JPS6096296A - Automatic sewing machine having sewing head part with rotary housing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention comprises a construction head and a feed device that produces a two-dimensional relative movement between the workpiece to be constructed and the construction head, A rotating housing is supported in the rotating housing, and a side bar for holding the needle is supported within the rotating housing so as to be movable up and down by a crank transmission driven by a main drive shaft of the component head, and a needle feeding movement device is provided. , the rotary housing is swingable about a side axis by a rotary housing transmission, and an inner hook support housing an inner hook driven by the main drive shaft is connected to the rotary housing transmission. The present invention relates to an automatic sewing machine which can be driven to swing by the same rotational angle as the rotary housing by means of a transmission device for the inner hook support.

Prior art Such an automatic sewing machine, known from German Patent Application No. 1 158 800, is characterized in that (3) the rotary housing attached to the arm of the component head and the hook support accommodating the hook rotate at the same time; Only the corners can be driven.

The rotary housing and the hook support are driven via an actuating motor which is controlled by a probe element which is guided along a curve that corresponds to the desired seam course. The actuating motor acts via a toothed gear on the rotary housing, from where transmission takes place via a shaft with a bevel gear to the hook support, which in turn is driven via a toothed gear. It is driven by The drive of the needle bar crank transmission is carried out by a double bevel gear which is supported concentrically with respect to the axis of the needle, which is driven on the one hand by the main drive shaft via a bevel gear transmission; On the other hand, a crank transmission for the needle bar is driven via a bevel gear transmission supported on the rotary housing. This configuration is very sluggish and is not particularly suitable for high speed automatic sewing machines.

OBJECTS OF THE INVENTION Accordingly, the problem on which the present invention is based is (4) to simplify and structurally drive the needle bar crank transmission supported by the rotating housing from the main drive shaft supported by the component head; The first thing to do is to configure an automatic sewing machine for the insertion mentioned above so that it can be carried out without loss.

Means for Achieving the Object In order to solve this problem, according to the invention, a double toothed belt wheel is rotatably supported concentrically with respect to the axis of the needle, and on one of the toothed belt portions, A toothed belt driven by the main drive shaft is routed through a toothed belt wheel, and a needle bar crank transmission is driven through another toothed belt wheel on the other toothed belt wheel. Another toothed belt is running around.

Effects of the invention Two toothed belt transmissions which are connected only via a double toothed belt drive are structurally simple and can be driven without loss. (5) This double-toothed belt drive is particularly simple and space-saving, since the double-toothed belt drive is supported freely rotatably and axially immovably on an axle, that is, a hollow shaft. and is supported. Another toothed belt wheel is connected to the shaft driving the crank transmission of the needle bar via a bevel gear transmission supported in the rotating housing, and from the toothed belt transmission to the crank transmission. It becomes extremely easy to transmit torque to the

BRIEF DESCRIPTION OF THE DRAWINGS Further advantages and features of the invention emerge from the following description of an exemplary embodiment with the aid of the appended claims and the drawings.

The automatic sewing machine shown in the drawing has a pedestal 1 on which a feed device 2 for a work piece 3 and a cut piece 4 to be sewn thereon and a component head 5 are provided.

In principle, the feed device 2 has a linkage 6 consisting of a four-bar linkage, which is connected in a transmission manner to a control disk 7 . This control disk 7 is mounted on an output shaft 8 of a transmission 9 which is mounted on a frame l. Transmission @9
(6) The rotational drive of the control disk 7 is effected from the drive motor 10 of the component head 5, which is also provided on the pedestal 1. A drive motor 10 drives an intermediate transmission 12 via a transmission belt 11 . From this intermediate transmission 12 another transmission belt 1
3, the main drive shaft 15 of the component head 5, which has a handle wheel 14 on the outside, is driven. A transmission connection between the intermediate transmission bag M12 and the transmission device 9 is established via the third transmission belt 16.

The link mechanism 6 has a fixed rotation center formed by a shaft 17 fixed to the pedestal 1. On this axis 17, a control disk 7 is arranged, oriented approximately at right angles to the main direction of the component head 5.
A connecting rod 18 located higher up is swingably supported.

This connecting rod 18 has a guide roller 19 which fits into a groove-like control curve 20 on the upper side of the control disk 7.

A further connecting rod 21 is supported on the shaft 17 below by the control disc 7 and is approximately perpendicular to the upper connecting rod 18 and thus approximately parallel to the main direction of the component head 5. It extends to This connecting rod 21 also has an upwardly projecting guide roller 22, which is connected to the control disk 7.
It fits into the groove-like control curve 23 formed on the lower surface of.

The control curves 20, 23 each extend as closed curves over the entire circumference of the control disk 7 and are naturally non-circular.

At the end of the ten-piece connecting rod 18 on the side opposite to the shaft 17 there is an intermediate lever 25 arranged parallel to the lower connecting rod 21.
is pivoted by a pin joint 24 and likewise extends above the control disc 7. At the free ends of the lower connecting rod 21 and the intermediate lever 25 that are remote from the shaft 17 and the pin joint 24, an output connecting rod 28 is pivotally connected by means of a pin joint 26,27 and extends parallel to the upper connecting rod 18. ing.

This output connecting rod 28 extends below the control disk 7. 4
The linkage 6 defined by the three pivot points 17, 24, 26, 27 is a substantially right-angled, substantially equilateral parallelogram linkage, as can be seen from FIG. A work piece holder 29 is connected to the output connecting rod 28 and accommodates the work piece 3 and the cut piece 4 (8). As mentioned above, this automatic sewing machine is commercially available and is known in principle from German Patent No. 3,000,831, which corresponds to US Pat. No. 4,347,797.

The component head 5 has a generally vertically extending upright post 30 from which extends horizontally a housing-like lower base plate 32 as well as an upper arm 31.

A rotary housing 33 is provided on the lower surface of the free end of the arm 31 so as to be swingable about an axis 34 . This axis line 3
A needle 35 and a needle bar 36 for holding the needle 35 are also provided on the needle 4. The rotary housing 33 is aligned with the axis 34 by the screw 37.
It is attached to an end flange 38 of a hollow shaft 39 coaxially supported within the arm 31 . In particular, on the hollow shaft 39, which is supported in the arm 31 by means of a bearing 40, a toothed belt pulley 41 is mounted by means of a sliding key 42 so as to prevent relative rotation. This toothed belt 41 is transmission-coupled via a toothed belt 43 to another toothed belt 44 , the latter toothed belt 44 bearing in a bearing 45 in the upright column 30 .
, 46, and is coupled to a shaft 47 supported by 9) so as to prevent relative rotation. In the lower region of this shaft 47, a gear wheel 48 is connected to this shaft 47 in such a manner that it does not rotate relative to the gear wheel 48;
are interlocking. The sector gear 49 is formed into a square lever 50 which is connected to the upright post 30 and the base plate 32.
It is supported around the pivot shaft 51 in the transition area between the two and exits from the housing opening 52 . This rectangular lever 50 is swingably connected to a control lever 54 by a coupling lever 53, and the control lever 54 is supported around a fixed swing shaft 55 on the frame l.

A guide roller 56 that projects upwardly is supported by the control lever 54 and fits into a closed control curve 57 formed on the underside of the control disk 7. Via such a rotary housing transmission fIi 58, the rotary housing 33 is driven to drive the workpiece holder 29 and, as will be explained further below, the needle 35 is driven to move tangentially to the seam course. be done.

Another toothed belt pulley 59 is coupled to the lower end of the shaft 47 so as not to rotate with respect to the phase (lO), and is transmission coupled to a toothed belt pulley 61 by a toothed belt 60, the latter belt pulley 61 being connected to the base plate 32. It is mounted on a hollow shaft 62, which is supported concentrically with respect to the axis 34 within, so as not to rotate relative to it. An inner pot support 63 is attached to one end of the hollow shaft 62. This forms a transmission device 64 for the inner hook support, by means of which the inner hook support 63 is connected to the rotary housing 3.
It is made to swing by the same angle as 3.

The main drive shaft 15 supported by a bearing 65 in the upright column 30 connects the bearing 67 of the upright column 30 via a bevel gear transmission M66.
．． A vertical distribution shaft 69 supported by 68 is driven, at the upper end of which a toothed belt pulley 70 is mounted for relative rotation. The toothed belt wheel 70 connects the hollow shaft 39 coaxially to the axis 34 via the toothed belt 71
A double toothed belt pulley 72 supported by a bearing 73 on top
is driven. In this case, the toothed belt 71 is routed around the upper toothed belt wheel portion 74.

A toothed belt (11) 76 leads from the lower toothed belt part 75 to a toothed belt wheel 77, through which the needle bar 36 is driven via a shaft 78 on which the belt wheel 77 is attached. This shaft 78, which is supported in the rotary housing 33 by bearings 79,80, drives, via a bevel gear transmission 81, a shaft 84, which is supported horizontally in bearings 82, 83 of the rotary housing 33. This shaft 84 has a crank 85 at its end adjacent to the needle bar 36, and a balance transmission 87 and the needle bar 36 are driven via a crank pin 86 of this crank.

The needle bar 36 is supported by an upper support 88 and a lower support 89 of the needle bar swinging piece 90 so as to be movable in the axial direction. A drive pin 91 is attached to the needle bar 36 between the supports 88 and 89, and a crank lever 92 rotatably provided on the pin 91 is coupled to the crank pin 86 of the crank 85 so as not to rotate relative to it. Therefore, the needle bar 36 is driven up and down by the shaft 84.

A swing piece transmission device 93 is provided at the end of the shaft 84 that is far from the needle bar 36, and has an eccentric ring 94 mounted on the shaft 84 so as not to rotate relative to the phase (12). An eccentric 94 is articulated via a drawbar 95 to a crank 96, and a shaft 97, on which the crank 96 is mounted for relative rotation, is supported in the rotating housing 33 below and parallel to the shaft 84. has been done. This axis 9
Since the needle bar swing piece 90 is attached to the needle bar 7 so as not to rotate relative to each other, the needle bar swing piece 9
0 makes an oscillating movement and performs what is called needle feeding.

The rotary housing 33 has removable lids 98.9 on the side of the oscillating piece transmission 93 and on the side with the needle bar 36, respectively.
I have 9.

A toothed belt pulley 100 is attached to the lower end of the distribution shaft 69 so as not to rotate relative to each other, and this belt pulley +00 drives a toothed belt pulley +02 via a toothed belt +01, which is supported within the hollow shaft 62. The inner hook shaft +03 is attached to this belt pulley 102 so as not to rotate relative to it. An umbrella (13) supported within the inner hook support 63 by this inner hook shaft +03, a gear transmission 104 and a toothed belt transmission 105
The inner hook is similarly supported within the inner hook support 63 and has a horizontal rotation axis! 06 is driven. This transmission for the inner pot is designated as a whole with the reference numeral 107, and is likewise designated by the distribution shaft 69.
The transmission for the needle bar, the needle bar rocker, and the thread take-up, which are guided via the toothed belt 71, are collectively designated by the reference numeral +08. The needle thread 109 threaded through the needle 35 is pulled out from a thread feeder +10 in the form of a spool held by a hollow shaft 39 and supplied to a thread take-up gear 87. This transmission device 87 has a balance 111 configured as a double arm.

This balance 111 has a hole 112 in its upper end that emerges from the rotary housing 33. The lower end 116 of the balance I11 is rotatably supported on the crank pin 86. Balance I
11 is further pivotally connected to one end of a connecting rod 115 at an intermediate rotation center (not shown), and the other end of this connecting rod 115 is swingably supported on a pin +14 fixedly provided within the rotating housing 33. There is. The upper thread 109 is attached to the rotating housing 3
3 and through an opening (14) in its wall (FIG. 3) it reaches the thread tightening device +13, from where it is guided through the hole 112 of the thread take-up I11 to the needle 35.

The opening curve 20° 23 on the control disc 7 of the working feed device 2 is
Cut piece 4, which is a pocket, is connected to processed piece 3 by seam 114.
It is configured to be sewn on. During the introduction or removal of the workpiece 3 together with the cut pieces 4, the needle 35 is at an intermediate point 118 with respect to the workpiece holder 29. This intermediate point 118 is
This is obtained by moving the work piece 3 and the cut piece 4 from the end point 119 of the seam 117 to the intermediate point +18 without stitching after the seam 117 is completed. The work piece holder 29 moves this section together with the work piece 3 and the cut piece 4 to an end point 119.
During the passage from to the intermediate point 118, the rotary housing 33 and the bobbin case support 63 are rotated back to the neutral phase position shown in FIG. As in conventional sewing machines with a needle feed drive, the feed movement takes place in a plane extending at right angles to the plane of the drawing.

Due to the action of the oscillating piece transmission device 93, the oscillating movement of the needle bar oscillating piece 90 is superimposed on the vertical movement of the needle 35.
Draw an elliptical orbit with a closed tip, which is not shown in the drawing,
In other words, the needle 35 performs the needle feeding movement already described. At the top or bottom dead center of this elliptical trajectory, the needle 35 assumes a generally vertical position coinciding with the axis 34 of the rotating housing 33. The large angular deviation of the needle 35 from this direction of the axis 34 is approximately 10 degrees. Further, the feed device 2 is connected to the work piece holder 2.
9 is continuously moved, the relative movement of the workpiece 3 with the cut piece 4 and the needle 35 is carried out in accordance with the course of the seam 117. Transmission gear for rotating housing with control curve 57 @5
8, at the respective seam point 120, a needle feed movement is carried out tangentially +21 to the seam 117, as shown in FIG. The inner hook support transmission 64 makes it possible to ensure that the inner hook 106 assumes its correct position. Therefore, while the seam is being formed from the seam start point 122 to the seam end point 9, only a minimum movement force is generated on the work piece 3 and the cutting piece 4.

During the rotational movement of the rotating housing 33, the balance 111 is also rotated. Since the yarn feeding takes place through the hollow shaft 39 and the yarn feeding device 110 is rotated together with the hollow shaft 39, the yarn feeding also remains unchanged.

From Figures 1 and 2, the seams shown in Figure 7! 2
0, it can be seen how the rotary housing 33 is swung by an angle α in order to obtain a tangential direction 121 relative to the neutral position.

[Brief explanation of drawings]

Fig. 1 is a plan view of an automatic sewing machine that sews pocket cut pieces onto a workpiece, Fig. 2 is a front view of the automatic sewing machine as seen in the direction of arrow TI in Fig. 1, and Fig. 3 shows the rotating housing in the neutral position. The configuration head of the automatic sewing machine when it is oscillated is
FIG. 4 is an enlarged vertical cross-sectional view passing through the center of the rotary housing; FIG. 5 is a front view of the rotary housing viewed in the direction of arrow ■ in FIG. 4; FIG. 6 is a rear view of the rotary housing as seen in the direction of arrow Vl in FIG. 4 (17), and FIG. 7 is a plan view of the workpiece to which the pocket has been sewn. 2... Feeding device, 3... Work piece, 5... Component head, 15... Main drive shaft, 33... Rotating housing, 3
4... Needle axis line, 35... Needle, 36... Needle bar, 5
8... Transmission device for rotating housing, 63... Inner hook support, 64... Transmission device for inner hook support, 70.77.
...Toothed belt wheel, 71.76...Toothed belt,
72...Double toothed belt wheel, 74.75...Toothed belt wheel portion, 85...Crank, 106...Inner hook (18)

Claims (1)

[Scope of Claims] 1. A sewing machine comprising a sewing head and a feeding device that generates two-dimensional relative movement between the work piece to be sewn and the sewing head, and a rotary housing is supported by the sewing head. A needle bar holding needles is supported within the rotating housing so as to be movable up and down by a crank transmission driven by a main drive shaft of the sewing head, and a needle feeding movement device is provided, and the rotating housing is rotated. For an inner hook support in which the inner hook support, which accommodates an inner hook that can be oscillated around the axis of the needle by a housing transmission device and is driven by a main drive shaft, is connected to a rotating housing transmission device. In a transmission device that can be oscillated by the same rotational angle as the rotary housing, the double toothed belt wheel (7) is concentric with the needle axis (34).
2) is rotatably supported (1), and one toothed belt wheel portion (74)
A toothed belt (71) driven by the main drive shaft (15) via a toothed belt wheel (70) is wound around the main drive shaft (15).
Another toothed belt (76) that drives a crank transmission for the needle bar (36) is routed around the other toothed belt wheel portion (75) via another toothed belt wheel (77). An automatic sewing machine that is characterized by: 2. The rotating housing (33) rotates the sewing head (5) by means of a shaft (39) provided concentrically with respect to the axis (34) of the needle.
) is supported by the arm (31) of the double shaft toothed belt wheel (7
2) is supported on the shaft (39) in a freely rotatable and axially immovable manner. 3 Another toothed belt wheel (77) is connected to the rotating housing (
33) Bevel gear transmission fi! (81)
2. The automatic sewing machine according to claim 1, wherein the sewing machine is connected to a shaft (84) for driving a crank transmission of the needle bar (36) through the needle bar (36).