JP2000176189A - Mechanism for suppressing vibration of reverse stitching lever of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism for suppressing vibration of a reverse stitching lever of a sewing machine in which vibration transmitted to the lever can be assuredly suppressed and a vibration suppressing effect can be achieved with a simple structure without deteriorating the operability of the lever. SOLUTION: A connecting mechanism 60 for connecting a reverse stitching lever shaft 50 to a reverse stitching lever 55 comprises a rotating and connecting part 61 for rotatably connecting these members 50 and 55 together and lever guides 62 fixed to the reverse stitching lever shaft 50. A pair of buffer rubber members 71 of a reverse stitching lever vibration suppressing mechanism 70 are fixed to a pair of regulating parts 64 of the lever guides 62 located at both sides in the rotating direction of the base end part of the reverse stitching lever shaft 50. When the reverse stitching lever 55 is rotated, the rotating operation is transmitted to the lever shaft 50 through the buffer rubber members 71 and the lever guides 62. Thus, vibration transmitted to the reverse stitching lever 55 through a feed regulation mechanism and the reverse stitching lever shaft 50 from a feed driving mechanism is suppressed by the buffer rubber members 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a return stitch lever vibration suppression mechanism of a sewing machine that suppresses vibration transmitted from a feed drive mechanism of a feed dog to a return stitch lever via a feed adjustment mechanism and a return stitch lever shaft.

[0002]

2. Description of the Related Art Conventionally, in a sewing machine having a feed drive mechanism for feeding and driving a feed dog and a feed adjustment mechanism capable of switching a feed direction of the feed dog, the feed adjustment mechanism is mechanically connected to the feed drive mechanism. The reverse feed stitch lever shaft is interlocked and connected to the feed adjuster, and the operator rotates the reverse stitch lever shaft by holding the reverse stitch lever connected to the reverse stitch lever shaft by hand. There is a configuration in which a feed adjuster is rotated via a switch to switch a feed direction of a feed dog.

In the feed direction switching device (see Japanese Patent Publication No. 59-30438) filed by the present applicant, a feed adjuster has a forward feed control surface and a reverse feed control surface, and forward feed is performed on an adjustment shaft of a feed adjustment dial. When the control surface is engaged, the feed dog can be forwardly fed, and when the reverse feed control surface is engaged with the adjustment shaft, the feed dog can be reversely fed. Normally, when the reverse stitch lever is not operated, the reverse stitch lever and the feed adjuster are biased to rotate to the forward position.

When the operator turns the reverse stitch lever against the biasing force, the reverse stitch lever and the feed adjuster are switched to the reverse feed position, and the reverse feed control surface of the feed adjuster is engaged with the adjustment shaft. I do. In fact, during operation of the feed drive mechanism, the operator holds the reverse stitch lever (feed adjuster) at the reverse feed position, whereby the reverse feed control surface of the feed adjuster is kept engaged with the adjustment shaft, It is possible to reverse the teeth. Also, when the operator releases the reverse sewing lever, the reverse sewing lever and the feed adjuster are rotated by the rotational urging force and switched to the normal feed position, and the normal feed control surface of the feed adjuster is engaged with the adjustment shaft. .

[0005] By the way, many sewing machines of this type have a reverse stitch lever shaft and a reverse stitch lever directly fixedly connected. For example, in a sewing machine put to practical use by the present applicant, as shown in FIGS. 12 and 13, the end of a reverse stitch lever shaft 100 is internally fitted into the base end portion of a reverse stitch lever 102 having an operation portion 102a. The tip end of a set screw 103 screwed into 101 is engaged with an axially long V-groove 101 formed in the reverse stitch lever shaft 100, and further presses against the reverse stitch lever shaft 100, and contacts the reverse stitch lever shaft 100. The reverse sewing lever 102 is directly fixed.

[0006]

In the conventional structure in which the reverse feed stitch lever shaft and the reverse feed stitch lever are directly fixed and connected, the vibration caused by the operation of the feed adjustment mechanism is transmitted from the feed drive mechanism via the feed adjustment mechanism and the reverse feed stitch lever shaft. Since it is transmitted directly to the reverse feed stitch lever, when the operator operates the reverse feed stitch lever by hand to reverse feed the feed dog,
In particular, when the sewing machine (feed drive mechanism) operates at a high speed, there is a problem that vibration transmitted to the reverse stitch lever is uncomfortable.

Conventionally, in order to suppress the vibration transmitted to the reverse feed stitch lever, it has been necessary to take some measures to suppress the vibration. However, the structure for this purpose has been improved by using a reverse feed stitch lever shaft to operate the feed adjuster without delay. It has been difficult to provide such a structure that the operability of the rotating reverse stitch lever to be rotated is not impaired, or it is advantageous in terms of manufacturing cost without complicating the structure, and almost no vibration suppression measures have been taken. is the current situation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reverse stitch lever for a sewing machine in which vibration transmitted to a reverse stitch lever can be reliably suppressed, and its vibration suppressing effect can be achieved with a simple structure without impairing the operability of the reverse stitch lever. It is to provide a vibration suppression mechanism.

[0009]

According to a first aspect of the present invention, there is provided a reverse stitch lever vibration suppressing mechanism for a sewing machine, comprising: a feed drive mechanism for feeding and driving a feed dog; and a feed adjuster mechanically connected to the feed drive mechanism. And a feed adjusting mechanism capable of switching the feed direction of the feed dog by rotating the feed adjuster. In the sewing machine, a reverse feed stitch lever shaft interlocked to the feed adjuster and a reverse feed stitch lever shaft are provided. The coupling mechanism that connects the reverse stitch lever for rotating the feed adjuster is provided with a buffer rubber member that suppresses vibration transmitted from the feed drive mechanism to the reverse stitch lever via the feed adjustment mechanism and the reverse stitch lever shaft. It is assumed that.

When the reverse stitch lever is rotated, the reverse stitch lever shaft is rotated via the connecting mechanism, and the feed adjuster of the feed adjusting mechanism is rotated in conjunction therewith, thereby switching the feed direction of the feed dog. The vibration caused by the operation of the feed drive mechanism is transmitted from the feed drive mechanism to the feed stitch lever via the feed adjusting mechanism and the feed stitch lever shaft. Even when the sewing machine (feed drive mechanism) is operating at high speed, the vibration is transmitted to the coupling mechanism. Can be greatly reduced and suppressed by the cushioning rubber member of the reverse stitch lever vibration suppression mechanism provided in the present invention, thereby eliminating the problem that the operator operating the reverse stitch lever feels uncomfortable with the vibration transmitted to the reverse stitch lever. it can.

Here, usually, in a state where the operator does not operate the reverse stitch lever, the reverse stitch lever and the feed adjuster are urged to rotate to the normal feed position to be in a state where the feed dog can be forward-forwarded. When the reverse stitch lever is operated to rotate against the rotational urging force, the reverse stitch lever and the feed adjuster are switched to the reverse feed position, so that the feed dog can be reversely fed. In fact, during operation of the feed drive mechanism, the operator can reverse feed the feed dog by holding the reverse stitch lever (feed adjuster) at the reverse feed position.
At this time, the vibration transmitted to the reverse stitch lever is suppressed by the cushioning rubber member, and an effect that the operator does not feel uncomfortable with the vibration is exerted.

Here, the rotation operation of the reverse stitch lever can be transmitted to the reverse stitch lever shaft via the buffer rubber member. This makes it possible to reliably suppress the vibration transmitted to the reverse feed stitch lever, and to reduce the vibration so as not to impair the operability of the reverse feed stitch lever that surely rotates the feed adjuster without operation delay via the reverse feed stitch lever shaft. Can be achieved.

According to a second aspect of the present invention, in the second aspect, the connecting mechanism comprises:
A rotation connecting portion that rotatably connects the reverse stitch lever shaft and the reverse stitch lever, and a lever guide that is fixed to the reverse stitch lever shaft and extends along a base end portion of the reverse stitch lever; The transmission is transmitted to a reverse stitch lever shaft via a cushion rubber member and a lever guide.

Therefore, when the reverse operation of the reverse stitch lever is performed, the rotational operation is transmitted to the reverse stitch lever shaft via the cushioning rubber member and the lever guide, and the reverse stitch lever shaft is rotated. It rotates and the feed direction of the feed dog is switched. In other words, vibration caused by the feed drive mechanism can be reliably suppressed, and the vibration suppression effect is
In order not to impair the operability of the reverse stitch lever,
This can be reliably achieved with a simple structure. Other operations are the same as those of the first aspect.

According to a third aspect of the present invention, in the second aspect of the present invention, the lever guide has a pair of regulating portions located on both sides in the rotating direction of a base end portion of the reverse stitch lever. In addition, a pair of cushion rubber members are fixed to these restricting portions. It is desirable that there is almost no gap between the reverse stitch lever and the pair of cushion rubber members. Therefore, the turning operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the buffer rubber member and the lever guide. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the lever guide is configured such that the lever guide is inserted into a through hole formed at a base end portion of the reverse stitch lever and parallel to a rotation axis direction. It has a shaft portion that is inserted in a fitting manner, and a cylindrical cushioning rubber member is externally fitted and fixed to the shaft portion. It is desirable that there is almost no gap between the inner surface of the reverse stitch lever insertion hole and the cushion rubber member.
Therefore, the turning operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the buffer rubber member and the lever guide. Other effects are the same as those of the second aspect.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example of a case where the present invention is applied to a two-needle sewing machine that can switch a work cloth between a normal feed and a reverse feed and can perform two-row sewing on the work cloth.

As shown in FIGS. 1 and 2, the sewing machine M has a sewing machine casing 1 (hereinafter referred to as a machine casing) which comprises a bed 1a, a pillar 1b, an arm 1c, and a head 1d. A main shaft 2 rotatably driven by a sewing machine motor (not shown) and a needle swing shaft 3 located below the main shaft 2 are rotatably supported inside the arm portion 1c. A needle bar base 5 is fixed to the left end of the needle swing shaft 3, and a needle bar 4 having a pair of left and right sewing needles 6 (two needles) attached to the lower end thereof is supported on the needle bar base 5 so as to be vertically movable. The needle bar 4 is reciprocated up and down in conjunction with the main shaft 2 which is rotationally driven.

A lower shaft 7 is rotatably supported on the bed 1a, and the lower shaft 7 is connected to the main shaft 2 via a timing belt 8.
The eccentric cams 22 and 30 of the feed drive mechanism 20 for driving the feed dog 9 are fixed to the lower shaft 7. A horizontal feed shaft 21 is rotatably supported at the front side of the lower shaft 7 on the bed 1a, and a swing arm 10 is fixed to the right end of the horizontal feed shaft 21 so that the bed 1a swings to a position corresponding to the eccentric cams 23 and 30. The moving arms 27 and 28 are fixed.

On the other hand, a swing arm 11 is fixed to the right end of the needle swing shaft 3, and the swing arm 11 and the swing arm 10 fixed to the horizontal feed shaft 10 are connected by a link member 12, and the horizontal feed shaft 21 is reciprocated, the swing arm 10, the link member 1
2. The swing shaft 3 is reciprocated through the swing arm 11, and the needle bar 4 is driven to swing back and forth together with the needle bar base 5.

The feed drive mechanism 20 will be described with reference to FIGS. Eccentric cam 2 fixed to lower shaft 7
A pair of left and right pieces 44 are connected via pins 24 to the distal end of the arm 23a of the cam hug 23. On the other hand, the bed 1a has a sliding groove 4 between the lower shaft 7 and the horizontal feed shaft 21.
3 is rotatably supported, and a piece 44 is engaged with a sliding groove 43a formed in the sliding groove portion 43 and guided movably.

One end of a link 26 is connected to the piece 44 via a pin 24, and the other end of the link 26 is connected to the horizontal feed shaft 2.
The swing arm 27 is fixed to the swing arm 27. A horizontal feed arm 29 extending rearward is connected to a swing arm 28 fixed to the left end of the horizontal feed shaft 21, and the feed dog 9 is fixed to the horizontal feed arm 29. That is, when the eccentric cam 22 is driven to rotate together with the lower shaft 7, the cam hug member 2
3, the horizontal feed shaft 21 is reciprocated through the pin 24, the link 44, the link 26, the swing arm 27, and the like. It is driven back and forth.

On the other hand, the fork member 31 is engaged with the eccentric cam 30 fixed to the left end portion of the lower shaft 7, and the fork member 31
Is connected to a horizontal feed arm 29. That is, the lower shaft 7
Is rotationally driven, the feed dog 9 is reciprocated back and forth as described above, and is vertically moved through the eccentric cam 30, the forked member 31, and the horizontal feed arm 29 which rotate integrally with the lower shaft 7. The reciprocating drive drives the feed dog 9 so as to draw a substantially elliptical orbit.

When the horizontal feed shaft 21 is driven back and forth,
As described above, the needle bar 4 is also driven to swing back and forth. However, the needle bar 4 and the feed dog 9 swing back and forth at the same timing. The feed dog 9 is configured so that the front and rear feed amounts are the same, and the cloth feed can be performed with the two needles 6 pierced into the work cloth.

Next, a feed adjusting mechanism 40 capable of switching the feed direction of the feed dog 9 and adjusting the feed amount of the feed dog 9 will be described.

As shown in FIG. 2, on the left side of the timing belt 8, a feed adjuster 41 is supported via a horizontal shaft 42 oriented in the left-right direction. The front portion of the feed adjuster 41 has a V-cut shape from the front side, and has a forward feed control surface 41a formed at an upper front portion thereof and a reverse feed control surface 41b formed at a lower front portion portion thereof. On the other hand, a swing arm 45 is fixed to the right end portion of the sliding groove body 43, and the swing arm 45 and the feed adjuster 41 are connected by a link 46. When the adjuster 41 is rotated, the swing arm 45 is interlocked therewith. And link 4
6. The sliding groove 43 is rotated via the feed arm 45.

Here, the sliding groove 43 is rotated together with the feed adjuster 41 to change the inclination of the sliding groove 43a of the sliding groove 43, that is, the moving direction of the piece 44 engaging with the sliding groove 43a. By doing so, the feed direction of the feed dog 9 can be switched between the forward feed direction and the reverse feed direction, and
The feed amount in the feed direction can be adjusted by the inclination of the slide groove 43a. Of course, this allows the forward and backward swing timing of the needle bar 4 to be simultaneously switched, and the swing amount to be adjusted at the same time.

As shown in FIGS. 1 and 2, a feed adjusting dial 47 is provided on the front side of the pillar 1b.
When the adjustment shaft 48 extends rearward from the gear 7 and the forward feed control surface 41 a of the feed adjuster 41 engages with the rear end of the adjustment shaft 48, the feed dog 9 can be forwarded, and the rear end of the adjustment shaft 48 is moved. When the reverse feed control surface 41b of the feed adjuster 41 is engaged with the
The feed dog 9 is ready for reverse feed.

When the adjustment dial 47 is rotated, the adjustment shaft 48 screwed to the machine frame 1a moves forward and backward, and the forward movement control surface 41a engages with the rear end of the adjustment shaft 48.
Since the rotational position of the feed adjuster 41, that is, the sliding groove body 43 changes, the reverse feed control surface 4 is attached to the rear end of the adjusting shaft 48.
Since the rotational position of the feed adjuster 41, that is, the sliding groove portion 43 when the 1b is engaged changes, the feed amount in the normal feed direction and the reverse feed direction is adjusted according to the rotation amount of the adjustment dial 47. be able to.

Now, as shown in FIGS. 2 and 4 to 8, in order to rotate the feed adjuster 41, the feed adjuster 41 includes:
A reverse stitch lever shaft 50 oriented in the left-right direction is interlocked and connected,
A connecting mechanism 60 is attached to the right end of the reverse stitch lever shaft 50.
The base end portion of the reverse feed stitch lever 55 is connected to the rear end of the reverse feed stitch lever 55, and the connection mechanism 60 is provided with a pair of buffer rubber members 71 of the reverse feed stitch lever vibration suppressing mechanism 70.

The reverse stitch lever shaft 50 is rotatably supported by the machine frame 1a. An arm member 51 is fixed to the left end of the reverse stitch lever shaft 50. The arm member 51 is connected to the feed adjuster 41 via a link 52. Have been. Further, an arm member 53 is fixed to a longitudinal center portion of the reverse stitch lever shaft 50, and an upper end portion of a tension coil spring 54 is connected to a distal end portion of the arm member 53.

The lower end of the tension coil spring 54 is connected to the machine frame 1a.
The reverse stitching lever shaft 50 is rotated and urged clockwise in the left side view by the urging force of the tension coil spring 54, and the feed adjuster 41 is moved through the arm member 51 and the link 52. In a state in which the rotation is urged counterclockwise in the left side view and the reverse stitch lever 55 is not operated, the normal feed control surface 41a of the feed adjuster 41 is engaged with the adjustment shaft 48, and the feed dog 9 is normally fed. It is possible.

The reverse stitch lever 55 is provided with a substantially horizontal operating portion 55a having a rectangular shape in plan view and provided on the front side of the pillar 1b.
And a lever portion 55b extending rearward from a right end portion of the operation portion 55a. A base end portion of the lever portion 55b is connected to a reverse stitch lever shaft 50 via a connection mechanism 60.

The connecting mechanism 60 includes a rotary connecting portion 6 for rotatably connecting the reverse stitch lever shaft 50 and the reverse stitch lever 55.
1 and a lever guide 62 fixed to the reverse stitch lever shaft 50 and extending along the base end portion of the reverse stitch lever 55. In the rotation connecting portion 61, the right end shaft portion 50 a of the reverse stitch lever shaft 50 is slidably fitted in a hole 55 c formed in a base end portion of the lever portion 55 b of the reverse stitch lever 55. Further, the base end of the lever portion 55b is sandwiched between the ring member 56 fixed to the reverse stitch lever shaft 50 and the lever guide 62, and cannot move in the axial direction (left-right direction).

The lever guide 62 includes a reverse sewing lever 55
A vertical plate portion 63 located on the right side of the base end portion of the lever portion 55b, and left and right ends extending from both upper and lower ends of the vertical plate portion 63 and located on both sides in the rotation direction of the base end portion of the lever portion 55b. It has a pair of regulating portions 64. An oval hole 63a is formed in the vertical plate portion 63 of the lever guide 62.
a, an oval shaft 50b at the right end of the reverse stitch lever shaft 50;
Are fitted, and a screw member 65 is screwed from the right end of the oval shaft portion 50b.

The reverse stitch lever vibration suppressing mechanism 70 will be described. The pair of buffer rubber members 71 are interposed between the lever portion 55b of the reverse stitch lever 55 and the pair of regulating portions 64 of the lever guide 62 with almost no gap. Each cushion rubber member 71 has a shaft portion 71a extending to the opposite side to the lever portion 55b. For example, the shaft portion 71a is pressed into a mounting hole 64a formed in the regulating portion 64 from the lever portion 55b side. , Are fixed to the regulating portion 64.

When the reverse stitch lever 55 is not operated, as described above, the forward feed control surface 41a of the feed adjuster 41 causes the adjusting shaft 48 by the urging force of the tension coil spring 54.
And the feed dog 9 can be forward-forwarded, but the operator holds the operation portion 55a by hand and the reverse stitch lever 55
Is turned downward against the urging force of the tension coil spring 54, the turning operation is transmitted to the reverse sewing lever shaft 50 via the cushioning rubber member 71 and the lever guide 62.

That is, the reverse stitch lever shaft 50 rotates integrally with the reverse stitch lever 55, and the arm member 5
The feed adjuster 41 rotates via the link 1 and the link 52, and the reverse feed control surface 41b of the feed adjuster 41 is engaged with the adjusting shaft 48, so that the feed dog 9 can be set in a state in which the feed dog 9 can be fed backward. .
While the feed drive mechanism 20 is operating, the operator operates the reverse stitch lever 5.
By holding the rotating operation of the feed gear 5, the feed dog 9 can be fed in reverse. At this time, the vibration caused by the operation of the feed drive mechanism 20 causes the feed drive mechanism 20 to move the feed adjustment mechanism 40. It is transmitted to the reverse stitch lever 55 via the reverse stitch lever shaft 50 and the like.

Conventionally, the vibration caused by the operation of the feed drive mechanism 20 is directly transmitted to the reverse stitch lever 55.
There was a problem that the operator felt the vibration received from the reverse stitch lever 50 uncomfortable. However, according to the reverse stitch lever vibration suppressing mechanism 70 of the present invention, the guide lever 6
2 is provided with a pair of cushioning rubber members 71, especially when the sewing machine M (feed drive mechanism 20) is operating at high speed.
Since the vibration transmitted to the reverse stitch lever 55 can be significantly reduced and suppressed by the cushion rubber members 71, the problem that the operator operating the reverse stitch lever 55 feels uncomfortable with the vibration transmitted to the reverse stitch lever 55 is solved. be able to.

Further, the connecting mechanism 60 has a rotating connecting portion 61 and a lever guide 62, and the turning operation of the reverse sewing lever 55 is performed via a pair of buffer rubber members 71 and the lever guide 62. , The vibration of the feed drive mechanism 20 can be reliably suppressed, and the effect of suppressing the vibration can be reliably achieved by turning the feed adjuster 41 via the reverse sewing lever shaft 50 without delay. 55 can be reliably achieved with a simple structure without impairing the operability of 55, which is advantageous in terms of manufacturing cost.

Further, the lever guide 62 has a pair of restricting portions 64 located on both sides in the rotation direction of the base end portion of the lever portion 55b of the reverse stitch lever 55. 71, the rotation operation of the reverse stitch lever 55 is performed by the cushion rubber member 71 and the lever guide 6.
2 can be reliably transmitted to the reverse stitch lever shaft 50. Also, the upper regulating portion 64 and the cushioning rubber member 7
1 can be omitted, but by providing the upper regulating portion 64 and the cushioning rubber member 71, by rotating the reverse stitch lever 55 upward, the reverse stitch lever shaft 50 is quickly and forcibly brought into the normal feed state. You can go back. That is, when the reverse stitch lever 55 is released after operating the reverse stitch lever 55 to set the reverse stitch lever shaft 50 in the reverse feed state, the reverse stitch lever shaft 5 is moved by the tension coil spring 54.
0 returns to the normal feed state, and the reverse stitch lever 55 returns to the original state via the lower regulating portion 64 and the buffer rubber member 71. However, if it is desired to return in a shorter time than the return time by the tension coil spring 54, or if for some reason the reverse stitch lever shaft 50 does not return to the normal feed state, the reverse stitch lever 55 is rotated upward. Thus, the reverse stitch lever shaft 50 can be quickly and forcibly returned to the normal feed state.

Next, another embodiment in which a part of the connecting mechanism 60 of the above embodiment and the reverse stitch lever vibration suppressing mechanism 70 are changed will be described with reference to FIGS. However,
The same components as those of the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

The connecting mechanism 60A is connected to the lever guide 62.
In the lever guide 62 having a structure in which the restricting portion 64 is omitted.
A, and a shaft member 81 extending to the left is fixedly provided on the vertical plate portion 63 of the lever guide 62A. The shaft member 81 has its small-diameter shaft portion 81a fitted and fixed in a hole 63b formed in the vertical plate portion 63 in a press-fit manner. on the other hand,
A through hole 80 is formed in the base end portion of the lever portion 55b of the reverse sewing lever 55 in a left-right direction. A shaft member 81 is loosely inserted through the through hole 80.

The buffer rubber member 82 of the reverse stitch lever vibration suppressing mechanism 70A is formed in a cylindrical shape, and the buffer rubber member 82
Is externally fitted and fixed to the shaft member 81 and is prevented from coming off by a flange portion 81b formed on the left end portion of the cushioning rubber member 82.
The buffer rubber member 82 fixed to the shaft member 81 and the insertion hole 80
When the operator holds the operating portion 55 by hand and pivots the reverse stitch lever 55 downward against the urging force of the tension coil spring 54, the pivoting operation is performed by the cushioning rubber member. It is transmitted to the reverse stitch lever shaft 50 via the lever 82 and the lever guide 62A.

As described above, according to the reverse stitch lever vibration suppressing mechanism 70A, the turning operation of the reverse stitch lever 55 can be reliably transmitted to the reverse stitch lever shaft 50 via the buffer rubber member 82 and the lever guide 62A. Other operations and effects similar to those of the above-described embodiment are exhibited.

It should be noted that the reverse stitch lever vibration suppressing mechanism and the connecting mechanism of the above-described embodiment are merely examples, and various changes may be made without departing from the spirit of the present invention.
It goes without saying that the present invention is not limited to this needle sewing machine, but can be applied to various sewing machines configured to be able to switch the feed direction of the feed dog by operating the reverse stitch lever.

[0047]

According to the first aspect of the present invention, there is provided a reverse stitch lever vibration suppressing mechanism for a sewing machine, and a reverse stitch lever shaft interlockingly connected to a feed adjuster, and a reverse stitch for rotating the feed adjuster via the reverse stitch lever shaft. A cushioning rubber member is provided in a coupling mechanism that couples the lever and the cushioning rubber member,
In particular, even when the sewing machine (feed drive mechanism) is operating at high speed, the vibration can be greatly reduced and suppressed, so that the operator operating the reverse sewing lever feels uncomfortable with the vibration transmitted to the reverse sewing lever. Can be eliminated.

Further, it is possible to transmit the rotation operation of the reverse feed stitch lever to the reverse feed stitch lever shaft via the cushioning rubber member, whereby the vibration transmitted to the reverse feed stitch lever can be reliably suppressed, and the vibration can be suppressed. The effect can be attained without impairing the operability of the reverse feed stitch lever for reliably rotating the feed adjuster via the reverse feed stitch lever shaft without operation delay.

According to the reverse stitch lever vibration suppressing mechanism of the sewing machine of the second aspect, the same effect as that of the first aspect is obtained, but the connecting mechanism is a rotary connecting portion for rotatably connecting the reverse stitch lever shaft and the reverse stitch lever. And a lever guide fixed to the reverse stitch lever shaft and extending along a base end portion of the reverse stitch lever, and configured to transmit a rotation operation of the reverse stitch lever to the reverse stitch lever shaft via the cushioning rubber member and the lever guide. Therefore, the vibration by the feed drive mechanism can be reliably suppressed, and the vibration suppressing effect can be surely achieved with a simple structure without impairing the operability of the reverse stitch lever.

According to the third aspect of the present invention, the same effect as that of the second aspect is obtained, but the lever guide is provided with a pair of levers located on both sides in the rotation direction of the base end portion of the reverse stitch lever. Since there are regulating portions and a pair of buffer rubber members are fixed to these regulating portions, the rotation operation of the reverse stitch lever can be reliably transmitted to the reverse stitch lever shaft via the cushion rubber member and the lever guide.

According to the fourth aspect of the present invention, the same effect as in the second aspect is obtained, but the lever guide is parallel to the direction of the rotation axis formed at the base end portion of the reverse stitch lever. The shaft has a cylindrical portion that is loosely inserted into the insertion hole, and a cylindrical cushioning rubber member is externally fixed to the shaft portion, so that the turning operation of the reverse stitching lever can be performed through the cushioning rubber member and the lever guide. It is possible to reliably transmit to the lever shaft.

[Brief description of the drawings]

FIG. 1 is a front view of a sewing machine according to an embodiment of the present invention.

FIG. 2 is a perspective view of the inside of the sewing machine.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a plan view of a reverse stitch lever and the like including a vibration suppression mechanism.

FIG. 5 is a left side view of a reverse stitch lever and the like including the vibration suppressing mechanism of FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 4;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a plan view of a reverse stitch lever and the like including a vibration suppression mechanism in another embodiment.

FIG. 10 is a plan view of a reverse stitch lever and the like including the vibration suppressing mechanism of FIG. 9;

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a plan view of a reverse stitch lever and a reverse stitch lever shaft according to the related art.

13 is a left side view of the reverse stitch lever and the reverse stitch lever shaft shown in FIG. 13;

[Explanation of symbols]

 M sewing machine 9 feed dog 20 feed drive mechanism 40 feed adjustment mechanism 41 feed adjuster 50 reverse stitch lever shaft 55 reverse stitch lever 60, 60A coupling mechanism 61 rotation coupling section 62, 62A lever guide 70, 70A reverse stitch lever vibration suppression mechanism 71, 82 Buffer rubber member 80 Insertion hole 81 Shaft member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazutoshi Umeda 15-1, Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Industries, Ltd. (72) Inventor Hiroyuki Suzuki 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-city Brother Industries, Ltd. F term (reference) 3B150 AA01 AA05 AA07 CE28 HA04

Claims (4)

[Claims] A feed drive mechanism for driving a feed dog;
A sewing machine comprising: a feed adjuster mechanically connected to the feed drive mechanism; and a feed adjustment mechanism capable of switching the feed direction of the feed dog by rotating the feed adjuster. A reverse stitch lever shaft linked to the
A buffer rubber that suppresses vibration transmitted from the feed drive mechanism to the feed stitch lever via the feed adjusting mechanism and the feed stitch lever shaft to a connecting mechanism that connects the feed stitch lever to rotate the feed adjuster via the feed stitch lever shaft. A reverse stitch lever vibration suppression mechanism for a sewing machine, comprising a member. 2. The connecting mechanism according to claim 1, further comprising: a rotary connecting portion rotatably connecting the reverse stitch lever shaft and the reverse stitch lever; and a lever guide fixed to the reverse stitch lever shaft and extending along a base end portion of the reverse stitch lever. 2. The reverse stitch lever vibration suppressing mechanism for a sewing machine according to claim 1, wherein a rotation operation of the reverse stitch lever is transmitted to the reverse stitch lever shaft via the buffer rubber member and the lever guide. 3. The lever guide has a pair of restricting portions located on both sides in the rotating direction of a base end portion of the reverse stitching lever, and a pair of cushioning rubber members is fixed to these restricting portions. 3. The mechanism for suppressing vibration of a reverse stitch lever of a sewing machine according to claim 2. 4. The lever guide has a shaft portion which is loosely inserted into an insertion hole formed at a base end portion of the reverse stitching lever and parallel to a rotation axis direction, and the shaft portion has a cylindrical shape. 3. The mechanism according to claim 2, wherein the cushioning rubber member is externally fitted and fixed.