US3307592A - Loom shedding mechanism - Google Patents
Loom shedding mechanism Download PDFInfo
- Publication number
- US3307592A US3307592A US479812A US47981265A US3307592A US 3307592 A US3307592 A US 3307592A US 479812 A US479812 A US 479812A US 47981265 A US47981265 A US 47981265A US 3307592 A US3307592 A US 3307592A
- Authority
- US
- United States
- Prior art keywords
- treadle
- lever
- loom
- arm
- cam
- 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 - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
- D03C5/02—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices operated by rotating cams
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C2700/00—Shedding mechanisms
- D03C2700/01—Shedding mechanisms using heald frames
- D03C2700/0105—Cam-driven heald frame movement
- D03C2700/0122—Devices for adjusting the geometric and time parameters of shed opening
Definitions
- the treadles are opened to form an angle directed toward the front'of the loom, while the warp threads must be opened in a shed directed toward the rear.
- FIG. 1 is an elevation of the mechanism as applied on a loom and viewed from the left-hand side;
- FIG. 2 is a horizontal section taken on line 22 in FIG. 3;
- FIG. 3 is a side elevation of the treadle unit
- FIG. 4 is a front elevation of the harness cam shaft shown partially in section.
- FIG. 5 is an elevation in perspective of the adjustable cam follower lever shown in exploded arrangement for the sake of clarity.
- FIGS. 1 and 4 two middle girts and 21 are shown in section only, it being understood that the mechanism disclosed herein is supported by and contained between these members.
- Bearing boxes 22 and 23 are fixed to the girts 20 and 21 to journal a shaft 24 for rotation.
- a gear 25 is keyed to the shaft 24 and both are to be driven at a predeterminedconstant speed by a gear train and a loom shaft (not shown) in a well-known manner.
- a series of harness cams 26 is fixed angularly about the shaft 24 for vertically reciprocating a series of harness frames 27.
- Six harness cams 26 are shown in FIG. 4 but this number may be more or less as determined by the number of harness frames required by the cloth construction to be woven.
- all harness cams 26 for a particular weave are identical whereas previously all cams in a set would of necessity differ in their angular rise and fall. This feature alone results in a greatly reduced inventory and corresponding reductions in costs.
- a rocking shaft 28 is fixedly supported between the middle girts 20 and 21 in a position parallel to and forwardly of the shaft 24. It is necessary that there be one treadle and one cam follower for each harness cam, but as these are identical, only one will be explained.
- a cam follower lever 29 is pivotally supported at its apex upon the shaft 28 (FIGS. 1 and 3). The lever 29 is of angular bell crank formation having one arm 30 upon which a cam follower roll 31 is attached and a second arm 32 for supporting the treadle, generally designated 33, to be explained fully below.
- the arm 30 has two sets of matching teeth 34 directed rearwardly when positioned in the loom for indexing a roll bracket 35 (FIG. 5).
- a pair of bracket teeth 36 on the back of the bracket 35 mate with the teeth 34 for adjusting the position of the bracket 35 longitudinally of the arm 30. Any fastening means such as a bolt 37 may be used to lock these two parts together.
- the bracket 35 extends rearwardly forming a yoke 38 which journals the roll 31 by its trunnion 39. It will be seen that the roll.31, which will be urged toward the rotating cam 26, will cause the lever 29 to oscillate forward and backward in response to the cam face (FIG. 1).
- the treadle 33 is shown having two parallel side panels, each panel being formed by a pair of sheet members 40.
- the sheet members 40 drawing the harness frame 27 to a low position.
- the side panels are rigidly interconnected by spacer bars 43 extending through each pair of collars 42 with a further welding operation added to secure the panels together.
- the treadle 33 is pivotally 'held at a point intermediate its ends by the arm 32 fixed to a bearing 44 held by an expandable roll pin 45 (FIG. 2).
- the forwardly extending end of the treadle 33 has a roller 46 journalled between the side panels on a roll pin 47.
- the roller 46 rests and rolls upon a generally horizontally disposed plate 48 which extends between the middle girts 20 and 21. It has been found that in certain instances a sliding end surface is advantageous in place of the roller 46. It is primarily desirable that the forward end of the treadle be supported for movement in a horizontal plane.
- the harness frames 27 may be connected with the treadles 33 under the treadle pins 41 by adjustable wire hooks 49 of any suitable type, of which many are available.
- a protective cover 50 may be secured above the forward ends of the treadles: extending between the middle girts 20 and 21.
- the lever 29 is pivoted forward and back in following the dictates of the cam 26.
- the treadle 33 is pivoted downwardly thus
- the lever 29 follows and allows the treadle 33 of to be drawn upwardly by any usual mechanism thereabove (not shown).
- FIG. 1 the extent of movement by the lever 29 and the treadle 33 is shown by means of the solid and dotted line illustration.
- the straight lines of treadle pins 41, in treadles which are up and in treadles which are down, form an angle to each other which equals that of the angle of warp shed in the frames 27 above. This angle may be changed when necessary for different shuttle sizes by simply adjusting the bracket 35 longitudinally along the arm 30.
- all the harness cams in a set are alike, all the treadles in that set will have an equal angular movement. This makes all the treadles interchangeable so that, as the treadle pins 41 wear, a treadle can be switched to another harness in a regular system of rotation.
- harness frames with this invention are drawn downwardly in a straighter path than was previously possible with treadles pivoting through an arc.
- Less sway in the harnesses results in less chafing of the yarn and a better finished product than was possible with earlier mechanism.
- Harness frame shedding means for looms which comprises a plurality of treadles, one for each frame, a cam shaft having cams rotatable therewith, one cam for each treadle, a cam follower lever for each treadle pivotally fixed forwardly of said cam shaft, a cam follower roll rotatably supported upon one end of said lever, a second end of said lever being secured intermediate the ends of said treadle for imparting pivotal motion thereto, a first end of said treadle extending rearwardly and having connecting means for said frames, and a second end of said treadle extending forwardly and being freely movable horizontally.
- Mechanism as defined in claim 1 which further includes means for adjustably positioning said fol-lower roll upon said cam follower lever.
- Harness frame shedding means for looms which comprises a plurality of treadles, a cam shaft having cams rotatable therewith, one cam for each treadle, a cam follower lever for each treadle pivotally fixed forwardly of said cam shaft, a cam follower roll adjustably positioned along one end of said lever for rotation thereon, a second end of said lever being secured intermediate the ends of said treadle for imparting pivotal motion thereto, a first end of said treadle extending rearwardly and being bifurcated thus forming two opposing side members, each of said side members having a plurality of connecting means for said harness frames, and a second end of said treadle extending forwardly being freely movable horizontally.
- Harness frame shedding means for loo-ms which comprises a plurality of identical treadles each including a pair of parallel side panels, said panels being rigidly connected in spaced apart relationship, a cam shaft having cams rotatable therewith, one cam for each treadle, a bell crank cam follower lever for each treadle pivotally fixed forwardly of said cam shaft, a cam follower member adjustably positioned longitudinally along one arm of said lever, a second-arm of said lever being secured intermediate the ends of said treadle for imparting pivotal motion thereto, a first end of said treadle extending rear- Wardly and having a plurality of connecting means for said harness frames, said cam follower member with said one arm together with that portion of said cam which is in contact with said follower member being adapted to pass between the said side panels at the said first end of said treadle, a second end of said treadle extending forwardly being freely movable horizontally, and a plate member securely fastened to support said second end for movement thereon.
- each one of said side panels includes a pair of vertically supported parallel sheet members, each said pair of sheet members being partially held in separation by one series of said treadle pins.
- a treadle for a loom having a bifurcated first end and a second end being adapted for generally horizontal movement, a pivotal point on said treadle intermediate said ends, two series of connecting means opposingly disposed on said bifurcated end for actuating a loom harness frame, an angular lever having a first arm attached to said treadle at said pivotal point, a cam follower fixed to a second arm of said lever, said cam follower and said second arm being adapted to oscillate through said bifurcated end, said lever being pivotally supported at its apex.
- the mechanism of claim 10 which further includes means for adjustably positioning said cam follower longitudinally of said second arm.
- treadle is comprised of a pair of parallel side panels rigidly connected in spaced apart relationship.
- each one of said side panels includes a pair of parallel sheet members, each said pair of sheet members being partially held in separation by a series of treadle pins.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US479812A US3307592A (en) | 1965-08-16 | 1965-08-16 | Loom shedding mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US479812A US3307592A (en) | 1965-08-16 | 1965-08-16 | Loom shedding mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US3307592A true US3307592A (en) | 1967-03-07 |
Family
ID=23905550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US479812A Expired - Lifetime US3307592A (en) | 1965-08-16 | 1965-08-16 | Loom shedding mechanism |
Country Status (1)
Country | Link |
---|---|
US (1) | US3307592A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739816A (en) * | 1970-04-28 | 1973-06-19 | Vyzk Ustav Bavlnarsky | Control apparatus for wave shed forming means |
US3866634A (en) * | 1973-05-05 | 1975-02-18 | Zinovy Yakovlevich Rutkevich | Shedding motion for loom |
-
1965
- 1965-08-16 US US479812A patent/US3307592A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739816A (en) * | 1970-04-28 | 1973-06-19 | Vyzk Ustav Bavlnarsky | Control apparatus for wave shed forming means |
US3866634A (en) * | 1973-05-05 | 1975-02-18 | Zinovy Yakovlevich Rutkevich | Shedding motion for loom |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DRAPER CORPORATION, Free format text: CHANGE OF NAME;ASSIGNOR:DELTA ACQUISITION CORPORATION,;REEL/FRAME:004097/0735 Effective date: 19820920 Owner name: DELTA ACQUISTION CORPORATION; HORNADAY RD., GREENS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROCKWELL INTERNATIONAL CORPORATION;REEL/FRAME:004113/0020 Effective date: 19820321 |
|
AS | Assignment |
Owner name: CITICORP INDUSTRIAL CREDIT INC., A CORP. OF DE Free format text: SECURITY INTEREST;ASSIGNOR:DRAPER CORPORATION A CORP. OF GA F/K/A DELTA ACQUISITION CORPORATION;REEL/FRAME:004070/0533 Effective date: 19821021 |
|
AS | Assignment |
Owner name: DRAPER CORPORATION, GREENSBORO, NORTH CAROLINA A C Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:004664/0583 Effective date: 19860331 |