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Патент USA US3038590

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June 12, 1962
3,038,580
J. HANDLEY _
TYPE PRINTING APPARATUS
Filed Jan. 9, 1961
2 >Sheets~Sheet 1
Inventor
J'- HANDLEY
By
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W
/
»
Attor- ey
June 12, 1962
TYPE PRINTING APPARATUS
Filed Jan. 9. 1961
3,038,580
J. HANDLEY
‘
2 Sheets-Sheet 2
Unite htates Patent @h‘ice
3,h38,58il
Patented June 12, 1962
1
carriage-return direction by means later to be described.
With the clutch constituted by portions 10 and 12 ener
3,038,580
TYPE PRINTING APPARA'I‘U5
gised, a magnetic coupling exists between these portions,
John Handley, Little Mai-land, Briar Hill,
Parley, England
so that clutch shaft 8 is driven in an anti-clockwise direc
Filed Jan. 9, 1961, 5er. No. 81,613
Claims priority, application Great Britain Ian. 9, 1960
4 Claims. (Cl. 197—82)
tion. Gear 9 is caused to free-wheel through de-energisa
tion of the clutch associated therewith and which clutch
is constituted by portions 9 and 11. In this condition
of rotation of shaft 8, the printing head 1 is driven in
This invention relates to improvements in or relating to
a letter-feed direction by means to be described later.
It is so arranged that only one clutch is energised at ‘a
type printing apparatus.
It is one of the objects of the present invention to
provide improved type printing apparatus in which the
effective mass of a carriage and type printing head ‘ac
commodated thereon is reduced by urging the carriage
in a letter-feed direction other than by well~known lead
screw means and using such lead-screw means only to
permit step~by-step movement of the carriage while it
is being urged thereof in the letter-feed direction, and
to drive the carriage in a direction reverse to the letter
feed direction.
According to one aspect of the present invention,
a time.
The means for urging the carriage 14 and the type
printing head 1 in the letter-feed direction indicated by
the arrow “A” is constituted by a cable drum 15 which
15 is a?ixed to shaft 8 and incorporates, extending from a
side thereof, two tongues 16 (FIG. 3) which are disposed
180° apart. FIG. 3 also shows in section two pairs of
tongues 17 which extend from the side of the bevel gear
18 of FIG. 1 which bevel gear is accommodated on clutch
20 shaft 8 and rotatable with respect thereto. Bevel gear
type printing apparatus is provided including a type print
18 and bevel gear 21 affixed to the lead-screw 22 consti
tute the means for driving the lead-screw 22. Each
ing head mounted on a carriage, a lead-screw engaged
tongue 16 of the cable drum 15 is disposed between a
by said carriage, means for urging said carriage in a
pair of tongues 17 of the bevel gear 18 and separated
letter-feed direction independently of said lead-screw, and 25 from the tongues of a pair by a resilient buffer 19 on
means co-acting with said lead-screw to effect step-by
one side and a compression spring 20 on the other side.
step movement of the carriage while it is being urged
A ratchet wheel 23 is affixed to the lead-screw 22 and is
by said urging means in the letter-feed direction.
arranged to be engaged by a pawl 24.
According to another aspect of the present invention,
The carriage 14 and the type printing head I mounted
type printing apparatus is provided comprising a type 30 thereon are arranged for movement in the carriage-return
printing head mounted on a carriage, means for urging
direction, indicated by the arrow “B,” though the provi
the said carriage in a letter-feed direction, a lead-screw
sion of a nut portion 25 affixed to the carriage 14 and
engaged by said carriage, means for driving said lead
engaging the lead-screw 22. Extending members 26 of the
screw independently of said carriage, spring means inter
carriage 14 are drilled to accommodate therethrough a
posed between said urging means and said driving means 35 rod 27 having a crotch portion 28 extending from one
for balancing the urging and driving forces applied to
end, which crotch portion accommodates the knuckle end
said carriage and lead-screw, ratchet and pawl means co
29 of a cable 30 and which knuckle is pivotally attached
acting with said lead-screw for arresting and releasing
to the crotch portion by a pin 31 extending through both
rotation of the said lead-screw to affect starting and
items. The other end of cable 30 is af?xed to the cable
stopping of said carriage while it is being urged by said 40 drum 15 in the position shown in FIG. 2, so as to be
urging means in the letter-feed direction, and spring means
incorporated in said urging means to accelerate movement
of the carriage after a stoppage.
'
wound up thereon or withdrawn therefrom. A spring ‘32
is accommodated on rod 27 ‘between the extending mem
bers 26 of the printing head 1 as are ‘adjusting nuts 33.
The invention will be better understood from the fol
lowing description read in conjunction with the accom
Operation of the apparatus is now to be described and
firstly with reference to FIG. 1. Initially the pawl 24 is
panying drawings in which:
in engagement with the ratch wheel 23 on lead-screw ‘22,
vFIG. l is a part sectional plan view of the apparatus;
thus rotation of the lead-screw 22 and movement of print
FIG. 2 is a part sectional side view of the apparatus;
ing head 1 is prevented. When shaft 2 is rotated to drive
and
clutch shaft 8 in an anti-clockwise direction, via gears 5
FIG. 3 is a part sectional end view of the apparatus. 50 and '6 and idler gear 7 therebetween and the energised
Referring now to the accompanying drawings and in
clutch constituted by portions 10 and 12 thereof, the cable
the ?rst instance to FIG. 1, the means for driving the
type printing head 1 mounted on a carriage 14 in the
letter-feed and carriage-return directions, and relative to
drum 15 commences to wind on cable 30 and causes
spring 32 on rod 27 to be compressed between adjusting
nuts 33 and the right-hand extending member 26 of the
a printing platen 13, comprises a shaft 2 continuously 55 carriage 14. At the same time springs 20 (FIG. 3), be
tween tongues 16 of cable drum 15 and tongues of pairs of
driven by electro-motor means (not shown) in the direc
tion indicated by the arrow C. Two gears 3 and 5 are
tongues 17 of bevel gear 18, are being compressed, since
pinned to the shaft 2 of which ‘gear 3 drives gear 4,
bevel gear 21 on lead-screw 22 is held stationary through
and of which gear 5 drives gear 6 by way of an idler
engagement of pawl 24 with ratchet-wheel 23 on the lead
gear '7. Gears 4- and 6 are free to rotate on a clutch 60 screw. When the pawl 24 is disengaged from ratchet
shaft 8 and are affixed respectively to portions 9 and 11)
wheel 23, the compressed springs 20 accelerate the lead
screw 22 and the compressed spring 32 accelerates car
of separate magnetic clutches, the other respective por
riage 14 and the printing head I mounted thereon through
tions 11 and 12 of which clutches are affixed to the clutch
shaft 8. With the clutch constituted by portions 9 and
a step in the letter-feed direction, indicated by the arrow
11 energised, a magnetic coupling exists between these 65 “A,” and relieves the load of the carriage on the lead~
screw. This step is terminated when the pawl 24 re
portions, so that clutch shaft 8‘ is driven in a clockwise
engages with a tooth of the ratchet Wheel 23 to bring the
direction, as viewed from the bottom of FIG. 1. Gear
6 is caused to free-wheel through de-energisation of the
carriage and printing head to rest. It will be readily
clutch associated therewith and which clutch is consti
understood that the force applied to urge the carriage 14
tuted by portions 10 and 12. In this condition of ro 70 and type printing head I mounted thereon and the force
tation of shaft 8 the printing head 1 is driven in the
applied to drive the lead-screw are balanced by the
3,088,580
spring 20 disposed between the drum 15 and the bevel
gear 18. Each time the pawl 24, which may be of the
type described in British Patent No. 808,703, is disen
gaged from the ratchet wheel 23 it is advanced to re
engage a succeeding tooth in the ratchet-wheel 23.
During each step-by-step movement of the carriage
14, the effect of backlash between the nut 25 thereon and
the lead-screw 22 is nulli?ed, since it is always taken
up by spring 32 which is being compressed prior to each
step of the printing head 1 through the pull of cable 30. 10
This step-by-step movement of the printing head 1
is repeated until the end of the line of print is com
pleted, termination of the movement being eifected by
the disengagement of the clutch constituted by portions 10
and 12 thereof. The clutch constituted by portions 9 and 15
[5
between said urging means and said driving means for
balancing the urging and driving forces applied to said
carriage and lead-screw, ratchet and pawl means co
acting with said lead-screw for arresting and releasing
rotation of the said lead-screw to effect starting and
stopping of said carriage in the said urgency thereof in
the letter-feed direction, and spring means incorporated
in said said urging means to accelerate movement of the
carriage after a stoppage.
2. Type printing apparatus including a type printing
head mounted on a carriage, a leadrscrew engaged by
said carriage, means for urging said carriage in a letter
feed direction independently of said lead-screw, means
for driving said lead-screw independently of said urging
means, means co-acting with said lead-screw to effect
step-by-step movement of the carriage while said car
11 thereof is thereafter energised, and clutch shaft 8
riage is being urged in the letter-feed direction, clutch
is rotated by shaft 2, via gears 3 and 4, in a clockwise.
means for applying driving forces to said urging
direction. In consequence the compressive forces exerted
means and to said means for driving said lead
on spring 32 and springs 20 ‘are released, nuts 33 move
back into engagement with the left hand extending mem 20 screw so as to move said carriage in a letter-feed direc
tion, and spring means interposed between said urging
ber 26 of the carriage 14, and tongues 16 on cable drum
means and driving means‘ to balance said forces applied
15 move back against resilient buffers 19 between the
thereto.
tongues 16 and one of each pair of tongues 17 on bevel
3. Type printing apparatus, as claimed in claim 2 in
gear 18. The lead-screw 22 is then driven by bevel gears
18 and 21 to move the carriage 14 and type printing 25 which second clutch means is provided to apply a force to
said lead-screw to drive said carriage in a direction re
head 1 thereon in the carriage-return direction, indicated
verse to said letter-feed direction.
by the arrow “B,” in preparation for the commencement
4. Type printing apparatus including a type printing
head mounted on a carriage, a lead-screw engaged by said
It will be readily understood therefore that during step
by-step operation of the apparatus, the following ad 30 ' carriage for controlling the movement thereof, releasable
means for holding said lead-screw against rotation, drive
vantages accrue: the load on the nut 25 is relieved; the
of a new line of print.
mass to be moved is reduced, since a pull independent
of the lead-screw 22 is exerted on the carriage; the back
means, ?rst spring means connecting said drive means with
said lead-screw for rotation of said lead-screw when said
lash between nut 25 and lead-screw 22 is taken up con
holding means is released to cause movement of sair car
tinuously during movement; and the frictional forces 35 riage in a letter-feed direction, and second spring means
connecting said carriage with said drive means for urging
said carriage in a letter-feed direction independently of
said lead-screw, whereby when said holding means in
released, said ?rst spring means accelerates the rotation of
set-up between the nut 25 and lead-screw 22 and guide
means (not shown) are utilised for retarding the print
ing head 1 during arrestment of the movement thereof
through the engagement of pawl 24 with ratchet wheel 23.
It is to be understood that the foregoing description 40
said lead-screw and said second spring means aids in
of speci?c examples of this invention is not to be con
accelerating the movement of said carriage.
sidered as a limitation of its scope.
What we claim is:
References Cited in the ?le of this patent
1. Type printing apparatus comprising a type print
ing head mounted on a carriage, means for urging the
said carriage in a letter-feed direction, a lead-screw en
gaged by said carriage, means for driving said lead-screw
independently of said carriage, spring means interposed
UNITED STATES PATENTS
559,325
635,957
2,606,641
Ellis _______________ __ Apr. 28, 1896
Fair?eld et al. ______ __ Oct. 31, 1899
Kleinschmidt ________ __ Aug. 12, 1952
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