JPH0414138Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for controlling the height of a hanging-type paint sprayer supported by a reciprocator.

(Prior Art) Conventionally, for example, when painting the upper surface of a vehicle body on a vehicle painting line, a painting apparatus as shown in FIGS. 4 and 5 has been used.

In these figures, 1 is a gate-type reciprocator, and a pair of columns 2 and 3 and these columns 2 and 3 are connected to each other.
It consists of an elevating body 4 supported so as to be movable up and down. Further, a coating machine 5 is attached to the elevating body 4 so as to be movable laterally. and reciprocator 1
has a built-in drive means for raising and lowering the elevating body 4, and is also provided with a height control device for controlling the operation of the drive means. , as indicated by the arrows, the sprayer 5 can be maintained at constant intervals.

Heretofore, as a height control device for controlling the height of the elevating body 4, there has been one disclosed in Japanese Patent Publication No. 61-12498. As shown in FIG. 6, this includes a drive sprocket 8 on which the chain 7 for driving the elevating body 4 is connected, a sprocket (rotating body) 9 connecting the chain 7, and a sprocket (rotating body) 9. Cam group 10 integrated with 9
, a switch group (not shown) provided opposite to the cam surface of the cam group 10, a pulse detection circuit 11 that detects the height position of the elevating body 4 based on the output signal from the switch group, A main circuit 13 that controls the operation of the motor 12 that is the drive source for the elevating body 4 based on the output signal from the pulse detection circuit 11.
It consists of. In the figure, 14 is a speed reducer, 15 is a passive sprocket on which the chain 7 is applied, 16 is a switch striker supported by the elevating body 4, and 17 and 18 are the striker 1.
6 respectively represent switches that are engaged with and detect the rising end and the descending end of the elevating body.

Here, the cam group 10 of the height detection circuit is formed of a plurality of cams having unevenness with different phases. For example, as is clear from the pulse signal shown in FIG. 7, when the number of cams is five, the height of the elevating body 4 can be detected at 32 points. That is, by using an encoder system using an alternating binary output code, it is possible to select 32 stopping positions for the elevating body 4.

(Problems to be Solved by the Invention) However, the height control method using the alternating binary output code has the following problems.

First of all, normally 5 cams are used and the total stroke is basically divided into 32 equal parts, so for example, if the stroke is 700mm, it will be 21.9mm per point, or if the stroke is 1000mm, it will be 31.2mm per point, and the painting data will be is difficult to configure. If the above-mentioned stroke is set, each point is 20 mm to 30 mm, and if the stroke is to be divided evenly into smaller pieces, it is necessary to increase the number of cams, which increases the size of the device and increases the cost.

Next time, when comparing with the setting data, for a short period of time (approximately
20msec), but a normal PC (program controller) may miss the police box binary code, making it cumbersome to use a microcomputer.

The present invention was made to solve the above-mentioned problems, and the purpose is to provide a height control device that has an extremely simple structure and can input and set painting data easily and with high accuracy. .

(Means for Solving the Problems) Therefore, the present invention provides a mechanism for converting the elevating body of the reciprocator that supports the hanging type paint sprayer into a rotary motion through a mechanism that converts the vertical motion of the elevating body into rotational motion. 2, which transmits two pulse signals having different phases to the rotating body in proportion to the rotation speed of the rotating body.
The gist is that a control section is provided which connects the signal pulse transmitters and further controls the operation of the driving means for the elevating body based on the output signals from the two signal pulse transmitters.

(Function) In the height control device for the hanging type paint sprayer having such a configuration, the vertical movement position of the elevating object can be detected by extracting the rotational speed of the rotating body interlocking with the elevating object using a two-signal pulse transmitter. By feeding this result back to the driving source of the elevating body,
The height of the paint sprayer supported by the elevating body can be controlled. By changing the rotation ratio of the rotating body with respect to the vertical movement of the elevating body, many pulses can be transmitted, and the height change position of the elevating body can be divided into fine sections. Furthermore, the driving direction of the driving means can be easily detected by transmitting two signal pulses, and malfunctions of the elevating body can be prevented.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

1 and 2 show the structure of the height control device of the present invention. The same components as shown in FIGS. 4 to 6 are designated by the same reference numerals.
The explanation will be omitted.

In these figures, reference numeral 19 denotes a two-signal pulse transmitter, which is integrated with a sprocket 9 connected to the drive sprocket 8 via a chain 7. Further, 20 is a pulse detection circuit for discriminating and reading the two-signal output from the two-signal pulse transmitter 19, and 21 is a main circuit incorporating a PC (program controller) for calculating the output of the pulse detection circuit.

As shown in FIG. 2, the two-signal pulse transmitter 19 is connected to the sprocket (rotating body) 9 and has an end cut out by 1/2 of the circumference and is fitted into the inner cylinder 22. It consists of a fixed outer cylinder 23 whose end is cut out by half the circumference, and switches 24 and 25 which are provided inside and opposite to the circumferential surfaces of the outer cylinders 22 and 23. Further, the inner cylinder 22 and the outer cylinder 23 are positioned such that the notch of the inner cylinder 22 protrudes from the notch of the outer cylinder 23, and the phases of the notches differ by 90 degrees. and the switch 24,
25 is in an ON state when the contact piece is in contact with the circumference of the inner and outer cylinders 22 and 23, and is in an OFF state when it is away from the circumference.

In the height control device configured in this way,
The elevating body 4 is normally located at the upper end, and the upper end switch 17 is turned on by the striker 16.

Now, the vehicle body 6 is connected to the portal reciprocator 1 (4th
When the machine start switch (not shown) of the automatic coating machine is activated using a trolley or the like, the main circuit 21 transmits the vehicle type information of the vehicle body 6 to the vehicle type detection device (Fig.). (not shown). Data such as height setting data and painting data are set in advance in the main circuit 21 for each vehicle type, and the paint sprayer 5 is controlled based on these data. When the machine start switch is turned on, the drive motor 12 is activated by a lowering command from the main circuit control section based on the height setting data, and the coating machine 5 is lowered together with the elevating body 4.

Simultaneously with the start of the descent of the elevating body 4, the sprocket (rotating body) 9 rotates and two-phase pulses are transmitted from the two-signal pulse transmitter 19.
Also, the striker 1 supported by the elevating body 4
6 leaves switch 17 at the same time as it descends, so
By the OFF signal of this switch 17, the main circuit 2
1 starts calculating the output pulse of the pulse detection circuit 20, and when it becomes the same as the setting data, a descending stop command is sent from the main circuit 21, the drive motor 12 is stopped, and the elevating body 4 is also stopped. However, since this height position is stored in the main circuit as the number of pulses, when moving to the next height set in the height setting data, the number of pulses at the stop position and the setting data are calculated in the main circuit 21. Then, a command to move the elevating body 4 to the next height position is sent to the drive motor 12.

Note that the main circuit 21 includes a two-signal pulse transmitter 19
The pulse signal from the drive motor 12 is compared with the height setting data, and if the difference with the setting data is large, the drive motor 12
It also has the function of outputting a signal for high-speed rotation, and outputting a signal for low-speed rotation if the difference is small.

By the way, when the elevating body 4 descends, the inner and outer cylinders 22, 2 connected to the sprocket (rotating body) 9
3 rotates to the left, and the switches 24 and 25 attached to the inner and outer cylinders 22 and 23 are rotated by 90°, with switch 25 being 90° wider than switch 24, as shown in FIG. 3a.
Sends a pulse with a delayed phase. On the other hand, when the elevating body 4 rises, the inner and outer cylinders 22 and 23 rotate clockwise, so that the switch 25 has a phase that is 90° ahead of the switch 24, as shown in FIG. 3b. Send a pulse. It has become possible to determine the moving direction of the elevating body 4 using the two-phase pulse signal transmitted as described above.

Note that the accuracy of height control can be increased by changing the rotation ratio of sprockets 8 and 9. For example, if the movement unit is set to 10 mm/pulse, a sufficient effect can be obtained during use. Also, in FIG. 2, a switch 24,
Two pulse signals having a phase difference can also be transmitted by arranging the pulse signals 25 shifted by 90° (any angle may be used) on the circumference. In this case, the outer cylinder 23 can be omitted.

(Effects of the invention) As described above, the present invention uses a two-signal pulse transmitter to extract the rotational speed of the rotating body interlocking with the elevating body, so that the vertical displacement of the elevating body can be calculated per pulse.
It can be set arbitrarily by simply changing the rotation ratio of the rotating body, and as a result, it has become possible to precisely control the height of the drooping type paint sprayer. Also, since it makes full use of two pulse signals, the signal path is simplified, and it can be operated with a program controller without using a microcomputer. Furthermore, compared to the alternating binary cam group, reliability is improved because it has an extremely simple configuration with almost no cam adjustment or limit adjustment.

[Brief explanation of drawings]

Figure 1 is a system diagram of the height control device using two pulse signals of the present invention, Figure 2 is a perspective view showing an example of the structure of a two-signal pulse transmitter, and Figures 3a and b are two-signal pulse transmitters. Fig. 4 is a front view of the coating device, Fig. 5 is an explanatory diagram showing the vertical displacement of the elevating body, Fig. 6 is a system diagram of a conventional height control device, Fig. 7 is a timing chart showing the output of the alternating binary cam group. 1...Reciprocator, 4...Elevating body, 5...
Painting machine, 9...Rotating body, 19...2 signal pulse transmitter.

Claims (1)

[Scope of utility model registration request] The elevating body of the reciprocator that supports the hanging type paint sprayer is connected to the rotating body through a mechanism that converts the vertical movement of the elevating body into rotational motion, and the elevating body of the reciprocator that supports the hanging type paint sprayer is connected to the rotating body, and the elevating body is connected to the rotating body in proportion to the rotation speed of the rotating body. 2 with different phases
The invention is characterized in that a two-signal pulse transmitter that transmits two pulse signals is connected to each other, and further includes a control section that controls the operation of the driving means for the elevating body based on the output signal from the two-signal pulse transmitter. Height control device for hanging type paint sprayer.