CA1075948A - Photocomposing font clip with flexible v-shaped end portions - Google Patents
Photocomposing font clip with flexible v-shaped end portionsInfo
- Publication number
- CA1075948A CA1075948A CA296,886A CA296886A CA1075948A CA 1075948 A CA1075948 A CA 1075948A CA 296886 A CA296886 A CA 296886A CA 1075948 A CA1075948 A CA 1075948A
- Authority
- CA
- Canada
- Prior art keywords
- font
- clip
- drum
- pair
- clips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41B—MACHINES OR ACCESSORIES FOR MAKING, SETTING, OR DISTRIBUTING TYPE; TYPE; PHOTOGRAPHIC OR PHOTOELECTRIC COMPOSING DEVICES
- B41B17/00—Photographic composing machines having fixed or movable character carriers and without means for composing lines prior to photography
- B41B17/18—Details
- B41B17/20—Character carriers; Cleaning devices therefor
- B41B17/24—Character carriers; Cleaning devices therefor with all characters
- B41B17/34—Character carriers; Cleaning devices therefor with all characters on a cylinder
Landscapes
- Clamps And Clips (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to and discloses a novel retaining means adapted to releasably secure a font to a rotatable character drum. The retaining means comprises a first clip and a second clip, each clip being adapted to be secured to a respective side edge of the font. The first clip has flattened peripheral end portions which engage hooks on the drum and the second clip has flexible V-shaped end portions which interact with protrusions on the drum face, thereby releasably securing the font to a drum. These clips have improved resiliency when compared to the clips of the prior art and securely hold the font to the drum thus overcoming the problem of the prior art clips being "thrown" off the drum. The clips have sufficient tensile strength to seat the font correctly yet rigidly on the drum.
This invention relates to and discloses a novel retaining means adapted to releasably secure a font to a rotatable character drum. The retaining means comprises a first clip and a second clip, each clip being adapted to be secured to a respective side edge of the font. The first clip has flattened peripheral end portions which engage hooks on the drum and the second clip has flexible V-shaped end portions which interact with protrusions on the drum face, thereby releasably securing the font to a drum. These clips have improved resiliency when compared to the clips of the prior art and securely hold the font to the drum thus overcoming the problem of the prior art clips being "thrown" off the drum. The clips have sufficient tensile strength to seat the font correctly yet rigidly on the drum.
Description
,----BACKGROUND OF THE INVENTION
___________________________ 1. FIELD OF THE INVENTION
_ _ .
This invention relates generally to the photocomposing industry and more particularly, to font clips adapted to releasably secure a font to a drum of a photocomposing machine.
:
___________________________ 1. FIELD OF THE INVENTION
_ _ .
This invention relates generally to the photocomposing industry and more particularly, to font clips adapted to releasably secure a font to a drum of a photocomposing machine.
:
2. DESCRIPTION OF THE PRIOR ART
Photocomposing machines are well known in the prior art and include various different configurations. These have included machines which utilize font plates in the form of spinning discs, plates using rectangular columns and rows ; and different systems have been provided which either move the font plate or alternatively, transpose the image from the font to the desired position.
More recently, the photocomposing machines which have been used are as shown in United States patent number 3,738,236 granted to Grube et al on June 12, 1973.
These machines include a moveable character drum and 20 an optical system which focuses a preselected character from a font or font element unto a roll of sensitized material.
A flexible font has a series of characters (which may include numerals, letters or other symbols) arranged on its face and a retaining means which is secured to the font and which is adapted to interact with means carried on the drum to secure the font to the character drum. The means carried by the drum which interacts with the retaining means on the font comprises, in one embodiment, a pair of hooks extending from the drum which hook unto one side of the retaining means on the font and a pair of vertically aligned protrusions which are displaced around :
. , ., :
1 the drum from the pair of hooks approximately the same aistance as the length of the font.
In another embodiment, the pair of protrusions may be displaced from the pair of hooks and, with this embodiment, project through the font to be contacted by the retaining means which is carried on the font in a coxresponding position. The font itself may extend beyond the means on the drum if desired.
Various means have been tried to releasably secure the font to the drum. As shown in Grube et al, a pair of retaining means are secured to the opposite peripheral widths of the font. One retaining means is a flat, rectangular bar about which the pair of hooks from the drum are secured through corresponding apertures in the font.
On the opposite side of the font, a second but shorter rectangular bar is provided with spring means extending from each end of the bar. Two small protrusions protrude from the drum through apertures in the font and the spring means, by friction, holds the font to the drum.
Unfortunately, these clips have drawbacks which make them unsuitable for long and continuous use. Prior to the present invention, it was impossible to obtain clips which held the font to the drum without fatigue and yet, were inexpensive to manufacture and easy to use.
The particular drawbacks of the devices of the prior art include the problem of insufficient resiliency during use. On many occasions, because of this lack of resiliency, the clips would rip the rivets right through the font. Wire fatigue has always been a problem. A further problem is that the drum rotates very quickly with back and forth rotations and unless the font is secured properly, the font ~a~ pop off the face of the drum. If this occurs, the font is usually ;' :
' . .:
1 destroyed and other fonts on the drum may be damaged or ; destroyed. The machine must then be stopped and disassembled and a new font or fonts placed on the drum. This stoppage reduces the amount of time the machine is operational thus reducing the efficiency of the system.
SUMMARY OF THE INVENTION
__~_____________________ Accordingly, the present invention provides novel retaining means adapted to releasably secure a font to a rotatable character drum. 'l'he means comprises a first clip and a second clip, which, in combination with the securing means on the drum itself, holds the font in correct alignment on the face of the drum with sufficient tensile strength to seat the font correctly yet rigidly on the drum.
To this end, in one of its aspects, the invention provides retaining means adapted to releasably secure a font to a rotatable character drum, said retaining means comprising a first clip and a second clip, each clip adapted to be secured ` to a respective side edge of said font, said first clip having flattened peripheral end portions, and said second clip having flexible V-shaped end portions, said end portions of said first and second clips being adapted to releasably secure said font to said drum.
In another of its aspects, the invention further provides a retainer means for use with a font in a photocomposing machine having a rotatable drum, said font having a plurality of characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a pair of hooks adapted to project through a first pair of - : . . :
., .
1 corresponding apertures in said font and a pair of protrusions : . adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned near one width edge of said font and said second pair of apertures positioned near the opposite width edge of said font, retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first clip secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
In further of its aspects, the invention provides a photocomposing machine which includes a rotatable drum, a . font having characters thereon and releasably secured to said drum, means for projecting the characters on said font to a recording medium, said font having a plurality of - characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a : pair of hooks adapted-to project through a first pair of corresponding apertures in said font and a pair of protrusions adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned `!! near one width.edge of said font and said second pair of apertures positioned near the opposite width edge of said font, retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first ~'''' . .
. -4-' , 1075!~48 1 clip secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
BRIEF DESCRIPTION OF THE DRAWINGS
_________________________________ FIGURE 1 is a front view of said font clips.
FIGURE 2 is a perspective view of said font clips.
FIGURE 3 is a front view of said clips secured to said font.
FIGURE 4 is a perspective view of said font and clips secured to a drum.
FIGURE 5 is a top end view showing the engagement between the protrusions and the second clip when the font and clips are secured to the drum.
FIGURE 6 is a top view showing one end of the second clip in engagement with the protrusions on the drum.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The font clips of the present invention provide notable improvements over the prior art and they combine basic simplicit~
- 20 with modern technology and materials. In particular, these clips have the ability to overcome the diverse differences in the manu-facturer's tolerances of the retaining points on the actual charac-ter drum. Sufficient tensile strength is provided to seat the font correctly while maintaining sufficient rigidity on the drum.
The clips are easily mounted and removed and are made of a material of sufficient durability to overcome a primary fault in the prior art clips; that is, the steel spring or resilient means was prone to lose its tensile strength thus reducing its retention capabilities.
The locking means incorporated into the present de~ice overcomes any variances in the horizontal and vertical locating points on the drum and the clips are sufficiently light so as not to cause a weight imbalance when the fonts are mounted.
_5_ .
.
, 1 Referring now to figure 1 of the appended drawings, there i5 shown a pair of font clips of the present invention (shown in perspective view in figure 2).
The retaining means (or clips) of the present invention comprises a first clip 10 and a second clip 12. The first clip 10 includes an elongated, substantially rectangular base 14 and an elevated central portion 16. Base 14 has a pair of flat, peripheral portions 18, 20, one flat portion at each end, the purpose of which will be explained hereinafter.
Elevated central portion 16 of the clip 10 is shown ~-with a central recessed portion 22. This recessed portion is not an essential element of the invention but in the preferred embodiment, has been introduced to reduce the weight of the clip 10 and the material required for its production. Rivet holes 24, 26-are provided to secure the clip to the font. ~Any means may be used to secure the font clips to the font but it has beèn found that rivetting provides a secure, quick and inexpensive method to accomplish this.
In the figures, the clip 10 is shown as having indented portions 28, 30. These indentions are provided to reduce the weight of the clip and the material required to manufacture it. These indentions may be omitted without deviating from the scope of the present invention.
The second clip 12 comprises an elongated body of approximately the same length as the first clip 10 and of approximately the same height as the central portion of the clip 10. Clip 12 may be of marginally greater length than clip 10 if desired.
Each end of clip 12 comprises a V-shaped portion 32, 34 with the base of the "V" directed inwardly and normal to the longitudinal axis of the clip 12 and a thin, peripheral . .
-, .
- ~ ' 10759~8 1 end 36, 38 colinear with the longitudinal axis of the clip 12.
A central, recessed portion 40 is also provided which, like recessed portion 22 in clip 10, reduces the weight of the clip. Rivet holes 42, 44 are also provided to secure the clip to the font as will be explained hereinafter.
Referring now to figure 3, there is shown a film font 46 with clips 10 and 12 secured thereto. Font 46 is a photo-graphic negative with a series of characters (which may include numerals, letters or other symbols) arranged in a predetermined order and position. The font usually has an opaque background with transparent characters thereon and may be of any desired and well-known series of characters.
The font 46 carries a series of apertures on its surface which aid in securing it to the drum and aligning it in the desired position.
On each side of the font, there are disposed a pair of apertures 48, 50 and 52, 54 which are used in conjunction with the clips 10, 12 to secure the font to the drum. Other - apertures 56 may be found on the face of the font to align it in the desired position on the drum.
The clips may be secured to the font by any well-known means. An example of this means is the use of rivets which are secured through rivet holes 42, 44 in clip 12 and holes 24, 26 in clip 10 thereby securing the clips to the font in the desired position.
Referring now to figure 4, there is shown the font - 46 (with clips attached) mounted on a drum 58. In order to mount the font 46 on the drum 58, hooks 60, 62 are provided on the drum which correspond to apertures 52, 54. The hooks are placed through the apertures and over the flat end portions 18, 20 of the clip 10.
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~75948 ....
The position of the font is then adjusted until the alignment apertures 56 are secured to the Various alignment protrusions on the face of the drum.
The opposite end of the font 46 is then secured to the drum. Protrusions 64, 66 are provided which extend through apertures 48, 50 in the font and the position of the protrusions is such that the inner surfaces of the ends 36, 38 of clip 12 are forced marginally outwardly and are held in tension in contact with the protrusions 64, 66. The particular design and shape of the clip 12 provides the necessary resiliency for ends 36, 38 to flex outwardly and secure that end of the font 46 in contact with the protrusions 64, 66.
Thus, the font is releasably secured to the surface of the drum in a quick and efficient manner.
The clips of the present invention may be manufactured of any material which is lightweight and durable, and provides the necessary resiliency and flexibility. The present inventors - have found that acetal polymer fulfills these requirements and has proven guite inexpensive.
Acetal polymer is a crystalline polymer based on ~.
trioxane and offers an excellent balance of predictable engineering properties. It is strong, stiff, tough and of - sufficient hardness to be particularly suitable for the present application; either as the homopolymer or as a copolymer. The natural copolymer is translucent to opaque and may be coloured at very low costs.
The clips of acetal polymer may be manufactured by using standard types of injection molding equipment and the melt temperature may vary from 360 to 450F with no sacrifice in part strength. After forming, the clips can be finished 1 by a variety of finishing operations including annealing, adhesion and fastening, machining and decorating, if desired.
Clips manufactured of acetal polymer possess high strength and rigidity, excellent frictional properties and outstanding resistance to fatigue. Thus, one of the serious drawbacks of the clips of the prior art, namely, fatigue, has been successfully overcome. Also, the clips of the present invention show excellent tensile and flexural properties, making them particularly suitable for the present applicat~on.
With the clips of the prior art, one of the problems which has not been overcome is that the clips will release from the drum during usage. As noted hereinbefore, the drum 58 rotates at a great rate of speed thereby tending to "throw off"
the font from the face of the drum. The applicant has found that the clips 10 and 12 of the present invention securely hold the font to the drum and do not suffer from fatigue during use.
For an explanation of how the clips hold the font to ~- the drum, reference is now made to Figures 5 and 6 of the drawings. To secure the font to the drum, one end of the font is placed on the drum so that the hooks 60 and 62 may be inserted through apertures 52, 54 and over the flat end portions 18, 20 : of the clip 10. The Eosition of the font is then adjusted until the alignment apertures 56 are secured to the alignment protrusions on the face of the drum as explained hereinbefore.
Protrusions 64 are usually in the form of balls and interact with the inner surfaces 37, 39 of the ends 36, 38 of the clips 12. As shown in Figure 5, surface 39 has, in the preferred embodiment, a slope of about 30 whereas the opposite surface 43 may have a slope of about 2. (The slope of surface 39 is not restricted to an angle of 30 but may have any slope greater than 50).
~9_ ~075948 1 tSurfaces 37, 39 and 41, 43 are identical although at opposite ends of the clip 12). When the font is to be placed on the drum, the end 38 of clip 12 is distorted manually from the position shown in dotted lines to the position indicated in solid lines in Figure 5. When released, the clip assumes the position shown in the l'chain-dot" line providing contact at the point 35 with the protrusion 64.
If the pro~rusions 64 were not present, the clip, because of its resilient character, would assume its normal position shown in dotted lines. This is shown in top view of Figure 6 of the drawings. Contact point 35 occurs on the sloping ; surface 39 of the end 38 of the clip 12.
It is thought that the sloping surface on one end of the clip, in conjunction with the ball or protrusion, creates a downward and inward pressure which forces the clip towards the base of the ball thereby tending to hold the clip in contact with the ball when the drum is rotated.
The V-shaped portions 32, 34 on the clip 12 provide resiliency to the clip and distribute the bending or distorting 20 force applied to the clip when placed on the protrusions, over the entire length of the body to prevent any overstressing of the body. Contrary to the devices of the prior art, the clip is hèld securely to the protrusion during rotation of the drum, which in fact, causes the clip to be held more securely to the drum rather than tending to throw the clip off the drum as experienced with the prior art devices.
The clips themselves do not extend the full height of - the font. As shown in Figure 3, one end of the clips is aligned with an edge ~of the font but the opposite end of the clips terminates at the edge of the alignment apertures 56. Thus, the -lQ-~0759~8 1 clips do not interfere with timing marks 68 on the font 46.
Although the disclosure describes and illustrates a preferred embodiment of the invention, it is to be understood the invention is not restricted to this particular embodiment.
~ '' ' ' .
.
- . -11- .
Photocomposing machines are well known in the prior art and include various different configurations. These have included machines which utilize font plates in the form of spinning discs, plates using rectangular columns and rows ; and different systems have been provided which either move the font plate or alternatively, transpose the image from the font to the desired position.
More recently, the photocomposing machines which have been used are as shown in United States patent number 3,738,236 granted to Grube et al on June 12, 1973.
These machines include a moveable character drum and 20 an optical system which focuses a preselected character from a font or font element unto a roll of sensitized material.
A flexible font has a series of characters (which may include numerals, letters or other symbols) arranged on its face and a retaining means which is secured to the font and which is adapted to interact with means carried on the drum to secure the font to the character drum. The means carried by the drum which interacts with the retaining means on the font comprises, in one embodiment, a pair of hooks extending from the drum which hook unto one side of the retaining means on the font and a pair of vertically aligned protrusions which are displaced around :
. , ., :
1 the drum from the pair of hooks approximately the same aistance as the length of the font.
In another embodiment, the pair of protrusions may be displaced from the pair of hooks and, with this embodiment, project through the font to be contacted by the retaining means which is carried on the font in a coxresponding position. The font itself may extend beyond the means on the drum if desired.
Various means have been tried to releasably secure the font to the drum. As shown in Grube et al, a pair of retaining means are secured to the opposite peripheral widths of the font. One retaining means is a flat, rectangular bar about which the pair of hooks from the drum are secured through corresponding apertures in the font.
On the opposite side of the font, a second but shorter rectangular bar is provided with spring means extending from each end of the bar. Two small protrusions protrude from the drum through apertures in the font and the spring means, by friction, holds the font to the drum.
Unfortunately, these clips have drawbacks which make them unsuitable for long and continuous use. Prior to the present invention, it was impossible to obtain clips which held the font to the drum without fatigue and yet, were inexpensive to manufacture and easy to use.
The particular drawbacks of the devices of the prior art include the problem of insufficient resiliency during use. On many occasions, because of this lack of resiliency, the clips would rip the rivets right through the font. Wire fatigue has always been a problem. A further problem is that the drum rotates very quickly with back and forth rotations and unless the font is secured properly, the font ~a~ pop off the face of the drum. If this occurs, the font is usually ;' :
' . .:
1 destroyed and other fonts on the drum may be damaged or ; destroyed. The machine must then be stopped and disassembled and a new font or fonts placed on the drum. This stoppage reduces the amount of time the machine is operational thus reducing the efficiency of the system.
SUMMARY OF THE INVENTION
__~_____________________ Accordingly, the present invention provides novel retaining means adapted to releasably secure a font to a rotatable character drum. 'l'he means comprises a first clip and a second clip, which, in combination with the securing means on the drum itself, holds the font in correct alignment on the face of the drum with sufficient tensile strength to seat the font correctly yet rigidly on the drum.
To this end, in one of its aspects, the invention provides retaining means adapted to releasably secure a font to a rotatable character drum, said retaining means comprising a first clip and a second clip, each clip adapted to be secured ` to a respective side edge of said font, said first clip having flattened peripheral end portions, and said second clip having flexible V-shaped end portions, said end portions of said first and second clips being adapted to releasably secure said font to said drum.
In another of its aspects, the invention further provides a retainer means for use with a font in a photocomposing machine having a rotatable drum, said font having a plurality of characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a pair of hooks adapted to project through a first pair of - : . . :
., .
1 corresponding apertures in said font and a pair of protrusions : . adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned near one width edge of said font and said second pair of apertures positioned near the opposite width edge of said font, retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first clip secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
In further of its aspects, the invention provides a photocomposing machine which includes a rotatable drum, a . font having characters thereon and releasably secured to said drum, means for projecting the characters on said font to a recording medium, said font having a plurality of - characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a : pair of hooks adapted-to project through a first pair of corresponding apertures in said font and a pair of protrusions adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned `!! near one width.edge of said font and said second pair of apertures positioned near the opposite width edge of said font, retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first ~'''' . .
. -4-' , 1075!~48 1 clip secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
BRIEF DESCRIPTION OF THE DRAWINGS
_________________________________ FIGURE 1 is a front view of said font clips.
FIGURE 2 is a perspective view of said font clips.
FIGURE 3 is a front view of said clips secured to said font.
FIGURE 4 is a perspective view of said font and clips secured to a drum.
FIGURE 5 is a top end view showing the engagement between the protrusions and the second clip when the font and clips are secured to the drum.
FIGURE 6 is a top view showing one end of the second clip in engagement with the protrusions on the drum.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The font clips of the present invention provide notable improvements over the prior art and they combine basic simplicit~
- 20 with modern technology and materials. In particular, these clips have the ability to overcome the diverse differences in the manu-facturer's tolerances of the retaining points on the actual charac-ter drum. Sufficient tensile strength is provided to seat the font correctly while maintaining sufficient rigidity on the drum.
The clips are easily mounted and removed and are made of a material of sufficient durability to overcome a primary fault in the prior art clips; that is, the steel spring or resilient means was prone to lose its tensile strength thus reducing its retention capabilities.
The locking means incorporated into the present de~ice overcomes any variances in the horizontal and vertical locating points on the drum and the clips are sufficiently light so as not to cause a weight imbalance when the fonts are mounted.
_5_ .
.
, 1 Referring now to figure 1 of the appended drawings, there i5 shown a pair of font clips of the present invention (shown in perspective view in figure 2).
The retaining means (or clips) of the present invention comprises a first clip 10 and a second clip 12. The first clip 10 includes an elongated, substantially rectangular base 14 and an elevated central portion 16. Base 14 has a pair of flat, peripheral portions 18, 20, one flat portion at each end, the purpose of which will be explained hereinafter.
Elevated central portion 16 of the clip 10 is shown ~-with a central recessed portion 22. This recessed portion is not an essential element of the invention but in the preferred embodiment, has been introduced to reduce the weight of the clip 10 and the material required for its production. Rivet holes 24, 26-are provided to secure the clip to the font. ~Any means may be used to secure the font clips to the font but it has beèn found that rivetting provides a secure, quick and inexpensive method to accomplish this.
In the figures, the clip 10 is shown as having indented portions 28, 30. These indentions are provided to reduce the weight of the clip and the material required to manufacture it. These indentions may be omitted without deviating from the scope of the present invention.
The second clip 12 comprises an elongated body of approximately the same length as the first clip 10 and of approximately the same height as the central portion of the clip 10. Clip 12 may be of marginally greater length than clip 10 if desired.
Each end of clip 12 comprises a V-shaped portion 32, 34 with the base of the "V" directed inwardly and normal to the longitudinal axis of the clip 12 and a thin, peripheral . .
-, .
- ~ ' 10759~8 1 end 36, 38 colinear with the longitudinal axis of the clip 12.
A central, recessed portion 40 is also provided which, like recessed portion 22 in clip 10, reduces the weight of the clip. Rivet holes 42, 44 are also provided to secure the clip to the font as will be explained hereinafter.
Referring now to figure 3, there is shown a film font 46 with clips 10 and 12 secured thereto. Font 46 is a photo-graphic negative with a series of characters (which may include numerals, letters or other symbols) arranged in a predetermined order and position. The font usually has an opaque background with transparent characters thereon and may be of any desired and well-known series of characters.
The font 46 carries a series of apertures on its surface which aid in securing it to the drum and aligning it in the desired position.
On each side of the font, there are disposed a pair of apertures 48, 50 and 52, 54 which are used in conjunction with the clips 10, 12 to secure the font to the drum. Other - apertures 56 may be found on the face of the font to align it in the desired position on the drum.
The clips may be secured to the font by any well-known means. An example of this means is the use of rivets which are secured through rivet holes 42, 44 in clip 12 and holes 24, 26 in clip 10 thereby securing the clips to the font in the desired position.
Referring now to figure 4, there is shown the font - 46 (with clips attached) mounted on a drum 58. In order to mount the font 46 on the drum 58, hooks 60, 62 are provided on the drum which correspond to apertures 52, 54. The hooks are placed through the apertures and over the flat end portions 18, 20 of the clip 10.
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~75948 ....
The position of the font is then adjusted until the alignment apertures 56 are secured to the Various alignment protrusions on the face of the drum.
The opposite end of the font 46 is then secured to the drum. Protrusions 64, 66 are provided which extend through apertures 48, 50 in the font and the position of the protrusions is such that the inner surfaces of the ends 36, 38 of clip 12 are forced marginally outwardly and are held in tension in contact with the protrusions 64, 66. The particular design and shape of the clip 12 provides the necessary resiliency for ends 36, 38 to flex outwardly and secure that end of the font 46 in contact with the protrusions 64, 66.
Thus, the font is releasably secured to the surface of the drum in a quick and efficient manner.
The clips of the present invention may be manufactured of any material which is lightweight and durable, and provides the necessary resiliency and flexibility. The present inventors - have found that acetal polymer fulfills these requirements and has proven guite inexpensive.
Acetal polymer is a crystalline polymer based on ~.
trioxane and offers an excellent balance of predictable engineering properties. It is strong, stiff, tough and of - sufficient hardness to be particularly suitable for the present application; either as the homopolymer or as a copolymer. The natural copolymer is translucent to opaque and may be coloured at very low costs.
The clips of acetal polymer may be manufactured by using standard types of injection molding equipment and the melt temperature may vary from 360 to 450F with no sacrifice in part strength. After forming, the clips can be finished 1 by a variety of finishing operations including annealing, adhesion and fastening, machining and decorating, if desired.
Clips manufactured of acetal polymer possess high strength and rigidity, excellent frictional properties and outstanding resistance to fatigue. Thus, one of the serious drawbacks of the clips of the prior art, namely, fatigue, has been successfully overcome. Also, the clips of the present invention show excellent tensile and flexural properties, making them particularly suitable for the present applicat~on.
With the clips of the prior art, one of the problems which has not been overcome is that the clips will release from the drum during usage. As noted hereinbefore, the drum 58 rotates at a great rate of speed thereby tending to "throw off"
the font from the face of the drum. The applicant has found that the clips 10 and 12 of the present invention securely hold the font to the drum and do not suffer from fatigue during use.
For an explanation of how the clips hold the font to ~- the drum, reference is now made to Figures 5 and 6 of the drawings. To secure the font to the drum, one end of the font is placed on the drum so that the hooks 60 and 62 may be inserted through apertures 52, 54 and over the flat end portions 18, 20 : of the clip 10. The Eosition of the font is then adjusted until the alignment apertures 56 are secured to the alignment protrusions on the face of the drum as explained hereinbefore.
Protrusions 64 are usually in the form of balls and interact with the inner surfaces 37, 39 of the ends 36, 38 of the clips 12. As shown in Figure 5, surface 39 has, in the preferred embodiment, a slope of about 30 whereas the opposite surface 43 may have a slope of about 2. (The slope of surface 39 is not restricted to an angle of 30 but may have any slope greater than 50).
~9_ ~075948 1 tSurfaces 37, 39 and 41, 43 are identical although at opposite ends of the clip 12). When the font is to be placed on the drum, the end 38 of clip 12 is distorted manually from the position shown in dotted lines to the position indicated in solid lines in Figure 5. When released, the clip assumes the position shown in the l'chain-dot" line providing contact at the point 35 with the protrusion 64.
If the pro~rusions 64 were not present, the clip, because of its resilient character, would assume its normal position shown in dotted lines. This is shown in top view of Figure 6 of the drawings. Contact point 35 occurs on the sloping ; surface 39 of the end 38 of the clip 12.
It is thought that the sloping surface on one end of the clip, in conjunction with the ball or protrusion, creates a downward and inward pressure which forces the clip towards the base of the ball thereby tending to hold the clip in contact with the ball when the drum is rotated.
The V-shaped portions 32, 34 on the clip 12 provide resiliency to the clip and distribute the bending or distorting 20 force applied to the clip when placed on the protrusions, over the entire length of the body to prevent any overstressing of the body. Contrary to the devices of the prior art, the clip is hèld securely to the protrusion during rotation of the drum, which in fact, causes the clip to be held more securely to the drum rather than tending to throw the clip off the drum as experienced with the prior art devices.
The clips themselves do not extend the full height of - the font. As shown in Figure 3, one end of the clips is aligned with an edge ~of the font but the opposite end of the clips terminates at the edge of the alignment apertures 56. Thus, the -lQ-~0759~8 1 clips do not interfere with timing marks 68 on the font 46.
Although the disclosure describes and illustrates a preferred embodiment of the invention, it is to be understood the invention is not restricted to this particular embodiment.
~ '' ' ' .
.
- . -11- .
Claims (12)
1. Retaining means adapted to releasably secure a font to a rotatable character drum, said retaining means comprising a first clip and a second clip, each clip adapted to be secured to a respective side edge of said font, said first clip having flattened peripheral end portions, and said second clip having flexible V-shaped end portions, said end portions of said first and second clips being adapted to releasably secure said font to said drum.
2. Retaining means as claimed in claim 1 wherein rivet holes are provided in the central portion of each clip and said clips are secured to said font by rivets.
3. Retaining means as claimed in claim 1 wherein the central portion of each clip is recessed.
4. Retaining means as claimed in claim 1 wherein said clips are made of an acetal polymer.
5. In a font for use in a photocomposing machine having a rotatable drum, said font having a plurality of characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a pair of hooks adapted to project through a first pair of corresponding apertures in said font and a pair of protrusions adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned near one width edge of said font and said second pair of apertures positioned near the opposite width edge of said font, the improvement comprising retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first clip
5. In a font for use in a photocomposing machine having a rotatable drum, said font having a plurality of characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a pair of hooks adapted to project through a first pair of corresponding apertures in said font and a pair of protrusions adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned near one width edge of said font and said second pair of apertures positioned near the opposite width edge of said font, the improvement comprising retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first clip
Claim 5 continued ...
secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
6. A font as claimed in claim 5 wherein said clips are rivetted to said font.
7. A font as claimed in claim 5 wherein said clips are made of an acetal polymer.
8. In a photocomposing machine which includes a rotatable drum, a font having characters thereon and releasably secured to said drum, means for projecting the characters on said font to a recording medium, said font having a plurality of characters thereon arranged in a predetermined sequence and position, a plurality of alignment apertures, and a series of timing marks on one edge (length), said drum carrying a pair of hooks adapted to project through a first pair of corresponding apertures in said font and a pair of protrusions adapted to protrude through said pair of corresponding apertures in said font, said first pair of apertures positioned near one width edge of said font and said second pair of apertures positioned near the opposite width edge of said font, the improvement comprising retaining means secured to said font and adapted to releasably secure said font to said drum, said retaining means comprising a first clip and a second clip, said first clip secured to said font and having flattened end portions which engage said pair of hooks, said second clip having flexible V-shaped end portions which engage said pair of protrusions which protrude through said second pair of apertures and secure said font to said drum.
9. A photocomposing machine as claimed in claim 8 wherein said clips are made of an acetal polymer.
10. In a font and a photocomposing machine as claimed in claim 5, wherein said protrusions are spherical in shape, the improvement as claimed in claim 5 wherein the portions of said second clip which engage said spherical protrusions have an outward and downward slope of approximately 30°.
11. In a photocomposing machine as claimed in claim 8 wherein said protrusions are spherical in shape, the improvement as claimed in claim 8 wherein the portions of said second clip which engage said spherical protrusions have an outward and downward slope of approximately 30°.
12. A photocomposing machine as claimed in claim 11 wherein said clips are made of an acetal polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA296,886A CA1075948A (en) | 1978-02-15 | 1978-02-15 | Photocomposing font clip with flexible v-shaped end portions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA296,886A CA1075948A (en) | 1978-02-15 | 1978-02-15 | Photocomposing font clip with flexible v-shaped end portions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075948A true CA1075948A (en) | 1980-04-22 |
Family
ID=4110764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA296,886A Expired CA1075948A (en) | 1978-02-15 | 1978-02-15 | Photocomposing font clip with flexible v-shaped end portions |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1075948A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114506180A (en) * | 2022-02-21 | 2022-05-17 | 上海立达学院有限公司 | Art planar design typeface adjusting device |
-
1978
- 1978-02-15 CA CA296,886A patent/CA1075948A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114506180A (en) * | 2022-02-21 | 2022-05-17 | 上海立达学院有限公司 | Art planar design typeface adjusting device |
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| Date | Code | Title | Description |
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| MKEX | Expiry |