JP3375152B2 - Sewing machine safety device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a sewing machine that controls and drives a drive system such as a motor, which can be used extremely safely at the time of starting, with electric power. . 2. Description of the Related Art The prior art is disclosed in Japanese Patent Publication No. 59-44.
No. 076 exists. In this case, first, in a state where the start signal is output from the controller for some reason, when the power is turned on, the state in which the drive of the drive system is prohibited is merely maintained. Second, the only condition for releasing the drive inhibition state is to temporarily stop the start signal. [0003] In the above first,
The operator cannot notify that the dangerous operation has been performed. The operator cannot grasp the degree of danger of the operation. It is difficult to cope when the operator is not directly involved. And the like. [0004] In the second method, an erroneous signal may be output intermittently due to poor contact or the like, causing a sudden start, and an extremely dangerous state is expected. There is a very high possibility that the driving is canceled without grasping the driving inhibition state. And so on. The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have found that the present invention relates to a sewing machine that controls and drives a drive system such as a motor with electric power. A power switch having a switch mechanism for supplying power to the sewing machine, a start signal generating device such as a controller or a start / stop switch, and temporarily turning off power supply to a drive device when the power switch is turned on. A shutoff device to be held, a start signal generating device for monitoring a start signal generating device when the power is turned on, and a judging device for judging whether it is safe or dangerous. At the same time, the safety switch of the sewing machine is characterized in that the power switch is turned off. Can solve the above-mentioned problem and achieve the object. An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The present invention mainly relates to a start signal generator A such as a controller 1 or a start / stop switch 2 and a start signal generator A when a power is turned on in a sewing machine that controls and drives a drive system such as a motor by electric power. And a determining device B for determining whether or not it is safe, and an interrupting device C for interrupting the power line by an output from the determining device B.
And a switch mechanism D capable of opening and closing electric power required for the sewing machine. A start signal generator A such as the controller 1 or the start / stop switch 2 generates a start / stop signal required for controlling the driving device F (driving system F), and the signal (start signal; 1, A stop signal (0) is output to the control device E and the judgment device B. The judging device B monitors the output of the start signal generating device A and the output of the shut-off device C immediately after the power is turned on for a certain period of time, and outputs 1 to the shut-off device C in the case of a dangerous operation. If the safety is confirmed, monitoring is canceled. The shut-off device C is configured to shut off the power supply line according to the signal of the judging device B, to be able to hold the state, and to be able to output the signal 1 indicating the cut-off state. The switch mechanism D operates the power switch 3 to turn on / off the power. The control device E is configured to control the normal system with respect to the driving device F by receiving signals from the start signal generating device A, the interrupting device C, and the like. It is configured to be driven. The shut-off device C is provided with a relay RE1, and the contact a is provided so as to be connected to the control device E.
The contact b is provided to be connected to the switch mechanism D. The judgment device B is provided with a timed relay RE4. The timed relay RE4 is held for a certain period of time, and after a certain time, the timed relay RE4 is shut off to become a contact j. I have. Further, in the state of the contact point i, the relay RE3 is operated to change from the contact point g to the contact point h, and the contact point g outputs the signal of the start signal generator A to the controller E as an output signal. It is configured. Further, when the contact point h is reached, the signal from the start signal generator A is output to the controller E when the output signal is first output to the controller E for some reason. Therefore, the relay RE2 operates so that the contact f becomes the contact f instead of the contact e.
E1 is configured to be in an operating state. The switch mechanism D is specifically configured as a power switch 3 and provided with a tripping coil (see FIG. 2). When the relay RE1 of the shutoff device C operates, a current is applied to the contact b. Works only when air flows
It is configured to be in the F state. The power switch 3 may not be provided with a tripping coil (see the flowchart in FIG. 4). Reference numeral 4 denotes a speed adjustment key. Next, the operation will be described. First, when the power is turned on (see S1), immediately after that, the power switch 3 is turned on.
The current (Q) flows through the coils of the relay RE3 and the timed relay RE4 because the ON state of the relay RE1 is mechanically self-held and the contact a of the relay RE1 is closed. Since the relay is the time-limited relay RE4, the magnetizing operation is performed after a lapse of a predetermined time, and the current flows through the relay RE3 until the contact is switched from the contact i to the contact j. At this time, the timer of the timed relay RE4 starts (S2
Reference), the relay RE3 is excited while current is flowing through the coil, is connected to the contact point h, and the signal path of the controller 1 is connected to the line of the relay RE2. In this state, the level of the start signal (P) is monitored by the controller 1 and the like (see S3), and it is determined whether the start signal (P) is in the ON state (S3).
4), when the start signal (P) is generated, the relay RE2 is excited as the determination device B to switch from the contact e to the contact f in order to determine that it is dangerous, and the output signal (U)
To the shut-off device C (a state in which the current (W) from the power supply makes the relay RE1 operable). The relay RE1 of the shut-off device C is switched from the contact a to the contact b by the output signal (U) to cut off the power supply to the control device E and the judging device B, and the contact d is switched to the contact c and held. State. As a result, the power supply lines after the cutoff device C are cut off and held, and the power supply to the control device E including the drive system and the drive device F such as a motor is cut off (see S5). By using a power switch 3 having a trip coil and connecting it to the relay RE1, a signal for the trip coil of the power switch 3 is provided when the shut-off device C is operated (when shut off). (See S6 in FIG. 3), the mechanical self-holding of the ON state of the power switch 3 is forcibly released. That is, the power switch 3 is turned off (see S7 in FIG. 3). As described above, there is an advantage in that alerting the operator to the danger state can call attention without separately preparing the sewing machine as a display device. In the above description of the operation, the relay R
In a state where E1 is closed, power is supplied to the control device E, but at this time, since the relay RE3 is operated and the start signal (P) of the controller 1 is not output to the control device E, the drive is performed. Device F is not driven. In the above description, if there is no start signal (P) from the controller 1 within a certain time after the power is turned on, after a predetermined time timer has elapsed (S8 in FIG. 3,
4), the safety state is determined, the timed relay RE4 is energized, the contact i is switched to the contact j and held, the excitation is released by the relay RE3, and the contact is changed from h to contact g. The controller 1 switches to the control device E
And the normal operation of the driving device F is enabled (see S9 in FIG. 3 and S7 in FIG. 4). That is, the drive circuit is turned ON by the level signal (see S9 in FIG. 3 and S7 in FIG. 4), and controls the motor drive device F according to the level of the controller 1 (S10 in FIG. 3, FIG. 4). Then, the desired sewing operation is performed, and the controller 1 is appropriately stopped (see S11 in FIG. 3 and S9 in FIG. 4), and the process ends. When the power switch 3 having a trip coil is not used (see FIG. 4), the power supply line is only kept in the cut-off state (see S5 in FIG. 4). According to the present invention, in a sewing machine for controlling and driving a drive system such as a motor by electric power, a power switch 3 having a switch mechanism for supplying electric power to the sewing machine, a controller 1 or a start / stop switch. A start signal generating device A such as a stop switch 2, a shutoff device C for temporarily interrupting and holding power supply to the driving device when the power switch 3 is turned on, and a start signal generating device A when the power is turned on. A judgment device B for judging whether it is safe or dangerous, and a sewing machine for holding the shut-off device C in a power-off state and turning off the power switch 3 based on the judgment result of the judgment device B for danger. In particular, when the safety device is used, the start signal generator A is monitored when the power is turned on, and the determination device B determines that the status is dangerous. It is possible to hold the shut-off device C in a power shut-off state and to forcibly shut off the power by turning off the power switch 3 to call attention to the operator without separately displaying a danger state. There are advantages that can be done. [0025]

[Brief description of the drawings] FIG. 1 is a block diagram of the present invention. FIG. 2 is a simplified diagram in which an embodiment is added to a block diagram of the present invention. FIG. 3 is a flowchart of the present invention. FIG. 4 is a flowchart of another embodiment of the present invention. FIG. 5 is a perspective view of a sewing machine and a controller. [Explanation of symbols] A: Start signal generator B: Judgment device C ... Interrupting device D ... Switch mechanism 1. Controller 2. Start / stop switch

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akiyoshi Sasano 3-1-1 Kyobashi, Chuo-ku, Tokyo, Janome Eye Sewing Machine Industry Co., Ltd. (56) References JP-A-4-71593 (JP, A) Shokai 56-73185 (JP, U) JP-B-59-44076 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (1)

(57) [Claim 1] In a sewing machine that controls and drives a driving system such as a motor with electric power, a power switch having a switch mechanism for supplying electric power of the sewing machine, a controller and a controller.
There will monitor the start signal generating device such as a start / stop switch, a shut-off device that temporarily interrupted to hold the power supply to the drive unit when the power is turned on by the power switch, a start signal generating device when the power is turned on, A judgment device for judging whether it is safe or dangerous, and a sewing machine characterized in that the shut-off device is kept in a power-off state based on a judgment result of the danger of the judgment device, and the power switch is turned off. Safety device.