JPS6311918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing machine that is driven by preprogrammed data to obtain a desired pattern, and particularly relates to an improvement in its presser device.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. In the figure, 1 is the sewing machine head;
It has a needle 2 and a sewing machine bed upper surface 3. Reference numeral 4 denotes a hinge, which serves as a pivot point for tipping over the sewing machine head 1 when maintaining the lower part of the sewing machine bed.
Reference numeral 5 denotes a sewing machine table, which has the same surface as the bed upper surface 3 and on which the sewing machine head 1 is placed. 6 is an XY table device, which is attached to the sewing machine frame 7. 8 is
It is an XY table stand, with pillars 9 fixed at the four corners. 10 is an X guide shaft fixed to the support 9;
11 is a Y guide shaft fixed to the support column 9, 12
An X-movement table is fitted onto the X-guide shaft 10 so as to be slidable in the X direction, and an X-movement shaft 13 is fixed to this. Reference numeral 14 denotes a Y moving table which is fitted onto the Y guide shaft 11 so as to be slidable in the Y direction, and a Y moving shaft 15 is fixed to this.

An X drive belt 16 is attached to the lower end of the X moving shaft 12. One end of this belt is wound around a rotating pulley that is supported by a bracket 17, and the other end is fixed to the shaft of an X stepping motor 19. It is wrapped around a pulley. A Y drive belt 21 is attached to the lower end of the Y moving table 14. One end of this belt is wound around a rotating pulley that is supported by a bracket 22, and the other end is fixed to the shaft of a Y stepping motor 24. It is wrapped around a pulley.

Reference numeral 26 denotes an XY movable base having orthogonal holes 27 and 28 into which the X movement axis 13 and the Y movement axis 15 are slidably inserted, respectively. 29 is a cloth presser device, 30 is a presser frame, and an upper presser plate 31 is provided at the tip.
is swingably connected by a bearing plate 32 and pin 33 fixed to the upper presser plate 31, and the other end is connected to a presser mounting base 34 which is fixed to the XY movable base 26 with a washer 43 and a screw 44. It is fixed with screws 36 to both ends of a rotation shaft 35 that is supported and rotated. A presser lever 37 has one end connected to a mounting plate 39 fixed to the presser mounting base 34 with a screw 38 with a pin 40, and the other end of an air cylinder 41 connected with a pin 42, which is fixed to the rotating shaft 35. There is. 45
is a lower presser plate and is fixed to the presser mounting base 34 with screws 46.

Next, the operation will be explained.

When a workpiece to be sewn is placed on the lower presser plate 45 and a switch (not shown) is pressed, the air cylinder 41 is actuated, and the presser frame 30 is lowered using the rotation shaft 35 as a fulcrum via the presser lever 37, and the presser frame 30 is lowered to its tip. A workpiece to be sewn is held between an upper holding plate 31 attached to a bearing plate 32 which is swingably connected by a pin 33.

Furthermore, when another start switch (not shown) is pressed, the presser foot mounting base 34 of the cloth presser device 29 is attached.
In the XY movable base 26, signals stored in a memory element such as a PROM are sent to the X stepping motor 19 and the Y stepping motor 24, and each pulley provided on the X stepping motor 19 and the Y stepping motor 24, The belts 16 and 21 wrapped around these pulleys operate to move the X moving table 12,
The Y moving table 14 operates in the X direction and the Y direction, respectively, and is slidably attached to the X moving shaft 13 and Y moving axis 15 attached to the X moving table 12 and the Y moving table 14, respectively, so that the , operated in the Y direction. The presser foot device 29 attached to this XY movable base 26 uses a memory element such as PROM to operate the
an X stepping motor 19 in the direction and the Y direction;
It is operated by a Y stepping motor 24 and is controlled so as not to operate while the needle 2 is below the object to be sewn. That is, the presser foot device 29 moves intermittently in conjunction with the sewing machine head 1.

An XY table device 6 that operates a conventional sewing machine head 1 and a cloth presser device 29 that operates intermittently,
Due to the size of the sewing machine head 1 and the workpiece, it must be installed at the rear of the sewing machine head 1, and therefore, the of device 6
The distance to the XY movable base 26 becomes longer and the presser frame 3
The left and right direction of 0 is the presser foot mounting base 3 at both ends of the rotation shaft 35.
Although the outer end surface of the boss No. 4 and the inner end surface of the presser frame 30 are regulated so that there is no looseness, the left and right stop portions and the presser foot portion where the actual sewing is performed are located far apart, so it is difficult to avoid this, especially when the sewing machine is running at high speed. When being driven
The intermittent movement of starting and stopping the presser foot device 29 from the XY table increases inertia, which causes lateral wobbling of the workpiece, especially in the X direction, leading to uneven stitches, poor sewing quality, and needle breakage. However, there were drawbacks such as defects in the sewing object and reduction in sewing efficiency.

This invention eliminates uneven seams, poor stitching tension, broken needles, etc. even during high-speed operation by providing a steadying device on the presser frame in order to prevent horizontal vibration (vibration) of the presser foot device as described above. The purpose is to provide an automatic sewing machine that can improve efficiency.

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same or equivalent parts as in the conventional device are designated by the same reference numerals, and the description thereof will be omitted.

In FIGS. 3 to 5, 50 is a presser device;
51 is a presser foot mounting base, and this presser foot mounting base 51 includes:
A stepped portion of a stepped pin screw 53 having flat portions 52 on both sides is inserted and fixed with a nut 54 . 5
Reference numeral 5 denotes a presser frame, which has two forked parts 57 on the opposite side to the upper presser plate 31 and lower presser plate 45 with respect to the insertion hole 56 of the rotational shaft 35, and is bored parallel to the rotational axis 35. A steady pin 59 is fixed to the presser frame 55 by a screw 60 in the hole 58 . As shown in FIG. 3, the steadiness of the presser frame 55 in the left-right direction is restricted by the inner end surface of the rotating shaft 35 of the presser frame 55 and the outer end surface of the rotating shaft of the presser mount 51, and further by the presser mount mount. 51
Both sides of the flat part 52 of the stepped pin screw 53 fixed to the holding frame 55 are regulated by the end faces of two steady pins 59 inserted into the holes 58 of the forked part 57 of the presser frame 55. In addition, the stepped pin screw 53 and nut 5
4. The forked portion 57 of the lower press plate 45, the hole 58, the steady pin 59, and the screw 60 constitute a steady steady device.

As described above, in this invention, the presser foot device is provided with a steady stop device on the opposite side of the presser foot mounting base and the rotation shaft of the presser frame, as well as the upper presser plate and the lower presser plate. Even when the XY table device, which performs intermittent starting and stopping movements in conjunction with the machine section, moves at high speeds, the above-mentioned steadying device prevents lateral slippage, and prevents uneven seams of the workpiece, poor sewing condition, and broken sewing machine needles. This has the effect of improving sewing efficiency.

[Brief explanation of the drawing]

Figures 1 and 2 are for explaining a conventional automatic sewing machine. Figure 1 is a plan view of the machine, Figure 2 is an exploded perspective view of the presser foot device, and Figures 3 to 5 are of this machine. 3 is a plan view thereof, FIG. 4 is a perspective view thereof, and FIG. 5 is an exploded perspective view of a presser foot device. In the figures, the same reference numerals indicate the same or equivalent parts, 1 is the sewing machine head, 2 is the needle, 6 is the XY table device, 26 is the XY movable table, 50 is the presser foot device,
51 is a presser foot mounting base, 53 is a stepped pin screw, 55 is a presser frame, 57 is a fork, 59 is a steady pin, 35
31 is an upper presser plate, and 45 is a lower presser plate.

Claims (1)

[Claims] 1 Based on the signal stored in the memory element, the specified feed amount is set while the needle of the sewing machine is above the top surface of the bed, and the feed amount is zero while the needle of the sewing machine is lowered from the top surface of the bed. In an automatic sewing machine that is driven intermittently, the fabric feeding device of this sewing machine is
An XY movable base that is driven in the X-axis and Y-axis directions on a plane, a presser mount attached to this movable base, a lower presser plate attached to this presser mount, and a presser frame connected to the presser mount. and a presser foot device having an upper presser plate which is attached to be openable and closable with the lower presser plate and which presses and clamps the workpiece between the presser foot plate and the presser frame. At the connection part, the connection member attachment part formed on the presser frame is brought into contact with the presser frame, and a forked part is formed at the tip of the presser frame on the opposite side to the upper presser plate; An automatic sewing machine having a structure in which a pin to be attached to the presser frame mounting base is disposed within the fork, and the pin is held by a steady pin inserted into a hole formed in the fork of the presser frame. .