JPH0186974U

JPH0186974U -

Info

Publication number: JPH0186974U
Application number: JP18219887U
Authority: JP
Priority date: 1987-11-30
Filing date: 1987-11-30
Publication date: 1989-06-08

Description

[Brief explanation of drawings]

図面は本考案の一実施例を示すもので第１図ａ
，ｂは本実施例の電気的構成を示すブロツク図、
第２図は本実施例の布縁倣い縫ミシンの外観を示
す斜視図、第３図は上記ミシンの頭部をそのカバ
ーを外した状態で示す斜視図、第４図はパルスコ
ントローラの発生するパルス信号のタイミングを
示すタイミングチヤート、第５図は速度制御装置
の動作を示すフローチヤートである。図中、１０はベツド、４０は針棒、４２は縫針
、５４は布検出器、５６は発光部、５８は受光部
、７０は加工布、１００は針揺動アクチユエータ
、１０２はアナログスイツチ、１１０は針位置制
御装置、１２０はラツチ回路、１３０は判別装置
、１３２は内部レジスタ、１３４は演算装置、１
３７は第２の可変抵抗器、１５０は第３の可変抵
抗器、１５４は速度制御装置、１５８はミシンモ
ータである。 The drawings show one embodiment of the present invention and are shown in Figure 1a.
, b are block diagrams showing the electrical configuration of this embodiment,
Fig. 2 is a perspective view showing the external appearance of the fabric edge copy sewing machine of this embodiment, Fig. 3 is a perspective view showing the head of the sewing machine with its cover removed, and Fig. 4 is a perspective view showing the pulse controller's generator. FIG. 5 is a timing chart showing the timing of the pulse signal and a flow chart showing the operation of the speed control device. In the figure, 10 is a bed, 40 is a needle bar, 42 is a sewing needle, 54 is a cloth detector, 56 is a light emitting part, 58 is a light receiving part, 70 is a work cloth, 100 is a needle swing actuator, 102 is an analog switch, 110 1 is a needle position control device, 120 is a latch circuit, 130 is a discrimination device, 132 is an internal register, 134 is an arithmetic device, 1
37 is a second variable resistor, 150 is a third variable resistor, 154 is a speed control device, and 158 is a sewing machine motor.

Claims

[Claims for Utility Model Registration] A needle bar 40 having a sewing needle 42 attached to its lower end and capable of vertical and reciprocating movement and lateral rocking movement;
a sewing machine motor 158 operatively connected to the needle bar 40 for vertically reciprocating the sewing machine motor 158; a speed setting means 150 for setting the rotational speed of the sewing machine motor 158; and a lateral rocking of the needle bar 40. It has an actuator 100 operatively connected to the needle bar 40 for controlling the position, a light emitting part 56 and a light receiving part 58, and has a side edge extending in the feeding direction of the work cloth 70 placed on the sewing machine bed 10. A position control signal for controlling the swinging position of the needle bar 40 according to the amount of light received by the fabric detector 54 and the light receiving section 58 is generated in synchronization with each up and down reciprocating movement of the needle bar 40. The needle position control means 110 drives the sewing machine motor 158 at a speed set by the speed setting means 150, and drives the actuator 100 in accordance with the position control signal to move the sewing machine at a predetermined distance from the side edge. In a fabric edge copy stitch sewing machine that forms a seam line at a position, a storage means for temporarily storing the position control signal from the control means 110 and updating the stored contents in synchronization with each up and down reciprocating movement of the needle bar 40. 12
0, and a discriminating means 130 that generates a first discriminating signal when the value of the signal corresponding to the change in the amount of light received by the light receiving section 58 is smaller than a predetermined value, and generates a second discriminating signal when the value is greater than or equal to the predetermined value. , when the discrimination means 130 generates the first discrimination signal, it operates to supply the latest position control signal from the needle position control means 110 to the actuator 100, and the discrimination means 130 generates the second discrimination signal. When the needle position control means 110
a switching means 102 that operates to stop the supply of a position control signal from the actuator 100 and supply the previous position control signal stored in the storage means 120 to the actuator 100; While the signal is being generated, the sewing machine motor 158 is rotated at the speed set by the speed setting means 150, and while the determining means 130 is generating the second determination signal, the sewing machine motor 1. A fabric edge profiling sewing machine characterized by comprising a speed control means 154 that reduces the rotation speed when the rotation speed of the cloth edge profiling stitch 158 is higher than a predetermined speed.