US1142157A - Back-rest and back-gage or welt-guide mechanism. - Google Patents

Description

A. EPPLER.

BACK REST AND BACK GAGE 0R WELT GUIDE MECHANISM.

APPLlCATION FILED MAR. 11, I912.

Patented June 8, 1915.

3 SHEETS-SHEET 1.

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Jmmsmiar w M am a A. EPPLER. BACK REST AND BACK GAGE 0R WELT GUIDE MECHANISM.

APPLICATION FILED MAR'. 11, 1912.

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BACK REST AND BACK GAGE 0R WELT GUIDE MECHANISM.

APPLICATION FILED MAR. H. 1912. 1,142,157. Patented June 8,1915.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

ANDREW EPPLER, OF LYNN, MASSACHUSETTS, ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

BACK-BEST AND BACK-GAGE 0R WELT-GUIDE MECHANISM.

Patented June 8, 1915.

Original application filed August 8, 1908, Serial No. 447,542. Divided and this application filed March 11, 1912. Serial No. 683,087.

To all whom it may concern:

Be it known that I, ANDREW EPPLER, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massachusetts, have invented certain Improvements in Back-Rest and Back-Gage or Welt-Guide Mechanisms, of which the following description, in connection with the accompanying drawings, is a ecification, like reference characters on the rawings indicating like parts in the several figures.

The present invention relates to welt shoe sewing machines and more particularly to im rovements in back rest and back gage or we t guide mechanisms for such machines.

An object of the invention is to produce an improved mechanism for yieldingly supporting the back rest slide which is lighter and quicker acting than the construction heretofore employed and in which the force by which the slide is supported may be readily adjusted but which is unchanged by the movement of the back rest.

A further object of the invention is to produce an improved mechanism for locking the back rest and welt guide slides in their forward positions which is strong and durable and which acts with certainty to lock the slides precisely in the positions to which the are moved.

till another object of the invention is to produce an improved mechanism for actuating the welt guide slide by which the welt guide can be retracted accurately and with certainty to the desired extent during each cycle of operations of the machine.

With the above objects in view further features of the invention consist of certain constructions, arrangements and combinations of parts, the advantages of which will be obvious to one skilled in the art from the following description.

In the accompanying drawings illustrating the invention in the best form at present known to the inventor, Figure 1 is a view in front elevation of a portion of a welt sewing machine embodying the invention; Fig. 2 is a view in side elevation of the mechanism illustrated in Fig. 1; Fig. 3 is a view in side elevation of the machine looking from the left; Fig. 4 is a detail sectional plan view illustrating particularly the back rest slide and its actuating arm Fig. 5 is a detail view illustrating in side elevation the mechanism for retractin the Welt guide slide and also illustrating in dotted lines the clutch mr chanism for locking both the welt guide slide and the back rest slide; 6,

lie

is a detail sectional view taken on the 6 6 of Fig. 5; and Fi 7 is a detail sectional view taken on the fine 77 of Fig. 5.

The machine illustrated in the drawings is provided with a curved hook needle, a needle ide, a loo er, a thread arm, a takeup, a c annel gui a welt guide, a back rest, back rest and welt guide slides, and a tension device, all having the same construction, arrangement and mode of operation as the corres ondin parts of the welt sewing machine disclose in the applicants pending appl1cat1on, Ser. No. 447,542, filed Aug. 8, 1 )0 8, of which the present application is a division. For a full and complete description of the parts not fully described herein, reference may be had to said application.

The welt guide in the machine illustrated in the drawings is indicated at 1. In order that the groove of the welt may be brought into the path of the needle regardles of the thickness of the .material being operated upon, the welt guide is mounted so that it moves toward and from the shoe in a path of greater radius than that of the needle but in a path which is substantially tangent to that of the needle at the oint where the welt guide engages the W0 In the construction illustrated in the drawings this result is secured by mounting the welt ide upon the welt guide carryin arm 2 an pivoting this arm in front 0 and above the needle substantially diametrically opposite the point at which the welt guide engages the work. By so mounting the welt guide, it moves toward and from the work in a path of greater radius than that of the needle, so that it engages the lasting tacks laterally and bends t em over, instead of resting upon the heads of the tee When in close proximity to the shoe, however, the welt guide is movin in substantially the same path as the nee 1e, so that the groove in the welt is not displaced to any appreciable extent by variations in the thickness of the material operated upon. The welt guide is moved toward and from the shoe at the proper times during the operation of the machme lfi means of a link 3, a welt guide slide 4 whi is connected with the welt guide carrying arm 2 by the link 3, a spring which acts to force the welt guide slide forward, and a cam actuated clutch mechanism which retracts the slide. The spring for forcing the welt guide slide forward is indicated at 5. This s ring is coiled around a stud 6 provided wit an adjustable cap disk 7 to, which one end of the spring is secured. The other end of the spring extends upwardly and bears against a pin 8 projecting from the welt guide slide. The cam actuated clutch mechanism for retracting the slide comprises a clutch box 9 surrounding the slide, and provided with inclines between which and the edges of the slide, clutch rolls 10 are located. Golled springs 11 seated in recesses in the clutch box act upon the rolls and tend to hold them in clutching position against the inclines and the adjacent sides of the slide. The inclines on the clutch boxare so arran ed that durin the rearward movement of t e clutch box t e slide is gripped by the clutch rolls and the slide is retracted. For actuating the clutch box a cam actuated lever 12 is rovided, the lower end of which is connected with the clutch box by a link 13. To positively release the welt guide slide from the clutch rolls 10 during the forward movement of the clutch box, and preferably before the welt guide contacts with the shoe, stationary pins 14 are provided which enter holes in the clutch box as it reaches the limit of its forward movement, and positively force the clutch rolls 10 backwardly against the tension of the springs 11.

It is customary in welt shoe sewing machines to provide means for adjusting the welt guide on its carrier toward and from the path of the needle,

so as to bring the groovesof different styles of welt into proper position. To secure this result, the welt guide of the machine illustrated in the drawings is secured to its carrying arm by means of a pivot pin 15 passing through a slot in the arm, and by a stud 16 passing through the arm and provided with an eccentric portion engaging the welt guide.

The back rest of the machine illustrated in the drawings is indicated at 17, and the back rest slide at 18, these parts being constructed and arranged as in prior machines. An improved mechanism for yieldingly supporting the back rest slide is, however, provided, which mechanism is much lighter and quicker acting than the construction commonly used, which comprises a rack and pinion and a clock spring. Another advantage of this improved mechanism is that it permits the use of a spring which can be easily adjusted, and a spring of such length that the movement of the back rest does not 'appreciably change the tension of the spring. This mechanism for yieldingly supporting the back rest comprises a horizontal arm 19, the free end of which enters a'slot in the back rest and engages a roller 20 mounted therein, and the other end of which is pivotally mounted upon avertical pivot 21.

long coiled spring 22 surrounds the pivot 21, and is connected at its lower end to the arm 19, and at its upper end to a plate or disk 23 secured to the upper end of the pivot, so as to be capable of adjustment to vary the ten: sion of the spring. The disk 23 is secured in adjusted position by a clamping screw 24 passing through the disk and screwing into the pivot. The back rest is intermittently locked against backward movement by mechanism hereinafter described.

To lock the back rest slide 18 and the welt guide slide 4 in their forward positions at the proper times during the operation of the machine, the machine illustrated in the drawings is provided with an improved mechanism which is strong and durable, and which acts with certainty to lock the slides precisely in the positions to which they are moved while the slides are unlocked. This mechanism comprises clutch rolls which are arranged to engage suitable friction surfaces on the slides, and which are supported by inclines on a member which is movable from a position in which the rolls are out of engagement with the slides to a position in which the rolls are clutched between the slides and the inclines on the movable memher. These clutch rolls, together with their supporting member, constitute friction clutches which are extremely sensitive in operation, and which look the slides se curely in position without liability of any lost motion or any derangement or breakage of the parts. The clutch rolls are indicated at 25 and 26, and are arranged to engage respectively the lower and upper sides of the welt guide and back rest slides. The rolls are arranged in the same vertical plane and are fitted loosely in vertical slots in the frame of the machine. The supporting member for the rolls is in the form of a wedge indicated at 27, one incline surface of the wedge engaging one roll and the other incline surface engaging the other roll. The wedge 27 is pivotally connected at its rear end to the vertical arm of a bell crank lever 28, the horizontal arm of which is provided with a roll'engaging a cam on the cam shaft; The bell crank lever is actuated by the cam to withdraw the wedge to unlock the slides and the wedge is moved in a direction to lock the slides by means of a coiled spring 29 connected at one end to the frame of the machine, and at the other end to the bell crank lever 28.

The machine illustrated in the drawings, while adapted for welted work, can also be used for turned shoes, a suitable back gage of usual construction being substituted for the welt guide, as will be readily understood by those skilled in the art. In such case, the

slide 4. will be a back gage slide instead of a welt guide slide, and in fact the slide of welt sewing machines corresponding to the slide 4 of the machine illustrated in the drawings is often termed a back gage slide. Accordingly, in certain of the claims the term back gage slide is used to designate the slide 4.

The invention is not limited to the details of construction, arrangement and mode of operation of the illustrated embodiment but may be embodied in other forms within the scope of the claims.

Having explained the nature and object of the invention and having specifically de scribed one form of the mechanism in which it may be embodied, what is claimed is:

1. An inseam shoe sewing machine having, in combination, a Work rest slide movable toward and from the shoe, a clutch roll for locking the slide against backward movement, a supporting member for the roll, and means for actuating said member to lock the slide against backward movement and unlock the slide.

2. An inseam shoe sewing machine having, in combination, a work rest slide movable toward and from the shoe provided with a longitudinal friction surface, a clutch roll to engage said surface and lock the slide against backward movement, and mechanism cooperating with the roll to lock the slide against backward movement and unlock the slide.

3. {in inseam sewing machine having, in combination, a work rest slide movable toward and'-.from the shoe provided with a longitudinal friction surface, a locking mechanism comprising a clutch roll engaglng said surface and locking the slide against backward movement, a nember provided with a surface engaging and supporting the roll inclined to said friction surface, and means for moving said member to release the roll and the slide intermittently in the operation of the sewing machine.

4. An inseam sewing machine having, in combination, a back gage slide, a back rest slide, clutch rolls for locking the slides, supporting members for the rolls, and means for actuating said members to lock and unlock the slides.

5. An inseam sewing machine having, in combination, a back gage slide and a back rest slide provided with" longitudinal friction surfaces, clutch rolls to engage said surfaces, and mechanism cooperating with the rolls to lock and unlock said slides.

6. An inseam shoe sewing machine having, in combination, stitch forming devices,

a back rest, a back rest slide, an arm located in a horizontal plane having one end in engagement with the slide and the other end mounted to turn about a vertical axis, and an actuating spring coiled around the axis of the arm and acting on the arm'to impart forward movement to the slide.

7. An inseam shoe sewing machine having, in combination, stitch forming devices, a back rest slide, a back gage slide, a clutch roll for locking each slide, a wedge movable between the rolls, and means for actuating the wedge to lock and unlock the slides.

8. An inseam shoe sewing machine having, in combination, stitch forming devices including a curved hook needle, a back gage slide, and mechanism for retracting said slide comprising a clutch box surrounding the slide and provided with roll-clutching inclines, clutch rolls mounted in the box and arranged to be gripped between the inclines and the slide, mechanism for reciprocating the clutch box to retract the slide, a spring for advancing the slide, and fixed stops to engage the rolls during the return movement of the clutch box.

9. An inseam shoe sewing machine having, in combination, a back gage slide and a back rest slide provided with longitudinal friction surfaces, friction clutch members to engage said surfaces, and a wedge movable into a position between said clutch members to lock said slides.

10. An inseam shoe sewing machine, having, in combination, stitch forming devices, a back rest slide, a back gage slide, clutch members to engage and lock the slides, a wedge movable between the clutch members to actuate said members to lock the slides, and means for actuating the wedge to lock and unlock the slides.

11. An inseam shoe sewing machine, having, in combination, stitch forming devices, a back rest slide, a back gage slide, clutch members to engage and lock the slides, a wedge movable between the clutch members to actuate said members to lock the slides, and means for actuating the wedge including a cam for moving the wedge to unlock the slides and a spring for moving the wedge to lock the slides.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ANDREW EPPLER.

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