JPH029964Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Technical field of the invention The present invention is a belt that facilitates the position adjustment of an endless type belt running between two crown pulleys in the direction of the rotation axis of the crown pulleys. Regarding line printers.

(B) Background of the technology In type belt type line printers, type is provided on an endless belt made of steel by a method such as etching, and the type is stretched between two pulleys and run. However, generally, by using a crown pulley as the pulley, the belt running position with respect to the pulley rotation axis direction is kept constant.

The type belt has type on one side in the width direction and a signal detection mark for type identification on the other side, and since only the type side is frequently hit by the hammer, A difference occurs between the belt length at the end edge and the belt length at the end edge on the signal detection mark side, which causes the running center line of the type belt to be deviated in the direction of the rotation axis of the crown pulley.

Needless to say, the unevenness of the type belt causes a drop in print quality. Therefore, in type belt type line printers, one of the crown pulleys is usually constructed to be movable in the direction of the rotation axis, and its fineness is reduced. The adjustment adjusts the running position of the type belt with respect to the crown pulley rotating shaft direction.

In addition, the type belt type line printer is equipped with a direct-view type or other detection device for detecting the type belt running position relative to the crown pulley rotation axis in order to facilitate adjustment of the type belt running position relative to the crown pulley rotation axis. It is being

(C) Prior art and problems In type belt line printers in which the running position of the type belt in the direction of the rotation axis of the crown pulley is adjusted by moving one of the crown pulleys in the direction of its rotation axis, the type belt Moving one of the crown pulleys while the crown pulley is stopped will only tilt the type belt in the running direction; in order to move the entire type belt, it is necessary to move the type belt while or after the crown pulley is moving. There is.

At this time, the type belt moves parallel to the movement direction of one of the crown pulleys by half of the movement direction. Conventionally, a detector for detecting the type belt traveling position is provided at an arbitrary position on the type belt traveling path. Therefore, in order to confirm the amount of parallel movement of the type belt using the detector, there is a risk or inconvenience that the type belt must run during or after the movement of the crown pulley. Ta.

(D) Purpose of the invention The purpose of the present invention is to solve the problems in the conventional example, that is, to provide a type belt type line printer that does not require the type belt to run when adjusting the running position of the type belt.

(E) Structure of the invention The type belt type line printer of this invention is
A first crown pulley provided so as to be immovable in the direction of the rotation axis, a second crown pulley provided movably in the direction of the rotation axis, and between the first crown pulley and the second crown pulley. It includes an endless type belt stretched in tension, and a detector that detects the position of the type belt with respect to the rotational axis direction at a central position in the longitudinal direction of the type belt when the stretched type belt stops running. It is something.

(F) Embodiments of the invention The gist of the invention will be specifically explained below using illustrated embodiments.

FIG. 1 shows the structure of an embodiment of the present invention with a plan view a and a front view b, in which 1 is a first crowned pulley that is provided immovably in the direction of the rotation axis;
3 is a second crown pulley that is movable in the direction of the rotational axis and is provided parallel to the first crown pulley 1 and has the same diameter as the first crown pulley 1; 3 is the first crown pulley 1 and the second crown pulley. 2, an endless type belt 4 is provided at a position equidistant from the rotation axis of the first crown pulley 1 and the rotation axis of the second crown pulley 2, and the type belt 4 is provided at a position equidistant from the rotation axis of the first crown pulley 1 and the rotation axis of the second crown pulley 2. 5 is a print hammer, 6 is a platen, 7 is a stand, 2-1 and 2-2 are knobs and screws used to move the second crown pulley in the direction of the rotation axis. be.

In the above structure, as shown in FIG. 2a, the first crown pulley 1 and the second crown pulley 2 are on the same plane, and the plane coincides with the center line of the type belt 3 in the running direction. In this state, the crown pulley 1, the crown pulley 2, and the type belt 3 are assumed to be in a dynamically balanced state.

When the second crown pulley 2 is moved upward by a length of A as shown in FIG. 2b while the type belt 3 is stopped in such a related position, the type belt 3
moves upward along with the crown pulley 2 by the same length A on the outermost side of the second crown pulley 2,
At this time, the type belt moves upward by a length of 1/2 A at the position where the detector 4 is provided.

After this, when the type belt 3 is run, the second
As shown in FIG. Move to.

That is, the position of the type belt 3 detected by the detector 4 in the state shown in FIG. 2B is equal to the position of the type belt 3 detected by the detector 4 in the state shown in FIG. 2C, Therefore, the moving length of the type belt 3 can be confirmed without causing the type belt 3 to travel.

(G) Effect of the invention As explained above, according to the invention, the type belt is stretched between two crown pulleys, and the running position of the type belt is adjusted by moving one of the crown pulleys in the direction of the rotation axis. In type belt type line printers, there is no need to run the type belt when adjusting the running position of the type belt.
Work can be done safely and easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the effects of the embodiment. In these figures, 1 is a first crown pulley, 2 is a second crown pulley, 3 is a type belt, and 4 is a detector.

Claims (1)

[Scope of utility model registration request] A first crown pulley provided so as to be immovable in the direction of the rotation axis, a second crown pulley provided movably in the direction of the rotation axis, and between the first crown pulley and the second crown pulley. An endless type belt stretched in tension, and a detector for detecting the position of the type belt with respect to the rotating shaft direction at a central position in the longitudinal direction of the type belt when the stretched type belt stops running. A type belt type line printer featuring the following.