JPH072209Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a printer, and more particularly, to improvement of a printer that prints on paper fed from a paper roll.

[Conventional technology]

In the above-described printer that prints on the paper fed from the paper roll, generally, in order to prevent the paper from skewing, a skewing prevention member that is in sliding contact with both side edges of the paper is provided. The skew feeding prevention member is provided independently so as to be movable in the width direction of the sheet.

[Problems to be solved by the invention]

However, in such a printer, in order to perform printing with different paper widths of the paper rolls, the position of the skew feeding prevention member must be adjusted to match the paper width of the paper rolls every time the paper rolls are replaced. Therefore, the work of replacing the paper roll is complicated, and if printing is performed without adjusting the position of the skew feeding prevention member, the paper is skewed and printed obliquely on the paper. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printer which overcomes the problems of the conventional ones, can easily replace a paper roll, and can reliably prevent the paper from skewing.

[Means for solving problems]

SUMMARY OF THE INVENTION The present invention has a pair of cylindrical cores of a paper roll, which have protrusions that are inserted into the core from both ends to sandwich the paper roll and that are movable in the paper width direction of the paper roll. A holding member and a skew feeding preventing member that slidably contacts both side edges of the paper fed from the paper roll to prevent the paper from skewing, and the holding members are pressed against the paper roll by elastic force. In addition to providing an elastic member that urges in the direction of the sheet, each of the holding members is integrally provided with the skew member that slidably contacts the side edge of the sheet on the upstream side and the downstream side of the printing position on the sheet. I am trying.

[Action]

According to the present invention, the skew feeding prevention member is driven by the movement of the holding member due to the urging force of the elastic member when the paper roll is replaced, and slides on both side edges of the paper at a position adapted to the paper width of the paper roll. It is possible to prevent the sheet from skewing stably.

〔Example〕

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

1 and 2, in the casing 2 of the printer 1, a pair of plate-shaped holding members 3A and 3B are arranged facing each other with a space left and right and extending vertically. The holding members 3A, 3B are urged in directions toward each other by coil springs 5A, 5B as an example of elastic members interposed between the side walls 4A, 4B of the casing 2. ing. Further, projections 6A, 6B are provided on both holding members 3A, 3B so as to face each other, and these projections 6A, 6B are provided from both ends of the cylindrical core body 8 of the paper roll 7 to the core body. 8 is inserted in the paper roll 7 and the coil rolls 5A, 5
It is designed to be clamped by the spring force of B. The paper roll 7 is formed by spirally winding a paper 9 around the core 8. The paper width of the paper 9 is equal to the axial length of the core 8.

A platen 10 having an axis parallel to the axial direction of the paper roll 7 is disposed in the casing 2 spaced from the paper roll 7 sandwiched between the holding members 3A and 3B. Pressing rollers 11, 11 are pressed against the platen 10, and the paper 9 fed from the paper roll 7 is nipped and conveyed between the platen 10 and the pressing rollers 11, 11. Further, in the casing 2 in front of the platen 10, a print head 12 composed of a thermal head or a dot wire is disposed so as to be movable in the axial direction of the platen 10, and the print head 12 allows the paper on the platen 10 to be moved. 9 is printed.

In FIG. 1, an inclined wall 14 is formed on the upper wall 13 of the casing 2 at a substantially central position between the paper roll 7 and the platen 10, and the inclined wall 14 holds the slit-shaped paper 9 which is long in the lateral direction. A discharge port 15 is formed. Further, in the casing 2 adjacent to the discharge port 15, a cutter 16 composed of a fixed blade 17 and a movable blade 18 coming in and out of contact with the fixed blade 17.
The cutter 16 cuts the rear end of the sheet 9 discharged from the discharge port 15 to the outside of the casing 2. Further, in the casing 2, two pairs of guide plates 19A and 19A for winding the paper 9 fed from the paper roll 7 around the platen 10 and discharging it from the discharge port 15 are provided.
B and the guide plates 20A, 20B are arranged at a distance from each other, and the guide plate 19A, 19B, 20A, 20B allows the sheet 9 to be discharged from the sheet roll 7 with a substantially U-shaped path.
It is supposed to reach 15.

The holding members 3A, 3B are provided with plate-like skew feeding prevention members 21A, 21B which project from the lower ends of the holding members 3A, 3B toward the platen 10 and prevent the sheet 9 from skewing, integrally with the holding members 3A, 3B. Both skew feeding preventing members 21A and 21B are provided so as to project so as to prevent the skew of the sheet 9 by sliding contact with both side edges of the sheet 9 fed from the sheet roll 7. Further, the holding members 3A, 3B have a plate-like skew feeding prevention member 22A that protrudes upward from the upper ends of the holding members 3A, 3B and that prevents the sheet 9 from skewing, similar to the skew feeding prevention members 21A, 21B. , 22B are provided integrally with the holding members 3A, 3B so as to project. The skew preventing members 22A, 22B are provided on the upper wall 13 of the casing 2 immediately above the holding members 3A, 3B.
Faces the upper wall 13 of the casing 2 through openings 23A and 23B formed over the entire movement range of the casing 2.

According to the above-mentioned configuration, the sheet 9 fed from the sheet roll 7 held by the holding members 3A, 3B by the spring force of the coil springs 5A, 5B is provided on both side edges of the holding members 3A, 3B in a skewed manner. The prevention members 21A and 21B are slidably in contact with each other to prevent the paper 9 from skewing, and the paper 9 discharged from the discharge port 15 to the outside of the casing 2 has both side edges that are also integrated with the holding members 3A and 3B. The row prevention members 22A and 22B are in sliding contact with each other to prevent the sheet 9 from skewing. Therefore, the paper 9 is conveyed without skewing, and the print head 12 can accurately print on the paper 9 in the width direction of the paper 9.

By the way, when the paper width of the paper roll 7 is changed as needed to print on the paper 9 having different paper widths, both holding members are used.
3A and 3B are expanded against the spring force of the coil springs 5A and 5B, the paper roll 7 that has been used up to now is removed from the holding members 3A and 3B, and the paper rolls 7 having other paper widths are held by the holding members 3A and 3B. Hold it in between. Then, the skew feeding prevention member 21 integrated with the holding members 3A and 3B is provided.
A, 21B and skew prevention members 22A, 22B move together with the holding members 3A, 3B, and the distance between these skew prevention members 21A, 21B and skew prevention members 22A, 22B is new to the paper 9 of the paper roll 7. Since the spacing is the same as the paper width of
A, 21B and skew prevention members 22A, 22B can be automatically adapted to the paper width of the paper roll 7 sandwiched between the holding members 3A, 3B without any adjustment, and these skew prevention can be prevented. The members 21A and 21B and the skew feeding prevention members 22A and 22B are used for the paper 9
It is possible to prevent the skew of the sheet 9 by sliding contact with both side edges of the sheet 9.

As described above, according to this embodiment, even if the paper width of the paper roll 7 changes, the paper roll 7 is sandwiched between the holding members 3A and 3B so that the skew prevention members 21A and 21B are integrated with the holding members 3A and 3B. In addition, the skew feeding prevention members 22A and 22B automatically slide on both side edges of the sheet 9 so that the sheet 9 is prevented from skewing.
The skew feeding member 21A, 21B facing the upstream side of the printing position and the skew feeding preventing members 22A, 22B facing the downstream side of the printing position without requiring complicated work skew the sheet 9 fed from the paper roll 7. Can be stably prevented. Also,
Since each holding member 3A, 3B moves by the urging force of the coil springs 5A, 5B, the positioning accuracy of the paper 9 can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made.

[Effect of device]

As described above, according to the present invention, the skew feeding prevention member integrated with the holding member that is urged by the elastic member and holds the paper roll is automatically adjusted to the paper width of the new paper roll without any special work. Prevents skewing of the paper at a suitable interval, and the skewing prevention member prevents skewing of the paper not only on the upstream side of the printing position but also on the downstream side of the printing position, thus preventing skewing every time. Not only the paper roll can be easily replaced without moving the member independently according to the paper width, but also the paper positioning accuracy can be obtained. Moreover, it is possible to reliably prevent the skew of the sheet.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an essential part showing an embodiment of a printer according to the present invention, and FIG. 2 is a vertical sectional view of a substantial portion taken along the line II-II of FIG. 1 ... Printer, 2 ... Casing, 3A, 3B ... Holding member, 5A,
5B ... Coil spring, 7 ... Paper roll, 9 ... Paper, 10 ... Platen, 12 ... Print head, 15 ... Discharge port, 21A, 21B, 22A, 22B
... skew prevention member.

Claims (1)

[Scope of utility model registration request] 1. A paper roll having a cylindrical core body having both projections which are inserted into the core body from both ends thereof to sandwich the paper roll and which are movable in the paper width direction of the paper roll. In a printer having a pair of holding members and a skew feeding prevention member that slidably contacts both side edges of the paper fed from the paper roll to prevent skew of the paper, each holding member is elastically attached to the paper roll. In addition to providing an elastic member that urges in the pressing direction, the holding members are integrally provided with the skew members that slidably contact the side edges of the paper on the upstream side and the downstream side of the printing position on the paper. Characteristic printer.