JP2651330B2 - Paper transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper conveying apparatus capable of easily performing a paper jam when a paper being conveyed along a paper conveying path is jammed.

[0002]

2. Description of the Related Art In a conventional paper conveying apparatus, a lower paper guide and an upper paper guide are opposed to each other substantially in parallel, and a conveying roller rotated and driven by power from a driving unit is provided on the lower paper guide side. Generally, a pinch roller that is pressed against the outer peripheral surface of the roller is provided on the upper paper guide side.

Further, an upper paper guide, a pinch roller and the like are unitized as a transport unit, and the transport unit is slidably provided between a closed position for closing the upper part of the lower paper guide and an open position for opening the upper part of the lower paper guide. In some cases, when a sheet that is being transported is jammed, the transport unit is slid to an open position to easily perform the jam clearance. In addition, such a transport unit is provided with a press-contact spring that can be switched between a press-contact state in which a pinch roller is pressed against the outer peripheral surface of the transfer roller and a press-release state in which the press contact is released. When the transport unit is slid to the open position, the pressure contact spring is switched to the pressure release state.

[0004]

Even when the pressure spring is switched to the pressure release state, the pinch roller is dropped by its own weight and comes into contact with the outer peripheral surface of the transport roller. For this reason,
When the transport unit is slid, the transport roller and the pinch roller may be caught. In particular, when the transport unit is returned to the closed position after the jam has been cleared, it is very difficult to return the transport unit to the closed position because the side surfaces of the pinch roller and the transport roller come into contact with each other.

[0005]

An upper paper guide substantially parallel to the lower paper guide, a pinch roller provided on the lower paper guide side and facing a rotation driven roller, and the pinch roller And a biasing member that can be switched to a pressure contact state in which the pressure roller is pressed against the outer peripheral surface of the transport roller and a pressure release state in which the pressure contact is released, and the transport unit is disposed above the lower paper guide. In a paper transport device slidably provided between a closed position for closing and an open position for opening the upper part of the lower paper guide, the pinch roller is moved from the transport roller by switching the urging member to a pressure release state. A separating member for raising the separating unit was attached to the transport unit.

[0006]

When the urging member is switched to the pressure release state, the pinch roller is raised to a position where the pinch roller is separated from the transport roller by the separation member with this switching. Therefore, when the transport unit is slid for jam clearance or the like, the pinch roller and the transport roller are separated from each other by switching the urging member to the pressure release state, and the transport is performed without bringing the pinch roller and the transport roller into contact. You can slide the unit.

[0007]

An embodiment of the present invention will be described with reference to the drawings. First, as shown in FIGS. 3 and 4, a flat lower paper guide 1 and an upper paper guide 2 are attached to a pair of lower side frames 3 and upper side frames 4 on both sides and are provided so as to be substantially parallel to each other. The portion sandwiched between the lower paper guide 1 and the upper paper guide 2 is a paper transport path through which a paper (not shown) is transported.

Two transport roller shafts 5 are pivotally supported between a pair of the lower side frames 3 to which the lower paper guide 1 is attached, and are disposed at a predetermined distance along the transport path. A transport roller 6 is attached to each of the transport roller shafts 5, and the transport roller 6 is disposed with a part of its outer periphery protruding upward from a notch 7 formed in the lower paper guide 1. ing. A pulley 8 is attached to one end of each of the transport roller shafts 5, and a power transmission belt 9 for transmitting power from a driving unit (not shown) is wound around these pulleys 8. I have.

Next, as shown in FIGS. 1 and 2, the upper side frame 4 has two long holes 10 which are long in the vertical direction.
And a pinch roller shaft 11
Are supported so that they can be freely moved up and down and rotatable.
The two pinch roller shafts 11 are spaced apart from each other by a size corresponding to the two transport roller shafts 5. A pinch roller 12 is attached to each of the pinch roller shafts 11. The pinch rollers 12 project a part of their outer periphery downward from a notch 13 formed in the upper paper guide 2, and the transport roller 6 is disposed at a position opposed to the outer peripheral surface.

In addition, a tension shaft 14 having an axis parallel to each pinch roller shaft 11 is rotatably held in the upper side frame 4 at a substantially central position between the two pinch roller shafts 11. Knobs 15 for rotating the tension shaft 14 are provided at both ends of the tension shaft 14.
Has been fixed. At a substantially central portion along the axial length of the tension shaft 14, there is formed a pressure contact state switching portion 16 having a substantially D-shaped cross section including a curved surface portion and a flat surface portion, and a position facing the pressure contact state switching portion 16. The upper surface of a plate-shaped pressure contact spring 17 which is a biasing member is in contact with the upper surface. In addition,
The press-contact state switching portion 16 is in contact with a substantially central portion in the longitudinal direction of the press-contact spring 17, and the lower surfaces of both ends of the press-contact spring 17 are in contact with the upper surfaces of the pinch roller shafts 11.

Here, in a state where the curved surface portion of the press-contact state switching section 16 is in contact with the press-contact spring 17, FIG.
As shown in (1), the pressing spring 17 is bent in a substantially V-shape, and each pinch roller shaft 1 is moved by the pressing spring 17.
1 is urged downward, and each pinch roller 12 is brought into pressure contact with the outer peripheral surface of the transport roller 6. on the other hand,
The flat surface portion of the pressure contact state switching portion 16 is
2, the pressure contact spring 17 is in a substantially horizontal state as shown in FIG. 2, so that the downward urging force of the pressure contact spring 17 does not act on each pinch roller shaft 11 and each pinch roller 12 Are in a pressure-contact released state in which pressure contact with the outer peripheral surface of each transport roller 6 has been released.

Next, the upper paper guide 2, the pinch roller shaft 11, the pinch roller 12, the tension shaft 14, and the pressure spring 17 are unitized as a transport unit 18 as shown in FIG. The transport unit 18 is slidably provided in a horizontal direction between a closed position where the upper part of the lower paper guide 1 is closed and an open position where the upper part of the lower paper guide 1 is opened. In addition,
A holding shaft 19 having an axis parallel to the tension shaft 14 and the pinch roller shaft 11 is fixed to an upper end side of the upper side frame 4. The holding shaft 19 is fitted to the lower side frame 3 on one side. The fitting hole 20 is slidably fitted in the horizontal direction. On the other hand, a holding shaft 21 having an axis parallel to the transport roller shaft 5 is fixed to the lower side frame 3 on one side, and the holding shaft 21 is provided with fitting holes formed in the pair of upper side frames 4 respectively. 22 is slidably fitted. Further, the transport unit 18 is provided on the upper side frame 4 on the near side.
The handle 23 which is gripped to slide is fixed.

Next, on the upper surface of the upper paper guide 2, there is provided a pop-up spring 24 which is a separating member which abuts against the lower surface of each of the pinch roller shafts 11 and urges the pinch roller shafts 11 upward. Installed. In addition,
The urging force of the pop-up spring 24 is set smaller than the urging force of the press-contact spring 17 in the press-contact state.

In such a configuration, when the paper is conveyed, the curved surface of the press-contact state switching unit 16 is brought into contact with the press-contact spring 17 by rotating the tension shaft 14 as shown in FIG. . Then, the press contact spring 17 bends in a substantially V shape, and a downward urging force acts on each pinch roller shaft 11, and each pinch roller 12 is pressed against the outer peripheral surface of each transport roller 6 by this urging force. . Here, the transport roller 6 is rotationally driven by the power from the driving unit, and the paper is transported by the transport roller 6 and the pinch roller 1.
The paper is conveyed along the paper conveyance path in a state where the paper is held between the two.

Next, when the paper being transported is jammed, the flat surface of the press-contact state switching unit 16 is brought into contact with the press-contact spring 17 by rotating the tension shaft 14 as shown in FIG. Let it. Then, the pressure contact spring 17 becomes substantially horizontal and the downward urging force acting on each pinch roller shaft 11 is released, and each pinch roller 12 is released from the pressure contact state on the outer peripheral surface of each transport roller 6. Is done. Further, when the urging force of the pressure contact spring 17 acting on each pinch roller shaft 11 is released, each pinch roller shaft 11 is lifted upward by the urging force of the pop-up spring 24, and each pinch roller 12 It separates from the outer peripheral surface of the transport roller 6.

Accordingly, when the transport unit 18 is slid to the open position where the upper part of the lower paper guide 1 is opened as shown in FIG.
Since the transport roller 6 and the pinch roller 12 do not contact each other, the operation of sliding the transport unit 18 to the open position can be easily performed. Also, when the transport unit 18 is returned to the closed position where the upper part of the lower paper guide 1 is closed after the jam clearance, the transport unit 6 is closed without any contact between the side surfaces of the transport roller 6 and the pinch roller 12. The operation of sliding to the position can be easily performed.

[0017]

According to the present invention, as described above, the upper paper guide which is substantially parallel to the lower paper guide, and the pinch roller which is provided on the lower paper guide and which faces the transport roller which is driven to rotate. A conveying unit in which a pressing member in which the pinch roller is pressed against the outer peripheral surface of the conveying roller and a biasing member which can be switched to a pressure releasing state in which the pressing is released is unitized. In a paper conveying device slidably provided between a closed position for closing the upper part of the guide and an open position for opening the upper part of the lower paper guide, the pinch roller is moved along with switching the urging member to the pressure release state. Since a separating member that moves up to a position separated from the transport roller is attached to the transport unit, the transport unit is opened to a jam position for jam clearance. In the case of sliding, the pinch roller can be raised to a position separated from the conveyance roller by the separation member by switching the urging member to the pressure release state, and therefore, when the conveyance unit is slid to the open position. This prevents contact between the pinch roller and the transport roller, and also prevents the side surfaces of the pinch roller and the transport roller from abutting when returning the transport unit to the closed position after the jam has been cleared. Therefore, there is an effect that the jam processing performed by sliding the transport unit to the open position can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the pressure contact spring is switched to a pressure released state.

FIG. 3 is a plan view showing a state in which the transport unit is slid to an open position.

FIG. 4 is a perspective view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lower paper guide 2 upper paper guide 6 transport roller 12 pinch roller 17 biasing member 18 transport unit 24 separating member

Claims (1)

(57) [Claims] 1. An upper paper guide substantially parallel to a lower paper guide, a pinch roller facing a transport roller provided on the lower paper guide side and driven to rotate, and the pinch roller being a transport roller. A closing unit for closing the upper part of the lower paper guide by providing a transport unit in which a pressure contact state in which the pressure contact state is brought into pressure contact with the outer peripheral surface and a biasing member which can be switched to a pressure release state in which the pressure contact is released. And a paper transport device slidably provided to an open position for opening the upper part of the lower paper guide, wherein the pinch roller is moved away from the transport roller by switching the urging member to the pressure release state. A sheet transport device, wherein a separating member to be lifted is attached to the transport unit.