JPH03227678A - Belt tension regulating mechanism of serial printer - Google Patents

Abstract

PURPOSE:To easily regulate the tension of a belt to a predetermined value by providing a spring which is connected to a stay and a tension bracket to apply a tension to the ring-form belt through a drive pulley. CONSTITUTION:A tension bracket 11 is held on a stay 7 with bushes 12. As mounting holes through which the bushes 12 are inserted, the stay 7 is provided with a hole 7a and a circular slot 7b. The stay 7 is so structured as to rotate about the hole 7a in the range of the longer-diameter of the other slot 7b. On the other end of the stay 7, a driven pulley 10 is mounted through a shaft 17. A belt 9 is set to the driven pulley 10 and a drive pulley 14. A receiving part 11a provided on the end of the tension bracket 11 and a receiving part 7c of the stay 7 are pulled by a spring 13, whereby the drive pulley 14 rotates to apply a predetermined tension to the belt 9 through the tension bracket 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a belt tension adjustment mechanism for a serial printer (hereinafter referred to as printer), and particularly relates to an improvement of the belt tension adjustment mechanism.

[Conventional technology]

Conventionally, the belt tension adjustment mechanism of this type of printer has a third
As shown in the figure, one of the left and right side frames 15 has a motor 8 having a drive pulley 14, and the other side has a driven pulley 10, and one of the motor 8 or the driven pulley lO is fixed, Others have a structure in which the tension of the belt 9 is adjusted by changing the position between the motor shaft and the driven booby shaft.

[Problem to be solved by the invention]

In the belt tension adjustment mechanism of the conventional printer described above, the length of the belt 9 is originally not made with high accuracy, and the accuracy of the distance between the left and right side frames 15 and 16 also varies due to deflection, etc. If both the motor 8 and the shaft of the driven pulley IO are fixed, there is a drawback that it becomes difficult to obtain the belt tension necessary to maintain printing quality. Further, one of the shafts of the motor 8 and the driven pulley 10 is fixed, and the other is adjusted by changing its position until the tension of the belt 9 reaches a predetermined value.
Since it has to be fixed, it has the disadvantage that it takes a long time to assemble the printer.

[Means to solve the problem]

The present invention includes a carrier on which a print head and an ink ribbon cartridge are mounted, an annular belt to which the carrier is fixed, and a drive motor having a drive pulley for driving the annular belt.

A belt tension adjustment mechanism for a printer that performs a printing operation while reciprocating along a platen includes a stay provided parallel to the platen, and a driven pulley that rotatably holds the annular belt near one end of the stay. ,
a tension bracket that holds the drive motor and has a mounting hole that serves as a fulcrum, a fastening component that rotatably holds the tension bracket near the other end of the stay, and the stay and the tension bracket. and a spring connected to the annular belt and applying tension to the annular belt via the drive pulley.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a belt tension adjustment mechanism for a one-linter according to the present invention. In FIG. 1, this embodiment shows a print head 1. Career 2. Guide shaft 3/4. Stayer, motor 8. Belt 9, driven pulley 10. It consists of side frames 15 and 16 and screws 21, and the structure and arrangement thereof are the same as in the conventional embodiment.

FIG. 2 is a partially exploded perspective view of FIG. 1. In FIG. 2, a motor 8 directly connected to a drive pulley 14 that drives a belt 9 is connected to a tension bracket 11 and a bush 12.
A stayer is interposed between the tension bracket 11 and the tension bracket 11, and the stayer is fixed to one end of the stayer by two sets of bushings and 2° screws 21.

This tension bracket 11 is held on the stayer by a bushing 12, and the holes through which the bushing 12 passes through for installing the steerer are hole 7a and an elongated hole 7 drawn in an arc.
b, and has a structure that can rotate by the length of one elongated hole 7b with the hole 7a as the center of rotation. Further, a driven pulley lO is attached to the other end of the steerer via a shaft 17. The belt 9 is attached to the driven pulley 10 and the drive pulley 14, and the receiver provided at the end of the tension bracket 11 is attached to the part a.
By pulling the stayer support portion 7C with the spring 13, the drive pulley 14 rotates via the tension bracket 11 and applies a predetermined tension to the belt 9.

〔Effect of the invention〕

As explained above, according to the belt tension adjustment device for serial printers of the present invention, even if there are variations in the distance between the left and right side frames, the length of the belt, etc., the tension of the belt can be easily adjusted to a predetermined value. This has the effect of reducing costs by reducing the number of printer adjustment steps.

[Brief explanation of drawings]

Figure 1 shows the belt tension rJI of the serial printer of the present invention.
FIG. 2 is a perspective view showing a partial perspective development of FIG. 1, and FIG. 3 is a perspective view showing a conventional example. 1...Print head, 2...Carrier, 3.4...
Guide shaft, 7... Stay, 7a... Hole, 7b
...Elongated hole, 7c, Lla...Receiver, 8...Motor, 9...Belt, 10...Driven pulley,! l
...Tension bracket, 12...button,
+3... Spring, 14... Drive pulley, 1
5.16...Side frame, 17...Shaft,
21.22...Screw, 23...Driven bracket, 24...Motor bracket.

Claims (1)

[Claims] a carrier carrying a print head and an ink ribbon cartridge; a circular belt fixing the carrier;
A belt tension adjustment mechanism for a serial printer, which includes a drive motor having a drive pulley that drives the annular belt, and performs a printing operation while reciprocating along the platen, and a stay provided parallel to the platen;
A driven pulley that rotatably holds the annular belt near one end of the stay, a tension bracket that holds the drive motor and has a mounting hole that serves as a fulcrum, and a tension bracket near the other end of the stay. A belt tensioner for a serial printer, comprising: a fastening component that rotatably holds a bracket; and a spring that is connected to the stay and the tension bracket and applies tension to the annular belt via the drive pulley. Adjustment mechanism.