JPH1199716A - Cutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a cutter device and improve durability thereof by providing a grinding member disposed almost in parallel with a fixed blade and sliding on a face being in contact with the fixed blade of a rotating blade at the time of returning process of a cutter stand. SOLUTION: A driving pulley 34 is rotated in the arrow mark direction through an intermediate gear geared with a motor gear 32 and a cutter guide 40 is moved in the arrow mark A direction through a cutter driving belt 36 and a guide shaft 3. A rotating blade 2 is moved while rolling on a fixed blade 21 and also moved while cutting a recording paper 25 by its edge. The rotation torque applied to the rotating blade 2 at the time of returning the cutter guide 10 is generated by the friction with a grinding section 23 and also the friction by an O-ring 8 with a wall section 30, and the torque generated by the friction of the O-ring 8 of high friction coefficient is large, and as the outer diameter of the O-ring 8 is smaller than the outer diameter of the rotating blade 2, the rotting blade 2 is moved while rolling on the grinding section 23. The worn sections of the back face of the rotating blade 20, therefore, are ground by the grinding section 23 at the time of returning a cutter stand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium cutter for cutting recorded roll paper used in a facsimile or a printer.

[0002]

2. Description of the Related Art Conventionally, a typical technique of this kind is disclosed in Japanese Utility Model Laid-Open No. 3-4.
As in 4590, a cutter for cutting roll paper by rotating a rotary blade pressed against a fixed blade and moving in a cutting direction while rotating has been used in a facsimile or the like.

[0003]

However, in the above-mentioned prior art, since the small rotary blade cuts while rotating,
As shown in FIG. 5, the cutting edge 2a of the rotary blade 2 was worn and rounded, and the sharpness was likely to be poor. As a result, the recording paper is sandwiched between the rotary blade 2 and the fixed blade 21 without being cut, so that the function as a cutter cannot be performed, and a paper jam or the like is induced to reduce the reliability of the entire device incorporating the cutter device. Had been lowered. In particular, since the equipment is required to be downsized, the outer diameter of the rotary blade 2 tends to be small,
Durability has become a major issue as it gets smaller.

SUMMARY OF THE INVENTION The present invention has been made to solve such a drawback, and it is an object of the present invention to provide a compact recording paper cutter device having improved durability.

[0005]

In order to solve the above-mentioned problems, a recording medium cutter according to the present invention comprises a fixed blade capable of contacting the front or back surface of a recording medium at an exit of a recording medium conveyance path. A recording medium cutter device comprising: a fixed blade and a tool rest rotatably supporting a disk-shaped rotary blade having a blade formed around the opposite side of the conveyance path, and a reciprocating blade along the fixed blade. A rotary blade contacting / separating means for moving the rotary blade to a close position where the blade of the rotary blade comes into contact with the fixed blade during the forward process of the tool post, and a retracted position to retreat from the fixed blade during the return process; It is characterized in that it has a polishing member that is arranged in parallel and slides on a surface that comes into contact with the fixed blade of the rotary blade when the tool rest is returned to the process.

According to the above construction, the rotary blade slides on the polishing member and is polished during the return process, so that the cutting quality of the rotary blade is maintained without deterioration.

Further, the cutter device is characterized in that the cutter device is provided with rotary blade driving means for rotating the rotary blade at the time of returning the tool post.

According to the above configuration, since the polishing member rotates and slides, the cutting edge is uniformly polished without uneven wear.

Further, the rotary blade driving means comprises: a rotary driving member disposed substantially parallel to the fixed blade on a frame of the cutter device;
A rotary driven member formed on the rotation center axis of the rotary blade with an outer diameter smaller than the outer diameter of the rotary blade and engaged with the rotary blade rotary drive member.

According to the above configuration, since the rotary blade rotation driven member is smaller than the outer diameter of the rotary blade, the rotary blade is rotated more than the number of revolutions at which it rotates. As a result, it slides with the polishing member, so that it is reliably polished.

Further, the rotary blade rotary driving member is a wall portion of the polishing member, and the rotary blade driven member is formed of a roller formed with a high friction coefficient and arranged on the rotation center axis of the rotary blade. It can be achieved with a simple mechanism, and is inexpensive and compact.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a top view showing an embodiment of the present invention, FIG. 2 is an explanatory front view, FIG. 3 is an explanatory side view thereof, and FIG. 4 is an explanatory view of a cutting edge of a rotary blade.

Reference numeral 1 denotes a cutter device disposed above a printing unit of the printer, which sandwiches a paper passage opening 26 provided on a paper path of a recording paper 25 as a recording medium, and has a paper passage opening 26 on one side. Fixed blade 21 arranged in parallel with
The cutter guide 10 has the rotary blade 2 abutting on the fixed blade 21 and is movably supported by supporting shafts 13 and 14 arranged in parallel with the fixed blade 21.

Reference numeral 36 denotes a cutter drive belt of a timing belt having an irregular inner surface, and is suspended around a drive pulley 34 and a driven pulley 35 rotatably supported by the cutter frame 27. The driving pulley 34 and the driven pulley are provided with wheels around which teeth that mesh with the teeth on the inner peripheral side of the cutter driving belt 36 are formed. And are rotationally driven.

The pitch circle diameter of the cutter drive belt 36 is formed to be an integral multiple of the pitch circle diameter of the drive pulley 34 and the driven pulley 35, and predetermined teeth of the cutter drive belt 36 are formed by the drive pulley 34 and the driven pulley 35. Meshes with the predetermined teeth.

The guide shaft 3 is fixed to the cutter driving belt 36, and the wheels of the driving pulley 34 and the driven pulley 35 have flanges for restricting the cutter driving belt 36 from moving up and down so as not to come off. The flange portion has a groove-shaped relief portion at a position corresponding to the guide shaft 3 so as not to contact the guide shaft 3. Therefore, the cutter drive belt 36 to which the guide shaft 3 is fixed is
The driving pulley 34 and the driven pulley 35 rotate without receiving a load.

The rotary blade 2 has a sleeve 4 rotatably formed with respect to the guide shaft 3 (see FIG. 3) and is supported by the guide shaft 3. When the cutter guide 10 is moved in the direction of arrow A, it is located on the fixed blade 21 side, and when the guide shaft 3 rotates around the drive pulley 34 and is located on the side far from the fixed blade 21, the details will be described later. However, the rotary blade 2 is configured to be movable in the cutter guide 10.

Reference numeral 23 denotes a polishing portion which abuts and slides when the rotary blade 2 moves away from the fixed blade 21 and moves in a direction opposite to the arrow A. In this embodiment, the polishing portion 23 is formed of a steel plate. The bent cutter frame 27 is formed by bending.

A wall portion 30 is formed between the driving pulley 34 and the driven pulley 35 so as to protrude upward from the cutter frame 27 in parallel with the fixed blade 21, and the O-ring 8 disposed below the guide shaft 3 is pressed into contact therewith. It is configured to be.

Further, the cutter frame 27 is formed with a position restricting portion 28 and an inclination preventing portion 29 having a predetermined width and a different height from the position restricting portion 28.

The driving pulley 3 of the cutter frame 27
A home position detector (not shown) having a terminal that is moved by the cutter guide 10 is disposed on the fourth side.
Further, an intermediate gear that meshes with the drive pulley 34 and the motor gear 32 and transmits the rotational power of the motor 31 is provided.

Referring to FIG. 3, the main part of the cutter will be described in detail.

The rotary blade 2 is rotatably supported on a guide shaft 3 fixed to a cutter drive belt 36 with pins or the like, and has a pressing spring 6 whose one end is locked by a push nut 5.
Urged downwards. The cutter guide 10
It can be separated into upper and lower bodies, and is integrally assembled by a latch method (not shown). An upper groove 12 of a long groove is formed in an upper portion of the cutter guide 10 in a direction orthogonal to the fixed blade 21, and a lower groove 11 is formed in a lower portion of the cutter guide at a position facing the upper groove 12. The width of the upper groove 12 and the lower groove 13 is formed slightly larger than the outer diameter of the guide shaft 3, and the guide shaft 3 does not play in the moving direction of the cutter guide 10 by the upper groove 12 and the lower groove 11, and
It is mounted so as to be movable in a direction perpendicular to the fixed blade 21.

The fixed blade 21 is formed to have a blade angle θ, the rotary blade 2 is pressed against the tip, and the polishing section 23 is configured to slide on the rotary blade 2 in a plane.

Next, the operation of the above mechanism will be described in detail step by step.

The case where the printer is mounted on a printer (not shown) will be described in detail. When the printer power is input, first check whether the home position detector is turned on, and only when the home position detector is on, which indicates that the cutter guide 10 is at the standby position,
The recording paper 25 printed and printed by a printer (not shown) is conveyed through a paper passage opening 26 of the cutter device 1 arranged on the paper path. When the desired printing is completed, a cutter command is input after a predetermined amount of paper has been fed by the distance from the printing unit to the cutter.

When the motor 31 is rotated in the direction of the arrow by the cutter command, the drive pulley 34 is rotated in the direction of the arrow via the intermediate gear meshing with the motor gear 32, and the cutter guide 10 is driven by the cutter driving belt. 36, move in the direction of arrow A via the guide shaft 3. The rotary blade 2 includes a fixed blade 21
It moves while rolling on the top, and moves while cutting the recording paper 25 at the cutting edge.

At the time of cutting, the rotary blade 2 is caused to move backward by the recording paper 25,
And the inclination preventing portion 29 prevents the guide shaft 3 from falling off the fixed blade 21 so that the rotary blade 2 and the fixed blade 21
Keep in contact.

When the cutting of the recording paper 25 is completed, the guide shaft 3 is disengaged from the position restricting portion 28 and the inclination preventing portion 29 and moves along the outer periphery of the driven pulley 35.
Separated from Since the guide shaft 3 is moved in a direction orthogonal to the fixed blade 21, the guide shaft 3 slides and moves in the upper groove 12 and the lower groove 11 of the cutter guide 10, and the moving direction is changed.

Further, when the motor 31 rotates in the same direction,
The guide shaft 3 moves from the driven pulley 35 to the drive pulley 34 side. At this time, the rotary blade 2 comes into contact with the polishing portion 23 and
The ring presses against the wall 30.

Accordingly, the rotating torque applied to the rotary blade 2 during the returning process of the cutter guide 10 is caused by the friction with the polishing portion 23 and the rotating torque by the O-ring 8 and the wall portion 30. O-ring 8 with high friction coefficient
And the outer diameter of the O-ring 8 is smaller than the outer diameter of the rotary blade 2.
Moves while rotating on the polishing section 23.

When the rotary blade 2 approaches the drive pulley 34, the engagement between the polishing portion 23 and the wall 30 is released, and the drive pulley 34
By means of the guide shaft 3, the upper groove 12 of the cutter guide 10,
And the lower groove 11 is slid, and the conversion of the moving direction is completed.

When the cutter guide 10 approaches the drive pulley 34, the home position detector turns on the cutter guide 10.
And comes into an on state. Even if the home position detector 38 is turned on, since the guide shaft 3 is in the process of changing its moving direction, after a predetermined time has elapsed after the home position detector 38 is turned on, the motor 2
Is stopped. The cutting process in the cutter device 1 ends.

The durability of the rotary blade 2 used in the cutting device having such a configuration will be described with reference to FIG.
The function of the rotary blade 2 to cut the recording paper 25 in cooperation with the fixed blade 21 is the same as the conventional one, and the blade tip 2a wears and the blade tip 2a becomes round as in the conventional technique. In the returning step, the back surface of the rotary blade 2 is worn by the polishing portion 23 so that the worn portion 2
Is polished. As a result, the cutting edge 2b is always sharp, and the sharpness does not decrease.

In the present embodiment, the polishing portion is formed by bending and raising the cutter frame. However, a polishing member mixed with a powder diamond may be disposed on the cutter frame.

[0036]

As described above, according to the cutter device of the present invention, the fixed blade capable of contacting the front or back surface of the recording medium at the outlet of the recording medium conveyance path, and the fixed blade form the conveyance path. In a recording medium cutter device having a disk-shaped rotary blade rotatably supporting a disk-shaped rotary blade having a blade formed on the opposite side on the opposite side thereof, and a tool rest reciprocating along a fixed blade, in the forward process of the tool rest, A rotary blade contacting / separating means for moving the rotary blade to a proximity position where the blade of the rotary blade abuts the fixed blade, and a retreat position for retreating from the fixed blade during the return process; Since the rotating blade has a surface that comes into contact with the fixed blade of the rotary blade during the return process and the polishing member that slides, the rotary blade slides on the polishing member and is polished during the return process, so the cutting quality of the rotary blade is reduced. Is sustained without

According to the second to fourth aspects of the present invention, the blade is reliably slid and rotated by the polishing member, so that the cutting edge is uniformly polished without uneven wear. Miniaturization is achieved. As described above, the practical effect of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a top view illustrating one embodiment of the present invention.

FIG. 2 is an explanatory front view showing the embodiment of the present invention.

FIG. 3 is an explanatory side view showing one embodiment of the present invention.

FIG. 4 is an explanatory view of a tip of a rotary blade according to the present invention.

FIG. 5 is an enlarged view of the tip of a rotary blade according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter apparatus 2 Rotating blade 2a Blade tip 3 Guide shaft 4 Sleeve 5 Spring holding 6 Pressing spring 8 O-ring 10 Cutter guide 21 Fixed blade 23 Polishing part 27 Cutter frame 30 Wall part 34 Drive pulley 35 Follower pulley 36 Cutter drive belt

Claims (4)

[Claims] A fixed blade which can be brought into contact with the front or back surface of the recording medium at an exit portion of a recording medium transport path; and a blade formed around the opposite side of the fixed blade with respect to the transport path. And a tool rest rotatably supporting the disc-shaped rotary blade and reciprocating along the fixed blade. The cutter device for the recording medium, wherein the blade of the rotary blade at the time of forward movement of the tool rest. A rotary blade contacting / separating means for moving the rotary blade to a proximity position where the rotary blade is brought into contact with the fixed blade, and a retreat position where the rotary blade is retracted from the fixed blade in a return process; And a polishing member that slides on a surface of the rotary blade that comes into contact with the fixed blade during the returning step. 2. The cutter device according to claim 1, wherein the cutter device includes a rotary blade driving unit that rotates the rotary blade when the tool post is returned. 3. The rotary blade driving means includes: a rotary driving member disposed on the frame of the cutter device in substantially parallel with the fixed blade; and a rotary blade having a diameter smaller than an outer diameter of the rotary blade on a rotation center axis of the rotary blade. 3. The cutter device according to claim 2, further comprising a rotary driven member formed with an outer diameter and engaged with the rotary blade rotary drive member. 4. The rotary blade rotation driving member is a wall portion of the polishing member, and the rotary blade driven member is a roller formed with a high friction coefficient and arranged on a rotation center axis of the rotary blade. The cutter device according to claim 3, wherein the cutter device is provided.