JP2009160029A - Upper feeding device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and surely carry a sewing article by increasing a force to carry a sewn article in such a manner that a period of time by which an upper feed dog depresses the sewing article under a horizontal state to the sewing article is made longer. <P>SOLUTION: This upper feeding device of a sewing machine includes a vertically moving mechanism 7, and a horizontally moving mechanism 13. In this case, the vertically moving mechanism 7 has a vertical movement base 5, and a vertical guide base 6 which regulates the vertical movement base 5 in a manner to make it move in the vertical direction only. The horizontally moving mechanism 13 has a horizontal movement base 11, and a horizontal guide base 12 which regulates the horizontal movement base 11 in a manner to make it move in the horizontal direction only to the sewing article. The lower surface of the upper feed dog 2 is arranged to be horizontal to the sewing article, and the upper feed dog 2 is fixed and connected to the horizontal movement base 11. At the same time, the vertical movement base 5 and the horizontal guide base 12 are connected with each other, and the upper feed dog 2 is made to perform an ellipse movement by the cooperation of the vertically moving mechanism 7 and the horizontally moving mechanism 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine top feed device, and more particularly to a sewing machine top feed device that presses a top feed dog against a sewing product and conveys the sewing product by an elliptical motion of the top feed dog.

  Conventionally, for example, in a flat stitch sewing machine that performs decorative sewing while transporting a sewing product such as a cloth in a predetermined direction, when the cloths are stacked and stitched together, both the cloths can be reliably transported so that there is no displacement. In view of the above, an upper feed device that transports the sewing product by pressing the upper surface of the sewing product with the upper feed dog and moving the upper feed dog in the transport direction is used.

  FIGS. 6A to 6D are schematic perspective views showing an example of a conventional flat stitch sewing machine top feed device. In a conventional flat stitch sewing machine top feed device 31, the upper feed teeth 32 are vertically moved. It is fixedly connected to the upper feed shaft 33 extending in the direction. Above the upper feed dog 32, a bearing support base 35 for supporting the upper feed shaft 33 is provided, and the bearing support base 35 is formed with a circular hole 35a penetrating in the horizontal direction. A cylindrical bearing 36 is loosely fitted in the hole 35a of the bearing support base 35 so as to be rotatable. The bearing 36 has a hole 36a penetrating in the vertical direction. A long hole 35 b is formed at a position facing the hole 36 a of the bearing 36 along the rotation direction of the bearing 36. The upper feed shaft 33 is inserted into the hole 36 a of the bearing 36 so as to be movable up and down, and is inserted into the elongated hole 35 b of the bearing support base 35 so as to move back and forth in accordance with the rotation of the bearing 36.

  Further, the upper feed shaft 33 is located above the bearing 36 in a vertical movement drive mechanism (not shown) for moving the upper feed shaft 33 up and down, and in a longitudinal movement (not shown) for moving the upper feed shaft 33 back and forth around the bearing 36 as an axis. The upper feed device 31 is connected to the drive mechanism, and the upper feed gear 31 is moved in the elliptical motion by moving the upper feed shaft 33 back and forth while moving the upper feed shaft 33 up and down by each drive mechanism. The upper feed dog 32 moves in the conveying direction while pressing the cloth 38 in the elliptical motion.

  And the flat stitch sewing machine provided with such an upper feed device 31 sandwiches both the cloths 38 by the lower feed dog and the upper feed teeth 32, and conveys the cloth 38 by the cooperation of the both feed dogs. ing.

JP 07-328258 A

  However, according to the upper feed device 31 of the conventional flat stitch sewing machine as described above, the upper feed shaft 33 to which the upper feed teeth 32 are coupled is moved back and forth about the rotating bearing 36 as an axis. Therefore, when performing the elliptical motion, when the upper feed shaft 33 is positioned at the last retracted position in the longitudinal movement of the upper feed shaft 33 shown in FIG. 6C, the upper feed dog 32 is inclined with respect to the cloth 38. Only the rearmost end in the conveying direction of the cloth 38 is in contact with the cloth 38. Further, when the upper feed shaft 33 is positioned at the most advanced position in the longitudinal movement of the upper feed shaft 33 shown in FIG. 6D, the upper feed dog 32 is disposed to be inclined with respect to the cloth 38. Only the foremost end in the conveying direction comes into contact with the cloth 38. And according to the conventional upper feed device 31, the upper feed shaft 33 is the bottom dead center in the vertical movement of the upper feed shaft 33 shown in FIG. 6 (a), and the upper feed shaft 33 shown in FIG. 6 (b). Only when it is located at the top dead center in the vertical movement, the upper feed dog 32 is arranged horizontally with respect to the cloth 38 to be conveyed.

  For this reason, in the conventional upper feed device 31, the upper feed dog 32 performs an elliptical motion while the lower surface thereof is inclined with respect to the cloth 38, so that the lower surface of the upper feed dog 32 is horizontal with respect to the cloth 38, The time for pressing the cloth 38 by the entire tooth portion of the upper feed dog 32 was short. For this reason, the conventional upper feed device 31 has a problem that the force to convey the cloth 38 is weak, it is difficult to efficiently and reliably convey the cloth 38, and the sewing quality may be deteriorated. Had.

  The present invention has been made in view of these points, and in a state where the upper feed dog is in a horizontal state with respect to the sewing product, the time for pressing the sewing product with the entire tooth portion of the upper feed dog is lengthened, thereby sewing. An object of the present invention is to provide an upper feed device for a sewing machine that can efficiently and surely convey a sewing product by increasing the force for conveying an article.

  In order to achieve the above object, the upper feed device of the sewing machine according to the invention described in claim 1 is characterized in that the sewing product is driven in a predetermined conveying direction by driving the upper feed dog against the upper surface of the sewing product. In the upper feed device of the sewing machine transported to the vertical movement mechanism, the vertical movement mechanism having a vertical movement table and a vertical guide table for restricting the vertical movement table to move only in the vertical direction, a horizontal movement table and the horizontal movement table are sewn. And a horizontal movement mechanism having a horizontal guide base that restricts movement only in the horizontal direction with respect to the workpiece, wherein the lower surface of the upper feed dog is disposed horizontally with respect to the sewing product, and the upper feed dog Are fixedly connected to the vertical movement table or the horizontal movement table, and the vertical movement mechanism and the horizontal movement mechanism are connected to each other, and the upper feed is achieved by the cooperation of the vertical movement mechanism and the horizontal movement mechanism. tooth It lies in to elliptical motion.

  According to the first aspect of the present invention, the vertical movement mechanism and the horizontal movement mechanism are connected, and the operation of the vertical motion table is restricted only in the vertical direction by the vertical guide table. The operation is restricted only in the horizontal direction by the horizontal guide table. For this reason, in the upper feed device, when the upper feed dog performs an elliptical motion by the cooperation of the vertical movement mechanism and the horizontal movement mechanism, the upper feed dog is always positioned horizontally with respect to the sewing product. The time during which the sewing product is pressed by the entire tooth portion of the upper feed dog can be lengthened by the horizontal state with respect to the sewing product.

  The sewing machine according to claim 2 is characterized in that in the sewing machine according to claim 1, the horizontal guide table is connected to the lower end of the vertical motion table, The upper feed dog is connected to the horizontal movement table.

  According to the second aspect of the present invention, the vertical movement mechanism and the horizontal movement mechanism are connected by connecting the vertical movement table and the horizontal guide table, and the vertical movement table is operated only in the vertical direction by the vertical guide table. The movement of the horizontal motion table is restricted only in the horizontal direction by the horizontal guide table. For this reason, in the upper feed device, when the upper feed dog performs an elliptical motion by the cooperation of the vertical movement mechanism and the horizontal movement mechanism, the upper feed dog is always positioned in a horizontal state with respect to the sewing product. However, it is possible to lengthen the time during which the sewn product is pressed by the entire tooth portion of the upper feed dog in a state horizontal to the sewn product.

  The sewing machine according to the third aspect of the present invention is characterized in that the sewing machine according to the first or second aspect of the invention is the sewing machine according to the first or second aspect, wherein the upper feed dog is set in the placement direction of the sewing product. It is in the point which has the elastic member to urge.

  According to the third aspect of the present invention, the upper feed dog is urged by the elastic member in the placement direction of the sewing product, so that the cloth of the sewing product is partially overlapped with other parts as compared with other parts. Even when the upper feed dog presses the thick part, by compressing the elastic member, the upper feed dog does not move to the lowest point of the elliptical motion, and the sewing product is damaged by excessive force. Can be avoided.

  As described above, according to the top feed device of the sewing machine according to the present invention, it is possible to lengthen the time for which the top feed dog presses the sewn product in a horizontal state with respect to the sewn product. Therefore, the sewing force can be conveyed efficiently and reliably.

  Hereinafter, an embodiment of a top feed device of a sewing machine according to the present invention will be described with reference to FIGS. Here, in the present embodiment, a description is given using a flat stitch sewing machine as the sewing machine, but the present invention is not limited to this.

  FIG. 1 is a schematic perspective view showing an upper feed device of a flat stitch sewing machine according to the present embodiment.

  As shown in FIG. 1, the upper feed device 1 of the flat stitch sewing machine of the present embodiment has an upper feed dog having a predetermined length along the conveyance direction of the cloth 3 provided above the cloth 3 as a sewing product. 2, and the lower surface of the upper feed dog 2 is formed in a saw blade shape and is disposed horizontally with respect to the cloth 3.

  Further, the upper feed device 1 includes a vertical bar-like vertical motion table 5 that is long in the vertical direction and moves up and down, and a vertical guide table 6 that restricts the vertical motion table 5 to move only in the vertical direction. A moving mechanism 7 is provided.

  The vertical guide base 6 is fixed to a frame of a flat sewing machine (not shown), and the vertical guide base 6 is formed with a square groove 6a into which the vertical motion base 5 extending in the vertical direction can be loosely fitted. ing. A pin 21 projects from the upper end of the vertical motion table 5 and can move in the longitudinal direction of the long hole 8a into a long hole 8a provided in one end of the vertical link body 8 extending in the vertical direction. Are loosely fitted. Moreover, the pin 21 is urged | biased by the lower end direction of the long hole 8a with the spring 21 installed in the long hole 8a. The other end of the vertical link body 8 is rotatably connected to the tip of a lever 9 a formed at one end of the upper feed vertical shaft 9. The upper feed vertical shaft 9 is connected to a drive mechanism (not shown) so as to be reciprocally rotatable, and the vertical motion table 5 loosely fitted in the square groove 6a of the vertical guide table 6 is provided with the upper feed vertical shaft 9. , The upper and lower link bodies 8 are moved along the angular grooves 6a of the upper and lower guides 6 only in the vertical direction.

  Further, the upper feed device 1 is formed in a horizontal direction that is long in the horizontal direction with respect to the conveyance direction of the cloth 3 and moves horizontally in the conveyance direction, and the horizontal movement table 11 moves only in the horizontal direction. It has a horizontal movement mechanism 13 having a horizontal guide stand 12 for restricting it.

  The horizontal guide table 12 is connected to the lower end of the vertical motion table 5 and is formed integrally with the vertical motion table 5 so as to move up and down according to the vertical motion of the vertical motion table 5. 7 and the horizontal movement mechanism 13 are connected. Further, the horizontal guide table 12 is formed with a square groove 12a into which the horizontal motion table 11 extending in the horizontal direction can be loosely fitted. One end portion of the horizontal motion table 11 is rotatably connected to one end portion of a horizontal link body 15 extending in the horizontal direction, and the other end portion of the horizontal link body 15 is one end portion of the upper feed horizontal shaft 16. Is pivotably connected to the tip of a lever 16a. The upper feed horizontal shaft 16 is connected to a drive mechanism (not shown) so as to be reciprocally rotatable, and the horizontal motion table 11 loosely fitted in the rectangular groove 12a of the horizontal guide table 12 is provided with the upper feed horizontal shaft 16. With this rotation, the reciprocation is made along the square groove 12a of the horizontal guide stand 12 via the horizontal link body 15 so as to move only in the horizontal direction.

  A columnar upper feed dog support 18 protrudes from the lower end of the horizontal motion table 11 and is formed integrally with the horizontal motion table 11. The upper feed dog 2 is fixedly connected via 19. A long groove 12b in which the upper feed dog support portion 18 is disposed is formed at the lower end of the horizontal guide base 12, and the upper feed dog support portion 18 can move horizontally along with the horizontal movement of the horizontal motion table 11 in the long groove 12b. It is formed so long in the horizontal direction.

  Thus, the upper feed dog 2 is fixedly connected to the horizontal motion table 11 via the upper feed dog support portion 18 and moves horizontally according to the horizontal motion of the horizontal motion table 11, and the horizontal motion of the horizontal motion table 11. The vertical movement table 5 formed integrally with the horizontal guide table 12 that regulates the vertical movement moves up and down, and the vertical movement mechanism 7 and the horizontal movement mechanism 13 cooperate to perform elliptical movement. And the upper feed dog 2 presses the cloth 3 placed on the needle plate in the elliptical motion.

  The upper feed device 1 is arranged inside an arm portion (not shown) in the frame of the flat stitch sewing machine. Further, a needle bar having a sewing needle attached to the lower end portion can move up and down inside the arm portion. Is provided. Further, a presser for pressing the cloth 3 is disposed above the needle drop point where the sewing needle on the needle plate drops. The presser is a presser located inside the arm portion and in the vicinity of the needle bar. It is connected to the lower end of the shaft. A through hole for allowing the sewing needle to drop below the needle plate is formed at a position corresponding to the needle drop point of the sewing needle in the presser, and this presser is a biasing force of a spring built in the presser shaft. By this, the cloth 3 placed on the needle plate is pressed. The upper feed teeth 2 of the upper feed device 1 are arranged so as to feed the cloth through the opening groove provided in the holding boat. Further, a lower feed dog is provided in a position facing the upper feed dog 2 inside the bed so that the lower feed dog moves in an elliptical manner in conjunction with the upper feed dog 2. The upper feed dog 2 and the lower feed dog are oval so that the teeth 2 are pressed against the upper surface of the cloth 3 and the lower feed dog is pressed against the lower surface of the cloth 3 so that the cloth 3 is held between the upper feed dog 2 and the lower feed dog. The cloth 3 is transported in the transport direction by being moved.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 2A, when the vertical motion table 5 of the vertical movement mechanism 7 is located at the top dead center, the lower surface of the upper feed dog 2 is horizontal with respect to the cloth 3 placed on the needle plate. It is a state.

  Next, as shown in FIG. 2 (b), the vertical movement table 5 is moved downward along the grooves of the vertical guide table 6 by rotating the upper feed vertical axis 9 in a predetermined direction and moving the vertical movement table 5 along the respective grooves of the vertical guide table 6. 5 is moved downward, and the upper feed horizontal shaft 16 is rotated in a predetermined direction to move the horizontal motion table 11 along the grooves of the horizontal guide table 12 to the most advanced position. . At this time, since the horizontal motion table 11 moves along each groove of the horizontal guide table 12, the lower surface of the upper feed dog 2 connected to the horizontal motion table 11 via the upper feed dog support 18 is It is in a state horizontal to the cloth 3.

  Subsequently, as shown in FIG. 2 (c), the upper feed vertical shaft 9 is rotated in a predetermined direction, and the vertical motion table 5 is lowered along each groove of the vertical guide table 6 to be positioned at the bottom dead center. As a result, the horizontal guide table 12 is lowered and the upper feed horizontal shaft 16 is reversely rotated in a predetermined direction to move the horizontal motion table 11 along each groove of the horizontal guide table 12 along the conveying direction of the cloth 3. Let Also at this time, since the horizontal motion table 11 moves along each groove of the horizontal guide table 12, the upper feed dog 2 is a tooth portion of the upper feed dog 2 with the lower surface horizontal to the cloth 3. The cloth 3 is conveyed in the conveyance direction by moving in the conveyance direction of the cloth 3 while pressing the cloth 3 as a whole.

  Further, as shown in FIG. 2 (d), the upper feed vertical shaft 9 is reversely rotated in a predetermined direction to raise the vertical motion table 5 along each groove of the vertical guide table 6, thereby causing the horizontal guide table 12 to rise. And the upper feed horizontal shaft 16 is reversely rotated in a predetermined direction to move the horizontal motion table 11 along the respective grooves of the horizontal guide table 12 to the last retracted position. Also at this time, since the horizontal motion table 11 moves along each groove of the horizontal guide table 12, the lower surface of the upper feed dog 2 is in a horizontal state with respect to the cloth 3.

  Here, the upper feed dog 2 is attached to the connecting member 19 so as to be adjusted in the height direction in accordance with the thickness of the cloth 3 and takes a locus of elliptical motion as shown in FIG. It will be. However, when the upper feed dog 2 presses the thick portion 3a of the cloth 3 having a partially thick fabric as shown in FIG. 4, the upper feed dog 2 is prevented from descending by the increased thickness. In this embodiment, as shown in FIG. 5A, the pin 22 is normally positioned at the lower end of the elongated hole 8 a by the biasing spring 21, but the upper feed dog 2 is the cloth in the cloth 3. While the thick portion 3a is pressed, the pin 22, the upper feed support portion 18, the connecting member 19, and the upper feed dog 2 are usually moved by compressing the biasing spring 21, as shown in FIG. The height of the fabric is higher than the lowest point of the elliptical motion. In addition, during this time, the horizontal motion table 11 extends along the angular groove 12a of the horizontal guide table 12 held at a high position corresponding to the increase in the fabric thickness from the normal lowest point, like the upper feed dog 2 and the like. Therefore, the upper feed dog 2 can be conveyed while pressing the cloth 3 at a higher position corresponding to the increase in the cloth thickness than the normal lowest point. That is, the motion locus in which the lower end portion of the ellipse is linearly deformed as shown in FIG.

  Further, after the part 3a having a thick cloth is partially conveyed in the cloth 3, the lowering of the upper feed dog 2 is not hindered, so that the spring 21 returns to the normal length, and the upper feed dog 2 is also normal. Perform an elliptical motion.

  Thus, according to the present embodiment, the vertical motion table 5 and the horizontal guide table 12 are connected, and the operation of the vertical motion table 5 is restricted only in the vertical direction by the vertical guide table 6 and is The movement of the exercise table 11 is restricted only in the horizontal direction by the horizontal guide table 12. For this reason, in the upper feed device 1 of this embodiment, when the upper feed dog 2 performs an elliptical motion by driving the vertical movement mechanism 7 and the horizontal movement mechanism 13, the lower surface of the upper feed dog 2 is always on the needle plate. It will be in a horizontal state with respect to the placed cloth 3.

  Therefore, the upper feed device 1 of the present embodiment has a time during which the upper feed dog 2 presses the cloth 3 with the entire tooth portion of the upper feed dog 2 in a state where the lower surface of the upper feed dog 2 is horizontal with respect to the fabric 3. Since the length can be increased, the force for transporting the cloth 3 can be increased, whereby the cloth 3 can be transported efficiently and reliably.

  Moreover, in this embodiment, when conveying the thick cloth part in the cloth 3 which is partly thick, by compressing the urging spring 21, the pin 22, the upper feed support portion 18, and the connecting member 19 are used. The upper feed dog 2 is held at a high position corresponding to the increase in the fabric thickness from the lowest point of the normal elliptical motion. In addition, during this time, the horizontal motion table 11 extends along the angular groove 12a of the horizontal guide table 12 held at a high position corresponding to the increase in the fabric thickness from the normal lowest point, like the upper feed dog 2 and the like. And continue to move horizontally. For this reason, the upper feed dog 2 can be conveyed while pressing the cloth 3 at a higher position corresponding to the increase in the cloth thickness than the normal lowest point. According to the apparatus 1, the upper feed dog 2 can transport the cloth 3 without applying an excessive force to the cloth 3 and damaging it.

  In addition, this invention is not limited to the said embodiment, A various change is possible as needed.

  For example, in the present embodiment, the vertical movement mechanism 5 and the horizontal guide base 12 are connected to connect the vertical movement mechanism 7 and the horizontal movement mechanism 13, and the upper and lower movement mechanisms 7 and the horizontal mechanism cooperate with each other. Although the feed dog 2 is moved elliptically, the present invention is not limited to this. For example, the horizontal movement table 11 and the vertical guide table 6 are connected to connect the vertical movement mechanism 7 and the horizontal movement mechanism. The mechanism 13 may be connected. Further, the mechanism for moving the vertical motion table 5 up and down and the mechanism for moving the horizontal motion table 11 horizontally are not limited to this embodiment, and the vertical motion table 5 is moved only in the vertical direction by the vertical guide table 6. What is necessary is just to restrict | limit so that the horizontal motion stand 11 may be moved only to a horizontal direction with the horizontal guide stand 12.

1 is a schematic perspective view showing an embodiment of an upper feed device of a sewing machine according to the present invention. (A)-(d) is a schematic side view which shows each position in the elliptical motion of the upper feed dog in the upper feed apparatus of FIG. (A) (b) is a schematic side view showing the movement trajectory of the upper feed dog FIG. 1 is a schematic side view showing a case where a partially thick cloth is conveyed in the upper feeding device of FIG. (A) (b) is a schematic side view which shows the compression state of the elastic member 21 in the case of conveying the cloth with thick cloth partially in FIG. (A)-(d) is a schematic perspective view which shows an example of the conventional top feed apparatus of a sewing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top feed device 2 Top feed dog 5 Vertical motion stand 6 Vertical guide stand 6a Square groove 7 Vertical motion mechanism 8 Vertical link body 9 Upper feed vertical axis 11 Horizontal motion stand 12 Swimming guide stand 12a Square groove 12b Long groove 13 Horizontal motion mechanism 15 Horizontal link body 16 Top feed horizontal shaft 18 Top feed support portion 19 Connecting member 21 Compression spring

Claims (3)

In an upper feed device of a sewing machine that conveys the sewing product in a predetermined conveyance direction by driving the upper feed dog while pressing it on the upper surface of the sewing product,
A vertical motion mechanism having a vertical motion table and a vertical guide table for restricting the vertical motion table to move only in the vertical direction;
A horizontal motion table and a horizontal motion mechanism having a horizontal guide table for restricting the horizontal motion table to move only in the horizontal direction with respect to the sewing product,
A lower surface of the upper feed dog is disposed horizontally with respect to the sewing product, and the upper feed dog is fixedly connected to the vertical motion table or the horizontal motion table, and the vertical motion mechanism and the horizontal motion mechanism Are connected to each other, and the upper feed dog is moved elliptically by the cooperation of the vertical movement mechanism and the horizontal movement mechanism. Connecting the horizontal guide table to the lower end of the vertical motion table,
The upper feed device of the sewing machine according to claim 1, wherein the upper feed dog is connected to the horizontal motion table.   The upper feed device of the sewing machine according to claim 1 or 2, further comprising an elastic member that biases the upper feed dog in a placement direction of the sewing product.

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