JPS59219171A - Electromotive driver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an electric screwdriver.

(Background technology) Tightening screws using a conventional electric screwdriver (1LJ speed)
A speed variable mechanism that can vary the speed and a torque IJ variable mechanism are known, and a Herc management system for linen tightening is also used.

However, for this;
l with pitch etc. taken into consideration! If has no configuration or means, simply tighten the screw f=l at a speed of 4 and a torque of 1 to ijJ
It was a little strange that it would change. For this reason, in the past, even when a screw was tightened by IJ, the tightening speed was maintained due to inertia. Jlj could not be i).

[Disclosure of the invention]

An object of the present invention is to provide an electric screwdriver that can perform screw tightening work with high precision.

The present invention detects the number of rotations of a DC motor that is stopped and calculates the number of rotations, the length of the screws to be tightened, the structure and X of the screws, etc.
Compare the data data signals based on the data related to method J, and just before the screw tightening is completed, control the drive circuit for driving the DC motor to reduce the rotational speed of the DC motor, and at the same time,
The torque of the DC motor from the drive circuit is compared with the set 1-lux of the screw to be tightened, and when the 1-luke of the DC motor becomes equal to or larger than the set 1-luke (
``Stopping the driving of the drive circuit and tightening the screws'' () is completed, thereby tightening the screws with a constant torque.

(BEST MODE FOR CARRYING OUT THE INVENTION) Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

The electric screwdriver related to this light is small in the drawing! JJ, sea urchin,
A driver main body 1 is provided. This driver main body 1 consists of a DC motor 2, a gear X7 box 3 mounted on the shaft 1 to one end of the motor 2, and a gear X7 box 3 mounted on one end of the motor 2.
It has pins 1 to 4 which are rotated through a box 3.

A drive current is supplied to the DC motor 2 from a drive circuit 5 .

A disc 7 with a slit is attached to the other end of the shaft of the DC motor 2, and a light emitting diode (LED) 8 and a small detector 9 are mounted with this disc 7 in between. It is located. These disks 7, L[D8 and body detector 9 form a detector 6 consisting of a pulse cone: 1-da for detecting the rotation of the motor 2. ]
・The counter 1 is connected to the detector 9 via the detection amplifier 10.
1 is connected. The counter 11 calculates the number of pulses generated by the circle & 7 pulses sent from the detector 9 to the small 1, and gives this 51 value to one side of the feed rate comparator 12. The other input of the quantity comparison 'a12 is connected to a data setter 14 via a multiplexer 13.This data setter 14 inputs data regarding the lengths, pitches, etc. of multiple screws (1°4 construction/dimensions). is registered and the data corresponding to the screw to be pulled is selected by sequence 1 (described later) (control unit) 19, and the feed chain is selected by the feed chain comparator 1 based on the data.
2 to the other input. The feed amount comparator 12 compares this 1-day value with the counted value of the counter 11, and outputs a normal speed selection control signal while the 81 value is smaller than the data, and when the fil value becomes larger than the data. Outputs a low speed selection control signal at this point. Note that the above-mentioned -J゛-Y is predetermined from data such as the length and pitch of the screw so that it corresponds to the number of rotations until the screw tightening of the DC motor 2 is completed. .

The normal speed selection control signal and the low speed selection control signal are input to the speed switch 15 manually. This speed switch 15 switches to two stages of these (normally 3 when the Fi number is input) 18 and low speed, and sends a normal speed signal or low speed to the drive circuit 5 via the Ij direction switch 1G. (H>IS is output. Therefore, the DC motor 2 is normally decelerated due to continuous failure and rotates at a low speed. The other output of the drive circuit 5 is a torque comparator 17.
is connected to the comparator 17, and an l-lux setting device 18 is connected to the comparator 17.

This 1-torque setting device 18 has a preset 1-torque for the screw to be tightened, and outputs a 1-luke control signal when the torque detection signal from the drive circuit 5 exceeds the set torque value. Hiru. This 1 to 1 torque control signal g is input to a sequencer 19 as a control section.

The sequencer 19 outputs a stop command signal to the drive circuit 5 upon receiving this signal. The sequencer 19 also outputs a control signal to the direction switch 16 to switch the switch 16 to forward or reverse rotation, and to switch the drive circuit (direct current).
2 is called forward rotation drive or reverse rotation drive J-ru.

Next, the operation of the electric screwdriver of this invention will be explained.

Tightening is performed by manually inputting a start signal to the sequencer 19 from the outside, and one sequencer is used to control the direction changer 16 with the control input f, 3.
and output j′-all selection to the data setter 14],
- Outputs a bow. The data setter 14 inputs ilt ('J kj data of screw to be fed amount ratio axis type' + 20) to one input by this manual input. Feed m comparator 1
2 has the output of the counter 11 given to the other input, and compares it with the data. Initially, since the setting data is more sensitive, a normal speed selection control signal is output to the speed switch 15. Therefore, since the speed switch 15 outputs the normal speed signal to the drive circuit 5 via the direction switch 16, the DC motor 2
is rotated at normal speed and tightens the screw through the bit 4.

When the DC motor 2 rotates, the disc 7b of the detector 6 rotates L.
, LEI) 8 and a photodetector 9, the rotation of the motor 2 is converted into pulses, and these pulses are sequentially converted to a counter 11.
It will be improved by. Then, when the number (target) of the counter 11 is manually entered into the feed m comparator 12, and the value of 81 is equal to or greater than the data of the setting device 14 just before the completion of the screw, the feed crucible ratio axis type 12 outputs the low speed selection control No. 13 to the speed switch 15, so this switch 15 switches to (IL 3fl! Maro rotation) and sends the low speed signal to the drive circuit 5 via the direction switch 1G. Therefore, the rotational speed of the flow controller 2 is reduced just before the screw tightening is completed.

In this way, when the DC motor 2 is driven to a low speed and its inertia becomes small, the drive circuit 5 sends a signal to the 1-lux comparator 17 as the screw tightens (IJ). The detection signal does not show increasing torque at 1:J. Then, the torque comparators 1 to 1'7 output a torque control signal to the sequencer 19 at the same time that the actual tightening torque of the screw indicated by this detection signal becomes smaller than the set torque value of the torque regulator 18. Therefore, the drive circuit 5 is stopped by the stop command signal from the sequencer 19.

As a result, since the DC motor 2 is rotating with small inertia, its rotation, that is, the screw tightening operation is stopped at the time of vIA. Sequence 19 +, i After that, the tightening of the screws on the outside is completed r (++ day is output.

” In the second embodiment (I
5"1, Direction switch 1 by control signal of sequence 19
6 to reverse rotation, and the drive circuit 5 drives the DC motor 2 in the reverse direction +1IIJ-! J-ru. After that, the feed m comparator 12
etc. perform the same operations, so the screw tightening and loosening work can be controlled in exactly the same way.

In addition, to temporarily tighten the screws, as shown in the drawing,
The data setting device 20 for temporary tightening is connected to the feed rate ratio axis type 12 via the multiplexer 133, and the feed rate ratio axis type 1
Low losing streak selection control from 2 (I number 7 sheets 4
All you have to do is directly input it to J-19 and compare the torque of the drive circuit 5. Stop F on the 19th floor of Moe.

If the speed selection control signal from the feed comparator 12 is changed in multiple steps, and the speed switch 15 is also changed in multiple steps accordingly, the screw threading operation can be performed with even higher precision.
I can become.

Data setter 14.20 and multiplexer 13 are R
It is more efficient to realize it with OM etc. and switch the power from the outside with (F: 743).

As explained above, if Honkomei is J, then Neji no Tsumugi is]
Immediately before the completion of tightening or loosening the screw, the rotational speed of the DC motor is increased to g, and at the same time, the setting tightening speed ζH is obtained by 1 herk. Since its inertia is small, it can be stopped in a country 11i'l. Therefore, it is possible to perform precise screw tightening work.

[Brief explanation of the drawing]

The drawing is a circuit configuration diagram of an electric driver according to the present invention. 2...DC sweater, 5...Drive circuit, 6-...Detector, 11...Counter, '12...Feed ■Comparison Device, 14.20... Data setting device, 15-...
・Speed switch, 17...1~Luke comparator, 1B...L-Lux setting device, 19...Jikun→No. Applicant 1” Hondenki Seiki Co., Ltd. Agent Patent Attorney Takeo Masuda

Claims (1)

[Scope of Claims] 1. There is an electric driver C having a DC motor for driving the rotation of the driver and a drive circuit for driving the DC motor, and outputs a stop rotation or reverse rotation command signal to the drive circuit n0. A direction changer that detects the rotation of the DC motor, a detector that detects the circulation of the DC motor, a counter that counts the number of rotations of the DC motor by 81 based on the detection signal from the detector, and the structure and dimensions of the screw to be tightened. a data setter in which data is registered; a signal output corresponding to the data from the data setter;
Compare the count output from the Q counter and compare 11Ti
a feed amount comparator that outputs a selection control signal according to the feed amount comparator; and a speed changer that outputs a speed switching signal to the drive circuit in order to change the rotational speed of the Shirataki motor in response to input of the selection control signal from the feed comparator. The tightening device (= tightening of the screw that should be tightened ζJG) l ~ the torque setting device with the silk setting, the torque setting signal from the 1- torque setting device and the 1- from the drive circuit. When the 1-lux of the self-current motor exceeds the setting 1-luq or more, 1
- the feed amount comparator outputs the feed amount comparator, etc., the feed amount comparator, etc. An electric screwdriver comprising: a control unit that outputs a stop command signal to the drive circuit to stop the drive circuit.