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AssigneeVmi Holland B.V.
InventorWiebe Herman TEN WOLDE
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The invention relates to a belt and tread drum, an assembly of the belt and tread drum and a pressing device and to a method for manufacturing a belt and tread package, wherein the belt and tread drum comprises a first support member and a second support member, wherein each support member comprises a tread support surface which faces away from the drum axis for supporting the tread layer where said tread layer is wider than the belt layer, wherein each support member is positionable in a raised position outside the circumferential surface in the radial direction, wherein the belt and tread drum further comprises a first retaining element and a second retaining element for retaining the tread layer at the first support member and the second support member, respectively.
A drum for tire building comprising a pneumatic actuator for controlling a radial movement of an actuated drum part with respect to a reference surface of said drum, wherein the pneumatic actuator comprises a cylinder with a first flow channel at a first end of the cylinder and a second flow channel at a second end of the cylinder opposite to the first end of the cylinder, wherein the pneumatic actuator further comprises a piston which is movable back and forth within the cylinder between a first position at the first end of the cylinder and a second position at the second end of the cylinder, wherein the piston comprises a piston aperture extending through said piston, wherein the pneumatic actuator is arranged to allow a fluid to flow between the first flow channel and the second flow channel when the piston is in the first position or between the first position and the second position, and wherein the pneumatic actuator is arranged to block a fluid flow between the first flow channel and the second flow channel when the piston is in the second position.
A belt and tread drum for manufacturing a belt and tread package, wherein the belt and tread package comprises a belt layer and a tread layer that is wider than the belt layer, wherein the belt and tread drum has a circumferential surface that is rotatable about a drum axis, wherein the belt and tread drum comprises a first support member, wherein the first support member comprises a tread support surface which faces away from the drum axis for at least partially supporting the tread layer where said tread layer is wider than the belt layer, wherein the first support member is positionable in a raised position outside the circumferential surface in the radial direction, wherein the belt and tread drum further comprises a first retaining element for engaging onto the tread layer to retain the tread layer in position on the tread support surface at the first support member, wherein the belt and tread drum comprises a retaining pusher for pushing the first retaining element or a part associated with said first retaining element in the radial direction relative to the first support member, wherein the retaining pusher is a pneumatic actuator comprising a cylinder, a first flow channel at a first end of the cylinder and a second flow channel at a second end of the cylinder opposite to the first end of the cylinder, wherein the retaining pusher further comprises a piston which is movable back and forth within the cylinder between a first position at the first end of the cylinder and a second position at the second end of the cylinder, wherein the piston comprises a piston aperture extending through said piston, wherein the retaining pusher is arranged to allow a fluid to flow between the first flow channel and the second flow channel when the piston is in the first position or between the first position and the second position, and wherein the retaining pusher is arranged to block a fluid flow between the first flow channel and the second flow channel when the piston is in the second position.
Dependencies are inferred from the claim text.