JPH05337875A - Automatic cutter device - Google Patents

Abstract

PURPOSE:To reduce pressure contact force at the going time of a movable blade by forming opening parts in the specified positions of a cutter frame in a device for cutting sheets by the shearing action of a fixed blade and the movable blade held in the pressed state by a keep plate together with the cutter frame. CONSTITUTION:In an automatic cutter device integrated into various kinds of equipment such as a small printer for performing the issue of documents and the like, an oscillating lever 21 is oscillated by rotating a worm wheel 19 by a driving motor 15 to put a movable blade 11 in rectilinear motion along a slide groove 36 together with a slider 35, and a sheet is cut by shearing action between the movable blade 11 and a fixed blade 9. The movable blade 11 is pressed with the specified pressure contact force toward a cutter frame 3 by a keep plate 31. In such a device, bilaterally symmetrical opening parts 101, 101 of inverted trapezoidal shape are formed at a cutter frame 3. At the going time of the movable blade 11, the pressure contact force applied to the movable blade 11 by the keep plate 31 and cutter frame 3 is thereby reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic cutter device used by being incorporated in various devices such as a small-sized printer for issuing forms, and more particularly, to pressure contact when a blade moves forward during a cutting operation. The present invention relates to a device devised to suppress an abnormal increase in force.

[0002]

2. Description of the Related Art An automatic cutter device, which is used by being incorporated into various devices such as a small-sized printer for issuing forms, has a structure as shown in FIGS. 8 to 12, for example. First, there is a cutter cover 1 as shown in FIG. 9, and below the cutter cover 1, a cutter frame 3 as shown in FIG. 8 is installed. The cutter cover 1 shown in FIG. 9 is integrated with the cutter frame 3 shown in FIG. A side wall 4 is provided upright on three sides of the cutter frame 3. The cutter frame 3 is provided with a sheet introduction port 5 into which a sheet (not shown) that has been subjected to predetermined printing by a printer body (not shown) is introduced, and the sheet that has been cut is discharged to the cutter cover 1. A paper discharge port 7 is formed. The paper discharge port 7 has a simple rectangular shape as is apparent from FIG.

A fixed blade 9 is fixed on the cutter frame 3 side and above the paper inlet 5 in FIG. on the other hand,
A movable blade 11 is arranged below the sheet introduction port 5 in FIG. 8, and the movable blade 11 is attached by a drive means 13 so as to be capable of reciprocating in the vertical direction in FIG. The structure of the driving means 13 will be described below. First, the drive motor 15 is installed, and the worm gear 17 is fixed to the rotary shaft of the drive motor 15. A worm wheel 19 is arranged, and the worm wheel 19 meshes with the worm gear 17. The drive motor 15, worm gear 17, and worm wheel 19 are
It is attached to the cutter cover 1 side, and
In FIG. 2, it is shown by a virtual line. Further, the cutter cover 1 is notched in the mounting portion of the drive motor 15 to form an opening 20.

On the other hand, a swing lever 21 is mounted on the cutter frame 3 so as to swing around a fulcrum 23. A cam groove 25 is formed on the right side portion of the swing lever 21 in FIG. 8, and the cam groove 25 is provided in the cam groove 25 so as to project from the lower end surface of the worm wheel 19, as shown in FIGS. The cam pin 27 is movably engaged.
Further, another groove 29 is formed at the center of the swing lever 21. Further, below the swing lever 21, the pressing plate 3
1, a slider 35 and a stop plate 37 are arranged, and the pressing plate 31, the slider 35, and the stop plate 37 are screw members 33,
It is integrated by 34.

The mounting structure of the pressing plate 31, the slider 35, the stopper plate 37, and the movable blade 11 already described will be described in more detail. First, in the central portion of the cutter frame 3, as shown in FIGS. 8, 11, and 12, a rectangular slide groove 36 formed by extending in the reciprocating direction of the movable blade 11 is formed. The slider 35 is slidably fitted in the slide groove 36. or,
As shown in FIG. 12, the movable blade 11 is mounted on the slider 35 via the sliding sheet 38, and the pressing plate 31 is further mounted thereon. On the other hand, slider 3
The stopper plate 3 is provided below the stopper plate 5 via another sliding sheet 40.
7 is installed. In that state, they are screwed and coupled by the screw members 33 and 34 already described. Thereby, the pressing plate 31, the movable blade 11, and the sliding sheet 3 are arranged from above.
8, the slider 35, the sliding sheet 40, and the stop plate 37 are laminated and fixed in this order. The pressing plate 31 and the movable blade 11 are stacked in a state as shown in FIG. .. Further, the stopper plate 37, the sliding sheet 40, and the slider 35 are stacked in the state shown in the rear view of FIG. The upper portion of the screw member 33 is projected upward and is movably engaged with the groove 29 of the swing lever 21. In addition, as shown in FIG.
A concave portion 42 is formed at the tip of the plate, and the pressing plate 31 in that portion is crimped (the crimped portion is indicated by reference numeral 44).

According to the above construction, when the drive motor 15 rotates, the worm wheel 19 rotates through the worm gear 17 in the counterclockwise direction in FIG. 8 (direction indicated by arrow a in the figure). As the worm wheel 19 rotates, the swing lever 21 swings in the forward direction (counterclockwise in FIG. 8, indicated by arrow b in the figure). Thereby,
The pressing plate 31 and the movable blade 1 through the upper portion of the screw member 33.
1, sliding sheet 38, slider 35, sliding sheet 4
0, the stop plate 37 moves linearly along the slide groove 36 in the forward direction. That is, the rotational movement of the drive motor 19 is converted into the linear movement along the slide groove 36. As a result, the movable blade 11 and the fixed blade 9 perform a shearing operation to cut the sheet. Further, when the worm wheel 19 makes a half turn from the state shown in FIG. 8 and makes a further half turn, the swing lever 21 swings in the backward movement direction (clockwise direction in FIG. 1), which causes the pressing plate. 31, movable blade 11, sliding sheet 38, slider 3
5, the sliding sheet 40, and the stop plate 37 also linearly move in the backward movement direction along the slide groove 36 and return to the original position. This completes one cutting operation.

[0007]

According to the above conventional structure, there are the following problems. As described above, the movable blade 11 is fixed by the pressing plate 31 while being pressed in the direction of the cutter frame 3 with a predetermined pressure contact force, and as shown in FIGS. Since the front end portion and both end portions are overlapped with each other on the fixed blade 9, they are set in an ascending state in the forward direction. When the movable blade 11 is moved forward in that state, there is a problem that the pressure contact force and thus the load increase abnormally. That is, in the initial state where the movable blade 11 starts to move forward, the state is as shown in FIG. 12, whereas when the movable blade 11 moves forward, the state shown in FIG.
The state shifts to the state shown in 3. At this time, the pressing plate 31 and the movable blade 11 are, as described above, the screw members 33, 3 and 3.
It is screwed and fixed in two places by 4, so the gradient becomes larger as the forward movement progresses. Specifically, comparing the angle θ in FIG. 12 and the angle θ ′ in FIG. 13, θ ′ is larger. In other words, the pressure contact force will increase accordingly. This will be described with reference to the characteristic diagram of FIG. Figure 7
FIG. 4 is a diagram showing the change in which the horizontal axis represents the displacement of the movable blade 11 and the vertical axis represents the pressure contact force. In the conventional case, the characteristics are as shown in the diagram A, and it can be seen that the pressure contact force is abnormally increased. As described above, when the load is abnormally increased, various problems occur such that a large force is required to perform the cutting operation.

The present invention has been made on the basis of such a point, and its object is to suppress an abnormal increase in the pressure contact force when the blade moves in the forward direction to perform the cutting operation. It is an object of the present invention to provide an automatic cutter device capable of reducing the load and reducing the driving force required for the cutting operation.

[0009]

In order to achieve the above-mentioned object, an automatic cutter device according to the present invention has a movable blade reciprocally arranged on a cutter frame, and the movable blade is pressed and held by a pressing plate. In the automatic cutter device, in which the fixed blade is disposed at a predetermined position in the forward direction of the movable blade, and the movable blade and the fixed blade cut by reciprocating the movable blade, an opening is formed in the cutter frame. The portion is formed to reduce the increase in the pressure contact force when the movable blade is moved forward. At that time, it is possible to form the opening so that the mechanical balance is symmetrical. Further, it may be considered that the opening shape or the opening area of the opening is changed in the forward direction of the blade. Further, it is conceivable that the opening is brought into contact with the sheet introduction port formed in the cutter frame to form a flexible tongue piece.

[0010]

In the case of the present invention, an opening is formed in the cutter frame to reduce the increase in the pressure contact force when the movable blade moves in the forward movement direction during the cutting operation. At the position of the opening, the pressure contact of the movable blade between the pressing plate and the cutter frame is partially released, so that the increase in the pressure contact force is reduced. Further, when the openings are formed so that the mechanical balance is symmetrical, the effect of reducing the pressure contact force can be exerted in a state in which the lateral balance is maintained well. Further, when the opening shape or the opening area of the opening is changed in the forward moving direction of the movable blade, a higher pressure contact force reducing effect can be exhibited in the forward moving direction of the movable blade. .. Furthermore, when a flexible tongue is formed by connecting the opening to the paper inlet, the flexure of the tongue can be expected to provide a higher pressure contact force reducing effect.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. Incidentally, the same parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the case of this embodiment, the openings 101, 101 ′ having an inverted trapezoidal shape are formed in the cutter frame 3.
Is formed (indicated by a broken line in the figure). The openings 101, 101 'are formed symmetrically with each other, and are formed so as to gradually increase the opening area thereof in the forward direction of the movable blade 11. By forming such openings 101, 101 ', the movable blade 11
This suppresses an abnormal increase in the pressure contact force when moving in the forward direction, and thus in the load.

The operation and effect will be described based on the above configuration. When the movable blade 11 is moved in the forward direction to perform the cutting operation, the pressure contact force gradually increases. that time,
Cutter frame 3 supporting the movable blade 11 from below
Since the openings 101 and 101 'are formed in the
The pressure contact force is reduced at that portion. That is, the pressure contact state of the movable blade 11 between the pressing plate 31 and the cutter frame 3 is released at the openings 101 and 101 ′. In particular, the pressing force tends to increase as the movable blade 11 moves in the forward direction, while the opening portions 101 and 101 ′ gradually change their opening area toward the forward direction of the movable blade 11. Since it is formed so as to increase, the effect of reducing the pressure contact force by the openings 101 and 101 'becomes gradually higher in the forward direction of the movable blade 11, and the effect of reducing the pressure contact force is more effective. Can be achieved. Therefore, it is possible to obtain an effect such as preventing an abnormal increase in the load and reducing the driving force required for the cutting operation. Incidentally, it can be understood that the pressure contact force in the case of this embodiment is as shown by the line B in the characteristic diagram of FIG. 7, which is significantly reduced as compared with the conventional case. Further, since it is not necessary to add another component (for example, a leaf spring or the like) to adjust the pressure contact force,
It is possible to prevent an increase in the number of parts. Also, the cutter frame 3
There is also an advantage that the flatness of can be maintained as it is. or,
Since the openings 101 and 101 'have a bilaterally symmetrical shape and a bilaterally symmetrical mechanical balance, a smooth operation can be provided.

Next, a second embodiment will be described with reference to FIG. In the case of this embodiment, the cutter frame 3 is formed with triangular openings 105, 105 'symmetrically. Therefore, in this case as well, it is substantially the same as the case of the first and second embodiments. The same effect can be achieved. still,
As the shape of the opening, various shapes such as a quadrangle, a circle, and a rectangle can be considered in addition to the above shapes.

Next, a third embodiment will be described with reference to FIG. In the case of this embodiment, the elongated slit-shaped openings 107 and 107 'are formed symmetrically and in the shape of an inverted eight. Therefore, in this case as well, the first to third embodiments are performed. It is possible to obtain substantially the same effect as in the case of the example. In particular, assuming a triangular leaf spring as shown by the imaginary line in the figure, the relationship is such that the base end portion is notched, so the spring constant is reduced, and as a result, It is possible to exert an effect.

Next, a fourth embodiment will be described with reference to FIG. In the case of this embodiment, the elongated slit-shaped openings 109, 109 'are formed symmetrically and parallel to the reciprocating direction of the movable blade 11, and the tips of the openings 109, 109' are formed. Is connected to the paper inlet 5 to form a continuous opening. In this case, it is possible to expect a higher pressure contact force reducing effect than that in the first to third embodiments. This is because the tongue pieces 111, 111 ′, 11 which can bend in the cutter frame 3 are formed by forming the openings 109, 109 ′ as described above.
3 is to be formed. That is, when the movable blade 11 moves in the forward movement direction during the cutting operation, the tongues 111, 111 ′, 113 bend downward, whereby the pressure contact force is effectively reduced. It will be. In this case, the cutter frame 3
There is concern that the flatness of the openings may be impaired, but the above-mentioned openings 109, 10 are provided on condition that the required flatness is maintained.
The position and size of 9'may be determined.

Next, a fifth embodiment will be described with reference to FIG. In the case of this embodiment, the openings 115, 115 ′ corresponding to the openings in the fourth embodiment are formed in an eight shape, and are therefore substantially the same as in the case of the fifth embodiment. The effect of can be produced.

Next, a sixth embodiment will be described with reference to FIG. In the case of this embodiment, slit-shaped opening portions 117 and 117 ′ bent twice in an L shape are formed symmetrically,
The openings 117 and 117 ′ are connected to the sheet introduction port 5 to form continuous openings. In this case, the flexible tongues 119 and 119 'are formed, and the large tongue 121 is formed, so that the inner tongue 121 can largely bend, so that the fifth tongue is formed.
Also, the same pressure contact force reducing effect as in the case of the sixth embodiment can be obtained. Further, in the case of the configuration shown in FIG. 4 and FIG. 5, there is a concern that the paper is caught on the corners of the tongues 111, 111 ′, 113, but in the case of this embodiment,
Since there is no such part, the paper does not get caught.

The present invention is not limited to the above embodiments. First, as the shape of the opening, various shapes other than those shown in the figure can be considered. Further, the number of openings is not limited to one on each side.
Further, in each of the above-mentioned embodiments, the shape of the opening itself is symmetrical to the left and right in order to balance the mechanical balance between the left and the right. In some cases, it is possible. Further, it is needless to say that the symmetrical device in which the auto cutter device is incorporated is not limited to the small printer.

[0019]

As described in detail above, according to the automatic cutter device of the present invention, an opening is formed in the cutter frame to reduce the increase in the pressure contact force when the blade moves in the forward direction during the cutting operation. Since it is configured as described above, it is possible to prevent an abnormal increase in the pressure contact force and thus the load, and to reduce the driving force required for the cutting operation.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of an opening of a cutter frame according to a first embodiment of the present invention.

FIG. 2 is a plan view of a cutter frame according to a second embodiment of the present invention.

FIG. 3 is a plan view of a cutter frame according to a third embodiment of the present invention.

FIG. 4 is a plan view of a cutter frame according to a fourth embodiment of the present invention.

FIG. 5 is a plan view of a cutter frame according to a fifth embodiment of the present invention.

FIG. 6 is a plan view of a cutter frame according to a sixth embodiment of the present invention.

FIG. 7 is a characteristic diagram showing the relationship between the pressure contact force and the displacement of the movable blade.

FIG. 8 is a plan view of the automatic cutter device with the cutter cover removed, as used in the description of the conventional example.

FIG. 9 is a plan view of the cutter cover used in the description of the conventional example.

FIG. 10 is a plan view showing a positional relationship among a pressing plate, a movable blade, and a fixed blade used in the description of the conventional example.

FIG. 11 is a view showing a conventional example and is a rear view of an automatic cutter device.

12 is a cross-sectional view taken along line XII-XII of FIG. 8 showing a conventional example.

FIG. 13 is a cross-sectional view for explaining an increase in pressure contact force in a view showing a conventional example.

[Explanation of symbols]

 3 Cutter Frame 9 Fixed Blade 11 Movable Blade 31 Holding Plate 101 Opening 101 'Opening

Claims (4)

[Claims] 1. A movable blade is reciprocally arranged on a cutter frame and is held by a pressing plate, and a fixed blade is arranged on the cutter frame at a predetermined position in the forward direction of the movable blade. In an automatic cutter device configured to cut by a movable blade and a fixed blade by reciprocating the movable blade, an opening is formed in the cutter frame to increase a pressure contact force when the movable blade is moved forward. The automatic cutter device is characterized by reducing the 2. The automatic cutter device according to claim 1, wherein the opening is formed so that the mechanical balance becomes bilaterally symmetrical. 3. The automatic cutter device according to claim 2, wherein the opening portion changes the opening area or changes the opening area in the forward direction of the blade. apparatus. 4. The automatic cutter according to claim 2, wherein the opening is in contact with a sheet introduction port formed in the cutter frame, and a flexible tongue is formed. apparatus.