PRINTER AND PAPER REVERSING ASSEMBLY THEREOF
A paper reversing assembly includes a paper roller, a driving member, and a plurality of balls. The paper roller includes a recess defined in an end portion thereof and a plurality of concave portions formed on the internal circumferential sidewall of the recess. The driving member is received in the recess and includes a plurality of lobes, which interact with the balls to allow the free rotation of the paper roller when the paper is being pulled out.
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1. Technical Field
The present disclosure relates to a printer and a paper reversing assembly thereof.
2. Description of Related Art
Referring to
In implementing two-sides printing, the input roller 10 rotates to carry a piece of paper from the paper tray 40 to the printing roller 20, with a first side upward and its opposed side (which is named the second side hereinafter) unavailable to the printer 100. Then, driven by the rotation of the printing roller 20, the paper is moved to a location underneath the inkjet nozzle 50 to be printed on its first side, as the first side is upward. After the printing is over, the motor reverses and drives the printing roller 20 to rotate counterclockwise, sending the paper backward into the reversing assembly 30 to be turned upside down.
Once the paper has been turned upside down by the reversing assembly 30, it is pushed out of the reversing assembly 30, while its front portion reaches the printing roller 20 and the second side is facing up then. At that moment, the motor reverses again, switching the printing roller 20 back to rotate clockwise, and carrying the paper to the inkjet nozzle 50 to be printed on its second side. Meanwhile, the rollers of the paper reversing assembly 30 are still.
However, the aforesaid printer 100 has the following problem: when the reversing of the paper is finished, its front portion reaches the printing roller 20 while its rear portion is still inside the reversing assembly 30. Since the reversing assembly 30 has stopped rotating, the rear portion of the paper is trapped between the lowest roller of the reversing assembly 30 and its corresponding auxiliary roller 300. Under these circumstances, the paper is pulled out by the force provided by the rotation of the printing roller 20 while the lowest roller is still, and the still roller will block the moving of the paper. Thus, not only will ugly indentations be made on the paper, but also the printed image may be blurred since the transmission of the paper is unsteady.
The components of the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments of a printer and a paper reversing assembly thereof. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views.
The present disclosure is related to a printer and a paper reversing assembly thereof, more particular to an improved paper reversing assembly which can replace the paper reversing assembly 30 of the conventional printer 100 shown in
In this embodiment, the paper entry point into the paper reversing assembly 30a adjacent to the first roller 301 is defined as the paper-in access; and the paper exit point from the paper reversing assembly 30a adjacent to the third roller 303 is defined as the paper-out portion.
In implementing the printing of both sides of a piece of paper, the input roller 10 and the printing roller 20 rotate clockwise as indicated, and the rollers 301-303 of the paper reversing assembly 30a do not move then. Then, once the paper is required to be turned upside down, the printing roller 20 rotates counterclockwise to send the paper backward into the reversing assembly 30a. At this time, the first roller 301 and the third roller 303 rotate counterclockwise and the second roller 302 rotates clockwise as indicated. The first roller 301, the second roller 302 and the third roller 303 cooperate with their corresponding auxiliary rollers 300 in handling the paper. The paper is turned upside down thereby.
The rollers 301-303 have the same structure in the embodiment.
Referring to
The paper roller 33 includes a shaft body 331 and at least one rolling wheel 334, wherein the rolling wheel 334 may be made of, but is not limited to, rubber. A recess 332 is defined in an end face on each end of the shaft body 331. Several concave portions 333 are recessed in an internal circumferential surface of the shaft body 331 in the recess 332. The lobes 3121 of the driving member 31 are for engagingly received in the recess 332.
Referring to
Referring to
Referring to
Referring to
In another embodiment, the paper reversing assembly 30a has only one roller of the aforesaid structure, with the other rollers being conventional.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the disclosure.
Claims
1. A paper reversing assembly for a printer, comprising:
- a plurality of balls;
- a paper roller including a recess defined in an end face thereof; and a plurality of concave portions recessed in an internal circumferential surface of the paper roller in the recess for engagingly receiving the balls therein, each concave portion including a first surface tangentially adjoining to the inner circumferential surface for guiding the ball to smoothly move into the concave portion, and a second surface steeply inclined relative to the inner circumferential surface; and
- a driving member configured for driving the paper roller to rotate therewith, the driving member including: a plurality of radially extending lobes, the lobes spaced from each other and engagingly received in the recess, each lobes having a curved surface at a first side and a substantially flat surface at an opposing second side thereof, the driving member configured for rotating in a rotating direction in the recess such that the balls are moved by the corresponding substantially flat surfaces of the lobes in the rotating direction and retained in the corresponding recesses, thus enabling the paper roller to rotate with the rotation of the driving member.
2. A printer comprising a paper reversing assembly of claim 1.
Type: Application
Filed: Nov 16, 2011
Publication Date: Jan 31, 2013
Applicant: HON HAI PRECISION INDUSTRY CO., LTD. (Tu-Cheng)
Inventor: CHANG-HSIU WU (Tu-Cheng)
Application Number: 13/297,272
International Classification: B65H 5/26 (20060101);