JPS6144665A - Platen for business machine such as printer or the like - Google Patents

Abstract

PURPOSE:To obtain the titled platen having the excellent properties of a durability, light weight, mass production machinability and the like by providing the thick hollow pipe having the bearing sections made of the hollow pipe formed integral with the both ends thereof and provided with stems. CONSTITUTION:The bearing sections 12, 13 of the thin hollow pipe are formed by applying the plastic working such as drawing work or swaging work, or the like, or the plastic working combined of these methods to the both sides of the thick hollow pipe body 11. The strength of the connection sections between the bearing sections 12, 13 and the stems 14 is made large, and a working process is simplified, the weight of a production is made into light by a press in of the stems from both ends of the bearing sections or by a securing of the adhesive agent.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to printers, facsimiles, quib writers, word processors, telex machines, and copying machines.

This invention relates to platens for office equipment used in other electronic office equipment.

(Prior Art) The above-mentioned office equipment is rapidly becoming popular with office automation, and the platen used in these equipment is important as a member that performs paper feeding and printing functions.

By the way, as shown in FIG. 8, a conventional platen has a main body 3 formed by overlapping an inner cylinder 1 and an outer cylinder 2 by extrusion molding, and a shaft 4 is press-fitted from both ends of the inner cylinder 1. It is being

However, the above-mentioned platen becomes unusable in a short period of time because the position of the press-fit end between the inner cylinder 1 and the shaft 4 becomes eccentric or distorted during use due to impacts during transportation, etc., and is easily damaged. There is a model in which a metal shaft 5 is press-fitted into a square-shaped inner cylinder 1. However, although this example is more durable than the one shown in Figure 8, it is still unsuitable for office equipment as it is heavier, is not suitable for electronic equipment, and increases cost. It has some problems.

Looking at other examples, all of them had deficiencies in terms of durability, light weight, cost, etc., and it was hoped that a product that would solve these problems would emerge.

(Problem that the invention seeks to solve).

The present invention was developed to solve the above-mentioned conventional problems, and has excellent durability, lightness, mass production processability, etc., which are essential conditions for platens for office equipment, and also aims to reduce costs. The aim is to provide what is possible.

(Means for Solving the Problems) The present invention applies plastic working to the end portion of a hollow pipe to form a bearing portion having a reduced diameter, and also provides a bearing portion integrally with the bearing portion on each of both sides. Or it has a separate shaft.

(Function) It can be easily mass-produced by plastically processing the end of the hollow pipe, and there is no risk of damage due to long-term use or impact, and since the main body is hollow, it is lightweight as well. This allows it to effectively function as a platen.

(Embodiment) Below, embodiments of the present invention will be described according to the drawings.
The figure is a longitudinal cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1. In the figure, 11 is aluminum;
A hollow pipe made of stainless steel, steel pipe, seamless steel pipe, or synthetic resin, and the end of this hollow pipe 11 is
The bearing parts 12 and 13 are formed by reducing the diameter by performing plastic working such as drawing or swaging, or plastic working that combines these working methods, and this bearing part 12
- 13 is provided in a concentric position with the hollow pipe 11.

In addition, by providing one or both of the bearing parts 12 and 13 at an eccentric position of the hollow pipe 11, it becomes convenient to adjust the paper, for example.

Reference numeral 14 is a shaft rod made of metal such as stainless steel, and this shaft rod 14
・Press-fit the screws 14 into the bearing parts 12 and 13 and fix them. Further, the shaft rod 14 has a length and shape so as to be incorporated into a corresponding position of office equipment.

15 is a rubber coating layer or a synthetic resin coating layer coated on the outer periphery of the hollow pipe 11.

Next, the operation of the above embodiment will be explained.

The end portion of the hollow pipe 11 is subjected to plastic processing such as swaging to reduce the diameter of the bearing portions 12 and 13, and the shaft rods 14 are press-fitted from both ends of the bearing portion or bonded and fixed with adhesive. The strength of the joint between 12 and 13 and the shaft rod 14 is increased, the processing process is simplified, and the entire product is lightweight.

3 to 7 are partially cutaway sectional views illustrating other embodiments of the present invention, and since the same reference numerals as in the first embodiment indicate the same parts, the explanation will be omitted.

In FIG. 3, the bearing portion 12a and the shaft rod 14a are integrally molded by plastic working such as swaging, and the reduced diameter portion of the hollow pipe 11 and the bearing portion 12a forms a tapered portion 16.

In the case of this example, it is possible not only to reduce the weight but also to significantly simplify the processing process, which is excellent in mass production processability, and allows cost reduction.

In FIG. 4, a hollow pipe 11 is reduced in diameter by plastic working to form bearing parts 12, a tapered part 16 is formed in the reduced diameter part, and a shaft rod 14 is bonded and fixed to the bearing part 12. be.

In FIG. 5, the bearing portion 12b and the shaft rod 14b are integrally molded by plastic working, and the reduced diameter portion of the hollow pipe 11 and the bearing portion 12b forms a stepped portion 17. In the case of this example as well, it is possible to achieve lightness, ease of mass production, and reduction in cost.

Figure 6 shows the hollow pipe 11 and bearing part 12C formed by plastic working.
A tapered portion 16c is formed in the reduced diameter portion of the bearing portion 12C.
A shaft rod 14 is bonded and fixed to the shaft. In this example,
In particular, since the tapered portion 16C is inclined toward the inside of the hollow pipe 11, the joint strength of the shaft rod 14 is good.

In FIG. 7, the bearing portion 12d and the shaft rod 14d are integrally reduced in diameter by plastic working, and the reduced diameter portion forms a tapered portion 16d.

In the case of this example as well, it is possible to achieve lightness, ease of mass production, and durability, and to reduce costs.

In addition, contrary to the above embodiments, plastic working may be performed while expanding the diameter of the pipe, and in this case as well, the same effects as above are achieved.

(Effects of the Invention) From the above, the present invention has the following excellent effects.

(1) Since the bearing part or the bearing part and the shaft rod are integrally molded by plastic working of the hollow pipe, and the inside of the hollow pipe is made hollow, we have succeeded in significantly reducing the weight compared to conventional products.

(2) Since the shaft rod is provided integrally or separately in the bearing part, there is no risk that the shaft rod will be subjected to external impact or be damaged even after long-term use, and is extremely durable.

(3) Since it can be easily and reliably formed by plastic working, mass production workability is better than in the past, and cost reduction can be achieved.

[Brief explanation of the drawing]

1 to 7 show each embodiment of the present invention,
FIG. 1 is a partially cutaway longitudinal cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A of the same, and FIG. 4 to 7 are partial sectional views showing other embodiments, and FIG. 8 or 9 shows a conventional platen for office equipment. FIG. 11...Hollow pipe 12.12a, 12b. 12c, 12d, 13...bearing part 14.14a, 1
4b, 14d--Axle rod 15...Rubber, synthetic resin coating layer 16.16c, 16d,...Tapered part
17...Stepped part Figure 1 Figure 2 Figure 8 Figure 9 Procedure Nefu official document (spontaneous) September 7, 1980

Claims (11)

[Claims] (1) The end of the hollow pipe is plastically worked to form a bearing part with a reduced diameter, and a shaft rod is provided on each bearing part on both sides, either integrally with the bearing part or separately. Features: Platens for office equipment such as printers. (2) The platen for office equipment such as a printer according to claim 1, wherein the bearing portion is formed at a position concentric with the hollow pipe. (3) The platen for office equipment such as a printer according to claim 1, wherein one or both of the bearing parts is formed at an eccentric position of the hollow pipe by reducing the diameter by plastic working. (4) A platen for office equipment such as a printer as set forth in claims 1 to 3, in which shaft rods are bonded and fixed to the bearing portions on both sides, respectively. (5) A platen for office equipment such as a printer as set forth in claims 1 to 4, in which a shaft rod is press-fitted into each bearing portion on both sides. (6) Office equipment such as a printer as set forth in Claims 1 to 4, wherein a shaft rod is inserted into each bearing portion on both sides, and the shaft rod and the bearing portion are fixed with an adhesive. platen. (7) A platen for office equipment such as a printer as set forth in claims 1 to 3, wherein the shaft rod is extended by plastic working integrally with the bearing portions on both sides. (8) A platen for office equipment such as a printer according to any one of claims 1 to 7, wherein the diameter-reduced portion of the hollow pipe and the bearing portion has a stepped shape. (9) A platen for office equipment such as a printer as set forth in any one of claims 1 to 7, wherein the diameter-reduced portion of the hollow pipe and the bearing portion has a tapered shape. (10) A platen for office equipment such as a printer according to any one of claims 1 to 9, wherein a rubber coating layer is provided on the outer periphery of the hollow pipe. (11) A platen for office equipment such as a printer as set forth in claims 1 to 9, wherein a synthetic resin coating layer is provided on the outer periphery of the hollow pipe.