JPH0367716B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a presser foot device for a sewing machine that moves a suture needle both vertically and simultaneously in the sewing direction, and is particularly suitable for three-dimensional sewing of suits, etc. The present invention relates to a presser foot device suitable for.

[Prior Art] Currently, three-dimensional sewing is used to sew the body fabric and sleeves of a suit, and a movable sewing machine that moves three-dimensionally using a robot arm or the like is used for this three-dimensional sewing. Generally, this type of sewing machine moves at a constant speed relative to the fabric, so it is equipped with a so-called needle feed mechanism that feeds the suture needle that has passed through the fabric in the same direction as the sewing direction, that is, the sewing direction. In addition, since the sewing machine itself moves against a fixed cloth, it is not possible to press the cloth with a strong pressing force with the presser foot like in a normal lockstitch sewing machine, so as shown in Fig. 5, The presser member 1 is
It is held close to the upper surface of the cloth 2.

[Problems to be Solved by the Invention] As described above, in the movable sewing machine, by providing the needle feeding mechanism and preventing the cloth presser member 1 from coming into contact with the upper surface of the cloth 2, the displacement of the cloth position due to movement of the sewing machine can be prevented. Although it is now possible to prevent
For the purpose of suppressing flapping of the cloth 2, the cloth presser member 1 cannot be separated too far from the upper surface of the cloth 2, and is kept at a constant height close enough to avoid contact with the cloth surface. For this reason, for example, if the cloth 2 to be sewn has a split part 2a as shown in FIG. There was an inconvenience in that one piece of 2a was turned over and overlapped with the other piece, and was sewn in that state.

In particular, when sewing the body fabric of a suit to the sleeves using three-dimensional sewing, both pieces of the split part formed at the shoulder of the body fabric rise significantly from the top of the fabric due to the curve of the shoulder. This makes it even more likely that it will get caught in the presser member.

This invention was made by focusing on the above-mentioned problem, and when sewing a cloth in which a split part is formed,
To provide a presser foot device for a sewing machine, which prevents a presser member from getting caught in a split part and provides good sewing quality at any location.

[Means for Solving the Problems] The present invention includes a needle feeding mechanism that moves a needle bar holding a suture needle in the vertical direction and along the sewing direction, and a presser foot at the lower end, and a needle bar that moves the needle bar holding the suture needle in the sewing direction from the presser foot forward in the sewing direction. A presser foot member having an extending inclined portion moves in the vertical direction and along the sewing direction in synchronization with the needle bar, and a lower end portion of the presser foot member moves forward in the sewing direction with respect to the sloped portion of the presser foot member. It is equipped with an intermittent pressing member.

[Function] In this invention, even if a split part is formed in the cloth, before the cloth presser member reaches the split part, the intermittent presser member presses the split part while tilting the rear cloth presser member. Send it to the department. As a result, the split portion is guided to the pressing portion of the cloth pressing member along the inclined portion without rising upward. Therefore, the presser foot member does not get caught in the split part,
It can pass over the split part smoothly.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 4.
This will be explained based on the diagram.

In the figure, 3 is the arm 4 of the articulated robot.
This is a movable sewing machine that is fixed to the machine (see FIG. 4) and can move three-dimensionally together with the arm 4, and has a needle feeding mechanism and a presser member, which will be described later. Reference numeral 5 denotes a needle bar stand whose upper end is rotatably attached to the frame of the movable sewing machine 3 about a support shaft 6; 7 indicates a longitudinal length of the needle bar stand 5 as the upper shaft (not shown) rotates. It is a needle bar that moves along the direction, and a suture needle 8 is fixed to the tip thereof. Reference numeral 9 denotes a swinging arm connected to the needle bar base 5 via a connecting link 10, and the swinging arm 9 is rotated by the swinging movement of an eccentric cam (not shown) fixed to the upper shaft. It is fixed to a swinging shaft 11 that swings.
In addition, the needle feeding mechanism is comprised by the above 3-11.

A sliding member 12 is slidably inserted into the needle bar 7, and an intermittent presser member 13 is fixed to the lower end of the sliding member. This intermittent presser member 13 has a fork-shaped lower end and is located in front of the suture needle 8 in the sewing direction (indicated by arrow A). Reference numeral 14 denotes a cam plate rotatably supported by a support shaft 15 protruding from the machine frame of the movable sewing machine 3. The cam plate 14 has a long groove 14a and a curved long hole 14b formed therein. A protruding pin 16a of a needle bar holder 16 fixed to the needle bar 7 is fitted into 14a, and a protruding pin 12a provided on the sliding member 12 is fitted into the elongated hole 14b.

Further, 17 is a motor fixed to the machine frame of the movable sewing machine 3, and 18 is a rotating shaft 1 of this motor 17.
A presser bar connected to the rotary shaft 17a via a coupling ring 19 moves up and down along a guide plate 20 fixed to the machine frame as the rotary shaft 17a rotates.
Reference numeral 23 denotes a cloth presser member rotatably attached to a connecting member 22 fixed to the lower end of the presser rod 18 about a shaft 21. This presser member 23 has a presser portion 23a having a planar shape at its lower end, and an inclined portion 23b projecting forward in the sewing direction from the presser portion 23a. Further, a pressing spring 24 is interposed between the connecting member 22 and the presser foot member 23 (see FIG. 3), so that the presser portion 23a of the presser foot member 23 is always held horizontally. ing. Furthermore, 25 is a potentiometer for detecting the vertical position of the presser bar 18, and its operating portion 25a is always pressed against the upper surface of a presser bar holder 26 fixed to the presser bar 18. In addition, 27 is the needle plate of the movable sewing machine, 28
is a cylindrical sewing machine bed to which the throat plate 27 is fixed.

Based on the above configuration, the operation will be explained next.

Here, as shown in FIG. 4, a case will be explained in which the body fabric w1 and sleeve w2 of a suit are three-dimensionally held by a fabric support 29 and are sewn. In this case, since the upper surface of the body material w1 is curved along the curve of the shoulder region, the split portion wa formed in this shoulder region is formed on the body material material w1 as shown in FIG.
It is in a state where it stands out greatly from the top surface.

During sewing, first, the overlapping portion of the body material w1 and the sleeve w2 is inserted between the throat plate 27 and the presser member 23. Of course, at this time, the cloth presser member 23, the suture needle 8, and the intermittent presser member 13 are in the raised position. Thereafter, the motor 17 is driven to lower the presser bar 18 via the coupling ring 19. The position of the presser bar 18 is detected by the potentiometer 25, and when the presser foot member 23 reaches an appropriate position according to the thickness of the body material w1, the drive of the motor 17 is stopped and the presser foot member 23 The position of is fixed. In addition, the appropriate position according to the thickness of the body material w1 referred to here means the body material w1.
This refers to the position where the cloth does not come in contact with 1 and prevents the fabric from flapping.

After setting the position of the presser foot member 23, driving of the sewing machine motor (not shown) and constant speed movement of the movable sewing machine 3 by the arm 4 of the articulated robot are simultaneously started.
Sewing operation starts. When the upper shaft is rotated by the driving of the sewing machine motor, the swing shaft 11 swings via an eccentric cam (not shown) provided on the upper shaft, and the swing arm 9 swings. The swing of the swing arm 9 is transmitted to the needle bar stand 5 via the link 10, the needle bar stand 5 swings about the support shaft 6, and the needle bar 7 also swings together. At the same time, the needle bar 7 also performs a well-known vertical movement by rotating the upper shaft. Therefore, the movable sewing machine 3 forms stitches while causing the suture needle 8 to perform a combined motion of rocking and vertical motion along the sewing direction A, that is, an elliptical motion. Therefore, even if the movable sewing machine 3 moves, the relative position between the body material w1 and the suture needle 8 passing through it remains constant, and the body material w1 is pulled by the suture needle 8 in the direction of movement of the movable sewing machine 3. You won't be disappointed. On the other hand, when the needle bar 7 moves up and down, the protruding pin 16a provided on the needle bar holder 16 moves up and down, and the cam plate 14 rotates about the support shaft 15. When the cam plate 14 rotates, the sliding member 12 slides along the needle bar 7 via the protruding pin 12a.
As a result, the intermittent presser member 13 provided at the lower end of the sliding member 12 synchronizes the synthetic movement of the sliding movement of the sliding member 12 and the swinging motion of the needle bar 7, that is, the elliptical movement, with the suture needle 8. Let's do it. Therefore, the intermittent presser member 13
intermittently presses the body material w1, and moves in the same direction as the movement direction (sewing direction) of the movable sewing machine 3 while pressing it. Therefore, even if the intermittent presser member 13 presses down the body fabric w1, the body fabric w1 is not pulled in the sewing direction A, and no fabric shift occurs. Further, when the sewing operation progresses and the movable sewing machine 3 reaches the split part wa, the split part wa is first pushed down by the intermittent presser member 13, and is pressed downward by the cloth presser member 23 located at the rear. It is guided to the inclined part 23b and further inserted between the pressing part 23a and the body material w1 along the inclined part 23b.
Therefore, both pieces of the split part wa are sutured in a proper state where they are left and right open. Note that if a stepped portion is formed in the body material w1 due to the split portion wa etc., it seems that the cloth presser member 23 which is close to the body material w1 will be caught on this stepped portion. Since the presser member 23 can be retracted upward against the pusher spring 24, it can smoothly get over the step.
The sewing operation is not hindered by the stepped portion.

Although the above embodiments have been described using a movable sewing machine as an example, the present invention is applicable to any sewing machine that has a needle feeding function, even if it is not a movable sewing machine.

[Effects of the Invention] As explained above, according to the present invention, even if a split part is formed in the cloth to be sewn, the presser member will not get caught in the split part, and the material can be sewn evenly on flat parts. There is an effect that good sewing quality can be obtained even at the split portion.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention;
Fig. 2 is a side view of the machine shown in Fig. 1, Fig. 3 is a partially enlarged front view of the machine shown in Fig. 2, and Fig. 4 is a side view showing the external appearance of the movable sewing machine applied to this embodiment. FIG. 5 is a side view showing a conventional presser member and a split portion formed in the cloth. 7... Needle bar, 8... Suture needle, 13... Intermittent presser member, 23... Cloth presser member, 23a... Presser section,
23b... Slanted part, A... Sewing direction.

Claims (1)

[Claims] 1. A sewing machine in which the sewing machine itself moves to form stitches on cloth, comprising: a needle bar that holds a suture needle; a needle feed mechanism that moves this needle bar in the vertical direction and along the sewing direction; , is supported on the sewing machine frame so that it can move up and down,
a cloth presser member, which has a presser foot at its lower end that suppresses flapping of the fabric at the seam portion, and an inclined portion extending forward in the sewing direction from the presser foot, and which moves and holds the cloth in a position close to the upper surface of the cloth when the sewing machine is driven; A sewing machine comprising: an intermittent presser member that moves in the vertical direction and along the sewing direction in synchronization with the needle bar, and whose lower end portion descends forward in the sewing direction with respect to the inclined portion of the presser member. presser foot device.