JPS5883877A - Pressure-fixing device for electronic copying machine - Google Patents

Abstract

PURPOSE:To prevent creases of a paper caused by the deformation of a rubber layer, by setting contact areas of press plates, which press both end faces of the rubber layer, to 40-60% of the overall area of end faces of the rubber layer. CONSTITUTION:A cylindrical rubber layer 6 is provided around a core bar 5 of a pressure roll 1. Press plates 2 press-fixed to end faces of the rubber layer 6 are detained on both ends of the core bar 5 by detaining rings 3, and a contact area S between press plates 2 and the rubber layer 6 is set to 40-60% of the overall area of end faces of the rubber layer 6. Thus, the rubber layer 6 is not deformed in both ends even for fixing of many copy papers, and the durability of the pressure roll 1 is improved furthermore, and creases of a paper caused by the deformation of end parts of the rubber layer 6 are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure fixing device for an electronic copying machine, which is a modified version of the pressure roller, in order to prevent wrinkles from forming on paper during electrodeposition. Fixing device No. 11i!
As shown in FIG.
1. The paper that should be fixed in this fixing field 4 (wi is not shown)
The pressure seal 1 that presses the
is jliil! of the core metal 5 as shown in FIG. rubber layer 6
It has a cylindrical structure with a rubber layer 6 at both ends of one core metal 5.
A holding plate 2 with INK crimped at both ends thereof is locked by a locking ring 3. However, in the pressure field 1 having the above structure, the contact area S1 of the presser plate 2 that presses the end surface of the rubber layer 6 is small, so when the number of copies reaches 500,000 to 600,000, both ends of the rubber layer 6 This deformation occurs as shown in FIG. 2B, causing wrinkles in the paper during fixing.

This invention was made for the purpose of rectifying this problem, and the contact area S of the presser plate 2 that presses both end surfaces of the rubber layer 6 is
To provide a pressure fixing device for an electronic copying machine in which m is in the range of 40 to 60 - of the entire end surface of the rubber layer 6, and to prevent paper wrinkles caused by deformation of the rubber layer 6. 0 or less This invention "liEg" will be described in detail with reference to an embodiment whose main body is shown in FIG. 3. In the figure, 1 is a pressure reel similar to the conventional one, A cylindrical rubber layer 6 is provided on both ends of the core metal 5.
The presser plate 2 crimped to the end m is locked by the locking ring 3, and the presser plate 2 contacts the rubber layer 6
ifllj- is com layer 6111Ii6 all 1fllf14
It is set roughly between 0 and 60%. In addition, presser plate 2
By setting the contact area S- of 40 to 60%, the contact surface II
I did a colonization test by changing IIS to a variety of species, and some of the results were 41.
1 shows 11 touches [111m15#40~601G
)lill"t'F!.

This is because even when the number of fixed sheets reached 100,000 sheets, there was no deformation that would cause wrinkles at both ends of the rubber layer 6, and if it was less than 40% or 601 or more, the rubber that would cause wrinkles would exceed 500,000 sheets. Deformation began to occur at both ends of layer 6.

As described in detail above, this invention has the core metal 5 of the pressure reel 1.
Presser plates 2 provided at both ends to press both end surfaces of the rubber layer 6
Since the contact area Sl is set to 40 to 60 times over the entire end surface of the rubber layer 6, both ends K of the rubber layer 6 can be fixed even when a large number of sheets are fixed.
l! ! In order to prevent paper from forming and thereby to prevent the paper from wrinkling due to the deformation of the ends of the five layers of anti-corrosion 6 of the pressure rail 1, the contact of the presser plate 2 is also prevented. Just by increasing Hva s@, it is easy and inexpensive KwI! It also heals by giving.

[Brief explanation of drawings]

Figure 111 is a front view of a conventional pressure fixing device. lI
is an enlarged sectional view within the 81111 circle, and Figure 3 is the - of Jin's invention.
vI & FIG. 4 is a partial sectional view of the pressure rail as an example, and is an S diagram showing the experimental results. I is a pressure roller, 2#'1 presser plate, 4 is a fixing roll, 5
The core metal %6 is Go, 5 layers. Applicant: Fuji Zeda Tsukusu Co., Ltd. Representative Patent Attorney: Masaaki Yonehara Patent Attorney: Tadashi Hamamoto

Claims (1)

[Claims] In a device that fixes the toner image on the paper under pressure by pressing the paper with the pressure seal 1 against the fixing roll 4 which has a printer installed therein, the pressure roll 1 is connected to the core bar 5. A rubber layer 6 formed around the circumference of the core bar 5 and a presser plate 2 provided on both ends of the core bar 5 and press-bonded to the end surface of the rubber layer 6 are also constructed. Contact surface W of plate 2
aS, as IIB of 40 to 60 strokes of the entire end surface of the rubber layer 6, the pressure fixing device of the electronic copying machine @