JPH0378240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutter device for cutting an object between a plate-shaped blade and two members facing each other in close proximity to each other. This invention relates to a technique for preventing sharpness from becoming poor due to chips and the like getting stuck in the gap between two members and pushing the two members apart.

[Background of the invention]

For example, in image forming apparatuses such as printers and copying machines, sheet cutter devices are used to cut rolled sheets into desired lengths. This type of device generally shears the sheet between a blade and a receiving member.

The present applicant has already developed the following sheet cutter device and is currently filing an application as Japanese Patent Application No. 63-66780. This consists of (a) a circular blade whose cutting edge is formed along the circumference centered on the center line of the rotating shaft, and (b) a circular blade whose cutting edge is close to each other and faces each other, sandwiching the outer periphery of the circular blade from both sides. 2 members, and (c) a circular blade drive device that rotates the circular blade sandwiched between the two members around the center line of the rotating shaft and moves it along the surfaces of the two members. In this developed device, the surface of one of the two members on the rotating shaft side is used as a sheet receiving surface, and the sheet is sheared between the sheet receiving surface and the cutting edge of the circular blade. That is, the member having the sheet receiving surface functions as a receiving member that shears the sheet in cooperation with the circular blade.

[Problem to be solved by the invention]

In the above-mentioned developed device, the outer periphery of the circular blade is sandwiched between the two members with a predetermined force so that there is no gap between the circular blade and the receiving member, which improves the quality of the cutting edge of the sheet. It is important to keep the condition in good condition.

However, subsequent research by the present inventor revealed that the developed device had the following problems. In other words, when the sheet is sheared, there is always a gap between the two members due to the presence of the circular blade between the two members, and in that gap, the chips generated due to shearing and the sheared Dust, etc. that had been attached to the sheet from before enters the sheet, and these chips, etc., are not discharged to the outside and accumulate in the gap between the two members.
In such a situation, chips, etc. push the two members apart, reducing the force that holds the blade between the two members, creating a gap between the blade and the receiving member, resulting in poor sharpness and the cutting edge of the sheet. becomes defective.

Note that this problem is not limited to the above-mentioned developed device; a part of a plate-shaped blade is sandwiched from both sides by two members facing each other in close proximity, and the blade is moved along the surface of the two members by a blade drive device. A blade-clipping type cutter device that shears an object between the blade and one of two members (a member functioning as a receiving member) by moving the blade is also available.

The invention as claimed in claim 1 has been made with the object of solving the problem of clogging of chips etc. in the blade clamping type cutter device.

The invention as claimed in claim 2 has been made with the object of solving the problem of clogging with chips, etc., in blade clamping type devices, particularly rotary blade clamping type cutter devices in which the blades rotate.

In addition to the problem of the invention of claim 1, the invention of claim 3 aims to ensure that chips, etc. are discharged almost equally well from any part of the two members in the direction of blade movement. It is what was done.

[Means to solve the problem]

The gist of the invention of claim 1 is that, in the blade holding type cutter device including the two members, a blade and a blade drive device, at least one of the two members is made of a plate material, and a plurality of blades are provided on the plate material along the moving direction of the blade. This is because a through-hole is formed.

The gist of the invention of claim 2 is to add the constituent features of claim 1 to the rotary blade clamping type cutter device.

The gist of the invention according to claim 3 is that in the cutter device according to claim 1 or 2, a large number of long holes are formed in the plate material as through holes that are inclined with respect to the moving direction of the blade, and two holes adjacent to each other on the plate material are formed as through holes. The two elongated holes partially overlap each other in the direction perpendicular to the direction of movement of the blade.

[Action and effect of the invention]

In the cutter device according to the inventions of claims 1 and 2, even if chips, etc. enter the gap between the two members when the object is sheared by the blade, the chips, etc. are not removed from the through hole formed in the plate material. It is discharged to the outside.

Therefore, according to the inventions of claims 1 and 2, it is possible to prevent chips and the like from getting stuck in the gap between the two members and pushing them apart, thereby maintaining good sharpness and shearing quality of the object. Effects can be obtained.

In the cutter device according to the invention of claim 3,
Since two adjacent elongated holes partially overlap each other in the direction perpendicular to the direction of movement of the blade, there is always a part of the elongated hole at any position in the direction of movement of the blade. Chips, etc. that have entered the gap at any position in the direction of movement of the blade are discharged to the outside with approximately the same efficiency.

Further, in the cutter device according to the third aspect of the invention, since the elongated hole is inclined with respect to the direction of movement of the blade, the range in which one elongated hole is responsible for discharging chips, etc. in the direction of movement of the blade is The width of each slot (dimension parallel to the direction of blade movement) is approximately determined by the length (longitudinal size of the slot) and the angle of inclination of the slot with respect to the direction of blade movement. Without increasing the size, chips etc. that have entered the gap between the two members from any direction in the direction of movement of the blade can be effectively discharged.

For example, the same objective can be achieved by providing one large elongated hole in the plate material that extends along the direction of movement of the blade. However, in this case, the rigidity of the plate material decreases significantly and the force with which the plate material pinches the blade also decreases, resulting in a gap between the blade and the receiving member, resulting in poor sharpness and a decrease in the quality of the sheared edge of the object. The situation cannot be avoided. Therefore, it becomes necessary to increase the rigidity of the plate material, such as by making the plate thicker or using a material with higher rigidity, resulting in a problem of increased material costs. However, according to the third aspect of the invention, the decrease in rigidity of the plate material due to the formation of the elongated hole is suppressed to a small extent, so the occurrence of a gap between the blade and the receiving member can be effectively avoided, and the problem of increased cost can be avoided. Does not occur.

The invention of claim 3 is characterized in that one of the two members is a plate material, and it is only permissible to provide through holes in that plate material, and furthermore, it is permissible to provide only one row of through holes along the direction of movement of the blade. This is particularly effective when On the other hand, if one of the two members is a plate and it is only permitted to provide through holes in that plate, it is permitted to provide multiple rows of through holes along the direction of movement of the blade. The above objective can also be achieved by shifting the positions of the through holes in the plural rows from each other with respect to the direction of movement of the blade.Also, the two members are both plate materials, and the through holes are provided in both of the plate materials. If it is permissible to provide a blade, the above objective can also be achieved by shifting the positions of the through holes of the two members from each other with respect to the direction of movement of the blade.

Further, in the cutter device according to the invention of claim 3, the elongated hole is inclined with respect to the direction of movement of the blade, and two adjacent elongated holes are partially arranged in a direction perpendicular to the direction of movement of the blade. Although they are overlapped, it is possible to increase the efficiency of discharging chips, etc., while suppressing the decrease in rigidity of the plate due to the elongated holes, even if the two elongated holes are not overlapped, just by tilting the elongated holes.

In addition, as an embodiment of the present invention in which a part of the blade is sandwiched between the two members from both sides, one of the two members is made of a material that is easily deformed elastically, and the other is made of a material that is difficult to deform, and both of these members are made of a material that is difficult to deform. In addition to being fixed to the fixed member, a part of the blade may be elastically pressed against the one of the blades, or both of the two members may be made of a material that is difficult to deform, and the first member, which is one of them, is fixed to the fixed member. On the other hand, the other second member is supported by a support member so as to be movable in a direction opposite to the first member, and the second member is pressed against a part of the blade by the action of a biasing means. , the two members may be both made of materials that are easily deformed elastically, and a part of the blade may be elastically sandwiched between the two members, or other forms may be used.

Further, the cutter device according to the present invention can be provided with a discharge means for forcibly discharging chips and the like that have entered the gap between the two members to the outside from the through hole.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a sheet cutter device for cutting a rolled sheet into a desired length will be described in detail with reference to the drawings.

FIG. 2 is an exploded perspective view of the main parts of a sheet cutter device according to an embodiment of the present invention. 10 is a disk-shaped circular blade, and cutting edge 1 is formed along the circumference of the blade.
2 is formed. The circular blade 10 is arranged in a posture intersecting the sheet S to be sheared by the sheet cutter device. Reference numeral 14 denotes a pinion, and cylindrical portions 16 coaxially extend from both end faces of the pinion, respectively, as shown in FIG. One cylindrical portion 16 is inserted into the shaft hole 18 of the circular blade 10 so as not to be relatively rotatable, and the pinion 14 and the circular blade 1
0 and the mutually opposing end surfaces are brought into contact with each other.

On both sides of the circular blade 10 and the pinion 14, thin plate-like frames 24 and 26 are arranged parallel to the circular blade 10. Both frames 24, 2
Each of the two cylindrical portions 16 has a long hole 28 formed therein and extends in parallel to the other.
8 so as to be slidably inserted therein. 32 is a spacer, which has a function of preventing the cutting edge 12 of the circular blade 10 from coming into direct contact with the frame 26 and causing premature wear of the cutting edge 12, and a mechanism that allows the circular blade 10 to rotate smoothly. fulfill. Frame 24 and 2
6 is made slightly larger than the sum of the thicknesses of the circular blade 10, pinion 14, and spacer 32, and movement of the circular blade 10 and the like along the elongated hole 28 is allowed, but their rotational axis is both frame 2
4, tilting from a state perpendicular to the plane of 26;
Also, movement in the width direction of the elongated hole 28 is prevented. The distance between frames 24 and 26 is maintained constant by a spacer 34 shown in FIG.

A thin plate-like rack member 36 is arranged between the circular blade 10 and the frame 24 and parallel to them.
A rack 38 that engages with the pinion 14 is formed in the rack member 36 in parallel with the elongated hole 28. A carriage shaft 42 is inserted through the pinion 14 and the cylindrical portion 16 so as to be relatively rotatable, and when the carriage shaft 42 is moved in the longitudinal direction of the elongated hole 28, the circular blade 10 is rotated and moved. There is.

A pair of leaf springs 44 and 46 are arranged below and parallel to the circular blade 10. A pair of leaf springs 4
The lower ends of the blades 4 and 46 are fixed to the frame 50 in close contact with each other, and the upper ends elastically sandwich the lower part of the outer circumference of the circular blade 10 from both sides. In addition, the above frames 24, 26 and 50
The relative positional relationship between the two is kept constant by a holding member (not shown).

As shown in FIG. 2, in each of the pair of leaf springs 44, 46, a large number of elongated holes 52 are formed as through holes and lined up at a constant pitch along the longitudinal direction of the leaf springs 44, 46. Each elongated hole 52 corresponds to each leaf spring 4.
The two leaf springs 4, 46 are shaped like strings and are inclined at the same angle in the same direction with respect to the longitudinal direction of the leaf springs.
As shown in FIG.
46 are partially overlapped in the direction parallel to the width direction of the leaf springs 46, and the length of the portion of the elongated hole 52 corresponding to each position in the longitudinal direction of the leaf springs 44, 46 (two elongated holes 52 correspond to each position) In this case, the sum of the lengths of the two elongated holes 52) are all made equal.

The leaf springs 44 and 46 are the same part, and the leaf springs 44 and 46 are stacked in the thickness direction with one of the leaf springs 44 and 46 turned over. As a result, the large number of elongated holes 52 in the leaf springs 44 and 46 are inclined in opposite directions with respect to the longitudinal direction of the leaf springs 44 and 46. In this embodiment, when the leaf springs 44 and 46 are stacked in this way, the upper and lower sides of each elongated hole 52 of the leaf spring 44,
The positions of the elongated holes 52 in each of the leaf springs 44 and 46 are determined so that the upper and lower sides of each of the elongated holes 52 in the leaf spring 46 are directly opposed to each other. In this embodiment, the circular blade 10 and each elongated hole 52 do not directly face each other, and when the circular blade 10 reaches, the leaf spring 4
4 and 46 are not easily deformed, the uppermost side of each elongated hole 52 is positioned below the lower part of the outer periphery of the circular blade 10. Therefore, if this is not necessary, the circular blade 1
0 and each elongated hole 52 directly face each other, the leaf spring 44,
It is possible to select the location of the slot 52 in the slot 46.

Attached to the opposite side of the frame 24 from the rack member 36 are two belt pulleys 54 and 56, as shown in FIG. They are provided at a distance longer than the elongated hole 28 in the longitudinal direction of the elongated hole 28. A timing belt (hereinafter simply referred to as a belt) 5 is attached to the belt pulleys 54 and 56.
8 is wrapped around the belt 58, and a plate-shaped carriage 60 is fixed to a straight portion of the belt 58 extending along the elongated hole 28. The carriage 60 is kept in a position in which its longitudinal direction is always parallel to the straight portion of the belt 58 by a guide (not shown), and the carriage shaft 42 is attached to the carriage 60.

An input gear 70 is coaxially fixed to the belt pulley 56, and the input gear 70 is connected to a reduction gear 72.
The output gear 76 of the electric motor 74 meshes with the output gear 76 of the electric motor 74 via the . Belt pulley 5 of frame 24
A rotation shaft 78 is erected on the mounting surfaces of 4 and 56, and a T-shaped plate 80 is rotatably attached to the rotation shaft 78. A belt pulley 56 is rotatably attached to the intermediate portion of the plate 80 in the longitudinal direction, and when the plate 80 rotates, the belt 56
8 tensions are adjustable. After the tension is adjusted, the plate 80 is fixed to the rack member 36 by screws 82 and nuts 84. The reduction gear 72 is rotatably and non-releasably attached to the rotating shaft 78, so that even if the angle of the plate 80 is changed for tension adjustment, the output gear 76
The engagement of the input gear 70 is maintained. Electric motor 74 is attached to frame 26 .

Next, the operation will be explained.

Usually, the circular blade 10 is located at a position parallel to the width direction of the sheet S from the paper feeding path of the sheet S, that is,
It is retracted to the left end position or right end position in FIG. Hereinafter, the case where the circular blade 10 is currently retracted to the left end position will be described, and the case where the circular blade 10 is currently retracted to the right end position is the same, so the description will be omitted.

When shearing the sheet S, first
is inserted into the sheet cutter device from the outside, and the sheet S is placed on the upper surface of the leaf springs 44 and 46. When the leading edge of the sheet S reaches the desired distance from the leaf springs 44 and 46, the electric motor 74 is rotated in the forward direction to rotate the belt pulley 56 counterclockwise in the figure, and the carriage 60 is moved to the left end in the figure. Move forward towards the right end. As the carriage 60 moves forward, the circular blade 10 moves forward while being rotated by the rack 38 and pinion 14.

At this time, the sheet S is connected to the tip of the cutting edge 12,
Shearing occurs between the leaf springs 44 and 46 and the upper surface of the leaf spring 46 near the tip of the cutting edge 12. That is, in this embodiment, the leaf spring 46 functions as a receiving member. Then, when the circular blade 10 finishes passing through the sheet S, the sheet S is cut into a desired length.

As described above, the leaf springs 44 and 46 are in close contact with each other so that there is almost no gap between them, but when the circular blade 10 reaches there, the gap at that position is enlarged. Therefore, when the sheet S is sheared, chips generated due to shearing, dust, etc. that have adhered to the sheet S before shearing may enter the gap between the leaf springs 44 and 46. However, the chips, etc. that have entered are discharged to the outside from the elongated holes 52 of the leaf springs 44, 46, as shown in an example in FIG.
It will not accumulate in the gap between the leaf springs 44 and 46 and push the leaf springs 44 and 46 apart.

When the cutting of the sheet S is completed and the circular blade 10 reaches the rightmost retracted position in FIG. 2, the electric motor 74 is stopped and both the carriage 60 and the circular blade 10 are stopped at the rightmost position.

As is clear from the above description, in this embodiment, the carriage shaft 42, the belt pulley 54,
56, belt 58, electric motor 74, pinion 1
4. The rack member 36 and the like constitute a circular blade drive device 86 which is a blade drive device.

Additionally, due to the action of only the elongated hole 52 on one side of the leaf springs 44, 46, chips etc. that have entered through the gap between the leaf springs 44, 46 can be prevented from entering at any position in the direction of movement of the circular blade 10. Even if there is, it can be discharged to the outside. Therefore,
When a large number of long holes 52 are formed in both the leaf springs 44 and 46 as in this embodiment, chips and the like are discharged with high efficiency.

Further, in this embodiment, the outer peripheral portion of the circular blade 10 is elastically sandwiched between the two leaf springs 44 and 46, and a large number of through holes 52 are formed in each of the leaf springs 44 and 4.
6 are arranged at a constant pitch in the longitudinal direction and are inclined in the same direction and at the same angle with respect to the longitudinal direction, so that the rigidity of each leaf spring 44, 46 is maintained almost uniformly along the longitudinal direction. Since the force with which each leaf spring 44, 46 pinches the circular blade 10 is maintained almost uniformly, the deflection of the outer circumference of the circular blade 10 during shearing is prevented, and the contact between the cutting blade 12 and the leaf springs 44, 46 is prevented. It is also possible to achieve the effect that shearing is performed well without creating any gaps.

Further, in this embodiment, the long hole 52 of the leaf spring 44 and the long hole 52 of the leaf spring 46 overlap each other, and the hole portion that penetrates straight through both the leaf springs 44, 46 is It is uniformly distributed both in the longitudinal direction and in the width direction on the surface of the surface. Chips and the like that have entered the gap between the leaf springs 44 and 46 are discharged from a hole that passes through both of the leaf springs 44 and 46 rather than from a hole that penetrates only one of the leaf springs 44 and 46. In this embodiment, chips and the like can be discharged more effectively in this embodiment.

Note that in this embodiment, the leaf springs 44 and 46
The upper and lower sides of the elongated holes 52 of the leaf springs 44 and 46 overlap each other, but as shown in FIG. The leaf springs 44 and 4
6 can also be overlapped. In this case, as shown in FIG. 5, elongated holes 52 are formed almost continuously along the moving direction of the circular blade 10 at positions close to the lower ends of the outer peripheral parts of the circular blades 10 in the leaf springs 44 and 46. Because of this presence, most of the chips and the like are discharged to the outside immediately after entering the gap between the leaf springs 44 and 46, resulting in the effect that the chips and the like are discharged quickly.

FIGS. 6 and 7 show a sheet cutter device which is an embodiment including a through hole having a different shape and arrangement form from the elongated hole 52 in the above two embodiments.
Note that since this embodiment has common elements other than the through hole with the above embodiment, only the through hole will be described below.

In this embodiment, each of the leaf springs 90 and 92 as the two members of the present invention is provided with a rectangular long hole 94 that is long in the width direction of the leaf springs 90 and 92, instead of the long hole 52 in the previous embodiment. ing.

Both the leaf springs 90 and 92 are the same part, and the leaf springs 90 and 92 are stacked one on top of the other with one of them turned over. In the overlapped state, each elongated hole 94 of the leaf spring 90 and each elongated hole 94 of the leaf spring 92
Each leaf spring 90,
The location of the elongated hole 94 within the slot 92 is determined.

In this embodiment, due to the presence of the elongated holes 94 in both the leaf springs 90 and 92, elongated holes 94 are formed that are continuously lined up along the moving direction of the circular blade 10. Even if the entry position into the springs 90, 92 changes with the movement of the circular blade 10, chips and the like can be efficiently discharged to the outside.

The three embodiments of the present invention have been described in detail above.
These are literally examples, and the present invention may be implemented in various modifications and improvements based on the knowledge of those skilled in the art, such as applying the present invention to a cutter device for cutting objects other than sheets. I can do it.

[Brief explanation of drawings]

FIG. 1 is a front view showing a circular blade and a pair of leaf springs in a sheet cutting device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts of the sheet cutting device, and FIG. 3 is an exploded perspective view of the main parts of the sheet cutting device. FIG. 3 is a side sectional view of the circular blade and its peripheral portion. FIG. 4 is a front view showing a circular blade and a pair of leaf springs in a sheet cutter device which is an embodiment in which the arrangement of elongated holes is different from the above embodiment, and FIG.
FIG. FIG. 6 is a front view showing a pair of leaf springs in a sheet cutter device which is an embodiment in which the shape and arrangement of the elongated holes are different from those of the above two embodiments, and FIG. 7 is a cross-sectional view taken in FIG. be. 10... Circular blade, 12... Cutting edge, 44,4
6, 90, 92...plate spring, 52, 94...elongated hole, 86...circular blade drive device.

Claims (1)

[Claims] 1. Part of a plate-shaped blade is sandwiched from both sides by two members facing each other in close proximity, and the blade is moved along the surfaces of the two members by a blade drive device. In the cutter device for shearing an object between a blade and one of two members, at least one of the two members is composed of a plate material,
A cutter device characterized in that a plurality of through holes are formed in the plate material along the moving direction of the blade. 2. The blade is a circular blade with a cutting edge formed along a circumference centered on the center line of the rotating shaft, and
The outer periphery of the circular blade is sandwiched between the two members from both sides, and the blade driving device rotates the circular blade sandwiched between the two members around the center line of the rotation axis while rotating the circular blade between the two members. The cutter device according to claim 1, which is a circular blade drive device for moving along a surface. 3. A large number of elongated holes are formed as the through holes in the plate material, and the two elongated holes that are adjacent to each other on the plate material are arranged in a direction perpendicular to the direction of movement of the blade. The cutter device according to claim 1 or 2, wherein the cutter device partially overlaps the cutter device.