JPH03216368A - Carriage mechanism of printer - Google Patents

Abstract

PURPOSE:To alter the expensive rolling bearing in a motor to an inexpensive slide bearing by providing a motor shaft so as to extend the same from a motor casing and supporting the extended part thereof by a bearing separate from the bearing of the motor casing. CONSTITUTION:A motor shaft 22 is provided so as to be extended from a motor casing 21a in a vertical direction and the extended parts 22a, 22n thereof are supported by bearings 7, 8 separate from the bearings 23, 24 of the motor casing. The bearings 7, 8 are slide bearings to be mounted to a support plate 13. Therefore, a motor 21 receives the tension of a belt 10 by a motor flange 25 through the bearings 7, 8 and the support plate 13. As a result, the tension of the belt 10 is not directly applied to the bearings 22, 23 of the motor casing.

Description

[Detailed description of the invention] [Usage field of industry L] The present invention [Conventional technology] Regarding the rigid mechanism.

The carriage mechanism of a conventional printer is shown in FIGS. 3 and 4.

As shown in FIG. 3, a driving pulley 6 fixed on the motor shaft 22 and a driven pulley 5 located on the shaft 4" fixed on the printer frame (not shown) are stretched. The carriage 3 fixed to the helt 10 has a guide shaft 11,
12 in the left and right direction in front of the platen 2. The motor 21 is fixed to the support plate 13 by a motor flange 25.

[Problem to be solved by the invention]

However, the above-mentioned conventional technology has the following problems.

As shown in FIG. 4, the motor shaft 22 is always subjected to a load from the front side to the back side of the drawing due to the tension of the wheels 1 and 10, and the motor shaft 22 is supported by rolling bearings 23 and 24 provided in the motor casing 21a. I support it. Therefore, due to the tension of Hells 1 and 10, the bearings 23 and 24 of the motor casing
A high load is applied to the bearings, the inner diameters of the bearings 23 and 24 are enlarged, and the gap between the rotor 26 and the yoke 27 changes, resulting in a problem in that the motor performance tends to deteriorate. To prevent this, a rolling bearing with a variable bearing inner diameter is required. However, such a rolling bearing has a problem that the structure is complicated and expensive, and the motor is expensive. Further, there is a problem in that the tension load due to the motor used is restricted.

Therefore, the present invention solves these problems, and the LJ feature is that the tension applied to the motor shaft is supported by a bearing other than the motor casing bearing, thereby eliminating the need for an expensive rolling bearing inside the motor. To make it possible to change to an inexpensive sliding bearing and to set belt tension regardless of the strength of the motor bearing.

[Means to solve the problem]

The side of the carriage machine of the present invention includes a carriage that carries a print head in front of a platen that holds printing paper and moves from side to side, a guide shaft that supports this carriage, a driven pulley that is fixed to the carriage, and a motor shaft. In the printer carriage mechanism, the motor shaft is extended from the motor casing, and the extended portion is mounted in a bearing different from the bearing of the motor casing. Characterized by support.

[Effect]

According to the above configuration of the present invention, the tension load of the belt is supported by a bearing different from the bearing of the motor casing. Therefore, the tension of the belt is not directly applied to the bearing of the motor casing.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1 and 2.

2 is a platen that holds printing paper. 3 is a carriage, on which the print head 1 is mounted in front of the platen 2;
Move left or right. 11 and 12 are guide shafts that support the carriage 3. A belt 10 is fixed to the carriage 3 and wound around a driven pulley 5 and a driving pulley 6. The driving pulley 6 is fixed to a motor shaft 22.

The motor shaft 22 extends downward from the motor casing 21a, and its extending portions 22a and 22b are supported by bearings 7 and 8 that are separate from the bearings 23 and 24 of the motor casing. The bearings 7 and 8 are sliding bearings and are attached to the support plate 13. Therefore, the motor 21 is
The tension of the helmet 10 is received by the motor runcier 25 via the bearings 7 and 8 and the support plate 13. Therefore, the tension of the belt 10 does not directly affect the bearings 22 and 23 of the motor casing.

〔Effect of the invention〕

As described above, according to the present invention, the motor bearing can be changed from a rolling bearing with a complicated mechanism and a high curvature to a simple and inexpensive 71 weight bearing, and the belt tension can be set regardless of the motor bearing. It has the effect of being able to 4

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention. FIG. 2 is a sectional view showing the motor section same as above. FIG. 3 is a perspective view showing the 1F model. No. 41A is a sectional view showing the motor part of the FLR example. 3... Carriage 5... Driven pulley 6... Drive pulley 7 8...Bearing 9...Printer frame lO...Belt 11.12...Guide shaft 13...Support plate 21...Motor 22...Motor shaft 23.24...Beyond the motor casing bearing

Claims (1)

[Claims] A carriage that carries the print head in front of the platen that holds the print paper and moves from side to side, a guide shaft that supports this carriage, and a drive pulley that is fixed to the carriage and is fixed to a driven pulley and a motor shaft. A carriage mechanism for a printer, characterized in that the motor shaft extends from a motor casing, and the extended portion is supported by a bearing different from a bearing of the motor casing. .