JPH11263480A - Jam preventive device on stacker delivery mechanism of continuous paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jam preventive device on a stacker delivery mechanism of continuous paper capable of preventing malfunction of a jam sensor of the stacker delivery mechanism caused in accordance with use of comparatively hard continuous paper of seal type continuous paper, etc., with a seal attached free to peel on a surface of a mount, preventing malfunction of a main body device of a printer, etc., rapidly improving operational efficiency and reducing maintenance caused by stopping due to the malfunction. SOLUTION: A stacker delivery mechanism 3 devised to fold continuous paper having scores 202 for each constant interval in a direction orthogonal with the delivery direction zigzag by the scores while detecting paper jamming by a jam sensor 9 arranged at a position facing against it with a normal delivery route of this continuous paper 200 inbetween is constituted by installing a guide member 14 on the jam sensor 9 free to connect and disconnect so that the continuous paper 200 can forcibly pass the inside of a detection range of the jam sensor 9 in accordance with hardness of the continuous paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing jam in a continuous paper feeding mechanism, and more particularly to a device for preventing jam in a printer for printing on relatively hard continuous paper.

[0002]

2. Description of the Related Art Conventionally, a printer that prints on continuous paper having perforations at regular intervals in a direction orthogonal to a feeding direction includes a stacker that can fold the continuous paper zigzag at the perforations after printing. A feed mechanism is provided. In order to detect a paper jam, the stacker feed mechanism has a jam sensor at a position opposed to the normal feed path of the continuous paper, and feeds the continuous paper to a stacker bench disposed below the jam sensor. A folding direction control member is provided so that the folding direction control member can be folded in a predetermined state.

[0006] The principle of detecting a jam of continuous paper by the above-mentioned jam sensor is as shown in FIG. 6, in which detection light 1 emitted from a light emitting element 100 such as a light emitting diode or a semiconductor laser is used.
01 is applied to the side edge of the continuous paper 200 including the sprocket hole 201, and is reflected from the side edge of the continuous paper 200 by the light receiving element 102 set to the optical axis crossing the optical axis of the light emitting element 100. Receives the reflected light 103,
If the intensity of the reflected light 103 changes continuously in a predetermined pattern due to the movement of the sprocket holes 201,..., It is determined that the paper jam is “absent”. Is not moved, that is, it is generally determined that a paper jam is present. Therefore, it is assumed that the normal feed path of the continuous paper 200 passes through the detection range M of the jam sensor indicated by oblique lines in FIG.

[0004] Normally, a continuous paper stacking mechanism of a printer or the like is designed for relatively soft general-purpose continuous paper, that is, the general-purpose continuous paper is folded on the stacker bench by the folding direction control member described above. In this case, the jam sensor is arranged at a height position at which the continuous paper moves along a fixed feed path, and the side edge of the continuous paper is set so as to pass through the detection range M of the jam sensor. I have.

[0005] However, when a relatively hard continuous paper 200 such as a sticker-type continuous paper in which a seal is releasably attached to the surface of the backing paper is continuously printed by a printer, no paper jam actually occurs. Frequently, paper feed and printing are automatically abnormally stopped due to the occurrence of a paper jam in the aforementioned stacker feed mechanism.

[0006]

The inventor has empirically determined that the cause is a malfunction of the jam sensor. That is, when a relatively hard continuous paper such as the above-mentioned seal type continuous paper is fed to the stacker feeding mechanism, every time the paper is folded along the perforation 202 around the normal feeding path A as shown in FIG. The paper passes while being displaced to the left and right, and the feeding path of the continuous paper 200 deviates from the detection range M of the jam sensor, and the continuous paper 200 is not detected by the jam sensor. If the feed path of the continuous paper 200 deviates from the detection range M of the jam sensor, the same signal as when a paper jam actually occurs is output from the jam sensor to control the printer even though the continuous paper 200 is normally fed. To the device,
It is determined that a paper jam has occurred, and the feeding of the continuous paper 200 is stopped. When such a malfunction occurs, it is necessary to spend a great deal of effort and time to recover the malfunction, and the operation efficiency is greatly reduced.

SUMMARY OF THE INVENTION In view of the above situation, the present invention seeks to solve the problem by using a relatively hard continuous paper such as a sticker-type continuous paper in which a seal is releasably attached to the surface of the backing paper. A continuous paper stacker that can prevent malfunction of the jam sensor of the stacker feed mechanism, and thus malfunction of the main unit such as a printer, dramatically improve operation efficiency and reduce maintenance caused by stoppage due to malfunction. An object of the present invention is to provide a jam prevention device in a feeding mechanism.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of forming continuous paper having perforations at regular intervals in a direction perpendicular to the feeding direction by a normal feeding path of the continuous paper. In a stacker feed mechanism configured to fold zigzag at the perforation while detecting a paper jam with a jam sensor disposed at a position facing the sheet sensor, the continuous sheet is connected to the jam sensor according to the hardness of the continuous sheet. A jam prevention device is provided in a continuous paper stacker feed mechanism in which a guide member is detachably attached to the jam sensor so that the jam sensor can be forcibly passed through the detection range. Here, the jam is
This is a state in which the input / output device that uses paper has stopped moving due to a paper jam. In the present invention, a stop caused by a malfunction is included in the concept of jam.

More specifically, the jam sensor has a concave portion for passing the continuous paper, and the guide member is attached so as to protrude into the concave portion. In addition, the present invention is particularly effective in continuous paper in which a seal is releasably attached to the surface of the backing paper.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 to 3 show a laser printer having a continuous paper stacker feed mechanism according to the present invention. In the drawings, reference numeral 1 denotes a developing device, 2 denotes a fixing device, and 3 denotes a stacker feed mechanism.

In printing on the continuous paper 200 in this printer, the unprocessed continuous paper 210 folded at a predetermined supply position is wound up by the tractor 4 and sent to the developing device 1. After transferring the toner to the pattern, the toner is sent to the fixing device 2 to burn the toner, and then processed through the stacker feeding mechanism 3 to be stored in the original folded state on the lower stacker bench 5. Here, reference numeral 211 denotes a post-processing continuous sheet.

The continuous paper 200 has sprocket holes 201,... At regular intervals on both sides along the feed direction, and has perforations 202 at regular intervals in a direction perpendicular to the feed direction. In this embodiment, although not shown, a sticker-type continuous paper in which a sticker is releasably attached to the surface of the mount is used. This sticker type continuous paper 20
0 indicates that the general-purpose continuous paper is relatively soft, while the seal portion is doubled, so that it is relatively hard.
Paper with Therefore, as described above, an unexpected problem occurs in the stacker feed mechanism 3 such as the laser printer designed for general-purpose continuous paper.

Here, the stacker feed mechanism 3 will be described in more detail. The continuous paper 200 guided downward by the guide rollers 6 and 6 in the fixing device 2 is
As shown in FIGS. 1 and 2, the unprocessed continuous paper 210 passes between a pair of guide shafts 8, 8 suspended in parallel by chains 7,. It is structured to be folded and housed in a zigzag along the fold line. When the continuous paper 200 is folded on the stacker bench 5, the continuous paper 200 is displaced in the normal direction of the paper. Therefore, the displacement is suppressed to a minimum by the guide shafts 8. However, in the relatively hard continuous paper 200, the displacement suppressing effect of the guide shafts 8, 8 is poor, and the displacement of the paper in the normal direction is large. FIG. 4 shows a normal feed path A for a relatively soft continuous paper and an actual feed path B for a relatively hard continuous paper sheet 200.

The stacker feed mechanism 3 is provided with a jam sensor 9 for detecting a normal paper jam. The jam sensor 9 is attached to the bracket 11 so that the normal feed path A is located at the center of the continuous paper passage recess 10. The light-emitting element 100 and the light-receiving element 1 are located on the jam sensor 9 at positions sandwiching the passage recess 10.
02 is provided, and one of the holders 12 and 13 is provided in accordance with the measurement principle of the reflection type or the transmission type.
The light emitting element 100 and the light receiving element 102 are incorporated in the
3, the light receiving element 102 is incorporated. In any case, as shown in FIG. 6, there is an effective detection range M in which the passage of the continuous paper 200 can be reliably detected, and the normal feed path A of the continuous paper 200 is set to be substantially at the center of the detection range M. Have been. The position setting of the jam sensor 9 with respect to the normal feeding path A of the continuous paper 200 is visually adjusted so that the continuous paper 200 suspended in a stationary state is positioned at the geometric center of the passage recess 10.

When the continuous paper 200 continuously passes through the stacker feed mechanism 3, the continuous paper 200 is displaced right and left around the normal feed path A in the passage recess 10 of the jam sensor 9, and the continuous paper is moved by the displacement. When the sheet 200 deviates from the effective detection range M, the jam sensor 9 automatically determines that the sheet is jammed and stops the sheet feeding even though the continuous sheet 200 is actually sent normally. When this phenomenon occurs, printing of the continuous paper 200 during printing becomes defective.

Therefore, as shown in FIGS. 2, 5 and 7, according to the principle of measurement of the jam sensor 9, a guide member 14 is inserted into one of the holders 12 or both of the holders 12 and 13 through the recess 10 for passage. The feeding path is corrected so that the continuous paper 200 can forcibly pass through the detection range M of the jam sensor 9. Here, in this embodiment, an L-shaped member is used as the guide member 14, and one plate piece 14A is
And the other plate piece 14B is attached so that the front end projects beyond the lower end of the holder 12 and into the recess 10 for passage. The guide member 14
Is detachably attached to the jam sensor 9 because the guide member 14 may not be necessary in general-purpose continuous paper.
Also, the length of the protrusion into the passage recess 10 can be adjusted according to the hardness of the continuous paper.

FIG. 8 shows guide members 14 and 14 attached to both holders 12 and 13 of the jam sensor 9, respectively.
Is shown, and the guide member 14 is provided with the aforementioned L
A guide piece 14C is curved downward at the end of the plate piece 14B of the letter-shaped member, and the feed path of the continuous paper 200 is limited between the guide pieces 14C, 14C of the two guide members 14, 14. . However, the guide member 14
If the passing range of the continuous paper 200 is made too narrow,
Since the guide member 14 causes a new paper jam, it is preferable to attach the guide member 14 to only one of the holders 12 if possible. For example, in the sticker type continuous paper 200,
It is preferable that the guide member 14 is not provided on the side where the seal is attached.

As can be seen from the above description, the present invention is not limited to the prevention of jams in the stacker feed mechanism 3 of the laser printer.
The present invention can also be applied to another continuous paper transport processing apparatus provided with the stacker feed mechanism 3 having

[0019]

As described above, the jam preventing device in the continuous paper stacker feeding mechanism of the present invention converts continuous paper having perforations at regular intervals in a direction perpendicular to the feeding direction into normal paper. In a stacker feeding mechanism configured to fold zigzag at the perforation while detecting a paper jam with a jam sensor disposed at a position facing the other side of the continuous paper, the continuous paper is A guide member is detachably attached to the jam sensor so as to be able to forcibly pass through the detection range of the jam sensor. Based on the displacement from the normal feed path due to the use of a relatively hard continuous paper, This can prevent the malfunction of the jam sensor and the malfunction of the main unit such as a printer, which can dramatically improve the operation efficiency and reduce the malfunction. Maintenance generated by a stop by is reduced, it can achieve significant cost reduction since defect rate of the continuous paper is reduced.

In the case where the jam sensor has a concave portion for passing the continuous paper and the guide member is mounted so as to protrude into the concave portion, the structure is extremely simple.
Inexpensive configuration. The present invention is particularly effective for relatively hard continuous paper such as a sticker-type continuous paper in which a seal is releasably attached to the surface of the mount.

[Brief description of the drawings]

FIG. 1 is a simplified explanatory view of a laser printer according to an embodiment of the present invention.

FIG. 2 is a partial perspective view illustrating a main part of a stacker feeding mechanism.

FIG. 3 is a partial side view illustrating a positional relationship between a jam sensor and continuous paper.

FIG. 4 is a simplified explanatory diagram illustrating a continuous paper feed path in the stacker feed mechanism.

FIG. 5 is a schematic explanatory view showing a continuous paper feed path when a guide member is provided.

FIG. 6 is a simplified explanatory diagram showing a paper jam detection principle in the jam sensor.

FIG. 7 is a partial perspective view showing a main part of the present invention.

FIG. 8 is a partial perspective view showing a modification of the present invention.

[Explanation of symbols]

 Reference Signs List A Normal feed path B Actual feed path M Effective detection range 1 Developing device 2 Fixing device 3 Stacker feed mechanism 4 Tractor 5 Stacker bench 6 Guide roller 7 Chain 8 Guide shaft 9 Jam sensor 10 Passage recess 11 Bracket 12, 13 Holder 14 guide member 14A plate piece 14B plate piece 14C guide piece 100 light emitting element 101 detection light 102 light receiving element 103 reflected light 200 continuous paper 201 sprocket hole 202 perforation 210 continuous paper before processing 211 continuous paper after processing

Claims (3)

[Claims] 1. A paper jam is detected by a jam sensor in which continuous paper having perforations at regular intervals in a direction orthogonal to the feeding direction is disposed at a position facing the continuous paper with a normal feeding path interposed therebetween. In the stacker feeding mechanism configured to fold in a zigzag manner at the perforation, the jam sensor may be forcibly passed through the detection range of the jam sensor according to the hardness of the continuous paper. A jam prevention device in a continuous paper stacker feeding mechanism, wherein a guide member is detachably attached to the sheet feeding device. 2. The jam prevention device in the continuous paper stacker feeding mechanism according to claim 1, wherein the jam sensor has a concave portion for passing the continuous paper, and the guide member is attached so as to protrude into the concave portion. 3. The jam prevention device in the continuous paper stacker feeding mechanism according to claim 1, wherein the continuous paper is formed by sticking a seal on a surface of a backing paper so as to be peelable.