JPS6030231B2 - Pattern cam selection device in zigzag sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern cam selection device for a zigzag sewing machine, and more particularly, to a pattern cam selection device for a zigzag sewing machine, and more particularly to a pattern cam selection device for oscillating a sewing needle in a horizontal direction in conjunction with a sewing machine main shaft rotatably supported on a sewing machine frame. It has a plurality of pattern cams that are rotationally driven in conjunction with the main shaft of the sewing machine, and the cam follower engages with a cam corresponding to a desired stitch pattern among the pattern cams by the operation of a cam selection actuating device; A pattern cam selection device for a so-called cam built-in zigzag sewing machine that can form a desired stitch pattern by imparting a predetermined lateral oscillating movement to the sewing needle by driving a sewing machine motor that is operatively connected to the main shaft of the sewing machine. Regarding.

In a conventional pattern cam selection device of this type, a rotatable manual operation body is installed outside the sewing machine frame, and when the manual operation body is rotated for pattern selection, the rotation A lift cam and a selection cam are provided which rotate in conjunction with the manual operation, and the cams and the cam follower are operatively connected so that when the manual operation member is rotated, the tilt cam of the lift cam is first rotated. The action of the surface causes the cam following means to disengage from the previously engaged pattern cam, and then the action of the inclined cam surface of the selection cam causes the disengaged cam follower to move into a pattern corresponding to a predetermined stitch pattern. Manual selection of the pattern cam is performed by a series of operations of moving the lift cam to a position facing the cam, then releasing the action of the lift cam, and engaging the cam follower with the pattern cam that was facing the cam follower. was.

However, as the number of stitch patterns to be selected increases, the slopes of the inclined cam surfaces of the IJ foot cam and selection cam become steeper, so manual operation is required when rotating both cams to select a pattern cam. There is a problem in that the rotating operation of the body becomes extremely heavy, making it impossible to perform pattern selection operations smoothly, and conversely, in order to ensure smooth pattern selection operations, it is necessary to limit the number of stitch patterns. was occurring.

Therefore, the present invention has been made in view of the above problems, and its purpose is to operate a manual switch for pattern selection, for example, by pressing, instead of rotating the manual operation member in the conventional pattern cam selection device. To provide a pattern cam selection device that automatically selects a pattern cam only by operation.

Embodiments embodying the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a sewing machine main shaft 1 is rotatably supported on a frame 2 of the sewing machine shown in FIG. There is.

A plurality of pattern cams 5 for imparting lateral oscillating motion to the sewing needle 4 and a plurality of feed control cams 7 for controlling the feed movement of the feed dog 6 are connected to the cam shaft 3 together with the gear 8. The main shaft 1' is integrally supported in a bush, and is driven to rotate at a reduced speed in conjunction with the main shaft 1 by meshing the gear 9 and the gear 8 fixed to the main shaft 1'. A fixed shaft 1 is fixed to the pattern cam 2 in parallel with the cam shaft 3, and first and second swing frames 11 and 12 each having a planar U-shape are swingable on the fixed shaft 10. It is inserted into the shaft and is mounted so as not to move in the axial direction. first and second cam followers 13,
14, the base end of the fixed shaft 10' is inserted so as to be located inside the first and second swing frames 11 and 12, respectively, and the swing frame 11 is inserted in parallel with the fixed shaft 10. , 12, the free ends of which are also inserted into the first and second connecting shafts 15, 16, which swing integrally with the swinging frames 11, 12, respectively, and whose fixed shafts 10 in the direction of the koji within these frames, and selectively engages with any one of the pattern cams 5 and the feed control cam 7 by the action of a cam selection actuating device to be described later. obtain. The first swing frame 11 is operatively connected to a known swing link frame 8 via a lotus 17.
The needle support frame 19 has a contact head 19a that engages with the engagement surface 18a of the swing link 18, and is attached to a needle support frame (not shown) that supports the needle bar 4a to which the sewing needle 4 is attached. The first cam follower 13 is connected to transmit the swinging motion of the first cam follower 13 to the needle bar 4a and the sewing needle 4.

The first swing frame 11 has a needle support frame and a sewing machine frame 2.
The first cam follower 13 is always moved to the pattern cam 5 by receiving rotational force in the direction of the arrow A shown in FIG. Pressure contact. Further, the second swing frame 12 has an extension portion 12a thereof.
is connected to a feed adjustment rod (not shown) via a connection means such as a feed control lever, and the arrow B shown in FIG.
The second cam follower 14 is always urged in a direction in which the second cam follower 14 is brought into pressure contact with the feed control cam 7. Next, the cam selection actuating device will be explained. A lift lever 20 and a lift cam 21 are provided to separate the first and second cam followers 13 and 14 from the pattern cam 6 and the feed control cam 7. The base end of the lift lever 2 is rotatably attached to the sewing machine frame 2 by a fixing screw 22, and a contact pin 23 is provided at its free end, and the contact pin 23 is connected to the cam surface of the lift cam 21. arranged to engage.

Further, the lift lever 20 has a protruding end 20a in the middle part.
are provided, which abut the extensions 11a and 12a of the first and second swing frames 11 and 12 from below, respectively, and cooperate with the lift cam 21 to move the cam followers 13 and 14 to the cam 5. , 7. A tension spring 24 is further tensioned in the middle of the lift lever 20, and urges the lift lever 20 in the direction of arrow C shown in FIG. 2 so that the contact pin 23 comes into pressure contact with the cam surface of the lift cam 21. There is. The lift cam 21 is constituted by an eccentric cam, and is integrally supported with a gear 28 by an operating shaft 27 on which first and second selection cams 25 and 26 (to be described later) are fixed. When the cam surface 21a engages with the contact pin 23, the lift lever 20 is rotated upward against the spring force of the tension spring 24. First and second selection cams 25 and 26 are used to move the first and second cam followers 13 and 14 in the axial direction of the fixed shaft 10 to face the desired pattern cam 5 and feed control cam 7. are provided, and the base ends of the first and second moving levers 29 and 30 are supported by first and second support shafts 31 and 32, respectively, which are supported by the sewing machine frame 2. .

The first movable lever 29 has a pin 33 at its free end that engages with an annular groove 13a formed at the base end of the first cam follower 13, and has a pin 33 at its intermediate portion. A contact pin 34 is provided which engages the cam surface of the selection cam 25. On the other hand, the second moving lever 30 has an annular groove 14 formed at the base end of the second cam follower 14 at its free end.
A pin 35 is provided as a shield, and a contact head 30a that engages with the cam surface of the second selection cam 26 is protruded from the intermediate portion of the pin 35. Coiled springs 36 and 37 are stretched around the base ends of both moving levers 29 and 30, respectively, and the contact pin 34 and contact head 30a are connected to the first and second selection cams 25,
The moving levers 29 and 30 are biased so as to be pressed against the cam surfaces of 26, respectively. In order to operate the cam selection actuating device configured as described above, the sewing machine motor 3
8 is applied to the lift cam 21 and both selection cams 25,
The transmission mechanism for transmitting data to 26 will be described below.

Two pulleys 40 are attached to the output shaft 39 of the sewing machine motor 38.
a and 40b are fixed, and one of the f.

- A transmission belt 42 is installed between the IJ 40a and a main shaft pulley 41 inserted into the main shaft 1 of the sewing machine, and when the sewing machine motor 38 rotates forward, the main shaft pulley 41 transmits a rotational force in the direction of arrow P shown in FIG. Take it and rotate. A handwheel 43 fixed to the sewing machine main shaft 1 and the main shaft pulley 4
A spring clutch 44 is provided between the end 44 and the
a is fixed to a handwheel 43, and the rotational force of the main shaft pulley 41 in the direction of arrow D shown in FIG. 2 is transmitted to the handwheel 43 via a spring clutch 44. Further, the other end 44b of the spring clutch 44 is arranged so as to be able to engage and separate from an actuating plate 46 which is attracted and operated by a first electromagnetic solenoid 45, and the actuating plate 46 is normally operated by the action of a tension spring 47 to engage and separate from the other end 44b. is separated from. The other pulley 40b fixed to the output shaft 39 of the sewing machine motor 38 is a pulley 49 fixed to the drive shaft 78.
and is connected by a transmission belt 50. The drive shaft 4
8 is further fitted with a drive gear 51 and a drive pulley 52, and the drive gear 51 meshes with the gear 28 via an intermediate gear 53a to move the lift cam 21 toward the operating shaft 2.
7, and its drive pulley 52
The gear 56 is connected by a transmission belt 55 to a pulley 54, which is fixedly inserted into the intermediate shaft 53b, and rotates a gear 56, which is fixedly inserted into the intermediate shaft 53b. The gear 56 meshes with a gear 57 that is fixed to the operating shaft 27 integrally with the selection cams 25 and 26, and the selection cams 25 and 2
6 is rotated together with the operating ratchet 27. The spring clutch 58 is provided between the drive gear 51 and the drive shaft 48, one end 58a of which is fixed to the drive gear 51, and drives the rotational force of the pulley 49 in the direction of arrow E shown in FIG. gear 51
The other end 5 of the spring clutch 58
8b is disposed so as to be able to engage and separate from an actuating plate 60 which is attracted and actuated by the second electromagnetic solenoid 59, and the actuating plate 6 is engaged with the other end 58b by the action of a tension spring 61. The rotational force of the pulley 49 is applied to the drive gear 5
It acts to prevent transmission to 1. Further, the spring clutch 62 is provided between the drive pulley 52 and the drive shaft 48, and similarly to the spring clutch 58, one end thereof is fixed to the drive pulley 52, and the rotational force of the pulley 49 in the direction of arrow E is applied to the spring clutch 62. The other end 62b is arranged so as to be able to engage with and separate from an actuating plate 64 that is suction operated by a third electromagnetic solenoid 63, and the actuating plate 64 is normally operated by the action of a tension spring 65. It is engaged with the other end 62b of the spring clutch 62 and acts so that the rotational force of the pulley 49 is not transmitted to the drive pulley 52. In this embodiment, the electromagnetic operating device includes a sewing machine motor 38, second and third electromagnetic solenoids 59,
63. The structure of an electric circuit for controlling the operation of the cam selection actuating device and the transmission machine having the above-mentioned mechanical structure will be explained below with reference to FIGS. 3 and 4.

A first thyristor 66 is connected in series with the field winding 38a and armature 36b of the sewing machine motor 38 to drive the sewing machine motor 38 in the forward rotation direction, and the series circuit is connected to the first thyristor 66.
and second busbars 67 and 68.

The first bus 67 is the first bus of a first relay 69, which will be described later.
Contact a of the operation switch 69a and the power switch 70a
The second bus bar 68 is directly connected to the AC power source 71 via the AC power source 71 . The power switch 70a is configured as a holding type push switch, and is closed by pressing a haze source button 70b that is linked to the switch 70a. A second activation switch 69b of the first relay 69 is connected in parallel to the series circuit of the field winding 38a and the armature 38b. Both bus lines 67, 68
A diode 72 and a series circuit of four resistors 73 to 76 are connected between them, and a capacitor 77 is connected in parallel to the series circuit of resistors 74 to 76. Resistors 73 and 7
A high-speed setting switch 79a is connected between the connection point CI of No. 4 and the first auxiliary bus 78, and the resistor 74 and the first auxiliary bus 78 are connected to each other. A medium speed setting switch 80a is connected between the connection point C2 of the resistors 75 and 76 and the first auxiliary bus 78, and a low speed setting switch 81a is connected between the connection point C3 of the resistors 75 and 76 and the first auxiliary bus 78.
is connected, and its three speed setting switches 79a
81a to 81a are configured as holding type push switches, and are closed in conjunction with the pressing operation of speed setting nails 79b to 81b arranged at the lower right side of the machine frame 2 of the sewing machine shown in FIG. These speed setting buttons 79b to 81b correspond to high speed, medium speed, and low speed, respectively. The power supply metal rod 70b is arranged adjacent to the high speed setting button 79b. The gate of the first thyristor 66 is connected to the second thyristor which will be described later.
Activation switch 82a of relay 82 and diode 83
A noise prevention capacitor 84 is connected between the gate and cathode of the thyristor 66, and the speed setting switch 79a
By selectively closing the resistors 73 to 81a, the divided voltage of the voltage dividing circuit made up of the four resistors 73 to 76 changes to the voltage value corresponding to the closed speed setting switch of the first thyristor 66. Applied to the gate. A second thyristor 85 is provided for driving the sewing machine motor 38 in reverse rotation, and its anode is connected to the second bus bar 68' via the armature 38b, and its cathode is connected to the second auxiliary bus bar 88'.
6.

A diode 87, a parallel circuit of a capacitor 88 and a resistor 89a, and an adjustment resistor 89b are connected in series between the second auxiliary bus bar 86 and the second bus bar 68, and a PNP type transistor 9 and a regulator capacitor 88 are connected in series. The base is connected to the connection point with the resistor 89a, and the collector is connected to the gate of the second thyristor 85. The armature 38
A sliding resistor 91 is connected in parallel with b, and the sliding resistor 91
The emitter of the transistor 90 is connected via a diode 93 to a sliding scale terminal 92 of the transistor 90, and the gate of the transistor 85 is connected to the emitter of the transistor 90 via a diode 93. A noise prevention capacitor 94 is connected between the cathodes. The second auxiliary bus bar 86 is connected to the contact b of the first operating switch 69a, and by switching between the contact a and the contact b of the operating switch 69a, the sewing machine motor 38 is driven in forward rotation and reverse rotation. Either one is selected. A first detector 95 is provided to detect the rotational position of the lift cam 21 which is rotated by the reverse rotational force of the sewing machine motor 38, and the detector 95 is integrated with the lift cam 21 as shown in FIG. a contact arm 96 that rotates around the operating shaft 27; a support plate 97 disposed opposite the contact arm 96 and fixed to the sewing machine frame 2; and a slip ring attached to the support plate 97. 98 and "two contact pieces 99a and 99b attached to the support plate g7 and arranged oppositely on the same circle as the slip ring 98, and two contacts attached to the free end of the contact arm 96. The contact piece 101 is arranged on the contact arm 96 so as to be able to come into contact with the contact pieces 99a and 99b. As shown in FIG. 3, the slip ring 98 is connected to the drop potential terminal, and the two contact pieces 99a and 99b are connected to the high potential terminal via resistors 102 and i03, respectively. A second detector 104 is provided as shown in FIG. 2 in order to detect the rotational positions of the first and second selection cams 25 and 26 which are rotated by the transmission of the reverse rotational force of the rotation force of the rotation force 38. The contact arm 104 is inserted into and fixed to the operating shaft 27 and rotates together with both selection cams.
5, a support plate 106 disposed opposite the contact arm 105 and fixed to the sewing machine frame 2, and the support plate 106
a slip ring 107 attached to the support plate 106, and a large number of contact pieces 201, 20 attached to the support plate 106 and arranged concentrically with the slip ring 107 at equal intervals.
2,...212, and two contacts 108 and 109 attached to the free end of the contact arm 105, and the contact 108 has a plurality of contact pieces 201 to 212. disposed on the contact arm 105 so as to be able to contact each of 212,
The contactor 109 is arranged on the contact arm 105 so as to be able to come into contact with the slip ring 107 . The plurality of contact pieces 2
01 to 212 each correspond to a predetermined number of types, for example, 12 types of stitch patterns, and 12 pieces are arranged on the front side of the sewing machine frame 2 corresponding to the 12 types of stitch patterns. The slip ring 107 is connected to the zero potential terminal. The anodes of these light emitting diodes LEDI to LED12 are commonly connected and connected to a high potential terminal via a resistor 110. In order to select a desired stitch pattern from among the 12 types of stitch patterns, 12 manual switches SWI to SW2 are provided for the stitch patterns, and as shown in FIG. ~In support of LED12, Part 1
They are respectively arranged below the figures SBI to SB12 representing the stitch patterns of two lotuses, and are configured as return type push switches.

One contact a of the 12 manual switches SWI to SW12 is connected in common and connected to the bottom potential terminal, and the other contact b is connected to each input terminal of the multi-input NAND circuit 111 and resistors 112 to 123. connected to the high potential terminal via. The code signal generator 124 generates a code signal corresponding to the stitch pattern selected by selectively pressing the 12 manual switches SI to SW12 (shown as a manual switch group 125 in FIG. 3). electrical signals SCI to SC12 generated from contact b connected to the high potential terminal of each manual switch.
However, the code and -code signals are constructed. Further, the electrical signals SCI to SC12 are applied to the logic circuits LGI to LG.
12 respectively. Those logic circuits LG
The configurations of each of I to LG12 are almost the same, so to explain the configuration using the logic circuit LGI as an example, the electrical signal SCI generated from the code signal generator 124 is input to the monostable multipipe layer 126. The normal output terminal (indicated by the number "1" in FIG. 4) of the monostable multivibrator 26 is connected to one input terminal of the AND circuit 127a. The other input terminal is the light emitting diode LE.
A line LI connecting the anode of DI and the contact piece 201
The output terminal of the AND circuit 127a is S-
Set input terminal S of B-type flip-flop circuit 128
It is connected to the. The inverting input circuit (indicated by a circle in FIG.
The normal rotation output terminal 9 is connected to one input terminal of the OR circuit 127b. The other input terminal of the OR circuit 127b is connected to the output terminal of the multi-input NAND circuit 111 via line L13, and its output terminal is connected to the reset terminal R of the flip-flop circuit 128. Although the logic circuit LGI is configured as described above, the configuration of the remaining logic circuits LG2 to LG12 is that of the logic circuit LGI.
The difference from that of GI is that the negative input circuit of the monostable multivibrator 29 is not commonly connected to the line LI, but is connected to the line L2 which connects the anodes of the light emitting diodes LED2 to LED12 and the contact pieces 202 to 212. to L12, respectively.

The monostable multipipe layer 126 in the logic circuit is triggered when a signal rising from a low level to a high level is supplied to its input terminal, and generates a high-level pulse signal at its normal output terminal. The monostable multivibrator 129 is triggered when a signal falling from a high level to a low level is supplied to its negative input circuit, and generates a high level pulse signal at its normal output terminal.

The flip-flop circuit 128 enters the set state when a high level signal is supplied to its set terminal S, and generates a high level signal at its normal output terminal (indicated by the number "1" in FIG. 4). When a high level signal is supplied to the reset terminal R, it enters the reset state, generates a low level signal at its normal output terminal, and is forced to enter the reset state when the power switch 70a is closed. The normal output terminals of the flip-flop circuits 128 in the logic circuits LGI to LO12 are connected to each input terminal of a multi-input OR circuit 130.

The trigger flip-flop circuit 131 has its negative input terminal T connected to a high potential terminal via a resistor 132, and also to a contact B of a start/stop switch 133a of the sewing machine motor 38. The start/stop switch 13
The contact point a of 3a is immediately connected to the cloud level terminal, and the start/stop switch 133a is configured as a return type push switch, and is connected to the start/stop switch 133a, which is located on the left front side of the machine frame 2 of the sewing machine shown in FIG. It is closed by the pressing operation of 0133b. Each time the start/stop button 0133b is pressed, the flip-flop circuit 131 generates an alternately inverted signal SPI at its normal output terminal. The normal output terminal of the multivibrator 35 is connected to the negative input circuit of the monostable multipipulator 135 via the line L14, and the normal output terminal of the multivibrator 35 is connected to the S-R type flip-flop circuit 136. is connected to the set terminal S of. The monostable multivibrator 137 has a negative input circuit connected to the first detector 95.
is connected to the contact piece 99a of the flip-flop circuit 136 via the line L15, and its inverting output terminal (indicated by the number "0" in FIG. 4) is connected to the negative reset terminal (marked with a circle in FIG. 4) of the flip-flop circuit 136. The normal output terminal of the flip-flop circuit 136 is connected to one input terminal of an OR circuit 138. The other input terminal of the OR circuit 138 is the line L.
14, and its output terminal is connected to the clear terminal CL of the flip-flop circuit 131. The monostable multivibrator 39a has its input terminal connected to the line L14, its normal output terminal connected to the negative input circuit of the monostable multivibrator 39b, and the normal output terminal of the multivibrator 39b connected to the OR circuit 140. Connected to one input terminal. The monostable multipipulator 141 has its negative input terminal connected to the line L14, and its normal output terminal connected to the OR circuit 1.
40 is connected to the other input terminal. The monostable multipipulator 142 has an input terminal connected to the line L14.
The monostable multivibrator 44 has its negative input circuit connected to the normal output terminal of the flip-flop circuit 136 through the line L16.
The normal rotation output terminal thereof is connected to the negative input circuit of the monostable multivibrator 145. S
-R type flip-flop circuit 146 has its set terminal S connected to the non-inverting output terminal of the monostable multipipelator 143, and its negative reset terminal R connected to the inverting output terminal of the monostable multipipelator 145. There is. The monostable multipipe layer 47 has a negative input circuit connected to the contact piece 99M of the first detector 95 and the line L1.
7, and its normal output terminal is connected to the set terminal S of the S-R type flip-flop circuit 148. A negative reset terminal R of the flip-flop circuit 148 is connected to the line L14. The monostable multipipelators 134, 139a and 142 operate in the same manner as the monostable multipipelator 126,
When a signal rising from a low level to a high level is supplied to its input terminal, it is triggered and generates a high-level pulse signal at its normal output terminal.

The monostable multivibrator 135, 137, 139
b, 141, 143, 144, 145, and 147 operate in the same manner as the monostable multipipulator 129, and are triggered when a falling signal from a high level to a low level is supplied to their negative input circuits, and their positive outputs occur. It generates a high-level pulse signal at the power terminal. In addition, the S-R
Type flip-flop circuits 136, 146, and 148 are similar to the flip-flop circuit 128 described above and connected to the power switch 7.
When the power switch 70a is closed, the trigger flip-flop circuit 131 is forced into a reset state and outputs a low level signal to its normal output terminal, and the trigger flip-flop circuit 131 is also forced into a clear state when the power switch 70a is closed. and is configured to output a low level signal to its normal rotation output terminal. The electrical circuit shown in FIG. 4 consists of manual switches SWI to S.
The discrimination device 149 is shown in FIG. 3 except for the manual switch group 125 consisting of W12, the code signal generator 124, and the start/stop switch 133a.

Subsequently, the output signal S output from the discrimination device 149
The control device that operates in response to PI through SP5 will be described below. The trigger flip-flop circuit 13
A line L18 is connected to the normal rotation output terminal of the NPN transistor 1501, and the base of an NPN transistor 1501 is connected to the line L18 via a resistor 151, and its collector is connected to the excitation coil 82c of the second relay 82 and the freewheel. It is connected to a high potential terminal via a parallel circuit with a diode 152, and its emitter is connected to the base via a resistor 153 and directly to the zero potential terminal. NP
An N-type transistor 154 has a base connected to a line L connected to the non-inverting output terminal of the flip-flop circuit 136.
16 via a resistor 155, its collector is connected to a high potential terminal via a parallel circuit of the excitation coil 69c of the first relay 69 and a freewheeling diode 156, and its emitter is connected via a resistor 157. It is connected to the base and directly to the terminal. The base of the NPN transistor 58 is connected to the output terminal of the OR circuit 140 via a resistor 159 by a line LI9, and the collector thereof is connected to the second electromagnetic solenoid 89.
excitation coil 59c and freewheel diode 160
The emitter is connected to the base via a resistor 161 and directly to the drop potential terminal. The base of the NPN transistor 162 is connected to the normal output terminal of the flip-flop circuit 146 through a line L201 via a resistor 163, and the collector thereof is connected to the excitation coil 45c of the first electromagnetic solenoid 45 and the freewheel diode 164. The emitter is connected to the base via a resistor 165, and directly connected to the zero potential terminal. The base of the NPN transistor 166 is connected to the normal output terminal of the flip-flop circuit 148 via the resistor 167 on the line L2.
1, its collector is connected to a high potential terminal via a parallel circuit of the excitation coil 63c of the third electromagnetic solenoid 63 and the freewheel diode 168, and its emitter is connected to the base via a resistor 169. and is directly connected to the zero potential terminal. The operation of the embodiment of the present invention having the above configuration will be described below.

First, press the Kasumigen button 70b to turn on the power switch 70a.
as shown by the dotted line in Figure 3, and then press the start/stop button 1.
33b to close the start/stop switch 133a, the negative input circuit T of the flip-flop circuit 131
The flip-flop circuit 131, which is cleared when the power switch 70a is opened, is triggered by the falling edge of LP5 and generates a high-level signal SPI at the normal output terminal. .

The high level signal SPI is applied through line L1 8 to the base of transistor 150, turning on that transistor 1501 and turning on the excitation coil 8 of second relay 82.
2c, and the activation switch 8 of the second relay 82 is activated.
2a is opened as shown by the dotted line in FIG. On the other hand, the flip-flop circuit 136 is connected to the power switch 70 described above.
a is in the set state by closing, and generates a low level signal SP2 at its normal output terminal, and the low level signal SP2 is generated at its normal output terminal.
Since the transistor 154 to which P2 is applied is in the off state and demagnetizes the excitation coil 69c of the first relay 69, the first and second operating switches 6 of the relay 69 are turned off.
9a and 69b are in the state shown in FIG. That is, the first actuation switch 69a is switched to contact a, and the second actuation switch 69b is opened. When both the relays 69 and 82 are operating as described above, the AC voltage from the AC power supply 71 is applied to the resistors 73 to 76 via the diode 72.
A divided voltage divided by these resistors is applied to the diode 83 and the operating switch 82a in the closed state.
is applied to the gate of thyristor 66 via. As shown in FIG. 1, when the high-speed setting switch 79a is closed by pressing the high-speed setting metal 079b, a relatively high voltage from the connection point CI is applied to the gate of the thyristor 66. The conduction angle of the thyristor 66 becomes large, and the sewing machine motor 38 is started by being supplied with a relatively large amount of electric power, and then the sewing machine motor 38 is operated at a predetermined high speed. At this time, the field winding 38a and the armature 38b of the sewing machine motor 38 are connected in series, and the sewing machine motor 38 is operated as a series motor and can generate a large starting torque.
And the armature 38b has a first bus bar 67 to a second bus bar 6.
81 The rectified current is supplied to the sewing machine motor 3.
8 is driven in forward rotation. This positive rotational force of the sewing machine motor 38 is transmitted to the main shaft pulley 41 via the pulley 40a and the transmission belt 42. Since a low level signal SP4 is generated at the normal output terminal of the flip-flop circuit 46 which is in the reset state by closing the power switch 70a, the transistor 162 is turned off and the excitation coil of the first electromagnetic solenoid 45 is turned off. 45c is demagnetized, so that the actuating plate 46 is separated from the free end 44b of the spring clutch 44 by the action of the tension spring 47, and the spring clutch 4
4 connects the main shaft pulley 41 and the handwheel 43. In this state, when the main shaft pulley 41 rotates in the direction of arrow D shown in FIG. The rotation of the main shaft 1 is transmitted to the camshaft 3 via the gears 8 and 9, and the pattern cam 5 and the feed control cam 7 are rotated. The start/stop switch 1
33a, when the operator presses the manual switch SS2 shown in FIG. 1 and selects a stitch pattern corresponding to the manual switch SW2, for example, a three-point zigzag stitch pattern, the three-point zigzag stitch pattern is selected. a pattern cam and a feed control cam suitable for forming a pattern, and first and second cam followers 13;
14 are engaged with each other, as the camshaft 3 rotates as described above, both cam followers operate according to the cam surfaces of both cams, imparting a lateral rocking motion to the sewing needle 4, and The feed dog 6 is caused to perform a feed motion. The operation of forming a pattern according to the cam surfaces of the pattern cam and the feed cam is well known and will not be described here. When the manual switch SW2 is pressed and selection of the desired cam is completed, as will be understood from the explanation below, the contact arm 105 of the second detector 104 moves to the three-point zigzag stitch selected by the manual switch SW2. Contact piece 2 corresponding to the pattern
02 and the contactor 108 are positioned as shown in FIG. 3 in an engaged state and held at that position.

Since the contact 108 is always connected to the slip ring 107 via the contact 109, the contact piece 202
The electric potential of the contact piece 202 is changed to the zero electric potential of the slip ring 107 by engagement with the contact piece 202, and the light emitting diode LED2 whose cathode is connected to the contact piece 202 is continuously lit. SB2
The shape of the three-point zigzag stitch pattern shown as is indicated. Next, when the manual switch SWI corresponding to the zigzag stitch pattern is pressed to change from the three-point zigzag stitch pattern to the zigzag stitch pattern, the code signal generator 124 is in a low level state during the press operation. electrical signal SCI in the high level state and electrical signal SC2 in the high level state.
The electrical signals SCI to SC1 are generated as code signals corresponding to the zigzag stitch pattern.
2 are individually input to the logic circuits LG to 12, respectively, and are also input to the input terminals of the multi-input NAND circuit 111.

At that time, the remaining logic circuits LG2 to LG12 excluding the logic circuit LGI operate in the same way, so to explain the logic circuit LG2 as an example, the electrical signal SC2 input to the logic circuit LG2 is in a high level state and is monostable. Since the multivibrator 26 is not triggered and its normal output terminal is in a low level state, the fund circuit 127a receiving the low level signal is closed and the flip-flop circuit 128 is turned on.
The set terminal 8' supplies a low level signal, while the output signal LPI of the multi-input NAND circuit 111 becomes high level while the manual switch SWI is pressed, and its flip-flop circuit 128 becomes the reset terminal. R receives a high-level signal LPI through the OR circuit 127b, enters a reset state, and generates a low-level signal at its normal output terminal. The remaining logic circuits LG3 to LG12 operate in the same manner to bring the non-inverting output terminal of each flip-flop circuit 128 to a low level state. The logic circuits LG2 to LG1
The output signal No. 2 remains unchanged and maintained at a low level as long as the zigzag stitch pattern is selected, that is, unless the manual switches SW2 to SW12 are pressed.

The operation of the logic circuit LGI will be explained with reference to FIG.
is the period during which the manual switch SWI is pressed (TI
~T2) It becomes a low level state and its manual switch SWI
When the pressing operation is released (time T2 shown in FIG. 5), the level rises from a low level to a high level, and the monostable multivibrator 26 is triggered in response to the rising signal and outputs a high-level pulse signal to its forward output terminal. generates AND circuit 1
27a. At that time, the detection signal P! from the second detector 104 is supplied to the other input terminal of the AND circuit 127a! In this case, the contact piece 201 is the contact 1
08, it is in a high level state as shown in FIG. 5, and the AND circuit 127a is opened upon receiving the high level detection signal PI and passes the high level pulse signal. The output signal LP2 of the AND circuit 127a temporarily becomes a high level state as shown in FIG. 5, and a high level signal is supplied to the set terminal S of the flip-flop circuit 128. On the other hand, the high level output signal LP
The monostable multivibrator 29 to which is supplied is not triggered and generates a low level output signal LP3 at its normal output terminal as shown in FIG. 5, and supplies it to one input terminal of the OR circuit 127b. When the pressing operation of the manual switch SWI is released (time T2), the large force NAND circuit 11
The first output signal LPIG falls from a high level to a low level and becomes a low level state, and the low level output signal LPI is supplied to the other input terminal of the OR circuit 127b. Therefore, the OR circuit 127b outputs its output signal LP4 at time T.
2, the flip-flop circuit 1 is brought to a low level state.
At time T2, when the low level output signal LP4 is supplied to the reset terminal R of the flip-flop circuit 128, the high level output signal LP2 is supplied to the set terminal S of the flip-flop circuit 128, and the low level output signal is supplied to the reset terminal. Since the output signal LP4 is supplied, the flip-flop circuit 128 is set to bring its normal output terminal to a high level state. As can be understood from the above explanation, after the manual switch SWI is released (after time T2), only the output signal of the logic circuit LGI changes to a high level state, and the output signal of the remaining logic circuits LG2 to LG12 changes to a high level state. All output signals are in a low level state. As a result, the output signal CP of the multi-input OR circuit 130 is output at the time T as shown in FIG.
2, it rises from a low level to a high level and is then held at a high level state. When the output signal CP of the multi-input OR circuit 130 changes to a high level, the trigger flip-flop circuit 131 receives the high level output signal CP at its clear terminal CL and is cleared, and its output signal S
PI changes to a low level as shown in FIG.

As the output signal SPI changes to a low level, the transistor 50G is turned off to demagnetize the excitation coil 82c, the operating switch 82a of the second relay 82 is opened, the gate signal to the thyristor 66 is cut off, and the sewing machine motor 38 is no longer supplied with power and its rotational speed is reduced. On the other hand, monostable multivibrators 142 and 1
Since 43 constitutes a delay circuit, it operates in response to the rise of the output signal CP at time T2, and after a certain period of time tl has elapsed, a high level is output to the normal output terminal of the monostable multi/branch controller 143. A pulse signal is generated, and the pulse signal is supplied to the set terminal S of the flip-flop circuit 146. At that time, a high level signal is supplied to the negative reset terminal R of the flip-flop circuit 146 from the inverting output terminal of the monostable multivibrator 45, so
The flip-flop circuit 146 is set when it receives a high level pulse signal from the monostable multipipulator 143, and outputs its output signal SP4 at time T shown in FIG.
3, change from low level to high level. When the high level output signal SP4 is applied to the base of transistor 162, that transistor 62 turns on and the first
The excitation coil 45c of the electromagnetic solenoid 45 is excited,
The electromagnetic solenoid 45 thereby attracts the actuating plate 46 against the spring force of the tension spring 47 and positions the actuating plate 46 so that it can engage with the free end 44b of the spring clutch 44. In order to ensure that the operating plate 46 and the free end 44b of the spring clutch 44 stop the rotation of the main shaft 1 of the sewing machine, the rotational speed of the sewing machine motor 38 must be reduced to a low speed suitable for stopping the main shaft 1 of the sewing machine. Must be. Therefore, the deceleration period of the sewing machine motor 38 from when the power supply to the sewing machine motor 38 is cut off until the actuating plate 46 is sucked is the delay time tl of the delay circuit.
(Period (T2-T3)). Also,
One end 44a of the spring clutch 44 is positioned and fixed to the handwheel 43 so that when the free mechanism 44b of the spring clutch 44 engages with the actuating plate 46, the sewing needle 4 stops at the needle upper layer above the sewing machine bed surface. ing. Furthermore,
The rising edge of the output signal CP of the multi-input OR circuit 130 is supplied to a delay circuit consisting of monostable multipipulators 134 and 135, and the delay circuit responds to the rising edge and waits for a certain period of time (as shown in FIG. 6). At time T4), a high-level pulse signal is generated at the normal output terminal of the monostable multivibrator 35 and supplied to the set terminal S of the flip-flop circuit 136. At that time, the first detector 95 detects that the first and second cam followers 13 and 14 are engaged with the pattern cam 5 and the feed control cam 7, as shown in FIGS. 2 and 3. Since the contact piece 99a is brought into contact with the contact piece 100' as shown in FIG. It is in a low level state at time T4 shown in FIG. Therefore, the monostable multipipulator 137 to which the low level output signal RP2 is supplied is not triggered, and the flip-flop circuit 136 has its negative reset terminal R in the high level state, so that the output signal from the monostable multivibrator 35 is not triggered. It is set when a high level signal is received and its output signal SP2
is changed from a low level to a high level at time T4. The high level output signal SP2 is applied to the base of transistor 54 via line L16 to turn on that transistor 154, thereby turning on excitation coil 69c.
is energized and the first actuation switch 69 of the first relay 69 is activated.
a as shown by the dotted line in FIG. 3, and the second operating switch 69b is opened as shown by the dotted line. Therefore, when the first relay 69 operates, the sewing machine motor 38
The delay time t2 of the delay circuit is set so that the motor is completely stopped. When both operation switches 69a and 69b of the first relay 69 operate as described above, the sewing machine motor 38 is used as a shunt motor with its field winding 38a and armature 38b connected in parallel, and the sewing machine motor 38 is connected to the AC power supply 71 in series with the thyristor 85.

After the double actuation switches 69a, 69b are activated, the capacitor 88 begins to be charged via the diode 87, causing the base potential of the transistor 90 to drop below the potential of the second bus 68 with a constant time constant. The transistor 90
Since the sewing machine motor 38 is in a stopped state, the emitter potential of the transistor 9 is approximately at the potential of the second bus 98, and its base potential decreases as the capacitor 88 is charged.
The emitter and base of Kawamasa are forward biased and turned on, and a gate signal is supplied from the collector to the thyristor 85, causing the thyristor 85 to fire. The ignition of this thyristor 85 causes the field winding 38a and the armature 38 to
b parallel circuit from the second bus 68 to the second auxiliary bus 86
A current is supplied in the direction of , and the sewing machine motor 38 begins to rotate in the opposite direction to the direction of rotation when forming the stitch pattern. When the sewing machine motor 38 rotates in the opposite direction and its rotational speed increases to the low speed set by the adjusting resistor 89b, the delay circuit consisting of the monostable multivibrators 39a and 139b is activated.
The delay time t3 is set so as to generate a high-level pulse signal at the normal rotation output terminal of the motor. The delay circuit responds to the rise of the output signal CP from the multi-input OR circuit 130, and after a delay time t has passed (time UT shown in FIG. 6).
5) generates the high level pulse signal and outputs the OR circuit 1.
The output signal SP3 of the OR circuit 14 is temporarily brought to a high level state as shown in FIG. 6, and applied to the base of the transistor 58, and the transistor 158 output signal SP3
In response to this, it is temporarily turned on and excites the excitation coil 59c. The excitation of the excitation coil 59c causes the second electromagnetic solenoid 59 to attract and operate the actuating plate 60 against the spring force of the tension spring 61, thereby temporarily separating it from the free end 58b of the spring clutch 58. After that, the excitation coil 5
In order for 9c to become depleted, actuating plate 6 and tension spring 61
Due to this temporary separation operation of the actuating plate 60, which returns to a state in which it can engage with its free end 58b, the driving gear 51 is rotated in the direction of arrow E shown in FIG. 2 by the reverse rotational force of the sewing machine motor 38. The rotation of the pulley 49 that is
and the gear 51 is transmitted through the clutch 58.
Rotation causes the free end 58b of the spring clutch 58' to re-engage the actuating plate 60 so that no rotational force is transmitted to its gear 51. While the driving gear 51 rotates once and stops, the gear 28 to which the rotational force is transmitted from the gear 51 is decelerated by the intermediate gear 53 so that it rotates half a rotation, and rotates together with the gear 28. lift cam 2
1 is rotated to an angular position where the cam surface 21a of the high portion engages with the contact pin 23 of the lift lever 20, and the lift lever 20 is pulled in the direction of arrow C shown in FIG. 2 against the spring force of the spring 24. and rise in the opposite direction. The first and second swing frames 11 are in contact with the protrusion 20a of the lift lever 20 in accordance with the upward movement of the lift lever 20,
The extensions 11a and 12a of 12 are rotated around the fixed shaft 10 in a direction opposite to the directions of arrows A and B in FIG. It is separated from the feed control cam 7 and maintains its separated state. On the other hand, when the contact arm 96 of the first detector 95 also rotates with the rotation of the lift cam 21 and its contact 100 is separated from the contact piece 99a, the output signal RP2 from the contact piece 99a is as shown in FIG. As shown in the figure, the level changes from low to high. Thereafter, the contact 100' rotates around the operating shaft 27 and engages with the contact piece 99b, and the output signal RPI from the contact piece 99b is output at time T6 shown in FIG.
Its output signal R falls from high level to low level at
The fact that the PI has changed to a low level means that the cam surface 21a of the high portion of the lift cam 21 engages with the contact pin 23, and both the cam followers 21a engage with the contact pin 23, and the cam followers 13, This means that the separation operation of step 14 has been completed, and after the separation operation is completed, that is, at time T, the drive gear 51 is stopped and the contact pin 23 is connected to the cam surface 21a of the high portion. Since the engaged state is maintained, the output signal RPI of the first detector 95 is maintained at a low level state. The rising edge of the output signal RPI is supplied to the inverting input circuit of the monostable multipipe plate 147 via line L17, and the multipipe plate 147 is triggered to send a high level pulse signal from its non-inverting output terminal to the flip-flop circuit 148. is supplied to the set terminal S of. At that time, the flip-flop circuit 148 is set in response to the high-level pulse signal from the multi-pipulator 147 because the high-level output signal CP is supplied from the multi-input OR circuit 130 to its negative reset terminal R. generates a high-level output signal SP5 at its normal output terminal, and the high-level output signal SP5 is transmitted to the transistor 16.
6 to turn on its transistor 66. As a result, the excitation coil 63c is excited, and the third electromagnetic solenoid 63 pulls the actuating plate 64 into the spring 65.
The actuating plate 64 is spaced apart from the free end 62b of the spring clutch 62 to engage the pulley 49.
The rotation in the direction of arrow E is transmitted to the drive pulley 52 via the spring clutch 62. The rotation of the drive pulley 52 is transmitted to the gear 57 via the pulley 54 and the gear 56, and the first and second selection cams 25, 26 are rotated together with the gear 57. The first and second moving levers 29, 3, the contact head 30a and the contact pin 34 are connected to the selection cams 25, 2.
6, the first and second support shafts 31, 32 are engaged with the cam surfaces of both selected cams, respectively.
The first and second cam followers 13 and 14 are rotated around the fixed shaft 10 and the pins 33 and 35 provided at the free ends of both moving levers 29 and 30 are engaged with each other in the axial direction of the fixed shaft 10. will be moved to Further, as the selection cams 25 and 26 rotate, the contact arm 105 of the second detector 104 rotates clockwise in FIG. 3, and the contact 108 is separated from the contact piece 202. is the contact piece 203,
204, etc., continue to rotate around the operating shaft 27 while being engaged with each other. The contact piece that engaged with the contact 108 is the contact 109
The light emitting diode connected to the contact piece is turned on while the contact piece is engaged with the contact piece 108, and the light emitting diode connected to the contact piece is turned on. The light emitting diodes are sequentially blinked as the light rotates. This blinking operation of the light emitting diodes is performed sequentially toward the light emitting diodes LED2 to LED12 shown in FIG. Every time the contact arm 105 rotates and the contactor 108 engages with the contact piece, the second detection section 104 changes its detection signals PI to P12, and sends the detection signals PI to P12 to the logic circuits LGI to LG1. 2, respectively.

Now, when the contact 108 separates from the contact piece 202, the output signal P2 from the contact piece 202 changes from low level to high level, but the monostable multivibrator 29 receiving the output signal P2 is not triggered and the flip-flop circuit 128 continues the reset state, and the multi-input OR circuit 130
The output signal CP remains at a high level and does not change. Next, when the contactor 108 engages with the contact piece 203, the output signal from the contact piece 283 falls from a high level to a low level, and the falling signal is transmitted to a monostable multivibrator of a logic circuit LG3 (not shown). 29 to trigger the monostable multipipulator tortoise 29;
As a result, a high level pulse signal is generated at the normal output terminal of the monostable multipipulator tortoise 2g' and supplied to the IJ set terminal R of the flip-flop circuit group 2g'. However, since the flip-flop circuit group 28 is already in the reset state, it continues to be in the lj set state regardless of whether the high level pulse signal is supplied to the reset terminal R, and the output signal CP of the multi-input OR circuit 38 is at a high level. The operation of this logic circuit LG3 is similar to that of logic circuits LG4 to L.
In G color 2, it is also carried out sequentially, so "Contact child wealth Q
The output signal C of the multi-input OR circuit turtle 38 is output from the time when the contact piece 8 is separated from the contact piece 2 until it engages with the contact piece 212.
P remains at a high level and does not change. Said first
and a pattern cam 5 and a feed control cam suitable for the second cam follower child turtle 3914 to form a zigzag stitch pattern? When moved to a position opposite to the contact piece 2, the contact piece 2 separates from the turtle 2 and engages with the contact piece 28, and the contact piece 21
The output signal PI from the contact piece 2QI rises from a low level to a high level, and the output signal PI from the contact piece 2QI falls from a high level to a low level at the time shown in FIG.
At the same time, the light emitting diode LED 2 connected to the contact piece 21 2 changes from the lighting state and is turned off, and the light emitting diode LED 2 connected to the contact piece 28 is turned on and maintains its lighting state. A figure SBI representing a zigzag stitch pattern is designated by continuous lighting of the light emitting diode LEDI. In addition, ``When the amount of the output signal P falls from a high level to a low level, the falling signal is supplied to the negative input circuit of the monostable multivibrator 29 of the logic circuit LGI and multivibrates it.''
Trigger the multi-vibrator 29
generates a high level pulse signal LP3 at its normal output terminal. From the above explanation, since only the flip-flop circuit 128 of the logic circuit LG is in the set state, the flip-flop circuit 128 receives the high-level pulse signal L from the monostable multipipe layer 29 in the reset state R.
It is reset when it receives P3 and puts its normal output terminal in a low level state. Therefore, the logic circuits LGI to LGq
When all of the output signals of 2 become low level, the output signal CP of the multi-input OR circuit 130 falls from a high level to a low level, and the falling signal is input to the negative reset terminal R of the flip-flop circuit 148. As a result, the flip-flop circuit 1481 is reset and its output signal SP5 changes from a high level to a low level, and the transistor 66 that received the low level output signal SP5 is reset.
is turned off to cut off the power supply to the excitation coil 63c.
When the excitation coil 63c is deenergized, the actuating plate 64 is pulled at the free end 62 of the clutch 62 by the action of the tension force 65.
When the free end 62b of the spring clutch S2 engages with the actuating plate 64, the rotation of the pulley 49 is no longer transmitted to the drive pulley 52, and the drive pulley lj52 stops. be done. As the drive pulley 52 stops, the first and second cam follower blinds 3, 14
Is the pattern cam 5 and feed control cam suitable for forming a zigzag stitch pattern? is held in a position opposite to Furthermore, the fall of the output signal CP is caused by the monostable multivibrator 41.
The multivibrator 4 generates a high-level pulse signal at its normal output terminal and inputs it to the OR circuit 8, which triggers the multivibrator 41. Output signal S of circuit turtle 40
P3 temporarily changes to a high level at time T7.
The high level output signal SP3 is supplied to the base of the transistor 158 to turn on the transistor 58, thereby energizing the excitation coil 59c, and the second electromagnetic solenoid 59 attracts the actuation plate 60 again and operates the spring clutch. The spring clutch 5 is separated from the free end 58C of the spring clutch 5, and immediately thereafter the actuating plate 6 is biased by the action of the tension imitation 61 so as to be able to engage with the free end 58b of the spring clutch 5. Due to the separating operation of the actuating plate 60, the pulley 4
9 is again transmitted to the drive gear 51 via the spring clutch 58.
One rotation is transmitted, and the lift cam 21 and the contact arm 96 of the first detector 95 are rotated one rotation around the operating shaft 27. The lift cam 21 rotates half a rotation while the drive gear 51 makes one rotation, and engages the lower cam surface 21b with the contact cam 23.
Since the drive gear 51 stops after one rotation, the engagement state between the cam surface 21b of the lower portion and the contact pin 23 is maintained. During the half rotation of the lift cam 21, the lift lever 21 is rotated in the direction of arrow C by the action of the tension spring 24, and the first and second swing frames 11 and 12 are rotated in the directions of arrows A and B. As the two swing frames rotate, the first and second cam followers 13 and 14 engage with the pattern cam 5 and feed cam 7, which are suitable for forming a zigzag stitch pattern, respectively, and maintain the engaged state. . On the other hand, as the contactor 100 is separated from the contact piece 99b by the rotation of the contact arm 96, the output signal RPI from the contact piece 99b changes from a low level to a high level, and the high level output signal RPI is supplied to the unit. The stable multipipulator 147 is not triggered and supplies a low level signal to the set terminal S of the flip-flop circuit 148. Therefore, the flip-flop circuit 148 maintains its reset state due to the falling edge of the output signal CP. The output signal SP6 is held at a low level.
Thereafter, when the contactor 100 engages with the contact piece 99a, the output signal RP2 from the contact piece 99a falls from a high level to a low level at time T8 shown in FIG. The signal is supplied to the inverting input circuit of the pipelator 137 to trigger the multipipelator 137, so that the multipipelator 137 generates a low level pulse signal from its inverted output terminal and supplies it to the inverting reset terminal R of the flip-flop circuit 136. However, the flip-flop circuit 136 is reset and changes its output signal SP2 from high level to low level. The transistor 154 to which the low-level output signal SP2 is supplied turns off and cuts off the power supply to the excitation coil 69c, thereby switching the first operating switch 69a of the first relay 69 to the conjunct point a. The second activation switch 69b is opened. Thus, the power supply to the field winding 38a and armature 38b of the sewing machine motor 38 is completely cut off, and the sewing machine motor 38 is stopped. Further, when the output signal SP2 of the flip-flop circuit 136 falls from a high level to a low level at time T8, the delay circuit consisting of the monostable multivibrators 44 and 145 operates in response to the falling signal, and After the delay time has elapsed, a low-level pulse signal is generated at the inverting output terminal of the monostable multipipulator 145, and the low-level pulse signal is supplied to the negative reset terminal R of the flip-flop circuit 146. to be reset. The reset flip-flop circuit 146 outputs its output signal SP4 at time t9 shown in FIG.
from a high level to a low level, and the low level output signal SP4 is supplied to the base of the transistor 162 via the line L20 to
is turned off, thereby cutting off the power supply to the excitation coil 45c. By demagnetizing the excitation coil 45c, the first electromagnetic solenoid 45 stops attracting the actuating plate 46, and the actuating plate 46 is separated from the free end 44b of the spring clutch 44 by the action of the tension spring 47. This separating operation of the operating plate 46 connects the main shaft pulley 41, handwheel 43, and main shaft 1 via the spring clutch 44. However, since the delay time is set so that the sewing machine motor 38 to which the power supply is cut off completely stops after time T8, when the main shaft pulley 41, handwheel 43, and main shaft 1 are connected, Since the sewing machine motor 38 is in a stopped state, there is no risk that the main shaft 1 will rotate immediately after the selection operations of the pattern cam 5 and the feed control cam 7 are completed. As explained above, when the manual switch SWI corresponding to a zigzag stitch pattern is pressed, the pattern cam 5 and the feed control cam 7, which are passed through to form the zigzag stitch pattern, are reversed. The stitch pattern is automatically selected by driving, the stitch pattern display is automatically switched, and the light emitting diode LEDI corresponding to the zigzag stitch pattern is turned on.

After completing the selection of the pattern cam 5 and feed control cam 7 suitable for forming a zigzag stitch pattern (at time TI shown in FIG.
O) When the start/stop plow 133b is pressed to close the start/stop switch 133a to form the zigzag stitch pattern, a signal LP5 shown in FIG. is entered,
In response to the fall of the signal LP5, the flip-flop circuit 131 is set to change the output signal SPI from a low level to a high level. The high level output signal SPI is applied to the base of transistor 150 via line L18 to turn on that transistor 50, thereby energizing the excitation coil 82c through transistor 150 to activate the second relay 82 switch. 82
A is closed as shown by the dotted line in FIG. By closing the actuation switch 82a, the gate voltage set by any one of the speed setting switches 79a to 81a is supplied to the gate of the thyristor 66, and the thyristor 66 receives the gate voltage. The field winding 38a and the armature 3
Electric power is supplied to the series circuit 8b, and the sewing machine motor 38 receiving the electric power is driven to rotate at a speed selected from three speeds. Field winding 38 of the sewing machine motor 38
Since current flows from the first bus bar 67 to the second bus bar 68 in the armature a and the armature 38M, the sewing machine motor 38 rotates in the forward direction and rotates the main shaft pulley 41 in the direction of arrow D. At this time, the forward rotational force of the sewing machine motor 38 is transmitted to the pulley 49 and drive shaft 48 to rotate them in the direction opposite to the direction of arrow E. However, since the spring clutches 58 and 62 have the function of one-way clutches, the sewing machine The positive rotational force of the motor 38 is not transmitted to the drive gear 51 and the drive pulley 52, and the first and second cam followers 13 and 14 are connected to the pattern cam 5 and feed control cam suitable for forming a zigzag stitch pattern. 7
maintain engagement with the Arrow D of the main shaft pulley 41
The rotational force in the direction is transmitted to the handwheel 43 and the main shaft 1 via the spring clutch 44, and as the main shaft 1 rotates, the pattern cam 6 and the feed control cam 7 are rotated, and the rotational force is transmitted via the two cam followers 13 and 14. This gives the sewing needle 4 a lateral swinging motion and causes the feed dog 6 to perform a feeding motion. Thus, the zigzag stitch pattern selected by the operator is formed on the work cloth. In the first embodiment described above, the light emitting diodes LEDI to LED12 blink in response to the detection signals PI to P12 from the second detector 104, respectively, and the desired pattern cam 5 and feed control cam 7 are selected. light emitting diode LE corresponding to the zigzag stitch pattern selected by manual switch SWI in connection with the completion of
DI is automatically lit continuously, and the operator can visually confirm the completion of the cam selection operation by the continuous lighting of the light emitting diode LEDI.

In the embodiment described above, a cam selection device using a so-called single cam follower is shown in which the first cam follower 13 is moved in the axial direction of the fixed shaft 10 in order to select the pattern cam 5. The invention is not limited to this cam selection device using a single cam follower, but can of course be implemented in a device that performs cam selection by providing a plurality of cam followers each facing a plurality of pattern cams. That's true.

Further, although various embodiments of the discriminating device 149 shown in FIG. 3 are possible, a microcomputer may be used in place of the discriminating device 149 in order to downsize the sewing machine. In the embodiment, the sewing machine motor 3
8 as a shunt motor, and a signal related to the actual speed of the sewing machine motor 38 during its cam selection operation (voltage from the sliding terminal 92 of the sliding resistor 92) is connected to the transistor 90, the capacitor 88 and the adjusting resistor. 89b etc., the rotational speed of the sewing machine motor 38 during the cam selection operation is maintained at a predetermined low speed, and the cam selection operation is performed by constant low-distance driving of the sewing machine motor 38. The device can reliably select the pattern cam 5 and the feed control cam 7.

Further, during the cam selection operation, the sewing machine motor 38 rotates in the opposite direction to the direction of rotation when forming the stitch pattern to operate the cam selection actuating device, and the sewing machine motor 38
Since a spring clutch 44 having a one-way clutch function is provided between the main shaft pulley 41 and the handwheel 43 so that the reverse rotational force of the sewing machine is not transmitted to the sewing machine main shaft 1,
There is no danger that the sewing machine main shaft 1 will rotate during the cam selection operation, and the cam selection operation can be performed safely. As is clear from the above description, the present invention provides an electromagnetic operating device that operates a cam selection actuating device including a cam follower in a cam built-in zigzag sewing machine, and an electromagnetic operating device that operates a cam selection actuating device including a cam follower, and an electromagnetic operating device that operates a cam selection actuating device including a cam follower. A control device that controls power supply and a number of display elements that display a pattern according to a detection signal representing the position of the cam follower are provided, and the cam The selection actuator is actuated by the action of an electromagnetic actuator to move the cam follower to a position opposite to the pattern cam corresponding to a desired stitch pattern and engage the cam, making selection of the pattern cam simple. This can be done automatically by simply operating a manual switch.

Furthermore, while the cam follower moves to a position facing the desired pattern cam, the display elements corresponding to each pattern cam that the cam follower faces are sequentially lit in accordance with the detection signal. The progress of the selection operation until the selection is completed can be continuously notified to the sewing fabricator.
It is possible to completely eliminate the worker's anxiety when selecting a pattern.

[Brief explanation of drawings]

1 to 6 are drawings for explaining an embodiment of the present invention, in which FIG. 1 is a perspective view of a sewing machine equipped with a pattern cam selection device, FIG. 2 is a perspective view showing the mechanical configuration, and FIG. 3 is a wiring diagram showing the electrical configuration, FIG. 4 is a wiring diagram showing the discrimination device, FIG. 5 is a time chart for explaining the operation of the logic circuit, and FIG. 6 is for explaining the operation of the discrimination device. This is a time chart for In the diagram, 1 is the sewing machine main shaft, 2 is the sewing machine frame, 4 is the sewing needle, and 5
1 is a pattern cam, 6 is a feed dog, 7 is a feed control cam, 10' is a fixed shaft, 13 and 14 are first and second cam followers, 2 is a foot lever from the river, 21 is a lift cam, 25 and 26 are the 1
and a second selection cam, 38 is a sewing machine motor, 38a is a field winding, 38b is an armature, 44 is a spring clutch, 45 is a first electromagnetic solenoid, 58 is a spring clutch, 59 is a second electromagnetic solenoid, 62 is a spring clutch, 63 is the third
, 66 is the first thyristor, 69 is the first relay, 82 is the second relay, 85 is the second thyristor, 88 is the capacitor, 89b is the adjustment resistor, 9 is the thyristor
NP type transistor, 91 is a sliding resistor, 95 is a first detector, 104 is a second detector, 124 is a code signal generator, 125 is a manual switch group, 149 is a discrimination device, 1
50, 154, 158, 162, 166 are NPN transistors, LGI to LG12 are logic circuits, SWI to SW12 are manual switches, LEDI to LED12 are light emitting diodes, SCI to SC12 are electrical signals, P
I to P12 are detection signals. Figure 1 Figure N Boat chart dimensions Figure 5 Figure 6

Claims (1)

[Claims] 1 A plurality of pattern cams for forming various kinds of predetermined stitch patterns, and a sewing needle capable of being engaged with each of the pattern cams and imparting a lateral rocking motion to the sewing needle according to the shape of each cam. A zigzag sewing machine comprising a cam following means and a cam selection actuating device for moving the cam following means to a position opposite to at least one desired cam among the pattern cams and engaging the cam, the zigzag sewing machine comprising: A large number of manual switches are provided corresponding to each stitch pattern in order to select a desired stitch pattern from a wide variety of stitch patterns, and the stitch pattern is selected according to the operation of the manual switch. a code signal generating device for generating a code signal corresponding to the pattern cam; an electromagnetic operating device for operating the cam selection actuating device to change the relative position of the cam follower with respect to each of the pattern cams; and the cam selection actuating device. a detection device for detecting the position of the cam following means that changes due to the operation of the cam follower and generating a detection signal; a discriminating device that receives the code signal and the detection signal to determine whether or not the opposing position has been reached; a control device that controls power supply to the electromagnetic operating device according to the discriminating result of the discriminating device; A pattern cam selection device comprising: a plurality of display elements disposed corresponding to each stitch pattern to selectively optically display the various types of stitch patterns and sequentially lit in accordance with the detection signal.