JPS6030260Y2 - feeding mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a feeding mechanism, for example, a printing medium feeding mechanism.
In particular, it relates to a feeding mechanism using an electromagnetic mechanism such as a plunge type magnet as a driving source.

The feed mechanism using the plunger magnet as a driving source uses a ratchet mechanism using gears and pawls to change the reciprocating linear motion of the plunger magnet into rotational motion.

Therefore, the transferred object is subjected to force only when the magnet is moving forward or backward, but this makes it impossible to eliminate the drawbacks described below.

When the print medium 12 is fed by a pair of rollers lla and llb as shown in FIG. There is not much problem even if the paper is rotated, but if paper with different widths such as the printing paper 13 is to be transferred, in the case of the printing paper 13, the rollers lla,
Ilb intermittent movement causes skewing.

The present invention was made to eliminate such drawbacks,
This will be explained in detail below with reference to FIG.

In FIG. 2, 20 is an object to be transported such as printing paper, 21
a is a pinch roller, 21b is a drive roller, 22 is a first gear, 23 is a second gear, 24 is a flywheel (
25 is a lever, 26 is a plunger magnet, 27 is a spring, and 28 is a detent mechanism.

The pinch roller 21a1 and the drive roller 21b pinch the printing paper 20, and the rotation of the drive roller 21b transports the printing paper 20 as shown by the arrow.

The drive roller 21b and the first gear 22 are rotatable on a concentric axis, and the first gear 22 meshes with the second gear 23.

The second gear 23 and the flywheel 24 are rotatable on a concentric axis, and a notch is provided in a part of the circumferential surface thereof.

The butent roller 28a of the detent mechanism 28 is a kind of cam follower that comes into contact with the circumferential surface of the flywheel 24, and the butent roller 28a is configured to always contact the circumferential surface by the detent 28b1 and the detent spring 28c.

One end of the lever 25 is pivotally supported in the flywheel 24,
The other end is the plunger 26 of the plunger magnet 26
It is pivotally supported at one end of a.

The spring 27 has one end fixed to the plunger 26a and the other end fixed to the case, and as the plunger 26a moves to the right due to the excitation of the plunger magnet 26, it is deformed (compressed in this case) along with this movement. When the excitation is stopped, the plunger 26a moves to the left due to the restoring force (in this case, expansion) of the spring 27.

The reciprocating direction of the plunger 26a is determined by the flywheel 24.
It is preferable that the rotation center of the lever 25 be in the extending direction of a straight line connecting the pivot point of the lever 25 with respect to the plunger 26a.

To explain the operation, it is assumed that when the plunger magnet 26 is in a non-energized state, the plunger 26a is at the left dead center, and in that case, the butent roller 28a is fitted into a notch provided in the flywheel 24. .

When the plunger magnet 26 is energized, the plunger 26a moves rightward in the figure and the spring 27 is compressed.

Along with this, the flywheel 24 rotates counterclockwise, so the drive roller 21b rotates clockwise and transports the printing paper 20 in the direction of the arrow.

The plunger magnet 26 is excited by the flywheel 24.
It is preferable that the pivot point of the lever 25 continues to extend to the extension line of the center of movement of the plunger 26a, but it may be stopped before that point.

Since the flywheel 24 tends to continue rotating counterclockwise due to inertia, even after the excitation of the plunger magnet 26 is stopped, the plunger 26a is moved to the right and exceeds the right dead center.

That is, the pivot point of the lever 25 relative to the flywheel 24 exceeds the center line of movement of the plunger 26a.

Thereafter, the restoring force of the spring 27 causes the flywheel 24 to rotate counterclockwise.

When the flywheel 24 rotates once, the butent roller 28a again fits into the notch and is stopped and positioned.

If continuous rotation is desired, excitation of the plunger magnet 26 is restarted after the pivot point of the lever 25 relative to the flywheel 24 passes through point A.

As explained above, according to the present invention, the object to be transported can be continuously sent using the electromagnetic mechanism, and defects such as skew can be eliminated.

[Brief explanation of the drawing]

FIG. 1 shows an example of transporting printing paper using a pair of rollers, and FIG. 2 shows a transport mechanism according to the present invention. In the figure, 21b is a drive roller, 24 is a flywheel, 26 is a plunger magnet, 27 is a spring, 2
5 is a lever, and 28 is a detent mechanism.

Claims (1)

[Scope of utility model registration request] It consists of an electromagnet mechanism, a lever having one end pivotally supported by a movable core of the electromagnet mechanism and the other end pivotally supported by a rotating body, and a spring wound around the movable core, and the rotating body has a lever on its circumferential surface. A notch is provided and a detent mechanism is slidably fitted into the notch, and by energizing the electromagnetic mechanism, the rotating body is rotated via the lever while deforming the spring, and then The excitation is released and the rotating body is rotated in the same direction by the restoring force of the spring, and this rotational position is rotated one round to the rotational position where the detent mechanism part fits into the notch, or the excitation and release are completed. A feeding mechanism characterized by repeating a cycle to make an integer multiple of revolutions.