CN1537799A

CN1537799A - Paper-feeding device of image forming equipment

Info

Publication number: CN1537799A
Application number: CNA2004100396772A
Authority: CN
Inventors: 张德焕
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2003-04-15
Filing date: 2004-03-16
Publication date: 2004-10-20
Anticipated expiration: 2024-03-16
Also published as: KR100513753B1; US20040207145A1; KR20040089939A; CN1307085C

Abstract

A paper-feeding apparatus of an image forming apparatus, having a driving motor, at least one first drive roller positioned downstream in a paper pickup direction of a pickup roller, at least one second drive roller disposed to press the sheet of paper with a predetermined pressure against the first drive roller, and a drive roller power transmitter transmitting a power of the driving motor to the first drive roller, to allow the pickup roller and the first and the second rollers to be respectively driven in the paper pickup direction and a paper feeding direction during the pickup of paper, and to transmit the power of the driving motor to the second drive roller, to allow only the first and the second rollers to be driven in the paper feeding direction during the line feeding of paper, and thus prevent paper feed troubles such as paper jamming and paper skewing.

Description

The paper feed of imaging device

Technical field

The present invention relates to paper feed such as the imaging device of duplicator, chopping machine and facsimile apparatus, the paper feed that relates to a kind of imaging device particularly, this paper feed is avoided for example paper supply difficulty of paperboard, paper deflection by the traction force of removing the generation of paper supply drive roller, and improves paper feed roller paper supply precision.

Background technology

Imaging device such as duplicator, chopping machine and facsimile apparatus is typically provided with the paper feed that page is supplied to image-generating unit.

As illustrated in fig. 1 and 2, this paper feed 10 comprises: carton 20 is used to stack page P; Frame 11 is used for Assembly ﹠Disassembly carton 20 thereon; Pickup unit 30, it be installed on the frame 11 with respect to carton 20 and one connect a ground and pick up page P; With paper supply unit 40, the page P that it is installed on the frame 11 and carries picked unit 30 to pick up with respect to carton 20.

Pickup unit 30 comprises: pick-up roller assembly 31, and it is supported on the frame 11 and rotates relative to bolster 35; With pick-up roller drive motor 33, it drives the pick-up roller assembly by power transmission gear group 37.

Pick-up roller assembly 31 is provided with: pick-up roller 34, it one connect a ground and pick up page P; The first unidirectional power forwarder (not shown), such as only pick-up roller 34 and and the pick-up roller gear (not shown) of pick-up roller 34 coaxial positioning between paper pick up direction, transmit the spring clutch of turning effort; With support 36, it has and is supported in an end that picks up roll shaft 34a and is fixed on the other end on the bolster 35, so that make pick-up roller 34 with set pressure contact page P by its weight.

As shown in Figure 2, paper supply unit 40 is provided with: driven roller 41 and assistive drive roller 42, the page P that they carry picked roller 344 to pick up; The donor rollers (not shown), the page P that it is carried driven roller 41 and assistive drive roller 42 supplies to the image-generating unit (not shown).

Driven roller 41 is connected with pick-up roller drive motor 33 by having such as the driven roller gear cluster (not shown) of the second unidirectional power forwarder of spring clutch, and driven roller 41 picks up along paper during paper picks up that direction is driven and idle running during paper is supplied with.

Below, the operation of the conventional paper feed 10 of said structure is described.

At first, the pick-up roller assembly 31 of pick-up roller 34 picked unit 30 rotates along clockwise direction, and pick-up roller 34 is connected to pick-up roller drive motor 33 by power transmission gear group 37.

So pick-up roller 34 contact and one connect a ground and pick up the page P that is stacked in the carton 20.At this moment, in page P, has only uppermost page P by the power of rotating be arranged on friction cover in the carton 20 or the friction force of baffle plate 39, to driving and 41,42 conveyings of assistive drive roller along pick-up roller 34 clockwise directions.

Afterwards, page P is connected to the driven roller 41 and the assistive drive roller 42 of pick-up roller drive motor 33 through the driven roller gear cluster, be transported to donor rollers and auxiliary donor rollers.

Then, during near page P starting is arranged on donor rollers paper sensor (not shown), through after the schedule time, promptly be supplied in the guide end of page P that roll gap between roller and the auxiliary donor rollers curls and on time, the controller (not shown) stops pick-up roller 34.Then, controller drives donor rollers drive motor (not shown) is to drive donor rollers.

At this moment, pick-up roller 34 and driven roller 41 are subjected to page P turning effort, the also second unidirectional power forwarder of first unidirectional power forwarder of picked roll assembly 31 and driven roller gear cluster idle running respectively along clockwise direction.

Afterwards, page P supplies to image-generating unit by donor rollers and is discharged from after this image-generating unit is printed.

But, in conventional paper feed 10, because pick-up roller assembly 31 and driven roller gear cluster have the first and second unidirectional power forwarders respectively, so pick up that the back donor rollers is supplied to that roll drive motor drives and when supplying with paper supply at page, donor rollers is vulnerable to and the pick-up roller 34 that dallies and driven roller are 41 cooresponding, resist the gravity of the traction force of second power drive device of the first unidirectional power forwarder of pick-up roller assembly 31 and driven roller gear cluster and pick-up roller assembly 31 respectively and act on driven roller on the page P and the pressure between the assistive drive roller 41,42.

This resistance that acts on the donor rollers not only reduces the paper supply precision of donor rollers, and also can cause page deflection or obstruction in the worst case.

In addition, in the paper feed 10 of routine, because gravity and similar power by pick-up roller assembly 31, it is opposite to act on the vector of the turning effort on the page P by pick-up roller 34 during acting on the vector of the power on the page P and picking up at paper, so problem that the rotation of pick-up roller 34 makes a concerted effort to reduce during existing page to pick up, therefore, the paper of pick-up roller 34 picks up decrease in efficiency.

If the paper of pick-up roller 34 picks up decrease in efficiency, trouble not picked such as page P or that page stops up then can take place.

Summary of the invention

One aspect of the present invention provides the paper feed of an imaging device, the structure of this paper feed can not produce resistance at paper feeding (line feeding of paper) drive roller, thereby can avoid, and the paper supply precision of the roller of improving supply such as paper supply defectives such as paper obstruction, paper deflections.

Another aspect of the present invention provides the paper feed of an imaging device, this paper feed has the vector of the power on the page that acted on by the pick-up roller assembly, this vector is worked by the equidirectional that pick-up roller acts on the vector of the turning effort on the page during pick up at paper, thereby can improve the efficient of pick-up roller.

Above-mentioned and/or others and advantage realize that by the paper feed of the imaging device that is provided this paper feed comprises: the pick-up roller assembly, and it has a pick-up roller that picks up page at least; At least one drive motor; At least one first driven roller, it is positioned at the downstream that paper picks up at least one pick-up roller on the direction; At least one second driven roller, it is set to first set pressure page is pressed at least one first driven roller; With the driven roller power drive device, it is sent at least one first driven roller with the power of at least one drive motor during paper picks up, so that pick up direction and the paper supply direction drives at least one pick-up roller, at least one first driven roller and at least one second driven roller respectively along paper, and it is sent at least one second driven roller with the power of at least one drive motor, so that have only at least one first driven roller and at least one second driven roller to be driven during the paper feeding.

According to an aspect of the present invention, this driven roller power drive device comprises: the wobble gear parts, and it interconnects with the donor rollers of the donor rollers gear of supplying with the roll shaft coaxial positioning and supply page; At least one first driven roller coaxial positioning on one first driven roller gear, it and first drive roller shaft; Or the second driven roller gear, it is according to the rotation direction of paper feed roller gear, locate coaxially with at least one second driven roller on second drive roller shaft.

According to an aspect of the present invention, this donor rollers gear is connected to the motor shaft of at least one drive motor by a plurality of gears.

According to an aspect of the present invention, this wobble gear comprises: the first empty wobble gear, and it meshes the first driven roller gear; The second empty wobble gear, it meshes the second driven roller gear; At least one wobble gear, its engagement donor rollers gear, and its location can optionally be connected with the first empty wobble gear or the second empty wobble gear according to the rotation direction of this donor rollers gear.According to an aspect of the present invention, wobble gear has the swing arm that pivotally is fixed on the frame, so that optionally be connected with the first empty wobble gear or the second empty wobble gear according to the rotation direction of supplying with roll shaft.

According to an aspect of the present invention, this driven roller power drive device also comprises: the unidirectional power transfer member, it is arranged on first drive roller shaft, by wobble gear and the first empty wobble gear power of at least one drive motor is sent to the first driven roller gear, during page picks up, the power of this drive motor is sent at least one second driven roller by at least one first driven roller, and pass through wobble gear, the second empty wobble gear, the second driven roller gear, the power that will not be sent at least one drive motor of at least one first driven roller with at least one second driven roller is sent to the pick-up roller assembly, so that during paper feeding, allow at least one first driven roller to dally in the paper supply direction.

According to an aspect of the present invention, this unidirectional power transfer member comprises: at least one spring clutch, it have the rotatable roll sleeve that is arranged at least one first driven roller on first drive roller shaft, be fixed on the lining axle sleeve of the lining on first drive roller shaft and twine this roll sleeve and the lining axle sleeve to produce the clutch spring of force of sliding friction between the two.

According to an aspect of the present invention, this pick-up roller assembly also comprises: be positioned at the driven wheel that picks up on first drive roller shaft, one first driven roller and this driven roller gear are set on it at least coaxially; The pick-up roller gear, it with pick up that at least one pick-up roller is provided with coaxially on the roll shaft; And at least one idle running picks up gear, is positioned at and picks up between driven wheel and the pick-up roller gear, is sent to the pick-up roller gear with the power with at least one drive motor from picking up driven wheel.According to an aspect of the present invention, act on the vector of the power on the page in order to ensure the pick-up roller assembly, along with act on the identical direction of the vector of the turning effort on the page by pick-up roller during page picks up and work, this first drive roller shaft is provided with like this, promptly with perpendicular to being positioned at the carton substrate of picking up the roll shaft center plane of stretching compare, the arranged downstream of direction is picked up on the plane of stretching perpendicular to the carton substrate that is positioned at the first drive roller shaft center towards the paper of pick-up roller.

According to an aspect of the present invention, this paper feed also comprises: pick-up roller assembly lifter, at least one pick-up roller that it makes the pick-up roller assembly and page contact also make pick-up roller separate from page according to the rotation direction of first drive roller shaft, so that at least one pick-up roller is contacted with page.

According to an aspect of the present invention, pick-up roller assembly lifter comprises first spring, and it is arranged on picks up on the roll shaft and have the end that is bearing in respectively on frame and the pick-up roller assembly.

According to an aspect of the present invention, pick-up roller assembly lifter stacks the carton of page relatively and is provided with by the pick-up roller assembly of carton operation, and makes at least one pick-up roller of pick-up roller assembly contact, at carton at least one pick-up roller be separated with page with page with set pressure when carton is installed in the frame.

According to an aspect of the present invention, pick-up roller assembly lifter comprises: promote guide groove portion, it is arranged on the top of carton sidewall; Lift shaft, it has and is positioned at its first end and is supported rotatably in protruding guide rail on the frame, and this protruding guide rail rises and descends along upgrading slot; Attaching parts, it is arranged between second end and pick-up roller assembly of lift shaft, in order to when lift shaft is rotated by protruding guide rail at least one pick-up roller immigration is contacted the lowering position of page and the position that immigration separates with page; Drawing part, it makes the pick-up roller assembly be offset along first direction, so that the pick-up roller of pick-up roller assembly returns to and remain on hoisting position.

According to an aspect of the present invention, this attaching parts comprises: first connecting rod, and it has first end of the lift shaft of being fixed on second end; And second connecting rod, it has first and second ends of second end that is rotationally supported in first connecting rod and pick-up roller assembly respectively.

According to an aspect of the present invention, this drawing part comprises extension spring, and it has first end that one of is fixed in pick-up roller assembly, first connecting rod and the second connecting rod and is fixed on second end of frame.

According to an aspect of the present invention, this paper feed also comprises the second driven roller releaser, is used for when for example page card gets lodged between at least one second driven roller and first driven roller, second driven roller is separated with first driven roller.

According to an aspect of the present invention, this second driven roller releaser comprises: trigger bar, and it has first end of the frame of being rotationally supported in and second end of this second drive roller shaft of rotating support; Recover parts, it makes trigger bar return to engage position after the stifled page of card is removed, and at this engage position, trigger bar is oppressed at least one second driven roller so that with set pressure and the engagement of at least one first driven roller.

According to an aspect of the present invention, these recovery parts can comprise spring, and it is set on the anchor shaft that is rotatably supported in the corresponding supporting of frame and has two ends that are supported in respectively on trigger bar and the frame.

Others of the present invention and/or advantage will be described in the lower part, and will partly can understand from this description, maybe can learn from enforcement of the present invention.

Description of drawings

Below, will make these and/or others of the present invention become clearer and be easier to the explanation of embodiment in conjunction with the accompanying drawings and understand, in the accompanying drawings:

Fig. 1 is the transparent view of the conventional paper feed of imaging device;

Fig. 2 is the lateral plan of the paper feed of Fig. 1;

Fig. 3 is the diagrammatic side view of the paper feed of imaging device of the present invention;

Fig. 4 is the partial top view of annexation between pick-up roller assembly, unidirectional power transfer member and the driven roller parts of expression paper feed shown in Figure 3;

Fig. 5 is the transparent view of improvement example of pick-up roller assembly lifter of the paper feed of expression second embodiment of the invention;

Fig. 6 A and 6B are the lateral plans of operation of the pick-up roller assembly lifter of expression paper feed shown in Figure 5.

The specific embodiment

Specify the embodiments of the invention shown in the accompanying drawing now, wherein, same numeral is represented components identical all the time.Below, embodiments of the invention are described in conjunction with the accompanying drawings.

Referring to Fig. 3, wherein show the paper feed 100 of imaging device of the present invention.

Paper feed 100 of the present invention comprises: carton 120 is used to stack page P; The frame (not shown) receives and removably installs carton 120; Pickup unit 130, its relative carton 120 is set on the frame and one page picks up page P with connecing one page; With paper supply unit 140, it is arranged on the frame, and supply with the page P that is picked up by pickup unit 130.

Leading end (that is, the left side of figure) at carton is provided with a plurality of friction covers 128, so that once pick up and supply with one page paper P during paper picks up.

This pickup unit 130 comprises: the first drive roller shaft 142a of pick-up roller assembly 131, its relative fixed driven roller parts 141 on frame is fixed rotationally, so that rotate explicitly with drive motor (hereinafter described 155); Pick-up roller assembly lifter 150, it is according to the rotation direction of the first drive roller shaft 142a, pick-up roller 134,134 ＇ that selectively make pick-up roller assembly 131 are with page P contact and separate from page P, so that pick-up roller 134,134 ＇ are contacted with page P.

This pick-up roller assembly 131 comprises: two are rotatably mounted to pick-up roller 134,134 ＇ that pick up on the roll shaft 134a, so that one page picks up page P with connecing one page; Pick up driven wheel 139, it is positioned on the first drive roller shaft 142a that is driven motor 155 drivings; Pick-up roller gear 135, it and pick-up roller 134, the 134 ＇ coaxial positioning of picking up on the roll shaft 134a; Gear 136,137,138 is picked up in first, second and the 3rd idle running, they be arranged on pick up between driven wheel 139 and the pick-up roller gear 135 and be separately fixed at first, second and the 3rd idle running

picker shaft

136a, 137a, 138a on so that the propulsive effort of drive motor 155 is sent to pick-up roller gear 135 from picking up driven wheel 139; Support 133, it receives gear 135,136,137,138,139, and supports

corresponding axle

134a, 136a, 137a, 138a, 142a.

According to an aspect of the present invention, vector in order to ensure the power of pick-up roller assembly 131 acts on the page P, it is the engagement force of its deadweight and the first driven roller gear 143 that below will illustrate, along with pick up at page P during act on the identical direction of the direction of turning effort of pick-up roller 134,134 ＇ and work, then the first drive roller shaft 142a is provided with like this, promptly compare, be positioned at the downstream (to the left side of picking up roll shaft 134a described in Fig. 3) that paper picks up the path on the plane of the first drive roller shaft 142a center vertical stretching with the vertical plane surface that picks up roll shaft 134a.

According to an aspect of the present invention, this pick-up roller assembly lifter 150 comprises: first spring, it is arranged on the first drive roller shaft 142a of the respective end on the second supporting convex 133a that is bearing on the support 133 that is positioned at the first supporting convex (not shown) on the frame and is positioned at pick-up roller assembly 131.

When the first driven roller gear 143 is activated the power of rotating along clockwise direction that propulsive effort caused of motor 155, first spring of pick-up roller assembly lifter 150 is turned to lowering position (solid line among Fig. 3) by the compression of the engagement force of the first driven roller gear 143 thereby center on the first drive roller shaft 142a.When the first driven roller gear is not activated along clockwise direction turning effort of motor, the stored energy of compressed first spring makes pick-up roller assembly 131 be subjected to another turning effort around the first drive roller shaft 142a, and makes pick-up roller assembly 131 return to hoisting position (dotted line among Fig. 3).At lowering position, pick-up roller 134 contacts with page P with first set pressure with 134 ＇, and in hoisting position, pick-up roller 134 separates with page P with 134 ＇.

Paper supply unit 140 comprises: driven roller parts 141, in order to carry the page P that picks up by pick-up roller assembly 131; Donor rollers parts 146 are in order to supply to the image-generating unit (not shown) with page P; Discharge roller member 165, in order to being discharged into the outside at the page P that image-generating unit is printed; Drive motor 155, in order to driving these driven roller parts 141, donor rollers parts 146 and to discharge roller member 165,

As shown in Figure 4, these driven roller parts 141 comprise: two first driven roller 142,142 ＇, they are supported rotatably in the first drive roller shaft 142a, the first drive roller shaft 142a rotational fixation on frame and the paper that is in pick-up roller 134,134 ＇ pick up the downstream of direction; Two second driven roller 144,144 ＇, they are fixed on the second drive roller shaft 144a, so that make page P press first driven roller, 142,142 ＇ with second set pressure.

End at corresponding first and second

drive roller shaft

142a and 144a, respectively with the wobble gear parts 162 or 163 ingears, first driven roller gear 143 and the second driven roller gear 145 (only shown in Figure 3) that form driven roller power drive device 160, respectively with first and second driven rollers, 142,142 ＇, 144,144 ＇ coaxial positioning.

These donor rollers parts 146 comprise: paper feed roller gear 148, and it is positioned at supplies with on the roll shaft 147a, so that along with first and second power transmission gears 156 of the motor shaft 155a that is connected to drive motor 155 and 157 and rotate; Donor rollers 147, it is located coaxially with the donor rollers gear of supplying with on the roll shaft 147a 148; Friction roller 149, it is arranged on the friction roll shaft 149a rotationally, with the 3rd set pressure make page P press donor rollers 147, to transmit page P.

This friction roller 149 comprises friction roller pole 158, and pole 158 is by rack support, so that the set pressure of spring (not shown) is applied on the friction roller 149.

Driven roller power drive device 160; 170,170 ＇ are set between driven roller parts 141 and the donor rollers parts 146, in order to the propulsive effort of drive motor 155 is sent to first driven roller 143 of driven roller parts 141 from the donor rollers gear 148 of donor rollers parts 146.This can pick up direction and last pick-up roller 134,134 ＇ of driving of the paper direction of the supply (solid arrow among Fig. 3) and first, second driven roller 142,142 ＇ at paper respectively during paper picks up; 144,144 ＇ are sent to second driven roller 145 of driven roller parts 141 with the propulsive effort of drive motor 155 from the donor rollers gear 148 of donor rollers parts 146, so that only allow first, second driven roller 142,142 ＇ during the paper feeding; 144,144 ＇ are driven on the direction of the supply (dotted arrow among Fig. 3).

This driven roller power drive device 160; 170,170 ＇ comprise: wobble gear parts 160, and it is arranged in the middle of the first and second driven roller gears 143 and 145 of driven roller parts 141; Donor rollers gear 148, it is connected with drive motor 155a with 157 through first and second power transmission gears 156, to transmit page P; And according to the rotation direction of supply gear 148, and between the donor rollers gear 148 and the first driven roller gear 143 or interconnection between the donor rollers gear 148 and the second driven roller gear 145.

According to an aspect of the present invention, these wobble gear parts 160 comprise: the first and second empty wobble gears 162 and 163, and they mesh with the first and second driven roller gears 143 and 145 respectively; Wobble gear 161,148 engagements of it and paper feed roller gear and with the donor rollers 147 coaxial settings of supplying with roll shaft 147a, and selectively be connected with 163 with the first and second empty wobble gears 162 according to the rotation direction of donor rollers gear 148.

The axle 161a of wobble gear 161 is arranged on an end (not shown) of swing arm rotationally, the other end of this swing arm is hinged on the frame, so wobble gear 161 can selectively be connected with 163 with the first and second empty wobble gears 162 according to the rotation direction of donor rollers gear 148.

More specifically, shown in solid arrow among Fig. 3, when donor rollers gear 148 rotates when picking up page P in the counterclockwise direction, wobble gear 161 is by the swing arm and first empty wobble gear 162 engagements, and shown in the dotted arrow among Fig. 3, when donor rollers gear 148 rotates when giving page along clockwise direction, wobble gear 161 meshes by the swing arm and the second empty wobble gear 163.

In order to be sent to the propulsive effort of the drive motor 155 of the first driven roller gear 143 through wobble gear 161 and the first empty wobble gear 162, during picking up, paper is sent to second driven roller 144 and 144 ＇ by first driven roller 142 and 142 ＇, and will be through wobble gear 161, the second empty wobble gear 163, the second driven roller gear 145, be sent to the propulsive effort of the drive motor 155 of first driven roller 142 and 142 ＇ with second driven roller 144 and 144 ＇, what be sent to pick-up roller assembly 131 picks up driven wheel 139, thereby during the paper feeding along the paper direction of the supply dally first driven roller 142 and 142 ＇, as shown in Figure 4, so, driven roller power drive device 160; 170,170 ＇ also comprise: unidirectional power transfer member 170,170 ＇, they are arranged on the first drive roller shaft 142a.

According to an aspect of the present invention, this unidirectional power transfer member 170,170 ＇ comprise: two spring clutch 170,170 ＇, and they have rotatable each first driven roller 142 on the first drive roller shaft 142a and 171,171 ＇ of roll sleeve separately of 142 ＇ of being arranged on; Be fixed on lining axle sleeve 173a, the 173a ＇ of each lining 173,173 ＇ on the first drive roller shaft 142a; Clutch spring 175,175 ＇, they twine each roll sleeve 171,171 ＇ and each lining

axle sleeve

173a, 173a ＇, so that produce force of sliding friction between axle sleeve.

The wobble gear 161 and the first empty wobble gear 162 when wobble gear parts 160, when making the first driven roller gear 143 that is fixed on the first drive roller shaft 142a for example clockwise direction rotating along a direction, clutch spring 175,175 ＇ of spring clutch 170,170 ＇ twine on its coiling direction.So, the corresponding interior diameter of the excircle closed contact of clutch spring 175,175 ＇ and roller and roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇ and clutch spring 175,175 ＇ becomes less because of the force of sliding friction of roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇, thereby the turning effort of lining 173,173 ＇ is sent to roll sleeve 171,171 ＇ near first driven roller, 142,142 ＇ of lining

axle sleeve

173a, 173a ＇.Therefore, the turning effort of the first driven roller gear 143 is sent to second driven roller 144 and 144 ＇ through first driven roller, 142,142 ＇.

On the contrary, wobble gear 161 and the second empty wobble gear 163, the second driven roller gear 145 and second driven roller 144 and 144 ＇ when wobble gear parts 160, when first driven roller, 142,142 ＇ were rotated along clockwise direction, clutch spring 175,175 ＇ of spring clutch 170,170 ＇ untied winding on its contrary coiling direction.So, clutch spring 175,175 ＇ separate with the circumference of roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇, simultaneously, the interior diameter of clutch spring 175,175 ＇ increases because of the force of sliding friction of roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇, thereby makes first driven roller, 142,142 ＇ idle running.What therefore, the turning effort of first driven roller, 142,142 ＇ was not sent to pick-up roller assembly 131 picks up driven wheel 139.

Here, should be noted that described in the present invention and unidirectional power transfer member that illustrate is made of spring clutch 170,170 ＇, but the invention is not restricted to this embodiment.For example, this unidirectional power transfer member can comprise the unidirectional power conveyer as ratchet device.

Discharging roller member 165 comprises: discharge roller 166, it is connected with drive motor 155 by discharging roller gear group (not shown), to be released in the page P of image-generating unit printing; The auxiliary roller 167 that discharges discharges roller 166 with the compressing of the 4th set pressure.

In addition, according to an aspect of the present invention, paper feed 100 also comprises the second driven roller releaser 180, is used for when page P card is stifled second driven roller, 144,144 ＇ being separated from first driven roller, 142,142 ＇.

This second driven roller releaser 180 comprises: trigger bar 181, and it has the second end 181b that also can be moved by the first end 181a, the rotatably support second drive roller shaft 144a of rotatable support on frame between releasing position (dotted line among Fig. 3) and engage position (solid line among Fig. 3); And recover parts 183, after removing paperboard, it makes trigger bar 181 return to engage position.In the releasing position, trigger bar 181 makes second driven roller, 144,144 ＇ move and leave first driven roller, 142,142 ＇, at engage position, trigger bar 181 moves with second set pressure and first driven roller, 142,142 ＇ engagement second driven roller, 144,144 ＇.

Recover parts 183 and comprise second spring, this second spring is arranged on by rotatable support on the anchor shaft 184 on the corresponding supporting (not shown) of frame and have a end on the second fixed lobe (not shown) of first fixed lobe 185 that is supported in trigger bar 181 respectively and frame.

Second spring that recovers parts 183 has the elastic force that can second driven roller, 144,144 ＇ be pressed against first driven roller, 142,142 ＇ with second set pressure.

Below, will describe the operation of the paper feed 100 of imaging device of the present invention in conjunction with Fig. 3 and 4 in detail.

At first, after being installed to carton 120 in the frame, when imaging device of the present invention begins to operate according to print command, drive motor 155 along a direction for example clockwise direction (solid arrow among Fig. 3) rotate to pick up page P, so the donor rollers gear 148 that is connected to the axle 155a of drive motor 155 through first and second power transmission gears 156 and 157 rotates in the counterclockwise direction.

When donor rollers gear 148 rotated in the counterclockwise direction, wobble gear 161 was swung by swing arm and is meshed with the first empty wobble gear 162, and the first driven roller gear 143 meshes with the first empty pendulum gear 162 that rotates along clockwise direction.

When the first driven roller gear 143 rotates along clockwise direction, with first driven roller, 142,142 ＇ of the first driven roller gear, 143 coaxial positioning on the first drive roller shaft 142a, also the spring clutch by the unidirectional power transfer member rotates along clockwise direction at 170,170 ＇.

At this moment, because spring clutch is 170, the lining axle sleeve 173a of 170 ＇, 173a ＇ is along clutch spring 175, the winding direction of 175 ＇ rotates, so clutch spring 175,175 ＇ and roll sleeve and lining axle sleeve 171,171 ＇ and 173a, the excircle contact of 173a ＇, and roll sleeve and lining axle sleeve 171,171 ＇ and 173a, the force of sliding friction of 173a ＇ makes its internal diameter become less, so, lining axle sleeve 173a, the turning effort of 173a ＇ is transferred near lining axle sleeve 173a, first driven roller 142 of 173a ＇, the roll sleeve 171 of 142 ＇, 171 ＇.

Therefore, rotate in the counterclockwise direction with contacted second driven roller of first driven roller, 142,142 ＇ 144,144 ＇ that rotate along clockwise direction as above-mentioned usefulness second set pressure with set pressure.

In addition, when the first driven roller gear 143 rotates along clockwise direction, pick-up roller assembly 131 is from pick-up roller 134 and the hoisting position (dotted line Fig. 3) that 134 ＇ separate with page P, moves to the lowering position (solid line among Fig. 3) that pick-up roller 134 and 134 ＇ contact with page P with first set pressure.From the hoisting position to the lowering position, pick-up roller assembly 131 is with first spring of the engagement force pushing pick-up roller assembly 131 of the weight of pick-up roller assembly 131 and the first driven roller gear 143, simultaneously, with the first drive roller shaft 142a on the driven wheel 139 that picks up of the first driven roller gear, 143 coaxial positioning rotate along clockwise direction.

Therefore, by first, second and the 3rd idler gear 136,137 and 138 and pick-up roller 134 and 134 ＇, and rotate first, second and the 3rd idler gear 136,137 and 138 and pick-up roller 134 and 134 ＇ and pick-up roller gear 135 coaxial positioning of picking up on the roll shaft 134a along clockwise direction with picking up driven wheel 139 bonded assembly pick-up roller gears 135.As a result, pick-up roller 134 contacts and picks up the page P that overlays in the carton 120 with 134 ＇.

At this moment, in page P, have only uppermost page P, the turning effort of picked roller 134 and 134 ＇ and the friction drag that is arranged on the friction cover 128 in the carton 120 are sent to first and second driven rollers, 142,142 ＇ and 144,144 ＇.

In addition, this moment because pick-up roller assembly 131 acts on vectorial force on the page P, be the engagement force of himself weight and the first driven roller gear 143, work along the equidirectional that acts on the vector of the turning effort on the page P with pick-up roller 134 and 134 ＇, so the efficient of picking up of pick-up roller 134 and 134 ＇ improves.

Since first and second driven rollers, 142,142 ＇ and 144,144 ＇ along the equidirectional that picks up direction with paper rotate, promptly respectively along cw and anticlockwise motion, move towards paper feed roller 147 and friction roller 149 so be sent to the page P of first and second driven rollers, 142,142 ＇ and 144,144 ＇, and be not subjected to any traction force.

When page P almost arrives donor rollers 147 and starting and is arranged near the donor rollers 147 paper sensor (not shown), through after the schedule time, promptly the leading end of page P be supplied to roll gap between roller 147 and the friction roller 149 crooked and aim at after, the controller (not shown) stops the rotation of pick-up

roller

134 and 134 ＇.Then, controller along other direction, promptly drive this drive motor 155 (dotted arrow among Fig. 3) in the counterclockwise direction, to drive donor rollers 147 and to discharge roller 166.

When drive motor 155 rotates in the counterclockwise direction, be connected to the donor rollers gear 148 of the axle 155a of drive motor 155 through first and second transmission gears 156 and 157, rotate along clockwise direction, friction roller 149 rotates in the counterclockwise direction, for to page P.

When donor rollers gear 148 rotated along clockwise direction, wobble gear 161 was swung by swing arm and is meshed with the second empty pendulum gear 163.So, rotate in the counterclockwise direction with the second empty wobble gear 163 bonded assemblys second driven roller gear 145.

When the second driven roller gear 145 rotates in the counterclockwise direction, also rotate in the counterclockwise direction with second driven roller, 144,144 ＇ of the second driven roller gear, 145 coaxial positioning on the second drive roller shaft 144a, so first driven roller, 142,142 ＇ that contact second driven roller, 144,144 ＇ with set pressure rotate along clockwise direction.

At this moment, owing to first driven roller, 142,142 ＇ rotate along clockwise direction, so roll sleeve 171,171 ＇ of spring clutch 170,170 ＇ rotate along the uncoiling direction of clutch spring 175,175 ＇.Therefore, clutch spring 175,175 ＇ separate from the excircle of roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇ and roller, simultaneously the interior diameter of clutch spring 175,175 ＇ increases because of roll sleeve 171,171 ＇ and

lining axle sleeve

173a, 173a ＇ force of sliding friction, thereby makes first driven roller, 142,142 ＇ idle running.

When first driven roller, 142,142 ＇ dallied, what the propulsive effort of drive motor 155 was not sent to pick-up roller assembly 131 picked up driven wheel 139, and the spring of pick-up roller assembly 131 picked roll assembly lifters 150 moves to hoisting position (dotted line of Fig. 3) once more.

Therefore, be moved to image-generating unit under the situation of the interruption that traction force caused that by donor rollers 147 and friction roller 148 paper supplies the time, page P is not subjected to any interruption, for example caused by first and second driven rollers, 142,142 ＇, 144,144 ＇.As a result, improved the paper supply precision of paper feed roller 147 and avoided the deflection of paper or card stifled.

After this, page P is printed at image-generating unit, and subsequently by discharging roller 146 and auxiliary release roller 167 discharges, discharges roller 146 and be connected with drive motor 155 through release roller gear group with the auxiliary roller 167 that discharges.

Referring to Fig. 5-6B, improved pick-up roller assembly lifter 150 ＇ of the paper feed 100 of second embodiment of the invention are described.

Relative pick-up roller assembly 131 of pick-up roller assembly lifter 150 ＇ and carton 120 and be provided with.

When carton 120 was installed in the frame, pick-up roller assembly lifter 150 ＇ made pick-up roller 134,134 ＇ of pick-up roller assembly 131 with the 5th set pressure contact page P.When carton 120 when frame is dismantled, pick-up roller assembly lifter 150 ＇ also separate pick-up roller 134,134 ＇ with page P.

Pick-up roller assembly lifter 150 ＇ comprise: promote guide groove portion 125, it is positioned at the top of the sidewall 123 of carton 120; Lift shaft 151 has the guide rail 153 of protrusion and is supported rotatably on the frame so that be raised guide groove portion 125 at its first end and raises and reduce; Link member 154, it is arranged between the support 133 of second end of lift shaft 151 and pick-up roller assembly 131 so that when lift shaft 151 is rotated by protruding guide rail 153, make pick-up roller 134,134 ＇ move to the lowering position (Fig. 6 B) and the hoisting position of separating with page P (Fig. 6 A) of contact page P; Drawing part 152, it is tractive pick-up roller assembly 131 in the upward direction, makes pick-up roller 134, the 134 ＇ recovery of pick-up roller assembly 131 and remains on hoisting position.

The lifting guide groove 125 of carton 120 and the protruding guide rail 153 of lift shaft 151 are respectively equipped with lock slots 125a and locking projections 153a, and when carton was installed in the frame fully, lock slots 125a and locking projections 153a were meshing with each other.

For the ease of rotating pick-up roller assembly 131 around the first drive roller shaft 142a, link member 154 has: first connecting rod 154a, and it has first end of the lift shaft of being fixed on 151 second ends; Second connecting rod 154b, it has first end and second end on the support 133 of first end that is supported rotatably in first connecting rod 154a respectively and picking up assembly 131.

According to an aspect of the present invention, drawing part 152 comprises extension spring, and this spring has an end on the 3rd fixed lobe 133b of the support 133 that is fixed on pick-up roller assembly 131 and is fixed on another end on the 4th fixed lobe (not shown) that is positioned at frame.According to a further aspect in the invention, the extension spring of drawing part 152 is fixedly installed between the second connecting rod 154b and frame of link member 154.

Below, the operation of above-mentioned improved pick-up roller assembly lifter 150 ＇ is described.

As shown in Figure 6A, suppose that carton 120 is not installed in the frame, the carton 120 that wherein stacks page P moves at first in the direction of arrow A to be installed in the frame.

At this moment, when protruding guide rail 153 edge lifting guide groove portion 25 were directed and promote, lift shaft 151 was rotated along clockwise direction.

So, be connected to the first connecting rod 154a of lift shaft 151, rotate and tractive second connecting rod 154b downwards around lift shaft 151 along clockwise direction, therefore, compress the extension spring of drawing part 152 downwards with the support 133 of second connecting rod 154b pivotally attached pick-up roller assembly 131.

As mentioned above, when carton 120 was installed in the frame fully, the locking projections 153a of protruding guide rail 153 was inserted into the lock slots 125a that promotes guide groove portion 125, and pick-up roller 134,134 ＇ are positioned in lowering position and contact page P, shown in Fig. 6 B.

Below, the operation of dismounting carton 120 is described.

At first, carton 120 is moved so that carton is dismantled from frame, shown in Fig. 6 B along the arrow B direction.

At this moment, when promote guide groove portion 125 with carton 120 from the frame At time of eject, the protruding guide rail 153 that forces lift shaft 151 to be rotated along clockwise direction is released from lifting guide groove portion 125.

As a result, by the pulling force of the extension spring of drawing part 152, the support 133 of pick-up roller assembly 131 and second connecting rod 154b are pulled and upwards rise, and lift shaft 151 is rotated in the counterclockwise direction.

When the support 133 of pick-up roller assembly 131 rose, pick-up roller 134,134 ＇ moved to hoisting position and separate with page P, as shown in Figure 6A.

As seen from the above description, the paper feed 10 of the imaging device of the embodiment of the invention, can avoid during the paper feeding, because of eliminating the paper supply precision that first and second driven

rollers

142 and 144 traction forces that produced cause such as the paper supply faults such as paperboard and paper deflection and the roller 147 of improving supply.

In addition, by guiding pick-up roller assembly 131 vectors of the power on the page P that act on, just make the own wt of pick-up roller assembly 131 and pick up the engagement force of driven wheel 139 or the power of the protruding guide rail 153 of pick-up roller assembly lifter 150 ＇, with pick up at paper during the turning effort direction that acts on the page P by pick-up roller 134,134 ＇ identical, then paper feed 10 can improve the efficient of picking up of pick-up roller 134,134 ＇.

Though several embodiments of the present invention only have been described, but obviously, those skilled in the art can make change to these embodiment under the prerequisite that does not break away from the principle of the invention and design, scope of the present invention is limited in claims and their equivalent.

Claims

1. the paper feed of an imaging device, this imaging device has first and second drive roller shaft and carton, and this paper feed comprises:

One first driven roller, it is arranged on this first drive roller shaft rotationally;

One pick-up roller assembly, its first end are arranged on this first drive roller shaft rotationally;

One pick-up roller, it is arranged on second end of this pick-up roller assembly rotationally so that optionally move page in the carton along first direction, and this pick-up roller is provided with along relative this first driven roller of second direction opposite with first direction;

One second driven roller, it is arranged on this second drive roller shaft rotationally, so that with first set pressure page is pressed against this first driven roller;

One driven roller power drive device, it is sent to propulsive effort first and second driven rollers and pick-up roller, in paper feeding pattern propulsive effort only is sent to first and second driven rollers in the paper pickup mode.

2. paper feed as claimed in claim 1, wherein this paper feed also comprises: rotating donor rollers parts, it is sent to this driven roller power drive device with propulsive effort; With a drive motor, it is sent to this donor rollers parts with propulsive effort.

3. paper feed as claimed in claim 2, wherein these donor rollers parts comprise: a donor rollers and a donor rollers gear, it and this donor rollers coaxial positioning; Also comprise at least one power transmission gear with this paper feed, this power transmission gear will be sent to this donor rollers gear from the propulsive effort of motor.

4. paper feed as claimed in claim 2, wherein this driven roller power drive device comprises: wobble gear parts, it according to the rotation direction of these donor rollers parts, will be sent to one of this first driven roller and second driven roller from the propulsive effort of these donor rollers parts, wherein these donor rollers parts in the paper pickup mode along first rotation direction rotate, in paper feeding pattern along rotating with second rotation direction of this first direction of rotation.

5. paper feed as claimed in claim 4, wherein this paper feed also comprises one first driven roller gear, it and this first driven roller coaxial positioning and one second driven roller gear, it and this second driven roller coaxial positioning; Comprise one first empty wobble gear with these wobble gear parts, it meshes this first driven roller gear; One second empty wobble gear, it meshes this second driven roller gear; At least one wobble gear meshes these donor rollers parts and optionally meshes one of this first and second empty wobble gear according to the rotation direction of these donor rollers parts.

6. paper feed as claimed in claim 5, wherein these wobble gear parts also comprise: at least one puts gear wheel shaft, and at least one pendulum gear is set on it rotationally; With a swing arm, its first end is pivotally connected at least one wobble gear axle, its second end is hinged on the frame movably, thereby makes this wobble gear optionally mesh a gear in this first and second empty wobble gear according to the rotation direction of these donor rollers parts.

7. paper feed as claimed in claim 5, wherein in this paper pickup mode, this first empty wobble gear engagement also is sent to this first driven roller gear with propulsive effort and this first driven roller is sent to this second driven roller with propulsive effort; With in this paper feeding pattern, this second empty wobble gear engagement also is sent to this first driven roller gear with propulsive effort and this second driven roller is sent to this first driven roller with propulsive effort.

8. paper feed as claimed in claim 7, wherein this driven roller power drive device comprises: a unidirectional power transfer member, it and this first driven roller coaxial positioning, in the paper pickup mode, by this first driven roller propulsive effort is sent to this second driven roller, with in paper feeding pattern, propulsive effort is not sent to this pick-up roller assembly, to allow this first driven roller idle running.

9. paper feed as claimed in claim 8, wherein this unidirectional power transfer member comprises: a spring clutch, it comprises the roll sleeve of this first driven roller, one lining, it and this first driven roller coaxial positioning, and has a lining axle sleeve, with a clutch spring, it twines to produce force of sliding friction between two axle sleeves around this roll sleeve and lining axle sleeve, wherein, in the paper pickup mode, this first driven roller gear is sent to this pick-up roller assembly and lining through first drive roller shaft with propulsive effort, rotate along its coiling direction with this clutch spring, and mesh this roller lining, thereby propulsive effort is sent to this first driven roller, with in paper feeding pattern, this second driven roller is sent to first driven roller with propulsive effort, thereby rotates this roller lining, and make this clutch spring along the opposite direction uncoiling of its coiling direction, therefore propulsive effort is not sent to lining, first drive roller shaft, with in the pick-up roller assembly any one.

10. paper feed as claimed in claim 8, wherein this unidirectional power transfer member comprises a ratchet device.

11. paper feed as claimed in claim 1, wherein this pick-up roller assembly comprises: one picks up driven wheel, and it is arranged on this first drive roller shaft; Pick up gear with at least one idle running, it be arranged on this pick up between driven wheel and the pick-up roller, being sent to this pick-up roller from this propulsive effort that picks up driven wheel.

12. paper feed as claim 11, wherein this pick-up roller assembly also comprises the pick-up roller gear with this pick-up roller coaxial positioning, wherein, this at least one idle running is picked up gear and is arranged on this and picks up between driven wheel and this pick-up roller gear, and will be sent to this pick-up roller gear from this propulsive effort that picks up driven wheel.

13. paper feed as claimed in claim 1 also comprises the second driven roller releaser, is used for this second driven roller is separated from first driven roller.

14. as the paper feed of claim 13, wherein this second driven roller releaser comprises: a trigger bar, its first end are arranged on the frame rotationally, its this second drive roller shaft of second end rotatably support; With recovery parts, it setovers this trigger bar so that this second driven roller contacts this first driven roller with set pressure.

15. as the paper feed of claim 14, wherein this trigger bar comprises a fixed lobe; Comprise a spring with these recovery parts, this spring has the end that is bearing in respectively on this fixed lobe and the frame.

16. paper feed as claimed in claim 1 also comprises: a pick-up roller assembly lifter, it selectively makes this pick-up roller separate from page.

17. as the paper feed of claim 16, wherein in the paper pickup mode, this pick-up roller assembly contacts this page.

18. as the paper feed of claim 17, wherein this pick-up roller assembly comprises a supporting convex; Comprise a spring with this pick-up roller assembly lifter, this spring is arranged on this first driven roller, along setover this pick-up roller assembly and have the end that is supported in respectively on frame and this supporting convex of first rotation direction.

19. as the paper feed of claim 17, wherein with carton when frame is dismantled, this pick-up roller assembly lifter separates pick-up roller from page; When carton was inserted frame, this pick-up roller assembly lifter made pick-up roller contact with page.

20. as the paper feed of claim 19, wherein this pick-up roller assembly lifter comprises: one promotes guide groove portion, and it is positioned at the top of carton sidewall; One lift shaft, it is rotatably supported on the frame, and comprises that the protruding guide rail that is led by this lifting guide groove that is positioned at its first end is so that rotate this lift shaft; One link member, it is arranged between second end and this pick-up roller assembly of this lift shaft, is used for when this lift shaft is rotated by protruding guide rail, moves this pick-up roller at the lowering position of contact page with between the hoisting position of page separation; With a drawing part, be used for this pick-up roller assembly being setovered to this hoisting position along first rotation direction.

21. as the paper feed of claim 20, wherein this link member comprises: a first connecting rod, it has first end that is fixed on this lift shaft second end; With a second connecting rod, it has first and second ends on second end that is supported rotatably in respectively on this first connecting rod and this pick-up roller assembly.

22. as the paper feed of claim 20, wherein this drawing part comprises: an extension spring, it has and is supported in first end on one of this pick-up roller assembly and second connecting rod and is supported in second end on this frame.

23. the paper feed of an imaging device comprises: one first driven roller; One pick-up roller; One second driven roller; One wobble gear parts, it selectively is sent to propulsive effort one of this first driven roller and second driven roller, with a unidirectional power transfer member, it and the coaxial setting of this first driven roller only are used for when this first driven roller is rotated in a first direction, propulsive effort are sent to this pick-up roller.