JPH09254086A - Cutter mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the necessity for a fixed blade and make a merit left as it maintainable of good cutting performance, high durability, etc., of a cutter mechanism using the fixed blade. SOLUTION: An edge raised thin disk-shaped main blade 4 and cylindrical subblade 5 are journalled with the fellow edge points slightly superposed in each other further with the main blade 4 having a fine angle tilt relating to a horizontal direction of the subblade 5. When a carriage 2 is moved to be slid on a running rail part 1b, the main blade 4 and the subblade 5, while bringing an edge point into contact in one point, make rotation in a reverse direction to each other, a cut sheet coming to be guided by a guide part is cut. The cut sheet, preventing occurrence of jamming, is made to make refuge at any time to a reverse surface side of a base part 1a by a guide part provided in the carriage 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter mechanism incorporated in OA equipment such as facsimile machines, copiers and printers, and home electric appliances to cut a rolled sheet into a desired length. The present invention relates to a cutter mechanism in which a cutting blade is attached to a base that moves along a linear rail, and a blade provided on the base cuts a sheet when the base moves.

[0002]

2. Description of the Related Art Conventionally, as a cutter mechanism of this type,
Moves the blade edge of the moving blade while pressing it against a long plate-shaped blade having a linear blade edge (hereinafter referred to as the fixed blade) to cut roll paper, etc. placed between the fixed blade and the movable blade. The method of doing is known. An example of such a cutter mechanism is the invention described in Japanese Patent Laid-Open No. 6-134692 shown in FIG. This conventional example will be described in detail below.

In this cutter mechanism, the fixed blade 20 is provided on the lower surface of a plate-shaped cutter frame 21 and the cutter frame 2
It is attached in parallel to the longitudinal direction of 1 by a fixing means such as welding or a double-sided adhesive tape. Further, the traveling guide portion 22 is provided by bending one end of the cutter frame into a key shape.

A concave slide holding portion 24 of a carriage 23 is fitted to the running guide portion 22, and the carriage 23 and the round blade support base 25 are connected by a connecting arm so as to integrally operate. With such a configuration, the round blade support base 25 can move the fixed blade 20 along the running guide portion 22.
It is possible to slide back and forth in the longitudinal direction of the. Further, the cutter frame 21 is provided with two pulleys at both ends of the fixed blade 20 in the longitudinal direction. One pulley (on the front side in the longitudinal direction in the figure) is attached so as to obtain a rotational force via a pinion and a gear provided on the drive shaft of the motor. A wire, which is tensioned by a coil spring or the like, is spanned between the pulleys as a drive medium for the carriage 23. The carriage 23 is engaged with the wire at a predetermined position. When the motor is driven, the driving force is transmitted to the pinion->gear->pulley-> wire and the carriage 23 slides back and forth along the traveling guide portion 22. Further, the fixed blade 20 is provided on the outer peripheral portion of the carriage 23 before the sheet is cut due to the sliding operation.
The front Russell portion 27 that guides the sheet to a contact point (hereinafter, referred to as a “cutting point”) between the blade and the round blade 26, and the sheet that has been cut is evacuated at any time so as not to cause an obstacle such as jamming during sheet cutting. The escape groove 28 is formed.

The carriage 23 and the round blade support 25 are connected by a connecting arm so that they can operate integrally.
The round blade 26 is disposed so that the blade edge slightly overlaps the blade edge of the fixed blade 20, and is pressed against the fixed blade 20 with a predetermined pressure. Further, although not visible in this figure, a pressing plate (rolling wheel) that integrally rotates coaxially with the round blade 26 is formed on the back surface of the round blade 26. Since a part of this pressing plate is in contact with the fixed blade 20, the carriage 2
With the sliding movement of 3, the round blade 26 moves while rotating on the fixed blade 20.

Next, the roll paper cutting operation of such a conventional cutter mechanism will be described. Initially carriage 23
Stands by at the sliding limit point on the front side in the longitudinal direction of the cutter frame 21 in the figure. When a pulling force is applied to the wire by driving the motor, the carriage 23 slides on the traveling guide portion 22, and a round blade 26 rotatably supported by a round blade support 25 provided integrally with the carriage 23. However, the fixed blade 20 with the cutting edges slightly overlapped
Move on. At this time, the round blade 26 is pressed against the fixed blade 20 with a predetermined pressure and moves while rotating integrally with the pressing plate. When the carriage 23 reaches one end of the roll paper, the front Russell portion 27 provided at the leading end of the carriage 23 takes in the roll paper end in a direction leading to the cutting point. The roll paper guided to the cutting point is cut by the rotating circular blade 26 and the fixed blade 20, and after the cutting is completed, the escape groove 28 is optionally retracted in a direction that does not interfere with the ongoing cutting operation. After the roll paper is cut, when the carriage 23 reaches the sliding limit point, the motor is rotated in the reverse direction and the wire is pulled in the opposite direction to return the carriage 23 to the standby position, whereby the cutting operation is completed.

As an example of improvement of the "fixed blade + round blade" cutter mechanism, the invention described in Japanese Patent Laid-Open No. 7-124892 shown in FIG. 15 can be cited. This cutter mechanism has a structure in which the blade tip of the round blade 26 is tilted by a small angle with respect to the fixed blade 20 and is axially supported to maintain point contact. As a result, the circular blade 26 can be rotated by the moment generated at the blade edge as the carriage 23 moves. Therefore, rolling wheels for rotating the circular blade 26 are not required. Further, by adopting the above-mentioned configuration, the circular blade 26 moves while sliding on the blade edge of the fixed blade 20 while rotating, so that good cutting performance and improved blade durability can be obtained. The embodiment of the cutter mechanism also describes means for eliminating the need for special treatment such as heat treatment or blade attachment to the fixed blade 20.

On the other hand, some examples of a cutter mechanism which does not use a fixed blade have been proposed. This is JP-A-7
The inventions described in Japanese Patent Laid-Open No. 100791 and Japanese Patent Laid-Open No. 7-24782 can be cited as examples. Such a conventional cutter mechanism has two blades that are positioned so that their blade edges slightly overlap each other on a moving body that slides on a linear traveling rail portion, and moves at least one of the blades. It is characterized by rotating with the sliding movement of the body.

In the invention described in Japanese Patent Application Laid-Open No. 7-100791 shown in FIG. 16, "a rotating circular disk-shaped blade 30 and a small fixed auxiliary blade 31 are brought into contact with each other, and a sliding movement of a moving body 32 is performed. A cutter mechanism for cutting a sheet "is described.

Next, Japanese Patent Laid-Open No. 7-2478 shown in FIG.
The features of the invention described in Japanese Patent No. 2 will be described.

In this cutter mechanism, two rotating circular blades 41 and 42 are rotatably supported by a holder 40 so that they are arranged on the front and back sides of the sheet to be cut. In addition, one of the two circular cutting tools 4 is pressed so that only one of the two intersections, which is generated by intersecting the peripheral edges of the cutting edges, is involved in the cutting.
1 is brought into contact with the other circular blade 42 with a slight angle. At least one of the two circular blades is forcibly rotated according to the sliding movement of the holder 40.
In addition, the holder 40 has the connecting portion 44 that traverses the sheet to be cut in order to make one guide path 43 for sliding movement and to dispose the two circular blades on the front and back sides of the sheet to be cut. The connecting portion 44 of the holder 40 is always arranged on the rear side in the traveling direction of the circular blade. Further, the connecting portion 44 is provided with a guide portion 45 for guiding the end portion of the cut sheet to be cut upward.

[0012]

A conventional fixed blade + round blade type cutter mechanism requires a fixed blade. Fixed blades used in such cutter mechanisms must have very precise linearity to provide good cutting performance. In addition, the manufacturing of the fixed blade basically had to strictly meet the following conditions. (1) A steel plate having a hardness as high as possible (mainly “special purpose steel” in terms defined by JIS) is used and heat-treated. (2) In order to provide highly accurate linearity, distortion removal or surface grinding is performed. (3) In order to have a sharp edge, a blade is attached to the end surface used as a blade. These inevitably increase the manufacturing cost of the fixed blade.

According to the invention described in Japanese Patent Application Laid-Open No. 7-124892, the conventional "fixed blade + round blade" type can be used even if the stamped special-purpose steel is used as it is as a fixed blade without heat treatment or cutting work. It became possible to maintain the same cutting performance as the cutter mechanism of, and the manufacturing conditions of the fixed blade could be greatly eased. However, the need for the fixed blade itself and the requirement for the fixed blade to be highly linear are still the same, so it was difficult to pursue further cost reduction.

Further, since the cutting performance of such a cutter mechanism depends not only on the linearity of the fixed blade but also on the moving accuracy of the moving blade, a certain accuracy is required for the construction of the traveling rail portion.

As described above, in constructing the conventional cutter mechanism, it is necessary to increase the number of parts and devise in the manufacturing process, so that the cutter mechanism used for the popular low-priced product is limited in terms of cost reduction. was there.

Further, high precision is required for all three points of the frame, the fixed blade, and the traveling rail, and if any one of them is missing, the cutting performance of the device is affected.

Furthermore, the problem of accuracy has a significant effect on the maintainability of the apparatus, for example, the entire cutter mechanism must be replaced even if the blade edge of the fixed blade is damaged. Was affecting.

On the other hand, since the cutter mechanism represented by the inventions disclosed in Japanese Patent Laid-Open Nos. 7-100791 and 7-24782 can be constructed without using a fixed blade, the above-mentioned problems are solved. can do. However, if the contact point between the round blade and the auxiliary blade that move together with the carriage is always fixed, as in the cutter mechanism disclosed as an example in Japanese Patent Laid-Open No. 7-100791, regardless of whether or not the sheet is cut ( However, even if the carriage simply moves, a part of the auxiliary blade is always scraped by the round blade and continues to be worn, and the cutting performance deteriorates extremely quickly. In the detailed description of the examples, there is a proviso that "the auxiliary blade may be a circular blade similar to the rotary blade, and this may be rotatably attached", but the configuration etc. is not explicitly stated, and will be described next. Japanese Patent Laid-Open No. 7-2478
It does not exceed the contents of the cutter mechanism described in Japanese Patent Publication No. 2 publication.

When two thin disk-shaped circular blades having substantially the same size are brought into contact with each other at one point like the cutter mechanism described in Japanese Patent Application Laid-Open No. 7-24782, as shown in FIG. The opening angle of the blades (the angle between the circumferential tangents of the blades at the contact point) inevitably increases. The opening angle is considerably larger than that in the case of “contacting the fixed blade and the round blade” in FIG. 4B. With scissors, this state can be likened to "a state where the blade is considerably open". It is generally known as a common sense in daily life that "when cutting the scissors by pressing them with the opening angle fixed, the smaller the angle between the blades is, the better the sharpness is."
In order to obtain the cutting performance of a cutter mechanism using a fixed blade with such a configuration, the pressing force between the round blades is increased, or the sharp blades are brought into point contact with extremely high precision. Will be taken. However, these may cause No. 2 hits (a state where there is contact at a position unrelated to cutting and the cutting edge floats) or wear due to contact between cutting edges (blade spill), so a fixed blade was used. There was a problem that cutting performance could not be provided as stably as the cutter mechanism. Further, when the round blades are contacted so as to overlap each other, particularly when one of the round blades is brought into contact with a minute angle, the sharp edge of the other round blade overlaps the sheet to be cut. There is a possibility that a portion may hit the sheet during the cutting operation and adversely affect the sheet to be cut. In this way, the conventional "round blade + round blade" type cutter mechanism is difficult to apply to devices (facsimile, printer, etc.) that must cut thin and hygroscopic paper such as thermal paper tens of thousands of times or more. It was

Further, in this embodiment, the cut sheet (cutting piece) cut is guided to the guide portion and then rides on the connecting portion of the holder. The cutting pieces fall into the stacker below and are held, and the holder moves to the return operation (sliding movement in the opposite direction) in preparation for the next cutting, but the last end of the cutting pieces remains in the connecting part. If the return operation is performed with the cut piece left, there is a risk that the cutting piece may be caught again between the round blades, or the holder may flick the cutting piece to the side. For this reason, (1) the rear end of the cut piece must completely ride over the connecting portion and must be dropped before the return operation can be started. (2) It is necessary to form a shape for preventing the rear end of the cut piece from remaining in the connecting portion. (3) The stacker space for holding the cut pieces must be wide. The height from the connecting part to the stacker must be sufficient. There are also issues such as.

The present invention eliminates all the above-mentioned drawbacks,
An object of the present invention is to provide a cutter mechanism that does not require a fixed blade and can maintain the advantages such as "good cutting performance" and "high durability" of the cutter mechanism using the fixed blade.

[0022]

In order to solve the above-mentioned problems, a cutter mechanism according to claim 1 of the present application has a frame provided so as to traverse a sheet-shaped object to be cut, and a movement path traversing the object to be cut. And a table part for setting the object to be cut or a table part for assisting the conveyance of the object to be cut, and a shape capable of reciprocating on the moving path and straddling the object to be cut, and a blade on each of the front and back of the object to be cut. The first rotation, which is a disk-shaped blade having a blade on the periphery, is stored in the blade base so that the blade edges of the blade base overlap with each other, and is rotatably supported by the blade base. A second rotary blade, which is a cylindrical blade having a blade at one end of the blade and the outer peripheral edge, and a biasing means for pressing the blade edge of the first rotary blade to the blade edge of the second rotary blade with a predetermined pressure, At least one of the rotary blades is interlocked with the movement of the blade base. It gives the rotation of the constant period, and having a rolling means for rotating at a constant period the second rotating blade and the first rotating blade in opposite directions.

A cutter mechanism according to a second aspect of the present invention is the cutter mechanism according to the first aspect, wherein the first rotary blade is provided in the storage portion of the base portion of the blade base on a side where an object to be cut is installed, and One of the storage parts has the second rotary blade, and a cross contact point of the first rotary blade and the second rotary blade is substantially coincident with an object installation surface of the base part. Is characterized by.

A cutter mechanism according to a third aspect is the cutter mechanism according to the first and second aspects, wherein the second rotary blade is a hollow cylindrical blade having a blade at one end of an outer peripheral edge thereof.

A cutter mechanism according to a fourth aspect is the cutter mechanism according to the first to third aspects, wherein the blade base is cut at a contact point between the first rotary blade and the second rotary blade before cutting the workpiece. It is characterized by having a guide part for guiding an object and a guide part for retracting a separated piece of an object to be cut.

A cutter mechanism according to a fifth aspect of the present invention is the cutter mechanism according to the fourth aspect, wherein the guide portion holds the first sloped surface that suppresses the lifting of the object to be cut from the table portion, and the object to be cut from the table portion. And a second inclined surface for scooping up the drooping, and a flat portion having a minute interval continuous to the first and second inclined surfaces in a funnel cross section, and converges toward the contact points of the first and second rotary blades. Is characterized in that.

A cutter mechanism according to a sixth aspect of the present invention is the cutter mechanism according to the fifth aspect, wherein a flat portion that is continuous in a funnel cross-section on the second slope that extends so as to project to the side of the object to be cut, and the flat surface. It is characterized in that it has an inclined portion which inclines from the separated side of the object to be cut toward the base side from the projecting end of the part toward the starting point on the blade advancing direction side when the second slope is cut.

A cutter mechanism according to a seventh aspect is the cutter mechanism according to any one of the first to sixth aspects, wherein the second rotary blade is pivotally supported so that a cutting edge surface thereof is parallel to a traveling direction of a blade base during cutting, and The first rotary blade is pivotally supported so as to be inclined at a predetermined angle with respect to the blade tip surface of the second rotary blade.

A cutter mechanism according to an eighth aspect is the cutter mechanism according to any one of the first to seventh aspects, characterized in that the cutter mechanism has a drive / transport mechanism for reciprocating the blade base along the movement path.

[0030]

Embodiments of the cutter mechanism according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention. In FIG. 1, reference numeral 1 is a frame formed in a long plate shape having a T-shaped cross section. The portion corresponding to the upper surface of the "T" of the frame 1 is provided with a sheet to be cut at the time of cutting (in the embodiment, assists the conveyance of the sheet to be cut) 1a
It is. Also, the rib protruding from one end of the horizontal bar of "T"
It is the traveling rail portion 1b.

The carriage 2 (blade base) is attached by inserting the running rail portion 1b into the rail groove 3 from one end of the frame 1 in the longitudinal direction (front side to back side in FIG. 1). Accordingly, the carriage 2 can freely slide and reciprocate in the longitudinal direction of the frame. When the carriage 2 is attached to the frame, the carriage 2 has a shape having rotation shafts on the front side (upper side in FIG. 1) and the back side (lower side in FIG. 1) with the base portion 1a as a boundary.

The carriage 2 stores two rotary blades, one on the front and one on the back of the base 1a. A disk-shaped round blade stored on the front side with reference to the base 1a is called a main blade 4, and a hollow cylindrical round blade stored on the back side is called a sub blade 5. The main blade 4 and the sub blade 5 are rotatably supported in the carriage 2, and the rotary shaft 11 of the main blade 4 and the rotary shaft 14 of the sub blade 5 are connected as shown in FIG. 3B. The straight line is arranged so as to be perpendicular to the longitudinal direction of the frame.

Next, the structures of the main blade 4 and the sub blade 5 will be described in detail.

The rotary shaft 11 is sandwiched between the carriage 2 and the lid 8, and the main blade 4, the main blade bearing 6, and the main blade bearing cap 7 are rotatably supported coaxially and integrally in the carriage 2. . The main blade 4 is pressed by a leaf spring 9 with a predetermined pressure. The main blade bearing cap 7 is fitted with the main rolling wheel 10, a portion of which is in contact with the surface of the base 1a. With this configuration, the main blade 4 can rotate as the carriage 2 reciprocates. The portion of the carriage 2 in which the main blade 4 is stored (the front side portion of the transport guide 1a) is called the main blade storage portion 2a.

The sub blade 5 is fitted into the sub blade bearing 12 and
Like the main blade 4, it rotates coaxially and integrally within the carriage 2. Further, the auxiliary rolling wheel 13 is fitted in the auxiliary blade bearing 12, and a part of the auxiliary rolling wheel 13 is configured to come into contact with the rear surface of the transport guide 1a. A portion of the carriage 2 in which the sub blade 5 is stored is referred to as a sub blade storage portion 2b.

As shown in FIG. 2, when the thin disc-shaped main blade 4 and the hollow cylindrical sub-blade 5 having sharp cutting edges are slightly supported, the cutting edges slightly overlap each other, and The main blade 4 makes a small angle θ (0.5 ° to 10 °) with the sub blade 5.
The contact is made with an inclination of (°, preferably about 3 °). The main blade 4 also has an inclination of a small angle σ (0.5 ° to 6 °, preferably about 3 °) with respect to the reciprocating direction of the carriage 2. Therefore, the main blade 4 and the sub blade 5 can be brought into point contact with each other. In addition, since the sub-blade 5 is configured in a cylindrical shape, it is possible to substitute the feature of the conventional fixed-blade type cutter mechanism that the main blade is located at a right angle to the horizontal fixed blade, and is microscopically A fixed blade + round blade configuration can be realized. With these configurations, good cutting performance can be obtained. When the main blade 4 and the sub blade 5 rotate due to the reciprocating movement of the carriage 2, the blade tip of the main blade 4 and the blade tip of the sub blade 5 rotate while keeping sliding contact. The main blade 4 and the sub blade 5
The contact point (hereinafter, referred to as a cutting point) is substantially aligned with the surface of the base 1a.

With the above structure, when the carriage 2 reciprocates on the traveling rail portion 1b, the main rolling wheels 10
Since the sub-rolling wheel 13 and the sub-rolling wheel 13 roll on the front and back sides of the transport guide 1a, respectively, the main blade 4 and the sub-blade 5 rotate in opposite directions while contacting each other at one point of the cutting edge. In this embodiment,
The main blade 4 and the sub blade 5 obtain the rotational force by the respective rolling wheels, but since the main blade 4 is pressed by the sub blade 5, the main blade 4 and the sub blade 5 are shown in FIGS. 13 (a) and 13 (b), for example. As described above, the above-described operation can be realized even if only the main rolling wheel 10 or the sub rolling wheel 13 exists. This is because when the main rolling wheels 10 roll due to the reciprocating movement of the carriage and the main blade 4 rotates, the sub blade 5 rotates in the opposite direction due to the moment generated by the pressing force of the leaf spring 9. As described above, if there is at least one of the rolling wheels, the above-described rotation operation can be performed.

Further, the sub-blade 5 can be replaced with a hollow-cylindrical cutter, which is formed by pressing a disk into a crown shape. An embodiment constructed by using this crown-shaped auxiliary blade is shown in FIG. 13 (c).

Next, the shape of the carriage will be described in detail with reference to FIGS.

In order to stably guide the sheet to be cut to the cutting point along with the sliding movement, in front of the main blade storage portion 2a and the sub blade storage portion 2b of the carriage 2 in the carriage traveling direction (left front side in FIG. 5). Is provided. The guide portion 15 has a sloped portion 16a into which the sheet to be cut is struck on the main blade storage 2a side before the sheet to be cut is cut out.
And the sloped portion 16b that is scooped up from the side of the sub blade storage portion 2b.
And the introduction portion 17 which is a flat slit for guiding the sheet to be cut to the cutting point in a state as flat as possible, the cross section of the funnel is formed. This introduction part 17
Is preferably as narrow as possible within the range that does not hinder the entry of the sheet to be cut.

Further, the side of the sub-blade storing section 2b of the introducing section 17 is
It spreads so as to project in the traveling direction of the sheet to be cut (the direction of the arrow shown in FIG. 5). The inclined portion 16C connected to the introduction portion 17 is inclined from the protrusion toward the base portion in the carriage traveling direction. As shown in FIG. 7, when the sheet to be cut drastically hangs down from the surface of the base 1a, the sloped portion 16b and the inclined portion 16c also dig into the lower side of the sheet to be cut and gradually scoop up to gradually flatten it. It is possible to smoothly guide to the introduction portion 17 while shifting to a state (parallel to the base portion 1a).

The embodiment of FIG. 5 is based on the assumption that the sheet to be cut has a considerable amount of curl, but when the sheet to be cut is relatively flat, for example, as in the example of FIG. There is no problem in the configuration in which the side of the auxiliary blade storage portion 2b of the guide portion 15 does not project in the sheet advancing direction.

At the rear of the traveling direction of the carriage 2, a guiding portion 18 which is an inclined surface extending from the cutting point to the back side across the base portion 1a, and an extruding portion 19 protruding like a canopy.
Is configured. The guide portion 18 is provided to retreat the sheet to be cut that is being cut in the direction of the back surface of the base portion 1a and prevent a cutting failure such as jamming. The guiding unit 18 is
The guide portion 15 is continuous with the main blade storage portion 2a side. The extruding portion 19 is provided in order to prevent an obstacle from being caught in the auxiliary blade 5 when the cut sheet to be cut (hereinafter referred to as a cut piece) falls downward in FIG. In addition, the above-mentioned protrusion of the introduction portion 17 on the side of the auxiliary blade storage portion 2b is
Since it is located above the lowest extruding point of the extruding portion 19, it does not hinder the falling of the cut piece and also does not catch the cut piece when the blade base 2 moves.

Further, as shown in FIG. 9, a wire tensioned by a coil spring is engaged with the carriage 2. This wire is laid over a driving pulley and a driven pulley provided on the frame 1 to transmit a driving force from a driving mechanism including a gear and a motor to the carriage 2 to freely reciprocate the traveling rail portion 1b. Of the transport mechanism. The drive / transport mechanism for reciprocally moving the carriage 2 is a means generally used in the field of the cutter device to which the present invention belongs, and its outline is described in the related art, and therefore its explanation is omitted. Furthermore, it can be sufficiently configured as a manual type cutter by moving the above-mentioned carriage 2 directly by hand without using any of these driving mechanisms or wires, or by moving it in conjunction with a slide lever.

Regarding the cutter mechanism having the above structure,
The cutting operation will be described in detail with reference to FIGS.

First, before the cutting shown in FIG. 9, the carriage 2 stands by at a sliding limit point (hereinafter, referred to as a home position) on the far right side in the longitudinal direction in FIG. In this state, the sheet to be cut (not shown) has been printed by the facsimile or printer and is conveyed onto the base 1a. When the printing of one sheet is completed, a conveyance roller provided in a facsimile, a printer, or the like (not shown) further conveys the sheet to be cut, and stops the sheet when the sheet reaches the cutting position. When the cutting point of the sheet to be cut stops at the cutting position,
The carriage 2 moves to the left front side (hereinafter, referred to as a cutting direction) along the traveling rail portion 1b to start the cutting operation.

Next, as shown in FIG. 10, when the tip of the carriage 2 reaches one end of the sheet to be cut, the guide portion 15 guides the end of the sheet to be cut to the cutting point. Specifically, when the sheet to be cut is curled or the weight of the sheet droops to the back side of the surface of the base 1a, the slope 16a scoops it up. The sheet to be cut is curled (the curl state depends on the installation conditions of the sheet to be cut)
Thus, when it is in a state of being lifted from the surface of the base portion 1a, the slope portion 16b pushes it in. After that, the edge of the sheet to be cut is guided between the introduction portions 17 and guided to the cutting point. The sheet to be cut that has reached the cutting point is cut by the main blade 4 and the sub blade 5.

Next, as shown in FIG. 11, the cutting piece does not cause an obstacle such as jamming, so that the carriage 2
The guide portion 17 provided at the position of the base 1a causes the base portion 1a to be withdrawn from the back surface of the base portion 1a at any time and drops, and is held by a holding means such as a stacker (not shown). Further, the push-out section 19 blocks so that the falling cutting pieces are not caught in the auxiliary blade 5.
In this way, as the carriage 2 moves in the cutting direction, the cutting operation of the sheet to be cut and the retracting operation after cutting continuously proceed.

Finally, as shown in FIG. 12, when the cutting of the sheet to be cut is completed, at that moment, the cut piece falls almost directly below, and the evacuation of the cut piece is completed. After this, the carriage 2
When it reaches the sliding limit point on the left front side in the longitudinal direction (hereinafter referred to as the reverse position), the motor is rotated in the reverse direction to return the carriage 2 from the reverse position to the home position to prepare for the next cutting. The reverse position may be provided immediately after the cut pieces have been retracted. This completes the cutting operation for one sheet. The desired number of sheets can be cut by repeating this operation. As a means for detecting that the carriage 2 has reached the home position and the reverse position, for example, a limit switch is provided in the vicinity of the drive pulley and the driven pulley, and it is detected that the carriage 2 contacts the limit switch. Alternatively, as in the invention disclosed in Japanese Utility Model Publication No. 7-39580, a method is known in which a limit switch for detecting a home position and a reverse position is not provided, and a motor is driven in a forward or reverse direction for a certain period of time for control. Can be used according to conditions and requirements.

[0051]

As described above, the cutter mechanism of the present invention can be constructed without using the fixed blade which is required for the conventional cutter mechanism used for OA equipment and home electric appliances. By omitting the fixed blade, which requires a wide variety of complicated manufacturing processes and high precision, and has a limit in reducing costs, it is possible to realize a cheaper cutter mechanism to be mounted on popular low-cost products. .

Further, since the cutter mechanism of the present invention is a combination of a disk-shaped round blade and a cylindrical round blade, it basically has a "round blade + round blade" type construction,
A "round blade + fixed blade" type structure can be realized microscopically at the cutting point where cutting performance is affected. With this, it is possible to provide a cutter mechanism having cutting performance and durability close to those of the "fixed blade + round blade" type while taking advantage of the "round blade + round blade" type.

Further, in the cutter mechanism of the present invention, when the cutting operation is performed, the guide portion including the two slope portions, the slope portion provided on the lower slope portion, and the slit-shaped introduction portion is passed through to receive the object to be covered. Since the state of the cut sheet can be guided to the cutting point in a stable posture, more stable cutting performance can be obtained. Since the cut sheet that has been cut falls at that moment, an obstacle that occurs during the carriage return operation is prevented, and the space provided in the holding mechanism such as the stocker becomes small.

Further, in the cutter mechanism of the present invention, since the contact state between the main blade and the sub-blade depends only on the manufacturing accuracy inside the carriage, the influence of the carriage moving accuracy and the frame manufacturing accuracy is reduced, and the parts accuracy and Reliance on the assembly process is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a carriage portion in a first embodiment of a cutter mechanism of the present invention.

FIG. 2 is a trihedral view showing a contact state between a main blade and a sub blade in the first embodiment of the cutter mechanism of the present invention.

FIG. 3 is a three-view drawing of a carriage portion in the first embodiment of the cutter mechanism of the present invention.

FIG. 4 is a conceptual diagram showing the opening angle of each of “round blade + round blade” and “round blade + fixed blade”.

FIG. 5 is a perspective view of a carriage portion in the first embodiment of the cutter mechanism of the present invention.

FIG. 6 is an exploded perspective view of a carriage portion in the first embodiment of the cutter mechanism of the present invention.

FIG. 7 is a side view showing a state in which the sheet to be cut hanging from the table surface is guided to a cutting point in the first embodiment of the cutter mechanism of the present invention.

FIG. 8 is a perspective view of a carriage portion in the second embodiment of the cutter mechanism of the present invention.

FIG. 9 is a view showing a state before the cutter mechanism of the present invention cuts a sheet to be cut.

FIG. 10 is a diagram showing a state when the cutter mechanism of the present invention starts to cut a sheet to be cut.

FIG. 11 is a diagram showing a state in which the sheet to be cut is being cut by the cutter mechanism of the present invention.

FIG. 12 is a view showing a state of the cutter mechanism of the present invention immediately after the cutting of the sheet to be cut is completed.

FIG. 13 is a cross-sectional view showing third to fifth embodiments of the cutter mechanism of the present invention.

FIG. 14 is a perspective view showing an example of a conventional “fixed blade + round blade” type cutter mechanism.

FIG. 15 is a perspective view showing an improved example of a conventional “fixed blade + round blade” type cutter mechanism.

FIG. 16 is a perspective view showing an example of a conventional “round blade + auxiliary blade” type cutter mechanism.

FIG. 17 is a perspective view showing an example of a conventional “round blade + round blade” type cutter mechanism.

[Explanation of symbols]

 1 frame 1a base part 1b traveling rail part 2 carriage (blade base) 2a main blade storage part 2b sub blade storage part 3 rail groove 4 main blade 5 sub blade 6 main blade bearing 7 main blade bearing cap 8 lid 9 leaf spring 10 main Rolling wheel 11 Rotating shaft (main blade side) 12 Sub blade bearing 13 Sub rolling wheel 14 Rotating shaft (sub blade side) 15 Guide portion 16a Slope (base surface side) 16b Slope (base back side) 16c Inclined part 17 Introductory part 18 Guide part 19 Extruded part 20 Fixed blade 21 Cutter frame 22 Travel guide part 23 Carriage 24 Sliding holding part 25 Round blade support base 26 Round blade 27 Front raschel part 28 Relief groove 30 Round blade 31 Auxiliary blade 32 Moving body 40 Holder 41 Round blade (fine angle support) 42 Round blade 43 Guide track 44 Connecting part 45 Guide part

Claims (8)

[Claims] 1. A frame provided so as to traverse a sheet-shaped object to be cut, a movement path that traverses the object to be cut, a table part on which the object to be cut is installed, or a table part for assisting conveyance of the object to be cut. And a blade base that is reciprocally movable on the movement path and that straddles an object to be cut, and has a storage portion for the blade on each of the front and back of the object to be cut, and is stored in the blade base so that the blade edges of each overlap. And, rotatably supported on the blade base, a first rotary blade that is a disk-shaped blade having a blade on the peripheral edge and a second rotary blade that is a cylindrical blade having a blade at one end of the outer peripheral edge, Energizing means for pressing the blade edge of the first rotary blade against the blade edge of the second rotary blade with a predetermined pressure, and imparting rotation of a constant cycle in conjunction with the movement of the blade base to at least one of the rotary blades. , The first rotary blade and the second rotary blade are opposite to each other And a rolling mechanism that rotates at a constant cycle. 2. The first rotary blade is provided in the storage section on the side of the workpiece on which the blade section of the blade base is installed, and the second rotary blade is provided in the other storage section of the blade base. The cutter mechanism according to claim 1, wherein a cross contact point of the first rotary blade and the second rotary blade substantially coincides with an object installation surface of the base portion. 3. The second rotary blade is a hollow cylindrical blade having a blade at one end of an outer peripheral edge thereof.
And the cutter mechanism according to claim 2. 4. A guide part for guiding the cut object to the contact point of the first rotary blade and the second rotary blade before cutting the cut object on the blade stand, and a separation piece of the cut object being cut. The cutter mechanism according to any one of claims 1 to 3, further comprising: 5. The first slanted surface, wherein the guide portion holds down the floating of the cut object from the base portion, the second slanted surface that scoops down the hanging of the cut object from the base portion, and the first and second The cutter mechanism according to claim 4, wherein the second inclined surface is composed of flat portions which are continuous in a funnel cross section and have minute intervals, and converge toward the contact points of the first and second rotary blades. . 6. A flat portion, which extends so as to project toward the separated side of an object to be cut, and which is continuous with the second inclined surface in a funnel cross-sectional shape, and when the second inclined surface is cut from a tip of the flat portion. The cutter mechanism according to claim 5, further comprising an inclined portion that is inclined from the separated side of the cut object toward the base side toward the starting point on the blade stand moving direction side. 7. The second rotary blade axially supported so that the blade edge surface is parallel to the blade holder advancing direction at the time of cutting, and is inclined at a predetermined angle with respect to the blade edge surface of the second rotary blade. 7. The cutter mechanism according to claim 1, further comprising: the first rotary blade pivotally supported by the first rotary blade. 8. The cutter mechanism according to claim 1, further comprising a drive / transport mechanism for reciprocating the blade base along the movement path.