JPS60172568A - Paper feed method - Google Patents

Abstract

PURPOSE:To perform the accurate positional determination of apper, by forming a loop to paper and reversely driving a platen to impart vibration to the paper. CONSTITUTION:When a sensor 22 detects a fed sheet 5, a platen drive means rotates a platen 18 to a reverse direction A. When the leading end of the sheet 5 reaches the meshing part of the platen 18 and a pinch roller 19a, said sheet 5 is limited at the leading end thereof without being held between the plate 18 and the pinch roller 19a because of the rotation of the platen 18 to the A-direction. Further, by driving a paper feed roller 7 for an accurate time, a proper loop is formed to the sheet 5. Next, when the driving of the paper feed roller 7 is stopped and the platen 18 is rotated to a positive direction B, vibration is imparted to the paper feed roller 7 and the sheet 5 is fed to the side of a recording head 20 while certainly held between the plate 18 and pinch rollers 19a, 19b.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an improvement in a paper feeding method for an automatic paper feeding device, and in particular, to form a loop in the paper and drive the platen in reverse to vibrate the paper and feed the paper. The present invention relates to a paper feeding method for accurately positioning paper.

[Prior art]

Printing devices in typewriters, printers, and word processors controlled by minicomputers are desired to have automated paper feeding for faster speeds and ease of non-rolling.

Conventionally, such a paper feeding device has been detachable from the recording device, and when the paper feeding device is attached to the recording device, the cut sheets in the paper feeding device are transferred to the paper feeding device equipped with the paper feeding device. The leading edge of the cut sheet comes into contact with the mesh between the stationary platen and the pinch roller in the recording device, preventing its advance, and then the sheet feeding means is driven until the appropriate loop amount is formed. After that, the paper feeding means was stopped, and then the platen in the recording device was driven to convey the cut sheet to the Zolinta side.

However, since both the platen and the pinch roller are cylindrical, the engagement portion between the platen and the pinch roller is the point of contact between the arcs, and the leading edge of the cut sheet is likely to be regulated at exactly the same location. ”It was difficult. I
J7 '15i? Cut sheet tip IX1 with large coefficient
If there is paper waste etc. on the edge surface of the platen, the cut sheet may not slip and be conveyed accurately to the meshing part, which may cause inconveniences such as the inability to accurately convey the cut sheet to the eight recording devices when the platen is driven. was there.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention has been made to eliminate the above-mentioned drawbacks, and is to provide a paper feeding method for an automatic paper feeding device that can accurately feed cut sheets to a recording apparatus.

[Mizonari]

In order to achieve the above object, the present invention provides a paper feeding device equipped with a paper feeding means for feeding paper, a platen and a pinch P-
2: In a recording device with a built-in device, the paper is brought into contact with the meshing portion of the sill tenn and the pinch roller to form a proper loop on the paper, the platen is driven backwards to give vibration to the paper, and then the platen is driven forward to convey the paper. It is characterized by

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 is a schematic view of the paper feed device installed in the recording device. In the figure, 1 is the paper feed device, 2 is the upper paper feed cassette, 3 is the lower paper feed cassette, and 4 is the upper paper feed cassette. The cut sheets stacked on the paper barrel 3 are brought into frictional contact with a first paper feeding roller 6 serving as a paper feeding means. 5 is the lower paper feed cassette 4
The cut sheets, which are stacked on the tray, are brought into frictional contact with a second paper feed roller 7, which is a paper feed means. 8 and 9 are a first paper feed shaft and a second paper feed shaft inside the first paper feed row 26 and the second paper feed row 27, respectively. 17 is a recording device, 18 is a platen, 19a and 19b are pinch rollers, and the cut sheet is conveyed while being brought into frictional contact between the platen 18 and the pinch rollers 19a, 19b. 20 is a recording head, 21
Reference numeral 22 indicates a guide plate for transporting the cut sheet, and 22 a sensor for detecting the presence or absence of the cut sheet.

FIG. 1 shows a state in which the cut sheet 5 is conveyed by the second paper feed roller 7 and is about to pass in front of the sensor 22.

Next, the effect will be explained. Cut sheet 5 is 11 more
When it is fed, it is detected by the sensor 22, and the platen driving means (not shown) rotates the flatten 18 in the reverse direction A based on the signal from the sensor 22. As the conveyance of the cut sheet 5 further progresses, as shown in FIG. 2a, the cut sheet 5
The leading edge of the platen 18 reaches the engagement part between the platen 18 and the pinch roller 19a, but at this time, the platen 18 is rotating in the direction A, so the cut sheet 5 is not pinched between the platen 18 and the pinch roller 198, and the leading edge is regulated. be done.

Further, when paper feeding is continued by driving the second paper feed row 27 for an appropriate time, a proper loop is formed in the cut sheet 5 as shown in FIG. 2b. Next, when the drive of the second paper feed roller 7 is stopped and the flatten 18 is rotated in the forward direction B, the cut sheet 5 is given a stiffness force (
Since a pushing force is exerted in the meshing direction by the repulsive force of the cut sheet, the cut sheet 5 is moved between the platen 18 and the pinch roller 19a as shown in FIG. 2c.

19b, and is conveyed to the recording head 20 side.

In this case, when the tip of the cut sheet 5 reaches the meshing part between the platen 18 and the pinch roller 19a, the platen 18 is rotated in the opposite direction when the ribbon reaches the meshing part between the platen 18 and the pinch roller 19a. The second
Due to the pushing force of the cut sheet 5 by the paper feed roller 7 and the stiffness of the cut sheet 5 itself due to the loop, a cut sheet is formed at the engagement part between the arcs of the platen 18 and the pinch roller 19a, which are made of a rubber member with a large friction coefficient.
Since platen 5 can be precisely regulated, platen 1
When the roller 8 rotates in the supply direction, it reliably engages with the pinch row 219a and can convey the cut sheet 5.

In the embodiment described above, the timing of the reverse rotation of the platen 18 is synchronized with the passing of the leading edge of the cut sheet 5 by the sensor 22. Since there is a small tolerance distance between them, if the tip of the cut sheet 1-5;
2nd pass Ryo, after a while, the reverse of Furo Latin 18 1.
It is also possible to initiate a Q+ drive. This allows for energy savings.

Further, as an example of the summer version of this embodiment, the following paper feeding method can be mentioned. In other words, the tip of the cut sheet is brought into contact with the meshing part between the stationary platen and the pinch roller, the paper feed roller is driven to form an appropriate loop in the cut sheet, the drive of the paper feed roller is stopped, and the platen is then moved. By rotating the cut sheet by a certain amount in the reverse direction, the cut sheet is given one rotational movement, and the leading edge of the cut sheet is accurately regulated by the engagement between the platen and the pinch roller, and the platen is rotated in the forward direction to convey the cut sheet. In this case, the cut sheet is pushed in only by the stiffness of the appropriate loop formed in the cut sheet, and is accurately regulated by the engagement portion between the platen and the pinch roller.

〔effect〕

As described above in detail and specifically, according to the present invention,
When the cut sheet hits the engagement part between the platen and the pinch roller and a proper loop is formed, or after the formation, vibration is applied to the cut sheet by driving the flatten in the opposite direction to the direction in which the cut sheet is conveyed. is,
The leading edge of the cut sheet can be precisely regulated at the engagement part between the arcs of the platen and the pinch roller, which are made of a rubber member with a large coefficient of friction, so when the platen is then driven in the forward direction, the cut sheet will move forward. The platen and the pinch roller are surely engaged and conveyed correctly.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the paper feeding device of this embodiment installed in a recording device.
1 approximately enlarged 19 portrait 1". In the figure, 1...Paper feeder, 4, 5...Cut sheet, 6...
・1st n 1 go it (roller, 7...4j"y 2'
A' Restoration roller, 17...Recording device, 18...
Pin 0 Latin, 19a, 19b...pinch rollers. Figure 2C- @ Figure 2b Figure 2C Old

Claims (3)

[Claims] (1) In a recording device that includes a paper feeding device equipped with a paper feeding means for feeding paper, and a built-in platen and pinch roller; A 4F3 paper method characterized by forming a proper loop, driving the platen backwards to give vibration to the paper, and then driving the platen forward to convey the paper. (2) Drive the paper feeder and just before the paper comes into contact with the engagement part between the platen and the pinch roller, drive the platen backwards to form a proper loop in the paper and apply vibration to the paper, and then the paper feeder 1. A paper feeding method according to Paragraph 1 of the Patent Enclosure, characterized in that the platen is stopped and the platen is moved in sequence. (3) By driving the paper feeding means, forming a proper loop while bringing the paper into contact with the stationary platen and the pinch roller engagement part, then stopping the paper feeding means and driving the platen backwards. 2. The paper feeding method according to claim 1, wherein the platen is sequentially driven after applying vibration to the paper.