referring particularly to fig1 and 4 , a cap - finishing machine is shown which has a stand , base or pedestal part a that defines an air - heating and supplying chamber . also shown , are a side - positioned , ambient air pick - up and blowing plenum chamber - defining housing b for supplying air to base part a , an upright heating , fluid - receiving - mixing and dispensing chamber c that is positioned above the base part a to receive hot air therefrom , a cap - receiving positioning , expanding and stretching pair of parts of an overhead forming means of assembly d , an upright steam heat and steam - supplying tubular assembly e that is positioned between the part a and the assembly d , and a non - permeable mixing chamber defining fabric - like , sealing - off bag f that is adapted to enclose spacing between an upper portion of the base part a and the frame of the overhead assembly d . ambient air is drawn into the blower chamber of the housing b by motor - driven blower 10 through open grillwork 11 and is then introduced as a positive flow , as indicated by arrows a , into an air heating chamber of the base or pedestal part a through a connecting passageway therebetween , see arrow a of fig4 . the ambient air , as thus positively introduced into the part a , passes upwardly as heated air from open or through - extending vertical passageways defined by the fins and tubing of a heat exchanger 12 , and upwardly out of an open upper end of the base part a , as defined by a surmounting flange or rim part 26 , into the mixing chamber c ( see arrows a and b ). the non - permeable bag f , at its lower end , is provided with suitable means for tightly fitting it within an outer groove or channel of circular , surmounting flange or ring part 26 , as by means of a flexible or drawstring portion 50 ( see fig4 ). the upright , chamber - defining bag f has an upper selvage edge portion which is adapted to fit - over an upper support frame or table 30 and to seal - off the upper reaches of the table 30 by providing a close fit about a pair of right and left - hand , cap - receiving , perforated , forming parts 40 , 41 . one portion 51 of the upper edge of the bag f is adapted , as being flexible , to follow outwardly expanding and inwardly contracting movement of one part 41 of the pair parts of the assembly d . as shown in fig3 and 5 , the forming parts 40 and 41 may be of perforated metal construction of somewhat rounded or cylindrical , hollow shape to directly receive the inside of a cap to rest on their perforated top and side wall portions . the part 41 is constructed for longitudinal sliding movement on a horizontal plane with respect to the part 40 to expand the relationship therebetween and stretch a cap that is positioned thereon for refinishing . hot treating fluid ( air and / or steam ) flows upwardly from the chamber c ( see arrows d of fig4 ) into open lower ends of the pair of forming parts 40 and 41 and out through orifices in their walls ( see the arrows e ) to the inside of a cap positioned thereon . referring particularly to fig4 and 5 , the stationary forming part 40 is shown provided with a fluid or air motor 43 that is positioned therein and whose piston rod 44 extends forwardly therefrom and is secured at its end to the cooperating , opposite , adjustable forming part 41 . the adjustable part 41 , as shown particularly in fig5 has a pair of side sleeves or ears 42 which are adapted to slidably ride on a spaced - apart pair of guide rods 38 that extend along the right - hand part of the supporting frame or table 30 . an intermediately positioned , cross - extending , spacer and stop block 45 projects upwardly from the frame or table 30 to limit the maximum inward movement of the part 41 on the guide rods 38 , and a transversely extending , outer end piece 46 serves as a stop for limiting the maximum outward expanding movement of the part 41 . to conserve and concentrate the hot fluid , the frame 30 has a closing - off top plate or wall portion 35 extending about the fixed forming part 40 , and a pair of side - extending , end - positioned , closing - off plate portions 36 that extend along and above the rods 38 to define a centrally open area 37 along the extent of the adjustable movement of the adjustable part 41 . as a result , and due to the flexible coverage of the upper edge portion 51 of the sealing - off bag f , the open portion 37 will be substantially closed - off from the ambient atmosphere along the outer sides of the part 41 , and its innermost portion will be open to the spacing between the parts 40 and 41 and thus , to the inside of a cap that is positioned in a stretched relation thereon . the fluid motor 43 is connected at its opposite ends to a pair of flexible air tubings or lines 47a and 47b ( see fig3 to 5 ), which alternately or selectively serve as positive pressure flow lines for motor - operating fluid or air supplied from a conventional motor - driven air compressor unit ( not shown ), as controlled by a three - way electric solenoid - operated valve 48 . the valve 48 may be electrically controlled by a three - position foot pedestal switch 49 . when a cap is first positioned on the pair of forming parts 40 and 41 , they are in a closed or inner position with respect to each other ( see fig4 ). after a cap is received on the pair of forming parts 40 , 41 , the valve 48 is then actuated by depressing the foot pedal switch 49 to supply a positive flow of air under pressure to the left end of the motor through line 47a and provide a return or exhaust flow through the line 47b to stretch the cap between the parts 40 and 41 . then , the switch 49 may again be actuated to close - off flow of air and retain the expanded relation while the cap is being finished . thereafter , the switch 49 may be moved to move the valve 48 to its sequential third position to reverse the direction of flow through the lines 47a and 47b and thereby move the piston rod 44 inwardly to move the part 41 towards the part 40 and release the finished cap . the frame 30 is carried by a central column or post 25 which extends in an upright manner and , at its lower end , is mounted within a hub or collar 26b of the rim part 26 ( see particularly in fig6 and 7 ). the hub or collar 26b is supported centrally of the rim or flange part 26 by cross - extending spokes 26b . a rivet pin or set screw 28 may be employed for fixing the shaft 25 in position within the hub 26b . the upper end of the shaft 25 fits within a pair of stepped mounting collars or hub portions 31 and 32 by means of pins or set screws 28 . the collars 31 and 32 form an integral central support for the frame 30 . with reference to fig4 it will be noted that the column 25 may be braced by a diagonally extending member 27 which , at its upper end is secured as by rivets , to the post 25 and at its lower end is secured to the rim 26 . with particular reference to fig2 a and 3 , the steam pipe or tubular assembly e is carried on the post 25 to extend upwardly therealong in a central relation within the chamber c . this assembly is shown provided with a group of four , series or continuously connected , inner pipe or tubing members 20 , 20 &# 39 ;, 20 &# 34 ;, and 20 &# 34 ;&# 39 ; which constitute a set ( represented as 20 ) through which a continuous flow of heat - supplying steam may be attained , to not only heat the chamber c but also the chambers defined along spacing between outer sides of the members of the 20 set and inner sides of a second set 21 that has a cooperating series or group of outer pipe or tubing members represented as 21 , 21 &# 39 ;, 21 &# 34 ; and 21 &# 34 ;&# 39 ;. lower quality , less - dry , heat - supplying steam is supplied from a source , as indicated by the arrow of fig3 through an input line 15 and a separator g to the inner pipe set 20 from a lower or wet area of the separator through piping 15a . steam that has given - up heat during its series movement through pipes of the set 20 is then exhausted or fed into a return flow line 17 which is connected to an inlet end of heat exchanger 12 . as shown , the heat exchanger 12 is mounted centrally and in an upwardly spaced position within the base part a to heat a pressurized flow of air , as indicated by the arrows a and b before it is passed upwardly into the mixing chamber c . steam leaves the heat exchanger 12 through outlet 18 ( see fig2 and 3 ) and may then be returned to a suitable steam source , such as a boiler ( not shown ) for reheating and re - use . the second or outer set 21 of pipe or tubing members extends in a spaced , paired relation along the inner pipe or tubing members of the set 20 to define a heating chamber therebetween and provide a dry steam receiving chamber from which steam may be periodically directly supplied to the mixing chamber c as bursts . as shown in fig1 and 3 , dry steam from the upper portion of the separator g flows through control valve 16 and line 15b into direct , supplying piping system represented by the set of pipe or tubing members 21 . since the steam thus supplied is applied substantially uniformly in a circular area within the chamber c , it mixes with the heated air that is rising from the base a , and is then introduced to the inside of a cap that is being finished , primarily through the bottom open ends of the cap - receiving pair of forming parts 40 and 41 and out through the perforations or holes in their top and side wall portions . fig1 of the bailey u . s . pat . no . 3 , 883 , 051 shows a suitable inside - mounted electric motor and air blower assembly ( represented as 10 in my fig4 ) that may be mounted in the chamber of the housing b .
what may be termed a low - boy machine is provided with a side - positioned air - supplying blowing chamber , an air heating and upwardly and directing chamber - defining base part , a centrally disposed upright support post or column , an upright steam burst and heat - applying pipe assembly , an upper platform frame on the column that carries cap - finishing means , and a non - permeable bag positioned to extend upwardly between the base part and the upper frame to define a fluid - directing and mixing chamber for supplying steam and hot air to the cap - finishing means . the cap - finishing means has a pair of perforated cap - receiving and stretching parts through which steam and heated air is supplied to the inside of a fabric cap to be finished . the pair of parts have means for relatively moving them towards and away from each other to release and stretch a cap that is positioned thereon .