JPS63302081A - Paper feeder - Google Patents

Abstract

PURPOSE:To supply a paper without any slacking, by providing a conjunctional operating member which is operated in conjunction with a position-switching operation of a tractor mechanism to incline a movable guide plate in a rear-up direction when the tractor mechanism is moved downward. CONSTITUTION:In a pull-in operational mode, a movable guide plate 16 can be turned in a rear-down direction by operating a conjunctional operating mem ber 21 in conjunction with a position-switching operation of a tractor mechanism 3, whereby a passage for inserting a paper toward a platen 2 can be broadened to prevent the paper 1 from being caught. In a push-in operational mode, a passage for pushing in the paper can be narrowed by operating the member 21 in conjunction with the position-switching operation of the tractor mechanism 3, and the movable guide plate 16 can be positioned on an extension plane of an upper surface of a tractor. Thus, the paper 1 can be smoothly supplied without any slackening.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a paper feed device used in a printing machine.

2. Description of the Related Art Conventionally, as shown in FIG. 2(a), a platen 2 on which a zigzag-folded sheet 1 is wound, a paper pan 50 for guiding the sheet 1, and a tractor mechanism 3 are provided. 2, the paper 1 is pulled out by the tractor mechanism 3, or the tractor mechanism 3 is rotated about its guide shaft 4 so that the drive shaft 5 descends, as shown in FIG. 2. Description of the Related Art There is a paper feeding device in which a tractor mechanism 3 pushes a paper 1 onto a platen 2 to print. The usage pattern shown in FIG. 2(a) is called a tension usage pattern, and the usage pattern shown in FIG. 2(b) is called a push usage usage pattern.

In addition, as shown in FIGS. 3(a) and 3(b), a partition plate 51 is fixedly provided between the paper pan 50 and the tractor mechanism 3 to partition the paper insertion path into upper and lower parts. As shown in FIG. 3(a), the paper 1 is inserted between the partition plate 51 and the paper pan 50, and in the push mode, it is inserted between the partition plate 51 and the lower outer periphery of the platen 1. There is a paper feed device.

Problems to be Solved by the Invention As described above, the insertion path of the paper 1 changes depending on the tension mode and the push mode. For this purpose, the height of the paper pan 50 is determined depending on the type of use of the tensioner. However, as shown in FIG. 2(b), in the push mode, the distance between the platen 2 and the rear part of the paper pan 50 is too wide, and the fold line 1a of the paper l is between the platen 2 and the tractor mechanism 3. When the paper 1 reaches the center, the paper 1 tends to loosen significantly at this part, and this tends to cause an error in the amount of paper 1 fed between the platen 2 and the printing section. Note that in the pulling mode shown in FIG. 2(a), even if the path for inserting the paper 1 into the platen 2 is wide, the amount of slack at the bottom of the platen 2 is small because the paper 1 is pulled from above the platen 2. .

As shown in FIGS. 3(a) and 3(b), the partition plate 51 can narrow the insertion path for the paper 1, but as shown in FIG. 3(a), it is difficult to ,
The fold line 1a of the paper 1 is caught between the platen 2 and the partition plate 51, and as shown in FIG. It may be caught between. Moreover, there are variations in the height of the partition plate 51 in the vertical direction, and the partition plate 51
As the gap between the top and bottom increases or decreases, the paper 1 may become more likely to get caught.

Means for Solving the Problems A platen facing the printing section, a paper pan facing the lower outer periphery of the platen with a predetermined gap therebetween, and an upper outer peripheral surface and a lower outer peripheral surface of the platen having selective upper surfaces. a movable guide plate extending from the rear of the paper pan toward the tractor mechanism; The movable guide plate has a hinge portion that rotates in the direction, and an interference portion that interferes with the tractor mechanism and the movable guide plate, and is linked to the position switching operation of the tractor mechanism to move the movable guide plate backward during the downward movement of the tractor mechanism. An interlocking member that tilts in the upward direction is provided.

Therefore, in the tension mode, the tractor mechanism is rotated upward so that its upper surface faces the upper outer periphery of the platen, the interlocking member is interlocked with this movement, and the movable guide plate is moved backward and downward. This widens the path for paper insertion into the platen and prevents the paper from getting caught. In the push mode, the tractor mechanism is rotated downward so that its upper surface faces the lower outer periphery of the platen, the interlocking member is interlocked with this movement, and the movable guide plate is rotated rearward and upward using the hinge as a fulcrum. This narrows the paper insertion path and positions the movable guide plate on an extended surface of the upper surface of the tractor, thereby smoothly feeding the paper without loosening it.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1(a) and 1(b). The tractor mechanism 3 includes a guide plate 7. That is, both ends of the guide shaft 4 and the drive shaft 5 are held by a pair of left and right support plates 6, and these support plates 6 are held by bent pieces 8 formed on both sides of the guide plate 7. A pair of left and right side plates 10 that hold the platen 2 along the moving direction of the dot printer head 9, which is a printing section, have a notch 11 that holds both ends of the guide shaft 4, and a recess 12, 13 that has the notch 11 as the center of its radius. is formed. The upper recess 12 holds bearings (not shown) fitted to both ends of the drive shaft 5 in the tension usage mode as shown in FIG. 1(a);
The lower recess 13 holds the bearing of the drive shaft 5 in the push-in mode of use as shown in FIG. 1(b). Further, a paper pan 14 is fixed to the side plate 10 along the lower outer periphery of the platen 2. An opening 15 is formed at the rear of the paper pan 14, and the front edge of a movable guide plate 16 located in this opening 15 It is held by a support shaft 17, which is a hinge part, so as to be able to move up and down. And the movable guide plate 16
The interference part 19 that interferes with the protrusion 18 formed on the guide plate 7
An interlocking member 21 having an interference portion 20 that interferes with the lower surface of the support shaft 22 is rotatably held on a support shaft 22 .

In such a configuration, when selecting the tension usage mode, as shown in FIG. Aim toward the upper outer peripheral surface of platen 2. In this state, the movable guide plate 16 rotates downward due to its own weight, and the protruding piece 18 is supported by the interference part 19 of the interlocking member 21, and is positioned on the extended surface of the guide plate 7 from the rear of the paper pan 14. In this state, the surfaces of the paper pan 14 and the movable guide plate 16 are continuous as if they were formed by one plate, and there is a margin between the platen 2 and the movable guide plate 16, which allows the fold line 1a to be caught. The paper 1 can be fed smoothly without any trouble. Even if there is a margin between the platen 2 and the movable guide plate 16, the paper 1 is pulled upward by the tractor mechanism 3, so that it does not loosen to the extent that it affects the feed amount.

In addition, when selecting the push-in mode of use, while floating the guide shaft 4 above the notch 11, insert the bearing of the drive shaft 5 into the recess 1.
2 and fit into the recess 13, and the guide shaft 4 is fitted deep into the notch 11. This is the usage pattern of the push-in shown in FIG. 1(b). At this time, the guide plate 7 which is a part of the tractor mechanism 3 presses the interference part 20 and rotates the interlocking member 21 clockwise about the support shaft 22, thereby causing the movable guide plate 1
6, the projecting piece 18 is pressed by the interference part 19 and tilts upwardly rearward about the support shaft 17. Therefore, the movable guide plate 16
extends from the edge of the opening 15 of the paper pan 14 onto an extended surface of the upper surface of the tractor mechanism 3.

As a result, the paper 1 is transferred to the platen 2 by the tractor mechanism 3.
However, since the space between the platen 2 and the movable guide plate 16 is narrowed, even if the fold line 1a of the paper 1 reaches this part, the paper 1 will not loosen significantly. Paper 1 is smoothly fed toward platen 2.

Effects of the Invention Since the present invention is configured as described above, in a tensioning mode of use, the interlocking member can be interlocked with the position switching operation of the tractor mechanism, and the movable guide plate can be rotated in the backward downward direction. This can widen the paper insertion path to the platen and prevent the paper from getting caught. In the push mode, the interlocking member is linked to the position switching operation of the tractor mechanism, and the hinge section is The movable guide plate can be rotated backwards and upwards at the fulcrum, narrowing the paper insertion path and positioning the movable guide plate on an extended surface of the top of the tractor.This allows the paper to be fed smoothly without loosening. It has the effect of being able to.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show an embodiment of the present invention. FIG. ) is a side view showing a form of use for pushing with a part cut away, Figures 2(a) and 2(b) show a conventional example, and Figure 2(a) is a side view showing a form of use for pushing with a part cut away. Fig. 2(b) is a side view showing the usage form of push-in, and Fig. 3(a) is a side view showing the usage form of pushing.
)(b) shows another conventional example, FIG. 3(a) is a side view showing the form of use of tension with a part cut away, and FIG. 3(b) shows a partially cut away side view. It is a side view which shows the usage form of pushing in.

Claims (1)

[Claims] A tractor that can freely switch positions, the platen facing the printing section, the paper pan facing the lower outer circumference of the platen with a predetermined gap, and the upper surface selectively facing the upper outer circumferential surface and the lower outer circumferential surface of the platen. a mechanism, a movable guide plate extending from the rear of the paper pan toward the tractor mechanism, and a hinge part that holds the front part of the movable guide plate and rotates the movable guide plate in an upward rearward direction. , an interlocking member having an interference part that interferes with the tractor mechanism and the movable guide plate, and tilting the movable guide plate in an upward rearward direction during the downward movement of the tractor mechanism in conjunction with the position switching operation of the tractor mechanism; A paper feeding device characterized by: