US3882562A

US3882562A - Platform binding strip pincher method and apparatus

Info

Publication number: US3882562A
Application number: US450407A
Authority: US
Inventors: Alton R Copithorne
Original assignee: Boston Machine Works Co
Current assignee: Boston Machine Works Co
Priority date: 1974-03-12
Filing date: 1974-03-12
Publication date: 1975-05-13
Anticipated expiration: 1992-05-13

Abstract

A machine for simultaneously folding and pinching a binding strip at a bevel of a shoe platform. A pair of resilient heads constrained for relative movement towards and away from each other are adapted to engage the binding strip and shoe platform inserted therebetween. Each head is formed with upper and lower lobes disposed about an inwardly converging guideway defining a structure having a substantially B-shaped profile in right cross section. Each head is formed with a depression at the central portion thereof about the guideway which operates as a guide for inserting the platform. The resilient heads, each restrained in a C-shaped frame, cooperate to fold and pinch the ends of the binding strip to the bevel of the platform, the resilient heads enveloping the margins of the bevels when urged towards one another and pressed against the platform inserted therebetween. As the resilient heads are urged towards one another, pressure is exerted on the outer edges of the bevel to set the binding strip. As the resilient heads proceed towards one another, additional pressure is exerted to progressively pinch the binding strip around the bevel.

Description

United States Patent Copithorne PLATFORM BINDING STRIP PINCHER METHOD AND APPARATUS Alton R. Copithorne, Rowley, Mass.

Inventor:

Assignee: Boston Machine Works Company,

Lynn, Mass.

Filed: Mar. 12, 1974 Appl. No.: 450,407

References Cited UNITED STATES PATENTS 6/1954 Haas l2/24.5 2/1960 Stewart 12/1 F 9/1965 Wilisch 12/1 R Primary Examiner-Patrick D. Lawson Attorney, Agent, or Firm-Morse, Altman, Oates & Bello 51 May 13, 1975 [57] ABSTRACT A machine for simultaneously folding and pinching a binding strip at a bevel of a shoe platform. A pair of resilient heads constrained for relative movement towards and away from each other are adapted to engage the binding strip and shoe platform inserted therebetween. Each head is formed with upper and lower lobes disposed about an inwardly converging guideway defining a structure having a substantially B-shaped profile in right cross section. Each head is formed with a depression at the central portion thereof about the guideway which operates as a guide for inserting the platform. The resilient heads. each restrained in a C-shaped frame, cooperate to fold and pinch the ends of the binding strip to the bevel of the platform, the resilient heads enveloping the margins of the bevels when urged towards one another and pressed against the platform inserted therebetween. As the resilient heads are urged towards one another, pressure is exerted on the outer edges of the bevel to 'set the binding strip. As the resilient heads proceed towards one another, additional pressure is exerted to progressively pinch the binding strip around the bevel.

18 Claims, 11 Drawing Figures |o\ H6 n2 as 84 52 I08 I \FROM AIR |22 :24 SUPPLY I39 94 12? 7s 6 as so as as 94 s2 s4 2 137 92 9 9 as '02 72 I33 7o 40 132 as I26 74 e2 64 3e 34 52 134 Q g -42 Hmmgmm I 31975 18829562 SHEET 3 BF 4 FIG. 8

PLATFORM BINDING STRIP PINCI-IER METHOD AND APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention:

The present invention relates to binding machines and, more particularly, is directed towards a machine for attaching binding strips to the bevel of shoe platforms.

2. Description of the Prior Art:

Present day platform binding machine attach a binding strip to the forward edge and sides of a shoe platform, the binding strip at the slope or bevel at the back of the platform is not attached. The binding strip is then manually pressed and folded against the bevel, this function being a tedious and time-consumming operation. A need has arisen to provide a binding machine for automatically attaching binding strips to the bevel of shoe platforms.

SUMMARY OF THE INVENTION The present invention provides a platform binding pinch machine and method for automatically attaching binding strips at the bevel at the back of a shoe platform. The machine is characterized by a pair of resilient heads formed with upper and lower lobes disposed about a guideway, each resilient head retained in a C- shaped frame. The resilient heads are constrained for cooperative relative movement towards and away from each other. A depression adapted to receive the edge of the platform at the bevel thereof is formed at a central portion of each head about the guideway. Each C- frame is mounted to a leaf which is operatively connected to an actuator, the leaves operating to move the resilient heads towards one another when the actuator is energized. In operation, a platform having a binding strip attached to its forward and side edges is inserted between the resilient heads in registration with the guideways, the actuator being in a deenergized position and the resilient heads being in an open position. Thereafter, the actuator is energized and the resilient heads are moved towards one another, and pressure is exerted against the outer edges of the bevel to set the binding strip. As the resilient heads proceed inwardly, portions of the upper and lower lobes of each resilient head envelop the bevel and additional pressure is exerted to progressively pinch the binding strips around the bevel. In consequence, the binding strip is folded and pinched about the bevel of the platform.

Other objects, features and advantages of the present invention will become more apparent after considering the following detailed disclosure.

The invention accordingly comprises the apparatus possessing the construction, combination of elements, and arrangement of parts that are exemplified in the following detailed disclosure, the scope of which will be indicated in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the nature and objects of the present invention, reference should be had to the following detailed description taken in connection with the accompanying drawings wherein:

FIG. 1 is a perspective of a platform binding pinch machine embodying the present invention;

FIG. 2 is a front plan of the cooperating heads of FIG.

FIG. 3 is a cross section taken along the lines 3-3 of FIG. 2;

FIG. 4 is a cross section taken along the lines 44 of FIG. 2;

FIG. 5 is a cross section taken along the lines 55 of FIG. 2;

FIG. 6 is a perspective of the cooperating heads of FIG. 2 in an opened position having a platform inserted therebetween;

FIG. 7 is a cross section of the cooperating heads of FIG. I initially engaging the platform inserted therebetween;

FIG. 8 is a cross section of the cooperating heads further advanced from the position shown in'FIG. 7;

FIG. 9 is a perspective of a platform having the binding strip folded and pinched;

FIG. 10 is a perspective of a pair of cooperating heads for use with a larger platform than that shown in FIG. 6; and

FIG. 11 is a perspective of a pair of cooperating heads for use with a smaller platform than that shown in FIG. 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, particularly FIGS. 1 and 6, there is shown a platform binding pinch machine 10 for simultaneously folding and pinching a binding strip 12 about a bevel 14 of a workpiece 16, for example a shoe platform. It is to be noted that the sides of platform 16 about bevel 14 rearwardly converge as viewed in FIG. 9. Platform binding pinch machine 10 is organized about a base 18 that is mounted on a table 20. Platform binding pinch machine 10 is characterized by a pair of cooperating, coplanar

resilient heads

22, 24, which are constrained for relative movement towards and away from each other. Resilient head 22 is restrained within a substantially C-shaped bracket 26 which embraces the rearward, upper and lower faces of head 22. Bracket 26 is provided with a bar 28 at a rearward face thereof which cooperates with a clamp 30 and strap 32 to retain head 22. Bracket 26 is mounted to a carriage 34 which is slidable along

guides

36, 38. One end of each

guide

36, 38 is mounted to a block 40 and the other end is mounted to a block 42, the longitudinal axes of

guides

36, 38 being in spaced parallel relationship. Stops 48 and 50 are mounted to blocks 40 and 42, respectively, between

guides

36, 38. Block 40 is mounted on a support 52 which is fastened to base 18 and block 42 is mounted on base 18.

Head 24 is restrained within a substantially C-shaped bracket 54 which embraces the rearward, upper and lower faces of head 24. Bracket 54 is provided with a bar 56 at a rearward face thereof which cooperates with a clamp 58 and a strap 60 to retain head 24.

Bracket 54 is mounted to a carriage 62 which is slidable on

guides

64 and 66. One end of each

guide

64 and 66 is mounted to a block 68 and the other ends are mounted to block 42, the longitudinal axes of

guides

64 and 66 being mounted in spaced parallel relationship. Stops 70 and 72 are mounted to

blocks

42, and 68, respectively, between

guides

64 and 66. Block 68 is mounted on a support 74 which is mounted to base 18.

Guides

36, 38, 64 and 66 are coplanar,

guides

36, 38 being angularly disposed with respect to

guides

64, 66.

The working faces of

heads

22 and 24 are disposed in planes which rearwardly converge as shown in FIG. 1.

Heads

22 and 24 are constrained for relative movement along their respective guides towards and away from each other by means of an actuator 76. Actuator 76 includes a cylinder 78 and a reciprocable piston 80. Cylinder 78 is mounted to an arm 82 by means of a bracket 83. Arm 82 is pivoted about a pin 84 which is mounted to a plate 88 by means of a stud 86. Plate 88 is fastened to base 18. Arm 82 is formed with a slot 90 adapted to receive a screw 92 which is threaded into carriage 62. A bracket 93 at the free end of piston 80 is mounted to an arm 94 means of a stud 95. Arm 94 is pivoted about a pin 96 which is mounted to plate 88 via a stud 98. Arm 94 is formed with a slot 100 which is adapted to receive a screw 102 which is threaded into carriage 34. A link 104 formed with a slot 106 is secured to arm 94. A link 108 is fastened to arm 82.

Links

104 and 108 are attached to one another by means of a fastener 110 which is slidable within slot 106. When actuator 76 is energized, piston 80 is drawn into cylinder 78, whereby heads 22 and 24 are drawn towards one another.

In operation, air form a supply (not shown( is supplied to a line 112 through an inlet valve 114, line 112 being supported on

posts

122 and 124. The air applied to line 112 is feed through a filter 116 and a regulator 118 to a lubricator 120. The air passing through lubricator 120 is fed to an inlet 125 of a foot pedal assembly 126 via a flexible line 127. Foot pedal assembly 126 includes a lever 128 and a valve 130. Lever 128 is pivoted on a post 132 which is attached to the rearward portion of a bse 134. When foot pedal 128 is depressed, air flows from inlet 125 through valve 130 to an outlet 135 and into cylinder 78 via a flexible line 137 and a coupling 139. In consequence, actuator 76 is energized and piston 80 is retracted into cylinder 78. In consequence, heads 22 and 24 are drawn towards platform 16 inserted therebetween (FIG. 6). It is to be noted that binding strip 12 is attached to certain edge portions of platform 16 before being inserted between

heads

22 and 24, the attached binding strip 12 and platform 16 defining an intermediate assemblage. As

heads

22 and 24 proceed inwardly towards platform 16, pressure is first exerted against the side edges of bevel 14 and binding strip 12 is set against the side edge of bevel 14. As

heads

22 and 24 further proceed inwardly, additional pressure is exerted to progressively pinch and fold binding strip 12 about bevel 14 as shown in FIG. 8. The travel distances of

heads

22 and 24 are substantially equal so that both sides of platform 16 are equally engaged by the heads. In the illustrated embodiment, heads 22 and 24 are composed of an elastomer such as natural rubber with sufficient carbon black to produce a Shore hardness number in the range of 25-35. In the preferred embodiment, each head is compression molded natural rubber with sufficient carbon black to produce a Shore hardness number of 30. The details of binding

heads

22 and 24 are shown in FIGS. 2, 3, 4, and 5.

As shown in FIGS. 3, 4, and 5, head 24 has a substantially B-shaped profile in right cross section and includes an upper lobe portion 130 and a lower lobe portion 132 at the forward or working end thereof, a sub stantially vertical wall 133 at the rearward end thereof, and a pair of forwardly converging

walls

135 and 137 at the upper and lower sides, respectively. As best shown in FIG. 2, a trough 134 is formed between uppper lobe and lower lobe132, trough, 134 converg-Q ing rearwardly as viewed in FIG. 1. As shown inFIGS. i V 3, 4, and 5, upper and lower lobes 130 and132 have a thicker profile in cross-section than the crosssectional profile of walls 135,137 and the cross- 134. In the illustrative embodiment, depression 136 is a saucer shaped and depression 138 is triangular V shaped. Leading

edges

140 and 142 of

depressions

136 and 138, respectively, the leading edges being theinnermost edge as viewed in FIG. 1 andqthe right hand edge as viewed in FIG. 2, define a jig adaptedto align platform 16 with respect to head 24. Head 22 is a mir-. ror image of head 24, like elements of

heads

22 and 24 being denoted by like reference characters, the reference characters of head22 being distinguisbable by a prime notation. It is to benoted that depressions 136, I38, and depressions 136' and 138' define a hollowed out portion adapted to receive platform 16 at bevel 14,

one side of bevel 14 being receivedin depressions 136, I38 and the other side of bevel 14 being received in de. 1 pressions 136 and 138'. Leading edges 140, 1 42 and] 140 and 142" define jigs for proper orientation of platform 16 which inserted between

heads

22 and 24.

FIG. 6 shows the position of platform 16 prior to the folding and pressing operation, As shown in FIG. 6, platform 16 is in registrationwith troughs 134 andj134 and bevel 14 is in registration withdepressions 1 36,

I38 and 136 and 138.

As shown in FIGS. 7 and 8, when heads22 and 2 proceed inwardly towards platform 16, upper lobes 130 g and 130' envelop the upper face of platform 16 about bevel 14,

lower lobes

132 and 132 envelop the lower face of platform 16 about bevel 14, and troughs 134 and 134' engage the sides of platform 16.. Asheads 22 and 24 proceed inwardly towards platform 16 and I.

begin to envelop platform 16 (FIG.7) pressure is first applied to the outer edges ofbev el 14 in order to set binding strip 12 against the vertical edge:thereof. As

heads 22 and.24 continue to proceed inwardly (FIG. 8), the difference in

thickness betweenlobes

130, 132, I30 and 132 and the area at troughs 134, 134' com bined with the restraint of frames54, 56 cause increasing additional vertical force to be applied to progres-' sively pinch binding strip 12 aroundbevel 14.

Upper lobes

130, 130 and lower lobes 132, 132' operate somewhat like resilient cams to pinch and fold binding f strip 12 around bevel 14 by progressively increasingthe force or squeeze applied againstplatfonn 16 as

heads

22, 24 are urged inwardly towards one another. It has been found that by varying the thickness of

lobes

130, 132, I30 132 as well as the curvature and the durom-.

eter, the manner in which the squeeze is applied can also be varied. When heads 22 and 24 are separated, binding strip 12 is folded about bevel 14 as shown in Fig. 6.

By way of example, alternative head configurationsfor various size platforms are shown in FIGS. 10 and 11. In FIG. 10 there is shown heads l40and 142. Head 140 is formed with an upper lobe 144and a lower lobe 142 which are disposed about a trough 146. Head 142 is formed with an upper lobe 148 and a lower lobe 151) V which are disposed about trough 152. As in the case of

heads

22 and 24,

troughs

146 and 152 rearwardly converge. lnterposed between

heads

140 and 142 is a platform 154 which is somewhat large in thickness than platform 16.

Lobes

142, 144 and 148, 150 are somewhat smaller than

lobes

130, 132 and 1311' and 132, the height of

heads

22 and 24. Accordingly,

troughs

146 and 152 are somewhat larger than

troughs

134 and 134.

In FIG. 11 there is shown

heads

154 and 156 having a platform 158 interposed therebetween. Platform 158 is somewhat smaller in height than platform 16. Head 154 is formed with an upper lobe 160 and a lower lobe 162.

Upper lobes

160 and 164 are somewhat larger than lobes 130 and 130' and

lobes

162 and 166 are somewhat larger than

lobes

132 and 132. A rearwardly converging rough 168 formed between upper lobe 160 and lower lobe 162 is somewhat smaller than trough 134 and a rearwardly converging trough 170 formed between upper lobe 164 and lower lobe 166 is somewhat narrower than through 134'.

Troughs

168 and 170 are adapted to receive platform 158.

From the foregoing description it will be readily appreciated that the present invention provides a machine for simultaneously folding and pinching binding strip at the bevel of a shoe platform by means of a pair of resilient heads constrained for relative movement towards and away from each other. The configuration of the resilient heads is such that they cooperate to envelope the bevel of a shoe platform when are urged towards each other in such a manner that pressure is first exerted against the outer edges of the bevel to set the binding strip against the vertical edge and, as the heads progress inwardly, additional vertical pressure is exertd to progressively pinch the binding strip about the bevel.

Since certain changes may be made in the foregoing disclosure without departing from the scope of the invention herein involved, it is intended that all matter contained in the above description and depicted in the accompanying drawings be construed in an illustrative and not in a limiting sense.

What is claimed is:

1. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising:

a. first resilient head means;

b. second resilient head means, said first and second resilient head means constrained for relative movement towards and away from each other between a first position and a second position; and

c. means for moving said first and second resilient head means towards and away from each other;

d. said first and second resilient head means in said first position operative to receive the binding strip and workpiece inserted therebetween, said first and second resilient head means operative to engage the binding strip about opposite edges of the bevel of the workpiece when said first and second resilient head means are urged towards each other by said moving means, said first and second resilient head means operative to apply a progressively increasing force against opposite edges of the bevel when said first and second resilient head means first engage the workpiece, said first and second resilient head means operative to apply a progressively increasing force against opposite edges of the bevel and against opposite faces of the bevel for folding and pinching the binding strip about the bevel as said first and second resilient head means are urged towards said second position.

2. The machine as claimed in claim 1 wherein said first resilient head means includes a first lobe and a second lobe at a working end thereof, a trough formed between said first lobe and said second lobe.

3. The machine as claimed in claim 2 wherein said first lobe and said second lobe are formed with depressions about a central portion of said trough.

4. The machine as claimed in claim 1 wherein said second resilient head means includes a first lobe and a second lobe at a working end thereof, a trough formed between said first lobe and said second lobe, said trough converging from one side of said resilient head towards an opposite side of said resilient head.

5. The machine as claimed in claim 4 wherein said first lobe and said second lobe are formed with a depression about a central portion of said trough.

6. The machine as claimed in claim 1 wherein each said first and second resilient head means is formed with a first lobe and a second lobe at a working end thereof, a trough formed between said first lobe and said second lobe, said trough converging from one side towards an opposite side of each said resilient head means, said first resilient head means being a mirror image of said second resilient head means.

7. The machine as claimed in claim 1 wherein said second resilient means includes a first lobe and a second lobe, a trough formed between said first lobe and said second lobe, a depression formed in said first lobe and in said second lobe about said trough, said depression being shallower in said second lobe than in said first lobe.

8. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising:

a. a base;

b. first and second guide means mounted to said base;

0. first and second carriage means, said first carriage means slidable along said first guide means, said second carriage means slidable along said second guide means;

d. first frame means mounted to said first carriage means;

e. second frame means mounted to said second carriage means;

f. first resilient head means restrained in said first frame means;

g. second resilient head means restrained in said second frame means, said first resilient head means and said second head means constrained for relative movement towards and away from each other, said first resilient head means coplanar with said second resilient head means; and

h. actuator means operatively connected to said first and second carriage means for relatively moving said first and second carriage means towards and away from each other.

9. The machine as claimed in claim 8 wherein said first resilient head means includes a first lobe and a second lobe at a working end thereof, a trough formed between said first and second lobes of said first resilient head means, said first and second lobes of said first resilient head means disposed in a plane which is in perpendicular spaced relationship with a longitudinal axis of said first guide means and wherein said second resilient head means includes a first lobe and a second lobe at a working end thereof, a trough formed between said first and second lobes of said second resilient heads means, said first and second lobes of said second resilient head means disposed in a plane which is in spaced perpendicular relationship with a longitudinal axis of said second guide means.

10. The machine as claimed in claim 9 wherein said trough formed in said first resilient head means converges from one side of said first resilient head means towards an opposite side of said first resilient head means and wherein said trough formed in said second resilient head means converges from one side of said second resilient head means towards an opposite side of said second resilient head means, said first resilient head means is a mirror image of said second resilient head means.

11. The machine as claimed in claim 9 wherein said first and second lobes of said first resilient head means are formed with a depression about a central portion of said trough formed in said first resilient head means and wherein said first and second lobes of said second resilient head means are formed with a depression about a central portion of said trough formed in said second resilient head means.

12. The machine as claimed in claim 8 wherein a working end of said first resilient head means is disposed in a first plane and a working endof said second resilient head means is disposed in a second plane which is angularly disposed with respect to said first plane.

13. The machine as claimed in claim 8 wherein said first and second resilient head means are composed of an elastomer.

14. The machine as claimed in claim 12 wherein said elastomer is natural rubber having a Shore hardness number in the range of 25 to 35 15. The machine as claimed in claim 8 wherein said first and second resilient head means are composed of a natural rubber and carbon black composition having a Shore hardness number of approximately 30.

16. The machine as claimed in claim 8 wherein said first resilient head means has a substantially B-shaped profile in cross section having a rear vertical wall, upper and lower walls and a forward working end, a

first lobe and a second lobe formed at said working end, a narrowed portion formed between said first lobe and said second lobe, said first and second lobes having 17. The machine as claimed in claim 16 wherein said second resilient head means isia mirror image of said first resilient head means. a

18. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising:

a. first resilient head means; b. second resilient head means, said first and second resilient head means, said constrained for rel ative' movement towards and away from each other, said second resilient head means includinga first. lobe and a second lobe at a working end thereof, a

trough formed between said first lobe and second second lobe, said trough converging from one side of said second resilient head means towards an opposite side of said second resilient head means, said first lobe and saidsecond lobe formed with a depression about a central portion of said trough, said depression having a shallower profile in said second lobe than in said first lobe; and V head means towards and away from said other; said first and second resilient head means engaging the binding strip and workpiece inserted the'rebetween, said first and second resilient head means pinching and folding the binding strip about the bevel of the workpiece when said first and second resilient head means are moved towards each other by said moving means, a force initially exerted by said first and second resilient head means against opposite edges of the bevel when said first and second resilient head means first engage the workpiece, progressively increasing force exerted by said first and second resilient headrneans against the bevel to pinch and fold the binding strip about the bevel.

means for moving said first and second resilient

Claims

1. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising: a. first resilient head means; b. second resilient head means, said first and second resilient head means constrained for relative movement towards and away from each other between a first position and a second position; and c. means for moving said first and second resilient head means towards and away from each other; d. said first and second resilient head means in said first position operative to receive the binding strip and workpiece inserted therebetween, said first and second resilient head means operative to engage the binding strip about opposite edges of the bevel of the workpiece when said first and second resilient head means are urged towards each other by said moving means, said first and second resilient head means operative to apply a progressively increasing force against opposite edges of the bevel when said first and second resilient head means first engage the workpiece, said first and second resilient head means operative to apply a progressively increasing force against opposite edges of the bevel and against opposite faces of the bevel for folding and pinching the binding strip about the bevel as said first and second resilient head means are urged towards said second position.

8. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising: a. a base; b. first and second guide means mounted to said base; c. first and second carriage means, said first carriage means slidable along said first guide means, said second carriage means slidable along said second guide means; d. first frame means mounted to said first carriage means; e. second frame means mounted to said second carriage means; f. first resilient head means restrained in said first frame means; g. second resilient head means restrained in said second frame means, said first resilient head means and said second head means constrained for relative movement towards and away from each other, said first resilient head means coplanar with said second resilient head means; and h. actuator means operatively connected to said first and second carriage means for relatively moving said first and second carriage means towards and away from each other.

12. The machine as claimed in claim 8 wherein a working end of said first resilient head means is disposed in a first plane and a working end of said second resilient head means is disposed in a second plane which is angularly disposed with respect to said first plane.

14. The machine as claimed in claim 12 wherein said elastomer is natural rubber having a Shore hardness number in the range of 25 to 35

15. The machine as claimed in claim 8 wherein said first and second resilient head means are composed of a natural rubber and carbon black composition having a Shore hardness number of approximately 30.

16. The machine as claimed in claim 8 wherein said first resilient head means has a substantially B-shaped profile in cross section having a rear vertical wall, upper and lower walls and a forward working end, a first lobe and a second lobe formed at said working end, a narrowed portion formed between said first lobe and said second lobe, said first and second lobes having a thicker cross-sectional profile than the cross-sectional profile of said upper and lower walls And the cross-sectional profile of said narrowed portion.

17. The machine as claimed in claim 16 wherein said second resilient head means is a mirror image of said first resilient head means.

18. A machine for pinching and folding a binding strip about a bevel of a workpiece, said machine comprising: a. first resilient head means; b. second resilient head means, said first and second resilient head means, said constrained for relative movement towards and away from each other, said second resilient head means including a first lobe and a second lobe at a working end thereof, a trough formed between said first lobe and second second lobe, said trough converging from one side of said second resilient head means towards an opposite side of said second resilient head means, said first lobe and said second lobe formed with a depression about a central portion of said trough, said depression having a shallower profile in said second lobe than in said first lobe; and c. means for moving said first and second resilient head means towards and away from said other; d. said first and second resilient head means engaging the binding strip and workpiece inserted therebetween, said first and second resilient head means pinching and folding the binding strip about the bevel of the workpiece when said first and second resilient head means are moved towards each other by said moving means, a force initially exerted by said first and second resilient head means against opposite edges of the bevel when said first and second resilient head means first engage the workpiece, progressively increasing force exerted by said first and second resilient head means against the bevel to pinch and fold the binding strip about the bevel.