JP2549370B2 - Paper feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device that feeds a plurality of cut sheets one by one to a printing unit or the like.

2. Description of the Related Art In this type, as shown in FIG. 15, as shown in FIG. 15, the elevating table 31 on which the cut sheet 30 is placed is sequentially raised so that the uppermost cut sheet 30 is brought into contact with the paper feed roller 32, The rollers 32 are intermittently driven to separate the single-cut sheets 30 one by one and deliver them to, for example, a feed roller 33 on the printer side.

However, it is difficult to match the peripheral speeds of the paper feed roller 32 and the feed roller 33, which causes skew and jam. To prevent this, the paper feed roller 32 must be suddenly stopped when the leading edge of the cut sheet 30 reaches the feed roller 33, which causes a problem that unreasonable force acts on the motor to shorten the life. is there.

Although not known, in order to solve such a problem, a sheet feeding device as shown in FIGS. 7 to 14 has been considered. That is, 1 is a box-shaped single-stock stocker, and a lift table 3 for stacking and mounting a plurality of single-chips 2 having a strong rigidity like a card on the single-stock stocker 1 is a lifting drive unit for lifting and lowering. It is connected to the motor 3a and is provided to be movable up and down. Also,
A guide surface 1b for guiding the discharge of the uppermost cut sheet 2 is formed on the front surface 1a of the cut sheet stocker 1. Further, a sheet feeding motor 4 and a solenoid 5 which is an arm driving unit are fixed to the upper portion of the single-stock stocker 1, and a drive shaft 7 connected to the sheet feeding motor 4 by a belt 6 is rotatably supported. Has been done. A gear 8 is fixed to the drive shaft 7, and a roller arm 9 is rotatably held. A gear 10 meshing with the gear 8, a gear 11 meshing with the gear 10, and a paper feed roller 12 coaxially coupled to the gear 11 are rotatably held by the roller arm 9. The bar 13 attached to the end of the roller arm 9 is connected to the plunger 14 of the solenoid 5.

Next, as shown in FIGS. 8 to 13, a feed roller 15 on the printing machine side is provided on the extension line of the uppermost cut sheet 2, and between the feed roller 15 and the cut sheet stocker 1. At the moment when the leading edge of the cut sheet 2 is detected, a stop signal is output to the drive circuit of the sheet feeding motor 4, and a signal for continuously exciting the solenoid 5 is output to the drive circuit while detecting the presence of the cut sheet 2. A detector 16 is provided.

With such a structure, the operation will be described with reference to the timing chart shown in FIG. 14. As shown in FIG. 8, when the solenoid 5 is in the non-excited state, the roller arm 9 is not excited.
Is positioned below and the paper feed roller 12 contacts the uppermost cut sheet 2. When the sheet feeding motor 4 is driven in this state, the rotation is transmitted to the sheet feeding roller 12 via the gears 8, 10 and 11 and the sheet 2 is cut.
Are sent toward the feed roller 15. As shown in FIG. 9, when the leading edge of the cut sheet 2 reaches the detector 16, the detector 16
When the signal is turned on, the solenoid 5 is excited by this signal and the power supply to the sheet feeding motor 4 is cut off. As a result, as shown in FIG. 10, the plunger 14 is pulled and the roller arm 9 rotates counterclockwise about the drive shaft 7 as a fulcrum.
The paper feed roller 12 separates from the cut sheet 2. Still, 2
Progresses due to inertia as shown in FIGS. 11, 12, and 13. When the trailing edge of the cut sheet 2 passes the detector 16, the detector
16, the solenoid 5 is de-energized by this signal, and the roller arm 9 rotates clockwise around the drive shaft 7 as a fulcrum to bring the paper feed roller 12 into contact with the cut sheet 2, as shown in FIG. Then, the operation of preparing for the next sheet feeding command is repeated.

During this time, the single-cut sheet 2 that has progressed from the single-cut sheet stocker 1 is delivered to the feed roller 15 in the process shown in FIG. 11, but even if the single-cut sheet 2 advances at a speed faster than the peripheral speed of the feed roller 15, it advances due to inertia. When it is delivered to the roller 15, the feed roller 15
It is sent at the speed specified for the peripheral speed. Therefore, it is possible to prevent skew and jam. Further, it is not necessary to stop the feeding motor 4 suddenly, and the life of the feeding motor 4 can be extended. Since the paper feed roller 12 intermittently contacts the single-cut sheet 2, it is possible to continuously rotate the paper feed roller 12.

Problems to be Solved by the Invention And, the paper feeding device shown in FIGS.
In the paper feeding device shown in FIG. 15, it is also necessary to intermittently drive the lifting motor to raise the lift table in order to position the uppermost cut sheet at a certain level. For this reason,
As shown in Fig. 15, the micro switch 34
Actuator 35 is contacted, and micro switch 34 is intermittently operated by the discharging operation of cut sheet 30, and this operation intermittently drives the lift table drive motor (not shown) to raise or lower according to the discharge amount of cut sheet 30. Although the table 31 is raised, the uppermost cut sheet detected by the micro switch 34 due to the warp of the cut sheet 30 and the variation in the thickness in the left-right direction or the front-back direction.
The height of 30 may be different from the height of the cut sheet 30 at the portion of the paper feed roller 32. As a result, when the pressure contact force of the paper feed roller 32 against the cut sheet 30 is insufficient and the paper feed roller 32 slips and the cut sheet 30 cannot be sent, when the press contact force is too strong and the cut sheet 30 overlaps and is sent. In some cases

Further, in the sheet feeding device shown in FIGS. 8 to 13, a micro switch 17 having an actuator 18 that interferes with the roller arm 9 is provided, and the roller arm 9 is changed to a single sheet 2 each time the single sheet 2 is discharged. The micro switch 17 is operated by rotating it by the thickness of one sheet.
Is driven to raise the elevating table 3 little by little. However, since the paper feed roller 12 is separated from the uppermost cut sheet 2, the rotation range of the roller arm 9 is wide. For this reason, the actuator of the micro switch 17 is sent every time one piece of the single-cut sheet 2 is sent.
You'll have to press 18 pretty hard. Therefore, there is a problem that the durability of the micro switch 17 is reduced.

Means for solving the problem A single-stock stocker that accommodates a large number of single-cut sheets in a stacked state,
Rotate a lift table that mounts the cut sheet and is driven by a lift drive unit to move up and down, and feeds the cut sheet one by one in contact with the uppermost cut sheet on the lift table. A vertically movable roller arm that is freely supported and driven by an arm driving unit is provided, and a feed roller is provided at a position separated by a predetermined dimension in the feeding direction of the cut sheet. A detector for detecting the cut sheet is provided between them, and when the detector detects the cut sheet, the paper feed roller is raised to separate the cut sheet from the cut sheet and the detector detects the cut sheet. When there is no sheet, the paper feed roller is lowered to come into contact with the cut sheet, and the detection arm having a pressing surface for pressing the cut sheet is provided on the cut sheet stocker in the vicinity of the feed roller. Independent of the arm The actuator is provided so as to be movable up and down, and has an actuator that interferes with the one-way operation of the detection arm that responds to the feeding of one sheet of the sheet by the sheet feeding roller. A single-cut level detection switch for operating the drive unit is provided.

As a result, the paper feed motor rotates the paper feed roller to send out a single-cut sheet, but when the detector detects the leading edge of the single-cut sheet, the arm drive unit is operated by the detection signal and the roller arm is displaced. And separate the paper feed roller from the cut sheet. After that, the cut sheet proceeds by inertia and is passed to the next process. Therefore, it is possible to prevent skew and jam. Further, there is no need to suddenly stop the paper feeding motor. Furthermore, the detection arm that operates in conjunction with the ejection operation of the single-cut sheet operates the single-cut sheet level detection switch to drive the lifting drive unit to intermittently raise the lift table, but the detection arm operates independently of the roller arm. Since the moving range of the arm corresponds to one sheet, it is possible to reduce the pressure on the actuator of the sheet level detection switch. Further, by providing a single-cut end detection switch having an actuator that interferes with the movement of the detection arm in the other direction, it is possible to detect the state in which the single-cut has run out.

Embodiment An embodiment of the present invention will be described with reference to FIGS. The same parts as those described in FIGS. 7 to 14 are designated by the same reference numerals, and the description thereof will be omitted. A detection arm 19 is rotatably held on the drive shaft 7. The detection arm 19 includes a protrusion 20 located on one side and a paper feed roller 12
And a pressing surface 21 for pressing the cut sheet 2 is formed in the vicinity of. An opening 22 that opens to the pressing surface 21 is formed in the lift table 3. Furthermore, on the upper one side of the single-stock stocker 1,
A single-cut level detection switch 25 having actuators 23, 24 facing the projecting piece 20 and a single-cut end detection switch 26 are provided. One of the single-cut level detection switches 25 and the other single-cut end detection switch 26 are switches that are always OFF. As shown in Table 1, the combination of the detection signals input to the driver (not shown) causes the lifting motor 3a to move. It controls three operations: stop, forward rotation, and reverse rotation.

In such a structure, the cut sheet 2 is discharged by the paper feed roller 12 and the leading end of the cut sheet 2 exceeds the detector 16, which is shown in FIG. 2, in which the solenoid 5 is excited by the detection operation of the detector 16. The roller arm 9 rotates counterclockwise, the paper feed roller 12 separates from the cut sheet 2, and the cut sheet 2 moves toward the feed roller 15 by inertia. In this state, the detection arm 19 presses the cut sheet 2 by the pressing surface 21 and the actuator 23 by the projecting piece 20 to keep the cut level detection switch 25 in the ON state, and the cut end detection switch 26 is OF.
F state. This stops the lifting motor 3a,
The lift 3 also stops. This single-cut level detection switch 25
In the ON state and the OFF state of the cut end detection switch 26, the cut sheet 2 reaches the feed roller 15 as shown in FIG. 3 and is further fed by the feed roller 15 as shown in FIG. But it doesn't change. However, as shown in FIG. 5, when the cut sheet passes through the detection arm 19, the detection arm 19 rotates clockwise about the thickness of one piece of the cut sheet 2 around the drive shaft 7 as a fulcrum, so that the cut sheet level. The detection switch 25 is turned off, and the lifting motor 3a rotates in the forward direction to raise the lifting table 3. When the lift table 3 is raised, the detection arm 19 is pressed by the cut sheet 2 and rotates counterclockwise around the drive shaft 7 as a fulcrum, and the projecting piece 20 pushes the actuator 23 to turn on the cut level detection switch 25. It is done until. At this time, the amount of intermittent raising operation of the lifting table 3 is the thickness of one sheet of the single-cut sheet 2. On the other hand, voucher 2 is the detector
Since it passes through 16, the detection signal of the detector 16 is switched to OFF, the solenoid 5 is switched to the non-excited state, the roller arm 9 is switched clockwise with the support shaft 7 as a fulcrum, and the paper feed roller 12 is cut into two sheets. Contact and prepare for the next single-sheet ejection operation.

In this way, when the lift table 3 is raised by the thickness of one cut sheet every time one cut sheet 2 is discharged, the lift table 3 is eventually released.
The upper cut sheet 2 disappears as shown in FIG. As a result, the detection arm 19 does not receive the resistance of the single-cut sheet 2, so that the detection arm 19 rotates clockwise about the drive shaft 7. At this time, the opening 22 escapes the pressing surface 21 and allows the rotation operation of the detection arm 19. As a result, the single-cut level detection switch 25 is an actuator.
23 is turned off because it is released from the projecting piece 20, and the single-cut end detection switch 26 is turned on because the actuator 24 is pressed by the projecting piece 20 and the lifting motor 3a reverses to lower the lifting table 3. . As a result, it is possible to easily supply the cut sheet 2 to the cut sheet stocker 1.

As described above, the roller arm 9 has a wide range of rotation because the paper feed roller 12 is lifted from the cut sheet each time one cut sheet 2 is discharged, but the detection arm 19 is detected each time one cut sheet 2 is discharged. The range in which is rotated is insignificant, which corresponds to the thickness of one cut sheet. Therefore, the pressure of the detection arm 19 against the actuator 23 of the single-cut level detection switch 25 can be reduced to reduce the amount of bending of the actuator 23, and thus the durability of the actuator 23 can be improved. Further, since the detection arm 19 detects the level of the cut sheet 2 by the pressing surface 21 in the vicinity of the sheet feeding roller 12, the cut sheet 2 is detected.
Even if there is a warp or a difference in the thickness in the front-rear and left-right directions, the pressure of the paper feed roller 12 against the cut sheet 2 can be made uniform, and therefore the pressure contact force against the cut sheet 2 is too weak. As a result, it is possible to prevent the paper feed roller 12 from slipping and to prevent a plurality of cut sheets 2 from being overlapped and fed due to the excessive pressure contact force against the cut sheet 2.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the paper feeding motor rotates the paper feeding roller to send out a single-cut sheet, but when the detector detects the leading edge of the single-cut sheet, it is driven by the detection signal. Part is operated and the roller arm is displaced to separate the paper feed roller from the single-cut sheet, and thereafter, the single-cut sheet can be advanced by inertia and passed to the next process, thus preventing skew and jam. In addition, the life of the paper feeding motor can be extended without the need to stop the feeding motor suddenly. Furthermore, every time one sheet is ejected, the detection arm operates to detect the level of the sheet. Although the switch is activated to raise the lift platform intermittently, the movement range of the detection arm, which operates independently of the roller arm, is so small that it corresponds to one voucher. The amount of flexure can be reduced to improve durability, and the detection arm detects the level of the cut sheet by the pressing surface in the vicinity of the paper feed roller. Even if there is a difference in the pressure, it is possible to make the pressure on the single sheet of the paper feed roller uniform.
Therefore, it is possible to prevent that the pressure contact force against the single-cut sheet is too weak and the paper feed roller slips, and the pressure contact force against the single-cut sheet is too strong to feed multiple cut-sheets in an overlapping manner. By providing the single-cut end detection switch that is interlocked with the operation of the detection arm, it is possible to detect the shortage of the single-cut.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view, and FIGS.
Fig. 6 is a side view showing the feeding operation of a single-cut sheet, Fig. 6 is a side view showing a state in which the single-cut sheet has been cut through the elevating table in section, and Figs. FIG. 7 is a partially cutaway perspective view, FIGS. 8 to 13 are side views showing a single-sheet feeding operation, and FIG. 14 is a timing chart, FIG.
FIG. 15 is a side view showing a conventional example. 1 ... Single-cut stocker, 2 ... Single-cut, 3 ... Elevating table, 3a ... Elevating motor (elevating drive), 4 ... Paper feeding motor, 5 ... Solenoid (arm drive), 9 ... Roller arm, 12 ... Paper feed roller, 16 ... Detector, 19 ... Detection arm, 23 ... Actuator, 24 ... Actuator, 25 ... Single-cut level detection switch, 26 ... Single-cut end detection switch

Claims (2)

(57) [Claims] Claims: 1. A single-stock stocker that accommodates a large number of single-cut sheets in a stacked state. In the feeding direction of the single-cut sheet, there is provided a sheet-feeding roller rotatably supporting the single-cut sheet in contact with the upper-layer single-cut sheet and a vertically movable roller arm driven by an arm driving unit. A feed roller is provided at a position separated by a predetermined dimension, and a detector for detecting the cut sheet is provided between the feed roller and the paper feed roller. When the detector detects the cut sheet, the feed roller is moved. When the detector does not detect the cut sheet, the paper feed roller is lowered to come into contact with the cut sheet so that the cut sheet stocker is in the vicinity of the feed roller. Located at and press the cut sheet A detection arm having a pressing surface is provided so as to be movable up and down independently of the roller arm, and interferes with the one-way operation of the detection arm that responds to the feeding of a single sheet by the paper feed roller. A sheet feeding device provided with a cut sheet level detection switch which has an actuator and operates the elevating / lowering drive unit in response to feeding of one sheet of the cut sheet. 2. An elevating platform which is mounted on a voucher stocker for accommodating a large number of vouchers in a stacked state and which is driven by an elevating drive section, and an uppermost table on the elevating platform. In the feeding direction of the single-cut sheet, there is provided a sheet-feeding roller rotatably supporting the single-cut sheet in contact with the upper-layer single-cut sheet and a vertically movable roller arm driven by an arm driving unit. A feed roller is provided at a position separated by a predetermined dimension, and a detector for detecting the cut sheet is provided between the feed roller and the paper feed roller. When the detector detects the cut sheet, the feed roller is moved. When the detector does not detect the cut sheet, the paper feed roller is lowered to come into contact with the cut sheet so that the cut sheet stocker is in the vicinity of the feed roller. Located at and press the cut sheet A detection arm having a pressing surface is provided so as to be movable up and down independently of the roller arm, and interferes with the one-way operation of the detection arm that responds to the feeding of a single sheet by the paper feed roller. A single-cut end detection having an actuator and a single-cut level detection switch for operating the elevating and lowering drive unit in response to feeding of one of the single cuts, and having an actuator that interferes with the operation of the detection arm in the other direction. A sheet feeding device characterized by having a switch.