CN103359496B - Image forming apparatus - Google Patents

Abstract

A kind of image forming apparatus, including: image forming part, recording sheet is formed image；Apparatus main body, has and clips a pair relative framework of image forming part and connect the bridge member of a pair framework；Paper feed roller；Plate placed by sheet material, place recording sheet, sheet material in the approximated position near paper feed roller and can be placed the other end of plate can be supported on apparatus main body in the way of rotating in the way of mobile between the separate location of paper feed roller by the end placing plate and paper feed roller relative configuration by sheet material, moved to approximated position from separate location by an end, the recording sheet placed is lifted to paper feed roller；Carry component in tabular, be arranged in sheet material and place opposition side, plate recording sheet placed side, can be located remotely between the second position of position in the primary importance that the end making sheet material place plate is located adjacent to position and the end making sheet material place plate and move.On carry component so that bridge member can be supported in the way of rotating.

Description

Image forming apparatus

Technical field

The present invention relates to a kind of image forming apparatus, it has paper feed roller and is lifted to paper feed roller by the recording sheet placed Plate placed by the sheet material risen.

Background technology

In the past, as image forming apparatus, it is known that such a image forming apparatus, it has paper feed roller and will be placed The sheet material that the most upwards carries of recording sheet place plate.In this image forming apparatus, sheet material places plate to be arranged in paper supply The mode that an end below roller can move up and down makes the other end be rotatably supported at apparatus main body.And, at sheet material Place below this end of plate, be provided with the spring that this end is exerted a force upward.Additionally, in apparatus main body, be provided with logical Cross and place plate with sheet material and abuts and overcome the active force of spring thus limit the sheet material placement cam that is moved upward of plate, along with This cam rotates, and sheet material is placed this end of plate and moved up and down.

But, in the above-described techniques, although when this end that plate placed by sheet material is positioned at bottom, spring is compression State, but, even if spring is compressive state, the most also tool has the dimensions, the therefore volume of apparatus main body Correspondingly increase.

Summary of the invention

Then, it is an object of the present invention to provide a kind of image forming apparatus making apparatus main body miniaturization.

To achieve these goals, the present invention provides a kind of image forming apparatus, including: image forming part, in note Image is formed on record sheet material；Apparatus main body, it has a pair with clipping described image forming part facing framework and connects institute State the bridge member of a pair framework；Paper feed roller；Plate placed by sheet material, is used for placing described recording sheet, places plate with described sheet material The end configured face to face with described paper feed roller can near described paper feed roller approximated position and farthest away from The mode of movement between the separate location of described paper feed roller, places the other end of plate rotatably by described sheet material It is supported on described apparatus main body, is moved to described approximated position from described separate location by one end, described sheet material Place plate to be lifted to described paper feed roller by the described recording sheet placed；And tabular on carry component, be arranged in described The opposition side of the recording sheet placed side of plate placed by material, it is possible to be positioned at described in the one end making described sheet material place plate The primary importance of approximated position and the one end making described sheet material place plate are positioned at the second position of described separate location Between move.Carry component on described and be rotatably supported on described bridge member.

According to the present invention, be arranged in sheet material place plate recording sheet placed side opposition side, on carry sheet material and place plate On to carry component be rotary type, therefore, with spring etc., sheet material is placed the situation that plate upwards puies forward compared with, apparatus main body can be made little Type.

Accompanying drawing explanation

Fig. 1 is the figure of the Sketch illustrating the laser printer according to one embodiment of the present invention.

Fig. 2 is the axonometric chart illustrating a pair side frame body and bridge member.

Fig. 3 is to illustrate the axonometric chart that plate placed by housing and paper.

Fig. 4 is to observe housing and the axonometric chart of paper placement plate from below.

Fig. 5 is the schematic diagram of the Sketch illustrating housing and supply unit.

Fig. 6 is to illustrate bridge member and above carry the figure of component, and wherein, (a) illustrates that carrying component is positioned at the second position The axonometric chart of state, (b) is the axonometric chart illustrating and putting forward the state that component is positioned at primary importance, and (c) is the V-V profile of (b), Rotating shaft and supporting part are shown.

Fig. 7 is the figure illustrating each gear, and wherein, (a) is the axonometric chart of the first gear, (b) be illustrate the first gear with The axonometric chart in the face of the opposition side, face shown in (a), (c) is the axonometric chart of the second gear, (d) be the second gear is shown with (c) The axonometric chart in the face of shown opposition side, face, (e) is the first gear and the axonometric chart of the second gear, and (f) is to illustrate the first gear Axonometric chart with the face with the opposition side, face shown in (e) of the second gear.

Fig. 8 is the figure illustrating supply unit, wherein, the figure of supply unit when (a), (b) are to illustrate standby, (c) be illustrate from Figure with the supply unit that (a) opposition side is observed.

Fig. 9 is the figure illustrating supply unit, and wherein, (a), (b) are the figures illustrating supply unit when solenoid works, and (c) is Figure from the supply unit observed with (a) opposition side is shown.

Figure 10 is the figure illustrating supply unit, and wherein, (a), (b) are to illustrate the supply unit that paper is placed when plate begins to ramp up Figure, (c) is to illustrate the figure from the supply unit observed with (a) opposition side.

Figure 11 is the figure illustrating supply unit, and wherein, (a), (b) are the figures of the supply unit illustrating that paper feed roller starts when rotating, C () is to illustrate the figure from the supply unit observed with (a) opposition side.

Detailed description of the invention

It follows that suitably present invention will be described in detail with reference to the accompanying embodiment.It should be noted that following In explanation, first explanation is as the laser printer of an example of the image forming apparatus according to one embodiment of the present invention Overall structure, then describe in detail inventive feature part.

In the following description, the direction on the basis of user when direction uses in order to laser printer illustrates. I.e., in FIG, towards paper, left side is set to " front side ", towards paper, right side is set to " rear side ", towards paper, distally is set For " left side ", towards paper, nearside is set on " right side ".Additionally, above-below direction is set to " above-below direction " towards paper.

<Sketch of laser printer>

As it is shown in figure 1, laser printer 1 has: apparatus main body 2；For feeding as example of recording sheet The supply unit 3 of paper P；And for becoming the image forming part 4 of image in paper p-shaped.

Apparatus main body 2 has: housing 100；Upper cover 22；And protecgulum 23.Housing 100 has at an upper portion thereof after mounting or dismounting State the opening 21A of handle box 6, and there is in the front portion of housing 100 insert port 21B for inserting paper P.

Specifically, upper cover 22 is provided with the rotating shaft 22A of upper cover 22 at the rear, upside of apparatus main body 2, and with this rotating shaft 22A is Center rotates upward.Additionally, upper cover 22 is to cover from the rear end of apparatus main body 2 lid to front ends, by upwards Side rotates and is opened wide the upside of apparatus main body 2.

Protecgulum 23 is provided with the rotating shaft 23A of protecgulum 23 below the front side of apparatus main body 2, and centered by this rotating shaft 23A to Front rotates.Additionally, protecgulum 23 is to cover from the lower end of apparatus main body 2 lid to upper end, by forwards rotating The front side of apparatus main body 2 is opened wide.It should be noted that in FIG, double dot dash line the protecgulum 23 represented is by device master The state that the front side of body 2 is closed, solid line the protecgulum 23 represented is the state opened wide the front side of apparatus main body 2.

That is, the opening 21A on the top of housing 100 is by upper cover 22 opening and closing, and insert port 21B of front portion is opened by protecgulum 23 Close.About the structure of housing 100, will be described in more detail below.

Supply unit 3 has: be positioned at the bottom of apparatus main body 2, for placing the sheet feed stacker 31 of paper P；And by sheet feed stacker The paper-feeding mechanism 32 that paper P on 31 supplies to image forming part 4.

Sheet feed stacker 31 is by the paper placement plate of the example placing plate as sheet material being arranged in apparatus main body 2 bottom 220 and above-mentioned protecgulum 23 constitute.Specifically, protecgulum 23 constitutes a part for sheet feed stacker 31 when forward side is toppled over.This Outward, when each supply a piece of paper opens P, paper is placed plate 220 and is lifted to aftermentioned paper feed roller 210 by paper P.

Paper-feeding mechanism 32 mainly has paper feed roller 210, separate roller 32A and separating pad 32B.Paper feed roller 210 is than separate roller 32A more leans on the conveying direction upstream side of paper P to be arranged in the top that the rear end of plate 220 placed by paper.Separate roller 32A and separating pad 32B configures face to face.

Paper feed roller 210 and separate roller 32A form a component, as paper feed roller list 32C.Paper feed roller unit 32C is except supplying Outside paper bowl 210 and separate roller 32A, also there is idle pulley 32D.Idle pulley 32D with and the not shown tooth that rotates integrally of paper feed roller 210 Wheel is meshed, and with and the not shown gear that rotates integrally of separate roller 32A be meshed.So, paper feed roller 210 and separate roller 32A can rotate the most in linkage.

At this supply unit 3, after forming sheet feed stacker 31, this sheet feed stacker 31 loads paper making protecgulum 23 forward side topple over Open P.Contact, by paper feed roller 210, the paper P being placed in sheet feed stacker 31 and rotate, the paper in sheet feed stacker 31 being placed on P sends to separate roller 32A, and the paper P sent is separated one by one and supplies between separate roller 32A with separating pad 32B To image forming part 4.About the structure of supply unit 3, describe in detail below.

Image forming part 4 has: as the scanning element 5 of an example of exposure device；Handle box 6；And fixing dress Put 7.

Scanning element 5 is arranged on the front side in apparatus main body 2, have not shown laser emission section, polygon prism, lens and Reflecting mirror etc..In this scanning element 5, high-velocity scanning ground irradiating laser bundle on the surface of aftermentioned photosensitive drums 61.

Handle box 6 is positioned near the rear side central part of apparatus main body 2, is arranged on the top of paper-feeding mechanism 32.Handle box 6 can By opening 21A relative to housing 100 to the mounting or dismounting of front, upside, this handle box 6 has: photosensitive drums 61；By in photosensitive drums 61 Toner image is transferred to the transfer roll 62 on paper P；And not shown known charged device, developer roll, thickness margining tablet, Toner accommodating chamber etc..

In this place reason box 6 in, the surface of the photosensitive drums 61 of rotation after the most charged by charged device, by from The high-velocity scanning of the laser beam of scanning element 5 exposes.So, the current potential of the part being exposed declines, at the table of photosensitive drums 61 Electrostatic latent image based on view data is formed on face.

Then, the toner of toner receiving indoor is supplied to the electrostatic latent image of photosensitive drums 61, in photosensitive drums by developer roll Toner image is formed on the surface of 61.Then, by carrying paper P, photosensitive drums 61 between photosensitive drums 61 and transfer roll 62 The toner image that carried of surface be transferred on paper P.

Fixing device 7 is positioned at the rear, upside of apparatus main body 2, is arranged in the top of handle box 6, and fixing device 7 mainly has There are heating roller 71 and backer roll 72.

Heating roller 71 is the component heating paper P, is within it provided with the not shown thermals source such as Halogen light.

Backer roll 72 is to clamp paper P between itself and heating roller 71 and carry out the component carried, and backer roll 72 is arranged on The rear upside of heating roller 71.

In fixing device 7 as constructed as above, the toner being transferred on paper P passes through heating roller 71 at paper P and adds Heat is carried out fixing time between pressure roller 72.Carried out hot fixing paper P by fixing device 7 to be transported to be arranged in fixing device 7 The distributing roller 8 in downstream, be discharged to discharge tray 9 from this distributing roller 8.

Discharge tray 9 extends obliquely from the rear side forward side of apparatus main body 2, arranges as a part for upper cover 22. Additionally, in the front side of upper cover 22 and the leading section of discharge tray 9, be provided with prolongation dish 10.Prolongation dish 10 is in the front side end of discharge tray 9 Having center of rotation near portion, this prolongation dish 10 is arranged to move between following two positions: by double dot dash line table in Fig. 1 The position facing with discharge tray 9 shown；And by solid line represent from the position shown in double dot dash line to substantially 180 degree of fronts The position rotated.Prolongation dish 10 is arranged in the position of double dot dash line when being formed without image, plays as covering discharge tray 9 The function of lid.Additionally, prolongation dish 10 plays what holding was discharged by being arranged in position shown in solid when forming image The function of the leading section of paper P.

<detailed construction of housing>

It follows that the detailed construction of the housing 100 of constituent apparatus main body 2 is illustrated.

As in figure 2 it is shown, housing 100 has: as a pair side frame body 110 of an example of a pair framework；And bridge joint Component 120.

It is facing that a pair side frame body 110 clips image forming part 4 ground, the most facing.? The lower surface of each side frame body 110, in each of pair of right and left side frame body 110, is formed downwards in former and later two positions Prominent foot 111 (with reference to Fig. 4).

Return to Fig. 2,3, bridge member 120 is the flat component formed by metallic plate.Bridge member 120 is fixed on one Side frame body 110 is connected to each other with the bottom by a pair side frame body 110.More specifically, bridge member 120 is by a pair side frame body The part connection of the rear end portion side (end side) of 110.Specifically, the length ratio one of its fore-and-aft direction of bridge member 120 Little to the length in direction before and after side frame body 110, constitute the rear section (a part of) of the bottom surface of apparatus main body 2 (with reference to figure 4).Additionally, the rear end of bridge member 120 is positioned at side more forward than the rear end of side frame body 110, bridge member 120 Anterior end is positioned at before and after side frame body 110 near the central part in direction.

As shown in Fig. 6 (a), (b), bridge member 120 is provided with in the left side of bridge member 120 and to run through in the vertical direction Hole 120A, 120B, 120C.Hole 120A and hole 120B is arranged side-by-side in the rearward end of bridge member 120, and hole 120C is arranged in bridge joint The leading section of component 120.

Additionally, bridge member 120 be provided with on the right side of bridge member 120 run through in the vertical direction hole 120D, 120E, 120F.Hole 120D is arranged in the rearward end of bridge member 120, and hole 120F is arranged in the leading section of bridge member 120.Additionally, hole 120E is arranged side-by-side near hole 120F between hole 120D and hole 120F.

The hole that hole 120A and hole 120C is inserted through by not shown screw, two screws are respectively by hole 120A and hole 120C, by screwing togather with the not shown screwed hole being arranged on left side framework 110, fixes the left part of bridge member 120 In left side framework 110.Additionally, the hole that hole 120D and hole 120F is also inserted through by not shown screw, two screws pass through respectively Hole 120D and hole 120F, by screwing togather, by bridge member 120 with the not shown screwed hole being arranged on right side framework 110 Right part is fixed on right side framework 110.

Hole 120B and hole 120E is the hole of location, in the 120B of hole, is embedded with and is arranged on the not shown of left side framework 110 Boss, in the 120E of hole, is embedded with the not shown boss being arranged on right side framework 110.Additionally, hole 120B is with convex be inserted through Platform is substantially the same the circular hole that size is formed.Hole 120E is the elongated hole of the direction extension along the center towards hole 120B, by with slotting The boss worn is fitted together to, and prevents bridge member 120 from rotating centered by being embedded in the boss in the 120B of hole.

Bridge member 120 is provided with supporting part 121 in substantially central part and the left part of left and right directions, is used for supporting described later On propose the rotating shaft 241 of component 240.Supporting part 121 is formed by a part for bridge member 120 being cut.

As it is shown on figure 3, housing 100 also has above bridge member 120: keep framework 130；As guiding elements The rear skewed slot 140 of one example；And keep the scanning element of an example of component to keep component 150 as exposure device.

Keeping framework 130 is to be pivotably supported the component (in figure 3, eliminating paper feed roller 210) of paper feed roller 210.Protect Hold framework 130 and be positioned at the top of bridge member 120, be fixed on a pair side frame body 110, so that a pair side frame body 110 is connected.

Rear skewed slot 140 is integrally fixed at the component that a pair side frame body 110 is connected with the rearward end by a pair side frame body 110. Rear skewed slot 140 is arranged on the scope from the bottom of the rear end of a pair side frame body 110 to top.Rear skewed slot 140 is on the surface of inner side There is the guide surface 140A for being guided to image forming part 4 from the paper P that supply unit 3 supplies by paper feed roller 210.

Scanning element keeps component 150 to be to maintain the component of scanning element 5.Scanning element keeps component 150 by metallic plate Formed, can surface scanning constant unit 5 thereon.Scanning element keeps component 150 to be configured to make the front end of a pair side frame body 110 Side, portion (side, the other end) is connected.Specifically, scanning element keeps component 150 to place above the front portion of plate 220 at paper It is fixed on a pair side frame body 110.Specifically, scanning element keeps the anterior end of component 150 to be positioned at the front end than side frame body 110 Side the most rearward, portion, scanning element keeps the rearward end of component 150 to be positioned at before and after side frame body 110 near the central part in direction.

Scanning element keep component 150, be provided with run through in the vertical direction hole 150A, 150B, 150C, 150D, 150E、150F、150G、150H.Hole 150A and hole 150E is the hole of location, is respectively embedded into and is located at not scheming of scanning element 5 The boss shown.Hole 150A is arranged in and keeps the central authorities of component 150 near left side and rearward end than scanning element.Additionally, hole 150E is arranged in and keeps the central authorities of component 150 near right side and rearward end than scanning element.It addition, hole 150A is with slotting The circular hole that the size that the boss worn is substantially the same is formed.Hole 150E is the upwardly extending length in side at the center towards hole 150A Hole, by chimeric with the boss being inserted through, prevents scanning single 5 from rotating centered by inserting the boss in the 150A of hole.

It addition, keep, on front side of the central part of component 150, configuring porose 150B, 150C, 150D in scanning element.In hole In 150B, 150C, 150D, it is embedded with the not shown boss being arranged in scanning element 5.More specifically, this hole 150B, 150C, 150D are the holes slightly larger relative to the boss of scanning element 5, and the boss gap of scanning element 5 embeds.

The hole that the screw that hole 150F, 150G, 150H are not shown is inserted through.Before hole 150H is arranged in the hole 150A of location Near Fang, hole 150F is arranged in the front adjacent of the hole 150E of location.Additionally, hole 150G is arranged in keeps structure than scanning element The central part of part 150 is slightly by right side and leading section.And, by three screws respectively through hole 150F, 150G and hole 150H with The not shown screwed hole being arranged on scanning element 5 is screwed, and scanning element 5 is fixed to scanning element and keeps component 150.

<detailed construction of supply unit>

It follows that the detailed construction of the supply unit 3 as inventive feature part is illustrated.

As it is shown in figure 5, supply unit 3 includes: paper feed roller 210；Plate 220 placed by paper；A pair guiding elements 230 is (with reference to Fig. 1 And Fig. 3)；On carry component 240；Stretching spring S1 (with reference to Fig. 8 (c))；And drive mechanism 300 (with reference to Fig. 8 (a)).

Paper feed roller 210 at the rear end portion side of apparatus main body 2 by keeping framework 130 to be pivotably supported.This paper feed roller 210 leads to Cross and rotate from the 3rd gear 340 (with reference to Fig. 8 (a)) transmission driving force described later.

Plate 220 placed by paper is the tabular component placing paper P, for being placed on the upper surface as sheet material placed side Paper P on 221 lifts to paper feed roller 210.Specifically, after an example as an end of plate 220 placed by paper End 222 is arranged in above bridge member 120, is positioned at the rotating shaft near as the leading section 223 of an example of the other end 223A is rotatably supported by a pair side frame body 110 (apparatus main body 2).So, paper place plate 220 can in rearward end 222 Close to the approximated position (position represented by solid line) of paper feed roller 210 and rearward end 222 from the farthest separate location of paper feed roller 210 Move between (position represented by double dot dash line).

Paper is placed the leading section 223 of plate 220 and is positioned near the leading section of side frame body 110, and the rear end of plate 220 placed by paper Portion 222 is arranged near the rearward end of side frame body 110 (more specifically, position facing with paper feed roller 210).

This paper is placed plate 220 and is arranged to when rearward end 222 is in the state gone up most, i.e. when being located adjacent to position, leading section The edge 224 of 223 is overlapping with bridge member 120 when observing along the plate-like surface of bridge member 120.More specifically, paper is put The edge 224 of the leading section 223 putting plate 220 is arranged to the most overlapping with bridge member 120.

So, by only at the part configuration bridge member 120 of rear end portion side, can effectively utilize at apparatus main body 2 The space formed bottom Qian Ce.More specifically, when paper being placed plate 220 and being disposed in proximity to position, plate 220 placed by paper Leading section 223 edge 224 in decline state.By making this edge 224 enter institute's shape bottom the front side of apparatus main body 2 In the space become, can effectively utilize space, thus apparatus main body 2 miniaturization in the height direction can be made.

As shown in Figures 1 and 3, a pair guiding elements 230 is arranged on paper and places the left and right end portions of plate 220.A pair guiding Component 230 has guided plate 231 and rack pinion portion 232 (with reference to Fig. 4).

The two ends, left and right that guided plate 231 places plate 220 from paper extend upward, are formed as extending in the longitudinal direction Tabular.This guided plate 231 is by encountering on the width of the paper P on the upper surface 221 being placed on paper placement plate 220 Both ends, limit the position of the width of this paper P.

As shown in Figure 4, the omission of plate 220 is placed in rack pinion portion 232 from the bottom of guided plate 231 by being formed at paper The hole of reference, returns paper and places the lower surface 225 (with upper surface 221 opposition side) of plate 220, and in the lateral direction interior Side extends.Each rack pinion portion 232 is at the intermeshing gear teeth that is formed in part with, and places plate 220 with being arranged on paper Little gear 233 between two rack pinion portions 232 engages.

So, the consistent size with paper P make a guiding elements 230 be moved in the width direction time, another guide Component 230 is also moved in the width direction in linkage with this guiding elements 230.

And, this rack pinion portion 232 and little gear 233 are arranged in and bridge member 120 in the bottom surface of apparatus main body 2 The most nonoverlapping position (in other words, the most overlapping with bridge member 120 position).That is, bridge joint Component 120 is configured to rack pinion portion 232 and little gear 233 (a pair guiding elements 230) exposes in the bottom surface of apparatus main body 2. More specifically, as it is shown in figure 5, pass through only at the part configuration bridge member 120 of rear end portion side, and exist as described above Space is formed bottom the front side of apparatus main body 2, therefore, by configuring rack pinion portion 232 and little gear 233 within this space, Can effectively utilize space.

So, bridge member 120 and rack pinion portion 232 and little gear 233 are the most overlapping, therefore can make Apparatus main body 2 miniaturization in the vertical direction.

On carry component 240 and be arranged on paper and place the downside (with upper surface 221 opposition side) of rearward end 222 of plate 220.On Carry component 240 to be configured to carry on plate 220 being placed by paper and make paper place plate 220 and be located adjacent to the primary importance of position (position represented by solid line) and make paper place plate 220 to be located remotely from the second position (position represented by double dot dash line of position Put) between move.

Specifically, as shown in Fig. 6 (a) and (b), above carry component 240 and rotatably supported by bridge member 120.On carry structure Part 240 is mainly formed by metallic plate, and arranges the substantially central part of bridge member 120 from the left part of bridge member 120.

Carry component 240 on this and be provided with rotating shaft 241 in the position, two, left and right of leading section (the other end).Such as Fig. 6 (c) institute Showing, rotating shaft 241 has circular section.This rotating shaft 241 is rotatably supported by the supporting part 121 of bridge member 120.So, as Shown in Fig. 6 (a) and (b), above carrying component 240 can rotate in the way of rearward end up and down motion.

Additionally, rotating shaft 241 is by resin formation.So, rotating shaft 241 can be constituted at low cost.

Additionally, in the upper left part carrying component 240, the work abutted against with the second cam 322 of drive mechanism 300 described later It is wholely set with the rotating shaft 241 in portion 243 with left side.Service portion 243 is along above carrying the edge of left part of component 240 at fore-and-aft direction Upper extended, and be arranged in compared with paper placement plate 220 outside the width i.e. left and right directions of paper P.

In the rearward end of service portion 243, it is provided with side prominent upward and observes generally triangle shaped abutting part 244.This service portion 243 is by resin formation.And, in the front end of service portion 243, it is provided with upwardly extending arm 245, at arm The top in portion 245 is provided with hook portion 245A.

In the upper right part carrying component 240, it is provided with on two the portion 242 that carries with leaving about rearward end.On carry portion 242 and exist The main part 240A carrying component 240 under the state being positioned at the second position from above extends formation to oblique back upper place.On carry portion 242 be work as On carry component 240 and place the part that abuts against of lower surface 225 of plate 220 with paper when the second position moves to primary importance (with reference to Figure 10 (c)).

As shown in Fig. 8 (c), stretching spring S1 one end thereof coordinates in upper hook portion 245A carrying component 240, the other end Supported by gear supporting member 160 described later.And, stretching spring S1 is arranged to place plate 220 along paper and is located remotely from position Time paper place plate 220 upper surface 221 elongate in the longitudinal direction.

Hook portion 245A is forwards drawn by stretching spring S1.That is, stretching spring S1 on carry component 240 from the second position (Fig. 6 State shown in (a)) exert a force to primary importance (state shown in Fig. 6 (b)).

Drive mechanism 300 is to propose component 240 movement between the first position and the second position and confession on controlling The mechanism of the rotation of paper bowl 210.Specifically, drive mechanism 300 is configured to, when each supply a piece of paper opens P, make to carry Component 240 moves to primary importance from the second position, makes paper feed roller 210 rotate, and then, makes to carry component 240 to the second position Return.

Drive mechanism 300 is by the second gear 320 shown in the first gear 310 and Fig. 7 (c) shown in Fig. 7 (a), Fig. 8 (a) Shown driving gear the 330, the 3rd gear 340 and locking mechanism 350 are constituted.

Additionally, as shown in Fig. 8 (c), first gear the 310, second gear 320, drive gear 330 and the 3rd gear 340 by The gear supporting member 160 being arranged in apparatus main body 2 is pivotably supported.

As shown in Fig. 7 (a), (b), the first gear 310 has: driving gear part 311；Transmission gear part 312；First Cam 313；First spring supporting portion 314；And first braking parts 316.

Driving gear part 311 is circular gear, is additionally provided with gear teeth at its side face in addition to toothless portion) 311A.Should Driving gear part 311 rotates by engaging with driving gear 330 described later, (Fig. 8 when not carrying out paper supply action standby State shown in (a)～(c)), toothless portion) 311A is arranged in the position facing with driving gear 330.

Transmission gear part 312 is the gear of substantially semicircle shape, in the range of about 2/3rds of its periphery, is provided with Gear teeth.This transmission gear part 312 is configured to: make the 3rd gear 340 rotate by engaging rotation with the 3rd gear 340, When standby, gear teeth is not facing with the 3rd gear 340, carries after component 240 is positioned at primary importance, with the 3rd gear upper 340 is facing.Additionally, the gear teeth of transmission gear part 312 is arranged to make the 3rd gear 340 described later only rotate paper feed roller 210 pickup a piece of papers open the amount needed for P.

First cam 313 is formed as general cylindrical shape, has cooperation pawl 313A prominent diametrically at its side face.Coordinate Pawl 313A matches for top with lock arm 351 when standby, so that the rotation stopping of the first gear 310.

And, driving gear part 311, transmission gear part 312 and the first cam 313 are integrally formed, with on coaxial Rotate.Specifically, the first cam 313, driving gear part 311, transmission gear part 312 are arranged in the axial direction with said sequence Row, make the center being formed at the through hole 315 of the first gear 310 become center of rotation.

First spring supporting portion 314 be arranged on the first gear 310 with the first cam 313 opposition side.First spring supporting Portion 314 has the first supporting surface 314A extended diametrically from through hole 315 and from prominent for the first supporting surface 314A first Support projection 314B.

First braking parts 316 is the wall extended diametrically from through hole 315, and the position staggered in the circumferential is provided with two Individual.

Second gear 320 has: gear part 321；Second cam 322；Second spring supporting portion 323；And second braking Portion 325.

Gear part 321 is formed as substantially semicircle shape, has gear teeth at its side face.Specifically, in the week of gear part 321 Face, has the toothless portion) 321A identical with the toothless portion) 311A circumferential lengths of the driving gear part 311 of the first gear 310 and sets It is set to clip the gear teeth of this toothless portion) 321A.The form of gear tooth of this gear part 321 becomes the driving of phase place and the first gear 310 Gear teeth by gear part 311 is identical.This gear part 321 is configured to lacking of when standby toothless portion) 321A and the first gear 310 Teeth portion 311A is overlapping.

Second cam 322 is the cam rotated on the axle identical with the rotating shaft of gear part 321, in the axial direction, is arranged in The position that can abut against with the abutting part 244 above carrying component 240.The side face of the second cam 322 by first 322A, second 322B and recess 322C is constituted.

Specifically, first 322A is arranged on and can overcome stretching spring when relative with the abutting part 244 above carrying component 240 The active force of S1 makes to carry from component 240 is positioned at the second position, center of rotation from the second cam 322 positions away from.

Second 322B is face shorter from the distance of center of rotation compared with first 322A, when with on carry component 240 Abutting part 244 relatively time allow to carry component 240 by the active force of stretching spring S1 from the second position to primary importance Mobile.

Recess 322C is provided in the depression on first 322A.Additionally, recess 322C be formed as when with on carry component 240 Abutting part 244 relative to time abutting part 244 power that recess 322C (cam surface) is applied towards in the rotating of the second cam 322 The heart.

The second cam 322 constituted as described above be configured to when standby recess 322C with on carry the abutting of component 240 Portion 244 is relative.

And, gear part 321 and the second cam 322 are integrally formed, thus to be arranged on the axle portion 324 of the second gear 320 Rotate integrally for rotating shaft.

Second spring supporting portion 323 is arranged on the radially extending end face of gear part 321.Second spring supporting portion 323 have the second supporting surface 323A extended diametrically and from the second prominent for the second supporting surface 323A supporting projections 323B.

Second braking parts 325 is to prominent raised of circumference from the wall extended diametrically from axle portion 324.Second braking parts 325 positions staggered diametrically when the second gear 320 is installed to the first gear 310 arrange two, to clip first First braking parts 316 of gear 310.

The first gear 310 constituted as described above and the second gear 320 are by inserting the axle portion 324 of the second gear 320 Entering in the through hole 315 of the first gear 310 and carry out installing and becoming one group of component, axle portion 324 is rotatable by gear supporting member 160 Ground supports.Additionally, one in the first gear 310 and the second gear 320 can rotate relative to another.By the first gear First braking parts 316 of 310 and the second braking parts 325 of the second gear 320 match, and limit the first gear 310 and second In gear 320 one rotates relative to another.Additionally, when the first braking parts 316 and the second braking parts 325 coordinate, the The phase place of the gear teeth of the gear teeth of the driving gear part 311 of one gear 310 and the gear part 321 of the second gear 320 is identical.

Additionally, when the second gear 320 is assembled into the first gear 310, the top of the second supporting projections 323B and The top of the first supporting projections 314B is facing, and compression spring S2 is arranged in the first spring supporting portion 314 and the second spring supporting Between portion 323.

As shown in Fig. 8 (a), driving gear 330 is that driving source M (with reference to Fig. 1) input in being arranged on apparatus main body 2 is driven The gear that power rotates.This driving gear 330 is arranged on can be with the driving gear part 311 of the first gear 310 and the second tooth Wheel 320 is meshed, and the position that transmission gear part 312 with the first gear 310 is not meshed.

3rd gear 340 is the gear transmitting rotary driving force to paper feed roller 210.3rd gear 340 is arranged on can be with The transmission gear part 312 of the first gear 310 is meshed, and not with driving gear part 311 and second tooth of the first gear 310 The position that wheel 320 is meshed.

Locking mechanism 350 is configured to have: swingable lock arm 351；And the base end part of lock arm 351 is exerted a force Solenoid 352.Its top of lock arm 351 is arranged in the position that can abut against with the side face of the first cam 313 of the first gear 310 Put place.

It follows that the action to the supply unit 3 constituted as described above illustrates.

When standby shown in Fig. 8 (a)～(c), the recess 322C in first 322A of the second cam 322 with on carry structure The abutting part 244 of part 240 is relative.So, the second cam 322 overcomes the active force of stretching spring S1 to make to carry component 240 In second position.

Additionally, when this is standby, the second gear 320 by the recess 322C of the second cam 322 with above carry supporting of component 240 Meet portion 244 to match and stop the rotation.On the other hand, the first gear 310 by lock arm 351 with coordinate pawl 313A match and Making compression spring S2 be, stop the rotation in the position of contraction state.

When supplying paper P, the solenoid 352 state when standby is operated, as shown in Fig. 9 (a), locking Arm 351 departs from from the cooperation pawl 313A of the first gear 310.So, as shown in Fig. 9 (a)～(c), by the work of compression spring S2 Firmly, the first gear 310 is pressed by the counter clockwise direction in Fig. 9 (a), so that the driving gear part of the first gear 310 The gear teeth of 311 is meshed with the driving gear 330 of rotation.So, the first gear 310 by drive gear 330 drive and Rotate.

As shown in Figure 10 (a)～(c), rotated by the driving gear part 311 of the first gear 310, make the first gear 310 First braking parts 316 in direction of rotation downstream encounter the second braking parts 325 of the second relative gear 320, thus to Two gears 320 exert a force.So, the second gear 320 starts to rotate.Rotated by the second gear 320, make the second cam 322 with On carry the abutting part 244 of component 240 relative face become second 322B from first 322A.Therefore, above carry component 240 to pass through Stretch the active force of spring S1 and begin to ramp up to primary importance along second 322B of the second cam 322 from the second position.Logical Cross and carry component 240 and move to primary importance from the second position, above carry component 240 on carry portion 242 and from below paper placed Plate 220 upwards carries.So, the rearward end 222 of paper placement plate 220 starts to move to approximated position from separate location.

When the first gear 310 and the second gear 320 further rotate, as shown in Figure 11 (a)～(c), plate placed by paper 220 are located adjacent to position.Gear teeth and the 3rd gear 340 of the transmission gear part 312 of the first gear 310 are meshed.So, 3rd gear 340 starts to rotate, thus paper feed roller 210 also rotates with.Therefore, it is placed on paper and places the paper P on plate 220 Supplied by paper feed roller 210.

When for give a piece of paper open P time, release gear teeth and the 3rd tooth of the transmission gear part 312 of the first gear 310 The engagement of wheel 340, paper feed roller 210 stops.

When the first gear 310 and the second gear 320 further rotate, the second cam 322 with above carry supporting of component 240 Connect relative face, portion 244 and become first 322A from second 322B, on carry component 240 and execute to the second position from primary importance Power.So, paper placement plate 220 also moves to separate location from approximated position.

It follows that as shown in Fig. 8 (a), match with the cooperation pawl 313A of the first gear 310 in the top of lock arm 351, the The rotation of one gear 310 stops.Second gear 320 is by the recess 322C of the second cam 322 and the abutting part above carrying component 240 244 match and stop.That is, the moment rotation that the second cam 322 opens P at each supply a piece of paper is turned around, and makes to carry component 240 Move to primary importance from the second position, then, move to the second position.

According to the above, following beneficial effect can be obtained in the present embodiment.

Carry the component that component 240 is rotary type on paper is placed that plate 220 upwards carries, therefore, with spring etc. by paper Place plate 220 situation about upwards putting forward and compare, apparatus main body 2 miniaturization can be made.Additionally, by arranging on bridge member 120 On propose the rotating shaft 241 of component 240, the further miniaturization of apparatus main body 2 can be made.

Additionally, bridge member 120 is being provided with the rear end portion side of apparatus main body 2 of paper feed roller 210 by a pair side frame body 110 A part is connected to each other, and therefore, and bridge member 120 is arranged to the situation phase that the entirety of a pair side frame body 110 is connected Ratio, can suppress cost.Additionally, by arranging bridge member 120 being provided with paper feed roller 210 side, make the side frame of paper feed roller 210 side The intensity stabilization of body 110, so that being not easy crooked near paper feed roller 210, can improve paper supply precision.

Additionally, in the leading section of apparatus main body 2, scanning element keeps component 150 to be arranged to by a pair side frame body 110 even Connect, therefore, the intensity being not provided with bridge member 120 side of apparatus main body 2 is also ensured that.And, bridge member 120 He While scanning element keeps component 150 to use the least component, it can be ensured that the intensity of apparatus main body 2 entirety.

Additionally, at the rear end portion side of apparatus main body 2, rear skewed slot 140 is arranged to by the rearward end of a pair side frame body 110 even Connect, therefore, can further improve the intensity of the rear end portion side of apparatus main body 2.

Additionally, bridge member 120 is made up of metallic plate, therefore, with compared with the situation of resin formation, can be made to relatively Thin.So, apparatus main body 2 miniaturization can be made.

Although being explained above embodiments of the present invention, but the invention is not restricted to above-mentioned embodiment.For specifically Structure, can carry out suitable change without departing from the scope of the subject in the invention.

In the above-described embodiment, the bottom surface of bridge member 120 constituent apparatus main body 2 at least some of, but, this Bright being not limited to this, such as, bridge member 120 may make up the whole bottom surface of apparatus main body 2.

Additionally, in the above-described embodiment, bridge member 120 is by the rear end portion side (end side) of side frame body 110 A part is connected to each other, but, the invention is not restricted to this, such as, whole side frame body 110 can be connected by bridge member 120, it is possible to The part of side, leading section (side, the other end) is connected to each other.

Additionally, in the above-described embodiment, guiding elements 230 is configured to expose in the bottom surface of apparatus main body 2, but, this Invention is not limited to this, and guiding elements 230 can also not expose in the bottom surface of apparatus main body 2.

In the above-described embodiment, as an example of recording sheet, have employed the paper such as ground paper, postcard, thin paper P, but, the invention is not restricted to this, for example, it is also possible to be OHP sheet material.

Claims (8)

1. an image forming apparatus, including:

Image forming part, for forming image on recording sheet；

Apparatus main body, it has a pair with clipping described image forming part facing framework and connects the bridge of the pair of framework Connection member；

Paper feed roller；

Plate placed by sheet material, is used for placing described recording sheet, places joining face to face with described paper feed roller of plate with described sheet material The end put can be in the approximated position near described paper feed roller with farthest away between the separate location of described paper feed roller The mode of movement, is rotatably supported on described apparatus main body by the other end that plate placed by described sheet material, passes through One end is moved to described approximated position from described separate location, and the described record that plate will be placed placed by described sheet material Sheet material lifts to described paper feed roller；And

Carry component in tabular, be arranged in the opposition side that the recording sheet placed side of plate placed by described sheet material, it is possible to described in making Sheet material is placed the one end of plate and is positioned at the primary importance of described approximated position and makes described sheet material place described the one of plate Individual end is moved between the second position of described separate location,

Carry component on described and be rotatably supported on described bridge member,

Described bridge member is formed as tabular,

Along the surface observation of the tabular of described bridge member, when one end is positioned at described approximated position, described sheet material The edge of the side, place, described the other end placing plate is overlapping with described bridge member.

Image forming apparatus the most according to claim 1, it is characterised in that described bridge member constitutes described apparatus main body Bottom surface at least some of.

Image forming apparatus the most according to claim 2, it is characterised in that described bridge member will be located in described sheet material and puts A part for the pair of framework putting the side, place, one end of plate is connected to each other.

Image forming apparatus the most according to claim 3, it is characterised in that the described sheet material at described apparatus main body is placed The side, place, described the other end of plate, is provided with for keeping the exposure device of exposure device to keep component, and described exposure device is protected Hold component and connect the pair of framework.

5. according to the image forming apparatus according to any one of Claims 1 to 4, it is characterised in that

Described sheet material is placed plate and is included a pair guiding elements, and described guiding elements limits and is placed on described recording sheet placed side The position of the width of recording sheet,

Described bridge member is configured in the position exposed so that the pair of guiding elements in the bottom surface of described apparatus main body.

Image forming apparatus the most according to claim 3, it is characterised in that also include ways, described ways The recording sheet supplied by described paper feed roller is guided to described image forming part,

Described ways is configured to connect the side, place, one end of the pair of framework.

Image forming apparatus the most according to claim 1, it is characterised in that described bridge member is made up of metallic plate.

Image forming apparatus the most according to claim 1, it is characterised in that carry component on described and include being supported on described bridge The rotating shaft of connection member, described rotating shaft is formed from a resin, and has circular section.