Photoelectric type weft sensing process and weft sensor

Claim 2

Photoelectric type weft sensing process on weaving looms comprising emitting light beams for sensing weft from one vertical side of a plurality of warp sheets forming a warp shed at a position about the middle of the lathe length in such a manner that said light beams advance across the course of the weft under picking, receiving said light beams on the other vertical side of the warp shed so that weft-images are clearly detected from an image caused by interruption of said light beam by said warp shed, converting photoelectrically said light beams so received into corresponding electric signals, subjecting said electric signals so obtained to an electric discrimination for identifying whether said weft exists or not at the time of a picking motion and interrupting the running of the loom only when said electric signals indicate the absence of weft at the time of picking motion.

Claim 3

Photoelectric type weft sensing process as claimed in claim 1 wherein said light beams advance from upper side to underside of said warp shed.

Claim 4

Photoelectric type weft sensing process as claimed in claim 1 wherein said light beams advance from under side to upper side of said warp shed.

Claim 5

Photoelectric type weft sensor comprising, in combination, a light emitter located on one vertical side of a plurality of warp sheets forming a warp shed at a position about the middle of the lathe length with its light emitting and confronting the warp shed, a light receiver located on the other vertical side of said warp shed with its light receptive and confronting said light emitting end of said light emitter, at least one photoelectric cell incorporated within said light receiver, a weft-image selector mechanism incorporated in said light receiver for clearly separating weft-images from luminous images caused by said warp shed, a discrimination circuit for indentifying whether said weft exists or not at the time of a picking motion electrically connected to said light receiver and an operation terminal forming a part of said discrimination circuit for interrupting the running of the loom when the absence of weft at the time Of picking motion is sensed.

Claim 6

Photoelectric type weft sensor comprising, in combination, a light emitter located on one vertical side of a plurality of warp sheets forming a warp shed at a position about the middle of the lathe length with its light emitting and confronting the warp shed, a light receiver located on the other vertical side of said warp shed with its light receptive and confronting said light emitting end of said light emitter, at least one photoelectric cell incorporated within said light receiver, a weft-image selector mechanism incorporated in said light receiver for clearly separating weft-images from luminous images caused by said warp shed, a discrimination circuit for indentifying whether said weft exists or not at the time of a picking motion electrically connected to said light receiver and an operation terminal forming a part of said discrimination circuit for interrupting the running of the loom when the absence of weft at the time Of picking motion is sensed.

Claim 7

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter is disposed in said lathe, said light receiver is disposed in the reed cap of the loom, said light receiver includes a cavitied casing and said weft-image selector includes a lid disposed to the light receptive side end of said casing and having one light passable window formed therethrough.

Claim 8

Photoelectric type weft sensor as claimed in claim 5 wherein said window is in the form of a straight slit running in the weft direction.

Claim 9

Photoelectric type weft sensor as claimed in claim 5 wherein said window is in the form of an X-shaped slit, each branch of which is parallel to one of the directions that wefts are inserted.

Claim 10

Photoelectric type weft sensor as claimed in claim 5 wherein said discrimination circuit includes a gate circuit connected to said light receiver, a shaping circuit connected to said gate circuit, a differentiation circuit connected to said shaping circuit, a rectifier circuit connected to said differentiation circuit, a shaping circuit connected to a synchronizing pulse producing mechanism, a rectifier circuit connected to said shaping circuit via an inverter circuit and a differentiation circuit, a flip-flop circuit connected to said rectifier circuits, an inverter circuit connected to said shaping circuit via a differentiation circuit, a rectifier circuit and a one-shot-multi-vibrator circuit, a NOR circuit connected to said flip-flop circuit and to said inverter circuit and said operation terminal connected to the NOR circuit via a relay circuit.

Claim 11

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter is disposed in the reed cap, said light receiver is disposed in said lathe of the loom, said light receiver includes a cavitied casing and said weft-image selector includes a lid disposed to the light receptive side end of said casing and having one light passable window formed therethrough.

Claim 12

Photoelectric type weft sensor as claimed in claim 9 wherein said window is in the form of a straight slit running in the weft direction.

Claim 13

Photoelectric type weft sensor as claimed in claim 9 wherein said window is in the form of an X-shaped slit, every branch of which is parallel to one of the directions that wefts are inserted.

Claim 14

Photoelectric type weft sensor as claimed in claim 9 wherein said discrimination circuit includes a gate circuit connected to said light receiver, a shaping circuit connected to said gate circuit, a differentiation circuit connected to said shaping circuit, a rectifier circuit connected to said differentiation circuit, a shaping circuit connected to a synchronizing pulse producing mechanism, a rectifier circuit connected to said shaping circuit via an inverter circuit and a differentiation circuit, a flip-flop circuit connected to said rectifier circuits, an inverter circuit connected to said shaping circuit via a differentiation circuit, a rectifier circuit and a one-shot-multi-vibrator circuit, a NOR circuit connected to said flip-flop circuit and to said inverter circuit and said operation terminal connected to the NOR circuit via a relay circuit.

Claim 15

Photoelectric type weft sensor as claimed in claim 4 for sensing wefts having a number of inserting courss defined by a trace of weft connecting a selvage of cloth to a shuttle running through an opened shed along the shuttle lathe, wherein said light emitter is disposed in said lathe, said light receiver is disposed in the reed cap of the loom, said light receiver includes a cavitied casing and said weft-image selector mechanism includes a lid disposed to the light receptive side end of said casing and having at least three light passable windows.

Claim 16

Photoelectric type weft sensor as claimed in claim 13 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting courses and the remaining two of which are located on both sides of the first mentioned one aNd run parallel to the respective weft inserting courses.

Claim 17

Photoelectric type weft sensor as claimed in claim 13 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting courses and the remaining two windows being located on both sides of the first mentioned window and running at at least partly including respective weft inserting courses.

Claim 18

Photoelectric type weft sensor as claimed in claim 13 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting courses and the remaining two of which are located on one common side of the first mentioned one and run parallel to the respective weft courses.

Claim 19

Photoelectric type weft sensor as claimed in claim 13 wherein said lid includes five windows, one window of which meets the crossing point of two weft inserting courses, the other two of which are lcoated on one common side of the first mentioned one running parallel to respective weft courses and the remaining two of which are located on the other common side of the first mentioned one running parallel to respective weft courses.

Claim 20

Photoelectric type weft sensor as claimed in claim 4 for sensing wefts having a number of inserting courses defined by a trace of weft connecting a selvage of cloth to a shuttle running through an open shed along the shuttle lathe wherein said light receiver is disposed in said lathe, said light emitter is disposed in the reed cap of the loom, said light receiver includes a cavitied casing and said weft-image selector mechanism includes a lid disposed to the light receptive side end of said casing and having at least three light passable windows.

Claim 21

Photoelectric type weft sensor as claimed in claim 18 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting course and the remaining two windows being located on both sides of the first mentioned window and running parallel to respective weft inserting courses.

Claim 22

Photoelectric type weft sensor as claimed in claim 18 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting courses and the remaining two of which are located on both sides of the first mentioned window and run at least partly including respective weft inserting courses.

Claim 23

Photoelectric type weft sensor as claimed in claim 18 wherein said lid includes three windows, one window of which meets the crossing point of two weft inserting courses and the remaining two of which are located on one common side of the first mentioned one and run parallel to respective weft courses.

Claim 24

Photoelectric type weft sensor as claimed in claim 18 wherein said lid includes five windows, one window of which meets the crossing point of two weft inserting courses, the other two of which are located on one common side of the first mentioned one running parallel to respective weft courses and the remaining two of which are located on the other common side of the first mentioned window running parallel to respective weft courses.

Claim 25

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter is disposed in said lathe, said light receiver is disposed in the reed cap of the loom, said light receiver includes a cavitied casing and said weft image selector mechanism includes a lid disposed to the light receptive side end of said casing and having two windows, one of which is positioned on the side of the lid toward the reeds of the loom and the other of which is positioned on the cloth fell side of said lid.

Claim 26

Photoelectric type weft sensor as claimed in claim 23 wherein said discrimination circuit includes a discriminator connected to a photoelectric cell of said one window, a differential rectifier circuit connected to said discriminator via an integration circuit and a discriminator, a discriminator connected to a photoelectric cell of said cloth fell side window an inverter circuit connected to this discriminatoR, a gate circuit connected to this inverter circuit and to said first mentioned discriminator, a flip-flop circuit connected to this gate circuit and to said differential rectifier circuit a differential rectifier circuit connected to said second mentioned discriminator, an AND circuit connected to this differential rectifier circuit and said flip-flop circuit and said operation terminal connected to this AND circuit.

Claim 27

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter is disposed in the reed cap of the loom, said light receiver is disposed in said lathe, said light receiver includes a cavitied casing and said weft-image selector mechanism includes a lid disposed to the light receptive side end of said casing and having two windows, one of which is positioned on the side of the lid toward the reeds of the loom and the other of which is positioned on the cloth fell side of said lid.

Claim 28

Photoelectric type weft sensor as claimed in claim 25 wherein said discrimination circuit includes a discriminator connected to a photoelectric cell of said one window, a differential rectifier circuit connected to said discriminator via an integration circuit and a discriminator, a discriminator connected to a photoelectric cell of said cloth fell side window an inverter circuit connected to this discriminator, a gate circuit connected to this inverter circuit and to said first mentioned discriminator, a flip-flop circuit connected to this gate circuit and to said differential rectifier circuit a differential rectifier circuit connected to said second mentioned discriminator, an AND circuit connected to said differential rectifier circuit and said flip-flop circuit, and said operation terminal connected to this AND circuit.

Claim 29

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter includes a cylindrical casing fixed to a part of the loom, a convex lens disposed at the light emitting end of said casing, a cap inserted over said casing on the other side and a lamp carried by said cap with its filament being registered at the weft direction.

Claim 30

Photoelectric type weft sensor as claimed in claim 4 wherein said light emitter is fixed to the reed cap and said light receiver is movably mounted in a recess of the lathe.

Claim 31

Photoelectric type weft sensor as claimed in claim 28 wherein said light receiver is accompanied by an actuating mechanism and said light receiver moves forwardly out of said recess and rearwardly into said recess being actuated by the swing movement of the lathe via said actuating mechanism which includes a fixed cam and a cam follower roller connected to said light receiver.

Claim 32

Photoelectric type weft sensor as claimed in claim 28 wherein said light receiver is accompanied by an actuating mechanism and said light receiver moves forwardly out of said recess and rearwardly into said recess being actuated by the rotation of the tappet shaft via said actuating mechanism which includes an actuator cam, a slider and its related assembly accompanying said light receiver and a transmission mechanism between said cam and said assembly.