US680189A - Press for leather-cutting, &c. - Google Patents

Description

No. 680,I89. Patented Aug. 6, |90I.

A. G. BREWER. PRESS FOR LEATHER CUTTING, &c.

(Applicationled Dec, 13, 1900. n (No Model.) 2 Sheets-Sheet 1.

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A. G. BREWER.

Patented Aug. s, |901.

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(Applcationled Dec. 13, 1900.

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UNITED STATES PATENT EEICE.

`ALBERT G. BREVER, OF HOPKINTON, MASSACHUSETTS.

PRESS FoR LEATHER-CUTTING, sto.

SPECIFICATION forming* part Of Letters Patent NO. 680,189, dated August 6, 1901. Application filed December 13, 1900. Serial No. 39,728- (No modal.)

To a/ZZ whom it may concern:

Be it known that I, ALBERT G. BREWER, of Hopkinton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Presses for Leather-Cuttin g, &c. of which the following is a specification.

This invention relates to presses in general and is herein illustrated in connection with a leather-cutting die-press.

One object of the invention is to provide for imparting a single stroke only to the movable press member when a treadle or other operating member is depressed, and a further obj ect is to provide for a relatively quick movement of clearance or initial projecting movement of the press member and a relatively slow movement of pressure with increased power.

Of the accompanying drawings, forminga part o`f this specification, Figure 1 represents a front elevation, partly in section, of a leather-cutting'die-press provided with my improvement. Figs. 2 and 3 represent vertical sectional views thereof, showing dierent positions of the operating parts.

The same reference characters indicate the same parts in all the iigures.

1 is a frame having a fixed upper cross-head 2, guide-rods 3 for a sliding cross-head 4, and bearings for a drive-shaft 5, which is continuously rotated. The moving cross-head 4 carries a die-block 50, upon the upper surface of which the leather to be died out is placed, the die 6 being interposed between the leather and the fixed cross-head l2 and acting to cut or die out the leather when the movable crosshead is elevated into its position of pressure. On the shaft is fixed a pair of eccentrics 7 7, which revolve continuously with said shaft, said eccentrics being provided with straps 8, having arms 9, Whose upper ends are connected by a rod 10, guided in vertical slots 11 on the machine-frame.

12 represents downwardly-reaching 4arms iixed to the movable cross-head 4 and having lugs 13, guided in vertical slots 14in the machine-frame.

15 15 are a pair of toggles interposed between the arms 9 and 12,I the lower ends of the toggle-arms 16 being connected by a rod 17, guided in the slots 11, and the upper ends of the upper toggle-arms 18 being connected by a rod 19, guided in the slots 14. When the toggles 15 are set or straightened, as shown in Fig. 3, they form a motion-transmitting connection between theeccentrics 7 and the cross-head 4, and their knuckles are then located slightly past a central position and guided by vertical guide-plates, one of which is shown at 20 in Fig. 1. When the toggles are broken, as indicated 'in Fig. 2, they are inoperative as motion-transmitting connections, their knuckles being merely oscillated laterally by the vertical reciprocatiqn of the arms 9. The arms 12 are connected with the upper toggle-arms 18 by means of links 21 21 in order to support the upper ends of the toggles; but such connection is not necessary between the eccentric arms 19 and the lower toggle-arms 16, since the latter tend to fall by gravity.

22 is a slide mounted for vertical movement in fixed bearings 23 24 on the machine-frame and actuated by a treadle 25 through connections including a lever 26 and link 27. The

-treadle is normally elevated to depress the slide by means of a spring 28.'`

29 is a latch pivoted at 30 to the slide 22, and 31 is a coacting projection on the rod 19, which connects the upper ends of the upper toggle-arms 18. The latch 29 isV normally projected into position to engage the projection 31 during the vertical movement of the slide 22 by means of a spring 32, its movement in this direction being limited by a stop 33 on the latch engaging the slide.

34 is a fixed plate having a slot 35, through which an arm 36 on the lower end of the latch 29 projects. A pair of ixed cam-abutments 37 on the machine-frame and a coacting pair of cam-abutments 38 on the lower toggle-arms 18, near the knuckles of the toggles, are provided for breaking the toggles when the latter descend after the completion of the operativemovement of the cross-head.

39 represents springs adapted to partl counterbalance the weight of the cross-head I 4 and connections, said springs surrounding rods 40, attached to the lugs 13 on thexarms 12, the rods being guided in tixedbearings` 42 and having adjustable collars 41, between IOO terposed.

The operation is as follows: The positionv of rest of the machine is with the cross-head 4 depressed and the toggles 15 broken. The operator having fixed his leather and die on the die-block 50,hedepresses the treadle 25 and elevates the slide 22. In the upward movement of the slide its latch 29 engages the projection 31, and thereby elevates the crosshead 4, at the same time straightening the toggles 15. This initial movement of the cross-head is a relatively quick movement to overcome the clearance-space between the fixed cross-head 2 and the die 6. having assumed their motion-transmitting position, the eccentrics 7 then act through them upon the cross-head 4 and impart to said cross-head its final relatively slow movement of pressure, whereby the cutting edge of the die is forced through the leather, this final movement, owing to the action of the eccentrics, being one of increased power. At the termination of the upward movement of the slide 22 the arm 36 on its latch 29 comes in contact with theupper end of the slot 35 in the fixed plate 34 and throws the latch out ot' the path of the projection 3l, so that during the downward movement of the toggle said projection will not encounter the latch. This retraction of the latch is very desirable, inasmuch as the operator would have great difficulty in releasing the treadle quickly enough todepress the slide 22 before the cross-head had descended. With the described provisions for retracting the latch, however, the operator has merely to complete the stroke of the treadle and may keep the.

treadle depressed until he desires to release it. Upon the descent of the cross-head the cam-abutments 38 encounter the complemental abutments 37 and automatically break the toggles, so that another upward stroke of the cross-head upon the next revolution of the eccentrics is prevented.

I do not confine myself to the exact features of construction herein set forth, as these may be variously modiied without departing from the spirit of -my invention.

I claimi 1. In a press, a press member, a continuously-moving actuator,a motion-transmitting connection between said press member and` actuator, adapted to assume an operative or an lnoperative position, a controller having provisions for rendering said-connection operative when moved in a certain manner, and means automatically actuated through a continuation of said movement of thecontroller for rendering its provisions inoperative.

2. In a press, a press member, a continuously-moving actuator,a toggle adapted, when set, to form a motion-transmitting connection between said actuator and press member and rendered inoperative when broken, a controller having provisions for setting the tog- The togglesgle when moved in a certain manner, and means automatically actuated through said movement of the controller for rendering its said provisions inoperative, after the toggle has been set.

3. In a press, a press member, a continuously-movingactuator,a toggle adapted,when set, to forma motion-transmitting connection `between said actuator and press member and rendered inoperative when broken, a 'controller having a latch adapted to engage and set the toggle during the movement of the controller in a certain manner, and means automatically actuated through said movement of vthe controller for retractin g the latch from operative position after the toggle has been set.

4. In a press, a press member, a continuously-moving actuator and a controller, both adapted to project the press member, a toggle interposed between the actuator and press member and adapted to be set by the controller, said toggle when set forming a motiontransmitting connection between the actuator and press member, coacting devices on the controller and toggle whereby the controller engages and sets the toggle and thereby projects the press member, and means automatically actuated during the projecting movement of the press member for throwing one of said devices out of the path of the other.

5. In a press, a press member, a continuously-moving actuator,a toggle adapted,when set, to form a motion-transmitting connection between said actuator and press member and rendered inoperative when broken, a slide having a latch adapted to engage and set the toggle, and a fixed abutment adapted to engage and retract the latch during a continuation of the toggle-setting lmovement of the slide. 6. In a press, a press member, a continuously-movin g actuator,a toggle adapted,when set, to form a motion-transmitting connection between said actuator and press member and rendered inoperative when broken ,provisions under control of the operator for setting the toggle, and means actuated automatically through the retracting movement of the toggle for breaking the toggle.

7. In a press, a press member, a continu .Ously-revolved eccentric, a toggle adapted, when set, to form a motion-transmitting connection between the eccentric and press member and rendered inoperative when broken, a controller adapted to set the toggle and impart a relatively quickinitial projecting movement to the press member, the eccentric imparting to said member a relatively slow final projecting movement, and means actuated automatically through the retracting movement of the toggle for breaking the toggle.

8. In a press, a press member, a continuously-moving actuator adapted to impart a relatively slow movement of pressure to said press member, a device under control of the operator for imparting a relatively quick tog movement of clearance to said member, a mo- Y In testimony whereof I have affixed my sig tion -transmitting mechanism intermediate nature in presence of two witnesses. between the actuator and press member and ALBERT G BREWER adapted to be set by said device, and means actuatedantomatically through the retracting Witnesses movement of the mechanism for throwing R. M. PIERSON, said mechanism out of action. M. B. MAY.

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