US20190381816A1 - Transmission link assemblies - Google Patents
Transmission link assemblies Download PDFInfo
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- US20190381816A1 US20190381816A1 US16/554,356 US201916554356A US2019381816A1 US 20190381816 A1 US20190381816 A1 US 20190381816A1 US 201916554356 A US201916554356 A US 201916554356A US 2019381816 A1 US2019381816 A1 US 2019381816A1
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- United States
- Prior art keywords
- transmission link
- synchronizing unit
- synchronizing
- transmission
- movement
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J23/00—Power drives for actions or mechanisms
- B41J23/02—Mechanical power drives
- B41J23/025—Mechanical power drives using a single or common power source for two or more functions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
- F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement
Definitions
- a common drive source for example a motor and associated drive gear, can be used to control movement of elements such as printheads, or a printbar comprising printheads.
- multiple transmission links can be provided for controlling movement of the various elements, or for controlling movement of the printbar, whereby the multiple transmission links are controlled by the common drive source.
- FIG. 1 is an example of an assembly according to the disclosure
- FIG. 2 is an example of a synchronizing unit for use with an assembly according to examples described herein;
- FIG. 3 is an example of another assembly according to the disclosure.
- FIG. 4 a is an example of another assembly according to the disclosure.
- FIGS. 4 b and 4 c show further details of the example of FIG. 4 a;
- FIG. 5 shows an example of a method according to the disclosure
- FIG. 6 shows a method according to another example.
- FIG. 1 shows an assembly according to a first example.
- the assembly comprises at least first and second transmission links 10 , each transmission link 10 controlling movement of a respective element 14 coupled to a first side 10 A of the transmission link 10 , under control of a common drive source 16 coupled to a second side 10 B of the transmission link 10 .
- a synchronizing unit 12 is interposed between the first side 10 A and the second side 10 B of each transmission link 10 , to synchronize movement of the respective elements 14 by the common drive source 16 .
- transmission links 10 there are provided three transmission links 10 , labelled 10 1 , 10 2 and 10 N respectively.
- the first and second sides of transmission link 10 1 are labelled 10 1A and 10 1B respectively.
- any plurality of transmission links 10 and corresponding elements 14 may be provided.
- the elements 14 may comprise separate or individual elements whose movement is to be controlled, as shown in FIG. 1 .
- the elements 14 form part of a common element, for example portions or locations on a printbar 14 .
- the synchronizing unit 12 is switchable between a locked mode of operation and an unlocked mode of operation.
- the locked mode of operation the synchronizing unit 12 causes a respective element 14 to move in direct relationship to movement of the transmission link 10 into which the synchronizing unit 12 is interposed.
- the unlocked mode of operation the synchronizing unit 12 allows movement of the first side 10 A of the transmission link 10 relative to the second side 10 B of the transmission link 10 , the relative movement being independent of the common drive source 16 .
- This relative movement in the unlocked mode of operation can compensate, for example, for any differences in functional distance between the common drive source 16 and the respective elements 14 .
- the differences in functional distance, or functional length may be caused for example by dimensional factors such as tolerances of component parts that constitute the transmission system, mechanism plays between component parts, backlash in the transmission system, deflections in various components parts, or other factors.
- the at least first and second transmission links 10 comprise elongated shafts to control linear movement along an axis corresponding to the axis of the elongated shafts.
- a synchronizing unit 12 may comprise a device body 13 comprising a female portion 13 A coupled to one side of the elongated shaft (for example the first side 10 A ), and a male portion 13 B coupled to the other side of the elongated shaft (for example the second side 10 B ).
- a synchronizing unit 12 may comprise a device body 13 comprising a female portion 13 A coupled to one side of the elongated shaft (for example the first side 10 A ), and a male portion 13 B coupled to the other side of the elongated shaft (for example the second side 10 B ).
- the synchronizing unit 12 1 comprises a device body 13 1 comprising a female portion 13 1A coupled to a first side 10 1A of the elongated shaft, and a male portion 13 1B coupled to a second side 10 1B of the elongated shaft.
- a device body 13 1 comprising a female portion 13 1A coupled to a first side 10 1A of the elongated shaft, and a male portion 13 1B coupled to a second side 10 1B of the elongated shaft.
- a synchronizing unit 12 further comprises a biasing element 15 to bias the female and male portions 13 A , 13 B apart.
- the synchronizing unit 12 further comprises a locking member 17 to allow movement of the female portion 13 A relative to the female portion 13 B when the locking member 17 is in an unlocked position, and prevent movement of the female portion 13 A relative to the female portion 13 B when the locking member 17 is in a locked position.
- the synchronizing unit 12 1 comprises a biasing element 151 to bias the female and male portions 13 1A , 13 1B apart.
- the synchronizing unit 12 1 further comprises a locking member 17 1 to allow movement of the female portion 13 1A relative to the male portion 13 1B when the locking member 17 1 is in an unlocked position, and prevent movement of the female portion 13 1A relative to the male portion 13 1B when the locking member 17 1 is in a locked position.
- the female portion 13 A is fixedly coupled to the first side 10 A of the transmission link 10
- the male portion 13 B fixedly coupled to the second side 10 B of the transmission link, or vice versa.
- the female portion 10 1A is fixedly coupled to the first side 10 1A of the transmission link 10
- the male portion 13 1B fixedly coupled to the second side 10 1B of the transmission link.
- references to female and male portions 13 A , 13 B are intended to embrace any structure of parts that cooperate to allow movement relative to one another when the locking member 17 is in the unlocked position, and do not necessarily need one portion to fit within the other during such movement.
- FIG. 1 allows movement of the elements 14 , via control of the common drive source 16 and the transmission links 10 , to be synchronized by the manner in which each synchronizing unit can effectively alter its length to compensate for structural differences or tolerances in the transmission system, such that the elements can be actuated in a coordinated manner.
- the locking members 17 of each of the synchronizing units can be moved to an unlocked position.
- the biasing elements 15 cause the male and female portions of each synchronizing unit 12 to be biased apart.
- the functional length of each transmission link is increased (or decreased in some circumstances) to compensate for different functional distances between each respective element 14 and the common drive source 16 .
- the synchronizing units can be locked, and the calibration mode exited.
- the synchronizing units can all be moved to the unlocked position together or in parallel, adjusted to match the required functional length, and then locked together or in parallel.
- each synchronizing unit can be unlocked, adjusted and locked individually, before moving on to the next synchronizing unit.
- the height of the second element 14 2 (which as shown in this example is greater than the height of the first element 14 1 , thus having a smaller effective functional distance between the element 14 2 and the common drive source 16 ) has acted against the force of the biasing element 15 2 which is trying to bias the female portion 13 2A and male portion 13 2B of the synchronizing unit 12 2 apart, resulting in the functional length of the second transmission link 10 2 being decreased compared to that of the first transmission link 10 1 .
- the height of the third element 14 N (which as shown in this example is less than the height of the first element 14 1 , thus having a larger effective functional distance between the element 14 N and the common drive source 16 ) has resulted in the biasing element 15 N biasing the female portion 13 NA and the male portion 13 NB of the synchronizing unit 12 N apart, resulting in the functional length of the third transmission link 10 N being increased compared to that of the first transmission link 10 1 .
- the synchronizing units 12 act to change or alter the functional lengths of the transmission links which control different elements from a common drive source.
- biasing elements 15 located between the male and female portions of the synchronizing units for biasing them apart
- other biasing element arrangements may also be provided for biasing the male and female portions apart, for example biasing elements arranged to pull the male and female portions apart (or to rotate male and female portions in a rotational synchronizing device described later).
- the biasing elements are strong enough to push or pull the male and female portions one against the other, preloading the whole transmission link by allowing relative movement between the male and female portions.
- the biasing elements are arranged to provide a controlled force, for example a similar or same force to the amount that the transmission link will withstand under normal operating conditions.
- the biasing force may be modified (increased or decreased), for example if the transmission link inertia can affect the positional accuracy of the device due to inertial deflections.
- any form of biasing elements may be used, including for example wire springs (e.g. traction, compression, torsion), or gas cylinders or springs, or hydraulic cylinders, magnets, electric motors (linear or rotational), or other biasing elements that can provide force while allowing relative movement.
- the synchronizing units 12 may also compensate for dimensional differences or tolerances elsewhere in the transmission system, including deflections or deformations when transmission links are working under normal working loads or conditions.
- the synchronizing units effectively provide an adjustable portion within a transmission link, which allows the length of the transmission link to be adjusted to match the functional length needed for a particular transmission link within the overall transmission system.
- the example of FIG. 1 can act to compensate for different distances between the elements 14 and the common drive source 16 , for example caused by different heights of elements 14 , different lengths of transmission links 10 , or other tolerances in the transmission system.
- examples described herein can absorb the positional error sources, including those that stem from rigidity issues.
- the female and male portions 13 A, 13 B may also be provided with different degrees of movement relative to one another when the locking member 17 is in the unlocked position.
- a plurality of bias settings may be provided when the synchronizing unit 12 is operating in the unlocked mode of operation. The plurality of bias settings may be chosen in one example to cater for the different forces experienced in a particular application.
- FIG. 2 shows further details of a synchronizing unit 12 according to one example.
- the synchronizing unit 12 comprises a device body 13 comprising a first portion 13 A (for example a female portion) coupled to a first side 10 A of the transmission link, and a second portion 13 B (for example a male portion) coupled to a second side 10 B of the transmission link 10 .
- the synchronizing unit 12 comprises a biasing element 15 to bias the first and second portions 13 A , 13 B apart.
- the synchronizing unit 12 further comprises a locking member 17 to allow movement of the first portion 13 A relative to the second portion 13 B when the locking member 17 is in an unlocked position, and prevent movement of the first portion 13 A relative to the second portion 13 B when the locking member 17 is in a locked position.
- a locking member 17 allows free movement between male and female portions in the degree of freedom that is being preloaded by means of the biasing element, without interfering in the transmission link length which is being adjusted.
- the design of a locking member takes account of the degree of freedom that needs to be locked.
- a locking member acts to clamp the male and female portions when in the locked position, at any position along their relative movement path.
- the locking members may be controlled manually, or automatically using a control mechanism, or both.
- FIG. 3 shows an assembly according to another example, in which a common element 14 , for example a printbar, is actuated from first and second ends using a common drive source 16 , such as a common motor and associated drive gear.
- a printbar is a beam where the printheads are supported.
- the printbar beam is a mobile part that allows printheads to reach different positions for printing and servicing purposes.
- the assembly of the example of FIG. 3 comprises at least first and second transmission links 10 , each transmission link 10 controlling movement of a respective element 14 coupled to a first side 10 A of the transmission link 10 , under control of a common drive source 16 coupled to a second side 10 B of the transmission link 10 .
- the respective elements whose movement is being controlled, comprise elements that form part of a common element, for example portions or locations on a printbar.
- a synchronizing unit 12 is interposed between the first side 10 A and the second side 10 B of each transmission link 10 , to synchronize movement of the respective elements 14 , for example the orientation of a printbar relative to a printzone 30 , using the common drive source 16 .
- the synchronizing units 12 of FIG. 3 can be operated in a locked and an unlocked mode, with the synchronizing units set to compensate for any differences in functional distance or length when in the unlocked mode, which is then applied when operating in the locked mode. It is noted that additional transmission links may be provided.
- FIG. 3 therefore provides an accurate and coordinated way to move the first and second printbar ends. This enables the printbar to be controlled such that it remains parallel to a printzone 30 , such that printheads coupled to the printbar also remain parallel to the printzone 30 .
- the synchronizing units may be adjusted together, while in other examples they are adjusted individually. In one example the adjustment may be carried out by braking (or locking) the common drive source (e.g. braking and locking the motor), placing the synchronizing units in an unlocked mode, adjusting the transmission links (for example such that the printbar is at a desired orientation, such as parallel to the printzone), placing the synchronizing units in the locked mode, and releasing the common drive source (motor).
- the common drive source e.g. braking and locking the motor
- the synchronizing units are applied in a transmission system involving linear movement.
- the synchronizing units can be applied in a transmission system involving rotational movement.
- FIG. 4 a there is shown a transmission link 10 for controlling movement of a respective element (not shown) coupled to a first side 10 A of the transmission link 10 , under control of a common drive source (not shown) coupled to a second side 10 B of the transmission link 10 , or vice versa.
- Other such transmission links may also be driven by the common drive source, each transmission link controlling movement of an associated element.
- a synchronizing unit (comprising a device body 13 , biasing element 15 and locking member 17 ) is interposed between the first side 10 A and the second side 10 B of the transmission link 10 , to synchronize movement of an element driven by a common drive source, with other elements driven by the common drive source via transmission links 10 similar to that of FIG. 4 a.
- the transmission link in the example of FIG. 4 a comprises a rotatable transmission link to control rotational movement about an axis
- the synchronizing unit comprises a device body comprising a first portion coupled to one side of the rotatable transmission link, and a second portion coupled to the other side of the rotatable transmission link.
- the biasing element biases the first and second portions apart in a rotational direction.
- the locking member allows movement of the first portion relative to the second portion when the locking member is in an unlocked position, and prevents movement of the first portion relative to the second portion when the locking member is in a locked position.
- FIGS. 4 b and 4 c shows further details of a locking member 17 according to the example of FIG. 4 , of the type comprising a fastener, such as a screw 17 A , which cooperates with a slot 17 B .
- FIG. 4 b shows the transmission link 10 adjusted such that the screw 17 A lies towards one end of the slot 17 B (for example when the male and female portions of the transmission link 10 are at the end of one range of their relative movement)
- FIG. 4 c shows the transmission link 10 adjusted such that the screw 17 A lies towards the other end of the slot 17 B (for example when the male and female portions of the transmission link 10 are at the other end of their range of relative movement).
- the screw can be unscrewed to place the locking member in an unlocked mode, to allow movement of the male and female portions of the transmission link 10 , and the screw then tightened when the screw is at the appropriate point along the slot, i.e. when the functional distance is adjusted to the appropriate point by the biasing element(s), to place the locking member in the locked mode.
- the screw can be unscrewed to place the locking member in an unlocked mode, to allow movement of the male and female portions of the transmission link 10 , and the screw then tightened when the screw is at the appropriate point along the slot, i.e. when the functional distance is adjusted to the appropriate point by the biasing element(s), to place the locking member in the locked mode.
- other locking member arrangements can also be used in other examples.
- the synchronizing unit can be operated in an unlocked mode of operation to allow the synchronizing unit to compensate for any differences in functional distance, e.g. rotational distance in this example, in the transmission system.
- the differences in functional distance, or functional length may be caused for example by dimensional factors such as tolerances of component parts that constitute the transmission system, mechanism plays between component parts, backlash in the transmission system, deflections in various components parts, or other factors.
- FIG. 5 shows a method according to another example, to compensate for different functional distances in a transmission system in which movement of at least first and second elements is controlled by a common drive source 16 via at least first and second transmission links.
- the method comprises interposing a synchronizing unit 12 in each of the at least first and second transmission links, as shown in 501 .
- the synchronizing units 12 are adjusted to compensate for variations in functional distance between the common drive source 16 and the respective elements being controlled.
- the method comprises placing synchronizing units into an unlocked mode of operation, in which each synchronizing unit can preload a transmission link where it is interposed, to allow adjustment of the functional distance of the transmission link, 601 , adjusting the functional distances of the transmission links, 603 , and locking the synchronizing units to fix the functional distances previously adjusted, 605 .
- a transmission link may comprise a linear transmission link or a rotatable transmission link.
- the transmission is set and retained in a functional position, and the lock/unlock members released, such that all force generators or biasing elements will place the transmission links under functional stresses, simulating deformations and absorbing all existing plays and backlashes. Then, the lock/unlock members can be locked, holding each transmission link in the functional lengths and position that enable them to work in a coordinated manner under functional conditions.
- a method comprises placing the synchronizing units into an unlocked mode of operation, in which each synchronizing unit expands or contacts to a functional distance of its corresponding transmission, allowing the synchronizing units to settle to the functional distances of their respective transmission links, and locking the synchronizing units to fix the functional distances.
- the examples enable positional error sources to be absorbed, such positional error sources comprising for example functional deformations, variability in dimensional tolerances, or differential rigidities in different components. Therefore, according to at least some examples, an accurate and coordinated movement can be provided
- a mechanism comprises a common mechanical power source that moves more than one element (or different parts of the same element)
- the examples enable such element(s) to be actuated in a more precise coordinated fashion, such that dimensional issues such as tolerances, mechanisms plays, backlash, deflections, etc, can be compensated for.
- the examples described herein allow the synchronizing of the movement of transmissions that transfer power or movement to a number of elements that are to be actuated in a coordinated manner.
- the examples described herein may be used to control movement of a printbar lift mechanism.
- the examples described herein can be used with both linear and rotational movements, for example by interposing an appropriate synchronizing unit in a respective transmission link.
- the synchronizing units may also be used in combination with both linear and rotational movement control.
- a transmission link comprises a fixed functional length when the assembly is operating in a locked mode of operation, and wherein the functional length of the transmission link can be changed when the assembly is operating in an unlocked mode of operation.
- the synchronizing units are structured such that the degree of possible relative movement between first and second portions of a device body of a synchronizing unit is selected to be greater than a possible dimensional tolerance to be compensated for.
- a printer apparatus comprises an assembly or synchronizing unit as described in any of the examples described herein.
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Abstract
Description
- This is a continuation of U.S. application Ser. No. 15/546,335, having a national entry date of Jul. 26, 2017, which is a national stage application under 35 U.S.C. § 371 of PCT/EP2015/058934, filed Apr. 24, 2015, which are both hereby incorporated by reference in their entirety.
- In some printers, a common drive source, for example a motor and associated drive gear, can be used to control movement of elements such as printheads, or a printbar comprising printheads. In such examples, multiple transmission links can be provided for controlling movement of the various elements, or for controlling movement of the printbar, whereby the multiple transmission links are controlled by the common drive source.
- Examples will now be described, by way of non-limiting example, with reference to the accompanying drawings, in which:
-
FIG. 1 is an example of an assembly according to the disclosure; -
FIG. 2 is an example of a synchronizing unit for use with an assembly according to examples described herein; -
FIG. 3 is an example of another assembly according to the disclosure; -
FIG. 4a is an example of another assembly according to the disclosure; -
FIGS. 4b and 4c show further details of the example ofFIG. 4 a; -
FIG. 5 shows an example of a method according to the disclosure; and -
FIG. 6 shows a method according to another example. -
FIG. 1 shows an assembly according to a first example. The assembly comprises at least first andsecond transmission links 10, eachtransmission link 10 controlling movement of arespective element 14 coupled to afirst side 10 A of thetransmission link 10, under control of acommon drive source 16 coupled to asecond side 10 B of thetransmission link 10. A synchronizingunit 12 is interposed between thefirst side 10 A and thesecond side 10 B of eachtransmission link 10, to synchronize movement of therespective elements 14 by thecommon drive source 16. - In the example shown, there are provided three
transmission links 10, labelled 10 1, 10 2 and 10 N respectively. The first and second sides oftransmission link 10 1, for example, are labelled 10 1A and 10 1B respectively. It is noted that any plurality oftransmission links 10 andcorresponding elements 14 may be provided. Theelements 14 may comprise separate or individual elements whose movement is to be controlled, as shown inFIG. 1 . In another example (which will be described later inFIG. 3 ) theelements 14 form part of a common element, for example portions or locations on aprintbar 14. - In one example, the synchronizing
unit 12 is switchable between a locked mode of operation and an unlocked mode of operation. In the locked mode of operation the synchronizingunit 12 causes arespective element 14 to move in direct relationship to movement of thetransmission link 10 into which the synchronizingunit 12 is interposed. In the unlocked mode of operation the synchronizingunit 12 allows movement of thefirst side 10 A of thetransmission link 10 relative to thesecond side 10 B of thetransmission link 10, the relative movement being independent of thecommon drive source 16. This relative movement in the unlocked mode of operation can compensate, for example, for any differences in functional distance between thecommon drive source 16 and therespective elements 14. - The differences in functional distance, or functional length, may be caused for example by dimensional factors such as tolerances of component parts that constitute the transmission system, mechanism plays between component parts, backlash in the transmission system, deflections in various components parts, or other factors.
- In the example of
FIG. 1 , the at least first andsecond transmission links 10 comprise elongated shafts to control linear movement along an axis corresponding to the axis of the elongated shafts. In such an example a synchronizingunit 12 may comprise adevice body 13 comprising afemale portion 13 A coupled to one side of the elongated shaft (for example the first side 10 A), and amale portion 13 B coupled to the other side of the elongated shaft (for example the second side 10 B). For example, for thefirst transmission link 10 1 ofFIG. 1 , the synchronizingunit 12 1 comprises adevice body 13 1 comprising afemale portion 13 1A coupled to afirst side 10 1A of the elongated shaft, and amale portion 13 1B coupled to asecond side 10 1B of the elongated shaft. The same applies to theother transmission links FIG. 1 . - In the example of
FIG. 1 , a synchronizingunit 12 further comprises a biasingelement 15 to bias the female andmale portions unit 12 further comprises alocking member 17 to allow movement of thefemale portion 13 A relative to thefemale portion 13 B when thelocking member 17 is in an unlocked position, and prevent movement of thefemale portion 13 A relative to thefemale portion 13 B when thelocking member 17 is in a locked position. For example, for thefirst transmission link 10 1 ofFIG. 1 , the synchronizingunit 12 1 comprises abiasing element 151 to bias the female andmale portions unit 12 1 further comprises alocking member 17 1 to allow movement of thefemale portion 13 1A relative to themale portion 13 1B when thelocking member 17 1 is in an unlocked position, and prevent movement of thefemale portion 13 1A relative to themale portion 13 1B when thelocking member 17 1 is in a locked position. The same applies to theother transmission links FIG. 1 . - In one example the
female portion 13 A is fixedly coupled to thefirst side 10 A of thetransmission link 10, and themale portion 13 B fixedly coupled to thesecond side 10 B of the transmission link, or vice versa. For example, for thefirst transmission link 10 1 ofFIG. 1 thefemale portion 10 1A is fixedly coupled to thefirst side 10 1A of thetransmission link 10, and themale portion 13 1B fixedly coupled to thesecond side 10 1B of the transmission link. It is noted that references to female andmale portions locking member 17 is in the unlocked position, and do not necessarily need one portion to fit within the other during such movement. - The example of
FIG. 1 allows movement of theelements 14, via control of thecommon drive source 16 and thetransmission links 10, to be synchronized by the manner in which each synchronizing unit can effectively alter its length to compensate for structural differences or tolerances in the transmission system, such that the elements can be actuated in a coordinated manner. - During a calibration mode of operation, for example, the
locking members 17 of each of the synchronizing units can be moved to an unlocked position. When thelocking members 17 are in the unlocked position, thebiasing elements 15 cause the male and female portions of each synchronizingunit 12 to be biased apart. As such, the functional length of each transmission link is increased (or decreased in some circumstances) to compensate for different functional distances between eachrespective element 14 and thecommon drive source 16. After a settling period during the unlocked stage of the calibration mode, e.g. after the synchronizing units have adjusted to the different functional distances, the synchronizing units can be locked, and the calibration mode exited. In one example the synchronizing units can all be moved to the unlocked position together or in parallel, adjusted to match the required functional length, and then locked together or in parallel. In another example, each synchronizing unit can be unlocked, adjusted and locked individually, before moving on to the next synchronizing unit. - In the example of
FIG. 1 , it can be seen that the height of the second element 14 2 (which as shown in this example is greater than the height of thefirst element 14 1, thus having a smaller effective functional distance between theelement 14 2 and the common drive source 16) has acted against the force of thebiasing element 15 2 which is trying to bias thefemale portion 13 2A andmale portion 13 2B of the synchronizingunit 12 2 apart, resulting in the functional length of thesecond transmission link 10 2 being decreased compared to that of thefirst transmission link 10 1. Also in this example, it can be seen that the height of the third element 14 N (which as shown in this example is less than the height of thefirst element 14 1, thus having a larger effective functional distance between theelement 14 N and the common drive source 16) has resulted in thebiasing element 15 N biasing thefemale portion 13 NA and themale portion 13 NB of the synchronizingunit 12 N apart, resulting in the functional length of thethird transmission link 10 N being increased compared to that of thefirst transmission link 10 1. In this way, according to some examples the synchronizingunits 12 act to change or alter the functional lengths of the transmission links which control different elements from a common drive source. - It is noted that although the example of
FIG. 1 shows biasingelements 15 located between the male and female portions of the synchronizing units for biasing them apart, other biasing element arrangements may also be provided for biasing the male and female portions apart, for example biasing elements arranged to pull the male and female portions apart (or to rotate male and female portions in a rotational synchronizing device described later). In some examples the biasing elements are strong enough to push or pull the male and female portions one against the other, preloading the whole transmission link by allowing relative movement between the male and female portions. In some examples the biasing elements are arranged to provide a controlled force, for example a similar or same force to the amount that the transmission link will withstand under normal operating conditions. In some example the biasing force may be modified (increased or decreased), for example if the transmission link inertia can affect the positional accuracy of the device due to inertial deflections. It is noted that any form of biasing elements may be used, including for example wire springs (e.g. traction, compression, torsion), or gas cylinders or springs, or hydraulic cylinders, magnets, electric motors (linear or rotational), or other biasing elements that can provide force while allowing relative movement. - It is also noted that although the example of
FIG. 1 is shown as compensating for differences in the dimensions of theelements 14, the synchronizingunits 12 may also compensate for dimensional differences or tolerances elsewhere in the transmission system, including deflections or deformations when transmission links are working under normal working loads or conditions. - In the examples described herein, the synchronizing units effectively provide an adjustable portion within a transmission link, which allows the length of the transmission link to be adjusted to match the functional length needed for a particular transmission link within the overall transmission system.
- Thus, the example of
FIG. 1 can act to compensate for different distances between theelements 14 and thecommon drive source 16, for example caused by different heights ofelements 14, different lengths oftransmission links 10, or other tolerances in the transmission system. For example, if the different transmission links have very different lengths through different rigidities or tolerances, examples described herein can absorb the positional error sources, including those that stem from rigidity issues. - In some examples, the female and
male portions locking member 17 is in the unlocked position. For example, a plurality of bias settings may be provided when the synchronizingunit 12 is operating in the unlocked mode of operation. The plurality of bias settings may be chosen in one example to cater for the different forces experienced in a particular application. -
FIG. 2 shows further details of a synchronizingunit 12 according to one example. As withFIG. 1 , the synchronizingunit 12 comprises adevice body 13 comprising a first portion 13 A (for example a female portion) coupled to afirst side 10A of the transmission link, and asecond portion 13B (for example a male portion) coupled to asecond side 10 B of thetransmission link 10. The synchronizingunit 12 comprises a biasingelement 15 to bias the first andsecond portions unit 12 further comprises a lockingmember 17 to allow movement of thefirst portion 13 A relative to thesecond portion 13 B when the lockingmember 17 is in an unlocked position, and prevent movement of thefirst portion 13 A relative to thesecond portion 13 B when the lockingmember 17 is in a locked position. In one example a lockingmember 17 allows free movement between male and female portions in the degree of freedom that is being preloaded by means of the biasing element, without interfering in the transmission link length which is being adjusted. In one example the design of a locking member takes account of the degree of freedom that needs to be locked. In some examples, a locking member acts to clamp the male and female portions when in the locked position, at any position along their relative movement path. - The locking members may be controlled manually, or automatically using a control mechanism, or both.
- From the above it can be seen that, for a multilink transmission system which moves different elements in a coordinated manner with one source of power, by means of the examples described herein an accurate and coordinated or synchronized movement can be obtained.
-
FIG. 3 shows an assembly according to another example, in which acommon element 14, for example a printbar, is actuated from first and second ends using acommon drive source 16, such as a common motor and associated drive gear. A printbar is a beam where the printheads are supported. The printbar beam is a mobile part that allows printheads to reach different positions for printing and servicing purposes. - The assembly of the example of
FIG. 3 comprises at least first and second transmission links 10, eachtransmission link 10 controlling movement of arespective element 14 coupled to afirst side 10 A of thetransmission link 10, under control of acommon drive source 16 coupled to asecond side 10 B of thetransmission link 10. In this example the respective elements, whose movement is being controlled, comprise elements that form part of a common element, for example portions or locations on a printbar. A synchronizingunit 12 is interposed between thefirst side 10 A and thesecond side 10B of eachtransmission link 10, to synchronize movement of therespective elements 14, for example the orientation of a printbar relative to a printzone 30, using thecommon drive source 16. - As with the example of
FIG. 1 , the synchronizingunits 12 ofFIG. 3 can be operated in a locked and an unlocked mode, with the synchronizing units set to compensate for any differences in functional distance or length when in the unlocked mode, which is then applied when operating in the locked mode. It is noted that additional transmission links may be provided. - The example of
FIG. 3 therefore provides an accurate and coordinated way to move the first and second printbar ends. This enables the printbar to be controlled such that it remains parallel to a printzone 30, such that printheads coupled to the printbar also remain parallel to the printzone 30. As mentioned above inFIG. 1 , in some examples the synchronizing units may be adjusted together, while in other examples they are adjusted individually. In one example the adjustment may be carried out by braking (or locking) the common drive source (e.g. braking and locking the motor), placing the synchronizing units in an unlocked mode, adjusting the transmission links (for example such that the printbar is at a desired orientation, such as parallel to the printzone), placing the synchronizing units in the locked mode, and releasing the common drive source (motor). - In the examples of
FIGS. 1 to 3 the synchronizing units are applied in a transmission system involving linear movement. In other examples, such as that illustrated inFIG. 4a , the synchronizing units can be applied in a transmission system involving rotational movement. - In
FIG. 4a , there is shown atransmission link 10 for controlling movement of a respective element (not shown) coupled to afirst side 10 A of thetransmission link 10, under control of a common drive source (not shown) coupled to asecond side 10 B of thetransmission link 10, or vice versa. Other such transmission links may also be driven by the common drive source, each transmission link controlling movement of an associated element. A synchronizing unit (comprising adevice body 13, biasingelement 15 and locking member 17) is interposed between thefirst side 10 A and thesecond side 10 B of thetransmission link 10, to synchronize movement of an element driven by a common drive source, with other elements driven by the common drive source viatransmission links 10 similar to that ofFIG. 4 a. - Thus, the transmission link in the example of
FIG. 4a comprises a rotatable transmission link to control rotational movement about an axis, and wherein the synchronizing unit comprises a device body comprising a first portion coupled to one side of the rotatable transmission link, and a second portion coupled to the other side of the rotatable transmission link. The biasing element biases the first and second portions apart in a rotational direction. The locking member allows movement of the first portion relative to the second portion when the locking member is in an unlocked position, and prevents movement of the first portion relative to the second portion when the locking member is in a locked position. -
FIGS. 4b and 4c shows further details of a lockingmember 17 according to the example ofFIG. 4 , of the type comprising a fastener, such as ascrew 17 A, which cooperates with aslot 17 B.FIG. 4b shows thetransmission link 10 adjusted such that thescrew 17 A lies towards one end of the slot 17 B (for example when the male and female portions of thetransmission link 10 are at the end of one range of their relative movement), whileFIG. 4c shows thetransmission link 10 adjusted such that thescrew 17 A lies towards the other end of the slot 17 B (for example when the male and female portions of thetransmission link 10 are at the other end of their range of relative movement). In this example the screw can be unscrewed to place the locking member in an unlocked mode, to allow movement of the male and female portions of thetransmission link 10, and the screw then tightened when the screw is at the appropriate point along the slot, i.e. when the functional distance is adjusted to the appropriate point by the biasing element(s), to place the locking member in the locked mode. It is noted that other locking member arrangements can also be used in other examples. - Thus, as with the examples of
FIGS. 1 to 3 , the synchronizing unit can be operated in an unlocked mode of operation to allow the synchronizing unit to compensate for any differences in functional distance, e.g. rotational distance in this example, in the transmission system. The differences in functional distance, or functional length, may be caused for example by dimensional factors such as tolerances of component parts that constitute the transmission system, mechanism plays between component parts, backlash in the transmission system, deflections in various components parts, or other factors. -
FIG. 5 shows a method according to another example, to compensate for different functional distances in a transmission system in which movement of at least first and second elements is controlled by acommon drive source 16 via at least first and second transmission links. The method comprises interposing a synchronizingunit 12 in each of the at least first and second transmission links, as shown in 501. During a calibration mode ofoperation 503, the synchronizingunits 12 are adjusted to compensate for variations in functional distance between thecommon drive source 16 and the respective elements being controlled. - Referring to
FIG. 6 , in one example, the method comprises placing synchronizing units into an unlocked mode of operation, in which each synchronizing unit can preload a transmission link where it is interposed, to allow adjustment of the functional distance of the transmission link, 601, adjusting the functional distances of the transmission links, 603, and locking the synchronizing units to fix the functional distances previously adjusted, 605. - In the methods of
FIG. 5 or 6 , a transmission link may comprise a linear transmission link or a rotatable transmission link. - In some examples the transmission is set and retained in a functional position, and the lock/unlock members released, such that all force generators or biasing elements will place the transmission links under functional stresses, simulating deformations and absorbing all existing plays and backlashes. Then, the lock/unlock members can be locked, holding each transmission link in the functional lengths and position that enable them to work in a coordinated manner under functional conditions.
- In another example, a method comprises placing the synchronizing units into an unlocked mode of operation, in which each synchronizing unit expands or contacts to a functional distance of its corresponding transmission, allowing the synchronizing units to settle to the functional distances of their respective transmission links, and locking the synchronizing units to fix the functional distances.
- By means of some examples described above, when a multilink transmission system, for example in a printer, has to move different elements in a coordinated manner using a common source of power, the examples enable positional error sources to be absorbed, such positional error sources comprising for example functional deformations, variability in dimensional tolerances, or differential rigidities in different components. Therefore, according to at least some examples, an accurate and coordinated movement can be provided
- Thus, when a mechanism comprises a common mechanical power source that moves more than one element (or different parts of the same element), the examples enable such element(s) to be actuated in a more precise coordinated fashion, such that dimensional issues such as tolerances, mechanisms plays, backlash, deflections, etc, can be compensated for.
- The examples described herein allow the synchronizing of the movement of transmissions that transfer power or movement to a number of elements that are to be actuated in a coordinated manner. For example, the examples described herein may be used to control movement of a printbar lift mechanism.
- The examples described herein can be used with both linear and rotational movements, for example by interposing an appropriate synchronizing unit in a respective transmission link. The synchronizing units may also be used in combination with both linear and rotational movement control.
- In some examples, a transmission link comprises a fixed functional length when the assembly is operating in a locked mode of operation, and wherein the functional length of the transmission link can be changed when the assembly is operating in an unlocked mode of operation.
- In some examples, the synchronizing units are structured such that the degree of possible relative movement between first and second portions of a device body of a synchronizing unit is selected to be greater than a possible dimensional tolerance to be compensated for.
- In one example, a printer apparatus comprises an assembly or synchronizing unit as described in any of the examples described herein.
- The word “comprising” does not exclude the presence of elements other than those listed in a claim, “a” or “an” does not exclude a plurality, and a single processor or other unit may fulfil the functions of several units recited in the claims.
- The features of any dependent claim may be combined with the features of any of the independent claims or other dependent claims.
Claims (19)
Priority Applications (1)
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US16/554,356 US20190381816A1 (en) | 2015-04-24 | 2019-08-28 | Transmission link assemblies |
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PCT/EP2015/058934 WO2016169619A1 (en) | 2015-04-24 | 2015-04-24 | Transmission link assemblies |
US201715546335A | 2017-07-26 | 2017-07-26 | |
US16/554,356 US20190381816A1 (en) | 2015-04-24 | 2019-08-28 | Transmission link assemblies |
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US15/546,335 Division US10464356B2 (en) | 2015-04-24 | 2015-04-24 | Transmission link assemblies |
PCT/EP2015/058934 Division WO2016169619A1 (en) | 2015-04-24 | 2015-04-24 | Transmission link assemblies |
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US20190381816A1 true US20190381816A1 (en) | 2019-12-19 |
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Citations (1)
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US20120325613A1 (en) * | 2011-06-24 | 2012-12-27 | Hon Hai Precision Industry Co., Ltd. | Clutch assembly |
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JPS59116951U (en) | 1983-01-25 | 1984-08-07 | 京セラミタ株式会社 | Copy machine power transmission device |
US5172137A (en) * | 1990-11-30 | 1992-12-15 | Kanzaki Paper Manufacturing Co., Ltd. | Thermal printer |
JPH07256978A (en) | 1994-03-25 | 1995-10-09 | Sato:Kk | Thermal printer |
JPH0899739A (en) * | 1994-10-03 | 1996-04-16 | Canon Inc | Sheet carrying mechanism and image recording and reading device employing the sheet carrying mechanism |
US5584207A (en) * | 1995-03-20 | 1996-12-17 | Hewlett-Packard Company | Integrated drive system |
US6160786A (en) * | 1998-03-20 | 2000-12-12 | Hewlett-Packard Company | Cartridge engaging assembly with rack drive thumb actuator system |
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US6394672B1 (en) * | 2000-07-14 | 2002-05-28 | Lexmark International, Inc | Imaging apparatus having a biased platen |
KR100419220B1 (en) * | 2002-01-02 | 2004-02-21 | 삼성전자주식회사 | apparatus for adjusting a head gap in an inkjet printer |
US6736557B2 (en) * | 2002-09-05 | 2004-05-18 | Lexmark International, Inc. | Printhead gap adjustment mechanism for an imaging apparatus |
AT413472B (en) * | 2004-08-16 | 2006-03-15 | Blum Gmbh Julius | EJECTION DEVICE FOR A MOVABLE FURNITURE PART |
JP4862754B2 (en) | 2007-06-12 | 2012-01-25 | セイコーエプソン株式会社 | Fluid ejecting apparatus and cap drive control method |
US8500345B2 (en) | 2009-12-30 | 2013-08-06 | Pitney Bowes Inc. | Item handling system with printer alignment |
JP5488314B2 (en) | 2010-08-03 | 2014-05-14 | 株式会社リコー | Image forming apparatus |
US8353566B2 (en) * | 2010-09-17 | 2013-01-15 | Hewlett-Packard Development Company, L.P. | Print bar lift |
US8430585B2 (en) * | 2010-09-17 | 2013-04-30 | Hewlett-Packard Development Company, L.P. | Print bar lift and method |
DE102010060405B4 (en) | 2010-11-08 | 2017-08-31 | Océ Printing Systems GmbH & Co. KG | Device for positioning at least one printing bar in printing position in an ink printing device |
US8888211B2 (en) * | 2012-07-19 | 2014-11-18 | Hewlett-Packard Development Company, L.P. | Printing device |
US20140352486A1 (en) * | 2013-05-30 | 2014-12-04 | Hewlett-Packard Development Company, L.P. | Positioning assemblies |
US9242493B2 (en) * | 2013-11-15 | 2016-01-26 | Memjet Technology Ltd. | Printer assembly having liftable carriage and external datum arrangement |
WO2016170383A1 (en) * | 2015-04-24 | 2016-10-27 | Hewlett-Packard Development Company, L.P. | Print bar for a multi-pass printer and multi-pass page-wide-array printer |
US10060767B2 (en) * | 2016-04-22 | 2018-08-28 | Hewlett-Packard Development Company, L.P. | Rotary apparatus |
JP6850552B2 (en) * | 2016-05-27 | 2021-03-31 | 理想科学工業株式会社 | Inkjet printing equipment |
-
2015
- 2015-04-24 WO PCT/EP2015/058934 patent/WO2016169619A1/en active Application Filing
- 2015-04-24 US US15/546,335 patent/US10464356B2/en active Active
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2019
- 2019-08-28 US US16/554,356 patent/US20190381816A1/en not_active Abandoned
Patent Citations (1)
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US20120325613A1 (en) * | 2011-06-24 | 2012-12-27 | Hon Hai Precision Industry Co., Ltd. | Clutch assembly |
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US10464356B2 (en) | 2019-11-05 |
US20180022121A1 (en) | 2018-01-25 |
WO2016169619A1 (en) | 2016-10-27 |
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