JP2006191951A - Adjustment dial of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously adjust a dial member at the time of adjustment and to surely prevent the turning of the dial member by vibrations. <P>SOLUTION: An adjustment dial of a sewing machine comprises: a slider shaft 12 mounted movably in an axial center direction on a mounting hole 18 at the center part of the dial member 11 and an adjustment shaft 10, and capable of operating an outer end part on the outer surface side of the dial member 11; an engaging pin 13 mounted movably in a radial direction on the adjustment shaft 10, whose inner end part is engaged with the slider shaft 12; a coil spring 19 for energizing the slider shaft 12 to one side in an axial direction; a frictional engagement mechanism 16 for frictionally engaging the engaging pin 13 and a sewing machine frame F when the slider shaft 12 is moved in the energizing direction by the coil spring 19; and an engagement release mechanism 17 for releasing the frictional engagement of the frictional engagement mechanism 16 when the slider shaft 12 is moved in a direction opposing the energizing direction of the coil spring 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an adjustment dial of a sewing machine that converts an adjustment shaft supported by a sewing machine frame and a rotation of a dial member fixed to an outer end portion of the adjustment shaft into an axial movement of the adjustment shaft. It is related with what was comprised so that rotation of the dial member by a vibration could be controlled in steplessly.

  Conventionally, the adjustment dial of the sewing machine is stored with a latch plate with through holes formed in the number of scales in the concave part of the scale dial (dial member) via a spring body. Attached to the hole so that it can move in the axial direction. When not adjusted, the locking pin is fitted into one of the through-holes by the elastic force of the pin push spring to restrict the rotation of the dial member. Has been.

On the other hand, at the time of adjustment, the dial member can be rotated by pushing the dial member toward the sewing machine frame and separating the locking pin from the locking plate. Such an adjustment dial of the sewing machine is applied to adjustment of the cloth feed amount and adjustment of the thread tension.
Japanese Utility Model Publication No. 4-83179

  When this adjustment dial is applied to the adjustment of the cloth feed amount, the dial member can be engaged only at the position of the through-hole formed in the locking plate. Is not limited. Therefore, if the number of through-holes is increased so that the cloth feed amount can be finely adjusted, the dial member becomes larger, so that it is difficult to perform the turning operation.

  When the through hole is not provided in the locking plate, the dial member can be adjusted steplessly, but the dial member cannot be engaged at the desired position, so it may occur due to vibration associated with sewing or operation of the reverse stitching lever. There is a possibility that the dial member is rotated by the vibration. In that case, since the adjusted cloth feed amount is changed, the quality of the sewing product is affected.

  It is an object of the present invention to realize an adjustment dial that can be adjusted steplessly at the time of adjustment in a sewing machine adjustment dial and that the dial member can be reliably prevented from rotating due to vibration, and that has good operability without increasing its size. And so on.

  The adjustment dial of the sewing machine according to claim 1 has an adjustment shaft supported by the sewing machine frame and a dial member fixed to an outer end portion of the adjustment shaft, and the rotation of the dial member is used to move the adjustment shaft in the axial direction. In the adjustment dial of the sewing machine to be converted, a slider shaft that is mounted so as to be movable in the axial direction in a mounting hole in the center portion of the dial member and the adjustment shaft and that can operate an outer end portion on the outer surface side of the dial member; A pin member whose inner end is engaged with the slider shaft, a return urging member for urging the slider shaft toward one side in the axial direction, and the return urging member. A friction engagement mechanism that frictionally engages the pin member and the machine frame or a machine frame-equivalent member when the slider shaft moves in the biasing direction, and the biasing direction of the return biasing member The slider shaft moves in the direction When, characterized by comprising a disengagement mechanism for releasing the frictional engagement of the friction engagement mechanism.

  The adjustment shaft can be frictionally engaged by the friction engagement mechanism to restrict the rotation of the dial member, and the rotation of the dial member due to vibration can be prevented. At the time of adjustment, if the slider shaft is moved in a direction opposite to the urging direction of the return urging member, the frictional engagement is released by the disengagement mechanism, so the dial member is rotated to move the adjustment shaft in the axial direction. The position can be adjusted. After adjustment, when the slider shaft is moved in the urging direction by the return urging member, the adjustment shaft is frictionally engaged with the sewing machine frame or the machine frame equivalent member by the friction engagement mechanism. Be regulated.

According to a second aspect of the present invention, there is provided an adjustment dial for a sewing machine according to the first aspect, wherein the friction engagement mechanism includes an elastic friction member interposed between the pin member and a machine frame or a machine frame equivalent member in a resilient manner. It is characterized by having.
According to a third aspect of the present invention, there is provided the sewing machine adjusting dial according to the first aspect, wherein the disengagement mechanism includes a biasing member that biases the pin member toward the slider shaft.

  According to a fourth aspect of the present invention, there is provided an adjustment dial for a sewing machine according to the first aspect, wherein the return biasing member biases the slider shaft toward the dial member, and the friction engagement mechanism includes the adjustment shaft. And a pin member whose inner end is engaged with the slider shaft, and an elastic friction member interposed between the pin member and a sewing machine frame or a machine frame equivalent member in a resilient manner. The disengagement mechanism includes a small-diameter portion formed on the slider shaft that allows the pin member to enter when the slider shaft is pushed inward, and biases the pin member toward the slider shaft. And a biasing member for releasing the frictional engagement of the frictional engagement mechanism by an inward pushing operation of the slider shaft.

  According to a fifth aspect of the present invention, there is provided the adjusting dial of the sewing machine according to the first aspect of the invention, wherein the friction engagement mechanism moves in a radial direction to the adjusting shaft and a return urging member that urges the slider shaft toward the dial member. This is a link mechanism that connects the inner end of the pin member and the slider shaft, and the inner end of the pin is inserted into the recessed hole of the slider shaft. A link mechanism for converting outward movement of the pin member, and an elastic friction member interposed between the pin member and a sewing machine frame or a machine frame equivalent member, and the disengagement mechanism includes: The friction engagement of the friction engagement mechanism is released via the link mechanism by an inward operation of the slider shaft.

The adjustment dial of the sewing machine according to claim 6 is characterized in that, in the invention of any one of claims 2, 4 and 5, the elastic friction member is made of a rubber member.
According to a seventh aspect of the present invention, there is provided the sewing machine adjusting dial according to any one of the first to sixth aspects, wherein the dial member is a cloth feed adjusting dial member for adjusting a cloth feed amount.

  According to an eighth aspect of the present invention, there is provided a sewing machine adjusting dial according to any one of the first to sixth aspects, wherein the dial member is a thread tension dial member for adjusting a thread tension.

  According to the first aspect of the present invention, when the slider shaft is moved in the urging direction by the slider shaft, the pin member, the return urging member, and the urging member for return, the pin member and the sewing machine frame or machine A friction engagement mechanism that frictionally engages the frame equivalent member and an engagement that releases the friction engagement of the friction engagement mechanism when the slider shaft moves in a direction opposite to the biasing direction of the return biasing member. Since the release mechanism is provided, the adjustment shaft can be frictionally engaged by the friction engagement mechanism to restrict the rotation of the dial member, and the rotation of the dial member due to vibration can be prevented.

  At the time of adjustment, if the slider shaft is moved in a direction opposite to the urging direction of the return urging member, the frictional engagement is released by the disengagement mechanism, so the dial member is rotated to move the adjustment shaft in the axial direction. The position can be adjusted. After adjustment, when the slider shaft is moved in the urging direction by the return urging member, the adjustment shaft is frictionally engaged with the sewing machine frame or the machine frame equivalent member by the friction engagement mechanism. Be regulated. In addition, since the dial member can be frictionally engaged at an adjusted position without providing a locking plate having a through hole, the dial member can be adjusted steplessly. Furthermore, since the dial member is not enlarged, it is easy to rotate.

  According to the second aspect of the present invention, the friction engagement mechanism includes the elastic friction member that is elastically interposed between the pin member and the sewing machine frame or the machine frame equivalent member. It is possible to make the friction engagement with the frame or the machine frame equivalent member more firmly.

  According to the invention of claim 3, since the disengagement mechanism includes the biasing member that biases the pin member toward the slider shaft, the frictional engagement is surely released by the disengagement mechanism during adjustment. be able to.

  According to the invention of claim 4, the return biasing member biases the slider shaft toward the dial member, and the friction engagement mechanism includes the pin member and the elastic friction member, and the engagement is released. Since the mechanism releases the frictional engagement of the frictional engagement mechanism by an inward operation of the slider shaft, the effect similar to that of the first aspect can be obtained.

  According to the fifth aspect of the present invention, the friction engagement mechanism includes a return biasing member, a pin member, a link mechanism, and an elastic friction member, and the engagement release mechanism performs an inward push operation of the slider shaft. Thus, the frictional engagement of the frictional engagement mechanism is released via the link mechanism, so that substantially the same effect as that of the first aspect can be obtained, and the pin member is allowed to enter when the slider shaft is pushed inward. Therefore, it is not necessary to form a small-diameter portion for the slider shaft, and further, since the urging member for urging the pin member toward the slider shaft becomes unnecessary, the configuration of the adjustment dial is simplified.

According to the invention of claim 6, since the elastic friction member is made of a rubber member, it is advantageous in terms of cost to use an inexpensive rubber member.
According to the seventh aspect of the present invention, since the dial member is a cloth feed adjustment dial member for adjusting the cloth feed amount, the cloth feed amount can be adjusted steplessly, and the cloth feed adjustment dial member can be arbitrarily adjusted. Since the friction engagement can be performed at the position, the quality of the sewing product can be improved when the cloth feed adjustment is performed.

  According to the invention of claim 8, since the dial member is a thread tension dial member for adjusting the thread tension, the thread tension can be adjusted steplessly, and at any position where the thread tension dial member is adjusted. Since the friction engagement can be achieved, the quality of the sewn product when the thread tension is adjusted can be improved.

  The adjustment dial of the sewing machine of the present invention has an adjustment shaft supported by the sewing machine frame and a dial member fixed to the outer end portion of the adjustment shaft, and the rotation of the dial member is converted into an axial movement of the adjustment shaft. In the adjustment dial of the sewing machine, the slider member is mounted in the mounting hole in the center of the dial member and the adjustment shaft so as to be movable in the axial direction, and the outer end of the dial member outer surface side can be operated, and the adjustment shaft in the radial direction A pin member whose inner end engages with the slider shaft, a return urging member that urges the slider shaft to one side in the axial direction, and a urging member for urging the slider shaft When the slider shaft moves in a direction opposite to the urging direction of the return urging member and the friction engagement mechanism that frictionally engages the pin member with the machine frame or the machine frame equivalent member when moved in the direction To release the friction engagement of the friction engagement mechanism. Characterized by comprising a disengagement mechanism.

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 is provided with two cloth feed amount adjustment dials 7 and 8 (adjustment dials) and a reverse stitching lever 9 for manually performing reverse stitching. The cloth feed amount adjustment dials 7 and 8 are a normal feed adjustment dial 7 that adjusts a normal cloth feed amount that feeds the work cloth in the forward direction, and a reverse that adjusts a reverse cloth feed amount that feeds the work cloth in the reverse direction. A feed adjustment dial 8;

Next, the cloth feed adjustment dials 7 and 8 will be described with reference to FIGS.
Since the forward feed adjustment dial 7 and the reverse feed adjustment dial 8 have substantially the same configuration, the forward feed adjustment dial 7 will be described here.

  The forward feed adjustment dial 7 includes a metal adjustment shaft 10 supported by the sewing machine frame F, a resin dial member 11 (cloth feed adjustment dial member) fixed to the outer end portion of the adjustment shaft 10, and a dial. A mounting hole 18 provided in the central portion of the member 11 and the adjusting shaft 10, a slider shaft 12 mounted in the mounting hole 18 so as to be movable in the axial direction, and friction for frictionally engaging the adjusting shaft 10 with the machine frame F An engagement mechanism 16, an engagement release mechanism 17 that releases frictional engagement by an inward operation of the slider shaft 12, and a coil spring 19 that urges the slider shaft 12 toward the dial member 11 (return bias) Member).

  Since the dial member 11 and the adjustment shaft 10 are fixed by an adhesive via the connecting member 26, the driving force generated by the rotation of the dial member 11 is transmitted to the adjustment shaft 10, and the rotation of the dial member 11 is controlled by the adjustment shaft. Convert to 10 axial movements. On the outer surface of the dial member 11, there is provided a scale plate 27 in which numerals representing the cloth feed amount are arranged in a circle.

  The adjustment shaft 10 has a hemispherical output portion 10a, a screw shaft portion 10b, a taper shaft portion 10c, a straight shaft portion 10d, and the like, and is fitted to the machine frame F of the pedestal portion 2 in the front-rear direction. The screw shaft portion 10b is screwed into the mating hole Fa and the female screw hole Fb continuous therewith. That is, the forward feed adjustment dial 7 is configured to drive the adjustment shaft 10 back and forth (moving back and forth) by a turning operation by an operator, and the output portion 10a of the adjustment shaft 10 is a cam of a feed adjuster (not shown). By advancing or retreating the output unit 10a in accordance with the rotation operation of the dial member 11, the cloth feed amount by the feed controller (not shown) is changed.

The mounting hole 18 includes a hole 18 a provided in the dial member 11 and a hole 18 b provided in the adjustment shaft 10. The slider shaft 12 has a large-diameter portion 12a, a small-diameter portion 12b, a tapered portion 12c therebetween, and an operation portion 12d for manually pushing operation, and is formed behind the operation portion 12d. A hook-shaped stop ring 25 is externally fitted in the groove (not shown). When the slider shaft 12 is not pushed, the stop ring 25 abuts against the front wall 11a of the dial member 11, so that the slider shaft 12 does not fall off.
Further, the hole 18a is formed with substantially the same size as the stop ring 25, and the hole 18b is formed with substantially the same size as the large diameter portion 12a. Therefore, rattling when the slider shaft 12 is pushed is suppressed, and the movement of the slider shaft 12 in the axial direction is stabilized.

  The friction engagement mechanism 16 includes an engagement pin 13 (pin member) and a rubber member 15 (elastic friction member) provided at an outer end portion of the engagement pin 13, and the slider shaft 12 is urged by a coil spring 19. When moved in the direction, the rubber member 15 and the machine frame F are frictionally engaged via the engagement pin 13. The engaging pin 13 includes a coil spring 14 (biasing member) that urges the engaging pin 13 toward the slider shaft 12 in a pin hole 10e formed in the straight shaft portion 10d of the adjusting shaft 10 and an inner portion (slider). It is mounted so as to be movable in the radial direction of the adjusting shaft 10 via a spring receiving member (not shown) provided in the direction of the shaft 12. The rubber member 15 is elastically interposed between the engagement pin 13 and the engagement hole Fa, and is engaged when the operation portion 12d of the slider shaft 12 is not pushed as shown in FIG. Since the inner end portion of the pin 13 is engaged with the large-diameter portion 12a of the slider shaft 12, the rubber member 15 is pressed against the fitting hole Fa by the outer end portion of the engaging pin 13, and the rubber member 15 is By being compressed, the adjustment shaft 10 is frictionally engaged with the fitting hole Fa.

  Thereby, the rotation of the dial member 11, that is, the movement of the adjustment shaft 10 in the axial direction is restricted. A friction member (machine frame equivalent member) made of synthetic resin or the like may be provided on the surface of the fitting hole Fa of the machine frame F. Thereby, it is possible to make the friction engagement with the fitting hole Fa more firmly.

  The disengagement mechanism 17 is composed of a small-diameter portion 12b of the slider shaft 12 and a coil spring 14. When the slider shaft 12 moves in a direction opposite to the biasing direction of the coil spring 19, the friction engagement mechanism 16 engages with friction. Release the match. When the operation portion 12d of the slider shaft 12 is pushed inward, the small diameter portion 12b is formed so as to allow the engagement pin 13 to enter the direction of the slider shaft 12. As shown, the inner end portion of the engagement pin 13 is engaged with the small diameter portion 12b of the slider shaft 12 by the elastic force generated by the coil spring 14, and the rubber member 15 provided at the outer end portion of the engagement pin 13 is fitted. Since it is separated from the hole Fa, the engagement is released. When the engagement pin 13 is engaged with the upper wall of the engagement hole Fa, when the operation portion 12d of the slider shaft 12 is pushed inward, the engagement pin 13 is caused by its own weight. It can move in the direction of the slider shaft 12.

  Next, operations and effects of the cloth feed adjustment dials 7 and 8 of the sewing machine described above will be described. When adjusting the cloth feed amount with the cloth feed adjustment dials 7 and 8 in the process involving reverse stitching, the operation portion 12d of the slider shaft 12 is pushed inward with a finger so that the small diameter portion 12b of the slider shaft 12 is engaged. When the position facing the pin 13 is reached, a gap is generated between the engagement pin 13 and the slider shaft 12. At this time, the engaging pin 13 is moved in the direction of the slider shaft 12 by the elastic force generated by the coil spring 14 to separate the rubber member 15 from the fitting hole Fa (see FIG. 4). As a result, the frictional engagement between the adjustment shaft 10 and the fitting hole Fa is released, and the dial member 11 can be rotated.

  After the adjustment, when the finger is released from the operation portion 12d of the slider shaft 12, the slider shaft 12 moves to the dial member 11 side by the elastic force generated by the coil spring 19. When the large-diameter portion 12a of the slider shaft 12 reaches a position where it engages with the inner end of the engagement pin 13, the engagement pin 13 moves in the direction of the machine frame F, and the rubber member 15 is moved into the fitting hole Fa. The adjusting shaft 10 is frictionally engaged with the fitting hole Fa by pressing (see FIG. 3). Thereby, rotation of the dial member 11 by vibration can be prevented. In addition, the dial member 11 can be adjusted steplessly because the dial member 11 can be frictionally engaged at any adjusted position without providing a locking plate having a through hole. Furthermore, since the dial member 11 is not enlarged, it is easy to rotate.

Next, a second embodiment of the present invention will be described with reference to FIGS. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described.
In the second embodiment, the configurations of the friction engagement mechanism 16A and the engagement release mechanism 17A of the cloth feed adjustment dials 7A and 8A are changed.

  That is, a link mechanism 20 that connects the inner end portion of the engagement pin 13A and the slider shaft 12A, a coil spring 19 that urges the slider shaft 12A toward the dial member 11, and an adjustment shaft 10 that can be moved in the radial direction. A friction engagement mechanism 16A composed of the engagement pin 13A, a rubber member 15 interposed between the pin member and the fitting hole Fa in a resilient manner, and a dial member of the slider shaft 12A by the link mechanism 20 11A is provided with an engagement release mechanism 17A that converts the movement toward the 11 side into a movement toward the fitting hole Fa of the engagement pin 13A and releases the frictional engagement. The link mechanism 20 corresponds to the disengagement mechanism 17A.

  The slider shaft 12A has a large diameter portion 12f and an operation portion 12g having a smaller diameter than the large diameter portion 12f, and a step portion 12e is provided at a boundary portion between the large diameter portion 12f and the operation portion 12g. The part 12e corresponds to the stop ring 25 of the first embodiment. The slider shaft 12A is formed with a recessed hole 10h communicating with the pin hole 10g of the adjusting shaft 10, and a link mechanism 20 is provided therein. In the link mechanism 20, one end portion of the link member 21 is connected to the peripheral wall of the slider shaft 12A via the connecting shaft 22, and the other end portion of the link member 21 is connected to the inner end portion of the engagement pin 13A via the connecting shaft 23. The inner end portion of the engagement pin 13A enters the recessed hole 10h. The pin hole 10g is formed to be larger than the width of the engagement pin 13A, and enables the link mechanism 20 to move the engagement pin 13A in the radial direction of the adjustment shaft 10A.

  The mounting hole 18A has a hole 18c provided in the dial member 11 and a hole 18d provided in the adjustment shaft 10, and the mounting hole 18A is formed to have substantially the same dimensions as the large-diameter portion 12f of the slider shaft 12A. ing.

  When the operation portion 12g of the slider shaft 12A is pushed inward with a finger, the slider shaft 12A and one end of the link member 21 connected to the peripheral wall of the slider shaft 12A by the connecting shaft 22 are integrally formed in the mounting hole 18A. In order to move in the axial direction, the engaging pin 13A connected to the other end of the link member 21 is pulled in the direction of the slider shaft 12A, thereby separating the rubber member 15 from the fitting hole Fa (see FIG. 7). ). As a result, the frictional engagement between the adjustment shaft 10A and the fitting hole Fa is released, and the dial member 11 can be rotated.

  When the finger is released from the operating portion 12g of the slider shaft 12A after the adjustment, the slider shaft 12A is elastically generated by the coil spring 14, and one end portion of the link member 21 connected to the peripheral wall of the slider shaft 12A by the connecting shaft 22 is connected. In order to move integrally to the dial member 11, the engaging pin 13A connected to the other end of the link member 21 is pressed toward the fitting hole Fa, thereby pressing the rubber member 15 against the fitting hole Fa. Then, the adjusting shaft 10A is frictionally engaged with the fitting hole Fa (see FIG. 5).

  Thus, there is no need to form a small diameter portion on the slider shaft 12A for allowing the engagement pin 13A to enter when the slider shaft 12A is pushed inward, and the engagement pin 13A is further formed on the slider shaft 12A. Since the coil spring for biasing toward the direction becomes unnecessary, the configuration of the cloth feed adjustment dials 7A and 8A is simplified. Other configurations, operations, and effects are the same as those in the above-described embodiment.

Next, a modified example in which the above embodiment is partially modified will be described.
1) In the first embodiment, the engagement release mechanism 17 may be configured to release the frictional engagement by pulling the slider shaft 12 outward. In this case, when the slider shaft 12 is pulled, a small-diameter portion 12b of the slider shaft 12 is provided at a position facing the engagement pin 13, and a coil spring that urges the slider shaft 12 to the side opposite to the dial member 11 is provided. This can be achieved.
2) In the embodiment, without providing the rubber member 15 at the outer end portion of the engaging pins 13 and 13A, the engaging pins 13 and 13A are directly pressed against the fitting hole Fa of the machine frame F or the machine frame equivalent member, and friction is caused. It may be configured to engage.

3) In the first embodiment, the small diameter portion 12b of the slider shaft 12 only needs to be formed at a position facing the engagement pin 13 when the operation portion 12d of the slider shaft 12 is pushed inward. As shown in FIG. 8, the small-diameter portion 12h may be formed only in that portion of the slider shaft 12B, and the other portions may be formed in a large diameter.
4) In the first embodiment, the inner end surface of the engagement pin 13 that engages with the slider shaft 12 may be cylindrical with the same curvature as the slider shaft 12. As a result, the engagement pin 13 and the slider shaft 12 come into surface contact with each other, so that the engagement between the engagement pin 13 and the slider shaft 12 is further strengthened, and the rotation of the dial member 11 due to vibration can be further prevented.

5) The dial member 11 may be applied to other dials provided in the sewing machine M, for example, a dial tensioner dial member for adjusting the thread tension.
6) The dial member 11 and the adjusting shafts 10 and 10A may be integrally formed of, for example, reinforced resin.
7) In addition, those skilled in the art can implement the present invention in various forms with various modifications, and the present invention includes such various modifications.

It is a front view of the staggered sewing machine provided with the adjustment dial of the sewing machine of the present invention. It is a perspective view of a cloth feed adjustment dial. It is a right view of the cloth feed adjustment dial (friction engagement state) attached to the machine frame. It is a right view of the cloth feed adjustment dial (disengaged state) attached to the machine frame. FIG. 4 is a diagram corresponding to FIG. FIG. 6 is a view on arrow VI in FIG. 5. FIG. 6 is a diagram corresponding to FIG. 4 of the second embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of a modified example.

Explanation of symbols

M Staggered sewing machine F Sewing machine frame 7, 7A, 7B, 8, 8A, 8B Cloth feed adjustment dial (adjustment dial)
10, 10A Adjustment shaft 11 Dial member 12, 12A, 12B Slider shaft 12b, 12h Small diameter portion 13, 13A Engagement pin (pin member)
14 Coil spring (biasing member)
15 Rubber member (elastic friction member)
16, 16A Friction engagement mechanism 17, 17A Disengagement mechanism 18, 18A Mounting hole 19 Coil spring (return bias member)
20 Link mechanism

Claims (8)

An adjustment dial of a sewing machine having an adjustment shaft supported by a sewing machine frame and a dial member fixed to an outer end portion of the adjustment shaft, and converting the rotation of the dial member into an axial movement of the adjustment shaft. A slider shaft that is mounted on the mounting hole in the center of the member and the adjustment shaft so as to be movable in the axial direction and that can operate the outer end of the dial member outer surface side;
A pin member mounted on the adjustment shaft so as to be movable in the radial direction and having an inner end engaged with the slider shaft;
A return biasing member that biases the slider shaft toward one side in the axial direction;
A friction engagement mechanism that frictionally engages the pin member and the machine frame or a machine frame equivalent member when the slider shaft is moved in the bias direction by the return bias member;
An engagement release mechanism for releasing the friction engagement of the friction engagement mechanism when the slider shaft moves in a direction opposite to the urging direction of the return urging member;
Sewing machine adjustment dial characterized by comprising   2. The sewing machine adjustment dial according to claim 1, wherein the friction engagement mechanism includes an elastic friction member elastically interposed between a pin member and a sewing machine frame or a machine frame equivalent member. .   The sewing machine adjustment dial according to claim 1, wherein the disengagement mechanism includes a biasing member that biases the pin member toward the slider shaft. The return biasing member biases the slider shaft toward the dial member,
The friction engagement mechanism includes a pin member that is mounted on the adjustment shaft so as to be movable in the radial direction and whose inner end engages with the slider shaft, and an elastic pressure between the pin member and a machine frame or a machine frame equivalent member. An elastic friction member interposed in a shape,
The disengagement mechanism includes a small-diameter portion that is formed on the slider shaft and allows the pin member to enter when the slider shaft is pushed inward, and a biasing member that biases the pin member toward the slider shaft The sewing machine adjustment dial according to claim 1, wherein the friction engagement of the friction engagement mechanism is released by an inward operation of the slider shaft. The friction engagement mechanism is mounted on a return biasing member for biasing the slider shaft toward the dial member, and is mounted on the adjustment shaft so as to be movable in the radial direction, and an inner end portion enters a recessed hole of the slider shaft. A pin mechanism, a link mechanism for connecting the inner end of the pin member and the slider shaft, the link mechanism for converting the movement of the slider shaft toward the dial member to the outward movement of the pin member, and the pin member And an elastic friction member interposed between the sewing machine frame or the machine frame equivalent member in an elastic manner,
2. The sewing machine according to claim 1, wherein the disengagement mechanism releases the frictional engagement of the frictional engagement mechanism via the link mechanism by an inward operation of the slider shaft. Adjustment dial.   6. The sewing machine adjusting dial according to claim 2, wherein the elastic friction member is made of a rubber member.   The adjustment dial according to claim 1, wherein the dial member is a cloth feed adjustment dial member for adjusting a cloth feed amount.   7. The sewing machine adjusting dial according to claim 1, wherein the dial member is a thread tension dial member for adjusting a thread tension.

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