JPH0749192B2 - Paper cutting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting device for cutting a paper in a plotter, a copying machine or the like using roll paper, and more particularly to a paper cutting using a fixed lower blade and an upper blade which moves along the fixed lower blade. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, as a paper cutting device, a rotary cutter using a fixed blade and a rotary blade each having a blade longer than the width of the paper to be cut has been known (for example, Japanese Patent Laid-Open No. 50-114688). reference). However, since this rotary cutter uses a long rotary blade, the weight becomes large, and in particular, when the paper width becomes large, the rigidity necessary for the rotary blade is secured, so that the weight becomes further heavy.

As an alternative to the rotary cutter,
A paper cutting device having a fixed lower blade and an upper blade that moves along the fixed lower blade is known. The paper cutting device of that kind is shown in FIGS.
, A fixed lower blade 1 having a linearly extending blade 1a, and a round blade 2 that is an upper blade that cooperates with the fixed lower blade 1.
A round blade supporting member 3 which supports the round blade 2 so as to be rotatable and to press the side surface of the tip against the blade 1a of the fixed lower blade.
Is arranged parallel to the round blade fixing member 4 and the fixed lower blade 1,
A guide shaft 5 for movably holding the round blade support member 3, a round blade moving means 6 for moving the round blade support member 3 along the guide shaft 5, a lower paper guide 7, an upper paper guide 8 and the like are provided. Then, by driving the round blade moving means 6 with a motor or the like (not shown), the round blade supporting member 3 moves left and right on the guide shaft 5, whereby the round blade 2 is pressed against the fixed lower blade 1. In this state, the paper 9 moved left and right along the fixed lower blade 1 and the paper 9 inserted between the fixed lower blade 1 and the round blade 2 was cut.

[0004]

However, according to such a structure, when cutting a wide paper, the rigidity of the central portion is insufficient, and as shown in FIG. 10, the fixed lower blade 1 and the round blade 2 are pressed against each other. The state is released, the round blade 2 rides on the fixed lower blade 1, and further enters between the fixed lower blade 1 and the lower paper guide 7 or rises up to the lower paper guide 7 (hereinafter referred to as derailment),
There was a problem that the paper could not be cut. Further, when the present cutting device is used in combination with another paper transport unit, the user cannot easily return it, and there is a problem that it is stopped for a long time.

The above-mentioned problems occur for the following reasons. That is, as shown in FIG. 11, by moving the round blade 2 in the direction of arrow A while being pressed against the fixed lower blade 1, the round blade 2
Rotates in the direction of arrow B, and thereby cuts the paper 9, but at this time, a force in the direction of arrow F acts on the round blade 2 due to the cutting reaction force of the paper. This cutting reaction force varies depending on the paper thickness and the material to be cut, and becomes large when the paper thickness is large or when the film is cut. If the paper itself has wrinkles or folds, or if the individual lower blade has burrs or damage, the round blade 2 is in a state of climbing while rotating, and a force in the F direction is generated.

According to this configuration, when a force in the F direction is generated, it is necessary for the guide shaft 5 to support the force. However, in the case of cutting a wide paper, the guide shaft 5 itself becomes long and the center thereof is increased. If the rigidity of the part is insufficient and the force in the F direction cannot be supported,
It derails, causing poor cutting.

The following two points can be considered as a solution. First
In addition, the rigidity of the guide shaft 5 can be increased, but the size of the device is increased. Secondly, as shown in FIG.
It is conceivable to increase the overlap amount d between the fixed lower blade 1 and the round blade 2, but if d is increased, the cutting reaction force also increases, and a roughened state or wavy phenomenon easily occurs on the cutting surface. turn into.

Further, even in the solutions of the above two plans, if a derailment should occur, it cannot be easily recovered.

The present invention has been made in view of the above problems, and does not impair the size of the apparatus and the quality of the cut surface,
Moreover, it is an object of the present invention to provide a paper cutting device that can be continuously used even if a derailment should occur.

[0010]

According to the present invention, in order to solve the above-mentioned problems, along a moving path of an upper blade which moves along the fixed lower blade in a state where a side surface is pressed against the blade of the fixed lower blade, A guide member for restricting the moving position of the upper blade when the upper blade is dislocated from the blade of the fixed lower blade and rides on the fixed lower blade, and further, at both ends of the guide member, the upper blade is provided. The blade is provided with a returning surface for pushing back the blade in the direction of the fixed lower blade.

Further, instead of providing return surfaces at both ends of the guide member, a return inclined at both ends of the fixed lower blade so as to guide the upper blade riding on the fixed lower blade and return to the direction of the blade. You may provide a surface.

It is preferable that the guide member is provided with derailment detecting means for detecting the upper blade that moves while the movement position is regulated by the guide member.

[0013]

Since the present invention has the above-described structure, when the upper blade is released from the pressure contact state with the fixed lower blade during cutting and rides on the upper surface of the fixed lower blade, the upper blade is restricted by the guide member and the state is maintained. To move. Therefore, the upper blade moves to a position that is not so far from the blade of the fixed lower blade. Then, when the upper blade moves to the end of the moving range, it is pushed back in the direction of the blade of the fixed lower blade by the return surface of the guide member or the return surface of the fixed lower blade, and returns to a predetermined position with respect to the fixed lower blade. . Therefore, the next cutting can be performed.

If the guide member is provided with derailment detection means for detecting the upper blade that moves while the movement position is regulated by the guide member, the derailment detection means can detect that the upper blade has derailed. preferable.

[0015]

1 is a schematic perspective view showing the schematic construction of a paper cutting apparatus according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of an end portion of the embodiment, and FIGS. ) And (c) are schematic sectional views or side views for explaining the operation in the embodiment, and the same parts as those in the conventional example are denoted by the same reference numerals. Figure 1
In FIG. 3, 1 is a fixed lower blade having a linearly extending blade 1a, and 2 is an upper blade for moving the fixed lower blade 1 while pressing its side surface against the blade 1a to cut the paper. A round blade supporting member 3 supports a round blade 2 of which is rotatable and a side surface of the tip thereof is pressed against the blade 1a of the fixed lower blade 1, and 4 is a round blade supporting member. For fixing the round blade fixing member 5 to the fixed lower blade 1 in parallel to hold the round blade supporting member 3 movably, 6 moves the round blade supporting member 3 along the guide shaft 5. Round blade moving means to
Reference numeral 7 is a lower paper guide, 8 is an upper paper guide, and 9 is paper. 10
Is a guide disc fixed to the side surface of the round blade 2 so as to rotate integrally with the round blade 2, and is provided so that a guide member described later does not directly contact the round blade 2. Reference numeral 11 is a guide member which is integrally formed with the upper paper guide 8 and is arranged along the movement path of the round blade 2. The guide member 11 is shown in FIG.
As shown in (a), when the round blade 2 moves along the fixed lower blade 1 with the side surface of its tip pressed against the blade 1a of the fixed lower blade 1, it is fixed to the side surface of the upper blade 2. Guide disk 1
Although it is slightly apart from 0, as shown in FIG. 3 (b), when the round blade 2 comes off the blade 1 a of the fixed lower blade 1 and rides on the upper surface of the fixed lower blade 1, the guide disc The circular blade 2 is arranged so as to come into contact with the circular blade 10 and regulate the movement of the circular blade 2 so that the circular blade 2 is not too far from the blade 1a.

The guide member 11 extends to the outside on both sides of the paper cutting area, and both end portions located outside the paper cutting area form a return surface 11a inclined toward the blade 1a of the fixed lower blade 1. Has become. This return surface 11a is shown in FIG.
As shown in, the circular blade 2 is set to return to the right side of the blade 1a of the fixed lower blade 1 via the guide disk 10 that is in contact with the return surface 11a. In addition, this return surface 11a
Is provided outside the paper cutting area, so when the round blade 2 moves to the paper cutting start position, the fixed lower blade 1 of the round blade 2
It does not affect the pressure contact with the blade and therefore does not hinder the cutting. 1 and 2,
Limit switches 13 for detecting the guide disk 10 traveling while contacting the guide member 11 are provided near both ends of the guide member 11. The limit switch 13 constitutes derailment detection means for detecting the upper blade that moves while the movement position is restricted by the guide member.

The operation of the paper cutting device configured as described above will be described below. At the time of normal cutting,
As shown in (a), the round blade 2 travels along the fixed lower blade 1 with its tip side surface pressed against the blade 1a of the fixed lower blade 1 and the side surface under the fixed blade 1, and the paper 9 (see FIG. 1) Disconnect. At this time, the guide disk 10 attached to the round blade 2 is the guide member 11
Is not in contact with.

When derailment occurs during cutting, the round blade 2 rides on the upper surface of the fixed lower blade 1 as shown in FIG. 3 (b), but the guide disk 10 immediately contacts the guide member 11,
The position of the round blade 2 is regulated. For this reason, the round blade 2 does not move further to the left side, and its cutting edge does not fit between the fixed lower blade 2 and the lower paper guide 7 or move to the lower paper guide 7. When the circular blade 2 further moves while the position is regulated by the guide member 11 and approaches the end of the moving range, the guide disk 10 is moved by the return surface 11a at the end of the guide member 11 to the arrow C in FIG. Is pushed back in the direction shown by, and the riding of the round blade 2 on the fixed lower blade 1 is released. Therefore, the next cutting can be performed. Further, when the guide disk 10 moves in contact with the guide member 11 and passes by the limit switch 13, the limit switch 13 can detect it, and the occurrence of derailment of the circular blade and the cutting failure can be detected. If the alarm signal is issued by the detection signal of the limit switch 13, the operator can be notified of the occurrence of derailment and defective cutting. Further, when the re-cutting operation is configured to be performed by the detection signal, the re-cutting can be automatically performed and the cutting failure can be eliminated.

Although the guide member 11 is formed integrally with the upper paper guide 8 in the above embodiment, it goes without saying that the guide member 11 may be provided as a separate component from the upper paper guide 8. Although the guide disc 10 is arranged coaxially with the round blade 2, it does not need to be coaxial so long as the guide member 11 and the round blade 2 do not come into direct contact with each other. Further, in the above embodiment, the round blade 2 is always moved to the position where it is regulated by the guide surfaces 11a at both ends of the guide member 11, but at the time of normal cutting, the round blade 2 is moved to the position of the limit switch 13. Only when the limit switch 13 detects the derailment of the round blade by folding back, the round blade 2 moves to the return surfaces 11a at both ends of the guide member 11,
The derailment may be released.

Next, FIG. 4 shows a second embodiment of the present invention. In this embodiment, as shown in (a), inclined return surfaces are not formed at both ends of the guide member 11, but instead, both ends of the fixed lower blade 1 are shaved and the inclined return surfaces are returned. The surface 1b is formed. The return surface 1b is not limited to the shape shown in (a), but may have the shape shown in (b). In this embodiment, when the derailed round blade 2 comes to the end of its moving range, as shown in FIG. 5, the blade edge is guided back to the return surface 1b and pushed back in the direction indicated by the arrow C, The riding of the round blade 2 on the fixed lower blade 1 is released.

6 and 7 each show a modification of the derailment detecting means used in the above-described embodiment. In FIG. 6, the upper paper guide 8 formed integrally with the guide member 11 is entirely rotatable about the support shaft 14, and when the round blade 2 is not derailed, the position shown in (a) is set. To occupy. Also, the limit switch 13
Is attached at a position slightly away from the tip of the paper guide 8. When the circular blade 2 is derailed and the guide disk 10 fixed to the circular blade 2 is pressed against the guide member 11, the guide member 11 and the upper paper guide 8 are rotated to operate the limit switch 13, Thus, the derailment of the round blade 2 can be detected. In this case, it is not necessary to provide two limit switches 13 at both ends of the guide member 11. FIG. 7 shows a case in which the guide member and the derailment detecting means are used together, and the insulating portion 16 is provided along the moving path of the round blade with the pair of electrodes 17a, 1a.
A guide member 15 sandwiched in 7b is arranged,
The power supply 18 and the ammeter 1 are connected to the pair of electrodes 17a and 17b.
9 is connected. As shown in (a) of FIG. 7, since the guide disk 10 is not in contact with the guide member 15 at the time of normal cutting, the pair of electrodes 17a and 17b does not conduct, but due to the derailment of the round blade, When the guide disk 10 contacts the guide member 15 as shown, the guide member 1
The pair of electrodes 17a and 17b are electrically connected via 5 and the derailment can be detected. Although the present invention has been described above by taking the case where a round blade is used as the upper blade, the upper blade usable in the present invention is not limited to the round blade.

[0022]

As is apparent from the above description, the present invention is provided when the upper blade comes off the blade of the fixed lower blade and rides on the fixed lower blade along the moving path of the upper blade. A guide member for regulating the moving position of the upper blade is provided, and further, at both end portions of the guide member, a return surface for pushing the upper blade in the direction of the blade of the fixed lower blade is provided, or both end portions of the fixed lower blade are provided. In, by providing an inclined return surface to guide the upper blade riding on the fixed lower blade and return to the direction of the blade,
Even if the upper blade derails during cutting, it is regulated by the guide member, does not depart much from the position of the fixed lower blade, and when the upper blade moves to the end of the moving range, The return surface or the return surface of the fixed lower blade pushes it back in the direction of the blade of the fixed lower blade and returns it to a predetermined position with respect to the fixed lower blade, so that one cutting failure occurs, but it is normal from the next cutting. It has the result that a cutting operation is possible.

If the derailment detecting means for detecting the derailment of the upper blade is provided and the recutting is automatically performed when the derailment is detected, the cutting failure of the device can be eliminated. can get.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part schematically showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of an end portion of the embodiment of FIG.

FIG. 3 is a view for explaining the operation in the embodiment of FIG. 1, (a) is a schematic view showing a state where a round blade is moving in the central portion of a fixed lower blade during normal cutting, and (b) is derailed. The schematic cross-sectional view showing a state where the round blade in the state is moving in the central portion of the fixed lower blade, (c) is a schematic view showing the state where the round blade is moving the end portion of the fixed lower blade.

FIG. 4 schematically shows a second embodiment of the present invention, in which (a) is a schematic perspective view of an end portion thereof, and (b) is a schematic diagram showing a modified example of the return surface of the end portion of the fixed lower blade. Figure

FIG. 5 is a schematic view showing a state where the round blade is moving along the end of the fixed lower blade in the embodiment shown in FIG. 4 (a).

FIG. 6 shows a modified example of the derailment detection means used in the above embodiment, in which (a) is a schematic cross section showing a state where the round blade is moving in the central portion of the fixed lower blade during normal cutting (b). Is a schematic cross-sectional view showing a derailed round blade moving in the central portion of the fixed lower blade.

FIG. 7 shows another modified example of the derailment detection means used in the above embodiment, and (a) is a schematic cross-sectional view showing a state where the round blade is moving in the central portion of the fixed lower blade during normal cutting. FIG. 6B is a schematic cross-sectional view showing a state where the derailed round blade is moving in the central portion of the fixed lower blade.

FIG. 8 is a perspective view of a main part schematically showing a conventional paper cutting device.

9A is a schematic side view of the conventional example of FIG. 8, and FIG. 9B is a schematic side view showing an enlarged contact portion of a fixed lower blade and a round blade in the conventional example of FIG.

FIG. 10 is a schematic side view showing a state where the round blade is derailed in the conventional example of FIG.

11 is a schematic front view showing a state in which paper is cut in the conventional example of FIG.

[Explanation of symbols]

 1 Fixed lower blade 1a Blade 1b Return surface 2 Round blade 3 Round blade support member 4 Round blade fixing member 5 Guide shaft 6 Round blade moving means 7 Lower paper guide 8 Upper paper guide 9 Paper 10 Guide disk 11 Guide member 11a Return surface 13 Limit Switch 14 Spindle 15 Guide Member 16 Insulating Part 17a, 17b Electrode

Claims (3)

[Claims] 1. A fixed lower blade fixedly provided at a fixed position and provided with a linearly extending blade, and an upper portion which moves along the fixed lower blade with its side surface pressed against the blade of the fixed lower blade. A blade,
A guide member that is arranged along the moving path of the upper blade and that regulates the moving position of the upper blade when the upper blade comes off the blade of the fixed lower blade and rides on the fixed lower blade. The guide member has a return surface for pushing back the upper blade toward the blade of the fixed lower blade at both ends thereof. 2. An individual lower blade fixedly provided at a fixed position and provided with a linearly extending blade, and an upper blade that moves along the fixed lower blade with its side surface pressed against the blade of the fixed lower blade. A blade,
And a guide member that is arranged along the moving path of the upper blade and that regulates the moving position of the upper blade when the upper blade comes off the blade of the fixed lower blade and rides on the fixed lower blade. The fixed lower blade has, at both ends thereof, a return surface that is inclined so as to guide the upper blade riding on the fixed lower blade and return it to the direction of the blade. 3. The paper cutting apparatus according to claim 1, wherein the guide member is provided with derailment detection means for detecting an upper blade that moves while the movement position is regulated by the guide member.