US3847030A - Apparatus for regulating the drive of a press or the like - Google Patents

Apparatus for regulating the drive of a press or the like Download PDF

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Publication number
US3847030A
US3847030A US00340059A US34005973A US3847030A US 3847030 A US3847030 A US 3847030A US 00340059 A US00340059 A US 00340059A US 34005973 A US34005973 A US 34005973A US 3847030 A US3847030 A US 3847030A
Authority
US
United States
Prior art keywords
chain
press
fluid
valve
cylinder
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
US00340059A
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English (en)
Inventor
W Grutter
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.)
Bobst Mex SA
Original Assignee
J Bobst et Fils SA
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 J Bobst et Fils SA filed Critical J Bobst et Fils SA
Application granted granted Critical
Publication of US3847030A publication Critical patent/US3847030A/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
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
    • B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
    • B65H29/042—Intermediate conveyors, e.g. transferring devices
    • B65H29/044—Intermediate conveyors, e.g. transferring devices conveying through a machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/449—Features of movement or transforming movement of handled material
    • B65H2301/4493—Features of movement or transforming movement of handled material intermittent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/30—Chains
    • B65H2404/34—Gripper bars bridging at least two chains running synchronously and parallely
    • B65H2404/341—Details of driving or return drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/176—Cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/176—Cardboard
    • B65H2701/1762—Corrugated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/42—Die-cutting

Definitions

  • ABSTRACT The drive chains which are operative to intermittently move a series of gripper bars for conveying sheets through a printing press or the like each pass around a sprocket which is supported for movement in a direction aligned with the path of travel of the sheets.
  • the present invention relates to a printing press or the like and more particularly to a press employing a plurality of drive chains for conveying sheets, secured thereto by a plurality of gripper bars, through the press.
  • springs are employed to maintain tension on the drive chains.
  • the springs are compressed in order to slacken the chains when a sheet is held in fixed position either just prior to initial gripping by the gripping bar, or just prior to printing, cutting or the like.
  • the gripper bars may be fastened to the drive chains by means of couplings which are effective to momentarily disconnect the gripper bars from the chains when the gripper bar is to be indexed. This is described in Swiss Patent No. 466,690.
  • Another object of the present invention is to provide a drive mechanism for a printing press which does not employ springs for controlling the tension of the drive chains.
  • a pair of hydraulic pistons are provided for tensioning the drive chains, and a device is provided for supplying a quantity of hydraulic fluid to a cylinder housing such piston, so that a constant tension is applied to the chains irrespective of the length thereof or whether a portion of the chains are stopped for indexing.
  • FIG. I is a perspective view of a portion of a printing press incorporating an illustrative embodiment of the present invention.
  • FIG. 2 is a perspective view of a portion of a printing press incorporating an alternative embodiment of the present invention.
  • FIG. 1 there is shown spaced parallel upright frame plates 3 and 4 which support the drive chain assembly, including a pair of endless chains 1 and 2. No indexing, printing or cutting apparatus is shown in FIG. 1, but it is understood that conventional apparatus is associated with the drive chains 1 and 2 for accomplishing those functions.
  • a plurality of gripper bars 5 have their ends interconnected to the chains 1 and 2, respectively, and the gripper bars are supported by the chains and pulled by the chains in the direction of the arrow A.
  • the gripper bars 5 are removably secured to the chains 1 and 2 by means, for example, such as described in Swiss Patent No. 466,690.
  • the chain 1 passes around a sprocket 6, mounted on a shaft 8, and the chain 2 passes around a sprocket 7, also mounted on the shaft 8.
  • the ends of the shaft 8 are journalled in a pair of the bearings 9 and 10, which are adjustably supported by frame plates 3 and 4 by means not shown.
  • a pair of hydraulic cylinders 11 and 12 are each provided with a piston for urging the bearings 9 and 10 leftwardly as seen in FIG. 1. Movement of the pistons within the cylinders 11 and 12 effects a movement of the bearings 9 and 10 in a direction aligned with the direction of the arrow A, serving to place the chains 1 and 2 under a tension proportional to the hydraulic pressure.
  • the interiors of the cylinders 11 and 12 are connected via lines 13a and 13b with the outlet of a check valve 14, the inlet of which is connected over a line 13 to the outlet of a pump 17.
  • the inlet of the pump 17 is connected with a reservoir 18, which serves as a source of fluid for the pump.
  • a pressure gauge 15 indicates the pressure of the hydraulic fluid in the line 13.
  • a pressure reducer 16, connected between the outlet of the pump 17 and the reservoir 18, is provided for maintaining a constant pressure of fluid on the line 13. Fluid drawn by the pump 17 from the reservoir 18 circulates through the pressure reducer l6 and'back to the reservoir, maintaining a ready source of pressurized fluid at a constant pressure on the line 13.
  • the pressure reducer 16 is manually adjustable so that the pressure in the line 13 may be selected to be any desired value.
  • Each of the lines 13a and 13b is provided with a drain cock, l9 and 20 respectively, by which the air trapped in the hydraulic lines may be bled out of the system.
  • the pump 17 which is also preferably used for lubricating the various moving parts of the machine, delivers oil under pressure into the line 13, thus compensating for any losses of fluid from the cylinders 11 and 12 which may have occurred during the rest period, and forcing the pistons within the cylinders 11 and 12 leftwardly to place the chains 1 and 2 under tension.
  • the tension in the chains 1 and 2 is directly related to the pressure on the line 13, irrespective of the length of the chains. In this way, the tension on the chains is maintained at a constant value, proportional to the pressure of the fluid in the line 13.
  • the tension of the chains 1 and 2 can be increased by manipulation of the pressure reducer 16, to accommodate the increased loads on the chain and to avoid hammering of the chains against their guiding devices.
  • the pressure is reduced in the line 13, by controlling the pressure reducer 16, a slow leakage of fluid rightwardly through the check valve 14 brings the pressure within the cylinders 11 and 12 to the desired value.
  • the present invention contemplates connecting a valve in parallel with the check valve 14, such valve being controlled to open when the pressure in the line 13 falls.
  • the valve may be controlled by electromagnetic means, and opened by an electrical signal generated in response to a fall in pressure.
  • FIG. 2 an alternative embodiment of the present invention is illustrated, in which reference numerals which identify parts which are similar to those in the embodiment of FIG. 1 are primed.
  • the chains 1 and 2' having gripper bars 5' surround the sprockets 6 and
  • Two identical hydraulic devices 24 are connected in the branches 13a and 13b, and each includes a check valve 25 and another valve 26 connected in parallel with the check valve 25.
  • the valves 26 are operated by cams 22 supported for rotation with a cam shaft 21.
  • the cams 22 cooperate with operating levers 23 of the valves 26 to open and close these valves at prescribed times during each rotation of the shaft 21.
  • Rotation of the shaft 21 is synchronized with the movement of the 4 gripper bars 5'. This is accomplished readily by driving the cam shaft 21 with the same drive unit employed for driving the chains 1' and 2'.
  • the pump 17' delivers pressurized oil to the line 13.
  • the valves 26 are in their closed condition, and oil is passed to the cylinders 11' and 12'. through the check valves 25, in the manner which has been described with reference to FIG. 1.
  • the movement of the gripper bars 5 is occassionally stopped, so that a sheet may be gripped by one of the gripper bars or so that a sheet may be indexed prior to printing, cutting, or the like.
  • the chains 1 and 2' are also rendered stationary at the places where they are connected to the gripper bars 5.
  • the continued drive of the chain causes the sprockets 6' and 7' to be urged rightwardly, forcing the respective pistons of the cylinders 11' and 12' rightwardly with the force A F.
  • the earns 22 bring a notched portion of their surfaces into alignment with the operating levers 23 to open the valve 26, thereby permitting fluid to flow rightwardly from the cylinders 11' and 12' through the branches 13a and 13b.
  • the tension on the chain is maintained to a constant value, even while a portion of the chain is maintained at a stationary position during indexing of one of the gripper bars 5'
  • the valves 26 are again closed by action of the earns 22, and fluid is again supplied to the cylinders 11' and 12' through the check valves 25.
  • the apparatus of FIG. 2 therefore synchronizes the application of hy draulic fluid to the cylinders 11 and 12 with the operation of the printing press. Since the cam shaft is driven by the same drive as the press, increased operating speeds of the press are accompanied by increased rotational speeds of the cam shaft 21, so that synchronization is maintained at any speed of operation of the press.
  • a platen press having a transfer chain for intermittently driving a plurality of gripper bars
  • means for maintaining the chain under tension comprising a source of pressurized fluid, a cylinder connected with said source, a piston slidable within said cylinder and connected with said chain to apply a force to said chain, whereby the tension of said chain isproportional to the pressure of said fluid, means for maintaining the pressure of said fluid at a predetermined level, whereby a constant minimum tension is applied to said chain, and a check valve interconnected in the line between said source and said cylinder for preventing the rapid movement of said piston in response to a temporary increase in the tension of said chain.
  • Apparatus according to claim 1 including a reservoir, a pump coupled with said reservoir for pressurizing said fluid, and a pressure reducer interconnected between said pump and said cylinder to maintain a predetermined fluid pressure at said cylinder.
  • Apparatus according to claim 1 including a second valve connected in the circuit between said source and said cylinder, and means for controlling the operation of said valve in synchronism with the movement of said gripper bars.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drives For Endless Conveyors (AREA)
  • Discharge By Other Means (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00340059A 1972-03-14 1973-03-12 Apparatus for regulating the drive of a press or the like Expired - Lifetime US3847030A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH371972A CH548855A (fr) 1972-03-14 1972-03-14 Presse a platines pour le travail de matiere en feuilles.

Publications (1)

Publication Number Publication Date
US3847030A true US3847030A (en) 1974-11-12

Family

ID=4262029

Family Applications (1)

Application Number Title Priority Date Filing Date
US00340059A Expired - Lifetime US3847030A (en) 1972-03-14 1973-03-12 Apparatus for regulating the drive of a press or the like

Country Status (11)

Country Link
US (1) US3847030A (ru)
JP (1) JPS5523164B2 (ru)
BE (1) BE796623A (ru)
CA (1) CA980625A (ru)
CH (1) CH548855A (ru)
DE (1) DE2312186C3 (ru)
ES (1) ES412591A1 (ru)
FR (1) FR2179386A5 (ru)
GB (1) GB1397864A (ru)
IT (1) IT981366B (ru)
SE (1) SE403073B (ru)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9061845B2 (en) 2010-09-22 2015-06-23 Bobst Mex Sa Machine for processing elements in sheet form, comprising a chainset tensioner
CN105402337A (zh) * 2015-12-27 2016-03-16 天津尚吉液压设备有限公司 一种皮带顶紧装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939250C1 (ru) * 1989-11-28 1990-12-13 Miller-Johannisberg Druckmaschinen Gmbh, 6222 Geisenheim, De
DE102006051279A1 (de) * 2006-10-31 2008-05-08 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zur Veredelung von bogenförmigen Substraten
KR102015746B1 (ko) * 2016-03-09 2019-08-28 봅스트 맥스 에스에이 체인 텐셔너, 시트 형태 요소들을 프로세싱하기 위한 기계 및 체인들의 세트들을 인장하기 위한 방법
CN109436871A (zh) * 2018-11-20 2019-03-08 沧州铭洋自动化技术有限公司 一种数字印刷机皮带张力调整机构
CN112298929B (zh) * 2020-12-03 2024-06-04 中冶北方（大连）工程技术有限公司 传送带恒力柔性拉紧装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463022A (en) * 1967-10-24 1969-08-26 Caterpillar Tractor Co Chain adjuster
US3477766A (en) * 1967-08-15 1969-11-11 Cleveland Trencher Co Apparatus for tensioning a track or the like
US3549213A (en) * 1969-03-05 1970-12-22 Fred T Smith Track tightener for a crawler type vehicle
US3645586A (en) * 1970-07-08 1972-02-29 Caterpillar Tractor Co Track-adjusting and recoil mechanism
US3647270A (en) * 1968-11-13 1972-03-07 Orenstein & Koppel Ag Hydraulic chain-tensioning device, especially for tracklaying vehicles
US3718250A (en) * 1971-04-29 1973-02-27 United Ind Syndicate Constant tensioning device for the chains of conveyors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477766A (en) * 1967-08-15 1969-11-11 Cleveland Trencher Co Apparatus for tensioning a track or the like
US3463022A (en) * 1967-10-24 1969-08-26 Caterpillar Tractor Co Chain adjuster
US3647270A (en) * 1968-11-13 1972-03-07 Orenstein & Koppel Ag Hydraulic chain-tensioning device, especially for tracklaying vehicles
US3549213A (en) * 1969-03-05 1970-12-22 Fred T Smith Track tightener for a crawler type vehicle
US3645586A (en) * 1970-07-08 1972-02-29 Caterpillar Tractor Co Track-adjusting and recoil mechanism
US3718250A (en) * 1971-04-29 1973-02-27 United Ind Syndicate Constant tensioning device for the chains of conveyors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9061845B2 (en) 2010-09-22 2015-06-23 Bobst Mex Sa Machine for processing elements in sheet form, comprising a chainset tensioner
CN105402337A (zh) * 2015-12-27 2016-03-16 天津尚吉液压设备有限公司 一种皮带顶紧装置

Also Published As

Publication number Publication date
GB1397864A (en) 1975-06-18
DE2312186B2 (de) 1974-08-29
JPS49101105A (ru) 1974-09-25
IT981366B (it) 1974-10-10
CA980625A (en) 1975-12-30
DE2312186C3 (de) 1975-04-24
DE2312186A1 (de) 1973-09-27
FR2179386A5 (ru) 1973-11-16
JPS5523164B2 (ru) 1980-06-21
CH548855A (fr) 1974-05-15
ES412591A1 (es) 1976-01-16
SE403073B (sv) 1978-07-31
BE796623A (fr) 1973-07-02

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