EP0352075A2 — Device for magnifying displacement of piezoelectr…

Claim 1

Independent Claim 239 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one portion to said movable member and disposed in opposed relationship to said first leaf spring; a rocking member fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and adapted to be rocked by flexing of said first and second leaf springs to be generated by the displacement of said piezoelectric element; a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; and a quadri-hinged parallel link mechanism fixed to said movable member and the other end of said sub frame, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element.

Claim 2

Independent Claim 239 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one portion to said movable member and disposed in opposed relationship to said first leaf spring; a rocking member fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and adapted to be rocked by flexing of said first and second leaf springs to be generated by the displacement of said piezoelectric element; a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; and a quadri-hinged parallel link mechanism fixed to said movable member and the other end of said sub frame, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element.

Claim 3

Dependent Claim 17 words

The device as defined in claim 1, wherein said piezoelectric element is formed of stacked piezoelectric ceramics.

Claim 4

Dependent Claim 41 words

The device as defined in claim 1 or 2, wherein said main frame is formed of a substantially rectangular metal plate having a predetermined thickness and extends in a direction substantially parallel to the direction of displacement of said piezoelectric element.

Claim 5

Dependent Claim 69 words

The device as defined in claim 1, 2 or 3 further comprising a temperature compensating member and a preload member both interposed between said piezoelectric element and said lateral projection, said temperature compensating member having a characteristic of temperature-linear expansion contrary to that of said piezoelectric element, said preload member serving to apply a given compression load to said piezoelectric element in a rest position of said piezoelectric element.

Claim 6

Independent Claim 30 words

The device as defined in any one of claims 1 to 4 wherein said main frame and said sub frame are integrally formed with each other through said lateral projection.

Claim 7

Independent Claim 208 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one portion to said movable member and disposed in opposed relationship to said first leaf spring; and a rocking member fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and adapted to be rocked by flexing of said first and second leaf springs to be generated by the displacement of said piezoelectric element; wherein said first and second leaf springs are formed with first and second elastically deformable portions, respectively, and said second elastically deformable portion of said second leaf spring has a rigidity greater than that of said first elastically deformable portion of said first leaf spring.

Claim 8

Independent Claim 208 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one portion to said movable member and disposed in opposed relationship to said first leaf spring; and a rocking member fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and adapted to be rocked by flexing of said first and second leaf springs to be generated by the displacement of said piezoelectric element; wherein said first and second leaf springs are formed with first and second elastically deformable portions, respectively, and said second elastically deformable portion of said second leaf spring has a rigidity greater than that of said first elastically deformable portion of said first leaf spring.

Claim 9

Dependent Claim 31 words

The device as defined in claim 6, wherein said second elastically deformable portion of said second leaf spring is thicker than said first elastically deformable portion of said first leaf spring.

Claim 10

Dependent Claim 31 words

The device as defined in claim 6 or 7 wherein said first and second leaf springs have a width greater than a thickness of said main frame and said movable member.

Claim 11

Dependent Claim 21 words

The device as defined in claim 6,7 or 8 wherein said first and second leaf springs are spaced a predetermined clearance.

Claim 12

Independent Claim 26 words

The device as defined in any one of claims 1 to 5 wherein said first and second leaf springs are integrally formed with said rocking member.

Claim 13

Dependent Claim 33 words

The device as defined in claim 6,7,8 or 9 wherein said first and second leaf springs are recessed at their outer side surfaces to form said first and second elastically deformable portions, respectively.

Claim 14

Independent Claim 33 words

The device as defined in any one of claims 1 to 5, wherein said quadri-hinged parallel link mechanism comprises a pair of link plates and a bridge portion for bridging said link plates.

Claim 15

Dependent Claim 65 words

The device as defined in claim 12, wherein each of said link plates comprises a pair of parallel vertical portions fixed to a side surface of said sub frame and a side surface of said movable member, a pair of parallel horizontal portions extending between said parallel vertical portions, and four elastically deformable hinge portions connecting said parallel vertical portions with said parallel horizontal portions.

Claim 16

Independent Claim 188 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection at its one end for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said main frame for magnifying the displacement of said piezoelectric element; a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; a link member fixed to said movable member and the other end of said sub frame; and a connecting plate fixed at its one end portion to the other end of said main frame and at the other end portion to the other end of said sub frame.

Claim 17

Independent Claim 188 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection at its one end for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said main frame for magnifying the displacement of said piezoelectric element; a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; a link member fixed to said movable member and the other end of said sub frame; and a connecting plate fixed at its one end portion to the other end of said main frame and at the other end portion to the other end of said sub frame.

Claim 18

Dependent Claim 17 words

The device as defined in claim 14, wherein said link member comprises a quadri-hinged parallel link mechanism.

Claim 19

Dependent Claim 31 words

The device as defined in claim 14 or 15 wherein said connecting plate extends horizontally from the other end of said sub frame to the other end of said main frame.

Claim 20

Dependent Claim 65 words

The device as defined in claim 15, wherein said quadri-hinged parallel link mechanism comprises a pair of parallel vertical portions fixed to a side surface of said sub frame and a side surface of said movable member, a pair of parallel horizontal portions extending between said parallel vertical portions, and four elastically deformable hinge portions connecting said parallel vertical portions with said parallel horizontal portions.

Claim 21

Dependent Claim 41 words

The device as defined in claim 15, 16 or 17 wherein said main frame, said movable member and said sub frame have a reduced thickness at a portion where said quadri-hinged parallel link mechanism and said connecting plates are fixedly mounted.

Claim 22

Dependent Claim 41 words

The device as defined in claim 13, wherein said sub frame has a thin-walled portion at a position where said parallel horizontal portions and said hinge portions are disposed, so as not to contact opposite side surfaces of said thin-walled portion.

Claim 23

Dependent Claim 46 words

The device as defined in claim 11, wherein said movable member is formed with a neck portion having a rigidity greater than that of said second elastically deformable portion and adapted to be elastically expanded and contracted in the direction of displacement of said piezoelectric element.

Claim 24

Independent Claim 211 words

A method of producing a device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a first step of forming an integral frame body having a main frame extending along one side of said piezoelectric element, a supporting portion for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element, a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element, and a sub frame extending along the other side of said piezoelectric element opposite to said main frame; a second step of fixing a pair of leaf springs connected at one end with a rocking member to said main frame and said movable member; a third step of forming a first parting slit between said main frame and said movable member and a second parting slit between said movable member and said sub frame to separate said main frame, said movable member and said sub frame; a fourth step of fixing a quadri-hinged parallel link mechanism between said movable member and said sub frame; and a fifth step of fixing said piezoelectric element between said supporting portion and said movable member.

Claim 25

Independent Claim 211 words

A method of producing a device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a first step of forming an integral frame body having a main frame extending along one side of said piezoelectric element, a supporting portion for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element, a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element, and a sub frame extending along the other side of said piezoelectric element opposite to said main frame; a second step of fixing a pair of leaf springs connected at one end with a rocking member to said main frame and said movable member; a third step of forming a first parting slit between said main frame and said movable member and a second parting slit between said movable member and said sub frame to separate said main frame, said movable member and said sub frame; a fourth step of fixing a quadri-hinged parallel link mechanism between said movable member and said sub frame; and a fifth step of fixing said piezoelectric element between said supporting portion and said movable member.

Claim 26

Dependent Claim 41 words

The method as defined in claim 21, wherein said first step comprises injection-molding a mixture of metal powder and resin, heating a molding obtained above at a predetermined temperature, and sintering the molding at a predetermined temperature in an atmospheric gas.

Claim 27

Dependent Claim 27 words

The method as defined in claim 21 or 22 wherein said first step includes formation of a recess for inserting the other end of said leaf springs.

Claim 28

Dependent Claim 38 words

The method as defined in claim 21, 22 or 23 wherein said first step includes formation of thin-walled portions of said movable member and said sub frame at a position where said quadri-hinged parallel link mechanism is fixed.

Claim 29

Independent Claim 26 words

The method as defined in any one of claims 21 to 24 further comprising a step of integrally forming said leaf springs with said rocking member.

Claim 30

Dependent Claim 36 words

The method as defined in claim 25 further comprising a step of fixing said rocking member to one end of a rocking arm and fixing the other end of said rocking arm to a printing wire.

Claim 31

Independent Claim 26 words

The method as defined in any one of claims 21 to 26 wherein said leaf springs are brazed to said main frame and said moveable member.

Claim 32

Independent Claim 28 words

The method as defined in any one of claims 21 to 27 wherein said quadri-hinged parallel link mechanism is welded to said movable member and said sub frame.

Claim 33

Independent Claim 29 words

The method as defined in any one of claims 21 to 28 wherein said first and second parting slits are formed by laser cutting or wire-cut electrical discharge cutting.

Claim 34

Independent Claim 75 words

The method as defined in any one of claims 21 to 29 wherein said quadri-hinged parallel link mechanism comprises a pair of opposed parallel link plates and a bridge portion integrally connecting said parallel link plates, and said fourth step further comprises a step of mounting said parallel link plates on opposite side surfaces of said movable member and opposite side surfaces of said sub frame and a step of positioning said parallel link plates.

Claim 35

Independent Claim 65 words

The method as defined in any one of claims 21 to 30 further comprising a step of interposing between said supporting portion and said piezoelectric element a preload member for applying a given compression load to said piezoelectric element in a rest position of said piezoelectric element and a temperature compensating member having a characteristic of temperature-linear expansion contrary to that of said piezoelectric element.

Claim 36

Dependent Claim 73 words

The method as defined in claim 31, wherein said preload member has an inverted U-shaped configuration composed of an upper plate portion and a pair of side plate portions, and said interposing step comprises fixing said temperature compensating member to one end of said piezoelectric element, movably mounting said preload member on said supporting portion, and fixing said side plate portions of said preload member to opposite side surfaces of said supporting portion.

Claim 37

Independent Claim 211 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one end portion to said movable member and disposed in opposed relationship to said first leaf spring; a rocking arm connected at its one end with the other ends of said first and second leaf springs and extending in a direction substantially perpendicular to the direction of displacement of said piezoelectric element, said rocking arm being rockable by flexing of said first and second leaf springs; a first stopper member for restricting flexing of said rocking arm upon cutting of the application of voltage to said piezoelectric element; and a second stopper member for restricting flexing of said second leaf spring upon cutting of the application of voltage to said piezoelectric element.

Claim 38

Independent Claim 211 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; a first leaf spring fixed at its one end portion to said main frame; a second leaf spring fixed at its one end portion to said movable member and disposed in opposed relationship to said first leaf spring; a rocking arm connected at its one end with the other ends of said first and second leaf springs and extending in a direction substantially perpendicular to the direction of displacement of said piezoelectric element, said rocking arm being rockable by flexing of said first and second leaf springs; a first stopper member for restricting flexing of said rocking arm upon cutting of the application of voltage to said piezoelectric element; and a second stopper member for restricting flexing of said second leaf spring upon cutting of the application of voltage to said piezoelectric element.

Claim 39

Dependent Claim 104 words

The device as defined in claim 33 further comprising a rocking block fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and also fixed to the one end of said rocking arm, said rocking block being adapted to be rocked by flexing of said first and second leaf springs, wherein said first stopper member has a stopper surface separatably abutting against a longitudinal edge of said rocking arm at the other end portion thereof, and said second stopper member has a stopper surface separatably abutting against a side surface of said rocking block.

Claim 40

Dependent Claim 126 words

The device as defined in claim 34 further comprising a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; and a quadri-hinged parallel link mechanism fixed to said movable member and the other end of said sub frame, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element, wherein said first stopper member is fixed to the other end of said sub frame, and said second stopper member is fixed to said quadri-hinged parallel link mechanism in such a manner as to be supported on said movable member.

Claim 41

Independent Claim 128 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said main frame for magnifying the displacement of said piezoelectric element; and a separatable portion provided at least one of opposed surfaces between said movable member and said piezoelectric element and between said piezoelectric element and said lateral projection of said main frame.

Claim 42

Independent Claim 128 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a main frame extending along one side of said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said main frame for magnifying the displacement of said piezoelectric element; and a separatable portion provided at least one of opposed surfaces between said movable member and said piezoelectric element and between said piezoelectric element and said lateral projection of said main frame.

Claim 43

Dependent Claim 105 words

The device as defined in claim 36, wherein said means for magnifying the displacement of said piezoelectric element comprises a first leaf spring fixed at its one end portion to said main frame, a second leaf spring fixed at its one end portion to said movable member and disposed in opposed relationship to said first leaf spring, and a rocking member fixedly connected to the other end of said first leaf spring and the other end of said second leaf spring and adapted to be rocked by flexing of said first and second leaf springs to be generated by the displacement of said piezoelectric element.

Claim 44

Dependent Claim 86 words

The device as defined in claim 37 further comprising a sub frame extending along the other side of said piezoelectric element opposed to said main frame to a position opposed to said movable member and fixedly connected at its one end to said lateral projection of said main frame; and a quadri-hinged parallel link mechanism fixed to said movable member and the other end of said sub frame, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element.

Claim 45

Dependent Claim 30 words

The device as defined in claim 36,37 or 38 wherein said separatable portion comprises at least one separatable layers separatably stacked on each other and fixed to said opposed surfaces.

Claim 46

Dependent Claim 84 words

The device as defined in claim 39 further comprising a temperature compensating member having a characteristic of temperature-linear expansion contrary to that of said piezoelectric element and a preload member for applying a given compression load to said piezoelectric element in a rest position of said piezoelectric element, wherein said temperature compensating member and said preload member are interposed between said piezoelectric element and said lateral projection, and said at least one separatable layers are interposed between said movable member and said piezoelectric element.

Claim 47

Dependent Claim 85 words

The device as defined in claim 39 further comprising a temperature compensating member having a characteristic of temperature-linear expansion contrary to that of said piezoelectric element and a preload member for applying a given compression load to said piezoelectric element in a rest position of said piezoelectric element, wherein said temperature compensating member and said preload member are interposed between said piezoelectric element and said lateral projection, and said at least one separatable layers are interposed between said temperature compensating member and said preload member.

Claim 48

Dependent Claim 88 words

The device as defined in claim 39 further comprising a temperature compensating member having a characteristic of temperature-linear expansion contrary to that of said piezoelectric element and a preload member for applying a given compression load to said piezoelectric element in a rest position of said piezoelectric element, wherein said temperature compensating member and said at least one separatable layers are interposed between said movable member and said piezoelectric element, and said preload member is interposed between said piezoelectric element and said lateral projection of said main frame.

Claim 49

Dependent Claim 19 words

The device as defined in claim 39, wherein said at least one separatable layers are formed of zirconia ceramic.

Claim 50

Dependent Claim 19 words

The device as defined in claim 39, wherein said at least one separatable layers are formed of synthetic resin.

Claim 51

Independent Claim 160 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a frame member extending along said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said frame member for magnifying the displacement of said piezoelectric element; and a quadri-hinged parallel link mechanism fixed to said movable member and said frame member, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element; wherein said movable member is pressed on the other end of said piezoelectric element by an elastic force of said quadri-hinged parallel link mechanism to apply a given compression load to said piezoelectric element.

Claim 52

Independent Claim 160 words

A device for magnifying displacement of an elongated piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a frame member extending along said piezoelectric element and having a lateral projection for supporting one end of said piezoelectric element with respect to a direction of displacement of said piezoelectric element; a movable member mounted on the other end of said piezoelectric element with respect to the direction of displacement of said piezoelectric element; means connected to said movable member and said frame member for magnifying the displacement of said piezoelectric element; and a quadri-hinged parallel link mechanism fixed to said movable member and said frame member, so as to displace said movable member in parallel to the direction of displacement of said piezoelectric element; wherein said movable member is pressed on the other end of said piezoelectric element by an elastic force of said quadri-hinged parallel link mechanism to apply a given compression load to said piezoelectric element.

Claim 53

Dependent Claim 62 words

The device as defined in claim 45, wherein said frame member comprises a main frame extending along one side of said piezoelectric element and a sub frame extending along the other side of said piezoelectric element opposite to said main frame to a position opposed to said movable member; and said quadri-hinged parallel link mechanism is fixed also to said sub frame.

Claim 54

Dependent Claim 122 words

The device as defined in claim 46, wherein said quadri-hinged parallel link mechanism comprises a pair of link plates and a bridge portion for bridging said link plates; and said link plates comprise a pair of first parallel vertical portions to be fixed to opposite side surfaces of said sub frame, a pair of second parallel vertical portions to be fixed to opposite side surfaces of said movable member, a pair of first parallel horizontal portions and a pair of second parallel horizontal portions extending between said first parallel vertical portions and said second parallel vertical portions, and a pair of four elastically deformable hinge portions connecting said first and second parallel vertical portions with said first and second parallel vertical portions.

Claim 55

Dependent Claim 45 words

The device as defined in claim 47 further comprising a pair of connecting plates extending horizontally from said first parallel vertical portions, each of said connecting plates being fixed to a side surface of said sub frame and a side surface of said main frame.

Claim 56

Dependent Claim 59 words

The device as defined in claim 47, wherein said second parallel vertical portions are fixed to the opposite side surfaces of said movable member under the condition where said first parallel vertical portions are fixed to the opposite side surfaces of said sub frame, and said second parallel vertical portions are lifted against the elasticity of said hinge portions.

Claim 57

Dependent Claim 59 words

The device as defined in claim 47, wherein said first parallel vertical portions are fixed to the opposite side surfaces of said sub frame under the condition where said second parallel vertical portions are fixed to the opposite side surfaces of said movable member, and said first parallel vertical portions are lowered against the elasticity of said hinge portions.

Claim 58

Dependent Claim 196 words

An impact dot printing head of a type to be driven by a piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a plurality of printing units each having a printing wire for printing dots onto a printing medium and a displacement transmitting mechanism for transmitting displacement of said piezoelectric element to said printing wire; a holder for holding said printing units, said holder being formed with a plurality of slits each for releaseably inserting each of said printing units; a cover plate adapted to be engaged with said holder and having means for releaseably fixing each of said printing units, said cover plate being formed with a guide portion for guiding said printing wires of said printing units; and a flexible printed wiring board partially wound around an outer circumferential surface of said holder, said flexible printed wiring board having plural pairs of connection terminals which each pair is connected to a pair of lead wires connected to said piezoelectric element, each pair of said connection terminals being arranged in the vicinity of each said printing unit and being connected through conductors to end terminals to be connected to printing control means.

Claim 59

Dependent Claim 196 words

An impact dot printing head of a type to be driven by a piezoelectric element adapted to be displaced by application of voltage thereto, comprising: a plurality of printing units each having a printing wire for printing dots onto a printing medium and a displacement transmitting mechanism for transmitting displacement of said piezoelectric element to said printing wire; a holder for holding said printing units, said holder being formed with a plurality of slits each for releaseably inserting each of said printing units; a cover plate adapted to be engaged with said holder and having means for releaseably fixing each of said printing units, said cover plate being formed with a guide portion for guiding said printing wires of said printing units; and a flexible printed wiring board partially wound around an outer circumferential surface of said holder, said flexible printed wiring board having plural pairs of connection terminals which each pair is connected to a pair of lead wires connected to said piezoelectric element, each pair of said connection terminals being arranged in the vicinity of each said printing unit and being connected through conductors to end terminals to be connected to printing control means.

Device for magnifying displacement of piezoelectric element

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