JPH10225900A - Cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting machine in which a condition of a knife tip can be correctly recognized based on cutting resistance applied to a knife at the time of cutting regardless of thickness of a object to be cut. SOLUTION: A cutting machine is provided with a book carrier passage 8 on which a book 10 as a object is carried, a gate 1 provided on the book carrier passage 8 to position the book 10, a carrier roll 7 to apply a tip part of the book 10 to the gate 1, a motor 3 to drive a knife 2 vertically, a measuring machine 4 to measure consumed power of the motor 3, a memory part 6 to receive information related to the number (n) of paper sheets for composing the book 10 to be memorized, and a determination part 5 to determine a tip condition of the knife 2 based on the number (n) of the paper sheets memorized in the memory part 6 and the consumed power P of the motor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for cutting an object to be cut such as a booklet, and more particularly to a cutting machine capable of accurately and promptly recognizing a state of a knife edge.
More specifically, the present invention relates to a cutting machine capable of accurately and promptly recognizing whether or not a blade edge of a knife is worn or a blade is spilled.

[0002]

2. Description of the Related Art Various cutting machines have been proposed as cutting machines for cutting a cut material such as a booklet. However, in such a cutting machine, resistance received by a knife at the time of cutting (hereinafter, referred to as cutting resistance). If the diameter is excessively large, the blade edge of the knife is rapidly worn or broken, thereby shortening the life of the knife. For this reason, it is necessary to accurately and promptly recognize the time for replacing the knife, and conventionally, it has been artificially confirmed by, for example, putting a finger on the blade edge.

However, such a checking method is not only dangerous, but also it is difficult to recognize the sharpness of the knife quantitatively, so that it is difficult to accurately recognize the sharpness of the knife. There was a problem that it would.

In order to solve such a problem, for example, Japanese Utility Model Laid-Open Publication No. Sho 62-159298 discloses an additional detector for detecting a cutting resistance acting on a knife at the time of cutting. There has been proposed a cutting machine capable of recognizing a knife replacement time.

[0005]

The cutting resistance acting on the knife at the time of cutting depends not only on the state of the knife edge (sharpness, presence or absence of blade spill, etc.) but also on the thickness of the cut object. However, since the thickness of the cut object is not taken into consideration in the above-described related art, there is a problem that the sharpness of the knife cannot be accurately recognized unless the thickness of the cut object is constant. For example, in an extreme case, even if the knife has a blade spill and cutting resistance increases,
Since the cut object is thin, if the cutting resistance is small as an absolute value, there is a problem that blade spill cannot be detected.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to accurately recognize the state of the knife edge based on the cutting resistance acting on the knife at the time of cutting regardless of the thickness of the cut object. An object of the present invention is to provide a cutting machine.

[0007]

In order to achieve the above object, a cutting machine according to the present invention represents a driving means for driving a cutting knife supplied with electric energy and a thickness of a cut object. Thickness information output means for providing information; measuring means for measuring electric energy consumed by the driving means; and determination of the state of the blade edge of the knife based on the output thickness information and the measured electric energy. It is characterized in that it is provided with a determination means for performing the determination.

According to the above configuration, the booklet thickness is taken into consideration when judging the state of the knife edge based on the power consumption of the motor representing the cutting resistance, so that regardless of the thickness of the booklet to be cut, The state of the knife edge can be accurately recognized based on the cutting resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of a booklet editing system to which the cutting machine according to the present invention is applied, and a printer 5 for printing image information transferred from a higher-level device on recording paper.
0, a stack of paper sheets sequentially discharged from the printer 50, folding in two, and further fixing them with a stapler or the like to form a booklet, and a cutting machine 70 for cutting off unnecessary portions of the booklet. ing.

FIG. 2 is a side view (including a block diagram of a main part of a control system) showing a configuration of the cutting machine 70 according to the first embodiment of the present invention. The booklet conveyance path 8 to be conveyed, the gate 1 provided on the booklet conveyance path 8 for positioning the booklet 10, the conveyance roll 7 for abutting the leading end of the booklet 10 against the gate 1, and the knife 2 are driven vertically. Motor 3, a measuring device 4 for measuring the power consumption of the motor 3, and a storage unit 6 for receiving and storing the number of sheets n as thickness information of the booklet 10 from the printer 50.
And a determination unit 5 that determines the state of the blade edge of the knife 2 based on the number n of sheets stored in the storage unit 6 and the power consumption P of the motor 3 measured by the measuring device 4.

In the cutting machine having such a configuration, the booklet 10 conveyed on the conveyance path 8 with the end face opposite to the end face to be cut first is provided in advance in accordance with the cutting position of the booklet 10. It stops in a state where it hits the gate 1. The transport roll 7 stops when the booklet 10 hits the gate 1 and is positioned. When the booklet 10 is positioned, the motor 3 is energized to start cutting. The power consumption P of the motor 3 at this time is measured by the measuring device 4. The power consumption P can be measured, for example, based on the current flowing through the field coil of the motor 3 and the terminal voltage.

Here, the thickness t of the booklet 10 and the booklet 1
The relationship with the power P consumed by the motor 3 when cutting 0 is a proportional relationship as shown by the solid line in FIG. The proportional relationship between the two gradually shifts in the direction of the arrow in the figure as the sharpness of the knife 2 deteriorates. For example, when the proportional relationship indicated by the broken line is reached, the knife 2 needs to be replaced. Therefore, the determination unit 5 obtains the booklet thickness t (n) based on the number n of sheets stored in the storage unit 6, and the power consumption P when cutting this booklet is a reference given by the proportional relationship of the broken line. If the power exceeds Pref, a message signal S1 for prompting replacement of the knife 2 is output.

FIG. 4 is a block diagram showing an example of the configuration of the determination section 5. As shown in FIG. The booklet thickness calculator 53 calculates the thickness t (n) of the booklet 10 based on the number n of sheets stored in the storage unit 6 and a sheet thickness registered in advance. The function relation storage unit 51 stores the booklet thickness t described with reference to FIG.
The power consumption reference value Pref, which can determine that the knife edge is worn and the sharpness is reduced or the blade is spilled or chipped based on the relationship between the power consumption P and the power consumption P, is a data table format as a function of the booklet thickness t. Is remembered. The reference power extracting unit 52 searches the function relationship storage unit 51 using the booklet thickness t (n) calculated by the booklet thickness calculating unit 53 as a parameter, and obtains the reference power consumption Pref () corresponding to the booklet thickness t (n). Extract n). The comparing unit 54 compares the actual power consumption P measured by the measuring device 4 with the reference power consumption Pref (n), and replaces the knife when the power consumption P exceeds the reference power consumption Pref (n). Is output.

According to this embodiment, the reference value Pre relating to the power consumption P of the motor, which is used as a material for determining the state of the knife edge.
Since f is determined for each booklet thickness t, the state of the knife edge can be accurately recognized based on the cutting resistance of the knife, regardless of the thickness of the booklet to be cut.

In the first embodiment of the present invention described above, the booklet thickness t has been described as being uniquely determined based on the number n of the recording sheets. It also changes depending on the thickness. Therefore, if sheets of different thicknesses are used, the booklet thickness t cannot be determined accurately, and as a result, the state of the knife edge recognized based on the power consumption of the motor differs from the actual state. In some cases. Therefore, in the second embodiment of the present invention described below, the state of the knife edge can be accurately recognized irrespective of the thickness of the paper constituting the booklet.

FIG. 5 is a view showing the configuration of a cutting machine according to a second embodiment of the present invention, and the same reference numerals as those described above denote the same or equivalent parts. In the present embodiment, the booklet 10
Is provided with a sensor 9 for measuring the thickness t of
As shown in FIG. 6, the reference power extracting unit 52 searches the functional relationship storage unit 51 based on the actual measurement value t of the booklet thickness. According to the present embodiment, the state of the knife edge can be accurately recognized based on the cutting resistance regardless of the thickness of the paper forming the booklet 10.

On the other hand, even if the cutting edge of the knife is worn and the sharpness is reduced, unless the motor is locked during cutting, the influence on the cut object is small, and the cut surface is somewhat fragile. It is about. However, if the blade is spilled or chipped, the cut surface becomes dirty. Therefore, it is necessary to detect the blade spill or the like reliably and promptly. Therefore, in the third embodiment of the present invention described below, blade spills and chipping can be immediately detected.

FIG. 7 is a view showing the configuration of a cutting machine according to a third embodiment of the present invention, and the same reference numerals as those described above denote the same or equivalent parts. In the present embodiment, the measuring device 4
The power consumption of the motor 3 measured this time is compared with the previous power consumption, and when the difference between the two becomes greater than or equal to a predetermined value, a blade spillage detecting unit 12 that outputs a message signal S2 indicating that a blade spillage or the like has occurred is provided. There is a characteristic in the point. According to the present embodiment, it is possible to reliably and promptly detect blade spilling or chipping of the knife.

[0019]

As described above, according to the present invention, the reference value Pref relating to the power consumption P of the motor, which is used as a material for judging the state of the knife edge, is determined for each booklet thickness t. Regardless of the thickness of the booklet, the state of the knife edge can be accurately recognized based on the cutting resistance of the knife.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a booklet editing system to which a cutting machine according to the present invention is applied.

FIG. 2 is a diagram illustrating a configuration of a first exemplary embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship between booklet thickness t and power consumption P of a motor.

FIG. 4 is a block diagram illustrating an example of a configuration of a determination unit 5 of FIG. 2;

FIG. 5 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 6 is a block diagram showing an example of a configuration of a determination unit 5a of FIG.

FIG. 7 is a diagram showing a configuration of a third embodiment of the present invention.

[Explanation of symbols]

1 ... gate, 2 ... knife, 3 ... motor, 4 ... measuring machine,
5, 5a: determination unit, 6: storage unit, 7: transport roll, 8 ...
Booklet transport path, 9: Sensor, 10: Booklet, 70: Cutting machine

Claims (6)

[Claims] 1. A knife for cutting an object to be cut, driving means for driving the knife by being supplied with electric energy, thickness information output means for providing information representing the thickness of the object to be cut, and the driving means Cutting means for measuring the electric energy consumed in step (a), and determining means for determining the state of the blade edge of the knife based on the output thickness information and the measured electric energy. Machine. 2. The storage device according to claim 1, wherein the determining unit stores a functional relationship between a thickness of the cut object and electric energy consumed by the driving unit when a cutting edge of the knife is in a predetermined state. An extraction unit configured to extract electric energy corresponding to the output thickness information from the storage unit; and a comparison unit configured to compare the extracted electric energy with the measured electric energy. 2. The cutting machine according to claim 1, wherein the determination is made based on a comparison result by the comparing unit. 3. The scheduled state is one of a state where it is recognized that the sharpness of the knife has dropped, a state where it is recognized that the blade tip has spilled, and a state where it is recognized that the blade chipping has occurred. The cutting machine according to claim 2. 4. The cutting machine according to claim 1, wherein the thickness information output unit is a storage unit that stores separately input thickness information. 5. The cutting machine according to claim 1, wherein the thickness information output unit is a sensor that detects a thickness of the cut object and outputs a signal according to a detection result. 6. A knife for cutting an object to be cut, a driving unit for supplying the electric energy to drive the knife, a measuring unit for measuring electric energy consumed by the driving unit, A cutting means for comparing the electric energy measured at the time of cutting with the electric energy measured at the time of the previous cutting to determine the state of the knife edge.