JP2918954B2 - Paper transport guide mechanism for printing equipment - Google Patents

Description

The present invention relates to a paper sheet transport guide mechanism of a printing apparatus,
In particular, the present invention relates to a sheet transport guide mechanism of a printing apparatus including a pair of paper guides at front and rear positions in a sheet transport direction of a print head.

2. Description of the Related Art Conventionally, a printing apparatus of this type is provided with a print head, a card holder and a platen for holding paper sheets, and a paper holder and a platen arranged before and after the card holder and the platen. It is composed of a front paper guide (discharge direction side) and a rear paper guide (feed direction side) for guiding leaves.

In the printing operation of the printing apparatus having the above-described configuration, the card holder moves together with the print head, printing is performed in a horizontal direction on the paper sheet, and the paper sheet is fed between the front and rear paper guides. Are sequentially transported in the direction.

[Problems to be Solved by the Invention] However, in the above-described conventional apparatus, when a sheet is conveyed in a discharge direction in a state where the rear end (feeding direction) of the sheet is separated from the front paper guide, Because the trailing edge of the paper sheets may be caught on the end face of the front paper guide,
The printing operation is limited to a case where the paper sheet is in a bridge state between the front paper guide and the rear paper guide. That is, there is a disadvantage that the range of printable paper sheets is restricted by the position of the paper guide.

[Means for Solving the Problems] The present invention has been made to solve the above problems.
A print head, a card holder that is integrated with the print head, moves along with the printing operation, and guides the paper sheet, and is positioned on a movement locus of the card holder, guides the paper sheet, and performs the guide of the paper sheet. When the holder moves to the guide position and interferes with it, the printer shutter includes a printer shutter that can be retracted from the movement trajectory of the card holder, and a pair of paper guides disposed before and after the card holder in the paper sheet conveyance direction. When a paper sheet having a paper-side end portion between the pair of paper guides is conveyed in the discharge direction, the paper-direction side end portion of the paper sheet is once set in the suction direction paper of the pair of paper guides. In a state where the sheet is conveyed in the suction direction to a position guided by the guide, the side ends of the card holder and the printer shutter are aligned with the side ends of the sheet according to the width of the sheet. Until the card holder is moved, the printer shutter is rotated while rotating the printer shutter to dispose the card holder and the printer shutter between the pair of paper guides, and then the sheet is conveyed again in the discharge direction. It is something to do.

Example Next, an example of the present invention will be described in detail with reference to the drawings.

The printing apparatus shown in FIGS. 1A and 1B is provided with a print head 1, a card holder 3 and a platen 4 for holding paper sheets 2, and a card holder 3 and a platen 4 disposed before and after the card holder 3 and platen 4. 2, the front paper guide 5 and the rear paper guide 6, which guide the paper sheet 2 in the transport direction while sandwiching the paper 2 between the front paper guide 5 and the rear paper guide 6, that is, on the movement locus 1 of the print head 1. The printer shutter 7 is rotatably supported by the shaft 8 so as to be retractable from the movement locus 1, and includes a stopper 9 of the printer shutter 7.

In the printing apparatus having the above configuration, the rear end of the sheet 2 is the first.
As shown in FIG. 2B, when a sheet discharge command is issued at a position off the end of the front paper guide, the sheet 2
Is once conveyed in the suction direction 10 opposite to the discharge direction 11.

2 (a) and 2 (b) show that the paper sheet 2 is in the suction direction 10 once.
The rear end of the paper sheet 1 is detached from the card holder 3 and is in the rear paper guide 6.

After the conveyance in the suction direction 10, the card holder 3 moves until its side edge substantially coincides with the side edge of the paper sheet 2 as shown in FIG. 2B, and at the same time, the printer shutter 7 rotates. Comes on the movement locus 1 of the print head. The printer shutter 7 rotates to a position where the longitudinal direction thereof is the sheet conveyance direction and substantially coincides with the side end of the sheet 2. After the movement of the card holder 3 and the printer shutter 7, the paper sheets 2
Is sent in the discharge direction 11. At this time, since both side ends of the paper sheet 2 are guided in the feeding direction by the card holder 3 and the printer shutter 7, the rear end of the paper sheet does not catch on the end of the front paper guide 5 and is smooth. To enter the front paper guide 5 and perform a discharging operation.

[Effects of the Invention] As described above, according to the present invention, when a sheet is transported in the discharge direction at a position not guided by the paper guide, the sheet is temporarily moved in the suction direction opposite to the discharge direction. After the paper shutter is conveyed and the rear end thereof is drawn into the paper guide, the printer shutter and the card holder are moved to interpose the paper guide in a portion where the paper guide is not disposed, and then the paper sheets are moved in the discharge direction. And the card holder acts as a guide, so that the paper sheet does not get caught on the end of the paper guide, and even if printing is performed to the vicinity of the rear end of the paper sheet, the discharge operation can be performed smoothly, and the paper sheet This has the effect of expanding the printing range.

[Brief description of the drawings]

FIG. 1 is an operation explanatory view showing an embodiment of the present invention. FIG. 1 (a) is a side view of a printing apparatus, FIG. 1 (b) is a plan view thereof, and FIG. 2 (a) is a side view of a printing apparatus, and FIG. 2 (b) is a plan view thereof. 1 print head, 2 paper sheets, 3 card holder, 4 platen, 5 front paper guide, 6
Rear paper guide, 7 Printer shutter, 8
Shaft, 9 Stopper, 10 Suction direction, 11 Suction direction.

Claims (1)

(57) [Claims] 1. A print head, a card holder integrated with the print head and moving along with a printing operation to guide paper sheets, and a guide for paper sheets located on a movement locus of the card holder. When the card holder moves to this guide position and interferes with it, a printer shutter that can be retracted from the movement trajectory of the card holder, and a pair of paper guides disposed before and after the card holder in the paper sheet transport direction When an end on the conveyance direction side conveys the paper sheet between the pair of paper guides in the discharge direction, the end on the conveyance direction side of the paper sheet once becomes the pair of paper guides. In the state in which the sheet is conveyed in the suction direction to a position guided by the paper guide in the suction direction, the side ends of the card holder and the printer shutter are adjusted to the width of the paper sheet. The card holder is moved and the printer shutter is turned until the card holder and the printer shutter are arranged between the pair of paper guides until the card holder coincides with the side edge of the paper sheet. A sheet transport guide mechanism for a printing apparatus, wherein the leaf is transported in a discharge direction.