JP3210647U - Automatic pitch adjustment device for front and rear feed teeth in a four-needle, six-thread sewing machine - Google Patents

Abstract

An automatic pitch adjusting device for front and rear feed teeth in a four-needle, six-thread sewing machine is provided. A four-needle, six-thread sewing machine includes a housing 20 and includes at least a front feed dog and a rear feed dog in the housing, and a displacement stroke between the front feed dog and the rear feed dog is limited to the support bar, The support rod is driven by the stretching rod, and the stretching rod is fixed to one end of the stitch pitch adjusting main shaft 41. The other end of the stitch pitch adjusting main shaft passes through one side of the housing and is connected to the automatic pitch adjusting device 30 to automatically The pitch adjusting device includes at least a motion member 31 pivotally provided on the housing, a push / pull bar 311 provided on the motion member, and a drive rod 32 pivotally connected to the push / pull rod at one end. And the other end of the drive rod is rotatably joined to one end of the rotary rod 33. The rotary rod has an axial movement adjustment switch knob 331 that connects and drives and rotates the stitch pitch adjustment main shaft. On both sides of the other end of the rod, each having a first position limiting cam 34 and the second position limit cam 35 which defines the stroke of the rotation is pivoted on the housing. [Selection] Figure 5

Description

  The present invention relates to an automatic pitch adjustment device for front / rear feed teeth (hereinafter referred to as front feed teeth and rear feed teeth) in a four-needle, six-thread sewing machine, and in particular, monitors an edge thread of a cloth fabric with an optical lens. The present invention relates to an automatic pitch adjustment device that adjusts sewing stitches by synchronizing the distances of movement of a feed dog and a rear feed dog.

  With the rapid development of spinning industry technology, various clothing materials different from conventional fabrics are gradually being researched and developed. As socio-economic levels improve, so does the need for materials and molding related to people's own clothing. Therefore, the structural design of the sewing machine itself must be improved as needed to address the recent complexity of clothing design.

  The four-needle, six-thread sewing machine according to the present invention mainly performs stitching by combining the edges of two fabrics as structural characteristics or functions. In the industry, it is commonly called "curve arm type sewing machine", "flat seam sewing machine" or "flat seam sewing machine".

  However, usually four needles and six threads (including four sewing threads, one lower thread and one upper decoration thread) or four needles and seven threads (four sewing threads and one lower thread) Sew with thread and two upper decorative threads). Therefore, it is commonly referred to in the industry as “four needles 6 (7) thread flat seamer sewing machine” or “four needles 6 (7) thread sewing machine”.

  The “pitch adjustment” according to the present invention adjusts the “seam pitch” formed by sewing between the sewing needle and the next sewing needle when the two sheets of fabric are stitched together.

  Specifically, to change the stitch pitch and adapt to the outer shape design of each type of garment, all traditional sewing machines are designed to have a single feed dog, and the stroke of the feed dog during use By adjusting the distance, the amount of movement of the fabric can be changed, and various stitch pitches can be formed on the fabric based on the amount of movement of the fabric.

  However, as the complexity of garment design increases day by day, sewing machines with a single feed dog have not been able to cope well with the sewing work of the garment design in recent years, and therefore the machine manufacturer has four feed teeth and four feed teeth. A six-thread sewing machine has been developed. This four-needle, six-thread sewing machine achieves more variety of sewing functions by adjusting the forward feed teeth and the reverse feed teeth, and can meet the design needs of each type of clothing in recent years. Can do.

  However, after the two fabrics (the first fabric 91 and the second fabric 92 shown in FIG. 1) are stitched together to form the stitch structure 90, the stitch pitch of the stitch structure 90 is a fixed distance from the beginning to the end. Therefore, when the edge yarns 911 and the edge yarns 921 at the end of the first fabric 91 and the second fabric 92 are pulled by external force, the seam structure 90 is loosened or broken.

  Accordingly, if the seam structure 90 in the place close to the edge thread 911 or the edge thread 921 can be further densely stitched, that is, if the stitch pitch of the sewing machine can be reduced when approaching the edge thread 911 or the edge thread 921, the seam is reduced. The problem of loosening and tearing due to the external force of the structure 90 can finally be effectively solved.

Taiwan Utility Model No. TW M526582

  Japanese Patent No. TW M526582 of Patent Document 1 discloses an automatic stroke adjusting device for a feed dog in a sewing machine. The automatic feed dog automatic stroke adjusting device in the sewing machine has a first connecting rod connected to the first end, a guide shaft rotatably connected to the second end, and a switch knob connected to the first end. A second connecting rod with a push pin projecting at the second end, a middle end pivotally mounted on the rotation shaft, a sliding groove recessed at the first end, and a long slot formed at the second end The elongated slot has a switch plate for setting the push pin through the inside.

  In this way, a signal is detected before the sensor detects a workpiece approaching the bottom of the sewing needle or before the workpiece leaves the sewing needle, and the movement rod of the moving element is driven and displaced by the signal. When the switch knob is pushed, the guide block linked to the interlocking rod moves toward the swing center of the swing arm, and the displacement stroke of the feed dog (corresponding to the forward feed dog described in the present invention) is changed. After a certain period of time, the work bar will return, and the workpiece will be sewn so that the needle down will be relatively dense at the front and end of the sewing machine, and the other parts will be sewn at the original stitch pitch. A firm seam can be obtained at the start and end of sewing.

  However, as can be seen from the contents disclosed in the prior art, the automatic stroke adjusting device according to the prior art is configured such that the moving rod of the moving element is displaced and the switch knob is pushed and the interlocking rod is interlocked to move the feed dog ( The amount of horizontal reciprocation of the front feed dog) is adjusted, but the overall displacement stroke cannot be adjusted by synchronizing the back feed dog.

  In addition, the moving rod according to the prior art is displaced and the button is pushed and the interlocking rod is interlocked to achieve the adjustment effect of the feed dog (front feed dog). Because the switch knob is pushed and switched to the maximum by receiving only the extension motion of the exercise rod, or the switch knob is pushed and switched to the minimum by receiving the contraction motion that the exercise rod returns, Certainly not in line with market demands.

  The present invention has been made in view of the above-mentioned conventional problems. The main object of the present invention is to adjust the overall displacement stroke by synchronizing the forward feed dog and the reverse feed dog in the conventional technique. To provide an automatic pitch adjustment device for front and rear feed teeth in a four-needle, six-thread sewing machine that solves the problem of inability to perform rotation and the problem of affecting the control accuracy of the stitch pitch without restricting the width of the rotational swing. is there.

  In order to achieve the above object, according to the present invention, the four-needle, six-thread sewing machine includes a housing, and the housing has at least a front feed dog and a back feed dog, and the front feed dog is a front feed dog. Driven by an interlocking rod, the forward feed dog interlocking rod is driven by a forward feed tooth push / pull rod, the forward feed tooth push / pull rod is driven by a forward feed tooth sliding rod connected to one end of a sliding member, and the rear The feed dog is driven by a back feed dog interlocking rod, the back feed dog interlocking rod is driven by a back feed tooth push / pull rod, and the back feed tooth push / pull rod is connected to the back feed tooth peristaltic rod connected to the peristaltic member. Driven, the peristaltic member is driven by a twin-axis rotary guide rod, the back-feed tooth peristaltic rod and the front-feed tooth peristaltic rod are driven synchronously, and the double-shaft rotary guide rod limits the swinging width to the support rod The support bar is driven by a stretching bar, and the stretching bar is a stitch pitch adjusting main shaft. In the automatic pitch adjusting device for the front and rear feed dogs of a four-needle, six-thread sewing machine, which is fixedly provided at one end portion and is rotatably fitted in the shaft rotation driving member, the other end of the stitch pitch adjusting main shaft Passes through from the opposite side of the housing and is connected to the automatic pitch adjusting device, and the automatic pitch adjusting device is provided at least on a movement member pivotally mounted on the housing, and is provided on the movement member, and its expansion and contraction motion is a sensor. A push-pull rod controlled by a signal transmitted from a timer; a drive rod having one end rotatably joined to the push-pull rod and pivotally mounted on the housing; the other end of the drive rod being a rotary rod The rotary rod is connected to one end of the rotary shaft, and the rotary rod is connected to a stitch pitch adjusting main shaft and has an axial movement adjustment switch knob for driving and rotating. Provided is an automatic pitch adjusting device for front and rear feed teeth in a four-needle six-thread sewing machine having a first position limiting cam and a second position limiting cam that are pivotally mounted on the housing and define a rotation stroke. .

  In the automatic feed pitch adjusting device for the forward feed dog and the backward feed dog in the 4-needle 6-thread sewing machine, the motion member is an air cylinder having a first air port and a second air port, At the time of intake or exhaust of the air port and the second air port, it is controlled by signals transmitted from the sensor and the timer.

  In the automatic pitch adjusting device for the front feed dog and the rear feed dog in the four-needle six-thread sewing machine, the moving member is a hydraulic cylinder, an electromagnet, or a motor.

In the automatic pitch adjusting device for the front feed dog and the rear feed dog in the four-needle six-thread sewing machine, a stitch pitch scale plate fixed to the housing is provided above the rotary rod.

As can be seen from the above, the substantial effect achieved as compared with the prior art of the present invention is shown as follows.
1. The seam pitch adjusting main shaft is driven and rotated by the automatic pitch adjusting device according to the present invention, and the support bar changes the movement of the biaxial rotating guide bar to change the swinging width of the peristaltic member. By changing both the longitudinal displacement distances of the interlocking rod and the reverse feed dog interlocking rod, it is possible to adjust the stitch pitch for the forward feed dog and the reverse feed dog in synchronization.
2. The automatic pitch adjusting apparatus according to the present invention has a first position limiting cam and a second position limiting cam that are pivotally mounted on the housing on both sides of the rotating rod to define the rotation stroke. To solve the problem that the rotation width of the switch knob cannot be limited, and achieve the purpose of accurately controlling the stitch pitch.

It is the schematic which shows the aspect which passes an edge thread | yarn with the stitch structure in a prior art. It is the schematic which shows the external appearance of embodiment by this invention. It is the schematic which shows the external appearance of embodiment by this invention. FIG. 4 is a schematic diagram illustrating a partial appearance of FIG. 3 according to the present invention. FIG. 5 is an enlarged schematic view illustrating an external appearance of a part of FIG. 4 according to the present invention. FIG. 5 is an enlarged schematic view illustrating an external appearance of a part of FIG. 4 according to the present invention. FIG. 5 is an enlarged schematic view illustrating an external appearance of a part of FIG. 4 according to the present invention. It is the plane schematic which attaches the automatic pitch adjusting device by this invention to the 4-needle 6-thread sewing machine. FIG. 9 is a schematic diagram illustrating a state in motion of FIG. 8 according to the present invention. FIG. 10 is a schematic plan view showing a state in motion of FIG. 9 according to the present invention and a motion state of rotating and adjusting the second position limiting cam. FIG. 11 is a schematic plan view illustrating a state in motion of FIG. 10 according to the present invention. It is the schematic which shows the aspect which passes an edge thread | yarn with the stitch structure by this invention.

  Hereinafter, a specific example for carrying out the automatic feed pitch adjusting device for the forward feed teeth and the backward feed teeth in the 4-needle 6-thread sewing machine of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is a schematic diagram illustrating an external appearance of an embodiment according to the present invention, FIG. 3 is a schematic diagram illustrating an external appearance of an embodiment according to the present invention, and FIG. 4 is a schematic diagram illustrating a partial external appearance of FIG. 3 according to the present invention. FIG. 5 is an enlarged schematic view showing an external view of a part of FIG. 4 according to the present invention. FIG. 6 is an enlarged schematic view showing an external view of a part of FIG. 4 according to the present invention. 7 is an enlarged schematic view showing an external appearance of a part of FIG. 4 according to the present invention.

  Referring to FIGS. 2 to 7, in the automatic feed pitch adjusting device for the front feed dog and the back feed dog in the four-needle six-thread sewing machine according to the present invention, the four-needle six-thread sewing machine 10 includes a housing 20, and at least The housing 20 has at least a feed dog 62 and a feed dog 72.

  The front feed dog 62 is driven by the front feed dog interlocking rod 60, the front feed dog interlocking rod 60 is driven by the front feed dog push / pull rod 61, and the front feed dog push / pull rod 61 is connected to one end of the peristaltic member. Driven by the feed dog peristaltic rod 55, the reverse feed dog 72 is driven by the reverse feed dog interlocking rod 70, the reverse feed dog interlocking rod 70 is driven by the reverse feed dog push-pull rod 71, and the reverse feed dog push-pull rod 71 is Driven by the reverse feed dog peristaltic rod 53 connected to the peristaltic member, the peristaltic member 50 is driven by the biaxial rotation guide rod 42, and the reverse feed dog peristaltic rod 53 and the front feed dog peristaltic rod 55 are driven in synchronism. The biaxial rotation guide rod 42 is limited in swinging width by the support rod 412, and the support rod 412 is driven by the extending rod 411.

An extending rod 411 is fixed to one end portion of the stitch pitch adjusting main shaft 41, and the stitch pitch adjusting main shaft 41 is rotatably fitted in the shaft rotation driving member 40.
The other end of the stitch pitch adjusting main shaft 41 passes from the opposite side of the housing 20 and is connected to the automatic pitch adjusting device 30.

  The automatic pitch adjusting device 30 includes at least a motion member 31 pivoted on the housing 20, and a push provided on the motion member 31 and whose expansion and contraction motion is controlled by a signal (not shown) transmitted from a sensor and a timer. The pull bar 311 has a drive bar 32 pivotally attached to the housing 20 and having one end rotatably joined to the push / pull bar 311.

  The other end of the drive rod 32 is rotatably joined to one end of the rotary rod 33, and the rotary rod 33 has an axial movement adjustment switch knob 331 for connecting and driving and rotating the stitch pitch adjustment main shaft 41. On both sides of the other end of the rotating rod 33, there are a first position limiting cam 34 and a second position limiting cam 35 which are pivotally mounted on the housing 20 and define a rotation stroke.

  The motion member 31 is an air cylinder having a first air port 301 and a second air port 302. When the first air port 301 and the second air port 302 are inhaled or exhausted, signals transmitted from sensors and timers. It is controlled by.

  The motion member 31 may be a hydraulic cylinder, an electromagnet, or a motor.

  Above the rotary rod 33, a stitch pitch scale plate 36 fixed to the housing 20 is further provided to provide the user with more accurate control of the stitch pitch.

  Further, the forward feed tooth push / pull rod 61 is further limited to the front push / pull brake rod 84, and the front push / pull brake rod 84 is driven by a front torque-type shaft pull rod 82 that is pivotally connected to the swinging member fixing shaft 51, and the front torque. The shaft pulling rod 82 is driven by a front feed dog adjusting unit 80 provided outside the housing 20, the rear feed tooth push / pull rod 71 is further limited to the push / pull brake rod 85, and the push / pull brake rod 85 is a sliding member fixed shaft. The rear torque type shaft pulling rod 83 pivoted to 51 is driven by a rear feed dog adjusting unit 81 provided outside the housing 20.

  7 is an enlarged schematic view showing the appearance of FIG. 4 according to the present invention, FIG. 8 is a schematic plan view of the automatic pitch adjusting device according to the present invention attached to a four-needle six-thread sewing machine, and FIG. 9 according to the present invention. FIG. 10 is a schematic diagram illustrating a state during the movement of FIG. 8, and FIG. 10 is a schematic plan view illustrating the state of the movement of FIG. 9 according to the present invention and a movement state of rotating to adjust the second position limiting cam. 11 is a schematic plan view showing a state in motion of FIG. 10 according to the present invention, and FIG. 12 is a schematic diagram showing a state in which the edge thread is passed through the stitch structure according to the present invention.

  Further, referring to FIGS. 7 to 12, the four-needle, six-thread sewing machine 10 is filled with air in the first air port 301 of the motion member 31 in a normal state before sewing, and the push-pull bar 311 is used. Is maintained in an extended state in a normal state (shown in FIG. 8), that is, the rotating rod 33 is turned to a side where a relatively large stitch pitch is positioned in a normal state, and the first fabric 91 in FIG. The seam structure 90 is formed immediately when the second fabric 92 is subjected to flat seam sewing.

  At this time, after a sensor (not shown) detects the approach of the edge yarn 911 and the edge yarn 921, a signal is transmitted to control the intake of the second air port 302 of the motion member 31, and the push-pull bar 311 contracts. Then, the drive rod 32 is pulled to rotate the rotary rod 33, that is, the rotary rod 33 is turned to the side where a relatively small stitch pitch is located (shown in FIG. 9).

  At this time, the shaft movement adjustment switch knob 331 rotates the stitch pitch adjusting main shaft 41 to change both the front and rear displacement distances of the front feed dog 62 and the rear feed tooth 72, thereby reducing the stitch pitch and a timer (not shown). ) After a preset time (about 5 seconds), another signal is transmitted to control the intake of the first air port 301 and the exhaust of the second air port 302 by the motion member 31, and the push-pull bar 311 It extends again and pushes the drive rod 32 to rotate the rotating rod 33. That is, the rotating rod 33 is turned again to one side where a relatively large stitch pitch is located (shown in FIG. 10).

  At this time, the shaft movement adjustment switch knob 331 rotates the stitch pitch adjusting main shaft 41 to change both the front and rear displacement distances of the front feed dog 62 and the rear feed dog 72, and the stitch pitch returns to the normal state again. A densely sewn area 901 is formed by sewing (shown in FIG. 12).

  Similarly, when the edge yarn 911 or the edge yarn 921 approaches the sensor immediately before the first fabric 91 and the second fabric 92 are stitched, the seam structure similarly forms a dense stitch area 901.

  If the user finds that the stitch pitch of the densely stitched area 901 is too small, the user rotates the second position limiting cam 35 as shown in FIG. 10 and turns the rotating bar 33 to the side where the relatively small stitch pitch is located. Limited when done and slightly enlarged (shown in FIG. 11) to achieve the goal of accurately controlling the stitch pitch.

  Similarly, when the user sees that the stitch pitch of the stitch structure 90 is too large, the user similarly rotates the first position limiting cam 34 and turns the rotary bar 33 to the side where the relatively large stitch pitch is located. It can be limited when it is done, and it can be reduced slightly.

  As can be seen from the above, in the present invention, the stitch pitch adjusting main shaft 41 is driven and rotated by the automatic pitch adjusting device 30, and the support bar 412 changes the motion of the biaxial rotation guide bar 42 to swing the swinging member 50. The purpose of adjusting the stitch pitch synchronously with respect to the forward feed teeth 62 and the reverse feed teeth 72 by changing the width and changing the longitudinal displacement distance of the forward feed dog interlocking rod 60 and the reverse feed dog interlocking rod 70 together. To achieve.

  Further, in the present invention, the first position limiting cam 34 and the second position limiting cam 35 that are pivotally mounted on the housing 20 and define the rotation stroke are provided on both sides of the rotating bar 33, so that the stitch pitch can be accurately set. Achieve control objectives.

  Although the contents of the present invention have been described above, what has been described above is a preferred embodiment of the present invention, and is not limited to the scope of the present invention, but is equivalent to the scope of the utility model registration claim of the present invention. All deformations and modifications are within the scope of the utility model registration claim of the present invention.

10: Four-needle, six-thread sewing machine 20: Housing 30: Automatic pitch adjusting device 301: First air port 302: Second air port 31: Movement member 311: Push-pull bar 32: Drive bar 33: Rotating bar 331: Shaft Dynamic adjustment switch knob 34: first position limiting cam 35: second position limiting cam 36: stitch pitch scale plate 40: shaft rotation driving member 41: stitch pitch adjusting main shaft 411: extension rod 412: support rod 42: biaxial rotation guide Bar 50: Peristaltic member 51: Peristaltic member fixed shaft 53: Reverse feed dog peristaltic bar 55: Front feed dog peristaltic bar 60: Front feed dog interlocking bar 61: Front feed dog push-pull bar 62: Front feed dog 70: Rear feed dog Interlocking rod 71: Reverse feed dog push / pull rod 72: Reverse feed dog 80: Front feed dog adjusting unit 81: Reverse feed dog adjusting unit 82: Front torque type shaft pull rod 83: Rear torque type shaft pull rod 84: Pushing and pulling the brake rod 85: boost pull braking bar 90: seam structure 901: dense stitching zone 91: first fabric 911: En'ito 92: second fabric 921: En'ito

Claims (4)

The four-needle, six-thread sewing machine has a housing, and has at least a front feed dog and a rear feed dog in the housing, the front feed dog is driven by a front feed dog interlocking bar, and the front feed dog interlocking bar Driven by the feed dog push / pull rod, the front feed dog push / pull rod is driven by a front feed dog sliding rod connected to one end of the sliding member,
The reverse feed dog is driven by a reverse feed dog interlocking rod, the reverse feed dog interlocking rod is driven by a reverse feed tooth push-pull rod, and the post-feed tooth push-pull rod is connected to the other end of the sliding member. Driven by the feed dog peristaltic bar,
The peristaltic member is driven by a twin-shaft rotary guide rod, and is driven in synchronism with a reverse feed dog peristaltic rod and a forward feed tooth peristaltic rod. The support bar is driven by a stretching bar, and the stretching bar is fixed to one end of a seam pitch adjusting main shaft, and the seam pitch adjusting main shaft is rotatably fitted in a shaft rotation driving member. In the automatic pitch adjustment device of the front and rear feed dogs,
The other end of the stitch pitch adjusting main shaft passes through the opposite side of the housing and is connected to the automatic pitch adjusting device,
The automatic pitch adjusting device includes at least a moving member pivoted on the housing;
A push-pull bar provided on the moving member and whose telescopic motion is controlled by a signal transmitted from a sensor and a timer;
A drive rod having one end rotatably joined to the push-pull rod and pivoted to the housing;
The other end of the driving rod is rotatably joined to one end of the rotating rod, the rotating rod is connected to a stitch pitch adjusting main shaft, and has an axial movement adjusting switch knob for driving and rotating, Front and rear in a four-needle, six-thread sewing machine having a first position limiting cam and a second position limiting cam pivotally mounted on the housing on both sides of the other end of the rotating bar respectively to define a rotation stroke Automatic pitch adjustment device for the feed dog.   The moving member is an air cylinder having a first air port and a second air port, and a signal transmitted from the sensor and the timer at the time of intake or exhaust of the first air port and the second air port. The automatic pitch adjusting device for front and rear feed teeth in a four-needle, six-thread sewing machine according to claim 1, wherein   2. The automatic pitch adjustment device for front and rear feed teeth in a four-needle, six-thread sewing machine according to claim 1, wherein the moving member is a hydraulic cylinder, an electromagnet, or a motor.   The front-rear feed in the four-needle, six-thread sewing machine according to any one of claims 1 to 3, wherein a stitch pitch scale plate fixed to the housing is provided above the rotating bar. Automatic tooth pitch adjustment device.

Images