JPH0214948Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a mechanism for cutting by sliding two opposing blade bodies.

[Conventional technology]

Generally, this type of mechanism, for example, as shown in Fig. 4, moves the movable blade E ₂ relative to the fixed blade E ₁ to create a double-edged body.
In the case of cutting a workpiece interposed between the blade parts _c1 and _{c2 of E1 and E2 ,} in order to prevent the workpiece W from entering between the two blade parts due _to stress during cutting, etc. The movable blade E ₂ has a fixed blade in addition to the force F ₁ in the cutting direction.
A force F ₂ that presses the side surface of E ₁ is constantly applied by a spring S or the like.

[Problem that the invention attempts to solve]

However, in the conventional cutting mechanism described above, a constant pressing force is applied to the movable blade by the spring S etc.
E ₂ and therefore
This pressing force F ₂ was set to a fairly large value assuming that the object W to be cut is strong.

Furthermore, when cutting with two blades, it is necessary to always make point contact between the two blades, so there is a serious problem of wear and damage to the blades due to pressure between the two blades.

Therefore, good sharpness can be obtained, but on the other hand, more pressing force than necessary is applied to the object to be cut, which has low strength, and as a result, the double-edged portion c ₁ ,
There was a problem in that as c ₂ wore out, the loss of the force applied to the movable blade E ₂ in the cutting direction also increased due to the frictional force generated between the two blades.

However, it may be possible to replace or adjust the spring S depending on the strength of the object to be cut.
In reality, it is nearly impossible to perform such work each time at a work site, etc., and it is not practical.

This idea was created by focusing on the above-mentioned problem, and it cuts while applying the minimum necessary joining force to the double-edged part according to the strength of the object to be cut, without any adjustment or replacement work. The purpose of the present invention is to provide a cutting mechanism that can significantly reduce wear on the blade.

[Means for solving problems]

This device guides the blade in the cutting direction on at least one of the blade parts of two blade bodies provided at opposing positions, and supports the blade so that it can rotate in the direction of crimping. A support member having a rotational fulcrum is provided, and a portion of the lower end of the one blade body offset from the rotational fulcrum is used as a cutting power point.

[Effect]

In this device, when the operator applies force in the cutting direction from the cutting force point to the blade body, since the cutting force point of the blade body is offset, both blade parts are crimped around the rotational fulcrum of the support member. It moves in the cutting direction while generating a moment in the direction, and cuts the object by sandwiching it between it and the other blade. At this time, the pressing force due to the moment acting between the two blades and on the object to be cut increases in proportion to the force applied in the cutting direction.
Only the moment (joint force between the two blades) will not become large. In other words, the blade is cut when the cutting value is reached, and a pressing force greater than the moment required for cutting is not applied between the two blades, and the blade portions are not worn out unnecessarily.

[Example of idea]

Embodiments of this invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a diagram showing a first embodiment of this invention. In the figure, reference numeral 1 denotes a fixed blade as a blade fixed to a predetermined support 2, and a blade portion 1a having a predetermined inclination is formed at the tip. Reference numeral 3 denotes a cylindrical movable blade support metal fitting, and a movable blade 4 as a blade body is fixed to the distal end of the metal fitting in a position facing the fixed blade 1. In addition, like the fixed blade 1, this movable blade 4 is formed with an inclined blade part 4a, and at the cutting position, both blade parts 1a and 4a are partially joined as shown in FIG. 1a. There is. Reference numeral 5 denotes a cylindrical sliding support fitting (supporting member) formed with an insertion hole 5a.
The movable blade support fitting 3 is inserted into the insertion hole 5a. Further, the insertion hole 5a is provided with a key 5b protruding from its inner circumferential surface, and this key 5b is fitted into the groove 3a formed in the longitudinal direction of the movable blade support fitting 3, so that the sliding support fitting 5 is inserted through the key 5b. Hole 5
Rotation within a is restricted and movement is possible only in the longitudinal direction. Furthermore, on the outer circumferential surface of the sliding support fitting 5, two shaft bodies 5 are provided as pivot points on the same straight line.
c, 5c are provided protrudingly, and these shaft bodies 5c, 5c
is rotatably supported by a predetermined support body 6.

Reference numeral 7 denotes a return spring whose one end is connected to the lower part of the movable blade support fitting 3 and the other end is connected to the support body 8, and the connection point _P1 with the movable blade support fitting 3 is the blade part of the fixed blade 1. It is located at a distance e ₂ to the right from the straight line a connecting the centers of the protrusions 5c and 5c from 1a. 9 is a magnet rod that is brought into contact with the lower part of the movable blade support fitting 3, and the main body of the magnet (not shown) is
Protruding suction is achieved by turning ON and OFF. The point of contact (point of force for cutting) of the magnet rod 9 with the movable blade support fitting 3 is located a distance e ₁ to the left from the straight line a.

Based on the above configuration, the operation will be explained next.

When not cutting, the magnet (not shown) is turned OFF and the magnet rod 9 is in the suction state, and the movable blade support 3 is located downward due to the biasing force of the spring 7, and is in the initial position shown in FIGS. 1a and 1b. .

Here, when a desired object to be cut is positioned between the double blade parts 1a and 4a and a cutting command is issued, a magnet (not shown) is activated, and the magnetic rod 9 protrudes and presses the movable blade support fitting 3. At this time, the pressing force of the magnet rod 9 acts directly on the point P ₂ away from a, so this pressing force causes the movable blade 4 to
The component force F ₁ in the cutting direction along straight line a, and the first
In the figure, a pressing force F ₂ is exerted by a clockwise moment about the shaft bodies 5c, 5c. Therefore, the movable blade 4 is pressed toward the side surface of the fixed blade 1 by the force F ₂ and moves in the cutting direction by the force F ₁ to cut the object to be cut between it and the fixed blade 1. do.
During this cutting, the pressing force F ₂ between the two blades is
It is expressed as a component force due to the moment of the pressing force F of the magnet rod 9, which is the driving source of the magnetic rod ₉ , that is, the force _F1 in the cutting direction, and these component forces F1 _{and F2} are in a proportional relationship. Therefore, if the strength of the object to be cut increases and the force F ₁ in the cutting direction increases, the pressing force F ₂ due to the moment will increase accordingly, and conversely, the strength of the object to be cut decreases and the force F 1 in the cutting direction increases. If ₁ becomes small, F ₂ will also become small accordingly. In other words, as in the conventional case, the force F ₁ in the cutting direction increases or decreases depending on the strength of the object to be cut, but in this embodiment, the force F ₂ in the direction of crimping the double blades also increases or decreases depending on the strength of the object. It changes to an appropriate value depending on the As a result, not only good cutting is performed, but also the double-edged portions 1a, 4a do not slide into contact with each other with more force than necessary, and the wear of the double-edged portions 1a, 4a is significantly reduced compared to conventional ones. Note that when the magnet is turned off after cutting, a force R in the opposite direction to the cutting direction and a moment force in the direction of pressing the fixed blade 1 act on the movable blade 4 due to the biasing force of the spring 7. The movable blade 4 returns to its initial position as shown in the figure, and a portion of the blade portion 4a of the movable blade 4 comes into light contact with the blade portion 1a of the fixed blade 1. Furthermore, during no-load cutting when there is no object to be cut, there is no stress from the object to be cut, so naturally the movable blade 4 operates with a very small force F. The pressure F ₂ becomes an extremely small value, and the blade portions 1a and 4a are hardly worn out.

Next, a second embodiment of this invention will be explained based on FIG. In the drawings, the same or equivalent parts as in the first embodiment are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the figure, reference numeral 10 denotes a fixed blade holder comprising a cylindrical portion 10a having a hole _10a1 in the center of the lower surface and a support portion 10b, and the fixed blade 1 is fixed to the upper end of the support portion 10b. Reference numeral 11 denotes a support member fixed to the inner surface of the cylindrical portion 10a of the fixed blade holder 10 with screws 12, which includes a disk portion 11a having an insertion hole _11a1 in the center, and a cylindrical column protruding from the lower surface of the disk. A through hole 11b 1 having a larger diameter than the insertion hole 11a ₁ of the disc portion 11a is formed in the columnar portion 11b to communicate with the insertion hole _{11a 1 ,} and a locking groove extending in the diametrical direction. 11b ₂ is formed on the lower surface. Furthermore, by loosening the screw 12, the mounting position of the support member 11 to the cylindrical portion 10a can be changed within the range of the arc-shaped elongated hole _10a2 formed in the disc portion 11a. There is. Reference numeral 13 denotes a movable blade holder that holds the movable blade 4 in a position facing the fixed blade 1, and includes a support portion 13a that is inserted through the movable blade 4 and an actuating portion 13b that fits into the locking groove _11b2 . Further, this operating portion 13b includes the fixed blade 1
Straight line b connecting the blade part 1a and the center of the insertion hole _11a1
A return spring 7 is connected to a position _P3 that is more biased to the right, and a magnet rod 9 is in contact with a position _P4 that is more biased to the left.

The second embodiment of this invention is constructed as described above, and when cutting, the magnet is actuated to project the magnet rod 9, as in the first embodiment. As a result, in addition to the force F ₁ in the cutting direction, a pressing force F ₂ is applied to the movable blade holder 13 due to a moment using the inner peripheral surface of the insertion hole 11a ₁ formed in the disk portion 11a as a rotational fulcrum. As in the first embodiment, since cutting is performed with a value corresponding to the strength of the object to be cut, wear of the double edge portions 1a and 4a is suppressed to a minimum. Furthermore, according to this embodiment,
By loosening the screw 12 and changing the mounting position of the guide member 11, the blade part 1a of the fixed blade 1 and the movable blade 4 can be separated.
The angle between the two blades and the blade portion 4a can be changed, making it possible to adjust the contact state between the two blades and maintain good sharpness.

Next, a third embodiment of this invention will be described with reference to FIG.

This third embodiment has two opposing blades in the first and second embodiments, one of which is fixed and the other movable, whereas both blades are movable relative to each other in the cutting direction. That is.

To explain based on the figures below, the blade body 14 in FIG.
is fixed to the first support member 15, and the second blade body 1
6 is fixed to the second support member 17, and the second
The supporting members 17 are fitted into a cylindrical fitting hole 15a formed in the first supporting member 15, and are normally moved by a force R in the direction of separating them from each other by a spring 18 interposed between the supporting members 15 and 17. The two blades 14a and 16a are lightly connected due to the bias _e2 of the force point.

When cutting, the portions P _{5 and} P 6 of the ends of both support members 15 and 17 that are offset by e ₁ to the left by the straight line c connecting the first blade portion 14a and the center of the fitting hole _15a are cut. Press each other in the cutting direction. Due to this pressing force F, F', the double-edged bodies 14, 16
In addition to the forces F ₁ and F ₁ ' in the cutting direction,
The pressing force due to the moment toward the side surface of the blade of the opposing blade with the inner circumferential surface of 5a as the rotational fulcrum.
F ₂ and F ₂ ' are generated (see FIG. 3e) and cutting is performed. In addition, in this case as well, the pressing force F ₂ of the double-edged part,
F ₂ ′ is the force F ₁ in the cutting direction, as in the previous embodiment;
Since the force is proportional to F ₁ ', no unnecessary force is applied to the double edge portions 14a, 16a.

Further, in this third embodiment, as a driving source for both supports, a magnet may be used as in the first and second embodiments, or other driving force may be used, and the device itself may be moved. suitable for cutting mechanisms.

Furthermore, the drive source used in the first and second embodiments is not limited to magnets, but other sources may also be used, and this invention is not limited to the above embodiments, and the scope of its application may vary. The process ranges from thread cutting for small items to thread cutting for large items.
It can be applied to a wide range of applications, including machine tools that cut steel strips.

[Effect of idea]

As explained above, according to this invention, it is possible to perform cutting while always applying the necessary minimum bonding force to the double-edged parts according to the strength of the object to be cut, without having to replace or adjust any parts. This has the effect of significantly reducing wear on the blade.

[Brief explanation of the drawing]

1A and 1B are diagrams showing a first embodiment of this invention, FIG. 1A is a front view, and FIG. 1B is a longitudinal sectional side view of FIG. 1A. Figures 2 a, b, c, and d show a second embodiment of this invention, in which a is a vertical front view, b is a partially cutaway side view of the same as shown in a, and c is a partially cutaway side view of the same figure. Figure d is a plan view of what is shown in figure a, and figure d is a bottom view of what is shown in figure a. Figure 3 a, b, c, d,
Figure e shows a third embodiment of this invention, Figure a is a vertical front view, Figure b is a side view of the thing shown in Figure A, and Figure c is a plan view of the thing shown in Figure A. , Figure d is a bottom view of the one shown in Figure A, and Figure e is a bottom view of the one shown in Figure A.
Explanation showing the force applied to the blade body, Figures 4a, b, and c are conceptual diagrams of the conventional cutting mechanism, where figure a is a side view, figure b is a front view, and figure c is the cutting according to figure b. FIG. 3 is a front view showing a cutting operation state of an object. 1...Movable blade, 1a...Blade portion, 4...Fixed blade,
4a...Blade part, 14, 16...Blade body, 14a, 1
6a...blade portion, 5...sliding support metal fitting (support member),
11... Support member, 15... First support member,
P ₂ , P ₄ , P ₅ , P ₆ ... Power points for cutting.

Claims (1)

[Scope of utility model registration request] A cutting mechanism configured to cut a workpiece interposed between the blades by sliding the blades of two blades disposed at opposite positions to each other, wherein at least one of the blades is provided with a support member having a rotation fulcrum that guides the blade in the cutting direction and rotatably supports both blade portions in the direction of crimping, and the rotation at the lower end of the one blade. A cutting mechanism characterized in that a point offset from a fulcrum is used as a cutting power point.