provided so as to be able to rotate around the axis X2 independently of each other.

  The needle support plate 36a is attached to the pair of bearings 34a1, 34a2, the needle support plate 36b is attached to the pair of bearings 34b1, 34a2, and the needle support plates 36c, 36d, 36e, and 36f are similarly provided. It is attached to a pair of bearings (36c1, 36c2), (36d1, 36d2), (36e1, 36e2) and (36f1, 36f2) corresponding to one to one in this order. Since the twelve bearings 34a1 to 34f1 and 34a2 to 34f2 can rotate independently of each other, the needle support plates 36a to 36f, and thus the needles 33a to 33f arranged in the circumferential direction also rotate independently of each other. can do.

  The insertion needle 33 (for example, 33a) is inserted into and attached to the hole provided at the tip of the needle support plate 36a, and the needle positioning plate 37a is used for positioning the insertion needle 33a in the radial direction. The insertion needle 33a can be positioned by inserting the convex portion of the needle positioning plate 37a into the notch formed in the insertion needle 3 that is fixed to the needle support plate 36a.

  With the above configuration, each of the needles 33a to 33f can be operated in the same manner as described in the previous embodiment, and as a result, the piercing device of this aspect can also provide the same operation. .

It is sectional drawing which shows the piercing apparatus of embodiment which concerns on this invention. It is sectional drawing of the piercing apparatus corresponding to the II-II arrow line of FIG. It is sectional drawing of the piercing apparatus corresponding to the III-III arrow of FIG. It is sectional drawing which shows the other piercing apparatus from which the attachment aspect to the bearing of a piercing needle differs. It is sectional drawing of the piercing apparatus corresponding to the VV arrow of FIG. It is the front view which looked at the part which supports the puncture needle from the front. It is sectional drawing which shows the conventional piercing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piercing apparatus 2 Outer cylinder 3, 3a-3f Insert needle 4, 4a-4f Bearing 5 Through-hole 6 Needle restraint member 7 Rotating shaft 8 Fixed shaft 9 Guide bar 11A, 11B Bearing 12 Bearing member 13, 14 Stay 15, 16 End plate 21, 22 Internal gear 23 Intermediate gear 26a Needle support 27a Needle positioning plate 33, 33a-33f Insert needle 34a1-34f1, 34a2-34f2 Bearing 36a-36f Needle support plate 37a-37f Needle positioning plate S Rubber sheet M Motor X1, X2 axis

Claims (3)

  A plurality of outer cylinders that are rotationally driven are supported by bearings on one of the shafts that are eccentric to each other, and projecting radially outward with a circumferential spacing on the other shaft in the outer cylinders. The needles of the book are arranged so as to be rotatable independently of each other, and each needle can be inserted into and removed from the outer cylinder surface through a through-hole formed in the outer cylinder, and on the other axis. A piercing device comprising a needle restraining member which is driven to rotate and transmits a rotational force to the insertion needle.   The piercing device according to claim 1, wherein each of the outer cylinder and the needle restraining means is connected to a driving means for rotating them together at a constant speed.   The piercing device according to claim 1 or 2, wherein the rotation radius of the outer cylinder surface is equal to the rotation radius of the tip of the insertion needle, and the eccentric amount of each shaft is in the range of 10 to 15 mm.

Images