JPH03183521A - Extrusion molding method and its device for coating - Google Patents

Abstract

PURPOSE:To make the cost of plant and equipment inexpensive and enable the best factory layout, by a method wherein a feed speed of a shaft is changed to a low speed, a resin molded body is stuck to an adhesive part of the shaft, and the resin molded body is left behind on the adhesive part by cutting the same with a cutter. CONSTITUTION:A resin molded body 14 is extrusion-molded of a plurality of cylindrical resin strips into a form where the strips are stood in a raw cylindrical and a hollow part 18 is formed with a core metal 5. A feed speed of a shaft 13 is changed over to a high speed, nonadhesive part 16 is passed through the hollow part 18 at a high speed and projected by an appropriate length from a front end face of the hollow part 18. When the feed speed of the shaft 13 is changed over to a low speed and the resin molded body 14 is stuck to the adhesive part 15 extending over the whole length, the resin molded body 14, which is stuck is cut off with a cutter 7 and left behind on the adhesive part 15 and a section is molded into a fixed form. Since simultaneously with cutting the feed speed of the shaft 13 is changed over to the high speed and a cutter holder 10 is moved in the same direction and at the same speed with those of the shaft 13 in alignment with the shaft 13, the cutter 7 is separated from the resin molded body 14 which is extruded away in succession.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a coating extrusion molding method and apparatus for forming a resin-attached area and a non-adhered area on the outer periphery of a shaft, and is particularly applicable to electronic copying machines, printers, etc. It is suitable for manufacturing magnetorol, etc., which are used.

[Prior Art and Problems] Conventionally, in order to manufacture products such as the above-mentioned mag untrol in which a resin adhered part and a non-adhered part are formed on the outer periphery of a shaft, a resin molded body extruded into a strip shape has been extruded into a predetermined shape. They have been manufactured by cutting to length and gluing a plurality of strips to the outer periphery of the shaft, or by cutting an extruded resin molded body into a cylindrical shape to a predetermined length, inserting the shaft into the hollow hole, and gluing.

However, these conventional methods require specialized equipment for assembling the resin molding and the shaft and for winding the resin molding onto reels for transportation and storage, which is disadvantageous in terms of equipment costs and factory layout. There was a problem that. Also,
Contamination of resin moldings and failure of assembly equipment due to the use of adhesives,
Furthermore, there were problems such as staining of the resin molded body due to cutting chips during cutting.

The present invention aims to improve the conventional method and solve the above problems.

[Means for solving problems]

That is, the first aspect of the present invention is a method for forming a resin-attached part and a non-adherent part on the outer periphery of a shaft, in which a hollow resin is removed from an extrusion die for acid molding while inserting the shaft at a feeding speed that can be switched between high and low speeds. When extruding the molded body to form a non-adherent part, the feeding speed of the shaft is changed to high speed to prevent the resin molded body from adhering to the non-adhesive part of the shaft, and the non-adhesive part is extruded from the end face of the hollow part. A non-adhesive part is formed by protrusion, and when an adhering part is formed, the feeding speed of the shaft is switched to a low speed to make the resin molding adhere to the adhering part of the shaft, and the resin molding is cut with a cutter. Coating extrusion is characterized in that the adhesion part is formed by simultaneously leaving the adhesion part at the adhesion site, switching the feeding speed of the shaft to high speed, and moving the cutter in synchronization with the shaft in the same direction and at the same speed. molding method,
The second aspect of the present invention is an extrusion molding die that is provided with a mandrel having a shaft feeding hole in the center concentrically within a resin extrusion passage in an apparatus for forming resin-attached parts and non-adhered parts on the outer periphery of a shaft. a shaft feeding device that inserts the shaft into the shaft feeding hole at a feeding speed that can be switched between high and low speeds; The coating extrusion molding apparatus is characterized in that it is equipped with a cutter that cuts the resin molded article and leaves it at the attachment site, and at the same time moves in the same direction and at the same speed in synchronization with the shaft. It is something to do.

[Effect]

According to the present invention, in order to form resin-attached parts and non-adhered parts on the outer periphery of the shaft, the resin molded body is extruded from the resin extrusion passage of the extrusion molding die, and at the same time, the shaft is fed to the mandrel by the shaft feeding device. Insert into the hole. A hollow part is formed in the resin molded body by a mandrel, and the shaft exits the shaft feeding hole and is inserted into the hollow part. When forming the non-adherent portion, the feeding speed of the shaft is switched to high speed to prevent the resin molded body from adhering to the non-adhesive portion of the shaft, and the non-adhesive portion is made to protrude from the end face of the hollow portion. . Thus, a non-adherent portion is formed. In addition, when forming the adhering part, the resin molded body is attached to the adhering part of the shaft by switching the feeding speed of the shaft to a low speed, and then the adhering resin is At the same time as cutting the compact and leaving it at the attachment site, the feed speed of the shaft is switched to high speed, and the cutter is moved in the same direction and at the same speed as the shaft in synchronization with the shaft, so that the cutter is continuously pushed out. M is removed from the coming resin molded body. Thus, an adhesion is formed.

The present invention does not require an assembly device for assembling the resin molded body and the shaft or a reel winding device for the resin molded body, and does not use an adhesive for assembling the resin molded body and the shaft, unlike the conventional art. Furthermore, the resin molded body is cut before the resin hardens. Therefore, no chips are generated. Therefore, the conventional problems are completely solved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2, but the scope of the present invention is not limited in any way by this embodiment.

In FIGS. 1 and 2, (1) is an extrusion molding die, which has a resin extrusion passage (2) formed inside thereof, and is fitted into a die holder (3).

The die holder (3) is provided with a resin supply path (4) that communicates with the resin extrusion path (2) in a direction perpendicular to the resin extrusion path (2). (5
) is a mandrel placed concentrically within the resin extrusion channel (2), has a shaft feed hole (6) in the center, and has a base screwed onto the die holder (3). Resin extrusion passage (2)
The outlet of the shaft feed hole (6) is opened around the protrusion of the shaft feed hole (6).

(7) is a cutter disposed on the exit side of the resin extrusion passageway (2), and has a cutting edge (8) that cuts a resin molded body (14), which will be described later, and simultaneously shapes the cut surface into a predetermined shape;
A plurality of cutter holders (10) are supported by a cutter holder (10) through long holes (9) provided in the base so as to be movable in the radial direction with respect to the axis of the mandrel (5). The cutter holder (10) is
It has a guide hole (11) for the resin molded body in the center and is supported by a plurality of guide bars (12N) so as to be movable in the axial direction of the mandrel (5). ;1
Although it is not equipped with a shaft feeding device and a shaft preheating device. The shaft feeding device is a device that inserts the shaft (13) into the shaft feeding hole (6) at a feeding speed that is switched between high and low speeds. Further, the shaft preheating device is a device that preheats the shaft (13) to the optimum temperature for resin adhesion. In addition, when the cutter holder (10) moves in the same direction as the shaft (13), the cutter holder (10) is arranged so that it can move in sync with the shaft (13) at the same speed as the high-speed feeding speed of the shaft (13). Adjust to.

Next, by using the apparatus having the above-mentioned configuration, an attached part (15) of the resin molded body (14) is formed at the center of the outer periphery of the shaft (13), and non-adhered parts (16) and (17) are formed at both the front and rear ends thereof. The method will be explained, and when referring to the attached portion and non-attached portion of the shirt 1-(13) itself, the corresponding attached portion and non-attached portion are placed in parentheses [ ] and τ is not indicated.

First, the shaft preheating device preheats the 44 attachment parts [15] of the shaft 13 to the optimum temperature for resin adhesion, and the non-adhesion parts [Eng.
After preheating to a temperature of about
Connect the shaft (13) to the shaft feeding hole (6) of the mandrel (5).
Insert into. On the other hand, resin is supplied L7 from an extruder (not shown) to the resin supply path (4) of the die holder (3), and the resin molded body (14) is extruded from the resin extrusion path (2) of the die (1). The resin molded body (14) is extruded into a cylindrical shape, a shape in which a plurality of resin strips are arranged in a cylindrical shape, etc.
A hollow portion (18) is formed by the mandrel (5). The shaft (13) exits the shaft feed hole (6) and is inserted into the hollow part (18).

Then, first, a non-adherent portion 06) is formed.

At this time, the feeding speed of the shirt (13) is switched to high speed, and the non-adhesive part [16] passes through the hollow part (18) at high speed and extends an appropriate length from the front end surface of the hollow part (1). only stands out. The non-adherent area [16] is simply preheated to below the resin adhesion temperature, and the hollow area (18) is heated at high speed.
, so the resin molded body (14) does not adhere to the outer periphery.

In this way, a non-adherent portion (16) is formed (see FIG. 1).

Subsequently, the attachment portion (15) is formed. At this time, as shown in FIG. 1, the cutter (7) is opened at the position closest to the die (1), and the feeding speed of the shaft (13) is switched to a low speed. Since the attachment part [15] is preheated to the optimum resin attachment temperature, the resin molded body (14) adheres to the outer periphery as it is inserted into the hollow part (18) at a low speed. The resin molded body (14) has a guide hole (11
> while being guided by the attachment site [15]. When the resin molded body (14) is attached to the entire length of the attachment site [15], the cutter (7) cuts the attached resin molded body (14) to the attachment site [15], as shown in Fig. 2. At the same time, the cut surface is formed into a predetermined shape. At the same time as cutting, the feeding speed of the shaft (13) is switched to high speed, and the cutter holder (10) moves in the same direction and at the same speed as the shaft (13) in synchronization with the shaft (13), so that the cutter (7) is then separated from the extruded resin molded body (14). The cutter (7) opens when the resin on the cutting surface hardens, and is returned to its original position as shown in FIG. 1 by the cutter holder (10). Thus, the attachment part (
15) is formed.

A non-adherent portion (17) is formed in Ruk. That is,
In forming the attachment portion (15), the shaft (13)
As the feeding speed of
7] also passes through the hollow part (18) of the subsequent resin molded body (14) at high speed. Therefore, for the same reason as the non-adhesion part (16), this non-adhesion part (17) also has a resin molded body (
14) will not adhere, thus the non-adherent site (
17) is formed.

In this embodiment, by repeating the above-described series of operations, the adhered part (15) and non-adhered parts (16) and (17) of the resin molded body (14) are formed on the outer periphery of the shirt (13). Once formed, it can be mass-produced automatically.

〔Effect of the invention〕

Since the present invention is configured as described above, extrusion molding of a resin molded body, attachment to a shaft, and cutting with a cutter can be performed as a series of operations. Therefore, there is no need for an assembly device for the resin molded body and the shaft, or a reel winding device for the resin molded body, unlike in the past, and therefore, equipment costs can be kept low and an optimal factory layout can be achieved. Furthermore, since no adhesive is used to attach the resin molded body to the shaft, and the resin molded body is cut before the resin hardens, no chips are generated. Therefore, failure of the device due to the adhesive and staining of the resin molded body due to the adhesive and chips are eliminated.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing one embodiment of the method and apparatus of the present invention, and FIG. 1 is a sectional view when the shaft feeding speed is low;
FIG. 2 is a cross-sectional view when the shaft feeding speed is high. 1...Dice, 2...4M fat extrusion passage 5...
- Mandrel, 6... Shaft feed hole 7... Cutter, 13... Shaft 14... Resin molded body, 15
... Adhesive part [15] ... Adhesive part, 16... Non-adherent part [16] ... Non-adherent part, 17... Non-adherent part [17] - Non-adherent part, l 8 ・ ・hollow part

Claims (1)

[Claims] 1. In a method for forming resin-attached parts and non-adhered parts on the outer periphery of a shaft, a hollow resin molded body is inserted from an extrusion molding die while inserting the shaft at a feeding speed that can be switched between high and low speeds. When extruding the resin to form a non-adhesive part, the shaft feeding speed is changed to high speed to prevent the resin molded body from adhering to the non-adherent part of the shaft, and the non-adherent part is made to protrude from the end face of the hollow part. By doing this, a non-adhesion part is formed, and when forming an adhesion part, the feeding speed of the shaft is switched to a low speed and the resin molded body is adhered to the adhesion part of the shaft,
The resin molded body is cut with a cutter and left at the attachment site, and at the same time, the feeding speed of the shaft is changed to high speed, and the cutter is moved in the same direction and at the same speed as the shaft in synchronization with the shaft to remove the attachment area. A coating extrusion molding method characterized by forming. 2. In an apparatus for forming a resin-adhered part and a non-adhered part on the outer periphery of a shaft, an extrusion molding die having a mandrel having a shaft feeding hole in the center concentrically in a resin extrusion passage;
A shaft feeding device that inserts the shaft into the shaft feeding hole at a feeding speed that can be switched between high and low speeds, and a shaft feeding device that is arranged on the exit side of the resin extrusion passage, and a resin that is extruded from the exit and adheres to the attachment site of the shaft. A coating extrusion molding apparatus comprising: a cutter that cuts the molded article and leaves it at the attachment site, and at the same time moves in synchronization with the shaft in the same direction and at the same speed as the shaft.