US2121716A - Leather cutting machine - Google Patents

Description

June 21, 1938. 'w. c. SHIELDS 2 ,7

- LEATHER CUTTING MACHINE Filed 000. 15, 1936 4 Sheets-Sheet 1 K K r l mu 2; am a. ,sz g/ ggs wwr a.

ATTORNEY 3e 21, as.

W. c. SHIELDS 2,123,716

- LEATHER CUTTING MACHINE Filed Oct. 15, 1.936 4 Sheets-Sheet 2 INVENTOR I ATTORNEY mam dfi hielda June 21, 19%. W Q SHIELDS 2,121,715

LEATHER CUTTING MACHINE Filed Oct. 15, 1936 4 Sheets-Sheet 3 ATTORNEY June 2% 393%, Q s g s. 2321,7116

- LEATHER cu'rzcme MACHINE Filed Oct. 15, 1956 4 Sheets-Sheet 4 Patented June 21, 1938 UNIT El) STAT ES n ps m nt 2,121,716 I I LEATHER Cmmemcma William 0. Shields, BombayyN Y. Application October 15, 193 Serial Nam-5, 06?

1 Claim. (01.- 164-23) This invention relates to leather cutting machines operable either pneumatically, hydraulically or electrically and has for the primary object the provision of a device of this character whereby the cutting of the work is by pressure so as to operate witha minimum amount of Vibration and with efiiciency and rapidity and is so constructed that the presser may be easily and quickly moved laterally of the work holder to permit work and cutting dies to be placed on and removed from the holder and the latter being so arranged that it may be easily adjusted to accommodate work of different thicknesses.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a front elevation illustrating a leather cutting machine constructed in accordance with my invention.

Figure 2 is a top plan view illustrating the device.

Figure 3 is a vertical sectional view illustrating the device.

Figure 4 is a horizontal sectional view taken on the line 4-4 of Figure 3.

Figure 5 is a fragmentary vertical sectional view illustrating the operation of the device by electrical means.

Figure 6 is a fragmentary front elevation showing said electrical operating means.

Referring in detail to the drawings, the numeral I indicates a base or bed having rising therefrom a supporting structure 2 of hollow formation terminating at its upper portion in a horizontally disposed arm 3 forming a support for a vertically arranged bearing 4 of the sleeve type. The supporting structure 2 also carries a lower sleeve type bearing 5 arranged in vertical alignment with the bearing 4. The bearings 4 and 5 slidably support a vertical shaft 6 to which is adjustably secured a horizontally arranged presser l. The presser 1 besides being adjustable vertically on the shaft 6 is free to rotate on said shaft, a bearing 8 being provided to permit free rotation of the presser. The presser 1 is preferably of hollow formation havinga die engaging face I!) and is strengthened by reinforcing ribs II.

' The supporting structure 2 has slidably mounted thereon a work support l2 including a removable block l3 disposedhorizontally for supporting the'work to be acted upon by the presser. Tie bolts I4; are employed'for detachably securingtheblocklfi'to the support l2." The block l3 may be constructed of wood "or an'y con'iposition of material". The worksupport l2 is"mounted also upon hand operated adjusting members I5 carried by the base I. The hand operated adjusting members l5 permit the work support to be leveled and to be raised and lowered. The supporting structure includes a curved rest l6 acting as a stop for limiting the downward movement of the heel portion i! of the presser. Suitable lubricating means IB is provided for the shaft 6 and the journal of the presser.

The supporting structure 2 carries a bracket l9 to which is pivoted a lever 20, one end of which is pivotally and detachably connected to the lower end of the shaft 6. The other end of said lever is pivoted to a link 2!. The link 2| is pivoted to a link 22 which is in turn pivoted to the supporting structure 2. The pivotal connection between the links 21 and 22 is indicated by the character 23 and connects to a head 24. The head 24 is disposed horizontally and is connected to a piston stem 25 of a piston 25 operating in a horizontally arranged cylinder 21. The cylinder is suitably attached to the supporting structure 2 and opposite ends thereof are connected to pipes 28 and 29. The pipes 28 and 29 are connected to a conventional type of two-way control valve 39 mounted on the presser l. The pipes have flexible connection with the control valve so that the presser may swing horizontally in either direction or move vertically. A supply pipe 3| is connected to the control valve and to a pressure supply source (not shown). The pipe 3| has a flexible connection with the valve. The valve 30 may be operated in its different positions by a control lever 32 mounted on the pressser. The valve 3!] is adapted to admit pressure to either end of the cylinder to act on the piston for operating the latter in either direction for the purpose of raising and lowering the presser through the links 22 and 2| and lever 20 connected to the shaft 6.

In operation, leather or similar work is placed upon the block l3 and the die (not shown) placed upon the work. The control valve 30 is then actuated to admit pressure to the left hand end of the cylinder forcing the piston 26 to the right drawing the presser downwardly, bringing about severance of the Work by the die. A reverse operation Of the valve 30 causes a reverse movement of the piston raising the presser so that the work may be removed along with the die.

The rear portion of the supporting structure has a hand opening closed by a removable cover 33. The pressure admitted to the cylinder may be either pneumatic or hydraulic.

After the work support has been adjusted vertically by the adjusting members it may be secured in its adjusted position by stud bolts 35.

While I have described the presser as being operated either pneumatically or hydraulically, said presser may be successfully operated electrically by substituting a bell crank lever 31 for the link 22 and eliminating the head 24, cylinder 2'! and. all parts associated therewith. The bell crank lever 31 is pivoted to the base or stand, as shown in Figure 5, and has an electric solenoid 38 connected thereto. The electric solenoid is mounted on the base or stand in lieu of the cylinder 21 and its control may be in any conventional way. When the solenoid is energized itbrings about pivotal movement of the bell crank lever and the latter in turn rocks the lever 20, lowering the presser. A spring is connected to the pivot 23 and acts to restore the presser to its uppermost position when the solenoid is deenergized.

Having described the invention, I claim:

A leather cutting machine comprising a supporting structure including a hollow portion, vertically arranged bearings carried by said supporting structure, a shaft slidably supported by said bearings, a horizontally disposed work holder mounted on said supporting structure and having a vertical adjustment thereto and said supporting structure including an integrally formed extended portion arranged on the opposite side of the shaft from the Work holder to provide a rest, a horizontally disposed presser journaled on the shaft and held against end- Wise movement thereon and including a heel portion to contact the rest for limiting the downward movement of the presser and to positively preclude further downward movement of the presser relative to said work holder when said heel portion contacts said rest, linkage mounted in the hollow portion of the supporting structure and connected to the shaft, and a manually controlled power means connected to said linkage.

WILLIAM C. SHIELDS.

Images