JPS6145478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control method and device for sewing material, and a completely new sewing means that controls the position of the material to be sewn at the entrance of the sewing machine and eliminates tension applied to the material during sewing. It provides:

On an automatic sewing line using a sewing machine, it is necessary to accurately guide and feed the line that performs the required sewing to the sewing machine needle position.Therefore, it is necessary to guide the fabric according to the straight shape, curved shape, and various sewing specifications. Needed. On the other hand, when sewing stretchable fabrics such as knitted knitted fabrics, if excess tension is applied during the feeding of the fabric, it will result in poor stitching, especially when stitched together with fabrics fed by other means of supply, such as Latsupa fabrics. In such cases, sewing defects are likely to occur due to tension differences. Therefore, there is a need for position control and supply means that are as free from tension as possible.

Conventionally, there are methods developed for such purposes, such as those using compressed air blowing and guidance, guide rulers, control rollers, etc. However, with such methods, accurate fabric edge control is difficult. However, unlike control in a stationary state, it is almost impossible to control the sewing speed of an automatic sewing machine to follow the sewing speed, and even if this is done forcibly, there will be problems such as unsewn stitches due to poor control and double stitches due to tension addition. produce defects. The present invention eliminates such conventional drawbacks and provides a completely new means that is equivalent to manual work performed by sewing workers without defective sewing, and greatly contributes to rationalization and labor saving.

In other words, its basic feature is that when the material to be sewn is being fed by the sewing machine feed dog, the material is left in a free state, while when the material is not being fed,
This is nipped to correct the predetermined position of the edge of the fabric, and this operation is performed by automatically detecting the cycle of continuous needle movement.

The details will be described below.

Normally, the sewing mechanism in a sewing machine is driven by a driving source (not shown), as in the flat twin needle sewing machine illustrated in Fig. 1.
The power from the machine is received by the pulley 1 via a belt etc., and the rotation of this is converted into the vertical movement of the sewing machine needle 2 and the feed of the sewing machine feed dog 3. 3 and 3 are interlocked with each other, and their relationship, including various sewing machines such as lower tooth feed, upper and lower tooth feed, needle feed, and general feed, is as shown in the operation explanatory diagram of FIG.

That is, the sewing machine needle 2 repeats upward and downward movements, and the feed dog 3 repeats a substantially elliptical movement. During this operation, while the material is being fed by the feed dog, the sewing machine needle rises, When the feed dog does not feed the fabric, the sewing machine needle reciprocates in the fabric to form a stitch loop. That is, sewing progresses by sequentially performing stitch formation → fabric feeding → seam formation → fabric feeding, but the present invention allows sewing to be carried out through gaps in the sewing cycle. The purpose is to control the sewing material. The configuration will be explained below based on the drawings illustrating the configuration.

Figures 2 to 4 illustrate an example of the device of the present invention, where Figure 2 is a plan view thereof, Figure 3 is a front view of Figure 2, and Figure 4 is a cross section taken along line A-A in Figure 3. Figures are shown respectively. In this figure, the sewing machine throat plate 4 shown in the second figure
An edge guide 6 is provided on the sewing machine table 5 in front of the sewing machine table 5 (the presser foot is not shown in both FIG. 1 and the same figure) so as to intersect with the traveling direction of the fabric a. That is, the edge guide 6 has an arm 7 as a base, on which a timing pulley 8 and idler pulleys 9 and 10 are provided, and a timing belt 11 is stretched around the arm 7. On the other hand, the upper side of the arm 7 has a semicircular shape, and a gear 12 is provided thereon and engaged with a gear 13.
The gear 13 is connected to a stepping motor 15 (hereinafter referred to as SM1) via a bracket 14, and the timing belt surface approaches and separates from the sewing machine table 15 surface as the SMs 1 and 15 rotate. On the other hand, a stepping motor 1 is used to rotate the timing belt 11 in forward and reverse directions.
6 (hereinafter abbreviated as SM2) is the bracket 14
and an arm 7, which is connected to a timing pulley 8 via a shaft 17, and receives forward and reverse rotation of the SMs 2 and 16 to rotate the timing belt 11. Note that the shaft 17 also serves as a fulcrum for the arm 7, which rotates in response to the rotation of the SMs 1 and 15. On the other hand, the sewing machine table 5
A reflective photosensor 18 is installed to detect fabric edges.
(hereinafter abbreviated as phoA), 19 (hereinafter abbreviated as phoB), 20 (hereinafter abbreviated as phoC), 2
1 (hereinafter abbreviated as phoD) is provided and phoA1
8, the phoB 19 is installed in pairs on the sewing machine table in a position substantially parallel to the sewing machine needle 2, the phoC 20 is installed obliquely in front of this, and the phoD 21 is installed further behind it.

Next, an example of the control and detection means for operating the mechanism will be explained.
As shown in the figure, sensing members 22 and 23 are provided on the outer peripheral surface of the sewing machine pulley 1 in two layers, an inner peripheral side and an outer peripheral side, and a proximity switch 24 is used as a detection means.
(hereinafter referred to as KS1) and 25 (hereinafter referred to as KS
2). That is, KS1 and 24 are of the sensing member 22, and KS2 and 25 are of the sensing member 2.
The detection members 22 and 23 are designed to detect the protrusions from the starting end to the end thereof, and the circumferential length of the protrusions of the detection members 22 and 23 is made to match the operating position of the elliptical motion of the feed dog 3. be. Next, the operating mode of this configuration will be explained based on the flowchart shown in FIG.
The tip is detected by phoC20 → SM1, 15 rotates counterclockwise CCW when viewed from the motor output shaft side, arm 7 approaches from position A to position B as shown in the third figure, KS1, 24 and KS2 before starting the sewing machine,
Sewing machine pulley sensing members 22, 23 by 25
When the sewing machine starts and sewing starts while detecting the on/off state of If the presser foot or the edge of the fabric is not located between phoA 18 and phoB 19, this is detected by both, and the slide is corrected by transmitting the rotation of SM2 and 16 to the timing belt 11 according to the position, causing forward and reverse rotation. do. → When KS2 and 25 are turned on, the fabric edge control is stopped and SM1 and 24 are turned clockwise.
Timing belt 1 by rotating cw
1 and release the presser foot on the fabric surface.

In addition, although the number of pulses of SM1 is illustrated in the figure, this number of pulses defines the range of contact and separation of timing belt 11 from the sewing machine table surface due to the rotation of arm 7, and SM1 is rotated by the number of pulses of 883. In this way, it is brought close to a position with a clearance t of 0.25 mm above the fabric, and further, by sending five pulses, it is brought into complete pressure contact with the fabric surface. Therefore, the number of pulses to be emitted varies depending on the thickness of the target material, desired clearance, etc.

The above operation is such that when the feed dog is not feeding the fabric, the timing belt presses the fabric to prevent or correct misalignment of the edge of the fabric, while when the fabric is being fed. The sewing machine allows the fabric to move freely with a small clearance, and also regulates the upper surface of the fabric to prevent large disturbances of the fabric to be sewn. It goes without saying that it is desirable that the clearance be as small as possible, since such an operation is repeated within a very microscopic period of time.

The mutual operating states as described above are shown in the operating relationship diagram in Fig. 8, and the operating conditions of SM2 and 16 are shown in Fig. 9.
As shown in the figure. The above operation is repeated while the fabric to be sewn is present and while the desired range of sewing is being performed. For example, when the end of fabric a is
When detected by phoD21, SM2,1 is detected in the example shown.
The fabric edge control by 6 is stopped and only fabric pressing is performed (of course, it is okay to continue fabric edge control).On the other hand, when the end of fabric a or a predetermined sewing range is detected by phoC20, SM1, 15
The proximity switch 26 receives the pulse for returning to the origin.
(hereinafter abbreviated as KS3), the machine stops, returns to its original position, and prepares for the next sewing. Note that KS3 (26) in FIG. 3 is also used for returning to the origin when the power is turned on.

Next, another example of the configuration of the device of the present invention will be described. In FIG. 10, a pair of upper and lower timing belts 11 are provided, and the nip between the belts eliminates miscontrol due to slips, etc., and the power of the SMs 2 and 16 is transferred to the gear 27. This signal is transmitted to the gear 28 to drive the lower timing belt 29, which has the advantage of accurately controlling the edge of the fabric. Further, FIG. 13 shows an example of a mechanism in the case where there are two pieces of target fabric, in which edge guides of the mechanism as illustrated in FIG. The control for the fabric is the upper edge guide 6, and the control for the lower fabric is the lower edge guide 3.
1, respectively. However, such control is carried out by receiving the position signal of the feed dog detected from the above-mentioned pulley in common for both the upper and lower feed teeth. Incidentally, the figure shows a reflection type photosensor 32,
phoE, 33, phoF are phoA18phoB19 in the same figure.
In addition, the proximity switch 34 and KS4 are connected to KS3 (26), and the stepping motors 35 and 36 are connected to SM
1, 15, SM2, and 16, and a timing belt 37 that rotates under the driving of a stepping motor 36 corresponds to the timing belt 11, respectively.
They have almost the same purpose and structure, and perform the same operations.

In addition, in the case of controlling two pieces of fabric, or in the case of sewing specifications in which the thickness of the fabric changes during sewing, in order to detect the overlapping state of the fabric, the entrance of the edge guide 6 is set as shown in FIGS. 2 and 3. A transmission type photo sensor (phoG) consisting of a light emitter 38 and a light receiver 39 is installed in the section, and an example of detection by this is as shown in Fig. 16, in which the fabric thickness is converted into an output voltage. The gap t is controlled according to the fabric thickness. still,
FIG. 17 shows a control device that integrates each embodiment of the present invention.

In the above-described embodiments of the present invention, the rotation of the pulley is controlled by indirectly converting it into the rotation of the feed dog, but it is also possible to directly detect the rotational position of the feed dog for control. It is also possible to perform control by detecting the vertical movement of the sewing machine needle. or,
If the fabric thickness does not change, you can use an air cylinder instead of SM1 or 15.Also, if you measure the fabric edge shape, record the fabric edge information, and perform fabric edge control based on that information for a certain period of time. Other than that, SM
2 and 16 may be DC servo motors. Further, the detection of the material thickness and the detection of the protrusions of the pulleys by KS1, 24, KS2, and 25 can also be performed using other methods, such as a limit switch, a photo sensor, etc. Furthermore, in place of the structure of the timing belt 11 of the present invention, which advances and retreats over the fabric to control the edge of the fabric, Japanese Patent Application No. 57-93641 (refer to Japanese Patent Publication No. 60-43991) and Japanese Patent Application No. 57-1982 filed by the applicant of the present invention are proposed. −
It is also possible to use an edge guide having a structure such as No. 225366 (see Japanese Patent Publication No. 60-42744).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a sewing machine to which the present invention is applied, FIG. 2 is a plan view showing a first embodiment of the sewing machine of the present invention, FIG. 3 is a front view of FIG. 2, and FIG. 5 is a front view showing the detection mechanism in the pulley section, FIG. 6 is a side view of FIG. 5, FIG. 7 is a flowchart of the control of the device of the present invention, and FIG. 9 is a diagram of the operating relationship of each part in the present invention, FIG. 9 is a diagram of the operating conditions of the stepping motor 16 of the present invention, FIG. 10 is a front view showing the second embodiment of the device of the present invention, and FIG. Figure 12 is a sectional view taken along the line A-A, Figure 10 is a sectional view taken along the line B-B, and Figure 13 is a sectional view taken along the line B-B.
The figure is a front view showing the third embodiment of the device of the present invention;
Figure 4 is a sectional view taken along the line A-A in Figure 13, and Figure 15 is a cross-sectional view of Figure 1.
FIG. 3 is a sectional view taken along the line B-B, FIG. 16 is a diagram showing the relationship between fabric thickness and output voltage, and FIG. 17 is a control diagram of the apparatus according to the embodiment of the present invention. 1... Sewing machine pulley, 2... Sewing machine needle, 3...
... Sewing machine feed dog, 4 ... Sewing machine throat plate, 5 ... Sewing machine table, 6 ... Edge guide, 7 ... Arm, 8 ... Timing pulley, 11 ... Timing belt, 12, 13 ... Gear, 15 ... Stepping motor, 16... Stepping motor, 18, 19, 20, 21... Photo sensor,
22, 23... Sensing member, 24, 25... Proximity switch, 26... Proximity switch, 27, 28...
Gear, 29... Timing belt, 30... Fabric separator, 31... Edge guide, 32,3
3...Photo sensor, 34...Proximity switch, 3
5, 36... Stepping motor, 37... Timing belt, 38... Photo sensor floodlight,
39...Photo sensor receiver, 40...Guidance guide.

Claims (1)

[Scope of Claims] 1. During sewing in which needle movement is performed continuously, when the sewing machine feed dog, which operates in conjunction with the needle movement, shifts to fabric feeding operation, this is detected,
It automatically releases the pressure of the fabric press on the sewing machine table, and detects this and automatically presses and slides the fabric between the end of the fabric feeding operation and the start of the next feeding operation. An automatic control method for sewing material, characterized by moving the edge of the material to a predetermined position and correcting it. 2 A rotating sewing machine pulley or a sewing machine feed dog is provided with a detection element for detecting its rotation angle and operating position to form a sewing section, and is arranged at a predetermined distance from the sewing section and at the edge of the fabric. A fabric edge position detection member arranged in a manner that intersects with the edge of the fabric and has a plurality of detection elements arranged therein; A control mechanism is provided that transmits the detected rotation angle of the pulley or the operating position of the sewing machine feed dog to the fabric edge correction unit, which is activated and stopped by the detection element in the fabric edge correction unit and the sewing machine sewing unit. An automatic control device for sewing material, characterized by comprising: