EP0413446B1 - Machine de pliage - Google Patents

Machine de pliage Download PDF

Info

Publication number
EP0413446B1
EP0413446B1 EP19900308067 EP90308067A EP0413446B1 EP 0413446 B1 EP0413446 B1 EP 0413446B1 EP 19900308067 EP19900308067 EP 19900308067 EP 90308067 A EP90308067 A EP 90308067A EP 0413446 B1 EP0413446 B1 EP 0413446B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
settings
machine
adhesive
aforesaid
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
EP19900308067
Other languages
German (de)
English (en)
Other versions
EP0413446A3 (en
EP0413446A2 (fr
Inventor
Elizabeth Strickland
Frank Harry Wolloff
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.)
Noxet UK Ltd
Original Assignee
British United Shoe Machinery 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
Priority claimed from GB898918441A external-priority patent/GB8918441D0/en
Application filed by British United Shoe Machinery Ltd filed Critical British United Shoe Machinery Ltd
Publication of EP0413446A2 publication Critical patent/EP0413446A2/fr
Publication of EP0413446A3 publication Critical patent/EP0413446A3/en
Application granted granted Critical
Publication of EP0413446B1 publication Critical patent/EP0413446B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D8/00—Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks
    • A43D8/32—Working on edges or margins
    • A43D8/40—Working on edges or margins by folding, turning in or over, hammering
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D119/00—Driving or controlling mechanisms of shoe machines; Frames for shoe machines

Definitions

  • This invention is concerned with folding machines of the type comprising a main drive shaft driven by a motor, folding instrumentalities arranged at an operating locality of the machine, workpiece feeding means operable in time relation with the rotation of the main drive shaft for feeding a workpiece through the operating locality, and feed speed variation means for varying the speed of rotation of the main drive shaft.
  • the feed speed variation means comprises a variable output signalling device which supplies output signals in response to which drive signals are caused to be supplied to the motor driving the main drive shaft, said device having a range of positions between "maximum” and “minimum” end positions, and in that means is provided for setting a maximum for the speed of rotation of the main drive shaft, and thus for the feed speed as controlled by the feed speed variation means, the arrangement being such that the value of the output signal appropriate for achieving the set maximum speed of rotation of the main drive shaft (the "maximum output signal”) corresponds to the "maximum” end position of said device, regardless of the setting of said setting means, and the values of the output signals corresponding to positions intermediate the "maximum” and “minimum” end positions of the device are proportional, over the range of positions, to the value of the maximum output signal.
  • a setting of the maximum for the speed of rotation of the main drive shaft can be regarded as being an "operator-sensitive" setting.
  • other settings e.g. "style-sensitive” and “adhesive-sensitive” settings are also frequently made.
  • pre-selected "feed length” settings can be made by mechanical means, more particularly by the setting of physical stops representing maximum and minimum positions only. In this way, moreover, it will be appreciated, only two setting are available.
  • three distinct conditions are met, namely "straight" edges, "inside” corners and "outside” corners.
  • such a machine comprising means for sensing features of the position of a workpiece approaching the operating locality as the workpiece is fed as aforesaid, and feed length variation means for varying the distance through which a workpiece is so fed by the workpiece feeding means for each rotation of the main drive shaft, such variation being effected, in accordance with pre-selected "feed length" settings, automatically in response to the sensing of said workpiece features by the sensing means
  • said machine being characterised by means for storing sets of such pre-settings, each set comprising a plurality of settings, to be associated each with a sensed workpiece feature, and each set having an identification by which it can be recalled and thus rendered operational, and further characterised in that the setting of the maximum for the rotation of the main drive shaft is stored as a value which is applicable regardless of which set of "feed length" pre-settings is recalled and rendered operational.
  • the operator is now able to make appropriate settings for each workpiece shape and store them for subsequent recall each time she has to process a workpiece of that shape.
  • the settings may be made by a different operator, e.g. a more experienced operator, for use by the less skilled operator, until such time as the latter herself has acquired the desired level of skill.
  • the less skilled operator will be able readily to select a slower maximum feed rate at which to operate while nevertheless retaining the same degree of control through the signalling device as enjoyed by the more skilled operator operating at the higher rate, and of course as the skill of the less experienced operator increases, she will be able to increase the feed rate maximum without having to vary the settings previously made.
  • the folding instrumentalities include a creaser foot about which folding of the workpiece is effected and adhesive is supplied into the fold thus formed through an outlet provided in the creaser foot.
  • means is provided for setting a value for the temperature of the creaser foot, heating means being also provided for heating said foot to and maintaining it at or close to the temperature corresponding to the value set.
  • the temperature setting is stored as a value applicable whichever set of pre-settings is recalled and rendered operational. It will of course be appreciated that this setting is an adhesive-sensitive setting, as referred to above, and thus also will be unlikely to require variation by reason of changes in workpiece shape only.
  • thermo-cementing and folding machine may comprise adhesive supply means, first selector means for selecting whether or not adhesive is to be supplied, and second selector means for setting the rate at which adhesive is to be supplied, said rate as set also being variable proportionately with the workpiece feed length as set by the feed length variation means, and for each set of pre-settings a first value corresponding to the status of the first selector means and a second value corresponding to the selected adhesive flow rate may also be stored as part of said set and thus be recallable and rendered operational as aforesaid.
  • a delay in the initiation of the flow of adhesive at the start of a cycle of operation of the machine can be set, and moreover for each set of pre-settings a third value corresponding to the selected delay may also be stored as part of said set and thus be recallable and rendered operational as aforesaid.
  • first inhibit means may be provided for rendering ineffective signals supplied by the sensing means by which "inside" corners are sensed and second inhibit means for rendering ineffective signals supplied by the sensing means by which "outside” corners are sensed, and further for each set of pre-settings a value for each of said inhibit means corresponding to the status thereof may be stored as part of said set and each such value be recallable and rendered operational as aforesaid.
  • disabling means may be provided for rendering the sensing means ineffective to control the operation of the workpiece feed length varyation means and operator-actuatable means may then be provided for selecting the appropriate pre-selected settings forming part of the particular operational set of settings. In this case too a value corresponding to the status of the disabling means may be stored as part of the set for subsequent recall as aforesaid.
  • further disabling means may also be provided for disabling said operator-actuatable means and a value corresponding to the status of said further disabling means may also be stored as aforesaid.
  • the sensing means is also effective to initiate the supply of adhesive when the approach of a workpiece to the operating locality of the machine is sensed thereby and further operator-actuatable means may be provided for initiating the supply of adhesive if the sensing means is rendered ineffective as aforesaid.
  • the folding instrumentalities include snipping means by which the portion of the workpiece being folded can be snipped to facilitate the folding thereof.
  • operator-actuatable inhibit means may be provided for inhibiting under operator control either the adhesive supply or the operation of the snipping means, function selection means being provided for selecting which of the two latter-mentioned inhibit functions is to be operative, and for each set of pre-settings a value corresponding to the status of said function selection means may be stored as part of said set and be recallable and rendered operational as aforesaid.
  • the folding instrumentalities include snipping means
  • means may also be provided for setting the rate at which snipping operations are effected, said rate being proportional to the workpiece feed length as controlled by the feed length variation means, and again for each set of pre-settings a value corresponding to the setting of the snipping rate setting means may be stored as part of said set and be recallable and rendered operational as aforesaid.
  • the snipping feed rate setting means constitutes the first inhibit means when the rate set by said setting means is zero.
  • thermo-cementing and folding machine which finds use in the shoe industry and allied trades and is generally similar, except as hereinafter described, to the machine described in GB-A 2141968, itself a modification of the machine described in EP-A 0110591.
  • the machine thus comprises a work table 10 on which a workpiece can be supported at an operating locality of the machine, at which conventional folding instrumentalities are located, comprising a fold-initiating block 12 having an upwardly curved work-guiding surface 14, a gauge finger 16, a creaser foot 22 and a lip turner (not shown), which completes the fold of the workpiece edge over the creaser foot.
  • adhesive can be applied to the workpiece edge through an outlet in the creaser foot, to which adhesive is supplied via a delivery tube 24 from a melt chamber 28 under the action of a gear pump 26, which is driven by a stepping motor SM2.
  • the melt chamber 28, delivery tube 24 and creaser foot 22 are heated respectively by heaters H1, H2, H3.
  • Other features of the folding instrumentalities are shown in Figure 1.
  • "Downstream" of the folding instrumentalities are located conventional edge snipping means generally designated 30, comprising a fixed and movable blade 32, 34, and conventional workpiece feeding means in the form of an orbitally moving hammer-and-anvil arrangement (not shown), which also serves to consolidate the fold.
  • a work release clamp (not shown) is also provided for clamping the work against the under-side of the creaser foot during the return movement of the hammer-and-anvil arrangement.
  • the hammer-and-anvil arrangement is driven through a main drive shaft (not shown) by means of an electric motor M1 operation of which is controlled in turn by computer control means (see Figures 2 to 6) through an inverter I.
  • the inverter receives drive signals from the computer control means in the form of a voltage and in response thereto drives the electric motor.
  • the electric motor is in this case an a.c. induction motor.
  • the motor and more particularly the speed of the motor, and thus the speed of rotation of the main drive shaft may be controlled either automatically or by the operator using a first treadle (not shown), which incorporates a variable output signalling device in the form of a transducer T ( Figure 2), forming part of operator-controlled feed speed variation means for varying the speed of rotation of the main drive shaft and thus the speed at which workpieces are fed through the operating locality of the machine.
  • a second treadle (also not shown) is provided by means of which, in a "manual" mode of operation of the machine, by selectively depressing respectively the toeward and heelward portions of the treadle, two switches S6, S7, can be actuated under operator control.
  • switch S6 actuates a stepping motor SM1 by which, through a mechanical arrangement including a feed length control lever (not shown), the amount through which the hammer-and-anvil arrangement moves fore-and-after for each revolution of the main drive shaft (hereinafter referred to as the "feed length"), is varied thus to effect pleating of the folding over margin of the workpiece.
  • switch S7 operates a solenoid SOL2 which causes the edge snipping means 30 to operate and at the same time operates the motor SM1 to vary the feed length according to the appropriate setting.
  • provision is made in the form of three selector devices SS1, SS2, SS3 on a control panel 36 of the machine.
  • Each selector device comprises a digital display and means for scrolling up or down the displayed numerical indicator; each selector device is thus capable of selecting a feed length in a range 0 to 9, the selected "feed length" representing a value for a signal which is supplied to the stepping motor SM1.
  • the first selector device SS1 is utilised to set the feed length for "normal"(i.e.
  • the pleating feed length is likely to be relatively short, in order to enable pleating to be effected, while the "snipping" feed length will normally be somewhat longer, in order to avoid mere fraying of the edge by too many snips being made in the fold.
  • the feed length settings are thus made for each workpiece to be processed. These are then stored in computer memory and are recallable and thus rendered operational using an identification in the form of a two-digit code.
  • a further selector device SS4 is also provided on the control panel incorporating a two-digit display and serving to enable the code (or style number) to be allocated to each set of feed length settings selected, the style number providing access, via the computer control means, to the memory in which information relating to the feed lengths is stored at an address accessed by the style number.
  • an "enter" button E is also provided on the control panel.
  • the machine has a "mains on/off” switch S1, a "motor on/off” S2, a “work lamp on/off” switch S3 and a so-called knee-switch S5 for purposes which will be described later.
  • the control panel 36 of the machine also has the following switches for the purposes set out hereinafter:
  • control panel 36 Also on the control panel 36 are further selector devices, each of which comprises a plurality of bars which can be illuminated to indicate a progressive incrementing or decrementing of a value, selector buttons (+ and -) being provided for effecting such incrementing and decrementing:
  • a number of pre-selections may be made, in addition to the three feed length settings, according to the shape of workpiece being operated upon (the "style-sensitive" settings); these comprise those made using switches S4, S8, S9, S10, S12, SS5, SS6 and SS9.
  • operation of the enter button E will be effective to store appropriate values for the status of each of these switches as part of the set of settings selected for the particular workpiece shape and all these settings, together with the feed length settings, are recallable and rendered operational by the operation of switch SS4.
  • the setting made using switch SS7 is operator-sensitive and thus remains fixed, regardless of workpiece shape, unless and until altered by the operator.
  • the setting made using switch SS8 is adhesive-sensitive and will remain unchanged for style changes unless and until altered by the operator.
  • the control of adhesive supply (on/off function) and the selection of feed length is effected using a sensing arrangement including two emitters E1, E2 (constituting further sensing means of the machine) by which the supply of adhesive is controlled, four emitters E3, E4, E5, E6 by which an approaching "inside" corner in the edge contour of the workpiece being operated upon is sensed and which control solenoid SOL2 and also serve to select the "snipping" feed length, through stepping motor SM1 driving the feed length control lever, as hereinbefore referred to, and a further emitters E7 (the emitters E3-E7 constituting sensing means of the machine) by which an approaching "outside" corner in the workpiece edge contour is sensed and the "pleating" feed length selected.
  • a sensing arrangement including two emitters E1, E2 (constituting further sensing means of the machine) by which the supply of adhesive is controlled, four emitters E3, E4, E5, E6 by which an approaching "inside" corner in the edge contour of the
  • switch S1 when switch S1 is switched on, mains power is supplied sequentially to heaters H1, H2 and H3 such that the various integers heated thereby reach operating temperature at essentially the same time.
  • the appropriate lamp indicates that adhesive is available and that the machine is ready for operation.
  • power is supplied to solenoid SOL2, which, in response to appropriate signals, controls the edge snipping arrangement 30, and also to a transformer (not shown) which steps down the voltage to 12 volts for supply to a work lamp circuit which includes the "worklamp" switch S3.
  • the 12 volt circuit is an a.c.
  • an unsmoothed 12 volts d.c. circuit which supplies power to a mains-controlled control box CB supplying a "mains interrupt" signal, to be referred to hereinafter.
  • a smoothed 12 volt d.c. circuit which supplies power to stepper motor SM2, which drives the gear pump, and also to stepper motor SM1, by which the feed length control lever is operated.
  • a 5 volts circuit which drives a central processor unit CPU and associated circuits and also provides power to the various switches and integers of the electrical and electronic circuits of the machine.
  • the central processor unit CPU which controls the machine, is constituted by a single-chip 8-bit micro-computer (in casu, a Zilog Z8681 which, in addition to a microprocessor, also incorporates a random access memory/scratch pad RAM (shown separately in Figure 2); this microprocessor is obtainable from Zilog Inc).
  • a system clock C comprising a free-running 12 MHz crystal, is provided.
  • the CPU is connected via input-output bus I/OB with input and output ports IP, OP, a non-volatile memory in the form of an EPROM (erasable programmable read-only memory), which is accessed by the CPU via the I/OB for instructions to execute, and an EEPROM (electrical eraseable programmable read-only memory) for the storage of style and "machine status" information.
  • an analogue-to-digital converter ADC is provided, to which signals are supplied by the various integers shown in Figure 2, including thermisters TS1, TS2, TS3 (which sense the temperatures of the components heated by heaters H1, H2, H3) and the various switches and selector devices.
  • the ADC is interrogated by the CPU, via the I/OBus, each time a mains interrupt signalis supplied to the CPU by the control box CB. More particularly the various channels of the ADC are interrogated in turn, one in response to each mains interrupt in a so-called "wrap around" sequence.
  • the ADC supplies information as to the state of the interrogated channel via the input port IP.
  • the various switches and selector devices supply information as to the state of the interrogated channel via the data bus I/OB.
  • a digital-to-analogue converter DAC is provided which supplies analogue control signals to the inverter I for driving the motor M1, in accordance with digital signals received from the CPU.
  • the control circuit also comprises a re-set sub-circuit R which is directly connected into the CPU and by which, upon starting up of the machine, the CPU is enabled to set the controls to their correct state in a rapid manner.
  • a shaft encoder E driven by the main drive shaft is also provided having a direct "interrupt" input to the CPU.
  • the CPU supplies outputs OP via the data bus I/OB to sub-circuits controlling the heaters H1, H2, H3, the solenoid SOL2, drives for stepper motors SM1,SM2, emitters E1 to E7 and relay RL1 as well as to the inverter I as already referred to.
  • the relay RL1 serves as a "watch dog" over the whole of the control circuit.
  • the sub-circuit receives a signal at each mains interrupt, the signal serving to change the state of the circuit between "1" and "0", the arrangement being such that switching to the "1" state constituting the "refresh” signal.
  • the sub-circuit is arranged to become de-energised, in the absence of a refresh signal, after a time interval which is greater than the interval between two "1" signals.
  • De-energisation of the sub-circuit switches off the relay, thereby terminating the power supply to the machine.
  • the emitters constituting the various sensing means, are actuated in response to control pulses supplied by the CPU sequentially thereto at each system clock interrupt and emit pulses of infra-red radiation, which are separately received by the receiver E/R located in the machine head above the emitters.
  • control pulses supplied by the CPU sequentially thereto at each system clock interrupt and emit pulses of infra-red radiation, which are separately received by the receiver E/R located in the machine head above the emitters.
  • other types of sensing means may of course be utilised.
  • FIGS. 3 to 6 constitute flow charts illustrating various functions of the software by which the machine in accordance with the invention is controlled. It will be noted that there are no inscriptions within any of the boxes of the flow charts, but rather a full description of each step is appended to this specification.
  • the status of switch S9 is checked to determine whether the adhesive supply (on/off), snipping and pleating functions are to be controlled automatically, namely through the emitters E1 to E7, or under operator control, using the knee-switch S5 and treadles; the machine in this regard operates in the same manner as described in GB-A 2141968. If a "No" is obtained, indicating that "manual” has been selected, at step 652 a command is issued to ensure that the motor will not operate in “automatic”mode, and at step 654 the status of knee-switch S5 is monitored.
  • step 650 If the machine is not switched on, then the software loops back to step 650, but in the event that the knee-switch is actuated, adhesive is supplied, initially, ie at the start of a cycle of operation of the machine, with a "fast forward" cycle of operation of the machine, with a “fast forward” operation of the motor to give a surge, generally as described in EP-A 0110591 (Step 656).
  • the control of the rate of adhesive supply will be described hereinafter in connection with Figure 5.
  • the status of knee switch S5 continues to be monitored at step 658; it will be recalled that as described in GB-A 2141968, the knee switch must be released by the operator and reactuated in order to switch off the adhesive flow. When such flow is switched off, the operation of the stepping motor SM2 is stopped and reversed to provide for suck-back of the adhesive, both initially and thereafter intermittently, as described in detail in EP-A 0154441 (step 660).
  • switches and selector devices e.g. those relating to the control of the snipping and pleating functions are regularly and frequently monitored and any signals therefrom processed.
  • step 650 the status of emitters E1, E2 is interrogated (step 662). In the event that the emitters are uncovered, then a command is issued to ensure that the motor will not operate in "automatic” mode (step 664) and the circuit loops back to step 650. Where the emitters E1, E2 are covered, indicating that a workpiece is present then any delay in the initiation of adhesive supply, as selected by selector device SS5 is executed (step 666) and thereafter the status of switch S11 is interrogated, to determine whether the motor M1 is to be controlled automatically or by the operator using the right hand treadle. In the case of "automatic" selection, the motor M1 is switched on (step 670).
  • step 674 the supply of adhesive is initiated, in the same manner as described previously with reference to step 656 and this continues until the emitters E1, E2 are once more uncovered (step 674).
  • a delay in switching off the adhesive supply is calculated (step 676), on the basis of rotations of the main drive shaft between the uncovering of the first emitter and that of the second; it will be appreciated that the two emitters lie one after the other in the general feed direction.
  • the calculated delay is then implemented at step 678 and thereafter the adhesive supply is switched off (step 680), in the same manner as described with reference to step 660.
  • step 682 the status of switch S11 is once more interrogated, essentially to ensure that the workpiece is fed completely out of the operating locality, the arrangement being such that if "automatic" operation has been selected, a delay, based upon the current feed length selected by one of selected devices SS1, SS2, SS3, is calculated and implemented (684 and 686) prior to the motor M1 being switched off (step 688). In the event that "manual" operation has been selected, then it is assumed that the operator will ensure that the workpiece has been fed from the operation locality. Thereafter the circuit loops back to step 650.
  • the knee-switch may serve to inhibit either "snipping" or the adhesive supply when actuated.
  • operation of the knee-switch S5 acts as an emergency stop.
  • step 700 the status of said switch is interrogated. If "automatic" operation is selected then at step 702 the status of the emitters E1, E2 is interrogated, that is to say the presence of a workpiece is checked for. If a workpiece is present then at step 704 the "basic speed" of the motor is set at 2,400 rpm; this is in fact a function of the software itself, the particular speed being assessed as being the optimum for the operation of a machine of this kind.
  • step 706 thereafter the status of selector device SS7, by which a proportional value of the set speed (in this case 2,400 rpm) is selected by the application of a reduction factor and at step 708 the software then calculates, e.g. by look-up tables, the value of the drive signal to be supplied to the motor M1 to achieve the desired speed and the drive signal is supplied accordingly.
  • the actual speed of rotation of the main drive shaft which is monitored by the shaft encoder E, is calculated from the output of the encoder and at step 712 the difference between the calculated and the actual speed is determined and compared with a pre-set tolerance.
  • the drive signal supplied to the motor M1, as previously calculated at step 708, is modified according to a feedback factor (step 714), said factor being calculated so as to bring actual speed of rotation of the shaft up to the desired speed and this feedback factor is then applied to the drive signal value (step 716).
  • the feedback factor is thereafter stored and is applied, without further modification, provided that the difference between the desired and actual speed of rotation of the main drive shaft remains within the tolerance.
  • the appropriate drive signal is thus applied to motor M1 (step 718) and the circuit then loops once more back to step 700.
  • step 702 In the event that at step 702 the emitters E1, E2 become uncovered, indicating that a workpiece is no longer present, then, bearing in mind that this circuit is continuously looping, at step 720 a signal to stop the operation of motor M1 is supplied.
  • the status of the signal from the transducer associated with the right hand treadle is interrogated, in particular, the treadle will either indicate a "stop” condition or a "drive” condition, in which latter case the value of the signal from the transducer will be converted proportionally to a motor speed.
  • the transducer is also able to provide a further signal, namely by the operator depressing the treadle with her heel to signal a requirement that the machine is brought to a stop with the hammer-and-anvil arrangement in a closed condition; this may be desirable where a workpiece has not been completely processed but rather it is desirable to carry out some intermediate operation on the workpiece part-way through a cycle of operation.
  • step 724 therefore, this condition of the transducer is sought and in the event that a corresponding signal is provided, then at step 726 the motor M1 is switched off with the hammer-and-anvil arrangement in closed condition. Otherwise if no such signal has been provided, then at step 728 the status of the transducer is interrogated as to whether it is in a "stop" or "drive” condition. If "stop” has been selected, then the circuit leads to step 720 and the motor M1 is switched off, this time with the hammer-and-anvil arrangement in an open condition.
  • steps 706 and subsequent steps are followed as described above; that is to say the reduction factor which is set by device SS7 is applied to the motor speed set according to the position of the transducer in "drive” mode and drive signals are supplied to the motor M1 as aforesaid.
  • Figure 5 relates to the operation of the adhesive supply means, more particularly the signalling supplied to stepping motor SM2.
  • the required adhesive supply rate as set by selector device SS9, is ascertained and, in accordance with the current speed of rotation of the main drive shaft, as ascertained from the shaft encoder (step 732), the requested adhesive supply rate is modified proportionally, namely by dividing the actual speed of rotation of the main drive shaft by 2,400 and thus arriving at a proportion to be applied to the requested adhesive rate (step 734).
  • step 736 and 738 the question of whether a snipping or pleating operation respectively has been selected is posed.
  • step 744 the adhesive supply rate as determined at step 734 is modified by this further modification factor and thereafter the appropriate drive signal is supplied to motor SM2 (step 740).
  • Figure 6 indicates further aspects of the software relating to the adjustment of feed length which will take place during the operating cycle of the machine. It will thus be appreciated that, as with the sections of software to which Figs. 4 and 5 also relate, these sub-programs are access regularly and frequently during the general operation of the machine as set out in Figure 3. The particular sub-program is brought into effect only if a change in feed length is indicated, either by a signal from the emitters E3 to E7 or a signal from the left hand treadle, depending on the particular mode of operation of the machine. In the event that a new feed length is indicated then at step 750 the question is posed as to whether a feed length change is currently taking place. If so, then at step 752 an instruction to wait for the current change to be completed is supplied.
  • step 754 the displacement of the feed length control lever necessary to bring about the required change of feed length is calculated in terms of steps of stepping motor SM1 by which the position of the lever is varied. It is the intention that any change of feed length which takes place during the operating cycle of the machine, i.e. when the machine is actually running, is effected smoothly as opposed to previous machines in which the change has been effectively instantaneous, leading to "snatching" of the workpiece as the change takes place. If, however, the motor M1 is not in fact operating at the time of the feed length change, as checked at step 756, then the feed length change can be promptly executed and to this end at step 758 the motor feed speed is treated as at the maximum so that the change of feed length is effected in the quickest possible time.
  • step 760 the actual speed of rotation of the main drive shaft is calculated using shaft encoder E (step 760).
  • step 762 the stepping rate of stepping motor SM1 required to displace the feed length control lever through the appropriate distance within a pre-set number of, e.g. 3, revolutions of the main drive shaft (which will give an allowed time dependent upon the speed of rotation of the drive shaft as calculated at step 760 or set at step 758) is calculated, such calculation being of course dependent upon the maximum stepping rate limit for the motor SM1.
  • the stepping motor cannot achieve the stepping rate required, then it will be operated at a maximum speed to achieve the change of feed length in the smallest time commensurate with that speed.
  • the change in the rate of adhesive supply corresponding to the feed length change may also be similarly "phased" to achieve a smooth transition.
  • step 764 the calculated stepping rate is then implemented and the control lever displaced.

Landscapes

  • Labeling Devices (AREA)

Claims (11)

  1. Machine à plier comprenant
       un arbre menant principal entraîné par un moteur (M1),
       des instruments de pliage (12, 14, 16, 22, 30) disposés à un emplacement de travail de la machine,
       un moyen d'amenée de pièces à travailler actionnable en relation synchronisée avec la rotation de l'arbre menant principal servant à faire passer une pièce à travailler à travers l'emplacement de travail, et
       un moyen (T) de variation de vitesse d'amenée servant à faire varier la vitesse de rotation de l'arbre menant principal,
       caractérisée en ce que le moyen (T) de variation de vitesse d'amenée comprend un dispositif (T) de signal de sortie variable qui fournit des signaux de sortie en réponse auxquels on provoque le passage de signaux d'entraînement au moteur entraînant l'arbre menant principal, ledit dispositif (T) ayant une gamme de positions entre des positions extrêmes "maximum" et "minumum",
    et en ce qu'un moyen (SS7) est prévu servant à régler un maximum pour la vitesse de rotation de l'arbre menant principal, et donc pour la vitesse d'amenée telle que commandée par le moyen (T) de variation de vitesse d'amenée, l'agencement étant tel que la valeur du signal de sortie appropriée pour obtenir la vitesse de rotation maximum réglée de l'arbre menant principal (le "signal de sortie maximum") correspond à la position extrême "maximum" dudit dispositif, sans tenir compte du réglage dudit moyen de réglage (SS7), et les valeurs des signaux de sortie correspondant aux positions intermédiaires entre les positions extrêmes "maximum" et "minimum" du dispositif sont proportionnelles, sur toute la gamme de positions, à la valeur du signal de sortie maximum.
  2. Machine selon la revendication 1, comprenant en outre
       des moyens (E3 à E7) servant à détecter des caractéristiques de la position d'une pièce à travailler en approche de l'emplacement de travail lorsque la pièce à travailler est amenée de la manière susmentionnée, et
       un moyen (SM1) de variation de longueur d'amenée servant à faire varier la distance sur laquelle une pièce à travailler est ainsi amenée par le moyen d'amenée de pièces à travailler pour chaque rotation de l'arbre menant principal, une telle variation étant effectuée, conformément à des réglages de "longueur d'amenée" présélectionnés, automatiquement en réponse à la détection desdites caractéristiques de la pièce à travailler effectuée par les moyens de détection,
    ladite machine étant caractérisée par des moyens servant à mettre en mémoire des ensembles de tels pré-réglages, chaque ensemble comprenant une pluralité de réglages, chacun devant être associé à une caractéristique d'une pièce à travailler détectée, et chaque ensemble possédant une identification grâce à laquelle il peut être rappelé et ainsi rendu opérationnel,
    et caractérisée en outre en ce que le réglage du maximum pour la rotation de l'arbre menant principal est mis en mémoire sous forme d'une valeur qui est applicable sans tenir compte de quel ensemble de pré-réglages de "longueur d'amenée" est rappelé et rendu opérationnel.
  3. Machine selon la revendication 2, dans laquelle les instruments de pliage (12, 14, 16, 22) comprennent un pied plisseur (22) autour duquel s'effectue le pliage de la pièce à travailler, et dans lequel de l'adhésif est fourni dans le pli ainsi formé à travers un orifice de sortie prévu dans le pied plisseur, et en outre dans laquelle un moyen (SS8) est prévu servant à régler une valeur pour la température du pied plisseur (22), un moyen de chauffage (H3) étant également prévu servant à chauffer ledit pied jusqu'à la température correspondant à la valeur réglée et à le maintenir au niveau ou proche de celle-ci,
    caractérisée en ce que le réglage de température est mis en mémoire sous forme d'une valeur applicable quel que soit l'ensemble de pré-réglages qui est rappelé et rendu opérationnel.
  4. Machine selon l'une ou l'autre des revendications 2 et 3, comprenant un moyen (22, 28) d'alimentation en adhésif, un premier moyen de sélection (S4) servant à sélectionner si oui ou non on doit fournir de l'adhésif, et un second moyen de sélection (SS9) servant à régler la vitesse à laquelle on doit fournir l'adhésif, ladite vitesse telle que réglée étant également variable proportionnellement à la longueur d'amenée de pièce à travailler telle que réglée par le moyen de variation de longueur d'amenée (-, SM1),
    caractérisée en ce que pour chaque ensemble de pré-réglages une première valeur correspondant à l'état du premier moyen de sélection (S4) et une seconde valeur correspondant à la vitesse d'écoulement d'adhésif sélectionnée sont également mises en mémoire comme faisant partie dudit ensemble et sont ainsi susceptibles d'être rappelées et rendues opérationnelles de la manière susmentionnée.
  5. Machine selon la revendication 4, dans laquelle un moyen de sélection de retard (SS5) est prévu grâce auquel on peut régler un retard lors du lancement de l'écoulement d'adhésif au début d'un cycle de travail de la machine,
    caractérisée en ce que pour chaque ensemble de pré-réglages une troisième valeur correspondant au retard sélectionné est également mise en mémoire comme faisant partie dudit ensemble et elle est donc susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
  6. Machine selon l'une quelconque des revendications précédentes, dans laquelle le moyen de détection (E3, E7) est actif pour détecter l'approche de l'emplacement de travail des coins "intérieurs" (tels que définis dans ce document) du bord d'une pièce à travailler en cours d'amenée de la manière susmentionnée ainsi que l `approche des coins "extérieurs" (tels que définis dans ce document) d'un tel bord, et dans laquelle un premier moyen inhibiteur (SS6) est prévu servant à rendre sans effet les signaux fournis par le moyen de détection grâce auquel les coins "intérieurs" sont détectés et un second moyen inhibiteur (S12) servant à rendre sans effet des signaux fournis par le moyen de détection grâce auquel les coins "extérieurs" sont détectés,
    caractérisée en ce que pour chaque ensemble de pré-réglages une valeur pour chacun desdits moyens inhibiteurs (SS6, S12) correspondant à l'état de ceux-ci est mise en mémoire comme faisant partie dudit ensemble et chaque dite valeur est susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
  7. Machine selon l'une quelconque des revendications 2, 3, 4 et 5 ou de la revendication 6 en conjonction directe ou indirecte avec l'une quelconque des revendications 2, 3, 4 et 5, comprenant un moyen de mise hors service (S9) servant à rendre le moyen de détection (E3-E7) sans effet pour commander le fonctionnement du moyen de variation de longueur d'amenée (-, SM1) conjointement avec un moyen actionnable par l'opérateur et servant à sélectionner les réglages pré-sélectionnés appropriés faisant partie de l'ensemble de réglages opérationnel particulier,
    caractérisée en ce que pour chaque ensemble de pré-réglages une valeur correspondant à l'état du moyen de mise hors service (S9) est mise en mémoire comme faisant partie dudit ensemble et est susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
  8. Machine selon la revendication 7, comprenant un moyen de mise hors service supplémentaire (S8) servant à mettre hors service le moyen actionnable par l'opérateur (S6, S7) servant à sélectionner les réglages appropriés de la manière susmentionnée,
    caractérisée en ce que pour chaque ensemble de pré-réglages une valeur correspondant à l'état dudit moyen de mise hors service supplémentaire (S8) est mise en mémoire comme faisant partie dudit ensemble et est susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
  9. Machine selon l'une ou l'autre des revendications 7 et 8 en conjonction directe ou indirecte avec la revendication 4, dans laquelle un moyen de détection supplémentaire (E1, E2) est prévu, lequel est actif pour lancer l'alimentation en adhésif lorsque l'approche d'une pièce à travailler de l'emplacement de travail de la machine est ainsi détectée,
    caractérisée en ce qu'un moyen supplémentaire actionnable par l'opérateur (S5) est prévu servant à lancer l'alimentation en adhésif si le moyen de détection supplémentaire (E1, E2) est rendu sans effet de la manière susmentionnée.
  10. Machine selon la revendication 9 ou l'une ou l'autre des revendications 7 et 8 en conjonction directe ou indirecte avec la revendication 4, dans laquelle les instruments de pliage (12, 14, 16, 22, 30) comprennent un moyen coupeur (30) grâce auquel la portion de la pièce à travailler en cours de pliage peut être coupée afin de faciliter son pliage, et dans laquelle un moyen inhibiteur actionnable par l'opérateur (S5) est prévu servant à inhiber sous la commande de l'opérateur soit l'alimentation en adhésif soit le fonctionnement du moyen coupeur, un moyen de sélection de fonction (S10) étant prévu servant à sélectionner celle des deux fonctions d'inhibition mentionnées dernièrement qui sera opérative,
    caractérisée en ce que pour chaque ensemble de pré-réglages une valeur correspondant à l'état dudit moyen de sélection de fonction (S10) est mise en mémoire comme faisant partie dudit ensemble et est susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
  11. Machine selon l'une quelconque des revendications 2 à 5, 7, 8 et 9 ou à la revendication 6 en conjonction directe ou indirecte avec l'une quelconque des revendications 2 à 5, dans laquelle les instruments de pliage (12, 14, 16, 22, 30) comprennent un moyen coupeur (30) grâce auquel la portion de la pièce à travailler en cours de pliage peut être coupée afin de faciliter son pliage, et dans laquelle un moyen (SS6) est prévu servant à régler la vitesse à laquelle les opérations de coupe sont effectuées, ladite vitesse étant proportionnelle à la longueur d'amenée telle que commandée par le moyen de variation de longueur d'amenée (-, SM1),
    caractérisée en ce que pour chaque ensemble de pré-réglages une valeur correspondant au réglage du moyen de réglage de vitesse de coupe (SS6) est mise en mémoire comme faisant partie dudit ensemble et est susceptible d'être rappelée et rendue opérationnelle de la manière susmentionnée.
EP19900308067 1989-08-12 1990-07-24 Machine de pliage Expired - Lifetime EP0413446B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8918441 1989-08-12
GB898918441A GB8918441D0 (en) 1989-08-12 1989-08-12 Folding machines
GB8922711 1989-10-09
GB898922711A GB8922711D0 (en) 1989-08-12 1989-10-09 Folding machines

Publications (3)

Publication Number Publication Date
EP0413446A2 EP0413446A2 (fr) 1991-02-20
EP0413446A3 EP0413446A3 (en) 1992-04-08
EP0413446B1 true EP0413446B1 (fr) 1995-08-30

Family

ID=26295748

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19900308067 Expired - Lifetime EP0413446B1 (fr) 1989-08-12 1990-07-24 Machine de pliage
EP19900308066 Expired - Lifetime EP0413445B1 (fr) 1989-08-12 1990-07-24 Machine de pliage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19900308066 Expired - Lifetime EP0413445B1 (fr) 1989-08-12 1990-07-24 Machine de pliage

Country Status (2)

Country Link
EP (2) EP0413446B1 (fr)
DE (2) DE69021969T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9123184D0 (en) * 1991-11-01 1991-12-18 British United Shoe Machinery Edge folding machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028138B1 (fr) * 1979-10-26 1985-10-09 Matsushita Electric Industrial Co., Ltd. Machine à coudre
GB2141968B (en) * 1983-06-22 1986-06-25 British United Shoe Machinery Cementing and folding machine
GB8404965D0 (en) * 1984-02-25 1984-03-28 British United Shoe Machinery Adhesive supply system

Also Published As

Publication number Publication date
DE69021969D1 (de) 1995-10-05
EP0413446A3 (en) 1992-04-08
DE69026663T2 (de) 1996-09-05
EP0413445B1 (fr) 1996-04-24
EP0413446A2 (fr) 1991-02-20
DE69026663D1 (de) 1996-05-30
DE69021969T2 (de) 1996-02-22
EP0413445A2 (fr) 1991-02-20
EP0413445A3 (en) 1992-04-08

Similar Documents

Publication Publication Date Title
EP0110591B1 (fr) Machine à coller à chaud et à rabattre
US4100865A (en) Programmable sewing machine operable in a plurality of modes
US4092937A (en) Automatic stitching by programmable sewing machine
EP0117713B1 (fr) Méthode et appareil pour coudre les pointes de col sur machine à coudre à deux aiguilles indépendantes
JPH0248272B2 (fr)
US4403558A (en) Control system for sewing machine
US4588109A (en) Adhesive supplying system
EP0103364B1 (fr) Méthode et dispositif pour ralentir la vitesse d'un moteur d'une machine à coudre avant l'arrêt
EP0413446B1 (fr) Machine de pliage
US4154179A (en) Automatic back-tack system for industrial sewing machine
US4929296A (en) Machine for glueing and folding sheet-like materials
US5571240A (en) Apparatus and method for controlling sewing machine
US4555997A (en) Semi-automatic sewing machine control system
US4557787A (en) Automatically controlled thermo-cementing and folding machine
GB2141968A (en) Cementing and folding machine
US4545310A (en) Method and apparatus for accurately controlling the seam margins produced by a semi-automatic sewing machine
EP0540333A1 (fr) Dispositif de pliage de bords
US5271348A (en) Drive arrangement
EP0413447A2 (fr) Dispositif de commande
EP0233292B1 (fr) Systeme de commande pour machine de moulage par injection entraine par des servomoteurs
EP0132286B1 (fr) Machines de plissage
US4570112A (en) Control circuit for numerically controlled motor
EP0271303B1 (fr) Machine pour le montage des côtés de dessus de chaussures
US5636583A (en) Industrial sewing machine comprising an electronic control means and sewing method
GB2148541A (en) Machine for operating progressively along a marginal portion of a workpiece of sheet material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19920904

17Q First examination report despatched

Effective date: 19940425

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

ET Fr: translation filed
REF Corresponds to:

Ref document number: 69021969

Country of ref document: DE

Date of ref document: 19951005

ITF It: translation for a ep patent filed

Owner name: UFFICIO BREVETTI RICCARDI & C.

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960617

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960620

Year of fee payment: 7

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970402

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970724

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970724

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050724