JP4455175B2 - Sewing machine opener - Google Patents

Description

The present invention relates to openers of the horizontal rotary hook of a sewing machine.

The conventional horizontal hook of the sewing machine is arranged below the needle plate, captures the upper thread passed through the sewing needle, forms a loop, and inserts the lower thread into the upper thread loop to entangle these threads. Plays a function.
Such a horizontal hook is provided with a sword for catching an upper thread on the outer periphery thereof, and an outer hook that is rotationally driven around the vertical direction, and a bobbin that is supported on the upper part of the outer hook and that supplies a lower thread. With a kettle.
The outer hook is driven to rotate at a double speed with respect to the sewing machine main shaft by a hook shaft arranged vertically at the bottom thereof, so that the upper thread loop can be captured by the sword tip and the inner hook can be passed.
On the other hand, the inner hook is provided with an inner hook protrusion on the upper side in the radial direction, and is provided on the lower side of the needle plate at the upstream side and the downstream side in the rotational direction of the inner hook protrusion. The inner hook is prevented from rotating with the outer hook by being loosely inserted between the two restraining projections.
In such a horizontal hook, since the inner hook receives a rotational force as the outer hook rotates, the inner hook protrusion comes into contact with a stop protrusion on the downstream side in the rotation direction. However, if this state is maintained, it becomes difficult for the upper thread passing through the inner hook to pass between the intermediate hook protrusion and the downstream-side regulating protrusion, and the lower thread cannot be smoothly inserted into the upper thread loop. For this reason, the sewing machine is provided with an opener for separating the inner hook protrusion and the downstream restriction protrusion at the predetermined rotational phase of the outer hook.

The opener includes a swing arm member supported by the shuttle shaft via an eccentric cam, an engagement claw member supported by the swing end of the swing arm member and engaging with the outer peripheral protrusion of the inner shuttle, A link body for maintaining the posture of the swing arm member having one end connected to the middle of the swing arm member and the other end connected to the sewing machine frame is provided (for example, see Patent Document 1).
In such an opener, the swing arm member is given a circular motion by an eccentric cam at the base end portion thereof, and the movement of the swing arm member is restricted to a circular arc locus having the radius of the link body by the link body at the intermediate portion thereof. An elliptical motion is imparted to the engaging claw member at the swing end. Then, by rotating the inner hook by the amount of displacement in the short axis direction in the elliptical movement of the engaging claw member, a gap based on the rotation is generated between the middle hook protrusion and the downstream-side regulating protrusion, whereby the upper thread Smooth passage is possible.
JP-A-11-114264

By the way, the amount of gap generated between the hook hook protrusion and the downstream restricting protrusion is used for machine maintenance, to correspond to the thickness of the upper thread, or to compensate for differences in processing accuracy and assembly accuracy of each part. There is a need to adjust to do. As such an adjustment method, it is conceivable to adjust by inserting a gap gauge between the inner hook projection and the downstream regulation projection.
However, it has been very difficult to insert a clearance gauge between the inner hook projection and the downstream regulating projection arranged in a narrow space on the back side of the needle plate.
An object of the present invention is to easily adjust the amount of clearance between the inner hook protrusion and the restriction protrusion on the throat plate side.

The invention according to claim 1 is provided on the side of the sewing machine frame that comes into contact with the inner hook projection from the downstream side in the interlocking rotation direction and the inner hook projection for restricting the interlocking rotation with the outer hook provided on the inner hook of the horizontal sewing hook of the sewing machine. The sewing machine horizontal shuttle opener that forms a gap in synchronization with the rotation of the outer hook, and that has a sewing machine frame that manually rotates the drive shaft that rotationally drives the outer hook. The pulley provided on the outside and the tip part moves along an elliptical locus according to the rotational phase of the drive shaft, and the tip part is engaged with the engaged part provided on the inner hook in at least a part of the elliptical locus. The engaging member that pulls the inner hook in the reverse rotation direction to the outer hook and the distal end of the engaging member from the drive shaft via the eccentric cam are moved according to an elliptical locus, and the engaging member is held to be adjustable. The transmission mechanism and the rotational phase of the drive shaft are engaged by the tip of the engagement member. And an indicator means for displaying an operation position by the pulley for adjusting to an engagement start phase for forming a gap having a target width via the section, and the transmission mechanism includes an eccentric cam fixed to the drive shaft, An arm member connected to the drive shaft via an eccentric cam at one end and supporting the base end of the engaging member at the other end, and one end rotatably supported by the sewing machine frame and the other end A link member rotatably connected to an intermediate position of the arm member, and the arm member holds the engagement member so as to be movable and adjustable along the short axis direction of the elliptical locus. A configuration is adopted in which the inner hook is pushed and rotated in the direction opposite to the outer hook by engaging with the engaged portion by the relative movement of the elliptical locus in one of the short axis directions .

The above-described opener rotates the inner hook slightly in the direction opposite to the outer hook to separate the inner hook protrusion from the restricting contact portion to form a gap. In the following description, forming the gap by separating the hook protrusion from the restricting contact portion is referred to as “opening the hook protrusion”, and the width of the gap is referred to as “opening amount”.
In the above configuration, the opening mechanism is operated in synchronization with the rotation of the outer hook by causing the engaging member to open the inner hook protrusion on the engaging member by the eccentric cam from the drive shaft that rotationally drives the outer hook. The “drive shaft” referred to here includes not only a hook shaft that is directly connected to the outer hook and rotationally drives the outer hook, but also an axis that rotates in synchronization with the hook shaft. Further, “synchronously rotating” includes rotation at an integral multiple and rotation at an inverse multiple of an integer (1/2, 1/3,...) In addition to the rotation at the same speed.

Then, in synchronization with the rotation of the drive shaft, since the front end portion of the engaging member to move to draw an elliptical path by the transmission mechanism, the phase of the drive shaft, the tip portion of the engaging member on the elliptical locus either Can be specified.
Then, the elliptical trajectory can be obtained from, for example, the dimensions and positional relationships of the components of the transmission mechanism, and if the trajectory is known, the position of the tip of the engagement member on the elliptical trajectory is specified, By moving along the elliptical locus from the position of the tip, it is possible to determine how much distance the inner hook can be drawn through the engaged portion.
That is, the position of the front end portion of the engagement member on the elliptical locus can be specified from the phase of the drive shaft, and the opening amount of the hook protrusion is obtained when the position of the front end portion of the engagement member is the initial position. Can do.

As described above, when the phase of the initial position of the distal end portion of the engaging member is specified, the opening amount can be specified.
From this point of view, the phase difference of the drive shaft is aligned with the phase of the initial position corresponding to the desired amount of opening, and the opening amount is set so that the inner hook protrusion is in contact with the regulating contact portion located downstream in the outer hook rotation direction. In this state, the engagement member is moved and adjusted to the engagement start position with the engaged portion and fixed to the transmission mechanism.
As a result, the position of the tip of the engaging member is set as the initial position, and the tip of the engaging member starts moving according to the elliptical locus from a predetermined position on the elliptical locus corresponding to the predetermined phase. The hook protrusion can be opened from the restricting contact portion with an opening amount corresponding to a phase preset in the drive shaft.

Further , at the time of phase alignment of the drive shaft described above, the drive shaft is rotated by a pulley . During such an operation, the phase of the drive shaft is adjusted while referring to the operation position displayed by the indicator means.

The invention described in claim 2 has a configuration similar to that of the invention described in claim 1 , and the indicator means displays the operation position individually according to a plurality of target widths.
In the above configuration, an arbitrary width is selected from the plurality, and phase alignment of the drive shaft is performed while referring to the operation position displayed by the indicator means.

In the first aspect of the present invention, the driving shaft is aligned with the phase for rotating the inner hook by a desired opening amount, and the distal end portion of the engaging member is engaged while the inner hook protrusion is in contact with the restricting contact portion. By adjusting the position of the engaging member so as to be in contact with the portion, it is possible to easily and quickly adjust the hook projection so as to be opened with a desired opening amount without using a gap gauge or the like.
Further, when the drive shaft is adjusted to a predetermined phase, the indicator means displays the operation position of the pulley for adjusting the drive shaft to the phase having the desired opening amount. It is possible to adjust the protrusion so that the protrusion is opened with a desired opening amount.

In the invention according to claim 2 , since the operation position is individually displayed according to the plurality of widths targeted by the index means, a plurality of widths (opening amounts) are selected, and each width is easily and quickly. It is possible to adjust the hook projection to open.

(Horizontal hook of sewing machine)
An opener 10 of a sewing machine horizontal hook 50 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 are plan views of the sewing machine horizontal hook 50 and the opener 10, and FIG. 3 is a front view of the sewing machine horizontal hook 50 and the opener 10.
The sewing machine horizontal hook 50 is provided below the needle plate 80 of the sewing machine, and forms a loop by supplementing the upper thread from the sewing needle inserted into the needle hole of the needle plate 80 at the time of sewing and loops the lower thread on the upper thread loop. It has a function to pass through.
The sewing machine horizontal hook 50 has, as shown in FIGS. 1 to 3, an inner hook 60 for storing a bobbin (not shown) for supplying a lower thread when sewing the sewing machine, And an outer hook 70 which is driven to rotate with respect to 60 and allows the inner hook 60 to pass through the upper thread loop by a sword tip 71 provided on the outer periphery.
Here, the sewing machine horizontal hook 50 is mounted inside the sewing machine so that the rotation center line of the outer hook 70 is along the vertical vertical direction in a state where the sewing machine is installed on a horizontal plane.

The outer pot 70 has a substantially cylindrical shape as a whole, and is driven to rotate about the center line of the cylindrical shape. That is, the outer hook 70 is closed at the bottom side, and a hook shaft 72 for driving the outer hook 70 to be concentric is fixedly connected to the bottom surface of the outer hook 70. The shuttle shaft 72 is supported in the sewing machine frame so as to be vertical when the sewing machine is installed on a horizontal plane, and a rotational driving force by a known transmission mechanism from a sewing machine main shaft as a driving shaft for moving the sewing needle up and down. Is transmitted. Such a transmission mechanism rotationally drives the shuttle shaft 72 at a rotational speed that is twice the rotational speed of the sewing machine main shaft. That is, the outer hook 70 is driven to rotate at a rotational speed that is twice the frequency of the vertical movement of the sewing needle.
Further, a sword tip 71 extends outwardly from the circumferential direction on the outer peripheral surface of the outer hook 70, and the locus of the tip of the sword tip 71 passes slightly away from the needle drop position of the sewing needle. Is set to Thereby, the upper thread can be captured from the sewing needle at the sword tip 71 by the rotation of the outer hook 70.
The outer hook 70 is driven to rotate in the extending direction of the sword tip 71 (the clockwise direction in FIGS. 1 and 2).

  The inner hook 60 is stored in the outer hook 70 with the upper portion of the inner hook 60 exposed from the opened upper portion of the outer hook 70. The inner hook 60 is stored in a state of being rotatable with respect to the outer hook 70, and an upper hook protrusion 61 for restricting the interlocking rotation with the outer hook 70 toward the outer side in the radial direction of the inner hook 60 at the upper portion thereof. It is extended. On the other hand, a throat plate projection 81, 82 as a pair of restricting contact portions is provided on the lower surface side of the throat plate 80, and the hook projection 61 is located between the two throat plate projections 81, 82. Are loosely fitted. The two throat plate protrusions 81 and 82 are provided at a wider interval than the width of the inner hook protrusion 61, and one throat plate protrusion 81 is located downstream of the inner hook protrusion 61 in the rotational direction of the outer hook 70. The other throat plate protrusion 82 is positioned upstream of the inner hook protrusion 61 in the rotational direction of the outer hook 70. That is, the inner hook 60 can slightly swing in the gap in a state where the inner hook protrusion 61 is loosely fitted between the pair of needle plate protrusions 81 and 82. Further, when the outer hook 70 is driven to rotate, the inner hook 60 receives the rotational driving force from the outer hook 70, so that the state where the inner hook protrusion 61 is in contact with the needle plate protrusion 81 is maintained (the state shown in FIG. 1). ).

(Overall configuration of opener)
The opener 10 creates a gap in synchronization with the rotation of the outer hook 70 between the above-described middle hook protrusion 61 of the sewing machine horizontal hook 50 and the needle plate protrusion 81 that contacts the hook hook protrusion 61 from the downstream side in the interlocking rotation direction. It is for forming.
The opener 10 includes a pulley 11 as an operating means provided outside a sewing machine frame for manually rotating a sewing machine main shaft for rotating the outer hook 70 via the hook shaft 72, and a rotation phase of the sewing machine main shaft. The distal end portion moves along a predetermined locus, and the distal end portion engages with an engagement protrusion 62 as an engaged portion provided in the inner hook 60 in at least a part of the locus, and the interlocking rotation by the outer hook 70 is performed. The front end of the engagement member 20 is moved along the elliptical locus D via the eccentric cam 31 from the engagement member 20 that pulls the inner hook 60 in the opposite direction to the sewing machine main shaft and the hook shaft 72 that is interlocked with the sewing machine main shaft. The rotation mechanism of the transmission mechanism 30 that holds the engagement member 20 so that the movement of the engagement member 20 can be adjusted along the rotation phase of the sewing machine main shaft so that the front end portion of the engagement member 20 forms a gap with a target width via the engagement protrusion 62. Engagement start For aligning the phase, and a reference marks display unit 40 as an indicator means for displaying the operating position by the pulley 11.

(Transmission mechanism)
The transmission mechanism 30 has an eccentric cam 31 fixedly mounted on the upper portion of the hook shaft 72, and is connected to the hook shaft 72 via the eccentric cam 31 at one end portion and a base end portion of the engaging member 20 at the other end portion. An arm member 32 to be supported, and a link member 33 having one end rotatably supported by the sewing machine frame and the other end rotatably coupled to an intermediate position of the arm member 32 are provided.
Since one end portion of the arm member 32 is connected to the shuttle shaft 72 via the eccentric cam 31, the one end portion performs a circular motion according to the eccentric amount of the eccentric cam 31 at the same rotational speed as the outer hook 70. Will be done. Further, since the arm member 32 is connected to the link member 33 at an intermediate position in the longitudinal direction, the connection point of the arm member 32 with the link member 33 is centered on the end of the link member 33 on the sewing machine frame side. It is restricted to move along an arcuate locus.

Thus, as a result of the arm member 32 performing a circular motion along the circumference at one point and moving along the arc at the other point, the distal end portion 21 of the engagement member 20 supported by the arm member 32 is A circular motion is drawn while drawing an elliptical locus D. FIG. 4 is an explanatory diagram illustrating an elliptical locus D that is a movement locus of the distal end portion 21 of the engaging member 20.
Since the arm member 32 is given rotational movement from the eccentric cam 31, the distal end portion of the engaging member 20 performs elliptical circular movement in the clockwise direction in FIGS. .
Further, the short axis direction S of the arc motion of the distal end portion 21 of the engagement member 20 is substantially along the longitudinal direction of the link member 32 and is engaged to separate the hook projection 61 from the needle plate projection 81. The member 20 generally coincides with the direction in which the engaging protrusion 62 is moved. The major axis direction L of the elliptical locus D is generally along the surface 62a of the engagement protrusion 62 with which the distal end portion 21 of the engagement member 20 abuts.
For this reason, the engagement member 20 applies a minute displacement to the inner hook 60 according to the minor axis direction S of the elliptical locus, and allows the inner hook protrusion 61 to be separated from the needle plate protrusion 81 by a minute distance and the long axis. The inner hook protrusion 61 and the throat plate protrusion 81 are separated from each other for a long time by bringing the tip 21 of the engagement member 20 into contact with the contact surface 62a of the engagement protrusion 62 along a long movement locus along the direction L. Can be made.

(Engagement member)
The engaging member 20 has a long hole 22 formed at the base end portion thereof, and is fixed to the distal end portion of the arm member 32 by fastening a set screw 23 passed through the long hole 22. The engaging member 20 can be adjusted in position along the longitudinal direction of the elongated hole 22 with respect to the arm member 32. Further, the engaging member 20 is supported so that the longitudinal direction of the long hole 22 is substantially along the short axis direction S in the elliptical locus D of the circular motion provided by the transmission mechanism 30.
As described above, the engagement member 20 is supported by the arm member 32 so that the movement of the engagement member 20 can be adjusted along the elongated hole 22, so that the elliptical locus D of the distal end portion 21 of the engagement member 20 is also in the short axis direction S and the long axis. It is possible to move along the longitudinal direction of the long hole 22 while maintaining the direction L in a certain direction.
On the other hand, at which point on the elliptical locus D the tip 21 of the engaging member 20 is located is determined by the rotational phase of the shuttle shaft 72 and the sewing machine main shaft.
For example, as shown in FIG. 4, when the predetermined phase of the sewing machine main shaft is 0 ° and the phase of the sewing machine main shaft is θ °, the tip 21 of the engagement member 20 is always shown on the elliptical locus D. Position. When the distal end portion 21 of the engaging member 20 contacts the engaging protrusion 62 for the first time at the illustrated position, the engaging member 20 moves the engaging protrusion 62 of the inner hook 60 by the distance H in one rotation of the outer hook 70. It will be moved. That is, when the phase θ of the sewing machine main shaft that starts the contact with the engagement protrusion 62 is determined, the rotation amount applied to the inner hook 60 can be uniquely determined. Yes. That is, by adjusting the phase θ of the sewing machine main shaft at which the engagement member 20 starts to come into contact with the engagement protrusion 62, a distance (hereinafter referred to as an opening amount) for separating the inner hook protrusion 61 from the needle plate protrusion 81 is adjusted. Settings can be adjusted.

(Pulley)
FIG. 5 is a perspective view of a sewing machine on which the opener 10 is mounted.
The above-described sewing machine main shaft that applies rotational driving force to the shuttle shaft 72 that rotationally drives the outer hook 70 is connected to the pulley 11 provided outside the sewing machine frame in the vertical machine body of the sewing machine. The sewing machine main shaft is rotationally driven by the sewing machine motor, but when the sewing machine motor is not driven, a manual rotation operation can be input by the pulley 11. That is, the pulley 11 can adjust the sewing machine main shaft to an arbitrary phase.

(Signature display area and opening adjustment method)
As described above, by adjusting the phase θ of the sewing machine main shaft at which the engaging member 20 starts to come into contact with the engaging protrusion 62, the opening amount of the inner hook protrusion 61 and the needle plate protrusion 81 is set and adjusted. Is possible.
Therefore, in order to adjust the opening amount, first, the main shaft of the sewing machine is adjusted to the phase corresponding to the target opening amount of the hook hook protrusion 61 and the needle plate protrusion 81 by the pulley 11 (phase setting step).
Then, the hook hook protrusion 61 is brought into contact with the needle plate protrusion 81 (state in FIG. 1: hook hook positioning step). Note that such an inner hook positioning step may be performed prior to or simultaneously with the phase setting step.
Then, in a state where the set screw 23 has been loosened in advance, the engagement member 20 is positioned so that the distal end portion 21 of the engagement member 20 contacts the engagement protrusion 62, and the distal end portion of the arm member 32 is secured by the set screw 23. Fix (engagement member position adjustment step).
By adjusting the position of the engaging member 20 in the above steps, the tip end portion 21 of the engaging member 20 draws a predetermined elliptical locus D at the same rotational speed as that of the outer hook 70 when the sewing machine motor is driven, and a predetermined phase is reached. In this case, the inner hook 60 can be rotated in the opposite direction to the outer hook 70 so that the distal end portion 21 of the engaging member 20 abuts on the engaging protrusion 62 and reaches a target opening amount.
Further, the scale may be provided on the sewing machine frame and the reference arrow may be provided on the pulley.

The mark display unit 40 is a display attached to the peripheral surface of the pulley 11, and a plurality of unit distances from 0 to the maximum opening amount (short axis length of the elliptical locus D) in the phase setting step described above. Is composed of a scale 41 for aligning the sewing machine spindle with each phase corresponding to the above and a reference arrow 42 attached to the surface of the machine frame indicating the position where the scale 41 should be aligned.
That is, the engaging member position adjusting step can be easily performed by rotating the pulley 11 so that the scale 41 corresponding to the target opening amount matches the position of the reference arrow 42.
The phase for determining each opening amount of the scale 41, the size of the elliptical locus D, and the like can be obtained in advance by numerical calculation from the dimensions, relative positional relationship, and distance of each component of the transmission mechanism 30. is there.

(Explanation of operation of horizontal hook and opener)
When the horizontal hook 50 is sewn, the outer hook 70 is rotationally driven at a double speed of the sewing machine main shaft in synchronization with the vertical movement of the sewing needle of the sewing machine. As a result, the outer hook 70 rotates, and the sword tip 71 captures the upper thread from the lowered sewing needle. The upper thread that has been caught and formed with a loop passes under the inner hook 60 by the rotating sword tip 71 and passes through the inner hook 60.
In the opener 10, the distal end portion 21 of the engaging member 20 moves around in the same rotational direction as the outer hook 70 by drawing the elliptical locus D by the movement of the arm member 32 of the transmission mechanism 30, and has a predetermined phase. , The center hook protrusion 61 is opened with respect to the throat plate protrusion 81 by an opening amount set and adjusted in advance, and the upper thread passes between them. Further, when the distal end portion 21 of the engagement member 20 further moves, the engagement state with the engagement projection 62 is released, and the upper thread passes between the distal end portion 21 of the engagement member 20 and the engagement projection 62. . As a result, the upper thread completely passes through the inner hook 60, and the lower thread is inserted into the loop.
Then, the thread reeling is performed every time the sewing needle moves up and down, and sewing is performed.

(Effect of embodiment)
As described above, the opener 10 moves the inner end of the engagement member 20 along the elliptical trajectory D according to the change in the phase of the main spindle of the sewing machine, so that the opener 10 can move by a desired opening amount. The sewing machine main shaft is aligned with the phase for rotating 60, and the position of the engagement member 20 is adjusted so that the tip 21 of the engagement member 20 contacts the engagement protrusion 62 in a state where the inner hook protrusion 61 contacts the needle plate protrusion 81. By doing so, it is possible to easily and quickly adjust the hook projection 61 so that it opens with a desired opening amount without using a gap gauge or the like.
Further, when the sewing machine main shaft is adjusted to a predetermined phase, the alignment display unit 40 displays the operation position of the pulley 11 for adjusting the sewing machine main shaft to a phase having a desired opening amount. In addition, it is possible to adjust the inner hook projection to open with a desired opening amount.
Further, since the sign display unit 40 individually displays the operation position according to a plurality of opening amounts, an arbitrary opening amount is selected, and the inner hook protrusion 61 is opened easily and quickly for each opening amount. It is possible to adjust so that
Since the main shaft only needs to have a predetermined phase, the alignment display portion can be provided at various parts such as the sewing machine main shaft itself or the belt cover of the sewing machine.

It is a top view of a sewing machine horizontal shuttle and an opener, Comprising: The state in which the inner hook protrusion is contacting the throat plate protrusion is shown. It is a top view of a sewing machine horizontal shuttle and an opener, Comprising: The state in which a center hook protrusion is spaced apart from a throat plate protrusion is shown. It is a front view of a sewing machine horizontal hook and an opener. It is explanatory drawing which illustrated the elliptical locus | trajectory which is a movement locus | trajectory of the front-end | tip part of an engaging member. It is a perspective view of a sewing machine carrying an opener. It is explanatory drawing which shows the influence of the opening amount with respect to the engagement protrusion which produced the position error.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Opener 11 Pulley 30 Transmission mechanism 31 Eccentric cam 32 Arm member 40 Joint display part (index means)
50 Sewing machine horizontal hook 60 Center hook 61 Center hook protrusion 62 Engaging protrusion (engaged part)
70 outer hook 71 sword tip 72 hook shaft (drive shaft)
80 Needle plate 81 Needle plate projection (regulating contact)
82 Needle plate projection D elliptical trajectory

Claims (2)

Middle hook protrusion for interlocking rotation restriction with the outer hook provided in the inner hook of the horizontal sewing machine, and a contact portion for restriction provided on the machine frame side that contacts the inner hook protrusion from the downstream side in the interlocking rotation direction. A sewing machine horizontal hook opener that forms a gap in synchronization with the rotation of the outer hook,
A pulley provided outside the sewing machine frame for manually rotating the drive shaft for rotating the outer hook;
The tip moves in an elliptical locus in accordance with the rotational phase of the drive shaft, and the tip engages with an engaged portion provided in the inner hook in at least a part of the elliptical locus. An engaging member for pulling the inner hook in the reverse direction of the hook;
A transmission mechanism that moves the tip of the engagement member from the drive shaft via an eccentric cam according to the elliptical locus , and holds the engagement member so that the movement of the engagement member can be adjusted;
An operation position by the pulley for adjusting a rotation phase of the drive shaft to an engagement start phase for forming a gap having a target width through the engaged portion by the distal end portion of the engagement member. An indicator means for displaying ,
The transmission mechanism includes an eccentric cam fixed to the drive shaft, and an arm connected to the drive shaft via the eccentric cam at one end and supporting the base end of the engagement member at the other end. A member, and a link member that is rotatably supported at one end by a sewing machine frame and is rotatably connected to an intermediate position of the arm member by the other end.
The arm member holds the engagement member so as to be movable along the minor axis direction of the elliptical locus,
The engaging member engages with the engaged portion by relative movement in one of the short axis directions of the elliptical locus and pushes the inner hook in a reverse rotation direction with respect to the outer hook. Sewing machine horizontal pot opener. The index means, the sewing machine horizontal hook according to claim 1, wherein the displaying the operation position individually according to a plurality of width a target opener.

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