Lower 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 a lower dragging wheel feeding mechanism of a differential feeding lockstitch sewing machine, which comprises a dragging wheel shaft and a one-way transmission wheel set, a lower dragging wheel is arranged on the periphery of the dragging wheel shaft, the other end of the one-way transmission wheel set is connected with a first connecting rod, and the other end of the first connecting rod is connected with a second connecting rod. The other end of the second connecting rod is provided with a rotary adjusting piece, an adjusting shaft is formed at the eccentric position of the rotary adjusting piece, the periphery of the adjusting shaft is connected with a swing rod, and the swing rod is used for being connected with a feeding shaft and can be driven by the feeding shaft to swing in a reciprocating mode. The feeding speed of the lower dragging wheel can be adjusted by adjusting the angle of the rotary adjusting piece, changing the installation angle among the first connecting rod, the second connecting rod and the swing rod and adjusting the rotation angle of the lower dragging wheel in each swing process by adjusting the swing amplitude, the feeding speed of the lower dragging wheel is adjusted, the adjusting structure is simple, and adjusting operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a lower roller feeding mechanism for a differential feeding sewing machine. Background Technology

[0002] During the sewing process, relying solely on the sewing machine's built-in feeding system cannot guarantee the flatness of the sewn fabric. This is especially true for heavy fabrics such as curtains, which can easily lead to a high defect rate. Therefore, in practical applications, manual dragging of the fabric or the installation of a drag wheel drive mechanism that can assist in dragging the fabric is necessary.

[0003] For example, Chinese invention patent number CN201711119879.1 discloses a lower drag wheel synchronous feeding structure, which includes a rotating shaft parallel to the upper drag wheel and a lower drag wheel coaxially sleeved on the rotating shaft, which is inserted into the sewing machine worktable. The lower drag wheel is located directly below the upper drag wheel and is arranged opposite to the upper drag wheel. The characteristic is that a swing arm is fixed on the rotating shaft. A transmission component is provided between the swing arm and the main shaft of the sewing machine to drive the swing arm to swing when the main shaft rotates. A one-way component is provided between the rotating shaft and the lower drag wheel to limit the lower drag wheel to always rotate in one direction when the swing arm swings. A slot is opened on the swing arm extending along its length direction. A second hinge shaft passes through the slot. By adjusting the position of the second hinge shaft in the slot, the swing angle of the swing arm can be adjusted.

[0004] For example, Chinese utility model patent CN201920395478.7 discloses a lower roller synchronous feeding structure for a sewing machine. The sewing machine includes a main shaft, and the lower roller synchronous feeding structure includes a roller shaft and a lower roller that can rotate unidirectionally and is sleeved on the roller shaft. The lower roller synchronous feeding structure is characterized by further including a bend shaft, which is parallel to and spaced apart from the main shaft and connected to it by an eccentric wheel assembly. A first swing link is fixedly provided at the end of the bend shaft, and a second swing link is fixedly provided on the roller shaft. The first swing link and the second swing link are connected by a connecting rod. When the position of the second ball pin is adjusted in the second waist-shaped hole, the swing angle of the second swing link can be directly affected, which ultimately affects the amount of fabric pulled by the lower roller.

[0005] The above structures all achieve the effect of adjusting the feeding speed of the lower traction wheel by adjusting the position of the hinge shaft in the waist-shaped hole. In the actual adjustment process, it is necessary to first loosen the fixing nuts and fasteners on both sides of the hinge shaft, then move the hinge shaft, and then tighten the fixing nuts. This adjustment operation is complicated and cumbersome, so the structure needs further improvement. Utility Model Content

[0006] The purpose of this invention is to provide a lower roller feeding mechanism for a differential feeding flat sewing machine, which solves the problems of complex structure and cumbersome operation by using a rotating adjustment component.

[0007] The purpose of this utility model is achieved as follows: A lower roller feeding mechanism for a differential feeding flat sewing machine includes a roller shaft and a one-way transmission wheel set, which are rotatably arranged below the machine base. A lower roller is installed on the outer periphery of the roller shaft. One end of the one-way transmission wheel set is connected to the roller shaft and is used to drive it to rotate synchronously. The other end of the one-way transmission wheel set is connected to a connecting rod one, and the other end of the connecting rod one is connected to a connecting rod two. A rotary adjustment component is installed on the other end of the connecting rod two. An adjustment shaft is formed at the eccentric part of the rotary adjustment component. A swing rod is connected to the outer periphery of the adjustment shaft. The swing rod is used to connect to the feeding shaft and can be driven by the feeding shaft to swing back and forth.

[0008] Preferably, a hinge shaft is provided between the first connecting rod and the second connecting rod, and the other end of the second connecting rod is provided with a mounting hole for installing a rotary adjustment component. The outer end of the rotary adjustment component is formed with an adjustment part, and one end of the swing rod is provided with a mounting hole for installing an adjustment shaft.

[0009] Preferably, the adjusting part is formed with an adjusting groove, and the side wall of the second mounting hole is provided with a fastening hole.

[0010] Preferably, the unidirectional transmission wheel set includes a wheel frame, a transmission wheel shaft is disposed inside the wheel frame, and a drive wheel and a unidirectional wheel for driving the drive wheel to rotate in one direction are respectively mounted on the outer periphery of the transmission wheel shaft.

[0011] Preferably, a driven wheel is provided at one end of the haul wheel shaft, and a drive belt connects the driven wheel and the driving wheel.

[0012] Preferably, one end of the connecting rod is formed with a sleeve portion for mounting on the outer periphery of the one-way wheel.

[0013] Preferably, a wheel seat is provided below the base, the wheel seat contains the towing wheel shaft, and bearings are provided between the two ends of the towing wheel shaft and the wheel seat.

[0014] Preferably, the swing arm has an inner mounting cylinder for mounting on the outer periphery of the feed shaft, and the other end of the swing arm has a connecting portion for connecting to the tooth holder seat.

[0015] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0016] This utility model, through the design of a rotary adjustment component, allows for the adjustment of the angle of the rotary adjustment component during actual operation. This changes the installation angle between connecting rod one, connecting rod two, and swing rod, and by adjusting the swing amplitude, the rotation angle of the lower trolley during each swing can be adjusted, thereby regulating the feeding speed of the lower trolley. The adjustment structure is simple and the adjustment operation is convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a sewing machine.

[0018] Figure 2 Schematic diagram of the three-dimensional structure of the lower tugboat feeding mechanism Figure 1 .

[0019] Figure 3 This is an exploded view of the components of the lower tugboat feeding mechanism.

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0021] Figure 5 This is a structural diagram of the rocker arm, connecting rod 2, and rotary adjustment component.

[0022] Reference numerals in the attached diagram: 1-Base; 2-Drag wheel shaft; 3-One-way transmission wheel set; 4-Lower drag wheel; 5-Connecting rod one; 6-Connecting rod two; 7-Rotation adjustment component; 8-Adjusting shaft; 9-Swing arm; 10-Feeding shaft; 11-Hingle shaft one;

[0023] 12-Mounting hole one; 13-Adjusting part; 14-Mounting hole two; 15-Adjusting groove; 16-Fastening hole; 17-Wheel frame; 18-Drive wheel shaft; 19-Driving wheel; 20-One-way wheel; 21-Driven wheel; 22-Drive belt; 23-Sleeve part; 24-Wheel seat; 25-Bearing; 26-Mounting sleeve; 27-Connecting part; 28-Tooth bracket seat. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a lower drag wheel feeding mechanism of a differential feeding flat sewing machine includes a drag wheel shaft 2 and a one-way transmission wheel set 3, which are rotatably disposed below the machine base 1. A lower drag wheel 4 for conveying fabric is installed on the outer periphery of the drag wheel shaft 2. One end of the one-way transmission wheel set 3 is connected to the drag wheel shaft 2 and is used to drive it to rotate synchronously. The other end of the one-way transmission wheel set 3 is connected to a connecting rod 5. The other end of the connecting rod 5 is connected to a connecting rod 6. A rotation adjustment component 7 is installed on the other end of the connecting rod 6. An adjustment shaft 8 is formed at the eccentric part of the rotation adjustment component 7. A swing rod 9 is connected to the outer periphery of the adjustment shaft 8. The swing rod 9 is used to connect to the feeding shaft 10 and can be driven by the feeding shaft 10 to swing back and forth.

[0026] This utility model, through the design of a rotary adjustment component, allows for the adjustment of the angle of the rotary adjustment component 7 during actual operation. This changes the installation angle between connecting rod 5, connecting rod 6, and swing rod 9. By adjusting the swing amplitude, the rotation angle of the lower trolley 5 during each swing can be adjusted, thereby regulating the feeding speed of the lower trolley 5. This adjustment structure is simple and the adjustment operation is convenient.

[0027] In actual operation, the feeding shaft 10 can drive the swing arm 9, the second connecting rod 6, and the first connecting rod 5 to swing back and forth. Through the design of the one-way transmission wheel set 3, when the swing arm 9 swings forward, it can drive the one-way transmission wheel set 3 to rotate. When the swing arm 9 swings in the opposite direction, it will not drive the one-way transmission wheel set 3 to rotate, thereby driving the lower traction wheel 4 to maintain one-way rotation and realize the feeding action.

[0028] A hinge shaft 11 is provided between connecting rod 5 and connecting rod 6. The other end of connecting rod 6 has a mounting hole 12 for mounting the rotary adjustment component 7. The outer end of the rotary adjustment component 7 is formed with an adjustment part 13 to facilitate adjustment of the angle of the rotary adjustment component 7. One end of the swing rod 9 has a mounting hole 14 for mounting the adjustment shaft 8. This technical solution achieves the effect of adjusting the installation angle between connecting rod 5, connecting rod 6, and swing rod 9 during the rotation of the rotary adjustment component 7 by using an eccentrically set adjustment shaft. Compared with the prior art that uses the adjustment of the hinge shaft in the waist-shaped hole, the adjustment operation of this technical solution is simpler, the number of parts is reduced, and the cost is lower.

[0029] The adjustment part 13 is formed with an adjustment groove 15. The adjustment groove 15 is in the shape of a straight line or a cross, so as to facilitate adjustment with a screwdriver. The side wall of the mounting hole 14 is provided with a fastening hole 16. A fastener for fixing the adjustment shaft 8 is installed in the fastening hole 16. In the actual adjustment process, the fastener needs to be loosened first, and then the rotating adjustment part 7 is adjusted.

[0030] The unidirectional transmission wheel set 3 includes a wheel frame 17 for fixing on the lower end face of the base 1. A transmission wheel shaft 18 is provided inside the wheel frame 17. A drive wheel 19 and a unidirectional wheel 20 for driving the drive wheel 19 to rotate in one direction are respectively installed on the outer periphery of the transmission wheel shaft 18. This technical solution can reduce the failure rate and maintenance cost by designing the drive wheel 19 and the unidirectional wheel 20 separately.

[0031] One end of the towing wheel shaft 2 is provided with a driven wheel 21, and a transmission belt 22 is connected between the driven wheel 21 and the driving wheel 19, thereby driving the towing wheel shaft 2 and the lower towing wheel 4 to rotate synchronously and realize the feeding action.

[0032] One end of the connecting rod 5 is formed with a sleeve portion 23 for mounting on the outer periphery of the one-way wheel 20. The sleeve portion 23 and the one-way wheel 20 are connected by a keyway.

[0033] A wheel seat 24 is provided below the base 1, and the wheel axle 2 is provided inside the wheel seat 24. Bearings 25 are provided between the two ends of the wheel axle 2 and the wheel seat 24 to improve its stability during rotation.

[0034] The swing arm 9 has an inner mounting cylinder 26 for mounting on the outer periphery of the feeding shaft 10, and the other end of the swing arm 9 has a connecting part 27 for connecting to the tooth holder 28. The feeding shaft 10 provides power to the feeding tooth and the drag wheel respectively through the swing arm 9.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lower roller feeding mechanism for a differential feeding flat sewing machine, characterized in that, It includes a rotatable roller shaft (2) and a one-way drive wheel set (3) respectively located below the base (1). The outer periphery of the roller shaft (2) is equipped with a lower roller (4). One end of the one-way drive wheel set (3) is connected to the roller shaft (2) and is used to drive it to rotate synchronously. The other end of the one-way drive wheel set (3) is connected to a connecting rod (5). The other end of the connecting rod (5) is connected to a connecting rod (6). The other end of the connecting rod (6) is equipped with a rotary adjustment component (7). An adjustment shaft (8) is formed at the eccentric part of the rotary adjustment component (7). A swing rod (9) is connected to the outer periphery of the adjustment shaft (8). The swing rod (9) is used to connect to the feeding shaft (10) and can be driven by the feeding shaft (10) to swing back and forth.

2. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 1, characterized in that: A hinge shaft (11) is provided between the first connecting rod (5) and the second connecting rod (6). The other end of the second connecting rod (6) is provided with a mounting hole (12) for installing a rotary adjustment component (7). The outer end of the rotary adjustment component (7) is formed with an adjustment part (13). One end of the swing rod (9) is provided with a mounting hole (14) for installing an adjustment shaft (8).

3. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 2, characterized in that: The adjustment part (13) has an adjustment groove (15) formed on it, and the mounting hole (14) has a fastening hole (16) on its side wall.

4. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 1, characterized in that: The unidirectional transmission wheel set (3) includes a wheel frame (17), a transmission wheel shaft (18) is provided inside the wheel frame (17), and a drive wheel (19) and a unidirectional wheel (20) for driving the drive wheel (19) to rotate in one direction are respectively installed on the outer periphery of the transmission wheel shaft (18).

5. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 4, characterized in that: One end of the tractor shaft (2) is provided with a driven wheel (21), and a transmission belt (22) is connected between the driven wheel (21) and the driving wheel (19).

6. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 1, characterized in that: One end of the connecting rod (5) is formed with a sleeve (23) for mounting on the outer periphery of the one-way wheel (20).

7. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 1, characterized in that: A wheel seat (24) is provided below the base (1), and the wheel seat (24) contains the towing wheel shaft (2). Bearings (25) are provided between the two ends of the towing wheel shaft (2) and the wheel seat (24).

8. The lower roller feeding mechanism of the differential feeding flat sewing machine according to claim 1, characterized in that: The swing arm (9) has an inner mounting cylinder (26) for mounting on the outer periphery of the feed shaft (10), and the other end of the swing arm (9) has a connecting part (27) for connecting to the tooth holder seat (28).

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