JPS61130070A - Manufacture of platen roll for printer - Google Patents

Abstract

PURPOSE:To facilitate manufacture of a platen roll in a multilayer construction and enable the constitution of component layers to be changed, by a method wherein an unvulcanized rubber layer is provided around the outer periphery of a mandrel, the rubber layer is vulcanized to form a main body of a platen roll, a core body is press fitted into the main body, and the outer periphery of the main body is finished. CONSTITUTION:An unvulcanized inner layer rubber 2 is continuously extruded in a tubular form on the outer periphery of the mandrel 5 by an extruder 7a, and a sound-absorbing reinforcement layer 3 is continuously applied to the outer periphery of the rubber 2. Further, an unvulcanized outer layer rubber 4 is extruded on the outer periphery of the layer 3 by an extruder 7b to provide the continuous unvulcanized main body Ea of the platen roll. The main body Ea is cut to a predetermined length, which is covered by a covering material for vulcanization, and is vulcanized by heating under pressure in a vulcanizer. After vulcanization, the covering material 11, 12 is released, the mandrel 5 is removed by a stripping machine 4, the main body blank thus obtained is cut to a predetermined length by a cutter to obtain a main body Ec of the roll. The core body is press fitted into the main body Ec, and the outer peripheral surface of the body Ec is finished by an external cylindrical grinding machine or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a method for manufacturing a platen roll for a printer.

[Conventional technology]

Generally, platen rolls for printers are constructed by coating the outer periphery of a core body with high-hardness vulcanized rubber. Conventionally, the outer periphery of the core body is coated with uncured rubber using a molding method or an injection method. A method is used in which sulfuric rubber is molded, vulcanized, and then the outer peripheral surface is finished by cutting.

However, conventional manufacturing methods such as those described above can only produce one roll each.

Therefore, there are the following problems. That is, (al) The outer layer rubber must also be molded into individual lengths, which requires a large number of processing steps.

(bl As mentioned above, printer platen rolls with a so-called single-layer structure, in which the outer periphery of the core is simply coated with high-hardness vulcanized rubber, produce significant noise during printing.In order to eliminate this, sound absorbing It is necessary to manufacture rolls with an effective multilayer structure, but with the conventional manufacturing method described above, the process of laminating the sound absorbing layers is complicated, making it practically difficult to manufacture, and it is difficult to stabilize the quality. It's difficult.

[Purpose of the invention]

The present invention was developed as a result of studies to solve the above-mentioned problems.
It has been achieved.

Therefore, an object of the present invention is to be able to extremely easily manufacture a multilayered platen roll, which is difficult to manufacture using the conventional manufacturing method described above, and to easily change the contents of each constituent layer of the multilayered platen roll. It is an object of the present invention to provide a method for manufacturing a platen roll for a printer, which can be modified, greatly improve productivity compared to conventional manufacturing methods, and stabilize quality.

[Structure of the invention]

That is, in the present invention, an unvulcanized inner layer rubber is extruded into a tube shape around the outer periphery of a mandrel using an extruder, a sound absorbing reinforcing layer is applied to the outer periphery of this inner layer rubber, and an unvulcanized outer layer is further applied to the outer periphery of this sound absorbing reinforcing layer. After extruding rubber using an extruder to form a continuous unvulcanized roll body, this unvulcanized roll body is vulcanized, and then the mandrel is pulled out from this vulcanized roll body to form this continuous roll body. After cutting the vulcanized roll body into a predetermined length to obtain a platen roll body, the core is press-fitted into the platen roll body and bonded together, and then the outer peripheral surface is finished. The gist of this paper is a method for manufacturing a platen roll for printers, which is characterized by the following characteristics:

Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings.

FIGS. 1 to 8 are explanatory diagrams showing each step of the method for manufacturing a printer platen roll according to the present invention, and FIGS. 9 and 10 each show an example of a printer platen roll manufactured according to the present invention. FIG.

(1) First, as shown in FIG. 1, the drive device 6 supplies the mandrel 5 to the inner layer rubber extruder 7a at a predetermined speed, and the extruder 7a injects unvulcanized inner layer rubber onto the outer periphery of the mandrel 5. 2 is continuously extruded into a tube shape.

Note that the inner layer rubber 2 is made of a rubber-like elastic material with a large tan δ such as acrylic rubber, polynorbornene rubber, butyl rubber, etc., so that it can impart a cushioning effect to the roll, and the inner layer rubber 2 may be coated in a post-process. When the core body 1 is press-fitted, the core body 1 is prevented from moving unnecessarily.

In this embodiment, the mandrel 5 is made of synthetic resin such as nylon, rubber such as butyl rubber, or solid material such as iron. It is also possible to use a fluid instead.

(2) Next, the sound absorbing reinforcing layer 3 is continuously applied to the outer periphery of the unvulcanized inner rubber layer 2.

This sound-absorbing reinforcing layer 3 may be formed by braiding yarn A having excellent sound-absorbing and reinforcing properties such as nylon, polyester, or vinylon around the outer periphery of the inner rubber layer 2 using a braider 8, as shown in FIG. Figure 2 (as shown in bl, nylon,
A cloth 9 made of polyester, vinylon, etc. and having excellent sound absorbing and reinforcing properties may be spirally wrapped around the outer periphery of the inner rubber layer 2 using a wrapping machine 10.

(3) Furthermore, as shown in FIG.
A continuous unvulcanized roll main body Ea is formed by extruding the unvulcanized outer layer rubber 4 on the outer periphery of the roll body by extruding the unvulcanized outer layer rubber 4 using an outer layer rubber extrusion i7b.

Note that the outer layer rubber 4 is SBR or NBR.

A rubber-like elastic body such as NR having a hardness after curing of JTS A of 90° to 98° is used, and after vulcanization, it has an optimal surface hardness as a platen roll for a printer,
This is to provide excellent durability.

In addition, in the above-mentioned process, while continuously extruding the unvulcanized inner rubber layer 2 into a tube shape around the outer periphery of the mandrel 5, the sound absorbing reinforcing layer 3 is continuously formed around the outer periphery of the inner rubber layer 2 in accordance with the extrusion speed. It is also possible to carry out a continuous process in which the unvulcanized outer rubber layer 4 is extruded onto the outer periphery of the sound absorbing reinforcement N3 at this speed.

(4) Next, in this example, the unvulcanized roll body Ea formed as described above is cut to a required length,
After covering this outer peripheral surface with a vulcanizing coating material such as lead 11 as shown in Figure 4 (al) or wrapper 12 as shown in Figure 4 (bl), this is vulcanized as shown in Figure 5. The vulcanized roll body Eb is stored inside the vulcanizer IJ, 13, heated and pressurized to vulcanize it, and after a required period of time has elapsed, the vulcanized roll body Eb is taken out from the vulcanization can 13.

(5) After the vulcanization, the vulcanizing coating material 11 or 12 is peeled off from the outer peripheral surface of the vulcanized roll body Eb using a lead stripping machine or an unwrapping machine (not shown), and the mandrel 5 is After being pulled out by a stripping machine 14 as shown in FIG. 6, this continuous vulcanized roll body Eb is cut into a predetermined length by a cutting machine 15 as shown in FIG. 7 to form a platen roll body Ec. obtain.

(6) And inside this platen roll body Ec,
As shown in FIG. 8, the core body 1 is press-fitted using a press-fitting machine 16 and bonded together, and then the outer peripheral surface is finished using a cylindrical grinder or the like, thereby creating a printer with the structure shown in FIG. A platen roll E1 for use can be obtained.

The core body 1 is made of aluminum, free-cutting steel, or SUS, which has excellent workability, wear resistance, and the like.

The printer platen roll E1 shown in FIG. 9 manufactured by the above-mentioned processes includes an inner rubber layer 2 having a cushioning effect on the outer periphery of the core body 1. Sound absorption reinforcement N with sound absorption reinforcement effect
It has a multi-layered structure in which outer layer rubber 3 and outer layer 4, which is hard and has good printing effect and durability, are successively laminated, so that noise and impact during printing can be significantly reduced and it can be used for a long time. I can do it.

In addition, the printer platen roll E2 shown in FIG.
This is an example in which an inner rubber layer 2 having a cushioning effect and an outer rubber layer 4 which is hard and has a good printing effect and durability are sequentially laminated on the outer periphery of a core body 1. This platen roll E2 is also manufactured by the above-mentioned manufacturing method of the present invention. It can be easily manufactured by this method.

This platen roll E2 also has a multilayer structure including an inner rubber layer 2 and an outer rubber layer 4, so it is possible to reduce noise and impact during printing, and of course, it can be used for a long period of time.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects. That is, (11) A platen roll with a multilayer structure, which is difficult to manufacture using the conventional manufacturing method described above, can be manufactured extremely easily.

(2) The content of each constituent layer, that is, the number of layers constituting the multilayered platen roll, can be easily changed as necessary.

(3) Since the platen roll body can be manufactured continuously, productivity can be greatly improved compared to conventional manufacturing methods, and quality can be stabilized.

[Brief explanation of drawings]

FIGS. 1 to 8 are explanatory diagrams showing each step of the method for manufacturing a printer platen roll according to the present invention, and FIGS. 9 and 10 each show an example of a printer platen roll manufactured according to the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Core body, 2... Inner layer rubber, 3... Sound absorption reinforcement layer, 4... Outer layer rubber, 5... Mandrel, 7a, 7b
...Extruder, Ea...Unvulcanized roll body, IEb
...Vulcanized roll body, Ec...Platen roll body, EI E2...Platen roll.

Claims (1)

[Claims] An unvulcanized inner layer rubber is extruded into a tube shape around the outer circumference of a mandrel using an extruder, a sound absorbing reinforcing layer is applied to the outer circumference of this inner layer rubber, and an unvulcanized outer layer rubber is further applied to the outer circumference of this sound absorbing reinforcing layer using an extruder. After extruding and forming a continuous unvulcanized roll body, this unvulcanized roll body is vulcanized,
After that, the mandrel is pulled out from this vulcanized roll body, and this continuous vulcanized roll body is cut into a predetermined length to obtain a platen roll body, and a core is inserted inside this platen roll body. A method for manufacturing a platen roll for a printer, characterized by press-fitting the body and bonding it integrally, and then finishing the outer peripheral surface.