JP2002046389A - Time recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a time recorder capable of rapidly processing a controller at a low cost. SOLUTION: A control circuit of a processing tool of the time recorder has a solenoid 34 connected between a supply voltage Vmm and a switching transistor 3. The transistor 3 controls a current supply time to the solenoid 34 in response to a signal indicating an UP/DOWN to thereby control a current flowing to the solenoid and control an applied pressure to the tool to be energized by a workpiece by the solenoid 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamping machine for machining a workpiece such as a metal using a machining tool, and more particularly to a stamping machine capable of reducing costs.

[0002]

2. Description of the Related Art Conventionally, processing machines for processing accessories, jewelry and the like are commercially available.

[0003] Such a processing machine is capable of engraving photographs, pictures, characters and the like on a flat metal or plastic surface.

In a conventional stamping machine, when stamping a surface of a work material, a working tool is brought into contact with the work material by using a suction force of a solenoid, and the suction force of the solenoid at that time is controlled. This changes the embossing depth to form a pattern. Therefore, conventionally, PWM (Pulse Width Modulati
On), the applied voltage is controlled by controlling the effective current value.

[0005]

A control method for controlling a working tool of a conventional stamping machine has been performed as described above.

FIG. 11 is a circuit diagram showing an example of a control circuit for controlling a solenoid 200 in a conventional stamping machine.

Referring to FIG. 11, a conventional solenoid 20
0 is a pressurizing signal V corresponding to the pressing force of the machining tool.
OR circuit 10 to which _ref and feedback signal are input
AND, an UP / DOWN signal for instructing the vertical movement of the working tool and an output signal from the OR circuit 102
A circuit 101, an inverter 103 to which an output of the AND circuit 101 is input, two transistors 111 and 112 for controlling a supply voltage V _mm in accordance with an output of the AND circuit 101 and an output signal from the inverter 103; A transistor 1 that is connected and controls the output from the transistor 111 according to an inverted signal of the output signal
13 and a transistor 114 connected to the output of the transistor 112 and controlling the output from the transistor 112 in response to the inverted signal of the output signal from the inverter 103. The solenoid 200 is connected to the output of the transistors 111 and 112. ing.

FIG. 12 shows the UP in the circuit shown in FIG.
6 is a timing chart of a / DOWN signal and a pressurization signal _Vref . Referring to FIG. 12, conventionally, a necessary pressing force is applied to a working tool in synchronization with the rising of an UP / DOWN signal.

Referring to FIG. 11 and FIG.
In controlling the engraving machine, the pressurizing signal V _refBased on sole
The current applied to the solenoid 200 was controlled. for that reason,
The circuit configuration is complicated and expensive.
Was.

In addition, there has been a problem that it has not been possible to follow the recent increase in machining speed. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an inexpensive and high-speed stamping machine.

[0011]

An embossing machine according to the present invention comprises a working tool and a solenoid for moving the working tool vertically in opposition to the work material so that the work tool contacts the work material. And control means for controlling an applied voltage and an application time to the solenoid, and the control means controls the application time with the applied voltage kept constant.

The solenoid has a characteristic that the current value increases only gradually even when a voltage is applied. In the present invention, utilizing this characteristic, the current value is controlled by controlling the application time while keeping the applied voltage constant. Since the current value can be controlled by controlling the application time, it is possible to control the pressing force (power = voltage × current) by keeping the voltage constant. As a result, the pressing force can be controlled without using a complicated circuit as in the related art.

Further, since only the application time is controlled, the control can be performed in a short time. As a result, high-speed processing can be performed. Preferably, the control means includes a first electrode connected to a first potential through a solenoid and a second electrode connected to a second electrode different from the first potential. A signal for controlling the application time is input to the control electrode. Since the control means can be constituted by a single transistor, it is possible to provide an inexpensive and simple stamping machine.

[0014] More preferably, when the processing tool is brought into contact with the processing tool to process the processing material, a recess having a predetermined diameter is formed in the processing material for a predetermined application time, and the control means includes: A storage unit for storing an application time for forming a depression having a predetermined diameter for each workpiece material is included.

Since the control means stores the application time for forming a dent having a predetermined diameter for each material to be processed, desired processing can be performed on an arbitrary material to be processed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view showing the entire configuration of a stamping machine to which a control device for a working tool according to the present invention is applied.

Referring to FIG. 1, a stamping machine includes a working tool 11
And a carriage 10 for holding X in FIG.
And a moving part (not shown) for moving in the Y direction, and a pedestal 12 provided on the processing tool 11 for mounting the material to be processed.

A plate spring 22 for urging the processing tool 11 upward in the drawing is provided below the processing tool 11.

FIG. 2 shows a working tool 1 of the stamping machine 1 shown in FIG.
1 and a host computer 3 for controlling the processing tool 11
It is the schematic diagram which showed the principal part of 0.

Referring to FIG. 2, the carriage 10 is held by a rail (see 13 in FIG. 1) movable in the X-axis direction and the Y-axis direction via a carriage base (not shown). A solenoid mounting member 17 is mounted on the carriage 10. This solenoid mounting member 17
Is mounted with a solenoid 15. The plunger 1 extends through the solenoid 15 almost at the center of the solenoid 15.
6 are provided. The lower part of the plunger 16 is the machining tool 11
And the plunger 16 and the working tool 11 are driven up and down by the driving of the solenoid 15. That is, when the solenoid 15 is energized, the solenoid 1
5 sucks the plunger 16 and moves the processing tool 11 to the leaf spring 2.
Lower against the biasing force of 2. Therefore, machining tool 1
1 is brought into contact with the surface of the workpiece 20 placed on the upper surface of the pedestal 12 so that a desired concave portion can be given to the workpiece 20 by changing the pressing force at the time of contact. Has become.

Here, the attraction force of the solenoid 15 changes according to the energizing time supplied to the solenoid 15, the bending amount of the leaf spring 22 changes, and the pressure at which the working tool 11 contacts the workpiece 20 also changes.

In the above configuration, the stamping machine 1 is driven by a motor for driving the carriage in the X direction (not shown) and a motor in the Y direction (not shown) according to image data output from the host computer 30 based on a known technique. ,
The carriage 10 is moved relative to the workpiece 20 in the X-Y axis direction, and a predetermined current is supplied to the solenoid 15 to suck the plunger 16 and the processing tool 11 integrated therewith is moved by a leaf spring. It is lowered to face 22. Then, the processing tool 11 is brought into contact with the surface of the workpiece 20 to apply a predetermined pressure, and the processing tool 11 draws character data and / or image data on the upper surface of the workpiece 20.

Next, a method of controlling the processing pressure of the processing tool 11 in real time during drawing by the embossing machine 1 will be described.

The CPU 31 of the host computer 30 stores a power-on time-pressure conversion table storing the relationship between the power-on time of the solenoid 15 for raising and lowering the plunger 16 and the pressure.

The CPU 31 transmits a machining signal to the solenoid 15 via the solenoid control unit 32 and the driver 33.

FIG. 3 is a diagram showing the relationship between the application time and the current value when the applied voltage of the solenoid 15 is kept constant. Referring to FIG. 3, solenoid 15 has such a characteristic that even when a voltage is applied, the current value increases only gradually. In the present invention, utilizing this characteristic, the current value is controlled by controlling the application time while keeping the applied voltage constant.

That is, since the current value can be controlled by controlling the application time, it is possible to control the pressing force (power = voltage × current) by keeping the voltage constant.

FIG. 4 shows a solenoid control unit 3 for controlling the solenoid 15 according to the present invention utilizing the characteristics shown in FIG.
FIG. 3 is a circuit diagram showing a main part of the second embodiment. Referring to FIG. 4, solenoid control unit 32 is provided between solenoid 15 connected to supply voltage V _mm and solenoid 15 and ground GND, and receives signal UP / DOWN for instructing vertical movement of a working tool. And a transistor 3 for inputting the application time to the control power.

The current applied to the solenoid 15 can be controlled by controlling the application time of UP / DOWN for controlling the pressurization time. As a result, a switching circuit using a single transistor can be used instead of the conventional PWM control circuit.

As described above, in the present invention, the control circuit can be greatly simplified as compared with the conventional circuit shown in FIG.

FIG. 5 is a timing chart showing an UP / DOWN signal output from the solenoid control unit 54. The UP / DOWN signal indicating the vertical movement of the solenoid 15 and the pressing force are given by one signal. That is, the pressing force of the working tool (indicated as “pen pressure” in the figure) increases in proportion to the application time.

Next, actual processing data will be described.
FIG. 6 is a diagram showing a tip shape of a working tool applied to the stamping machine 1 according to the present invention. Referring to FIG. 6, machining tool 1
The tip of 1 is made of a diamond tip having a vertex angle of 90 °, and the tip has a diameter SR of 0.01 mm.

FIG. 7 shows actual load amounts and dot diameter data in a state where various types of workpieces 20 are processed using such a processing tool 11, and FIG. 8 shows the data in a graph.

FIG. 7 also shows the dot depth when the workpiece 20 calculated from the applied current is brass.

Here, aluminum, copper and brass were used as the material to be processed. Next, the original data of the data shown in FIGS. 7 and 8 will be described. FIG. 9 is a diagram showing the relationship between the pulse width and the dot diameter, which is the source of the load shown in FIGS. 7 and 8, and shows the applied pulse width of each material and the shape formed on the material to be processed. FIG. 6 is a diagram showing a relationship with a dot diameter. As the processing conditions, a pulse width of 460 to 190
The data was changed in the range of 0 μs, during which data at several points was recorded.

It can be seen that the dot diameter increases as the pulse width increases for each material. Also, it can be seen that if the pulse width is too small, the dot diameter cannot be measured.

FIGS. 10A to 10D are graphs showing data obtained by actually measuring the waveforms of the application time to the solenoid 15 and the current value, which are the basis of the data shown in FIG. As is clear from FIG. 10, the current value increases in proportion to the application time, thereby forming dots proportional to the current value. The same tendency was observed in any of the aluminum, copper and brass materials as shown in FIG.

In this case, the power supply voltage is constant at 30 V, and the cycle of the solenoid 15 is 200 Hz.

Further, it is assumed that the application time for forming the depression having a predetermined diameter for each material to be processed is stored in a memory (not shown) of the host computer 30 shown in FIG.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is an external view showing the entire configuration of a stamping machine.

FIG. 2 is a schematic view showing a periphery of a working tool and a control unit of the stamping machine.

FIG. 3 is a diagram illustrating a relationship between an application time and an applied current to a solenoid.

FIG. 4 is a circuit diagram showing a main part of a control circuit according to the present invention.

FIG. 5: UP / DO output from solenoid control unit
5 is a timing chart showing a WN signal.

FIG. 6 is a view showing a tip portion of a working tool.

FIG. 7 is a diagram showing dot diameters for various loads of various materials to be processed.

FIG. 8 is a graph showing a relationship between a load and a dot diameter in each material.

FIG. 9 is a diagram showing a relationship between a pulse width and a dot diameter in each material.

FIG. 10 is a graph showing the relationship between the time during processing of each material and the current value.

FIG. 11 is a circuit diagram showing a conventional control circuit in an embossing machine.

FIG. 12 is a diagram showing signals applied to a conventional solenoid.

[Explanation of symbols]

1 stamping machine, 3 transistor, 10 carriage, 1
1 machining tool, 12 pedestals, 15 solenoids, 16 plungers, 20 workpieces, 30 host computer.

Claims (3)

[Claims] A working tool; a solenoid for moving the working tool in a vertical direction facing the work material so as to contact the work tool with the work material; and a voltage applied and applied to the solenoid. Control means for controlling time, wherein the control means controls the application time with the applied voltage kept constant. 2. The control unit includes: a first electrode connected to a first potential via the solenoid; a second electrode connected to a second electrode different from the first potential; The engraving machine according to claim 1, further comprising a transistor including a control electrode, wherein a signal for controlling the application time is input to the control electrode. 3. When the processing tool is brought into contact with the processing tool to process the processing material, a recess having a predetermined diameter is formed in the processing material for a predetermined application time. 3. The stamping machine according to claim 2, wherein the control unit includes a storage unit that stores an application time for forming the depression having the predetermined diameter for each of the workpieces.