JPH04163172A - Cutter - Google Patents

Abstract

PURPOSE:To prevent the free end of a sheet of paper from falling down in the opposite direction to a stationary blade and the paper from being pushing in between guide plates when the paper is pushed by a moving blade, by providing a paper retaining part which is located on the paper traveling path downstream a paper passing slot, and restrains the movement of the free end of the paper in the opposite direction to the stationary blade. CONSTITUTION:A paper retaining plate 16 as a paper retaining member is attached on one of guide plates 3 along an outlets 5b of a paper passing slot 5. That is, the paper retaining plate 16 is a plate-like member and consists of a base plate 17 attached on the guide plate 3 and a retaining part 18 which is bent upward from the base plate 17 at an obtuse angle so as to cover the paper passing slot 5, and the end of the retaining part 18 is positioned along a line perpendicularly intersecting with the guide plates 3 including a stationary blade 6. Therefore, the movement of free end of paper 4 in the direction B is restrained by the retaining part 18 of the paper retaining plate 16. And, the fictional resistance between the paper 4 and the retaining part 18 is increased when the paper 4 is pushed in the direction A as the contact area between the paper 4 and the retaining part 18 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutter device used in a printer or the like to cut paper.

2. Description of the Related Art Conventionally, printers that print on long sheets of paper often use a cutter device that cuts the paper before or after printing. An example of this type of device is shown in FIGS. 3 and 4.

First, a movable blade 2 having a blade portion 1 at its tip is provided, and this movable blade 2 is held in a sandwich-like manner so as to be slidable in a gap between a pair of guide plates 3. These guide plates 3 are formed with slit-shaped paper insertion holes 5 positioned within the movement range of the blade portion 1 of the movable blade 2 and through which the paper 4 is pushed. Also, this paper insertion hole 5
A fixed blade 6 that engages with the blade portion 1 of the movable blade 2 is formed at the edge portion. Furthermore, a paper guide 7 is attached to one of the guide plates 3, located on the entrance 5a side of the paper insertion hole 5.

On the other hand, a pair of paper feed rollers 8 for conveying the paper 4 are arranged on the entrance 5a side of the paper insertion hole 5, and a platen 9 is disposed between these paper feed rollers 8 and the entrance of the paper insertion hole 5. A printing section 11 consisting of a print head 10 and a print head 10 is provided. Accordingly, the paper feed roller 8 is configured such that the driven gear 12 fixed to one of the rotating shafts is connected to the driving gear 14 fixed to the rotating shaft of the motor 13 via the intermediate gear 15. It is a structure driven by 13.

In this structure, the paper feed roller 6 is connected to the motor 13.
When the paper 4 is driven, the paper 4 held between the paper feed rollers 6 is conveyed, and the printing section 11 performs predetermined printing. Then, when the paper 4 is further conveyed, the paper 4 is guided by the paper guide 7 and inserted into the paper insertion hole 5. At this time, the movable blade 2 is driven by a drive section (not shown) in synchronization with the conveyance of the paper 4. Then, the blade portion of the movable blade 2 crosses the paper insertion hole 5 and engages with the fixed blade 6 through the paper 4, so that the paper 4 is cut at a predetermined cutting position.

Problems to be Solved by the Invention When the movable blade 2 engages with the fixed blade 6, the paper 4 is pushed by the blade portion 1 of the movable blade 2 and drawn into the gap between the two guide plates 3. This state is shown in FIG. For this reason, cut paper 4 k)
Inconveniences arise in that the edges may not be clean, the paper 4 may be cut improperly, and furthermore, it may cause a jam.

Means for Solving the Problems The invention as set forth in claim 1 provides a movable blade having a blade portion at the tip and a pair of guide plates sandwiching the movable blade in a slidable manner. A cutter in which slit-shaped paper insertion holes are formed within the movement range of the blade portion of the movable blade and through which the paper is inserted, and fixed blades are formed at the edges of these paper insertion holes to engage with the blade portion of the movable blade. In the apparatus, a paper regulating section is provided, which is located downstream of the paper transport path from the paper insertion hole, and pinches the paper to restrict movement of the free end of the paper in the direction facing the fixed blade.

According to a second aspect of the invention, the paper regulating section according to the first aspect is formed of a plate-like member having one end fixed to a guide plate.

In the invention described in claim 1, when the driven movable blade slides and engages with the fixed blade, the paper in the paper insertion hole is cut at this engaged portion. At this time, the paper is pushed by the movable blade, and its free end pinches the paper and tries to fall in the direction facing the fixed blade. However, since the movement of the free end of the paper in the direction facing the fixed blade is regulated by the paper regulating section, the paper is prevented from falling. Moreover, frictional resistance occurs between the paper and the paper regulating section. Therefore, the paper pushed by the movable blade is prevented from being drawn into the gap between the guide plates, and the paper is always cut well.

According to the second aspect of the invention, when the free end of the paper is about to fall in the direction facing the fixed blade, the frictional resistance between the paper and the paper regulating portion increases. Therefore, drawing of the paper into the guide plate is more reliably prevented, and the state of cutting the paper becomes even better. Moreover, the plate-like shape of the paper regulating section makes it difficult for foreign matter to enter the paper insertion hole, thereby preventing cutting defects.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2. Components that are the same as those shown in FIGS. 3 and 4 are designated by the same reference numerals and explanations will be omitted. In this embodiment, the paper insertion hole 5
A paper regulating plate 16 as a paper regulating section is attached to the guide plate 3 along the exit 5b. That is, the paper regulating plate 16 is a plate-shaped member, and includes a base 17 attached to the guide plate 3 and a regulating part 18 bent at an obtuse angle from the base 17 to cover the paper insertion hole 5. It is formed. Here, the tip of the regulating portion 18 is positioned on a line perpendicular to the guide plate 3 including the fixed blade 6.

In such a configuration, when the paper 4 passes through the paper insertion path 5, the movable blade 2 driven by a drive unit (not shown) slides in the direction of the fixed blade 6, and the paper 4 is cut. At this time, since the paper 4 is pushed by the blade portion 1 of the movable blade 2, a force is applied to the paper 4 to draw it into the gap between the two guide plates 3 in six directions in FIG. Therefore, a force is applied to the free end 4a of the paper 4 to cause it to fall in the direction B in FIG. 2, which is the opposite direction to the direction in which the movable blade 2 moves. However, since the movement of the free end 4a of the paper 4 in the B direction is regulated by the regulation portion 18 of the paper regulation plate I6, the paper 4 is prevented from falling in the B direction. Therefore, the force applied to the paper 4 in the direction A is always applied only from the direction approximately perpendicular to the paper 4, and the paper 4 is applied to the gap between the guide plates 3.
becomes difficult to be drawn into. In addition, the paper 4 and the regulating section 1
8, and this frictional resistance increases as the paper 4 is pushed in the direction A, as the contact area between the paper 4 and the regulating portion 18 becomes larger. Therefore, in terms of frictional resistance between the paper 4 and the regulating portion 18, the paper 4 is kept in a state where it is difficult to be drawn into the gap between the guide plates 3. Therefore, the paper 4 is reliably cut by the engagement between the movable blade 2 and the fixed blade 6, and the cut end is also clean.

On the other hand, since the paper regulating plate 16 is plate-shaped and has a shape that covers the paper insertion hole 5, it serves to prevent foreign matter from entering the paper insertion hole 5. Therefore, inconveniences such as poor cutting of the paper 4 caused by foreign matter entering the paper insertion hole 5 are prevented, and a good cutting state of the paper 4 is maintained.

Effects of the Invention The invention as claimed in claim 1 provides a paper regulating device which is located downstream of the paper conveyance path from the paper insertion hole and which clamps the paper and restricts the movement of the free end of the paper in the direction facing the fixed blade. This prevents the free end of the paper from pinching the paper and falling in the direction facing the fixed blade during cutting, and also creates frictional resistance between the paper and the paper regulating part, which causes the movable blade to It is possible to prevent the paper pushed by the guide plate from being drawn into the guide plate, and therefore the paper can be cut reliably and neatly.

In the invention according to claim 2, since the paper regulating section according to claim 1 is formed of a plate-shaped member having one end fixed to the guide plate, it is possible to increase the frictional resistance between the paper and the paper regulating section. Therefore, it is possible to more reliably prevent the paper from being drawn into the guide plate, and the plate-like shape of the paper regulating portion can prevent foreign matter from entering the paper insertion hole. This has the effect of eliminating cutting defects and maintaining a good cutting condition of the paper.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an embodiment of the present invention, Fig. 2 is a longitudinal side view showing how the paper is cut, Fig. 3 is a longitudinal side view showing an example of the conventional method, and Fig. 4 is the cutting of the paper. It is a longitudinal side view showing a state. l...blade part, 2...movable blade, 3...guide plate, 5...
...Paper insertion hole, 6...Fixed blade, 18...Paper Regulation Department Applicant: Tokyo Electric Co., Ltd.

Claims (1)

[Scope of Claims] 1. A movable blade having a blade portion at the tip thereof, and a pair of guide plates sandwiching this movable blade in a slidable manner, the blade portion of the movable blade being provided on these guide plates. A cutter device comprising slit-shaped paper insertion holes positioned within a movement range of the paper through which the paper is inserted, and a fixed blade formed at the edge portion of these paper insertion holes to engage with the blade portion of the movable blade,
A paper regulating section is provided, which is located downstream of the paper transport path from the paper insertion hole, and pinches the paper to restrict movement of the free end of the paper in the direction facing the fixed blade. cutter device. 2. The cutter device according to claim 1, wherein the paper regulating portion is formed of a plate-shaped member having one end fixed to the guide plate.