GB1186985A - Inspection Apparatus in Circular Knitting Machine. - Google Patents
Inspection Apparatus in Circular Knitting Machine.Info
- Publication number
- GB1186985A GB1186985A GB34979/68A GB3497968A GB1186985A GB 1186985 A GB1186985 A GB 1186985A GB 34979/68 A GB34979/68 A GB 34979/68A GB 3497968 A GB3497968 A GB 3497968A GB 1186985 A GB1186985 A GB 1186985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- needles
- pulses
- output
- broken
- trigger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
- D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
- D04B35/18—Indicating, warning, or safety devices, e.g. stop motions responsive to breakage, misplacement, or malfunctioning of knitting instruments
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Abstract
1,186,985. Semi-conductor circuits. ELECTRONIT Ltd. 22 July, 1968, No. 34979/68. Heading H3T. [Also in Divisions D1 and G1] Broken needles in a circular knitting machine are detected photo-electrically. Needles are carried in spaced groups of four round the periphery of the rotating drum of the circular knitting machine, and the apparatus is designed so as not to respond to the spaces between groups of needles. The photo-electric apparatus, Fig. 2 (not shown), comprises a light source (6), light guides (7 and 9), provided with reflectors at their ends, and a phototransistor detector (8). Needles (2) pass sequentially through the gap between the mirrors at the ends of the light guides and produce rounded pulses from the phototransistor due to obstruction of part of the light reaching the latter. A broken needle produces a rounded pulse of lower amplitude than the general constant amplitude of the pulses produced by unbroken needles, Fig. 4a (not shown). The output of the phototransistor is amplified by a limiting amplifier (transistors 17, 18, Fig. 3) producing a square wave output and applied to a transistor trigger circuit 19, 20. The level of the trigger is set such that only the presence of a needle (broken or unbroken) will cause triggering, a space between groups of needles therefore not causing triggering. The trigger circuit output is a series of rectangular negative-going pulses, Fig. 4b (not shown), of the same amplitude but if due to a broken needle, having a reduced width, this width depending on the magnitude of the break. The rest of the circuit is designed to detect which of these pulses are due to broken needles. Then the trigger output is differentiated by an R.C. network (including capacitor 23) and applied to a monostable circuit 25, 26. This acts as a reference pulse generator, producing positive going, constant width pulses, Fig. 4d (not shown), on receipt of each negative going spike. Its output is differentiated by a capacitor 33 and applied to the collector of a gate transistor 31. Applied to the base of this transistor 31 are the output pulses of trigger 19, 20, which when they occur cause the transistor to be non-conductive. Thus only when there is a short pulse from trigger 19, 20 due to a broken needle, is the negative going spike of a differentiated reference pulse allowed to pass through the gate to the output line 34. When this occurs an alarm lamp (10) is lit, an audible alarm sounded and the brake applied to the knitting machine. Also a counting circuit is started so that the number of pulses (needles) occurring after detection of a broken needle and until stopping of the machine, is counted and displayed on counting tubes 11. The tolerance of the apparatus is decided by the values of the circuit components used and particularly by the adjustment of a resistor 30 in the monostable circuit. This is normally adjusted so that the reference pulses produced are of equal length to the pulses from the detector for unbroken needles, and so the very narrow tolerance required for detection of broken needles is provided. If the output of the limiting amplifier is suitable to operate the pulse generator and gate directly, the trigger circuit may be omitted.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB34979/68A GB1186985A (en) | 1968-07-22 | 1968-07-22 | Inspection Apparatus in Circular Knitting Machine. |
US843005A US3577750A (en) | 1968-07-22 | 1969-07-18 | Inspection apparatus for circular knitting machines |
FR6924754A FR2013454A1 (en) | 1968-07-22 | 1969-07-21 | |
DE19691937246 DE1937246A1 (en) | 1968-07-22 | 1969-07-22 | Needle guard of a circular knitting machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB34979/68A GB1186985A (en) | 1968-07-22 | 1968-07-22 | Inspection Apparatus in Circular Knitting Machine. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1186985A true GB1186985A (en) | 1970-04-08 |
Family
ID=10372370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34979/68A Expired GB1186985A (en) | 1968-07-22 | 1968-07-22 | Inspection Apparatus in Circular Knitting Machine. |
Country Status (4)
Country | Link |
---|---|
US (1) | US3577750A (en) |
DE (1) | DE1937246A1 (en) |
FR (1) | FR2013454A1 (en) |
GB (1) | GB1186985A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993024691A1 (en) * | 1992-05-26 | 1993-12-09 | Microtex S.A.S. Di Dott. L. Michetti | Device for continuously monitoring the needles of a knitting machine during operation thereof |
CN104480627A (en) * | 2014-10-22 | 2015-04-01 | 常州市第八纺织机械有限公司 | Detection system of broken needle of weft-insert needle |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771325A (en) * | 1971-04-30 | 1973-11-13 | Rockwell International Corp | Element position detector system |
US3788105A (en) * | 1972-03-08 | 1974-01-29 | Sick Erwin Fa | Needle monitoring device for circular knitting machines |
GB1446172A (en) * | 1973-09-18 | 1976-08-18 | Venczel J | Detection of defective knitting needles of a knitting machine |
JPS5059562A (en) * | 1973-09-27 | 1975-05-22 | ||
ATE469256T1 (en) * | 2006-11-13 | 2010-06-15 | Memminger Iro Gmbh | METHOD AND DEVICE FOR NEEDLE MONITORING |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2165975A (en) * | 1934-10-20 | 1939-07-11 | Hemphill Co | Stop motion |
DE881718C (en) * | 1943-11-05 | 1953-07-02 | Schubert & Salzer Maschinen | Automatic parking device for loop-forming machines |
GB720382A (en) * | 1951-04-27 | 1954-12-15 | Raymonde Lebocey | Improvements in or relating to circular single or multi needle bed knitting machines |
US2760363A (en) * | 1951-07-30 | 1956-08-28 | Borg George W Corp | Defective needle spotter |
US2963890A (en) * | 1957-09-03 | 1960-12-13 | James M Hoots | Electrical stop motion for knitting machines |
-
1968
- 1968-07-22 GB GB34979/68A patent/GB1186985A/en not_active Expired
-
1969
- 1969-07-18 US US843005A patent/US3577750A/en not_active Expired - Lifetime
- 1969-07-21 FR FR6924754A patent/FR2013454A1/fr not_active Withdrawn
- 1969-07-22 DE DE19691937246 patent/DE1937246A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993024691A1 (en) * | 1992-05-26 | 1993-12-09 | Microtex S.A.S. Di Dott. L. Michetti | Device for continuously monitoring the needles of a knitting machine during operation thereof |
US5524460A (en) * | 1992-05-26 | 1996-06-11 | Microtex Sas Di Dott. L. Michetti | Device for continously monitoring the needles of a knitting machine during operation thereof |
CN104480627A (en) * | 2014-10-22 | 2015-04-01 | 常州市第八纺织机械有限公司 | Detection system of broken needle of weft-insert needle |
Also Published As
Publication number | Publication date |
---|---|
FR2013454A1 (en) | 1970-04-03 |
US3577750A (en) | 1971-05-04 |
DE1937246A1 (en) | 1970-07-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR890012236A (en) | Rapid signal validity inspection device | |
US4027982A (en) | Needle detector for circular knitting machines | |
SE7900767L (en) | METHODS AND APPARATUS FOR DETERMINING THE RANDOM COINCIDENCY FREQUENCY IN A SCINTILLATION RECORD IN WHICH THE COINCIDENCE TECHNIQUE IS USED | |
US3529445A (en) | Apparatus for controlling the operation of circular knitting machines | |
GB1412897A (en) | Switchable frequency tone filter and detector with high speed switching capability | |
GB1186985A (en) | Inspection Apparatus in Circular Knitting Machine. | |
US3786265A (en) | Apparatus for detecting defects in continuous traveling material | |
GB1254325A (en) | Apparatus for testing the continuity of photographic film | |
US3680047A (en) | Parametric integrator for condition-responsive systems | |
US3566348A (en) | Range measuring system | |
ES363669A1 (en) | Alarm device gas discharge tube | |
US4249081A (en) | Defect detection system | |
GB1222677A (en) | Method and circuit arrangement for setting the amplifying factor of a photo-multiplier | |
GB1303041A (en) | ||
US3717771A (en) | System for detecting defects in continuous traveling material | |
US4591708A (en) | High-intensity opto-electronic sensor having low power consumption | |
GB1011145A (en) | Improved scanner apparatus | |
US4266218A (en) | Alarm system control circuit | |
GB1242692A (en) | Yarn speed or yarn length measurement apparatus | |
ES449180A1 (en) | Radar, in particular for watching over premises | |
EP0067313A1 (en) | Smoke detector with a pulse-actuated radiation source | |
US3932767A (en) | Filter-discriminator circuit | |
GB981435A (en) | Apparatus for detecting faults in a web of paper | |
US3492490A (en) | Integrator circuit for security validation | |
JPS54107791A (en) | Radiation exposure detector |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |