JPS5815158B2 - Sewing pattern selection device for sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sewing pattern selection device for a sewing machine.
The purpose of this is to make the sewing pattern selection operation extremely simple and to make the setting time from the selection operation to the completion of pattern setting extremely short. To simply configure a sewing pattern selection mechanism and to allow the selection mechanism to operate extremely quietly.

In the conventional sewing pattern selection device of a sewing machine, which operates a single operating member using either a mechanical or electrical mechanism, the instruction or indicator lamp is turned on by operating the operating member until the display position of the desired sewing pattern is displayed. Since the sewing machine must be moved, the amount of operation increases as the number of sewing patterns increases.
It also required a lot of operating time.

In addition, in the case of the push-button type that directly selects the desired sewing pattern, the number of cam followers and other related mechanisms increases, making the structure more complicated, making the limited space of the sewing machine frame increasingly narrow, and reducing the weight. There were shortcomings such as going against the measures to promote

The present invention eliminates the above-mentioned drawbacks of conventional sewing machines, and its construction will be explained below with reference to the drawings.

In the arm bed frame of the sewing machine, there is a mechanical sewing pattern memory 1 that is synchronized with the rotation of the main shaft (none of which are shown) and stores a plurality of sewing patterns, such as a group of disk-type laminated cams. An output take-out member 2, for example a cam follower, for outputting information stored in the sewing pattern memory 1 is disposed facing the memory 1 so as to be selectively movable therein.

That is, the cam follower, which is the output extraction member 2, is fitted in such a way that it can move linearly and parallel to the plurality of memories, and the boss part 3 of the follower can slide on the shaft 4. The formed cutout groove 5 holds a horizontal shaft 8 supported by a pair of arm members 6.7 rotatable about the shaft 4, and the boss portion 3 is provided with a groove 9 in the circumferential direction. There is.

A bifurcated arm 10 is extended from the other arm member 7,
A short shaft 13 of a horizontally swinging arm 11 swinging about a pivot 12 is fitted into the armature.

A sliding pin 16 provided at an appropriate position on the swinging rod 15 is pressed against the side surface 14 of the lateral swinging arm 11 by the action of a spring (not shown).

The swinging width rod 15 is connected at one end to a link 17 that is rotated by operating a swinging width adjustment operation section (not shown) provided outside the machine frame, and at the other end, a needle is fixed to the lower end. Needle bar support (of the needle bar mechanism) that cooperates with the fabric feeding mechanism to form various stitches on the fabric through relative changes.
(both not shown).

The transverse axis 8 of the arm member 6.1 is engaged in a slot 21 of a cam follower release link 20 which is connected to a drive rod 19 of an electric drive 181, for example an electromagnetic solenoid.

Therefore, the horizontal shaft 8 is rotated by the electric drive device 18 around the shaft 4 parallel to the horizontal shaft 8, and the output take-out member 2 is set to either output output or non-output output to the sewing pattern memory 1. Maintain this position.

A reversible motor 22, such as a servo motor, is operatively connected to the output extraction member 2 as a driving device capable of driving the member in a reversible direction.

That is, the movable body 25, which inserts the pin 23 into the groove 9 of the boss of the cam follower 2 and fits the fork 24 for rotation prevention onto the shaft 4, is parallel to the shaft 4 that supports the follower 2. and is fitted onto a rotatable drive shaft 26 , the shaft 26
In the spiral groove 27 formed on the outer periphery of the movable body 2
Since a protruding pin (not shown) is engaged inside the drive shaft 26, the movable body 25 is caused to slide in the axial direction by the rotation of the drive shaft 26. A worm wheel 29 that meshes with a fixed worm 28 is fixed to the rotating shaft of 22.

The position sensor 30 of the output take-out member 2 is arranged to be mechanically connected to the reversible motor 22, and in the embodiments shown in FIGS. (not shown), and the rotary part is fixed to the drive shaft 26, and in FIG. The contact piece 32 protruding from the rotary potentiometer 35 is shown to be in sliding contact with the rotary potentiometer 35, and FIG. In this embodiment, the cam 36 of the rotating shaft 34 of the potentiometer 35 is fixed, and the groove 9 of the boss portion of the follower 2 is attached to the end of the rotating arm 37 that is interlocked by the rotation of the cam. A pin 38 to be fitted is fixed.

In the embodiment shown in FIG. 4, a groove 39 is provided in the movable body 25 in order to ensure more accurate positioning of the cam follower 2 or the movable body 25.
A pin 40 fixed to the cam follower 3 is fitted into the groove, and a toothed bar 41 forming a plurality of teeth into which the pin 40 is fitted is rotatably mounted on the drive shaft 26 in the axial direction. The pin 42 is supported so as to prevent movement thereof, and a pin 42 protruding from an appropriate position is engaged with the release link 20 to receive the action of the electromagnetic solenoid 18.

In addition, as another embodiment for making the position setting of the cam follower 2 more accurate, as shown in FIG. It is also possible to consider an equivalent device in which the pin is provided and fitted into the window 45 of the position correction plate 44 fixed to the mechanism base.

In addition to the above-mentioned mechanism, as shown in Figure 6, an operating section 51 for selecting a sewing pattern is provided at an appropriate position that can be operated from outside the arm bed machine frame of the sewing machine. Different voltages are supplied for each.

The output from the selection switch is converted by a digital-to-analog converter 52, and this analog output is further transferred to a position sensor, such as a potentiometer 30, for position detection.
It is connected to a power amplifier 53 in order to compare with the feedback voltage from the current position from 3L35, and a reference voltage from the pattern switch 51 and a potentiometer or variable resistor 30, 31, 35 driven by the motor 22 are connected. The motor is connected so that the motor is driven until the potential difference becomes O by comparing the feedback voltage with the feedback voltage of the cam follower. It is connected to operate the solenoid 18.

To explain the electric circuit in more detail with reference to FIG. 7, one end of the pattern switches SW1 to SW4 is grounded, and the other end is connected to the input terminals D1 to D4 of the latch circuit.

Resistors R1 to R4 are for pull-up. When one of the pattern selection switches SW1 to SW4 is selected, one of the inputs of the NAND circuit NAND1 becomes low L (OV), so the output becomes high H (5V).

Since the output of NANDl is connected to the trigger terminal B of the monostable circuit MM, the output of NANDl changes from low to high H.
It is triggered when the quotient changes to , and the output Q becomes the quotient H for a certain period of time.

Since the Q of the monostable circuit MM is connected to the latch signal input Cp of the latch circuit, when Cp is large and the input is high, the signals of the input terminals D1 to D4 are latched, and the outputs Q1 to Q4 are
is output to.

NAND2 and NAND3 are the outputs Q1 to Q4 of the latch circuit
used for encoding purposes.

The relationship between each pattern selection switch is shown below.

Outputs Q1 to Q4 from the latch circuit have voltage limiting resistors R
5 to R8 to the light emitting diodes LED1 to LED4.

The outputs of NAND2 and NAND3 are digital-to-analog converted by an operational amplifier OP1 having a ladder network composed of R9-R12.

Furthermore, this analog output is connected to the next stage power amplifier OP2.53 in order to be compared with the voltage depending on the position from the variable resistor VR for position detection.

R14 and R13 are feedback resistors.

That is, the pattern selection switch 51 generates a reference voltage and the variable resistor VR (
30, 31, and 35), the motor is driven so that the voltage difference becomes 0.

The drive circuit 54 of the release solenoid 5-Rl8 drives Trl and Tr2 via the resistor R207R22 connected to the power amplifier OP2.53.

That is, when the power amplifier OP2.53 outputs a positive voltage, Trl is forward biased and turned on, and Tr2 is reverse biased and turned off.

Since Tr3 is connected to Trl via R25, T
If rl is on, it is on, and if it is off, it is off, so T
r3 turns on, turning on Tr4 via R27.

Therefore, the release solenoid 5-Rl8 is driven by 1.

If the output of power amplifier OP2.53 is a negative voltage, Tr,
is reverse biased and Tr2 is sequentially biased, Tr2
is turned on, turning on Tr4 via R26, and driving the release solenoid 5-Rl8 by 1.

That is, when a positive or negative voltage is applied to the power amplifier OP2.53, the solenoid 18 is applied.

Trl 7Tr2 are both turned off when the voltage divided by R207R21 or R22y R23 is lower than each VDE.

Since the present invention has the above-mentioned configuration, when a sewing pattern is selected by operating the pattern selection switch 51, a different reference voltage is supplied for each sewing pattern, and the solenoid 18 is first driven by 1 and the mechanical memory 1 is read. The output member 2 is separated and the reversible motor 22 is then driven.

The reversible motor includes a worm 28 and a worm wheel 2.
9, the movable body 25 is slid on the drive shaft 26, or directly (FIG. 3) the output take-off member 2 is selectively moved relative to the mechanical memory and stopped together.

The output take-out member 2, ie, the cam follower, receives voltage feedback from the position sensor 30, ie, the potentiometer, regarding the current position of the movable body, and continues to move until the voltage difference from the reference voltage becomes 0, thereby creating the desired sewing pattern. It can be stopped accurately at the position.

As described above, the present invention allows the sewing machine operator to simply lightly touch the sewing pattern selection operation section to release the follower from the cam, then slide and stop at a position opposite the desired cam, and then cam again. Since the entire process involved in the process is performed dynamically, the operation is extremely simple, and the process from operation to setting can be completed in a short period of time, which has great practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a main part, FIG. 2 is a perspective view of a main part of another embodiment, and FIG. 3 is a perspective view of a main part of another embodiment. FIG. 4 is a perspective view of a main part of still another embodiment, FIG. 5 is a perspective view of a small main part of still another embodiment, FIG. 6 is a block diagram of the present invention, and FIG. 7 is an electric circuit of the present invention. It is a diagram. In the figure, 1 is a mechanical sewing pattern memory, 2 is an output take-out member, 18 is an electric drive device, 22 is a reversible motor, 30.
31 and 35 are position sensors, and 51 is a selection operation section.

Claims (1)

[Claims] 1. A stitch forming device that is driven in synchronization with the rotation of the main shaft of the sewing machine and forms a stitch pattern by relatively changing the needle and cloth feed, and a mechanical stitch that is interlocked in synchronization with the rotation of the main shaft. a pattern memory, an output take-out member that is supported so as to be able to reciprocate into and out of the memory and outputs sewing pattern information written in the memory by engagement and transmits it to the stitch forming device; a selection operation section that can selectively operate the output member to engage the memory; a position sensor that detects the position of the movable body with respect to the memory and generates a feedback voltage; and a feedback voltage generated by the selection operation of the selection operation section. a comparator that compares a reference voltage received from the position sensor with a feedback voltage from the position sensor and supplies one drive voltage to the reversible motor; a reversible motor that moves the output take-out member when there is a voltage of A sewing pattern selection device for a sewing machine.