JPH09117891A - Circle cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly cut a sheet by forcibly rotating a moving cutter by providing a moving cutter rotary pulley engaged with a timing belt and rotated by the rotational movement of the timing belt. SOLUTION: A holder 1 is moved via a fixed part 5 in a left direction according to the movement of a timing belt 3. On the other hand, since the lower part of the timing belt 3 is moved in a right direction, the belt is moved in the right direction at a speed twice as much as that for a moving cutter rotary pulley 4 and the moving cutter rotary pulley 4 engaged with the belt is turned in the left direction. At this time, a moving cutter 2 is rotated clockwise via transmission gears 7a and 7b. A sheet is positioned in the moving cutter 2 and a round cutter 9 and its full width is cut while the holder 1 is moved from right to left.

Description

Detailed Description of the Invention

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a circle cutter for cutting a long sheet such as roll paper of a facsimile, a printer or a plotter.

[0002]

2. Description of the Related Art A circular cutter, which cuts a sheet by moving a disk-shaped moving blade in the width direction of the sheet, has a wider sheet width than a cutter of a type that cuts by engaging two linear blades. However, it is not necessary to increase the size of the cutting tool in accordance with it, and the cutter device can be reduced in size and weight, so that it has been increasingly used in recent years.

In a conventional circle cutter, for example, as disclosed in JP-A-63-200987, a disk-shaped movable blade is rotatably mounted on a movable holder, and this movable blade is moved along a fixed blade. For cutting a sheet in cooperation with a fixed blade while moving the sheet.
As shown in Japanese Patent Publication No. 9, a disk-shaped movable blade is rotatably attached to a movable holder (usually a wire or screw is rotated and driven), and the movable blade is forced as the movable blade moves. In some cases, a rotating mechanism that rotates in a fixed manner is provided, and this moving blade moves along with the fixed blade while rotating and performs sheet cutting in cooperation with the fixed blade.

[0004]

In the former case, since the cutting is performed only by moving the disk-shaped movable blade, the smooth cutting cannot be performed. In the latter case, it is possible to cut smoothly by moving the disk-shaped moving blade while rotating, but it is possible to cut smoothly.However, in addition to the holder moving mechanism, a mechanism for rotating the moving blade such as a rack and pinion mechanism is required. Since it is separately required, the cost, size, and weight of the apparatus have been increased.

Although the movable blade is miniaturized by forming it into a disc shape, the fixed blade still needs a length commensurate with the sheet width, and thus there is a limit to the reduction in size and weight.

Further, as a moving mechanism of the holder 41 having the movable blade 40 axially attached, as shown in FIG.
It is most common to fix the holder 41 to the wire 42 laid across the wire 4 and drive the wire 42. However, in this mechanism, as shown in FIG. 6, the movable range of the holder is the holder 41 and the pulley. There was a dead space because 43 and 44 were not in contact with each other.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems and realizes sheet cutting by forcibly rotating a movable blade with a simple mechanism, and further size and weight reduction. This is done for the purpose of the circle cutter that moves the disk-shaped moving blade in the width direction of the sheet to cut the sheet, and the timing when it is rotatably moved across the frame and the pulleys axially attached to both ends of the frame. A holder having a belt and a belt fixing portion fixed to the timing belt, which moves along the frame in accordance with the rotational movement of the timing belt, and a movement that rotates by the rotational movement of the timing belt that is engaged with the timing belt and meshes with the timing belt. A blade cutter, and a circle cutter comprising a moving blade that is rotated by transmitting the rotation of the moving blade pulley, and Moving blade is pressed against thereto in cooperation with the round blade to move together a circle cutter, characterized in that the sheet is cut.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 are explanatory views of an embodiment of the present invention, each showing a different pattern. 1 to 3, the same reference numerals denote the same members, 1 is a holder, 2 is a movable blade, 3 is a timing belt, 4 is a movable blade rotary pulley, 5 is a fixed portion, 6 is a main pulley, 7 Is a transmission gear, 8 is an auxiliary pulley, 9 is a round blade, and 10 is a fixed blade. The frame is omitted in FIGS. Further, when the holder moves in the direction of arrow A, the other arrows indicate the rotation direction of the pulley or timing belt at that time.

First, the embodiment of FIG. 1 will be described.
The timing belt 3 is stretched over main pulleys 6a and 6b axially mounted on a frame (not shown). Teeth 3a are formed on the timing belt. The holder 1 can move left and right along a frame (not shown). The timing belt 3 is fixed to the holder 1 at a fixing portion 5. A movable blade 2, a movable blade rotary pulley 4, transmission gears 7a and 7b, auxiliary pulleys 8a and 8b, and a round blade 9 are mounted on the holder 1 as shafts. The movable blade rotary pulley 4 and the transmission gear 7a are coaxial with each other, and the movable blade 2 and the transmission gear 7b are fixed to each other. The movable blade rotary pulley 4 meshes with the timing belt 3, and when the timing belt moves relatively, the movable blade rotary pulley 4 rotates. The blade edge of the circular blade 9 is in pressure contact with the blade edge of the movable blade 2, and when the movable blade 2 rotates, the circular blade 9 also rotates accordingly. The transmission gears 7a and 7b are for transmitting the rotation of the movable blade rotating pulley 4 to the movable blade 2. Auxiliary pulley 8
Reference characters a and 8b are provided to make the orbit of the timing belt 3 predetermined and smoothly rotate.

When the main pulley 6a is rotated counterclockwise (in the direction of the arrow) by a drive mechanism (not shown), the timing belt 3 is rotated in the direction of the arrow, that is, the upper part is rotated leftward and the lower part is rotated rightward. Since the holder 1 is fixed to the timing belt 3 by the fixing portion 5, it moves in the direction of arrow A, that is, to the left according to the movement of the timing belt. On the other hand, since the lower portion of the timing belt 3 is moving to the right, it is moving to the right at a speed twice as fast as that of the moving blade rotary pulley 4, and the moving blade meshing with this is moving. The rotary pulley 4 rotates counterclockwise as indicated by the arrow. At this time, the transmission gear 7a also rotates. The rotation of the transmission gear 7a is transmitted to the transmission gear 7b, which rotates clockwise, and the movable blade 2 coaxially coupled thereto also rotates clockwise. The round blade 9 pressed against the moving blade 2 rotates counterclockwise. The sheet is at a position where the movable blade 2 and the round blade 9 contact each other, and the entire width of the sheet is cut while the holder 1 moves from right to left. When the holder reaches the left end, a limit device (not shown) operates to stop the rotation of the main pulley 6a, and the holder also stops. Next, the main pulley 6a is in the opposite direction,
That is, it starts rotating clockwise and the holder moves to the right end,
Stop by a limiter (not shown).

Since the movable blade is forcibly rotated by the movement of the movable blade when cutting the sheet, the sheet can be smoothly cut, and a special mechanism such as a rack and pinion for rotating the movable blade is not required, Since the timing belt for moving the moving blade serves as a drive source for forcibly rotating the moving blade, the number of parts is small with a simple structure, and the size, weight and cost are reduced.

Since the movable blade cooperates with the round blade to cut the sheet, it is not necessary to match the width of the sheet with the seam unlike the conventional fixed blade having a straight blade even if the width of the sheet becomes long, and the sheet becomes large and heavy. do not do. Since the round blade is pressed against the moving blade and cuts while rotating according to the rotation of the moving blade, the sheet is smoothly cut.

Next, the embodiment of FIG. 2 will be described.
This is different from the case of FIG. 1 above. Firstly, the holder 1
The position of the fixed part 5 is the lower part of the timing belt 3. As a result, the main pulley 6a is rotated clockwise to move the holder to the left. Secondly, the transmission gear is eliminated and the auxiliary pulley 8 is made one. Thirdly, instead of the round blade, a fixed blade 10 having a straight blade edge is provided. The movable blade 2 has its blade edge pressed against the fixed blade 10, and cooperates with this to cut the sheet.

The main pulley 6a is driven by a drive mechanism (not shown).
Is rotated clockwise (in the direction of the arrow), the timing belt 3 rotates in the direction of the arrow, that is, the upper part rotates in the right direction and the lower part rotates in the left direction. Since the holder 1 is fixed to the timing belt 3 by the fixing portion 5, it moves in the direction of arrow A, that is, to the left according to the movement of the timing belt. On the other hand, since the upper part of the timing belt 3 is moving to the right, it is moving to the right at a speed twice as fast as that of the moving blade rotating pulley 4. The rotary pulley 4 rotates clockwise as indicated by the arrow, and the movable blade 2 coaxially connected to the rotary pulley 4 also rotates clockwise. The sheet is just below the fixed blade 10 and is cut across its width while the holder 1 moves from right to left.
When the holder reaches the left end, a limit device (not shown) operates to stop the rotation of the main pulley 6a, and the holder also stops.
Next, the main pulley 6a starts rotating in the opposite direction, that is, in the counterclockwise direction, the holder moves to the right end, and is stopped by the limit device (not shown).

Next, the embodiment of FIG. 3 will be described.
The feature in this case is that the movable blade 2 and the movable blade rotary pulley 4 are provided outside the timing belt 3.
Therefore, the teeth 3a of the timing belt are provided outside, and theoretically, the driving range of the movable blade 2 and the movable blade rotary pulley 4 is from the center of the left main pulley 6b to the center of the main pulley 6a. It is possible to realize the downsizing of the device with respect to the required drive range as compared with the case of

The main pulley 6a is driven by a drive mechanism (not shown).
Is rotated clockwise (in the direction of the arrow), the timing belt 3 rotates in the direction of the arrow, that is, the upper part rotates in the right direction and the lower part rotates in the left direction. Since the holder 1 is fixed to the timing belt 3 by the fixing portion 5, it moves in the direction of arrow A, that is, to the left according to the movement of the timing belt. On the other hand, since the upper part of the timing belt 3 is moving to the right, it is moving to the right at a speed twice as fast as that of the moving blade rotating pulley 4. The rotary pulley 4 rotates counterclockwise as indicated by the arrow. At this time, the coaxial transmission gear 7a also rotates. The rotation of the transmission gear 7a is transmitted to the transmission gear 7b, which rotates clockwise, and the movable blade 2 coaxially coupled thereto also rotates clockwise. The round blade 9 pressed against the moving blade 2 rotates counterclockwise. The sheet is at a position where the movable blade 2 and the round blade 9 contact each other, and the entire width of the sheet is cut while the holder 1 moves from right to left. When the holder reaches the left end, a limit device (not shown) operates to stop the rotation of the main pulley 6a, and the holder also stops. Next, the main pulley 6a is in the opposite direction,
That is, the holder starts rotating counterclockwise and moves to the right end,
Stop by a limiter (not shown).

The number and arrangement of the transmission gears and the auxiliary pulleys in the present invention are not limited to those in the above embodiment. It is preferable that teeth are formed on the timing belt and each pulley because the operation is more reliable, but it also includes those without teeth. Of course, the timing belt may be a chain. As the material of each member, any material that is normally used including metal and plastic can be applied.

[0018]

4 and 5 relate to a circle cutter of an embodiment, FIG. 4 is a front view showing a central portion omitted, and FIG. 5 is a schematic view of a BB sectional view of FIG. This circle cutter is similar to the embodiment of FIG. 1 described above.

The circle cutter shown in FIGS. 4 and 5 includes a frame 20, a holder 21, a movable blade 22, and a timing belt 2.
3, moving blade rotary pulley 24, fixed portion 25, main pulley 26
a, 26b, transmission gears 27a, 27b, auxiliary pulley 2
8, round blade 29, guide piece 30, motor 33, limit 3
4a, 34b, etc.

The frame 20 has a guide portion 20a at the center thereof.
Is bent, and the cross section is substantially C as shown in FIG.
It is shaped. Main pulleys 26a and 26b are axially mounted near both ends, and a motor 33 is fixed to the right end. The rotation of the motor 33 is transmitted to the main pulley 26a via the worm gear 32 and the coaxial gear 31 to rotate. The timing belt 23 is attached to the main pulleys 26a and 26b.
Is spanned.

The holder 21 is attached to the frame 20 by a guide piece 30 and is slidable right and left by sliding along the guide portion 20a. Holder 2
A timing belt 23 is fixed to the first fixing unit 25. It is fixed by sandwiching the timing belt with screws and nuts. The holder 21 has a movable blade 2
2, moving blade rotary pulley 24, transmission gears 27a, 27b,
An auxiliary pulley 28 and a round blade 29 are mounted on the shaft. The movable blade rotary pulley 24 and the transmission gear 27a are coaxial with each other, and the movable blade 22 and the transmission gear 27b are fixed to each other. The movable blade rotary pulley 24 meshes with the timing belt 23, and when the timing belt relatively moves, the movable blade rotary pulley 24 rotates. Round blade 2
The blade edge of 9 is in pressure contact with the blade edge of the movable blade 22,
When the movable blade 22 rotates, the round blade 29 also rotates accordingly. The transmission gears 27 a and 27 b are for transmitting the rotation of the movable blade rotary pulley 24 to the movable blade 22. Auxiliary pulley 8
Is for making the orbit of the timing belt 23 a predetermined one and smoothly rotating it.

This circle cutter operates in the same manner as described in the embodiment of FIG. The sheet is at a position where the movable blade 22 and the round blade 29 come into contact with each other, and the entire width of the sheet is cut while the holder 21 moves from right to left. When the holder reaches the left end, the holder contacts the limit 34b, the limit device operates, the motor stops, and the holder also stops. Next, the motor starts rotating in the opposite direction, the holder moves to the right end, contacts the limit 34a, and stops.

[0023]

EFFECTS OF THE INVENTION Since the moving blade is forcibly rotated when the sheet is cut, the sheet can be cut smoothly.
No special mechanism such as a rack and pinion for rotating the moving blade is required, and the timing belt for moving the moving blade serves as a drive source for forcibly rotating the moving blade, so the number of parts is simple. Therefore, it is possible to reduce the size, weight and cost.

When the movable blade 2 and the movable blade rotary pulley 4 are provided outside the timing belt 3, they do not come into contact with the main pulley. Therefore, the movable blade rotary pulley and the movable blade are disposed on both sides of the timing belt. It can be moved from center to center, eliminates dead space, and is compact to the required cutting width.

When the movable blade cooperates with the round blade to perform sheet cutting, it is not necessary to match the seam and the width as in the conventional fixed blade even if the width of the sheet becomes long.
Does not increase in size and weight. Since the round blade is pressed against the moving blade and cuts while rotating according to the rotation of the moving blade, the sheet is smoothly cut.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is a front view showing the circle cutter of the embodiment with a central portion omitted.

5 is a schematic view of a cross section taken along the line BB in FIG.

FIG. 6 is an explanatory view of a conventional circle cutter.

[Explanation of symbols]

 1 Holder 2 Moving Blade 3 Timing Belt 4 Moving Blade Rotating Pulley 5 Fixed Part 6 Main Pulley 7 Transmission Gear 8 Auxiliary Pulley 9 Round Blade 10 Fixed Blade 20 Frame 20a Guide Part 21 Holder 22 Moving Blade 23 Timing Belt 24 Moving Blade Rotating Pulley 25 Fixed part 26a Main pulley 26b Main pulley 27a Transmission gear 27b Transmission gear 28 Auxiliary pulley 29 Round blade 30 Guide piece 31 Gear 32 Worm gear 33 Motor 34a Limit 34b Limit

Claims (4)

[Claims] 1. In a circle cutter for cutting a sheet by moving a disk-shaped moving blade in the width direction of the sheet, a frame and a timing belt which is rotatably moved by being spanned by pulleys axially mounted near both ends of the frame. , A holder that has a belt fixing part fixed to the timing belt and moves along the frame with the rotational movement of the timing belt, and a movable blade that rotates by the rotational movement of the timing belt that is engaged with the timing belt and meshes with the timing belt. A circle cutter including a pulley and a moving blade that is rotated by transmitting the rotation of the moving blade rotating pulley. 2. The circle cutter according to claim 1, wherein the movable blade cooperates with a circular blade that is pressed against the movable blade and moves together with the movable blade to cut the sheet. 3. A circle cutter characterized in that the movable blade cuts a sheet in cooperation with a fixed blade having a linear cutting edge fixed to a frame. 4. A circle cutter for moving a disk-shaped moving blade in the width direction of a sheet to cut the sheet, wherein the moving blade presses against the circular blade and cuts the sheet in cooperation with a circular blade that moves together. Characteristic circle cutter