Electronic sewing machine with SS function

Abstract

The invention discloses an electronic sewing machine with an SS function, which comprises a sewing machine rack, the sewing machine rack is provided with an adjusting box used for controlling stitch length, the adjusting box is arranged at the lower part of the sewing machine rack, the adjusting box is connected with an SS lever used for pushing the adjusting box to rotate, the SS lever is connected with an SS pawl, and the SS pawl is connected with an SS pawl. And an SS cam capable of pushing the SS pawl to move is arranged above the SS pawl. The electronic sewing machine has the advantages that the SS cam structure is adopted, two-needle advancing and one-needle retreating are formed through the SS cam, SS sewing stitches are generated, formation of the SS sewing stitches is achieved, a stitch length motor and a driving chip of the stitch length motor are omitted, cost is reduced, the production cost of the whole electronic sewing machine is reduced, the market share of products is increased, and economic benefits are improved; the use effect is good and popularization is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to an electronic sewing machine with SS function. Background Art

[0002] At present, common sewing machines on the market usually use a needle distance motor in their structure, and then generate SS stitches by controlling the needle distance motor. The disadvantage of this structure is that it is necessary to add a needle distance motor and a corresponding driver chip, which increases the cost of the needle distance motor and the corresponding driver chip, resulting in increased costs and an increase in the production cost of the entire electronic sewing machine. The actual application effect is not ideal. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned shortcomings of the prior art and provide an electronic sewing machine with SS function, which eliminates the use of a stitch length motor and a corresponding driver chip, thereby reducing production costs.

[0004] The present invention solves its technical problems by adopting a technical solution: this electronic sewing machine with SS function includes a sewing machine frame, a tuning box for controlling the stitch length is provided on the sewing machine frame, the tuning box is located at the lower part of the sewing machine frame, the tuning box is connected to an SS lever for pushing the tuning box to rotate, the SS lever is provided on the side of the sewing machine frame, the SS lever is connected to an SS pawl, an SS cam for pushing the SS pawl to move is provided above the SS pawl, and the SS cam and the SS pawl are both provided on the side of the sewing machine frame.

[0005] A stitch cam is provided below the SS pawl, and the stitch cam is provided on the sewing machine frame. A boss for engaging and disengaging the SS pawl and the stitch cam is provided at the rear of the stitch cam.

[0006] The SS cam is provided with a worm wheel, the worm wheel is meshed with an upper shaft worm, and the upper shaft worm is provided on a sewing machine frame.

[0007] An SS sensor is provided on one side of the SS cam, and the SS sensor is provided on the sewing machine frame.

[0008] An upper shaft is connected to the upper shaft worm, the upper shaft is arranged on the sewing machine frame, and a worm fixing screw is arranged on the upper shaft worm.

[0009] The front part of the stitch length cam is provided with a guide mold.

[0010] The beneficial effects of the present invention are as follows: the electronic sewing machine with SS function adopts an SS cam structure, and two needles formed by the SS cam advance and one needle retreat to generate SS stitches, thereby realizing the formation of SS stitches, eliminating the use of a stitch length motor and its driving chip, reducing costs, reducing the production cost of the entire electronic sewing machine, increasing the market share of the product, improving economic benefits, having good use effects, and being conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0012] Figure 2 This is a schematic structural diagram of the SS cam according to an embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the structure of the SS function implementation according to an embodiment of the present invention;

[0014] Figure 4 Schematic diagram of the prototype structure of the needle distance cam according to an embodiment of the present invention;

[0015] Figure 5 Schematic diagram of the boss structure of the needle distance cam according to an embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of the gear positions of the prototype according to an embodiment of the present invention;

[0017] Figure 7 This is a schematic diagram of the structure of the cooperation between the SS cam and the SS pawl according to an embodiment of the present invention;

[0018] Figure 8 This is a structural diagram of the disengagement of the SS cam and the SS pawl according to an embodiment of the present invention;

[0019] Figure 9 This is a structural diagram of the prototype in the first gear position according to an embodiment of the present invention;

[0020] Figure 10 This is a schematic structural diagram of the prototype in the second gear position according to an embodiment of the present invention;

[0021] Figure 11 This is a structural diagram of the prototype in the third gear according to an embodiment of the present invention;

[0022] Figure 12 This is a structural diagram of the prototype in the fourth gear according to an embodiment of the present invention;

[0023] Figure 13 Schematic diagram of the structure of the SS sensor according to an embodiment of the present invention.

[0024] Explanation of the accompanying reference numerals: sewing machine frame 1, adjustment box 2, SS lever 3, SS pawl 4, SS cam 5, stitch length cam 6, boss 7, worm gear 8, upper shaft worm 9, SS sensor 10, upper shaft 11, worm fixing screw 12, template 13, zigzag sewing motor 14. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Referring to the accompanying drawings: This electronic sewing machine with SS function includes a sewing machine frame 1. On the sewing machine frame 1, except for the structure described in the embodiment of the present invention, the remaining structures are the same as those of conventional electronic sewing machines and will not be repeated here. The sewing machine frame 1 is provided with a tuning box 2 for controlling the stitch length. The tuning box 2 is used to control the cloth feed stitch length. The cloth feed length changes accordingly with different rotation angles of the tuning box 2. The tuning box 2 is located at the lower part of the sewing machine frame 1. The tuning box 2 is connected to an SS lever 3 for pushing the tuning box 2 to rotate. SS refers to SS stitches. The SS lever 3 is used to push the tuning box 2 to rotate. The SS lever 3 is provided on the side of the sewing machine frame 1. The SS lever 3 is connected to an SS pawl 4. The SS pawl 4 is fixed together with the SS lever 3. An SS cam 5 that can push the SS pawl 4 to move is provided above the SS pawl 4. The SS cam 5 is used to push the SS pawl 4. Both the SS cam 5 and the SS pawl 4 are provided on the side of the sewing machine frame 1.

[0027] A stitch length cam 6 is provided below the SS pawl 4 , and the stitch length cam 6 is provided on the sewing machine frame 1 . A boss 7 for engaging or disengaging the SS pawl 4 and the stitch length cam 6 is provided at the rear of the stitch length cam 6 .

[0028] The stitch length cam 6 is used to adjust the stitch length and switch the SS gear.

[0029] Normal stitch length and buttonhole sewing function implementation principle description:

[0030] like Figure 2 As shown in , when sewing conventional and BH patterns, the boss 7 on the back of the stitch cam 6 pushes the SS pawl 4 away from the SS cam 5. At this time, the SS cam 5 is inoperative, and the stitch length is determined by the support 13 in front of the stitch cam 6. By rotating the stitch cam 6 to different positions, the support 13 on the stitch cam 6 pushes the SS lever 3 to a specific position, which in turn pushes the adjustment box 2 to rotate to a specific angle, thereby achieving the set stitch length.

[0031] When sewing buttonholes, a band switch is placed on the stitch cam 6 so that the control unit can sense the gear setting of the stitch cam 6 and output to the swing needle motor to form the corresponding BH stitch.

[0032] SS function implementation principle description:

[0033] like Figure 3 As shown in the figure, when the needle distance cam 6 is switched to the SS gear, the boss 7 at the rear of the needle distance cam 6 makes the SS pawl 4 cooperate with the SS cam 5. At this time, when the SS cam 5 rotates, it pushes the SS pawl 4 to swing, and through the SS lever 3 fixed on the SS pawl 4, it pushes the tuning box 2 to rotate, thereby achieving the SS sewing effect of two needles moving forward and one needle moving backward.

[0034] An SS sensor 10 is provided at the SS cam 5, and a control unit is connected to the SS sensor 10. In this embodiment, the control unit can be a CPU, which can execute work according to a set program. The SS sensor 10 sends the position of the SS cam 5 to the control unit. The control unit senses the rotation angle of the SS cam 5 and cooperates with the output to the oscillating needle motor to form a corresponding Z-shaped trajectory.

[0035] The SS cam 6 is provided with a worm wheel 8, and the worm wheel 8 is meshed with an upper shaft worm 9, which is provided on the sewing machine frame 1. The upper shaft worm 9 is used to generate a specific reduction ratio.

[0036] A SS sensor 10 is provided on one side of the SS cam 6 , and the SS sensor 10 is provided on the sewing machine frame 1 .

[0037] An upper shaft 11 is connected to the upper shaft worm 9 , and the upper shaft 11 is arranged on the sewing machine frame 1 . A worm fixing screw 12 is arranged on the upper shaft worm 9 .

[0038] A profiling die 13 is provided at the front of the stitch length cam 6 .

[0039] The boss 7 of the needle distance cam 6 is used to push the SS pawl 4 to clutch the SS cam 5, as shown in FIG. Figure 7 As shown, when the needle distance cam 6 rotates to the SS gear position, the SS cam 5 and the SS pawl 4 cooperate with each other.

[0040] The cooperation between the SS cam 5 and the SS pawl 4 is to feed the cloth forward (two consecutive stitches) at the trough and to feed the cloth backward (one stitch) at the peak.

[0041] like Figure 8 As shown: When the needle pitch cam 6 rotates to other gears, the SS cam 5 and the SS pawl 4 are disengaged.

[0042] The zigzag sewing motor 14 is used to control the position of the needle swing.

[0043] The needle distance cam 6 explains the function of the profiling curve: the outer ring of the profiling 13 forms a profiling curve, such as Figure 4 shown.

[0044] When the stitch length knob is not in the SS position (in the 0-4 stitch length position or the BH position), the SS cam does not work and the stitch length is determined only by the position of the profiling curve in front of the stitch length cam. The closer the profiling curve is to the center of the stitch length cam, the greater the feed amount; the closer it is to the edge, the smaller the feed amount, resulting in reverse feed.

[0045] The following takes BH (buttonhole sewing) as an example:

[0046] like Figure 9 As shown: Set the knob to the BH-Step 1 gear. At this time, the support mold 7 of the stitch cam 6 pushes the SS lever 3 to rotate and transmits it to the adjustment box 2, so that the adjustment box 2 rotates to the forward feeding position of 0.5mm. At the same time, the gear switch transmits the gear signal to the control unit to control the swing needle motor to sew the right part of BH.

[0047] like Figure 10 As shown: Set the knob to the BH-Step2 / 4 gear. At this time, the support mold 7 of the stitch cam 6 pushes the SS lever 3 to rotate and transmits it to the tuning box 2, causing the tuning box to rotate to the zero feed position. At the same time, the gear switch transmits the gear signal to the control unit to control the swing needle motor to sew the sealing part of the BH head.

[0048] like Figure 11 As shown: Set the knob to the BH-Step3 gear. At this time, the support mold 7 of the stitch cam 6 pushes the SS lever 3 to rotate and transmits it to the tuning box, causing the tuning box to rotate to the 0.5mm backward feeding position. At the same time, the gear switch transmits the gear signal to the control unit to control the swing needle motor to sew the left part of BH.

[0049] like Figure 12 As shown: Set the knob to BH-Step2 / 4 gear again. At this time, the needle distance cam 6's support 7 pushes the SS lever 3 to rotate, and transmits it to the tuning box 2, so that the tuning box rotates to the zero feed position. At the same time, the gear switch transmits the gear signal to the control unit, which controls the swing needle motor to sew the sealing part of the BH head, thus completing the sewing of the buttonhole.

[0050] Adjustment method of switching phase of cloth feed direction during SS sewing:

[0051] During SS sewing, the synchronization phase requirement between the SS cam 5 and the needle and feed dog is: when the SS pawl 4 is on the slope of the SS cam 5, the feed direction is switched. Therefore, when the SS pawl 4 moves on the slope, the needle and feed dog are both below the needle plate.

[0052] Adjustment method: Loosen the worm fixing screw 12, adjust the angle between the upper shaft worm 9 and the upper shaft 11, so that the SS cam 5 is in the matching position so that the needle is below the needle plate when the SS pawl 4 moves on the inclined surface of the SS cam 5.

[0053] Description of the implementation method of SS sewing feeding direction detection:

[0054] During SS sewing, the cloth is fed forward 2 stitches and then back 1 stitch, which is combined with the CPU-controlled needle movement to form expansion stitches.

[0055] Since the cloth feeding forward and backward is realized by purely mechanical mechanisms such as a worm, an SS cam and a ratchet, it is necessary to set up an SS sensor 10 to tell the CPU whether the current stitch step is a forward stitch step or a backward stitch step.

[0056] like Figure 13 As shown; a photoelectric switch is installed at the end of SS cam 5. When the stitch is moving backward, the photoelectric switch is blocked by SS cam 5, so that the position of the backward stitch can be detected; when the machine is rotating, the CPU will count the stitches to ensure the correctness of the output pattern.

[0057] The characteristics of the embodiment of the present invention are as follows: the electronic sewing machine with SS function of the present invention adopts an SS cam structure, and two needles advance and one needle retreat formed by the SS cam to produce SS stitches, thereby realizing the formation of SS stitches, eliminating the use of a stitch length motor and its driver chip, reducing costs, reducing the production cost of the entire electronic sewing machine, increasing the market share of the product, improving economic benefits, having good use effects, and being conducive to promotion.

[0058] Although the invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An electronic sewing machine with SS function, characterized by: The invention comprises a sewing machine frame (1), wherein a tuning box (2) for controlling the stitch length is provided on the sewing machine frame (1), the tuning box (2) is located at the lower part of the sewing machine frame (1), the tuning box (2) is connected to an SS lever (3) for pushing the tuning box (2) to rotate, the SS lever (3) is arranged on the side of the sewing machine frame (1), the SS lever (3) is connected to an SS pawl (4), an SS cam (5) for pushing the SS pawl (4) to move is provided above the SS pawl (4), and the SS cam (5) and the SS pawl (4) are both arranged on the side of the sewing machine frame (1).

2. The electronic sewing machine with SS function according to claim 1, characterized in that: A stitch cam (6) is provided below the SS ratchet (4), and the stitch cam (6) is provided on the sewing machine frame (1). A boss (7) for engaging and disengaging the SS ratchet (4) and the stitch cam (6) is provided at the rear of the stitch cam (6).

3. The electronic sewing machine with SS function according to claim 1, characterized in that: The SS cam (6) is provided with a worm wheel (8), an upper shaft worm (9) is meshed with the worm wheel (8), and the upper shaft worm (9) is provided on a sewing machine frame (1).

4. The electronic sewing machine with SS function according to claim 1, characterized in that: An SS sensor (10) is provided on one side of the SS cam (6), and the SS sensor (10) is provided on the sewing machine frame (1).

5. The electronic sewing machine with SS function according to claim 3, characterized in that: The upper shaft worm (9) is connected to an upper shaft (11), the upper shaft (11) is arranged on a sewing machine frame (1), and a worm fixing screw (12) is arranged on the upper shaft worm (9).

6. The electronic sewing machine with SS function according to claim 2, characterized in that: The front portion of the needle distance cam (6) is provided with a backing mold (13).

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