Feeding tool sinking device of sewing machine

Abstract

The invention relates to a feeding tool sinking device of a sewing machine, which comprises a feeding tool mechanism and a pulling mechanism, and the feeding tool mechanism comprises a cloth feeding table, cloth feeding teeth, a shaft rod and a rocker arm; the pulling mechanism comprises a pull rod, a connecting rod, a traction piece and a steel cable, the pull rod is pivoted with the base and connected with the presser foot mechanism, two ends of the connecting rod are respectively connected with the pull rod and the traction piece, and two ends of the steel cable are respectively connected with the traction piece and the rocker arm; when the presser foot is lifted upwards, the presser foot mechanism drives the pull rod and the connecting rod to move downwards, the traction piece is driven by the connecting rod to rotate, and the steel cable drives the rocker arm and the shaft rod to rotate together under the rotating action of the traction piece and enables the cloth feeding teeth to sink into the surface of the needle plate. Therefore, the cloth placing space can be increased for placing the sewing material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewing machines, and particularly relates to a feed dog sinking device of a sewing machine. BACKGROUND

[0002] The existing sewing machine is provided with a main feed table and a differential feed table. The end of the main feed table is connected with a main feed dog, and the end of the differential feed dog frame is connected with a differential feed dog. The main feed dog and the differential feed dog together form a feed dog group. The main feed table and the differential feed table are driven by an eccentric shaft on a main shaft through a sliding block. The two ends of the sliding block are fastened with a check ring. After the angle of the eccentric shaft is adjusted, it is fixed with a screw, so that the angle between the main feed dog and the differential feed dog and the upper surface of the needle plate is fixed.

[0003] Under normal use of the sewing machine, when the needle bar moves to the maximum stroke and is located at the highest position, the main feed dog and the differential feed dog are generally 0.8-1.5 mm higher than the upper surface of the needle plate. When the presser foot is lifted to a certain height, the thickness of the sewing material that can be put into the space between the presser foot plate and the needle plate should theoretically be the distance between the lower surface of the presser foot plate and the upper surface of the needle plate. However, because the needle bar is located at the highest position when the presser foot is lifted, and the main feed dog and the differential feed dog are 0.8-1.5 mm higher than the needle plate, the actual thickness of the sewing material that can be put into the space between the presser foot plate and the needle plate is reduced by 0.8-1.5 mm, thereby causing the sewing material to be difficult to be put into the space between the presser foot plate and the needle plate before the sewing starts.

[0004] Therefore, how to overcome the problem of insufficient space between the presser foot plate and the needle plate is a technical problem to be solved by the present application. SUMMARY

[0005] One object of the present application is to provide a feed dog sinking device of a sewing machine, which sinks the feed dog into the surface of the needle plate during the lifting of the presser foot mechanism, so as to form a larger space to provide the sewing material.

[0006] In order to achieve the above-mentioned object, the present application provides a feed dog sinking device of a sewing machine. The sewing machine has a machine base, a needle plate and a presser foot mechanism. The presser foot mechanism has a presser foot. The feed dog sinking device includes a feed dog mechanism and a pulling mechanism. The feed dog mechanism includes a feed table, a feed dog, a shaft rod and a rocker arm. The feed dog is connected to one end of the feed table. The two ends of the shaft rod are respectively connected to the rocker arm and the other end of the feed table. The pulling mechanism is arranged in the machine base. The pulling mechanism includes a pull rod, a connecting rod, a pulling member and a steel cable. The pull rod is pivotally connected to the machine base and connected to the presser foot mechanism. The two ends of the connecting rod are respectively connected to the pull rod and the pulling member. The two ends of the steel cable are respectively connected to the pulling member and the rocker arm. When the presser foot is lifted upward, the pull rod and the connecting rod are driven downward by the presser foot mechanism. The pulling member is rotated under the driving of the connecting rod. The steel cable is rotated under the rotation of the pulling member, thereby driving the rocker arm and the shaft rod to rotate together, and sinking the feed dog into the surface of the needle plate.

[0007] In one embodiment, the pulling mechanism further comprises a fixed plate, the presser foot mechanism further comprises a connecting arm, the fixed plate is fixed on the machine base and corresponds to the arrangement of the connecting arm, the pulling member and one end of the steel cable are arranged on the fixed plate.

[0008] In one embodiment, the pulling mechanism further comprises a gear adjusting plate, the gear adjusting plate is fixed on the machine base and corresponds to the arrangement of the connecting arm.

[0009] In one embodiment, the pulling member is an L-shaped plate, the pulling member is pivotally fixed on the fixed plate by a bolt, one end of the pulling member is pivotally fixed on the connecting arm by another bolt, and the other end of the pulling member is connected with the steel cable.

[0010] In one embodiment, the pulling mechanism further comprises a tension spring, the pulling member is formed with a folding plate, the steel cable comprises a sleeve tube, a core wire and a clamping member, one end of the sleeve tube is fixed on the fixed plate, the core wire is movably arranged in the sleeve tube, one end of the core wire is connected with the folding plate and the tension spring, and the other end of the core wire is fixed by the clamping member, and the tension spring is elastically clamped between the clamping member and the folding plate.

[0011] In one embodiment, the pulling mechanism further comprises a gear adjusting plate, the gear adjusting plate is fixed on the machine base, the steel cable further comprises another clamping member, the other end of the sleeve tube is fixed on the gear adjusting plate, the other end of the core wire is connected with the connecting arm and fixed by the other clamping member.

[0012] In one embodiment, the feeding mechanism further comprises a reset spring, the pulling mechanism further comprises a plurality of bolts, the reset spring has a first hook arm and a second hook arm, the reset spring is sleeved on the shaft, the first hook arm hooks the bolts, and the second hook arm hooks the connecting arm.

[0013] In one embodiment, the pulling mechanism further comprises a gear adjusting plate, the gear adjusting plate is fixed on the machine base and corresponds to the arrangement of the connecting arm, and the connecting arm is movably arranged between the machine base and the gear adjusting plate.

[0014] In one embodiment, the gear adjusting plate is provided with a guide groove, and a gear adjusting screw is arranged in the guide groove to stop the swing angle of the connecting arm.

[0015] In one embodiment, the feeding mechanism further comprises a reset spring, the pulling mechanism further comprises a plurality of bolts, the gear adjusting plate is fixed on the machine base by the bolts, the reset spring has a first hook arm and a second hook arm, the reset spring is sleeved on the shaft, the first hook arm hooks the bolts, and the second hook arm hooks the connecting arm.

[0016] The application also has the following effects: it can easily feed the sewing material between the presser foot plate and the needle plate before sewing starts, especially for some soft and thick fabrics. The overall structure is simple and easy to adjust, and it can be realized without professional maintenance technicians. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Figure 1 is a perspective view of a sewing machine with a feed sink device according to the present application.

[0018] Figure 2 Figure 2 is a perspective view of a sewing machine with a feed sink device according to the present application combined with a machine base.

[0019] Figure 3 Figure 3 is another perspective view of a sewing machine with a feed sink device according to the present application. Figure 2

[0020] Figure 4 Figure 4 is a front view of a sewing machine with a feed sink device according to the present application combined.

[0021] Figure 5 Figure 5 is a side view of a sewing machine with a feed sink device according to the present application combined.

[0022] Figure 6 Figure 6 is a front view of a sewing machine with a feed sink device according to the present application combined in use.

[0023] Figure 7 Figure 7 is a side view of a sewing machine with a feed sink device according to the present application combined in use.

[0024] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0025] 1: feed sink device

[0026] 10: feed mechanism

[0027] 11: feed table

[0028] 111: opening

[0029] 12: feed teeth

[0030] 13: shaft rod

[0031] 14: rocker arm

[0032] 15: slider

[0033] 16: return spring

[0034] 161: first hook arm

[0035] 162: second hook arm

[0036] 30: pulling mechanism

[0037] 31: pull rod

[0038] 32: connecting rod

[0039] 33: puller

[0040] 34: cable​

[0041] 341: outer sleeve;

[0042] 342: core wire;

[0043] 343: clamping member;

[0044] 35: fixing plate;

[0045] 36: gear adjusting plate;

[0046] 361: guide groove;

[0047] 37: tension spring;

[0048] 38: stud;

[0049] 39: gear adjusting screw;

[0050] 8: sewing machine;

[0051] 81: machine base;

[0052] 82: main shaft;

[0053] 83: needle plate;

[0054] 831: toothed groove;

[0055] 84: transmission mechanism;

[0056] 85: presser foot mechanism;

[0057] 851: presser foot;

[0058] 8511: presser foot arm;

[0059] 8512: presser foot plate;

[0060] 852: rotating arm;

[0061] 853: pressure adjusting member;

[0062] 854: connecting arm;

[0063] 855: hook strip. DETAILED DESCRIPTION

[0064] The detailed description and technical content of the present application are described below in conjunction with the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present application.

[0065] Please refer to Figures 1 to 5As shown, the present application provides a sinker lowering device of a sewing machine, which is installed on a sewing machine 8 having a machine base 81, a main shaft 82, a needle plate 83, a transmission mechanism 84, a presser foot mechanism 85 and other related components or / and devices, the main shaft 82 is arranged through the machine base 81, the transmission mechanism 84 is connected to and driven by the main shaft 82, the needle plate 83 is fixed on a sewing platform of the machine base 81, and a plurality of tooth grooves 831 are arranged on the needle plate 83, the presser foot mechanism 85 mainly includes a presser foot 851, a rotating arm 852, a pressure adjusting member 853, a connecting arm 854 and a hook strip 855, the presser foot 851 mainly includes a presser foot arm 8511 and a presser foot plate 8512, wherein the rotating arm 852 is rotatably connected to the machine base 81, the presser foot 851 and the connecting arm 854 are respectively connected to two ends of the rotating arm 852, the pressure adjusting member 853 is connected to one end of the presser foot arm 8511 away from the rotating arm 852, the presser foot plate 8512 is connected to the presser foot arm 8511 and located outside the pressure adjusting member 853, and the presser foot plate 8512 is operatively arranged above the needle plate 83. Since the structure of this part is prior art, it will not be described in detail.

[0066] The sinker lowering device 1 of the present application mainly includes a feed mechanism 10 and a pulling mechanism 30.

[0067] The feed mechanism 10 mainly includes a feed table 11, a feed tooth 12, a shaft rod 13, a rocker arm 14 and a sliding block 15, the feed tooth 12 is connected to one end of the feed table 11, and the shaft rod 13 is connected to the other end of the feed table 11 and the rocker arm 14. The feed table 11 is provided with an opening 111 at one end away from the feed tooth 12, and the shaft rod 13 is connected to the feed table 11 through the sliding block 15. The shaft rod 13 is an eccentric shaft rod, and the eccentric amount thereof can be rotated to make the feed tooth 12 protrude above the surface of the needle plate 83.

[0068] The pulling mechanism 30 is arranged on the machine base 81, and mainly includes a pull rod 31, a connecting rod 32, a pulling member 33 and a steel cable 34, one end of the pull rod 31 is pivotally connected to the aforementioned machine base 81, and is connected to the connecting arm 854 of the presser foot mechanism 85 through the aforementioned hook strip 855, two ends of the connecting rod 32 are respectively connected to the pull rod 31 and the pulling member 33, and two ends of the steel cable 34 are respectively connected to the pulling member 33 and one end of the rocker arm 14 away from the shaft rod 13.

[0069] In one embodiment, the pulling mechanism 30 further includes a fixing plate 35, which is fixed on the machine base 81 and corresponds to the connecting arm 854 of the presser foot mechanism 85, and provides the pulling member 33 and one end of the steel cable 34 to be arranged, wherein the pulling member 33 is an L-shaped plate, which is pivotally connected to the fixing plate 35 through a bolt, one end of the pulling member 33 is pivotally connected to one end of the connecting rod 32 through a bolt, the other end of the pulling member 33 is provided for the steel cable 34 to be connected, and a folded plate 331 is formed on the pulling member 33; the other end of the connecting rod 32 is pivotally connected to one end of the pull rod 31 away from the hook strip 855 through a bolt.

[0070] In one embodiment, the pulling mechanism 30 further comprises a gear adjusting plate 36, which is fixed on the base 81 and corresponds to the rocker arm 14 of the feed mechanism 10, and provides the other end of the cable 34 with a mounting, and the rocker arm 14 is movably formed between the base 81 and the gear adjusting plate 36.

[0071] In one embodiment, the pulling mechanism 30 further comprises a tension spring 37, and the cable 34 mainly comprises a sheath tube 341, a core wire 342 and two clamping members 343, wherein the two ends of the sheath tube 341 are fixed on the fixed plate 35 and the gear adjusting plate 36 respectively, the core wire 342 is movably threaded through the sheath tube 341, and one end of the core wire 342 is threaded through the folded plate 331 of the pulling member 33 and the tension spring 37, and is fixed by the clamping member 343, and the tension spring 37 is elastically clamped between the clamping member 343 and the folded plate 331 of the pulling member 33. The other end of the core wire 342 is threaded through the rocker arm 14 and is fixed by the clamping member 343.

[0072] In one embodiment, the feed mechanism 10 further comprises a reset spring 16, and the pulling mechanism 30 further comprises a plurality of studs 38, and the gear adjusting plate 36 is fixed on the base 81 through the studs 38, and the reset spring 16 has a first hook arm 161 and a second hook arm 162, and the reset spring 16 is sleeved on the shaft 13, the first hook arm 161 hooks the stud 38 therein, and the second hook arm 162 hooks the rocker arm 14.

[0073] In one embodiment, the gear adjusting plate 36 is provided with a guide groove 361, and a gear adjusting screw 39 is mounted in the guide groove 361, which is used to stop the swing angle of the rocker arm 14, so that it can be applied to the occasion where the feed teeth 12 needs to be adjusted slightly.

[0074] Please refer to Figure 6 and Figure 7 When the presser foot 851 is lifted upward in use, the rotation of the rotating arm 852 causes the connecting arm 854 to rotate with it, which makes the hook strip 855 press the pull rod 31 downward, and the pull rod 31 rotates around the pivot joint with the base 81 and drives the connecting rod 32 downward, and the pulling member 33 rotates under the driving of the connecting rod 32, and the cable 34 rotates the rocker arm 14 and the shaft 13 together under the rotation of the pulling member 33, and the feed teeth 12 sink into the surface of the needle plate 83.

[0075] The above description is only the preferred embodiment of the present application, and is not used to limit the patent scope of the present application, and other equivalent changes made by using the patent spirit of the present application should also belong to the patent scope of the present application.

Claims

1. A feed sinker for a sewing machine, characterized by: The sewing machine has a machine base, a needle plate and a presser foot mechanism, the presser foot mechanism has a presser foot, the feed sinker device comprises: a feed mechanism, which comprises a feed table, a feed dog, a shaft and a rocker, the feed dog is connected to one end of the feed table, and two ends of the shaft are respectively connected to the rocker and the other end of the feed table; and a pulling mechanism arranged in the machine base, the pulling mechanism comprises a pull rod, a connecting rod, a pulling member and a steel cable, the pull rod is pivotally connected to the machine base and connected to the presser foot mechanism, two ends of the connecting rod are respectively connected to the pull rod and the pulling member, and two ends of the steel cable are respectively connected to the pulling member and the rocker; wherein when the presser foot is lifted upward, the pull rod and the connecting rod are driven downward by the presser foot mechanism, the pulling member is rotated under the driving of the connecting rod, and the steel cable drives the rocker and the shaft to rotate together, and the feed dog sinks into the surface of the needle plate.

2. The sinker device for a sewing machine according to claim 1, wherein The pulling mechanism further comprises a fixed plate, the presser foot mechanism further has a linkage arm, the fixed plate is fixed to the machine base and arranged corresponding to the linkage arm, and one end of the pulling member and the steel cable is arranged in the fixed plate.

3. The sinker device for a sewing machine according to claim 2, wherein The pulling mechanism further comprises a gear adjustment plate, the gear adjustment plate is fixed to the machine base and arranged corresponding to the rocker.

4. The sinker device for a sewing machine according to claim 2, wherein The pulling member is an L-shaped plate, which is pivotally connected to the fixed plate by a bolt, one end of the pulling member is pivotally connected to the connecting rod by another bolt, and the other end of the pulling member is connected to the steel cable.

5. The sinker device for a sewing machine according to claim 4, wherein The pulling mechanism further comprises a tension spring, the pulling member is formed with a folding plate, the steel cable comprises an outer sleeve, a core wire and a clamping member, one end of the outer sleeve is fixed to the fixed plate, the core wire is movably arranged in the outer sleeve, one end of the core wire is connected to the folding plate and the tension spring, and the core wire is fixed by the clamping member, and the tension spring is elastically clamped between the clamping member and the folding plate.

6. The sinker device for a sewing machine according to claim 5, wherein The pulling mechanism further comprises a gear adjustment plate, the gear adjustment plate is fixed to the machine base, the steel cable further comprises another clamping member, the other end of the outer sleeve is fixed to the gear adjustment plate, and the other end of the core wire is connected to the rocker and fixed by the other clamping member.

7. The sinker device for a sewing machine according to claim 6, wherein The feed mechanism further comprises a return spring, the pulling mechanism further comprises a plurality of studs, the return spring has a first hook arm and a second hook arm, the return spring is sleeved on the shaft, the first hook arm hooks the studs, and the second hook arm hooks the rocker.

8. The sinker device for a sewing machine according to claim 1, wherein The pulling mechanism further comprises a gear adjustment plate, the gear adjustment plate is fixed to the machine base and arranged corresponding to the rocker, and the rocker is movably arranged between the machine base and the gear adjustment plate.

9. The sinker device for a sewing machine according to claim 8, wherein The gear adjustment plate is provided with a guide groove, and a gear adjustment screw is arranged in the guide groove, so as to stop the swing angle of the rocker.

10. The sinker device for a sewing machine according to claim 8, wherein The feeding mechanism further comprises a reset spring, the pulling mechanism further comprises a plurality of studs, the gear adjusting plate is fixed to the machine base through the studs, the reset spring has a first hook arm and a second hook arm, the reset spring is sleeved with the shaft rod, the first hook arm hooks the stud therein, and the second hook arm hooks the rocker arm.

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