JP2003135875A - Needle feeding sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needle feeding sewing machine reducing the backlash of a needle-bar oscillating stand during a low feed, and capable of supplying stable stitches without sewing errors such as skip stitches, nor causing deformation of the needle-bar oscillating stand. SOLUTION: The needle feeding sewing machine has a feed dog 23 operatively connected to a vertical feed shaft 12 and a horizontal feed shaft 17 and making four-way feeding movements; a needle feed shaft 24 causing the needle- bar oscillating stand to oscillate in cloth feed direction; and switching means 27, 28 and 28a for switching between the needle feed and the low feed by changing the connection between the needle feed shaft and the horizontal feed shaft. A first engagement member 5b is provided on the needle-bar oscillating stand 5, and a first control member 33 is provided for controlling the movement of the engagement member in the cloth feed direction when the needle feed is not working.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle feed sewing machine.

[0002]

2. Description of the Related Art As a needle feed sewing machine for feeding a cloth by shaking a needle of the sewing machine in a cloth feeding direction, for example, there is a sewing machine such as Japanese Patent No. 2682346 shown in FIG. This sewing machine has a needle feed mechanism (needle bar swing base 80, needle bar swing arm 81, needle feed shaft 2) that swings the needle bar 7 around a rotary shaft 80A.
4), a horizontal feed shaft 17 that is a drive source for needle feed, a needle bar swinging crank 82 fixed to the horizontal feed shaft 17,
A link member 83 for transmitting the swinging motion of the horizontal feed shaft 17 to the needle feed shaft 24 is provided, and the needle bar 7 swings in the cloth feed direction by driving the horizontal feed shaft 17.

In such a needle feed sewing machine, conventionally,
Means for stopping the above needle feeding movement have been developed for use as a normal sewing machine that performs lower feeding (feeding cloth only by lower feeding with a feed dog) without performing needle feeding.
For example, as shown in FIG. 15, in the above-mentioned sewing machine, slide mechanisms 84 and 85 capable of adjusting the position of the link member 83 by sliding are provided as needle feed stopping means. Each of the slide mechanisms 84 and 85 includes a guide pin 84 screwed to the needle bar swinging crank 82 and a sliding member 85 that slides on the guide pin 84 and is vertically movable. The link member 83 is rotatably attached to the sliding member 85.

When the needle is fed, a normal needle feed amount can be obtained by sliding the link member 83 to the upper position and fixing it with a screw 86. On the other hand, at the time of downward feed, as shown in FIG. 16, the link member 83 is attached to the central axis 17L of the horizontal feed shaft 17.
By sliding up and fixing with screws 86, the swinging motion of the horizontal feed shaft 17 is prevented from being transmitted to the link member 83 and the needle feed mechanisms 80, 81, and 24. As a result, the needle feed amount changes to zero.

As described above, the horizontal feed shaft 1 which is the swing drive source.
The needle feed and the lower feed are switched at the portion 7 and the movement of the needle bar rocking base 80 in the cloth feed direction F is stopped during the lower feed.

[0006]

In the above-mentioned needle feed sewing machine, since the structure for stopping the movement of the needle bar rocking base 80 at the portion of the rocking drive source, the needle feed machine from the drive source (horizontal feed shaft 17) is used. Each joint portion 87, 88, 8 up to the rod swing base 80
The play of 9 (fitting clearance) becomes the play of the needle bar rocking base 80 at the time of the lower feed, that is, the play of the needle bar 7, and there is a problem that there is a high risk of defective sewing such as skipped stitches.

In order to regulate the backlash of the needle bar rocking base 80, a method using a regulating member 90 as shown in FIG. 17 has been proposed. The regulation member 90 is provided with a U-shaped groove 90 a and is fixed to the sewing machine arm 2. Also,
On the upper portion of the needle bar rocking base 5, an engaging portion 5a protruding in the cloth feeding direction is provided. The engaging portion 5a is attached to the regulating member 90.
By fixing the restricting member 90 to the needle bar rocking base 5 with a screw while engaging with the U-shaped groove 90a, the cloth feeding direction of the needle bar rocking base 5 when the needle feed is not performed and the direction orthogonal to the cloth feeding direction. The play in the moving direction (vibration when the needle bar swings) is regulated.

However, since the regulating member 90 is fixed to the needle bar rocking base 5 with screws, the regulating member and the needle bar rocking base 5 are fixed.
Due to the existence of the clearance between them, the needle bar rocking base 5 is slightly deformed when the screw is tightened. The needle bar rocking base 5 is provided with upper and lower two bearings, and the needle bar 7 is supported by these two bearings, but these two upper and lower bearings are eccentric (deviation of the center of the upper and lower bearings). As a result, there is a problem that the needle bar 7 is twisted and the needle bar 7 may be burned.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a needle feed sewing machine capable of reducing rattling of the needle bar rocking base 5 at the time of downward feed and supplying stable stitches without stitching defects such as stitch skipping. .

Another object of the present invention is to reduce backlash of the needle bar rocking base 5 at the time of downward feeding, prevent deformation of the needle bar rocking base 5, prevent seizure of the needle bar 7, and (EN) It is possible to provide a needle feed sewing machine capable of supplying a stable seam without a sewing defect such as a jump.

[0011]

In order to achieve the above object, according to the present invention, an upper shaft rotatably supported in a sewing machine arm and a cloth feed direction around a spindle parallel to the upper shaft. A needle bar rocking base that is swingably supported on the needle bar, a needle bar that is vertically movable on the needle bar rocking base, and moves up and down in conjunction with the upper shaft, and is rotatable in the sewing machine bed. A supported vertical feed shaft, a horizontal feed shaft rotatably supported in the sewing machine bed, a transmission member for transmitting the movement of the upper shaft to the vertical feed shaft and the horizontal feed shaft, and a horizontal feed shaft for the vertical feed shaft. By changing the connection state between the feed dog that is interlocked with the feed shaft and performs four feed motions, the needle feed shaft that swings the needle bar swing base in the cloth feed direction, and the needle feed shaft and the horizontal feed shaft, In a needle feed sewing machine having a switching means for switching needle feed and lower feed, And the engaging member, when the needle feed inoperative, needle feed sewing machine, characterized in that a first regulating member for regulating the movement in the cloth feeding direction of the engaging member.

A second engaging member provided on the needle bar rocking base along the cloth feeding direction, and a second restricting member for restricting movement of the second engaging member in a direction orthogonal to the cloth feeding direction. , Are preferably provided.

Further, it is preferable that the second restricting member is fixed to the machine frame, and the base end side of the first restricting member is attached to the second restricting member.

More preferably, the second restricting member is capable of holding the first restricting member in an acting position and an inoperative position for engaging the first engaging member.

Further, according to the present invention, an upper shaft rotatably supported in the sewing machine arm and a needle bar swinging member supported swingably in a cloth feeding direction around a support shaft parallel to the upper shaft. A moving table, a needle bar that is vertically movable on the needle bar swing table and moves up and down in conjunction with the upper shaft, a vertical feed shaft rotatably supported in the sewing machine bed, and a sewing machine bed. And a horizontal feed shaft rotatably supported by the vertical feed shaft, a transmission member for transmitting the motion of the upper shaft to the vertical feed shaft and the horizontal feed shaft, and four feed motions linked to the vertical feed shaft and the horizontal feed shaft. The feed dog, the needle feed shaft for swinging the needle bar swing base in the cloth feed direction, and the needle feed shaft by changing the connection state of the needle feed shaft and the horizontal feed shaft,
In a needle feed sewing machine provided with a switching means for switching the lower feed, a roller guide fixed to one end of the spindle and supported together with the needle bar swing base so as to be swingable in the cloth feed direction,
An elongated hole formed along the vertical direction of the roller guide,
A needle feed sewing machine is provided, which is provided with a positioning shaft which is loosely fitted in the elongated hole when the needle feed is inactive and regulates the movement of the roller guide in the cloth feed direction.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a needle feed sewing machine according to the present invention will be described below. First, the overall configuration of the needle feed sewing machine according to the present embodiment will be described with reference to FIGS. The sewing machine includes an upper shaft 1 rotatably supported in a sewing machine arm 2, a balance mechanism 3 provided at a left end portion of the upper shaft 1, and a needle bar up / down mechanism 4. “Left” and “right” are the directions as seen from the operator side. A swing shaft (support shaft) 60 parallel to the upper shaft 1 is rotatably supported by a bearing 61 fixed to the frame in the jaw 2a of the sewing machine arm 2. A needle bar rocking base 5 is fixed to one end of the rocking shaft, and a roller guide 6 is fixed to the other end. The roller guide 6 has a guide groove 6a.

A needle bar 7 is supported on the needle bar swing base 5 so as to be vertically movable, and the roller guide base 6 has a shaft center of the needle bar 7 and a guide groove portion 6a.
They are assembled so that their centers match. The needle bar up-and-down mechanism 4 is a crank mechanism like the conventional sewing machine, and the upper end of the needle bar rod 8 is rotatably supported. The lower end of the needle bar rod 8 is connected to the needle bar holder 9, and when the needle bar rod 8 rotates, the needle bar 7 moves up and down.

An upper sprocket 10 is fixed to the right end of the upper shaft 1. The vertical feed shaft 1 is installed in the sewing machine bed 11.
2 is rotatably supported, and a lower sprocket 13 is fixed to the right end of the vertical feed shaft 12. The upper shaft 1 is rotated by a motor (not shown), and the upper and lower sprockets 10, 1
The rotation of the upper shaft 1 is transmitted to the upper and lower feed shafts 12 via the timing belt 19 that is stretched between the three.

A horizontal eccentric cam 14 is fixed to the vertical feed shaft 12, and one end of a horizontal rod 15 is loosely fitted and supported on the horizontal eccentric cam 14. The other end of the horizontal rod 15 is connected to a horizontal feed amount adjusting mechanism 16 similar to a conventional sewing machine.

A horizontal feed shaft 17 is rotatably supported on the operator side of the sewing machine bed portion 11. The horizontal feed shaft 1
One end of a horizontal feed arm 18 is fixed to the horizontal feed arm 1
The other end of 8 is connected to the horizontal feed amount adjusting mechanism 16.

The vertical feed shaft 12 to which the rotation of the upper shaft 1 is transmitted
Is transmitted to the horizontal feed arm 18 as a swinging motion via the horizontal feed amount adjusting mechanism 16, and the horizontal feed shaft 17 performs the swinging motion. Therefore, the swinging motion of the horizontal feed shaft 17 is synchronized with the rotation of the upper shaft 1. Upper and lower sprockets 10,1
3 and the timing belt 19 constitute a transmission member for transmitting the movement of the upper shaft 1 to the vertical feed shaft 12 and the horizontal feed shaft 17.

The transmission member is not limited to the belt, and a link may be used to move the upper shaft 1 in the vertical feed shaft 12 and the horizontal feed shaft 1.
7 may be transmitted. In the case of the present embodiment, the vertical feed shaft 12 directly driven by the timing belt 19 makes full rotation, and the horizontal feed shaft 17 makes a swinging motion. 12 and the horizontal feed shaft 17, the vertical feed shaft 12 and the horizontal feed shaft 1
All of 7 perform a swinging motion. Also, two links that swing together with the upper shaft are used.
Movement of the upper shaft 1 by the second link to the vertical feed shaft 12
The movements may be individually transmitted to the horizontal feed shaft 17.

A feed dog vertical movement mechanism 20 is connected to the left end of the vertical feed shaft 12, and a feed base arm 21 is fixed to the left end of the horizontal feed shaft 17. A feed dog 23 is fixed to the feed table 22, one end of which is freely fitted and supported by the feed dog vertical movement mechanism 20 and the other end of which is vertically supported by the feed dog arm 21. Movement and horizontal feed axis 1
A known four-feed motion is generated by the combination of the swinging motions of 7 to perform cloth feeding.

A needle feed shaft 24 is rotatably supported by the sewing machine arm portion 2. A first needle feed shaft arm 25 is attached to the left end of the needle feed shaft 24 by a screw 25a and a second needle feed is attached to the right end. The shaft arms 26 are fixed by screws 26a.

A needle feed arm 27 is fixed to the right end of the horizontal feed shaft 17, and the rod feed screw 2 is attached to the needle feed arm 27.
One end of the needle feed rod 28 is loosely fitted and supported via 8a,
The other end of the needle feed rod 28 is loosely fitted and supported by the second needle feed shaft arm 26.

When the horizontal feed shaft 17 swings in synchronization with the rotation of the upper shaft 1, the swinging motion of the horizontal feed shaft 17 causes the needle feed arm 2 to move.
7 is transmitted to the needle feed shaft 24 via the needle feed rod 28 and the second needle feed shaft arm 26. The needle feed arm 27 and the needle feed rod 28 constitute the switching means of the present invention.

The first needle feed shaft arm 25 and the guide base 6 are connected by a connecting link 29, and the swinging motion of the needle feed shaft 24 rolls through the first needle feed shaft arm 25 and the connecting link 29. By being transmitted to the guide base 6, the roller guide base 6 swings together with the swing shaft 60. Therefore, the needle bar rocking base 5 fixed to the rocking shaft
Also swings in the cloth feed direction F around the swing shaft 60.

A square piece 30 is loosely fitted to the right end of the needle bar holder 9, and a side surface of the square piece 30 engages with a guide groove portion 6a of the roller guide base 6 to rattle the needle bar 7 in the rotational direction. Are regulated.

As described above, when the upper shaft 1 rotates, the needle bar swing base 5 swings in the cloth feed direction (F direction) in synchronization with the vertical movement of the needle bar 7 and the movement of the feed dog 23. It is designed to do. Next, the first and second engaging members and the first and second regulating members of the present embodiment will be described based on FIGS.

An engaging portion (second engaging member) 5a projecting in the cloth feeding direction is provided on the upper portion of the needle bar rocking base 5, and this engaging portion 5a is fixed to the sewing machine arm portion 2. 2 Play in a direction orthogonal to the cloth feed direction of the needle bar rocking base 5 by engaging with the U-shaped groove 31a of the regulating member 31 (N direction blur when the needle bar rocks)
Are regulated. A holding portion (first engaging member) 5b that is concentric with the needle bar 7 and protrudes in the vertical movement direction of the needle bar 7 is formed on the upper portion of the needle bar swing base 5. The groove portion (U-shaped groove 31a) of the second regulating member has a predetermined length and is formed along the vertical direction. Therefore, even when the needle bar rocking base 5 rocks during needle feeding, the second restricting member only prevents rattling of the needle bar rocking base engaging portion 5a in a direction orthogonal to the needle feeding. The needle bar rocking table can perform a predetermined needle feeding motion.

The U-shaped portion 33a is formed and the first regulating member 33 has one end (base end side) of which is screwed into the second regulating member 3.
It is attached to 1. As shown in FIG. 7 (A), the first restricting member 33 has a U-shaped portion 33 a with a needle bar swinging base 5.
7 is fixed to the second restricting member 31 in a state of being engaged with the holding portion 5b, or the engagement between the U-shaped portion 33a and the holding portion 5b is released as shown in FIG. 7B. In this state, it is fixed to the second regulating member 31. In this way, the second regulating member 31
Can be held at a position (acting position) where the first restricting member 33 engages with the holding portion 5b of the needle bar rocking base 5 and a position (non-acting position) where the engagement is released.

As shown in FIG. 8, the sewing machine bed 11 is provided with a rod holding member 32. The rod holding member 32 is formed with a female screw 32a that can be screwed into the rod step screw 28a.

An operation for switching from needle feed to downward feed in the needle feed sewing machine of the embodiment having the above configuration will be described.

First, the screw 25a is loosened to release the fixation of the first needle feed shaft arm 25 and the needle feed shaft 24, or the screw 26a is loosened to fix the second needle feed shaft arm 26 and the needle feed shaft 24. To cancel.

Next, as shown in FIG. 8 (B), the rod step screw 28a is removed to release the connection between the needle feed arm 27 and the needle feed rod 28, and the needle feed rod 28 is moved as shown in FIG. 8 (C). Then, it is fixed to the cylindrical rod holding member 32 by the rod step screw 28a. As a result, even if the horizontal feed shaft 17 swings due to the rotation of the upper shaft 1, the swing is not transmitted to the needle feed shaft 24.

Thereafter, the needle (not shown) attached to the lower end of the needle bar 7 and the needle hole of the needle plate for lower feed provided on the upper surface of the sewing machine bed 11 are aligned with each other to make the first needle feed shaft arm. 25 or the second needle feed shaft arm 26 is fixed to the needle feed shaft 24, the lower sprocket 13 and the vertical feed shaft 12 are released from the fixed state, and the vertical movement of the needle bar 7 and the timing of the feed dog 23 at the time of the lower feed. And the lower sprocket 13 is fixed to the vertical feed shaft 12 again. This completes the switching.

In the present embodiment, there are joints A, B, C, D as shown in FIG. 2, and in the case of the conventional example, all the rattling of such joints is of the needle bar rocking base 5. There is play, and the needle bar 7 will play during downward feed (when needle feed does not work). However, in the present embodiment, the backlash in the direction N orthogonal to the cloth feed direction of the needle bar swing base 5 during the downward feed (when the needle feed is inactive) is caused by the needle bar swing base 5.
7A and the U-shaped groove 31a of the second restriction member 31 are engaged with each other, and the rattling of the needle bar swing base 5 in the cloth feed direction F is as shown in FIG. 7A. It is regulated by engaging the U-shaped portion 33a of the first regulating member 33 with the holding portion 5b of the needle bar rocking base 5 and fixing the first regulating member 33 to the second regulating member 31.

When the needle is fed, the U-shaped portion 33a is avoided upward at a position where the holding portion 5b and the U-shaped portion 33a are not engaged, as shown in FIG. 7B. State, first
The regulation member 33 is fixed to the second regulation member 31.

As described above, according to the present embodiment, the backlash of the needle bar rocking base 5, particularly the backlash in the cloth feed direction F is reduced at the time of the lower feed, and stable stitches are supplied without stitching defects such as stitch skipping. can do.

Further, at the time of switching the lower feed, the first regulating member 33
Is engaged with the needle bar rocking base 5, and the regulating member is not fixed to the needle bar rocking base 5 with screws as in the conventional example shown in FIG. Therefore, since the needle bar swinging base 5 is not deformed, it is possible to provide a highly reliable sewing machine in which the needle bar is not seized.

Although the needle feed sewing machine according to the present invention has been described above based on the embodiment shown in the drawings, the present invention is not limited to this embodiment and can be variously modified. For example, as shown in FIG. 9, an elongated hole 6b may be formed in the roller guide 6 and the positioning shaft 34 may be installed in the sewing machine arm 2 at a position facing the elongated hole 6b. Roller guide 6
By loosely fitting the positioning shaft 34 in the long hole 6b of
Rolling of the roller guide 6 is restricted. With this configuration, the blurring of the roller guide base 6 at the time of the lower feed is reduced, and accordingly, the rattling of the needle bar swing base 5 and the needle bar 7 in the rotation direction around the swing shaft 60 is reduced, so that stitches such as stitch skipping are sewn It is possible to supply stable seams without defects.

Although the rod holding member 32 has a cylindrical shape as shown in FIG. 10, a female thread portion 132a screwed to the rod step screw 28a is formed on the rod holding member 132 made of sheet metal as shown in FIG. 10A. The rod holding member 132 may be formed and fixed to the sewing machine bed 11. Alternatively, FIG.
As shown in (B), a female screw portion 232a to be screwed with the rod step screw 28a may be directly formed on the frame boss 232.

To switch to the lower feed, as shown in FIG. 11, a sheet metal 62 provided with an elongated hole 62a and a screw hole 62b to be screwed with the rod step screw 28a is fixed to the sewing machine frame, and the rod 62 is connected to the rod. 28 may be fixed and the position of the metal plate 62 may be adjusted to adjust the needle drop.

The first regulating member 33 is the second regulating member 3
Instead of fixing it to the sewing machine arm 1, it may be directly fixed to the sewing machine arm section 2.

Furthermore, the cylindrical holding portion 5 of the needle bar rocking base 5
An example in which b is concentric with the needle bar 7 is shown in FIGS. 12 (A) and 12 (B).
As shown in (C), the holding portions 5c, 5 which are not concentric with the needle bar 7
It may be d or 5e. Further, as shown in FIG. 12 (B), a rectangular holding portion 5d may be used.

Further, an example in which the U-shaped portion 33a is provided on the thick block material as the first regulating member 33 is shown in FIG.
As shown in FIGS. 3 (A) to 3 (D), the sheet metal regulating member 13
3,233,333,433 can be used. Further, as shown in FIG. 7A, the regulating member 133 having the round hole 133a is provided, or as shown in FIG.
You may use the regulation member which provided.

Furthermore, an example has been shown in which the needle feed arm 27 and the needle feed rod 28 constitute the switching means for switching the needle feed and the lower feed by changing the connection state of the needle feed shaft and the horizontal feed shaft. The present invention is also applicable to a needle feed sewing machine using a switching means as shown in FIGS.

[0048]

According to the needle feed sewing machine of the first aspect, the first engaging member provided on the needle bar swinging base and the needle feed sewing machine in the cloth feeding direction when the needle feed does not work. Since the first restricting member for restricting the movement is provided, the backlash of the needle bar rocking base at the time of the lower feed is reduced, and the needle bar rocking base is not deformed. It has become possible to supply stable seams.

According to the needle feed sewing machine of the second aspect,
A second engaging member provided on the needle bar rocking base along the cloth feeding direction and a second restricting member for restricting movement of the second engaging member in a direction orthogonal to the cloth feeding direction are provided. Therefore, it is possible to further reduce the rattling of the needle bar swing base during the downward feed, and it is possible to supply a stable seam without a sewing defect such as a stitch skip.

According to the needle feed sewing machine of the third aspect,
The second restricting member is fixed to the machine frame and
Since the base end side of the restricting member is attached to the second restricting member, the first and second restricting members are compactly combined, and the effect of space saving is obtained.

According to the needle feed sewing machine of claim 5,
A roller guide fixed to one end of the support shaft and supported together with the needle bar rocker so as to be swingable in the cloth feed direction; and an elongated hole formed along the vertical direction of the roller guide. A positioning shaft is provided which loosely fits into the elongated hole when the needle feed does not work and regulates the movement of the roller guide in the cloth feed direction.

Therefore, the backlash of the needle bar rocking base at the time of the lower feed can be reduced, the needle bar rocking base can be prevented from being deformed, and a stable seam can be supplied without a sewing defect such as a stitch skip. Became.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a needle feed sewing machine according to the present invention.

FIG. 2 is a perspective view of a main part of this embodiment.

FIG. 3 is a perspective view of a main part of this embodiment.

FIG. 4 is a perspective view of a main part of this embodiment.

5A and 5B are main parts of a needle bar rocking base and a second regulation member of the present embodiment, FIG. 5A is a perspective view, and FIG.

FIG. 6 is an exploded perspective view showing a needle bar swinging base and first and second regulating members of the present embodiment.

FIG. 7 is a perspective view showing the needle bar swing base and the first and second regulating members of the present embodiment, and FIG. 7A shows a state in which the movement of the needle bar swing base is regulated by the regulating member (B). ) Indicates a state in which the regulation of the movement of the needle bar swing base by the regulation member is released.

FIG. 8 is a perspective view of a switching means of the present embodiment,
(A) shows a state where the needle feed rod and the horizontal feed shaft are connected, (B) shows a state where the connection is released, and (C) shows a state where the needle feed rod is further fixed to the rod holding member.

9A and 9B show a roller guide and a positioning shaft of another embodiment, FIG. 9A is an exploded perspective view, and FIG. 9B is a sectional view.

FIG. 10 is a perspective view of a rod holding member of another embodiment, (A) shows a sheet metal rod holding member, and (B) shows a rod holding member fixed to a bed boss.

FIG. 11 is a perspective view showing a switching means of another embodiment.

FIG. 12 is a perspective view of a holding member of another embodiment,
(A) shows a holding part which is not concentric with the needle bar (B) shows a rectangular holding part.

FIG. 13 is a perspective view showing a first restricting member of another embodiment, each of which is formed of a sheet metal member, and further, (A) has a round hole that engages with the first engaging portion, and (B). Is an example having an elongated hole that engages with the first engaging portion, and (C) and (D) are examples having U-shaped portions that engage with the first engaging portion, respectively.
(D) is an example in which the mounting portion to the second restricting member is rotatable.

FIG. 14 is a perspective view of a conventional needle feed sewing machine.

FIG. 15 is a switching mechanism for needle feed and lower feed of a needle feed sewing machine according to a conventional example, showing a state of needle feed.

16 shows the switching mechanism of FIG. 15 at the time of downward feeding.

17A and 17B show a regulation member and a needle bar swinging base of a needle feed sewing machine according to a conventional example, FIG. 17A is an exploded perspective view, and FIG.

[Explanation of symbols]

1 Upper axis 2 sewing machine arm 5 needle bar rocker 5a Second engaging member 5b, 5c, 5d, 5e First engaging member 6 roller guide 6b slot 7 needle bar 10, 13, 19 Transmission member 12 Vertical feed axis 17 Horizontal feed axis 23 Feed dog 24 needle feed shaft 27, 28, 28a switching means 31 Second regulating member 33 First regulating member 34 Positioning axis 60 spindles

Claims (4)

[Claims] 1. An upper shaft rotatably supported in a sewing machine arm, a needle bar swinging base swingably supported in a cloth feed direction around a spindle parallel to the upper shaft, and the needle. A needle bar that is vertically movably supported on a bar oscillating platform and vertically moves in conjunction with the upper shaft, a vertical feed shaft rotatably supported in the sewing machine bed, and rotatably supported in the sewing machine bed. A horizontal feed shaft, a transmission member that transmits the movement of the upper shaft to the vertical feed shaft and the horizontal feed shaft, a feed dog that makes four-feed movement by being linked to the vertical feed shaft and the horizontal feed shaft, and the needle In a needle feed sewing machine provided with a needle feed shaft for swinging the rod swing base in the cloth feed direction, and a switching means for switching the needle feed and the lower feed by changing the connection state of the needle feed shaft and the horizontal feed shaft, A first engaging member provided on the needle bar rocking base, and cloth feeding of the engaging member when the needle feeding does not work. A needle feed sewing machine comprising a first restricting member for restricting movement in a direction. 2. The needle feed sewing machine according to claim 1, wherein a second engaging member provided on the needle bar rocking base along a cloth feeding direction is orthogonal to the cloth feeding direction of the second engaging member. A needle feed sewing machine, comprising: a second regulating member that regulates movement in a direction. 3. The needle feed sewing machine according to claim 2, wherein the second restricting member is fixed to a machine frame, and
A needle feed sewing machine characterized in that the base end side of the regulating member is attached to the second regulating member. 4. An upper shaft rotatably supported in a sewing machine arm, a needle bar swinging base swingably supported in a cloth feed direction around a support shaft parallel to the upper shaft, and the needle. A needle bar that is vertically movably supported on a bar oscillating platform and vertically moves in conjunction with the upper shaft, a vertical feed shaft rotatably supported in the sewing machine bed, and rotatably supported in the sewing machine bed. A horizontal feed shaft, a transmission member that transmits the movement of the upper shaft to the vertical feed shaft and the horizontal feed shaft, a feed dog that makes four-feed movement by being linked to the vertical feed shaft and the horizontal feed shaft, and the needle In a needle feed sewing machine provided with a needle feed shaft for swinging the rod swing base in the cloth feed direction, and a switching means for switching the needle feed and the lower feed by changing the connection state of the needle feed shaft and the horizontal feed shaft, It is fixed to one end of the support shaft and supported swingably in the cloth feed direction together with the needle bar swing base. Roller guide table, an elongated hole formed along the vertical direction of the roller guide table, and when needle feed does not work, the roller guide table is loosely fitted to move the roller guide table in the cloth feed direction. A needle feed sewing machine having a positioning shaft for regulating.