JP2529792Y2 - Printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printing device.

[Prior Art] FIGS. 4 and 6 show two typical examples of a printing apparatus for sending continuous paper (fanfold paper) between a print head and a platen by a tractor and printing. here,
FIG. 4 shows a schematic configuration of a printer of a pushing tractor system, and FIG. 6 shows a schematic configuration of a printer of a tension tractor system.

In these figures, 1 is a cylindrical platen,
Reference numeral 2 denotes a print head disposed opposite to the platen 1. The print head 2 is supported by a pair of guide shafts 4 and 5 via a carrier 3 so as to be movable in the longitudinal direction of the platen 1 (in a direction perpendicular to the plane of the drawing). On the other hand, a continuous paper guide member 11 is provided along the circumference of the platen 1 on the upstream side of the print head 2 (specifically, on the upstream side in the continuous paper feed direction (arrow F direction) in FIGS. 4 and 6). And downstream from the guide member 11 (for more details,
4 and 6, a paper presser 21 is provided for pressing the continuous paper against the platen 1 in the continuous paper feed direction (downstream of arrow F). Here, the continuous paper guide member
Reference numeral 11 is provided between the paper pan 6 and the platen 1. Normally, the leading end portion 12 of the continuous paper guide member 11 is in contact with or close to the upper part of the paper presser 21 so as to reliably guide the continuous paper. The base end of the paper presser 21 is fixed to the base 7 via a set screw or the like.

The tractor 9 is provided on the upstream side of the print head 2 in the press tractor type printer shown in FIG. 4, while the tractor 9 is provided on the downstream side in the tension tractor type printer shown in FIG. Have been. 4 and 6, reference numeral 8 denotes a bail roller.

Thus, the continuous paper P fed and urged in the direction of arrow F by the tractor 9 is sent between the print head 2 and the platen 1 via the continuous paper guide member 11 and the paper presser 21, and is printed by the head 2. After that, the ink is discharged through the bail roller 8 and the like. At this time, the continuous paper P is pressed against the platen 1 by the continuous paper guide member 11 to remove slack, and the paper presser 21 prevents the floating, so that printing can be performed smoothly.

[Problem to be Solved by the Invention] In the above-described printer, there is a case where the continuous paper P is reversely fed in the direction of arrow R. At this time, as shown in FIG. Paper guide member
It may not be able to be sent because it is caught on the tip 12 of 11,
A disadvantage arises in that the printing device cannot be fully utilized.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a printing apparatus that can feed a continuous sheet in a reverse direction without being hindered by a continuous sheet guide member.

Means for Solving the Problems The present invention has a platen and a print head disposed opposite to the platen, and on the upstream side of the print head,
A continuous paper guide member is provided along the platen, and a paper presser for pressing the continuous paper against the platen at the upper side is in contact with or close to the leading end of the continuous paper guide member and downstream of the guide member. In the printing device, above the paper presser, the tip of the continuous paper guide member is pushed by the bent portion of the continuous paper when the continuous paper is fed backward, and is allowed to elastically deform and move in a direction away from the platen. An escape portion is provided so that the continuous paper can be fed back without being hindered by the continuous paper guide member.

[Operation] In the present invention, when the continuous paper is fed backward, even if the bent portion of the continuous paper is caught on the leading end of the continuous paper guide member, the leading end of the guide member is pushed by the bent portion of the continuous paper. It is elastically deformed and moves away from the platen.
Therefore, the continuous paper can be fed backward without being hindered by the guide member.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a main part of a printing apparatus according to the present embodiment.
This corresponds to FIG. 5 described above.

The platen 1, print head 2, carrier, guide shaft, paper pan 6, base, bail roller, tractor, etc. of this printing apparatus are the same as those of the conventional printing apparatus (FIGS. 4 and 6). , Are partially omitted or simplified.

Here, in the printing apparatus, when the continuous paper is fed in the reverse direction above the paper presser 21, the leading end portion 12 of the continuous paper guide member 11 is pushed by the bent portion of the continuous paper to be elastically deformed and moved away from the platen 1. The continuous paper can be fed back without being hindered by the continuous paper guide member 11. Specifically, the relief portion 22 of the paper presser 21 is formed by denting a side surface 23 of the paper presser 21 facing the platen 1.

The continuous paper guide member 11 and the paper presser 21 are formed of a thin plate-like elastic material such as a stainless steel material or a plastic film. Further, as shown in FIG. 3, a plurality of sets (three sets in the present embodiment) of the continuous paper guide member 11 and the escape portion 22 of the paper presser 21 are provided so that even continuous papers having various widths can be smoothly fed backward. It is provided at predetermined intervals in the longitudinal direction of the platen 1.

 Next, the operation will be described.

When the continuous paper P is reversely fed in the direction of arrow R, even if the bent portion of the continuous paper is caught on the distal end 12 of the continuous paper guide member 11, as shown in FIG. The continuous paper is pushed by the bent portion and elastically deformed, and moves in a direction away from the platen 1. Therefore, the continuous paper P
Can be smoothly fed in the direction of arrow R without being hindered by the guide member 11.

Therefore, according to this embodiment, the top end portion 12 of the continuous paper guide member 11 is elastically deformed by the bent portion of the continuous paper and is moved away from the platen 1 above the paper presser 21 when the continuous paper is fed backward. An escape portion 22 that allows movement is provided, so that the continuous paper can be fed backward without being hindered by the continuous paper guide member 11, so that the continuous paper P can be reversed without being hindered by the continuous paper guide member 11. Can be sent.

In addition, since the continuous paper guide member 11 and the escape portion 22 are provided at predetermined intervals in the longitudinal direction of the platen 1 (three in this embodiment), even a continuous paper having various widths can be smoothly reversely fed. .

Since the escape portion 22 is provided by using the paper presser 21, the printing device is not complicated and large.

According to the present invention, the leading end of the continuous paper guide member is elastically deformed and moved away from the platen above the paper presser by the bent portion of the continuous paper when the continuous paper is fed backward. The continuous paper can be fed backward without being hindered by the continuous paper guide member, and the continuous paper can be fed back without being hindered by the continuous paper guide member.

[Brief description of the drawings]

1 to 3 are views showing an embodiment of the present invention. FIG. 1 is a front view showing a main part, FIG. 2 is a view showing a state in which continuous paper is fed in reverse, and FIG. It is a perspective view which shows a part. 4 to 6 are views showing a conventional printing apparatus, FIG. 4 is a front view showing a schematic configuration of a printing apparatus of a pushing tractor system, FIG. 5 is a view showing a state in which continuous paper is fed backward, FIG. 6 is a front view showing a schematic configuration of a tension tractor type printing apparatus. 1 ... platen, 2 ... print head, 11 ... continuous paper guide member, 12 ... tip of continuous paper guide member, 21 ...
Paper presser, 22 ... Escape part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A printing apparatus, comprising: a platen; and a print head disposed opposite to the platen.
A continuous paper guide member is provided along the platen, and a paper presser for pressing the continuous paper against the platen at the upper side is in contact with or close to the leading end of the continuous paper guide member and downstream of the guide member. In the printing device, above the paper presser, the tip of the continuous paper guide member is pushed by the bent portion of the continuous paper when the continuous paper is fed backward, and is allowed to elastically deform and move in a direction away from the platen. A printing apparatus comprising a relief portion, wherein the continuous paper can be fed backward without being hindered by the continuous paper guide member.