JP2547056B2 - Printer paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION [Overview] Concerning a paper feeding mechanism in a single-duplex printer, continuous feeding can be stably performed when continuous paper is used, and stability is improved when a single-cut sheet, especially a vertically long sheet is inserted. In order to do so, the platen, the supply means for supplying the continuous form paper to the platen, the tiltable position and the horizontal position are provided so as to be positionable, and the insert cut sheet and the continuous form paper after printing are guided. In a continuous single-use printer equipped with a guide, a sub-guide is provided, and the sub-guide is provided at the tip of the guide at a position on the extension line of the guide and at a position tilted backward from the position by a predetermined angle. It is configured so that it can be positioned.

[Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding mechanism in a continuous single-use printer.

[Conventional technology]

FIG. 8 is a side view showing a continuous book use state of a conventional continuous / single-purpose printer. In the figure, 1 is a platen, 2 is a supply means, and 3 is a rear guide.

The feeding means 2 is for feeding the continuous form paper and supplying it to the platen 1 when the continuous form paper is used, and in this figure, it is shown that the sprocket wheel 4 is provided. The sprocket wheel 4 has teeth 4a that engage with the feed holes at the side edges of the continuous form paper, and is driven by the drive shaft 5 to rotate and convey the paper.

The rear guide 3 is provided with pins 7 and 8 which engage with a chevron-shaped groove 6 formed on the housing side of the printer. The rear guide 3 has a horizontal position shown in FIG. 8 and an inclined position shown in FIG. Condition)
It is positioned at and. The engagement state of the groove 6 and the pins 7 and 8 at each of these positions is as illustrated. A guide 9 is supported by the rear guide 3 so as to be movable in a direction perpendicular to the plane of the drawing. A pair of guides 9 are provided, and they are used by sliding them to a position for guiding both sides of the processing paper.

When the continuous form paper is used, the continuous form paper is supplied to the platen 1 by the supply means 2 and positioned at the print start position, and the line feed is performed by the supply means 2 and the platen 1 while the print head is being printed.
Print with 10. The sheet discharged after printing passes through the separator 11 and the horizontal guide 9 and is sent to the stack section.

When using a single-cut sheet, the rear guide 3 is positioned at an inclined position as shown in FIG. 9, and the single-cut sheet is set on the guide 9. The set cut sheet slides down on the guide 9 by its own weight and enters between the platen 1 and the pinch roller 12, is conveyed by the platen 1 and is positioned at the print start position, and the leading end is pressed against the platen 1 by the bail roller 13. To be After that, printing is performed while line feed is performed by the platen 1, and the printed paper is ejected onto the stacker 14 that is integrally provided on the rear guide 3.

[Problems to be Solved by the Invention]

However, the conventional printer having the above structure has the following various problems.

(1) When continuous paper is continuously fed, the paper may be peeled off (the peripheral portion of the feed hole may be damaged). This is due to the fact that the feeding speed by the platen is set to be slightly higher than the feeding speed by the feeding means in order to eliminate the slack of the paper, and the wrapping angle of the paper on the platen is large. To solve this problem, it is effective to reduce the wrapping angle. To this end, keep the rear guide in the inclined position even when using continuous form paper so that the ejected paper passes over it. However, it is not preferable because the paper will be broken near the upper end of the rear guide.

(2) The guide cannot be too long because it interferes if it protrudes more than the main body of the device in the horizontal state. Therefore, especially when inserting a vertically long cut sheet, the waist of the sheet is broken and the sheet cannot be smoothly inserted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper feed mechanism for a printer that can stably perform continuous feeding when using continuous form paper, and can improve the stability of a single-cut sheet, especially when inserting vertically long paper. It is a thing.

[Means for solving the problem]

FIG. 1 is a diagram for explaining the principle of the present invention, in which 21 is a sub guide, 1, 2, 9, 10, and 11 are platens, feeding means, guides, print heads, and separators, which are the same as the conventional ones, and print heads. 10 and the separator 11 are added for reference.

The sub guide 21 is supported by the tip 9a of the guide 9 such that it can be positioned at a position indicated by a solid line on the extension line of the guide 9 and a position indicated by a chain line inclined backward (to the right in the drawing) from the position by a predetermined angle. .

Descriptions of other configurations of the same members as those of the conventional art will be omitted.

[Work]

When using the continuous form paper, the guide 9 is positioned at the illustrated inclined position and the sub guide 21 is positioned at the position where the chain line falls. In this case, the continuous paper discharged after printing passes through the separator 11, the guide 9 and the sub guide 21 and is sent to the stack section. As a result, the wrapping angle of the paper is reduced, and continuous feeding can be stably performed. Also,
Due to the presence of the sub guide 21, the paper is not folded when passing over the guide 9.

When using the single-cut sheet, the guide 9 is positioned at the illustrated inclined position and the sub guide 21 is positioned at the position indicated by the solid line. In this case, the guide 9 is substantially lengthened by the amount of the sub-guide 21, and even in the case of vertically long paper, it is possible to stably insert the paper without bending the waist.

Further, by making the guide 9 horizontal while the sub-guide 21 is tilted as shown by the chain line when the apparatus is not in operation, it is possible to prevent the sub-guide 21 from significantly projecting and becoming an obstacle.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 2 is a side view showing a continuous form sheet processing state of a printer to which the present invention is applied, and FIG. 3 is a side view showing the same slip sheet processing state, in which 21 is a sub guide. The members having the same constructions as the conventional ones are designated by the same reference numerals.

The sub guide 21 is supported by the tip of the guide 9 via a support mechanism 22, and is located on the extension line of the guide 9 as shown in FIG.
It is adapted to be positioned at a position shown in FIG. 2 which is tilted rearward from this position.

 Details of the structure and operation of the support mechanism 22 are as follows.

As shown in FIG. 4 (a), the support mechanism 22 has a projection 23 and a locking piece 24 integrally formed at the tip of the guide 9, and as shown in FIG. 4 (b), the sub guide 21. The base portion is provided with a recess 25, an inclined locking piece 26, a hole 27 and a shaft portion 28. The hole 27 is formed so as to straddle the recess 25 and the locking piece 26, and the shaft portion 28 is provided in the central portion of the hole 27 (the base portion of the locking piece 26). The shaft portion 28 is configured by integrally connecting the meniscus shaft 29 and the guide portion 30. The mutual relationship among the meniscus shaft 29 and the guide portion 30, the recess 25, and the locking piece 26 is as shown in the sectional view of FIG. The sub guide 21 is attached to the guide 9 as follows.

At the time of attachment, first, as shown in FIG. 6A, the guide portion 30 of the shaft portion 28 is connected to the projection 23 of the guide 9 and the locking piece 24.
The sub-guide 21 is pushed in in the direction of the arrow by fitting it between the gaps, but the thickness a of the guide portion 30 (see FIG. 5) is set to be slightly smaller than the gap between the projection 23 and the locking piece 24. It is realized because it is done. Then, when the pushing is completed, the guide portion 30 causes the bent portion 31 of the base portion of the locking piece 24.
It engages with the inner circumference (see FIG. 4 (a)). Next, when the sub guide 21 is moved in the direction shown by the arrow in FIG. 6 (b), the half-moon portion 29 engages with the inner circumference of the bent portion 31, and the sub guide 21 becomes rotatable. A sub guide 21 shown by a chain line in FIG. 6 (c) shows a state in which the movement in the arrow direction in FIG. 6 (b) is completed. From this state, sub guide 21
6 is rotated in the direction of the arrow in FIG. 6 (c), the locking piece 26 is locked by the guide 9 as shown in FIG. 7 (a), and the sub guide 21 is positioned in this state. The solid sub-guide 21 in FIG. 6 (c) shows this state. In this state, since the meniscus shaft 29 is engaged with the projection 23, the sub guide 21 does not move to the left in FIG. 7A and come off. The sub guide 21 is positioned at this position when the continuous form paper described later is used. Further, the sub guide 21 is once rotated counterclockwise until it reaches the state of the chain line in FIG. When pushed in, as shown in FIG. 7 (b), the side surface 25a of the recess 25 is bent at the bent portion 3
While being locked to 1, the plane portion 29a of the meniscus shaft 29 is locked to the protrusion 23, and the sub guide 21 is positioned in this state. The sub guide 21 is positioned in this state when using a single-cut sheet described later.

Next, the positioning and usage of the guide 9 and the sub guide 21 when printing is performed using each continuous sheet will be described.

When using continuous paper, as shown in FIG.
Is positioned at an inclined position and the sub guide 21 is positioned at a tilted position. In this case, the continuous paper 100A discharged after printing is the separator 11, the guide 9, the sub guide 2
It passes through 1 and is sent to the stacker section. As a result, the wrapping angle of the paper is reduced, and continuous feeding can be stably performed. Also, due to the presence of the sub guide 21, the guide 9
Paper breaks when passing over are eliminated.

Further, when using a single-cut sheet, as shown in FIG. 3, the guide 9 is positioned at an inclined position and the sub guide 21 is positioned on an extension line of the guide 9. In this case, the guide 9 is substantially lengthened by the amount of the sub-guide 21, and even in the case of vertically long paper, it is possible to stably insert the paper without bending the waist.

If the guide 9 is made horizontal while the sub guide 21 is tilted when the apparatus is not in operation, it is possible to prevent the sub guide from significantly projecting and becoming an obstacle.

〔The invention's effect〕

As described above, according to the present invention, the following various excellent effects can be achieved.

(1) When the continuous guide paper is used, the sub guide is positioned and used at a position tilted from the inclined position guide, so that the wrapping angle of the paper can be reduced and continuous feeding can be stably performed. In addition, the presence of the sub guide can prevent the paper from being folded on the guide.

(2) When the single guide is used, the sub guide is positioned and used on the extension line of the guide at the inclined position, so that the guide becomes substantially longer by the amount of the sub guide,
Even in the case of portrait paper, it is possible to insert the paper stably without bending the waist.

(3) If the guide is horizontal when the sub guide is tilted when the device is not in operation, it is possible to prevent the sub guide from significantly protruding and becoming an obstacle.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a side view showing a continuous paper processing state of the printer of the embodiment of the present invention, and FIG. 3 is a single-cut processing state of the printer of the embodiment of the present invention. 4A and 4B are perspective views showing the details of the sub-guide support mechanism of the embodiment of the present invention, and FIG. 5 is a sectional view showing the structure of the shaft portion of the embodiment of the present invention. 6 (a), (b), and (c) are explanatory views of the sub guide mounting procedure of the embodiment of the present invention, and FIGS. 7 (a) and 7 (b) are positioning of the sub guide of the embodiment of the present invention. FIG. 8 and FIG. 9 are side views showing a continuous-use single-use printer and a continuous-use single-use printer in a conventional continuous / single-use printer, in which 1 is a platen, 2 is a supply means, and 3 is a rear guide. , 9 is a guide, 21 is a sub guide, and 22 is a support mechanism.

Claims (1)

(57) [Claims] 1. A platen (1), a supply means (2) for supplying continuous form paper to the platen (1), and a tiltable position and a horizontal position. A continuous single-use printer provided with a guide (9) for guiding continuous paper is provided with a sub-guide (21), and the sub-guide (21) is attached to the tip of the guide (9). ) And a position on the extension line thereof and a position tilted rearward from the guide (9) by a predetermined angle so as to be positionably supported.