JPH1029193A - Circle cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically return a moving cutter holder to its standby position when a load is applied thereto by paper jamming or the like by moving the moving cutter holder associatively with a timing belt in its lower (upper) side. SOLUTION: After a switch is turned ON in an initial state, a pulley 1 and a timing belt 3 are rotated left, a cut gear 5 is associatively rotated so as to fix a cut gear portion 5a facing down, and then a moving cutter holder 4 is moved left. After coming into contact with a stopper 8 in a left side, the moving cutter holder 4 is prevented from making further left movement and thus stopped. However, since the timing belt 3 still continues its rotational motion, the moving cutter holder 4 is moved right associatively with the timing belt in the lower side. In other words, the moving cutter holder 4 is caused to make automatic reciprocating motion. Thus, even if the moving cutter holder 4 is stopped by paper jamming or the like, the moving cutter holder 4 is automatically returned to its standby position and stopped.

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.

As shown in Japanese Patent Application Laid-Open No. 63-200987, for example, a conventional circle cutter has a disk-shaped moving blade mounted on a movable holder (usually driven by rotating a wire, timing belt, screw, etc.). Is rotatably mounted on the shaft, and the movable blade is moved along the fixed blade to cut the sheet in cooperation with the fixed blade, and the movable blade is movable as shown in, for example, JP-A-2-143879. A disk-shaped movable blade is rotatably mounted on a holder, and a rotating mechanism is forcibly rotated as the movable blade moves, and the movable blade moves while rotating along the fixed blade, There is one that performs sheet cutting in cooperation with a fixed blade.

The holder is driven by rotating a wire timing belt or a screw. After the holder is moved in a predetermined direction to cut the sheet, it must be moved in the opposite direction to return to the standby position. No. In order to reciprocate the holder in this manner, for example, the motor is rotated forward or backward, or a reverse gear is provided in the drive system.

[0005]

In any case, in order for the holder to reciprocate, a special electric circuit or a gear for reverse rotation is required, and furthermore, a detection gear is required for each of normal rotation and reverse rotation. Switches were required, which led to higher costs and larger equipment. In addition, if the paper cannot be cut due to paper jam or the like, it must be confirmed with a sensor or the like, and the motor must be returned to the origin by reverse rotation or main driving.
The present invention enables a reciprocating motion of the holder with a very simple mechanism, realizes cost reduction and size reduction of the apparatus, and automatically returns to the standby position when a load is applied to the movable blade holder due to paper jam or the like. It is like that.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a circle cutter for cutting a sheet by moving a disk-shaped moving blade in the width direction of the sheet, comprising two rotatably mounted shafts near both ends of a main body. A pulley, a timing belt that is bridged over the pulley, has a tooth profile formed inside, and rotates and moves with the rotation of the pulley, a movable blade holder that is slidably mounted on the main body and slides along the timing belt, A toothless gear that is axially mounted on the holder and located in the middle of the upper and lower timing belts, and is fixed at a position where the toothless part is directed upward and downward, but is released when a rotational force of a predetermined value or more acts. When the missing tooth part is upward, it meshes with the teeth of the lower timing belt, and when the missing tooth part is downward, it meshes with the teeth of the upper timing belt. It has a missing tooth gear that meshes with the stopper and a stopper that restricts the movement of the movable blade holder near both ends of the main body. When the movable blade holder has the missing tooth part facing downward (upward), the upper (lower) timing When the movable blade holder comes into contact with the stopper to restrict the movement by engaging with the belt belt teeth and moving with the upper (lower) timing belt, a rotational force of a predetermined value or more acts on the missing tooth gear and the fixed tooth gear is released. And the missing tooth part is fixed again with the upward (downward) direction,
At the same time, this is a circle cutter in which the movable blade holder reciprocates by engaging with the teeth of the lower (upper) timing belt and moving the movable blade holder together with the lower (upper) timing belt. .

[0007] As a specific mechanism for controlling the rotation of the toothless gear, a coaxial control shaft is fixed to the toothless gear, and this control shaft has two notch portions cut in an arcuate shape. Is held by two leaf springs fixed to the movable blade holder, and when the leaf spring is in contact with the two notches, the missing tooth gear is fixed by the force urged by the leaf spring. When a rotational force exceeding a predetermined value acts, the leaf spring is deformed, the fixed state is released, and the toothless gear rotates.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 to 4 are explanatory views for explaining the reciprocating motion of the movable blade holder in the present invention. FIG.
6 is a front view of the circle cutter according to the embodiment.

1 to 4, reference numerals 1 and 2 denote pulleys, 3 denotes a timing belt, 3a denotes a tooth shape, 4 denotes a movable blade holder, 5 denotes a chipped gear, 6 denotes a control shaft, 6a denotes a notch,
7 is a leaf spring, and 8 and 9 are stoppers. Pulley 1, 2
Is rotatably mounted on a body frame (not shown), and a pulley 1 is a drive pulley that is driven to rotate only in one direction (counterclockwise in the figure) by a motor (not shown).
A timing belt 3 is stretched over the pulleys 1 and 2. A tooth profile 3a is formed inside the timing belt 3 over its entire length, but the illustration is omitted and only a part of the tooth profile is shown. The movable blade holder 4 is slidably mounted on a main body frame (not shown), and slides right and left along the timing belt 3. A toothless gear 5 is axially mounted on the movable blade holder 4. The toothless tooth gear 5 is located in the middle of the upper and lower timing belts, and is fixed at a position where the toothless part 5a is directed upward and downward, but is unlocked and rotated when a rotational force of a predetermined value or more acts. It has become. That is, the control shaft 6 is coaxially fixed to the toothless gear 5, and the control shaft 6
It has a notch 6a in which a bow is cut out at two places, and is held by two leaf springs 7 (two tip ends of a U-shaped leaf spring) fixed to the movable blade holder 4, and this leaf spring is Is in contact with the two notches 6a, the missing tooth gear is in a fixed state by the force urged by the leaf spring, and when a predetermined or more rotational force is applied, the leaf spring is deformed and the fixed state is released. The toothless gear rotates.

The teeth of the toothless gear 5 mesh with the teeth of the upper timing belt when the toothless portion 5a faces downward as shown in FIG. 1, and when the toothless tooth portion 5a faces upward as shown in FIG. It meshes with the teeth of the lower timing belt.
When the teeth of the toothless tooth gear 5 mesh with the teeth of the upper timing belt as shown in FIG. 1, the movable blade holder 4 slides with the rotational movement of the upper timing belt, and as shown in FIG. When the lower timing belt meshes with the teeth of the lower timing belt, the movable blade holder 4 slides with the rotation of the lower timing belt.

FIG. 1 shows a state in which the missing tooth portion 5a of the missing tooth gear 5 is fixed downward and the missing tooth gear 5 meshes with the tooth profile of the upper timing belt. Therefore, if the pulley 1 rotates left in this state, the upper timing belt moves to the left, and the movable blade holder 4 moves to the left accordingly.

As shown in FIG. 2, when the movable blade holder 4 comes into contact with the left stopper 8, the movable blade holder 4 cannot move further to the left and stops moving. However, since the timing belt 3 still continues to rotate, a large rotational force to rotate to the left is applied to the toothless gear 5 meshing therewith. This rotational force overcomes the elastic force of the leaf spring 7 and deforms the leaf spring 7, and at the same time, the chipped gear is released from the fixed state and rotates. When rotated by 180 degrees, the leaf spring 7 comes into contact with the notch 6a of the control shaft 6, and is again fixed. Then, as shown in FIG. 3, the missing tooth portion 5a of the missing tooth gear 5 is fixed upward and the missing tooth gear 5 meshes with the tooth profile of the lower timing belt.
Therefore, as the pulley 1 continues to rotate counterclockwise, the movable blade holder 4 moves rightward with the lower timing belt (FIG. 3).

Eventually, the movable blade holder 4 comes into contact with the right stopper 9 and the limit switch 10 as shown in FIG. The drive motor is stopped by the limit switch 10, and the rotation of the pulley 1 and the timing belt 3 is stopped. That is, FIG. 4 shows the standby position (initial state). When the switch is turned on in this state, pulley 1
Then, the timing belt 3 rotates counterclockwise, the chipped tooth gear 5 rotates, the chipped tooth portion 5a faces downward and is fixed, and the movable blade holder 4 moves to the left (FIG. 1). Eventually, the state of FIG. 2 is reached and the movement is stopped. Then, the state of FIG. 3 is reached and moved to the right, and finally the state of FIG. 4 is stopped. That is, the movable blade holder automatically reciprocates. Even when the movable blade holder stops due to paper jam or the like, the movable blade holder automatically returns to the standby position and stops according to the same principle.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A circle cutter 11 shown in FIG.
It comprises pulleys 13, 14, a timing belt 15, a movable blade holder 16, a movable blade 17, a round blade 18, and the like. The moving blade holder 16 is equipped with a partially toothed gear, a control shaft, and a leaf spring, and reciprocates automatically according to the same principle as in FIGS. 1 to 4 described above. The moving blade holder 16 has a moving blade 17
And a cooperating round blade 18 are mounted between the moving blade 17 and the round blade 18 while the moving blade holder 16 (the moving blade 17 and the round blade 18) moves from left to right. Sheet S
Is cut over the entire width, and then the movable blade holder 16 automatically moves to the right end and stops.

The circle cutter 21 shown in FIG.
2, the pulleys 23 and 24, the timing belt 25, the movable blade holder 26, the movable blade 27, the fixed blade 28, and the like. The moving blade holder 26 is equipped with a partially toothed gear, a control shaft, and a leaf spring in the same manner as in FIGS. 1 to 4 described above, and reciprocates automatically according to the same principle. The movable blade 27 is mounted on the movable blade holder 26. An opening 29 is formed in the main body 22, and a fixed blade 28 is mounted on the opening 29. The sheet S is disposed in the lower opening 29 of the fixed blade 28, and the sheet located between the movable blade 27 and the fixed blade 28 while the movable blade holder 26 (the movable blade 27) moves from left to right. S is cut over the entire width, and then the movable blade holder 2
6 automatically moves to the right end and stops.

[0016]

According to the present invention, the holder can be reciprocated by a very simple mechanism, thereby realizing cost reduction and downsizing of the apparatus. Further, in the conventional circle cutter, when the movable blade holder is stopped due to a trouble such as a paper jam, the movable blade holder is returned to the standby position by, for example, reversing a driving source such as a motor or reversing manually. However, the circle cutter according to the present invention also has the effect of automatically reversing when the movable blade holder is locked (stopped) and returning smoothly and reliably to the standby position.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a reciprocating motion of a movable blade holder according to the present invention.

FIG. 2 is an explanatory diagram for explaining a reciprocating motion of a movable blade holder according to the present invention.

FIG. 3 is an explanatory diagram for explaining a reciprocating motion of a movable blade holder according to the present invention.

FIG. 4 is an explanatory diagram for explaining a reciprocating motion of a movable blade holder according to the present invention.

FIG. 5 is a front view of the circle cutter 11 of the embodiment.

FIG. 6 is a front view of the circle cutter 21 of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulley 2 Pulley 3 Timing belt 3a Tooth shape 4 Moving blade holder 5 Missing tooth gear 5a Missing tooth portion 6 Control shaft 6a Notch 7 Leaf spring 8 Stopper 9 Stopper 11 Circle cutter 12 Main body 13 Pulley 14 Pulley 15 Timing belt 16 Moving blade holder 17 Moving blade 18 Round blade 21 Circle cutter 22 Main body 23 Pulley 24 Pulley 25 Timing belt 26 Moving blade holder 27 Moving blade 28 Fixed blade 29 Opening S sheet

Claims (2)

[Claims] 1. A circular cutter for cutting a sheet by moving a disk-shaped moving blade in the width direction of the sheet, comprising: two pulleys rotatably mounted near both ends of a main body;
A timing belt that is wrapped around the pulley and has a tooth profile formed inside and that rotates and rotates with the rotation of the pulley; a movable blade holder that is slidably mounted on the main body and slides along the timing belt; A toothless gear that is axially attached and located in the middle of the upper and lower timing belts, and is fixed at the position where the toothless part is directed upward and downward. When the missing tooth part is upward, it meshes with the teeth of the lower timing belt, and when the missing tooth part is downward, it meshes with the teeth of the upper timing belt, and near both ends of the main body. And a stopper for restricting the movement of the movable blade holder, wherein the movable blade holder engages with the teeth of the upper (lower) timing belt when the missing tooth portion is directed downward (upward). When the movable blade holder comes into contact with the stopper and the movement is restricted, a rotational force of a predetermined value or more acts on the missing tooth gear, and the movable tooth holder is unlocked and rotated. The tooth portion is again fixed in the upward (down) direction, and at the same time, meshes with the teeth of the lower (upper) timing belt, and the movable blade holder moves together with the lower (upper) timing belt, so that the movable blade holder is moved. Reciprocating with a circle cutter 2. The circle cutter according to claim 1, wherein
A coaxial control shaft is fixed to the notched gear, and this control shaft has a notch portion cut in an arcuate shape at two opposing locations, and is held by two leaf springs fixed to the movable blade holder. When the leaf spring is in contact with the two notches, the toothless gear is in a fixed state due to the force urged by the leaf spring, and when a rotational force exceeding a predetermined level acts, the leaf spring is deformed and fixed. Is released and the missing toothed gear rotates.