JPH04173365A - Roller for printer - Google Patents

Abstract

PURPOSE:To obtain a roller whose precision of axis runout is improved, making the weight lightened, eliminating expensive equipment at manufacturing, and making the manufacturing cost low, by forming at least both sides of a roller body with cavity and attaching a shaft in the cavity of the roller body by non-welding means such as press fit, caulking, and adhesion. CONSTITUTION:A shaft 2 is fitted with pressure into a cavity 1A at both sides of a pipe-like roller body 1. As occasion demands, the periphery of flanges 2A of the shaft 2 and the inner peripheral surface of the roller body 1 are adhered. Or, after the shaft 2 is fitted with pressure, the roller body 1 may be caulked by a caulker so as to fix the flanges 2A to the roller body 1. The inside diameter of the cavity 1A of the roller body 1 is made to be equal to the outside diameter of the flange 2A or a little smaller than that. Consequently, since welding machine or friction welding machine are not used, inconveniences to be caused by heat or pressure do not occur. Since the roller will be manufactured by means of press fit, caulking, and adhesion, precision of axis runout can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a platen roller, a paper feed roller, and a fixing roller used in printing devices, copying machines, and the like.

[Conventional technology]

As this type of roller 100, a roller made by cutting a round bar whose interior is not hollow is known (see FIG. 10). As shown in FIG. 11, a roller body 101 made of a hollow vibrator has a shaft shaft 102 welded to both ends of the roller body 101, as shown in FIG. Furthermore, it is also known that the shaft is frictionally welded to the vibrator.

[Problem to be solved]

Machined round bars require more manufacturing time and weight;
In order to reduce the weight in consideration of use in a portable printer, it is necessary to use a pipe in the roller body. However, expensive equipment such as a welding machine and a pressure welding machine is required. In addition, the tubular roller body was easily deformed and distorted due to heat, resulting in unstable accuracy.Furthermore, since high heat was applied to the joints, the plating at the joints could peel off and cause rust. . Furthermore, if the roller body is made longer, a pipe with a larger diameter must be used to increase rigidity, which increases the cavity volume within the roller body, and the rubber is vulcanized and bonded to the surface of the roller body. There was also a risk that the dimensions of the roller body would change due to an increase in the temperature of the sealed air inside during use.

Therefore, the purpose of this invention is to provide a roller for a printing device, etc., which uses a pipe to reduce weight while improving the accuracy of shaft runout, does not require expensive equipment during manufacturing, and is inexpensive to manufacture. do.

[Means to solve the problem]

In order to achieve the above-mentioned object, the first invention forms at least both ends of the roller body into a hollow part, and non-welding means such as press-fitting, crimping, or gluing the shaft core rod into the hollow part of the roller body. In the second invention, the inside of the roller main body is formed entirely hollow, and the shaft core rod passes through the inside of the roller main body. Furthermore, the third
In the invention, the inside of the hollow part and the outside of the roller main body are configured to have air permeability at the location where the axial winding is attached.

[Effect]

In the first invention (-), since no welding machine, friction welding machine, etc. are used, there are no inconveniences associated with heat or pressure welding, and the center runout of the shaft can be avoided by manufacturing by means such as press fitting, caulking, gluing, etc. Accuracy can be improved, inexpensive manufacturing equipment can be used, and the cost of rollers can be reduced. In the second invention, it is possible to prevent misalignment of the axis between the roller body and the shaft core. In the third invention, the air inside the roller body is not sealed, and dimensional changes in the roller body are prevented even when rubber is vulcanized and bonded or during use.

Embodiment] Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment of the first invention shown in FIG. 1, a shaft core 2 is press-fitted into a hollow portion IA on both ends of a pipe-shaped roller body 1,
If necessary, the circumferential surface of the flange portion 2A of the shaft core 2 and the inner circumferential surface of the roller body 1 are bonded together. Or the shaft core rod 2
After press-fitting, the flange portion 2A may be fixed to the roller body 1 by crimping the roller body 1 with a crimping machine. Alternatively, adhesion and caulking may be performed. The inner diameter of the hollow portion IA of the roller body 1 is formed to be the same as or slightly smaller than the outer diameter of the flange portion 2A. However, when final crimping is performed, the inner diameter of the hollow portion IA may be formed to be slightly larger than the outer diameter of the flange portion 2A. Roller body 1
For this purpose, common steel pipes such as electric resistance welded pipes, gas pipes, and seamless pipes are cut to a predetermined length. Flange 2
The shaft core rod 2 on which Δ is integrally formed is a forged product, a machined product, or the like.

Another embodiment of the first invention shown in FIG.
The shaft core rod 2 without A is inserted into the hollow part I on both ends of the roller body 1.
It shows what was press-fitted into A and glued and/or caulked as necessary.

In the embodiment of the second invention shown in FIG.
The shaft core rod 2 is shown passing through the hollow part IA, and the flange portion 2A formed integrally with the shaft core rod 2 is press-fitted into one end side of the roller body 1 and bonded and/or crimped as necessary. At the other end of the roller main body 1, the mounting member 3 is press-fitted into the hollow portion 1A, and the shaft core 2 is inserted through the roller body 1 and attached by gluing and/or crimping as necessary.

In the embodiment of the third invention shown in FIG. 4 and FIG.
A groove 4 is formed on the outer circumferential surface of the flange portion 2A and/or the mounting member 3 in the embodiment shown in the figure, and the inside of the hollow portion IA and the outside of the roller body 1 are communicated through the groove 4, and the inside of the hollow portion IA is connected to the outside of the roller body 1.
This is to prevent the air inside from being sealed. FIG. 6 shows a spiral groove 5 instead of the groove 4.

In another embodiment of the third invention shown in FIGS. 7 and 8,
Instead of the groove 4 or the spiral groove 5, the flange portion 2A or/
and a hole 6 formed in the mounting member 3 is shown.

9. In the roller of the present invention, the inner diameter of the roller body is 9.4 mm, and the outer diameter of the flange portion 2A and/or mounting member 3 press-fitted into the hollow i1A of the roller body 1 is 9.5 mm; (Prepare 4mm diameter ones and pass the shaft core rod 2 into the hollow part IA), 9
．． 5mm pieces were prepared with and without adhesive, and both were crimped. Then, as shown in FIG. 9, a suppressing load was applied from above to the center of the pipe body 1, and the amount of deformation at that time was measured. As a result, the amount of deformation was comparable to that of the roller 100 shown in FIG. 10, which was manufactured by machining a round bar.

That is, when the suppressing load is 2 kg, the round bar roller 1
For 00, the amount of deformation is approximately 23 μm, the amount of deformation is approximately 25 μm when the outer diameter is 9.5 mm, and the amount of deformation is approximately 25 μm when the outer diameter is 9.5 mm and the crimping process is performed without gluing.
The amount of deformation was 7 μm, and the amount of deformation was approximately 29 μm when the outer diameter was 9.4 mm and crimping was performed without bonding. When the suppressing load was 1 kg, the amount of deformation of all rollers was less than 8 μm. Practically, it is sufficient to assume a suppressing load of 2 kg or less, and within this range, the round bar roller 1
It has been found that there is no significant difference in the amount of deformation between 000 and the field of implementation of this invention. Further, in the present invention, the torsional torque resistance of the press-fitted portion was 100 kg-cm or more, and the pull-out force of the press-fitted portion was also 500 kg or more. Furthermore, the center runout accuracy of the shaft was 0.03 or less.

Further, in the illustrated embodiments, the entire roller body 1 is hollow IA, but it is also possible to use a roller body 1 in which only both ends are hollow.

〔effect〕

As explained above, according to the first invention, at least both ends of the roller body are formed into hollow parts, and the shaft is inserted into the hollow part of the roller body by non-welding means such as press-fitting, crimping, gluing, etc. The inconveniences associated with conventional welding and friction welding are eliminated, and expensive equipment such as welding machines and pressure welding machines is not required, and the resulting roller can be manufactured with inexpensive manufacturing equipment. can be provided to In the second invention, the entire inside of the roller body is formed hollow, and the axle passes through the inside of the roller body, so that it is possible to prevent the occurrence of misalignment of the axes between the roller body and the axle. can.

In the third aspect of the invention, the inside of the hollow portion and the outside of the roller body are configured to have air permeability at the location where the shaft is attached, so that the air inside the roller body is not sealed. As a result, when rubber is vulcanized and bonded to the surface of the roller body or during use, the sealed air may deform the roller body as the temperature or pressure increases.
In this third invention, dimensional changes in the roller body can be prevented.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view showing a first embodiment of the first invention, Fig. 2 is a sectional view showing a second embodiment of the first invention, and Fig. 3 is a sectional view showing a second embodiment of the first invention.
FIG. 4 is a sectional view showing a preferred embodiment of the third invention, FIG. 5 is a perspective view of the flange portion and mounting member used in FIG. Figure 6 is a front view showing another example of the flange part or mounting member, and Figure 7 is a front view of another example of the flange part or mounting member.
8 is a sectional view showing a second embodiment of the invention; FIG. 8 is a perspective view showing the flange portion or mounting member used in FIG. 7;
Fig. 9 is a diagram explaining an experiment of the amount of deformation against the suppression load;
FIG. 10 is a perspective view showing a conventional example, and FIG. 11 is a sectional view showing the same conventional example. DESCRIPTION OF SYMBOLS 1...Roller body, IA...Hollow part, 2...Axle shaft, 2A...Flange part, 3...Mounting member, 4...Groove, 5...Spiral groove, 6 ...hole.

Claims (1)

[Scope of Claims] 1. At least both ends of the roller body are formed into hollow parts, and the shaft center rod is attached to the hollow part of the roller body using non-welding means such as press-fitting, crimping, or gluing. Characteristic rollers of printing devices, etc. 2. The roller for a printing device or the like according to claim 1, characterized in that the inside of the roller body is entirely hollow, and the shaft axle passes through the inside of the roller body. 3. The roller for a printing device or the like according to claim 1 or 2, wherein the inside of the hollow portion and the outside of the roller main body are configured to have air permeability at a location where the shaft is attached.