JPH10202579A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cutting quality at the tip part of a cutting edge. SOLUTION: In this cutting device, a guide pin 23 of a movable cutting edge 11 is made to move by being guided by a guide part 14 of a fixed cutting edge 10 and a pin 20 is made to slide within an oblong hole 15 according to this moving when the movable cutting edge 11 rubbing against the fixed cutting edge 10 each other with a crossed angle is slidably and rotatably journalled to the oblong hole 15 of the fixed cutting edge 10 by this pin 20 and the movable cutting edge 11 is rotated with the pin 20 as a center. Therefore, when the movable cutting edge 11 is rotated, the location of the pin 20 to be the rotational supporting point of the movable cutting edge 11 is changed with process of rotation, the crossed angle of each cutting edge 10a, 11a at the tip part can be made larger than a conventional crossed angle and cutting quality at the tip part can be improved. Because the movable cutting edge 11 slides along the oblong hole 15 of the fixed cutting edge 10 at the time of a cutting, rotational amount of the movable cutting edge 11 can be reduced by sliding amount of the pin 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cutting device.

[0002]

2. Description of the Related Art Conventionally, as a cutting device used in a printing device such as a label printer, there is a scissor type as shown in FIGS. This type of cutting device includes a fixed blade 1
And a movable blade 2, and the fixed blade 1 is attached to an apparatus main body (not shown).
And the cutting edge 1a of the fixed blade 1 and the cutting edge 2 of the movable blade 2
In a state in which a is opposed to each other, a pin 5 which is a pivot point is inserted into a mounting hole 3 provided at a lower end of the fixed blade 1 and a mounting hole 4 provided at a lower end of the movable blade 2. The movable blade 2 is rotatably attached to the fixed blade 1 by the pin 5, and the movable blade 2 operates the operation lever 6 extending laterally from the lower end of the movable blade 2, whereby the movable blade 2 attaches the pin 5. Pivot to the center,
The cutting edge 2a of the movable blade 2 is configured to rub against the cutting edge 1a of the fixed blade 1 while intersecting with the cutting edge 1a to cut an object such as paper. Also, among the conventional cutting devices, a motor is used as a drive source for rotating the movable blade of the above-described cutting device, and the driving force of this motor is transmitted to the transmission gear to rotate the transmission gear, Further, there is a configuration in which the rotation of the transmission gear is transmitted to the movable blade to rotate the movable blade.

[0003]

However, in the cutting device shown in FIGS. 7 and 8, the movable blade 2 is
The pin 5 is rotatably fixed at one location, so as shown in FIG. 8A, the intersection angle θ between the cutting edges 1a and 2a when cutting at the root of the fixed blade 1 and the movable blade 2. _{On the} other hand, as shown in FIG. 8 (b), the intersection angle θ2 between the cutting edges 1a and 2a when cutting at the tips of the fixed blade 1 and the movable blade ₂ becomes considerably small, and as a result, the sharpness at the tips Gets worse. That is, the cutting edges 1a, 2a of the fixed blade 1 and the movable blade 2
As for the intersection angle of a, there is a problem that sharpness is better when the intersection angle is larger and sharpness becomes worse as the intersection angle becomes smaller. Further, in a cutting device in which a motor is used as a drive source for rotating the movable blade, and the driving force of the motor is transmitted to the movable blade via a transmission gear to rotate the movable blade, the cutting device includes a movable blade. If a foreign object that cannot be cut between the movable blade and the fixed blade is inserted during the rotation of the blade, the blades of the movable blade and the fixed blade, the transmission gear, etc. will be damaged, and the motor will be overloaded with unnecessary load. There are problems such as breakage.

An object of the present invention is to improve the sharpness at the tip of the blade. Another object of the present invention is to prevent breakage of the cutting device.

[0005]

According to the first aspect of the present invention,
A first cutting blade provided with a long hole in a direction intersecting the direction of the blade edge, and a blade edge of the first cutting blade slidably and rotatably supported by the long hole of the first cutting blade. And a second cutting blade having a cutting edge that rubs at an intersection angle. When both or one of the first and second cutting blades is rotated, the second cutting blade is longer than the first cutting blade. It is characterized in that it slides along the hole and the position of the rotation fulcrum changes as the rotation progresses. Therefore, according to the first aspect of the present invention, at the time of cutting, the second cutting blade slides along the long hole of the first cutting blade, and the position of the rotation fulcrum changes with the progress of rotation. (1) The intersection angle of each cutting edge at the tip of the second cutting blade can be made larger than that of the conventional one, so that the sharpness at the tip of the cutting edge can be improved, and the second cutting edge can be cut at the time of cutting. Since the cutting blade slides along the long hole of the first cutting blade, the amount of relative rotation of the first and second cutting blades can be reduced by the amount of the sliding.

According to a second aspect of the present invention, there is provided a driving means, a transmission member which is rotated by transmitting a driving force of the driving means, and idles when a load greater than a predetermined transmission torque is applied,
A relay member to which the rotation of the transmission member is transmitted, wherein both or one of the first and second cutting blades is rotated by the relay member. Therefore, according to the second aspect of the present invention, the driving force of the driving means is transmitted to the relay member via the transmission member, and the relay member rotates both or one of the first and second cutting blades. At that time,
When a foreign matter that cannot be cut is inserted between the first and second cutting blades, a load equal to or more than a predetermined transmission torque is applied to the transmission member, and the transmission member idles. It is possible to reliably prevent the cutting edge, the relay member, and the like from being damaged, and the driving means from being damaged by an excessive load applied to the driving means.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of a cutting apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view of the cutting device of the present invention. This cutting device includes a fixed blade (first cutting blade) 10 and a movable blade (second cutting blade).
Cutting blade) 11. The fixed blade 10 includes a substantially horizontal mounting portion 12, a blade body 13 formed substantially perpendicular to the mounting portion 12, and a guide portion 14 formed at one end of the mounting portion 12. Are attached to the apparatus main body or a chassis (neither is shown). In this case, a blade edge 10a is formed in a vertical direction on one side portion of the blade body portion 13 (the left side of the blade body portion 13 in the figure), and a portion of the attachment portion 12 located below the blade edge 10a. Has a long hole 15 formed in a direction perpendicular to the direction of the blade edge 10a. Also, the guide section 14
, A guide hole 16 described later is formed to be inclined obliquely upward.

The movable blade 11 includes a blade main body 17 having a blade 11a formed on one side (the right side of the blade main body 17 in the figure) facing the blade 10a of the fixed blade 10;
7 comprises an operation lever portion 18 extending from the lower end portion toward the guide portion 14 side of the fixed blade 10, and in a state where the blade edge 11a of the blade main body portion 17 and the blade edge 10a of the fixed blade 10 face each other. A pin 20 is inserted into a mounting hole 19 provided in a lower portion of the blade main body 17, and the pin 20 is inserted into the long hole 15 of the fixed blade 10.
Is slidably and rotatably attached to the fixed blade 10 by swaging. As shown in FIG. 2A, the movable blade 11 is caused by a spring force of a coil spring 22 attached to a lower end portion of the blade body 17 and an attachment rib 21 provided on the apparatus body or the chassis. The blade body 17 of the movable blade 11 is urged in a direction away from the blade body 13 of the fixed blade 10.

On the other hand, the fixed blade 10 is
A guide pin 23 movably inserted into a guide hole 16 formed in the guide portion 14 is provided. When the guide pin 23 is located at the upper left end of the guide hole 16, as shown in FIG.
When the pin 20 is located at the left end of the long hole 15 and moves diagonally downward along the guide hole 16, the pin 20 is moved rightward along the long hole 15, and the pin 20 is located at the lower right end of the guide hole 16. In addition, as shown in FIG. 2B, the pin 20 is configured to be located at the right end of the long hole 15 of the fixed blade 10. That is, the distance between the upper left end of the guide hole 16 of the guide portion 14 and the left end of the long hole 15 of the fixed blade 10 is the pin 20.
And the length of the guide pin 23 is equal to the length L and the guide hole 1
6 is formed in such a shape that the distance between the lower right end of the fixed blade 10 and the right end of the elongated hole 15 of the fixed blade 10 is equal to the length L of the pin 20 and the guide pin 23.

In such a cutting device, the blade body 17 of the movable blade 11 is normally urged away from the blade body 13 of the fixed blade 10 by the spring force of the coil spring 22. As shown in (a), the pin 20 is located at the left end of the elongated hole 15 of the fixed blade 10, the guide pin 23 of the operation lever 18 is located at the upper left of the guide hole 16 of the guide 14, and the movable blade 11 The cutting edge 11a of the fixed blade 10 is the cutting edge 1 of the fixed blade 10.
Most open to 0a. At this time, the cutting edge 10a of the fixed blade 10 and the cutting edge 11a of the movable blade 11 intersect at an intersection angle θa. When cutting an object such as paper in this state, the tip of the operation lever 18 is pressed down against the spring force of the coil spring 22. Then, the movable blade 11 rotates toward the fixed blade 10 about the pin 20, and the guide pin 23 of the operation lever portion 18 is connected to the guide hole 1 of the guide portion 14.
6, the pin 20 slides rightward in the elongated hole 15 against the spring force of the coil spring 22.

At this time, the movable blade 11 is rotated while the position of the pin 20, which is the fulcrum of rotation of the movable blade 11, is changed as the rotation progresses. Therefore, as shown in FIG. each cutting edge 10a at the tip of the fixed blade 10 and movable blade 11, the crossing angle θb of 11a can be made larger than the conventional crossing angle theta ₂ shown in FIG. 8 (b), so that each cutting edge 10a, 11a Can improve the sharpness at the tip. Also, at the time of such cutting, the movable blade 1
Since 1 slides along the long hole 15 of the fixed blade 10,
It is not necessary to rotate the movable blade 2 by the same rotation angle as the conventional one, and the amount of rotation of the movable blade 11 is reduced by the sliding of the pin 20, thereby reducing the operation stroke (rotation angle θc). This makes it possible to reduce the size of the entire apparatus.

In the first embodiment, the coil spring 22 is attached to the mounting rib 2 provided on the apparatus main body or the chassis.
1 and the lower end of the movable blade 11, but it is not necessarily provided on the mounting rib 21 provided on the apparatus main body or the chassis. For example, a mounting pin is provided on the mounting portion 12 of the fixed blade 10, and this mounting is performed. One end of the coil spring 22 may be attached to the pin. With this configuration, the fixed blade 10 can be attached to the apparatus main body or the chassis in a state where the movable blade 11 is attached to the fixed blade 10, and the assembling workability can be improved. In the first embodiment, the guide portion 14 for guiding the guide pin 23 is formed integrally with the attachment portion 12 of the fixed blade 10. However, the present invention is not limited to this. For example, the guide portion 14 is separately provided on the apparatus main body or the chassis. May be. Further, in the first embodiment, the fixed blade 10 is formed separately from the chassis and attached to the chassis. However, the present invention is not limited to this, and the fixed blade 10 may be formed integrally with the chassis.

[Second Embodiment] Next, a second embodiment of the cutting apparatus according to the present invention will be described with reference to FIGS. The same parts as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 3 and FIG.
0, a movable blade 11, a fixed plate 30 to which the fixed blade 10 is attached, and a driving device 31 provided on the fixed plate 30 to drive the movable blade 11. As in the first embodiment, the fixed blade 10 has a blade main body 13 provided vertically on the mounting portion 12 and a blade tip 10a on one side of the blade main body 13 (the right side of the blade main body 13 in FIG. 3). Is formed, and a long hole 15 is provided at a position of the mounting portion 12 located below the blade main body portion 13 in a direction orthogonal to the direction of the blade tip 10 a. One end of the mounting portion 12 is screwed to the fixing plate 30. 12a.

The movable blade 11 is substantially the same as the first embodiment.
A blade body 17 having a blade edge 11a formed on one side of the fixed blade 10 opposite to the blade edge 10a (the left side of the blade body 17 in FIG. 3). Operation lever portion 3 extending toward the opposite side to mounting portion 12
2, the cutting edge 11a of the blade body 17 and the fixed blade 10
The pin 20 is inserted into the mounting hole 19 provided in the lower part of the blade main body 17 in a state where the blade edge 10a faces the blade edge 10a, and the pin 20 is inserted into the long hole 15 of the fixed blade 10 and caulked. , Is slidably and rotatably attached to the fixed blade 10. In this case, an annular cam groove 33 is formed at one end of the operation lever 32, as shown in FIGS. 5A and 5B.

The fixing plate 30 has an elongated flat plate shape and is attached to an apparatus main body (not shown) such as a printing apparatus. The driving device 31 includes a motor (driving means) 34,
A torque limiter (transmission member) 35, an intermediate gear 36 and a cam gear 37 (both are relay members) are provided.
The motor 34 is provided on the back surface of the fixed plate 30, and its output shaft protrudes to the front side through the stupid hole 30 a of the fixed plate 30, and a small gear 38 is provided at the tip of the protruded output shaft. . The torque limiter 35 idles when a load equal to or more than a predetermined torque is applied. As shown in FIG. 4, a driving gear 39 that meshes with a small gear 38 of the motor 34 and rotates is supported by a support shaft of the fixed plate 30. 40a, and is rotatably mounted on the cylindrical shaft 39a of the drive gear 39.
A transmission gear 42 is rotatably mounted via a ring-shaped friction member 41 made of felt or the like, and a coil spring 43 is attached to the cylinder shaft 39a via the transmission gear 42, E-ring 44 at the tip
The transmission gear 42 is pressed against the drive gear 39 via the friction member 41 by the spring force of the coil spring 43, and when a load greater than the spring force of the coil spring 43 is applied to the transmission gear 42, the transmission gear 42 42 is configured to idle.

As shown in FIGS. 3 and 4, the intermediate gear 36 is composed of a large gear 36a that rotates while meshing with the transmission gear 42 of the torque limiter 35, and a small gear 36b that rotates integrally with the large gear 36a. , Support shaft 4 of fixing plate 30
0b so as to be freely rotatable. Cam gear 37
Is rotatably mounted on the support shaft 40c of the fixed plate 30 and rotatably engaged with the small gear 36b of the intermediate gear 36. The cam pin is located at an eccentric position on the surface of the movable blade 11 facing the operation lever portion 32. A cam pin 45 is provided so that the tip of the cam pin 45 is movably inserted into the cam groove 33 of the operation lever portion 32. In this case, the cam groove 33 of the operation lever portion 32 is moved along with the rotation of the cam gear 37 by the cam pin 45 so that the movable blade 11 is rotated around the pin 20 and the pin 20 is moved along the elongated hole 15. It is formed in a shape to be moved.

In such a cutting device, when the motor 34 of the driving device 31 rotates, the rotation is transmitted to the driving gear 39 of the torque limiter 35 via the small gear 38, and this rotation is transmitted to the transmission gear 42 and the intermediate gear 36. The cam pin 45 moves in the cam groove 33 of the operation lever portion 32 in accordance with the rotation of the cam gear 37, and as shown in FIGS. 6 (a) to 6 (d). As described above, the movable blade 11 is rotated while moving the pin 20 which is the rotation fulcrum of the movable blade 11, and the object to be cut can be cut.

That is, as shown in FIG. 6A, when the cam pin 45 is located at the upper middle of the cam groove 33,
A pin 20, which is a pivot point, is located at the right end of the long hole 15,
The cutting edge 11a of the movable blade 11 is the most open with respect to the cutting edge 10a of the fixed blade 10. At this time, the cutting edge 10a of the fixed blade 10 and the cutting edge 11a of the movable blade 11 intersect at an intersection angle θa. In this state, when the cam pin 45 moves to the left end of the cam groove 33 as shown in FIG.
When the movable blade 11 rotates about the
Slide toward the left end of the.

Therefore, similarly to the first embodiment, the movable blade 1
The movable blade 11 is rotated while the position of the pin 20, which is a rotation fulcrum, changes along with the cutting, and the intersection angle θb between the cutting edges 10a, 11a at the tip of the fixed blade 10 and the movable blade 11 is illustrated. 8 (b) can be made larger than the conventional intersection angle θ ₂ , so that the sharpness at the tips of the cutting edges 10a, 11a can be improved. Further, at the time of such cutting, the movable blade 11 slides along the long hole 15 of the fixed blade 10 as in the first embodiment, so that it is necessary to rotate the movable blade 2 by the same rotation angle as that of the conventional movable blade 2 as in the related art. Therefore, the amount of rotation of the movable blade 11 is reduced by an amount corresponding to the sliding of the pin 20, and the operation stroke (rotation angle θd) can be reduced.

Thereafter, as shown in FIG. 6 (c), when the cam pin 45 moves to the lower middle portion of the cam groove 33, the pin 20 which is a pivot point is located at the left end of the long hole 15.
The movable blade 11 further rotates about the pin 20 in the same direction. Then, as shown in FIG. 6D, when the cam pin 45 moves toward the right end of the cam groove 33, the pin 20 serving as the rotation fulcrum slides toward the right end of the elongated hole 15, and the pin 20 is moved. At the center, the blade body 17 of the movable blade 11 rotates in a direction away from the blade body 13 of the fixed blade 10, and returns to the initial state shown in FIG.

In this way, when a foreign object that cannot be cut is inserted between the blade body 13 of the fixed blade 10 and the blade body 17 of the movable blade 11 when cutting the object to be cut, Since a load greater than the spring force of the coil spring 43 is applied to the transmission gear 42 of the torque limiter 35, the transmission gear 4
2 spins. For this reason, even if foreign matter that cannot be cut is inserted between the blade main body portion 13 of the fixed blade 10 and the blade main body portion 17 of the movable blade 11, each of the cutting edges 1 of the fixed blade 10 and the movable blade 11 is removed.
0a, 11a, the gears 38, 36, 37, etc. may be damaged, or the motor 34
Can be reliably prevented from being damaged.

In the second embodiment, the rotation of the transmission gear 42 of the torque limiter 35 is transmitted to the cam gear 37 via the intermediate gear 36. However, the present invention is not limited to this. , The rotation of the transmission gear 42 may be directly transmitted to the cam gear 37. Further, in the second embodiment, the operation lever 32
The cam groove 33 is formed on the cam gear 37 and the cam pin 45 is provided on the cam gear 37. However, the invention is not limited thereto. The cam groove 33 may be formed on the cam gear 37 and the cam pin 45 may be provided on the operation lever 32. It is not necessary to provide the cam groove 33, and a plate-like or cylindrical cam may be used. Also,
In the first and second embodiments, the movable blade 11 is movable with respect to the fixed blade 10. However, the present invention is not limited to this, and both the two blades may be moved. Can also be applied.

[0023]

As described above, according to the first aspect of the present invention, the second cutting blade rubbing with the first cutting blade at an intersection angle can be slid into the elongated hole of the first cutting blade, and When the first and second cutting blades are pivotally supported and both or one of the first and second cutting blades is rotated, the second cutting blade slides along the long hole of the first cutting blade and rotates. Since the position of the fulcrum is changed as the rotation progresses, it is possible to make the crossing angle of each cutting edge at the tip of the first and second cutting blades larger than that of the conventional one, and to increase the tip of the cutting edge. And the second cutting blade slides along the long hole of the first cutting blade at the time of cutting, so that the relative movement of the first and second cutting blades by the sliding amount. A small amount of rotation can be reduced.

According to the second aspect of the present invention, the driving force of the driving means is transmitted via the transmitting member which rotates upon transmission of the driving force of the driving means and idles when a load exceeding a predetermined transmission torque is applied. Is transmitted to the relay member, and both or one of the first and second cutting blades is rotated by the relay member. Therefore, the driving force of the driving means is transmitted to the relay member via the transmission member. When both or one of the first and second cutting blades is rotated by the relay member, if a foreign matter that cannot be cut is inserted between the first and second cutting blades, the transmission member has a predetermined transmission torque or more. Is applied, and the transmission member idles, so that the respective cutting edges of the first and second cutting blades, the relay member, and the like are damaged, and an excessive load is applied to the driving means, and the driving means is damaged. Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a cutting device of the present invention.

2A and 2B show an operation state in a state where the cutting device of FIG. 1 is assembled, wherein FIG. 2A shows a state where a movable blade is opened most to a fixed blade, and FIG. The figure which showed the state which rubbed the cutting edge of the blade and performed cutting.

FIG. 3 is a perspective view showing a second embodiment of the cutting device of the present invention.

FIG. 4 is an exploded perspective view of the cutting device of FIG. 3;

FIG. 5 shows the movable blade of FIG. 4, (a) is a front view thereof,
(B) is an AA sectional view of (a).

6 schematically shows the operating state of the cutting device of FIG. 3,
(A) is a diagram showing an initial state before starting cutting,
(B) is a diagram showing a state during cutting, (c) is a diagram showing a state where cutting is completed, and (d) is a diagram showing a state where cutting is completed and returns to an initial state.

FIG. 7 is an exploded perspective view of a conventional cutting device.

8A and 8B show an operation state in a state where the cutting device of FIG. 7 is assembled, wherein FIG. 8A shows a state in which a movable blade is most opened with respect to a fixed blade, and FIG. The figure which showed the state which rubbed the cutting edge of the blade and performed cutting.

[Explanation of symbols]

 Reference Signs List 10 fixed blade 10a fixed blade edge 11 movable blade 11a movable blade edge 14 guide portion 15 long hole 20 pin 22 coil spring 23 guide pin 31 drive device 33 cam groove 34 motor 35 torque limiter 36 intermediate gear 37 cam gear 46 cam pin

Claims (2)

[Claims] A first cutting blade provided with a long hole in a direction intersecting a direction of a blade edge; a first cutting blade slidably and rotatably supported by said long hole in said first cutting blade; A second cutting blade having a cutting edge that rubs at an intersection angle with the cutting edge of the first cutting blade, wherein the second cutting is performed when both or one of the first and second cutting blades is rotated. A cutting device, wherein a blade slides along the elongated hole of the first cutting blade, and a position of a rotation fulcrum changes as the rotation progresses. 2. A driving member, a transmission member which is rotated by transmitting a driving force of the driving unit, and idles when a load equal to or more than a predetermined transmission torque is applied, and a relay member to which rotation of the transmission member is transmitted. The cutting device according to claim 1, further comprising: rotating both or one of the first and second cutting blades by the relay member.