JPS58541Y2 - Printing device paper feed mechanism - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a paper feeding mechanism of a printing device.

A typical conventional paper feeding mechanism in a printing device is shown in FIG.

In the figure, printing paper 1 is transported by a pair of left and right paper feed tractors 5.
A and 5B send the paper in the direction of the white arrow toward the printing section (not shown).

The tractor shafts 3 of the paper feed tractors 5A and 5B are connected by a timing belt 11 to a timing gear 9 fixed to an output shaft 19 of a paper feed motor 7 via a timing gear 15 fixed to one end thereof.

The motor 7 is generally a step motor or
C, servo motors, etc. are used.

In this way, the paper 1 can be fed by a predetermined pitch in the direction of the arrow □.

Further, a fine adjustment housing 13 is connected to the end of the tractor shaft 3 via a clutch 17 such as a cone clamp.

For example, when it is necessary to fine-tune the printing position of the paper 1 in the paper feeding direction, this knob 13 is used to push the housing 13 inward to release the clap 11, thereby causing the clamp 13 to be attached to the tractor shaft 3. Since they are directly connected, by turning the knob 13, the tractor shaft 3 can be rotated by a predetermined amount regardless of the load on the motor 7.

However, in the conventional paper feeding mechanism as described above, it is not possible to adjust the paper position during the paper feeding operation, and it is essential to provide a clutch, which increases manufacturing costs, reduces operability, and provides high meshing accuracy. Problems such as the requirements of

SUMMARY OF THE INVENTION In order to satisfy these demands, it is an object of the present invention to provide a paper feeding mechanism with a simple structure that allows fine adjustment of the paper position even during paper feeding operation without providing a clap.

Hereinafter, preferred embodiments of the present invention will be described in detail.

As shown in FIG. 2, the tractor shaft 3 that pivotally supports the trough J5Aj5B is rotatably supported by a pair of support frames 27, 27' via bearings.

A timing gear 21 preferably having a housing 23 is fixed to one end of the tractor shaft 3 and is rotatable together with the tractor shaft 3.

A paper feed motor T for position indexing, such as a DC servo motor or a step motor, is rotatably attached to the support frame 27.

Therefore, at the four corners of the flange portion 7A of the bottom plate of the motor 7, bolts 41 extending through long arcs 35 (FIG. 3) of the frame 27 formed at the corresponding positions are attached via springs 39. Installed.

A hollow housing 43 having a handle 25 is attached to the opposite side of the motor 7, and the protruding end of the bolt 41 is screwed into a circular flange 43A at the bottom of the hollow housing 43 by a nut 47.

That is, the motor 7 and the hollow housing 43 are integrated with the frame 21 by bolts 41.

An output shaft (not shown) of the motor I extends through the plate 27 into the hollow housing 43, and a timing gear 31 is fixed to the end of the output shaft.

Timing gear 21 and timing gear 31 are interconnected via a timing belt 33.

Therefore, although not particularly shown in the drawings, the hollow housing 43 is formed with an elongated opening for the timing belt 33 to pass through.
This is to enable rotation of 3).

With the above configuration, by holding the handle 25 and rotating the hollow housing 43 clockwise or counterclockwise in FIG. 3, the main body of the motor 7 can be slid and rotated relative to the frame 27. be able to.

The amount of rotation is determined by the distance from one end of the bolt 41 to the other end of the elongated hole 35 formed in the frame 21.

Therefore, the bolt 41 and the elongated hole 35 constitute a so-called pin-elongated hole mechanism which is normally used to cause two parts to rotate relative to each other by a predetermined amount.

Further, since the motor 7 has a compression spring 39 wound around the bolt 41, it is normally strongly pressed against the frame 27 and can be frictionally maintained at the static value H.

Therefore, when the main body of the motor 7 is rotated by the handle 25, the main body of the motor 7 is caused to slide and rotate against the force of the spring 39.

By using the spring 39, there is no need for a locking mechanism to lock the bolt 41 each time.

When the main body of the motor 1 is rotated, its output shaft (not shown) and thus the timing gear 31 are also rotated, so that the timing gear 21 is rotated via the belt 33.

As a result, the tractor shaft 3 is rotated by a predetermined amount, making it possible to finely adjust the position of the printing paper 1 (FIG. 1) in the paper feeding direction.

The housing 23 is used for directly manually rotating the tractor shaft 3 when for some reason, for example, it is necessary to feed the paper 1 (Fig. 1) on a trial basis when the motor I is in the OFF state. It is something.

As described above, the present invention is characterized in that the paper feeding position of the paper is finely adjusted by directly rotating the main body of the paper feeding motor and shifting its mounting position.
This makes it possible to make adjustments during the paper feeding operation and eliminates the need for a conventional clap mechanism, making it possible to eliminate the drawbacks mentioned at the beginning.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a typical conventional paper feeding mechanism.
FIG. 2 is a front view of the paper feeding mechanism according to the present invention, and FIG. 3 is a right side view of FIG. 2. 1...Paper, 3...Tractor shaft, 5A
, 5B...Paper feed tractor, I...Paper feed motor, 27...Support frame, 35...
...Long hole, 39...Spring, 41...
·bolt.

Claims (1)

[Scope of utility model registration request] A paper printing device comprising a tractor shaft for pivotally supporting a paper feed tractor, a support frame, and a paper feed motor for position indexing, and in which the drive shaft of the paper feed motor and the tractor shaft are dynamically connected. In the feed mechanism □, the main body of the paper feed motor is configured to be relatively rotatable about the drive shaft with respect to the support frame, and a spring pressure mechanism that relatively presses the three members in a plane perpendicular to the drive shaft. 1. A paper feeding mechanism for a printing device, characterized in that the paper feeding mechanism has a glue for moving the main body in a rotational direction.