Drive clutch for a sewing machine

Abstract

The sewing machine driving clutch device comprises a driving shaft, a passive element, a clutch seat, a driving seat, a power unit and a clutch element. The passive element, the clutch seat and the driving seat are fixed on the driving shaft. The clutch element is arranged on the clutch seat and can be reset. When the clutch element is in the combined position, the clutch seat and the driving seat move together. When the clutch element is in the separated position, the clutch seat and the driving seat do not move together. The driving clutch control is achieved. The driving clutch control is achieved by the clutch element, the passive element, the clutch seat and the driving seat. Therefore, the driving clutch device is simple in design, direct in driving and real-time in operation. The assembly cost and the error in operation are reduced.

Description

TECHNICAL FIELD

[0001] The present invention relates to a sewing machine, in particular to a driving clutch device of a sewing machine. BACKGROUND

[0002] The conventional sewing machine is driven by a power unit to drive a catch shaft and related loop thread hooking mechanism to move a needle bar reciprocally between upper and lower dead points. Another fabric feeding unit is also driven to move reciprocally with the needle bar. The loop thread hooking and fabric feeding units are driven by the needle bar reciprocally moving between the upper and lower dead points. The sewing machine can perform sewing operations such as flat seaming, hemming, decorating, and splicing.

[0003] The sewing machine can control the driving state or non-driving state of the power unit and the catch shaft. However, the conventional driving and clutch device has a complicated structure and a large number of components. The assembly is time-consuming and labor-intensive, and the cost is high. The driving error is caused by the large number of transmission components. The loop thread hooking and needle bar reciprocally moving between the upper and lower dead points are prone to errors, which causes unnecessary sewing errors. SUMMARY

[0004] The present invention relates to a driving clutch device of a sewing machine, which reduces the assembly cost and driving error.

[0005] To solve the above-mentioned problems, the present invention provides a driving clutch device of a sewing machine, which includes a catch shaft, a driven member fixed to the catch shaft, a clutch seat fixed to the catch shaft and having a through hole, a catch seat pivotally connected to the catch shaft and having a clutch hole, a power unit including a power rod and a driving member connected to the power rod, the driving member being pivotally connected to the catch seat, the power rod driving the driving member to drive the catch seat to pivotally rotate around the catch shaft, and a clutch member being resettable and arranged in the clutch seat and being actuable between a combined position and a separated position, the clutch member having a clutch rod portion, the clutch rod portion being normally arranged in the through hole of the clutch seat, when the clutch member is in the combined position, the clutch rod portion is inserted in the through hole of the clutch seat and the clutch hole of the catch seat, so that the catch seat and the clutch seat are driven synchronously and drive the driven member through the catch shaft, when the clutch member is in the separated position, the clutch rod portion is inserted in the through hole of the clutch seat and is separated from the clutch hole of the catch seat, so that the catch seat is not driven synchronously with the driven member and the clutch seat.

[0006] The present application has the effect that: by setting a passive element, a clutch seat and a pivot seat on the actuating shaft, and by setting a clutch element capable of resetting on the clutch seat, when the clutch element is in the combined position, the clutch seat and the actuating seat move together, and when the clutch element is in the separated position, the clutch seat and the actuating seat do not move together, thereby achieving the control of the driving clutch. Since the present application achieves the control of the driving clutch only by the clutch element, the passive element, the clutch seat and the actuating seat, the driving clutch device is simple in design, the driving is more direct and real-time, thereby reducing the purpose of assembly cost and reducing the error in action cooperation.

[0007] Preferably, the clutch element also has a controlled part, and the driving clutch device of the sewing machine further comprises a clutch linkage and a clutch actuator. The clutch linkage has a first pivot fixed part, a guide long slot and a top part for pushing the clutch element from the combined position to the separated position. The clutch actuator has a second pivot fixed part, a pulling part for pulling and an actuating convex part inserted into the guide long slot and guided by each other. The clutch actuator can pivot around the second pivot fixed part between a first position and a second position. When the pulling part is pulled to the first position, the top part corresponds to the controlled part of the clutch element, so that the clutch element remains in the combined position. When the pulling part is pulled to the second position, the actuating convex part pushes against the guide long slot wall surface, so that the top part pushes against the controlled part of the clutch element, and the clutch element is displaced from the combined position to the separated position.

[0008] Preferably, the clutch element also has a controlled part, and the driving clutch device of the sewing machine further comprises a clutch linkage and a clutch actuator. The clutch linkage has a first pivot fixed part, a guide long slot and a top part for pushing the clutch element from the combined position to the separated position. The clutch actuator has a second pivot fixed part, a pulling part for pulling and an actuating convex part inserted into the guide long slot and guided by each other. The clutch actuator can pivot around the second pivot fixed part between a first position and a second position. When the pulling part is pulled to the first position, the top part corresponds to the controlled part of the clutch element, so that the clutch element remains in the combined position. When the pulling part is pulled to the second position, the actuating convex part pushes against the guide long slot wall surface, so that the top part pushes against the controlled part of the clutch element, and the clutch element is displaced from the combined position to the separated position.

[0009] Preferably, the power rod is a self-rotating shaft.

[0010] Preferably, an eccentric wheel is provided on the power rod, which drives the driving element to make the actuating seat pivot around the actuating shaft.

[0011] Preferably, the driving element is connected to the actuating seat by a universal joint.

[0012] Preferably, the clutch seat further has a limiting slot, and the driving clutch device of the sewing machine further comprises a limiting rod, which is fixed to the clutch member and has a limiting rod portion capable of being inserted into the limiting slot along with the clutch member.

[0013] Preferably, a return spring is further included, which has a first spring end portion arranged at the clutch seat and a second spring end portion arranged at the actuating seat, so that the clutch member can be automatically returned to the combined position from the separated position.

[0014] Preferably, the passive member is in an integral structure with the clutch seat. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a state of the present application arranged on a machine seat;

[0016] Figure 2 is a partial exploded view of an embodiment of the present application, showing a passive member, a clutch seat, a clutch member and an actuating shaft in a separated state;

[0017] Figure 3 is a perspective view of an embodiment of the present application;

[0018] Figure 4 is a partial top view of an embodiment of the present application;

[0019] Figure 5 is a partial bottom view of an embodiment of the present application;

[0020] Figure 6 is Figure 3 a sectional view of line segment 6-6, showing the clutch member in a combined position;

[0021] Figure 7 is an actuating view of an embodiment of the present application, showing a state of actuation of a power unit;

[0022] Figure 8 is an actuating view of an embodiment of the present application, showing the clutch member in a separated position;

[0023] Figure 9 is Figure 8 a top view of

[0024] Figure 10 is Figure 8 a bottom view of

[0025] Figure 11 is Figure 8 a sectional view of line segment 11-11, showing the clutch member in a separated position; and

[0026] Figure 12is the top view of another embodiment of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 11 … body

[0029] 12 … fixed piece group

[0030] 20 … catch shaft

[0031] 21 … bearing

[0032] 30 … passive element

[0033] 31 … passive fixed part

[0034] 32 … passive connection part

[0035] 40 … clutch seat

[0036] 41 … perforation

[0037] 42 … limiting groove

[0038] 50 … catch seat

[0039] 51 … clutch hole

[0040] 52 … universal rod

[0041] 60 … power unit

[0042] 61 … power rod

[0043] 62 … active element

[0044] 621 … first set part

[0045] 622 … second set part

[0046] 63 … bearing

[0047] 64 … eccentric wheel

[0048] 65 … universal joint

[0049] 70 … clutch element

[0050] 71 … clutch rod part

[0051] 72 … controlled part

[0052] 80 … limiting rod

[0053] 81 … limiting rod part

[0054] 91 … clutch linkage

[0055] 911 … first pivot fixed part

[0056] 912 … guide long slot

[0057] 913…Top Control Department

[0058] 914…Actuating convex part

[0059] 92… Separation from the cooperating action

[0060] 921…Second pivot fixing part

[0061] 922…Lever section

[0062] 923…Actuating convex part

[0063] 924…Guiding slot

[0064] 95…Return spring

[0065] 951…First spring end

[0066] 952…The end of the second spring. Detailed Implementation

[0067] Please see Figures 1 to 6 As shown, the sewing machine drive clutch device provided in this embodiment of the invention is suitable for mounting on a machine body 11, which has a fixed plate assembly 12. The sewing machine drive clutch device consists of a brake shaft 20, a driven component 30, a clutch seat 40, a brake seat 50, a power unit 60, a clutch component 70, a limit rod 80, a clutch linkage component 91, and a clutch engagement component 92, wherein:

[0068] The brake shaft 20 is pivotally mounted on the body 11 at both ends via bearings 21.

[0069] The passive component 30 has a passive fixing part 31 fixed to the actuation shaft 20 and a passive connecting part 32 opposite to the passive fixing part 31. The passive connecting part 32 can be connected to a hook arm with a ring hook (not shown in the figure), but is not limited thereto, and can be connected to other components of the sewing machine that need to be controlled.

[0070] The clutch seat 40 is fixed to the brake shaft 20 and has a through hole 41 and a limiting groove 42 arranged parallel to the axial direction of the brake shaft 20. In another embodiment, the clutch seat 40 and the driven member 30 are integrally structured, thereby further reducing parts and assembly costs.

[0071] The brake seat 50 is pivotally mounted on the brake shaft 20 and has a clutch hole 51 arranged parallel to the axial direction of the brake shaft 20. The clutch hole 51 can correspond to the through hole 41 of the clutch seat 40. In this embodiment, the brake seat 50 is further provided with a universal joint 52.

[0072] The power unit 60 includes a power rod 61 and a driving member 62 connected to the power rod 61. The driving member 62 is pivotally connected to the brake seat 50. The power rod 61 drives the driving member 62 to actuate, thereby causing the brake seat 50 to reciprocate axially around the brake shaft 20. In this embodiment, the two ends of the power rod 61 are pivotally mounted on the body 11 via bearings 63. The power rod 61 is a rotatable shaft and is provided with an eccentric wheel 64. The driving member 62 has a first fitting 621 fitted onto the eccentric wheel 64 and a second fitting 622 provided with a universal joint 65 that can pivot at multiple angles. The universal joint 65 is connected to the universal joint 52 of the brake seat 50, thereby achieving the effect that the power rod 61 drives the driving member 62 to actuate, thereby causing the brake seat 50 to reciprocate axially around the brake shaft 20. Figure 3 As shown, the power lever 61 drives the driving member 62 to the bottom dead center position, causing the brake seat 50 and the universal joint 52 mounted on it to pivot downwards, as shown. Figure 7 As shown, the power lever 61 drives the driving member 62 to the position of the top dead center, causing the brake seat 50 and the universal joint 52 mounted on it to pivot upwards.

[0073] The clutch element 70 is repositionably disposed on the clutch seat 40 and is capable of being in an engaged position (e.g., Figure 3 and Figure 6 (as shown) and a separation position (as shown) Figure 8 and Figure 11 The clutch 70 operates between (as shown) and has a clutch lever 71 and a controlled part 72. In this embodiment, the clutch lever 71 is a lever, but it is not limited to this and can be integrally formed. The clutch lever 71 is normally inserted through the through hole 41 of the clutch seat 40. When the clutch 70 is in the engaged position (as shown) Figure 3 and Figure 6 As shown), the clutch lever 71 is simultaneously inserted into the through hole 41 of the clutch seat 40 and the clutch hole 51 of the brake seat 50, so that the brake seat 50, the driven member 20, and the clutch seat 40 move together through direct transmission via the brake shaft 20. When the clutch member 70 is in the disengaged position (e.g. Figure 8 and Figure 11As shown, the clutch lever 71 is inserted into the through hole 41 of the clutch seat 40 and disengaged from the clutch hole 51 of the brake seat 50, so that the brake seat 50 does not move with the driven member 30 and the clutch seat 40, and the brake shaft 20 is not driven; the controlled part 72 is arranged in a direction that extends along the axial direction perpendicular to the brake shaft 20 and is located between the driven member 30 and the clutch seat 40; in addition, in this embodiment, the clutch member 70 can be reset on the clutch seat 40 by a reset spring 95. The reset spring 95 is a tension spring and has a first spring end 951 provided on the clutch seat 40 and a second spring end 952 provided on the brake seat 50, so that the clutch member 70 can automatically reset to the engaged position when in the disengaged position, and at the same time keep the clutch member 70 in the engaged position in the normal state.

[0074] The limiting rod 80 is axially fixed to the clutch 70 parallel to the brake shaft 20, and has a limiting rod portion 81 that can be inserted into the limiting groove 42 as the clutch 70 moves. When the clutch 70 is in the engaged position and the disengaged position, the limiting rod 80 is kept inserted into the limiting groove 42 of the clutch seat 40. By the design of the clutch rod portion 81 being inserted into the through hole 41 of the clutch seat 40 and the limiting rod 80 being inserted into the limiting groove 42 of the clutch seat 40, the clutch 70 will not rotate relative to the clutch seat 40.

[0075] The clutch linkage 91 has a first pivot fixing part 911 pivotally mounted on the fixing plate group 12 of the body 11, a guide groove 912, and a control part 72 for pushing the clutch 70 and displacing the clutch 70 from the engaged position to the disengaged position.

[0076] The clutch actuator 92 has a second pivoting fixing part 921 pivotally mounted on the fixing plate assembly 12 of the body 11, a levering part 922 for levering, and an actuating protrusion 923 inserted into the guide slot 912 of the clutch linkage 91. The clutch actuator 92 and the clutch linkage 91 are arranged perpendicularly, and the clutch actuator 92 can be in a first position (e.g., with the second pivoting fixing part 921 as the axis) about the second pivoting fixing part 921. Figure 4 (as shown) and a second position ( Figure 9The clutch linkage 91 pivots between the clutch linkage 91 and the clutch 70. When the lever 922 is moved to the first position, the top part 913 of the clutch linkage 91 aligns with the controlled part 72 of the clutch 70. When the lever 922 is moved to the second position, the actuating protrusion 923 pushes against the groove wall of the guide groove 912, causing the clutch linkage 91 to pivot about the first pivot fixing part 911 as the axis. This causes the top part 913 of the clutch linkage 91 to push against the controlled part 72 of the clutch 70, and causes the clutch 70 to move from the engaged position to the disengaged position. However, the relative positions of the clutch linkage 91 and the clutch linkage 922 change depending on the engagement state of the guide groove 912 and the actuating protrusion 923, and are within an equal range.

[0077] The above describes the configuration of the main components in the embodiments of the present invention. The operation and effects of the present invention are explained below:

[0078] Status 1, See Reference Figure 3 , Figure 5 and Figure 6 As shown, when the drive clutch device of the sewing machine of the present invention is engaged, the clutch member 70, by means of the tension of the return spring 95, causes the clutch seat 40 and the brake seat 50 to be integrated into one unit and move in tandem. That is, the clutch rod 71 of the clutch member 70 is simultaneously inserted into the through hole 41 of the clutch seat 40 and the clutch hole 51 of the brake seat 50. At this time, the power rod 61 of the power unit 60 is activated, which can synchronously drive the brake seat 50 and the clutch seat 40 to move in tandem through the driving member 62. Furthermore, since the clutch seat 40 and the driven member 30 are simultaneously fixed on the brake shaft 20, the driven member 30 moves in tandem with the swing of the clutch seat 40, thereby causing the driven member 30 to actuate the component to be driven, such as the hook arm and ring hook of the sewing machine.

[0079] Status 2, See also Figure 8 , Figure 10 and Figure 11 As shown, when the drive clutch device of the sewing machine of the present invention is in the disengaged state, the actuating part 922 of the clutch actuator 92 is moved from the first position (e.g., Figure 4 (As shown) Move to the second position (as shown) Figure 9 When (as shown), the actuating protrusion 923 of the clutch actuator 92 pushes against the groove wall of the guide slot 912 of the clutch linkage 91, causing the clutch linkage 92 to pivot about the second pivot fixing part 921 as the axis, thereby causing the top restraining part 913 of the clutch linkage 91 to push against the controlled part 72 of the clutch 70, and causing the clutch 70 to move from the engaged position (as shown) Figure 3 and Figure 6 Displaced to the separation position (as shown) Figure 8 and Figure 11As shown), the clutch 70 is displaced a distance toward the driven member 30. Therefore, the clutch lever 71 of the clutch 70 is inserted into the through hole 41 of the clutch seat 40 and disengaged from the clutch hole 51 of the brake seat 50, so that the brake seat 50 and the clutch seat 40 do not move. That is, the clutch seat 40 and the brake shaft 20 remain stationary. Furthermore, since the clutch seat 40 and the driven member 30 are fixed on the brake shaft 20 at the same time, the brake seat 50 will also not move with the driven member 30, thereby preventing the driven member 30 from driving the component it wants to drive.

[0080] It is worth mentioning that when the lever part 922 of the cooperating actuator 92 is moved from the first position (such as...) Figure 4 (As shown) Move to the second position (as shown) Figure 9 As shown), when the clutch lever 71 of the clutch 70 disengages from the clutch hole 51 of the brake seat 50, the clutch 70, which has shifted a distance in the direction of the driven member 30, stretches the return spring 95 and accumulates an elastic restoring force. When the lever part 922 of the clutch actuator 92 loses its levering force, the clutch 70 can automatically return from the disengaged position to the engaged position. Thus, the clutch actuator 92 can automatically return from the second position to the first position, waiting for the next levering operation.

[0081] Accordingly, by fixing a driven member 30, a clutch seat 40, and a brake seat 50 on the brake shaft 20, and by using a clutch member 70 that can be reset on the clutch seat 40, the clutch seat 40 and the brake seat 50 move together when the clutch member 70 is in the engaged position, and the clutch seat 40 and the brake seat 50 do not move when the clutch member 70 is in the disengaged position, thereby achieving control of the drive clutch. Since the control of the drive clutch can be achieved by using the clutch member 70 in combination with the driven member 30, the clutch seat 40, and the brake seat 50, the design of the drive clutch device is simpler, and the drive is more direct and real-time, thereby reducing assembly costs and reducing errors in action coordination.

[0082] Additionally, see Figure 12 As shown, another embodiment of the present invention is presented, which differs from the embodiments described above in that:

[0083] The clutch actuator 92 is provided with a guide slot 924, and the clutch linkage 91 is provided with an actuating protrusion 914 inserted in the guide slot 924. That is, the guide slot and the actuating protrusion are arranged in the opposite direction to those in the above embodiment. Similarly, the clutch 70 can be controlled to move from the engaged position to the disengaged position to achieve another implementation state.

[0084] In summary, the above embodiments and figures are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention should fall within the scope of the present invention.

Claims

1. A drive clutch device for a sewing machine, characterized in that, Include: One brake shaft; A passive component is fixedly mounted on the brake shaft; A clutch seat is fixed to the brake shaft and has a through hole; A brake seat is pivotally mounted on the brake shaft and has a clutch hole; A power unit includes a power rod and a drive member connected to the power rod. The drive member is pivotally connected to the brake seat. The power rod drives the drive member to actuate, thereby causing the brake seat to reciprocate pivoting about the brake shaft. as well as A clutch component is repositioned in a clutch seat and can operate between an engaged position and a disengaged position. The clutch component has a clutch lever portion that normally passes through a through hole in the clutch seat. When the clutch component is in the engaged position, the clutch lever portion is simultaneously inserted into both the through hole in the clutch seat and the clutch hole in the brake seat, causing the brake seat and the clutch seat to move together and drive the driven component through the brake shaft. When the clutch component is in the disengaged position, the clutch lever portion is inserted into the through hole in the clutch seat and disengaged from the clutch hole in the brake seat, causing the brake seat, the driven component, and the clutch seat to not move.

2. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The clutch also has a controlled portion. The sewing machine's drive clutch device further includes a clutch linkage and a clutch engagement member. The clutch linkage has a first pivoting fixed portion, a guide groove, and a top restraint portion for pushing the clutch from the engaged position to the disengaged position. The clutch engagement member has a second pivoting fixed portion, a levering portion for levering, and an actuating protrusion inserted into the guide groove and guiding each other. The clutch engagement member can pivot between a first position and a second position with the second pivoting fixed portion as its axis. When the levering portion is levered to the first position, the top restraint portion aligns with the controlled portion of the clutch, keeping the clutch in the engaged position. When the levering portion is levered to the second position, the actuating protrusion pushes against the wall of the guide groove, causing the top restraint portion to push against the controlled portion of the clutch, and displacing the clutch from the engaged position to the disengaged position.

3. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The clutch also has a controlled portion. The drive clutch device of the sewing machine further includes a clutch linkage and a clutch engagement member. The clutch linkage has a first pivoting fixed portion, an actuating protrusion, and a top restraint portion for pushing the clutch from the engaged position to the disengaged position. The clutch engagement member has a second pivoting fixed portion, an actuating portion for being turned, and a guide groove for the actuating protrusion to be inserted into and guided to each other. The clutch engagement member can pivot between a first position and a second position with the second pivoting fixed portion as the axis. When the actuating portion is turned to the first position, the top restraint portion aligns with the controlled portion of the clutch, keeping the clutch in the engaged position. When the actuating portion is turned to the second position, the groove wall of the guide groove pushes against the actuating protrusion, causing the top restraint portion to push against the controlled portion of the clutch, and displacing the clutch from the engaged position to the disengaged position.

4. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The power rod is a self-rotating shaft.

5. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The power rod is equipped with an eccentric wheel, which drives the driving component to make the brake seat reciprocate around the brake shaft.

6. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The active component is connected to the brake seat via a universal joint.

7. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The clutch seat also has a limiting groove, and the sewing machine's drive clutch device also includes a limiting rod, which is fixed to the clutch member and has a limiting rod portion that can move with the clutch member and remain inserted in the limiting groove.

8. The drive clutch device of the sewing machine as described in claim 1, characterized in that, It also includes a return spring having a first spring end provided on the clutch seat and a second spring end provided on the brake seat, so that the clutch can automatically return to the engaged position when it is in the disengaged position.

9. The drive clutch device of the sewing machine as described in claim 1, characterized in that, The passive component and the clutch seat are integrated into one structure.

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