JPS61255882A - Carrier-driving device for serial printer - Google Patents

Abstract

PURPOSE:To automatically provide a spring material with a tensile strength to improve its durability and to prevent a positional deviation of a carrier by energizing a slider with a spring, and by forming inclined surfaces which press a supporting member towards outside of a frame against the surfaces where the slider and the supporting member face each other when the slider slides. CONSTITUTION:Since the slider 2 which is energized towards rear by a spring 4 pushes the supporting member 3 which can freely slide towards left by an inclined surface 5, the belt 6 is kept in tension. If the belt 6 stretches during prolonged use, the slider 2 gradually moves and pushes the supporting member 3 towards left by the force of the spring 4 correspondingly to stretching of the belt 6. The tensile strength of the spring 4 varies as its length changes: if the tensile strength is larger, the angle of the inclined surface 5 is large; but on the other hand, if the tensile strength reduces after the extent of the movement of the slider 2 was increased, the angle of the inclined surface reduces, therefore, the pressure against the supporting member 3 always remains constant, and an application of a further excessive tensile strength to the belt 6 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a carrier drive device for a serial printer.

Conventional technology In the past, a strip material such as a belt or wire, partially held by a carrier, was wound around multiple pulleys arranged on the left and right, one pulley was connected to a motor, and the other pulley was used as a support member to freely rotate. There is a carrier that is supported by a carrier and driven by a motor to move the carrier by the tensile force of the strip.

If the strip material stretches due to long-term use, the feed rate of the carrier will become inconsistent. In order to prevent this, there is a conventional example in which a support member 21 supporting a driven pulley 20 is held movably, and the support member 21 is fixed at an arbitrary position with a screw 22, as shown in FIG.

Another conventional example is one in which the support member that supports the driven pulley is biased by a spring to prevent the strip from loosening.

Problems to be Solved by the Invention Among the conventional examples mentioned above, in the former case, it is necessary to tighten the screw 22 while measuring the tension of the belt 23, and since the support member 21 is fixed, if the belt 23 stretches even a little, Each time, the screw 22 must be loosened and the position of the support member 21 must be determined again, and the tensioning operation is extremely troublesome due to frequent adjustments.

In the latter case, when the direction of movement of the carrier changes, the amount of deflection of the spring changes, and the position of the carrier differs between the forward and return trips.
Misalignment occurs in the printing position or erasing position.

This invention was made in view of these points, and can automatically apply tension to the strip material in accordance with the elongation of the strip material, and also improves the durability of the strip material.

An object of the present invention is to provide a carrier drive device for a serial printer that can prevent the carrier from being misaligned.

Means for Solving the Problems A slider 3 is provided on the frame 1 and comes into contact with a slidable support member 2, and this slider 3 is biased by a spring 4 and a An inclined surface 5 is formed that presses the support member 2 toward the outside of the frame 1 during the sliding operation of the slider 3.

By sliding the slider 3 little by little and moving the support member 2 little by little in accordance with the elongation of the working strip 6, just the right amount of tension is automatically applied to the strip 6. This prevents excessive tension from acting on the single strip material 6.
Let's extend the lifespan of.

Further, in a state where tension is applied to the single strip member 6, the slider 3 and the support member 2 maintain a stationary state.

Therefore, even if the moving direction of the carrier 7 changes, the strip 6 does not expand or contract, and the carrier 7 is prevented from being misaligned.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, a U-shaped support member 2 is fixed to the right frame 1, and a pulley 8 and a gear 9 integral with the pulley 8 are rotatably held at the tip of the support member 2. A drive gear 11 of a motor 10 is meshed with this gear 9.

Further, a U-shaped support member 2 is attached to the left frame l so as to be slidable in the left-right direction by being inserted through two insertion holes 12. A pulley 8 is rotatably held on this support member 2, and this pulley 8 and the above-mentioned pulley 8
A loop-shaped belt 6 serving as a strip material is wound around the. A portion of this belt 6 is attached to a carrier 7 that can freely reciprocate along the axial direction of the platen 13.

A slider 3 is provided that slides on the outer surface of the left frame l and contacts the support member 2. This slider 3 is biased backward (in the direction of arrow A) by a spring 4 as shown in FIG. An inclined surface 5 is formed so that it is inclined in a direction (direction) and is curved in such a manner that the angle of inclination with respect to the frame l becomes larger toward the rear. Further, the supporting member 2 is formed with the inclined surface 5 .

Further, a semicircular protrusion 14 that contacts the inclined surface 5 is formed on the support member 2 .

In such a configuration, as shown in FIG. 3(a),
The slider 3 urged backward by the spring 4 presses the slidable support member 2 leftward by the inclined surface 5, so that the belt 6 maintains its tensioned state. As the belt 6 stretches as the period of use becomes longer, the slider 3 is gradually moved in the direction of the arrow by the force of the spring 4 to support the belt 6 as shown in FIG. 3(b). Press member 2 little by little to the left. Therefore, just the right amount of tension is automatically applied to the belt 6, preventing excessive tension from acting on the belt 6, thereby extending the life of the belt 6. Moreover, the tensile force of the spring 4 differs depending on its length, but when the tensile force is strong, the slope of the inclined surface 5 is steep, and conversely, when the amount of movement of the slider 3 in the direction of the arrow increases and the tensile force is weak, Since the slope of the slope 5 becomes gentler,
The pressing force against the support member 2 is always maintained constant, further preventing excessive tension from being applied to the belt 6.

In addition, when tension is applied to the belt 6, the flap 1
Since the angle of inclination of the inclined surface 5 with respect to 11 is small, the slider 3 does not move against the tensile force of the spring 4 due to the tension of the belt 6. As a result, the support member 2 maintains a stationary state, so that even if the carrier 7 moves in a different direction, the belt 6 is prevented from expanding or contracting, and the carrier 7 is prevented from being misaligned.

Although the inclined surface 5 is formed on the slider 3 in this embodiment, it may be formed on the support member. In this case, the slope is formed so that the slope becomes steeper toward the front.

Effects of the Invention Since the present invention is constructed as described above, the slider slides and moves the support member little by little in accordance with the elongation of one strip, so that just the right amount of tension can be automatically applied to the strip. This allows you to:

The service life of the strip can be extended by eliminating excessive tension from acting on the strip, and when tension is applied to the strip, the tension of the strip can resist the force of the spring. Since the slider is maintained in a stationary state, the support member remains stationary, and even if the carrier moves in a different direction, the strip does not expand or contract, which has the effect of preventing the carrier from becoming misaligned. It is.

[Brief explanation of drawings]

Figures 1 to 3 (a) and (b) show one embodiment of the present invention, in which Figure 1 is a partially enlarged perspective view, Figure 2 is a perspective view, and Figure 3 ( FIGS. 4A and 4B are partially cutaway plan views showing the tensioned state of the belt, and FIG. 4 is a perspective view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Frame, 2... Support member, 3... Slider, 4... Spring, 5... Inclined surface, 6...
Belt (stripe material).

Claims (1)

[Claims] A plurality of pulleys for winding strips attached to a carrier are arranged at intervals in the left-right direction, and at least one of a plurality of support members rotatably holding these pulleys is aligned along the moving direction of the carrier. A slider is provided that is slidably attached to a frame, and that slides on the frame and comes into contact with the slidable support member, and this slider is biased by a spring, and the slider is mounted on the opposing surface of the slider and the support member. 1. A carrier drive device for a serial printer, characterized in that an inclined surface is formed to press the support member toward the outside of the frame during a sliding operation.