JPH0568657U - Wire dot impact printer - Google Patents

Abstract

(57) [Summary] [Structure] A platen 1 and a wire dot print head 2 as a printing mechanism, and a feed roller 5 as a printing paper conveying unit.
The printing mechanism and the printing paper transporting section are surrounded by a housing composed of an upper cover 8 and an upper surface of a main body cover constituting the table 9a. A sheet insertion port 12 for inserting a sheet into the printer is formed on the front surface of the housing. The upper cover 8 of the paper insertion opening 12 has a paper insertion opening shutter 20 that closes the paper insertion opening 12 and whose lower side is swingable. [Effect] It is possible to prevent noise at the time of printing by the wire dot printer, and at the same time, when the printing paper is inserted, it is pushed by the printing paper and opens only a necessary gap, so that it does not hinder the insertion of the printing paper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wire dot impact printer, and more specifically to a cover structure for a dot impact printer.

[0002]

[Prior Art]

 In a wire dot impact printer, a metallic printing wire projects from the tip of the print head in accordance with an electrical signal, and the tip of the printing wire collides with the printing medium via the ink ribbon, thereby printing on this printing medium. is there. Therefore, if the ink of the ink ribbon is properly selected, not only high-quality paper but also recycled paper or plastic sheet can be selected for printing.

On the other hand, however, the wire dot impact printer cannot, in principle, prevent the noise generated by the impact when the tip of the print wire collides with the print medium. For this reason, attempts have been made to contain the impact noise in the housing with a printer cover, etc., to minimize the noise.

FIG. 4 is a side sectional view showing a printer of this type. As an example, take a printer for horizontal printing. In the figure, the printer includes a platen 1 as a printing unit, a print head 2 facing the platen 1, a carriage 3 that mounts the print head 2 and moves in parallel to the platen 1, and the carriage 3 in parallel with the platen 1. It has guide shafts 4a, 4b for guiding. It has feed rollers 5a to 5d, paper guides 6a to 6h, and discharge rollers 7a and 7b that discharge the paper to the outside of the printer as a print paper conveying unit. These internal mechanisms are housed in a housing, and the housing is composed of an upper cover 8 and a main body cover 9. A table 9a for setting the paper 10 is formed on the main body cover 9, and a gap between the main cover 9 and the upper cover 8 serves as a paper insertion port 12. A stacker 11 for stacking the sheets discharged by the discharge roller 7 is provided on the discharge roller 7 side of the main body cover 9.

Such a horizontal printer operates as follows. For example, the paper 10 is rubbed by hand on the table 9a and inserted into the printer through the paper insertion hole 12. The inserted sheet 10 is sucked inward by the feed rollers 5a and 5b and set under the print head 2. In this state, the print wire projects from the print head toward the platen 1, and the ink of the ink ribbon (not shown) is transferred to the paper 10. By repeating this, a predetermined character or graphic is printed on the paper 10. After printing, the paper 10 is discharged onto the stacker 11 by the discharge roller 7.

[0006]

[Problems to be solved by the device]

 In such a printer, the platen 1 and the print head 2 are housed in a housing composed of an upper cover 8 and a lower cover 9, so that impact noise is confined in the housing and noise is reduced.

However, since the paper insertion opening 12 is provided in the front of the housing and the impact sound leaks from this, it was very noisy for the operator working in front of the housing.

[0008]

[Means for Solving the Problems]

 This invention was made in order to solve the above-mentioned problem that the operator who is working in front of the housing is uncomfortable because the print sound of the wire dot printer is loud.

Therefore, in the present invention, in the wire dot print head in which the wire dot print head that is a noise source is housed in the housing having the paper insertion opening, the lower side of the upper cover above the paper insertion opening is oscillated. An upper edge is attached to the upper cover so as to rotate freely, and a paper insertion shutter configured to close the paper insertion opening is provided.

[0010]

[Action]

 In the present invention, since the paper insertion opening is closed by the swingable paper insertion opening shutter as described above, it is possible to prevent noise when printing with a wire dot printer, and at the same time, when printing paper is inserted, this printing is performed. It does not interfere with the insertion of printing paper as it is pushed by the paper and opens only the necessary gap.

[0011]

【Example】

 FIG. 1 is a side sectional view of a printer for explaining an embodiment of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG. The printer has a sheet insertion port shutter 20 so as to close the sheet insertion port 12.

As shown in FIGS. 2 and 3, the sheet insertion port shutter 20 has an elongated plate shape, and a sheet insertion port shutter shaft 21 at the upper long side thereof is fixed to the upper cover 8. This allows it to swing freely. When the sheet 10 is not inserted, the other long side of the sheet insertion port shutter 20 hangs down due to its own weight to close the sheet insertion port 12. The table 9a has a paper insertion opening 10 portion having a groove-like recess 22 along the circumference centered on the paper insertion opening shutter shaft 21 so that the lower side of the paper insertion opening shutter 20 is fitted. To be done. The recesses 22 are provided intermittently as shown in FIG. 3, and accordingly, in the lower long side of the sheet insertion opening shutter 20, the corresponding portions of the recesses 22 are protruding, and the non-recessed portions are Not protruding.

As described above, since the paper insertion port shutter 20 is provided at the paper insertion port 12, the print noise generated by the print head 2 and the platen 1 is blocked by the paper insertion port shutter 20 and is provided in front of the printer. It will not leak to the operator side. In particular, in this embodiment, since the table 9a has the recess 22 and the paper insertion opening shutter 20 is configured to be fitted into the depression 22, the paper insertion opening shutter 20 is moved between the table 9a and the table 9a. The noise from the gap provided slightly also bypasses the recess 22 and leaks out, so that it becomes very small.

In order to print with such a printer, the following is performed. As shown in FIG. 1, first, when the paper 10 is placed on the table 9a and manually inserted into the paper insertion opening 12, the paper 10 comes into contact with the paper insertion opening shutter 20 and pushes the paper insertion opening shutter 20. As a result, the sheet insertion port shutter 20 is pushed inward and rotates in the direction of arrow A shown in FIG. When it is further inserted, the leading end of the sheet 10 collides with the feed rollers 5a and 5b shown in FIG. At this time, when an optical sensor (not shown) provided in the vicinity of this is turned on, the sheet is fed by the feed rollers 5a and 5b to feed the sheet 20 to the printing position. After printing, the sheet is ejected to the stacker 11 or the table 9a by selecting a switch (not shown). At this time, in order to prevent the tip of the sheet 10 from falling into the recess 22 to make it difficult to insert the sheet 10 or the feed failure when the sheet 10 after printing is discharged to the table 9a, the table 9a is prevented from being fed. Instead of providing the groove-shaped depressions 22 over the entire surface, the depressions 22 are intermittently provided to support the sheet 10 when it is fed.

The printed paper 10 can be fed to both the stacker 11 and the table 9a. However, when the paper 10 is fed to the table 9a, the paper 10 is fed from the inside of the printer to the arrow of the paper insertion port shutter 20. By pushing in the B direction, the sheet insertion port 12 is opened and the sheet is discharged onto the table 9a.

[0016]

[Effect of the device]

 As described above, according to the present invention, since the swingable sheet insertion port shutter is provided at the sheet insertion port, the impact sound of the wire dot printer is trapped inside without interfering with the sheet insertion work. It can prevent noise. In particular, by configuring the sheet insertion port shutter and the recess provided in the table to fit together, it is further effective in preventing noise.

[Brief description of drawings]

FIG. 1 is a side sectional view of a printer according to an embodiment of the present invention.

FIG. 2 is a side view of a paper insertion opening shutter according to an embodiment of the present invention.

FIG. 3 is a perspective view of a sheet insertion opening shutter according to an embodiment of the present invention.

FIG. 4 is a side sectional view of a conventional printer.

[Explanation of symbols]

 1 Platen 2 Print Head 3 Carriage 4 Guide Shaft 5 Feed Roller 6 Paper Guide 7 Ejection Roller 8 Upper Cover 9 Body Cover 9a Table 10 Paper 11 Stacker 12 Paper Insertion Port 20 Paper Insertion Portion Shutter 21 Paper Insertion Port Shutter Shaft 22 Recess

Claims (1)

[Scope of utility model registration request] 1. A printing mechanism having a wire dot printing head and a platen, a printing paper transport unit for transporting paper to the printing mechanism, a main body cover whose upper surface constitutes a table, and an upper cover. A wire dot impact printer configured to form a paper insertion port for supplying a paper to a print paper transport unit, and a housing containing the print mechanism and the print paper transport unit, wherein the upper cover includes: A wire dot impact printer having a plate-shaped sheet insertion port shutter configured so that the upper long side is attached to the upper cover so that the lower long side can swing freely, and the sheet insertion port is closed. .