JP2529804Y2 - Drive mechanism for cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drive mechanism for a cutting device that cuts recording paper with a facsimile machine or the like.

[Conventional technology]

Conventionally, a drive mechanism for this type of cutting device is configured as shown in FIG. This will be described with reference to the same figure. In the figure, reference numeral 1 denotes a worm gear provided rotatably on a fixed shaft 2 and engaged with an output shaft 4 of a drive motor 3 via a worm 5; Worm gear 1
A drive pin provided at an eccentric position of
Is a swing arm having a swing blade 9 connected to the drive pin 6 and corresponding to the fixed blade 8. This swing arm 7 has
An elongated hole 7a through which the drive pin 6 is inserted is provided. Note that reference numerals a and O in the figure indicate a rotation direction of the worm gear 1 and a pivot point of the swing arm 7, respectively.

In the drive mechanism for the cutting device thus configured, when the worm gear 1 rotates in the direction shown by the arrow a by the rotation of the drive motor 3, the swing blade 9 moves as shown in FIGS. The recording paper A is cut by swinging as shown in FIG. In this case, when the worm gear 1 makes one rotation, the state returns to the state shown in FIG.

By the way, in the drive mechanism of this type of cutting device, the recording paper A does not travel smoothly, and a paper jam may occur as shown in FIG. In this case, when the swing blade 9 is operated, the load on the drive motor 3 becomes excessively large, and the recording paper A is caught between the swing blade 9 and the fixed blade 8 to stop as shown in FIG. Therefore, it is necessary to remove the recording paper A by rotating the worm gear 1 in the direction shown by the arrow b in FIG. 9 to swing the swing arm 7 in the direction shown by the arrow c in FIG.

[Problems to be solved by the invention]

However, in a conventional drive mechanism for a cutting device,
Since the worm gear 1 and the worm 5 are always engaged with each other, the worm gear 1 cannot be manually rotated smoothly, which makes it difficult to remove the recording paper A when a paper jam occurs. .

The present invention has been made in view of such circumstances, and a cutting device that can smoothly rotate a worm gear manually and thereby easily remove a recording sheet when a paper jam occurs. And a driving mechanism for the same.

[Means for solving the problem]

The drive mechanism for the cutting device according to the present invention is configured such that a worm gear rotatably provided on a fixed shaft and meshing with an output shaft for a drive motor via a worm by a gear that advances and retreats in the axial direction of the fixed shaft, A stopper for restricting the movement of the worm gear in one direction is provided on the fixed shaft, and a spring for urging the worm gear is provided on the stopper.

[Action]

In the present invention, by moving the worm gear in the axial direction of the fixed shaft against the elasticity of the spring,
The meshing state between the worm gear and the worm can be released.

〔Example〕

Hereinafter, the configuration and the like of the present invention will be described in detail with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing a meshing state of a worm gear and a worm in a drive mechanism for a cutting device according to the present invention.
FIG. 3 is a perspective view showing a state in which the engagement between the worm and the worm is released according to the present invention, and the same members as those shown in FIGS. Omitted. In the figure, reference numeral 11 denotes a worm gear that meshes with the worm 5, and is constituted by a gear that advances and retreats in the axial direction of the fixed shaft 2. 12 is a retaining ring as a stopper.
The worm gear 11 is configured to restrict the movement of the worm gear 11 in one direction. 13 is the retaining ring 12
A compression coil spring that biases the worm gear 11 is provided around the fixed shaft 2.

In the driving mechanism for the cutting device thus configured, the worm gear 11 is urged toward the retaining ring 12 by the repulsive force of the compression coil spring 13 so that the worm gear
11 will mesh with the worm 5.

On the other hand, by moving the worm gear 11 in the axial direction of the fixed shaft 2 against the elastic force of the compression coil spring 13, the meshing state between the worm gear 11 and the worm 5 can be released. In this case, when the worm gear 11 is rotated until the swing blade 9 reaches the position shown in FIG. 3, the recording paper A jammed between the fixed blade 8 and the swing blade 9 can be removed.

[Effect of the invention]

As described above, according to the present invention, the worm gear rotatably provided on the fixed shaft and meshing with the output shaft for the drive motor via the worm is constituted by a gear that moves forward and backward in the axial direction of the fixed shaft. A stopper that regulates the movement of the worm gear in one direction is provided on the fixed shaft, and a spring that biases the worm gear is provided on this stopper.
By moving the worm gear in the axial direction of the fixed shaft against the elasticity of the spring, the meshing state between the worm and the worm gear can be released. Therefore, since the worm gear can be rotated smoothly by hand, the operation of removing the recording paper when a paper jam occurs can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a meshing state between a worm gear and a worm in a drive mechanism for a cutting device according to the present invention, FIG. 2 is a perspective view showing a state in which meshing between the worm gear and the worm according to the present invention is released, FIG. 3 is a front view showing a state in which a paper jam has been cleared, FIG. 4 is a perspective view showing a driving mechanism for a conventional cutting device, and FIGS. 5 to 7 are papers in a driving mechanism for a conventional cutting device. FIGS. 8 and 9 are front views for explaining a cut state, and FIGS. 8 and 9 are front views for explaining a paper jam state. 2 ... fixed shaft, 5 ... worm, 6 ... drive pin, 7 ...
... swing arm, 8 ... fixed blade, 9 ... swing blade, 11 ... worm gear, 12 ... retaining ring, 13 ... compression coil spring.

Claims (1)

(57) [Scope of request for utility model registration] A worm gear rotatably provided on a fixed shaft and meshing with an output shaft for a drive motor via a worm;
A drive mechanism for a cutting device, comprising: a drive pin provided at an eccentric position of the worm gear and extending in an axial direction; and a swing arm having a swing blade corresponding to a fixed blade connected to the drive pin. The worm gear is constituted by a gear that advances and retreats in the axial direction of the fixed shaft, a stopper is provided on the fixed shaft for restricting the movement of the worm gear in one direction, and a spring that biases the worm gear is provided on the stopper. A drive mechanism for a cutting device.