US2587824A - Rubber drive for printing hammers - Google Patents

Rubber drive for printing hammers Download PDF

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Publication number
US2587824A
US2587824A US188517A US18851750A US2587824A US 2587824 A US2587824 A US 2587824A US 188517 A US188517 A US 188517A US 18851750 A US18851750 A US 18851750A US 2587824 A US2587824 A US 2587824A
Authority
US
United States
Prior art keywords
hammer
printing
latch
pawl
rubber
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
Application number
US188517A
Other languages
English (en)
Inventor
Charles G Dudis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCR Voyix Corp
National Cash Register Co
Original Assignee
NCR Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NCR Corp filed Critical NCR Corp
Priority to US188517A priority Critical patent/US2587824A/en
Priority to FR1048526D priority patent/FR1048526A/fr
Priority to DEN4479A priority patent/DE894328C/de
Priority to CH296192D priority patent/CH296192A/fr
Priority to GB23001/51A priority patent/GB701239A/en
Application granted granted Critical
Publication of US2587824A publication Critical patent/US2587824A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/30—Springs

Definitions

  • This invention relates to improvements in operating means for printing hammers for accounting machines.
  • the object of the invention is to provide a rub-- ber spring drivefor. a printing hammer.
  • a specific object of the invention' is to provide arubber connection between the drive means and the printing hammer fol-actuating the printing hammer in its printing operation.
  • Another object of the invention is to provide a single drive member having a plurality of rubber bushings secured thereto, and a printing hammer secured to each rubber bushing, whereby the printing hammers can all be cocked from a single po'wersource, together with means to select one or more of the hammers to be'cocked by said drive member,
  • the invention includes certain novel features of construction and combinations of parts, a preferred form .or embodiment of which is hereinafter de-.
  • Fig. 1 is a side elevation of the hammer selectin and operating mechanism
  • Fig. 2 is a graph charting the movements of a printing hammer when released for a printing operation
  • Fig. 3 is a detailview of the printing hammer cocking mechanism
  • Fig. 4 is a sectional detail view showing how thehammers are mounted on the drive member and illustrates the rubber spring bushing connections for three of a plurality of hammers;
  • Fig. 5 shows a modified means for selecting printing hammers for operation.
  • the rubber springs comprise bushings of rubber, which are used in place of wellknown steel springs for forcing the'printing hammer against type characters to provide the proper printing pressure.
  • the novel construction also provides an improved "printing operation in that the alinement of the face of the printing hammer is better main tained, due to the fa'ct'that the driving forceior the hammer is located around the axis of movement of the hammer.
  • the driving force is applied at a point remote from. the axis of the hammer and offset from the center of the hammer platen face.
  • a plurality of printing hammers l0 (Figs. 1 and 4) arev provided... the number of hammers varying according to the number of columns of, data to be printed.
  • the hub of each hammer IDs comprises a sleeve I I, in. which a rubber bushing I2 is inserted, and an inner sleeve 13 is inserted issued. to Picaquerez, and 1,782,770,
  • 9 are provided with rollers 20, coacting with a pair of cam plates 2
  • the hammers l may be provided with a split hub 23 (Fig. 1) to provide for radial adjustment of the hammer I0 on the sleeve instead of forming the sleeve directly on the hammer, as shown in Fig. 4.
  • a screw 24 provides a means for clamping the split hub 23 on the sleeve M. This radial adjustment is provided to vary the energy stored in the rubber bushing, so that the impact of the printing blow can be varied according to the printing to be effected, such as the number of carbon copies desired.
  • Each hammer H! is provided with a stud 25, which is engageable' with a latch pawl 26 when the latter is "selectively released in a manner presently described.
  • Thellatches 26 are pivoted on a. shaft 21, and each latch 26 is flexibly connected. to an arm 26, secured on the shaft 21.
  • a spring 29 is stretched between a stud 30 on each latch pawl 26 and a stud 3
  • the shaft 21 (Fig. 3) is operated during machine operations by a pair of cams secured to the main shaft 22.
  • One end of a pitman 36 is slidably mounted on the shaft 22, between the cam plates 35, and the pitman 36 has thereon two oppositely facing roller 31 coacting with the cam plates 35.
  • the left-hand end (Fig. 3) of the pitman 36 is pivoted to an arm 38 on the shaft 21.
  • the pitman. is moved, first to the right (Fig. 3), and then back to the position shown, for each printing operation.
  • the, cam plates 35 are constructed to oscillate the pitman twice during 7 each machine operation. Movement of the pitman to the right rocks the shaft 21 counter-clockwise (Fi s. 1 and 3 which.
  • the latch 45 is notched to engage a. stud 41 on the latch pawl26.
  • the notch in the pawl 45 is held in engagement with the stud 41 by a stud 48, which is engaged by a finger 49 on the latch 45..
  • the stud 48 is. carried by an arm 50 secured to the. shaft 46.
  • is connected to the stud48 and a stud 52 on the latch 45 for a flexible connection whereby the latch 45 is selectively withdrawn from engagement with the stud 41.
  • the pawl 45 is selectively withdrawn from engagement with thestud 41 under control of a notched disk 53 secured to a shaft 54.
  • the shaft 46 is rocked counter-clockwise (Fig. l) and carries the stud 48 therewith and, through the spring 5
  • a notch 55 is in the path of movement of a finger 56 on the pawl 45,.”
  • the pawl 45 m'ovesto withdraw the notch therein from engagement with the stud 41, thus freeing the latch pawl 26 to position the shoulder 39 thereon into the path of movement of the stud 25.
  • no notch 55 lies in the path of the finger 56, the notch in the pawl 45 is not withdrawn from the stud 41,and therefore the latch pawl 26 is held inthe-iposition illustrated in- Fig. 1.
  • the disks 53 are selectively positioned by a differential mechanism controlled by manipulative devices, in the manner disclosed in said patent, for selectively determining which hammer I0 is to operate in a given machine operation for the purposes described in said patent. It is sufficient to say that, when a notch 55 is positioned in the path of the finger 56, the hammer will operate toeifect a prinfting record, and, when no notch 55 is in the path of the finger 56, no printing will be performed.
  • the characteristics of the rubber used for a given printing mechanism will vary with its design, its weight, and the force required to obtain a clear printed impression, and the proper size and characteristics of the rubber bushing must be determined by experiment.
  • a plurality of printing impressions can be made during each machine operation, the number being controlled by the shapes of the cams 2
  • these cams are shaped to "cause two impressions to be taken by each cocked and released printing hammer during every machine operation.
  • Fig. 2 line A indicates the normal position of the hammer.
  • Line B indicates the rise of the hammer when the stud 25 contacts the shoulder 39 of the latch pawl 26, and the length of line B represents the time during which the hammer is held by the latch pawl 26 and the rubber bushing vl2 is being twisted by the shaft M, to store energy therein.
  • the 1atch pawl 26 is pulled ofi the stud 25; and the hammer I is snapped upwardly to strike the type character wheel.
  • Fig. 2 illustrates the vibrations of the hammer when operated by the mechanism as illustrated; that is, when the cam plates 2
  • the present invention also adapts itself to a simpler hammer-selecting means for columnar printing.
  • Any number of hammers I0 can be arranged on the common shaft I 4, nd only one operating mechanism need be furnished for actuating all the hammers singly, or in any combinationyor all at one time;
  • the selection of hammers is determined'bv the differential positioning of the selecting disks 53, one being provided for each latch 45, and one latch 45 is provided for each latch pawl 26.
  • FIG. 5 discloses a modified form of hammer lug 12 is secured to'the plate 68, and the lug is tapped to receive an adjusting screw 66.
  • the shoulder 61 can be adjusted on the periphery of the hammer hub to vary the torque when the machine is oper-' ated.
  • a selecting pawl 69 is rotatably mounted on the shaft 46, which is provided with a finger 49 in the same manner as the latch pawl 45.
  • the finger 49 is held in engagement with the stud 48 on the arm 50 by the spring 5
  • the pawl 69 is provided with an upright finger 10 movable into, or out of, the path of the shoulder 67. i
  • the position assumed by the finger i0 is controlled by the notched disk 53 in the same manner as in the first form described above.
  • the notched disk is provided with one or more notches 55
  • the selecting pawl 59 is provided with a finger 55.
  • a printing mechanism of the class described the combination of a printing hammer having a hub; a drive shaft; a rubber spring to actuate the hammer, said rubber spring comprising a bushing bonded to the inner wall of the hub of the printing hammer and to the outer wall of the drive shaft a latch pawl movable to en: gage the printing hammer to holdfthe printing hammer as the drive shaft is operated to t rsionf ally shear-the rubber bushing to create torsional energy in the rubber bushing; means to there; after withdraw the latch pawl from engagement with'the hammer to release the said torsional 'energy'and.
  • a printing mechanism of the class described, the combination Of a printing hammer having a hub; a drive shaft; a rubber spring to actuate the hammer, said rubber spring comprising abushing bonded to the inner wall of the hubof the printing hammer and to the outer wall of the drive shaft; a latch pawl movable to engage the printing hammer to hold the printing hammer as the drive shaft is operated to torsionally shear the rubber bushing to create potential energy in the rubber bushing; means to thereafter withdraw the latch pawl from engagement with the hammer to release the said energy and thereby operate the hammer for making a printing stroke; and means to operate the drive shaft to first torsionally shear the rubber bushing and to return the drive shaft and the bushing immediately the hammer makes its printing stroke to prevent the hammer from rebounding sufiiciently to cause a second printing stroke.
  • a printing hammer having a hub; a drive shaft; a rubber spring to actuate the hammer.
  • said rubber spring comprising a bushing bonded to the inner wall of the hub of the printing hammer and to the outer wall of the drive shaft whereby the printing hammer can be operated by the drive shaft; a latch pawl movable to engage the printing hammer.
  • a printing hammer having a hub; a drive shaft; a rubber spring to actuate the hammer.
  • said rubber spring comprising a bushing bonded to the inner wall of the hub of the printing hammer and to the outer wall of the drive shaft whereby the printing hammer can be operated by the drive shaft; a latch.
  • pawl movable to engage the printing hammer to hold the printing hammer against movement when the drive shaft is operated; a latch normally engaging and holding the latch pawl in a position where the latch pawl cannot engage the printing hammer; means comprising a differentially settable' notched control disk coacting with the pawl to selectively control the release of the pawl from the latch pawl to cause the latch V pawl to move into engagement with theprinting hammer whereby the hammer is selectively held as the drive shaft is operated to torsionally shear the rubber bushing to create potential energy in the rubber bushing; means to withdraw the latch pawl from'engagement with the printing. hammer after the said energy has been created to thereby cause the rubber bushing to operate the hammer for making a printing stroke; and means to operate the drive shaft.
  • a printing mechanism of the class described the combination of a printing hammer having a hub; a drive shaft: '2. rubber spring to actuate the hammer, said rubber spring comprisinga bushing bonded to the inner wall of the hub of the printing hammer and to the outer wall of the drive shaft whereby the printing hammer can be operated by the drive shaft; a springurged latch pawl movable to engage and hold the printing hammer against movement when the drive shaft is operated; a spring-urged latch normally engaging and holding the latch pawl in a position where the latch pawl cannot engage the printing hammer; a differentially settable notched control plate; means on the latch engageable with the notched control plate to selectively control the movements of the latch whereby the latch may be disengaged from the latch pawl to release the latch pawl for movement'into engagement with the hammer, whereby the hammer is held when the drive shaft is operated to twist the rubber bushing and thereby create potential energy in the rubber bushing; means
  • a printing hammer In a printing mechanism of the class described, the combination of a printing hammer, operating means for the printing hammer consisting of a rubber bushing connected to the printing hammer and to a drive shaft therefor, a means to selectively arrest movement of the hammer, means to rock the drive shaft to create potential energy in the rubber bushing when the hammer is held, and means to withdraw the arresting means after said energy has been created to cause the force to operate the printing hammer.
  • a pivoted printing hammer operating means for the printing hammer comprising a rubber bushing connected to the hammer around the axis of its pivotal movement, a drive means also connected to the rubber bushing, means to selectively arrest the printing movement of the hammer, actuating means to actuate the drive means while the hammer is arrested to store energy in the bushing, and. means to withdraw the arresting means after said energy has been stored in the bushing to cause the hammer to make a printing stroke.
  • a printing hammer operating means for the printing hammer consisting of a rubber bushing connected to the printing hammer and to a drive shaft therefor, a means to selectively arrest movement of the hammer, means to rock the drive shaft in one direction to create potential energy in the rubber bushing when the hammer is held, and means to withdraw the arresting means after the said energy has been created to cause the energy to operate the printing hammer, said means to rock 10 the drive shaft movable in a reverse direction immediately the hammer is operated.
  • a pivoted printing hammer operating means for the printing hammer comprising a rubber bushing connected to the hammer around the axis of its pivotal movement, a drive means also connected to the rubber bushing, means to selectively arrest the printing movement of the hammer, actuating means to actuate the drive means in one direction while the hammer is arrested to store energy in the bushing, and means to withdraw the arresting means after said energy has been stored in the bushing to cause the hammer to make a printing stroke, said means to actuate the drive means movable in a reverse direction immediately the hammer starts its printing stroke.

Landscapes

  • Printing Methods (AREA)
  • Impact Printers (AREA)
  • Rotary Presses (AREA)
US188517A 1950-10-05 1950-10-05 Rubber drive for printing hammers Expired - Lifetime US2587824A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US188517A US2587824A (en) 1950-10-05 1950-10-05 Rubber drive for printing hammers
FR1048526D FR1048526A (fr) 1950-10-05 1951-09-27 Mécanisme d'impression pour machines comptables ou analogues
DEN4479A DE894328C (de) 1950-10-05 1951-09-29 Druckwerk fuer Buchungs- und aehnliche Buchhaltungsmaschinen
CH296192D CH296192A (fr) 1950-10-05 1951-10-03 Mécanisme d'impression d'une machine de bureau.
GB23001/51A GB701239A (en) 1950-10-05 1951-10-03 Printing mechanism for accounting and like machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US188517A US2587824A (en) 1950-10-05 1950-10-05 Rubber drive for printing hammers

Publications (1)

Publication Number Publication Date
US2587824A true US2587824A (en) 1952-03-04

Family

ID=32232894

Family Applications (1)

Application Number Title Priority Date Filing Date
US188517A Expired - Lifetime US2587824A (en) 1950-10-05 1950-10-05 Rubber drive for printing hammers

Country Status (5)

Country Link
US (1) US2587824A (fr)
CH (1) CH296192A (fr)
DE (1) DE894328C (fr)
FR (1) FR1048526A (fr)
GB (1) GB701239A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3126823A (en) * 1962-05-24 1964-03-31 benson
US4261663A (en) * 1978-11-27 1981-04-14 Knut Grimnes Machines for writing braille type

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3126823A (en) * 1962-05-24 1964-03-31 benson
US4261663A (en) * 1978-11-27 1981-04-14 Knut Grimnes Machines for writing braille type

Also Published As

Publication number Publication date
CH296192A (fr) 1954-01-31
GB701239A (en) 1953-12-23
FR1048526A (fr) 1953-12-22
DE894328C (de) 1953-10-22

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