JP2006238905A - Sewing machine and feed adjusting mechanism of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to regulate and cancel the turnable range of an adjusting dial (an feed adjusting dial) in every operation to turn the adjusting dial (the feed adjusting dial) by every 360 degree when enlarging an adjusting the range of a cloth feed amount so as to be able to finely adjust the same by operating an adjusting dial (a feed adjusting dial) a plurality of times. <P>SOLUTION: A feed adjusting mechanism of a sewing machine is equipped with a turn regulating pin 53 for regulating the turn of a forward feed adjusting dial 35 at a position where the forward feed adjusting dial 35 arranged in the machine frame F of a zigzag stitch sewing machine turn a first about 360 degrees and a regulation cancel member 51 capable of canceling the turn regulation of the forward feed adjusting dial 35 by the turn regulating pin 53 for allowing the forward feed adjusting dial 35 to turn next 360 degree. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention makes it possible to regulate and release the rotation range of the adjustment dial (feed adjustment dial) each time the adjustment dial (feed adjustment dial) is rotated one rotation at a time. This relates to an apparatus capable of expanding the adjustment range for adjusting the cloth feed amount.

  Conventionally, industrial sewing machines and household sewing machines are provided with a feed adjustment mechanism that allows the cloth feed amount of the work cloth to be switched between forward feed and reverse feed, and that the cloth feed amount can be adjusted by rotating the feed adjustment dial. It has been.

  For example, the sewing machine described in Patent Document 1 includes a feed adjuster in which a forward feed surface and a reverse feed surface are formed in a V shape inside a sewing machine body, and a feed adjustment capable of coming into contact with a V-shaped cam surface. An operation dial having a screw at the tip is provided, and a feed changer that is connected to the feed adjuster via a linkage and generates a cloth feed amount by a feed dog is provided inside the bed. When the tilt of the feed adjuster is changed by rotating, the tilt of the feed changer is also changed by this change, and the cloth feed amount of the feed dog can be changed.

However, in this sewing machine, since the operation dial is provided with a restriction protrusion, when the operation dial is manually operated, the restriction protrusion comes into contact with the restriction portion on the machine body side, that is, the operation dial is rotated once. It can be rotated within the range. Therefore, the adjustment range of the cloth feed amount by the feed dog is limited to one rotation of the operation dial.
JP-A-6-292778 (page 3, FIG. 1)

  As described above, in the sewing machine disclosed in Patent Document 1, the operation amount of the operation dial that adjusts the cloth feed amount by manual rotation is limited to one rotation. In particular, in the staggered sewing machine, even if the operation amount of the operation dial is limited to one rotation as described above, the cloth feed amount can be changed from 0 to about 2.5 mm by one operation of the operation dial. Can cope with staggered stitches.

  However, when the zigzag stitch machine is used as a main stitch machine (straight stitch machine), a large cloth feed amount of 2 to 3 mm may be required. In this case, replace with a feed adjuster that can change the cloth feed amount from 0 to about 5 mm with one rotation of the operation dial, or greatly change the cloth feed amount from 0 to about 5 mm by one rotation of the operation dial. Since there is no choice but to use another zigzag sewing machine that can be used, there is a problem that the flexibility and adaptability of the cloth feed amount of one zigzag sewing machine is poor.

  In addition, the zigzag sewing machine that can change the feed amount greatly from 0 to about 5 mm by one rotation of the operation dial is more suitable than the zigzag stitch machine that can change the feed amount from 0 to about 2.5 mm. Since the rate of change of the cloth feed amount with respect to the rotation amount increases, there is a problem that fine adjustment of the cloth feed is difficult.

  The sewing machine according to claim 1 includes an adjustment dial provided in a machine frame of the sewing machine, and the adjustment dial is capable of adjusting a control amount of a control target according to an adjustment amount of the adjustment dial. The rotation restriction member that restricts the rotation of the adjustment dial at the rotated position and the rotation restriction member by the rotation restriction member can be released to allow the rotation of the adjustment dial for the next rotation. A deregulation member.

  When the adjustment dial provided on the machine frame of the sewing machine is manually rotated, the rotation range for the first approximately one rotation of the adjustment dial is restricted by the rotation restricting member. Entry into the rotation range is forcibly prevented. Therefore, the control amount to be controlled is adjusted within the control range corresponding to the adjustment amount for about the first rotation of the adjustment dial.

  However, if necessary, the adjustment amount by the adjustment dial can be switched to the rotation range for the next one rotation only by releasing the rotation restriction of the restriction release member by the restriction release member. In this case, the control amount to be controlled is adjusted within the control range corresponding to the adjustment amount for the next rotation of the feed adjustment dial.

  According to another aspect of the present invention, there is provided a feed adjustment mechanism for a sewing machine, a feed adjustment dial provided on a machine frame of the sewing machine, a feed adjuster whose rotation angle is adjusted according to an adjustment amount of the feed adjustment dial, and the feed adjuster. In a sewing machine feed adjustment mechanism having a feed changer that generates a cloth feed amount by a feed dog in accordance with the rotation angle of the feed adjustment dial, the feed adjustment dial is at a position where the feed adjustment dial is rotated about the first rotation. A rotation restricting member for restricting the rotation, and a restriction releasing member capable of releasing the rotation restriction of the feed adjusting dial by the rotation restricting member in order to permit the rotation of the feed adjusting dial for the next one rotation. It is provided.

  When the feed adjustment dial provided on the machine frame of the sewing machine is manually operated to rotate, the rotation range for the first rotation of the feed adjustment dial is restricted by the rotation restricting member. The entry into the rotation range for the rotation is forcibly prevented. Therefore, the rotation angle of the feed adjuster is adjusted based on the adjustment amount for about the first rotation of the feed adjustment dial, and the feed changer adjusts the feed adjustment dial according to the rotation angle of the feed adjuster. A cloth feed amount corresponding to the adjustment amount for the first rotation is generated.

  However, if necessary, the adjustment amount by the feed adjustment dial can be switched to the rotation range for the next one rotation only by releasing the rotation restriction of the restriction release member by the restriction release member. In this case, the feed changer generates a cloth feed amount corresponding to the adjustment amount for the next one rotation of the feed adjustment dial.

  According to a third aspect of the present invention, there is provided a mechanism for adjusting the feed of the sewing machine according to the second aspect of the invention. The release operation that is elastically urged by and the release operation for releasing the restriction so that the engagement between the engagement member engaging with the rotation restriction member and the engagement of the rotation restriction member via the engagement member can be released. Part.

  According to a fourth aspect of the present invention, there is provided a feed adjusting mechanism for the sewing machine according to the third aspect, wherein the release operation portion is integrally formed with the engaging member.

  According to a fifth aspect of the present invention, there is provided the sewing machine feed adjustment mechanism according to any one of the second to fourth aspects, wherein the restriction release member is provided close to the feed adjustment dial.

  According to the invention of claim 1, in the sewing machine provided with the adjustment dial and capable of adjusting the control amount of the control target according to the adjustment amount of the adjustment dial, the rotation restricting member and the restriction releasing member are provided. The rotation range for the first approximately one rotation of the adjustment dial is restricted by the rotation restricting member, and it is possible to forcibly prevent inadvertent entry into the rotation range for the next one rotation. Therefore, the control amount to be controlled can be adjusted within the control range corresponding to the adjustment amount for about the first rotation of the adjustment dial.

  However, if necessary, the adjustment amount by the adjustment dial can be switched to the rotation range for the next one rotation simply by releasing the rotation restriction of the restriction release member by the restriction release member. The adjustment can be made within the control range corresponding to the adjustment amount for the next rotation of the feed adjustment dial.

  According to the invention of claim 2, in the feed adjusting mechanism of the sewing machine provided with the feed adjusting dial, the feed adjuster, and the feed switching device, the rotation restricting member and the restriction releasing member are provided. The rotation range for the first approximately one rotation is restricted by the rotation restricting member, and it is possible to forcibly prevent inadvertent entry into the rotation range for the next one rotation. Therefore, the rotation angle of the feed adjuster is adjusted based on the adjustment amount for about the first rotation of the feed adjustment dial, and the feed changer adjusts the feed adjustment dial according to the rotation angle of the feed adjuster. The cloth feed amount according to the adjustment amount for the first rotation can be generated.

  However, if necessary, the adjustment amount by the feed adjustment dial can be switched to the rotation range for the next one rotation only by releasing the rotation restriction of the restriction release member by the restriction release member. The cloth feed amount corresponding to the adjustment amount for the next one rotation of the feed adjustment dial can be generated.

  According to the invention of claim 3, the rotation restricting member is elastically urged by the urging means so that the rotation restricting member can advance and retreat in the machine frame and the front end thereof can be brought into contact with the engaging portion of the feed adjusting dial. Has an engagement member that engages with the rotation restricting member, and a release operation part that releases the engagement of the rotation restricting member with the engagement part via the engagement member. The engagement between the rotation restricting member and the engaging portion of the feed adjustment dial can be easily released simply by releasing the release restricting member in the direction opposite to the biasing direction. .

  In addition, by providing the rotation restricting member in the machine casing, it is possible to reduce the size and improve the operability of the rotation restricting mechanism provided with the rotation restricting member and the restriction releasing member. Other effects similar to those of the second aspect are achieved.

  According to the invention of claim 4, since the release operation portion is integrally formed with the engaging member, only the downsizing of the rotation restriction mechanism provided with the rotation restriction member and the restriction release member is achieved by reducing the number of parts. In addition, it is possible to improve the assembly and reduce the cost. Other effects similar to those of the third aspect are achieved.

  According to a fifth aspect of the present invention, since the restriction release member is provided close to the feed adjustment dial, the operator can simultaneously operate the restriction release member while operating the feed adjustment dial with one hand. The operability of the member release operation can be improved. Other effects similar to those of any one of claims 2 to 4 are achieved.

  The staggered sewing machine of this embodiment extends not only the first feed adjustment cam surface but also the second feed adjustment cam surface to the cam portion of the feed adjuster with which the shaft member at the tip of the feed adjustment dial abuts. In addition to the first rotation of the feed adjustment dial and the rotation of the next one rotation, the adjustable fabric feed amount can be increased by a factor of approximately 2 and the feed adjustment dial can be rotated by one rotation. Each time the operation is performed, the rotation range of the feed adjustment dial can be restricted and released.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a staggered sewing machine M includes a bed portion 1, a pedestal portion 2 erected on the right side portion of the bed portion 1, and an upper portion of the pedestal portion 2 so as to face the bed portion 1. It has the arm part 3 extended to the left, and the head 4 provided in the left part of the arm part 3. The bed 1 is provided with a thread trimming mechanism (not shown), a rotary hook (not shown), and the like, and a bobbin around which a lower thread is wound is detachably mounted on the rotary hook.

  Although not shown, a main shaft that is driven by a sewing machine motor is provided inside the arm portion 3, and a needle bar driving mechanism (not shown) that drives the needle bar 5 up and down by the main shaft is provided on the head 4. A needle bar swinging mechanism (not shown) for swinging the needle bar 5 from side to side is provided. The pedestal 2 includes a forward feed adjustment dial 35 that adjusts the normal cloth feed amount for feeding the work cloth in the forward direction, and a reverse feed adjustment dial that adjusts the reverse cloth feed amount for feeding the work cloth in the reverse direction. 60 and a reverse stitching lever 64 for performing reverse stitching manually.

  Next, the feed dog driving mechanism 10 that drives the feed dog 14 in the front-rear direction (cloth feed direction) and drives the feed dog 14 in the vertical direction will be described. Here, a feed adjusting mechanism 30 described later is connected to the feed dog driving mechanism 10.

  As shown in FIGS. 2 and 3, the bed portion 1 is provided with a lower shaft 11 facing in the left-right direction rotatably supported by the machine frame F, and is predetermined by a sewing machine motor via a timing belt (not shown). Driven in the direction of rotation. The eccentric shaft 12 is fixed to the left end portion of the lower shaft 11, and the left end portion of the eccentric shaft 12 is connected to the feed base 15 of the feed dog 14 via the vertical movement link 13.

  On the other hand, on the rear side of the lower shaft 11, a swing shaft 16 parallel to the lower shaft 11 rotatably supported by the machine frame F is disposed, and the rear end portion of the feed base 15 is fixed to the swing shaft 16. The feed lever 17 is pivotally supported at the upper end. Therefore, when the lower shaft 11 is rotationally driven by the sewing machine motor, the horizontal swing is suppressed by the vertical movement link 13 among the vertical swing and the forward / backward swing of the eccentric shaft 12, so that the feed base 15 has a rear end. It is driven up and down using the part as a swing fulcrum.

  On the other hand, a feed changer 20 formed in a horizontal cylindrical shape is disposed on the front side of the lower shaft 11, and the feed changer 20 is slid into a curved slide groove 20a formed perpendicular to the axial direction. A moving piece (square piece) 21 is slidably engaged. The rear end portion of the connecting link 22 in the front-rear direction is connected to a swing lever 23 fixed to the right end portion of the swing shaft 16, and the front end portion of the connection link 22 is connected to the sliding piece 21.

  The connecting link 22 is connected to one end portion of an annular eccentric ring 25 fitted on an eccentric cam 24 fixed to the lower shaft 11 at a slightly rear side in the middle of the front-rear direction. However, the amount of rotation of the feed changer 20 around the horizontal axis is adjusted by a feed adjusting mechanism 30 described later.

  Therefore, since the eccentric ring 25 moves up and down by the rotation of the lower shaft 11, the connecting link 22 moves up and down along the sliding groove 20 a with the front end, that is, the sliding piece 21, with the rear end serving as a swing fulcrum. At this time, the connecting link 22 swings back and forth via the sliding piece 21 according to the rotation angle of the feed switching device 20 around the horizontal axis, that is, the forward feed swing or the reverse feed swing at the cloth feed timing. Therefore, the feed base 15 swings back and forth by the rotation of the swing shaft 16 connected to the connecting link 22.

  Next, the feed adjustment mechanism 30 that generates the cloth feed amount for the forward feed or the reverse feed according to the adjustment amounts of the forward and reverse feed adjustment dials 35 and 60 described above will be described. The feed adjustment mechanism 30 includes a forward feed adjustment mechanism 31 that generates a positive cloth feed amount and a reverse feed adjustment mechanism 32 that generates a reverse (negative) cloth feed amount. First, the forward feed adjusting mechanism 31 will be described.

  As shown in FIGS. 2 to 6, a shaft member 35 a of a forward feed adjustment dial 35 is rotatably screwed into a screw hole Fa formed in the machine frame F of the pedestal column portion 2 in the front-rear direction. In other words, the forward feed adjustment dial 35 moves forward and backward (moves back and forth) via the shaft member 35a by a turning operation by an operator. A forward feed adjuster 36 is disposed immediately behind the shaft member 35a, and is rotatably supported by the machine frame F via a pivot shaft 37 that is directed to the left and right.

  An upper end portion of a first connection link 39 that is vertically oriented is connected to a rear end portion of the forward feed adjuster 36 via a pivot pin 38, and the first connection link 39 is connected to a reverse feed adjustment mechanism 32 described later. The feed adjusting lever 41 is fixed to the right end of the feed adjusting shaft 42 through the second connecting link 40. The rear end portion of the feed adjusting link 44 is connected to the operating lever 43 fixed to the left end portion of the feed adjusting shaft 42, and the front end portion of the feed adjusting link 44 is connected to the right end portion of the feed switching unit 20.

  Therefore, the feed adjusting shaft 42 is rotated by the forward feed adjusting mechanism 31 or the reverse feed adjusting mechanism 32 via the first and second links 39 and 40 and the feed adjusting lever 41. By the movement, the rotation angle of the feed changer 20 around the horizontal axis is changed, and the cloth feed amount is adjusted.

  A cam portion 36 a that receives the spherical tip of the shaft member 35 a of the forward feed adjustment dial 35 is formed at the front end portion of the forward feed adjuster 36. As shown in FIG. 7, the cam portion 36a is formed with a first feed adjustment cam surface 36b and a second feed adjustment cam surface 36c continuous to the first feed adjustment cam surface 36b. Here, the inclination angle β of the second feed adjustment cam surface 36c is smaller than the inclination angle α of the first feed adjustment cam surface 36b with respect to the surface S orthogonal to the shaft member 35a of the forward feed adjustment dial 35. has been edited.

  The first feed adjustment cam surface 36b from the point u to the point v in the cam portion 36a is formed in a planar shape with a length L1 corresponding to the first rotation of the forward feed adjustment dial 35, and in the cam portion 36a. The second feed adjustment cam surface 36c from the point v to the point w is formed in a planar shape with a length L2 corresponding to the next one rotation of the feed adjustment dial.

  Next, the rotation restricting mechanism 50 provided close to the left side of the shaft member 35a of the forward feed adjusting dial 35 will be described. As shown in FIGS. 4 and 6, a thin guide pin 52 and a thick rotation are provided on a circular restriction release plate 51 a constituting the restriction release member 51 (which corresponds to an engagement member that engages with the rotation restriction member). A restricting pin 53 (which corresponds to a rotation restricting member) is fixed at the front end (front end).

  Here, the restriction release member 51 includes a restriction release plate 51a, a release operation portion 51b on the substantially left half of the restriction release plate 51a, and the like. That is, the release operation portion 51b is integrally formed with the restriction release plate 51a that is an engaging member. Further, an acute-angled tip 53a of the rotation restriction pin 53 is inserted through the restriction release plate 51 and protrudes forward.

  The machine frame F is formed with a front-rear direction guide hole Fb and a pin hole Fc. The guide pin 52 is fitted into the guide hole Fb from the front, and the rotation restricting pin 53 and a compression coil spring that elastically biases the rotation restricting pin 53. 54 is fitted in the pin hole Fc. Therefore, the rotation restricting pin 53 can be moved forward and backward in the machine frame F. Here, an annular wall portion 35c is formed in the vicinity of the rear end and in the vicinity of the outer periphery of the forward feed adjusting dial 35, and a large number of dot-like recesses (not shown) are formed in a circle every minute predetermined distance on the annular wall portion 35c. Has been.

  Therefore, the forward-feeding adjustment dial is configured such that the acute-angled tip 53a of the rotation restricting pin 53 spring-biased by the compression coil spring 54 engages with any of these many point-like recesses in a pressing manner. 35 can be held in the manually operated operating position. As described above, since the rotation restricting pin 53 is always pressed against the annular wall portion 35c from the rear via the acute-angled tip portion 35a, the forward feed adjusting dial 35 is moved forward and backward by the turning operation by the operator. In synchronization with the rotation, the rotation restricting pin 53 moves forward and backward while being guided by the guide pin 52 via the restriction releasing plate 51a.

  Therefore, a predetermined engagement gap S is always provided between the restriction release plate 51a and the rear end of the operation portion 35b of the forward feed adjustment dial 35. By the way, a block-shaped engaging portion 35d protruding rearward is integrally formed on a part of the annular wall portion 35c of the forward feed adjusting dial 35. However, the protrusion dimension t protruding rearward from the rear end of the operation portion 35b of the engagement portion 35d is smaller than the engagement gap S.

  Therefore, when the forward feed adjustment dial 35 is rotated once, that is, at the position where the forward feed adjustment dial 35 is rotated counterclockwise from the rotational position of the cloth feed amount “0” by about the first rotation, Since the engaging portion 35d abuts on the tip portion 35a of the rotation restricting pin 53, the rotation of the forward feed adjusting dial 35 is restricted.

  However, even when the counterclockwise turning operation of the forward feed adjusting dial 35 is restricted, the release operation portion 51b of the restriction release plate 51a is moved backward by the operator's finger as shown by a two-dot chain line in FIG. By pushing, the rotation restricting pin 53 is simultaneously retracted backward beyond the projecting dimension t, so that the engaging portion 35d does not interfere with the distal end portion 35a of the rotation restricting pin 53, and the rotation restriction is released. The feed adjustment dial 35 can be rotated counterclockwise for the next one rotation.

  Thus, the shaft member 35a moves from the first feed adjustment cam surface 36b to the second feed adjustment cam surface 36c not only by the first rotation of the forward feed adjustment dial 35 but also by the rotation of the next one rotation. Accordingly, the rotation angle of the forward feed adjuster 36 is changed as needed. That is, based on the rotation angle of the forward feed adjuster 36 according to the adjustment amount of the forward feed adjustment dial 35, as described above, the rotation angle around the horizontal axis of the feed switching device 20 via the feed adjustment shaft 42, That is, the regular cloth feed amount is adjusted (changed).

  As shown in FIGS. 1 and 4, the white display surface 35 e which is the front surface of the operation portion 35 b of the forward feed adjusting dial 35 has a positive cloth feed scale “0 to 2.5” for the first rotation on its outer peripheral side. Is written with black numbers and bar symbols at intervals of 0.25 mm, and the next one-turn regular cloth feed scale “2.5 to 5” is displayed at the inner circumference side with white numbers and bar symbols at intervals of 0.5 mm. It is described in. In this case, the number and bar symbol of the set normal cloth feed amount are made to coincide with the alignment recess Fd provided in a circle in the machine frame F corresponding to the upper side of the operation unit 35b.

  Next, the reverse feed adjustment mechanism 32 will be described. As shown in FIGS. 2 and 3, the shaft member 60 a of the reverse feed adjustment dial 60 is rotatably screwed into a screw hole (not shown) formed in the machine frame F of the pedestal column portion 2 in the front-rear direction. ing. That is, the reverse feed adjustment dial 60 moves forward and backward (moves back and forth) via the shaft member 60a by a turning operation by an operator. A reverse feed adjuster 61 is disposed immediately behind the shaft member 60a, and is rotatably supported by the machine frame F via a reverse feed shaft 62 that is directed to the left and right.

  The connecting lever 63 and the base end portion of the reverse stitching lever 64 are fixed to the reverse feed shaft 62. The lower end portion of the first connecting link 39 is connected to the connecting lever 63 and the upper end portion of the second connecting link 40 is connected to the connecting lever 63. A substantially vertical cam surface 61a is formed at the front end of the reverse feed adjuster 61, and the spherical tip of the shaft member 60a of the reverse feed adjustment dial 60 comes into contact with the cam surface 61a from the front.

  Therefore, by turning the reverse feed adjustment dial 60 clockwise or counterclockwise, the turning angle of the reverse feed adjuster 61 is changed as needed through the forward / backward movement of the shaft member 60a. That is, based on the rotation angle of the reverse feed adjuster 61 corresponding to the adjustment amount of the reverse feed adjustment dial 60, the reverse feed shaft 62, the connecting lever 63, the second connecting link 40, the feed adjusting lever 41 and the feed adjusting shaft 42 are provided. The rotation angle around the horizontal axis of the feed changer 20, that is, the reverse cloth feed amount is adjusted (changed).

  By the way, when the positive cloth feed amount is increased by rotating the forward feed adjustment dial 35 counterclockwise, the forward feed adjuster 36 is clockwise in a side view, and the first connecting link 39 moves downward. Therefore, the reverse feed shaft 62 and the connecting lever 63 are clockwise in a side view. That is, since the reverse feed adjuster 61 is separated from the shaft member 60a of the reverse feed adjustment dial 60, a positive cloth feed amount can be generated without interfering with the reverse feed adjuster 61.

  On the other hand, when the reverse feed amount is increased by rotating the reverse feed adjustment dial 60 counterclockwise, the reverse feed adjuster 61 is counterclockwise in a side view, and the first connecting link 39 moves upward. Therefore, the forward feed adjuster 36 is counterclockwise in a side view. That is, since the forward feed adjuster 36 is separated from the shaft member 35a of the forward feed adjustment dial 35, a reverse cloth feed amount can be generated without interfering with the forward feed adjuster 36.

  As shown in FIGS. 1 and 4, on the white display surface 60 c that is the front surface of the operation unit 60 b of the reverse feed adjustment dial 60, the reverse cloth feed scale “0 to −5” is written in black numerals. In this case, the number of the reverse cloth feed amount to be set is made to coincide with the matching recess Fe provided in a circle in the machine frame F corresponding to the upper side of the operation unit 60b.

  Next, operations and effects of the forward feed adjusting mechanism 31 and the rotation restricting mechanism 50 configured as described above will be described.

  As shown in FIG. 5A, when the operation portion 35b of the forward feed adjustment dial 35 is manually operated to set the regular cloth feed amount “0”, as shown in FIG. Is in contact with a point u on the back side of the first feed adjustment cam surface 36b. Therefore, as described above, the forward feed adjuster 36 has a specific posture, and the rotation angle of the feed switching device 20 around the horizontal axis is a specific angle. The cloth feed amount becomes “0”.

  As shown in FIG. 8A, when the operation unit 35b of the forward feed adjustment dial 35 is manually operated and the first approximately 1 rotation is rotated from the normal cloth feed amount “0” to “2.5”, As shown in 8-2, the tip of the shaft member 35a moves along the first feed adjustment cam surface 36b to a point v on the near side of the first feed adjustment cam surface 36b. Therefore, as described above, since the forward feed adjuster 36 rotates clockwise, as shown in FIG. 11, the positive fabric feed amount can be adjusted to a maximum of “about 2.5 mm”.

  Thus, when the forward feed adjusting dial 35 is rotated about the first about one turn, the engaging portion 35d is brought into contact with the tip end portion 53a of the turning restricting pin 53 by the turning restricting mechanism 50. The rotation of the adjustment dial 35 is restricted. Therefore, the positive cloth feed amount can be finely adjusted within the range of “0 to about 2.5 mm”, and it is restricted that a large positive cloth feed amount is not set carelessly.

  By the way, when the staggered sewing machine M is used as a main sewing machine (straight stitching machine) and a large straight cloth feed amount of 3 to 4 mm is required, as shown by a two-dot chain line in FIG. The rotation restricting pin 53 is retracted backward simultaneously by pushing the release operation part 51b of the restriction releasing plate 51a backward with a finger, so that the tip 53a of the rotation restricting pin 53 is engaged. Interference with the joint portion 35d is eliminated, and the forward feed adjustment dial 35 can be further turned counterclockwise for one rotation.

  In this case, as shown in FIG. 10A, when the operation unit 35b of the forward feed adjusting dial 35 is rotated about the next one rotation from the normal cloth feed amount “2.5” to “5”, FIG. As shown in -2, the tip of the shaft member 35a moves to the point w on the near side along the second feed adjustment cam surface 36c. Therefore, as described above, since the forward feed adjuster 36 further rotates clockwise, as shown in FIG. 11, the positive cloth feed amount can be adjusted to a maximum of “about 5 mm”.

  Thus, when the forward feed adjustment dial 35 is rotated by about one turn, the engagement portion 35d is brought into contact with the tip end portion 53a of the rotation restriction pin 53 by the rotation restriction mechanism 50. In addition, the rotation of the forward feed adjustment dial 35 is restricted. Therefore, the positive cloth feed amount can be finely adjusted within the range of “2.5 to 5 mm”, and the positive cloth feed amount is inadvertently limited so as not to be set.

  As described above, in the forward feed adjusting mechanism 31 of the staggered sewing machine M provided with the forward feed adjusting dial 35, the forward feed adjuster 36, and the feed switching device 20, the rotation restricting pin 53, the restriction releasing member 51, Therefore, the rotation range for the first approximately one rotation of the forward feed adjustment dial 35 is restricted by the rotation restriction pin 53, and inadvertently entering the rotation range for the next one rotation is forced. Can be prevented. Therefore, the rotation angle of the forward feed adjuster 36 is adjusted based on the adjustment amount “0 to about 2.5 mm” for the first approximately one rotation of the forward feed adjustment dial 35, and the forward feed adjuster 36 is rotated. Depending on the angle, the feed changer 20 can generate a cloth feed amount “0 to about 2.5 mm” corresponding to the adjustment amount for the first rotation of the forward feed adjustment dial 35.

  However, if necessary, the adjustment amount by the forward feed adjustment dial 35 can be switched to the rotation range for the next one rotation only by releasing the rotation restriction of the rotation restriction pin 53 by the restriction release member 51. The feed changer 20 can generate the cloth feed amount “about 2.5 to 5 mm” corresponding to the adjustment amount for the next one rotation of the forward feed adjustment dial 35.

  Further, the rotation restricting pin 53 is elastically biased by the compression coil spring 54 so as to be able to advance and retreat in the machine frame F and to have its acute-angled tip 53a abut against the engaging portion 36d of the forward feed adjusting dial 35, thereby releasing the restriction. The member 51 includes a restriction release plate 51a that engages with the rotation restriction pin 53, and a release operation portion 51b that releases the engagement of the rotation restriction pin 53 with the engagement portion 35d via the restriction release plate 51a. Therefore, the rotation restricting pin 53 and the feed adjusting dial engaging portion 35d can be simply released by releasing the release restricting portion 51b in the direction opposite to the biasing direction. Can be easily released.

  In addition, by providing the rotation restriction pin 53 in the machine frame F, the rotation restriction mechanism 50 provided with the rotation restriction pin 53 and the restriction release member 51 can be reduced in size and improved in operability.

  Further, since the release operation portion 51b is integrally formed with the restriction release plate 51a, not only the rotation restriction mechanism 50 provided with the rotation restriction pin 53 and the restriction release member 51 can be reduced in size by reducing the number of parts. Assemblability can be improved and costs can be reduced.

  Further, since the restriction release member 51 is provided close to the forward feed adjustment dial 35, the operator can operate the restriction release member 51 at the same time while operating the forward feed adjustment dial 35 with one hand, and the restriction release member 51. The operability of the releasing operation can be improved.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1] As shown in FIG. 12, a rotation restriction mechanism 50A in which the rotation restriction mechanism 50 is partially changed is provided, and the rotation restriction pin 71 is moved backward by operating the release operation button 73a. You may make it cancel | release the rotation control by the control pin 71. FIG.

  That is, a pair of left and right pin holes Ff and Fg facing in the front-rear direction and a substantially rectangular recess Fh in plan view are formed in the machine frame F, and the recess Fh and the pin holes Ff and Fg are covered at the front end. Thus, the cover plate 70 is closed, and the cover plate 70 is fixed to the machine frame F with a plurality of screws (not shown). The cover plate 70 is formed with a pair of insertion holes 70a and 70b.

  A rotation restriction pin 71 (corresponding to a rotation restriction member) and a compression coil spring 72 that elastically urges the rotation restriction pin 71 are fitted into the pin hole Fg, and the rotation restriction pin 71 is connected to the pin hole Fg. It is slidably supported back and forth via the right insertion hole 70b. The restriction release shaft 73 disposed in the front-rear direction inside the recess Fh is supported by fitting into the left pin hole Ff at the rear end portion thereof, and a release operation button 73a (this is a release operation portion) at the front end portion thereof. Is supported through the left insertion hole 70a so as to be slidable back and forth.

  A horizontal pivot wall 70c extending rearward is integrally formed in the middle step in the height direction of the left end portion of the cover plate 70, and the left end of the swing lever 74 (which corresponds to an engaging member) is formed on the pivot wall 70c. The part is pivotally supported by a screw 75 so as to be horizontally swingable. The swing lever 74 passes through a through-hole (not shown) having a substantially rectangular cross section formed horizontally on the restriction release shaft 73 at a portion from the base end portion thereof, and is provided on the rotation restriction pin 71 at the right end portion thereof. It engages with the formed engagement hole (not shown).

  By the way, the swing lever 74 is connected to the restriction release shaft 73 by a screw 76 at a portion where the restriction release shaft 73 penetrates, and swings back and forth in synchronization with the movement of the restriction release shaft 73 in the front-rear direction. The rotation restricting pin 71 is also moved in the front-rear direction. Here, the restriction release member 77 includes a swing lever 74, a release operation button 73a of the restriction release shaft 73, and the like.

  The distal end portion 71a of the rotation restricting pin 71 is formed in an acute angle shape as in the above-described embodiment, and is engaged with any of a number of point-like concave portions of the annular wall portion 35c formed in the forward feed adjusting dial 35. By combining, the forward feed adjustment dial 35 can be held at the manually operated operating position.

  Since the rotation restricting mechanism 50A is configured in this way, when the forward feed adjusting dial 35 is rotated by about the first rotation, the engaging portion 35d comes into contact with the tip portion 71a of the rotation restricting pin 71. Thus, the rotation of the forward feed adjustment dial 35 is restricted. Therefore, the positive cloth feed amount can be finely adjusted within the range of “0 to about 2.5 mm”, and it is restricted that a large positive cloth feed amount is not set carelessly.

  On the other hand, when a large cloth feed amount of 3 to 4 mm is required, as shown by a two-dot chain line in FIG. 12, the operator pushes the release operation button 73a backward with a finger to perform the release operation. In this case, since the release operation button 73a is far away from the forward feed adjustment dial 35 on the left side, the release operation button 73a can be easily released. As a result, the swing lever 74 swings backward, and at the same time, the rotation restricting pin 71 is also retracted backward, so that the front end 71a of the turn restricting pin 71 does not interfere with the engaging portion 35d, and the forward feed adjusting dial. 35 can be further rotated counterclockwise for one rotation.

  2] In the present invention, the rotation of the feed adjustment dial is restricted and the restriction is released. However, the thread tension dial used in the thread tension device described in Japanese Utility Model Publication No. 3-31268, The rotation of the presser adjustment dial used in the presser foot adjustment device described in Japanese Patent Application Laid-Open No. 62-202278 and the knife height adjustment dial used in the sewing machine female drive mechanism described in Japanese Patent Application Laid-Open No. 9-285684 are restricted every rotation. However, the present invention may be applied to cancel the restriction.

  3] As shown in FIG. 13, a forward feed adjuster 36A in which the forward feed adjuster 36 is partially changed is provided, and the cam portion 36a of the forward feed adjuster 36A corresponds to one rotation of the forward feed adjustment dial 35. Further, the cam portion 36a includes a first feed adjustment cam surface 36e having a length corresponding to about 240 ° of one rotation of the forward feed adjustment dial 35, and a forward feed adjustment dial 35. A second feed adjustment cam surface 36f having a length corresponding to about 120 ° of one rotation of the second rotation may be formed. However, the inclination angle β of the second feed adjustment cam surface 36f with respect to the surface S orthogonal to the shaft member 35a of the forward feed adjustment dial 35 is smaller than the inclination angle α of the first feed adjustment cam surface 36e.

  In this case, a small cloth feed amount “0 to about 2.5 mm” can be generated by the first feed adjustment cam surface 36e while the forward feed adjustment dial 35 is rotated once, and further, the second feed adjustment dial 35 following this. Since the large cloth feed amount “about 2.5 to 5 mm” can be continuously generated by the feed adjusting cam surface 36f, the flexibility and adaptability are remarkably improved in the cloth feed amount by one staggered sewing machine M. be able to.

  4] Each of the first feed adjustment cam surfaces 36b and 36e and the second feed adjustment cam surfaces 36c and 36f can be formed in a curved shape other than a flat surface, for example. Further, the first feed adjusting cam surfaces 36b and 36e and the second feed adjusting cam surfaces 36c and 36f may be formed continuously and smoothly.

  5] The cam portion 36a of the forward feed adjuster 36 is formed by continuously forming first to third feed adjustment cam surfaces each having a length corresponding to one rotation of the forward feed adjustment dial 35. Therefore, it is possible to greatly increase the adjustment amount of the cloth feed in the staggered sewing machine M.

  6) The present invention is not limited to the embodiments described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes those modifications.

1 is a front view of a staggered sewing machine according to an embodiment of the present invention. It is a perspective view of a feed dog drive mechanism and a feed adjustment mechanism provided in a staggered sewing machine. It is a perspective view of the bottom face of a feed dog drive mechanism and a feed adjustment mechanism. It is the elements on larger scale of the pedestal part of a staggered sewing machine. It is a front view of the forward feed adjustment dial when the cloth feed amount is zero. It is a principal part vertical side view of the forward feed adjustment mechanism when the cloth feed amount is zero. It is a principal part cross-sectional top view of a forward feed adjustment mechanism and a rotation control mechanism. It is a side view of a forward feed adjuster. It is a principal part vertical side view of the forward feed adjustment mechanism when the cloth feed amount is small. It is a front view of the forward feed adjustment dial when the cloth feed amount is small. FIG. 7 is a view corresponding to FIG. 6 for releasing the restriction of the restriction release pin. It is a principal part vertical side view of the forward feed adjustment mechanism when the cloth feed amount is large. It is a front view of the forward feed adjustment dial when the cloth feed amount is large. It is a diagram which shows the relationship between the scale of a positive feed adjustment dial, and the right cloth feed amount. FIG. 10 is a diagram corresponding to FIG. 9 according to a modified embodiment. FIG. 8 is a diagram corresponding to FIG. 7 according to a modified embodiment.

Explanation of symbols

M Staggered sewing machine 20 Feed changer 31 Forward feed adjustment mechanism 35 Forward feed adjustment dial 35a Shaft member 36 Forward feed adjuster 50 Rotation restriction mechanism 50A Rotation restriction mechanism 51 Restriction release member 51a Restriction release plate 51b Release operation part 53 times Movement restriction pin 71 Rotation restriction pin 73a Release operation button 74 Swing lever 77 Restriction release member

Claims (5)

In a sewing machine equipped with an adjustment dial provided in the machine frame of the sewing machine and capable of adjusting the control amount of the control target according to the adjustment amount of the adjustment dial,
A rotation restricting member for restricting the rotation of the adjustment dial at a position where the adjustment dial is rotated by about the first rotation;
In order to allow the rotation of the adjustment dial for the next one rotation, a restriction release member that can release the rotation restriction of the adjustment dial by the rotation restriction member;
A sewing machine characterized by providing A feed adjustment dial provided on the machine frame of the sewing machine, a feed adjuster whose rotation angle is adjusted according to the adjustment amount of the feed adjustment dial, and a cloth formed by a feed dog according to the rotation angle of the feed adjustment dial In a sewing machine feed adjustment mechanism equipped with a feed switching device for generating a feed amount,
A rotation restricting member for restricting the rotation of the feed adjusting dial at a position where the feed adjusting dial is rotated by about the first rotation;
A restriction release member capable of releasing rotation restriction of the feed adjustment dial by the rotation restriction member in order to allow rotation of the feed adjustment dial for the next one rotation;
A sewing machine feed adjustment mechanism characterized by comprising   The rotation restricting member is elastically urged by an urging means such that the rotation restricting member can advance and retreat in the machine frame and a tip portion thereof can abut on an engaging portion of a feed adjusting dial, and the restriction releasing member is 3. The engaging member according to claim 2, further comprising: an engaging member that engages and a release operation unit that releases the engagement of the rotation restricting member with the engaging unit via the engaging member. Sewing machine feed adjustment mechanism.   4. The sewing machine feed adjustment mechanism according to claim 3, wherein the release operation portion is formed integrally with the engaging member. 5. The sewing machine feed adjustment mechanism according to claim 2, wherein the restriction release member is provided close to the feed adjustment dial.