CN205193437U - Fixing device - Google Patents

Abstract

The utility model provides a fixing device possesses: the annular band, the hold assembly, supporting components, and the hold assembly between the cyclic annular area of centre gripping to and the annular band between form the clamping part, the heater generates heat in the inboard of annular band, and reflection part, dispose between hold assembly and heater, in the future the heat of self -heating ware is to the inner peripheral surface reflection of annular band, on the clamping part will write down the predetermined direction of transfer conveying of sheet edge and write down the sheet with the developer like the photographic fixing, the reflection part has the central part, upper reaches extension and low reaches extension, the central part has the thermal plane of reflection that the reflection comes from the heater, upper reaches extension is followed the head -end bending of central part and is extended to the upstream side on the direction of transfer, the low reaches extension extends from crooked the side downriver of low reaches end of central part on the direction of transfer, upper reaches extension is close to supporting components than low reaches extension, the plane of reflection has the inclined plane that is close to the crustal inclination along with the upper reaches towards the direction of transfer to supporting components.

Description

Fixing device

Technical field

The utility model relates to a kind of fixing device for being fixed on by developer on recording sheet.

Background technology

All the time, as fixing device, be known in the gripping ring-like band between hold assembly and backer roll contacted with the inner peripheral surface of endless belt, recording sheet is fixed on the structure on recording sheet by the clamping part formed between endless belt and backer roll along predetermined direction of transfer transmission and by developer picture heat.

In such fixing device, such as, disclosed in patent documentation 1, have: well heater, generate heat in the inner side of endless belt; And reflection part, be configured between hold assembly and well heater, and the heat from well heater is reflected to the inner peripheral surface of endless belt.

This reflection part possesses: central portion, has the reflecting surface of reflection from the heat of well heater; Upstream extension, upstream extends from the upstream extremity of central portion in the transmission direction; And downstream extension, extend from the downstream end of central portion to downstream in the transmission direction.

Prior art document

Patent documentation

Patent documentation 1: U.S. Patent Publication No. 2012/0008971 publication (FIG.23)

Utility model content

Above-mentioned fixing device is in the past configured to be evenly dispersed in the upstream region on the above-mentioned direction of transfer of the inner peripheral surface of endless belt and the downstream area on above-mentioned direction of transfer respectively by the heat of the well heater of reflecting member reflects.In the above-mentioned downstream area of the inner peripheral surface of endless belt, the heat of accumulation of heat is difficult to efficiently to clamping part transmission, thus is difficult to developer picture is fixed on recording sheet well.

Therefore, the purpose of this utility model is, developer picture is fixed on recording sheet well.

A mode of fixing device of the present utility model is possess: endless belt, hold assembly, extends in the inner side of described endless belt, support unit, clamps described endless belt between described hold assembly, and forms clamping part between described endless belt, well heater, generates heat in the inner side of described endless belt, and reflection part, be configured between described hold assembly and described well heater, heat from described well heater is reflected to the inner peripheral surface of described endless belt, at described clamping part, developer picture is fixed on recording sheet along predetermined direction of transfer transmission by recording sheet, wherein, described reflection part has central portion, upstream extension and downstream extension, described central portion has the reflecting surface of reflection from the heat of described well heater, described upstream extension bends and upstream side extension from the upstream extremity of described central portion on described direction of transfer, described downstream extension bends from the downstream end of described central portion and extends to downstream on described direction of transfer, described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support unit, the reflecting surface of described central portion has dip plane, this dip plane to tilt to the mode that described support unit is close from described hold assembly along with the upstream towards described direction of transfer on the direction of described support unit.

In addition, also can be, described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support unit preset distance, described preset distance is in the scope of 1 ~ 30mm.

In addition, also can be, described preset distance be in the scope of 1 ~ 20mm.

In addition, also can be, described preset distance be in the scope of 1 ~ 10mm.

In addition, also can be, described dip plane at least extends to the central authorities on the described direction of transfer of described clamping part from the downstream the described direction of transfer of described well heater, the described dip plane of described reflection part is crossed the described central authorities of described clamping part further and extends to the upstream side on described direction of transfer.

In addition, also can be that the described dip plane of described reflection part has: the first dip plane; And second dip plane, be configured at upstream side on the described direction of transfer of described first dip plane and relative to described direction of transfer rake ratio described in the first dip plane little.

In addition, also can be, described well heater is the shape elongated towards the length direction of the opening of the opposing party from the opening of a side at described endless belt in the inner side of described endless belt, and the described reflecting surface of described reflection part is the concave shape caved in the direction away from described well heater when observing from described length direction.

In addition, also can be that described reflection part is the reflecting plate comprising sheet metal, the thickness of described reflecting plate be in the scope of 0.05 ~ 5mm, and described hold assembly is the grip block comprising sheet metal, and the thickness of described grip block is in the scope of 0.05 ~ 5mm.

In addition, also can be, described support unit comprises roller, described hold assembly on the length direction of described endless belt than described ring-type belt length, described reflection part on the length direction of described endless belt than described ring-type belt length, described well heater is than described ring-type belt length on the length direction of described endless belt, and described upstream extension is the upstream flange extended along described direction of transfer, and described downstream extension is the downstream flange along described direction of transfer extends.

In addition, also can be that the upstream extremity on the described direction of transfer of described clamping part is configured at the upstream side of described well heater, the downstream end on the described direction of transfer of described clamping part be configured at the downstream of described well heater.

In addition, also can be, described fixing device also possesses the metal framework be configured between described reflection part and described hold assembly, described metal framework on the length direction of described endless belt than described ring-type belt length, described metal framework is formed to the groove extended towards the direction opening of described hold assembly and along described length direction from described support unit, being configured at least partially in the described groove of described metal framework of the described dip plane of described reflection part.

In addition, also can be, described metal framework has: upstream wall, and the described upstream extension to described reflection part extends, and has the front end relative with described upstream extension; And downstream wall, described downstream extension to described reflection part extends, and there is the front end relative with described downstream extension, the downstream wall of described metal framework is longer than the upstream wall of described metal framework on the direction of described hold assembly from described support unit.

In addition, also can be, described reflection part has: upstream is fixed portion, bends and extends, extend with crossing the described front end of the described upstream wall of described metal framework towards described support unit from the upstream extremity the described direction of transfer of described upstream extension, and downstream is fixed portion, bend from the downstream end the described direction of transfer of described downstream extension and extend, cross the described front end of the described downstream wall of described metal framework towards described support unit extend, the portion that is fixed, described upstream of described reflection part is fixed in the described upstream wall of described metal framework in primary importance, the portion that is fixed, described downstream of described reflection part is fixed in the described downstream wall of described metal framework in the described second place, described primary importance from described hold assembly on the direction of described support unit than the described second place near described support unit.

In addition, also can be, described fixing device also possesses the resinous framework being configured between described metal framework and described hold assembly and supporting described hold assembly, described resinous framework on the length direction of described endless belt than described ring-type belt length, described resinous framework is formed to the groove extended towards the direction opening of described hold assembly and along described length direction from described support unit, being configured at least partially in the described groove of described resinous framework of described metal framework.

In addition, also can be that described resinous framework is at least one in liquid crystal plastics framework, fluorine resin framework.

In addition, also can be, described resinous framework has: upstream wall, and the described upstream extension to described reflection part extends, and has the front end relative with described upstream extension; And downstream wall, described downstream extension to described reflection part extends, and there is the front end relative with described downstream extension, the downstream wall of described resinous framework is longer than the upstream wall of described resinous framework on the direction of described hold assembly from described support unit.

In addition, also can be, described reflection part has: upstream is fixed portion, bends and extends, extend with crossing the described front end of the described upstream wall of described resinous framework towards described support unit from the upstream extremity the described direction of transfer of described upstream extension, and downstream is fixed portion, bend from the downstream end the described direction of transfer of described downstream extension and extend, cross the described front end of the described downstream wall of described resinous framework towards described support unit extend, the portion that is fixed, described upstream of described reflection part is fixed in the described upstream wall of described resinous framework in primary importance, the portion that is fixed, described downstream of described reflection part is fixed in the described downstream wall of described resin frame in the described second place, described primary importance from described hold assembly on the direction of described support unit than the described second place near described support unit.

According to the utility model, compared with the downstream area of the inner peripheral surface of endless belt, more effectively can supply heat to the upstream region of the inner peripheral surface of endless belt, therefore, it is possible to make developer picture be fixed on well on recording sheet.

Accompanying drawing explanation

Fig. 1 is the synoptic diagram of printer 1.

Fig. 2 is the central cross sectional view of fixing device 5.

Fig. 3 is structure ASSY and the enlarged drawing near it.

Fig. 4 is by reflecting plate 56 and the figure that amplifies near it.

Fig. 5 is the exploded perspective view of the upstream observation structure body ASSY from direction of transfer (FD).

Fig. 6 is the stereographic map observing reflecting plate 56 from the downstream of direction of transfer (FD).

Fig. 7 is the central section of the fixing device 5 of variation 1.

Fig. 8 is the figure observing the reflecting plate 56 of variation 2 from the upstream side of direction of transfer (FD).

Fig. 9 is the exploded perspective view of the structure ASSY of variation 3.

Embodiment

With reference to suitable accompanying drawing, an embodiment of the present utility model is described in detail.In addition, in the following description, first, the summary of printer 1 of the electrofax mode possessing fixing device 5 is illustrated, the detailed content of fixing device 5 is described afterwards.

The Sketch > of < printer 1

First, the Sketch of printer 1 is described.As shown in Figure 1, printer 1 possesses housing 10.Printer 1 also possesses the paper feed 2, transfer device 3, exposure device 4 and the fixing device 5 that configure in the inside of housing 10.Printer 1 also possesses paper delivery device for sheet 9.

Paper feed 2 possesses pallet 21, pick-up roller 23, paper feed roller 241, the driven voller 243 adjacent with paper feed roller 241, registration roller 251 and the driven voller 253 adjacent with registration roller 251.Transfer device 3 possesses photosensitive drums 31 and can form the transfer roll 33 of transfer nip between photosensitive drums 31.Exposure device 4 possesses semiconductor laser and lens.Fixing device 5 possesses endless belt 51 and can form the backer roll PR in fixing nip portion between endless belt 51.Paper delivery device for sheet 9 possesses exit roller 91, the driven voller 93 adjacent with exit roller 91 and discharge tray 94.In addition, discharge tray 94 is a part for housing 10.

< prints action >

Then, the printing action of printer 1 is described.Printer 1, when connecting electric power to printer 1 and printer 1 receives print command, performs this printing action.

When printer 1 receives print command, pick-up roller 23 picks up the paper P of mounting on pallet 21 and transmits.The paper P sent from pick-up roller 23 transmits to downstream by paper feed roller 241 and driven voller 243 further.Paper P, after the gradient of the front end by the paper P sent from paper feed roller 241 and driven voller 243 is adjusted, transmits to downstream by registration roller 251 and driven voller 253 further.

Exposure device 4 pairs of photosensitive drums 31 are irradiated light and form electrostatic latent image on the surface of photosensitive drums 31.This electrostatic latent image is developed by the surface supply developer of never illustrated developer roll to photosensitive drums 31 and is become developer picture.The developer picture that the surface that transfer roll 33 is transferred in photosensitive drums 31 at the paper P transmitted from registration roller 251 to transfer nip is formed.

Developer picture heat, when paper P is sent to the fixing nip portion formed between endless belt 51 and backer roll PR by transfer device 3, is fixed on paper P by fixing device 5.The paper P that fixing device 5 transmits by exit roller 91 and driven voller 93 discharges on discharge tray 94.

The detailed construction > of < fixing device

Then, the detailed construction of fixing device 5 is described.Fig. 2 is the central cross sectional view of fixing device 5.

As shown in Figure 2, fixing device 5 possesses endless belt 51, the heater H TR extended in the inner side of endless belt 51, to extend in the inner side of endless belt 51 and the grip block 52 that can contact with the inner peripheral surface of endless belt 51, the fixed mount 53 of the example as support component extended in the inner side of endless belt 51, the thermal insulation material 55 extended in the inner side of endless belt 51, the reflecting plate 56 extended in the inner side of endless belt 51 and the outside that is configured in endless belt 51 and the backer roll PR of the example as support unit that can rotate around rotation AXIS.

Grip block 52, thermal insulation material 55, reflecting plate 56 and fixed mount 53 are assembled and become structure ASSY.Fixing device also possesses the not shown spring for pressing fixed mount 53.Paper P transmits to predetermined direction of transfer (FD) at fixing nip portion N by fixing device.

Endless belt 51 has the release layer on the surface of basic unit and covering basic unit.Basic unit can for comprising the metal level of SUS (stainless steel) or nickel alloy etc., also can for comprising the resin bed of polyimide resin etc.Also various adjuvant can be comprised in basic unit.Such as when basic unit is resin bed, resin bed also can comprise metal, pottery, carbon or resin etc. as adjuvant.

Release layer is for comprising the resin bed of the fluororesin of PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) or PTFE (teflon) etc.This release layer also can comprise carbon etc. as adjuvant.Endless belt 51 can also possess the elastic layer configured between basic unit and release layer.Elastic layer can be such as the silastic-layer etc. of thermotolerance.Elastic layer also can comprise carbon, pottery or metal etc. as adjuvant.

Endless belt 51 has barrel shape, has inner peripheral surface 51IN and outer peripheral face 51OT, and extends along the rotation AXIS of backer roll PR.The thickness of endless belt 51 is such as in the scope of tens of μm ~ hundreds of μm.The thickness of endless belt 51 such as also can be in the scope of 5 ~ 800 μm, also can be in the scope of 10 ~ 500 μm, also can be in the scope of 10 ~ 300 μm, also can be in the scope of 10 ~ 200 μm.

Heater H TR is longer than endless belt 51 on the length direction of endless belt 51, and extends in the inner side of endless belt 51.Further, extend in the mode of two not shown openings of through endless belt 51.That is, the length direction of heater H TR and the length direction of thermal insulation material 55 almost parallel.Heater H TR can be Halogen lamp LED, also can be carbon heater etc.Heater H TR also can be infrared heater.Heater H TR has such as glass tube and is configured in the heater of inside of glass tube.Here, the direction (axis direction) that extends of the length direction of thermal insulation material 55 and the rotation AXIS of backer roll PR is almost parallel.

Grip block 52 is grown than endless belt 51 and can be contacted with the inner peripheral surface of endless belt 51 on the length direction of endless belt 51.The length direction of grip block 52 and the length direction of thermal insulation material 55 almost parallel.Described grip block 52 is that SUS (stainless steel) plate and aluminium sheet etc. can the sheet metals of elastic deformation, also can have acidifying overlay film and fluororesin film etc. as top layer.The thickness of slab of grip block 52 such as can be in the scope of 0.05 ~ 5mm, also can be in the scope of 0.1 ~ 3mm, also can be in the scope of 0.5 ~ 2mm, also can be in the scope of 0.9 ~ 1.5mm.

As shown in Figure 2, grip block 52 possess upstream extension 52A, downstream configuration on the direction of transfer (FD) of upstream extension 52A downstream extension 52B and connect the central portion 52C of upstream extension 52A and downstream extension 52B.

As shown in Figure 2, the central portion 52C of grip block 52 extends to downstream from the upstream of heater H TR on direction of transfer (FD).Upstream extension 52A bends from the upstream extremity the direction of transfer (FD) of central portion 52C and extends, and extends to the direction away from backer roll PR.Downstream extension 52B bends from the downstream end the direction of transfer (FD) of central portion 52C and extends, and extends to the direction away from backer roll PR.Downstream extension 52B is growing than upstream extension 52A away from the direction of this backer roll.Grip block 52 forms the groove caved in towards the direction towards fixing nip portion N, and has roughly U-shaped.

Reflecting plate 56 is longer than endless belt 51 on the length direction of endless belt 51, as shown in Figure 2, is configured between heater H TR and grip block 52.That is, the length direction of reflecting plate 56 and the length direction of endless belt 51 almost parallel.

Reflecting plate 56 possesses the reflecting part 56C of an example of upstream portion 56A, the downstream portion 56B of downstream configuration on the direction of transfer (FD) of upstream portion 56A and the central portion as connection upstream portion 56A and downstream portion 56B.

As shown in Figure 2, the reflecting part 56C of reflecting plate 56 extends to downstream from the upstream of heater H TR on direction of transfer (FD).Reflecting part 56C has relative with heater H TR and for being reflected to the inner peripheral surface 51IN of endless belt 51 by the radiations heat energy from heater H TR reflecting surface.

Upstream portion 56A bends from the upstream extremity 56CU the direction of transfer (FD) of reflecting part 56C to the upstream of direction of transfer (FD) and extends.Downstream portion 56B bends from the downstream end 56CD the direction of transfer (FD) of reflecting part 56C to the downstream on direction of transfer (FD) and extends.By above-mentioned structure, reflecting plate 56 is the groove caved in the direction away from fixing nip portion N.

Further, reflecting plate 56 is configured to the majority covering fixed mount 53.Further, the majority of fixed mount 53 and the majority of thermal insulation material 55 are configured between grip block 52 and reflecting plate 56, and by grip block 52 and reflecting plate 56 around.

Reflecting plate 56 is the sheet metal such as aluminium sheet or SUS (stainless steel) plate, and at least relative with heater H TR face is by mirror finish.The thickness of slab of reflecting plate 56 such as can be in the scope of 0.05 ~ 5mm, also can be in the scope of 0.1 ~ 3mm, also can be in the scope of 0.5 ~ 2mm, also can be in the scope of 0.9 ~ 1.5mm.

As shown in Figure 2, fixed mount 53 is configured between reflecting plate 56 and grip block 52, and possess upstream wall 53A, downstream configuration on the direction of transfer (FD) of upstream wall 53A downstream wall 53B and connect the median wall 53C of upstream wall 53A and downstream wall 53B.

As shown in Figure 2, the median wall 53C of fixed mount 53 extends to downstream from the upstream of heater H TR on direction of transfer (FD).Size on the direction of transfer (FD) of the median wall 53C of fixed mount 53 is less than the size on the direction of transfer (FD) of the reflecting part 56C of reflecting plate 56.The upstream wall 53A of fixed mount 53 bends from the upstream extremity the direction of transfer (FD) of median wall 53C and extends, and extends to the direction away from backer roll PR.The downstream wall 53B of fixed mount 53 bends from the downstream end the direction of transfer (FD) of median wall 53C and extends, and extends to the direction away from backer roll PR.Downstream wall 53B is growing than upstream wall 53A away from the direction of this backer roll.Further, upstream wall 53A apart from backer roll PR front end face farthest than downstream wall 53B apart from backer roll PR front end face farthest near backer roll PR.By above-mentioned structure, fixed mount 53 forms the groove caved in towards the direction towards fixing nip portion N, and has roughly U-shape.

Fixed mount 53 is the metal frameworks such as SUS (stainless steel) framework, aluminium chassis or iron frame, and rigidity is than grip block 52 and thermal insulation material 55 height.Upstream wall 53A, the downstream wall 53B of fixed mount 53 and median wall 53C thickness separately such as can be in the scope of 2.0 ~ 25mm, also the scope of 5.0 ~ 15mm can be in, also can be in the scope of 0.9 ~ 10mm, also can be in the scope of 1.0 ~ 9.0mm.Further, fixed mount 53 is longer than any one in endless belt 51, grip block 52, reflecting plate 56, heater H TR and thermal insulation material 55 on the length direction of endless belt 51.That is, the length direction of fixed mount 53 and the length direction of endless belt 51 almost parallel.

Backer roll PR has the elastic layer EST of the majority of axle SFT and covering axle SFT, and can rotate around rotation AXIS as illustrated in fig. 2.By gripping ring-like band 51 between grip block 52, fixing nip portion N can be formed between endless belt 51.

As shown in Figure 2, thermal insulation material 55 is clamped between fixed mount 53 and grip block 52, and possess upstream wall 55A, downstream configuration on the direction of transfer (FD) of upstream wall 55A downstream wall 55B and connect the median wall 55C of upstream wall 55A and downstream wall 55B.

As shown in Figure 2, the median wall 55C of thermal insulation material 55 extends to downstream from the upstream of heater H TR on direction of transfer (FD).Size on the direction of transfer (FD) of the median wall 55C of thermal insulation material 55 is larger than the size on the direction of transfer (FD) of the median wall 53C of fixed mount 53.The upstream wall 55A of thermal insulation material 55 bends from the upstream extremity the direction of transfer (FD) of median wall 55C and extends, and extends to the direction away from backer roll PR.Downstream wall 55B bends from the downstream end the direction of transfer (FD) of median wall 53C and extends, and extends to the direction away from backer roll PR.Downstream wall 55B is longer than upstream wall 55A on the direction away from this backer roll PR.Further, upstream wall 55A apart from backer roll PR front end face farthest than downstream wall 55B apart from backer roll PR front end face farthest near backer roll PR.

As shown in Figure 2, by above-mentioned structure, thermal insulation material 55 forms the groove caved in towards the direction towards fixing nip portion N, and has roughly U-shape.Thermal insulation material 55 is configured in the inner side of the groove that reflecting plate 56 is formed.Further, fixed mount 53 is configured in the inner side of the groove that thermal insulation material 55 is formed, and fixed mount 53 is chimeric with the groove that thermal insulation material 55 is formed, and at the groove medial support thermal insulation material 55 that thermal insulation material 55 is formed.

The median wall 55C of thermal insulation material 55 is configured in the groove that grip block 52 formed.The median wall 55C of thermal insulation material 55 has upstream support face 551 and the downstream support face 553 of the central portion 52C supporting grip block 52.Downstream support face 553 is configured at the downstream on direction of transfer (FD) away from ground, upstream support face 551.The median wall 55C of thermal insulation material 55 has the recess 555 caved in the direction away from grip block 52 between upstream support face 551 and downstream support face 553.This recess 555 is spaced apart with the central portion 52C of grip block 52, and forms gap between the central portion 52C of grip block 52.

Thermal insulation material 55 be rigidity than fixed mount 53 and grip block 52 low and be difficult to the parts of transferring heat (pyroconductivity is low), and be the heat stable resin framework such as fluorine resin framework or LCP (LiquidCrystalPlastic: liquid crystal plastics) framework.Upstream wall 55A, the downstream wall 55B of thermal insulation material 55 and median wall 55C thickness separately such as can be in the scope of 2.0 ~ 25mm, also the scope of 5.0 ~ 15mm can be in, also can be in the scope of 0.9 ~ 10mm, also can be in the scope of 1.0 ~ 9.0mm.

The action summary > of < fixing device 5

Then, the summary of the fixing action of fixing device 5 is described.The fixing action of this fixing device 5 produces when printing action.

Grip block 52 is pressed against backer roll PR by the acting force of not shown spring via fixed mount 53 and thermal insulation material 55.Grip block 52 and backer roll PR by pressing grip block 52 in the above described manner between grip block 52 and backer roll PR gripping ring-like band 51, between endless belt 51 and backer roll PR, form fixing nip portion N.The action forming this fixing nip portion N can perform when printing action, but also can maintain fixing nip portion N all the time when not carrying out printing action.

Not shown motor drives backer roll PR, and as shown in Figure 2, backer roll PR rotates along the counter clockwise direction of Fig. 2 around rotation AXIS.By making backer roll PR rotate in this wise, as shown in Figure 2, endless belt 51 rotates along the clockwise direction in Fig. 2.

Heater H TR sends radiations heat energy by connecting electric power to heater H TR.Radiations heat energy from heater H TR reflects to the inner peripheral surface 51IN of endless belt 51 by reflecting plate 56.Endless belt 51 is heated and accumulation of heat by the radiations heat energy reflected from reflecting plate 56.The heat of accumulation transmits to fixing nip portion N by rotating by endless belt 51.

The developer picture that heat and pressure are imparted on paper P by clamping paper P at fixing nip portion N by the endless belt 51 of accumulation of heat and backer roll PR, thus developer picture heat is fixed on paper P.

< is used for the structural details > upstream reflected by the heat of heater H TR

Then, the structure for being reflected to the skew ground, upstream on the direction of transfer (FD) of the inner peripheral surface 51IN of endless belt 51 by the radiations heat energy sent from heater H TR is described in detail.Fig. 3 is structure for amplifying body ASSY and the enlarged drawing near it.

First, the detailed structure of reflecting plate 56 is described.As shown in Figure 3, the reflecting part 56C of reflecting plate 56 near backer roll PR, and is the concave shape to heater H TR opening than heater H TR.Specifically, reflecting part 56C has: the first dip plane 56CT1, is configured at the upstream on the direction of transfer (FD) of heater H TR; Second dip plane 56CT2, bends from the upstream extremity the direction of transfer (FD) of the first dip plane 56CT1 and extends; And the 3rd dip plane 56CT3, be configured at the upstream on the direction of transfer (FD) of heater H TR, and bend from the upper reaches end the direction of transfer (FD) of the second dip plane 56CT2 and extend.Here, in this manual, " near backer roll PR " refer to " from grip block 52 on the direction of backer roll PR near backer roll PR ".

First dip plane 56CT1 is to tilt relative to direction of transfer (FD) along with the mode towards the upstream on direction of transfer (FD) close to backer roll PR.First dip plane 56CT1 is configured at than the center CTR on the direction of transfer (FD) of fixing nip portion N by the upstream on direction of transfer (FD).Here, as shown in Figure 3, when observing from the length direction of heater H TR, heater H TR crosses the center CTR of fixing nip portion N and the circular shape that bloats to downstream from the upstream the direction of transfer (FD) of the center CTR of fixing nip portion N.Here, in this manual, " mode with close to backer roll PR " refers to " with in the mode from grip block 52 close to backer roll PR on the direction of backer roll PR ".

Fig. 4 amplifies reflecting plate 56 and the figure near it further.As shown in Figure 4, the first dip plane 56CT1 is by the opening 53OP of fixed mount 53 and extend, and is configured in the groove of fixed mount 53.Here, as shown in Figure 4, the opening 53OP of fixed mount 53 refers to the plane (double dot dash line) and its near zone that the downstream end on the direction of transfer (FD) of the distance backer roll PR end face farthest of the upstream wall 53A of fixed mount 53 are connected with the upstream extremity on the direction of transfer (FD) of the distance backer roll PR end face farthest of the downstream wall 53B of fixed mount 53, and towards the upstream on direction of transfer (FD).

As shown in Figure 4, the first dip plane 56CT1 is by the opening 55OP of thermal insulation material 55 and extend, and is configured in the groove of thermal insulation material 55.Here, as shown in Figure 4, the opening 55OP of thermal insulation material 55 refers to the plane (dotted line) and its near zone that the downstream end on the direction of transfer (FD) of the distance backer roll PR end face farthest of the upstream wall 55A of thermal insulation material 55 are connected with the upstream extremity on the direction of transfer (FD) of the distance backer roll PR end face farthest of the downstream wall 55B of thermal insulation material 55, and towards the upstream on direction of transfer (FD).

Second dip plane 56CT2 is to tilt relative to direction of transfer (FD) along with the mode towards the upstream on direction of transfer (FD) close to backer roll PR.The slope ratio first dip plane 56CT1's relative to direction of transfer (FD) of the second dip plane 56CT2 is little relative to the slope of direction of transfer (FD).Second dip plane 56CT2 crosses the center CTR of fixing nip portion N, and extends further to the center CTR than fixing nip portion N by the upstream on direction of transfer (FD).

As shown in Figure 4, the second dip plane 56CT2 is by the opening 53OP of fixed mount 53 and extend, and is configured in the groove of fixed mount 53.Further, as shown in Figure 4, the second dip plane 56CT2 is by the opening 55OP of thermal insulation material 55 and extend, and is configured in the groove of thermal insulation material 55.Size sum on size on the direction of transfer (FD) of the first dip plane 56CT1 and the direction of transfer (FD) of the second dip plane 56CT2 is than size one medium-sized of the direction of transfer (FD) of the reflecting part 56C of reflecting plate 56.

3rd dip plane 56CT3 is configured to than the downstream of the center CTR on the direction of transfer (FD) of fixing nip portion N by direction of transfer (FD), and to tilt relative to direction of transfer (FD) along with the mode towards the upstream on direction of transfer (FD) away from backer roll PR.

The upstream portion 56A of reflecting plate 56 has: upstream extension 56FU, bends from the upstream extremity 56CU the direction of transfer (FD) of the 3rd dip plane 56CT3 and extends, and extends to the upstream of direction of transfer (FD); And upstream is fixed portion 56AE, bends from the upstream extremity FUU the direction of transfer (FD) of upstream extension 56FU and extend, and extending towards the direction towards backer roll PR.Upstream extension 56FU is from the reflecting part 56C of the concavity flange outstanding to the upstream direction of transfer (FD).Formed towards the opening of the upstream of direction of transfer (FD) by the first above-mentioned dip plane 56CT1, the second dip plane 56CT2 and the 3rd dip plane 56CT3.

The downstream portion 56B of reflecting plate 56 has: downstream extension 56FD, bends from the downstream end 56CD the direction of transfer (FD) of the first dip plane 56CT1 and extends, and extends to the downstream of direction of transfer (FD); And downstream is fixed portion 56BE, bends from the downstream end 56FDD the direction of transfer (FD) of downstream extension 56FD and extend, and extending towards the direction towards backer roll PR.Downstream extension 56FD is from the reflecting part 56C of the concavity flange outstanding to the downstream direction of transfer (FD).As shown in Figure 4, downstream extension 56FD than upstream extension 56FU away from backer roll PR distance H.This distance H can be described as in the present embodiment along the distance on the paper above-below direction of Fig. 4, is alternatively the distance along the roughly orthogonal direction of the median wall 53C with fixed mount 53.Distance H can be 1 ~ 30mm, also can be 1 ~ 20mm, also can be 1 ~ 10mm, also can be 1 ~ 5mm.

The downstream portion 56BE that is fixed is longer than the upstream portion 56AE that is fixed on the direction towards this backer roll PR.

As shown in Figure 4, the 3rd dip plane 56CT3 is by the opening 53OP of fixed mount 53 and extend, and is configured in the groove of fixed mount 53.Further, as shown in Figure 4, the 3rd dip plane 56CT3 is by the opening 55OP of thermal insulation material 55 and extend, and is configured in the groove of thermal insulation material 55.

Fig. 5 is the exploded perspective view of the upstream observation structure body ASSY from direction of transfer (FD).As shown in Figure 5, reflecting plate 56, thermal insulation material 55 and grip block 52 is fixed on fixed mount 53 by six roots of sensation screw (SCR1 ~ SCR6).

As shown in Figure 5, the second upstream extension 56UE of reflecting plate 56 has: circular hole 56H, is formed at the central portion on the length direction of reflecting plate 56; Elongated hole 56EH, is formed at the end on the length direction of reflecting plate 56; And elongated hole 56EH, be formed at the other end contrary with an end on the length direction of reflecting plate 56.

Fig. 6 is the stereographic map observing reflecting plate 56 from the downstream direction of transfer (FD).As shown in Figure 6, the downstream of the reflecting plate 56 portion 56BE that is fixed has: circular hole 56H, is formed at the central portion on the length direction of reflecting plate 56; Elongated hole 56EH, is formed at the end on the length direction of reflecting plate 56; And elongated hole 56EH, be formed at the other end contrary with an end on the length direction of reflecting plate 56.

As shown in Figure 5, the upstream wall 53A of fixed mount 53 has: screw hole 53H, is formed at the central portion on the length direction of fixed mount 53; Screw hole 53H, is formed at the end on the length direction of fixed mount 53; And screw hole 53H, be formed at the other end contrary with an end on the length direction of fixed mount 53.

As shown in Figure 5, the downstream wall 53B of fixed mount 53 has: screw hole 53H, is formed at the central portion on the length direction of fixed mount 53; Screw hole 53H, is formed at the end on the length direction of fixed mount 53; And screw hole 53H, be formed at the other end contrary with an end on the length direction of fixed mount 53.

As shown in Figure 5, the upstream extension 52A of grip block 52 has: circular hole 52H, is formed at the central portion on the length direction of grip block 52; Elongated hole 52EH, is formed at the end on the length direction of grip block 52; And elongated hole 52EH, be formed at the other end contrary with an end on the length direction of grip block 52.

As shown in Figure 5, the downstream extension 52B of grip block 52 has: circular hole 52H, is formed at the central portion on the length direction of grip block 52; Elongated hole 52EH, is formed at the end on the length direction of grip block 52; And elongated hole 52EH, be formed at the other end contrary with an end on the length direction of grip block 52.

As shown in Figure 5, the upstream wall 55A of thermal insulation material 55 has: circular hole 52H, is formed at the central portion on the length direction of thermal insulation material 55; Elongated hole 52EH, is formed at the end on the length direction of thermal insulation material 55; And elongated hole 52EH, be formed at the other end contrary with an end on the length direction of thermal insulation material 55.

As shown in Figure 5, the downstream extension 52B of thermal insulation material 55 has: circular hole 52H, is formed at the central portion on the length direction of thermal insulation material 55; Elongated hole 52EH, is formed at the end on the length direction of thermal insulation material 55; And elongated hole 52EH, be formed at the other end contrary with an end on the length direction of thermal insulation material 55.

Screw SCR1 is screwed with in the screw hole 53H of one end of the upstream wall 53A on the length direction of fixed mount 53.One end of the end of upstream wall 53A on one end of the upstream extension 52A on the length direction of grip block 52, the length direction of fixed mount 53 and the upstream wall 55A on the length direction of thermal insulation material 55 is clamped in the end being fixed on the upstream wall 53A on the length direction of fixed mount 53 between an end of the upstream wall 53A on the length direction of fixed mount 53 and the head of screw of screw SCR1.

Screw SCR2 is screwed with in the screw hole 53H of the central portion of the upstream wall 53A on the length direction of fixed mount 53.The central portion of the central portion of upstream wall 53A on the central portion of the upstream extension 52A on the length direction of grip block 52, the length direction of fixed mount 53 and the upstream wall 55A on the length direction of thermal insulation material 55 is clamped in the central portion being fixed on the upstream wall 53A on the length direction of fixed mount 53 between the central portion of the upstream wall 53A on the length direction of fixed mount 53 and the head of screw of screw SCR2.

Screw SCR3 is screwed with in the screw hole 53H of the other end of the upstream wall 53A on the length direction of fixed mount 53.The other end of the other end of upstream wall 53A on the other end of upstream extension 52A on the length direction of grip block 52, the length direction of fixed mount 53 and the upstream wall 55A on the length direction of thermal insulation material 55 is clamped in the other end being fixed on the upstream wall 53A on the length direction of fixed mount 53 between the other end of the upstream wall 53A on the length direction of fixed mount 53 and the head of screw of screw SCR3.

Screw SCR4 is screwed with in the screw hole 53H of one end of the downstream wall 53B on the length direction of fixed mount 53.As shown in Figure 3, the screw hole 53H being screwed with the fixed mount 53 of this screw SCR4 is configured in position (UF) than the screw hole 53H of the fixed mount 53 being screwed with screw SCR1 away from the position (DF) of backer roll PR.One end of the end of downstream wall 53B on one end of the downstream extension 52B on the length direction of grip block 52, the length direction of fixed mount 53 and the downstream wall 55B on the length direction of thermal insulation material 55 is clamped in the end being fixed on the downstream wall 53B on the length direction of fixed mount 53 between an end of the downstream wall 53B on the length direction of fixed mount 53 and the head of screw of screw SCR4.

Screw SCR5 is screwed with in the screw hole 53H of the central portion of the downstream wall 53B on the length direction of fixed mount 53.As shown in Figure 3, the screw hole 53H being screwed with the fixed mount 53 of this screw SCR5 is configured in the position (upstream fixed position UF) of the position of the screw hole 53H than the fixed mount 53 being screwed with screw SCR2 (fixed position, downstream DF) away from backer roll PR.The central portion of the central portion of downstream wall 53B on the central portion of the downstream extension 52B on the length direction of grip block 52, the length direction of fixed mount 53 and the downstream wall 55B on the length direction of thermal insulation material 55 is clamped in the central portion being fixed on the downstream wall 53B on the length direction of fixed mount 53 between the central portion of the downstream wall 53B on the length direction of fixed mount 53 and the head of screw of screw SCR5.

Screw SCR6 is screwed with in the screw hole 53H of the other end of the downstream wall 53B on the length direction of fixed mount 53.As shown in Figure 3, the screw hole 53H being screwed with the fixed mount 53 of this screw SCR6 is configured in position (UF) than the screw hole 53H of the fixed mount 53 being screwed with screw SCR3 away from the position (DF) of backer roll PR.The other end of the other end of downstream wall 53B on the other end of downstream extension 52B on the length direction of grip block 52, the length direction of fixed mount 53 and the downstream wall 55B on the length direction of thermal insulation material 55 is clamped in the other end being fixed on the downstream wall 53B on the length direction of fixed mount 53 between the other end of the downstream wall 53B on the length direction of fixed mount 53 and the head of screw of screw SCR6.

By above-mentioned structure, grip block 52, thermal insulation material 55 and reflecting plate 56 are fixed on fixed mount 53 and become structure ASSY.

Then, the effect obtained by above-mentioned structure is described.

Because the first dip plane 56CT1 of reflecting plate 56 and the second dip plane 56CT2 is to tilt, therefore, it is possible to reflected efficiently to the upstream region on the direction of transfer (FD) of the inner peripheral surface 51IN of endless belt 51 by the radiations heat energy of heater H TR along with the mode towards the upstream on direction of transfer (FD) near backer roll PR.

Because reflecting plate 56 has from the bending and downstream extension 56FD that is that extends to the downstream of direction of transfer (FD) of the first dip plane 56CT1, therefore reflecting plate 56 rigidity raising and the assembling of reflecting plate 56 becomes easy.

Because reflecting plate 56 has from the bending and upstream extension 56FU that is that extend to the upstream direction of transfer (FD) of the 3rd dip plane 56CT3, therefore the rigidity of reflecting plate 56 improves and the assembling of reflecting plate 56 becomes easy.

The front end face of the upstream wall 53A of fixed mount 53 is configured to front end face than downstream wall 53B near backer roll PR by position relationship due to the upstream portion 56A and downstream wall 53B with reflecting plate 56 ordinatedly, and therefore operating personnel are easy to reflecting plate 56 to be assembled in fixed mount 53.

Be fixed fixed position, upstream UF that portion 56AE is fixed in fixed mount 53 of upstream due to reflecting plate 56 is fixed in fixed position, the downstream DF of fixed mount 53 near backer roll PR than the downstream of the reflecting plate 56 portion 56BE that is fixed, and therefore operating personnel are easy to reflecting plate 56 to be assembled in fixed mount 53.

By saving space by the groove being configured at fixed mount 53 at least partially of the first dip plane 56CT1 of reflecting plate 56, the second dip plane 56CT2 and the 3rd dip plane 56CT3.

Due to the upstream portion 56A of reflecting plate 56 and the position relationship of downstream portion 56B make ordinatedly the position of screw hole 53H1, the screw hole 53H2 of the example as fixed position, upstream and screw hole 53H3 than as screw hole 53H1, the screw hole 53H2 of an example of fixed position, downstream and the position of screw hole 53H3 near backer roll PR, therefore operating personnel are easy to reflecting plate 56 to be assembled in fixed mount 53.

Because the first dip plane 56CT1 of reflecting plate 56 is configured in the groove of thermal insulation material 55, therefore, it is possible to the groove effectively utilizing thermal insulation material 55 to be formed and make fixing device 5 miniaturization.Further, because the second dip plane 56CT2 of reflecting plate 56 is configured in the groove of thermal insulation material 55, therefore, it is possible to the groove effectively utilizing thermal insulation material 55 to be formed and make fixing device 5 miniaturization.And then, because the 3rd dip plane 56CT3 of reflecting plate 56 is configured in the groove of thermal insulation material 55, therefore, it is possible to the groove effectively utilizing thermal insulation material 55 to be formed and make fixing device 5 miniaturization.

Because the first dip plane 56CT1 of reflecting plate 56 is configured in the groove of fixed mount 53, therefore, it is possible to the groove effectively utilizing fixed mount 53 to be formed and make fixing device 5 miniaturization.Further, because the second dip plane 56CT2 of reflecting plate 56 is configured in the groove of fixed mount 53, therefore, it is possible to the groove effectively utilizing fixed mount 53 to be formed and make fixing device 5 miniaturization.And then, because the 3rd dip plane 56CT3 of reflecting plate 56 is configured in the groove of fixed mount 53, therefore, it is possible to the groove effectively utilizing fixed mount 53 to be formed and make fixing device 5 miniaturization.

Because the size sum on the direction of transfer (FD) of the size on the direction of transfer (FD) of the first dip plane 56CT1 and the second dip plane 56CT2 is than size one medium-sized of the direction of transfer (FD) of the reflecting part 56C of reflecting plate 56, therefore, it is possible to the radiations heat energy from heater H TR is reflected effectively to the upstream region on the direction of transfer (FD) of endless belt 51.

Cross the center CTR on the direction of transfer (FD) of fixing nip portion N due to the second dip plane 56CT2 and extend, therefore, it is possible to the radiations heat energy from heater H TR is reflected effectively to the upstream region on the direction of transfer (FD) of endless belt 51.

Then, various variation is described.Wherein, for the structure common with above-mentioned embodiment, omit the description.

< variation 1 >

Fig. 7 is the central section of the fixing device 5 of variation 1.In the above-described embodiment, the reflecting part 56C of reflecting plate 56 is the shape caved in towards the direction towards backer roll PR, but, as shown in Figure 6, the reflecting part 56C of reflecting plate 56 also can have from downstream extension 56FD to upstream extension 56FU with the dip plane 56CT of roughly uniform slope inclination.

< variation 2 >

Fig. 8 is the figure observing the reflecting plate 56 of variation 2 from the upstream side of direction of transfer (FD).In the above-described embodiment, downstream extension 56FD is the distance backer roll PR position farthest of reflecting plate 56, but downstream portion 56B also can have the teat 56BP more outstanding to the direction away from backer roll PR than downstream extension 56FD.Teat 56BP is by cutting and turning up a part of downstream portion 56B and formed.

< variation 3 >

Fig. 9 is the exploded perspective view of the structure ASSY of the fixing device 5 of variation 3.In the above-described embodiment, reflecting plate 56 is fixed on fixed mount 53 in the mode of screw fastening, but reflecting plate 56 also can be fixed on thermal insulation material 55.That is, as shown in Figure 9, also can be that the circular hole 56H that reflecting plate 56 has and elongated hole 56EH is fixed on locator protrusions 55AB and the locator protrusions 55BB of thermal insulation material 55.In addition, also can be that grip block 52 is also fixed on locator protrusions 55AB and the locator protrusions 55BB of thermal insulation material 55.In the present embodiment, thermal insulation material 55 is an example of support component.

Other variation > of <

In the above-described embodiment, as gripping ring-like band 51 between backer roll PR parts and exemplified with the grip block 52 of plate shape, but the hold assembly of block-shaped or soft cushion also can be adopted to replace this grip block 52.

In the above-described embodiment, hold assembly 52 is configured to the inner peripheral surface 51IN sliding contact via lubricant and endless belt 51, but hold assembly 52 also can be configured to the inner peripheral surface 51IN sliding contact via slip sheets and endless belt 51.

In the above-described embodiment, as support unit an example and exemplified with backer roll PR, but support unit also can be the parts of block-shaped or soft pulvilliform shape, can also be the parts of band shape.

In the above-described embodiment, dip plane is plane, but also can be the shape of curved sigmoid.

In the above-described embodiment, fixed mount 53 and thermal insulation material 55 are the parts arranged separately, but fixed mount 53 and thermal insulation material 55 also can replace with the resin component having thermotolerance and rigidity fully concurrently.

In the above-described embodiment, thermal insulation material 55 is configured between fixed mount 53 and grip block 52, but also can not have thermal insulation material 55.

Label declaration

1 printer

5 fixing devices

51 endless belts

52 grip blocks

53 fixed mounts

56 reflecting plates

55 thermal insulation materials

HRT well heater

PR backer roll.

Claims (17)

1. a fixing device,

Possess: endless belt;

Hold assembly, extends in the inner side of described endless belt;

Support unit, clamps described endless belt between described hold assembly, and forms clamping part between described endless belt;

Well heater, generates heat in the inner side of described endless belt; And

Reflection part, is configured between described hold assembly and described well heater, is reflected by the heat from described well heater to the inner peripheral surface of described endless belt,

At described clamping part, developer picture is fixed on described recording sheet along predetermined direction of transfer transmission by recording sheet,

The feature of described fixing device is,

Described reflection part has central portion, upstream extension and downstream extension, described central portion has the reflecting surface of reflection from the heat of described well heater, described upstream extension bends and upstream side extension from the upstream extremity of described central portion on described direction of transfer, described downstream extension bends from the downstream end of described central portion and extends to downstream on described direction of transfer

Described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support unit,

The reflecting surface of described central portion has dip plane, and this dip plane to tilt to the mode that described support unit is close from described hold assembly along with the upstream side towards described direction of transfer on the direction of described support unit.

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

Described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support component preset distance, described preset distance is in the scope of 1 ~ 30mm.

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

Described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support component preset distance, described preset distance is in the scope of 1 ~ 20mm.

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

Described upstream extension from described hold assembly on the direction of described support unit than described downstream extension near described support component preset distance, described preset distance is in the scope of 1 ~ 10mm.

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

Described dip plane at least extends to the central authorities on the described direction of transfer of described clamping part from the downstream the described direction of transfer of described well heater,

The described dip plane of described reflection part is crossed the described central authorities of described clamping part further and extends to the upstream side on described direction of transfer.

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

The described dip plane of described reflection part has:

First dip plane; And

Second dip plane, be configured at upstream side on the described direction of transfer of described first dip plane and relative to described direction of transfer rake ratio described in the first dip plane little.

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

Described well heater is the shape elongated towards the length direction of the opening of the opposing party from the opening of a side at described endless belt in the inner side of described endless belt,

The described reflecting surface of described reflection part is the concave shape caved in the direction away from described well heater when observing from described length direction.

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

Described reflection part is the reflecting plate comprising sheet metal, and the thickness of described reflecting plate is in the scope of 0.05 ~ 5mm,

Described hold assembly is the grip block comprising sheet metal, and the thickness of described grip block is in the scope of 0.05 ~ 5mm.

9. fixing device according to claim 8, is characterized in that,

Described support unit comprises roller,

Described hold assembly on the length direction of described endless belt than described ring-type belt length,

Described reflection part on the length direction of described endless belt than described ring-type belt length,

Described well heater on the length direction of described endless belt than described ring-type belt length,

Described upstream extension is the upstream flange extended along described direction of transfer,

Described downstream extension is the downstream flange along described direction of transfer extends.

10. fixing device according to claim 9, is characterized in that,

Upstream extremity on the described direction of transfer of described clamping part is configured at the upstream side of described well heater,

Downstream end on the described direction of transfer of described clamping part is configured at the downstream of described well heater.

11. fixing devices according to claim 8, is characterized in that,

Also possess the metal framework be configured between described reflection part and described hold assembly,

Described metal framework on the length direction of described endless belt than described ring-type belt length,

Described metal framework is formed to the groove extended towards the direction opening of described hold assembly and along described length direction from described support unit,

Being configured at least partially in the described groove of described metal framework of the described dip plane of described reflection part.

12. fixing devices according to claim 11, is characterized in that,

Described metal framework has: upstream wall, and the described upstream extension to described reflection part extends, and has the front end relative with described upstream extension; And

Downstream wall, the described downstream extension to described reflection part extends, and has the front end relative with described downstream extension,

The downstream wall of described metal framework is longer than the upstream wall of described metal framework on the direction of described hold assembly from described support unit.

13. fixing devices according to claim 11, is characterized in that,

Described reflection part has: upstream is fixed portion, bends and extends, extend with crossing the described front end of the described upstream wall of described metal framework towards described support unit from the upstream extremity the described direction of transfer of described upstream extension; And

Downstream is fixed portion, bends and extends, extend with crossing the described front end of the described downstream wall of described metal framework towards described support unit from the downstream end the described direction of transfer of described downstream extension,

The portion that is fixed, described upstream of described reflection part is fixed in the described upstream wall of described metal framework in primary importance,

The portion that is fixed, described downstream of described reflection part is fixed in the described downstream wall of described metal framework in the second place,

Described primary importance from described hold assembly on the direction of described support unit than the described second place near described support unit.

14. fixing devices according to any one in claim 11 ~ 13, is characterized in that,

Also possess the resinous framework being configured between described metal framework and described hold assembly and supporting described hold assembly,

Described resinous framework on the length direction of described endless belt than described ring-type belt length,

Described resinous framework is formed to the groove extended towards the direction opening of described hold assembly and along described length direction from described support unit,

Being configured at least partially in the described groove of described resinous framework of described metal framework.

15. fixing devices according to claim 14, is characterized in that,

Described resinous framework is at least one in liquid crystal plastics framework, fluorine resin framework.

16. fixing devices according to claim 14, is characterized in that,

Described resinous framework has: upstream wall, and the described upstream extension to described reflection part extends, and has the front end relative with described upstream extension; And

Downstream wall, the described downstream extension to described reflection part extends, and has the front end relative with described downstream extension,

The downstream wall of described resinous framework is longer than the upstream wall of described resinous framework on the direction of described hold assembly from described support unit.

17. fixing devices according to claim 16, is characterized in that,

Described reflection part has: upstream is fixed portion, bends and extends, extend with crossing the described front end of the described upstream wall of described resinous framework towards described support unit from the upstream extremity the described direction of transfer of described upstream extension; And

Downstream is fixed portion, bends and extends, extend with crossing the described front end of the described downstream wall of described resinous framework towards described support unit from the downstream end the described direction of transfer of described downstream extension,

The portion that is fixed, described upstream of described reflection part is fixed in the described upstream wall of described resinous framework in primary importance,

The portion that is fixed, described downstream of described reflection part is fixed in the described downstream wall of described resinous framework in the second place,

Described primary importance from described hold assembly on the direction of described support unit than the described second place near described support unit.