CN1095749C - Belt drive unit of screen print works - Google Patents

Abstract

The present invention relates to a belt drive device of a screen printing machine, which is provided with a control unit (7). The present invention is characterized in that An initial setting value can be inputted and stored in a memory (73) by a length setting device (70), a current drive revolution value conveyed by row programming units (3, 13) is counted, and the current drive revolution value and a deviation value of the initial setting value stored in the memory (73) are compared with a deviation counter (74). AC servo motors (5, 15) are driven in a compensation mode according to the value of a deviation amount, and thereby, printing quality is improved.

Description

Belt drive unit of screen print works

The present invention relates to belt drive unit of screen print works, in more detail, the present invention relates to the belt drive on the high-precision screen decorating machine.

The multiple device of the screen decorating machine of printed patterns on fabric etc. is disclosed at present, all automations of most stamp operation, and used the automatics that drives belt for this automated job.

At present, for the belt that drives silk screen has utilized the belt of the driving wheel driven by servomotor of being used by unidirectional drive, this belt moves printing table and supply with fibrous material on printing table.But, in this structure, owing to only use single driving driving wheel, and, because the caused belt of variations in temperature is flexible, or the amount of movement that caused of thickness of belt inequality changes and because of can not correctly carrying by the length of setting that the mechanicalness backlash is caused, therefore, cause correctly stamp, produce problems such as printing quality is not good.

Consider the problems referred to above, the object of the present invention is to provide a kind of belt drive unit of screen print works that can eliminate the problems referred to above, this device can correctly be measured and compensate feeding amount ground and drive belt at two ends simultaneously.

In order to finish above-mentioned purpose, belt drive unit of screen print works of the present invention has the device that the programming that drives linkedly with each driven roller is measured roller and realized its compensation.

Belt drive unit of screen print works according to the present invention comprises: the driven roller that is positioned at two ends that drives belt, drive the AC servomotor of above-mentioned driven roller, the winding number of above-mentioned AC servomotor is transformed into digital information, flow to the converter of control module then respectively, the programming roller and the control module that fuse with above-mentioned driven roller and the information and the signal of relevant driven roller winding number flowed to capable programming unit; It is characterized in that

Above-mentioned control module comprises: use the outside length setting device that device carries out length setting of keying in, the multiplying power setting apparatus that the revolution information of the digital value that will be carried by the row programming unit is at random amplified, counter, the deviation counter, storage is by the memory of the initial set value of length setting device setting, digital to analog converter, analog digital converter, and drive circuit; Count driving revolution numerical value the now of being carried by the above line programming unit, with the deviation counter itself and the deviate that is stored in the setting value in the memory are compared, according to the size of this departure, compensation ground drives the AC servomotor.

Below, with reference to accompanying drawing, illustrate in greater detail belt drive unit of screen print works of the present invention.

Fig. 1 is the structured flowchart that explanation belt drive unit of screen print works of the present invention constitutes;

Fig. 2 is the structured flowchart of the control module of expression belt drive unit of screen print works of the present invention.

In the structured flowchart (Fig. 1) that expression belt drive unit of screen print works of the present invention in summary ground constitutes, belt 10 as the stamp operation post is installed between the driven roller 1 and driven roller 11 at two ends, stretch tight and be enclosed within on these two driven rollers, and, be the rubber system belt of a hard with the driven roller rotation.

Among the figure, the 9th, be used for the silk screen unit 20 of stamp.The Ac servomotor 5,15 that drives each driven roller 1,11 drives driven roller 1,11.Assembled reductor 4,14 between driven roller 1,11 and AC servomotor 5,15, the revolution of AC servomotor 5,15 is transformed into data signal by converter 6,16, and gives control module 7 respectively with it.

The programming roller 2,12 that fuses with driven roller 1,11 and rotate reads the information relevant with the revolution of driven roller 1,11, and gives row programming unit 3,13 with this information conveyance, and then with the information digitalization relevant with this revolution, flows to control module 7.Because the multiple pulse measurement device of this read method and encoder etc. is relevant, therefore, this prior art is not described in detail herein.

Control module 7 is shown among Fig. 2.

This control module 7 comprises: use the outside length setting device 70 that device carries out length setting of keying in, will be by row programming unit 3, the multiplying power setting apparatus 71 that the winding number information of 13 digital values of carrying is amplified arbitrarily, counter 72, deviation counter 74, storage is by the memory 73 of the initial set value of length setting device setting, digital to analog converter 75, analog digital converter 76, and drive circuit 77.

The driving revolution numerical value of the now of being carried by row programming unit 3,13 flows to counter 72 after multiplying power setting apparatus 71 amplifies.With deviation counter 74 this numerical value and the setting value that is stored in the memory 73 are compared, and this departure is transformed into the analogue value, add AC servomotor 5,15 offset, should compensate winding number and feed back to drive circuit again, this compensation is carried out repeatedly, up to being turned back to the offset that calculates.

The computational methods that are input to the initial stage length settings in the length setting device 70 are as follows:

The umber of pulse of the capable programming unit 3,13 that rotates a circle with respect to AC servomotor 5,15 is called P, the winding number of the roller that rotates a circle with respect to AC servomotor 5,15 is called DR, and the belt amount of movement that AC servomotor 5,15 rotates a circle is called L, then

L＝π(D+T/2)*DR

T herein is the mechanical amount of movement of thickness of belt with respect to a pulse of row programming unit 3,13 $L=\frac{\mathrm{\π}\×(D+T/2)}{P}\×\mathrm{DR}$

If add the initial length setting value, be set at mechanical each variable value of compensation integral, so, can on correct position, carry out operation for a long time.

The belt drive unit of screen print works of the invention described above drives two driven rollers and rotates, with existing The mode of single drive roller is compared, and the precision of belt drive unit of screen print works of the present invention very High.

Claims (1)

1, a kind of belt drive unit of screen print works, this drive unit comprises: the driven roller that is positioned at two ends (1 that drives belt (10), 11), drive above-mentioned driven roller (1,11) AC servomotor (5,15), the winding number of above-mentioned AC servomotor (5,15) is transformed into digital information, flows to the converter (6 of control module (7) then respectively, 16), fuse with above-mentioned driven roller (1,11) and the information and the signal of relevant driven roller (1,11) winding number flowed to capable programming unit (3,13) programming roller (2,12) and control module (7); It is characterized in that

Above-mentioned control module (7) comprising: use the outside length setting device (70) that device carries out length setting of keying in, will be by row programming unit (3,13) the multiplying power setting apparatus (71) that at random amplifies of the revolution information of the digital value of Shu Songing, counter (72), deviation counter (74), storage is by the memory (73) of the initial set value of length setting device setting, digital to analog converter (75), analog digital converter (76), and drive circuit (77); To by above line programming unit (3,13) drive revolution numerical value the now of carrying and count, with deviation counter (74) itself and the deviate that is stored in the setting value in the memory (73) are compared, according to the size of this departure, compensation ground drives AC servomotor (5,15).

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