Method for fixing resin tube to die and manufacturing method for resin-tube covered roller

Patent metadata

Field	Value
Publication number	US-10974491-B2
Application number	US-201816213767-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	Oct 30, 2015
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

One end portion of a resin tube kept in a diameter expanded state by a plurality of diameter expanding claws is disengaged from the diameter expanding claws and is shifted onto an outer peripheral surface of a die by applying a pressing force toward the other end portion of the resin tube to an end surface of the one end portion of the resin tube.

First claim

What is claimed is:

1. A manufacturing method for a resin-tube covered roller including a cylindrical or columnar base, an elastic layer provided on a peripheral surface of the base and containing rubber, and a surface layer formed by a resin tube configured to cover a peripheral surface of the elastic layer, the manufacturing method comprising:
(1) a step of producing a cylindrical die having an inner peripheral surface covered with the resin tube by a method for fixing the resin tube inserted in the cylindrical die to the die comprising:
(a) placing the resin tube inside the cylindrical die so that both end portions of the resin tube protrude from both ends of the die; and
(b) folding back the end portions of the resin tube protruding from the both ends of the die onto an outer peripheral surface of the die,
wherein the step (b) includes the following steps (i), (ii), and (iii):
(i) providing a diameter expanding unit having a plurality of diameter expanding claws which are movable in a radial direction between a diameter reduced position to be insertable in the resin tube and a diameter expanded position to extend the resin tube so that an inner diameter of the resin tube is larger than an outer diameter of the die, and which extend in an axial direction orthogonal to the radial direction;
placing the diameter expanding unit so that the axial direction is substantially parallel to a center axis of the die;
inserting the diameter expanding claws at the diameter reduced position into one end portion of the resin tube protruding from one of the ends of the die; and
moving the diameter expanding claws to the diameter expanded position to expand a diameter of the one end portion of the resin tube so that an inner diameter of the one end portion is larger than the outer diameter of the die;
(ii) moving the diameter expanding unit and the die relative to each other so that the diameter expanding unit approaches the other end portion of the resin tube while keeping the one end portion of the resin tube in a diameter expanded state by the diameter expanding claws; and
(iii) applying a pressing force toward the other end portion of the resin tube to an end surface of the one end portion of the resin tube; disengaging the one end portion of the resin tube kept in the diameter expanded state with the diameter expanding claws from the diameter expanding claws; and shifting the one end portion of the resin tube onto the outer peripheral surface of the die, and
(2) a step of forming the elastic layer by fixing the base in a hollow portion of the cylindrical die having the inner peripheral surface covered with the resin tube so that the base is substantially concentric with the die, pouring an uncured material into a cavity between an inner peripheral surface of the resin tube and an outer peripheral surface of the base, and curing the uncured material.

2. The manufacturing method for a resin-tube covered roller according to claim 1 ,
wherein step (iii) includes:
inserting a plurality of pressing claws extending in a direction substantially parallel to the axial direction between the diameter expanding claws at the diameter expanded position and bringing distal ends of the pressing claws into contact with the end surface of the one end portion of the resin tube; and
moving the pressing claws and the die relative to each other so that the pressing claws approach the other end portion of the resin tube to shift the one end portion of the resin tube onto the outer peripheral surface of the die.

3. The manufacturing method for a resin-tube covered roller according to claim 1 , wherein, in step (i), diameter expansion of the resin tube is performed while relatively moving the diameter expanding unit so that the diameter expanding unit approaches the other end portion of the resin tube.

4. The manufacturing method for a resin-tube covered roller according to claim 1 , wherein, in step (iii), the relative movement is stopped at a time when the one end portion of the resin tube is folded back so that the outer peripheral surface of the die is opposed to at least a part of an outer peripheral surface of the one end portion of the resin tube while the one end portion of the resin tube is kept in the diameter expanded state by the diameter expanding claws.

Assignees

• Canon Kk

Inventors

• Suzuki Takeshi
• Arai Yutaka
• Takahashi Masaaki
• Takada Shigeaki
• Asaka Akeshi
• Sasame Yukio
• Onuma Masayuki

Classifications

• B23P11/025

  by using heat or cold · CPC title

• G03G15/206

  Structural details or chemical composition of the pressure elements and layers thereof · CPC title

• B29D99/0035 Primary

  rollers or cylinders having an axial length of several times the diameter, e.g. for embossing, pressing, or printing · CPC title

• B23P11/00

  Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  (connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00) · CPC title

• B29C53/08 Primary

  of tubes {or other profiled members} · CPC title