JPH07148366A - Machine head for multi-head sewing machine - Google Patents

Abstract

PURPOSE:To reduce a gap between machine heads by making small the machine head breadth of a multi-head sewing machine. CONSTITUTION:The thickness of a drive cam 35 fitted to a machine head body 30 via a bearing 33 is made somewhat smaller than the thickness of the bearing 33, and the cam 35 is kept in such state as housed within the bearing 33, thereby Making the breadth of a machine head 5 itself small without any transverse projection of the drive cam 35. According to this construction, a gap between a plurality of adjacent machine heads 5 can be set to be extremely small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine head for a multi-head sewing machine mainly for business, which is used when sewing a futon or the like.

[0002]

2. Description of the Related Art As a multi-head sewing machine, a plurality of sewing heads and a sewing machine base are arranged side by side on a movable frame that moves in the horizontal direction, and the movable frames are moved vertically and horizontally while operating the sewing needles provided in each sewing machine head. There is a structure in which a futon material filled with batting (or simultaneously with filling batting) is sewn by sliding. The sewing machine head has a drive cam, which is a plate cam that rotates integrally with a horizontally extending cam shaft, mounted on a sewing machine head through a bearing, and the drive shaft such as a motor rotates the cam shaft to drive the drive cam. In general, the eccentric movement causes the needle bar connected to the drive cam via the crank to move up and down to operate the sewing needle at the tip of the needle bar up and down.

[0003]

In the case of such a multi-head type sewing machine, the narrower the space between the sewing needles, that is, the space between the sewing machine heads, the more suitable it is to cope with various changes in stitches and subdivision of stitches. Is. However, the spacing tends to be restricted by the width of the sewing machine head itself,
Particularly in the case of the above configuration, the drive cam mounted on the sewing machine head projects laterally to increase the width of the entire sewing machine head.

The present invention has been made in view of the above circumstances, and provides a sewing machine head for a multi-head sewing machine, which is capable of reducing the width of the sewing machine head of the multi-head sewing machine and narrowing the space between the sewing machine heads. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is a plate cam type drive cam rotatably mounted on a sewing machine head main body through a bearing, and this drive. A cam shaft, which is connected to the center of rotation of the cam and is rotated by the drive body, is connected to the eccentric part of the drive cam via a crank, and moves vertically in the longitudinal direction of the drive cam, which extends substantially vertically as the drive cam rotates. In a sewing machine head of a multi-head sewing machine having a needle bar to which a sewing needle is attached at its tip, the thickness of the drive cam is set to be equal to or less than that of the bearing, and the sewing machine is built in the bearing and mounted. .

[0006]

According to the present invention, the drive cam of the sewing machine head is
The thickness is set slightly smaller than the thickness of the bearing and is installed in the sewing machine head in the state of being housed in this bearing, so compared to the conventional configuration in which the drive cam laterally protrudes, the sewing machine head The width of itself is significantly reduced. Therefore, it is possible to set the interval between the plurality of adjacent sewing machine heads to be extremely small.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall outline of a futon manufacturing apparatus including a multi-head sewing machine 1 to which the present invention is applied. This apparatus includes batting supply mechanism 80 to batting 81, and dough feeding mechanism 82 to upper cloth 83. And the lower cloth 84 are supplied to the multi-head sewing machine 1, and the batting 81 is sewn with the multi-head sewing machine 1 in a state of being sandwiched between the upper cloth 83 and the lower cloth 84. It is configured to be sent to a cutting machine (not shown) via the device. The arrow (a) indicates the transfer direction of the batting 81, the upper cloth 83, and the lower cloth 84, and the description in the front-rear direction in the following description is based on this transfer direction. In some cases, back stitching opposite to the (a) direction may be performed in order to change the stitches.

In the multi-head sewing machine 1 according to the present invention, as shown in FIGS. 2 to 4, a fixed frame 3 and a movable frame 4 are arranged in front and back on a base 2, and these frame 3,
A plurality of sewing machine heads 5 and a plurality of sewing machine bases 6 are set in a pair in each set 4.

A base frame 8 is installed on the base 2 so as to be movable left and right along a pair of front and rear rails 7 extending left and right. The fixed frame 3 is fixed to the front end of the base frame 8. This fixed frame 3
On the rear side, a slide table 10 is installed so as to be movable back and forth along a pair of left and right rails 9 extending in the front and rear direction. On the slide table 10, a slide table 10 is moved left and right along a pair of front and rear rails 11 extending left and right. Movable table 12 possible
Is installed. Therefore, on the base 2, both the fixed frame 3 and the movable frame 4 move left and right as the base frame 8 moves left and right, and the movable frame 4 becomes independent by the forward and backward movement of the slide table 10 or the left and right movement of itself. It is possible to move back and forth and left and right. The motor 13 is used to move the base frame 8 from side to side
Further, the screw feed mechanism 14 moves the slide table 10 back and forth. Also, slide table 1
The horizontal movement of 0 is performed by a drive mechanism (not shown).

The fixed frame 3 and the movable frame 4 are
A plurality of the sewing machine heads 5 are provided on the upper beam 21 with the same configuration including the left and right columns 20 and the upper and lower beams 21 and 22.
Corresponding to this, the sewing machine bases 6 are set on the lower beams 22, respectively.

As shown in FIGS. 5 (a) and 5 (b), the sewing machine head 5 vertically moves a vertically extending needle bar 31 attached to the sewing machine head body 30 and is attached to the lower end of the needle bar 31. The sewing needle 32 is moved up and down,
The sewing machine head body 30 is fixed to the upper beam 21. The sewing machine head body 30 is made of a substantially rectangular parallelepiped plate material that is long in the vertical direction, and a bearing 33 is provided at its upper end portion so that its axial direction matches the plate thickness direction of the sewing machine head body 30.
And it is attached via a ring 34. A plate cam type drive cam 35 is fixed to an inner race (not shown) of the bearing 33. The thickness of the drive cam 35 is set to be slightly smaller than the thickness of the bearing 33, and the drive cam 35 is built in and mounted in the bearing 33. That is, the drive cam 35 is mounted in the sewing machine head main body 30 via the bearing 33 while being housed in the bearing 33.

The drive cam 35 has a cam shaft 3 from one side.
6 is fixed coaxially. The cam shaft 36 is provided with a timing belt 7 (described later) wound around a pulley 37.
It is designed to rotate with the action of 2. A crankshaft 40 that constitutes a crank 39 is attached to an eccentric portion on the other surface of the drive cam 35. The crank 39 has a crankshaft 40 whose one end is pin-connected to the drive cam 35.
And a crank rod 41 which is eccentrically attached to one end of the crank shaft 40 and is pin-connected, and the needle bar 31 is pin-connected to the other end of the crank shaft 40. The needle bar 31 is supported so as to be vertically movable along a guide 42 provided on the sewing machine head body 30 in a state where the axial direction is along the vertical direction, and when the drive cam 35 rotates as the cam shaft 36 rotates, By the action of the drive cam 35 and the crank 39, the needle bar 31 moves up and down with a predetermined stroke. At the tip of the needle bar 31, a sewing needle 32
Is detachably attached. A balance (not shown), through which the upper thread is passed, is integrally fixed to the upper end of the crank rod 41. The other end of this balance is pin-connected to the sewing machine head body 30.

A collar 45 fixed to the pulley 37 with a bolt 44 is eccentrically attached to the cam shaft 36 on the sewing machine head body 30 side of the pulley 37 on the cam shaft 36. A pressing cam 47 is rotatably mounted on the outer circumference of the bearing via a bearing 46. The pressing cam 47 has an operating portion 48 at the lower end, and a pressing rod 50 is connected to the operating portion 48 via a connecting rod 49. The presser bar 50 is supported so as to be vertically movable along a guide 51 provided on the sewing machine head body 30 in a state where the axial direction is along the vertical direction, and the collar 45 rotates as the cam shaft 36 rotates. As the presser cam 47 moves up and down, the presser bar 50 moves up and down with a predetermined stroke. A presser foot 53 is attached to the tip of the presser bar 50 via a bracket 52. The presser foot 53 is arranged in a bowl shape suitable for sewing a futon so that the sewing needle 32 can pass through a needle insertion hole 54 formed in the bottom.

The above is the construction of the sewing machine head 5, and the sewing machine head body 30 with the upper beam 21 and the cam shaft 36 parallel to each other.
Is fixed to the upper beam 21 at a constant interval,
A plurality of sewing heads 5 are set on each upper beam 21 of the fixed frame 3 and the movable frame 4.

Next, the sewing machine base 6 will be described with reference to FIGS. 4 to 7. The sewing machine base 6 includes a base plate 60 on the lower beam 22 of the fixed frame 3 and the movable frame 4.
And a support plate 61 attached via
The needle plate base 62 fixed to the upper end of the
And a needle plate 63 fixed on the upper part.

The support plate 61 includes a short plate portion 61a and a long plate portion 61.
b has an L-shaped cross section, and the short plate portion 61a is aligned in one direction of the lower beam 22 and the short plate portion 61a is pin-coupled to the base plate 60, and the support plate 61 is rotatable about the vertical direction. Has become. A rotary shaft 65 is rotatably mounted on a long plate portion 61b of the support plate 61 via a bearing 64. The rotary shaft 65 has a bottomed cylindrical case case (outer frame) 66.
Are mounted coaxially. The opening 66a of the hook case 66 is opened horizontally, and from the opening 66a,
A bobbin 67 having a bobbin thread wound therein is inserted into and taken out of the comb case 66.

A pulley 68 is fixed to the end of the cam shaft 65 on the side opposite to the side where the cam case 66 is mounted. That is, the support plate 6 is formed by the hook case 66 and the pulley 68.
It is in a state of sandwiching the short plate portion 61a of No. 1 and the rotary shaft 6
5 is set so that the axial direction is parallel to the lower beam 22. In this way, a plurality of hook cases 66 are set on the lower beam 22 at regular intervals.

As described above, the plurality of hull cases 66 rotate together with the support plate 61, but these hull cases 66 have one of the openings 66a on either side (in this case, the fixed frame 3).
Side is aligned toward the left, and the movable frame 4 side is aligned toward the right). In this state, the support plate 61 is integrally connected by a link rod 69 extending parallel to the lower beam 22, and the link rod 69 is arranged in the longitudinal direction. By pushing and pulling, all the hook cases 66 arranged on the lower beam 22 are rotated together with the support plate 61. In this case, as shown in FIG. 7, the fixed frame 3
The opening 66a of the side casing case 66 is about 4 diagonally to the front left.
The opening 66a of the comb case 66 on the movable frame 4 side is set to 5 degrees, and the opening 66a is set to rotate obliquely to the rearward and obliquely about 45 degrees. In this way, the link rod 69 for rotating the hook case 66 may be driven manually or may be driven by a driving device such as a cylinder. The rotation axis of the support plate 61 is the needle bar 31 of the sewing machine head 5.
It is set coaxially with.

A sewing machine head drive shaft 70 and a sewing machine base drive shaft 71 are arranged on the upper beam 21 and the lower beam 22 of the fixed frame 3 and the movable frame 4 so as to be close to and parallel to them, respectively. The pulley 37 fixed to the cam shaft 36 of the drive cam 35 and the sewing machine head drive shaft 70, and the cam shaft 65 and the sewing machine drive shaft 71 of the hook case 66 forming the sewing machine base 6, respectively. 72 and 73 are individually connected. Sewing machine drive shaft 70
The sewing machine base drive shaft 71 is connected by a timing belt 74 wound around one end thereof, and the sewing machine head drive shaft 71 is rotated by a (driving body) 75 by a drive motor. When the drive motor 75 operates, the rotation of the sewing machine drive shaft 70 is transmitted to the individual cam shafts 36, and the needle bar 31 and the presser foot 53 of the sewing machine head 5 move up and down. The rotation is transmitted to the base drive shaft 71, the rotary shaft 65 rotates, and the rotary case 66 rotates. These operations, that is, the operations of the sewing machine head 5 and the sewing machine head 6 are set to be performed synchronously so that sewing can be performed.

The above is the configuration of the multi-head sewing machine 1 of the present embodiment. Next, the operation of the multi-head sewing machine 1 and the effects based thereon will be described.

The batting supply mechanism 80 to the batting 81, and the cloth feeding mechanism 82 to the upper cloth 83 and the lower cloth 84, the sewing machine head 5 and the sewing machine base 6 of the multi-head sewing machine 1 shown in FIG. The sewing machine head 5 and the sewing machine base 6 are operated while being supplied between the upper and lower cloths 83 and 84 to sew the batting 81 between the upper cloth 83 and the lower cloth 84. At the time of sewing, the movable frame 4 of the multi-head sewing machine 1 is moved back and forth and left and right to adjust the positional relationship between the movable frame 4 and the fixed frame 3 as appropriate to form a desired stitch. When the sewing is completed, the material is fed to the cutting machine (not shown) through the material feeding mechanism 85 to obtain the futon.

According to the multi-head sewing machine 1 of this embodiment, the drive cam 35 that constitutes the sewing machine head 5 is set so that its thickness is slightly smaller than the thickness of the bearing 33.
Since it is mounted on the sewing machine head 5 while being housed in the bearing 33, the width of the sewing machine head 5 itself is significantly reduced as compared with the conventional configuration in which the drive cam projects laterally. . For this reason, it is possible to set the interval between the plurality of sewing machine heads 5 adjacent to each other provided side by side on the upper beam 21 to be extremely small, and it is possible to effectively cope with various changes in stitches and subdivision of stitches. .

Further, by narrowing the space between the sewing machine heads 5 as described above, the space between the sewing machine base 6 and the sewing machine base 6 paired with each other is necessarily narrowed accordingly. Therefore, the problem is that the opening 66a is formed in the adjacent direction.
The bobbin 67 is put in and taken out of the hook case 66 which faces. That is, there is a concern that the adjacent case cases 66 may interfere with the bobbin 67 due to the narrow distance between the case cases 66, making it impossible to take the bobbin 67 in and out. However, in the case of this embodiment, the case 66
Is rotated diagonally with the support plate 61, and the opening 66a
However, in the case of the fixed frame 3 side, the movable frame 4 in front of
In the case of the side, the bobbin 67 can be put in and taken out from the hook case 66 because it faces the vacant space behind. That is, even if the distance between the sewing machine heads 5 is narrowed, there is no problem in setting the distance between the sewing machine bases 6 accordingly. In addition, as described above, the basic operation is sewing with the opening 66a of the hook case 66 facing horizontally, but it is also possible to perform the sewing while the hook case 66 is obliquely arranged.

[0024]

As described above, according to the sewing machine head of the multi-head sewing machine of the present invention, a plate cam type drive cam rotatably mounted on the sewing machine head body through a bearing, and a drive cam of this drive cam. A cam shaft that is connected to the center of rotation and is rotated by a driving body, is connected to an eccentric portion of the driving cam through a crank, and moves up and down in its lengthwise direction that extends substantially vertically as the driving cam rotates, In a sewing machine head of a multi-head sewing machine having a needle bar to which a sewing needle is attached at its tip, a drive cam is installed by being installed in the bearing with its thickness set to a bearing or less. However, the width of the sewing machine head itself is significantly smaller than that of the conventional structure in which the drive cam protrudes laterally, and the spacing between adjacent sewing machine heads is narrowed. Since it becomes possible to set narrow, an effect such very effectively cope when performing subdivision of a variety of changes and seam stitch.

[Brief description of drawings]

FIG. 1 is a schematic side view of a futon manufacturing apparatus including a multi-head sewing machine according to an embodiment of the present invention.

FIG. 2 is a side view of the multi-head sewing machine according to the embodiment.

FIG. 3 is another side view of the same.

FIG. 4 is a view taken along the line AA of FIG.

5A is a front view of the sewing machine head, and FIG. 5B is a side view thereof.

FIG. 6 is a front view of the sewing machine base.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

 1 Multi-head type sewing machine 5 Sewing machine head 30 Sewing machine head body 31 Needle bar 32 Sewing needle 33 Bearing 35 Drive cam 36 Cam shaft 39 Crank 75 Drive motor (drive body)

Claims (1)

[Claims] 1. A plate cam type drive cam that is rotatably mounted on a sewing machine head through a bearing, a cam shaft that is connected to the center of rotation of the drive cam and that is rotated by a drive body, and a bias of the drive cam. A sewing machine head of a multi-head sewing machine that is connected to a core portion via a crank, and vertically moves in a length direction of the drive cam that extends substantially vertically with the rotation of a drive cam, and has a needle bar to which a sewing needle is attached at its tip. 2. The sewing machine head of a multi-head sewing machine according to claim 1, wherein the drive cam has a thickness less than or equal to the bearing and is installed in the bearing.