CN209514313U - 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 elastic component far from fixed frame direction promotion, it is characterized in that, rotatable shaft is installed on the fixed frame, the eccentric wheel contacted with the elastic component is fixed on the shaft.The utility model can reduce the elastic force that fever accessory plate and adjustable shelf are subject to, be easily inserted into fever accessory plate in fixing belt by adjusting the state of eccentric wheel when the accessory plate that generates heat is inserted to fixing belt；And after inserting in place, and the normal elastic force that fever accessory plate and adjustable shelf are born can be restored, the receiving pressure of fixing belt is improved in the case where not influencing assemblability.

Description

Fixing device and image forming apparatus

Technical field

The fixing device of noise when can reduce work the utility model relates to one kind, and the image using the fixing device Form 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 elastic component of fixing belt inner surface, and generate heat accessory plate and fixing belt Inner surface be sliding contact, for improve sliding effect, be 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 the bullet of elastic component Power 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, correspondingly, The smaller then easier width dimensions for reducing fever accessory plate of the elastic force of elastic component, but after the elastic force of elastic component dies down, fever The pressure that accessory plate abuts fixing belt inner surface can also die down, in the friction of fever accessory plate and fixing belt and the adsorption capacity of silicone grease Etc. under factors, noise can be generated or noise is made to become larger.

Utility model content

The fixing device of noise when can reduce work the purpose of the utility model is to provide one kind, and filled using the fixing The image forming apparatus set.

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 elastic component of promotion, rotatable shaft is installed on the fixed frame, is fixed on the shaft and the elasticity The eccentric wheel of part contact, the relatively described elastic component of the eccentric wheel squeeze the elastic component at maximum eccentric position, The elastic component is not squeezed in minimum eccentric position.

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 elastic component pushed far from the fixed frame direction, being equipped on the fixed frame can The shaft of rotation is fixed with the eccentric wheel contacted with the elastic component, the relatively described elasticity of the eccentric wheel on the shaft Part squeezes the elastic component at maximum eccentric position, does not squeeze the elastic component in minimum eccentric position.

The utility model can be inserted in fever accessory plate to fixed by adjusting the state for the eccentric wheel being mounted on shaft When in shadow bands, reduce the elastic force that fever accessory plate and adjustable shelf are subject to, is easily inserted into fever accessory plate in fixing belt；And it inserts After being attached to position, and the normal elastic force that fever accessory plate and adjustable shelf are born can be restored, be improved in the case where not influencing assemblability The receiving pressure of fixing belt, prevents the generation of noise while facilitating installation.

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 elastic component in Fig. 3 by compressed status diagram；

Fig. 5 is that fixing device installs the schematic diagram into image forming apparatus in one embodiment of the utility model.

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 at high temperature during rotation, completes fixing.

As shown in figure 3, the fever accessory plate 394 being located inside fixing belt 390 is mounted on a fixed frame 398, solid Determine to be provided with the adjustable shelf 399 that can be moved in the diametrical direction of fixing belt 390 on frame 398, meanwhile, pacify on fixed frame 398 Equipped with by adjustable shelf 399 to the elastic component 395 pushed far from 398 direction of fixed frame, and it is axial parallel with fixing belt 390 and can The shaft 396 of rotation is fixed with the eccentric wheel 397 contacted with elastic component 395 on shaft 396.

The relatively fixed frame 398 of the adjustable shelf 399 being mounted in fixing belt 390 can move freely, elastic under normal condition Part 395 is pushed to the direction far from fixed frame 398, and is connected to the inner surface of fixing belt 390, while fixed frame 398 is also in bullet It is adjacent under the reaction force of property part 395 with the inner surface of 390 opposite side of fixing belt.

When shaft 396 rotates, eccentric wheel 397 can be rotated synchronously, and eccentric wheel 397 is in maximum eccentric position and elastic component When 395 contact, as shown in figure 4, can squeeze elastic component 395, elastic component 395 is limited in fixed frame with compressive state It on 398, reduces elastic component 395 and is applied to the elastic force on adjustable shelf 399, in this state, to fever accessory plate 394 and adjustable shelf 399, which apply lesser power, can reduce width (width i.e. with respect to fixing belt diametrically) between the two, to facilitate insertion Into fixing belt 390.

Here maximum eccentric position refers to the position on eccentric wheel 397 apart from shaft 396 when farthest, and minimum eccentric position It sets and refers to position nearest apart from shaft 397 on eccentric wheel 397.

When eccentric wheel 397 is contacted with minimum eccentric position and elastic component 395, as shown in figure 3, eccentric wheel 397 will not limit Elastic component 395 processed is applied to the elastic force on adjustable shelf 399, or is applied to the elastic force on adjustable shelf 399 to elastic component 395 It influences to be in minimum state, this state has been inserted for fever accessory plate 394 to fixing belt 390, is released to elastic component 395 Limitation when use, enable to generate heat accessory plate 394 and adjustable shelf 399 apply normal pressure to fixing belt 390.

Present embodiment, can be in fever accessory plate by adjusting the state for the eccentric wheel 397 being mounted on shaft 396 When in 394 insertings to fixing belt 390, reduces the elastic force that fever accessory plate 394 and adjustable shelf 399 are subject to, make the accessory plate 394 that generates heat It is easily inserted into fixing belt 390；And after inserting in place, and can restore to generate heat accessory plate 394 and adjustable shelf 399 bear normal bullet Power improves the receiving pressure of fixing belt in the case where not influencing assemblability, the production of noise is prevented while facilitating installation It is raw.

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, elastic component 395 can use spring, one end of spring and fixed frame 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 and the elastic force direction of spring are identical, under the structure, eccentric wheel 397 and cunning Dynamic seat 391 contacts, can not be corresponding with spring position.Preferably the elastic force of spring can be fed back using the structure of sliding seat 391 Onto adjustable shelf 399.

Sliding seat 391 and the sliding connection structure of fixing seat 398 can be the strip groove being arranged on fixed frame 398 (not shown), the length direction of strip groove and the elastic force direction of spring are identical, and sliding seat 391 can be directly clamped among strip groove It is interior, and slided in strip groove under the elastic force of spring, to push the adjustable shelf 399 of connection close to fixed frame 3983 or separate Fixed frame 398.Sliding connection structure is also possible to the structures such as guide rail, ball screw in other embodiments, as long as making to slide Seat 391 can move freely in the horizontal direction.

As shown in figure 5, can install and control in the end of fixing belt 390 in an embodiment of the utility model The external gear 3901 that shaft 396 rotates, when in the installation to the ontology 11 of image forming apparatus 100 of fixing belt 390, the external gear 3901 are connected by power with image forming apparatus 100, then can be controlled by the operation panel 13 of image forming apparatus 100 outer The rotation of gear 3901；Present embodiment can control shaft 396 as needed and turn in fixing belt 390 during the work time It is dynamic, to adjust position of the eccentric wheel 397 with respect to sliding seat 391, to realize the adjusting for applying pressure size to fixing belt 390. The contact position of eccentric wheel 397 and sliding seat 391 is fixing belt by maximum eccentric distance to the range of minimum eccentric distance 390 bear pressure from it is small greatly to adjustable range.

Present embodiment can be automatically brought into operation after fixing device 39 is fixed in image forming apparatus 100 from outside Rotating to change the pressure size of the receiving of fixing belt 390 for shaft 396, fixes fixing belt 390 again manually compared to the prior art The mode of rotating shaft rod 396, it is easier to and it is safer.

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 elastic component pushed far from the fixed frame direction on the fixed frame, and feature exists In being equipped with rotatable shaft on the fixed frame, the bias contacted with the elastic component be fixed on the shaft Wheel, the relatively described elastic component of the eccentric wheel squeeze the elastic component at maximum eccentric position, in minimum eccentric position The elastic component is not squeezed when setting.

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

The elastic component is spring, and one end of the spring is connect with the fixed frame, and the other end is connect with sliding seat, the cunning Dynamic seat connect with adjustable shelf and is slidably mounted on the adjustable shelf, the bullet of the glide direction of the sliding seat and the spring Power direction is identical, and the eccentric wheel is contacted with the sliding seat.

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

The external gear for controlling the shaft rotation is installed in the end of the fixing belt, the external gear and external impetus connect It connects, when the external impetus drives external gear rotation, the shaft is driven to rotate in the fixing belt, by described The contact position of the relatively described sliding seat of eccentric wheel adjusts the pressure size that the fixing belt is born.

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

The longitudinal cross-section of the fever accessory plate is arc, and is contacted by extrados with the inner surface of the fixing belt.

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

The fixed frame is fixed by the arc-shaped inner surface of arcuate structure and the fever accessory plate.

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 elasticity far from fixed frame direction promotion on the fixed frame Part is equipped with rotatable shaft on the fixed frame, and the bias contacted with the elastic component is fixed on the shaft Wheel, the relatively described elastic component of the eccentric wheel squeeze the elastic component at maximum eccentric position, in minimum eccentric position The elastic component is not squeezed when setting.

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

The elastic component is spring, and one end of the spring is connect with the fixed frame, and the other end is connect with sliding seat, the cunning Dynamic seat connect with adjustable shelf and is slidably mounted on the adjustable shelf, the bullet of the glide direction of the sliding seat and the spring Power direction is identical, and the eccentric wheel is contacted with the sliding seat.

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

The external gear for controlling the shaft rotation is installed in the end of the fixing belt, the external gear and operation panel control Power part connection drive the shaft to rotate in the fixing belt when power part drives external gear rotation, with The pressure size that the fixing belt is born is adjusted by the contact position of the relatively described sliding seat of the eccentric wheel.

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

The longitudinal cross-section of the fever accessory plate is arc, and is contacted by extrados with the inner surface of the fixing belt.

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

The fixed frame is fixed by the arc-shaped inner surface of arcuate structure and the fever accessory plate.