JP3767640B2 - Auto cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to use of a recording medium disposed in a printing apparatus or the like, and more particularly to a cutter mechanism that automatically cuts receipt paper of a printing apparatus.
[0002]
[Prior art]
Conventionally, an auto cutter that has driven a cutter blade using a motor as a drive source, for example, when foreign matter enters the movement range of the cutter blade and prevents the cutter blade from moving, the motor stops and the cutter blade is damaged. It was a mechanism to prevent.
[0003]
[Problems to be solved by the invention]
In the auto cutter as described above, the motor stops in order to prevent the cutter blade from being damaged, but it can be realized by strictly controlling the torque of the motor. As a result, management costs and parts prices increased, resulting in increased costs. Furthermore, the standard for producing motors is strict, resulting in poor yield and reduced productivity.
[0004]
Also, even if the motor torque can be managed properly, when used in an area where the voltage varies severely, especially if a voltage exceeding the standard is applied, the motor will not stop and the cutter blade will be damaged, resulting in a service call. Had occurred.
[0005]
Furthermore, with this mechanism, the motor is suddenly stopped, and the gear train that drives the cutter blade must be thickened so that it will not be damaged even if it is subjected to inertia, so it cannot be reduced in size. It was.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to prevent the cutter blade from being damaged by a simple mechanism, and to provide an auto cutter that is smaller, cheaper, and improved in reliability by downsizing and simple control.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an automatic cutter for cutting a continuous recording medium to a desired length, a cutter blade disposed so as to be movable along a regulated movement path, and a cutter frame. Driven by a motor, a swing lever that is swingably attached and engages with the cutter blade, a biasing member that biases the swing lever in a predetermined direction so as to suppress movement of the swing lever, When the cutter blade cuts the recording medium, the swing lever is rotated so that a component force for moving the cutter blade and a component force for moving the swing lever against the biasing member are obtained. A worm wheel with an oscillating lever driving pin implanted therein ,
The engagement portion between the cutter blade and the swing lever is a first engagement portion that is integrally engaged so as to move in the moving direction of the cutter blade, and the swing portion when the swing lever moves. A second engaging portion is provided that is relatively movable so that only the lever approaches the recording medium.
[0008]
With the above configuration, when the movement of the cutter blade is restricted, the swing lever moves due to the component force. Therefore, the engagement portion between the cutter blade and the swing lever engages with the second engagement portion and swings. Since only the lever moves, the oscillating lever can oscillate, and the motor does not lock.
[0009]
In addition, the engaging portion has a shaft-shaped cutter blade drive pin disposed on one of the cutter blade and the swing lever, and the other has an L-shaped groove or hole in which the cutter blade drive pin slides. It is characterized by being.
[0010]
If it is set as the said structure, it will become possible to achieve the said subject efficiently.
[0011]
Further, the cutter blade has a rectangular shape, and the cutter frame is characterized in that convex portions are provided on both side surfaces of the cutter blade so that the lateral end surfaces of the cutter blade come into contact with each other.
[0012]
According to the above configuration, since the cutter blade is regulated by the convex portions on both sides, the cutter blade moves substantially in parallel without rotating and improves its straightness.
[0013]
Furthermore, the cutter blade is biased to the cutter frame by a pressing spring.
[0014]
According to the above configuration, since the cutter blade does not lift from the sliding surface of the cutter frame, it does not come off from the convex portion, and further, the height of the convex portion is reduced so that the cutter frame can be easily processed. The application range is widened.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 1 is a top view of a printing apparatus used in a cash register equipped with an auto cutter according to an embodiment of the present invention.
[0016]
Reference numeral 1 is a receipt paper, 2 is a journal paper printed for storing records, 3 is a print head, 4 is a ribbon cassette, 5 is a cutter blade pressing plate, and 6 is a cutter blade receiving plate.
[0017]
The details of the auto cutter unit will be described below. 2, 3, 4, 5, and 6 are detailed explanatory views of an auto-cutter mechanism showing an embodiment of the present invention. FIGS. 2, 3, and 4 are perspective views, FIGS. 6 is a top view.
[0018]
As shown in FIG. 2, the output shaft of the cutter drive source 7, which is a high torque type motor, rotates the worm wheel 10 in which the swing lever drive pin 9 is implanted via the gear train 8.
[0019]
As shown in FIG. 3, the swing lever driving pin 9 is engaged with a guide hole 12 formed in the swing lever 11, and the swing lever 11 is pivoted according to the rotation of the worm wheel 10. It swings around the shaft 13.
[0020]
As shown in FIG. 4, the cutter blade drive pin 14 projecting from the tip of the swing lever 11 is provided in the cutter blade receiving plate 6 through a square hole 15 formed in the cutter blade receiving plate 6. The cutter blade 17 is fitted into the engagement hole 18 of the cutter blade 17 placed between the two convex portions 16, and the swing operation of the swing lever 11 is performed via the cutter blade drive pin 14. Make the advancing and retreating movements.
[0021]
The convex portion 16 of the cutter receiving plate 6 is formed by a half blank of the cutter receiving plate 6, and the end surface on the cutter blade 17 side is formed substantially perpendicular to the sliding surface f of the cutter blade 17.
[0022]
On the cutter blade receiving plate 6, a cutter blade pressing plate 5 is provided so as to cover the cutter blade 17. A pressing spring 26 of a leaf spring is fixed to the cutter blade pressing plate 5 so as to urge the cutter blade 17 to the sliding surface of the cutter receiving plate 16.
[0023]
Accordingly, the cutter blade 17 is guided by the convex portion 16 on both sides, and the cutter blade receiving plate 6 passes through the plate-shaped gap between the cutter blade receiving plate 6 and the cutter blade pressing plate 5 according to the swinging motion of the swing lever 11. And, the cutting blade 19 is moved forward and backward in the direction orthogonal to the insertion hole 19 provided in the presser plate 5, and cuts the receipt paper 1 by moving forward and backward in the direction orthogonal to the surface of the receipt paper 1 inserted through both insertion holes 19 and restricted in movement. To do.
[0024]
As shown in FIGS. 3 and 4, the swing center hole 20 formed on the swing center side of the swing lever 11 is inserted into the swing center shaft 13 projecting from the support frame 21 to support the swing lever 11. The swing lever 11 is pulled in the direction of arrow a by a spring 24 attached between a spring hook shaft 22 protruding from the frame 21 and a spring hook portion 23 provided on the swing lever 11, and the swing center hole 20. Is in contact with the oscillation center shaft 13.
[0025]
The above is the description of the operation of the embodiment of the auto cutter according to the present invention.
[0026]
In the auto cutter, a case where a foreign object 25 such as a clip is inserted into the paper insertion hole 19 provided in the cutter blade receiving plate 6 and the cutter blade holding plate 5 will be described with reference to FIGS. 5 and 6.
[0027]
The cutter blade 17 is obstructed by the foreign matter 25 and stopped by the foreign matter 25.
The swinging motion of the cutter blade drive pin 14 fitted in the first engagement portion d of the engagement hole 18 is also stopped.
[0028]
However, since the cutter drive source 7 continues to rotate the output shaft thereafter, the rotational movement of the swing lever drive pin 9 is continued.
[0029]
Next, the oscillating lever 11 starts to move in the direction of the arrow b in a state where the cutter blade driving pin 14 is in contact with the engagement hole 18 of the cutter blade 17 by the rotational movement of the oscillating lever driving pin 9. From the time when the drive pin 14 enters the second engagement portion c formed in the forward / backward direction of the cutter blade in the engagement hole 18 of the cutter blade 17, the swing center is further moved by the swing lever drive pin 9. In this state, the swinging motion is resumed.
[0030]
In this case, the swing lever 11 is swung, but the cutter blade drive pin 14 is provided in the same direction as the moving direction of the blade disposed on the cutter blade 17 and moves through the engagement hole. do not do.
[0031]
After that, when the cutter blade enters the return stroke, the swing lever 11 swings in the opposite direction, but the cutter blade drive pin 14 is engaged until it reaches the hole of the engagement hole 18 in the width direction of the cutter blade 17. The hole in the traveling direction of the joint hole 18 is moved.
[0032]
Since the fulcrum portion of the swing lever 11 is biased by the spring 24 in the direction of the cutter blade 17, when the cutter blade drive pin 14 reaches the hole portion of the engagement hole 18 in the width direction of the cutter blade 17, The blade drive pin 14 moves to the hole in the width direction, and the cutter blade drive pin 14 enters the portion d of the engagement hole 18 with the cutter blade 17 stopped by the swinging motion of the swing lever 11, and swings. The moving lever 11 is returned to the position when the cutter blade 17 is stopped by the foreign matter 25 by the spring 24. Further, the cutter blade 17 is returned to the position at the start of the operation and stopped. The operator estimates the cause of the failure such as foreign matter entering due to the abnormality that the receipt paper 1 is not cut, and if the foreign matter 25 is removed by checking to remove the foreign matter 25, then the normal receipt paper 1 can be cut.
[0033]
Further, when the cutter blade 17 is stopped by the foreign matter or the like, the cutter blade 17 is biased by the spring 24 to the end surface of the e-side convex portion 16 provided on the cutter blade receiving plate 6 via the swing lever 11. However, since the end face is formed perpendicular to the sliding surface f and the cutter blade 17 is urged to the sliding surface f by the holding spring 26, the cutter blade 17 is lifted. It does not enter the gap with the cutter blade pressing plate 5.
[0034]
Further, since the cutter blade 17 does not enter the gap during the normal movement of the cutter blade 17, the cutter blade 17 is moved to the f surface of the cutter blade receiving plate 6 by the presser spring 26 joined to the cutter blade presser plate 5. Abut.
[0035]
Further, since the cutter blade 17 is urged against the sliding surface f by the holding spring 26, when the receipt paper 1 is cut, the regulation portion g portion of the paper insertion hole 19 of the cutter blade receiving plate 6 and the cutter blade 17 are separated. The gap in the height direction is not widened, and as a result, there is no cutting defect where the receipt paper 1 is bent between the regulating portion g and the cutter blade 17, and the cutting quality is improved.
[0036]
In this embodiment, the pin is disposed on the swing lever, and the cutter blade is provided with the L-shaped hole. However, the shaft blade is disposed on the cutter blade, and the swing lever is L-shaped. The effect can be obtained in the same way even if the pin is arranged.
[0037]
【The invention's effect】
As described above, according to the present invention, in an automatic cutter that cuts a continuous recording medium to a desired length, a cutter blade that is movably disposed along a restricted movement path, Driven by a motor, a swing lever that is swingably attached and engages with the cutter blade, a biasing member that biases the swing lever in a predetermined direction so as to suppress movement of the swing lever, When the cutter blade cuts the recording medium, the swing lever is rotated so that a component force for moving the cutter blade and a component force for moving the swing lever against the biasing member are obtained. A worm wheel with an oscillating lever driving pin implanted therein ,
The engagement portion between the cutter blade and the swing lever is a first engagement portion that is integrally engaged so as to move in the moving direction of the cutter blade, and the swing portion when the swing lever moves. By providing the second engaging portion that can be relatively moved so that only the lever approaches the recording medium side, when the cutter blade is restricted from moving, the swing lever moves by a component force. Since the engaging portion of the swing lever engages with the second engagement portion and only the swing lever moves, the swing lever can swing and does not cause a phenomenon that the motor locks. Furthermore, since the fulcrum portion only needs to be moved, space can be saved and the overall size of the mechanism can be reduced.
[0038]
In addition, the engaging portion has a shaft-shaped cutter blade drive pin disposed on one of the cutter blade and the swing lever, and the other has an L-shaped groove or hole in which the cutter blade drive pin slides. As a result, the above-mentioned problem can be achieved efficiently.
[0039]
Furthermore, the cutter blade has a rectangular shape, and the cutter frame is provided with convex portions that come into contact with the lateral end surfaces of the cutter blade on both sides of the cutter blade. It moves substantially in parallel without rotating and its straightness is improved.
[0040]
Furthermore, since the cutter blade is urged against the cutter frame by the holding spring, the cutter blade does not lift from the sliding surface of the cutter frame, so it does not come off from the convex part. There is an effect of widening the application range such that the height of the convex portion can be reduced so that the frame can be easily processed, and the practical effect of the present application is extremely large.
[Brief description of the drawings]
FIG. 1 is a top view of a printing apparatus equipped with an auto cutter according to an embodiment of the present invention.
FIG. 2 is a perspective view of an auto cutter according to an embodiment of the present invention.
FIG. 3 is a perspective view of an auto cutter according to an embodiment of the present invention.
FIG. 4 is a perspective view of an auto cutter according to an embodiment of the present invention.
FIG. 5 is a top view for explaining an operation when a foreign object 25 enters a paper insertion hole 19 of a cutter blade receiving plate 6 during an auto cutter operation according to an embodiment of the present invention.
6 is a top view for explaining the operation when a foreign object 25 enters the paper insertion hole 19 of the cutter blade receiving plate 6 during the auto cutter operation according to an embodiment of the present invention. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receipt paper 2 Journal paper 5 Cutter blade pressing plate 6 Cutter blade receiving plate 7 Cutter drive source 9 Oscillation lever drive pin 10 Worm wheel 11 Oscillation lever 12 Guide hole 13 Oscillation center shaft 14 Cutter blade drive pin 15 Square hole 16 Convex portion 17 Cutter blade 18 Engagement hole 19 Paper insertion hole 20 Oscillation center hole 21 Support frame 22 Spring hook shaft 23 Spring hook portion 24 Spring 26 Presser spring

Claims (4)

In an auto cutter that cuts a continuous recording medium to a desired length,
A cutter blade arranged to be movable along a restricted movement path;
A swing lever attached to the cutter frame so as to be movable and swingable, and engaging with the cutter blade;
A biasing member that biases the swing lever in a predetermined direction so as to suppress movement of the swing lever;
Driven by a motor, when the cutter blade cuts the recording medium, the swinging force is obtained so as to obtain a component force for moving the cutter blade and a component force for moving the swing lever against the biasing member. A worm wheel having a swing lever drive pin that rotates a moving lever,
The engagement portion between the cutter blade and the swing lever is a first engagement portion that is integrally engaged so as to move in the moving direction of the cutter blade, and the swing portion when the swing lever moves. An auto-cutter comprising a second engaging portion that can be relatively moved so that only the lever approaches the recording medium side.   The engaging portion has a shaft-shaped cutter blade drive pin disposed on one of the cutter blade and the swing lever, and an L-shaped groove or hole in which the cutter blade drive pin slides is formed on the other. The auto cutter according to claim 1, wherein the auto cutter is provided.   3. The auto cutter according to claim 2, wherein the cutter blade has a rectangular shape, and the cutter frame includes convex portions with which the lateral end surfaces of the cutter blade come into contact with both side surfaces of the cutter blade.   4. The auto cutter according to claim 3, wherein the cutter blade is urged against the cutter frame by a pressing spring.

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