JP2006255092A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a sewing efficiency by shortening a winding time of thread on a bobbin regardless of the feeding pitch of a cloth in the middle of sewing. <P>SOLUTION: The sewing machine 100 is provided with: a needle driving mechanism; a feeding mechanism; a presser; a thread winding apparatus 120; a feeding amount changing means; a change driving means 50 for driving the feeding amount changing operation of the feeding amount changing means; a storage means 92 storing driving information obtained by coordinating the feeding amount of the feeding mechanism with the highest restriction speed of the main shaft of a sewing machine motor 5 to the feeding amount; and a detection means 61 for detecting whether the presser rises. When the detection means 61 detects rising of the presser, the feeding amount control means 9 drive-controls feeding amount change operation of the change driving means 50 so that the feeding amount of the feeding mechanism may be zero, and a release means 9 releases restriction of the highest restriction speed of the main shaft of the sewing machine motor 5 in the driving information stored in the storage means 92. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine.

Conventionally, a main sewing machine has been provided with a needle drive mechanism for moving a sewing needle in which an upper thread is passed above a needle plate on which the cloth is placed, and a cloth on the needle plate is provided below the needle plate. A feed mechanism that feeds in the direction and a hook that houses a lower thread bobbin around which the lower thread is wound and entangles the upper thread with the lower thread are provided. The needle drive mechanism, feed mechanism, and shuttle are all configured to be driven in conjunction with the main shaft of the sewing machine motor, which is the drive source of the sewing machine. The feeding operation by the mechanism and the rotation speed of the hook increase. The feed pitch by the feed mechanism is changed by a stepping motor connected to the feed mechanism.
In such a main stitch sewing machine, the lower thread must be supplied manually, which hinders the automation of the sewing process. That is, in the case of the conventional sewing machine so far, when the bobbin thread wound around the bobbin thread bobbin disappears, the bobbin case and the bobbin thread bobbin are removed from the inner hook, and the bobbin thread bobbin is wound around the bobbin thread bobbin. It was necessary to perform the work such as re-mounting to the inner hook or replacing it with a bobbin bobbin that had been prepared in advance, and it took a lot of time and labor. .

In view of this, there has been proposed a thread winding device that can automatically wind a lower thread around a lower thread bobbin without attaching or detaching the lower thread bobbin (see, for example, Patent Document 1). This device has a take-up shaft that can be engaged and disengaged with respect to a center portion of a lower thread bobbin that is rotatably supported by an inner hook, and a thread end connected to a lower thread supply source by a predetermined thread guide member or the like. And engaging the take-up shaft with the lower thread bobbin, and then rotating the take-up shaft with the main shaft of the sewing machine motor, which is the drive source of the sewing machine, so that the lower thread bobbin is coupled with the main shaft of the sewing machine motor. Is rotated so that the yarn connected to the lower yarn supply source is wound around the lower yarn bobbin.
In addition, improvements have been made to the above technology to calculate the required amount of lower thread from the feed pitch, and the lower thread bobbin rotational speed is calculated from the calculated lower thread usage. There has also been proposed a technique in which an appropriate amount of lower thread is wound around a lower thread bobbin by rotating the thread bobbin (see, for example, Patent Document 2).
JP-A-1-91897 Japanese Patent Laid-Open No. 5-3984

  By the way, the yarn winding devices described in Patent Documents 1 and 2 have a configuration in which the mechanism is complicated and the cost increases because the lower yarn bobbin is automatically wound up without attaching or detaching the lower yarn bobbin. . Further, since the sewing cannot be performed when the lower thread is wound around the lower thread bobbin, it is necessary to shorten the time for winding the lower thread in order to improve the sewing efficiency. In order to shorten the time for winding the lower thread, the main shaft of the sewing machine motor may be rotated at a high speed. However, if the main shaft of the sewing machine motor is rotated at a high speed, the feed mechanism is driven at a high speed in conjunction with the main shaft. The stepping motor will step out due to a large load. If the feed pitch is too large, the inertial force may be increased and contact the needle plate. For this reason, there is a limit on the rotational speed of the main shaft according to the feed pitch, but when the lower thread bobbin has no lower thread when the cloth feed pitch is relatively large, Since the rotational speed of the main shaft of the sewing machine motor is slow, it takes time to wind the lower thread.

  Accordingly, the present invention has been made to solve the above-described problem, and a sewing machine capable of improving the sewing efficiency by shortening the winding time of the bobbin thread regardless of the feed pitch of the cloth being sewn. The purpose is to provide.

  In order to solve the above-described problems, a first aspect of the present invention is a sewing machine that has a needle driving mechanism that moves a sewing needle up and down in conjunction with driving of a main shaft of a sewing machine motor that is a driving source of the sewing machine. A feed mechanism that feeds and feeds the sewing product in a predetermined direction by appearing on the upper surface of the needle plate on which the sewing machine is placed, and feeding the sewing product in synchronization with the needle drive mechanism; The sewing machine is provided so as to be able to reciprocate in the vertical movement direction of the sewing needle, and presses the sewing material placed on the needle plate from above when the sewing needle is lowered, and the thread drawn from the thread supply source to the spindle of the sewing machine motor A bobbin that winds around the bobbin by using the drive, a feed amount change means that can adjust the feed amount per cycle of the sewing needle in the feed mechanism, and a feed amount change of the feed amount change means Change drive to drive motion Storage means for storing drive information in which the speed, the feed amount of the feed mechanism and the maximum speed limit of the main shaft of the sewing machine motor with respect to the feed amount are associated, and detection means for detecting whether or not the presser is raised A feed amount control means for performing drive control of a feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero when the detection means detects an increase in the presser; and the detection And a release means for releasing the restriction on the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means when the means detects the rise of the presser.

According to the first aspect of the present invention, when the yarn is wound around the bobbin, the presser is raised. However, when the detecting means detects the rise of the presser, the feed amount control means causes the feed amount of the feed mechanism to be zero. The drive control of the feed amount changing operation of the change driving means is performed so that When the detection means detects the presser foot rise, the release means releases the restriction on the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means. As a result, the rotational speed of the main shaft of the sewing machine motor does not depend on the feed pitch, and when the yarn is wound around the bobbin, it can be rotated to the maximum rotational speed of the main shaft. Further, since the feed amount becomes zero, even if the main shaft of the sewing machine motor is rotated at a high speed, the feed dog does not contact the needle plate due to the inertial force.
Therefore, regardless of the feed pitch of the cloth being sewn, the bobbin thread winding time can be shortened to improve the sewing efficiency.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect of the invention, when the detection means detects the rise of the presser, the feed amount of the feed mechanism becomes zero by the feed amount control means. A release mode for performing drive control of the feed amount changing operation of the change drive means and releasing the restriction of the maximum speed limit of the spindle of the sewing machine motor by the release means, and maintaining the feed amount of the feed mechanism and the sewing machine motor And a maintenance mode for maintaining the maximum speed limit of the main shaft of the main shaft.

  According to the second aspect of the present invention, since it is possible to switch between the release mode and the maintenance mode using the switching means, it is only necessary to enter the release mode in the sewing where the thread is wound around the bobbin. It can be a sewing machine.

  According to a third aspect of the present invention, in the sewing machine according to the first or second aspect, the sewing machine includes a needle swing driving device that swings a needle bar that holds the sewing needle with a predetermined swing width, and the detection means is the presser. When a rise in the position is detected, a needle swing stop means for stopping the driving of the needle swing drive device is provided.

  According to the third aspect of the present invention, when the detecting means detects an increase in the presser, that is, when a thread is wound around the bobbin, the cloth on the needle plate is not pressed by the presser and sewing is performed. However, in such a case, the needle swing stop means stops driving the needle swing drive device, so it is not necessary to stop the needle swing by a separate operation, and the time and effort required for the user can be reduced. .

  According to a fourth aspect of the present invention, in the sewing machine according to the third aspect, a needle swing stop mode in which the needle swing driving device is stopped by the needle swing stop means when the detecting means detects an increase in the presser. And a needle swinging switching unit that can be switched to a needle swinging maintenance mode for maintaining the driving of the needle swinging driving device.

  According to the fourth aspect of the present invention, since it is possible to switch between the needle swing stop mode and the needle swing maintenance mode using the needle swing switching means, the needle swing stop mode is switched to only in the sewing where the thread is wound around the bobbin. Therefore, the sewing machine can be made easy to use.

  According to a fifth aspect of the present invention, there is provided a needle driving mechanism for moving a sewing needle up and down in conjunction with driving of a main shaft of a sewing machine motor serving as a driving source of the sewing machine, and a needle plate on which a sewing product is placed. A feed mechanism that feeds and feeds the sewing product in a predetermined direction by appearing from the upper surface, and a feed mechanism that feeds the sewing product in synchronization with the needle drive mechanism; and a vertical movement direction of the sewing needle The bobbin is provided so as to be reciprocally movable and presses the sewing material placed on the throat plate upward when it is lowered, and the thread drawn from the thread supply source is driven to the spindle of the sewing machine motor. A thread winding device for winding, a feed amount changing means capable of adjusting a feed amount per cycle of the vertical movement of the sewing needle in the feed mechanism, and a change driving means for driving a feed amount changing operation of the feed amount changing means And feed of the feed mechanism And a storage means for storing drive information that associates the maximum speed limit of the spindle of the sewing machine motor with respect to the feed amount, and a thread winding instruction for inputting an instruction to wind a thread around a bobbin by the thread winding device. A feed amount control means for performing drive control of a feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero when an instruction is input from the input means and the yarn winding instruction input means; Release means for releasing the restriction on the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means when an instruction is input from the thread winding instruction input means. .

According to the fifth aspect of the present invention, the user inputs an instruction from the thread winding instruction input means when winding the thread around the bobbin. When an instruction input is made from the thread winding instruction input means, the feed amount control means performs drive control of the feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero. Further, the release means releases the restriction on the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means. As a result, the rotational speed of the main shaft of the sewing machine motor does not depend on the feed pitch, and when the yarn is wound around the bobbin, it can be rotated to the maximum rotational speed of the main shaft. Further, since the feed amount becomes zero, even if the main shaft of the sewing machine motor is rotated at a high speed, the feed dog does not contact the needle plate due to the inertial force.
Therefore, regardless of the feed pitch of the cloth being sewn, the bobbin thread winding time can be shortened to improve the sewing efficiency.

  According to the first aspect of the present invention, it is possible to improve the sewing efficiency by reducing the winding time of the bobbin thread regardless of the feed pitch of the cloth being sewn.

  According to the second aspect of the present invention, since it is only necessary to set the release mode only in the sewing in which the bobbin is wound with the thread, the sewing machine can be made easy to use.

  According to the third aspect of the present invention, it is not necessary to stop the swinging of the needle by a separate operation, and it is possible to reduce time and effort for the user.

  According to the fourth aspect of the present invention, since the needle swing stop mode only needs to be set in the sewing where the thread is wound around the bobbin, the sewing machine can be made easy to use.

  According to the fifth aspect of the present invention, it is possible to improve the sewing efficiency by reducing the winding time of the bobbin thread regardless of the feed pitch of the cloth being sewn.

Hereinafter, the best mode of a sewing machine according to the present invention will be described in detail with reference to the drawings.
<Configuration of sewing machine>
As shown in FIGS. 1 to 8, the sewing machine 100 is placed on a sewing machine table Z and has a bed portion 1 (shown by a broken line) provided with a needle plate on the upper surface, and a bed above the bed portion 1. An arm portion 2 extending substantially parallel to the portion 1, a trunk portion standing on one end portion side of the bed portion 1 to support one end portion of the arm portion 2, and extending downward from a front end portion of the arm portion 2 The needle bar 3 that can move up and down and the upper shaft 4 (see FIG. 3) as a main shaft are rotationally driven, and the needle bar 3 and the needle bar 3 are driven by the rotational motor force of the sewing machine 100 and the rotational driving force of the upper shaft 4. The needle bar driving device 6 as a needle driving mechanism that moves the sewing needle 3a held by the needle bar 3 up and down, and the sewing is performed in a direction orthogonal to the feed direction of the cloth (sewing object) in synchronization with the vertical movement of the sewing needle 3a. A needle swing drive device for swinging the needle bar 3 with a predetermined swing width in order to perform a needle swing operation for moving the needle 3a. A feed drive device 8 that feeds the cloth placed on the bed 1 in synchronization with the needle bar drive device 6, a control device 9 that integrally controls the overall operation of the sewing machine, and a sewing machine motor depending on the amount of depression. A sewing pattern by inputting a plurality of various data such as an operation pedal 10 for adjusting the rotation speed 5 and a needle movement amount by which the needle swing driving device 7 moves the sewing needle 3a and a cloth feed amount by which the feed driving device 8 feeds the cloth. The operation panel 11 and the like having various switches for performing setting input and a display unit 11a for displaying set data and the like are provided.

  In this sewing machine 100, the sewing needle 3a attached to the tip of the needle bar 3 is moved up and down by the sewing machine motor 5 while the cloth is fed in a predetermined direction (front-rear direction) by the feed driving device 8, so that the seam is formed on the cloth. Is to be applied. The needle swing driving device 7 is a sewing machine that can perform zigzag stitching by moving the sewing needle 3a attached to the tip of the needle bar 3 in a direction (left-right direction) perpendicular to the direction in which the cloth is fed. .

(Sewing needle, needle bar drive, needle swing drive)
As shown in FIGS. 2 and 3, the sewing needle 3a is provided at the lower end of the needle bar 3, and the needle bar 3 supports the cam mechanism 12 and the needle bar 3 attached to the upper shaft 4 in the vicinity of the upper end. The movable body 3b is connected and supported. The sewing needle 3 a is reciprocated in the vertical direction via the needle bar 3. That is, the needle bar driving device 6 converts the rotational driving force of the upper shaft 4 into a driving force in the reciprocating vertical direction by the cam mechanism 12, and applies the reciprocating vertical moving force to the moving body 3 b that supports the needle bar 3. Is going. Further, the moving body 3b supports the needle bar 3 so as to be swingable about the left-right direction.
As shown in FIG. 4, the needle swing driving device 7 includes a needle swing pulse motor 71, and applies a swinging force to the needle bar 3 supported by the moving body 3 b via the link body 73 to move the needle swing up and down. The needle swing is executed at a predetermined timing with respect to the needle bar 3 to be performed. The needle swinging direction is orthogonal to the cloth feed direction, and the sewing direction can be arbitrarily set by combining the cloth feed and the needle swing. Thereby, a sewing pattern can be formed by a predetermined needle swing. Further, the needle swing driving device 7 is provided with a needle swing pulse motor origin sensor 71a that detects a shielding plate 71b that rotates with the rotation of the needle swing pulse motor 71 so that the origin of the needle swing position is detected. It has become.

(Cloth presser)
As shown in FIGS. 2 and 3, the arm portion 2 is provided so as to be capable of reciprocating along the vertical movement direction of the sewing needle 3, and a cloth placed on the needle plate 16 (see FIG. 8) when lowered. A cloth presser 17 is provided as a presser for pressing from above. The cloth presser 17 is provided at the lower end portion of the presser support 18 disposed substantially parallel to the vertical movement direction of the needle bar 3. A coil spring 19 as an urging member is passed through the upper end portion of the pressing support 18, and the pressing support 18 is urged upward. The cloth presser 17 can be moved up and down by a presser lever L provided on the surface of the arm portion 2.

(Winding device)
As shown in FIG. 2, a yarn winding device 120 is provided near the upper portion of the arm unit 2 to wind the yarn drawn from the yarn supply source around the lower yarn bobbin using the drive of the upper shaft 4 of the sewing machine motor 5. Yes.
As shown in FIGS. 5 and 6, the bobbin winding device 120 includes a base 123 that is detachably attached to the upper portion of the arm portion 2 with screws 121 and 122, and a shaft screw 124 that is rotated on the lower surface of the base 123. A rotating arm 125 that is freely attached, and a rotating shaft 126 that is rotatably fitted and held in a bearing portion 125 a formed at one end of the rotating arm 125 are provided. The rotary shaft 126 is inserted into a long hole 123a formed in the base 123 so as to have some play, and a lower thread bobbin B is inserted in a rotational direction in a portion protruding upward from the long hole 123a. A holding portion 126a is formed to be held so as to be locked, and a drive wheel 127 having an outer peripheral portion formed of an annular rubber is fixed to a portion protruding downward from the bearing portion 125a.

  In addition, a locking plate 128 that is rotatably supported by a shaft screw 124 is provided on the lower surface of the base 123, and the locking plate 128 is provided between the distal end portion and the base 123. The compression spring 129 is urged counterclockwise as viewed from above. A bobbin winding lever 131 is fixed to the upper end of a shaft 130 that is rotatably inserted into the base 123, and a rotating body 132 that rotates integrally with the bobbin winding lever 131 is attached to the lower end of the bobbin winding lever 131. ing. This rotating body 132 is formed with an engaging convex portion 132a, and this engaging convex portion 132a is always in contact with the locking plate 128, and a notch groove 128a formed in the locking plate 128 at a predetermined rotational position. It is designed to be fitted with. A compression spring 133 is interposed between the rotating arm 125 and the locking plate 128 so that rattling of the rotating arm 125 can be prevented.

  Further, a switch operating member 136 is fixed to the rotating body 132 by screws 134 and 135, and a pressing portion 136a protruding outward is formed on the switch operating member 136. Further, a micro switch 137 is fixed to the lower surface of the base 123, and when the bobbin winding lever 131 is in the initial position, the operating portion 137a is pressed by the pressing portion 136a of the switch operating member 136 to turn on, and a predetermined electrical signal Is turned OFF when the bobbin winding lever 131 is at the bobbin winding position.

  A flywheel 139 is fixed to the upper shaft 4 by a stop motion screw 138, and a cylindrical spring receiver 140 is slightly formed on the outer peripheral surface of a cylindrical boss 139a formed at the center of the flywheel 139. It is inserted to have a play of. A coil spring 141 is inserted in the gap between the inner peripheral surface of the spring receiver 140 and the outer peripheral surface of the boss 139a, and both ends of the coil spring 141 are locked by the spring receiver 140 and the boss 139a, respectively. Yes.

  A drive pulley 142 provided separately from the flywheel 139 and rotatably inserted into the upper shaft 4 is connected to the sewing machine motor 5 (see FIG. 1) via a timing belt 143. A cylindrical boss 142 a formed at the center of the drive pulley 142 is inserted into the coil spring 141 and is always in close contact with the coil spring 141. For this reason, when the driving pulley 142 is rotated by driving the sewing machine motor 5, the rotational force is transmitted to the flywheel 139 through the coil spring 141, and the upper shaft 4 rotates together with the flywheel 139.

  In addition, an electromagnetic solenoid 144 that moves up and down based on a control signal from the control device 9 is provided, and a locking member 145 that rotates about a shaft 145a according to the movement of the operating portion 144a of the electromagnetic solenoid 144 is provided. Is provided. When the actuating portion 144a is lowered, the actuating portion 144a rotates clockwise in FIG. 5, and a hook-like engaging portion 145b formed at the distal end thereof engages with an engaging protrusion 140a formed on the outer peripheral portion of the spring receiver 140. It is like that. When the engaging portion 145b engages with the engaging protrusion 140a and stops the rotation of the spring receiver 140, the diameter of the coil spring 141 inserted inside increases, and the boss 142a of the drive pulley 142 and Since the gap is generated between the upper shaft 4 and the drive pulley 142, the connection state between the upper shaft 4 and the drive pulley 142 is released, and even if the drive pulley 142 rotates, the rotational force is not transmitted to the upper shaft 4.

(Feed drive device)
The feed driving device 8 will be described with reference to FIGS. The feed driving device 8 has feed teeth 15 that protrude from the upper surface of the needle plate 16 on which the cloth is placed and feed the cloth in a predetermined direction, and the lower shaft 14 that rotates synchronously with the upper shaft 4 by the sewing machine motor 5. As a feed transmission mechanism 20 as a feed mechanism for transmitting the movement to the feed dog 15, and a feed amount changing means capable of changing and adjusting the feed amount of the feed dog 15 per one cycle of the vertical movement of the sewing needle 3a in the feed transmission mechanism 20. , A feed adjusting shaft 40 into which the square piece 30 is fitted, a cloth feed pulse motor 50 as a change driving means for driving the feed amount change adjusting operation of the feed dog 15, and the like. A driving force for the cloth feeding operation is applied to the feed dog 15 that performs the above-described operation, and the feed amount of the cloth fed by the feed dog 15 can be variably adjusted.

  FIG. 7 is a cross-sectional view of the bed portion 1 in the cross-section of the VII-VII portion of FIG. 1, and shows a state in which the inside of the bed portion 1 is viewed from the lower side in FIG. As shown in FIG. 4, a lower shaft 14 that is rotatable about an axial center extending in the left-right direction is attached in the bed portion 1. The lower shaft 14 is connected to the output shaft 5a (see FIG. 1) of the sewing machine motor 5 via a transmission mechanism such as a link mechanism or a belt mechanism (not shown). For this reason, when the sewing machine motor 5 is driven, the lower shaft 14 is also rotated via a transmission mechanism such as a link mechanism.

  At the left end portion of the lower shaft 14, a feed dog 15 that is disposed below the cloth presser 17 and is capable of protruding and retracting with respect to the needle plate 16 and for feeding the cloth is attached. A feed transmission mechanism 20 that transmits the rotational movement of the lower shaft 14 to the feed dog 15 and drives the feed dog 15 is attached to the right side (body side) of the lower shaft 14.

  FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 and shows a state in which the upper side of the bed portion 1 is arranged on the upper side of the drawing. The feed transmission mechanism 20 includes a horizontal feed cam 21, a horizontal feed rod 22, a horizontal feed connecting rod 23, a horizontal feed arm 24, a horizontal feed shaft 25, a feed base arm 26, a feed base 27, a vertical feed link 28, and the like. .

  The horizontal feed cam 21 has an eccentric cam that is eccentric with respect to the lower shaft 14, and this eccentric cam is connected to the upper end portion of the horizontal feed rod 22 through a bearing so as to be rotatable. The lower end portion of the horizontal feed rod 22 is rotatably connected to the front and rear intermediate portions of the horizontal feed connecting rod 23.

  The rear end of the horizontal feed connecting rod 23 is rotatably connected to the lower end of the horizontal feed arm 24. The upper end of the horizontal feed arm 24 is fixed to the right end of the horizontal feed shaft 25. The horizontal feed shaft 25 is attached to the bed 1 in a state of being rotatable around a horizontal axis, and the left end of the horizontal feed shaft 25 is connected to the lower end of the feed arm 26. It is fixed. The upper end of the feed base arm 26 is rotatably connected to the rear end of the feed base 27.

  A feed dog 15 is fixed on the feed base 27. The front end of the feed base 27 is rotatably connected to the upper end of the vertical feed link 28. The lower end of the vertical feed link 28 is rotatably connected via an eccentric cam 28a provided at the left end of the lower shaft 14. On the other hand, a square piece 30 is connected to the front end of the horizontal feed connecting rod 23.

  The square piece 30 is supported by the feed adjusting shaft 40 so as to be reciprocally swingable along a direction orthogonal to the left-right direction, and the movement locus of the feed dog 15 is changed by changing the direction of the swing. It fulfills the function of changing the feed amount. The square piece 30 is fitted in a groove 40 a formed in the left and right intermediate portion of the feed adjusting shaft 40, and the groove 40 a defines the swing direction of the square piece 30. The square piece 30 can swing within a certain range from a predetermined reference position in the groove 40a, and is configured not to come out of the groove 40a by a predetermined feed adjustment lid.

9 is a partial perspective view of the vicinity of the cloth feed pulse motor 50 provided in the bed portion 1 shown in FIG. 7 when viewed from the direction of the arrow IX. It shows the state of being placed in. The feed adjusting shaft 40 is attached to the bed portion 1 so as to be rotatable about an axis in the left-right direction. The upper end portion of the first feed adjustment link 41 is fixed to the right end portion of the feed adjustment shaft 40. The lower end portion of the first feed adjustment link 41 is rotatably connected to the front end portion of the second feed adjustment link 42. The rear end portion of the second feed adjustment link 42 is rotatably connected to the upper end portion of the third feed adjustment link 43. The lower end portion of the third feed adjustment link 43 is fixed to the output shaft 51 of the cloth feed pulse motor 50.
The cloth feed pulse motor 50 is provided with a cloth feed pulse motor origin sensor 50a (see FIG. 10) for detecting the rotation of the cloth feed pulse motor 50 so that the origin of the cloth feed position is detected. It has become.

(Mechanical operation of the sewing machine)
Next, the mechanical operation of the sewing machine will be described. When the lower shaft 14 is rotated by depressing the operating pedal 10 of the sewing machine and driving the sewing machine motor 5, the rotational movement of the lower shaft 14 causes the horizontal feed cam 21, the horizontal feed rod 22, the horizontal feed connecting rod 23 and the horizontal feed. It is transmitted to the horizontal feed shaft 25 via the arm 24, and the horizontal feed shaft 25 performs reciprocating rotational movement. Then, the reciprocating motion of the horizontal feed shaft 25 is transmitted to the feed dog 15 via the feed base arm 26 and the feed base 27, and the reciprocating motion of the feed dog 15 in the front-rear direction is realized.
On the other hand, the rotational movement of the lower shaft 14 is transmitted to the feed base 27 via the vertical feed link 28, whereby the vertical reciprocation of the feed dog 15 fixed on the feed base 27 is realized.
As a result, the feed dog 15 performs a circular or elliptical motion by combining a reciprocating motion in the front-rear direction and a reciprocating motion in the up-down direction, thereby feeding the cloth pressed from above by the cloth presser 17 in a predetermined direction. Do exercise.

When the feed dog 15 performs a circular or elliptical movement so as to move from front to back in FIG. 8 while protruding upward from the needle plate 16, the cloth pressed by the cloth presser 17 is fed forward. The On the other hand, if the circular or elliptical movement is performed so that the feed dog 15 moves backward and forward in FIG. 8 while the feed dog 15 protrudes upward from the needle plate 16, the cloth pressed by the cloth presser 17 is reversely fed. The
The forward feed and the reverse feed of the feed dog 15 are converted by changing the rotation phase of the horizontal feed shaft 25 with respect to the rotation phase of the lower shaft 14, but the rotation phase of the lower shaft 14 and the rotation of the horizontal feed shaft 25 are changed. The change of the dynamic phase is realized by changing the inclination angle of the square piece 30 (the rotation angle with respect to a predetermined reference position). That is, when the square piece 30 performs a reciprocating rocking motion, the longitudinal component of the rocking motion is transmitted to the feed dog 15. Therefore, when the square piece 30 rotates in the A direction from the initial position shown in FIG. 5, the feed dog 15 performs a forward feed movement, and the square piece 30 moves in the B direction from the initial position shown in FIG. In the case of rotation, the feed dog 15 performs reverse feed movement. In addition, when the square piece 30 reciprocally swings in the vertical direction at these intermediate positions, the forward / backward direction component becomes zero, and no feed is performed.

  In addition, the feed locus 15 has a circular or elliptical motion locus as described above, regardless of whether the feed dog 15 forward feeds or reverse feeds. Is changed. That is, by changing the range of the rotation angle of the feed base arm 26 with the horizontal feed shaft 25 per rotation of the lower shaft 14 as a fulcrum, the diameter in the front-rear direction in the movement locus of the feed base 27 and the feed dog 15 is changed. As a result, the feed amount is changed. Specifically, the forward / reverse feed amount per rotation of the lower shaft 14 increases as the rotation angle of the square piece 30 increases.

As described above, the feed direction and feed amount of the feed dog 15 can be changed by changing the inclination angle of the square piece 30 (rotation angle from a predetermined reference position). The inclination angle of the square piece 30 is changed by the cloth feed pulse motor 50.
That is, when the cloth feed pulse motor 50 shown in FIG. 9 is operated and the output shaft 51 is rotated clockwise in FIG. 9, the third, second, and first feed adjustment links 43, 42, 41 are sequentially passed. Thus, the feed adjusting shaft 40 rotates in the A direction. On the other hand, when the output shaft 51 rotates counterclockwise, the feed adjustment shaft 40 rotates in the B direction via the third, second, and first feed adjustment links 43, 42, and 41 sequentially. In this way, the cloth feed pulse motor 50 rotates the feed adjustment shaft 40 via the third, second and first feed adjustment links 43, 42 and 41, thereby changing the inclination angle of the square piece 30. Thus, the feed direction and feed amount of the feed dog 15 can be changed.

(Sewing machine control system)
A control unit of the sewing machine 100 will be described. FIG. 10 is a block diagram showing a control system of the sewing machine.
As shown in FIG. 10, the control device 9 includes a CPU 91 that executes each process in accordance with a process program related to operation control of the sewing machine 100, and a processing program and process data for executing each process. A ROM 92 serving as storage means for storing drive information in which the feed amount of 15 and the speed limit of the upper shaft 4 of the sewing machine motor 5 with respect to the feed amount are associated, various work memories, counters, and the like are provided. And a RAM 93 used as the above.

The ROM 92 stores a sewing program for performing sewing based on the sewing data.
Further, the ROM 92 has a square piece 30 and a feed adjustment shaft so that the feed amount of the feed dog 15 of the feed transmission mechanism 20 becomes zero when the presser lift sensor 61 (described later) detects the lift of the cloth presser 17. A feed amount control program for adjusting 40 is stored.
Further, the ROM 92 cancels the restriction on the maximum speed limit of the upper shaft 4 of the sewing machine motor 5 in the drive information stored in the ROM 92 when the presser lift sensor 61 (described later) detects the lift of the cloth presser 17. A cancellation program or the like is stored.
That is, the control device 9 functions as a feed amount control means when the CPU 91 executes a feed amount control program stored in the ROM 92.
In addition, the control device 9 functions as a release unit when the CPU 91 executes a release program stored in the ROM 92.

  The control device 9 includes a sewing motor 5, an encoder 72 for detecting the rotation speed thereof, a synchronizer 73 for detecting the position of the sewing needle 3 a, and a feed amount setting operation and an adjustment operation of the feed driving device 8 via an input interface. The cloth feed pulse motor 50 to be performed, the cloth feed pulse motor origin sensor 50a to detect the rotational position of the cloth feed pulse motor 50, the needle swing pulse motor 71 to perform needle swing, and the rotational position of the needle swing pulse motor 71 are determined. Needle swing pulse motor origin sensor 71a to be detected, operation pedal 10 for adjusting the rotational speed of the sewing machine motor 5, operation panel 11 for inputting various settings, and presser raising sensor 61 for detecting whether or not the cloth presser 17 has been raised. Etc. are connected.

The operation pedal 10 outputs a signal corresponding to the amount of depression, and the CPU 91 rotates the sewing machine motor 5 at a rotation speed corresponding to the signal output. The sewing machine motor 5 is connected to the control device 9 via its power supply output circuit, and the rotational speed is controlled by controlling the drive current value.
The cloth feed pulse motor 50 is driven and controlled by the CPU 91 in synchronism with a predetermined timing with respect to the needle drop timing recognized from the output of the encoder 72 so that the feed direction and the feed amount of the feed dog 15 are changed. It has become.
The needle swing pulse motor 71 is driven and controlled by the CPU 91 at a predetermined timing with respect to the needle drop timing recognized from the output of the encoder 72, and positions the sewing needle 3a at a predetermined needle drop position by the needle swing. .

As shown in FIG. 10, the operation panel 11 includes setting input switches for various setting data relating to sewing, as well as a needle number switch 111 for setting the number of stitches and a needle bar 3 for forming a desired sewing pattern. The needle swing setting switch 112 for inputting the needle movement amount of the needle swing in the left and right direction, the cloth feed setting switch 113 for inputting the cloth feed amount to which the feed dog 15 feeds the cloth, and the set sewing pattern are stored and registered. A registration switch 114 and a display mode switching switch 115 for switching the display mode of the registered sewing pattern are provided. The operation panel 11 is a so-called touch panel, and includes a display unit 11a that displays various input switches and displays the shape of the registered sewing pattern.
The presser raising sensor 61 is constituted by, for example, a proximity sensor, is provided in the arm portion 2, and is provided in the vicinity of the vertical movement path of the presser support 18 that can detect the vertical movement of the presser support 18. Yes.

<Control of feed amount when winding the thread>
Next, the control of the feed amount when winding the yarn around the bobbin will be described.
As shown in FIG. 11, during sewing, the CPU 91 of the control device 9 determines whether or not the presser raising sensor 61 detects the rise of the cloth presser 17 (step S <b> 1). Here, when the CPU 91 determines that the presser raising sensor 61 has detected the rise of the cloth presser 17 (step S1: YES), the CPU 91 executes the feed amount control program to thereby feed the feed dog of the feed transmission mechanism 20. The square piece 30 and the feed adjusting shaft 40 are adjusted so that the feed amount of 15 becomes zero (step S2). On the other hand, when the CPU 91 determines that the presser raising sensor 61 has not detected the rise of the cloth presser 17 (step S1: NO), the CPU 91 repeats this process.

Next, the CPU 91 makes the feed amount of the feed dog 15 of the feed transmission mechanism 20 zero, and then executes the release program, so that the maximum speed limit of the upper shaft 4 of the sewing machine motor 5 in the drive information stored in the ROM 92 is obtained. The restriction is released (step S3).
Next, the CPU 91 determines whether or not the operation pedal 10 has been depressed (step S4). If the CPU 91 determines that the operation pedal 10 has been depressed (step S4: YES), the CPU 91 winds the bobbin attached to the bobbin winding device (step S5). On the other hand, when the CPU 91 determines that the operation pedal 10 is not depressed (step S4: NO), the CPU 91 repeats this process.
During the bobbin winding, the CPU 91 determines whether or not the operation pedal 10 is released (step S6). Here, when the CPU 91 determines that the depression of the operation pedal 10 has been released (step S6: YES), the CPU 91 stops the sewing machine motor 5 (step S7), and this process is terminated. On the other hand, when the CPU 91 determines that the operation pedal 10 is not released (step S6: NO), the CPU 91 repeats this process.

<Effect>
According to the sewing machine 100 in the embodiment, when the yarn is wound around the bobbin, the cloth presser 17 is raised, but when the presser raising sensor 61 detects the rise of the cloth presser 17, the CPU 91 executes a feed amount control program. Thus, the square piece 30 and the feed adjusting shaft 40 are adjusted so that the feed amount of the feed dog 15 of the feed transmission mechanism 20 becomes zero. When the presser lift sensor 61 detects the lift of the cloth presser 17, the CPU 91 executes a cancel program to cancel the restriction on the maximum speed limit of the upper shaft 4 of the sewing machine motor 5 in the drive information stored in the ROM 92. . As a result, the rotational speed of the upper shaft 4 of the sewing machine motor 5 does not depend on the feed pitch, and can be rotated to the maximum rotational speed of the upper shaft 4 when a thread is wound around the bobbin. Further, since the feed amount becomes zero, even if the upper shaft 4 of the sewing machine motor 5 is rotated at a high speed, the feed dog 15 is not greatly shaken by the inertia force and the throat plate 16 does not contact.
Therefore, regardless of the feed pitch of the cloth being sewn, the bobbin thread winding time can be shortened to improve the sewing efficiency.

  The present invention is not limited to the above embodiment. For example, when the presser lift sensor 61 detects the lift of the cloth presser 17, the control unit 9 adjusts the square piece 30 and the feed adjustment shaft 40 so that the feed amount of the feed dog 15 of the feed transmission mechanism 20 becomes zero. Even when the release mode for releasing the restriction of the maximum speed limit of the upper shaft 4 of the sewing machine motor 5 in the drive information stored in the ROM 92 and when the presser raising sensor 61 detects the rise of the cloth presser 17, A maintenance mode for maintaining the feed amount and the maximum speed limit may be provided, and the mode may be freely switched by a mode switch as a switching unit. By adopting such a configuration, it is only necessary to set the release mode only in the sewing where the thread is wound around the bobbin, so that the sewing machine can be made easy to use.

Further, when the presser raising sensor 61 detects the rise of the cloth presser 17, a needle swing stop program as a needle swing stop means for stopping the driving of the needle swing drive device 7 is stored in the ROM 92, and the yarn is stored in the bobbin. You may make it stop a needle swing when winding. By adopting such a configuration, it is not necessary to stop the needle swing by a separate operation, and it is possible to reduce time and effort for the user.
In the case of such a configuration, the control device 9 adjusts the square piece 30 and the feed adjusting shaft 40 so that the feed amount of the feed dog 15 of the feed transmission mechanism 20 becomes zero, and the drive information stored in the ROM 92. A release mode for releasing the restriction of the speed limit of the upper shaft 4 of the sewing machine motor 5 and a maintenance mode for maintaining the feed amount and the speed limit even when the presser raising sensor 61 detects the rise of the cloth presser 17. And may be freely switchable by a mode switch as a needle swing switching means. By adopting such a configuration, it is only necessary to set the release mode only in the sewing where the thread is wound around the bobbin, so that the sewing machine can be made easy to use.

In addition, a drive prohibition program that prohibits driving such as wiper, thread trimming, and thread feeding may be stored in the ROM 92, and the drive of each drive mechanism may be prohibited when winding the thread around the bobbin. By adopting such a configuration, it is not necessary to prohibit the driving mechanism that operates in conjunction with the driving of the main shaft of the sewing machine motor by a separate operation, and it is possible to reduce time and effort for the user.
In the case of such a configuration, the control device 9 adjusts the square piece 30 and the feed adjusting shaft 40 so that the feed amount of the feed dog 15 of the feed transmission mechanism 20 becomes zero, and the drive information stored in the ROM 92. A release mode for releasing the restriction of the speed limit of the upper shaft 4 of the sewing machine motor 5 and a maintenance mode for maintaining the feed amount and the speed limit even when the presser raising sensor 61 detects the rise of the cloth presser 17. And may be freely switchable by a mode switch as drive switching means. By adopting such a configuration, it is only necessary to set the release mode only in the sewing where the thread is wound around the bobbin, so that the sewing machine can be made easy to use.

  Further, a thread winding switch is provided as a thread winding instruction input means for inputting an instruction to wind a thread around a bobbin by a thread winding device by a user, and when an instruction is input from the thread winding switch, the feed transmission mechanism 20 The square piece 30 and the feed adjustment shaft 40 are adjusted so that the feed amount of the teeth 15 becomes zero, and the restriction on the maximum speed limit of the upper shaft 4 of the sewing machine motor 5 in the drive information stored in the ROM 92 is released. It may be. Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.

It is the schematic for demonstrating the whole structure of a sewing machine. It is a perspective view of a bed part, an arm part, and a trunk part of a sewing machine. It is the schematic which shows the internal mechanism of the arm part seen from the III direction of FIG. It is explanatory drawing of a needle swing mechanism. It is a perspective view explaining the mechanism of a bobbin winder. It is a disassembled perspective view of a bobbin winding device. It is sectional drawing of the VII-VII part of FIG. It is sectional drawing of the VIII-VIII part of FIG. It is explanatory drawing for demonstrating the structure of the pulse motor for cloth feed of a feed drive device vicinity. It is a block diagram which shows the control system of a sewing machine. It is a flowchart which shows the control action at the time of performing bobbin winding.

Explanation of symbols

3 Needle bar 3a Sewing needle 6 Needle bar drive device (needle drive mechanism)
7 Needle swing drive device 8 Feed drive device (feed mechanism)
9 Control device (feed amount control means, release means, needle swing stop means)
17 Presser foot
30 square pieces (feed amount changing means)
40 Feed adjustment axis (feed amount changing means)
50 Cloth feed pulse motor (change drive means)
61 Presser lift sensor (detection means)
92 ROM (storage means)
100 sewing machine 120 thread winding device

Claims (5)

A needle drive mechanism that moves the sewing needle up and down in conjunction with the drive of the main shaft of the sewing machine motor that is the drive source of the sewing machine;
A feed mechanism that has a feed dog that protrudes and appears on the upper surface of a needle plate on which the workpiece is placed and feeds the workpiece in a predetermined direction, and that feeds the workpiece in synchronization with the needle drive mechanism When,
A presser which is provided so as to be reciprocally movable along the vertical movement direction of the sewing needle and presses the workpiece to be sewn placed on the needle plate when descending from above;
A thread winding device for winding a thread drawn from a thread supply source around a bobbin using the drive of the spindle of the sewing machine motor;
A feed amount changing means capable of adjusting a feed amount per one cycle of the vertical movement of the sewing needle in the feed mechanism;
Change driving means for driving the feed amount changing operation of the feed amount changing means;
Storage means for storing drive information in which the feed amount of the feed mechanism is associated with the maximum speed limit of the spindle of the sewing machine motor with respect to the feed amount;
Detecting means for detecting whether or not the presser is raised;
A feed amount control means for performing drive control of a feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero when the detection means detects the rise of the presser;
A release means for releasing the restriction of the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means when the detection means detects the rise of the presser;
A sewing machine comprising: When the detection means detects the rise of the presser,
The feed amount control means controls the feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero, and the release means releases the restriction on the maximum speed limit of the spindle of the sewing machine motor. 2. A switching means that can be switched between a release mode to perform and a maintenance mode that maintains a feed amount of the feed mechanism and maintains a maximum speed limit of the spindle of the sewing machine motor. The described sewing machine. A needle swing driving device for swinging a needle bar holding the sewing needle with a predetermined swing width;
The sewing machine according to claim 1 or 2, further comprising needle swinging stop means for stopping driving of the needle swing driving device when the detecting means detects an increase in the presser. When the detection means detects the rise of the presser,
A needle swing switching means switchable between a needle swing stop mode in which the needle swing drive device is stopped by the needle swing stop means and a needle swing maintenance mode in which the drive of the needle swing drive device is maintained. The sewing machine according to claim 3. A needle drive mechanism that moves the sewing needle up and down in conjunction with the drive of the main shaft of the sewing machine motor that is the drive source of the sewing machine;
A feed mechanism that has a feed dog that protrudes and appears on the upper surface of a needle plate on which the workpiece is placed and feeds the workpiece in a predetermined direction, and that feeds the workpiece in synchronization with the needle drive mechanism When,
A presser which is provided so as to be reciprocally movable along the vertical movement direction of the sewing needle and presses the workpiece to be sewn placed on the needle plate when descending from above;
A thread winding device for winding a thread drawn from a thread supply source around a bobbin using the drive of the spindle of the sewing machine motor;
A feed amount changing means capable of adjusting a feed amount per one cycle of the vertical movement of the sewing needle in the feed mechanism;
Change driving means for driving the feed amount changing operation of the feed amount changing means;
Storage means for storing drive information in which the feed amount of the feed mechanism is associated with the maximum speed limit of the spindle of the sewing machine motor with respect to the feed amount;
A thread winding instruction input means for inputting an instruction to wind a thread around a bobbin by the thread winding device;
A feed amount control means for performing drive control of a feed amount change operation of the change drive means so that the feed amount of the feed mechanism becomes zero when an instruction is input from the yarn winding instruction input means;
A release means for releasing the restriction on the maximum speed limit of the main shaft of the sewing machine motor in the drive information stored in the storage means when an instruction is input from the thread winding instruction input means;
A sewing machine comprising:

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