Differential feeding mechanism of sewing machine

Abstract

The utility model provides a differential feeding mechanism of a sewing machine, and belongs to the technical field of sewing machines. The problem of how to improve the space utilization rate in the machine shell is solved. According to the differential feeding mechanism of the sewing machine, the sewing machine comprises a machine shell, an adjusting motor and an upper differential feeding tooth, the differential feeding mechanism comprises an adjusting assembly and an upper differential swing assembly used for controlling the upper differential feeding tooth to swing, the adjusting assembly comprises a swing seat, and a hollow mounting seat is arranged on the outer wall of the machine shell; the adjusting motor is fixed outside the mounting base or the machine shell, a driving shaft of the adjusting motor extends into the mounting base, and the adjusting assembly is located in the mounting base and connected with the driving shaft of the adjusting motor and the upper differential swing assembly through a swing base. The differential feeding mechanism of the sewing machine can improve the space utilization rate in the machine shell.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field relates to a differential feeding mechanism of sewing machine. BACKGROUND

[0002] The sewing machine is with one or more sewing line, on the seam material forms one or more line, makes one layer or more seam material interweaves or sews up the machine. When the needle is for the multi-layer seam material carries out the sewing work, adopts the presser foot cooperation upper feeding tooth to carry out the feeding while the upper layer seam material is pressed flat, it is the usual means of preventing the upper and lower layer cloth between the present appearance layer and the wrinkle phenomenon.

[0003] Such as Chinese patent (grant announcement number: CN216193192U) discloses a kind of sewing machine and upper and lower coordinated differential feeding mechanism, including rack, driving motor and upper shaft are set on the rack, driving motor drives upper shaft rotation;Upper differential feeding mechanism, driven by upper shaft and executes feeding action on the upper side of cloth;Lower differential feeding mechanism, driven by upper shaft and executes feeding action on the lower side of cloth;The upper differential feeding mechanism includes upper adjusting assembly, upper adjusting motor, differential feeding shaft and upper feeding tooth assembly;The output shaft of upper adjusting motor is installed with adjusting crank assembly, adjusting crank assembly drives the swing seat of the upper adjusting assembly, swing seat controls the transmission amplitude between upper shaft and differential feeding shaft, differential feeding shaft drives the upper feeding tooth assembly.

[0004] Simply speaking, the upper feeding tooth assembly 9 of the sewing machine is driven by the upper shaft 3 and the differential feeding shaft 8, and is driven by the driving motor 2, so that the upper feeding tooth assembly 9 can normally operate. Before working, the user can pre-adjust the position of the upper feeding tooth assembly 9 by the upper adjusting motor 7 and the differential feeding shaft 8, so as to achieve efficient and convenient adjustment of the initial position of the upper feeding tooth assembly 9.

[0005] However, the internal space of the machine shell (referred to as the rack in the comparison file) is very limited, and the normal operation of the sewing machine requires the cooperation of many components installed inside. The upper adjusting motor itself has a large volume, which will inevitably occupy too much space inside the machine shell (rack), thereby causing great limitations in the installation of many connecting rods, cranks and other components inside the machine shell (rack), and low space utilization. SUMMARY

[0006] The utility model aims at the above-mentioned problems existing in the prior art, and provides a differential feeding mechanism of sewing machine. The technical problem to be solved by the utility model is how to improve the space utilization inside the machine shell.

[0007] The differential feeding mechanism of the sewing machine can be realized by the following technical scheme: a differential feeding mechanism of a sewing machine, the sewing machine comprising a machine shell, an adjusting motor and upper differential feeding teeth, the differential feeding mechanism comprising an adjusting assembly and an upper differential swing assembly for controlling the swing of the upper differential feeding teeth, characterized in that the adjusting assembly comprises a swing seat, the machine shell outer wall is provided with a mounting seat with a hollow interior, the adjusting motor is fixed outside the mounting seat or the machine shell and the driving shaft extends into the mounting seat, and the adjusting assembly is located in the mounting seat and connected with the driving shaft of the adjusting motor and the upper differential swing assembly through the swing seat.

[0008] It should be noted in advance that the method of flattening and feeding the upper layer of fabric by cooperating the presser foot with the upper differential feeding teeth can adopt the prior art, and details can be referred to Chinese Patent CN216193192U. In simple terms, the main motor connected with the upper shaft drives the upper shaft to move the upper feeding tooth assembly, and at the same time, the cam assembly installed on the upper shaft cooperates with the upper differential swing assembly to make the upper differential feeding teeth reciprocate within a preset angle range, thereby flattening and loosening the fabric. Before working, for different fabrics, the user can drive the adjusting assembly through the adjusting motor to make the swing seat in the adjusting assembly swing, thereby controlling the transmission amplitude between the upper shaft and the upper differential swing assembly, so as to pre-adjust the position of the upper differential feeding teeth for different materials. On this basis, the improvement point of the present application is that a mounting seat with a cavity is arranged on the outer wall of the machine shell, the adjusting assembly is placed in the cavity of the mounting seat, the adjusting motor is placed outside the machine shell and fixed with the mounting seat (as an alternative, the adjusting motor can also be installed outside the machine shell), and the driving shaft of the adjusting motor extends into the cavity of the mounting seat and is connected with the adjusting assembly. On the premise that the driving shaft of the adjusting motor can drive the upper differential swing assembly to drive the upper differential feeding teeth to swing through the adjusting assembly, the space that can be left in the machine shell can be larger, avoiding the limitation of the installation of the upper differential swing assembly caused by the existence of the adjusting motor, thereby improving the space utilization in the machine shell. At the same time, during the adjusting process, the adjusting motor only needs to control the adjusting assembly and the upper differential swing assembly to drive the upper differential feeding teeth to swing to a certain angle according to the demand, and then stop the action, thereby avoiding the situation that the stability and reliability of the differential feeding mechanism are reduced due to the continuous action of the adjusting motor.

[0009] In the differential feeding mechanism of the sewing machine, the mounting base is cuboid, the mounting surface is formed on one side of the mounting base, the adjusting motor is fixed on the mounting surface and the end surface of the adjusting motor is attached to the mounting surface, the through shaft hole is formed in the inner wall of the mounting base and the driving shaft of the adjusting motor extends into the mounting base through the through shaft hole. Specifically, the adjusting motor is fixed on the mounting surface outside the mounting base, the driving shaft of the adjusting motor extends into the mounting base through the shaft hole formed in the mounting base under the premise of ensuring the stability of the mounting of the adjusting motor, the driving shaft of the adjusting motor and the upper shaft and the differential feeding shaft in the machine shell are parallel, the adjusting assembly is hinged by the driving shaft of the adjusting motor and the adjusting assembly, so as to control the swinging movement of the upper differential feeding teeth relative to the presser foot.

[0010] In the differential feeding mechanism of the sewing machine, the adjusting assembly further comprises a crank and a connecting rod, the crank is fixed on the driving shaft of the adjusting motor, the swinging seat is hinged in the mounting base, and one end of the connecting rod is hinged with the crank and the other end is hinged with the swinging seat. Specifically, the adjusting assembly is composed of the crank, the swinging seat and the connecting rod, the crank is fixed on the driving shaft of the adjusting motor and is swung by the driving shaft of the adjusting motor, the swinging seat is hinged with the upper differential swinging assembly, and the crank and the swinging seat are hinged by the connecting rod, the force is transmitted by the connecting rod and the swinging seat is swung, so that the upper differential swinging assembly drives the upper differential feeding teeth to complete the swinging movement.

[0011] In the differential feeding mechanism of the sewing machine, the outer side wall of the crank is integrally formed with a hinge part one, the outer side wall of the swinging seat is integrally formed with a hinge part two, one end of the connecting rod is hinged with the hinge part one by a pin or a shaft position screw, and the other end is hinged with the hinge part two by a pin or a shaft position screw. Further, one end of the connecting rod is matched with the hinge part one on the crank by a pin or a shaft position screw, and the other end is matched with the hinge part two on the swinging seat by a pin or a shaft position screw, so as to transmit the force between the driving shaft of the adjusting motor and the upper differential swinging assembly by the adjusting assembly.

[0012] In the differential feeding mechanism of the sewing machine, the swinging seat pins are fixed on the opposite inner walls of the mounting base, the hinge holes are formed in the outer side walls of the swinging seat, and the swinging seat is hinged in the mounting base by the two swinging seat pins and the two hinge holes. The swinging seat pins are arranged in the mounting base, the swinging seat is hinged with the two swinging seat pins through the hinge holes formed in the two side walls of the swinging seat, so that the position of the swinging seat in the mounting base is kept and the swinging seat is limited.

[0013] Compared with the prior art, the differential feeding mechanism of the sewing machine has the following advantages:

[0014] The adjusting assembly composed of the crank, the connecting rod and the swing seat is installed in the mounting seat, the adjusting motor is fixed on the mounting surface outside the mounting seat by screws, and the driving shaft of the adjusting motor extends into the mounting seat and is connected with the crank in the adjusting assembly, so that the adjusting motor is externally arranged, more space in the casing is left for arranging the differential swing assembly, and the space utilization in the casing is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structure diagram of the differential feeding mechanism of the sewing machine.

[0016] Figure 2 is a sectional view and a partial enlarged view of the differential feeding mechanism of the sewing machine.

[0017] Figure 3 is a structure diagram of the differential feeding mechanism of the sewing machine after the casing is removed and a partial enlarged view thereof.

[0018] Figure 4 is a structure diagram of the casing.

[0019] Figure 5 is a structure diagram of the casing from another perspective.

[0020] Figure 6 is a structure diagram of the crank in the adjusting assembly.

[0021] Figure 7 is a structure diagram of the swing seat in the adjusting assembly.

[0022] In the drawings, 1 is the casing; 11 is the mounting seat; 111 is the mounting surface; 1111 is the shaft hole; 112 is the swing seat pin; 2 is the adjusting motor; 3 is the upper differential feeding tooth; 4 is the adjusting assembly; 41 is the crank; 411 is the first hinge part; 42 is the swing seat; 421 is the second hinge part; 422 is the hinge hole; 43 is the connecting rod; and 5 is the upper differential swing assembly. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the present application combined with the drawings, which further describes the technical scheme of the present application, but the present application is not limited to these embodiments.

[0024] As Figures 1-3As shown, the differential feeding mechanism of the sewing machine comprises a machine shell 1, the tail of the machine shell 1 is provided with a main motor, the machine shell 1 is rotatably connected with an upper shaft along the length direction, the upper shaft is fixedly connected with the driving shaft of the main motor, in addition, the machine shell 1 is provided with an upper feeding tooth assembly along the vertical direction near the head, the differential feeding mechanism comprises an upper differential swing assembly 5 connected in the machine shell 1, wherein the upper feeding tooth assembly is provided with a presser foot, the upper differential swing assembly 5 is connected with an upper differential feeding tooth 3.

[0025] In combination Figure 4 With Figure 5 , the outer side wall of the machine shell 1 is integrally formed with a mounting seat 11 which is hollow inside, the mounting seat 11 is specifically in the shape of a cube, one side of the mounting seat 11 towards the tail of the machine shell 1 is an installation surface 111, and the installation surface 111 is provided with a through shaft hole 1111 penetrating the inner wall of the mounting seat 11, an adjusting motor 2 is mounted outside the machine shell 1, specifically, the adjusting motor 2 is fixed on the installation surface 111 by screwing, and the driving shaft of the adjusting motor 2 extends into the cavity in the mounting seat 11 through the through shaft hole 1111, in combination Figure 6 With Figure 7 , the differential feeding mechanism further comprises an adjusting assembly 4 arranged in the mounting seat 11, specifically, the adjusting assembly 4 is composed of a crank one 41, a swing seat 42 and a connecting rod 43, and the upper differential swing assembly 5 comprises a differential feeding shaft which is arranged in parallel with the upper shaft, the differential feeding shaft is fixed with a crank two, the upper shaft is fixed with a cam, and the crank two and the cam are hinged through two oppositely arranged connecting plates.

[0026] The crank one 41 is fixed on the crankshaft of the adjusting motor 2 by screwing, and the outer wall of the crank one 41 has a hinged part one 411 protruding outward, the swing seat 42 is in the shape of U, the swing seat 42 is sleeved outside the two connecting plates and is hinged with the two connecting plates through a hinged shaft, the swing seat 42 is provided with a hinged hole 422 on the outer wall of each side, and a swing seat pin 112 is fixed on the inner side of each side of the mounting seat 11, the swing seat is hinged through the two hinged holes 422 and the swing seat pin 112, in addition, the swing seat 42 has a hinged part two 421 protruding outward, one end of the connecting rod 43 is hinged with the hinged part one 411 through a pin, and the other end is hinged with the hinged part two 421 through a pin.

[0027] It is worth mentioning that the mounting seat 11 can be integrally formed with the machine shell 1, or the two can be manufactured separately and fixed by fastening. In addition to the above structure, the installation surface 111 can also be arranged on the side of the mounting seat 11 towards the head of the machine shell 1, and the adjusting motor 2 is installed on the installation surface 111 and arranged near the head of the machine shell 1, or the adjusting motor 2 is directly installed on the machine shell 1 so that the motor shaft extends into the mounting seat 11 through the through shaft hole 1111.

[0028] Working principle: the upper differential swing assembly 5 in the sewing machine can adopt the prior art, and the specific structure will not be described too much, and the specific working process can be seen in Chinese patent CN216193192U. In short, before working, the user can start the adjusting motor 2, drive the adjusting assembly 4 (i.e. the crank one 41, the connecting rod 43 and the swing seat 42) through the driving shaft of the adjusting motor 2, drive the crank two on the upper differential swing assembly 5 to swing through the swing action of the swing seat 42, make the differential feeding shaft in the upper differential swing assembly 5 rotate a certain amplitude, so as to control the transmission amplitude between the upper shaft and the differential feeding shaft, so as to realize the adaptive adjustment of the position and angle of the upper differential feeding tooth 3 corresponding to different fabrics. After completing this step, the driving shaft of the adjusting motor 2 remains in this state, so that the state of the upper differential feeding tooth 3 is maintained. Then the user starts the main motor, and the upper shaft rotates under the control of the main motor. The upper shaft rotates through the upper differential swing assembly 5 to drive the presser foot and the upper differential feeding tooth 3 to intermittently lift and drop slightly, and the upper shaft controls the upper differential swing assembly 5 to drive the upper differential feeding tooth 3 to swing relative to the presser foot through the cam, so as to realize the flattening and feeding of the upper layer of fabric through the cooperation of the presser foot and the upper differential feeding tooth 3. In the present application, the adjusting assembly 4 is accommodated by the installation seat 11, and the adjusting motor 2 originally built in the cabinet 1 is connected outside the cabinet and the installation seat 11, so that more space can be left in the cabinet 1 for the arrangement of the needle spacing adjusting mechanism and the presser foot lifting mechanism, so as to ensure higher space utilization in the cabinet 1.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0030] Although the terms such as cabinet 1, installation seat 11, installation surface 111, shaft hole 1111, swing seat pin 112, adjusting motor 2, upper differential feeding tooth 3, adjusting assembly 4, crank one 41, hinge part one 411, swing seat 42, hinge part two 421, hinge hole 422, connecting rod 43, upper differential swing assembly 5, etc. are used more frequently herein, but the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A differential feed mechanism of a sewing machine, the sewing machine comprising a machine housing (1), an adjusting motor (2) and an upper differential feed dog (3), the differential feed mechanism comprising an adjusting assembly (4) and an upper differential swing assembly (5) for controlling the swinging of the upper differential feed dog (3), characterized in that, The adjusting assembly (4) comprises a swing seat (42), the outer wall of the casing (1) is provided with a mounting seat (11) with a hollow interior, the adjusting motor (2) is fixed outside the mounting seat (11) or the casing (1) and the driving shaft extends into the mounting seat (11), the adjusting assembly (4) is located in the mounting seat (11) and connects the driving shaft of the adjusting motor (2) and the upper differential swing assembly (5) through the swing seat (42).

2. The differential feed mechanism for a sewing machine according to claim 1, wherein The mounting seat (11) is in a cubic shape, one side of the mounting seat (11) towards the tail of the casing (1) is a mounting surface (111), the adjusting motor (2) is fixed on the mounting surface (111) and the end surface is attached to the mounting surface (111), the mounting surface (111) is provided with a through shaft hole (1111) penetrating the inner wall of the mounting seat (11), the driving shaft of the adjusting motor (2) extends into the mounting seat (11) through the through shaft hole (1111).

3. The differential feed mechanism for a sewing machine according to claim 1 or 2, wherein The adjusting assembly (4) further comprises a crank one (41) and a connecting rod (43), the crank one (41) is fixed on the driving shaft of the adjusting motor (2), the swing seat (42) is hinged in the mounting seat (11), one end of the connecting rod (43) is hinged with the crank one (41) and the other end is hinged with the swing seat (42).

4. The differential feed mechanism for a sewing machine according to claim 3, wherein The outer side wall of the crank one (41) is integrally formed with a hinge part one (411), the outer side wall of the swing seat (42) is integrally formed with a hinge part two (421), one end of the connecting rod (43) is hinged with the hinge part one (411) through a pin or an axle position screw and the other end is hinged with the hinge part two (421) through a pin or an axle position screw.

5. The differential feed mechanism for a sewing machine according to claim 4, wherein The opposite inner walls of the mounting seat (11) are both fixed with swing seat pins (112), the outer walls of the swing seat (42) are both provided with hinge holes (422), the swing seat (42) is hinged in the mounting seat (11) through the cooperation of the two swing seat pins (112) and the two hinge holes (422).

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