US3747522A - Endless type carrier with type fingers connected by an endless strip and interposed viscous damping blocks - Google Patents

Endless type carrier with type fingers connected by an endless strip and interposed viscous damping blocks Download PDF

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Publication number
US3747522A
US3747522A US00188057A US3747522DA US3747522A US 3747522 A US3747522 A US 3747522A US 00188057 A US00188057 A US 00188057A US 3747522D A US3747522D A US 3747522DA US 3747522 A US3747522 A US 3747522A
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United States
Prior art keywords
type
damping
strip
tongues
carrying
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Expired - Lifetime
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US00188057A
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English (en)
Inventor
C Torrens
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Bull SA
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Societe Industrielle Honeywell Bull
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/20—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on endless bands or the like

Definitions

  • ABSTRACT For employment in an on-the-fly printer wherein printing is accomplished by selectively actuating print hammers aligned along a print line to drive a print-receiving member against opposed moving type elements, a typesupporting member wherein type elements are mounted on individual resilient tongues of a moving endless belt to travel along the print line and wherein damping means is provided to suppress vibration of the type-carrying tongues in the-plane of the print line.
  • a steel endless type-carrying belt of the kind provided with type-carrying tongues along its upper edge is employed by being stretched over two pulleys. It is necessary that such belt pass in front of a fixed platen or anvil, parallel to a print line of printing positions with a maximum constant velocity determined by the number of characters to be printed per second as provided by the specifications of the printer.
  • each typecarrying tongue The optimal shape and dimensions of each typecarrying tongue are determined so that when a type element at the end of a tongue receives the impact of a print hammer through the intermediary of at least one web of paper and an inking ribbon, such tongue deforms to enable the struck type element to remain opposite a printing position for the duration of the impact of the hammer. As soon as the type element is released, the associated tongue begins to vibrate in its plane at its fundamental period of resonance, which is not necessarily the same for all the tongues.
  • the minimum striking period for a type element may be very short. It is apparent that under these conditions, in order to obtain correct spacing for all of the printed characters, it is absolutely necessary to halt the vibration of each type-carrying tongue in an interval less than such minimum striking period.
  • a damping means for the type-carrying tongues which consists of an elastomer strip fastened toward the ends of the tongues can be suitable under certain conditions of employment.
  • certain disadvantages may appear.
  • the elastomer strip may not withstand the stresses it experiences, so that either it will break or some of the tongues will become detached from the belt by local separation thereof.
  • this solution does not provide sufficient independent between adjacent tongues,
  • each type-carrying tongue fomiing a part of an endless printing belt with an individual damping member.
  • Each of these members, or damping blocks, is attached to a strip which must not follow the relative displacements of the ends of the tongues in relation to the endless printing belt.
  • a metallic endless type-carrying belt which is intended to be driven at constant velocity by two pulleys of an on-the-fly printer provided with striking mechanisms.
  • Such belt has alongside one of its edges a plurality of partially cutout tongues, each bearing at its free end a printing type element in relief.
  • a damping strip which is also endless, of a material with high elastic strength is provided.
  • Each of a plurality of elastomer damping blocks is attached on one side thereof to a corresponding typecarrying tongue and on the other side thereof to said damping strip. the damping blocks are placed in such a position that the damping strip is disposed a distance below the level of the printing type elements.
  • the elastomer of the damping blocks must be se lected from among those providing viscous damping.
  • FIG. 1 is a perspective view of the endless typecarrying belt of the invention
  • FIGS. 2A, 2B and 2C are detailed views of a portion of the type-carrying belt of FIG. 1 in accordance with a first embodiment thereof;
  • FIGS. 3, 4 and 5 are cross-sectional views of a portion of the type-carrying belt of the invention according to second, third and fourth embodiments respectively.
  • the basic endless type-carrying belt 10, of known type, in FIG. 1 is shown in the orientation in which it is mounted on two pulleys in a printer, the pulleys not being illustrated. However, the vertical axes of rotation 11 and 12 of such pulleys are shown.
  • Belt 10 is provided with type-carrying tongues 13 along its entire upper edge. All of tongues 13 are identical and are spaced apart with a pitch P, for example of 3.91 mm. In the embodiment shown, however, belt 10 is provided with several complete sets of different characters, for example eight sets of 48 different characters or symbols, requiring 384 tongues 13.
  • the lower portion, or body, M of the endless belt has at least one welded seam, such as seam 15.
  • Belt 10 is provided with synchronization holes 16 toward its lower edge, each of which is located, for example, in alignment with the axis of a slot separating two adjacent tongues 13.
  • the printing type elements 17 appear on the exterior face of belt 10 because it is presumrned that in front of the front portion of the belt are disposed an inking ribbon or a carbon ribbon, a print receiving member in the form of at least one wide web of paper, and a series of print hammers selectively actuable in known manner. As indicated in the above-mentioned applications, the ends of type-carrying tongues 13 pass in the front of and in contact with a fixed platen or anvil, not shown, disposed along the length of the print line.
  • the linear velocity of the belt may be 6 m per second.
  • a damping strip 18, which is shown to greater scale in FIGS. 2A-2C, as well as damping blocks 19, one for each type-carrying tongue 13, are added to a type-carrying belt 10.
  • Strip 18 and blocks 19 are positioned on the internal face of tongues 13; i.e., on the face which is opposite that on which type elements 17 are mounted.
  • Strip 18 may be realized of steel foil of 0.05 to 0.15 mm thickness, whereas the thickness of belt 10 may be 0.15 mm.
  • the upper edge of strip 18 must'be suitably distant from the horizontal axis 21 of the printing type elements, for example 7 mm. If the length of tongues 13 to axis 21 is approximately 23 mm, the width of strip 18 may vary between approximately one-fourth and two-fifths of such length.
  • each damping block 19 is of uniform thickness, which may be between 0.5 and L5 mm.
  • Blocks 19 must be made of elastic material and furnish viscous damping. Therefore, blocks 19 may be of an isobutylene-isoprene copolymer (butyl) or a suitable polyurethane.
  • Each of blocks 19 is attached both to strip 18 and to a face of the corresponding tongue 13 by any appropriate bonding process, such as cementing or hot molding.
  • the width of each of blocks 19 may be equal to the width of a tongue 13, as shown in FIG. 2B, or may be different thereform. Further, the cross-section of a block 19 may be trapezoidal, instead of rectangular.
  • Strip 18 clearly must comprise a seam, which is located preferably between two blocks 19. This seam may be made by end-to-end welding, overlapping, cementing, etc.
  • the open length of strip 18 must be equal to that of type-carrying belt 10, whereby the tongues 13 undergo, without difficulty, a deflection toward the exterior in the curvilinear sections passing around the driving pulleys.
  • FIG. 2A illustrates a tongue, which bears a type element with the character 0, deflected to its maximum deformation, which is attained exactly at the completion of the impact by a hammer.
  • Each damping block is intended to very rapidly halt the vibration of a type-carrying tongue as soon as the type element is released by the hammer.
  • FIG. 2C indicating a uniform thickness of the damping blocks, is advantageous by reason of its simplicity of fabrication. However, it is apparent that the material of the block is poorly utilized since the lateral shearing stress is much greater at the upper level than at the lower level. The efficiency of the damping block is thereby reduced.
  • the damping strip 22 can have the same dimensions as those of strip 18, but its rectilinear cross-section is inclined relative to that of tongues 13 because each damping block 23 decreases in thickness toward the bottom thereof.
  • the thickness of blocks 23 can be selected to be maximum at the top and minimum at the bottom, whereby the shearing stress is nearly uniform over the entire height of a deflected block.
  • FIGS. 2C and 3 may demonstrate another defect, from the standpoint of the longitudinal motion, because strips 18 and 22 are not fully united to the body 14 of belt 10. Accordingly; when a type-carrying tongue is deflected to its maximum, the damping strip may transmit a perturbation to the adjacent tongues. This latter defect should be avoided as must as possible.
  • FIGS. 4 and 5 are directed toward eliminating the last-mentioned defect.
  • the widths of strips 24 and 26 are increased so that the lower edges thereof reach nearly to the roots of type-carrying tongues 13.
  • each block 25 has a decreasing thickness from top to bottom.
  • the thickness of block 25 at the level of its lower edge theoretically may be zero, it is preferable that such thickness be adequate to assure the adherence of block 25 both to strip 24 and tongue 13.
  • uniforrnity of the shearing stress over the entire height of a deflected block may be only approximate, but any relative longitudinal motion between strip 24 and the body 14 of the belt is virtually suppressed.
  • the dimensions and the materials of the elements are the same as those suitable for FIG. 4, with the difference that the cross-section of damping strip 26 is curvilinear.
  • the generatrix of this cross-section may be an arc of a circle or any other curve even better adapted to obtain uniformity of the shearing stress over the entire height of a deflected block 27.
  • Damping strips 18, 22, 24 and 26 may be realized of a glass fabric which withstands well longitudinal tensile stresses.
  • a metallic endless type-carrying belt intended to be driven at constant velocity by two pulleys of an on the-fly printer provided with striking print hammers, said belt having along one of its edges a plurality of partially cutout slots transverse to said belt length forming a plurality of tongues having roots at the unslotted portion of the belt and each bearing at its free end a printing type element in relief, wherein the improvement comprises: an endless damping strip of a material with high elastic strength and a plurality of separate damping blocks of a viscous elastic material one for each of said tongues, one side of each of said blocks being attached to a corresponding one of said type-carrying tongues and the other side of each of said blocks being attached to said damping strip, said blocks being attached to said tongues at a position locating the damping strip a distance below the level of said printing type elements which permits deflection of each typecarrying tongue in its plane during the impact by one of said print hammers.
  • damping blocks are made of a material providing viscous damping of vibrations.
  • damping block material is one of an isobutylaneisoprene copolymer or a polyurethane.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Handling Of Sheets (AREA)
  • Printers Characterized By Their Purpose (AREA)
US00188057A 1970-10-20 1971-10-12 Endless type carrier with type fingers connected by an endless strip and interposed viscous damping blocks Expired - Lifetime US3747522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7037768A FR2109483A6 (fr) 1970-10-20 1970-10-20

Publications (1)

Publication Number Publication Date
US3747522A true US3747522A (en) 1973-07-24

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ID=9062990

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Application Number Title Priority Date Filing Date
US00188057A Expired - Lifetime US3747522A (en) 1970-10-20 1971-10-12 Endless type carrier with type fingers connected by an endless strip and interposed viscous damping blocks

Country Status (9)

Country Link
US (1) US3747522A (fr)
JP (1) JPS5411731B1 (fr)
BE (1) BE774129A (fr)
DE (1) DE2152254C2 (fr)
FR (1) FR2109483A6 (fr)
GB (1) GB1350779A (fr)
IT (1) IT963005B (fr)
NL (1) NL169383C (fr)
SU (1) SU452955A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915279A (en) * 1973-11-29 1975-10-28 Ibm Printer type element deflection limiter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041964A (en) * 1960-01-11 1962-07-03 Ibm Continuous type belt
US3133497A (en) * 1962-01-09 1964-05-19 Bull Sa Machines High-speed printing apparatus
US3216348A (en) * 1961-10-20 1965-11-09 Clary Corp Hammer timing means in a high speed belt printer
US3416442A (en) * 1967-06-20 1968-12-17 Ibm Selective hammer actuating means in chain printers
US3638565A (en) * 1969-04-29 1972-02-01 Ibm Print type carrier
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1237816B (de) * 1963-08-24 1967-03-30 Ibm Deutschland Druckhammerantrieb fuer Schnelldrucker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041964A (en) * 1960-01-11 1962-07-03 Ibm Continuous type belt
US3216348A (en) * 1961-10-20 1965-11-09 Clary Corp Hammer timing means in a high speed belt printer
US3133497A (en) * 1962-01-09 1964-05-19 Bull Sa Machines High-speed printing apparatus
US3416442A (en) * 1967-06-20 1968-12-17 Ibm Selective hammer actuating means in chain printers
US3638565A (en) * 1969-04-29 1972-02-01 Ibm Print type carrier
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915279A (en) * 1973-11-29 1975-10-28 Ibm Printer type element deflection limiter

Also Published As

Publication number Publication date
NL169383B (nl) 1982-02-01
NL169383C (nl) 1982-07-01
DE2152254C2 (de) 1982-12-30
SU452955A3 (ru) 1974-12-05
JPS5411731B1 (fr) 1979-05-17
NL7114322A (fr) 1972-04-24
BE774129A (fr) 1972-02-14
DE2152254A1 (de) 1972-04-27
FR2109483A6 (fr) 1972-05-26
GB1350779A (en) 1974-04-24
IT963005B (it) 1974-01-10

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