JPS59194786A - Cloth presser of automatic sewing machine - 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]

The present invention relates to a presser foot device for an automatic sewing machine, and more particularly to a presser foot device for an automatic sewing machine that includes an eccentricity adjustment mechanism that allows the eccentricity of an eccentric cam connected to a main shaft to be arbitrarily adjusted from zero to a predetermined amount. be. Based on the sewing information stored in a memory element such as FROM, the work to be sewn is moved and driven in an arbitrary direction while being held between cloth holding plates,
2. Description of the Related Art Automatic sewing machines that perform automatic sewing are well known and are widely used as industrial sewing machines as well as household sewing machines. In such automatic sewing machines, in order to perform smooth cloth feeding, it is necessary to press the cloth lightly to the extent that it does not interfere with cloth feeding (normally, the height of the presser foot is set and automatic sewing is performed). In other words, when the object to be sewn is simply a so-called plain stitch such as overlapping several layers, the height of the presser foot is set correspondingly and the sewing work is performed.However, in the case of a plain stitch, the above It would have been better to simply set the height of the presser foot in advance according to the thickness of the material to be sewn, as in
For a workpiece that has flat stitches and step stitches in one sewing pattern, if the height of the presser foot is set for plain stitching, the presser foot may be Sewing becomes impossible when the presser foot hits the step sewing part, and on the other hand, if the height of the presser foot is set for the step stitching, there is a disadvantage that the presser foot does not have an appropriate presser action during plain stitching. Therefore, in order to sew a workpiece that has a grazing stitch and a step stitch in one sewing pattern, a predetermined amount (for example, 2
Homo-5) Automatic sewing machines having a presser foot device configured to allow vertical movement of the presser foot have come into widespread use. However, in the automatic sewing machine including the above-mentioned improved presser foot device, it is not possible to obtain a case where the vertical movement of the presser foot is zero. Inappropriate gaps in the fabric cause the fabric to flutter, resulting in skipped stitches and poor thread tightening, making it impossible to perform smooth and proper automatic sewing.Therefore, improvements have been desired. The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to make it possible to arbitrarily adjust the link fulcrum position of the link mechanism that transmits the rotational movement of the eccentric cam to the presser foot vertical movement mechanism from zero to a predetermined amount. An object of the present invention is to provide an improved presser foot device for an automatic sewing machine that allows the height of the presser foot to be adjusted arbitrarily. In order to achieve the above object, the present invention includes an eccentric cam connected to a main shaft, and a presser foot vertical movement mechanism that moves the presser foot up and down in synchronization with the main shaft via a link mechanism in accordance with the rotation of the eccentric cam. The presser foot device for an automatic sewing machine is characterized in that it includes a link circumferential adjustment mechanism that allows the link fulcrum position of the link mechanism to be arbitrarily adjusted from zero to a predetermined amount. Preferred embodiments of the present invention will be described below based on the drawings. 1 and 2.3 are schematic explanatory diagrams of an automatic sewing machine including an eccentricity adjustment mechanism according to the present invention. In the figures, a main shaft 12 is provided in a sewing machine arm 10, and the main shaft 12 is driven by a drive device (not shown). Rotate to perform sewing drive. That is, in synchronization with the rotation of the main shaft L2, the needle 20 fixed to the needle bar 18 moves up and down via a known needle bar mechanism, and an eccentric cam 14 is connected to the main shaft 12, and the link adjustment described later is performed. Automatic sewing is performed by moving the presser foot 24 up and down via the mechanism 16 and the presser foot vertical movement mechanism 22. A cloth presser bar 26 is provided in parallel with the needle bar 18, and a cloth presser foot 24 is fixed to the lower end of the cloth presser rod 26 with a screw 28. It extends along the rod 18. A presser bar holder 30 is fixed to the fabric presser bar 26 with a screw 40, and a presser bar holder 30 is provided between the presser bar holder 30 and an adjustment screw 34 screwed onto the sewing machine arm 10, and a presser bar holder 30 is provided along the circumference of the fabric presser bar 26. 32 is inserted, and the presser spring 32 presses the cloth presser rod 26 downward. Set the presser foot 2
The position of the presser foot 6 is adjusted by the adjustment screw. The presser bar holder 30 has a protruding shaft 36 and a protruding piece 38,
The protruding shaft 36 engages with a bell crank 58, which will be described later, and forms part of a presser foot vertical movement mechanism. Further, an upper thread guide 42 is fixed to the presser bar holder 30 with a screw 44. As is clear from Fig. 3, on the side of the sewing machine arm IO,
A mounting plate 46 is screwed onto the plate 4 by screws 48.
A &'id circumferential screw 50 is screwed into a screw hole provided in the protruding piece 6. The upper end of the spring guide rod 52 is brought into contact with the adjustment screw 50 from below.
The lower end of the L-shaped metal fitting 54 is in contact with an L-shaped metal fitting 54, and one end of this L-shaped metal fitting 54 is screwed onto a bell crank 58 at the rotation fulcrum position of the U-shaped bell graph 4580 by a stepped screw 56. The stepped portion of the screw 56 allows the bell crank 58
is rotatably supported by the L-shaped fitting 54. That is, the bell crank 58 uses the stepped screw 56 as a fulcrum, as will be described later, and rotates in response to the position of the link fulcrum of the link adjustment mechanism 16.
0 is pivotally attached to the protruding shaft 36 of the presser bar holder 30, and a stepped shaft 62 is screwed onto the protruding end of the protruding shaft 36, so that the stepped shaft 64 of the stepped shaft 62 allows the bell crank 58 to
The extended end portion 60 and the bell crank 58 are connected, and the stepped screw 5
The rotational movement of the bell crank 580 with 6 as the fulcrum is converted into the vertical movement of the presser foot 26. The spring guide section 52
A pressing spring 66 is inserted into the
The position of the bell crank 58 is adjusted by pressing and urging the bell crank 58 through the lever 54 and adjusting the adjusting screw 5o by screwing the adjusting screw 5o. b1] A roller 68 is pivotally supported on the side opposite to the stepped portion 64 of the stepped foot 62, and the roller 68 is inserted into the long groove 200 of a bell crank guide 72 screwed onto the sewing machine arm 1o with a screw 70. The vertical movement of the extended end portion 6o on the bell crank 580 side is auxiliary guided. The upper end of the bell crank 58 is threadedly connected to an arm 76 by a stepped screw 74, and the arm 76 is connected to a swing arm 80 provided at one end of a swing shaft 78 by a stepped screw 84. connected. Furthermore, the said rocking 11qh 7s
A rocking arm 82 is provided at the other end. The presser foot vertical movement mechanism is configured as described above, and the main shaft! In synchronization with the rotation of 2, the presser foot is driven up and down via a link adjustment mechanism described below. According to the present invention, the vertical movement of the presser foot height can be arbitrarily adjusted via the link adjustment mechanism described below. A characteristic feature of the present invention is that the link mechanism that transmits the eccentric rotational movement of the eccentric cam +4 to the presser foot vertical movement Wj 22 is configured such that the link fulcrum position can be arbitrarily adjusted by a predetermined amount from zero. As is clear from FIG. 2, the link adjuster #il; 16 is the groove link 8.
6 and Link@88. The swinging arm 82 is connected to one end of a link arm 88 by a stepped screw 9o, and the other end of the link arm 88 has a square piece portion 9 made of an arcuate rectangular parallelepiped integrally formed with the stepped screw 92.
4 are fixedly connected by a washer 96 and a locking nut 98. The square piece portion 94 is slidably engaged with the arcuate long groove +00 formed in the groove link 86. A link fulcrum is formed at the engagement portion between the link arm 88 having the square piece portion 94 and the arc-shaped long groove 100, and when this link fulcrum is adjusted, an arbitrary swinging momentum of the groove link 86, which will be described later, is It will be transmitted to the arm 88. As can be seen in FIG. 4, the groove link 86 is rotatably supported on the sewing machine arm 10 by a washer lO4 and a locking nut l0IC at its stepped portion +02, and the side extending end of the groove link 86 ! 08 is connected to one end of the rod 112 by a stepped screw 110, and as a result is connected to the main shaft 12 (the groove link 86 performs a rocking motion in response to the eccentric rotation of the eccentric cam 14. 114 is fixedly connected to the main shaft 12, and its eccentric shaft portion +16 rotatably engages with the rod 112 to swing the rod 112. By adjusting the number 1'20 indicating the vertical feed speed provided on the outside of the arcuate long groove, a corresponding oscillating movement can be obtained, resulting in the desired vertical movement of the presser foot. In other words, as shown in FIG.

If the alignment mark 118 is set to [0], the swinging motion shown in FIG. 6 will be obtained, and if the alignment mark 118 is set to the designated number [5], the swinging motion shown in FIG. 7 will be performed. Further, on the sewing machine base of the automatic sewing machine in the practical row, an upper fabric holding plate 122 and a lower fabric holding plate 124 are slidably supported. Automatic sewing is performed by holding an object and moving it arbitrarily in two axes. Furthermore, a hook 126 is provided directly below the needle 20 and is rotatably driven by the main shaft 12 using a known mechanism.As shown in FIG. The upper cloth holding plate 1 is driven by
22 and the lower fabric holding plate 124, sewing is performed. The embodiment of the misfire 81i has the above configuration, and its operation will be explained below. First, in the case of a workpiece having a sewing pattern with only dry stitching, see Fig. 5, 8i-! As shown in Figure 6, the link arm 8
Set the alignment mark of 8 + 18 to the instruction number 12 of the groove link 86
0 of

If it is set to [0], the stepped screw 92 will be removed.
Matches the axis of 02-J-ru. As a result of 7, due to the eccentric rotation of the eccentric cam 14, the Crad 11
2, the groove link 86 itself performs a swinging motion using the point indicated by the instruction number (0) as a pivot point, but no swinging motion is transmitted to the link arm 88, and the upper part of the presser foot 24 "F"
motion becomes zero. Next, in the case of a sewn product that has flat stitching and step stitching in one sewing pattern, the feed amount described above

By loosening the locking nut 98 from the [0] position and aligning the alignment mark +18 on the link arm 88 with an arbitrary designated number indication 120 corresponding to the level difference in the workpiece, the presser foot can be moved up and down to a predetermined position corresponding to that number. Momentum will be obtained. For example, when the alignment mark 118 is aligned with [5] of the instruction number 120, the groove link 86 will move to the stepped portion +
As a result of being connected to the link arm 88 at the farthest position from 02, the swinging motion of the groove link 86 is transmitted to the swinging arm 82 via the link arm 88 at a maximum of t. This will result in upward movement. When the sewing machine is operated in this state, the swinging motion of the groove link 86 is transmitted to the swinging shaft 78 via the link arm 88 and the swinging arm 82, and this momentum is further transmitted to the belt via the swinging arm 80 and the arm 76. The vibration is transmitted to the crank 58, and a rocking motion is performed using the step screw 56 as a fulcrum. This bell crank 580 side extended end 60 is inserted into the protruding shaft 36 of the presser bar holder 30, and the front control presser bar holder 30 is guided by the rollers 68 of the stepped shaft 62 in the long groove 200 of the bell crank guide 72. As a result, the presser bar holder 30 also moves up and down at the same time, and the presser bar 26 and the presser foot 24 follow this and move up and down. The presser spring 66 presses the spring guide rod 52 downward at the time, and since the L carved metal fitting 54 and the bell crank 58 are fixed by the stepped screw 56, the adjustment action of the adjusting screw 50 causes the bell crank 58 to be pressed downward. The location will be determined. The timing of the presser foot 24 relative to the vertical movement of the needle 20 is determined by the mounting phase of the eccentric cam 14 with respect to the main shaft 12. As explained above, according to the present invention, in a sewing pattern that is a simple plain stitch or has a stepped portion and a plain stitch, it is a simple task to match the alignment mark +18 of the link arm 88 to the desired indicated number of the groove link 86. By being able to adjust the upper F motion of the presser foot, it is possible to handle the above sewing applications with a single automatic sewing machine, without having to use different automatic sewing machines with the relevant function each time depending on the workpiece with a different sewing pattern. It has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a preferred embodiment of an automatic sewing machine according to the present invention, FIG. 2 is an exploded view of the main part of FIG. 1, and FIG.
The figure is an explanatory diagram showing the presser foot vertical movement mechanism of the automatic sewing machine according to the present invention, FIG. 4 is a schematic plan view of the link adjustment mechanism according to the present invention, and FIG. 5 is a schematic explanatory diagram of the link adjustment mechanism according to the present invention. , FIG. 6.7 is a diagram of the swing state of the load link in the link adjustment mechanism according to the present invention. In each figure, the same members are designated by the same symbols iiL, to is the sewing machine arm, 12 is the main shaft, 14 is the eccentric cam, 16 is the link adjustment mechanism, 22 is the presser foot vertical movement TFI paulownia, 24 is the iF presser,
86 is a groove link, 88 is a link arm, and 100 is an arcuate long groove. Agent Patent attorney Masuo Oiwa (and 2 others) Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 2 Procedural amendment (voluntary) 1. Indication of case Patent application No. 1982-070259 2. Invention Name of automatic sewing machine presser foot device 3, relationship with the case of the person making the amendment Patent applicant address 2-2 Marunouchi, Chiyoda-ku, Tokyo Part 4, 2nd generation Tamaki Address: Marunouchi Nee LlN, Chiyo [1] Ward, Tokyo
No. 42 No. 3:), column for detailed description of the invention in the specification subject to amendment, and drawings.

Claims (1)

[Claims] (1) A presser foot device for an automatic sewing machine that includes an eccentric cam connected to the main shaft, and a presser foot vertical movement mechanism that moves the presser foot up and down in synchronization with the main shaft via a link mechanism according to the rotation of the eccentric cam. A presser foot device for an automatic sewing machine, characterized in that it includes a link adjustment mechanism that allows the link fulcrum position of the link mechanism to be adjusted arbitrarily from zero to a predetermined amount. (21) In the device according to claim (1), the link adjustment mechanism includes a groove link that is rotatably supported on a sewing machine arm, swings by an eccentric cam, and has an arcuate long groove; 1. A cloth presser for an automatic sewing machine, comprising a link arm that engages with the arcuate long groove at an arbitrary position, and the retaining portion forms a link fulcrum.