US3565121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weft selecting and presenting apparatus
Assignee: Elitex Zavody Textilniho
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Filing: 1969-06-02
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Granted: 1971-02-23
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Expires: 1989-06-02
Abstract
Abstract Several differently colored weft threads are fed through brake means and tensioning means to a gripper shuttle in an order determined by a pattern. Only the selected thread is clamped by the brake means and tensioned by the tensioning means during insertion into the gripper shuttle, and after the pick of the shuttle, while untensioned and unclamped thread is fed to the gripper shuttle during weft insertion. The nonselected threads remain untensioned and are not clamped, but slightly braked and are guided in accordance with the movement of the woven fabric.
Inventors
- 👤 Vladimir Svaty
- 👤 Jiri Zlathohlavek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
D; D03; D03D; D03D47/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
363 words
Weft selecting and presenting apParatus for a gripper shuttle, comprising, in combination, a unit including a threadguiding element having a first guide portion and being movable between a normal position and inserting and guiding positions for inserting a weft thread into said gripper shuttle and for guiding the thread to the same, tensioning means including a tensioning member having a second guide portion for said thread and being pivotably mounted on said guiding element movable between a tensioning and an untensioning position, and a tensioning spring connecting said tensioning member with said thread guiding element; comprising means limiting the movement of said tensioning member in two spaced positions of said thread guiding element, and releasing said tensioning member in intermediate positions of said guiding element; brake means having a third guide portion for said thread and being movable between a normal position, and a clamping position for clamping said thread, and thread supply means for supplying said thread to said brake means, said thread extending in said normal position through said first, second, and third guide portions from a weft thread inserted by said gripper shuttle to said supply means, said brake means including an electromagnetic brake and a brake switch for moving said electromagnetic brake to said clamping position; and operating means for moving said feeding element between said normal, inserting and guiding positions, said tensioning means between said tensioning and untensioning positions, and said brake means between said normal and clamping positions in synchronism with the operations of said gripper shuttle so that tensioned clamped thread is inserted by said guiding element into the gripper shuttle, so that untensioned unclamped thread is fed to said gripper shuttle during weft insertion, and so that the thread is tensioned and clamped at the end of a weft insertion, said operating means including a reciprocable operating member for reciprocating said thread guiding element with said tensioning member and said tensioning spring, and engaging and actuating said brake switch while said tensioning member is in said intermediate positions so that said brake is placed in said clamping position and said tensioning spring moves said tensioning member to said tensioning position while said thread is clamped.
Claim 2
Dependent Claim
363 words
Weft selecting and presenting apParatus for a gripper shuttle, comprising, in combination, a unit including a threadguiding element having a first guide portion and being movable between a normal position and inserting and guiding positions for inserting a weft thread into said gripper shuttle and for guiding the thread to the same, tensioning means including a tensioning member having a second guide portion for said thread and being pivotably mounted on said guiding element movable between a tensioning and an untensioning position, and a tensioning spring connecting said tensioning member with said thread guiding element; comprising means limiting the movement of said tensioning member in two spaced positions of said thread guiding element, and releasing said tensioning member in intermediate positions of said guiding element; brake means having a third guide portion for said thread and being movable between a normal position, and a clamping position for clamping said thread, and thread supply means for supplying said thread to said brake means, said thread extending in said normal position through said first, second, and third guide portions from a weft thread inserted by said gripper shuttle to said supply means, said brake means including an electromagnetic brake and a brake switch for moving said electromagnetic brake to said clamping position; and operating means for moving said feeding element between said normal, inserting and guiding positions, said tensioning means between said tensioning and untensioning positions, and said brake means between said normal and clamping positions in synchronism with the operations of said gripper shuttle so that tensioned clamped thread is inserted by said guiding element into the gripper shuttle, so that untensioned unclamped thread is fed to said gripper shuttle during weft insertion, and so that the thread is tensioned and clamped at the end of a weft insertion, said operating means including a reciprocable operating member for reciprocating said thread guiding element with said tensioning member and said tensioning spring, and engaging and actuating said brake switch while said tensioning member is in said intermediate positions so that said brake is placed in said clamping position and said tensioning spring moves said tensioning member to said tensioning position while said thread is clamped.
Claim 3
Dependent Claim
103 words
Apparatus as claimed in claim 1 comprising a plurality of said feeding units, each unit including a thread guiding element, tensioning means, brake means, thread supply means, and coupling means for coupling a selected one of said units with said operating means; and selector means for selecting and actuating one of said coupling means so that said feeding element of the selected unit is reciprocated by said operating means between said normal and inserting and feeding positions for inserting the respective thread into said gripper shuttle; and wherein said thread supply means of different units supply different threads to said feeding elements, respectively.
Claim 4
Dependent Claim
98 words
Apparatus as claimed in claim 2 wherein each tensioning means includes a tensioning member having said second guide portion and being pivotally mounted on said thread guiding element, and a tensioning spring connecting said tensioning member with said element; wherein said operating means include a reciprocable operating member coupled by said coupling means with said element of the selected unit for reciprocating the respective element with said tensioning member and said tensioning spring; and comprising two stop means for engaging said tensioning member in two spaced positions of said element, and releasing said tensioning member in intermediate positions.
Claim 5
Dependent Claim
88 words
Apparatus as claimed in claim 3 and comprising a cam lever connected with said brake switch for operating the same, and being engaged and angularly displaced by said operating member, said cam lever having a center portion and two slanted end portions, and being pivotally mounted at one end, and a spring connected to the other end of Said cam lever for urging the same against said operating member, said brake switch being operated only when said operating member cooperates with said central portion of said cam lever.
Claim 6
Dependent Claim
157 words
Apparatus as claimed in claim 4 wherein said coupling means of each feeding unit includes a coupling pawl mounted on the respective feeding element for pivotal movement between an inoperative position and a coupling position coupled with said operating member, and a spring biassing said coupling pawl toward said inoperative position; and wherein said selector means include a selector electromagnet and a program controlled selector switch in the circuit of said selector electromagnet so that when anyone of said selector switches is operated in accordance with a program, the selector electromagnet of the respective unit is energized and operates said coupling pawl to move to said coupling position so that reciprocation of said operating member in one direction effects movement of said thread guiding element toward said inserting and guiding positions, said element having a projection engaged by said operating member during return movement of the same so that said element is moved to said normal position.
Claim 7
Dependent Claim
85 words
Apparatus as claimed in claim 3 wherein said electromagnetic brake means includes a stationary brake member and a movable brake member, and a spring biassing said movable brake member toward said stationary brake member in said normal position so that the thread between said brake members is braked, and wherein said electromagnetic brake means, when energized upon actuation of said brake switch, attracts said movable brake member to abut said stationary brake member with a great force for clamping the thread between said brake members.
Claim 8
Dependent Claim
79 words
Apparatus as claimed in claim 3 wherein said operating means include a drive shaft; comprising a motor for driving said drive shaft, and means for stopping said motor including a stop motion switch; and wherein said tensioning member is moved by said tensioning spring to a position actuating said stop motion switch when the thread breaks while said brake means is in said clamping position, and said tensioning member is in said intermediate position spaced from said stop means.
References Cited (Backward Citations)
US3347283A
Cited
US3315707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |