JPH0292671A - Sheet supplying and discharging device for printer - Google Patents

Abstract

PURPOSE:To print a many section sheet up to both ends thereof by mounting a shaft at the side of a printing head movably in parallel according to the rotation of an eccentric gear. CONSTITUTION:In case of a line feeding, a printing interval regulating motor 12 starts rotating slightly before the start of rotation of a line feed motor 51, and a gear 11 mounted at the end of a shaft 55a at the side of the head is rotated. The shaft 55a is so secured eccentrically at the gear 11 as to approach nearest a platen 52 at the time of printing. Thus, the shaft 55a of the side of the head is increased at an interval to the platen 52 upon rotation of the gear 11. Accordingly, even if many sheets are used, the disturbance of a normal line feeding due to the engagement of a stapled part is eliminated, and its printing range can be taken fully of the width of the sheet, thereby obviating a wasteful sheet.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper feed/discharge device for a printer, and particularly to a paper feeder for a printer suitable for using multiple sheets of paper such as pressure-sensitive paper or carbon paper. This relates to a paper ejecting device.

[Conventional technology]

FIG. 3 shows a conventional example. The conventional example in Fig. 3 is
a linefeed motor 51; a platen 52 which is biased with rotational force by the linefeed motor 51;
A print head 53 that prints on the paper on the platen 52, a carrier 54 on which the print head 53 is mounted, a spacing motor 56 that urges the carrier 54 to reciprocate, and a spacing motor 56 that guides the reciprocating movement of the carrier 54. It includes a pair of fixed shafts 55a and 55b.

The line feed motor 51 is activated, and the multiple sheets of paper half-wound around the platen 52 are fed to a predetermined position and then stopped. Next, the carrier 54 carrying the print head 53 prints on multiple sheets of paper while reciprocating left and right along shafts 55a and 55b fixed to the chassis. - When printing for a line is completed, the platen 52 rotates again to feed the paper.

[Problem B to be Solved by the Invention] However, in the above conventional example, since the distance between the platen 52 and the print head 53 is kept constant, when printing is performed close to the left and right edges of multiple sheets of paper, This is maintained even if For this reason, even if, for example, the print head 53 were to be caught by a stapler or the like that is sucking multiple copies of paper, there was no means to avoid this situation. For this reason, the inconvenience of line break errors sometimes occurred.

For this reason, the printing range is limited to an area within a certain dimension from both ends of the multi-copy paper, and there is a drawback that wasteful areas that cannot be printed are forced to be provided at both ends of the multi-copy paper.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feed/discharge device for a printer that can improve the disadvantages seen in the conventional example and is capable of printing close to both ends of multiple copies of paper.

[Means to solve the problem]

The present invention includes a line feed motor, a platen to which rotational force is applied by the line feed motor, a print head that prints on paper on the platen, a carrier on which the print head is mounted, and a reciprocating movement of the carrier. It is equipped with a spacing motor that energizes the carrier, and a pair of shafts that guide the reciprocating movement of the carrier. and,
Out of the pair of shafts, one end of the shaft on the print head side is equipped with an eccentric gear whose central axis is eccentric, and a printing interval adjustment motor that applies rotational force to this eccentric gear is arranged. A method is adopted in which the shaft on the print head side is mounted so that it can move in parallel according to the rotation of the eccentric gear. This aims to achieve the above-mentioned purpose.

[For production]

Multiple sheets of paper are fed by a platen rotated by a line feed motor, and are fed to a predetermined position and then stopped. Next, the carrier carrying the print head prints on multiple sheets of paper while reciprocating from side to side along the shaft. −
When printing for a line is completed, the platen rotates again and feeds the paper. At the time of this line feed, the print interval adjustment motor rotates to rotate a gear attached to the end of the shaft on the print head side. The shaft on the print head side is
It is eccentrically fixed to this gear. Therefore, as the gear rotates, the distance between the shaft of the print head example and the platen increases. At the same time, the print head mounted on a carrier that reciprocates left and right on two shafts also expands the distance from the platen as the print head side shaft moves.

When the line feed is completed, the print interval adjustment motor rotates again to return the print head side shirt 1- to its original position, and at the same time, the print head also returns to its original position and begins printing.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained based on FIGS. 1 and 2. Here, the same reference numerals are used for the same constituent members as in the conventional example described above, and the description thereof will be omitted.

The embodiment shown in FIG. 1 includes a line feed motor 51, a platen 52 to which rotational force is applied by the line feed motor 51, a print head 53 that prints on paper on the platen 52, and a print head 53 that prints on paper on the platen 52. It includes a carrier 54 mounted thereon, a spacing motor 56 that urges the carrier 54 to reciprocate, and a pair of shafts 55a and 55b that guide the reciprocating motion of the carrier 54. Of the pair of shafts 55a and 55b, a gear 11 with an eccentric central axis is provided at one end of the shaft 55a on the side of the print head 53, and a gear 11 is provided for adjusting the printing interval to apply rotational force to the gear 11. A motor 12 is provided, and at the same time, a shaft 55a on the print head side is mounted so as to be movable in parallel according to the rotation of the gear 11.

At this time, the print head side shaft 55a is eccentrically fixed to the gear l2 so as to come closest to the platen 52 during printing. On the other hand, the other shaft 55b is fixed to the housing 100.

Next, the operation of this embodiment will be explained.

Platen 5 rotated by line feed motor 51
The multi-copy sheet 13 fed by 2 is fed to a predetermined position and stopped (point A in FIG. 2).

Next, the carrier 54 reciprocates left and right along the shafts 55a and 55b by the driving force of the spacing motor 56, and at the same time, the print head 53 mounted on this carrier prints on the multi-copy paper 13 (AB in the figure). while). When a portion of printing is completed (point B in the figure), the line feed motor 51 rotates again, rotates the platen 52, and feeds the multi-copy paper 13 (between BC in the figure). At the time of this line feed, slightly earlier than the line feed motor 51 starts rotating again (point B in the figure), the print interval adjustment motor 12 starts rotating (dotted point in the figure), and the end of the shaft 55a on the print head side (DE in the figure)
while). The print head side shaft 55a is eccentrically fixed to the gear 11 so as to be closest to the platen 52 during printing. Therefore, as the gear 11 rotates, the distance between the shaft 55a on the print head side and the platen 52 increases. At the same time, the carrier 5 reciprocates left and right on the two shafts 55a and 55b.
The distance between the print head 53 mounted on the print head 4 and the platen 52 also increases as the print head side shaft 55a moves. A line feed is performed while the distance between the print head 53 and the platen 52 is expanded (between BC and BC in the figure).

When the line feed is completed (point C in the figure), the print interval adjustment motor 12 rotates the gear 11 exactly once to return the print head shaft 55a to its original position (point E in the figure), and at the same time, the motor 12 rotates the gear 11 exactly once to return the print head side shaft 55a to its original position (point E in the figure), and at the same time, the motor 12 rotates the gear 11 exactly once to return the print head shaft 55a to its original position (point E in the figure). returns to its original position and resumes printing.

〔Effect of the invention〕

As explained above, according to the present invention, the print head is moved away from the platen only while performing a line feed, so even when multiple sheets are used, the stapled portion may get caught and the line feed cannot be performed normally. It is possible to provide a paper feeding device for a printer that is unprecedented and excellent in that there is no interference, the printing range can be extended to 111 sheets of paper, and there is no wastage of paper.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a time chart showing the operation of the present invention, and FIG. 3 is a perspective view showing a conventional example. 11...Gear, 12...Motor for adjusting printing interval, 13...Multi-copy paper, 51...
・Line feed motor, 52...Platen,
53... Print head, 54... Carrier, 55a, 55b... Shaft, 56...
...spacing motor. Figure 2 E

Claims (1)

[Claims] (1) A line feed motor, a platen to which rotational force is applied by the line feed motor, a print head that prints on paper on the platen, a carrier on which this print head is mounted, and a reciprocating movement of this carrier. In a printer paper feed/discharge device comprising a spacing motor that energizes the carrier, and a pair of shafts that guide the reciprocating movement of the carrier, one end of the shaft on the print head side of the pair of shafts. is equipped with an eccentric gear whose central axis is eccentric, and a print interval adjustment motor that applies rotational force to this eccentric gear, so that the shaft on the print head side can be moved in parallel according to the rotation of the gear. A paper feed/discharge device for a printer characterized by being installed.