JPS62713B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine that automatically sets sewing conditions to be determined before operating a sewing machine at the same time as pattern selection.

That is, through the operation of a selection device in the sewing machine, a pre-arranged electric control signal drives an electric drive device that automatically controls the cloth feed adjustment mechanism, and adjusts the height of the feed dog, the amount of needle swing width, and the needle on the throat plate. The present invention relates to an automatic control device for a sewing machine that automates preparation work for sewing work using a sewing machine by setting at least one of the hole sizes and the like to various states.

(Objective) The object of the present invention is to provide at least one adjustment mechanism for adjusting the height of the feed dog, the amount of needle oscillation, the size of the needle hole on the throat plate, etc. in preparation for sewing work. Another object of the present invention is to provide the adjustment mechanism to an electrical control device for cloth feeding, so that when the control operation by the device is stopped, that is, when the sewing machine is not operating. The purpose of the present invention is to simplify the adjustment mechanism by configuring the adjustment mechanism to be operated by the control device when the vehicle is at rest, thereby reducing the size of the control device.

(Features) In view of the above object, the present invention provides a sewing machine in which the cloth feed is automatically controlled to form stitches in response to an electrical control signal, in which the cloth feed is controlled by an electric drive device that controls the cloth feed mechanism. An adjuster, a drive pin, and a group of adjustment cams for selecting and maintaining an optimum state for desired sewing are arranged, and when the sewing machine is not operating, the drive pin is rotated beyond the adjustment effective range of the cloth feed adjuster. When the sewing machine is in operation, the fabric feed adjuster is rotated together with the adjusting cam group, and the cam group is held at the selected position, and when the sewing machine is running, the cloth feed adjuster is returned to an effective adjustment range. be.

(Structure) The present invention will be described below based on an embodiment shown in the drawings. Reference numeral 1 denotes a lower shaft rotatably supported within the bed machine frame and driven by a main shaft (not shown);
A gear 1A fixed to the shaft rotates a cam shaft 4 to which a horizontal cam 2 and a vertical cam 3 are fixed via a gear 1B.
As is clear from the figure, there is a fork link 6 that engages with the feed fork 5 pivotally mounted on the feed arm shaft 21 and is articulated to the end of the fork, a horizontal feed link 7, and one end of which is connected to the feed arm shaft 21. It is fixed to the horizontal feed arm 8 and then to the horizontal feed table 9.
The feed plate 13 to which the feed dog 12 is attached is swung through the feed plate, and the amount of swing of the feed plate is determined by the square piece 10 inserted between the forked link 6 and the horizontal feed link 7. It is designed to change according to the rotational displacement of the feed adjuster 11.

Further, the vertical cam 3 is connected to the feed base 13 via a vertical feed arm 14 and a vertical feed roller 15 shown in FIG.
is moved up and down and combined with the horizontal feeding movement to perform a four-sided cloth feeding movement.

16 is a step motor as an electric drive device for feed control, and a drive pin 1 is attached to the rotating shaft 17 of the step motor.
1' is fixed to the end bracket 1 fixed to the end of said motor 16;
An adjustment cam group 18 is fitted onto the outer peripheral portion of the bearing 6', and is rotated by the rotation of the drive pin 11'.
The adjusting cam group 18 includes a position adjusting cam 18A for adjusting the position of the feed dog 12 for straight stitch S, zigzag stitch Z, feed dog lowering D, and basting stitch SD, as shown in FIGS. 5 and 6. The needle plate needle hole switching, needle position fixing, and release cam 18B, and the above-mentioned S, Z, D,
The SD is composed of a position holding cam 18C having a cutout at the selected position, and each cam is provided with a driven lever 19, 20 and a positioning lever 32 opposite to each other. As shown in FIGS. 1 and 2, one end of an adjustment lever 22 is engaged with one end of the driven lever 19 corresponding to the adjustment cam 18A, and an adjustment rod 23 is connected to the other end of the lever. A drop lever 24 is connected to the end thereof, and the other end of the lever is fitted to the cam shaft 4 so as to be able to freely slide on the shaft, and is always biased in one direction by a spring 25. ' is engaged. Therefore, due to the rotation of the cam 18A, the drop lever 2
4 is activated, the vertical cam 3 slides on the shaft 4 and is disengaged from and engaged with the vertical feed arm 14, making it impossible to transmit the vertical movement to the feed base 13, and the vertical movement transmission becomes possible. The adjusting lever 22 is configured such that one end thereof is always engaged with the end of the driven lever 19 by the action of a spring 24' stretched on the drop lever 24. Further, at the other end of the driven lever 20 that engages with the cam 18B, as shown in FIGS. 1 and 3, there is provided an adjustment lever for switching the needle hole 30'' of the throat plate 30' between straight sewing and zigzag sewing. One end of the lever 26 is always engaged by the action of the spring 28, and the other end of the lever 26 is engaged with one end of the throat plate lever 27. A needle hole switching plate 30 facing the surface of the needle plate is connected to a connecting needle plate operating plate 29.

The sewing machine of this embodiment is in the state shown in FIG. 4, that is, with the center of the square piece 10 aligned with the axis of the rotating shaft 17 of the feed adjuster 11, and the needle is moved as shown in the motion diagram of FIG. The top stop needle (stops at top dead center) and horizontal feed are made to stop at the neutral point. Rotating shaft 17 of the feed adjuster 11
The drive pin 11', which is rotated around the center, is fitted into an arcuate groove 18A' provided in the side surface of the cam 18A of the adjustment cam group 18, as shown in FIG. 7, and the sewing machine is stopped. When the step motor 16 is driven to rotate the feed adjuster 11 beyond the effective feed adjustment range F,
While contacting either end of the arcuate groove 18A', it rotates together with the adjusting cam group 18 and is stopped at a predetermined position. At the predetermined stop position, the positioning lever 32 is engaged with one of the notches S, Z, D, and SD of the cam 18C of the adjustment cam group 18, so the adjustment cam group 1
8 is held in the selected position. After the drive pin 11' has rotated the adjusting cam 18, it is returned together with the feed adjuster 11 into the effective feed adjustment range F.

As shown in FIGS. 1 and 11 to 13, the upper end 20' of the driven lever 20 is connected to a projecting portion 34'' of an end bracket 34' of a step motor 34 as an electric drive device for amplitude control. The lower end of the attached actuating lever 33 is engaged, and the upper end of the actuating lever is engaged with one end of a positioning actuating lever 35 pivotally connected to the end bracket 34'. A positioning arm 37, which is pivotally connected to the same shaft 35' as the operating lever 35, is held apart from the amplitude adjusting arm 38 by a spring 36 that is engaged with the lever. An operating lever 33 that is linked to the driven lever 20 that operates according to the cam 18B.
It is actuated in the direction of releasing the engagement with the positioning arm 37 which is pivotally mounted on the same axis. The positioning arm 37 is pressed by a spring 39 to a notch 38' of a width adjusting arm 38 whose one end is fixed to the rotating shaft of the step motor 34. It is set so that it engages with one end of the positioning arm 37 only when it is lowered. Therefore, unless the positioning arm 37 is actuated via the driven lever 20 and the operating levers 33 and 35 in accordance with the rotation of the adjustment cam group 18, it will not come off from the notch 38' and the needle position M will be maintained.
is held.

The adjusting lever 26 for changing the needle hole in the throat plate is operated simultaneously by the driven lever 20 together with the operating lever 33, so switching the needle hole in the throat plate to a straight line and fixing the needle position can be done at the same time. It is designed to be carried out and reliably maintained. Sho 50
is a swing rod, 51 is a needle bar swinging arm, and 52 is a needle bar.

Figures 14 to 16 show other embodiments of the present invention, which relate to a structure in which a control device for each part is added to the feed adjustment section of a sewing machine when a needle upper position stop device (not shown) is not installed. A drive pawl 40 is attached to the rotating shaft 17 of the step motor 16 for controlling and driving the feed.
An adjusting arm 41, which is pivotally connected to the feed adjuster 11 and the pin 42, is fixed, and an adjusting arm 43, which integrally fixes the feed adjuster 11 and the pin 42, is rotated by a swing shaft 44 fitted to an extension 49 of the mechanism base. The side surface of the adjustment arm 41 and the outer periphery of the pin 42 of the adjustment arm 43 are brought into pressure contact by the action of a spring 45 that is engaged with the adjustment arm 43. The axis of rotation of the step motor is made to coincide with the rotating shaft 17 of the step motor.

The adjustment arm 43 is limited by the cooperation of a spring 45 whose other end is locked to an arm integral with the mechanism base and a stopper 46 whose tip, which is fixed to an extension 49 of the mechanism base, abuts against the side surface of the adjuster 11. As shown in FIG. 16, the limit position of the stopper 46 is within the feed adjustment effective range F.
When the step motor 16 is controlled and driven within the effective range, the feed adjuster 11 is rotated through the adjustment arm 41 and the pin 42 that is in pressure contact with the arm. The feed movement is adapted to be regulated. Furthermore, as shown in FIG. 17, the adjustment actuating arm 41 can be rotated in the + direction, that is, in the direction away from the pin 42 of the adjustment arm 43, even outside the effective adjustment range F, and this rotation causes the drive claw 40 to be rotated against the step motor. Drive tooth surfaces 47 at approximately 180° intervals formed on the outer periphery of a drive cam 47 fixed to the end of the adjusting cam group 48 fitted to the outer periphery of the bearing of the bracket 16' fixed to the end of the bracket 16'.
a driven lever 19 that is engaged with either cams A or 47B to rotate the adjustment cam group 48 clockwise, and engaged with cams 48A and 48B of the cam group;
20 to automatically adjust the height of the feed dog, the size of the needle hole in the throat plate, and the drop position of the needle. The adjustment cam group 48 has a straight stitch selection position.
S', zigzag stitch selection position Z', feed dog lowering position D,
Although each position of the basting position SD is not shown, each of these positions should be shown in the same way as in the first embodiment, and furthermore, the adjustment cam group 48 is provided with a notch for holding each position. A cam 48C is also provided in the same manner.

The drive cam 47 drives the drive gears 47A and 47B.
Two cams 48A and 48B are installed at 180° intervals.
Since S, Z, D, SD and S', Z', D', SD' of each sewing condition position are consecutively provided between , the currently selected sewing condition position, for example straight stitch S, If zigzag Z is selected in the set state, the motor does not have to rotate 315 degrees to the Z position, but only needs to rotate 135 degrees to the previously set Z′ position. Therefore, the selected speed can be made faster. It is made to do so.

The driving pawl 40 is rotated to a predetermined position by the step motor 16 in this manner, thereby rotating the adjustment cam group 48 to set each sewing condition. After setting, the driving pawl 40 is rotated by the step motor 16. Although the adjustment cam group 48 is returned to its original position, the set position is maintained. The relationships of signals or actions to each mechanism of the present invention are transmitted and controlled by a command system as shown in the block diagram of FIG.

(Function) The present invention is constructed as described above, and its function will be explained below.As shown in FIGS. A square piece 10 provided at the end of the forked link 6
is made to slide in the groove of the feed adjuster 11,
When the inclination angle of the groove is adjusted within the angular range F by the control of the step motor 16, the horizontal feed movement is controlled. Next, when a certain sewing method is selected, the axis of the rotating shaft 17 of the feed adjuster 11 is aligned with the axis of the square piece 10 as shown in the fourth figure while the operation of the sewing machine is stopped, and in this state, When the pin 11' or 42 is rotated by the pulse motor 16 to a predetermined angle beyond the feed adjustment effective range F shown in the figure, the adjustment cam group 18 is moved by the drive pin 11' or 42 to the position shown in FIG. 7 or 18. When rotated as shown in the figure and set to the positions S, Z, D, and SD for each sewing condition, that state is maintained by the cams 18C and 48C and the positioning lever 32. Therefore, each sewing condition is determined by the driven lever 19,
20, the feed dog is in a depressed state D, the throat plate needle hole is in a straight sewing state S or zigzag sewing state Z, and the needle drop position is at a specific position such as the middle base line, and the straight sewing state S or zigzag sewing is possible. When these are combined, for example, the feed dog sinks and the needle hole and position of the throat plate are adjusted to the straight sewing state SD. After setting the desired sewing conditions, the drive pin 11' or 42 is returned to its original position, and the feed adjuster is moved to the effective adjustment range F.
This acts to enable rotation within the shaft. In addition, in the present invention, the power switch of the sewing machine is
When turned ON, the adjustment cam group 18 is always locked in the S position to the driven levers 19, 20, and is set in a state in which straight sewing work is possible.

(Effects) Since the present invention is configured and operates as described above, each sewing condition is automatically set at the same time as a desired stitch including a sewing pattern is selected, so that various sewing conditions can be set as in the conventional method. In addition, when the feed control motor is not being driven to control the feed movement, that is, when the sewing machine is stopped, the height of the feed dog, the needle hole in the throat plate, and the needle can be adjusted. The needle bar width control motor can be used to adjust the position, and the needle bar width control motor can be used to control the needle bar width. Since it is used only for amplitude control, the torque is small and it can be made compact. In addition, since the cam for setting sewing conditions is arranged concentrically with the rotating shaft of the feed control motor, the adjustment mechanism for automatic adjustment and the adjusted mechanism are located very close together, making it possible to omit related parts. Therefore, the volume can be made extremely small, and since the needle position is fixed and the needle hole on the throat plate is mechanically adjusted, there is no need for an electrical needle position holding mechanism. Since it is constructed so that fixing and adjustment of the throat plate needle hole can be performed simultaneously, there is no risk of damage to the sewing machine because only one is activated and the other is not activated, and this brings about various effects, such as making it easier to use the sewing machine. This is an extremely important contribution to the improvement of sewing technology.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the needle hole in the throat plate, the automatic feed adjustment section, and the swinging section of the needle bar of a sewing machine embodying the present invention, and FIG. 2 shows the main parts of the fabric feed control mechanism of the present invention. 3 is a plan view showing the main parts of the throat plate needle hole adjustment mechanism of the invention, FIG. 4 is a front view of the main parts of the cloth feed control mechanism of the invention, and FIG. 5 is a feed dog of the invention. FIG. 6 is a front view of the main parts showing the adjusting cam of the present invention; FIG. 7 is a diagram of the relationship between the driving pin and the adjusting cam of the present invention; FIG. 8 is a front view of the main parts showing the adjusting cam of the present invention; 9 is a developed view showing the rotation range and direction of the drive pin corresponding to the selected sewing conditions of the present invention, and FIG. 9 is a motion diagram showing the phase and horizontal feed movement of the upper stop needle in one embodiment of the present invention. FIG. 10 is a control command block diagram of the automatic adjustment of the present invention;
12 and 13 are a plan view and a side view of the essential parts of the needle position fixing device of the present invention, respectively.
19 are diagrams showing other embodiments of the present invention, and FIG. 14 is a cloth feed control mechanism according to another embodiment of the present invention. FIG. 15 is a sectional view taken along line A-A' in FIG. The figures are a view taken in the direction of arrow B in Fig. 14, Fig. 17 is a front view showing the feed dog height adjusting cam of the present invention, Fig. 18 is a diagram showing the relationship between the drive pin and the adjusting cam of the present invention, and Fig. 19 is FIG. 3 is a developed view showing the rotation range and direction of the drive pin corresponding to selected sewing conditions of the present invention. 11 is a feed adjuster, 11' and 42 are drive pins, 16 is an electric drive device, 17 is a rotating shaft, 18
and 48 are adjustment cam groups.

Claims (1)

[Claims] 1. In a sewing machine that automatically forms stitches in response to an electrical control signal, a drive pin that is rotated to a predetermined position by the drive device is fixed to the rotating shaft of an electric drive device that controls the cloth feed movement mechanism. and a group of adjustment cams are fitted therein to set desired sewing conditions in conjunction with the rotation of the drive pin in connection with the operation of the pattern selection means, and the drive pin is rotated by the electric drive device. The desired selection is made by rotating the adjusting cam group together with the adjusting cam group in an area beyond the effective adjustment range of the cloth feed adjuster, and engaging the positioning lever with the notch of the integral position holding cam. An automatic adjustment device for a sewing machine, wherein the drive pin is held in position, and when the sewing machine is operating, the drive pin is returned to an effective adjustment range of the cloth feed adjuster by the electric drive device.