CA1259521A - Mechanism for stabilizing platen - Google Patents
Mechanism for stabilizing platenInfo
- Publication number
- CA1259521A CA1259521A CA000516788A CA516788A CA1259521A CA 1259521 A CA1259521 A CA 1259521A CA 000516788 A CA000516788 A CA 000516788A CA 516788 A CA516788 A CA 516788A CA 1259521 A CA1259521 A CA 1259521A
- Authority
- CA
- Canada
- Prior art keywords
- platen
- members
- guide
- printer
- pair
- 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
Links
Abstract
MECHANISM FOR STABILIZING PLATEN
Abstract of the Disclosure A platen stabilizing mechanism includes a guide bracket secured to the printer, and an adjustable platen carrier that defines a slanting surface against which a locking ball is urged by a spring to thereby secure the platen in position. An adjusting screw sets the precise position of the platen and its carrier.
Abstract of the Disclosure A platen stabilizing mechanism includes a guide bracket secured to the printer, and an adjustable platen carrier that defines a slanting surface against which a locking ball is urged by a spring to thereby secure the platen in position. An adjusting screw sets the precise position of the platen and its carrier.
Description
i;259~
MECHANISM FOR ST BILIZING PLATEN
Background of the Invention In the field of printing, the most common type of printer has been the printer which impacts against record media that is caused to be moved past a line of printing. As is well-known, the impact printing operation depends upon the movement of impact members, such as print hammers or wires or the like, which are typically moved by means of an electromechanical-type system and which system enables precise control of the impact members.
In the field of dot matrix printers, it has been quite common to provide a print head which has included therein a plurality of print wire actuators or solenoids arranged or grouped in a manner to drive the respective print wires a very short, precise distance from a rest or non-printing position to an impact or printing position. The print wires are generally either secured to or engaged by the solenoid plunger or armature which is caused to be moved such precise distance when the solenoid coil is energized and wherein the plunger or armature normally operates against the action of a return spring.
It has also been quite common to provide an arrangement or grouping of such solenoids in a circular configuration to take advantage of reduced space available in the manner of locating the print wires in that specific area between the solenoids and the front tip of the print head adjacent the record media. In this respect, the actuating ends of the print wires are positioned in accordance with the circular arrangement and the operating or working ends of the print wires are closely spaced in vertically-aligned manner adjacent the record media. The availability of narrow or compact actuators permits a narrower or smaller print head to be used and thereby ~s~s~
red~ces the width of the printer because of the reduced clearance at the ends of the print line. The print head can also be made shorter because the narrow actuators can be placed in side-by-side manner closer to the record media for a given amount of wire curvature.
In the wire matrix printer which is utilized for receipt and journal printing operation, the print head structure may be a multiple element type and horizontally disposed with the wire elements aligned in a vertical line and supported on a print head carriage which is caused to be moved or driven in a horizontal direction for printing in line manner across the receipt or journal paper and wherein the drive elements or transducers may be positioned in a circular configuration with the respective wires leading to the front tip of the print head. In the wire matrix printer which is utilized for business forms or like record media printing operation, the print head may be oriented in a manner wherein the nose is pointed downward for printing on the form or record media while the carriage and print head are moved above and across the form or media in the horizontal direction.
Further, the printer structure may be an arrangement which includes a plurality of equally-spaced, horizontally-aligned, single element print heads which are caused to be moved in back and forth manner to print successive lines of dots in making up the lines of characters. In this latter arrangement, the drive elements or transducers are individually supported along a line of printing. These single wire actuators or solenoids are generally tubular or cylindrically shaped and include a shell which encloses a coil, an armature and a resilient member arranged in manner and form wherein the actuator is operable to cause the print wire to be axially moved a small precise distance in dot matrix printing.
lZ5~
In the case of a wire matrix printer which is utilized for form or multi-copy printing, the difference in thickness of the forms or copies may require some means or mechanism for adjusting the gap or the distance between the print head and the printer platen. In view of the impact nature of such wire matrix printer relative to form or multi-copy printing, the platen should preferably be adjustably stabilized under certain printing conditions. It is with the field of printing receipt, journal, and business forms or like record media of different thicknesses that the subject matter of the present invention is most closely associated, and provides for improved and advantageous positioning of such record media during the printing operation. In prior designs the platen generally has been contained or stabilized by means of a compression spring backing up each end of the platen, which spring can allow the platen gap to change durincl the printing operation.
Representative documentation in the field of wire matrix print heads used for printing forms or like record media includes United States Patent No.
3,776,341, issued to R. G. Dobner et al. on December 4, 1973, which discloses a document support system that includes front and rear paper guides which cooperate to maintain the document in a fixed location. The rear guide is spring biased towards the front guide.
United States Patent No. 3,987,886, issued to F. A. Mahoney et al. on October 26, 1976, discloses mechanism for varying the print gap, including eccentric means formed and disposed to move housing means toward and away from the type font of a printer.
United States Patent No. 4,063,630, issued to W. R. Crowe et al. on December 20, 1977, discloses platen carrier means for maintaining the platen in a constant vertical position at least during relative 1:25~1~i21 _ 4 vertical adjustment of the print element with respect to the platen.
United States Patent No. 4,189,244, issued to G. ~. Harrison on February 19, 1980, discloses a platen gap adjuster including an eccentric shaft mounted by means of offset spindles.
Summary of the Invention The present invention relates generally to impact type printers which have the capability of printing on record media of receipt or journal type, or forms of different thicknesses. More particularly, the present invention relates to means for positioning and stabilizing the printer platen in a manner to compensate for the difference in thicknesses of the several types of record media being used in the printer. The record media may be a single layer sheet or a variety of multilayer forms, any of which may be of different or greater thickness than other media.
In accordance with the present invention, there is provided a stabilizing mechanism for a platen in a printer having a frame and an impact type print element, said mechanism comprising guide means comprising a palr of generally rectangular members secured to the frame of the printer and having elongated apertures in a plate portion of each of said generally rectangular members, platen carrying means supported by the guide means and including members projecting through said apertures and adjustably coupled to said guide means, said platen carrying means including a wall member positioned at an angle relative to and having a surface opposed to a surface of the platen, said surfaces defining a space narrowing in one direction, a substantially spherical member positioned between and engaging the surface of the wall member and the surface of the platen, and resilient means urging the spherical member in the h 12~
- 4a -direction oE the narrowing space between the surfaces for holding the platen in position upon impact by said print element.
A platen stabilizing mechanism or assembly is provided in the printer and such stabilizing mechanism includes a guide bracket which is secured to the printer at the sides thereof. An adjustable platen carrier is operably associated with the guide bracket and such platen carrier defines a slanting surface portion against which a locking ball is urged by a spring to secure and stabilize the platen in position.
An adjusting screw is utilized to set the precise position of the platen.
In view of the above discussion, the principal object of the present invention is to provide mechanism in a printer for setting the print gap to accommodate different thicknesses of record media.
Another object of the present invention is to provide camming means in a manner to set the platen gap at a predetermined space.
J~
iZ595~
An additional object of the present invention is to provide mechanism for adjustin~ and for setting or stabili~ing the platen gap for record media inserted between the platen and the print head.
A further object of the present invention is to provide camming means including a locking ball operable against a slanting surface to accommodate record media of different thicknesses at a printing station and means for holding the platen in precise position during printing operation.
Additional advantages and features of the present invention will become apparent and fully understood from a reading of the following description taken together with the annexed drawing.
Brief Description of the Drawing Fig. 1 is a side elevational view, partly in sectionr incorporating the subject matter of the present invention;
Fig. 2 is a top view of certain of the structure shown in Fig. l; and Fig. 3 is a view taken on the line 3-3 of Fig. 1.
Description of the Preferred Embodiment Referring now to the drawing, Fig. 1 illustrates a side elevational view of the apparatus of the present invention wherein 20 represents a platen for use in a journal, a receipt, or a slip type printer. A print head 22 is supported from the printer in well-known manner for impact printing against paper or like record media 24 which media is caused to be driven in a path between the print head and the platen 20. For purposes of illustrating the subject matter of the present invention, Fig. 2 is a top or plan view of certain of the apparatus of Fig. 1 and Fig. 3 is a view taken along the line 3-3 or Fig. 1.
~2595~1 It should be noted that Figs. 2 and 3 `
illustrate the apparatus at one side of the printer and that similar but oppositely oriented apparatus is provided at the other side, the platen 20 extending across the printer and the print head 22 traversing along the platen in forth and back motion in printing operation.
A ~uide bracket 26 of rectangular shape is secured by screws 28 (Fig. 2) to the printer frame 30.
The bracket 26 includes spaced sides 32 and 34 and ends 36 and 38 (Fig. 1) formed to provide a box-like structure. A pair of top plate portions 40 and 42 define elongated openings 44 and 46 therein for receiving projections 48 and 50 of a platen carrier 52. An upstanding portion 54 extending above end portion 36 has a tapped opening 56 therein for receiving an adjusting screw 58. A pair of gusset plates 60 and 62 (Fig. 2) provide support for the upstanding portion 54.
The platen carrier 52 includes a base plate 64 (Figs. 1 and 3~ with the projections 48 and 50 integral therewith. The base plate 64 seats on the top plate portions 40 and 42 of the guide bracket 26.
The carrier 52 has upstanding walls or end portions 66 and 68, the portion 66 being spaced from and facing the upstanding portion 54 of the guide bracket, and the portion 68 facing and engaging with the platen 20 in a seating arrangement thereof. The platen carrier 52 also includes an upstanding portion in the form of a slanted wall 69 (Fig. 1) positioned between the end portions 66 and 68. When the platen carrier 52 is placed on the guide bracket 26, the projections 48 and 50 are positioned for slidable movement in the elongated openings 44 and 46 in response to ad]usting action of the screw 58 in the threaded opening 56.
The screw 58 has a reduced diameter end portion 65 extending through the upstanding end portion 66 of the lZ595~1 -- 7 ~
platen carrier 52. The end portion 65 provides an abutment 67 bearing against one side of the end portion 66 for moving the platen carrier 52 in a direction toward and away from the print head 22.
The platen carrier 52 also includes a well 70 positioned between the projections 48 and 50 and extending downwardly from the base plate 64. The well 70 is formed with a side wall 72 and a bottom portion 74 having an aperture 76 therein.
A locking ball member 80 is positioned between a surface 82 of the slanted wall 69 (Fig. 1) of the platen carrier 52, which slanted wall extends upwardly and adjacent the well 7Q, and a surface 81 of the platen 20. The locking ball 80 has a rod or tenon portion 84 as an integral part thereof extending into the well 70 and through the aperture 76. The well 70 is of sufficient diameter to receive a coil spring 86 encircling the rod portion 84 and engaging the well bottom portion 74 on the top side thereof and the ball 80 on the bottom side thereof for exerting continuing pressure on the ball and urging the ball in an upward direction.
In the operation of the apparatus of the present inventian, the front surface of the platen 20 is seated against the upstanding portion 68 of the platen carrier 52 and the ball 80 is wedged between the rear surface of the platen and the front surface of the slanted portion 82. The print gap between the platen 20 and the print head 22 is adjusted by turning the screw 58 in the threaded opening 56, the abutment 67 of such screw bearing against the side surface of the upstanding end portion 66 for moving the platen 20 and the platen carrier 52, with such gap being provided in predetermined manner and position by the several parts of the invention. The spring 86 continually urges the ball 80 upwardly into the narrowing or reducing space between surface 81 of the l'~S95~
platen 20 and the surface 82 of the inclined wall 69.
When it is desired to remove or change the position of the platen 20, the ball 80 is manually depressed against the action of the coil spring 86 and may seat into a curved portion 88 formed in the side wall 72 of the well 70.
It is thus seen that herein shown and described is apparatus for setting and for stabilizing the platen in an impact type printer. The mechanism and arrangement enables the accomplishment of the objects and advantages mentioned above, and while a preferred embodiment of the invention has been disclosed herein, variations thereof may occur to those skilled in the art. It is contemplated that all such variations not departing from the spirit and scope of the invention hereof are to be construed in accordance with the following claims.
MECHANISM FOR ST BILIZING PLATEN
Background of the Invention In the field of printing, the most common type of printer has been the printer which impacts against record media that is caused to be moved past a line of printing. As is well-known, the impact printing operation depends upon the movement of impact members, such as print hammers or wires or the like, which are typically moved by means of an electromechanical-type system and which system enables precise control of the impact members.
In the field of dot matrix printers, it has been quite common to provide a print head which has included therein a plurality of print wire actuators or solenoids arranged or grouped in a manner to drive the respective print wires a very short, precise distance from a rest or non-printing position to an impact or printing position. The print wires are generally either secured to or engaged by the solenoid plunger or armature which is caused to be moved such precise distance when the solenoid coil is energized and wherein the plunger or armature normally operates against the action of a return spring.
It has also been quite common to provide an arrangement or grouping of such solenoids in a circular configuration to take advantage of reduced space available in the manner of locating the print wires in that specific area between the solenoids and the front tip of the print head adjacent the record media. In this respect, the actuating ends of the print wires are positioned in accordance with the circular arrangement and the operating or working ends of the print wires are closely spaced in vertically-aligned manner adjacent the record media. The availability of narrow or compact actuators permits a narrower or smaller print head to be used and thereby ~s~s~
red~ces the width of the printer because of the reduced clearance at the ends of the print line. The print head can also be made shorter because the narrow actuators can be placed in side-by-side manner closer to the record media for a given amount of wire curvature.
In the wire matrix printer which is utilized for receipt and journal printing operation, the print head structure may be a multiple element type and horizontally disposed with the wire elements aligned in a vertical line and supported on a print head carriage which is caused to be moved or driven in a horizontal direction for printing in line manner across the receipt or journal paper and wherein the drive elements or transducers may be positioned in a circular configuration with the respective wires leading to the front tip of the print head. In the wire matrix printer which is utilized for business forms or like record media printing operation, the print head may be oriented in a manner wherein the nose is pointed downward for printing on the form or record media while the carriage and print head are moved above and across the form or media in the horizontal direction.
Further, the printer structure may be an arrangement which includes a plurality of equally-spaced, horizontally-aligned, single element print heads which are caused to be moved in back and forth manner to print successive lines of dots in making up the lines of characters. In this latter arrangement, the drive elements or transducers are individually supported along a line of printing. These single wire actuators or solenoids are generally tubular or cylindrically shaped and include a shell which encloses a coil, an armature and a resilient member arranged in manner and form wherein the actuator is operable to cause the print wire to be axially moved a small precise distance in dot matrix printing.
lZ5~
In the case of a wire matrix printer which is utilized for form or multi-copy printing, the difference in thickness of the forms or copies may require some means or mechanism for adjusting the gap or the distance between the print head and the printer platen. In view of the impact nature of such wire matrix printer relative to form or multi-copy printing, the platen should preferably be adjustably stabilized under certain printing conditions. It is with the field of printing receipt, journal, and business forms or like record media of different thicknesses that the subject matter of the present invention is most closely associated, and provides for improved and advantageous positioning of such record media during the printing operation. In prior designs the platen generally has been contained or stabilized by means of a compression spring backing up each end of the platen, which spring can allow the platen gap to change durincl the printing operation.
Representative documentation in the field of wire matrix print heads used for printing forms or like record media includes United States Patent No.
3,776,341, issued to R. G. Dobner et al. on December 4, 1973, which discloses a document support system that includes front and rear paper guides which cooperate to maintain the document in a fixed location. The rear guide is spring biased towards the front guide.
United States Patent No. 3,987,886, issued to F. A. Mahoney et al. on October 26, 1976, discloses mechanism for varying the print gap, including eccentric means formed and disposed to move housing means toward and away from the type font of a printer.
United States Patent No. 4,063,630, issued to W. R. Crowe et al. on December 20, 1977, discloses platen carrier means for maintaining the platen in a constant vertical position at least during relative 1:25~1~i21 _ 4 vertical adjustment of the print element with respect to the platen.
United States Patent No. 4,189,244, issued to G. ~. Harrison on February 19, 1980, discloses a platen gap adjuster including an eccentric shaft mounted by means of offset spindles.
Summary of the Invention The present invention relates generally to impact type printers which have the capability of printing on record media of receipt or journal type, or forms of different thicknesses. More particularly, the present invention relates to means for positioning and stabilizing the printer platen in a manner to compensate for the difference in thicknesses of the several types of record media being used in the printer. The record media may be a single layer sheet or a variety of multilayer forms, any of which may be of different or greater thickness than other media.
In accordance with the present invention, there is provided a stabilizing mechanism for a platen in a printer having a frame and an impact type print element, said mechanism comprising guide means comprising a palr of generally rectangular members secured to the frame of the printer and having elongated apertures in a plate portion of each of said generally rectangular members, platen carrying means supported by the guide means and including members projecting through said apertures and adjustably coupled to said guide means, said platen carrying means including a wall member positioned at an angle relative to and having a surface opposed to a surface of the platen, said surfaces defining a space narrowing in one direction, a substantially spherical member positioned between and engaging the surface of the wall member and the surface of the platen, and resilient means urging the spherical member in the h 12~
- 4a -direction oE the narrowing space between the surfaces for holding the platen in position upon impact by said print element.
A platen stabilizing mechanism or assembly is provided in the printer and such stabilizing mechanism includes a guide bracket which is secured to the printer at the sides thereof. An adjustable platen carrier is operably associated with the guide bracket and such platen carrier defines a slanting surface portion against which a locking ball is urged by a spring to secure and stabilize the platen in position.
An adjusting screw is utilized to set the precise position of the platen.
In view of the above discussion, the principal object of the present invention is to provide mechanism in a printer for setting the print gap to accommodate different thicknesses of record media.
Another object of the present invention is to provide camming means in a manner to set the platen gap at a predetermined space.
J~
iZ595~
An additional object of the present invention is to provide mechanism for adjustin~ and for setting or stabili~ing the platen gap for record media inserted between the platen and the print head.
A further object of the present invention is to provide camming means including a locking ball operable against a slanting surface to accommodate record media of different thicknesses at a printing station and means for holding the platen in precise position during printing operation.
Additional advantages and features of the present invention will become apparent and fully understood from a reading of the following description taken together with the annexed drawing.
Brief Description of the Drawing Fig. 1 is a side elevational view, partly in sectionr incorporating the subject matter of the present invention;
Fig. 2 is a top view of certain of the structure shown in Fig. l; and Fig. 3 is a view taken on the line 3-3 of Fig. 1.
Description of the Preferred Embodiment Referring now to the drawing, Fig. 1 illustrates a side elevational view of the apparatus of the present invention wherein 20 represents a platen for use in a journal, a receipt, or a slip type printer. A print head 22 is supported from the printer in well-known manner for impact printing against paper or like record media 24 which media is caused to be driven in a path between the print head and the platen 20. For purposes of illustrating the subject matter of the present invention, Fig. 2 is a top or plan view of certain of the apparatus of Fig. 1 and Fig. 3 is a view taken along the line 3-3 or Fig. 1.
~2595~1 It should be noted that Figs. 2 and 3 `
illustrate the apparatus at one side of the printer and that similar but oppositely oriented apparatus is provided at the other side, the platen 20 extending across the printer and the print head 22 traversing along the platen in forth and back motion in printing operation.
A ~uide bracket 26 of rectangular shape is secured by screws 28 (Fig. 2) to the printer frame 30.
The bracket 26 includes spaced sides 32 and 34 and ends 36 and 38 (Fig. 1) formed to provide a box-like structure. A pair of top plate portions 40 and 42 define elongated openings 44 and 46 therein for receiving projections 48 and 50 of a platen carrier 52. An upstanding portion 54 extending above end portion 36 has a tapped opening 56 therein for receiving an adjusting screw 58. A pair of gusset plates 60 and 62 (Fig. 2) provide support for the upstanding portion 54.
The platen carrier 52 includes a base plate 64 (Figs. 1 and 3~ with the projections 48 and 50 integral therewith. The base plate 64 seats on the top plate portions 40 and 42 of the guide bracket 26.
The carrier 52 has upstanding walls or end portions 66 and 68, the portion 66 being spaced from and facing the upstanding portion 54 of the guide bracket, and the portion 68 facing and engaging with the platen 20 in a seating arrangement thereof. The platen carrier 52 also includes an upstanding portion in the form of a slanted wall 69 (Fig. 1) positioned between the end portions 66 and 68. When the platen carrier 52 is placed on the guide bracket 26, the projections 48 and 50 are positioned for slidable movement in the elongated openings 44 and 46 in response to ad]usting action of the screw 58 in the threaded opening 56.
The screw 58 has a reduced diameter end portion 65 extending through the upstanding end portion 66 of the lZ595~1 -- 7 ~
platen carrier 52. The end portion 65 provides an abutment 67 bearing against one side of the end portion 66 for moving the platen carrier 52 in a direction toward and away from the print head 22.
The platen carrier 52 also includes a well 70 positioned between the projections 48 and 50 and extending downwardly from the base plate 64. The well 70 is formed with a side wall 72 and a bottom portion 74 having an aperture 76 therein.
A locking ball member 80 is positioned between a surface 82 of the slanted wall 69 (Fig. 1) of the platen carrier 52, which slanted wall extends upwardly and adjacent the well 7Q, and a surface 81 of the platen 20. The locking ball 80 has a rod or tenon portion 84 as an integral part thereof extending into the well 70 and through the aperture 76. The well 70 is of sufficient diameter to receive a coil spring 86 encircling the rod portion 84 and engaging the well bottom portion 74 on the top side thereof and the ball 80 on the bottom side thereof for exerting continuing pressure on the ball and urging the ball in an upward direction.
In the operation of the apparatus of the present inventian, the front surface of the platen 20 is seated against the upstanding portion 68 of the platen carrier 52 and the ball 80 is wedged between the rear surface of the platen and the front surface of the slanted portion 82. The print gap between the platen 20 and the print head 22 is adjusted by turning the screw 58 in the threaded opening 56, the abutment 67 of such screw bearing against the side surface of the upstanding end portion 66 for moving the platen 20 and the platen carrier 52, with such gap being provided in predetermined manner and position by the several parts of the invention. The spring 86 continually urges the ball 80 upwardly into the narrowing or reducing space between surface 81 of the l'~S95~
platen 20 and the surface 82 of the inclined wall 69.
When it is desired to remove or change the position of the platen 20, the ball 80 is manually depressed against the action of the coil spring 86 and may seat into a curved portion 88 formed in the side wall 72 of the well 70.
It is thus seen that herein shown and described is apparatus for setting and for stabilizing the platen in an impact type printer. The mechanism and arrangement enables the accomplishment of the objects and advantages mentioned above, and while a preferred embodiment of the invention has been disclosed herein, variations thereof may occur to those skilled in the art. It is contemplated that all such variations not departing from the spirit and scope of the invention hereof are to be construed in accordance with the following claims.
Claims (14)
1. A stabilizing mechanism for a platen in a printer having a frame and an impact type print element, said mechanism comprising guide means comprising a pair of generally rectangular members secured to the frame of the printer and having elongated apertures in a plate portion of each of said generally rectangular members, platen carrying means supported by the guide means and including members projecting through said apertures and adjustably coupled to said guide means, said platen carrying means including a wall member positioned at an angle relative to and having a surface opposed to a surface of the platen, said surfaces defining a space narrowing in one direction, a substantially spherical member positioned between and engaging the surface of the wall member and the surface of the platen, and resilient means urging the spherical member in the direction of the narrowing space between the surfaces for holding the platen in position upon impact by said print element.
2. The mechanism of claim 1 wherein the guide means comprises a pair of brackets secured to the frame of the printer.
3. The mechanism of claim 1 wherein the platen carrying means comprises a pair of carrier members adjustably coupled to the guide means.
4. The mechanism of claim 1 wherein the platen carrying means defines a well portion for accommodating the resilient means.
5. The mechanism of claim 1 wherein the spherical member includes a tenon portion integrally formed and accommodating the resilient means.
6. The mechanism of claim 1 wherein the guide means comprises a pair of brackets and each bracket defines an elongated opening for permitting adjustable movement of the platen carrying means.
7. The mechanism of claim 1 wherein the guide means comprises a pair of brackets and the platen carrying means comprises a pair of carrier members adjustably coupled to the brackets.
8. The mechanism of claim 1 including an adjusting element and wherein the guide means and the platen carrying means include wall portions for receiving the adjusting element.
9. Apparatus for holding a platen in position relative to a printing element in a printer, said apparatus comprising a pair of generally rectangular guide members adapted to be connected to the printer and having elongated openings in a plate portion of each of the guide members, a pair of platen carrying members operably supported by the respective guide members and including projections extending through said openings and adjustably coupled to said guide members, each of said platen carrying members including a wall having a surface positioned at an angle with respect to and opposed to a surface of the platen, said surfaces defining a space reducing in one direction, a spherical member engaging the surfaces of the wall and the platen, and means urging the spherical member in the direction of the reduction in space between the platen surface and the wall surface for retaining the platen in position upon printing operation by said printing element.
10. The apparatus of claim 9 wherein each of the platen carrying members includes a well portion for containing the urging means.
11. The apparatus of claim 9 wherein the spherical member includes an integrally formed tenon portion for containing the urging means.
12. The apparatus of claim 9 wherein each of the guide members defines at least one elongated opening for allowing adjustable movement of the respective platen carrying members.
13. The apparatus of claim 9 including an adjusting element and wherein each of the guide members and each of the platen carrying members includes wall portions for receiving the respective adjusting element.
14. The apparatus of claim 10 wherein the spherical member comprises a ball portion engaging the platen surface and the wall surface and the well portion defines a curved portion for receiving the spherical member upon depressing thereof against the action of the urging means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80402385A | 1985-12-02 | 1985-12-02 | |
| US804,023 | 1985-12-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1259521A true CA1259521A (en) | 1989-09-19 |
Family
ID=25188005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000516788A Expired CA1259521A (en) | 1985-12-02 | 1986-08-26 | Mechanism for stabilizing platen |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1259521A (en) |
-
1986
- 1986-08-26 CA CA000516788A patent/CA1259521A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |