JP2021020310A - Cutting device and printer - Google Patents

Abstract

To provide a cutting device capable of well cutting even thin and soft objects that are easy to generate cutting defects, and to provide a printer equipped with the cutting device.SOLUTION: A cutting device 100 is equipped with a first frame 81, a fixed blade 101, a moving blade 105, and a pressing member 50. To the first frame 81, a fixed blade 101 is fixed, and the moving blade 105 is supported so as to vertically move. At a lower end of the fixed blade 101, a first blade 101A is formed. At an upper end of the moving blade 105, a V-shaped second blade portion 102 is formed, and at a lower end, a contacting portion 109 contacted with the first frame 81 is formed. The moving blade 105 is pressed forward by the pressing member 50. Assuming a triangle having a first point P and a second point Q at which the second blade portion 102 is brought into contact with the first blade portion 101A, and a third point R at which the contacting portion 109 is brought into contact with the first frame 81, as a virtual triangle T, a pressing position S at which the pressing member 50 presses the moving blade 105 is included in the virtual triangle T.SELECTED DRAWING: Figure 8

Description

The present invention relates to a cutting device and a printing device.

The tape printing apparatus disclosed in Patent Document 1 includes a cutter unit for cutting a roll sheet. The cutter unit includes a rear frame, a movable blade, a fixed blade, and a pressing spring. The rear frame supports the movable blade so that it can move up and down. A V-shaped cutting edge is formed at the upper end of the movable blade. As the movable blade moves upward, the blade edge of the movable blade sandwiches the roll sheet in cooperation with the linearly extending blade edge formed at the lower end of the fixed blade. The movable blade has a guide portion extending downward. The pressing spring presses the movable blade in the rear direction from the movable blade toward the rear frame and the fixed blade. The movable blade has a fixed blade and a rear guide, with two points where the cutting edge of the movable blade contacts the cutting edge of the fixed blade and two points where the left and right ends of the lower end of the guide part each contact the rear frame. Push.

Japanese Unexamined Patent Publication No. 2008-68565

However, depending on the component accuracy or assembly accuracy of each member constituting the cutter unit, the pressing force of the pressing spring acting on the two points of the fixed blade edge and the movable blade edge may become imbalanced.
In this case, especially when the roll sheet is thin and soft, there is a risk that cutting defects may occur in the cutter unit.

An object of the present invention is to provide a cutting device capable of satisfactorily cutting even a thin and soft object to be cut in which cutting defects are likely to occur, and a printing device provided with the cutting device.

The cutting device according to the first aspect of the present invention has a first frame, a first blade portion extending linearly, a substantially flat plate-shaped fixed blade fixed to the first frame, and a substantially flat fixed blade provided so as to be movable. A flat plate-shaped movable blade, which is formed in a V shape at one end in the moving direction, and has a second blade for cutting an object to be cut in cooperation with the first blade. A movable blade formed at the other end in the moving direction and having a contact portion in contact with the first frame, a movable blade driving mechanism for moving the movable blade, and a fixed blade and the first frame from the movable blade. It is provided with a pressing member that presses the movable blade in the first direction toward, and the pressing position at which the pressing member presses the movable blade is the first point and the first point where the second blade portion contacts the first blade portion. It is characterized in that it is included in a virtual triangle having two points and a third point in which the contact portion contacts the first frame as vertices.

According to the above configuration, since the pressing position is included in the virtual triangle, the pressing force of the pressing member always acts on the first to third points. That is, due to the pressing force of the pressing member, the second blade portion of the movable blade is always and surely pressed against the first blade portion of the fixed blade. Since the first point and the second point are the cutting points of the object to be cut, the cutting device can satisfactorily cut even a thin and soft object to be cut in which cutting defects are likely to occur.

In the present invention, even if the first point and the second point move with the movement of the movable blade, the pressing position may always be included in the virtual triangle. In this case, even if the movable blade moves, the pressing position is always included in the virtual triangle, so that the second blade portion is always reliably pressed against the first blade portion. Therefore, the movable blade can satisfactorily cut the object to be cut in cooperation with the fixed blade.

In the present invention, the length of the first side of the virtual triangle connecting the first point and the third point and the length of the second side of the virtual triangle connecting the second point and the third point may be different from each other. .. Even if the third point where the contact portion contacts the first frame is provided at a position where the first side and the second side of the virtual triangle are unequal side triangles having different lengths, the pressing force of the pressing member is applied from the first point to the first point. It can surely act on the third point.

In the present invention, the other end of the movable blade has a first piece and a second piece arranged side by side at one end and the other end in the direction in which the first blade extends. One piece includes a contact part, and the second piece does not have to contact the first frame. Since the second piece does not come into contact with the first frame, the point where the contact part of the first piece comes into contact with the first frame can be set as the third point.

In the present invention, the pressing member includes a pressing contact portion that contacts the movable blade at the pressing position, and the pressing contact portion may be curved. Since the pressing contact portion is curved, the area where the pressing contact portion contacts the movable blade can be reduced. As a result, the frictional resistance generated by the contact between the pressing member and the movable blade is reduced. Therefore, the movable blade can move smoothly.

In the present invention, the pressing member may be a leaf spring. Since the pressing member is a leaf spring, the cutting device can be easily configured.

In the present invention, the movable blade drive mechanism rotates with an engaging groove formed on the movable blade and extending in parallel with the first blade portion, and a rotating body rotatably supported by a second frame different from the first frame. A pin provided at a position eccentric from the center of rotation of the body, engaged with an engaging groove, and inserted into a through hole formed in the first frame, and a motor for rotating the rotating body are provided, and by rotation of the motor. When the rotating body rotates, the movable blade may move by sliding the pin with respect to the engaging groove. A pin provided on the rotating body directly engages with the engaging groove of the movable blade. The cutting device can simplify the movable blade drive mechanism as compared with the case where the pin is indirectly connected to the movable blade via another member.

The printing device of the second aspect of the present invention cuts the above-mentioned cutting device, a printing means that executes printing on a printing medium that is a cutting object to be cut by the cutting device, and a printing medium printed by the printing means. It is characterized by including a transport means for transporting toward the device. The printing device has the same effect as the cutting device.

It is a perspective view of the printing apparatus 1. It is a right side view which shows the internal structure of a printing apparatus 1. It is a front view of the cutting device 100. It is a front view of the cutting device 100 which omitted the movable blade drive mechanism 130. It is a perspective view of the 1st frame 81, the fixed blade 101, and the movable blade 105. It is a rear view of the cutting device 100. FIG. 4 is a cross-sectional view of a fixed blade 101, a movable blade 105, and a first frame 81 in the direction of arrow I-I in FIG. It is an enlarged front view of the cutting device 100. It is a schematic diagram of the fixed blade 101 and the movable blade 105 in a plan view. It is a schematic diagram of the fixed blade 101 and the movable blade 105 in the right side view. It is an XY graph for examining the 1st specific condition. It is an XY graph for examining the 2nd specific condition. It is explanatory drawing which shows the change of the positional relationship between the pressing position S and the virtual triangle T when the first specific condition is not satisfied. It is a graph of F _1L and F _2R when the first specific condition is not satisfied. It is another explanatory view which shows the change of the positional relationship between the pressing position S and the virtual triangle T when the first specific condition is not satisfied. It is another graph of F _1L and F _2R when the first specific condition is not satisfied. It is explanatory drawing which shows the change of the positional relationship between a pressing position S and a virtual triangle T when a specific condition is satisfied. It is a graph of F _1L and F _2R when a specific condition is satisfied.

The printing apparatus 1 which is an example of the embodiment of the present invention will be described with reference to the drawings. The printing apparatus 1 of the present embodiment is equipped with a roll 8 around which the printing medium 7 is wound. The print medium 7 is in the form of a thin and soft sheet, and is, for example, a tape having a thickness of 0.1 mm or less. In the present embodiment, printing is performed on the print medium 7 unwound from the roll 8, and then the print medium 7 is cut as an object to be cut. Hereinafter, the left / right, front / back, and top / bottom indicated by arrows in the drawing will be described as left / right, front / back, and top / bottom of the printing apparatus 1.

The configuration of the printing apparatus 1 will be described with reference to FIGS. 1 and 2. The printing device 1 includes a box-shaped main body case 12. The rear portion of the main body case 12 is provided with an accommodating portion 6 which is a recess recessed downward. The accommodating portion 6 includes an opening 6A in which the roll 8 is accommodated. The accommodating portion 6 is provided with a mounting portion 20.

The roll 8 is formed by winding a printing medium 7 around a cylindrical core portion 4. A right holder portion 9 and a left holder portion 10 are attached to the winding core portion 4. The right holder portion 9 and the left holder portion 10 rotatably support the winding core portion 4. The roll 8 is housed in the accommodating portion 6 with the right holder portion 9 and the left holder portion 10 attached to the winding core portion 4, and in this state, the winding core portion 4 rotates together with the print medium 7.

A cover 3 that opens and closes the opening 6A is rotatably supported at the rear end of the main body case 12.
A platen roller 26 extending in the left-right direction is rotatably supported at the tip of the cover 3.
A roller gear 25 is fixed to the right end of the shaft portion 26A of the platen roller 26.

A printing means 21 is provided at the center of the main body case 12 in the front-rear direction. The printing means 21 includes a head support portion 28 and a printing head 29. The head support portion 28 is provided so as to be movable up and down, and is urged upward by a spring 24. The print head 29 is provided on the upper surface of the head support portion 28. The print head 29 of this example is a thermal head and includes a plurality of heating elements (not shown). When the cover 3 is in a position to close the accommodating portion 6, the platen roller 26 presses the print head 29 downward against the urging force of the spring 24. At this time, the roller gear 25 meshes with the gear train (not shown) inside the main body case 12 and is connected to the transport motor (not shown) inside the main body case 12. Hereinafter, the platen roller 26, the roller gear 25, the gear train, and the transfer motor are collectively referred to as the transfer means 27.

A guide plate 23 (see FIG. 2) is provided on the front side of the head support portion 28. The guide plate 23 is a horizontal plate member extending in the left-right direction, and can guide the print medium 7 to the front side. A cutting device 100, which will be described later, is provided on the front side of the guide plate 23. A front cover 30 that covers the front and the top of the cutting device 100 is attached to the main body case 12. The front cover 30 includes an discharge port 32 for discharging the print medium 7. The discharge port 32 is a rectangular hole extending in the left-right direction. An operation unit 39 is provided on the right side of the front cover 30. The user inputs various instructions to the operation unit 39.

The cutting device 100 will be described with reference to FIGS. 2 to 7. The cutting device 100 is a device that cuts the print medium 7 guided by the guide plate 23 as a cutting object.

As shown in FIGS. 2 and 3, the cutting device 100 includes a first frame 81, a fixed blade 101, a movable blade 105, and a movable blade driving mechanism 130.

The first frame 81 shown in FIGS. 5 and 6 is a sheet metal fixed at the lower part of the main body case 12, and includes a rectangular plate 81A and a pair of auxiliary guide plates 81B. The rectangular plate 81A extends in the left-right direction. The pair of auxiliary guide plates 81B extend forward from the left and right ends of the rectangular plate 81A, respectively. A passage hole 92 through which the print medium 7 can pass is formed in a substantially central portion above and below the rectangular plate 81A. The passage hole 92 is a rectangular hole extending in the left-right direction. The front end portion of the guide plate 23 described above has entered the passage hole 92 (see FIG. 2). A through hole 93 is provided in the lower portion of the rectangular plate 81A. The through hole 93 includes a circular hole 93A and a rectangular hole 93B extending in the vertical direction on the right side of the circular hole 93A. An auxiliary plate 96 is fixed to the front surface of the lower portion of the rectangular plate 81A. The auxiliary plate 96 has a substantially U-shape when viewed from the front, and includes a guide portion 96A and an auxiliary guide portion 96B in order from the left side. The guide portion 96A and the auxiliary guide portion 96B are located outside the through hole 93 in the left-right direction in the front view.

As shown in FIGS. 3 and 4, the fixing blade 101 is formed in a flat plate shape having a thickness in the front-rear direction, and is fixed to the front surface of the rectangular plate 81A by two screws 71. At the lower end of the fixed blade 101, a first blade portion 101A extending linearly in the left-right direction is formed.

As shown in FIG. 5, the movable blade 105 has a substantially flat plate shape having a thickness in the front-rear direction, and is supported by the first frame 81 so as to be movable in the up-down direction. The movable blade 105 is arranged on the front side with respect to the fixed blade 101 and the rectangular plate 81A of the first frame 81. Therefore, the direction from the movable blade 105 toward the fixed blade 101 and the rectangular plate 81A is the rear direction. The movable blade 105 is supported in contact with the first frame 81 and the fixed blade 101, and is inclined from the lower rear to the upper front in the side view (see FIG. 7).

The upper portion 103 of the movable blade 105 is a portion that comes into contact with the fixed blade 101 from the front, and includes a second blade portion 102 and a pair of extending portions 104. The second blade portion 102 is provided for cutting the print medium 7 in cooperation with the first blade portion 101A, and is formed in a V shape in front view. The pair of extending portions 103B extend upward from the left and right ends of the second blade portion 102, respectively. The pair of extending portions 103B are inside the pair of auxiliary guide plates 81B of the first frame 81 in the left-right direction, whereby the movement of the movable blade 105 in the left-right direction is restricted.

The second blade portion 102 includes a first inclined blade portion 102A and a second inclined blade portion 102B that are symmetrical to each other. The first inclined blade portion 102A and the second inclined blade portion 102B are inclined downward toward the movable blade center C, which is the center of the second blade portion 102 in the left-right direction. Further, the second blade portion 102 is formed so as to warp toward the rear toward the center C of the movable blade (not shown). As a result, the first inclined blade portion 102A comes into contact with the first blade portion 101A of the fixed blade 101 at one point, and the second inclined blade portion 102B is 1 with respect to the first blade portion 101A of the fixed blade 101. Contact at a point. Hereinafter, the contact point between the first inclined blade portion 102A and the first blade portion 101A is referred to as a first point P, and the contact point between the second inclined blade portion 102B and the first blade portion 101A is referred to as a second point Q (see FIG. 8). ). Both the first point P and the second point Q are cutting points at which the print medium 7 is cut. When the movable blade 105 moves upward, both the first point P and the second point Q move in the direction approaching the center C of the movable blade.

The lower portion 106 of the movable blade 105 has a rectangular shape when viewed from the front, and extends downward from the upper portion 103.
The center of the lower portion 106 in the left-right direction is shifted to the right with respect to the center of the movable blade C. The lower portion 106 includes a first piece 106A and a second piece 106B. The first piece 106A and the second piece 106B are arranged side by side at the left end and the right end of the lower end of the lower portion 106, and both have a substantially rectangular shape when viewed from the front. The first piece portion 106A is in contact with the guide part 96A, whereby the movable blade 105 is positioned in the left-right direction. The second piece 106B faces the auxiliary guide 96B, which limits the lateral movement of the movable blade 105.

Since the movable blade 105 is inclined from the rear lower side to the front upper side in the side view as described above, the lower end of the first piece portion 106A comes into contact with the front surface of the rectangular plate 81A of the first frame 81. On the other hand, the second piece portion 106B is located in front of the through hole 93 and does not come into contact with the rectangular plate 81A of the first frame 81. Hereinafter, the lower end of the first piece portion 106A is referred to as a contact portion 109, and the contact point between the contact portion 109 and the first frame 81 is referred to as a third point R (see FIG. 8). The contact portion 109 is included in the first piece portion 106A. The third point R is, for convenience, the center of the contact portion 109 in the left-right direction. A virtual triangle having the first point P, the second point Q, and the third point R as vertices is called a virtual triangle T (see FIG. 8), and the first side connecting the first point P and the third point R. The side connecting the second point Q and the third point R is called the second side, and the side connecting the first point P and the second point Q is called the third side. The virtual triangle T is an isosceles triangle, and the first side is shorter than the second side.

As shown in FIGS. 4 and 7, the pressing member 50 is a leaf spring fixed to the front surface of the rectangular plate 81A by two screws 72 together with the auxiliary plate 96, and is formed in an inverted U shape when viewed from the front. .. The pressing member 50 includes a pressing contact portion 51 at a position upward and slightly to the left of the center in the left-right direction. The pressing contact portion 51 contacts the lower portion 106 of the movable blade 105 and presses it rearward. The pressing contact portion 51 of this example is curved in a partially spherical shape and makes point contact with the movable blade 105. Hereinafter, the position where the pressing contact portion 51 contacts and presses the movable blade 105 is referred to as a pressing position S. The pressing position S is a position on the lower left side of the movable blade center C of the movable blade 105 in front view.

As described above, the first point P and the second point Q move with the movement of the movable blade 105, but even if the first point P and the second point Q move, the pressing position S is the virtual triangle T. include. Here, "the pressing position S is included in the virtual triangle T" means that the pressing position S is included in the virtual triangle T when viewed along the front-rear direction, which is the transport direction of the print medium 7, and the front surface. It includes that the pressing position S is on any of the first side, the second side, and the third side of the virtual triangle T in the visual view.

Hereinafter, among the movable ranges of the movable blade 105, the range in which the second blade portion 102 contacts the first blade portion 101A is referred to as a specific movable range. The upper end of the specific movable range is the vertical position of the movable blade 105 at which the movable blade center C of the movable blade 105 is at the same height as the first blade portion 101A. Except for this vertical position, in the specific movable range, the first inclined blade portion 102A contacts the first blade portion 101A at the first point P, and the second inclined blade portion 102B is the first at the second point Q. It comes into contact with the blade portion 101A.

The movable blade driving mechanism 130, which is a mechanism for moving the movable blade 105 in the vertical direction, will be described with reference to FIGS. 3 and 6. The movable blade drive mechanism 130 includes a second frame 82 (see FIG. 2), a motor 131, an intermediate gear 132, a rotating body 135, a pin 138, and an engaging groove 142. The second frame 82 is a sheet metal fixed to the first frame 81 (see FIG. 2). The motor 131 is fixed to the second frame 82 with screws (not shown). The output shaft 131A of the motor 131 extends inclined from the upper left to the lower right, and the worm 131B is fixed. The intermediate gear 132 is rotatably supported by a support shaft 122 projecting rearward from the second frame 82.
The intermediate gear 132 includes a large-diameter gear 132A and a small-diameter gear 132B in this order from the front side. The large diameter gear 132A is a worm wheel that meshes with the worm 131B. The rotating body 135 is rotatably supported by a support shaft 123 projecting rearward from the second frame 82. In other words, the rotating body 135 is rotatably supported by the second frame 82. The rotating body 135 is formed with a gear portion 135A that meshes with the small diameter gear 132B. When the output shaft 131A of the motor 131 rotates, the rotating body 135 rotates via the worm 131B and the intermediate gear 132.

The engaging groove 142 is formed in the lower portion 106 of the movable blade 105 and is located in front of the through hole 93.
The engaging groove 142 is an elongated hole extending in the left-right direction in parallel with the first blade portion 101A, and opens in the front-rear direction in this example. The pin 138 is eccentric to the support shaft 123 by a predetermined radius on the rotating body 135. The pin 138 projects rearward from the rotating body 135, engages with the engaging groove 142, and is inserted into the through hole 93. The pin 138 rotates on a circle having a predetermined radius by the rotation of the rotating body 135. The size of the through hole 93 is formed so that it does not come into contact with the inner wall surface of the through hole 93 even if the pin 138 rotates.

As the pin 138 slides with respect to the engaging groove 142 as the rotating body 135 rotates, the movable blade 105 has a lower end position (see FIG. 3) which is the lower end of the movable range and an upper end which is the upper end of the movable range. Move between positions (see FIG. 5). When the movable blade 105 is in the lower end position, only a pair of extending portions 104 in the upper portion 103 come into contact with the fixed blade 101. When the movable blade 105 is in the upper end position, the movable blade center C is located above the first blade portion 101A of the fixed blade 101.

The printing operation of the printing apparatus 1 will be described with reference to FIGS. 1 and 2. Before the start of the printing operation, the roll 8 is accommodated in the accommodating portion 6, the tip of the printing medium 7 is arranged near the discharge port 32, and the front cover 30 is closed. When the user inputs a printing operation start instruction to the operation unit 39, the printing device 1 drives the transfer motor. The driving force of the transfer motor is transmitted to the platen roller 26 via a gear train (not shown) and a roller gear 25, and the platen roller 26 rotates.
The transport means 27 transports the print medium 7 toward the cutting device 100. At the same time, the printing device 1 drives the printing head 29 of the printing means 21 to print a predetermined character on the printing medium 7. Characters are characters, figures, symbols, and the like. By the above operation, the printing device 1 conveys the print medium 7 while printing, and the print medium 7 is discharged from the discharge port 32. When the printing device 1 stops driving the transfer motor and the printing head 29, the printing operation ends.

The cutting operation of the printing apparatus 1 will be described with reference to FIGS. 3, 4, and 6. The cutting operation is performed after the printing operation. The printing device 1 drives the motor 131. The driving force of the motor 131 is transmitted to the rotating body 135 via the worm 131B and the intermediate gear 132. As a result, the rotating body 135 rotates clockwise in front view, and the pin 138 moves from the lower side to the upper side. When the pin 138 slides with respect to the engaging groove 142, the movable blade 105 moves upward from the lower end position while bringing the first piece portion 106A into contact with the guide portion 96A and the rectangular plate 81A.

When the movable blade 105 that has entered the specific movable range moves upward, the contact points between the movable blade 105 and the fixed blade 101 are two points, the first point P and the second point Q. The movable blade 105 cooperates with the first blade portion 101A of the fixed blade 101 to sandwich the print medium 7 at the first point P and the second point Q. As a result, cuts are made at both ends of the print medium 7 in the left-right direction, and the cuts gradually extend toward the center C of the movable blade of the print medium 7 as the movable blade 105 moves upward. When the movable blade 105 passes through the upper end of a specific range, the print medium 7 is cut in the left-right direction. After that, the movable blade 105 reaches the upper end position, and the pin 138 reaches the substantially center in the left-right direction of the engaging groove 142.
The printing device 1 continuously rotates and drives the motor 131. Pin 138 continues to rotate clockwise in front view, moving from top to bottom. As a result, the movable blade 105 moves from the upper end position to the lower end position. When the movable blade 105 reaches the lower end position, the printing device 1 stops driving the motor 131. The user can take out the cut printed print medium 7 from the discharge port 32.

8 to 18, the conditions for the cutting device 100 to perform a good cutting operation will be described. The force which the first inclined edge portion 102A is pressed against the first edge portion 101A in the first point P and _{F 1L,} the force which the second inclined blade portion 102B is pressed against the first edge portion 101A in the second point Q Let F _{1R be,} and let F ₂ be the force with which the first piece 106A is pressed against the rectangular plate 81A at the third point R. If one of F _1L and F _1R does not meet the appropriate pressing force, cutting failure is likely to occur. As an example, when F _1L is excessively small with respect to F _1R (including the case where F _1L becomes 0), printing sandwiched between the first inclined blade portion 102A and the first blade portion 101A. The medium 7 may bend downward without being cut and may enter between the movable blade 105 and the fixed blade 101. In order to suppress this kind of cutting failure that is particularly likely to occur when the print medium 7 is thin and soft, the pressing force by the pressing member 50 is the first point P and the second point Q regardless of the vertical position of the movable blade 105. It is desirable that they act as evenly as possible and that both F _1L and F _1R are sufficiently secured. If the pressing position S is arranged so as to satisfy such a condition, cutting defects can be suppressed.

However, F _1L and F _1R do not have to have exactly the same pressing force. Even if F _1L and F _1R have slightly different pressing pressures, the print medium 7 is sandwiched between the movable blade 105 and the fixed blade 101 and cuts satisfactorily. Further, in order for F _1L and F _1R to be as even as possible regardless of the vertical position of the movable blade 105, a configuration is adopted in which the second piece 106B does not contact the first frame 81, and the tilted posture of the movable blade 105 is changed. It is desirable that it is defined by the first point P, the second point Q, and the third point R.

Hereinafter, in order to search for an appropriate arrangement position of the pressing position S, the definition of the XY coordinates, the definition of various values, the derivation of the relational expressions of various values, and the graphing of F _1L and F _1R are performed in order. In the following description using FIGS. 8 to 18, it is assumed that the movable blade 105 is in the specific movable range.

XY coordinates are defined with reference to FIG. The X-axis extends in the left-right direction, with the left direction as the positive direction.
The Y-axis extends in the vertical direction, and the downward direction is the positive direction. The origin of the XY coordinates is a position in the left-right direction that is the center C of the movable blade and a position in the up-down direction of the first blade portion 101A of the fixed blade 101. In the following description, the X coordinate values of the first point P and the second point Q are x and −x, respectively, and the Y coordinate value of the movable blade center C is y. When the movable blade 105 rises within the specific movable range, both x and y approach 0. Further, when the inclination of the first inclined blade portion 102A is α, the coordinates of the first point P, the second point Q, and the third point R are (x, 0), (−x, 0), (A, respectively). ₂ , represented by αx + B). Here, B is the vertical distance from the center C of the movable blade to the third point R.

The definitions of various values and the relational expressions of various values will be described with reference to FIGS. 8 to 12. Assuming that the resultant force of F _1L and F _1R is F ₁ , the following equation (A) holds.
F ₁ = F _1L + F _1R ... Equation (A)

As shown in FIGS. 8 and 9, the distance between the movable blade center C and the pressing position S in the left-right direction is defined as A. Let A ₂ be the distance between the center C of the movable blade and the third point R in the left-right direction. Similarly, in the left-right direction, the distance between the third point R and the first point P, the distance between the third point R and the second point Q, and the distance between the third point R and the pressing position S are a _1L , a _1R , and a, respectively. _Let it be ₂ .

In a plan view, the following equation (B) is established by balancing the moments of the movable blade 105 centered on the pressing position S.
a _1L・ F _1L + a ₂・ F ₂ = a _1R・ F _1R・ ・ ・ Equation (B)
Further, the following equations (C), (D), and (E) are established in relation to a _1L , a _1R , a ₂ , A, and A ₂ .
a _1L = x-A ... Equation (C)
a _1R = x + A ・ ・ ・ Equation (D)
a ₂ = A _2- A ・ ・ ・ Equation (E)

As shown in FIG. 10, the vertical distance between the point of action of F ₁ (that is, the first point P and the second point Q) and the pressing position S is set to B _1, and the vertical distance between the pressing position S and the third point R is Let the distance be B ₂ . Further, let F be the force with which the pressing member 50 presses the movable blade 105 at the pressing position S. Equations (F) and (G) are established by the balance of the forces of the movable blade 105 in the side view and the balance of the moments.
F = F ₁ + F ₂ ... Equation (F)
(B ₁ + B ₂ ) ・ F ₁ = B ₂・ F ・ ・ ・ Equation (G)
Further, the relational expression (H) is established in relation to B, B ₁ , B ₂ , x, and y.
B ₂ = y + BB ₁ = αx + BB ₁ ... Equation (H)
The following two equations are derived from the equations (A), (B), (F), and (G).
F _1L = ((a _1R・ B ₂ −a ₂・ B ₁ ) / ((B ₁ + B ₂ ) ・ (a _1L + a _1R ))) ・ F
F _1R = ((a _1L・ B ₂ + a ₂・ B ₁ ) / ((B ₁ + B ₂ ) ・ (a _1L + a _1R ))) ・ F
From the formulas (C) to (E) and (H), the formulas (I) and (J) are established.
F _1L = (((x + A) (αx + BB ₁ )-(A _2- A) B ₁ ) / (2x (αx + B))) ・ F ・ ・ ・ (I)
F _1R = (((x-A) (αx + B-B ₁ ) + (A _2- A) B ₁ ) / (2x (αx + B))) ・ F ・ ・ ・ (J)
Formulas (I) and (J) represent F _1L and F _1R according to the value of x (that is, according to the vertical position of the movable blade 105). Then, the coordinates (A, B ₁ ) of the pressing position S in the case where the pressing position S is included in the virtual triangle T and the case where the pressing position S is not included are set, and the relationship between x and F _1L , F _1R is graphed. For example, in which case, it is possible to identify whether the difference between F _1L and F _1R is less likely to occur as the value of x changes. Therefore, when the condition that the pressing position S is always included in the virtual triangle T (hereinafter referred to as a specific condition) is satisfied even if the first point P and the second point Q move with the movement of the movable blade 105. It is necessary to specify the relationship between A and B prior to graphing F _1L and F _1R .

Specific conditions will be described with reference to FIGS. 11 and 12. In order for the specific condition to be satisfied, the first specific condition and the second specific condition must be satisfied. The first specific condition is a condition in which there is a pressing position S on the straight line L ₁ which passes through a third point R and the origin when the movable blade 105 is in the upper end of the specified movable range. The second specific condition is a condition in which the pressing position S is included in the virtual triangle T.

The first specific condition will be examined with reference to FIG. When x = 0, the movable blade 105 is at the upper end of the specific movable range, and the coordinates of the third point R are (A ₂ , B). Lines _{L 1} connecting the origin and the third point R is represented by Y = BX / _{A 2.} When the coordinates (A, B ₁ ) of the pressing position S are on the straight line L ₁ , B ₁ = B · A / A ₂ is established. That is, the following equation (K) holds.
A = A ₂・ B ₁ / B ・ ・ ・ Equation (K)
If the formula (K) is satisfied, the first specific condition is satisfied.

The second specific condition will be examined with reference to FIG. The coordinates of the third point R when the virtual triangle T is formed are (A ₂ , αx + B), and the straight line L ₃ connecting the third point R and the first point P is expressed by the following equation. ..
Y = (αx + B) X / (A _2- x) -x (αx + B) / (A _2- x)
Substituting B ₁ , which is the Y coordinate of the pressing position S, into Y,
B ₁ = (αx + B) X / (A _2- x) -x (αx + B) / (A _2- x)
Therefore, the following relational expression holds.
X = (B ₁ (A _2- x) + x (αx + B)) / (αx + B)
In order for the pressing position S to be arranged inside the virtual triangle T, it is necessary that X> A is established.
Therefore, the following equation holds.
(B ₁ (A _2- x) + x (αx + B)) / (αx + B)> A ₂・ B ₁ / B
Solving this, x> A ₂ · B ₁ / B + (B ₁ −B) / α
Here, since A ₂ · B ₁ / B + (B ₁ −B) / α <0, the following equation (M) holds.
B ₁ <B ² / (αA ₂ + B) ・ ・ ・ Equation (M)
If the equation (M) is satisfied, the second specific condition is satisfied. Then, if both the equations (K) and (M) are satisfied, the specific condition is satisfied.

The positional relationship between the graphed F _1L and F _1R , the virtual triangle T, and the pressing position S will be described with reference to FIGS. 13 to 18. 13, FIG. 15, and FIG. 17 are explanatory views showing changes in the shape of the virtual triangle T as the movable blade 105 rises. In FIGS. 13, 15, and 17, it is shown that the movable blade 105 rises as the first point P and the second point Q approach the origin, and the point R in each drawing is the lower graph. As it becomes, it is in a slightly raised position. 14, 16 and 18 are graphs created based on the equations (I) and (J) _regarding the relationship between x, which is the value of the X coordinate of the first point P, and F _1L and F _1R . The closer x approaches 0, the higher the movable blade 105 is. In addition, in FIG. 13, FIG. 15, and FIG. 17, the illustration of the virtual triangle T when the x-coordinate of the first point P is larger than 5 is omitted. Further, for B and A ₂ , predetermined values are adopted and applied to the formulas (I), (J), (K) and (M).

13 and 14 are explanatory diagrams and graphs when A <A ₂ · B ₁ / B, the equation (K) does not hold, and the equation (M) holds. As shown in FIGS. 13A to 13C, when the first point P and the second point Q approach the origin as the movable blade 105 rises, the pressing position S deviates to the right from the virtual triangle T. .. Then, as shown in FIG. 14, the closer the first point P and the second point Q are to the origin, the larger the difference between F _1L and F _1R becomes. That is, cutting defects are likely to occur.

Further, FIGS. 15 and 16 are explanatory diagrams and graphs when A> A ₂ · B ₁ / B, the equation (K) does not hold, and the equation (M) holds. Also at this time, as shown in FIGS. 15 (A) to 15 (C), the pressing position S deviates to the left from the virtual triangle T when the movable blade 105 is raised, and as shown in FIG. 16, of F _1L and F _1R . The difference becomes extremely large.

As described above, the second blade portion 102 of the movable blade 105 and the first blade portion 101A of the fixed blade 101 come into contact with each other at the first point P and the second point Q. Then, as the movable blade 105 rises, the first point P and the second point Q move in directions closer to the origin. In FIG. 13C, when the first point P and the second point Q move to a position near the origin and the distance between the first point P and the second point Q (indicated by W ₁ ) becomes equal to or less than a predetermined distance, The case where the pressing position S deviates from the virtual triangle T to the right is shown. In FIG. 15C, when the first point P and the second point Q move to a position near the origin and the distance between the first point P and the second point Q (indicated by W ₂ ) becomes equal to or less than a predetermined distance, The case where the pressing position S deviates to the left from the virtual triangle T is shown. When the pressing position S deviates to the outside of the virtual triangle T, a difference occurs between the pressing pressure F _1L acting on the first point P and the pressing pressure F _1R acting on the second point Q, and cutting defects are likely to occur. Was explained logically.

However, when verification is performed with an actual cutting device, even if the position where the pressing position S is provided is located outside the virtual triangle T when the distance between the first point P and the second point Q is 2 mm or less. It was confirmed that no cutting failure occurred.

Next, FIGS. 17 and 18 are explanatory diagrams and graphs when both the equation (K) and the equation (M) are satisfied and the specific conditions are satisfied. As shown in FIGS. 17A to 17C, when the movable blade 105 is raised, the pressing position S does not deviate from the virtual triangle T, and as shown in FIG. 18, there is almost no difference between F _1L and F _1R. It turns out. Therefore, even when the print medium 7 is thin and soft, it can be derived that the cutting device 100 can perform a good cutting operation if a specific condition is satisfied.

From the above, it is most desirable that the pressing position S is always included in the virtual triangle T even if the first point P and the second point Q move with the movement of the movable blade 105, but the present invention is limited to this. Not done. That is, in the entire movement range in which the first point P and the second point Q move with the movement of the movable blade 105, the distance between the first point P and the second point Q is the maximum distance from each other. It is sufficient that the pressing position S is included in the virtual triangle T in the partial movement range up to a position that is very close to 2 mm. That is, the configuration in this case is also included in the present invention.

If the equation (M) does not hold, the pressing position S deviates from the virtual triangle T when the movable blade 105 rises, regardless of whether the equation (K) holds, and the difference between F _1L and F _1R is extreme. It grows big. The explanatory diagrams and graphs are the same as those in FIGS. 13 to 16, so detailed illustrations will be omitted.

As described above, the second blade portion 102 is formed in a V shape at the upper end portion of the movable blade 105. The contact portion 109 is formed at the lower end of the movable blade 105 and comes into contact with the rectangular plate 81A of the first frame 81. The pressing member 50 presses the movable blade 105 in the rear direction from the movable blade 105 toward the fixed blade 101 and the rectangular plate 81A of the first frame 81. When the movable blade 105 rises within the specific movable range, the pressing position S is included in the virtual triangle T. Since the pressing position S is included in the virtual triangle T, the pressing force of the pressing member 50 always acts on the first point P, the second point Q, and the third point R. That is, due to the pressing force of the pressing member 50, the second blade portion 102 is always pressed against the first blade portion 101A of the fixed blade 101 at two points, the first point P and the second point Q. Since the first point P and the second point Q are the cutting points of the printing medium 7 which is the object to be cut, the printing apparatus 1 can reliably perform even a thin and soft printing medium 7 in which cutting defects are likely to occur. Can be cut.

Even if the first point P and the second point Q move with the movement of the movable blade 105, the pressing position S is always included in the virtual triangle T. Since the pressing position S is always included in the virtual triangle T, the second blade portion 102 is always pressed against the first blade portion 101A. Therefore, the movable blade 105 can satisfactorily cut the print medium 7 in cooperation with the fixed blade 101.

The lengths of the first side and the second side of the virtual triangle T are different from each other. Even if the third point R, which is the point where the contact portion 109 contacts the first frame 81, is provided at a position where the lengths of the first side and the second side of the virtual triangle T are different, the pressing member 50 The pressing force can be reliably applied to the first point P, the second point Q, and the third point R.

At the lower end of the movable blade 105, the first piece 106A and the second piece 106B are arranged side by side at one end and the other end in the left-right direction in which the first blade 101A extends. The first piece 106A includes the contact 109, and the second piece 106B does not contact the first frame 81. Since the second piece 106B does not come into contact with the first frame 81, the first piece 106A can surely come into contact with the rectangular plate 81A of the first frame 81. Therefore, the point where the first piece portion 106A contacts the first frame 81 can be set as the third point R.

The pressing member 50 includes a pressing contact portion 51, and the pressing contact portion 51 is curved. Since the pressing contact portion 51 is curved, the area in which the pressing contact portion 51 contacts the movable blade 105 can be reduced. As a result, the frictional resistance generated by the contact between the pressing member 50 and the movable blade 105 is reduced. Therefore, the movable blade 105 can move smoothly in the vertical direction.

The pressing member 50 is a leaf spring, whereby the cutting device 100 can be easily configured.

The rotating body 135 is rotatably supported by a second frame 82, which is different from the first frame 81. The pin 138 is provided at a position eccentric by a predetermined radius from the support shaft 123 which is the center of rotation of the rotating body 135, engages with the engaging groove 142, and is inserted into the through hole 93. The motor 131 rotates the rotating body 135. When the rotating body 135 is rotated by the rotation of the motor 131, the pin 138 slides with respect to the engaging groove 142, so that the movable blade 105 moves in the vertical direction. Since the pin 138 provided on the rotating body 135 directly engages with the engaging groove 142 of the movable blade 105, compared with the case where the pin 138 is indirectly connected to the movable blade 105 via another member. The cutting device 100 can simplify the movable blade drive mechanism 130.

In the above embodiment, the vertical direction is an example of the "moving direction" of the present invention. The upper side is an example of "one side" of the present invention. The lower side is an example of the "other side" of the present invention. The rear direction is an example of the "first direction" of the present invention.

The present invention is not limited to the above examples. The first piece 106A may have a triangular shape that tapers toward the lower side instead of being rectangular in front view. At this time, the lower end of the first piece 106A is the contact portion 109, and the contact portion 109 and the third point R coincide with each other in front view.

The movable blade 105 may be movable in the front-rear direction, for example, instead of being movable in the vertical direction. In this case, the first blade portion 101A may be formed at the rear end of the fixed blade 101, and the second blade portion 102 may be formed at the front end of the movable blade 105.

The pressing contact portion 51 may have, for example, a partially cylindrical surface shape that is curved rearward to be convex and extends in the left-right direction. In this case, the pressing contact portion 51 makes line contact with the movable blade 105, and the pressing position S is an arbitrary position of the contact point between the pressing contact portion 51 and the movable blade 105, and at least one of the arbitrary positions. One position may be included in the virtual triangle T. The pressing member 50 may be a spring different from the leaf spring. The engaging groove 142 may be a hole that opens only in the front instead of a hole that opens in the front-rear direction.

When the upper end position of the movable blade 105 is reached, the motor 131 may be reversely driven. Even at this time, the pin 138 slides with respect to the engaging groove 142 while rotating from the upper side to the lower side, and the movable blade 105 can return from the upper end position to the lower end position. The printing device 1 may be capable of supporting a printing medium thicker than the printing medium 7. In this case, the user may select a desired cutting object and store it in the storage unit 6 of the printing device 1.

1 Printing device 7 Printing medium 21 Printing means 27 Conveying means 50 Pressing member 51 Pressing contact part 81 First frame 82 Second frame 93 Through hole 100 Cutting device 101 Fixed blade 101A First blade 102 Second blade 105 Movable blade 106A 1st piece 106B 2nd piece 109 Contact part 130 Movable blade drive mechanism 131 Motor 135 Rotating body 138 Pin 142 Engagement groove P 1st point Q 2nd point R 3rd point S Pressing position T Virtual triangle

Claims (8)

1st frame and
A substantially flat plate-shaped fixed blade having a first blade portion extending linearly and fixed to the first frame, and a substantially flat plate-like movable blade provided movably on one side in the moving direction. It is formed in a V shape at the end, and is formed at the second blade for cutting the object to be cut in cooperation with the first blade and at the other end in the moving direction. , A movable blade having a contact portion in contact with the first frame,
A movable blade drive mechanism that moves the movable blade,
A pressing member for pressing the movable blade in a first direction from the movable blade to the fixed blade and the first frame is provided.
The pressing positions at which the pressing member presses the movable blade are the first and second points where the second blade portion contacts the first blade portion, and the contact portion is on the first frame. A cutting device characterized in that it is included in a virtual triangle whose apex is a third point of contact. The cutting device according to claim 1, wherein the pressing position is always included in the virtual triangle even if the first point and the second point move with the movement of the movable blade. The length of the first side of the virtual triangle connecting the first point and the third point and the length of the second side of the virtual triangle connecting the second point and the third point are different from each other. The cutting device according to claim 1 or 2. The other end of the movable blade has a first piece and a second piece arranged side by side at one end and the other end in the direction in which the first blade extends.
The first piece includes the contact portion and includes the contact portion.
The cutting device according to any one of claims 1 to 3, wherein the second piece does not come into contact with the first frame. The pressing member includes a pressing contact portion that contacts the movable blade at the pressing position.
The cutting device according to any one of claims 1 to 4, wherein the pressing contact portion is curved. The cutting device according to any one of claims 1 to 5, wherein the pressing member is a leaf spring. The movable blade drive mechanism is
An engaging groove formed on the movable blade and extending in parallel with the first blade portion,
A rotating body rotatably supported by a second frame different from the first frame,
A pin provided at a position eccentric from the center of rotation in the rotating body, engaged with the engaging groove, and inserted into a through hole formed in the first frame.
A motor for rotating the rotating body is provided.
The method according to any one of claims 1 to 6, wherein when the rotating body is rotated by the rotation of the motor, the pin slides with respect to the engaging groove to move the movable blade. Cutting device. The cutting device according to any one of claims 1 to 7.
A printing means that executes printing on a printing medium that is the object to be cut, which is cut by the cutting device.
A transport means for transporting the print medium printed by the printing means toward the cutting device, and a transport means.
A printing apparatus comprising.

Images