JPS6322959B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutter that is used in a copying machine or the like that uses roll paper and cuts a sheet-shaped object such as paper into a predetermined length.

(Prior art) Generally, when cutting paper as a sheet-like object, a pair of blades consisting of an upper blade and a lower blade having a blade width greater than the width of the paper is provided, and one of the blades is The following device is used with a fixed That is, as shown in FIG. 1, one blade 1 as a fixed blade and the other blade 2 are
As shown in FIG. 2, one blade 4 is provided as a fixed blade, and the other blade is a rotary blade 6 rotatably supported on a shaft 5. There is a rotary system in which a bearing 7 and a clutch 8 are attached to the shaft 5, and a rotary blade 6 is rotated in the direction of arrow b by a motor 10 via a belt 9 to cut the paper 3. Further, as shown in FIG. 3, one of the fixed blades 1 has a blade width that is greater than the width of the paper 3;
As the other blade, a disc-shaped blade 11 is used, and as shown in FIG. There is also a slitter method in which both of the blades are disk-shaped blades 12 and 13, respectively, and the paper 3 is conveyed between them while rotating the blades 12 and 13 as shown by arrows d and e to cut the sheet.

All of these four methods basically combine blades made of two rigid bodies, and their cutting speed and cutting amount (the blade is
Which method is to be adopted will be determined depending on the intended use of the paper 3, taking into account the amount of processing per operation), sagging, burrs, etc. of the cut paper 3 after cutting. For example, if you want to cut a large amount, use the above method, and if the throughput is small but a compact mechanism is required, use the slide method or slitter method, which is an intermediate method. It is relatively compact and requires medium-sized processing.
Moreover, the above-mentioned rotary system is used when low driving energy is required.

(Problems to be Solved by the Invention) However, the blades used in each of these methods, whether fixed blades or movable blades, are very expensive, and as mentioned above, they are made of rigid bodies, such as metal pieces. If foreign matter gets into the blade, the cutting edge is likely to be damaged. Furthermore, if the cutting edge is damaged, it will be necessary to replace the cutting tool, but in this case, as for the relative position of the cutting edge, if the gap between the cutting tools becomes large, it will result in a tear cut, and the broken surface of the paper 3 will become a cut. On the other hand, if the gap becomes smaller, so-called galling will occur due to contact between the blades, which can damage the blades.The adjustment is extremely delicate and not easy. Therefore, the replacement work at the site of use is troublesome and cannot be easily performed, and the replacement work is also lacking in speed. Furthermore, when the humidity is high, the moisture content of paper increases, or in the case of chemically treated special paper, the moisture content increases, resulting in a disadvantage that the sharpness deteriorates and the life of the blade is shortened due to abrasion of the cutting edge.

(Means for Solving the Problems) The present invention has been made in view of the above problems, and aims to reduce the cost and size of the device, and simplify the replacement and adjustment of the cutting member. To provide a cutter that can maintain good cutting performance for sheet-shaped objects to be cut without being affected by moisture content, and that can improve the durability of the device against heat and fatigue. be.

That is, the present invention comprises: one blade as a fixed blade made of a rigid body; a wire which is arranged to face the blade in order to perform cutting; and which is swingably supported with one end as a locking fulcrum; A drive means in which the swinging free end side of the wire is driven forward and backward, and the wire is placed relaxed in a non-cutting position and placed under tension in a cutting position; and energization for slightly heating the wire during cutting operation. It is equipped with means.

In such a technical means, the driving means may be capable of linear reciprocating motion or may be capable of rotational reciprocating motion. Also, regarding the above-mentioned energizing means, the amount of current is set according to the material of the wire, etc., to the extent that it dries the cut portion of the sheet-like cut object, so that burn marks etc. do not occur in the cut portion of the sheet-like cut object. It is necessary to do so.

(Function) According to the above-mentioned technical means, the wire cuts the sheet-shaped object with sufficient cutting stress while being pressed into parts of the wire sequentially from the locking fulcrum side, and at the same time, the wire cuts the sheet-shaped object with sufficient cutting stress. The cut portion of the sheet-shaped material to be cut is dried by applying current and heating appropriately.

Further, the wire temporarily changes from a tensioned state to a relaxed state during a non-cutting operation.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIGS. 5 and 6 show the configuration when one embodiment of the present invention is applied to cutting roll paper, and the configuration of the wire side that becomes the other blade.

In FIG. 5, 14 is a roll of rolled paper, 15 is a guide roll, 16 is a feed roll, 17 is a pinch roll, and the paper 18 from the roll 14 is guided by the feed roll 16 by the guide roll 15. It is inserted between the feed roll 16 and the pinch roll 17, and is held between the feed roll 16 and the pinch roll 17. 19 is a cutter base made of an electrically insulating material such as Bakelite; 20 is a rigid fixed blade (lower blade in the illustrated example) as one blade fixed to the cutter base 19; is provided with a drive means for the wire 26, which will be described later, and this drive means includes the cutter base 19.
Brackets 22, 22 are fixed to one end side by screws 21, 21, and a shaft 24 of a motor 23 is rotatably attached to these brackets 22, 22, and a cam 25 is further fixed to the shaft 24. . Part 2 of this cam 25
5a is made of a heat-resistant material such as ferrite, and the cutter receiving portion 19a at the other end of the cutter base 19 is similarly made of a heat-resistant material such as ferrite. And this cam 25
A wire 2 serving as the other blade is connected between a portion 25a of the cutter base 19 and the cutter receiving portion 19a of the cutter base 19.
6 is attached, and each cord 28 from the AC power source 27 is connected so that AC is applied to the wire 26.
That is, the wire 26 is made of, for example, a piano wire or a tungsten wire, and as shown in FIG. 6, end terminals 29 and 30 are fixed to each end by caulking. 31 is fixed to the cutter receiving portion 19a of the cutter base 19 via a screw 32, and the end terminal 29 and the terminal 31 of the other cord 28 are similarly fixed to a portion 25a of the cam 25 by the screw 32. The paper 18 described above is inserted between the fixed blade 20 and the wire 26.

Next, the operation of the above configuration will be explained.

Assume that the paper 18 is now held between the feed roll 16 and the pinch roll 17 and is ready to be fed out. In this state, when the feed roll 16 is rotated by an external control signal and its drive mechanism, the paper 18 is pulled out from the roll 14 and fed, and after a certain amount of paper has been fed, the feed roll 16 is stopped, and then the paper 18 is cut. That is, the wire 26 is energized by the AC power source 27 to generate heat, and the motor 23
When the wire 26 is rotated by an external control signal, the cam 25 rotates and the wire 26 which generates heat can be lowered while being tensed and pressed against the paper 18. At this time, since the wire 26 is locally pressed against the paper 18 in order from the locking fulcrum side, a large cutting stress acting on the paper 18 can be ensured without increasing the driving force of the drive means so much. Therefore, the sharpness of the paper 18 can be improved accordingly. Furthermore, since the cut portion of the paper 18 can be instantly dehydrated by the heat of the wire 26, the water content of the paper 18 is rapidly reduced and the paper 18 becomes dry, reducing the cutting load on the paper 18. be able to. For this reason, paper with a high moisture content or wet paper is very difficult to cut, but as mentioned above, since it is cut after reducing the moisture content, it is less affected by humidity, and the moisture content is inherently high. Even special paper can be easily cut. On the other hand, since the degree of energization to the wire 26 is sufficient to dry the cut portion of the paper 18, the area around the cut portion of the paper 18 will not be scorched by heat. After cutting is completed in this manner, the motor 23 is driven in reverse to return the wire 26 to its original state as shown in FIG. 5, ready for the next cutting.

Also, if the wire 26 breaks, the screw 3 on the cutter base 19 and cam 25
2 and attach a new wire 26 configured as shown in Fig. 6, the cost can be significantly reduced compared to the conventional method, and it can also be easily replaced at the site of use. be able to.

(Effects of the Invention) As explained above, according to the cutter according to the present invention, the wire serving as the cutting blade is locally pressed against the sheet-shaped object from the locking fulcrum side in order, thereby applying cutting stress. In addition, a small amount of heat generated from the wire evaporates the moisture in the sheet-shaped object and makes the cutting area of the sheet-like object dry with a small cutting load. In addition to improving the sharpness of the wire, since the degree of electricity applied to the wire does not reach the level of burning out the sheet-shaped object to be cut, it is possible to suppress thermal deterioration of the wire as much as possible and improve durability. There is no possibility that the sheet-like cut object will have any defects due to browning or heating, and the commercial value of the sheet-like cut object can be maintained at a good value.

In addition, according to this invention, since the wire is placed in a relaxed position when being cut, the degree of fatigue of the wire can be suppressed compared to a type in which the wire is placed under tension at all times, and the decrease in durability due to fatigue can be effectively reduced. It can be prevented.

Further, according to the present invention, an inexpensive wire is used as one of the blades, the driving force for the wire can be reduced, and the driving means for the wire can be simplified. Since there is no need to use other parts, it is possible to make the device less expensive and more compact, and it is also possible to reduce cost losses in the event of wire breakage, and wire replacement and adjustment can be done simply and easily. Therefore, the wire replacement and adjustment work can be easily and quickly performed at the site of use.

[Brief explanation of the drawing]

Figures 1 to 4 all show a conventional paper cutting method, Figure 5 is a perspective view of an embodiment of the present invention, and Figure 6 shows the configuration of the wire side as the other blade. This is an enlarged view. Explanation of symbols, 20...Fixed blade, 23...Motor, 26...Wire, 27...AC power supply.

Claims (1)

[Claims] 1. One blade as a fixed blade made of a rigid body, a wire arranged to face each other to perform cutting between this blade and swingably supported with one end as a locking fulcrum; The swinging free end side of the wire is driven forward and backward to set the wire to the non-cutting position, and the wire is placed in a relaxed position in the non-cutting position and the wire is placed under tension in the cutting position. A cutter equipped with an energizing means for slightly energizing and heating.