JPH089228B2 - Printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus that rotates a type carrier such as a petal type wheel to select a type and print.

2. Description of the Related Art Conventionally, in a printing apparatus using a type carrier such as a type wheel, it is necessary that the center of a type and the center of a hammer that strikes the type be aligned with the type selection motor selecting a specific type. is there. For this reason, many printers of this type are adjusted so that their centers coincide when assembled.

The conventional printing device will be described below. FIG. 6 is a perspective view of a main part of a conventional printing apparatus, in which 1 is a carriage base movably supported along a platen (not shown), and 2 are fingers 2a radially arranged.
A type wheel having a type character 2b at the tip of the wheel, 3 is a gear wheel that rotates integrally with the type wheel 2, 4 is a wheel shaft that is rotatably supported by the carriage base 1, and holds the type wheel 2 and the gear wheel 3, and 5 is a gear wheel. Pinion gear that meshes with 3,
6 is a type selection motor for rotating the pinion gear 5, and 7 is a type selection motor 6 rotatably supported by the carriage base 1 at the same rotation center as the rotation center of the wheel shaft 4.
Holding motor bracket, 8 is motor bracket 7
Is a screw that penetrates through an elongated hole (not shown in the figure) provided at one end of the screw and is screwed into a screw hole (not shown in the figure) provided in the carriage base 1. The motor bracket 7 can be fixed to the carriage base 1 by tightening. Reference numeral 9 is a hammer for striking a character, and 10 is a paper guide plate for pressing a printing paper (not shown in the figure) against the platen.

With respect to the conventional printing apparatus configured as described above, a method of adjusting the center of the character and the hammer 9 when the character selection motor 6 selects the character will be described below.

First, a jig having the same precision as the type wheel 2 is attached to the gear 3 instead of the type wheel 2, and the type selection motor 6 is energized so as to stop a certain type at a selected position,
If the center of the jig and hammer 9 are off the standard,
Loosen the screw 8 to allow the motor bracket 7 to rotate about the wheel shaft 4, and rotate the motor bracket 7 so that the center deviation between the jig and the hammer 9 falls within the standard.
After that, the screw 8 is tightened to fix the motor bracket 7 to the carriage base 1 again.

Problems to be Solved by the Invention However, in the above-described conventional configuration, the screw 8 needs to be operated from the front of the type wheel 2 when the readjustment is performed after the assembly is completed. Since the paper guide plate 10 and the platen are present and the screw 8 cannot be rotated as it is, it is necessary to adjust the carriage base 1 once and then reassemble it, which requires a long time for the readjustment. Had.

Means for Solving the Problems The present invention provides a screw which is held in a direction orthogonal to the rotation center axis of a type wheel and which adjusts a rotation angle of a motor bracket.

Operation With the above configuration, the screw can be operated from the side surface of the type wheel instead of the front surface.

Embodiment FIG. 1 is a perspective view of a main part of a printer according to an embodiment of the present invention, in which 2 is a type wheel having a type 2b at the tip of a finger 2a, 3 is a gear, 4 is a wheel shaft, 5 is a pinion gear. , 6 is a type selection motor, 9 is a hammer, and 10 is a paper guide plate, which have the same construction as the conventional example. 11
Is a carriage base that is movably supported along a platen (not shown in the figure) and has a folded piece 11a formed therein. 12 is a carriage base that is rotatable about the same rotation center as the rotation center of the wheel shaft 4. The motor bracket 12 is supported by 11 and holds the type selection motor 6, and the motor bracket 12 is provided with a folded piece 12a. As shown in more detail in FIG. 2 (a), the folded piece 11a has a screw hole 11b.
However, a hole 12b is formed in the folded piece 12a. 13 is a screw that penetrates the hole 12b and is screwed into the screw hole 11b, and 14 is a folded piece 11a and a folded piece
It is a spring arranged between 12a.

FIG. 4 is a top view of the main parts of the printer of this embodiment.
Is a bearing that rotatably holds the wheel shaft 4 and rotatably holds the motor bracket 12, and 16 is a retaining ring that engages with the bearing 15 and fixes the bearing 15 to the carriage base 11.

With respect to the printing apparatus of the present embodiment configured as described above, a method of adjusting the center of the character and the hammer 9 when the character selection motor 6 selects the character will be described below.

First, the type selection motor 6 is energized to stop a certain type at the selected position. If the center of the jig and the hammer 9 are deviated from the standard as shown in FIG.
Turn the screw 13 in the direction to loosen the screw 13 as shown in FIG. Then, the folded piece 12a is lifted by the restoring force of the spring 14, and the motor bracket 12 rotates about the wheel shaft 4 in the direction indicated by the arrow A in FIG. Then, as shown in FIG. 5 (b), the operation of the screw 13 is stopped when the deviation between the center of the character and the center of the hammer 9 is within the standard.

In addition, in the printing apparatus of the present embodiment, the screw is attached to the printing wheel 2
Since the platen and the paper guide plate 10 do not get in the way, the readjustment can be performed without disassembling, and a printing device with extremely good maintainability can be obtained.

EFFECTS OF THE INVENTION The present invention is provided with a screw for adjusting the rotation angle of a motor bracket, which is held in a direction orthogonal to the rotation center axis of a type wheel, and the screw is operated not from the front side but from the side. Therefore, the platen and the paper guide plate do not get in the way, the readjustment can be performed without disassembling, and it is possible to obtain the printing apparatus having the excellent maintainability.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a printer according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are sectional views of the same part, FIG. 3 is a front view of the same part, and FIG. 5A and 5B are a top view of the main part, and FIG. 6 is a perspective view of the main part of a conventional printing apparatus. 2 …… Type wheel, 2a …… Fingers, 2b …… Type,
3 ... Gear, 4 ... Wheel axis, 5 ... Pinion gear,
6 …… Type selection motor, 9 …… Hammer, 10 …… Paper guide plate, 11 …… Carriage base, 11a …… Folded piece, 12 ……
Motor bracket, 12a …… Folded piece, 13 …… Screw, 14 ……
Spring, 15 ... Bearing, 16 ... Retaining ring.

Claims (1)

[Claims] 1. A first gear that rotates integrally with a print carrier,
A chassis that rotatably supports the first gear, a motor bracket that is rotatably supported by the chassis with the same rotation center as the rotation center of the first gear, and a type that is supported by the motor bracket. A selection motor and a second gear that is driven by the type selection motor and meshes with the first gear are provided and are held in a direction orthogonal to the rotation center axis of the first gear to adjust the rotation angle of the motor bracket. A printer provided with a screw.