JPH089443B2 - Tractor device for continuous paper guide - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous paper guide tractor device, and more particularly to a continuous paper guide tractor device for smoothly guiding the running of a paper by a pin belt.

[0002]

2. Description of the Related Art Conventionally, in a continuous paper guide tractor device, a spring pin is provided at the center of rotation of the tractor cover, and the tractor cover is closed by a coil spring in order to guide the paper while pressing the traveling paper. , Jitsukaihei 1-76248).

[0003]

In the above-mentioned conventional example, there is an inconvenience that the door is not sufficiently pressed against the vibration and the local variation of the sheet thickness, which causes the sheet to come off the tractor. . For this reason, in recent years, in order to stabilize the running of the paper, a method is adopted in which the tractor cover, which is a component of the tractor assembly, is closed by pulling it with a spring. It was preventing it from coming off.

However, in such a method, the number of constituent parts of the tractor assembly is increased, and accordingly, the number of assembling steps is increased, which causes an inconvenience of high cost.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tractor device for a continuous paper guide, which is capable of improving the disadvantages of the conventional example, particularly reducing the number of parts and stabilizing the paper running. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a tractor frame, a pin belt wound around the tractor frame for traveling, a tractor frame equipped with the pin belt, and the pin belt is closed to hold the paper from the outside. The tractor cover is provided with a tractor cover for guiding traveling, and an opening / closing center pin that is mounted on the tractor frame and rotatably supports the tractor cover. Further, a locking projection is provided in the vicinity of the opening / closing center pin of the tractor cover, and a plate spring is provided which is always in contact with the locking projection. The structure is such that a stopper that maintains the closed state of the tractor cover is provided at the portion that comes into contact with the portion. This aims to achieve the above-mentioned object.

[0007]

[Operation] The tractor cover 3 prevents the floating of the paper and guides the travel of the paper.
Is opened and closed. On the other hand, when the tractor cover is opened, the opening / closing surface cam 5 integrally formed on the tractor cover bends the spring integrally formed on the tractor frame as described above to ride on the stopper portion to open and close the tractor cover. Ride up the stopper and close it. Therefore, when the paper is guided, even if the paper has a partial thickness variation such as wrinkles, the tractor cover does not open unless the spring integrally formed with the tractor frame bends by a predetermined amount or more. This prevents the paper from coming off.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, the tractor frame 1, a pin belt 2 wound around the tractor frame 1 to run, and a closed state in which the tractor frame 1 is equipped with a sheet from the outside of the pin belt 2. The tractor cover 3 guides the traveling of the sheet, and the open / close center pin 4 mounted on the tractor frame 1 and rotatably supporting the tractor cover 3.
The tractor frame 1 is formed by molding.

Further, an opening / closing surface cam 5 as a locking projection is provided in the vicinity of the opening / closing center pin 4 of the tractor cover 3, and the leaf spring portion 6 which is always in contact with the opening / closing surface cam 5 is the tractor described above. Equipped on frame 1. A stopper 7 that maintains the closed state of the tractor cover 3 is provided at a portion of the leaf spring portion 6 that comes into contact with the above-described opening / closing surface cam 5.
Is equipped.

A concave groove 7A that engages with the stopper 7 when the tractor cover 3 is open is provided in the open / close surface cam 5.

Further, although the leaf spring portion 6 and the stopper 7 may be made of different materials, they are integrally molded with the tractor frame 1 by the same material as the tractor frame 1 in this embodiment.

More specifically, FIG. 1 shows a state diagram in which the tractor cover 3 is closed in the tractor assembly. In addition, the pin belt 2 functions to insert a protrusion into a guide hole provided in the paper to run the continuous paper. The tractor cover 3 prevents the sheet from floating and guides the traveling of the sheet, and is opened and closed around the opening / closing center pin 4. The open / close center pin 4 is formed integrally with the tractor frame 1.

Further, the stopper 7 is provided on the plate spring portion 6 as described above, and effectively prevents the tractor cover 3 from opening due to vibration or partial thickness variation of the paper. When the tractor cover 3 is opened / closed, the tractor cover 3 is opened / closed by an external force. in this case,
The open / close surface cam 5 pushes the stopper 7 against the pressing force of the leaf spring portion 6. As a result, the open / close surface cam 5 easily gets over the stopper 7 by the lever action of the tractor cover 3. FIG. 2 shows a state diagram when the tractor cover is opened.

The opening / closing force of the tractor cover 3 depends on the leaf spring portion 6.
It is set in advance in consideration of the plate thickness and the length of the arm that is the inflection point. The opening / closing cam 5 restricts the tractor cover 3 from opening the tractor cover when the paper is running.

When the tractor cover 3 is opened, the open / close surface cam 5 integrally formed on the tractor cover 3 bends the plate spring portion 6 integrally formed on the tractor frame 1 as described above, and the stopper 7 rides on and opens. Similarly, at the same time, the leaf spring portion 6 is bent and the stopper 7 is mounted and closed.
Therefore, when the sheet is guided, even if the sheet has a partial thickness variation such as a wrinkle, if the leaf spring portion 6 integrally formed with the tractor frame 1 does not bend more than necessary, the tractor cover 3
Is designed not to be opened, which effectively prevents the sheet from coming off.

[0016]

Since the present invention is constructed and functions as described above, according to this, the tractor frame is provided with the leaf spring portion and the leaf spring portion is provided with the stopper, and at the same time, the opening / closing surface which engages with the stopper. Since the cam is provided on the tractor cover as described above, it is possible to reduce the number of parts and simplify the assembly process, and therefore, it is possible to reduce the cost and stabilize the paper running by the action of the stopper. (EN) Provided is an unprecedented excellent continuous paper guide tractor device which can further simplify the assembly process by molding the leaf spring portion and the stopper integrally with the tractor frame. You can

[Brief description of drawings]

FIG. 1 is an overall view showing a closed state of a tractor cover according to an embodiment of the present invention.

2 is an explanatory view showing a state in which a tractor cover is opened in the embodiment of FIG. 1. FIG.

[Explanation of symbols]

 1 tractor frame 2 pin belt 3 tractor cover 4 opening / closing center pin 5 opening / closing surface cam as a locking projection 5A recessed groove 6 leaf spring 7 stopper

Claims (3)

[Claims] 1. A tractor frame, a pin belt wound around the tractor frame to travel, and a tractor cover mounted on the tractor frame for guiding the travel of the paper in a closed state in which the paper is pressed from the outside of the pin belt. A tractor device for a continuous paper guide, comprising: an opening / closing center pin that is mounted on the tractor frame and rotatably supports the tractor cover, wherein a locking projection is provided near the opening / closing center pin of the tractor cover, and The tractor frame is provided with a leaf spring portion that is always in contact with the locking projection portion, and a stopper that maintains the closed state of the tractor cover is provided in a portion of the leaf spring portion that is in contact with the locking projection portion. Characteristic continuous paper guide tractor device. 2. A tractor frame, a pin belt wound around the tractor frame for traveling, and a tractor cover provided on the tractor frame for guiding the traveling of the sheet in a closed state in which the sheet is pressed from the outside of the pin belt. A tractor device for a continuous paper guide, comprising: an opening / closing center pin that is mounted on the tractor frame and rotatably supports the tractor cover, wherein a locking protrusion is provided near the opening / closing center pin of the tractor cover, and The tractor frame is provided with a leaf spring portion that is always in contact with the locking projection portion, and a stopper that maintains the closed state of the tractor cover is provided at a portion of the leaf spring portion that is in contact with the locking projection portion. A recessed groove that engages with the stopper when the cover is open is provided in the locking projection. A continuous paper guide tractor device characterized by. 3. The continuous paper guide tractor device according to claim 1, wherein the leaf spring portion and the stopper are integrally molded with the tractor frame by using the same material as the tractor frame. .