Presser foot lifter and thread tensioner drive for a sewing machine

Abstract

The utility model discloses a sewing machine's lift presser foot and loose line drive arrangement, including the oil box of fixed bottom plate lower surface, the oil box outside rotation has the knee control shaft, is equipped with the two -way crank on the knee control shaft, is equipped with the pull rope in the oil box, and the pull rope one end is linked with two -way crank, and the pull rope other end is linked with the presser foot subassembly. The pull rope is arranged in the oil box, and the pull rope is protected in the pull rope protection rubber sleeve, and the pull rope protection rubber sleeve is protected in the oil rubber sleeve, realizes the pull rope and the quick separation of oil box, avoids the seepage of machine oil, prevents the pollution material in the process of sewing, and is convenient for the later maintenance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field, concretely is a sewing machine's lift presser foot and loose line drive arrangement. BACKGROUND

[0002] The patent no. 201410116442.2 discloses a knee control lift presser foot device of sewing machine, including the oil box of fixed in the bottom plane of bottom plate, the box body of oil box is provided with the lift presser foot device connected with presser foot mechanism and driving its lift presser foot action, lift presser foot device is connected with knee control mechanism, and knee control mechanism drives lift presser foot device action to realize lift presser foot action, and knee control mechanism is detachably connected with lift presser foot device.

[0003] The patent disclosure has certain defects, the top rod will move up and down in the process of lifting the presser foot, and the oil cap between the top rod and the oil pan will also stretch and contract with the top rod. The oil cap will be damaged due to frequent stretching and contraction, which will cause the sealing between the top rod and the oil cap to be poor, and thus the oil pan will leak oil. SUMMARY

[0004] The utility model discloses in light of above-mentioned technical problem, and provide a sewing machine's lift presser foot and loose line drive arrangement, realize lift presser foot and loose line function through the length of pull rope adjustment, and pull rope is isolated with the inner chamber of oil box, and the sealing effect is better, has better practical value.

[0005] The utility model discloses the technical scheme that the above-mentioned technical problem is adopted: a sewing machine's lift presser foot and loose line drive arrangement, including the oil box of fixed in the lower surface of bottom plate, oil box outer rotation installs the knee control shaft, is equipped with the double -action crank on the knee control shaft, is equipped with pull rope in the oil box, and pull rope one end is linked with double -action crank, and pull rope other end is linked with presser foot subassembly.

[0006] To optimize the above technical scheme, the utility model still includes the following improved technical scheme.

[0007] The above-mentioned oil box inner wall has installation face, and the installation face is provided with mounting hole, and the mounting hole is provided with fixed joint, and the pull rope passes through mounting hole, fixed joint in proper order;Pull rope is provided with pull rope protection rubber sleeve, and one end of pull rope protection rubber sleeve is provided with pull rope connecting piece, and fixed joint is locked and fixed with pull rope connecting piece through fixed sleeve;One end of fixed sleeve is provided with locking nut, and locking nut is locked with the outer wall of pull rope connecting piece.

[0008] The above-mentioned fixed joint is provided with oil pad between installation face;Pull rope protection rubber sleeve is provided with an oil rubber sleeve, and one end of oil rubber sleeve abuts against installation face, and the other end of oil rubber sleeve is locked pull rope protection rubber sleeve through pipe clamp.

[0009] The bidirectional crank is provided with a pull rope fixing part, the pull rope fixing part is provided with a pull rope through hole for the pull rope to pass through, a pull rope lock sleeve is arranged below the pull rope fixing part, one end of the pull rope passes through the pull rope through hole and the pull rope lock sleeve in sequence, and the rope head of the pull rope is folded into the pull rope lock sleeve and is fixed and locked by an inner locking screw.

[0010] The first mounting part of the fixed joint is mounted into the mounting hole, the second mounting part of the fixed joint is abutted against the mounting surface through the oil pad, and the third mounting part of the fixed joint is locked and fixed with the pull rope connecting piece through the fixing sleeve.

[0011] The other end of the pull rope is connected with the first crank, the first crank is connected with the lifting front lever, and the lifting front lever is connected with the presser foot assembly.

[0012] The thread tensioner is arranged on the sewing machine shell, the thread loosening rod is arranged in the thread tensioner, the rear end of the thread loosening rod is provided with an inclined surface, the lifting front lever is provided with a forward extending abutting part, and the abutting part is in abutment with the inclined surface.

[0013] Compared with the prior art, the lifting presser foot and thread loosening driving device of the sewing machine, the pull rope is arranged in the oil box, the pull rope is protected in the pull rope protection rubber sleeve, the pull rope protection rubber sleeve is protected in the oil rubber sleeve, the pull rope and the oil box are quickly separated, machine oil seepage is avoided, pollutants are prevented from polluting materials during sewing, and post-maintenance is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the embodiment.

[0015] Figure 2 It is a partial cross-sectional schematic diagram of the embodiment.

[0016] Figure 3 It is Figure 2 an exploded view. DETAILED DESCRIPTION

[0017] The embodiments of the utility model are further described in detail below with reference to the drawings.

[0018] Figures 1 to 3 The structure schematic diagram of the utility model is shown.

[0019] The drawing reference is: oil box 1, mounting surface 1a, mounting hole 1b, knee control shaft 2, bidirectional crank 3, pull rope fixing part 3a, pull rope through hole 3b, pull rope 4, first screw 5, limiting screw 6, pull rope lock sleeve 7, inner locking screw 8, fixed joint 9, first mounting part 9a, second mounting part 9b, third mounting part 9c, oil pad 10, pull rope protection rubber sleeve 11, pull rope connecting piece 11a, fixed sleeve 12, locking nut 13, oil rubber sleeve 14, pipe clamp 15, first crank 16, first connecting end 16a, second connecting end 16b, third connecting end 16c, lifting front lever 17, abutting part 17a, presser foot assembly 18, thread clamping device 19, thread loosening lever 20, inclined surface 20a.

[0020] As shown in Figure 1 The utility model discloses a sewing machine's lift presser foot and thread loosening drive arrangement, including the oil box 1 of fixed bottom plate lower surface, oil box 1 is equipped with the knee control shaft 2, and one end of knee control shaft 2 is connected knee control assembly. The bidirectional crank 3 is equipped on knee control shaft 2, and the pull rope 4 is arranged in oil box 1, one end of pull rope 4 is connected with bidirectional crank 3, and the other end of pull rope 4 is connected with presser foot assembly 18 through lifting front lever 17, and lifting front lever 17 is provided with the abutting part 17a that cooperates with thread clamping device 19, realizes lift presser foot and thread loosening function.

[0021] As shown in Figure 2 And Figure 3 Oil box 1 is rotatably installed with knee control shaft 2, and bidirectional crank 3 is fixed on knee control shaft 2 through first screw 5. One end of bidirectional crank 3 is provided with limiting screw 6, when knee control shaft 2 drives bidirectional crank 3 to rotate, the bottom of limiting screw 6 can abut against the outer wall of oil box 1, and the rotation angle of bidirectional crank 3 is limited. The other end of bidirectional crank 3 is provided with pull rope fixing part 3a, and one end of pull rope 4 is fixed below pull rope fixing part 3a, and bidirectional crank 3 can drive one end of pull rope 4 to be tight or to be released.

[0022] Pull rope fixing part 3a is provided with pull rope through hole 3b for pull rope 4 to pass through, and pull rope lock sleeve 7 is arranged below pull rope fixing part 3a, one end of pull rope 4 passes through pull rope through hole 3b and pull rope lock sleeve 7 in sequence, then the rope head of pull rope 4 is folded into pull rope lock sleeve 7 and is fixed and locked through inner locking screw 8, and the length of pull rope 4 can be adjusted appropriately, which increases the applicability of the device.

[0023] Inclined mounting surface 1a is formed in oil box 1, mounting hole 1b is formed in mounting surface 1a, fixed joint 9 is mounted in mounting hole 1b, and first mounting part 9a of fixed joint 9 is mounted in mounting hole 1b. Oil pad 10 is arranged between fixed joint 9 and mounting surface 1a, second mounting part 9b of fixed joint 9 is abutted on mounting surface 1a through oil pad 10, and pull rope 4 passes through mounting hole 1b and fixed joint 9 in sequence.

[0024] The pull rope 4 is sleeved with a pull rope protection sleeve 11, the pull rope protection sleeve 11 protects the pull rope 4, and machine oil is prevented from leaking out. One end of the pull rope protection sleeve 11 is provided with a pull rope connecting piece 11a, and the third mounting portion 9c of the fixed joint 9 is locked and fixed with the pull rope connecting piece 11a through a fixed sleeve 12. One end of the fixed sleeve 12 is provided with a locking nut 13, the locking nut 13 is locked with the outer wall of the pull rope connecting piece 11a, and the fixed sleeve 12 is locked between the fixed joint 9 and the locking nut 13.

[0025] The pull rope protection sleeve 11 is externally provided with an oil sleeve 14, one end of the oil sleeve 14 abuts against the mounting face 1a of the oil box 1, and the other end of the oil sleeve 14 locks the pull rope protection sleeve 11 through a pipe clamp 15. The oil sleeve 14 protects the pull rope protection sleeve 11, effectively isolates the pull rope 4 from the oil box 1, and machine oil is prevented from leaking out again.

[0026] The other end of the pull rope 4 is connected with a first crank 16, the first crank 16 is connected with a lifting front lever 17. The first crank 16 is provided with a first connecting end 16a, a second connecting end 16b and a third connecting end 16c. The first crank 16 is rotatably installed in the sewing machine shell through the first connecting end 16a, the second connecting end 16b is fixedly connected with the pull rope 4, and the third connecting end 16c is rotatably connected with the lifting front lever 17.

[0027] When the pull rope 4 drives the second connecting end 16b to move horizontally, the first crank 16 rotates around the first connecting end 16a, and the third connecting end 16c moves upward, thereby converting the horizontal movement of the pull rope 4 into the lifting movement of the lifting front lever 17.

[0028] The bottom of the lifting front lever 17 is provided with a presser foot assembly 18. When the lifting front lever 17 rises or falls, the presser foot assembly 18 also rises or falls, thereby realizing the lifting and pressing function of the presser foot.

[0029] The sewing machine shell is provided with a thread tensioner 19, and a thread loosening rod 20 is arranged in the thread tensioner 19. The rear end of the thread loosening rod 20 is provided with an inclined surface 20a, and the lifting front lever 17 is provided with a forward extending abutting portion 17a. The abutting portion 17a abuts against the inclined surface 20a. When the lifting front lever 17 rises, the abutting portion 17a rises along the inclined surface 20a. The abutting portion 17a drives the inclined surface 20a to move axially, and the thread loosening rod 20 drives the two thread clamping pieces of the thread tensioner 19 to separate, thereby realizing the thread loosening function of the thread tensioner 19.

[0030] The best embodiment of the utility model has been illustrated, and various changes or modifications made by those skilled in the art will not deviate from the scope of the utility model.

Claims

1. A presser foot lifting and thread loosening drive device for a sewing machine comprising an oil box (1) fixed to the lower surface of the bed plate, characterized in that: The oil box (1) is externally rotatably installed with a knee control shaft (2), the knee control shaft (2) is provided with a bidirectional crank (3), the oil box (1) is provided with a pull rope (4) penetratingly, one end of the pull rope (4) is connected with the bidirectional crank (3), the other end of the pull rope (4) is connected with a presser foot assembly (18).

2. The presser foot and thread tension drive apparatus according to claim 1, characterized by: The inner wall of the oil box (1) is provided with a mounting surface (1a), the mounting surface (1a) is provided with a mounting hole (1b), a fixed joint (9) is mounted in the mounting hole (1b), the pull rope (4) penetrates through the mounting hole (1b) and the fixed joint (9) in sequence; the pull rope (4) is provided with a pull rope protection rubber sleeve (11), one end of the pull rope protection rubber sleeve (11) is provided with a pull rope connecting piece (11a), the fixed joint (9) is locked and fixed with the pull rope connecting piece (11a) through a fixed sleeve (12); one end of the fixed sleeve (12) is provided with a locking nut (13), the locking nut (13) is locked with the outer wall of the pull rope connecting piece (11a).

3. The presser foot and thread tension drive apparatus according to claim 2, characterized by: An oil pad (10) is arranged between the fixed joint (9) and the mounting surface (1a); the pull rope protection rubber sleeve (11) is provided with an oil rubber sleeve (14), one end of the oil rubber sleeve (14) abuts against the mounting surface (1a), the other end of the oil rubber sleeve (14) locks the pull rope protection rubber sleeve (11) through a pipe clamp (15).

4. The presser foot and thread tension drive apparatus according to claim 3, characterized by: The bidirectional crank (3) is provided with a pull rope fixing part (3a), the pull rope fixing part (3a) is provided with a pull rope through hole (3b) for the pull rope (4) to penetrate through, a pull rope lock sleeve (7) is arranged below the pull rope fixing part (3a), one end of the pull rope (4) penetrates through the pull rope through hole (3b) and the pull rope lock sleeve (7) in sequence, the rope head of the pull rope (4) is folded into the pull rope lock sleeve (7) and is fixed and locked through an inner locking screw (8).

5. The presser foot and thread tension drive apparatus according to claim 4, characterized by: The first mounting part (9a) of the fixed joint (9) is mounted into the mounting hole (1b), the second mounting part (9b) of the fixed joint (9) abuts against the mounting surface (1a) through the oil pad (10), the third mounting part (9c) of the fixed joint (9) is locked and fixed with the pull rope connecting piece (11a) through the fixed sleeve (12).

6. The presser foot and thread tension drive apparatus according to claim 1, characterized by: The other end of the pull rope (4) is connected with a first crank (16), the first crank (16) is connected with a lifting front lever (17), the lifting front lever (17) is connected with the presser foot assembly (18).

7. The presser foot and thread tension drive apparatus according to claim 6, characterized in that in A thread tensioner (19) is mounted on the sewing machine shell, a thread loosening rod (20) penetrates through the thread tensioner (19), the rear end of the thread loosening rod (20) is provided with an inclined surface (20a), the lifting front lever (17) is provided with a forward extending abutting part (17a), the abutting part (17a) abuts against the inclined surface (20a).

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