JP2623693B2 - Lock sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a thread tension display device for a sewing machine, and more particularly, to a hieroglyph for indicating a thread tightening state of a stitch formed on a work cloth. The present invention relates to a thread tension display device of a sewing machine provided.

[Prior Art] Conventionally, as a thread tension display device that indicates the tension applied to a sewing thread, there are a thread tension display device in which the strength of the thread tension is represented by + and-, and a device in which the number increases as the thread tension increases.

[Problem to be Solved by the Invention] However, when the thread tension is changed by operating the operating member of the thread tension display device and changing the thread tension state of the seam, that is, when the operating member is operated, the thread tension is changed. Does not specifically indicate what effect the stitches have, so when it is not possible to obtain a normal stitch, it is not possible to determine what operation to perform to obtain a normal stitch. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to operate an operation member of a thread tension device from a thread-tightened state of a stitch when a normal stitch cannot be obtained. An object of the present invention is to provide a thread tension display device of a sewing machine that allows an operator to easily determine how to operate the machine.

[Means for Solving the Problems] In order to achieve this object, a lock sewing machine according to the present invention comprises:
A thread tension device having an operation portion movable to apply tension to a sewing thread for a sewing needle reciprocating up and down, and a thread tension device having an operation portion movable to apply tension to a sewing thread to a looper cooperating with the sewing needle And a symbol provided along the movement locus of the operation unit of each thread tension device to indicate a thread tightening state of the sewing thread to be tensioned by the thread tension device. The symbol of the thread and the symbol of the thread with respect to the looper are shown in different shapes, and among the symbol, the symbol of the thread with respect to the sewing needle and the symbol of the thread with respect to the looper are indicated with different colors.

[Action] In the lock sewing machine of the present invention having the above configuration,
When the operator performs the test stitching and a normal stitch is not obtained, the operation member is operated by comparing with the formed stitch. Among the hieroglyphs, the shape and color of the hieroglyph of the thread with respect to the sewing needle and the hieroglyph of the suture with respect to the looper are different from each other.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of the overcast sewing machine.
The machine frame 10 includes a bed 12, a pillar 14 and an arm 16.
It is composed of A needle bar 20 capable of reciprocating up and down is provided at a lower end of the head 18 of the arm portion 16, and two sewing needles 22 are provided at a lower end of the needle bar 20. Further, a presser bar 24 is provided at the lower end of the head 18 so as to be vertically movable behind the needle bar 20, and a presser foot 26 is attached to the lower end of the presser bar 24. A press-up lever 28 for raising and lowering the presser bar 24 is provided on a side surface of the pillar 14.
On the front of the head 18, a light-emitting diode is lit when the presser bar 24 is raised by operating the presser lifting lever 28.
30 and a light emitting diode 32 that lights up when a power switch (not shown) is turned on.

Four openings 33 are provided on the front surface of the arm portion 16, and operation knobs 56 of the thread tension device 34 project from the openings 33 so as to be manually operable. The thread tension device 34 is provided in the arm 16 and a thread supply path 35 provided on the front of the arm 16.
The upper thread and the looper thread passing through are each configured to apply tension.

Therefore, the structure of the thread tension device 34 will be described in detail. As shown in FIGS. 2 to 4, the mounting plate 36 is fixed to the sewing machine frame 10 by a pair of screws 38, and on the right side thereof, in the vertical direction. Extending guide support pieces 40 are formed, and a support shaft 42 extending in the left-right direction is fixed to the upper left side. A pair of thread tension members 44 are supported by the support shaft 42 so as to be movable in the axial direction, and a thread passing through the thread supply path 35 is clamped between the thread tension members 44. A leaf spring 46 for applying a thread tension pressure to the thread tension member 44 is attached to a mounting plate by a shaft 48 at a lower end.
An elongate hole 50 is formed at the upper end thereof and is rotatably attached to the upper end 36. The elongate hole 50 extends vertically.

The adjusting member 52 is vertically supported by the guide supporting piece 40 of the mounting plate 36, an engaging portion 54 is provided at the rear thereof for pressing and engaging with the leaf spring 46, and an operation knob 56 projects from the front. Has been established. Then, by moving the adjusting member 52 to change the pressing engagement position of the engaging portion 54 with respect to the leaf spring 36, the degree of curvature of the leaf spring 46 changes, and the thread of the leaf spring 46 with respect to the thread tension member 44 is changed. The tone pressure can be adjusted.

The fine adjustment member 58 is interposed between the leaf spring 46 and the thread tension member 44, and includes a bolt body 60 and a nut body 62. The bolt body 60 is movably fitted to the support shaft 42, and a pin 64 that fits into the long hole 50 of the leaf spring 46 and a leaf spring 46
A pair of rotation restricting portions 66 engaged with both upper ends of the
An arc-shaped projection 68 is provided on the inner side surface of the 46 so as to press and engage. The nut body 62 is screwed to the bolt body 60 so as to be rotatable. A plurality of non-slip grooves 70 are formed on the outer periphery of the nut body 62, and a plurality of nuts 62 are engaged with the thread tension member 44 at the left end. )
Spherical projection 72 is provided. Then, by rotating the nut body 62 to change the length of the fine adjustment member 58 itself, the distance between the leaf spring 46 and the position adjustment member 44 changes, thereby finely adjusting the thread tension pressure. can do.

Next, a description will be given of a thread tension display device that indicates the thread tension adjusted by the thread tension device 34.

On the front surface of the arm portion 16, a symbol 74 of an overlock stitch formed above the opening 33 is displayed.
The hieroglyph 74 will be described in more detail with reference to FIG. FIG. 5 is an enlarged view of the vicinity of the thread tension indicating device showing the thread tension of the overlooper thread, and the pattern 74 of the overlock stitch has four needle threads, the overlooper thread and the underlooper thread.
It is composed of a book thread symbol, and the overlooper thread symbol 76 is displayed in a different color from the other thread symbols to distinguish it from other threads. Note that the thread tension display device for indicating the thread tension of the other threads is also the same.
The symbol of the thread affected by is displayed in a different color from the symbol of the other thread.

Further, between the opening 33 and the thread supply path 35, a symbol 78 indicating the thread tightening state of each thread is displayed on the front surface of the arm 16 so as to follow the movement locus of the operation knob 56.
The hieroglyph 78 will be described with reference to FIG. 5 with respect to a thread tension display device for an overlooper yarn. A hieroglyph 82 indicating the state in which the overlooper thread is the most loose is displayed, and scales 84 are evenly displayed between them.

FIG. 6 is an enlarged view of the vicinity of the thread tension display device showing the thread tension of the needle thread, and a symbol 86 indicating a thread tightening state different from that of the overlooper thread is displayed.

The operation of the overlock sewing machine configured as described above will be described below.

First, the operator sewes the operation knob 56 while aligning it with the center of the scale 84 as shown in FIG. Then, the obtained thread tightening state of the seam is compared with the hieroglyph 74, and if a good seam is not obtained, for example, the thread tightening state of the overlooper thread is too strong, and the If the thread is formed as shown in FIG. 80, the operation knob 56 of the thread tension device 34 that affects the overlooper thread is operated downward to weaken the thread tension of the overlooper thread, and the thread tightening state is too weak. If the tightened state is formed like hieroglyph 82, use the operation knob
Operate 56 upward to increase the thread tension of the overlooper thread.

The present invention is not limited to the embodiments described in detail above,
Various changes can be made. For example, in this embodiment, an overlock sewing machine is described, but the present invention can be used for other sewing machines such as a lockstitch sewing machine and a double chain stitch sewing machine. In this embodiment, a slide type thread tension device is employed, but the present invention can be applied to a rotary type thread tension device.

[Effects of the Invention] As is clear from the above description, according to the present invention, the correct stitch is displayed by displaying the thread tightening state corresponding to the operation position of the operation member of the thread tension device. There is an effect that the operator can easily determine the operation to obtain.

[Brief description of the drawings]

FIG. 1 is a front view of an overlock sewing machine employing one embodiment of the present invention, FIG. 2 is a front view of a thread tension device provided in the sewing machine, and FIG. 3 is a side view of the thread tension device. FIG. 4 is a sectional view showing a part of the thread tension device, and FIGS.
The figure is a front view showing the vicinity of a thread tension display device provided on the front surface of an arm portion of the sewing machine. In the drawing, 10 is a sewing machine frame, 34 is a thread tensioner, 56 is an operation knob, and 78 is a phantom.

Claims (1)

(57) [Claims] 1. A thread tension device having an operating portion movable to apply a tension to a sewing thread for a sewing needle (22) reciprocating up and down, and a thread tensioner for moving a sewing thread to a looper cooperating with the sewing needle. A thread tension device having a possible operation unit; and a symbol provided along a movement locus of the operation unit of each thread tension device to indicate a thread tightening state of a sewing thread to which tension is applied by the thread tension device. (78), wherein, among the hieroglyphs (78), the hieroglyphs (86) of the thread with respect to the sewing needle (22) and the hierarchies (80, 8) of the thread with respect to the looper
2) is shown in a different shape, and the symbol (7
8) Of the sewing needles (22), the hieroglyphs of the sewing thread (86)
A lock sewing machine characterized in that the sewing machine and the looper (80, 82) have different colors.