JPS6225360Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a paper cutting device.
The present invention relates to a paper cutting device that cuts paper used in computer printers and the like using horizontal cutting perforations provided in advance at regular intervals.

Conventionally, this type of paper cutting device has a pair of paper feed rollers 1, 1 and paper ejection rollers 2, 2 arranged parallel to each other, which press against each other from above and below, as shown in FIG. A sheet of paper having horizontal perforations for cutting (hereinafter referred to as cutting perforations) provided in advance at regular intervals by making the rotation speed of paper rollers 2, 2 higher than the rotation speed of paper feed rollers 1, 1. When the paper 3 is bitten by the paper ejection rollers 2, 2 of 3, tension is applied to the paper 3, and the blade edge is positioned below the surface including the pressure contact surfaces of the paper feed rollers 1, 1 and the paper ejection rollers 2, 2. The cutter 4 provided as shown in FIG. A rotary cutter 5 is provided, and the rotary cutter 5 is aligned with the cutting perforation to cut the paper, or as shown in FIGS. 3a and 3b, the cutter 4 or the rotary cutter is 5
Instead, a diameter of 50 mm with tapers 6 and 6 on both ends.
A roller 7 that uses a large roller 7 with a diameter of mmφ and a width of 100 mm is known.

By the way, in the paper cutting device as shown in FIGS. 1, 2, and 3a, the cutter 4 and the rotary cutter 5 are
Since the paper cutting means such as the roller 7 and the like are arranged only in the substantially central part of the paper 3, for example, as shown in FIG. , . . . When cutting the sheet 3 having vertical perforations 3b perpendicular to , .

The present invention has been made to solve the above-mentioned drawbacks, and is designed to drive the paper ejection roller so that the circumferential speed is greater than the paper feed roller, so that when the paper is caught in the paper ejection roller, the paper In a paper cutting device, a plurality of rollers are arranged on both sides of a vertical perforation provided in the paper, and a plurality of rollers are arranged on both sides of the vertical perforation provided in the paper. By providing this, the purpose is to pierce the paper on both sides of the vertical perforation and to prevent the vertical perforation from being cut when cutting the paper having the vertical perforation.

The present invention will be described in detail below with reference to the accompanying drawings.

5 and 6, 11, 11 are a pair of paper feed rollers pressed against each other from above and below;
Reference numerals 12 and 12 denote a pair of paper ejection rollers that are brought into pressure contact with each other from above and below in the same way as these paper feed rollers 11 and 11; 13 a motor that rotationally drives the paper feed rollers 11 and 11 and the paper ejection rollers 12 and 12; 14; are the paper feed rollers 11, 11 and the paper discharge rollers 12, 1.
2 and the electric motor 13.

The paper feed rollers 11, 11 are connected to support shafts 16, 16 by bearings 15, 15 and 15, 15 attached to the side plates 14a and 14b of the exterior case 14, respectively.
and 16, 16 rotatably, while the paper ejection rollers 12, 12 also support the paper feed rollers 11, 11.
Similarly, support shafts 18, 18 are rotatably supported by bearings 17, 17 and 17, 17 attached to the side plates 14a and 14b, respectively.

Among the bearings 15, 15 and 15, 15 of the paper feed rollers 11, 11, the bearings 15, 15 of the upper paper feed roller 11 are attached so as to be movable up and down with respect to the side plates 14a and 14b, and The upper paper feed roller 11 is
The above bearings 15 and 15 are connected to the lower paper feed roller 1.
1, and presses the upper paper feed roller against the lower paper feed roller 11.

The paper ejection rollers 12, 12 are also similar to the paper feed roller 1.
The upper paper ejection roller 12 is brought into pressure contact with the lower paper ejection roller 12 by a mechanism completely similar to 1 and 11.

The paper feed rollers 11, 11 and the paper ejection roller 12,
12 are arranged parallel to each other at a distance greater than the maximum of the distances between the cutting perforations provided in advance on the paper 3 used in computer printers and the like having various distances.

On the other hand, the electric motor 13 is attached to the side plate 14a of the exterior case 14, and has a pulley 22 attached to its output shaft 21 and a support shaft 2 attached to the side plate 14a.
A belt 25 is stretched between the large diameter pulley 24 rotatably supported by the belt 3.

A chain sprocket 26 is coaxially attached to the large diameter pulley 24, and a chain sprocket 27 fixed to the spindle 16 of the lower paper feed roller 11 among the paper feed rollers 11, 11 is connected to the chain sprocket 26. A chain 29 is stretched between the paper discharging rollers 12, 12 and a chain sprocket 28 fixed to the support shaft 18 of the lower paper discharging roller 12.

The chain 29 is always given a substantially constant tension by the idler 31.

That is, the idler 31 is rotatably supported by one end of a lever 33 that is swingably supported by a support fitting 32 on the side plate 14a of the outer case 14, and is connected to the other end of the lever 33 and a pin protruding from the side plate 14a. 34, the other end of the lever 33 is connected to the arrow Ar in FIG.
A moment in the direction indicated by 2 is applied to give the chain 29 a substantially constant tension.

With the mechanism described above, the rotation of the output shaft 21 of the electric motor 13 is controlled by the belt 25, the large diameter pulley 24, and the chain 29.
and is transmitted to the paper feed rollers 11, 11 and the paper discharge rollers 12, 12.
2, the paper 19 rotates in the direction from the paper feed rollers 11, 11 to the paper discharge rollers 12, 12.

By the way, in order to cut the paper 3 at the cutting perforations, it is necessary to make the circumferential speed of the paper ejection rollers 12, 12 larger than the circumferential speed of the paper feed rollers 11, 11, but in this embodiment, , the ratio of the circumferential speeds of the paper discharge rollers 12, 12 and the paper feed rollers 11, 11 is set to 2:1.

Next, a transport plate 36 is provided between the paper feed rollers 11, 11 and the paper discharge rollers 12, 12 to transport the paper 19 sent from the paper feed rollers 11, 11.

The conveying plate 36 has a surface that includes the pressure contact surfaces of the paper feed rollers 11, 11 and the paper discharge rollers 12, 12,
For example, while fixing both sides to the side plates 14a and 14b of the outer case 14 so as to be located 25 mm below, the paper feed roller 11 of the conveying plate 36,
11 and the vicinity of the paper ejection rollers 12, 12, respectively, so that the paper 19 sent from the paper feed rollers 11, 11 is guided by the transport plate 36,
The paper is conveyed to the pressure contact surfaces of the paper discharge rollers 12, 12.

Further, as shown in FIG. 7, the conveying plate 36 is provided with a mechanism for reducing the contact area between the sheet 3 and the conveying plate 36 to improve the slippage of the sheet 3.
Projections 39, 39, . . . are provided at approximately equal intervals in the conveyance direction.

Between the side plates 14a and 14b of the exterior case 14, a beam 41 whose both ends are fixed near the bearings 15, 15 that support the support shafts 16, 16 of the upper paper feed roller 11 is stretched. bearings 17, 17 that support the support shafts 18, 18 of the paper feed roller 12;
Another beam 4 whose both ends are fixed in the vicinity of
2, and between the center of the beam 41 and the center of the beam 42 there is a cross section that supports a burst fin 44 as a perforation cutting fin and disc-shaped rollers 45, 45, which will be described below. A square support beam 46 is installed.

As shown in FIG. 8a, FIG. 8b, and FIG. 8c, the burst fin 44 has oblique side portions S and S.
The fin portions 44a, 44a are composed of a pair of fin portions 44a, 44a having a side plate 48 forming one side of the square-shaped box-shaped support member 47.
It is formed integrally with the support plates 49, 49 so as to protrude in the same direction from one longitudinal side of the band-shaped support plates 49, 49 having a constant width, respectively protruding from both sides of the frame (see Fig. 8c). At the same time, it is bent toward the box-shaped support member 47 at the joint portion with the support plates 49, 49.

The burst fin 44 includes a
Cuts 51 and 51 are provided at the joint portion of a and 44a with an interval of 50 mm to 180 mm, and rollers 45 and 45 are fitted into these cuts 51 and 51, respectively,
The shafts 52, 52 are connected to the fin portions 44a,
44a and its connecting portion.

The rollers 45, 45 have a diameter d0 of 30 mmφ or less, a width w0 of 10 mm or less, and a protruding amount g0 of the support plate 49 from the fin portions 44a, 44a in a direction perpendicular to the longitudinal direction of the support plate 49 of 3 mm or less. It is preferable to do so.

On the other hand, the width w1 of the burst fin 44 is 250
It is preferable that the lengths of the fin portions 44a and 44a are each 125 mm or more.

The above burst fin 44 and roller 45,
45 is the side plate 48 of the box-like support member 47;
A support beam 46 is fitted into rectangular holes 54 and 54 provided in the side plate 48 and the opposing side plate 53, respectively, and the support beam 46 allows the sheet feeding roller to be moved as shown in FIGS. 5 and 6. It is movably supported between 11, 11 and paper ejection rollers 12, 12.

Also, the side plates 48 and 5 of the box-shaped support member 47
Another side plate 55 adjacent to 4 has a nut 56.
(see FIG. 5), screw a position adjustment screw 57 for adjusting the position of the box-shaped support member 47 into the nut 56, and press the tip of the position adjustment screw 57 against the support beam 46. Thus, the box-like support member 47 can be fixed at any position on the support beam 46.

A rectangular window 59 is provided in the lid plate 58 of the box-shaped support member 47, and through the window 59, sheets of paper provided on the upper surface of the support beam 46 at a distance from the paper ejection rollers 12, 12 are inserted. Numbers or scales indicating the intervals between the cutting perforations No. 3 are made to appear.

The box-shaped support member 47 is attached to the support beam 46 so that the burst fin 44 is inclined toward the paper discharge rollers 12, 12 with respect to the direction in which the paper 3 is conveyed.

Further, when the box-shaped support member 47 is attached to the support beam 46 as described above, the rollers 45, 45
The part facing the conveyance plate 36 is the paper feed roller 1.
1, 11 and the paper ejection rollers 12, 12.
While forming the fin portions 44a, 44a,
Rollers 45, 4 are attached to these fin portions 44a, 44a.
5 is installed.

In the embodiments shown in FIGS. 5 and 6, the distance h0 between the conveyance plate 36 and the pressing surfaces of the paper feed rollers 11, 11 and the paper discharge rollers 12, 12 is expressed as h0=
25 mm, and the conveyor plate 36 and roller 45,
45 is set to h1=3 mm.

The paper cutting device has the above configuration, and the paper ejection roller 12 of the burst fin 44 is adjusted using the adjustment screw 57.
12 according to the interval between the cutting perforations of the paper 3 to be cut, and turn on the power switch (not shown) of the electric motor 13 to cut the paper 3.
is fed between the paper feed rollers 11, 11, the sixth
As shown in the figure, the paper 3 is sent out onto the conveyance plate 36 from its leading end, and the protrusion 3 of the conveyance plate 36
9, 39, . . . and a holding member (not shown) of a constant width attached to a part of the exterior case 14 and provided so as to overlap the protrusions 39, 39, .

When the leading edge of the paper 3 is caught by the paper ejection rollers 12, 12, the paper 3 is under tension because the paper ejection rollers 12, 12 are rotating faster than the paper feed rollers 11, 11. Once lifted from the transport plate 36.

At this time, when the paper 3 has a vertical perforation 3b in the center as shown in FIG. 4, the rollers 45, 45 attached to the burst fin 44 are arranged on both sides of the vertical perforation 3b. At the same time, the distance from the paper ejection rollers 12, 12 matches the interval between the horizontal perforations 3a. Therefore, the rollers 45, 45 are positioned above the horizontal perforation 3a to be cut across the vertical perforation 3b, and the horizontal perforation 3a to be cut is at the intersection with the vertical perforation 3b. is cut off on both sides, and the vertical perforations 3b are not cut off at the same time.

Thereafter, the remaining portion of the horizontal perforation cut through the rollers 45, 45 is filled with the burst fin 44.
The paper 3 is cut by contacting oblique side portions S, S of the fin portions 44a, 44a, and the cut paper 3 is ejected from the paper ejection rollers 12, 12.

Thereafter, each time the paper discharge rollers 12, 12 catch the paper 3, the rollers 45, 45 and the burst fin 44
The paper 3 is cut at the cutting perforations, and the cut papers are sequentially discharged from the paper discharge rollers 12, 12.

In the above embodiment, since the roller 45 has a small shape with a diameter d0 of φ30 mm or less and a width w0 of 15 mm or less, the contact area between the rollers 45, 45 and the paper 3 is small, and the contact area of the rollers 45, 45 is small. Force will be concentrated in one area. Therefore, even if the paper 3 is thick or the rollers 45, 45 are misaligned from the cutting perforation, it is possible to reliably cut through the cutting perforation.
Burst fin 44 with width w1 of 250mm or more
Therefore, the remaining portions of the cutting perforations can be cut without tearing at both ends, even when the paper 3 has a so-called shallow depth, in which the intervals between the cutting perforations are small. Can be cut reliably. Note that the rollers 45, 45 may have their outer peripheral surfaces rounded so that the area of contact with the paper 3 is made smaller.

In the above explanation, basic embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and various configurations can be made within the scope of the gist of the present invention.

For example, in the embodiments of FIGS. 5 and 6, the positions of the paper feed rollers 11 and 11 and the paper ejection roller 1 are
2 and 12, and replace the paper feed rollers 11 and 12.
The direction of rotation of the electric motor 13 is determined so that the paper is sent out from the 11 side to the paper ejection rollers 12, 12 side, and the burst fin 44 is mounted on a support beam so that its fin portions 44a, 44a are inclined toward the paper ejection rollers. It may also be attached to.

Further, the number of rollers 45 can also be set to three or more, corresponding to the vertical perforations of the paper to be cut.

As is clear from the detailed description above, the present invention utilizes the difference in rotational speed between the two sets of front and rear paper feed rollers and paper ejection rollers to create a part of the cutting perforation that runs in the width direction of the paper. In a paper cutting device that uses a small roller to cut through the paper and then cuts the remaining cutting perforation using a wide burst fin, the paper is cut off on both sides of the vertical perforation using multiple rollers. Therefore, even when cutting paper having vertical perforations, it is possible to prevent the vertical perforations from being cut.

[Brief explanation of drawings]

1, 2 and 3a are explanatory diagrams of conventional paper cutting devices, FIG. 3b is an explanatory diagram of rollers used in the paper cutting device of FIG. 3a, and FIG. 4 is a vertical FIG. 5 is a plan view showing the structure of an embodiment of the paper cutting device according to the present invention; FIG. 6 is a sectional view taken along the line - - of FIG. 5; FIG. 7 is a conveyance plate. , FIG. 8a, FIG. 8b, and FIG. 8c are a rear view, a plan view, and a side view, respectively, for explaining the structure of the burst fin and the small roller portion. 11... Paper feed roller, 12... Paper ejection roller, 1
3... Electric motor, 36... Conveyance plate, 44... Burst fin (44a... Fin portion), 45... Roller, 46... Support beam.

Claims (1)

[Scope of utility model registration request] A driving means drives a paper feed roller and a paper ejection roller provided at the front and back in the running direction of paper having vertical perforations used in computer printers, etc., so that the circumferential speed of the paper ejection roller is greater than the circumferential speed of the paper feed roller. When the paper is caught in the paper ejection roller, tension is applied to the paper, and the paper is lifted from the transport plate that transports the paper between the paper feed roller and the paper ejection roller, and the paper is moved. In a paper cutting device that cuts horizontal perforations for cutting provided perpendicularly to the running direction of the paper at regular intervals to a roller provided in the middle of the paper, the vertical perforations are placed on both sides of the vertical perforation. The rollers are arranged at approximately equal distances from each other, and the position from the paper ejection roller is adjustable so as to approximately match the horizontal perforation of the paper, and is positioned below the level of the lifted paper. It includes a plurality of disc-shaped rollers and a perforation cutting fin consisting of a pair of fin parts having hypotenuse parts projected on both sides of these rollers, and the roller cuts through the horizontal perforation, and the fin part A paper cutting device characterized in that the paper cutting device is adapted to cut the paper by bringing the vicinity of both sides of the horizontal perforation cut into the oblique side of the paper into contact with each other.