Patent Application
20110297767
1. Field of Invention
The invention relates to a shredder and, in particular, to a one-way driving mechanism for the paper-removal device of a shredder.
2. Related Art
According to the cutting methods, shredders can be classified as stripe-cut shredders that cut paper into stripes and cross-cut shredders that cut paper into chips.
The shredding head of the stripe-cut shredder can be used independently. The shredding head of the cross-cut shredder must be accompanied with a trash bin. The reason is that the lower part of the shredding head of the cross-cut shredder is an open paper outlet. When the shredding head and the trash bin are separate, its user may hurt himself by putting his hand into the paper outlet and getting cut by the running blades. To prevent this, the shredding head of the cross-cut shredder has to have a safety switch and the trash bin is usually provided with a protruding block corresponding to the switch. When the shredding head and the trash bin are combined, the protruding block urges against the safety switch so that the shredder is power-on and can run normally. When the shredding head and the trash bin are separate, the protruding block leaves the safety switch so that the safety switch automatically turns off the power for the shredder. In this case, the blades will not hurt the user even if he puts his hand into the paper outlet.
The shredding head of the cross-cut shredder is restricted to be equipped with a special trash bin and cannot be used along. Therefore, the production and distribution costs of the cross-cut shredders are still relatively high.
To prevent the user from being hurt by putting hands into the paper inlet of the cross-cut shredder, the shredder disclosed in PROC Pat. No. 200610052985.8 uses a paper-feeding mechanism under the paper inlet. The paper-feeding mechanism is basically a paper-feeding wheel that rotates with the cutting blades. With the shielding effect of the paper-feeding wheel at the paper inlet, the user's hand will not touch the cutting blades even if it is inserted into the paper inlet. This guarantees the safety, At the same time, the paper chips produced by the cutting blades can readily fall into the trash bin with the help of the paper-feeding wheel.
When the shredder is in the shredding mode, the paper-feeding mechanism functions with the rotation of the cutting blades. It indeed has a shielding effect and achieves the goal of removing paper chips. However, when the shredder is in the reverse mode, the paper-feeding wheel should be stationary. Otherwise, the reversed paper chips or paper that is not completely shredded may be jammed, affecting the normal functioning of the shredder.
In view of the foregoing, the invention provides a one-way driving mechanism for the paper removal device of a shredder. A transmission gear set is disposed between the cutting blades and paper-feeding wheels of the shredder. The primary gear of the transmission gear set is mounted on the rotary shaft of the cutting blades. The primary gear has at least one interference element. When the rotary shaft rotates in the shredding direction, the interference element connects and rotates with the end part of the rotary shaft. When the rotary shaft rotates in the reverse direction, the interference element is separate from the end part of the rotary shaft. This ensures that the paper-feeding wheels remain static in the reverse (REV) mode.
These and other features, aspects and advantages of the invention will become apparent by reference to the following description and accompanying drawings which are given by way of illustration only, and thus are not limitative of the invention, and wherein:
FIG, 3 is a side view showing the structure of the one-way driving mechanism;
The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
The disclosed one-way driving mechanism for the paper removal device of a shredder includes: cutting blades 10, paper-feeding wheels 20, and a transmission gear set 30.
The cutting blades 10 are provided at the paper inlet of the shredding head. There are two rotary shafts 11, each of which is equipped with blades of a specific type (not shown). Driven by a motor 40, the cutting blades 10 cut the paper passing through the rotary shafts 11.
The paper-feeding wheels 20 are provided at the paper outlet of the shredding head. It has at least two paper-feeding wheel shafts 21 that have a shielding effect at the paper outlet. They prevent the user from putting his hand into the running blades and getting hurt.
In practice, the paper-feeding wheels 20 are provided with two auxiliary wheel shafts 22 on the outer sides of the two paper-feeding wheel shafts 21 to enhance the paper removal effect.
Please refer to
The so-called one-way driving mechanism is as shown in
On the other hand, as shown in
With the above-described design, the paper removal device of the shredder in the AUTO mode removes paper chips into the trash bin as the rotary shaft rotates. In the REV mode of the shredder, the paper removal device does not rotate with the rotary shaft but remains static. This can effectively prevent the user from hurting his fingers.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 099210447 | Jun 2010 | TW | national |
