WO2010113314A1

WO2010113314A1 - Presser member for sewing machine

Info

Publication number: WO2010113314A1
Application number: PCT/JP2009/056944
Authority: WO
Inventors: 昌芳小島
Original assignee: Ykk株式会社
Priority date: 2009-04-03
Filing date: 2009-04-03
Publication date: 2010-10-07
Also published as: TW201037116A

Abstract

Disclosed is a presser member for a sewing machine such as a vertical feed sewing machine or a general feed sewing machine. In a machine foot (40) or an outer retainer (16, 116) for use in a sewing machine, a level difference presser part (41H, 116H) consisting of vertical steps is formed at the end on the back side for introducing a sewn material (6), whereby the machine foot (40) or the outer retainer (16, 116) can easily rides on a stitch material (9) in which steps (T) are formed and sewing can be continued while riding over the steps (T) of the stitch material (9) stepwise. Consequently, continuous sewing can be carried out without requiring any special re-arrangement in both cases of sewing the substantially flat sewn material (6) and stitching a stitch material (9) in which the steps (T) are formed.

Description

Sewing press

The present invention uses a top feed device provided on the upper surface side of the needle plate of the sewing machine and a lower feed tooth provided on the lower surface side, and a vertical feed sewing machine that performs sewing while performing intermittent feed while sandwiching a workpiece from above and below, Alternatively, the present invention relates to a sewing foot or an outer presser pressing member applied to a general feed sewing machine.

When sewing a slide fastener (sewn product) onto a fabric (sewn product), the slide fastener tape and the fabric are overlapped on top and bottom, and the overlapped slide fastener and fabric are pressed from above using the sewing machine foot. Keep it. Then, after piercing the sewing needle carrying the sewing thread (sewing needle), the lower thread is entwined, the sewing needle is pulled up, the sewing needle and the fabric are relatively intermittently fed using the feed mechanism, and sewing is performed sequentially. Go.

Conventionally, a sewing machine for sewing uses a machine foot having a shape shown in, for example, Japanese Utility Model Publication No. 50-47662 (Patent Document 1). A sewing machine foot (described as a cloth presser for a sewing machine in Patent Document 1) is used to lower a sewing machine needle when it is pierced through a sewing product, and uses a back surface pressing portion on the back surface of the sewing machine foot. Thus, the seam around the sewing needle is pressed from above to stabilize the seam.

In addition, an introduction slope in which the back surface pressing portion gently warps upward is formed on the back side end portion of the sewing product at the lower side of the sewing machine foot described in Patent Document 1, During forward sewing and backward sewing, it is easy to ride on the level difference of the sewing object.

The sewing machine foot described in Patent Document 1 is configured such that the back surface pressing portion swings up and down with respect to the sewing direction in order to make it easier to ride on the step of the sewing product (Patent Document). 1 (see FIG. 4).

Japanese Utility Model Publication No. 50-47662

For example, when sewing fabric fabric lined with sponges or thick sewing products such as leather, such as automobile seats, sewing machine foot, outer presser foot, and lower feed dog are combined. A vertical feed sewing machine or a general feed sewing machine that feeds the fabric by movement is used.

In these sewing machines, sewing is performed by intermittently feeding the work to be sewn from both the upper and lower parts. As a result, it is possible to perform sewing by overcoming a slight level difference that occurs when sewing a rail fastener, a bead, or the like as well as a thick fabric. In order to secure the tightness of the thread after sewing or to stabilize the seam uniformly, it is considered preferable that the operating stroke of the sewing foot or the outer presser that moves up and down during sewing is not so large.

Recently, a slide fastener is used for closing an opening of a seat cover such as a fabric or leather covering the surface of an automobile seat. Further, the number of vehicles in which side airbags, actuators, heaters for heating, auxiliary machines, and the like are mounted inside automobile seats is increasing. By using a slide fastener for closing the seat cover of such a vehicle, the opening and closing work when maintaining and inspecting various auxiliary devices arranged inside the automobile seat is facilitated.

In addition, seat springs and cushioning materials are arranged inside the automobile seat, and the seat cover always applies tension to the seat cover by pressing these elastic members, so that the surface has wrinkles. It does not occur.

Thus, a large tension is always applied to the seat cover. Therefore, when a slide fastener is used for closing the opening of the seat cover, it is necessary to use a slide fastener that can withstand a force that pulls the closed slide fastener in the width direction (hereinafter referred to as a lateral pulling force). A slide fastener that can withstand a strong lateral pulling force is inevitably large in size, and it is necessary to use a tooth that has a large thickness.

In the latter part of the process of sewing the seat cover, it may be convenient to sew in the form that crosses the dentition of the slide fastener in the closed state. However, if the thickness of the dentition row of the slide fastener is thick, the sewing foot or the outer presser cannot ride on the dentition row, and the work to be sewn stays in the same place, and continuous sewing is performed. There is a problem that it is not possible to perform.

The movement of the sewing machine foot at the time of sewing that crosses the dentition of the slide fastener using the conventional sewing machine foot will be described with reference to FIG. 17 (1) to 17 (3), the opposing edges of the pair of left and right fastener tapes 8 are bent upward in a U shape, and the 9 tooth rows are symmetrically faced at the tip. The cross section of the width direction of the slide fastener lined up in the front and back direction of the paper surface is shown.

17 (1) to 17 (3) show a state in which the sewing machine foot 940 of the vertical feed sewing machine or the general feed sewing machine is moving up and down in order to perform the sewing crossing the 9 rows of the engagement teeth. It is represented. In FIGS. 17 (1) to 17 (3), the sewing needle in the vertical feed sewing machine or the general feed sewing machine, the outer presser for pressing the sewing product from above, and the upper and lower parts of the sewing product are pressed during sewing. However, descriptions of the upper feed mechanism and the lower feed mechanism that perform intermittent feeding are omitted.

FIG. 17 (1) shows that when the sewing machine foot 940 is intermittently moved to the left side relative to the fabric 6 (sewing object) at the sewing pitch Wp while traversing the service gear 9 row (sewing object) during sewing. The back surface pressing part of the sewing machine foot 940 presses the cloth 6, and the introduction slope 941 I of the sewing machine foot 940 is in contact with the service tooth 9. In this state, the sewing needle (not shown) is lowered, the sewing needle is inserted into the fabric 6, and the lower thread entangled with the lowered sewing needle is lifted and raised. In this state, the position of the end portion on the sewing machine foot 940 side of the service tooth 9 is defined as E0, and the attachment center line for attaching the sewing machine foot 940 to the sewing machine side intermediate presser bar (not shown) is defined as F0. .

17 (2), the sewing machine foot 940 is lifted by the foot lift amount Sp from the state shown in FIG. 17 (1), and is intermittently moved to the left side by the sewing pitch Wp relative to the fabric 6. It is a figure which shows the state which moved the attachment centerline of this to F1. At this time, the introduction slope 941I of the sewing machine foot 940 is in contact with the R chamfered portion formed between the top of the engagement tooth 9 and the end E0. When the sewing machine foot 940 is lowered from this state, the state transitions to a state shown in FIG.

FIG. 17 (3) is a diagram showing a state where the sewing machine foot 940 is lowered from the state shown in FIG. 17 (2) and the fabric 6 is pressed using the back surface pressing portion of the sewing machine foot 940. When the sewing machine foot 940 is to be lowered from the state shown in FIG. 17B, the service tooth 9 escapes to the left along the introduction slope 941I of the sewing machine foot 940. The state shown in FIG. 17 (3) is the same as the state shown in FIG. 17 (1). In this state, the sewing needle is lowered and raised. Therefore, even if the conventional sewing machine foot 940 is used to sew across the row of service teeth 9 of the slide fastener, the machine foot 940 cannot get on the service teeth 9 and the machine foot 940 is stagnated. There was a problem that it would end up.

In addition, when performing sewing that crosses the 9 rows of service teeth, it is also possible to perform sewing after adjusting the foot lift amount Sp and the sewing pitch Wp separately, or changing the machine foot separately such as replacing the sewing machine foot. However, at the manufacturing site that places emphasis on production cost and workability, sewing is performed continuously using the same conditions when sewing the fabric 6 and when sewing across the 9 rows of dentitions. Preferably it is done. Furthermore, even when the fastener tape 8 is sewn on the side edge of the fabric 6 along the row of the engagement teeth 9, it is preferable to continue the sewing without any special setup change.

The present invention was created to solve such problems of the prior art, and is special in both cases of sewing a sewing object and sewing an article having a step. It is an object of the present invention to provide a sewing foot or a press member for a sewing machine that can be continuously sewn without any step change.

In order to achieve the above-described object, the present invention includes a sewing needle that moves up and down to pierce the sewing product with a sewing thread, and descends when the sewing needle is pierced into the sewing product and moves upward around the piercing portion. A sewing machine foot having a back surface pressing portion that is pressed from the outside, an outer presser having a back surface pressing portion that raises the sewing machine foot and presses the sewing product from above, and a lower feed dog that presses the sewing material from below. The vertical feed sewing machine that performs intermittent feed while pressing the upper and lower parts of the sewing product, or the press member for the sewing machine of the outer presser used in the overall feed sewing machine, performs the intermittent feed. In this case, a step pressing portion composed of a step between the upper and lower sides is formed at the back end portion on the side where the workpiece is introduced.

According to another invention, when the step between the sewing product and the sewing product to be sewn on the sewing product is T, the foot step from the back surface pressing portion to the step pressing portion. Sr is set in the range of T / 2 <Sr <T.

According to another invention, when the amount of chamfering on the chamfered portion formed between the top and end of the sewn product sewn on the sewn product is Ws, the step pressing portion The overhang amount Wr is set to be longer than the chamfering amount Ws of the sewn product.

Further, according to another invention, a step vertical wall is formed in a step portion from the back surface pressing portion to the step pressing portion.

According to another invention, the amount of chamfering of the chamfered portion formed between the top and the end of the sewn product sewn on the sewn product is set as Ws, and the feed amount of the intermittent feed is set as Ws. Wp, the lower edge chamfering amount Wb so as to satisfy the relationship Wb <Wp−Ws, where Wb is the lower edge chamfering amount of the chamfered portion formed between the back surface pressing portion and the step vertical wall. Is set.

In the press member for the sewing foot of the machine foot or the outer presser used for the vertical feed sewing machine or the general feed sewing machine, the step pressing part consisting of the step between the upper and lower sides is formed on the back surface end part on the side where the workpiece is introduced. The sewing foot can easily climb onto the sewn product on which the sewing is formed, and it is possible to continue the sewing by stepping over the step of the sewn product step by step. As a result, it is possible to perform continuous sewing without special step change both in the case of sewing a substantially flat sewing product and in the case of sewing a sewing product having a step. . Further, even when the amount of lift of the sewing machine foot is small relative to the level difference of the sewing product, it is possible to perform sewing by overcoming the level difference.

According to another aspect of the invention, when the sewing product having the step T is sewn, the foot step Sr between the back surface pressing portion of the sewing machine foot and the step pressing portion is set in a range of T / 2 <Sr <T. By setting, it is possible to sew the sewing machine foot over the step T in two stages.

According to another invention, the overhang amount Wr of the step pressing portion of the sewing machine foot is set to be longer than the chamfering amount Ws of the sewn product formed between the top and the end of the sewn product having a step. Further, it becomes possible to press the sewn product having a step from the upper side to the lower side, and it is possible to prevent a problem that the sewn product moves due to the lowering operation of the sewing machine foot.

According to another invention, since the step vertical wall is formed in the step portion from the back surface pressing portion to the step pressing portion, when the end of the sewing product comes into contact with the step vertical wall, the next intermittent operation is performed. At the time of feeding, the back surface pressing portion of the sewing machine foot gets on the sewing product more reliably.

According to another invention, the amount of chamfering of the chamfered portion formed between the top and the end of the sewn product sewn on the sewn product is set as Ws, and the feed amount of the intermittent feed is set as Ws. Wp, the lower edge chamfering amount Wb so as to satisfy the relationship Wb <Wp−Ws, where Wb is the lower edge chamfering amount of the chamfered portion formed between the back surface pressing portion and the step vertical wall. Therefore, at the time of the next intermittent feed, the back surface pressing portion of the sewing machine foot gets on the sewing product more reliably.

It is a perspective view near the needle drop position in a sewing machine provided with a sewing machine foot concerning the present invention. It is a side view showing the relationship between the sewing thing which has the level | step difference T, and the level | step difference press part of the sewing machine foot front-end | tip part which concerns on this invention. It is sectional drawing of the needle drop position vicinity in the state in which the sewing needle and the sewing machine foot are falling. It is the chart showing the timing of the comprehensive feeding method which moves a sewing machine foot, a sewing needle, and a lower feed dog in combination, and sends out cloth. It is a figure showing the timing of the up-and-down feeding method which moves an outer presser and a lower feed dog, and sends out cloth. FIG. 5 is a timing chart schematically showing the vertical movement and the front-back movement of each member with the horizontal axis as the main shaft angle of the sewing machine with respect to the timing of the comprehensive feeding method shown in FIG. 4. 6 is a timing chart schematically showing the vertical movement and the front-back movement of each member with the horizontal axis as the main shaft angle of the sewing machine with respect to the timing of the vertical feeding method shown in FIG. FIG. 7 is a side view showing the situation where the sewing machine foot gets over the sewing product during sewing, in the vicinity of the needle entry position. It is sectional drawing which shows the state which made the sewing needle penetrate the sewing thing which has the level | step difference T, and was sewn on the to-be-sewn material. It is sectional drawing which shows the state which the sewing machine foot pressed the sewing thing of the level | step difference T, and the sewing thing sank into the to-be-sewn material. FIG. 10 is a side view of the vicinity of a needle drop position showing a situation in which the sewing machine foot gets over the sewing product when sewing is performed using the comprehensive feeding method. FIG. 10 is a side view of the vicinity of a needle drop position showing a situation where the sewing machine foot gets over the sewing product when performing sewing using the vertical feed method. It is a figure explaining embodiment which formed the level | step difference press part which consists of a level | step difference between upper and lower in the back surface edge part of the side which introduces the to-be-sewn material in outer pressing. It is a side view which shows embodiment which formed the dentition guide groove in the back surface press part of the sewing machine foot. It is the perspective view which observed the sewing machine foot shown in FIG. 14 from the back surface side. It is a perspective view of the vicinity of a needle drop position showing a state in which a slide fastener is sewn to a sewing product by using a sewing machine foot in which a tooth guide groove is formed. It is a figure explaining the motion of the conventional sewing machine foot which stagnates without sewing machine foot getting on a sewing thing at the time of sewing.

Hereinafter, typical embodiments of a sewing machine foot and an outer presser (sewing machine pressing member) according to the present invention will be specifically described based on examples with reference to the drawings. In addition, the sewing machine foot and the outer presser (sewing machine pressing member) according to the present invention include an upper feed mechanism and a lower feed mechanism that are provided with an upper feed mechanism and a lower feed mechanism that perform intermittent feed while pressing the upper and lower parts of the sewing object during sewing. It can be applied to a sewing machine or a general feed sewing machine. The operation of each part in the vertical feed and the comprehensive feed will be described as needed later.

FIG. 1 is a perspective view of a sewing portion 10 in the vicinity of a needle drop position of a sewing machine provided with a sewing machine foot 40 according to the present invention. In the embodiment shown in FIG. 1, a specific example is shown in which the hidden slide fastener in a meshed state is sewn to the back side of the thick fabric 6 (one form of the sewing product) in a transverse manner. Note that the embodiment shown in FIG. 1 represents a state in which the back surface of the fabric 6 is inverted and sewn to the upper surface side.

The fabric 6 is, for example, a fabric in which a sponge is arranged on the back surface of a fabric such as an automobile seat, or a thick fabric such as leather. On the side edges of the left and right fastener tapes 8 of the hidden slide fastener, a pair of left and right injection teeth 9 (one form of a relatively hard stepped sewn product) are arranged and attached. is there. In the embodiment shown in FIG. 1, the sewing thread for sewing is not shown.

As shown in FIG. 1, the sewing portion 10 of the sewing machine includes an intermediate presser bar 14 that operates substantially in conjunction with the vertical movement of the sewing needle 12, and a cloth 6 that is fixed to the intermediate presser bar 14 and pierced by the sewing needle 12. A sewing foot 40 for holding the fabric 6 and an outer presser 16 for holding the fabric 6 when the sewing foot 40 is raised to form the seam in the fabric feed direction L.

As shown in FIG. 1, the intermediate presser bar 14 and the sewing machine foot 40 constitute an intermediate presser 22 that presses the periphery of the piercing portion of the fabric 6. Further, the intermediate presser 22 and the outer presser 16 constitute an upper presser device 24 for forming a piercing portion and a seam. A needle plate 26 having a hole through which the sewing needle 12 is passed and an opening for projecting a lower feeding device (not shown) that holds the fabric 6 from below is disposed below the upper presser 24. is there. In addition, a step difference portion having a foot step Sr and a protruding amount Wr is formed at the back end portion of the sewing machine foot 40 on the side where the fabric 6 is introduced.

2 shows the relationship between the engagement tooth 9 having the step T shown in FIG. 1 and the step pressing portion 41H formed at the tip of the sewing machine foot 40. As shown in FIG. On the left side of FIG. 2, a fabric 6 and a pair of fastener tapes 8 to which meshed engagement teeth 9 rows are attached are shown. The fabric 6 is a fabric fabric lined with a sponge, such as a seat cover of an automobile seat, or a thick sewing product such as leather. The slide fastener is used for closing the opening of the fabric 6 and is a slide fastener that can withstand a strong lateral pulling force.

The chamfering amount of the top surface chamfering Rs formed between the top and the end of the service tooth 9 in the slide fastener is defined as a chamfering amount Ws of the sewn product. Further, the chamfering amount of the lower surface chamfering Ra formed between the bottom portion and the end portion of the servicing tooth 9 is defined as a sewn article lower surface cutting amount Sa. In the embodiment shown in FIG. 2, an example is shown in which the top surface chamfering Rs and the bottom surface chamfering Ra are formed as R chamfers, but C chamfering and other chamfering shapes can also be used. is there.

2 is a side view of the sewing machine foot 40 shown in FIG. A lower surface pressing portion 41 B having a flat surface parallel to the needle plate 26 is formed on the lower surface of the sewing machine foot 40 to press the cloth 6 around the piercing portion of the sewing needle 12 from above. A step difference portion 41H having a foot step Sr and an overhang amount Wr is formed at the back end of the sewing machine foot 40 on the side where the fabric 6 is introduced. The step pressing portion 41H is formed at a position further away from the needle plate 26 than the back surface pressing portion 41B, and the step pressing portion 41H is a flat surface formed in parallel with the flat surface of the back surface pressing portion 41B. is there.

In the embodiment shown in FIG. 2, the step vertical wall 41V is formed in the step portion from the back surface pressing portion 41B to the step pressing portion 41H, and the corner radius between the step vertical wall 41V and the step pressing portion 41H is set to Rt. The bottom edge chamfering amounts of the foot bottom surface chamfer Rb between the step vertical wall 41V and the back surface pressing portion 41B are Wb and Sb. In the embodiment shown in FIG. 2, the foot bottom chamfer Rb is an R chamfer, so that Wb = Sb. In addition, an introduction slope 41I for smoothly introducing the sewing product is formed at the tip of the sewing machine foot 40 on the side where the fabric 6 is introduced. In addition, it is preferable that the corner radius Rt is smaller than the tooth top surface removal Rs of the tooth 9. In addition, by forming an introduction slope 41I at the sewing product introduction portion in the sewing machine foot 40, the sewing product can be smoothly introduced under the sewing machine foot 40, particularly when thick fabric is sewed over, Stitches can be stabilized.

In the embodiment shown in FIG. 2, the relationship between the step T and the foot step Sr is set in a range of T / 2 <Sr <T, so that the sewing machine foot 40 has two steps as described later. Overcoming T, sewing can continue. In the embodiment shown in FIG. 2, an embodiment is shown in which the step pressing portion 41H is formed in one step at the back end portion on the introduction side of the sewing machine foot 40, but the step pressing portion 41H can be formed in a plurality of steps. is there.

In addition, by setting the overhang amount Wr to be longer than the chamfering amount Ws of the sewing product, it is possible to press the service tooth 9 having a step from the upper side to the lower side. The trouble that 9 escapes can be prevented.

Further, the bottom edge surface of the foot bottom surface chamfer Rb formed between the back surface pressing portion 41B and the step vertical wall 41V is set to the sewing material chamfering amount Ws, the intermittent feed amount of the sewing machine (corresponding to the stitch pitch) Wp. By setting the bottom edge chamfering amount Wb so as to satisfy the relationship of Wb <Wp−Ws when the amount of cutting is Wb, the back surface pressing portion 41B of the sewing machine foot 40 can be more reliably performed at the next intermittent feed. Gets on the tooth 9.

Further, by forming the step vertical wall 41V that rises substantially vertically at the step portion from the back surface pressing portion 41B to the step pressing portion 41H, the back surface pressing portion 41B of the sewing machine foot 40 can be more surely secured at the next intermittent feed. Get on the tooth 9. Note that the step vertical wall 41V does not necessarily have to be vertical, and can be formed as an inclined surface in the same direction as the introduction inclined surface 41I. As in the case of the lower end edge chamfering amount Wb, it is preferable that the thickness be (Wp−Ws) or less.

Next, the movement of the sewing machine foot 40 when sewing the cloth 6 across the hidden slide fastener will be described with reference to FIG. FIG. 3 is a cross-sectional view of the vicinity of the needle drop position when the sewing needle 12 and the sewing foot 40 are lowered. Here, an explanation will be given by taking as an example a general feeding method for feeding the fabric by moving the sewing machine foot 40, the outer presser 16, the sewing needle 12 and the lower feed dog 58 in a composite manner. The same configuration can be realized when using. In addition, about the components demonstrated in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

When sewing the cloth 6 and the hidden slide fastener by the overall feeding method using the sewing machine, first, the sewing machine foot 40 is lowered to the cloth 6 side and the lower feed dog 58 is raised at the same time so that the sewing machine foot 40 and the lower feed The teeth 58 sandwich the dough 6 from above and below with a predetermined pressing force. Thereafter, as shown in FIG. 3, the sewing needle 12 is lowered to form a seam, and at the same time, the sewing machine foot 40, the lower feed dog 58 and the sewing needle 12 are moved in the cloth feeding direction L, and the cloth 6 is moved. Sending out.

Then, the main shaft of the sewing machine is rotated by the drive source to raise the sewing needle 12, and the sewing needle 12 is separated from the slide fastener and the cloth 6. Next, the sewing machine foot 40 is raised, and the sewing foot 40 releases the pressing force against the fabric 6. Further, simultaneously with the raising of the sewing machine foot 40, the lower feed dog 58 is lowered to separate the lower feed dog 58 from the fabric 6. Simultaneously with the release of the pressing force, the outer presser 16 is lowered to press the fabric 6 against the needle plate 26. At this time, the sewing machine foot 40, the lower feed dog 58, and the sewing needle 12 that are separated from the cloth 6 are advanced in the direction opposite to the cloth feeding direction L, so that the sewing machine foot 40 and the cloth 6 are moved. The seam is fed by relatively intermittent movement.

Then, the sewing machine foot 40 is lowered again to the cloth 6 side and the sewing machine foot 40 presses the cloth 6. Further, the outer presser 16 is raised to release the pressing force by the outer presser 16, and the state returns to the state shown in FIG. 3 again to form the piercing portion. By repeating this series of operations, the workpieces are sequentially sent in the L direction, and a sewing line is formed by the sewing thread 28.

Next, the timing of each operation of the sewing machine foot 40, the outer presser 16, the sewing needle 12, and the lower feed dog 58 in each of the vertical feeding method and the general feeding method will be described. First, with reference to FIG. 4, the timing of the comprehensive feeding method in which the sewing machine foot 40, the outer presser 16, the sewing needle 12, and the lower feed dog 58 are moved in a complex manner to feed the fabric 6 will be described. Each direction of ascending, descending, returning, and feeding shown in the chart is the direction shown in FIG.

As shown in FIG. 4, in the total feed method, the lower feed dog 58 rises simultaneously with the lowering of the sewing machine foot 40 to the sewing product side, and the sewing machine foot 40 and the lower feed dog 58 sandwich the fabric 6 from above and below. Thereafter, as shown in FIG. 3, the sewing needle 12 is lowered to form a piercing portion of the seam. At the same time, the sewing machine foot 40, the lower feed dog 58, and the sewing needle 12 are synchronously moved in the L direction shown in FIG.

Next, the sewing needle 12 is raised from the state shown in FIG. 3 so as to be separated from the slide fastener and the fabric 6, and then the sewing foot 40 is lifted to release the pressing force that was pressing the fabric 6. Further, simultaneously with the raising of the sewing machine foot 40, the lower feed dog 58 is also lowered and separated from the workpiece. At the same time when the pressing force is released, the outer presser 16 is lowered to press the fabric 6 with the needle plate 26.

In this state, the sewing machine foot 40, the lower feed dog 58, and the sewing needle 12 that are separated from the cloth 6 are advanced to the opposite side of the cloth feeding direction L (see FIG. 3). And the fabric 6 are moved relative to each other to form a stitch feed portion. By repeating these series of operations, the fabric 6 is intermittently fed, and a sewing line by the sewing thread 28 is formed.

Next, with reference to FIG. 5, the vertical feed method of feeding the fabric by moving the outer presser 16 and the lower feed dog 58 among the sewing foot 40, the outer presser 16, the sewing needle 12, and the lower feed dog 58. Timing will be described. Each direction of ascending, descending, returning, and feeding shown in the chart is the direction shown in FIG.

As shown in FIG. 5, in the vertical feed method, first, the lower feed dog 58 is raised with the outer presser 16 lowered, and the fabric 6 is sandwiched from above and below. Next, the sewing machine foot 40 is raised, and the outer presser 16 and the lower feed dog 58 are fed in the L direction (see FIG. 3) in that state, and a stitch feed portion is formed on the fabric 6.

When the feeding operation of the fabric 6 is finished, the sewing machine foot 40 is lowered and the fabric 6 is sandwiched between the needle plate 26 and the sewing machine foot 40. Next, the outer retainer 16 is raised and the lower feed dog 58 is lowered simultaneously to advance in preparation for the next intermittent feed operation, and a return operation is started.

Next, the sewing needle 12 is lowered to form a piercing portion of the seam. When the formation of the piercing portion is completed, the sewing needle 12 is raised, the outer presser 16 is lowered, and the lower feed dog 58 is raised at the same time, the fabric 6 is sandwiched from above and below, the sewing machine foot 40 is raised, and the next feed Start operation. By repeating this series of operations, the fabric 6 is sequentially fed in the L direction, and a sewing line by the sewing thread 28 is formed.

Next, based on the timing chart of the comprehensive feeding method shown in FIG. 4, the horizontal axis is the main shaft angle of the sewing machine, and the vertical movement and back and forth of the sewing machine foot 40, the outer presser 16, the sewing needle 12, and the lower feed dog 58 FIG. 6 shows a timing chart schematically showing the operation. Further, based on the timing chart of the vertical feed method shown in FIG. 5, the horizontal axis of the sewing machine is the main shaft angle, and the vertical movement and the longitudinal movement of the sewing machine foot 40, the outer presser 16, the sewing needle 12, and the lower feed dog 58. FIG. 7 shows a timing chart schematically representing the above. The contents shown in FIGS. 6 and 7 are the same as the contents shown in FIGS. 4 and 5, respectively, and the description thereof is omitted.

Next, the movement of the sewing machine foot 40 when performing sewing that crosses the 9 rows of the engagement teeth of the slide fastener will be described with reference to FIG. 8 (1) to 8 (3), the opposing edges of the pair of left and right fastener tapes 8 are bent upward in a U-shape, and the 9 tooth rows are symmetrically faced to the tip. The cross section of the width direction of the slide fastener lined up in the front and back direction of the paper surface is represented. 8 (1) to 8 (3), the sewing foot 40 of the vertical feed sewing machine or the general feed sewing machine performs the vertical movement and the intermittent feed movement in order to perform sewing that crosses the 9 rows of the engagement teeth. The transition state is shown. In addition, description about the sewing needle 12, the outer presser 16, the lower feed dog 58, the upper feed mechanism for performing intermittent feed, the lower feed mechanism, and the like in the vertical feed sewing machine or the comprehensive feed sewing machine is omitted.

FIG. 8 (1) shows a state where the back surface of the sewing machine foot 40 presses the fabric 6 during sewing. In this state, the sewing needle 12 (see FIG. 3) (not shown) is lowered, the sewing needle 12 is pierced through the cloth 6, and the lower thread tangled with the sewing needle 12 is raised while being lifted. In this state, the position of the end portion on the sewing machine foot 40 side of the service tooth 9 is defined as E0, and the attachment center line for attaching the sewing machine foot 40 to the sewing machine side intermediate presser bar 14 (not shown) is defined as F0. Keep it.

8 (2), the sewing machine foot 40 is lifted from the state shown in FIG. 8 (1), and the sewing foot 40 is intermittently moved to the left side relative to the fabric 6 by the sewing pitch Wp. It is a figure which shows the state which lowered | hung the sewing machine foot 40 after making it move to. At this time, since the step pressing portion 41H of the sewing machine foot 40 presses the upper surface of the service tooth 9 from above, there is a problem that the service tooth 9 moves as shown in FIG. 17 (3). do not do. 8 (2) shows a state in which the end portion on the sewing machine foot 40 side of the service tooth 9 is in contact with the step vertical wall 41V of the machine foot 40 at the position E0. The end portion may be separated from the step vertical wall 41V.

Even in the state shown in FIG. 8 (2), the sewing needle 12 (see FIG. 3) is lowered, the sewing needle 12 is inserted into the fabric 6, and the sewing needle 12 is lifted while lifting the entwined lower thread, It is possible to sew the fabric 6 normally.

8 (3), the sewing machine foot 40 is further raised from the state shown in FIG. 8 (2), and the sewing foot 40 is intermittently moved to the left side relative to the fabric 6 by the sewing pitch Wp. It is a figure which shows the state which lowered | hung the sewing machine foot 40 after moving to F2. In this case, since the back surface pressing portion 41B of the sewing machine foot 40 rides on the service tooth 9 and presses the upper surface of the service tooth 9 from above, the operation is performed as shown in FIG. There is no problem that the teeth 9 move.

Even in the state shown in FIG. 8 (3), the sewing needle 12 (see FIG. 3) is lowered, the sewing needle 12 is pierced through the fabric 6 and the fastener tape 8, and the sewing needle 12 is raised while lifting the tangled lower thread. By doing so, it is possible to normally sew the fabric 6 and the fastener tape 8. Further, the sewing machine foot 40 can be intermittently fed, and the sewing needle 12 can be pierced not only to the fabric 6 and the fastener tape 8 but also to the service teeth 9, and sewing can be performed across the service teeth 9 row. In the case of sewing across the service tooth 9 formed by injection molding, in order to prevent the service tooth 9 from being cracked or missing, the material of the service tooth 9 is relatively It is preferable to use a soft material.

Next, FIG. 9 shows a cross-sectional view in a state in which the sewing teeth 9 are sewn to the fabric 6 by performing the sewing shown in FIGS. 8 (1) to 8 (3). In addition, FIG. 9 is sectional drawing cut | disconnected along the sewing line. As shown in FIG. 9, the sewing thread 28 penetrates the service teeth 9 and the fabric 6 and sews the service teeth 9 and the fabric 6. By performing sewing using the sewing machine foot 40 according to the present invention, it is possible to perform sewing that crosses the sewn product while overcoming the sewn product having a step. Further, the sewing of only the fabric 6 and the sewing for sewing the service teeth 9 can be performed continuously without changing the stroke of the sewing machine foot 40, the foot lifting amount Sp and the sewing pitch Wp.

Next, the case where the tooth 9 is sewn on the elastic fabric 6 will be described with reference to FIG. FIG. 10 shows that the step 6 pressing portion formed on the tip of the sewing machine foot 40 (the side on which the workpiece is introduced) presses the top of the engagement tooth 9 from above, so that the elastic fabric 6 sinks. It is a figure explaining the state which has come out. When the service tooth 9 sinks into the fabric 6, the top of the service tooth 9 is lowered accordingly. Therefore, when the sewing machine foot 40 is lifted and moved intermittently by the sewing pitch Wp next time, the back surface pressing portion of the sewing machine foot 40 is operated. It becomes easy to get on the top of the tooth 9. Since the industrial sewing machine is intermittently fed at a high speed, the back surface pressing portion of the sewing machine foot 40 can press the upper surface of the service gear 9 before the submerged fabric 6 is restored. Therefore, it is possible to perform sewing by overcoming the level difference of the sewing product with a smaller foot lift amount Sp.

Next, the operation shown in FIG. 8 will be described more specifically. When the total feeding method shown in FIGS. 4 and 6 is used, the movements when the sewing machine foot 40 and the outer presser 16 ride on the trawl 9 row and cross are shown in FIGS. 11 (1) to 11 (4). It explains using.

In addition, when the vertical feed method shown in FIGS. 5 and 7 is used, the movement when the sewing machine foot 40 and the outer presser 16 ride on the trawl 9 row and traverse is shown in FIGS. ).

11 and 12, like the description in FIG. 8, in FIG. 11 and FIG. 12, the opposing edges of the pair of left and right fastener tapes 8 are bent upward in a U shape, and the 9 tooth rows are symmetrically faced at the tip. It is the figure showing the cross section of the width direction of the slide fastener put in a line by the front and back direction of the paper surface. In addition, description about the sewing needle 12, the outer presser 16, the lower feed dog 58, the upper feed mechanism for performing intermittent feed, the lower feed mechanism, and the like in the vertical feed sewing machine or the comprehensive feed sewing machine is omitted. In addition, about the member same as the member shown in FIG.3 and FIG.8, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The attachment center line of the outer presser 16 is defined as G0.

FIG. 11 (1) is an example in which the step pressing portion 41H is applied to the sewing foot 40 of the general feed sewing machine, and the sewing needle 12, the sewing foot 40, the outer presser 16, and the sewing needle at the timing f shown in FIGS. 4 is a diagram for explaining the positional relationship between the lower feed dog 58 and the lower feed dog 58. FIG. As shown in FIG. 11 (1), at the general feed timing f, the outer presser 16 and the lower feed dog 58 are raised, and the sewing machine foot 40 and the sewing needle 12 are lowered.

Then, while the sewing machine foot 40 and the lower feed dog 58 press the cloth 6 from above and below, it is going to be fed in the cloth feeding direction L together with the sewing needle 12 pierced through the cloth 6. Further, in the state shown in FIG. 11 (1), only the sewing with respect to the fabric 6 is performed, and the sewing machine foot 40 is not yet in contact with the 9th row of the engagement teeth.

FIG. 11 (2) is a diagram for explaining the positional relationship among the sewing needle 12, the sewing machine foot 40, the outer presser 16 and the lower feed dog 58 at the timing f after one cycle has elapsed from the state shown in FIG. 11 (1). It is. In the state shown in FIG. 11 (2), the step pressing portion 41 H (see FIG. 8 (2)) of the sewing machine foot 40 presses the upper surface of the engagement tooth 9 from above. Therefore, even in the state shown in FIG. 11 (2), the fabric 6 can be sewn normally. In the sewing machine in which the height at which the outer presser 16 rises most is determined by the height from the lower surface of the sewing machine foot 40, the lift amount of the outer presser 16 is set as shown in FIG. 11 (2). It is defined as Sq.

Next, FIG. 11 (3) shows the sewing machine foot 40, the lower feed dog 58 and the sewing needle 12 in the cloth feed direction L from the state shown in FIG. 11 (2), and is shown in FIGS. 4 and 6. It is a figure explaining the positional relationship of the sewing needle | hook 12, the sewing machine foot 40, the outer presser 16, and the lower feed dog 58 in the state which reached the timing i. In FIG. 11 (2), since the engagement tooth 9 is firmly clamped by the step pressing portion 40H (see FIG. 2) of the sewing machine foot 40 that is the upper feed and the lower feed tooth 58 that is the lower feed, FIG. In the state shown in 3), the service tooth 9 can be reliably pulled below the outer retainer 16. Then, the outer presser 16 that has been lowered can press the upper surface of the tooth 9 from above.

When a sewing machine is used in which the lifting amount of the sewing machine foot 40 is determined from the position where the outer presser 16 is lowered (as shown in FIG. 12 (1) described later, the height at which the sewing machine foot 40 is raised most). However, when the height from the lower surface of the outer presser 16 is determined by the height of the machine foot (Sp), the lower surface of the outer presser 16 rides on the 9th row of the service teeth, so that the sewing machine foot 40 is moved to a higher position. Can be raised. Therefore, even when such a sewing machine is used and the sewing machine foot lift amount Sp is set to be lower than the step T (see FIG. 2) of the service gear 9, the machine foot 40 and the outer presser 16 are used. Sewing can be continued over the 9th row of teeth.

Next, FIG. 11 (4) is a diagram showing a state in which the sewing machine foot 40 and the sewing needle 12 are lowered again after the sewing machine foot 40 and the sewing needle 12 have been raised and advanced from the state shown in FIG. 11 (3). FIG. 7 is a diagram for explaining the positional relationship among the sewing needle 12, the sewing machine foot 40, the outer presser 16 and the lower feed dog 58 in a state where the timing e shown in FIGS. 4 and 6 is reached. In the state shown in FIG. 11 (4), the back surface pressing portion 41B (see FIG. 2 and FIG. 8 (3)) on the lower surface of the sewing machine foot 40 rides on the service tooth 9, and presses the upper surface of the service tooth 9 from above. ing.

Even in the state shown in FIG. 11 (4), the sewing needle 12 can be lowered and the fabric 6 and the fastener tape 8 can be sewn. Further, the sewing machine foot 40 can be intermittently fed, and the sewing needle 12 can be pierced not only to the fabric 6 and the fastener tape 8 but also to the service teeth 9, and sewing can be performed across the service teeth 9 row.

Next, with respect to the movement when the sewing machine foot 40 and the outer presser 16 ride on the trawl 9 row and traverse when the vertical feed method shown in FIG. 5 and FIG. 7 is used, FIG. 4). FIG. 12A is a view for explaining the positional relationship among the sewing needle 12, the sewing machine foot 40, the outer presser 16 and the lower feed dog 58 at the timing B shown in FIGS.

As shown in FIG. 12A, at the timing B of the vertical feed, the sewing machine foot 40, the lower feed dog 58, and the sewing needle 12 are raised, the outer presser 16 is lowered, and the outer presser 16 and The fabric 6 is being fed in the feeding direction L of the fabric while the fabric 6 is being pressed down with the needle plate 26 of the sewing machine. Further, in the state shown in FIG. 12 (1), only the sewing with respect to the fabric 6 is performed, and the sewing machine foot 40 is not yet in contact with the 9 rows of the engagement teeth. As shown in FIG. 12A, the height at which the sewing machine foot 40 rises most is defined by the height from the lower surface of the outer presser 16 (foot rise amount Sp).

FIG. 12B is a diagram for explaining the positional relationship among the sewing needle 12, the sewing foot 40, the outer presser 16, and the lower feed dog 58 at the timing C shown in FIGS. 12 (2) is a view showing a state in which the sewing machine foot 40 is lowered after the cloth 6 is fed in the cloth feeding direction L from the state shown in FIG. 12 (1). In the state shown in FIG. 12 (2), the step pressing portion 41 H (see FIG. 8 (2)) of the sewing machine foot 40 presses the upper surface of the engagement tooth 9 from above. Therefore, even in the state shown in FIG. 12 (2), it is possible to normally perform sewing on the fabric 6 by inserting the sewing needle 12 into the fabric 6.

Next, FIG. 12 (3) is a diagram for explaining the positional relationship among the sewing needle 12, the sewing machine foot 40, the outer presser 16, and the lower feed dog 58 at the timing I shown in FIGS. 5 and 7. 12 (3) shows a state in which the sewing needle 12 is raised while the sewing needle 12 is lowered and pierced through the fabric 6 and the fastener tape 8 from the state shown in FIG. Represents. During this time, the outer presser 16 that has been lowered is raised and moved forward, and further lowered.

Next, FIG. 12 (4) is a diagram for explaining the positional relationship among the sewing needle 12, the sewing machine foot 40, the outer presser 16 and the lower feed dog 58 at the timing J shown in FIGS. 5 and 7. 12 (4) shows a state in which the sewing machine foot 40 is raised from the state shown in FIG. 12 (3).

When using a sewing machine in which the amount of lift of the sewing machine foot 40 is determined from the position where the outer presser 16 is lowered (when determined by the foot lift amount Sp shown in FIGS. 12 (1) and 12 (4)), the outer The sewing machine foot 40 can be raised to a higher position when the lower surface of the presser foot 16 rides on the 9th row of service teeth. Therefore, even when such a sewing machine is used and the foot lift amount Sp is set lower than the step T (see FIG. 2) of the service gear 9, the sewing machine foot 40 and the outer presser 16 have the service gear. Sewing can be continued by overcoming 9 rows.

As shown in FIGS. 11 and 12, a step pressing portion 41 H (see FIG. 2) formed of a step between the upper and lower sides is formed on the back surface end portion of the sewing machine foot 40 on the side where the sewing product is introduced. Thereby, even when the foot lift amount Sp and the outer presser lift amount Sq are set to be smaller than the step T of the sewn product (Sp, Sq <T), the following (Formula 1) and (Formula 2) By satisfying this condition, it is possible to continue sewing by overcoming the sewing product having the step T. In addition, about the foot raising amount Sp and the outer presser raising amount Sq, it is possible to use a sewing machine that can be adjusted independently of each other, or it is also possible to use a sewing machine in which both raising amounts are adjusted in conjunction with each other. .
Sp + Sr> T (Formula 1)
Sq> Sr (Formula 2)
However,
Sp: Amount of foot lift (amount of lift of the sewing machine foot relative to the bottom surface of the outer presser. See FIG. 12 (4))
Sq: Amount of increase in outer presser (amount of increase in outer presser based on the bottom surface of the sewing machine foot. See FIG. 11 (2))
Sr: Foot step (step from the back surface pressing portion of the sewing machine foot to the step pressing portion, see FIG. 2)
T: The level difference of the sewn product.

Next, an embodiment in which a step pressing portion 116H composed of a step between upper and lower portions is formed on the back surface end portion of the outer presser 116 on the side where the workpiece is introduced will be described with reference to FIG. In addition, about the site | part which has the same function as the site | part shown in FIG. 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

Although FIG. 3 shows the embodiment in which the step pressing portion 41H is formed on the back surface end portion of the sewing machine foot 40 on the side where the sewing product is introduced, the sewing product in the outer presser 116 is shown in FIG. A step pressing portion 116H (assuming that the step pressing portion 116H is formed with a foot step Sr and a protruding amount Wr as shown in FIG. 2) may be formed on the rear surface end portion on the introduction side. .

In particular, when the front end of the outer presser 116 protrudes to the side where the sewing product is introduced from the front end of the sewing machine foot 40, or when the front end of the sewing machine foot 40 and the front end of the outer presser 116 substantially coincide with each other, It is preferable to form a step pressing portion 116H at the back end portion of the presser 116 on the side where the workpiece is introduced. In the embodiment shown in FIG. 13, an embodiment in which the step vertical wall 116V is formed in the step portion from the back surface pressing portion 116B (the back surface of the outer presser 116) to the step pressing portion 116H is shown. It is not limited to this embodiment. Further, as shown in FIG. 2, a corner radius of Rt is formed between the step vertical wall 116V and the step pressing portion 116H, or a lower edge is formed between the step vertical wall 116V and the back surface of the back pressing portion 116B. A foot lower surface chamfering Rb with a chamfering amount Wb can also be formed.

As shown in FIG. 13, a step pressing portion 116 H composed of a step between the upper and lower sides is formed on the back surface end portion of the outer presser 116 on the side where the sewing product is introduced. Thereby, even when the foot lift amount Sp and the outer presser foot lift amount Sq are set to be smaller than the step T of the sewing product (Sp, Sq <T), the following (Formula 3) and (Formula 4) By satisfying this condition, it is possible to continue sewing by overcoming the sewn product having the step T.
Sq + Sr> T (Formula 3)
Sp> Sr (Formula 4)
However,
Sp: Amount of foot lift (amount of lift of the sewing machine foot relative to the bottom surface of the outer presser. See FIG. 12 (4))
Sq: Amount of increase in outer presser (amount of increase in outer presser based on the bottom surface of the sewing machine foot. See FIG. 11 (2))
Sr: Foot step (step from the back surface pressing portion of the sewing machine foot to the step pressing portion, see FIG. 2)
T: The level difference of the sewn product.

Next, with respect to an embodiment in which the step pressing portion 41H according to the present invention is formed on the sewing machine foot 140 with the tooth guide groove 142 used when the slide fastener is sewn to the side edge of the fabric 6, FIGS. This will be described with reference to FIG.

FIG. 14 is a side view of the sewing machine foot 140 formed with the tooth guide groove 142 and the step pressing portion 41H. FIG. 15 is a perspective view of the sewing machine foot 140 shown in FIG. 14 as viewed from the back side. FIG. 16 is a perspective view of the vicinity of the needle drop position showing a state in which a slide fastener is sewn on the side edge of the fabric 6 using the sewing machine foot 140 shown in FIGS. 14 and 15. In addition, about the site | part which has the same function as the site | part shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 14, a back surface pressing portion 41 B that presses the fabric 6 around the piercing portion of the sewing needle 12 from above is formed on the lower surface of the sewing machine foot 140. At the back end of the sewing machine foot 40 on the side where the fabric 6 is introduced, a step difference portion 41H having a foot step Sr and a protruding amount Wr is formed. Further, a step vertical wall 41V is formed in the step portion from the back surface pressing portion 41B to the step pressing portion 41H, the corner radius between the step vertical wall 41V and the step pressing portion 41H is Rt, and the step vertical wall 41V and the back surface pressing The lower end edge chamfering amounts of the foot lower surface chamfering Rb between the portion 41B are Wb and Sb.

In the embodiment shown in FIGS. 14 and 15, since the foot bottom chamfer Rb is R chamfering, Wb = Sb. In addition, an introduction slope 41I for smoothly introducing the sewing product is formed at the tip of the sewing machine foot 40 on the side where the fabric 6 is introduced. In the embodiment shown in FIGS. 14 and 15, an example is shown in which the introduction slope 41 I is formed as a C-chamfered slope, but it may be formed as a slope having a curvature as shown in FIG. 2. .

Further, as shown in FIG. 15, on the lower surface side of the sewing machine foot 140, when the slide fastener is sewn on the side edge of the fabric 6, the service gear guide that guides the 9 service gear rows that are vertically raised and aligned. A groove 142 is formed in a groove shape. Since the slide fastener used for closing the seat cover of the seat for automobiles has the engagement tooth 9 row attached to the edge where the fastener tape 8 is folded back, when normal sewing is performed, the sewn edge for the engagement tooth 9 row is sewn. May cause problems such as failure to sew or the sewing line to be unstable. Therefore, 9 rows of service teeth are inserted through the service gear guide grooves 142, positioning is performed, and sewing is performed while maintaining a predetermined interval in the immediate vicinity of the 9 rows of service teeth that are vertically raised and aligned. Is preferred.

FIG. 16 is a perspective view of the sewing portion 10 in the vicinity of the needle drop position of the sewing machine provided with the sewing machine foot 40 according to the present invention. In the embodiment shown in FIG. 16, a state in which the fastener tape 8 is sewn on the side edge of the fabric 6 is shown. In the embodiment shown in FIG. 16, while the back surface of the fabric 6 is the upper surface side and the service gear 9 row that is vertically raised and aligned is inserted into the service gear guide groove 142, the service tooth 9 row is inserted. The state which is sewing along is shown.

As shown in FIG. 16, by forming both the service gear guide groove 142 and the step pressing portion 41 H on the sewing machine foot 140, normal sewing on the fabric 6 and a slide fastener are sewn on the side edge of the fabric 6. The sewing and the sewing that crosses the 9 rows of the service teeth of the slide fastener can be continuously performed without performing a special setup change. Therefore, the time required for sewing can be shortened.

As shown in FIG. 16, by performing sewing with the service tooth guide groove 142 inserted into the 9th service tooth row, the interval between the sewing line and the 9th service tooth line can be stabilized and sewing disturbance can be prevented. it can. In addition, the gap between the left and right fabrics 6 that occurs when the slide fastener is closed can be reduced.

By using the sewing foot according to the present invention or a pressing member for an outer presser, it is possible to perform sewing across a slide fastener provided with a dental dentition formed by injection molding, as well as a coil fastener and a rail fastener. Further, it is possible to perform cross-sewing on a sewn product having a ball edge and other steps. Further, as described above, it can be used for sewing a seat cover of an automobile seat, and can also be used for sewing a life preserver, a tent, and other objects to be sewn.

6 Fabric (Sewing product)
8 Fastener tape (an example of sewing)
9 Teeth (an example of sewing)
12 Sewing needle (sewing needle)
14 Intermediate presser bar 16 Outer presser 22 Intermediate presser 24 Upper presser device 26 Needle plate 28

Sewing thread

40, 140, 940 Sewing foot (pressing member for sewing machine)
41B Back surface pressing portion 41H Step

pressing portions

41I, 941I Introducing slope 41V Step vertical wall 48 Needle hole 58 Lower feed dog 116 Outer presser (sewing machine pressing member)
116B Back surface pressing portion 116H Step pressing portion 116V Step vertical wall 142 Service gear guide groove L Fabric feed direction Rs Service gear upper surface removal Ra Service tooth lower surface removal Rb Foot lower surface removal Rt Corner radius Sa Sewn surface lower surface removal Sb Lower edge edge chamfering Amount Sr Foot step Sp Foot rise amount Sq External presser rise amount T Step (step on the sewn portion)
Wb Chamfering amount at bottom edge Ws Chamfering amount Wr of overhang Wr Overhang amount Wp Sewing pitch

Claims

A sewing needle (12) that moves up and down to pierce the sewing thread (6), and descends when the sewing needle (12) is pierced into the sewing object (6) and around the piercing portion. A sewing machine foot (40) having a back surface pressing portion (41B) pressed from above, and an outer surface having a back surface pressing portion (116B) for raising the sewing machine foot (40) and pressing the sewing product (6) from above. A vertical feed sewing machine that includes a presser (16, 116) and a lower feed dog (58) that presses the workpiece (6) from below, and that performs intermittent feed while pressing the upper and lower portions of the workpiece (6). Or used in a general feed sewing machine, in the sewing machine pressing member of the sewing machine foot (40) or the outer presser (16,116),
A step pressing portion (41H, 116H) composed of a step between the upper and lower sides is formed at the back end portion on the side where the sewing product (6) is introduced when the intermittent feeding is performed. Press member.
The sewing machine pressing member according to claim 1,
When the level difference between the sewing product (6) and the sewing product sewn on the sewing product (6) is T, the back surface pressing portion (41B, 116B) to the step pressing portion (41H , 116H), the step difference Sr is set in a range of T / 2 <Sr <T.
The sewing machine pressing member according to claim 1,
When the chamfered amount of the sewn product at the chamfered portion formed between the top and end of the sewn product to be sewn on the sewn product (6) is Ws, the step pressing portion (41H, 116H) A sewing machine pressing member, wherein the overhang amount Wr is set to be longer than the sewing chamfering amount Ws.
The sewing machine pressing member according to claim 1,
A pressing member for a sewing machine comprising a step vertical wall (41V, 116V) formed in a step portion from the back surface pressing portion (41B, 116B) to the step pressing portion (41H, 116H).
In the pressing member for a sewing machine according to claim 4,
The chamfering amount of the chamfered portion formed between the top and end of the sewn product to be sewn on the sewing product (6) is Ws, the feed amount of the intermittent feed is Wp, and the back surface pressing portion (41B, 116B) and the lower edge of the chamfered portion formed between the step vertical walls (41V, 116V) to satisfy the relationship of Wb <Wp−Ws, where Wb is the chamfered amount of the lower edge of the chamfered portion. A pressing member for a sewing machine characterized by setting a chamfering amount Wb.