Reel holder for use in tape winding apparatus

A reel holder for use in a tape winding apparatus comprises a cylindrical drum unit which is rotated by the tape winding apparatus. A plurality of lock pins are radially movably mounted in a peripheral portion of the drum unit. Each each lock pin is axially movable between a projected position wherein an outer end thereof is projected outwardly from a cylindrical outer wall of the drum unit and a retracted position wherein the outer end thereof is retracted into the drum unit. First and second buttons are mounted on an axial end of the drum unit. Each button is movable in parallel with the axis of the drum unit between raised and depressed positions with respect to the axial end of the drum unit. A transmission device is installed in the drum unit and operated in such a manner as to move the lock pins to the projected position when the first button is moved to the depressed position and permit the lock pins to return to the retracted position when the second button is moved to the depressed position.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates in general to holders for holding a rotating 
member, and more particularly to reel holders for use in tape winding 
apparatus. More specifically, the present invention is concerned with 
pancake reel holders for use in tape winding apparatus of a type which 
winds a longer tape as wrapped around a pancake reel into video cassettes 
or the like. 
2. Description of Related Applications 
The present invention has relation to both U.S. patent application Ser. No. 
07/957,473 filed on Oct. 7, 1992 by the same applicant and U.S. patent 
application Ser. No. 08/038,675 filed on Mar. 26, 1993 by the same 
applicant. The former U.S. application is based on Japanese Patent 
Application 260386/1991 (filed Oct. 8, 1991), Japanese Patent Application 
285072/1991 (filed Oct. 30, 1991) and Japanese Patent Application 
302033/1991 (filed Nov. 18, 1991) claiming the priority of the same, while 
the latter U.S. application is based on Japanese Patent Application 
80074/1992 (filed Apr. 1, 1992) and Japanese Patent Application 80072/1992 
(filed Apr. 1, 1992) claiming the priority of the same. 
In order to clarify the task of the present invention, a reel holder 
described in the above-mentioned U.S. patent application Ser. No. 
07/957,473 will be outlined with reference to FIG. 7 of the accompanying 
drawings prior to making a detailed description on the present invention. 
In FIG. 7, the reel holder 300 is shown as carrying thereon a reel hub 124. 
Although not shown in the drawing, a longer tape is to be wound around the 
reel hub 124 to constitute a so-called "pancake reel" (120, see FIG. 8). 
In the drawing (FIG. 7), the reel holder 300 generally comprises a reel 
base 122 which is a part of a tape winding apparatus (not shown) and 
rotated about its axis. The reel hub 124 is detachably put on the reel 
base 122 through three pawl members 115 which are incorporated with a knob 
113. The three pawls 115 can be radially expanded and contracted in 
response to rotation of the knob 113. That is, when the knob 113 is turned 
in the direction of the arrow "R", the pawls 115 are expanded to grasp the 
reel hub 124. With this, the reel hub 124 is held by the reel base 122. 
While, when the knob 113 is turned in the direction of the arrow "L", the 
pawls 115 are contracted to release the reel hub 124. With this, the reel 
hub 124 can be removed from the reel base 122. 
Although not shown in the drawing, the reel hub 124 has at a cylindrical 
inner wall of the center bore thereof an axially extending groove, and the 
reel base 122 is formed with a corresponding projection. Upon proper 
fitting of the reel hub 124 onto the reel base 122, the groove and the 
projection are mated to prevent relative rotation therebetween. Thus, 
under his condition, the reel hub 124 and the reel holder 300 can rotate 
like a single unit. 
FIG. 8 shows a tape winding apparatus to which the above-mentioned reel 
holder is practically applied. The tape winding apparatus is described in 
the above-mentioned U.S. patent application Ser. No. 08/038,675. 
As shown in the drawing, the tape winding apparatus 400 comprises generally 
a pancake reel autochanger 110, a second splicing device 130, a tape 
terminal end processing device 136, a tape front end withdrawing device 
150, a first splicing device 170, a tape withdrawing and winding device 
180 and a cassette loading device 190. 
As shown, the reel base 122 on which the reel hub 124 as the pancake reel 
120 is disposed is a part of the tape winding apparatus 400. The detail of 
the tape winding apparatus 400 is described in the U.S. patent application 
Ser. No. 08/038,657. 
SUMMARY OF THE INVENTION 
It is an object of the present invention to provide a reel holder which can 
be used as a substitute for the above-mentioned reel holder disclosed in 
U.S. patent application Ser. No. 07/957,473. 
It is another object of the present invention to provide a reel holder 
which is superior in handling to the reel holder of U.S. patent 
application Ser. No. 07/957,473. 
It is a further object of the present invention to provide a reel holder 
onto which a pancake reel can be put with easy fitting steps. 
It is a still further object of the present invention to provide a reel 
holder which can assuredly hold a pancake reel thereon. 
According to the present invention, there is provided a holder which 
comprises a cylindrical base body; a plurality of lock pins radially 
movably mounted in a peripheral portion of the cylindrical base body, each 
lock pin being axially movable between a projected position wherein an 
outer end thereof is projected outwardly from a cylindrical outer wall of 
the base body and a retracted position wherein the outer end thereof is 
retracted into the base body; first and second buttons mounted on an axial 
end of the cylindrical base body, each button being movable in parallel 
with the axis of the cylindrical base body between raised and depressed 
positions with respect to the axial end; and a transmission device 
installed in the cylindrical base body and operated in such a manner as to 
move the lock pins to the projected position when the first button is 
moved to the depressed position and return the lock pins to the retracted 
position when the second button is moved to the depressed position. 
According to the present invention, there is further provided a reel holder 
for use in a tape winding apparatus having a rotation shaft. The reel 
holder comprises a cylindrical drum unit coaxially connected at one axial 
end thereof to the rotation shaft to rotate therewith; a plurality of lock 
pins radially movably mounted in a peripheral portion of the drum unit, 
each lock pin being axially movable between a projected position wherein 
an outer end thereof is projected outwardly from a cylindrical outer wall 
of the drum unit and a retracted position wherein the outer end thereof is 
retracted into the drum unit; an elastic band put around the cylindrical 
outer wall in a manner to cover the outer ends of the lock pins, the 
elastic band biasing the lock pins toward the retracted position when the 
lock pins are projected; a circular button coaxially disposed on the other 
axial end of the cylindrical drum unit, the circular button having raised 
and depressed positions with respect to the other axial end; an annular 
button coaxially disposed on the other axial end of the cylindrical drum 
unit in a manner to concentrically surround the circular button, the 
annular button having raised and depressed positions with respect to the 
other axial end; and a plurality of transmission mechanisms installed in 
the drum unit and respectively incorporated with the lock pins, each 
transmission mechanism moving the corresponding lock pin to the projected 
position against a biasing force of the elastic band when actuated by the 
circular button and permitting the lock pin to return to the retracted 
position with an aid of the biasing force of the elastic band when 
actuated by the annular button.

DETAILED DESCRIPTION OF THE INVENTION 
Referring to FIGS. 1 to 6, particularly FIGS. 1 and 2, there is shown a 
reel holder according to the present invention, which is generally 
designated by numeral 10. 
It is to be noted that FIG. 1 lacks some parts of the reel holder for 
clarification of the drawing. 
In FIGS. 1 and 2, the reel holder 10 of the invention is shown as being 
mounted on a rotation shaft 13. The rotation shaft 13 is a part of a tape 
winding apparatus, such as, a part of the afore-mentioned tape winding 
apparatus 400 as shown in FIG. 8. That is, the rotation shaft 13 is 
rotated about its axis under a given condition of the tape winding 
apparatus. 
The reel holder 10 comprises a cylindrical rotation drum 15 coaxially 
connected to the rotation shaft 13 to rotate therewith. As will become 
apparent as the description proceeds, the rotation drum 15 carries thereon 
a pancake reel (not shown) and rotates the same. For putting the pancake 
reel onto the rotation drum 15, manual or automatic operation is used. 
As is seen from FIG. 2, the rotation drum 15 has at an axially front (or 
upper, as viewed in the drawing) end thereof a drum cover 17 mounted 
thereto. Thus, a drum unit (15+17) is constituted, which has an internal 
space. 
As is seen from FIGS. 1 and 2, above the drum cover 17, there are arranged 
both a circular lock button 21 and an annular release button 31. The 
release button 31 concentrically surrounds the lock button 21. The outer 
diameter of the release button 31 is equal to or smaller than the diameter 
of the cylindrical outer wall of the rotation drum 15. 
As shown in FIG. 2, the lock button 21 is fixed to a front end of a lock 
spindle 23 which is slidably received in a center bore (no numeral) formed 
in the drum cover 17, while, the release button 31 is fixed to front ends 
of three release spindles 33 (only one is shown) which are slidably 
received in three bores (no numerals) which are formed in a peripheral 
area of the drum cover 17 at evenly spaced intervals. Furthermore, the 
release button 31 is fixed to front ends of three guide rods 38 which are 
sized to be received in respective blind bores (no numerals) formed in the 
drum cover 17. Each blind bore receives a lower portion of a coil spring 
39 which is disposed about the guide rod 38 and seated on the release 
button 31. Due to the work of these three coil springs 39, the release 
button 31 is biased away from the drum cover 17. The three guide rods 38 
and the three release spindles 33 are alternately positioned. 
The center bore of the drum cover 17 is provided with a linear bush 27 for 
achieving a smoothed axial movement of the lock spindle 23 relative to the 
drum cover 17, and the three peripheral bores of the drum cover 17 are 
provided with respective linear bushes 37 for achieving a smoothed axial 
movement of the three release spindles 33 relative to the drum cover 17. 
As shown in FIG. 2, all the spindles 23 and 33 have lower ends which are 
projectable into the interior of the drum unit (15+17). Preferably, front 
surfaces of the lock button 21 and release button 31 are flush with each 
other under the illustrated neutral condition of the reel holder 10. 
As is best seen in FIG. 1, a smaller circular plate 25 is secured to the 
inner end the lock spindle 23, and a larger annular plate 35 (as 
illustrated by phantom line) is secured to lower ends of the three release 
spindles 33. Thus, the lock button 21, the lock spindle 23 and the smaller 
circular plate 25 constitute a single unit, and the release button 31, the 
three release spindles 33 and the larger plate 35 constitute another 
single unit. 
As is seen from FIG. 2, the circular plate 25 is biased downward in the 
drawing by a coil spring 29 which is received in an annular groove (no 
numeral) formed in the drum cover 17. 
As is understood from FIGS. 1 and 2, the rotation drum 15 is formed at its 
cylindrical outer wall with six bores 15A which are positioned at equally 
spaced intervals. Within each bore 15A, there is slidably received a lock 
pin 45. 
As is seen from FIG. 2, a rubber band 47 is put around the cylindrical 
outer wall of the rotation drum 15 in a manner to cover outer ends of the 
lock pins 45. Thus, under the neutral condition of the reel holder 10 as 
shown in this drawing, the lock pins 45 are biased by the rubber band 47 
to assume their retracted positions. 
Within the drum unit (15+17), there are installed six transmission 
mechanisms which are arranged am equally spaced intervals and respectively 
incorporated with the six lock pins 45 and the afore-mentioned smaller 
circular plate 25 and larger annular plate 35. 
As will become apparent as the description proceeds, when the lock button 
21 is pushed, the six transmission mechanisms function to cause the lock 
pins 45 to assume their projected positions (see FIG. 4) against the force 
of the rubber band 47. While, when then the release button 33 is pushed, 
the six transmission mechanisms function to cause the lock pins 45 to 
assume their retracted positions (see FIG. 3) with an aid of the rubber 
band 47 and to cause the lock button 21 to return to its raised position. 
As is best seen from FIG. 2, each transmission mechanism comprises a swing 
lever 51 which has first, second and third arms each being equipped at a 
leading end with a roller 51A, 51B or 51C. These rollers 51A, 51B and 51C 
will be referred to as "first, second and third rollers" hereinafter for 
ease of understanding. The swing lever 51 is pivotally connected through a 
pivot pin 55 to a bracket 53 which is secured to the drum cover 17. The 
first roller 51A is constantly engaged with the smaller circular plate 25 
of the lock button 21, and the third roller 51C is engaged with the larger 
annular ring 35 of the release button 31 under a given condition. 
Positioned near the swing arm 51 is a press lever 61 which has a longer 
first arm and a shorter second arm. The longer first arm has at its 
enlarged end a cam portion 61A which is engageable with the second roller 
51B of the above-mentioned swing arm 51. The shorter second arm of the 
press lever 61 is equipped at a leading end with a roller 61B which is 
constantly engaged with an inner end of the corresponding lock pin 45. As 
shown, the press lever 61 is pivotally connected through a pivot pin 65 to 
a bracket 63 which is secured to the rotation drum 15. 
As is best seen from FIG. 2, the longer first arm of each press lever 61 is 
biased upward by a coil spring 67 which is disposed about a guide rod 67A 
tightly held by the rotation drum 15. 
In the following, operation of the reel holder 10 of the present invention 
will be described with reference to the drawings. 
For ease of understanding, the description will be commenced with respect 
to the neutral condition of the reel holder 10 as shown in FIG. 2. 
Under this neutral condition, the lock and release buttons 21 and 31 assume 
their raised inoperative positions, the first roller 51A of each swing 
lever 51 assumes its uppermost position pressing the smaller circular 
plate 25 against the inner surface of the drum cover 17, the second roller 
51B is engaged with the cam portion 61A of the longer first arm of the 
press ever 61 causing the longer first arm to assume its lowermost 
position against the force of the coil spring 67, and the roller 61B of 
the press ever 61 assumes its innermost position causing the lock pin 45 
to assume its retracted position with an aid of the force of the rubber 
band 47. 
Accordingly, in this condition, a hub portion 11 (see FIG. 4) of a pancake 
reel, such as the pancake reel 120 as shown in FIG. 8, can be easily put 
on the cylindrical outer wall of the rotation drum 15. 
Under this neutral condition of the reel holder 10, the force produced by 
the six coil springs 67 is much greater than that produced by the coil 
spring 29, so that the smaller circular plate 25 is forced to assume its 
uppermost position irrespective of the force of the coil spring 29. 
When, with the pancake reel kept put on the rotation drum 15, the lock 
button 21 is depressed by an external force manually or automatically, the 
smaller circular plate 25 pushes down the first roller 51A of each swing 
lever 51. With this, as is seen from FIG. 4, the swing lever 51 is pivoted 
counterclockwise (in the drawing) in a snap-action manner about the pivot 
pin 55 disengaging the second roller 51B from the cam portion 61A. Thus, 
the longer first arm of the press lever 61 is slightly raised by the force 
of the coil spring 67 causing the roller 61B of the shorter second arm of 
the press lever 61 to press the lock pin 45 against the force of the 
rubber band 47. Thus, each lock pin 45 assumes the projected position 
pressing the rubber band 47 against a cylindrical inner surface of the hub 
portion 11 of the pancake reel. Thus, under this condition, the pancake 
reel is tightly held on the rotation drum 15 and thus can rotate therewith 
like a single unit. 
Due to the nature of the snap-action movement of the swing lever 51 thus 
carried out, the swing lever 51 stays at the depressed position of FIG. 4. 
As shown in this drawing, due to the force of the coil spring 29, the lock 
button 21 stays at the depressed position even when the external force is 
removed therefrom. 
When now the release button 31 is depressed by an external force manually 
or automatically, the annular plate 35 pushes down the third roller 51C of 
each swing lever 51, as will be understood from FIG. 4. With this, as will 
be seen from FIG. 3, the swing lever 51 is pivoted clockwise (in FIG. 3) 
in a snap-action manner about the pivot pin 55 bringing the second roller 
51B to the cam portion 61A of the press lever 61 and bringing the first 
roller 51A to its uppermost position. Thus, the lock button 21 is returned 
to the raised position against the force of the coil spring 29 and the 
longer first arm of the press lever 61 is moved to the lowermost position 
against force of the coil spring 67. That is, the swing lever 51 and the 
press lever 61 come to the respective positions which they were given when 
the reel holder 10 assumed the above-mentioned neutral condition of FIG. 
2. Thus, the lock pins 45 take the retracted positions releasing the hub 
portion 11 of the pancake reel. 
When thereafter the external force applied to the release button 31 is 
removed, the release button 31 is returned to the raised position due to 
the force of the coil springs 38 (see FIG. 2). Thus, the neutral condition 
of the reel holder 10 is established. 
In FIG. 5, there is shown the detail of the swing lever 51 and the press 
lever 61 under the neutral condition of the reel holder 10. That is, the 
press lever 61 ms kept pressed down to its lowermost position by the 
second roller 51B of the swing lever 51. 
As shown in the drawing, the cam portion 61A of the press lever 61 
constitutes a curved wall which faces toward the pivot center "O" of the 
swing lever 51. The radius of curvature of the curved wall is "R" which is 
equal to the distance between the pivot center "O" (more specifically, the 
axis of the pivot pin 55) and the outermost peripheral portion of the 
second roller 51B. As is understood from this drawing, under the neutral 
condition of the reel holder 10 wherein the second roller 51B of the swing 
lever 51 contacts the cam portion 61A of the press lever 61 at a point 
"P", an imaginary circle "C" including the curved wall can have its center 
at the pivot center "O" of the swing lever 51. 
With this arrangement, the force "Fo" applied to the press lever 61 by the 
coil spring 67 produced a force "F" with which the press lever 61 presses 
the second roller 51B toward the pivot center "0" of the swing lever 51. 
This means that when the reel holder 10 is under the neutral condition, 
the swing lever 51 is given no angular moment. 
Referring to FIGS. 6A, 6A', 6B, 6B', 6C and 6C', there are shown various 
members 12 which can be held by the reel holder 10 of the present 
invention. In fact, in case of the cylindrical members 12A and 12B of 
FIGS. 6A and 6B each having a cylindrical center bore 12a or 12b, they can 
be put onto the rotation drum 15 without modifying the reel holder 10 of 
the invention. That is, by inserting the cylindrical rotation drum 15 into 
the cylindrical center bore 12a or 12b, the holding is simply achieved. 
However, in case of the members 12A' and 12B each having a rectangular 
center bore 12a' or 12b', the rotation drum 15 of the reel holder 10 
should be shaped to have a rectangular cross section. As is seen from FIG. 
6C', a center recess 12c' may be used in place of the center bore 12c of 
the member 12C of FIG. 6C. However, in this case, it becomes necessary to 
change the position of the lock and release buttons 21 and 31 of the reel 
holder 10.