US3488668A - Tenter clip - Google Patents

Tenter clip Download PDF

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Publication number
US3488668A
US3488668A US710037A US3488668DA US3488668A US 3488668 A US3488668 A US 3488668A US 710037 A US710037 A US 710037A US 3488668D A US3488668D A US 3488668DA US 3488668 A US3488668 A US 3488668A
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US
United States
Prior art keywords
jaw
jaws
gripping
stripping
sheet
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
Application number
US710037A
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English (en)
Inventor
Henry Stanislaus Wilczewski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3488668A publication Critical patent/US3488668A/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/20—Edge clamps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D06C3/02—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by endless chain or like apparatus
    • D06C3/04—Tentering clips

Definitions

  • the procedure is to grip the sheet with tenter clips at the sheet edges and by heating the sheet and moving the clips apart, stretch the sheet to the desired dimensions.
  • the gripping force of the clip be sufficient to firmly hold the sheet.
  • the sheet member Because of the forces needed to hold the sheet in the jaws and because of the deformable nature of many sheet members particularly when heated, there is a tendency for the sheet member to stick to one or both of the jaws of a clip when the clip is opened.
  • a bead is formed on the edge of the sheet member which prevents the sheet from slipping through the tenter clip jaws. The bead is positioned behind the jaws and may stick to the inner edge of the jaws because of the tension that is placed on the sheet member when it is stretched, forcing the bead onto the inner edge of the jaw.
  • the present invention provides a tenter clip which has a compact stripper construction and yet is effective in releasing a sheet member stuck to the clip jaws when the jaws are opened.
  • This tenter clip is simple to construct, is relatively inexpensive, and does not require continuous maintenance and lubrication to remain operative.
  • the tenter clip of the present invention is comprised of a pair of coacting movable jaws, each jaw having a web gripping surface and a pair of cooperating stripping members with a contact surface.
  • the stripping member of each jaw is attached to that jaw so that it moves when the jaw is moved.
  • the stripping members of each jaw are arranged so that when the jaws are closed, the stripping member of one jaw is immediately behind the opposite jaw.
  • the stripping member of one jaw moves behind the opposite jaw so that the plane of the contact surface of a stripping member moves into the plane of the gripping surface of the opposite jaw.
  • the stripping members move close enough to the jaws so that they can strip any bead or sheet member that is stuck to the jaw.
  • the present invention can be easily incorporated into existing tentering apparatus.
  • the jaw can be connected t0 a tentering chain by means of a bracket device or the jaw can be formed as part of a tentering chain link.
  • the jaws can be actuated remotely by providing extension arms on the respective jaws to allow them to be operated by cam trips or hydraulic or pneumatic devices.
  • the tlexibility of the present invention is illustrated by the fact that regardless of which jaw is operated, both jaws can be stripped by the respective stripping member of the opposite jaw. Therefore, either one or both of the jaws can be actuated, depending upon the design of the particular tentering device.
  • FIGURE 1 is a front view of a tenter clip incorporating a specific embodiment of the present invention.
  • FIGURE 2 is a side view of the tenter clip shown in FIGURE 1.
  • FIGURES 3 through 5 are side views of the tenter clip gripping and stripping a sheet member.
  • FIGURE 6 is a front view of an alternate embodiment of the present invention.
  • FIGURE 7 is a side view of FIGURE 6.
  • FIGURE 8 is a front view of another alternate embodiment of the present invention.
  • FIGURE 9 is a side view of FIGURE 8.
  • the trst or lower jaw 10 has hinge lugs 12 arranged in a row so that the pin or shaft bores 14 are coaxial.
  • FIGURE 2 shows the substantially U-shaped gripping means 16 radially extending from the outer periphery of the hinge lugs 12 at one end and the other end forming the sheet gripping surface 18.
  • the gripping means and the gripping surface extend along the length of the jaw.
  • a stripper member 20 extends radially from the periphery of each hinge lug 12 of the lower jaw 10. The radial extension of each stripper member is of sufficient length so that each stripper member moves closely to the inner surface 22 of the gripping surface 24 0f the upper or second jaw 26 when the jaws are actuated.
  • the upper or second jaw 26 has several hinge lugs 28 arranged in a row so that the shaft or pinholes 14 are coaxial.
  • a substantially U-shaped gripping means 30 radially extends from the outer periphery of the hinge lugs 28 at one end and extends along the length of the jaw 26. The other end of the U-shaped gripp-ing means 30 forms the gripping surface 24 which also extends along the length of the jaw 26.
  • a stripper member 32 radially extends from the outer periphery of the hinge lugs 28.
  • the stripper member 32 of the preferred embodiment is one continuous blade that extends along the length of the jaw 26, although an alternative embodiment could have one stripper member extending from each hinge lug.
  • the radial extension of the upper jaw stripper member 32 is of sufficient length so that the stripper member 32 moves closely to the inner surface 34 of the lower jaw 10 when the jaws are opened.
  • the hinge lugs 28 of the upper jaw 26 fit adjacent to or between and mesh with the hinge lugs 20 of the upper jaw 10.
  • the lugs of both jaws are coaxial and a pivot pin or hinge pin 36 is placed in the common bore 14 to hingedly or pivotally connect the jaws. Therefore, when the hinge lugs of the jaws are meshed and the pin put in the pin bore, the gripping surfaces of each jaw are opposite and adjacent to the gripping surface of the opposite jaw.
  • the jaws of the preferred embodiment are arranged so that when they are opened, the plane of the stripping member is in the same plane aS the gripping surface of the gripping means. Any beaded edge or accumulation of sheet material that extends over the inner edge of the gripping surface is thus engaged and stripped off by the stripping member. Sometimes the beaded edge or the sheet material sticks to the gripping surface of the upper jaw and on other occasions it sticks to the gripping surface of the lower jaw. In either event, however, the sheet is stripped from the gripping surface because each jaw has a cooperating stripping member which releases the sheet stuck to the opposite jaw when the jaw is opened.
  • FIGURE 3 shows a tenter clip gripping a sheet member.
  • FIGURE 4 shows the stripping member 20 of the lower jow stripping a beaded edge from the gripping surface 24 of the upper jaw 26.
  • FIGURE 5 shows the stripping member 32 of the upper jaw 26 stripping a beaded edge from the gripping surface 18 of the lower jaw 10. In both cases, the jaw is shown in the fully open position and the contact surface of the Stripping member is in the same plane as the gripping surface of the jaw.
  • the orientation on the hinge lugs of the stripping member of each jaw may be changed such that the contact surface of the stripping member of one jaw would move into and then through the plane of the gripping surface of the other jaw. In that manner any portion of a sheet or web that extends into the space behind the gripping means of the jaws is stripped from the jaw.
  • the preferred embodiment of the tenter clip has a bracket 66 attached to the lower jaw 10 and a cam trip arm 68 attached to the upper jaw 26.
  • the clip is bolted to a tentering chain through bolt holes 70 in the bracket 66.
  • the jaws are operated by means of a cam wheel which is fixed at the release end of the apparatus to intercept and trip the cam trip arm 68 thereby opening the jaws to release a film member.
  • FIG- URES 6 and 7 show a tenter clip comprising a pair of similar coacting jaws 38 hingedly or pivotally connected by a common pivot or hinge pin 40.
  • the jaws are assembled so that the hinge lugs 42 are meshed and a pivot pin 40 is placed in the common bore 49.
  • the tenter clip of this embodiment is similar to the preferred embodiment described above in that the gripping means 44 of each jaw extends from the outer periphery of the hinge lugs 42.
  • the portion of the grippingy means 44 that forms the gripping surface 48 is comprised of a plurality ofi alternately spaced gripping vlingers 47 each having its Own gripping surface 48 in a plane common to the gripping surfaces 48 of the same jaw.
  • the stripping means 46 of each jaw are comprised of a plurality of stripping members 46 which extend from the outer periphery of the hinge lugs 42. As shown in FIGURE 7 the stripping means 46 of each jaw are oriented such that each jaw has stripping means 46 which extend closely to the inner surface 52 of the gripping means 44 of the opposite jaw so that each gripping surface 48 is stripped by a separate stripping member 46. When the jaws are activated, the stripping .members 46 of one jaw move behind and adjacent to the inner surface 52 of the gripping means of the opposite jaw so that when the jaws are fully opened the contact surfaces 54 of the stripping members 46 of one jaw are in the plane common to the gripping surfaces 48 of the opposite jaw.
  • a web member held between the gripping surfaces of the tenter clip thus will be engaged by the surfaces 54 when the jaw is fully opened and released from the gripping surfaces 48.
  • the stripping members can be oriented such that the contact surface of the stripping member of one jaw moves into and beyond the plane common to the gripping surfaces of the other jaw.
  • the tenter clip shown in FIGURES 8 and 9 also has a pair of coacting jaws hingedly or pivotally connected together.
  • that portion of the gripping means 60 that forms the gripping surface 58 is ⁇ also comprised of a plurality of alternately spaced gripper fingers 56 each having its own gripping surface l58 in a plane common to gripping surfaces S8 of the same jaw.
  • the stripping means 62 of each jaw are comprised of a plurality of stripping members 62 which extend from the outer periphery of the hinge lugs 64. However, the stripping members 62 are positioned opposite the alternate spaces between the gripping fingers 56 of the opposite jaw.
  • the stripper members of one jaw move between the gripping means 60 of the opposite jaw until the contact surfaces 63 of the stripper member 62 of one jaw is in the same plane as the gripping sur- ⁇ faces 58 of the opposite jaw.
  • the stripper members can be oriented in relation to the gripping means such that when the jaws are opened, the stripper members of each jaw move into and beyond the plane of the grippingV surfaces of the opposite jaw.
  • the present tenter clip will be easily adaptable to a wide spectrum of tentering machines. Very few, if any, structural changes will have to be made to incorporate the tenter clip as part of a tentering chain.
  • the simple structure of the clip substantially reduces maintenance requirements and contamination hazards.
  • the positive release action of the clip makes it readily adaptable to automatic systems and the feature of both jaws having stripper members increases the reliability of the clip and reduces chances of damage to a fragile web member.
  • a tenter clip comprising:
  • a tenter clip for holding a sheet member, said tenter clip comprising a pair of coacting movable jaws, each jaw having a sheet member gripping surface and at least one cooperating stripping member which has a contact surface spaced from the gripping surface of the other jaw, each of said stripping members .moving with its respective jaw so that when the jaws are opened the plane of the contact surface of the stripping member of one jaw moves into the plane of the gripping surface of the other jaw to release the sheet member from the gripping surface.
  • each jaw has a plurality of coplanar spaced gripping surfaces and a plurality of coplanar stripping members which cooperate respectively with the gripping surfaces of the jaw and .move as a unit therewith.
  • a tenter clip according to claim 2 wherein said pair of coacting movable jaws comprises a rst and a second jaw, said first jaw having two spaced stripping members which have contact surfaces, said second jaw having one stripping member.
  • a tenter clip according to claim 6 wherein said first and second jaws are hingedly connected by means of hinge lugs having coaxial bores and a hinge pin fitted in said coaxial bores, said spaced stripping members of said first jaw protruding from the hinge lugs of the first jaw,
  • a tenter clip for holding a sheet comprising:
  • first and second coacting movable jaws each jaw having a substantially U-shaped profile with a sheet gripping surface on one leg of the U and at least one hinge lug having a bore formed on the other leg of the U; a hinge pin in such bores for interconnecting said jaws for pivotable movement about the pin; sheet stripping members arranged to cooperate with said jaws, the stripping member of each jaw being fixed at one end to the hinge lug of such jaw and extending to a position spaced from the gripping surface of such jaw, and having a sheet releasing contact surface closely adjacent to the gripping surface of the other jaw;

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Advancing Webs (AREA)
  • Coating Apparatus (AREA)
US710037A 1968-03-04 1968-03-04 Tenter clip Expired - Lifetime US3488668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71003768A 1968-03-04 1968-03-04

Publications (1)

Publication Number Publication Date
US3488668A true US3488668A (en) 1970-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US710037A Expired - Lifetime US3488668A (en) 1968-03-04 1968-03-04 Tenter clip

Country Status (4)

Country Link
US (1) US3488668A (enrdf_load_stackoverflow)
DE (1) DE1910513B2 (enrdf_load_stackoverflow)
FR (1) FR2003175A1 (enrdf_load_stackoverflow)
GB (1) GB1250116A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10131085B2 (en) * 2013-10-14 2018-11-20 Brückner Maschinenbau GmbH & Co. KG Clip transporting unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1706613A (en) * 1927-09-14 1929-03-26 Winsor & Jerauld Mfg Co Tenter clip
US1890449A (en) * 1931-07-22 1932-12-13 Berry William Clip for tentering machines and the like
US3104444A (en) * 1961-12-12 1963-09-24 Nash John Crandon Tenter clip gate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1706613A (en) * 1927-09-14 1929-03-26 Winsor & Jerauld Mfg Co Tenter clip
US1890449A (en) * 1931-07-22 1932-12-13 Berry William Clip for tentering machines and the like
US3104444A (en) * 1961-12-12 1963-09-24 Nash John Crandon Tenter clip gate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10131085B2 (en) * 2013-10-14 2018-11-20 Brückner Maschinenbau GmbH & Co. KG Clip transporting unit

Also Published As

Publication number Publication date
DE1910513B2 (de) 1971-08-19
FR2003175A1 (enrdf_load_stackoverflow) 1969-11-07
DE1910513A1 (de) 1969-09-18
GB1250116A (enrdf_load_stackoverflow) 1971-10-20

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