JPH02476Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to an automatic knitting tape cutter, and in particular detects the twisting of the fabric fed from the turntable and automatically releases the twisting. Relating to an anti-twist device.

<Prior Art> A tape cutter for making a tape by rotating a tubular knitted fabric and cutting it spirally from the end is conventionally known (see, for example, Japanese Patent Publication No. 35307/1983). To briefly explain the structure of this tape cutter, a turntable on which a cylindrical knitted fabric is placed and its driving device are installed at the bottom, and above it is a drive device that stretches the fabric pulled up from the turntable into a cylindrical shape. In addition to the drum and driven drum, there is also a widening drive roller that presses the fabric from the outside, a sliding plate,
and a pair of rotating blades that continuously cut the stretched fabric. The motor of the turntable is normally controlled at a constant speed by a speed change circuit using a tachogenerator system.

<Problem to be solved by the invention> If the above-mentioned constant speed control using the tachogenerator method was performed well, even if the weight of the fabric on the turntable gradually becomes lighter during operation, the turntable will still be able to move around the area of the fabric. It should not be so fast or slow that it causes twisting. However, in reality, twisting occurs due to various reasons, and if this twisting is left untreated, it will eventually impede the smooth feeding of the fabric and cause inconveniences such as uneven tape cut widths. They went out of their way to have a worker on duty to monitor the turntable and adjust its rotation if any twisting occurred.

The purpose of this invention is to enable automatic untwisting.

<Means for solving the problem> In this invention, the following two switches are connected in parallel to the above-mentioned speed change circuit.
One switch is a micro switch installed inside the turntable where the cylindrical knitted fabric is stretched between the driving drum and the driven drum, and a sensing rod is attached to the operating arm of this micro switch. When this sensing rod is pushed by the twisting of the dough, it turns off and opens the speed change circuit.
Normally, it is in the on state and closes the above-mentioned speed change circuit. The other switch is a manual release switch that is normally left in the off position.
If the fabric is untwisted too much and twists in the opposite direction, turn it on when it is necessary to correct the untwisting.

<Example> This invention will be described below using an example shown in the drawings.

In the automatic knitting tape cutter shown in FIG. The dough 2, which has been stretched out between 6 and 6, is cut into a tape shape with a pair of cutting blades 7, but the difference from the conventional method is that a micro switch 9 is attached to a mounting arm 8 whose one end is fixed to an appropriate location.
is fixed, and the sensing rod 10 is attached to the operating arm of the micro switch 9, and the manual release switch 1
1 is provided.

As clarified by the electrical connection diagram shown in FIG. 2, the micro switch 9 and the manual release switch 11 are connected in parallel to the speed change circuit, and under normal circumstances, the device release switch 11 is in the OFF state. On the other hand, the micro switch 9 for detecting fabric twist is in an on state, closing the speed change circuit.

Next, to explain the operation of this device, after adjusting the speed of the turntable 1 to be slightly slower than the speed of the drive drum 3 by turning the knob 12 of the speed setting potentiometer, operation is started. When the cloth 2 lifted from the turntable 1 is twisted and compressed into an inverted conical shape, the sensing rod 10 is pushed by the cloth and turns off the micro switch 9, so the speed change circuit is opened and the turntable 1 rotates at high speed to untwist the dough 2. When the sensing rod 10 returns to its original position as the fabric 2 is untwisted, the micro switch 9 is turned on and the turntable 1 returns to its original normal rotation again. This operation is repeated to achieve automatic twist prevention.

During operation of this device, if the fabric is untwisted too much and twists in the opposite direction, the worker presses the release switch 11 to turn on the fabric that was previously off. As a result, the speed change circuit can be closed, so that the turntable 1 can be rotated normally and the excessive return can be corrected.

As mentioned above, the speed of the turntable 1 is adjusted slightly slower than the constant rotational speed indicated by the drive drum 3, but if it were to be adjusted slightly earlier, the micro switch 9 would be turned off. As a result, the turntable 1 rotates faster and faster, resulting in extreme twisting, as if a cloth had been squeezed, and the twisting cannot be released.

<Effects of the invention> Previously, it was impossible to unravel for 15 minutes after the start of operation, but with this invention, it is possible to automatically prevent twisting so that there is no problem even if it is left unraveled for a long time. Therefore, it is possible to significantly reduce the labor of the worker, and there is no unevenness in the tape cut width, reducing loss. Furthermore, it is extremely effective from a practical standpoint, as it can be easily attached to existing equipment and requires almost no maintenance.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of this invention;
The figure is an electrical circuit diagram of a turntable motor. 1... Turntable, 2... Tube knitted fabric, 3
... Drive drum, 4 ... Driven drum, 9 ... Micro switch, 10 ... Sensing rod, 11 ... Release switch.

Claims (1)

[Scope of utility model registration request] Motor M equipped with a speed change circuit based on the tachogenerator system
In the tape cutter that rotates the turntable 1, the cylindrical knitted fabric 2 on the turntable 1
A micro switch 9, which is normally in the on state, is provided at the inner part of the frame suspended between the driving drum 3 and the driven drum 4, and a sensing rod 10 is attached to the operating arm of the micro switch 9. When the sensing rod 10 is pressed by the torsional deformation of the fabric, it turns off, and the micro switch 9
and a fabric twist prevention device for a tape cutter comprising a manual release switch 11 connected in parallel to the speed change circuit.