JPS6247374U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cloth presser foot of a cloth edge tracing sewing machine which is an embodiment of the present invention. FIG. 2 is a plan view showing the work cloth and cloth presser foot set in the same sewing machine. FIG. 3 is a front view of the head of the sewing machine with its cover removed. Fourth
The figure is an explanatory diagram showing the relative positional relationship between the fabric detector and the reflective surface in the same sewing machine, and the range in which linearity can be obtained in the fabric detector. FIG. 5 is a block diagram showing the control circuit of the sewing machine. FIG. 6 is an explanatory diagram showing needle position control in the same sewing machine. FIG. 7 is a plan view showing a first work cloth and a second work cloth to be sewn together by the same sewing machine. Figures 8 and 9 are graphs showing the results of a comparative test between using the same light-emitting element and light-receiving element as a reflective type photo sensor to detect the cloth edge position and using it as a transmission type photo sensor. be. 2: Bed, 4: Upper arm, 5: Sewing machine frame, 14: Sewing needle, 48: Fabric presser foot, 62: Notch, 66: Extension body, 67: Lower end, 68: Fabric detector, 70: Light emitting Element (light emitting part), 72: Light receiving element (
76: Reflective surface, 79: Feed dog (feed device), 82: Stitch data generator, 86: Needle swing calculation device, 89: Feed amount adjustment device, 90: Needle swing adjustment device, 94 :Multiplexer (control device),
96: Needle swing control circuit (control device), 100: Needle swing control motor, 110: Copy sewing control device, 11
2: Adder (conversion means), 114: A/D converter (conversion means), 116: Adder (conversion means), 1
18: Seam allowance data memory (conversion means), 130:
Fabric (first processed fabric), 132: Pocket fabric (second processed fabric).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sewing needle capable of vertical reciprocating motion and horizontal oscillating motion, and a feed that works with a cloth presser foot to transport the workpiece fabric in a direction perpendicular to the oscillating direction of the sewing needle. a device;
A zigzag sewing machine is equipped with a control motor operatively connected to the sewing needle in order to control the lateral swing position of the sewing needle, and the position of stitch formation on the workpiece cloth is changed by driving the control motor. On the first wide workpiece cloth to be placed, a light emitting section is arranged close to each other in order to detect the edge of a second workpiece cloth, which is positioned so as to be offset from the first workpiece cloth. a cloth detector comprising a light-receiving section; a notch formed in the widthwise direction of the presser foot from one side in the left-right direction at an intermediate portion in the front-rear direction of the presser foot that presses the first work cloth; provided at the lower end of an extension body extending downward from the sewing machine frame or a member attached thereto to near the notch of the presser foot in order to reflect the emitted light from the light emitting unit toward the light receiving unit; a reflective surface that can be interposed between the two workpiece cloths near the notch; a converter that converts the amount of light received by the light receiving section into a position command signal regarding the horizontal swing position of the sewing needle; Accordingly, the method includes a control device for controlling the drive of the control motor, and is characterized in that a continuous seam is formed at a position a predetermined distance from an edge of the second work cloth to sew the two work cloths together. Fabric edge copy sewing machine. (2) The cloth edge tracing sewing machine according to claim 1, wherein the reflective surface is disposed on the front side of the notch of the cloth presser foot.