JPH0764442B2 - Paper feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device used in a printer, a copying machine, or the like.

2. Description of the Related Art Conventionally, by using a single-cut sheet stop plate that forms a gate with a slight gap between it and a set stand, which has a set stand for supporting and stacking a large number of postcards and other single cut sheets. Sheet feeding that aligns the leading edges of the cut sheets, presses the uppermost cut sheet with a pressing body, and brings the paper feed roller into contact with the lowermost cut sheet so that the cut sheets are fed out from the gate one by one from the bottom. There is a device.

Then, the voucher is supplied to the voucher storage portion, but at this time, the operator pushes a large number of vouchers against the voucher stop plate, so that some vouchers are pushed into the gate. As a result, when the paper feed roller is driven, multiple cut sheets are delivered in an overlapping manner, or multiple cut sheets get stuck in the gate and apply an excessive load to the paper feed roller. Causes problems such as the rotation of the.

For this reason, a set table at the bottom of the cut sheet storage unit is vertically movable, and a stopper protruding from below the set table near the gate is fixed to store the cut sheet in the cut sheet storage unit. When pushing, the set stand is pushed up from the upper edge of the stopper, and this stop prevents the single-cut sheet from protruding from the gate.After the single-cut set, the set stand is returned to its original upper position and the upper surface of this set stand The height is kept the same as or higher than the upper edge.

The problem to be solved by the invention is that the set table must be moved every time a single-cut sheet is set, which is a troublesome operation.

Means for Solving the Problems A single-cut sheet storage unit having an upper surface opening having a guide surface for mounting the single-cut sheets in a stacked state, a lid body for opening and closing the upper surface opening of the single-cut sheet storage unit, and the guide surface from below. A sheet feeding roller that protrudes above the lowermost layer and contacts the lowermost sheet, a pressing body that is held by the lid and presses the uppermost sheet, and aligns the leading edge of the sheet and guides the sheet. A single-cut stop plate that forms a gate with a predetermined gap between the surface, a movable shutter that opens and closes the gate, and a connecting member that connects the lid and the shutter to interlock them. To provide.

Therefore, when the lid is closed, the pressing body presses the cut sheet against the lower paper feed roller, and the closing operation of the lid is transmitted to the shutter via the connecting member to retract the shutter from the gate and feed it. By rotating the paper roller, the single-cut sheets are fed one by one from the bottom layer through the gate. Further, by transmitting the opening / closing operation of the lid body to the shutter via the connecting member, the gate is automatically closed by the shutter when the lid body is opened to store the single-cut sheet in the single-cut sheet storage portion. The condition that a single-cut sheet is pushed into the gate is avoided by the shutter, and when the lid is closed, the shutter can be automatically retracted from the gate, and the leaf spring that regulates the rotation position of the lid is also available. Is provided, such a function can be reliably achieved.

Embodiment An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, there is provided a main body 1 of a paper feed cassette which is detachably attached to a housing such as a printer or a copying machine.
The main body 1 is formed with a single-cut storage portion 4 having a guide surface 3 on the bottom on which a plurality of single-cuts 2 such as postcards are stacked. A lid 5 is vertically rotatably held by a support shaft 6 on the opening surface of the single-cut storage portion 4. Also, the main body 1
Includes a paper feed roller 7 having a part of the outer periphery projected from the guide surface 3, and a motor (not shown) for driving the paper feed roller 7.
And are provided. Further, the lid body 5 is provided with a pressing body 9 held at the free end of rotation of the parallelogram link mechanism 8. That is, the parallelogram link mechanism 8 is formed by two parallel links 12 and 13 that are vertically rotatably held on the lid 5 by shafts 10 and 11, respectively.
The pressing body 9 is rotatably held by shafts 14 and 15 at the free ends of rotation of the shafts 2 and 13. It goes without saying that the axes 10, 11, 14 and 15 are located at the corners of the parallelogram. The pressing body 9 has a horizontal pressing surface 16 on the lower surface and is located above the paper feeding roller 7.

Next, in front of the guide surface 3, a front wall 18 having an opening 17 having substantially the same width as that of the single-cut sheet 2 is integrally formed in the lower part, and a single-piece stop plate 19 is fixed inside the front wall 18. It is provided.
A plurality of projecting pieces 21 for forming the gate 20 are formed in the lower part of the cut-sheet stop plate 19 with a predetermined gap with respect to the guide surface 3 and are gradually inclined in the cut-sheet feeding direction as they go downward. ing. The single-cut stop plate 19 has a spot-welded plate 22 in the center of the front surface, and a pressing piece 23 is formed on the plate 22 so as to face the guide surface 3 with a predetermined gap.

The shutter 24 is rotatably held by the shaft 25 on the single-cut stop plate 19. As shown in FIG. 1, the shutter 24 is urged in the clockwise direction by a spring 26, and a projecting piece 27 projecting downward between the gates 20 is formed at one end and an engaging piece 28 is formed at the other end. Has been done. In addition, a guide portion 30 that holds a connecting member 29 that engages with the engaging piece 28 so as to be vertically movable is formed on one side of the single-mark stop plate 19. The upper end of the connecting member 29 is in contact with the ceiling surface of the lid 5. The gap t of the gate 20 is set to the thickness of the thickest cut sheet 2 with some allowance.

Further, as shown in FIG. 2, the front plate of the single-cut stop plate 19
The screw 22 is fixed to the front wall 18 of the main body 1 by a screw 31, and a leaf spring 32 is sandwiched between the two. This leaf spring
32 is a pressing surface 33 for urging the lid 5 in the closing direction, and the lid 5
It has a pressing surface 34 that presses in the opening direction, a support surface 35 that determines the position of the lid 5 in the opening direction, and a bending portion 36 that curves in a U shape.

In such a configuration, the state shown in FIG. 2 is a state in which a large number of cut sheets 2 are stored in the cut sheet storage unit 4 in a stacked state. When the feed roller 7 is rotated in this state, the cut sheet 2 in the lowermost layer is fed out from the gate 20 and is prevented from floating upward by the pressing piece 23 and is sent to the next step. At this time, the contact friction between the lowermost cut sheet 2 and the sheet feeding roller 7 is extremely large, and the friction between the cut sheets 2 is small as compared with this. Therefore, even if the thickness of the cut sheet 2 is smaller than the gap t of the gate 20, the cut sheet 2 in the lowermost layer is separated from the cut sheet 2 above it and is fed out.

Next, when replenishing the single-cut sheet 2 in the single-cut sheet storage unit 4, the lid body is rotated upward. At the initial stage of this rotating operation, the lid 5 receives resistance from the pressing surface 33 of the leaf spring 32. When the lid 5 is rotated by applying a force greater than this resistance, the tip of the lid 5 bends. While flexing 36, it goes over the apex of the boundary between the pressing piece 33 and the pressing piece 34 and contacts the pressing surface 34 and the supporting surface 35 as shown in FIG. In this state, the support surface 35 defines the open position of the lid 5, and the pressing surface 34 resists the pivoting movement of the lid 5 in the closing direction due to the restoring force of the bending portion 36 itself. Therefore, the lid body 5 can be maintained in the open state.

Further, the movement of the lid body 5 in the opening direction causes the connecting member to move.
29 moves upward while the shutter 24 is interlocked by the force of the spring 26. That is, the shutter 24 is the shaft in FIG.
It rotates clockwise around 25 and the protrusion 27 descends. Therefore, even if a large number of cut sheets 2 are stacked and stored in the cut sheet storage unit 4 while being pressed against the cut sheet stop plate 19, the cut sheets 2 are gated.
Not pushed into 20. When the lid 5 is closed, the connecting member 29 is pressed against the ceiling surface of the lid 5 and descends, so that the shutter 24 rotates counterclockwise about the shaft 25 in FIG. The projecting piece 27 of the shutter 24 is displaced upward to open the gate 20.

As described above, since the shutter 24 can be operated in conjunction with the opening / closing operation of the lid body 5, the opening / closing operation of the gate 20 can be simplified.

EFFECTS OF THE INVENTION The present invention is configured as described above, and the opening / closing operation of the lid can be transmitted to the shutter via the connecting member.
This allows the lid to be opened when storing the single-cut in the single-cut storage unit, but the gate can be automatically closed by the shutter when the cover is opened, so that the single-cut can be pushed into the gate. It is possible to avoid the state that is caused by the shutter, and when the lid is closed, the shutter can be automatically retracted from the gate, and therefore,
The gate opening / closing operation can be simplified, and since a leaf spring for restricting the pivotal position of the lid is provided, it is possible to reliably achieve such a function. .

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a front view of a part showing a structure in which a lid and a shutter are interlocked with each other, and FIG. 2 is a side view with a part in section, FIG. FIG. 6 is a side view showing a part of a sectional view of the opening operation of the lid. 2 …… Single sheet, 3 …… Guide surface, 4 …… Single sheet storage, 5 ……
Lid, 7 ... Feeding roller, 9 ... Pressing body, 19 ... Single-cut stop plate, 20 ... Gate, 23 ... Pressing piece, 24 ... Shutter,
29 …… Coupling member, 32 …… Leaf spring, 34 …… Pressing surface, 35 ……
Supporting surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 58-17032 (JP, A) Actual development 56-92631 (JP, U) Actual public 54-26613 (JP, Y2)

Claims (1)

[Claims] Claim: What is claimed is: 1. A single-cut sheet storage section having an upper surface opening having a guide surface for mounting the single-cut sheet in a stacked state, a lid body rotatably held in the upper surface opening of the single-cut sheet storage section, and a lid body. A leaf spring having a pressing surface for urging the lid in the closing direction, a pressing surface for pressing the lid in the opening direction, a support surface for determining the position of the lid in the opening direction, and a bending portion curved in a U shape. A sheet feeding roller protruding from above to the upper part of the guide surface to contact the lowermost cut sheet, a pressing body held by the lid to press and contact the uppermost cut sheet, and a leading edge of the cut sheet. And a slit stop plate that forms a gate with a predetermined gap between the guide surface and the guide surface, a movable shutter that opens and closes the gate, and the lid body and the shutter are connected to each other. A sheet feeding device comprising a connecting member to be interlocked.