DE2000205A1 - Device for regulating the phase between two synchronously rotating shafts - Google Patents

Description

Burroughs Corporation, Detroit, Michigan, VStA

Device for regulating the phase between two synchronously rotating shafts.

The invention relates to an apparatus for Einregu- a phase lose synchronism between two rotating shafts or generally circumferential to the Balancing the phase or the amount of rotation between at least two parts.

The invention is particularly useful when used in conjunction with a machine which advances strip material an intermediate length through a work zone to perform operations on the strip material, often, but not necessarily, under the control of a control or endless strip. These operations on the strip material can be of various types. For example, it may be desirable to have the materiaj. to punch or punch or to print. Usually, these% operations are performed on the strip material in that it is moved relative to a work station. With a view to this special application, the invention is described in connection with such a type of machine, namely a high-speed printer which is used as the output of a data processing system.

In recent times much progress has been made with high-speed printers in which the strip or dao paper Line by line under the control of a tax tire

009835/1706

voiwurtsbewegungc is through the pressure zone. To control dea The size and speed of the paper advance electromagnetically operated clutches are used, and to stop the paper movement, an electromagnetic applied brake used. An example of this ... genus of cischinen is described in more detail in the United States patent application Docket DM 190, dated Dec. 18, 1 ^ 68 has been submitted, entitled "Dual Speed Paper Advance with Skip to Format Heading" and the applicant of the present invention belongs.

Current high speed printers, operating at print speeds in excess of 800 lines per minute, require a tape or tape advance mechanism that both advances the tape and maintains proper tape tension. Correct tension is required to prevent the ligament from breaking. to prevent a change in gas tension or stress caused by the rapid acceleration and deceleration of the tape, and also to obtain high quality printed output. In addition, a correct match between the control strip and the strip is necessary to ensure aa ^r3 always erfoigt the printing of the Federation or strip in the correct vertical alignment. This is especially important when printing on an invoice, check, ledger sheet, or other form.

In high speed printers, the tape, strip or paper is usually perforated and becomes more pliable in an endless number of sets Pullers captured and moved forward, each puller having pins forcibly inserted into the perforations intervene in the paper. Generally two sets of drawbars are used, one set on each side the print zone, which positively controls the paper as it is advanced through the print zone. Both sets of train directions and the tax strip will be usually driven synchronously, and the information or

009835/1706

Recording on the control strip controls the intermittent Advance of the paper.

To get a high quality print it is necessary to be able to bark the paper tension in print zone one. A rough division of the tension is carried out automatically, since the inevitable engagement of the pulling pins in the paper can be changed from one set of perforations to another set of perforations. However, this is a time-consuming adjustment as it can only be carried out when the machine is at a standstill. The desired adjustments to the paper tension are also usually less than the spacing between adjacent perforations. An example of a fascine that allows fine adjustment of the paper tension is found in U.S. Patent 3,152,742 , owned by the applicant. As the paper is advanced through the printer, the lower drive shaft is rotated differently relative to the upper drive shaft to adjust the paper tension. However, the teaching of this U.S. patent is applied in a printer in which the paper pullers are driven synchronously by a drive shaft, in contrast to the belt driven system of the present invention.

Similarly, to have an exact vertical alignment of the To maintain print lines, it is necessary to establish the correspondence between the control information on your control ^ strip and regulate the paper in the print zone. ™ Here, too, a coarse adjustment is carried out by itself, because the control strip is detached from its drive device and in a slightly different position again Intervention with this can be brought. This process however, the same problems as the coarse adjustment adhere to of the paper tension discussed above, and therefore fine adjustments are desired to be performed can while the machine is working.

00983 5/1706

BATH

High-speed printer that uses a toothed belt to drive the drawbars and thereby advancing the paper, Bind is known in the art. Some of these well known Belt driven printers use separate belts for each set of drawbars, as well as separate belts for the Each set of drawbars connects to a motor while other printers connect a belt to both sets of drawbars and use a second belt that couples the engine to a set of pulling devices. Adjusting these belts to change the paper tension requires separate pairs of pulleys, resulting in sharpness Windings of the belt around the pulleys, as a result of which the belt life is shortened and as a result of the complex The geometric arrangement of the pulleys causes a relatively weak frictional connection. Adjusting the paper tension In these printers, the belts also put additional stress on them, as they often reduce the tension in a segment of the belt is increased without appropriate adjustment to relieve this belt tension. This leads to an expansion of the belt, thereby shortening the service life of the belt and requiring more frequent maintenance of the entire belt Printer system.

The invention is therefore based on the object of a new and improved device for setting the phase relationship of jointly driven rotating shafts and an improved device for adjusting the paper tension to create in a high-speed printer. Furthermore, a device should be provided that the agreement adjusted between the control strip and the paper in a high-speed printer. It is also intended to use a paper tensioning and to create a registration device that is simple having a geometric arrangement or design, thereby a more inevitable control of the paper tension and registration or agreement, less wear and tear and pull on the drive device as well as obtain greater reliability.

009835/1706

The object is achieved by a device of the type indicated at the outset, which is characterized according to the invention by a single flexible drive (33) for a common rotation of both shafts (25, 27), the first and having a second path between the shafts, a device (51, 53) for extending the first path of the drive and for shortening the second path of the drive, one of the shafts being responsive to the lengthening and shortening device and is operable to achieve asynchronous rotation.

The invention hence devices in a system that has a single belt drive, and at least two rotating shafts are provided which extend a segment of the belt and reduce ή another segment of the belt relative to the paths of the belt. The extra length is passed around a shaft from the longer segment to the shorter segment - causing that shaft to rotate a different amount relative to the other shaft. When the rotating shafts are advancing the same material, the result is an adjustment of the location of the material being advanced, and when the shafts are advancing different materials the result is adjustment of registration or correspondence among the materials. The device contains a plate, preferably mounted on a shaft, as well as idle rollers or guide devices, which on the β

Plate are attached. When the plate is rotated, the guide devices displace and thereby effect the belt an elongation and shortening of the corresponding segments of the belt, causing the additional rotation of the one Wave evokes.

The invention will now be described in detail with reference to the accompanying drawings, all of which are taken from the description and the individual discs or

009835/1706

Features can contribute to the solution of the task within the meaning of the invention and with the will to patent in the Registration have been added.

Show it:

Fig. 1 is an overall perspective view of part of a High-speed printer, which is controlled by control information on a strip or tape, and in which the object of the invention is partially illustrated;

Pig. Figure 2 is a side view of a portion of the Pig printer. 1 with the improvement according to the invention;

Figure 3 is a side view of a portion of the Pig printer. 1, the one section of the adjustment device of the Pig. 2 shows in more detail and

Pig. 4 is a cross-sectional view taken along line 4-4 of FIG Fig. 3, which shows the detailed construction of the device described below.

Description of the preferred embodiment

Fig. 1 generally shows the elements of a high-speed printer, which is connected to a data processing system. The paper 11 with an intermediate length is made up of two sets of Drive train devices advanced through the press. The upper set of drive drawbars 13 becomes driven by the square drive shaft 25 and by the Shaft 21 supported. A lower set of drive train assemblies 15 is supported by a similar square drive shaft 27 driven, and the shaft 23 carries the lower drawbars. Each of these four drawbars contains one endless flexible belt carrying paper engaging pins 17. The pins are spaced around each drawbar belt arranged and at the lower left

009835/1706

Drive towing device Ί5 shown. These pens grab in the edge holes or perforations 19 of the paper 11, wherein the pressure plate .14 of each pulling device the paper to ensure that the pins can penetrate. · The position of the four drive pulling devices defines the work zone of the high-speed printer.

The control strip 101, which, as in the aforementioned floating US patent application explained, the paper feed controls, is driven by the pin wheel 99 in synchronism with the paper 11 and carries control information which determines where the paper is to be stopped for printing. A common strip reader 97 converts the information on the control strip 101 into electronic pulses in a known manner. The impulses βteuerη a driving power source (not shown) that the Drives pulley 28, which in turn drives pulley 35 via a drive belt 34. The Y / elle 41 sits in the pin wheel 99 and in a gear 39 · The drive belt 33 driven by the pulley 35 moves the paper and synchronously forward the control strip, as described in detail below.

For the sake of clarity, the drive belt 33 _1, the drive belt 34 and all drive wheels associated with them are shown in FIG. 1 without teeth. It should be noted, however, that the belt and the drive wheels have teeth, as can be seen, for example, in FIG. 2 , and as this is also emphasized in detail in the description, while the idle wheels or rollers have no teeth.

The printing station (not shown) defined by the upper and lower set of drive pullers, consists generally of a known design that has a rotating xrommel-like embossing on one side of the Paper 11 and electromagnetically controlled print hammers are used on the other side of the paper. To get a real one

009835/1706

Pressure su received, the paper 11, if it is between the upper and lower pulling device is located a certain amount Have tension. The paper tension can be adjusted by hand by removing the paper from one of the Set of pulling devices decreases and it moves so that different holes 19 are in contact with pins on each Drawbar come. However, it is desirable to be careful indicated reasons to carry out a finer adjustment of the paper tension. One can see that if either the drive shaft 25 or 27 is rotated somewhat relative to the other shaft, the tension of the paper 11 between the upper one and lower pulling device is affected.

The upper drive pulley 29 has teeth for engaging the toothed belt 33 and the upper square drive-r The shaft 25 sits in the pulley 29. When the drive pulley 29 is rotated by the belt 33, offset them the upper one. Set of drawbars 13 in motion. The lower square drive shaft 27 is seated in a similar manner in the toothed drive pulley 31, and if the drive belt 33 rotates the pulley 31, the lower set of pulling devices 15 is set in motion. Since the belt 33 is assigned to these two drive pulleys together, the upper and lower pairs of pulling devices are synchronized driven.

Pig. Figure 2 shows an end view of the paper tensioning and registration device Ser Fig. 1. To move the paper forward, the belt 33 drives the pulleys 29 and 31, the turn shafts 25 and 27, e.g., in a counterclockwise direction. Sneeze by changing the phase relationship or by bringing the shafts 25 and 27 into the correct phase, there is a corresponding change in the paper tension. According to the invention, a new and improved device is provided for the angular rotation of a shaft in "

009835/1706

To change with respect to the other wave. Even if you do this can perform while the belt 33 is moving or standing still, the principles of the invention will be explained while the belt moves.

Assume that the belt is moving at such a speed that shafts 25 and 27 and pulleys 29 and 31 rotate counterclockwise at a fixed speed of degrees per second. (When CJ = O, it means the paper is stopped). In order to change the phase relationship between shafts 25 and 27, it is necessary to change the amount of rotation of a shaft, e.g. shaft 27, by an amount * ®o * According to the standard formula for rotary movement Q = ujt rotates therefore, during a fixed period of time "t", the shaft 25 _{rotates through an angle Gp 1} = = U) t, and the shaft 27 rotates due to the desired phase shift θ

ί 9 _O

When the paper 11 is advanced by the counterclockwise rotation of the shafts 25 and 27, if θ is counterclockwise, the lower shaft rotates an additional amount G_ relative to the upper shaft and the lower pullers rotate an additional amount G. ₀ relative to the upper drawbars.

As a result, more paper is conveyed into the print zone by the lower pulling devices than is being carried away by the upper pulling devices. This amount is directly proportional to G _Q and the extra paper in the print zone causes less paper tension. The clockwise rotation of the shaft 27, on the other hand, conveys less paper into the print zone

009835/1 706

relative to the speed of the upper access devices, whereby the paper tension is increased.

To bring about this phase shift, a novel pulley arrangement was created by the invention, which is connected to the lower drive shaft 27. The plate 51 is mounted on the shaft 27 so that it is independent rotates from the shaft. The toothed belt is around idle rollers 47 and 49, which are also mounted on the plate 51 33 looped in such a way that the path of the belt from the roller 49 round on the pulley 31 to the roller 47 a Loop forms. To explain the operation of this device, it is assumed that the belt 33 has two segments or sections; the first segment runs from ae Pulley 29 around pulley 47 to pulley 31, and the second segment runs from pulley 29 around around roller 49 to pulley 31. By rotating the plate 51 clockwise, the pressure from the roller 47 is counteracted weakening the first belt segment, making the first segment longer than the web by an amount "X", which it traverses while the corresponding increase in pressure from idler roller 49 against the second belt segment the second segment is shortened by an equal amount "X" compared to the path that this segment traverses.

In response to the clockwise rotation of the plate 51, the drive pulley 31 is driven by the belt 33 rotated clockwise when the length "X" of the. first segment of the belt 33 around the pulley 31 is guided to the second segment of the belt 33. The movement the plate 51 in this direction has the sprinkling, ciie To increase tension in the paper 11, since the rotation of the pulley 31 counteracts the normal rotation for the paper advance. Turning the plate 51 counterclockwise, on the other hand, causes a decrease in the tension of the

00983 5/1706

Paper 11 between the. upper and lower set of drawbars.

Existing paper tensioning devices, which cause an adjustment of the belt segments on both sides of a paper drive wheel, use four idle rollers on a common support which is separate from the drive roller. Adjusting this type of device causes sharp bends in the belt, which shortens its groove life. The exceptionally simplified geometrical shape according to the invention, using only two idle wheels or rollers mounted on the drive shaft, results in greater reliability and a more inevitable response to the rotation of the plate 51. The like

Since the change in the lengths of the two belt sections is the same, there is no change in the tension of the belt between the extremes of disguise. This is desirable to prevent stretching or stretching of the belt. The extremes of displacement which form the limit to which the plate 51 can be rotated must be carefully can be determined to keep the change in belt segment lengths the same. A pin 57 that is in the printer frame 67 is arranged acts with an excessive opening 55 together in the plate 51 in order to limit the rotational movement of the plate 51. Figure 3 illustrates the collaboration between the pin 57 and the periphery of the opening 55, β when the plate 51 is up to the limit of the counterclockwise rotation has been rotated. If this rotation is not sufficient to achieve the required paper tension, aie The machine has stopped, the printing plates 14 are released and the paper 11 is realigned on the pins 17.

Reference will now be made to Figures 2, 3 and 4 for a detailed description of the pulley assembly.

00983 5/1706

The shafts 65 and 65 sit in rollers 47 and 49, respectively. The shafts are mounted on the plate 51. An annular housing is attached to the machine frame 67 coaxially with the drive shaft 27. A ring bearing 61 makes it possible that the plate 51 can be rotated about the axis of the shaft 27 independently of the housing 59 and Rahrren 67. A control shaft 69 contains between its ends a worm gear 71 which engages in teeth 73 of the plate 51. A knob 53 is attached to the shaft 69, and when the knob 53 is turned to rotate the shaft 69, the worm gear 71 cooperates with the teeth to rotate the plate 51. The control shaft 69 is supported in bearing blocks 75 and 77 which are attached to the machine frame. An enlarged portion 79 of the shaft 69 is held against the block 87 by a washer 81 and lock nuts 83 and 85 to prevent any appreciable axial play of the shaft 69.

The lower paper puller drive shaft 27 is in a housing 89 and can rotate independently of the disk. The square hitch drive shaft 27 is in a cylindrical sleeve 87 is inserted to create a round surface which is in contact with the bearings 91. the Drive shaft 27, sleeve 87 and drive pulley 31 are held in a position in which they are rotated by the pin 93 at the same time and smoothly.

It is often desirable to be able to adjust the time 09, to change the amount of torque it takes to rotate the shaft to rotate the plate 51. the Locking nuts 83 and 85 allow adjustment of the friction contact of the shaft 69 on the bearing block 77. An increased Torque is achieved when the ivlutter 83 is tightened, which thereby exerts a force on the side surfaces of the washer exercises. When the desired torque is reached, the nut 85 is tightened against the nut 83 to turn the latter into To lock the installation position.

Q09835 / 1706

The application of the phase change between two rotating shafts is described above using an exemplary embodiment in which the tension is adjusted while the paper advances. However, it is often necessary change the phase setting between two shafts driving different materials. this can be used in machine systems controlled by control strips, e.g. an assembly line or assembly line or in a high-speed printer be the case if, for example, a change in the control or registration or compliance is necessary. Reference is now made again to Fig. 1, from which it can be seen that the drive shaft 41, which rotates the gear 39, drives the pin wheels 99 to advance the control strip 101 forward. Since the belt 33 is connected to the paper feed wheels 29 and 31 and the gear 39 is assigned, the control strip is driven synchronously with the advance of the paper 11.

Referring again to Fig. 2, primed numerals indicate components that make up the same function as their unmarked counterparts haoen (e.g. plate 51 ', -on one of the Belt pulley arrangement is mounted, der'Placce 51 with the pulley arrangement explained above). The gear 39 is together with the rollers 47 'and 49' on the plate 51 'stored. The drive belt 33 is around the roller 47 ', the Drive gear 39 "and the roller 49 * looped around a Form loop, with the drive gear 39 in the Located in the middle of the loop.

The shaft 63 'is seated in the roller 47' and the shaft 65 'is sunk in roller 49 '' and these shafts are mounted on plate 51 '. The shaft 41, which sits in the drive gear 39, iat mounted on the plate 51 ', and the plate 51' is in turn mounted on the frame 67 and can be rotated independently of the shaft 41 will. In a similar way to the related

009835/1706

thus, as described with the idler roller assembly of plate 51, as belt 33 moves counterclockwise, counterclockwise rotation of plate 51 'will effectively move the segment of belt from gear past roller 47' to gear 39 by an amount "X" extends and effectively shortens the segment of belt from drive gear 35 past roller 49 'to drive gear 39 by an equal amount "X". Then, as explained in connection with the rotation of the plate 51, the gear 39 is advanced an additional amount as the change in belt length "X" is around the gear 39, thereby increasing the distance by a phase change ί θ around which the control strip moves, as already explained. The plate 51 * includes an opening ^: _ *, and a limit pin 57 'is fixed in the frame 67 to limit the rotation of the plate 51'. The drive device for rotating the plate 51 * corresponds practically to the drive device for rotating the plate 51. Here a button 53 'is attached to one end of the shaft 69 "and a worm toothing 71' is attached to the opposite end of the shaft. The worm toothing meshes with teeth 73 'in plate 51' to rotate plate 51 'with respect to the center of shaft 41. Bearing blocks 75 * and 77' are attached to frame 67 and shaft 69 * is journalled in these blocks. Lock nuts 83 'and 85' mounted on the shaft keep the shaft aligned and, like lock nuts 83 and 85, can be pitched to vary the amount of torque required to rotate the plate 51 '.

If the imprint is applied to a form, and the If the print lines are too low, for example, it is necessary to print "earlier" with respect to the position of the paper 11. this can be achieved by reading the control strip 101 "earlier", in other words by a phase change

009835/1706

between the paper drive gear 29 and the control strip drive gear 39 takes place. Increasing the rotation of the gear 59 with respect to the gear 29 by an amount _Q moves the control strip III forward an additional amount relative to the synchronous paper advance and causes the control strip information to be read "earlier". This is going through. Turning the plate 51 'counterclockwise causes, as already explained in connection with the plate d1, A clockwise rotation of the plate 51' has the opposite effect in that the control strip is delayed by an amount that is proportional to the phase shift θ, whereby the print lines be lowered.

The invention has been described above in connection with a high-speed printing machine. It will be apparent, however, that a change in the angle of rotation or phase between two rotating shafts, whether or not they are driving the same material, can be provided in any machine in which this puncture is desired.

009835/1706

Claims (1)

Claims Fit device for regulating the phase between two synchronously rotating shafts, characterized by a single flexible drive (33) for a common rotation of both shafts (25, 27), which has a first and second path between the shafts, a device (51, 53 ) for lengthening the first path of the drive and for shortening the second path of the drive, one of the shafts being responsive to the lengthening and shortening device and being actuatable to achieve asynchronous rotation. 2. Apparatus according to claim 1, characterized in that <3 the. .Waves (25, 27) the same Advance the material and the asynchronous rotation adjusts the tension of the material. 3. Apparatus according to claim 1, characterized in that the waves ate different materials synchronously move forward and the asynchronous rotation make the registration or match among the Materials. 4. Apparatus according to claim 1, characterized in that the lengthening and shortening device has the following elements: a plate (51) which on one of the shafts (27) «olugort iat, two idle rollers (47, 49) mounted on the plate are, wherein the drive (33) is looped around the shaft (27) and the idler rollers (47, 49), 009835/1706 as a device (69, 53) for rotating the plate (51). 5. Apparatus according to claim 4, characterized by dadu-rch that the extension and shortening device includes parts (55, 57) that the rotation of the Limit plate (51). Device according to one or more of the preceding claims, in particular printer with feed shafts for Advancing a paper web through a printing station between the shafts, the shafts being driven by a flexible one Drive with two sections are rotatable and with a device for adjusting the tension of the web, characterized by a plate (51) which is mounted on one of the shafts (27), a device (69, 53) for rotating the plate, and by guide devices (47, 49) supported on the plate and engaged with the drive sections, the guide devices being responsive to the disk rotation, to offset the trajectory of each drive section by substantially opposing deflections of the sections are generated to the phase of one web feed shaft (27) with respect to the other web feed shaft (25) to change. Device according to Claim 6, characterized that each of the feed shafts (25, 27) sits in a pulley (29, 31) because the flexible one The drive (33) is looped around each pulley (29, 31) and between the guide devices (47, 49), and that the plate (51) is rotatable coaxially with one of the pulleys (31). 00 9835/1706 8. Device according to one or more of the preceding claims, in particular a machine for moving a material forward through an area and for carrying out operations on the material under the control of a control strip which is normally driven in synchronism with the material by an oiegsame drive with two cutting sections, and with a device for adjusting the registration or match between the strip and the material, characterized by a plate (51 ¹ ) which is mounted on the strip drive (41), a device (53 *, 69 ¹ ) for rotating the plate ( 51 ') and by guide devices (47', 49 ') which are mounted on the plate (5Ϊ) and are in engagement with the drive sections, the guide devices responding to the rotation of the plate to offset the path of the drive sections by substantially opposing deflections are created on the sections to drive the phase of the strip s (41, 99) to change in relation to the material feed (27, 25). Fu / wa 009835/1706