JPH0315570A - Paper feed mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Regarding a paper feeding mechanism that conveys multi-part continuous form paper, it is possible to convey continuous form paper without causing layer displacement by using pin holding members such as pin belts and sprocket wheels. A movable pin holding unit system is provided with a plurality of pins at equal intervals that engage with feed holes of a multi-part continuous form, and the continuous form is conveyed by movement of the pin holding member. A paper presser that guides the paper at a retaining portion between the pin and the feed hole, and tightening the slack between the multiper 1s with the continuous width form paper on the surface of the paper presser that guides the continuous form paper. The structure is provided with uneven parts to enable smooth and sequential feeding.

[Industrial application field]

The present invention relates to a paper feeding mechanism that transports multi-part continuous form paper.

In recent years, with the increase in the number of page printers such as laser printers, the use of multi-part continuous form paper has increased, and stable paper running with less displacement between paper layers is required.

[Conventional technology]

FIG. 4 shows the structures of various conventional paper feeding mechanisms.

FIG. 4 fa) shows a system using a sprocket wheel, and the paper feed mechanism 1 includes a sprocket wheel (pin holding member) 2 and a paper presser 3.

The sprocket wheel 2 includes a plurality of pins 4 at equal intervals, and is rotated by being driven by a drive system (not shown). The arrangement pinch of each pin 4 is the continuous form paper 1
It is set to engage with the feed hole 100a of No. 00. The paper presser 3 holds the continuous form paper 100 conveyed by the rotation of the sprocket wheel 2 between the pin 4 and the feed hole 100.
It is for guiding the paper at the engagement portion with the sheet a, and is positioned at the paper guiding position shown in the figure and an open position where it is retracted from the paper guiding position. The paper presser 3 has a feed hole 100a.
When the paper is inserted into the pin 4, it is positioned in the open position, and after the paper is inserted, it is closed and positioned in the paper guide position as shown in the figure, and the paper is pressed against the sprocket soto wheel 2 and the sprocket sotobot is placed. The continuous form sheet 100 conveyed by the rotation of the eel 2 is guided.

The conveyed continuous form paper 100 is sent to a printing section (not shown).

In addition, FIG. 4 (bl is a system using a pin helmet, and the paper feeding mechanism 5 is composed of a pin belt (pin holding member) 6 and a paper presser 7. The pin belt 6 has a plurality of pins 8
are provided at equal intervals, and are driven by a drive system (not shown) to travel.

The paper presser 8 plays the same role as the paper presser 3 described above, and is positioned at the illustrated paper guide position and an open position where it is retracted from the paper guide position. The paper presser foot 7 is positioned at the open position when paper is inserted, and after the paper is centrifuged, it is closed and positioned at the paper guide position as shown in the figure, and presses the paper against the pin hel t 6 to allow the pin hel ts 1 and 6 to travel. guides the continuous form paper 100 being conveyed by. Continuous form paper 100 transported
is sent to a printing section (not shown).

[Problem to be solved by the invention]

However, in the conventional method 2, the paper passes through the gap between the paper holder and the pin holding member such as the sprocket wheel or pin belt, so the multi-part paper is squeezed at the entrance of the paper holder. Therefore, the slack that exists between the multi-parts of the paper accumulates at the artificial part of the paper presser as shown in Fig. 5 for the method shown in Fig. 4 fbl, and exceeds the holding force between the sheets, causing interlayer deviation. It was occurring.

The present invention provides a pin belt. It is an object of the present invention to provide a paper feeding mechanism capable of conveying continuous form paper without causing layer displacement using a pin holding member such as a sprocket wheel.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a movable pin holding member having a plurality of pins at equal intervals that engage with feed holes of a multi-part continuous form, and A paper holder guides the continuous form sheet to be conveyed by an engaging portion between the pin and the feed hole, and the continuous form sheet is placed between the multi-parts on the surface of the paper holder that guides the continuous form sheet. The structure is provided with a concave and convex portion so that the bag can be fed sequentially without straining the slack.

[For production]

There is always slack between the multi-parts of paper, and when such continuous form paper is conveyed by a paper feed mechanism, conventionally, the slack accumulates due to the straining at the entrance of the paper presser, and the holding force between the sheets decreases. was exceeded, causing interlayer deviation.

However, in the present invention, the paper guide surface of the paper presser is provided with a concave and convex portion, and the conveyed paper is sequentially fed through the inlet portion of the paper presser without being squeezed due to the relaxation effect of the concave portion. Therefore, the sheets are conveyed with sufficient distance between the sheets, and glabella misalignment is less likely to occur.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a side view showing the structure of the paper feed mechanism of this example. has been done.

The paper guide surface (lower surface in the figure) of the paper presser foot 12 has a convex portion 1.
3 and concave portions 14 are provided alternately. Each of the convex portions l3 and concave portions 14 has an arcuate cross-sectional shape and extends in a direction perpendicular to the paper surface of FIG.

Separating the continuous form 100 is performed by opening the presser foot 12 and positioning it in the open position. Thereafter, the paper presser foot 12 is positioned at the paper guide position shown in FIG. 1, and in this state, by running the pin belt 6, the continuous form paper 10
0 is guided and conveyed by the paper presser l2 and sent to the printing section.

There is always slack between the multi-parts of the paper being conveyed, and conventionally, when the paper is conveyed, interlayer misalignment has occurred due to the accumulation of slack as described above.

However, in the present invention, the uneven portion 15 is provided on the paper guide surface of the paper presser 12, and the paper being conveyed is
The relaxation effect at 4 allows the convex portion 13 to easily enter the concave portion 14.

As a result, as shown in FIG. 2, the conveyed sheets are not squeezed at the entrance of the sheet presser foot 12 and are smoothly fed one after another. Therefore, sheets are conveyed while maintaining sufficient distance between sheets, and interlayer misalignment is less likely to occur.

In the above description, an example has been described in which each of the convex portions l3 and concave portions 14 has an arcuate cross-sectional shape, but these cross-sectional shapes may be as shown in FIG. 3. FIG. 3 ta+ shows the case where the convex part 16 and the concave part 17 each have a trapezoidal cross-sectional shape and extend on a straight line, and FIG. FIG. 3(C) shows a case in which the provided recessed portion l9 having an arcuate cross-sectional shape is shaped like a wave, and FIG. The same effect as described above can be obtained when any of these uneven portions are provided.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent or reduce the misalignment between layers of paper during paper conveyance, which greatly contributes to improving printing accuracy and stable conveyance of paper.

[Brief explanation of drawings]

Fig. 1 is a side view showing the structure of the paper feeding mechanism according to the embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the paper feeding mechanism, Fig. 3
(bl, (C) are explanatory diagrams of various shapes of the guide surface of the paper presser, Fig. 4 (a), fb) are structural explanatory diagrams of various conventional paper feeding mechanisms, and Fig. 5 is a conventional paper feeding mechanism. In the figure, 6 is a pin belt (pin holding member), 8 is a pin, 11 is a paper feed mechanism, 12 is a paper presser, 13, 16, 18.21 are convex parts, 14, 17, 19 .20 is a concave portion, and 15 is an uneven portion. Paper submission V) 41! Structure diagram 2

Claims (1)

[Claims] Multi-part continuous form paper (100) with sprocket holes (10
a movable pin holding member (6) having a plurality of pins (4) at equal intervals that engage with the pin holding member (6);
) The continuous form paper (100) is conveyed by the movement of
a paper presser (12) that guides the continuous form paper (100) at an engaging portion between the pin (4) and the feed hole (100a); A paper feeding mechanism characterized in that an uneven portion (15) is provided to allow the continuous form paper (100) to be sequentially fed without squeezing the slack between the multi-parts.