US3929172A - Package strapping tool - Google Patents

Package strapping tool Download PDF

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Publication number
US3929172A
US3929172A US476446A US47644674A US3929172A US 3929172 A US3929172 A US 3929172A US 476446 A US476446 A US 476446A US 47644674 A US47644674 A US 47644674A US 3929172 A US3929172 A US 3929172A
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US
United States
Prior art keywords
strapping
jointing
rotary dog
fluid pressure
loop
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
US476446A
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English (en)
Inventor
Robert David Sansum
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.)
Gerrard Industries Ltd
Original Assignee
Gerrard Industries Ltd
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 Gerrard Industries Ltd filed Critical Gerrard Industries Ltd
Application granted granted Critical
Publication of US3929172A publication Critical patent/US3929172A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B13/00—Bundling articles
    • B65B13/02—Applying and securing binding material around articles or groups of articles, e.g. using strings, wires, strips, bands or tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/185—Details of tools

Definitions

  • ABSTRACT 1 In a strapping tool of the kind in which a knurled rotary dog is urged into frictional engagement with the [30] Forelgn Application Pnomy Data face of one end of a loop of metal strapping and ro- May 3], United t t d t the loops around a package overlap.
  • PACKAGE STRAPPING TOOL This invention relates to strapping tools of the kind comprising jointing means for securing together the overlapping ends of a loop of strapping which has been tightened around a package and tensioning means including a knurled rotary dog which is urged into frictional engagement with the face of one end of the loop of strapping and rotated to tension the loop.
  • tensioning means including a knurled rotary dog which is urged into frictional engagement with the face of one end of the loop of strapping and rotated to tension the loop.
  • Some strapping tools of the kind defined are entirely hand-operated, others are entirely power-operated, usually pneumatically or hydraulically. Still others are operated partly by hand and partly by power.
  • the tensioning means is sometimes poweroperated but the means for making the joint securing together the overlapping ends of the joint is operated by hand or, alternatively, the tensioning means is handoperated and the jointing means power-operated.
  • the present invention consists in a strapping tool of the kind defined comprising sensing means, responsive to bodily movement of the rotary dog having at least a component in a direction normal to the strapping and towards a support on the far side of the strapping, for initiating or permitting the making of the joint by the jointing means when such movement exceeds a predetermined amount.
  • the bodily movement of the rotary dog is indicative of the force with which the rotary dog is urged against the strapping and, usually, of the depth to which the knurling of the rotary dog has penetrated the strapping.
  • this movement normal to the strapping is a function of the tension applied to the strapping since the higher the tension in the strap produced by friction between the rotaty dog and the strapping, the greater must be the force normal to the strapping to produce the frictional force and the greater the resulting compression or penetration of the strapping.
  • the sensing means may actuate a valve or switch to initiate the making of the joint by power-operated jointing means or it may release a catch or interlock otherwise preventing the use of a power or manuallyoperated jointing means.
  • the support will usually be rigid with the body of the tool but this is not essential. It may directly engage the far side of the end of the loop of strapping which is engaged on the near side by the rotary dog or it may be on the far side of the more remote of the overlapping ends of the loop.
  • a pressure plate may be interposed between the overlapping ends of the loop at the position where they are gripped between the rotary dog and the support. Alternatively the overlapping ends may be in direct contact with one another.
  • the rotary dog is carried by an angularly movable arm affording movement of the rotational axis of the rotary dog mainly towards and away from the strapping and it is the angular movement of the arm to which the sensing means is responsive.
  • the sensing means comprises a lever which is picked up by the arm after a pre-determined angular 2 movement and moved to initiate or permit the operation of the jointing means.
  • the sensing means preferably includes means for amplifying the small movement due to compression or penetration of the strapping to facilitate initiation of the operation of the jointing mechanism or the release of means preventing its operation.
  • FIG. 1 is a front elevation
  • FIG. 2 is an end elevation
  • FIG. 3 is an enlarged view, partly in section, of part of FIG. 1, and
  • FIG. 4 is a sectioned view on line 44 of FIG. 1.
  • the strapping tool illustrated. in the drawings is based on that described in British P'atent Specification No. 1,331,221 and comprises a body, including a base plate 1 and a housing 2 for jointing means in the form of a punch and die assembly 3, a pneumatic ram assembly 4 for operating the punch and die assembly 3, an air motor assembly 5 for tensioning a metal strap 6 to be fastened around a package, and a control valve assembly 7 by which the operation of the strapping tool is controlled.
  • the jointing means produces ajoint of the seal-less type in overlapped portions of metal band strapping.
  • the air motor assembly 5 comprises an air motor 8 which drives a knurled wheel or rotary dog 9.
  • the rotary dog 9 is disposed over a pressure plate 10 which is secured to and lies over the base plate 1 against which it is urged by spring means.
  • a catch (not shown) released by an arm 34 (FIG. 2).
  • the air motor assembly 5 is pivotally connected to the housing 2 about a pivot 11 so that the rotary dog 9 is movable towards and away from the pressure plate 10.
  • An outrigger bracket 12 is also pivoted about the pivot '11 and has an outer bearing for supporting the rotary dog 9.
  • An auxiliary ram assembly 13 having a piston rod 14 is pressurised whenever compressed air is applied to the air motor assembly 5 and the piston rod 14 urges the air motor assembly 5 about its pivot 11 so that the rotary dog 9 is forced towards engagement with the pressure plate 10.
  • the control valve assembly 7 comprises spool valves 15 and 16 (FIG. 4). Both valves are normally closed.
  • the valve 15 is the tension valve. It controls the air supply to the air motor assembly 5 and the auxiliary ram assembly 13 and is openable by depressing a tension valve lever 17.
  • the valve 16 is the jointing valve and controls the air supply to the pneumatic ram assembly 4.
  • the valve 16 is actuated by a piston 18 in a. slave cylinder 19.
  • the piston 18 carries a pin 20 which projects through a slot in the wall of the slave cylinder to bear on the tension valve lever 17 and hold it depressed when the piston 18 moves down.
  • the free upper end of the arm 22 carries an adjusting screw 23 the tip 33 of which, as best seen in FIG. 3, is in line with one end of a poppet valve spool 24 slidable in a chamber 25 in the housing 2 and controlling the supply of air to the slave cylinder 19.
  • the shoulder 21 is much nearer the pivotal axis of the arm 22 than is the adjusting screw 23 so that bodily move- 3 ment of the rotary dog 9 occurring after engagement of the extension. 35 with the shoulder 21 is amplified.
  • the arm 22 and screw 23 constitute sensing means responsive to bodily movement of the rotary dog 9.
  • the air supply reaches the chamber 25 by an inlet port 26.
  • the spool 24 is spring biased to urge a disc 28 onto a seating around the inner end of the chamber 25 so preventing air from passing to outlet ports 29 open to a passage 30 leading to the top of the slave cylinder 19.
  • the spool 24 has a central bore 31 open at the inner end through a port 36 to that part of the chamber from which the outlet ports 29 open.
  • the outer end of the bore 31 is open to the atmosphere and forms an exhaust port.
  • Around the outer end of the bore 31 is an annular seal 32 against which the tip 33 of the adjusting screw 23 bears to close the bore 31 and move the spool 24.
  • the spool valve 24 constitutes a pilot valve of an auxiliary fluid-pressure system including the slave cylinder 19 and piston 18 actuating a main valve formed by the valve 16.
  • the free end of a length of strapping 6 is clamped between the pressure plate and the base plate 1 with the strapping extending to the left, as viewed in FIG. 1.
  • the strapping is formed into a loop around the package and the other end of the loop is inserted between the rotary dog 9 and the pressure plate 10.
  • the rotary dog 9 is then released by operation of the arm 34 (FIG. 2) to clamp the strapping against the pressure plate 10.
  • the air motor 8 rotates the rotary dog 9 clockwise to draw in the loop of strapping around the package.
  • the auxiliary ram 13 urges the rotary dog 9 against the strapping with greater force as the tension in the strapping causes greater resistance to the driving force of the air motor 8 with a consequent rise in the air pressure at the air inlet to the tool.
  • the air motor 8 stalls and at this maximum air pressure the force with which the rotary dog 9 bears on the strapping is at its greatest.
  • the rotary dog 9 rotates freely (since there is no longer any tension in the strap) the air pressure on the auxiliary ram assembly 13 falls allowing the rotary dog 9 to rise.
  • the adjusting screw 23 moves to the left (as viewed in FIGS. 1 and 3) and is followed by the spool 24 until the disc 28 seats shutting off the air supply.
  • the tip 33 of the adjusting screw 23 moves away from the end of the spool 9 opening the end of the bore 31 to allow air to 4 escape from the slave cylinder 19 and its piston 18 to return to its starting position.
  • the tool relies upon the depth of penetration or compression of the rotary dog 9 into the strapping rather than a rise of air pressure to initiate the operation of the jointing mechanism, by proper adjustment the tool can be arranged to make the joint only after the air motor has stalled. This is desirable to allow time for the package and strap to consolidate with consequent smaller variations in tensions between packages.
  • a strapping tool of the kind comprising jointing means for securing together the overlapping ends of a loop of strapping which has been tightened around a package and tensioning means including a rotary dog and a support opposite the rotary dog, in use at least one end of a loop of strapping being disposed between the rotary dog and the support, the rotary dog being urged into frictional engagement with the face of said one end of the loop of strapping and rotated to tension the loop wherein the strapping tool further comprises sensing means responsive to bodily movement of the rotary dog having at least a component in a direction normal to the strapping and towards the support, for initiating or permitting the making of the joint by the jointing means when such movement exceeds a predetermined amount.
  • a strapping tool according to claim 1 wherein the rotary dog is carried by an angularly movable arm affording movement of the rotational axis of the rotary dog mainly towards and away from the strapping, the sensing means being responsive to the angular movement of the arm.
  • a strapping tool according to claim 2 wherein the sensing means comprises a lever which is picked up by the arm after a pre-determined angular movement of the arm and moved to initiate or permit the operation of the jointing means.
  • sensing means includes means for amplifying the small movement due to compression or penetration of the strapping to facilitate initiation of the operation of the jointing means or the release of means preventing its operation.
  • a strapping tool according to claim 1 and further comprising fluid pressure means for operating the jointing means and including a main valve and an auxiliary fluid pressure system actuating the main valve, the auxiliary fluid pressure system including a pilot valve actuated by the sensing means.
  • auxiliary fluid-pressure system includes a slave piston and cylinder assembly for actuating the main valve.
  • a strapping tool comprising a fluid pressure motor driving the rotary dog, a fluidpressure means for operating the jointing means and a manual control governing the admission of fluid pressure to the motor, means being provided for maintaining the admission of fluid pressure to the motor if actuation of the manual control is discontinued after initiation of the operation of the jointing means by the sensing means.
  • pilot valve is a spool valve having an exhaust port at one end closable by part of the sensing means by which the spool valve is also movable axially to cause the auxiliary fluid-pressure system to actuate the main valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Sheet Holders (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Surgical Instruments (AREA)
US476446A 1973-05-31 1974-06-05 Package strapping tool Expired - Lifetime US3929172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2607673A GB1423688A (en) 1973-05-31 1973-05-31 Package strapping tool

Publications (1)

Publication Number Publication Date
US3929172A true US3929172A (en) 1975-12-30

Family

ID=10237969

Family Applications (1)

Application Number Title Priority Date Filing Date
US476446A Expired - Lifetime US3929172A (en) 1973-05-31 1974-06-05 Package strapping tool

Country Status (19)

Country Link
US (1) US3929172A (de)
JP (1) JPS5027692A (de)
AT (1) AT352016B (de)
BE (1) BE815656A (de)
CA (1) CA996854A (de)
CH (1) CH577411A5 (de)
CS (1) CS190426B2 (de)
DE (1) DE2426423C3 (de)
DK (1) DK292374A (de)
ES (1) ES426793A1 (de)
FI (1) FI56346C (de)
FR (1) FR2231568B1 (de)
GB (1) GB1423688A (de)
IT (1) IT1018680B (de)
NL (1) NL7407440A (de)
NO (1) NO139318C (de)
RO (1) RO78270A (de)
SE (1) SE406573B (de)
ZA (1) ZA743491B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159725A (en) * 1976-12-03 1979-07-03 Borbe-Wanner Ag. Apparatus for tensioning and locking hooping bands
US5129210A (en) * 1991-06-03 1992-07-14 General Motors Corporation Clamping and cut-off apparatus for a banding strap

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965119U (de) * 1972-09-19 1974-06-07
JPS49128264A (de) * 1973-04-12 1974-12-09
JPS51108519A (ja) * 1975-03-19 1976-09-25 Hitachi Ltd Katsusensobatsukanona puraguin patsukeeji
JPS51108520A (ja) * 1975-03-19 1976-09-25 Hitachi Ltd Katsusensobatsukanona puraguin patsukeeji
JPS5931240B2 (ja) * 1975-07-21 1984-07-31 大倉電気株式会社 オンラインで着脱可能な電子回路基板
JPS5264516U (de) * 1975-11-07 1977-05-12
JPS52115847U (de) * 1976-03-01 1977-09-02
JPS5364247U (de) * 1976-11-04 1978-05-30
JPS5377342U (de) * 1976-12-01 1978-06-28
JPS5399558U (de) * 1977-01-17 1978-08-11
JPS5436051U (de) * 1977-08-16 1979-03-09
JPS5486392U (de) * 1977-11-30 1979-06-19
DK214079A (da) * 1978-05-25 1979-11-26 Gerrard Ind Ltd Emballageombindingsvaerktoej
JPS5538411U (de) * 1978-09-04 1980-03-12
JPS5827509Y2 (ja) * 1978-10-11 1983-06-15 株式会社日立製作所 接続機構
DE3051121C2 (de) * 1979-10-10 1995-03-09 Signode Corp Greifvorrichtung zum Festlegen des Vorderendes eines Umreifungsbandes in einem Umschnürungsgerät
US4282907A (en) * 1979-10-10 1981-08-11 Signode Corporation Tension sensing mechanism for strapping tool
US4289175A (en) * 1979-11-13 1981-09-15 Signode Corporation Tension sensing mechanism for power-operated push-type strapping and sealing tool
JPS5891886U (ja) * 1981-12-17 1983-06-21 松下電器産業株式会社 接続装置
JPS58183700U (ja) * 1982-06-01 1983-12-07 富士通株式会社 バブルメモリカセツトのホルダ−ユニツト
JPS58193398U (ja) * 1982-06-16 1983-12-22 富士通株式会社 磁気バブルメモリカセツト
JPS6090781U (ja) * 1983-11-26 1985-06-21 ミノルタ株式会社 基板コネクタ機構
JPS61142379U (de) * 1985-02-26 1986-09-03
JPS61294592A (ja) * 1985-06-21 1986-12-25 Sankyo Seiki Mfg Co Ltd Ｉｃカ−ドリ−ダ
JPS6243476U (de) * 1985-09-03 1987-03-16
JPS6290171U (de) * 1985-11-28 1987-06-09
JPH046142Y2 (de) * 1986-09-18 1992-02-20
JPH0254878A (ja) * 1988-08-20 1990-02-23 Fujitsu General Ltd Ｉｃカートリッジ等の電極配列パターン
JP2639364B2 (ja) * 1994-12-26 1997-08-13 日本電気株式会社 コネクタ
GB9511049D0 (en) * 1995-06-01 1995-07-26 Signode Plc Strapping tool
US6260337B1 (en) * 1999-10-27 2001-07-17 Illinois Tool Works Inc. Hand strapping tool
CN117602167B (zh) * 2024-01-24 2024-04-30 济南玖延机械有限公司 一种中药煎液包装机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391996A (en) * 1942-06-15 1946-01-01 Hydraulie Dev Corp Inc Control mechanism
US2545051A (en) * 1947-12-04 1951-03-13 Stearns Mfg Company Power control for fluid motors
US2682150A (en) * 1952-06-27 1954-06-29 Ballinger Lewis John Howell Fluid pressure system for sequentially operated fluid pressure motors
US3506041A (en) * 1968-06-03 1970-04-14 Signode Corp Pneumatic sealing control system for strapping machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687059A (en) * 1970-10-05 1972-08-29 Interlake Inc Strapping machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391996A (en) * 1942-06-15 1946-01-01 Hydraulie Dev Corp Inc Control mechanism
US2545051A (en) * 1947-12-04 1951-03-13 Stearns Mfg Company Power control for fluid motors
US2682150A (en) * 1952-06-27 1954-06-29 Ballinger Lewis John Howell Fluid pressure system for sequentially operated fluid pressure motors
US3506041A (en) * 1968-06-03 1970-04-14 Signode Corp Pneumatic sealing control system for strapping machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159725A (en) * 1976-12-03 1979-07-03 Borbe-Wanner Ag. Apparatus for tensioning and locking hooping bands
US5129210A (en) * 1991-06-03 1992-07-14 General Motors Corporation Clamping and cut-off apparatus for a banding strap

Also Published As

Publication number Publication date
BE815656A (fr) 1974-09-16
CS190426B2 (en) 1979-05-31
DK292374A (de) 1975-01-13
FI166374A (de) 1974-12-01
RO78270A (ro) 1982-04-12
NL7407440A (de) 1974-12-03
IT1018680B (it) 1977-10-20
CH577411A5 (de) 1976-07-15
NO741901L (no) 1974-12-03
AT352016B (de) 1979-08-27
FR2231568A1 (de) 1974-12-27
DE2426423C3 (de) 1980-10-23
FI56346C (fi) 1980-01-10
DE2426423B2 (de) 1980-02-28
FR2231568B1 (de) 1978-07-07
DE2426423A1 (de) 1974-12-19
JPS5027692A (de) 1975-03-20
GB1423688A (en) 1976-02-04
FI56346B (fi) 1979-09-28
SE7407195L (sv) 1974-12-02
ATA449974A (de) 1979-01-15
CA996854A (en) 1976-09-14
NO139318C (no) 1979-02-14
NO139318B (no) 1978-11-06
SE406573B (sv) 1979-02-19
ZA743491B (en) 1975-05-28
ES426793A1 (es) 1976-07-16

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