CN214572596U - Sewing machine with zero point position - Google Patents

Abstract

The application provides a sewing machine with position at zero point, concretely relates to sewing machine makes technical field, including driving motor and swing seat to and cam and rotation combination wheel, driving motor fixed mounting has the cam, the gauge needle of cam is adjusted the working face and is used for changing the gauge needle regulation working face position of acting on with rotation combination wheel, the rotatory location spout that acts on rotation combination wheel of zero point locating lever that the cam has, the rotation combination wheel indirect action is on the swing seat, and makes the swing seat be in the zero position state. The sewing machine with the zero position realizes that one driving motor flexibly controls the needle pitch adjustment, the thread cutting and the presser foot lifting action, realizes that the feed dog is in the zero position under the control of an electric control system of the sewing machine, has strong creativity of actual products, achieves the sewing action at one go, and has higher popularization and use values.

Description

Sewing machine with zero point position

Technical Field

The application provides a sewing machine with zero position, concretely relates to sewing machine makes technical field.

Background

The sewing machine is provided with a stitch length adjusting mechanism, the stitch length adjusting mechanism is used for adjusting the stitch length of the sewing machine, the stitch length adjusting mechanism is provided with a forward sewing mode and a backward sewing mode which are switched, the central point position between the forward sewing mode and the backward sewing mode is a zero position, and the zero position is the zero position state of the swing seat of the sewing machine. When the needle pitch is adjusted, it is usually performed in a state where the sewing machine is stopped. The old-fashioned sewing machine adjusts by rotating a needle gauge adjusting rod in a needle gauge adjusting mechanism, a needle gauge adjusting stud moves forwards or rightwards while being rotated, and the needle gauge adjusting mechanism drives a zero position of a swinging seat in a feeding mechanism to rotate around a fulcrum of the swinging seat so as to adjust the actual distance of positive needle gauge and negative needle gauge of the swinging seat, so that the swing angle of the swinging seat can be changed, and the corresponding needle gauge adjustment is realized.

When the needle pitch of the sewing machine is zero, the needle of the sewing machine stays below the needle plate to be called a lower needle position, and the needle stays above the needle plate to be called an upper needle position. When the foot-operated sewing machine finishes sewing, the stop position of the sewing machine is determined by the end of sewing stitches. The staying position of the machine needle has certain influence on the subsequent sewing work, and if the machine needle stays at the lower needle position, the hand wheel is rotated to lift the machine needle, so that the problem can be solved; if the feed dog stays at the upper needle position, the reversing hand wheel lowers the feed dog below the needle plate. When the sewing cloth is taken out under the presser foot and the cloth is pushed under the presser foot in the next sewing work under the state that the position where the feed dog stays is higher than the needle plate, the feed dog may hook the cloth, and the cloth is hooked badly.

In the above pushing device solution for pushing the feed dog, an additional driving device is required, which naturally increases the manufacturing cost of the sewing machine. For the pushing device additionally arranged at the bottom of the sewing machine base, the pushing device is inconvenient to be additionally arranged on a cloth feeding shaft or other related parts in the production and assembly process, and the base is messy due to the large occupied space of the pushing device. In addition, this pushing device has the disadvantage that the pushing device implements a preset pushing plan regardless of whether the feed dog is below or above the needle plate, the level of intelligence is relatively low, and energy is wasted.

Disclosure of Invention

The utility model provides a sewing machine with zero position, including driving motor and swing seat, its characterized in that still including cam and rotation combination wheel, driving motor fixed mounting has the cam, the gauge needle of cam is adjusted the working face and is used for changing the gauge needle regulation working face effect position with rotation combination wheel, the zero locating lever rotation that the cam has acts on the location spout that rotates combination wheel, it acts on the swing seat indirectly to rotate combination wheel, and makes the swing seat be in the zero-bit condition.

Preferably, the driving motor is a double-head power output driving motor, the driving motor is connected with a first output shaft and a second output shaft, and the first output shaft is provided with a cam for executing the needle pitch adjusting action of the needle pitch adjusting mechanism and the presser foot lifting action of the presser foot lifting mechanism; the output shaft II is provided with a thread cutting crank to execute thread cutting action of the thread cutting mechanism.

Preferably, the automatic cloth feeding device further comprises a needle pitch adjusting mechanism, the needle pitch adjusting mechanism is provided with a transmission shaft sleeve, the rotating combined wheel is fixedly connected with the transmission shaft sleeve, the transmission shaft sleeve is sleeved on the cloth feeding shaft, the transmission shaft sleeve is in clearance fit with the cloth feeding shaft, the other end of the transmission shaft sleeve is connected with a connecting block, the swinging seat is hinged with a transmission connecting rod, the transmission connecting rod is fixed on the connecting block, and the zero-point positioning rod is adjacent to a positioning surface.

Preferably, the rotating combination wheel and the transmission shaft sleeve are manufactured into a whole, and the rotating combination wheel and the transmission shaft sleeve are sleeved on the cloth feeding shaft as a whole; alternatively, the outdrive and the connecting block are manufactured as one piece.

Preferably, the rotation combination wheel has a first positioning chute and a second positioning chute, and the zero positioning rod freely slides in the first positioning chute and the second positioning chute.

Preferably, the contact action point of the zero positioning rod on the first bell mouth is a work determination point for determining the position of the feed dog, and the position of the feed dog under the needle plate is determined; the contact action point of the zero positioning rod on the horn mouth II is a work determining point for determining the position of the feed dog, the position of the feed dog below the needle plate is determined, and the zero positioning rod retreats from the horn mouth II to the original position.

Preferably, the cam has a shaft hole for fixing the cam on the first output shaft of the driving motor, the shaft hole is located between the needle pitch adjusting working surface and the zero-point positioning rod, the shaft hole, the needle pitch adjusting working surface and the zero-point positioning rod are located on a connecting line of center lines of the three, and the needle pitch adjusting working surface and the zero-point positioning rod rotate around the shaft hole.

Preferably, the positioning chute and the needle pitch adjusting action surface rotate by taking the cloth feeding shaft as a rotating shaft, a central connecting line of the positioning chute and the needle pitch adjusting action surface is collinear with a central line of the cloth feeding shaft, the combined wheel rotates by taking the cloth feeding shaft as the rotating shaft under the action of the cam, after the zero-point positioning rod enters the positioning chute, the movable zero-point positioning rod always forms a fixed positioning for the static positioning chute to the transmission shaft sleeve, and the zero-point positioning rod operates in the positioning chute, so that the cloth feeding tooth is located at a needle-feeding position.

Preferably, the wire cutting mechanism further comprises a wire cutting fork wheel, a wire cutting crank and a wire cutting tail end execution assembly, wherein the wire cutting crank is provided with a wire cutting moving rod, and the wire cutting moving rod is located between a wire cutting action surface and an idle surface of the wire cutting fork wheel.

Preferably, the presser foot lifting mechanism is further included, the cam is provided with a presser foot working surface and a circular surface, the presser foot lifting mechanism comprises a presser foot mandril and a presser foot lifting tail end executing assembly, the presser foot working surface generates a lifting force on the presser foot mandril along with the change of the radian of the cam, and then the presser foot lifting tail end executing assembly executes a presser foot lifting action.

Preferably, the thread releasing mechanism is further provided, and the scheme that the first output shaft of the driving motor is mounted with the cam and the first output shaft is mounted with one of the following solutions: the first output shaft is also provided with a thread loosening mechanism and a presser foot lifting mechanism; the first output shaft is also provided with a thread releasing mechanism.

The needle gauge adjusting mechanism has the advantages that the cam is driven by the driving motor and then drives the rotating combined wheel, so that the needle gauge adjusting working surface and the needle gauge adjusting action surface on the cam execute needle gauge adjusting action; so that the needle pitch adjusting working surface and the needle pitch adjusting action surface on the needle bar perform the needle pitch adjusting action. After the cam is driven by the driving motor, the movable zero positioning rod forms a fixed positioning position for the static positioning chute to the transmission shaft sleeve all the time, so that the positioning of the lower needle position of the feed dog is realized, and the driving motor takes the machine zero positioning rod to idle in the positioning chute to execute other sewing actions.

Drawings

FIG. 1 is a schematic view of a sewing machine having a zero position according to the present application;

FIG. 2 is a schematic view of a feed dog position and feed shaft of a sewing machine having a zero position of the present application;

FIG. 3 is an exploded view of a stitch length adjustment mechanism of a sewing machine having a zero position according to the present application;

FIG. 4 is an enlarged view of a feed dog of a sewing machine having a zero position of the present application;

FIG. 5 is another view of a stitch length adjustment mechanism of a sewing machine having a zero position of the present application;

FIG. 6 is a view of the present application showing a rotary compound wheel of a sewing machine having a zero position;

FIG. 7 is a view of the zero position lever of the sewing machine of the present application with a zero position;

FIG. 8 is a block diagram of a thread trimming mechanism of a sewing machine having a zero position according to the present application.

Reference numerals: the device comprises a stitch length adjusting mechanism 10, a rotating combination wheel 11, a stitch length adjusting action surface 111, a positioning chute 112, a first bell mouth 113, a second bell mouth 144, a positioning surface 115, a cloth feeding shaft 12, a cloth feeding crank 121, a transmission shaft sleeve 13, a swing seat 14, a short swing plate 141, a long swing plate 142, a transmission connecting rod 15, a connecting block 16, a feeding connecting rod 17, a presser foot lifting mechanism 20, a presser foot ejector rod 21, a presser foot end executing component 22, a driving motor 50, a first output shaft 51, a second output shaft 52, a cam 61, a circular surface 62, a stitch length adjusting working surface 63, a zero positioning rod 64, a shaft hole 65, a presser foot working surface 66, a cloth feeding tooth 7, a cloth feeding tooth support 71, a needle plate 8, a thread cutting mechanism 90, a thread cutting fork wheel 91, a thread cutting action surface 911, an idle surface 912, a thread cutting crank 92, a thread cutting rod 921 and a thread cutting end executing component 93.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying fig. 1-7, is provided to enable those skilled in the art to more readily understand the advantages and features of the present application and to thereby more clearly and distinctly define the scope of the present application, which is set forth by way of illustration only and is not intended to be limiting of the present invention.

The application is a sewing machine with a zero point position, which is provided with a needle pitch adjusting mechanism 10, a presser foot lifting mechanism 20, a thread cutting mechanism 90, a driving motor 50 and an electric control system, wherein the driving motor 50 respectively drives the needle pitch adjusting mechanism 10, the presser foot lifting mechanism 20 and the thread cutting mechanism 90 at different time periods to execute respective sewing actions. The driving motor 50 is a double-head power output driving motor, the driving motor 50 is connected with a first output shaft 51 and a second output shaft 52, the first output shaft 51 is provided with a cam 61 for executing the needle pitch adjusting action of the needle pitch adjusting mechanism 10 and the presser foot lifting action of the presser foot lifting mechanism 20; the second output shaft 52 is provided with a thread cutting crank 92 for executing thread cutting action of the thread cutting mechanism 90.

As another scheme, the thread releasing mechanism is further provided. The cam 61 mounted on the first output shaft 51 performs a sewing operation having one of the following: an execution thread loosening mechanism and a presser foot lifting mechanism 20; the thread releasing mechanism is independently executed; the presser foot lifting mechanism 20 is separately implemented.

The cam 61 has a shaft hole 65 for fixing the cam 61 to the first output shaft 51 of the driving motor 50, the shaft hole 65 is located between the needle pitch adjusting operation surface 63 and the zero point positioning lever 64, and the shaft hole 65, the needle pitch adjusting operation surface 63 and the zero point positioning lever 64 are located on a connecting line of center lines of the three. The cam 61 rotates about the first output shaft 51 of the driving motor 50, that is, the needle pitch adjustment operation surface 63 and the zero point positioning rod 64 on the cam 61 rotate about the shaft hole 65, and the zero point positioning rods are adjacent to each other to form a positioning surface.

The rotating combined wheel 11 rotates by taking the cloth feeding shaft 12 as a rotating shaft under the action of the cam 61, the positioning chute 112 and the needle pitch adjusting acting surface 111 naturally rotate by taking the cloth feeding shaft 12 as the rotating shaft, and the central connecting line of the positioning chute 112 and the needle pitch adjusting acting surface 111 is collinear with the central line of the cloth feeding shaft 12.

The sewing machine with the determined zero point position of the feed dog 7 has the advantages that the needle pitch adjustment is realized in the shutdown state of the sewing machine, the electric control device of the sewing machine drives the first output shaft 51 to drive the cam 61 to adjust and rotate the action position of the combined wheel 11 through the driving motor 50, the swing amplitude adjustment of the swing seat 14 is indirectly realized, the needle pitch adjustment is realized, and the sewing machine with the needle pitch adjusted is sewn at the fixed needle pitch; secondly, the electric control device of the sewing machine drives the first output shaft 51 to drive the cam 61 to push the rotating combination wheel 11 through the driving motor 50, so that the swinging seat 14 is indirectly in a zero position state. The zero position of the swing seat 14 is normally represented by the flush position of the short swing plate 141 and the long swing plate 142, and indirectly causes the feed dog 7 to be in the zero position without the forward and backward feed motion.

The stitch length adjusting mechanism 10 comprises a rotary combination wheel 11, a cloth feeding shaft 12, a transmission shaft sleeve 13, a swinging seat 14, a transmission connecting rod 15 and a connecting block 16. The rotating combination wheel 11 is fixedly connected with a transmission shaft sleeve 13, the transmission shaft sleeve 13 is sleeved on the cloth feeding shaft 12 and is provided with a positioning device for assisting in paving, so that the zero point position of the transmission shaft sleeve 13 is stable and reliable, and a clearance fit relationship is formed between the transmission shaft sleeve 13 and the cloth feeding shaft 12. The rotating combination wheel 11 and the driving shaft sleeve 13 rotate at a certain angle by taking the cloth feeding shaft 12 as a rotating shaft. The other end of the driving shaft sleeve 13 is connected with a connecting block 16, the swinging seat 14 is hinged with a driving connecting rod 15, and the driving connecting rod 15 is fixed on the connecting block 16. The connecting block 16 is provided with a plurality of fixing holes, the connecting block 16 and the transmission connecting rod 15 are fixedly connected in a variable mode, different fixing holes are selected to be fixed between the connecting block 16 and the transmission connecting rod 15 according to the requirements of different needle pitches, and the purpose of adjusting the needle pitches can be achieved. As an alternative embodiment, the rotating composite wheel 11 and the driving sleeve 13 are made in one piece, and both are fitted on the feed shaft 12 as a whole; as an alternative embodiment, the outdrive 13 and the connecting piece 16 are made in one piece, making the structure more stable.

The needle pitch adjusting mechanism 10 is driven by the operation of the driving motor 50, the needle pitch adjusting working surface 63 of the cam 61 is matched with the needle pitch adjusting action surface 111 of the rotating combination wheel 11, the action position between the cam 61 and the needle pitch adjusting action surface 111 is changed by the operation of the driving motor 50, the rotating combination wheel 11 rotates the needle pitch adjusting action surface 111, the whole rotating combination wheel 11 and the transmission shaft sleeve 13 together by a certain angle, the rotating transmission shaft sleeve 13 drives the connected connecting block 16, finally the transmission connecting rod 15 changes the swing amplitude of the swing seat 14, the cam 61 indirectly adjusts the swing seat 14, and the needle pitch of the sewing machine is adjusted.

When the sewing machine finishes sewing and needs thread cutting, the cam 61 and the rotating combination wheel 11 have a function of determining the zero point position of the feed dog 7. The zero-point positioning lever 64 of the cam 61 and the positioning chute 112 of the rotation combination wheel 11 are in an operation matching relationship, and the zero-point positioning lever 64 indirectly affects the positioning feed dog 7 by being driven by the driving motor 50, so that the front and rear feed power is lost. After the driving motor 50 drives the cam 61 to drive the zero positioning rod 64 to rotate, the zero positioning rod 64 rotates to first contact with the first bell mouth 113 and continuously enter the positioning chute 112 from the first bell mouth 113, the zero positioning rod 64 pushes the first bell mouth 113 and simultaneously pushes the whole rotating combination wheel 11 and the transmission shaft sleeve 13 to rotate, the connecting block 16 and the transmission connecting rod 15 which are linked with the transmission shaft sleeve 13 push the swinging seat 14, and the positions of the short swinging plate 141 and the long swinging plate 142 of the pushed swinging seat 14 are in a flush state. When the cam 61 enters the zero point positioning rod 64 of the positioning chute 112, the movable zero point positioning rod 64 always forms a fixed positioning for the static positioning chute 112 to the driving sleeve 13, and the feed dog 7 is located at the zero point position of the feed dog 7 when the zero point positioning rod 64 operates in the positioning chute 112.

Although the swing base 14 receives the swing source of the feed link 17 when the spindle motor is operated, the swing base 14 is still driven by the transmission link 15 to reach the feed shaft 12 through the feed crank 121, so that the feed dog support 71 fixed on the feed shaft 12 stops twisting, the feed dog 7 on the feed dog support 71 loses the power of front and rear feed, and the zero point position of the feed dog 7 is determined. The contact action point of the zero positioning rod 64 on the first bell mouth 113 is a work determination point for determining the zero position of the feed dog 7, and the wire shearing and presser foot lifting actions can be executed by determining the zero position of the feed dog 7 under the needle plate 8 and driving the motor 50, so that the technical effect of wire shearing at the zero position is realized.

The inlets at the two ends of the positioning chute 112 are the first bell mouth 113 and the second bell mouth 144, the zero-point positioning rod 64 can freely slide in the positioning chute 112, i.e. freely slide between the first bell mouth 113 and the second bell mouth 144, the zero-point positioning rod 64 operates between the first bell mouth 113 and the second bell mouth 144 of the positioning chute 112, and the positioning function of the zero-point positioning rod 64 entering the positioning chute 112 from the first bell mouth 113 or the second bell mouth 144 is the same.

In the sewing machine after the zero position is positioned, the driving motor 50 performs the presser foot lifting operation on the presser foot lifting mechanism 20 and the thread trimming operation on the thread trimming mechanism 90, and the sewing machine can also perform the thread loosening operation of the thread loosening mechanism. When the zero positioning lever 64 is positioned at the positioning chute 112, the sewing operation or step to be performed by the drive motor 50 next is not limited, and may be actually performed according to the sewing process or the structure of the sewing machine.

The thread trimming action specifically comprises: the second output shaft 52 of the driving motor 50 is provided with a thread trimming mechanism 90, the thread trimming mechanism 90 specifically comprises a thread trimming fork wheel 91, a thread trimming crank 92 and a thread trimming tail end executing component 93, the thread trimming crank 92 is provided with a thread trimming moving rod 921, and the thread trimming moving rod 921 is located between a thread trimming action surface 911 and an idle running surface 912 of the thread trimming fork wheel 91. When the zero-point positioning rod 64 starts to enter the positioning chute 112, the above-mentioned thread cutting operation is immediately started, the driving motor 50 drives the thread cutting moving rod 921 of the thread cutting crank 92 to push the thread cutting acting surface 911 of the thread cutting fork wheel 91, so as to rotate the thread cutting fork wheel 91, and the thread cutting end executing assembly 93 executes thread cutting.

The presser foot lifting mechanism 20 includes: a presser foot ejector rod 21 for lifting the presser foot tail end execution assembly 22. The thread cutting action is almost carried out simultaneously with the presser foot lifting action, and the presser foot lifting action comprises the following specific actions: the cam 61 has a presser foot work surface 66 and a circular surface 62. After sewing is stopped, when the zero point positioning rod 64 starts to enter the positioning chute 112, the zero point positioning rod 64, the presser foot working surface 66 and the circular surface 62 rotate simultaneously, so that the circular surface 62 does not generate thrust to the presser foot mandril 21, and the contact part between the two is only surface friction. The presser foot working surface 66 of the cam 61 generates a lifting force to the presser foot mandril 21 along with the change of the radian of the cam 61, and then the presser foot lifting action is executed by the presser foot lifting tail end executing assembly 22, so that the zero point positioning rod 64 realizes the presser foot lifting action in the positioning chute 112.

In the actual sewing process, the presser foot lifting is required to realize sewing for changing the direction of the stitch, such as right-angle bending of the stitch. After the sewing machine is stopped, the contact action point of the zero point positioning rod 64 on the second bell mouth 144 is the work determination point for determining the zero point position of the feed dog 7, and the work determination point enters the positioning chute 112, at this time, the thread cutting moving rod 921 does not generate thrust on the thread cutting action surface 911, and only contacts and idles on the idle running surface 912. Meanwhile, the presser foot working surface 66 of the cam 61 gradually generates lifting force on the presser foot ejector rod 21, so that the presser foot is successfully lifted, the stitch change sewing of sewing is facilitated, and the zero-point positioning rod 64 retreats to the original zero-point position from the horn mouth II 144 after the presser foot is put down in a stitch change way.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. The utility model provides a sewing machine with zero point position, is including driving motor (50) and swing seat (14), its characterized in that, still including cam (61) and rotation combination wheel (11), driving motor (50) fixed mounting has cam (61), zero point locating lever (64) that cam (61) have are rotatory to be acted on the location spout (112) that rotate combination wheel (11), rotation combination wheel (11) indirect action is on swing seat (14), and make swing seat (14) be in the zero position state.

2. A machine according to claim 1, characterised in that the needle pitch adjustment work surface (63) of the cam (61) is used to change the active position of the needle pitch adjustment active surface (111) of the wheel (11).

3. The sewing machine with the zero point position according to claim 1, characterized by further comprising a needle pitch adjusting mechanism (10), wherein the needle pitch adjusting mechanism (10) is provided with a transmission shaft sleeve (13), the rotating combination wheel (11) is fixedly connected with the transmission shaft sleeve (13), the transmission shaft sleeve (13) is sleeved on the cloth feeding shaft (12), the transmission shaft sleeve (13) is in clearance fit with the cloth feeding shaft (12), the other end of the transmission shaft sleeve (13) is connected with a connecting block (16), the swinging seat (14) is hinged with a transmission connecting rod (15), the transmission connecting rod (15) is fixed on the connecting block (16), and the zero point positioning rod (64) is adjacent to a positioning surface (115).

4. A machine with a zero position according to claim 3, characterized in that said rotating group wheel (11) and driving sleeve (13) are made in a single piece, both of which are fitted as a whole on the feed shaft (12); alternatively, the driving sleeve (13) and the connecting block (16) are manufactured as one piece.

5. The sewing machine with the zero point position according to claim 1, wherein the rotating combination wheel (11) has a first bell mouth (113) and a second bell mouth (144) at two ends of a positioning chute (112), and the zero point positioning rod (64) slides freely at the positioning chute (112).

6. The sewing machine with the zero point position according to claim 1, characterized in that the contact action point of the zero point locating lever (64) to the first bell mouth (113) is an operation determining point for determining the position of the feed dog, and the position of the feed dog is determined under the needle plate (8); the contact action point of the zero positioning rod (64) on the second bell mouth (144) is a work determination point for determining the position of the feed dog (7), the position of the feed dog (7) below the needle plate (8) is determined, and the zero positioning rod (64) retracts to the original position from the second bell mouth (144).

7. The sewing machine with the zero point position according to claim 1, wherein the cam (61) has a shaft hole (65) for fixing the cam (61) to the first output shaft (51) of the driving motor (50), the shaft hole (65) is located between the needle pitch adjusting operating surface (63) and the zero point positioning lever (64), and the shaft hole (65), the needle pitch adjusting operating surface (63) and the zero point positioning lever (64) are located on a connecting line of center lines of the three, and the needle pitch adjusting operating surface (63) and the zero point positioning lever (64) rotate around the shaft hole (65).

8. The sewing machine with the zero point position according to claim 1, characterized in that the positioning chute (112) and the needle distance adjusting action surface (111) rotate around the cloth feeding shaft (12), the central connecting line of the positioning chute (112) and the needle distance adjusting action surface (111) is collinear with the central line of the cloth feeding shaft (12), after the zero point positioning rod (64) enters the positioning chute (112), the movable zero point positioning rod (64) always forms a fixed positioning for the transmission shaft sleeve (13) relative to the stationary positioning chute (112), and the cloth feeding dog (7) is located at the needle-down position when the zero point positioning rod (64) operates in the positioning chute (112).

9. The sewing machine with the zero point position according to claim 1, characterized by further comprising a thread trimming mechanism (90), wherein the thread trimming mechanism (90) specifically comprises a thread trimming fork wheel (91), a thread trimming crank (92) and a thread trimming end executing assembly (93), the thread trimming crank (92) is provided with a thread trimming moving rod (921), and the thread trimming moving rod (921) is located between a thread trimming acting surface (911) and an idle running surface (912) of the thread trimming fork wheel (91).

10. The sewing machine with the zero point position according to claim 1, further comprising a presser foot lifting mechanism (20), wherein the cam (61) has a presser foot working surface (66) and a circular surface (62), the presser foot lifting mechanism (20) comprises a presser foot mandril (21) and a presser foot lifting end actuating assembly (22), the presser foot working surface (66) generates a lifting force to the presser foot mandril (21) along with the change of the radian of the cam (61), and then the presser foot lifting end actuating assembly (22) carries out a presser foot lifting action.

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