CA1139985A - Hand operated label printing machine - Google Patents
Hand operated label printing machineInfo
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- CA1139985A CA1139985A CA000387332A CA387332A CA1139985A CA 1139985 A CA1139985 A CA 1139985A CA 000387332 A CA000387332 A CA 000387332A CA 387332 A CA387332 A CA 387332A CA 1139985 A CA1139985 A CA 1139985A
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Abstract
HAND OPERATED LABEL PRINTING MACHINE
ABSTRACT OF THE DISCLOSURE
A hand operated label printing machine in which a series of labels are incrementally fed onto a printing platen in response to the squeezing of a hand lever so that they may be imprinted with selected indicia. The hand labeler is equipped with a constant pressure printing mechanism interposed between the hand lever and the frame of the hand labeler. That mechanism is comprised of a pressure applying assembly in the form of a biased cam pivotally mounted to the hand lever and a pressure receiving assembly also in the form of a biased cam pivotally mounted to the machine frame. The former assembly is brought into abutment contact with the latter assembly at their cam surfaces, while the hand lever is being squeezed and the cams are then hindered from pivoting following abutment. The label printing force is the force that has to be applied for the former assembly to ride over the latter assembly which occurs when one of the assemblies resiliently deforms. The hand labeler also has an ink supply device, comprising a holder that holds two inking rollers. The ink supply device is movable to bring the inking rollers into and out of contact with the types of the printing device to ink them. The ink supply device is actuated by a mechanism which is comprised of a combination of a cam pivotally attached to the machine frame and a roller pivotable with the printing head supporting printing lever for being received in the cam and for pivoting the cam with the printing lever. A link joins the cam with the holder, so that pivoting of the cam moves the holder. Guide grooves in the machine frame regulate the inking roller motion along different loci. The link has a slot in it which prevents the holder from linear protrusion to the front of the labeler frame.
ABSTRACT OF THE DISCLOSURE
A hand operated label printing machine in which a series of labels are incrementally fed onto a printing platen in response to the squeezing of a hand lever so that they may be imprinted with selected indicia. The hand labeler is equipped with a constant pressure printing mechanism interposed between the hand lever and the frame of the hand labeler. That mechanism is comprised of a pressure applying assembly in the form of a biased cam pivotally mounted to the hand lever and a pressure receiving assembly also in the form of a biased cam pivotally mounted to the machine frame. The former assembly is brought into abutment contact with the latter assembly at their cam surfaces, while the hand lever is being squeezed and the cams are then hindered from pivoting following abutment. The label printing force is the force that has to be applied for the former assembly to ride over the latter assembly which occurs when one of the assemblies resiliently deforms. The hand labeler also has an ink supply device, comprising a holder that holds two inking rollers. The ink supply device is movable to bring the inking rollers into and out of contact with the types of the printing device to ink them. The ink supply device is actuated by a mechanism which is comprised of a combination of a cam pivotally attached to the machine frame and a roller pivotable with the printing head supporting printing lever for being received in the cam and for pivoting the cam with the printing lever. A link joins the cam with the holder, so that pivoting of the cam moves the holder. Guide grooves in the machine frame regulate the inking roller motion along different loci. The link has a slot in it which prevents the holder from linear protrusion to the front of the labeler frame.
Description
HAND OPE~ ED LABEL PRINTING MACHXNE
This app.lication is a division of Canadian Serial No. 326,076, iled April 23, 1~79.
BAC~GROUND OF THE INVENTION
Field of the Invention The present invention relates to a hand operated label printing machine or a hand labeler and particularly to a constant pressure printing mechanism and an ink supply mechanism for use ~ith a hand labeler.
In a hand labeler, a series of pressure sensitive labels, which are temporarily adhered to a strip .~ of carrier paper, are incrementally fed onto a printing platen in response to the squeezing of an actuating lever, so that the labels may he imprinted with selected indicia. The printed labels are peeled one by one from the carrier paper and are adhered to a commoAity.
Description of the Prior Art In one form of a conventional constant pressure printing mechanism for a hand labeler, a printing head is carried on the leading end of a printing lever9 w}lich may be integral with a hand operated lever, so that the printing head is moved together ~ith the printing lever down to~ard the printing platen by the squeezing operation of the hand lever, thus printing the labels ~hich have been fed onto the platen.
This app.lication is a division of Canadian Serial No. 326,076, iled April 23, 1~79.
BAC~GROUND OF THE INVENTION
Field of the Invention The present invention relates to a hand operated label printing machine or a hand labeler and particularly to a constant pressure printing mechanism and an ink supply mechanism for use ~ith a hand labeler.
In a hand labeler, a series of pressure sensitive labels, which are temporarily adhered to a strip .~ of carrier paper, are incrementally fed onto a printing platen in response to the squeezing of an actuating lever, so that the labels may he imprinted with selected indicia. The printed labels are peeled one by one from the carrier paper and are adhered to a commoAity.
Description of the Prior Art In one form of a conventional constant pressure printing mechanism for a hand labeler, a printing head is carried on the leading end of a printing lever9 w}lich may be integral with a hand operated lever, so that the printing head is moved together ~ith the printing lever down to~ard the printing platen by the squeezing operation of the hand lever, thus printing the labels ~hich have been fed onto the platen.
- 2 In such a convcntional hand labeler, ho-iever, -the printing pressure of the labels is directly dependen~
upon the strength and duration of the squcezing force ~hat has been appliecl ~o the hand lever, with the resultant disadvantage that the density of the imprints differs among the labels in accordance with the intensity of the squeez;ng force.
To eliminate this pro~lem, one constant pressure printing mechanism is shown in U.S. Patent ~o. 3,911,817.
In the constant pressure printing mechanism disclosed therein, a compression spring is interposed bet~een the hand operated lever and the printing lever, ~hich levers are made separate from each other rather than being integrated.
An ink applying device, which is biased for rotation by a return spring, is provided at a front portion of the hand labeler and the ink applying device is urged into abutment contact ~ith the types of the printing head. When the hand lever is squeezed, the aforementioned compression spring is compressed to store a compression force.
When the stored compression force exceeds or overcomes the restraining limit of the return spring of the ink applying device, then the printing lever and the printing head are urged down to the platen~ ~hile also pushing a~ay the ink applying device, by thc force of thc com-pression spring. Printing of the labels upon the platenis thus effected. As a result, the label printing is accomplished only by the stored force of the compression spring, irrespective o~ the intensity o~ the lever squeezing force, so that the printing operation can al~ays be performed under a preset constant pressure. This has the advantage that the imprints on the labels can be less irregular.
In the above-described constant pressure printing mechanism, ho~ever, the printing is caused solely by the elastic force of the compression spring ~hich is ~:~3~
upon the strength and duration of the squcezing force ~hat has been appliecl ~o the hand lever, with the resultant disadvantage that the density of the imprints differs among the labels in accordance with the intensity of the squeez;ng force.
To eliminate this pro~lem, one constant pressure printing mechanism is shown in U.S. Patent ~o. 3,911,817.
In the constant pressure printing mechanism disclosed therein, a compression spring is interposed bet~een the hand operated lever and the printing lever, ~hich levers are made separate from each other rather than being integrated.
An ink applying device, which is biased for rotation by a return spring, is provided at a front portion of the hand labeler and the ink applying device is urged into abutment contact ~ith the types of the printing head. When the hand lever is squeezed, the aforementioned compression spring is compressed to store a compression force.
When the stored compression force exceeds or overcomes the restraining limit of the return spring of the ink applying device, then the printing lever and the printing head are urged down to the platen~ ~hile also pushing a~ay the ink applying device, by thc force of thc com-pression spring. Printing of the labels upon the platenis thus effected. As a result, the label printing is accomplished only by the stored force of the compression spring, irrespective o~ the intensity o~ the lever squeezing force, so that the printing operation can al~ays be performed under a preset constant pressure. This has the advantage that the imprints on the labels can be less irregular.
In the above-described constant pressure printing mechanism, ho~ever, the printing is caused solely by the elastic force of the compression spring ~hich is ~:~3~
-3-coactive ~ith the printing le-vcr. As the number of labels imprinted increases, the resultant printing pressure is reduced in proportion to the gradual weakening of the com-pression spring. Therefore~ this conventional prin~ing mechanism cannot be free from the disadvantage that the desired clear prints of the labels with present density can-not be expected after many labels have been imprinted.
In other constant printing pressure mechanisms, it is known to have a pressure applying assembly on one relatively moving element of the hand labeler apply pressure to and eventually override a prcssure receiving assembly on another relatively moving element of the hand labeler. This engagement between assemblies stops the hand operated lever or operating lever of the labeler from being operated to cause label imprinting until after a predetermined squeezing force is applied to the hand lever. Once the assemblies over-ride each other, then the types on the printing head imprint a label with a constant printing pressure. Examples of ~his can be found in my copending applications, U.S. Serial No.
866,991, filed January 5, 1978, now U. S. Patent 4,207,81G, and U. S. Serial No. 909,431, filed May 25, 1978, now U. S.
Patent 4,206,704. Ilowever, it is desired to make these assemblies simpler and more efE;cient than those in the above-mentioned applications.
Also in a hand labeler, inking of the types that imprint the label strips should be accomplished with a pre-determined inking pressure, using inking rollers that follow a predetermined pathway across the faces of the types being inked, and wherein the mechanism by which the inking is accom-plished operates efficiently and effectively and does not protrude so far beyond the front of the hand labeler as to interfere with a view of the label being applied by the hand labeler at the front of the body of the hand labeler. Various inking assemblies have been devised, including my own U. S.
application Serial No. 830,806, filed September 6, 1977, cor-responding to Canadian application Serial No. 286,094 filed September 6, 1977. Again, however, the simplici~y in P ~ ' inking means for accomplishing the above noted purposes and further ~or assuring tha-t the inking mechanism does not protrude in front o~ the labeler body is not as great as possible.
SUM~ARY OF THE INVENTION
The present invention seeks to provide a hand labeler which is free from many o~ the above-described drawbacks concomitant with the prior art.
The invention as disclosed provides a hand labeler which is of simple construction which reduces the production cost and which is also sufficiently durable.
One aspect of the present invention seeks to provide a hand labeler, which is equipped with an ink supply mechanism of the dichroic type, for ensuring the uniform and smooth application of two different colors of ink to two rows of types of a printing device by the two inking rollers impregnated with two kinds of ink.
According to a particular feature of the present inven-tion in this divisional application the hand operated label printing machine includes an ink supply device carrying an inking roller holder holdincJ at least two inking rollers and made movable to bring the inking rollers into and out of contact with the types o~ the printing device so as to supply ink thereto. The ink supply device includes starting means which are coactive with the printing lever.
The starting means engage a cam device that is linked to the inking roller holder, whereby movement of the printing lever moves the inking rollers over the types. Guide means regulate the movement of the two inking rollers along different loci.
More particularly, the invention to which the claims in this divisional application are directed pertains to a label print-ing machine, including a machine frame, an operating lever pivotally connected to the machine frame and movable from a rest position toward an operative position, and a printing lever connected with the operating lever for moving between a respective rest position when the operating lever is in the rest position and a printing position as the operating leve~ moves to the operative position.
The machine includes a printing device, having inkable imprinting types carried on the printing lever and a platen is connected to the machine frame and is in opposition to the types as the printing device moves to the printing position, whereby the types will engage a label on the platen when the printing lever is in the printing position. An ink supply device is provided for inking the types, ~3~
and including an inking roller holder for holding two separa-ted inking rollers, turning means connected with the inking roller holder for moving the inking rollers over the types and a starting cam which is plvotally connected to the machine frame at a different pivot than the opera~ing lever. The starting cam is also pivotally connected to the -turning means such that movement of the starting cam, in turn, moves the turning means. The starting cam includes a recess and a starting element is on the printing lever and pro-jects into the starting cam recess, the starting element being in engagement with the starting cam for causing pivoting of the start-ing cam, and the starting cam recess being shaped to permit relative shifting of the starting element with respect to the starting cam as a result of their pivoting about different respective pivots.
Guide means are supported in the frame for guiding the inking rol-lers along different respective paths and over respective types asthe inking rollers are moved by the turning means and the inking roller holder.
BRIEF DESCRIPTION OF THE DRAWINGS
Other aspects, advantages and features of the present invention will become apparent from the following description taken in connection with the accompanying drawings, in which:
Fig. 1 is a partially sectional, side elevational view showing a hand labeler, which is equipped with both of a constant pressure print ng mechanism and an ink supply mechanism according to the present invention, with the ]abeler frame on the viewing side removed;
Fig. 2 is a longitudinal sectional view of a ~ragment of Fig. 1, showing the constant pressure printing mechanism of Fig. li Fig. 3 is an e~ploded perspective view of the constant pressure printing mechanism of Figs. 1 and 2; and Fig. 4 is a longitudinal, partially sectional view of a fragment of Fig. 1, showing the ink supply mechanism of Fig. 1.
DESCRIPTION OF THE PREFERRED EMBODI~ENTS
Referring to Fig. 1, a hand operated label printing mac-hlne or a hand labeler exemplifying the features of the present in-vention includes a pair of longitudinally split grip levers 2 each of which is integral with and extends rearwardly (to the right) from a respective one of a pair of labeler frames 1, which are jux-taposed to each other at both sides of the labeler body. The grip levers 2 are fastened in registration with each other by means of `~
pins (not shown). The labeler frames 1 a.re fas-tened to each . other by various means including a tr~nsverse pivot pin 8.
: ~ hand lever 3 is pivotally mounted on the pi.n 8 so tha-t the lever may be manually squeezed to and released away flom the grip levers 2. The leading ~left hand) end of tlle hand lever 3 is bifurcated to form a pair of printing levers ~ which carry t~o printing heads 40a and 40b of a printing device B. The printing heads 40a and 40b both carry imprinting types and the respective desired types 41a and 41b can be exposed do~nwardly. The printing heads 40a and 40b are fixed by means o fastening screws 43 i.n the longitudinal slots 4~ which are formed in the printing levers 4 such that the longitudinal positions and relative spacing of heads 40a~ 40b can be adjusted.
A return spring 7 is mounted under tension bet~Jeen a spring holding portion S that extends integrally from the hand le~er 3 and a spring holding pin ~ that ls fixed to the inside lialls o~ t}~e grip levers 2. The . 20 return spring 7 continuolsly biases both the hand lever 3 and the printin~ levers 4 to rotate clockl~ise about the pivot pin 8 until they reach their rest posit;ons ~her~
the contact surfaces 4a of the printing levers 4 abut the pressure receivillg portion la of the labeler frames 1.
At tlle positions to wh:ich thc typcs 41a and 41b can be lo~ered there is a platen 9 .~hich is rotatably mounted on the main shaft 10 of a rotatable fecd roller 11. The platen 9 is ixed in position by closing a bottom cover 13. The cover 13 and the platen 9 are so constructed that they can be pivoted ~hen a continuous strip of labels L is threaded to prepare for the label printing operation. The bottom cover 13 is pivotally connected to the shaft i3a ~hich is located at the leading (left hand~ end of the labeler frame 1. lYhen a locking mechanism 14 is released the bottom cover 13 can be turned clockl~ise about the shaft 13a clo-~nlardly to -the outside. This frees the platen 9 to be turned counter-clock~ise about thc main shaft 10 dol~nardly to , ..
~, ' .
the outside. Then, the label thread:ing mechanism D com-prised of a label starting member 80, a label holding member 81 and a label. holding ring 82, all of which are made coactive with the platen 9, is actuated to ensure the smooth threading of the label strip L. See, for instance, U. S. application Serial No. 837,193 filed September 28, 1977, corresponding to Canadian application 286,457 filed September 9, 1977.
Above the leading ~left hand) end portion of the platen 9, there is affixed a pair of label holding members 15a, which project from the inner walls of the labeler frames 1. Below the leading end portion of the platen 9, there is a carrier paper or backing strip holding member 15b, which is mounted on the upper side of the bottom cover 13 so as to hold the carrier paper I.b tha~ has been peeled from the label strip L. As a result, there is defined a reversing direction, thin passage for the label strip L
and the carrier paper Lb between the label holding members 15a and the platen 9 and then between the platen 9 and the carrier paper holding member 15b. In addition J the bottom cover 13 carries guide rollers 16 and 17 for directing the carri0r paper out the bottom of the labeler.
There is mounted rotatably on the shat 13a a label applying roller 18 which can apply individual lables ln a series of labels A to a commodity as they are separated from the carrier paper Lb when the carrier paper Lb direction of travel is reversed in the vicinity of the leading end of the platen 9.
.The trailing end of the label strip L is dispensed from a label supply ro]ler E which is ro~atably mounted on a roller holding bracket l9a that is located above the labeler frames 1. There is also located at this side of Fig. 1 a shorter roller holding bracket 19b which is juxtaposed to the longer bracket l9a so as to prevent the label strip L from being loosened or le~ off to this side while it is being unrolled.
ln operation, the label strip 1. is advanced in increments of one label length through the passage between the feed roller 11 and the label holding member 81 oE the label threading mechanism D onto the platen 9. Meanwhile, the label strip L is being drawn by the feecl roLler ll, WhiC}l is in~ermittently turned through a clrivc mechanism (not shown) in response to the releasing of the hand lever 3 after it has been manually squeezed. For this feeding purpose, the label strip L is formed with a series of engage-; 10 ment slits which are spaced apart a distance equal to the length of the labels La so that they may be engaged by the feed pawls 12 that are formed equidistantly apart upon the outer circumference of the feed roller 11. As a result, the ; label strip L can be aclvanced UpO]I the platen 9.
A constant pressure printing mechanism A
according ~o the present invention is now described. The constant pressure printlng mechanism A ensures that the labels La of the label strip L are printed under a constant printing pressure with the indicia on -the types 41a and ~lb of the printing heads 40a and 40b of the printing device B. As better seen in ~igs. 2 and 3, thc constant pressure printing mechanism A is princil~ally comprised of a prcssure applying assembly 20 and a pressure receiving assembly 26.
The pressure applying assembly 20 is positioned in the vicinity of the pivot pin 8 of the hand lever 3 and includes a pair of upright pressure cams 21, a cam shaft 25 and a torsion spring 25. The ~pressure cams 21 are correspondingly shaped, upstanding and spaced apart.
They are made of a synthetic resin having resiliency.
They are formed at their head portions with resiliently yieldable cam surfaces 21a. At the same forwardly facing side of their leg portions the cams have respective contact surfaces 21b. The leg portions of the pressure _9_ cams ~1 together define an aligned pair of shaft holes 23, in ~ihich the cam shaft 24 is inserted. The spring 25 is mounted on the shaft 24. Both ends of the cam shaft 24 are fixed to the side walls of the hand lever 3 by means o snap rings ~not sho~n). The torsion spring 25 has one end that is held on or abuts against a spring holding portion 22 of the pressure cam 21 and has its other end held likewise on a pressure receiving surface 3a of the hand lever 3. As a result, the pressure cams 21 are always biased to rotate clockwise about the cam shaft 24 until they assume their upright p~sitions, where their contact surfaces 21b abut against the pressure receiving surface 3a of the hand lever 3.
The pressure receiving assembly 26 is arranged close to the leg portions of the grips levers 2. The pressure receiving assembly 26 is comprised of a pair of down-~ardly directed pressure receiving cams 27, a pair of pressure receiving rollers 28, a cam shaft 32 and a torsion spring 33. The pressure receiving cams 27 may also be made of a synthetic resin having resiliency. The t-~o cams 27 are correspondingly shaped, upstanding and spaced apart, but closer together than cams 21. The cams 27 are each formed at their lo~er portions with a re-spective pair o~ shaft holes 29 and 31. The roller shaft 30 is fitted in the shaft holes 29 and it is fixed in the pressure receiving cams 27 by means of snap rings ~not shownl. The roller shaft 30 rotatably bears the paired pressure receiving rollers 28 at its both ends. The pair of pressure receiving rollers 28 are arranged outside of the pressure receiving cams 27 and are so placed and spaced that each roller 28 can be moved into abutment engagement with a respective cam surface 21a of a pressure cam 21. The cam shaft 32 is fitted in the other pair of aligned shaft holes 31. The cam shaft 32 is fixed to the grip levers 2 of the labeler frames 1 b~ means of snap rings (not shown).
The torsion spring 33 is mounte~ at the center portion of the cam shaft 32. The torsion spring 33 has one end that is held on or abu~s against the pressure receiving cams 27 and has its other end held on the pressure receiving surface 2a of the grip levers 2. As a result, the pressure receiving cams 27 are also always biased to rotate clock-~ise about the cam shaft 32 by the action of the torsion spring 33 until they assume their lo-~ered positions, where their pressure applying suraces 27a abut against the pressure receiving surface 2a of the grip levers 2.
The operation of the constant pressure printing mechanism A is now described. In the rest position, the hand lever 3 is manually squeezed toward the grip levers 2 against the biasing force of the return spring 7. This turns the printing levers 4 do-~ward, i.e. counter-clock~iise, about the pivot pin 8 to carry the printing heads 40a and 40b toward the platen 9 until the types 41a and 41b abut against the inking rollers 69a and 69b of different colors of an ink supply mechanism C, ~hich are described later in more detail. ~s a result, the dichroic inkillg rollers 69a and 69b are made to roll over the types 41a and 41b, respectively, while the inking rollers are regulated by a link mechanism and by roller guide means so that the inking rollers can supply the types t~ith tt~o colors or kinds of ink.
After the inking, ~hen the hand lever 3 is squeezed further, the pressure applying assembly 20, carried along by the hand lever 3, moves its cam surfaces 21a into abutment contact ~ith the pressure receiving rollers 28 of the pressure receiving assembly 26.
Further squeezing of the hand lever 3 lifts and turns the pressure receiving cams 27 of the pressure receiving assembly 26 counter-clock-~ise about the cam shat 32 against the biasing force of the torsion spring 33 so - that the pressure applying surface 27b formed on the top of the pressure receiving cams 27 is brought into abutment --ll--contact ~;tll the stationary press-lre receiving surface 2b of the grip levers 2. ~y this time, the contact surfaces 21b of the pressure cams 21 of the pressure applying assembly 20 are abutting against the pressure receiving surface 3a of the hand lever 3 and are applying the ma~imum pressllre ~.hich must be overcome to accomplish the printing.
en a greater squeezing force is applied to the hand lever 3, the cam surfaces 21a of the pressure cams 21 are forced against the pressure receiving rollers 28 until the resilient cams 21 are idented, which establishes a strain or stores compression energ~ hen the cam surfaces 21a of the cams 21 are adequately compressed or when the pressure receiving rollers 28 are enabled to ride over the cam surfaces 21a due to the resiliency of the surfaces 21a, the printing heads ~Oa and 40b are released from their retention by the contact bet~/een the pressure cams 21 and pressure receiving rollers 28. Of course, it could be the rollers 28 that are resiliently deformable and that are compressed and deformed, instead o~ the cam surfaces 21a, or even both of the rollers 28 and the surfaces could be deformable. Once the overriding occurs, as sho~n in double-dotted lines in ~ig. 2, the types ~la and ~lb are freed to move into abutment contact with the label then on t~e platell ~, t}-us effecting label printing.
After the printing operation, ~hen the hand lever 3 is released, the printing heads 40a alld 40b can be returned to their initial, rest positions by the action of the return spring 7. During the return motion of the constant pressure printing mechanism A, the pressure receiving assembly 2~ is biased clock-~ise under the influence of the torsion spring 33 so that the pressure cams 21 of the pressure applying assembly 20 are kept in contact ~ith the pressure receiving rollers 2S.
~lo-~ever, the pressure applying assembly 20 is able to pass the rollers 2S, by shifting slightly counter-cloc~ise '4~
so that the assembly 20 is allo~Yed to restore to its initial rest position without any special resistance by the biasing force of ~he torsion spring 25.
As will be apparent from the foregoing de-scription, with minimal modification to their conEig-urations, the positions of the pressure applying and pressure receiving assemblies coul~ be exchanged so that the pressure applying assembly would be on the grips 2 and the pressure receiving assembly would be on the hand lever.
The resistance applying ride-over means or printing pressure regulating means, comprised of the pressure applying assembly and the pressure rcceiving assembly, provides a number of advantages:
If the hand lever is squeezed with excessively strong force, the excessively high printing pressure is damped by the interaction bet~Yeen the pressure applying assembly and the pressure receiving assembly until the pressure is reduced to a preset constant printing pres-sure. If the hand lever is squeezed too ~Yeakly, the lotY
printing pressure is accumulated or awaited by the interaction bet~een the assemblies until the sque~zing force is increased to achieve the constant printing pressure. Thus~ it is possible to accomplish label printing at a constant pressure at all times and accordingly to ensure that the imprints on the labels have no irregularity and are highly accurate.
Since the pressure cams of the pressure applying assembly are made of a resilient, synthetic resin, the constant pressure printing mechanism can be quite durable, and thereby assure that the proper printing pressure Yill be applled ~or a longer time than a conventional mechanism, that uses the elasticity of a spring, t~ould permit.
3~
As a result, the constant pressure printing mechanism according ~o the present invention can exhibit prominent effects, especially when it is applied to a P.O.S. (i.e., Point-o-Sales~ system, in which the printed indicia are automatically read out by means of an optical character reader.
The in~ supply mechanism C according to another feature of the present invention operates in connection with the motions of the printing levers 4. As best seen in Fig. 4, the ink supply mechanism C is comprised of a pair of startillg rollers 50 that are carried on the leading ends of the printing levers 4, a pair of starting cams 51 that -form a portion of a link mechanism, a pair of link frames 56, an inking roller holder 61 holding the inking rollers 69a and 69b, each for providing ink of a respective color, a holder frame 59 providing connection betl~een inking roller holder 61 and the link mechanism, and roller guide means ~hich are pro~ided for at least one of the inking rollers 69a and 69b so that thcse rollers 69a and 69b can roll over their respective types 41a and 41b.
The pair of starting rollers 50 are rotatably mounted Oll the shat 50a ~hich is transversely supported in the supporting portions 50b e~tending from the leading ends of the printing levers 4. The paired cams 51 are engageable with the respective starting rollers 50. The cams 51 are attached to each other across thc transverse direction of the hand labeler by means of a connecting member (not shown). The cams 51 include recesses 52, in which the starting rollers 50 are to be received. The recesses 52 include lower inclined surfaces 53, which are shaped to allow the starting rollers 5Q to roll over them. The lower portions of the starting cams 51 are hingedly attached to the labeler frames 1 by means of a stationary pin 54. The upper portions of the cams 51 are hingedly attached to the lin~ frames 56 by means of a ~3~
movable pin 55. The paired link frames 56 have their upper portions pivotally conneoted to the movable pin 55 and their lower portions pivotally connected to the connecting pin 59a of ~he holder frame 59. The link frames 56 have a pair of curved slots 58 located in-~ermediate their length and within which a stationary pin 57 fixed to the labeler frames 1 is received.
The in~ing roller holder 61 is made of a synthetic resin ~hich is resilient and the holder 61 is supported by means of the connectin~ pin 59a of the holder frame 59 and by a connecting plate 59b. The holder 61 carries an inking roller engaging member 64 which is ixed to the supporting portion 62 of the holder 61 by a pin 63. The inking roller supporting member 67b of the second inking roller 69b is removably mounted on the engaging member 64. The secondary inking roller 69b is rotatably mounted on an inking roller shaft 68b ~hich is mounted in the supporting member 67b. The elastic, resilient receiving member 66 comprises a spring of a synthetic resin which can provide a roller squeezing pressure of constant level ~hen the inking roller 69b contacts the corresponding types ~lb. The elastic receiving rnember 66 extends from the supporting portion 62 of the holder 61 and its free eIid abuts against the bottom of the inking roller supporting member 67b.
At the trailing (right hand) end of the inking roller holder 61, an in~ing roller engaging member 65 is formed. The inking roller supporting member 67a of the primary inking roller 69a is removably engaged with the member 65. The inking roller 6~a is also made rotatable on its, shaft 68al which is mounted transversely in the supporting member 67a thereof.
The guide means for the first inking roller 69a includes a pair of engagement collars 60 mounted on both sides of the holder frame 59 and includes a pair of guide grooves 70 ormed in the inner :alls of the juxtaposed a~
labeler frames 1. The guide grooves 70 are sized and shaped so that the primary inking roller 69a only rolls on the types 41a of the first printing hcad 40a thereby to ink these types but *he roller 69a thereafter is moved do-~nward to prevent it from contacting the types 41b of the second printing head 40b. There are no guide grooves for the second inXing roller 69b, as the receiving member 66 urges it into position.
The inking rollers 69a and 69b are preferably inked such that the first roller 69a has a black color whereas the second roller 69b has a red color. The inking rollers 69a and 69b may alternatively have the inverse dichroic arrangement. Moreover, they may both be inked with one black color or with t-~o other colors, if desired, etc.
The operation of the ink supply mechanism C is now described in the following ~ith reference to Figs. 1 and 4. l~hen the hand lever 3 is squeezed to~ard the grip levers 2, the printng levers 4 carrying the printing heads 40a and 40b of the printing device B are turned do~n~ardly, i.e., counter-cloc]c~iise, about the pivot pin 8. As the printing levers 4 are mo~ed dol~n, the starting rollers 50 at the leading (left hand) end of the printing levers are carTied to $urn the starting cams 51 clockwise about the stationary pin 54. As a result, the link frames 56 which are hinged to the starting cams 51 by means of the movable pin 55 are turned clocXwise about the stationary pin 57 so that the holder ~rame 59 and the inking roller holder 61 are carried by the link frames 56 to the front of the body of the hand labeler The first inking roller 69a has its engagement collars 60 guided forl~ard by the guide grooves 70, and the second inking roller 69h is carried -forl~ard ~hile being supported by the elastic receiving member 66. Initially, the firs-t inking roller 69a rolls on the types 41a of the irst printing head 40a and thereby applies its black ink to the types 41a. After that, the first inking roller 69a is guided belol~ or apart from the types 41b of the second inking roller 40b. Meanwhile, the second inkin~ roller 69b i$ biased up-~ardly by the elas-tic receiving member 66 to roll over the types 41b of the second printing head 40b and thereby applies its red ink to the types 41b.
l~hen the hand lever 3 is squeezed further, the engagement collars 60 of the first inking roller 69a are abruptly dropped at the curved portions of the guide grooves 70 so that the inking roller 69a can pass around the second types 41b.
I~hen the starting rollers 50 are moved further dol~nward as the lever squeezing procceds, the rollers 50 are positioned on the inclined surfaces 53 of the starting cams 51, and this pressure engagement of the rollers 50 on the surfaces 53 causes the link frames 56 to have their curved slots 58 moved to the right or rear~ardly along the stationary pin 57 untll they assume their fallen positions, as sho~n in double-dotted lines in Fig.
In other constant printing pressure mechanisms, it is known to have a pressure applying assembly on one relatively moving element of the hand labeler apply pressure to and eventually override a prcssure receiving assembly on another relatively moving element of the hand labeler. This engagement between assemblies stops the hand operated lever or operating lever of the labeler from being operated to cause label imprinting until after a predetermined squeezing force is applied to the hand lever. Once the assemblies over-ride each other, then the types on the printing head imprint a label with a constant printing pressure. Examples of ~his can be found in my copending applications, U.S. Serial No.
866,991, filed January 5, 1978, now U. S. Patent 4,207,81G, and U. S. Serial No. 909,431, filed May 25, 1978, now U. S.
Patent 4,206,704. Ilowever, it is desired to make these assemblies simpler and more efE;cient than those in the above-mentioned applications.
Also in a hand labeler, inking of the types that imprint the label strips should be accomplished with a pre-determined inking pressure, using inking rollers that follow a predetermined pathway across the faces of the types being inked, and wherein the mechanism by which the inking is accom-plished operates efficiently and effectively and does not protrude so far beyond the front of the hand labeler as to interfere with a view of the label being applied by the hand labeler at the front of the body of the hand labeler. Various inking assemblies have been devised, including my own U. S.
application Serial No. 830,806, filed September 6, 1977, cor-responding to Canadian application Serial No. 286,094 filed September 6, 1977. Again, however, the simplici~y in P ~ ' inking means for accomplishing the above noted purposes and further ~or assuring tha-t the inking mechanism does not protrude in front o~ the labeler body is not as great as possible.
SUM~ARY OF THE INVENTION
The present invention seeks to provide a hand labeler which is free from many o~ the above-described drawbacks concomitant with the prior art.
The invention as disclosed provides a hand labeler which is of simple construction which reduces the production cost and which is also sufficiently durable.
One aspect of the present invention seeks to provide a hand labeler, which is equipped with an ink supply mechanism of the dichroic type, for ensuring the uniform and smooth application of two different colors of ink to two rows of types of a printing device by the two inking rollers impregnated with two kinds of ink.
According to a particular feature of the present inven-tion in this divisional application the hand operated label printing machine includes an ink supply device carrying an inking roller holder holdincJ at least two inking rollers and made movable to bring the inking rollers into and out of contact with the types o~ the printing device so as to supply ink thereto. The ink supply device includes starting means which are coactive with the printing lever.
The starting means engage a cam device that is linked to the inking roller holder, whereby movement of the printing lever moves the inking rollers over the types. Guide means regulate the movement of the two inking rollers along different loci.
More particularly, the invention to which the claims in this divisional application are directed pertains to a label print-ing machine, including a machine frame, an operating lever pivotally connected to the machine frame and movable from a rest position toward an operative position, and a printing lever connected with the operating lever for moving between a respective rest position when the operating lever is in the rest position and a printing position as the operating leve~ moves to the operative position.
The machine includes a printing device, having inkable imprinting types carried on the printing lever and a platen is connected to the machine frame and is in opposition to the types as the printing device moves to the printing position, whereby the types will engage a label on the platen when the printing lever is in the printing position. An ink supply device is provided for inking the types, ~3~
and including an inking roller holder for holding two separa-ted inking rollers, turning means connected with the inking roller holder for moving the inking rollers over the types and a starting cam which is plvotally connected to the machine frame at a different pivot than the opera~ing lever. The starting cam is also pivotally connected to the -turning means such that movement of the starting cam, in turn, moves the turning means. The starting cam includes a recess and a starting element is on the printing lever and pro-jects into the starting cam recess, the starting element being in engagement with the starting cam for causing pivoting of the start-ing cam, and the starting cam recess being shaped to permit relative shifting of the starting element with respect to the starting cam as a result of their pivoting about different respective pivots.
Guide means are supported in the frame for guiding the inking rol-lers along different respective paths and over respective types asthe inking rollers are moved by the turning means and the inking roller holder.
BRIEF DESCRIPTION OF THE DRAWINGS
Other aspects, advantages and features of the present invention will become apparent from the following description taken in connection with the accompanying drawings, in which:
Fig. 1 is a partially sectional, side elevational view showing a hand labeler, which is equipped with both of a constant pressure print ng mechanism and an ink supply mechanism according to the present invention, with the ]abeler frame on the viewing side removed;
Fig. 2 is a longitudinal sectional view of a ~ragment of Fig. 1, showing the constant pressure printing mechanism of Fig. li Fig. 3 is an e~ploded perspective view of the constant pressure printing mechanism of Figs. 1 and 2; and Fig. 4 is a longitudinal, partially sectional view of a fragment of Fig. 1, showing the ink supply mechanism of Fig. 1.
DESCRIPTION OF THE PREFERRED EMBODI~ENTS
Referring to Fig. 1, a hand operated label printing mac-hlne or a hand labeler exemplifying the features of the present in-vention includes a pair of longitudinally split grip levers 2 each of which is integral with and extends rearwardly (to the right) from a respective one of a pair of labeler frames 1, which are jux-taposed to each other at both sides of the labeler body. The grip levers 2 are fastened in registration with each other by means of `~
pins (not shown). The labeler frames 1 a.re fas-tened to each . other by various means including a tr~nsverse pivot pin 8.
: ~ hand lever 3 is pivotally mounted on the pi.n 8 so tha-t the lever may be manually squeezed to and released away flom the grip levers 2. The leading ~left hand) end of tlle hand lever 3 is bifurcated to form a pair of printing levers ~ which carry t~o printing heads 40a and 40b of a printing device B. The printing heads 40a and 40b both carry imprinting types and the respective desired types 41a and 41b can be exposed do~nwardly. The printing heads 40a and 40b are fixed by means o fastening screws 43 i.n the longitudinal slots 4~ which are formed in the printing levers 4 such that the longitudinal positions and relative spacing of heads 40a~ 40b can be adjusted.
A return spring 7 is mounted under tension bet~Jeen a spring holding portion S that extends integrally from the hand le~er 3 and a spring holding pin ~ that ls fixed to the inside lialls o~ t}~e grip levers 2. The . 20 return spring 7 continuolsly biases both the hand lever 3 and the printin~ levers 4 to rotate clockl~ise about the pivot pin 8 until they reach their rest posit;ons ~her~
the contact surfaces 4a of the printing levers 4 abut the pressure receivillg portion la of the labeler frames 1.
At tlle positions to wh:ich thc typcs 41a and 41b can be lo~ered there is a platen 9 .~hich is rotatably mounted on the main shaft 10 of a rotatable fecd roller 11. The platen 9 is ixed in position by closing a bottom cover 13. The cover 13 and the platen 9 are so constructed that they can be pivoted ~hen a continuous strip of labels L is threaded to prepare for the label printing operation. The bottom cover 13 is pivotally connected to the shaft i3a ~hich is located at the leading (left hand~ end of the labeler frame 1. lYhen a locking mechanism 14 is released the bottom cover 13 can be turned clockl~ise about the shaft 13a clo-~nlardly to -the outside. This frees the platen 9 to be turned counter-clock~ise about thc main shaft 10 dol~nardly to , ..
~, ' .
the outside. Then, the label thread:ing mechanism D com-prised of a label starting member 80, a label holding member 81 and a label. holding ring 82, all of which are made coactive with the platen 9, is actuated to ensure the smooth threading of the label strip L. See, for instance, U. S. application Serial No. 837,193 filed September 28, 1977, corresponding to Canadian application 286,457 filed September 9, 1977.
Above the leading ~left hand) end portion of the platen 9, there is affixed a pair of label holding members 15a, which project from the inner walls of the labeler frames 1. Below the leading end portion of the platen 9, there is a carrier paper or backing strip holding member 15b, which is mounted on the upper side of the bottom cover 13 so as to hold the carrier paper I.b tha~ has been peeled from the label strip L. As a result, there is defined a reversing direction, thin passage for the label strip L
and the carrier paper Lb between the label holding members 15a and the platen 9 and then between the platen 9 and the carrier paper holding member 15b. In addition J the bottom cover 13 carries guide rollers 16 and 17 for directing the carri0r paper out the bottom of the labeler.
There is mounted rotatably on the shat 13a a label applying roller 18 which can apply individual lables ln a series of labels A to a commodity as they are separated from the carrier paper Lb when the carrier paper Lb direction of travel is reversed in the vicinity of the leading end of the platen 9.
.The trailing end of the label strip L is dispensed from a label supply ro]ler E which is ro~atably mounted on a roller holding bracket l9a that is located above the labeler frames 1. There is also located at this side of Fig. 1 a shorter roller holding bracket 19b which is juxtaposed to the longer bracket l9a so as to prevent the label strip L from being loosened or le~ off to this side while it is being unrolled.
ln operation, the label strip 1. is advanced in increments of one label length through the passage between the feed roller 11 and the label holding member 81 oE the label threading mechanism D onto the platen 9. Meanwhile, the label strip L is being drawn by the feecl roLler ll, WhiC}l is in~ermittently turned through a clrivc mechanism (not shown) in response to the releasing of the hand lever 3 after it has been manually squeezed. For this feeding purpose, the label strip L is formed with a series of engage-; 10 ment slits which are spaced apart a distance equal to the length of the labels La so that they may be engaged by the feed pawls 12 that are formed equidistantly apart upon the outer circumference of the feed roller 11. As a result, the ; label strip L can be aclvanced UpO]I the platen 9.
A constant pressure printing mechanism A
according ~o the present invention is now described. The constant pressure printlng mechanism A ensures that the labels La of the label strip L are printed under a constant printing pressure with the indicia on -the types 41a and ~lb of the printing heads 40a and 40b of the printing device B. As better seen in ~igs. 2 and 3, thc constant pressure printing mechanism A is princil~ally comprised of a prcssure applying assembly 20 and a pressure receiving assembly 26.
The pressure applying assembly 20 is positioned in the vicinity of the pivot pin 8 of the hand lever 3 and includes a pair of upright pressure cams 21, a cam shaft 25 and a torsion spring 25. The ~pressure cams 21 are correspondingly shaped, upstanding and spaced apart.
They are made of a synthetic resin having resiliency.
They are formed at their head portions with resiliently yieldable cam surfaces 21a. At the same forwardly facing side of their leg portions the cams have respective contact surfaces 21b. The leg portions of the pressure _9_ cams ~1 together define an aligned pair of shaft holes 23, in ~ihich the cam shaft 24 is inserted. The spring 25 is mounted on the shaft 24. Both ends of the cam shaft 24 are fixed to the side walls of the hand lever 3 by means o snap rings ~not sho~n). The torsion spring 25 has one end that is held on or abuts against a spring holding portion 22 of the pressure cam 21 and has its other end held likewise on a pressure receiving surface 3a of the hand lever 3. As a result, the pressure cams 21 are always biased to rotate clockwise about the cam shaft 24 until they assume their upright p~sitions, where their contact surfaces 21b abut against the pressure receiving surface 3a of the hand lever 3.
The pressure receiving assembly 26 is arranged close to the leg portions of the grips levers 2. The pressure receiving assembly 26 is comprised of a pair of down-~ardly directed pressure receiving cams 27, a pair of pressure receiving rollers 28, a cam shaft 32 and a torsion spring 33. The pressure receiving cams 27 may also be made of a synthetic resin having resiliency. The t-~o cams 27 are correspondingly shaped, upstanding and spaced apart, but closer together than cams 21. The cams 27 are each formed at their lo~er portions with a re-spective pair o~ shaft holes 29 and 31. The roller shaft 30 is fitted in the shaft holes 29 and it is fixed in the pressure receiving cams 27 by means of snap rings ~not shownl. The roller shaft 30 rotatably bears the paired pressure receiving rollers 28 at its both ends. The pair of pressure receiving rollers 28 are arranged outside of the pressure receiving cams 27 and are so placed and spaced that each roller 28 can be moved into abutment engagement with a respective cam surface 21a of a pressure cam 21. The cam shaft 32 is fitted in the other pair of aligned shaft holes 31. The cam shaft 32 is fixed to the grip levers 2 of the labeler frames 1 b~ means of snap rings (not shown).
The torsion spring 33 is mounte~ at the center portion of the cam shaft 32. The torsion spring 33 has one end that is held on or abu~s against the pressure receiving cams 27 and has its other end held on the pressure receiving surface 2a of the grip levers 2. As a result, the pressure receiving cams 27 are also always biased to rotate clock-~ise about the cam shaft 32 by the action of the torsion spring 33 until they assume their lo-~ered positions, where their pressure applying suraces 27a abut against the pressure receiving surface 2a of the grip levers 2.
The operation of the constant pressure printing mechanism A is now described. In the rest position, the hand lever 3 is manually squeezed toward the grip levers 2 against the biasing force of the return spring 7. This turns the printing levers 4 do-~ward, i.e. counter-clock~iise, about the pivot pin 8 to carry the printing heads 40a and 40b toward the platen 9 until the types 41a and 41b abut against the inking rollers 69a and 69b of different colors of an ink supply mechanism C, ~hich are described later in more detail. ~s a result, the dichroic inkillg rollers 69a and 69b are made to roll over the types 41a and 41b, respectively, while the inking rollers are regulated by a link mechanism and by roller guide means so that the inking rollers can supply the types t~ith tt~o colors or kinds of ink.
After the inking, ~hen the hand lever 3 is squeezed further, the pressure applying assembly 20, carried along by the hand lever 3, moves its cam surfaces 21a into abutment contact ~ith the pressure receiving rollers 28 of the pressure receiving assembly 26.
Further squeezing of the hand lever 3 lifts and turns the pressure receiving cams 27 of the pressure receiving assembly 26 counter-clock-~ise about the cam shat 32 against the biasing force of the torsion spring 33 so - that the pressure applying surface 27b formed on the top of the pressure receiving cams 27 is brought into abutment --ll--contact ~;tll the stationary press-lre receiving surface 2b of the grip levers 2. ~y this time, the contact surfaces 21b of the pressure cams 21 of the pressure applying assembly 20 are abutting against the pressure receiving surface 3a of the hand lever 3 and are applying the ma~imum pressllre ~.hich must be overcome to accomplish the printing.
en a greater squeezing force is applied to the hand lever 3, the cam surfaces 21a of the pressure cams 21 are forced against the pressure receiving rollers 28 until the resilient cams 21 are idented, which establishes a strain or stores compression energ~ hen the cam surfaces 21a of the cams 21 are adequately compressed or when the pressure receiving rollers 28 are enabled to ride over the cam surfaces 21a due to the resiliency of the surfaces 21a, the printing heads ~Oa and 40b are released from their retention by the contact bet~/een the pressure cams 21 and pressure receiving rollers 28. Of course, it could be the rollers 28 that are resiliently deformable and that are compressed and deformed, instead o~ the cam surfaces 21a, or even both of the rollers 28 and the surfaces could be deformable. Once the overriding occurs, as sho~n in double-dotted lines in ~ig. 2, the types ~la and ~lb are freed to move into abutment contact with the label then on t~e platell ~, t}-us effecting label printing.
After the printing operation, ~hen the hand lever 3 is released, the printing heads 40a alld 40b can be returned to their initial, rest positions by the action of the return spring 7. During the return motion of the constant pressure printing mechanism A, the pressure receiving assembly 2~ is biased clock-~ise under the influence of the torsion spring 33 so that the pressure cams 21 of the pressure applying assembly 20 are kept in contact ~ith the pressure receiving rollers 2S.
~lo-~ever, the pressure applying assembly 20 is able to pass the rollers 2S, by shifting slightly counter-cloc~ise '4~
so that the assembly 20 is allo~Yed to restore to its initial rest position without any special resistance by the biasing force of ~he torsion spring 25.
As will be apparent from the foregoing de-scription, with minimal modification to their conEig-urations, the positions of the pressure applying and pressure receiving assemblies coul~ be exchanged so that the pressure applying assembly would be on the grips 2 and the pressure receiving assembly would be on the hand lever.
The resistance applying ride-over means or printing pressure regulating means, comprised of the pressure applying assembly and the pressure rcceiving assembly, provides a number of advantages:
If the hand lever is squeezed with excessively strong force, the excessively high printing pressure is damped by the interaction bet~Yeen the pressure applying assembly and the pressure receiving assembly until the pressure is reduced to a preset constant printing pres-sure. If the hand lever is squeezed too ~Yeakly, the lotY
printing pressure is accumulated or awaited by the interaction bet~een the assemblies until the sque~zing force is increased to achieve the constant printing pressure. Thus~ it is possible to accomplish label printing at a constant pressure at all times and accordingly to ensure that the imprints on the labels have no irregularity and are highly accurate.
Since the pressure cams of the pressure applying assembly are made of a resilient, synthetic resin, the constant pressure printing mechanism can be quite durable, and thereby assure that the proper printing pressure Yill be applled ~or a longer time than a conventional mechanism, that uses the elasticity of a spring, t~ould permit.
3~
As a result, the constant pressure printing mechanism according ~o the present invention can exhibit prominent effects, especially when it is applied to a P.O.S. (i.e., Point-o-Sales~ system, in which the printed indicia are automatically read out by means of an optical character reader.
The in~ supply mechanism C according to another feature of the present invention operates in connection with the motions of the printing levers 4. As best seen in Fig. 4, the ink supply mechanism C is comprised of a pair of startillg rollers 50 that are carried on the leading ends of the printing levers 4, a pair of starting cams 51 that -form a portion of a link mechanism, a pair of link frames 56, an inking roller holder 61 holding the inking rollers 69a and 69b, each for providing ink of a respective color, a holder frame 59 providing connection betl~een inking roller holder 61 and the link mechanism, and roller guide means ~hich are pro~ided for at least one of the inking rollers 69a and 69b so that thcse rollers 69a and 69b can roll over their respective types 41a and 41b.
The pair of starting rollers 50 are rotatably mounted Oll the shat 50a ~hich is transversely supported in the supporting portions 50b e~tending from the leading ends of the printing levers 4. The paired cams 51 are engageable with the respective starting rollers 50. The cams 51 are attached to each other across thc transverse direction of the hand labeler by means of a connecting member (not shown). The cams 51 include recesses 52, in which the starting rollers 50 are to be received. The recesses 52 include lower inclined surfaces 53, which are shaped to allow the starting rollers 5Q to roll over them. The lower portions of the starting cams 51 are hingedly attached to the labeler frames 1 by means of a stationary pin 54. The upper portions of the cams 51 are hingedly attached to the lin~ frames 56 by means of a ~3~
movable pin 55. The paired link frames 56 have their upper portions pivotally conneoted to the movable pin 55 and their lower portions pivotally connected to the connecting pin 59a of ~he holder frame 59. The link frames 56 have a pair of curved slots 58 located in-~ermediate their length and within which a stationary pin 57 fixed to the labeler frames 1 is received.
The in~ing roller holder 61 is made of a synthetic resin ~hich is resilient and the holder 61 is supported by means of the connectin~ pin 59a of the holder frame 59 and by a connecting plate 59b. The holder 61 carries an inking roller engaging member 64 which is ixed to the supporting portion 62 of the holder 61 by a pin 63. The inking roller supporting member 67b of the second inking roller 69b is removably mounted on the engaging member 64. The secondary inking roller 69b is rotatably mounted on an inking roller shaft 68b ~hich is mounted in the supporting member 67b. The elastic, resilient receiving member 66 comprises a spring of a synthetic resin which can provide a roller squeezing pressure of constant level ~hen the inking roller 69b contacts the corresponding types ~lb. The elastic receiving rnember 66 extends from the supporting portion 62 of the holder 61 and its free eIid abuts against the bottom of the inking roller supporting member 67b.
At the trailing (right hand) end of the inking roller holder 61, an in~ing roller engaging member 65 is formed. The inking roller supporting member 67a of the primary inking roller 69a is removably engaged with the member 65. The inking roller 6~a is also made rotatable on its, shaft 68al which is mounted transversely in the supporting member 67a thereof.
The guide means for the first inking roller 69a includes a pair of engagement collars 60 mounted on both sides of the holder frame 59 and includes a pair of guide grooves 70 ormed in the inner :alls of the juxtaposed a~
labeler frames 1. The guide grooves 70 are sized and shaped so that the primary inking roller 69a only rolls on the types 41a of the first printing hcad 40a thereby to ink these types but *he roller 69a thereafter is moved do-~nward to prevent it from contacting the types 41b of the second printing head 40b. There are no guide grooves for the second inXing roller 69b, as the receiving member 66 urges it into position.
The inking rollers 69a and 69b are preferably inked such that the first roller 69a has a black color whereas the second roller 69b has a red color. The inking rollers 69a and 69b may alternatively have the inverse dichroic arrangement. Moreover, they may both be inked with one black color or with t-~o other colors, if desired, etc.
The operation of the ink supply mechanism C is now described in the following ~ith reference to Figs. 1 and 4. l~hen the hand lever 3 is squeezed to~ard the grip levers 2, the printng levers 4 carrying the printing heads 40a and 40b of the printing device B are turned do~n~ardly, i.e., counter-cloc]c~iise, about the pivot pin 8. As the printing levers 4 are mo~ed dol~n, the starting rollers 50 at the leading (left hand) end of the printing levers are carTied to $urn the starting cams 51 clockwise about the stationary pin 54. As a result, the link frames 56 which are hinged to the starting cams 51 by means of the movable pin 55 are turned clocXwise about the stationary pin 57 so that the holder ~rame 59 and the inking roller holder 61 are carried by the link frames 56 to the front of the body of the hand labeler The first inking roller 69a has its engagement collars 60 guided forl~ard by the guide grooves 70, and the second inking roller 69h is carried -forl~ard ~hile being supported by the elastic receiving member 66. Initially, the firs-t inking roller 69a rolls on the types 41a of the irst printing head 40a and thereby applies its black ink to the types 41a. After that, the first inking roller 69a is guided belol~ or apart from the types 41b of the second inking roller 40b. Meanwhile, the second inkin~ roller 69b i$ biased up-~ardly by the elas-tic receiving member 66 to roll over the types 41b of the second printing head 40b and thereby applies its red ink to the types 41b.
l~hen the hand lever 3 is squeezed further, the engagement collars 60 of the first inking roller 69a are abruptly dropped at the curved portions of the guide grooves 70 so that the inking roller 69a can pass around the second types 41b.
I~hen the starting rollers 50 are moved further dol~nward as the lever squeezing procceds, the rollers 50 are positioned on the inclined surfaces 53 of the starting cams 51, and this pressure engagement of the rollers 50 on the surfaces 53 causes the link frames 56 to have their curved slots 58 moved to the right or rear~ardly along the stationary pin 57 untll they assume their fallen positions, as sho~n in double-dotted lines in Fig.
4. ~s this motion proceeds, the holder frame 59 and the inking roller holder 61 assume their obliquely raised positions. As a result, the linear protrusion of the in~ing roller holder 61 to the front of the labeler body can be avoided to ensure excellent front vie~.
Immediately after the above described movement of the ink supply mechanism C, the constant pressure printing mechanism A is operated to abruptly bring the respeçtive printing heads 40a and 40b into abutment contact ~ith the platen 9 so that the label strip L can be imprinted under a preset constant pressure The return operation of the ink supply mechanism C is initiated by releasing the grip levers 2 and the hand lever 3. In response to the returning motion of the printing levers 4, the starting rollers 50 raise the starting cams Sl in the counter-clocks~ise direction so that the ink supply mechanism C is restored to its initial rest position. Since the starting rollers 50 are ~3~
he:ld during the printing operation in contact with the recesses 52 of the starting cams 51, the inking roller holder 61 which carries the inking rollers 69a and 69b is also returned in accordance ~ith the movement of the starting rollers 50.
The in~ supply mechanism of the ~resent invention can also produce a number of advantages:
Si.nce the starting means, that starts the in~ing motion of the inking rollers of the ink supply mechanism, includes starting rollers carried at the leading ends of the printing levers and that are held to engage with the recesses of starting cams which are coactive ~ith the link frames and the inking roller holder, the starting means may be free from any slippage or lost motion during the starting operation.
. The two inking rollers impregnated with ink o different colors are arranged and guided such that the first roller, l~hich is positioned at the trailing side, is guided or regulated by guide grooves formed in the labeler ~rames, whereas the second roller, W]liC]l is positioned at the leading side, is set free from the regulations o:E the guide grooves to follo~ a diferent locus. As a result, the inkillg rollers can ensure their respective inking operations in an accurate manner while only inking thei~ corresponding types.
- In the moving means for the inking rollers, since the starting cams and the lin~ frames are connected by means of the movable pin and since the iink frames themselves are formed ~ith curved slots, the l~hole ink supply mechanism can be prevented from linearly protruding to the front of the labeler body, and can instead assume a retracted position. As a result, a ~ide field of vie--in front of the labeler body is assured during the label applying operation so that the label applying can be accomplis~led ~ith clear observation of the label being applied.
~3~
Although -the foregoing description has been : directed to the embodiments in which the constant pressure printing mechanism and the ink supply mechanism are applied to a hand labeler, it should be understood that the present invention can be extended to modifications, in which the both mechanisms arc used with a similar printing mechanism such as a hand operated tagging machine or a desk type automatic label printing machine.
; Although the present invention has been described in connection with the preferred embodiments thereof, many j variations and modifications will now become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific dis-closure herein, but only by the appended claims.
Immediately after the above described movement of the ink supply mechanism C, the constant pressure printing mechanism A is operated to abruptly bring the respeçtive printing heads 40a and 40b into abutment contact ~ith the platen 9 so that the label strip L can be imprinted under a preset constant pressure The return operation of the ink supply mechanism C is initiated by releasing the grip levers 2 and the hand lever 3. In response to the returning motion of the printing levers 4, the starting rollers 50 raise the starting cams Sl in the counter-clocks~ise direction so that the ink supply mechanism C is restored to its initial rest position. Since the starting rollers 50 are ~3~
he:ld during the printing operation in contact with the recesses 52 of the starting cams 51, the inking roller holder 61 which carries the inking rollers 69a and 69b is also returned in accordance ~ith the movement of the starting rollers 50.
The in~ supply mechanism of the ~resent invention can also produce a number of advantages:
Si.nce the starting means, that starts the in~ing motion of the inking rollers of the ink supply mechanism, includes starting rollers carried at the leading ends of the printing levers and that are held to engage with the recesses of starting cams which are coactive ~ith the link frames and the inking roller holder, the starting means may be free from any slippage or lost motion during the starting operation.
. The two inking rollers impregnated with ink o different colors are arranged and guided such that the first roller, l~hich is positioned at the trailing side, is guided or regulated by guide grooves formed in the labeler ~rames, whereas the second roller, W]liC]l is positioned at the leading side, is set free from the regulations o:E the guide grooves to follo~ a diferent locus. As a result, the inkillg rollers can ensure their respective inking operations in an accurate manner while only inking thei~ corresponding types.
- In the moving means for the inking rollers, since the starting cams and the lin~ frames are connected by means of the movable pin and since the iink frames themselves are formed ~ith curved slots, the l~hole ink supply mechanism can be prevented from linearly protruding to the front of the labeler body, and can instead assume a retracted position. As a result, a ~ide field of vie--in front of the labeler body is assured during the label applying operation so that the label applying can be accomplis~led ~ith clear observation of the label being applied.
~3~
Although -the foregoing description has been : directed to the embodiments in which the constant pressure printing mechanism and the ink supply mechanism are applied to a hand labeler, it should be understood that the present invention can be extended to modifications, in which the both mechanisms arc used with a similar printing mechanism such as a hand operated tagging machine or a desk type automatic label printing machine.
; Although the present invention has been described in connection with the preferred embodiments thereof, many j variations and modifications will now become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific dis-closure herein, but only by the appended claims.
Claims (13)
1. A label printing machine, comprising:
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting cam, in turn, moves said turning means; said starting cam including a recess; a starting element on said printing lever and pro-jecting into said starting cam recess, said starting element being in engagement with said starting cam for causing pivot-ing of said starting cam, and said starting cam recess being shaped to permit relative shifting of said starting element with respect to said starting cam as a result of their pivot-ing about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved by said turning means and said inking roller holder.
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting cam, in turn, moves said turning means; said starting cam including a recess; a starting element on said printing lever and pro-jecting into said starting cam recess, said starting element being in engagement with said starting cam for causing pivot-ing of said starting cam, and said starting cam recess being shaped to permit relative shifting of said starting element with respect to said starting cam as a result of their pivot-ing about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved by said turning means and said inking roller holder.
2. A label printing machine, comprising:
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting cam, in turn, moves said turning means;
a starting element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shifting of said starting element with re-spect to said starting cam as a result of their pivoting about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved by said turning means and said inking roller holder;
said guide means includes a guide groove in said machine frame for guiding one of said inking rollers to regulate the path travelled by said one inking roller and for said one inking roller to move past first respective said types;
said guide means further comprising an elastic member for supporting the other of said inking rollers into abutment contact with a second respective said type of said printing device as said turning means moves said other inking roller over said second type.
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting cam, in turn, moves said turning means;
a starting element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shifting of said starting element with re-spect to said starting cam as a result of their pivoting about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved by said turning means and said inking roller holder;
said guide means includes a guide groove in said machine frame for guiding one of said inking rollers to regulate the path travelled by said one inking roller and for said one inking roller to move past first respective said types;
said guide means further comprising an elastic member for supporting the other of said inking rollers into abutment contact with a second respective said type of said printing device as said turning means moves said other inking roller over said second type.
3. A label printing machine, comprising:
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting means, in turn, moves said turning means;
a starting element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shifting of said starting element with re-spect to said starting cam as a result of their pivoting about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved;
said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivot-ally engaging said link intermediate said other pivot con-nections of said link;
whereby pivoting of said cam, with said starting means, toward said platen pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operative position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing device moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding two separated inking rollers;
turning means connected with said inking roller holder for moving said inking rollers over said types;
a starting cam which is pivotally connected to said machine frame at a different pivot than said operating lever, said starting cam also being pivotally connected to said turning means such that movement of said starting means, in turn, moves said turning means;
a starting element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shifting of said starting element with re-spect to said starting cam as a result of their pivoting about different respective pivots;
guide means supported in said frame for guiding said inking rollers along different respective paths and over respective said types as said inking rollers are moved;
said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivot-ally engaging said link intermediate said other pivot con-nections of said link;
whereby pivoting of said cam, with said starting means, toward said platen pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
4. The label printing machine of claim 3, further comprising an elongated slot in said link, at which said link pivot engages said link, and said slot being elongated in a direction such that when said pivot lever has moved to said printing position, said link may slide along said slot back toward said types, for reducing protrusion of said link.
5. The label printing machine of claim 1, wherein said printing lever is integral with said operating lever and moves therewith, and motion of said printing lever and of said starting element is, therefore, toward said platen as said printing lever moves toward said printing position.
6. The label printing machine of claim 1, wherein said starting element comprises a roller received in said recess.
7. The label printing machine of claim 2, further comprising label feeding means for feeding a label to said platen for being printed.
8. The label printing machine of claim 1, wherein said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said plate pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said plate pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
9. The label printing machine of claim 8, further comprising an elongated slot in said link, at which said link pivot engages said link, and said slot being elongated in a direction such that when said pivot lever has moved to said printing position, said link may slide along said slot back toward said types, for reducing protrusion of said link.
10. A label printing machine, comprising:
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operating position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing devices moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding an inking roller;
starting means connected with said printing lever for moving as said printing lever moves toward said platen;
guide means supported in said frame for guiding said inking roller over said types as said inking roller is moved;
turning means connected with said inking roller holder for moving said inking roller over said types as guided by said guide means; said starting means being also connected with said turning means such that movement of said starting means, in turn, moves said turning means;
said starting means includes a starting cam which is pivotally connected to said machine frame and to said turning means; said starting means further comprises a start-ing element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shift-ing of said starting element with respect to said starting cam as a result of their pivoting about different respective pivots;
said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said platen pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking roller over said types.
a machine frame;
an operating lever pivotally connected to said machine frame and movable from a rest position toward an operative position;
a printing lever connected with said operating lever for moving between a respective rest position when said operating lever is in said rest position and a printing position as said operating lever moves to said operating position;
a printing device, including inkable imprinting types carried on said printing lever;
a platen connected to said machine frame and in opposition to said types as said printing devices moves to said printing position, whereby said types will engage a label on said platen when said printing lever is in said printing position;
an ink supply device for inking said types, comprising:
an inking roller holder for holding an inking roller;
starting means connected with said printing lever for moving as said printing lever moves toward said platen;
guide means supported in said frame for guiding said inking roller over said types as said inking roller is moved;
turning means connected with said inking roller holder for moving said inking roller over said types as guided by said guide means; said starting means being also connected with said turning means such that movement of said starting means, in turn, moves said turning means;
said starting means includes a starting cam which is pivotally connected to said machine frame and to said turning means; said starting means further comprises a start-ing element on said printing lever and in engagement with said starting cam for causing pivoting of said starting cam and said starting cam being shaped to permit relative shift-ing of said starting element with respect to said starting cam as a result of their pivoting about different respective pivots;
said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said platen pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking roller over said types.
11. The label printing machine of claim 10, fur-ther comprising an elongated slot in said link, at which said link pivot engages said link, and said slot being elongated in a direction such that when said pivot lever has moved to said printing position, said link may slide along said slot, back toward said types, for reducing pro-trusion of said link.
12. The label printing machine of claim 2, wherein said turning means further comprises:
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said plate pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
a link pivotally connected to said starting cam, on the one hand, and at a spaced apart location on said link, pivotally connected to said inking roller holder, on the other hand; a link pivot on said machine frame pivotally engaging said link intermediate said other pivot connections of said link;
whereby pivoting of said cam, with said starting means, toward said plate pivots said link around said link pivot, which, in turn, moves said inking roller holder to move said inking rollers over the respective said types.
13. The label printing machine of claim 12, further comprising an elongated slot in said link, at which said link pivot engages said link, and said slot being elongated in a direction such that when said pivot lever has moved to said printing position, said link may slide along said slot back toward said types, for reducing protrusion of said link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000387332A CA1139985A (en) | 1978-04-24 | 1981-10-05 | Hand operated label printing machine |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53047804A JPS5953185B2 (en) | 1978-04-24 | 1978-04-24 | Appropriate pressure printing mechanism for hand labelers, etc. |
| JP53-47804 | 1978-04-24 | ||
| CA000326076A CA1120324A (en) | 1978-04-24 | 1979-04-23 | Hand operated label printing machine |
| CA000387332A CA1139985A (en) | 1978-04-24 | 1981-10-05 | Hand operated label printing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1139985A true CA1139985A (en) | 1983-01-25 |
Family
ID=27166199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000387332A Expired CA1139985A (en) | 1978-04-24 | 1981-10-05 | Hand operated label printing machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1139985A (en) |
-
1981
- 1981-10-05 CA CA000387332A patent/CA1139985A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |