JPH06144612A - Paper feeding of automatic paper feeding device - Google Patents

Abstract

PURPOSE:To provide a paper feeding method of an automatic paper feeding device capable of certainly separating sheets one by one, certainly preventing occurrence of jam in a paper feeding process and shortening a printing cycle. CONSTITUTION:It to be an automatic paper feeding device having a paper feeding passage 16 connecting a sheet storage part 10 in which a large number of sheets 9 are accumulated and a printing part 2 to each other, a paper feeding roller 14 to feed the sheets 9 of the sheet storage part 10, a separation means 15 to separate the sheets 9 fed from this paper feeding roller 14 one by one and a sheet carrier part 3 to deliver the sheets 9 fed from the paper feeding roller 14 to the printing part 2. Within the period of time when the sheets 9 reach the sheet carrier part 3 from the sheet storage part 10, the paper feeding roller 14 is rotated at speed lower than ordinary speed, and after the sheets 9 reach the sheet carrier part 3, this sheet carrier part is rotated at the ordinary speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding method for an automatic paper feeding device for feeding paper to a printer, a facsimile, a copying machine or the like.

[0002]

2. Description of the Related Art First, a conventional example is shown in FIG. Reference numeral 1 is a housing of a printer, in which a printing unit 2 and a paper transport unit 3 are provided.
And are provided. The printing unit 2 is a motor (not shown)
And a print head 5 mounted on a carriage (not shown) that is reciprocally driven along the axial direction of the platen 4. Further, the paper transport unit 3 is
It comprises the platen 4 and a plurality of pressing rollers 7 protruding from the paper pan 6 and pressed against the platen 4.

Further, a paper storage portion 10 for storing a large number of paper sheets 9 is provided at the rear portion of the housing 1. The sheet storage unit 10 has a pressing plate 13 which is urged upward by a spring 11 and rotatably held by a support shaft 12. A paper feed roller 14 that contacts the paper 9 stacked on the pressing plate 13 is rotatably provided above the paper storage unit 10, and both ends of the paper 9 are separated at the front end of the paper storage unit 10 as separating means. A separating claw 15 for pressing the corner is provided. Here, the frictional force between the paper feed roller 14 and the paper 9 is set to a value higher than the frictional force between the paper 9.
Further, a paper feed passage 16 that connects the paper storage unit 10 and the paper transport unit 3 and a manual guide plate 17 that hangs from the upper portion of the housing 1 toward the lower portion of the platen 4 are provided. ing.

Next, the operation will be described. Paper feed roller 1
When 4 is driven in the clockwise direction, the uppermost sheet 9 on the pressing plate 13 is dragged by the sheet feeding roller 14, but the leading edge is pressed by the separating claw 15, so that the progress is blocked, as shown in FIG. Bend upwards. Further, when the paper feed roller 14 rotates, the paper 9 advances to the paper feed passage 16 while removing the leading edge of the paper 9 from the separating claw 15 due to the strength of its own waist, and the platen 4
To reach the bottom of. When the paper sensor 8 detects the arrival of the paper 9, the platen 4 is driven clockwise. That is, the paper 9 delivered by the paper feed roller 14 is delivered to the print head 5 by the platen 4 and the pressing roller 7.

Next, as described in Japanese Patent Application Laid-Open No. 3-162335, a pressure stack for stacking a large number of paper sheets and a separating member are provided in a paper feed stacker, and the uppermost paper sheet on the pressure plate is fed. There is a proposal of "a sheet separating and feeding method and a printer device thereof" in which sheets which are pressed against a sheet roller and fed out by a sheet feeding roller are separated one by one by a separating member and supplied to a platen. In this proposal, the paper feed roller is rotated at a low speed in the separation process in which the paper feed roller is rotated and the paper is separated by the separation member, so that the paper is stably separated. This is done for the purpose of shortening the paper feeding time by rotating the paper at a high speed.

[0006]

In the automatic sheet feeder shown in FIG. 6, the sheet 9 is separated by the separating claw 15, but the leading edge of the sheet 9 is separated by the friction between the uppermost sheet 9 and the next sheet 9. The sheet 9 of the next layer stopped by the separation claw 15 may be dragged. That is, even if the sheets 9 are prevented from overlapping on the downstream side of the separating claw 15, the sheet 9 of the next layer may be curved and float up on the upstream side of the separating claw 15. In this case, the uppermost paper sheet 9 is sent out along the floating next paper sheet 9 and deviates from the regular paper feed path. On the other hand, conventionally, the conveyance speed of the sheet 9 by the platen 4 and the paper feed roller 14 is increased in order to increase the printing speed.
When the paper is conveyed at a high speed in the conveying process from the separating claw 15 to the platen 4, the leading end of the paper 9 collides with the manual guide plate 17, and when the manual guide plate 17 is not provided, the leading end of the paper 9 is The platen 4 may come off the extension line of the tangent line of the lower outer periphery and collide with the outer peripheral surface of the platen 4. This collision prevents the paper from advancing and causes a jam. Also,
This collision also causes a problem that the leading edge of the sheet 9 is crushed.
In FIG. 6, the paper feed passage 16 is formed by one guide plate 16a, but even when two guide plates 16a are opposed to each other, the paper 9 whose conveyance direction is deviated is guided at a high speed by the guide plate 1a.
When the sheet 9 is conveyed between 6a, the sheet 9 receives a strong conveying force until the sheet 9 returns to the guide plate 16a in parallel, so that the sheet 9 is bent between the two guide plates 16a, which causes a jam.

In the invention disclosed in Japanese Patent Laid-Open No. 3-162335, the sheet feeding roller is rotated at a low speed until the sheet is separated, so that the sheet separating operation can be stabilized, but the platen after that can be stabilized. Since the paper is conveyed at a high speed in the feeding process, there is a cause of a jam in the feeding process to the platen as described above.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a paper feed path connecting a paper accommodating portion in which a large number of papers are stacked and a printing portion, and a paper feeding roller for feeding the papers in the paper accommodating portion. In an automatic paper feeder having a separating means for separating the papers fed from a paper feed roller one by one, and a paper transport unit for delivering the papers fed from the paper feed roller to the printing unit, The paper feed roller is rotated at a low speed during the period when the paper reaches the paper transport unit from the paper storage unit, and the paper transport unit is rotated at a high speed after the paper reaches the paper transport unit.

[0009]

The sheet feeding roller is rotated at a low speed until the sheet reaches the sheet conveying section, so that the sheet separating operation by the separating unit is stably performed, and further, the path of the leading end of the sheet passing through the separating unit is set. Even if the sheet deviates from the regular path, the sheet is conveyed at a low speed between the separating unit and the sheet conveying unit, so that the sheet is advanced while conforming to the sheet feeding path to prevent the occurrence of a jam, and It is possible to prevent the tip from being crushed. Furthermore, the printing cycle can be shortened by rotating the paper transport unit at high speed after the paper reaches the paper transport unit.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 shows the configuration of the printer. Since the structure of the mechanical portion is the same as that of the conventional example described in FIG. 6, the same reference numerals are used and the description thereof is omitted.

Next, FIG. 2 shows an electronic circuit. A ROM 18 in which program data is written, a RAM 19 in which data is temporarily written, a CPU 20, and an I / O port 21 are connected by a bus line. The input unit of the I / O port 21 is connected to the paper sensor 8 and an operation unit 22 having various operation keys (not shown) and a display unit (not shown) for displaying various operations. A motor driver 24 for driving the motor 23 and a clutch driver 26 for driving the electromagnetic clutch 25 are connected to the output section. The platen 4 is connected to the motor 23, and the paper feed roller 14 is connected to the motor 23 via an electromagnetic clutch 25. Therefore, when the motor 23 is driven, the platen 4 rotates, but even when the motor 23 is being driven, unless the electromagnetic clutch 25 is turned on, the sheet feeding roller 14 is turned on.
Does not rotate.

Next, the paper feeding method will be described with reference to the graph shown in FIG. 3 and the flowchart shown in FIG. The sheet feeding operation is started by turning on the power source. First, the CPU 20 determines whether or not there is a sheet feeding signal. This paper feed signal is selectively input by key input from the operation unit 22, but may be input from the host computer. Further, the setting of the auto sheet feed mode is also made by a key input from the operation unit 22. When the sheet feed signal is input and the automatic sheet feed mode is set, the motor driver 24 drives the motor 23 at a low speed according to a command from the CPU 20. Therefore, platen 4
Rotates at a low speed, and by turning on the electromagnetic clutch 25, the paper feed roller 14 rotates at a low speed. When the paper 9 reaches the lower part of the platen 4, the paper sensor 8 is turned on at the time A shown in FIG. The steps up to this point are the separation step, and the subsequent steps are the paper feed step. When the paper sensor 8 is turned on, the motor driver 24 drives the motor 23 at high speed according to a command from the CPU 20. As a result, the platen 4 rotates at high speed, and the paper 9 is fed to the front surface of the print head 5. In this paper feeding process, the electromagnetic clutch 25 is maintained in the off state, so that the paper feeding roller 14 does not rotate.

Even if the paper feed signal is input, if the automatic sheet feed mode is not set, that is, if the mode for manually feeding the paper 9 along the manual feed guide plate 17 is selected. Is the motor driver 24 is CP
The motor 23 is driven at high speed by the command of U20. That is, in the case of a manual error, the sheet 9 inserted toward the lower part of the platen 4 is rapidly supplied to the front surface of the print head 5 by the platen 4 rotating at a high speed. And the motor 2
3 is stopped at the time when the paper conveyance end signal is output.
This paper transport end signal is sent by the other paper sensors to the paper 9
May be obtained by detecting the arrival position of the sheet sensor, or the timer may be operated at the time when the detection signal of the sheet sensor 8 is output, and the sheet conveyance end signal may be obtained at the time point when the detection signal is output.

As described above, by rotating the paper feed roller 14 at a low speed until the paper 9 reaches the paper transport unit 3, the separation action of the paper 9 by the separation claw 15 can be stably performed. Further, even if the path of the leading edge of the sheet 9 passing through the separating claw 15 deviates upward from the regular path, the sheet 9 can be conveyed at a low speed between the separating claw 15 and the sheet conveying section 3. As a result, it is possible to prevent the occurrence of jam by advancing the paper 9 while accommodating it in the paper feed passage 16 and to prevent the leading end of the paper 9 from colliding with the manual guide plate 17 at high speed. As a result, the leading edge of the sheet 9 is not crushed. Further, after the paper 9 reaches the paper transport unit 3, the print cycle can be shortened by rotating the paper transport unit 3 at high speed.

Since the motor 23 is driven from the stopped state, the conveyance speed of the paper 9 in FIG. 3 changes linearly and reaches a constant speed until the paper 9 is detected by the paper sensor 8. Although the sheet 9 is conveyed at a constant speed, as shown in FIG. 5, the conveying speed of the sheet 9 may be gradually increased in the separating step. Even in this case, the sheet 9 that has passed through the separating claw 15 can be gently guided to the sheet feeding path 16, so that it is possible to achieve the same purpose as that of the above-described embodiment.

[0016]

As described above, the present invention is an automatic paper feeder which separates the paper fed from the paper feed roller one by one by the separating means and transfers the paper to the printing unit by the paper conveying unit. Since the paper feed roller is rotated at a low speed during the period when the sheet arrives at the sheet transporting section from the sheet storage section, the separating operation of the sheet by the separating section is stably performed, and further the sheet passes through the separating section. Even if the path of the leading edge of the paper deviates from the normal path, the paper is transported at a low speed between the separating means and the paper transport unit, so that the paper can be advanced while conforming to the paper feed path to prevent the occurrence of jams. In addition, the leading edge of the paper can be prevented from being crushed, and the paper transport section is rotated at a high speed after the paper reaches the paper transport section, which shortens the printing cycle. It has the effect of, or the like can.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an electronic circuit.

FIG. 3 is a graph showing a change in sheet conveyance speed.

FIG. 4 is a flowchart showing a paper feeding operation.

FIG. 5 shows a modified example and is a graph showing a change in the sheet conveyance speed.

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

 2 Printing Section 3 Paper Transport Section 9 Paper 10 Paper Storage Section 14 Paper Feeding Roller 15 Separation Means 16 Paper Feeding Path

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[Procedure amendment]

[Submission date] January 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a paper feed path connecting a paper accommodating portion in which a large number of papers are stacked and a printing portion, and a paper feeding roller for feeding the papers in the paper accommodating portion. In an automatic paper feeder having a separating means for separating the papers fed from a paper feed roller one by one, and a paper transport unit for delivering the papers fed from the paper feed roller to the printing unit, During the period in which the paper reaches the paper transport unit from the paper storage unit, the paper feed roller is set to a speed lower than the normal speed.
The sheet is rotated at a high speed, and after the sheet reaches the sheet conveying section, the sheet conveying section is rotated at a normal speed .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Operation] Paper feed roller until the paper reaches the paper transport section
Is rotated at a lower speed than the normal speed to stably perform the separating action of the sheet by the separating unit, and even if the path of the leading edge of the sheet passing through the separating unit is deviated from the regular route, the separating unit is separated. By conveying the sheet at a low speed between the sheet conveying section and the sheet conveying section, it is possible to prevent the occurrence of a jam by advancing the sheet while conforming to the sheet feeding path and to prevent the tip of the sheet from being crushed .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Next, FIG. 2 shows an electronic circuit. A ROM 18 in which program data is written, a RAM 19 in which data is temporarily written, a CPU 20, and an I / O port 21 are connected by a bus line. The input unit of the I / O port 21 is connected to the paper sensor 8 and an operation unit 22 having various operation keys (not shown) and a display unit (not shown) for displaying various operations. , A motor driver 24 for driving the motor 23 ,
A clutch driver 26 that drives the nical clutch 25 is connected. The platen 4 is connected to the motor 23, and the paper feed roller 14 is connected to the motor 23 via a mechanical clutch 25 . Therefore, when the motor 23 is driven, the platen 4 rotates, but the motor 23
There paper feed roller 14 as long as not to turn on the mechanical clutch 25 even during driving is not rotated.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Next, the paper feeding method will be described with reference to the graph shown in FIG. 3 and the flowchart shown in FIG. The sheet feeding operation is started by turning on the power source. First, the CPU 20 determines whether or not there is a sheet feeding signal. This paper feed signal is selectively input by key input from the operation unit 22, but may be input from the host computer. Further, the setting of the auto sheet feed mode is also made by a key input from the operation unit 22. When the sheet feed signal is input and the automatic sheet feed mode is set, the motor driver 24 drives the motor 23 at a speed lower than the normal speed according to a command from the CPU 20. Therefore, the platen 4 rotates at a speed lower than the normal speed, and by turning on the mechanical clutch 25, the paper feed roller 14 rotates at a speed lower than the normal speed . When the paper 9 reaches the lower part of the platen 4, the paper sensor 8 is turned on at the time A shown in FIG. The steps up to this point are the separation step, and the subsequent steps are the paper feed step. When the sheet sensor 8 is turned on, the motor driver 24 to drive the motor 23 at a normal speed in accordance with a command CPU 20. As a result, the platen 4 rotates at a normal speed, and the paper 9 is fed to the front surface of the print head 5. In this paper feeding process, the mechanical clutch
Since 25 is maintained in the off state, the paper feed roller 14 does not rotate.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

Even if the paper feed signal is input, if the automatic sheet feed mode is not set, that is, if the mode for manually feeding the paper 9 along the manual feed guide plate 17 is selected. Is the motor driver 24 is CP
The motor 23 is driven at a normal speed according to a command from U20. That is, in the case of a manual error, the sheet 9 inserted toward the lower part of the platen 4 is promptly supplied to the front surface of the print head 5 by the platen 4 rotating at a normal speed .
Then, the motor 23 is stopped at the time point when the sheet conveyance end signal is output. This paper conveyance end signal may be obtained by detecting the arrival position of the paper 9 by another paper sensor, or a timer is activated at the time when the detection signal of the paper sensor 8 is output, and the time is up. You may make it obtain a paper conveyance completion signal at the time.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

As described above, until the paper 9 reaches the paper transport unit 3, the paper feed roller 14 is moved at a lower speed than the normal speed.
In by rotating the separation claw 15 a separating action of the sheet 9 can be stably performed by further even path of the leading end of the sheet 9 to pass through the separation claw 15 is deviated upwardly from the path of normal The paper 9 can be transported at a low speed between the separation claw 15 and the paper transport unit 3.
It is possible to prevent the occurrence of jam by advancing the paper 9 while conforming to the paper feed path 16 and to prevent the leading end of the paper 9 from colliding with the manual guide plate 17 at high speed.
As a result, the leading edge of the sheet 9 is not crushed .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016]

As described above, the present invention is an automatic paper feeder which separates the paper fed from the paper feed roller one by one by the separating means and transfers the paper to the printing unit by the paper conveying unit. During the period from the paper storage unit to the paper transport unit, the paper feed roller is rotated at a speed lower than the normal speed.
Since the sheet is rotated at a degree, the separating action of the sheet by the separating unit is stably performed, and even if the path of the leading edge of the sheet passing through the separating unit is deviated from the regular route, the separating unit and the sheet conveying unit are separated. between by conveying the sheet at a low speed, having with is allowed to proceed while condition the paper in the paper feed passage to prevent the occurrence of a jam, the advantage of being able to prevent the leading end of the sheet collapse.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Claims] 1. A paper feed path connecting a paper storage unit in which a large number of papers are stacked and a printing unit, a paper feed roller for feeding the paper in the paper storage unit, and a paper feed from the paper feed roller. In an automatic paper feeding device having a separating means for separating paper sheets one by one and a paper transporting portion for delivering the paper fed from the paper feeding roller to the printing portion, the paper is fed from the paper storing portion. An automatic paper feeding device characterized in that the paper feed roller is rotated at a low speed during a period when the paper reaches the paper transport unit, and the paper transport unit is rotated at a high speed after the paper reaches the paper transport unit. Paper feeding method.