US1122569A - Machine for gluing and driving dowels. - Google Patents

Description

E. J. BELL.

MACHINE FOR. GLUING AND DRIVING DOW-BLS.

APPLIGATIONIILED SEPT. 22, 1913 1,1 22,569. Patented Dec. 29, 1914.

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WITNESSES: INVENTOR aw ala/1n .LIB

BY M I ZTTORM? THE NORRIS PETERS CO" FHOTO-LITHO.,WASHINGTUN, D. C

E.JIBBLL.

MACHINE FOR ewm'e AND DRIVING DOW'ELS.

APPLICATION FILED SEPT. 22, 1913-. 1 ,1 22,569, Patented Dec. 29, 1914.

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83 l/Vl/E/VTDR dww J, B zz Y Al -WW A TTORNEY THE NORRIS PETERS CQ. PHOTO-LITHO. WASHINGTON, D. C.

To all whom it may concern:

'EIDWIN J. BELL, or OSHKOSH, WISCONSIN.

MACHINE FOR GLUING AND DRIVING DOWELS.-

Specification of Letters Patent.

Patented Dec. as, 1214.

Application filed September 22, 1913. Serial No. 791,031.

Be it known that I, EDWIN J. BELL, a citizen of the United States, residing at Oshkosh, in the county of Winnebago. and

State of Wisconsin, have invented certain new and useful Improvements in Machines for Gluing and Driving Dowels, of which the following is a specification.

The invention relates to a new automatic machine for gluing and driving dowels.

The object of the invention is to provide a complete machine to automatically inject glue into previously prepared holes in the work and drive dowel pins therein at a single setting of the work.

A further object is the special design of mechanism for feeding the dowels to be driven, wherein longer or shorter dowels can be handled without change of the feeding mechanism.

A further object is to provide a work support in combination with the machine whereby dowels can be driven into the work at any desired angle.

In the drawings Figure l is a side elevation of the machine; Fig. 2 a plan view of the machine; Fig. 3 a detail of glue pump operating crank; Fig. 4 a section through the feeding mechanism; Fig. 5 a detail of the feeding mechanism in another operative position; Fig. 6 a detail of the glue pump; Fig. 7 a detail of the glue pump operating structure and Fig. 8 a side view of the work rests showing adjustable stops, and Fig. 9

is a detail view of the cam clamping device.

The numeral 1 is a main frame of cast iron of boX pattern. A tilting table 2 hinged at 3 to a bracket 4 is provided and fitted'with two tilting braces 5 for supporting same in the desired position by means of the notches 6 which rest on pins secured to the frame 1, a series of notches being formed in the braces to suit any range of work.

Mounted on top of the table is a work rest 7 disposed toward the machine end this case is a lever clamp 10, pivoted to a lug 11 and having a weight 12 to maintain a constant clamping pressure, the action of the clamp better shown in Fig. 9 is an eccentric throw of the hub of the lever '10 against the lower face of thetable so that by lifting the lever 10 the work rest 8 can be slid along to the desired point on the table and the lever dropped to firmly clamp same in that position. The table is supported by thebracket 4 which is secured to a vertically. adjustable slide 13 fitted into slideways 14 andadjustable by means of hand screw 15, thereby providing means for setting the table at any desired vertical position.

-"FF or driving the dowels into the work reciprocating driving plungers 16 are provided and are fitted into a cross bar 17 which in turn forms part of the slide 18, the slide is fitted into slideways 19 which are 'attached to or form part of the main frame 1. The slide18 has a crosshead bearing part 20 formed therewith to which is pivoted a pitman or connecting rod 21.

To actuate the pitman 21 a center crank is journaled in suitable bearings 22 which are secured to the-main frame. The center crank consists of a disk 23 and spur gear 24 held together'with a crank pin 25 to which the pitman 21 is journaled, and eX- tending shafts 26 and 27 are rigidly secured to the disk 23 and the gear 24.

A main drive shaft 28 is journaled in the frame 1 and has a pinion secured thereon and adapted to mesh with the gear 24. For driving theshaft 28 a friction clutch pulley 29 is mounted on the shaft 28 outside the frame lfhaving an outboard bearing 30 secured to the frame. The friction clutch is shown at 31 and is actuated by a foot pedal 32 which acts to start or stop the machine.

A block 33 is secured tothe top of the I frame and'hasa' plurality of rectangular grooves planed therein to receive the plungers 16. These grooves being differentially spaced so as to meet various spacing requirements of various classes of work as only two dowels at a time are driven in usual practice the space between same varying as for instance by one quarter inch from one inch to 6 inches apart, so that by means ofirrcgular spacing of the grooves any two can be used to obtain the desired spacing.

Mounted on top of the grooved block 33 a I is an incline grooved plate 34 forming the slanting bottom of a hopper for holding a supply of dowels, the spacing of the grooves conforming with that of the block 33' and arranged precisely-thereabove. The sides of the hopper 35 are rigidly secured to the,

incline plate and-the upper portion closed in front by a plate 36.

Journaled within the hopper is a toothed agitating roller 37 which closes the space between the plate 36' and the incline plate 34, a pulley 38 is mounted outside the hopper for driving or rotating the roller 37.

The grooves in the plate 3 1 are covered by a cross plate 39 having a screw 40 tapped therethrough and above each groove for the purpose of stopping the feeding of dowels in the grooves not in use. Below the screws 4-0 is mounted oscillatably a special device for feeding the dowels one by one to the driving grooves below which consists of an iron block 41 pivoted at 42 and capable of a limited rocking movement.

A headed pin 43 is fitted loosely through the block all and has a fiat spring it secured to the block at 45 and held to exert a pressure thereon to normally hold the pin A3 in the position. shown in Fig. a. At the lower edge of the block a flat strip 46 is secured and adapted to extend beyond the edge of the block and capable of entering the grooves as shown in the same figure. A hole 47 is drilled through the plate to allow the pin 43 to enter the groove when the block is in the other extreme position. By rocking the block 4L1 either the pin 43 or the strip 46 will enter the grooves and resist the travel of dowels down the incline grooves.

For actuating the block ll a bell crank 48 is secured to the spindle thereof-the latter being journaled in the side plates 35 and having a spring 4:9 to normally hold same at one extreme position while the outward travel of the slide 18 will draw the block -11 to the other extreme through the rod 50 and standard 51 which is secured to the slide, the nuts 52 providing adjustment therefor.

The gluing portion of the machine consists of specially designed glue injection pumps which are composed of a cylindrical sliding casing 53 having an injection nozzle 5 formed therewith and a lug 55 for controlling or limiting its travel. A plunger 56 is fitted slidingly in the pump casing, the parts being made preferably of brass. cross bar 57 of rectangular section is provided for supporting the plungers which are fitted into drilled holes therein spaced identically with the spacing of the grooves in the plate Another cross bar 58 is secured to the bar 57 and has a series of holes drilled therethrough with same spacing as those of the bar 57. A stud 59 is fitted to slide in said holes and has a rigid shoulder ('30 thereon to limit its downward travel, a spring 61 and collar 6:2 normally hold the stud down against the shoulder 60. The upper end of the stud passes through a hole in the lug 55 and has a nut and washer fitted on its top end. A spring 63 fitted between the shoulder and lug 55 normally holds the pump casing in its uppermost position with relation to the stud .39. By sliding the stud 59 in its bearing the pump casing is caused to travel therewith. A hole 64 is drilled through the casing for admitting glue to the pump when the stud 59 is moved up to its upward extreme posi tion, while the movement of the pump casing downward will cause the hole 6% to close and the contents of the pump to be forced out through the nozzle 5%.

The pumps are set in the desired holes to conform with the operating plungers of the driving mechanism so that two or more pumps can be used as required.

The bar 57 has trunnions 65 turned on its ends being supported thereby and is capable of a rocking movement thereon. The pumps and supporting devices are set inside of a glue box 66 which is secured to the maln frame Land has a steam jacket 67 for heating the glue. Sliding frames 68 are fitted in slideways 69 on each side of the glue box, being formed to reach over the top and down into same as shown in Fig. 7, the lower end having a hole therethrough to receive the trunnions 65 of the bar 57. It follows then that by sliding frames 68 up or down the bar 57 and glue pumps must follow therewith. i

At the uppermost position of the travel of the glue pumps, the nozzle 5% is required to enter the holes in the work before the glue is to be injected, this position is clearly shown in Fig. 5 where the pump is in the act of injecting glue. This action of the pump is obtained by rocking the bar 57 on its trunnions and is accomplished by means of a cam mechanism. One of the trunnions extends through the bracket 68 and a crank arm 0 1s fitted rigidly thereon having a side crank pin 71 secured thereto. A grooved bracket 72 having over reaching supporting means 7 3 1S fitted against the side of the glue box and is capable of vertical adjustment by means of the bolts 'u. The bracket has a cam groove 75 on its inner face, being straight for a distance following which it takes an angle laterally, as shown. The crank pin 71 is fitted to slide in this groove and adjusted to hold the pumps in vertical position when in the vertical portion of the cam groove, but causes the pumps to tip forward when it reaches the angular portion of the groove.

In order to open the hole 6% to allow glue to fill the pump the stud 59 must be pushed upward against spring 61 which is accomplished by providing a rail 76 in the bottom of the glue box of the proper height to catch the studs before the limit of the downward travel of the bar 57 is reached.

The pumps are actuated by crank and lever mechanism consisting of an adjustable throw crank Fig. 3 fitted to the shaft 26 and i has a body 77 slotted to receive a sliding block 78 which carries acrank pin 79, the crank'pin is adjusted to the desired throw by means of a screw, 80.

A shaft 81' is journaled through the frame and has a lever 82 fitted .to each side being adapted to work together, the ends of the levers are slotted and fitted over pins 83 secured in the sliding brackets 68. One of the levers 82 has an extending arm 84: forming a bell crank and an adjustable connecting rod 85 connected therefrom to the crank pin 79. By the rotating of the crank pin 79 the brackets 68 and glue pumps are caused to travel up and down, the travel being adjustable by the crank pin throw and variable length connecting rod. 7 .Between the grooved block 33 and the work to receive the dowels is arranged another block 86 having grooves precisely the same as those of the former block but is provided with means for raisingand lowering to permit space for the action of the glue pumps, the block 86 having twolevers 87 1 secured to each side and pivoted at 88, the

bent portion of the levers 87 and when reaching the straight part thereof the block 86 will be moved to its lower position.

When the work is set on the rests 7 and 8 it is necessary to gage it sidewise so it will;

properly line up to receive the dowels. I

accomplish this by forming T-slots 91 along the rests and lit bolts 92 therein. Specially formed stops 93 are fitted over the bolt so the bolt may be tightened at any point along the groove and the stop will remain loose so it can swivel on the bolt. The tail 94 of the stop is heavier than the positioning end which normally holds the positioning end above the top of the rest to enable the operator toquickly set the edge of the work against the stops for guiding, if however one or more of the stops are not used the work can be set directly down on top of them when the stop will swing down below the top surface of the rest.

In operation, the table is set to the proper height and the rest 8 and the stops 93 properly adjusted; some of the screws 40 are set down into the grooves to prevent certain grooves from delivering dowels, using only the grooves to suit the work. Dowels of the proper length to suit the work are thrown into the hopper of the machine. The rail or work into which the dowels are to be [driven is first bored to the proper number of holes, generally two, and then set on the work rests 7 and 8 with its side or end abutting against the lip 9, the rail 8 being set to the proper point so the end to be operated upon will rest at proper distance from the edge of the table 2. The work is properly guided sidewise by setting it against the previously adjusted stops 93. The machine is now started by pressing on the foot pedal 32 which engages the clutch pulley and r0- tating the crank pin 25 through the gear 24 and pinion on the drive shaft 28. This causes the reciprocation of the crosshead slide 18 through the connecting rod 21 cansing the driving plungers to slide in the grooves of the block 33. The rocking block 41 is actuated by the crosshead slide 18 through the standard 51, red 50 and. bell crank 48 to assume the position shown in Fig. l to obstruct the path of the dowels and hold them back while the one previously dropped in front of the plunger is being driven into the work, but when the plungers 16 are drawn back the standard 51 strikes the nuts 52 causing the block 41 to assume the position shown in Fig. 5 which acts as.

an escapement allowing the first trapped dowel to slide down into the grooved block 33, at the same time the pin 43is brought to bear on the following dowel under the tension of the spring 14 and holds the processionof dowels back until the lip 46 is again brought down into the groove or path of the dowels when the pin 13 releases its hold and the dowels again slide down to be stopped by the lip 46. The cycle being repeated at each stroke, it is obvious that only one dowel can drop at a time to be acted on by the driving plungers.

()ne .of the features of the invention is in the action of this escapement device in that a large range of dowel. lengths can be used because it is only necessary to have the pin 4-3 act at any point along the dowel to ef-f fectively hold it until released. A further advantage being that the action is safe against injury to the machine, it being impossible for a dowel to become caught to injure any part thereof. The action in the hopper to agitate the dowels is accomplished by'the revolving toothed drum 37 which is continually revolved to keep the dowels in motion so they will fall in the grooves of I the back stroke of .the driving plungers the pumps are brought up so the nozzle 54L lines with the holes in the work, at this point the crank pin 71 traveling in the cam groove 75 has followed the angular path portion and the pumps are tipped forward to cause the nozzles to actually enter the holes in the work, the pump cylinder here strikes the grooved block 86, which has previously tipped up under force of the weights 89 to a limited distance, and the pump brackets 68 continuing upward on their travel causes the pump plungers 56 to be forced up into the pump cylinders to discharge the contents thereof, through the nozzle and into the work. The pumps then travel back and repeat the cycle. It will be seen that the grooved block 86 must positively fall back to its seat .before a dowel can be driven because of the positive action of the studs 90 being forced under the levers 87 which control its action.

F or driving dowels in work havingslanting holes the table 2 can be tipped to the required angle and in fact the entire machine can be adjusted in its various parts to suit any class of work within its range.

It will be seen the action of the escapement blOCK in both directions is under spring control so that no damage can be done should a dowel become caught in the groove under the lip l6 or under the pin 43. To suit the various lengths of dowels the connecting rod 21 canbe adjusted by the right and left nut 95 to bring the plunger ends in the proper relative position to drive the dowels the proper depth into the work.

Having fully described the invention what I claim and desire to secure by Letters Fat out is 1. The combination of a fixed table or work support, means for supplying and driving dowels into one edge of the work on such support, of means for injecting glue into the same dowel holes from the same di- I rection in which the dowels are driven, said means comprising glue supplying devices movable into and out of the plane in which the dowel driving devices operate.

2. The combination of a fixed work support having adjustable stops, means for positioning the work thereon against said stops, means for supplying and driving dowels into previously drilled dowel holes in oneedge or end of the work on said support, means for delivering glue into the said dowel holes from the same direction in which the dowels are driven, said means comprising glue supplying devices movable into and out of the operative plane of the dowel driving devices.

3. In a machine of the class described the combination with a supporting frame having a plurality of parallel grooves horizontally disposed thereon, dowel driving plungers adapted to reciprocate within the grooves, a dowel supply disposed above the plungers and having downward extending passages, a grooved member pivoted to the frame and having its grooves normally register with the grooves in the frame, actuating devices attached thereto, a glue supply, glue pumps having vertical movement within the glue supply, adjustable means for canting the pumps forward and bringing them in contact with the vgrooved member while simultaneously raising the grooved member.

4:. In a machine of the class described the combination with a supporting frame having reciprocating dowel driving plunger-s mounted operatively thereon, a work support for immovably holding the work, a grooved member pivoted to the frame and having the grooves disposed axially with the driving plungers, means for raising and lowering the grooved member, a glue supply, glue pumps movable in and out of the glue supply and disposed below the grooved member whereby the umps alternately assume the position to inject glue along the axis of the driving plungers.

In testimony whereof I affix my signature, in the presence .of two witnesses.

EDWIN J. BELL.

Witnesses:

CLARA L. NELSON, HARRY O. LAWSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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