JP4999662B2 - Sewing machine cloth feed control device - Google Patents

Description

  The present invention relates to a cloth feed control device for a sewing machine, and more particularly to a cloth feed control device for a sewing machine capable of performing minute reverse feed of a cloth at the time of thread trimming.

  2. Description of the Related Art Conventionally, there is known a cloth feed control device for a sewing machine that can perform both forward and reverse feeds of a cloth performed by a feed dog of a sewing machine by controlling the feed pitch to be different (see, for example, Patent Document 1). ).

JP-A-4-303493

  However, since the invention described in the above-mentioned Patent Document 1 uses the two solenoids provided integrally together to perform the above-described minute cloth feed in both the forward and reverse directions, two solenoids are provided at one place. Because of the large space needed. Moreover, since it is necessary to use two solenoids simultaneously, there is a problem that the structure is complicated and lacks versatility.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cloth feed control device for a sewing machine that can save space with a simple structure and can also perform minute reverse feed of a cloth.

  In order to achieve the above-described object, the cloth feed control device for a sewing machine according to the present invention is characterized by a feed adjustment body supported so as to be able to advance and retreat along a horizontal direction, and rotatably supported by a machine frame, one end side of which is described above. A feed adjuster capable of abutting on the feed adjuster, a feed conversion shaft which is rotatably supported by the machine frame and sets a feed amount of the feed dog, and one end side thereof is rotatably supported by the feed adjuster; A sewing machine having a cloth feed control link whose other end is connected to the feed conversion shaft, and a forward / reverse switching solenoid which is connected to the other end of the cloth feed control link and moves the cloth feed control link. In the cloth feed control device, one end side is connected to the intermediate portion of the cloth feed control link, and the minute reverse feed link is connected to the other end side of the minute reverse feed link, and the cloth feed control link is connected to the cloth feed control link. Minute reverse feed that can move in the reverse feed direction A solenoid, is arranged to abut against a position capable in the minute for reverse feed link, in that it comprises a stopper for locking the linking the micro backward at a predetermined position.

  By adopting such a configuration, the minute reverse feed solenoid is driven to rotate the minute reverse feed link, and the cloth feed control link is moved until the minute reverse feed link comes into contact with the stopper. It can be set to move, rotate the feed adjuster, move the feed adjuster and feed the fabric in a slightly reverse direction.

  According to another aspect of the present invention, there is provided a sewing machine cloth feed control device including an auxiliary link that connects the minute reverse feed link and the cloth feed control link, and the auxiliary link and the minute reverse feed link. And at least one of the connecting part of the auxiliary link and the cloth feed control link is a connecting pin and a long hole formed along the moving direction of the cloth feed control link. The long hole has a predetermined length so that the movement of the cloth feed control link is not transmitted to the minute reverse feed link when the forward / reverse switching solenoid is driven.

  By adopting such a configuration, when the forward / reverse switching solenoid is driven to move the cloth feed control link, the connecting pin of the minute reverse feed link is relatively moved even by the movement of the long hole. Since it is in a stationary state so as to move in the long hole, the minute reverse feed link and the minute reverse feed solenoid remain stationary. Note that the same effect is obtained even when the long hole is stopped by moving the connecting pin.

  Further, another cloth feed control device for a sewing machine according to the present invention is characterized in that a spring member for urging the connecting pin toward the upper end side of the long hole is provided.

  By adopting such a configuration, the connecting pin is engaged with the upper end side of the long hole even if the feed adjusting body is advanced and retracted and the feed amount is adjusted. For this reason, when the solenoid for minute reverse feed is energized, the connecting pin raised by the minute reverse feed link immediately pushes up the connecting portion, so that the minute feeding of the cloth can be performed with good responsiveness.

  Furthermore, another cloth feed control device for a sewing machine according to the present invention is characterized by comprising an eccentric pin that is rotatably supported by the machine frame and whose eccentric portion abuts against the stopper, and rotates the eccentric pin. Thus, the position of the stopper can be adjusted.

  And by employ | adopting such a structure, the pitch in the case of fine reverse feed of a cloth can be adjusted by rotating an eccentric pin.

  According to the cloth feed control device for a sewing machine according to the present invention, it is possible to save space with a simple configuration, and it is also possible to perform minute reverse feed of the cloth.

  That is, according to the cloth feed control device for a sewing machine according to claim 1, one minute reverse feed solenoid can be driven to perform the minute reverse feed of the cloth, thereby saving space with a simple configuration. be able to.

  According to the cloth feed control device for the sewing machine according to claim 2, since the long hole allows the connecting pin to be stationary, it is possible to prevent an unnecessary load from acting on the minute reverse feed link and the minute reverse feed solenoid. can do.

  According to the cloth feed control device for the sewing machine according to the third aspect, since the connecting pin is urged toward the upper end side of the long hole by the spring member, the cloth can be finely fed with high responsiveness.

  According to the cloth feed control device for a sewing machine described in claim 4, the pitch at the time of the minute reverse feed of the cloth can be arbitrarily set.

  FIG. 1 shows a main part of a cloth feed control device for a sewing machine according to the present invention, and a feed adjuster 1 for controlling the cloth feed is rotatably supported by a support shaft 2. 2 is supported by a sewing machine frame (machine frame) (not shown). Behind the feed adjuster 1, a feed adjuster 3 that can be moved forward and backward is disposed so as to come into contact with the feed adjuster 1, and the feed adjuster 3 advances and retreats according to the inclined state of the feed adjuster 1. The cloth feed direction and feed pitch are set.

  In FIG. 1, the feed in the forward direction of the cloth is set with the feed adjuster 1 being lowered to the right, and the feed in the reverse direction of the cloth is set with the feed adjuster 1 being lowered to the left. It is like that. Further, the feed pitch is increased as the inclination of the feed adjuster 1 becomes steep.

  A pin 4 protrudes from the front end portion of the feed adjuster 1, and the upper end portion of the cloth feed control link 5 extending substantially up and down via the washer 4 </ b> A rotates on the pin 4. It is pivotally possible. At the upper part of the cloth feed control link 5, the upper end of the coil spring 6 in a tension state is screwed into a screw hole 5A formed in the cloth feed control link 5, and is held by a pin 7 held by a nut 5B. The coil spring 6 is locked and connected. The coil spring 6 extends obliquely downward, and the other end is locked to a sewing machine frame (not shown). Therefore, the cloth feed control link 5 is always biased obliquely downward by the coil spring 6. As a result, the cloth feed control link 5 takes the lowered position, holds the feed adjuster 1 in the right-down state, and sets a state in which the cloth is fed in the forward direction.

  A forward / reverse switching solenoid 9 fixed to the lower surface of the sewing machine frame 8 is disposed below the cloth feed control link 5. The forward / reverse switching solenoid 9 raises the cloth feed control link 5 set to feed the cloth in the forward direction by the coil spring 6 as described above, and the feed adjuster 1 is lowered to the left. It is for changing and setting the state which sends cloth in the reverse direction.

  The plunger 10 of the forward / reverse switching solenoid 9 retreats to the left in FIG. 1 when the solenoid 9 is energized, and a pin protruding laterally is formed on the outer peripheral surface of the plunger 10. 11 is protrudingly provided.

  In the vicinity of the cloth feed control link 5 and the plunger 10, a bell crank-shaped transmission link 12 for connecting the cloth feed control link 5 and the plunger 10 is supported by a sewing machine frame (not shown). It is pivotally attached to the supporting shaft 13 that is pivotable.

  A fork portion 14 is formed at the end of the transmission link 12 on the plunger 10 side, and the pin 11 of the plunger 10 is slidably fitted to the fork portion 14. Therefore, the transmission link 12 rotates as the plunger 10 moves.

  An end of the transmission link 12 on the cloth feed control link 5 side is pivotally connected to a lower end of the cloth feed control link 12 by a pin 15. When the solenoid 9 is energized, the plunger 10 retracts to the left in FIG. 1, the transmission link 12 rotates clockwise in FIG. 1, and the cloth feed control link 5 rises. As a result, the feed adjuster 1 that has been set to lower right so as to feed the cloth in the forward direction by being biased by the coil spring 6 is set to move leftward and to feed the cloth in the opposite direction.

  A feed conversion arm 71 is pivotally attached to the pin 15 at the lower end of the cloth feed control link 5 so that the feed conversion arm 71 is rotated as the cloth feed control link 5 is moved up and down. The feed conversion arm 71 holds a feed conversion shaft 70 that rotates together with the feed conversion arm 71. When the feed conversion shaft 70 is rotated, a feed dog (not shown) feeds the cloth at a desired pitch in either the forward or reverse direction according to the rotation.

  Near the upper end of the cloth feed control link 5, a minute reverse feed solenoid 20 fixed to a sewing machine frame (machine frame) (not shown) is disposed. The minute reverse feed solenoid 20 raises the cloth feed control link 5 which is set to feed the cloth in the forward direction by the coil spring 6 as described above, and moves the feed adjuster 1 to the normal reverse of the cloth. This is for changing the state to the left-lowering state of a small inclined state that reversely feeds at a pitch smaller than the feed, and setting the state in which the fabric is reversely fed back.

  When the solenoid 20 is energized, the plunger 21 of the minute reverse feed solenoid 20 retreats to the right in FIG. 1, and the plunger 21 has a pin protruding laterally on the outer peripheral surface. 22 is protrudingly provided.

  In the vicinity of the cloth feed control link 5 and the plunger 21, a bell crank-shaped minute reverse feed link 23 for indirectly connecting the cloth feed control link 5 and the plunger 21 is a sewing machine (not shown). It is pivotally attached to a support shaft 24 supported by the frame.

  2 to 4 to be described later are exploded perspective views as seen from the oblique rear side (the back side of the drawing) of FIG.

  As shown in detail in FIG. 2, a fork portion 25 is formed at the end of the minute reverse feed link 23 on the plunger 21 side, and a pin 22 of the plunger 21 is slidable on the fork portion 25. Is fitted. Therefore, when the plunger 21 moves, the minute reverse feed link 23 rotates with respect to the sewing machine frame (machine frame). The minute reverse feed link 23 is provided with a boss 27 projecting from the outer periphery of a hole 26 through which the support shaft 24 is inserted. 1, a coil spring 28 that is rotated clockwise is wound.

  At the end of the minute reverse feed link 23 on the cloth feed control link 5 side, a screw-like connecting pin 29 is screwed into a screw hole 23A via a spacer 23B and fixed by a nut 23C. Projected. The connecting pin 29 is inserted into the long hole 31 of the auxiliary link 30 having a long hole 31 formed in the upper portion, and can move relatively along the long hole 31. The longitudinal direction of the long hole 31 coincides with the moving direction of the cloth feed control link 5. That is, the long hole 31 is formed along the movement direction of the cloth feed control link 5. And these connection pins 29 and the long hole 31 comprise the connection part. A circular hole 32 is formed in the lower portion of the auxiliary link 30.

  In FIG. 1, a notch 33, which is shown in detail in FIG. 3, is formed on the left side surface of the center portion in the vertical direction of the cloth feed control link 5. In FIG.

  On the other hand, in the vicinity of the cloth feed control link 5, as shown in detail in FIG. 3, the cloth feed control link 5 is raised to manually rotate the feed adjuster 1 in the cloth reverse feed direction. For this purpose, a manual lever 35 whose intermediate portion is bent is disposed. A cylindrical portion 36 having a horizontal axis is formed at the base end portion of the manual lever 35. Further, a pushing portion 37 for manual operation is formed at the bent distal end portion of the manual lever 35.

  A hook 38 protrudes from the upper surface of the intermediate portion of the manual lever 35. The hook 38 is engaged with a sewing machine frame (not shown) to urge the manual lever 35 upward. The lower end of the coil spring 39 is locked. Further, a stopper 40 supported by a sewing machine frame (not shown) and restraining the upward movement of the manual lever 35 by the coil spring 39 is in contact with the upper surface of the intermediate portion of the manual lever 35. Further, a pin 41 projects from the upper part of the side surface of the intermediate portion of the manual lever 35.

  A cylindrical long support shaft 42 is inserted into the cylindrical portion 36 of the manual lever 35 so as to rotatably support the manual lever 35. At one end of the support shaft 42, a flat rectangular follower projection 43 is provided. A flat rectangular drive opening 45 formed in the drive plate 44 is fitted in the driven protrusion 43. The driving plate 44 is fixed to the support shaft 42 by the head of a screw 46 screwed to the tip of the follower projection 43.

  The drive plate 44 extends to below the pin 41 projecting from the manual lever 35, and the pin 41 is driven by pushing down the pushing portion 37 of the manual lever 35. The drive plate 44 is turned counterclockwise in FIG. 1 by pushing down the body 44.

  A drive arm 47 and a boss 47 </ b> A are fixed to the outer peripheral surface of the support shaft 42.

  The drive arm 47 has a generally U-shape, and has a circular hole 48 attached to the outer peripheral surface of the support shaft 42 and a slit 49 reaching one end from the circular hole 48. ing. The slit 49 is fitted to the support shaft 42 so as to be adjustable in the circumferential direction by a screw 50 screwed to the drive arm 47 so as to be orthogonal to the plane of the slit 49.

  The drive arm 47 is provided with a pin 51 projecting laterally at an end opposite to the slit 49. The pin 51 is inserted through the notch 33 formed in the cloth feed control link 5 and is fitted into the circular hole 32 formed in the auxiliary link 30. For this reason, the minute reverse feed link 23 is connected to the intermediate portion of the cloth feed control link 5 via the auxiliary link 30 and the pin 51.

  In the vicinity of the transmission link 23, as shown in detail in FIG. 4, by driving the minute reverse feed solenoid 20, the cloth feed control link 5 is raised to rotate the feed adjuster 1, In order to set the fine feed pitch of the cloth when the minute reverse feed is performed, a stopper 55 is provided which contacts the fine reverse feed link 23 and regulates the stroke of the cloth feed control link 5. Yes.

  The stopper 55 has an L shape in plan view, and a central portion in the longitudinal direction is fixed to a sewing machine frame (not shown) with a screw 56 via a washer 56A. The stopper 55 is formed with a notch 57 extending in the horizontal direction, and an eccentric portion 59 of an eccentric pin 58 is inserted into the notch 57 and is prevented from being removed by a washer 60. Further, the upper surface on the pin 29 side of the minute reverse feed link 23 can come into contact with the lower surface of the bent distal end portion of the stopper 55.

  Accordingly, the position of the eccentric portion 59 is changed by turning the eccentric pin 58 after the screw 56 is loosened so that the stopper 55 can be rotated, so that the eccentric portion 59 is notched. The inclined state of the stopper 55 can be changed by pressing the inner peripheral edge of 57. As a result, the stroke of the minute reverse feed link 23 until it contacts the stopper 55 can be changed.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  First, in a state where neither the forward / reverse switching solenoid 9 nor the minute reverse feed solenoid 20 is energized, the cloth feed control link 5 is biased obliquely downward by the coil spring 6 and maintains the lowered state. is doing. In this state, the feed adjuster 1 feeds the cloth in the forward direction. On the other hand, a feed dog (not shown) is set to feed the cloth in the forward direction by the feed conversion shaft 70.

  In such a state, when the cloth is fed in the reverse direction at the same pitch as that for sending the cloth in the forward direction, the forward / reverse switching solenoid 9 is energized. Then, in FIG. 1, the plunger 10 of the forward / reverse switching solenoid 9 moves backward to the left and the transmission link 12 rotates in the clockwise direction, so that the cloth feed control link 5 is raised. As a result, the feed adjuster 1 that has been in the lower right state becomes the lower left state, and the reverse feed state of the cloth is set. On the other hand, when the cloth feed control link 5 is raised, the feed conversion shaft 70 is also rotated, and the feed dog (not shown) is set to feed the cloth in the reverse direction.

  When the cloth feed control link 5 is raised, the pin 51 of the drive arm 47 is inserted into the notch 33 of the cloth feed control link 5, so that the drive arm 47 rotates counterclockwise in FIG. Will do. Then, the drive plate 44 is also rotated counterclockwise. However, when the drive plate 44 is rotated counterclockwise, the drive plate 44 is separated from the pin 41 of the manual lever 35. . Therefore, the manual lever 35 does not move, and unnecessary operation of the manual lever 35 can be prevented.

  Further, when the cloth feed control link 5 is raised due to the drive of the forward / reverse switching solenoid 9 (set in the cloth reverse feed direction), the connecting pin 29 protruding from the minute reverse feed link 23 is: The auxiliary link 31 is located in the vertically long slot 31. Therefore, even if the cloth feed control link 5 rises, it faces the lower part from the upper part of the long hole 31 of the auxiliary link 31 that rises together with the cloth feed control link 5. No load is applied to the minute reverse feed solenoid 20. Therefore, these minute reverse feed link 23 and minute reverse feed solenoid 20 are not adversely affected.

  When the energization of the forward / reverse switching solenoid 9 is released, the plunger 10 of the forward / reverse switching solenoid 9 projects rightward and the transmission link 12 rotates counterclockwise, thereby causing the cloth feed control link 5 to rotate. Is lowered by the bias of the coil spring 6. As a result, the feed adjuster 1 that has been in the lower left state becomes the lower right state, and the normal feed state of the cloth is set again. On the other hand, when the cloth feed control link 5 is lowered, the feed conversion shaft 70 is also rotated, and the feed dog (not shown) is reset so as to feed the cloth in the forward direction.

  In addition, when neither the forward / reverse switching solenoid 9 nor the minute reverse feed solenoid 20 is energized and the feed adjuster 1 feeds the cloth in the forward direction, when the cloth is fed minutely in the reverse direction, the minute reverse The energizing solenoid 20 is energized. As a result, the plunger 21 of the minute reverse feed solenoid 20 is retracted to the right in FIG. 1, and the minute reverse feed link 23 is rotated clockwise. Then, since the pin 29 of the minute reverse feed link 23 is inserted through the long hole 31 of the auxiliary link 30, the auxiliary link 30 is raised.

  Since the pin 51 of the drive arm 47 inserted through the notch 33 of the cloth feed control link 5 is fitted into the circular hole 32 below the auxiliary link 30, the pin 51 is connected to the auxiliary link 30. As a result, the pin 51 pushes up the upper edge of the notch 33 of the cloth feed control link 5.

  Accordingly, the cloth feed control link 5 is lifted, and the cloth feed control link 5 is lifted when the upper surface on the pin 29 side of the minute reverse feed link 23 comes into contact with the lower surface of the bent end portion of the stopper 55. Is stopped. As a result, the inclination state of the feed adjuster 1 changes, and the minute feed in the reverse direction of the cloth is set. On the other hand, as the cloth feed control link 5 is raised, the feed conversion shaft 70 is also rotated, and the feed dog (not shown) is set to feed the cloth in the reverse direction.

  When energization of the minute reverse feed solenoid 20 is released, the plunger 21 of the minute reverse feed solenoid 20 protrudes leftward and the minute reverse feed link 23 rotates counterclockwise, thereby controlling the cloth feed. The link 5 is lowered by the bias of the coil spring 6. As a result, the feed adjuster 1 that has been in the lower left state becomes the lower right state, and the normal feed state of the cloth is set again. On the other hand, when the cloth feed control link 5 is lowered, the feed conversion shaft 70 is also rotated, and the feed dog (not shown) is reset so as to feed the cloth in the forward direction.

  As described above, according to the cloth feed control device of the sewing machine of the present embodiment, the cloth reverse feed and the minute reverse feed are performed by the independent forward / reverse switching solenoid 9 and the minute reverse feed solenoid 20, respectively. Therefore, compared to the conventional case where two parallel solenoids may be used at the same time, the position where the solenoids 9 and 20 are installed can be selected widely, so it can be used for various sewing machines. Can be versatile. In addition, the configuration is simple and space saving can be achieved.

  Further, when the cloth feed control link 5 is raised using the forward / reverse switching solenoid 9 or the minute reverse feed solenoid 20, a long hole 31 is formed in the auxiliary link 30, and a driving plate body is formed. Since 44 rotates in a direction away from the pin 41 of the manual lever 35, no force is transmitted to each solenoid 9, 20 or manual lever 35 that is not used at this time, and each solenoid 9, 20 or manual lever 35 is not transmitted. Do not cause useless movement.

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

  For example, in the embodiment, it has been described that the long hole 31 is provided in the auxiliary link 30, but it may be formed directly in the cloth feed control link 5. In addition, the connecting portion between the auxiliary link 30 and the minute reverse feed link 23 or the connecting portion between the auxiliary link 30 and the cloth feed control link 5 is inserted into the connecting pin 29 and the connecting pin 29. You may make it provide the long hole 31 formed along the moving direction.

The front view which shows embodiment of the principal part of the cloth feed control apparatus of the sewing machine which concerns on this invention. FIG. 1 is an exploded perspective view of the details of the vicinity of the minute reverse feed link of FIG. The disassembled perspective view seen from diagonally backward of FIG. 1 which shows the structure of the vicinity of the cloth feed control link and manual lever of FIG. FIG. 1 is an exploded perspective view showing the configuration of the stopper of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feed adjuster 5 Cloth feed control link 6 Coil spring 8 Sewing frame 9 Forward / reverse switching solenoid 10 Plunger 12 Transmission link 20 Minute reverse feed solenoid 21 Plunger 23 Minute reverse feed link 29 Connecting pin 30 Auxiliary link 31 Long hole 32 Circular hole 33 Notch of cloth feed control link 5 Manual lever 41 Pin of manual lever 35 47 Drive arm 51 Pin 55 Stopper 58 Eccentric pin 70 Feed conversion shaft

Claims (4)

A feed adjustment body supported so as to freely advance and retract along the horizontal direction;
A feed adjuster that is rotatably supported by the machine frame and that can be in contact with the feed adjuster at one end side;
A feed conversion shaft that is rotatably supported by the machine frame and sets the feed amount of the feed dog,
A cloth feed control link having one end side rotatably supported by the feed adjuster and the other end side connected to the feed conversion shaft;
In a cloth feed control device for a sewing machine, which is connected to the other end of the cloth feed control link and has a forward / reverse switching solenoid for moving the cloth feed control link,
A minute reverse feed link having one end connected to an intermediate portion of the cloth feed control link;
A minute reverse feed solenoid connected to the other end side of the minute reverse feed link and capable of moving the cloth feed control link in the cloth reverse feed direction side;
A cloth feed control device for a sewing machine, comprising: a stopper disposed at a position capable of contacting the minute reverse feed link and locking the minute reverse feed link at a predetermined position. An auxiliary link connecting the minute reverse feed link and the cloth feed control link;
At least one of a connecting portion between the auxiliary link and the minute reverse feed link, and a connecting portion between the auxiliary link and the cloth feed control link,
A connecting pin; and a long hole formed along the direction of movement of the cloth feed control link into which the connecting pin is inserted. The sewing machine cloth feed control device according to claim 1, wherein the elongated hole has a predetermined length so as not to be transmitted to the minute reverse feed link. The cloth feed control device for a sewing machine according to claim 2, further comprising a spring member that urges the connecting pin toward the upper end side of the long hole. An eccentric pin that is rotatably supported by a machine frame and has an eccentric portion that abuts against the stopper, wherein the position of the stopper can be adjusted by rotating the eccentric pin. The sewing machine cloth feed control device according to any one of claims 1 to 3.

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