EP0362356B1 - Printing apparatus - Google Patents
Printing apparatus Download PDFInfo
- Publication number
- EP0362356B1 EP0362356B1 EP89904482A EP89904482A EP0362356B1 EP 0362356 B1 EP0362356 B1 EP 0362356B1 EP 89904482 A EP89904482 A EP 89904482A EP 89904482 A EP89904482 A EP 89904482A EP 0362356 B1 EP0362356 B1 EP 0362356B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printed circuit
- carriage
- circuit member
- print head
- printing apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
Definitions
- the present invention relates to a printing apparatus and more particularly, but not exclusively, to a printing apparatus employing a dot matrix print head supported on a movable carriage which also supports circuit means for providing electrical power to the print head.
- the flexible cable is designed to have the source end stationary and to provide sufficient length of cable so that when the print head moves across the printer, a portion of the cable moves with the print head.
- U.S. Patent No. 4,518,269 discloses a printer employing a print head having a flexible cable pressed between the core frame and the nose member of the print head.
- a further disadvantage is that a sufficiently long length of flexible cable must be provided in order to couple the print head to the power source. In addition to the expense of the flexible cable care is required in guiding and securing the flexible cable to the carriage of the printer to provide a safe and suitable path for connection to the print head.
- Patent Abstracts of Japan Vol. 9 Number 164(M-395) (1887) 10 July 1985 discloses a printing apparatus having coupling means for ease of connection between the print head and the flexible cable.
- the apparatus is disadvantageous in that the flexible cable and coupling means cannot be quickly or simply connected to, or disconnected from, the print carriage.
- the assembly or disassembly operation is disadvantageously complicated and slow.
- the present invention provides a printing apparatus including a print head mounted on a carriage movable in a transverse direction, a first printed circuit member affixed to and extending from said print head, coupling means for receiving said first printed circuit member and connecting said first printed circuit member to flexible cable means for providing electrical power to said print head, characterized in that said coupling means comprises a second printed circuit member supported by said carriage and having receiving means secured thereto for receiving one end of said first printed circuit member thereby forming an operable coupling between said first and second printed circuit members, and in that said flexible cable means is affixed at one end thereof to said second printed circuit member, and further characterized in that said carriage includes a recess for receiving one end of said second printed circuit member and a pair of cantilever-type arms integrally formed on said carriage each with inwardly facing support means arranged for snap-action engagement with the other end of said second printed circuit board such that said second printed circuit member is supported from said carriage in an arrangement to be swingable from, and to, a supported position.
- the flexible cable is connected directly to a separate printed circuit member supported on the carriage rather than to a printed circuit member forming part of the print head, it is possible to employ a shorter length of flexible cable and to employ simple means for guiding the cable, thereby reducing cost. Also, since the printed circuit member forming part of the print head is not connected directly to the cable, it is possible to use a relatively thin and inexpensive printed circuit card as this member.
- a printer in accordance with one embodiment of the present invention may be of a multi-function type that can accommodate a receipt, a journal and a slip or form which form consists of one or more parts.
- the printer can be set in one of five different modes of operation which includes printing a journal only, printing a receipt only, printing a receipt and a journal, printing a slip or form only, or printing a slip or form and a journal.
- Fig. 1 shows a side elevational view of a print head carriage 20 supporting a print head 22.
- the print head 22 is shown in phantom lines to indicate that part of the print head assembly which is removable or easily replaced.
- the carriage 20 includes bearing means in the form of a pair of front bearings 24 and 26 (Fig. 2) that are supported by and move along a guide rail or supporting shaft 28.
- a rear bearing 30 provides a journal and support for a guide rail or supporting shaft 32 that is parallel to the shaft 28.
- the guide rail or supporting shaft 28 is supported in suitable manner from side frames of a printer 29 (Fig. 6).
- the shaft 32 is likewise supported from side frames of the printer.
- the print head carriage 20 is a molded part which may be made of Lexan material and is of unitary construction and of a complex shape to accommodate the many functions that the carriage is required to perform.
- the carriage includes a nose or front portion 34 of generally plate-like shape to support the nose portion 36 of the print head 22.
- the nose portion 34 of the carriage includes a pair of spaced hubs 38 and 40 for receiving and securing the print head 22.
- a projection 42 at the front of the nose portion 34 of the carriage 20 serves to guide the print head 22 when installing the print head and to maintain the nose portion 36 in position on the carriage.
- An upright plate portion 44 of the carriage 20 supports the nose portion 34 and connects a pair of bridging portions 46 and 48 that are integral with the front bearings 24 and 26.
- the bridging portions 46 and 48 are integral with and connect with a generally horizontal plate portion 50, the plate portion providing an opening 52 therein between the bridging portions 46 and 48 for receiving a lower portion of the print head 22.
- the carriage 20 also includes a pair of downwardly extending arms 54 and 56 (Fig. 3) which support a printed circuit board 58 (Fig. 5) that provides electrical power to the print head 22.
- the carriage 20 has a recess 60 formed therein at a location just rearward of the bearing portion 26 for receiving an end portion 62 (Fig. 5) of the printed circuit board 58.
- the other end 64 has recesses or cutouts 66 and 68 for engagement by tip portions or snaps 70 and 71 which support the end 64 of the board 58.
- the printed circuit board 58 includes a receptacle or like device 72 secured to the top of the board for receiving a printed circuit card 76 of the print head 22.
- the receptacle 72 is permanently affixed to the end 62 of the board 58.
- the printed circuit card 76 is sandwiched between the nose portion 36 and the coil portion 78 of the print head 22.
- the carriage 20 has a plurality of lugs or guides 80 integral with the plate portion 50 and spaced thereacross for the purpose of routing a flat, flexible cable 82 (Figs. 1, 2 and 4).
- the cable 82 is also permanently affixed to the printed circuit board 58, as seen in Fig. 4, and is trained through a passageway formed by a clamp or like element 84 and a guide or like element 86, both integrally formed or molded as a part of the carriage 20.
- the cable 82 is trained in a suitable path from the top of the plate portion 50 to a source 85 or like connection.
- Fig. 5 shows the printed circuit board 58 with the layout and routing of the conductors or runs 88 which are embedded in the substrate of the board.
- the conductors 88 are sufficient in number and arranged to accommodate a nine wire dot matrix print head and include a pair of common conductors.
- the illustrated runs 88 terminating at the right side of the portion 62 of the board 58 are provided for accommodating a nine wire print head.
- the printed circuit board 58 is placed into the recess 60 of the carriage while the end 64 is held in a lowered position (Fig. 1).
- the board 58 is then raised up and the edges of the board, at cutouts 66 and 68 thereof (Fig. 5), engage the angled surfaces of the tip portions or snaps 70 and 71.
- the cantilever-type arms 54 and 56 are sprung outwardly to receive the printed circuit board 58 and then are sprung back with a snap action to contain the board in a secure manner.
- the receptacle 72 is thereby positioned to receive the printed circuit card 76 when the print head 22 is lowered into place between the hubs 38 and 40 and onto the plate portion 34 of the carriage 20 for securing the print head.
Abstract
Description
- The present invention relates to a printing apparatus and more particularly, but not exclusively, to a printing apparatus employing a dot matrix print head supported on a movable carriage which also supports circuit means for providing electrical power to the print head.
- It is known in the field of dot matrix printers to provide a print head carriage which is mounted for reciprocal movement along a horizontal direction. It is also known to provide a flat, flexible cable containing a plurality of leads or conductors for distributing power from an electrical source to a number of solenoid-type, print wire drive elements or actuators. The flexible cable is designed to have the source end stationary and to provide sufficient length of cable so that when the print head moves across the printer, a portion of the cable moves with the print head.
- U.S. Patent No. 4,518,269 discloses a printer employing a print head having a flexible cable pressed between the core frame and the nose member of the print head.
- One of the disadvantages of the above printer design is that considerable installation time may be required when replacing the print head. This arises because of the need to disconnect the flexible cable from the old print head and subsequently reconnect the flexible cable to the new print head. Furthermore care is required in the disconnection and reconnection process to avoid damage to connections on the print head.
- A further disadvantage is that a sufficiently long length of flexible cable must be provided in order to couple the print head to the power source. In addition to the expense of the flexible cable care is required in guiding and securing the flexible cable to the carriage of the printer to provide a safe and suitable path for connection to the print head.
- Patent Abstracts of Japan Vol. 9 Number 164(M-395) (1887) 10 July 1985, discloses a printing apparatus having coupling means for ease of connection between the print head and the flexible cable. However, the apparatus is disadvantageous in that the flexible cable and coupling means cannot be quickly or simply connected to, or disconnected from, the print carriage. Thus, the assembly or disassembly operation is disadvantageously complicated and slow.
- It is an object of the present invention to provide a design of printing apparatus which alleviates the above disadvantages and facilitates the installation or replacing of the print head.
- Accordingly, the present invention provides a printing apparatus including a print head mounted on a carriage movable in a transverse direction, a first printed circuit member affixed to and extending from said print head, coupling means for receiving said first printed circuit member and connecting said first printed circuit member to flexible cable means for providing electrical power to said print head, characterized in that said coupling means comprises a second printed circuit member supported by said carriage and having receiving means secured thereto for receiving one end of said first printed circuit member thereby forming an operable coupling between said first and second printed circuit members, and in that said flexible cable means is affixed at one end thereof to said second printed circuit member, and further characterized in that said carriage includes a recess for receiving one end of said second printed circuit member and a pair of cantilever-type arms integrally formed on said carriage each with inwardly facing support means arranged for snap-action engagement with the other end of said second printed circuit board such that said second printed circuit member is supported from said carriage in an arrangement to be swingable from, and to, a supported position.
- It will be appreciated that since, in a printing apparatus in accordance with the invention, the flexible cable is connected directly to a separate printed circuit member supported on the carriage rather than to a printed circuit member forming part of the print head, it is possible to employ a shorter length of flexible cable and to employ simple means for guiding the cable, thereby reducing cost. Also, since the printed circuit member forming part of the print head is not connected directly to the cable, it is possible to use a relatively thin and inexpensive printed circuit card as this member.
- An embodiment of the present invention will now be described by way of example, with reference to the accompanying drawings, in which:
- Fig. 1 is a side elevational view of the print head and carriage assembly in accordance with one embodiment of the present invention;
- Fig. 2 is an enlarged top plan view of the print head carriage with the print head thereon;
- Fig. 3 is an elevational view taken on the line 3-3 of Fig. 1;
- Fig. 4 is a sectional view taken on the line 4-4 of Fig. 2;
- Fig. 5 is a view illustrating the printed circuit board with the conductor runs embedded therein; and
- Fig. 6 is a perspective view of a printer.
- Prior to describing the structure in detail it should be noted that a printer in accordance with one embodiment of the present invention may be of a multi-function type that can accommodate a receipt, a journal and a slip or form which form consists of one or more parts. The printer can be set in one of five different modes of operation which includes printing a journal only, printing a receipt only, printing a receipt and a journal, printing a slip or form only, or printing a slip or form and a journal.
- Referring now to the drawing, Fig. 1 shows a side elevational view of a
print head carriage 20 supporting aprint head 22. Theprint head 22 is shown in phantom lines to indicate that part of the print head assembly which is removable or easily replaced. Thecarriage 20 includes bearing means in the form of a pair offront bearings 24 and 26 (Fig. 2) that are supported by and move along a guide rail or supportingshaft 28. Arear bearing 30 provides a journal and support for a guide rail or supportingshaft 32 that is parallel to theshaft 28. The guide rail or supportingshaft 28 is supported in suitable manner from side frames of a printer 29 (Fig. 6). Theshaft 32 is likewise supported from side frames of the printer. - The
print head carriage 20 is a molded part which may be made of Lexan material and is of unitary construction and of a complex shape to accommodate the many functions that the carriage is required to perform. The carriage includes a nose orfront portion 34 of generally plate-like shape to support thenose portion 36 of theprint head 22. Thenose portion 34 of the carriage includes a pair of spacedhubs print head 22. Aprojection 42 at the front of thenose portion 34 of thecarriage 20 serves to guide theprint head 22 when installing the print head and to maintain thenose portion 36 in position on the carriage. Anupright plate portion 44 of thecarriage 20 supports thenose portion 34 and connects a pair ofbridging portions front bearings bridging portions horizontal plate portion 50, the plate portion providing anopening 52 therein between thebridging portions print head 22. - The
carriage 20 also includes a pair of downwardly extendingarms 54 and 56 (Fig. 3) which support a printed circuit board 58 (Fig. 5) that provides electrical power to theprint head 22. Thecarriage 20 has arecess 60 formed therein at a location just rearward of thebearing portion 26 for receiving an end portion 62 (Fig. 5) of the printedcircuit board 58. Theother end 64 has recesses orcutouts 66 and 68 for engagement by tip portions orsnaps end 64 of theboard 58. - The printed
circuit board 58 includes a receptacle or likedevice 72 secured to the top of the board for receiving a printedcircuit card 76 of theprint head 22. Thereceptacle 72 is permanently affixed to theend 62 of theboard 58. The printedcircuit card 76 is sandwiched between thenose portion 36 and thecoil portion 78 of theprint head 22. - The
carriage 20 has a plurality of lugs orguides 80 integral with theplate portion 50 and spaced thereacross for the purpose of routing a flat, flexible cable 82 (Figs. 1, 2 and 4). Thecable 82 is also permanently affixed to the printedcircuit board 58, as seen in Fig. 4, and is trained through a passageway formed by a clamp or likeelement 84 and a guide or likeelement 86, both integrally formed or molded as a part of thecarriage 20. Thecable 82 is trained in a suitable path from the top of theplate portion 50 to asource 85 or like connection. - Fig. 5 shows the
printed circuit board 58 with the layout and routing of the conductors or runs 88 which are embedded in the substrate of the board. Theconductors 88 are sufficient in number and arranged to accommodate a nine wire dot matrix print head and include a pair of common conductors. The illustratedruns 88 terminating at the right side of theportion 62 of theboard 58 are provided for accommodating a nine wire print head. - In the practice of the embodiment, and assuming that the
print head 22 is being assembled to thecarriage 20, or that aprint head 22 is being replaced, the printedcircuit board 58 is placed into therecess 60 of the carriage while theend 64 is held in a lowered position (Fig. 1). Theboard 58 is then raised up and the edges of the board, atcutouts 66 and 68 thereof (Fig. 5), engage the angled surfaces of the tip portions orsnaps type arms circuit board 58 and then are sprung back with a snap action to contain the board in a secure manner. - The
receptacle 72 is thereby positioned to receive the printedcircuit card 76 when theprint head 22 is lowered into place between thehubs plate portion 34 of thecarriage 20 for securing the print head. - It is thus seen that herein shown and described is a carriage on which is installed a dot matrix print head that has a self-contained printed circuit card for simple and convenient assembly. The printed circuit card is received in a receptacle that is affixed to a printed circuit board. A flat, flexible cable is affixed to the printed circuit board.
Claims (8)
- A printing apparatus including a print head (22) mounted on a carriage (20) movable in a transverse direction, a first printed circuit member (76) affixed to and extending from said print head (22), coupling means for receiving said first printed circuit member (76) and connecting said first printed circuit member (76) to flexible cable means (82) for providing electrical power to said print head (22), characterized in that said coupling means comprises a second printed circuit member (58) supported by said carriage (20) and having receiving means (72) secured thereto for receiving one end of said first printed circuit member (76) thereby forming an operable coupling between said first and second printed circuit members (76, 58), and in that said flexible cable means (82) is affixed at one end thereof to said second printed circuit member (58), and further characterized in that said carriage (20) includes a recess (60) for receiving one end of said second printed circuit member (58) and a pair of cantilever-type arms (54, 56) integrally formed on said carriage (20) each with inwardly facing support means (70, 71) arranged for snap-action engagement with the other end of said second printed circuit board (58) such that said second printed circuit member (58) is supported from said carriage (20) in an arrangement to be swingable from, and to, a supported position.
- A printing apparatus as claimed in claim 1, characterized in that said first printed circuit member (76) is a printed circuit card (76) which is thinner than said second printed circuit member (58) which is a printed circuit board (58).
- A printing apparatus as claimed in claim 1 or 2, characterized in that said carriage (20) includes a plurality of guides (80) integrally formed therewith for guiding said flexible cable means (82) along a path from said second printed circuit member (58) to an electrical supply.
- A printing apparatus as claimed in any one of claims 1 to 3, characterized in that said carriage (20) includes a pair of spaced hubs (38, 40) integral therewith for maintaining said print head (22) in position for enabling insertion of said first printed circuit member (76) into said receiving means (72).
- A printing apparatus as claimed in any one of claims 1 to 4, characterized in that said carriage (20) includes a pair of bearing members (24, 26) at one end thereof and a U-shaped bearing member (30) at the other end thereof, each of said bearing members (24, 26, 30) being an integral part of said carriage (20).
- A printing apparatus as claimed in any one of claims 1 to 5, characterized in that said carriage (20) includes a plate member (50) integral with said guides (80) and a clamp member (84) integral with said plate member (50) for maintaining said flexible cable means (82) in position from said second printed circuit member (58) to said guides (80).
- A printing apparatus as claimed in any one of claims 1 to 6, characterized in that said receiving means (72) comprises an enclosure having electrical connectors for connection to said first printed circuit member (76).
- A printing apparatus as claimed in any one of claims 1 to 7 characterized in that said carriage (20) is of unitary construction and is supported by and movable along a pair of spaced guide rails (28, 32).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17695788A | 1988-04-04 | 1988-04-04 | |
US176957 | 1988-04-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0362356A1 EP0362356A1 (en) | 1990-04-11 |
EP0362356B1 true EP0362356B1 (en) | 1993-05-19 |
Family
ID=22646595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89904482A Expired - Lifetime EP0362356B1 (en) | 1988-04-04 | 1989-03-21 | Printing apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0362356B1 (en) |
JP (1) | JP2772565B2 (en) |
DE (1) | DE68906629T2 (en) |
WO (1) | WO1989009694A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1129478B (en) * | 1980-12-23 | 1986-06-04 | Olivetti & Co Spa | SERIAL POINT THERMAL PRINTER |
FR2548593B1 (en) * | 1983-07-08 | 1985-12-06 | Sagem | WRITING DEVICE WITH HEATING ELEMENTS FOR THERMAL EFFECT PRINTING ON A WRITING MEDIUM |
-
1989
- 1989-03-21 WO PCT/US1989/001113 patent/WO1989009694A1/en active IP Right Grant
- 1989-03-21 EP EP89904482A patent/EP0362356B1/en not_active Expired - Lifetime
- 1989-03-21 DE DE89904482T patent/DE68906629T2/en not_active Expired - Fee Related
- 1989-03-21 JP JP1504304A patent/JP2772565B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2772565B2 (en) | 1998-07-02 |
DE68906629D1 (en) | 1993-06-24 |
JPH02503777A (en) | 1990-11-08 |
WO1989009694A1 (en) | 1989-10-19 |
EP0362356A1 (en) | 1990-04-11 |
DE68906629T2 (en) | 1994-01-05 |
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