US1726859A - renholdt - Google Patents

Description

P 1929- J. E. R'E'NHOLDT 4 1,726,859

nnconn nasui'mcma mourns Filed y 30, 1927 3 Sheets-Sheet 1 I N V EN TOR.

: JUH/V E. RENHULiT BY( 5 AT NE P 3, 1929' J. E. RENHOLDT 1 1,726,859

RECORD RESURFACING MACHINE Filed July 30. 1927 3 Sheets-Sheet 2 IN VEN TOR.

JUH/V E.

P 3, 1929- J. E. RENHOLDT 1,726,859

REcoaD assunmme mcuma Filed Ju1y 30, 1927 3 Sheets-Sheet 3 A RNEY Patented Sept. 3, 1929.

UNITED STATES PATENT OFFICE.

JOHN E. RENHOLDT, OF BEIDGEPORT, CONNECTICUT, ASSIGNOR TO DICTAPHONE CORPORATION, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF NEW YORK.

RECORD-RESURFACING MACHINE.

Application. filed July 30,

This invention relates to record-resurfacing machines, and more particularly to machines for shaving record-blanks, intended for use with dictation machines.

An object of the present invention is to provide improved means for rigidly mounting the record-resurfacing tool so as to prevent vibration thereof, and thus permit a smoother surface to be obtained on the resurfaced record blank.

Another object of this invention is to provide improved means for quickly and easily locating and locking the record resurfacing tool with respect of the record in proper 1 positionfor taking'a'first or preparatory cut of predetermined depth.

Another object of the present invention is to provide improved means for automatically advancing the resurfacing tool for one or more finishing cuts of predetermined depth to be taken after the first or preparatory out has been made.

A still further object of the present invention is to provide means for causing the return of both the record-engaging tool and the advancing mechanism therefor to normal position by a single manual operation.

Other features and advantages will hereinafter appear.

In the accompanying drawings which show one form of the invention, that at present preferred- Figure 1 is a rear elevation of a recordresurfacing machine made in accordance with the present invention, the resurfacing tool (a shaving knife in this case) being in the position it'usually occupies after a record is shaved and before the knife-bar carriage is moved toward the left as viewed, to starting position. Fig. 2 is a rear view of part of the machine shown in Fig. 1, showing the automatic knife-advancing mechanism in operating position.

Fig. 3 is a side view partly in section of the machine shown in Fig. 1, showing the pivotal mounting of the knife-carrier and means for locking the resurfacing tool in the operative position, the knife-advancing mechanism being shown in the position it assumes during a shaving operation.

Fig. 4: is a side view partly in section similar to Fig. 3, but showing the parts in the positions they assume when the knifecarriage is swung upwardly preparatory to 1927. Serial No. 209,437.

being returned to position to start shaving a record.

Fig. 5 is a top plan View of the parts in the positions shown in Fig. 1, and showing the gage-bar and knife-bar mounting in dotted lines to disclose the operative relation between the gage-bar and knife-bar and the record blank when the knife-bar has been set to take a first or preparatory cut.

The shaving machine shown in the accompanying drawings is particularly adapted for shaving or otherwise resurfacing phonograph record blanks, particularly those adapted to be used with dictation machines. It comprises a frame 10 provided with a left-hand standard 11 and righthand standard 12. Supported between the standards 11 and 12 is a guide rod 13 adapted to receive a carriage 1(1 whose forward end is provided with a shoe 15 adapted to ride on a rail 16 forming part of the frame 10. The knife-bar carriage 14 extends forwardly and upwardly from the guide-rod 13 to a point above the rail 16 where it is provided with a weight 17 shaped to be conveniently grasped and to act as a hand-piece by means of which the carriage is moved.

A mandrel 18 adapted to receive a recordblank 19 is supported on the frame to be traversed by the carriage 14, which is caused to travel on the guide rod 13 and rail 16 relative to the record-blank 19 by a feed screw 20 engaged by a feed-nut 21 mounted on the carriage 14:. The feed-screw 20 is caused to rotate coordinately with the mandrel 18 by an interconnecting belt 22, and these rotatable members are usually actuated by an electric motor (not shown) mounted below the frame 10.

Phonograph record blanks are customarily cut or shaved to resurface them for use when it is desired to obliterate an old rec- 0rd before making a new record on the surface of the blank. This operation may also be accomplished by means of burnishing tools and other arrangements, and so far as some of the salient features of the present invention are concerned, it is immaterial whether the record-engaging tool used be a knife, a burnisher. or other device. However, since the method of cutting is the one most frequently used and most preferable at present, means for that purpose is illustrated herein.

Accordingly, the machine shown in the accompanying drawings comprises a knifebar 23 adapted to carry at its forward end a knife 24 usually formed of sapphire or other hard stone, This knife-bar 23 is mounted on the carriage 14: and is adapted to be moved so as to bring the knife 24 into contact with the record-surface, so that simultaneous rotation of the record and travel of the knife with the knife-bar carriage 16 while the knife is in engagement with the record causes the top surface of the record to be removed. The knife is preferably pr0- vided with chip'chute 25 into which the shavings from the record pass and through which they fall downwardly through a trough 26 on the frame 10 to a suitable container provided for the purpose of receiving the chips.

The above described structure and mechanism is common to record-resurfacing machines heretofore manufactured and used and form a partof the present invention only in so far as they are opcratively related to or combined with other mechanisms hereinafter described.

In order that the knife 24 may be quickly and easily set to proper operating position for taking the first or preliminary cut when resurfacing a record-blank, the present invention provides improved means whereby a direct manual operation, requiring no special attention on the part of the operator, causes the knife-bar to be so set that the knife will extend into the record-surface only a predetermined and set amount, whereby the layer of record material removed will be of-predetermincd thickness,

This improved means, according to the present invention, comprises a gage-bar 27 mounted in a housing 28 for the knife-bar and adapted to slide parallel therewith. The knife-bar 23 and gage-bar 27 are tied together by a yoke or tie-bar 29 for movement en bloc in the housing 28 toward and from the record-surface, so that, when they are moved forwardly toward the recordblank, the front face 30 of the gage will engage the record-surface and limit the extent of forward movement of the knife 24 beyond the record-surface. The knife-bar 23 and the gage-bar 27 and yoke are usually so interconnected and formed that the working surface of the knife 24 usually extends beyond the working surface 30 of the gage-bar 27 by an amount equal to substantially fifteen thousandths of an inch. This, with an additional advance of live thousandths of an inch effected by means hereinafter described, represents the depth of a first or preliminary out.

It is sometimes desirable. however, to change the depth of cut determined by the g i 27, and this is accomplished according to the present invention by providing on the gage 27 a screw-threaded portion 31 adjustable in a threaded section 32 of the lie-bar 2.) connected to the knife-bar 23. These 1 arts are locked in the adjusted position by a threaded disc 33 which preferably has a cupped section 34-. which acts as a linger piece by means of which the gage-bar and the knife-bar are moved toward the record 19.

In adjusting the go r'lJlil' 2 relative to the knife 2i, the disc .5 is first turned to release the screw portion ill and the latter is then turned in the yoke, either to the right or left, until the desired setting is obtained, whereupon the disc 3:?- is turned to lock the gage-bar 27 against movement in the yoke 29. By this means, a person of ordinary mechanical skill can vary iln relation between the gage-bar and the knife-bar so that the depth of cut may be changed to meet prevailing conditions.

The gage-bar, having been set relative to the knife to suit average conditions, these parts are moved from normal inopcrat ive position to a position for taking the first or roughing cut on a record-blank 12) by the operator pressing his finger against the linger-piece 34- carricd by the gagc bar until the flat end 30 of the gage-bar comes in coutact with the recordsurface. at which time the edge of the knife will be located forwardly of the record a predetermined amount.

In making the shaving machine, the gagebar 27 may, of course, be located at cithcr side of the knife-bar 23. depending upon what point in the operation of the machine it is desired to set the knife-bar 2 it is considered preferable, at PltFKlll'. to place the gage-bar 27 behind the knife-bu r Qtlfconsidering the direction of travel of the carriage while the knife is cutting, so tl at the gage-bar end 30 will always be above 5lll l spaced from the record-s1u'face just shaved by the knife 24:. Moreover, when so placed. the gage-bar may be arranged to Contact with the record, when setting the knife. while the knife is located beyond the end of the record at the finish position of cutting travel, as seen in Fig. Hence the knife bar and gage may be moved into positio bv hand as above described. without necessitating the pressing or forcing of the knife .4: into the record-surface, After this setting. the carriage is pivotally moved on the guiderod 13, then slid to starting position for cutting travel at the left side of the machine shown in Fig. 1, so the gage-bar end will trail. the knife 24: and be spaced from the shaved record-surface a distance substantially equivalent the depth of cut taken as the cutter travels over the recordsurface toward the finish positions.

The present invention also provides im proved means for locking the knife-bar 23 ill) in any manually adjusted position so that it will be firmly held in that position while shaving a record. This means, in the form shown in the accompanying drawings, comprises a shaft mounted to rotate in the housing 28 adapted to extend transversely of the knife-bar 23. The shaft 35 is provided with a cam section 36 adapted to engage a flat surface 37 on the bottom of the knifebar 23 so that, when the shaft 35 is rocked by a spring 38 (Fig. 1), the cam section 36 will be brought into engagement with the flat surface 37 on the knife-bar to firmly lock the knife-bar in place. The cam section 36 is so arranged that should the knifebar 23 tend to move backwardly, it would cause the shaft 35 to be rocked, thereby causing the cam 36 to more tightly and firmly engage the knife-bar andprevent its further movement.

In order to advance the knife 24 step-bystep to take finishing cuts, it has previously been proposed to slide the knife-bar and carrier therefor on the carriage to and from the record. It has also been proposed to allow falling movements of the carriage itself stepby-step to accomplish this purpose.

According to the present invention, however, the step-by-step advancement of the knife 24 is accomplished by pivotally moving the knife-bar on the carriage, as distinguished from pivotally moving the knifebar with the carriage. Accordingly, the knife-bar carrier 28 of the present invention is pivotally mounted on a rod 39 carried in a pair of ears 40 and 41 formed integral with the carriage 14 and between which ears the end 42 of the cutter carrier 28 snugly fits. The shaft 39 is arranged parallel to the axis of the mandrel 18 so that when the cutter carrier 28 is rocked on the shaft, the knife 24 will be moved toward or from the record, according to whether the knife-carrier 28 is given a clockwise or counter-clockwise movement, as seen in Fig. 3.

Normally, the knife-bar housing 28 is urged rearwardly, that is to say, away from the mandrel 18, by means of a spring 43 which is located in the carriage 14 and which forces a plunger 44 upwardly against a forwardly extending arm 45 on the cutter-carrier 28. It is against the tension of the spring 43 that the cutter-carrier 28 is ad vanced step-by-step to move the knife 24 closer to the record 19 for successive finishing cuts. v

This step-by-step movement of the cuttercarrier 28 is controlled by a cam disc 46 mounted on a stud 47 on the carriage 14, cooperating with a roller 48 mounted on a stud 49 carried by the arm 50 of the cutter carrier 28. The spring 43 normally urges the knifebar housing 28 rearwardly so that the roller 48 contacts with the surface of the camdisc 46.

The cam disc 46 is provided with a series of ratchet teeth 51 adapted to be engaged by a feed pawl 52 pivotally carried byv a pawlarm 53 pivotally mounted on a stud 54 carried by the carriage 14. The ratchet teeth 51 are also engaged by a back-check pawl 55 pivotally mounted on the stud 54 and normally urged by the weight of its arm 56 into engagement with the ratchet teeth to prevent backward movement of the cam disc 46 against the tension of a spring 57 located in an undercut portion in the stud 58, see Fig. 4.

In order that the cam disc 46, and hence the knife 24, may be moved step-by-step to accommodate for successive finishing cuts as an incident to the movement of the carriage to position to start shaving a. record, the arm 53 of the feed pawl 52 isarranged to overlie a projection 59 on the base plate 10 when the carriage is, as is shown in Fig. 1, in the position at the end of a shaving operation. The parts are so arranged that when the carriage 14 is raised by means of the hand-piece 17 from the positions shown in Figs. 1 and 3 to that shown in Figs. 2 and 4, the lower portion of the pawl arm 53 engages the projection 59 on the frame and causes the pawl 53 to engage a ratchet tooth on the cam disc 46 and move the latter an amount equal to the distance between two teeth, the pawl 52 at this time moving clockwise, as seen in Figs. 1 and 2, against the tension of its spring 60. While the cam disc 46 is being so moved, one of the ratchet teeth thereon passes the backcheck pawl 55 and the latter then prevents the cam disc 46 from rotating backwardly until the desired time.

This upward swinging movement of the carriage 14 is necessary to permit the movement of the carriage to starting position, for by it the feed-nut 21 is removed from the feed-screw shaft 22, as shown in Fig. 4, and the knife 24 and gage 27 are moved away from the record. With the carriage so raised, it is moved longitudinally of the machine toward the other end of the record and, upon reaching that end, it is allowed to descend to cause the knife 24 to engage the record 19 and shave the same.

During the movement of the carriage to starting position, the feed-pawl arm 53 slides off the projection 59 and is returned to its normal position by a spring 61 wrapped around the stud 54 and having one end anchored in the pawl arm 53 while the other end is anchored in the carriage 14.

If the first finishing cut is not su'liicient to provide a satisfactory recording surface on the record, additional finishing cuts may be obtained by again raising the carriage 14 and moving it to starting position. Thus, without making any manual readjustments of the knife, the automatic advancing means, comprising the feed-pawl 52 and cam disk 46 above referred to, will advance the knife by moving the knife-carrier 28 arcuately toward the record during the raising of the carriage.

After the record has been satisfactorily shaved, it is desired to return the knife 24 and knife-bar carrier 28 with the step-bystep advancing means, comprising the cam disc 16, to normal position so that the knife may be manually set to take a first or preparatory cut from a new record. To do this, the shaft 35, which has the cam surface 36 which locks the knife-bar 23 in the knifebar housing 28 against movement, is provided with a lever 62 secured thereto and adapted to be manually operated to rotate the shaft against the tension of the spring 38 to thus release the knife-bar 23. When so released, the knife-bar 23 is restored to inoperative position by means of a spring 63 located in the housing 28 between the housing and a collar 64 on the gage-bar 27 At the same time, the knife-advancing cam disc 46 is released so as to permit its return by the spring 57 (see Fig. 4) by causing the back-check pawl to be disengaged from the ratchet teeth 51.

This is accomplished without requiring attention 011 the part of the operator by providing a connection between the weight arm 56 of the baclncheck pawl and an arm on the knife-bar lock lever 62, comprising a lug 66 on the weight lever 56 of the back-check pawl adapted to extend into an aperture 67 on the knife-release lever constituting this connection. Hence, when the knife-release lever 62 rotates with the shaft 35, the arm 65 thereon will raise the arm 56 of the back check pawl lever 55 and remove the pawl from engagement with the ratchet teeth. By this operation, the cam disc 46 is permitted to be returned to normal or initial position by the spring 57, because the feed pawl 52 is normally out of engagement with the ratchet teeth 51. When the cam disc 46 is returned to normal or initial position, it allows the knife-housing 28 to be swung to its normal or initial position by means of the spring 43 provided for the purpose. The extremes of movement of the cam disc 46 is limited in both directions by a stop pin 68 engaging shoulders 69 on the cam disc.

The preparatory pivotal upward movement of the carriage 14, when moving the carriage to position to start shaving, is limited according to this invention by an arm 70 mounted on the carriage engaging a rail 71 provided on the base 10. The movement permitted by the arm 70 and rail 71 is, of course, more than sufficient to move the knife-bar out of engagement with the record and the feed-nut 21 out of engagement with the feedscrew 20, but it is just sufficient to move the knife-advancing means the proper or requisite amount.

In order to insure that the carriage is raised sufficiently high to move the knife-advancing means the proper amount, the present invention provides a pair of escapement lugs 72 and 73, the lug 72 being mounted on the carriage 14 and the lug 73 being mounted on the frame 10. These lugs are normally arranged to be in the relative positions shown in Figs. 1 and 3 when the carriage is at the end of a shaving operation. In this position, the lug 72 is beyond the lug 73 and hence the carriage may be swung upwardly without interference with the lug 7?). Should the carriage be swung up partially. however, and not far enough to operate the knife-advancing means, the lug 72 will be in position to be engaged by the lug 73 should an attempt be made to move the carriage longitudinally. However, if the carriage is moved sul'iiciently, the lug 7 2 is carried forwardly beyond the lug 73 as shown in Fig. 4, and in this position longitudinal movement of the carriage is permitted.

It will be understood that the relative setting of the knife-bar 23 and the gage-bar 27 is such that the amount of the lirst cut will be the sum of the amount by which the knife-bar protrudes beyond the ga e-bar and the amount of advancement given to the knife by the means for advancing the knife for a secondary cut, for the automatic knifeadvancing means operates when the carriage 14 is first raised after setting the knife by hand as well as during subsequent raising movements of the carriage as when taking successive finishing cuts.

Variations and modifications may be made within the scope of this invention and pertions of the improvements may be used without others.

Having now described the invention, what is claimed as new and for which it is desired to obtain Letters Patent. is

1. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage; a toolcarrier pivotally mounted on the carriage; an intercmneeted recm'd-engaging tool and gage mounted in the tool-carrier; and self-tightening means for locking the recordengaging tool in desired relationship with the record.

2. In a record-resurfacing machine. the combination of a mandrel for supporting a record to be resurfaced: a carriage; a eultercarrier pivotally mounted on the carriage: a cutting tool; a gage interconnected with the tool to predetermine the depth of cut of the tool; and means for adjustably varying the depth of cut determined by said gage.

3. In a record-resm'facing n'mchine. the combination of a mandrel for supporting a record to be resurfaced: a carriage: a toolcarrier; a record-engaging tool and a gage interconnected and supported in the tool-carrier, said tool-carrier being pivotallv mounted on the carriage for arcuate movement toward and from a record supported by the mandrel; and automatic means operable While the carriage is located at the end of its travel for pivotally moving the tool-carrier to advance the record-engaging tool to position to perform a finishing operation on the record.

a. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced a carriage, a cuttercarrier; a record-cutting tool and a depthof-cut interconnected and supported by the cutter-carrier, the latter being mounted on the carriage for arcuate movementtoward and from a record supported on the mandrel; and automatic means operable While the carriage is located at the end of its travel after taking a cut of predetermined depth for moving the cutter-carrier arcuately to advance the record-cutting tool to position to take a finishing cut of predetermined depth.

5. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage mounted for movement to carriage-returning position; a record-engaging tool mounted on the carriage; means operable as an incident to the movement of the carriage to carriage-returning position While the carriage is located at the end of its travel for advancing the recordengaging tool to a position to take a cut of predetermined depth; and means necessitating the completion of the movement of the carriage to carriage-returning position before the carriage is permitted to return to position to start said out of predetermined depth.

6. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage mounted for pivotal movement; a record-cutting tool mounted on the carriage; means operated as an incident to the pivotal movement of the carriage While the carriage is located at the end of its travel for advancing the recordcutting tool to a position to take a cut of predetermined depth; and means preventing re turn of the carriage to position to start said out of predetermined depth until the completion of the pivotal movement of the car riage is sufficient to cause advancement of the record-cutting tool.

7. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage mounted for pivotal movement; a record-cutting tool mountec on the carriage; means operated as an incident to the pivotal movement of the carriage While the carriage is located at the end of its travel for advancing the recordcutting tool to a position to take a cut of predetermined depth; and a blocking arm mounted in position to be engaged by the carriage to block its returning movement until the carriage has been pivotally moved sutlieientiy far cause the of the means for advancing the record-cutting tool.

8. In a record-resurfacing machine, the combination of a frame; a mandrel for supporting a record to be resurfaced; a carriage mounted on the frame for pivotal movement; a record-cutting tool mounted on the carriage; means operated as an incident to the pivotal movement of the carriage While the carriage is located at the end of its travel for advancing the record-cutting tool to a position to take a cut of predetermined depth; and cooperating means mounted on the carriage and mounted on the machine and adapted to prevent longitudinal movement of the carriage in returning direction from the said end of its travel until When the carriage has been pivotally moved sufficiently far to operate said means for advancing the record-cutting tool.

9. In a record-resurfacing machine, the

combination of a mandrel for supporting a record to be resurfaced; a carriage; a cut-tercarrier pivotally mounted on the carriage; means for arcuately feeding the cutter-carrier toward the side of the record incidental to the movement of the carriage to position for starting a new or finishing cut; manually operable means for freeing the cutter-carrier to return to normal position and means for returning the cutter-carrier to normal position incident to the release of said manually operable means. i

10. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage; a toolcarrier pivotally mounted on the carriage; a record-engaging tool; means for positively locking the record-engaging tool in the pivotally mounted tool-carrier; automatic means for pivotally advancing the tool-oarrier toward the record for successive finishing cuts incident to the movement of the car riage from finishing position of travel to the starting position of travel; and means for simultaneously returning the record-engaging tool, the tool-carrier, and the tool-carrier advancing means to normal positions by the release of said means for locking the recordengaging tool.

11. In a recorderesurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage; a toolcarrier pivotally mounted on the carriage; a

"record-engaging tool; manually operable means for locking the record-engaging tool With relation to the record being resurfaced; means for advancing the tool-carrier toward the side of the record for successive finishing cuts; and means for simultaneously accomplishing the return of the record-engaging tool, the tool-carrier, and the tool-carrier advancing means to normal positions by the release of said manually operable means, said neane' operable in any position of the pivotally mounted tool-carrier on the carriage.

12. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage; a tool carrier pivotally mounted on the carriage; and a record-engaging tool and depth-of-cut gage slidably mounted in the pivotally mounted tool-carrier for simultaneous move ment toward and from the record.

13. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a carriage; a cuttercarrier pivotally mounted on the carriage; a cutter-carrier feeding mechanism comprising a cam and ratchet wheel segment on the car riage for arcuately advancing the cutter-can rier toward the side of the record; and a roller mounted on the cutter-carrier contacting and turning with the movement of the cam surface of the cam and ratchet wheel segment.

14. In a record-resurfacing machine, the combination of a mandrel for supporting a record to be resurfaced; a top plate; a carriage pivotally mounted on the top plate; a cutter-carrier pivotally mounted on the can riage; and a cutter-carrier feed means comprising a cam and ratchet wheel segment actuated by a pawl, the said pawl being mounted on a plate which engages the top of a boss on the top plate when the carriage is pivotally moved, this movement of said means causing the pawl to engage the ratchet wheel segment and advance one step of the cam and ratchet wheel segment, and causes the arcuate movement of the cutter-carrier toward the record.

15. In a record-resurfacing machine, the combination of a mandrel for supporting a record to'be resurfaced; a carriage; a toolcarrier pivotally mounted on the -arriage; a record-engaging tool mounted on said toolcarrier; means for locking the record-engaging tool against movement in the tool-carrier; feeding means for the tool-carrier comprising a cam and a ratchet wheel segment to pivotally move the tool earrier SlLP-lJX-Sitll) toward the record; back-check means to engage the teeth on the ratchet-wheel segment to hold it in the position to which it is moved; and means coupling the tool-locking means and the back-check means for simultaneous release to allow the return to normal position of the tool, the tool-carrier and the tool feed means when the tool-locking means is released, said coupling being loose to permit the operation of the back-check means when the feed-means is actuated and independently of the tool-loeking means.

Signed at Bridgeport, in the county of Fairfield, and State of Connecticut, this 26th day of July, 1927.

JOHN E. RENHOLDT.

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