JPH0128593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a sewing machine in which the position of stitches constituting a selected pattern can be adjusted by an operating body, and a sewing machine that allows the operation range of the stitch position to be adjusted according to the pattern. This invention relates to a restriction device that restricts accordingly.

Prior Art In a sewing machine that sews a desired pattern selected from a plurality of pre-stored patterns, the stitch formation position in the selected pattern is adjusted according to the operation of an operating body, and the size of the pattern is adjusted. It is known what can be changed. However, if the adjustable range of stitch positions constituting a selected pattern is uniformly determined, various problems may occur depending on the pattern. For example, a button-setting presser foot used for button-setting is generally provided with a protrusion in the center, and adjustment operations can be made to narrow the stitch formation position, in other words, to reduce the stitch spacing in the direction of needle vibration. This causes interference between the protrusion of the presser foot and the sewing needle. Further, even if the maximum amplitude of the sewing needle does not match the maximum amplitude of the presser foot used for a particular pattern, the same problem will occur if the width of the stitch position is increased by the adjustment operation. Alternatively, with regard to the feed of the work cloth, if the feed amount of the work cloth is made infinitely small by an adjustment operation, for example, clogging will occur and the pattern will be distorted. Therefore, it is desirable to limit the range of positions in which stitches are formed in the needle vibration direction and the work cloth feed direction by the adjustment operation, depending on the selected pattern.

Purpose of the Invention The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to limit the range of adjustment of the formation position of the seams that make up the selected pattern, depending on the selected pattern. An object of the present invention is to provide a restricting device for adjusting the seam forming position in a sewing machine.

Structure of the Invention In order to achieve the above object, the present invention provides a pattern selection device for selecting a desired pattern from a plurality of predetermined patterns, and a device for adjusting the formation position of seams in the selected pattern. A sewing machine comprising: (1) a range setting means for setting a plurality of adjustment ranges in which the value of the adjustment signal changes; and (2) the selection device. (3) a limiting means for limiting the value of the adjustment signal to within the selected adjustment range; It is characterized by

Effects of the Invention With this, one adjustment range is selected by the range setting means from the plurality of adjustment ranges set by the range setting means, and is selected by the limiting means. The value of the adjustment signal is limited within the selected adjustment range. Therefore, since the range of positions where stitches are formed by adjustment operations is limited for each pattern, inconveniences such as interference between the sewing needle and the presser foot, clogging of stitches, and pattern collapse are completely eliminated.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 shows a sewing machine including an embodiment of the present invention, in which a pedestal section 12 is erected on a bed section 10. As shown in FIG. Upper arm part 1 with a head 14 at one end
6 is supported horizontally in a cantilevered manner by a pedestal 12, and at the bottom of its head 14 is a needle bar 18 that is reciprocated in the vertical direction in synchronization with the main shaft of the sewing machine (not shown), and a needle bar 18 that is reciprocated in the vertical direction A presser foot 20 is provided which can be positioned in an upper position or a lower position.
Further, a feed dog 22 is provided near the needle drop point on the bed portion 10 and is driven back and forth in the front and rear directions in synchronization with the main shaft of the sewing machine. The needle bar 18 can be swung laterally by a needle position actuator 24, which will be described later, and the feed dog 22 can also have its feeding direction and amount changed by a feed actuator 25, which will be described later. It's becoming like that. The sewing needle fixed to the needle bar 18 and the feed dog 22 work together to form a desired pattern on the work cloth.

On the front surface of the upper arm part 16, there are a large number of figures 26 corresponding to selectable patterns, and LEDs 28 disposed corresponding to the figures 26, respectively.
A pattern selection push button 30 for sequentially moving the lighting position of the pattern selection push button 30 is provided.
A desired pattern can be selected by operating the button. On the front surface of the pillar section 12, there is provided a needle position adjustment knob 32 as an operating body for manually adjusting the position of the stitches forming the pattern in the direction of needle vibration, and a needle position adjustment knob 32 for manually adjusting the position of the stitches forming the pattern in the direction of fabric feeding. A feed adjustment knob 34 is provided as an operation body for adjusting the formation position in the needle position adjustment knob 32, and an operation button 36 for enabling manual adjustment of the needle position and an operation button 36 for enabling manual adjustment are provided above the needle position adjustment knob 32. An LED 38 is provided to indicate that the workpiece is being fed, while an operation button 40 for enabling manual adjustment of the work cloth feed amount and an LED 24 for displaying that the manual adjustment has been enabled are provided above the feed adjustment knob 34. ing. Note that 44 is a push button provided on the head 14 for starting and stopping the sewing machine.

The sewing machine constructed as described above is equipped with a circuit shown in FIG. That is, the encoder 46 outputs a pattern signal SM in response to the operation of the pattern selection push button 30, and the pattern signal SM is sent to the decoder driver 48, the start address memory 50, the needle position reference magnification memory 52, and the needle position range setting memory 54, respectively. Supplied. The decoder driver 48 lights up the LED 28 located near the figure 26 that displays the selected pattern in accordance with the pattern signal SM, thereby displaying the selected pattern. That is,
The LED 28, pattern selection push button 30, decoder driver 48, etc. constitute a pattern selection device.

In order to generate a series of stitch data for forming a selected pattern, the start address memory 50 sends a start address signal SA representing the start address of the storage location of the stitch data to the stitch data generator 5.
Supply to 6. The stitch data generator 56 sequentially outputs a series of stitch data for sewing the selected pattern in synchronization with the timing pulse signal TP supplied from the timing signal generator 57. Each stitch data is composed of a pair of needle position data ND and feed data FD related to one stitch position, and the needle position data ND is supplied to the arithmetic circuit 58 and the feed data FD to the arithmetic circuit 60. .

On the other hand, from the needle position reference magnification memory 52, a reference magnification signal SMN representing a reference magnification corresponding to the selected pattern, for example, magnification "3" is supplied to the input port P1 of the multiplexer 62, and the multiplexer 62 outputs the needle position When no manual operation is performed, the input port P1 is selected, so the reference magnification signal SMN is output to the arithmetic circuit 58.
is supplied to Although not shown, a circuit similar to the circuit surrounded by the broken line in FIG. 2 is provided for feeding the work cloth, and the calculation circuit 60 has a function for manual adjustment of the feed of the work cloth, similar to the calculation circuit 58. A reference magnification signal is provided for.

The arithmetic circuit 58 multiplies the needle position data ND by a standard magnification represented by the standard magnification signal SMN, for example, a magnification of about "3", and sends a signal representing the result to the drive circuit 64.
supply to. In the drive circuit 64, the input signal is converted into an analog signal by an A/D converter built therein, and drive power is supplied to the needle position actuator 24. Similarly, the arithmetic circuit 60 multiplies the sending data FD by the reference magnification represented by the reference magnification signal and supplies the result to the drive circuit 66. Similarly to the drive circuit 64, the drive circuit 66 supplies drive power to the feed actuator 25. Stitch data generator 56
Since stitch data is outputted sequentially in synchronization with the timing pulse signal TP, the needle position actuator 24 and feed actuator 25 determine the needle vibration position of the sewing needle and the feed direction and feed amount of the feed dog 22. The selected stitches constituting the pattern are successively formed in synchronization with the rotation of the main shaft of the sewing machine (not shown).

When manually adjusting the forming position of the stitches constituting the selected pattern in the needle vibration direction, the operation button 36 is pressed and the T-shaped flip-flop 6
8 is set. The T-type flip-flop 68 outputs a signal representing its set state to light up the LED 38, and the multiplexer 62 selects the input port P2. When the needle position adjustment knob 32 is operated in this state, the output voltage of the needle position adjustment resistor 69 is changed, so that a signal corresponding to the operation amount of the needle position adjustment knob 32 is sent to the A/D converter 70. After being digitally coded, it is supplied to the encoder 72. The encoder 72 is, for example, the needle position adjustment knob 3.
The manual magnification signal SAD is classified into classes in response to the amount of operation No. 2, and the amount of operation is classified into seven levels, for example, and the manual magnification signal SAD represents a magnification of any one of 1 to 7.
is supplied to the input terminal C of the discriminating circuit 74 as comparison means and the input port P3 of the multiplexer 76 as gate means. That is, the needle position adjustment resistor 69, A/D converter 70, and encoder 72 form an adjustment device that generates an adjustment signal (manual magnification signal) SAD in accordance with the operation of the needle position adjustment knob 32.

The needle position range setting memory 54 as a range setting means has a built-in memory in which a plurality of types of adjustment ranges are stored in advance, and a maximum manual magnification signal representing the optimum adjustment range is set in response to the pattern signal SM.
SUL and minimum manual magnification signal SLL are determined by circuit 7
4 input terminals A and B and multiplexer 76
are respectively supplied to input ports P1 and P2 of. Therefore, the encoder 46 that supplies the pattern signal SM to the needle position range setting memory 54 forms range selection means for selecting one adjustment range corresponding to the selected pattern from a plurality of types of adjustment ranges stored in advance. That's what I'm doing. Note that the adjustment ranges for the plurality of types described above apply when the stitch position constituting the selected pattern is changed by manual adjustment.
This is predetermined to prevent interference between the sewing needle and the sewing needle, and to prevent the pattern from collapsing. For example, if buttoning is selected, the content of the minimum manual magnification signal SLL is assumed to represent 3x, and the maximum manual magnification signal
It is assumed that the contents of SUL represent 6 times.

The discrimination circuit 74 determines the magnification represented by the signal SAD supplied to its input terminal C, the maximum magnification represented by the signal SUL inputted to its input terminal A, and the minimum magnification represented by the signal SLL supplied to its input terminal B. A signal representing a state in which the magnification of the signal SAD supplied to the input terminal C is larger than the magnification of the signal SUL supplied to the input terminal A, and a signal representing a state in which the magnification of the signal SAD supplied to the input terminal C is larger than the magnification of the signal SAD supplied to the input terminal B A signal representing a state that is smaller than the minimum magnification of the signal SLL supplied to input terminal C, and a signal representing a state in which the magnification of signal SAD supplied to input terminal C is smaller than the maximum magnification of signal SUL supplied to input terminal A and Supplied signal SLL
A signal representing a state greater than the minimum magnification of
Let them each choose one of the following.

Therefore, when the contents of the manual magnification signal SAD are smaller than the contents of the maximum manual magnification signal SUL and larger than the contents of the minimum manual magnification signal SLL, input port P3 of the multiplexer 76 is selected, so that the manual magnification signal SAD is multiplexer 76,
The signal is supplied to the arithmetic circuit 58 via the multiplexer 62, and the formation position of the stitches constituting the desired pattern in the needle vibration direction is changed in accordance with the manual adjustment amount. However, if the contents of the manual magnification signal SAD exceed the contents of the maximum manual magnification signal SUL, the input port P1 of the multiplexer 76 is selected, and the maximum manual magnification signal SUL is supplied to the arithmetic circuit 58. Conversely, if the content of manual magnification signal SAD is smaller than the content of minimum manual magnification signal SLL, input port P2 of multiplexer 76 is selected and minimum manual magnification signal SLL is supplied to arithmetic circuit 58. As a result, the formation position of the stitches constituting the selected desired pattern in the needle vibration direction is determined by the content (magnification) of the maximum manual magnification signal SUL or the minimum manual magnification signal SLL, regardless of the operation of the needle position adjustment knob 32. is limited within the needle vibration range determined by multiplying by the position data ND. For example, if buttoning is selected, multiplexer 6
The range of the content of the signal supplied to the arithmetic circuit 58 via ND is set to be 3 times to 6 times the range, and the swinging range of the sewing needle is limited to the needle position data ND multiplied by 3 times to 6 times. be done. Therefore, the operating range of the needle position adjustment knob 32 is set for each pattern, and the discrimination circuit 74 and multiplexer 76 form a limiting means for limiting the operating range of the needle position adjustment for each pattern. be.

On the other hand, regarding the manual operation of the feed amount of the work cloth, a circuit (not shown) configured similarly to the circuit surrounded by the broken line in FIG. Regardless, the adjustment operation range is limited depending on the selected pattern. The adjustment operation range in the work cloth feeding direction is determined so as to prevent the selected pattern from clogging or collapsing.

According to this embodiment, since the adjustment operation range of the formation position in the needle vibration direction and the formation position in the work cloth feeding direction of the stitches constituting the pattern is appropriately limited according to the selected pattern, the sewing needle and the presser foot are Interference with the foot 20, clogging of the pattern, or collapse of the pattern can be suitably eliminated.

Although the embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

For example, in the above-mentioned embodiment, the manual adjustment range of the formation position in the needle vibration direction and the formation position in the workpiece cloth feeding direction of the stitches constituting the selected pattern is limited. Even if one of the manual adjustment ranges is configured to be limited, the effects of the present invention can still be obtained to some extent. Further, only one of the upper limit and the lower limit of the manual adjustment range may be limited.

In the embodiments described above, the arithmetic circuits 58 and 60
is composed of a circuit with a multiplication function,
It may also be composed of a circuit with a division function. In such a case, instead of the needle position reference magnification memory 52, a memory for storing a reference division value (for example, a value of about "1") for dividing the needle position data ND and a memory corresponding to the adjustment range of each pattern may be used. A setting memory is provided to store the maximum division value and the minimum division value, and the output signal of the encoder 72 represents a division value that varies within a range of, for example, about "0.5" to "2".

Further, it goes without saying that part or all of the circuit surrounded by the two-dot chain line in FIG. 2 may be configured by a microcomputer.

The above-mentioned embodiment is merely one embodiment of the present invention, and the present invention can be modified in various ways without departing from its spirit.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of a sewing machine including an embodiment of the present invention. FIG. 2 is a block diagram showing a circuit provided in the sewing machine of FIG. 1. 28: LED (pattern selection device), 30: Pattern selection push button (pattern selection device), 48: Decoder driver (pattern selection device), 32: Needle position adjustment knob (operation body), 34: Feed adjustment knob (operation body) , 46: Encoder (range selection means), 54: Needle position range setting memory (range setting means) (limitation means), 74: Discrimination circuit (comparison means) (limitation means), 69: Needle position adjustment resistor (adjustment device) ), 70: A/D converter (adjusting device), 72: encoder (adjusting device), 76:
Multiplexer (gate means).

Claims (1)

[Claims] 1. A pattern selection device that selects a desired pattern from a plurality of predetermined patterns, and a pattern selection device that selects a desired pattern from among a plurality of predetermined patterns, and a pattern selection device that adjusts the formation position of a seam in the selected pattern according to the operation of an operating body. A sewing machine equipped with an adjustment device that generates an adjustment signal, further comprising: range setting means for setting a plurality of types of adjustment ranges in which the value of the adjustment signal changes; and a range setting means for setting a plurality of types of adjustment ranges in which the value of the adjustment signal changes; A device for restricting stitch formation position adjustment in a sewing machine, comprising: range selection means for selecting one adjustment range; and restriction means for restricting the value of the adjustment signal to within the selected adjustment range. 2. According to claim 1, the range setting means comprises a memory that stores an upper limit signal and a lower limit signal that respectively set the upper and lower limits of an adjustment range suitable for adjusting each of the plurality of patterns. A limiting device for adjusting the stitch forming position in the sewing machine described above. 3. The range selection means is configured to read out the upper limit signal and the lower limit signal from the memory according to the selected pattern, and the limiting means is configured to read out the upper limit signal and the lower limit signal from the memory according to the selected pattern, and the limiting means reads each of the read upper limit signal and lower limit signal and the adjustment. A sewing machine according to claim 2, comprising comparing means for comparing the signals, and gate means for selecting any one of the upper limit signal, the lower limit signal and the adjustment signal according to the comparison result. Limiting device for seam position adjustment.