1. Field of the Invention
The present invention generally relates to a pickup mechanism, and more particularly to a pickup mechanism capable of picking up paper steadily.
2. The Related Art
A conventional pickup mechanism generally includes a paper pressing board, a pickup assembly, at least one stopper assembly and a drive assembly. When the conventional pickup mechanism is operated, the drive assembly is needed to drive the pickup assembly by way of a cam or a connecting rod to feed paper to a scanning area. When the paper is completed scanning, the drive assembly drives the stopper assembly by way of the cam or the connecting rod to restore a status of preparing for picking up the paper so as to facilitate a user to place the paper.
However, the drive assembly drives the pickup assembly by way of the cam or the connecting rod that will increase corresponding transmission components and further increase an assembling complexity of the transmission components to increase costs of assembling space and assembling hours, and furthermore it's apt to make a down force of the left side of the paper pressing board unequal to that of the right side of the paper pressing board to cause an unbalanced down force exerted on the paper when the pickup assembly picks up the paper to generate a tilt problem of picking up paper. As a result, a stability of the pickup mechanism is affected.
So how to improve the above-mentioned problem through a structural design of the pickup mechanism has become an important issue which is needed to be solved by professional people, accordingly, an innovative pickup mechanism which has a proper structural design is needed to be provided to effectively improve the above-mentioned problem so as to make the pickup mechanism capable of picking up the paper steadily.
An object of the present invention is to provide a pickup mechanism. The pickup mechanism includes a mechanical frame, at least one pickup roller, a paper pressing board, a transmitting element, a cover, at least one stopper element and at least one elastic element. The mechanical frame defines at least one locating groove. The pickup roller is disposed under the mechanical frame and partially passed through the locating groove to project above the mechanical frame. The paper pressing board is disposed above the mechanical frame. And the paper pressing board has a bottom board. A top of the bottom board protrudes upward to form a movable portion. A front of the movable portion defines a driven link. The transmitting element is cooperated with the driven link of the paper pressing board to bring along the paper pressing board to be pressed downward and be raised up. The cover is covered on the paper pressing board. And the cover has a top wall. A bottom of the top wall protrudes downward to form a locking part. The stopper element is pivotally mounted to the paper pressing board. The elastic element is elastically disposed between the cover and the paper pressing board. The transmitting element is capable of rotating freely, the paper pressing board is pressed downward by virtue of an elastic force of the elastic element to make the pickup roller generate a normal force for picking up paper, the stopper element breaks away from a restraint of the locking part with the paper pressing board being pressed downward to make the stopper element to move freely, the paper is fed by virtue of the pickup roller rotating along a first direction and pushing away the stopper element, and when there is no paper, the transmitting element rotates along a second direction opposite to the first direction, the paper pressing board is raised up to an original position by virtue of the transmitting element bringing along the driven link of the paper pressing board, at the moment, the stopper element rotates downward to abut against the locking part of the cover to be located at a paper blocking position on account of gravity or other external forces thereof, with the paper pressing board being raised up, the paper blocking function of the stopper element is realized by virtue of the constraint of the locking part.
As described above, the transmitting element brings along the paper pressing board to be pressed downward or be raised up to make the pickup roller generate the normal force for picking up the paper or the stopper element realize the paper blocking function, comparing with the drive assembly driving the pickup assembly by way of the cam or the connecting rod in prior art, the pickup mechanism will decrease corresponding transmission components and further ensure an assembling simplicity of the transmission components to decrease costs of assembling space and assembling hours, and furthermore a balanced down force exerted on the paper when the pickup roller picks up the paper, so that the pickup mechanism has a proper structural design. As a result, a stability of the pickup mechanism is ensured.
The present invention will be apparent to those skilled in the art by reading the following description, with reference to the attached drawings, in which:
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An original status of the paper pressing board 10 shows a status of being raised up, and the elastic element 50 shows a compression status.
When the drive assembly shows a non-loaded status, the transmitting element 20 is capable of rotating freely, the paper pressing board 10 is pressed downward by virtue of an elastic force of the elastic element 50 to make the pickup roller 60 generate the normal force for picking up the paper. The stopper element 40 breaks away from a restraint of the locking part 33 with the paper pressing board 10 being pressed downward to make the stopper element 40 to move freely. The paper is fed to a scanning area (not shown) by virtue of the pickup roller 60 rotating along a first direction and pushing away the stopper element 40. The bottom of the stopper element 40 departs away from the receiving groove 72. A balanced down force is exerted on the paper by the paper pressing board 10 when the pickup roller 60 picks up the paper.
When there is no paper, the transmitting element 20 driven by the drive assembly rotates along a second direction opposite to the first direction. The paper pressing board 10 is raised up to the original position by virtue of the transmitting element 20 bringing along the driven link 131 of the paper pressing board 10. At the moment, the stopper element 40 rotates downward to abut against the locking part 33 of the cover 30 to be located at a paper blocking position on account of gravity or other external forces thereof. With the paper pressing board 10 being raised up, the paper blocking function of the stopper element 40 is realized by virtue of the constraint of the locking part 33. The bottom of the stopper element 40 is received in the receiving groove 72.
As described above, the transmitting element 20 brings along the paper pressing board 10 to be pressed downward or be raised up to make the pickup roller 60 generate the normal force for picking up the paper or the stopper element 40 realize the paper blocking function, comparing with the drive assembly driving the pickup assembly by way of the cam or the connecting rod in prior art, the pickup mechanism 100 will decrease corresponding transmission components and further ensure an assembling simplicity of the transmission components to decrease costs of assembling space and assembling hours, and furthermore a balanced down force exerted on the paper when the pickup roller 60 picks up the paper, so that the pickup mechanism 100 has a proper structural design. As a result, a stability of the pickup mechanism 100 is ensured.
Number | Name | Date | Kind |
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8708332 | Cheng | Apr 2014 | B2 |
8894062 | Chen et al. | Nov 2014 | B1 |
Number | Date | Country | |
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20150274453 A1 | Oct 2015 | US |