JPH0540242U - Printer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a printing apparatus capable of discriminating between manual paper feeding and automatic paper feeding by one paper detecting means. [Constitution] After the half-moon roller 23 rotates its peripheral surface by a distance a, the printing paper 24 is sent out from a paper cassette 25. Each of the paper feed rollers conveys the fed printing paper 24 along a paper conveyance path provided with the print head 21. When the manual paper feed is performed, the manual paper is detected by the paper detection sensor 22 before the half-moon roller 23 rotates by the distance a, so the rotation of the half-moon roller 23 is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printing device.

[0002]

[Prior Art]

 Conventionally, as disclosed in Japanese Unexamined Patent Publication No. 61-41570, a printing apparatus provided with an automatic paper feeding device and capable of manual paper feeding has a position where only paper fed by manual feeding can be detected. Was equipped with paper detection means. When paper is set in the manual feed, paper feeding from the automatic paper feeder is stopped and manual feeding is prioritized.

Further, in order to detect the position of the fed paper, for example, the leading end or the end, another position paper detecting means is provided.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned printing apparatus, the paper detecting means is required at two places, that is, the paper detecting means for detecting only the manually fed paper and the paper detecting means for detecting the position of the fed paper. There was a problem that it became expensive.

Further, the paper detection means can only detect the position of the fed paper at one place, and if the paper is manually fed, the papers are overlapped and fed, so that a printing error occurs. have done.

The present invention has been made to solve the above-mentioned problems, and provides a printing apparatus capable of discriminating between manual paper feeding and automatic paper feeding by a single paper detecting means. With the goal.

[0007]

In order to achieve this object, the printing apparatus of the present invention is always separated from the paper, and is rotated by a predetermined angle to come into contact with the paper and feed the paper from the paper storage unit. A half-moon roller, at least one set of conveyance rollers for conveying the fed-out paper along a paper conveyance path equipped with a print head, and a paper detection sensor provided in the middle of the paper conveyance path. , The half-moon roller is rotated at the same time as the half-moon roller, and the half-moon roller and the half-moon roller and the manual-sheet feed roller are capable of transporting the manual sheet to the paper detection sensor until the half-moon roller rotates by the predetermined angle. If the paper detection sensor detects the paper before the half-moon roller contacts the paper after starting the rotation at the same time, it is determined that the manual paper has been fed. And a control means for stopping the rotation of the meniscal low la.

[0008]

[Action]

 In the printing apparatus of the present invention having the above configuration, after the half-moon roller rotates by a predetermined angle, the paper is sent out from the paper storage unit. At least one set of conveying rollers conveys the fed-out sheet along a sheet conveying path including a print head. When manual feeding is performed, the control unit stops the rotation of the half-moon roller because the paper detection sensor detects the manual sheet before the half-moon roller rotates by the predetermined angle.

[0009]

【Example】

 Embodiments embodying the present invention will be described below with reference to the drawings.

First, the configuration of the printing apparatus according to this embodiment will be described with reference to FIG.

The printing paper 24 is stored in the paper cassette 25. The printing paper 24 is sent out from the paper cassette 25 by the half-moon roller 23, and is fed by the first paper feed roller 34 and the first auxiliary roller 35. It is configured to be conveyed along 31. Further, the printing paper 24 is conveyed by the second paper feed roller 26 and the second auxiliary roller 27, the paper ejection roller 28 and the auxiliary paper ejection roller 29 along the platen 32 and the paper ejection tray 33, and ejected.

A print head 21 is provided to face the platen 32, and a paper detection sensor 22 is provided between the print head 21 and the second auxiliary roller 27. The paper detection sensor 22 is provided at a position separated from the second auxiliary roller 27 by b. Further, a manual feed guide 30 is provided on the upstream side of the second auxiliary roller 27.

Next, the electrical configuration will be described with reference to FIG.

An interface 1 (hereinafter referred to as I / F), an image memory 3, a half-moon roller driving device 4 for driving the half-moon roller 23, a paper detection sensor 22, a print head 21, and an operation switch 8 are connected to the CPU 2 as a control device. Has been done.

Next, the operation will be described with reference to the flowchart of FIG.

First, normal automatic paper feeding will be described.

When data is externally input from the I / F 1 (step S 1, hereinafter simply referred to as S 1 and the same applies to other steps), this data is expanded into a print pattern by the CPU 2, and the image memory 3 (S2). When the printable image patterns are aligned in the image memory 3 (S3), the first paper feed roller 34 and the second paper feed roller 26 are rotated (S4), and the print paper 24 is fed toward the print head 21. ..

On the other hand, the half-moon roller 23 starts rotating at the same time as the rotation of the first paper feeding roller 34 and the second paper feeding roller 26 (S5). The half-moon roller 23 starts rotating from the position in contact with the printing paper when its outer peripheral surface rotates by a, and this distance a is longer than the above-mentioned distance b. That is, since the half-moon roller 23 is not in contact with the printing paper 36 due to the flat portion, the half-moon roller 23 idles by the distance a on the outer circumference. As shown in FIG. 2, after the half-moon roller 23 has rotated by a 1 (S7), the half-moon roller 23 starts contacting with the printing paper 24, and the friction causes the printing paper 24 placed on the uppermost surface of the paper cassette 25 to be removed. It is moved toward the first paper feed roller 34 and is removed from the paper cassette 25.

The printing paper 24 is conveyed to the first paper feeding roller 34 along the paper feeding guide 31, and when the printing paper 24 reaches the first paper feeding roller 34, the printing paper 24 is rotated by the first paper feeding roller 34. The paper feeding operation becomes possible. At this point, the half-moon roller 23 rotates exactly once and then stops (S9, S10), but the half-moon roller 23 faces a flat surface so that it does not contact the printing paper 24. The rotation of the paper roller 34 does not hinder the paper feeding.

Further, the print paper 24 reaches the second paper feed roller 26 by the first paper feed roller 34, and is then fed and fed by the second paper feed roller 26. As shown in FIG. 3, the printing paper 24 fed by the second auxiliary roller 27 is detected by blocking the bottom of the paper detection sensor 22 (S11). It is stored as the tip (S12). Since the distance between the paper detection sensor 22 and the print head 21 is measured in advance, if the leading edge of the print paper 24 is known, the print paper 24 is fed along the platen 32 to a printable position (S13). , Printing is started (S14).

As printing is continued, the printing paper 24 is fed by the second paper feed roller 26 and the paper ejection roller 28, and as shown in FIG. 4, the trailing edge of the printing paper 24 is the second paper feed. The roller 26 is removed and the paper detection sensor 22 is crossed. This time point is stored as the trailing edge of the printing paper 36. Since the position where the trailing edge of the printing paper 36 intersects with the printing head 21 as well as the leading edge can be known, the printing operation is stopped and the paper ejection operation is performed at the position immediately before the interference, and the printing paper 36 is ejected to the paper ejection tray. The paper is discharged to 33.

Next, manual paper feeding will be described.

The print sheet 37 by manual feeding is set along the manual feed guide 37 toward the print head 21, but is sandwiched between both the second paper feed roller 26 and the second auxiliary roller 27. They come into contact with each other, stop, and are arranged as shown in Fig. 5.

Thereafter, as in the case of the above-described automatic paper feeding, data is input from the outside, and the half-moon roller 23 starts rotating.

The paper detection sensor 22 which is a photo interrupter constantly detects the presence or absence of paper (S6), but as shown in FIG. 6, the manually fed printing paper 37 is separated from the second paper feed roller 26 by b. The paper is fed to a position where the paper detection sensor 22 is blocked, and the CPU 2 can determine that the paper is manually fed here (S7). That is, at this time, the half-moon roller 23 rotates by b on the outer circumference, but since this is shorter than the rotation distance a until it comes into contact with the printing paper 24, the printing paper 24 is not removed from the paper cassette 25 at all. Is. At this point, the rotation of the half-moon roller 23 is stopped (S16), so that the paper feeding from the paper cassette 25 can be stopped.

Next, as shown in FIG. 7, the half-moon roller 23 returns to the original home position again, so that the half-moon roller 23 reversely rotates by b and is stopped (S 17), during which the printing paper 37 is ready for printing. Paper is fed to the head 21 by the second paper feed roller 26 (S13). Printing is possible from here, and the printing of the print pattern of the image memory 3 is started (S14).

The subsequent operation is the same as the above-described automatic paper feeding.

As is clear from the above description, according to the printing apparatus of the present embodiment, the single paper detection sensor 22 can distinguish between manual paper feeding and automatic paper feeding. The leading edge and trailing edge of the paper can be detected. Therefore, an inexpensive printing device can be provided.

It should be noted that the present invention is not limited to the above-described embodiments, and can be implemented with various modifications without departing from the scope of the invention.

[0030]

[Effect of the device]

 As is clear from the above description, according to the printing apparatus of the present invention, it is possible to discriminate between manual paper feeding and automatic paper feeding with one paper detection sensor. Therefore, an inexpensive printing device can be provided. Since the leading edge and the trailing edge of the paper can be detected, it is possible to provide an inexpensive printing device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration.

FIG. 2 is an explanatory diagram of automatic printing of the printing apparatus according to the present exemplary embodiment.

FIG. 3 is an explanatory diagram at the time of automatic sheet feeding.

FIG. 4 is an explanatory diagram at the time of automatic sheet feeding.

FIG. 5 is an explanatory diagram of manual paper feeding.

FIG. 6 is an explanatory diagram of manual paper feeding.

FIG. 7 is an explanatory diagram of manual paper feeding.

FIG. 8 is a flowchart showing a flow of operations.

[Explanation of symbols]

 2 CPU 21 print head 22 paper detection sensor 23 half-moon roller 24 printing paper 25 paper cassette 26 second paper feed roller 27 second auxiliary roller 28 paper ejection roller 29 paper ejection auxiliary roller 30 manual feed guide 31 paper feed guide 32 platen 33 paper ejection Tray 34 First paper feed roller 35 First auxiliary roller 37 Printing paper

Claims (1)

[Scope of utility model registration request] 1. A half-moon roller, which is always separated from the paper and which comes into contact with the paper after being rotated by a predetermined angle and feeds the paper out of the paper storage unit; and a print head for the fed paper. At least one set of conveyance rollers that convey along the sheet conveyance path, a paper detection sensor provided in the middle of the sheet conveyance path, and the half-moon roller are rotated at the same time until the half-moon roller rotates by the predetermined angle. In the meantime, the manual paper feed roller capable of carrying the manual paper to the paper detection sensor, and the half-moon roller and the manual paper feed roller are simultaneously started to rotate, and then the paper is fed before the half-moon roller contacts the paper. When the detection sensor detects a sheet, it is determined that a manual sheet has been fed, and a control means for stopping the rotation of the half-moon roller. That the printing device.