JPH01115578A - Driver - Google Patents

Abstract

PURPOSE: To eliminate the complicated start/stop of a motor for elongating the life of the motor by providing a control means for rotating the motor for driving a compressor at high speed on the basis of the output signal of a driving action detecting means, and when the driving action is not continued, for stopping the motor via a low-speed rotating state. CONSTITUTION: The rotating speed of a motor 32 for driving a compressor is controlled both by an air pressure monitored by a pressure sensor S, and by the timer incorporated in a voltage control circuit VC. In other words, when the air pressure is suddenly reduced from a set pressure by the driving work, a motor 32 is started at high-speed normal rotating speed No, and also a timer is started. When the air pressure is again suddenly reduced within the time T1 counted by the timer, the timer is restarted at that time. When the T1 elapses without causing the sudden drop in the air pressure accompanied by the driving action, the operation of the motor 32 is changed over to a low speed N2 or to an intermediate speed N1 , and the motor 32 is stopped at the time the air pressure is returned to the set pressure after the elapse of a time Tr.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to a driving machine for driving driving members such as nails and staples, and particularly to a pneumatic driving machine using a battery as a power source.

[Background technology]

In addition to the electric type shown in Japanese Patent Publication No. 53-1947, hand-held driving machines that drive driving members such as nails and staples using a striking means include: 1. A pneumatic type is available in which the striking means is an air cylinder operated by air pressure supplied from a compressor. In this case, with a pneumatic type and a handheld type, it is not possible to use a high-capacity compressor due to its weight, so a factory air tank is usually provided, and when the air pressure in this air tank reaches a predetermined pressure, For example, the compressor is stopped, and when the air pressure in the air tank drops to a certain value, the compressor is operated again to compensate for the low capacity of the compressor and the battery that powers it. However, if a large capacity air tank is installed, the work efficiency will be very poor, so there is a big limit on the capacity of the air tank.As a result, the air pressure inside the air tank fluctuates greatly during driving work, and the compressor has to be turned on and off. was frequently repeated. An example is shown in FIG. The middle part of the figure is the first generation when the drive was performed. As shown in Figure 6, driving work is generally done in a pattern where the light is turned off several times at a certain point of failure, and then the work is repeated several times at a different location. It is activated when the air pressure drops, and then stopped when the air pressure returns to the set pressure at the beginning of the movement, and is activated again to drive the compressor when the driving operation is performed at the next location. Since the motor is repeatedly turned on and off, there are problems with shortening the life of the motor, and problems such as pulsation and chatter of the pressure switch that monitors the air pressure in the air tank. From this point of view, there is also the problem that battery consumption is large.

[Purpose of the invention]

The present invention has been made in view of these points, and its purpose is to provide an air tank with a small capacity.
To provide a driving machine which can extend its life by reducing the load applied to a compressor and a compressor driving motor.

[Disclosure of the invention]

Accordingly, the present invention provides a driving machine equipped with a striking means for driving a driving member using air pressure supplied from a compressor driven by a motor, and includes a detection means for detecting a driving operation, and a detection means for detecting a driving operation. The compressor drive motor is characterized by having a control means that rotates the compressor drive motor at high speed according to an input and then stops the motor after passing through low speed rotation. When the motor is not operated continuously, the motor is not stopped from a high-speed rotation state, but is stopped after passing through a low-speed rotation state. The present invention will be described in detail below based on illustrated embodiments.
The embodiment shown in FIGS. IJ1 to FIG. 4 uses a nail as the driving member 9, and as shown in FIG. B1
It also includes a hose 30 that connects the two. As shown in FIG. 1, the main body part A includes a head part 1 having a /glue 15 protruding from its tip, a handle part 2 having one end connected to the side surface of the head part 1, and a /glue on the head part 1. 15 and a magazine 4 connected to the other end of the handle portion 2 and leaving a space between the handle portion 2 and the handle portion 2. The head part 1 has a sillage-11 inside a hollow hashing 10.
A piston 12, which is integrally provided with a striker 13 whose tip is positioned within the nozzle 15, is slidably housed in the sill 11. A damper 19 through which the striker 13 passes is installed at the opening at the lower end of the shilling 11, and the upper i opening of the silling 11 is slidable vertically in the figure and is attached downwardly by a spring 61. A damper 18 that can be freely opened and closed by the movable plate 14 that is biased, and that penetrates the movable plate 14
is located. Furthermore, a space is formed between the outer circumferential surface of the cylinder 11 and the inner circumferential surface of the housing 10, and this space is divided into two chambers, an upper and a lower chamber, and the upper air tank 16 is connected to the handle portion, which will be described later. The lower return air tank 17 communicates with the lower part of the sill 11 through communication holes 71 and 72. One end is integrally connected to the upper end of the head part 1, and a hose 30 is connected to the other end. 1 handle part 2 is
The inside of the air tank 26 is used as the air tank 26, and a bird valve is installed near the head portion 1. A shaft 52 that moves upward in the figure against a return spring 51 by pulling a lever 50 installed on the outer surface of the handle portion 2, and a piston 5 formed at a distance from the shaft 52.
3.54 is a trigger pulp chamber consisting of a cylinder part 55 sliding on the inner surface, an air chamber 6 formed between the upper end of the housing 10 of the head part 1 and the upper surface of the movable plate 14;
The cylinder part 55 is provided with a control vent 56.57 which communicates the air flow through the space between the two pistons 53.54 in the pongee 52 to the air tank 16.26. The large diameter space at the upper end of the cylinder part 55 is located at the exhaust hole 7.
It communicates with the external space at 5. The magazine 4 stores a large number of driving members 9 connected by a connecting member such as a wire 90, and includes a feeding member (not shown) for feeding the driving members 9 to the nozzle 15. ing. On the other hand, the compressor part B has a built-in compressor 5 and a driving member for the compressor 5, as shown in FIG. configured,
The driving members include a removable pack-type battery 31, a motor 32, and a gear 33 that reduces the output of the motor 32.
34, 35, a crank 36, and a connecting rod 37 that connects the crank 36 and the piston 23. Also, inside the compressor part B, there is a pressure sensor S connected to a part of the compressor 5 on the hose 30 side from the exhaust valve via a hose 38, a voltage control circuit VC, a motor drive element FET, and a switch SW. As shown in FIG. 5, the motor drive element FET is placed under the control of a voltage control circuit VC that outputs a voltage according to the input from the pressure sensor S, and controls the rotation speed of the motor 32. It is meant to be controlled. Next, the operation of the main body part A, which is operated by air pressure supplied from the compressor part B, will be explained. When the air tank 16.26 is filled with high-pressure air, a control vent 57 is also provided in the air chamber 60 provided at the upper end of the head portion 1.
．． Since air is being fed through the cylinder 56, the movable body 14 is moved downward under the force of the bone 61, and the upper end of the cylinder 11 is in an engaged state. Now, if you pull the lever 50 with your hand holding the handle part 2 (and thereby move the shaft 52 upward), one piston 53 will be moved to the upper large diameter part of the cylinder part 55, as shown in FIG. At the same time, since the control vent hole 57 is closed by the piston 54, the air in the air chamber 60 is released from the control vent hole 56.
and exhaust hole 75 to the outside. As a result,
The movable plate 14, which is in contact with the high-pressure air in the F-tank 16.26 through the communication space 63 provided at the upper end of the air tank 16, is pushed up against the spring 61, and the high-pressure air in the air tank 16.26 is communicated. It allows entry into the upper space of the cylinder 11 through the space 63 , for which purpose the piston 12 is driven downwards by high-pressure air and drives the driving element 9 out of the nozzle 15 by means of the striker 13 . At this time, as the piston 12 descends, the cylinder 1
The air in the lower part of the air tank 1 is sent to the return air tank 17 and twisted. Then, when the lever 50 is released, the movable plate 1 is moved again so that the F-tank 16.26 and the air chamber 60 communicate with each other via the control vent hole 56.57 due to the return of the pongee 52.
4 moves downward due to the bias of the spring 61, closing the upper end opening of the cylinder 11 and the communication space 63, and communicating the upper space inside the cylinder 11 to the outside through the exhaust holes 74 and 73. Also, when the piston 12 descends, the air pressure stored in the return air tank 17 causes the piston 12 to move.
Return upwards. When the piston 12 is at its lowest position, the return air tank 17 communicates with the space above the piston 12 of the cylinder 11 through a communication hole 72, but its diameter is much smaller than that of the lower communication hole 71, and the piston He will not become a hindrance to 12's return. The communication hole 72 is provided to send air from the compressor 5 to the return air tank 17 when sufficient pressure is not stored in the return air tank 17. Next is the compressor part B, which controls the rotation speed of the motor 32 based on the air pressure value monitored by the pressure sensor S and a timer built in the voltage control circuit VC. That is, as shown in FIGS. 6 and 8, if the air pressure P suddenly decreases from the set pressure state by performing driving work, the motor 32 is started at a high normal rotation speed N, and the above-mentioned Start the timer. And when counted by this timer 1i11T1
If there is a sudden drop in the air pressure P again within that time, the timer is restarted at α, and when the time T has passed without a sudden drop in the air pressure P due to the driving operation, The motor 32 is switched to low speed N2 to medium speed N, the time Tr required for the air pressure P to return to the set pressure is lengthened, and the motor 32 is stopped when the air pressure P returns to the set pressure. At this time, time T is the cycle time (usually 0.3 to 0.5
The time Tr required for the air pressure P to return to the set pressure is the time required to change the location when performing multiple consecutive driving operations at different locations.
In other words, the rotational speed N, N2 of the motor 32 is set so that it is slightly longer than the travel time (usually 1 to 3 seconds). For this reason, in this driving machine, the motor 32 is started only at the start of driving work, and the motor 32 is activated only at the start of driving work.
The motor 32 is stopped only when the driving operation reaches a break, and the motor 32 is constantly rotating while the driving operation continues, although its rotational speed N changes. The return of the air pressure P to the set pressure is done when the rotational speed N of the motor 32 is at a low speed N to medium speed N2, that is, with little pulsation. Since a certain air pressure P can be detected accurately, so-called chatter is less likely to occur. The rotation speed N of the motor 32 may be controlled by continuously variable control or fixed, but the rotation speed N may be gradually decreased from a high speed rotation state. This is because the range of time required for movement to change the driving location is large as described above, which is preferable to control.Another embodiment is shown in FIGS. It is used only to detect that the set pressure has been reached and to stop the motor 32, and to detect that the driving operation has been performed, a sensor attached to the head section 1 detects the acceleration a that occurs when driving the driving operation. The motor 32 is rotated at high speed during a period when a large acceleration α is occurring and for a certain period of time T thereafter, and thereafter the air pressure P is set to the set pressure. The motor 32 is rotated at a low speed until the motor 32 reaches the maximum speed.In this case, as in the previous embodiment, the number of times the motor 32 is started and stopped is reduced. in,
Here, it is slidably provided at the tip of the /
A contact 7-40 that turns on the switch SWs detects that the driving operation has been performed, and when the switch SWs is turned on, the motor 3 is turned on.
At the same time, the switch SWs is turned off again within the required time T1 after the switch SWs is turned off.
If not turned on, the rotation speed of the motor 32 is lowered, and when the air pressure P reaches the set pressure, the rotation of the motor 32 is stopped. In this type of driving machine, the contact arm 40, which is often provided in order to prevent the driving member 9 from flying out even if the lever 50 is moved carelessly, is used. Of course, also in this embodiment, when the contact arm 40 is not pressed against the workpiece, the stopper 41 provided on the contact arm 40 functions as a safety device to prevent the lever 50 from rotating. are doing. In each of the above embodiments, the motor 32 is stopped by detecting with the pressure sensor S that the air pressure P has returned to the set pressure, but the motor 32 is stopped by using the timer. You can also have them do this.

【Effect of the invention】

As described above, the present invention includes a detection means for detecting a driving operation, and a control means for rotating a compressor driving motor at high speed based on input from the detection means and stopping the motor after rotating at a low speed. Therefore, during work in which driving operations are repeated within a short period of time, the motor is in a high-speed or low-speed rotation state, and the motor will not be stopped unless the driving operation continues for a long time. In addition, the motor does not have to start and stop frequently, which can extend the life of the motor, and it uses a battery as a power source to reduce the number of times the motor starts, which consumes a large amount of current. In some cases, the pressure can be measured accurately if the output of the pressure sensor is used to stop the motor because the battery consumption is low and the air pressure is increased slowly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main body in an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a part of the same compressor, Fig. 3 is a perspective view showing the same as the above in use, and Fig. 4 is the same as the above. A vertical cross-sectional view of the main body during the driving operation, Fig. 5 is a block circuit diagram of the same as above, Fig. 6 is a time chart showing the operation of the above, Fig. 7 is a characteristic diagram of the same as the above motor, and Fig. 8 is the same as the above. 70-chart, FIG. 9 is a perspective view of another embodiment, FIG. 100 is a Narofuku circuit diagram of the same as above, FIG. 11 is a time chart of same as above, FIG. Fig. 14 is a longitudinal sectional view of still another embodiment, Fig. 15 is a block circuit diagram of the same as above, Fig. 116 is a time chart of the same as above), MS17
The figure is a 70-chart same as above, and FIG. 18 is a time chart of the conventional example, where S is a pressure sensor, VC is a voltage control circuit, 5 is a compressor, and 32 is a motor. Agent Patent Attorney Ishi 1) Ai

Claims (5)

[Claims] (1) In a driving machine equipped with a striking means that drives out a driving member using air pressure supplied from a compressor driven by a motor, there is a detection means for detecting driving operation, and a compressor driven by an input from the detection means. A driving machine characterized by comprising a control means for rotating a drive motor at a high speed and stopping the motor after rotating at a low speed. (2) The driving machine according to claim 1, wherein the detection means is a pressure sensor. (3) The driving machine according to claim 1, wherein the detection means is an acceleration sensor. (4) The detection means is constituted by a safety device that detects contact of the driving machine with the workpiece into which the driving member is driven and allows the driving machine to perform the driving operation. The driving machine described in Scope 1. (5) The driving machine according to claim 1, wherein the control means includes a timer and uses the timer output to shift the rotational speed of the motor from high speed to low speed or from low speed to stop. .