JP2016137027A - Presser adjustment mechanism of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the front-and-back position of a presser member 91.SOLUTION: A presser adjustment mechanism 100 of a sewing machine includes: a presser member 91 for pressing objects C1 and C2 to be sewn from above; and a presser bar 92 which supports the presser member in such a way that the presser member is moved to an upstream side in a feeding direction as the presser member is raised, and is moved to a downstream side in the feeding direction as the presser member is lowered, and which is vertically movably supported in a sewing machine frame 2. The presser adjustment mechanism 100 further includes a connection member 47 which is directly or indirectly connected with the presser bar and is changed in position or attitude as the presser bar is vertically moved. On the outside of the sewing machine frame, there is provided an adjustment body 52 for holding the connection member at an optional position or in an optional attitude.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a presser adjusting mechanism for a sewing machine capable of adjusting the front / rear position of a presser member for a flat stitch sewing machine that sews a fabric in which two cloths are stacked one above the other.

A sewing machine that feeds a sewing object by cooperating with a feed dog that moves up and down from the opening provided in the needle plate and that also moves in the feed direction when it appears, and a pressing member that can be moved up and down and supported downward. In this case, the lower surface side of the workpiece is fed in the feeding direction by the feed dog, but the upper cloth feed is delayed with respect to the lower cloth feed because the pulling action is exerted by the pressure contact with the pressing member against the upper face side of the fabric. So-called stitching may occur.
In such a case, the sewing product that is sent incompletely shifts to the left or right, or when there is a sewing shift that causes a delay in the needle entry position of the upper cloth when the upper cloth and the lower cloth are overlapped and sewn. was there.
As means for preventing any such stitching, conventionally, for example, one having a configuration as disclosed in Japanese Patent No. 3915017 has been proposed.

In the conventional mechanism, the above problem is solved by the pressing portion 90 shown in FIG.
The presser 90 includes a presser bar 92 supported by the machine frame of the sewing machine, a presser support frame 93 provided at the lower end of the presser bar 92, and a predetermined horizontal direction (Y-axis direction). Bell crank 94 as a rotating body supported so as to be rotatable about an axis along the vertical axis), a pressing member 91 supported at the tip of the first arm portion 941 of the bell crank 94, and a bell crank 94. The lower end of the second arm portion 942 is connected to the lower end portion of the second arm portion 942 and threaded into the screw shaft 95 that is passed through the insertion hole formed in the holding support frame 93 and the screw groove formed in the upper end portion of the screw shaft 95. The adjusting nut 96 and the spring 97 that urges the pressing member 91 supported by the first arm portion 941 of the bell crank 94 through the adjusting nut 96 and the screw shaft 95 in the direction in which the pressing pressure is generated downward. Have (example If, see Patent Document 1).
The feed direction of the sewing product is horizontal, the direction along the feed direction is the X-axis direction, the downstream side in the feed direction is the front side, and the upstream side is the rear side. Further, the direction that is horizontal and orthogonal to the X-axis direction is the Y-axis direction, and the left-hand side is the left side and the right-hand side is the right side when facing the front side. The vertical vertical direction is the Z-axis direction.

The presser support frame 93 extends obliquely downward from the lower end of the presser bar 92, and the bell crank 94 is supported so as to be rotatable around the Y axis at the intermediate portion in the extension direction of the presser support frame 93. ing.
The bell crank 94 is arranged so that the first arm portion 941 extends obliquely downward and the second arm portion 942 extends obliquely downward and forward with respect to the presser support frame 93. . That is, the pressing member 91 supported by the first arm portion 941 has a tangential direction of the arc that becomes a trajectory of the rotation of the tip portion of the first arm portion 941, that is, a rear oblique upper side and a front oblique lower side. Is supported so as to be movable.
As a result, the pressing member 91 moves forward as the presser bar 92 rises, and moves backward as the presser bar 92 moves down.

Further, in the bell crank 94, the second arm portion 942 receives an applied pressure (torque clockwise R in FIG. 4) on the front diagonally upper side by the spring pressure of the spring 97 via the screw shaft 95. A pressing force is applied to the pressing member 91 via the arm portion 941 obliquely downward. The pressure applied to the pressing member 91 becomes the pressing pressure on the upper cloth C1 and the lower cloth C2, which are the sewing objects on the upper surface of the needle plate 101.
Note that the spring pressure of the spring 97 can be arbitrarily adjusted by rotating the adjusting nut 96. That is, when the adjustment nut 96 is rotated, the coiled spring 97 interposed between the adjustment nut 96 and the upper surface of the holding support frame 93 expands and contracts, so that the spring pressure can be changed according to the expansion / contraction amount.

  The holding portion 90 moves once obliquely upward in the process in which the feed dog 102 protrudes from the opening of the needle plate 101 and moves upward, and moves obliquely in the lower direction in the process of moving forward while the feed dog 102 descends. To do. Accordingly, when the feed dog 102 sends out the upper cloth C1 and the lower cloth C2 which are the sewing products, the pressing member 91 also moves forward and sends it out. This makes it possible to suppress warping and sewing misalignment.

Japanese Patent No. 3915017

The pressing member 91 in the pressing portion 90 is required to be disposed at an appropriate position in the front-rear direction.
For example, when the pressing member 91 is displaced forward (a state where the first arm portion 941 is nearly vertical), even if the vertical movement is applied by the feed dog 102, the pressing member 91 performs a good vertical movement. This cannot be performed, and accordingly, the forward / backward movement is not performed well, so that the upper cloth C1 cannot be fed well.
Further, when the pressing member 91 is displaced rearward (a state where the first arm portion 941 is nearly horizontal), when the vertical movement is given by the feed dog 102, the pressing member 91 also moves up and down. However, the movement component in the front-rear direction is reduced, and the upper cloth C1 cannot be fed well.

Therefore, in the pressing portion 90, it is essential to align the front-rear direction in a state where the sewing product of the pressing member 91 is pressed with reference to the needle drop position.
The presser 90 having the same configuration as the presser 90 of the above-mentioned Patent Document 1 generally has a pressing spring that constantly presses the presser bar 92 described above inside the surface of the sewing machine, and a presser bar 92. A rod holder fixedly installed in the middle position, a rod holder guide provided in the machine frame of the sewing machine and formed with a guide groove into which a projection of the rod holder is inserted, and a lower side of the rod holder fixed to the rod holder guide It comes with a stopper that comes into contact. The holding bar 92 is maintained in a state in which the bar holding is pressed against the stopper by a pressing spring, and the stopper determines the height of the holding bar 92. During the sewing, the presser bar 92 maintains the specified height of the stopper.
And the stopper is screwed to the rod holding guide through the long hole, and the upper and lower positions of the stopper can be adjusted by loosening the screw, and it is possible to adjust the specified height of the presser bar 92 I was trying. That is, when the specified height of the presser bar 92 is moved upward through the stopper, the presser member 91 is moved to the front obliquely lower side and adjusted to the front side, and when the specified height of the presser bar 92 is moved downward through the stopper, The member 91 moves rearward and obliquely upward and is adjusted to the rear side.

  However, since the front and rear positions of the pressing member 91 change as the thickness of the sewing object changes, the position adjustment of the front and rear of the pressing member 91 is frequently performed. Nevertheless, in order to adjust the front / rear position of the pressing member 91, it is necessary to remove the face plate of the sewing machine and access the stopper inside the machine frame, which is a problem that the adjustment work is heavy. .

  An object of the present invention is to make it possible to easily adjust the front and rear positions of the pressing member.

The invention described in claim 1
A holding member that holds the workpiece from above,
A pressing bar that supports the pressing member and is supported so as to be vertically movable in the sewing machine frame so that the pressing member moves to the upstream side in the feeding direction as it rises and moves to the downstream side in the feeding direction as it descends. In the sewing machine presser adjustment mechanism,
Directly or indirectly connected to the presser bar, comprising a connecting member capable of moving the presser bar up and down by adjusting the position or posture,
An adjusting body for holding the connecting member in an arbitrary position or an arbitrary posture is provided outside the sewing machine frame.

The invention described in claim 2 is the sewing machine presser adjusting mechanism according to claim 1,
The pressing bar supports the pressing member via a rotating body that is rotatably supported at a lower end portion thereof.

The invention according to claim 3 is the presser adjusting mechanism for the sewing machine according to claim 1 or 2,
The connecting member is a press-up lever that manually lifts the press-up member upward to release the press-down state of the sewing product,
The adjustment body is a cam member that abuts on the press-up lever and regulates the rotation angle to an arbitrary angle.

  According to the present invention, the position of the pressing member in the front-rear direction can be adjusted by operating an adjusting body provided outside the sewing machine frame, and it is not necessary to open the surface portion or the like to access the inside of the sewing machine frame. The burden can be drastically reduced. Moreover, it becomes possible to adjust quickly. In addition, this is particularly effective when the adjustment of the pressing member in the front-rear direction is required every time the thickness of the sewing object changes, such as when the adjustment is frequently required.

It is a disassembled perspective view of the presser adjusting mechanism of the sewing machine. It is a perspective view of a sewing machine frame of a sewing machine equipped with a presser adjusting mechanism. It is a top view of a pressing member. It is a side view of a pressing part.

[Outline of Embodiments of the Invention]
1 is an exploded perspective view of a presser adjusting mechanism 100 for a sewing machine according to an embodiment of the invention, FIG. 2 is a perspective view of a sewing machine frame 2 of the sewing machine 1 on which the presser adjusting mechanism 100 is mounted, and FIG. .
The presser adjusting mechanism 100 described below has the same configuration as the presser unit 90 shown in FIG. 4 described above, and the same configuration as the presser unit 90 is denoted by the same reference numeral and redundantly described. Is omitted.
The X-axis direction, Y-axis direction, Z-axis direction, front-rear direction, and left-right direction are also as described above.

  The presser adjusting mechanism 100 is provided inside the sewing machine arm portion of the sewing machine frame 2 that is a machine frame of the sewing machine, and supports the presser bar 92 of the presser unit 90 so as to be movable up and down along the Z-axis direction. A mechanism 20 and a press-up mechanism 40 that lifts the presser member 91 upward to release the pressed state of the sewing product are provided.

[Presser bar support mechanism]
The presser bar support mechanism 20 is inserted into a metal sleeve 21 that slides and supports the presser bar 92 so as to move up and down, and a bottomed hole 921 formed in the upper end portion of the presser bar 92, and the presser bar 92 is moved downward. A first pressing spring 22 to be pressed, a bar holder 23 fixed to the pressing bar 92 on the upper side of the metal sleeve 21, and a second pressing to press the pressing bar 92 downward by pressing against the upper part of the bar holding 23 The spring 24 includes an adjustment screw 25 that is inserted into a bottomed hole 921 formed at the upper end of the presser bar 92 at the lower end, and a fastening nut 26 that fixes the adjustment screw 25.

The adjusting screw 25 includes a lower small diameter portion 251 and an upper large diameter portion 252, and the boundary between the small diameter portion 251 and the large diameter portion 252 is a stepped portion. A male screw is formed on the outer peripheral surface of the large diameter portion 252. The large-diameter portion 252 is screwed into a screw hole that penetrates the upper surface of the sewing machine arm portion.
The adjustment screw 25 has the large diameter portion 252 screwed into the screw hole, the lower end portion of the small diameter portion 251 is pressed against the upper end portion of the first pressing spring 22, and the first pressing spring 22 is contracted. A downward pressing force against the pressing rod 92 is generated.
Further, the stepped portion of the adjusting screw 25 is in pressure contact with the upper end of the second pressing spring 24 and contracts the second pressing spring 24 to generate a downward pressing force against the pressing bar 92.
Since the adjusting screw 25 moves up and down with respect to the sewing machine arm portion by applying a rotation operation, the pressing force by the pressing springs 22 and 24 can be adjusted.

  The fastening nut 26 is attached to the male screw of the large-diameter portion 252 protruding upward from the screw hole of the sewing machine arm portion. The rotation can be prevented and the adjustment position can be maintained.

  The downward pressing force by the sum of the first and second pressing springs 22 and 24 is set sufficiently larger than the downward pressing force of the pressing member 91 by the spring 97. That is, when the pressing member 91 is moved upward due to the thickness of the cloth or the like, the pressing rod 92 does not move upward, and only the pressing member 91 moves rearward and obliquely upward.

[Holding mechanism]
The press-up mechanism 40 includes a first link member 41 having one end connected to the above-described rod holder 23, a transmission shaft 42 disposed in the Y-axis direction inside the sewing machine bed portion, and a transmission shaft. The base end is fixedly supported at one end of 42 and the first arm member 43 having the other end of the first link member 41 connected to the rotating end and the transmission shaft 42 can be rotated. A cylindrical member 44 to be supported, a second arm member 45 whose base end is fixedly supported on the other end of the transmission shaft 42, and one end of the second arm member 45 are connected to a rotating end of the second arm member 45. The second link member 46, a press-up lever 47 as a connecting member to which a manual turning operation is input, and one end of the second link member 46 are connected to the press-up lever 47, and are along the X-axis direction inside the sewing machine arm portion. Lever spindle 48 supported rotatably in a closed state , A metal sleeve 49 that rotatably supports the lever support shaft 48, a torsion coil spring 50 that urges the rotating end of the presser lever 47 upward, and a base end portion at the other end of the lever support shaft 48. The third arm member 51, which is fixedly equipped and whose rotation end is connected to the other end of the second link member 46, is in contact with the vicinity of the rotation end of the press-up lever 47 from above, A cam member 52 serving as a stopper for restricting further upward rotation, and a bar-holding guide 53 formed with a guide groove 531 which is fixed in the machine frame of the sewing machine and into which the protrusion 231 of the bar-holding 23 is inserted. And.

The first link member 41 is connected to the rod holder 23 so as to be rotatable around the Y axis, and the first link member 41 and the first arm member 43 are connected so as to be rotatable around the Y axis. The second arm member 45 is connected to the second link member 46 so as to be rotatable about the Y axis.
The third arm member 51 is connected to the second link member 46 so as to be rotatable about the X axis.

  The first arm member 43 is attached to the transmission shaft 42 with the rotating end portion 431 facing substantially rearward, and the first link member 41 is generally in the state along the Z-axis direction and the upper end portion of the first arm member 43 is first. The arm member 43 is connected to the rotating end 431.

  The second arm member 45 is attached to the transmission shaft 42 with the rotating end 451 facing substantially forward, and the second link member 46 has a top end 461 substantially in the Z-axis direction with the second end 461 at the second end. The arm member 45 is connected to the rotating end 451 of the arm member 45. The lower end portion 462 of the second link member 46 is connected to the rotating end portion of the third arm member 51.

  The second link member 46 has a long plate shape, and is twisted by 90 ° around an axis along the longitudinal direction in the middle portion in the longitudinal direction. The upper end portion of the second link member 46 is parallel to the XZ plane, and the lower end portion is parallel to the YZ plane. Accordingly, when the third arm member 51 connected to the lower end portion 462 of the second link member rotates around the X axis, the second link member moves up and down in the Z axis direction, and further the second link member. The second arm member 45 connected to the upper end portion 462 of the lens is rotated about the Y axis.

  Further, the third arm member 51 is attached at the rear end portion of the lever support shaft 48 with the rotation end portion thereof facing substantially rightward, and the press-up lever 47 is installed at the front end portion of the lever support shaft 48. It is attached with the rotating end portion facing generally to the right. The front end portion of the lever support shaft 48 protrudes to the outside of the sewing machine frame 2, and the press-up lever 47 is connected to the lever support shaft 48 outside the sewing machine frame 2. The press-up lever 47 can be turned by a person with respect to the turning end.

  The rod holding guide 53 is fixedly supported inside the sewing machine frame 2 and is disposed adjacent to the front side of the rod holding 23. The rotation restricting plate 53 is formed with a guide groove 531 along the Z-axis direction on the surface facing the rod holder 23, and the tip of a protrusion 231 extending forward from the rod holder 23 is inserted. For this reason, when the pressing bar 92 moves up and down, the protrusion 231 moves along the guide groove 531, so that the rotation of the pressing bar 92 is suppressed.

With the above configuration, the presser lifting lever 47 is rotated against the torsion coil spring 50 in the operation direction F11 (clockwise in the drawing) in which the presser member 91 moves upward to release the upper cloth C1 and the lower cloth C2 that are the sewing objects. When it is moved, the third arm member 51 is also rotated clockwise via the lever support shaft 48, and the second link member 46 is pulled down in the operation direction F12.
Accordingly, the second arm member 45 is rotated in the operation direction F13, and the first arm member 43 is also rotated in the same direction via the transmission shaft 42 connected to the second arm member 45. The link member 41 is pulled up in the operation direction F14.
As a result, the presser bar 92 and the presser member 91 can be pulled upward to be in a released state against the first and second press springs 22 and 24.

Further, in order to return the presser bar 92 and the presser member 91 to a state in which the upper cloth C1 and the lower cloth C2 can be pressed, the operating direction F21 (counterclockwise in the figure) is applied so as to follow the spring pressure of the torsion coil spring 50. The press-up lever 47 is rotated.
As a result, the third arm member 51 also rotates counterclockwise via the lever support shaft 48, and pushes up the second link member 46 in the operation direction F22.
As a result, the second arm member 45 is rotated in the operation direction F23, and the first arm member 43 is also rotated in the same direction via the transmission shaft 42 connected to the second arm member 45. The link member 41 is pushed down in the operation direction F24.
As a result, according to the first and second pressing springs 22 and 24, the presser bar 92 and the presser member 91 are lowered to be in a pressed state.

The presser lifting lever 47 is configured to move the lever support shaft 48 on the basis of the torsion coil spring 50 and the pressing force of the first and second pressing springs 22 and 24 transmitted by the members that transmit the lifting operation to the pressing bar 92. It is urged toward the operation direction F21 at the center. That is, turning force is applied in the direction in which the rotation end of the presser lifting lever 47 moves upward.
On the other hand, a contact portion 471 that is notched in a concave shape is formed at the upper edge portion in the vicinity of the rotation end portion of the press-up lever 47, and the cam member 52 contacts the contact portion 471 from above. ing. That is, the cam member 52 abuts on the press-up lever 47 urged upward by the torsion coil spring 50 and the first and second pressing springs 22 and 24 and restricts the upward rotation thereof. Yes.

The cam member 52 is a cylindrical eccentric cam provided outside the front surface of the sewing machine frame 2 with the center line thereof facing the X-axis direction. The cam member 52 is pivotally supported by a support shaft 54 that protrudes in the X-axis direction from the front surface of the sewing machine frame 2 toward the outside. The support shaft 54 is inserted into a through hole 521 provided at a position eccentric from the center of the cam member 52.
The outer peripheral surface of the cam member 52 is in contact with the contact portion 471 of the press-up lever 47 described above from above.
The cam member 52 is formed with two screw holes 522 penetrating from the outer peripheral surface thereof to the through hole 521, and a screw (headless screw) 523 is screwed into each screw hole 522. That is, by loosening these potato screws 523, the cam member 52 rotates about the support shaft 54, and the position of the outer peripheral surface of the cam member 52 that contacts the contact portion 471 of the press-up lever 47 can be changed. Since the radial distance from the center of the support shaft 54 to the outer peripheral surface of the cam member 52 varies depending on the position of the outer peripheral surface of the cam member 52, the press-up lever 47 contacts the cam member 52 and rotates upward. It is possible to arbitrarily change and adjust the rotation angle at which is controlled.
When the cam member 52 restricts the upward rotation of the rotation end of the presser lifting lever 47, the presser bar 92 can only be lowered to a certain height (lower limit position), The pressing bar 92 is held at the lower limit position by the pressing force of the first and second pressing springs 22 and 24.
That is, by rotating the cam member 52, the upward rotation angle of the presser lifting lever 47 is arbitrarily changed and adjusted, and accordingly, the lower limit position of the presser bar 92 can also be adjusted arbitrarily.

[Adjustment of front and back position of pressing member]
FIG. 3 is a plan view of the pressing member 91.
The front-rear position adjustment of the pressing member 91 will be described with reference to FIGS.
The front-rear position adjustment of the pressing member 91 is performed by sewing at an indentation point A, which is a reference point for alignment, adjacent to the right side of the opening 911 through which the sewing needle 3 on the upper surface of the pressing member 91 is passed. This is performed so that the needle drop position of the needle 3 matches in the X-axis direction. Although FIG. 3 illustrates the sewing machine 1 having three sewing needles 3, the number of sewing needles is not limited and may be one or more.

The front-rear position adjustment of the pressing member 91 is performed in a state where the pressing member 91 is pressing the upper cloth C1 and the lower cloth C2 that are the sewing objects.
First, the pulley 4 of the sewing machine 1 is rotated, the sewing needle 3 is lowered to the vicinity of the pressing member 91, and the position with the score A is compared. As a result, for example, when the marking point A of the presser member 91 is displaced forward with respect to the needle drop position of the sewing needle 3, the bell crank 94 in FIG. Therefore, it is necessary to adjust so that the pressing member 91 is lowered.
For this purpose, the cam member 52 may be rotated so that each member operates in the operation direction of F21, F22, F23, and F24. That is, the cam member is loosened so that the contact position of the outer peripheral surface of the cam member 52 with respect to the contact portion 471 of the press-up lever 47 becomes the outer peripheral surface position where the radial distance from the support shaft 54 is short. 52 is rotated. Then, the screw 523 is fastened and the cam member 52 is fixed even when the needle drop position of the sewing needle 3 coincides with the marking point A in the X-axis direction.

Further, when the marking point A of the presser member 91 is shifted rearward with respect to the needle drop position of the sewing needle 3, the bell crank 94 is rotated counterclockwise L from the proper position in FIG. Since it is moving, it is necessary to adjust so that the pressing member 91 rises.
For this purpose, the cam member 52 may be rotated so that each member moves in the direction of movement of F11, F12, F13, and F14. That is, the cam member is loosened so that the contact position of the outer peripheral surface of the cam member 52 with respect to the contact portion 471 of the press-up lever 47 becomes the outer peripheral surface position where the radial distance from the support shaft 54 is long. 52 is rotated. Then, the screw 523 is fastened and the cam member 52 is fixed even when the needle drop position of the sewing needle 3 coincides with the marking point A in the X-axis direction.

[Technical effects of the sewing machine presser adjustment mechanism]
The presser adjusting mechanism 100 of the sewing machine 1 includes a presser member 91 that presses the upper cloth C1 and the lower cloth C2 that are to be sewn from above, and the presser member 91 that moves to the downstream side in the feed direction as it rises, and the presser member that moves as it lowers The presser bar 92 is supported in such a manner that it can move up and down in the sewing machine frame 2, and members 41, 42, 43, 45, A push-up lever 47 that is indirectly connected through 46, 48, and 51 and whose position or posture changes as the presser bar 92 moves up and down. A cam member 52 serving as an adjusting body that holds the posture is arranged outside the sewing machine frame 2.
For this reason, the position adjustment of the pressing member 91 in the front-rear direction can be performed by rotating the cam member 52 provided outside the sewing machine frame 2, and it is not necessary to open the surface portion or the like to access the inside of the sewing machine frame 2. It becomes possible to dramatically reduce the burden of adjustment work. Moreover, it becomes possible to adjust quickly.
This is particularly effective when the adjustment of the presser member 91 in the front-rear direction is required every time the thickness of the sewing object changes, such as when the adjustment needs to be frequently performed.

  Further, since the presser bar 92 supports the presser member 91 via a bell crank 94 as a rotating body that is rotatably supported at the lower end portion thereof, in order to suppress warping and sewing displacement of the workpiece. The operation of the pressing member 91 moving to the upstream side in the feed direction as it rises and moving to the downstream side in the feed direction as it descends can be realized with a simple configuration.

  Further, as the connecting member, a presser lifting lever 47 that manually lifts the presser member 91 upward to release the pressed state of the sewing product is used, and the cam member 52 abuts on the presser lifter 47 and rotates freely. The position of the pressing member 91 in the front-rear direction is adjusted by regulating the angle. For this reason, a dedicated member for connecting the cam member 52 and the presser bar 92 is not required, and a structure for raising the presser can be used, so that the number of parts can be reduced and the manufacturing cost of the apparatus can be reduced. Can be achieved.

[Others]
The feed mechanism 100 can be used in any type of sewing machine that uses a pressing member that presses and holds the sewing product from above on the upper surface of the needle plate 101 and conveys the sewing product by a feed dog.

Moreover, although the case where the cam member 52 is used as the adjusting body has been illustrated, any member that can hold the position or posture of the connecting member at an arbitrary position or posture can be used.
For example, in the case of the press-up lever 47 described above, a screw member that comes into contact with the contact portion 471 from above may be used. In this case, the screw member may be supported by the sewing machine frame, moved up and down by rotating the upper end portion, and disposed so that the lower end portion contacts the contact portion 471.
Alternatively, a configuration may be adopted in which a latch mechanism is provided on the press-up lever 47 so that the position is held at every minute angle.
Alternatively, an arc-shaped long hole centered on the lever support shaft 48 is provided on the press-up lever 47 or the sewing machine frame 2 side, and a screw that can move relative to the long hole is fastened to fasten the press-up lever 47. It is good also as a structure which can hold | maintain at arbitrary rotation angles.

Furthermore, although the press-up lever 47 is illustrated as the connecting member, other members (for example, members such as reference numerals 41, 42, 43, 45, 46, 48, 51, 93) that interlock the vertical movement of the presser bar 92 are exemplified. On the other hand, it is good also as a structure which an adjustment body hold | maintains the position or attitude | position of the said other member arbitrarily. However, it is essential to arrange the adjusting body outside the sewing machine frame 2.
Moreover, although the case where the cam member 52 that is the adjusting body is held at an arbitrary position or an arbitrary posture with respect to the presser lifting lever 47 indirectly connected to the presser member 91 is illustrated, It is good also as a structure hold | maintained in arbitrary positions or arbitrary attitude | positions with respect to the member connected, for example, the rod holder 23 and the pressing support frame 93.

1 Sewing machine 2 Sewing machine frame 3 Sewing needle 4 Pulley 20 Bar support mechanism 40 Press-up mechanism 41 First link member 42 Transmission shaft 43 First arm member 44 Cylindrical member 45 Second arm member 46 Second link member 47 Press Raising lever 48 Lever support shaft (connecting member)
50 Coil spring 51 Third arm member 52 Cam member (adjustment body)
522 Screw hole 523 Woven screw 54 Support shaft 90 Pressing part 91 Pressing member 92 Pressing bar 93 Support frame 94 Bell crank (rotating body)
95 Screw shaft 96 Adjustment nut 97 Spring 100 Presser adjustment mechanism 101 Needle plate 102 Feed dog A Marking point C1 Upper cloth (workpiece)
C2 Lower cloth (sewn product)

Claims (3)

A holding member that holds the workpiece from above,
A pressing bar that supports the pressing member and is supported so as to be vertically movable in the sewing machine frame so that the pressing member moves to the upstream side in the feeding direction as it rises and moves to the downstream side in the feeding direction as it descends. In the sewing machine presser adjustment mechanism,
Directly or indirectly connected to the presser bar, comprising a connecting member capable of moving the presser bar up and down by adjusting the position or posture,
A sewing machine presser adjustment mechanism characterized in that an adjustment body for holding the connecting member in an arbitrary position or an arbitrary posture is provided outside the sewing machine frame.   The presser adjusting mechanism for a sewing machine according to claim 1, wherein the presser bar supports the presser member via a rotating body rotatably supported at a lower end portion thereof. The connecting member is a press-up lever that manually lifts the press-up member upward to release the press-down state of the sewing product,
The presser adjusting mechanism for a sewing machine according to claim 1 or 2, wherein the adjusting body is a cam member that abuts on the presser lifting lever and regulates to an arbitrary rotation angle.

Images