JPH04152178A - Carriage for printer device - Google Patents

Abstract

PURPOSE:To make the consumption of ink appropriate, and reduce the quantity of waste ink by changing the running quantity of the ribbon fabric to the moving quantity of the carriage, in response to the density of printing characters. CONSTITUTION:The rotation of a running force transmitting shaft 1 becomes the driving force of a ribbon fabric 7 which is stored in an ink ribbon cassette 6 installed in a carriage 2. When characters with high density are printed, a switch 9 is closed, and a coil 10 is operated. A permanent magnet 11 is drawn and lowered, and a belt moving arm 12 moves downward while resisting the force of a spring 13. A belt 14 which is wound on the conical surfaces, which are provided at the tips of the running force transmitting shaft 1 and a transmission gear 5a in the mutually opposite directions, is pushed downward, and the rotational ratio from the transmission gear 5a to the running force transmitting shaft 1 becomes larger. When characters with low density are printed, the switch 9 is opened, the permanent magnet 11 is raised by the force of the spring 13, and the belt moving arm 12 also moves upward. Therefore, the belt 14 is also raised, and the rotational ratio from the transmission gear 5a to the running force transmitting shaft 1 becomes smaller.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a carriage of a printer device used as an output device of an information processing device, and in particular, a carriage equipped with a print head and an ink ribbon cassette and driven by a positioning motor. The present invention relates to a carriage of a printer apparatus that reciprocates in parallel with a platen by a power transmission means that engages with a gear fixed to the shaft of a positioning motor.

[Conventional technology]

Among printer devices used as output devices of information processing devices, in particular, a power transmission device that is equipped with a print head and an ink ribbon cassette, is driven by a positioning motor, and engages with a gear fixed to the shaft of the positioning motor. A conventional carriage of a printer device that reciprocates parallel to the platen by a means is disposed in front of the carriage to restrict its forward and vertical movement when reciprocating left and right parallel to the platen. A pair of planetary gears mesh with the ink ribbon rack to provide power in a fixed direction to the ribbon cloth in the ink ribbon cassette, even when the carriage is moving left or right. A rotational force in a fixed direction is applied to the running force transmission shaft through one of the transmission gears, and the transmission ratio of rotation from the transmission gear to the running force transmission shaft at that time is constant.

[Problem to be solved by the invention]

The carriage of the conventional printer device described above has the same rotational speed of the running force transmission shaft, regardless of whether it is printing dense characters or thin characters, as long as the carriage moves the same amount. are the same, and in the case of a multi-strike ribbon, the running of the film coated with ink is driven by the constant rotation of this running force transmission shaft, so
When printing characters with low density, the amount of ink consumed is small, so there is a disadvantage that a large amount of ink is wasted.

[Means to solve the problem]

The carriage of the printer device of the present invention is mounted with a print head and an ink ribbon cassette, and is driven by a positioning motor to reciprocate in parallel to the printer, from a rack provided at the front of the main body of the printer device. A planetary gear that receives rotational force, a pair of transmission gears that mesh at respective positions when the planetary gear moves left and right, and a ribbon in the ink ribbon cassette from one transmission gear of the pair of transmission gears via a belt. a running force transmission shaft that applies a running force in a fixed direction to the cloth, contact surfaces of the transmission gear and the running force transmission shaft with the belt have conical surfaces in opposite directions, and the belt is provided with a spring. and a belt moving arm that moves in the vertical direction by an electromagnet, and is held by a belt moving arm to vary the transmission ratio of rotation from the transmission gear to the running force transmission shaft,
In particular, the operation of the electromagnet can be controlled via a switch.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention.

In FIG. 1, a running force transmission shaft 1 that transmits running force to the ribbon cloth is arranged so that a carriage 2, which carries a print head 8 and an ink ribbon cassette 6 and is driven by a positioning motor (not shown), is parallel to a platen. When reciprocating from side to side, the power is received from the rack 3 provided at the front of the printer main body, and the planetary gear 4 held at the tip of the planetary arm 15, and when the planetary gear 4 moves from side to side, each Due to the action of a pair of transmission gears 5a and 5b that mesh at certain positions, it always rotates only in a fixed direction. This rotation of the running force transmission shaft 1 becomes a driving force for the ribbon cloth 7 housed in the ink ribbon cassette 6 mounted on the carriage 2.

2(a) and 2(b) are side views of the inside of the embodiment shown in FIG. 1 as viewed from the direction of the rack; FIG. 2(a) is a view showing the state when the switch is closed; Figure (b) shows the state when the switch is open.

FIG. 2(a) shows the state when printing dense characters, in which case the switch 9 is closed and the coil 10 is
make it work. As a result, the permanent magnet 11 is attracted and moves downward, and the belt moving arm 12 coupled to the permanent magnet 11 moves downward against the force of the spring 13. As a result, the belt 14, which is wound around the conical surfaces provided in opposite directions at the tips of the running force transmission shaft 1 and the transmission gear 5a, is pushed downward and the transmission gear 5a is pushed down.
The rotation ratio from the running force transmission shaft 1 to the running force transmission shaft 1 increases.

FIG. 2(b) shows a state when printing characters with a low density. In this case, the switch 9 is opened, and the force of the permanent magnet 11 and the spring 13 causes the characters to rise upward.
The belt moving arm 12, which is connected to the permanent magnet 11, also moves upwards.

Therefore, the belt 14 is also lifted upward, and the rotation ratio from the transmission gear 5a to the running force transmission shaft 1 becomes smaller.

〔Effect of the invention〕

As explained above, the carriage of the printer device of the present invention adjusts the amount of ink consumed and reduces the amount of wasted ink by changing the amount of travel of the ribbon cloth relative to the amount of movement of the carriage depending on the density of printed characters. The effect is that it can be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2(a)
2(b) is a side view of the inside of the embodiment shown in FIG. 1 viewed from the direction of the rack, FIG. 2(a) is a diagram showing the state when the switch is closed, and FIG. It is a figure which shows the state when it is open. 1.--Travel force transmission shaft, 2.--Carriage, 3.--Rack, 4.--Planetary gear,
5a, 5b...Transmission gear, 6...-Ink ribbon cassette, 7...Ribbon cloth, 8...
-・-Print head, 9...--Switch, 10
...... Coil, 11 ... Permanent magnet, 12
...Belt moving arm, 13...Spring, 14...Belt, 5...Planetary arm.

Claims (1)

[Scope of Claims] 1. A rack provided at the front of the main body of the printer in a carriage of a printer equipped with a print head and an ink ribbon cassette and driven by a positioning motor to reciprocate in parallel to the platen. a planetary gear that receives rotational force from the ink ribbon cassette; a pair of transmission gears that mesh at respective positions when the planetary gear moves left and right; a running force transmission shaft that applies a running force in a certain direction to the ribbon cloth; contact surfaces of the transmission gear and the running force transmission shaft with the belt have conical surfaces in opposite directions; 1. A carriage for a printer apparatus, wherein the carriage is held by a belt moving arm that moves in the vertical direction by a spring and an electromagnet, and the transmission ratio of rotation from the transmission gear to the running force transmission shaft is variable. 2. In the carriage of a printer device that is equipped with a print head and an ink ribbon cassette and is driven by a positioning motor to reciprocate in parallel to the platen, a planetary gear and , a pair of transmission gears that mesh at respective positions when the planetary gear moves left and right, and a transmission gear that is transmitted in a fixed direction from one of the transmission gears to the ribbon cloth in the ink ribbon cassette via a belt. a running force transmission shaft that provides a running force, contact surfaces of the transmission gear and the running force transmission shaft with the belt have conical surfaces in opposite directions, and the belt is rotated in the vertical direction by a spring and an electromagnet. The printer apparatus is held by a belt moving arm that moves to make the transmission ratio of rotation from the transmission gear to the running force transmission shaft variable, and the operation of the electromagnet can be controlled via a switch. carriage.