1. Technical Field
The present disclosure relates to transmitting apparatus, and more particularly to a transmitting apparatus of a printer.
2. Description of Related Art
A printer often equips a plurality of transmitting apparatus to transmit print medium, such as paper or a plastic sheet therein. For example, a plurality of rollers are often mounted in different positions to transmit print media and move it forwards. Each of the plurality of rollers needs a motor to rotate it. So the printer often has a plurality of motors mounted therein, which is high-cost and hard to maintain.
Therefore, there is room for improvement within the art.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one”.
The active shaft 20 is connected to a motor 90, and driven to rotate by the motor 90. The active shaft 20 includes a bush mounting portion 21, a bush sliding portion 22, and a stopper mounting portion 23. In cross section, the bush mounting portion 21, the bush sliding portion 22, and the stopper mounting portion 23 are not circular. A bush rotating portion 26 is located between the bush sliding portion 22 and the stopper mounting portion 23.
The fixing bush 30 can be mounted on the bush mounting portion 21 of the active shaft 20. The fixing bush 30 defines a non-circular fixing hole 31 corresponding to the bush mounting portion 21. A positioning post 34 protrudes from an outer surface of fixing bush 30.
The sliding bush 40 can be slidably set on the bush sliding portion 22 of the active shaft 20. The sliding bush 40 defines a non-circular set hole (not shown) corresponding to the bush sliding portion 22. A size of the bush rotating portion 26 is smaller than a size of the set hole. The sliding bush 40 can slide to the bush rotating portion 26, and can rotate on the rotating portion 26.
The sliding bush 40 includes a positioning piece 41 which is adjacent to the fixing bush 30. The positioning piece 41 defines an opening 42, a first positioning slot 411, a second positioning slot 412, and a third positioning slot 413. All of the slots 411, 412, and 413 communicate with the opening 42. Lengths of the first positioning slot 411, the second positioning slot 412, and the third positioning slot 413 are all different. The sliding bush 40 is equipped with an active gear 46.
The stopper 60 defines a non-circular mounting hole 61 corresponding to the stopper mounting portion 23 of the active shaft 20.
To transmitting a paper in the printer, the sliding bush 40 slides on the active shaft 20 from the bush sliding portion 22 to the bush rotating portion 26. The sliding bush 40 rotates on the rotating portion 26 to align the first positioning slot 41 with the positioning post 34. Then the sliding bush 40 is released and the spring 50 rebounds to push sliding bush 40 back to the bush sliding portion 22. The positioning post 34 of the fixing bush 30 is received in the first positioning slot 41. At this position, the active gear 45 meshes with the first passive gear 71. The motor 90 drives the active shaft 20 to rotate the sliding bush 40. The active gear 45 drives the first passive gear 71 to rotate the roller to move the paper.
After the paper is advanced by the first passive gear 71, the motor 90 stops rotating. The sliding bush 40 slides again on the active shaft 20 from the bush sliding portion 22 to the bush rotating portion 26. The sliding bush 40 rotates on the rotating portion 26 to align the second positioning slot 42 with the positioning post 34. Then the sliding bush 40 is released and the spring 50 rebounds to push sliding bush 40 back to the bush sliding portion 22. The positioning post 34 of the fixing bush 30 is received in the second positioning slot 42. At this position, the active gear 45 meshes with the second transmitting gear 72. The motor 90 rotates the active shaft 20 to bring the sliding bush 40 into rotation. The active gear 45 drives the second transmitting gear 72 to rotate the roller to further advance the paper.
After the paper is passed on by the second transmitting gear 72, the motor 90 stops rotating. The sliding bush 40 slides again on the active shaft 20 from the bush sliding portion 22 to the bush rotating portion 26. The sliding bush 40 rotates on the rotating portion 26 to align the third positioning slot 43 with the positioning post 34. Then the sliding bush 40 is released and the spring 50 rebounds to push sliding bush 40 back to the bush sliding portion 22. The positioning post 34 of the fixing bush 30 is received in the third positioning slot 43. At this position, the active gear 45 meshes with the third transmitting gear 73. The motor 90 rotates the active shaft 20 to rotate the sliding bush 40. The active gear 45 rotates the third transmitting gear 73 to rotate the roller rotate to move the paper on.
In the transmitting apparatus, the active gear 45 first rotates the first transmitting gear 71, then the second transmitting gear 72, and then the third transmitting gear 73. The first transmitting gear 71, the second transmitting gear 72, and the third transmitting gear 73 act one after the other to move the paper through the printer. Therefore, only one motor 90 is required to drive a plurality of gears and rollers.
It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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101121218 | Jun 2012 | TW | national |