JPH0318158Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutter having a wide and long blade that is mainly used for cutting thin paper, metal foil, etc.

[Conventional technology]

A cutter with a long blade for cutting paper or the like has a shear angle to prevent the cutting force from becoming excessive, and usually cuts sequentially from one end to the other.

As such conventional cutters, Figs. 5 to 7
What is shown in the figure and what is shown in the specification and drawings of Utility Model Application Publication No. 55-11890 are known.

In the one shown in Fig. 5, the cutting edge of the movable blade 2 is arranged so as to be inclined with respect to the cutting edge of the fixed blade 1 to create a shear angle, and the movable blade 2 is moved up and down in parallel to maintain a constant shear angle from one end. It is cut at.

In the one shown in FIG. 6, one end of a movable blade 2 formed in an arc shape is rotatably attached to a fixed blade 1 via a support shaft 3, and the other end of the movable blade 2 is moved up and down for cutting.

The one shown in Fig. 7 (see Japanese Utility Model Publication No. 53-7079) is called a rotary cutter, and the rotary blade 4 is rotated by a drive source such as a motor.
(a movable blade) and a fixed blade 5 which is swingably supported and pressed against the rotary blade 4 by a spring, and the cutting edge 4a of the rotary blade 4 is formed into a tapered shape.
Therefore, as the rotary blade 4 rotates, the pressure contact points of the blade edges of the rotary blade 4 and the fixed blade 5 sequentially move from one end to the other end to cut paper or the like. Jitsukai Showa 55-11890
What is shown in the specification and drawings of the issue is a driven rotating member that is rotatably provided at one end of a driven rotating member that is rotatably provided on a fixed part, and a driving rotating member that is fixed to a drive shaft that is rotated by a drive source. It has a movable blade whose other end is rotatably provided, and by moving the movable blade relative to the fixed blade, paper or the like is sequentially cut from one end to the other.

[Problem that the invention attempts to solve]

The one shown in FIG. 5 requires a parallel movement mechanism and is expensive. In the case shown in FIG. 6, the shear angle and cutting torque vary greatly depending on the cutting position. Further, since the portion near the spindle 3 always engages, only the end remote from the spindle 3 can be used in order for the paper to pass through freely. Furthermore, the stroke of the movable blade 2 is large.
For these reasons, it is rarely used in machinery. The one in Figure 7 has a complicated shape of the rotary blade 4,
becomes very expensive.

As shown in the specification and drawings of Utility Model Application No. 55-11890, one end of the driven rotating member is rotatably provided on the fixed part, and the drive source is used to rotate the driven rotating member. A drive rotating member fixed to a rotating drive shaft has a movable blade whose other end is rotatably provided, and by moving the movable blade with respect to the fixed blade or the backing plate, paper etc. can be sequentially moved from one end to the other end. The problem is solved by disconnecting the problem.

However, in this structure, the length of the driving rotation member and the length of the driven rotation member are the same,
The driving rotary member and the driven rotary member move in exactly the same way, and the movable blade moves in parallel to cut the sheets, so there are the following problems.

At the end of cutting the sheets, all the cutting edges of the movable blades are below the cutting edges of the fixed blades. Therefore, it takes the same amount of time as the time it takes to cut the sheets for all the cutting edges of the movable blade to move away from the fixed blade. That is, sheets cannot be passed through until the movable blade completely returns to its original position.

Further, since the movable blade moves in parallel to cut the sheets, the rotation angle of the movable blade 8 required for cutting is about 70 degrees at most, and a large drive torque (cutting force) is required. Further, the horizontal movement of the movable blade is not uniform but a sine curve, and therefore the torque required for driving the blade fluctuates greatly. Furthermore, it is impossible to cut sheets without stopping because the cut surface is curved.

The purpose of this invention is to provide a cutter that can feed sheets quickly after cutting, uses a small drive torque, can be used to cut sheets without stopping, and can cut cleanly. It is about providing.

[Means for solving the problem] The problem with the above-mentioned conventional technology is that one end of the driven rotating member rotatably provided on the fixed part is rotatably provided, and the drive shaft rotated by the drive source is connected to the driven rotating member. The cutter has a movable blade whose other end is rotatably provided on a fixed drive rotating member, and sequentially cuts paper or the like from one end to the other by moving the movable blade with respect to the fixed blade or a backing plate. This problem is solved by making the length of the driving rotating member shorter than the length of the driven rotating member.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. One end of a driven rotating member 11 is rotatably provided at one end of the fixed plate 10 via a support shaft 12, and one end of a movable blade 13 is provided at the other end of the driven rotating member 11 via a support shaft 14. It is rotatably provided. A support 1 is mounted on the other end of the fixed plate 10.
5 is fixed, and the drive shaft 1 is fixed to this column 15.
6 is rotatably supported. Also, the fixed plate 10
A fixed blade 17 is fixed in pressure contact with the movable blade 13 by a leaf spring 18, and this fixed blade 17
The cutting edge 17a is formed into a gentle chevron shape with a protruding center. The drive shaft 16 has a drive rotating member 1
One end of the movable blade 9 is fixed, and the other end of the movable blade 13 is rotatably provided at the other end of the drive rotation member 19 via a support shaft 20. The drive shaft 16 is used by being directly connected to the output shaft of a motor (not shown).

Therefore, when the motor is started and the drive shaft 16 is rotated once from the state shown in FIG. 1a,
The paper is cut after one cycle of b, c, and a.
Figure b shows the time when cutting is started, and figure c shows the time when cutting is finished.

The movable blade 13 is moved sequentially from one end shown in FIG.
The shape of the movable blade 13 may be simple because the cutting is performed by moving to the other end shown in FIG. In addition, the rotation angle of the drive shaft 16 used during cutting is close to about 100 degrees, and the rotation angle of the rotary cutter 4 of the rotary cutter shown in FIG. Cutting force is required compared to . The strength of the movable blade 13 and the fixed blade 17 can be lowered by the smaller cutting force. Further, in order to move the movable blade 13, it is sufficient to simply rotate the drive shaft 16, and since the movable blade 13 is not a rotary blade, it can be manufactured at low cost. Furthermore, since the movable blade 13 moves laterally just before the end of cutting, the fixed blade 17 can cut cleanly at the end without folding when cutting paper or the like, even with a backing plate without a blade. Furthermore, speaking about torque, the cutting start point shown in Figure 1b is
Due to the lever principle, it is extremely small, and at the end of the cut shown in Figure c, the tangential direction of the rotating circle of the drive rotating member 19 is close to 90 degrees with respect to the direction of the cutting force, and here too, it is much smaller than the cutting force. This results in less torque. Rather, the torque for lifting the movable blade 13 is greater. However, since the weight of the movable blade 13 is a fraction of the cutting force, the cutting force can be cut with very little torque compared to a conventional rotary cutter.

3 and 4 show other embodiments of the invention. This embodiment shows a case where a contact plate 21 is used in place of the fixed blade 17 of the previous embodiment. The movable blade 13 is
It consists of a holder 22 and a razor-shaped blade 23 embedded in the holder 22. Further, elastic bodies 24 and 25 made of rubber or the like are provided on both sides of the cutter 23. The backing plate 21 has an escape groove 21a in the part corresponding to the cutter 23.
An elastic body 26 is provided so as to protrude from the upper surface of the contact plate 21 in correspondence with the elastic body 25 on the paper feeding side.

In this embodiment, since cutting is performed only with the movable blade 13, the cutting force is large at the beginning of the cut, making it difficult to cut. Once the notch is made, subsequent cutting is easy. Therefore, a taper 21b is formed on the upper surface of the backing plate 21 so that the shear angle becomes large only at the beginning of cutting. This allows light and easy cutting with a small cutting force. Further, elastic bodies 24 are provided on both sides of the cutter 23,
25, the paper is cut while being pressed against the backing plate 21 by the elastic bodies 24 and 25, and can be cut cleanly. Further, since the elastic body 26 is disposed on the paper feeding side of the backing plate 21, the end face of the cut paper on the paper feeding side is pushed upward from the backing plate 21. Therefore, the paper can be fed without getting caught in the escape groove 21a.

In the above embodiment, the cutting edge 17a of the fixed blade 17 and the upper surface of the contact plate 21 are formed into a gentle chevron shape with the center protruding, but conversely, the movable blade 13 and the cutter 23 are formed so that their centers protrude gently downward. It may be formed into

[Effect of idea]

As is clear from the above explanation, according to the present invention, when cutting is finished, the cutting start side of the movable blade begins to return, and after cutting is finished, the drive rotating member rotates at a rotation angle that is far smaller than the rotation angle required for cutting. Sheets can pass through. Therefore, the sheets can be fed immediately after cutting, and the sheets can also be cut without stopping.

Further, since the rotation angle of the drive rotation member required for cutting is large, the rotation angle of the driven rotation member is small, and the rotation angle of the drive rotation member required for cutting can be set large, a small drive torque (cutting force) is required. The strength of the movable blade and the fixed blade is reduced by the amount of the cutting force.

Furthermore, since the movable blade also moves laterally at the point where cutting begins, not only a fixed blade with a blade, but also a backing plate without a blade will start cutting cleanly when cutting paper or the like. Furthermore, regarding torque, since cutting is performed from the end at a substantially constant speed, the torque is substantially constant.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which a is a front view before operation, b is a front view at the start of cutting, c is a front view at the end of cutting, and FIG. 2 is a sectional view of FIG. FIG. 3 shows another embodiment of the present invention, in which a is a plan view, b is a front view, FIG. 4 is a sectional view of FIG. 3b, and FIGS. 5, 6, and 7 are respectively conventional It is a front view showing an example. 10... fixed plate, 11... driven rotating member, 13
...Moving blade, 16...Drive shaft, 17...Fixed blade,
19... Drive rotating member, 21... Contact plate, 21b...
... Taper, 22 ... Holder, 23 ... Cutler, 2
4, 25, 26...Elastic body.

Claims (1)

[Claims for Utility Model Registration] (1) One end of a driven rotating member rotatably provided on a fixed part is rotatably provided, and a driving rotating member fixed to a drive shaft rotated by a drive source. In a cutter that has a movable blade whose other end is rotatably provided and sequentially cuts paper, etc. from one end to the other end by moving the movable blade relative to a fixed blade or a backing plate, the length of the driving rotating member is , A cutter characterized in that the length of the driven rotating member is shorter than that of the driven rotating member. (2) The cutter according to claim (1) of the utility model registration, wherein the backing plate is tapered so that the shear angle becomes large at the cutting start portion. (3) The movable blade is provided with elastic bodies on both sides, and the contact plate is provided with an elastic body protruding from the top surface of the contact plate in correspondence with the elastic bodies on the feeding side of paper, etc. The cutter according to claim (1) of the utility model registration claim, characterized in that: