JPS6316923Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for reciprocating a driven member in a direction orthogonal to the direction of movement by reciprocating linear movement of a movable member.

Conventionally, in small and simple printers, a paper feeding mechanism has been proposed in which paper feeding power is derived from the reciprocating movement of a carriage of a printing head. This paper feeding mechanism uses the movement of a carriage in the row direction to feed paper by reciprocating a driven plate to which a one-way friction member that contacts the paper is attached in a direction perpendicular to the row direction.

Figure 1 shows an example of a reciprocating mechanism used in such a paper feeding mechanism, and Figure 2 shows an example of a reciprocating mechanism used in such a paper feeding mechanism.
It is a sectional view taken along line AA' in the figure.

In FIGS. 1 and 2, a movable member 1 such as a carriage is moved in both left and right directions along a guide shaft 3 by the rotation of a drive shaft 2 provided with two types of spiral grooves, clockwise and counterclockwise. Two grooves 4 and 5 are provided in the bottom of the movable member 1, one of which is oblique to the direction of movement of the movable member 1. Below the movement path of the movable member 1, a "T"-shaped driven plate 6 is located in the recess 7 of the guide plate 7.
A is movably installed on the driven plate 6.
Guide posts 6a and 6b extending from the bottom of the recess 7a are respectively fitted into guide holes 7b and 7c provided in the recess 7a. Further, two rails 8 and 9 are provided on the front upper surface of this driven plate 6 along the direction of movement of the movable member 1, and one rail 9 is provided at the same angle as the groove 4 in the direction of movement of the movable member 1. It is oblique to the These two rails 8 and 9 are positioned so that they can fit into the grooves 4 and 5 when the movable member 1 moves.

In the above configuration, when the movable member 1 moves rightward from the illustrated position, one rail 9 of the driven plate 6 fits into the groove 4, and at the same time, the other rail 8
comes out of groove 5. When the movable member 1 moves further, the driven plate 6 moves in the direction of arrow a due to a component of the force received from the movable member 1 in the perpendicular direction since the rail 9 is provided obliquely to the direction of movement. do. When the movable member 1 reaches the right limit position, the drive shaft 2 now rotates in the opposite direction and the movable member 1 moves to the left towards the initial position.
While the movable member 1 passes through the rail 9
receives a component force from the movable member 1 in the opposite direction to the above component force, so the driven plate 6 moves in the direction of arrow b, the rail 9 comes off from the groove 4, and at the same time the rail 9 fits into the other groove 5. Sometimes it returns to the initial position indicated by the solid line in the figure.

Install two rails on the driven member in this way,
A reciprocating driven mechanism in which one of the rails is provided obliquely to the direction of movement of the movable member and the movable member is transferred between the two rails has the advantage of being simple and inexpensive.

However, in the reciprocating driven mechanism configured as described above, the movement range of the movable member that operates the driven member is limited, and this range corresponds to the vicinity of the end of the driven member rather than the center. When the driven member is moved, a force that attempts to rotate the driven member acts in addition to a force in the moving direction.
Therefore, even if the driven member is guided and supported by the guide means such as the guide plate 7, there is a drawback that the driven member swings by the amount of play between the driven member and the guide means during its movement.

The present invention aims to eliminate the above-mentioned drawbacks, and will be described in detail below with reference to the drawings.

Figure 3 shows one embodiment of the present invention.
Components that are the same as in the figures are given the same numbers.

In FIG. 3, there are three rails 1 on the driven plate 6.
0, 11, and 12 are provided along the direction of movement of the movable member 1, and of these, the rail 11 provided at the center of the driven plate 6 is provided diagonally as shown in the figure with respect to the direction of movement of the movable member 1. ing. The movable member 1 is provided with three grooves 13, 14 and 15 on the bottom facing the driven plate 6 as shown in FIG. It is placed diagonally.

In the above configuration, the rail 10 is fitted into the groove 13 when the movable member 1 is at the initial position. As the movable member 1 moves to the right, the rail 10 will eventually come off the groove 13 and at the same time the rail 11 will come off the groove 14.
are mated. If the movable member 1 continues to move, the driven plate 6 will be moved in the direction of the arrow a, as in the case of FIG. 1 described above, since the rail 11 is provided diagonally. At this time, the force acting on the driven plate 6, that is, the perpendicular component of the force received from the movable member 1, acts on the approximately central portion of the driven plate 6, so the point of application and the rotation fulcrum of the driven plate 6 (first The distance between the guide posts 6a and 6b (located on a line passing through the centers of the guide posts 6a and 6b shown in the figure) is extremely short. Therefore, the rotational moment acting on the driven plate 6 is much smaller than in the conventional case, and the driven plate 6 does not swing during its movement. When the movable member 1 moves further to the right, the groove 14
At the same time as the rail 11 is removed from the groove 15, the rail 12 is fitted into the groove 15, and the movement of the driven plate 6 is stopped and the driven plate 6 is held at the same position. When the movable member 1 reaches the right limit position and moves to the left toward the initial position, the rail 12 is removed from the groove 15 again and at the same time the rail 11 is fitted into the groove 14. While the movable member 1 passes through this rail 11, the driven plate 6 is also moved in the direction of the arrow b, as in FIG. Also at this time, almost no rotational moment is generated in the driven plate 6, so that it does not swing during its movement. When the movable member 1 passes the rail 11, the driven plate 6 returns to the initial position again, and the rail 10 fits into the groove 13 again.

In this embodiment, the diagonal rail 11 is installed at the center of the driven plate 6, that is, in the middle of the movement section of the movable member. It may be installed in any section.

Further, the number of rails installed on the driven member is at least three, and may be even more than the number of rails in the above embodiment.

As described above, according to the present invention, the driven member can be operated in any section of the reciprocating stroke of the movable member, and the direction of its operation can be changed. Furthermore, there is an effect that the operation can be performed in the most optimal interval in terms of the operational balance of the driven member.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional example, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, Fig. 3 is a plan view showing an embodiment of the present invention, and Fig. 4 is a movable view shown in Fig. 3. It is a side view showing a member. 1... Movable member, 6... Followed plate, 10, 11,
12...Rail, 13,14,15...Groove.

Claims (1)

[Claims for Utility Model Registration] A mechanism for reciprocating a driven member whose central portion is guided by reciprocating linear motion of a movable member in a direction perpendicular to the direction of movement, the mechanism comprising: At least three rails are provided on the surface of the driven member, and the rail located in the center of the surface is provided obliquely to the direction of movement of the movable member, and the rail is provided on both sides of the rail located in the center. rails are provided parallel to the direction of movement of the movable member, further, the intervals between the rails in this direction of movement correspond to the width of the movable member in the direction of movement, and the side of the movable member facing the driven member A reciprocating driven mechanism, characterized in that the reciprocating driven mechanism is provided with at least three grooves into which the rails fit.