JPH052963U - Holding device for guide shaft of carriage - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate the rattling of the print head during running and to obtain highly reliable print quality. [Structure] A sleeve 8 slidably fitted on an auxiliary guide shaft 1 of a carriage 2 is held by an elastic holder 10 attached to the carriage so as to be pressed against one side surface of the carriage 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a holding device for a guide shaft of a carriage that supports a print head of a printer.

[0002]

[Prior Art]

 To move the print head of the printer in the main scanning direction (row direction) in order to print over one line of paper, attach the print head to the carriage integrally and move this carriage during printing operation. However, in order to stably move the carriage horizontally, the carriage is usually held by two guide shafts.

FIG. 2 is a configuration diagram of an upper end portion of a conventional carriage, in which an upper auxiliary guide shaft 1 contacts a U-shaped holder portion 2 a provided integrally with a carriage 2 at two points. It is configured to do.

However, in the above-mentioned conventional device, the part in contact with the wire is worn quickly and lacks in durability, and therefore the device shown in FIG. 3 is used.

FIG. 3 is a configuration diagram of a holding device for a guide shaft of a carriage according to the conventional example, in which a lower main guide shaft 3 in addition to an upper auxiliary guide shaft 1 is fitted to a carriage 2. With these two guide shafts 1 and 3, the print head 4 mounted on the carriage 2 can be moved horizontally with respect to the platen 5. Reference numeral 6 is a ribbon cassette, and 7 is a plurality of conveying roller pairs for conveying the print medium P.

Cylindrical sleeves 8 and 9 are fixedly provided on the holder portion 2a of the auxiliary guide shaft 1 of the carriage 2 and the sliding portion of the main guide shaft 3, respectively. It is fitted in 8 and 9. 2b is a holder portion of the sleeve 9.

Therefore, when the carriage 2 moves, the sleeves 8 and 9 slide in circular contact with the guide shafts 1 and 3, so that the guide shaft 1 and the holder portion 2a shown in FIG. The wear rate is reduced and durability can be increased as compared with the conventional example.

[0009]

[Problems to be solved by the device]

 However, in the conventional device shown in FIG. 3, play (a minute gap) between the guide shafts 1 and 3 (especially the guide shaft 1) and the inner diameters of the sleeves 8 and 9 (especially the sleeve 8) and the sleeves 8 and 9 and the holder portion. Play between the 2a and 2b (particularly the holder portion 2a) is accumulated, which causes rattling when the carriage 2 moves. Also, the amount of play differs at the print head movement position, for example, the left end and the right end. As a result, there is a problem that the print quality such as print density is not constant at the left end and the right end.

Incidentally, the gap between the print head 4 and the print surface of the print medium supported by the platen 5 is usually about 0.1 mm, but the accumulated play described above is about 0.08 mm. In many cases, the print quality was adversely affected. It is an object of the present invention to provide a holding device for a guide shaft of a carriage, which can obtain a qualitative and reliable printing quality.

[0011]

[Means for Solving the Problems]

 To achieve the above object, in the present invention, the sleeve on which the auxiliary guide shaft is fitted is attached to the carriage in order to minimize the play particularly in the engaging portion of the auxiliary guide shaft which causes rattling. It is characterized in that the attached elastic holder is held so as to abut against one side surface of the carriage.

[0012]

[Action]

 The play between the guide shaft and the sleeve due to the pressing force of the elastic holder disappears at least on the side that receives the urging force, and the play between the elastic holder and the sleeve disappears when the elastic holder presses against the sleeve.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The same members as those in the conventional example are designated by the same reference numerals, and duplicate description is omitted.

FIG. 1 is a configuration diagram of a carriage unit according to an embodiment of the present invention, in which a sleeve 8 slidably engaged with an upper guide shaft 1 is provided in a groove 2c provided on one side of an upper portion of a carriage 2. , Is immovably fitted in the axial direction, and is pressed and held by an elastic holder 10 attached to the carriage 1.

The elastic holder 10 has a bottom portion 10 a that supports the bottom surface of the sleeve 8 and a rising portion 10 b that is pressed against one side surface of the sleeve 8 and presses the other side surface against the side surface of the carriage 2. Is screwed to the side surface of the carriage 2.

Therefore, the sleeve 8 and the auxiliary guide shaft 1 are in close contact with each other within a range where frictional resistance during sliding can be ignored, and the elastic holder 10 and the sleeve 8 are also in close contact with each other. As a result, since there is no play between the auxiliary guide shaft 1 and the sleeve 8 and between the sleeve 8 and the elastic holder 10, the rattling of the carriage 2 during the printing operation and the rattling of the printing head 4 are eliminated. You can

[0017]

[Effect of the device]

 As described above, according to the present invention, the sleeve that is slidably fitted to the auxiliary guide shaft is held by being pressed against the side surface of the carriage by the elastic holder. It is possible to perform a non-printing operation, and as a result, it is possible to always obtain stable print quality.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating a holding device for a guide shaft of a carriage according to an exemplary embodiment of the present invention.

FIG. 2 is a configuration diagram showing a holding device according to a conventional example.

FIG. 3 is a configuration diagram of a holding device according to another conventional example.

[Explanation of symbols]

 1 Auxiliary guide shaft 3 Main guide shaft 2 Carriage 4 Print head 5 Platen 8, 9 Sleeve 10 Elastic holder

Claims (1)

Claims for utility model registration Claims: 1. A holding device for a guide shaft of a carriage, which holds a sleeve, which is slidably engaged with an auxiliary guide shaft parallel to a main guide shaft of a carriage supporting a print head, on the carriage. In said carriage, a groove for fitting a part of the peripheral wall of said sleeve in the axial direction immovably is provided, and an elastic holder for elastically pressing the sleeve fitted in the groove in the groove direction is attached. A guide shaft engaging device for a carriage.