PAPER SEPARATION STRUCTURE
A paper separation structure includes: an actuating unit being selectable to generate a forward and reverse actuating torque (T); a one-way actuator connected to said actuating unit and being able to break the connection of said actuating unit while said actuating unit generates a reverse actuating torque (T); a breaking unit having a threshold of breaking torque (TL1), and said braking torque (TL1) set lower than said actuating torque (T); and a separating roller connected to said one-way actuator and said braking unit to receive said actuating torque (T) and said braking torque (TL1). With the combination of components mentioned above, the paper separation structure of the present invention has a plurality of torque thresholds for paper separation and can switch between active and passive separation modes according to requirements.
The present application is based on, and claims priority form, Taiwan Patent Application No. 108202040, filed Feb. 18, 2019, the disclosure of which is hereby incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION 1. Field of the InventionThis invention relates to a paper separation structure, especially to a paper separation structure having a plurality of torque thresholds for paper separation, and switchable between active and passive separation modes according to requirements.
2. The Related ArtIn order to prevent the document overlaps as picked up, a paper separation structure will be arranged next to the pick-up module in the automatic document feeder. Conventional paper separation structures could be sort into active paper separation structure and passive paper separation structure, both will be described below. Referring to
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The objective of the present invention is to provide a paper separation structure to overcome the lack and defects in the conventional document feeding structure.
To achieve said objective, the present invention discloses a paper separation structure includes: an actuating unit being selectable to generate an actuating torque (T) in forward and reverse direction; a one-way actuator connected to said actuating unit and being able to break the connection of said actuating unit while said actuating unit generates the reverse actuating torque (T); a breaking unit having an upper limit of breaking torque (TL1), and said upper limit of braking torque (TL1) set less than said actuating torque (T); and a separating roller connected to said one-way actuator and said braking unit to receive said actuating torque (T) and said braking torque (TL1).
In a preferred embodiment, wherein said breaking unit is a first torque limiter, of which one end is secured and the other end is connected to said separating roller.
In a preferred embodiment, wherein among said separating roller, said one-way actuator, and said breaking unit further arranged a transmission unit which comprising a first transmitting gear and a second transmitting gear meshed to each other, wherein said first transmitting gear connected to both said one-way actuator and said breaking unit for receiving said actuating torque and said braking torque, and said second transmitting gear connected to said separating roller for transmitting the mixed breaking torque mixed with said actuating torque and said braking torque to said separating roller.
In a preferred embodiment, wherein said actuating unit is an electronically controlled motor.
In a preferred embodiment, wherein said breaking unit is a first torque limiter, of which one end is secured and the other end is connected to said transmission unit.
In a preferred embodiment, wherein a second torque limiter is further disposed between said separating roller and said transmission unit, and said transmission unit transmitting actuating torque to said separating roller through said second torque limiter.
In a preferred embodiment, wherein the upper limit of the braking force that said actuating unit provided by the internal resistance is (Tm), and the upper limit of the transmission force provided by said second torque limiter is (TL2), and wherein (Tm)+(TL1)>(TL2), (TL2)>(TL1).
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:
In order to describe the technical contents, structural features, purpose to be achieved and the effectiveness of the present invention, the detailed description is given with schema below.
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Because said mixed torque (Tmix) exported to documents is mixed by said actuating torque (T) and said breaking torque (TL1), the value of mixed torque (Tmix) can be adjusted by adjusting said actuating torque (T). Thus, the paper separation structure in this embodiment can switch between active and passive document-separating mode and adjusts threshold of torque to fit different document feeding situations.
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In the second embodiment, said transmission unit 30 is set to a gear set which comprises a first transmitting gear 31 and a second transmitting gear 32 meshed with each other. Said first transmitting gear 31 connects to both said one-way actuator 11 and said breaking unit 20 for receiving said transmitting torque (T) and said braking torque (TL1). Said breaking unit 20 is a first torque limiter 21, of which one end is secured and the other end is connected to said transmission unit 30. Therefore, if the torque transmitted to said transmission unit 30 is smaller than the upper limit of breaking torque (TL1) of said first torque limiter 21, said transmission unit 30 would stop rotating due to the limit of said first torque limiter 21. With the structure of said transmission unit 30, the reduction ratio and the torque ratio can be adjusted to make the structure design of said paper separation structure more flexible.
In this embodiment, a second torque limiter 41 is arranged between said separating roller 40 and said transmission unit 30 for transmitting mixed torque (Tmix) to said separating roller 40. Said second torque limiter 41 also has an upper limit of transmitting force (TL2) which meets the following conditions: Tm+TL1>TL2, TL2>TL1.
There is one thing has to be mentioned, for simplifying the diagram and the situation, said first transmitting gear 31 and said second transmitting gear 32 has been simplified to a gear set with gear ratio equals to one; said gear set has been set among said one-way actuator 11, said breaking unit 20 and said separating roller 40; and there is no other reducer being set between said transmission unit 30 and said separating roller 40 in this embodiment. Which results in the original torque and the breaking torque generated by actuating unit 10, first torque limiter 21 and second torque limiter 41 are not changed or multiplied during the transmission, and the original torque/breaking torque and final torque/breaking torque equals to one. However, said gear set could be set with various types or quantities of gears to fit the needs of different gear ratio or transmitting directions in practice. Therefore, the position and structure of said transmission unit 30 should not be limited by this embodiment, and the actuating torque, breaking torque or other transmitting force listed above and below are all referred to the output torque/braking force, of which the value is multiplied by said transmission unit 30.
Referring to
Moreover, since a second torque limiter 41 is further disposed between said separating roller 40 and said transmission unit 30, said paper separation structure in the second embodiment can also prevent the paper separation resistance from being excessive during the active paper separation process. The mixed torque (Tmix) outputted by the transmitting unit 30 is limited by the upper limit (TL2) of said second torque limiter 41, so that said separating roller 40 rotates forward to separates paper in casual states, but slips with the paper to prevent the paper from being damaged if an abnormal state such as a paper jam occurs and makes the resistance greater than the threshold of said second torque limiter 41.
In
However, since the braking torque (Tm) provided by the internal resistance of said electronically controlled motor 12 is not always a fixed value, it makes said mixed torque (Tmix) variable. To avoid that, the mixed torque (Tmix) supplied to said separating roller 40 is further filtered by said second torque limiter 41 and limited to the upper limit of torque (TL2) of said second torque limiter 41. In result, said separating roller 40 separates documents passively under said limited mixed torque (TL2).
In
And because the upper torque limit of said second torque limiter 41 (TL2) is greater than the upper torque limit of said first torque limiter 21 (TL1), said second torque limiter 41 herein functions like a common shaft. With the combination of said components, the paper separation structure in this embodiment can switch between active and passive document separating mode and adjust the resistance in passive document separating mode according to the characteristic of documents.
As described above, with the various combinations of components mentioned above, the paper separation structure of the present invention has a plurality of torque thresholds for paper separation, and can switch between active and passive separation modes according to requirements.
Claims
1. A paper separation structure includes:
- an actuating unit being selectable to generate an actuating torque (T) in forward and reverse direction;
- a one-way actuator connected to said actuating unit and being able to break the connection of said actuating unit while said actuating unit generates the reverse actuating torque (T);
- a breaking unit having an upper limit of breaking torque (TL1), and said upper limit of braking torque (TL1) set less than said actuating torque (T); and
- a separating roller connected to said one-way actuator and said braking unit to receive said actuating torque (T) and said braking torque (TL1).
2. The paper separation structure as claimed in claim 1, wherein said breaking unit is a first torque limiter, of which one end is secured and the other end is connected to said separating roller.
3. The paper separation structure as claimed in claim 1, wherein among said separating roller, said one-way actuator, and said breaking unit further arranged a transmission unit which comprising a first transmitting gear and a second transmitting gear meshed to each other, wherein said first transmitting gear connected to both said one-way actuator and said breaking unit for receiving said actuating torque and said braking torque, and said second transmitting gear connected to said separating roller for transmitting the mixed breaking torque mixed with said actuating torque and said braking torque to said separating roller.
4. The paper separation structure as claimed in claim 1, wherein said actuating unit is an electronically controlled motor.
5. The paper separation structure as claimed in claim 3, wherein said breaking unit is a first torque limiter, of which one end is secured and the other end is connected to said transmission unit.
6. The paper separation structure as claimed in claim 3, wherein a second torque limiter is further disposed between said separating roller and said transmission unit, and said transmission unit transmitting actuating torque to said separating roller through said second torque limiter.
7. The paper separation structure as claimed in claim 5, wherein the upper limit of the braking force that said actuating unit provided by the internal resistance is (Tm), and the upper limit of the transmission force provided by said second torque limiter is (TL2), and wherein (Tm)+(TL1)>(TL2), (TL2)>(TL1).
Type: Application
Filed: May 24, 2019
Publication Date: Aug 20, 2020
Inventors: Hsing Hung Lee (New Taipei), Wei Xiang Tsai (New Taipei)
Application Number: 16/421,660