CN112779682A - Positioning wheel of sewing machine - Google Patents

Abstract

The application provides a sewing machine with location feed dog stop position, concretely relates to sewing machine makes technical field, its characterized in that, the locating wheel has gauge needle adjustment tank and feed dog constant head tank, gauge needle adjustment tank has return groove one and return groove two respectively with the both ends that feed dog constant head tank is adjacent, return groove one or return groove two are used for the slider to get back to the feed dog constant head tank at the positive gauge needle maximum point of swing seat or burden gauge needle maximum point, positive gauge needle maximum point and burden gauge needle maximum point are located the terminal point of gauge needle adjustment tank. The technical effect that the residual thread is as short as possible after thread trimming is achieved, the stitch length adjustment and the stop position positioning of the feed dog are controlled and realized based on the electric control system of the sewing machine, and the sewing machine has high popularization and use values.

Description

Positioning wheel of sewing machine

Technical Field

The application provides a positioning wheel of sewing machine, concretely relates to sewing machine manufacturing technical field.

Background

The feed dog and the presser foot of the sewing machine are key parts in the sewing and wiring process, the feed dog provides a needle puncture threading and wiring stroke for sewing materials to be sewn, the presser foot is used for pressing the sewing materials to be sewn on the feed dog, and the feed dog and the presser foot are matched to ensure the smoothness of the sewing materials in the moving process, so that the sewing stitches are neat and attractive. When sewing is finished, a sewing machine usually performs thread cutting in an automatic thread cutting mode, and when a movable thread cutting knife and a fixed thread cutting knife are matched for thread cutting, because the stopping positions of cloth feeding teeth at each time of sewing by the existing sewing machine are different from each other, the lengths of the residual threads after thread cutting are different. After the thread trimming movable cutter and the thread trimming fixed cutter are matched to complete thread trimming, if the thread end left on the sewing material is longer, an operator needs to trim the remaining thread again, the workload of the operator is increased, and the sewing quality is improved, so that the remaining thread which is as short as possible is needed to be realized each time. In addition, when the feed dog stays beyond the needle plate surface, an operator needs to adjust a hand wheel to enable the feed dog to sink below the needle plate surface, and operation steps are added for the operator. If the operator does not find the cloth feeding tooth to be too high, the cloth feeding tooth is easy to hook the sewing material to cause damage to the sewing material when sewing is started. In conclusion, the uncertainty of the stop position of the feed dog causes the thread trimming thread end to be too long, the feed dog is easy to catch and the sewing material is damaged.

Disclosure of Invention

The utility model provides a sewing machine's locating wheel to the defect that current sewing machine feed dog stop position technique exists, this application provides a sewing machine's locating wheel, its characterized in that, the locating wheel has gauge needle adjustment tank and feed dog constant head tank, gauge needle adjustment tank has return groove one and return groove two respectively with the adjacent both ends of feed dog constant head tank.

Preferably, the first return groove or the second return groove is used for returning the sliding piece to the feed dog positioning groove at the positive needle pitch maximum point or the negative needle pitch maximum point of the swinging seat. The positive gauge maximum point and the negative gauge maximum point are located at the end points of the gauge adjustment grooves.

Preferably, the sliding piece enters the feed dog positioning groove from the first return groove or the second return groove, and the stop position of the feed dog is positioned when the sliding piece enters the feed dog positioning groove.

Preferably, the feed dog positioning slot has an outer circular wall and an inner circular wall, and the slider slides between the outer circular wall and the inner circular wall.

Preferably, the positioning wheel pushing sliding piece is driven by a driving motor of the sewing machine, the positioning wheel is mounted on an output shaft of the driving motor, and the output shaft and the circular arc of the feed dog positioning groove are located on the same circle.

Preferably, the feed dog positioning groove pushes the slider to indirectly position the feed dog stop position.

Preferably, the sewing machine is further provided with a swinging seat, a connecting rod, a cloth feeding shaft and a cloth feeding crank, the rotating lever is hinged with the connecting rod, the connecting rod is hinged with the swinging seat, the cloth feeding crank is fixed on the cloth feeding shaft and is hinged with the swinging seat, and the cloth feeding shaft is indirectly connected with the cloth feeding teeth.

Preferably, the positioning wheel is driven by the driving motor to push the sliding part to change the action position of the needle pitch adjusting groove of the positioning wheel, and then the original needle pitch of the swinging seat is changed by rotating the lever and the connecting rod.

Preferably, the sewing machine is also provided with a combined wheel, the combined wheel is provided with a shaft hole through which the output shaft can pass for positioning, the combined wheel is provided with three functional wheels, namely a positioning wheel, a presser foot lifting cam and a thread trimming crank wheel, and different functional wheels of the combined wheel complete the needle pitch adjusting action, the positioning feed dog stop position action, the presser foot lifting action and the thread trimming action under the driving of a driving motor in different driving rotating angles.

Preferably, the working fulcrum of the rotating lever is a sliding part, the sliding part is located in the middle of the rotating lever, a lever supporting shaft is hinged to one end of the rotating lever, and the lever supporting shaft is located on the machine body.

The application proposes to be a sewing machine's positioning wheel beneficial effect is: the positioning wheel is driven by the driving motor to push the sliding piece to change the action position of the positioning groove of the positioning wheel, the original needle pitch of the swinging seat is changed by rotating the lever and the connecting rod, and the sewing machine realizes the needle pitch adjusting action in a stop state; after sewing is finished, the driving motor drives the cloth feeding tooth positioning groove of the positioning wheel to push the sliding piece of the rotating lever, the lever hinge connecting rod is rotated, the connecting rod hinge swinging seat is hinged with the cloth feeding crank, the cloth feeding crank is fixed on the cloth feeding shaft and is hinged to the swinging seat, the cloth feeding shaft is indirectly connected with the cloth feeding tooth, the swinging seat does not provide a swinging source of front and back actions for the cloth feeding tooth, the stop position of the cloth feeding tooth is positioned, thread cutting is executed at the stop position of the cloth feeding tooth, and the technical effect that the residual thread after thread cutting is as short as possible is achieved. This application can avoid simultaneously taking place because of the condition that the feed dog exceeds the needle face and injures the seam material, has also improved the gauge needle and has adjusted the intelligent regulation level, and this application gauge needle is adjusted and feed dog stop position location all controls the realization based on sewing machine electrical system, and this sewing machine has higher using value widely.

Drawings

FIG. 1 is a view of a positioning wheel construction of a sewing machine of the present application;

FIG. 2 is a schematic view of a positioning wheel feed dog positioning wheel and stitch length adjustment of a positioning wheel of a sewing machine according to the present application;

FIG. 3 is a schematic view of a looper pitch adjustment and swing mount of a sewing machine according to the present application;

FIG. 4 is a schematic view of a positioning wheel gauge adjustment slot of a sewing machine of the present application;

FIG. 5 is a side view of a positioning wheel assembly of a sewing machine of the present application;

FIG. 6 is a schematic view of a positioning wheel stitch length dial bar of a sewing machine according to the present application;

FIG. 7 is a view of a positioning wheel cutting structure of a sewing machine according to the present application;

FIG. 8 is a schematic view of a positioning wheel pressure foot cam of a sewing machine according to the present application.

Reference numerals: the device comprises a driving motor 10, an output shaft 11, a shaft hole 12, a combination wheel 20, a positioning wheel 21, a needle pitch adjusting groove 211, a feed dog positioning groove 212, an outer circular wall 21b, an inner circular wall 21c, a first return groove 213, a second return groove 214, a maximum positive needle pitch point 215, a maximum negative needle pitch point 216, a pressure raising and pressing foot cam 22, a first pressure raising and pressing foot action surface 221, a second pressure raising and pressing foot action surface 222, a pressure raising and pressing foot peak 223, an idle surface 224, a trimming crank wheel 23, a rotating column 231, a swinging seat 30, a feeding swinging plate 31, a long swinging plate 33, a short feeding swinging plate 32, a rotating lever 41, a sliding part 42, a lever supporting shaft 43, a connecting rod 44, a machine body 45, a feed cloth shaft 51, a feed crank 52, a swinging connecting rod 53, a pressure raising and pressing foot ejector rod 61, a positioning sleeve 62, a pressing foot lever 63, a pressing foot end execution end 64, a trimming fork wheel 71, a fixed shaft 72, a trimming action surface 73, a trimming, a trimming long shaft 76, a spindle motor 81 and a feed dog 91.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 8, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

The application provides a positioning wheel of sewing machine, including driving motor 10, install composite wheel 20 on the output shaft 11 that driving motor 10 has, composite wheel 20 is used for realizing sewing machine's gauge needle adjustment action, location feed dog stop position action, lifts presser foot action and trimming action at different time quantums. The four sewing actions are at each driving corner of the driving motor 10, and the wheels with different functions of the combined wheel 20 are driven by the driving motor 10 in each driving corner to complete the four sewing actions, or complete any one of the four sewing actions, or randomly combine two or more than two sewing actions.

The combination wheel 20 has three functional wheels, namely a positioning wheel 21, a lifting and pressing foot cam 22 and a trimming crank wheel 23, the positioning wheel 21, the lifting and pressing foot cam 22 and the trimming crank wheel 23 are integrally combined into the combination wheel 20, the three functional wheels can be independently arranged and respectively installed and fixed on the output shaft 11, and the lifting and pressing foot cam 22 is positioned between the positioning wheel 21 and the trimming crank wheel 23 regardless of combination or independent arrangement. The combination wheel 20 has a shaft hole 12 through which the output shaft 11 can be inserted and positioned, and the combination wheel 20 is fitted and fixed to the output shaft 11, so that the positioning wheel 21 is attached to the output shaft 11.

The positioning wheel 21 has a needle pitch adjusting groove 211, a feed dog positioning groove 212, a first return groove 213, and a second return groove 214. Two ends of the needle pitch adjusting groove 211 adjacent to the feed dog positioning groove 212 are a first return groove 213 and a second return groove 214 respectively. The needle pitch adjusting groove 211 is correspondingly matched with a rotating lever 41, the working movable fulcrum of the rotating lever 41 is a sliding part 42, the sliding part 42 is positioned in the middle of the rotating lever 41, the sliding part 42 slides and works among the needle pitch adjusting groove 211, the feed dog positioning groove 212, a first return groove 213 and a second return groove 214 according to sewing actions, and the first return groove 213 or the second return groove 214 is used for returning the sliding part 42 to the feed dog positioning groove 212 at a positive needle pitch maximum point 215 or a negative needle pitch maximum point 216 of the swinging seat 30. The maximum point 215 of the positive needle pitch and the maximum point 216 of the negative needle pitch of the swing seat 30 are located at the end points of both ends of the needle pitch adjusting groove 211, and the maximum point 215 of the positive needle pitch and the maximum point 216 of the negative needle pitch are uncertain and can be interchanged due to different models of sewing machines. One end of the rotating lever 41 is sleeved on the lever supporting shaft 43, the lever supporting shaft 43 is positioned on the machine body 45, and the lever supporting shaft 43 plays a role in fixing the rotating shaft by rotating the lever 41. The other end of the rotating lever 41 is hinged with a connecting rod 44, and the other end of the connecting rod 44 is hinged with the swinging seat 30. The needle pitch adjustment is to rotate the positioning wheel 21 by a certain angle by the driving motor 10 to change the action position of the sliding member 42 in the needle pitch adjustment groove 211, that is, the needle pitch adjustment groove 211 pushes the sliding member 42, so as to change the original swing angle of the swing seat 30 by rotating the lever 41 and the connecting rod 44, thereby realizing the needle pitch adjustment. The stitch length adjustment is performed in a state where the sewing machine is stopped, and the stitch length after the adjustment is successful is given to the swing base 30 as a new fixed stitch length.

When the thread cutting is required after the sewing is finished, the sliding member 42 is separated from the stitch length adjusting groove 211 and enters the feed dog positioning groove 212 through the first return groove 213 or the second return groove 214. The feed dog positioning groove 212 is provided with an outer circular wall 21b and an inner circular wall 21c, the sliding piece 42 slides between the outer circular wall 21b and the inner circular wall 21c, when the sliding piece 42 enters the feed dog positioning groove 212, it is determined that the feed dog 91 stays at the middle position of the needle plate hole, namely the stop position of the feed dog 91, and the effect that the sewing material between the feed dog 91 and the presser foot only receives the vertical motion of the feed dog transmitted by the spindle motor 81 and has no front and back feed motion is realized. When the positioning wheel 21 rotates, the sliding member 42 enters the feed dog positioning groove 212 from the needle pitch adjusting groove 211, the sliding member 42 together with the rotating lever 41 pushes the feeding swing plate 31 of the swing base 30 through the connecting rod 44, so that the feeding long swing plate 33 and the feeding short swing plate 32 of the swing base 30 are pushed to be flush, and the feeding long swing plate 33 and the feeding short swing plate 32 in the flush state are driven by the spindle motor 81 to swing the connecting rod 53 to act on the swing angle of the swing base 30 to be zero. The cloth feeding crank 52 is fixed on the cloth feeding shaft 51 and hinged on the swinging seat 30, the cloth feeding shaft 51 is indirectly connected with the cloth feeding teeth 91, when the swinging angle of the swinging seat 30 is zero, the cloth feeding crank 52 connecting the swinging seat 30 and the cloth feeding shaft 51 does not swing, at this time, the swinging seat 30 does not provide a swinging source of the front and back movement for the cloth feeding teeth 91, so that the cloth feeding shaft 51 does not swing, the cloth feeding teeth 91 do not have the front and back cloth feeding movement, the stop position of the cloth feeding teeth 91 of the sewing machine is determined, the invention of the application is realized, the thread cutting movement is executed immediately after the sewing machine is determined according to the main stop position of the cloth feeding teeth 91, and the technical effect that the thread cutting residual thread is as short as possible is realized.

The thread cutting operation is performed after the slider 42 enters the feed dog positioning groove 212 from the first return groove 213 or the second return groove 214 and pushes the feed dog positioning groove 212, that is, the presser foot lifting operation is performed after the stop position of the feed dog 91 is determined, and the presser foot lifting operation is performed after the thread cutting operation is completed.

When the sliding member 42 in the positioning wheel 21 starts to enter the feed dog positioning slot 212 and pushes the connecting rod 44 to indirectly make the feed long swinging plate 33 and the feed short swinging plate 32 flush, the rotating column 231 of the trimming crank wheel 23 applies a pushing force to the trimming acting surface 73 of the trimming fork wheel 71 in the trimming rotating angle of the driving motor 10, and then the trimming acting surface 73 pushes the trimming long shaft 76 and the last trimming executing end executes the trimming action. The thread cutting long shaft 76 is hinged to the thread cutting connecting rod 75 through a passage and penetrates through the whole machine body 45 at the end thread cutting executing end, namely, the thread cutting connecting rod 75 drives the thread cutting long shaft 76 from the thread cutting connecting rod 75 to the end thread cutting executing end 77.

The thread cutting fork wheel 71 is positioned on the fixed shaft 72 by using the fixed shaft 72 as a rotating shaft, and a thread cutting action surface 73 and a thread cutting return action surface 74 of the thread cutting fork wheel 71 are pushed by the rotating column 231 to rotate along with the fixed shaft 72. The thread cutting action surface 73 is hinged to the thread cutting connecting rod 75, the thread cutting action surface 73 is stressed to push the thread cutting connecting rod 75 to press downwards, the thread cutting connecting rod 75 pushes the thread cutting end execution end 76 to execute thread cutting action, and thread cutting under the stop position state of the feed dog 91 is achieved.

The rotating column 231 is located between the trimming acting surface 73 and the trimming returning acting surface 74, the rotating column 231 is located in the idle stroke between the trimming acting surface 73 and the trimming returning acting surface 74, and the positioning wheel 21 is driven by the spindle motor 81 through the swinging connecting rod 53 to idle in the idle stroke during normal sewing, so that the driving motor 10 cannot generate actual action on trimming during normal sewing of the sewing machine of the application, and the rotating column 231 cannot touch the trimming acting surface 73 and the trimming returning acting surface 74 during other actions. The thread cutting return action surface 74 is used for returning the thread cutting fork wheel 71 to the original position of thread cutting after thread cutting, when the rotating column 231 presses the thread cutting action surface 73, that is, the rotating column 231 rotates for one circle, not only thread cutting is performed, but also the integral return of the thread cutting fork wheel 71 is completed.

When the sliding member 42 inside the positioning wheel 21 enters the feed dog positioning slot 212 to complete the thread trimming operation, the sewing machine immediately performs the presser foot lifting operation. The presser foot lifting cam 22 has a first presser foot lifting action surface 221, a second presser foot lifting action surface 222 and an idle surface 224, and a presser foot lifting peak 223 is formed between the first presser foot lifting action surface 221 and the second presser foot lifting action surface 222. During thread trimming, the presser foot lifting push rod 61 abuts against the idle surface 224 of the presser foot lifting cam 22, so that the sewing machine normal sewing and thread trimming operation driving motor 10 does not have an actual operation effect on the presser foot lifting.

The drive motor 10 performs a presser foot raising operation within the presser foot raising corner. The driving motor 10 drives the presser foot lifting cam 22 to lift the presser foot lifting ejector rod 61, and the sliding part 42 can enter from the first return groove 213 or the second return groove 214 and push the feed dog positioning groove 212, so that the presser foot lifting action under the stop position state of the feed dog 91 is realized. The first presser action surface 221 or the second presser action surface 222 of the presser cam 22 can reach the presser peak 223 for the presser lift ram 61, and the presser lift ram 61 can return to the starting position from the first return groove 213 or the second return groove 214. The presser foot lifting ejector rod 61 is sleeved in the positioning sleeve 62, the presser foot lifting ejector rod 61 is hinged with the presser foot lifting lever 63, the presser foot lifting lever 63 is connected with the presser foot lifting end execution end 64, the presser foot lifting action is executed by the presser foot lifting end execution end 64, and the presser foot lifting action at the stop position of the feed dog 91 is realized through the presser foot lifting action, so that the technical value is high.

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 positioning wheel of the sewing machine is characterized in that the positioning wheel (21) is provided with a needle pitch adjusting groove (211) and a feed dog positioning groove (212), and two ends of the needle pitch adjusting groove (211) adjacent to the feed dog positioning groove (212) are respectively provided with a first return groove (213) and a second return groove (214).

2. Positioning wheel for a sewing machine according to claim 1, characterised in that said first return groove (213) or second return groove (214) is provided for the return of the slider (42) to the feed dog positioning groove (212) at a maximum point of positive gauge (215) or maximum point of negative gauge (216) of the oscillating seat (30), said maximum point of positive gauge (215) and maximum point of negative gauge (216) being located at the end points of the gauge adjustment groove (211).

3. The positioning wheel of sewing machine according to claim 2, characterized in that the slider (42) enters the feed dog positioning groove (212) from the first return groove (213) or the second return groove (214), and the positioning of the stop position of the feed dog (91) is realized when the slider (42) enters the feed dog positioning groove (212).

4. Positioning wheel for sewing machines according to claim 3, characterized in that said feed dog positioning slot (212) has an outer circular wall (21b) and an inner circular wall (21c), said slider (42) sliding between the outer circular wall (21b) and the inner circular wall (21 c).

5. The positioning wheel of sewing machine according to claim 1, characterized in that the positioning wheel (21) pushing slider (42) is driven by a driving motor (10) of the sewing machine, an output shaft (11) of the driving motor (10) is provided with the positioning wheel (21), and the output shaft (11) is concentric with the circular arc of the feed dog positioning groove (212).

6. The positioning wheel of sewing machine according to claim 2, characterized in that the feed dog positioning groove (212) pushes the slider (42) to indirectly position the stop position of the feed dog (91).

7. The positioning wheel of sewing machine according to claim 6, characterized in that the sewing machine further comprises a swing seat (30), a connecting rod (44), a cloth feeding shaft (51) and a cloth feeding crank (52), the rotating lever (41) is hinged with the connecting rod (44), the connecting rod (44) is hinged with the swing seat (30), the cloth feeding crank (52) is fixed on the cloth feeding shaft (51) and is hinged with the swing seat (30), and the cloth feeding shaft (51) is indirectly connected with the cloth feeding dog (91).

8. The positioning wheel of sewing machine according to claim 1, characterized in that the positioning wheel (21) is driven by the driving motor (10) to push the sliding member (42) to change the action position of the needle pitch adjusting groove (211) of the positioning wheel (21), and then the original needle pitch of the swing seat (30) is changed by rotating the lever (41) and the connecting rod (44).

9. The positioning wheel of the sewing machine according to claim 1, characterized in that the sewing machine further comprises a combination wheel (20), the combination wheel (20) is provided with a shaft hole (12) for the output shaft (11) to pass through for positioning, the combination wheel (20) is provided with three functional wheels, namely a positioning wheel (21), a presser foot lifting cam (22) and a thread cutting crank wheel (23), and the combination wheel (20) is provided with different functional wheels which complete the needle pitch adjusting action, the positioning feed dog stop position action, the presser foot lifting action and the thread cutting action under the driving of the driving motor (10) in different driving angles.

10. The positioning wheel of sewing machine according to claim 7, characterized in that the working fulcrum of the rotating lever (41) is a sliding member (42), the sliding member (42) is located at the middle of the rotating lever (41), a lever support shaft (43) is hinged at one end of the rotating lever (41), and the lever support shaft (43) is positioned on the machine body (45).

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