CN209514312U - Fixing device and image forming apparatus - Google Patents

Abstract

The utility model provides a kind of fixing device and image forming apparatus, the fixing device includes columnar fixing belt, with the fever accessory plate being mounted in the fixing belt, the fever accessory plate is mounted on a fixed frame, being provided on the fixed frame can the adjustable shelf that moves back and forth of the relatively described fixed frame, it is equipped on the fixed frame by the adjustable shelf to the thrust spring pushed far from the fixed frame direction, is coaxially installed with secondary spring in the thrust spring.The utility model is using the thrust spring and secondary spring being set with, the thrust to fixed frame and adjustable shelf can be increased, and then increase the pressure that fever accessory plate is born, and its it is applied to the pressure on fixing belt, make the more stable closer inner surface for being attached to fixing belt of accessory plate that generates heat, to prevent the vibration of fever accessory plate, while it can inhibit noise caused by its viscoplasticity when being detached from silicone grease.

Description

Fixing device and image forming apparatus

Technical field

The utility model relates to one kind can eliminate the fixing device that fever accessory plate shakes at work, and fixed using this The image forming apparatus of image device.

Background technique

Existing office space generally uses an image forming apparatus (MFP:Multi-Functional Peripheral) be used as public office equipment, the course of work of image forming apparatus is as follows: original copy feedway for putting or Original copy is conveyed, scanning element obtains the optical analog picture signal of original copy by exposing, and is sent to transfer device, transfer dress Setting makes optical analog picture signal form electrostatic latent image in the photosensitive drum surface of image forming unit, and image forming unit will be adjusted again Toner, which is adsorbed onto photosensitive drums, makes electrostatic latent image become toner image, then using transfer belt by toner image be transferred to by On the paper of sheet feeding-device conveying, the row of being discharged to after being finally fixed by fixing device to the toner image on paper Paper portion.

Fixing device is to be fixed by heating method to the toner image on paper.Wherein, pass through electromagnetism sense The fixing device for answering heating method to work generally comprises the fixing belt of tubular, is mounted on the hair being made of in fixing belt magnetic material Hot accessory plate, applying elastic force to fever accessory plate makes it be adjacent to the thrust spring of fixing belt inner surface, fever accessory plate and fixing The inner surface of band is sliding contact, for raising sliding effect, is coated with the lubricants such as silicone grease in the inner surface of fixing belt.

Under the above constitution, in the installation process in accessory plate insertion fixing belt that will generate heat, need to overcome thrust spring Elastic force make to generate heat accessory plate (i.e. the direction opposite with the diameter of fixing belt) in the direction of the width size it is the smaller the better, therefore, The smaller then easier width dimensions for reducing fever accessory plate of the elastic force of the thrust spring of use, but the elastic force of thrust spring becomes After weak, the pressure that fever accessory plate abuts fixing belt inner surface can also die down, in friction and the silicon of fever accessory plate and fixing belt Under the factors such as the adsorption capacity of rouge, fixing belt can generate vibration and noise in rotary course.

Utility model content

The purpose of the utility model is to provide one kind can eliminate the fixing device that fever accessory plate shakes at work, and Using the image forming apparatus of the fixing device.

Specifically, the utility model provides a kind of fixing device, including columnar fixing belt, and is mounted on the fixing Fever accessory plate in band, the fever accessory plate are mounted on a fixed frame, and being provided on the fixed frame can be opposite The adjustable shelf that the fixed frame moves back and forth is equipped with the adjustable shelf to far from the fixed frame side on the fixed frame To the thrust spring of promotion, secondary spring is coaxially installed in the thrust spring.

In the another embodiment of the utility model, a kind of image forming apparatus is provided, comprising: original copy supply dress It sets, conveys original copy to be transferred；Scanning element is obtained by scanning the optical analog picture signal of original copy；Image forming unit, For the optical analog picture signal to be converted into toner image；The toner image is transferred to paper by transfer device Zhang Shang；Fixing device will be expelled to discharge tray after the toner image being formed on the paper；The fixing Device includes columnar fixing belt, and the fever accessory plate being mounted in the fixing belt, and the fever accessory plate is mounted on On one fixed frame, be provided on the fixed frame can the adjustable shelf that moves back and forth of the relatively described fixed frame, in the fixation It is equipped on frame by the adjustable shelf to the thrust spring pushed far from the fixed frame direction, it is coaxial in the thrust spring Secondary spring is installed.

The utility model can be increased and be pushed away to fixed frame and adjustable shelf using the thrust spring and secondary spring of suit Power, and then increase the pressure that fever accessory plate is born, and its pressure being applied on fixing belt, keep fever accessory plate more stable more It closely is attached to the inner surface of fixing belt, to prevent the vibration of fever accessory plate, while it is viscous to can inhibit when being detached from silicone grease it Noise caused by elasticity.

Detailed description of the invention

Fig. 1 is the image forming apparatus structural schematic diagram of one embodiment of the utility model；

Fig. 2 is the structural schematic diagram of fixing device in the prior art；

Fig. 3 is the structural schematic diagram in one embodiment of the utility model inside fixing belt；

Fig. 4 is that secondary spring is mounted on the top view inside thrust spring in Fig. 3.

Specific embodiment

Hereinafter, the image forming apparatus that embodiment is related to is described in detail with reference made to the accompanying drawings.In addition, same place in each figure It is marked with same symbol." top " and " lower section " refers to when image forming apparatus as shown in Figure 1 is normally placed in ground Upper and lower direction.And the left and right side of " left side ", " right side " when being towards each figure.

Fig. 1 is the image forming apparatus structural schematic diagram of one embodiment of the utility model.

In Fig. 1, image forming apparatus 100 can be the MFP (Multi-Function as compounding machine Peripherals), the equipment such as printer or duplicator.It is illustrated by taking MFP as an example in the following description.

MFP100 includes one for installing the ontology 11 of each component, and the top of ontology 11 is provided with conveying original to be transferred The original copy feedway 12 of original text, and the operation panel 13 of various function control keys in image transfer process, operation panel are provided 13 include the display unit 15 of the operation portion 14 and touch plate type that are made of various keys.

The lower part of original copy feedway 12 is provided with scanning and reads the scanning element 16 of original copy dual-side image information, sweeps It retouches unit 16 and reflexes to photoelectric conversion by way of the image information on original copy that light source irradiate is passed through light beam by reflection microscope group Optical analog picture signal is formed on element CCD.

It is also equipped with transfer device 17 in ontology 11 and accommodates the paper that multiple paper feeding cassettes 18 of various sizes medium are constituted Open feedway.

Image forming unit 17 includes providing the toning of yellow (Y), magenta (M), cyan (C), black (K) various colors Agent box 28 (28Y, 28M, 28C, 28K), and the sense according to the optical analog picture signal of scanning element 16 generation toner image Light portion 20 (20Y, 20M, 20C, 20K), and by the transfer belt of the image primary transfer on photographic department 20Y, 20M, 20C, 20K 21.The cleaner of remaining toner on cleaning photographic department is installed at image forming unit 20Y, 20M, 20C, 20K.

Transfer belt 21 is erected on driven roller 32 and driven voller 33,34, and driven roller 32 is opposite with secondary transfer roller 35 to match It sets.When medium S (paper) is passed through between driven roller 32 and secondary transfer roller 35, secondary transfer roller 35, which will apply transfer voltage, to be transferred It is transferred on medium S (paper) with the toner image on 21.Cleaning transfer is provided near the driven voller 34 of transfer belt 21 Cleaner 36 with toner on 21.

In sheet feeding-device between secondary transfer roller 35, point equipped with the medium S (paper) taken out in paper feeding cassette 18 From roller 37, and the paper of taking-up is conveyed to and prevented the conveying guiding element 19 of paper jam, is arranged in the downstream of secondary transfer roller 35 There is the fixing device 39 to toner image on medium S (paper).It is provided in the downstream of fixing device 39 by medium S The transfer roller 40 that (paper) is discharged to discharge tray 41.

Further, two-sided transmitting path 42 can also be set in the downstream of fixing device 39.Two-sided transmitting path 42 makes to be situated between It is guided after matter S (paper) reversion to 35 direction of secondary transfer roller, to carry out duplex transfer printing to medium S (paper).

In an embodiment of the utility model, as shown in Fig. 2, disclosing a kind of fixing device 39, the fixing device 39 include the fixing belt 390 of cylinder-shaped both ends open, and the fever accessory plate in fixing belt 390 is mounted on by inserting mode 394, electromagnetic induction heating coil is provided at side outside fixing belt 390 and position corresponding with fever accessory plate 394 393, the other side outside fixing belt 390 is provided with and fixing belt 390 with 393 corresponding position of electromagnetic induction heating coil The pressure roller 392 of abutting.

When fixing, magnetic flux is generated between electromagnetic induction heating coil 393 and fever accessory plate 394, and then make fixing belt 390 Heating, when the paper for being printed on toner image to be fixed is transmitted by the roll gap between pressure roller 392 and fixing belt 390 When, toner image is fixed on paper by the fixing belt 390 after heating by high temperature during rotation, completes fixing.

As shown in Figure 3,4, the fever accessory plate 394 inside fixing belt 390 is mounted on a fixed frame 398, The adjustable shelf 399 that can be moved in the diametrical direction of fixing belt 390 is provided on fixed frame 398, meanwhile, on fixed frame 398 It is equipped with adjustable shelf 399 to the thrust spring 395 pushed far from 398 direction of fixed frame, is co-axially mounted in thrust spring 395 There is secondary spring 396.

The relatively fixed frame 398 of the adjustable shelf 399 being mounted in fixing belt 390 can move freely, under normal condition, by thrust Spring 395 and secondary spring 396 are pushed to the direction far from fixed frame 398, and are connected to the inner surface of fixing belt 390, simultaneously The also inner surface under the reaction force of his secondary spring 396 of thrust spring 395 with 390 opposite side of fixing belt of fixed frame 398 It is adjacent to.

Using the thrust spring 395 and secondary spring 396 of suit, pushing away to fixed frame 398 and adjustable shelf 399 can be increased Power, and then increase the pressure that fever accessory plate 394 is born, and its pressure being applied on fixing belt 390, make the accessory plate that generates heat 394 it is more stable it is closer be attached to the inner surface of fixing belt 390, to prevent the vibration of fever accessory plate 394, while can press down Noise caused by its viscoplasticity when system fever accessory plate 394 is detached from silicone grease.

When the accessory plate 394 that will generate heat is inserted into fixing belt 390, fixed frame 398 and adjustable shelf 399 can be clutched, by two Thrust spring 395 and secondary spring 396 between person compress, and the overall width of fixed frame 398 and adjustable shelf 399 is made to be less than fixing belt 390 internal diameter is inserted into fixing belt 390, unclamps again the control to fixed frame 398 and adjustable shelf 399, can make to generate heat auxiliary Plate 394 is helped to push against the inner surface of fixing belt 390 under the action of thrust spring 395 and secondary spring 396.

Secondary spring 396 after installation is identical as the height of thrust spring 395 in vertical direction, to apply to outside Synchronous elastic force.

Secondary spring 396 is inserted into the inside of thrust spring 395, and secondary spring 396 is not contacted with thrust spring 395, It influences each other to avoid in compressive deformation.

In the pressure limit that fixing belt 390 is able to bear, the elastic force that can be thrust spring 395 is greater than secondary spring The structure of 396 elastic force, secondary spring 396 helps out to thrust spring 395 at this time, due to elastic force difference, auxiliary The vibration frequency of spring 396 and thrust spring 395 is different, so as to neutralize and reduce the oscillation phenomenon of fever accessory plate 394.

Likewise, the elastic force for being also possible to secondary spring 396 is greater than the elastic force of thrust spring 395, effect and thrust spring Effect when 395 elastic force is greater than the elastic force of secondary spring 396 is consistent.

In present embodiment, the longitudinal cross-section of fever accessory plate 394 is arc, i.e. generally arc plate shape, by outer Cambered surface is contacted with the inner surface of fixing belt 390, which can increase the heating surface (area) (HS with fixing belt 390.

The structure of fixed frame 398 itself is corresponding with the length of fixing belt 390 in length, but is less than fixing belt on the width 390 diameter, to reserve enough mobile spaces, the one side that fixed frame 398 is contacted with fever accessory plate 394 for adjustable shelf 399 It can be arcuate structure, the arc-shaped inner surface of arcuate structure and fever accessory plate 394 is fixed, and fever accessory plate 394 can be improved Support strength, can the stable inner surface with fixing belt 390 be bonded.

In an embodiment of the utility model, one end and fixed frame of thrust spring 395 and secondary spring 396 398 connections, the other end are connect with the sliding seat 391 of a bar shaped, and sliding seat 391 connect with adjustable shelf 399 and slidably installs On adjustable shelf 398, the glide direction of sliding seat 391 is identical as the elastic force direction of thrust spring 395 and secondary spring.

Sliding seat 391 and the sliding connection structure of fixing seat 398 can be the strip groove being arranged on fixed frame 398 The length direction of (not shown), strip groove is identical as the elastic force direction of thrust spring 395 and secondary spring 396, sliding seat 391 can be directly clamped among in strip groove, and slide in strip groove under the elastic force of thrust spring 395 and secondary spring 396, thus Push the adjustable shelf 399 of connection close to fixed frame 398 or far from fixed frame 398.Sliding connection structure in other embodiments It is also possible to the structures such as guide rail, ball screw, as long as move freely sliding seat 391 can in the horizontal direction.

Although the description of the several embodiments of the utility model, but these embodiments are intended only as example and propose , it is not intended to limit the scope of the utility model.These new embodiments can be implemented with various other ways, In the range of not departing from the main idea of utility model, it is able to carry out various omissions, displacement, combination and change.These embodiments It is all contained in the scope of the utility model and main idea, and is contained in originally practical new documented by claims with its deformation In type and its equivalency range.

Claims (10)

1. a kind of fixing device, including columnar fixing belt, and the fever accessory plate being mounted in the fixing belt, the hair Hot accessory plate is mounted on a fixed frame, and being provided on the fixed frame can the activity that moves back and forth of the relatively described fixed frame Frame is equipped with the adjustable shelf to the thrust spring far from fixed frame direction promotion, feature on the fixed frame It is, is coaxially installed with secondary spring in the thrust spring.

2. fixing device according to claim 1, which is characterized in that

The secondary spring and the thrust spring are contour.

3. fixing device according to claim 1, which is characterized in that

The secondary spring is not contacted with the thrust spring.

4. fixing device according to claim 1, which is characterized in that

The elastic force of the secondary spring is less than the elastic force of the thrust spring.

5. fixing device according to claim 1, which is characterized in that

The elastic force of the secondary spring is greater than the elastic force of the thrust spring.

6. a kind of image forming apparatus, including

Original copy feedway conveys original copy to be transferred；

Scanning element is obtained by scanning the optical analog picture signal of original copy；

Image forming unit, for the optical analog picture signal to be converted into toner image；

The toner image is transferred on paper by transfer device；

Fixing device will be expelled to discharge tray after the toner image being formed on the paper；

It is characterized in that, the fixing device includes columnar fixing belt, and the fever auxiliary being mounted in the fixing belt Plate, the fever accessory plate are mounted on a fixed frame, be provided on the fixed frame can the relatively described fixed frame back and forth Mobile adjustable shelf is equipped with the adjustable shelf to the thrust bullet far from fixed frame direction promotion on the fixed frame Spring is coaxially installed with secondary spring in the thrust spring.

7. image forming apparatus according to claim 6, which is characterized in that

The secondary spring and the thrust spring are contour.

8. image forming apparatus according to claim 6, which is characterized in that

The secondary spring is not contacted with the thrust spring.

9. image forming apparatus according to claim 6, which is characterized in that

The elastic force of the secondary spring is less than the elastic force of the thrust spring.

10. image forming apparatus according to claim 6, which is characterized in that

The elastic force of the secondary spring is greater than the elastic force of the thrust spring.