Upper towing wheel feeding mechanism of differential feeding lockstitch sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to an upper tug feeding mechanism of a differential feeding lockstitch sewing machine, which comprises a casing, a spindle arranged in the casing, a tug seat arranged at the head of the casing, an upper tug group rotatably arranged in the tug seat, a mounting seat arranged on the side of the casing, and a cover plate arranged on the outer side of the mounting seat. An upper dragging wheel feeding mechanism is arranged in the mounting seat and comprises an upper feeding shaft rotatably arranged in the mounting seat, and one end of the upper feeding shaft is connected with an upper dragging wheel set through a transmission mechanism. The adjusting seat is driven to swing, the swing part is driven to swing through the rotating shaft while the adjusting seat swings, in other words, the swing amplitude of the upper feeding shaft is adjusted by changing the installation angles of the adjusting seat and the swing part, and finally the rotating speed of the upper towing wheel set is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field especially refers to a differential feeding flat bed sewing machine's upper tow wheel feeding mechanism. BACKGROUND

[0002] The traditional sewing machine feeding mode is the feeding of the feed dog, and part of the needle and presser foot participate in the feeding together with the feed dog. The feeding mode has limited feeding force, especially for the sewing material with special material, and the feeding is more difficult, which shows that the stitch is too small. Therefore, the upper tow wheel and the lower tow wheel are combined to feed the cloth in the prior art.

[0003] For example, Chinese invention, patent No. CN2017111198791, discloses a lower tow wheel synchronous feeding structure, which comprises a rotating shaft parallel to the upper tow wheel arranged in the sewing machine workbench and a lower tow wheel coaxially sleeved on the rotating shaft. The lower tow wheel is located directly below the upper tow wheel and is arranged opposite to the upper tow wheel. The rotating shaft is fixed with a swing rod. The swing rod and the main shaft of the sewing machine are provided with a transmission assembly for driving the swing rod to swing when the main shaft rotates. The rotating shaft and the lower tow wheel are provided with a one-way component for limiting the one-way rotation of the lower tow wheel when the swing rod swings.

[0004] The upper tow wheel rotates and feeds under the driving of the lower tow wheel, and cannot be controlled and adjusted independently. Therefore, the feeding speed of the upper tow wheel cannot be controlled and adjusted, which leads to unstable feeding in the actual working process. Therefore, the mechanism needs to be further improved. SUMMARY

[0005] The utility model aims at providing a differential feeding flat bed sewing machine's upper tow wheel feeding mechanism, which solves the problem of the lower tow wheel that cannot be adjusted and controlled through the adjusting piece.

[0006] The utility model discloses a differential feeding flat bed sewing machine's upper tow wheel feeding mechanism, including the casing, be provided with the main shaft in the casing, the machine head of casing is provided with the tow wheel seat, rotatablely be provided with upper tow wheel group in the tow wheel seat, the lateral surface of casing is provided with the mounting seat, the outside of mounting seat is provided with the apron, be provided with upper tow wheel feeding mechanism in the mounting seat, and upper tow wheel feeding mechanism includes rotatablely setting in the mounting seat upper feeding shaft, and one end of upper feeding shaft is connected with upper tow wheel group through transmission mechanism, the other end outer periphery of upper feeding shaft is installed with feeding crank, and the other end of feeding crank is connected with connecting rod no.

[0007] Preferably, the lateral surface of the adjusting seat is formed with a rotating column, the inner side of the apron is formed with a connecting rod three, and the other end of the connecting rod three is provided with a mounting cylinder for being sleeved on the outer periphery of the rotating column.

[0008] Preferably, the four peripheries of the apron are respectively provided with fastening holes one, and the outer side end face of the mounting seat is provided with a fastening hole two.

[0009] Preferably, the transmission mechanism includes an upper swing crank mounted on the outer periphery of the upper feeding shaft, the other end of the upper swing crank is connected with a feeding pull rod, the lower end of the feeding pull rod is connected with a lower swing crank, and the other end of the lower swing crank is connected with the upper tow wheel group.

[0010] Preferably, the upper tow wheel group includes a tow wheel and a one-way wheel arranged on the inner periphery thereof.

[0011] Preferably, a shaft sleeve is arranged between the outer periphery of the upper feeding shaft and the mounting seat.

[0012] The utility model discloses a differential feeding flat bed sewing machine's upper tow wheel feeding mechanism, including the casing, be provided with the main shaft in the casing, the machine head of casing is provided with the tow wheel seat, rotatablely be provided with upper tow wheel group in the tow wheel seat, the lateral surface of casing is provided with the mounting seat, the outside of mounting seat is provided with the apron, be provided with upper tow wheel feeding mechanism in the mounting seat, and upper tow wheel feeding mechanism includes rotatablely setting in the mounting seat upper feeding shaft, and one end of upper feeding shaft is connected with upper tow wheel group through transmission mechanism, the other end outer periphery of upper feeding shaft is installed with feeding crank, and the other end of feeding crank is connected with connecting rod no.

[0013] The utility model discloses a differential feeding flat bed sewing machine's upper tow wheel feeding mechanism, including the casing, be provided with the main shaft in the casing, the machine head of casing is provided with the tow wheel seat, rotatablely be provided with upper tow wheel group in the tow wheel seat, the lateral surface of casing is provided with the mounting seat, the outside of mounting seat is provided with the apron, be provided with upper tow wheel feeding mechanism in the mounting seat, and upper tow wheel feeding mechanism includes rotatablely setting in the mounting seat upper feeding shaft, and one end of upper feeding shaft is connected with upper tow wheel group through transmission mechanism, the other end outer periphery of upper feeding shaft is installed with feeding crank, and the other end of feeding crank is connected with connecting rod no. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1It is a structure schematic view of the flat sewing machine.

[0015] Figure 2 It is a structure schematic view of the upper drag wheel feeding mechanism Figure One .

[0016] Figure 3 It is a structure schematic view of the upper drag wheel feeding mechanism Figure Two .

[0017] Figure 4 It is a structure schematic view of the upper drag wheel feeding mechanism Figure Three .

[0018] Figure 5 It is an exploded structure schematic view of the upper drag wheel feeding mechanism.

[0019] The figure mark: 1 - the machine shell, 2 - the main shaft, 3 - the drag wheel seat, 4 - the upper drag wheel group, 5 - the mounting seat, 6 - the cover plate, 7 - the upper drag wheel feeding mechanism, 8 - the upper feeding shaft, 9 - the transmission mechanism, 10 - the feeding crank, 11 - the connecting rod one, 12 - the swing piece, 13 - the connecting rod two, 14 - the eccentric wheel, 15 - the rotating piece, 16 - the rotating shaft, 17 - the adjusting seat, 18 - the rotating column, 19 - the adjusting part, 20 - the adjusting piece, 21 - the adjusting through hole, 22 - the rotation limiting piece, 23 - the connecting rod three, 24 - the mounting cylinder, 25 - the fastening hole one, 27 - the upper swing crank, 28 - the feeding pull rod, 29 - the lower swing crank, 30 - the drag wheel, 31 - the one-way wheel, 32 - the shaft sleeve. DETAILED DESCRIPTION

[0020] The specific embodiment of the utility model is further explained in detail in combination with the drawings.

[0021] As Figures 1-5 shown, an upper drag wheel feeding mechanism of differential feeding flat sewing machine, including machine shell 1, the main shaft 2 is arranged in machine shell 1, the machine head of machine shell 1 is provided with drag wheel seat 3, and the upper drag wheel group 4 is rotatably arranged in drag wheel seat 3, and the upper drag wheel group 4 is located above the machine seat, can be cooperated with the lower drag wheel below, realizes synchronous feeding.

[0022] The side of the shell 1 is provided with a mounting seat 5, the outer side of the mounting seat 5 is provided with a cover plate 6, the mounting seat 5 is provided with an upper drag wheel feeding mechanism 7, the upper drag wheel feeding mechanism 7 comprises an upper feeding shaft 8 rotatably arranged in the mounting seat 5, one end of the upper feeding shaft 8 is connected with the upper drag wheel group 4 through a transmission mechanism 9, so as to drive the upper drag wheel group 4 to rotate, the other end of the upper feeding shaft 8 is provided with a feeding crank 10, the other end of the feeding crank 10 is connected with a connecting rod one 11, the other end of the connecting rod one 11 is connected with a swing piece 12, the other end of the swing piece 12 is connected with a connecting rod two 13, the other end of the connecting rod two 13 is formed with an eccentric wheel 14 used for connecting with the main shaft 2 and synchronously rotating, so that when the main shaft 2 rotates, the upper feeding shaft 8 is driven to reciprocate left and right through the eccentric wheel 14, the connecting rod two 13, the swing piece 12, the connecting rod one 11 and the feeding crank 10, the main shaft 2 in the sewing machine is used as a power source for driving the upper feeding shaft 8 and the upper drag wheel group 4 to move, and a separate power source is not needed to control, the structure is simple, and the cost can be reduced.

[0023] The middle part of the swing piece 12 is provided with a rotating piece 15, a rotating shaft 16 is arranged in the rotating piece 15, the two ends of the rotating shaft 16 are connected with an adjusting seat 17, the side of the adjusting seat 17 is rotatably connected with the mounting seat 5 through a rotating column 18, one end of the adjusting seat 17 is formed with an adjusting part 19, the adjusting part 19 is screwed with an adjusting piece 20, the cover plate 6 is provided with an adjusting through hole 21 for the adjusting piece 20 to extend out, and the outer periphery of the adjusting piece 20 is screwed with a limiting rotating piece 22, and the limiting rotating piece 22 is arranged in the adjusting through hole 21.

[0024] The design of the adjusting piece 20 can realize the adjustment of the swing amplitude of the upper feeding shaft 8 by rotating the adjusting piece 20 to drive the adjusting seat 17 to swing and drive the swing piece 12 to swing through the rotating shaft 16, and finally realize the adjustment of the rotating speed of the upper drag wheel group 4 by changing the installation angle of the adjusting seat 17 and the swing piece 12.

[0025] The side of the adjusting seat 17 is formed with the rotating column 18, the inner side of the cover plate 6 is formed with a connecting rod three 23, the other end of the connecting rod three 23 is provided with a mounting cylinder 24 for being sleeved on the outer periphery of the rotating column 18, so as to realize the rotating installation of the adjusting seat 17, and the mounting structure is simple and convenient to disassemble and assemble.

[0026] The four peripheries of the cover plate 6 are provided with fastening holes one 25, and the outer side end face of the mounting seat 5 is provided with fastening holes two, so that the cover plate 6 and the mounting seat 5 can be fixedly connected through the fastening of fasteners in the fastening holes in the actual installation process.

[0027] The transmission mechanism 9 comprises an upper swing crank 27 mounted on the outer periphery of the upper feeding shaft 8, the other end of the upper swing crank 27 being connected with a feeding pull rod 28, the lower end of the feeding pull rod 28 being connected with a lower swing crank 29, the other end of the lower swing crank 29 being connected with the upper pulley set 4, so that the left and right reciprocating swing of the upper feeding shaft 8 is converted into the rotation of the upper pulley set 4.

[0028] The upper pulley set 4 comprises a pulley 30 and a one-way wheel 31 arranged on the inner periphery of the pulley 30, the other end of the lower swing crank 29 being firstly connected with the one-way wheel 31, and then driving the pulley 30 to rotate in one direction through the one-way wheel 31.

[0029] The outer periphery of the upper feeding shaft 8 is provided with a shaft sleeve 32 between the mounting seat 5, so as to improve the stability during rotation.

[0030] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only for illustrating the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed for protection. The protection scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims

1. An upper idler feed mechanism for a differential feed flat bed sewing machine, characterized by, The utility model relates to a kind of upper drag wheel feeding mechanism, including shell (1), main shaft (2) is provided in shell (1), the head of shell (1) is provided with drag wheel seat (3), upper drag wheel group (4) is rotatably arranged in drag wheel seat (3), the side of shell (1) is provided with mounting seat (5), the outside of mounting seat (5) is provided with cover plate (6), upper drag wheel feeding mechanism (7) is provided in mounting seat (5), and upper drag wheel feeding mechanism (7) includes rotatably arranged in mounting seat (5) upper feeding shaft (8), one end of upper feeding shaft (8) is connected with upper drag wheel group (4) by transmission mechanism (9);The other end of upper feeding shaft (8) is installed with feeding crank (10) on outer periphery, the other end of feeding crank (10) is connected with connecting rod one (11), the other end of connecting rod one (11) is connected with swing piece (12), the other end of connecting rod two (13) is connected with swing piece (12), and the other end of connecting rod two (13) is formed with eccentric wheel (14) for being connected with main shaft (2) and synchronous rotation;The middle part of swing piece (12) is provided with rotating part (15), rotating shaft (16) is penetrated in rotating part (15), and the both ends of rotating shaft (16) are connected with adjusting seat (17), and the side of adjusting seat (17) is rotatably connected with mounting seat (5) by rotating column (18), and one end of adjusting seat (17) is formed with adjusting part (19), and adjusting part (19) is screwed with adjusting member (20), adjusting hole (21) for adjusting member (20) to extend is set up on the cover plate (6), and the outer periphery of adjusting member (20) is screwed with limited rotating part (22), and limited rotating part (22) is arranged in adjusting hole (21).

2. The upper drag wheel feed mechanism of a differential feed flat bed sewing machine according to claim 1, wherein: The side of adjusting seat (17) is formed with rotating column (18), and the inner side of cover plate (6) is formed with connecting rod three (23), and the other end of connecting rod three (23) is provided with mounting cylinder (24) for being set on the outer periphery of rotating column (18).

3. The upper drag wheel feed mechanism of a differential feed flat bed sewing machine according to claim 2, wherein: The periphery of cover plate (6) is respectively provided with fastening hole one (25), and the outer side end face of mounting seat (5) is provided with fastening hole two.

4. The upper drag wheel feed mechanism of a differential feed flat bed sewing machine according to claim 1, wherein: The transmission mechanism (9) includes upper swing crank (27) installed on the outer periphery of upper feeding shaft (8), the other end of upper swing crank (27) is connected with feeding pull rod (28), the lower end of feeding pull rod (28) is connected with lower swing crank (29), and the other end of lower swing crank (29) is connected with upper drag wheel group (4).

5. The upper drag wheel feed mechanism of a differential feed flat bed sewing machine according to claim 1 or 4 wherein: The upper drag wheel group (4) includes drag wheel (30) and unidirectional wheel (31) arranged on its inner periphery.

6. The upper drag wheel feed mechanism of a differential feed flat bed sewing machine according to claim 1 wherein: The outer periphery of upper feeding shaft (8) and mounting seat (5) are provided with shaft sleeve (32).

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