JPS6047864B2 - Electronic sewing machine stitch control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stitch control device for an electronic sewing machine that electronically controls the amount of needle lateral runout and the amount of material feed. By controlling both needle lateral runout and cloth feed, the sewing machine can be made compact and inexpensive.

The currently proposed stitch control drive device for electronic sewing machines is
Separate actuators are provided for needle lateral runout control and cloth feed control. However, according to this, not only the capacity of the transformer as a control drive power supply increases, but also two actuators and their control circuits are required.
This method has disadvantages such as requiring a large amount of space, increasing the size of the device, and increasing manufacturing costs. The present invention was developed in view of the above-mentioned circumstances, and as a result,
By using a single actuator to perform both needle lateral runout control and cloth feed control, the above-mentioned disadvantages are attempted to be overcome. In the figure, reference numeral 1 denotes a pulse motor that is used to drive both needle lateral runout and cloth feed control, and its bracket 2 serves as a mounting part, which is attached to the sewing machine body (not shown).
There is. Reference numeral 3 designates a pulse motor shaft, on which are pivotally mounted an arm 4 for controlling cloth feed and an internal gear 5 for operating needle lateral deflection, and a pulse motor gear 6 is fixed between these.

Reference numeral 7 denotes an intermediate gear, which is pivotally connected to a pin 8 fixed to the cloth feed operation arm 4, and is interposed between the internal gear tooth 5 and the pulse motor gear 6, and its teeth 9 are connected to each tooth 10, 11. engaged.

These sets of gears 5, 6, and 7 are used when controlling needle lateral runout.
A feed control locking mechanism 13 presses one end 12 of the arm 4 to fix rotation of the arm, forming a simple gear train, and in this embodiment, the number of teeth of gears 5, 6, and 7 is reduced. (
As for the gear 5, the circumference (converted to the circumference) is 80, 40, 20, so the gear 5 rotates around the shaft 3 with a rotational angular velocity of 1 to 2 in the opposite direction to the gear 6. During cloth feeding control, the width control locking mechanism 15 presses one end 14 of the gear 5 to fix rotation of the gear, thereby forming a planetary gear train, and the arm 4 is connected to the gear. It is designed to rotate around the shaft 3 with a rotational angular velocity of 113 in the same direction as 6. The rotation of the arm 4 is controlled by a feed link 16 and an intermediate link 1 fixedly attached to the arm 4.
A feed adjuster is adjusted via 7 to control the amount of cloth feed by feed teeth (none of which are shown). The rotation of the gear 5 controls the lateral deflection of the needle bar (not shown) via a swing rod 18 fixedly attached thereto.
Reference numeral 19 denotes a pulse motor shaft metal support, which is fixed to the bracket 2 and pivotally supports the shaft 3.

20 is metal, and 21 is an E-ring.

Reference numeral 22 denotes an amplitude sensor shielding plate which is attached integrally with the gear 5 and is designed to shield the amplitude sensor 23 from light at a specific rotational phase of the gear 5.

Similarly, a feed sensor shielding plate is attached to the arm 4 to shield the feed sensor (not shown) from light at a specific rotational phase of the arm. These sensors are used to set the initial position of the pulse motor 1. 24, 24
is a feed stopper that regulates the maximum swing of the arm 4.

Reference numerals 25 and 25 are swing width stoppers that regulate the maximum swing of the gear 5.

26 is an upper shaft of the sewing machine, 27 is an upper shaft metal, and 28 is an upper shaft screw gear, and the upper shaft rotation is converted into a right angle at a ratio of 1:1 to a locking mechanism gear 29 that is engaged with the upper shaft screw gear.

A swing width lock cam 30 and a feed lock cam 31 are attached to the gear 29 integrally with the gear 29 and stacked at different positions. The claw portion 34 of the oscillating width lock follower 33, which is freely attached, and the claw portion (not shown) of the feed lock follower 35, which has a shape that is almost symmetrical with this and is similarly attached, are respectively driven. are doing. 36 and 37 arranged similarly to this, each of the pawls is connected to the cam 30,
31 is a spring that is biased to be constantly engaged.

An adjustment plate 39 is attached to the rotation shaft boss 38 of the follower 33, which are fixed to each other by caulking portions 40, and a swing width locking member 41 is pivotally attached. The spring chamber 42 of the swing width lock member 41 receives one end of a spring 43, the other end of the spring receives the spring receiver 44 of the follower 33, and the claw 34
When the force is in the trough of the spring 30, the adjustment convex portion 45 of the locking member 41 pushes the rising portion 46 of the adjustment plate 39 against the spring 43.
The compressive force causes pressure contact in the counterclockwise direction in FIG. And the contact surface 47 of the locking member 41
is one end 14 of the gear 5 facing this
There is no contact at this time. When the pawl 34 reaches the peak of the cam 30, the follower 33 resists the spring 36.
Turn the lock member 41 counterclockwise together with the adjustment plate 39 7
After the contact surface 47 contacts the end 14, the spring 4
By compressing the spring 3, the convex portion 45 and the rising portion 46 are separated from each other, and the compressive force of the spring 43 brings the one end 14 into pressure contact with each other. Although FIG. 5 shows the swing width control lock mechanism 15, the feed control lock mechanism 13 also has a similar configuration. FIG. 6 is a block diagram of the control circuit, and the ROM in the figure is an electronic storage device that stores stitch control signals for a plurality of stitch patterns.
When a desired pattern is selected by S and the start address of the pattern signal is specified by address device AD, the needle lateral runout control signal w for the first stitch and the cloth for the next stitch are sent. The feed control signal F is output to the signal converter CV, and for subsequent stitches, a needle lateral runout control phase detector (not shown) attached to the upper shaft 26 of the sewing machine detects a high level when the needle comes out of the fabric. Each time it outputs the signal Dw, the address device advances the address in the storage device ROM and sequentially outputs each control signal W, F for the next stitch, and outputs the last stitch control signal of the pattern. After outputting, a signal is output repeatedly to return the address to the beginning.

The signal converter CV receives control signals W for needle lateral runout and cloth feed.
, F as new data for each stitch, the data constituted by the control signal for the previous stitch or the initial data that is reset to O when selecting a pattern (this is called old data) The difference between the two data, that is, the amount of change in the new data relative to the old data, is calculated and outputted to the multiplexer (2) as data W'' and F''. FF is JK
A flip-flop circuit receives signals DW and DF from the needle lateral runout control phase detector and a cloth feed control phase detector (not shown) similarly attached to the upper shaft 26 at terminals J and K; As shown in FIG. 7, each of these signals is as shown in FIG. The cloth feed control phase detection signal Dp is at a high level in an area less than 180 degrees centering approximately on the phase when the needle is at the top dead center, and similarly, the cloth feed control phase detection signal Dp is at a high level in an area less than 180 degrees centering approximately on the phase when the needle is at the bottom dead center.
The terminals J and K that receive these are both low level or only one is high level, and when the terminal J is high level, the output Q is set to high level and the multiplexer Input to mode switching terminal M of MP and output needle lateral runout control data w'' to output 0UT to pulse motor driver DV-, and when terminal K is at high level, output Q
is set to a low level and cloth feed control data F'' is output to output 0UT.Pulse motor driver D■
is adapted to drive the pulse motor 1 with a driving amount based on the data W'' and F'' each time the data W'' and F'' are output from the output 0UT. FIG. 7 shows that the amplitude control lock mechanism 15 and the feed control lock mechanism 13 are connected to the cam 30, respectively, in response to the detector signals Dw and DF.
31 and the followers 33 and 35, the rotation of the gear 5 and the arm 4 is fixed based on the engagement between the gear 5 and the arm 4. Each high level is a fixed phase, and each low level is a released phase.

In the above configuration, when the sewing machine rotates and the needle lateral runout control phase detector signal Dw becomes a low level at point a in FIG. It is controlled to a control position for forming a stitch, and is held at that position thereafter.
Subsequently, at point b, the claw portion 34 of the swing width lock follower 33 reaches the peak of the swing width lock cam 30, and the contact surface 4 of the swing width lock member 41 that constitutes the swing width control lock mechanism 15 is reached.
7 presses one end 14 of the internal gear 5 for needle lateral vibration operation to fix the gear 5 at the control position. Therefore, the needle lateral deflection position is fixed thereafter. Subsequently, at point c, a similar feed control locking mechanism 13 releases the cloth feed control operating arm 4 from its fixed state. The storage device ROM is the pattern selection device P. At the operation of S or at the rising point of the signal Dw before 06 (not shown in FIG. 7), the needle lateral runout control signal w for the first stitch and the cloth feed control signal F for the next stitch are input. is output, and d following the above c point
When the cloth feed control phase detector signal DF becomes high level at the point, the mode switching signal M of the multiplexer Raccoon makes the cloth feed control data F'' valid, and the pulse motor 1 rotates based on that data. The rotation of the pulse motor gear 6 due to the motion causes the intermediate gear 7 engaged therewith to rotate, and the intermediate gear rotates along the internal gear 5 that is engaged with it and is fixed. The cloth feed control operating arm 4 to which the shaft 8 is attached is rotated through a rotation angle of 113 in the same direction as the gear 6, and the cloth feed control arm 4 is rotated through a rotation angle of 113 in the same direction as the gear 6, and The feed amount is controlled.At point e, where the sewing machine rotates further and the signal DF becomes low level, the pulse motor 1 has already finished the cloth feed control and is held at that position, and at the subsequent point f, the pulse motor 1 is held at that position. The feed control locking mechanism 13 fixes the arm 4 in the feed control position.Subsequently, the fixation of the gear 5 is released at point g, and when the signal Dw becomes high level at point h, new data from the storage device ROM is read out. At this time, the mode switching signal M enables the needle lateral runout control data W'',
The pulse motor 1 rotates based on the data. The rotation of the pulse motor gear 6 due to the rotation of the pulse motor rotates the intermediate gear 7 engaged therewith, and since the center of rotation of the intermediate gear is fixed together with the arm 4, the intermediate gear rotates the gear 5. . The gear 5 rotates at a rotational angular velocity of 11 f2 in the opposite direction to the gear 6, and controls the horizontal deflection of the needle via the swing rod 18 and the like. Next, to explain the data and its processing when actually forming the stitch pattern as shown in Fig. 8, Fig. 9 is a flowchart of control, and the power supply for control 5 of the control circuit shown in Fig. 6 is turned on. and each element is initialized.

Then, whether the signal Dv of the needle lateral runout control phase detector has a rising dimension as at point h in FIG. If it is immediately after the operation of S, it is determined whether this is a high level. If the level is high immediately after the operation of O, the start address of the selected pattern, that is, address N of the table in this case, is designated and data 10 and 30 of data W and F in the storage device ROM are read out. The value of w is the needle lateral runout coordinate data in FIG. 8 expressed in w-adic numbers, and the value of F is data similarly indicating the amount of cloth feed. In order to convert the values of W and F into control signals w'' and F'' for the pulse motor 1, the converter C sets these W and F as next-order data,
In addition, in the initial setting, the current data of these W and F are set to 0, 0, and the calculation for determining the rotation amount of the pulse motor in the next process, that is, w'' = next data W
The current data W becomes the next data 10. Since the mode switching signal M is at a high level, the multiplexer outputs this data W'' to the pulse motor driver DV, and the pulse motor 1 changes the needle lateral runout position to the position corresponding to the coordinate 0 in FIG. The lateral runout operating gear 5 is moved to correspond to the coordinate 10. This is the coordinate of the first stitch (number 0).Then, in order to perform the calculation for the next stitch control, the next data W is used as the current coordinate. It is replaced as data W. If the signal DF of the cloth feed control phase detector is at a high level, it is the feed control phase, and the data F indicating the cloth feed amount read above from the storage device ROM is the needle lateral runout coordinate. Processed in the same way as 2 in data conversion and calculation.
For example, if you want to specify a constant cloth feed amount for each stitch, use F.
'' = Next F = Current F = 0, in that case, specify the cloth feed amount such that the stitches of the cloth feed operation arm 4 have a constant inclination to each other,
When the fabric feed amount differs between stitches, the difference is measured by pulse motor 1.
2 controls. The values of F related to fabric feed in Figure 8 and the table are 15 for fabric feed, 010 for maximum reverse feed, and 30 for maximum forward feed. Maximum feed is executed.Similarly to the above, when current F=next F is executed, the address of the 3 storage device ROM is advanced by 1 and returns to return point 1.The progression of this address is determined by the selected pattern N in the table. Advance the stitch number from N (A) to N+5 (5), and shift the timing of data WI:.F to enable it, and finally when it reaches N+6, 3. Specify the stored content to be repeated. The signal RET returns to address N, and the stitch pattern is repeatedly formed.As described above, according to the present invention, one control motor is used commonly in the mechanism for controlling needle lateral runout and fabric feed amount. As an actuator, the connection and switching between this and each of the control mechanisms described above is relatively simple and reasonable, and the switching and driving are reliably achieved through cooperation between electrical control and mechanical control, and This invention contributes to the miniaturization of equipment, labor saving, and cost reduction, and is a highly effective invention in industrial terms.

゛Brief explanation of the drawings Fig. 1 is a schematic diagram of a stitch control drive mechanism showing an embodiment of the present invention, Fig. 2 is a diagram of its gear engagement relationship, and Fig. 3 is a diagram showing the mechanism shown in Fig. 2.
Fig. 4 is a bottom view of Fig. 1, Fig. 5 is a partially exploded view of Fig. 1 or Fig. 4, Fig. 6 is a block diagram of the electric control circuit, Fig. 7 is a phase diagram of control. The relationship diagram, FIG. 8 is a pattern example, and FIG. 9 is a flowchart for explaining control.

In the figure, the pulse motor 1 is an electromagnetic actuator, the arm 4 for controlling cloth feed and the internal gear 5 for activating needle lateral vibration are oscillators, the pulse motor gear 6 is a motor gear, and the feed control lock mechanism 1
3 and the swing width control lock mechanism are control lock mechanisms, the ROM is an electronic storage device, and the signal Dw of the needle lateral runout control phase detector and the signal Dp of the cloth feed control phase detector are needle vertical phase signals.

Claims (1)

[Claims] 1. In a sewing machine that electronically controls the amount of needle lateral runout and the amount of cloth feed, means for generating a phase signal related to the vertical movement phase of the needle for each stitch in synchronization with the rotation of the upper shaft of the sewing machine; an electronic storage device that stores stitch control signals related to the amount of cloth feed and is prepared such that the stitch control signals are read out for each stitch according to the phase signal; and position control of each stitch. a single electromagnetic actuator that is actuated alternately with predetermined control amounts based on stitch control signals of the needle lateral runout amount and the cloth feed amount read out from the electronic storage device; A motor gear fixed to a drive shaft by an electromagnetic actuator, and two oscillating bodies that respectively oscillate a feed operation mechanism and a needle lateral vibration operation mechanism with the drive shaft as the oscillation center, one of which oscillates. An intermediate gear that engages with the motor gear is pivotally attached to one end of the moving body,
At one end of the other oscillator, each oscillator forms a gear that engages with the intermediate gear, and each oscillator operates in synchronization with the rotation of the upper shaft of the sewing machine to control the other end of each oscillator through the alternating operation. A stitch control device for an electronic sewing machine, which is provided with a control lock mechanism that alternately locks the stitches in correspondence with the stitch control mechanism.