FI120484B - Tire cutting device, method of cutting a sidewall of a tire and use of cutting device - Google Patents

Description

TIRE CUTTING DEVICE, METHOD FOR TIRE SIDES

FOR CUTTING AND USING THE CUTTING DEVICE

DÄCKSKÄRNINGSANORDNING, FÖRFARANDE FÖR SKÄRNING AV ETT 5 DÄCKS BINDING SAMT ANVÄNDNING AV SKÄRNINGSANORDNING

TECHNICAL FIELD OF THE INVENTION

The invention relates to a ring cutting machine as described in the preamble of the independent claims 10 below, to a method of cutting a sidewall of a tire, and to the use of a cutting device.

BACKGROUND OF THE INVENTION

15 There is a large world-wide accumulation of used car tires, which is being recycled instead of being recycled. Used tires can be used, for example, as fuel in industrial furnaces or combustion boilers, as a filler in earthworks, or as rubber milks, for example for use in blast protection. In many cases, complete rings must be cut into smaller parts before being reused. For example, in combustion furnaces, whole tires burn too slowly, and in construction, whole tires easily leave empty space, which results in a loss of tightness and stability. For certain uses, the sidewalls of the tire in particular need to be cut off from the tire, which then leaves the tire tread in addition to the sidewalls.

25

FR 2764227 discloses a device for cutting large rings in particular. The device has a notched knife blade which can be moved relative to the ring so that, for example, the sidewall of the ring can be cut off. The action is based on the incisive knife shear force. The problem is that, due to the softness and flexibility of the material to be cut, cutting by incision requires a considerable amount of counter-force or a solid counter surface 2 for the cutting to be successful. The ring to be cut must be able to support well, especially near the blade and the cutting point.

WO 02/076692 A1 discloses a device for removing a tire sidewall 5. It comprises a support frame, rollers for rotating the tire, and a disc-shaped motor-operated blade and a freely rotating counter blade. A motor-driven blade usually has a problem with the noise it produces and sometimes with an untidy cut.

10 Cutting with a toothed blade, for example a motor-driven circular saw, is based on the fact that the teeth of the rotating blade consume by cutting material away from the cutting object to form an aperture about the width of the blade. The problem with this cutting method is that rubber dust and debris as well as pieces of metal reinforcing wires and metal dust come off the tire. The sawing method 15 also causes considerable noise and tears apart the rubber material to be cut across the metal reinforcing wires so that the cutting surface becomes jagged and typically has sharp protruding ends of metal wires.

OBJECTIVE AND BRIEF DESCRIPTION OF THE INVENTION

20

The object of the present invention is to reduce or even eliminate the above-mentioned problems in the prior art.

The object of the invention is to significantly reduce the noise generated during tire cutting as well as rubber and metal dust.

It is an object of the invention to provide a ring cutting device which provides a clean and even cutting pattern without leaving sharp protruding ends of reinforcing yarns on the cutting surface.

30

Among other things, to accomplish the above purposes, the tire cutting device of the invention, the method of cutting the sidewall of the tire, and the use of the 3 cutting device are characterized by what is disclosed in the appended independent claims.

The application examples and advantages mentioned herein apply mutatis mutandis to the tire cutting device of the invention, the method of cutting the sidewall of the tire, and the use of the cutting device, although not always specifically mentioned.

A typical ring cutting device according to the invention comprises 10 - a frame - at least one blade unit comprising - a cutting blade rotatable about its axis and arranged therethrough in relation to the frame, and - a counterpiece arranged along the cutting blade such that between the cutting blade and the counterpiece, and - means for rotating the ring relative to the cutting unit.

The counterpiece of a typical cutting device according to the invention comprises a cutting edge and the cutting blade is rotatable with respect to the counterpiece so that a shearing force is generated between the cutting edge of the cutting blade and the cutting edge of the counterpiece.

In a typical method of cutting the tire sidewall with a cutting device 25, the counterpart is at least partially disposed through the tire sidewall, and and 30 shear force cutting it.

4

In a typical use of a cutting device according to the invention for cutting tires, the cutting device is in accordance with the invention disclosed in this application.

In this application, both tire and car tire generally refer to the tire of a vehicle such as a car, bus, truck, truck, tractor or the like, and in particular to its rubber part, which often also includes metal reinforcing wires.

According to one embodiment, the blade unit is integral with the cutting unit body. The blade unit may also be removably attached to the frame or may be a detachable device arranged in connection with the cutting unit body. The blade unit may also have its own body, which may be formed, for example, by a socket head. The blade unit body may be part of the cutting unit body or completely separate from it.

By cutting edge is meant an edge of the cutting blade and counterpiece which is typically 90 ° or less, for example 1 to 90 °, 10 to 85 °, 20 to 70 °, 30 to 70 ° or 45 to 70 °. Preferably, the angle of the cutting edge is as small as possible slightly rounded.

By shearing force is meant essentially the same force generated between the blades of a scissor when cutting with a scissor. When using the cutting device according to the invention, the cutting force is formed between the cutting edge of the cutting blade and the cutting edge of the counter piece. The shear force divides the object to be cut into two parts without consuming a considerable amount of cutting waste, as is typically the case when cutting, for example.

According to one embodiment of the invention, the cutting edge 30 of the cutting blade has a substantially circular cross-section in the direction perpendicular to the axis of rotation. The cutting edge of a circular cutting blade is formed by the peripheral part of the blade, i.e. the outermost part of the blade. According to one embodiment, the cutting edge is formed of a very hard material, for example special steel or diamond. The periphery of the blade may have a clean circular shape or have protrusions, for example rounded or sharp tooth patterns.

5

According to one embodiment of the invention, the mating device counterpart can be arranged in connection with the cutting blade with respect to the body of the device. The counterpiece may be disposed fixedly or detachably to the blade or, for example, rotated or moved into the blade prior to cutting the ring 10.

According to one embodiment of the invention, the counterpiece comprises a pointed tip portion. It can be used to provide an opening in the tire sidewall. At the same time, said tip portion can be provided at least partially through the sidewall of the ring. The aperture may also be formed by a separate sharp tool, whereby a sharp tip portion is not required in the counterpart.

According to one embodiment of the invention, the counterpiece is secured to the cutting blade by removably pushing or otherwise arranging it in a fastening member such as a rail or sheath 20, which does not require bolting.

According to one embodiment of the invention, the cutting blade is freely rotatable about its axis and the cutting device lacks means for rotating the cutting blade. According to this embodiment, the cutting device does not have, for example, a motor or other similar means for rotating the cutting blade. In this case, the object to be cut, i.e. the ring, is not considered to be a means for rotating the cutting blade even though the ring is rotated to rotate the cutting blade. In one embodiment, the device may be provided with means, such as a motor for rotating the cutting blade, but then the blade 30 is rotated relatively slowly, preferably at substantially the same speed as the cutting ring, so that cutting is based on shear-like shear. In this case, the rotatable blade can also serve as a means for rotating the tire. The serration or other pattern provided along the cutting edge of the blade thus enhances the friction required to rotate the ring. Even when using a serrated cutting edge, the operation of the device is based on the shear force between the 5 blades and the counterpiece.

According to one embodiment of the invention, the cutting device comprises two blade units. According to a very preferred embodiment, the blade units are arranged such that both sidewalls of the ring can be cut off simultaneously by rotating 10 cutting rings one turn. According to another embodiment, the cutting device comprises three or four blade units.

According to one embodiment of the invention, the means for rotating the ring comprises a gripping member for engaging the ring and means for rotating the gripping member 15. The gripping means can be manufactured in a variety of structures. The purpose of the gripping member is to grip the tire firmly so that the ring can be rotated relative to the cutting unit. Examples of means for rotating the ring and gripping means are disclosed, inter alia, in the prior art publications cited in this application.

20

The device and method according to the invention provide a very neat cutting imprint so that no sharp metallic ends of reinforcing yarns protrude from the cutting surface. By using the device and method of the invention, the formation of noise, rubber and metal dust and other trimmings can be significantly reduced or even completely avoided.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be described in more detail with reference to the accompanying schematic drawing in which

Figure 1 shows a ring cutting device according to a first embodiment of the invention, 7

Fig. 2 shows a cutting unit of a cutting device similar to the example of Fig. 1, Fig. 3 shows a cutting unit of Fig. 2 as viewed perpendicular to the axis of rotation of the cutting blade,

Figure 4 shows the blade unit of Figure 3 with the entire unit rotated from the position of Figure 3 5,

Figure 5 is a perspective view of how the sidewall of a car tire is cut with a cutting device according to an embodiment of the invention,

Figure 6 illustrates how the side wall is cut with a cutting unit blade unit according to an embodiment of the invention,

Fig. 7 shows two cutting unit blade units for cutting the sidewalls of a tire, and

Fig. 8 is a view of the position of Fig. 7, viewed perpendicular to the rotation axes of the cutting blades.

15

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Figure 1 shows a ring cutting device according to a first embodiment of the invention. The apparatus has means for rotating the ring 1, which in this example comprises gripping means 18 for engaging the ring. The gripping means 18, and thus also the ring 1, can be rotated, for example, by means of an electric motor (not shown). The cutting device of the example comprises two blade units 7, 7a for simultaneously cutting both side walls of the ring. The tip portions 15, 15a of the blade unit counterparts are sharp and partially arranged through the side wall of the ring 1. The ring 1 is rotated with respect to the cutting unit blade units 7, 7a so that the ring sidewall wedges between the cutting blade 8, 8a and the counterpiece 14, 14a by rotating the cutting blade so that a cutting force is applied to the sidewall of the ring.

30

Fig. 2 is a view of the cutting unit of the cutting device of the example of Fig. 1, viewed from the direction of rotation axis 10 of the cutting blade 8. It comprises a body 11, 8 in connection therewith a disc-shaped cutting blade 8 arranged via a shaft 10 and a bearing, which is rotatable about its axis 10. The cross-section of the cutting edge 9 of the cutting blade in a plane perpendicular to the axis is substantially circular. Preferably, the device according to the invention does not have 5 power sources, such as a motor for rotating the blade 8. In the preferred embodiment, the blade unit body 11 shown in the figure forms part of the entire cutting unit body. The body of the shaving unit may also be formed by a suitably shaped counterpart. The counterpiece 14 is arranged to be stationary with respect to the body 11, in this example it is secured to the body by bolts 16. 10 The circumference, i.e. the cutting edge 9, of the circular cutting blade 8 is partially overlapping the cutting edge 17 of the counterpart.

Fig. 3 shows the blade unit of Fig. 2 as viewed perpendicular to the axis of rotation 10 of the cutting blade 8. The figure shows a disc-shaped cutting blade 8 which is fixed to the body 11 by means of an axis 10 and a bearing 12, so that the blade 8 is freely rotatable with respect to the body and the counterpart 14. The cutting edge 9 of the cutting blade is arranged very close to the cutting edge 17 of the counterpiece. Preferably, the cutting edges 9, 17 are in contact with each other, but for the sake of clarity they are drawn slightly apart in the figure.

Figure 4 shows the blade unit of Figure 3 when the whole unit is the situation of Figure 3 turned about the blade rotation 10 by 90 degrees clockwise when viewed from the direction of the arrow 31. The cutting edge 9 of the cutting blade is in very close proximity, typically in contact with the cutting edge 17 of the counterpiece. For example, the cutting edges of scissor blades are typically in similar contact with one another. As the cutting blade 8 is rotated, a shearing force similar to that of the shear blades 30 is generated between its cutting edge 9 and the cutting edge 17 of the counterpiece 14. In this example, the angle α of the cutting edge of the cutting blade is about 30 ° and the angle of the cutting edge β of the counterpiece is about 65 °.

9

Fig. 5 is a perspective view showing how the sidewall 2 of a car tire 1 is cut by a cutting device according to an embodiment of the invention. In the example shown in the figure, only one blade unit 7 is shown. According to a preferred embodiment, the device also comprises a second blade unit and means 5 for rotating the ring. The counterpiece 14 has a pointed tip portion 15 and thereby allows the counterpiece to be partially arranged through the sidewall 2 of the ring inside the ring so that the sidewall of the ring is adjacent to the piercing point 20 between the cutting blade 8 and the counterpart 14. When the tire 1 is rotated to the blade unit 7 with respect to the direction of arrow 32 direction of the tire side wall February 10 wedged cutting blade 8 and the counterpart 14, whereby the friction between the rotary ring and the cutting blade 8 also rotates the cutting blade of the arrow 33 direction so that a tire side wall of between the cutting blade and the counterpart cutting edge the shear force.

Figure 6 shows in a direction perpendicular to the sidewall 2 of the ring how the sidewall is cut by a cutting unit blade unit according to an embodiment of the invention. The counterpart 14 is partially arranged through the sidewall 2 of the ring inside the ring so that the sidewall of the ring is adjacent to the piercing point between the cutting blade 8 and the counterpart 14. 20 The ring is rotated 34 in the direction of the arrow so that the side wall 2 of the wedged cutting blade 8 and the counterpart 14, whereby the tire also rotates the cutting blade 8, so that between the cutting blade and the counterpart cutting edges 9, 17 consists of a ring side wall of the cutting shear, cutting the latter of which resulting 5 shows the side wall 2 In the radial direction of the tire, it is possible to select at which point the side wall 2 is to be intersected between points A and B, where B is the part of the side wall closest to the tread 3.

Fig. 7 shows two blade units 7, 7a of the cutting device 30 in a direction perpendicular to the tire tread 3 and in the direction of the cutting blade shafts 10, 10a for cutting the tire sidewalls 2, 2a. The curvature of the tire tread 3 cannot be seen in the figure. Arrows 35 and 36 show in which direction the blades rotate as the ring is rotated.

10

The dashed portions of the mounts are arranged through the sidewall of the tire on the inside of the tire. A sharp tip portion 15, 15a is provided at both ends of the counterparts. Hereby, the counterpieces of the two blade units can be interchanged because their cutting edges 17, 17a are arranged to wear in the longitudinal direction of the counterpiece outside the center. To facilitate the replacement and installation of the counterpieces, they are fixed to the shaving unit body with only one bolt.

Fig. 8 shows the situation of Fig. 7, viewed in a direction perpendicular to the rotation axes 10, 10a 10 of the cutting blades. The side walls 2, 2a of the ring wedge between the cutting edges 20, 20a of the cutting blade 8, 8a and the counter piece 14, 14a, whereby a shear force is applied to the side wall as the blade rotates.

The figures show preferred embodiments of the invention. The figures do not explicitly disclose matters of secondary importance, known per se, or obvious to one skilled in the art. It is to be understood that the invention is not limited to the above examples, but may vary within the scope of the following claims. The dependent claims 20 disclose some possible embodiments of the invention and as such should not be construed as limiting the scope of the invention.

Claims (11)

A tire cutting device comprising: - a body (11), 5 - at least one bite unit (7, 7a), comprising - a cutting bite (8, 8a) which can be rotated about its axis (10, 10a) and which via it is arranged in connection with the body (11), which cutting bite has a cutting edge (9), and - a counterpart (14, 14a) comprising a cutting edge (17, 17a) and which counterpart is arranged in connection with the cutting bed, the sidewall (2) of the tire (1) being cut may be arranged between the cutting bed and the counterpiece, and - means for rotating a tire relative to the bed unit, and said cutting bed can be rotated relative to the counter piece so that it is between the cutting bed cutting edge (9) and cutting edge (17) of the counterpart exaggerate cutting force, characterized in that the counterpart (14, 14a) is elongated and at the end of the counterpart a sharp tip portion (15, 15a) is arranged to provide the counterpart at least partially through the side wall of the tire. (2, 2a). 20 Tire cutting device according to claim 1, characterized in that the piece fastened in connection with the cutting bed can be arranged partially through the tire side wall into the tire. Tire cutting device according to claim 1 or 2, characterized in that the intersection of the cutting edge (9) in the direction of the plane perpendicular to the axis of rotation (10, 10a) is essentially in the form of a circle. Tire cutting device according to any of the preceding claims, characterized in that the counterpart (14, 14a) can be arranged in connection with the cutting bite (8, 8a) to be immobile in relation to the body of the device. A tire cutting device according to any of the preceding claims, characterized in that the cutting bit (8, 8a) can rotate freely around its axis (10, 10a) and that the cutting device has no means for rotating the cutting bit. 5 Tire cutting device according to any of the preceding claims, characterized in that it comprises two bite units (7, 7a). Tire cutting device according to any of the preceding claims, characterized in that the means for rotating the tire (1) comprises a gripping means (18) for gripping the tire and means for rotating the gripping means. A method of cutting a sidewall of a tire with a cutting device, the device comprising 15. a frame (11), - at least one bait unit (7, 7a), comprising - a cutting bite (8, 8a) which can be rotated around its shaft (10, 10a) and arranged via it in connection with the body (11), said cutting bite having a cutting edge (9), 20. a counterpart (14, 14a) arranged in connection with the cutting bite, so that the sidewall (2, 2a) of the tire to be cut may be arranged between the cutting bed and the counterpiece, - means for rotating a tire (1) in the relative tilting unit, characterized in that the elongated counterpiece 25 is provided with a fixed tip portion, by means of of which the counterpart (14, 14a) is provided at least partially through the tire sidewall (2, 2a), and - the tire (1) to be cut is rotated relative to the cutting unit's bite unit (7, 7a) so that the tire sidewall (2 2a) is wedged between cutting bites (8, 8a) and the counterpart and rotates the cutting bite such that between the cutting bed and the elongated counterpart (9, 17), a cutting force acts up and acts against the tire sidewall and cuts it. 9. A method according to claim 8, characterized in that the counterpart attached in connection with the cutting bed is partially arranged through the sidewall of the tire into the tire. Method according to Claim 8 or 9, characterized in that said cutting device comprises weft units (7, 7a), by means of which the bed side walls (2, 2a) of the tire (1) are cut simultaneously. Use of the tire cutting device according to claim 1 in cutting tires (1).