CN218491003U

CN218491003U - Sheet feeding assembly, sheet feeding mechanism and image forming apparatus

Info

Publication number: CN218491003U
Application number: CN202222737240.2U
Authority: CN
Inventors: 陈锐
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-02-17
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses a sheet feeding subassembly, sheet feeding mechanism and image forming device, the sheet feeding subassembly includes: the driving piece is connected with the feeding roller so as to drive the feeding roller to move along a first movement path and a second movement path in a composite mode, wherein: the first motion path comprises the rotation motion of the feed roller along the axis of the feed roller; the second movement path includes a swinging movement of the feed roller about a predetermined axis. The utility model discloses realized that the technology simplifies, cost reduction and improvement stability under the prerequisite of guaranteeing accurate form advancing, solved current sheet and given the technical problem that mechanism production technology becomes complicated, with high costs, stability is not enough.

Description

Sheet feeding assembly, sheet feeding mechanism and image forming apparatus

Technical Field

The utility model relates to a printing apparatus technical field, especially a sheet feeding subassembly, sheet feeding mechanism and image forming device.

Background

A sheet feeding mechanism is widely used in various types of image forming apparatuses. A conventional sheet feeding mechanism 21' of the type known in the stomach as shown in fig. 1:

the sheets are stacked on the supporting member 18', and a returning member (spring) 19' is provided below the supporting member 18', and the supporting member 18' holds up the sheet placed thereon upward to the paper feed roller 14 'under the action of the returning member (spring) 19', and the paper feed roller 14 'performs a circular motion along with the shaft 13', and picks up the uppermost sheet to send out for sheet feeding. In addition, in order to avoid double feeding caused by friction between the uppermost sheet and the lower sheet, a separator assembly is required.

The traditional sheet feeding mechanism has too many parts, so that the production cost is increased, and the production process is complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sheet feeding subassembly, sheet feeding mechanism and image forming device to solve the sheet feeding mechanism production technology among the prior art complicated, with high costs, the not enough technical problem of stability.

In a first aspect, the present invention provides a sheet feeding assembly, including: the driving piece is connected with the feeding roller so as to drive the feeding roller to move along a first movement path and a second movement path in a composite mode, wherein:

the first motion path comprises the rotation motion of the feed roller along the axis of the feed roller;

the second motion path comprises a swing motion of the feed roller along a preset axis as a center.

The sheet feeding assembly as described above, wherein preferably, an inner tooth groove is formed on an axial end surface of the feeding roller, and an inner gear ring and a first ring body are provided on an inner wall surface of the inner tooth groove;

the driving piece comprises a transmission gear, a planetary gear and a transmission shaft, the preset axis is coincident with the axis of the transmission shaft, the axis of the transmission shaft is staggered with the axis of the feeding roller, the transmission gear is fixed on the transmission shaft, the planetary gear is meshed with the transmission gear and the inner gear ring at the same time, the transmission shaft drives the transmission gear to rotate, and then the feeding roller is driven to move along the first movement path through the planetary gear;

the feeding roller swings around the axis of the transmission shaft under the action of self gravity, and then the second motion path is formed.

In the sheet feeding assembly, preferably, the transmission shaft is sleeved with a second ring, and an outer ring surface of the second ring abuts against an inner ring surface of the first ring to limit axial play of the feeding roller.

A sheet feeding assembly as described above, wherein the outer peripheral surface of the feeding roller is preferably coated with a rubber ring layer to increase a frictional force when the feeding roller contacts the sheet.

In a second aspect, the present application also provides a sheet feeding mechanism comprising:

a container provided with a holding space for holding sheetsBetweenA supporting surface for supporting the sheet is formed at the bottom of the accommodating body, an opening part is formed at one end of the accommodating body, and the sheet can be sent out of the accommodating space from the opening part;

the sheet feeding assembly is disposed above the accommodating body, and is configured to feed out the sheets one by one from the opening portion.

In the sheet feeding mechanism, it is preferable that a guide slope for guiding the sheet to be fed out from the accommodating space is formed on a side surface of the accommodating body, the guide slope being provided obliquely to the supporting surface.

In the sheet feeding mechanism, it is preferable that the guide slope is provided with a plurality of first friction plates in contact with each other, and a friction force between a leading end of the sheet and the guide slope when the sheet is fed is increased to separate the sheets stacked up and down from each other, thereby preventing one or more sheets from being fed at a time.

In the sheet feeding mechanism, it is preferable that a mounting groove is formed in the supporting surface, a driven roller is provided in the mounting groove, and when all the sheets are fed out, the driven roller abuts against the feeding roller and rotates together with the feeding roller to cancel friction between the feeding roller and the supporting surface.

In the sheet feeding mechanism, it is preferable that a second friction plate is provided on the supporting surface, and the second friction plate is disposed obliquely to the supporting surface to increase a friction force between the sheet located at the bottom and the bottom of the accommodating body.

In a third aspect, the present application also provides an image forming apparatus provided with the aforementioned sheet feeding mechanism.

Compared with the prior art, the utility model discloses a set up the feed roller that can follow first motion route and second motion route motion, realized that technology simplifies, cost reduction and improvement stability under the prerequisite of guaranteeing the accurate form advancing, solved the sheet feeding mechanism production technology on the current image forming device and become complicated, with high costs, the not enough technical problem of stability.

Drawings

FIG. 1 is a schematic view of a prior art sheet feed mechanism;

FIG. 2 is an isometric view of a sheet feed mechanism of an embodiment provided herein;

FIG. 3 is a side view of a sheet feed mechanism of an embodiment provided herein;

FIG. 4 is an exploded schematic view of a sheet feed assembly of an embodiment provided herein;

fig. 5 is an isometric view of an image forming apparatus of an embodiment provided herein.

Description of the reference numerals:

10-a containing body, 11-a containing space, 12-a supporting surface, 13-an open part, 14-a guide inclined surface, 15-a first friction plate, 16-a mounting groove, 17-a driven roller and 18-a second friction plate;

20-a sheet feeding assembly, 21-a feeding roller, 22-an annular gear, 23-a first ring body, 24-a transmission gear, 25-a planetary gear, 26-a transmission shaft, 27-a second ring body and 28-a rubber ring layer;

30-a sheet material;

100-an image forming apparatus;

d1-first direction.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 2 to 4, the present invention provides a sheet feeding mechanism, which includes a housing 10 and a sheet feeding assembly 20, wherein:

the accommodating body 10 is provided with an accommodating space 11 for accommodating sheets 30, in the embodiment of the present application, the sheets 30 are used as a printing medium for depositing printing fluid such as ink, a supporting surface 12 for supporting the sheets 30 is formed at the bottom of the accommodating body 10, a plurality of sheets 30 are stacked on the supporting surface 12, adjacent sheets 30 are separable, due to printing needs, the adjacent sheets 30 need to be separated and then sent out page by page, an open portion 13 is formed at one end of the accommodating body 10, and the sheets 30 can be sent out of the accommodating space 11 from the open portion 13.

In the embodiment provided by the present application, referring to fig. 3, the accommodating body 10 is a box structure, a top surface of the box structure is recessed to form an accommodating space 11, a bottom portion and a top portion of the accommodating body 10 are disposed opposite to each other along the first direction D1, and the opening portion 13 is formed above the supporting surface 12 in the gravity direction for sending out the sheet 30.

The sheet feeding assembly 20 is disposed at the opening portion 13, the sheet feeding assembly 20 includes a feeding roller 21 and a driving member connected to the feeding roller 21 to drive the feeding roller 21 to move along a first movement path and a second movement path, wherein: the first movement path comprises the rotary movement of the feed roller 21 centered along its own axis; the second movement path comprises an oscillating movement of the feed roller 21 centered along a preset axis. In the embodiment of the present application, the outer contour surface of the feed roller 21 has an arc surface structure such as a circumferential surface or an elliptical surface.

Referring to fig. 2 to 4, an inner spline is formed on an axial end surface of the feed roller 21, and an inner ring gear 22 is provided on an inner wall surface of the inner spline.

The driving member includes a transmission gear 24, a planetary gear 25 and a transmission shaft 26, the transmission shaft 26 is connected with a power source to enable the transmission shaft 26 to rotate, the power source can be provided by a component inside the image forming apparatus 100, or a separate motor can be provided, and the like, without limitation, the transmission gear 24 is fixed on the transmission shaft 26 to serve as a sun gear, the transmission gear 24 is fixed on the transmission shaft 26, the transmission shaft 26 penetrates through the transmission gear 24, the planetary gear 25 is simultaneously engaged with the transmission gear 24 and the inner gear ring 22, the transmission shaft 26 rotates as the power source provides power to the transmission shaft 26, and the power is sequentially transmitted to the feed roller 21 through the transmission gear 24 and the planetary gear 25, so that the feed roller 21 can move along a first movement path, that is, to perform circular rotation.

As shown in fig. 2 to 4, a first ring body 23 is disposed on an inner wall surface of the inner tooth socket, an outer ring surface of the first ring body 23 is attached to the inner wall surface of the inner tooth socket, the transmission shaft 26 passes through the first ring body 23, a preset axis is coincident with an axis of the transmission shaft 26, the axis of the transmission shaft 26 is offset from an axis of the feed roller 21, a diameter of the planetary gear 25 is larger than an inner diameter of the transmission gear 24, ends of the transmission gear 24 and the planetary gear 25 abut against an inner side surface of the first ring body 23, so that the first ring body 23 can limit movement of the transmission gear 24 and the planetary gear 25 in an axis direction.

The transmission shaft 26 is sleeved with a second ring 27, the second ring 27 is connected with the transmission gear 24, preferably in an integrally formed manner, so as to improve the overall strength, in a feasible embodiment, the second ring 27 is a shoulder on the transmission shaft 26, an inner annular surface of the second ring 27 is attached to an outer circumferential surface of the transmission shaft 26, an outer annular surface of the second ring 27 abuts against an inner annular surface of the first ring 23, the first ring 23 and the second ring 27 are always in stable annular surface contact, so as to achieve stable transmission, the transmission shaft 26 rotates as the power source provides power to the transmission shaft 26, the outer annular surface of the second ring 27 and the inner annular surface of the first ring 23 internally roll, and the feed roller 21 swings around the transmission shaft 26 in a second motion path by the gravity and the motion trend of the feed roller 21. That is, the second movement path is an eccentric oscillation of the feed roller 21 about the drive shaft 26 as a rotation center.

Referring to fig. 3, in a possible embodiment, a feeding roller 21 is located above a receiving body 10, the feeding roller 21 extends into the receiving space 11 and contacts with the uppermost sheet 30 during the movement of the feeding roller 21, a frictional force is given to the sheet 30 by the self-rotation movement and the downward swing of the feeding roller 21, the frictional force has an upward component and a component in the swing direction, so that the uppermost sheet 30 can be transported out, and then continuously swings to the position of the next sheet 30, and the individual sheets 30 are separated and transported out, thereby achieving process simplification, cost reduction and stability while ensuring accurate paper feeding, compared to the prior art in which a return member 19' is required to be provided on a supporting member 18' (corresponding to a supporting surface 12 of the present application) to achieve sheet 30 sheet-by-sheet feeding, the supporting surface 12 for supporting the sheet 30 does not need to be provided with a return member 19', but is provided on a combined movement of the feeding roller 21, the surface of the uppermost sheet 30 under its own weight, and the sheet 30 can be directly placed in the receiving body 10, thereby solving the problems of additional problems of the prior art, such as additional cost and additional stability required by the prior art.

In the embodiment of the present application, as shown in fig. 3, several sheets 30 are stacked in the first direction D1, and the movable distance of the second movement path in the first direction D1 is larger than the height of the stack of sheets 30 to realize the swing of the feed roller 21 only on the side of feeding the sheets 30. The rotation of the feed roller 21, the swinging down pressure providing the sheet 30 feeding, and the swinging automatically decreasing with the decrease of the sheet 30 are achieved through a series of movements.

In the embodiment provided by the present application, the outer circumferential surface of the feeding roller 21 is coated with the rubber ring layer 28, the rubber ring layer 28 includes but is not limited to rubber material for increasing the friction force when contacting with the sheet 30, during the operation of the feeding roller 21, the outer surface of the rubber ring layer 28 contacts with the sheet 30, and the sheet 30 on the uppermost layer is provided with sufficient friction force to separate from the adjacent sheet 30 and is conveyed out through the opening portion 13.

Referring to fig. 2 and 3, a guide slope 14 is formed on a side surface of the accommodating body 10, a bottom of the guide slope 14 is continuous with an edge of the supporting surface 12, the guide slope 14 is obliquely disposed on the supporting surface 12, the feeding roller 21 separates the uppermost sheet 30 from the adjacent lower sheet 30, and the guide slope 14 guides the sheet 30 to be fed out from the accommodating space 11 to other components in the image forming apparatus 100 through the guide slope 14, thereby preventing a paper jam or a leading edge breakage of the sheet 30 during the conveyance of the sheet 30.

As shown in fig. 2 and 3, the guide slope 14 is provided with a plurality of first friction plates 15, and the first friction plates 15 are used to provide friction force to the front end of the sheet 30. When a plurality of sheets 30 are simultaneously transmitted due to mutual friction force, the front end of each sheet 30 is in contact with the first friction plate 15, friction force is generated between the front end of each sheet 30 and the first friction plate 15, the uppermost sheet 30 is directly acted by the acting force of the feeding roller 21, the lower layer carried-out sheet 30 is indirectly acted, the advancing power is smaller than that of the uppermost sheet, therefore, the uppermost sheet 30 can overcome the friction force given to the front end of the sheet 30 by the first friction plate 15 and can be sent out from the open part 13, and other sheets 30 of the lower layer cannot overcome the friction force of the first friction plate 15 and are still remained in the accommodating space 11, so that the sheets 30 are separated and transmitted one by one, more than one sheet 30 is prevented from being sent out at one time, and printing faults such as re-sending of the sheets 30 are avoided.

In the embodiment of the present application, as shown in fig. 2 and 3, a mounting groove 16 is formed in the supporting surface 12, a driven roller 17 is disposed in the mounting groove 16, a surface of the driven roller 17 is flush with the supporting surface 12 or slightly higher than the supporting surface 12, and when all the sheets 30 are fed out, the driven roller 17 abuts against the feeding roller 21 and rotates along with the feeding roller 21 to offset friction between the feeding roller 21 and the supporting surface 12.

Referring to fig. 2 and 3, the supporting surface 12 is provided with a second friction plate 18, the second friction plate 18 protrudes from the supporting surface 12, and when only a few sheets 30 remain in the accommodating space 11 in order to increase the friction between the bottom sheet 30 and the bottom of the accommodating body 10, the friction of the bottom sheet 30 is greater than that of the top sheet 30 when the uppermost sheet 30 is separated, so that the sheets 30 are not fed out together.

Alternatively, second friction plate 18 is disposed obliquely to support surface 12. In the advancing direction of the sheet 30 placed in the accommodating space 11, the end of the second friction plate 18 which is in contact with the front end of the sheet 30 first is flush with the supporting surface 12, and the second friction plate 18 gradually protrudes from the surface of the supporting surface 12 along with the advance of the sheet 30, so that the front end of the sheet 30 can be prevented from being pushed against the sheet 30 during the placing process, and the front end of the sheet 30 can be prevented from being damaged.

Based on the above-described embodiments, referring to fig. 5, the present application also provides an image forming apparatus 100, the image forming apparatus 100 being an apparatus that forms an image on a printing medium according to an input signal. Such as printers, copiers, facsimile machines, and multifunction printers that integrate the functions of printers, copiers, and facsimile machines.

In a possible embodiment, the image forming apparatus 100 includes 4 process cartridges, each of the 4 process cartridges corresponds to 4 printing colors, a laser scanning unit, a developing unit and a transfer unit are disposed in each process cartridge, the 4 process cartridges share one sheet feeding mechanism, the sheet feeding mechanism supplies the sheets 30 stored in the accommodating body 10 one by one to a conveying unit in the image forming apparatus 100, the sheets 30 are conveyed to the developing unit through the conveying unit, a charged photosensitive drum is disposed in the developing unit, and laser with image information is irradiated through the laser scanning unit to form a latent image on the surface of the photosensitive drum. And transferring the carbon powder to the photosensitive drum through a developing roller of the developing unit to develop the latent image on the surface of the photosensitive drum to form a carbon powder image. The developing unit cooperates with the transfer unit to transfer the toner image on the photosensitive drum to the sheet 30. The fixing unit is used for heating and melting the carbon powder on the sheet 30 with the formed carbon powder image and fixing the carbon powder on the sheet 30. The discharge unit is used to discharge the sheet 30 on which the toner image has been formed out of the image forming apparatus 100.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A sheet feed assembly, comprising: the driving part is connected with the feeding roller so as to drive the feeding roller to move along a first movement path and a second movement path in a composite manner, wherein:

the first motion path comprises the rotation motion of the feeding roller along the axis of the feeding roller;

2. A sheet feed assembly according to claim 1, wherein:

an inner tooth groove is formed on the axial end face of the feed roller, and an inner gear ring and a first ring body are arranged on the inner wall face of the inner tooth groove;

3. A sheet feed assembly according to claim 2, wherein: the transmission shaft is sleeved with a second ring body, and the outer ring surface of the second ring body is abutted against the inner ring surface of the first ring body so as to limit the axial movement of the feed roller.

4. A sheet feed assembly according to claim 1, wherein: the outer circumferential surface of the feeding roller is coated with a rubber ring layer so as to increase the friction force when the feeding roller is contacted with the sheet.

5. A sheet feeding mechanism, comprising:

the sheet feeding device comprises a containing body, a feeding device and a feeding device, wherein the containing body is provided with a containing space for containing sheets, a supporting surface for supporting the sheets is formed at the bottom of the containing body, an opening part is formed at one end of the containing body, and the sheets can be fed out of the containing space from the opening part;

the sheet feeding assembly of any one of claims 1 to 4, provided above the container for feeding out the sheets one by one from the opening portion.

6. The sheet feeding mechanism according to claim 5, wherein: the side surface of the accommodating body is provided with a guide inclined surface, the guide inclined surface is obliquely arranged on the supporting surface, and the guide inclined surface is used for guiding the sheet to be sent out from the accommodating space.

7. The sheet feeding mechanism according to claim 6, wherein: the guide inclined plane is provided with a plurality of first friction plates in a fit mode, so that the friction force between the front end of the sheet and the guide inclined plane when the sheet is sent out is increased, the sheets stacked up and down are separated from each other, and more than one sheet is prevented from being sent out at one time.

8. The sheet feeding mechanism according to claim 5, wherein: the supporting surface is provided with an installation groove, a driven roller is arranged in the installation groove, and when all the sheets are sent out, the driven roller is abutted to the feeding roller and rotates along with the feeding roller so as to offset friction between the feeding roller and the supporting surface.

9. The sheet feeding mechanism according to claim 5, wherein: and a second friction plate is arranged on the supporting surface and is inclined to the supporting surface so as to increase the friction force between the sheet positioned at the bottom and the bottom of the accommodating body.

10. An image forming apparatus, characterized in that: the image forming apparatus is provided with the sheet feeding mechanism according to any one of claims 5 to 9.