JP4714555B2 - How to clean the roller core groove - Google Patents

Description

  The present invention relates to a method for removing a hardened material in a circumferentially extending groove provided at an end of a cored bar of a roller to clean the groove, and more particularly to an apparatus that can be cleaned efficiently and cleanly.

Formed by dispersing bubbles in a liquid resin or rubber material by mechanical flossing as a method of manufacturing an elastic roller that is used as a charging roller, developing roller, etc. for copying machines and printers and has an elastic layer around the shaft. The liquid foam thus prepared is poured into a cylindrical mold, and the mold is filled with the liquid foam, and then heated and cured (for example, see Patent Document 1), or a foamable resin or A method of forming an elastic layer by injecting a rubber material into a cylindrical mold and heating and foaming and vulcanizing the mold within the mold is known.
JP 2001-129835 A

  FIG. 1 is a view showing a conventional mold used for forming such a roller. FIG. 1 (a) is a sectional view of a main body mold, and FIG. 1 (b) is a sectional view of a shaft end resin mold. FIG. 1 (c) shows a front view of the shaft end resin mold, and a molding die 90 is a core metal 92 having a cavity 91 corresponding to the elastic layer and a core metal for fixing the end of the core metal 99. It has at least one (two in the figure) shaft end resin mold 94 having a support portion 93 and specifying the longitudinal end surface 98 of the cavity 91, and at least one of the shaft end resin molds 94 is provided in the main body mold 92. And an opening space 95 that accommodates the material in the length direction of the cavity 91, and a gate portion 96 for injecting the material is provided in at least one shaft end resin mold 94.

  However, as shown in FIG. 2 (a), using such a conventional mold 90, a resin or rubber material is injected around a cored bar having a groove extending in the circumferential direction at the end. When forming a roller, since there is a gap CL between the outer peripheral surface of the cored bar 99 and the inner peripheral surface of the cored bar support part 93, the material injected into the cavity 91 at a high pressure is The material M that reaches the groove portion 97 through the gap CL and enters the groove portion 97 is cured by heat, and is taken out from the forming die 90 as shown in FIG. In the product roller having the elastic layer 89 formed around the central portion in the direction, the groove 97 is filled with the material M, and cannot perform the original function of locking the E-ring, for example. There was a problem.

  The present invention has been made in view of such a problem, and efficiently removes a resin or rubber material cured in a circumferentially extending groove provided at an end of a roller metal core. Then, it aims at providing the method of cleaning a groove part.

<1> The present invention relates to a method of removing a cured resin or rubber material in a circumferentially extending groove provided at an end of a core metal of a roller and cleaning the groove,
The wire is stretched in a direction perpendicular to the core bar, and a wire having a diameter smaller than the groove width of the groove is digged into the groove, the elastic roller is rotated, or the wire is reciprocated in the length direction to reciprocate the groove bottom. And the wire are relatively displaced to scrape off the material.

  <2> The present invention is the method for cleaning a roller cored bar groove part according to <1>, wherein the diameter of the wire is 0.1 to 0.9 times the groove width of the groove part.

  According to the invention of <1>, the wire is stretched in a direction perpendicular to the cored bar and has a diameter smaller than the groove width of the groove, and the elastic roller is rotated or the wire is lengthened. Since the material is scraped off by reciprocally displacing the groove in the direction and scraping the material, the resin or rubber material (material waste) hardened in the groove can be efficiently and automatically removed in a short time. Can be removed.

  According to <2>, since the diameter of the wire is 0.1 to 0.9 times the groove width, the material hardened in the groove can be more effectively removed, and the wire diameter is 0.1 times the groove width. If it is less than, scraping is insufficient and satisfactory cleaning performance cannot be obtained. On the other hand, if it exceeds 0.9 times, there is no escape place for material residue and material residue remains. .

  FIG. 5 is a side view showing a roller to be cleaned according to the present invention. The roller 10 includes a cored bar 1 and an elastic layer formed around a central part in the length direction of the cored bar 1 using a molding die. 2 and configured. Here, depending on the type of the roller 10, one or more layers may be disposed on the outer periphery of the elastic layer 2.

  FIG. 3 is a conceptual diagram for explaining a first embodiment of a method for cleaning the material M hardened in the groove portion 4, in which FIG. 3A is a side view showing an end portion of the roller 10, FIG. 3B is a cross-sectional view corresponding to the b1-b1 arrow in FIG. 3A. This cleaning method is such that both ends are locked by pins 6 in a direction perpendicular to the core metal 1 and stretched. Then, the wire 5 having a diameter smaller than the groove width of the groove portion 4 is digged into the groove portion 4, the roller 10 is reciprocally rotated by a predetermined angle in both forward and reverse directions, and the groove portion 4 and the wire 5 are relatively displaced, so that the material M Is to scrape off.

  The wire may be made of metal such as brass or SUS, or may be made of resin such as nylon or polyester. Natural fibers such as cotton can also be used in the same manner. The twisted structure of the wire is not particularly limited, and may be a single wire or a plurality of twisted filaments.

  Also, the relative speed between the wire and the groove should be 0 to 100 mm / s. If the relative speed is too higher than 100 mm / s, sufficient friction cannot be obtained between the material residue and the wire. , Cleaning performance decreases. Also, the wire should swing in the length direction of the roller, which can improve the cleaning performance.

  FIG. 4 is a conceptual diagram for explaining a second embodiment of a method for cleaning the material M hardened in the groove portion 4, and FIG. 4A is a side view showing an end portion of the roller 10, 4B is a cross-sectional view corresponding to the arrow b2-b2 in FIG. 4A. In this cleaning method, both ends are wound around the drive drum 8 in a direction perpendicular to the core metal 1 and are stretched. The wire 7 having a diameter smaller than the groove width of the groove portion 4 is digged into the groove portion 4, and the driving drum 8 is reciprocally rotated by a predetermined angle in both forward and reverse directions while the roller 10 is fixed and held. 7 is reciprocally displaced left and right, and the groove 4 and the wire 5 are relatively displaced to scrape off the material M. In the figure, 9 is a tensioner for adjusting the tension of the wire 7. Also in this embodiment, the preferable conditions for cleaning, such as the properties of the wire, are as described in the first embodiment, and detailed description thereof is omitted.

  As described above, according to the present invention, the material injected into the cavity of the mold and protruding from the gap between the shaft end resin mold and the core metal and having flowed into the groove is cured in the groove, and the groove has the original function. It was made in order to solve the problem that it cannot be demonstrated, and as a premise, it was made on the assumption that the conventional mold could not be modified, but under other circumstances Then, the above-mentioned problem can be solved by an approach different from the present invention, and can be achieved, for example, by changing the configuration of the shaft end resin mold.

  FIG. 6 is a cross-sectional view showing a shaft end resin mold devised based on such an approach. The mold 20 includes a body mold 12 having a cavity 11 corresponding to the elastic layer 2 of the roller, a cavity 11, each of the shaft end resin molds 14 that specify both end faces in the length direction. The shaft end resin mold 14 includes a core metal support portion 13 that supports the end portion of the core metal 1. 13, a ring-shaped protrusion 15 projecting radially inward is provided at a longitudinal position corresponding to the groove 4 on the inner peripheral surface corresponding to the outer peripheral surface of the core metal end portion, and supports the core metal 1 When inserted into the portion 13, the projection 15 fits into the groove portion 4, and the groove portion 4 is configured to be sealed by the projection 15. With this configuration, between the core metal 1 and the core metal support portion 13. Preventing material from entering the groove 4 from the formed gap CL Kill.

  Here, when the width of the groove 4 is W and the depth is D, it is preferable that the width of the protrusion is 0.9 to 1.05 times W and the height is 0.1 to 0.8 times D. Adhesion to can be ensured.

  And the countermeasure which provides the processus | protrusion 15 in the shaft end resin type | mold 14 makes the cleaning of the groove part 4 unnecessary, and this can also exhibit the original function of the groove part 4 in a product roller.

  The present invention can be applied to various elastic rollers having an elastic layer. Examples of such an elastic roller include a charging roller for charging a photosensitive drum, and non-elasticity depending on a latent image formed on the photosensitive drum. Examples thereof include a developing roller that transfers magnetic toner, a toner supply roller that supplies toner to the developing roller, and a transfer roller that transfers toner on the photosensitive drum to printing paper.

It is sectional drawing and the side view which show the conventional shaping | molding die. It is sectional drawing and a side view which show the axial end part of the roller formed using the conventional shaping | molding die. It is a conceptual diagram for demonstrating 1st embodiment which concerns on this invention. It is a conceptual diagram for demonstrating 2nd embodiment which concerns on this invention. It is a side view which shows the roller cleaned using the cleaning method of the core metal groove part of this invention. It is sectional drawing which shows the shaping | molding die concerning another approach from this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal core 1A, 1B Metal shaft end 2 Elastic layer 4 Groove 5 Wire 6 Pin 7 Wire 8 Drive drum 9 Tensioner 10 Elastic roller 11 Cavity 12 Body mold 13 Core metal support part 14 Shaft end resin mold 15 Protrusion 20 Molding Mold CL Clearance M Material

Claims (2)

In the method of cleaning the groove part by removing the cured resin or rubber material in the circumferentially extending groove part provided at the end of the roller metal core,
The wire is stretched in a direction perpendicular to the core bar, and a wire having a diameter smaller than the groove width of the groove is digged into the groove, the elastic roller is rotated, or the wire is reciprocated in the length direction to reciprocate the groove bottom. And a method of cleaning a roller core groove portion that scrapes off the material by relatively displacing the wire and the wire.   The roller cored bar groove cleaning method according to claim 1, wherein a diameter of the wire is 0.1 to 0.9 times a groove width of the groove.

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