JPH0540873Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a thread tension control mechanism for sewing machines, and in particular, it is a method for easily and appropriately adjusting the thread tension depending on the sewing material and the type of thread. Regarding technology for controlling

[Prior Art] In automatic sewing machines, if there is a relative discrepancy between the amount of fabric fed by the feed dog (stitch pitch) and the amount of movement of the fabric itself (travel speed), sewing will occur in an incorrect state called puckering. will be done.

On the other hand, even if automatic sewing is performed without any relative deviation between the amount of feed by the feed dog and the amount of movement of the fabric itself, if the thread tension is not adjusted properly, the above-mentioned puckering or improper sewing will occur.

Therefore, in an automatic sewing device, it is required to eliminate the relative deviation between the feed amount and the movement amount, and to appropriately control the thread tension.

However, the conventional thread tension control mechanism is configured to adjust the thread tension by rotating the thread tension screw based on the "feel" of the operator.

Furthermore, it is said that the thread tension must be adjusted each time the sewing material and the type of thread change.

[Problem to be solved by the invention] As described above, although the thread tension must be adjusted according to the sewing fabric and the type of thread, the conventional control mechanism does not allow for variations in the degree of adjustment of the thread tension. is likely to occur, and requires a relatively long control time. Therefore, this is a cause of deterioration in quality and workability.

The present invention was developed in consideration of these circumstances, and even when adjusting the thread tension depending on the type of sewing fabric and thread, it is easy for the operator to adjust the thread tension each time. A sewing machine thread tension control mechanism that quickly and appropriately controls based on numerical values corresponding to data without relying on "feel" to avoid puckering and improper sewing, and improves quality and work efficiency. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cylinder that presses one side of yarn presser plates facing each other toward the other side, and a high-pressure fluid that supplies high-pressure fluid to this cylinder. A supply source, a pressure adjustment member that is interposed in a passage connecting the cylinder to the high-pressure fluid supply source and adjusts the supply pressure to the cylinder, and a display mechanism that converts and displays the supplied fluid pressure set by the pressure adjustment member numerically. It is equipped with the following.

[Operation] According to the present invention, the thread tension can be adjusted by adjusting the pressure of the fluid supplied to the cylinder by operating the pressure adjusting member.

Furthermore, the degree of thread tension set by the adjusted supply fluid pressure, that is, the amount of tension applied to the thread, must be set by visually checking the numerical value displayed on the display mechanism. I can do it.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Fig. 1 is a front view showing an embodiment of the thread tension control mechanism according to the present invention, and Fig. 2 is a side view of the same. Applying frictional force to the upper thread 2A and lower plate 2B to impart tension to each thread 2A, 2B 1
Pair of cylinders 3A, 3B and these cylinders 3
A high-pressure fluid supply source 5 that supplies high-pressure fluid (for example, compressed air) to A and 3B via a passage 4, and pressure adjustment members 6A and 6B that are interposed in the passage 4 and adjust the supply pressure to the cylinders 3A and 3B. and a display mechanism 7 that numerically converts and displays the supply fluid pressure set by the pressure adjustment members 6A, 6B.

The control mechanism 1 is attached to the sewing machine main body 8 via a bracket 9, and includes a pair of upper and lower horizontal bars 9A and 9B that extend horizontally toward the operation side of the sewing machine.
It is composed of a pair of vertical plates 9C and 9D that connect the base end and the distal end of these horizontal bars 9A and 9B,
The cylinders 3A and 3B are the vertical plates 9 of the bracket 9.
D, it is attached to the sewing machine main body 8 with a horizontal axis.

Piston rod 3a of each cylinder 3A, 3B,
3b has a vertical plate 9C concentrically with the cylinders 3A and 3B.
The tips of pins 10A and 10B that are attached to the cylinders 3A and 10B and extend horizontally toward the cylinders 3A and 3B are slidably fitted, respectively.
Thread presser plates 11A, 1 facing each other are provided at the base of B.
1B is inserted and held, and a coil spring 12 interposed between the thread holding plate 11B and the piston rods 3a, 3b connects the thread holding plate 11B to the thread holding plate 11A.
It is energizing towards.

Therefore, a tension proportional to the pressure level of the fluid supplied to the cylinders 3A, 3B is applied to each yarn 2A, 2B.

The display mechanism 7 is for numerically converting and displaying the supply fluid pressure set by the pressure adjustment members 6A and 6B, and is installed, for example, on a workbench (not shown) on which the sewing machine main body 8 is mounted. Display box 7
At A, a display window 7B1 for numerically converting and displaying the fluid pressure supplied to the cylinder 3A and a display window 7B2 for numerically converting and displaying the fluid pressure supplied to the cylinder 3B are formed. .

In the above configuration, by adjusting the pressure of the fluid supplied from the high-pressure fluid supply source 5 to the cylinders 3A, 3B by adjusting the pressure adjusting members 6A, 6B, the pressure of the coil spring 12 by the piston rods 3a, 3b can be adjusted. The pressure intensity is adjusted.
In other words, the force with which the thread presser plate 11B is pressed against the thread presser plate 11A is adjusted, thereby controlling the tension of both the upper thread 2A and the lower thread 2B.

Moreover, the degree of thread tension is controlled (both upper and lower threads 2
The size of the tension given to A and 2B)
can be confirmed by visually checking the numerical values displayed on the display windows 7B1 and 7B2 of the display box 7A in the display mechanism 7.
Even if the thread tension is adjusted each time depending on the type of thread,
Instead of relying on the “feel” of the worker as in the past,
By adjusting the pressure adjusting members 6A, 6B so that numerical values corresponding to the data are displayed on the display windows 7B1, 7B2, an appropriate thread tension can be easily and reliably set. Therefore, occurrence of puckering and improper sewing can be avoided, and quality and work efficiency can be improved.

[Effects of the invention] Since the present invention is configured as described above,
This produces the following effects.

That is, the thread tension can be adjusted by adjusting the pressure of the fluid supplied to the cylinder by operating the pressure adjusting member. Moreover, the degree of controlled thread tension, that is, the amount of tension applied to the thread, can be confirmed by visually checking the numerical value displayed on the display mechanism, so it is possible to check the degree of controlled thread tension, in other words, by visually checking the numerical value displayed on the display mechanism. Therefore, even if the thread tension is adjusted each time according to these types, the display mechanism will now display the numerical value corresponding to the data, without relying on the operator's "feel" as in the past. By adjusting the pressure adjusting member, it is possible to easily and reliably set the appropriate thread tension. Therefore,
The occurrence of puckering and improper sewing is avoided, and quality and work efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the thread tension control mechanism according to the present invention, and FIG. 2 is a side view of the same. 1... Thread tension control mechanism, 2A, 2B... Thread, 3
A, 3B... Cylinder, 4... Passage, 5... High pressure fluid supply source, 6A, 6B... Pressure adjustment member, 7...
...Display mechanism, 11A, 11B... Thread presser plate.

Claims (1)

[Scope of utility model registration request] A cylinder that presses one side of the mutually opposing yarn presser plates toward the other side, a high-pressure fluid supply source that supplies high-pressure fluid to this cylinder, and a passage that connects the cylinder and the high-pressure fluid supply source to the cylinder. A thread tension control mechanism for a sewing machine, comprising: a pressure adjustment member that adjusts supply pressure; and a display mechanism that numerically converts and displays the supply fluid pressure set by the pressure adjustment member.