JPH06246994A - Paper guide device of printer - Google Patents

Abstract

PURPOSE:To smoothly feed label paper even when the label paper is fed in any direction. CONSTITUTION:In a printer having the freely reversibly rotating paper feed roller 6 arranged on the downstream side in a paper feed passage 5, a cut form feed passage 8, the continuous form paper feed passage 9 provided under the cut form feed passage 8, the freely reversibly rotatable tractor 10 at least arranged to the continuous form paper feed passage 9 and a guide plate 13 made of sheet metal partitioning the cut form feed passage 8 and the continuous form paper 9, the hooking of the leading ends of a fed cut form 15 and fed continuous form paper 16 is prevented by the curved part 12 provided to the rear edge of the guide plate 13. When label paper 18 wherein labels are bonded to pasteboard is used as the continuous form paper, an auxiliary guide plate 19 having a curved part 20 at its front edge is selectively engaged with the guide plate 13 and, even when the label paper 18 is returned in a reverse direction, the hooking of the label paper 18 is prevented by the curved part 20 of the auxiliary guide plate 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper guide device for a printer, which selectively supplies cut sheets and continuous paper to a printing section.

[0002]

2. Description of the Related Art First, FIG. 4 shows a conventional example. Reference numeral 1 is a frame, on which a print head 2 and a platen 3 are attached.
Of the paper feeding path 5 that passes through the printing section 4, the paper feeding roller 6 that is arranged on the downstream side of the printing section 4 of the paper feeding path 5 and that can rotate freely, and the paper feeding path 5. A paper feed roller 7 arranged on the upstream side of the printing unit 4, a cut sheet feeding path 8 for feeding cut sheets toward the printing section 4, and a continuous sheet provided below the cut sheet feeding path 8 A continuous paper feeding path 9 for supplying, a tractor 10 attached to the continuous paper feeding path 9, which can be rotated in the forward and reverse directions, a paper feed port 11 located below the paper transporting path 5 and opening, and a tractor 10 side. A guide plate 13 made of sheet metal is provided, which has a curved portion 12 that curves downward from the trailing edge and partitions the single-sheet feeding path 8 and the continuous paper feeding path 9. The guide plate 13 is rotatable and can be fixed at an arbitrary position. In addition, as shown in FIG. 4D, the tractor 10 has a structure in which it is selectively mounted on the downstream side of the paper transport path 5.

Next, the operation will be described. Figure 4 (a)
As shown in FIG. 7, when printing is performed using the single-cut sheet 15, the guide plate 13 is rotated clockwise to bring the pair of paper feed rollers 6 and 7 into contact with each other. The form 15 is supplied to the printing unit 4.

As shown in FIG. 4 (b), when a continuous paper (fanfold paper) having a large number of feed holes formed on both sides is used, the guide plate 13 is rotated counterclockwise to be continuous. The paper feed path 9 is opened, the pair of paper feed rollers 7 are separated from each other, the pair of paper feed rollers 6 are brought into contact with each other, and the paper feed roller 6 and the tractor 10 are driven in the forward direction to feed the continuous paper 16 upward. In this case, as shown in FIG. 4C, the continuous paper 16 may be returned by driving the tractor 10 and the paper feed roller 6 in opposite directions.

Further, as shown in FIG. 4D, when the tractor 10 is positioned downstream of the paper feed roller 6 and mounted on the frame 1 and the continuous paper 17 other than the fanfold paper is used, the guide is also provided. The plate 13 is rotated counterclockwise to separate the pair of paper feed rollers 6 and 7, and the tractor 10 is driven in the positive direction to convey the continuous paper 17. In this case, tension can be applied to the continuous paper 17 by contacting the lower paper feed roller 7 or providing a leaf spring that elastically contacts the continuous paper 17 at the paper feed port 11.

The guide plate 13 guides the cut sheet 15 on the upper surface as shown in FIG. 4 (a) and prevents the continuous paper 16 from floating on the lower surface as shown in FIG. 4 (b). It is not possible to fix the intermediate portion in the width direction of. Therefore, when the guide plate 13 made of synthetic resin is used, it is easy to bend in the width direction due to the stress during molding. Further, as shown in FIG. 4B, in the usage mode in which the tractor 10 is arranged on the downstream side of the paper feed roller 6, in order to prevent the continuous paper 16 from being loosened, the peripheral speed of the paper feed roller 6 is set higher than the peripheral speed of the tractor 10. Since the speed is increased, the continuous paper 16 is tensioned between the tractor 10 and the paper feed roller 6. Therefore, when the guide plate 13 is deformed in the width direction, the continuous paper 16 cannot be brought into flat contact with the platen 3, and the continuous paper 16 vibrates at the time of printing in a portion floated from the platen 3 to cause abnormal noise. Quality is also affected. The difference in peripheral speed between the tractor 10 and the paper feed roller 6 is absorbed by the slip of the paper feed roller 6 on the conveyed continuous paper 16.

As described above, the guide plate 13 made of sheet metal is difficult to bend due to the influence of the widthwise bending of the guide plate 13.
Is used. Therefore, in order to prevent the leading edges of the fed cut sheets 15 and the continuous paper 16 from being caught on the trailing edge of the guide plate 13, the bending portion 1 that is bent downward at the trailing edge of the guide plate 13.
This is the reason why 2 is formed.

[0008]

By the way, FIG. 4 (b)
In the usage pattern shown in (c), there is a user who uses the label paper 18 in which a large number of labels are affixed on the upper surface of a long mount having a large number of feed holes formed on both sides as a continuous paper. In this usage mode, the label paper 18 is curved in a direction in which the upper surface side to which the label is attached is recessed, and this curvature is unlikely to cause the label to peel from the mount. This will be understood in comparison with the case where the upper surface on the label side is curved in the protruding direction.

In such a usage pattern, FIG. 4 (b)
When the label paper 18 is fed in the forward direction as shown in (1), since the curved portion 12 is formed at the rear edge of the guide plate 13, the leading edge of the label does not get caught on the rear edge of the guide plate 13. Further, since the angle between the lower surface of the guide plate 13 and the label sheet is an acute angle, the label will not be caught on the front edge of the guide plate 13 even when the leading edge of the label passes under the front edge of the guide plate 13. That is, the label does not come off from the mount.

However, as shown in FIG. 4C, when the label paper 18 is returned to the left, the label paper 18 and the guide plate 1
Since the angle formed by the front edge of 3 with the front edge increases to a nearly right angle, the label is caught on the front edge of the guide plate 13. In addition, as described above, the paper feed roller 6
Since the peripheral speed is higher, the label paper 18 is loosened between the tractor 10 and the paper feed roller 6. Due to this slack, the label paper 18 may be curved in the direction in which the upper surface of the label paper is protruded. Therefore, when the label paper 18 receives resistance from the front edge of the guide plate 13, the label paper 18 may be very easily peeled off from the mount paper.

This can be solved by forming a curved portion on the front edge of the guide plate 13 as well.
In order to prevent the label from receiving resistance from the front edge of the guide plate 13 regardless of whether the label paper 18 is fed in the forward direction or in the reverse direction, it should be formed on the front edge of the guide plate 13. The curved portion is useless unless it has a semicircular shape.
As a result, bending becomes extremely difficult and the cost of the guide plate 13 increases. Further, if the guide plate 13 having the curved portion formed on the front edge is provided as standard equipment while ignoring the cost, there is a problem that the user who does not use the label paper 18 is economically burdened.

[0012]

SUMMARY OF THE INVENTION According to the present invention, a forward / reverse free paper feed roller disposed downstream of a printing unit in a paper transport path, and a single sheet feeding for guiding a single sheet toward the printing unit. A paper path, a continuous paper feed path that is provided below the single-cut paper feed path and guides the continuous paper toward the printing unit, and is rotatable at least in the continuous paper feed path. A tractor and a guide plate made of sheet metal having a curved portion that curves downward from the rear edge on the tractor side at the front edge and partitioning between the cut sheet feeding path and the continuous paper feeding path are provided. In the printer,
An auxiliary guide plate is provided that has a curved portion that curves upward toward the front edge of the guide plate on the printing portion side, and that faces the lower surface of the guide plate, and both sides of the guide plate and the auxiliary guide plate are provided. An engaging portion is formed on the facing portion so as to be engageable with and disengageable from each other.

[0013]

According to the present invention, the curved portion formed at the rear edge of the guide plate can prevent the leading edge of the cut sheet and continuous paper fed to the printing section from being caught. Also, for users who use label paper with a label attached to the mount as continuous paper, it is extremely easy to connect the guide plate and the optional auxiliary guide plate by engaging the engaging parts. This makes it possible to return the label paper in the opposite direction.
The curved portion formed at the front edge of the auxiliary guide plate can guide the label sheet smoothly below the guide plate. In addition, the curved portion of the front edge of the auxiliary guide plate has a simple shape in which the guide plate is opposed to the upper surface of the auxiliary guide plate, so that the curved portion is simply warped upward.
The auxiliary guide plate can be easily manufactured. In addition, since the user who does not use the label paper does not need to have the auxiliary guide plate as a standard equipment, the economical burden on the user can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The same parts as those in the conventional example described with reference to FIG. As shown in FIG. 2, an auxiliary guide plate 19 made of a metal plate is provided to face the lower surface of the guide plate 13. A curved portion 20 is formed at the front edge of the auxiliary guide plate 19 on the printing portion 4 side. The guide plate 13 has side plates 21 bent downward on both sides, and a support shaft 14 rotatably supported by the frame 1 is erected on the side plates 21. In this embodiment, for example, a toggle spring (not shown) and a stopper (not shown) are provided on the frame 1, and the hook of the toggle spring is engaged with the small hole 22 formed in the side plate 21. The guide plate 13 is biased upward and downward with the dead point as a boundary, and the pin 23 standing on the side plate 21 is brought into contact with the stopper of the frame 1 to determine the stationary position of the guide plate 13. It is a thing. The guide plate 13 shown in FIG. 4 is similar to the guide plate 13 shown in FIG. 2 in principle, and the support shaft 14 is the center of rotation.

The engaging portions 2 are provided on both sides of the guide plate 13.
4, 25, 26 are formed. In addition, the auxiliary guide plate 1
9 has side plates 27 that are bent upward on both sides, and these side plates 27 are formed with engaging portions 28, 29, 30 which are engaged with any of the engaging portions 24, 25, 26. . Information board 1
The engaging portion 24 of No. 3 is formed in the shape of a hole penetrating in the vertical direction, the engaging portion 25 is formed in the shape of a notch, and the engaging portion 26 is formed at the edge of the curved portion 12. The engaging portions 28 and 29 of the auxiliary guide plate 19 are formed in an L shape that projects upward and bends forward, and the engaging portion 30 has a tongue shape that bends inward from the lower edge of the side plate 27. It is formed in a shape.

In such a structure, the auxiliary guide plate 19 is positioned on the front side of the guide plate 13 as shown in FIG. 3 (a), and the guide plate 13 is engaged as shown in FIG. 3 (b). Part 2
4 and 25 are engaged with the engaging portions 28 and 29 of the auxiliary guide plate 19, and subsequently, as shown in FIG.
Slide forward (to the right). As a result, the bent portions at the tips of the engaging portions 28 and 29 are supported on the upper surface of the guide plate 13. Next, as shown in FIG. 3D, the tongue-shaped engaging portion 30 is bent upward and brought into contact with the engaging portion 26 (the lower edge of the curved portion 20) of the guide plate 13 so that the auxiliary guide plate is formed. It blocks the movement of 19 toward the front side.

In this way, the guide plate 13 and the auxiliary guide plate 19 are
The state in which the is attached is shown in FIG. As shown in FIG. 1A, when printing is performed using the single-cut sheet 15, the guide plate 13 is rotated in the clockwise direction to bring the pair of paper feed rollers 6 and 7 into contact with each other. The cut sheet 15 is supplied to the printing unit 4 by the steps 6 and 7.

As shown in FIG. 1 (b), when a continuous paper (fanfold paper) having a large number of feed holes formed on both sides is used, the guide plate 13 is rotated counterclockwise to be continuous. The paper feed path 9 is opened, the pair of paper feed rollers 7 are separated from each other, the pair of paper feed rollers 6 are brought into contact with each other, and the paper feed roller 6 and the tractor 10 are driven in the forward direction to feed the continuous paper 16 upward. In this case, as shown in FIG. 1C, the continuous paper 16 may be returned by driving the tractor 10 and the paper feed roller 6 in opposite directions.

As described above, in the usage pattern shown in FIGS. 1 (b) and 1 (c), the label paper 1 formed by attaching the label to the mount paper.
The case where 8 is used as continuous paper will be described. Figure 1
As shown in (b), when the label paper 18 is transported in the forward direction (rightward), the curving portion 12 formed at the rear edge of the guide plate 13 causes the mount and the tip of the label attached thereon. Can be prevented from being caught. As shown in FIG. 1C, when the label paper 18 is returned in the reverse direction, the curving portion 20 formed at the front edge of the auxiliary guide plate 19 allows the mount and the label to be smoothly moved below the guide plate 13. I can guide you.

As described above, for a user who uses the label paper 18 having the label attached to the mount as a continuous paper, the engaging portions 24, 25, 26 of the guide plate 13 and the optional auxiliary guide plate 19 are provided. By engaging the engaging portions 28, 29, 30 of the guide plate 13 and the auxiliary guide plate 19
And can be combined very easily.

A curved portion 20 at the front edge of the auxiliary guide plate 19 is also provided.
The guide plate 13 is opposed to the upper surface of the guide plate 13 so that the guide plate 13 has a simple shape that is bent upward.
Can be easily manufactured. Moreover, the label paper 18
Since the user who does not use the auxiliary guide plate 19 does not need to be equipped with the auxiliary guide plate 19 as standard equipment, the economical burden on the user can be reduced.

The paper feed port 11 is not always essential. In this case, the tractor 10 need only be attached to the continuous paper feed path 9 and need not be attached to the downstream side of the paper transport path 5.

[0023]

As described above, according to the present invention, a curved portion which bends downward is formed at the rear edge of a guide plate made of a sheet metal for partitioning the sheet feeding path and the continuous paper feeding path. An auxiliary guide plate that has a curved portion that curves upward toward the front edge of the printed portion of the plate and that faces the lower surface of the guide plate is provided. Since the engaging portion that is freely engaged is formed, it is possible to prevent the leading edge of the cut sheet and continuous paper fed to the printing section from being caught by the curved portion formed at the rear edge of the guide plate. For users who use label paper with a label on the backing paper in addition to continuous paper,
By engaging the engaging portions of the guide plate and the optional auxiliary guide plate, the two can be connected very easily, so that when the label paper is returned in the opposite direction, the front of the auxiliary guide plate The curved portion formed at the edge allows the label sheet to be smoothly guided to the lower side of the guide plate, and the curved portion at the front edge of the auxiliary guide plate simply faces upward because the guide plate faces the upper surface thereof. It is easy to manufacture the auxiliary guide plate because it has a simple curved shape, and it is economical for the user who does not use label paper because the auxiliary guide plate does not need to be equipped as standard equipment. It has the effect of reducing the burden.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a vertical sectional side view showing a state in which a single-cut sheet is used, and FIG. 1B is a vertical sectional side view showing a state in which continuous paper is conveyed in a forward direction. (C) is a vertical cross-sectional side view showing a state in which continuous paper is conveyed in the reverse direction, and (d) is a vertical cross-sectional side view showing a state in which another continuous paper is used.

FIG. 2 is an exploded perspective view showing a mounting structure of a guide plate and an auxiliary guide plate.

FIG. 3 is a vertical cross-sectional side view showing an assembly sequence of an auxiliary guide plate with respect to the guide plate.

4A and 4B show a conventional example, in which FIG. 4A is a vertical sectional side view showing a state in which a single-cut sheet is used, FIG. 4B is a vertical sectional side view showing a state in which continuous paper is conveyed in a forward direction, and FIG. FIG. 6A is a vertical cross-sectional side view showing a state in which continuous paper is conveyed in the reverse direction, and FIG.

[Explanation of symbols]

 4 Printing Section 5 Paper Conveying Path 6 Paper Feeding Roller 8 Single Sheet Feeding Path 9 Continuous Paper Feeding Path 10 Tractor 12 Curved Section 13 Guide Plate 15 Single Sheet 16, 18 Continuous Paper 19 Auxiliary Guide Plate 20 Curved Section 24-26 Engagement Part 28-30 engaging part

Front Page Continuation (72) Inventor Shinichi Koyanagi 570 Ohito, Ohito-cho, Takata-gun, Shizuoka Prefecture Tokyo Electric Co., Ltd. Ohito Plant

Claims (1)

[Claims] 1. A forward / reverse free paper feed roller arranged on the downstream side of a printing unit in a paper conveyance path, a single-sheet feeding path for guiding a single sheet toward the printing section, and a single sheet feeding roller. A continuous paper feed path that is provided below the paper path and guides the continuous paper toward the printing section, a forward and reverse rotatable tractor disposed at least in the continuous paper feed path, and a rear side of the tractor side. A printer provided with a guide plate made of sheet metal that has a curved portion that curves downward from an edge and separates the cut sheet feeding path and the continuous paper feeding path from each other, in the printer side of the guide plate. An auxiliary guide plate facing the lower surface of the guide plate having a curved portion that curves upward toward the front edge of the guide plate, and the guide plates and the auxiliary guide plate are engaged with each other on opposite sides of the guide plate. A sheet guide device for a printer, characterized in that an engaging portion is formed which is detachably engaged.