JP2532470B2 - Paper feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device used in a printing machine.

2. Description of the Related Art Conventionally, as shown in FIG. 2 (a), a platen 2 around which a sheet 1 folded in zigzag is wound, a paper pan 50 for guiding the sheet 1, and a tractor mechanism 3 are provided. The paper 1 fed to the paper 2 is pulled out by the tractor mechanism 3, or, as shown in FIG. 2B, the tractor mechanism 3 is rotated so that the guide shaft 4 serves as a fulcrum and the drive shaft 5 descends. There is a paper feeding device that is moved and prints by pressing the paper 1 into the platen 2 by the tractor mechanism 3. The usage pattern of FIG. 2 (a) is called a pulling usage pattern, and the usage pattern of FIG. 2 (b) is called a pushing usage pattern.

Further, as shown in FIGS. 3 (a) and 3 (b), a partition plate 51 for vertically partitioning the paper insertion path is fixedly provided between the paper pan 50 and the tractor mechanism 3, and in a usage mode of tensioning. As shown in FIG. 3 (a), the sheet 1 is inserted between the partition plate 51 and the paper pan 50, and is inserted between the partition plate 51 and the outer periphery of the lower part of the platen 1 in the pressing use mode. There is a paper feeder.

Problems to be Solved by the Invention As described above, the insertion path of the sheet 1 is different between the usage mode of pulling and tensioning and the usage mode of pushing. For this reason, the height of the paper pan 50 is determined according to the usage of the tensioner. However, as shown in FIG. 2 (b), in the pressing operation mode, the space between the platen 2 and the rear part of the paper pan 50 is too wide, and the fold 1 a of the paper 1 causes the platen 2 and the tractor mechanism 3 to be separated. When the space is reached, the paper 1 is slackened greatly at this portion, and thus the error in the feed amount of the paper 1 between the platen 2 and the printing unit is likely to occur. 2A, even if the insertion path of the sheet 1 into the platen 2 is wide, the sheet 1 is pulled from above the platen 2 and thus the platen 2 is pulled.
There is little slack in the lower part of.

As shown in FIGS. 3 (a) and 3 (b), the one having the partition plate 51 can narrow the insertion path of the sheet 1, but as shown in FIG. In
The fold line 1a of the sheet 1 is caught between the platen 2 and the partition plate 51. As shown in FIG. 3 (b), the fold line 1a of the sheet 1 is the paper pan 50 and the partition plate 51 in the pressing operation mode.
May be caught between. In addition, since the height of the partition plate 51 in the vertical direction varies, the upper and lower gaps of the partition plate 51 increase or decrease, so that the paper 1 may be more easily caught.

Means for Solving the Problems A platen facing the printing unit, a paper pan facing a lower outer periphery of the platen with a predetermined gap therebetween, and an upper surface of the upper outer surface and the lower outer peripheral surface of the platen are selectively formed. A position changeable tractor mechanism, a movable guide plate extending from the rear portion of the paper pan toward the tractor mechanism, and a front portion of the movable guide plate, and the movable guide plate is raised rearward. Has a hinge part for rotating in the direction, and an interference part for interfering with the tractor mechanism and the movable guide plate. The movable guide plate is moved backward when the tractor mechanism moves down in conjunction with the position switching operation of the tractor mechanism. An interlocking member that is inclined in the upward direction is provided.

Therefore, in the use mode of pulling and pulling, the tractor mechanism is rotated upward so that the upper surface of the tractor mechanism faces the upper outer periphery of the platen, the interlocking member is interlocked with this operation, and the movable guide plate is lowered backward. In this way, the sheet is prevented from being caught by widening the sheet insertion path to the platen. In the use mode of pushing, the tractor mechanism is rotated downward so that its upper surface is directed to the outer periphery of the lower part of the platen, the interlocking member is interlocked with this operation, and the movable guide plate is rotated backward and upward with the hinge as a fulcrum. Then, the sheet insertion path is narrowed and the movable guide plate is positioned on the extension surface of the upper surface of the tractor, whereby the sheet is smoothly supplied without slack.

Embodiment An embodiment of the present invention will be described with reference to 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 bending pieces 8 formed on both sides of the guide plate 7. A pair of left and right side plates 10 for holding the platen 2 along the moving direction of the dot printer head 9 which is a printing portion, has a notch 11 for holding both ends of the guide shaft 4, and recesses 12, 1 having the notch 11 as a center of radius.
3 and are formed. The upper recess 12 is shown in FIG. 1 (a).
As shown in FIG. 3, the bearings (not shown) fitted to both ends of the drive shaft 5 are held in the usage form of pulling and the lower recessed portion is held.
Numeral 13 holds the bearing of the drive shaft 5 in the use mode of pushing as shown in FIG. 1 (b). Further, a paper pan 14 along the lower periphery of the platen 2 is fixed to the side plate 10, an opening 15 is formed in the rear portion of the paper pan 14, and the front edge of the movable plate guide 16 located in this opening 15 is It is held by a support shaft 17, which is a hinge, so as to be vertically rotatable. An interlocking member 21 having an interference portion 19 that interferes with the protrusion 18 formed on the movable guide plate 16 and an interference portion 20 that interferes with the lower surface of the guide plate 7 is rotatably held by the support shaft 22. .

In such a configuration, when the usage mode of pulling is selected, as shown in FIG. 1 (a), the bearing of the drive shaft 5 is engaged with the upper recess 12 so that the upper surface of the tractor mechanism 3 is secured. Face the upper outer surface of the platen 2. In this state, the movable guide plate 16 is rotated downward by its own weight and the projecting piece 18 is moved by the interlocking member 21.
It is supported by the interference portion 19 of the paper pan 14 and is located on the extension surface of the guide plate 7 from the rear portion of the paper pan 14. Paper pan in this state
The surface is continuous as 14 and the movable guide plate 16 are formed by one plate, and a margin is created between the platen 2 and the movable guide plate 16, which allows the sheet 1 to be caught without catching the fold line 1a. It can be supplied smoothly. Platen 2 and movable guide plate 16
The sheet 1 is pulled upward by the tractor mechanism 3 even if there is a space between the sheet and the sheet, so that the sheet 1 is not loosened enough to affect the feed amount.

Also, when selecting the usage mode of pushing, the guide shaft 4
The bearing of the drive shaft 5 into the recess 12 while floating above the notch 11.
Then, the guide shaft 4 is fitted into the notch 11 by fitting the guide shaft 4 into the recess 13. This is the pressing use mode 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 with the support shaft 22 as the fulcrum, whereby the movable guide plate 16 moves rearward with the support shaft 17 as the fulcrum by the protrusion 18 being pressed by the interference part 19. Incline upwards. Therefore, the movable guide plate 16 extends from the edge of the opening 15 of the paper pan 14 onto the extension surface of the upper surface of the tractor mechanism 3. As a result, the sheet 1 is pushed into the lower outer periphery of the platen 2 by the tractor mechanism 3, but since the space between the platen 2 and the movable guide plate 16 is narrowed, the sheet 1 is placed in this portion.
Even if the fold line 1a reaches, the sheet 1 does not loosen significantly, and the sheet 1 is smoothly fed toward the platen 2.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, in the usage mode of the tensioner, the interlocking member can be interlocked with the position switching operation of the tractor mechanism to rotate the movable guide plate in the rearward downward direction. By doing so, it is possible to widen the paper insertion path to the platen and prevent paper from being caught.In the usage mode of pushing, the interlocking member is interlocked with the position switching operation of the tractor mechanism, and the hinge part is used as a fulcrum. The movable guide plate can be rotated rearward and upward to narrow the paper insertion path, and the movable guide plate can be positioned on the extension surface of the upper surface of the tractor, so that the paper can be smoothly supplied without slack. It has the effect that

[Brief description of drawings]

FIGS. 1 (a) and 1 (b) show an embodiment of the present invention, and FIG. 1 (a) is a side view showing a usage mode of tensioning with a part of the cross section as shown in FIG. 1 (b). ) Is a side view showing a use form of pushing with a part in a cross section, and FIGS. 2 (a) and 2 (b) show a conventional example, and FIG. Fig. 2 (b) is a side view showing a usage pattern of pushing in with a partial cross section, and Figs. 3 (a) and (b) are other conventional examples. FIG. 3 (a) is a side view showing a usage form of pulling with a part in a cross section, and FIG. 3 (b) is a side view showing a usage form of pushing with a part in a cross section. 1 ... Paper, 2 ... Platen, 3 ... Tractor mechanism, 9
...... Dot printer head (printing part), 14 ...... Paper pan, 16 ...... Movable guide plate, 17 ...... Support shaft (hinge part), 1
9,20 ... Interference part, 21 ... Interlocking member

Claims (1)

(57) [Claims] 1. A platen facing a printing section, a paper pan facing a lower outer circumference of the platen with a predetermined gap, and an upper surface selectively directed to an upper outer peripheral surface and a lower outer peripheral surface of the platen. A tractor mechanism with switchable position,
A movable guide plate extending from a rear portion of the paper pan toward the tractor mechanism, a hinge portion that holds a front portion of the movable guide plate to rotate the movable guide plate in an upward rearward direction, and the tractor. It is composed of an interlocking member that has an interference portion that interferes with the mechanism and the movable guide plate, and that interlocks with the position switching operation of the tractor mechanism and that tilts the movable guide plate in the upward rearward direction when the tractor mechanism descends. A paper feeding device characterized by the above.