JPH09201780A - Motor-driven driving device for stapler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the efficiency of fastening work by driving an electric motor while selecting whether the electric motor is driven at a high speed or at a high output in accordance with the load to the electric motor during the fastening process of articles to be fastened by means of staples. SOLUTION: Both a staple magazine and a driver driving block are moved through an electric spring along a guide block until they are abutted on the articles to be tightened. Until the staple magazine is abutted on the articles to be tightened, the load is low, so that a motor-driving control part 32 (not shown) rotates an electric motor 31 at a high speed, so that the driver driving block is moved at a high speed. On the other hand, until the completion of tightening after the staple magazine is abutted on the articles to be tightened, the load is high, so that the motor-driving control part 32 drives the electric motor 31 at a high output by means of the detection signal of a sensor 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric drive device for a metal stapler for binding a relatively thin metal plate to each other or a metal thin plate and a wooden board.

[0002]

2. Description of the Related Art A stapler for metal for binding together relatively thin metal plates has a large driving force for penetrating the staple legs through the metal plates. Some of them use a toggle mechanism so that they can be driven manually, but it is required to further utilize power to facilitate the work.

It is possible to use compressed air or electric power as the power, but when compressed air is used, a large diameter cylinder / piston mechanism is required to obtain a large propulsive force, and the tool becomes large and heavy. It is not suitable for portable tools.

Further, it is known that when electric power is used, the rotational output of the electric motor is decelerated to utilize the helical propulsive force by the screw shaft that rotates.

[0005]

However, in the case of the stapler, the load until the staples come into contact with the material to be stapled and the staple legs penetrate the material to be clinched is large. Therefore, the reduction ratio of the rotational drive of the screw shaft is large. Will need to be increased. However, if the reduction ratio is increased, the operating speed becomes slower even though a large load is not generated until the stapler comes into contact with the material to be bound and when the clinching is completed and the operating portion retreats. There is a problem that the work efficiency is lowered and the work efficiency is not improved. Further, since the motor is driven for a long time for one stapling operation, in a portable tool driven by a rechargeable battery, the number of stapling operations per charge may be reduced, which may hinder the work.

The present invention solves the above problems and selects whether to drive the electric motor at a high speed or a high output depending on the load on the electric motor in the step of stapling the material to be bound by stapling. It is an object of the present invention to provide an electric drive device for a stapler that drives an electric motor by using an electric stapler to improve the efficiency of the stapling work and to suppress the consumption of the battery that is the power source so as not to hinder the work. And

[0007]

In order to solve the above-mentioned problems, an electric drive device for a stapler according to the present invention takes out the output of an electric motor as a rotational force of a screw shaft through a speed reducer, and rotates the screw shaft. A stapler for driving a driver to drive a staple supplied from a staple magazine toward a clincher by bringing a staple magazine into contact with a material to be bound by a stapler and stapling the material to be bound. The electric motor is driven at a high output from the time when the driver abuts the material until the stapling is completed by the driver until the staple magazine abuts the material to be bound and the staple magazine after the stapling is completed. And between the driver and the return movement, the drive control unit of the electric motor for driving the electric motor at high speed is provided. That.

It should be noted that the electric motor is composed of a DC compound winding motor having a shunt winding field coil and a series winding field coil, and the load of the electric motor is detected by a sensor, and the control section controls the sensor. Based on the detection result, the direct winding field coil is energized and the staple magazine contacts the material to be bound during a high load from when the staple magazine contacts the material to be bound until the driver drives out the staple and completes stapling. In addition, the shunt field coil may be energized to drive the electric motor during low load until the staple magazine and the driver return to their original positions after the completion of the stapling.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are a side view and a bottom view of the stapler. In this stapler, a clincher 2 is formed at one end of a C-shaped jaw 1 and a slide guide 4 is formed at the other end thereof.
The driver drive block 6 and the staple magazine 7 are slidably arranged, and the driver drive block 6 is screwed onto the screw shaft 8 which is the output shaft of the electric drive mechanism A, so that the screw shaft 8 rotates forward. By doing so, it moves in the direction of the clincher 2 along the slide guide 4, drives the driver 5, and ejects the staples 10 supplied to the staple ejection path in the staple magazine 7 toward the clincher 2 to remove the material 11 to be bound. It is to stop spelling.

The clincher 2 is formed on a clincher holder 12 formed at one end of the jaw 1, and a clincher groove 13 is formed at the tip thereof.

The slide guide 4 has a continuous guide groove 1
4, a staple magazine 7 and a driver drive block 6 are slidably arranged in the guide groove 14.

As shown in FIGS. 3 to 5, a staple driving path 3 is formed in the staple magazine 7, and an open end of the staple driving path 3 is formed so as to face the clincher 2. A staple magazine 7 and a slide path 16 for the staple leg regulating member 15 are formed in the staple ejection path 3 as openings. The staple magazine 7 is provided on the side of the slide guide 4,
A staple supply path 17 is formed inside, and a pusher 18 for urging a spring so as to supply the stored staple 10 to the staple ejection path 3 is arranged. In addition, the sliding path 1 of the staple leg regulating member 15
6 is arranged in parallel with the ejection end portion side of the staple supply path 17, and is formed narrower than the staple ejection path 3 by the staple legs on both sides as shown in FIGS. An inclined surface 15a is formed at a portion of the staple leg regulating member 15 facing the ejection path 3, and a compression spring 20 is arranged on the back surface thereof. Therefore, the staple leg restricting member 15 is constantly pressed by the compression spring 20.
The proximal end portion of 5a is retracted from the staple ejection passage 3, the leading end thereof enters the staple ejection passage 3, and both side surfaces 15b of the staple leg regulating member 15 are partially inside the staple ejection passage 3 inside the staple ejection passage 3. Is urged to close the.

A driver 5 is integrally fixed to the driver drive block 6, and the driver 5 is slidably accommodated in a driver guide passage 21 continuous with the staple ejection passage 3.

A connecting rod 23 fitted with a resilient spring 22 is interposed between the staple magazine 7 and the projecting piece 6a protruding laterally from the tip of the driver drive block 6. One end of the connecting rod 23 is fixed to the staple magazine 7, the other end slidably penetrates the projecting piece 6a, and an bulging projection 23a is formed at this end. As a result, the driver drive block 6 and the staple magazine 7 are provided so as to be held by the elastic spring 22 at a constant distance determined by the connecting rod 23.

Next, a guide block 25 is formed on the slide guide 4 so as to project to the side opposite to the staple magazine 7, and one end of the screw shaft 8 is rotatably passed through this guide block 25, and this end is formed. A bulging portion 8a is formed on the portion. The other end of the screw shaft 8 is screwed through the driver drive block 6 and disposed inside the body portion 26, and is linked to the electric drive mechanism A.

The electric drive mechanism A includes a reduction gear 30 composed of a plurality of reduction gears (not shown), an electric motor 31, a motor drive control section 32, a trigger switch 34 which operates in conjunction with a trigger lever 33, and a grip. 27 is a detachable battery 35 and a sensor 4 for detecting the load of the motor.
And 3. The motor drive control unit 32 is arranged above the staple magazine 7 and is turned on when the driver drive block 6 reaches the end point to recognize that spelling is completed and a spelling completion detection limit switch 36 and below the body unit 26. After the completion of the spelling, when the driver drive block 6 reaches the starting point, it is turned on to recognize the completion of the return, and the forward / reverse rotation and stop of the motor 31 are controlled by the detection result with the return detection limit switch 37. Sensor 4 that detects current and changes in load
On the basis of the detection result of No. 3, a high load (at the time of stapling) and a low load (at the time of driving and driving the driver drive block 6 and the staple magazine 7) are recognized, and at the time of high load, the electric motor 3
1 is driven at a high output and the electric motor 31 is driven at a high speed when the load is low to shorten the time required for one stitching operation.

The usage of the electric drive device for the stapler having the above-described structure will be described. First, the leading staple 10 in the staple magazine 7 is supplied to the staple ejection path 3 as shown in FIG. Then, when the trigger lever 33 is pulled, the trigger switch 34 is turned on and the motor drive control unit 32 causes the electric motor 31 to rotate in the forward direction.
When the screw shaft 8 rotates forward in conjunction with the electric motor 31, the driver drive block 6 is moved and driven in the clincher 2 direction. The driver 5 is a driver drive block 6
However, at this time, the staple magazine 7 also moves along with the driver drive block 6 along the guide block 25 via the elastic spring 22 until it comes into contact with the material 11 to be bound. Since the load is low until the staple magazine 7 contacts the binding material 11, the motor drive control unit 32 rotates the electric motor 31 at high speed to move the driver drive block 6 at high speed.

When the staple magazine 7 comes into contact with the binding material 11, the binding material 11 is sandwiched between the clincher 2 and the staple magazine 7. The movement of the staple magazine 7 is stopped at this point, but the screw shaft 8 continues to rotate in the forward direction, so that the driver drive block 6 further moves while compressing the elastic spring 22. The driver 5 integrated with the driver drive block 6 slides in the driver guide passage 21 and engages with the crown portion 10b of the staple 10 in the staple ejection passage 3 to eject the staple 10.
The staple legs 10a are punched into the material 11 to be bound from the openings, and at the same time when the staple legs 10a are penetrated, they are bent inward toward each other to complete the work. Since the load is high from the time when the staple magazine 7 comes into contact with the material 11 to the time when the binding of the material 11 is completed, the motor drive control unit 32 outputs the electric motor 31 at a high output based on the detection signal of the sensor 43. To drive.

When the driver 5 moves until the spelling is completed, the driver drive block 6 turns on the spelling completion detection limit switch 36, so that the motor drive control unit 32 reverses the rotation direction of the electric motor 31 and reversely rotates the screw shaft 8. Let The driver drive block 6 is driven by the reverse rotation of the screw shaft 8.
After returning to the starting point and returning to the starting point, the return detection limit switch 37 is turned on, so that the motor drive control unit 32 stops the rotation of the electric motor 31. Since the load is low during the return movement of the driver drive block 6, there is no detection output signal of the sensor 43, and the motor drive control unit 32 rotates the electric motor 31 at high speed to move it at high speed.

When the driver drive block 6 returns to a predetermined distance, the elastic force of the elastic spring 22 causes the material 11 to be bound.
The staple magazine 7 that has been pressed against the bulge 23a of the connecting rod 23 hits the projecting piece 6a,
It moves away from the material 11 to be bound.

As described above, according to the electric drive device of the stapler, the drive of the electric motor, which is the power, is controlled by changing the load, the electric motor is driven at high speed and low output when the load is low, and low speed and high output when the load is high. Since it is driven, it is not necessary to increase the reduction gear ratio of the reducer to constantly drive in response to a high load, and it is possible to speed up the stapling work per time and to drive the electric motor for a long time. This eliminates the consumption of the battery and can significantly increase the processing amount of the stapling work by charging once.

The body portion 26 is connected to the grip portion 27 so as to be rotatable 360 degrees in the axial direction, and the body portion 26 is rotated in accordance with the position of the binding stop of the material to be bound, so that the clincher, Since the staple magazine and the driver drive block are provided so as to rotate integrally with the grip part, it is not necessary to work by turning the body direction or wrist depending on the spelling stop position, and work in terms of work posture as well. It is possible to provide a highly efficient stapler.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric drive device for a stapler will be described with reference to the drawings.

FIG. 6 shows a circuit diagram of the electric drive device. The electric drive device includes an electric motor 31 and a motor drive controller 32.
The motor drive controller 32 includes a controller (microprocessor) 40 for controlling the electric motor 31 according to a control program stored in advance in a memory, and an armature winding of the electric motor 31. Switching elements Tr1 to Tr4 for switching the direction of the current flowing through the coil and the shunt field coil 4
1 is connected in series to the switching element Tr5 and the series winding field coil 42 is connected in parallel to the switching element Tr.
6 and a sensor (resistive element) 43 that detects a change in load by the value of the current flowing in the motor circuit. The controller 40 is arranged above the staple magazine 7 shown in FIG. O is reached
A spelling completion detection limit switch 36 for recognizing that the spelling is completed, and a return detection for recognizing the completion of restoration by turning on when the driver drive block 6 placed under the body portion 26 reaches the start point after completion of spelling. Detection signals dt1 and dt2 with the limit switch 37 are input.

The sensor 43 is not limited to a resistance element as long as it can detect a change in current flowing through the circuit, and a Hall element type current sensor or the like may be used.

According to the electric drive device of the stapler having the above structure, the trigger switch 33 is pulled by pulling the trigger lever 33.
When turned ON, the controller 40 outputs OUT1, OU
When T3 and OUT4 are in the ON state and OUT2 is in the OFF state, the switching elements Tr1 and Tr4 are turned on so that the current flowing in the armature winding of the electric motor 31 flows in the direction of the arrow a for forward rotation, and the switching elements Tr5 and T4 are turned on.
r6 is turned on to short-circuit the circuit of the field winding coil 42,
Since the shunt field coil 41 is energized, the electric motor 31 is driven at high rotation and low output. When the electric motor 31 rotates in the forward direction, the screw shaft 8 rotates in the forward direction and the driver drive block 6 is driven to move in the clincher 2 direction. At this time, the staple magazine 7 also moves along with the driver drive block 6 along the guide block 25 via the elastic spring 22 until it comes into contact with the material 11 to be bound. When the staple magazine 7 comes into contact with the material 11 to be bound, the load increases, so that the rotation speed of the electric motor 31 decreases and the current value of the circuit of the electric motor 31 increases, so that the output voltage (terminal voltage of the resistor R) Vr of the sensor 43 increases. Since it becomes larger, the controller 40 outputs OUT3 and OUT4.
Is turned off to switch the switching elements Tr5 and Tr5.
6 is turned off to cut off the circuit of the shunt winding field coil 41, and the series winding field coil 42 is energized to drive the electric motor 31 at a low rotation and high output.

The driver drive block 6 is further moved and driven in the direction of the clincher 2 against the resilient spring 22, the driver 5 ejects the staple 10, and the staple leg 10a is ejected from the opening portion into the material 11 to be penetrated. After that, the work is completed by being bent by the clincher 2.

When the driver 5 moves to the end of spelling stop, the driver drive block 6 turns on the spelling completion detection limit switch 36.
In response to the detection signal dt1 output by the controller 40, the controller 40 inverts the signals of the outputs OUT1 and OUT2, respectively.
By turning off r1 and Tr4 and turning on Tr2 and Tr3, the current flowing through the armature winding of the electric motor 31 is indicated by an arrow b.
Reverse the direction and rotate backward. When the electric motor 31 rotates in the reverse direction, the screw shaft 8 rotates in the reverse direction, and the driver drive block 6 is driven to move in the direction away from the clincher 2.
At this time, the driver 5 has no load, so the load of the electric motor 31 is reduced and the rotation speed is increased. When the rotation of the electric motor 31 rises, the electric current of the motor circuit decreases and the sensor 4
Since the output voltage of 3 (the terminal voltage of the resistor R) becomes small, the controller 40 turns on the switching elements Tr5 and Tr6 to short-circuit the circuit of the series winding field coil 42, and supplies a current to the shunt winding field coil 41. The electric motor 31 is driven at high rotation and low output to return the driver drive block 6 at high speed.

When the driver drive block 6 returns, the return detection limit switch 37 arranged below the body portion 26 is pushed by the driver drive block 6 to be turned on and outputs the detection signal dt2, so that the controller 40 drives the driver. It is judged that block 6 has reached the starting point, and the output OUT
1 and OUT2 are turned off, and switching elements Tr1 to
Tr4 is turned off, the electric power supply to the electric motor 31 is cut off, and the electric motor 31 is stopped.

The controller 40 drives the electric motor at the rising edge of the output signal of the trigger switch 34,
It is not necessary to keep pulling the trigger switch 34 by programming in advance so that the return detection limit switch 37 is stopped by being activated.

Further, in the above embodiment, the switching between the high speed drive by energizing the shunt winding field coil and the high output drive by energizing the direct winding field coil changes the current value by the resistance element inserted in series in the motor drive power supply circuit. Although the change is detected automatically, the displacement of the relative position between the driver drive block and the staple magazine is detected, and the detection signal is input to the controller to switch the switching elements Tr5, T5.
You may turn on and off r6.

FIG. 7 is a time chart showing the operating state of the electric drive system.

As described above, when the DC compound winding motor is used as the drive source, the shunt field coil is energized to drive at high speed and low output when the staple magazine is in a low load until it comes into contact with the material to be stapled. When a high load is applied to the stapled material by hitting the stapled material, the series winding field coil is energized to drive at a low speed and high output. By energizing the shunt field coil to drive at high speed and low output, and controlling the drive current of the electric motor, it is possible to improve the efficiency of staple binding processing with a simple mechanism.
You can speed up your work and reduce power consumption.

[0035]

According to the first aspect of the present invention, the electric motor, which is a power source, is driven at a high speed and a low output when the load is low, and at a low speed and a high output when the load is high, so that the reduction ratio of the speed reducer is increased. Since it is not necessary to constantly drive in response to a high load, it is possible to speed up the stapling work per time, and since it is not necessary to drive the electric motor for a long time, battery consumption is suppressed and The charge per hit can significantly increase the throughput of clinch work.

According to the second aspect of the present invention, the electric motor, which is the power source, is composed of a DC compound winding motor, and the shunt winding field coil and the series winding field coil are selectively energized depending on the size of the load. Thus, high-speed driving can be performed when the load is low, and high-output driving can be performed when the load is high, and the efficiency of the staple binding process can be improved with a simple mechanism, and the work speed can be increased and the power consumption can be suppressed.

[Brief description of drawings]

FIG. 1 is a side view of a stapler according to the present invention.

FIG. 2 is a bottom view of the stapler.

FIG. 3 is a sectional view of a main part of the stapler.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

5 is a sectional view taken along the line YY of FIG.

FIG. 6 is a circuit diagram of an electric drive device.

FIG. 7 is a time chart for explaining an operating state of the electric drive device.

[Explanation of symbols]

 2 Clincher 5 Driver 7 Staple magazine 8 Screw shaft 10 Staple 30 Reducer 31 Electric motor 32 Motor drive control unit 41 Shunt winding field coil 42 Series winding field coil

Claims (2)

[Claims] 1. The output of an electric motor is taken out as a rotational force of a screw shaft through a speed reducer, the staple magazine is brought into contact with a material to be bound by the rotation of the screw shaft, and then a driver is driven to supply the staple magazine from the staple magazine. A stapler for ejecting the formed staples toward a clincher and for binding the stapled material, wherein the electric drive is used from the time when the staple magazine abuts the stapled material until the driver ejects the staples and completes the binding. A drive control unit of an electric motor that drives the electric motor at high speed until the staple magazine contacts the material to be bound and the staple magazine and the driver return to move after the staple is stopped by driving the motor at a high output. An electric drive device for a stapler, comprising: 2. The electric motor is constituted by a DC compound-winding motor having a shunt winding field coil and a series winding field coil, and a load of the electric motor is detected by a sensor, and the control section controls the sensor. Based on the detection result, the direct winding field coil is energized at the time of high load from when the staple magazine abuts the material to be bound until the driver drives out the staples and completes the stapling stop,
At the time of low load until the staple magazine comes into contact with the material to be bound and until the staple magazine and the driver return to move after the completion of stapling, the shunt field coil is energized to drive the electric motor. The electric drive device for a stapler according to claim 1, wherein the electric drive device is a stapler.