JP2895019B2 - Serial printer anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for a serial printer, and more particularly, to an anti-vibration device for a serial printer which suppresses lateral vibration of a main body.

[0002]

2. Description of the Related Art In a serial printer, a force for moving a carrier on which a printing mechanism such as a hammer is mounted is applied to the main body in the opposite direction as it is and attempts to move the main body. However, since the printer body is placed on a desk or the like via rubber feet or the like, the printer body vibrates. In particular, in the case of a print type serial printer, for example, since the carrier stops for each character, the force on the printer main body largely acts as vibration. The vibration of the printer body is also transmitted to peripheral parts such as a desk.

A conventional image stabilizing device for a serial printer will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram showing an example of the related art.
In the anti-vibration device of the serial printer shown in FIG. 2, an additional movable portion 6 having the same weight as the carrier 1 is connected to a side of the loop wire opposite to the carrier 1. (See, for example, Japanese Patent Application Laid-Open No. 62-70069) Tensions F1, F2, F3, and F4 are generated on the wire 5, respectively. The carrier 1 moves by the difference F1-F2 in the force applied to the carrier 1, and the additional movable part 6 moves by the difference F3-F4 in the tension. At this time, assuming that the wire 5 does not extend, the movement of the carrier 1 and the movement of the additional movable portion 6 are opposite in direction and have the same speed. Further, since the weight of the carrier 1 and the weight of the additional movable portion 6 are the same, F1-F2 = F3-F4 (1) holds. The forces applied to the pulleys 3 and 4 are F1 + F4 and F3 + F5, respectively. Therefore, the lateral force applied to the printer body is (F1 + F4) − (F3 +
F4), and this force becomes 0 according to the equation (1). In other words, the provision of the additional movable portion 6 having the same weight as the carrier 1 cancels out the force of the printer body moving due to the recoil of the moving force of the carrier 1 and does not apply any force to the printer body. Become.

[0005]

In the above-described conventional vibration damping device for a serial printer, since the additional movable portion is mechanically driven by a belt, the weight of the carrier (including the print head) at the time of manufacture is reduced. Since it is difficult to completely cancel variations in acceleration due to friction loss or the like when an ink ribbon or the like is mounted, there is a disadvantage that vibration remains.

[0006]

According to a first aspect of the present invention, a vibration isolator of a serial printer is fitted on a print shaft and is provided in a direction A.
Or, a carrier mounted with a first acceleration sensor that detects acceleration during traveling and outputs a first acceleration signal while traveling in the direction B, and a balancer shaft installed near the print shaft and parallel to the print shaft. A balance weight fitted to the balancer shaft and capable of traveling in the direction A or the direction B; and a second acceleration sensor mounted on the balance weight and detecting acceleration during traveling and outputting a second acceleration signal. A carrier control unit that outputs a traveling direction signal that specifies a traveling direction of the carrier, a carrier driving circuit that causes the carrier to travel in a direction designated by the traveling direction signal, the first acceleration signal, and the first 2 based on the acceleration signal and the traveling direction signal, the balance weight specified by the traveling direction signal. And caused to travel in opposite directions, a balancer control unit acceleration of the balance weight to output a control signal equal to the acceleration of the carrier,
A balance weight drive circuit for driving the balance weight based on the control signal.

According to a second aspect of the present invention, in the image stabilizing apparatus for a serial printer according to the first aspect, a piezoelectric element is used as the first and second acceleration sensors.

[0008]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The vibration isolator of the serial printer shown in FIG.
A carrier 10 mounted with an acceleration sensor 11 that is fitted to the printing shaft 40, travels in the direction A or the direction B, detects acceleration during traveling, and outputs an acceleration signal c, and a printing shaft 40 near the printing shaft 40. A balancer shaft 50 installed in parallel, a balance weight 60 fitted to the balancer shaft 50 and capable of traveling in the direction A or B, and mounted on the balance weight 60 to detect acceleration during traveling and output an acceleration signal d. An acceleration sensor 61, a carrier control unit 12 for outputting a traveling direction signal e for designating a traveling direction of the carrier 10, a carrier driving circuit 13 for traveling the carrier 10 in a direction designated by the traveling direction signal e, an acceleration signal Based on c, acceleration signal d, and traveling direction signal e, balance weight 60 is changed to traveling direction signal e. Ri and given direction to travel in the opposite direction, the acceleration of the balance weight 60 is carrier 10
And a balance weight drive circuit 30 for driving a balance weight 60 based on the control signal f.
It is comprised including.

It is conceivable to use a piezoelectric element as the acceleration sensors 11 and 61.

[0011]

According to the vibration isolator of the serial printer of the present invention, the acceleration of the carrier is detected and the acceleration of the balance weight is controlled by the detection signal, so that the vibration of the printer body can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Carrier 11 Acceleration sensor 12 Carrier control part 13 Carrier drive circuit 20 Balancer control part 30 Balance weight drive circuit 40 Printing shaft 50 Balancer shaft 60 Balance weight 61 Acceleration sensor

Claims (2)

(57) [Claims] A carrier mounted with a first acceleration sensor that is fitted to a print shaft, travels in a direction A or a direction B, detects acceleration during travel and outputs a first acceleration signal, and the print shaft. , A balancer shaft installed in parallel with the printing shaft, a balance weight fitted to the balancer shaft and capable of traveling in the direction A or the direction B, and mounted on the balance weight to detect acceleration during traveling. A second acceleration sensor that outputs a second acceleration signal, a carrier control unit that outputs a traveling direction signal that designates a traveling direction of the carrier, and causes the carrier to travel in a direction designated by the traveling direction signal. A carrier driving circuit; and the balancer based on the first acceleration signal, the second acceleration signal, and the traveling direction signal. A balancer control unit that causes the eight to travel in a direction opposite to the direction specified by the traveling direction signal, and outputs a control signal such that the acceleration of the balance weight is equal to the acceleration of the carrier, based on the control signal And a balance weight drive circuit for driving the balance weight. 2. An anti-vibration device for a serial printer according to claim 1, wherein a piezoelectric element is used as said first and second acceleration sensors.