JPS6092442A - Heat fixing roll for electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To obtain a high-strength roll causing no softening or warping during use at high temp. by using an Al alloy which increases its mechanical strength at the treatment temp. of an anti-offsetting layer to be attached to the core metal of the titled roll as the material of the core metal. CONSTITUTION:The core metal (support metal) of a heat fixing roll is made of an Al alloy consisting of about 4-8% Zn, about 1.0-2.0% Mg, about 0.05- 0.7% Mn, one or more among about 0.05-0.25% Zr, about 0.05-0.15% V and about 0.01-0.2% Ti and/or about 0.10-0.20% Cu and/or about 0.05-0.20% Cr, and the balance Al. The Al alloy is subjected to solid solution treatment at about 350-400 deg.C at which polytetrafluoroethylene resin is coated to cover the outside of the roll, and a hardening effect is produced only by air cooling without especially carrying out quenching in the following cooling stage. Accordingly, age hardening at ordinary temp. can be expected.

Description

[Detailed description of the invention]

Technical field The present invention relates to a heat fixing roll in a 4J electrophotographic copying machine.
il 'IJ. In conventional electrophotographic copying machines, a latent image formed on a photoreceptor is developed by applying a tonneau of thermoplastic resin powder.
Transfer the obtained toner image to paper and place the toner image on it /j
The sheet of paper is passed through a gap between a heating roll for fixing and a pressure roll, and the toner of the image is melted by applying heat and pressure, and is fixed on the sheet of paper. The fixing roll has a cylindrical shape and has a heating element inside, and its outer surface is coated with an A-fret prevention layer or an elastic layer of rubber, such as silicone rubber or Teflon (trade name: monotyrene tetrafluoride resin). There is. . (J fil) has a constant W II-ru (J fil), ■ has good heat resistance (at high temperatures, bending does not occur in the 1-ru), ■ has good thermal conductivity, ■A low coefficient of thermal expansion, ■Good machinability, and ■Good density i1/I of Teflon or silicone rubber are required. Heat fixing roll material: Nofluminium alloy △5056- H34, A 5
052-N34 (Δl-Mq system) is preferentially used. This △5000 series alloy l1 non-heat treated alloy ea-) C1 is stabilized by heating at 130 to 170°C after cold working to give it strength. However, when applying the A offset prevention layer on the roll surface,
In the case of silicon adhesion, it is left at 200°C for 10 to 20 hours, and in the case of fluororesin coating (for example, Teflon coating), it is left at 400°C for 30 minutes to 2 hours. Furthermore, under actual use conditions, it is left at 150 to 220°C for a long time. Therefore, all conventional products become soft materials in an annealed state in actual use, and their mechanical strength is significantly reduced. The heating roll receives pressure from the pressure roll.

[No. Also, due to thermal expansion, bending occurs, causing wrinkles, unfixedness, and defects in A-tile coating (1i unevenness. Especially when the structure is such that the pressure from the pressure roll is alternated even when copying is not done). This tendency is remarkable in the case of β. Conventionally, the following measures have been proposed as countermeasures against this problem. 1) Release the pressure except when copying. 2) Increase the wall thickness of the roll depending on the pressure. 3) Use materials other than aluminum. However, in 1), the structure of the device becomes complicated, and
1) leads to the stomach, 2) increases the waiting time at the start of work as the weight increases, and 3) causes malfunctions due to poor thermal conductivity. , each of which causes a different problem from the above. Purpose of the present invention: To solve the above-mentioned drawbacks of the conventional electrophotographic copying machine's heating constant r1[1-l]. a There is strong tar, ^ Softening due to use at humidity 1.
- A fuser roll made of an aluminum alloy is constructed so that the roll does not bend. (I
'=It's about being there. Structure This invention is a heat fixing roll for an electrophotographic copying machine having the following structure. (1) A hit prevention layer is provided on the surface of the supporting metal (core metal). A heating and fixing roll for an electrophotographic copying machine, characterized in that a supporting metal is formed of an aluminum alloy whose mechanical strength increases with processing dryness of an off-cera 1-prevention layer in a heating and fixing roll set up; (21 supporting metal is Zn: 4-8%, M(1:, 1.0
~2.0%, Mn: 0.05~0.7%,
Furthermore, Zr: 0.05 to 0.25%, V: 0.0
5-0.15%, 1'-i: 0.01-0.2%, and the remainder is substantially AI;
31 Supporting metal is Zn: 4-8%, Mg: 1.0-2
．． 0%, Mn: 0.05 to 0.7%, further Cu: 0.10 to 0.20%, Cr: 0.05
~0.20% of Zr: 0.05~0.2
5%, V: 0.05-0.15%, Ti: 0.05-0
．． 2% of at least one kind, and the remainder is substantially A1. Gel 71 The above (
1) The heat fixing roll of the electrophotographic copying machine described above. According to the present invention, the alloy adopted for the fixing L]-le material is a Teflon dispersion for coating the outer surface of the fixing L;
In the process, solution treatment occurs, and subsequent cooling can produce a hardening effect by air cooling, even without rapid cooling. Therefore, predynamic hardening at room temperature is l! I can hold J. This +:a+:JζS alloy according to the invention is particularly suitable for 16" anchorages requiring Teflon coating.
3.;1: The monthly strength is high, and the temperature at which the fixing roll is used, 180-230°C, corresponds to the temperature for tempering (artificial aging), so the monthly yield is strengthened during fixing. occurs, and no bending occurs in the roll. In the alloy used in the present invention C, 7-n, Mg, c
u is effective in improving the strength 1α of the alloy, and Mn, Cr,
/r, -ri have a negative effect on improving heat resistance, and
This, C11, Mo, Z'', ■ have the effect of reducing the thermal expansion coefficient, which is useful for preventing roll bending.In addition to these effects, Zr and Ti reduce the surface roughness after roll cutting. It has a thinning effect, which improves the adhesion between the roll and the coating material such as Teflon or silicone rubber.
When C'u is contained in a large amount exceeding the upper limit, hardenability is reduced. Before firing the offset prevention layer, this material has a strength close to that of annealed material, and is extremely effective when integrally molding the support metal into the pipe and journal part (plastic processing such as bulge processing and swaging). It is. With conventional material = f During molding process, △5o56-H3
4. Since it is A3057-H32, it has a certain degree of strength and is difficult to process, and on the other hand, in actual use, it is annealed and becomes a soft material, resulting in a decrease in strength. Solvable. Example As shown in the table below, one nozzle made of alloy No. 1 to No. 5 (inventive material) and two tubes made of No. 6 (conventional material AA5056) were used as shown in Fig. 1. The shape of (D
o = 40v++, l = 4001111 > fixing L1-rules were manufactured at -. This is added to fluorA resin (
Product name Denolon) was burned into the product. "When firing" - Color scheme/4
00℃ for 30 minutes, 380-39 (Teflon baking at 1℃ for 30 minutes to form a film with a thickness of 15μ. Using this sample as a sample, I0I dry pressure test was conducted at 190℃ to 11. The test results are shown in the graph in Figure 2 (Fixed [1
The curve of the roll after 120 hours is 6%. It is also shown in Table 1. Tests were also conducted on the density of Teflon. The results are also shown in Table 1. 11i *Bending suspension-1) Do, I) o, : Eye diameter 2
1]: Outer diameter of the roll after heating As is clear from the above table and FIG. 2, the roll alloy of the present invention significantly reduces the high-temperature surface roundness m of the fixing roll compared to conventional materials, and To make the deflon adhesion of O-ru as good as that of conventional materials. In addition, the strength before and after coating with fluororesin (Teflon) is shown in Table 2 below. Table 2 (Note) Creep strength is 0 at 0℃.
．． The stress that causes creep of 0.01%/1000 hours is shown. Effects (1) The fixing roll of the electronic '4' copying machine of the present invention is as follows:
Is it due to being hardened during the Tef LI baking () process? :h Strong polishing is maintained. (2) The regular roll hardly bends when used at high temperatures. The fuser roll according to the present invention can sufficiently withstand use of +11J. Fluororesin coating is an effective means for maintaining the mechanical strength of aluminum alloy members even after processing.

[Brief explanation of drawings]

Fig. 1 is a front view of the fuser roll used in the test, and Fig. 2 shows the O-
1 is a graph showing the change in the amount of runout in Le. Patent Applicant Riko Co., Ltd. - Sumitomo Light Metal Industries Co., Ltd. Agent Patent Attorney Hide Komatsu Agent Patent Attorney Hiroshi Asahi 13, Il Sankan (Voluntary) December 16, 1980 Commissioner of the Patent Office Kazu Wakasugi Husband 1, Indication of the case Special 1t (l Showa Fi8-198904 No. 3, Relationship with the case of the person making the amendment) Applicant name (G74) Ricoh Co., Ltd. (and 1 other person) 4, Agent 〒 107 (phone 58G-8854) 5,
Items of the amendment order 1 (voluntary) 6. Subject of the amendment (2) At the end of the fourth page, replace J with "Thickness". (3) In the 4th line of page 5, change the [Waiting time at the start of work] to "
"Waiting time at the start of copying" -4. 4) On page 7, line 3, ``Dispersion sintering treatment J'' has been corrected to ``coating treatment''.

Claims (1)

[Claims] (11) The A-notch prevention layer is applied to the surface of the support metal 1IiX (core metal) by heating in stages 1 and 1, and then machined with the processing temperature of Offcera 1 to Anti-11 layers in the fixing roll. Juruden F is characterized by the support metal being made of aluminum alloy, which increases the mechanical strength.
Heat fixing roll for photo duplication. (2) Support metal: 7n: 4-8%, MIJ: 1.
0 to 2.0%, Mll: 0.05 to 0.7%, and further 7r: 0.05 to 0.2! i%, V
2 0.05~0.15%, Ti:O, old/0.
At least 1 PJ in the back of 2%. A number of heat-fixing rolls for electrophotography according to claim (1), comprising an aluminum alloy including the above, with the remainder being substantially Δ1. (3) Supporting metals: Zll: 4 to 8%, Mg: 1.0
~2.0%, Mn: 0,0! Contains 0.1% of i, Qu: 0.10-0.20%, C, r:
At least 11 of 0.05-0.20%! Contains J or more, or in addition to each of the above components, further Zr:
0.05~0.25%, V: 0.05~Oj5%,
l-i: A small amount of 0.05 to 0.2% (both 1
Claims [! If (1) The heat fixing roll of the electrophotographic copying machine described in (1). 1) A heat fixing roll for an electrophotographic copying machine according to claim 1, wherein the anti-offset layer is made of a fluororesin.