GB2027394A - Print wheels - Google Patents
Print wheels Download PDFInfo
- Publication number
- GB2027394A GB2027394A GB7924449A GB7924449A GB2027394A GB 2027394 A GB2027394 A GB 2027394A GB 7924449 A GB7924449 A GB 7924449A GB 7924449 A GB7924449 A GB 7924449A GB 2027394 A GB2027394 A GB 2027394A
- Authority
- GB
- United Kingdom
- Prior art keywords
- print wheel
- central portion
- hub
- bonding member
- depending
- 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.)
- Withdrawn
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 229920003023 plastic Polymers 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 13
- 239000003292 glue Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
- B41J1/28—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers
- B41J1/30—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers with the types or dies moving relative to the carriers or mounted on flexible carriers
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A print wheel 10 has affixed thereto a hub 20 fabricated of a first material (e.g. rubber) and a central portion 12 fabricated of a second material (e.g. plastics). Fixing the hub to the print wheel includes the steps of positioning the hub 20 on top of the central portion 12 with the cavity 24 aligned with the opening 14, positioning a ring 28 having at least one depending portion 32 on top of the peripheral flange portion 26 of the hub, the depending portion(s) 32 being fabricated of the second material, applying a downward force to the ring 28 such that the depending portion(s) 32 thereof pierce(s) through the peripheral flange portion 26 of the hub, and (ultrasonically) welding the depending portion(s) 32 to the central portion 12. <IMAGE>
Description
SPECIFICATION
Improvements in and relating to print wheels
This invention relates to print wheels of the kind comprising a central portion having an opening formed therein and a hub having a central portion including a cavity therein and a peripheral flange portion extending from the central portion, the hub being positioned on top of the central portion of the print wheel with the cavity aligned with the opening. This enables a motor drive shaft to project through the opening into the hub cavity.
The invention also relates to a method of affixing the hub to the central portion of the print wheel.
Prior art print wheels of the above kind normally have their central portions fabricated or a plastics material and have a hub fabricated or a rubber-like material bonded to the central portion of the print wheel by an adhesive material, such as glue or the like. Although the glue bond has worked reasonably well, there have been instances when the heat of the drive motor has caused the bond to fail, thereby enabiing the hub to become disengaged from the print wheel. This may then be followed by the print wheel itself becoming disengaged from the motor drive shaft.
It is desirable, therefore, to provide a print wheel wherein the hub is more permanently affixed to the print wheel central portion.
To this end, from one aspect, the invention provides a method for affixing a hub to a print wheel having a central portion, wherein said hub has a central portion including a cavity formed therein and a peripheral flange portion extending from said central portion, and wherein the central portion of said print wheel has an opening therein, said method comprising the steps of:
(a) positioning the hub on the top of the central portion of said print wheel with said cavity aligned with said opening;
(b) positioning a bonding member having at least one depending portion on top of said hub;
(c) applying a downward force to said bonding member such that said at least one depending portion thereof pierces through the peripheral flange portion of said hub; and
(d) welding said at least one depending portion of said bonding member to the central portion of said print wheel.
In accordance with a preferred embodiment, the hub is fabricated of rubber and the depending portion of the bonding member and the central portion of the print wheel are fabricated of mutually weldable materials, such as plastics material. Further, the bonding member preferably comprises a ring having a plurality of spaced depending portions, and the welding step includes ultrasonically welding the plurality of depending portions of the ring to the central portion of the print wheel.
The invention also contemplates a print wheel fabricated in accordance with the above method and, from another aspect, the invention provides a print wheel comprising a central portion having a central opening formed therein, a hub having a central portion including a cavity formed therein
and a peripheral flange portion extending from said central portion, said hub being positioned on top of the central portion of said print wheel with said cavity aligned with said opening and a bonding member positioned on top of the peripheral flange portion of said hub and having at least one depending portion projecting through said peripheral flange portion and welded to the central portion of said print wheel.
By welding the depending flange portions of the ring to the print wheel central portion, preferably by ultrasonic welding techniques, no failures of the bond have occured in tests conducted to date and the hub has been reliably maintained affixed to the print wheel.
In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, in which.
Figure 1 is a front plan view of a print wheel according to the present invention;
Figure 2 is a side elevational view of the print wheel of Figure 1;
Figure 3 is a rear plan view of the print wheel of
Figure 1;
Figure 4 is a magnified view of a portion of the print wheel of Figure 1 prior to affixing a ring and hub to the central portion of the print wheel;
Figure 5 is a bottom plan view of the ring shown in Figure 4; and
Figure 6 is a cross-sectional view of the print wheel of Figure 1 taken along lines 6-6 of Figure
1.
Referring to Figures 1-3, a print wheel 10 of the present invention is shown. The print wheel 10 is commonly referred to as a "daisy-wheel" print wheel and is especially useful in so-called "daisywheel printers," such as the type disclosed in U.S.
Patents Nos. 3,954,1 63 and 4,091,911. As is conventional, the print wheel 10 includes a central portion 12 preferably fabricated of a plastic material and having a central opening 1 4 (Figure 3). A plurality of character bearing spokes 1 6 project radically outwardly from the central portion 12 and may also be fabricated of the same plastic material. The characters (not shown) are all formed on the front face of the spokes 16 (Figure 1). A keyway 18 is also formed in the central portion 1 2 for receiving a locking member (not shown) located on a printer (not shown) in order to prevent relative movement between the print wheel 10 and a motor drive shaft (not shown) engaged through the opening 14, as is conventional.
The print wheel 10 also includes a hub 20 preferably fabricated of a rubber-like material. As best shown in Figures 4 and 6, the hub 20 has a central portion 22 including a cavity 24 formed therein. The hub 20 also has a peripheral flange portion 26 extending from the central portion 22.
The hub 20 is positioned on top of the central portion 12 of the print wheel 10 with the cavity 24 aligned with the opening 14 so that the shaft of a drive motor may be inserted and held therein.
The method of affixing the hub 20 to the print
wheel 10 in accordance with invention will now
be described with reference to Figures 4-6. As
shown, a bonding member 28, preferably in the
form of a ring is provided that is preferably made
of mutually weldable material as the central
portion 12 of the print wheel, e.g. plastic. The ring
has an inner diameter preferably slightly greater
than a cap portion 30 of the hub 20 in order to be placed down over the hub onto its peripheral flange portion 26. The ring 28 has at least one, and preferably a plurality (e.g. 8) spaced teeth 32 depending downwardly from the bottom surface of the ring 28.
In accordance with the method, a downward force is applied to the ring 28 such that the teeth
32 pierece through the rubber peripheral flange portion 26 of the hub 20. Then, ultrasonic energy
is applied to the ring 28 causing the teeth 32 to be
ultrasonically welded to the upper surface of the print wheel central portion 12. Ultrasonic welding
is preferred since no heat need be applied which might cause unwanted thermal molecular flow of the plastic material. Any conventional ultrasonic welding machine may be used to both apply the
requisite downward force and ultrasonic energy to cause the teeth 32 to pierce the peripheral flange portion 26 and be ultrasonically welded to the central portion 12. An exemplary
machine that has worked successively is the
Model 460 ultra-sonic welder manufactured by the Bronson Sonic Power Company.
The ring 28 so welded to the print wheel central portion 12 with the hub peripheral flange portion 26 essentially sandwiched therebetween provides a very effective and reliable affixation of the hub 20 to the print wheel 10. Tests have shown no failure of the bond with temperatures exceeding 1000C, well above the temperature high during normal operation of the print wheel drive motor and printing mechanisms.
Claims (11)
1. A method for affixing a hub to a print wheel
having a central portion, wherein said hub has a central portion including a cavity formed therein and a peripheral flange portion extending from said central portion, and wherein the central
portion of said print wheel has an opening therein,
said method comprising the steps of:
(a) positioning the hub on top of the central
portion of said print wheel with said cavity aligned
with said opening;
(b) positioning a bonding member having at
least one depending portion on top of said hub;
(c) applying a downward force to said bonding
member such that said at least one depending
portion thereof pierces through the peripheral flange portion of said hub; and
(d) welding said at least one depending portion
of said bonding member to the central portion of
said print wheel.
2. A method according to Claim 1, wherein said
bonding member comprises a ring and said
welding step includes ultrasonicaily welding said
at least one depending portion of said ring to the
central portion of said print wheel.
3. A method according to Claim 1, wherein said
bonding member has a plurality of spaced
depending portions and said welding step includes
ultrasonically welding said plurality of depending
portions of said bonding member to the central
portion of said print wheel.
4. A method according to Claim 1, wherein said
hub is fabricated of rubber and the at least one
depending portion of said bonding member and the central portion of said print wheel are fabricated of plastic, and wherein said welding
step includes ultrasonically welding the at least
one depending portion of said bonding member to the central portion of said print wheel.
5. A method for affixing a hub to a print wheel substantially as hereinbefore described with reference to the accompanying drawings.
6. A method of making a print wheel including affixing a hub to the print wheel as claimed in any preceding claim.
7. A print wheel comprising a central portion having a central opening formed therein, a hub having a central portion including a cavity formed therein and a peripheral flange portion extending from said central portion, said hub being positioned on top of the central portion of said print wheel with said cavity aligned with said opening, and a bonding member positioned on top of the peripheral flange portion of said hub and having at least one depending portion projecting through said peripheral flange portion and welded to the central portion of said print wheel.
8. A print wheel according to Claim 7, wherein said bonding member has a pluarlity of spaced depending portions each projecting through the peripheral flange portion of said hub and being welded to the central portion of said print wheel.
9. A print wheel according to Claim 7 or 8, wherein said hub is fabricated of rubber and the depending portion or portions of said bonding member and the central portion of said print wheel are fabricated of plastic.
10. A print wheel according to Claim 7, 8 or 9, wherein said bonding member comprises a ring.
11. A print wheel according to Claim 7, 8, 9 or 10, wherein a plurality of character bearing spokes project radially outwardly from said central portion of the wheel.
1 2. A print wheel constructed substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93030778A | 1978-08-02 | 1978-08-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2027394A true GB2027394A (en) | 1980-02-20 |
Family
ID=25459177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7924449A Withdrawn GB2027394A (en) | 1978-08-02 | 1979-07-13 | Print wheels |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5521294A (en) |
| CA (1) | CA1105407A (en) |
| CH (1) | CH643489A5 (en) |
| GB (1) | GB2027394A (en) |
| IT (1) | IT1205224B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3308786C1 (en) * | 1983-03-09 | 1984-03-01 | Alfred Ransmayer & Albert Rodrian, 1000 Berlin | Type plate for typewriters |
| US4516867A (en) * | 1982-09-22 | 1985-05-14 | Schacht Roy A | Printing wheel connecting and adjusting means |
| DE3427761A1 (en) * | 1984-05-22 | 1985-11-28 | Caracteres S.A., Neuchâtel | TYPE CARRIER DISC FOR PRINTING MACHINES |
| US4674898A (en) * | 1984-11-05 | 1987-06-23 | The Fern Group, Inc. | Printwheel |
| US4723856A (en) * | 1983-02-28 | 1988-02-09 | Ing. C. Olivetti & C., S.P.A. | Device for coupling a character-carrying disc to a selector motor |
-
1979
- 1979-05-17 CA CA327,950A patent/CA1105407A/en not_active Expired
- 1979-07-13 GB GB7924449A patent/GB2027394A/en not_active Withdrawn
- 1979-07-23 CH CH682979A patent/CH643489A5/en not_active IP Right Cessation
- 1979-07-26 JP JP9431679A patent/JPS5521294A/en active Pending
- 1979-07-26 IT IT24713/79A patent/IT1205224B/en active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4516867A (en) * | 1982-09-22 | 1985-05-14 | Schacht Roy A | Printing wheel connecting and adjusting means |
| US4723856A (en) * | 1983-02-28 | 1988-02-09 | Ing. C. Olivetti & C., S.P.A. | Device for coupling a character-carrying disc to a selector motor |
| DE3308786C1 (en) * | 1983-03-09 | 1984-03-01 | Alfred Ransmayer & Albert Rodrian, 1000 Berlin | Type plate for typewriters |
| DE3427761A1 (en) * | 1984-05-22 | 1985-11-28 | Caracteres S.A., Neuchâtel | TYPE CARRIER DISC FOR PRINTING MACHINES |
| US4674898A (en) * | 1984-11-05 | 1987-06-23 | The Fern Group, Inc. | Printwheel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5521294A (en) | 1980-02-15 |
| CH643489A5 (en) | 1984-06-15 |
| IT1205224B (en) | 1989-03-15 |
| CA1105407A (en) | 1981-07-21 |
| IT7924713A0 (en) | 1979-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |