JPS6070466A - Fixing device - Google Patents

Abstract

PURPOSE:To energize plural peeling members with one energizing member by extending a linear energizing member to plural peeling members. CONSTITUTION:Peeling claws 103- are installed to be freely turnable to a shaft 104, and as for the shaft 104, both its end parts are supported by a plate 105. The plate 105 is installed to be freely turnable to a top plate 106 of a fixing device 29. Plural through holes 107- are pierced at a prescribed interval on the plate 105, and the upper end part of the peeling pawls 103- is inserted into these through holes 107-. A notch part 108 is formed on the upper end part of these peeling claws 103-, and a linear spring 109 being one energizing member is extended to the notch part 108. By the linear spring 109, the peeling claws 103- are energized so as to turn clockwise, and its tip is made to contact by pressing to a heating roller 102. Also, a curved part 110 being an engaging part is formed in the center part of this linear spring 109, and this curved part 110 is engaged to an held by a holding piece 111 provided projectingly on the upper face part of the plate 105.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fixing device included in, for example, an electronic copying machine.

[Technical background of the invention and its problems]

Generally, this type of fixing device has a pair of rollers that rotate in contact with each other, and the paper on which the image has been transferred is passed between the pair of rollers, and the paper is heated and pressurized to fix the image. It looks like this.

By the way, since the paper is pressurized during this fixing, it may adhere to the roller. For this reason, a plurality of peeling claws arranged in the axial direction of the roller are pressed into contact with the roller, and the paper attached to the rainbow roller is peeled off by these peeling claws.

However, in the past, coil springs were attached to each of the plurality of peeling claws individually, and the coil springs were used to energize each of the plurality of peeling claws, which resulted in an increase in the number of parts, high costs, and poor assembly workability. The pressure contact force between the peeling claws varies, which is troublesome to manage, and the rollers are often worn, making it impossible to expect a high peeling effect.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a fixing device in which a plurality of peeling members can be made into - number of urging members and can be biased.

[Summary of the invention]

In order to achieve the above object, the present invention has a linear biasing member hooked around a plurality of peeling members, and urges the plurality of peeling members to the linear biasing member.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figures 1 to 3 show the external appearance of an electronic copying machine to which the paper feeding device of the invention is applied. The mounted paper feed cassette 3 is a paper discharge tray mounted on the left side of the main body 1 of the copying machine. Further, on the top surface of the copying machine main body 1, there is provided a document table 4 that can freely move back and forth in the left-right direction (direction of arrow a). . . . An operation Mx including input keys 9 including an exposure setting volume 7, a print key 8, etc.

' is provided.

As shown in FIG. 2, the document table 4 has a structure including a document placement plate (glass plate) 12 on which two documents 11 are placed, and a document cover 13 covering the upper surface thereof.

Further, the paper feed cassette 20 cassette cover 14 has a third
As shown in the figure, there is a manual paper feed tray 15 for manually feeding paper P as appropriate. In addition, 16 shown in Figure 2
is the power switch.

Next, the internal mechanism of the electronic copying machine will be explained with reference to FIG. In the figure, reference numeral 20 denotes a drum-shaped photoreceptor located approximately at the center of the main body 1 of the copying machine. First, a document image is uniformly charged by a charger 21 and uniformly irradiated by an exposure lamp 22, and is exposed to light by a focusing light transmitter (trade name: Self-Oak Lens Array) 23. The electrostatic latent image formed on the body 20 is converted into a toner image by the imager 24 and sent to the transfer charger 25@.

Automatically or manually fed paper P or P' is fed by the paper feeding device 26, and the toner image previously formed on the photoreceptor 20 is transferred to the transfer charger 25 onto the paper P, P or P' for color printing. Transcribe. Furthermore, the rainbow photoreceptor 20 is peeled off by a peeling charge 27 by AC corona discharge, passes through a forging path 28, and is melted and fixed on the paper p (p') by a fixing device 29, and is then transferred to a discharge roller 3θ. is discharged onto a removable tray 3.

On the other hand, the residual toner remaining on the photoconductor 20 after the toner image is transferred onto the paper p (p') is cleaned by the M'f cleaning machine 31, and the potential on the photoconductor 20 is transferred to the static eliminating machine 32. The level is lowered to below a certain level to enable the next copy operation.

Further, a fan 33 serves as a cooling device to exhaust the heat generated by the heat-generating portion of the exposure shim 22 and the fixing device 29 in the printing machine. Further, an exhaust fan 36 is also attached to the main motor 35 to cool down the heat generated by the power supply section 34 and the like.

Inside the copying machine main body 1, an upper frame and a lower frame (not shown) are pivotally supported at one end via a support shaft 37, and the other ends of both frames are configured to be opened at a desired angle, for example, 30 degrees. ing. The upper frame includes a charger 21, a focusing light transmitter 23, an exposure lamp 22, a developing device 24, a cleaning device 31, around the photoreceptor 20,
Each device such as a static elimination lamp 32 is attached by appropriate means), and a fan 33 as a cooling device, a paper feed roller 38 of a paper feed device 26, and a document table 4 are also attached to the above frame).
It constitutes the upper unit) zA. The frame also includes various mechanisms such as a paper feed cassette 2, a transfer charger 25, a peeling charger 26, a conveyance path 28, a forming guide plate 39, a fixing device 29, a pair of ejection rollers 30, a tray 3, and a motor. 35, a power supply section 34, etc. are attached to the bottom unit by appropriate means to constitute the lower unit IB. Then, after rotating and removing the front cover 1a of the main body 1 of the biger machine, almost the paper P (P
') is configured so that it can be opened and closed along the conveyance path 28. Therefore, even when the paper P ('P') is jammed on the conveyance path 28, it can be easily ejected.

In addition, 50.50 in FIG. 4 is an operation for correcting the inclination of the leading edge of the paper P automatically fed from the paper feed cassette 2 or the paper P' manually fed, and also for forming a toner image on the photoreceptor 2o. A pair of registration rollers 50 and 50 supply the paper P or P' toward the transfer charger 25 in synchronization with the timing. 51 is a manual feed detection switch disposed immediately before the pair of registration rollers 50 and 50.

52 is a paper discharge switch, 53 is a total counter, 54 is a vapor empty switch that detects when the paper P in the paper feed cassette 2 is empty, and 55 is a developing device 24.
56 is a toner hopper, 57 is a toner out detection switch, 58 is a toner concentration detector that prevents the document table 4 from moving. 6o is a high voltage transformer, 61 62 is a handle formed for opening and closing the upper unit A, 63 is a reflector surrounding the back of the exposure lamp 22, and 64 is an auxiliary reflector.

Further, 65 is a main body for bringing the cleaning blade 66 of the cleaning device into contact with the photoreceptor 2o at a constant pressure, and causes a solenoid (not shown) to move the rainbow blade toward and away from the photoreceptor 2o.

Note that the reflector 63, the auxiliary reflector 64, and the convergent light transmission body 23 are assembled as one unit.

Further, the paper feed device 26 provided at the lower right side of the copying machine main body 1 has a paper feed cassette 2, and the upper surface side of the paper feed cassette 2 is connected to a paper ejection opening provided with separation claws 7 (7, 70). It has a configuration including a manual paper feed tray 5 formed on a cassette cover 72 that covers all but 71 of the sheets, and a paper feed roller 8 for taking out and feeding paper P from the paper feed cassette 2.

Next, the fixing device 29 will be described in detail.

As shown in FIG. 5, this fixing device 29 includes a pressure roller 01, a fixing body pressed against the pressure roller 01, and a buttock heating roller 02. A plurality of peeling claws 103 serving as peeling members are disposed at predetermined intervals along the axial direction on the paper discharge side of the heat rollers 101 and 102. The peeling claws 103 are rotatably attached to a shaft 104, and the shaft 104 is supported at both ends by a plate 105.
5 is rotatably attached to the top plate 106 of the fixing device 29. A plurality of through holes 107 are formed in the plate 105 at predetermined intervals, and these through holes 102 are formed at predetermined intervals.
The upper ends of the peeling claws 103 are inserted inside. Notches 108 are formed at the upper ends of these peeling claws 103, respectively, and a linear spring 109 as a biasing member is hooked across these notches 10B.

The linear springs 109 and peeling claws 103 are urged to rotate clockwise, and their tips are brought into pressure contact with the heating row 2102.

Further, a curved portion 110 as an engaging portion is formed in the center of the linear spring 109, and this curved portion 110 is secured and held by a holding piece 111 protruding from the upper surface of the plate 1o5. .

Therefore, the paper onto which the image has been transferred is
J:! is introduced between the heating roller 162 and passes through. ll The image is heated and pressurized to fix it, but during this fixing (''--the paper adhering to the heating roller 102 is peeled off by the peeling claw 103, and is ejected via the paper ejection roller 3o. It will be papered.

As described above, since the plurality of peeling claws 103 are biased by one linear spring 109, the number of biasing members can be reduced and assembly workability is excellent.

Furthermore, the pressing force of the peeling claws 103 against the heating roller 1θ1 can be made uniform, and the peeling effect is stabilized.
Since the linear spring 109 is held by the holding piece 111 of the plate 105, the mounting position is fixed and it is difficult to come off, so there is no risk of it falling off even if it is handled roughly.

Next, the mounting structure of the paper discharge row 230 will be described in detail. The paper discharge roller 30 is held by a holder 113 made of synthetic resin shown in FIG. 6, and the holder 113 has a handle portion 114 integrally molded at its center and locking claws 115 at both sides. This holder 113 has its handle portion 11
4 is inserted into the through hole 116 drilled in the plate 104 and positioned, and the locking claws 115 and 115 are locked in the locking holes 117 and 117 drilled in the plate 104. 0 However, if paper or the like becomes jammed in the paper ejection row 230, as shown in FIG.
Lifting up 14 in hand (= Niji plate 10
4 is rotated as shown by the two-dot chain line, the paper discharge row 230 is released, and the paper can be removed.

As mentioned above, since the handle part 114 is integrally molded on the holder 113, the size can be reduced, and the handle part 114 can be made smaller.
Since the handle part 114 is molded from resin, the handle part 114 can be held by hand even if the mounting part becomes hot. Furthermore, holder 11
3 can be positioned using the handle part 114, and no stress is applied to the locking claws 115.
It can prevent the departure of...

〔Effect of the invention〕

As explained above, in the present invention, a linear biasing member is passed around a plurality of peeling members, and the linear biasing member biases each of the plurality of peeling members. Compared to the case where coil springs are attached to each of multiple peeling claws, the number of biasing members can be reduced, the structure can be simplified and the cost can be reduced, and the pressing force of the peeling member against the fixing body can be made uniform, resulting in a better peeling effect. Excellent.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS.
Figure 4 is a perspective view of the electronic copying machine, Figure 4 is its internal configuration, Figure 5 is a perspective view of the fixing device, Figure 6 is a perspective view of the mounting structure of the paper ejection roller, and Figure 7 is the fixing device. FIG. 8 is a side view showing the paper discharge device, FIG. 8 is a plan view thereof, and FIG. 9 is a front view thereof. 102... Fixing body (heating roller), P... Fixing object (paper), 103... Peeling member (peeling claw), 109.
...Biasing member - (linear spring). Applicant's agent Patent attorney Nihiko Suzue Figure 5 Figure 6 Procedural amendment document Showa Rei 9. q, 29E3 Manabu Shiga, Commissioner of the Patent Office, Patent Application No. 58-179575 2, Invention Name Fixing Device 3, Relationship with the Amendment Person Case Patent Applicant (307) Toshiba Corporation 4, Agent 5, Voluntary action Correction 7, Contents of correction +11 "(Product name Selfoc Lens Array)" written on page 4, line 18 of the specification is corrected to "(Product name Selfoc Lens Array)". (2) "Above" written on page 6, line 14 of the specification is corrected to "lower part." C3) Replace “26” written on page 6, line 16 of the specification with “2”
7,” he corrected.

Claims (2)

[Claims] (1) In an apparatus in which a to-be-fixed object that is in contact with a fixing body is peeled off using a plurality of peeling members, a hook is passed through the plurality of peeling members, and the plurality of peeling members are urged to come into pressure contact with the fixing body. A fixing device characterized by comprising a linear biasing member that causes the fixing device to move. (2) The fixing device according to claim 1, wherein the biasing member has a retaining portion in a part thereof, and the retaining portion is retained by the holding piece.